nsz Git - cparser/blob - parser.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2008 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 "lang_features.h"
  37 #include "warning.h"
  38 #include "adt/bitfiddle.h"
  39 #include "adt/error.h"
  40 #include "adt/array.h"
  41
  42 /** if wchar_t is equal to unsigned short. */
  43 bool opt_short_wchar_t =
  44 #ifdef _WIN32
  45         true;
  46 #else
  47         false;
  48 #endif
  49
  50 //#define PRINT_TOKENS
  51 #define MAX_LOOKAHEAD 2
  52
  53 typedef struct {
  54         declaration_t *old_declaration;
  55         symbol_t      *symbol;
  56         unsigned short namespc;
  57 } stack_entry_t;
  58
  59 typedef struct argument_list_t argument_list_t;
  60 struct argument_list_t {
  61         long              argument;
  62         argument_list_t  *next;
  63 };
  64
  65 typedef struct gnu_attribute_t gnu_attribute_t;
  66 struct gnu_attribute_t {
  67         gnu_attribute_kind_t kind;           /**< The kind of the GNU attribute. */
  68         gnu_attribute_t     *next;
  69         bool                 invalid;        /**< Set if this attribute had argument errors, */
  70         bool                 have_arguments; /**< True, if this attribute has arguments. */
  71         union {
  72                 size_t              value;
  73                 string_t            string;
  74                 atomic_type_kind_t  akind;
  75                 long                argument;  /**< Single argument. */
  76                 argument_list_t    *arguments; /**< List of argument expressions. */
  77         } u;
  78 };
  79
  80 typedef struct declaration_specifiers_t  declaration_specifiers_t;
  81 struct declaration_specifiers_t {
  82         source_position_t  source_position;
  83         unsigned char      declared_storage_class;
  84         unsigned char      alignment;         /**< Alignment, 0 if not set. */
  85         unsigned int       is_inline : 1;
  86         unsigned int       deprecated : 1;
  87         decl_modifiers_t   modifiers;         /**< declaration modifiers */
  88         gnu_attribute_t   *gnu_attributes;    /**< list of GNU attributes */
  89         const char        *deprecated_string; /**< can be set if declaration was marked deprecated. */
  90         symbol_t          *get_property_sym;  /**< the name of the get property if set. */
  91         symbol_t          *put_property_sym;  /**< the name of the put property if set. */
  92         type_t            *type;
  93 };
  94
  95 /**
  96  * An environment for parsing initializers (and compound literals).
  97  */
  98 typedef struct parse_initializer_env_t {
  99         type_t        *type;        /**< the type of the initializer. In case of an
 100                                          array type with unspecified size this gets
 101                                          adjusted to the actual size. */
 102         declaration_t *declaration; /**< the declaration that is initialized if any */
 103         bool           must_be_constant;
 104 } parse_initializer_env_t;
 105
 106 typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration, bool is_definition);
 107
 108 /** The current token. */
 109 static token_t             token;
 110 /** The lookahead ring-buffer. */
 111 static token_t             lookahead_buffer[MAX_LOOKAHEAD];
 112 /** Position of the next token in the lookahead buffer. */
 113 static int                 lookahead_bufpos;
 114 static stack_entry_t      *environment_stack = NULL;
 115 static stack_entry_t      *label_stack       = NULL;
 116 static stack_entry_t      *local_label_stack = NULL;
 117 /** The global file scope. */
 118 static scope_t            *file_scope        = NULL;
 119 /** The current scope. */
 120 static scope_t            *scope             = NULL;
 121 static declaration_t      *last_declaration  = NULL;
 122 /** Point to the current function declaration if inside a function. */
 123 static declaration_t      *current_function  = NULL;
 124 static declaration_t      *current_init_decl = NULL;
 125 static switch_statement_t *current_switch    = NULL;
 126 static statement_t        *current_loop      = NULL;
 127 static statement_t        *current_parent    = NULL;
 128 static ms_try_statement_t *current_try       = NULL;
 129 static goto_statement_t   *goto_first        = NULL;
 130 static goto_statement_t   *goto_last         = NULL;
 131 static label_statement_t  *label_first       = NULL;
 132 static label_statement_t  *label_last        = NULL;
 133 /** current translation unit. */
 134 static translation_unit_t *unit              = NULL;
 135 /** true if we are in a type property context (evaluation only for type. */
 136 static bool                in_type_prop      = false;
 137 /** true in we are in a __extension__ context. */
 138 static bool                in_gcc_extension  = false;
 139 static struct obstack      temp_obst;
 140
 141
 142 #define PUSH_PARENT(stmt)                          \
 143         statement_t *const prev_parent = current_parent; \
 144         current_parent = (stmt);
 145 #define POP_PARENT ((void)(current_parent = prev_parent))
 146
 147 static source_position_t null_position = { NULL, 0 };
 148
 149 /** special symbol used for anonymous entities. */
 150 static const symbol_t *sym_anonymous = NULL;
 151
 152 /* symbols for Microsoft extended-decl-modifier */
 153 static const symbol_t *sym_align      = NULL;
 154 static const symbol_t *sym_allocate   = NULL;
 155 static const symbol_t *sym_dllimport  = NULL;
 156 static const symbol_t *sym_dllexport  = NULL;
 157 static const symbol_t *sym_naked      = NULL;
 158 static const symbol_t *sym_noinline   = NULL;
 159 static const symbol_t *sym_noreturn   = NULL;
 160 static const symbol_t *sym_nothrow    = NULL;
 161 static const symbol_t *sym_novtable   = NULL;
 162 static const symbol_t *sym_property   = NULL;
 163 static const symbol_t *sym_get        = NULL;
 164 static const symbol_t *sym_put        = NULL;
 165 static const symbol_t *sym_selectany  = NULL;
 166 static const symbol_t *sym_thread     = NULL;
 167 static const symbol_t *sym_uuid       = NULL;
 168 static const symbol_t *sym_deprecated = NULL;
 169 static const symbol_t *sym_restrict   = NULL;
 170 static const symbol_t *sym_noalias    = NULL;
 171
 172 /** The token anchor set */
 173 static unsigned char token_anchor_set[T_LAST_TOKEN];
 174
 175 /** The current source position. */
 176 #define HERE (&token.source_position)
 177
 178 /** true if we are in GCC mode. */
 179 #define GNU_MODE ((c_mode & _GNUC) || in_gcc_extension)
 180
 181 static type_t *type_valist;
 182
 183 static statement_t *parse_compound_statement(bool inside_expression_statement);
 184 static statement_t *parse_statement(void);
 185
 186 static expression_t *parse_sub_expression(unsigned precedence);
 187 static expression_t *parse_expression(void);
 188 static type_t       *parse_typename(void);
 189
 190 static void parse_compound_type_entries(declaration_t *compound_declaration);
 191 static declaration_t *parse_declarator(
 192                 const declaration_specifiers_t *specifiers, bool may_be_abstract);
 193 static declaration_t *record_declaration(declaration_t *declaration, bool is_definition);
 194
 195 static void semantic_comparison(binary_expression_t *expression);
 196
 197 #define STORAGE_CLASSES     \
 198         case T_typedef:         \
 199         case T_extern:          \
 200         case T_static:          \
 201         case T_auto:            \
 202         case T_register:        \
 203         case T___thread:
 204
 205 #define TYPE_QUALIFIERS     \
 206         case T_const:           \
 207         case T_restrict:        \
 208         case T_volatile:        \
 209         case T_inline:          \
 210         case T__forceinline:    \
 211         case T___attribute__:
 212
 213 #ifdef PROVIDE_COMPLEX
 214 #define COMPLEX_SPECIFIERS  \
 215         case T__Complex:
 216 #define IMAGINARY_SPECIFIERS \
 217         case T__Imaginary:
 218 #else
 219 #define COMPLEX_SPECIFIERS
 220 #define IMAGINARY_SPECIFIERS
 221 #endif
 222
 223 #define TYPE_SPECIFIERS       \
 224         case T_void:              \
 225         case T_char:              \
 226         case T_short:             \
 227         case T_int:               \
 228         case T_long:              \
 229         case T_float:             \
 230         case T_double:            \
 231         case T_signed:            \
 232         case T_unsigned:          \
 233         case T__Bool:             \
 234         case T_struct:            \
 235         case T_union:             \
 236         case T_enum:              \
 237         case T___typeof__:        \
 238         case T___builtin_va_list: \
 239         case T__declspec:         \
 240         COMPLEX_SPECIFIERS        \
 241         IMAGINARY_SPECIFIERS
 242
 243 #define DECLARATION_START   \
 244         STORAGE_CLASSES         \
 245         TYPE_QUALIFIERS         \
 246         TYPE_SPECIFIERS
 247
 248 #define TYPENAME_START      \
 249         TYPE_QUALIFIERS         \
 250         TYPE_SPECIFIERS
 251
 252 /**
 253  * Allocate an AST node with given size and
 254  * initialize all fields with zero.
 255  */
 256 static void *allocate_ast_zero(size_t size)
 257 {
 258         void *res = allocate_ast(size);
 259         memset(res, 0, size);
 260         return res;
 261 }
 262
 263 static declaration_t *allocate_declaration_zero(void)
 264 {
 265         declaration_t *declaration = allocate_ast_zero(sizeof(declaration_t));
 266         declaration->type      = type_error_type;
 267         declaration->alignment = 0;
 268         return declaration;
 269 }
 270
 271 /**
 272  * Returns the size of a statement node.
 273  *
 274  * @param kind  the statement kind
 275  */
 276 static size_t get_statement_struct_size(statement_kind_t kind)
 277 {
 278         static const size_t sizes[] = {
 279                 [STATEMENT_INVALID]     = sizeof(invalid_statement_t),
 280                 [STATEMENT_EMPTY]       = sizeof(empty_statement_t),
 281                 [STATEMENT_COMPOUND]    = sizeof(compound_statement_t),
 282                 [STATEMENT_RETURN]      = sizeof(return_statement_t),
 283                 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
 284                 [STATEMENT_IF]          = sizeof(if_statement_t),
 285                 [STATEMENT_SWITCH]      = sizeof(switch_statement_t),
 286                 [STATEMENT_EXPRESSION]  = sizeof(expression_statement_t),
 287                 [STATEMENT_CONTINUE]    = sizeof(statement_base_t),
 288                 [STATEMENT_BREAK]       = sizeof(statement_base_t),
 289                 [STATEMENT_GOTO]        = sizeof(goto_statement_t),
 290                 [STATEMENT_LABEL]       = sizeof(label_statement_t),
 291                 [STATEMENT_CASE_LABEL]  = sizeof(case_label_statement_t),
 292                 [STATEMENT_WHILE]       = sizeof(while_statement_t),
 293                 [STATEMENT_DO_WHILE]    = sizeof(do_while_statement_t),
 294                 [STATEMENT_FOR]         = sizeof(for_statement_t),
 295                 [STATEMENT_ASM]         = sizeof(asm_statement_t),
 296                 [STATEMENT_MS_TRY]      = sizeof(ms_try_statement_t),
 297                 [STATEMENT_LEAVE]       = sizeof(leave_statement_t)
 298         };
 299         assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
 300         assert(sizes[kind] != 0);
 301         return sizes[kind];
 302 }
 303
 304 /**
 305  * Returns the size of an expression node.
 306  *
 307  * @param kind  the expression kind
 308  */
 309 static size_t get_expression_struct_size(expression_kind_t kind)
 310 {
 311         static const size_t sizes[] = {
 312                 [EXPR_INVALID]                 = sizeof(expression_base_t),
 313                 [EXPR_REFERENCE]               = sizeof(reference_expression_t),
 314                 [EXPR_CONST]                   = sizeof(const_expression_t),
 315                 [EXPR_CHARACTER_CONSTANT]      = sizeof(const_expression_t),
 316                 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
 317                 [EXPR_STRING_LITERAL]          = sizeof(string_literal_expression_t),
 318                 [EXPR_WIDE_STRING_LITERAL]     = sizeof(wide_string_literal_expression_t),
 319                 [EXPR_COMPOUND_LITERAL]        = sizeof(compound_literal_expression_t),
 320                 [EXPR_CALL]                    = sizeof(call_expression_t),
 321                 [EXPR_UNARY_FIRST]             = sizeof(unary_expression_t),
 322                 [EXPR_BINARY_FIRST]            = sizeof(binary_expression_t),
 323                 [EXPR_CONDITIONAL]             = sizeof(conditional_expression_t),
 324                 [EXPR_SELECT]                  = sizeof(select_expression_t),
 325                 [EXPR_ARRAY_ACCESS]            = sizeof(array_access_expression_t),
 326                 [EXPR_SIZEOF]                  = sizeof(typeprop_expression_t),
 327                 [EXPR_ALIGNOF]                 = sizeof(typeprop_expression_t),
 328                 [EXPR_CLASSIFY_TYPE]           = sizeof(classify_type_expression_t),
 329                 [EXPR_FUNCNAME]                = sizeof(funcname_expression_t),
 330                 [EXPR_BUILTIN_SYMBOL]          = sizeof(builtin_symbol_expression_t),
 331                 [EXPR_BUILTIN_CONSTANT_P]      = sizeof(builtin_constant_expression_t),
 332                 [EXPR_BUILTIN_PREFETCH]        = sizeof(builtin_prefetch_expression_t),
 333                 [EXPR_OFFSETOF]                = sizeof(offsetof_expression_t),
 334                 [EXPR_VA_START]                = sizeof(va_start_expression_t),
 335                 [EXPR_VA_ARG]                  = sizeof(va_arg_expression_t),
 336                 [EXPR_STATEMENT]               = sizeof(statement_expression_t),
 337                 [EXPR_LABEL_ADDRESS]           = sizeof(label_address_expression_t),
 338         };
 339         if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
 340                 return sizes[EXPR_UNARY_FIRST];
 341         }
 342         if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
 343                 return sizes[EXPR_BINARY_FIRST];
 344         }
 345         assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
 346         assert(sizes[kind] != 0);
 347         return sizes[kind];
 348 }
 349
 350 /**
 351  * Allocate a statement node of given kind and initialize all
 352  * fields with zero.
 353  */
 354 static statement_t *allocate_statement_zero(statement_kind_t kind)
 355 {
 356         size_t       size = get_statement_struct_size(kind);
 357         statement_t *res  = allocate_ast_zero(size);
 358
 359         res->base.kind            = kind;
 360         res->base.parent          = current_parent;
 361         res->base.source_position = token.source_position;
 362         return res;
 363 }
 364
 365 /**
 366  * Allocate an expression node of given kind and initialize all
 367  * fields with zero.
 368  */
 369 static expression_t *allocate_expression_zero(expression_kind_t kind)
 370 {
 371         size_t        size = get_expression_struct_size(kind);
 372         expression_t *res  = allocate_ast_zero(size);
 373
 374         res->base.kind = kind;
 375         res->base.type = type_error_type;
 376         return res;
 377 }
 378
 379 /**
 380  * Creates a new invalid expression.
 381  */
 382 static expression_t *create_invalid_expression(void)
 383 {
 384         expression_t *expression         = allocate_expression_zero(EXPR_INVALID);
 385         expression->base.source_position = token.source_position;
 386         return expression;
 387 }
 388
 389 /**
 390  * Creates a new invalid statement.
 391  */
 392 static statement_t *create_invalid_statement(void)
 393 {
 394         return allocate_statement_zero(STATEMENT_INVALID);
 395 }
 396
 397 /**
 398  * Allocate a new empty statement.
 399  */
 400 static statement_t *create_empty_statement(void)
 401 {
 402         return allocate_statement_zero(STATEMENT_EMPTY);
 403 }
 404
 405 /**
 406  * Returns the size of a type node.
 407  *
 408  * @param kind  the type kind
 409  */
 410 static size_t get_type_struct_size(type_kind_t kind)
 411 {
 412         static const size_t sizes[] = {
 413                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
 414                 [TYPE_COMPLEX]         = sizeof(complex_type_t),
 415                 [TYPE_IMAGINARY]       = sizeof(imaginary_type_t),
 416                 [TYPE_BITFIELD]        = sizeof(bitfield_type_t),
 417                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
 418                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
 419                 [TYPE_ENUM]            = sizeof(enum_type_t),
 420                 [TYPE_FUNCTION]        = sizeof(function_type_t),
 421                 [TYPE_POINTER]         = sizeof(pointer_type_t),
 422                 [TYPE_ARRAY]           = sizeof(array_type_t),
 423                 [TYPE_BUILTIN]         = sizeof(builtin_type_t),
 424                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
 425                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
 426         };
 427         assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
 428         assert(kind <= TYPE_TYPEOF);
 429         assert(sizes[kind] != 0);
 430         return sizes[kind];
 431 }
 432
 433 /**
 434  * Allocate a type node of given kind and initialize all
 435  * fields with zero.
 436  *
 437  * @param kind             type kind to allocate
 438  * @param source_position  the source position of the type definition
 439  */
 440 static type_t *allocate_type_zero(type_kind_t kind, const source_position_t *source_position)
 441 {
 442         size_t  size = get_type_struct_size(kind);
 443         type_t *res  = obstack_alloc(type_obst, size);
 444         memset(res, 0, size);
 445
 446         res->base.kind            = kind;
 447         res->base.source_position = *source_position;
 448         return res;
 449 }
 450
 451 /**
 452  * Returns the size of an initializer node.
 453  *
 454  * @param kind  the initializer kind
 455  */
 456 static size_t get_initializer_size(initializer_kind_t kind)
 457 {
 458         static const size_t sizes[] = {
 459                 [INITIALIZER_VALUE]       = sizeof(initializer_value_t),
 460                 [INITIALIZER_STRING]      = sizeof(initializer_string_t),
 461                 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
 462                 [INITIALIZER_LIST]        = sizeof(initializer_list_t),
 463                 [INITIALIZER_DESIGNATOR]  = sizeof(initializer_designator_t)
 464         };
 465         assert(kind < sizeof(sizes) / sizeof(*sizes));
 466         assert(sizes[kind] != 0);
 467         return sizes[kind];
 468 }
 469
 470 /**
 471  * Allocate an initializer node of given kind and initialize all
 472  * fields with zero.
 473  */
 474 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
 475 {
 476         initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
 477         result->kind          = kind;
 478
 479         return result;
 480 }
 481
 482 /**
 483  * Free a type from the type obstack.
 484  */
 485 static void free_type(void *type)
 486 {
 487         obstack_free(type_obst, type);
 488 }
 489
 490 /**
 491  * Returns the index of the top element of the environment stack.
 492  */
 493 static size_t environment_top(void)
 494 {
 495         return ARR_LEN(environment_stack);
 496 }
 497
 498 /**
 499  * Returns the index of the top element of the global label stack.
 500  */
 501 static size_t label_top(void)
 502 {
 503         return ARR_LEN(label_stack);
 504 }
 505
 506 /**
 507  * Returns the index of the top element of the local label stack.
 508  */
 509 static size_t local_label_top(void)
 510 {
 511         return ARR_LEN(local_label_stack);
 512 }
 513
 514 /**
 515  * Return the next token.
 516  */
 517 static inline void next_token(void)
 518 {
 519         token                              = lookahead_buffer[lookahead_bufpos];
 520         lookahead_buffer[lookahead_bufpos] = lexer_token;
 521         lexer_next_token();
 522
 523         lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
 524
 525 #ifdef PRINT_TOKENS
 526         print_token(stderr, &token);
 527         fprintf(stderr, "\n");
 528 #endif
 529 }
 530
 531 /**
 532  * Return the next token with a given lookahead.
 533  */
 534 static inline const token_t *look_ahead(int num)
 535 {
 536         assert(num > 0 && num <= MAX_LOOKAHEAD);
 537         int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
 538         return &lookahead_buffer[pos];
 539 }
 540
 541 /**
 542  * Adds a token to the token anchor set (a multi-set).
 543  */
 544 static void add_anchor_token(int token_type)
 545 {
 546         assert(0 <= token_type && token_type < T_LAST_TOKEN);
 547         ++token_anchor_set[token_type];
 548 }
 549
 550 static int save_and_reset_anchor_state(int token_type)
 551 {
 552         assert(0 <= token_type && token_type < T_LAST_TOKEN);
 553         int count = token_anchor_set[token_type];
 554         token_anchor_set[token_type] = 0;
 555         return count;
 556 }
 557
 558 static void restore_anchor_state(int token_type, int count)
 559 {
 560         assert(0 <= token_type && token_type < T_LAST_TOKEN);
 561         token_anchor_set[token_type] = count;
 562 }
 563
 564 /**
 565  * Remove a token from the token anchor set (a multi-set).
 566  */
 567 static void rem_anchor_token(int token_type)
 568 {
 569         assert(0 <= token_type && token_type < T_LAST_TOKEN);
 570         assert(token_anchor_set[token_type] != 0);
 571         --token_anchor_set[token_type];
 572 }
 573
 574 static bool at_anchor(void)
 575 {
 576         if (token.type < 0)
 577                 return false;
 578         return token_anchor_set[token.type];
 579 }
 580
 581 /**
 582  * Eat tokens until a matching token is found.
 583  */
 584 static void eat_until_matching_token(int type)
 585 {
 586         int end_token;
 587         switch (type) {
 588                 case '(': end_token = ')';  break;
 589                 case '{': end_token = '}';  break;
 590                 case '[': end_token = ']';  break;
 591                 default:  end_token = type; break;
 592         }
 593
 594         unsigned parenthesis_count = 0;
 595         unsigned brace_count       = 0;
 596         unsigned bracket_count     = 0;
 597         while (token.type        != end_token ||
 598                parenthesis_count != 0         ||
 599                brace_count       != 0         ||
 600                bracket_count     != 0) {
 601                 switch (token.type) {
 602                 case T_EOF: return;
 603                 case '(': ++parenthesis_count; break;
 604                 case '{': ++brace_count;       break;
 605                 case '[': ++bracket_count;     break;
 606
 607                 case ')':
 608                         if (parenthesis_count > 0)
 609                                 --parenthesis_count;
 610                         goto check_stop;
 611
 612                 case '}':
 613                         if (brace_count > 0)
 614                                 --brace_count;
 615                         goto check_stop;
 616
 617                 case ']':
 618                         if (bracket_count > 0)
 619                                 --bracket_count;
 620 check_stop:
 621                         if (token.type        == end_token &&
 622                             parenthesis_count == 0         &&
 623                             brace_count       == 0         &&
 624                             bracket_count     == 0)
 625                                 return;
 626                         break;
 627
 628                 default:
 629                         break;
 630                 }
 631                 next_token();
 632         }
 633 }
 634
 635 /**
 636  * Eat input tokens until an anchor is found.
 637  */
 638 static void eat_until_anchor(void)
 639 {
 640         while (token_anchor_set[token.type] == 0) {
 641                 if (token.type == '(' || token.type == '{' || token.type == '[')
 642                         eat_until_matching_token(token.type);
 643                 next_token();
 644         }
 645 }
 646
 647 static void eat_block(void)
 648 {
 649         eat_until_matching_token('{');
 650         if (token.type == '}')
 651                 next_token();
 652 }
 653
 654 #define eat(token_type)  do { assert(token.type == token_type); next_token(); } while (0)
 655
 656 /**
 657  * Report a parse error because an expected token was not found.
 658  */
 659 static
 660 #if defined __GNUC__ && __GNUC__ >= 4
 661 __attribute__((sentinel))
 662 #endif
 663 void parse_error_expected(const char *message, ...)
 664 {
 665         if (message != NULL) {
 666                 errorf(HERE, "%s", message);
 667         }
 668         va_list ap;
 669         va_start(ap, message);
 670         errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
 671         va_end(ap);
 672 }
 673
 674 /**
 675  * Report a type error.
 676  */
 677 static void type_error(const char *msg, const source_position_t *source_position,
 678                        type_t *type)
 679 {
 680         errorf(source_position, "%s, but found type '%T'", msg, type);
 681 }
 682
 683 /**
 684  * Report an incompatible type.
 685  */
 686 static void type_error_incompatible(const char *msg,
 687                 const source_position_t *source_position, type_t *type1, type_t *type2)
 688 {
 689         errorf(source_position, "%s, incompatible types: '%T' - '%T'",
 690                msg, type1, type2);
 691 }
 692
 693 /**
 694  * Expect the the current token is the expected token.
 695  * If not, generate an error, eat the current statement,
 696  * and goto the end_error label.
 697  */
 698 #define expect(expected)                                  \
 699         do {                                                  \
 700                 if (UNLIKELY(token.type != (expected))) {         \
 701                         parse_error_expected(NULL, (expected), NULL); \
 702                         add_anchor_token(expected);                   \
 703                         eat_until_anchor();                           \
 704                         if (token.type == expected)                   \
 705                                 next_token();                             \
 706                         rem_anchor_token(expected);                   \
 707                         goto end_error;                               \
 708                 }                                                 \
 709                 next_token();                                     \
 710         } while (0)
 711
 712 static void scope_push(scope_t *new_scope)
 713 {
 714         if (scope != NULL) {
 715                 scope->last_declaration = last_declaration;
 716                 new_scope->depth        = scope->depth + 1;
 717         }
 718         new_scope->parent = scope;
 719         scope             = new_scope;
 720
 721         last_declaration = new_scope->last_declaration;
 722 }
 723
 724 static void scope_pop(void)
 725 {
 726         scope->last_declaration = last_declaration;
 727         scope = scope->parent;
 728         last_declaration = scope->last_declaration;
 729 }
 730
 731 /**
 732  * Search a symbol in a given namespace and returns its declaration or
 733  * NULL if this symbol was not found.
 734  */
 735 static declaration_t *get_declaration(const symbol_t *const symbol,
 736                                       const namespace_t namespc)
 737 {
 738         declaration_t *declaration = symbol->declaration;
 739         for( ; declaration != NULL; declaration = declaration->symbol_next) {
 740                 if (declaration->namespc == namespc)
 741                         return declaration;
 742         }
 743
 744         return NULL;
 745 }
 746
 747 /**
 748  * pushs an environment_entry on the environment stack and links the
 749  * corresponding symbol to the new entry
 750  */
 751 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
 752 {
 753         symbol_t    *symbol  = declaration->symbol;
 754         namespace_t  namespc = (namespace_t) declaration->namespc;
 755
 756         /* replace/add declaration into declaration list of the symbol */
 757         declaration_t **anchor;
 758         declaration_t  *iter;
 759         for (anchor = &symbol->declaration;; anchor = &iter->symbol_next) {
 760                 iter = *anchor;
 761                 if (iter == NULL)
 762                         break;
 763
 764                 /* replace an entry? */
 765                 if (iter->namespc == namespc) {
 766                         declaration->symbol_next = iter->symbol_next;
 767                         break;
 768                 }
 769         }
 770         *anchor = declaration;
 771
 772         /* remember old declaration */
 773         stack_entry_t entry;
 774         entry.symbol          = symbol;
 775         entry.old_declaration = iter;
 776         entry.namespc         = (unsigned short) namespc;
 777         ARR_APP1(stack_entry_t, *stack_ptr, entry);
 778 }
 779
 780 /**
 781  * Push a declaration on the environment stack.
 782  *
 783  * @param declaration  the declaration
 784  */
 785 static void environment_push(declaration_t *declaration)
 786 {
 787         assert(declaration->source_position.input_name != NULL);
 788         assert(declaration->parent_scope != NULL);
 789         stack_push(&environment_stack, declaration);
 790 }
 791
 792 /**
 793  * Push a declaration on the global label stack.
 794  *
 795  * @param declaration  the declaration
 796  */
 797 static void label_push(declaration_t *declaration)
 798 {
 799         declaration->parent_scope = &current_function->scope;
 800         stack_push(&label_stack, declaration);
 801 }
 802
 803 /**
 804  * Push a declaration of the local label stack.
 805  *
 806  * @param declaration  the declaration
 807  */
 808 static void local_label_push(declaration_t *declaration)
 809 {
 810         assert(declaration->parent_scope != NULL);
 811         stack_push(&local_label_stack, declaration);
 812 }
 813
 814 /**
 815  * pops symbols from the environment stack until @p new_top is the top element
 816  */
 817 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
 818 {
 819         stack_entry_t *stack = *stack_ptr;
 820         size_t         top   = ARR_LEN(stack);
 821         size_t         i;
 822
 823         assert(new_top <= top);
 824         if (new_top == top)
 825                 return;
 826
 827         for(i = top; i > new_top; --i) {
 828                 stack_entry_t *entry = &stack[i - 1];
 829
 830                 declaration_t *old_declaration = entry->old_declaration;
 831                 symbol_t      *symbol          = entry->symbol;
 832                 namespace_t    namespc         = (namespace_t)entry->namespc;
 833
 834                 /* replace/remove declaration */
 835                 declaration_t **anchor;
 836                 declaration_t  *iter;
 837                 for (anchor = &symbol->declaration;; anchor = &iter->symbol_next) {
 838                         iter = *anchor;
 839                         assert(iter != NULL);
 840                         /* replace an entry? */
 841                         if (iter->namespc == namespc)
 842                                 break;
 843                 }
 844
 845                 /* Because of scopes and appending other namespaces to the end of
 846                  * the list, this must hold. */
 847                 assert((old_declaration != NULL ? old_declaration->symbol_next : NULL) == iter->symbol_next);
 848                 *anchor = old_declaration;
 849         }
 850
 851         ARR_SHRINKLEN(*stack_ptr, (int) new_top);
 852 }
 853
 854 /**
 855  * Pop all entries from the environment stack until the new_top
 856  * is reached.
 857  *
 858  * @param new_top  the new stack top
 859  */
 860 static void environment_pop_to(size_t new_top)
 861 {
 862         stack_pop_to(&environment_stack, new_top);
 863 }
 864
 865 /**
 866  * Pop all entries from the global label stack until the new_top
 867  * is reached.
 868  *
 869  * @param new_top  the new stack top
 870  */
 871 static void label_pop_to(size_t new_top)
 872 {
 873         stack_pop_to(&label_stack, new_top);
 874 }
 875
 876 /**
 877  * Pop all entries from the local label stack until the new_top
 878  * is reached.
 879  *
 880  * @param new_top  the new stack top
 881  */
 882 static void local_label_pop_to(size_t new_top)
 883 {
 884         stack_pop_to(&local_label_stack, new_top);
 885 }
 886
 887
 888 static int get_akind_rank(atomic_type_kind_t akind)
 889 {
 890         return (int) akind;
 891 }
 892
 893 static int get_rank(const type_t *type)
 894 {
 895         assert(!is_typeref(type));
 896         /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
 897          * and esp. footnote 108). However we can't fold constants (yet), so we
 898          * can't decide whether unsigned int is possible, while int always works.
 899          * (unsigned int would be preferable when possible... for stuff like
 900          *  struct { enum { ... } bla : 4; } ) */
 901         if (type->kind == TYPE_ENUM)
 902                 return get_akind_rank(ATOMIC_TYPE_INT);
 903
 904         assert(type->kind == TYPE_ATOMIC);
 905         return get_akind_rank(type->atomic.akind);
 906 }
 907
 908 static type_t *promote_integer(type_t *type)
 909 {
 910         if (type->kind == TYPE_BITFIELD)
 911                 type = type->bitfield.base_type;
 912
 913         if (get_rank(type) < get_akind_rank(ATOMIC_TYPE_INT))
 914                 type = type_int;
 915
 916         return type;
 917 }
 918
 919 /**
 920  * Create a cast expression.
 921  *
 922  * @param expression  the expression to cast
 923  * @param dest_type   the destination type
 924  */
 925 static expression_t *create_cast_expression(expression_t *expression,
 926                                             type_t *dest_type)
 927 {
 928         expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
 929
 930         cast->unary.value = expression;
 931         cast->base.type   = dest_type;
 932
 933         return cast;
 934 }
 935
 936 /**
 937  * Check if a given expression represents the 0 pointer constant.
 938  */
 939 static bool is_null_pointer_constant(const expression_t *expression)
 940 {
 941         /* skip void* cast */
 942         if (expression->kind == EXPR_UNARY_CAST
 943                         || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 944                 expression = expression->unary.value;
 945         }
 946
 947         /* TODO: not correct yet, should be any constant integer expression
 948          * which evaluates to 0 */
 949         if (expression->kind != EXPR_CONST)
 950                 return false;
 951
 952         type_t *const type = skip_typeref(expression->base.type);
 953         if (!is_type_integer(type))
 954                 return false;
 955
 956         return expression->conste.v.int_value == 0;
 957 }
 958
 959 /**
 960  * Create an implicit cast expression.
 961  *
 962  * @param expression  the expression to cast
 963  * @param dest_type   the destination type
 964  */
 965 static expression_t *create_implicit_cast(expression_t *expression,
 966                                           type_t *dest_type)
 967 {
 968         type_t *const source_type = expression->base.type;
 969
 970         if (source_type == dest_type)
 971                 return expression;
 972
 973         return create_cast_expression(expression, dest_type);
 974 }
 975
 976 typedef enum assign_error_t {
 977         ASSIGN_SUCCESS,
 978         ASSIGN_ERROR_INCOMPATIBLE,
 979         ASSIGN_ERROR_POINTER_QUALIFIER_MISSING,
 980         ASSIGN_WARNING_POINTER_INCOMPATIBLE,
 981         ASSIGN_WARNING_POINTER_FROM_INT,
 982         ASSIGN_WARNING_INT_FROM_POINTER
 983 } assign_error_t;
 984
 985 static void report_assign_error(assign_error_t error, type_t *orig_type_left,
 986                                 const expression_t *const right,
 987                                 const char *context,
 988                                 const source_position_t *source_position)
 989 {
 990         type_t *const orig_type_right = right->base.type;
 991         type_t *const type_left       = skip_typeref(orig_type_left);
 992         type_t *const type_right      = skip_typeref(orig_type_right);
 993
 994         switch (error) {
 995         case ASSIGN_SUCCESS:
 996                 return;
 997         case ASSIGN_ERROR_INCOMPATIBLE:
 998                 errorf(source_position,
 999                        "destination type '%T' in %s is incompatible with type '%T'",
1000                        orig_type_left, context, orig_type_right);
1001                 return;
1002
1003         case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: {
1004                 type_t *points_to_left
1005                         = skip_typeref(type_left->pointer.points_to);
1006                 type_t *points_to_right
1007                         = skip_typeref(type_right->pointer.points_to);
1008
1009                 /* the left type has all qualifiers from the right type */
1010                 unsigned missing_qualifiers
1011                         = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1012                 warningf(source_position,
1013                          "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type",
1014                          orig_type_left, context, orig_type_right, missing_qualifiers);
1015                 return;
1016         }
1017
1018         case ASSIGN_WARNING_POINTER_INCOMPATIBLE:
1019                 warningf(source_position,
1020                          "destination type '%T' in %s is incompatible with '%E' of type '%T'",
1021                                  orig_type_left, context, right, orig_type_right);
1022                 return;
1023
1024         case ASSIGN_WARNING_POINTER_FROM_INT:
1025                 warningf(source_position,
1026                          "%s makes pointer '%T' from integer '%T' without a cast",
1027                                  context, orig_type_left, orig_type_right);
1028                 return;
1029
1030         case ASSIGN_WARNING_INT_FROM_POINTER:
1031                 warningf(source_position,
1032                                 "%s makes integer '%T' from pointer '%T' without a cast",
1033                                 context, orig_type_left, orig_type_right);
1034                 return;
1035
1036         default:
1037                 panic("invalid error value");
1038         }
1039 }
1040
1041 /** Implements the rules from § 6.5.16.1 */
1042 static assign_error_t semantic_assign(type_t *orig_type_left,
1043                                       const expression_t *const right)
1044 {
1045         type_t *const orig_type_right = right->base.type;
1046         type_t *const type_left       = skip_typeref(orig_type_left);
1047         type_t *const type_right      = skip_typeref(orig_type_right);
1048
1049         if (is_type_pointer(type_left)) {
1050                 if (is_null_pointer_constant(right)) {
1051                         return ASSIGN_SUCCESS;
1052                 } else if (is_type_pointer(type_right)) {
1053                         type_t *points_to_left
1054                                 = skip_typeref(type_left->pointer.points_to);
1055                         type_t *points_to_right
1056                                 = skip_typeref(type_right->pointer.points_to);
1057                         assign_error_t res = ASSIGN_SUCCESS;
1058
1059                         /* the left type has all qualifiers from the right type */
1060                         unsigned missing_qualifiers
1061                                 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
1062                         if (missing_qualifiers != 0) {
1063                                 res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING;
1064                         }
1065
1066                         points_to_left  = get_unqualified_type(points_to_left);
1067                         points_to_right = get_unqualified_type(points_to_right);
1068
1069                         if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID) ||
1070                                         is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
1071                                 return res;
1072                         }
1073
1074                         if (!types_compatible(points_to_left, points_to_right)) {
1075                                 return ASSIGN_WARNING_POINTER_INCOMPATIBLE;
1076                         }
1077
1078                         return res;
1079                 } else if (is_type_integer(type_right)) {
1080                         return ASSIGN_WARNING_POINTER_FROM_INT;
1081                 }
1082         } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
1083             (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
1084                 && is_type_pointer(type_right))) {
1085                 return ASSIGN_SUCCESS;
1086         } else if ((is_type_compound(type_left)  && is_type_compound(type_right))
1087                         || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
1088                 type_t *const unqual_type_left  = get_unqualified_type(type_left);
1089                 type_t *const unqual_type_right = get_unqualified_type(type_right);
1090                 if (types_compatible(unqual_type_left, unqual_type_right)) {
1091                         return ASSIGN_SUCCESS;
1092                 }
1093         } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
1094                 return ASSIGN_WARNING_INT_FROM_POINTER;
1095         }
1096
1097         if (!is_type_valid(type_left) || !is_type_valid(type_right))
1098                 return ASSIGN_SUCCESS;
1099
1100         return ASSIGN_ERROR_INCOMPATIBLE;
1101 }
1102
1103 static expression_t *parse_constant_expression(void)
1104 {
1105         /* start parsing at precedence 7 (conditional expression) */
1106         expression_t *result = parse_sub_expression(7);
1107
1108         if (!is_constant_expression(result)) {
1109                 errorf(&result->base.source_position,
1110                        "expression '%E' is not constant\n", result);
1111         }
1112
1113         return result;
1114 }
1115
1116 static expression_t *parse_assignment_expression(void)
1117 {
1118         /* start parsing at precedence 2 (assignment expression) */
1119         return parse_sub_expression(2);
1120 }
1121
1122 static type_t *make_global_typedef(const char *name, type_t *type)
1123 {
1124         symbol_t *const symbol       = symbol_table_insert(name);
1125
1126         declaration_t *const declaration = allocate_declaration_zero();
1127         declaration->namespc                = NAMESPACE_NORMAL;
1128         declaration->storage_class          = STORAGE_CLASS_TYPEDEF;
1129         declaration->declared_storage_class = STORAGE_CLASS_TYPEDEF;
1130         declaration->type                   = type;
1131         declaration->symbol                 = symbol;
1132         declaration->source_position        = builtin_source_position;
1133         declaration->implicit               = true;
1134
1135         record_declaration(declaration, false);
1136
1137         type_t *typedef_type               = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
1138         typedef_type->typedeft.declaration = declaration;
1139
1140         return typedef_type;
1141 }
1142
1143 static string_t parse_string_literals(void)
1144 {
1145         assert(token.type == T_STRING_LITERAL);
1146         string_t result = token.v.string;
1147
1148         next_token();
1149
1150         while (token.type == T_STRING_LITERAL) {
1151                 result = concat_strings(&result, &token.v.string);
1152                 next_token();
1153         }
1154
1155         return result;
1156 }
1157
1158 static const char *const gnu_attribute_names[GNU_AK_LAST] = {
1159         [GNU_AK_CONST]                  = "const",
1160         [GNU_AK_VOLATILE]               = "volatile",
1161         [GNU_AK_CDECL]                  = "cdecl",
1162         [GNU_AK_STDCALL]                = "stdcall",
1163         [GNU_AK_FASTCALL]               = "fastcall",
1164         [GNU_AK_DEPRECATED]             = "deprecated",
1165         [GNU_AK_NOINLINE]               = "noinline",
1166         [GNU_AK_NORETURN]               = "noreturn",
1167         [GNU_AK_NAKED]                  = "naked",
1168         [GNU_AK_PURE]                   = "pure",
1169         [GNU_AK_ALWAYS_INLINE]          = "always_inline",
1170         [GNU_AK_MALLOC]                 = "malloc",
1171         [GNU_AK_WEAK]                   = "weak",
1172         [GNU_AK_CONSTRUCTOR]            = "constructor",
1173         [GNU_AK_DESTRUCTOR]             = "destructor",
1174         [GNU_AK_NOTHROW]                = "nothrow",
1175         [GNU_AK_TRANSPARENT_UNION]      = "transparent_union",
1176         [GNU_AK_COMMON]                 = "common",
1177         [GNU_AK_NOCOMMON]               = "nocommon",
1178         [GNU_AK_PACKED]                 = "packed",
1179         [GNU_AK_SHARED]                 = "shared",
1180         [GNU_AK_NOTSHARED]              = "notshared",
1181         [GNU_AK_USED]                   = "used",
1182         [GNU_AK_UNUSED]                 = "unused",
1183         [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1184         [GNU_AK_WARN_UNUSED_RESULT]     = "warn_unused_result",
1185         [GNU_AK_LONGCALL]               = "longcall",
1186         [GNU_AK_SHORTCALL]              = "shortcall",
1187         [GNU_AK_LONG_CALL]              = "long_call",
1188         [GNU_AK_SHORT_CALL]             = "short_call",
1189         [GNU_AK_FUNCTION_VECTOR]        = "function_vector",
1190         [GNU_AK_INTERRUPT]              = "interrupt",
1191         [GNU_AK_INTERRUPT_HANDLER]      = "interrupt_handler",
1192         [GNU_AK_NMI_HANDLER]            = "nmi_handler",
1193         [GNU_AK_NESTING]                = "nesting",
1194         [GNU_AK_NEAR]                   = "near",
1195         [GNU_AK_FAR]                    = "far",
1196         [GNU_AK_SIGNAL]                 = "signal",
1197         [GNU_AK_EIGTHBIT_DATA]          = "eightbit_data",
1198         [GNU_AK_TINY_DATA]              = "tiny_data",
1199         [GNU_AK_SAVEALL]                = "saveall",
1200         [GNU_AK_FLATTEN]                = "flatten",
1201         [GNU_AK_SSEREGPARM]             = "sseregparm",
1202         [GNU_AK_EXTERNALLY_VISIBLE]     = "externally_visible",
1203         [GNU_AK_RETURN_TWICE]           = "return_twice",
1204         [GNU_AK_MAY_ALIAS]              = "may_alias",
1205         [GNU_AK_MS_STRUCT]              = "ms_struct",
1206         [GNU_AK_GCC_STRUCT]             = "gcc_struct",
1207         [GNU_AK_DLLIMPORT]              = "dllimport",
1208         [GNU_AK_DLLEXPORT]              = "dllexport",
1209         [GNU_AK_ALIGNED]                = "aligned",
1210         [GNU_AK_ALIAS]                  = "alias",
1211         [GNU_AK_SECTION]                = "section",
1212         [GNU_AK_FORMAT]                 = "format",
1213         [GNU_AK_FORMAT_ARG]             = "format_arg",
1214         [GNU_AK_WEAKREF]                = "weakref",
1215         [GNU_AK_NONNULL]                = "nonnull",
1216         [GNU_AK_TLS_MODEL]              = "tls_model",
1217         [GNU_AK_VISIBILITY]             = "visibility",
1218         [GNU_AK_REGPARM]                = "regparm",
1219         [GNU_AK_MODE]                   = "mode",
1220         [GNU_AK_MODEL]                  = "model",
1221         [GNU_AK_TRAP_EXIT]              = "trap_exit",
1222         [GNU_AK_SP_SWITCH]              = "sp_switch",
1223         [GNU_AK_SENTINEL]               = "sentinel"
1224 };
1225
1226 /**
1227  * compare two string, ignoring double underscores on the second.
