nsz Git - cparser/blob - parser.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <stdarg.h>
  24 #include <stdbool.h>
  25
  26 #include "parser.h"
  27 #include "diagnostic.h"
  28 #include "format_check.h"
  29 #include "lexer.h"
  30 #include "symbol_t.h"
  31 #include "token_t.h"
  32 #include "types.h"
  33 #include "type_t.h"
  34 #include "type_hash.h"
  35 #include "ast_t.h"
  36 #include "entity_t.h"
  37 #include "attribute_t.h"
  38 #include "lang_features.h"
  39 #include "walk_statements.h"
  40 #include "warning.h"
  41 #include "adt/bitfiddle.h"
  42 #include "adt/error.h"
  43 #include "adt/array.h"
  44
  45 //#define PRINT_TOKENS
  46 #define MAX_LOOKAHEAD 1
  47
  48 typedef struct {
  49         entity_t           *old_entity;
  50         symbol_t           *symbol;
  51         entity_namespace_t  namespc;
  52 } stack_entry_t;
  53
  54 typedef struct declaration_specifiers_t  declaration_specifiers_t;
  55 struct declaration_specifiers_t {
  56         source_position_t  source_position;
  57         storage_class_t    storage_class;
  58         unsigned char      alignment;         /**< Alignment, 0 if not set. */
  59         bool               is_inline    : 1;
  60         bool               thread_local : 1;  /**< GCC __thread */
  61         attribute_t       *attributes;        /**< list of attributes */
  62         type_t            *type;
  63 };
  64
  65 /**
  66  * An environment for parsing initializers (and compound literals).
  67  */
  68 typedef struct parse_initializer_env_t {
  69         type_t     *type;   /**< the type of the initializer. In case of an
  70                                  array type with unspecified size this gets
  71                                  adjusted to the actual size. */
  72         entity_t   *entity; /**< the variable that is initialized if any */
  73         bool        must_be_constant;
  74 } parse_initializer_env_t;
  75
  76 typedef entity_t* (*parsed_declaration_func) (entity_t *declaration, bool is_definition);
  77
  78 /** The current token. */
  79 static token_t              token;
  80 /** The lookahead ring-buffer. */
  81 static token_t              lookahead_buffer[MAX_LOOKAHEAD];
  82 /** Position of the next token in the lookahead buffer. */
  83 static size_t               lookahead_bufpos;
  84 static stack_entry_t       *environment_stack = NULL;
  85 static stack_entry_t       *label_stack       = NULL;
  86 static scope_t             *file_scope        = NULL;
  87 static scope_t             *current_scope     = NULL;
  88 /** Point to the current function declaration if inside a function. */
  89 static function_t          *current_function  = NULL;
  90 static entity_t            *current_init_decl = NULL;
  91 static switch_statement_t  *current_switch    = NULL;
  92 static statement_t         *current_loop      = NULL;
  93 static statement_t         *current_parent    = NULL;
  94 static ms_try_statement_t  *current_try       = NULL;
  95 static linkage_kind_t       current_linkage   = LINKAGE_INVALID;
  96 static goto_statement_t    *goto_first        = NULL;
  97 static goto_statement_t   **goto_anchor       = NULL;
  98 static label_statement_t   *label_first       = NULL;
  99 static label_statement_t  **label_anchor      = NULL;
 100 /** current translation unit. */
 101 static translation_unit_t  *unit              = NULL;
 102 /** true if we are in a type property context (evaluation only for type. */
 103 static bool                 in_type_prop      = false;
 104 /** true in we are in a __extension__ context. */
 105 static bool                 in_gcc_extension  = false;
 106 static struct obstack       temp_obst;
 107 static entity_t            *anonymous_entity;
 108 static declaration_t      **incomplete_arrays;
 109
 110
 111 #define PUSH_PARENT(stmt)                          \
 112         statement_t *const prev_parent = current_parent; \
 113         ((void)(current_parent = (stmt)))
 114 #define POP_PARENT ((void)(current_parent = prev_parent))
 115
 116 /** special symbol used for anonymous entities. */
 117 static symbol_t *sym_anonymous = NULL;
 118
 119 /** The token anchor set */
 120 static unsigned char token_anchor_set[T_LAST_TOKEN];
 121
 122 /** The current source position. */
 123 #define HERE (&token.source_position)
 124
 125 /** true if we are in GCC mode. */
 126 #define GNU_MODE ((c_mode & _GNUC) || in_gcc_extension)
 127
 128 static statement_t *parse_compound_statement(bool inside_expression_statement);
 129 static statement_t *parse_statement(void);
 130
 131 static expression_t *parse_sub_expression(precedence_t);
 132 static expression_t *parse_expression(void);
 133 static type_t       *parse_typename(void);
 134 static void          parse_externals(void);
 135 static void          parse_external(void);
 136
 137 static void parse_compound_type_entries(compound_t *compound_declaration);
 138
 139 static void check_call_argument(type_t          *expected_type,
 140                                                                 call_argument_t *argument, unsigned pos);
 141
 142 typedef enum declarator_flags_t {
 143         DECL_FLAGS_NONE             = 0,
 144         DECL_MAY_BE_ABSTRACT        = 1U << 0,
 145         DECL_CREATE_COMPOUND_MEMBER = 1U << 1,
 146         DECL_IS_PARAMETER           = 1U << 2
 147 } declarator_flags_t;
 148
 149 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
 150                                   declarator_flags_t flags);
 151
 152 static entity_t *record_entity(entity_t *entity, bool is_definition);
 153
 154 static void semantic_comparison(binary_expression_t *expression);
 155
 156 static void create_gnu_builtins(void);
 157 static void create_microsoft_intrinsics(void);
 158
 159 #define STORAGE_CLASSES       \
 160         STORAGE_CLASSES_NO_EXTERN \
 161         case T_extern:
 162
 163 #define STORAGE_CLASSES_NO_EXTERN \
 164         case T_typedef:         \
 165         case T_static:          \
 166         case T_auto:            \
 167         case T_register:        \
 168         case T___thread:
 169
 170 #define TYPE_QUALIFIERS     \
 171         case T_const:           \
 172         case T_restrict:        \
 173         case T_volatile:        \
 174         case T_inline:          \
 175         case T__forceinline:    \
 176         case T___attribute__:
 177
 178 #define COMPLEX_SPECIFIERS  \
 179         case T__Complex:
 180 #define IMAGINARY_SPECIFIERS \
 181         case T__Imaginary:
 182
 183 #define TYPE_SPECIFIERS       \
 184         case T__Bool:             \
 185         case T___builtin_va_list: \
 186         case T___typeof__:        \
 187         case T__declspec:         \
 188         case T_bool:              \
 189         case T_char:              \
 190         case T_double:            \
 191         case T_enum:              \
 192         case T_float:             \
 193         case T_int:               \
 194         case T_long:              \
 195         case T_short:             \
 196         case T_signed:            \
 197         case T_struct:            \
 198         case T_union:             \
 199         case T_unsigned:          \
 200         case T_void:              \
 201         case T_wchar_t:           \
 202         case T__int8:             \
 203         case T__int16:            \
 204         case T__int32:            \
 205         case T__int64:            \
 206         case T__int128:           \
 207         COMPLEX_SPECIFIERS        \
 208         IMAGINARY_SPECIFIERS
 209
 210 #define DECLARATION_START   \
 211         STORAGE_CLASSES         \
 212         TYPE_QUALIFIERS         \
 213         TYPE_SPECIFIERS
 214
 215 #define DECLARATION_START_NO_EXTERN \
 216         STORAGE_CLASSES_NO_EXTERN       \
 217         TYPE_QUALIFIERS                 \
 218         TYPE_SPECIFIERS
 219
 220 #define TYPENAME_START      \
 221         TYPE_QUALIFIERS         \
 222         TYPE_SPECIFIERS
 223
 224 #define EXPRESSION_START           \
 225         case '!':                        \
 226         case '&':                        \
 227         case '(':                        \
 228         case '*':                        \
 229         case '+':                        \
 230         case '-':                        \
 231         case '~':                        \
 232         case T_ANDAND:                   \
 233         case T_CHARACTER_CONSTANT:       \
 234         case T_FLOATINGPOINT:            \
 235         case T_INTEGER:                  \
 236         case T_MINUSMINUS:               \
 237         case T_PLUSPLUS:                 \
 238         case T_STRING_LITERAL:           \
 239         case T_WIDE_CHARACTER_CONSTANT:  \
 240         case T_WIDE_STRING_LITERAL:      \
 241         case T___FUNCDNAME__:            \
 242         case T___FUNCSIG__:              \
 243         case T___FUNCTION__:             \
 244         case T___PRETTY_FUNCTION__:      \
 245         case T___alignof__:              \
 246         case T___builtin_classify_type:  \
 247         case T___builtin_constant_p:     \
 248         case T___builtin_isgreater:      \
 249         case T___builtin_isgreaterequal: \
 250         case T___builtin_isless:         \
 251         case T___builtin_islessequal:    \
 252         case T___builtin_islessgreater:  \
 253         case T___builtin_isunordered:    \
 254         case T___builtin_offsetof:       \
 255         case T___builtin_va_arg:         \
 256         case T___builtin_va_start:       \
 257         case T___builtin_va_copy:        \
 258         case T___func__:                 \
 259         case T___noop:                   \
 260         case T__assume:                  \
 261         case T_delete:                   \
 262         case T_false:                    \
 263         case T_sizeof:                   \
 264         case T_throw:                    \
 265         case T_true:
 266
 267 /**
 268  * Allocate an AST node with given size and
 269  * initialize all fields with zero.
 270  */
 271 static void *allocate_ast_zero(size_t size)
 272 {
 273         void *res = allocate_ast(size);
 274         memset(res, 0, size);
 275         return res;
 276 }
 277
 278 /**
 279  * Returns the size of an entity node.
 280  *
 281  * @param kind  the entity kind
 282  */
 283 static size_t get_entity_struct_size(entity_kind_t kind)
 284 {
 285         static const size_t sizes[] = {
 286                 [ENTITY_VARIABLE]        = sizeof(variable_t),
 287                 [ENTITY_PARAMETER]       = sizeof(parameter_t),
 288                 [ENTITY_COMPOUND_MEMBER] = sizeof(compound_member_t),
 289                 [ENTITY_FUNCTION]        = sizeof(function_t),
 290                 [ENTITY_TYPEDEF]         = sizeof(typedef_t),
 291                 [ENTITY_STRUCT]          = sizeof(compound_t),
 292                 [ENTITY_UNION]           = sizeof(compound_t),
 293                 [ENTITY_ENUM]            = sizeof(enum_t),
 294                 [ENTITY_ENUM_VALUE]      = sizeof(enum_value_t),
 295                 [ENTITY_LABEL]           = sizeof(label_t),
 296                 [ENTITY_LOCAL_LABEL]     = sizeof(label_t),
 297                 [ENTITY_NAMESPACE]       = sizeof(namespace_t)
 298         };
 299         assert(kind < lengthof(sizes));
 300         assert(sizes[kind] != 0);
 301         return sizes[kind];
 302 }
 303
 304 /**
 305  * Allocate an entity of given kind and initialize all
 306  * fields with zero.
 307  *
 308  * @param kind   the kind of the entity to allocate
 309  */
 310 static entity_t *allocate_entity_zero(entity_kind_t kind)
 311 {
 312         size_t    size   = get_entity_struct_size(kind);
 313         entity_t *entity = allocate_ast_zero(size);
 314         entity->kind     = kind;
 315         return entity;
 316 }
 317
 318 /**
 319  * Returns the size of a statement node.
 320  *
 321  * @param kind  the statement kind
 322  */
 323 static size_t get_statement_struct_size(statement_kind_t kind)
 324 {
 325         static const size_t sizes[] = {
 326                 [STATEMENT_INVALID]     = sizeof(invalid_statement_t),
 327                 [STATEMENT_EMPTY]       = sizeof(empty_statement_t),
 328                 [STATEMENT_COMPOUND]    = sizeof(compound_statement_t),
 329                 [STATEMENT_RETURN]      = sizeof(return_statement_t),
 330                 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
 331                 [STATEMENT_IF]          = sizeof(if_statement_t),
 332                 [STATEMENT_SWITCH]      = sizeof(switch_statement_t),
 333                 [STATEMENT_EXPRESSION]  = sizeof(expression_statement_t),
 334                 [STATEMENT_CONTINUE]    = sizeof(statement_base_t),
 335                 [STATEMENT_BREAK]       = sizeof(statement_base_t),
 336                 [STATEMENT_GOTO]        = sizeof(goto_statement_t),
 337                 [STATEMENT_LABEL]       = sizeof(label_statement_t),
 338                 [STATEMENT_CASE_LABEL]  = sizeof(case_label_statement_t),
 339                 [STATEMENT_WHILE]       = sizeof(while_statement_t),
 340                 [STATEMENT_DO_WHILE]    = sizeof(do_while_statement_t),
 341                 [STATEMENT_FOR]         = sizeof(for_statement_t),
 342                 [STATEMENT_ASM]         = sizeof(asm_statement_t),
 343                 [STATEMENT_MS_TRY]      = sizeof(ms_try_statement_t),
 344                 [STATEMENT_LEAVE]       = sizeof(leave_statement_t)
 345         };
 346         assert(kind < lengthof(sizes));
 347         assert(sizes[kind] != 0);
 348         return sizes[kind];
 349 }
 350
 351 /**
 352  * Returns the size of an expression node.
 353  *
 354  * @param kind  the expression kind
 355  */
 356 static size_t get_expression_struct_size(expression_kind_t kind)
 357 {
 358         static const size_t sizes[] = {
 359                 [EXPR_INVALID]                    = sizeof(expression_base_t),
 360                 [EXPR_REFERENCE]                  = sizeof(reference_expression_t),
 361                 [EXPR_REFERENCE_ENUM_VALUE]       = sizeof(reference_expression_t),
 362                 [EXPR_CONST]                      = sizeof(const_expression_t),
 363                 [EXPR_CHARACTER_CONSTANT]         = sizeof(const_expression_t),
 364                 [EXPR_WIDE_CHARACTER_CONSTANT]    = sizeof(const_expression_t),
 365                 [EXPR_STRING_LITERAL]             = sizeof(string_literal_expression_t),
 366                 [EXPR_WIDE_STRING_LITERAL]        = sizeof(wide_string_literal_expression_t),
 367                 [EXPR_COMPOUND_LITERAL]           = sizeof(compound_literal_expression_t),
 368                 [EXPR_CALL]                       = sizeof(call_expression_t),
 369                 [EXPR_UNARY_FIRST]                = sizeof(unary_expression_t),
 370                 [EXPR_BINARY_FIRST]               = sizeof(binary_expression_t),
 371                 [EXPR_CONDITIONAL]                = sizeof(conditional_expression_t),
 372                 [EXPR_SELECT]                     = sizeof(select_expression_t),
 373                 [EXPR_ARRAY_ACCESS]               = sizeof(array_access_expression_t),
 374                 [EXPR_SIZEOF]                     = sizeof(typeprop_expression_t),
 375                 [EXPR_ALIGNOF]                    = sizeof(typeprop_expression_t),
 376                 [EXPR_CLASSIFY_TYPE]              = sizeof(classify_type_expression_t),
 377                 [EXPR_FUNCNAME]                   = sizeof(funcname_expression_t),
 378                 [EXPR_BUILTIN_CONSTANT_P]         = sizeof(builtin_constant_expression_t),
 379                 [EXPR_BUILTIN_TYPES_COMPATIBLE_P] = sizeof(builtin_types_compatible_expression_t),
 380                 [EXPR_OFFSETOF]                   = sizeof(offsetof_expression_t),
 381                 [EXPR_VA_START]                   = sizeof(va_start_expression_t),
 382                 [EXPR_VA_ARG]                     = sizeof(va_arg_expression_t),
 383                 [EXPR_VA_COPY]                    = sizeof(va_copy_expression_t),
 384                 [EXPR_STATEMENT]                  = sizeof(statement_expression_t),
 385                 [EXPR_LABEL_ADDRESS]              = sizeof(label_address_expression_t),
 386         };
 387         if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
 388                 return sizes[EXPR_UNARY_FIRST];
 389         }
 390         if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
 391                 return sizes[EXPR_BINARY_FIRST];
 392         }
 393         assert(kind < lengthof(sizes));
 394         assert(sizes[kind] != 0);
 395         return sizes[kind];
 396 }
 397
 398 /**
 399  * Allocate a statement node of given kind and initialize all
 400  * fields with zero. Sets its source position to the position
 401  * of the current token.
 402  */
 403 static statement_t *allocate_statement_zero(statement_kind_t kind)
 404 {
 405         size_t       size = get_statement_struct_size(kind);
 406         statement_t *res  = allocate_ast_zero(size);
 407
 408         res->base.kind            = kind;
 409         res->base.parent          = current_parent;
 410         res->base.source_position = token.source_position;
 411         return res;
 412 }
 413
 414 /**
 415  * Allocate an expression node of given kind and initialize all
 416  * fields with zero.
 417  *
 418  * @param kind  the kind of the expression to allocate
 419  */
 420 static expression_t *allocate_expression_zero(expression_kind_t kind)
 421 {
 422         size_t        size = get_expression_struct_size(kind);
 423         expression_t *res  = allocate_ast_zero(size);
 424
 425         res->base.kind            = kind;
 426         res->base.type            = type_error_type;
 427         res->base.source_position = token.source_position;
 428         return res;
 429 }
 430
 431 /**
 432  * Creates a new invalid expression at the source position
 433  * of the current token.
 434  */
 435 static expression_t *create_invalid_expression(void)
 436 {
 437         return allocate_expression_zero(EXPR_INVALID);
 438 }
 439
 440 /**
 441  * Creates a new invalid statement.
 442  */
 443 static statement_t *create_invalid_statement(void)
 444 {
 445         return allocate_statement_zero(STATEMENT_INVALID);
 446 }
 447
 448 /**
 449  * Allocate a new empty statement.
 450  */
 451 static statement_t *create_empty_statement(void)
 452 {
 453         return allocate_statement_zero(STATEMENT_EMPTY);
 454 }
 455
 456 /**
 457  * Returns the size of a type node.
 458  *
 459  * @param kind  the type kind
 460  */
 461 static size_t get_type_struct_size(type_kind_t kind)
 462 {
 463         static const size_t sizes[] = {
 464                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
 465                 [TYPE_COMPLEX]         = sizeof(complex_type_t),
 466                 [TYPE_IMAGINARY]       = sizeof(imaginary_type_t),
 467                 [TYPE_BITFIELD]        = sizeof(bitfield_type_t),
 468                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
 469                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
 470                 [TYPE_ENUM]            = sizeof(enum_type_t),
 471                 [TYPE_FUNCTION]        = sizeof(function_type_t),
 472                 [TYPE_POINTER]         = sizeof(pointer_type_t),
 473                 [TYPE_ARRAY]           = sizeof(array_type_t),
 474                 [TYPE_BUILTIN]         = sizeof(builtin_type_t),
 475                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
 476                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
 477         };
 478         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
 479         assert(kind <= TYPE_TYPEOF);
 480         assert(sizes[kind] != 0);
 481         return sizes[kind];
 482 }
 483
 484 /**
 485  * Allocate a type node of given kind and initialize all
 486  * fields with zero.
 487  *
 488  * @param kind             type kind to allocate
 489  */
 490 static type_t *allocate_type_zero(type_kind_t kind)
 491 {
 492         size_t  size = get_type_struct_size(kind);
 493         type_t *res  = obstack_alloc(type_obst, size);
 494         memset(res, 0, size);
 495         res->base.kind = kind;
 496
 497         return res;
 498 }
 499
 500 static function_parameter_t *allocate_parameter(type_t *const type)
 501 {
 502         function_parameter_t *const param = obstack_alloc(type_obst, sizeof(*param));
 503         memset(param, 0, sizeof(*param));
 504         param->type = type;
 505         return param;
 506 }
 507
 508 /**
 509  * Returns the size of an initializer node.
 510  *
 511  * @param kind  the initializer kind
 512  */
 513 static size_t get_initializer_size(initializer_kind_t kind)
 514 {
 515         static const size_t sizes[] = {
 516                 [INITIALIZER_VALUE]       = sizeof(initializer_value_t),
 517                 [INITIALIZER_STRING]      = sizeof(initializer_string_t),
 518                 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
 519                 [INITIALIZER_LIST]        = sizeof(initializer_list_t),
 520                 [INITIALIZER_DESIGNATOR]  = sizeof(initializer_designator_t)
 521         };
 522         assert(kind < lengthof(sizes));
 523         assert(sizes[kind] != 0);
 524         return sizes[kind];
 525 }
 526
 527 /**
 528  * Allocate an initializer node of given kind and initialize all
 529  * fields with zero.
 530  */
 531 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
 532 {
 533         initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
 534         result->kind          = kind;
 535
 536         return result;
 537 }
 538
 539 /**
 540  * Returns the index of the top element of the environment stack.
 541  */
 542 static size_t environment_top(void)
 543 {
 544         return ARR_LEN(environment_stack);
 545 }
 546
 547 /**
 548  * Returns the index of the top element of the global label stack.
 549  */
 550 static size_t label_top(void)
 551 {
 552         return ARR_LEN(label_stack);
 553 }
 554
 555 /**
 556  * Return the next token.
 557  */
 558 static inline void next_token(void)
 559 {
 560         token                              = lookahead_buffer[lookahead_bufpos];
 561         lookahead_buffer[lookahead_bufpos] = lexer_token;
 562         lexer_next_token();
 563
 564         lookahead_bufpos = (lookahead_bufpos + 1) % MAX_LOOKAHEAD;
 565
 566 #ifdef PRINT_TOKENS
 567         print_token(stderr, &token);
 568         fprintf(stderr, "\n");
 569 #endif
 570 }
 571
 572 /**
 573  * Return the next token with a given lookahead.
 574  */
 575 static inline const token_t *look_ahead(size_t num)
 576 {
 577         assert(0 < num && num <= MAX_LOOKAHEAD);
 578         size_t pos = (lookahead_bufpos + num - 1) % MAX_LOOKAHEAD;
 579         return &lookahead_buffer[pos];
 580 }
 581
 582 /**
 583  * Adds a token type to the token type anchor set (a multi-set).
 584  */
 585 static void add_anchor_token(int token_type)
 586 {
 587         assert(0 <= token_type && token_type < T_LAST_TOKEN);
 588         ++token_anchor_set[token_type];
 589 }
 590
 591 /**
 592  * Set the number of tokens types of the given type
 593  * to zero and return the old count.
 594  */
 595 static int save_and_reset_anchor_state(int token_type)
 596 {
 597         assert(0 <= token_type && token_type < T_LAST_TOKEN);
 598         int count = token_anchor_set[token_type];
 599         token_anchor_set[token_type] = 0;
 600         return count;
 601 }
 602
 603 /**
 604  * Restore the number of token types to the given count.
 605  */
 606 static void restore_anchor_state(int token_type, int count)
 607 {
 608         assert(0 <= token_type && token_type < T_LAST_TOKEN);
 609         token_anchor_set[token_type] = count;
 610 }
 611
 612 /**
 613  * Remove a token type from the token type anchor set (a multi-set).
 614  */
 615 static void rem_anchor_token(int token_type)
 616 {
 617         assert(0 <= token_type && token_type < T_LAST_TOKEN);
 618         assert(token_anchor_set[token_type] != 0);
 619         --token_anchor_set[token_type];
 620 }
 621
 622 /**
 623  * Return true if the token type of the current token is
 624  * in the anchor set.
 625  */
 626 static bool at_anchor(void)
 627 {
 628         if (token.type < 0)
 629                 return false;
 630         return token_anchor_set[token.type];
 631 }
 632
 633 /**
 634  * Eat tokens until a matching token type is found.
 635  */
 636 static void eat_until_matching_token(int type)
 637 {
 638         int end_token;
 639         switch (type) {
 640                 case '(': end_token = ')';  break;
 641                 case '{': end_token = '}';  break;
 642                 case '[': end_token = ']';  break;
 643                 default:  end_token = type; break;
 644         }
 645
 646         unsigned parenthesis_count = 0;
 647         unsigned brace_count       = 0;
 648         unsigned bracket_count     = 0;
 649         while (token.type        != end_token ||
 650                parenthesis_count != 0         ||
 651                brace_count       != 0         ||
 652                bracket_count     != 0) {
 653                 switch (token.type) {
 654                 case T_EOF: return;
 655                 case '(': ++parenthesis_count; break;
 656                 case '{': ++brace_count;       break;
 657                 case '[': ++bracket_count;     break;
 658
 659                 case ')':
 660                         if (parenthesis_count > 0)
 661                                 --parenthesis_count;
 662                         goto check_stop;
 663
 664                 case '}':
 665                         if (brace_count > 0)
 666                                 --brace_count;
 667                         goto check_stop;
 668
 669                 case ']':
 670                         if (bracket_count > 0)
 671                                 --bracket_count;
 672 check_stop:
 673                         if (token.type        == end_token &&
 674                             parenthesis_count == 0         &&
 675                             brace_count       == 0         &&
 676                             bracket_count     == 0)
 677                                 return;
 678                         break;
 679
 680                 default:
 681                         break;
 682                 }
 683                 next_token();
 684         }
 685 }
 686
 687 /**
 688  * Eat input tokens until an anchor is found.
 689  */
 690 static void eat_until_anchor(void)
 691 {
 692         while (token_anchor_set[token.type] == 0) {
 693                 if (token.type == '(' || token.type == '{' || token.type == '[')
 694                         eat_until_matching_token(token.type);
 695                 next_token();
 696         }
 697 }
 698
 699 /**
 700  * Eat a whole block from input tokens.
 701  */
 702 static void eat_block(void)
 703 {
 704         eat_until_matching_token('{');
 705         if (token.type == '}')
 706                 next_token();
 707 }
 708
 709 #define eat(token_type) (assert(token.type == (token_type)), next_token())
 710
 711 /**
 712  * Report a parse error because an expected token was not found.
 713  */
 714 static
 715 #if defined __GNUC__ && __GNUC__ >= 4
 716 __attribute__((sentinel))
 717 #endif
 718 void parse_error_expected(const char *message, ...)
 719 {
 720         if (message != NULL) {
 721                 errorf(HERE, "%s", message);
 722         }
 723         va_list ap;
 724         va_start(ap, message);
 725         errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
 726         va_end(ap);
 727 }
 728
 729 /**
 730  * Report an incompatible type.
 731  */
 732 static void type_error_incompatible(const char *msg,
 733                 const source_position_t *source_position, type_t *type1, type_t *type2)
 734 {
 735         errorf(source_position, "%s, incompatible types: '%T' - '%T'",
 736                msg, type1, type2);
 737 }
 738
 739 /**
 740  * Expect the current token is the expected token.
 741  * If not, generate an error, eat the current statement,
 742  * and goto the end_error label.
 743  */
 744 #define expect(expected, error_label)                     \
 745         do {                                                  \
 746                 if (UNLIKELY(token.type != (expected))) {         \
 747                         parse_error_expected(NULL, (expected), NULL); \
 748                         add_anchor_token(expected);                   \
 749                         eat_until_anchor();                           \
 750                         if (token.type == expected)                   \
 751                                 next_token();                             \
 752                         rem_anchor_token(expected);                   \
 753                         goto error_label;                             \
 754                 }                                                 \
 755                 next_token();                                     \
 756         } while (0)
 757
 758 /**
 759  * Push a given scope on the scope stack and make it the
 760  * current scope
 761  */
 762 static scope_t *scope_push(scope_t *new_scope)
 763 {
 764         if (current_scope != NULL) {
 765                 new_scope->depth = current_scope->depth + 1;
 766         }
 767
 768         scope_t *old_scope = current_scope;
 769         current_scope      = new_scope;
 770         return old_scope;
 771 }
 772
 773 /**
 774  * Pop the current scope from the scope stack.
 775  */
 776 static void scope_pop(scope_t *old_scope)
 777 {
 778         current_scope = old_scope;
 779 }
 780
 781 /**
 782  * Search an entity by its symbol in a given namespace.
 783  */
 784 static entity_t *get_entity(const symbol_t *const symbol,
 785                             namespace_tag_t namespc)
 786 {
 787         entity_t *entity = symbol->entity;
 788         for (; entity != NULL; entity = entity->base.symbol_next) {
 789                 if (entity->base.namespc == namespc)
 790                         return entity;
 791         }
 792
 793         return NULL;
 794 }
 795
 796 /* §6.2.3:1 24)  There is only one name space for tags even though three are
 797  * possible. */
 798 static entity_t *get_tag(symbol_t const *const symbol,
 799                          entity_kind_tag_t const kind)
 800 {
 801         entity_t *entity = get_entity(symbol, NAMESPACE_TAG);
 802         if (entity != NULL && entity->kind != kind) {
 803                 errorf(HERE,
 804                                 "'%Y' defined as wrong kind of tag (previous definition %P)",
 805                                 symbol, &entity->base.source_position);
 806                 entity = NULL;
 807         }
 808         return entity;
 809 }
 810
 811 /**
 812  * pushs an entity on the environment stack and links the corresponding symbol
 813  * it.
 814  */
 815 static void stack_push(stack_entry_t **stack_ptr, entity_t *entity)
 816 {
 817         symbol_t           *symbol  = entity->base.symbol;
 818         entity_namespace_t  namespc = entity->base.namespc;
 819         assert(namespc != NAMESPACE_INVALID);
 820
 821         /* replace/add entity into entity list of the symbol */
 822         entity_t **anchor;
 823         entity_t  *iter;
 824         for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
 825                 iter = *anchor;
 826                 if (iter == NULL)
 827                         break;
 828
 829                 /* replace an entry? */
 830                 if (iter->base.namespc == namespc) {
 831                         entity->base.symbol_next = iter->base.symbol_next;
 832                         break;
 833                 }
 834         }
 835         *anchor = entity;
 836
 837         /* remember old declaration */
 838         stack_entry_t entry;
 839         entry.symbol     = symbol;
 840         entry.old_entity = iter;
 841         entry.namespc    = namespc;
 842         ARR_APP1(stack_entry_t, *stack_ptr, entry);
 843 }
 844
 845 /**
 846  * Push an entity on the environment stack.
 847  */
 848 static void environment_push(entity_t *entity)
 849 {
 850         assert(entity->base.source_position.input_name != NULL);
 851         assert(entity->base.parent_scope != NULL);
 852         stack_push(&environment_stack, entity);
 853 }
 854
 855 /**
 856  * Push a declaration on the global label stack.
 857  *
 858  * @param declaration  the declaration
 859  */
 860 static void label_push(entity_t *label)
 861 {
 862         /* we abuse the parameters scope as parent for the labels */
 863         label->base.parent_scope = &current_function->parameters;
 864         stack_push(&label_stack, label);
 865 }
 866
 867 /**
 868  * pops symbols from the environment stack until @p new_top is the top element
 869  */
 870 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
 871 {
 872         stack_entry_t *stack = *stack_ptr;
 873         size_t         top   = ARR_LEN(stack);
 874         size_t         i;
 875
 876         assert(new_top <= top);
 877         if (new_top == top)
 878                 return;
 879
 880         for (i = top; i > new_top; --i) {
 881                 stack_entry_t *entry = &stack[i - 1];
 882
 883                 entity_t           *old_entity = entry->old_entity;
 884                 symbol_t           *symbol     = entry->symbol;
 885                 entity_namespace_t  namespc    = entry->namespc;
 886
 887                 /* replace with old_entity/remove */
 888                 entity_t **anchor;
 889                 entity_t  *iter;
 890                 for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) {
 891                         iter = *anchor;
 892                         assert(iter != NULL);
 893                         /* replace an entry? */
 894                         if (iter->base.namespc == namespc)
 895                                 break;
 896                 }
 897
 898                 /* restore definition from outer scopes (if there was one) */
 899                 if (old_entity != NULL) {
 900                         old_entity->base.symbol_next = iter->base.symbol_next;
 901                         *anchor                      = old_entity;
 902                 } else {
 903                         /* remove entry from list */
 904                         *anchor = iter->base.symbol_next;
 905                 }
 906         }
 907
 908         ARR_SHRINKLEN(*stack_ptr, (int) new_top);
 909 }
 910
 911 /**
 912  * Pop all entries from the environment stack until the new_top
 913  * is reached.
 914  *
 915  * @param new_top  the new stack top
 916  */
 917 static void environment_pop_to(size_t new_top)
 918 {
 919         stack_pop_to(&environment_stack, new_top);
 920 }
 921
 922 /**
 923  * Pop all entries from the global label stack until the new_top
 924  * is reached.
 925  *
 926  * @param new_top  the new stack top
 927  */
 928 static void label_pop_to(size_t new_top)
 929 {
 930         stack_pop_to(&label_stack, new_top);
 931 }
 932
 933 static int get_akind_rank(atomic_type_kind_t akind)
 934 {
 935         return (int) akind;
 936 }
 937
 938 /**
 939  * Return the type rank for an atomic type.
 940  */
 941 static int get_rank(const type_t *type)
 942 {
 943         assert(!is_typeref(type));
 944         if (type->kind == TYPE_ENUM)
 945                 return get_akind_rank(type->enumt.akind);
 946
 947         assert(type->kind == TYPE_ATOMIC);
 948         return get_akind_rank(type->atomic.akind);
 949 }
 950
 951 /**
 952  * §6.3.1.1:2  Do integer promotion for a given type.
 953  *
 954  * @param type  the type to promote
 955  * @return the promoted type
 956  */
 957 static type_t *promote_integer(type_t *type)
 958 {
 959         if (type->kind == TYPE_BITFIELD)
 960                 type = type->bitfield.base_type;
 961
 962         if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
 963                 type = type_int;
 964
 965         return type;
 966 }
 967
 968 /**
 969  * Create a cast expression.
 970  *
 971  * @param expression  the expression to cast
 972  * @param dest_type   the destination type
 973  */
 974 static expression_t *create_cast_expression(expression_t *expression,
 975                                             type_t *dest_type)
 976 {
 977         expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
 978
 979         cast->unary.value = expression;
 980         cast->base.type   = dest_type;
 981
 982         return cast;
 983 }
 984
 985 /**
 986  * Check if a given expression represents a null pointer constant.
 987  *
 988  * @param expression  the expression to check
 989  */
 990 static bool is_null_pointer_constant(const expression_t *expression)
 991 {
 992         /* skip void* cast */
 993         if (expression->kind == EXPR_UNARY_CAST ||
 994                         expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 995                 type_t *const type = skip_typeref(expression->base.type);
 996                 if (types_compatible(type, type_void_ptr))
 997                         expression = expression->unary.value;
 998         }
 999
1000         type_t *const type = skip_typeref(expression->base.type);
1001         return
1002                 is_type_integer(type)              &&
1003                 is_constant_expression(expression) &&
1004                 !fold_constant_to_bool(expression);
1005 }
1006
1007 /**
1008  * Create an implicit cast expression.
1009  *
1010  * @param expression  the expression to cast
1011  * @param dest_type   the destination type
1012  */
1013 static expression_t *create_implicit_cast(expression_t *expression,
1014                                           type_t *dest_type)
1015 {
1016         type_t *const source_type = expression->base.type;
1017
1018         if (source_type == dest_type)
1019                 return expression;
1020
1021         return create_cast_expression(expression, dest_type);
1022 }
1023
1024 typedef enum assign_error_t {
1025         ASSIGN_SUCCESS,
1026         ASSIGN_ERROR_INCOMPATIBLE,
1027         ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
1028         ASSIGN_WARNING_POINTER_INCOMPATIBLE,
1029         ASSIGN_WARNING_POINTER_FROM_INT,
1030         ASSIGN_WARNING_INT_FROM_POINTER
1031 } assign_error_t;
1032
1033 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
1034                                 const expression_t *const right,
1035                                 const char *context,
1036                                 const source_position_t *source_position)
1037 {
1038         type_t *const orig_type_right = right->base.type;
1039         type_t *const type_left       = skip_typeref(orig_type_left);
1040         type_t *const type_right      = skip_typeref(orig_type_right);
1041
1042         switch (error) {
1043         case ASSIGN_SUCCESS:
1044                 return;
1045         case ASSIGN_ERROR_INCOMPATIBLE:
1046                 errorf(source_position,
1047                        "destination type '%T' in %s is incompatible with type '%T'",
1048                        orig_type_left, context, orig_type_right);
1049                 return;
1050
1051         case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1052                 if (warning.other) {
1053                         type_t *points_to_left  = skip_typeref(type_left->pointer.points_to);
1054                         type_t *points_to_right = skip_typeref(type_right->pointer.points_to);
1055
1056                         /* the left type has all qualifiers from the right type */
1057                         unsigned missing_qualifiers
1058                                 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1059                         warningf(source_position,
1060                                         "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1061                                         orig_type_left, context, orig_type_right, missing_qualifiers);
1062                 }
1063                 return;
1064         }
1065
1066         case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1067                 if (warning.other) {
1068                         warningf(source_position,
1069                                         "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1070                                         orig_type_left, context, right, orig_type_right);
1071                 }
1072                 return;
1073
1074         case ASSIGN_WARNING_POINTER_FROM_INT:
1075                 if (warning.other) {
1076                         warningf(source_position,
1077                                         "%s makes pointer '%T' from integer '%T' without a cast",
1078                                         context, orig_type_left, orig_type_right);
1079                 }
1080                 return;
1081
1082         case ASSIGN_WARNING_INT_FROM_POINTER:
1083                 if (warning.other) {
1084                         warningf(source_position,
1085                                         "%s makes integer '%T' from pointer '%T' without a cast",
1086                                         context, orig_type_left, orig_type_right);
1087                 }
1088                 return;
1089
1090         default:
1091                 panic("invalid error value");
1092         }
1093 }
1094
1095 /** Implements the rules from §6.5.16.1 */
1096 static assign_error_t semantic_assign(type_t *orig_type_left,
1097                                       const expression_t *const right)
1098 {
1099         type_t *const orig_type_right = right->base.type;
1100         type_t *const type_left       = skip_typeref(orig_type_left);
1101         type_t *const type_right      = skip_typeref(orig_type_right);
1102
1103         if (is_type_pointer(type_left)) {
1104                 if (is_null_pointer_constant(right)) {
1105                         return ASSIGN_SUCCESS;
1106                 } else if (is_type_pointer(type_right)) {
1107                         type_t *points_to_left
1108                                 = skip_typeref(type_left->pointer.points_to);
1109                         type_t *points_to_right
1110                                 = skip_typeref(type_right->pointer.points_to);
1111                         assign_error_t res = ASSIGN_SUCCESS;
1112
1113                         /* the left type has all qualifiers from the right type */
1114                         unsigned missing_qualifiers
1115                                 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1116                         if (missing_qualifiers != 0) {
1117                                 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1118                         }
1119
1120                         points_to_left  = get_unqualified_type(points_to_left);
1121                         points_to_right = get_unqualified_type(points_to_right);
1122
1123                         if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID))
1124                                 return res;
1125
1126                         if (is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1127                                 /* ISO/IEC 14882:1998(E) §C.1.2:6 */
1128                                 return c_mode & _CXX ? ASSIGN_ERROR_INCOMPATIBLE : res;
1129                         }
1130
1131                         if (!types_compatible(points_to_left, points_to_right)) {
1132                                 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1133                         }
1134
1135                         return res;
1136                 } else if (is_type_integer(type_right)) {
1137                         return ASSIGN_WARNING_POINTER_FROM_INT;
1138                 }
1139         } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1140             (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1141                 && is_type_pointer(type_right))) {
1142                 return ASSIGN_SUCCESS;
1143         } else if ((is_type_compound(type_left)  && is_type_compound(type_right))
1144                         || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1145                 type_t *const unqual_type_left  = get_unqualified_type(type_left);
1146                 type_t *const unqual_type_right = get_unqualified_type(type_right);
1147                 if (types_compatible(unqual_type_left, unqual_type_right)) {
1148                         return ASSIGN_SUCCESS;
1149                 }
1150         } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1151                 return ASSIGN_WARNING_INT_FROM_POINTER;
1152         }
1153
1154         if (!is_type_valid(type_left) || !is_type_valid(type_right))
1155                 return ASSIGN_SUCCESS;
1156
1157         return ASSIGN_ERROR_INCOMPATIBLE;
1158 }
1159
1160 static expression_t *parse_constant_expression(void)
1161 {
1162         expression_t *result = parse_sub_expression(PREC_CONDITIONAL);
1163
1164         if (!is_constant_expression(result)) {
1165                 errorf(&result->base.source_position,
1166                        "expression '%E' is not constant", result);
1167         }
1168
1169         return result;
1170 }
1171
1172 static expression_t *parse_assignment_expression(void)
1173 {
1174         return parse_sub_expression(PREC_ASSIGNMENT);
1175 }
1176
1177 static string_t parse_string_literals(void)
1178 {
1179         assert(token.type == T_STRING_LITERAL);
1180         string_t result = token.v.string;
1181
1182         next_token();
1183
1184         while (token.type == T_STRING_LITERAL) {
1185                 result = concat_strings(&result, &token.v.string);
1186                 next_token();
1187         }
1188
1189         return result;
1190 }
1191
1192 /**
1193  * compare two string, ignoring double underscores on the second.
1194  */
1195 static int strcmp_underscore(const char *s1, const char *s2)
1196 {
1197         if (s2[0] == '_' && s2[1] == '_') {
1198                 size_t len2 = strlen(s2);
1199                 size_t len1 = strlen(s1);
1200                 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1201                         return strncmp(s1, s2+2, len2-4);
1202                 }
1203         }
1204
1205         return strcmp(s1, s2);
1206 }
1207
1208 static attribute_t *allocate_attribute_zero(attribute_kind_t kind)
1209 {
1210         attribute_t *attribute = allocate_ast_zero(sizeof(*attribute));
1211         attribute->kind        = kind;
1212         return attribute;
1213 }
1214
1215 /**
1216  * Parse (gcc) attribute argument. From gcc comments in gcc source:
1217  *
1218  *  attribute:
1219  *    __attribute__ ( ( attribute-list ) )
1220  *
1221  *  attribute-list:
1222  *    attrib
1223  *    attribute_list , attrib
1224  *
1225  *  attrib:
1226  *    empty
1227  *    any-word
1228  *    any-word ( identifier )
1229  *    any-word ( identifier , nonempty-expr-list )
1230  *    any-word ( expr-list )
1231  *
1232  *  where the "identifier" must not be declared as a type, and
1233  *  "any-word" may be any identifier (including one declared as a
1234  *  type), a reserved word storage class specifier, type specifier or
1235  *  type qualifier.  ??? This still leaves out most reserved keywords
1236  *  (following the old parser), shouldn't we include them, and why not
1237  *  allow identifiers declared as types to start the arguments?
1238  *
1239  *  Matze: this all looks confusing and little systematic, so we're even less
1240  *  strict and parse any list of things which are identifiers or
1241  *  (assignment-)expressions.
1242  */
1243 static attribute_argument_t *parse_attribute_arguments(void)
1244 {
1245         if (token.type == ')')
1246                 return NULL;
1247
1248         attribute_argument_t *first = NULL;
1249         attribute_argument_t *last  = NULL;
1250         while (true) {
1251                 attribute_argument_t *argument = allocate_ast_zero(sizeof(*argument));
1252
1253                 /* is it an identifier */
1254                 if (token.type == T_IDENTIFIER
1255                                 && (look_ahead(1)->type == ',' || look_ahead(1)->type == ')')) {
1256                         symbol_t *symbol   = token.v.symbol;
1257                         argument->kind     = ATTRIBUTE_ARGUMENT_SYMBOL;
1258                         argument->v.symbol = symbol;
1259                         next_token();
1260                 } else {
1261                         /* must be an expression */
1262                         expression_t *expression = parse_assignment_expression();
1263
1264                         argument->kind         = ATTRIBUTE_ARGUMENT_EXPRESSION;
1265                         argument->v.expression = expression;
1266                 }
1267
1268                 /* append argument */
1269                 if (last == NULL) {
1270                         first = argument;
1271                 } else {
1272                         last->next = argument;
1273                 }
1274                 last = argument;
1275
1276                 if (token.type == ',') {
1277                         next_token();
1278                         continue;
1279                 }
1280                 expect(')', end_error);
1281                 break;
1282         }
1283
1284         return first;
1285
1286 end_error:
1287         /* TODO... */
1288         return first;
1289 }
1290
1291 static attribute_t *parse_attribute_asm(void)
1292 {
1293         eat(T_asm);
1294
1295         attribute_t *attribute = allocate_attribute_zero(ATTRIBUTE_GNU_ASM);
1296
1297         expect('(', end_error);
1298         attribute->a.arguments = parse_attribute_arguments();
1299         return attribute;
1300
1301 end_error:
1302         return NULL;
1303 }
1304
1305 static symbol_t *get_symbol_from_token(void)
1306 {
1307         switch(token.type) {
1308         case T_IDENTIFIER:
1309                 return token.v.symbol;
1310         case T_auto:
1311         case T_char:
1312         case T_double:
1313         case T_enum:
1314         case T_extern:
1315         case T_float:
1316         case T_int:
1317         case T_long:
1318         case T_register:
1319         case T_short:
1320         case T_static:
1321         case T_struct:
1322         case T_union:
1323         case T_unsigned:
1324         case T_void:
1325         case T_bool:
1326         case T__Bool:
1327         case T_class:
1328         case T_explicit:
1329         case T_export:
1330         case T_wchar_t:
1331         case T_const:
1332         case T_signed:
1333         case T___real__:
1334         case T___imag__:
1335         case T_restrict:
1336         case T_volatile:
1337         case T_inline:
1338                 /* maybe we need more tokens ... add them on demand */
1339                 return get_token_symbol(&token);
1340         default:
1341                 return NULL;
1342         }
1343 }
1344
1345 static attribute_t *parse_attribute_gnu_single(void)
1346 {
1347         /* parse "any-word" */
1348         symbol_t *symbol = get_symbol_from_token();
1349         if (symbol == NULL) {
1350                 parse_error_expected("while parsing attribute((", T_IDENTIFIER, NULL);
1351                 goto end_error;
1352         }
1353
1354         const char *name = symbol->string;
1355         next_token();
1356
1357         attribute_kind_t kind;
1358         for (kind = ATTRIBUTE_GNU_FIRST; kind <= ATTRIBUTE_GNU_LAST; ++kind) {
1359                 const char *attribute_name = get_attribute_name(kind);
1360                 if (attribute_name != NULL
1361                                 && strcmp_underscore(attribute_name, name) == 0)
1362                         break;
1363         }
1364
1365         if (kind >= ATTRIBUTE_GNU_LAST) {
1366                 if (warning.attribute) {
1367                         warningf(HERE, "unknown attribute '%s' ignored", name);
1368                 }
1369                 /* TODO: we should still save the attribute in the list... */
1370                 kind = ATTRIBUTE_UNKNOWN;
1371         }
1372
1373         attribute_t *attribute = allocate_attribute_zero(kind);
1374
1375         /* parse arguments */
1376         if (token.type == '(') {
1377                 next_token();
1378                 attribute->a.arguments = parse_attribute_arguments();
1379         }
1380
1381         return attribute;
1382
1383 end_error:
1384         return NULL;
1385 }
1386
1387 static attribute_t *parse_attribute_gnu(void)
1388 {
1389         attribute_t *first = NULL;
1390         attribute_t *last  = NULL;
1391
1392         eat(T___attribute__);
1393         expect('(', end_error);
1394         expect('(', end_error);
1395
1396         if (token.type == ')') {
1397                 next_token();
1398                 expect(')', end_error);
1399                 return first;
1400         }
1401
1402         while (true) {
1403                 attribute_t *attribute = parse_attribute_gnu_single();
1404                 if (attribute == NULL)
1405                         goto end_error;
1406
1407                 if (last == NULL) {
1408                         first = attribute;
1409                 } else {
1410                         last->next = attribute;
1411                 }
1412                 last = attribute;
1413
1414                 if (token.type == ')') {
1415                         next_token();
1416                         break;
1417                 }
1418                 expect(',', end_error);
1419         }
1420         expect(')', end_error);
1421
1422 end_error:
1423         return first;
1424 }
1425
1426 /** Parse attributes. */
1427 static attribute_t *parse_attributes(attribute_t *first)
1428 {
1429         attribute_t *last = first;
1430         while (true) {
1431                 if (last != NULL) {
1432                         while (last->next != NULL)
1433                                 last = last->next;
1434                 }
1435
1436                 attribute_t *attribute;
1437                 switch (token.type) {
1438                 case T___attribute__:
1439                         attribute = parse_attribute_gnu();
1440                         break;
1441
1442                 case T_asm:
1443                         attribute = parse_attribute_asm();
1444                         break;
1445
1446                 case T_cdecl:
1447                         next_token();
1448                         attribute = allocate_attribute_zero(ATTRIBUTE_MS_CDECL);
1449                         break;
1450
1451                 case T__fastcall:
1452                         next_token();
1453                         attribute = allocate_attribute_zero(ATTRIBUTE_MS_FASTCALL);
1454                         break;
1455
1456                 case T__forceinline:
1457                         next_token();
1458                         attribute = allocate_attribute_zero(ATTRIBUTE_MS_FORCEINLINE);
1459                         break;
1460
1461                 case T__stdcall:
1462                         next_token();
1463                         attribute = allocate_attribute_zero(ATTRIBUTE_MS_STDCALL);
1464                         break;
1465
1466                 case T___thiscall:
1467                         next_token();
1468                         /* TODO record modifier */
1469                         if (warning.other)
1470                                 warningf(HERE, "Ignoring declaration modifier %K", &token);
1471                         attribute = allocate_attribute_zero(ATTRIBUTE_MS_THISCALL);
1472                         break;
1473
1474                 default:
1475                         return first;
1476                 }
1477
1478                 if (last == NULL) {
1479                         first = attribute;
1480                 } else {
1481                         last->next = attribute;
1482                 }
1483                 last = attribute;
1484         }
1485 }
1486
1487 static void mark_vars_read(expression_t *expr, entity_t *lhs_ent);
1488
1489 static entity_t *determine_lhs_ent(expression_t *const expr,
1490                                    entity_t *lhs_ent)
1491 {
1492         switch (expr->kind) {
1493                 case EXPR_REFERENCE: {
1494                         entity_t *const entity = expr->reference.entity;
1495                         /* we should only find variables as lvalues... */
1496                         if (entity->base.kind != ENTITY_VARIABLE
1497                                         && entity->base.kind != ENTITY_PARAMETER)
1498                                 return NULL;
1499
1500                         return entity;
1501                 }
1502
1503                 case EXPR_ARRAY_ACCESS: {
1504                         expression_t *const ref = expr->array_access.array_ref;
1505                         entity_t     *      ent = NULL;
1506                         if (is_type_array(skip_typeref(revert_automatic_type_conversion(ref)))) {
1507                                 ent     = determine_lhs_ent(ref, lhs_ent);
1508                                 lhs_ent = ent;
1509                         } else {
1510                                 mark_vars_read(expr->select.compound, lhs_ent);
1511                         }
1512                         mark_vars_read(expr->array_access.index, lhs_ent);
1513                         return ent;
1514                 }
1515
1516                 case EXPR_SELECT: {
1517                         if (is_type_compound(skip_typeref(expr->base.type))) {
1518                                 return determine_lhs_ent(expr->select.compound, lhs_ent);
1519                         } else {
1520                                 mark_vars_read(expr->select.compound, lhs_ent);
1521                                 return NULL;
1522                         }
1523                 }
1524
1525                 case EXPR_UNARY_DEREFERENCE: {
1526                         expression_t *const val = expr->unary.value;
1527                         if (val->kind == EXPR_UNARY_TAKE_ADDRESS) {
1528                                 /* *&x is a NOP */
1529                                 return determine_lhs_ent(val->unary.value, lhs_ent);
1530                         } else {
1531                                 mark_vars_read(val, NULL);
1532                                 return NULL;
1533                         }
1534                 }
1535
1536                 default:
1537                         mark_vars_read(expr, NULL);
1538                         return NULL;
1539         }
1540 }
1541
1542 #define ENT_ANY ((entity_t*)-1)
1543
1544 /**
1545  * Mark declarations, which are read.  This is used to detect variables, which
1546  * are never read.
