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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_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;
 237 #ifndef NDEBUG
 238         bool                transformed;     /**< 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 };
 327
 328 struct array_access_expression_t {
 329         expression_base_t  base;
 330         expression_t      *array_ref; /**< the referenced array */
 331         expression_t      *index;     /**< the index used */
 332         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 333 };
 334
 335 struct typeprop_expression_t {
 336         expression_base_t  base;
 337         type_t            *type;
 338         expression_t      *tp_expression;
 339 };
 340
 341 struct designator_t {
 342         source_position_t  source_position;
 343         symbol_t          *symbol;      /**< the symbol if any */
 344         expression_t      *array_index; /**< the array index if any */
 345         designator_t      *next;
 346 };
 347
 348 struct offsetof_expression_t {
 349         expression_base_t  base;
 350         type_t            *type;
 351         designator_t      *designator;
 352 };
 353
 354 struct va_start_expression_t {
 355         expression_base_t  base;
 356         expression_t      *ap;
 357         variable_t        *parameter;
 358 };
 359
 360 struct va_arg_expression_t {
 361         expression_base_t  base;
 362         expression_t      *ap;
 363 };
 364
 365 struct va_copy_expression_t {
 366         expression_base_t  base;
 367         expression_t      *dst;    /**< destination argument */
 368         expression_t      *src;    /**< source argument */
 369 };
 370
 371 struct conditional_expression_t {
 372         expression_base_t  base;
 373         expression_t      *condition;
 374         expression_t      *true_expression;
 375         expression_t      *false_expression;
 376 };
 377
 378 struct statement_expression_t {
 379         expression_base_t  base;
 380         statement_t       *statement;
 381 };
 382
 383 struct classify_type_expression_t {
 384         expression_base_t  base;
 385         expression_t      *type_expression;
 386 };
 387
 388 struct label_address_expression_t {
 389         expression_base_t  base;
 390         label_t           *label;
 391 };
 392
 393 union expression_t {
 394         expression_kind_t                     kind;
 395         expression_base_t                     base;
 396         const_expression_t                    conste;
 397         funcname_expression_t                 funcname;
 398         string_literal_expression_t           string;
 399         wide_string_literal_expression_t      wide_string;
 400         compound_literal_expression_t         compound_literal;
 401         builtin_constant_expression_t         builtin_constant;
 402         builtin_types_compatible_expression_t builtin_types_compatible;
 403         reference_expression_t                reference;
 404         call_expression_t                     call;
 405         unary_expression_t                    unary;
 406         binary_expression_t                   binary;
 407         select_expression_t                   select;
 408         array_access_expression_t             array_access;
 409         typeprop_expression_t                 typeprop;
 410         offsetof_expression_t                 offsetofe;
 411         va_start_expression_t                 va_starte;
 412         va_arg_expression_t                   va_arge;
 413         va_copy_expression_t                  va_copye;
 414         conditional_expression_t              conditional;
 415         statement_expression_t                statement;
 416         classify_type_expression_t            classify_type;
 417         label_address_expression_t            label_address;
 418 };
 419
 420 typedef enum initializer_kind_t {
 421         INITIALIZER_VALUE,
 422         INITIALIZER_LIST,
 423         INITIALIZER_STRING,
 424         INITIALIZER_WIDE_STRING,
 425         INITIALIZER_DESIGNATOR
 426 } initializer_kind_t;
 427
 428 struct initializer_base_t {
 429         initializer_kind_t kind;
 430 };
 431
 432 struct initializer_value_t {
 433         initializer_base_t  base;
 434         expression_t       *value;
 435 };
 436
 437 struct initializer_list_t {
 438         initializer_base_t  base;
 439         size_t              len;
 440         initializer_t      *initializers[];
 441 };
 442
 443 struct initializer_string_t {
 444         initializer_base_t base;
 445         string_t           string;
 446 };
 447
 448 struct initializer_wide_string_t {
 449         initializer_base_t  base;
 450         wide_string_t       string;
 451 };
 452
 453 struct initializer_designator_t {
 454         initializer_base_t  base;
 455         designator_t       *designator;
 456 };
 457
 458 union initializer_t {
 459         initializer_kind_t        kind;
 460         initializer_base_t        base;
 461         initializer_value_t       value;
 462         initializer_list_t        list;
 463         initializer_string_t      string;
 464         initializer_wide_string_t wide_string;
 465         initializer_designator_t  designator;
 466 };
 467
 468 /**
 469  * The statement kinds.
 470  */
 471 typedef enum statement_kind_t {
 472         STATEMENT_INVALID,
 473         STATEMENT_EMPTY,
 474         STATEMENT_COMPOUND,
 475         STATEMENT_RETURN,
 476         STATEMENT_DECLARATION,
 477         STATEMENT_IF,
 478         STATEMENT_SWITCH,
 479         STATEMENT_EXPRESSION,
 480         STATEMENT_CONTINUE,
 481         STATEMENT_BREAK,
 482         STATEMENT_GOTO,
 483         STATEMENT_LABEL,
 484         STATEMENT_CASE_LABEL,
 485         STATEMENT_WHILE,
 486         STATEMENT_DO_WHILE,
 487         STATEMENT_FOR,
 488         STATEMENT_ASM,
 489         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 490         STATEMENT_LEAVE            /**< MS __leave */
 491 } statement_kind_t;
 492
 493 /**
 494  * The base class of every statement.
