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   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #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_VA_COPY,
  90         EXPR_STATEMENT,
  91         EXPR_LABEL_ADDRESS, /**< GCC extension &&label operator */
  92
  93         EXPR_UNARY_FIRST,
  94         EXPR_UNARY_NEGATE = EXPR_UNARY_FIRST,
  95         EXPR_UNARY_PLUS,
  96         EXPR_UNARY_BITWISE_NEGATE,
  97         EXPR_UNARY_NOT,
  98         EXPR_UNARY_DEREFERENCE,
  99         EXPR_UNARY_TAKE_ADDRESS,
 100         EXPR_UNARY_POSTFIX_INCREMENT,
 101         EXPR_UNARY_POSTFIX_DECREMENT,
 102         EXPR_UNARY_PREFIX_INCREMENT,
 103         EXPR_UNARY_PREFIX_DECREMENT,
 104         EXPR_UNARY_CAST,
 105         EXPR_UNARY_CAST_IMPLICIT, /**< compiler generated cast */
 106         EXPR_UNARY_ASSUME,        /**< MS __assume() */
 107         EXPR_UNARY_DELETE,
 108         EXPR_UNARY_DELETE_ARRAY,
 109         EXPR_UNARY_THROW,
 110         EXPR_UNARY_LAST = EXPR_UNARY_THROW,
 111
 112         EXPR_BINARY_FIRST,
 113         EXPR_BINARY_ADD = EXPR_BINARY_FIRST,
 114         EXPR_BINARY_SUB,
 115         EXPR_BINARY_MUL,
 116         EXPR_BINARY_DIV,
 117         EXPR_BINARY_MOD,
 118         EXPR_BINARY_EQUAL,
 119         EXPR_BINARY_NOTEQUAL,
 120         EXPR_BINARY_LESS,
 121         EXPR_BINARY_LESSEQUAL,
 122         EXPR_BINARY_GREATER,
 123         EXPR_BINARY_GREATEREQUAL,
 124         EXPR_BINARY_BITWISE_AND,
 125         EXPR_BINARY_BITWISE_OR,
 126         EXPR_BINARY_BITWISE_XOR,
 127         EXPR_BINARY_LOGICAL_AND,
 128         EXPR_BINARY_LOGICAL_OR,
 129         EXPR_BINARY_SHIFTLEFT,
 130         EXPR_BINARY_SHIFTRIGHT,
 131         EXPR_BINARY_ASSIGN,
 132         EXPR_BINARY_MUL_ASSIGN,
 133         EXPR_BINARY_DIV_ASSIGN,
 134         EXPR_BINARY_MOD_ASSIGN,
 135         EXPR_BINARY_ADD_ASSIGN,
 136         EXPR_BINARY_SUB_ASSIGN,
 137         EXPR_BINARY_SHIFTLEFT_ASSIGN,
 138         EXPR_BINARY_SHIFTRIGHT_ASSIGN,
 139         EXPR_BINARY_BITWISE_AND_ASSIGN,
 140         EXPR_BINARY_BITWISE_XOR_ASSIGN,
 141         EXPR_BINARY_BITWISE_OR_ASSIGN,
 142         EXPR_BINARY_COMMA,
 143
 144         EXPR_BINARY_ISGREATER,
 145         EXPR_BINARY_ISGREATEREQUAL,
 146         EXPR_BINARY_ISLESS,
 147         EXPR_BINARY_ISLESSEQUAL,
 148         EXPR_BINARY_ISLESSGREATER,
 149         EXPR_BINARY_ISUNORDERED,
 150         EXPR_BINARY_LAST = EXPR_BINARY_ISUNORDERED,
 151 } expression_kind_t;
 152
 153 typedef enum funcname_kind_t {
 154         FUNCNAME_FUNCTION,           /**< C99 __func__, older __FUNCTION__ */
 155         FUNCNAME_PRETTY_FUNCTION,    /**< GNUC __PRETTY_FUNCTION__ */
 156         FUNCNAME_FUNCSIG,            /**< MS __FUNCSIG__ */
 157         FUNCNAME_FUNCDNAME           /**< MS __FUNCDNAME__ */
 158 } funcname_kind_t;
 159
 160 /* convenience macros */
 161 #define EXPR_BINARY_CASES                  \
 162         case EXPR_BINARY_ADD:                  \
 163         case EXPR_BINARY_SUB:                  \
 164         case EXPR_BINARY_MUL:                  \
 165         case EXPR_BINARY_DIV:                  \
 166         case EXPR_BINARY_MOD:                  \
 167         case EXPR_BINARY_EQUAL:                \
 168         case EXPR_BINARY_NOTEQUAL:             \
 169         case EXPR_BINARY_LESS:                 \