1547  * Example:
1548  * x = x + 1;
1549  *   x is not marked as "read", because it is only read to calculate its own new
1550  *   value.
1551  *
1552  * x += y; y += x;
1553  *   x and y are not detected as "not read", because multiple variables are
1554  *   involved.
1555  */
1556 static void mark_vars_read(expression_t *const expr, entity_t *lhs_ent)
1557 {
1558         switch (expr->kind) {
1559                 case EXPR_REFERENCE: {
1560                         entity_t *const entity = expr->reference.entity;
1561                         if (entity->kind != ENTITY_VARIABLE
1562                                         && entity->kind != ENTITY_PARAMETER)
1563                                 return;
1564
1565                         if (lhs_ent != entity && lhs_ent != ENT_ANY) {
1566                                 if (entity->kind == ENTITY_VARIABLE) {
1567                                         entity->variable.read = true;
1568                                 } else {
1569                                         entity->parameter.read = true;
1570                                 }
1571                         }
1572                         return;
1573                 }
1574
1575                 case EXPR_CALL:
1576                         // TODO respect pure/const
1577                         mark_vars_read(expr->call.function, NULL);
1578                         for (call_argument_t *arg = expr->call.arguments; arg != NULL; arg = arg->next) {
1579                                 mark_vars_read(arg->expression, NULL);
1580                         }
1581                         return;
1582
1583                 case EXPR_CONDITIONAL:
1584                         // TODO lhs_decl should depend on whether true/false have an effect
1585                         mark_vars_read(expr->conditional.condition, NULL);
1586                         if (expr->conditional.true_expression != NULL)
1587                                 mark_vars_read(expr->conditional.true_expression, lhs_ent);
1588                         mark_vars_read(expr->conditional.false_expression, lhs_ent);
1589                         return;
1590
1591                 case EXPR_SELECT:
1592                         if (lhs_ent == ENT_ANY
1593                                         && !is_type_compound(skip_typeref(expr->base.type)))
1594                                 lhs_ent = NULL;
1595                         mark_vars_read(expr->select.compound, lhs_ent);
1596                         return;
1597
1598                 case EXPR_ARRAY_ACCESS: {
1599                         expression_t *const ref = expr->array_access.array_ref;
1600                         mark_vars_read(ref, lhs_ent);
1601                         lhs_ent = determine_lhs_ent(ref, lhs_ent);
1602                         mark_vars_read(expr->array_access.index, lhs_ent);
1603                         return;
1604                 }
1605
1606                 case EXPR_VA_ARG:
1607                         mark_vars_read(expr->va_arge.ap, lhs_ent);
1608                         return;
1609
1610                 case EXPR_VA_COPY:
1611                         mark_vars_read(expr->va_copye.src, lhs_ent);
1612                         return;
1613
1614                 case EXPR_UNARY_CAST:
1615                         /* Special case: Use void cast to mark a variable as "read" */
1616                         if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_VOID))
1617                                 lhs_ent = NULL;
1618                         goto unary;
1619
1620
1621                 case EXPR_UNARY_THROW:
1622                         if (expr->unary.value == NULL)
1623                                 return;
1624                         /* FALLTHROUGH */
1625                 case EXPR_UNARY_DEREFERENCE:
1626                 case EXPR_UNARY_DELETE:
1627                 case EXPR_UNARY_DELETE_ARRAY:
1628                         if (lhs_ent == ENT_ANY)
1629                                 lhs_ent = NULL;
1630                         goto unary;
1631
1632                 case EXPR_UNARY_NEGATE:
1633                 case EXPR_UNARY_PLUS:
1634                 case EXPR_UNARY_BITWISE_NEGATE:
1635                 case EXPR_UNARY_NOT:
1636                 case EXPR_UNARY_TAKE_ADDRESS:
1637                 case EXPR_UNARY_POSTFIX_INCREMENT:
1638                 case EXPR_UNARY_POSTFIX_DECREMENT:
1639                 case EXPR_UNARY_PREFIX_INCREMENT:
1640                 case EXPR_UNARY_PREFIX_DECREMENT:
1641                 case EXPR_UNARY_CAST_IMPLICIT:
1642                 case EXPR_UNARY_ASSUME:
1643 unary:
1644                         mark_vars_read(expr->unary.value, lhs_ent);
1645                         return;
1646
1647                 case EXPR_BINARY_ADD:
1648                 case EXPR_BINARY_SUB:
1649                 case EXPR_BINARY_MUL:
1650                 case EXPR_BINARY_DIV:
1651                 case EXPR_BINARY_MOD:
1652                 case EXPR_BINARY_EQUAL:
1653                 case EXPR_BINARY_NOTEQUAL:
1654                 case EXPR_BINARY_LESS:
1655                 case EXPR_BINARY_LESSEQUAL:
1656                 case EXPR_BINARY_GREATER:
1657                 case EXPR_BINARY_GREATEREQUAL:
1658                 case EXPR_BINARY_BITWISE_AND:
1659                 case EXPR_BINARY_BITWISE_OR:
1660                 case EXPR_BINARY_BITWISE_XOR:
1661                 case EXPR_BINARY_LOGICAL_AND:
1662                 case EXPR_BINARY_LOGICAL_OR:
1663                 case EXPR_BINARY_SHIFTLEFT:
1664                 case EXPR_BINARY_SHIFTRIGHT:
1665                 case EXPR_BINARY_COMMA:
1666                 case EXPR_BINARY_ISGREATER:
1667                 case EXPR_BINARY_ISGREATEREQUAL:
1668                 case EXPR_BINARY_ISLESS:
1669                 case EXPR_BINARY_ISLESSEQUAL:
1670                 case EXPR_BINARY_ISLESSGREATER:
1671                 case EXPR_BINARY_ISUNORDERED:
1672                         mark_vars_read(expr->binary.left,  lhs_ent);
1673                         mark_vars_read(expr->binary.right, lhs_ent);
1674                         return;
1675
1676                 case EXPR_BINARY_ASSIGN:
1677                 case EXPR_BINARY_MUL_ASSIGN:
1678                 case EXPR_BINARY_DIV_ASSIGN:
1679                 case EXPR_BINARY_MOD_ASSIGN:
1680                 case EXPR_BINARY_ADD_ASSIGN:
1681                 case EXPR_BINARY_SUB_ASSIGN:
1682                 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1683                 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1684                 case EXPR_BINARY_BITWISE_AND_ASSIGN:
1685                 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1686                 case EXPR_BINARY_BITWISE_OR_ASSIGN: {
1687                         if (lhs_ent == ENT_ANY)
1688                                 lhs_ent = NULL;
1689                         lhs_ent = determine_lhs_ent(expr->binary.left, lhs_ent);
1690                         mark_vars_read(expr->binary.right, lhs_ent);
1691                         return;
1692                 }
1693
1694                 case EXPR_VA_START:
1695                         determine_lhs_ent(expr->va_starte.ap, lhs_ent);
1696                         return;
1697
1698                 case EXPR_UNKNOWN:
1699                 case EXPR_INVALID:
1700                 case EXPR_CONST:
1701                 case EXPR_CHARACTER_CONSTANT:
1702                 case EXPR_WIDE_CHARACTER_CONSTANT:
1703                 case EXPR_STRING_LITERAL:
1704                 case EXPR_WIDE_STRING_LITERAL:
1705                 case EXPR_COMPOUND_LITERAL: // TODO init?
1706                 case EXPR_SIZEOF:
1707                 case EXPR_CLASSIFY_TYPE:
1708                 case EXPR_ALIGNOF:
1709                 case EXPR_FUNCNAME:
1710                 case EXPR_BUILTIN_CONSTANT_P:
1711                 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1712                 case EXPR_OFFSETOF:
1713                 case EXPR_STATEMENT: // TODO
1714                 case EXPR_LABEL_ADDRESS:
1715                 case EXPR_REFERENCE_ENUM_VALUE:
1716                         return;
1717         }
1718
1719         panic("unhandled expression");
1720 }
1721
1722 static designator_t *parse_designation(void)
1723 {
1724         designator_t *result = NULL;
1725         designator_t *last   = NULL;
1726
1727         while (true) {
1728                 designator_t *designator;
1729                 switch (token.type) {
1730                 case '[':
1731                         designator = allocate_ast_zero(sizeof(designator[0]));
1732                         designator->source_position = token.source_position;
1733                         next_token();
1734                         add_anchor_token(']');
1735                         designator->array_index = parse_constant_expression();
1736                         rem_anchor_token(']');
1737                         expect(']', end_error);
1738                         break;
1739                 case '.':
1740                         designator = allocate_ast_zero(sizeof(designator[0]));
1741                         designator->source_position = token.source_position;
1742                         next_token();
1743                         if (token.type != T_IDENTIFIER) {
1744                                 parse_error_expected("while parsing designator",
1745                                                      T_IDENTIFIER, NULL);
1746                                 return NULL;
1747                         }
1748                         designator->symbol = token.v.symbol;
1749                         next_token();
1750                         break;
1751                 default:
1752                         expect('=', end_error);
1753                         return result;
1754                 }
1755
1756                 assert(designator != NULL);
1757                 if (last != NULL) {
1758                         last->next = designator;
1759                 } else {
1760                         result = designator;
1761                 }
1762                 last = designator;
1763         }
1764 end_error:
1765         return NULL;
1766 }
1767
1768 static initializer_t *initializer_from_string(array_type_t *type,
1769                                               const string_t *const string)
1770 {
1771         /* TODO: check len vs. size of array type */
1772         (void) type;
1773
1774         initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1775         initializer->string.string = *string;
1776
1777         return initializer;
1778 }
1779
1780 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1781                                                    wide_string_t *const string)
1782 {
1783         /* TODO: check len vs. size of array type */
1784         (void) type;
1785
1786         initializer_t *const initializer =
1787                 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1788         initializer->wide_string.string = *string;
1789
1790         return initializer;
1791 }
1792
1793 /**
1794  * Build an initializer from a given expression.
1795  */
1796 static initializer_t *initializer_from_expression(type_t *orig_type,
1797                                                   expression_t *expression)
1798 {
1799         /* TODO check that expression is a constant expression */
1800
1801         /* §6.7.8.14/15 char array may be initialized by string literals */
1802         type_t *type           = skip_typeref(orig_type);
1803         type_t *expr_type_orig = expression->base.type;
1804         type_t *expr_type      = skip_typeref(expr_type_orig);
1805         if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1806                 array_type_t *const array_type   = &type->array;
1807                 type_t       *const element_type = skip_typeref(array_type->element_type);
1808
1809                 if (element_type->kind == TYPE_ATOMIC) {
1810                         atomic_type_kind_t akind = element_type->atomic.akind;
1811                         switch (expression->kind) {
1812                                 case EXPR_STRING_LITERAL:
1813                                         if (akind == ATOMIC_TYPE_CHAR
1814                                                         || akind == ATOMIC_TYPE_SCHAR
1815                                                         || akind == ATOMIC_TYPE_UCHAR) {
1816                                                 return initializer_from_string(array_type,
1817                                                         &expression->string.value);
1818                                         }
1819                                         break;
1820
1821                                 case EXPR_WIDE_STRING_LITERAL: {
1822                                         type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1823                                         if (get_unqualified_type(element_type) == bare_wchar_type) {
1824                                                 return initializer_from_wide_string(array_type,
1825                                                         &expression->wide_string.value);
1826                                         }
1827                                         break;
1828                                 }
1829
1830                                 default:
1831                                         break;
1832                         }
1833                 }
1834         }
1835
1836         assign_error_t error = semantic_assign(type, expression);
1837         if (error == ASSIGN_ERROR_INCOMPATIBLE)
1838                 return NULL;
1839         report_assign_error(error, type, expression, "initializer",
1840                             &expression->base.source_position);
1841
1842         initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1843         result->value.value = create_implicit_cast(expression, type);
1844
1845         return result;
1846 }
1847
1848 /**
1849  * Checks if a given expression can be used as an constant initializer.
1850  */
1851 static bool is_initializer_constant(const expression_t *expression)
1852 {
1853         return is_constant_expression(expression)
1854                 || is_address_constant(expression);
1855 }
1856
1857 /**
1858  * Parses an scalar initializer.
1859  *
1860  * §6.7.8.11; eat {} without warning
1861  */
1862 static initializer_t *parse_scalar_initializer(type_t *type,
1863                                                bool must_be_constant)
1864 {
1865         /* there might be extra {} hierarchies */
1866         int braces = 0;
1867         if (token.type == '{') {
1868                 if (warning.other)
1869                         warningf(HERE, "extra curly braces around scalar initializer");
1870                 do {
1871                         ++braces;
1872                         next_token();
1873                 } while (token.type == '{');
1874         }
1875
1876         expression_t *expression = parse_assignment_expression();
1877         mark_vars_read(expression, NULL);
1878         if (must_be_constant && !is_initializer_constant(expression)) {
1879                 errorf(&expression->base.source_position,
1880                        "initialisation expression '%E' is not constant",
1881                        expression);
1882         }
1883
1884         initializer_t *initializer = initializer_from_expression(type, expression);
1885
1886         if (initializer == NULL) {
1887                 errorf(&expression->base.source_position,
1888                        "expression '%E' (type '%T') doesn't match expected type '%T'",
1889                        expression, expression->base.type, type);
1890                 /* TODO */
1891                 return NULL;
1892         }
1893
1894         bool additional_warning_displayed = false;
1895         while (braces > 0) {
1896                 if (token.type == ',') {
1897                         next_token();
1898                 }
1899                 if (token.type != '}') {
1900                         if (!additional_warning_displayed && warning.other) {
1901                                 warningf(HERE, "additional elements in scalar initializer");
1902                                 additional_warning_displayed = true;
1903                         }
1904                 }
1905                 eat_block();
1906                 braces--;
1907         }
1908
1909         return initializer;
1910 }
1911
1912 /**
1913  * An entry in the type path.
1914  */
1915 typedef struct type_path_entry_t type_path_entry_t;
1916 struct type_path_entry_t {
1917         type_t *type;       /**< the upper top type. restored to path->top_tye if this entry is popped. */
1918         union {
1919                 size_t         index;          /**< For array types: the current index. */
1920                 declaration_t *compound_entry; /**< For compound types: the current declaration. */
1921         } v;
1922 };
1923
1924 /**
1925  * A type path expression a position inside compound or array types.
1926  */
1927 typedef struct type_path_t type_path_t;
1928 struct type_path_t {
1929         type_path_entry_t *path;         /**< An flexible array containing the current path. */
1930         type_t            *top_type;     /**< type of the element the path points */
1931         size_t             max_index;    /**< largest index in outermost array */
1932 };
1933
1934 /**
1935  * Prints a type path for debugging.
1936  */
1937 static __attribute__((unused)) void debug_print_type_path(
1938                 const type_path_t *path)
1939 {
1940         size_t len = ARR_LEN(path->path);
1941
1942         for (size_t i = 0; i < len; ++i) {
1943                 const type_path_entry_t *entry = & path->path[i];
1944
1945                 type_t *type = skip_typeref(entry->type);
1946                 if (is_type_compound(type)) {
1947                         /* in gcc mode structs can have no members */
1948                         if (entry->v.compound_entry == NULL) {
1949                                 assert(i == len-1);
1950                                 continue;
1951                         }
1952                         fprintf(stderr, ".%s",
1953                                 entry->v.compound_entry->base.symbol->string);
1954                 } else if (is_type_array(type)) {
1955                         fprintf(stderr, "[%u]", (unsigned) entry->v.index);
1956                 } else {
1957                         fprintf(stderr, "-INVALID-");
1958                 }
1959         }
1960         if (path->top_type != NULL) {
1961                 fprintf(stderr, "  (");
1962                 print_type(path->top_type);
1963                 fprintf(stderr, ")");
1964         }
1965 }
1966
1967 /**
1968  * Return the top type path entry, ie. in a path
1969  * (type).a.b returns the b.
1970  */
1971 static type_path_entry_t *get_type_path_top(const type_path_t *path)
1972 {
1973         size_t len = ARR_LEN(path->path);
1974         assert(len > 0);
1975         return &path->path[len-1];
1976 }
1977
1978 /**
1979  * Enlarge the type path by an (empty) element.
1980  */
1981 static type_path_entry_t *append_to_type_path(type_path_t *path)
1982 {
1983         size_t len = ARR_LEN(path->path);
1984         ARR_RESIZE(type_path_entry_t, path->path, len+1);
1985
1986         type_path_entry_t *result = & path->path[len];
1987         memset(result, 0, sizeof(result[0]));
1988         return result;
1989 }
1990
1991 /**
1992  * Descending into a sub-type. Enter the scope of the current top_type.
1993  */
1994 static void descend_into_subtype(type_path_t *path)
1995 {
1996         type_t *orig_top_type = path->top_type;
1997         type_t *top_type      = skip_typeref(orig_top_type);
1998
1999         type_path_entry_t *top = append_to_type_path(path);
2000         top->type              = top_type;
2001
2002         if (is_type_compound(top_type)) {
2003                 compound_t *compound  = top_type->compound.compound;
2004                 entity_t   *entry     = compound->members.entities;
2005
2006                 if (entry != NULL) {
2007                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2008                         top->v.compound_entry = &entry->declaration;
2009                         path->top_type = entry->declaration.type;
2010                 } else {
2011                         path->top_type = NULL;
2012                 }
2013         } else if (is_type_array(top_type)) {
2014                 top->v.index   = 0;
2015                 path->top_type = top_type->array.element_type;
2016         } else {
2017                 assert(!is_type_valid(top_type));
2018         }
2019 }
2020
2021 /**
2022  * Pop an entry from the given type path, ie. returning from
2023  * (type).a.b to (type).a
2024  */
2025 static void ascend_from_subtype(type_path_t *path)
2026 {
2027         type_path_entry_t *top = get_type_path_top(path);
2028
2029         path->top_type = top->type;
2030
2031         size_t len = ARR_LEN(path->path);
2032         ARR_RESIZE(type_path_entry_t, path->path, len-1);
2033 }
2034
2035 /**
2036  * Pop entries from the given type path until the given
2037  * path level is reached.
2038  */
2039 static void ascend_to(type_path_t *path, size_t top_path_level)
2040 {
2041         size_t len = ARR_LEN(path->path);
2042
2043         while (len > top_path_level) {
2044                 ascend_from_subtype(path);
2045                 len = ARR_LEN(path->path);
2046         }
2047 }
2048
2049 static bool walk_designator(type_path_t *path, const designator_t *designator,
2050                             bool used_in_offsetof)
2051 {
2052         for (; designator != NULL; designator = designator->next) {
2053                 type_path_entry_t *top       = get_type_path_top(path);
2054                 type_t            *orig_type = top->type;
2055
2056                 type_t *type = skip_typeref(orig_type);
2057
2058                 if (designator->symbol != NULL) {
2059                         symbol_t *symbol = designator->symbol;
2060                         if (!is_type_compound(type)) {
2061                                 if (is_type_valid(type)) {
2062                                         errorf(&designator->source_position,
2063                                                "'.%Y' designator used for non-compound type '%T'",
2064                                                symbol, orig_type);
2065                                 }
2066
2067                                 top->type             = type_error_type;
2068                                 top->v.compound_entry = NULL;
2069                                 orig_type             = type_error_type;
2070                         } else {
2071                                 compound_t *compound = type->compound.compound;
2072                                 entity_t   *iter     = compound->members.entities;
2073                                 for (; iter != NULL; iter = iter->base.next) {
2074                                         if (iter->base.symbol == symbol) {
2075                                                 break;
2076                                         }
2077                                 }
2078                                 if (iter == NULL) {
2079                                         errorf(&designator->source_position,
2080                                                "'%T' has no member named '%Y'", orig_type, symbol);
2081                                         goto failed;
2082                                 }
2083                                 assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2084                                 if (used_in_offsetof) {
2085                                         type_t *real_type = skip_typeref(iter->declaration.type);
2086                                         if (real_type->kind == TYPE_BITFIELD) {
2087                                                 errorf(&designator->source_position,
2088                                                        "offsetof designator '%Y' may not specify bitfield",
2089                                                        symbol);
2090                                                 goto failed;
2091                                         }
2092                                 }
2093
2094                                 top->type             = orig_type;
2095                                 top->v.compound_entry = &iter->declaration;
2096                                 orig_type             = iter->declaration.type;
2097                         }
2098                 } else {
2099                         expression_t *array_index = designator->array_index;
2100                         assert(designator->array_index != NULL);
2101
2102                         if (!is_type_array(type)) {
2103                                 if (is_type_valid(type)) {
2104                                         errorf(&designator->source_position,
2105                                                "[%E] designator used for non-array type '%T'",
2106                                                array_index, orig_type);
2107                                 }
2108                                 goto failed;
2109                         }
2110
2111                         long index = fold_constant_to_int(array_index);
2112                         if (!used_in_offsetof) {
2113                                 if (index < 0) {
2114                                         errorf(&designator->source_position,
2115                                                "array index [%E] must be positive", array_index);
2116                                 } else if (type->array.size_constant) {
2117                                         long array_size = type->array.size;
2118                                         if (index >= array_size) {
2119                                                 errorf(&designator->source_position,
2120                                                        "designator [%E] (%d) exceeds array size %d",
2121                                                        array_index, index, array_size);
2122                                         }
2123                                 }
2124                         }
2125
2126                         top->type    = orig_type;
2127                         top->v.index = (size_t) index;
2128                         orig_type    = type->array.element_type;
2129                 }
2130                 path->top_type = orig_type;
2131
2132                 if (designator->next != NULL) {
2133                         descend_into_subtype(path);
2134                 }
2135         }
2136         return true;
2137
2138 failed:
2139         return false;
2140 }
2141
2142 static void advance_current_object(type_path_t *path, size_t top_path_level)
2143 {
2144         type_path_entry_t *top = get_type_path_top(path);
2145
2146         type_t *type = skip_typeref(top->type);
2147         if (is_type_union(type)) {
2148                 /* in unions only the first element is initialized */
2149                 top->v.compound_entry = NULL;
2150         } else if (is_type_struct(type)) {
2151                 declaration_t *entry = top->v.compound_entry;
2152
2153                 entity_t *next_entity = entry->base.next;
2154                 if (next_entity != NULL) {
2155                         assert(is_declaration(next_entity));
2156                         entry = &next_entity->declaration;
2157                 } else {
2158                         entry = NULL;
2159                 }
2160
2161                 top->v.compound_entry = entry;
2162                 if (entry != NULL) {
2163                         path->top_type = entry->type;
2164                         return;
2165                 }
2166         } else if (is_type_array(type)) {
2167                 assert(is_type_array(type));
2168
2169                 top->v.index++;
2170
2171                 if (!type->array.size_constant || top->v.index < type->array.size) {
2172                         return;
2173                 }
2174         } else {
2175                 assert(!is_type_valid(type));
2176                 return;
2177         }
2178
2179         /* we're past the last member of the current sub-aggregate, try if we
2180          * can ascend in the type hierarchy and continue with another subobject */
2181         size_t len = ARR_LEN(path->path);
2182
2183         if (len > top_path_level) {
2184                 ascend_from_subtype(path);
2185                 advance_current_object(path, top_path_level);
2186         } else {
2187                 path->top_type = NULL;
2188         }
2189 }
2190
2191 /**
2192  * skip any {...} blocks until a closing bracket is reached.
2193  */
2194 static void skip_initializers(void)
2195 {
2196         if (token.type == '{')
2197                 next_token();
2198
2199         while (token.type != '}') {
2200                 if (token.type == T_EOF)
2201                         return;
2202                 if (token.type == '{') {
2203                         eat_block();
2204                         continue;
2205                 }
2206                 next_token();
2207         }
2208 }
2209
2210 static initializer_t *create_empty_initializer(void)
2211 {
2212         static initializer_t empty_initializer
2213                 = { .list = { { INITIALIZER_LIST }, 0 } };
2214         return &empty_initializer;
2215 }
2216
2217 /**
2218  * Parse a part of an initialiser for a struct or union,
2219  */
2220 static initializer_t *parse_sub_initializer(type_path_t *path,
2221                 type_t *outer_type, size_t top_path_level,
2222                 parse_initializer_env_t *env)
2223 {
2224         if (token.type == '}') {
2225                 /* empty initializer */
2226                 return create_empty_initializer();
2227         }
2228
2229         type_t *orig_type = path->top_type;
2230         type_t *type      = NULL;
2231
2232         if (orig_type == NULL) {
2233                 /* We are initializing an empty compound. */
2234         } else {
2235                 type = skip_typeref(orig_type);
2236         }
2237
2238         initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2239
2240         while (true) {
2241                 designator_t *designator = NULL;
2242                 if (token.type == '.' || token.type == '[') {
2243                         designator = parse_designation();
2244                         goto finish_designator;
2245                 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2246                         /* GNU-style designator ("identifier: value") */
2247                         designator = allocate_ast_zero(sizeof(designator[0]));
2248                         designator->source_position = token.source_position;
2249                         designator->symbol          = token.v.symbol;
2250                         eat(T_IDENTIFIER);
2251                         eat(':');
2252
2253 finish_designator:
2254                         /* reset path to toplevel, evaluate designator from there */
2255                         ascend_to(path, top_path_level);
2256                         if (!walk_designator(path, designator, false)) {
2257                                 /* can't continue after designation error */
2258                                 goto end_error;
2259                         }
2260
2261                         initializer_t *designator_initializer
2262                                 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2263                         designator_initializer->designator.designator = designator;
2264                         ARR_APP1(initializer_t*, initializers, designator_initializer);
2265
2266                         orig_type = path->top_type;
2267                         type      = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2268                 }
2269
2270                 initializer_t *sub;
2271
2272                 if (token.type == '{') {
2273                         if (type != NULL && is_type_scalar(type)) {
2274                                 sub = parse_scalar_initializer(type, env->must_be_constant);
2275                         } else {
2276                                 eat('{');
2277                                 if (type == NULL) {
2278                                         if (env->entity != NULL) {
2279                                                 errorf(HERE,
2280                                                      "extra brace group at end of initializer for '%Y'",
2281                                                      env->entity->base.symbol);
2282                                         } else {
2283                                                 errorf(HERE, "extra brace group at end of initializer");
2284                                         }
2285                                 } else
2286                                         descend_into_subtype(path);
2287
2288                                 add_anchor_token('}');
2289                                 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2290                                                             env);
2291                                 rem_anchor_token('}');
2292
2293                                 if (type != NULL) {
2294                                         ascend_from_subtype(path);
2295                                         expect('}', end_error);
2296                                 } else {
2297                                         expect('}', end_error);
2298                                         goto error_parse_next;
2299                                 }
2300                         }
2301                 } else {
2302                         /* must be an expression */
2303                         expression_t *expression = parse_assignment_expression();
2304                         mark_vars_read(expression, NULL);
2305
2306                         if (env->must_be_constant && !is_initializer_constant(expression)) {
2307                                 errorf(&expression->base.source_position,
2308                                        "Initialisation expression '%E' is not constant",
2309                                        expression);
2310                         }
2311
2312                         if (type == NULL) {
2313                                 /* we are already outside, ... */
2314                                 if (outer_type == NULL)
2315                                         goto error_parse_next;
2316                                 type_t *const outer_type_skip = skip_typeref(outer_type);
2317                                 if (is_type_compound(outer_type_skip) &&
2318                                     !outer_type_skip->compound.compound->complete) {
2319                                         goto error_parse_next;
2320                                 }
2321                                 goto error_excess;
2322                         }
2323
2324                         /* handle { "string" } special case */
2325                         if ((expression->kind == EXPR_STRING_LITERAL
2326                                         || expression->kind == EXPR_WIDE_STRING_LITERAL)
2327                                         && outer_type != NULL) {
2328                                 sub = initializer_from_expression(outer_type, expression);
2329                                 if (sub != NULL) {
2330                                         if (token.type == ',') {
2331                                                 next_token();
2332                                         }
2333                                         if (token.type != '}' && warning.other) {
2334                                                 warningf(HERE, "excessive elements in initializer for type '%T'",
2335                                                                  orig_type);
2336                                         }
2337                                         /* TODO: eat , ... */
2338                                         return sub;
2339                                 }
2340                         }
2341
2342                         /* descend into subtypes until expression matches type */
2343                         while (true) {
2344                                 orig_type = path->top_type;
2345                                 type      = skip_typeref(orig_type);
2346
2347                                 sub = initializer_from_expression(orig_type, expression);
2348                                 if (sub != NULL) {
2349                                         break;
2350                                 }
2351                                 if (!is_type_valid(type)) {
2352                                         goto end_error;
2353                                 }
2354                                 if (is_type_scalar(type)) {
2355                                         errorf(&expression->base.source_position,
2356                                                         "expression '%E' doesn't match expected type '%T'",
2357                                                         expression, orig_type);
2358                                         goto end_error;
2359                                 }
2360
2361                                 descend_into_subtype(path);
2362                         }
2363                 }
2364
2365                 /* update largest index of top array */
2366                 const type_path_entry_t *first      = &path->path[0];
2367                 type_t                  *first_type = first->type;
2368                 first_type                          = skip_typeref(first_type);
2369                 if (is_type_array(first_type)) {
2370                         size_t index = first->v.index;
2371                         if (index > path->max_index)
2372                                 path->max_index = index;
2373                 }
2374
2375                 if (type != NULL) {
2376                         /* append to initializers list */
2377                         ARR_APP1(initializer_t*, initializers, sub);
2378                 } else {
2379 error_excess:
2380                         if (warning.other) {
2381                                 if (env->entity != NULL) {
2382                                         warningf(HERE, "excess elements in initializer for '%Y'",
2383                                                  env->entity->base.symbol);
2384                                 } else {
2385                                         warningf(HERE, "excess elements in initializer");
2386                                 }
2387                         }
2388                 }
2389
2390 error_parse_next:
2391                 if (token.type == '}') {
2392                         break;
2393                 }
2394                 expect(',', end_error);
2395                 if (token.type == '}') {
2396                         break;
2397                 }
2398
2399                 if (type != NULL) {
2400                         /* advance to the next declaration if we are not at the end */
2401                         advance_current_object(path, top_path_level);
2402                         orig_type = path->top_type;
2403                         if (orig_type != NULL)
2404                                 type = skip_typeref(orig_type);
2405                         else
2406                                 type = NULL;
2407                 }
2408         }
2409
2410         size_t len  = ARR_LEN(initializers);
2411         size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2412         initializer_t *result = allocate_ast_zero(size);
2413         result->kind          = INITIALIZER_LIST;
2414         result->list.len      = len;
2415         memcpy(&result->list.initializers, initializers,
2416                len * sizeof(initializers[0]));
2417
2418         DEL_ARR_F(initializers);
2419         ascend_to(path, top_path_level+1);
2420
2421         return result;
2422
2423 end_error:
2424         skip_initializers();
2425         DEL_ARR_F(initializers);
2426         ascend_to(path, top_path_level+1);
2427         return NULL;
2428 }
2429
2430 /**
2431  * Parses an initializer. Parsers either a compound literal
2432  * (env->declaration == NULL) or an initializer of a declaration.
2433  */
2434 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2435 {
2436         type_t        *type      = skip_typeref(env->type);
2437         size_t         max_index = 0xdeadbeaf;   // TODO: Resolve this uninitialized variable problem
2438         initializer_t *result;
2439
2440         if (is_type_scalar(type)) {
2441                 result = parse_scalar_initializer(type, env->must_be_constant);
2442         } else if (token.type == '{') {
2443                 eat('{');
2444
2445                 type_path_t path;
2446                 memset(&path, 0, sizeof(path));
2447                 path.top_type = env->type;
2448                 path.path     = NEW_ARR_F(type_path_entry_t, 0);
2449
2450                 descend_into_subtype(&path);
2451
2452                 add_anchor_token('}');
2453                 result = parse_sub_initializer(&path, env->type, 1, env);
2454                 rem_anchor_token('}');
2455
2456                 max_index = path.max_index;
2457                 DEL_ARR_F(path.path);
2458
2459                 expect('}', end_error);
2460         } else {
2461                 /* parse_scalar_initializer() also works in this case: we simply
2462                  * have an expression without {} around it */
2463                 result = parse_scalar_initializer(type, env->must_be_constant);
2464         }
2465
2466         /* §6.7.8:22 array initializers for arrays with unknown size determine
2467          * the array type size */
2468         if (is_type_array(type) && type->array.size_expression == NULL
2469                         && result != NULL) {
2470                 size_t size;
2471                 switch (result->kind) {
2472                 case INITIALIZER_LIST:
2473                         assert(max_index != 0xdeadbeaf);
2474                         size = max_index + 1;
2475                         break;
2476
2477                 case INITIALIZER_STRING:
2478                         size = result->string.string.size;
2479                         break;
2480
2481                 case INITIALIZER_WIDE_STRING:
2482                         size = result->wide_string.string.size;
2483                         break;
2484
2485                 case INITIALIZER_DESIGNATOR:
2486                 case INITIALIZER_VALUE:
2487                         /* can happen for parse errors */
2488                         size = 0;
2489                         break;
2490
2491                 default:
2492                         internal_errorf(HERE, "invalid initializer type");
2493                 }
2494
2495                 expression_t *cnst       = allocate_expression_zero(EXPR_CONST);
2496                 cnst->base.type          = type_size_t;
2497                 cnst->conste.v.int_value = size;
2498
2499                 type_t *new_type = duplicate_type(type);
2500
2501                 new_type->array.size_expression   = cnst;
2502                 new_type->array.size_constant     = true;
2503                 new_type->array.has_implicit_size = true;
2504                 new_type->array.size              = size;
2505                 env->type = new_type;
2506         }
2507
2508         return result;
2509 end_error:
2510         return NULL;
2511 }
2512
2513 static void append_entity(scope_t *scope, entity_t *entity)
2514 {
2515         if (scope->last_entity != NULL) {
2516                 scope->last_entity->base.next = entity;
2517         } else {
2518                 scope->entities = entity;
2519         }
2520         scope->last_entity = entity;
2521 }
2522
2523
2524 static compound_t *parse_compound_type_specifier(bool is_struct)
2525 {
2526         eat(is_struct ? T_struct : T_union);
2527
2528         symbol_t    *symbol   = NULL;
2529         compound_t  *compound = NULL;
2530         attribute_t *attributes = NULL;
2531
2532         if (token.type == T___attribute__) {
2533                 attributes = parse_attributes(NULL);
2534         }
2535
2536         entity_kind_tag_t const kind = is_struct ? ENTITY_STRUCT : ENTITY_UNION;
2537         if (token.type == T_IDENTIFIER) {
2538                 /* the compound has a name, check if we have seen it already */
2539                 symbol = token.v.symbol;
2540                 next_token();
2541
2542                 entity_t *entity = get_tag(symbol, kind);
2543                 if (entity != NULL) {
2544                         compound = &entity->compound;
2545                         if (compound->base.parent_scope != current_scope &&
2546                             (token.type == '{' || token.type == ';')) {
2547                                 /* we're in an inner scope and have a definition. Shadow
2548                                  * existing definition in outer scope */
2549                                 compound = NULL;
2550                         } else if (compound->complete && token.type == '{') {
2551                                 assert(symbol != NULL);
2552                                 errorf(HERE, "multiple definitions of '%s %Y' (previous definition %P)",
2553                                        is_struct ? "struct" : "union", symbol,
2554                                        &compound->base.source_position);
2555                                 /* clear members in the hope to avoid further errors */
2556                                 compound->members.entities = NULL;
2557                         }
2558                 }
2559         } else if (token.type != '{') {
2560                 if (is_struct) {
2561                         parse_error_expected("while parsing struct type specifier",
2562                                              T_IDENTIFIER, '{', NULL);
2563                 } else {
2564                         parse_error_expected("while parsing union type specifier",
2565                                              T_IDENTIFIER, '{', NULL);
2566                 }
2567
2568                 return NULL;
2569         }
2570
2571         if (compound == NULL) {
2572                 entity_t *entity = allocate_entity_zero(kind);
2573                 compound         = &entity->compound;
2574
2575                 compound->alignment            = 1;
2576                 compound->base.namespc         = NAMESPACE_TAG;
2577                 compound->base.source_position = token.source_position;
2578                 compound->base.symbol          = symbol;
2579                 compound->base.parent_scope    = current_scope;
2580                 if (symbol != NULL) {
2581                         environment_push(entity);
2582                 }
2583                 append_entity(current_scope, entity);
2584         }
2585
2586         if (token.type == '{') {
2587                 parse_compound_type_entries(compound);
2588
2589                 /* ISO/IEC 14882:1998(E) §7.1.3:5 */
2590                 if (symbol == NULL) {
2591                         assert(anonymous_entity == NULL);
2592                         anonymous_entity = (entity_t*)compound;
2593                 }
2594         }
2595
2596         if (attributes != NULL) {
2597                 handle_entity_attributes(attributes, (entity_t*) compound);
2598         }
2599
2600         return compound;
2601 }
2602
2603 static void parse_enum_entries(type_t *const enum_type)
2604 {
2605         eat('{');
2606
2607         if (token.type == '}') {
2608                 errorf(HERE, "empty enum not allowed");
2609                 next_token();
2610                 return;
2611         }
2612
2613         add_anchor_token('}');
2614         do {
2615                 if (token.type != T_IDENTIFIER) {
2616                         parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2617                         eat_block();
2618                         rem_anchor_token('}');
2619                         return;
2620                 }
2621
2622                 entity_t *entity             = allocate_entity_zero(ENTITY_ENUM_VALUE);
2623                 entity->enum_value.enum_type = enum_type;
2624                 entity->base.symbol          = token.v.symbol;
2625                 entity->base.source_position = token.source_position;
2626                 next_token();
2627
2628                 if (token.type == '=') {
2629                         next_token();
2630                         expression_t *value = parse_constant_expression();
2631
2632                         value = create_implicit_cast(value, enum_type);
2633                         entity->enum_value.value = value;
2634
2635                         /* TODO semantic */
2636                 }
2637
2638                 record_entity(entity, false);
2639
2640                 if (token.type != ',')
2641                         break;
2642                 next_token();
2643         } while (token.type != '}');
2644         rem_anchor_token('}');
2645
2646         expect('}', end_error);
2647
2648 end_error:
2649         ;
2650 }
2651
2652 static type_t *parse_enum_specifier(void)
2653 {
2654         entity_t        *entity;
2655         symbol_t        *symbol;
2656
2657         eat(T_enum);
2658         if (token.type == T_IDENTIFIER) {
2659                 symbol = token.v.symbol;
2660                 next_token();
2661
2662                 entity = get_tag(symbol, ENTITY_ENUM);
2663                 if (entity != NULL) {
2664                         if (entity->base.parent_scope != current_scope &&
2665                                         (token.type == '{' || token.type == ';')) {
2666                                 /* we're in an inner scope and have a definition. Shadow
2667                                  * existing definition in outer scope */
2668                                 entity = NULL;
2669                         } else if (entity->enume.complete && token.type == '{') {
2670                                 errorf(HERE, "multiple definitions of 'enum %Y' (previous definition %P)",
2671                                                 symbol, &entity->base.source_position);
2672                         }
2673                 }
2674         } else if (token.type != '{') {
2675                 parse_error_expected("while parsing enum type specifier",
2676                                      T_IDENTIFIER, '{', NULL);
2677                 return NULL;
2678         } else {
2679                 entity  = NULL;
2680                 symbol  = NULL;
2681         }
2682
2683         if (entity == NULL) {
2684                 entity                       = allocate_entity_zero(ENTITY_ENUM);
2685                 entity->base.namespc         = NAMESPACE_TAG;
2686                 entity->base.source_position = token.source_position;
2687                 entity->base.symbol          = symbol;
2688                 entity->base.parent_scope    = current_scope;
2689         }
2690
2691         type_t *const type = allocate_type_zero(TYPE_ENUM);
2692         type->enumt.enume  = &entity->enume;
2693         type->enumt.akind  = ATOMIC_TYPE_INT;
2694
2695         if (token.type == '{') {
2696                 if (symbol != NULL) {
2697                         environment_push(entity);
2698                 }
2699                 append_entity(current_scope, entity);
2700                 entity->enume.complete = true;
2701
2702                 parse_enum_entries(type);
2703                 parse_attributes(NULL);
2704
2705                 /* ISO/IEC 14882:1998(E) §7.1.3:5 */
2706                 if (symbol == NULL) {
2707                         assert(anonymous_entity == NULL);
2708                         anonymous_entity = entity;
2709                 }
2710         } else if (!entity->enume.complete && !(c_mode & _GNUC)) {
2711                 errorf(HERE, "'enum %Y' used before definition (incomplete enums are a GNU extension)",
2712                        symbol);
2713         }
2714
2715         return type;
2716 }
2717
2718 /**
2719  * if a symbol is a typedef to another type, return true
2720  */
2721 static bool is_typedef_symbol(symbol_t *symbol)
2722 {
2723         const entity_t *const entity = get_entity(symbol, NAMESPACE_NORMAL);
2724         return entity != NULL && entity->kind == ENTITY_TYPEDEF;
2725 }
2726
2727 static type_t *parse_typeof(void)
2728 {
2729         eat(T___typeof__);
2730
2731         type_t *type;
2732
2733         expect('(', end_error);
2734         add_anchor_token(')');
2735
2736         expression_t *expression  = NULL;
2737
2738         bool old_type_prop     = in_type_prop;
2739         bool old_gcc_extension = in_gcc_extension;
2740         in_type_prop           = true;
2741
2742         while (token.type == T___extension__) {
2743                 /* This can be a prefix to a typename or an expression. */
2744                 next_token();
2745                 in_gcc_extension = true;
2746         }
2747         switch (token.type) {
2748         case T_IDENTIFIER:
2749                 if (is_typedef_symbol(token.v.symbol)) {
2750                         type = parse_typename();
2751                 } else {
2752                         expression = parse_expression();
2753                         type       = revert_automatic_type_conversion(expression);
2754                 }
2755                 break;
2756
2757         TYPENAME_START
2758                 type = parse_typename();
2759                 break;
2760
2761         default:
2762                 expression = parse_expression();
2763                 type       = expression->base.type;
2764                 break;
2765         }
2766         in_type_prop     = old_type_prop;
2767         in_gcc_extension = old_gcc_extension;
2768
2769         rem_anchor_token(')');
2770         expect(')', end_error);
2771
2772         type_t *typeof_type              = allocate_type_zero(TYPE_TYPEOF);
2773         typeof_type->typeoft.expression  = expression;
2774         typeof_type->typeoft.typeof_type = type;
2775
2776         return typeof_type;
2777 end_error:
2778         return NULL;
2779 }
2780
2781 typedef enum specifiers_t {
2782         SPECIFIER_SIGNED    = 1 << 0,
2783         SPECIFIER_UNSIGNED  = 1 << 1,
2784         SPECIFIER_LONG      = 1 << 2,
2785         SPECIFIER_INT       = 1 << 3,
2786         SPECIFIER_DOUBLE    = 1 << 4,
2787         SPECIFIER_CHAR      = 1 << 5,
2788         SPECIFIER_WCHAR_T   = 1 << 6,
2789         SPECIFIER_SHORT     = 1 << 7,
2790         SPECIFIER_LONG_LONG = 1 << 8,
2791         SPECIFIER_FLOAT     = 1 << 9,
2792         SPECIFIER_BOOL      = 1 << 10,
2793         SPECIFIER_VOID      = 1 << 11,
2794         SPECIFIER_INT8      = 1 << 12,
2795         SPECIFIER_INT16     = 1 << 13,
2796         SPECIFIER_INT32     = 1 << 14,
2797         SPECIFIER_INT64     = 1 << 15,
2798         SPECIFIER_INT128    = 1 << 16,
2799         SPECIFIER_COMPLEX   = 1 << 17,
2800         SPECIFIER_IMAGINARY = 1 << 18,
2801 } specifiers_t;
2802
2803 static type_t *create_builtin_type(symbol_t *const symbol,
2804                                    type_t *const real_type)
2805 {
2806         type_t *type            = allocate_type_zero(TYPE_BUILTIN);
2807         type->builtin.symbol    = symbol;
2808         type->builtin.real_type = real_type;
2809         return identify_new_type(type);
2810 }
2811
2812 static type_t *get_typedef_type(symbol_t *symbol)
2813 {
2814         entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL);
2815         if (entity == NULL || entity->kind != ENTITY_TYPEDEF)
2816                 return NULL;
2817
2818         type_t *type            = allocate_type_zero(TYPE_TYPEDEF);
2819         type->typedeft.typedefe = &entity->typedefe;
2820
2821         return type;
2822 }
2823
2824 static attribute_t *parse_attribute_ms_property(attribute_t *attribute)
2825 {
2826         expect('(', end_error);
2827
2828         attribute_property_argument_t *property
2829                 = allocate_ast_zero(sizeof(*property));
2830
2831         while (true) {
2832                 if (token.type != T_IDENTIFIER) {
2833                         parse_error_expected("while parsing property declspec",
2834                                              T_IDENTIFIER, NULL);
2835                         goto end_error;
2836                 }
2837
2838                 bool is_put;
2839                 symbol_t *symbol = token.v.symbol;
2840                 next_token();
2841                 if (strcmp(symbol->string, "put") == 0) {
2842                         is_put = true;
2843                 } else if (strcmp(symbol->string, "get") == 0) {
2844                         is_put = false;
2845                 } else {
2846                         errorf(HERE, "expected put or get in property declspec");
2847                         goto end_error;
2848                 }
2849                 expect('=', end_error);
2850                 if (token.type != T_IDENTIFIER) {
2851                         parse_error_expected("while parsing property declspec",
2852                                              T_IDENTIFIER, NULL);
2853                         goto end_error;
2854                 }
2855                 if (is_put) {
2856                         property->put_symbol = token.v.symbol;
2857                 } else {
2858                         property->get_symbol = token.v.symbol;
2859                 }
2860                 next_token();
2861                 if (token.type == ')')
2862                         break;
2863                 expect(',', end_error);
2864         }
2865
2866         attribute->a.property = property;
2867
2868         expect(')', end_error);
2869
2870 end_error:
2871         return attribute;
2872 }
2873
2874 static attribute_t *parse_microsoft_extended_decl_modifier_single(void)
2875 {
2876         attribute_kind_t kind = ATTRIBUTE_UNKNOWN;
2877         if (token.type == T_restrict) {
2878                 kind = ATTRIBUTE_MS_RESTRICT;
2879                 next_token();
2880         } else if (token.type == T_IDENTIFIER) {
2881                 const char *name = token.v.symbol->string;
2882                 next_token();
2883                 for (attribute_kind_t k = ATTRIBUTE_MS_FIRST; k <= ATTRIBUTE_MS_LAST;
2884                      ++k) {
2885                         const char *attribute_name = get_attribute_name(k);
2886                         if (attribute_name != NULL && strcmp(attribute_name, name) == 0) {
2887                                 kind = k;
2888                                 break;
2889                         }
2890                 }
2891
2892                 if (kind == ATTRIBUTE_UNKNOWN && warning.attribute) {
2893                         warningf(HERE, "unknown __declspec '%s' ignored", name);
2894                 }
2895         } else {
2896                 parse_error_expected("while parsing __declspec", T_IDENTIFIER, NULL);
2897                 return NULL;
2898         }
2899
2900         attribute_t *attribute = allocate_attribute_zero(kind);
2901
2902         if (kind == ATTRIBUTE_MS_PROPERTY) {
2903                 return parse_attribute_ms_property(attribute);
2904         }
2905
2906         /* parse arguments */
2907         if (token.type == '(') {
2908                 next_token();
2909                 attribute->a.arguments = parse_attribute_arguments();
2910         }
2911
2912         return attribute;
2913 }
2914
2915 static attribute_t *parse_microsoft_extended_decl_modifier(attribute_t *first)
2916 {
2917         eat(T__declspec);
2918
2919         expect('(', end_error);
2920
2921         if (token.type == ')') {
2922                 next_token();
2923                 return NULL;
2924         }
2925
2926         add_anchor_token(')');
2927
2928         attribute_t *last = first;
2929         while (true) {
2930                 if (last != NULL) {
2931                         while (last->next != NULL)
2932                                 last = last->next;
2933                 }
2934
2935                 attribute_t *attribute
2936                         = parse_microsoft_extended_decl_modifier_single();
2937                 if (attribute == NULL)
2938                         goto end_error;
2939
2940                 if (last == NULL) {
2941                         first = attribute;
2942                 } else {
2943                         last->next = attribute;
2944                 }
2945                 last = attribute;
2946
2947                 if (token.type == ')') {
2948                         break;
2949                 }
2950                 expect(',', end_error);
2951         }
2952
2953         rem_anchor_token(')');
2954         expect(')', end_error);
2955         return first;
2956
2957 end_error:
2958         rem_anchor_token(')');
2959         return first;
2960 }
2961
2962 static entity_t *create_error_entity(symbol_t *symbol, entity_kind_tag_t kind)
2963 {
2964         entity_t *entity             = allocate_entity_zero(kind);
2965         entity->base.source_position = *HERE;
2966         entity->base.symbol          = symbol;
2967         if (is_declaration(entity)) {
2968                 entity->declaration.type     = type_error_type;
2969                 entity->declaration.implicit = true;
2970         } else if (kind == ENTITY_TYPEDEF) {
2971                 entity->typedefe.type    = type_error_type;
2972                 entity->typedefe.builtin = true;
2973         }
2974         if (kind != ENTITY_COMPOUND_MEMBER)
2975                 record_entity(entity, false);
2976         return entity;
2977 }
2978
2979 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
2980 {
2981         type_t            *type              = NULL;
2982         type_qualifiers_t  qualifiers        = TYPE_QUALIFIER_NONE;
