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   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 #ifndef AST_T_H
  21 #define AST_T_H
  22
  23 #include <libfirm/firm_types.h>
  24 #include <assert.h>
  25
  26 #include "ast.h"
  27 #include "symbol.h"
  28 #include "token_t.h"
  29 #include "type.h"
  30 #include "entity_t.h"
  31 #include "adt/obst.h"
  32
  33 /** The AST obstack contains all data that must stay in the AST. */
  34 extern struct obstack ast_obstack;
  35
  36 /**
  37  * Operator precedence classes
  38  */
  39 typedef enum precedence_t {
  40         PREC_BOTTOM,
  41         PREC_EXPRESSION,     /* ,                                  left to right */
  42         PREC_ASSIGNMENT,     /* = += -= *= /= %= <<= >>= &= ^= |=  right to left */
  43         PREC_CONDITIONAL,    /* ?:                                 right to left */
  44         PREC_LOGICAL_OR,     /* ||                                 left to right */
  45         PREC_LOGICAL_AND,    /* &&                                 left to right */
  46         PREC_OR,             /* |                                  left to right */
  47         PREC_XOR,            /* ^                                  left to right */
  48         PREC_AND,            /* &                                  left to right */
  49         PREC_EQUALITY,       /* == !=                              left to right */
  50         PREC_RELATIONAL,     /* < <= > >=                          left to right */
  51         PREC_SHIFT,          /* << >>                              left to right */
  52         PREC_ADDITIVE,       /* + -                                left to right */
  53         PREC_MULTIPLICATIVE, /* * / %                              left to right */
  54         PREC_CAST,           /* (type)                             right to left */
  55         PREC_UNARY,          /* ! ~ ++ -- + - * & sizeof           right to left */
  56         PREC_POSTFIX,        /* () [] -> .                         left to right */
  57         PREC_PRIMARY,
  58         PREC_TOP
  59 } precedence_t;
  60
  61 /**
  62  * Expression kinds.
  63  */
  64 typedef enum expression_kind_t {
  65         EXPR_UNKNOWN = 0,
  66         EXPR_INVALID,
  67         EXPR_REFERENCE,
  68         EXPR_REFERENCE_ENUM_VALUE,
  69         EXPR_CONST,
  70         EXPR_CHARACTER_CONSTANT,
  71         EXPR_WIDE_CHARACTER_CONSTANT,
  72         EXPR_STRING_LITERAL,
  73         EXPR_WIDE_STRING_LITERAL,
  74         EXPR_COMPOUND_LITERAL,
  75         EXPR_CALL,
  76         EXPR_CONDITIONAL,
  77         EXPR_SELECT,
  78         EXPR_ARRAY_ACCESS,
  79         EXPR_SIZEOF,
  80         EXPR_CLASSIFY_TYPE,
  81         EXPR_ALIGNOF,
  82
  83         EXPR_FUNCNAME,
  84         EXPR_BUILTIN_CONSTANT_P,
  85         EXPR_BUILTIN_TYPES_COMPATIBLE_P,
  86         EXPR_OFFSETOF,
  87         EXPR_VA_START,
  88         EXPR_VA_ARG,
  89         EXPR_STATEMENT,