1228  */
1229 static int strcmp_underscore(const char *s1, const char *s2)
1230 {
1231         if (s2[0] == '_' && s2[1] == '_') {
1232                 size_t len2 = strlen(s2);
1233                 size_t len1 = strlen(s1);
1234                 if (len1 == len2-4 && s2[len2-2] == '_' && s2[len2-1] == '_') {
1235                         return strncmp(s1, s2+2, len2-4);
1236                 }
1237         }
1238
1239         return strcmp(s1, s2);
1240 }
1241
1242 /**
1243  * Allocate a new gnu temporal attribute.
1244  */
1245 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind)
1246 {
1247         gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1248         attribute->kind            = kind;
1249         attribute->next            = NULL;
1250         attribute->invalid         = false;
1251         attribute->have_arguments  = false;
1252
1253         return attribute;
1254 }
1255
1256 /**
1257  * parse one constant expression argument.
1258  */
1259 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute)
1260 {
1261         expression_t *expression;
1262         add_anchor_token(')');
1263         expression = parse_constant_expression();
1264         rem_anchor_token(')');
1265         expect(')');
1266         attribute->u.argument = fold_constant(expression);
1267         return;
1268 end_error:
1269         attribute->invalid = true;
1270 }
1271
1272 /**
1273  * parse a list of constant expressions arguments.
1274  */
1275 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute)
1276 {
1277         argument_list_t **list = &attribute->u.arguments;
1278         argument_list_t  *entry;
1279         expression_t     *expression;
1280         add_anchor_token(')');
1281         add_anchor_token(',');
1282         while (true) {
1283                 expression = parse_constant_expression();
1284                 entry = obstack_alloc(&temp_obst, sizeof(entry));
1285                 entry->argument = fold_constant(expression);
1286                 entry->next     = NULL;
1287                 *list = entry;
1288                 list = &entry->next;
1289                 if (token.type != ',')
1290                         break;
1291                 next_token();
1292         }
1293         rem_anchor_token(',');
1294         rem_anchor_token(')');
1295         expect(')');
1296         return;
1297 end_error:
1298         attribute->invalid = true;
1299 }
1300
1301 /**
1302  * parse one string literal argument.
1303  */
1304 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1305                                            string_t *string)
1306 {
1307         add_anchor_token('(');
1308         if (token.type != T_STRING_LITERAL) {
1309                 parse_error_expected("while parsing attribute directive",
1310                                      T_STRING_LITERAL, NULL);
1311                 goto end_error;
1312         }
1313         *string = parse_string_literals();
1314         rem_anchor_token('(');
1315         expect(')');
1316         return;
1317 end_error:
1318         attribute->invalid = true;
1319 }
1320
1321 /**
1322  * parse one tls model.
1323  */
1324 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute)
1325 {
1326         static const char *const tls_models[] = {
1327                 "global-dynamic",
1328                 "local-dynamic",
1329                 "initial-exec",
1330                 "local-exec"
1331         };
1332         string_t string = { NULL, 0 };
1333         parse_gnu_attribute_string_arg(attribute, &string);
1334         if (string.begin != NULL) {
1335                 for(size_t i = 0; i < 4; ++i) {
1336                         if (strcmp(tls_models[i], string.begin) == 0) {
1337                                 attribute->u.value = i;
1338                                 return;
1339                         }
1340                 }
1341                 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1342         }
1343         attribute->invalid = true;
1344 }
1345
1346 /**
1347  * parse one tls model.
1348  */
1349 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute)
1350 {
1351         static const char *const visibilities[] = {
1352                 "default",
1353                 "protected",
1354                 "hidden",
1355                 "internal"
1356         };
1357         string_t string = { NULL, 0 };
1358         parse_gnu_attribute_string_arg(attribute, &string);
1359         if (string.begin != NULL) {
1360                 for(size_t i = 0; i < 4; ++i) {
1361                         if (strcmp(visibilities[i], string.begin) == 0) {
1362                                 attribute->u.value = i;
1363                                 return;
1364                         }
1365                 }
1366                 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1367         }
1368         attribute->invalid = true;
1369 }
1370
1371 /**
1372  * parse one (code) model.
1373  */
1374 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute)
1375 {
1376         static const char *const visibilities[] = {
1377                 "small",
1378                 "medium",
1379                 "large"
1380         };
1381         string_t string = { NULL, 0 };
1382         parse_gnu_attribute_string_arg(attribute, &string);
1383         if (string.begin != NULL) {
1384                 for(int i = 0; i < 3; ++i) {
1385                         if (strcmp(visibilities[i], string.begin) == 0) {
1386                                 attribute->u.value = i;
1387                                 return;
1388                         }
1389                 }
1390                 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1391         }
1392         attribute->invalid = true;
1393 }
1394
1395 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1396 {
1397         /* TODO: find out what is allowed here... */
1398
1399         /* at least: byte, word, pointer, list of machine modes
1400          * __XXX___ is interpreted as XXX */
1401         add_anchor_token(')');
1402
1403         if (token.type != T_IDENTIFIER) {
1404                 expect(T_IDENTIFIER);
1405         }
1406
1407         /* This isn't really correct, the backend should provide a list of machine
1408          * specific modes (according to gcc philosophy that is...) */
1409         const char *symbol_str = token.v.symbol->string;
1410         if (strcmp_underscore("QI",   symbol_str) == 0 ||
1411             strcmp_underscore("byte", symbol_str) == 0) {
1412                 attribute->u.akind = ATOMIC_TYPE_CHAR;
1413         } else if (strcmp_underscore("HI", symbol_str) == 0) {
1414                 attribute->u.akind = ATOMIC_TYPE_SHORT;
1415         } else if (strcmp_underscore("SI",      symbol_str) == 0
1416                 || strcmp_underscore("word",    symbol_str) == 0
1417                 || strcmp_underscore("pointer", symbol_str) == 0) {
1418                 attribute->u.akind = ATOMIC_TYPE_INT;
1419         } else if (strcmp_underscore("DI", symbol_str) == 0) {
1420                 attribute->u.akind = ATOMIC_TYPE_LONGLONG;
1421         } else {
1422                 warningf(HERE, "ignoring unknown mode '%s'", symbol_str);
1423                 attribute->invalid = true;
1424         }
1425         next_token();
1426
1427         rem_anchor_token(')');
1428         expect(')');
1429         return;
1430 end_error:
1431         attribute->invalid = true;
1432 }
1433
1434 /**
1435  * parse one interrupt argument.
1436  */
1437 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute)
1438 {
1439         static const char *const interrupts[] = {
1440                 "IRQ",
1441                 "FIQ",
1442                 "SWI",
1443                 "ABORT",
1444                 "UNDEF"
1445         };
1446         string_t string = { NULL, 0 };
1447         parse_gnu_attribute_string_arg(attribute, &string);
1448         if (string.begin != NULL) {
1449                 for(size_t i = 0; i < 5; ++i) {
1450                         if (strcmp(interrupts[i], string.begin) == 0) {
1451                                 attribute->u.value = i;
1452                                 return;
1453                         }
1454                 }
1455                 errorf(HERE, "'%s' is not an interrupt", string.begin);
1456         }
1457         attribute->invalid = true;
1458 }
1459
1460 /**
1461  * parse ( identifier, const expression, const expression )
1462  */
1463 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute)
1464 {
1465         static const char *const format_names[] = {
1466                 "printf",
1467                 "scanf",
1468                 "strftime",
1469                 "strfmon"
1470         };
1471         int i;
1472
1473         if (token.type != T_IDENTIFIER) {
1474                 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1475                 goto end_error;
1476         }
1477         const char *name = token.v.symbol->string;
1478         for(i = 0; i < 4; ++i) {
1479                 if (strcmp_underscore(format_names[i], name) == 0)
1480                         break;
1481         }
1482         if (i >= 4) {
1483                 if (warning.attribute)
1484                         warningf(HERE, "'%s' is an unrecognized format function type", name);
1485         }
1486         next_token();
1487
1488         expect(',');
1489         add_anchor_token(')');
1490         add_anchor_token(',');
1491         parse_constant_expression();
1492         rem_anchor_token(',');
1493         rem_anchor_token(')');
1494
1495         expect(',');
1496         add_anchor_token(')');
1497         parse_constant_expression();
1498         rem_anchor_token(')');
1499         expect(')');
1500         return;
1501 end_error:
1502         attribute->u.value = true;
1503 }
1504
1505 static void check_no_argument(gnu_attribute_t *attribute, const char *name)
1506 {
1507         if (!attribute->have_arguments)
1508                 return;
1509
1510         /* should have no arguments */
1511         errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1512         eat_until_matching_token('(');
1513         /* we have already consumed '(', so we stop before ')', eat it */
1514         eat(')');
1515         attribute->invalid = true;
1516 }
1517
1518 /**
1519  * Parse one GNU attribute.
1520  *
1521  * Note that attribute names can be specified WITH or WITHOUT
1522  * double underscores, ie const or __const__.
1523  *
1524  * The following attributes are parsed without arguments
1525  *  const
1526  *  volatile
1527  *  cdecl
1528  *  stdcall
1529  *  fastcall
1530  *  deprecated
1531  *  noinline
1532  *  noreturn
1533  *  naked
1534  *  pure
1535  *  always_inline
1536  *  malloc
1537  *  weak
1538  *  constructor
1539  *  destructor
1540  *  nothrow
1541  *  transparent_union
1542  *  common
1543  *  nocommon
1544  *  packed
1545  *  shared
1546  *  notshared
1547  *  used
1548  *  unused
1549  *  no_instrument_function
1550  *  warn_unused_result
1551  *  longcall
1552  *  shortcall
1553  *  long_call
1554  *  short_call
1555  *  function_vector
1556  *  interrupt_handler
1557  *  nmi_handler
1558  *  nesting
1559  *  near
1560  *  far
1561  *  signal
1562  *  eightbit_data
1563  *  tiny_data
1564  *  saveall
1565  *  flatten
1566  *  sseregparm
1567  *  externally_visible
1568  *  return_twice
1569  *  may_alias
1570  *  ms_struct
1571  *  gcc_struct
1572  *  dllimport
1573  *  dllexport
1574  *
1575  * The following attributes are parsed with arguments
1576  *  aligned( const expression )
1577  *  alias( string literal )
1578  *  section( string literal )
1579  *  format( identifier, const expression, const expression )
1580  *  format_arg( const expression )
1581  *  tls_model( string literal )
1582  *  visibility( string literal )
1583  *  regparm( const expression )
1584  *  model( string leteral )
1585  *  trap_exit( const expression )
1586  *  sp_switch( string literal )
1587  *
1588  * The following attributes might have arguments
1589  *  weak_ref( string literal )
1590  *  non_null( const expression // ',' )
1591  *  interrupt( string literal )
1592  *  sentinel( constant expression )
1593  */
1594 static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes)
1595 {
1596         gnu_attribute_t *head      = *attributes;
1597         gnu_attribute_t *last      = *attributes;
1598         decl_modifiers_t modifiers = 0;
1599         gnu_attribute_t *attribute;
1600
1601         eat(T___attribute__);
1602         expect('(');
1603         expect('(');
1604
1605         if (token.type != ')') {
1606                 /* find the end of the list */
1607                 if (last != NULL) {
1608                         while (last->next != NULL)
1609                                 last = last->next;
1610                 }
1611
1612                 /* non-empty attribute list */
1613                 while (true) {
1614                         const char *name;
1615                         if (token.type == T_const) {
1616                                 name = "const";
1617                         } else if (token.type == T_volatile) {
1618                                 name = "volatile";
1619                         } else if (token.type == T_cdecl) {
1620                                 /* __attribute__((cdecl)), WITH ms mode */
1621                                 name = "cdecl";
1622                         } else if (token.type == T_IDENTIFIER) {
1623                                 const symbol_t *sym = token.v.symbol;
1624                                 name = sym->string;
1625                         } else {
1626                                 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1627                                 break;
1628                         }
1629
1630                         next_token();
1631
1632                         int i;
1633                         for(i = 0; i < GNU_AK_LAST; ++i) {
1634                                 if (strcmp_underscore(gnu_attribute_names[i], name) == 0)
1635                                         break;
1636                         }
1637                         gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1638
1639                         attribute = NULL;
1640                         if (kind == GNU_AK_LAST) {
1641                                 if (warning.attribute)
1642                                         warningf(HERE, "'%s' attribute directive ignored", name);
1643
1644                                 /* skip possible arguments */
1645                                 if (token.type == '(') {
1646                                         eat_until_matching_token(')');
1647                                 }
1648                         } else {
1649                                 /* check for arguments */
1650                                 attribute = allocate_gnu_attribute(kind);
1651                                 if (token.type == '(') {
1652                                         next_token();
1653                                         if (token.type == ')') {
1654                                                 /* empty args are allowed */
1655                                                 next_token();
1656                                         } else
1657                                                 attribute->have_arguments = true;
1658                                 }
1659
1660                                 switch(kind) {
1661                                 case GNU_AK_VOLATILE:
1662                                 case GNU_AK_NAKED:
1663                                 case GNU_AK_MALLOC:
1664                                 case GNU_AK_WEAK:
1665                                 case GNU_AK_COMMON:
1666                                 case GNU_AK_NOCOMMON:
1667                                 case GNU_AK_SHARED:
1668                                 case GNU_AK_NOTSHARED:
1669                                 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1670                                 case GNU_AK_WARN_UNUSED_RESULT:
1671                                 case GNU_AK_LONGCALL:
1672                                 case GNU_AK_SHORTCALL:
1673                                 case GNU_AK_LONG_CALL:
1674                                 case GNU_AK_SHORT_CALL:
1675                                 case GNU_AK_FUNCTION_VECTOR:
1676                                 case GNU_AK_INTERRUPT_HANDLER:
1677                                 case GNU_AK_NMI_HANDLER:
1678                                 case GNU_AK_NESTING:
1679                                 case GNU_AK_NEAR:
1680                                 case GNU_AK_FAR:
1681                                 case GNU_AK_SIGNAL:
1682                                 case GNU_AK_EIGTHBIT_DATA:
1683                                 case GNU_AK_TINY_DATA:
1684                                 case GNU_AK_SAVEALL:
1685                                 case GNU_AK_FLATTEN:
1686                                 case GNU_AK_SSEREGPARM:
1687                                 case GNU_AK_EXTERNALLY_VISIBLE:
1688                                 case GNU_AK_RETURN_TWICE:
1689                                 case GNU_AK_MAY_ALIAS:
1690                                 case GNU_AK_MS_STRUCT:
1691                                 case GNU_AK_GCC_STRUCT:
1692                                         goto no_arg;
1693
1694                                 case GNU_AK_CDECL:             modifiers |= DM_CDECL;             goto no_arg;
1695                                 case GNU_AK_FASTCALL:          modifiers |= DM_FASTCALL;          goto no_arg;
1696                                 case GNU_AK_STDCALL:           modifiers |= DM_STDCALL;           goto no_arg;
1697                                 case GNU_AK_UNUSED:            modifiers |= DM_UNUSED;            goto no_arg;
1698                                 case GNU_AK_USED:              modifiers |= DM_USED;              goto no_arg;
1699                                 case GNU_AK_PURE:              modifiers |= DM_PURE;              goto no_arg;
1700                                 case GNU_AK_CONST:             modifiers |= DM_CONST;             goto no_arg;
1701                                 case GNU_AK_ALWAYS_INLINE:     modifiers |= DM_FORCEINLINE;       goto no_arg;
1702                                 case GNU_AK_DLLIMPORT:         modifiers |= DM_DLLIMPORT;         goto no_arg;
1703                                 case GNU_AK_DLLEXPORT:         modifiers |= DM_DLLEXPORT;         goto no_arg;
1704                                 case GNU_AK_PACKED:            modifiers |= DM_PACKED;            goto no_arg;
1705                                 case GNU_AK_NOINLINE:          modifiers |= DM_NOINLINE;          goto no_arg;
1706                                 case GNU_AK_NORETURN:          modifiers |= DM_NORETURN;          goto no_arg;
1707                                 case GNU_AK_NOTHROW:           modifiers |= DM_NOTHROW;           goto no_arg;
1708                                 case GNU_AK_TRANSPARENT_UNION: modifiers |= DM_TRANSPARENT_UNION; goto no_arg;
1709                                 case GNU_AK_CONSTRUCTOR:       modifiers |= DM_CONSTRUCTOR;       goto no_arg;
1710                                 case GNU_AK_DESTRUCTOR:        modifiers |= DM_DESTRUCTOR;        goto no_arg;
1711                                 case GNU_AK_DEPRECATED:        modifiers |= DM_DEPRECATED;        goto no_arg;
1712
1713                                 case GNU_AK_ALIGNED:
1714                                         /* __align__ may be used without an argument */
1715                                         if (attribute->have_arguments) {
1716                                                 parse_gnu_attribute_const_arg(attribute);
1717                                         }
1718                                         break;
1719
1720                                 case GNU_AK_FORMAT_ARG:
1721                                 case GNU_AK_REGPARM:
1722                                 case GNU_AK_TRAP_EXIT:
1723                                         if (!attribute->have_arguments) {
1724                                                 /* should have arguments */
1725                                                 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1726                                                 attribute->invalid = true;
1727                                         } else
1728                                                 parse_gnu_attribute_const_arg(attribute);
1729                                         break;
1730                                 case GNU_AK_ALIAS:
1731                                 case GNU_AK_SECTION:
1732                                 case GNU_AK_SP_SWITCH:
1733                                         if (!attribute->have_arguments) {
1734                                                 /* should have arguments */
1735                                                 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1736                                                 attribute->invalid = true;
1737                                         } else
1738                                                 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1739                                         break;
1740                                 case GNU_AK_FORMAT:
1741                                         if (!attribute->have_arguments) {
1742                                                 /* should have arguments */
1743                                                 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1744                                                 attribute->invalid = true;
1745                                         } else
1746                                                 parse_gnu_attribute_format_args(attribute);
1747                                         break;
1748                                 case GNU_AK_WEAKREF:
1749                                         /* may have one string argument */
1750                                         if (attribute->have_arguments)
1751                                                 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1752                                         break;
1753                                 case GNU_AK_NONNULL:
1754                                         if (attribute->have_arguments)
1755                                                 parse_gnu_attribute_const_arg_list(attribute);
1756                                         break;
1757                                 case GNU_AK_TLS_MODEL:
1758                                         if (!attribute->have_arguments) {
1759                                                 /* should have arguments */
1760                                                 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1761                                         } else
1762                                                 parse_gnu_attribute_tls_model_arg(attribute);
1763                                         break;
1764                                 case GNU_AK_VISIBILITY:
1765                                         if (!attribute->have_arguments) {
1766                                                 /* should have arguments */
1767                                                 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1768                                         } else
1769                                                 parse_gnu_attribute_visibility_arg(attribute);
1770                                         break;
1771                                 case GNU_AK_MODEL:
1772                                         if (!attribute->have_arguments) {
1773                                                 /* should have arguments */
1774                                                 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1775                                         } else {
1776                                                 parse_gnu_attribute_model_arg(attribute);
1777                                         }
1778                                         break;
1779                                 case GNU_AK_MODE:
1780                                         if (!attribute->have_arguments) {
1781                                                 /* should have arguments */
1782                                                 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1783                                         } else {
1784                                                 parse_gnu_attribute_mode_arg(attribute);
1785                                         }
1786                                         break;
1787                                 case GNU_AK_INTERRUPT:
1788                                         /* may have one string argument */
1789                                         if (attribute->have_arguments)
1790                                                 parse_gnu_attribute_interrupt_arg(attribute);
1791                                         break;
1792                                 case GNU_AK_SENTINEL:
1793                                         /* may have one string argument */
1794                                         if (attribute->have_arguments)
1795                                                 parse_gnu_attribute_const_arg(attribute);
1796                                         break;
1797                                 case GNU_AK_LAST:
1798                                         /* already handled */
1799                                         break;
1800
1801 no_arg:
1802                                         check_no_argument(attribute, name);
1803                                 }
1804                         }
1805                         if (attribute != NULL) {
1806                                 if (last != NULL) {
1807                                         last->next = attribute;
1808                                         last       = attribute;
1809                                 } else {
1810                                         head = last = attribute;
1811                                 }
1812                         }
1813
1814                         if (token.type != ',')
1815                                 break;
1816                         next_token();
1817                 }
1818         }
1819         expect(')');
1820         expect(')');
1821 end_error:
1822         *attributes = head;
1823
1824         return modifiers;
1825 }
1826
1827 /**
1828  * Parse GNU attributes.
1829  */
1830 static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes)
1831 {
1832         decl_modifiers_t modifiers = 0;
1833
1834         while (true) {
1835                 switch(token.type) {
1836                 case T___attribute__:
1837                         modifiers |= parse_gnu_attribute(attributes);
1838                         continue;
1839
1840                 case T_asm:
1841                         next_token();
1842                         expect('(');
1843                         if (token.type != T_STRING_LITERAL) {
1844                                 parse_error_expected("while parsing assembler attribute",
1845                                                      T_STRING_LITERAL, NULL);
1846                                 eat_until_matching_token('(');
1847                                 break;
1848                         } else {
1849                                 parse_string_literals();
1850                         }
1851                         expect(')');
1852                         continue;
1853
1854                 case T_cdecl:     modifiers |= DM_CDECL;    break;
1855                 case T__fastcall: modifiers |= DM_FASTCALL; break;
1856                 case T__stdcall:  modifiers |= DM_STDCALL;  break;
1857
1858                 case T___thiscall:
1859                         /* TODO record modifier */
1860                         warningf(HERE, "Ignoring declaration modifier %K", &token);
1861                         break;
1862
1863 end_error:
1864                 default: return modifiers;
1865                 }
1866
1867                 next_token();
1868         }
1869 }
1870
1871 static designator_t *parse_designation(void)
1872 {
1873         designator_t *result = NULL;
1874         designator_t *last   = NULL;
1875
1876         while (true) {
1877                 designator_t *designator;
1878                 switch(token.type) {
1879                 case '[':
1880                         designator = allocate_ast_zero(sizeof(designator[0]));
1881                         designator->source_position = token.source_position;
1882                         next_token();
1883                         add_anchor_token(']');
1884                         designator->array_index = parse_constant_expression();
1885                         rem_anchor_token(']');
1886                         expect(']');
1887                         break;
1888                 case '.':
1889                         designator = allocate_ast_zero(sizeof(designator[0]));
1890                         designator->source_position = token.source_position;
1891                         next_token();
1892                         if (token.type != T_IDENTIFIER) {
1893                                 parse_error_expected("while parsing designator",
1894                                                      T_IDENTIFIER, NULL);
1895                                 return NULL;
1896                         }
1897                         designator->symbol = token.v.symbol;
1898                         next_token();
1899                         break;
1900                 default:
1901                         expect('=');
1902                         return result;
1903                 }
1904
1905                 assert(designator != NULL);
1906                 if (last != NULL) {
1907                         last->next = designator;
1908                 } else {
1909                         result = designator;
1910                 }
1911                 last = designator;
1912         }
1913 end_error:
1914         return NULL;
1915 }
1916
1917 static initializer_t *initializer_from_string(array_type_t *type,
1918                                               const string_t *const string)
1919 {
1920         /* TODO: check len vs. size of array type */
1921         (void) type;
1922
1923         initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1924         initializer->string.string = *string;
1925
1926         return initializer;
1927 }
1928
1929 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1930                                                    wide_string_t *const string)
1931 {
1932         /* TODO: check len vs. size of array type */
1933         (void) type;
1934
1935         initializer_t *const initializer =
1936                 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1937         initializer->wide_string.string = *string;
1938
1939         return initializer;
1940 }
1941
1942 /**
1943  * Build an initializer from a given expression.
1944  */
1945 static initializer_t *initializer_from_expression(type_t *orig_type,
1946                                                   expression_t *expression)
1947 {
1948         /* TODO check that expression is a constant expression */
1949
1950         /* § 6.7.8.14/15 char array may be initialized by string literals */
1951         type_t *type           = skip_typeref(orig_type);
1952         type_t *expr_type_orig = expression->base.type;
1953         type_t *expr_type      = skip_typeref(expr_type_orig);
1954         if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1955                 array_type_t *const array_type   = &type->array;
1956                 type_t       *const element_type = skip_typeref(array_type->element_type);
1957
1958                 if (element_type->kind == TYPE_ATOMIC) {
1959                         atomic_type_kind_t akind = element_type->atomic.akind;
1960                         switch (expression->kind) {
1961                                 case EXPR_STRING_LITERAL:
1962                                         if (akind == ATOMIC_TYPE_CHAR
1963                                                         || akind == ATOMIC_TYPE_SCHAR
1964                                                         || akind == ATOMIC_TYPE_UCHAR) {
1965                                                 return initializer_from_string(array_type,
1966                                                         &expression->string.value);
1967                                         }
1968
1969                                 case EXPR_WIDE_STRING_LITERAL: {
1970                                         type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1971                                         if (get_unqualified_type(element_type) == bare_wchar_type) {
1972                                                 return initializer_from_wide_string(array_type,
1973                                                         &expression->wide_string.value);
1974                                         }
1975                                 }
1976
1977                                 default:
1978                                         break;
1979                         }
1980                 }
1981         }
1982
1983         assign_error_t error = semantic_assign(type, expression);
1984         if (error == ASSIGN_ERROR_INCOMPATIBLE)
1985                 return NULL;
1986         report_assign_error(error, type, expression, "initializer",
1987                             &expression->base.source_position);
1988
1989         initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1990         result->value.value = create_implicit_cast(expression, type);
1991
1992         return result;
1993 }
1994
1995 /**
1996  * Checks if a given expression can be used as an constant initializer.
1997  */
1998 static bool is_initializer_constant(const expression_t *expression)
1999 {
2000         return is_constant_expression(expression)
2001                 || is_address_constant(expression);
2002 }
2003
2004 /**
2005  * Parses an scalar initializer.
2006  *
2007  * § 6.7.8.11; eat {} without warning
2008  */
2009 static initializer_t *parse_scalar_initializer(type_t *type,
2010                                                bool must_be_constant)
2011 {
2012         /* there might be extra {} hierarchies */
2013         int braces = 0;
2014         if (token.type == '{') {
2015                 warningf(HERE, "extra curly braces around scalar initializer");
2016                 do {
2017                         ++braces;
2018                         next_token();
2019                 } while (token.type == '{');
2020         }
2021
2022         expression_t *expression = parse_assignment_expression();
2023         if (must_be_constant && !is_initializer_constant(expression)) {
2024                 errorf(&expression->base.source_position,
2025                        "Initialisation expression '%E' is not constant\n",
2026                        expression);
2027         }
2028
2029         initializer_t *initializer = initializer_from_expression(type, expression);
2030
2031         if (initializer == NULL) {
2032                 errorf(&expression->base.source_position,
2033                        "expression '%E' (type '%T') doesn't match expected type '%T'",
2034                        expression, expression->base.type, type);
2035                 /* TODO */
2036                 return NULL;
2037         }
2038
2039         bool additional_warning_displayed = false;
2040         while (braces > 0) {
2041                 if (token.type == ',') {
2042                         next_token();
2043                 }
2044                 if (token.type != '}') {
2045                         if (!additional_warning_displayed) {
2046                                 warningf(HERE, "additional elements in scalar initializer");
2047                                 additional_warning_displayed = true;
2048                         }
2049                 }
2050                 eat_block();
2051                 braces--;
2052         }
2053
2054         return initializer;
2055 }
2056
2057 /**
2058  * An entry in the type path.
2059  */
2060 typedef struct type_path_entry_t type_path_entry_t;
2061 struct type_path_entry_t {
2062         type_t *type;       /**< the upper top type. restored to path->top_tye if this entry is popped. */
2063         union {
2064                 size_t         index;          /**< For array types: the current index. */
2065                 declaration_t *compound_entry; /**< For compound types: the current declaration. */
2066         } v;
2067 };
2068
2069 /**
2070  * A type path expression a position inside compound or array types.
2071  */
2072 typedef struct type_path_t type_path_t;
2073 struct type_path_t {
2074         type_path_entry_t *path;         /**< An flexible array containing the current path. */
2075         type_t            *top_type;     /**< type of the element the path points */
2076         size_t             max_index;    /**< largest index in outermost array */
2077 };
2078
2079 /**
2080  * Prints a type path for debugging.
2081  */
2082 static __attribute__((unused)) void debug_print_type_path(
2083                 const type_path_t *path)
2084 {
2085         size_t len = ARR_LEN(path->path);
2086
2087         for(size_t i = 0; i < len; ++i) {
2088                 const type_path_entry_t *entry = & path->path[i];
2089
2090                 type_t *type = skip_typeref(entry->type);
2091                 if (is_type_compound(type)) {
2092                         /* in gcc mode structs can have no members */
2093                         if (entry->v.compound_entry == NULL) {
2094                                 assert(i == len-1);
2095                                 continue;
2096                         }
2097                         fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string);
2098                 } else if (is_type_array(type)) {
2099                         fprintf(stderr, "[%zu]", entry->v.index);
2100                 } else {
2101                         fprintf(stderr, "-INVALID-");
2102                 }
2103         }
2104         if (path->top_type != NULL) {
2105                 fprintf(stderr, "  (");
2106                 print_type(path->top_type);
2107                 fprintf(stderr, ")");
2108         }
2109 }
2110
2111 /**
2112  * Return the top type path entry, ie. in a path
2113  * (type).a.b returns the b.
2114  */
2115 static type_path_entry_t *get_type_path_top(const type_path_t *path)
2116 {
2117         size_t len = ARR_LEN(path->path);
2118         assert(len > 0);
2119         return &path->path[len-1];
2120 }
2121
2122 /**
2123  * Enlarge the type path by an (empty) element.
2124  */
2125 static type_path_entry_t *append_to_type_path(type_path_t *path)
2126 {
2127         size_t len = ARR_LEN(path->path);
2128         ARR_RESIZE(type_path_entry_t, path->path, len+1);
2129
2130         type_path_entry_t *result = & path->path[len];
2131         memset(result, 0, sizeof(result[0]));
2132         return result;
2133 }
2134
2135 /**
2136  * Descending into a sub-type. Enter the scope of the current
2137  * top_type.
2138  */
2139 static void descend_into_subtype(type_path_t *path)
2140 {
2141         type_t *orig_top_type = path->top_type;
2142         type_t *top_type      = skip_typeref(orig_top_type);
2143
2144         type_path_entry_t *top = append_to_type_path(path);
2145         top->type              = top_type;
2146
2147         if (is_type_compound(top_type)) {
2148                 declaration_t *declaration = top_type->compound.declaration;
2149                 declaration_t *entry       = declaration->scope.declarations;
2150                 top->v.compound_entry      = entry;
2151
2152                 if (entry != NULL) {
2153                         path->top_type         = entry->type;
2154                 } else {
2155                         path->top_type         = NULL;
2156                 }
2157         } else if (is_type_array(top_type)) {
2158                 top->v.index   = 0;
2159                 path->top_type = top_type->array.element_type;
2160         } else {
2161                 assert(!is_type_valid(top_type));
2162         }
2163 }
2164
2165 /**
2166  * Pop an entry from the given type path, ie. returning from
2167  * (type).a.b to (type).a
2168  */
2169 static void ascend_from_subtype(type_path_t *path)
2170 {
2171         type_path_entry_t *top = get_type_path_top(path);
2172
2173         path->top_type = top->type;
2174
2175         size_t len = ARR_LEN(path->path);
2176         ARR_RESIZE(type_path_entry_t, path->path, len-1);
2177 }
2178
2179 /**
2180  * Pop entries from the given type path until the given
2181  * path level is reached.
2182  */
2183 static void ascend_to(type_path_t *path, size_t top_path_level)
2184 {
2185         size_t len = ARR_LEN(path->path);
2186
2187         while (len > top_path_level) {
2188                 ascend_from_subtype(path);
2189                 len = ARR_LEN(path->path);
2190         }
2191 }
2192
2193 static bool walk_designator(type_path_t *path, const designator_t *designator,
2194                             bool used_in_offsetof)
2195 {
2196         for( ; designator != NULL; designator = designator->next) {
2197                 type_path_entry_t *top       = get_type_path_top(path);
2198                 type_t            *orig_type = top->type;
2199
2200                 type_t *type = skip_typeref(orig_type);
2201
2202                 if (designator->symbol != NULL) {
2203                         symbol_t *symbol = designator->symbol;
2204                         if (!is_type_compound(type)) {
2205                                 if (is_type_valid(type)) {
2206                                         errorf(&designator->source_position,
2207                                                "'.%Y' designator used for non-compound type '%T'",
2208                                                symbol, orig_type);
2209                                 }
2210
2211                                 top->type             = type_error_type;
2212                                 top->v.compound_entry = NULL;
2213                                 orig_type             = type_error_type;
2214                         } else {
2215                                 declaration_t *declaration = type->compound.declaration;
2216                                 declaration_t *iter        = declaration->scope.declarations;
2217                                 for( ; iter != NULL; iter = iter->next) {
2218                                         if (iter->symbol == symbol) {
2219                                                 break;
2220                                         }
2221                                 }
2222                                 if (iter == NULL) {
2223                                         errorf(&designator->source_position,
2224                                                "'%T' has no member named '%Y'", orig_type, symbol);
2225                                         goto failed;
2226                                 }
2227                                 if (used_in_offsetof) {
2228                                         type_t *real_type = skip_typeref(iter->type);
2229                                         if (real_type->kind == TYPE_BITFIELD) {
2230                                                 errorf(&designator->source_position,
2231                                                        "offsetof designator '%Y' may not specify bitfield",
2232                                                        symbol);
2233                                                 goto failed;
2234                                         }
2235                                 }
2236
2237                                 top->type             = orig_type;
2238                                 top->v.compound_entry = iter;
2239                                 orig_type             = iter->type;
2240                         }
2241                 } else {
2242                         expression_t *array_index = designator->array_index;
2243                         assert(designator->array_index != NULL);
2244
2245                         if (!is_type_array(type)) {
2246                                 if (is_type_valid(type)) {
2247                                         errorf(&designator->source_position,
2248                                                "[%E] designator used for non-array type '%T'",
2249                                                array_index, orig_type);
2250                                 }
2251                                 goto failed;
2252                         }
2253
2254                         long index = fold_constant(array_index);
2255                         if (!used_in_offsetof) {
2256                                 if (index < 0) {
2257                                         errorf(&designator->source_position,
2258                                                "array index [%E] must be positive", array_index);
2259                                 } else if (type->array.size_constant) {
2260                                         long array_size = type->array.size;
2261                                         if (index >= array_size) {
2262                                                 errorf(&designator->source_position,
2263                                                        "designator [%E] (%d) exceeds array size %d",
2264                                                        array_index, index, array_size);
2265                                         }
2266                                 }
2267                         }
2268
2269                         top->type    = orig_type;
2270                         top->v.index = (size_t) index;
2271                         orig_type    = type->array.element_type;
2272                 }
2273                 path->top_type = orig_type;
2274
2275                 if (designator->next != NULL) {
2276                         descend_into_subtype(path);
2277                 }
2278         }
2279         return true;
2280
2281 failed:
2282         return false;
2283 }
2284
2285 static void advance_current_object(type_path_t *path, size_t top_path_level)
2286 {
2287         type_path_entry_t *top = get_type_path_top(path);
2288
2289         type_t *type = skip_typeref(top->type);
2290         if (is_type_union(type)) {
2291                 /* in unions only the first element is initialized */
2292                 top->v.compound_entry = NULL;
2293         } else if (is_type_struct(type)) {
2294                 declaration_t *entry = top->v.compound_entry;
2295
2296                 entry                 = entry->next;
2297                 top->v.compound_entry = entry;
2298                 if (entry != NULL) {
2299                         path->top_type = entry->type;
2300                         return;
2301                 }
2302         } else if (is_type_array(type)) {
2303                 assert(is_type_array(type));
2304
2305                 top->v.index++;
2306
2307                 if (!type->array.size_constant || top->v.index < type->array.size) {
2308                         return;
2309                 }
2310         } else {
2311                 assert(!is_type_valid(type));
2312                 return;
2313         }
2314
2315         /* we're past the last member of the current sub-aggregate, try if we
2316          * can ascend in the type hierarchy and continue with another subobject */
2317         size_t len = ARR_LEN(path->path);
2318
2319         if (len > top_path_level) {
2320                 ascend_from_subtype(path);
2321                 advance_current_object(path, top_path_level);
2322         } else {
2323                 path->top_type = NULL;
2324         }
2325 }
2326
2327 /**
2328  * skip until token is found.
2329  */
2330 static void skip_until(int type)
2331 {
2332         while (token.type != type) {
2333                 if (token.type == T_EOF)
2334                         return;
2335                 next_token();
2336         }
2337 }
2338
2339 /**
2340  * skip any {...} blocks until a closing bracket is reached.
2341  */
2342 static void skip_initializers(void)
2343 {
2344         if (token.type == '{')
2345                 next_token();
2346
2347         while (token.type != '}') {
2348                 if (token.type == T_EOF)
2349                         return;
2350                 if (token.type == '{') {
2351                         eat_block();
2352                         continue;
2353                 }
2354                 next_token();
2355         }
2356 }
2357
2358 static initializer_t *create_empty_initializer(void)
2359 {
2360         static initializer_t empty_initializer
2361                 = { .list = { { INITIALIZER_LIST }, 0 } };
2362         return &empty_initializer;
2363 }
2364
2365 /**
2366  * Parse a part of an initialiser for a struct or union,
2367  */
2368 static initializer_t *parse_sub_initializer(type_path_t *path,
2369                 type_t *outer_type, size_t top_path_level,
2370                 parse_initializer_env_t *env)
2371 {
2372         if (token.type == '}') {
2373                 /* empty initializer */
2374                 return create_empty_initializer();
2375         }
2376
2377         type_t *orig_type = path->top_type;
2378         type_t *type      = NULL;
2379
2380         if (orig_type == NULL) {
2381                 /* We are initializing an empty compound. */
2382         } else {
2383                 type = skip_typeref(orig_type);
2384         }
2385
2386         initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2387
2388         while (true) {
2389                 designator_t *designator = NULL;
2390                 if (token.type == '.' || token.type == '[') {
2391                         designator = parse_designation();
2392                         goto finish_designator;
2393                 } else if (token.type == T_IDENTIFIER && look_ahead(1)->type == ':') {
2394                         /* GNU-style designator ("identifier: value") */
2395                         designator = allocate_ast_zero(sizeof(designator[0]));
2396                         designator->source_position = token.source_position;
2397                         designator->symbol          = token.v.symbol;
2398                         eat(T_IDENTIFIER);
2399                         eat(':');
2400
2401 finish_designator:
2402                         /* reset path to toplevel, evaluate designator from there */
2403                         ascend_to(path, top_path_level);
2404                         if (!walk_designator(path, designator, false)) {
2405                                 /* can't continue after designation error */
2406                                 goto end_error;
2407                         }
2408
2409                         initializer_t *designator_initializer
2410                                 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2411                         designator_initializer->designator.designator = designator;
2412                         ARR_APP1(initializer_t*, initializers, designator_initializer);
2413
2414                         orig_type = path->top_type;
2415                         type      = orig_type != NULL ? skip_typeref(orig_type) : NULL;
2416                 }
2417
2418                 initializer_t *sub;
2419
2420                 if (token.type == '{') {
2421                         if (type != NULL && is_type_scalar(type)) {
2422                                 sub = parse_scalar_initializer(type, env->must_be_constant);
2423                         } else {
2424                                 eat('{');
2425                                 if (type == NULL) {
2426                                         if (env->declaration != NULL) {
2427                                                 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2428                                                        env->declaration->symbol);
2429                                         } else {
2430                                                 errorf(HERE, "extra brace group at end of initializer");
2431                                         }
2432                                 } else
2433                                         descend_into_subtype(path);
2434
2435                                 add_anchor_token('}');
2436                                 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2437                                                             env);
2438                                 rem_anchor_token('}');
2439
2440                                 if (type != NULL) {
2441                                         ascend_from_subtype(path);
2442                                         expect('}');
2443                                 } else {
2444                                         expect('}');
2445                                         goto error_parse_next;
2446                                 }
2447                         }
2448                 } else {
2449                         /* must be an expression */
2450                         expression_t *expression = parse_assignment_expression();
2451
2452                         if (env->must_be_constant && !is_initializer_constant(expression)) {
2453                                 errorf(&expression->base.source_position,
2454                                        "Initialisation expression '%E' is not constant\n",
2455                                        expression);
2456                         }
2457
2458                         if (type == NULL) {
2459                                 /* we are already outside, ... */
2460                                 type_t *const outer_type_skip = skip_typeref(outer_type);
2461                                 if (is_type_compound(outer_type_skip) &&
2462                                     !outer_type_skip->compound.declaration->init.complete) {
2463                                         goto error_parse_next;
2464                                 }
2465                                 goto error_excess;
2466                         }
2467
2468                         /* handle { "string" } special case */
2469                         if ((expression->kind == EXPR_STRING_LITERAL
2470                                         || expression->kind == EXPR_WIDE_STRING_LITERAL)
2471                                         && outer_type != NULL) {
2472                                 sub = initializer_from_expression(outer_type, expression);
2473                                 if (sub != NULL) {
2474                                         if (token.type == ',') {
2475                                                 next_token();
2476                                         }
2477                                         if (token.type != '}') {
2478                                                 warningf(HERE, "excessive elements in initializer for type '%T'",
2479                                                                  orig_type);
2480                                         }
2481                                         /* TODO: eat , ... */
2482                                         return sub;
2483                                 }
2484                         }
2485
2486                         /* descend into subtypes until expression matches type */
2487                         while (true) {
2488                                 orig_type = path->top_type;
2489                                 type      = skip_typeref(orig_type);
2490
2491                                 sub = initializer_from_expression(orig_type, expression);
2492                                 if (sub != NULL) {
2493                                         break;
2494                                 }
2495                                 if (!is_type_valid(type)) {
2496                                         goto end_error;
2497                                 }
2498                                 if (is_type_scalar(type)) {
2499                                         errorf(&expression->base.source_position,
2500                                                         "expression '%E' doesn't match expected type '%T'",
2501                                                         expression, orig_type);
2502                                         goto end_error;
2503                                 }
2504
2505                                 descend_into_subtype(path);
2506                         }
2507                 }
2508
2509                 /* update largest index of top array */
2510                 const type_path_entry_t *first      = &path->path[0];
2511                 type_t                  *first_type = first->type;
2512                 first_type                          = skip_typeref(first_type);
2513                 if (is_type_array(first_type)) {
2514                         size_t index = first->v.index;
2515                         if (index > path->max_index)
2516                                 path->max_index = index;
2517                 }
2518
2519                 if (type != NULL) {
2520                         /* append to initializers list */
2521                         ARR_APP1(initializer_t*, initializers, sub);
2522                 } else {
2523 error_excess:
2524                         if (env->declaration != NULL)
2525                                 warningf(HERE, "excess elements in struct initializer for '%Y'",
2526                                  env->declaration->symbol);
2527                         else
2528                                 warningf(HERE, "excess elements in struct initializer");
2529                 }
2530
2531 error_parse_next:
2532                 if (token.type == '}') {
2533                         break;
2534                 }
2535                 expect(',');
2536                 if (token.type == '}') {
2537                         break;
2538                 }
2539
2540                 if (type != NULL) {
2541                         /* advance to the next declaration if we are not at the end */
2542                         advance_current_object(path, top_path_level);
2543                         orig_type = path->top_type;
2544                         if (orig_type != NULL)
2545                                 type = skip_typeref(orig_type);
2546                         else
2547                                 type = NULL;
2548                 }
2549         }
2550
2551         size_t len  = ARR_LEN(initializers);
2552         size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2553         initializer_t *result = allocate_ast_zero(size);
2554         result->kind          = INITIALIZER_LIST;
2555         result->list.len      = len;
2556         memcpy(&result->list.initializers, initializers,
2557                len * sizeof(initializers[0]));
2558
2559         DEL_ARR_F(initializers);
2560         ascend_to(path, top_path_level+1);
2561
2562         return result;
2563
2564 end_error:
2565         skip_initializers();
2566         DEL_ARR_F(initializers);
2567         ascend_to(path, top_path_level+1);
2568         return NULL;
2569 }
2570
2571 /**
2572  * Parses an initializer. Parsers either a compound literal
2573  * (env->declaration == NULL) or an initializer of a declaration.