2983         unsigned           type_specifiers   = 0;
2984         bool               newtype           = false;
2985         bool               saw_error         = false;
2986         bool               old_gcc_extension = in_gcc_extension;
2987
2988         specifiers->source_position = token.source_position;
2989
2990         while (true) {
2991                 specifiers->attributes = parse_attributes(specifiers->attributes);
2992
2993                 switch (token.type) {
2994                 /* storage class */
2995 #define MATCH_STORAGE_CLASS(token, class)                                  \
2996                 case token:                                                        \
2997                         if (specifiers->storage_class != STORAGE_CLASS_NONE) {         \
2998                                 errorf(HERE, "multiple storage classes in declaration specifiers"); \
2999                         }                                                              \
3000                         specifiers->storage_class = class;                             \
3001                         if (specifiers->thread_local)                                  \
3002                                 goto check_thread_storage_class;                           \
3003                         next_token();                                                  \
3004                         break;
3005
3006                 MATCH_STORAGE_CLASS(T_typedef,  STORAGE_CLASS_TYPEDEF)
3007                 MATCH_STORAGE_CLASS(T_extern,   STORAGE_CLASS_EXTERN)
3008                 MATCH_STORAGE_CLASS(T_static,   STORAGE_CLASS_STATIC)
3009                 MATCH_STORAGE_CLASS(T_auto,     STORAGE_CLASS_AUTO)
3010                 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3011
3012                 case T__declspec:
3013                         specifiers->attributes
3014                                 = parse_microsoft_extended_decl_modifier(specifiers->attributes);
3015                         break;
3016
3017                 case T___thread:
3018                         if (specifiers->thread_local) {
3019                                 errorf(HERE, "duplicate '__thread'");
3020                         } else {
3021                                 specifiers->thread_local = true;
3022 check_thread_storage_class:
3023                                 switch (specifiers->storage_class) {
3024                                         case STORAGE_CLASS_EXTERN:
3025                                         case STORAGE_CLASS_NONE:
3026                                         case STORAGE_CLASS_STATIC:
3027                                                 break;
3028
3029                                                 char const* wrong;
3030                                         case STORAGE_CLASS_AUTO:     wrong = "auto";     goto wrong_thread_stoarge_class;
3031                                         case STORAGE_CLASS_REGISTER: wrong = "register"; goto wrong_thread_stoarge_class;
3032                                         case STORAGE_CLASS_TYPEDEF:  wrong = "typedef";  goto wrong_thread_stoarge_class;
3033 wrong_thread_stoarge_class:
3034                                                 errorf(HERE, "'__thread' used with '%s'", wrong);
3035                                                 break;
3036                                 }
3037                         }
3038                         next_token();
3039                         break;
3040
3041                 /* type qualifiers */
3042 #define MATCH_TYPE_QUALIFIER(token, qualifier)                          \
3043                 case token:                                                     \
3044                         qualifiers |= qualifier;                                    \
3045                         next_token();                                               \
3046                         break
3047
3048                 MATCH_TYPE_QUALIFIER(T_const,    TYPE_QUALIFIER_CONST);
3049                 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3050                 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3051                 MATCH_TYPE_QUALIFIER(T__w64,     TYPE_QUALIFIER_W64);
3052                 MATCH_TYPE_QUALIFIER(T___ptr32,  TYPE_QUALIFIER_PTR32);
3053                 MATCH_TYPE_QUALIFIER(T___ptr64,  TYPE_QUALIFIER_PTR64);
3054                 MATCH_TYPE_QUALIFIER(T___uptr,   TYPE_QUALIFIER_UPTR);
3055                 MATCH_TYPE_QUALIFIER(T___sptr,   TYPE_QUALIFIER_SPTR);
3056
3057                 case T___extension__:
3058                         next_token();
3059                         in_gcc_extension = true;
3060                         break;
3061
3062                 /* type specifiers */
3063 #define MATCH_SPECIFIER(token, specifier, name)                         \
3064                 case token:                                                     \
3065                         if (type_specifiers & specifier) {                           \
3066                                 errorf(HERE, "multiple " name " type specifiers given"); \
3067                         } else {                                                    \
3068                                 type_specifiers |= specifier;                           \
3069                         }                                                           \
3070                         next_token();                                               \
3071                         break
3072
3073                 MATCH_SPECIFIER(T__Bool,      SPECIFIER_BOOL,      "_Bool");
3074                 MATCH_SPECIFIER(T__Complex,   SPECIFIER_COMPLEX,   "_Complex");
3075                 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3076                 MATCH_SPECIFIER(T__int128,    SPECIFIER_INT128,    "_int128");
3077                 MATCH_SPECIFIER(T__int16,     SPECIFIER_INT16,     "_int16");
3078                 MATCH_SPECIFIER(T__int32,     SPECIFIER_INT32,     "_int32");
3079                 MATCH_SPECIFIER(T__int64,     SPECIFIER_INT64,     "_int64");
3080                 MATCH_SPECIFIER(T__int8,      SPECIFIER_INT8,      "_int8");
3081                 MATCH_SPECIFIER(T_bool,       SPECIFIER_BOOL,      "bool");
3082                 MATCH_SPECIFIER(T_char,       SPECIFIER_CHAR,      "char");
3083                 MATCH_SPECIFIER(T_double,     SPECIFIER_DOUBLE,    "double");
3084                 MATCH_SPECIFIER(T_float,      SPECIFIER_FLOAT,     "float");
3085                 MATCH_SPECIFIER(T_int,        SPECIFIER_INT,       "int");
3086                 MATCH_SPECIFIER(T_short,      SPECIFIER_SHORT,     "short");
3087                 MATCH_SPECIFIER(T_signed,     SPECIFIER_SIGNED,    "signed");
3088                 MATCH_SPECIFIER(T_unsigned,   SPECIFIER_UNSIGNED,  "unsigned");
3089                 MATCH_SPECIFIER(T_void,       SPECIFIER_VOID,      "void");
3090                 MATCH_SPECIFIER(T_wchar_t,    SPECIFIER_WCHAR_T,   "wchar_t");
3091
3092                 case T_inline:
3093                         next_token();
3094                         specifiers->is_inline = true;
3095                         break;
3096
3097 #if 0
3098                 case T__forceinline:
3099                         next_token();
3100                         specifiers->modifiers |= DM_FORCEINLINE;
3101                         break;
3102 #endif
3103
3104                 case T_long:
3105                         if (type_specifiers & SPECIFIER_LONG_LONG) {
3106                                 errorf(HERE, "multiple type specifiers given");
3107                         } else if (type_specifiers & SPECIFIER_LONG) {
3108                                 type_specifiers |= SPECIFIER_LONG_LONG;
3109                         } else {
3110                                 type_specifiers |= SPECIFIER_LONG;
3111                         }
3112                         next_token();
3113                         break;
3114
3115 #define CHECK_DOUBLE_TYPE()        \
3116                         if ( type != NULL)     \
3117                                 errorf(HERE, "multiple data types in declaration specifiers");
3118
3119                 case T_struct:
3120                         CHECK_DOUBLE_TYPE();
3121                         type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
3122
3123                         type->compound.compound = parse_compound_type_specifier(true);
3124                         break;
3125                 case T_union:
3126                         CHECK_DOUBLE_TYPE();
3127                         type = allocate_type_zero(TYPE_COMPOUND_UNION);
3128                         type->compound.compound = parse_compound_type_specifier(false);
3129                         break;
3130                 case T_enum:
3131                         CHECK_DOUBLE_TYPE();
3132                         type = parse_enum_specifier();
3133                         break;
3134                 case T___typeof__:
3135                         CHECK_DOUBLE_TYPE();
3136                         type = parse_typeof();
3137                         break;
3138                 case T___builtin_va_list:
3139                         CHECK_DOUBLE_TYPE();
3140                         type = duplicate_type(type_valist);
3141                         next_token();
3142                         break;
3143
3144                 case T_IDENTIFIER: {
3145                         /* only parse identifier if we haven't found a type yet */
3146                         if (type != NULL || type_specifiers != 0) {
3147                                 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3148                                  * declaration, so it doesn't generate errors about expecting '(' or
3149                                  * '{' later on. */
3150                                 switch (look_ahead(1)->type) {
3151                                         STORAGE_CLASSES
3152                                         TYPE_SPECIFIERS
3153                                         case T_const:
3154                                         case T_restrict:
3155                                         case T_volatile:
3156                                         case T_inline:
3157                                         case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3158                                         case T_IDENTIFIER:
3159                                         case '&':
3160                                         case '*':
3161                                                 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3162                                                 next_token();
3163                                                 continue;
3164
3165                                         default:
3166                                                 goto finish_specifiers;
3167                                 }
3168                         }
3169
3170                         type_t *const typedef_type = get_typedef_type(token.v.symbol);
3171                         if (typedef_type == NULL) {
3172                                 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3173                                  * declaration, so it doesn't generate 'implicit int' followed by more
3174                                  * errors later on. */
3175                                 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3176                                 switch (la1_type) {
3177                                         DECLARATION_START
3178                                         case T_IDENTIFIER:
3179                                         case '&':
3180                                         case '*': {
3181                                                 errorf(HERE, "%K does not name a type", &token);
3182
3183                                                 entity_t *entity =
3184                                                         create_error_entity(token.v.symbol, ENTITY_TYPEDEF);
3185
3186                                                 type = allocate_type_zero(TYPE_TYPEDEF);
3187                                                 type->typedeft.typedefe = &entity->typedefe;
3188
3189                                                 next_token();
3190                                                 saw_error = true;
3191                                                 if (la1_type == '&' || la1_type == '*')
3192                                                         goto finish_specifiers;
3193                                                 continue;
3194                                         }
3195
3196                                         default:
3197                                                 goto finish_specifiers;
3198                                 }
3199                         }
3200
3201                         next_token();
3202                         type = typedef_type;
3203                         break;
3204                 }
3205
3206                 /* function specifier */
3207                 default:
3208                         goto finish_specifiers;
3209                 }
3210         }
3211
3212 finish_specifiers:
3213         specifiers->attributes = parse_attributes(specifiers->attributes);
3214
3215         in_gcc_extension = old_gcc_extension;
3216
3217         if (type == NULL || (saw_error && type_specifiers != 0)) {
3218                 atomic_type_kind_t atomic_type;
3219
3220                 /* match valid basic types */
3221                 switch (type_specifiers) {
3222                 case SPECIFIER_VOID:
3223                         atomic_type = ATOMIC_TYPE_VOID;
3224                         break;
3225                 case SPECIFIER_WCHAR_T:
3226                         atomic_type = ATOMIC_TYPE_WCHAR_T;
3227                         break;
3228                 case SPECIFIER_CHAR:
3229                         atomic_type = ATOMIC_TYPE_CHAR;
3230                         break;
3231                 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3232                         atomic_type = ATOMIC_TYPE_SCHAR;
3233                         break;
3234                 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3235                         atomic_type = ATOMIC_TYPE_UCHAR;
3236                         break;
3237                 case SPECIFIER_SHORT:
3238                 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3239                 case SPECIFIER_SHORT | SPECIFIER_INT:
3240                 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3241                         atomic_type = ATOMIC_TYPE_SHORT;
3242                         break;
3243                 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3244                 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3245                         atomic_type = ATOMIC_TYPE_USHORT;
3246                         break;
3247                 case SPECIFIER_INT:
3248                 case SPECIFIER_SIGNED:
3249                 case SPECIFIER_SIGNED | SPECIFIER_INT:
3250                         atomic_type = ATOMIC_TYPE_INT;
3251                         break;
3252                 case SPECIFIER_UNSIGNED:
3253                 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3254                         atomic_type = ATOMIC_TYPE_UINT;
3255                         break;
3256                 case SPECIFIER_LONG:
3257                 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3258                 case SPECIFIER_LONG | SPECIFIER_INT:
3259                 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3260                         atomic_type = ATOMIC_TYPE_LONG;
3261                         break;
3262                 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3263                 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3264                         atomic_type = ATOMIC_TYPE_ULONG;
3265                         break;
3266
3267                 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3268                 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3269                 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3270                 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3271                         | SPECIFIER_INT:
3272                         atomic_type = ATOMIC_TYPE_LONGLONG;
3273                         goto warn_about_long_long;
3274
3275                 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3276                 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3277                         | SPECIFIER_INT:
3278                         atomic_type = ATOMIC_TYPE_ULONGLONG;
3279 warn_about_long_long:
3280                         if (warning.long_long) {
3281                                 warningf(&specifiers->source_position,
3282                                          "ISO C90 does not support 'long long'");
3283                         }
3284                         break;
3285
3286                 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3287                         atomic_type = unsigned_int8_type_kind;
3288                         break;
3289
3290                 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3291                         atomic_type = unsigned_int16_type_kind;
3292                         break;
3293
3294                 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3295                         atomic_type = unsigned_int32_type_kind;
3296                         break;
3297
3298                 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3299                         atomic_type = unsigned_int64_type_kind;
3300                         break;
3301
3302                 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3303                         atomic_type = unsigned_int128_type_kind;
3304                         break;
3305
3306                 case SPECIFIER_INT8:
3307                 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3308                         atomic_type = int8_type_kind;
3309                         break;
3310
3311                 case SPECIFIER_INT16:
3312                 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3313                         atomic_type = int16_type_kind;
3314                         break;
3315
3316                 case SPECIFIER_INT32:
3317                 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3318                         atomic_type = int32_type_kind;
3319                         break;
3320
3321                 case SPECIFIER_INT64:
3322                 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3323                         atomic_type = int64_type_kind;
3324                         break;
3325
3326                 case SPECIFIER_INT128:
3327                 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3328                         atomic_type = int128_type_kind;
3329                         break;
3330
3331                 case SPECIFIER_FLOAT:
3332                         atomic_type = ATOMIC_TYPE_FLOAT;
3333                         break;
3334                 case SPECIFIER_DOUBLE:
3335                         atomic_type = ATOMIC_TYPE_DOUBLE;
3336                         break;
3337                 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3338                         atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3339                         break;
3340                 case SPECIFIER_BOOL:
3341                         atomic_type = ATOMIC_TYPE_BOOL;
3342                         break;
3343                 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3344                 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3345                         atomic_type = ATOMIC_TYPE_FLOAT;
3346                         break;
3347                 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3348                 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3349                         atomic_type = ATOMIC_TYPE_DOUBLE;
3350                         break;
3351                 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3352                 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3353                         atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3354                         break;
3355                 default:
3356                         /* invalid specifier combination, give an error message */
3357                         if (type_specifiers == 0) {
3358                                 if (saw_error)
3359                                         goto end_error;
3360
3361                                 /* ISO/IEC 14882:1998(E) §C.1.5:4 */
3362                                 if (!(c_mode & _CXX) && !strict_mode) {
3363                                         if (warning.implicit_int) {
3364                                                 warningf(HERE, "no type specifiers in declaration, using 'int'");
3365                                         }
3366                                         atomic_type = ATOMIC_TYPE_INT;
3367                                         break;
3368                                 } else {
3369                                         errorf(HERE, "no type specifiers given in declaration");
3370                                 }
3371                         } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3372                                   (type_specifiers & SPECIFIER_UNSIGNED)) {
3373                                 errorf(HERE, "signed and unsigned specifiers given");
3374                         } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3375                                 errorf(HERE, "only integer types can be signed or unsigned");
3376                         } else {
3377                                 errorf(HERE, "multiple datatypes in declaration");
3378                         }
3379                         goto end_error;
3380                 }
3381
3382                 if (type_specifiers & SPECIFIER_COMPLEX) {
3383                         type                = allocate_type_zero(TYPE_COMPLEX);
3384                         type->complex.akind = atomic_type;
3385                 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
3386                         type                  = allocate_type_zero(TYPE_IMAGINARY);
3387                         type->imaginary.akind = atomic_type;
3388                 } else {
3389                         type                 = allocate_type_zero(TYPE_ATOMIC);
3390                         type->atomic.akind   = atomic_type;
3391                 }
3392                 newtype = true;
3393         } else if (type_specifiers != 0) {
3394                 errorf(HERE, "multiple datatypes in declaration");
3395         }
3396
3397         /* FIXME: check type qualifiers here */
3398         type->base.qualifiers = qualifiers;
3399
3400         if (newtype) {
3401                 type = identify_new_type(type);
3402         } else {
3403                 type = typehash_insert(type);
3404         }
3405
3406         if (specifiers->attributes != NULL)
3407                 type = handle_type_attributes(specifiers->attributes, type);
3408         specifiers->type = type;
3409         return;
3410
3411 end_error:
3412         specifiers->type = type_error_type;
3413 }
3414
3415 static type_qualifiers_t parse_type_qualifiers(void)
3416 {
3417         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3418
3419         while (true) {
3420                 switch (token.type) {
3421                 /* type qualifiers */
3422                 MATCH_TYPE_QUALIFIER(T_const,    TYPE_QUALIFIER_CONST);
3423                 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3424                 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3425                 /* microsoft extended type modifiers */
3426                 MATCH_TYPE_QUALIFIER(T__w64,     TYPE_QUALIFIER_W64);
3427                 MATCH_TYPE_QUALIFIER(T___ptr32,  TYPE_QUALIFIER_PTR32);
3428                 MATCH_TYPE_QUALIFIER(T___ptr64,  TYPE_QUALIFIER_PTR64);
3429                 MATCH_TYPE_QUALIFIER(T___uptr,   TYPE_QUALIFIER_UPTR);
3430                 MATCH_TYPE_QUALIFIER(T___sptr,   TYPE_QUALIFIER_SPTR);
3431
3432                 default:
3433                         return qualifiers;
3434                 }
3435         }
3436 }
3437
3438 /**
3439  * Parses an K&R identifier list
3440  */
3441 static void parse_identifier_list(scope_t *scope)
3442 {
3443         do {
3444                 entity_t *entity = allocate_entity_zero(ENTITY_PARAMETER);
3445                 entity->base.source_position = token.source_position;
3446                 entity->base.namespc         = NAMESPACE_NORMAL;
3447                 entity->base.symbol          = token.v.symbol;
3448                 /* a K&R parameter has no type, yet */
3449                 next_token();
3450
3451                 if (scope != NULL)
3452                         append_entity(scope, entity);
3453
3454                 if (token.type != ',') {
3455                         break;
3456                 }
3457                 next_token();
3458         } while (token.type == T_IDENTIFIER);
3459 }
3460
3461 static entity_t *parse_parameter(void)
3462 {
3463         declaration_specifiers_t specifiers;
3464         memset(&specifiers, 0, sizeof(specifiers));
3465
3466         parse_declaration_specifiers(&specifiers);
3467
3468         entity_t *entity = parse_declarator(&specifiers,
3469                         DECL_MAY_BE_ABSTRACT | DECL_IS_PARAMETER);
3470         anonymous_entity = NULL;
3471         return entity;
3472 }
3473
3474 static void semantic_parameter_incomplete(const entity_t *entity)
3475 {
3476         assert(entity->kind == ENTITY_PARAMETER);
3477
3478         /* §6.7.5.3:4  After adjustment, the parameters in a parameter type
3479          *             list in a function declarator that is part of a
3480          *             definition of that function shall not have
3481          *             incomplete type. */
3482         type_t *type = skip_typeref(entity->declaration.type);
3483         if (is_type_incomplete(type)) {
3484                 errorf(&entity->base.source_position,
3485                                 "parameter '%#T' has incomplete type",
3486                                 entity->declaration.type, entity->base.symbol);
3487         }
3488 }
3489
3490 static bool has_parameters(void)
3491 {
3492         /* func(void) is not a parameter */
3493         if (token.type == T_IDENTIFIER) {
3494                 entity_t const *const entity = get_entity(token.v.symbol, NAMESPACE_NORMAL);
3495                 if (entity == NULL)
3496                         return true;
3497                 if (entity->kind != ENTITY_TYPEDEF)
3498                         return true;
3499                 if (skip_typeref(entity->typedefe.type) != type_void)
3500                         return true;
3501         } else if (token.type != T_void) {
3502                 return true;
3503         }
3504         if (look_ahead(1)->type != ')')
3505                 return true;
3506         next_token();
3507         return false;
3508 }
3509
3510 /**
3511  * Parses function type parameters (and optionally creates variable_t entities
3512  * for them in a scope)
3513  */
3514 static void parse_parameters(function_type_t *type, scope_t *scope)
3515 {
3516         eat('(');
3517         add_anchor_token(')');
3518         int saved_comma_state = save_and_reset_anchor_state(',');
3519
3520         if (token.type == T_IDENTIFIER &&
3521             !is_typedef_symbol(token.v.symbol)) {
3522                 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
3523                 if (la1_type == ',' || la1_type == ')') {
3524                         type->kr_style_parameters = true;
3525                         parse_identifier_list(scope);
3526                         goto parameters_finished;
3527                 }
3528         }
3529
3530         if (token.type == ')') {
3531                 /* ISO/IEC 14882:1998(E) §C.1.6:1 */
3532                 if (!(c_mode & _CXX))
3533                         type->unspecified_parameters = true;
3534                 goto parameters_finished;
3535         }
3536
3537         if (has_parameters()) {
3538                 function_parameter_t **anchor = &type->parameters;
3539                 for (;;) {
3540                         switch (token.type) {
3541                         case T_DOTDOTDOT:
3542                                 next_token();
3543                                 type->variadic = true;
3544                                 goto parameters_finished;
3545
3546                         case T_IDENTIFIER:
3547                         case T___extension__:
3548                         DECLARATION_START
3549                         {
3550                                 entity_t *entity = parse_parameter();
3551                                 if (entity->kind == ENTITY_TYPEDEF) {
3552                                         errorf(&entity->base.source_position,
3553                                                         "typedef not allowed as function parameter");
3554                                         break;
3555                                 }
3556                                 assert(is_declaration(entity));
3557
3558                                 semantic_parameter_incomplete(entity);
3559
3560                                 function_parameter_t *const parameter =
3561                                         allocate_parameter(entity->declaration.type);
3562
3563                                 if (scope != NULL) {
3564                                         append_entity(scope, entity);
3565                                 }
3566
3567                                 *anchor = parameter;
3568                                 anchor  = &parameter->next;
3569                                 break;
3570                         }
3571
3572                         default:
3573                                 goto parameters_finished;
3574                         }
3575                         if (token.type != ',') {
3576                                 goto parameters_finished;
3577                         }
3578                         next_token();
3579                 }
3580         }
3581
3582
3583 parameters_finished:
3584         rem_anchor_token(')');
3585         expect(')', end_error);
3586
3587 end_error:
3588         restore_anchor_state(',', saved_comma_state);
3589 }
3590
3591 typedef enum construct_type_kind_t {
3592         CONSTRUCT_INVALID,
3593         CONSTRUCT_POINTER,
3594         CONSTRUCT_REFERENCE,
3595         CONSTRUCT_FUNCTION,
3596         CONSTRUCT_ARRAY
3597 } construct_type_kind_t;
3598
3599 typedef union construct_type_t construct_type_t;
3600
3601 typedef struct construct_type_base_t {
3602         construct_type_kind_t  kind;
3603         construct_type_t      *next;
3604 } construct_type_base_t;
3605
3606 typedef struct parsed_pointer_t {
3607         construct_type_base_t  base;
3608         type_qualifiers_t      type_qualifiers;
3609         variable_t            *base_variable;  /**< MS __based extension. */
3610 } parsed_pointer_t;
3611
3612 typedef struct parsed_reference_t {
3613         construct_type_base_t base;
3614 } parsed_reference_t;
3615
3616 typedef struct construct_function_type_t {
3617         construct_type_base_t  base;
3618         type_t                *function_type;
3619 } construct_function_type_t;
3620
3621 typedef struct parsed_array_t {
3622         construct_type_base_t  base;
3623         type_qualifiers_t      type_qualifiers;
3624         bool                   is_static;
3625         bool                   is_variable;
3626         expression_t          *size;
3627 } parsed_array_t;
3628
3629 union construct_type_t {
3630         construct_type_kind_t     kind;
3631         construct_type_base_t     base;
3632         parsed_pointer_t          pointer;
3633         parsed_reference_t        reference;
3634         construct_function_type_t function;
3635         parsed_array_t            array;
3636 };
3637
3638 static construct_type_t *parse_pointer_declarator(void)
3639 {
3640         eat('*');
3641
3642         parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3643         memset(pointer, 0, sizeof(pointer[0]));
3644         pointer->base.kind       = CONSTRUCT_POINTER;
3645         pointer->type_qualifiers = parse_type_qualifiers();
3646         //pointer->base_variable       = base_variable;
3647
3648         return (construct_type_t*) pointer;
3649 }
3650
3651 static construct_type_t *parse_reference_declarator(void)
3652 {
3653         eat('&');
3654
3655         construct_type_t   *cons      = obstack_alloc(&temp_obst, sizeof(cons->reference));
3656         parsed_reference_t *reference = &cons->reference;
3657         memset(reference, 0, sizeof(*reference));
3658         cons->kind = CONSTRUCT_REFERENCE;
3659
3660         return cons;
3661 }
3662
3663 static construct_type_t *parse_array_declarator(void)
3664 {
3665         eat('[');
3666         add_anchor_token(']');
3667
3668         construct_type_t *cons  = obstack_alloc(&temp_obst, sizeof(cons->array));
3669         parsed_array_t   *array = &cons->array;
3670         memset(array, 0, sizeof(*array));
3671         cons->kind = CONSTRUCT_ARRAY;
3672
3673         if (token.type == T_static) {
3674                 array->is_static = true;
3675                 next_token();
3676         }
3677
3678         type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3679         if (type_qualifiers != 0) {
3680                 if (token.type == T_static) {
3681                         array->is_static = true;
3682                         next_token();
3683                 }
3684         }
3685         array->type_qualifiers = type_qualifiers;
3686
3687         if (token.type == '*' && look_ahead(1)->type == ']') {
3688                 array->is_variable = true;
3689                 next_token();
3690         } else if (token.type != ']') {
3691                 expression_t *const size = parse_assignment_expression();
3692
3693                 /* §6.7.5.2:1  Array size must have integer type */
3694                 type_t *const orig_type = size->base.type;
3695                 type_t *const type      = skip_typeref(orig_type);
3696                 if (!is_type_integer(type) && is_type_valid(type)) {
3697                         errorf(&size->base.source_position,
3698                                "array size '%E' must have integer type but has type '%T'",
3699                                size, orig_type);
3700                 }
3701
3702                 array->size = size;
3703                 mark_vars_read(size, NULL);
3704         }
3705
3706         rem_anchor_token(']');
3707         expect(']', end_error);
3708
3709 end_error:
3710         return cons;
3711 }
3712
3713 static construct_type_t *parse_function_declarator(scope_t *scope)
3714 {
3715         type_t          *type  = allocate_type_zero(TYPE_FUNCTION);
3716         function_type_t *ftype = &type->function;
3717
3718         ftype->linkage            = current_linkage;
3719         ftype->calling_convention = CC_DEFAULT;
3720
3721         parse_parameters(ftype, scope);
3722
3723         construct_type_t          *cons     = obstack_alloc(&temp_obst, sizeof(cons->function));
3724         construct_function_type_t *function = &cons->function;
3725         memset(function, 0, sizeof(*function));
3726         cons->kind              = CONSTRUCT_FUNCTION;
3727         function->function_type = type;
3728
3729         return cons;
3730 }
3731
3732 typedef struct parse_declarator_env_t {
3733         bool               may_be_abstract : 1;
3734         bool               must_be_abstract : 1;
3735         decl_modifiers_t   modifiers;
3736         symbol_t          *symbol;
3737         source_position_t  source_position;
3738         scope_t            parameters;
3739         attribute_t       *attributes;
3740 } parse_declarator_env_t;
3741
3742 static construct_type_t *parse_inner_declarator(parse_declarator_env_t *env)
3743 {
3744         /* construct a single linked list of construct_type_t's which describe
3745          * how to construct the final declarator type */
3746         construct_type_t  *first      = NULL;
3747         construct_type_t **anchor     = &first;
3748
3749         env->attributes = parse_attributes(env->attributes);
3750
3751         for (;;) {
3752                 construct_type_t *type;
3753                 //variable_t       *based = NULL; /* MS __based extension */
3754                 switch (token.type) {
3755                         case '&':
3756                                 if (!(c_mode & _CXX))
3757                                         errorf(HERE, "references are only available for C++");
3758                                 type = parse_reference_declarator();
3759                                 break;
3760
3761                         case T__based: {
3762 #if 0
3763                                 source_position_t const pos = *HERE;
3764                                 next_token();
3765                                 expect('(', end_error);
3766                                 add_anchor_token(')');
3767                                 based = parse_microsoft_based();
3768                                 rem_anchor_token(')');
3769                                 expect(')', end_error);
3770                                 if (token.type != '*') {
3771                                         if (token.type == T__based) {
3772                                                 errorf(&pos, "__based type modifier specified more than once");
3773                                         } else if (warning.other) {
3774                                                 warningf(&pos,
3775                                                                 "__based does not precede a pointer declarator, ignored");
3776                                         }
3777                                         continue;
3778                                 }
3779 #else
3780                                 panic("based currently disabled");
3781 #endif
3782                                 /* FALLTHROUGH */
3783                         }
3784
3785                         case '*':
3786                                 type = parse_pointer_declarator();
3787                                 break;
3788
3789                         default:
3790                                 goto ptr_operator_end;
3791                 }
3792
3793                 *anchor = type;
3794                 anchor  = &type->base.next;
3795
3796                 /* TODO: find out if this is correct */
3797                 env->attributes = parse_attributes(env->attributes);
3798         }
3799
3800 ptr_operator_end: ;
3801 #if 0
3802         modifiers      |= env->modifiers;
3803         env->modifiers  = modifiers;
3804 #endif
3805
3806         construct_type_t *inner_types = NULL;
3807
3808         switch (token.type) {
3809         case T_IDENTIFIER:
3810                 if (env->must_be_abstract) {
3811                         errorf(HERE, "no identifier expected in typename");
3812                 } else {
3813                         env->symbol          = token.v.symbol;
3814                         env->source_position = token.source_position;
3815                 }
3816                 next_token();
3817                 break;
3818         case '(':
3819                 /* §6.7.6:2 footnote 126:  Empty parentheses in a type name are
3820                  * interpreted as ``function with no parameter specification'', rather
3821                  * than redundant parentheses around the omitted identifier. */
3822                 if (look_ahead(1)->type != ')') {
3823                         next_token();
3824                         add_anchor_token(')');
3825                         inner_types = parse_inner_declarator(env);
3826                         if (inner_types != NULL) {
3827                                 /* All later declarators only modify the return type */
3828                                 env->must_be_abstract = true;
3829                         }
3830                         rem_anchor_token(')');
3831                         expect(')', end_error);
3832                 }
3833                 break;
3834         default:
3835                 if (env->may_be_abstract)
3836                         break;
3837                 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
3838                 eat_until_anchor();
3839                 return NULL;
3840         }
3841
3842         construct_type_t **const p = anchor;
3843
3844         for (;;) {
3845                 construct_type_t *type;
3846                 switch (token.type) {
3847                 case '(': {
3848                         scope_t *scope = NULL;
3849                         if (!env->must_be_abstract) {
3850                                 scope = &env->parameters;
3851                         }
3852
3853                         type = parse_function_declarator(scope);
3854                         break;
3855                 }
3856                 case '[':
3857                         type = parse_array_declarator();
3858                         break;
3859                 default:
3860                         goto declarator_finished;
3861                 }
3862
3863                 /* insert in the middle of the list (at p) */
3864                 type->base.next = *p;
3865                 *p              = type;
3866                 if (anchor == p)
3867                         anchor = &type->base.next;
3868         }
3869
3870 declarator_finished:
3871         /* append inner_types at the end of the list, we don't to set anchor anymore
3872          * as it's not needed anymore */
3873         *anchor = inner_types;
3874
3875         return first;
3876 end_error:
3877         return NULL;
3878 }
3879
3880 static type_t *construct_declarator_type(construct_type_t *construct_list, type_t *type)
3881 {
3882         construct_type_t *iter = construct_list;
3883         for (; iter != NULL; iter = iter->base.next) {
3884                 switch (iter->kind) {
3885                 case CONSTRUCT_INVALID:
3886                         break;
3887                 case CONSTRUCT_FUNCTION: {
3888                         construct_function_type_t *function      = &iter->function;
3889                         type_t                    *function_type = function->function_type;
3890
3891                         function_type->function.return_type = type;
3892
3893                         type_t *skipped_return_type = skip_typeref(type);
3894                         /* §6.7.5.3:1 */
3895                         if (is_type_function(skipped_return_type)) {
3896                                 errorf(HERE, "function returning function is not allowed");
3897                         } else if (is_type_array(skipped_return_type)) {
3898                                 errorf(HERE, "function returning array is not allowed");
3899                         } else {
3900                                 if (skipped_return_type->base.qualifiers != 0 && warning.other) {
3901                                         warningf(HERE,
3902                                                 "type qualifiers in return type of function type are meaningless");
3903                                 }
3904                         }
3905
3906                         /* The function type was constructed earlier.  Freeing it here will
3907                          * destroy other types. */
3908                         type = typehash_insert(function_type);
3909                         continue;
3910                 }
3911
3912                 case CONSTRUCT_POINTER: {
3913                         if (is_type_reference(skip_typeref(type)))
3914                                 errorf(HERE, "cannot declare a pointer to reference");
3915
3916                         parsed_pointer_t *pointer = &iter->pointer;
3917                         type = make_based_pointer_type(type, pointer->type_qualifiers, pointer->base_variable);
3918                         continue;
3919                 }
3920
3921                 case CONSTRUCT_REFERENCE:
3922                         if (is_type_reference(skip_typeref(type)))
3923                                 errorf(HERE, "cannot declare a reference to reference");
3924
3925                         type = make_reference_type(type);
3926                         continue;
3927
3928                 case CONSTRUCT_ARRAY: {
3929                         if (is_type_reference(skip_typeref(type)))
3930                                 errorf(HERE, "cannot declare an array of references");
3931
3932                         parsed_array_t *array      = &iter->array;
3933                         type_t         *array_type = allocate_type_zero(TYPE_ARRAY);
3934
3935                         expression_t *size_expression = array->size;
3936                         if (size_expression != NULL) {
3937                                 size_expression
3938                                         = create_implicit_cast(size_expression, type_size_t);
3939                         }
3940
3941                         array_type->base.qualifiers       = array->type_qualifiers;
3942                         array_type->array.element_type    = type;
3943                         array_type->array.is_static       = array->is_static;
3944                         array_type->array.is_variable     = array->is_variable;
3945                         array_type->array.size_expression = size_expression;
3946
3947                         if (size_expression != NULL) {
3948                                 if (is_constant_expression(size_expression)) {
3949                                         long const size
3950                                                 = fold_constant_to_int(size_expression);
3951                                         array_type->array.size          = size;
3952                                         array_type->array.size_constant = true;
3953                                         /* §6.7.5.2:1  If the expression is a constant expression, it shall
3954                                          * have a value greater than zero. */
3955                                         if (size <= 0) {
3956                                                 if (size < 0 || !GNU_MODE) {
3957                                                         errorf(&size_expression->base.source_position,
3958                                                                         "size of array must be greater than zero");
3959                                                 } else if (warning.other) {
3960                                                         warningf(&size_expression->base.source_position,
3961                                                                         "zero length arrays are a GCC extension");
3962                                                 }
3963                                         }
3964                                 } else {
3965                                         array_type->array.is_vla = true;
3966                                 }
3967                         }
3968
3969                         type_t *skipped_type = skip_typeref(type);
3970                         /* §6.7.5.2:1 */
3971                         if (is_type_incomplete(skipped_type)) {
3972                                 errorf(HERE, "array of incomplete type '%T' is not allowed", type);
3973                         } else if (is_type_function(skipped_type)) {
3974                                 errorf(HERE, "array of functions is not allowed");
3975                         }
3976                         type = identify_new_type(array_type);
3977                         continue;
3978                 }
3979                 }
3980                 internal_errorf(HERE, "invalid type construction found");
3981         }
3982
3983         return type;
3984 }
3985
3986 static type_t *automatic_type_conversion(type_t *orig_type);
3987
3988 static type_t *semantic_parameter(const source_position_t *pos,
3989                                   type_t *type,
3990                                   const declaration_specifiers_t *specifiers,
3991                                   symbol_t *symbol)
3992 {
3993         /* §6.7.5.3:7  A declaration of a parameter as ``array of type''
3994          *             shall be adjusted to ``qualified pointer to type'',
3995          *             [...]
3996          * §6.7.5.3:8  A declaration of a parameter as ``function returning
3997          *             type'' shall be adjusted to ``pointer to function
3998          *             returning type'', as in 6.3.2.1. */
3999         type = automatic_type_conversion(type);
4000
4001         if (specifiers->is_inline && is_type_valid(type)) {
4002                 errorf(pos, "parameter '%#T' declared 'inline'", type, symbol);
4003         }
4004
4005         /* §6.9.1:6  The declarations in the declaration list shall contain
4006          *           no storage-class specifier other than register and no
4007          *           initializations. */
4008         if (specifiers->thread_local || (
4009                         specifiers->storage_class != STORAGE_CLASS_NONE   &&
4010                         specifiers->storage_class != STORAGE_CLASS_REGISTER)
4011            ) {
4012                 errorf(pos, "invalid storage class for parameter '%#T'", type, symbol);
4013         }
4014
4015         /* delay test for incomplete type, because we might have (void)
4016          * which is legal but incomplete... */
4017
4018         return type;
4019 }
4020
4021 static entity_t *parse_declarator(const declaration_specifiers_t *specifiers,
4022                                   declarator_flags_t flags)
4023 {
4024         parse_declarator_env_t env;
4025         memset(&env, 0, sizeof(env));
4026         env.may_be_abstract = (flags & DECL_MAY_BE_ABSTRACT) != 0;
4027
4028         construct_type_t *construct_type = parse_inner_declarator(&env);
4029         type_t           *orig_type      =
4030                 construct_declarator_type(construct_type, specifiers->type);
4031         type_t           *type           = skip_typeref(orig_type);
4032
4033         if (construct_type != NULL) {
4034                 obstack_free(&temp_obst, construct_type);
4035         }
4036
4037         attribute_t *attributes = parse_attributes(env.attributes);
4038         /* append (shared) specifier attribute behind attributes of this
4039            declarator */
4040         if (attributes != NULL) {
4041                 attribute_t *last = attributes;
4042                 while (last->next != NULL)
4043                         last = last->next;
4044                 last->next = specifiers->attributes;
4045         } else {
4046                 attributes = specifiers->attributes;
4047         }
4048
4049         entity_t *entity;
4050         if (specifiers->storage_class == STORAGE_CLASS_TYPEDEF) {
4051                 entity                       = allocate_entity_zero(ENTITY_TYPEDEF);
4052                 entity->base.symbol          = env.symbol;
4053                 entity->base.source_position = env.source_position;
4054                 entity->typedefe.type        = orig_type;
4055
4056                 if (anonymous_entity != NULL) {
4057                         if (is_type_compound(type)) {
4058                                 assert(anonymous_entity->compound.alias == NULL);
4059                                 assert(anonymous_entity->kind == ENTITY_STRUCT ||
4060                                        anonymous_entity->kind == ENTITY_UNION);
4061                                 anonymous_entity->compound.alias = entity;
4062                                 anonymous_entity = NULL;
4063                         } else if (is_type_enum(type)) {
4064                                 assert(anonymous_entity->enume.alias == NULL);
4065                                 assert(anonymous_entity->kind == ENTITY_ENUM);
4066                                 anonymous_entity->enume.alias = entity;
4067                                 anonymous_entity = NULL;
4068                         }
4069                 }
4070         } else {
4071                 /* create a declaration type entity */
4072                 if (flags & DECL_CREATE_COMPOUND_MEMBER) {
4073                         entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
4074
4075                         if (env.symbol != NULL) {
4076                                 if (specifiers->is_inline && is_type_valid(type)) {
4077                                         errorf(&env.source_position,
4078                                                         "compound member '%Y' declared 'inline'", env.symbol);
4079                                 }
4080
4081                                 if (specifiers->thread_local ||
4082                                                 specifiers->storage_class != STORAGE_CLASS_NONE) {
4083                                         errorf(&env.source_position,
4084                                                         "compound member '%Y' must have no storage class",
4085                                                         env.symbol);
4086                                 }
4087                         }
4088                 } else if (flags & DECL_IS_PARAMETER) {
4089                         orig_type = semantic_parameter(&env.source_position, orig_type,
4090                                                        specifiers, env.symbol);
4091
4092                         entity = allocate_entity_zero(ENTITY_PARAMETER);
4093                 } else if (is_type_function(type)) {
4094                         entity = allocate_entity_zero(ENTITY_FUNCTION);
4095
4096                         entity->function.is_inline  = specifiers->is_inline;
4097                         entity->function.parameters = env.parameters;
4098
4099                         if (env.symbol != NULL) {
4100                                 /* this needs fixes for C++ */
4101                                 bool in_function_scope = current_function != NULL;
4102
4103                                 if (specifiers->thread_local || (
4104                                       specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4105                                           specifiers->storage_class != STORAGE_CLASS_NONE   &&
4106                                           (in_function_scope || specifiers->storage_class != STORAGE_CLASS_STATIC)
4107                                    )) {
4108                                         errorf(&env.source_position,
4109                                                         "invalid storage class for function '%Y'", env.symbol);
4110                                 }
4111                         }
4112                 } else {
4113                         entity = allocate_entity_zero(ENTITY_VARIABLE);
4114
4115                         entity->variable.thread_local = specifiers->thread_local;
4116
4117                         if (env.symbol != NULL) {
4118                                 if (specifiers->is_inline && is_type_valid(type)) {
4119                                         errorf(&env.source_position,
4120                                                         "variable '%Y' declared 'inline'", env.symbol);
4121                                 }
4122
4123                                 bool invalid_storage_class = false;
4124                                 if (current_scope == file_scope) {
4125                                         if (specifiers->storage_class != STORAGE_CLASS_EXTERN &&
4126                                                         specifiers->storage_class != STORAGE_CLASS_NONE   &&
4127                                                         specifiers->storage_class != STORAGE_CLASS_STATIC) {
4128                                                 invalid_storage_class = true;
4129                                         }
4130                                 } else {
4131                                         if (specifiers->thread_local &&
4132                                                         specifiers->storage_class == STORAGE_CLASS_NONE) {
4133                                                 invalid_storage_class = true;
4134                                         }
4135                                 }
4136                                 if (invalid_storage_class) {
4137                                         errorf(&env.source_position,
4138                                                         "invalid storage class for variable '%Y'", env.symbol);
4139                                 }
4140                         }
4141                 }
4142
4143                 if (env.symbol != NULL) {
4144                         entity->base.symbol          = env.symbol;
4145                         entity->base.source_position = env.source_position;
4146                 } else {
4147                         entity->base.source_position = specifiers->source_position;
4148                 }
4149                 entity->base.namespc           = NAMESPACE_NORMAL;
4150                 entity->declaration.type       = orig_type;
4151                 entity->declaration.alignment  = get_type_alignment(orig_type);
4152                 entity->declaration.modifiers  = env.modifiers;
4153                 entity->declaration.attributes = attributes;
4154
4155                 storage_class_t storage_class = specifiers->storage_class;
4156                 entity->declaration.declared_storage_class = storage_class;
4157
4158                 if (storage_class == STORAGE_CLASS_NONE && current_function != NULL)
4159                         storage_class = STORAGE_CLASS_AUTO;
4160                 entity->declaration.storage_class = storage_class;
4161         }
4162
4163         if (attributes != NULL) {
4164                 handle_entity_attributes(attributes, entity);
4165         }
4166
4167         return entity;
4168 }
4169
4170 static type_t *parse_abstract_declarator(type_t *base_type)
4171 {
4172         parse_declarator_env_t env;
4173         memset(&env, 0, sizeof(env));
4174         env.may_be_abstract = true;
4175         env.must_be_abstract = true;
4176
4177         construct_type_t *construct_type = parse_inner_declarator(&env);
4178
4179         type_t *result = construct_declarator_type(construct_type, base_type);
4180         if (construct_type != NULL) {
4181                 obstack_free(&temp_obst, construct_type);
4182         }
4183         result = handle_type_attributes(env.attributes, result);
4184
4185         return result;
4186 }
4187
4188 /**
4189  * Check if the declaration of main is suspicious.  main should be a
4190  * function with external linkage, returning int, taking either zero
4191  * arguments, two, or three arguments of appropriate types, ie.
4192  *
4193  * int main([ int argc, char **argv [, char **env ] ]).
4194  *
4195  * @param decl    the declaration to check
4196  * @param type    the function type of the declaration
4197  */
4198 static void check_main(const entity_t *entity)
4199 {
4200         const source_position_t *pos = &entity->base.source_position;
4201         if (entity->kind != ENTITY_FUNCTION) {
4202                 warningf(pos, "'main' is not a function");
4203                 return;
4204         }
4205
4206         if (entity->declaration.storage_class == STORAGE_CLASS_STATIC) {
4207                 warningf(pos, "'main' is normally a non-static function");
4208         }
4209
4210         type_t *type = skip_typeref(entity->declaration.type);
4211         assert(is_type_function(type));
4212
4213         function_type_t *func_type = &type->function;
4214         if (!types_compatible(skip_typeref(func_type->return_type), type_int)) {
4215                 warningf(pos, "return type of 'main' should be 'int', but is '%T'",
4216                          func_type->return_type);
4217         }
4218         const function_parameter_t *parm = func_type->parameters;
4219         if (parm != NULL) {
4220                 type_t *const first_type = parm->type;
4221                 if (!types_compatible(skip_typeref(first_type), type_int)) {
4222                         warningf(pos,
4223                                  "first argument of 'main' should be 'int', but is '%T'",
4224                                  first_type);
4225                 }
4226                 parm = parm->next;
4227                 if (parm != NULL) {
4228                         type_t *const second_type = parm->type;
4229                         if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4230                                 warningf(pos, "second argument of 'main' should be 'char**', but is '%T'", second_type);
4231                         }
4232                         parm = parm->next;
4233                         if (parm != NULL) {
4234                                 type_t *const third_type = parm->type;
4235                                 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4236                                         warningf(pos, "third argument of 'main' should be 'char**', but is '%T'", third_type);
4237                                 }
4238                                 parm = parm->next;
4239                                 if (parm != NULL)
4240                                         goto warn_arg_count;
4241                         }
4242                 } else {
4243 warn_arg_count:
4244                         warningf(pos, "'main' takes only zero, two or three arguments");
4245                 }
4246         }
4247 }
4248
4249 /**
4250  * Check if a symbol is the equal to "main".
