nsz Git - cparser/blob - ast_t.h

   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_ERROR = 1,
  66         EXPR_REFERENCE,
  67         EXPR_ENUM_CONSTANT,
  68         EXPR_LITERAL_BOOLEAN,
  69         EXPR_LITERAL_INTEGER,
  70         EXPR_LITERAL_FLOATINGPOINT,
  71         EXPR_LITERAL_CHARACTER,
  72         EXPR_LITERAL_MS_NOOP, /**< MS __noop extension */
  73         EXPR_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_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              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              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_ASSUME:            \
 214         case EXPR_UNARY_DELETE:            \
 215         case EXPR_UNARY_DELETE_ARRAY
 216
 217 /**
 218  * unary expression with optional operand
 219  */
 220 #define EXPR_UNARY_CASES_OPTIONAL \
 221         EXPR_UNARY_THROW
 222
 223 #define EXPR_UNARY_CASES           \
 224              EXPR_UNARY_CASES_MANDATORY: \
 225         case EXPR_UNARY_CASES_OPTIONAL
 226
 227 #define EXPR_LITERAL_CASES                     \
 228              EXPR_LITERAL_BOOLEAN:                   \
 229         case EXPR_LITERAL_INTEGER:                   \
 230         case EXPR_LITERAL_FLOATINGPOINT:             \
 231         case EXPR_LITERAL_MS_NOOP
 232
 233 /**
 234  * The base class of every expression.
 235  */
 236 struct expression_base_t {
 237         expression_kind_t   kind;            /**< The expression kind. */
 238         type_t             *type;            /**< The type of the expression. */
 239         source_position_t   source_position; /**< The source position of this expression. */
 240         bool                parenthesized : 1;
 241 #ifndef NDEBUG
 242         bool                transformed : 1;     /**< Set if this expression was transformed. */
 243 #endif
 244         bool                implicit : 1;    /**< compiler generated expression.
 245                                                   Examples:
 246                                                      select into anonymous structs
 247                                                      implicit casts
 248                                               */
 249 };
 250
 251 /**
 252  * integer, float and boolean constants
 253  */
 254 struct literal_expression_t {
 255         expression_base_t  base;
 256         string_t           value;
 257         string_t           suffix;
 258
 259         /* ast2firm data */
 260         ir_tarval         *target_value;
 261 };
 262
 263 /**
 264  * string and character literals
 265  */
 266 struct string_literal_expression_t {
 267         expression_base_t  base;
 268         string_encoding_t  encoding;
 269         string_t           value;
 270 };
 271
 272 struct funcname_expression_t {
 273         expression_base_t  base;
 274         funcname_kind_t    kind;
 275 };
 276
 277 struct compound_literal_expression_t {
 278         expression_base_t  base;
 279         type_t            *type;
 280         initializer_t     *initializer;
 281 };
 282
 283 struct builtin_constant_expression_t {
 284         expression_base_t  base;
 285         expression_t      *value;
 286 };
 287
 288 struct builtin_types_compatible_expression_t {
 289         expression_base_t  base;
 290         type_t            *left;
 291         type_t            *right;
 292 };
 293
 294 struct reference_expression_t {
 295         expression_base_t  base;
 296         entity_t          *entity;
 297 };
 298
 299 /**
 300  * An argument of a call.
 301  */
 302 struct call_argument_t {
 303         expression_t    *expression;  /**< The expression which value is transmitted. */
 304         call_argument_t *next;        /**< Links to the next argument of this call. */
 305 };
 306
 307
 308 struct call_expression_t {
 309         expression_base_t  base;
 310         expression_t      *function;  /**< The address of the function to call. */
 311         call_argument_t   *arguments; /**< List of arguments of this call. */
 312 };
 313
 314
 315 struct unary_expression_t {
 316         expression_base_t  base;
 317         expression_t      *value;     /**< The unary operand. */
 318 };
 319
 320 struct binary_expression_t {
 321         expression_base_t  base;
 322         expression_t      *left;
 323         expression_t      *right;
 324 };
 325
 326 struct select_expression_t {
 327         expression_base_t  base;
 328         expression_t      *compound;
 329         entity_t          *compound_entry;
 330 };
 331
 332 struct array_access_expression_t {
 333         expression_base_t  base;
 334         expression_t      *array_ref; /**< the referenced array */
 335         expression_t      *index;     /**< the index used */
 336         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 337 };
 338
 339 struct typeprop_expression_t {
 340         expression_base_t  base;
 341         type_t            *type;
 342         expression_t      *tp_expression;
 343 };
 344
 345 struct designator_t {
 346         source_position_t  source_position;
 347         symbol_t          *symbol;      /**< the symbol if any */
 348         expression_t      *array_index; /**< the array index if any */
 349         designator_t      *next;
 350 };
 351
 352 struct offsetof_expression_t {
 353         expression_base_t  base;
 354         type_t            *type;
 355         designator_t      *designator;
 356 };
 357
 358 struct va_start_expression_t {
 359         expression_base_t  base;
 360         expression_t      *ap;
 361         expression_t      *parameter;
 362 };
 363
 364 struct va_arg_expression_t {
 365         expression_base_t  base;
 366         expression_t      *ap;
 367 };
 368
 369 struct va_copy_expression_t {
 370         expression_base_t  base;
 371         expression_t      *dst;    /**< destination argument */
 372         expression_t      *src;    /**< source argument */
 373 };
 374
 375 struct conditional_expression_t {
 376         expression_base_t  base;
 377         expression_t      *condition;