 170         case EXPR_BINARY_LESSEQUAL:            \
 171         case EXPR_BINARY_GREATER:              \
 172         case EXPR_BINARY_GREATEREQUAL:         \
 173         case EXPR_BINARY_BITWISE_AND:          \
 174         case EXPR_BINARY_BITWISE_OR:           \
 175         case EXPR_BINARY_BITWISE_XOR:          \
 176         case EXPR_BINARY_LOGICAL_AND:          \
 177         case EXPR_BINARY_LOGICAL_OR:           \
 178         case EXPR_BINARY_SHIFTLEFT:            \
 179         case EXPR_BINARY_SHIFTRIGHT:           \
 180         case EXPR_BINARY_ASSIGN:               \
 181         case EXPR_BINARY_MUL_ASSIGN:           \
 182         case EXPR_BINARY_DIV_ASSIGN:           \
 183         case EXPR_BINARY_MOD_ASSIGN:           \
 184         case EXPR_BINARY_ADD_ASSIGN:           \
 185         case EXPR_BINARY_SUB_ASSIGN:           \
 186         case EXPR_BINARY_SHIFTLEFT_ASSIGN:     \
 187         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:    \
 188         case EXPR_BINARY_BITWISE_AND_ASSIGN:   \
 189         case EXPR_BINARY_BITWISE_XOR_ASSIGN:   \
 190         case EXPR_BINARY_BITWISE_OR_ASSIGN:    \
 191         case EXPR_BINARY_COMMA:                \
 192         case EXPR_BINARY_ISGREATER:            \
 193         case EXPR_BINARY_ISGREATEREQUAL:       \
 194         case EXPR_BINARY_ISLESS:               \
 195         case EXPR_BINARY_ISLESSEQUAL:          \
 196         case EXPR_BINARY_ISLESSGREATER:        \
 197         case EXPR_BINARY_ISUNORDERED:
 198
 199 /**
 200  * unary expression with mandatory operand
 201  */
 202 #define EXPR_UNARY_CASES_MANDATORY         \
 203         case EXPR_UNARY_NEGATE:                \
 204         case EXPR_UNARY_PLUS:                  \
 205         case EXPR_UNARY_BITWISE_NEGATE:        \
 206         case EXPR_UNARY_NOT:                   \
 207         case EXPR_UNARY_DEREFERENCE:           \
 208         case EXPR_UNARY_TAKE_ADDRESS:          \
 209         case EXPR_UNARY_POSTFIX_INCREMENT:     \
 210         case EXPR_UNARY_POSTFIX_DECREMENT:     \
 211         case EXPR_UNARY_PREFIX_INCREMENT:      \
 212         case EXPR_UNARY_PREFIX_DECREMENT:      \
 213         case EXPR_UNARY_CAST:                  \
 214         case EXPR_UNARY_CAST_IMPLICIT:         \
 215         case EXPR_UNARY_ASSUME:                \
 216         case EXPR_UNARY_DELETE:                \
 217         case EXPR_UNARY_DELETE_ARRAY:
 218
 219 /**
 220  * unary expression with optional operand
 221  */
 222 #define EXPR_UNARY_CASES_OPTIONAL \
 223         case EXPR_UNARY_THROW:        \
 224
 225 #define EXPR_UNARY_CASES       \
 226         EXPR_UNARY_CASES_MANDATORY \
 227         EXPR_UNARY_CASES_OPTIONAL
 228
 229 /**
 230  * The base class of every expression.
 231  */
 232 struct expression_base_t {
 233         expression_kind_t   kind;            /**< The expression kind. */
 234         type_t             *type;            /**< The type of the expression. */
 235         source_position_t   source_position; /**< The source position of this expression. */
 236         bool                parenthesized : 1;
 237 #ifndef NDEBUG
 238         bool                transformed : 1;     /**< Set if this expression was transformed. */
 239 #endif
 240 };
 241
 242 /**
 243  * A constant.