2574  */
2575 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2576 {
2577         type_t        *type   = skip_typeref(env->type);
2578         initializer_t *result = NULL;
2579         size_t         max_index;
2580
2581         if (is_type_scalar(type)) {
2582                 result = parse_scalar_initializer(type, env->must_be_constant);
2583         } else if (token.type == '{') {
2584                 eat('{');
2585
2586                 type_path_t path;
2587                 memset(&path, 0, sizeof(path));
2588                 path.top_type = env->type;
2589                 path.path     = NEW_ARR_F(type_path_entry_t, 0);
2590
2591                 descend_into_subtype(&path);
2592
2593                 add_anchor_token('}');
2594                 result = parse_sub_initializer(&path, env->type, 1, env);
2595                 rem_anchor_token('}');
2596
2597                 max_index = path.max_index;
2598                 DEL_ARR_F(path.path);
2599
2600                 expect('}');
2601         } else {
2602                 /* parse_scalar_initializer() also works in this case: we simply
2603                  * have an expression without {} around it */
2604                 result = parse_scalar_initializer(type, env->must_be_constant);
2605         }
2606
2607         /* § 6.7.5 (22)  array initializers for arrays with unknown size determine
2608          * the array type size */
2609         if (is_type_array(type) && type->array.size_expression == NULL
2610                         && result != NULL) {
2611                 size_t size;
2612                 switch (result->kind) {
2613                 case INITIALIZER_LIST:
2614                         size = max_index + 1;
2615                         break;
2616
2617                 case INITIALIZER_STRING:
2618                         size = result->string.string.size;
2619                         break;
2620
2621                 case INITIALIZER_WIDE_STRING:
2622                         size = result->wide_string.string.size;
2623                         break;
2624
2625                 case INITIALIZER_DESIGNATOR:
2626                 case INITIALIZER_VALUE:
2627                         /* can happen for parse errors */
2628                         size = 0;
2629                         break;
2630
2631                 default:
2632                         internal_errorf(HERE, "invalid initializer type");
2633                 }
2634
2635                 expression_t *cnst       = allocate_expression_zero(EXPR_CONST);
2636                 cnst->base.type          = type_size_t;
2637                 cnst->conste.v.int_value = size;
2638
2639                 type_t *new_type = duplicate_type(type);
2640
2641                 new_type->array.size_expression = cnst;
2642                 new_type->array.size_constant   = true;
2643                 new_type->array.size            = size;
2644                 env->type = new_type;
2645         }
2646
2647         return result;
2648 end_error:
2649         return NULL;
2650 }
2651
2652 static declaration_t *append_declaration(declaration_t *declaration);
2653
2654 static declaration_t *parse_compound_type_specifier(bool is_struct)
2655 {
2656         gnu_attribute_t  *attributes = NULL;
2657         decl_modifiers_t  modifiers  = 0;
2658         if (is_struct) {
2659                 eat(T_struct);
2660         } else {
2661                 eat(T_union);
2662         }
2663
2664         symbol_t      *symbol      = NULL;
2665         declaration_t *declaration = NULL;
2666
2667         if (token.type == T___attribute__) {
2668                 modifiers |= parse_attributes(&attributes);
2669         }
2670
2671         if (token.type == T_IDENTIFIER) {
2672                 symbol = token.v.symbol;
2673                 next_token();
2674
2675                 namespace_t const namespc =
2676                         is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION;
2677                 declaration = get_declaration(symbol, namespc);
2678                 if (declaration != NULL) {
2679                         if (declaration->parent_scope != scope &&
2680                             (token.type == '{' || token.type == ';')) {
2681                                 declaration = NULL;
2682                         } else if (declaration->init.complete &&
2683                                    token.type == '{') {
2684                                 assert(symbol != NULL);
2685                                 errorf(HERE, "multiple definitions of '%s %Y' (previous definition at %P)",
2686                                        is_struct ? "struct" : "union", symbol,
2687                                        &declaration->source_position);
2688                                 declaration->scope.declarations = NULL;
2689                         }
2690                 }
2691         } else if (token.type != '{') {
2692                 if (is_struct) {
2693                         parse_error_expected("while parsing struct type specifier",
2694                                              T_IDENTIFIER, '{', NULL);
2695                 } else {
2696                         parse_error_expected("while parsing union type specifier",
2697                                              T_IDENTIFIER, '{', NULL);
2698                 }
2699
2700                 return NULL;
2701         }
2702
2703         if (declaration == NULL) {
2704                 declaration = allocate_declaration_zero();
2705                 declaration->namespc         =
2706                         (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2707                 declaration->source_position = token.source_position;
2708                 declaration->symbol          = symbol;
2709                 declaration->parent_scope    = scope;
2710                 if (symbol != NULL) {
2711                         environment_push(declaration);
2712                 }
2713                 append_declaration(declaration);
2714         }
2715
2716         if (token.type == '{') {
2717                 declaration->init.complete = true;
2718
2719                 parse_compound_type_entries(declaration);
2720                 modifiers |= parse_attributes(&attributes);
2721         }
2722
2723         declaration->modifiers |= modifiers;
2724         return declaration;
2725 }
2726
2727 static void parse_enum_entries(type_t *const enum_type)
2728 {
2729         eat('{');
2730
2731         if (token.type == '}') {
2732                 next_token();
2733                 errorf(HERE, "empty enum not allowed");
2734                 return;
2735         }
2736
2737         add_anchor_token('}');
2738         do {
2739                 if (token.type != T_IDENTIFIER) {
2740                         parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2741                         eat_block();
2742                         rem_anchor_token('}');
2743                         return;
2744                 }
2745
2746                 declaration_t *const entry = allocate_declaration_zero();
2747                 entry->storage_class   = STORAGE_CLASS_ENUM_ENTRY;
2748                 entry->type            = enum_type;
2749                 entry->symbol          = token.v.symbol;
2750                 entry->source_position = token.source_position;
2751                 next_token();
2752
2753                 if (token.type == '=') {
2754                         next_token();
2755                         expression_t *value = parse_constant_expression();
2756
2757                         value = create_implicit_cast(value, enum_type);
2758                         entry->init.enum_value = value;
2759
2760                         /* TODO semantic */
2761                 }
2762
2763                 record_declaration(entry, false);
2764
2765                 if (token.type != ',')
2766                         break;
2767                 next_token();
2768         } while (token.type != '}');
2769         rem_anchor_token('}');
2770
2771         expect('}');
2772
2773 end_error:
2774         ;
2775 }
2776
2777 static type_t *parse_enum_specifier(void)
2778 {
2779         gnu_attribute_t *attributes = NULL;
2780         declaration_t   *declaration;
2781         symbol_t        *symbol;
2782
2783         eat(T_enum);
2784         if (token.type == T_IDENTIFIER) {
2785                 symbol = token.v.symbol;
2786                 next_token();
2787
2788                 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2789         } else if (token.type != '{') {
2790                 parse_error_expected("while parsing enum type specifier",
2791                                      T_IDENTIFIER, '{', NULL);
2792                 return NULL;
2793         } else {
2794                 declaration = NULL;
2795                 symbol      = NULL;
2796         }
2797
2798         if (declaration == NULL) {
2799                 declaration = allocate_declaration_zero();
2800                 declaration->namespc         = NAMESPACE_ENUM;
2801                 declaration->source_position = token.source_position;
2802                 declaration->symbol          = symbol;
2803                 declaration->parent_scope  = scope;
2804         }
2805
2806         type_t *const type      = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2807         type->enumt.declaration = declaration;
2808
2809         if (token.type == '{') {
2810                 if (declaration->init.complete) {
2811                         errorf(HERE, "multiple definitions of enum %Y", symbol);
2812                 }
2813                 if (symbol != NULL) {
2814                         environment_push(declaration);
2815                 }
2816                 append_declaration(declaration);
2817                 declaration->init.complete = true;
2818
2819                 parse_enum_entries(type);
2820                 parse_attributes(&attributes);
2821         }
2822
2823         return type;
2824 }
2825
2826 /**
2827  * if a symbol is a typedef to another type, return true
2828  */
2829 static bool is_typedef_symbol(symbol_t *symbol)
2830 {
2831         const declaration_t *const declaration =
2832                 get_declaration(symbol, NAMESPACE_NORMAL);
2833         return
2834                 declaration != NULL &&
2835                 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2836 }
2837
2838 static type_t *parse_typeof(void)
2839 {
2840         eat(T___typeof__);
2841
2842         type_t *type;
2843
2844         expect('(');
2845         add_anchor_token(')');
2846
2847         expression_t *expression  = NULL;
2848
2849         bool old_type_prop     = in_type_prop;
2850         bool old_gcc_extension = in_gcc_extension;
2851         in_type_prop           = true;
2852
2853         while (token.type == T___extension__) {
2854                 /* This can be a prefix to a typename or an expression. */
2855                 next_token();
2856                 in_gcc_extension = true;
2857         }
2858         switch (token.type) {
2859         case T_IDENTIFIER:
2860                 if (is_typedef_symbol(token.v.symbol)) {
2861                         type = parse_typename();
2862                 } else {
2863                         expression = parse_expression();
2864                         type       = expression->base.type;
2865                 }
2866                 break;
2867
2868         TYPENAME_START
2869                 type = parse_typename();
2870                 break;
2871
2872         default:
2873                 expression = parse_expression();
2874                 type       = expression->base.type;
2875                 break;
2876         }
2877         in_type_prop     = old_type_prop;
2878         in_gcc_extension = old_gcc_extension;
2879
2880         rem_anchor_token(')');
2881         expect(')');
2882
2883         type_t *typeof_type              = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2884         typeof_type->typeoft.expression  = expression;
2885         typeof_type->typeoft.typeof_type = type;
2886
2887         return typeof_type;
2888 end_error:
2889         return NULL;
2890 }
2891
2892 typedef enum specifiers_t {
2893         SPECIFIER_SIGNED    = 1 << 0,
2894         SPECIFIER_UNSIGNED  = 1 << 1,
2895         SPECIFIER_LONG      = 1 << 2,
2896         SPECIFIER_INT       = 1 << 3,
2897         SPECIFIER_DOUBLE    = 1 << 4,
2898         SPECIFIER_CHAR      = 1 << 5,
2899         SPECIFIER_SHORT     = 1 << 6,
2900         SPECIFIER_LONG_LONG = 1 << 7,
2901         SPECIFIER_FLOAT     = 1 << 8,
2902         SPECIFIER_BOOL      = 1 << 9,
2903         SPECIFIER_VOID      = 1 << 10,
2904         SPECIFIER_INT8      = 1 << 11,
2905         SPECIFIER_INT16     = 1 << 12,
2906         SPECIFIER_INT32     = 1 << 13,
2907         SPECIFIER_INT64     = 1 << 14,
2908         SPECIFIER_INT128    = 1 << 15,
2909         SPECIFIER_COMPLEX   = 1 << 16,
2910         SPECIFIER_IMAGINARY = 1 << 17,
2911 } specifiers_t;
2912
2913 static type_t *create_builtin_type(symbol_t *const symbol,
2914                                    type_t *const real_type)
2915 {
2916         type_t *type            = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2917         type->builtin.symbol    = symbol;
2918         type->builtin.real_type = real_type;
2919
2920         type_t *result = typehash_insert(type);
2921         if (type != result) {
2922                 free_type(type);
2923         }
2924
2925         return result;
2926 }
2927
2928 static type_t *get_typedef_type(symbol_t *symbol)
2929 {
2930         declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2931         if (declaration == NULL ||
2932            declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2933                 return NULL;
2934
2935         type_t *type               = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2936         type->typedeft.declaration = declaration;
2937
2938         return type;
2939 }
2940
2941 /**
2942  * check for the allowed MS alignment values.
2943  */
2944 static bool check_alignment_value(long long intvalue)
2945 {
2946         if (intvalue < 1 || intvalue > 8192) {
2947                 errorf(HERE, "illegal alignment value");
2948                 return false;
2949         }
2950         unsigned v = (unsigned)intvalue;
2951         for (unsigned i = 1; i <= 8192; i += i) {
2952                 if (i == v)
2953                         return true;
2954         }
2955         errorf(HERE, "alignment must be power of two");
2956         return false;
2957 }
2958
2959 #define DET_MOD(name, tag) do { \
2960         if (*modifiers & tag) warningf(HERE, #name " used more than once"); \
2961         *modifiers |= tag; \
2962 } while (0)
2963
2964 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2965 {
2966         decl_modifiers_t *modifiers = &specifiers->modifiers;
2967
2968         while (true) {
2969                 if (token.type == T_restrict) {
2970                         next_token();
2971                         DET_MOD(restrict, DM_RESTRICT);
2972                         goto end_loop;
2973                 } else if (token.type != T_IDENTIFIER)
2974                         break;
2975                 symbol_t *symbol = token.v.symbol;
2976                 if (symbol == sym_align) {
2977                         next_token();
2978                         expect('(');
2979                         if (token.type != T_INTEGER)
2980                                 goto end_error;
2981                         if (check_alignment_value(token.v.intvalue)) {
2982                                 if (specifiers->alignment != 0)
2983                                         warningf(HERE, "align used more than once");
2984                                 specifiers->alignment = (unsigned char)token.v.intvalue;
2985                         }
2986                         next_token();
2987                         expect(')');
2988                 } else if (symbol == sym_allocate) {
2989                         next_token();
2990                         expect('(');
2991                         if (token.type != T_IDENTIFIER)
2992                                 goto end_error;
2993                         (void)token.v.symbol;
2994                         expect(')');
2995                 } else if (symbol == sym_dllimport) {
2996                         next_token();
2997                         DET_MOD(dllimport, DM_DLLIMPORT);
2998                 } else if (symbol == sym_dllexport) {
2999                         next_token();
3000                         DET_MOD(dllexport, DM_DLLEXPORT);
3001                 } else if (symbol == sym_thread) {
3002                         next_token();
3003                         DET_MOD(thread, DM_THREAD);
3004                 } else if (symbol == sym_naked) {
3005                         next_token();
3006                         DET_MOD(naked, DM_NAKED);
3007                 } else if (symbol == sym_noinline) {
3008                         next_token();
3009                         DET_MOD(noinline, DM_NOINLINE);
3010                 } else if (symbol == sym_noreturn) {
3011                         next_token();
3012                         DET_MOD(noreturn, DM_NORETURN);
3013                 } else if (symbol == sym_nothrow) {
3014                         next_token();
3015                         DET_MOD(nothrow, DM_NOTHROW);
3016                 } else if (symbol == sym_novtable) {
3017                         next_token();
3018                         DET_MOD(novtable, DM_NOVTABLE);
3019                 } else if (symbol == sym_property) {
3020                         next_token();
3021                         expect('(');
3022                         for (;;) {
3023                                 bool is_get = false;
3024                                 if (token.type != T_IDENTIFIER)
3025                                         goto end_error;
3026                                 if (token.v.symbol == sym_get) {
3027                                         is_get = true;
3028                                 } else if (token.v.symbol == sym_put) {
3029                                 } else {
3030                                         errorf(HERE, "Bad property name '%Y'", token.v.symbol);
3031                                         goto end_error;
3032                                 }
3033                                 next_token();
3034                                 expect('=');
3035                                 if (token.type != T_IDENTIFIER)
3036                                         goto end_error;
3037                                 if (is_get) {
3038                                         if (specifiers->get_property_sym != NULL) {
3039                                                 errorf(HERE, "get property name already specified");
3040                                         } else {
3041                                                 specifiers->get_property_sym = token.v.symbol;
3042                                         }
3043                                 } else {
3044                                         if (specifiers->put_property_sym != NULL) {
3045                                                 errorf(HERE, "put property name already specified");
3046                                         } else {
3047                                                 specifiers->put_property_sym = token.v.symbol;
3048                                         }
3049                                 }
3050                                 next_token();
3051                                 if (token.type == ',') {
3052                                         next_token();
3053                                         continue;
3054                                 }
3055                                 break;
3056                         }
3057                         expect(')');
3058                 } else if (symbol == sym_selectany) {
3059                         next_token();
3060                         DET_MOD(selectany, DM_SELECTANY);
3061                 } else if (symbol == sym_uuid) {
3062                         next_token();
3063                         expect('(');
3064                         if (token.type != T_STRING_LITERAL)
3065                                 goto end_error;
3066                         next_token();
3067                         expect(')');
3068                 } else if (symbol == sym_deprecated) {
3069                         next_token();
3070                         if (specifiers->deprecated != 0)
3071                                 warningf(HERE, "deprecated used more than once");
3072                         specifiers->deprecated = 1;
3073                         if (token.type == '(') {
3074                                 next_token();
3075                                 if (token.type == T_STRING_LITERAL) {
3076                                         specifiers->deprecated_string = token.v.string.begin;
3077                                         next_token();
3078                                 } else {
3079                                         errorf(HERE, "string literal expected");
3080                                 }
3081                                 expect(')');
3082                         }
3083                 } else if (symbol == sym_noalias) {
3084                         next_token();
3085                         DET_MOD(noalias, DM_NOALIAS);
3086                 } else {
3087                         warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
3088                         next_token();
3089                         if (token.type == '(')
3090                                 skip_until(')');
3091                 }
3092 end_loop:
3093                 if (token.type == ',')
3094                         next_token();
3095         }
3096 end_error:
3097         return;
3098 }
3099
3100 static declaration_t *create_error_declaration(symbol_t *symbol, storage_class_tag_t storage_class)
3101 {
3102         declaration_t *const decl    = allocate_declaration_zero();
3103         decl->source_position        = *HERE;
3104         decl->declared_storage_class = storage_class;
3105         decl->storage_class          =
3106                 storage_class != STORAGE_CLASS_NONE || scope == file_scope ?
3107                         storage_class : STORAGE_CLASS_AUTO;
3108         decl->symbol                 = symbol;
3109         decl->implicit               = true;
3110         record_declaration(decl, false);
3111         return decl;
3112 }
3113
3114 /**
3115  * Finish the construction of a struct type by calculating
3116  * its size, offsets, alignment.
3117  */
3118 static void finish_struct_type(compound_type_t *type) {
3119         if (type->declaration == NULL)
3120                 return;
3121         declaration_t *struct_decl = type->declaration;
3122         if (! struct_decl->init.complete)
3123                 return;
3124
3125         il_size_t      size           = 0;
3126         il_size_t      offset;
3127         il_alignment_t alignment      = 1;
3128         bool           need_pad       = false;
3129
3130         declaration_t *entry = struct_decl->scope.declarations;
3131         for (; entry != NULL; entry = entry->next) {
3132                 if (entry->namespc != NAMESPACE_NORMAL)
3133                         continue;
3134
3135                 type_t *m_type = skip_typeref(entry->type);
3136                 if (! is_type_valid(m_type)) {
3137                         /* simply ignore errors here */
3138                         continue;
3139                 }
3140                 il_alignment_t m_alignment = m_type->base.alignment;
3141                 if (m_alignment > alignment)
3142                         alignment = m_alignment;
3143
3144                 offset = (size + m_alignment - 1) & -m_alignment;
3145
3146                 if (offset > size)
3147                         need_pad = true;
3148                 entry->offset = offset;
3149                 size = offset + m_type->base.size;
3150         }
3151         if (type->base.alignment != 0) {
3152                 alignment = type->base.alignment;
3153         }
3154
3155         offset = (size + alignment - 1) & -alignment;
3156         if (offset > size)
3157                 need_pad = true;
3158
3159         if (warning.padded && need_pad) {
3160                 warningf(&struct_decl->source_position,
3161                         "'%#T' needs padding", type, struct_decl->symbol);
3162         }
3163         if (warning.packed && !need_pad) {
3164                 warningf(&struct_decl->source_position,
3165                         "superfluous packed attribute on '%#T'",
3166                         type, struct_decl->symbol);
3167         }
3168
3169         type->base.size      = offset;
3170         type->base.alignment = alignment;
3171 }
3172
3173 /**
3174  * Finish the construction of an union type by calculating
3175  * its size and alignment.
3176  */
3177 static void finish_union_type(compound_type_t *type) {
3178         if (type->declaration == NULL)
3179                 return;
3180         declaration_t *union_decl = type->declaration;
3181         if (! union_decl->init.complete)
3182                 return;
3183
3184         il_size_t      size      = 0;
3185         il_alignment_t alignment = 1;
3186
3187         declaration_t *entry = union_decl->scope.declarations;
3188         for (; entry != NULL; entry = entry->next) {
3189                 if (entry->namespc != NAMESPACE_NORMAL)
3190                         continue;
3191
3192                 type_t *m_type = skip_typeref(entry->type);
3193                 if (! is_type_valid(m_type))
3194                         continue;
3195
3196                 entry->offset = 0;
3197                 if (m_type->base.size > size)
3198                         size = m_type->base.size;
3199                 if (m_type->base.alignment > alignment)
3200                         alignment = m_type->base.alignment;
3201         }
3202         if (type->base.alignment != 0) {
3203                 alignment = type->base.alignment;
3204         }
3205         size = (size + alignment - 1) & -alignment;
3206         type->base.size      = size;
3207         type->base.alignment = alignment;
3208 }
3209
3210 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
3211 {
3212         type_t            *type              = NULL;
3213         type_qualifiers_t  qualifiers        = TYPE_QUALIFIER_NONE;
3214         type_modifiers_t   modifiers         = TYPE_MODIFIER_NONE;
3215         unsigned           type_specifiers   = 0;
3216         bool               newtype           = false;
3217         bool               saw_error         = false;
3218         bool               old_gcc_extension = in_gcc_extension;
3219
3220         specifiers->source_position = token.source_position;
3221
3222         while (true) {
3223                 specifiers->modifiers
3224                         |= parse_attributes(&specifiers->gnu_attributes);
3225                 if (specifiers->modifiers & DM_TRANSPARENT_UNION)
3226                         modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3227
3228                 switch (token.type) {
3229
3230                 /* storage class */
3231 #define MATCH_STORAGE_CLASS(token, class)                                  \
3232                 case token:                                                        \
3233                         if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
3234                                 errorf(HERE, "multiple storage classes in declaration specifiers"); \
3235                         }                                                              \
3236                         specifiers->declared_storage_class = class;                    \
3237                         next_token();                                                  \
3238                         break;
3239
3240                 MATCH_STORAGE_CLASS(T_typedef,  STORAGE_CLASS_TYPEDEF)
3241                 MATCH_STORAGE_CLASS(T_extern,   STORAGE_CLASS_EXTERN)
3242                 MATCH_STORAGE_CLASS(T_static,   STORAGE_CLASS_STATIC)
3243                 MATCH_STORAGE_CLASS(T_auto,     STORAGE_CLASS_AUTO)
3244                 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
3245
3246                 case T__declspec:
3247                         next_token();
3248                         expect('(');
3249                         add_anchor_token(')');
3250                         parse_microsoft_extended_decl_modifier(specifiers);
3251                         rem_anchor_token(')');
3252                         expect(')');
3253                         break;
3254
3255                 case T___thread:
3256                         switch (specifiers->declared_storage_class) {
3257                         case STORAGE_CLASS_NONE:
3258                                 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
3259                                 break;
3260
3261                         case STORAGE_CLASS_EXTERN:
3262                                 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
3263                                 break;
3264
3265                         case STORAGE_CLASS_STATIC:
3266                                 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
3267                                 break;
3268
3269                         default:
3270                                 errorf(HERE, "multiple storage classes in declaration specifiers");
3271                                 break;
3272                         }
3273                         next_token();
3274                         break;
3275
3276                 /* type qualifiers */
3277 #define MATCH_TYPE_QUALIFIER(token, qualifier)                          \
3278                 case token:                                                     \
3279                         qualifiers |= qualifier;                                    \
3280                         next_token();                                               \
3281                         break
3282
3283                 MATCH_TYPE_QUALIFIER(T_const,    TYPE_QUALIFIER_CONST);
3284                 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3285                 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3286                 MATCH_TYPE_QUALIFIER(T__w64,     TYPE_QUALIFIER_W64);
3287                 MATCH_TYPE_QUALIFIER(T___ptr32,  TYPE_QUALIFIER_PTR32);
3288                 MATCH_TYPE_QUALIFIER(T___ptr64,  TYPE_QUALIFIER_PTR64);
3289                 MATCH_TYPE_QUALIFIER(T___uptr,   TYPE_QUALIFIER_UPTR);
3290                 MATCH_TYPE_QUALIFIER(T___sptr,   TYPE_QUALIFIER_SPTR);
3291
3292                 case T___extension__:
3293                         next_token();
3294                         in_gcc_extension = true;
3295                         break;
3296
3297                 /* type specifiers */
3298 #define MATCH_SPECIFIER(token, specifier, name)                         \
3299                 case token:                                                     \
3300                         next_token();                                               \
3301                         if (type_specifiers & specifier) {                           \
3302                                 errorf(HERE, "multiple " name " type specifiers given"); \
3303                         } else {                                                    \
3304                                 type_specifiers |= specifier;                           \
3305                         }                                                           \
3306                         break
3307
3308                 MATCH_SPECIFIER(T_void,       SPECIFIER_VOID,      "void");
3309                 MATCH_SPECIFIER(T_char,       SPECIFIER_CHAR,      "char");
3310                 MATCH_SPECIFIER(T_short,      SPECIFIER_SHORT,     "short");
3311                 MATCH_SPECIFIER(T_int,        SPECIFIER_INT,       "int");
3312                 MATCH_SPECIFIER(T_float,      SPECIFIER_FLOAT,     "float");
3313                 MATCH_SPECIFIER(T_double,     SPECIFIER_DOUBLE,    "double");
3314                 MATCH_SPECIFIER(T_signed,     SPECIFIER_SIGNED,    "signed");
3315                 MATCH_SPECIFIER(T_unsigned,   SPECIFIER_UNSIGNED,  "unsigned");
3316                 MATCH_SPECIFIER(T__Bool,      SPECIFIER_BOOL,      "_Bool");
3317                 MATCH_SPECIFIER(T__int8,      SPECIFIER_INT8,      "_int8");
3318                 MATCH_SPECIFIER(T__int16,     SPECIFIER_INT16,     "_int16");
3319                 MATCH_SPECIFIER(T__int32,     SPECIFIER_INT32,     "_int32");
3320                 MATCH_SPECIFIER(T__int64,     SPECIFIER_INT64,     "_int64");
3321                 MATCH_SPECIFIER(T__int128,    SPECIFIER_INT128,    "_int128");
3322                 MATCH_SPECIFIER(T__Complex,   SPECIFIER_COMPLEX,   "_Complex");
3323                 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary");
3324
3325                 case T__forceinline:
3326                         /* only in microsoft mode */
3327                         specifiers->modifiers |= DM_FORCEINLINE;
3328                         /* FALLTHROUGH */
3329
3330                 case T_inline:
3331                         next_token();
3332                         specifiers->is_inline = true;
3333                         break;
3334
3335                 case T_long:
3336                         next_token();
3337                         if (type_specifiers & SPECIFIER_LONG_LONG) {
3338                                 errorf(HERE, "multiple type specifiers given");
3339                         } else if (type_specifiers & SPECIFIER_LONG) {
3340                                 type_specifiers |= SPECIFIER_LONG_LONG;
3341                         } else {
3342                                 type_specifiers |= SPECIFIER_LONG;
3343                         }
3344                         break;
3345
3346                 case T_struct: {
3347                         type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
3348
3349                         type->compound.declaration = parse_compound_type_specifier(true);
3350                         finish_struct_type(&type->compound);
3351                         break;
3352                 }
3353                 case T_union: {
3354                         type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
3355                         type->compound.declaration = parse_compound_type_specifier(false);
3356                         if (type->compound.declaration->modifiers & DM_TRANSPARENT_UNION)
3357                                 modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3358                         finish_union_type(&type->compound);
3359                         break;
3360                 }
3361                 case T_enum:
3362                         type = parse_enum_specifier();
3363                         break;
3364                 case T___typeof__:
3365                         type = parse_typeof();
3366                         break;
3367                 case T___builtin_va_list:
3368                         type = duplicate_type(type_valist);
3369                         next_token();
3370                         break;
3371
3372                 case T_IDENTIFIER: {
3373                         /* only parse identifier if we haven't found a type yet */
3374                         if (type != NULL || type_specifiers != 0) {
3375                                 /* Be somewhat resilient to typos like 'unsigned lng* f()' in a
3376                                  * declaration, so it doesn't generate errors about expecting '(' or
3377                                  * '{' later on. */
3378                                 switch (look_ahead(1)->type) {
3379                                         STORAGE_CLASSES
3380                                         TYPE_SPECIFIERS
3381                                         case T_const:
3382                                         case T_restrict:
3383                                         case T_volatile:
3384                                         case T_inline:
3385                                         case T__forceinline: /* ^ DECLARATION_START except for __attribute__ */
3386                                         case T_IDENTIFIER:
3387                                         case '*':
3388                                                 errorf(HERE, "discarding stray %K in declaration specifier", &token);
3389                                                 next_token();
3390                                                 continue;
3391
3392                                         default:
3393                                                 goto finish_specifiers;
3394                                 }
3395                         }
3396
3397                         type_t *const typedef_type = get_typedef_type(token.v.symbol);
3398                         if (typedef_type == NULL) {
3399                                 /* Be somewhat resilient to typos like 'vodi f()' at the beginning of a
3400                                  * declaration, so it doesn't generate 'implicit int' followed by more
3401                                  * errors later on. */
3402                                 token_type_t const la1_type = (token_type_t)look_ahead(1)->type;
3403                                 switch (la1_type) {
3404                                         DECLARATION_START
3405                                         case T_IDENTIFIER:
3406                                         case '*': {
3407                                                 errorf(HERE, "%K does not name a type", &token);
3408
3409                                                 declaration_t *const decl =
3410                                                         create_error_declaration(token.v.symbol, STORAGE_CLASS_TYPEDEF);
3411
3412                                                 type = allocate_type_zero(TYPE_TYPEDEF, HERE);
3413                                                 type->typedeft.declaration = decl;
3414
3415                                                 next_token();
3416                                                 saw_error = true;
3417                                                 if (la1_type == '*')
3418                                                         goto finish_specifiers;
3419                                                 continue;
3420                                         }
3421
3422                                         default:
3423                                                 goto finish_specifiers;
3424                                 }
3425                         }
3426
3427                         next_token();
3428                         type = typedef_type;
3429                         break;
3430                 }
3431
3432                 /* function specifier */
3433                 default:
3434                         goto finish_specifiers;
3435                 }
3436         }
3437
3438 finish_specifiers:
3439         in_gcc_extension = old_gcc_extension;
3440
3441         if (type == NULL || (saw_error && type_specifiers != 0)) {
3442                 atomic_type_kind_t atomic_type;
3443
3444                 /* match valid basic types */
3445                 switch(type_specifiers) {
3446                 case SPECIFIER_VOID:
3447                         atomic_type = ATOMIC_TYPE_VOID;
3448                         break;
3449                 case SPECIFIER_CHAR:
3450                         atomic_type = ATOMIC_TYPE_CHAR;
3451                         break;
3452                 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3453                         atomic_type = ATOMIC_TYPE_SCHAR;
3454                         break;
3455                 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3456                         atomic_type = ATOMIC_TYPE_UCHAR;
3457                         break;
3458                 case SPECIFIER_SHORT:
3459                 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3460                 case SPECIFIER_SHORT | SPECIFIER_INT:
3461                 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3462                         atomic_type = ATOMIC_TYPE_SHORT;
3463                         break;
3464                 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3465                 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3466                         atomic_type = ATOMIC_TYPE_USHORT;
3467                         break;
3468                 case SPECIFIER_INT:
3469                 case SPECIFIER_SIGNED:
3470                 case SPECIFIER_SIGNED | SPECIFIER_INT:
3471                         atomic_type = ATOMIC_TYPE_INT;
3472                         break;
3473                 case SPECIFIER_UNSIGNED:
3474                 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3475                         atomic_type = ATOMIC_TYPE_UINT;
3476                         break;
3477                 case SPECIFIER_LONG:
3478                 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3479                 case SPECIFIER_LONG | SPECIFIER_INT:
3480                 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3481                         atomic_type = ATOMIC_TYPE_LONG;
3482                         break;
3483                 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3484                 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3485                         atomic_type = ATOMIC_TYPE_ULONG;
3486                         break;
3487
3488                 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3489                 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3490                 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3491                 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3492                         | SPECIFIER_INT:
3493                         atomic_type = ATOMIC_TYPE_LONGLONG;
3494                         goto warn_about_long_long;
3495
3496                 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3497                 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3498                         | SPECIFIER_INT:
3499                         atomic_type = ATOMIC_TYPE_ULONGLONG;
3500 warn_about_long_long:
3501                         if (warning.long_long) {
3502                                 warningf(&specifiers->source_position,
3503                                          "ISO C90 does not support 'long long'");
3504                         }
3505                         break;
3506
3507                 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3508                         atomic_type = unsigned_int8_type_kind;
3509                         break;
3510
3511                 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3512                         atomic_type = unsigned_int16_type_kind;
3513                         break;
3514
3515                 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3516                         atomic_type = unsigned_int32_type_kind;
3517                         break;
3518
3519                 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3520                         atomic_type = unsigned_int64_type_kind;
3521                         break;
3522
3523                 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3524                         atomic_type = unsigned_int128_type_kind;
3525                         break;
3526
3527                 case SPECIFIER_INT8:
3528                 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3529                         atomic_type = int8_type_kind;
3530                         break;
3531
3532                 case SPECIFIER_INT16:
3533                 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3534                         atomic_type = int16_type_kind;
3535                         break;
3536
3537                 case SPECIFIER_INT32:
3538                 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3539                         atomic_type = int32_type_kind;
3540                         break;
3541
3542                 case SPECIFIER_INT64:
3543                 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3544                         atomic_type = int64_type_kind;
3545                         break;
3546
3547                 case SPECIFIER_INT128:
3548                 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3549                         atomic_type = int128_type_kind;
3550                         break;
3551
3552                 case SPECIFIER_FLOAT:
3553                         atomic_type = ATOMIC_TYPE_FLOAT;
3554                         break;
3555                 case SPECIFIER_DOUBLE:
3556                         atomic_type = ATOMIC_TYPE_DOUBLE;
3557                         break;
3558                 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3559                         atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3560                         break;
3561                 case SPECIFIER_BOOL:
3562                         atomic_type = ATOMIC_TYPE_BOOL;
3563                         break;
3564                 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3565                 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3566                         atomic_type = ATOMIC_TYPE_FLOAT;
3567                         break;
3568                 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3569                 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3570                         atomic_type = ATOMIC_TYPE_DOUBLE;
3571                         break;
3572                 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3573                 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3574                         atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3575                         break;
3576                 default:
3577                         /* invalid specifier combination, give an error message */
3578                         if (type_specifiers == 0) {
3579                                 if (saw_error)
3580                                         goto end_error;
3581
3582                                 if (!strict_mode) {
3583                                         if (warning.implicit_int) {
3584                                                 warningf(HERE, "no type specifiers in declaration, using 'int'");
3585                                         }
3586                                         atomic_type = ATOMIC_TYPE_INT;
3587                                         break;
3588                                 } else {
3589                                         errorf(HERE, "no type specifiers given in declaration");
3590                                 }
3591                         } else if ((type_specifiers & SPECIFIER_SIGNED) &&
3592                                   (type_specifiers & SPECIFIER_UNSIGNED)) {
3593                                 errorf(HERE, "signed and unsigned specifiers given");
3594                         } else if (type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3595                                 errorf(HERE, "only integer types can be signed or unsigned");
3596                         } else {
3597                                 errorf(HERE, "multiple datatypes in declaration");
3598                         }
3599                         goto end_error;
3600                 }
3601
3602                 if (type_specifiers & SPECIFIER_COMPLEX) {
3603                         type                = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3604                         type->complex.akind = atomic_type;
3605                 } else if (type_specifiers & SPECIFIER_IMAGINARY) {
3606                         type                  = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3607                         type->imaginary.akind = atomic_type;
3608                 } else {
3609                         type               = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3610                         type->atomic.akind = atomic_type;
3611                 }
3612                 newtype = true;
3613         } else if (type_specifiers != 0) {
3614                 errorf(HERE, "multiple datatypes in declaration");
3615         }
3616
3617         /* FIXME: check type qualifiers here */
3618
3619         type->base.qualifiers = qualifiers;
3620         type->base.modifiers  = modifiers;
3621
3622         type_t *result = typehash_insert(type);
3623         if (newtype && result != type) {
3624                 free_type(type);
3625         }
3626
3627         specifiers->type = result;
3628         return;
3629
3630 end_error:
3631         specifiers->type = type_error_type;
3632         return;
3633 }
3634
3635 static type_qualifiers_t parse_type_qualifiers(void)
3636 {
3637         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
3638
3639         while (true) {
3640                 switch(token.type) {
3641                 /* type qualifiers */
3642                 MATCH_TYPE_QUALIFIER(T_const,    TYPE_QUALIFIER_CONST);
3643                 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3644                 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3645                 /* microsoft extended type modifiers */
3646                 MATCH_TYPE_QUALIFIER(T__w64,     TYPE_QUALIFIER_W64);
3647                 MATCH_TYPE_QUALIFIER(T___ptr32,  TYPE_QUALIFIER_PTR32);
3648                 MATCH_TYPE_QUALIFIER(T___ptr64,  TYPE_QUALIFIER_PTR64);
3649                 MATCH_TYPE_QUALIFIER(T___uptr,   TYPE_QUALIFIER_UPTR);
3650                 MATCH_TYPE_QUALIFIER(T___sptr,   TYPE_QUALIFIER_SPTR);
3651
3652                 default:
3653                         return qualifiers;
3654                 }
3655         }
3656 }
3657
3658 /**
3659  * Parses an K&R identifier list and return a list of declarations.
3660  *
3661  * @param last  points to the last declaration in the list
3662  * @return the list of declarations
3663  */
3664 static declaration_t *parse_identifier_list(declaration_t **last)
3665 {
3666         declaration_t *declarations     = NULL;
3667         declaration_t *last_declaration = NULL;
3668         do {
3669                 declaration_t *const declaration = allocate_declaration_zero();
3670                 declaration->type            = NULL; /* a K&R parameter list has no types, yet */
3671                 declaration->source_position = token.source_position;
3672                 declaration->symbol          = token.v.symbol;
3673                 next_token();
3674
3675                 if (last_declaration != NULL) {
3676                         last_declaration->next = declaration;
3677                 } else {
3678                         declarations = declaration;
3679                 }
3680                 last_declaration = declaration;
3681
3682                 if (token.type != ',') {
3683                         break;
3684                 }
3685                 next_token();
3686         } while (token.type == T_IDENTIFIER);
3687
3688         *last = last_declaration;
3689         return declarations;
3690 }
3691
3692 static type_t *automatic_type_conversion(type_t *orig_type);
3693
3694 static void semantic_parameter(declaration_t *declaration)
3695 {
3696         /* TODO: improve error messages */
3697         source_position_t const* const pos = &declaration->source_position;
3698
3699         switch (declaration->declared_storage_class) {
3700                 case STORAGE_CLASS_TYPEDEF:
3701                         errorf(pos, "typedef not allowed in parameter list");
3702                         break;
3703
3704                 /* Allowed storage classes */
3705                 case STORAGE_CLASS_NONE:
3706                 case STORAGE_CLASS_REGISTER:
3707                         break;
3708
3709                 default:
3710                         errorf(pos, "parameter may only have none or register storage class");
3711                         break;
3712         }
3713
3714         type_t *const orig_type = declaration->type;
3715         /* §6.7.5.3(7): Array as last part of a parameter type is just syntactic
3716          * sugar.  Turn it into a pointer.
3717          * §6.7.5.3(8): A declaration of a parameter as ``function returning type''
3718          * shall be adjusted to ``pointer to function returning type'', as in 6.3.2.1.
3719          */
3720         type_t *const type = automatic_type_conversion(orig_type);
3721         declaration->type = type;
3722
3723         if (is_type_incomplete(skip_typeref(type))) {
3724                 errorf(pos, "parameter '%#T' is of incomplete type",
3725                        orig_type, declaration->symbol);
3726         }
3727 }
3728
3729 static declaration_t *parse_parameter(void)
3730 {
3731         declaration_specifiers_t specifiers;
3732         memset(&specifiers, 0, sizeof(specifiers));
3733
3734         parse_declaration_specifiers(&specifiers);
3735
3736         declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3737
3738         return declaration;
3739 }
3740
3741 /**
3742  * Parses a function type parameter list and return a list of declarations.