4251  */
4252 static bool is_sym_main(const symbol_t *const sym)
4253 {
4254         return strcmp(sym->string, "main") == 0;
4255 }
4256
4257 static void error_redefined_as_different_kind(const source_position_t *pos,
4258                 const entity_t *old, entity_kind_t new_kind)
4259 {
4260         errorf(pos, "redeclaration of %s '%Y' as %s (declared %P)",
4261                get_entity_kind_name(old->kind), old->base.symbol,
4262                get_entity_kind_name(new_kind), &old->base.source_position);
4263 }
4264
4265 static bool is_error_entity(entity_t *const ent)
4266 {
4267         if (is_declaration(ent)) {
4268                 return is_type_valid(skip_typeref(ent->declaration.type));
4269         } else if (ent->kind == ENTITY_TYPEDEF) {
4270                 return is_type_valid(skip_typeref(ent->typedefe.type));
4271         }
4272         return false;
4273 }
4274
4275 static bool contains_attribute(const attribute_t *list, const attribute_t *attr)
4276 {
4277         for (const attribute_t *tattr = list; tattr != NULL; tattr = tattr->next) {
4278                 if (attributes_equal(tattr, attr))
4279                         return true;
4280         }
4281         return false;
4282 }
4283
4284 /**
4285  * test wether new_list contains any attributes not included in old_list
4286  */
4287 static bool has_new_attributes(const attribute_t *old_list,
4288                                const attribute_t *new_list)
4289 {
4290         for (const attribute_t *attr = new_list; attr != NULL; attr = attr->next) {
4291                 if (!contains_attribute(old_list, attr))
4292                         return true;
4293         }
4294         return false;
4295 }
4296
4297 /**
4298  * Merge in attributes from an attribute list (probably from a previous
4299  * declaration with the same name). Warning: destroys the old structure
4300  * of the attribute list - don't reuse attributes after this call.
4301  */
4302 static void merge_in_attributes(declaration_t *decl, attribute_t *attributes)
4303 {
4304         attribute_t *next;
4305         for (attribute_t *attr = attributes; attr != NULL; attr = next) {
4306                 next = attr->next;
4307                 if (contains_attribute(decl->attributes, attr))
4308                         continue;
4309
4310                 /* move attribute to new declarations attributes list */
4311                 attr->next       = decl->attributes;
4312                 decl->attributes = attr;
4313         }
4314 }
4315
4316 /**
4317  * record entities for the NAMESPACE_NORMAL, and produce error messages/warnings
4318  * for various problems that occur for multiple definitions
4319  */
4320 static entity_t *record_entity(entity_t *entity, const bool is_definition)
4321 {
4322         const symbol_t *const    symbol  = entity->base.symbol;
4323         const namespace_tag_t    namespc = (namespace_tag_t)entity->base.namespc;
4324         const source_position_t *pos     = &entity->base.source_position;
4325
4326         /* can happen in error cases */
4327         if (symbol == NULL)
4328                 return entity;
4329
4330         entity_t *const previous_entity = get_entity(symbol, namespc);
4331         /* pushing the same entity twice will break the stack structure */
4332         assert(previous_entity != entity);
4333
4334         if (entity->kind == ENTITY_FUNCTION) {
4335                 type_t *const orig_type = entity->declaration.type;
4336                 type_t *const type      = skip_typeref(orig_type);
4337
4338                 assert(is_type_function(type));
4339                 if (type->function.unspecified_parameters &&
4340                                 warning.strict_prototypes &&
4341                                 previous_entity == NULL) {
4342                         warningf(pos, "function declaration '%#T' is not a prototype",
4343                                          orig_type, symbol);
4344                 }
4345
4346                 if (warning.main && current_scope == file_scope
4347                                 && is_sym_main(symbol)) {
4348                         check_main(entity);
4349                 }
4350         }
4351
4352         if (is_declaration(entity) &&
4353                         warning.nested_externs &&
4354                         entity->declaration.storage_class == STORAGE_CLASS_EXTERN &&
4355                         current_scope != file_scope) {
4356                 warningf(pos, "nested extern declaration of '%#T'",
4357                          entity->declaration.type, symbol);
4358         }
4359
4360         if (previous_entity != NULL) {
4361                 if (previous_entity->base.parent_scope == &current_function->parameters &&
4362                                 previous_entity->base.parent_scope->depth + 1 == current_scope->depth) {
4363                         assert(previous_entity->kind == ENTITY_PARAMETER);
4364                         errorf(pos,
4365                                         "declaration '%#T' redeclares the parameter '%#T' (declared %P)",
4366                                         entity->declaration.type, symbol,
4367                                         previous_entity->declaration.type, symbol,
4368                                         &previous_entity->base.source_position);
4369                         goto finish;
4370                 }
4371
4372                 if (previous_entity->base.parent_scope == current_scope) {
4373                         if (previous_entity->kind != entity->kind) {
4374                                 if (!is_error_entity(previous_entity) && !is_error_entity(entity)) {
4375                                         error_redefined_as_different_kind(pos, previous_entity,
4376                                                         entity->kind);
4377                                 }
4378                                 goto finish;
4379                         }
4380                         if (previous_entity->kind == ENTITY_ENUM_VALUE) {
4381                                 errorf(pos, "redeclaration of enum entry '%Y' (declared %P)",
4382                                                 symbol, &previous_entity->base.source_position);
4383                                 goto finish;
4384                         }
4385                         if (previous_entity->kind == ENTITY_TYPEDEF) {
4386                                 /* TODO: C++ allows this for exactly the same type */
4387                                 errorf(pos, "redefinition of typedef '%Y' (declared %P)",
4388                                                 symbol, &previous_entity->base.source_position);
4389                                 goto finish;
4390                         }
4391
4392                         /* at this point we should have only VARIABLES or FUNCTIONS */
4393                         assert(is_declaration(previous_entity) && is_declaration(entity));
4394
4395                         declaration_t *const prev_decl = &previous_entity->declaration;
4396                         declaration_t *const decl      = &entity->declaration;
4397
4398                         /* can happen for K&R style declarations */
4399                         if (prev_decl->type       == NULL             &&
4400                                         previous_entity->kind == ENTITY_PARAMETER &&
4401                                         entity->kind          == ENTITY_PARAMETER) {
4402                                 prev_decl->type                   = decl->type;
4403                                 prev_decl->storage_class          = decl->storage_class;
4404                                 prev_decl->declared_storage_class = decl->declared_storage_class;
4405                                 prev_decl->modifiers              = decl->modifiers;
4406                                 return previous_entity;
4407                         }
4408
4409                         type_t *const orig_type = decl->type;
4410                         assert(orig_type != NULL);
4411                         type_t *const type      = skip_typeref(orig_type);
4412                         type_t *const prev_type = skip_typeref(prev_decl->type);
4413
4414                         if (!types_compatible(type, prev_type)) {
4415                                 errorf(pos,
4416                                                 "declaration '%#T' is incompatible with '%#T' (declared %P)",
4417                                                 orig_type, symbol, prev_decl->type, symbol,
4418                                                 &previous_entity->base.source_position);
4419                         } else {
4420                                 unsigned old_storage_class = prev_decl->storage_class;
4421
4422                                 if (warning.redundant_decls               &&
4423                                                 is_definition                     &&
4424                                                 !prev_decl->used                  &&
4425                                                 !(prev_decl->modifiers & DM_USED) &&
4426                                                 prev_decl->storage_class == STORAGE_CLASS_STATIC) {
4427                                         warningf(&previous_entity->base.source_position,
4428                                                         "unnecessary static forward declaration for '%#T'",
4429                                                         prev_decl->type, symbol);
4430                                 }
4431
4432                                 storage_class_t new_storage_class = decl->storage_class;
4433
4434                                 /* pretend no storage class means extern for function
4435                                  * declarations (except if the previous declaration is neither
4436                                  * none nor extern) */
4437                                 if (entity->kind == ENTITY_FUNCTION) {
4438                                         /* the previous declaration could have unspecified parameters or
4439                                          * be a typedef, so use the new type */
4440                                         if (prev_type->function.unspecified_parameters || is_definition)
4441                                                 prev_decl->type = type;
4442
4443                                         switch (old_storage_class) {
4444                                                 case STORAGE_CLASS_NONE:
4445                                                         old_storage_class = STORAGE_CLASS_EXTERN;
4446                                                         /* FALLTHROUGH */
4447
4448                                                 case STORAGE_CLASS_EXTERN:
4449                                                         if (is_definition) {
4450                                                                 if (warning.missing_prototypes &&
4451                                                                                 prev_type->function.unspecified_parameters &&
4452                                                                                 !is_sym_main(symbol)) {
4453                                                                         warningf(pos, "no previous prototype for '%#T'",
4454                                                                                         orig_type, symbol);
4455                                                                 }
4456                                                         } else if (new_storage_class == STORAGE_CLASS_NONE) {
4457                                                                 new_storage_class = STORAGE_CLASS_EXTERN;
4458                                                         }
4459                                                         break;
4460
4461                                                 default:
4462                                                         break;
4463                                         }
4464                                 } else if (is_type_incomplete(prev_type)) {
4465                                         prev_decl->type = type;
4466                                 }
4467
4468                                 if (old_storage_class == STORAGE_CLASS_EXTERN &&
4469                                                 new_storage_class == STORAGE_CLASS_EXTERN) {
4470
4471 warn_redundant_declaration: ;
4472                                         bool has_new_attrs
4473                                                 = has_new_attributes(prev_decl->attributes,
4474                                                                      decl->attributes);
4475                                         if (has_new_attrs) {
4476                                                 merge_in_attributes(decl, prev_decl->attributes);
4477                                         } else if (!is_definition        &&
4478                                                         warning.redundant_decls  &&
4479                                                         is_type_valid(prev_type) &&
4480                                                         strcmp(previous_entity->base.source_position.input_name,
4481                                                                 "<builtin>") != 0) {
4482                                                 warningf(pos,
4483                                                                 "redundant declaration for '%Y' (declared %P)",
4484                                                                 symbol, &previous_entity->base.source_position);
4485                                         }
4486                                 } else if (current_function == NULL) {
4487                                         if (old_storage_class != STORAGE_CLASS_STATIC &&
4488                                                         new_storage_class == STORAGE_CLASS_STATIC) {
4489                                                 errorf(pos,
4490                                                                 "static declaration of '%Y' follows non-static declaration (declared %P)",
4491                                                                 symbol, &previous_entity->base.source_position);
4492                                         } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4493                                                 prev_decl->storage_class          = STORAGE_CLASS_NONE;
4494                                                 prev_decl->declared_storage_class = STORAGE_CLASS_NONE;
4495                                         } else {
4496                                                 /* ISO/IEC 14882:1998(E) §C.1.2:1 */
4497                                                 if (c_mode & _CXX)
4498                                                         goto error_redeclaration;
4499                                                 goto warn_redundant_declaration;
4500                                         }
4501                                 } else if (is_type_valid(prev_type)) {
4502                                         if (old_storage_class == new_storage_class) {
4503 error_redeclaration:
4504                                                 errorf(pos, "redeclaration of '%Y' (declared %P)",
4505                                                                 symbol, &previous_entity->base.source_position);
4506                                         } else {
4507                                                 errorf(pos,
4508                                                                 "redeclaration of '%Y' with different linkage (declared %P)",
4509                                                                 symbol, &previous_entity->base.source_position);
4510                                         }
4511                                 }
4512                         }
4513
4514                         prev_decl->modifiers |= decl->modifiers;
4515                         if (entity->kind == ENTITY_FUNCTION) {
4516                                 previous_entity->function.is_inline |= entity->function.is_inline;
4517                         }
4518                         return previous_entity;
4519                 }
4520
4521                 if (warning.shadow) {
4522                         warningf(pos, "%s '%Y' shadows %s (declared %P)",
4523                                         get_entity_kind_name(entity->kind), symbol,
4524                                         get_entity_kind_name(previous_entity->kind),
4525                                         &previous_entity->base.source_position);
4526                 }
4527         }
4528
4529         if (entity->kind == ENTITY_FUNCTION) {
4530                 if (is_definition &&
4531                                 entity->declaration.storage_class != STORAGE_CLASS_STATIC) {
4532                         if (warning.missing_prototypes && !is_sym_main(symbol)) {
4533                                 warningf(pos, "no previous prototype for '%#T'",
4534                                          entity->declaration.type, symbol);
4535                         } else if (warning.missing_declarations && !is_sym_main(symbol)) {
4536                                 warningf(pos, "no previous declaration for '%#T'",
4537                                          entity->declaration.type, symbol);
4538                         }
4539                 }
4540         } else if (warning.missing_declarations &&
4541                         entity->kind == ENTITY_VARIABLE &&
4542                         current_scope == file_scope) {
4543                 declaration_t *declaration = &entity->declaration;
4544                 if (declaration->storage_class == STORAGE_CLASS_NONE) {
4545                         warningf(pos, "no previous declaration for '%#T'",
4546                                  declaration->type, symbol);
4547                 }
4548         }
4549
4550 finish:
4551         assert(entity->base.parent_scope == NULL);
4552         assert(current_scope != NULL);
4553
4554         entity->base.parent_scope = current_scope;
4555         entity->base.namespc      = NAMESPACE_NORMAL;
4556         environment_push(entity);
4557         append_entity(current_scope, entity);
4558
4559         return entity;
4560 }
4561
4562 static void parser_error_multiple_definition(entity_t *entity,
4563                 const source_position_t *source_position)
4564 {
4565         errorf(source_position, "multiple definition of '%Y' (declared %P)",
4566                entity->base.symbol, &entity->base.source_position);
4567 }
4568
4569 static bool is_declaration_specifier(const token_t *token,
4570                                      bool only_specifiers_qualifiers)
4571 {
4572         switch (token->type) {
4573                 TYPE_SPECIFIERS
4574                 TYPE_QUALIFIERS
4575                         return true;
4576                 case T_IDENTIFIER:
4577                         return is_typedef_symbol(token->v.symbol);
4578
4579                 case T___extension__:
4580                 STORAGE_CLASSES
4581                         return !only_specifiers_qualifiers;
4582
4583                 default:
4584                         return false;
4585         }
4586 }
4587
4588 static void parse_init_declarator_rest(entity_t *entity)
4589 {
4590         assert(is_declaration(entity));
4591         declaration_t *const declaration = &entity->declaration;
4592
4593         eat('=');
4594
4595         type_t *orig_type = declaration->type;
4596         type_t *type      = skip_typeref(orig_type);
4597
4598         if (entity->kind == ENTITY_VARIABLE
4599                         && entity->variable.initializer != NULL) {
4600                 parser_error_multiple_definition(entity, HERE);
4601         }
4602
4603         bool must_be_constant = false;
4604         if (declaration->storage_class == STORAGE_CLASS_STATIC ||
4605             entity->base.parent_scope  == file_scope) {
4606                 must_be_constant = true;
4607         }
4608
4609         if (is_type_function(type)) {
4610                 errorf(&entity->base.source_position,
4611                        "function '%#T' is initialized like a variable",
4612                        orig_type, entity->base.symbol);
4613                 orig_type = type_error_type;
4614         }
4615
4616         parse_initializer_env_t env;
4617         env.type             = orig_type;
4618         env.must_be_constant = must_be_constant;
4619         env.entity           = entity;
4620         current_init_decl    = entity;
4621
4622         initializer_t *initializer = parse_initializer(&env);
4623         current_init_decl = NULL;
4624
4625         if (entity->kind == ENTITY_VARIABLE) {
4626                 /* §6.7.5:22  array initializers for arrays with unknown size
4627                  * determine the array type size */
4628                 declaration->type            = env.type;
4629                 entity->variable.initializer = initializer;
4630         }
4631 }
4632
4633 /* parse rest of a declaration without any declarator */
4634 static void parse_anonymous_declaration_rest(
4635                 const declaration_specifiers_t *specifiers)
4636 {
4637         eat(';');
4638         anonymous_entity = NULL;
4639
4640         if (warning.other) {
4641                 if (specifiers->storage_class != STORAGE_CLASS_NONE ||
4642                                 specifiers->thread_local) {
4643                         warningf(&specifiers->source_position,
4644                                  "useless storage class in empty declaration");
4645                 }
4646
4647                 type_t *type = specifiers->type;
4648                 switch (type->kind) {
4649                         case TYPE_COMPOUND_STRUCT:
4650                         case TYPE_COMPOUND_UNION: {
4651                                 if (type->compound.compound->base.symbol == NULL) {
4652                                         warningf(&specifiers->source_position,
4653                                                  "unnamed struct/union that defines no instances");
4654                                 }
4655                                 break;
4656                         }
4657
4658                         case TYPE_ENUM:
4659                                 break;
4660
4661                         default:
4662                                 warningf(&specifiers->source_position, "empty declaration");
4663                                 break;
4664                 }
4665         }
4666 }
4667
4668 static void check_variable_type_complete(entity_t *ent)
4669 {
4670         if (ent->kind != ENTITY_VARIABLE)
4671                 return;
4672
4673         /* §6.7:7  If an identifier for an object is declared with no linkage, the
4674          *         type for the object shall be complete [...] */
4675         declaration_t *decl = &ent->declaration;
4676         if (decl->storage_class == STORAGE_CLASS_EXTERN ||
4677                         decl->storage_class == STORAGE_CLASS_STATIC)
4678                 return;
4679
4680         type_t *const orig_type = decl->type;
4681         type_t *const type      = skip_typeref(orig_type);
4682         if (!is_type_incomplete(type))
4683                 return;
4684
4685         /* §6.9.2:2 and §6.9.2:5: At the end of the translation incomplete arrays
4686          * are given length one. */
4687         if (is_type_array(type) && ent->base.parent_scope == file_scope) {
4688                 ARR_APP1(declaration_t*, incomplete_arrays, decl);
4689                 return;
4690         }
4691
4692         errorf(&ent->base.source_position, "variable '%#T' has incomplete type",
4693                         orig_type, ent->base.symbol);
4694 }
4695
4696
4697 static void parse_declaration_rest(entity_t *ndeclaration,
4698                 const declaration_specifiers_t *specifiers,
4699                 parsed_declaration_func         finished_declaration,
4700                 declarator_flags_t              flags)
4701 {
4702         add_anchor_token(';');
4703         add_anchor_token(',');
4704         while (true) {
4705                 entity_t *entity = finished_declaration(ndeclaration, token.type == '=');
4706
4707                 if (token.type == '=') {
4708                         parse_init_declarator_rest(entity);
4709                 } else if (entity->kind == ENTITY_VARIABLE) {
4710                         /* ISO/IEC 14882:1998(E) §8.5.3:3  The initializer can be omitted
4711                          * [...] where the extern specifier is explicitly used. */
4712                         declaration_t *decl = &entity->declaration;
4713                         if (decl->storage_class != STORAGE_CLASS_EXTERN) {
4714                                 type_t *type = decl->type;
4715                                 if (is_type_reference(skip_typeref(type))) {
4716                                         errorf(&entity->base.source_position,
4717                                                         "reference '%#T' must be initialized",
4718                                                         type, entity->base.symbol);
4719                                 }
4720                         }
4721                 }
4722
4723                 check_variable_type_complete(entity);
4724
4725                 if (token.type != ',')
4726                         break;
4727                 eat(',');
4728
4729                 add_anchor_token('=');
4730                 ndeclaration = parse_declarator(specifiers, flags);
4731                 rem_anchor_token('=');
4732         }
4733         expect(';', end_error);
4734
4735 end_error:
4736         anonymous_entity = NULL;
4737         rem_anchor_token(';');
4738         rem_anchor_token(',');
4739 }
4740
4741 static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition)
4742 {
4743         symbol_t *symbol = entity->base.symbol;
4744         if (symbol == NULL) {
4745                 errorf(HERE, "anonymous declaration not valid as function parameter");
4746                 return entity;
4747         }
4748
4749         assert(entity->base.namespc == NAMESPACE_NORMAL);
4750         entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL);
4751         if (previous_entity == NULL
4752                         || previous_entity->base.parent_scope != current_scope) {
4753                 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4754                        symbol);
4755                 return entity;
4756         }
4757
4758         if (is_definition) {
4759                 errorf(HERE, "parameter '%Y' is initialised", entity->base.symbol);
4760         }
4761
4762         return record_entity(entity, false);
4763 }
4764
4765 static void parse_declaration(parsed_declaration_func finished_declaration,
4766                               declarator_flags_t      flags)
4767 {
4768         declaration_specifiers_t specifiers;
4769         memset(&specifiers, 0, sizeof(specifiers));
4770
4771         add_anchor_token(';');
4772         parse_declaration_specifiers(&specifiers);
4773         rem_anchor_token(';');
4774
4775         if (token.type == ';') {
4776                 parse_anonymous_declaration_rest(&specifiers);
4777         } else {
4778                 entity_t *entity = parse_declarator(&specifiers, flags);
4779                 parse_declaration_rest(entity, &specifiers, finished_declaration, flags);
4780         }
4781 }
4782
4783 /* §6.5.2.2:6 */
4784 static type_t *get_default_promoted_type(type_t *orig_type)
4785 {
4786         type_t *result = orig_type;
4787
4788         type_t *type = skip_typeref(orig_type);
4789         if (is_type_integer(type)) {
4790                 result = promote_integer(type);
4791         } else if (is_type_atomic(type, ATOMIC_TYPE_FLOAT)) {
4792                 result = type_double;
4793         }
4794
4795         return result;
4796 }
4797
4798 static void parse_kr_declaration_list(entity_t *entity)
4799 {
4800         if (entity->kind != ENTITY_FUNCTION)
4801                 return;
4802
4803         type_t *type = skip_typeref(entity->declaration.type);
4804         assert(is_type_function(type));
4805         if (!type->function.kr_style_parameters)
4806                 return;
4807
4808         add_anchor_token('{');
4809
4810         /* push function parameters */
4811         size_t const  top       = environment_top();
4812         scope_t      *old_scope = scope_push(&entity->function.parameters);
4813
4814         entity_t *parameter = entity->function.parameters.entities;
4815         for ( ; parameter != NULL; parameter = parameter->base.next) {
4816                 assert(parameter->base.parent_scope == NULL);
4817                 parameter->base.parent_scope = current_scope;
4818                 environment_push(parameter);
4819         }
4820
4821         /* parse declaration list */
4822         for (;;) {
4823                 switch (token.type) {
4824                         DECLARATION_START
4825                         case T___extension__:
4826                         /* This covers symbols, which are no type, too, and results in
4827                          * better error messages.  The typical cases are misspelled type
4828                          * names and missing includes. */
4829                         case T_IDENTIFIER:
4830                                 parse_declaration(finished_kr_declaration, DECL_IS_PARAMETER);
4831                                 break;
4832                         default:
4833                                 goto decl_list_end;
4834                 }
4835         }
4836 decl_list_end:
4837
4838         /* pop function parameters */
4839         assert(current_scope == &entity->function.parameters);
4840         scope_pop(old_scope);
4841         environment_pop_to(top);
4842
4843         /* update function type */
4844         type_t *new_type = duplicate_type(type);
4845
4846         function_parameter_t  *parameters = NULL;
4847         function_parameter_t **anchor     = &parameters;
4848
4849         /* did we have an earlier prototype? */
4850         entity_t *proto_type = get_entity(entity->base.symbol, NAMESPACE_NORMAL);
4851         if (proto_type != NULL && proto_type->kind != ENTITY_FUNCTION)
4852                 proto_type = NULL;
4853
4854         function_parameter_t *proto_parameter = NULL;
4855         if (proto_type != NULL) {
4856                 type_t *proto_type_type = proto_type->declaration.type;
4857                 proto_parameter         = proto_type_type->function.parameters;
4858                 /* If a K&R function definition has a variadic prototype earlier, then
4859                  * make the function definition variadic, too. This should conform to
4860                  * §6.7.5.3:15 and §6.9.1:8. */
4861                 new_type->function.variadic = proto_type_type->function.variadic;
4862         } else {
4863                 /* §6.9.1.7: A K&R style parameter list does NOT act as a function
4864                  * prototype */
4865                 new_type->function.unspecified_parameters = true;
4866         }
4867
4868         bool need_incompatible_warning = false;
4869         parameter = entity->function.parameters.entities;
4870         for (; parameter != NULL; parameter = parameter->base.next,
4871                         proto_parameter =
4872                                 proto_parameter == NULL ? NULL : proto_parameter->next) {
4873                 if (parameter->kind != ENTITY_PARAMETER)
4874                         continue;
4875
4876                 type_t *parameter_type = parameter->declaration.type;
4877                 if (parameter_type == NULL) {
4878                         if (strict_mode) {
4879                                 errorf(HERE, "no type specified for function parameter '%Y'",
4880                                        parameter->base.symbol);
4881                                 parameter_type = type_error_type;
4882                         } else {
4883                                 if (warning.implicit_int) {
4884                                         warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4885                                                  parameter->base.symbol);
4886                                 }
4887                                 parameter_type = type_int;
4888                         }
4889                         parameter->declaration.type = parameter_type;
4890                 }
4891
4892                 semantic_parameter_incomplete(parameter);
4893
4894                 /* we need the default promoted types for the function type */
4895                 type_t *not_promoted = parameter_type;
4896                 parameter_type       = get_default_promoted_type(parameter_type);
4897
4898                 /* gcc special: if the type of the prototype matches the unpromoted
4899                  * type don't promote */
4900                 if (!strict_mode && proto_parameter != NULL) {
4901                         type_t *proto_p_type = skip_typeref(proto_parameter->type);
4902                         type_t *promo_skip   = skip_typeref(parameter_type);
4903                         type_t *param_skip   = skip_typeref(not_promoted);
4904                         if (!types_compatible(proto_p_type, promo_skip)
4905                                 && types_compatible(proto_p_type, param_skip)) {
4906                                 /* don't promote */
4907                                 need_incompatible_warning = true;
4908                                 parameter_type = not_promoted;
4909                         }
4910                 }
4911                 function_parameter_t *const parameter
4912                         = allocate_parameter(parameter_type);
4913
4914                 *anchor = parameter;
4915                 anchor  = &parameter->next;
4916         }
4917
4918         new_type->function.parameters = parameters;
4919         new_type = identify_new_type(new_type);
4920
4921         if (warning.other && need_incompatible_warning) {
4922                 type_t *proto_type_type = proto_type->declaration.type;
4923                 warningf(HERE,
4924                          "declaration '%#T' is incompatible with '%#T' (declared %P)",
4925                          proto_type_type, proto_type->base.symbol,
4926                          new_type, entity->base.symbol,
4927                          &proto_type->base.source_position);
4928         }
4929
4930         entity->declaration.type = new_type;
4931
4932         rem_anchor_token('{');
4933 }
4934
4935 static bool first_err = true;
4936
4937 /**
4938  * When called with first_err set, prints the name of the current function,
4939  * else does noting.
4940  */
4941 static void print_in_function(void)
4942 {
4943         if (first_err) {
4944                 first_err = false;
4945                 diagnosticf("%s: In function '%Y':\n",
4946                             current_function->base.base.source_position.input_name,
4947                             current_function->base.base.symbol);
4948         }
4949 }
4950
4951 /**
4952  * Check if all labels are defined in the current function.
4953  * Check if all labels are used in the current function.
4954  */
4955 static void check_labels(void)
4956 {
4957         for (const goto_statement_t *goto_statement = goto_first;
4958             goto_statement != NULL;
4959             goto_statement = goto_statement->next) {
4960                 /* skip computed gotos */
4961                 if (goto_statement->expression != NULL)
4962                         continue;
4963
4964                 label_t *label = goto_statement->label;
4965
4966                 label->used = true;
4967                 if (label->base.source_position.input_name == NULL) {
4968                         print_in_function();
4969                         errorf(&goto_statement->base.source_position,
4970                                "label '%Y' used but not defined", label->base.symbol);
4971                  }
4972         }
4973
4974         if (warning.unused_label) {
4975                 for (const label_statement_t *label_statement = label_first;
4976                          label_statement != NULL;
4977                          label_statement = label_statement->next) {
4978                         label_t *label = label_statement->label;
4979
4980                         if (! label->used) {
4981                                 print_in_function();
4982                                 warningf(&label_statement->base.source_position,
4983                                          "label '%Y' defined but not used", label->base.symbol);
4984                         }
4985                 }
4986         }
4987 }
4988
4989 static void warn_unused_entity(entity_t *entity, entity_t *last)
4990 {
4991         entity_t const *const end = last != NULL ? last->base.next : NULL;
4992         for (; entity != end; entity = entity->base.next) {
4993                 if (!is_declaration(entity))
4994                         continue;
4995
4996                 declaration_t *declaration = &entity->declaration;
4997                 if (declaration->implicit)
4998                         continue;
4999
5000                 if (!declaration->used) {
5001                         print_in_function();
5002                         const char *what = get_entity_kind_name(entity->kind);
5003                         warningf(&entity->base.source_position, "%s '%Y' is unused",
5004                                  what, entity->base.symbol);
5005                 } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) {
5006                         print_in_function();
5007                         const char *what = get_entity_kind_name(entity->kind);
5008                         warningf(&entity->base.source_position, "%s '%Y' is never read",
5009                                  what, entity->base.symbol);
5010                 }
5011         }
5012 }
5013
5014 static void check_unused_variables(statement_t *const stmt, void *const env)
5015 {
5016         (void)env;
5017
5018         switch (stmt->kind) {
5019                 case STATEMENT_DECLARATION: {
5020                         declaration_statement_t const *const decls = &stmt->declaration;
5021                         warn_unused_entity(decls->declarations_begin,
5022                                            decls->declarations_end);
5023                         return;
5024                 }
5025
5026                 case STATEMENT_FOR:
5027                         warn_unused_entity(stmt->fors.scope.entities, NULL);
5028                         return;
5029
5030                 default:
5031                         return;
5032         }
5033 }
5034
5035 /**
5036  * Check declarations of current_function for unused entities.
5037  */
5038 static void check_declarations(void)
5039 {
5040         if (warning.unused_parameter) {
5041                 const scope_t *scope = &current_function->parameters;
5042
5043                 /* do not issue unused warnings for main */
5044                 if (!is_sym_main(current_function->base.base.symbol)) {
5045                         warn_unused_entity(scope->entities, NULL);
5046                 }
5047         }
5048         if (warning.unused_variable) {
5049                 walk_statements(current_function->statement, check_unused_variables,
5050                                 NULL);
5051         }
5052 }
5053
5054 static int determine_truth(expression_t const* const cond)
5055 {
5056         return
5057                 !is_constant_expression(cond) ? 0 :
5058                 fold_constant_to_bool(cond)   ? 1 :
5059                 -1;
5060 }
5061
5062 static void check_reachable(statement_t *);
5063 static bool reaches_end;
5064
5065 static bool expression_returns(expression_t const *const expr)
5066 {
5067         switch (expr->kind) {
5068                 case EXPR_CALL: {
5069                         expression_t const *const func = expr->call.function;
5070                         if (func->kind == EXPR_REFERENCE) {
5071                                 entity_t *entity = func->reference.entity;
5072                                 if (entity->kind == ENTITY_FUNCTION
5073                                                 && entity->declaration.modifiers & DM_NORETURN)
5074                                         return false;
5075                         }
5076
5077                         if (!expression_returns(func))
5078                                 return false;
5079
5080                         for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) {
5081                                 if (!expression_returns(arg->expression))
5082                                         return false;
5083                         }
5084
5085                         return true;
5086                 }
5087
5088                 case EXPR_REFERENCE:
5089                 case EXPR_REFERENCE_ENUM_VALUE:
5090                 case EXPR_CONST:
5091                 case EXPR_CHARACTER_CONSTANT:
5092                 case EXPR_WIDE_CHARACTER_CONSTANT:
5093                 case EXPR_STRING_LITERAL:
5094                 case EXPR_WIDE_STRING_LITERAL:
5095                 case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers
5096                 case EXPR_LABEL_ADDRESS:
5097                 case EXPR_CLASSIFY_TYPE:
5098                 case EXPR_SIZEOF: // TODO handle obscure VLA case
5099                 case EXPR_ALIGNOF:
5100                 case EXPR_FUNCNAME:
5101                 case EXPR_BUILTIN_CONSTANT_P:
5102                 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
5103                 case EXPR_OFFSETOF:
5104                 case EXPR_INVALID:
5105                         return true;
5106
5107                 case EXPR_STATEMENT: {
5108                         bool old_reaches_end = reaches_end;
5109                         reaches_end = false;
5110                         check_reachable(expr->statement.statement);
5111                         bool returns = reaches_end;
5112                         reaches_end = old_reaches_end;
5113                         return returns;
5114                 }
5115
5116                 case EXPR_CONDITIONAL:
5117                         // TODO handle constant expression
5118
5119                         if (!expression_returns(expr->conditional.condition))
5120                                 return false;
5121
5122                         if (expr->conditional.true_expression != NULL
5123                                         && expression_returns(expr->conditional.true_expression))
5124                                 return true;
5125
5126                         return expression_returns(expr->conditional.false_expression);
5127
5128                 case EXPR_SELECT:
5129                         return expression_returns(expr->select.compound);
5130
5131                 case EXPR_ARRAY_ACCESS:
5132                         return
5133                                 expression_returns(expr->array_access.array_ref) &&
5134                                 expression_returns(expr->array_access.index);
5135
5136                 case EXPR_VA_START:
5137                         return expression_returns(expr->va_starte.ap);
5138
5139                 case EXPR_VA_ARG:
5140                         return expression_returns(expr->va_arge.ap);
5141
5142                 case EXPR_VA_COPY:
5143                         return expression_returns(expr->va_copye.src);
5144
5145                 EXPR_UNARY_CASES_MANDATORY
5146                         return expression_returns(expr->unary.value);
5147
5148                 case EXPR_UNARY_THROW:
5149                         return false;
5150
5151                 EXPR_BINARY_CASES
5152                         // TODO handle constant lhs of && and ||
5153                         return
5154                                 expression_returns(expr->binary.left) &&
5155                                 expression_returns(expr->binary.right);
5156
5157                 case EXPR_UNKNOWN:
5158                         break;
5159         }
5160
5161         panic("unhandled expression");
5162 }
5163
5164 static bool initializer_returns(initializer_t const *const init)
5165 {
5166         switch (init->kind) {
5167                 case INITIALIZER_VALUE:
5168                         return expression_returns(init->value.value);
5169
5170                 case INITIALIZER_LIST: {
5171                         initializer_t * const*       i       = init->list.initializers;
5172                         initializer_t * const* const end     = i + init->list.len;
5173                         bool                         returns = true;
5174                         for (; i != end; ++i) {
5175                                 if (!initializer_returns(*i))
5176                                         returns = false;
5177                         }
5178                         return returns;
5179                 }
5180
5181                 case INITIALIZER_STRING:
5182                 case INITIALIZER_WIDE_STRING:
5183                 case INITIALIZER_DESIGNATOR: // designators have no payload
5184                         return true;
5185         }
5186         panic("unhandled initializer");
5187 }
5188
5189 static bool noreturn_candidate;
5190
5191 static void check_reachable(statement_t *const stmt)
5192 {
5193         if (stmt->base.reachable)
5194                 return;
5195         if (stmt->kind != STATEMENT_DO_WHILE)
5196                 stmt->base.reachable = true;
5197
5198         statement_t *last = stmt;
5199         statement_t *next;
5200         switch (stmt->kind) {
5201                 case STATEMENT_INVALID:
5202                 case STATEMENT_EMPTY:
5203                 case STATEMENT_ASM:
5204                         next = stmt->base.next;
5205                         break;
5206
5207                 case STATEMENT_DECLARATION: {
5208                         declaration_statement_t const *const decl = &stmt->declaration;
5209                         entity_t                const *      ent  = decl->declarations_begin;
5210                         entity_t                const *const last = decl->declarations_end;
5211                         if (ent != NULL) {
5212                                 for (;; ent = ent->base.next) {
5213                                         if (ent->kind                 == ENTITY_VARIABLE &&
5214                                                         ent->variable.initializer != NULL            &&
5215                                                         !initializer_returns(ent->variable.initializer)) {
5216                                                 return;
5217                                         }
5218                                         if (ent == last)
5219                                                 break;
5220                                 }
5221                         }
5222                         next = stmt->base.next;
5223                         break;
5224                 }
5225
5226                 case STATEMENT_COMPOUND:
5227                         next = stmt->compound.statements;
5228                         if (next == NULL)
5229                                 next = stmt->base.next;
5230                         break;
5231
5232                 case STATEMENT_RETURN: {
5233                         expression_t const *const val = stmt->returns.value;
5234                         if (val == NULL || expression_returns(val))
5235                                 noreturn_candidate = false;
5236                         return;
5237                 }
5238
5239                 case STATEMENT_IF: {
5240                         if_statement_t const *const ifs  = &stmt->ifs;
5241                         expression_t   const *const cond = ifs->condition;
5242
5243                         if (!expression_returns(cond))
5244                                 return;
5245
5246                         int const val = determine_truth(cond);
5247
5248                         if (val >= 0)
5249                                 check_reachable(ifs->true_statement);
5250
5251                         if (val > 0)
5252                                 return;
5253
5254                         if (ifs->false_statement != NULL) {
5255                                 check_reachable(ifs->false_statement);
5256                                 return;
5257                         }
5258
5259                         next = stmt->base.next;
5260                         break;
5261                 }
5262
5263                 case STATEMENT_SWITCH: {
5264                         switch_statement_t const *const switchs = &stmt->switchs;
5265                         expression_t       const *const expr    = switchs->expression;
5266
5267                         if (!expression_returns(expr))
5268                                 return;
5269
5270                         if (is_constant_expression(expr)) {
5271                                 long                    const val      = fold_constant_to_int(expr);
5272                                 case_label_statement_t *      defaults = NULL;
5273                                 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5274                                         if (i->expression == NULL) {
5275                                                 defaults = i;
5276                                                 continue;
5277                                         }
5278
5279                                         if (i->first_case <= val && val <= i->last_case) {
5280                                                 check_reachable((statement_t*)i);
5281                                                 return;
5282                                         }
5283                                 }
5284
5285                                 if (defaults != NULL) {
5286                                         check_reachable((statement_t*)defaults);
5287                                         return;
5288                                 }
5289                         } else {
5290                                 bool has_default = false;
5291                                 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5292                                         if (i->expression == NULL)
5293                                                 has_default = true;
5294
5295                                         check_reachable((statement_t*)i);
5296                                 }
5297
5298                                 if (has_default)
5299                                         return;
5300                         }
5301
5302                         next = stmt->base.next;
5303                         break;
5304                 }
5305
5306                 case STATEMENT_EXPRESSION: {
5307                         /* Check for noreturn function call */
5308                         expression_t const *const expr = stmt->expression.expression;
5309                         if (!expression_returns(expr))
5310                                 return;
5311
5312                         next = stmt->base.next;
5313                         break;
5314                 }
5315
5316                 case STATEMENT_CONTINUE:
5317                         for (statement_t *parent = stmt;;) {
5318                                 parent = parent->base.parent;
5319                                 if (parent == NULL) /* continue not within loop */
5320                                         return;
5321
5322                                 next = parent;
5323                                 switch (parent->kind) {
5324                                         case STATEMENT_WHILE:    goto continue_while;
5325                                         case STATEMENT_DO_WHILE: goto continue_do_while;
5326                                         case STATEMENT_FOR:      goto continue_for;
5327
5328                                         default: break;
5329                                 }
5330                         }
5331
5332                 case STATEMENT_BREAK:
5333                         for (statement_t *parent = stmt;;) {
5334                                 parent = parent->base.parent;
5335                                 if (parent == NULL) /* break not within loop/switch */
5336                                         return;
5337
5338                                 switch (parent->kind) {
5339                                         case STATEMENT_SWITCH:
5340                                         case STATEMENT_WHILE:
5341                                         case STATEMENT_DO_WHILE:
5342                                         case STATEMENT_FOR:
5343                                                 last = parent;
5344                                                 next = parent->base.next;
5345                                                 goto found_break_parent;
5346
5347                                         default: break;
5348                                 }
5349                         }
5350 found_break_parent:
5351                         break;
5352
5353                 case STATEMENT_GOTO:
5354                         if (stmt->gotos.expression) {
5355                                 if (!expression_returns(stmt->gotos.expression))
5356                                         return;
5357
5358                                 statement_t *parent = stmt->base.parent;
5359                                 if (parent == NULL) /* top level goto */
5360                                         return;
5361                                 next = parent;
5362                         } else {
5363                                 next = stmt->gotos.label->statement;
5364                                 if (next == NULL) /* missing label */
5365                                         return;
5366                         }
5367                         break;
5368
5369                 case STATEMENT_LABEL:
5370                         next = stmt->label.statement;
5371                         break;
5372
5373                 case STATEMENT_CASE_LABEL:
5374                         next = stmt->case_label.statement;
5375                         break;
5376
5377                 case STATEMENT_WHILE: {
5378                         while_statement_t const *const whiles = &stmt->whiles;
5379                         expression_t      const *const cond   = whiles->condition;
5380
5381                         if (!expression_returns(cond))
5382                                 return;
5383
5384                         int const val = determine_truth(cond);
5385
5386                         if (val >= 0)
5387                                 check_reachable(whiles->body);
5388
5389                         if (val > 0)
5390                                 return;
5391
5392                         next = stmt->base.next;
5393                         break;
5394                 }
5395
5396                 case STATEMENT_DO_WHILE:
5397                         next = stmt->do_while.body;
5398                         break;
5399
5400                 case STATEMENT_FOR: {
5401                         for_statement_t *const fors = &stmt->fors;
5402
5403                         if (fors->condition_reachable)
5404                                 return;
5405                         fors->condition_reachable = true;
5406
5407                         expression_t const *const cond = fors->condition;
5408
5409                         int val;
5410                         if (cond == NULL) {
5411                                 val = 1;
5412                         } else if (expression_returns(cond)) {
5413                                 val = determine_truth(cond);
5414                         } else {
5415                                 return;
5416                         }
5417
5418                         if (val >= 0)
5419                                 check_reachable(fors->body);
5420
5421                         if (val > 0)
5422                                 return;
5423
5424                         next = stmt->base.next;
5425                         break;
5426                 }
5427
5428                 case STATEMENT_MS_TRY: {
5429                         ms_try_statement_t const *const ms_try = &stmt->ms_try;
5430                         check_reachable(ms_try->try_statement);
5431                         next = ms_try->final_statement;
5432                         break;
5433                 }
5434
5435                 case STATEMENT_LEAVE: {
5436                         statement_t *parent = stmt;
5437                         for (;;) {
5438                                 parent = parent->base.parent;
5439                                 if (parent == NULL) /* __leave not within __try */
5440                                         return;
5441
5442                                 if (parent->kind == STATEMENT_MS_TRY) {
5443                                         last = parent;
5444                                         next = parent->ms_try.final_statement;
5445                                         break;
5446                                 }
5447                         }
5448                         break;
5449                 }
5450
5451                 default:
5452                         panic("invalid statement kind");
5453         }
5454
5455         while (next == NULL) {
5456                 next = last->base.parent;
5457                 if (next == NULL) {
5458                         noreturn_candidate = false;
5459
5460                         type_t *const type = skip_typeref(current_function->base.type);
5461                         assert(is_type_function(type));
5462                         type_t *const ret  = skip_typeref(type->function.return_type);
5463                         if (warning.return_type                    &&
5464                             !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5465                             is_type_valid(ret)                     &&
5466                             !is_sym_main(current_function->base.base.symbol)) {
5467                                 warningf(&stmt->base.source_position,
5468                                          "control reaches end of non-void function");
5469                         }
5470                         return;
5471                 }
5472
5473                 switch (next->kind) {
5474                         case STATEMENT_INVALID:
5475                         case STATEMENT_EMPTY:
5476                         case STATEMENT_DECLARATION:
5477                         case STATEMENT_EXPRESSION:
5478                         case STATEMENT_ASM:
5479                         case STATEMENT_RETURN:
5480                         case STATEMENT_CONTINUE:
5481                         case STATEMENT_BREAK:
5482                         case STATEMENT_GOTO:
5483                         case STATEMENT_LEAVE:
5484                                 panic("invalid control flow in function");
5485
5486                         case STATEMENT_COMPOUND:
5487                                 if (next->compound.stmt_expr) {
5488                                         reaches_end = true;
5489                                         return;
5490                                 }
5491                                 /* FALLTHROUGH */
5492                         case STATEMENT_IF:
5493                         case STATEMENT_SWITCH:
5494                         case STATEMENT_LABEL:
5495                         case STATEMENT_CASE_LABEL:
5496                                 last = next;
5497                                 next = next->base.next;
5498                                 break;
5499
5500                         case STATEMENT_WHILE: {
5501 continue_while:
5502                                 if (next->base.reachable)
5503                                         return;
5504                                 next->base.reachable = true;
5505
5506                                 while_statement_t const *const whiles = &next->whiles;
5507                                 expression_t      const *const cond   = whiles->condition;
5508
5509                                 if (!expression_returns(cond))
5510                                         return;
5511
5512                                 int const val = determine_truth(cond);
5513
5514                                 if (val >= 0)
5515                                         check_reachable(whiles->body);
5516
5517                                 if (val > 0)
5518                                         return;
5519
5520                                 last = next;
5521                                 next = next->base.next;
5522                                 break;
5523                         }
5524
5525                         case STATEMENT_DO_WHILE: {
5526 continue_do_while:
5527                                 if (next->base.reachable)
5528                                         return;
5529                                 next->base.reachable = true;
5530
5531                                 do_while_statement_t const *const dw   = &next->do_while;
5532                                 expression_t         const *const cond = dw->condition;
5533
5534                                 if (!expression_returns(cond))
5535                                         return;
5536
5537                                 int const val = determine_truth(cond);
5538
5539                                 if (val >= 0)
5540                                         check_reachable(dw->body);
5541
5542                                 if (val > 0)
5543                                         return;
5544
5545                                 last = next;
5546                                 next = next->base.next;
5547                                 break;
5548                         }
5549
5550                         case STATEMENT_FOR: {
5551 continue_for:;
5552                                 for_statement_t *const fors = &next->fors;
5553
5554                                 fors->step_reachable = true;
5555
5556                                 if (fors->condition_reachable)
5557                                         return;
5558                                 fors->condition_reachable = true;
5559
5560                                 expression_t const *const cond = fors->condition;
5561
5562                                 int val;
5563                                 if (cond == NULL) {
5564                                         val = 1;
5565                                 } else if (expression_returns(cond)) {
5566                                         val = determine_truth(cond);
5567                                 } else {
5568                                         return;
5569                                 }
5570
5571                                 if (val >= 0)
5572                                         check_reachable(fors->body);
5573
5574                                 if (val > 0)
5575                                         return;
5576
5577                                 last = next;
5578                                 next = next->base.next;
5579                                 break;
5580                         }
5581
5582                         case STATEMENT_MS_TRY:
5583                                 last = next;
5584                                 next = next->ms_try.final_statement;
5585                                 break;
5586                 }
5587         }
5588
5589         check_reachable(next);
5590 }
5591
5592 static void check_unreachable(statement_t* const stmt, void *const env)
5593 {
5594         (void)env;
5595
5596         switch (stmt->kind) {
5597                 case STATEMENT_DO_WHILE:
5598                         if (!stmt->base.reachable) {
5599                                 expression_t const *const cond = stmt->do_while.condition;
5600                                 if (determine_truth(cond) >= 0) {
5601                                         warningf(&cond->base.source_position,
5602                                                  "condition of do-while-loop is unreachable");
5603                                 }
5604                         }
5605                         return;
5606
5607                 case STATEMENT_FOR: {
5608                         for_statement_t const* const fors = &stmt->fors;
5609
5610                         // if init and step are unreachable, cond is unreachable, too
5611                         if (!stmt->base.reachable && !fors->step_reachable) {
5612                                 warningf(&stmt->base.source_position, "statement is unreachable");
5613                         } else {
5614                                 if (!stmt->base.reachable && fors->initialisation != NULL) {
5615                                         warningf(&fors->initialisation->base.source_position,
5616                                                  "initialisation of for-statement is unreachable");
5617                                 }
5618
5619                                 if (!fors->condition_reachable && fors->condition != NULL) {
5620                                         warningf(&fors->condition->base.source_position,
5621                                                  "condition of for-statement is unreachable");
5622                                 }
5623
5624                                 if (!fors->step_reachable && fors->step != NULL) {
5625                                         warningf(&fors->step->base.source_position,
5626                                                  "step of for-statement is unreachable");
5627                                 }
5628                         }
5629                         return;
5630                 }
5631
5632                 case STATEMENT_COMPOUND:
5633                         if (stmt->compound.statements != NULL)
5634                                 return;
5635                         goto warn_unreachable;
5636
5637                 case STATEMENT_DECLARATION: {
5638                         /* Only warn if there is at least one declarator with an initializer.