  90         EXPR_LABEL_ADDRESS, /**< GCC extension &&label operator */
  91
  92         EXPR_UNARY_FIRST,
  93         EXPR_UNARY_NEGATE = EXPR_UNARY_FIRST,
  94         EXPR_UNARY_PLUS,
  95         EXPR_UNARY_BITWISE_NEGATE,
  96         EXPR_UNARY_NOT,
  97         EXPR_UNARY_DEREFERENCE,
  98         EXPR_UNARY_TAKE_ADDRESS,
  99         EXPR_UNARY_POSTFIX_INCREMENT,
 100         EXPR_UNARY_POSTFIX_DECREMENT,
 101         EXPR_UNARY_PREFIX_INCREMENT,
 102         EXPR_UNARY_PREFIX_DECREMENT,
 103         EXPR_UNARY_CAST,
 104         EXPR_UNARY_CAST_IMPLICIT, /**< compiler generated cast */
 105         EXPR_UNARY_ASSUME,        /**< MS __assume() */
 106         EXPR_UNARY_DELETE,
 107         EXPR_UNARY_DELETE_ARRAY,
 108         EXPR_UNARY_THROW,
 109         EXPR_UNARY_LAST = EXPR_UNARY_THROW,
 110
 111         EXPR_BINARY_FIRST,
 112         EXPR_BINARY_ADD = EXPR_BINARY_FIRST,
 113         EXPR_BINARY_SUB,
 114         EXPR_BINARY_MUL,
 115         EXPR_BINARY_DIV,
 116         EXPR_BINARY_MOD,
 117         EXPR_BINARY_EQUAL,
 118         EXPR_BINARY_NOTEQUAL,
 119         EXPR_BINARY_LESS,
 120         EXPR_BINARY_LESSEQUAL,
 121         EXPR_BINARY_GREATER,
 122         EXPR_BINARY_GREATEREQUAL,
 123         EXPR_BINARY_BITWISE_AND,
 124         EXPR_BINARY_BITWISE_OR,
 125         EXPR_BINARY_BITWISE_XOR,
 126         EXPR_BINARY_LOGICAL_AND,
 127         EXPR_BINARY_LOGICAL_OR,
 128         EXPR_BINARY_SHIFTLEFT,
 129         EXPR_BINARY_SHIFTRIGHT,
 130         EXPR_BINARY_ASSIGN,
 131         EXPR_BINARY_MUL_ASSIGN,
 132         EXPR_BINARY_DIV_ASSIGN,
 133         EXPR_BINARY_MOD_ASSIGN,
 134         EXPR_BINARY_ADD_ASSIGN,
 135         EXPR_BINARY_SUB_ASSIGN,
 136         EXPR_BINARY_SHIFTLEFT_ASSIGN,
 137         EXPR_BINARY_SHIFTRIGHT_ASSIGN,
 138         EXPR_BINARY_BITWISE_AND_ASSIGN,
 139         EXPR_BINARY_BITWISE_XOR_ASSIGN,
 140         EXPR_BINARY_BITWISE_OR_ASSIGN,
 141         EXPR_BINARY_COMMA,
 142
 143         EXPR_BINARY_ISGREATER,
 144         EXPR_BINARY_ISGREATEREQUAL,
 145         EXPR_BINARY_ISLESS,
 146         EXPR_BINARY_ISLESSEQUAL,
 147         EXPR_BINARY_ISLESSGREATER,
 148         EXPR_BINARY_ISUNORDERED,
 149         EXPR_BINARY_LAST = EXPR_BINARY_ISUNORDERED,
 150 } expression_kind_t;
 151
 152 typedef enum funcname_kind_t {
 153         FUNCNAME_FUNCTION,           /**< C99 __func__, older __FUNCTION__ */
 154         FUNCNAME_PRETTY_FUNCTION,    /**< GNUC __PRETTY_FUNCTION__ */
 155         FUNCNAME_FUNCSIG,            /**< MS __FUNCSIG__ */
 156         FUNCNAME_FUNCDNAME           /**< MS __FUNCDNAME__ */
 157 } funcname_kind_t;
 158
 159 /* convenience macros */
 160 #define EXPR_BINARY_CASES                  \
 161         case EXPR_BINARY_ADD:                  \
 162         case EXPR_BINARY_SUB:                  \
 163         case EXPR_BINARY_MUL:                  \
 164         case EXPR_BINARY_DIV:                  \
 165         case EXPR_BINARY_MOD:                  \