3743  *
3744  * @param last  point to the last element of the list
3745  * @return the parameter list
3746  */
3747 static declaration_t *parse_parameters(function_type_t *type, declaration_t **last)
3748 {
3749         declaration_t *declarations = NULL;
3750
3751         eat('(');
3752         add_anchor_token(')');
3753         int saved_comma_state = save_and_reset_anchor_state(',');
3754
3755         if (token.type == T_IDENTIFIER &&
3756             !is_typedef_symbol(token.v.symbol)) {
3757                 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
3758                 if (la1_type == ',' || la1_type == ')') {
3759                         type->kr_style_parameters = true;
3760                         declarations = parse_identifier_list(last);
3761                         goto parameters_finished;
3762                 }
3763         }
3764
3765         if (token.type == ')') {
3766                 type->unspecified_parameters = 1;
3767                 goto parameters_finished;
3768         }
3769
3770         declaration_t        *declaration;
3771         declaration_t        *last_declaration = NULL;
3772         function_parameter_t *parameter;
3773         function_parameter_t *last_parameter = NULL;
3774
3775         while (true) {
3776                 switch(token.type) {
3777                 case T_DOTDOTDOT:
3778                         next_token();
3779                         type->variadic = 1;
3780                         goto parameters_finished;
3781
3782                 case T_IDENTIFIER:
3783                 case T___extension__:
3784                 DECLARATION_START
3785                         declaration = parse_parameter();
3786
3787                         /* func(void) is not a parameter */
3788                         if (last_parameter == NULL
3789                                         && token.type == ')'
3790                                         && declaration->symbol == NULL
3791                                         && skip_typeref(declaration->type) == type_void) {
3792                                 goto parameters_finished;
3793                         }
3794                         semantic_parameter(declaration);
3795
3796                         parameter       = obstack_alloc(type_obst, sizeof(parameter[0]));
3797                         memset(parameter, 0, sizeof(parameter[0]));
3798                         parameter->type = declaration->type;
3799
3800                         if (last_parameter != NULL) {
3801                                 last_declaration->next = declaration;
3802                                 last_parameter->next   = parameter;
3803                         } else {
3804                                 type->parameters = parameter;
3805                                 declarations     = declaration;
3806                         }
3807                         last_parameter   = parameter;
3808                         last_declaration = declaration;
3809                         break;
3810
3811                 default:
3812                         goto parameters_finished;
3813                 }
3814                 if (token.type != ',') {
3815                         goto parameters_finished;
3816                 }
3817                 next_token();
3818         }
3819
3820
3821 parameters_finished:
3822         rem_anchor_token(')');
3823         expect(')');
3824
3825         restore_anchor_state(',', saved_comma_state);
3826         *last = last_declaration;
3827         return declarations;
3828
3829 end_error:
3830         restore_anchor_state(',', saved_comma_state);
3831         *last = NULL;
3832         return NULL;
3833 }
3834
3835 typedef enum construct_type_kind_t {
3836         CONSTRUCT_INVALID,
3837         CONSTRUCT_POINTER,
3838         CONSTRUCT_FUNCTION,
3839         CONSTRUCT_ARRAY
3840 } construct_type_kind_t;
3841
3842 typedef struct construct_type_t construct_type_t;
3843 struct construct_type_t {
3844         construct_type_kind_t  kind;
3845         construct_type_t      *next;
3846 };
3847
3848 typedef struct parsed_pointer_t parsed_pointer_t;
3849 struct parsed_pointer_t {
3850         construct_type_t  construct_type;
3851         type_qualifiers_t type_qualifiers;
3852 };
3853
3854 typedef struct construct_function_type_t construct_function_type_t;
3855 struct construct_function_type_t {
3856         construct_type_t  construct_type;
3857         type_t           *function_type;
3858 };
3859
3860 typedef struct parsed_array_t parsed_array_t;
3861 struct parsed_array_t {
3862         construct_type_t  construct_type;
3863         type_qualifiers_t type_qualifiers;
3864         bool              is_static;
3865         bool              is_variable;
3866         expression_t     *size;
3867 };
3868
3869 typedef struct construct_base_type_t construct_base_type_t;
3870 struct construct_base_type_t {
3871         construct_type_t  construct_type;
3872         type_t           *type;
3873 };
3874
3875 static construct_type_t *parse_pointer_declarator(void)
3876 {
3877         eat('*');
3878
3879         parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3880         memset(pointer, 0, sizeof(pointer[0]));
3881         pointer->construct_type.kind = CONSTRUCT_POINTER;
3882         pointer->type_qualifiers     = parse_type_qualifiers();
3883
3884         return (construct_type_t*) pointer;
3885 }
3886
3887 static construct_type_t *parse_array_declarator(void)
3888 {
3889         eat('[');
3890         add_anchor_token(']');
3891
3892         parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3893         memset(array, 0, sizeof(array[0]));
3894         array->construct_type.kind = CONSTRUCT_ARRAY;
3895
3896         if (token.type == T_static) {
3897                 array->is_static = true;
3898                 next_token();
3899         }
3900
3901         type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3902         if (type_qualifiers != 0) {
3903                 if (token.type == T_static) {
3904                         array->is_static = true;
3905                         next_token();
3906                 }
3907         }
3908         array->type_qualifiers = type_qualifiers;
3909
3910         if (token.type == '*' && look_ahead(1)->type == ']') {
3911                 array->is_variable = true;
3912                 next_token();
3913         } else if (token.type != ']') {
3914                 array->size = parse_assignment_expression();
3915         }
3916
3917         rem_anchor_token(']');
3918         expect(']');
3919
3920 end_error:
3921         return (construct_type_t*) array;
3922 }
3923
3924 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3925 {
3926         type_t *type;
3927         if (declaration != NULL) {
3928                 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3929
3930                 unsigned mask = declaration->modifiers & (DM_CDECL|DM_STDCALL|DM_FASTCALL|DM_THISCALL);
3931
3932                 if (mask & (mask-1)) {
3933                         const char *first = NULL, *second = NULL;
3934
3935                         /* more than one calling convention set */
3936                         if (declaration->modifiers & DM_CDECL) {
3937                                 if (first == NULL)       first = "cdecl";
3938                                 else if (second == NULL) second = "cdecl";
3939                         }
3940                         if (declaration->modifiers & DM_STDCALL) {
3941                                 if (first == NULL)       first = "stdcall";
3942                                 else if (second == NULL) second = "stdcall";
3943                         }
3944                         if (declaration->modifiers & DM_FASTCALL) {
3945                                 if (first == NULL)       first = "fastcall";
3946                                 else if (second == NULL) second = "fastcall";
3947                         }
3948                         if (declaration->modifiers & DM_THISCALL) {
3949                                 if (first == NULL)       first = "thiscall";
3950                                 else if (second == NULL) second = "thiscall";
3951                         }
3952                         errorf(&declaration->source_position, "%s and %s attributes are not compatible", first, second);
3953                 }
3954
3955                 if (declaration->modifiers & DM_CDECL)
3956                         type->function.calling_convention = CC_CDECL;
3957                 else if (declaration->modifiers & DM_STDCALL)
3958                         type->function.calling_convention = CC_STDCALL;
3959                 else if (declaration->modifiers & DM_FASTCALL)
3960                         type->function.calling_convention = CC_FASTCALL;
3961                 else if (declaration->modifiers & DM_THISCALL)
3962                         type->function.calling_convention = CC_THISCALL;
3963         } else {
3964                 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3965         }
3966
3967         declaration_t *last;
3968         declaration_t *parameters = parse_parameters(&type->function, &last);
3969         if (declaration != NULL) {
3970                 declaration->scope.declarations     = parameters;
3971                 declaration->scope.last_declaration = last;
3972                 declaration->scope.is_parameter     = true;
3973         }
3974
3975         construct_function_type_t *construct_function_type =
3976                 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3977         memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3978         construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3979         construct_function_type->function_type       = type;
3980
3981         return &construct_function_type->construct_type;
3982 }
3983
3984 static void fix_declaration_type(declaration_t *declaration)
3985 {
3986         decl_modifiers_t declaration_modifiers = declaration->modifiers;
3987         type_modifiers_t type_modifiers        = declaration->type->base.modifiers;
3988
3989         if (declaration_modifiers & DM_TRANSPARENT_UNION)
3990                 type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION;
3991
3992         if (declaration->type->base.modifiers == type_modifiers)
3993                 return;
3994
3995         type_t *copy = duplicate_type(declaration->type);
3996         copy->base.modifiers = type_modifiers;
3997
3998         type_t *result = typehash_insert(copy);
3999         if (result != copy) {
4000                 obstack_free(type_obst, copy);
4001         }
4002
4003         declaration->type = result;
4004 }
4005
4006 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
4007                 bool may_be_abstract)
4008 {
4009         /* construct a single linked list of construct_type_t's which describe
4010          * how to construct the final declarator type */
4011         construct_type_t *first = NULL;
4012         construct_type_t *last  = NULL;
4013         gnu_attribute_t  *attributes = NULL;
4014
4015         decl_modifiers_t modifiers = parse_attributes(&attributes);
4016
4017         /* pointers */
4018         while (token.type == '*') {
4019                 construct_type_t *type = parse_pointer_declarator();
4020
4021                 if (last == NULL) {
4022                         first = type;
4023                         last  = type;
4024                 } else {
4025                         last->next = type;
4026                         last       = type;
4027                 }
4028
4029                 /* TODO: find out if this is correct */
4030                 modifiers |= parse_attributes(&attributes);
4031         }
4032
4033         if (declaration != NULL)
4034                 declaration->modifiers |= modifiers;
4035
4036         construct_type_t *inner_types = NULL;
4037
4038         switch(token.type) {
4039         case T_IDENTIFIER:
4040                 if (declaration == NULL) {
4041                         errorf(HERE, "no identifier expected in typename");
4042                 } else {
4043                         declaration->symbol          = token.v.symbol;
4044                         declaration->source_position = token.source_position;
4045                 }
4046                 next_token();
4047                 break;
4048         case '(':
4049                 next_token();
4050                 add_anchor_token(')');
4051                 inner_types = parse_inner_declarator(declaration, may_be_abstract);
4052                 if (inner_types != NULL) {
4053                         /* All later declarators only modify the return type, not declaration */
4054                         declaration = NULL;
4055                 }
4056                 rem_anchor_token(')');
4057                 expect(')');
4058                 break;
4059         default:
4060                 if (may_be_abstract)
4061                         break;
4062                 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
4063                 eat_until_anchor();
4064                 return NULL;
4065         }
4066
4067         construct_type_t *p = last;
4068
4069         while(true) {
4070                 construct_type_t *type;
4071                 switch(token.type) {
4072                 case '(':
4073                         type = parse_function_declarator(declaration);
4074                         break;
4075                 case '[':
4076                         type = parse_array_declarator();
4077                         break;
4078                 default:
4079                         goto declarator_finished;
4080                 }
4081
4082                 /* insert in the middle of the list (behind p) */
4083                 if (p != NULL) {
4084                         type->next = p->next;
4085                         p->next    = type;
4086                 } else {
4087                         type->next = first;
4088                         first      = type;
4089                 }
4090                 if (last == p) {
4091                         last = type;
4092                 }
4093         }
4094
4095 declarator_finished:
4096         /* append inner_types at the end of the list, we don't to set last anymore
4097          * as it's not needed anymore */
4098         if (last == NULL) {
4099                 assert(first == NULL);
4100                 first = inner_types;
4101         } else {
4102                 last->next = inner_types;
4103         }
4104
4105         return first;
4106 end_error:
4107         return NULL;
4108 }
4109
4110 static void parse_declaration_attributes(declaration_t *declaration)
4111 {
4112         gnu_attribute_t  *attributes = NULL;
4113         decl_modifiers_t  modifiers  = parse_attributes(&attributes);
4114
4115         if (declaration == NULL)
4116                 return;
4117
4118         declaration->modifiers |= modifiers;
4119         /* check if we have these stupid mode attributes... */
4120         type_t *old_type = declaration->type;
4121         if (old_type == NULL)
4122                 return;
4123
4124         gnu_attribute_t *attribute = attributes;
4125         for ( ; attribute != NULL; attribute = attribute->next) {
4126                 if (attribute->kind != GNU_AK_MODE || attribute->invalid)
4127                         continue;
4128
4129                 atomic_type_kind_t  akind = attribute->u.akind;
4130                 if (!is_type_signed(old_type)) {
4131                         switch(akind) {
4132                         case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break;
4133                         case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break;
4134                         case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break;
4135                         case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_ULONGLONG; break;
4136                         default:
4137                                 panic("invalid akind in mode attribute");
4138                         }
4139                 }
4140                 declaration->type
4141                         = make_atomic_type(akind, old_type->base.qualifiers);
4142         }
4143 }
4144
4145 static type_t *construct_declarator_type(construct_type_t *construct_list,
4146                                          type_t *type)
4147 {
4148         construct_type_t *iter = construct_list;
4149         for( ; iter != NULL; iter = iter->next) {
4150                 switch(iter->kind) {
4151                 case CONSTRUCT_INVALID:
4152                         internal_errorf(HERE, "invalid type construction found");
4153                 case CONSTRUCT_FUNCTION: {
4154                         construct_function_type_t *construct_function_type
4155                                 = (construct_function_type_t*) iter;
4156
4157                         type_t *function_type = construct_function_type->function_type;
4158
4159                         function_type->function.return_type = type;
4160
4161                         type_t *skipped_return_type = skip_typeref(type);
4162                         /* §6.7.5.3(1) */
4163                         if (is_type_function(skipped_return_type)) {
4164                                 errorf(HERE, "function returning function is not allowed");
4165                         } else if (is_type_array(skipped_return_type)) {
4166                                 errorf(HERE, "function returning array is not allowed");
4167                         } else {
4168                                 if (skipped_return_type->base.qualifiers != 0) {
4169                                         warningf(HERE,
4170                                                 "type qualifiers in return type of function type are meaningless");
4171                                 }
4172                         }
4173
4174                         type = function_type;
4175                         break;
4176                 }
4177
4178                 case CONSTRUCT_POINTER: {
4179                         parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
4180                         type_t           *pointer_type   = allocate_type_zero(TYPE_POINTER, &null_position);
4181                         pointer_type->pointer.points_to  = type;
4182                         pointer_type->base.qualifiers    = parsed_pointer->type_qualifiers;
4183
4184                         type = pointer_type;
4185                         break;
4186                 }
4187
4188                 case CONSTRUCT_ARRAY: {
4189                         parsed_array_t *parsed_array  = (parsed_array_t*) iter;
4190                         type_t         *array_type    = allocate_type_zero(TYPE_ARRAY, &null_position);
4191
4192                         expression_t *size_expression = parsed_array->size;
4193                         if (size_expression != NULL) {
4194                                 size_expression
4195                                         = create_implicit_cast(size_expression, type_size_t);
4196                         }
4197
4198                         array_type->base.qualifiers       = parsed_array->type_qualifiers;
4199                         array_type->array.element_type    = type;
4200                         array_type->array.is_static       = parsed_array->is_static;
4201                         array_type->array.is_variable     = parsed_array->is_variable;
4202                         array_type->array.size_expression = size_expression;
4203
4204                         if (size_expression != NULL) {
4205                                 if (is_constant_expression(size_expression)) {
4206                                         array_type->array.size_constant = true;
4207                                         array_type->array.size
4208                                                 = fold_constant(size_expression);
4209                                 } else {
4210                                         array_type->array.is_vla = true;
4211                                 }
4212                         }
4213
4214                         type_t *skipped_type = skip_typeref(type);
4215                         /* §6.7.5.2(1) */
4216                         if (is_type_incomplete(skipped_type)) {
4217                                 errorf(HERE, "array of incomplete type '%T' is not allowed", type);
4218                         } else if (is_type_function(skipped_type)) {
4219                                 errorf(HERE, "array of functions is not allowed");
4220                         }
4221                         type = array_type;
4222                         break;
4223                 }
4224                 }
4225
4226                 type_t *hashed_type = typehash_insert(type);
4227                 if (hashed_type != type) {
4228                         /* the function type was constructed earlier freeing it here will
4229                          * destroy other types... */
4230                         if (iter->kind != CONSTRUCT_FUNCTION) {
4231                                 free_type(type);
4232                         }
4233                         type = hashed_type;
4234                 }
4235         }
4236
4237         return type;
4238 }
4239
4240 static declaration_t *parse_declarator(
4241                 const declaration_specifiers_t *specifiers, bool may_be_abstract)
4242 {
4243         declaration_t *const declaration    = allocate_declaration_zero();
4244         declaration->source_position        = specifiers->source_position;
4245         declaration->declared_storage_class = specifiers->declared_storage_class;
4246         declaration->modifiers              = specifiers->modifiers;
4247         declaration->deprecated_string      = specifiers->deprecated_string;
4248         declaration->get_property_sym       = specifiers->get_property_sym;
4249         declaration->put_property_sym       = specifiers->put_property_sym;
4250         declaration->is_inline              = specifiers->is_inline;
4251
4252         declaration->storage_class          = specifiers->declared_storage_class;
4253         if (declaration->storage_class == STORAGE_CLASS_NONE &&
4254             scope != file_scope) {
4255                 declaration->storage_class = STORAGE_CLASS_AUTO;
4256         }
4257
4258         if (specifiers->alignment != 0) {
4259                 /* TODO: add checks here */
4260                 declaration->alignment = specifiers->alignment;
4261         }
4262
4263         construct_type_t *construct_type
4264                 = parse_inner_declarator(declaration, may_be_abstract);
4265         type_t *const type = specifiers->type;
4266         declaration->type = construct_declarator_type(construct_type, type);
4267
4268         parse_declaration_attributes(declaration);
4269
4270         fix_declaration_type(declaration);
4271
4272         if (construct_type != NULL) {
4273                 obstack_free(&temp_obst, construct_type);
4274         }
4275
4276         return declaration;
4277 }
4278
4279 static type_t *parse_abstract_declarator(type_t *base_type)
4280 {
4281         construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
4282
4283         type_t *result = construct_declarator_type(construct_type, base_type);
4284         if (construct_type != NULL) {
4285                 obstack_free(&temp_obst, construct_type);
4286         }
4287
4288         return result;
4289 }
4290
4291 static declaration_t *append_declaration(declaration_t* const declaration)
4292 {
4293         if (last_declaration != NULL) {
4294                 last_declaration->next = declaration;
4295         } else {
4296                 scope->declarations = declaration;
4297         }
4298         last_declaration = declaration;
4299         return declaration;
4300 }
4301
4302 /**
4303  * Check if the declaration of main is suspicious.  main should be a
4304  * function with external linkage, returning int, taking either zero
4305  * arguments, two, or three arguments of appropriate types, ie.
4306  *
4307  * int main([ int argc, char **argv [, char **env ] ]).
4308  *
4309  * @param decl    the declaration to check
4310  * @param type    the function type of the declaration
4311  */
4312 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
4313 {
4314         if (decl->storage_class == STORAGE_CLASS_STATIC) {
4315                 warningf(&decl->source_position,
4316                          "'main' is normally a non-static function");
4317         }
4318         if (!types_compatible(skip_typeref(func_type->return_type), type_int)) {
4319                 warningf(&decl->source_position,
4320                          "return type of 'main' should be 'int', but is '%T'",
4321                          func_type->return_type);
4322         }
4323         const function_parameter_t *parm = func_type->parameters;
4324         if (parm != NULL) {
4325                 type_t *const first_type = parm->type;
4326                 if (!types_compatible(skip_typeref(first_type), type_int)) {
4327                         warningf(&decl->source_position,
4328                                  "first argument of 'main' should be 'int', but is '%T'", first_type);
4329                 }
4330                 parm = parm->next;
4331                 if (parm != NULL) {
4332                         type_t *const second_type = parm->type;
4333                         if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
4334                                 warningf(&decl->source_position,
4335                                          "second argument of 'main' should be 'char**', but is '%T'", second_type);
4336                         }
4337                         parm = parm->next;
4338                         if (parm != NULL) {
4339                                 type_t *const third_type = parm->type;
4340                                 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
4341                                         warningf(&decl->source_position,
4342                                                  "third argument of 'main' should be 'char**', but is '%T'", third_type);
4343                                 }
4344                                 parm = parm->next;
4345                                 if (parm != NULL)
4346                                         goto warn_arg_count;
4347                         }
4348                 } else {
4349 warn_arg_count:
4350                         warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
4351                 }
4352         }
4353 }
4354
4355 /**
4356  * Check if a symbol is the equal to "main".
4357  */
4358 static bool is_sym_main(const symbol_t *const sym)
4359 {
4360         return strcmp(sym->string, "main") == 0;
4361 }
4362
4363 static declaration_t *record_declaration(
4364         declaration_t *const declaration,
4365         const bool is_definition)
4366 {
4367         const symbol_t *const symbol  = declaration->symbol;
4368         const namespace_t     namespc = (namespace_t)declaration->namespc;
4369
4370         assert(symbol != NULL);
4371         declaration_t *previous_declaration = get_declaration(symbol, namespc);
4372
4373         type_t *const orig_type = declaration->type;
4374         type_t *const type      = skip_typeref(orig_type);
4375         if (is_type_function(type) &&
4376                         type->function.unspecified_parameters &&
4377                         warning.strict_prototypes &&
4378                         previous_declaration == NULL) {
4379                 warningf(&declaration->source_position,
4380                          "function declaration '%#T' is not a prototype",
4381                          orig_type, symbol);
4382         }
4383
4384         if (warning.main && is_type_function(type) && is_sym_main(symbol)) {
4385                 check_type_of_main(declaration, &type->function);
4386         }
4387
4388         if (warning.nested_externs                             &&
4389             declaration->storage_class == STORAGE_CLASS_EXTERN &&
4390             scope                      != file_scope) {
4391                 warningf(&declaration->source_position,
4392                          "nested extern declaration of '%#T'", declaration->type, symbol);
4393         }
4394
4395         assert(declaration != previous_declaration);
4396         if (previous_declaration != NULL &&
4397             previous_declaration->parent_scope->is_parameter &&
4398             scope->depth == previous_declaration->parent_scope->depth + 1) {
4399                 errorf(&declaration->source_position,
4400                         "declaration '%#T' redeclares the parameter '%#T' (declared %P)",
4401                         orig_type, symbol, previous_declaration->type, symbol,
4402                         &previous_declaration->source_position);
4403                 goto finish;
4404         }
4405         if (previous_declaration != NULL &&
4406             previous_declaration->parent_scope == scope) {
4407                 /* can happen for K&R style declarations */
4408                 if (previous_declaration->type == NULL) {
4409                         previous_declaration->type = declaration->type;
4410                 }
4411
4412                 const type_t *prev_type = skip_typeref(previous_declaration->type);
4413                 if (!types_compatible(type, prev_type)) {
4414                         errorf(&declaration->source_position,
4415                                    "declaration '%#T' is incompatible with '%#T' (declared %P)",
4416                                    orig_type, symbol, previous_declaration->type, symbol,
4417                                    &previous_declaration->source_position);
4418                 } else {
4419                         unsigned old_storage_class = previous_declaration->storage_class;
4420                         if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
4421                                 errorf(&declaration->source_position,
4422                                            "redeclaration of enum entry '%Y' (declared %P)",
4423                                            symbol, &previous_declaration->source_position);
4424                                 return previous_declaration;
4425                         }
4426
4427                         if (warning.redundant_decls                                     &&
4428                             is_definition                                               &&
4429                             previous_declaration->storage_class == STORAGE_CLASS_STATIC &&
4430                             !(previous_declaration->modifiers & DM_USED)                &&
4431                             !previous_declaration->used) {
4432                                 warningf(&previous_declaration->source_position,
4433                                          "unnecessary static forward declaration for '%#T'",
4434                                          previous_declaration->type, symbol);
4435                         }
4436
4437                         unsigned new_storage_class = declaration->storage_class;
4438
4439                         if (is_type_incomplete(prev_type)) {
4440                                 previous_declaration->type = type;
4441                                 prev_type                  = type;
4442                         }
4443
4444                         /* pretend no storage class means extern for function
4445                          * declarations (except if the previous declaration is neither
4446                          * none nor extern) */
4447                         if (is_type_function(type)) {
4448                                 if (prev_type->function.unspecified_parameters) {
4449                                         previous_declaration->type = type;
4450                                         prev_type                  = type;
4451                                 }
4452
4453                                 switch (old_storage_class) {
4454                                 case STORAGE_CLASS_NONE:
4455                                         old_storage_class = STORAGE_CLASS_EXTERN;
4456                                         /* FALLTHROUGH */
4457
4458                                 case STORAGE_CLASS_EXTERN:
4459                                         if (is_definition) {
4460                                                 if (warning.missing_prototypes &&
4461                                                     prev_type->function.unspecified_parameters &&
4462                                                     !is_sym_main(symbol)) {
4463                                                         warningf(&declaration->source_position,
4464                                                                          "no previous prototype for '%#T'",
4465                                                                          orig_type, symbol);
4466                                                 }
4467                                         } else if (new_storage_class == STORAGE_CLASS_NONE) {
4468                                                 new_storage_class = STORAGE_CLASS_EXTERN;
4469                                         }
4470                                         break;
4471
4472                                 default:
4473                                         break;
4474                                 }
4475                         }
4476
4477                         if (old_storage_class == STORAGE_CLASS_EXTERN &&
4478                                         new_storage_class == STORAGE_CLASS_EXTERN) {
4479 warn_redundant_declaration:
4480                                 if (!is_definition           &&
4481                                     warning.redundant_decls  &&
4482                                     is_type_valid(prev_type) &&
4483                                     strcmp(previous_declaration->source_position.input_name, "<builtin>") != 0) {
4484                                         warningf(&declaration->source_position,
4485                                                  "redundant declaration for '%Y' (declared %P)",
4486                                                  symbol, &previous_declaration->source_position);
4487                                 }
4488                         } else if (current_function == NULL) {
4489                                 if (old_storage_class != STORAGE_CLASS_STATIC &&
4490                                     new_storage_class == STORAGE_CLASS_STATIC) {
4491                                         errorf(&declaration->source_position,
4492                                                "static declaration of '%Y' follows non-static declaration (declared %P)",
4493                                                symbol, &previous_declaration->source_position);
4494                                 } else if (old_storage_class == STORAGE_CLASS_EXTERN) {
4495                                         previous_declaration->storage_class          = STORAGE_CLASS_NONE;
4496                                         previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
4497                                 } else {
4498                                         goto warn_redundant_declaration;
4499                                 }
4500                         } else if (is_type_valid(prev_type)) {
4501                                 if (old_storage_class == new_storage_class) {
4502                                         errorf(&declaration->source_position,
4503                                                "redeclaration of '%Y' (declared %P)",
4504                                                symbol, &previous_declaration->source_position);
4505                                 } else {
4506                                         errorf(&declaration->source_position,
4507                                                "redeclaration of '%Y' with different linkage (declared %P)",
4508                                                symbol, &previous_declaration->source_position);
4509                                 }
4510                         }
4511                 }
4512
4513                 previous_declaration->modifiers |= declaration->modifiers;
4514                 previous_declaration->is_inline |= declaration->is_inline;
4515                 return previous_declaration;
4516         } else if (is_type_function(type)) {
4517                 if (is_definition &&
4518                     declaration->storage_class != STORAGE_CLASS_STATIC) {
4519                         if (warning.missing_prototypes && !is_sym_main(symbol)) {
4520                                 warningf(&declaration->source_position,
4521                                          "no previous prototype for '%#T'", orig_type, symbol);
4522                         } else if (warning.missing_declarations && !is_sym_main(symbol)) {
4523                                 warningf(&declaration->source_position,
4524                                          "no previous declaration for '%#T'", orig_type,
4525                                          symbol);
4526                         }
4527                 }
4528         } else {
4529                 if (warning.missing_declarations &&
4530                     scope == file_scope && (
4531                       declaration->storage_class == STORAGE_CLASS_NONE ||
4532                       declaration->storage_class == STORAGE_CLASS_THREAD
4533                     )) {
4534                         warningf(&declaration->source_position,
4535                                  "no previous declaration for '%#T'", orig_type, symbol);
4536                 }
4537         }
4538 finish:
4539         assert(declaration->parent_scope == NULL);
4540         assert(scope != NULL);
4541
4542         declaration->parent_scope = scope;
4543
4544         environment_push(declaration);
4545         return append_declaration(declaration);
4546 }
4547
4548 static void parser_error_multiple_definition(declaration_t *declaration,
4549                 const source_position_t *source_position)
4550 {
4551         errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
4552                declaration->symbol, &declaration->source_position);
4553 }
4554
4555 static bool is_declaration_specifier(const token_t *token,
4556                                      bool only_specifiers_qualifiers)
4557 {
4558         switch (token->type) {
4559                 TYPE_SPECIFIERS
4560                 TYPE_QUALIFIERS
4561                         return true;
4562                 case T_IDENTIFIER:
4563                         return is_typedef_symbol(token->v.symbol);
4564
4565                 case T___extension__:
4566                 STORAGE_CLASSES
4567                         return !only_specifiers_qualifiers;
4568
4569                 default:
4570                         return false;
4571         }
4572 }
4573
4574 static void parse_init_declarator_rest(declaration_t *declaration)
4575 {
4576         eat('=');
4577
4578         type_t *orig_type = declaration->type;
4579         type_t *type      = skip_typeref(orig_type);
4580
4581         if (declaration->init.initializer != NULL) {
4582                 parser_error_multiple_definition(declaration, HERE);
4583         }
4584
4585         bool must_be_constant = false;
4586         if (declaration->storage_class == STORAGE_CLASS_STATIC        ||
4587             declaration->storage_class == STORAGE_CLASS_THREAD_STATIC ||
4588             declaration->parent_scope  == file_scope) {
4589                 must_be_constant = true;
4590         }
4591
4592         if (is_type_function(type)) {
4593                 errorf(&declaration->source_position,
4594                        "function '%#T' is initialized like a variable",
4595                        orig_type, declaration->symbol);
4596                 orig_type = type_error_type;
4597         }
4598
4599         parse_initializer_env_t env;
4600         env.type             = orig_type;
4601         env.must_be_constant = must_be_constant;
4602         env.declaration      = current_init_decl = declaration;
4603
4604         initializer_t *initializer = parse_initializer(&env);
4605         current_init_decl = NULL;
4606
4607         if (!is_type_function(type)) {
4608                 /* § 6.7.5 (22)  array initializers for arrays with unknown size determine
4609                  * the array type size */
4610                 declaration->type             = env.type;
4611                 declaration->init.initializer = initializer;
4612         }
4613 }
4614
4615 /* parse rest of a declaration without any declarator */
4616 static void parse_anonymous_declaration_rest(
4617                 const declaration_specifiers_t *specifiers)
4618 {
4619         eat(';');
4620
4621         if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) {
4622                 warningf(&specifiers->source_position,
4623                          "useless storage class in empty declaration");
4624         }
4625
4626         type_t *type = specifiers->type;
4627         switch (type->kind) {
4628                 case TYPE_COMPOUND_STRUCT:
4629                 case TYPE_COMPOUND_UNION: {
4630                         if (type->compound.declaration->symbol == NULL) {
4631                                 warningf(&specifiers->source_position,
4632                                          "unnamed struct/union that defines no instances");
4633                         }
4634                         break;
4635                 }
4636
4637                 case TYPE_ENUM:
4638                         break;
4639
4640                 default:
4641                         warningf(&specifiers->source_position, "empty declaration");
4642                         break;
4643         }
4644
4645 #ifdef RECORD_EMPTY_DECLARATIONS
4646         declaration_t *const declaration    = allocate_declaration_zero();
4647         declaration->type                   = specifiers->type;
4648         declaration->declared_storage_class = specifiers->declared_storage_class;
4649         declaration->source_position        = specifiers->source_position;
4650         declaration->modifiers              = specifiers->modifiers;
4651         declaration->storage_class          = STORAGE_CLASS_NONE;
4652
4653         append_declaration(declaration);
4654 #endif
4655 }
4656
4657 static void parse_declaration_rest(declaration_t *ndeclaration,
4658                 const declaration_specifiers_t *specifiers,
4659                 parsed_declaration_func finished_declaration)
4660 {
4661         add_anchor_token(';');
4662         add_anchor_token(',');
4663         while(true) {
4664                 declaration_t *declaration =
4665                         finished_declaration(ndeclaration, token.type == '=');
4666
4667                 type_t *orig_type = declaration->type;
4668                 type_t *type      = skip_typeref(orig_type);
4669
4670                 if (type->kind != TYPE_FUNCTION &&
4671                     declaration->is_inline &&
4672                     is_type_valid(type)) {
4673                         warningf(&declaration->source_position,
4674                                  "variable '%Y' declared 'inline'\n", declaration->symbol);
4675                 }
4676
4677                 if (token.type == '=') {
4678                         parse_init_declarator_rest(declaration);
4679                 }
4680
4681                 if (token.type != ',')
4682                         break;
4683                 eat(',');
4684
4685                 add_anchor_token('=');
4686                 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4687                 rem_anchor_token('=');
4688         }
4689         expect(';');
4690
4691 end_error:
4692         rem_anchor_token(';');
4693         rem_anchor_token(',');
4694 }
4695
4696 static declaration_t *finished_kr_declaration(declaration_t *declaration, bool is_definition)
4697 {
4698         symbol_t *symbol  = declaration->symbol;
4699         if (symbol == NULL) {
4700                 errorf(HERE, "anonymous declaration not valid as function parameter");
4701                 return declaration;
4702         }
4703         namespace_t namespc = (namespace_t) declaration->namespc;
4704         if (namespc != NAMESPACE_NORMAL) {
4705                 return record_declaration(declaration, false);
4706         }
4707
4708         declaration_t *previous_declaration = get_declaration(symbol, namespc);
4709         if (previous_declaration == NULL ||
4710                         previous_declaration->parent_scope != scope) {
4711                 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4712                        symbol);
4713                 return declaration;
4714         }
4715
4716         if (is_definition) {
4717                 errorf(HERE, "parameter %Y is initialised", declaration->symbol);
4718         }
4719
4720         if (previous_declaration->type == NULL) {
4721                 previous_declaration->type          = declaration->type;
4722                 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4723                 previous_declaration->storage_class = declaration->storage_class;
4724                 previous_declaration->parent_scope  = scope;
4725                 return previous_declaration;
4726         } else {
4727                 return record_declaration(declaration, false);
4728         }
4729 }
4730
4731 static void parse_declaration(parsed_declaration_func finished_declaration)
4732 {
4733         declaration_specifiers_t specifiers;
4734         memset(&specifiers, 0, sizeof(specifiers));
4735
4736         add_anchor_token(';');
4737         parse_declaration_specifiers(&specifiers);
4738         rem_anchor_token(';');
4739
4740         if (token.type == ';') {
4741                 parse_anonymous_declaration_rest(&specifiers);
4742         } else {
4743                 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4744                 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4745         }
4746 }
4747
4748 static type_t *get_default_promoted_type(type_t *orig_type)
4749 {
4750         type_t *result = orig_type;
4751
4752         type_t *type = skip_typeref(orig_type);
4753         if (is_type_integer(type)) {
4754                 result = promote_integer(type);
4755         } else if (type == type_float) {
4756                 result = type_double;
4757         }
4758
4759         return result;
4760 }
4761
4762 static void parse_kr_declaration_list(declaration_t *declaration)
4763 {
4764         type_t *type = skip_typeref(declaration->type);
4765         if (!is_type_function(type))
4766                 return;
4767
4768         if (!type->function.kr_style_parameters)
4769                 return;
4770
4771         add_anchor_token('{');
4772
4773         /* push function parameters */
4774         size_t const top = environment_top();
4775         scope_push(&declaration->scope);
4776
4777         declaration_t *parameter = declaration->scope.declarations;
4778         for ( ; parameter != NULL; parameter = parameter->next) {
4779                 assert(parameter->parent_scope == NULL);
4780                 parameter->parent_scope = scope;
4781                 environment_push(parameter);
4782         }
4783
4784         /* parse declaration list */
4785         while (is_declaration_specifier(&token, false)) {
4786                 parse_declaration(finished_kr_declaration);
4787         }
4788
4789         /* pop function parameters */
4790         assert(scope == &declaration->scope);
4791         scope_pop();
4792         environment_pop_to(top);
4793
4794         /* update function type */
4795         type_t *new_type = duplicate_type(type);
4796
4797         function_parameter_t *parameters     = NULL;
4798         function_parameter_t *last_parameter = NULL;
4799
4800         declaration_t *parameter_declaration = declaration->scope.declarations;
4801         for( ; parameter_declaration != NULL;
4802                         parameter_declaration = parameter_declaration->next) {
4803                 type_t *parameter_type = parameter_declaration->type;
4804                 if (parameter_type == NULL) {
4805                         if (strict_mode) {
4806                                 errorf(HERE, "no type specified for function parameter '%Y'",
4807                                        parameter_declaration->symbol);
4808                         } else {
4809                                 if (warning.implicit_int) {
4810                                         warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4811                                                 parameter_declaration->symbol);
4812                                 }
4813                                 parameter_type              = type_int;
4814                                 parameter_declaration->type = parameter_type;
4815                         }
4816                 }
4817
4818                 semantic_parameter(parameter_declaration);
4819                 parameter_type = parameter_declaration->type;
4820
4821                 /*
4822                  * we need the default promoted types for the function type
4823                  */
4824                 parameter_type = get_default_promoted_type(parameter_type);
4825
4826                 function_parameter_t *function_parameter
4827                         = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4828                 memset(function_parameter, 0, sizeof(function_parameter[0]));
4829
4830                 function_parameter->type = parameter_type;
4831                 if (last_parameter != NULL) {
4832                         last_parameter->next = function_parameter;
4833                 } else {
4834                         parameters = function_parameter;
4835                 }
4836                 last_parameter = function_parameter;
4837         }
4838
4839         /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4840          * prototype */
4841         new_type->function.parameters             = parameters;
4842         new_type->function.unspecified_parameters = true;
4843
4844         type = typehash_insert(new_type);
4845         if (type != new_type) {
4846                 obstack_free(type_obst, new_type);
4847         }
4848
4849         declaration->type = type;
4850
4851         rem_anchor_token('{');
4852 }
4853
4854 static bool first_err = true;
4855
4856 /**
4857  * When called with first_err set, prints the name of the current function,
4858  * else does noting.
4859  */
4860 static void print_in_function(void)
4861 {
4862         if (first_err) {
4863                 first_err = false;
4864                 diagnosticf("%s: In function '%Y':\n",
4865                         current_function->source_position.input_name,
4866                         current_function->symbol);
4867         }
4868 }
4869
4870 /**
4871  * Check if all labels are defined in the current function.
4872  * Check if all labels are used in the current function.
4873  */
4874 static void check_labels(void)
4875 {
4876         for (const goto_statement_t *goto_statement = goto_first;
4877             goto_statement != NULL;
4878             goto_statement = goto_statement->next) {
4879                 /* skip computed gotos */
4880                 if (goto_statement->expression != NULL)
4881                         continue;
4882
4883                 declaration_t *label = goto_statement->label;
4884
4885                 label->used = true;
4886                 if (label->source_position.input_name == NULL) {
4887                         print_in_function();
4888                         errorf(&goto_statement->base.source_position,
4889                                "label '%Y' used but not defined", label->symbol);
4890                  }
4891         }
4892         goto_first = goto_last = NULL;
4893
4894         if (warning.unused_label) {
4895                 for (const label_statement_t *label_statement = label_first;
4896                          label_statement != NULL;
4897                          label_statement = label_statement->next) {
4898                         const declaration_t *label = label_statement->label;
4899
4900                         if (! label->used) {
4901                                 print_in_function();
4902                                 warningf(&label_statement->base.source_position,
4903                                         "label '%Y' defined but not used", label->symbol);
4904                         }
4905                 }
4906         }
4907         label_first = label_last = NULL;
4908 }
4909
4910 /**
4911  * Check declarations of current_function for unused entities.