 244  */
 245 struct const_expression_t {
 246         expression_base_t  base;
 247         union {
 248                 long long      int_value;
 249                 long double    float_value;
 250                 string_t       character;
 251                 wide_string_t  wide_character;
 252         } v;
 253         bool               is_ms_noop;  /**< True, if this constant is the result
 254                                              of an microsoft __noop operator */
 255 };
 256
 257 struct string_literal_expression_t {
 258         expression_base_t  base;
 259         string_t           value;
 260 };
 261
 262 struct funcname_expression_t {
 263         expression_base_t  base;
 264         funcname_kind_t    kind;
 265         string_t           value;     /**< the value once assigned. */
 266 };
 267
 268 struct wide_string_literal_expression_t {
 269         expression_base_t  base;
 270         wide_string_t      value;
 271 };
 272
 273 struct compound_literal_expression_t {
 274         expression_base_t  base;
 275         type_t            *type;
 276         initializer_t     *initializer;
 277 };
 278
 279 struct builtin_constant_expression_t {
 280         expression_base_t  base;
 281         expression_t      *value;
 282 };
 283
 284 struct builtin_types_compatible_expression_t {
 285         expression_base_t  base;
 286         type_t            *left;
 287         type_t            *right;
 288 };
 289
 290 struct reference_expression_t {
 291         expression_base_t  base;
 292         entity_t          *entity;
 293 };
 294
 295 /**
 296  * An argument of a call.
 297  */
 298 struct call_argument_t {
 299         expression_t    *expression;  /**< The expression which value is transmitted. */
 300         call_argument_t *next;        /**< Links to the next argument of this call. */
 301 };
 302
 303
 304 struct call_expression_t {
 305         expression_base_t  base;
 306         expression_t      *function;  /**< The address of the function to call. */
 307         call_argument_t   *arguments; /**< List of arguments of this call. */
 308 };
 309
 310
 311 struct unary_expression_t {
 312         expression_base_t  base;
 313         expression_t      *value;     /**< The unary operand. */
 314 };
 315
 316 struct binary_expression_t {
 317         expression_base_t  base;
 318         expression_t      *left;
 319         expression_t      *right;
 320 };
 321
 322 struct select_expression_t {
 323         expression_base_t  base;
 324         expression_t      *compound;
 325         entity_t          *compound_entry;
 326         bool               implicit : 1; /**< compiler generated select
 327                                               (for anonymous struct/union) */
 328 };
 329
 330 struct array_access_expression_t {
 331         expression_base_t  base;
 332         expression_t      *array_ref; /**< the referenced array */
 333         expression_t      *index;     /**< the index used */
 334         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 335 };
 336
 337 struct typeprop_expression_t {
 338         expression_base_t  base;
 339         type_t            *type;
 340         expression_t      *tp_expression;
 341 };
 342
 343 struct designator_t {
 344         source_position_t  source_position;
 345         symbol_t          *symbol;      /**< the symbol if any */
 346         expression_t      *array_index; /**< the array index if any */
 347         designator_t      *next;
 348 };
 349
 350 struct offsetof_expression_t {
 351         expression_base_t  base;
 352         type_t            *type;
 353         designator_t      *designator;
 354 };
 355
 356 struct va_start_expression_t {
 357         expression_base_t  base;
 358         expression_t      *ap;
 359         variable_t        *parameter;
 360 };
 361
 362 struct va_arg_expression_t {
 363         expression_base_t  base;
 364         expression_t      *ap;
 365 };
 366
 367 struct va_copy_expression_t {
 368         expression_base_t  base;
 369         expression_t      *dst;    /**< destination argument */
 370         expression_t      *src;    /**< source argument */
 371 };
 372
 373 struct conditional_expression_t {
 374         expression_base_t  base;