 166         case EXPR_BINARY_EQUAL:                \
 167         case EXPR_BINARY_NOTEQUAL:             \
 168         case EXPR_BINARY_LESS:                 \
 169         case EXPR_BINARY_LESSEQUAL:            \
 170         case EXPR_BINARY_GREATER:              \
 171         case EXPR_BINARY_GREATEREQUAL:         \
 172         case EXPR_BINARY_BITWISE_AND:          \
 173         case EXPR_BINARY_BITWISE_OR:           \
 174         case EXPR_BINARY_BITWISE_XOR:          \
 175         case EXPR_BINARY_LOGICAL_AND:          \
 176         case EXPR_BINARY_LOGICAL_OR:           \
 177         case EXPR_BINARY_SHIFTLEFT:            \
 178         case EXPR_BINARY_SHIFTRIGHT:           \
 179         case EXPR_BINARY_ASSIGN:               \
 180         case EXPR_BINARY_MUL_ASSIGN:           \
 181         case EXPR_BINARY_DIV_ASSIGN:           \
 182         case EXPR_BINARY_MOD_ASSIGN:           \
 183         case EXPR_BINARY_ADD_ASSIGN:           \
 184         case EXPR_BINARY_SUB_ASSIGN:           \
 185         case EXPR_BINARY_SHIFTLEFT_ASSIGN:     \
 186         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:    \
 187         case EXPR_BINARY_BITWISE_AND_ASSIGN:   \
 188         case EXPR_BINARY_BITWISE_XOR_ASSIGN:   \
 189         case EXPR_BINARY_BITWISE_OR_ASSIGN:    \
 190         case EXPR_BINARY_COMMA:                \
 191         case EXPR_BINARY_ISGREATER:            \
 192         case EXPR_BINARY_ISGREATEREQUAL:       \
 193         case EXPR_BINARY_ISLESS:               \
 194         case EXPR_BINARY_ISLESSEQUAL:          \
 195         case EXPR_BINARY_ISLESSGREATER:        \
 196         case EXPR_BINARY_ISUNORDERED:
 197
 198 /**
 199  * unary expression with mandatory operand
 200  */
 201 #define EXPR_UNARY_CASES_MANDATORY         \
 202         case EXPR_UNARY_NEGATE:                \
 203         case EXPR_UNARY_PLUS:                  \
 204         case EXPR_UNARY_BITWISE_NEGATE:        \
 205         case EXPR_UNARY_NOT:                   \
 206         case EXPR_UNARY_DEREFERENCE:           \
 207         case EXPR_UNARY_TAKE_ADDRESS:          \
 208         case EXPR_UNARY_POSTFIX_INCREMENT:     \
 209         case EXPR_UNARY_POSTFIX_DECREMENT:     \
 210         case EXPR_UNARY_PREFIX_INCREMENT:      \
 211         case EXPR_UNARY_PREFIX_DECREMENT:      \
 212         case EXPR_UNARY_CAST:                  \
 213         case EXPR_UNARY_CAST_IMPLICIT:         \
 214         case EXPR_UNARY_ASSUME:                \
 215         case EXPR_UNARY_DELETE:                \
 216         case EXPR_UNARY_DELETE_ARRAY:
 217
 218 /**
 219  * unary expression with optional operand
 220  */
 221 #define EXPR_UNARY_CASES_OPTIONAL \
 222         case EXPR_UNARY_THROW:        \
 223
 224 #define EXPR_UNARY_CASES       \
 225         EXPR_UNARY_CASES_MANDATORY \
 226         EXPR_UNARY_CASES_OPTIONAL
 227
 228 /**
 229  * The base class of every expression.