4912  */
4913 static void check_declarations(void)
4914 {
4915         if (warning.unused_parameter) {
4916                 const scope_t *scope = &current_function->scope;
4917
4918                 if (is_sym_main(current_function->symbol)) {
4919                         /* do not issue unused warnings for main */
4920                         return;
4921                 }
4922                 const declaration_t *parameter = scope->declarations;
4923                 for (; parameter != NULL; parameter = parameter->next) {
4924                         if (! parameter->used) {
4925                                 print_in_function();
4926                                 warningf(&parameter->source_position,
4927                                          "unused parameter '%Y'", parameter->symbol);
4928                         }
4929                 }
4930         }
4931         if (warning.unused_variable) {
4932         }
4933 }
4934
4935 static int determine_truth(expression_t const* const cond)
4936 {
4937         return
4938                 !is_constant_expression(cond) ? 0 :
4939                 fold_constant(cond) != 0      ? 1 :
4940                 -1;
4941 }
4942
4943 static bool noreturn_candidate;
4944
4945 static void check_reachable(statement_t *const stmt)
4946 {
4947         if (stmt->base.reachable)
4948                 return;
4949         if (stmt->kind != STATEMENT_DO_WHILE)
4950                 stmt->base.reachable = true;
4951
4952         statement_t *last = stmt;
4953         statement_t *next;
4954         switch (stmt->kind) {
4955                 case STATEMENT_INVALID:
4956                 case STATEMENT_EMPTY:
4957                 case STATEMENT_DECLARATION:
4958                 case STATEMENT_ASM:
4959                         next = stmt->base.next;
4960                         break;
4961
4962                 case STATEMENT_COMPOUND:
4963                         next = stmt->compound.statements;
4964                         break;
4965
4966                 case STATEMENT_RETURN:
4967                         noreturn_candidate = false;
4968                         return;
4969
4970                 case STATEMENT_IF: {
4971                         if_statement_t const* const ifs = &stmt->ifs;
4972                         int            const        val = determine_truth(ifs->condition);
4973
4974                         if (val >= 0)
4975                                 check_reachable(ifs->true_statement);
4976
4977                         if (val > 0)
4978                                 return;
4979
4980                         if (ifs->false_statement != NULL) {
4981                                 check_reachable(ifs->false_statement);
4982                                 return;
4983                         }
4984
4985                         next = stmt->base.next;
4986                         break;
4987                 }
4988
4989                 case STATEMENT_SWITCH: {
4990                         switch_statement_t const *const switchs = &stmt->switchs;
4991                         expression_t       const *const expr    = switchs->expression;
4992
4993                         if (is_constant_expression(expr)) {
4994                                 long                    const val      = fold_constant(expr);
4995                                 case_label_statement_t *      defaults = NULL;
4996                                 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
4997                                         if (i->expression == NULL) {
4998                                                 defaults = i;
4999                                                 continue;
5000                                         }
5001
5002                                         if (i->first_case <= val && val <= i->last_case) {
5003                                                 check_reachable((statement_t*)i);
5004                                                 return;
5005                                         }
5006                                 }
5007
5008                                 if (defaults != NULL) {
5009                                         check_reachable((statement_t*)defaults);
5010                                         return;
5011                                 }
5012                         } else {
5013                                 bool has_default = false;
5014                                 for (case_label_statement_t *i = switchs->first_case; i != NULL; i = i->next) {
5015                                         if (i->expression == NULL)
5016                                                 has_default = true;
5017
5018                                         check_reachable((statement_t*)i);
5019                                 }
5020
5021                                 if (has_default)
5022                                         return;
5023                         }
5024
5025                         next = stmt->base.next;
5026                         break;
5027                 }
5028
5029                 case STATEMENT_EXPRESSION: {
5030                         /* Check for noreturn function call */
5031                         expression_t const *const expr = stmt->expression.expression;
5032                         if (expr->kind == EXPR_CALL) {
5033                                 expression_t const *const func = expr->call.function;
5034                                 if (func->kind == EXPR_REFERENCE) {
5035                                         declaration_t const *const decl = func->reference.declaration;
5036                                         if (decl != NULL && decl->modifiers & DM_NORETURN) {
5037                                                 return;
5038                                         }
5039                                 }
5040                         }
5041
5042                         next = stmt->base.next;
5043                         break;
5044                 }
5045
5046                 case STATEMENT_CONTINUE: {
5047                         statement_t *parent = stmt;
5048                         for (;;) {
5049                                 parent = parent->base.parent;
5050                                 if (parent == NULL) /* continue not within loop */
5051                                         return;
5052
5053                                 next = parent;
5054                                 switch (parent->kind) {
5055                                         case STATEMENT_WHILE:    goto continue_while;
5056                                         case STATEMENT_DO_WHILE: goto continue_do_while;
5057                                         case STATEMENT_FOR:      goto continue_for;
5058
5059                                         default: break;
5060                                 }
5061                         }
5062                 }
5063
5064                 case STATEMENT_BREAK: {
5065                         statement_t *parent = stmt;
5066                         for (;;) {
5067                                 parent = parent->base.parent;
5068                                 if (parent == NULL) /* break not within loop/switch */
5069                                         return;
5070
5071                                 switch (parent->kind) {
5072                                         case STATEMENT_SWITCH:
5073                                         case STATEMENT_WHILE:
5074                                         case STATEMENT_DO_WHILE:
5075                                         case STATEMENT_FOR:
5076                                                 last = parent;
5077                                                 next = parent->base.next;
5078                                                 goto found_break_parent;
5079
5080                                         default: break;
5081                                 }
5082                         }
5083 found_break_parent:
5084                         break;
5085                 }
5086
5087                 case STATEMENT_GOTO:
5088                         if (stmt->gotos.expression) {
5089                                 statement_t *parent = stmt->base.parent;
5090                                 if (parent == NULL) /* top level goto */
5091                                         return;
5092                                 next = parent;
5093                         } else {
5094                                 next = stmt->gotos.label->init.statement;
5095                                 if (next == NULL) /* missing label */
5096                                         return;
5097                         }
5098                         break;
5099
5100                 case STATEMENT_LABEL:
5101                         next = stmt->label.statement;
5102                         break;
5103
5104                 case STATEMENT_CASE_LABEL:
5105                         next = stmt->case_label.statement;
5106                         break;
5107
5108                 case STATEMENT_WHILE: {
5109                         while_statement_t const *const whiles = &stmt->whiles;
5110                         int                      const val    = determine_truth(whiles->condition);
5111
5112                         if (val >= 0)
5113                                 check_reachable(whiles->body);
5114
5115                         if (val > 0)
5116                                 return;
5117
5118                         next = stmt->base.next;
5119                         break;
5120                 }
5121
5122                 case STATEMENT_DO_WHILE:
5123                         next = stmt->do_while.body;
5124                         break;
5125
5126                 case STATEMENT_FOR: {
5127                         for_statement_t *const fors = &stmt->fors;
5128
5129                         if (fors->condition_reachable)
5130                                 return;
5131                         fors->condition_reachable = true;
5132
5133                         expression_t const *const cond = fors->condition;
5134                         int          const        val  =
5135                                 cond == NULL ? 1 : determine_truth(cond);
5136
5137                         if (val >= 0)
5138                                 check_reachable(fors->body);
5139
5140                         if (val > 0)
5141                                 return;
5142
5143                         next = stmt->base.next;
5144                         break;
5145                 }
5146
5147                 case STATEMENT_MS_TRY: {
5148                         ms_try_statement_t const *const ms_try = &stmt->ms_try;
5149                         check_reachable(ms_try->try_statement);
5150                         next = ms_try->final_statement;
5151                         break;
5152                 }
5153
5154                 case STATEMENT_LEAVE: {
5155                         statement_t *parent = stmt;
5156                         for (;;) {
5157                                 parent = parent->base.parent;
5158                                 if (parent == NULL) /* __leave not within __try */
5159                                         return;
5160
5161                                 if (parent->kind == STATEMENT_MS_TRY) {
5162                                         last = parent;
5163                                         next = parent->ms_try.final_statement;
5164                                         break;
5165                                 }
5166                         }
5167                         break;
5168                 }
5169         }
5170
5171         while (next == NULL) {
5172                 next = last->base.parent;
5173                 if (next == NULL) {
5174                         noreturn_candidate = false;
5175
5176                         type_t *const type = current_function->type;
5177                         assert(is_type_function(type));
5178                         type_t *const ret  = skip_typeref(type->function.return_type);
5179                         if (warning.return_type                    &&
5180                             !is_type_atomic(ret, ATOMIC_TYPE_VOID) &&
5181                             is_type_valid(ret)                     &&
5182                             !is_sym_main(current_function->symbol)) {
5183                                 warningf(&stmt->base.source_position,
5184                                          "control reaches end of non-void function");
5185                         }
5186                         return;
5187                 }
5188
5189                 switch (next->kind) {
5190                         case STATEMENT_INVALID:
5191                         case STATEMENT_EMPTY:
5192                         case STATEMENT_DECLARATION:
5193                         case STATEMENT_EXPRESSION:
5194                         case STATEMENT_ASM:
5195                         case STATEMENT_RETURN:
5196                         case STATEMENT_CONTINUE:
5197                         case STATEMENT_BREAK:
5198                         case STATEMENT_GOTO:
5199                         case STATEMENT_LEAVE:
5200                                 panic("invalid control flow in function");
5201
5202                         case STATEMENT_COMPOUND:
5203                         case STATEMENT_IF:
5204                         case STATEMENT_SWITCH:
5205                         case STATEMENT_LABEL:
5206                         case STATEMENT_CASE_LABEL:
5207                                 last = next;
5208                                 next = next->base.next;
5209                                 break;
5210
5211                         case STATEMENT_WHILE: {
5212 continue_while:
5213                                 if (next->base.reachable)
5214                                         return;
5215                                 next->base.reachable = true;
5216
5217                                 while_statement_t const *const whiles = &next->whiles;
5218                                 int                      const val    = determine_truth(whiles->condition);
5219
5220                                 if (val >= 0)
5221                                         check_reachable(whiles->body);
5222
5223                                 if (val > 0)
5224                                         return;
5225
5226                                 last = next;
5227                                 next = next->base.next;
5228                                 break;
5229                         }
5230
5231                         case STATEMENT_DO_WHILE: {
5232 continue_do_while:
5233                                 if (next->base.reachable)
5234                                         return;
5235                                 next->base.reachable = true;
5236
5237                                 do_while_statement_t const *const dw  = &next->do_while;
5238                                 int                  const        val = determine_truth(dw->condition);
5239
5240                                 if (val >= 0)
5241                                         check_reachable(dw->body);
5242
5243                                 if (val > 0)
5244                                         return;
5245
5246                                 last = next;
5247                                 next = next->base.next;
5248                                 break;
5249                         }
5250
5251                         case STATEMENT_FOR: {
5252 continue_for:;
5253                                 for_statement_t *const fors = &next->fors;
5254
5255                                 fors->step_reachable = true;
5256
5257                                 if (fors->condition_reachable)
5258                                         return;
5259                                 fors->condition_reachable = true;
5260
5261                                 expression_t const *const cond = fors->condition;
5262                                 int          const        val  =
5263                                         cond == NULL ? 1 : determine_truth(cond);
5264
5265                                 if (val >= 0)
5266                                         check_reachable(fors->body);
5267
5268                                 if (val > 0)
5269                                         return;
5270
5271                                 last = next;
5272                                 next = next->base.next;
5273                                 break;
5274                         }
5275
5276                         case STATEMENT_MS_TRY:
5277                                 last = next;
5278                                 next = next->ms_try.final_statement;
5279                                 break;
5280                 }
5281         }
5282
5283         if (next == NULL) {
5284                 next = stmt->base.parent;
5285                 if (next == NULL) {
5286                         warningf(&stmt->base.source_position,
5287                                  "control reaches end of non-void function");
5288                 }
5289         }
5290
5291         check_reachable(next);
5292 }
5293
5294 static void check_unreachable(statement_t const* const stmt)
5295 {
5296         if (!stmt->base.reachable            &&
5297             stmt->kind != STATEMENT_DO_WHILE &&
5298             stmt->kind != STATEMENT_FOR      &&
5299             (stmt->kind != STATEMENT_COMPOUND || stmt->compound.statements == NULL)) {
5300                 warningf(&stmt->base.source_position, "statement is unreachable");
5301         }
5302
5303         switch (stmt->kind) {
5304                 case STATEMENT_INVALID:
5305                 case STATEMENT_EMPTY:
5306                 case STATEMENT_RETURN:
5307                 case STATEMENT_DECLARATION:
5308                 case STATEMENT_EXPRESSION:
5309                 case STATEMENT_CONTINUE:
5310                 case STATEMENT_BREAK:
5311                 case STATEMENT_GOTO:
5312                 case STATEMENT_ASM:
5313                 case STATEMENT_LEAVE:
5314                         break;
5315
5316                 case STATEMENT_COMPOUND:
5317                         if (stmt->compound.statements)
5318                                 check_unreachable(stmt->compound.statements);
5319                         break;
5320
5321                 case STATEMENT_IF:
5322                         check_unreachable(stmt->ifs.true_statement);
5323                         if (stmt->ifs.false_statement != NULL)
5324                                 check_unreachable(stmt->ifs.false_statement);
5325                         break;
5326
5327                 case STATEMENT_SWITCH:
5328                         check_unreachable(stmt->switchs.body);
5329                         break;
5330
5331                 case STATEMENT_LABEL:
5332                         check_unreachable(stmt->label.statement);
5333                         break;
5334
5335                 case STATEMENT_CASE_LABEL:
5336                         check_unreachable(stmt->case_label.statement);
5337                         break;
5338
5339                 case STATEMENT_WHILE:
5340                         check_unreachable(stmt->whiles.body);
5341                         break;
5342
5343                 case STATEMENT_DO_WHILE:
5344                         check_unreachable(stmt->do_while.body);
5345                         if (!stmt->base.reachable) {
5346                                 expression_t const *const cond = stmt->do_while.condition;
5347                                 if (determine_truth(cond) >= 0) {
5348                                         warningf(&cond->base.source_position,
5349                                                  "condition of do-while-loop is unreachable");
5350                                 }
5351                         }
5352                         break;
5353
5354                 case STATEMENT_FOR: {
5355                         for_statement_t const* const fors = &stmt->fors;
5356
5357                         // if init and step are unreachable, cond is unreachable, too
5358                         if (!stmt->base.reachable && !fors->step_reachable) {
5359                                 warningf(&stmt->base.source_position, "statement is unreachable");
5360                         } else {
5361                                 if (!stmt->base.reachable && fors->initialisation != NULL) {
5362                                         warningf(&fors->initialisation->base.source_position,
5363                                                  "initialisation of for-statement is unreachable");
5364                                 }
5365
5366                                 if (!fors->condition_reachable && fors->condition != NULL) {
5367                                         warningf(&fors->condition->base.source_position,
5368                                                  "condition of for-statement is unreachable");
5369                                 }
5370
5371                                 if (!fors->step_reachable && fors->step != NULL) {
5372                                         warningf(&fors->step->base.source_position,
5373                                                  "step of for-statement is unreachable");
5374                                 }
5375                         }
5376
5377                         check_unreachable(fors->body);
5378                         break;
5379                 }
5380
5381                 case STATEMENT_MS_TRY: {
5382                         ms_try_statement_t const *const ms_try = &stmt->ms_try;
5383                         check_unreachable(ms_try->try_statement);
5384                         check_unreachable(ms_try->final_statement);
5385                 }
5386         }
5387
5388         if (stmt->base.next)
5389                 check_unreachable(stmt->base.next);
5390 }
5391
5392 static void parse_external_declaration(void)
5393 {
5394         /* function-definitions and declarations both start with declaration
5395          * specifiers */
5396         declaration_specifiers_t specifiers;
5397         memset(&specifiers, 0, sizeof(specifiers));
5398
5399         add_anchor_token(';');
5400         parse_declaration_specifiers(&specifiers);
5401         rem_anchor_token(';');
5402
5403         /* must be a declaration */
5404         if (token.type == ';') {
5405                 parse_anonymous_declaration_rest(&specifiers);
5406                 return;
5407         }
5408
5409         add_anchor_token(',');
5410         add_anchor_token('=');
5411         add_anchor_token(';');
5412         add_anchor_token('{');
5413
5414         /* declarator is common to both function-definitions and declarations */
5415         declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
5416
5417         rem_anchor_token('{');
5418         rem_anchor_token(';');
5419         rem_anchor_token('=');
5420         rem_anchor_token(',');
5421
5422         /* must be a declaration */
5423         switch (token.type) {
5424                 case ',':
5425                 case ';':
5426                 case '=':
5427                         parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
5428                         return;
5429         }
5430
5431         /* must be a function definition */
5432         parse_kr_declaration_list(ndeclaration);
5433
5434         if (token.type != '{') {
5435                 parse_error_expected("while parsing function definition", '{', NULL);
5436                 eat_until_matching_token(';');
5437                 return;
5438         }
5439
5440         type_t *type = ndeclaration->type;
5441
5442         /* note that we don't skip typerefs: the standard doesn't allow them here
5443          * (so we can't use is_type_function here) */
5444         if (type->kind != TYPE_FUNCTION) {
5445                 if (is_type_valid(type)) {
5446                         errorf(HERE, "declarator '%#T' has a body but is not a function type",
5447                                type, ndeclaration->symbol);
5448                 }
5449                 eat_block();
5450                 return;
5451         }
5452
5453         if (warning.aggregate_return &&
5454             is_type_compound(skip_typeref(type->function.return_type))) {
5455                 warningf(HERE, "function '%Y' returns an aggregate",
5456                          ndeclaration->symbol);
5457         }
5458         if (warning.traditional && !type->function.unspecified_parameters) {
5459                 warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'",
5460                         ndeclaration->symbol);
5461         }
5462         if (warning.old_style_definition && type->function.unspecified_parameters) {
5463                 warningf(HERE, "old-style function definition '%Y'",
5464                         ndeclaration->symbol);
5465         }
5466
5467         /* § 6.7.5.3 (14) a function definition with () means no
5468          * parameters (and not unspecified parameters) */
5469         if (type->function.unspecified_parameters
5470                         && type->function.parameters == NULL
5471                         && !type->function.kr_style_parameters) {
5472                 type_t *duplicate = duplicate_type(type);
5473                 duplicate->function.unspecified_parameters = false;
5474
5475                 type = typehash_insert(duplicate);
5476                 if (type != duplicate) {
5477                         obstack_free(type_obst, duplicate);
5478                 }
5479                 ndeclaration->type = type;
5480         }
5481
5482         declaration_t *const declaration = record_declaration(ndeclaration, true);
5483         if (ndeclaration != declaration) {
5484                 declaration->scope = ndeclaration->scope;
5485         }
5486         type = skip_typeref(declaration->type);
5487
5488         /* push function parameters and switch scope */
5489         size_t const top = environment_top();
5490         scope_push(&declaration->scope);
5491
5492         declaration_t *parameter = declaration->scope.declarations;
5493         for( ; parameter != NULL; parameter = parameter->next) {
5494                 if (parameter->parent_scope == &ndeclaration->scope) {
5495                         parameter->parent_scope = scope;
5496                 }
5497                 assert(parameter->parent_scope == NULL
5498                                 || parameter->parent_scope == scope);
5499                 parameter->parent_scope = scope;
5500                 if (parameter->symbol == NULL) {
5501                         errorf(&parameter->source_position, "parameter name omitted");
5502                         continue;
5503                 }
5504                 environment_push(parameter);
5505         }
5506
5507         if (declaration->init.statement != NULL) {
5508                 parser_error_multiple_definition(declaration, HERE);
5509                 eat_block();
5510         } else {
5511                 /* parse function body */
5512                 int            label_stack_top      = label_top();
5513                 declaration_t *old_current_function = current_function;
5514                 current_function                    = declaration;
5515                 current_parent                      = NULL;
5516
5517                 statement_t *const body = parse_compound_statement(false);
5518                 declaration->init.statement = body;
5519                 first_err = true;
5520                 check_labels();
5521                 check_declarations();
5522                 if (warning.return_type      ||
5523                     warning.unreachable_code ||
5524                     (warning.missing_noreturn && !(declaration->modifiers & DM_NORETURN))) {
5525                         noreturn_candidate = true;
5526                         check_reachable(body);
5527                         if (warning.unreachable_code)
5528                                 check_unreachable(body);
5529                         if (warning.missing_noreturn &&
5530                             noreturn_candidate       &&
5531                             !(declaration->modifiers & DM_NORETURN)) {
5532                                 warningf(&body->base.source_position,
5533                                          "function '%#T' is candidate for attribute 'noreturn'",
5534                                          type, declaration->symbol);
5535                         }
5536                 }
5537
5538                 assert(current_parent   == NULL);
5539                 assert(current_function == declaration);
5540                 current_function = old_current_function;
5541                 label_pop_to(label_stack_top);
5542         }
5543
5544         assert(scope == &declaration->scope);
5545         scope_pop();
5546         environment_pop_to(top);
5547 }
5548
5549 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
5550                                   source_position_t *source_position,
5551                                   const symbol_t *symbol)
5552 {
5553         type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
5554
5555         type->bitfield.base_type       = base_type;
5556         type->bitfield.size_expression = size;
5557
5558         il_size_t bit_size;
5559         type_t *skipped_type = skip_typeref(base_type);
5560         if (!is_type_integer(skipped_type)) {
5561                 errorf(HERE, "bitfield base type '%T' is not an integer type",
5562                         base_type);
5563                 bit_size = 0;
5564         } else {
5565                 bit_size = skipped_type->base.size * 8;
5566         }
5567
5568         if (is_constant_expression(size)) {
5569                 long v = fold_constant(size);
5570
5571                 if (v < 0) {
5572                         errorf(source_position, "negative width in bit-field '%Y'",
5573                                 symbol);
5574                 } else if (v == 0) {
5575                         errorf(source_position, "zero width for bit-field '%Y'",
5576                                 symbol);
5577                 } else if (bit_size > 0 && (il_size_t)v > bit_size) {
5578                         errorf(source_position, "width of '%Y' exceeds its type",
5579                                 symbol);
5580                 } else {
5581                         type->bitfield.bit_size = v;
5582                 }
5583         }
5584
5585         return type;
5586 }
5587
5588 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
5589                                           symbol_t *symbol)
5590 {
5591         declaration_t *iter = compound_declaration->scope.declarations;
5592         for( ; iter != NULL; iter = iter->next) {
5593                 if (iter->namespc != NAMESPACE_NORMAL)
5594                         continue;
5595
5596                 if (iter->symbol == NULL) {
5597                         type_t *type = skip_typeref(iter->type);
5598                         if (is_type_compound(type)) {
5599                                 declaration_t *result
5600                                         = find_compound_entry(type->compound.declaration, symbol);
5601                                 if (result != NULL)
5602                                         return result;
5603                         }
5604                         continue;
5605                 }
5606
5607                 if (iter->symbol == symbol) {
5608                         return iter;
5609                 }
5610         }
5611
5612         return NULL;
5613 }
5614
5615 static void parse_compound_declarators(declaration_t *struct_declaration,
5616                 const declaration_specifiers_t *specifiers)
5617 {
5618         declaration_t *last_declaration = struct_declaration->scope.declarations;
5619         if (last_declaration != NULL) {
5620                 while (last_declaration->next != NULL) {
5621                         last_declaration = last_declaration->next;
5622                 }
5623         }
5624
5625         while (true) {
5626                 declaration_t *declaration;
5627
5628                 if (token.type == ':') {
5629                         source_position_t source_position = *HERE;
5630                         next_token();
5631
5632                         type_t *base_type = specifiers->type;
5633                         expression_t *size = parse_constant_expression();
5634
5635                         type_t *type = make_bitfield_type(base_type, size,
5636                                         &source_position, sym_anonymous);
5637
5638                         declaration                         = allocate_declaration_zero();
5639                         declaration->namespc                = NAMESPACE_NORMAL;
5640                         declaration->declared_storage_class = STORAGE_CLASS_NONE;
5641                         declaration->storage_class          = STORAGE_CLASS_NONE;
5642                         declaration->source_position        = source_position;
5643                         declaration->modifiers              = specifiers->modifiers;
5644                         declaration->type                   = type;
5645                 } else {
5646                         declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
5647
5648                         type_t *orig_type = declaration->type;
5649                         type_t *type      = skip_typeref(orig_type);
5650
5651                         if (token.type == ':') {
5652                                 source_position_t source_position = *HERE;
5653                                 next_token();
5654                                 expression_t *size = parse_constant_expression();
5655
5656                                 type_t *bitfield_type = make_bitfield_type(orig_type, size,
5657                                                 &source_position, declaration->symbol);
5658                                 declaration->type = bitfield_type;
5659                         } else {
5660                                 /* TODO we ignore arrays for now... what is missing is a check
5661                                  * that they're at the end of the struct */
5662                                 if (is_type_incomplete(type) && !is_type_array(type)) {
5663                                         errorf(HERE,
5664                                                "compound member '%Y' has incomplete type '%T'",
5665                                                declaration->symbol, orig_type);
5666                                 } else if (is_type_function(type)) {
5667                                         errorf(HERE, "compound member '%Y' must not have function type '%T'",
5668                                                declaration->symbol, orig_type);
5669                                 }
5670                         }
5671                 }
5672
5673                 /* make sure we don't define a symbol multiple times */
5674                 symbol_t *symbol = declaration->symbol;
5675                 if (symbol != NULL) {
5676                         declaration_t *prev_decl
5677                                 = find_compound_entry(struct_declaration, symbol);
5678
5679                         if (prev_decl != NULL) {
5680                                 assert(prev_decl->symbol == symbol);
5681                                 errorf(&declaration->source_position,
5682                                        "multiple declarations of symbol '%Y' (declared %P)",
5683                                        symbol, &prev_decl->source_position);
5684                         }
5685                 }
5686
5687                 /* append declaration */
5688                 if (last_declaration != NULL) {
5689                         last_declaration->next = declaration;
5690                 } else {
5691                         struct_declaration->scope.declarations = declaration;
5692                 }
5693                 last_declaration = declaration;
5694
5695                 if (token.type != ',')
5696                         break;
5697                 next_token();
5698         }
5699         expect(';');
5700
5701 end_error:
5702         ;
5703 }
5704
5705 static void parse_compound_type_entries(declaration_t *compound_declaration)
5706 {
5707         eat('{');
5708         add_anchor_token('}');
5709
5710         while (token.type != '}') {
5711                 if (token.type == T_EOF) {
5712                         errorf(HERE, "EOF while parsing struct");
5713                         break;
5714                 }
5715                 declaration_specifiers_t specifiers;
5716                 memset(&specifiers, 0, sizeof(specifiers));
5717                 parse_declaration_specifiers(&specifiers);
5718
5719                 parse_compound_declarators(compound_declaration, &specifiers);
5720         }
5721         rem_anchor_token('}');
5722         next_token();
5723 }
5724
5725 static type_t *parse_typename(void)
5726 {
5727         declaration_specifiers_t specifiers;
5728         memset(&specifiers, 0, sizeof(specifiers));
5729         parse_declaration_specifiers(&specifiers);
5730         if (specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
5731                 /* TODO: improve error message, user does probably not know what a
5732                  * storage class is...
5733                  */
5734                 errorf(HERE, "typename may not have a storage class");
5735         }
5736
5737         type_t *result = parse_abstract_declarator(specifiers.type);
5738
5739         return result;
5740 }
5741
5742
5743
5744
5745 typedef expression_t* (*parse_expression_function) (unsigned precedence);
5746 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
5747                                                           expression_t *left);
5748
5749 typedef struct expression_parser_function_t expression_parser_function_t;
5750 struct expression_parser_function_t {
5751         unsigned                         precedence;
5752         parse_expression_function        parser;
5753         unsigned                         infix_precedence;
5754         parse_expression_infix_function  infix_parser;
5755 };
5756
5757 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
5758
5759 /**
5760  * Prints an error message if an expression was expected but not read
5761  */
5762 static expression_t *expected_expression_error(void)
5763 {
5764         /* skip the error message if the error token was read */
5765         if (token.type != T_ERROR) {
5766                 errorf(HERE, "expected expression, got token '%K'", &token);
5767         }
5768         next_token();
5769
5770         return create_invalid_expression();
5771 }
5772
5773 /**
5774  * Parse a string constant.
5775  */
5776 static expression_t *parse_string_const(void)
5777 {
5778         wide_string_t wres;
5779         if (token.type == T_STRING_LITERAL) {
5780                 string_t res = token.v.string;
5781                 next_token();
5782                 while (token.type == T_STRING_LITERAL) {
5783                         res = concat_strings(&res, &token.v.string);
5784                         next_token();
5785                 }
5786                 if (token.type != T_WIDE_STRING_LITERAL) {
5787                         expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
5788                         /* note: that we use type_char_ptr here, which is already the
5789                          * automatic converted type. revert_automatic_type_conversion
5790                          * will construct the array type */
5791                         cnst->base.type    = warning.write_strings ? type_const_char_ptr : type_char_ptr;
5792                         cnst->string.value = res;
5793                         return cnst;
5794                 }
5795
5796                 wres = concat_string_wide_string(&res, &token.v.wide_string);
5797         } else {
5798                 wres = token.v.wide_string;
5799         }
5800         next_token();
5801
5802         for (;;) {
5803                 switch (token.type) {
5804                         case T_WIDE_STRING_LITERAL:
5805                                 wres = concat_wide_strings(&wres, &token.v.wide_string);
5806                                 break;
5807
5808                         case T_STRING_LITERAL:
5809                                 wres = concat_wide_string_string(&wres, &token.v.string);
5810                                 break;
5811
5812                         default: {
5813                                 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
5814                                 cnst->base.type         = warning.write_strings ? type_const_wchar_t_ptr : type_wchar_t_ptr;
5815                                 cnst->wide_string.value = wres;
5816                                 return cnst;
5817                         }
5818                 }
5819                 next_token();
5820         }
5821 }
5822
5823 /**
5824  * Parse an integer constant.
5825  */
5826 static expression_t *parse_int_const(void)
5827 {
5828         expression_t *cnst         = allocate_expression_zero(EXPR_CONST);
5829         cnst->base.source_position = *HERE;
5830         cnst->base.type            = token.datatype;
5831         cnst->conste.v.int_value   = token.v.intvalue;
5832
5833         next_token();
5834
5835         return cnst;
5836 }
5837
5838 /**
5839  * Parse a character constant.
5840  */
5841 static expression_t *parse_character_constant(void)
5842 {
5843         expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
5844
5845         cnst->base.source_position = *HERE;
5846         cnst->base.type            = token.datatype;
5847         cnst->conste.v.character   = token.v.string;
5848
5849         if (cnst->conste.v.character.size != 1) {
5850                 if (warning.multichar && GNU_MODE) {
5851                         warningf(HERE, "multi-character character constant");
5852                 } else {
5853                         errorf(HERE, "more than 1 characters in character constant");
5854                 }
5855         }
5856         next_token();
5857
5858         return cnst;
5859 }
5860
5861 /**
5862  * Parse a wide character constant.
5863  */
5864 static expression_t *parse_wide_character_constant(void)
5865 {
5866         expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
5867
5868         cnst->base.source_position    = *HERE;
5869         cnst->base.type               = token.datatype;
5870         cnst->conste.v.wide_character = token.v.wide_string;
5871
5872         if (cnst->conste.v.wide_character.size != 1) {
5873                 if (warning.multichar && GNU_MODE) {
5874                         warningf(HERE, "multi-character character constant");
5875                 } else {
5876                         errorf(HERE, "more than 1 characters in character constant");
5877                 }
5878         }
5879         next_token();
5880
5881         return cnst;
5882 }
5883
5884 /**
5885  * Parse a float constant.
5886  */
5887 static expression_t *parse_float_const(void)
5888 {
5889         expression_t *cnst         = allocate_expression_zero(EXPR_CONST);
5890         cnst->base.type            = token.datatype;
5891         cnst->conste.v.float_value = token.v.floatvalue;
5892
5893         next_token();
5894
5895         return cnst;
5896 }
5897
5898 static declaration_t *create_implicit_function(symbol_t *symbol,
5899                 const source_position_t *source_position)
5900 {
5901         type_t *ntype                          = allocate_type_zero(TYPE_FUNCTION, source_position);
5902         ntype->function.return_type            = type_int;
5903         ntype->function.unspecified_parameters = true;
5904
5905         type_t *type = typehash_insert(ntype);
5906         if (type != ntype) {
5907                 free_type(ntype);
5908         }
5909
5910         declaration_t *const declaration    = allocate_declaration_zero();
5911         declaration->storage_class          = STORAGE_CLASS_EXTERN;
5912         declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
5913         declaration->type                   = type;
5914         declaration->symbol                 = symbol;
5915         declaration->source_position        = *source_position;
5916         declaration->implicit               = true;
5917
5918         bool strict_prototypes_old = warning.strict_prototypes;
5919         warning.strict_prototypes  = false;
5920         record_declaration(declaration, false);
5921         warning.strict_prototypes = strict_prototypes_old;
5922
5923         return declaration;
5924 }
5925
5926 /**
5927  * Creates a return_type (func)(argument_type) function type if not
5928  * already exists.
5929  */
5930 static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
5931                                     type_t *argument_type2)
5932 {
5933         function_parameter_t *parameter2
5934                 = obstack_alloc(type_obst, sizeof(parameter2[0]));
5935         memset(parameter2, 0, sizeof(parameter2[0]));
5936         parameter2->type = argument_type2;
5937
5938         function_parameter_t *parameter1
5939                 = obstack_alloc(type_obst, sizeof(parameter1[0]));
5940         memset(parameter1, 0, sizeof(parameter1[0]));
5941         parameter1->type = argument_type1;
5942         parameter1->next = parameter2;
5943
5944         type_t *type               = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5945         type->function.return_type = return_type;
5946         type->function.parameters  = parameter1;
5947
5948         type_t *result = typehash_insert(type);
5949         if (result != type) {
5950                 free_type(type);
5951         }
5952
5953         return result;
5954 }
5955
5956 /**
5957  * Creates a return_type (func)(argument_type) function type if not
5958  * already exists.
5959  *
5960  * @param return_type    the return type
5961  * @param argument_type  the argument type
5962  */
5963 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
5964 {
5965         function_parameter_t *parameter
5966                 = obstack_alloc(type_obst, sizeof(parameter[0]));
5967         memset(parameter, 0, sizeof(parameter[0]));
5968         parameter->type = argument_type;
5969
5970         type_t *type               = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5971         type->function.return_type = return_type;
5972         type->function.parameters  = parameter;
5973
5974         type_t *result = typehash_insert(type);
5975         if (result != type) {
5976                 free_type(type);
5977         }
5978
5979         return result;
5980 }
5981
5982 static type_t *make_function_0_type(type_t *return_type)
5983 {
5984         type_t *type               = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
5985         type->function.return_type = return_type;
5986         type->function.parameters  = NULL;
5987
5988         type_t *result = typehash_insert(type);
5989         if (result != type) {
5990                 free_type(type);
5991         }
5992
5993         return result;
5994 }
5995
5996 /**
5997  * Creates a function type for some function like builtins.
5998  *
5999  * @param symbol   the symbol describing the builtin
6000  */
6001 static type_t *get_builtin_symbol_type(symbol_t *symbol)
6002 {
6003         switch(symbol->ID) {
6004         case T___builtin_alloca:
6005                 return make_function_1_type(type_void_ptr, type_size_t);
6006         case T___builtin_huge_val:
6007                 return make_function_0_type(type_double);
6008         case T___builtin_inf:
6009                 return make_function_0_type(type_double);
6010         case T___builtin_inff:
6011                 return make_function_0_type(type_float);
6012         case T___builtin_infl:
6013                 return make_function_0_type(type_long_double);
6014         case T___builtin_nan:
6015                 return make_function_1_type(type_double, type_char_ptr);
6016         case T___builtin_nanf:
6017                 return make_function_1_type(type_float, type_char_ptr);
6018         case T___builtin_nanl:
6019                 return make_function_1_type(type_long_double, type_char_ptr);
6020         case T___builtin_va_end:
6021                 return make_function_1_type(type_void, type_valist);
6022         case T___builtin_expect:
6023                 return make_function_2_type(type_long, type_long, type_long);
6024         default:
6025                 internal_errorf(HERE, "not implemented builtin symbol found");
6026         }
6027 }
6028
6029 /**
6030  * Performs automatic type cast as described in § 6.3.2.1.
6031  *
6032  * @param orig_type  the original type
6033  */
6034 static type_t *automatic_type_conversion(type_t *orig_type)
6035 {
6036         type_t *type = skip_typeref(orig_type);
6037         if (is_type_array(type)) {
6038                 array_type_t *array_type   = &type->array;
6039                 type_t       *element_type = array_type->element_type;
6040                 unsigned      qualifiers   = array_type->base.qualifiers;
6041
6042                 return make_pointer_type(element_type, qualifiers);
6043         }
6044
6045         if (is_type_function(type)) {
6046                 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6047         }
6048
6049         return orig_type;
6050 }
6051
6052 /**
6053  * reverts the automatic casts of array to pointer types and function
6054  * to function-pointer types as defined § 6.3.2.1
6055  */
6056 type_t *revert_automatic_type_conversion(const expression_t *expression)
6057 {
6058         switch (expression->kind) {
6059                 case EXPR_REFERENCE: return expression->reference.declaration->type;
6060
6061                 case EXPR_SELECT:
6062                         return get_qualified_type(expression->select.compound_entry->type,
6063                                                   expression->base.type->base.qualifiers);
6064
6065                 case EXPR_UNARY_DEREFERENCE: {
6066                         const expression_t *const value = expression->unary.value;
6067                         type_t             *const type  = skip_typeref(value->base.type);
6068                         assert(is_type_pointer(type));
6069                         return type->pointer.points_to;
6070                 }
6071
6072                 case EXPR_BUILTIN_SYMBOL:
6073                         return get_builtin_symbol_type(expression->builtin_symbol.symbol);
6074
6075                 case EXPR_ARRAY_ACCESS: {
6076                         const expression_t *array_ref = expression->array_access.array_ref;
6077                         type_t             *type_left = skip_typeref(array_ref->base.type);
6078                         if (!is_type_valid(type_left))
6079                                 return type_left;
6080                         assert(is_type_pointer(type_left));
6081                         return type_left->pointer.points_to;
6082                 }
6083
6084                 case EXPR_STRING_LITERAL: {
6085                         size_t size = expression->string.value.size;
6086                         return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
6087                 }
6088
6089                 case EXPR_WIDE_STRING_LITERAL: {
6090                         size_t size = expression->wide_string.value.size;
6091                         return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
6092                 }
6093
6094                 case EXPR_COMPOUND_LITERAL:
6095                         return expression->compound_literal.type;
6096
6097                 default: break;
6098         }
6099
6100         return expression->base.type;
6101 }
6102
6103 static expression_t *parse_reference(void)
6104 {
6105         expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
6106
6107         reference_expression_t *ref = &expression->reference;
6108         symbol_t *const symbol = token.v.symbol;
6109
6110         declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
6111
6112         if (declaration == NULL) {
6113                 if (!strict_mode && look_ahead(1)->type == '(') {
6114                         /* an implicitly declared function */
6115                         if (warning.implicit_function_declaration) {
6116                                 warningf(HERE, "implicit declaration of function '%Y'",
6117                                         symbol);
6118                         }
6119
6120                         declaration = create_implicit_function(symbol, HERE);
6121                 } else {
6122                         errorf(HERE, "unknown symbol '%Y' found.", symbol);
6123                         declaration = create_error_declaration(symbol, STORAGE_CLASS_NONE);
6124                 }
6125         }
6126
6127         type_t *orig_type = declaration->type;
6128
6129         /* we always do the auto-type conversions; the & and sizeof parser contains
6130          * code to revert this! */
6131         type_t *type = automatic_type_conversion(orig_type);
6132
6133         ref->declaration = declaration;
6134         ref->base.type   = type;
6135
6136         /* this declaration is used */
6137         declaration->used = true;
6138
6139         if (declaration->parent_scope != file_scope                          &&
6140             declaration->parent_scope->depth < current_function->scope.depth &&
6141             is_type_valid(orig_type) && !is_type_function(orig_type)) {
6142                 /* access of a variable from an outer function */
6143                 declaration->address_taken     = true;
6144                 ref->is_outer_ref              = true;
6145                 current_function->need_closure = true;
6146         }
6147
6148         /* check for deprecated functions */
6149         if (warning.deprecated_declarations &&
6150             declaration->modifiers & DM_DEPRECATED) {
6151                 char const *const prefix = is_type_function(declaration->type) ?
6152                         "function" : "variable";
6153
6154                 if (declaration->deprecated_string != NULL) {
6155                         warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"",
6156                                 prefix, declaration->symbol, &declaration->source_position,
6157                                 declaration->deprecated_string);
6158                 } else {
6159                         warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix,
6160                                 declaration->symbol, &declaration->source_position);
6161                 }
6162         }
6163         if (warning.init_self && declaration == current_init_decl && !in_type_prop) {
6164                 current_init_decl = NULL;
6165                 warningf(HERE, "variable '%#T' is initialized by itself",
6166                         declaration->type, declaration->symbol);
6167         }
6168
6169         next_token();
6170         return expression;
6171 }
6172
6173 static bool semantic_cast(expression_t *cast)
6174 {
6175         expression_t            *expression      = cast->unary.value;
6176         type_t                  *orig_dest_type  = cast->base.type;
6177         type_t                  *orig_type_right = expression->base.type;
6178         type_t            const *dst_type        = skip_typeref(orig_dest_type);
6179         type_t            const *src_type        = skip_typeref(orig_type_right);
6180         source_position_t const *pos             = &cast->base.source_position;
6181
6182         /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */
6183         if (dst_type == type_void)
6184                 return true;
6185
6186         /* only integer and pointer can be casted to pointer */
6187         if (is_type_pointer(dst_type)  &&
6188             !is_type_pointer(src_type) &&
6189             !is_type_integer(src_type) &&
6190             is_type_valid(src_type)) {
6191                 errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right);
6192                 return false;
6193         }
6194
6195         if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) {
6196                 errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type);
6197                 return false;
6198         }
6199
6200         if (!is_type_scalar(src_type) && is_type_valid(src_type)) {
6201                 errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right);
6202                 return false;
6203         }
6204
6205         if (warning.cast_qual &&
6206             is_type_pointer(src_type) &&
6207             is_type_pointer(dst_type)) {
6208                 type_t *src = skip_typeref(src_type->pointer.points_to);
6209                 type_t *dst = skip_typeref(dst_type->pointer.points_to);
6210                 unsigned missing_qualifiers =
6211                         src->base.qualifiers & ~dst->base.qualifiers;
6212                 if (missing_qualifiers != 0) {
6213                         warningf(pos,
6214                                  "cast discards qualifiers '%Q' in pointer target type of '%T'",
6215                                  missing_qualifiers, orig_type_right);
6216                 }
6217         }
6218         return true;
6219 }
6220
6221 static expression_t *parse_compound_literal(type_t *type)
6222 {
6223         expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
6224
6225         parse_initializer_env_t env;
6226         env.type             = type;
6227         env.declaration      = NULL;
6228         env.must_be_constant = false;
6229         initializer_t *initializer = parse_initializer(&env);
6230         type = env.type;
6231
6232         expression->compound_literal.initializer = initializer;
6233         expression->compound_literal.type        = type;
6234         expression->base.type                    = automatic_type_conversion(type);
6235
6236         return expression;
6237 }
6238
6239 /**
6240  * Parse a cast expression.
6241  */
6242 static expression_t *parse_cast(void)
6243 {
6244         add_anchor_token(')');
6245
6246         source_position_t source_position = token.source_position;
6247
6248         type_t *type  = parse_typename();
6249
6250         rem_anchor_token(')');
6251         expect(')');
6252
6253         if (token.type == '{') {
6254                 return parse_compound_literal(type);
6255         }
6256
6257         expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
6258         cast->base.source_position = source_position;
6259
6260         expression_t *value = parse_sub_expression(20);
6261         cast->base.type   = type;
6262         cast->unary.value = value;
6263
6264         if (! semantic_cast(cast)) {
6265                 /* TODO: record the error in the AST. else it is impossible to detect it */
6266         }
6267
6268         return cast;
6269 end_error:
6270         return create_invalid_expression();
6271 }
6272
6273 /**
6274  * Parse a statement expression.
6275  */
6276 static expression_t *parse_statement_expression(void)
6277 {
6278         add_anchor_token(')');
6279
6280         expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
6281
6282         statement_t *statement           = parse_compound_statement(true);
6283         expression->statement.statement  = statement;
6284         expression->base.source_position = statement->base.source_position;
6285
6286         /* find last statement and use its type */
6287         type_t *type = type_void;
6288         const statement_t *stmt = statement->compound.statements;
6289         if (stmt != NULL) {
6290                 while (stmt->base.next != NULL)
6291                         stmt = stmt->base.next;
6292
6293                 if (stmt->kind == STATEMENT_EXPRESSION) {
6294                         type = stmt->expression.expression->base.type;
6295                 }
6296         } else {
6297                 warningf(&expression->base.source_position, "empty statement expression ({})");
6298         }
6299         expression->base.type = type;
6300
6301         rem_anchor_token(')');
6302         expect(')');
6303
6304 end_error:
6305         return expression;
6306 }
6307
6308 /**
6309  * Parse a parenthesized expression.