5639                          * This typically occurs in switch statements. */
5640                         declaration_statement_t const *const decl = &stmt->declaration;
5641                         entity_t                const *      ent  = decl->declarations_begin;
5642                         entity_t                const *const last = decl->declarations_end;
5643                         if (ent != NULL) {
5644                                 for (;; ent = ent->base.next) {
5645                                         if (ent->kind                 == ENTITY_VARIABLE &&
5646                                                         ent->variable.initializer != NULL) {
5647                                                 goto warn_unreachable;
5648                                         }
5649                                         if (ent == last)
5650                                                 return;
5651                                 }
5652                         }
5653                 }
5654
5655                 default:
5656 warn_unreachable:
5657                         if (!stmt->base.reachable)
5658                                 warningf(&stmt->base.source_position, "statement is unreachable");
5659                         return;
5660         }
5661 }
5662
5663 static void parse_external_declaration(void)
5664 {
5665         /* function-definitions and declarations both start with declaration
5666          * specifiers */
5667         declaration_specifiers_t specifiers;
5668         memset(&specifiers, 0, sizeof(specifiers));
5669
5670         add_anchor_token(';');
5671         parse_declaration_specifiers(&specifiers);
5672         rem_anchor_token(';');
5673
5674         /* must be a declaration */
5675         if (token.type == ';') {
5676                 parse_anonymous_declaration_rest(&specifiers);
5677                 return;
5678         }
5679
5680         add_anchor_token(',');
5681         add_anchor_token('=');
5682         add_anchor_token(';');
5683         add_anchor_token('{');
5684
5685         /* declarator is common to both function-definitions and declarations */
5686         entity_t *ndeclaration = parse_declarator(&specifiers, DECL_FLAGS_NONE);
5687
5688         rem_anchor_token('{');
5689         rem_anchor_token(';');
5690         rem_anchor_token('=');
5691         rem_anchor_token(',');
5692
5693         /* must be a declaration */
5694         switch (token.type) {
5695                 case ',':
5696                 case ';':
5697                 case '=':
5698                         parse_declaration_rest(ndeclaration, &specifiers, record_entity,
5699                                         DECL_FLAGS_NONE);
5700                         return;
5701         }
5702
5703         /* must be a function definition */
5704         parse_kr_declaration_list(ndeclaration);
5705
5706         if (token.type != '{') {
5707                 parse_error_expected("while parsing function definition", '{', NULL);
5708                 eat_until_matching_token(';');
5709                 return;
5710         }
5711
5712         assert(is_declaration(ndeclaration));
5713         type_t *const orig_type = ndeclaration->declaration.type;
5714         type_t *      type      = skip_typeref(orig_type);
5715
5716         if (!is_type_function(type)) {
5717                 if (is_type_valid(type)) {
5718                         errorf(HERE, "declarator '%#T' has a body but is not a function type",
5719                                type, ndeclaration->base.symbol);
5720                 }
5721                 eat_block();
5722                 return;
5723         } else if (is_typeref(orig_type)) {
5724                 /* §6.9.1:2 */
5725                 errorf(&ndeclaration->base.source_position,
5726                                 "type of function definition '%#T' is a typedef",
5727                                 orig_type, ndeclaration->base.symbol);
5728         }
5729
5730         if (warning.aggregate_return &&
5731             is_type_compound(skip_typeref(type->function.return_type))) {
5732                 warningf(HERE, "function '%Y' returns an aggregate",
5733                          ndeclaration->base.symbol);
5734         }
5735         if (warning.traditional && !type->function.unspecified_parameters) {
5736                 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
5737                         ndeclaration->base.symbol);
5738         }
5739         if (warning.old_style_definition && type->function.unspecified_parameters) {
5740                 warningf(HERE, "old-style function definition '%Y'",
5741                         ndeclaration->base.symbol);
5742         }
5743
5744         /* §6.7.5.3:14 a function definition with () means no
5745          * parameters (and not unspecified parameters) */
5746         if (type->function.unspecified_parameters &&
5747                         type->function.parameters == NULL) {
5748                 type_t *copy                          = duplicate_type(type);
5749                 copy->function.unspecified_parameters = false;
5750                 type                                  = identify_new_type(copy);
5751
5752                 ndeclaration->declaration.type = type;
5753         }
5754
5755         entity_t *const entity = record_entity(ndeclaration, true);
5756         assert(entity->kind == ENTITY_FUNCTION);
5757         assert(ndeclaration->kind == ENTITY_FUNCTION);
5758
5759         function_t *function = &entity->function;
5760         if (ndeclaration != entity) {
5761                 function->parameters = ndeclaration->function.parameters;
5762         }
5763         assert(is_declaration(entity));
5764         type = skip_typeref(entity->declaration.type);
5765
5766         /* push function parameters and switch scope */
5767         size_t const  top       = environment_top();
5768         scope_t      *old_scope = scope_push(&function->parameters);
5769
5770         entity_t *parameter = function->parameters.entities;
5771         for (; parameter != NULL; parameter = parameter->base.next) {
5772                 if (parameter->base.parent_scope == &ndeclaration->function.parameters) {
5773                         parameter->base.parent_scope = current_scope;
5774                 }
5775                 assert(parameter->base.parent_scope == NULL
5776                                 || parameter->base.parent_scope == current_scope);
5777                 parameter->base.parent_scope = current_scope;
5778                 if (parameter->base.symbol == NULL) {
5779                         errorf(&parameter->base.source_position, "parameter name omitted");
5780                         continue;
5781                 }
5782                 environment_push(parameter);
5783         }
5784
5785         if (function->statement != NULL) {
5786                 parser_error_multiple_definition(entity, HERE);
5787                 eat_block();
5788         } else {
5789                 /* parse function body */
5790                 int         label_stack_top      = label_top();
5791                 function_t *old_current_function = current_function;
5792                 current_function                 = function;
5793                 current_parent                   = NULL;
5794
5795                 goto_first   = NULL;
5796                 goto_anchor  = &goto_first;
5797                 label_first  = NULL;
5798                 label_anchor = &label_first;
5799
5800                 statement_t *const body = parse_compound_statement(false);
5801                 function->statement = body;
5802                 first_err = true;
5803                 check_labels();
5804                 check_declarations();
5805                 if (warning.return_type      ||
5806                     warning.unreachable_code ||
5807                     (warning.missing_noreturn
5808                      && !(function->base.modifiers & DM_NORETURN))) {
5809                         noreturn_candidate = true;
5810                         check_reachable(body);
5811                         if (warning.unreachable_code)
5812                                 walk_statements(body, check_unreachable, NULL);
5813                         if (warning.missing_noreturn &&
5814                             noreturn_candidate       &&
5815                             !(function->base.modifiers & DM_NORETURN)) {
5816                                 warningf(&body->base.source_position,
5817                                          "function '%#T' is candidate for attribute 'noreturn'",
5818                                          type, entity->base.symbol);
5819                         }
5820                 }
5821
5822                 assert(current_parent   == NULL);
5823                 assert(current_function == function);
5824                 current_function = old_current_function;
5825                 label_pop_to(label_stack_top);
5826         }
5827
5828         assert(current_scope == &function->parameters);
5829         scope_pop(old_scope);
5830         environment_pop_to(top);
5831 }
5832
5833 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
5834                                   source_position_t *source_position,
5835                                   const symbol_t *symbol)
5836 {
5837         type_t *type = allocate_type_zero(TYPE_BITFIELD);
5838
5839         type->bitfield.base_type       = base_type;
5840         type->bitfield.size_expression = size;
5841
5842         il_size_t bit_size;
5843         type_t *skipped_type = skip_typeref(base_type);
5844         if (!is_type_integer(skipped_type)) {
5845                 errorf(HERE, "bitfield base type '%T' is not an integer type",
5846                         base_type);
5847                 bit_size = 0;
5848         } else {
5849                 bit_size = get_type_size(base_type) * 8;
5850         }
5851
5852         if (is_constant_expression(size)) {
5853                 long v = fold_constant_to_int(size);
5854                 const symbol_t *user_symbol = symbol == NULL ? sym_anonymous : symbol;
5855
5856                 if (v < 0) {
5857                         errorf(source_position, "negative width in bit-field '%Y'",
5858                                user_symbol);
5859                 } else if (v == 0 && symbol != NULL) {
5860                         errorf(source_position, "zero width for bit-field '%Y'",
5861                                user_symbol);
5862                 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
5863                         errorf(source_position, "width of '%Y' exceeds its type",
5864                                user_symbol);
5865                 } else {
5866                         type->bitfield.bit_size = v;
5867                 }
5868         }
5869
5870         return type;
5871 }
5872
5873 static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol)
5874 {
5875         entity_t *iter = compound->members.entities;
5876         for (; iter != NULL; iter = iter->base.next) {
5877                 if (iter->kind != ENTITY_COMPOUND_MEMBER)
5878                         continue;
5879
5880                 if (iter->base.symbol == symbol) {
5881                         return iter;
5882                 } else if (iter->base.symbol == NULL) {
5883                         /* search in anonymous structs and unions */
5884                         type_t *type = skip_typeref(iter->declaration.type);
5885                         if (is_type_compound(type)) {
5886                                 if (find_compound_entry(type->compound.compound, symbol)
5887                                                 != NULL)
5888                                         return iter;
5889                         }
5890                         continue;
5891                 }
5892         }
5893
5894         return NULL;
5895 }
5896
5897 static void check_deprecated(const source_position_t *source_position,
5898                              const entity_t *entity)
5899 {
5900         if (!warning.deprecated_declarations)
5901                 return;
5902         if (!is_declaration(entity))
5903                 return;
5904         if ((entity->declaration.modifiers & DM_DEPRECATED) == 0)
5905                 return;
5906
5907         char const *const prefix = get_entity_kind_name(entity->kind);
5908         const char *deprecated_string
5909                         = get_deprecated_string(entity->declaration.attributes);
5910         if (deprecated_string != NULL) {
5911                 warningf(source_position, "%s '%Y' is deprecated (declared %P): \"%s\"",
5912                                  prefix, entity->base.symbol, &entity->base.source_position,
5913                                  deprecated_string);
5914         } else {
5915                 warningf(source_position, "%s '%Y' is deprecated (declared %P)", prefix,
5916                                  entity->base.symbol, &entity->base.source_position);
5917         }
5918 }
5919
5920
5921 static expression_t *create_select(const source_position_t *pos,
5922                                    expression_t *addr,
5923                                    type_qualifiers_t qualifiers,
5924                                                                    entity_t *entry)
5925 {
5926         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
5927
5928         check_deprecated(pos, entry);
5929
5930         expression_t *select          = allocate_expression_zero(EXPR_SELECT);
5931         select->select.compound       = addr;
5932         select->select.compound_entry = entry;
5933
5934         type_t *entry_type = entry->declaration.type;
5935         type_t *res_type   = get_qualified_type(entry_type, qualifiers);
5936
5937         /* we always do the auto-type conversions; the & and sizeof parser contains
5938          * code to revert this! */
5939         select->base.type = automatic_type_conversion(res_type);
5940         if (res_type->kind == TYPE_BITFIELD) {
5941                 select->base.type = res_type->bitfield.base_type;
5942         }
5943
5944         return select;
5945 }
5946
5947 /**
5948  * Find entry with symbol in compound. Search anonymous structs and unions and
5949  * creates implicit select expressions for them.
5950  * Returns the adress for the innermost compound.
5951  */
5952 static expression_t *find_create_select(const source_position_t *pos,
5953                                         expression_t *addr,
5954                                         type_qualifiers_t qualifiers,
5955                                         compound_t *compound, symbol_t *symbol)
5956 {
5957         entity_t *iter = compound->members.entities;
5958         for (; iter != NULL; iter = iter->base.next) {
5959                 if (iter->kind != ENTITY_COMPOUND_MEMBER)
5960                         continue;
5961
5962                 symbol_t *iter_symbol = iter->base.symbol;
5963                 if (iter_symbol == NULL) {
5964                         type_t *type = iter->declaration.type;
5965                         if (type->kind != TYPE_COMPOUND_STRUCT
5966                                         && type->kind != TYPE_COMPOUND_UNION)
5967                                 continue;
5968
5969                         compound_t *sub_compound = type->compound.compound;
5970
5971                         if (find_compound_entry(sub_compound, symbol) == NULL)
5972                                 continue;
5973
5974                         expression_t *sub_addr = create_select(pos, addr, qualifiers, iter);
5975                         sub_addr->base.source_position = *pos;
5976                         sub_addr->select.implicit      = true;
5977                         return find_create_select(pos, sub_addr, qualifiers, sub_compound,
5978                                                   symbol);
5979                 }
5980
5981                 if (iter_symbol == symbol) {
5982                         return create_select(pos, addr, qualifiers, iter);
5983                 }
5984         }
5985
5986         return NULL;
5987 }
5988
5989 static void parse_compound_declarators(compound_t *compound,
5990                 const declaration_specifiers_t *specifiers)
5991 {
5992         while (true) {
5993                 entity_t *entity;
5994
5995                 if (token.type == ':') {
5996                         source_position_t source_position = *HERE;
5997                         next_token();
5998
5999                         type_t *base_type = specifiers->type;
6000                         expression_t *size = parse_constant_expression();
6001
6002                         type_t *type = make_bitfield_type(base_type, size,
6003                                         &source_position, NULL);
6004
6005                         attribute_t *attributes = parse_attributes(NULL);
6006                         if (attributes != NULL) {
6007                                 attribute_t *last = attributes;
6008                                 while (last->next != NULL)
6009                                         last = last->next;
6010                                 last->next = specifiers->attributes;
6011                         } else {
6012                                 attributes = specifiers->attributes;
6013                         }
6014
6015                         entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER);
6016                         entity->base.namespc                       = NAMESPACE_NORMAL;
6017                         entity->base.source_position               = source_position;
6018                         entity->declaration.declared_storage_class = STORAGE_CLASS_NONE;
6019                         entity->declaration.storage_class          = STORAGE_CLASS_NONE;
6020                         entity->declaration.type                   = type;
6021                         entity->declaration.attributes             = attributes;
6022
6023                         if (attributes != NULL) {
6024                                 handle_entity_attributes(attributes, entity);
6025                         }
6026                         append_entity(&compound->members, entity);
6027                 } else {
6028                         entity = parse_declarator(specifiers,
6029                                         DECL_MAY_BE_ABSTRACT | DECL_CREATE_COMPOUND_MEMBER);
6030                         if (entity->kind == ENTITY_TYPEDEF) {
6031                                 errorf(&entity->base.source_position,
6032                                                 "typedef not allowed as compound member");
6033                         } else {
6034                                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
6035
6036                                 /* make sure we don't define a symbol multiple times */
6037                                 symbol_t *symbol = entity->base.symbol;
6038                                 if (symbol != NULL) {
6039                                         entity_t *prev = find_compound_entry(compound, symbol);
6040                                         if (prev != NULL) {
6041                                                 errorf(&entity->base.source_position,
6042                                                                 "multiple declarations of symbol '%Y' (declared %P)",
6043                                                                 symbol, &prev->base.source_position);
6044                                         }
6045                                 }
6046
6047                                 if (token.type == ':') {
6048                                         source_position_t source_position = *HERE;
6049                                         next_token();
6050                                         expression_t *size = parse_constant_expression();
6051
6052                                         type_t *type          = entity->declaration.type;
6053                                         type_t *bitfield_type = make_bitfield_type(type, size,
6054                                                         &source_position, entity->base.symbol);
6055
6056                                         attribute_t *attributes = parse_attributes(NULL);
6057                                         entity->declaration.type = bitfield_type;
6058                                         handle_entity_attributes(attributes, entity);
6059                                 } else {
6060                                         type_t *orig_type = entity->declaration.type;
6061                                         type_t *type      = skip_typeref(orig_type);
6062                                         if (is_type_function(type)) {
6063                                                 errorf(&entity->base.source_position,
6064                                                                 "compound member '%Y' must not have function type '%T'",
6065                                                                 entity->base.symbol, orig_type);
6066                                         } else if (is_type_incomplete(type)) {
6067                                                 /* §6.7.2.1:16 flexible array member */
6068                                                 if (!is_type_array(type)       ||
6069                                                                 token.type          != ';' ||
6070                                                                 look_ahead(1)->type != '}') {
6071                                                         errorf(&entity->base.source_position,
6072                                                                         "compound member '%Y' has incomplete type '%T'",
6073                                                                         entity->base.symbol, orig_type);
6074                                                 }
6075                                         }
6076                                 }
6077
6078                                 append_entity(&compound->members, entity);
6079                         }
6080                 }
6081
6082                 if (token.type != ',')
6083                         break;
6084                 next_token();
6085         }
6086         expect(';', end_error);
6087
6088 end_error:
6089         anonymous_entity = NULL;
6090 }
6091
6092 static void parse_compound_type_entries(compound_t *compound)
6093 {
6094         eat('{');
6095         add_anchor_token('}');
6096
6097         while (token.type != '}') {
6098                 if (token.type == T_EOF) {
6099                         errorf(HERE, "EOF while parsing struct");
6100                         break;
6101                 }
6102                 declaration_specifiers_t specifiers;
6103                 memset(&specifiers, 0, sizeof(specifiers));
6104                 parse_declaration_specifiers(&specifiers);
6105
6106                 parse_compound_declarators(compound, &specifiers);
6107         }
6108         rem_anchor_token('}');
6109         next_token();
6110
6111         /* §6.7.2.1:7 */
6112         compound->complete = true;
6113 }
6114
6115 static type_t *parse_typename(void)
6116 {
6117         declaration_specifiers_t specifiers;
6118         memset(&specifiers, 0, sizeof(specifiers));
6119         parse_declaration_specifiers(&specifiers);
6120         if (specifiers.storage_class != STORAGE_CLASS_NONE ||
6121                         specifiers.thread_local) {
6122                 /* TODO: improve error message, user does probably not know what a
6123                  * storage class is...
6124                  */
6125                 errorf(HERE, "typename may not have a storage class");
6126         }
6127
6128         type_t *result = parse_abstract_declarator(specifiers.type);
6129
6130         return result;
6131 }
6132
6133
6134
6135
6136 typedef expression_t* (*parse_expression_function)(void);
6137 typedef expression_t* (*parse_expression_infix_function)(expression_t *left);
6138
6139 typedef struct expression_parser_function_t expression_parser_function_t;
6140 struct expression_parser_function_t {
6141         parse_expression_function        parser;
6142         precedence_t                     infix_precedence;
6143         parse_expression_infix_function  infix_parser;
6144 };
6145
6146 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
6147
6148 /**
6149  * Prints an error message if an expression was expected but not read
6150  */
6151 static expression_t *expected_expression_error(void)
6152 {
6153         /* skip the error message if the error token was read */
6154         if (token.type != T_ERROR) {
6155                 errorf(HERE, "expected expression, got token %K", &token);
6156         }
6157         next_token();
6158
6159         return create_invalid_expression();
6160 }
6161
6162 /**
6163  * Parse a string constant.
6164  */
6165 static expression_t *parse_string_const(void)
6166 {
6167         wide_string_t wres;
6168         if (token.type == T_STRING_LITERAL) {
6169                 string_t res = token.v.string;
6170                 next_token();
6171                 while (token.type == T_STRING_LITERAL) {
6172                         res = concat_strings(&res, &token.v.string);
6173                         next_token();
6174                 }
6175                 if (token.type != T_WIDE_STRING_LITERAL) {
6176                         expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
6177                         /* note: that we use type_char_ptr here, which is already the
6178                          * automatic converted type. revert_automatic_type_conversion
6179                          * will construct the array type */
6180                         cnst->base.type    = warning.write_strings ? type_const_char_ptr : type_char_ptr;
6181                         cnst->string.value = res;
6182                         return cnst;
6183                 }
6184
6185                 wres = concat_string_wide_string(&res, &token.v.wide_string);
6186         } else {
6187                 wres = token.v.wide_string;
6188         }
6189         next_token();
6190
6191         for (;;) {
6192                 switch (token.type) {
6193                         case T_WIDE_STRING_LITERAL:
6194                                 wres = concat_wide_strings(&wres, &token.v.wide_string);
6195                                 break;
6196
6197                         case T_STRING_LITERAL:
6198                                 wres = concat_wide_string_string(&wres, &token.v.string);
6199                                 break;
6200
6201                         default: {
6202                                 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
6203                                 cnst->base.type         = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
6204                                 cnst->wide_string.value = wres;
6205                                 return cnst;
6206                         }
6207                 }
6208                 next_token();
6209         }
6210 }
6211
6212 /**
6213  * Parse a boolean constant.
6214  */
6215 static expression_t *parse_bool_const(bool value)
6216 {
6217         expression_t *cnst       = allocate_expression_zero(EXPR_CONST);
6218         cnst->base.type          = type_bool;
6219         cnst->conste.v.int_value = value;
6220
6221         next_token();
6222
6223         return cnst;
6224 }
6225
6226 /**
6227  * Parse an integer constant.
6228  */
6229 static expression_t *parse_int_const(void)
6230 {
6231         expression_t *cnst       = allocate_expression_zero(EXPR_CONST);
6232         cnst->base.type          = token.datatype;
6233         cnst->conste.v.int_value = token.v.intvalue;
6234
6235         next_token();
6236
6237         return cnst;
6238 }
6239
6240 /**
6241  * Parse a character constant.
6242  */
6243 static expression_t *parse_character_constant(void)
6244 {
6245         expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
6246         cnst->base.type          = token.datatype;
6247         cnst->conste.v.character = token.v.string;
6248
6249         if (cnst->conste.v.character.size != 1) {
6250                 if (!GNU_MODE) {
6251                         errorf(HERE, "more than 1 character in character constant");
6252                 } else if (warning.multichar) {
6253                         warningf(HERE, "multi-character character constant");
6254                 }
6255         }
6256         next_token();
6257
6258         return cnst;
6259 }
6260
6261 /**
6262  * Parse a wide character constant.
6263  */
6264 static expression_t *parse_wide_character_constant(void)
6265 {
6266         expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
6267         cnst->base.type               = token.datatype;
6268         cnst->conste.v.wide_character = token.v.wide_string;
6269
6270         if (cnst->conste.v.wide_character.size != 1) {
6271                 if (!GNU_MODE) {
6272                         errorf(HERE, "more than 1 character in character constant");
6273                 } else if (warning.multichar) {
6274                         warningf(HERE, "multi-character character constant");
6275                 }
6276         }
6277         next_token();
6278
6279         return cnst;
6280 }
6281
6282 /**
6283  * Parse a float constant.
6284  */
6285 static expression_t *parse_float_const(void)
6286 {
6287         expression_t *cnst         = allocate_expression_zero(EXPR_CONST);
6288         cnst->base.type            = token.datatype;
6289         cnst->conste.v.float_value = token.v.floatvalue;
6290
6291         next_token();
6292
6293         return cnst;
6294 }
6295
6296 static entity_t *create_implicit_function(symbol_t *symbol,
6297                 const source_position_t *source_position)
6298 {
6299         type_t *ntype                          = allocate_type_zero(TYPE_FUNCTION);
6300         ntype->function.return_type            = type_int;
6301         ntype->function.unspecified_parameters = true;
6302         ntype->function.linkage                = LINKAGE_C;
6303         type_t *type                           = identify_new_type(ntype);
6304
6305         entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION);
6306         entity->declaration.storage_class          = STORAGE_CLASS_EXTERN;
6307         entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
6308         entity->declaration.type                   = type;
6309         entity->declaration.implicit               = true;
6310         entity->base.symbol                        = symbol;
6311         entity->base.source_position               = *source_position;
6312
6313         if (current_scope != NULL) {
6314                 bool strict_prototypes_old = warning.strict_prototypes;
6315                 warning.strict_prototypes  = false;
6316                 record_entity(entity, false);
6317                 warning.strict_prototypes = strict_prototypes_old;
6318         }
6319
6320         return entity;
6321 }
6322
6323 /**
6324  * Creates a return_type (func)(argument_type) function type if not
6325  * already exists.
6326  */
6327 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
6328                                     type_t *argument_type2)
6329 {
6330         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
6331         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
6332         parameter1->next = parameter2;
6333
6334         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
6335         type->function.return_type = return_type;
6336         type->function.parameters  = parameter1;
6337
6338         return identify_new_type(type);
6339 }
6340
6341 /**
6342  * Creates a return_type (func)(argument_type) function type if not
6343  * already exists.
6344  *
6345  * @param return_type    the return type
6346  * @param argument_type  the argument type
6347  */
6348 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
6349 {
6350         function_parameter_t *const parameter = allocate_parameter(argument_type);
6351
6352         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
6353         type->function.return_type = return_type;
6354         type->function.parameters  = parameter;
6355
6356         return identify_new_type(type);
6357 }
6358
6359 /**
6360  * Creates a return_type (func)(argument_type, ...) function type if not
6361  * already exists.
6362  *
6363  * @param return_type    the return type
6364  * @param argument_type  the argument type
6365  */
6366 static type_t *make_function_1_type_variadic(type_t *return_type, type_t *argument_type)
6367 {
6368         function_parameter_t *const parameter = allocate_parameter(argument_type);
6369
6370         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
6371         type->function.return_type = return_type;
6372         type->function.parameters  = parameter;
6373         type->function.variadic    = true;
6374
6375         return identify_new_type(type);
6376 }
6377
6378 /**
6379  * Creates a return_type (func)(void) function type if not
6380  * already exists.
6381  *
6382  * @param return_type    the return type
6383  */
6384 static type_t *make_function_0_type(type_t *return_type)
6385 {
6386         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
6387         type->function.return_type = return_type;
6388         type->function.parameters  = NULL;
6389
6390         return identify_new_type(type);
6391 }
6392
6393 /**
6394  * Creates a NO_RETURN return_type (func)(void) function type if not
6395  * already exists.
6396  *
6397  * @param return_type    the return type
6398  */
6399 static type_t *make_function_0_type_noreturn(type_t *return_type)
6400 {
6401         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
6402         type->function.return_type = return_type;
6403         type->function.parameters  = NULL;
6404         type->function.modifiers  |= DM_NORETURN;
6405         return identify_new_type(type);
6406 }
6407
6408 /**
6409  * Performs automatic type cast as described in §6.3.2.1.
6410  *
6411  * @param orig_type  the original type
6412  */
6413 static type_t *automatic_type_conversion(type_t *orig_type)
6414 {
6415         type_t *type = skip_typeref(orig_type);
6416         if (is_type_array(type)) {
6417                 array_type_t *array_type   = &type->array;
6418                 type_t       *element_type = array_type->element_type;
6419                 unsigned      qualifiers   = array_type->base.qualifiers;
6420
6421                 return make_pointer_type(element_type, qualifiers);
6422         }
6423
6424         if (is_type_function(type)) {
6425                 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6426         }
6427
6428         return orig_type;
6429 }
6430
6431 /**
6432  * reverts the automatic casts of array to pointer types and function
6433  * to function-pointer types as defined §6.3.2.1
6434  */
6435 type_t *revert_automatic_type_conversion(const expression_t *expression)
6436 {
6437         switch (expression->kind) {
6438                 case EXPR_REFERENCE: {
6439                         entity_t *entity = expression->reference.entity;
6440                         if (is_declaration(entity)) {
6441                                 return entity->declaration.type;
6442                         } else if (entity->kind == ENTITY_ENUM_VALUE) {
6443                                 return entity->enum_value.enum_type;
6444                         } else {
6445                                 panic("no declaration or enum in reference");
6446                         }
6447                 }
6448
6449                 case EXPR_SELECT: {
6450                         entity_t *entity = expression->select.compound_entry;
6451                         assert(is_declaration(entity));
6452                         type_t   *type   = entity->declaration.type;
6453                         return get_qualified_type(type,
6454                                         expression->base.type->base.qualifiers);
6455                 }
6456
6457                 case EXPR_UNARY_DEREFERENCE: {
6458                         const expression_t *const value = expression->unary.value;
6459                         type_t             *const type  = skip_typeref(value->base.type);
6460                         if (!is_type_pointer(type))
6461                                 return type_error_type;
6462                         return type->pointer.points_to;
6463                 }
6464
6465                 case EXPR_ARRAY_ACCESS: {
6466                         const expression_t *array_ref = expression->array_access.array_ref;
6467                         type_t             *type_left = skip_typeref(array_ref->base.type);
6468                         if (!is_type_pointer(type_left))
6469                                 return type_error_type;
6470                         return type_left->pointer.points_to;
6471                 }
6472
6473                 case EXPR_STRING_LITERAL: {
6474                         size_t size = expression->string.value.size;
6475                         return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6476                 }
6477
6478                 case EXPR_WIDE_STRING_LITERAL: {
6479                         size_t size = expression->wide_string.value.size;
6480                         return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6481                 }
6482
6483                 case EXPR_COMPOUND_LITERAL:
6484                         return expression->compound_literal.type;
6485
6486                 default:
6487                         return expression->base.type;
6488         }
6489 }
6490
6491 /**
6492  * Find an entity matching a symbol in a scope.
6493  * Uses current scope if scope is NULL
6494  */
6495 static entity_t *lookup_entity(const scope_t *scope, symbol_t *symbol,
6496                                namespace_tag_t namespc)
6497 {
6498         if (scope == NULL) {
6499                 return get_entity(symbol, namespc);
6500         }
6501
6502         /* we should optimize here, if scope grows above a certain size we should
6503            construct a hashmap here... */
6504         entity_t *entity = scope->entities;
6505         for ( ; entity != NULL; entity = entity->base.next) {
6506                 if (entity->base.symbol == symbol && entity->base.namespc == namespc)
6507                         break;
6508         }
6509
6510         return entity;
6511 }
6512
6513 static entity_t *parse_qualified_identifier(void)
6514 {
6515         /* namespace containing the symbol */
6516         symbol_t          *symbol;
6517         source_position_t  pos;
6518         const scope_t     *lookup_scope = NULL;
6519
6520         if (token.type == T_COLONCOLON) {
6521                 next_token();
6522                 lookup_scope = &unit->scope;
6523         }
6524
6525         entity_t *entity;
6526         while (true) {
6527                 if (token.type != T_IDENTIFIER) {
6528                         parse_error_expected("while parsing identifier", T_IDENTIFIER, NULL);
6529                         return create_error_entity(sym_anonymous, ENTITY_VARIABLE);
6530                 }
6531                 symbol = token.v.symbol;
6532                 pos    = *HERE;
6533                 next_token();
6534
6535                 /* lookup entity */
6536                 entity = lookup_entity(lookup_scope, symbol, NAMESPACE_NORMAL);
6537
6538                 if (token.type != T_COLONCOLON)
6539                         break;
6540                 next_token();
6541
6542                 switch (entity->kind) {
6543                 case ENTITY_NAMESPACE:
6544                         lookup_scope = &entity->namespacee.members;
6545                         break;
6546                 case ENTITY_STRUCT:
6547                 case ENTITY_UNION:
6548                 case ENTITY_CLASS:
6549                         lookup_scope = &entity->compound.members;
6550                         break;
6551                 default:
6552                         errorf(&pos, "'%Y' must be a namespace, class, struct or union (but is a %s)",
6553                                symbol, get_entity_kind_name(entity->kind));
6554                         goto end_error;
6555                 }
6556         }
6557
6558         if (entity == NULL) {
6559                 if (!strict_mode && token.type == '(') {
6560                         /* an implicitly declared function */
6561                         if (warning.error_implicit_function_declaration) {
6562                                 errorf(&pos, "implicit declaration of function '%Y'", symbol);
6563                         } else if (warning.implicit_function_declaration) {
6564                                 warningf(&pos, "implicit declaration of function '%Y'", symbol);
6565                         }
6566
6567                         entity = create_implicit_function(symbol, &pos);
6568                 } else {
6569                         errorf(&pos, "unknown identifier '%Y' found.", symbol);
6570                         entity = create_error_entity(symbol, ENTITY_VARIABLE);
6571                 }
6572         }
6573
6574         return entity;
6575
6576 end_error:
6577         /* skip further qualifications */
6578         while (token.type == T_IDENTIFIER) {
6579                 next_token();
6580                 if (token.type != T_COLONCOLON)
6581                         break;
6582                 next_token();
6583         }
6584
6585         return create_error_entity(sym_anonymous, ENTITY_VARIABLE);
6586 }
6587
6588 static expression_t *parse_reference(void)
6589 {
6590         entity_t *entity = parse_qualified_identifier();
6591
6592         type_t *orig_type;
6593         if (is_declaration(entity)) {
6594                 orig_type = entity->declaration.type;
6595         } else if (entity->kind == ENTITY_ENUM_VALUE) {
6596                 orig_type = entity->enum_value.enum_type;
6597         } else {
6598                 panic("expected declaration or enum value in reference");
6599         }
6600
6601         /* we always do the auto-type conversions; the & and sizeof parser contains
6602          * code to revert this! */
6603         type_t *type = automatic_type_conversion(orig_type);
6604
6605         expression_kind_t kind = EXPR_REFERENCE;
6606         if (entity->kind == ENTITY_ENUM_VALUE)
6607                 kind = EXPR_REFERENCE_ENUM_VALUE;
6608
6609         expression_t *expression     = allocate_expression_zero(kind);
6610         expression->reference.entity = entity;
6611         expression->base.type        = type;
6612
6613         /* this declaration is used */
6614         if (is_declaration(entity)) {
6615                 entity->declaration.used = true;
6616         }
6617
6618         if (entity->base.parent_scope != file_scope
6619                 && (current_function != NULL
6620                         && entity->base.parent_scope->depth < current_function->parameters.depth)
6621                 && (entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER)) {
6622                 if (entity->kind == ENTITY_VARIABLE) {
6623                         /* access of a variable from an outer function */
6624                         entity->variable.address_taken = true;
6625                 } else if (entity->kind == ENTITY_PARAMETER) {
6626                         entity->parameter.address_taken = true;
6627                 }
6628                 current_function->need_closure = true;
6629         }
6630
6631         check_deprecated(HERE, entity);
6632
6633         if (warning.init_self && entity == current_init_decl && !in_type_prop
6634             && entity->kind == ENTITY_VARIABLE) {
6635                 current_init_decl = NULL;
6636                 warningf(HERE, "variable '%#T' is initialized by itself",
6637                          entity->declaration.type, entity->base.symbol);
6638         }
6639
6640         return expression;
6641 }
6642
6643 static bool semantic_cast(expression_t *cast)
6644 {
6645         expression_t            *expression      = cast->unary.value;
6646         type_t                  *orig_dest_type  = cast->base.type;
6647         type_t                  *orig_type_right = expression->base.type;
6648         type_t            const *dst_type        = skip_typeref(orig_dest_type);
6649         type_t            const *src_type        = skip_typeref(orig_type_right);
6650         source_position_t const *pos             = &cast->base.source_position;
6651
6652         /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
6653         if (dst_type == type_void)
6654                 return true;
6655
6656         /* only integer and pointer can be casted to pointer */
6657         if (is_type_pointer(dst_type)  &&
6658             !is_type_pointer(src_type) &&
6659             !is_type_integer(src_type) &&
6660             is_type_valid(src_type)) {
6661                 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
6662                 return false;
6663         }
6664
6665         if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
6666                 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
6667                 return false;
6668         }
6669
6670         if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
6671                 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
6672                 return false;
6673         }
6674
6675         if (warning.cast_qual &&
6676             is_type_pointer(src_type) &&
6677             is_type_pointer(dst_type)) {
6678                 type_t *src = skip_typeref(src_type->pointer.points_to);
6679                 type_t *dst = skip_typeref(dst_type->pointer.points_to);
6680                 unsigned missing_qualifiers =
6681                         src->base.qualifiers & ~dst->base.qualifiers;
6682                 if (missing_qualifiers != 0) {
6683                         warningf(pos,
6684                                  "cast discards qualifiers '%Q' in pointer target type of '%T'",
6685                                  missing_qualifiers, orig_type_right);
6686                 }
6687         }
6688         return true;
6689 }
6690
6691 static expression_t *parse_compound_literal(type_t *type)
6692 {
6693         expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
6694
6695         parse_initializer_env_t env;
6696         env.type             = type;
6697         env.entity           = NULL;
6698         env.must_be_constant = false;
6699         initializer_t *initializer = parse_initializer(&env);
6700         type = env.type;
6701
6702         expression->compound_literal.initializer = initializer;
6703         expression->compound_literal.type        = type;
6704         expression->base.type                    = automatic_type_conversion(type);
6705
6706         return expression;
6707 }
6708
6709 /**
6710  * Parse a cast expression.
6711  */
6712 static expression_t *parse_cast(void)
6713 {
6714         add_anchor_token(')');
6715
6716         source_position_t source_position = token.source_position;
6717
6718         type_t *type = parse_typename();
6719
6720         rem_anchor_token(')');
6721         expect(')', end_error);
6722
6723         if (token.type == '{') {
6724                 return parse_compound_literal(type);
6725         }
6726
6727         expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
6728         cast->base.source_position = source_position;
6729
6730         expression_t *value = parse_sub_expression(PREC_CAST);
6731         cast->base.type   = type;
6732         cast->unary.value = value;
6733
6734         if (! semantic_cast(cast)) {
6735                 /* TODO: record the error in the AST. else it is impossible to detect it */
6736         }
6737
6738         return cast;
6739 end_error:
6740         return create_invalid_expression();
6741 }
6742
6743 /**
6744  * Parse a statement expression.
6745  */
6746 static expression_t *parse_statement_expression(void)
6747 {
6748         add_anchor_token(')');
6749
6750         expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
6751
6752         statement_t *statement          = parse_compound_statement(true);
6753         statement->compound.stmt_expr   = true;
6754         expression->statement.statement = statement;
6755
6756         /* find last statement and use its type */
6757         type_t *type = type_void;
6758         const statement_t *stmt = statement->compound.statements;
6759         if (stmt != NULL) {
6760                 while (stmt->base.next != NULL)
6761                         stmt = stmt->base.next;
6762
6763                 if (stmt->kind == STATEMENT_EXPRESSION) {
6764                         type = stmt->expression.expression->base.type;
6765                 }
6766         } else if (warning.other) {
6767                 warningf(&expression->base.source_position, "empty statement expression ({})");
6768         }
6769         expression->base.type = type;
6770
6771         rem_anchor_token(')');
6772         expect(')', end_error);
6773
6774 end_error:
6775         return expression;
6776 }
6777
6778 /**
6779  * Parse a parenthesized expression.
6780  */
6781 static expression_t *parse_parenthesized_expression(void)
6782 {
6783         eat('(');
6784
6785         switch (token.type) {
6786         case '{':
6787                 /* gcc extension: a statement expression */
6788                 return parse_statement_expression();
6789
6790         TYPE_QUALIFIERS
6791         TYPE_SPECIFIERS
6792                 return parse_cast();
6793         case T_IDENTIFIER:
6794                 if (is_typedef_symbol(token.v.symbol)) {
6795                         return parse_cast();
6796                 }
6797         }
6798
6799         add_anchor_token(')');
6800         expression_t *result = parse_expression();
6801         result->base.parenthesized = true;
6802         rem_anchor_token(')');
6803         expect(')', end_error);
6804
6805 end_error:
6806         return result;
6807 }
6808
6809 static expression_t *parse_function_keyword(void)
6810 {
6811         /* TODO */
6812
6813         if (current_function == NULL) {
6814                 errorf(HERE, "'__func__' used outside of a function");
6815         }
6816
6817         expression_t *expression  = allocate_expression_zero(EXPR_FUNCNAME);
6818         expression->base.type     = type_char_ptr;
6819         expression->funcname.kind = FUNCNAME_FUNCTION;
6820
6821         next_token();
6822
6823         return expression;
6824 }
6825
6826 static expression_t *parse_pretty_function_keyword(void)
6827 {
6828         if (current_function == NULL) {
6829                 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
6830         }
6831
6832         expression_t *expression  = allocate_expression_zero(EXPR_FUNCNAME);
6833         expression->base.type     = type_char_ptr;
6834         expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
6835
6836         eat(T___PRETTY_FUNCTION__);
6837
6838         return expression;
6839 }
6840
6841 static expression_t *parse_funcsig_keyword(void)
6842 {
6843         if (current_function == NULL) {
6844                 errorf(HERE, "'__FUNCSIG__' used outside of a function");
6845         }
6846
6847         expression_t *expression  = allocate_expression_zero(EXPR_FUNCNAME);
6848         expression->base.type     = type_char_ptr;
6849         expression->funcname.kind = FUNCNAME_FUNCSIG;
6850
6851         eat(T___FUNCSIG__);
6852
6853         return expression;
6854 }
6855
6856 static expression_t *parse_funcdname_keyword(void)
6857 {
6858         if (current_function == NULL) {
6859                 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
6860         }
6861
6862         expression_t *expression  = allocate_expression_zero(EXPR_FUNCNAME);
6863         expression->base.type     = type_char_ptr;
6864         expression->funcname.kind = FUNCNAME_FUNCDNAME;
6865
6866         eat(T___FUNCDNAME__);
6867
6868         return expression;
6869 }
6870
6871 static designator_t *parse_designator(void)
6872 {
6873         designator_t *result    = allocate_ast_zero(sizeof(result[0]));
6874         result->source_position = *HERE;
6875
6876         if (token.type != T_IDENTIFIER) {
6877                 parse_error_expected("while parsing member designator",
6878                                      T_IDENTIFIER, NULL);
6879                 return NULL;
6880         }
6881         result->symbol = token.v.symbol;
6882         next_token();
6883
6884         designator_t *last_designator = result;
6885         while (true) {
6886                 if (token.type == '.') {
6887                         next_token();
6888                         if (token.type != T_IDENTIFIER) {
6889                                 parse_error_expected("while parsing member designator",
6890                                                      T_IDENTIFIER, NULL);
6891                                 return NULL;
6892                         }
6893                         designator_t *designator    = allocate_ast_zero(sizeof(result[0]));
6894                         designator->source_position = *HERE;
6895                         designator->symbol          = token.v.symbol;
6896                         next_token();
6897
6898                         last_designator->next = designator;
6899                         last_designator       = designator;
6900                         continue;
6901                 }
6902                 if (token.type == '[') {
6903                         next_token();
6904                         add_anchor_token(']');
6905                         designator_t *designator    = allocate_ast_zero(sizeof(result[0]));
6906                         designator->source_position = *HERE;
6907                         designator->array_index     = parse_expression();
6908                         rem_anchor_token(']');
6909                         expect(']', end_error);
6910                         if (designator->array_index == NULL) {
6911                                 return NULL;
6912                         }
6913
6914                         last_designator->next = designator;
6915                         last_designator       = designator;
6916                         continue;
6917                 }
6918                 break;
6919         }
6920
6921         return result;
6922 end_error:
6923         return NULL;
6924 }
6925
6926 /**
6927  * Parse the __builtin_offsetof() expression.
6928  */
6929 static expression_t *parse_offsetof(void)
6930 {
6931         expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
6932         expression->base.type    = type_size_t;
6933
6934         eat(T___builtin_offsetof);
6935
6936         expect('(', end_error);
6937         add_anchor_token(',');
6938         type_t *type = parse_typename();
6939         rem_anchor_token(',');
6940         expect(',', end_error);
6941         add_anchor_token(')');
6942         designator_t *designator = parse_designator();
6943         rem_anchor_token(')');
6944         expect(')', end_error);
6945
6946         expression->offsetofe.type       = type;
6947         expression->offsetofe.designator = designator;
6948
6949         type_path_t path;
6950         memset(&path, 0, sizeof(path));
6951         path.top_type = type;
6952         path.path     = NEW_ARR_F(type_path_entry_t, 0);
6953
6954         descend_into_subtype(&path);
6955
6956         if (!walk_designator(&path, designator, true)) {
6957                 return create_invalid_expression();
6958         }
6959
6960         DEL_ARR_F(path.path);
6961
6962         return expression;
6963 end_error:
6964         return create_invalid_expression();
6965 }
6966
6967 /**
6968  * Parses a _builtin_va_start() expression.
6969  */
6970 static expression_t *parse_va_start(void)
6971 {
6972         expression_t *expression = allocate_expression_zero(EXPR_VA_START);
6973
6974         eat(T___builtin_va_start);
6975
6976         expect('(', end_error);
6977         add_anchor_token(',');
6978         expression->va_starte.ap = parse_assignment_expression();
6979         rem_anchor_token(',');
6980         expect(',', end_error);
6981         expression_t *const expr = parse_assignment_expression();
6982         if (expr->kind == EXPR_REFERENCE) {
6983                 entity_t *const entity = expr->reference.entity;
6984                 if (!current_function->base.type->function.variadic) {
6985                         errorf(&expr->base.source_position,
6986                                         "'va_start' used in non-variadic function");
6987                 } else if (entity->base.parent_scope != &current_function->parameters ||
6988                                 entity->base.next != NULL ||
6989                                 entity->kind != ENTITY_PARAMETER) {
6990                         errorf(&expr->base.source_position,
6991                                "second argument of 'va_start' must be last parameter of the current function");
6992                 } else {
6993                         expression->va_starte.parameter = &entity->variable;
6994                 }
6995                 expect(')', end_error);
6996                 return expression;
6997         }
6998         expect(')', end_error);
6999 end_error:
7000         return create_invalid_expression();
7001 }
7002
7003 /**
7004  * Parses a __builtin_va_arg() expression.
7005  */
7006 static expression_t *parse_va_arg(void)
7007 {
7008         expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
7009
7010         eat(T___builtin_va_arg);
7011
7012         expect('(', end_error);
7013         call_argument_t ap;
7014         ap.expression = parse_assignment_expression();
7015         expression->va_arge.ap = ap.expression;
7016         check_call_argument(type_valist, &ap, 1);
7017
7018         expect(',', end_error);
7019         expression->base.type = parse_typename();
7020         expect(')', end_error);
7021
7022         return expression;
7023 end_error:
7024         return create_invalid_expression();
7025 }
7026
7027 /**
7028  * Parses a __builtin_va_copy() expression.
7029  */
7030 static expression_t *parse_va_copy(void)
7031 {
7032         expression_t *expression = allocate_expression_zero(EXPR_VA_COPY);
7033
7034         eat(T___builtin_va_copy);
7035
7036         expect('(', end_error);
7037         expression_t *dst = parse_assignment_expression();
7038         assign_error_t error = semantic_assign(type_valist, dst);
7039         report_assign_error(error, type_valist, dst, "call argument 1",
7040                             &dst->base.source_position);
7041         expression->va_copye.dst = dst;
7042
7043         expect(',', end_error);
7044
7045         call_argument_t src;
7046         src.expression = parse_assignment_expression();
7047         check_call_argument(type_valist, &src, 2);
7048         expression->va_copye.src = src.expression;
7049         expect(')', end_error);
7050
7051         return expression;
7052 end_error:
7053         return create_invalid_expression();
7054 }
7055
7056 /**
7057  * Parses a __builtin_constant_p() expression.
7058  */
7059 static expression_t *parse_builtin_constant(void)
7060 {
7061         expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
7062
7063         eat(T___builtin_constant_p);
7064
7065         expect('(', end_error);
7066         add_anchor_token(')');
7067         expression->builtin_constant.value = parse_assignment_expression();
7068         rem_anchor_token(')');
7069         expect(')', end_error);
7070         expression->base.type = type_int;
7071
7072         return expression;
7073 end_error:
7074         return create_invalid_expression();
7075 }
7076
7077 /**
7078  * Parses a __builtin_types_compatible_p() expression.
7079  */
7080 static expression_t *parse_builtin_types_compatible(void)
7081 {
7082         expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_TYPES_COMPATIBLE_P);
7083
7084         eat(T___builtin_types_compatible_p);
7085
7086         expect('(', end_error);
7087         add_anchor_token(')');
7088         add_anchor_token(',');
7089         expression->builtin_types_compatible.left = parse_typename();
7090         rem_anchor_token(',');
7091         expect(',', end_error);
7092         expression->builtin_types_compatible.right = parse_typename();
7093         rem_anchor_token(')');
7094         expect(')', end_error);
7095         expression->base.type = type_int;
7096
7097         return expression;
7098 end_error:
7099         return create_invalid_expression();
7100 }
7101
7102 /**
7103  * Parses a __builtin_is_*() compare expression.
7104  */
7105 static expression_t *parse_compare_builtin(void)
7106 {
7107         expression_t *expression;
7108
7109         switch (token.type) {
7110         case T___builtin_isgreater:
7111                 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
7112                 break;
7113         case T___builtin_isgreaterequal:
7114                 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
7115                 break;
7116         case T___builtin_isless:
7117                 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
7118                 break;
7119         case T___builtin_islessequal:
7120                 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
7121                 break;
7122         case T___builtin_islessgreater:
7123                 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
7124                 break;
7125         case T___builtin_isunordered:
7126                 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
7127                 break;
7128         default:
7129                 internal_errorf(HERE, "invalid compare builtin found");
7130         }
7131         expression->base.source_position = *HERE;
7132         next_token();
7133
7134         expect('(', end_error);
7135         expression->binary.left = parse_assignment_expression();
7136         expect(',', end_error);
7137         expression->binary.right = parse_assignment_expression();
7138         expect(')', end_error);
7139
7140         type_t *const orig_type_left  = expression->binary.left->base.type;
7141         type_t *const orig_type_right = expression->binary.right->base.type;
7142
7143         type_t *const type_left  = skip_typeref(orig_type_left);
7144         type_t *const type_right = skip_typeref(orig_type_right);
7145         if (!is_type_float(type_left) && !is_type_float(type_right)) {
7146                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7147                         type_error_incompatible("invalid operands in comparison",
7148                                 &expression->base.source_position, orig_type_left, orig_type_right);
7149                 }
7150         } else {
7151                 semantic_comparison(&expression->binary);
7152         }
7153
7154         return expression;
7155 end_error:
7156         return create_invalid_expression();
7157 }
7158
7159 /**
7160  * Parses a MS assume() expression.