 230  */
 231 struct expression_base_t {
 232         expression_kind_t   kind;            /**< The expression kind. */
 233         type_t             *type;            /**< The type of the expression. */
 234         source_position_t   source_position; /**< The source position of this expression. */
 235         bool                parenthesized;
 236 #ifndef NDEBUG
 237         bool                transformed;     /**< Set if this expression was transformed. */
 238 #endif
 239 };
 240
 241 struct const_expression_t {
 242         expression_base_t  base;
 243         union {
 244                 long long      int_value;
 245                 long double    float_value;
 246                 string_t       character;
 247                 wide_string_t  wide_character;
 248         } v;
 249         bool               is_ms_noop;  /**< True, if this constant is the result
 250                                              of an microsoft __noop operator */
 251 };
 252
 253 struct string_literal_expression_t {
 254         expression_base_t  base;
 255         string_t           value;
 256 };
 257
 258 struct funcname_expression_t {
 259         expression_base_t  base;
 260         funcname_kind_t    kind;
 261         string_t           value;     /**< the value once assigned. */
 262 };
 263
 264 struct wide_string_literal_expression_t {
 265         expression_base_t  base;
 266         wide_string_t      value;
 267 };
 268
 269 struct compound_literal_expression_t {
 270         expression_base_t  base;
 271         type_t            *type;
 272         initializer_t     *initializer;
 273 };
 274
 275 struct builtin_constant_expression_t {
 276         expression_base_t  base;
 277         expression_t      *value;
 278 };
 279
 280 struct builtin_types_compatible_expression_t {
 281         expression_base_t  base;
 282         type_t            *left;
 283         type_t            *right;
 284 };
 285
 286 struct reference_expression_t {
 287         expression_base_t  base;
 288         entity_t          *entity;
 289 };
 290
 291 struct call_argument_t {
 292         expression_t    *expression;
 293         call_argument_t *next;
 294 };
 295
 296 struct call_expression_t {
 297         expression_base_t  base;
 298         expression_t      *function;
 299         call_argument_t   *arguments;
 300 };
 301
 302 struct unary_expression_t {
 303         expression_base_t  base;
 304         expression_t      *value;
 305 };
 306
 307 struct binary_expression_t {
 308         expression_base_t  base;
 309         expression_t      *left;
 310         expression_t      *right;
 311 };
 312
 313 struct select_expression_t {
 314         expression_base_t  base;
 315         expression_t      *compound;
 316         entity_t          *compound_entry;
 317 };
 318
 319 struct array_access_expression_t {
 320         expression_base_t  base;
 321         expression_t      *array_ref;
 322         expression_t      *index;
 323         bool               flipped; /**< index/ref was written in a 5[a] way */
 324 };
 325
 326 struct typeprop_expression_t {
 327         expression_base_t  base;
 328         type_t            *type;
 329         expression_t      *tp_expression;
 330 };
 331
 332 struct designator_t {
 333         source_position_t  source_position;
 334         symbol_t          *symbol;
 335         expression_t      *array_index;
 336         designator_t      *next;
 337 };
 338
 339 struct offsetof_expression_t {
 340         expression_base_t  base;
 341         type_t            *type;
 342         designator_t      *designator;
 343 };
 344
 345 struct va_start_expression_t {
 346         expression_base_t  base;
 347         expression_t      *ap;
 348         variable_t        *parameter;
 349 };
 350
 351 struct va_arg_expression_t {
 352         expression_base_t  base;
 353         expression_t      *ap;
 354 };
 355
 356 struct conditional_expression_t {
 357         expression_base_t  base;
 358         expression_t      *condition;
 359         expression_t      *true_expression;
 360         expression_t      *false_expression;
 361 };
 362
 363 struct statement_expression_t {