6310  */
6311 static expression_t *parse_parenthesized_expression(void)
6312 {
6313         eat('(');
6314
6315         switch(token.type) {
6316         case '{':
6317                 /* gcc extension: a statement expression */
6318                 return parse_statement_expression();
6319
6320         TYPE_QUALIFIERS
6321         TYPE_SPECIFIERS
6322                 return parse_cast();
6323         case T_IDENTIFIER:
6324                 if (is_typedef_symbol(token.v.symbol)) {
6325                         return parse_cast();
6326                 }
6327         }
6328
6329         add_anchor_token(')');
6330         expression_t *result = parse_expression();
6331         rem_anchor_token(')');
6332         expect(')');
6333
6334 end_error:
6335         return result;
6336 }
6337
6338 static expression_t *parse_function_keyword(void)
6339 {
6340         next_token();
6341         /* TODO */
6342
6343         if (current_function == NULL) {
6344                 errorf(HERE, "'__func__' used outside of a function");
6345         }
6346
6347         expression_t *expression  = allocate_expression_zero(EXPR_FUNCNAME);
6348         expression->base.type     = type_char_ptr;
6349         expression->funcname.kind = FUNCNAME_FUNCTION;
6350
6351         return expression;
6352 }
6353
6354 static expression_t *parse_pretty_function_keyword(void)
6355 {
6356         eat(T___PRETTY_FUNCTION__);
6357
6358         if (current_function == NULL) {
6359                 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
6360         }
6361
6362         expression_t *expression  = allocate_expression_zero(EXPR_FUNCNAME);
6363         expression->base.type     = type_char_ptr;
6364         expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
6365
6366         return expression;
6367 }
6368
6369 static expression_t *parse_funcsig_keyword(void)
6370 {
6371         eat(T___FUNCSIG__);
6372
6373         if (current_function == NULL) {
6374                 errorf(HERE, "'__FUNCSIG__' used outside of a function");
6375         }
6376
6377         expression_t *expression  = allocate_expression_zero(EXPR_FUNCNAME);
6378         expression->base.type     = type_char_ptr;
6379         expression->funcname.kind = FUNCNAME_FUNCSIG;
6380
6381         return expression;
6382 }
6383
6384 static expression_t *parse_funcdname_keyword(void)
6385 {
6386         eat(T___FUNCDNAME__);
6387
6388         if (current_function == NULL) {
6389                 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
6390         }
6391
6392         expression_t *expression  = allocate_expression_zero(EXPR_FUNCNAME);
6393         expression->base.type     = type_char_ptr;
6394         expression->funcname.kind = FUNCNAME_FUNCDNAME;
6395
6396         return expression;
6397 }
6398
6399 static designator_t *parse_designator(void)
6400 {
6401         designator_t *result    = allocate_ast_zero(sizeof(result[0]));
6402         result->source_position = *HERE;
6403
6404         if (token.type != T_IDENTIFIER) {
6405                 parse_error_expected("while parsing member designator",
6406                                      T_IDENTIFIER, NULL);
6407                 return NULL;
6408         }
6409         result->symbol = token.v.symbol;
6410         next_token();
6411
6412         designator_t *last_designator = result;
6413         while(true) {
6414                 if (token.type == '.') {
6415                         next_token();
6416                         if (token.type != T_IDENTIFIER) {
6417                                 parse_error_expected("while parsing member designator",
6418                                                      T_IDENTIFIER, NULL);
6419                                 return NULL;
6420                         }
6421                         designator_t *designator    = allocate_ast_zero(sizeof(result[0]));
6422                         designator->source_position = *HERE;
6423                         designator->symbol          = token.v.symbol;
6424                         next_token();
6425
6426                         last_designator->next = designator;
6427                         last_designator       = designator;
6428                         continue;
6429                 }
6430                 if (token.type == '[') {
6431                         next_token();
6432                         add_anchor_token(']');
6433                         designator_t *designator    = allocate_ast_zero(sizeof(result[0]));
6434                         designator->source_position = *HERE;
6435                         designator->array_index     = parse_expression();
6436                         rem_anchor_token(']');
6437                         expect(']');
6438                         if (designator->array_index == NULL) {
6439                                 return NULL;
6440                         }
6441
6442                         last_designator->next = designator;
6443                         last_designator       = designator;
6444                         continue;
6445                 }
6446                 break;
6447         }
6448
6449         return result;
6450 end_error:
6451         return NULL;
6452 }
6453
6454 /**
6455  * Parse the __builtin_offsetof() expression.
6456  */
6457 static expression_t *parse_offsetof(void)
6458 {
6459         eat(T___builtin_offsetof);
6460
6461         expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
6462         expression->base.type    = type_size_t;
6463
6464         expect('(');
6465         add_anchor_token(',');
6466         type_t *type = parse_typename();
6467         rem_anchor_token(',');
6468         expect(',');
6469         add_anchor_token(')');
6470         designator_t *designator = parse_designator();
6471         rem_anchor_token(')');
6472         expect(')');
6473
6474         expression->offsetofe.type       = type;
6475         expression->offsetofe.designator = designator;
6476
6477         type_path_t path;
6478         memset(&path, 0, sizeof(path));
6479         path.top_type = type;
6480         path.path     = NEW_ARR_F(type_path_entry_t, 0);
6481
6482         descend_into_subtype(&path);
6483
6484         if (!walk_designator(&path, designator, true)) {
6485                 return create_invalid_expression();
6486         }
6487
6488         DEL_ARR_F(path.path);
6489
6490         return expression;
6491 end_error:
6492         return create_invalid_expression();
6493 }
6494
6495 /**
6496  * Parses a _builtin_va_start() expression.
6497  */
6498 static expression_t *parse_va_start(void)
6499 {
6500         eat(T___builtin_va_start);
6501
6502         expression_t *expression = allocate_expression_zero(EXPR_VA_START);
6503
6504         expect('(');
6505         add_anchor_token(',');
6506         expression->va_starte.ap = parse_assignment_expression();
6507         rem_anchor_token(',');
6508         expect(',');
6509         expression_t *const expr = parse_assignment_expression();
6510         if (expr->kind == EXPR_REFERENCE) {
6511                 declaration_t *const decl = expr->reference.declaration;
6512                 if (decl->parent_scope != &current_function->scope || decl->next != NULL) {
6513                         errorf(&expr->base.source_position,
6514                                "second argument of 'va_start' must be last parameter of the current function");
6515                 }
6516                 expression->va_starte.parameter = decl;
6517                 expect(')');
6518                 return expression;
6519         }
6520         expect(')');
6521 end_error:
6522         return create_invalid_expression();
6523 }
6524
6525 /**
6526  * Parses a _builtin_va_arg() expression.
6527  */
6528 static expression_t *parse_va_arg(void)
6529 {
6530         eat(T___builtin_va_arg);
6531
6532         expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
6533
6534         expect('(');
6535         expression->va_arge.ap = parse_assignment_expression();
6536         expect(',');
6537         expression->base.type = parse_typename();
6538         expect(')');
6539
6540         return expression;
6541 end_error:
6542         return create_invalid_expression();
6543 }
6544
6545 static expression_t *parse_builtin_symbol(void)
6546 {
6547         expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
6548
6549         symbol_t *symbol = token.v.symbol;
6550
6551         expression->builtin_symbol.symbol = symbol;
6552         next_token();
6553
6554         type_t *type = get_builtin_symbol_type(symbol);
6555         type = automatic_type_conversion(type);
6556
6557         expression->base.type = type;
6558         return expression;
6559 }
6560
6561 /**
6562  * Parses a __builtin_constant() expression.
6563  */
6564 static expression_t *parse_builtin_constant(void)
6565 {
6566         eat(T___builtin_constant_p);
6567
6568         expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
6569
6570         expect('(');
6571         add_anchor_token(')');
6572         expression->builtin_constant.value = parse_assignment_expression();
6573         rem_anchor_token(')');
6574         expect(')');
6575         expression->base.type = type_int;
6576
6577         return expression;
6578 end_error:
6579         return create_invalid_expression();
6580 }
6581
6582 /**
6583  * Parses a __builtin_prefetch() expression.
6584  */
6585 static expression_t *parse_builtin_prefetch(void)
6586 {
6587         eat(T___builtin_prefetch);
6588
6589         expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
6590
6591         expect('(');
6592         add_anchor_token(')');
6593         expression->builtin_prefetch.adr = parse_assignment_expression();
6594         if (token.type == ',') {
6595                 next_token();
6596                 expression->builtin_prefetch.rw = parse_assignment_expression();
6597         }
6598         if (token.type == ',') {
6599                 next_token();
6600                 expression->builtin_prefetch.locality = parse_assignment_expression();
6601         }
6602         rem_anchor_token(')');
6603         expect(')');
6604         expression->base.type = type_void;
6605
6606         return expression;
6607 end_error:
6608         return create_invalid_expression();
6609 }
6610
6611 /**
6612  * Parses a __builtin_is_*() compare expression.
6613  */
6614 static expression_t *parse_compare_builtin(void)
6615 {
6616         expression_t *expression;
6617
6618         switch(token.type) {
6619         case T___builtin_isgreater:
6620                 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
6621                 break;
6622         case T___builtin_isgreaterequal:
6623                 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
6624                 break;
6625         case T___builtin_isless:
6626                 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
6627                 break;
6628         case T___builtin_islessequal:
6629                 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
6630                 break;
6631         case T___builtin_islessgreater:
6632                 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
6633                 break;
6634         case T___builtin_isunordered:
6635                 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
6636                 break;
6637         default:
6638                 internal_errorf(HERE, "invalid compare builtin found");
6639         }
6640         expression->base.source_position = *HERE;
6641         next_token();
6642
6643         expect('(');
6644         expression->binary.left = parse_assignment_expression();
6645         expect(',');
6646         expression->binary.right = parse_assignment_expression();
6647         expect(')');
6648
6649         type_t *const orig_type_left  = expression->binary.left->base.type;
6650         type_t *const orig_type_right = expression->binary.right->base.type;
6651
6652         type_t *const type_left  = skip_typeref(orig_type_left);
6653         type_t *const type_right = skip_typeref(orig_type_right);
6654         if (!is_type_float(type_left) && !is_type_float(type_right)) {
6655                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6656                         type_error_incompatible("invalid operands in comparison",
6657                                 &expression->base.source_position, orig_type_left, orig_type_right);
6658                 }
6659         } else {
6660                 semantic_comparison(&expression->binary);
6661         }
6662
6663         return expression;
6664 end_error:
6665         return create_invalid_expression();
6666 }
6667
6668 #if 0
6669 /**
6670  * Parses a __builtin_expect() expression.
6671  */
6672 static expression_t *parse_builtin_expect(void)
6673 {
6674         eat(T___builtin_expect);
6675
6676         expression_t *expression
6677                 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
6678
6679         expect('(');
6680         expression->binary.left = parse_assignment_expression();
6681         expect(',');
6682         expression->binary.right = parse_constant_expression();
6683         expect(')');
6684
6685         expression->base.type = expression->binary.left->base.type;
6686
6687         return expression;
6688 end_error:
6689         return create_invalid_expression();
6690 }
6691 #endif
6692
6693 /**
6694  * Parses a MS assume() expression.
6695  */
6696 static expression_t *parse_assume(void)
6697 {
6698         eat(T__assume);
6699
6700         expression_t *expression
6701                 = allocate_expression_zero(EXPR_UNARY_ASSUME);
6702
6703         expect('(');
6704         add_anchor_token(')');
6705         expression->unary.value = parse_assignment_expression();
6706         rem_anchor_token(')');
6707         expect(')');
6708
6709         expression->base.type = type_void;
6710         return expression;
6711 end_error:
6712         return create_invalid_expression();
6713 }
6714
6715 /**
6716  * Return the declaration for a given label symbol or create a new one.
6717  *
6718  * @param symbol  the symbol of the label
6719  */
6720 static declaration_t *get_label(symbol_t *symbol)
6721 {
6722         declaration_t *candidate;
6723         assert(current_function != NULL);
6724
6725         candidate = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
6726         /* if we found a local label, we already created the declaration */
6727         if (candidate != NULL) {
6728                 if (candidate->parent_scope != scope) {
6729                         assert(candidate->parent_scope->depth < scope->depth);
6730                         current_function->goto_to_outer = true;
6731                 }
6732                 return candidate;
6733         }
6734
6735         candidate = get_declaration(symbol, NAMESPACE_LABEL);
6736         /* if we found a label in the same function, then we already created the
6737          * declaration */
6738         if (candidate != NULL
6739                         && candidate->parent_scope == &current_function->scope) {
6740                 return candidate;
6741         }
6742
6743         /* otherwise we need to create a new one */
6744         declaration_t *const declaration = allocate_declaration_zero();
6745         declaration->namespc       = NAMESPACE_LABEL;
6746         declaration->symbol        = symbol;
6747
6748         label_push(declaration);
6749
6750         return declaration;
6751 }
6752
6753 /**
6754  * Parses a GNU && label address expression.
6755  */
6756 static expression_t *parse_label_address(void)
6757 {
6758         source_position_t source_position = token.source_position;
6759         eat(T_ANDAND);
6760         if (token.type != T_IDENTIFIER) {
6761                 parse_error_expected("while parsing label address", T_IDENTIFIER, NULL);
6762                 goto end_error;
6763         }
6764         symbol_t *symbol = token.v.symbol;
6765         next_token();
6766
6767         declaration_t *label = get_label(symbol);
6768
6769         label->used          = true;
6770         label->address_taken = true;
6771
6772         expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS);
6773         expression->base.source_position = source_position;
6774
6775         /* label address is threaten as a void pointer */
6776         expression->base.type                 = type_void_ptr;
6777         expression->label_address.declaration = label;
6778         return expression;
6779 end_error:
6780         return create_invalid_expression();
6781 }
6782
6783 /**
6784  * Parse a microsoft __noop expression.
6785  */
6786 static expression_t *parse_noop_expression(void)
6787 {
6788         source_position_t source_position = *HERE;
6789         eat(T___noop);
6790
6791         if (token.type == '(') {
6792                 /* parse arguments */
6793                 eat('(');
6794                 add_anchor_token(')');
6795                 add_anchor_token(',');
6796
6797                 if (token.type != ')') {
6798                         while(true) {
6799                                 (void)parse_assignment_expression();
6800                                 if (token.type != ',')
6801                                         break;
6802                                 next_token();
6803                         }
6804                 }
6805         }
6806         rem_anchor_token(',');
6807         rem_anchor_token(')');
6808         expect(')');
6809
6810         /* the result is a (int)0 */
6811         expression_t *cnst         = allocate_expression_zero(EXPR_CONST);
6812         cnst->base.source_position = source_position;
6813         cnst->base.type            = type_int;
6814         cnst->conste.v.int_value   = 0;
6815         cnst->conste.is_ms_noop    = true;
6816
6817         return cnst;
6818
6819 end_error:
6820         return create_invalid_expression();
6821 }
6822
6823 /**
6824  * Parses a primary expression.
6825  */
6826 static expression_t *parse_primary_expression(void)
6827 {
6828         switch (token.type) {
6829                 case T_INTEGER:                  return parse_int_const();
6830                 case T_CHARACTER_CONSTANT:       return parse_character_constant();
6831                 case T_WIDE_CHARACTER_CONSTANT:  return parse_wide_character_constant();
6832                 case T_FLOATINGPOINT:            return parse_float_const();
6833                 case T_STRING_LITERAL:
6834                 case T_WIDE_STRING_LITERAL:      return parse_string_const();
6835                 case T_IDENTIFIER:               return parse_reference();
6836                 case T___FUNCTION__:
6837                 case T___func__:                 return parse_function_keyword();
6838                 case T___PRETTY_FUNCTION__:      return parse_pretty_function_keyword();
6839                 case T___FUNCSIG__:              return parse_funcsig_keyword();
6840                 case T___FUNCDNAME__:            return parse_funcdname_keyword();
6841                 case T___builtin_offsetof:       return parse_offsetof();
6842                 case T___builtin_va_start:       return parse_va_start();
6843                 case T___builtin_va_arg:         return parse_va_arg();
6844                 case T___builtin_expect:
6845                 case T___builtin_alloca:
6846                 case T___builtin_inf:
6847                 case T___builtin_inff:
6848                 case T___builtin_infl:
6849                 case T___builtin_nan:
6850                 case T___builtin_nanf:
6851                 case T___builtin_nanl:
6852                 case T___builtin_huge_val:
6853                 case T___builtin_va_end:         return parse_builtin_symbol();
6854                 case T___builtin_isgreater:
6855                 case T___builtin_isgreaterequal:
6856                 case T___builtin_isless:
6857                 case T___builtin_islessequal:
6858                 case T___builtin_islessgreater:
6859                 case T___builtin_isunordered:    return parse_compare_builtin();
6860                 case T___builtin_constant_p:     return parse_builtin_constant();
6861                 case T___builtin_prefetch:       return parse_builtin_prefetch();
6862                 case T__assume:                  return parse_assume();
6863                 case T_ANDAND:
6864                         if (GNU_MODE)
6865                                 return parse_label_address();
6866                         break;
6867
6868                 case '(':                        return parse_parenthesized_expression();
6869                 case T___noop:                   return parse_noop_expression();
6870         }
6871
6872         errorf(HERE, "unexpected token %K, expected an expression", &token);
6873         return create_invalid_expression();
6874 }
6875
6876 /**
6877  * Check if the expression has the character type and issue a warning then.
6878  */
6879 static void check_for_char_index_type(const expression_t *expression)
6880 {
6881         type_t       *const type      = expression->base.type;
6882         const type_t *const base_type = skip_typeref(type);
6883
6884         if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
6885                         warning.char_subscripts) {
6886                 warningf(&expression->base.source_position,
6887                          "array subscript has type '%T'", type);
6888         }
6889 }
6890
6891 static expression_t *parse_array_expression(unsigned precedence,
6892                                             expression_t *left)
6893 {
6894         (void) precedence;
6895
6896         eat('[');
6897         add_anchor_token(']');
6898
6899         expression_t *inside = parse_expression();
6900
6901         expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
6902
6903         array_access_expression_t *array_access = &expression->array_access;
6904
6905         type_t *const orig_type_left   = left->base.type;
6906         type_t *const orig_type_inside = inside->base.type;
6907
6908         type_t *const type_left   = skip_typeref(orig_type_left);
6909         type_t *const type_inside = skip_typeref(orig_type_inside);
6910
6911         type_t *return_type;
6912         if (is_type_pointer(type_left)) {
6913                 return_type             = type_left->pointer.points_to;
6914                 array_access->array_ref = left;
6915                 array_access->index     = inside;
6916                 check_for_char_index_type(inside);
6917         } else if (is_type_pointer(type_inside)) {
6918                 return_type             = type_inside->pointer.points_to;
6919                 array_access->array_ref = inside;
6920                 array_access->index     = left;
6921                 array_access->flipped   = true;
6922                 check_for_char_index_type(left);
6923         } else {
6924                 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
6925                         errorf(HERE,
6926                                 "array access on object with non-pointer types '%T', '%T'",
6927                                 orig_type_left, orig_type_inside);
6928                 }
6929                 return_type             = type_error_type;
6930                 array_access->array_ref = left;
6931                 array_access->index     = inside;
6932         }
6933
6934         expression->base.type = automatic_type_conversion(return_type);
6935
6936         rem_anchor_token(']');
6937         if (token.type == ']') {
6938                 next_token();
6939         } else {
6940                 parse_error_expected("Problem while parsing array access", ']', NULL);
6941         }
6942         return expression;
6943 }
6944
6945 static expression_t *parse_typeprop(expression_kind_t const kind,
6946                                     source_position_t const pos,
6947                                     unsigned const precedence)
6948 {
6949         expression_t  *tp_expression = allocate_expression_zero(kind);
6950         tp_expression->base.type            = type_size_t;
6951         tp_expression->base.source_position = pos;
6952
6953         char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof";
6954
6955         /* we only refer to a type property, mark this case */
6956         bool old     = in_type_prop;
6957         in_type_prop = true;
6958         if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
6959                 next_token();
6960                 add_anchor_token(')');
6961                 type_t* const orig_type = parse_typename();
6962                 tp_expression->typeprop.type = orig_type;
6963
6964                 type_t const* const type = skip_typeref(orig_type);
6965                 char const* const wrong_type =
6966                         is_type_incomplete(type)    ? "incomplete"          :
6967                         type->kind == TYPE_FUNCTION ? "function designator" :
6968                         type->kind == TYPE_BITFIELD ? "bitfield"            :
6969                         NULL;
6970                 if (wrong_type != NULL) {
6971                         errorf(&pos, "operand of %s expression must not be %s type '%T'",
6972                                what, wrong_type, type);
6973                 }
6974
6975                 rem_anchor_token(')');
6976                 expect(')');
6977         } else {
6978                 expression_t *expression = parse_sub_expression(precedence);
6979
6980                 type_t* const orig_type = revert_automatic_type_conversion(expression);
6981                 expression->base.type = orig_type;
6982
6983                 type_t const* const type = skip_typeref(orig_type);
6984                 char const* const wrong_type =
6985                         is_type_incomplete(type)    ? "incomplete"          :
6986                         type->kind == TYPE_FUNCTION ? "function designator" :
6987                         type->kind == TYPE_BITFIELD ? "bitfield"            :
6988                         NULL;
6989                 if (wrong_type != NULL) {
6990                         errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type);
6991                 }
6992
6993                 tp_expression->typeprop.type          = expression->base.type;
6994                 tp_expression->typeprop.tp_expression = expression;
6995         }
6996
6997 end_error:
6998         in_type_prop = old;
6999         return tp_expression;
7000 }
7001
7002 static expression_t *parse_sizeof(unsigned precedence)
7003 {
7004         source_position_t pos = *HERE;
7005         eat(T_sizeof);
7006         return parse_typeprop(EXPR_SIZEOF, pos, precedence);
7007 }
7008
7009 static expression_t *parse_alignof(unsigned precedence)
7010 {
7011         source_position_t pos = *HERE;
7012         eat(T___alignof__);
7013         return parse_typeprop(EXPR_ALIGNOF, pos, precedence);
7014 }
7015
7016 static expression_t *parse_select_expression(unsigned precedence,
7017                                              expression_t *compound)
7018 {
7019         (void) precedence;
7020         assert(token.type == '.' || token.type == T_MINUSGREATER);
7021
7022         bool is_pointer = (token.type == T_MINUSGREATER);
7023         next_token();
7024
7025         expression_t *select    = allocate_expression_zero(EXPR_SELECT);
7026         select->select.compound = compound;
7027
7028         if (token.type != T_IDENTIFIER) {
7029                 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
7030                 return select;
7031         }
7032         symbol_t *symbol = token.v.symbol;
7033         next_token();
7034
7035         type_t *const orig_type = compound->base.type;
7036         type_t *const type      = skip_typeref(orig_type);
7037
7038         type_t *type_left;
7039         bool    saw_error = false;
7040         if (is_type_pointer(type)) {
7041                 if (!is_pointer) {
7042                         errorf(HERE,
7043                                "request for member '%Y' in something not a struct or union, but '%T'",
7044                                symbol, orig_type);
7045                         saw_error = true;
7046                 }
7047                 type_left = skip_typeref(type->pointer.points_to);
7048         } else {
7049                 if (is_pointer && is_type_valid(type)) {
7050                         errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
7051                         saw_error = true;
7052                 }
7053                 type_left = type;
7054         }
7055
7056         declaration_t *entry;
7057         if (type_left->kind == TYPE_COMPOUND_STRUCT ||
7058             type_left->kind == TYPE_COMPOUND_UNION) {
7059                 declaration_t *const declaration = type_left->compound.declaration;
7060
7061                 if (!declaration->init.complete) {
7062                         errorf(HERE, "request for member '%Y' of incomplete type '%T'",
7063                                symbol, type_left);
7064                         goto create_error_entry;
7065                 }
7066
7067                 entry = find_compound_entry(declaration, symbol);
7068                 if (entry == NULL) {
7069                         errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
7070                         goto create_error_entry;
7071                 }
7072         } else {
7073                 if (is_type_valid(type_left) && !saw_error) {
7074                         errorf(HERE,
7075                                "request for member '%Y' in something not a struct or union, but '%T'",
7076                                symbol, type_left);
7077                 }
7078 create_error_entry:
7079                 entry         = allocate_declaration_zero();
7080                 entry->symbol = symbol;
7081         }
7082
7083         select->select.compound_entry = entry;
7084
7085         type_t *const res_type =
7086                 get_qualified_type(entry->type, type_left->base.qualifiers);
7087
7088         /* we always do the auto-type conversions; the & and sizeof parser contains
7089          * code to revert this! */
7090         select->base.type = automatic_type_conversion(res_type);
7091
7092         type_t *skipped = skip_typeref(res_type);
7093         if (skipped->kind == TYPE_BITFIELD) {
7094                 select->base.type = skipped->bitfield.base_type;
7095         }
7096
7097         return select;
7098 }
7099
7100 static void check_call_argument(const function_parameter_t *parameter,
7101                                 call_argument_t *argument, unsigned pos)
7102 {
7103         type_t         *expected_type      = parameter->type;
7104         type_t         *expected_type_skip = skip_typeref(expected_type);
7105         assign_error_t  error              = ASSIGN_ERROR_INCOMPATIBLE;
7106         expression_t   *arg_expr           = argument->expression;
7107         type_t         *arg_type           = skip_typeref(arg_expr->base.type);
7108
7109         /* handle transparent union gnu extension */
7110         if (is_type_union(expected_type_skip)
7111                         && (expected_type_skip->base.modifiers
7112                                 & TYPE_MODIFIER_TRANSPARENT_UNION)) {
7113                 declaration_t  *union_decl = expected_type_skip->compound.declaration;
7114
7115                 declaration_t *declaration = union_decl->scope.declarations;
7116                 type_t        *best_type   = NULL;
7117                 for ( ; declaration != NULL; declaration = declaration->next) {
7118                         type_t *decl_type = declaration->type;
7119                         error = semantic_assign(decl_type, arg_expr);
7120                         if (error == ASSIGN_ERROR_INCOMPATIBLE
7121                                 || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING)
7122                                 continue;
7123
7124                         if (error == ASSIGN_SUCCESS) {
7125                                 best_type = decl_type;
7126                         } else if (best_type == NULL) {
7127                                 best_type = decl_type;
7128                         }
7129                 }
7130
7131                 if (best_type != NULL) {
7132                         expected_type = best_type;
7133                 }
7134         }
7135
7136         error                = semantic_assign(expected_type, arg_expr);
7137         argument->expression = create_implicit_cast(argument->expression,
7138                                                     expected_type);
7139
7140         if (error != ASSIGN_SUCCESS) {
7141                 /* report exact scope in error messages (like "in argument 3") */
7142                 char buf[64];
7143                 snprintf(buf, sizeof(buf), "call argument %u", pos);
7144                 report_assign_error(error, expected_type, arg_expr,     buf,
7145                                                         &arg_expr->base.source_position);
7146         } else if (warning.traditional || warning.conversion) {
7147                 type_t *const promoted_type = get_default_promoted_type(arg_type);
7148                 if (!types_compatible(expected_type_skip, promoted_type) &&
7149                     !types_compatible(expected_type_skip, type_void_ptr) &&
7150                     !types_compatible(type_void_ptr,      promoted_type)) {
7151                         /* Deliberately show the skipped types in this warning */
7152                         warningf(&arg_expr->base.source_position,
7153                                 "passing call argument %u as '%T' rather than '%T' due to prototype",
7154                                 pos, expected_type_skip, promoted_type);
7155                 }
7156         }
7157 }
7158
7159 /**
7160  * Parse a call expression, ie. expression '( ... )'.
7161  *
7162  * @param expression  the function address
7163  */
7164 static expression_t *parse_call_expression(unsigned precedence,
7165                                            expression_t *expression)
7166 {
7167         (void) precedence;
7168         expression_t *result = allocate_expression_zero(EXPR_CALL);
7169         result->base.source_position = expression->base.source_position;
7170
7171         call_expression_t *call = &result->call;
7172         call->function          = expression;
7173
7174         type_t *const orig_type = expression->base.type;
7175         type_t *const type      = skip_typeref(orig_type);
7176
7177         function_type_t *function_type = NULL;
7178         if (is_type_pointer(type)) {
7179                 type_t *const to_type = skip_typeref(type->pointer.points_to);
7180
7181                 if (is_type_function(to_type)) {
7182                         function_type   = &to_type->function;
7183                         call->base.type = function_type->return_type;
7184                 }
7185         }
7186
7187         if (function_type == NULL && is_type_valid(type)) {
7188                 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
7189         }
7190
7191         /* parse arguments */
7192         eat('(');
7193         add_anchor_token(')');
7194         add_anchor_token(',');
7195
7196         if (token.type != ')') {
7197                 call_argument_t *last_argument = NULL;
7198
7199                 while (true) {
7200                         call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
7201
7202                         argument->expression = parse_assignment_expression();
7203                         if (last_argument == NULL) {
7204                                 call->arguments = argument;
7205                         } else {
7206                                 last_argument->next = argument;
7207                         }
7208                         last_argument = argument;
7209
7210                         if (token.type != ',')
7211                                 break;
7212                         next_token();
7213                 }
7214         }
7215         rem_anchor_token(',');
7216         rem_anchor_token(')');
7217         expect(')');
7218
7219         if (function_type == NULL)
7220                 return result;
7221
7222         function_parameter_t *parameter = function_type->parameters;
7223         call_argument_t      *argument  = call->arguments;
7224         if (!function_type->unspecified_parameters) {
7225                 for (unsigned pos = 0; parameter != NULL && argument != NULL;
7226                                 parameter = parameter->next, argument = argument->next) {
7227                         check_call_argument(parameter, argument, ++pos);
7228                 }
7229
7230                 if (parameter != NULL) {
7231                         errorf(HERE, "too few arguments to function '%E'", expression);
7232                 } else if (argument != NULL && !function_type->variadic) {
7233                         errorf(HERE, "too many arguments to function '%E'", expression);
7234                 }
7235         }
7236
7237         /* do default promotion */
7238         for( ; argument != NULL; argument = argument->next) {
7239                 type_t *type = argument->expression->base.type;
7240
7241                 type = get_default_promoted_type(type);
7242
7243                 argument->expression
7244                         = create_implicit_cast(argument->expression, type);
7245         }
7246
7247         check_format(&result->call);
7248
7249         if (warning.aggregate_return &&
7250             is_type_compound(skip_typeref(function_type->return_type))) {
7251                 warningf(&result->base.source_position,
7252                          "function call has aggregate value");
7253         }
7254
7255 end_error:
7256         return result;
7257 }
7258
7259 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
7260
7261 static bool same_compound_type(const type_t *type1, const type_t *type2)
7262 {
7263         return
7264                 is_type_compound(type1) &&
7265                 type1->kind == type2->kind &&
7266                 type1->compound.declaration == type2->compound.declaration;
7267 }
7268
7269 /**
7270  * Parse a conditional expression, ie. 'expression ? ... : ...'.
7271  *
7272  * @param expression  the conditional expression
7273  */
7274 static expression_t *parse_conditional_expression(unsigned precedence,
7275                                                   expression_t *expression)
7276 {
7277         expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
7278
7279         conditional_expression_t *conditional = &result->conditional;
7280         conditional->base.source_position = *HERE;
7281         conditional->condition            = expression;
7282
7283         eat('?');
7284         add_anchor_token(':');
7285
7286         /* 6.5.15.2 */
7287         type_t *const condition_type_orig = expression->base.type;
7288         type_t *const condition_type      = skip_typeref(condition_type_orig);
7289         if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
7290                 type_error("expected a scalar type in conditional condition",
7291                            &expression->base.source_position, condition_type_orig);
7292         }
7293
7294         expression_t *true_expression = expression;
7295         bool          gnu_cond = false;
7296         if (GNU_MODE && token.type == ':') {
7297                 gnu_cond = true;
7298         } else
7299                 true_expression = parse_expression();
7300         rem_anchor_token(':');
7301         expect(':');
7302         expression_t *false_expression = parse_sub_expression(precedence);
7303
7304         type_t *const orig_true_type  = true_expression->base.type;
7305         type_t *const orig_false_type = false_expression->base.type;
7306         type_t *const true_type       = skip_typeref(orig_true_type);
7307         type_t *const false_type      = skip_typeref(orig_false_type);
7308
7309         /* 6.5.15.3 */
7310         type_t *result_type;
7311         if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
7312                 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7313                 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
7314                     || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
7315                         warningf(&conditional->base.source_position,
7316                                         "ISO C forbids conditional expression with only one void side");
7317                 }
7318                 result_type = type_void;
7319         } else if (is_type_arithmetic(true_type)
7320                    && is_type_arithmetic(false_type)) {
7321                 result_type = semantic_arithmetic(true_type, false_type);
7322
7323                 true_expression  = create_implicit_cast(true_expression, result_type);
7324                 false_expression = create_implicit_cast(false_expression, result_type);
7325
7326                 conditional->true_expression  = true_expression;
7327                 conditional->false_expression = false_expression;
7328                 conditional->base.type        = result_type;
7329         } else if (same_compound_type(true_type, false_type)) {
7330                 /* just take 1 of the 2 types */
7331                 result_type = true_type;
7332         } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
7333                 type_t *pointer_type;
7334                 type_t *other_type;
7335                 expression_t *other_expression;
7336                 if (is_type_pointer(true_type) &&
7337                                 (!is_type_pointer(false_type) || is_null_pointer_constant(false_expression))) {
7338                         pointer_type     = true_type;
7339                         other_type       = false_type;
7340                         other_expression = false_expression;
7341                 } else {
7342                         pointer_type     = false_type;
7343                         other_type       = true_type;
7344                         other_expression = true_expression;
7345                 }
7346
7347                 if (is_null_pointer_constant(other_expression)) {
7348                         result_type = pointer_type;
7349                 } else if (is_type_pointer(other_type)) {
7350                         type_t *to1 = skip_typeref(pointer_type->pointer.points_to);
7351                         type_t *to2 = skip_typeref(other_type->pointer.points_to);
7352
7353                         type_t *to;
7354                         if (is_type_atomic(to1, ATOMIC_TYPE_VOID) ||
7355                             is_type_atomic(to2, ATOMIC_TYPE_VOID)) {
7356                                 to = type_void;
7357                         } else if (types_compatible(get_unqualified_type(to1),
7358                                                     get_unqualified_type(to2))) {
7359                                 to = to1;
7360                         } else {
7361                                 warningf(&conditional->base.source_position,
7362                                         "pointer types '%T' and '%T' in conditional expression are incompatible",
7363                                         true_type, false_type);
7364                                 to = type_void;
7365                         }
7366
7367                         type_t *const type =
7368                                 get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers);
7369                         result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE);
7370                 } else if (is_type_integer(other_type)) {
7371                         warningf(&conditional->base.source_position,
7372                                         "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
7373                         result_type = pointer_type;
7374                 } else {
7375                         type_error_incompatible("while parsing conditional",
7376                                         &expression->base.source_position, true_type, false_type);
7377                         result_type = type_error_type;
7378                 }
7379         } else {
7380                 /* TODO: one pointer to void*, other some pointer */
7381
7382                 if (is_type_valid(true_type) && is_type_valid(false_type)) {
7383                         type_error_incompatible("while parsing conditional",
7384                                                 &conditional->base.source_position, true_type,
7385                                                 false_type);
7386                 }
7387                 result_type = type_error_type;
7388         }
7389
7390         conditional->true_expression
7391                 = gnu_cond ? NULL : create_implicit_cast(true_expression, result_type);
7392         conditional->false_expression
7393                 = create_implicit_cast(false_expression, result_type);
7394         conditional->base.type = result_type;
7395         return result;
7396 end_error:
7397         return create_invalid_expression();
7398 }
7399
7400 /**
7401  * Parse an extension expression.
7402  */
7403 static expression_t *parse_extension(unsigned precedence)
7404 {
7405         eat(T___extension__);
7406
7407         bool old_gcc_extension   = in_gcc_extension;
7408         in_gcc_extension         = true;
7409         expression_t *expression = parse_sub_expression(precedence);
7410         in_gcc_extension         = old_gcc_extension;
7411         return expression;
7412 }
7413
7414 /**
7415  * Parse a __builtin_classify_type() expression.
7416  */
7417 static expression_t *parse_builtin_classify_type(const unsigned precedence)
7418 {
7419         eat(T___builtin_classify_type);
7420
7421         expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
7422         result->base.type    = type_int;
7423
7424         expect('(');
7425         add_anchor_token(')');
7426         expression_t *expression = parse_sub_expression(precedence);
7427         rem_anchor_token(')');
7428         expect(')');
7429         result->classify_type.type_expression = expression;
7430
7431         return result;
7432 end_error:
7433         return create_invalid_expression();
7434 }
7435
7436 static bool check_pointer_arithmetic(const source_position_t *source_position,
7437                                      type_t *pointer_type,
7438                                      type_t *orig_pointer_type)
7439 {
7440         type_t *points_to = pointer_type->pointer.points_to;
7441         points_to = skip_typeref(points_to);
7442
7443         if (is_type_incomplete(points_to)) {
7444                 if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) {
7445                         errorf(source_position,
7446                                "arithmetic with pointer to incomplete type '%T' not allowed",
7447                                orig_pointer_type);
7448                         return false;
7449                 } else if (warning.pointer_arith) {
7450                         warningf(source_position,
7451                                  "pointer of type '%T' used in arithmetic",
7452                                  orig_pointer_type);
7453                 }
7454         } else if (is_type_function(points_to)) {
7455                 if (!GNU_MODE) {
7456                         errorf(source_position,
7457                                "arithmetic with pointer to function type '%T' not allowed",
7458                                orig_pointer_type);
7459                         return false;
7460                 } else if (warning.pointer_arith) {
7461                         warningf(source_position,
7462                                  "pointer to a function '%T' used in arithmetic",
7463                                  orig_pointer_type);
7464                 }
7465         }
7466         return true;
7467 }
7468
7469 static bool is_lvalue(const expression_t *expression)
7470 {
7471         switch (expression->kind) {
7472         case EXPR_REFERENCE:
7473         case EXPR_ARRAY_ACCESS:
7474         case EXPR_SELECT:
7475         case EXPR_UNARY_DEREFERENCE:
7476                 return true;
7477
7478         default:
7479                 /* Claim it is an lvalue, if the type is invalid.  There was a parse
7480                  * error before, which maybe prevented properly recognizing it as
7481                  * lvalue. */
7482                 return !is_type_valid(skip_typeref(expression->base.type));
7483         }
7484 }
7485
7486 static void semantic_incdec(unary_expression_t *expression)
7487 {
7488         type_t *const orig_type = expression->value->base.type;
7489         type_t *const type      = skip_typeref(orig_type);
7490         if (is_type_pointer(type)) {
7491                 if (!check_pointer_arithmetic(&expression->base.source_position,
7492                                               type, orig_type)) {
7493                         return;
7494                 }
7495         } else if (!is_type_real(type) && is_type_valid(type)) {
7496                 /* TODO: improve error message */
7497                 errorf(&expression->base.source_position,
7498                        "operation needs an arithmetic or pointer type");
7499                 return;
7500         }
7501         if (!is_lvalue(expression->value)) {
7502                 /* TODO: improve error message */
7503                 errorf(&expression->base.source_position, "lvalue required as operand");
7504         }
7505         expression->base.type = orig_type;
7506 }
7507
7508 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
7509 {
7510         type_t *const orig_type = expression->value->base.type;
7511         type_t *const type      = skip_typeref(orig_type);
7512         if (!is_type_arithmetic(type)) {
7513                 if (is_type_valid(type)) {
7514                         /* TODO: improve error message */
7515                         errorf(&expression->base.source_position,
7516                                 "operation needs an arithmetic type");
7517                 }
7518                 return;
7519         }
7520
7521         expression->base.type = orig_type;
7522 }
7523
7524 static void semantic_unexpr_plus(unary_expression_t *expression)
7525 {
7526         semantic_unexpr_arithmetic(expression);
7527         if (warning.traditional)
7528                 warningf(&expression->base.source_position,
7529                         "traditional C rejects the unary plus operator");
7530 }
7531
7532 static expression_t const *get_reference_address(expression_t const *expr)
7533 {
7534         bool regular_take_address = true;
7535         for (;;) {
7536                 if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
7537                         expr = expr->unary.value;
7538                 } else {
7539                         regular_take_address = false;
7540                 }
7541
7542                 if (expr->kind != EXPR_UNARY_DEREFERENCE)
7543                         break;
7544
7545                 expr = expr->unary.value;
7546         }
7547
7548         if (expr->kind != EXPR_REFERENCE)
7549                 return NULL;
7550
7551         if (!regular_take_address &&
7552             !is_type_function(skip_typeref(expr->reference.declaration->type))) {
7553                 return NULL;
7554         }
7555
7556         return expr;
7557 }
7558
7559 static void warn_function_address_as_bool(expression_t const* expr)
7560 {
7561         if (!warning.address)
7562                 return;
7563
7564         expr = get_reference_address(expr);
7565         if (expr != NULL) {
7566                 warningf(&expr->base.source_position,
7567                         "the address of '%Y' will always evaluate as 'true'",
7568                         expr->reference.declaration->symbol);
7569         }
7570 }
7571
7572 static void semantic_not(unary_expression_t *expression)
7573 {
7574         type_t *const orig_type = expression->value->base.type;
7575         type_t *const type      = skip_typeref(orig_type);
7576         if (!is_type_scalar(type) && is_type_valid(type)) {
7577                 errorf(&expression->base.source_position,
7578                        "operand of ! must be of scalar type");
7579         }
7580
7581         warn_function_address_as_bool(expression->value);
7582
7583         expression->base.type = type_int;
7584 }
7585
7586 static void semantic_unexpr_integer(unary_expression_t *expression)
7587 {
7588         type_t *const orig_type = expression->value->base.type;
7589         type_t *const type      = skip_typeref(orig_type);
7590         if (!is_type_integer(type)) {
7591                 if (is_type_valid(type)) {
7592                         errorf(&expression->base.source_position,
7593                                "operand of ~ must be of integer type");
7594                 }
7595                 return;
7596         }
7597
7598         expression->base.type = orig_type;
7599 }
7600
7601 static void semantic_dereference(unary_expression_t *expression)
7602 {
7603         type_t *const orig_type = expression->value->base.type;
7604         type_t *const type      = skip_typeref(orig_type);
7605         if (!is_type_pointer(type)) {
7606                 if (is_type_valid(type)) {
7607                         errorf(&expression->base.source_position,
7608                                "Unary '*' needs pointer or array type, but type '%T' given", orig_type);
7609                 }
7610                 return;
7611         }
7612
7613         type_t *result_type   = type->pointer.points_to;
7614         result_type           = automatic_type_conversion(result_type);
7615         expression->base.type = result_type;
7616 }
7617
7618 /**
7619  * Record that an address is taken (expression represents an lvalue).