 375         expression_t      *condition;
 376         expression_t      *true_expression;
 377         expression_t      *false_expression;
 378 };
 379
 380 struct statement_expression_t {
 381         expression_base_t  base;
 382         statement_t       *statement;
 383 };
 384
 385 struct classify_type_expression_t {
 386         expression_base_t  base;
 387         expression_t      *type_expression;
 388 };
 389
 390 struct label_address_expression_t {
 391         expression_base_t  base;
 392         label_t           *label;
 393 };
 394
 395 union expression_t {
 396         expression_kind_t                     kind;
 397         expression_base_t                     base;
 398         const_expression_t                    conste;
 399         funcname_expression_t                 funcname;
 400         string_literal_expression_t           string;
 401         wide_string_literal_expression_t      wide_string;
 402         compound_literal_expression_t         compound_literal;
 403         builtin_constant_expression_t         builtin_constant;
 404         builtin_types_compatible_expression_t builtin_types_compatible;
 405         reference_expression_t                reference;
 406         call_expression_t                     call;
 407         unary_expression_t                    unary;
 408         binary_expression_t                   binary;
 409         select_expression_t                   select;
 410         array_access_expression_t             array_access;
 411         typeprop_expression_t                 typeprop;
 412         offsetof_expression_t                 offsetofe;
 413         va_start_expression_t                 va_starte;
 414         va_arg_expression_t                   va_arge;
 415         va_copy_expression_t                  va_copye;
 416         conditional_expression_t              conditional;
 417         statement_expression_t                statement;
 418         classify_type_expression_t            classify_type;
 419         label_address_expression_t            label_address;
 420 };
 421
 422 typedef enum initializer_kind_t {
 423         INITIALIZER_VALUE,
 424         INITIALIZER_LIST,
 425         INITIALIZER_STRING,
 426         INITIALIZER_WIDE_STRING,
 427         INITIALIZER_DESIGNATOR
 428 } initializer_kind_t;
 429
 430 struct initializer_base_t {
 431         initializer_kind_t kind;
 432 };
 433
 434 struct initializer_value_t {
 435         initializer_base_t  base;
 436         expression_t       *value;
 437 };
 438
 439 struct initializer_list_t {
 440         initializer_base_t  base;
 441         size_t              len;
 442         initializer_t      *initializers[];
 443 };
 444
 445 struct initializer_string_t {
 446         initializer_base_t base;
 447         string_t           string;
 448 };
 449
 450 struct initializer_wide_string_t {
 451         initializer_base_t  base;
 452         wide_string_t       string;
 453 };
 454
 455 struct initializer_designator_t {
 456         initializer_base_t  base;
 457         designator_t       *designator;
 458 };
 459
 460 union initializer_t {
 461         initializer_kind_t        kind;
 462         initializer_base_t        base;
 463         initializer_value_t       value;
 464         initializer_list_t        list;
 465         initializer_string_t      string;
 466         initializer_wide_string_t wide_string;
 467         initializer_designator_t  designator;
 468 };
 469
 470 /**
 471  * The statement kinds.
 472  */
 473 typedef enum statement_kind_t {
 474         STATEMENT_INVALID,
 475         STATEMENT_EMPTY,
 476         STATEMENT_COMPOUND,
 477         STATEMENT_RETURN,
 478         STATEMENT_DECLARATION,
 479         STATEMENT_IF,
 480         STATEMENT_SWITCH,
 481         STATEMENT_EXPRESSION,
 482         STATEMENT_CONTINUE,
 483         STATEMENT_BREAK,
 484         STATEMENT_GOTO,
 485         STATEMENT_LABEL,
 486         STATEMENT_CASE_LABEL,
 487         STATEMENT_WHILE,
 488         STATEMENT_DO_WHILE,
 489         STATEMENT_FOR,
 490         STATEMENT_ASM,
 491         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 492         STATEMENT_LEAVE            /**< MS __leave */
 493 } statement_kind_t;
 494
 495 /**
 496  * The base class of every statement.