 364         expression_base_t  base;
 365         statement_t       *statement;
 366 };
 367
 368 struct classify_type_expression_t {
 369         expression_base_t  base;
 370         expression_t      *type_expression;
 371 };
 372
 373 struct label_address_expression_t {
 374         expression_base_t  base;
 375         label_t           *label;
 376 };
 377
 378 union expression_t {
 379         expression_kind_t                     kind;
 380         expression_base_t                     base;
 381         const_expression_t                    conste;
 382         funcname_expression_t                 funcname;
 383         string_literal_expression_t           string;
 384         wide_string_literal_expression_t      wide_string;
 385         compound_literal_expression_t         compound_literal;
 386         builtin_constant_expression_t         builtin_constant;
 387         builtin_types_compatible_expression_t builtin_types_compatible;
 388         reference_expression_t                reference;
 389         call_expression_t                     call;
 390         unary_expression_t                    unary;
 391         binary_expression_t                   binary;
 392         select_expression_t                   select;
 393         array_access_expression_t             array_access;
 394         typeprop_expression_t                 typeprop;
 395         offsetof_expression_t                 offsetofe;
 396         va_start_expression_t                 va_starte;
 397         va_arg_expression_t                   va_arge;
 398         conditional_expression_t              conditional;
 399         statement_expression_t                statement;
 400         classify_type_expression_t            classify_type;
 401         label_address_expression_t            label_address;
 402 };
 403
 404 typedef enum initializer_kind_t {
 405         INITIALIZER_VALUE,
 406         INITIALIZER_LIST,
 407         INITIALIZER_STRING,
 408         INITIALIZER_WIDE_STRING,
 409         INITIALIZER_DESIGNATOR
 410 } initializer_kind_t;
 411
 412 struct initializer_base_t {
 413         initializer_kind_t kind;
 414 };
 415
 416 struct initializer_value_t {
 417         initializer_base_t  base;
 418         expression_t       *value;
 419 };
 420
 421 struct initializer_list_t {
 422         initializer_base_t  base;
 423         size_t              len;
 424         initializer_t      *initializers[];
 425 };
 426
 427 struct initializer_string_t {
 428         initializer_base_t base;
 429         string_t           string;
 430 };
 431
 432 struct initializer_wide_string_t {
 433         initializer_base_t  base;
 434         wide_string_t       string;
 435 };
 436
 437 struct initializer_designator_t {
 438         initializer_base_t  base;
 439         designator_t       *designator;
 440 };
 441
 442 union initializer_t {
 443         initializer_kind_t        kind;
 444         initializer_base_t        base;
 445         initializer_value_t       value;
 446         initializer_list_t        list;
 447         initializer_string_t      string;
 448         initializer_wide_string_t wide_string;
 449         initializer_designator_t  designator;
 450 };
 451
 452 /**
 453  * GNU attributes.
 454  */
 455 typedef enum gnu_attribute_kind_t {
 456         GNU_AK_CONST,
 457         GNU_AK_VOLATILE,
 458         GNU_AK_CDECL,
 459         GNU_AK_STDCALL,
 460         GNU_AK_FASTCALL,
 461         GNU_AK_DEPRECATED,
 462         GNU_AK_NOINLINE,
 463         GNU_AK_RETURNS_TWICE,
 464         GNU_AK_NORETURN,
 465         GNU_AK_NAKED,
 466         GNU_AK_PURE,
 467         GNU_AK_ALWAYS_INLINE,
 468         GNU_AK_MALLOC,
 469         GNU_AK_WEAK,
 470         GNU_AK_CONSTRUCTOR,
 471         GNU_AK_DESTRUCTOR,
 472         GNU_AK_NOTHROW,
 473         GNU_AK_TRANSPARENT_UNION,
 474         GNU_AK_COMMON,
 475         GNU_AK_NOCOMMON,
 476         GNU_AK_PACKED,
 477         GNU_AK_SHARED,
 478         GNU_AK_NOTSHARED,
 479         GNU_AK_USED,
 480         GNU_AK_UNUSED,
 481         GNU_AK_NO_INSTRUMENT_FUNCTION,
 482         GNU_AK_WARN_UNUSED_RESULT,
 483         GNU_AK_LONGCALL,