7161  */
7162 static expression_t *parse_assume(void)
7163 {
7164         expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME);
7165
7166         eat(T__assume);
7167
7168         expect('(', end_error);
7169         add_anchor_token(')');
7170         expression->unary.value = parse_assignment_expression();
7171         rem_anchor_token(')');
7172         expect(')', end_error);
7173
7174         expression->base.type = type_void;
7175         return expression;
7176 end_error:
7177         return create_invalid_expression();
7178 }
7179
7180 /**
7181  * Return the declaration for a given label symbol or create a new one.
7182  *
7183  * @param symbol  the symbol of the label
7184  */
7185 static label_t *get_label(symbol_t *symbol)
7186 {
7187         entity_t *label;
7188         assert(current_function != NULL);
7189
7190         label = get_entity(symbol, NAMESPACE_LABEL);
7191         /* if we found a local label, we already created the declaration */
7192         if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) {
7193                 if (label->base.parent_scope != current_scope) {
7194                         assert(label->base.parent_scope->depth < current_scope->depth);
7195                         current_function->goto_to_outer = true;
7196                 }
7197                 return &label->label;
7198         }
7199
7200         label = get_entity(symbol, NAMESPACE_LABEL);
7201         /* if we found a label in the same function, then we already created the
7202          * declaration */
7203         if (label != NULL
7204                         && label->base.parent_scope == &current_function->parameters) {
7205                 return &label->label;
7206         }
7207
7208         /* otherwise we need to create a new one */
7209         label               = allocate_entity_zero(ENTITY_LABEL);
7210         label->base.namespc = NAMESPACE_LABEL;
7211         label->base.symbol  = symbol;
7212
7213         label_push(label);
7214
7215         return &label->label;
7216 }
7217
7218 /**
7219  * Parses a GNU && label address expression.
7220  */
7221 static expression_t *parse_label_address(void)
7222 {
7223         source_position_t source_position = token.source_position;
7224         eat(T_ANDAND);
7225         if (token.type != T_IDENTIFIER) {
7226                 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
7227                 goto end_error;
7228         }
7229         symbol_t *symbol = token.v.symbol;
7230         next_token();
7231
7232         label_t *label       = get_label(symbol);
7233         label->used          = true;
7234         label->address_taken = true;
7235
7236         expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
7237         expression->base.source_position = source_position;
7238
7239         /* label address is threaten as a void pointer */
7240         expression->base.type           = type_void_ptr;
7241         expression->label_address.label = label;
7242         return expression;
7243 end_error:
7244         return create_invalid_expression();
7245 }
7246
7247 /**
7248  * Parse a microsoft __noop expression.
7249  */
7250 static expression_t *parse_noop_expression(void)
7251 {
7252         /* the result is a (int)0 */
7253         expression_t *cnst         = allocate_expression_zero(EXPR_CONST);
7254         cnst->base.type            = type_int;
7255         cnst->conste.v.int_value   = 0;
7256         cnst->conste.is_ms_noop    = true;
7257
7258         eat(T___noop);
7259
7260         if (token.type == '(') {
7261                 /* parse arguments */
7262                 eat('(');
7263                 add_anchor_token(')');
7264                 add_anchor_token(',');
7265
7266                 if (token.type != ')') {
7267                         while (true) {
7268                                 (void)parse_assignment_expression();
7269                                 if (token.type != ',')
7270                                         break;
7271                                 next_token();
7272                         }
7273                 }
7274         }
7275         rem_anchor_token(',');
7276         rem_anchor_token(')');
7277         expect(')', end_error);
7278
7279 end_error:
7280         return cnst;
7281 }
7282
7283 /**
7284  * Parses a primary expression.
7285  */
7286 static expression_t *parse_primary_expression(void)
7287 {
7288         switch (token.type) {
7289                 case T_false:                        return parse_bool_const(false);
7290                 case T_true:                         return parse_bool_const(true);
7291                 case T_INTEGER:                      return parse_int_const();
7292                 case T_CHARACTER_CONSTANT:           return parse_character_constant();
7293                 case T_WIDE_CHARACTER_CONSTANT:      return parse_wide_character_constant();
7294                 case T_FLOATINGPOINT:                return parse_float_const();
7295                 case T_STRING_LITERAL:
7296                 case T_WIDE_STRING_LITERAL:          return parse_string_const();
7297                 case T___FUNCTION__:
7298                 case T___func__:                     return parse_function_keyword();
7299                 case T___PRETTY_FUNCTION__:          return parse_pretty_function_keyword();
7300                 case T___FUNCSIG__:                  return parse_funcsig_keyword();
7301                 case T___FUNCDNAME__:                return parse_funcdname_keyword();
7302                 case T___builtin_offsetof:           return parse_offsetof();
7303                 case T___builtin_va_start:           return parse_va_start();
7304                 case T___builtin_va_arg:             return parse_va_arg();
7305                 case T___builtin_va_copy:            return parse_va_copy();
7306                 case T___builtin_isgreater:
7307                 case T___builtin_isgreaterequal:
7308                 case T___builtin_isless:
7309                 case T___builtin_islessequal:
7310                 case T___builtin_islessgreater:
7311                 case T___builtin_isunordered:        return parse_compare_builtin();
7312                 case T___builtin_constant_p:         return parse_builtin_constant();
7313                 case T___builtin_types_compatible_p: return parse_builtin_types_compatible();
7314                 case T__assume:                      return parse_assume();
7315                 case T_ANDAND:
7316                         if (GNU_MODE)
7317                                 return parse_label_address();
7318                         break;
7319
7320                 case '(':                            return parse_parenthesized_expression();
7321                 case T___noop:                       return parse_noop_expression();
7322
7323                 /* Gracefully handle type names while parsing expressions. */
7324                 case T_COLONCOLON:
7325                         return parse_reference();
7326                 case T_IDENTIFIER:
7327                         if (!is_typedef_symbol(token.v.symbol)) {
7328                                 return parse_reference();
7329                         }
7330                         /* FALLTHROUGH */
7331                 TYPENAME_START {
7332                         source_position_t  const pos  = *HERE;
7333                         type_t const      *const type = parse_typename();
7334                         errorf(&pos, "encountered type '%T' while parsing expression", type);
7335                         return create_invalid_expression();
7336                 }
7337         }
7338
7339         errorf(HERE, "unexpected token %K, expected an expression", &token);
7340         return create_invalid_expression();
7341 }
7342
7343 /**
7344  * Check if the expression has the character type and issue a warning then.
7345  */
7346 static void check_for_char_index_type(const expression_t *expression)
7347 {
7348         type_t       *const type      = expression->base.type;
7349         const type_t *const base_type = skip_typeref(type);
7350
7351         if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
7352                         warning.char_subscripts) {
7353                 warningf(&expression->base.source_position,
7354                          "array subscript has type '%T'", type);
7355         }
7356 }
7357
7358 static expression_t *parse_array_expression(expression_t *left)
7359 {
7360         expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
7361
7362         eat('[');
7363         add_anchor_token(']');
7364
7365         expression_t *inside = parse_expression();
7366
7367         type_t *const orig_type_left   = left->base.type;
7368         type_t *const orig_type_inside = inside->base.type;
7369
7370         type_t *const type_left   = skip_typeref(orig_type_left);
7371         type_t *const type_inside = skip_typeref(orig_type_inside);
7372
7373         type_t                    *return_type;
7374         array_access_expression_t *array_access = &expression->array_access;
7375         if (is_type_pointer(type_left)) {
7376                 return_type             = type_left->pointer.points_to;
7377                 array_access->array_ref = left;
7378                 array_access->index     = inside;
7379                 check_for_char_index_type(inside);
7380         } else if (is_type_pointer(type_inside)) {
7381                 return_type             = type_inside->pointer.points_to;
7382                 array_access->array_ref = inside;
7383                 array_access->index     = left;
7384                 array_access->flipped   = true;
7385                 check_for_char_index_type(left);
7386         } else {
7387                 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
7388                         errorf(HERE,
7389                                 "array access on object with non-pointer types '%T', '%T'",
7390                                 orig_type_left, orig_type_inside);
7391                 }
7392                 return_type             = type_error_type;
7393                 array_access->array_ref = left;
7394                 array_access->index     = inside;
7395         }
7396
7397         expression->base.type = automatic_type_conversion(return_type);
7398
7399         rem_anchor_token(']');
7400         expect(']', end_error);
7401 end_error:
7402         return expression;
7403 }
7404
7405 static expression_t *parse_typeprop(expression_kind_t const kind)
7406 {
7407         expression_t  *tp_expression = allocate_expression_zero(kind);
7408         tp_expression->base.type     = type_size_t;
7409
7410         eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__);
7411
7412         /* we only refer to a type property, mark this case */
7413         bool old     = in_type_prop;
7414         in_type_prop = true;
7415
7416         type_t       *orig_type;
7417         expression_t *expression;
7418         if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
7419                 next_token();
7420                 add_anchor_token(')');
7421                 orig_type = parse_typename();
7422                 rem_anchor_token(')');
7423                 expect(')', end_error);
7424
7425                 if (token.type == '{') {
7426                         /* It was not sizeof(type) after all.  It is sizeof of an expression
7427                          * starting with a compound literal */
7428                         expression = parse_compound_literal(orig_type);
7429                         goto typeprop_expression;
7430                 }
7431         } else {
7432                 expression = parse_sub_expression(PREC_UNARY);
7433
7434 typeprop_expression:
7435                 tp_expression->typeprop.tp_expression = expression;
7436
7437                 orig_type = revert_automatic_type_conversion(expression);
7438                 expression->base.type = orig_type;
7439         }
7440
7441         tp_expression->typeprop.type   = orig_type;
7442         type_t const* const type       = skip_typeref(orig_type);
7443         char   const* const wrong_type =
7444                 GNU_MODE && is_type_atomic(type, ATOMIC_TYPE_VOID) ? NULL                  :
7445                 is_type_incomplete(type)                           ? "incomplete"          :
7446                 type->kind == TYPE_FUNCTION                        ? "function designator" :
7447                 type->kind == TYPE_BITFIELD                        ? "bitfield"            :
7448                 NULL;
7449         if (wrong_type != NULL) {
7450                 char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
7451                 errorf(&tp_expression->base.source_position,
7452                                 "operand of %s expression must not be of %s type '%T'",
7453                                 what, wrong_type, orig_type);
7454         }
7455
7456 end_error:
7457         in_type_prop = old;
7458         return tp_expression;
7459 }
7460
7461 static expression_t *parse_sizeof(void)
7462 {
7463         return parse_typeprop(EXPR_SIZEOF);
7464 }
7465
7466 static expression_t *parse_alignof(void)
7467 {
7468         return parse_typeprop(EXPR_ALIGNOF);
7469 }
7470
7471 static expression_t *parse_select_expression(expression_t *addr)
7472 {
7473         assert(token.type == '.' || token.type == T_MINUSGREATER);
7474         bool select_left_arrow = (token.type == T_MINUSGREATER);
7475         next_token();
7476
7477         if (token.type != T_IDENTIFIER) {
7478                 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7479                 return create_invalid_expression();
7480         }
7481         symbol_t *symbol = token.v.symbol;
7482         next_token();
7483
7484         type_t *const orig_type = addr->base.type;
7485         type_t *const type      = skip_typeref(orig_type);
7486
7487         type_t *type_left;
7488         bool    saw_error = false;
7489         if (is_type_pointer(type)) {
7490                 if (!select_left_arrow) {
7491                         errorf(HERE,
7492                                "request for member '%Y' in something not a struct or union, but '%T'",
7493                                symbol, orig_type);
7494                         saw_error = true;
7495                 }
7496                 type_left = skip_typeref(type->pointer.points_to);
7497         } else {
7498                 if (select_left_arrow && is_type_valid(type)) {
7499                         errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7500                         saw_error = true;
7501                 }
7502                 type_left = type;
7503         }
7504
7505         if (type_left->kind != TYPE_COMPOUND_STRUCT &&
7506             type_left->kind != TYPE_COMPOUND_UNION) {
7507
7508                 if (is_type_valid(type_left) && !saw_error) {
7509                         errorf(HERE,
7510                                "request for member '%Y' in something not a struct or union, but '%T'",
7511                                symbol, type_left);
7512                 }
7513                 return create_invalid_expression();
7514         }
7515
7516         compound_t *compound = type_left->compound.compound;
7517         if (!compound->complete) {
7518                 errorf(HERE, "request for member '%Y' in incomplete type '%T'",
7519                        symbol, type_left);
7520                 return create_invalid_expression();
7521         }
7522
7523         type_qualifiers_t  qualifiers = type_left->base.qualifiers;
7524         expression_t      *result
7525                 = find_create_select(HERE, addr, qualifiers, compound, symbol);
7526
7527         if (result == NULL) {
7528                 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7529                 return create_invalid_expression();
7530         }
7531
7532         return result;
7533 }
7534
7535 static void check_call_argument(type_t          *expected_type,
7536                                 call_argument_t *argument, unsigned pos)
7537 {
7538         type_t         *expected_type_skip = skip_typeref(expected_type);
7539         assign_error_t  error              = ASSIGN_ERROR_INCOMPATIBLE;
7540         expression_t   *arg_expr           = argument->expression;
7541         type_t         *arg_type           = skip_typeref(arg_expr->base.type);
7542
7543         /* handle transparent union gnu extension */
7544         if (is_type_union(expected_type_skip)
7545                         && (get_type_modifiers(expected_type) & DM_TRANSPARENT_UNION)) {
7546                 compound_t *union_decl  = expected_type_skip->compound.compound;
7547                 type_t     *best_type   = NULL;
7548                 entity_t   *entry       = union_decl->members.entities;
7549                 for ( ; entry != NULL; entry = entry->base.next) {
7550                         assert(is_declaration(entry));
7551                         type_t *decl_type = entry->declaration.type;
7552                         error = semantic_assign(decl_type, arg_expr);
7553                         if (error == ASSIGN_ERROR_INCOMPATIBLE
7554                                 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7555                                 continue;
7556
7557                         if (error == ASSIGN_SUCCESS) {
7558                                 best_type = decl_type;
7559                         } else if (best_type == NULL) {
7560                                 best_type = decl_type;
7561                         }
7562                 }
7563
7564                 if (best_type != NULL) {
7565                         expected_type = best_type;
7566                 }
7567         }
7568
7569         error                = semantic_assign(expected_type, arg_expr);
7570         argument->expression = create_implicit_cast(arg_expr, expected_type);
7571
7572         if (error != ASSIGN_SUCCESS) {
7573                 /* report exact scope in error messages (like "in argument 3") */
7574                 char buf[64];
7575                 snprintf(buf, sizeof(buf), "call argument %u", pos);
7576                 report_assign_error(error, expected_type, arg_expr,     buf,
7577                                                         &arg_expr->base.source_position);
7578         } else if (warning.traditional || warning.conversion) {
7579                 type_t *const promoted_type = get_default_promoted_type(arg_type);
7580                 if (!types_compatible(expected_type_skip, promoted_type) &&
7581                     !types_compatible(expected_type_skip, type_void_ptr) &&
7582                     !types_compatible(type_void_ptr,      promoted_type)) {
7583                         /* Deliberately show the skipped types in this warning */
7584                         warningf(&arg_expr->base.source_position,
7585                                 "passing call argument %u as '%T' rather than '%T' due to prototype",
7586                                 pos, expected_type_skip, promoted_type);
7587                 }
7588         }
7589 }
7590
7591 /**
7592  * Handle the semantic restrictions of builtin calls
7593  */
7594 static void handle_builtin_argument_restrictions(call_expression_t *call) {
7595         switch (call->function->reference.entity->function.btk) {
7596                 case bk_gnu_builtin_return_address:
7597                 case bk_gnu_builtin_frame_address: {
7598                         /* argument must be constant */
7599                         call_argument_t *argument = call->arguments;
7600
7601                         if (! is_constant_expression(argument->expression)) {
7602                                 errorf(&call->base.source_position,
7603                                        "argument of '%Y' must be a constant expression",
7604                                        call->function->reference.entity->base.symbol);
7605                         }
7606                         break;
7607                 }
7608                 case bk_gnu_builtin_prefetch: {
7609                         /* second and third argument must be constant if existent */
7610                         call_argument_t *rw = call->arguments->next;
7611                         call_argument_t *locality = NULL;
7612
7613                         if (rw != NULL) {
7614                                 if (! is_constant_expression(rw->expression)) {
7615                                         errorf(&call->base.source_position,
7616                                                "second argument of '%Y' must be a constant expression",
7617                                                call->function->reference.entity->base.symbol);
7618                                 }
7619                                 locality = rw->next;
7620                         }
7621                         if (locality != NULL) {
7622                                 if (! is_constant_expression(locality->expression)) {
7623                                         errorf(&call->base.source_position,
7624                                                "third argument of '%Y' must be a constant expression",
7625                                                call->function->reference.entity->base.symbol);
7626                                 }
7627                                 locality = rw->next;
7628                         }
7629                         break;
7630                 }
7631                 default:
7632                         break;
7633         }
7634 }
7635
7636 /**
7637  * Parse a call expression, ie. expression '( ... )'.
7638  *
7639  * @param expression  the function address
7640  */
7641 static expression_t *parse_call_expression(expression_t *expression)
7642 {
7643         expression_t      *result = allocate_expression_zero(EXPR_CALL);
7644         call_expression_t *call   = &result->call;
7645         call->function            = expression;
7646
7647         type_t *const orig_type = expression->base.type;
7648         type_t *const type      = skip_typeref(orig_type);
7649
7650         function_type_t *function_type = NULL;
7651         if (is_type_pointer(type)) {
7652                 type_t *const to_type = skip_typeref(type->pointer.points_to);
7653
7654                 if (is_type_function(to_type)) {
7655                         function_type   = &to_type->function;
7656                         call->base.type = function_type->return_type;
7657                 }
7658         }
7659
7660         if (function_type == NULL && is_type_valid(type)) {
7661                 errorf(HERE,
7662                        "called object '%E' (type '%T') is not a pointer to a function",
7663                        expression, orig_type);
7664         }
7665
7666         /* parse arguments */
7667         eat('(');
7668         add_anchor_token(')');
7669         add_anchor_token(',');
7670
7671         if (token.type != ')') {
7672                 call_argument_t **anchor = &call->arguments;
7673                 for (;;) {
7674                         call_argument_t *argument = allocate_ast_zero(sizeof(*argument));
7675                         argument->expression = parse_assignment_expression();
7676
7677                         *anchor = argument;
7678                         anchor  = &argument->next;
7679
7680                         if (token.type != ',')
7681                                 break;
7682                         next_token();
7683                 }
7684         }
7685         rem_anchor_token(',');
7686         rem_anchor_token(')');
7687         expect(')', end_error);
7688
7689         if (function_type == NULL)
7690                 return result;
7691
7692         /* check type and count of call arguments */
7693         function_parameter_t *parameter = function_type->parameters;
7694         call_argument_t      *argument  = call->arguments;
7695         if (!function_type->unspecified_parameters) {
7696                 for (unsigned pos = 0; parameter != NULL && argument != NULL;
7697                                 parameter = parameter->next, argument = argument->next) {
7698                         check_call_argument(parameter->type, argument, ++pos);
7699                 }
7700
7701                 if (parameter != NULL) {
7702                         errorf(HERE, "too few arguments to function '%E'", expression);
7703                 } else if (argument != NULL && !function_type->variadic) {
7704                         errorf(HERE, "too many arguments to function '%E'", expression);
7705                 }
7706         }
7707
7708         /* do default promotion for other arguments */
7709         for (; argument != NULL; argument = argument->next) {
7710                 type_t *type = argument->expression->base.type;
7711
7712                 type = get_default_promoted_type(type);
7713
7714                 argument->expression
7715                         = create_implicit_cast(argument->expression, type);
7716         }
7717
7718         check_format(&result->call);
7719
7720         if (warning.aggregate_return &&
7721             is_type_compound(skip_typeref(function_type->return_type))) {
7722                 warningf(&result->base.source_position,
7723                          "function call has aggregate value");
7724         }
7725
7726         if (call->function->kind == EXPR_REFERENCE) {
7727                 reference_expression_t *reference = &call->function->reference;
7728                 if (reference->entity->kind == ENTITY_FUNCTION &&
7729                     reference->entity->function.btk != bk_none)
7730                         handle_builtin_argument_restrictions(call);
7731         }
7732
7733 end_error:
7734         return result;
7735 }
7736
7737 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
7738
7739 static bool same_compound_type(const type_t *type1, const type_t *type2)
7740 {
7741         return
7742                 is_type_compound(type1) &&
7743                 type1->kind == type2->kind &&
7744                 type1->compound.compound == type2->compound.compound;
7745 }
7746
7747 static expression_t const *get_reference_address(expression_t const *expr)
7748 {
7749         bool regular_take_address = true;
7750         for (;;) {
7751                 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
7752                         expr = expr->unary.value;
7753                 } else {
7754                         regular_take_address = false;
7755                 }
7756
7757                 if (expr->kind != EXPR_UNARY_DEREFERENCE)
7758                         break;
7759
7760                 expr = expr->unary.value;
7761         }
7762
7763         if (expr->kind != EXPR_REFERENCE)
7764                 return NULL;
7765
7766         /* special case for functions which are automatically converted to a
7767          * pointer to function without an extra TAKE_ADDRESS operation */
7768         if (!regular_take_address &&
7769                         expr->reference.entity->kind != ENTITY_FUNCTION) {
7770                 return NULL;
7771         }
7772
7773         return expr;
7774 }
7775
7776 static void warn_reference_address_as_bool(expression_t const* expr)
7777 {
7778         if (!warning.address)
7779                 return;
7780
7781         expr = get_reference_address(expr);
7782         if (expr != NULL) {
7783                 warningf(&expr->base.source_position,
7784                          "the address of '%Y' will always evaluate as 'true'",
7785                          expr->reference.entity->base.symbol);
7786         }
7787 }
7788
7789 static void warn_assignment_in_condition(const expression_t *const expr)
7790 {
7791         if (!warning.parentheses)
7792                 return;
7793         if (expr->base.kind != EXPR_BINARY_ASSIGN)
7794                 return;
7795         if (expr->base.parenthesized)
7796                 return;
7797         warningf(&expr->base.source_position,
7798                         "suggest parentheses around assignment used as truth value");
7799 }
7800
7801 static void semantic_condition(expression_t const *const expr,
7802                                char const *const context)
7803 {
7804         type_t *const type = skip_typeref(expr->base.type);
7805         if (is_type_scalar(type)) {
7806                 warn_reference_address_as_bool(expr);
7807                 warn_assignment_in_condition(expr);
7808         } else if (is_type_valid(type)) {
7809                 errorf(&expr->base.source_position,
7810                                 "%s must have scalar type", context);
7811         }
7812 }
7813
7814 /**
7815  * Parse a conditional expression, ie. 'expression ? ... : ...'.
7816  *
7817  * @param expression  the conditional expression
7818  */
7819 static expression_t *parse_conditional_expression(expression_t *expression)
7820 {
7821         expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
7822
7823         conditional_expression_t *conditional = &result->conditional;
7824         conditional->condition                = expression;
7825
7826         eat('?');
7827         add_anchor_token(':');
7828
7829         /* §6.5.15:2  The first operand shall have scalar type. */
7830         semantic_condition(expression, "condition of conditional operator");
7831
7832         expression_t *true_expression = expression;
7833         bool          gnu_cond = false;
7834         if (GNU_MODE && token.type == ':') {
7835                 gnu_cond = true;
7836         } else {
7837                 true_expression = parse_expression();
7838         }
7839         rem_anchor_token(':');
7840         expect(':', end_error);
7841 end_error:;
7842         expression_t *false_expression =
7843                 parse_sub_expression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL);
7844
7845         type_t *const orig_true_type  = true_expression->base.type;
7846         type_t *const orig_false_type = false_expression->base.type;
7847         type_t *const true_type       = skip_typeref(orig_true_type);
7848         type_t *const false_type      = skip_typeref(orig_false_type);
7849
7850         /* 6.5.15.3 */
7851         type_t *result_type;
7852         if (is_type_atomic(true_type,  ATOMIC_TYPE_VOID) ||
7853                         is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7854                 /* ISO/IEC 14882:1998(E) §5.16:2 */
7855                 if (true_expression->kind == EXPR_UNARY_THROW) {
7856                         result_type = false_type;
7857                 } else if (false_expression->kind == EXPR_UNARY_THROW) {
7858                         result_type = true_type;
7859                 } else {
7860                         if (warning.other && (
7861                                                 !is_type_atomic(true_type,  ATOMIC_TYPE_VOID) ||
7862                                                 !is_type_atomic(false_type, ATOMIC_TYPE_VOID)
7863                                         )) {
7864                                 warningf(&conditional->base.source_position,
7865                                                 "ISO C forbids conditional expression with only one void side");
7866                         }
7867                         result_type = type_void;
7868                 }
7869         } else if (is_type_arithmetic(true_type)
7870                    && is_type_arithmetic(false_type)) {
7871                 result_type = semantic_arithmetic(true_type, false_type);
7872
7873                 true_expression  = create_implicit_cast(true_expression, result_type);
7874                 false_expression = create_implicit_cast(false_expression, result_type);
7875
7876                 conditional->true_expression  = true_expression;
7877                 conditional->false_expression = false_expression;
7878                 conditional->base.type        = result_type;
7879         } else if (same_compound_type(true_type, false_type)) {
7880                 /* just take 1 of the 2 types */
7881                 result_type = true_type;
7882         } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
7883                 type_t *pointer_type;
7884                 type_t *other_type;
7885                 expression_t *other_expression;
7886                 if (is_type_pointer(true_type) &&
7887                                 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
7888                         pointer_type     = true_type;
7889                         other_type       = false_type;
7890                         other_expression = false_expression;
7891                 } else {
7892                         pointer_type     = false_type;
7893                         other_type       = true_type;
7894                         other_expression = true_expression;
7895                 }
7896
7897                 if (is_null_pointer_constant(other_expression)) {
7898                         result_type = pointer_type;
7899                 } else if (is_type_pointer(other_type)) {
7900                         type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
7901                         type_t *to2 = skip_typeref(other_type->pointer.points_to);
7902
7903                         type_t *to;
7904                         if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
7905                             is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
7906                                 to = type_void;
7907                         } else if (types_compatible(get_unqualified_type(to1),
7908                                                     get_unqualified_type(to2))) {
7909                                 to = to1;
7910                         } else {
7911                                 if (warning.other) {
7912                                         warningf(&conditional->base.source_position,
7913                                                         "pointer types '%T' and '%T' in conditional expression are incompatible",
7914                                                         true_type, false_type);
7915                                 }
7916                                 to = type_void;
7917                         }
7918
7919                         type_t *const type =
7920                                 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
7921                         result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
7922                 } else if (is_type_integer(other_type)) {
7923                         if (warning.other) {
7924                                 warningf(&conditional->base.source_position,
7925                                                 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
7926                         }
7927                         result_type = pointer_type;
7928                 } else {
7929                         if (is_type_valid(other_type)) {
7930                                 type_error_incompatible("while parsing conditional",
7931                                                 &expression->base.source_position, true_type, false_type);
7932                         }
7933                         result_type = type_error_type;
7934                 }
7935         } else {
7936                 if (is_type_valid(true_type) && is_type_valid(false_type)) {
7937                         type_error_incompatible("while parsing conditional",
7938                                                 &conditional->base.source_position, true_type,
7939                                                 false_type);
7940                 }
7941                 result_type = type_error_type;
7942         }
7943
7944         conditional->true_expression
7945                 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
7946         conditional->false_expression
7947                 = create_implicit_cast(false_expression, result_type);
7948         conditional->base.type = result_type;
7949         return result;
7950 }
7951
7952 /**
7953  * Parse an extension expression.
7954  */
7955 static expression_t *parse_extension(void)
7956 {
7957         eat(T___extension__);
7958
7959         bool old_gcc_extension   = in_gcc_extension;
7960         in_gcc_extension         = true;
7961         expression_t *expression = parse_sub_expression(PREC_UNARY);
7962         in_gcc_extension         = old_gcc_extension;
7963         return expression;
7964 }
7965
7966 /**
7967  * Parse a __builtin_classify_type() expression.
7968  */
7969 static expression_t *parse_builtin_classify_type(void)
7970 {
7971         expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
7972         result->base.type    = type_int;
7973
7974         eat(T___builtin_classify_type);
7975
7976         expect('(', end_error);
7977         add_anchor_token(')');
7978         expression_t *expression = parse_expression();
7979         rem_anchor_token(')');
7980         expect(')', end_error);
7981         result->classify_type.type_expression = expression;
7982
7983         return result;
7984 end_error:
7985         return create_invalid_expression();
7986 }
7987
7988 /**
7989  * Parse a delete expression
7990  * ISO/IEC 14882:1998(E) §5.3.5
7991  */
7992 static expression_t *parse_delete(void)
7993 {
7994         expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE);
7995         result->base.type          = type_void;
7996
7997         eat(T_delete);
7998
7999         if (token.type == '[') {
8000                 next_token();
8001                 result->kind = EXPR_UNARY_DELETE_ARRAY;
8002                 expect(']', end_error);
8003 end_error:;
8004         }
8005
8006         expression_t *const value = parse_sub_expression(PREC_CAST);
8007         result->unary.value = value;
8008
8009         type_t *const type = skip_typeref(value->base.type);
8010         if (!is_type_pointer(type)) {
8011                 if (is_type_valid(type)) {
8012                         errorf(&value->base.source_position,
8013                                         "operand of delete must have pointer type");
8014                 }
8015         } else if (warning.other &&
8016                         is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) {
8017                 warningf(&value->base.source_position,
8018                                 "deleting 'void*' is undefined");
8019         }
8020
8021         return result;
8022 }
8023
8024 /**
8025  * Parse a throw expression
8026  * ISO/IEC 14882:1998(E) §15:1
8027  */
8028 static expression_t *parse_throw(void)
8029 {
8030         expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW);
8031         result->base.type          = type_void;
8032
8033         eat(T_throw);
8034
8035         expression_t *value = NULL;
8036         switch (token.type) {
8037                 EXPRESSION_START {
8038                         value = parse_assignment_expression();
8039                         /* ISO/IEC 14882:1998(E) §15.1:3 */
8040                         type_t *const orig_type = value->base.type;
8041                         type_t *const type      = skip_typeref(orig_type);
8042                         if (is_type_incomplete(type)) {
8043                                 errorf(&value->base.source_position,
8044                                                 "cannot throw object of incomplete type '%T'", orig_type);
8045                         } else if (is_type_pointer(type)) {
8046                                 type_t *const points_to = skip_typeref(type->pointer.points_to);
8047                                 if (is_type_incomplete(points_to) &&
8048                                                 !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8049                                         errorf(&value->base.source_position,
8050                                                         "cannot throw pointer to incomplete type '%T'", orig_type);
8051                                 }
8052                         }
8053                 }
8054
8055                 default:
8056                         break;
8057         }
8058         result->unary.value = value;
8059
8060         return result;
8061 }
8062
8063 static bool check_pointer_arithmetic(const source_position_t *source_position,
8064                                      type_t *pointer_type,
8065                                      type_t *orig_pointer_type)
8066 {
8067         type_t *points_to = pointer_type->pointer.points_to;
8068         points_to = skip_typeref(points_to);
8069
8070         if (is_type_incomplete(points_to)) {
8071                 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
8072                         errorf(source_position,
8073                                "arithmetic with pointer to incomplete type '%T' not allowed",
8074                                orig_pointer_type);
8075                         return false;
8076                 } else if (warning.pointer_arith) {
8077                         warningf(source_position,
8078                                  "pointer of type '%T' used in arithmetic",
8079                                  orig_pointer_type);
8080                 }
8081         } else if (is_type_function(points_to)) {
8082                 if (!GNU_MODE) {
8083                         errorf(source_position,
8084                                "arithmetic with pointer to function type '%T' not allowed",
8085                                orig_pointer_type);
8086                         return false;
8087                 } else if (warning.pointer_arith) {
8088                         warningf(source_position,
8089                                  "pointer to a function '%T' used in arithmetic",
8090                                  orig_pointer_type);
8091                 }
8092         }
8093         return true;
8094 }
8095
8096 static bool is_lvalue(const expression_t *expression)
8097 {
8098         /* TODO: doesn't seem to be consistent with §6.3.2.1:1 */
8099         switch (expression->kind) {
8100         case EXPR_ARRAY_ACCESS:
8101         case EXPR_COMPOUND_LITERAL:
8102         case EXPR_REFERENCE:
8103         case EXPR_SELECT:
8104         case EXPR_UNARY_DEREFERENCE:
8105                 return true;
8106
8107         default: {
8108                 type_t *type = skip_typeref(expression->base.type);
8109                 return
8110                         /* ISO/IEC 14882:1998(E) §3.10:3 */
8111                         is_type_reference(type) ||
8112                         /* Claim it is an lvalue, if the type is invalid.  There was a parse
8113                          * error before, which maybe prevented properly recognizing it as
8114                          * lvalue. */
8115                         !is_type_valid(type);
8116         }
8117         }
8118 }
8119
8120 static void semantic_incdec(unary_expression_t *expression)
8121 {
8122         type_t *const orig_type = expression->value->base.type;
8123         type_t *const type      = skip_typeref(orig_type);
8124         if (is_type_pointer(type)) {
8125                 if (!check_pointer_arithmetic(&expression->base.source_position,
8126                                               type, orig_type)) {
8127                         return;
8128                 }
8129         } else if (!is_type_real(type) && is_type_valid(type)) {
8130                 /* TODO: improve error message */
8131                 errorf(&expression->base.source_position,
8132                        "operation needs an arithmetic or pointer type");
8133                 return;
8134         }
8135         if (!is_lvalue(expression->value)) {
8136                 /* TODO: improve error message */
8137                 errorf(&expression->base.source_position, "lvalue required as operand");
8138         }
8139         expression->base.type = orig_type;
8140 }
8141
8142 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
8143 {
8144         type_t *const orig_type = expression->value->base.type;
8145         type_t *const type      = skip_typeref(orig_type);
8146         if (!is_type_arithmetic(type)) {
8147                 if (is_type_valid(type)) {
8148                         /* TODO: improve error message */
8149                         errorf(&expression->base.source_position,
8150                                 "operation needs an arithmetic type");
8151                 }
8152                 return;
8153         }
8154
8155         expression->base.type = orig_type;
8156 }
8157
8158 static void semantic_unexpr_plus(unary_expression_t *expression)
8159 {
8160         semantic_unexpr_arithmetic(expression);
8161         if (warning.traditional)
8162                 warningf(&expression->base.source_position,
8163                         "traditional C rejects the unary plus operator");
8164 }
8165
8166 static void semantic_not(unary_expression_t *expression)
8167 {
8168         /* §6.5.3.3:1  The operand [...] of the ! operator, scalar type. */
8169         semantic_condition(expression->value, "operand of !");
8170         expression->base.type = c_mode & _CXX ? type_bool : type_int;
8171 }
8172
8173 static void semantic_unexpr_integer(unary_expression_t *expression)
8174 {
8175         type_t *const orig_type = expression->value->base.type;
8176         type_t *const type      = skip_typeref(orig_type);
8177         if (!is_type_integer(type)) {
8178                 if (is_type_valid(type)) {
8179                         errorf(&expression->base.source_position,
8180                                "operand of ~ must be of integer type");
8181                 }
8182                 return;
8183         }
8184
8185         expression->base.type = orig_type;
8186 }
8187
8188 static void semantic_dereference(unary_expression_t *expression)
8189 {
8190         type_t *const orig_type = expression->value->base.type;
8191         type_t *const type      = skip_typeref(orig_type);
8192         if (!is_type_pointer(type)) {
8193                 if (is_type_valid(type)) {
8194                         errorf(&expression->base.source_position,
8195                                "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
8196                 }
8197                 return;
8198         }
8199
8200         type_t *result_type   = type->pointer.points_to;
8201         result_type           = automatic_type_conversion(result_type);
8202         expression->base.type = result_type;
8203 }
8204
8205 /**
8206  * Record that an address is taken (expression represents an lvalue).
8207  *
8208  * @param expression       the expression
8209  * @param may_be_register  if true, the expression might be an register
8210  */
8211 static void set_address_taken(expression_t *expression, bool may_be_register)
8212 {
8213         if (expression->kind != EXPR_REFERENCE)
8214                 return;
8215
8216         entity_t *const entity = expression->reference.entity;
8217
8218         if (entity->kind != ENTITY_VARIABLE && entity->kind != ENTITY_PARAMETER)
8219                 return;
8220
8221         if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER
8222                         && !may_be_register) {
8223                 errorf(&expression->base.source_position,
8224                                 "address of register %s '%Y' requested",
8225                                 get_entity_kind_name(entity->kind),     entity->base.symbol);
8226         }
8227
8228         if (entity->kind == ENTITY_VARIABLE) {
8229                 entity->variable.address_taken = true;
8230         } else {
8231                 assert(entity->kind == ENTITY_PARAMETER);
8232                 entity->parameter.address_taken = true;
8233         }
8234 }
8235
8236 /**
8237  * Check the semantic of the address taken expression.
8238  */
8239 static void semantic_take_addr(unary_expression_t *expression)
8240 {
8241         expression_t *value = expression->value;
8242         value->base.type    = revert_automatic_type_conversion(value);
8243
8244         type_t *orig_type = value->base.type;
8245         type_t *type      = skip_typeref(orig_type);
8246         if (!is_type_valid(type))
8247                 return;
8248
8249         /* §6.5.3.2 */
8250         if (!is_lvalue(value)) {
8251                 errorf(&expression->base.source_position, "'&' requires an lvalue");
8252         }
8253         if (type->kind == TYPE_BITFIELD) {
8254                 errorf(&expression->base.source_position,
8255                        "'&' not allowed on object with bitfield type '%T'",
8256                        type);
8257         }
8258
8259         set_address_taken(value, false);
8260
8261         expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
8262 }
8263
8264 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
8265 static expression_t *parse_##unexpression_type(void)                         \
8266 {                                                                            \
8267         expression_t *unary_expression                                           \
8268                 = allocate_expression_zero(unexpression_type);                       \
8269         eat(token_type);                                                         \
8270         unary_expression->unary.value = parse_sub_expression(PREC_UNARY);        \
8271                                                                                  \
8272         sfunc(&unary_expression->unary);                                         \
8273                                                                                  \
8274         return unary_expression;                                                 \
8275 }
8276
8277 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
8278                                semantic_unexpr_arithmetic)
8279 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
8280                                semantic_unexpr_plus)
8281 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
8282                                semantic_not)
8283 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
8284                                semantic_dereference)
8285 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
8286                                semantic_take_addr)
8287 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
8288                                semantic_unexpr_integer)
8289 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS,   EXPR_UNARY_PREFIX_INCREMENT,
8290                                semantic_incdec)
8291 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
8292                                semantic_incdec)
8293
8294 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
8295                                                sfunc)                         \
8296 static expression_t *parse_##unexpression_type(expression_t *left)            \
8297 {                                                                             \
8298         expression_t *unary_expression                                            \
8299                 = allocate_expression_zero(unexpression_type);                        \
8300         eat(token_type);                                                          \
8301         unary_expression->unary.value = left;                                     \
8302                                                                                   \
8303         sfunc(&unary_expression->unary);                                          \
8304                                                                               \
8305         return unary_expression;                                                  \
8306 }
8307
8308 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
8309                                        EXPR_UNARY_POSTFIX_INCREMENT,
8310                                        semantic_incdec)
8311 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
8312                                        EXPR_UNARY_POSTFIX_DECREMENT,
8313                                        semantic_incdec)
8314
8315 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
8316 {
8317         /* TODO: handle complex + imaginary types */
8318
8319         type_left  = get_unqualified_type(type_left);
8320         type_right = get_unqualified_type(type_right);
8321
8322         /* §6.3.1.8 Usual arithmetic conversions */
8323         if (type_left == type_long_double || type_right == type_long_double) {
8324                 return type_long_double;
8325         } else if (type_left == type_double || type_right == type_double) {
8326                 return type_double;
8327         } else if (type_left == type_float || type_right == type_float) {
8328                 return type_float;
8329         }
8330
8331         type_left  = promote_integer(type_left);
8332         type_right = promote_integer(type_right);
8333
8334         if (type_left == type_right)
8335                 return type_left;
8336
8337         bool const signed_left  = is_type_signed(type_left);
8338         bool const signed_right = is_type_signed(type_right);
8339         int const  rank_left    = get_rank(type_left);
8340         int const  rank_right   = get_rank(type_right);
8341
8342         if (signed_left == signed_right)
8343                 return rank_left >= rank_right ? type_left : type_right;
8344
8345         int     s_rank;
8346         int     u_rank;
8347         type_t *s_type;
8348         type_t *u_type;
8349         if (signed_left) {
8350                 s_rank = rank_left;
8351                 s_type = type_left;
8352                 u_rank = rank_right;
8353                 u_type = type_right;
8354         } else {
8355                 s_rank = rank_right;
8356                 s_type = type_right;
8357                 u_rank = rank_left;
8358                 u_type = type_left;
8359         }
8360
8361         if (u_rank >= s_rank)
8362                 return u_type;
8363
8364         /* casting rank to atomic_type_kind is a bit hacky, but makes things
8365          * easier here... */
8366         if (get_atomic_type_size((atomic_type_kind_t) s_rank)
8367                         > get_atomic_type_size((atomic_type_kind_t) u_rank))
8368                 return s_type;
8369
8370         switch (s_rank) {
8371                 case ATOMIC_TYPE_INT:      return type_unsigned_int;
8372                 case ATOMIC_TYPE_LONG:     return type_unsigned_long;
8373                 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
8374
8375                 default: panic("invalid atomic type");
8376         }
8377 }
8378
8379 /**
8380  * Check the semantic restrictions for a binary expression.
8381  */
8382 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
8383 {
8384         expression_t *const left            = expression->left;
8385         expression_t *const right           = expression->right;
8386         type_t       *const orig_type_left  = left->base.type;
8387         type_t       *const orig_type_right = right->base.type;
8388         type_t       *const type_left       = skip_typeref(orig_type_left);
8389         type_t       *const type_right      = skip_typeref(orig_type_right);
8390
8391         if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8392                 /* TODO: improve error message */
8393                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8394                         errorf(&expression->base.source_position,
8395                                "operation needs arithmetic types");
8396                 }
8397                 return;
8398         }
8399
8400         type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8401         expression->left      = create_implicit_cast(left, arithmetic_type);
8402         expression->right     = create_implicit_cast(right, arithmetic_type);
8403         expression->base.type = arithmetic_type;
8404 }
8405
8406 static void warn_div_by_zero(binary_expression_t const *const expression)
8407 {
8408         if (!warning.div_by_zero ||
8409             !is_type_integer(expression->base.type))
8410                 return;
8411
8412         expression_t const *const right = expression->right;
8413         /* The type of the right operand can be different for /= */
8414         if (is_type_integer(right->base.type) &&
8415             is_constant_expression(right)     &&
8416             !fold_constant_to_bool(right)) {
8417                 warningf(&expression->base.source_position, "division by zero");
8418         }
8419 }
8420
8421 /**
8422  * Check the semantic restrictions for a div/mod expression.
8423  */
8424 static void semantic_divmod_arithmetic(binary_expression_t *expression)
8425 {
8426         semantic_binexpr_arithmetic(expression);
8427         warn_div_by_zero(expression);
8428 }
8429
8430 static void warn_addsub_in_shift(const expression_t *const expr)
8431 {
8432         if (expr->base.parenthesized)
8433                 return;
8434
8435         char op;
8436         switch (expr->kind) {
8437                 case EXPR_BINARY_ADD: op = '+'; break;
8438                 case EXPR_BINARY_SUB: op = '-'; break;
8439                 default:              return;
8440         }
8441
8442         warningf(&expr->base.source_position,
8443                         "suggest parentheses around '%c' inside shift", op);
8444 }
8445
8446 static bool semantic_shift(binary_expression_t *expression)
8447 {
8448         expression_t *const left            = expression->left;
8449         expression_t *const right           = expression->right;
8450         type_t       *const orig_type_left  = left->base.type;
8451         type_t       *const orig_type_right = right->base.type;
8452         type_t       *      type_left       = skip_typeref(orig_type_left);
8453         type_t       *      type_right      = skip_typeref(orig_type_right);
8454
8455         if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8456                 /* TODO: improve error message */
8457                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8458                         errorf(&expression->base.source_position,
8459                                "operands of shift operation must have integer types");
8460                 }
8461                 return false;
8462         }
8463
8464         type_left = promote_integer(type_left);
8465
8466         if (is_constant_expression(right)) {
8467                 long count = fold_constant_to_int(right);
8468                 if (count < 0) {
8469                         warningf(&right->base.source_position,
8470                                         "shift count must be non-negative");
8471                 } else if ((unsigned long)count >=
8472                                 get_atomic_type_size(type_left->atomic.akind) * 8) {
8473                         warningf(&right->base.source_position,
8474                                         "shift count must be less than type width");
8475                 }
8476         }
8477
8478         type_right        = promote_integer(type_right);
8479         expression->right = create_implicit_cast(right, type_right);
8480
8481         return true;
8482 }
8483
8484 static void semantic_shift_op(binary_expression_t *expression)
8485 {
8486         expression_t *const left  = expression->left;
8487         expression_t *const right = expression->right;
8488
8489         if (!semantic_shift(expression))
8490                 return;
8491
8492         if (warning.parentheses) {
8493                 warn_addsub_in_shift(left);
8494                 warn_addsub_in_shift(right);
8495         }
8496
8497         type_t *const orig_type_left = left->base.type;
8498         type_t *      type_left      = skip_typeref(orig_type_left);
8499
8500         type_left             = promote_integer(type_left);
8501         expression->left      = create_implicit_cast(left, type_left);
8502         expression->base.type = type_left;
8503 }
8504
8505 static void semantic_add(binary_expression_t *expression)
8506 {
8507         expression_t *const left            = expression->left;
8508         expression_t *const right           = expression->right;
8509         type_t       *const orig_type_left  = left->base.type;
8510         type_t       *const orig_type_right = right->base.type;
8511         type_t       *const type_left       = skip_typeref(orig_type_left);
8512         type_t       *const type_right      = skip_typeref(orig_type_right);
8513
8514         /* §6.5.6 */
8515         if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8516                 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8517                 expression->left  = create_implicit_cast(left, arithmetic_type);
8518                 expression->right = create_implicit_cast(right, arithmetic_type);
8519                 expression->base.type = arithmetic_type;
8520         } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8521                 check_pointer_arithmetic(&expression->base.source_position,
8522                                          type_left, orig_type_left);
8523                 expression->base.type = type_left;
8524         } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
8525                 check_pointer_arithmetic(&expression->base.source_position,
8526                                          type_right, orig_type_right);
8527                 expression->base.type = type_right;
8528         } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8529                 errorf(&expression->base.source_position,
8530                        "invalid operands to binary + ('%T', '%T')",
8531                        orig_type_left, orig_type_right);
8532         }
8533 }
8534
8535 static void semantic_sub(binary_expression_t *expression)
8536 {
8537         expression_t            *const left            = expression->left;
8538         expression_t            *const right           = expression->right;
8539         type_t                  *const orig_type_left  = left->base.type;
8540         type_t                  *const orig_type_right = right->base.type;
8541         type_t                  *const type_left       = skip_typeref(orig_type_left);
8542         type_t                  *const type_right      = skip_typeref(orig_type_right);
8543         source_position_t const *const pos             = &expression->base.source_position;
8544
8545         /* §5.6.5 */
8546         if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8547                 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8548                 expression->left        = create_implicit_cast(left, arithmetic_type);
8549                 expression->right       = create_implicit_cast(right, arithmetic_type);
8550                 expression->base.type =  arithmetic_type;
8551         } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8552                 check_pointer_arithmetic(&expression->base.source_position,
8553                                          type_left, orig_type_left);
8554                 expression->base.type = type_left;
8555         } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8556                 type_t *const unqual_left  = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
8557                 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
8558                 if (!types_compatible(unqual_left, unqual_right)) {
8559                         errorf(pos,
8560                                "subtracting pointers to incompatible types '%T' and '%T'",
8561                                orig_type_left, orig_type_right);
8562                 } else if (!is_type_object(unqual_left)) {
8563                         if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
8564                                 errorf(pos, "subtracting pointers to non-object types '%T'",
8565                                        orig_type_left);
8566                         } else if (warning.other) {
8567                                 warningf(pos, "subtracting pointers to void");
8568                         }
8569                 }
8570                 expression->base.type = type_ptrdiff_t;
8571         } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8572                 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
8573                        orig_type_left, orig_type_right);
8574         }
8575 }
8576
8577 static void warn_string_literal_address(expression_t const* expr)
8578 {
8579         while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
8580                 expr = expr->unary.value;
8581                 if (expr->kind != EXPR_UNARY_DEREFERENCE)
8582                         return;
8583                 expr = expr->unary.value;
8584         }
8585
8586         if (expr->kind == EXPR_STRING_LITERAL ||
8587             expr->kind == EXPR_WIDE_STRING_LITERAL) {
8588                 warningf(&expr->base.source_position,
8589                         "comparison with string literal results in unspecified behaviour");
8590         }
8591 }
8592
8593 static void warn_comparison_in_comparison(const expression_t *const expr)
8594 {
8595         if (expr->base.parenthesized)
8596                 return;
8597         switch (expr->base.kind) {
8598                 case EXPR_BINARY_LESS:
8599                 case EXPR_BINARY_GREATER:
8600                 case EXPR_BINARY_LESSEQUAL:
8601                 case EXPR_BINARY_GREATEREQUAL:
8602                 case EXPR_BINARY_NOTEQUAL:
8603                 case EXPR_BINARY_EQUAL:
8604                         warningf(&expr->base.source_position,
8605                                         "comparisons like 'x <= y < z' do not have their mathematical meaning");
8606                         break;
8607                 default:
8608                         break;
8609         }
8610 }
8611
8612 static bool maybe_negative(expression_t const *const expr)
8613 {
8614         return
8615                 !is_constant_expression(expr) ||
8616                 fold_constant_to_int(expr) < 0;
8617 }
8618
8619 /**
8620  * Check the semantics of comparison expressions.