 497  */
 498 struct statement_base_t {
 499         statement_kind_t   kind;
 500         statement_t       *next;         /**< Point to the next statement in a compound statement. */
 501         source_position_t  source_position;
 502         statement_t       *parent;       /**< The Parent statement that controls the execution. */
 503         bool               reachable;    /**< True, if this statement is reachable. */
 504 #ifndef NDEBUG
 505         bool               transformed;
 506 #endif
 507 };
 508
 509 struct invalid_statement_t {
 510         statement_base_t  base;
 511 };
 512
 513 struct empty_statement_t {
 514         statement_base_t  base;
 515 };
 516
 517 struct return_statement_t {
 518         statement_base_t  base;
 519         expression_t     *value;    /**< The return value if any. */
 520 };
 521
 522 struct compound_statement_t {
 523         statement_base_t  base;
 524         statement_t      *statements;
 525         scope_t           scope;
 526         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 527 };
 528
 529 struct declaration_statement_t {
 530         statement_base_t  base;
 531         entity_t         *declarations_begin;
 532         entity_t         *declarations_end;
 533 };
 534
 535 struct if_statement_t {
 536         statement_base_t  base;
 537         expression_t     *condition;
 538         statement_t      *true_statement;
 539         statement_t      *false_statement;
 540 };
 541
 542 struct switch_statement_t {
 543         statement_base_t        base;
 544         expression_t           *expression;
 545         statement_t            *body;
 546         case_label_statement_t *first_case, *last_case;  /**< List of all cases, including default. */
 547         case_label_statement_t *default_label;           /**< The default label if existent. */
 548         unsigned long           default_proj_nr;         /**< The Proj-number for the default Proj. */
 549 };
 550
 551 struct goto_statement_t {
 552         statement_base_t  base;
 553         label_t          *label;         /**< The destination label. */
 554         expression_t     *expression;    /**< The expression for an assigned goto. */
 555         goto_statement_t *next;          /**< links all goto statements of a function */
 556 };
 557
 558 struct case_label_statement_t {
 559         statement_base_t        base;
 560         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 561         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 562         case_label_statement_t *next;          /**< link to the next case label in switch */
 563         statement_t            *statement;
 564         long                   first_case;     /**< The folded value of expression. */
 565         long                   last_case;      /**< The folded value of end_range. */
 566         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 567         bool                   is_empty_range; /**< If set marked this as an empty range. */
 568 };
 569
 570 struct label_statement_t {
 571         statement_base_t   base;
 572         label_t           *label;
 573         statement_t       *statement;
 574         label_statement_t *next;    /**< links all label statements of a function */
 575 };
 576
 577 struct expression_statement_t {
 578         statement_base_t  base;
 579         expression_t     *expression;
 580 };
 581
 582 struct while_statement_t {
 583         statement_base_t  base;
 584         expression_t     *condition;
 585         statement_t      *body;
 586 };
 587
 588 struct do_while_statement_t {
 589         statement_base_t  base;
 590         expression_t     *condition;
 591         statement_t      *body;
 592 };
 593
 594 struct for_statement_t {
 595         statement_base_t  base;
 596         expression_t     *initialisation;
 597         expression_t     *condition;
 598         expression_t     *step;
 599         statement_t      *body;
 600         scope_t           scope;
 601         bool              condition_reachable:1;
 602         bool              step_reachable:1;
 603 };
 604
 605 struct asm_argument_t {
 606         string_t        constraints;
 607         expression_t   *expression;
 608         symbol_t       *symbol;
 609         asm_argument_t *next;
 610 };
 611
 612 struct asm_clobber_t {
 613         string_t       clobber;
 614         asm_clobber_t *next;
 615 };
 616
 617 struct asm_statement_t {
 618         statement_base_t base;
 619         string_t         asm_text;
 620         asm_argument_t  *inputs;
 621         asm_argument_t  *outputs;
 622         asm_clobber_t   *clobbers;
 623         bool             is_volatile;
 624 };
 625
 626 struct ms_try_statement_t {
 627         statement_base_t  base;
 628         statement_t      *try_statement;
 629         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 630         statement_t      *final_statement;
 631 };
 632
 633 struct leave_statement_t {
 634         statement_base_t  base;
 635 };
 636
 637 union statement_t {
 638         statement_kind_t         kind;
 639         statement_base_t         base;
 640         return_statement_t       returns;
 641         compound_statement_t     compound;
 642         declaration_statement_t  declaration;
 643         if_statement_t           ifs;
 644         switch_statement_t       switchs;
 645         goto_statement_t         gotos;
 646         case_label_statement_t   case_label;
 647         label_statement_t        label;
 648         expression_statement_t   expression;
 649         while_statement_t        whiles;
 650         do_while_statement_t     do_while;
 651         for_statement_t          fors;
 652         asm_statement_t          asms;
 653         ms_try_statement_t       ms_try;
 654         leave_statement_t        leave;
 655 };
 656
 657 struct translation_unit_t {
 658         scope_t      scope;
 659         statement_t *global_asm;
 660 };
 661
 662 static inline void *_allocate_ast(size_t size)
 663 {
 664         return obstack_alloc(&ast_obstack, size);
 665 }
 666
 667 static inline bool is_invalid_expression(expression_t *expression)
 668 {
 669         return expression->base.kind == EXPR_INVALID;
 670 }
 671
 672 static inline bool is_invalid_statement(statement_t *statement)
 673 {
 674         return statement->base.kind == STATEMENT_INVALID;
 675 }
 676
 677 #define allocate_ast(size)                 _allocate_ast(size)
 678
 679 #endif