 484         GNU_AK_SHORTCALL,
 485         GNU_AK_LONG_CALL,
 486         GNU_AK_SHORT_CALL,
 487         GNU_AK_FUNCTION_VECTOR,
 488         GNU_AK_INTERRUPT,
 489         GNU_AK_INTERRUPT_HANDLER,
 490         GNU_AK_NMI_HANDLER,
 491         GNU_AK_NESTING,
 492         GNU_AK_NEAR,
 493         GNU_AK_FAR,
 494         GNU_AK_SIGNAL,
 495         GNU_AK_EIGTHBIT_DATA,
 496         GNU_AK_TINY_DATA,
 497         GNU_AK_SAVEALL,
 498         GNU_AK_FLATTEN,
 499         GNU_AK_SSEREGPARM,
 500         GNU_AK_EXTERNALLY_VISIBLE,
 501         GNU_AK_RETURN_TWICE,
 502         GNU_AK_MAY_ALIAS,
 503         GNU_AK_MS_STRUCT,
 504         GNU_AK_GCC_STRUCT,
 505         GNU_AK_DLLIMPORT,
 506         GNU_AK_DLLEXPORT,
 507         GNU_AK_ALIGNED,
 508         GNU_AK_ALIAS,
 509         GNU_AK_SECTION,
 510         GNU_AK_FORMAT,
 511         GNU_AK_FORMAT_ARG,
 512         GNU_AK_WEAKREF,
 513         GNU_AK_NONNULL,
 514         GNU_AK_TLS_MODEL,
 515         GNU_AK_VISIBILITY,
 516         GNU_AK_REGPARM,
 517         GNU_AK_MODEL,
 518         GNU_AK_MODE,
 519         GNU_AK_TRAP_EXIT,
 520         GNU_AK_SP_SWITCH,
 521         GNU_AK_SENTINEL,
 522         GNU_AK_LAST
 523 } gnu_attribute_kind_t;
 524
 525 /**
 526  * The statement kinds.
 527  */
 528 typedef enum statement_kind_t {
 529         STATEMENT_INVALID,
 530         STATEMENT_EMPTY,
 531         STATEMENT_COMPOUND,
 532         STATEMENT_RETURN,
 533         STATEMENT_DECLARATION,
 534         STATEMENT_IF,
 535         STATEMENT_SWITCH,
 536         STATEMENT_EXPRESSION,
 537         STATEMENT_CONTINUE,
 538         STATEMENT_BREAK,
 539         STATEMENT_GOTO,
 540         STATEMENT_LABEL,
 541         STATEMENT_CASE_LABEL,
 542         STATEMENT_WHILE,
 543         STATEMENT_DO_WHILE,
 544         STATEMENT_FOR,
 545         STATEMENT_ASM,
 546         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 547         STATEMENT_LEAVE            /**< MS __leave */
 548 } statement_kind_t;
 549
 550 /**
 551  * The base class of every statement.
 552  */
 553 struct statement_base_t {
 554         statement_kind_t   kind;
 555         statement_t       *next;
 556         source_position_t  source_position;
 557         statement_t       *parent;
 558         bool               reachable;
 559 #ifndef NDEBUG
 560         bool               transformed;
 561 #endif
 562 };
 563
 564 struct invalid_statement_t {
 565         statement_base_t  base;
 566 };
 567
 568 struct empty_statement_t {
 569         statement_base_t  base;
 570 };
 571
 572 struct return_statement_t {
 573         statement_base_t  base;
 574         expression_t     *value;
 575 };
 576
 577 struct compound_statement_t {
 578         statement_base_t  base;
 579         statement_t      *statements;
 580         scope_t           scope;
 581         bool              stmt_expr; /* The compound statement is a statement expression */
 582 };
 583
 584 struct declaration_statement_t {
 585         statement_base_t  base;
 586         entity_t         *declarations_begin;
 587         entity_t         *declarations_end;
 588 };
 589
 590 struct if_statement_t {
 591         statement_base_t  base;
 592         expression_t     *condition;
 593         statement_t      *true_statement;
 594         statement_t      *false_statement;
 595 };
 596
 597 struct switch_statement_t {
 598         statement_base_t        base;
 599         expression_t           *expression;
 600         statement_t            *body;
 601         case_label_statement_t *first_case, *last_case;  /**< List of all cases, including default. */
 602         case_label_statement_t *default_label;           /**< The default label if existent. */
 603         unsigned long           default_proj_nr;         /**< The Proj-number for the default Proj. */
 604 };
 605
 606 struct goto_statement_t {
 607         statement_base_t  base;
 608         label_t          *label;         /**< The destination label. */
 609         expression_t     *expression;    /**< The expression for an assigned goto. */
 610         goto_statement_t *next;          /**< links all goto statements of a function */
 611 };
 612