8621  *
8622  * @param expression   The expression to check.
8623  */
8624 static void semantic_comparison(binary_expression_t *expression)
8625 {
8626         expression_t *left  = expression->left;
8627         expression_t *right = expression->right;
8628
8629         if (warning.address) {
8630                 warn_string_literal_address(left);
8631                 warn_string_literal_address(right);
8632
8633                 expression_t const* const func_left = get_reference_address(left);
8634                 if (func_left != NULL && is_null_pointer_constant(right)) {
8635                         warningf(&expression->base.source_position,
8636                                  "the address of '%Y' will never be NULL",
8637                                  func_left->reference.entity->base.symbol);
8638                 }
8639
8640                 expression_t const* const func_right = get_reference_address(right);
8641                 if (func_right != NULL && is_null_pointer_constant(right)) {
8642                         warningf(&expression->base.source_position,
8643                                  "the address of '%Y' will never be NULL",
8644                                  func_right->reference.entity->base.symbol);
8645                 }
8646         }
8647
8648         if (warning.parentheses) {
8649                 warn_comparison_in_comparison(left);
8650                 warn_comparison_in_comparison(right);
8651         }
8652
8653         type_t *orig_type_left  = left->base.type;
8654         type_t *orig_type_right = right->base.type;
8655         type_t *type_left       = skip_typeref(orig_type_left);
8656         type_t *type_right      = skip_typeref(orig_type_right);
8657
8658         /* TODO non-arithmetic types */
8659         if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8660                 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8661
8662                 /* test for signed vs unsigned compares */
8663                 if (warning.sign_compare && is_type_integer(arithmetic_type)) {
8664                         bool const signed_left  = is_type_signed(type_left);
8665                         bool const signed_right = is_type_signed(type_right);
8666                         if (signed_left != signed_right) {
8667                                 /* FIXME long long needs better const folding magic */
8668                                 /* TODO check whether constant value can be represented by other type */
8669                                 if ((signed_left  && maybe_negative(left)) ||
8670                                                 (signed_right && maybe_negative(right))) {
8671                                         warningf(&expression->base.source_position,
8672                                                         "comparison between signed and unsigned");
8673                                 }
8674                         }
8675                 }
8676
8677                 expression->left        = create_implicit_cast(left, arithmetic_type);
8678                 expression->right       = create_implicit_cast(right, arithmetic_type);
8679                 expression->base.type   = arithmetic_type;
8680                 if (warning.float_equal &&
8681                     (expression->base.kind == EXPR_BINARY_EQUAL ||
8682                      expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
8683                     is_type_float(arithmetic_type)) {
8684                         warningf(&expression->base.source_position,
8685                                  "comparing floating point with == or != is unsafe");
8686                 }
8687         } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8688                 /* TODO check compatibility */
8689         } else if (is_type_pointer(type_left)) {
8690                 expression->right = create_implicit_cast(right, type_left);
8691         } else if (is_type_pointer(type_right)) {
8692                 expression->left = create_implicit_cast(left, type_right);
8693         } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8694                 type_error_incompatible("invalid operands in comparison",
8695                                         &expression->base.source_position,
8696                                         type_left, type_right);
8697         }
8698         expression->base.type = c_mode & _CXX ? type_bool : type_int;
8699 }
8700
8701 /**
8702  * Checks if a compound type has constant fields.
8703  */
8704 static bool has_const_fields(const compound_type_t *type)
8705 {
8706         compound_t *compound = type->compound;
8707         entity_t   *entry    = compound->members.entities;
8708
8709         for (; entry != NULL; entry = entry->base.next) {
8710                 if (!is_declaration(entry))
8711                         continue;
8712
8713                 const type_t *decl_type = skip_typeref(entry->declaration.type);
8714                 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
8715                         return true;
8716         }
8717
8718         return false;
8719 }
8720
8721 static bool is_valid_assignment_lhs(expression_t const* const left)
8722 {
8723         type_t *const orig_type_left = revert_automatic_type_conversion(left);
8724         type_t *const type_left      = skip_typeref(orig_type_left);
8725
8726         if (!is_lvalue(left)) {
8727                 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
8728                        left);
8729                 return false;
8730         }
8731
8732         if (left->kind == EXPR_REFERENCE
8733                         && left->reference.entity->kind == ENTITY_FUNCTION) {
8734                 errorf(HERE, "cannot assign to function '%E'", left);
8735                 return false;
8736         }
8737
8738         if (is_type_array(type_left)) {
8739                 errorf(HERE, "cannot assign to array '%E'", left);
8740                 return false;
8741         }
8742         if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
8743                 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
8744                        orig_type_left);
8745                 return false;
8746         }
8747         if (is_type_incomplete(type_left)) {
8748                 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
8749                        left, orig_type_left);
8750                 return false;
8751         }
8752         if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
8753                 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
8754                        left, orig_type_left);
8755                 return false;
8756         }
8757
8758         return true;
8759 }
8760
8761 static void semantic_arithmetic_assign(binary_expression_t *expression)
8762 {
8763         expression_t *left            = expression->left;
8764         expression_t *right           = expression->right;
8765         type_t       *orig_type_left  = left->base.type;
8766         type_t       *orig_type_right = right->base.type;
8767
8768         if (!is_valid_assignment_lhs(left))
8769                 return;
8770
8771         type_t *type_left  = skip_typeref(orig_type_left);
8772         type_t *type_right = skip_typeref(orig_type_right);
8773
8774         if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8775                 /* TODO: improve error message */
8776                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8777                         errorf(&expression->base.source_position,
8778                                "operation needs arithmetic types");
8779                 }
8780                 return;
8781         }
8782
8783         /* combined instructions are tricky. We can't create an implicit cast on
8784          * the left side, because we need the uncasted form for the store.
8785          * The ast2firm pass has to know that left_type must be right_type
8786          * for the arithmetic operation and create a cast by itself */
8787         type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8788         expression->right       = create_implicit_cast(right, arithmetic_type);
8789         expression->base.type   = type_left;
8790 }
8791
8792 static void semantic_divmod_assign(binary_expression_t *expression)
8793 {
8794         semantic_arithmetic_assign(expression);
8795         warn_div_by_zero(expression);
8796 }
8797
8798 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
8799 {
8800         expression_t *const left            = expression->left;
8801         expression_t *const right           = expression->right;
8802         type_t       *const orig_type_left  = left->base.type;
8803         type_t       *const orig_type_right = right->base.type;
8804         type_t       *const type_left       = skip_typeref(orig_type_left);
8805         type_t       *const type_right      = skip_typeref(orig_type_right);
8806
8807         if (!is_valid_assignment_lhs(left))
8808                 return;
8809
8810         if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8811                 /* combined instructions are tricky. We can't create an implicit cast on
8812                  * the left side, because we need the uncasted form for the store.
8813                  * The ast2firm pass has to know that left_type must be right_type
8814                  * for the arithmetic operation and create a cast by itself */
8815                 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
8816                 expression->right     = create_implicit_cast(right, arithmetic_type);
8817                 expression->base.type = type_left;
8818         } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8819                 check_pointer_arithmetic(&expression->base.source_position,
8820                                          type_left, orig_type_left);
8821                 expression->base.type = type_left;
8822         } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8823                 errorf(&expression->base.source_position,
8824                        "incompatible types '%T' and '%T' in assignment",
8825                        orig_type_left, orig_type_right);
8826         }
8827 }
8828
8829 static void semantic_integer_assign(binary_expression_t *expression)
8830 {
8831         expression_t *left            = expression->left;
8832         expression_t *right           = expression->right;
8833         type_t       *orig_type_left  = left->base.type;
8834         type_t       *orig_type_right = right->base.type;
8835
8836         if (!is_valid_assignment_lhs(left))
8837                 return;
8838
8839         type_t *type_left  = skip_typeref(orig_type_left);
8840         type_t *type_right = skip_typeref(orig_type_right);
8841
8842         if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
8843                 /* TODO: improve error message */
8844                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8845                         errorf(&expression->base.source_position,
8846                                "operation needs integer types");
8847                 }
8848                 return;
8849         }
8850
8851         /* combined instructions are tricky. We can't create an implicit cast on
8852          * the left side, because we need the uncasted form for the store.
8853          * The ast2firm pass has to know that left_type must be right_type
8854          * for the arithmetic operation and create a cast by itself */
8855         type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8856         expression->right       = create_implicit_cast(right, arithmetic_type);
8857         expression->base.type   = type_left;
8858 }
8859
8860 static void semantic_shift_assign(binary_expression_t *expression)
8861 {
8862         expression_t *left           = expression->left;
8863
8864         if (!is_valid_assignment_lhs(left))
8865                 return;
8866
8867         if (!semantic_shift(expression))
8868                 return;
8869
8870         expression->base.type = skip_typeref(left->base.type);
8871 }
8872
8873 static void warn_logical_and_within_or(const expression_t *const expr)
8874 {
8875         if (expr->base.kind != EXPR_BINARY_LOGICAL_AND)
8876                 return;
8877         if (expr->base.parenthesized)
8878                 return;
8879         warningf(&expr->base.source_position,
8880                         "suggest parentheses around && within ||");
8881 }
8882
8883 /**
8884  * Check the semantic restrictions of a logical expression.
8885  */
8886 static void semantic_logical_op(binary_expression_t *expression)
8887 {
8888         /* §6.5.13:2  Each of the operands shall have scalar type.
8889          * §6.5.14:2  Each of the operands shall have scalar type. */
8890         semantic_condition(expression->left,   "left operand of logical operator");
8891         semantic_condition(expression->right, "right operand of logical operator");
8892         if (expression->base.kind == EXPR_BINARY_LOGICAL_OR &&
8893                         warning.parentheses) {
8894                 warn_logical_and_within_or(expression->left);
8895                 warn_logical_and_within_or(expression->right);
8896         }
8897         expression->base.type = c_mode & _CXX ? type_bool : type_int;
8898 }
8899
8900 /**
8901  * Check the semantic restrictions of a binary assign expression.
8902  */
8903 static void semantic_binexpr_assign(binary_expression_t *expression)
8904 {
8905         expression_t *left           = expression->left;
8906         type_t       *orig_type_left = left->base.type;
8907
8908         if (!is_valid_assignment_lhs(left))
8909                 return;
8910
8911         assign_error_t error = semantic_assign(orig_type_left, expression->right);
8912         report_assign_error(error, orig_type_left, expression->right,
8913                         "assignment", &left->base.source_position);
8914         expression->right = create_implicit_cast(expression->right, orig_type_left);
8915         expression->base.type = orig_type_left;
8916 }
8917
8918 /**
8919  * Determine if the outermost operation (or parts thereof) of the given
8920  * expression has no effect in order to generate a warning about this fact.
8921  * Therefore in some cases this only examines some of the operands of the
8922  * expression (see comments in the function and examples below).
8923  * Examples:
8924  *   f() + 23;    // warning, because + has no effect
8925  *   x || f();    // no warning, because x controls execution of f()
8926  *   x ? y : f(); // warning, because y has no effect
8927  *   (void)x;     // no warning to be able to suppress the warning
8928  * This function can NOT be used for an "expression has definitely no effect"-
8929  * analysis. */
8930 static bool expression_has_effect(const expression_t *const expr)
8931 {
8932         switch (expr->kind) {
8933                 case EXPR_UNKNOWN:                    break;
8934                 case EXPR_INVALID:                    return true; /* do NOT warn */
8935                 case EXPR_REFERENCE:                  return false;
8936                 case EXPR_REFERENCE_ENUM_VALUE:       return false;
8937                 /* suppress the warning for microsoft __noop operations */
8938                 case EXPR_CONST:                      return expr->conste.is_ms_noop;
8939                 case EXPR_CHARACTER_CONSTANT:         return false;
8940                 case EXPR_WIDE_CHARACTER_CONSTANT:    return false;
8941                 case EXPR_STRING_LITERAL:             return false;
8942                 case EXPR_WIDE_STRING_LITERAL:        return false;
8943                 case EXPR_LABEL_ADDRESS:              return false;
8944
8945                 case EXPR_CALL: {
8946                         const call_expression_t *const call = &expr->call;
8947                         if (call->function->kind != EXPR_REFERENCE)
8948                                 return true;
8949
8950                         switch (call->function->reference.entity->function.btk) {
8951                                 /* FIXME: which builtins have no effect? */
8952                                 default:                      return true;
8953                         }
8954                 }
8955
8956                 /* Generate the warning if either the left or right hand side of a
8957                  * conditional expression has no effect */
8958                 case EXPR_CONDITIONAL: {
8959                         conditional_expression_t const *const cond = &expr->conditional;
8960                         expression_t             const *const t    = cond->true_expression;
8961                         return
8962                                 (t == NULL || expression_has_effect(t)) &&
8963                                 expression_has_effect(cond->false_expression);
8964                 }
8965
8966                 case EXPR_SELECT:                     return false;
8967                 case EXPR_ARRAY_ACCESS:               return false;
8968                 case EXPR_SIZEOF:                     return false;
8969                 case EXPR_CLASSIFY_TYPE:              return false;
8970                 case EXPR_ALIGNOF:                    return false;
8971
8972                 case EXPR_FUNCNAME:                   return false;
8973                 case EXPR_BUILTIN_CONSTANT_P:         return false;
8974                 case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return false;
8975                 case EXPR_OFFSETOF:                   return false;
8976                 case EXPR_VA_START:                   return true;
8977                 case EXPR_VA_ARG:                     return true;
8978                 case EXPR_VA_COPY:                    return true;
8979                 case EXPR_STATEMENT:                  return true; // TODO
8980                 case EXPR_COMPOUND_LITERAL:           return false;
8981
8982                 case EXPR_UNARY_NEGATE:               return false;
8983                 case EXPR_UNARY_PLUS:                 return false;
8984                 case EXPR_UNARY_BITWISE_NEGATE:       return false;
8985                 case EXPR_UNARY_NOT:                  return false;
8986                 case EXPR_UNARY_DEREFERENCE:          return false;
8987                 case EXPR_UNARY_TAKE_ADDRESS:         return false;
8988                 case EXPR_UNARY_POSTFIX_INCREMENT:    return true;
8989                 case EXPR_UNARY_POSTFIX_DECREMENT:    return true;
8990                 case EXPR_UNARY_PREFIX_INCREMENT:     return true;
8991                 case EXPR_UNARY_PREFIX_DECREMENT:     return true;
8992
8993                 /* Treat void casts as if they have an effect in order to being able to
8994                  * suppress the warning */
8995                 case EXPR_UNARY_CAST: {
8996                         type_t *const type = skip_typeref(expr->base.type);
8997                         return is_type_atomic(type, ATOMIC_TYPE_VOID);
8998                 }
8999
9000                 case EXPR_UNARY_CAST_IMPLICIT:        return true;
9001                 case EXPR_UNARY_ASSUME:               return true;
9002                 case EXPR_UNARY_DELETE:               return true;
9003                 case EXPR_UNARY_DELETE_ARRAY:         return true;
9004                 case EXPR_UNARY_THROW:                return true;
9005
9006                 case EXPR_BINARY_ADD:                 return false;
9007                 case EXPR_BINARY_SUB:                 return false;
9008                 case EXPR_BINARY_MUL:                 return false;
9009                 case EXPR_BINARY_DIV:                 return false;
9010                 case EXPR_BINARY_MOD:                 return false;
9011                 case EXPR_BINARY_EQUAL:               return false;
9012                 case EXPR_BINARY_NOTEQUAL:            return false;
9013                 case EXPR_BINARY_LESS:                return false;
9014                 case EXPR_BINARY_LESSEQUAL:           return false;
9015                 case EXPR_BINARY_GREATER:             return false;
9016                 case EXPR_BINARY_GREATEREQUAL:        return false;
9017                 case EXPR_BINARY_BITWISE_AND:         return false;
9018                 case EXPR_BINARY_BITWISE_OR:          return false;
9019                 case EXPR_BINARY_BITWISE_XOR:         return false;
9020                 case EXPR_BINARY_SHIFTLEFT:           return false;
9021                 case EXPR_BINARY_SHIFTRIGHT:          return false;
9022                 case EXPR_BINARY_ASSIGN:              return true;
9023                 case EXPR_BINARY_MUL_ASSIGN:          return true;
9024                 case EXPR_BINARY_DIV_ASSIGN:          return true;
9025                 case EXPR_BINARY_MOD_ASSIGN:          return true;
9026                 case EXPR_BINARY_ADD_ASSIGN:          return true;
9027                 case EXPR_BINARY_SUB_ASSIGN:          return true;
9028                 case EXPR_BINARY_SHIFTLEFT_ASSIGN:    return true;
9029                 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:   return true;
9030                 case EXPR_BINARY_BITWISE_AND_ASSIGN:  return true;
9031                 case EXPR_BINARY_BITWISE_XOR_ASSIGN:  return true;
9032                 case EXPR_BINARY_BITWISE_OR_ASSIGN:   return true;
9033
9034                 /* Only examine the right hand side of && and ||, because the left hand
9035                  * side already has the effect of controlling the execution of the right
9036                  * hand side */
9037                 case EXPR_BINARY_LOGICAL_AND:
9038                 case EXPR_BINARY_LOGICAL_OR:
9039                 /* Only examine the right hand side of a comma expression, because the left
9040                  * hand side has a separate warning */
9041                 case EXPR_BINARY_COMMA:
9042                         return expression_has_effect(expr->binary.right);
9043
9044                 case EXPR_BINARY_ISGREATER:           return false;
9045                 case EXPR_BINARY_ISGREATEREQUAL:      return false;
9046                 case EXPR_BINARY_ISLESS:              return false;
9047                 case EXPR_BINARY_ISLESSEQUAL:         return false;
9048                 case EXPR_BINARY_ISLESSGREATER:       return false;
9049                 case EXPR_BINARY_ISUNORDERED:         return false;
9050         }
9051
9052         internal_errorf(HERE, "unexpected expression");
9053 }
9054
9055 static void semantic_comma(binary_expression_t *expression)
9056 {
9057         if (warning.unused_value) {
9058                 const expression_t *const left = expression->left;
9059                 if (!expression_has_effect(left)) {
9060                         warningf(&left->base.source_position,
9061                                  "left-hand operand of comma expression has no effect");
9062                 }
9063         }
9064         expression->base.type = expression->right->base.type;
9065 }
9066
9067 /**
9068  * @param prec_r precedence of the right operand
9069  */
9070 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \
9071 static expression_t *parse_##binexpression_type(expression_t *left)          \
9072 {                                                                            \
9073         expression_t *binexpr = allocate_expression_zero(binexpression_type);    \
9074         binexpr->binary.left  = left;                                            \
9075         eat(token_type);                                                         \
9076                                                                              \
9077         expression_t *right = parse_sub_expression(prec_r);                      \
9078                                                                              \
9079         binexpr->binary.right = right;                                           \
9080         sfunc(&binexpr->binary);                                                 \
9081                                                                              \
9082         return binexpr;                                                          \
9083 }
9084
9085 CREATE_BINEXPR_PARSER('*',                    EXPR_BINARY_MUL,                PREC_CAST,           semantic_binexpr_arithmetic)
9086 CREATE_BINEXPR_PARSER('/',                    EXPR_BINARY_DIV,                PREC_CAST,           semantic_divmod_arithmetic)
9087 CREATE_BINEXPR_PARSER('%',                    EXPR_BINARY_MOD,                PREC_CAST,           semantic_divmod_arithmetic)
9088 CREATE_BINEXPR_PARSER('+',                    EXPR_BINARY_ADD,                PREC_MULTIPLICATIVE, semantic_add)
9089 CREATE_BINEXPR_PARSER('-',                    EXPR_BINARY_SUB,                PREC_MULTIPLICATIVE, semantic_sub)
9090 CREATE_BINEXPR_PARSER(T_LESSLESS,             EXPR_BINARY_SHIFTLEFT,          PREC_ADDITIVE,       semantic_shift_op)
9091 CREATE_BINEXPR_PARSER(T_GREATERGREATER,       EXPR_BINARY_SHIFTRIGHT,         PREC_ADDITIVE,       semantic_shift_op)
9092 CREATE_BINEXPR_PARSER('<',                    EXPR_BINARY_LESS,               PREC_SHIFT,          semantic_comparison)
9093 CREATE_BINEXPR_PARSER('>',                    EXPR_BINARY_GREATER,            PREC_SHIFT,          semantic_comparison)
9094 CREATE_BINEXPR_PARSER(T_LESSEQUAL,            EXPR_BINARY_LESSEQUAL,          PREC_SHIFT,          semantic_comparison)
9095 CREATE_BINEXPR_PARSER(T_GREATEREQUAL,         EXPR_BINARY_GREATEREQUAL,       PREC_SHIFT,          semantic_comparison)
9096 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,           PREC_RELATIONAL,     semantic_comparison)
9097 CREATE_BINEXPR_PARSER(T_EQUALEQUAL,           EXPR_BINARY_EQUAL,              PREC_RELATIONAL,     semantic_comparison)
9098 CREATE_BINEXPR_PARSER('&',                    EXPR_BINARY_BITWISE_AND,        PREC_EQUALITY,       semantic_binexpr_arithmetic)
9099 CREATE_BINEXPR_PARSER('^',                    EXPR_BINARY_BITWISE_XOR,        PREC_AND,            semantic_binexpr_arithmetic)
9100 CREATE_BINEXPR_PARSER('|',                    EXPR_BINARY_BITWISE_OR,         PREC_XOR,            semantic_binexpr_arithmetic)
9101 CREATE_BINEXPR_PARSER(T_ANDAND,               EXPR_BINARY_LOGICAL_AND,        PREC_OR,             semantic_logical_op)
9102 CREATE_BINEXPR_PARSER(T_PIPEPIPE,             EXPR_BINARY_LOGICAL_OR,         PREC_LOGICAL_AND,    semantic_logical_op)
9103 CREATE_BINEXPR_PARSER('=',                    EXPR_BINARY_ASSIGN,             PREC_ASSIGNMENT,     semantic_binexpr_assign)
9104 CREATE_BINEXPR_PARSER(T_PLUSEQUAL,            EXPR_BINARY_ADD_ASSIGN,         PREC_ASSIGNMENT,     semantic_arithmetic_addsubb_assign)
9105 CREATE_BINEXPR_PARSER(T_MINUSEQUAL,           EXPR_BINARY_SUB_ASSIGN,         PREC_ASSIGNMENT,     semantic_arithmetic_addsubb_assign)
9106 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL,        EXPR_BINARY_MUL_ASSIGN,         PREC_ASSIGNMENT,     semantic_arithmetic_assign)
9107 CREATE_BINEXPR_PARSER(T_SLASHEQUAL,           EXPR_BINARY_DIV_ASSIGN,         PREC_ASSIGNMENT,     semantic_divmod_assign)
9108 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL,         EXPR_BINARY_MOD_ASSIGN,         PREC_ASSIGNMENT,     semantic_divmod_assign)
9109 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL,        EXPR_BINARY_SHIFTLEFT_ASSIGN,   PREC_ASSIGNMENT,     semantic_shift_assign)
9110 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL,  EXPR_BINARY_SHIFTRIGHT_ASSIGN,  PREC_ASSIGNMENT,     semantic_shift_assign)
9111 CREATE_BINEXPR_PARSER(T_ANDEQUAL,             EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT,     semantic_integer_assign)
9112 CREATE_BINEXPR_PARSER(T_PIPEEQUAL,            EXPR_BINARY_BITWISE_OR_ASSIGN,  PREC_ASSIGNMENT,     semantic_integer_assign)
9113 CREATE_BINEXPR_PARSER(T_CARETEQUAL,           EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT,     semantic_integer_assign)
9114 CREATE_BINEXPR_PARSER(',',                    EXPR_BINARY_COMMA,              PREC_ASSIGNMENT,     semantic_comma)
9115
9116
9117 static expression_t *parse_sub_expression(precedence_t precedence)
9118 {
9119         if (token.type < 0) {
9120                 return expected_expression_error();
9121         }
9122
9123         expression_parser_function_t *parser
9124                 = &expression_parsers[token.type];
9125         source_position_t             source_position = token.source_position;
9126         expression_t                 *left;
9127
9128         if (parser->parser != NULL) {
9129                 left = parser->parser();
9130         } else {
9131                 left = parse_primary_expression();
9132         }
9133         assert(left != NULL);
9134         left->base.source_position = source_position;
9135
9136         while (true) {
9137                 if (token.type < 0) {
9138                         return expected_expression_error();
9139                 }
9140
9141                 parser = &expression_parsers[token.type];
9142                 if (parser->infix_parser == NULL)
9143                         break;
9144                 if (parser->infix_precedence < precedence)
9145                         break;
9146
9147                 left = parser->infix_parser(left);
9148
9149                 assert(left != NULL);
9150                 assert(left->kind != EXPR_UNKNOWN);
9151                 left->base.source_position = source_position;
9152         }
9153
9154         return left;
9155 }
9156
9157 /**
9158  * Parse an expression.
9159  */
9160 static expression_t *parse_expression(void)
9161 {
9162         return parse_sub_expression(PREC_EXPRESSION);
9163 }
9164
9165 /**
9166  * Register a parser for a prefix-like operator.
9167  *
9168  * @param parser      the parser function
9169  * @param token_type  the token type of the prefix token
9170  */
9171 static void register_expression_parser(parse_expression_function parser,
9172                                        int token_type)
9173 {
9174         expression_parser_function_t *entry = &expression_parsers[token_type];
9175
9176         if (entry->parser != NULL) {
9177                 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9178                 panic("trying to register multiple expression parsers for a token");
9179         }
9180         entry->parser = parser;
9181 }
9182
9183 /**
9184  * Register a parser for an infix operator with given precedence.
9185  *
9186  * @param parser      the parser function
9187  * @param token_type  the token type of the infix operator
9188  * @param precedence  the precedence of the operator
9189  */
9190 static void register_infix_parser(parse_expression_infix_function parser,
9191                 int token_type, precedence_t precedence)
9192 {
9193         expression_parser_function_t *entry = &expression_parsers[token_type];
9194
9195         if (entry->infix_parser != NULL) {
9196                 diagnosticf("for token '%k'\n", (token_type_t)token_type);
9197                 panic("trying to register multiple infix expression parsers for a "
9198                       "token");
9199         }
9200         entry->infix_parser     = parser;
9201         entry->infix_precedence = precedence;
9202 }
9203
9204 /**
9205  * Initialize the expression parsers.
9206  */
9207 static void init_expression_parsers(void)
9208 {
9209         memset(&expression_parsers, 0, sizeof(expression_parsers));
9210
9211         register_infix_parser(parse_array_expression,               '[',                    PREC_POSTFIX);
9212         register_infix_parser(parse_call_expression,                '(',                    PREC_POSTFIX);
9213         register_infix_parser(parse_select_expression,              '.',                    PREC_POSTFIX);
9214         register_infix_parser(parse_select_expression,              T_MINUSGREATER,         PREC_POSTFIX);
9215         register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,   T_PLUSPLUS,             PREC_POSTFIX);
9216         register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,   T_MINUSMINUS,           PREC_POSTFIX);
9217         register_infix_parser(parse_EXPR_BINARY_MUL,                '*',                    PREC_MULTIPLICATIVE);
9218         register_infix_parser(parse_EXPR_BINARY_DIV,                '/',                    PREC_MULTIPLICATIVE);
9219         register_infix_parser(parse_EXPR_BINARY_MOD,                '%',                    PREC_MULTIPLICATIVE);
9220         register_infix_parser(parse_EXPR_BINARY_ADD,                '+',                    PREC_ADDITIVE);
9221         register_infix_parser(parse_EXPR_BINARY_SUB,                '-',                    PREC_ADDITIVE);
9222         register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT,          T_LESSLESS,             PREC_SHIFT);
9223         register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT,         T_GREATERGREATER,       PREC_SHIFT);
9224         register_infix_parser(parse_EXPR_BINARY_LESS,               '<',                    PREC_RELATIONAL);
9225         register_infix_parser(parse_EXPR_BINARY_GREATER,            '>',                    PREC_RELATIONAL);
9226         register_infix_parser(parse_EXPR_BINARY_LESSEQUAL,          T_LESSEQUAL,            PREC_RELATIONAL);
9227         register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL,       T_GREATEREQUAL,         PREC_RELATIONAL);
9228         register_infix_parser(parse_EXPR_BINARY_EQUAL,              T_EQUALEQUAL,           PREC_EQUALITY);
9229         register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,           T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY);
9230         register_infix_parser(parse_EXPR_BINARY_BITWISE_AND,        '&',                    PREC_AND);
9231         register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR,        '^',                    PREC_XOR);
9232         register_infix_parser(parse_EXPR_BINARY_BITWISE_OR,         '|',                    PREC_OR);
9233         register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND,        T_ANDAND,               PREC_LOGICAL_AND);
9234         register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR,         T_PIPEPIPE,             PREC_LOGICAL_OR);
9235         register_infix_parser(parse_conditional_expression,         '?',                    PREC_CONDITIONAL);
9236         register_infix_parser(parse_EXPR_BINARY_ASSIGN,             '=',                    PREC_ASSIGNMENT);
9237         register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN,         T_PLUSEQUAL,            PREC_ASSIGNMENT);
9238         register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN,         T_MINUSEQUAL,           PREC_ASSIGNMENT);
9239         register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN,         T_ASTERISKEQUAL,        PREC_ASSIGNMENT);
9240         register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN,         T_SLASHEQUAL,           PREC_ASSIGNMENT);
9241         register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN,         T_PERCENTEQUAL,         PREC_ASSIGNMENT);
9242         register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,   T_LESSLESSEQUAL,        PREC_ASSIGNMENT);
9243         register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,  T_GREATERGREATEREQUAL,  PREC_ASSIGNMENT);
9244         register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL,             PREC_ASSIGNMENT);
9245         register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,  T_PIPEEQUAL,            PREC_ASSIGNMENT);
9246         register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL,           PREC_ASSIGNMENT);
9247         register_infix_parser(parse_EXPR_BINARY_COMMA,              ',',                    PREC_EXPRESSION);
9248
9249         register_expression_parser(parse_EXPR_UNARY_NEGATE,           '-');
9250         register_expression_parser(parse_EXPR_UNARY_PLUS,             '+');
9251         register_expression_parser(parse_EXPR_UNARY_NOT,              '!');
9252         register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE,   '~');
9253         register_expression_parser(parse_EXPR_UNARY_DEREFERENCE,      '*');
9254         register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS,     '&');
9255         register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS);
9256         register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS);
9257         register_expression_parser(parse_sizeof,                      T_sizeof);
9258         register_expression_parser(parse_alignof,                     T___alignof__);
9259         register_expression_parser(parse_extension,                   T___extension__);
9260         register_expression_parser(parse_builtin_classify_type,       T___builtin_classify_type);
9261         register_expression_parser(parse_delete,                      T_delete);
9262         register_expression_parser(parse_throw,                       T_throw);
9263 }
9264
9265 /**
9266  * Parse a asm statement arguments specification.
9267  */
9268 static asm_argument_t *parse_asm_arguments(bool is_out)
9269 {
9270         asm_argument_t  *result = NULL;
9271         asm_argument_t **anchor = &result;
9272
9273         while (token.type == T_STRING_LITERAL || token.type == '[') {
9274                 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
9275                 memset(argument, 0, sizeof(argument[0]));
9276
9277                 if (token.type == '[') {
9278                         eat('[');
9279                         if (token.type != T_IDENTIFIER) {
9280                                 parse_error_expected("while parsing asm argument",
9281                                                      T_IDENTIFIER, NULL);
9282                                 return NULL;
9283                         }
9284                         argument->symbol = token.v.symbol;
9285
9286                         expect(']', end_error);
9287                 }
9288
9289                 argument->constraints = parse_string_literals();
9290                 expect('(', end_error);
9291                 add_anchor_token(')');
9292                 expression_t *expression = parse_expression();
9293                 rem_anchor_token(')');
9294                 if (is_out) {
9295                         /* Ugly GCC stuff: Allow lvalue casts.  Skip casts, when they do not
9296                          * change size or type representation (e.g. int -> long is ok, but
9297                          * int -> float is not) */
9298                         if (expression->kind == EXPR_UNARY_CAST) {
9299                                 type_t      *const type = expression->base.type;
9300                                 type_kind_t  const kind = type->kind;
9301                                 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
9302                                         unsigned flags;
9303                                         unsigned size;
9304                                         if (kind == TYPE_ATOMIC) {
9305                                                 atomic_type_kind_t const akind = type->atomic.akind;
9306                                                 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9307                                                 size  = get_atomic_type_size(akind);
9308                                         } else {
9309                                                 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9310                                                 size  = get_atomic_type_size(get_intptr_kind());
9311                                         }
9312
9313                                         do {
9314                                                 expression_t *const value      = expression->unary.value;
9315                                                 type_t       *const value_type = value->base.type;
9316                                                 type_kind_t   const value_kind = value_type->kind;
9317
9318                                                 unsigned value_flags;
9319                                                 unsigned value_size;
9320                                                 if (value_kind == TYPE_ATOMIC) {
9321                                                         atomic_type_kind_t const value_akind = value_type->atomic.akind;
9322                                                         value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
9323                                                         value_size  = get_atomic_type_size(value_akind);
9324                                                 } else if (value_kind == TYPE_POINTER) {
9325                                                         value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
9326                                                         value_size  = get_atomic_type_size(get_intptr_kind());
9327                                                 } else {
9328                                                         break;
9329                                                 }
9330
9331                                                 if (value_flags != flags || value_size != size)
9332                                                         break;
9333
9334                                                 expression = value;
9335                                         } while (expression->kind == EXPR_UNARY_CAST);
9336                                 }
9337                         }
9338
9339                         if (!is_lvalue(expression)) {
9340                                 errorf(&expression->base.source_position,
9341                                        "asm output argument is not an lvalue");
9342                         }
9343
9344                         if (argument->constraints.begin[0] == '+')
9345                                 mark_vars_read(expression, NULL);
9346                 } else {
9347                         mark_vars_read(expression, NULL);
9348                 }
9349                 argument->expression = expression;
9350                 expect(')', end_error);
9351
9352                 set_address_taken(expression, true);
9353
9354                 *anchor = argument;
9355                 anchor  = &argument->next;
9356
9357                 if (token.type != ',')
9358                         break;
9359                 eat(',');
9360         }
9361
9362         return result;
9363 end_error:
9364         return NULL;
9365 }
9366
9367 /**
9368  * Parse a asm statement clobber specification.
9369  */
9370 static asm_clobber_t *parse_asm_clobbers(void)
9371 {
9372         asm_clobber_t *result = NULL;
9373         asm_clobber_t *last   = NULL;
9374
9375         while (token.type == T_STRING_LITERAL) {
9376                 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
9377                 clobber->clobber       = parse_string_literals();
9378
9379                 if (last != NULL) {
9380                         last->next = clobber;
9381                 } else {
9382                         result = clobber;
9383                 }
9384                 last = clobber;
9385
9386                 if (token.type != ',')
9387                         break;
9388                 eat(',');
9389         }
9390
9391         return result;
9392 }
9393
9394 /**
9395  * Parse an asm statement.
9396  */
9397 static statement_t *parse_asm_statement(void)
9398 {
9399         statement_t     *statement     = allocate_statement_zero(STATEMENT_ASM);
9400         asm_statement_t *asm_statement = &statement->asms;
9401
9402         eat(T_asm);
9403
9404         if (token.type == T_volatile) {
9405                 next_token();
9406                 asm_statement->is_volatile = true;
9407         }
9408
9409         expect('(', end_error);
9410         add_anchor_token(')');
9411         add_anchor_token(':');
9412         asm_statement->asm_text = parse_string_literals();
9413
9414         if (token.type != ':') {
9415                 rem_anchor_token(':');
9416                 goto end_of_asm;
9417         }
9418         eat(':');
9419
9420         asm_statement->outputs = parse_asm_arguments(true);
9421         if (token.type != ':') {
9422                 rem_anchor_token(':');
9423                 goto end_of_asm;
9424         }
9425         eat(':');
9426
9427         asm_statement->inputs = parse_asm_arguments(false);
9428         if (token.type != ':') {
9429                 rem_anchor_token(':');
9430                 goto end_of_asm;
9431         }
9432         rem_anchor_token(':');
9433         eat(':');
9434
9435         asm_statement->clobbers = parse_asm_clobbers();
9436
9437 end_of_asm:
9438         rem_anchor_token(')');
9439         expect(')', end_error);
9440         expect(';', end_error);
9441
9442         if (asm_statement->outputs == NULL) {
9443                 /* GCC: An 'asm' instruction without any output operands will be treated
9444                  * identically to a volatile 'asm' instruction. */
9445                 asm_statement->is_volatile = true;
9446         }
9447
9448         return statement;
9449 end_error:
9450         return create_invalid_statement();
9451 }
9452
9453 /**
9454  * Parse a case statement.
9455  */
9456 static statement_t *parse_case_statement(void)
9457 {
9458         statement_t       *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9459         source_position_t *const pos       = &statement->base.source_position;
9460
9461         eat(T_case);
9462
9463         expression_t *const expression   = parse_expression();
9464         statement->case_label.expression = expression;
9465         if (!is_constant_expression(expression)) {
9466                 /* This check does not prevent the error message in all cases of an
9467                  * prior error while parsing the expression.  At least it catches the
9468                  * common case of a mistyped enum entry. */
9469                 if (is_type_valid(skip_typeref(expression->base.type))) {
9470                         errorf(pos, "case label does not reduce to an integer constant");
9471                 }
9472                 statement->case_label.is_bad = true;
9473         } else {
9474                 long const val = fold_constant_to_int(expression);
9475                 statement->case_label.first_case = val;
9476                 statement->case_label.last_case  = val;
9477         }
9478
9479         if (GNU_MODE) {
9480                 if (token.type == T_DOTDOTDOT) {
9481                         next_token();
9482                         expression_t *const end_range   = parse_expression();
9483                         statement->case_label.end_range = end_range;
9484                         if (!is_constant_expression(end_range)) {
9485                                 /* This check does not prevent the error message in all cases of an
9486                                  * prior error while parsing the expression.  At least it catches the
9487                                  * common case of a mistyped enum entry. */
9488                                 if (is_type_valid(skip_typeref(end_range->base.type))) {
9489                                         errorf(pos, "case range does not reduce to an integer constant");
9490                                 }
9491                                 statement->case_label.is_bad = true;
9492                         } else {
9493                                 long const val = fold_constant_to_int(end_range);
9494                                 statement->case_label.last_case = val;
9495
9496                                 if (warning.other && val < statement->case_label.first_case) {
9497                                         statement->case_label.is_empty_range = true;
9498                                         warningf(pos, "empty range specified");
9499                                 }
9500                         }
9501                 }
9502         }
9503
9504         PUSH_PARENT(statement);
9505
9506         expect(':', end_error);
9507 end_error:
9508
9509         if (current_switch != NULL) {
9510                 if (! statement->case_label.is_bad) {
9511                         /* Check for duplicate case values */
9512                         case_label_statement_t *c = &statement->case_label;
9513                         for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
9514                                 if (l->is_bad || l->is_empty_range || l->expression == NULL)
9515                                         continue;
9516
9517                                 if (c->last_case < l->first_case || c->first_case > l->last_case)
9518                                         continue;
9519
9520                                 errorf(pos, "duplicate case value (previously used %P)",
9521                                        &l->base.source_position);
9522                                 break;
9523                         }
9524                 }
9525                 /* link all cases into the switch statement */
9526                 if (current_switch->last_case == NULL) {
9527                         current_switch->first_case      = &statement->case_label;
9528                 } else {
9529                         current_switch->last_case->next = &statement->case_label;
9530                 }
9531                 current_switch->last_case = &statement->case_label;
9532         } else {
9533                 errorf(pos, "case label not within a switch statement");
9534         }
9535
9536         statement_t *const inner_stmt = parse_statement();
9537         statement->case_label.statement = inner_stmt;
9538         if (inner_stmt->kind == STATEMENT_DECLARATION) {
9539                 errorf(&inner_stmt->base.source_position, "declaration after case label");
9540         }
9541
9542         POP_PARENT;
9543         return statement;
9544 }
9545
9546 /**
9547  * Parse a default statement.
9548  */
9549 static statement_t *parse_default_statement(void)
9550 {
9551         statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
9552
9553         eat(T_default);
9554
9555         PUSH_PARENT(statement);
9556
9557         expect(':', end_error);
9558         if (current_switch != NULL) {
9559                 const case_label_statement_t *def_label = current_switch->default_label;
9560                 if (def_label != NULL) {
9561                         errorf(HERE, "multiple default labels in one switch (previous declared %P)",
9562                                &def_label->base.source_position);
9563                 } else {
9564                         current_switch->default_label = &statement->case_label;
9565
9566                         /* link all cases into the switch statement */
9567                         if (current_switch->last_case == NULL) {
9568                                 current_switch->first_case      = &statement->case_label;
9569                         } else {
9570                                 current_switch->last_case->next = &statement->case_label;
9571                         }
9572                         current_switch->last_case = &statement->case_label;
9573                 }
9574         } else {
9575                 errorf(&statement->base.source_position,
9576                         "'default' label not within a switch statement");
9577         }
9578
9579         statement_t *const inner_stmt = parse_statement();
9580         statement->case_label.statement = inner_stmt;
9581         if (inner_stmt->kind == STATEMENT_DECLARATION) {
9582                 errorf(&inner_stmt->base.source_position, "declaration after default label");
9583         }
9584
9585         POP_PARENT;
9586         return statement;
9587 end_error:
9588         POP_PARENT;
9589         return create_invalid_statement();
9590 }
9591
9592 /**
9593  * Parse a label statement.
9594  */
9595 static statement_t *parse_label_statement(void)
9596 {
9597         assert(token.type == T_IDENTIFIER);
9598         symbol_t *symbol = token.v.symbol;
9599         label_t  *label  = get_label(symbol);
9600
9601         statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
9602         statement->label.label       = label;
9603
9604         next_token();
9605
9606         PUSH_PARENT(statement);
9607
9608         /* if statement is already set then the label is defined twice,
9609          * otherwise it was just mentioned in a goto/local label declaration so far
9610          */
9611         if (label->statement != NULL) {
9612                 errorf(HERE, "duplicate label '%Y' (declared %P)",
9613                        symbol, &label->base.source_position);
9614         } else {
9615                 label->base.source_position = token.source_position;
9616                 label->statement            = statement;
9617         }
9618
9619         eat(':');
9620
9621         if (token.type == '}') {
9622                 /* TODO only warn? */
9623                 if (warning.other && false) {
9624                         warningf(HERE, "label at end of compound statement");
9625                         statement->label.statement = create_empty_statement();
9626                 } else {
9627                         errorf(HERE, "label at end of compound statement");
9628                         statement->label.statement = create_invalid_statement();
9629                 }
9630         } else if (token.type == ';') {
9631                 /* Eat an empty statement here, to avoid the warning about an empty
9632                  * statement after a label.  label:; is commonly used to have a label
9633                  * before a closing brace. */
9634                 statement->label.statement = create_empty_statement();
9635                 next_token();
9636         } else {
9637                 statement_t *const inner_stmt = parse_statement();
9638                 statement->label.statement = inner_stmt;
9639                 if (inner_stmt->kind == STATEMENT_DECLARATION) {
9640                         errorf(&inner_stmt->base.source_position, "declaration after label");
9641                 }
9642         }
9643
9644         /* remember the labels in a list for later checking */
9645         *label_anchor = &statement->label;
9646         label_anchor  = &statement->label.next;
9647
9648         POP_PARENT;
9649         return statement;
9650 }
9651
9652 /**
9653  * Parse an if statement.
9654  */
9655 static statement_t *parse_if(void)
9656 {
9657         statement_t *statement = allocate_statement_zero(STATEMENT_IF);
9658
9659         eat(T_if);
9660
9661         PUSH_PARENT(statement);
9662
9663         add_anchor_token('{');
9664
9665         expect('(', end_error);
9666         add_anchor_token(')');
9667         expression_t *const expr = parse_expression();
9668         statement->ifs.condition = expr;
9669         /* §6.8.4.1:1  The controlling expression of an if statement shall have
9670          *             scalar type. */
9671         semantic_condition(expr, "condition of 'if'-statment");
9672         mark_vars_read(expr, NULL);
9673         rem_anchor_token(')');
9674         expect(')', end_error);
9675
9676 end_error:
9677         rem_anchor_token('{');
9678
9679         add_anchor_token(T_else);
9680         statement_t *const true_stmt = parse_statement();
9681         statement->ifs.true_statement = true_stmt;
9682         rem_anchor_token(T_else);
9683
9684         if (token.type == T_else) {
9685                 next_token();
9686                 statement->ifs.false_statement = parse_statement();
9687         } else if (warning.parentheses &&
9688                         true_stmt->kind == STATEMENT_IF &&
9689                         true_stmt->ifs.false_statement != NULL) {
9690                 warningf(&true_stmt->base.source_position,
9691                                 "suggest explicit braces to avoid ambiguous 'else'");
9692         }
9693
9694         POP_PARENT;
9695         return statement;
9696 }
9697
9698 /**
9699  * Check that all enums are handled in a switch.
9700  *
9701  * @param statement  the switch statement to check
9702  */
9703 static void check_enum_cases(const switch_statement_t *statement)
9704 {
9705         const type_t *type = skip_typeref(statement->expression->base.type);
9706         if (! is_type_enum(type))
9707                 return;
9708         const enum_type_t *enumt = &type->enumt;
9709
9710         /* if we have a default, no warnings */
9711         if (statement->default_label != NULL)
9712                 return;
9713
9714         /* FIXME: calculation of value should be done while parsing */
9715         /* TODO: quadratic algorithm here. Change to an n log n one */
9716         long            last_value = -1;
9717         const entity_t *entry      = enumt->enume->base.next;
9718         for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
9719              entry = entry->base.next) {
9720                 const expression_t *expression = entry->enum_value.value;
9721                 long                value      = expression != NULL ? fold_constant_to_int(expression) : last_value + 1;
9722                 bool                found      = false;
9723                 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
9724                         if (l->expression == NULL)
9725                                 continue;
9726                         if (l->first_case <= value && value <= l->last_case) {
9727                                 found = true;
9728                                 break;
9729                         }
9730                 }
9731                 if (! found) {
9732                         warningf(&statement->base.source_position,
9733                                  "enumeration value '%Y' not handled in switch",
9734                                  entry->base.symbol);
9735                 }
9736                 last_value = value;
9737         }
9738 }
9739
9740 /**
9741  * Parse a switch statement.
9742  */
9743 static statement_t *parse_switch(void)
9744 {
9745         statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
9746
9747         eat(T_switch);
9748
9749         PUSH_PARENT(statement);
9750
9751         expect('(', end_error);
9752         add_anchor_token(')');
9753         expression_t *const expr = parse_expression();
9754         mark_vars_read(expr, NULL);
9755         type_t       *      type = skip_typeref(expr->base.type);
9756         if (is_type_integer(type)) {
9757                 type = promote_integer(type);
9758                 if (warning.traditional) {
9759                         if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
9760                                 warningf(&expr->base.source_position,
9761                                         "'%T' switch expression not converted to '%T' in ISO C",
9762                                         type, type_int);
9763                         }
9764                 }
9765         } else if (is_type_valid(type)) {
9766                 errorf(&expr->base.source_position,
9767                        "switch quantity is not an integer, but '%T'", type);
9768                 type = type_error_type;
9769         }
9770         statement->switchs.expression = create_implicit_cast(expr, type);
9771         expect(')', end_error);
9772         rem_anchor_token(')');
9773
9774         switch_statement_t *rem = current_switch;
9775         current_switch          = &statement->switchs;
9776         statement->switchs.body = parse_statement();
9777         current_switch          = rem;
9778
9779         if (warning.switch_default &&
9780             statement->switchs.default_label == NULL) {
9781                 warningf(&statement->base.source_position, "switch has no default case");
9782         }
9783         if (warning.switch_enum)
9784                 check_enum_cases(&statement->switchs);
9785
9786         POP_PARENT;
9787         return statement;
9788 end_error:
9789         POP_PARENT;
9790         return create_invalid_statement();
9791 }
9792
9793 static statement_t *parse_loop_body(statement_t *const loop)
9794 {
9795         statement_t *const rem = current_loop;
9796         current_loop = loop;
9797
9798         statement_t *const body = parse_statement();
9799
9800         current_loop = rem;
9801         return body;
9802 }
9803
9804 /**
9805  * Parse a while statement.