7620  *
7621  * @param expression       the expression
7622  * @param may_be_register  if true, the expression might be an register
7623  */
7624 static void set_address_taken(expression_t *expression, bool may_be_register)
7625 {
7626         if (expression->kind != EXPR_REFERENCE)
7627                 return;
7628
7629         declaration_t *const declaration = expression->reference.declaration;
7630         /* happens for parse errors */
7631         if (declaration == NULL)
7632                 return;
7633
7634         if (declaration->storage_class == STORAGE_CLASS_REGISTER && !may_be_register) {
7635                 errorf(&expression->base.source_position,
7636                                 "address of register variable '%Y' requested",
7637                                 declaration->symbol);
7638         } else {
7639                 declaration->address_taken = 1;
7640         }
7641 }
7642
7643 /**
7644  * Check the semantic of the address taken expression.
7645  */
7646 static void semantic_take_addr(unary_expression_t *expression)
7647 {
7648         expression_t *value = expression->value;
7649         value->base.type    = revert_automatic_type_conversion(value);
7650
7651         type_t *orig_type = value->base.type;
7652         if (!is_type_valid(orig_type))
7653                 return;
7654
7655         set_address_taken(value, false);
7656
7657         expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
7658 }
7659
7660 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc)   \
7661 static expression_t *parse_##unexpression_type(unsigned precedence)            \
7662 {                                                                              \
7663         expression_t *unary_expression                                             \
7664                 = allocate_expression_zero(unexpression_type);                         \
7665         unary_expression->base.source_position = *HERE;                            \
7666         eat(token_type);                                                           \
7667         unary_expression->unary.value = parse_sub_expression(precedence);          \
7668                                                                                    \
7669         sfunc(&unary_expression->unary);                                           \
7670                                                                                    \
7671         return unary_expression;                                                   \
7672 }
7673
7674 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
7675                                semantic_unexpr_arithmetic)
7676 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
7677                                semantic_unexpr_plus)
7678 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
7679                                semantic_not)
7680 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
7681                                semantic_dereference)
7682 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
7683                                semantic_take_addr)
7684 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
7685                                semantic_unexpr_integer)
7686 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS,   EXPR_UNARY_PREFIX_INCREMENT,
7687                                semantic_incdec)
7688 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
7689                                semantic_incdec)
7690
7691 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
7692                                                sfunc)                         \
7693 static expression_t *parse_##unexpression_type(unsigned precedence,           \
7694                                                expression_t *left)            \
7695 {                                                                             \
7696         (void) precedence;                                                        \
7697                                                                               \
7698         expression_t *unary_expression                                            \
7699                 = allocate_expression_zero(unexpression_type);                        \
7700         unary_expression->base.source_position = *HERE;                           \
7701         eat(token_type);                                                          \
7702         unary_expression->unary.value          = left;                            \
7703                                                                                   \
7704         sfunc(&unary_expression->unary);                                          \
7705                                                                               \
7706         return unary_expression;                                                  \
7707 }
7708
7709 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
7710                                        EXPR_UNARY_POSTFIX_INCREMENT,
7711                                        semantic_incdec)
7712 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
7713                                        EXPR_UNARY_POSTFIX_DECREMENT,
7714                                        semantic_incdec)
7715
7716 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
7717 {
7718         /* TODO: handle complex + imaginary types */
7719
7720         type_left  = get_unqualified_type(type_left);
7721         type_right = get_unqualified_type(type_right);
7722
7723         /* § 6.3.1.8 Usual arithmetic conversions */
7724         if (type_left == type_long_double || type_right == type_long_double) {
7725                 return type_long_double;
7726         } else if (type_left == type_double || type_right == type_double) {
7727                 return type_double;
7728         } else if (type_left == type_float || type_right == type_float) {
7729                 return type_float;
7730         }
7731
7732         type_left  = promote_integer(type_left);
7733         type_right = promote_integer(type_right);
7734
7735         if (type_left == type_right)
7736                 return type_left;
7737
7738         bool const signed_left  = is_type_signed(type_left);
7739         bool const signed_right = is_type_signed(type_right);
7740         int const  rank_left    = get_rank(type_left);
7741         int const  rank_right   = get_rank(type_right);
7742
7743         if (signed_left == signed_right)
7744                 return rank_left >= rank_right ? type_left : type_right;
7745
7746         int     s_rank;
7747         int     u_rank;
7748         type_t *s_type;
7749         type_t *u_type;
7750         if (signed_left) {
7751                 s_rank = rank_left;
7752                 s_type = type_left;
7753                 u_rank = rank_right;
7754                 u_type = type_right;
7755         } else {
7756                 s_rank = rank_right;
7757                 s_type = type_right;
7758                 u_rank = rank_left;
7759                 u_type = type_left;
7760         }
7761
7762         if (u_rank >= s_rank)
7763                 return u_type;
7764
7765         /* casting rank to atomic_type_kind is a bit hacky, but makes things
7766          * easier here... */
7767         if (get_atomic_type_size((atomic_type_kind_t) s_rank)
7768                         > get_atomic_type_size((atomic_type_kind_t) u_rank))
7769                 return s_type;
7770
7771         switch (s_rank) {
7772                 case ATOMIC_TYPE_INT:      return type_unsigned_int;
7773                 case ATOMIC_TYPE_LONG:     return type_unsigned_long;
7774                 case ATOMIC_TYPE_LONGLONG: return type_unsigned_long_long;
7775
7776                 default: panic("invalid atomic type");
7777         }
7778 }
7779
7780 /**
7781  * Check the semantic restrictions for a binary expression.
7782  */
7783 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
7784 {
7785         expression_t *const left            = expression->left;
7786         expression_t *const right           = expression->right;
7787         type_t       *const orig_type_left  = left->base.type;
7788         type_t       *const orig_type_right = right->base.type;
7789         type_t       *const type_left       = skip_typeref(orig_type_left);
7790         type_t       *const type_right      = skip_typeref(orig_type_right);
7791
7792         if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
7793                 /* TODO: improve error message */
7794                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7795                         errorf(&expression->base.source_position,
7796                                "operation needs arithmetic types");
7797                 }
7798                 return;
7799         }
7800
7801         type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7802         expression->left      = create_implicit_cast(left, arithmetic_type);
7803         expression->right     = create_implicit_cast(right, arithmetic_type);
7804         expression->base.type = arithmetic_type;
7805 }
7806
7807 static void warn_div_by_zero(binary_expression_t const *const expression)
7808 {
7809         if (!warning.div_by_zero ||
7810             !is_type_integer(expression->base.type))
7811                 return;
7812
7813         expression_t const *const right = expression->right;
7814         /* The type of the right operand can be different for /= */
7815         if (is_type_integer(right->base.type) &&
7816             is_constant_expression(right)     &&
7817             fold_constant(right) == 0) {
7818                 warningf(&expression->base.source_position, "division by zero");
7819         }
7820 }
7821
7822 /**
7823  * Check the semantic restrictions for a div/mod expression.
7824  */
7825 static void semantic_divmod_arithmetic(binary_expression_t *expression) {
7826         semantic_binexpr_arithmetic(expression);
7827         warn_div_by_zero(expression);
7828 }
7829
7830 static void semantic_shift_op(binary_expression_t *expression)
7831 {
7832         expression_t *const left            = expression->left;
7833         expression_t *const right           = expression->right;
7834         type_t       *const orig_type_left  = left->base.type;
7835         type_t       *const orig_type_right = right->base.type;
7836         type_t       *      type_left       = skip_typeref(orig_type_left);
7837         type_t       *      type_right      = skip_typeref(orig_type_right);
7838
7839         if (!is_type_integer(type_left) || !is_type_integer(type_right)) {
7840                 /* TODO: improve error message */
7841                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
7842                         errorf(&expression->base.source_position,
7843                                "operands of shift operation must have integer types");
7844                 }
7845                 return;
7846         }
7847
7848         type_left  = promote_integer(type_left);
7849         type_right = promote_integer(type_right);
7850
7851         expression->left      = create_implicit_cast(left, type_left);
7852         expression->right     = create_implicit_cast(right, type_right);
7853         expression->base.type = type_left;
7854 }
7855
7856 static void semantic_add(binary_expression_t *expression)
7857 {
7858         expression_t *const left            = expression->left;
7859         expression_t *const right           = expression->right;
7860         type_t       *const orig_type_left  = left->base.type;
7861         type_t       *const orig_type_right = right->base.type;
7862         type_t       *const type_left       = skip_typeref(orig_type_left);
7863         type_t       *const type_right      = skip_typeref(orig_type_right);
7864
7865         /* § 6.5.6 */
7866         if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7867                 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7868                 expression->left  = create_implicit_cast(left, arithmetic_type);
7869                 expression->right = create_implicit_cast(right, arithmetic_type);
7870                 expression->base.type = arithmetic_type;
7871                 return;
7872         } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7873                 check_pointer_arithmetic(&expression->base.source_position,
7874                                          type_left, orig_type_left);
7875                 expression->base.type = type_left;
7876         } else if (is_type_pointer(type_right) && is_type_integer(type_left)) {
7877                 check_pointer_arithmetic(&expression->base.source_position,
7878                                          type_right, orig_type_right);
7879                 expression->base.type = type_right;
7880         } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7881                 errorf(&expression->base.source_position,
7882                        "invalid operands to binary + ('%T', '%T')",
7883                        orig_type_left, orig_type_right);
7884         }
7885 }
7886
7887 static void semantic_sub(binary_expression_t *expression)
7888 {
7889         expression_t            *const left            = expression->left;
7890         expression_t            *const right           = expression->right;
7891         type_t                  *const orig_type_left  = left->base.type;
7892         type_t                  *const orig_type_right = right->base.type;
7893         type_t                  *const type_left       = skip_typeref(orig_type_left);
7894         type_t                  *const type_right      = skip_typeref(orig_type_right);
7895         source_position_t const *const pos             = &expression->base.source_position;
7896
7897         /* § 5.6.5 */
7898         if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7899                 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
7900                 expression->left        = create_implicit_cast(left, arithmetic_type);
7901                 expression->right       = create_implicit_cast(right, arithmetic_type);
7902                 expression->base.type =  arithmetic_type;
7903                 return;
7904         } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
7905                 check_pointer_arithmetic(&expression->base.source_position,
7906                                          type_left, orig_type_left);
7907                 expression->base.type = type_left;
7908         } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
7909                 type_t *const unqual_left  = get_unqualified_type(skip_typeref(type_left->pointer.points_to));
7910                 type_t *const unqual_right = get_unqualified_type(skip_typeref(type_right->pointer.points_to));
7911                 if (!types_compatible(unqual_left, unqual_right)) {
7912                         errorf(pos,
7913                                "subtracting pointers to incompatible types '%T' and '%T'",
7914                                orig_type_left, orig_type_right);
7915                 } else if (!is_type_object(unqual_left)) {
7916                         if (is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) {
7917                                 warningf(pos, "subtracting pointers to void");
7918                         } else {
7919                                 errorf(pos, "subtracting pointers to non-object types '%T'",
7920                                        orig_type_left);
7921                         }
7922                 }
7923                 expression->base.type = type_ptrdiff_t;
7924         } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
7925                 errorf(pos, "invalid operands of types '%T' and '%T' to binary '-'",
7926                        orig_type_left, orig_type_right);
7927         }
7928 }
7929
7930 static void warn_string_literal_address(expression_t const* expr)
7931 {
7932         while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) {
7933                 expr = expr->unary.value;
7934                 if (expr->kind != EXPR_UNARY_DEREFERENCE)
7935                         return;
7936                 expr = expr->unary.value;
7937         }
7938
7939         if (expr->kind == EXPR_STRING_LITERAL ||
7940             expr->kind == EXPR_WIDE_STRING_LITERAL) {
7941                 warningf(&expr->base.source_position,
7942                         "comparison with string literal results in unspecified behaviour");
7943         }
7944 }
7945
7946 /**
7947  * Check the semantics of comparison expressions.
7948  *
7949  * @param expression   The expression to check.
7950  */
7951 static void semantic_comparison(binary_expression_t *expression)
7952 {
7953         expression_t *left  = expression->left;
7954         expression_t *right = expression->right;
7955
7956         if (warning.address) {
7957                 warn_string_literal_address(left);
7958                 warn_string_literal_address(right);
7959
7960                 expression_t const* const func_left = get_reference_address(left);
7961                 if (func_left != NULL && is_null_pointer_constant(right)) {
7962                         warningf(&expression->base.source_position,
7963                                 "the address of '%Y' will never be NULL",
7964                                 func_left->reference.declaration->symbol);
7965                 }
7966
7967                 expression_t const* const func_right = get_reference_address(right);
7968                 if (func_right != NULL && is_null_pointer_constant(right)) {
7969                         warningf(&expression->base.source_position,
7970                                 "the address of '%Y' will never be NULL",
7971                                 func_right->reference.declaration->symbol);
7972                 }
7973         }
7974
7975         type_t *orig_type_left  = left->base.type;
7976         type_t *orig_type_right = right->base.type;
7977         type_t *type_left       = skip_typeref(orig_type_left);
7978         type_t *type_right      = skip_typeref(orig_type_right);
7979
7980         /* TODO non-arithmetic types */
7981         if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
7982                 /* test for signed vs unsigned compares */
7983                 if (warning.sign_compare &&
7984                     (expression->base.kind != EXPR_BINARY_EQUAL &&
7985                      expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
7986                     (is_type_signed(type_left) != is_type_signed(type_right))) {
7987
7988                         /* check if 1 of the operands is a constant, in this case we just
7989                          * check wether we can safely represent the resulting constant in
7990                          * the type of the other operand. */
7991                         expression_t *const_expr = NULL;
7992                         expression_t *other_expr = NULL;
7993
7994                         if (is_constant_expression(left)) {
7995                                 const_expr = left;
7996                                 other_expr = right;
7997                         } else if (is_constant_expression(right)) {
7998                                 const_expr = right;
7999                                 other_expr = left;
8000                         }
8001
8002                         if (const_expr != NULL) {
8003                                 type_t *other_type = skip_typeref(other_expr->base.type);
8004                                 long    val        = fold_constant(const_expr);
8005                                 /* TODO: check if val can be represented by other_type */
8006                                 (void) other_type;
8007                                 (void) val;
8008                         }
8009                         warningf(&expression->base.source_position,
8010                                  "comparison between signed and unsigned");
8011                 }
8012                 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8013                 expression->left        = create_implicit_cast(left, arithmetic_type);
8014                 expression->right       = create_implicit_cast(right, arithmetic_type);
8015                 expression->base.type   = arithmetic_type;
8016                 if (warning.float_equal &&
8017                     (expression->base.kind == EXPR_BINARY_EQUAL ||
8018                      expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
8019                     is_type_float(arithmetic_type)) {
8020                         warningf(&expression->base.source_position,
8021                                  "comparing floating point with == or != is unsafe");
8022                 }
8023         } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
8024                 /* TODO check compatibility */
8025         } else if (is_type_pointer(type_left)) {
8026                 expression->right = create_implicit_cast(right, type_left);
8027         } else if (is_type_pointer(type_right)) {
8028                 expression->left = create_implicit_cast(left, type_right);
8029         } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8030                 type_error_incompatible("invalid operands in comparison",
8031                                         &expression->base.source_position,
8032                                         type_left, type_right);
8033         }
8034         expression->base.type = type_int;
8035 }
8036
8037 /**
8038  * Checks if a compound type has constant fields.
8039  */
8040 static bool has_const_fields(const compound_type_t *type)
8041 {
8042         const scope_t       *scope       = &type->declaration->scope;
8043         const declaration_t *declaration = scope->declarations;
8044
8045         for (; declaration != NULL; declaration = declaration->next) {
8046                 if (declaration->namespc != NAMESPACE_NORMAL)
8047                         continue;
8048
8049                 const type_t *decl_type = skip_typeref(declaration->type);
8050                 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
8051                         return true;
8052         }
8053         /* TODO */
8054         return false;
8055 }
8056
8057 static bool is_valid_assignment_lhs(expression_t const* const left)
8058 {
8059         type_t *const orig_type_left = revert_automatic_type_conversion(left);
8060         type_t *const type_left      = skip_typeref(orig_type_left);
8061
8062         if (!is_lvalue(left)) {
8063                 errorf(HERE, "left hand side '%E' of assignment is not an lvalue",
8064                        left);
8065                 return false;
8066         }
8067
8068         if (is_type_array(type_left)) {
8069                 errorf(HERE, "cannot assign to arrays ('%E')", left);
8070                 return false;
8071         }
8072         if (type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
8073                 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
8074                        orig_type_left);
8075                 return false;
8076         }
8077         if (is_type_incomplete(type_left)) {
8078                 errorf(HERE, "left-hand side '%E' of assignment has incomplete type '%T'",
8079                        left, orig_type_left);
8080                 return false;
8081         }
8082         if (is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
8083                 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
8084                        left, orig_type_left);
8085                 return false;
8086         }
8087
8088         return true;
8089 }
8090
8091 static void semantic_arithmetic_assign(binary_expression_t *expression)
8092 {
8093         expression_t *left            = expression->left;
8094         expression_t *right           = expression->right;
8095         type_t       *orig_type_left  = left->base.type;
8096         type_t       *orig_type_right = right->base.type;
8097
8098         if (!is_valid_assignment_lhs(left))
8099                 return;
8100
8101         type_t *type_left  = skip_typeref(orig_type_left);
8102         type_t *type_right = skip_typeref(orig_type_right);
8103
8104         if (!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
8105                 /* TODO: improve error message */
8106                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8107                         errorf(&expression->base.source_position,
8108                                "operation needs arithmetic types");
8109                 }
8110                 return;
8111         }
8112
8113         /* combined instructions are tricky. We can't create an implicit cast on
8114          * the left side, because we need the uncasted form for the store.
8115          * The ast2firm pass has to know that left_type must be right_type
8116          * for the arithmetic operation and create a cast by itself */
8117         type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
8118         expression->right       = create_implicit_cast(right, arithmetic_type);
8119         expression->base.type   = type_left;
8120 }
8121
8122 static void semantic_divmod_assign(binary_expression_t *expression)
8123 {
8124         semantic_arithmetic_assign(expression);
8125         warn_div_by_zero(expression);
8126 }
8127
8128 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
8129 {
8130         expression_t *const left            = expression->left;
8131         expression_t *const right           = expression->right;
8132         type_t       *const orig_type_left  = left->base.type;
8133         type_t       *const orig_type_right = right->base.type;
8134         type_t       *const type_left       = skip_typeref(orig_type_left);
8135         type_t       *const type_right      = skip_typeref(orig_type_right);
8136
8137         if (!is_valid_assignment_lhs(left))
8138                 return;
8139
8140         if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
8141                 /* combined instructions are tricky. We can't create an implicit cast on
8142                  * the left side, because we need the uncasted form for the store.
8143                  * The ast2firm pass has to know that left_type must be right_type
8144                  * for the arithmetic operation and create a cast by itself */
8145                 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
8146                 expression->right     = create_implicit_cast(right, arithmetic_type);
8147                 expression->base.type = type_left;
8148         } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
8149                 check_pointer_arithmetic(&expression->base.source_position,
8150                                          type_left, orig_type_left);
8151                 expression->base.type = type_left;
8152         } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
8153                 errorf(&expression->base.source_position,
8154                        "incompatible types '%T' and '%T' in assignment",
8155                        orig_type_left, orig_type_right);
8156         }
8157 }
8158
8159 /**
8160  * Check the semantic restrictions of a logical expression.
8161  */
8162 static void semantic_logical_op(binary_expression_t *expression)
8163 {
8164         expression_t *const left            = expression->left;
8165         expression_t *const right           = expression->right;
8166         type_t       *const orig_type_left  = left->base.type;
8167         type_t       *const orig_type_right = right->base.type;
8168         type_t       *const type_left       = skip_typeref(orig_type_left);
8169         type_t       *const type_right      = skip_typeref(orig_type_right);
8170
8171         warn_function_address_as_bool(left);
8172         warn_function_address_as_bool(right);
8173
8174         if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
8175                 /* TODO: improve error message */
8176                 if (is_type_valid(type_left) && is_type_valid(type_right)) {
8177                         errorf(&expression->base.source_position,
8178                                "operation needs scalar types");
8179                 }
8180                 return;
8181         }
8182
8183         expression->base.type = type_int;
8184 }
8185
8186 /**
8187  * Check the semantic restrictions of a binary assign expression.
8188  */
8189 static void semantic_binexpr_assign(binary_expression_t *expression)
8190 {
8191         expression_t *left           = expression->left;
8192         type_t       *orig_type_left = left->base.type;
8193
8194         if (!is_valid_assignment_lhs(left))
8195                 return;
8196
8197         assign_error_t error = semantic_assign(orig_type_left, expression->right);
8198         report_assign_error(error, orig_type_left, expression->right,
8199                         "assignment", &left->base.source_position);
8200         expression->right = create_implicit_cast(expression->right, orig_type_left);
8201         expression->base.type = orig_type_left;
8202 }
8203
8204 /**
8205  * Determine if the outermost operation (or parts thereof) of the given
8206  * expression has no effect in order to generate a warning about this fact.
8207  * Therefore in some cases this only examines some of the operands of the
8208  * expression (see comments in the function and examples below).
8209  * Examples:
8210  *   f() + 23;    // warning, because + has no effect
8211  *   x || f();    // no warning, because x controls execution of f()
8212  *   x ? y : f(); // warning, because y has no effect
8213  *   (void)x;     // no warning to be able to suppress the warning
8214  * This function can NOT be used for an "expression has definitely no effect"-
8215  * analysis. */
8216 static bool expression_has_effect(const expression_t *const expr)
8217 {
8218         switch (expr->kind) {
8219                 case EXPR_UNKNOWN:                   break;
8220                 case EXPR_INVALID:                   return true; /* do NOT warn */
8221                 case EXPR_REFERENCE:                 return false;
8222                 /* suppress the warning for microsoft __noop operations */
8223                 case EXPR_CONST:                     return expr->conste.is_ms_noop;
8224                 case EXPR_CHARACTER_CONSTANT:        return false;
8225                 case EXPR_WIDE_CHARACTER_CONSTANT:   return false;
8226                 case EXPR_STRING_LITERAL:            return false;
8227                 case EXPR_WIDE_STRING_LITERAL:       return false;
8228                 case EXPR_LABEL_ADDRESS:             return false;
8229
8230                 case EXPR_CALL: {
8231                         const call_expression_t *const call = &expr->call;
8232                         if (call->function->kind != EXPR_BUILTIN_SYMBOL)
8233                                 return true;
8234
8235                         switch (call->function->builtin_symbol.symbol->ID) {
8236                                 case T___builtin_va_end: return true;
8237                                 default:                 return false;
8238                         }
8239                 }
8240
8241                 /* Generate the warning if either the left or right hand side of a
8242                  * conditional expression has no effect */
8243                 case EXPR_CONDITIONAL: {
8244                         const conditional_expression_t *const cond = &expr->conditional;
8245                         return
8246                                 expression_has_effect(cond->true_expression) &&
8247                                 expression_has_effect(cond->false_expression);
8248                 }
8249
8250                 case EXPR_SELECT:                    return false;
8251                 case EXPR_ARRAY_ACCESS:              return false;
8252                 case EXPR_SIZEOF:                    return false;
8253                 case EXPR_CLASSIFY_TYPE:             return false;
8254                 case EXPR_ALIGNOF:                   return false;
8255
8256                 case EXPR_FUNCNAME:                  return false;
8257                 case EXPR_BUILTIN_SYMBOL:            break; /* handled in EXPR_CALL */
8258                 case EXPR_BUILTIN_CONSTANT_P:        return false;
8259                 case EXPR_BUILTIN_PREFETCH:          return true;
8260                 case EXPR_OFFSETOF:                  return false;
8261                 case EXPR_VA_START:                  return true;
8262                 case EXPR_VA_ARG:                    return true;
8263                 case EXPR_STATEMENT:                 return true; // TODO
8264                 case EXPR_COMPOUND_LITERAL:          return false;
8265
8266                 case EXPR_UNARY_NEGATE:              return false;
8267                 case EXPR_UNARY_PLUS:                return false;
8268                 case EXPR_UNARY_BITWISE_NEGATE:      return false;
8269                 case EXPR_UNARY_NOT:                 return false;
8270                 case EXPR_UNARY_DEREFERENCE:         return false;
8271                 case EXPR_UNARY_TAKE_ADDRESS:        return false;
8272                 case EXPR_UNARY_POSTFIX_INCREMENT:   return true;
8273                 case EXPR_UNARY_POSTFIX_DECREMENT:   return true;
8274                 case EXPR_UNARY_PREFIX_INCREMENT:    return true;
8275                 case EXPR_UNARY_PREFIX_DECREMENT:    return true;
8276
8277                 /* Treat void casts as if they have an effect in order to being able to
8278                  * suppress the warning */
8279                 case EXPR_UNARY_CAST: {
8280                         type_t *const type = skip_typeref(expr->base.type);
8281                         return is_type_atomic(type, ATOMIC_TYPE_VOID);
8282                 }
8283
8284                 case EXPR_UNARY_CAST_IMPLICIT:       return true;
8285                 case EXPR_UNARY_ASSUME:              return true;
8286
8287                 case EXPR_BINARY_ADD:                return false;
8288                 case EXPR_BINARY_SUB:                return false;
8289                 case EXPR_BINARY_MUL:                return false;
8290                 case EXPR_BINARY_DIV:                return false;
8291                 case EXPR_BINARY_MOD:                return false;
8292                 case EXPR_BINARY_EQUAL:              return false;
8293                 case EXPR_BINARY_NOTEQUAL:           return false;
8294                 case EXPR_BINARY_LESS:               return false;
8295                 case EXPR_BINARY_LESSEQUAL:          return false;
8296                 case EXPR_BINARY_GREATER:            return false;
8297                 case EXPR_BINARY_GREATEREQUAL:       return false;
8298                 case EXPR_BINARY_BITWISE_AND:        return false;
8299                 case EXPR_BINARY_BITWISE_OR:         return false;
8300                 case EXPR_BINARY_BITWISE_XOR:        return false;
8301                 case EXPR_BINARY_SHIFTLEFT:          return false;
8302                 case EXPR_BINARY_SHIFTRIGHT:         return false;
8303                 case EXPR_BINARY_ASSIGN:             return true;
8304                 case EXPR_BINARY_MUL_ASSIGN:         return true;
8305                 case EXPR_BINARY_DIV_ASSIGN:         return true;
8306                 case EXPR_BINARY_MOD_ASSIGN:         return true;
8307                 case EXPR_BINARY_ADD_ASSIGN:         return true;
8308                 case EXPR_BINARY_SUB_ASSIGN:         return true;
8309                 case EXPR_BINARY_SHIFTLEFT_ASSIGN:   return true;
8310                 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  return true;
8311                 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
8312                 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
8313                 case EXPR_BINARY_BITWISE_OR_ASSIGN:  return true;
8314
8315                 /* Only examine the right hand side of && and ||, because the left hand
8316                  * side already has the effect of controlling the execution of the right
8317                  * hand side */
8318                 case EXPR_BINARY_LOGICAL_AND:
8319                 case EXPR_BINARY_LOGICAL_OR:
8320                 /* Only examine the right hand side of a comma expression, because the left
8321                  * hand side has a separate warning */
8322                 case EXPR_BINARY_COMMA:
8323                         return expression_has_effect(expr->binary.right);
8324
8325                 case EXPR_BINARY_BUILTIN_EXPECT:     return true;
8326                 case EXPR_BINARY_ISGREATER:          return false;
8327                 case EXPR_BINARY_ISGREATEREQUAL:     return false;
8328                 case EXPR_BINARY_ISLESS:             return false;
8329                 case EXPR_BINARY_ISLESSEQUAL:        return false;
8330                 case EXPR_BINARY_ISLESSGREATER:      return false;
8331                 case EXPR_BINARY_ISUNORDERED:        return false;
8332         }
8333
8334         internal_errorf(HERE, "unexpected expression");
8335 }
8336
8337 static void semantic_comma(binary_expression_t *expression)
8338 {
8339         if (warning.unused_value) {
8340                 const expression_t *const left = expression->left;
8341                 if (!expression_has_effect(left)) {
8342                         warningf(&left->base.source_position,
8343                                  "left-hand operand of comma expression has no effect");
8344                 }
8345         }
8346         expression->base.type = expression->right->base.type;
8347 }
8348
8349 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr)  \
8350 static expression_t *parse_##binexpression_type(unsigned precedence,      \
8351                                                 expression_t *left)       \
8352 {                                                                         \
8353         expression_t *binexpr = allocate_expression_zero(binexpression_type); \
8354         binexpr->base.source_position = *HERE;                                \
8355         binexpr->binary.left          = left;                                 \
8356         eat(token_type);                                                      \
8357                                                                           \
8358         expression_t *right = parse_sub_expression(precedence + lr);          \
8359                                                                           \
8360         binexpr->binary.right = right;                                        \
8361         sfunc(&binexpr->binary);                                              \
8362                                                                           \
8363         return binexpr;                                                       \
8364 }
8365
8366 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA,    semantic_comma, 1)
8367 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL,      semantic_binexpr_arithmetic, 1)
8368 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV,      semantic_divmod_arithmetic, 1)
8369 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD,      semantic_divmod_arithmetic, 1)
8370 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD,      semantic_add, 1)
8371 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB,      semantic_sub, 1)
8372 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS,     semantic_comparison, 1)
8373 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER,  semantic_comparison, 1)
8374 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN,   semantic_binexpr_assign, 0)
8375
8376 CREATE_BINEXPR_PARSER(T_EQUALEQUAL,           EXPR_BINARY_EQUAL,
8377                       semantic_comparison, 1)
8378 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
8379                       semantic_comparison, 1)
8380 CREATE_BINEXPR_PARSER(T_LESSEQUAL,            EXPR_BINARY_LESSEQUAL,
8381                       semantic_comparison, 1)
8382 CREATE_BINEXPR_PARSER(T_GREATEREQUAL,         EXPR_BINARY_GREATEREQUAL,
8383                       semantic_comparison, 1)
8384
8385 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
8386                       semantic_binexpr_arithmetic, 1)
8387 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
8388                       semantic_binexpr_arithmetic, 1)
8389 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
8390                       semantic_binexpr_arithmetic, 1)
8391 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
8392                       semantic_logical_op, 1)
8393 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
8394                       semantic_logical_op, 1)
8395 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
8396                       semantic_shift_op, 1)
8397 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
8398                       semantic_shift_op, 1)
8399 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
8400                       semantic_arithmetic_addsubb_assign, 0)
8401 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
8402                       semantic_arithmetic_addsubb_assign, 0)
8403 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
8404                       semantic_arithmetic_assign, 0)
8405 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
8406                       semantic_divmod_assign, 0)
8407 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
8408                       semantic_divmod_assign, 0)
8409 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
8410                       semantic_arithmetic_assign, 0)
8411 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8412                       semantic_arithmetic_assign, 0)
8413 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
8414                       semantic_arithmetic_assign, 0)
8415 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
8416                       semantic_arithmetic_assign, 0)
8417 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
8418                       semantic_arithmetic_assign, 0)
8419
8420 static expression_t *parse_sub_expression(unsigned precedence)
8421 {
8422         if (token.type < 0) {
8423                 return expected_expression_error();
8424         }
8425
8426         expression_parser_function_t *parser
8427                 = &expression_parsers[token.type];
8428         source_position_t             source_position = token.source_position;
8429         expression_t                 *left;
8430
8431         if (parser->parser != NULL) {
8432                 left = parser->parser(parser->precedence);
8433         } else {
8434                 left = parse_primary_expression();
8435         }
8436         assert(left != NULL);
8437         left->base.source_position = source_position;
8438
8439         while(true) {
8440                 if (token.type < 0) {
8441                         return expected_expression_error();
8442                 }
8443
8444                 parser = &expression_parsers[token.type];
8445                 if (parser->infix_parser == NULL)
8446                         break;
8447                 if (parser->infix_precedence < precedence)
8448                         break;
8449
8450                 left = parser->infix_parser(parser->infix_precedence, left);
8451
8452                 assert(left != NULL);
8453                 assert(left->kind != EXPR_UNKNOWN);
8454                 left->base.source_position = source_position;
8455         }
8456
8457         return left;
8458 }
8459
8460 /**
8461  * Parse an expression.
8462  */
8463 static expression_t *parse_expression(void)
8464 {
8465         return parse_sub_expression(1);
8466 }
8467
8468 /**
8469  * Register a parser for a prefix-like operator with given precedence.
8470  *
8471  * @param parser      the parser function
8472  * @param token_type  the token type of the prefix token
8473  * @param precedence  the precedence of the operator
8474  */
8475 static void register_expression_parser(parse_expression_function parser,
8476                                        int token_type, unsigned precedence)
8477 {
8478         expression_parser_function_t *entry = &expression_parsers[token_type];
8479
8480         if (entry->parser != NULL) {
8481                 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8482                 panic("trying to register multiple expression parsers for a token");
8483         }
8484         entry->parser     = parser;
8485         entry->precedence = precedence;
8486 }
8487
8488 /**
8489  * Register a parser for an infix operator with given precedence.
8490  *
8491  * @param parser      the parser function
8492  * @param token_type  the token type of the infix operator
8493  * @param precedence  the precedence of the operator
8494  */
8495 static void register_infix_parser(parse_expression_infix_function parser,
8496                 int token_type, unsigned precedence)
8497 {
8498         expression_parser_function_t *entry = &expression_parsers[token_type];
8499
8500         if (entry->infix_parser != NULL) {
8501                 diagnosticf("for token '%k'\n", (token_type_t)token_type);
8502                 panic("trying to register multiple infix expression parsers for a "
8503                       "token");
8504         }
8505         entry->infix_parser     = parser;
8506         entry->infix_precedence = precedence;
8507 }
8508
8509 /**
8510  * Initialize the expression parsers.
8511  */
8512 static void init_expression_parsers(void)
8513 {
8514         memset(&expression_parsers, 0, sizeof(expression_parsers));
8515
8516         register_infix_parser(parse_array_expression,         '[',              30);
8517         register_infix_parser(parse_call_expression,          '(',              30);
8518         register_infix_parser(parse_select_expression,        '.',              30);
8519         register_infix_parser(parse_select_expression,        T_MINUSGREATER,   30);
8520         register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
8521                                                               T_PLUSPLUS,       30);
8522         register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
8523                                                               T_MINUSMINUS,     30);
8524
8525         register_infix_parser(parse_EXPR_BINARY_MUL,          '*',              17);
8526         register_infix_parser(parse_EXPR_BINARY_DIV,          '/',              17);
8527         register_infix_parser(parse_EXPR_BINARY_MOD,          '%',              17);
8528         register_infix_parser(parse_EXPR_BINARY_ADD,          '+',              16);
8529         register_infix_parser(parse_EXPR_BINARY_SUB,          '-',              16);
8530         register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT,    T_LESSLESS,       15);
8531         register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT,   T_GREATERGREATER, 15);
8532         register_infix_parser(parse_EXPR_BINARY_LESS,         '<',              14);
8533         register_infix_parser(parse_EXPR_BINARY_GREATER,      '>',              14);
8534         register_infix_parser(parse_EXPR_BINARY_LESSEQUAL,    T_LESSEQUAL,      14);
8535         register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL,   14);
8536         register_infix_parser(parse_EXPR_BINARY_EQUAL,        T_EQUALEQUAL,     13);
8537         register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
8538                                                     T_EXCLAMATIONMARKEQUAL, 13);
8539         register_infix_parser(parse_EXPR_BINARY_BITWISE_AND,  '&',              12);
8540         register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR,  '^',              11);
8541         register_infix_parser(parse_EXPR_BINARY_BITWISE_OR,   '|',              10);
8542         register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND,  T_ANDAND,          9);
8543         register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR,   T_PIPEPIPE,        8);
8544         register_infix_parser(parse_conditional_expression,   '?',               7);
8545         register_infix_parser(parse_EXPR_BINARY_ASSIGN,       '=',               2);
8546         register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN,   T_PLUSEQUAL,       2);
8547         register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN,   T_MINUSEQUAL,      2);
8548         register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN,   T_ASTERISKEQUAL,   2);
8549         register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN,   T_SLASHEQUAL,      2);
8550         register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN,   T_PERCENTEQUAL,    2);
8551         register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
8552                                                                 T_LESSLESSEQUAL, 2);
8553         register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
8554                                                           T_GREATERGREATEREQUAL, 2);
8555         register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
8556                                                                      T_ANDEQUAL, 2);
8557         register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
8558                                                                     T_PIPEEQUAL, 2);
8559         register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
8560                                                                    T_CARETEQUAL, 2);
8561
8562         register_infix_parser(parse_EXPR_BINARY_COMMA,        ',',               1);
8563
8564         register_expression_parser(parse_EXPR_UNARY_NEGATE,           '-',      25);
8565         register_expression_parser(parse_EXPR_UNARY_PLUS,             '+',      25);
8566         register_expression_parser(parse_EXPR_UNARY_NOT,              '!',      25);
8567         register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE,   '~',      25);
8568         register_expression_parser(parse_EXPR_UNARY_DEREFERENCE,      '*',      25);
8569         register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS,     '&',      25);
8570         register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
8571                                                                   T_PLUSPLUS,   25);
8572         register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
8573                                                                   T_MINUSMINUS, 25);
8574         register_expression_parser(parse_sizeof,                      T_sizeof, 25);
8575         register_expression_parser(parse_alignof,                T___alignof__, 25);
8576         register_expression_parser(parse_extension,            T___extension__, 25);
8577         register_expression_parser(parse_builtin_classify_type,
8578                                                      T___builtin_classify_type, 25);
8579 }
8580
8581 /**
8582  * Parse a asm statement arguments specification.
8583  */
8584 static asm_argument_t *parse_asm_arguments(bool is_out)
8585 {
8586         asm_argument_t *result = NULL;
8587         asm_argument_t *last   = NULL;
8588
8589         while (token.type == T_STRING_LITERAL || token.type == '[') {
8590                 asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
8591                 memset(argument, 0, sizeof(argument[0]));
8592
8593                 if (token.type == '[') {
8594                         eat('[');
8595                         if (token.type != T_IDENTIFIER) {
8596                                 parse_error_expected("while parsing asm argument",
8597                                                      T_IDENTIFIER, NULL);
8598                                 return NULL;
8599                         }
8600                         argument->symbol = token.v.symbol;
8601
8602                         expect(']');
8603                 }
8604
8605                 argument->constraints = parse_string_literals();
8606                 expect('(');
8607                 add_anchor_token(')');
8608                 expression_t *expression = parse_expression();
8609                 rem_anchor_token(')');
8610                 if (is_out) {
8611                         /* Ugly GCC stuff: Allow lvalue casts.  Skip casts, when they do not
8612                          * change size or type representation (e.g. int -> long is ok, but
8613                          * int -> float is not) */
8614                         if (expression->kind == EXPR_UNARY_CAST) {
8615                                 type_t      *const type = expression->base.type;
8616                                 type_kind_t  const kind = type->kind;
8617                                 if (kind == TYPE_ATOMIC || kind == TYPE_POINTER) {
8618                                         unsigned flags;
8619                                         unsigned size;
8620                                         if (kind == TYPE_ATOMIC) {
8621                                                 atomic_type_kind_t const akind = type->atomic.akind;
8622                                                 flags = get_atomic_type_flags(akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8623                                                 size  = get_atomic_type_size(akind);
8624                                         } else {
8625                                                 flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8626                                                 size  = get_atomic_type_size(get_intptr_kind());
8627                                         }
8628
8629                                         do {
8630                                                 expression_t *const value      = expression->unary.value;
8631                                                 type_t       *const value_type = value->base.type;
8632                                                 type_kind_t   const value_kind = value_type->kind;
8633
8634                                                 unsigned value_flags;
8635                                                 unsigned value_size;
8636                                                 if (value_kind == TYPE_ATOMIC) {
8637                                                         atomic_type_kind_t const value_akind = value_type->atomic.akind;
8638                                                         value_flags = get_atomic_type_flags(value_akind) & ~ATOMIC_TYPE_FLAG_SIGNED;
8639                                                         value_size  = get_atomic_type_size(value_akind);
8640                                                 } else if (value_kind == TYPE_POINTER) {
8641                                                         value_flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC;
8642                                                         value_size  = get_atomic_type_size(get_intptr_kind());
8643                                                 } else {
8644                                                         break;
8645                                                 }
8646
8647                                                 if (value_flags != flags || value_size != size)
8648                                                         break;
8649
8650                                                 expression = value;
8651                                         } while (expression->kind == EXPR_UNARY_CAST);
8652                                 }
8653                         }
8654
8655                         if (!is_lvalue(expression)) {
8656                                 errorf(&expression->base.source_position,
8657                                        "asm output argument is not an lvalue");
8658                         }
8659                 }
8660                 argument->expression = expression;
8661                 expect(')');
8662
8663                 set_address_taken(expression, true);
8664
8665                 if (last != NULL) {
8666                         last->next = argument;
8667                 } else {
8668                         result = argument;
8669                 }
8670                 last = argument;
8671
8672                 if (token.type != ',')
8673                         break;
8674                 eat(',');
8675         }
8676
8677         return result;
8678 end_error:
8679         return NULL;
8680 }
8681
8682 /**
8683  * Parse a asm statement clobber specification.
8684  */
8685 static asm_clobber_t *parse_asm_clobbers(void)
8686 {
8687         asm_clobber_t *result = NULL;
8688         asm_clobber_t *last   = NULL;
8689
8690         while(token.type == T_STRING_LITERAL) {
8691                 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
8692                 clobber->clobber       = parse_string_literals();
8693
8694                 if (last != NULL) {
8695                         last->next = clobber;
8696                 } else {
8697                         result = clobber;
8698                 }
8699                 last = clobber;
8700
8701                 if (token.type != ',')
8702                         break;
8703                 eat(',');
8704         }
8705
8706         return result;
8707 }
8708
8709 /**
8710  * Parse an asm statement.