 613 struct case_label_statement_t {
 614         statement_base_t        base;
 615         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 616         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 617         case_label_statement_t *next;          /**< link to the next case label in switch */
 618         statement_t            *statement;
 619         long                   first_case;     /**< The folded value of expression. */
 620         long                   last_case;      /**< The folded value of end_range. */
 621         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 622         bool                   is_empty_range; /**< If set marked this as an empty range. */
 623 };
 624
 625 struct label_statement_t {
 626         statement_base_t   base;
 627         label_t           *label;
 628         statement_t       *statement;
 629         label_statement_t *next;    /**< links all label statements of a function */
 630 };
 631
 632 struct expression_statement_t {
 633         statement_base_t  base;
 634         expression_t     *expression;
 635 };
 636
 637 struct while_statement_t {
 638         statement_base_t  base;
 639         expression_t     *condition;
 640         statement_t      *body;
 641 };
 642
 643 struct do_while_statement_t {
 644         statement_base_t  base;
 645         expression_t     *condition;
 646         statement_t      *body;
 647 };
 648
 649 struct for_statement_t {
 650         statement_base_t  base;
 651         expression_t     *initialisation;
 652         expression_t     *condition;
 653         expression_t     *step;
 654         statement_t      *body;
 655         scope_t           scope;
 656         bool              condition_reachable:1;
 657         bool              step_reachable:1;
 658 };
 659
 660 struct asm_argument_t {
 661         string_t        constraints;
 662         expression_t   *expression;
 663         symbol_t       *symbol;
 664         asm_argument_t *next;
 665 };
 666
 667 struct asm_clobber_t {
 668         string_t       clobber;
 669         asm_clobber_t *next;
 670 };
 671
 672 struct asm_statement_t {
 673         statement_base_t base;
 674         string_t         asm_text;
 675         asm_argument_t  *inputs;
 676         asm_argument_t  *outputs;
 677         asm_clobber_t   *clobbers;
 678         bool             is_volatile;
 679 };
 680
 681 struct ms_try_statement_t {
 682         statement_base_t  base;
 683         statement_t      *try_statement;
 684         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 685         statement_t      *final_statement;
 686 };
 687
 688 struct leave_statement_t {
 689         statement_base_t  base;
 690 };
 691
 692 union statement_t {
 693         statement_kind_t         kind;
 694         statement_base_t         base;
 695         return_statement_t       returns;
 696         compound_statement_t     compound;
 697         declaration_statement_t  declaration;
 698         if_statement_t           ifs;
 699         switch_statement_t       switchs;
 700         goto_statement_t         gotos;
 701         case_label_statement_t   case_label;
 702         label_statement_t        label;
 703         expression_statement_t   expression;
 704         while_statement_t        whiles;
 705         do_while_statement_t     do_while;
 706         for_statement_t          fors;
 707         asm_statement_t          asms;
 708         ms_try_statement_t       ms_try;
 709         leave_statement_t        leave;
 710 };
 711
 712 struct translation_unit_t {
 713         scope_t      scope;
 714         statement_t *global_asm;
 715 };
 716
 717 static inline
 718 void *_allocate_ast(size_t size)
 719 {
 720         return obstack_alloc(&ast_obstack, size);
 721 }
 722
 723 static inline
 724 bool is_invalid_expression(expression_t *expression)
 725 {
 726         return expression->base.kind == EXPR_INVALID;
 727 }
 728
 729 static inline
 730 bool is_invalid_statement(statement_t *statement)
 731 {
 732         return statement->base.kind == STATEMENT_INVALID;
 733 }
 734
 735
 736 #define allocate_ast(size)                 _allocate_ast(size)
 737
 738 #endif