9806  */
9807 static statement_t *parse_while(void)
9808 {
9809         statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
9810
9811         eat(T_while);
9812
9813         PUSH_PARENT(statement);
9814
9815         expect('(', end_error);
9816         add_anchor_token(')');
9817         expression_t *const cond = parse_expression();
9818         statement->whiles.condition = cond;
9819         /* §6.8.5:2    The controlling expression of an iteration statement shall
9820          *             have scalar type. */
9821         semantic_condition(cond, "condition of 'while'-statement");
9822         mark_vars_read(cond, NULL);
9823         rem_anchor_token(')');
9824         expect(')', end_error);
9825
9826         statement->whiles.body = parse_loop_body(statement);
9827
9828         POP_PARENT;
9829         return statement;
9830 end_error:
9831         POP_PARENT;
9832         return create_invalid_statement();
9833 }
9834
9835 /**
9836  * Parse a do statement.
9837  */
9838 static statement_t *parse_do(void)
9839 {
9840         statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
9841
9842         eat(T_do);
9843
9844         PUSH_PARENT(statement);
9845
9846         add_anchor_token(T_while);
9847         statement->do_while.body = parse_loop_body(statement);
9848         rem_anchor_token(T_while);
9849
9850         expect(T_while, end_error);
9851         expect('(', end_error);
9852         add_anchor_token(')');
9853         expression_t *const cond = parse_expression();
9854         statement->do_while.condition = cond;
9855         /* §6.8.5:2    The controlling expression of an iteration statement shall
9856          *             have scalar type. */
9857         semantic_condition(cond, "condition of 'do-while'-statement");
9858         mark_vars_read(cond, NULL);
9859         rem_anchor_token(')');
9860         expect(')', end_error);
9861         expect(';', end_error);
9862
9863         POP_PARENT;
9864         return statement;
9865 end_error:
9866         POP_PARENT;
9867         return create_invalid_statement();
9868 }
9869
9870 /**
9871  * Parse a for statement.
9872  */
9873 static statement_t *parse_for(void)
9874 {
9875         statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
9876
9877         eat(T_for);
9878
9879         expect('(', end_error1);
9880         add_anchor_token(')');
9881
9882         PUSH_PARENT(statement);
9883
9884         size_t const  top       = environment_top();
9885         scope_t      *old_scope = scope_push(&statement->fors.scope);
9886
9887         bool old_gcc_extension = in_gcc_extension;
9888         while (token.type == T___extension__) {
9889                 next_token();
9890                 in_gcc_extension = true;
9891         }
9892
9893         if (token.type == ';') {
9894                 next_token();
9895         } else if (is_declaration_specifier(&token, false)) {
9896                 parse_declaration(record_entity, DECL_FLAGS_NONE);
9897         } else {
9898                 add_anchor_token(';');
9899                 expression_t *const init = parse_expression();
9900                 statement->fors.initialisation = init;
9901                 mark_vars_read(init, ENT_ANY);
9902                 if (warning.unused_value && !expression_has_effect(init)) {
9903                         warningf(&init->base.source_position,
9904                                         "initialisation of 'for'-statement has no effect");
9905                 }
9906                 rem_anchor_token(';');
9907                 expect(';', end_error2);
9908         }
9909         in_gcc_extension = old_gcc_extension;
9910
9911         if (token.type != ';') {
9912                 add_anchor_token(';');
9913                 expression_t *const cond = parse_expression();
9914                 statement->fors.condition = cond;
9915                 /* §6.8.5:2    The controlling expression of an iteration statement
9916                  *             shall have scalar type. */
9917                 semantic_condition(cond, "condition of 'for'-statement");
9918                 mark_vars_read(cond, NULL);
9919                 rem_anchor_token(';');
9920         }
9921         expect(';', end_error2);
9922         if (token.type != ')') {
9923                 expression_t *const step = parse_expression();
9924                 statement->fors.step = step;
9925                 mark_vars_read(step, ENT_ANY);
9926                 if (warning.unused_value && !expression_has_effect(step)) {
9927                         warningf(&step->base.source_position,
9928                                  "step of 'for'-statement has no effect");
9929                 }
9930         }
9931         expect(')', end_error2);
9932         rem_anchor_token(')');
9933         statement->fors.body = parse_loop_body(statement);
9934
9935         assert(current_scope == &statement->fors.scope);
9936         scope_pop(old_scope);
9937         environment_pop_to(top);
9938
9939         POP_PARENT;
9940         return statement;
9941
9942 end_error2:
9943         POP_PARENT;
9944         rem_anchor_token(')');
9945         assert(current_scope == &statement->fors.scope);
9946         scope_pop(old_scope);
9947         environment_pop_to(top);
9948         /* fallthrough */
9949
9950 end_error1:
9951         return create_invalid_statement();
9952 }
9953
9954 /**
9955  * Parse a goto statement.
9956  */
9957 static statement_t *parse_goto(void)
9958 {
9959         statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
9960         eat(T_goto);
9961
9962         if (GNU_MODE && token.type == '*') {
9963                 next_token();
9964                 expression_t *expression = parse_expression();
9965                 mark_vars_read(expression, NULL);
9966
9967                 /* Argh: although documentation says the expression must be of type void*,
9968                  * gcc accepts anything that can be casted into void* without error */
9969                 type_t *type = expression->base.type;
9970
9971                 if (type != type_error_type) {
9972                         if (!is_type_pointer(type) && !is_type_integer(type)) {
9973                                 errorf(&expression->base.source_position,
9974                                         "cannot convert to a pointer type");
9975                         } else if (warning.other && type != type_void_ptr) {
9976                                 warningf(&expression->base.source_position,
9977                                         "type of computed goto expression should be 'void*' not '%T'", type);
9978                         }
9979                         expression = create_implicit_cast(expression, type_void_ptr);
9980                 }
9981
9982                 statement->gotos.expression = expression;
9983         } else if (token.type == T_IDENTIFIER) {
9984                 symbol_t *symbol = token.v.symbol;
9985                 next_token();
9986                 statement->gotos.label = get_label(symbol);
9987         } else {
9988                 if (GNU_MODE)
9989                         parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
9990                 else
9991                         parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
9992                 eat_until_anchor();
9993                 goto end_error;
9994         }
9995
9996         /* remember the goto's in a list for later checking */
9997         *goto_anchor = &statement->gotos;
9998         goto_anchor  = &statement->gotos.next;
9999
10000         expect(';', end_error);
10001
10002         return statement;
10003 end_error:
10004         return create_invalid_statement();
10005 }
10006
10007 /**
10008  * Parse a continue statement.
10009  */
10010 static statement_t *parse_continue(void)
10011 {
10012         if (current_loop == NULL) {
10013                 errorf(HERE, "continue statement not within loop");
10014         }
10015
10016         statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
10017
10018         eat(T_continue);
10019         expect(';', end_error);
10020
10021 end_error:
10022         return statement;
10023 }
10024
10025 /**
10026  * Parse a break statement.
10027  */
10028 static statement_t *parse_break(void)
10029 {
10030         if (current_switch == NULL && current_loop == NULL) {
10031                 errorf(HERE, "break statement not within loop or switch");
10032         }
10033
10034         statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
10035
10036         eat(T_break);
10037         expect(';', end_error);
10038
10039 end_error:
10040         return statement;
10041 }
10042
10043 /**
10044  * Parse a __leave statement.
10045  */
10046 static statement_t *parse_leave_statement(void)
10047 {
10048         if (current_try == NULL) {
10049                 errorf(HERE, "__leave statement not within __try");
10050         }
10051
10052         statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
10053
10054         eat(T___leave);
10055         expect(';', end_error);
10056
10057 end_error:
10058         return statement;
10059 }
10060
10061 /**
10062  * Check if a given entity represents a local variable.
10063  */
10064 static bool is_local_variable(const entity_t *entity)
10065 {
10066         if (entity->kind != ENTITY_VARIABLE)
10067                 return false;
10068
10069         switch ((storage_class_tag_t) entity->declaration.storage_class) {
10070         case STORAGE_CLASS_AUTO:
10071         case STORAGE_CLASS_REGISTER: {
10072                 const type_t *type = skip_typeref(entity->declaration.type);
10073                 if (is_type_function(type)) {
10074                         return false;
10075                 } else {
10076                         return true;
10077                 }
10078         }
10079         default:
10080                 return false;
10081         }
10082 }
10083
10084 /**
10085  * Check if a given expression represents a local variable.
10086  */
10087 static bool expression_is_local_variable(const expression_t *expression)
10088 {
10089         if (expression->base.kind != EXPR_REFERENCE) {
10090                 return false;
10091         }
10092         const entity_t *entity = expression->reference.entity;
10093         return is_local_variable(entity);
10094 }
10095
10096 /**
10097  * Check if a given expression represents a local variable and
10098  * return its declaration then, else return NULL.
10099  */
10100 entity_t *expression_is_variable(const expression_t *expression)
10101 {
10102         if (expression->base.kind != EXPR_REFERENCE) {
10103                 return NULL;
10104         }
10105         entity_t *entity = expression->reference.entity;
10106         if (entity->kind != ENTITY_VARIABLE)
10107                 return NULL;
10108
10109         return entity;
10110 }
10111
10112 /**
10113  * Parse a return statement.
10114  */
10115 static statement_t *parse_return(void)
10116 {
10117         eat(T_return);
10118
10119         statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
10120
10121         expression_t *return_value = NULL;
10122         if (token.type != ';') {
10123                 return_value = parse_expression();
10124                 mark_vars_read(return_value, NULL);
10125         }
10126
10127         const type_t *const func_type = skip_typeref(current_function->base.type);
10128         assert(is_type_function(func_type));
10129         type_t *const return_type = skip_typeref(func_type->function.return_type);
10130
10131         source_position_t const *const pos = &statement->base.source_position;
10132         if (return_value != NULL) {
10133                 type_t *return_value_type = skip_typeref(return_value->base.type);
10134
10135                 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10136                         if (is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
10137                                 /* ISO/IEC 14882:1998(E) §6.6.3:2 */
10138                                 /* Only warn in C mode, because GCC does the same */
10139                                 if (c_mode & _CXX || strict_mode) {
10140                                         errorf(pos,
10141                                                         "'return' with a value, in function returning 'void'");
10142                                 } else if (warning.other) {
10143                                         warningf(pos,
10144                                                         "'return' with a value, in function returning 'void'");
10145                                 }
10146                         } else if (!(c_mode & _CXX)) { /* ISO/IEC 14882:1998(E) §6.6.3:3 */
10147                                 /* Only warn in C mode, because GCC does the same */
10148                                 if (strict_mode) {
10149                                         errorf(pos,
10150                                                         "'return' with expression in function returning 'void'");
10151                                 } else if (warning.other) {
10152                                         warningf(pos,
10153                                                         "'return' with expression in function returning 'void'");
10154                                 }
10155                         }
10156                 } else {
10157                         assign_error_t error = semantic_assign(return_type, return_value);
10158                         report_assign_error(error, return_type, return_value, "'return'",
10159                                         pos);
10160                 }
10161                 return_value = create_implicit_cast(return_value, return_type);
10162                 /* check for returning address of a local var */
10163                 if (warning.other && return_value != NULL
10164                                 && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
10165                         const expression_t *expression = return_value->unary.value;
10166                         if (expression_is_local_variable(expression)) {
10167                                 warningf(pos, "function returns address of local variable");
10168                         }
10169                 }
10170         } else if (warning.other && !is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
10171                 /* ISO/IEC 14882:1998(E) §6.6.3:3 */
10172                 if (c_mode & _CXX || strict_mode) {
10173                         errorf(pos,
10174                                         "'return' without value, in function returning non-void");
10175                 } else {
10176                         warningf(pos,
10177                                         "'return' without value, in function returning non-void");
10178                 }
10179         }
10180         statement->returns.value = return_value;
10181
10182         expect(';', end_error);
10183
10184 end_error:
10185         return statement;
10186 }
10187
10188 /**
10189  * Parse a declaration statement.
10190  */
10191 static statement_t *parse_declaration_statement(void)
10192 {
10193         statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10194
10195         entity_t *before = current_scope->last_entity;
10196         if (GNU_MODE) {
10197                 parse_external_declaration();
10198         } else {
10199                 parse_declaration(record_entity, DECL_FLAGS_NONE);
10200         }
10201
10202         declaration_statement_t *const decl  = &statement->declaration;
10203         entity_t                *const begin =
10204                 before != NULL ? before->base.next : current_scope->entities;
10205         decl->declarations_begin = begin;
10206         decl->declarations_end   = begin != NULL ? current_scope->last_entity : NULL;
10207
10208         return statement;
10209 }
10210
10211 /**
10212  * Parse an expression statement, ie. expr ';'.
10213  */
10214 static statement_t *parse_expression_statement(void)
10215 {
10216         statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
10217
10218         expression_t *const expr         = parse_expression();
10219         statement->expression.expression = expr;
10220         mark_vars_read(expr, ENT_ANY);
10221
10222         expect(';', end_error);
10223
10224 end_error:
10225         return statement;
10226 }
10227
10228 /**
10229  * Parse a microsoft __try { } __finally { } or
10230  * __try{ } __except() { }
10231  */
10232 static statement_t *parse_ms_try_statment(void)
10233 {
10234         statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
10235         eat(T___try);
10236
10237         PUSH_PARENT(statement);
10238
10239         ms_try_statement_t *rem = current_try;
10240         current_try = &statement->ms_try;
10241         statement->ms_try.try_statement = parse_compound_statement(false);
10242         current_try = rem;
10243
10244         POP_PARENT;
10245
10246         if (token.type == T___except) {
10247                 eat(T___except);
10248                 expect('(', end_error);
10249                 add_anchor_token(')');
10250                 expression_t *const expr = parse_expression();
10251                 mark_vars_read(expr, NULL);
10252                 type_t       *      type = skip_typeref(expr->base.type);
10253                 if (is_type_integer(type)) {
10254                         type = promote_integer(type);
10255                 } else if (is_type_valid(type)) {
10256                         errorf(&expr->base.source_position,
10257                                "__expect expression is not an integer, but '%T'", type);
10258                         type = type_error_type;
10259                 }
10260                 statement->ms_try.except_expression = create_implicit_cast(expr, type);
10261                 rem_anchor_token(')');
10262                 expect(')', end_error);
10263                 statement->ms_try.final_statement = parse_compound_statement(false);
10264         } else if (token.type == T__finally) {
10265                 eat(T___finally);
10266                 statement->ms_try.final_statement = parse_compound_statement(false);
10267         } else {
10268                 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
10269                 return create_invalid_statement();
10270         }
10271         return statement;
10272 end_error:
10273         return create_invalid_statement();
10274 }
10275
10276 static statement_t *parse_empty_statement(void)
10277 {
10278         if (warning.empty_statement) {
10279                 warningf(HERE, "statement is empty");
10280         }
10281         statement_t *const statement = create_empty_statement();
10282         eat(';');
10283         return statement;
10284 }
10285
10286 static statement_t *parse_local_label_declaration(void)
10287 {
10288         statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
10289
10290         eat(T___label__);
10291
10292         entity_t *begin = NULL, *end = NULL;
10293
10294         while (true) {
10295                 if (token.type != T_IDENTIFIER) {
10296                         parse_error_expected("while parsing local label declaration",
10297                                 T_IDENTIFIER, NULL);
10298                         goto end_error;
10299                 }
10300                 symbol_t *symbol = token.v.symbol;
10301                 entity_t *entity = get_entity(symbol, NAMESPACE_LABEL);
10302                 if (entity != NULL && entity->base.parent_scope == current_scope) {
10303                         errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition %P)",
10304                                symbol, &entity->base.source_position);
10305                 } else {
10306                         entity = allocate_entity_zero(ENTITY_LOCAL_LABEL);
10307
10308                         entity->base.parent_scope    = current_scope;
10309                         entity->base.namespc         = NAMESPACE_LABEL;
10310                         entity->base.source_position = token.source_position;
10311                         entity->base.symbol          = symbol;
10312
10313                         if (end != NULL)
10314                                 end->base.next = entity;
10315                         end = entity;
10316                         if (begin == NULL)
10317                                 begin = entity;
10318
10319                         environment_push(entity);
10320                 }
10321                 next_token();
10322
10323                 if (token.type != ',')
10324                         break;
10325                 next_token();
10326         }
10327         eat(';');
10328 end_error:
10329         statement->declaration.declarations_begin = begin;
10330         statement->declaration.declarations_end   = end;
10331         return statement;
10332 }
10333
10334 static void parse_namespace_definition(void)
10335 {
10336         eat(T_namespace);
10337
10338         entity_t *entity = NULL;
10339         symbol_t *symbol = NULL;
10340
10341         if (token.type == T_IDENTIFIER) {
10342                 symbol = token.v.symbol;
10343                 next_token();
10344
10345                 entity = get_entity(symbol, NAMESPACE_NORMAL);
10346                 if (entity       != NULL             &&
10347                                 entity->kind != ENTITY_NAMESPACE &&
10348                                 entity->base.parent_scope == current_scope) {
10349                         if (!is_error_entity(entity)) {
10350                                 error_redefined_as_different_kind(&token.source_position,
10351                                                 entity, ENTITY_NAMESPACE);
10352                         }
10353                         entity = NULL;
10354                 }
10355         }
10356
10357         if (entity == NULL) {
10358                 entity                       = allocate_entity_zero(ENTITY_NAMESPACE);
10359                 entity->base.symbol          = symbol;
10360                 entity->base.source_position = token.source_position;
10361                 entity->base.namespc         = NAMESPACE_NORMAL;
10362                 entity->base.parent_scope    = current_scope;
10363         }
10364
10365         if (token.type == '=') {
10366                 /* TODO: parse namespace alias */
10367                 panic("namespace alias definition not supported yet");
10368         }
10369
10370         environment_push(entity);
10371         append_entity(current_scope, entity);
10372
10373         size_t const  top       = environment_top();
10374         scope_t      *old_scope = scope_push(&entity->namespacee.members);
10375
10376         expect('{', end_error);
10377         parse_externals();
10378         expect('}', end_error);
10379
10380 end_error:
10381         assert(current_scope == &entity->namespacee.members);
10382         scope_pop(old_scope);
10383         environment_pop_to(top);
10384 }
10385
10386 /**
10387  * Parse a statement.
10388  * There's also parse_statement() which additionally checks for
10389  * "statement has no effect" warnings
10390  */
10391 static statement_t *intern_parse_statement(void)
10392 {
10393         statement_t *statement = NULL;
10394
10395         /* declaration or statement */
10396         add_anchor_token(';');
10397         switch (token.type) {
10398         case T_IDENTIFIER: {
10399                 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
10400                 if (la1_type == ':') {
10401                         statement = parse_label_statement();
10402                 } else if (is_typedef_symbol(token.v.symbol)) {
10403                         statement = parse_declaration_statement();
10404                 } else {
10405                         /* it's an identifier, the grammar says this must be an
10406                          * expression statement. However it is common that users mistype
10407                          * declaration types, so we guess a bit here to improve robustness
10408                          * for incorrect programs */
10409                         switch (la1_type) {
10410                         case '&':
10411                         case '*':
10412                                 if (get_entity(token.v.symbol, NAMESPACE_NORMAL) != NULL)
10413                                         goto expression_statment;
10414                                 /* FALLTHROUGH */
10415
10416                         DECLARATION_START
10417                         case T_IDENTIFIER:
10418                                 statement = parse_declaration_statement();
10419                                 break;
10420
10421                         default:
10422 expression_statment:
10423                                 statement = parse_expression_statement();
10424                                 break;
10425                         }
10426                 }
10427                 break;
10428         }
10429
10430         case T___extension__:
10431                 /* This can be a prefix to a declaration or an expression statement.
10432                  * We simply eat it now and parse the rest with tail recursion. */
10433                 do {
10434                         next_token();
10435                 } while (token.type == T___extension__);
10436                 bool old_gcc_extension = in_gcc_extension;
10437                 in_gcc_extension       = true;
10438                 statement = intern_parse_statement();
10439                 in_gcc_extension = old_gcc_extension;
10440                 break;
10441
10442         DECLARATION_START
10443                 statement = parse_declaration_statement();
10444                 break;
10445
10446         case T___label__:
10447                 statement = parse_local_label_declaration();
10448                 break;
10449
10450         case ';':         statement = parse_empty_statement();         break;
10451         case '{':         statement = parse_compound_statement(false); break;
10452         case T___leave:   statement = parse_leave_statement();         break;
10453         case T___try:     statement = parse_ms_try_statment();         break;
10454         case T_asm:       statement = parse_asm_statement();           break;
10455         case T_break:     statement = parse_break();                   break;
10456         case T_case:      statement = parse_case_statement();          break;
10457         case T_continue:  statement = parse_continue();                break;
10458         case T_default:   statement = parse_default_statement();       break;
10459         case T_do:        statement = parse_do();                      break;
10460         case T_for:       statement = parse_for();                     break;
10461         case T_goto:      statement = parse_goto();                    break;
10462         case T_if:        statement = parse_if();                      break;
10463         case T_return:    statement = parse_return();                  break;
10464         case T_switch:    statement = parse_switch();                  break;
10465         case T_while:     statement = parse_while();                   break;
10466
10467         EXPRESSION_START
10468                 statement = parse_expression_statement();
10469                 break;
10470
10471         default:
10472                 errorf(HERE, "unexpected token %K while parsing statement", &token);
10473                 statement = create_invalid_statement();
10474                 if (!at_anchor())
10475                         next_token();
10476                 break;
10477         }
10478         rem_anchor_token(';');
10479
10480         assert(statement != NULL
10481                         && statement->base.source_position.input_name != NULL);
10482
10483         return statement;
10484 }
10485
10486 /**
10487  * parse a statement and emits "statement has no effect" warning if needed
10488  * (This is really a wrapper around intern_parse_statement with check for 1
10489  *  single warning. It is needed, because for statement expressions we have
10490  *  to avoid the warning on the last statement)
10491  */
10492 static statement_t *parse_statement(void)
10493 {
10494         statement_t *statement = intern_parse_statement();
10495
10496         if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
10497                 expression_t *expression = statement->expression.expression;
10498                 if (!expression_has_effect(expression)) {
10499                         warningf(&expression->base.source_position,
10500                                         "statement has no effect");
10501                 }
10502         }
10503
10504         return statement;
10505 }
10506
10507 /**
10508  * Parse a compound statement.
10509  */
10510 static statement_t *parse_compound_statement(bool inside_expression_statement)
10511 {
10512         statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
10513
10514         PUSH_PARENT(statement);
10515
10516         eat('{');
10517         add_anchor_token('}');
10518         /* tokens, which can start a statement */
10519         /* TODO MS, __builtin_FOO */
10520         add_anchor_token('!');
10521         add_anchor_token('&');
10522         add_anchor_token('(');
10523         add_anchor_token('*');
10524         add_anchor_token('+');
10525         add_anchor_token('-');
10526         add_anchor_token('{');
10527         add_anchor_token('~');
10528         add_anchor_token(T_CHARACTER_CONSTANT);
10529         add_anchor_token(T_COLONCOLON);
10530         add_anchor_token(T_FLOATINGPOINT);
10531         add_anchor_token(T_IDENTIFIER);
10532         add_anchor_token(T_INTEGER);
10533         add_anchor_token(T_MINUSMINUS);
10534         add_anchor_token(T_PLUSPLUS);
10535         add_anchor_token(T_STRING_LITERAL);
10536         add_anchor_token(T_WIDE_CHARACTER_CONSTANT);
10537         add_anchor_token(T_WIDE_STRING_LITERAL);
10538         add_anchor_token(T__Bool);
10539         add_anchor_token(T__Complex);
10540         add_anchor_token(T__Imaginary);
10541         add_anchor_token(T___FUNCTION__);
10542         add_anchor_token(T___PRETTY_FUNCTION__);
10543         add_anchor_token(T___alignof__);
10544         add_anchor_token(T___attribute__);
10545         add_anchor_token(T___builtin_va_start);
10546         add_anchor_token(T___extension__);
10547         add_anchor_token(T___func__);
10548         add_anchor_token(T___imag__);
10549         add_anchor_token(T___label__);
10550         add_anchor_token(T___real__);
10551         add_anchor_token(T___thread);
10552         add_anchor_token(T_asm);
10553         add_anchor_token(T_auto);
10554         add_anchor_token(T_bool);
10555         add_anchor_token(T_break);
10556         add_anchor_token(T_case);
10557         add_anchor_token(T_char);
10558         add_anchor_token(T_class);
10559         add_anchor_token(T_const);
10560         add_anchor_token(T_const_cast);
10561         add_anchor_token(T_continue);
10562         add_anchor_token(T_default);
10563         add_anchor_token(T_delete);
10564         add_anchor_token(T_double);
10565         add_anchor_token(T_do);
10566         add_anchor_token(T_dynamic_cast);
10567         add_anchor_token(T_enum);
10568         add_anchor_token(T_extern);
10569         add_anchor_token(T_false);
10570         add_anchor_token(T_float);
10571         add_anchor_token(T_for);
10572         add_anchor_token(T_goto);
10573         add_anchor_token(T_if);
10574         add_anchor_token(T_inline);
10575         add_anchor_token(T_int);
10576         add_anchor_token(T_long);
10577         add_anchor_token(T_new);
10578         add_anchor_token(T_operator);
10579         add_anchor_token(T_register);
10580         add_anchor_token(T_reinterpret_cast);
10581         add_anchor_token(T_restrict);
10582         add_anchor_token(T_return);
10583         add_anchor_token(T_short);
10584         add_anchor_token(T_signed);
10585         add_anchor_token(T_sizeof);
10586         add_anchor_token(T_static);
10587         add_anchor_token(T_static_cast);
10588         add_anchor_token(T_struct);
10589         add_anchor_token(T_switch);
10590         add_anchor_token(T_template);
10591         add_anchor_token(T_this);
10592         add_anchor_token(T_throw);
10593         add_anchor_token(T_true);
10594         add_anchor_token(T_try);
10595         add_anchor_token(T_typedef);
10596         add_anchor_token(T_typeid);
10597         add_anchor_token(T_typename);
10598         add_anchor_token(T_typeof);
10599         add_anchor_token(T_union);
10600         add_anchor_token(T_unsigned);
10601         add_anchor_token(T_using);
10602         add_anchor_token(T_void);
10603         add_anchor_token(T_volatile);
10604         add_anchor_token(T_wchar_t);
10605         add_anchor_token(T_while);
10606
10607         size_t const  top       = environment_top();
10608         scope_t      *old_scope = scope_push(&statement->compound.scope);
10609
10610         statement_t **anchor            = &statement->compound.statements;
10611         bool          only_decls_so_far = true;
10612         while (token.type != '}') {
10613                 if (token.type == T_EOF) {
10614                         errorf(&statement->base.source_position,
10615                                "EOF while parsing compound statement");
10616                         break;
10617                 }
10618                 statement_t *sub_statement = intern_parse_statement();
10619                 if (is_invalid_statement(sub_statement)) {
10620                         /* an error occurred. if we are at an anchor, return */
10621                         if (at_anchor())
10622                                 goto end_error;
10623                         continue;
10624                 }
10625
10626                 if (warning.declaration_after_statement) {
10627                         if (sub_statement->kind != STATEMENT_DECLARATION) {
10628                                 only_decls_so_far = false;
10629                         } else if (!only_decls_so_far) {
10630                                 warningf(&sub_statement->base.source_position,
10631                                          "ISO C90 forbids mixed declarations and code");
10632                         }
10633                 }
10634
10635                 *anchor = sub_statement;
10636
10637                 while (sub_statement->base.next != NULL)
10638                         sub_statement = sub_statement->base.next;
10639
10640                 anchor = &sub_statement->base.next;
10641         }
10642         next_token();
10643
10644         /* look over all statements again to produce no effect warnings */
10645         if (warning.unused_value) {
10646                 statement_t *sub_statement = statement->compound.statements;
10647                 for (; sub_statement != NULL; sub_statement = sub_statement->base.next) {
10648                         if (sub_statement->kind != STATEMENT_EXPRESSION)
10649                                 continue;
10650                         /* don't emit a warning for the last expression in an expression
10651                          * statement as it has always an effect */
10652                         if (inside_expression_statement && sub_statement->base.next == NULL)
10653                                 continue;
10654
10655                         expression_t *expression = sub_statement->expression.expression;
10656                         if (!expression_has_effect(expression)) {
10657                                 warningf(&expression->base.source_position,
10658                                          "statement has no effect");
10659                         }
10660                 }
10661         }
10662
10663 end_error:
10664         rem_anchor_token(T_while);
10665         rem_anchor_token(T_wchar_t);
10666         rem_anchor_token(T_volatile);
10667         rem_anchor_token(T_void);
10668         rem_anchor_token(T_using);
10669         rem_anchor_token(T_unsigned);
10670         rem_anchor_token(T_union);
10671         rem_anchor_token(T_typeof);
10672         rem_anchor_token(T_typename);
10673         rem_anchor_token(T_typeid);
10674         rem_anchor_token(T_typedef);
10675         rem_anchor_token(T_try);
10676         rem_anchor_token(T_true);
10677         rem_anchor_token(T_throw);
10678         rem_anchor_token(T_this);
10679         rem_anchor_token(T_template);
10680         rem_anchor_token(T_switch);
10681         rem_anchor_token(T_struct);
10682         rem_anchor_token(T_static_cast);
10683         rem_anchor_token(T_static);
10684         rem_anchor_token(T_sizeof);
10685         rem_anchor_token(T_signed);
10686         rem_anchor_token(T_short);
10687         rem_anchor_token(T_return);
10688         rem_anchor_token(T_restrict);
10689         rem_anchor_token(T_reinterpret_cast);
10690         rem_anchor_token(T_register);
10691         rem_anchor_token(T_operator);
10692         rem_anchor_token(T_new);
10693         rem_anchor_token(T_long);
10694         rem_anchor_token(T_int);
10695         rem_anchor_token(T_inline);
10696         rem_anchor_token(T_if);
10697         rem_anchor_token(T_goto);
10698         rem_anchor_token(T_for);
10699         rem_anchor_token(T_float);
10700         rem_anchor_token(T_false);
10701         rem_anchor_token(T_extern);
10702         rem_anchor_token(T_enum);
10703         rem_anchor_token(T_dynamic_cast);
10704         rem_anchor_token(T_do);
10705         rem_anchor_token(T_double);
10706         rem_anchor_token(T_delete);
10707         rem_anchor_token(T_default);
10708         rem_anchor_token(T_continue);
10709         rem_anchor_token(T_const_cast);
10710         rem_anchor_token(T_const);
10711         rem_anchor_token(T_class);
10712         rem_anchor_token(T_char);
10713         rem_anchor_token(T_case);
10714         rem_anchor_token(T_break);
10715         rem_anchor_token(T_bool);
10716         rem_anchor_token(T_auto);
10717         rem_anchor_token(T_asm);
10718         rem_anchor_token(T___thread);
10719         rem_anchor_token(T___real__);
10720         rem_anchor_token(T___label__);
10721         rem_anchor_token(T___imag__);
10722         rem_anchor_token(T___func__);
10723         rem_anchor_token(T___extension__);
10724         rem_anchor_token(T___builtin_va_start);
10725         rem_anchor_token(T___attribute__);
10726         rem_anchor_token(T___alignof__);
10727         rem_anchor_token(T___PRETTY_FUNCTION__);
10728         rem_anchor_token(T___FUNCTION__);
10729         rem_anchor_token(T__Imaginary);
10730         rem_anchor_token(T__Complex);
10731         rem_anchor_token(T__Bool);
10732         rem_anchor_token(T_WIDE_STRING_LITERAL);
10733         rem_anchor_token(T_WIDE_CHARACTER_CONSTANT);
10734         rem_anchor_token(T_STRING_LITERAL);
10735         rem_anchor_token(T_PLUSPLUS);
10736         rem_anchor_token(T_MINUSMINUS);
10737         rem_anchor_token(T_INTEGER);
10738         rem_anchor_token(T_IDENTIFIER);
10739         rem_anchor_token(T_FLOATINGPOINT);
10740         rem_anchor_token(T_COLONCOLON);
10741         rem_anchor_token(T_CHARACTER_CONSTANT);
10742         rem_anchor_token('~');
10743         rem_anchor_token('{');
10744         rem_anchor_token('-');
10745         rem_anchor_token('+');
10746         rem_anchor_token('*');
10747         rem_anchor_token('(');
10748         rem_anchor_token('&');
10749         rem_anchor_token('!');
10750         rem_anchor_token('}');
10751         assert(current_scope == &statement->compound.scope);
10752         scope_pop(old_scope);
10753         environment_pop_to(top);
10754
10755         POP_PARENT;
10756         return statement;
10757 }
10758
10759 /**
10760  * Check for unused global static functions and variables
10761  */
10762 static void check_unused_globals(void)
10763 {
10764         if (!warning.unused_function && !warning.unused_variable)
10765                 return;
10766
10767         for (const entity_t *entity = file_scope->entities; entity != NULL;
10768              entity = entity->base.next) {
10769                 if (!is_declaration(entity))
10770                         continue;
10771
10772                 const declaration_t *declaration = &entity->declaration;
10773                 if (declaration->used                  ||
10774                     declaration->modifiers & DM_UNUSED ||
10775                     declaration->modifiers & DM_USED   ||
10776                     declaration->storage_class != STORAGE_CLASS_STATIC)
10777                         continue;
10778
10779                 type_t *const type = declaration->type;
10780                 const char *s;
10781                 if (entity->kind == ENTITY_FUNCTION) {
10782                         /* inhibit warning for static inline functions */
10783                         if (entity->function.is_inline)
10784                                 continue;
10785
10786                         s = entity->function.statement != NULL ? "defined" : "declared";
10787                 } else {
10788                         s = "defined";
10789                 }
10790
10791                 warningf(&declaration->base.source_position, "'%#T' %s but not used",
10792                         type, declaration->base.symbol, s);
10793         }
10794 }
10795
10796 static void parse_global_asm(void)
10797 {
10798         statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
10799
10800         eat(T_asm);
10801         expect('(', end_error);
10802
10803         statement->asms.asm_text = parse_string_literals();
10804         statement->base.next     = unit->global_asm;
10805         unit->global_asm         = statement;
10806
10807         expect(')', end_error);
10808         expect(';', end_error);
10809
10810 end_error:;
10811 }
10812
10813 static void parse_linkage_specification(void)
10814 {
10815         eat(T_extern);
10816         assert(token.type == T_STRING_LITERAL);
10817
10818         const char *linkage = parse_string_literals().begin;
10819
10820         linkage_kind_t old_linkage = current_linkage;
10821         linkage_kind_t new_linkage;
10822         if (strcmp(linkage, "C") == 0) {
10823                 new_linkage = LINKAGE_C;
10824         } else if (strcmp(linkage, "C++") == 0) {
10825                 new_linkage = LINKAGE_CXX;
10826         } else {
10827                 errorf(HERE, "linkage string \"%s\" not recognized", linkage);
10828                 new_linkage = LINKAGE_INVALID;
10829         }
10830         current_linkage = new_linkage;
10831
10832         if (token.type == '{') {
10833                 next_token();
10834                 parse_externals();
10835                 expect('}', end_error);
10836         } else {
10837                 parse_external();
10838         }
10839
10840 end_error:
10841         assert(current_linkage == new_linkage);
10842         current_linkage = old_linkage;
10843 }
10844
10845 static void parse_external(void)
10846 {
10847         switch (token.type) {
10848                 DECLARATION_START_NO_EXTERN
10849                 case T_IDENTIFIER:
10850                 case T___extension__:
10851                 /* tokens below are for implicit int */
10852                 case '&': /* & x; -> int& x; (and error later, because C++ has no
10853                              implicit int) */
10854                 case '*': /* * x; -> int* x; */
10855                 case '(': /* (x); -> int (x); */
10856                         parse_external_declaration();
10857                         return;
10858
10859                 case T_extern:
10860                         if (look_ahead(1)->type == T_STRING_LITERAL) {
10861                                 parse_linkage_specification();
10862                         } else {
10863                                 parse_external_declaration();
10864                         }
10865                         return;
10866
10867                 case T_asm:
10868                         parse_global_asm();
10869                         return;
10870
10871                 case T_namespace:
10872                         parse_namespace_definition();
10873                         return;
10874
10875                 case ';':
10876                         if (!strict_mode) {
10877                                 if (warning.other)
10878                                         warningf(HERE, "stray ';' outside of function");
10879                                 next_token();
10880                                 return;
10881                         }
10882                         /* FALLTHROUGH */
10883
10884                 default:
10885                         errorf(HERE, "stray %K outside of function", &token);
10886                         if (token.type == '(' || token.type == '{' || token.type == '[')
10887                                 eat_until_matching_token(token.type);
10888                         next_token();
10889                         return;
10890         }
10891 }
10892
10893 static void parse_externals(void)
10894 {
10895         add_anchor_token('}');
10896         add_anchor_token(T_EOF);
10897
10898 #ifndef NDEBUG
10899         unsigned char token_anchor_copy[T_LAST_TOKEN];
10900         memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
10901 #endif
10902
10903         while (token.type != T_EOF && token.type != '}') {
10904 #ifndef NDEBUG
10905                 bool anchor_leak = false;
10906                 for (int i = 0; i != T_LAST_TOKEN; ++i) {
10907                         unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
10908                         if (count != 0) {
10909                                 errorf(HERE, "Leaked anchor token %k %d times", i, count);
10910                                 anchor_leak = true;
10911                         }
10912                 }
10913                 if (in_gcc_extension) {
10914                         errorf(HERE, "Leaked __extension__");
10915                         anchor_leak = true;
10916                 }
10917
10918                 if (anchor_leak)
10919                         abort();
10920 #endif
10921
10922                 parse_external();
10923         }
10924
10925         rem_anchor_token(T_EOF);
10926         rem_anchor_token('}');
10927 }
10928
10929 /**
10930  * Parse a translation unit.
10931  */
10932 static void parse_translation_unit(void)
10933 {
10934         add_anchor_token(T_EOF);
10935
10936         while (true) {
10937                 parse_externals();
10938
10939                 if (token.type == T_EOF)
10940                         break;
10941
10942                 errorf(HERE, "stray %K outside of function", &token);
10943                 if (token.type == '(' || token.type == '{' || token.type == '[')
10944                         eat_until_matching_token(token.type);
10945                 next_token();
10946         }
10947 }
10948
10949 /**
10950  * Parse the input.
10951  *
10952  * @return  the translation unit or NULL if errors occurred.
10953  */
10954 void start_parsing(void)
10955 {
10956         environment_stack = NEW_ARR_F(stack_entry_t, 0);
10957         label_stack       = NEW_ARR_F(stack_entry_t, 0);
10958         diagnostic_count  = 0;
10959         error_count       = 0;
10960         warning_count     = 0;
10961
10962         type_set_output(stderr);
10963         ast_set_output(stderr);
10964
10965         assert(unit == NULL);
10966         unit = allocate_ast_zero(sizeof(unit[0]));
10967
10968         assert(file_scope == NULL);
10969         file_scope = &unit->scope;
10970
10971         assert(current_scope == NULL);
10972         scope_push(&unit->scope);
10973
10974         create_gnu_builtins();
10975         if (c_mode & _MS)
10976                 create_microsoft_intrinsics();
10977 }
10978
10979 translation_unit_t *finish_parsing(void)
10980 {
10981         assert(current_scope == &unit->scope);
10982         scope_pop(NULL);
10983
10984         assert(file_scope == &unit->scope);
10985         check_unused_globals();
10986         file_scope = NULL;
10987
10988         DEL_ARR_F(environment_stack);
10989         DEL_ARR_F(label_stack);
10990
10991         translation_unit_t *result = unit;
10992         unit = NULL;
10993         return result;
10994 }
10995
10996 /* §6.9.2:2 and §6.9.2:5: At the end of the translation incomplete arrays
10997  * are given length one. */
10998 static void complete_incomplete_arrays(void)
10999 {
11000         size_t n = ARR_LEN(incomplete_arrays);
11001         for (size_t i = 0; i != n; ++i) {
11002                 declaration_t *const decl      = incomplete_arrays[i];
11003                 type_t        *const orig_type = decl->type;
11004                 type_t        *const type      = skip_typeref(orig_type);
11005
11006                 if (!is_type_incomplete(type))
11007                         continue;
11008
11009                 if (warning.other) {
11010                         warningf(&decl->base.source_position,
11011                                         "array '%#T' assumed to have one element",
11012                                         orig_type, decl->base.symbol);
11013                 }
11014
11015                 type_t *const new_type = duplicate_type(type);
11016                 new_type->array.size_constant     = true;
11017                 new_type->array.has_implicit_size = true;
11018                 new_type->array.size              = 1;
11019
11020                 type_t *const result = identify_new_type(new_type);
11021
11022                 decl->type = result;
11023         }
11024 }
11025
11026 void prepare_main_collect2(entity_t *entity)
11027 {
11028         // create call to __main
11029         symbol_t *symbol         = symbol_table_insert("__main");
11030         entity_t *subsubmain_ent
11031                 = create_implicit_function(symbol, &builtin_source_position);
11032
11033         expression_t *ref         = allocate_expression_zero(EXPR_REFERENCE);
11034         type_t       *ftype       = subsubmain_ent->declaration.type;
11035         ref->base.source_position = builtin_source_position;
11036         ref->base.type            = make_pointer_type(ftype, TYPE_QUALIFIER_NONE);
11037         ref->reference.entity     = subsubmain_ent;
11038
11039         expression_t *call = allocate_expression_zero(EXPR_CALL);
11040         call->base.source_position = builtin_source_position;
11041         call->base.type            = type_void;
11042         call->call.function        = ref;
11043
11044         statement_t *expr_statement = allocate_statement_zero(STATEMENT_EXPRESSION);
11045         expr_statement->base.source_position  = builtin_source_position;
11046         expr_statement->expression.expression = call;
11047
11048         statement_t *statement = entity->function.statement;
11049         assert(statement->kind == STATEMENT_COMPOUND);
11050         compound_statement_t *compounds = &statement->compound;
11051
11052         expr_statement->base.next = compounds->statements;
11053         compounds->statements     = expr_statement;
11054 }
11055
11056 void parse(void)
11057 {
11058         lookahead_bufpos = 0;
11059         for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
11060                 next_token();
11061         }
11062         current_linkage   = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C;
11063         incomplete_arrays = NEW_ARR_F(declaration_t*, 0);
11064         parse_translation_unit();
11065         complete_incomplete_arrays();
11066         DEL_ARR_F(incomplete_arrays);
11067         incomplete_arrays = NULL;
11068 }
11069
11070 /**
11071  * create a builtin function.
11072  */
11073 static entity_t *create_builtin_function(builtin_kind_t kind, const char *name, type_t *function_type)
11074 {
11075         symbol_t *symbol = symbol_table_insert(name);
11076         entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION);
11077         entity->declaration.storage_class          = STORAGE_CLASS_EXTERN;
11078         entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN;
11079         entity->declaration.type                   = function_type;
11080         entity->declaration.implicit               = true;
11081         entity->base.symbol                        = symbol;
11082         entity->base.source_position               = builtin_source_position;
11083
11084         entity->function.btk                       = kind;
11085
11086         record_entity(entity, /*is_definition=*/false);
11087         return entity;
11088 }
11089
11090
11091 /**
11092  * Create predefined gnu builtins.
11093  */
11094 static void create_gnu_builtins(void)
11095 {
11096 #define GNU_BUILTIN(a, b) create_builtin_function(bk_gnu_builtin_##a, "__builtin_" #a, b)
11097
11098         GNU_BUILTIN(alloca,         make_function_1_type(type_void_ptr, type_size_t));
11099         GNU_BUILTIN(huge_val,       make_function_0_type(type_double));
11100         GNU_BUILTIN(inf,            make_function_0_type(type_double));
11101         GNU_BUILTIN(inff,           make_function_0_type(type_float));
11102         GNU_BUILTIN(infl,           make_function_0_type(type_long_double));
11103         GNU_BUILTIN(nan,            make_function_1_type(type_double, type_char_ptr));
11104         GNU_BUILTIN(nanf,           make_function_1_type(type_float, type_char_ptr));
11105         GNU_BUILTIN(nanl,           make_function_1_type(type_long_double, type_char_ptr));
11106         GNU_BUILTIN(va_end,         make_function_1_type(type_void, type_valist));
11107         GNU_BUILTIN(expect,         make_function_2_type(type_long, type_long, type_long));
11108         GNU_BUILTIN(return_address, make_function_1_type(type_void_ptr, type_unsigned_int));
11109         GNU_BUILTIN(frame_address,  make_function_1_type(type_void_ptr, type_unsigned_int));
11110         GNU_BUILTIN(ffs,            make_function_1_type(type_int, type_unsigned_int));
11111         GNU_BUILTIN(clz,            make_function_1_type(type_int, type_unsigned_int));
11112         GNU_BUILTIN(ctz,            make_function_1_type(type_int, type_unsigned_int));
11113         GNU_BUILTIN(popcount,       make_function_1_type(type_int, type_unsigned_int));
11114         GNU_BUILTIN(parity,         make_function_1_type(type_int, type_unsigned_int));
11115         GNU_BUILTIN(prefetch,       make_function_1_type_variadic(type_float, type_void_ptr));
11116         GNU_BUILTIN(trap,           make_function_0_type_noreturn(type_void));
11117
11118 #undef GNU_BUILTIN
11119 }
11120
11121 /**
11122  * Create predefined MS intrinsics.
11123  */
11124 static void create_microsoft_intrinsics(void)
11125 {
11126 #define MS_BUILTIN(a, b) create_builtin_function(bk_ms##a, #a, b)
11127
11128         /* intrinsics for all architectures */
11129         MS_BUILTIN(_rotl,                  make_function_2_type(type_unsigned_int,   type_unsigned_int, type_int));
11130         MS_BUILTIN(_rotr,                  make_function_2_type(type_unsigned_int,   type_unsigned_int, type_int));
11131         MS_BUILTIN(_rotl64,                make_function_2_type(type_unsigned_int64, type_unsigned_int64, type_int));
11132         MS_BUILTIN(_rotr64,                make_function_2_type(type_unsigned_int64, type_unsigned_int64, type_int));
11133         MS_BUILTIN(_byteswap_ushort,       make_function_1_type(type_unsigned_short, type_unsigned_short));
11134         MS_BUILTIN(_byteswap_ulong,        make_function_1_type(type_unsigned_long,  type_unsigned_long));
11135         MS_BUILTIN(_byteswap_uint64,       make_function_1_type(type_unsigned_int64, type_unsigned_int64));
11136
11137         MS_BUILTIN(__debugbreak,            make_function_0_type(type_void));
11138         MS_BUILTIN(_ReturnAddress,          make_function_0_type(type_void_ptr));
11139         MS_BUILTIN(_AddressOfReturnAddress, make_function_0_type(type_void_ptr));
11140         MS_BUILTIN(__popcount,              make_function_1_type(type_unsigned_int, type_unsigned_int));
11141
11142         /* x86/x64 only */
11143         MS_BUILTIN(_enable,                make_function_0_type(type_void));
11144         MS_BUILTIN(_disable,               make_function_0_type(type_void));
11145         MS_BUILTIN(__inbyte,               make_function_1_type(type_unsigned_char, type_unsigned_short));
11146         MS_BUILTIN(__inword,               make_function_1_type(type_unsigned_short, type_unsigned_short));
11147         MS_BUILTIN(__indword,              make_function_1_type(type_unsigned_long, type_unsigned_short));
11148         MS_BUILTIN(__outbyte,              make_function_2_type(type_void, type_unsigned_short, type_unsigned_char));
11149         MS_BUILTIN(__outword,              make_function_2_type(type_void, type_unsigned_short, type_unsigned_short));
11150         MS_BUILTIN(__outdword,             make_function_2_type(type_void, type_unsigned_short, type_unsigned_long));
11151         MS_BUILTIN(__ud2,                  make_function_0_type_noreturn(type_void));
11152         MS_BUILTIN(_BitScanForward,        make_function_2_type(type_unsigned_char, type_unsigned_long_ptr, type_unsigned_long));
11153         MS_BUILTIN(_BitScanReverse,        make_function_2_type(type_unsigned_char, type_unsigned_long_ptr, type_unsigned_long));
11154         MS_BUILTIN(_InterlockedExchange,   make_function_2_type(type_long, type_long_ptr, type_long));
11155         MS_BUILTIN(_InterlockedExchange64, make_function_2_type(type_int64, type_int64_ptr, type_int64));
11156
11157         if (machine_size <= 32) {
11158                 MS_BUILTIN(__readeflags,           make_function_0_type(type_unsigned_int));
11159                 MS_BUILTIN(__writeeflags,          make_function_1_type(type_void, type_unsigned_int));
11160         } else {
11161                 MS_BUILTIN(__readeflags,           make_function_0_type(type_unsigned_int64));
11162                 MS_BUILTIN(__writeeflags,          make_function_1_type(type_void, type_unsigned_int64));
11163         }
11164
11165 #undef MS_BUILTIN
11166 }
11167
11168 /**
11169  * Initialize the parser.
11170  */
11171 void init_parser(void)
11172 {
11173         sym_anonymous = symbol_table_insert("<anonymous>");
11174
11175         memset(token_anchor_set, 0, sizeof(token_anchor_set));
11176
11177         init_expression_parsers();
11178         obstack_init(&temp_obst);
11179
11180         symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
11181         type_valist = create_builtin_type(va_list_sym, type_void_ptr);
11182 }
11183
11184 /**
11185  * Terminate the parser.
11186  */
11187 void exit_parser(void)
11188 {
11189         obstack_free(&temp_obst, NULL);
11190 }