 495  */
 496 struct statement_base_t {
 497         statement_kind_t   kind;
 498         statement_t       *next;         /**< Point to the next statement in a compound statement. */
 499         source_position_t  source_position;
 500         statement_t       *parent;       /**< The Parent statement that controls the execution. */
 501         bool               reachable;    /**< True, if this statement is reachable. */
 502 #ifndef NDEBUG
 503         bool               transformed;
 504 #endif
 505 };
 506
 507 struct invalid_statement_t {
 508         statement_base_t  base;
 509 };
 510
 511 struct empty_statement_t {
 512         statement_base_t  base;
 513 };
 514
 515 struct return_statement_t {
 516         statement_base_t  base;
 517         expression_t     *value;    /**< The return value if any. */
 518 };
 519
 520 struct compound_statement_t {
 521         statement_base_t  base;
 522         statement_t      *statements;
 523         scope_t           scope;
 524         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 525 };
 526
 527 struct declaration_statement_t {
 528         statement_base_t  base;
 529         entity_t         *declarations_begin;
 530         entity_t         *declarations_end;
 531 };
 532
 533 struct if_statement_t {
 534         statement_base_t  base;
 535         expression_t     *condition;
 536         statement_t      *true_statement;
 537         statement_t      *false_statement;
 538 };
 539
 540 struct switch_statement_t {
 541         statement_base_t        base;
 542         expression_t           *expression;
 543         statement_t            *body;
 544         case_label_statement_t *first_case, *last_case;  /**< List of all cases, including default. */
 545         case_label_statement_t *default_label;           /**< The default label if existent. */
 546         unsigned long           default_proj_nr;         /**< The Proj-number for the default Proj. */
 547 };
 548
 549 struct goto_statement_t {
 550         statement_base_t  base;
 551         label_t          *label;         /**< The destination label. */
 552         expression_t     *expression;    /**< The expression for an assigned goto. */
 553         goto_statement_t *next;          /**< links all goto statements of a function */
 554 };
 555
 556 struct case_label_statement_t {
 557         statement_base_t        base;
 558         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 559         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 560         case_label_statement_t *next;          /**< link to the next case label in switch */
 561         statement_t            *statement;
 562         long                   first_case;     /**< The folded value of expression. */
 563         long                   last_case;      /**< The folded value of end_range. */
 564         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 565         bool                   is_empty_range; /**< If set marked this as an empty range. */
 566 };
 567
 568 struct label_statement_t {
 569         statement_base_t   base;
 570         label_t           *label;
 571         statement_t       *statement;
 572         label_statement_t *next;    /**< links all label statements of a function */
 573 };
 574
 575 struct expression_statement_t {
 576         statement_base_t  base;
 577         expression_t     *expression;
 578 };
 579
 580 struct while_statement_t {
 581         statement_base_t  base;
 582         expression_t     *condition;
 583         statement_t      *body;
 584 };
 585
 586 struct do_while_statement_t {
 587         statement_base_t  base;
 588         expression_t     *condition;
 589         statement_t      *body;
 590 };
 591
 592 struct for_statement_t {
 593         statement_base_t  base;
 594         expression_t     *initialisation;
 595         expression_t     *condition;
 596         expression_t     *step;
 597         statement_t      *body;
 598         scope_t           scope;
 599         bool              condition_reachable:1;
 600         bool              step_reachable:1;
 601 };
 602
 603 struct asm_argument_t {
 604         string_t        constraints;
 605         expression_t   *expression;
 606         symbol_t       *symbol;
 607         asm_argument_t *next;
 608 };
 609
 610 struct asm_clobber_t {
 611         string_t       clobber;
 612         asm_clobber_t *next;
 613 };
 614
 615 struct asm_statement_t {
 616         statement_base_t base;
 617         string_t         asm_text;
 618         asm_argument_t  *inputs;
 619         asm_argument_t  *outputs;
 620         asm_clobber_t   *clobbers;
 621         bool             is_volatile;
 622 };
 623
 624 struct ms_try_statement_t {
 625         statement_base_t  base;
 626         statement_t      *try_statement;
 627         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 628         statement_t      *final_statement;
 629 };
 630
 631 struct leave_statement_t {
 632         statement_base_t  base;
 633 };
 634
 635 union statement_t {
 636         statement_kind_t         kind;
 637         statement_base_t         base;
 638         return_statement_t       returns;
 639         compound_statement_t     compound;
 640         declaration_statement_t  declaration;
 641         if_statement_t           ifs;
 642         switch_statement_t       switchs;
 643         goto_statement_t         gotos;
 644         case_label_statement_t   case_label;
 645         label_statement_t        label;
 646         expression_statement_t   expression;
 647         while_statement_t        whiles;
 648         do_while_statement_t     do_while;
 649         for_statement_t          fors;
 650         asm_statement_t          asms;
 651         ms_try_statement_t       ms_try;
 652         leave_statement_t        leave;
 653 };
 654
 655 struct translation_unit_t {
 656         scope_t      scope;
 657         statement_t *global_asm;
 658 };
 659
 660 static inline
 661 void *_allocate_ast(size_t size)
 662 {
 663         return obstack_alloc(&ast_obstack, size);
 664 }
 665
 666 static inline
 667 bool is_invalid_expression(expression_t *expression)
 668 {
 669         return expression->base.kind == EXPR_INVALID;
 670 }
 671
 672 static inline
 673 bool is_invalid_statement(statement_t *statement)
 674 {
 675         return statement->base.kind == STATEMENT_INVALID;
 676 }
 677
 678 #define allocate_ast(size)                 _allocate_ast(size)
 679
 680 #endif