8711  */
8712 static statement_t *parse_asm_statement(void)
8713 {
8714         statement_t     *statement     = allocate_statement_zero(STATEMENT_ASM);
8715         asm_statement_t *asm_statement = &statement->asms;
8716
8717         eat(T_asm);
8718
8719         if (token.type == T_volatile) {
8720                 next_token();
8721                 asm_statement->is_volatile = true;
8722         }
8723
8724         expect('(');
8725         add_anchor_token(')');
8726         add_anchor_token(':');
8727         asm_statement->asm_text = parse_string_literals();
8728
8729         if (token.type != ':') {
8730                 rem_anchor_token(':');
8731                 goto end_of_asm;
8732         }
8733         eat(':');
8734
8735         asm_statement->outputs = parse_asm_arguments(true);
8736         if (token.type != ':') {
8737                 rem_anchor_token(':');
8738                 goto end_of_asm;
8739         }
8740         eat(':');
8741
8742         asm_statement->inputs = parse_asm_arguments(false);
8743         if (token.type != ':') {
8744                 rem_anchor_token(':');
8745                 goto end_of_asm;
8746         }
8747         rem_anchor_token(':');
8748         eat(':');
8749
8750         asm_statement->clobbers = parse_asm_clobbers();
8751
8752 end_of_asm:
8753         rem_anchor_token(')');
8754         expect(')');
8755         expect(';');
8756
8757         if (asm_statement->outputs == NULL) {
8758                 /* GCC: An 'asm' instruction without any output operands will be treated
8759                  * identically to a volatile 'asm' instruction. */
8760                 asm_statement->is_volatile = true;
8761         }
8762
8763         return statement;
8764 end_error:
8765         return create_invalid_statement();
8766 }
8767
8768 /**
8769  * Parse a case statement.
8770  */
8771 static statement_t *parse_case_statement(void)
8772 {
8773         statement_t       *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8774         source_position_t *const pos       = &statement->base.source_position;
8775
8776         eat(T_case);
8777
8778         expression_t *const expression   = parse_expression();
8779         statement->case_label.expression = expression;
8780         if (!is_constant_expression(expression)) {
8781                 /* This check does not prevent the error message in all cases of an
8782                  * prior error while parsing the expression.  At least it catches the
8783                  * common case of a mistyped enum entry. */
8784                 if (is_type_valid(skip_typeref(expression->base.type))) {
8785                         errorf(pos, "case label does not reduce to an integer constant");
8786                 }
8787                 statement->case_label.is_bad = true;
8788         } else {
8789                 long const val = fold_constant(expression);
8790                 statement->case_label.first_case = val;
8791                 statement->case_label.last_case  = val;
8792         }
8793
8794         if (GNU_MODE) {
8795                 if (token.type == T_DOTDOTDOT) {
8796                         next_token();
8797                         expression_t *const end_range   = parse_expression();
8798                         statement->case_label.end_range = end_range;
8799                         if (!is_constant_expression(end_range)) {
8800                                 /* This check does not prevent the error message in all cases of an
8801                                  * prior error while parsing the expression.  At least it catches the
8802                                  * common case of a mistyped enum entry. */
8803                                 if (is_type_valid(end_range->base.type)) {
8804                                         errorf(pos, "case range does not reduce to an integer constant");
8805                                 }
8806                                 statement->case_label.is_bad = true;
8807                         } else {
8808                                 long const val = fold_constant(end_range);
8809                                 statement->case_label.last_case = val;
8810
8811                                 if (val < statement->case_label.first_case) {
8812                                         statement->case_label.is_empty_range = true;
8813                                         warningf(pos, "empty range specified");
8814                                 }
8815                         }
8816                 }
8817         }
8818
8819         PUSH_PARENT(statement);
8820
8821         expect(':');
8822
8823         if (current_switch != NULL) {
8824                 if (! statement->case_label.is_bad) {
8825                         /* Check for duplicate case values */
8826                         case_label_statement_t *c = &statement->case_label;
8827                         for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) {
8828                                 if (l->is_bad || l->is_empty_range || l->expression == NULL)
8829                                         continue;
8830
8831                                 if (c->last_case < l->first_case || c->first_case > l->last_case)
8832                                         continue;
8833
8834                                 errorf(pos, "duplicate case value (previously used %P)",
8835                                        &l->base.source_position);
8836                                 break;
8837                         }
8838                 }
8839                 /* link all cases into the switch statement */
8840                 if (current_switch->last_case == NULL) {
8841                         current_switch->first_case      = &statement->case_label;
8842                 } else {
8843                         current_switch->last_case->next = &statement->case_label;
8844                 }
8845                 current_switch->last_case = &statement->case_label;
8846         } else {
8847                 errorf(pos, "case label not within a switch statement");
8848         }
8849
8850         statement_t *const inner_stmt = parse_statement();
8851         statement->case_label.statement = inner_stmt;
8852         if (inner_stmt->kind == STATEMENT_DECLARATION) {
8853                 errorf(&inner_stmt->base.source_position, "declaration after case label");
8854         }
8855
8856         POP_PARENT;
8857         return statement;
8858 end_error:
8859         POP_PARENT;
8860         return create_invalid_statement();
8861 }
8862
8863 /**
8864  * Parse a default statement.
8865  */
8866 static statement_t *parse_default_statement(void)
8867 {
8868         statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
8869
8870         eat(T_default);
8871
8872         PUSH_PARENT(statement);
8873
8874         expect(':');
8875         if (current_switch != NULL) {
8876                 const case_label_statement_t *def_label = current_switch->default_label;
8877                 if (def_label != NULL) {
8878                         errorf(HERE, "multiple default labels in one switch (previous declared %P)",
8879                                &def_label->base.source_position);
8880                 } else {
8881                         current_switch->default_label = &statement->case_label;
8882
8883                         /* link all cases into the switch statement */
8884                         if (current_switch->last_case == NULL) {
8885                                 current_switch->first_case      = &statement->case_label;
8886                         } else {
8887                                 current_switch->last_case->next = &statement->case_label;
8888                         }
8889                         current_switch->last_case = &statement->case_label;
8890                 }
8891         } else {
8892                 errorf(&statement->base.source_position,
8893                         "'default' label not within a switch statement");
8894         }
8895
8896         statement_t *const inner_stmt = parse_statement();
8897         statement->case_label.statement = inner_stmt;
8898         if (inner_stmt->kind == STATEMENT_DECLARATION) {
8899                 errorf(&inner_stmt->base.source_position, "declaration after default label");
8900         }
8901
8902         POP_PARENT;
8903         return statement;
8904 end_error:
8905         POP_PARENT;
8906         return create_invalid_statement();
8907 }
8908
8909 /**
8910  * Parse a label statement.
8911  */
8912 static statement_t *parse_label_statement(void)
8913 {
8914         assert(token.type == T_IDENTIFIER);
8915         symbol_t      *symbol = token.v.symbol;
8916         declaration_t *label  = get_label(symbol);
8917
8918         statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL);
8919         statement->label.label       = label;
8920
8921         next_token();
8922
8923         PUSH_PARENT(statement);
8924
8925         /* if statement is already set then the label is defined twice,
8926          * otherwise it was just mentioned in a goto/local label declaration so far */
8927         if (label->init.statement != NULL) {
8928                 errorf(HERE, "duplicate label '%Y' (declared %P)",
8929                        symbol, &label->source_position);
8930         } else {
8931                 label->source_position = token.source_position;
8932                 label->init.statement  = statement;
8933         }
8934
8935         eat(':');
8936
8937         if (token.type == '}') {
8938                 /* TODO only warn? */
8939                 if (false) {
8940                         warningf(HERE, "label at end of compound statement");
8941                         statement->label.statement = create_empty_statement();
8942                 } else {
8943                         errorf(HERE, "label at end of compound statement");
8944                         statement->label.statement = create_invalid_statement();
8945                 }
8946         } else if (token.type == ';') {
8947                 /* Eat an empty statement here, to avoid the warning about an empty
8948                  * statement after a label.  label:; is commonly used to have a label
8949                  * before a closing brace. */
8950                 statement->label.statement = create_empty_statement();
8951                 next_token();
8952         } else {
8953                 statement_t *const inner_stmt = parse_statement();
8954                 statement->label.statement = inner_stmt;
8955                 if (inner_stmt->kind == STATEMENT_DECLARATION) {
8956                         errorf(&inner_stmt->base.source_position, "declaration after label");
8957                 }
8958         }
8959
8960         /* remember the labels in a list for later checking */
8961         if (label_last == NULL) {
8962                 label_first = &statement->label;
8963         } else {
8964                 label_last->next = &statement->label;
8965         }
8966         label_last = &statement->label;
8967
8968         POP_PARENT;
8969         return statement;
8970 }
8971
8972 /**
8973  * Parse an if statement.
8974  */
8975 static statement_t *parse_if(void)
8976 {
8977         statement_t *statement = allocate_statement_zero(STATEMENT_IF);
8978
8979         eat(T_if);
8980
8981         PUSH_PARENT(statement);
8982
8983         add_anchor_token('{');
8984
8985         expect('(');
8986         add_anchor_token(')');
8987         statement->ifs.condition = parse_expression();
8988         rem_anchor_token(')');
8989         expect(')');
8990
8991 end_error:
8992         rem_anchor_token('{');
8993
8994         add_anchor_token(T_else);
8995         statement->ifs.true_statement = parse_statement();
8996         rem_anchor_token(T_else);
8997
8998         if (token.type == T_else) {
8999                 next_token();
9000                 statement->ifs.false_statement = parse_statement();
9001         }
9002
9003         POP_PARENT;
9004         return statement;
9005 }
9006
9007 /**
9008  * Check that all enums are handled in a switch.
9009  *
9010  * @param statement  the switch statement to check
9011  */
9012 static void check_enum_cases(const switch_statement_t *statement) {
9013         const type_t *type = skip_typeref(statement->expression->base.type);
9014         if (! is_type_enum(type))
9015                 return;
9016         const enum_type_t *enumt = &type->enumt;
9017
9018         /* if we have a default, no warnings */
9019         if (statement->default_label != NULL)
9020                 return;
9021
9022         /* FIXME: calculation of value should be done while parsing */
9023         const declaration_t *declaration;
9024         long last_value = -1;
9025         for (declaration = enumt->declaration->next;
9026              declaration != NULL && declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY;
9027                  declaration = declaration->next) {
9028                 const expression_t *expression = declaration->init.enum_value;
9029                 long                value      = expression != NULL ? fold_constant(expression) : last_value + 1;
9030                 bool                found      = false;
9031                 for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
9032                         if (l->expression == NULL)
9033                                 continue;
9034                         if (l->first_case <= value && value <= l->last_case) {
9035                                 found = true;
9036                                 break;
9037                         }
9038                 }
9039                 if (! found) {
9040                         warningf(&statement->base.source_position,
9041                                 "enumeration value '%Y' not handled in switch", declaration->symbol);
9042                 }
9043                 last_value = value;
9044         }
9045 }
9046
9047 /**
9048  * Parse a switch statement.
9049  */
9050 static statement_t *parse_switch(void)
9051 {
9052         statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
9053
9054         eat(T_switch);
9055
9056         PUSH_PARENT(statement);
9057
9058         expect('(');
9059         add_anchor_token(')');
9060         expression_t *const expr = parse_expression();
9061         type_t       *      type = skip_typeref(expr->base.type);
9062         if (is_type_integer(type)) {
9063                 type = promote_integer(type);
9064                 if (warning.traditional) {
9065                         if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) {
9066                                 warningf(&expr->base.source_position,
9067                                         "'%T' switch expression not converted to '%T' in ISO C",
9068                                         type, type_int);
9069                         }
9070                 }
9071         } else if (is_type_valid(type)) {
9072                 errorf(&expr->base.source_position,
9073                        "switch quantity is not an integer, but '%T'", type);
9074                 type = type_error_type;
9075         }
9076         statement->switchs.expression = create_implicit_cast(expr, type);
9077         expect(')');
9078         rem_anchor_token(')');
9079
9080         switch_statement_t *rem = current_switch;
9081         current_switch          = &statement->switchs;
9082         statement->switchs.body = parse_statement();
9083         current_switch          = rem;
9084
9085         if (warning.switch_default &&
9086             statement->switchs.default_label == NULL) {
9087                 warningf(&statement->base.source_position, "switch has no default case");
9088         }
9089         if (warning.switch_enum)
9090                 check_enum_cases(&statement->switchs);
9091
9092         POP_PARENT;
9093         return statement;
9094 end_error:
9095         POP_PARENT;
9096         return create_invalid_statement();
9097 }
9098
9099 static statement_t *parse_loop_body(statement_t *const loop)
9100 {
9101         statement_t *const rem = current_loop;
9102         current_loop = loop;
9103
9104         statement_t *const body = parse_statement();
9105
9106         current_loop = rem;
9107         return body;
9108 }
9109
9110 /**
9111  * Parse a while statement.
9112  */
9113 static statement_t *parse_while(void)
9114 {
9115         statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
9116
9117         eat(T_while);
9118
9119         PUSH_PARENT(statement);
9120
9121         expect('(');
9122         add_anchor_token(')');
9123         statement->whiles.condition = parse_expression();
9124         rem_anchor_token(')');
9125         expect(')');
9126
9127         statement->whiles.body = parse_loop_body(statement);
9128
9129         POP_PARENT;
9130         return statement;
9131 end_error:
9132         POP_PARENT;
9133         return create_invalid_statement();
9134 }
9135
9136 /**
9137  * Parse a do statement.
9138  */
9139 static statement_t *parse_do(void)
9140 {
9141         statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
9142
9143         eat(T_do);
9144
9145         PUSH_PARENT(statement)
9146
9147         add_anchor_token(T_while);
9148         statement->do_while.body = parse_loop_body(statement);
9149         rem_anchor_token(T_while);
9150
9151         expect(T_while);
9152         expect('(');
9153         add_anchor_token(')');
9154         statement->do_while.condition = parse_expression();
9155         rem_anchor_token(')');
9156         expect(')');
9157         expect(';');
9158
9159         POP_PARENT;
9160         return statement;
9161 end_error:
9162         POP_PARENT;
9163         return create_invalid_statement();
9164 }
9165
9166 /**
9167  * Parse a for statement.
9168  */
9169 static statement_t *parse_for(void)
9170 {
9171         statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
9172
9173         eat(T_for);
9174
9175         PUSH_PARENT(statement);
9176
9177         size_t const top = environment_top();
9178         scope_push(&statement->fors.scope);
9179
9180         expect('(');
9181         add_anchor_token(')');
9182
9183         if (token.type != ';') {
9184                 if (is_declaration_specifier(&token, false)) {
9185                         parse_declaration(record_declaration);
9186                 } else {
9187                         add_anchor_token(';');
9188                         expression_t *const init = parse_expression();
9189                         statement->fors.initialisation = init;
9190                         if (warning.unused_value && !expression_has_effect(init)) {
9191                                 warningf(&init->base.source_position,
9192                                          "initialisation of 'for'-statement has no effect");
9193                         }
9194                         rem_anchor_token(';');
9195                         expect(';');
9196                 }
9197         } else {
9198                 expect(';');
9199         }
9200
9201         if (token.type != ';') {
9202                 add_anchor_token(';');
9203                 statement->fors.condition = parse_expression();
9204                 rem_anchor_token(';');
9205         }
9206         expect(';');
9207         if (token.type != ')') {
9208                 expression_t *const step = parse_expression();
9209                 statement->fors.step = step;
9210                 if (warning.unused_value && !expression_has_effect(step)) {
9211                         warningf(&step->base.source_position,
9212                                  "step of 'for'-statement has no effect");
9213                 }
9214         }
9215         rem_anchor_token(')');
9216         expect(')');
9217         statement->fors.body = parse_loop_body(statement);
9218
9219         assert(scope == &statement->fors.scope);
9220         scope_pop();
9221         environment_pop_to(top);
9222
9223         POP_PARENT;
9224         return statement;
9225
9226 end_error:
9227         POP_PARENT;
9228         rem_anchor_token(')');
9229         assert(scope == &statement->fors.scope);
9230         scope_pop();
9231         environment_pop_to(top);
9232
9233         return create_invalid_statement();
9234 }
9235
9236 /**
9237  * Parse a goto statement.
9238  */
9239 static statement_t *parse_goto(void)
9240 {
9241         statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
9242         eat(T_goto);
9243
9244         if (GNU_MODE && token.type == '*') {
9245                 next_token();
9246                 expression_t *expression = parse_expression();
9247
9248                 /* Argh: although documentation say the expression must be of type void *,
9249                  * gcc excepts anything that can be casted into void * without error */
9250                 type_t *type = expression->base.type;
9251
9252                 if (type != type_error_type) {
9253                         if (!is_type_pointer(type) && !is_type_integer(type)) {
9254                                 errorf(&expression->base.source_position,
9255                                         "cannot convert to a pointer type");
9256                         } else if (type != type_void_ptr) {
9257                                 warningf(&expression->base.source_position,
9258                                         "type of computed goto expression should be 'void*' not '%T'", type);
9259                         }
9260                         expression = create_implicit_cast(expression, type_void_ptr);
9261                 }
9262
9263                 statement->gotos.expression = expression;
9264         } else {
9265                 if (token.type != T_IDENTIFIER) {
9266                         if (GNU_MODE)
9267                                 parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL);
9268                         else
9269                                 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
9270                         eat_until_anchor();
9271                         goto end_error;
9272                 }
9273                 symbol_t *symbol = token.v.symbol;
9274                 next_token();
9275
9276                 statement->gotos.label = get_label(symbol);
9277
9278                 if (statement->gotos.label->parent_scope->depth < current_function->scope.depth) {
9279                         statement->gotos.outer_fkt_jmp = true;
9280                 }
9281         }
9282
9283         /* remember the goto's in a list for later checking */
9284         if (goto_last == NULL) {
9285                 goto_first = &statement->gotos;
9286         } else {
9287                 goto_last->next = &statement->gotos;
9288         }
9289         goto_last = &statement->gotos;
9290
9291         expect(';');
9292
9293         return statement;
9294 end_error:
9295         return create_invalid_statement();
9296 }
9297
9298 /**
9299  * Parse a continue statement.
9300  */
9301 static statement_t *parse_continue(void)
9302 {
9303         if (current_loop == NULL) {
9304                 errorf(HERE, "continue statement not within loop");
9305         }
9306
9307         statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE);
9308
9309         eat(T_continue);
9310         expect(';');
9311
9312 end_error:
9313         return statement;
9314 }
9315
9316 /**
9317  * Parse a break statement.
9318  */
9319 static statement_t *parse_break(void)
9320 {
9321         if (current_switch == NULL && current_loop == NULL) {
9322                 errorf(HERE, "break statement not within loop or switch");
9323         }
9324
9325         statement_t *statement = allocate_statement_zero(STATEMENT_BREAK);
9326
9327         eat(T_break);
9328         expect(';');
9329
9330 end_error:
9331         return statement;
9332 }
9333
9334 /**
9335  * Parse a __leave statement.
9336  */
9337 static statement_t *parse_leave_statement(void)
9338 {
9339         if (current_try == NULL) {
9340                 errorf(HERE, "__leave statement not within __try");
9341         }
9342
9343         statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE);
9344
9345         eat(T___leave);
9346         expect(';');
9347
9348 end_error:
9349         return statement;
9350 }
9351
9352 /**
9353  * Check if a given declaration represents a local variable.
9354  */
9355 static bool is_local_var_declaration(const declaration_t *declaration)
9356 {
9357         switch ((storage_class_tag_t) declaration->storage_class) {
9358         case STORAGE_CLASS_AUTO:
9359         case STORAGE_CLASS_REGISTER: {
9360                 const type_t *type = skip_typeref(declaration->type);
9361                 if (is_type_function(type)) {
9362                         return false;
9363                 } else {
9364                         return true;
9365                 }
9366         }
9367         default:
9368                 return false;
9369         }
9370 }
9371
9372 /**
9373  * Check if a given declaration represents a variable.
9374  */
9375 static bool is_var_declaration(const declaration_t *declaration)
9376 {
9377         if (declaration->storage_class == STORAGE_CLASS_TYPEDEF)
9378                 return false;
9379
9380         const type_t *type = skip_typeref(declaration->type);
9381         return !is_type_function(type);
9382 }
9383
9384 /**
9385  * Check if a given expression represents a local variable.
9386  */
9387 static bool is_local_variable(const expression_t *expression)
9388 {
9389         if (expression->base.kind != EXPR_REFERENCE) {
9390                 return false;
9391         }
9392         const declaration_t *declaration = expression->reference.declaration;
9393         return is_local_var_declaration(declaration);
9394 }
9395
9396 /**
9397  * Check if a given expression represents a local variable and
9398  * return its declaration then, else return NULL.
9399  */
9400 declaration_t *expr_is_variable(const expression_t *expression)
9401 {
9402         if (expression->base.kind != EXPR_REFERENCE) {
9403                 return NULL;
9404         }
9405         declaration_t *declaration = expression->reference.declaration;
9406         if (is_var_declaration(declaration))
9407                 return declaration;
9408         return NULL;
9409 }
9410
9411 /**
9412  * Parse a return statement.
9413  */
9414 static statement_t *parse_return(void)
9415 {
9416         eat(T_return);
9417
9418         statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
9419
9420         expression_t *return_value = NULL;
9421         if (token.type != ';') {
9422                 return_value = parse_expression();
9423         }
9424
9425         const type_t *const func_type = current_function->type;
9426         assert(is_type_function(func_type));
9427         type_t *const return_type = skip_typeref(func_type->function.return_type);
9428
9429         if (return_value != NULL) {
9430                 type_t *return_value_type = skip_typeref(return_value->base.type);
9431
9432                 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)
9433                                 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
9434                         warningf(&statement->base.source_position,
9435                                  "'return' with a value, in function returning void");
9436                         return_value = NULL;
9437                 } else {
9438                         assign_error_t error = semantic_assign(return_type, return_value);
9439                         report_assign_error(error, return_type, return_value, "'return'",
9440                                             &statement->base.source_position);
9441                         return_value = create_implicit_cast(return_value, return_type);
9442                 }
9443                 /* check for returning address of a local var */
9444                 if (return_value != NULL &&
9445                                 return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
9446                         const expression_t *expression = return_value->unary.value;
9447                         if (is_local_variable(expression)) {
9448                                 warningf(&statement->base.source_position,
9449                                          "function returns address of local variable");
9450                         }
9451                 }
9452         } else {
9453                 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
9454                         warningf(&statement->base.source_position,
9455                                  "'return' without value, in function returning non-void");
9456                 }
9457         }
9458         statement->returns.value = return_value;
9459
9460         expect(';');
9461
9462 end_error:
9463         return statement;
9464 }
9465
9466 /**
9467  * Parse a declaration statement.
9468  */
9469 static statement_t *parse_declaration_statement(void)
9470 {
9471         statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9472
9473         declaration_t *before = last_declaration;
9474         if (GNU_MODE)
9475                 parse_external_declaration();
9476         else
9477                 parse_declaration(record_declaration);
9478
9479         if (before == NULL) {
9480                 statement->declaration.declarations_begin = scope->declarations;
9481         } else {
9482                 statement->declaration.declarations_begin = before->next;
9483         }
9484         statement->declaration.declarations_end = last_declaration;
9485
9486         return statement;
9487 }
9488
9489 /**
9490  * Parse an expression statement, ie. expr ';'.
9491  */
9492 static statement_t *parse_expression_statement(void)
9493 {
9494         statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
9495
9496         expression_t *const expr         = parse_expression();
9497         statement->expression.expression = expr;
9498
9499         expect(';');
9500
9501 end_error:
9502         return statement;
9503 }
9504
9505 /**
9506  * Parse a microsoft __try { } __finally { } or
9507  * __try{ } __except() { }
9508  */
9509 static statement_t *parse_ms_try_statment(void)
9510 {
9511         statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
9512         eat(T___try);
9513
9514         PUSH_PARENT(statement);
9515
9516         ms_try_statement_t *rem = current_try;
9517         current_try = &statement->ms_try;
9518         statement->ms_try.try_statement = parse_compound_statement(false);
9519         current_try = rem;
9520
9521         POP_PARENT;
9522
9523         if (token.type == T___except) {
9524                 eat(T___except);
9525                 expect('(');
9526                 add_anchor_token(')');
9527                 expression_t *const expr = parse_expression();
9528                 type_t       *      type = skip_typeref(expr->base.type);
9529                 if (is_type_integer(type)) {
9530                         type = promote_integer(type);
9531                 } else if (is_type_valid(type)) {
9532                         errorf(&expr->base.source_position,
9533                                "__expect expression is not an integer, but '%T'", type);
9534                         type = type_error_type;
9535                 }
9536                 statement->ms_try.except_expression = create_implicit_cast(expr, type);
9537                 rem_anchor_token(')');
9538                 expect(')');
9539                 statement->ms_try.final_statement = parse_compound_statement(false);
9540         } else if (token.type == T__finally) {
9541                 eat(T___finally);
9542                 statement->ms_try.final_statement = parse_compound_statement(false);
9543         } else {
9544                 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
9545                 return create_invalid_statement();
9546         }
9547         return statement;
9548 end_error:
9549         return create_invalid_statement();
9550 }
9551
9552 static statement_t *parse_empty_statement(void)
9553 {
9554         if (warning.empty_statement) {
9555                 warningf(HERE, "statement is empty");
9556         }
9557         statement_t *const statement = create_empty_statement();
9558         eat(';');
9559         return statement;
9560 }
9561
9562 static statement_t *parse_local_label_declaration(void) {
9563         statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
9564
9565         eat(T___label__);
9566
9567         declaration_t *begin = NULL, *end = NULL;
9568
9569         while (true) {
9570                 if (token.type != T_IDENTIFIER) {
9571                         parse_error_expected("while parsing local label declaration",
9572                                 T_IDENTIFIER, NULL);
9573                         goto end_error;
9574                 }
9575                 symbol_t      *symbol      = token.v.symbol;
9576                 declaration_t *declaration = get_declaration(symbol, NAMESPACE_LOCAL_LABEL);
9577                 if (declaration != NULL) {
9578                         errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition at %P)",
9579                                 symbol, &declaration->source_position);
9580                 } else {
9581                         declaration = allocate_declaration_zero();
9582                         declaration->namespc         = NAMESPACE_LOCAL_LABEL;
9583                         declaration->source_position = token.source_position;
9584                         declaration->symbol          = symbol;
9585                         declaration->parent_scope    = scope;
9586                         declaration->init.statement  = NULL;
9587
9588                         if (end != NULL)
9589                                 end->next = declaration;
9590                         end = declaration;
9591                         if (begin == NULL)
9592                                 begin = declaration;
9593
9594                         local_label_push(declaration);
9595                 }
9596                 next_token();
9597
9598                 if (token.type != ',')
9599                         break;
9600                 next_token();
9601         }
9602         eat(';');
9603 end_error:
9604         statement->declaration.declarations_begin = begin;
9605         statement->declaration.declarations_end   = end;
9606         return statement;
9607 }
9608
9609 /**
9610  * Parse a statement.
9611  * There's also parse_statement() which additionally checks for
9612  * "statement has no effect" warnings
9613  */
9614 static statement_t *intern_parse_statement(void)
9615 {
9616         statement_t *statement = NULL;
9617
9618         /* declaration or statement */
9619         add_anchor_token(';');
9620         switch (token.type) {
9621         case T_IDENTIFIER: {
9622                 token_type_t la1_type = (token_type_t)look_ahead(1)->type;
9623                 if (la1_type == ':') {
9624                         statement = parse_label_statement();
9625                 } else if (is_typedef_symbol(token.v.symbol)) {
9626                         statement = parse_declaration_statement();
9627                 } else switch (la1_type) {
9628                         case '*':
9629                                 if (get_declaration(token.v.symbol, NAMESPACE_NORMAL) != NULL)
9630                                         goto expression_statment;
9631                                 /* FALLTHROUGH */
9632
9633                         DECLARATION_START
9634                         case T_IDENTIFIER:
9635                                 statement = parse_declaration_statement();
9636                                 break;
9637
9638                         default:
9639 expression_statment:
9640                                 statement = parse_expression_statement();
9641                                 break;
9642                 }
9643                 break;
9644         }
9645
9646         case T___extension__:
9647                 /* This can be a prefix to a declaration or an expression statement.
9648                  * We simply eat it now and parse the rest with tail recursion. */
9649                 do {
9650                         next_token();
9651                 } while (token.type == T___extension__);
9652                 bool old_gcc_extension = in_gcc_extension;
9653                 in_gcc_extension       = true;
9654                 statement = parse_statement();
9655                 in_gcc_extension = old_gcc_extension;
9656                 break;
9657
9658         DECLARATION_START
9659                 statement = parse_declaration_statement();
9660                 break;
9661
9662         case T___label__:
9663                 statement = parse_local_label_declaration();
9664                 break;
9665
9666         case ';':        statement = parse_empty_statement();         break;
9667         case '{':        statement = parse_compound_statement(false); break;
9668         case T___leave:  statement = parse_leave_statement();         break;
9669         case T___try:    statement = parse_ms_try_statment();         break;
9670         case T_asm:      statement = parse_asm_statement();           break;
9671         case T_break:    statement = parse_break();                   break;
9672         case T_case:     statement = parse_case_statement();          break;
9673         case T_continue: statement = parse_continue();                break;
9674         case T_default:  statement = parse_default_statement();       break;
9675         case T_do:       statement = parse_do();                      break;
9676         case T_for:      statement = parse_for();                     break;
9677         case T_goto:     statement = parse_goto();                    break;
9678         case T_if:       statement = parse_if ();                     break;
9679         case T_return:   statement = parse_return();                  break;
9680         case T_switch:   statement = parse_switch();                  break;
9681         case T_while:    statement = parse_while();                   break;
9682
9683         case '!':
9684         case '&':
9685         case '(':
9686         case '*':
9687         case '+':
9688         case '-':
9689         case '~':
9690         case T_ANDAND:
9691         case T_CHARACTER_CONSTANT:
9692         case T_FLOATINGPOINT:
9693         case T_INTEGER:
9694         case T_MINUSMINUS:
9695         case T_PLUSPLUS:
9696         case T_STRING_LITERAL:
9697         case T_WIDE_CHARACTER_CONSTANT:
9698         case T_WIDE_STRING_LITERAL:
9699         case T___FUNCDNAME__:
9700         case T___FUNCSIG__:
9701         case T___FUNCTION__:
9702         case T___PRETTY_FUNCTION__:
9703         case T___builtin_alloca:
9704         case T___builtin_classify_type:
9705         case T___builtin_constant_p:
9706         case T___builtin_expect:
9707         case T___builtin_huge_val:
9708         case T___builtin_isgreater:
9709         case T___builtin_isgreaterequal:
9710         case T___builtin_isless:
9711         case T___builtin_islessequal:
9712         case T___builtin_islessgreater:
9713         case T___builtin_isunordered:
9714         case T___builtin_inf:
9715         case T___builtin_inff:
9716         case T___builtin_infl:
9717         case T___builtin_nan:
9718         case T___builtin_nanf:
9719         case T___builtin_nanl:
9720         case T___builtin_offsetof:
9721         case T___builtin_prefetch:
9722         case T___builtin_va_arg:
9723         case T___builtin_va_end:
9724         case T___builtin_va_start:
9725         case T___func__:
9726         case T___noop:
9727         case T__assume:
9728                 statement = parse_expression_statement();
9729                 break;
9730
9731         default:
9732                 errorf(HERE, "unexpected token %K while parsing statement", &token);
9733                 statement = create_invalid_statement();
9734                 if (!at_anchor())
9735                         next_token();
9736                 break;
9737         }
9738         rem_anchor_token(';');
9739
9740         assert(statement != NULL
9741                         && statement->base.source_position.input_name != NULL);
9742
9743         return statement;
9744 }
9745
9746 /**
9747  * parse a statement and emits "statement has no effect" warning if needed
9748  * (This is really a wrapper around intern_parse_statement with check for 1
9749  *  single warning. It is needed, because for statement expressions we have
9750  *  to avoid the warning on the last statement)
9751  */
9752 static statement_t *parse_statement(void)
9753 {
9754         statement_t *statement = intern_parse_statement();
9755
9756         if (statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
9757                 expression_t *expression = statement->expression.expression;
9758                 if (!expression_has_effect(expression)) {
9759                         warningf(&expression->base.source_position,
9760                                         "statement has no effect");
9761                 }
9762         }
9763
9764         return statement;
9765 }
9766
9767 /**
9768  * Parse a compound statement.
9769  */
9770 static statement_t *parse_compound_statement(bool inside_expression_statement)
9771 {
9772         statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
9773
9774         PUSH_PARENT(statement);
9775
9776         eat('{');
9777         add_anchor_token('}');
9778
9779         size_t const top       = environment_top();
9780         size_t const top_local = local_label_top();
9781         scope_push(&statement->compound.scope);
9782
9783         statement_t **anchor            = &statement->compound.statements;
9784         bool          only_decls_so_far = true;
9785         while (token.type != '}') {
9786                 if (token.type == T_EOF) {
9787                         errorf(&statement->base.source_position,
9788                                "EOF while parsing compound statement");
9789                         break;
9790                 }
9791                 statement_t *sub_statement = intern_parse_statement();
9792                 if (is_invalid_statement(sub_statement)) {
9793                         /* an error occurred. if we are at an anchor, return */
9794                         if (at_anchor())
9795                                 goto end_error;
9796                         continue;
9797                 }
9798
9799                 if (warning.declaration_after_statement) {
9800                         if (sub_statement->kind != STATEMENT_DECLARATION) {
9801                                 only_decls_so_far = false;
9802                         } else if (!only_decls_so_far) {
9803                                 warningf(&sub_statement->base.source_position,
9804                                          "ISO C90 forbids mixed declarations and code");
9805                         }
9806                 }
9807
9808                 *anchor = sub_statement;
9809
9810                 while (sub_statement->base.next != NULL)
9811                         sub_statement = sub_statement->base.next;
9812
9813                 anchor = &sub_statement->base.next;
9814         }
9815         next_token();
9816
9817         /* look over all statements again to produce no effect warnings */
9818         if (warning.unused_value) {
9819                 statement_t *sub_statement = statement->compound.statements;
9820                 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
9821                         if (sub_statement->kind != STATEMENT_EXPRESSION)
9822                                 continue;
9823                         /* don't emit a warning for the last expression in an expression
9824                          * statement as it has always an effect */
9825                         if (inside_expression_statement && sub_statement->base.next == NULL)
9826                                 continue;
9827
9828                         expression_t *expression = sub_statement->expression.expression;
9829                         if (!expression_has_effect(expression)) {
9830                                 warningf(&expression->base.source_position,
9831                                          "statement has no effect");
9832                         }
9833                 }
9834         }
9835
9836 end_error:
9837         rem_anchor_token('}');
9838         assert(scope == &statement->compound.scope);
9839         scope_pop();
9840         environment_pop_to(top);
9841         local_label_pop_to(top_local);
9842
9843         POP_PARENT;
9844         return statement;
9845 }
9846
9847 /**
9848  * Initialize builtin types.
9849  */
9850 static void initialize_builtin_types(void)
9851 {
9852         type_intmax_t    = make_global_typedef("__intmax_t__",      type_long_long);
9853         type_size_t      = make_global_typedef("__SIZE_TYPE__",     type_unsigned_long);
9854         type_ssize_t     = make_global_typedef("__SSIZE_TYPE__",    type_long);
9855         type_ptrdiff_t   = make_global_typedef("__PTRDIFF_TYPE__",  type_long);
9856         type_uintmax_t   = make_global_typedef("__uintmax_t__",     type_unsigned_long_long);
9857         type_uptrdiff_t  = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
9858         type_wchar_t     = make_global_typedef("__WCHAR_TYPE__",    opt_short_wchar_t ? type_unsigned_short : type_int);
9859         type_wint_t      = make_global_typedef("__WINT_TYPE__",     type_int);
9860
9861         type_intmax_t_ptr  = make_pointer_type(type_intmax_t,  TYPE_QUALIFIER_NONE);
9862         type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
9863         type_ssize_t_ptr   = make_pointer_type(type_ssize_t,   TYPE_QUALIFIER_NONE);
9864         type_wchar_t_ptr   = make_pointer_type(type_wchar_t,   TYPE_QUALIFIER_NONE);
9865
9866         /* const version of wchar_t */
9867         type_const_wchar_t = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
9868         type_const_wchar_t->typedeft.declaration  = type_wchar_t->typedeft.declaration;
9869         type_const_wchar_t->base.qualifiers      |= TYPE_QUALIFIER_CONST;
9870
9871         type_const_wchar_t_ptr = make_pointer_type(type_const_wchar_t, TYPE_QUALIFIER_NONE);
9872 }
9873
9874 /**
9875  * Check for unused global static functions and variables
9876  */
9877 static void check_unused_globals(void)
9878 {
9879         if (!warning.unused_function && !warning.unused_variable)
9880                 return;
9881
9882         for (const declaration_t *decl = file_scope->declarations; decl != NULL; decl = decl->next) {
9883                 if (decl->used                  ||
9884                     decl->modifiers & DM_UNUSED ||
9885                     decl->modifiers & DM_USED   ||
9886                     decl->storage_class != STORAGE_CLASS_STATIC)
9887                         continue;
9888
9889                 type_t *const type = decl->type;
9890                 const char *s;
9891                 if (is_type_function(skip_typeref(type))) {
9892                         if (!warning.unused_function || decl->is_inline)
9893                                 continue;
9894
9895                         s = (decl->init.statement != NULL ? "defined" : "declared");
9896                 } else {
9897                         if (!warning.unused_variable)
9898                                 continue;
9899
9900                         s = "defined";
9901                 }
9902
9903                 warningf(&decl->source_position, "'%#T' %s but not used",
9904                         type, decl->symbol, s);
9905         }
9906 }
9907
9908 static void parse_global_asm(void)
9909 {
9910         statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
9911
9912         eat(T_asm);
9913         expect('(');
9914
9915         statement->asms.asm_text = parse_string_literals();
9916         statement->base.next     = unit->global_asm;
9917         unit->global_asm         = statement;
9918
9919         expect(')');
9920         expect(';');
9921
9922 end_error:;
9923 }
9924
9925 /**
9926  * Parse a translation unit.
9927  */
9928 static void parse_translation_unit(void)
9929 {
9930         add_anchor_token(T_EOF);
9931
9932 #ifndef NDEBUG
9933         unsigned char token_anchor_copy[T_LAST_TOKEN];
9934         memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy));
9935 #endif
9936         for (;;) {
9937 #ifndef NDEBUG
9938                 bool anchor_leak = false;
9939                 for (int i = 0; i != T_LAST_TOKEN; ++i) {
9940                         unsigned char count = token_anchor_set[i] - token_anchor_copy[i];
9941                         if (count != 0) {
9942                                 errorf(HERE, "Leaked anchor token %k %d times", i, count);
9943                                 anchor_leak = true;
9944                         }
9945                 }
9946                 if (in_gcc_extension) {
9947                         errorf(HERE, "Leaked __extension__");
9948                         anchor_leak = true;
9949                 }
9950
9951                 if (anchor_leak)
9952                         abort();
9953 #endif
9954
9955                 switch (token.type) {
9956                         DECLARATION_START
9957                         case T_IDENTIFIER:
9958                         case T___extension__:
9959                                 parse_external_declaration();
9960                                 break;
9961
9962                         case T_asm:
9963                                 parse_global_asm();
9964                                 break;
9965
9966                         case T_EOF:
9967                                 rem_anchor_token(T_EOF);
9968                                 return;
9969
9970                         case ';':
9971                                 if (!strict_mode) {
9972                                         warningf(HERE, "stray ';' outside of function");
9973                                         next_token();
9974                                         break;
9975                                 }
9976                                 /* FALLTHROUGH */
9977
9978                         default:
9979                                 errorf(HERE, "stray %K outside of function", &token);
9980                                 if (token.type == '(' || token.type == '{' || token.type == '[')
9981                                         eat_until_matching_token(token.type);
9982                                 next_token();
9983                                 break;
9984                 }
9985         }
9986 }
9987
9988 /**
9989  * Parse the input.
9990  *
9991  * @return  the translation unit or NULL if errors occurred.
9992  */
9993 void start_parsing(void)
9994 {
9995         environment_stack = NEW_ARR_F(stack_entry_t, 0);
9996         label_stack       = NEW_ARR_F(stack_entry_t, 0);
9997         local_label_stack = NEW_ARR_F(stack_entry_t, 0);
9998         diagnostic_count  = 0;
9999         error_count       = 0;
10000         warning_count     = 0;
10001
10002         type_set_output(stderr);
10003         ast_set_output(stderr);
10004
10005         assert(unit == NULL);
10006         unit = allocate_ast_zero(sizeof(unit[0]));
10007
10008         assert(file_scope == NULL);
10009         file_scope = &unit->scope;
10010
10011         assert(scope == NULL);
10012         scope_push(&unit->scope);
10013
10014         initialize_builtin_types();
10015 }
10016
10017 translation_unit_t *finish_parsing(void)
10018 {
10019         /* do NOT use scope_pop() here, this will crash, will it by hand */
10020         assert(scope == &unit->scope);
10021         scope            = NULL;
10022         last_declaration = NULL;
10023
10024         assert(file_scope == &unit->scope);
10025         check_unused_globals();
10026         file_scope = NULL;
10027
10028         DEL_ARR_F(environment_stack);
10029         DEL_ARR_F(label_stack);
10030         DEL_ARR_F(local_label_stack);
10031
10032         translation_unit_t *result = unit;
10033         unit = NULL;
10034         return result;
10035 }
10036
10037 void parse(void)
10038 {
10039         lookahead_bufpos = 0;
10040         for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
10041                 next_token();
10042         }
10043         parse_translation_unit();
10044 }
10045
10046 /**
10047  * Initialize the parser.
10048  */
10049 void init_parser(void)
10050 {
10051         sym_anonymous = symbol_table_insert("<anonymous>");
10052
10053         if (c_mode & _MS) {
10054                 /* add predefined symbols for extended-decl-modifier */
10055                 sym_align      = symbol_table_insert("align");
10056                 sym_allocate   = symbol_table_insert("allocate");
10057                 sym_dllimport  = symbol_table_insert("dllimport");
10058                 sym_dllexport  = symbol_table_insert("dllexport");
10059                 sym_naked      = symbol_table_insert("naked");
10060                 sym_noinline   = symbol_table_insert("noinline");
10061                 sym_noreturn   = symbol_table_insert("noreturn");
10062                 sym_nothrow    = symbol_table_insert("nothrow");
10063                 sym_novtable   = symbol_table_insert("novtable");
10064                 sym_property   = symbol_table_insert("property");
10065                 sym_get        = symbol_table_insert("get");
10066                 sym_put        = symbol_table_insert("put");
10067                 sym_selectany  = symbol_table_insert("selectany");
10068                 sym_thread     = symbol_table_insert("thread");
10069                 sym_uuid       = symbol_table_insert("uuid");
10070                 sym_deprecated = symbol_table_insert("deprecated");
10071                 sym_restrict   = symbol_table_insert("restrict");
10072                 sym_noalias    = symbol_table_insert("noalias");
10073         }
10074         memset(token_anchor_set, 0, sizeof(token_anchor_set));
10075
10076         init_expression_parsers();
10077         obstack_init(&temp_obst);
10078
10079         symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
10080         type_valist = create_builtin_type(va_list_sym, type_void_ptr);
10081 }
10082
10083 /**
10084  * Terminate the parser.
10085  */
10086 void exit_parser(void)
10087 {
10088         obstack_free(&temp_obst, NULL);
10089 }