 378         expression_t      *true_expression;
 379         expression_t      *false_expression;
 380 };
 381
 382 struct statement_expression_t {
 383         expression_base_t  base;
 384         statement_t       *statement;
 385 };
 386
 387 struct classify_type_expression_t {
 388         expression_base_t  base;
 389         expression_t      *type_expression;
 390 };
 391
 392 struct label_address_expression_t {
 393         expression_base_t  base;
 394         label_t           *label;
 395 };
 396
 397 union expression_t {
 398         expression_kind_t                     kind;
 399         expression_base_t                     base;
 400         literal_expression_t                  literal;
 401         string_literal_expression_t           string_literal;
 402         funcname_expression_t                 funcname;
 403         compound_literal_expression_t         compound_literal;
 404         builtin_constant_expression_t         builtin_constant;
 405         builtin_types_compatible_expression_t builtin_types_compatible;
 406         reference_expression_t                reference;
 407         call_expression_t                     call;
 408         unary_expression_t                    unary;
 409         binary_expression_t                   binary;
 410         select_expression_t                   select;
 411         array_access_expression_t             array_access;
 412         typeprop_expression_t                 typeprop;
 413         offsetof_expression_t                 offsetofe;
 414         va_start_expression_t                 va_starte;
 415         va_arg_expression_t                   va_arge;
 416         va_copy_expression_t                  va_copye;
 417         conditional_expression_t              conditional;
 418         statement_expression_t                statement;
 419         classify_type_expression_t            classify_type;
 420         label_address_expression_t            label_address;
 421 };
 422
 423 typedef enum initializer_kind_t {
 424         INITIALIZER_VALUE,
 425         INITIALIZER_LIST,
 426         INITIALIZER_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_designator_t {
 446         initializer_base_t  base;
 447         designator_t       *designator;
 448 };
 449
 450 union initializer_t {
 451         initializer_kind_t        kind;
 452         initializer_base_t        base;
 453         initializer_value_t       value;
 454         initializer_list_t        list;
 455         initializer_designator_t  designator;
 456 };
 457
 458 static inline string_literal_expression_t const *get_init_string(initializer_t const *const init)
 459 {
 460         assert(init->kind == INITIALIZER_STRING);
 461         assert(init->value.value->kind == EXPR_STRING_LITERAL);
 462         return &init->value.value->string_literal;
 463 }
 464
 465 /**
 466  * The statement kinds.
 467  */
 468 typedef enum statement_kind_t {
 469         STATEMENT_ERROR = 1,
 470         STATEMENT_EMPTY,
 471         STATEMENT_COMPOUND,
 472         STATEMENT_RETURN,
 473         STATEMENT_DECLARATION,
 474         STATEMENT_IF,
 475         STATEMENT_SWITCH,
 476         STATEMENT_EXPRESSION,
 477         STATEMENT_CONTINUE,
 478         STATEMENT_BREAK,
 479         STATEMENT_COMPUTED_GOTO,
 480         STATEMENT_GOTO,
 481         STATEMENT_LABEL,
 482         STATEMENT_CASE_LABEL,
 483         STATEMENT_WHILE,
 484         STATEMENT_DO_WHILE,
 485         STATEMENT_FOR,
 486         STATEMENT_ASM,
 487         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 488         STATEMENT_LEAVE            /**< MS __leave */
 489 } statement_kind_t;
 490
 491 /**
 492  * The base class of every statement.
 493  */
 494 struct statement_base_t {
 495         statement_kind_t   kind;
 496         statement_t       *next;         /**< Point to the next statement in a compound statement. */
 497         source_position_t  source_position;
 498         statement_t       *parent;       /**< The Parent statement that controls the execution. */
 499         bool               reachable;    /**< True, if this statement is reachable. */
 500 #ifndef NDEBUG
 501         bool               transformed;
 502 #endif
 503 };
 504
 505 struct return_statement_t {
 506         statement_base_t  base;
 507         expression_t     *value;    /**< The return value if any. */
 508 };
 509
 510 struct compound_statement_t {
 511         statement_base_t  base;
 512         statement_t      *statements;
 513         scope_t           scope;
 514         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 515 };
 516
 517 struct declaration_statement_t {
 518         statement_base_t  base;
 519         entity_t         *declarations_begin;
 520         entity_t         *declarations_end;
 521 };
 522
 523 struct if_statement_t {
 524         statement_base_t  base;
 525         scope_t           scope;
 526         expression_t     *condition;
 527         statement_t      *true_statement;
 528         statement_t      *false_statement;
 529 };
 530
 531 struct switch_statement_t {
 532         statement_base_t        base;
 533         scope_t                 scope;
 534         expression_t           *expression;
 535         statement_t            *body;
 536         case_label_statement_t *first_case, *last_case; /**< List of all cases, including default. */
 537         case_label_statement_t *default_label;          /**< The default label if existent. */
 538 };
 539
 540 struct goto_statement_t {
 541         statement_base_t  base;
 542         label_t          *label;         /**< The destination label. */
 543         goto_statement_t *next;          /**< links all goto statements of a function */
 544 };
 545
 546 struct computed_goto_statement_t {
 547         statement_base_t  base;
 548         expression_t     *expression; /**< The expression for the computed goto. */
 549 };
 550
 551 struct case_label_statement_t {
 552         statement_base_t        base;
 553         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 554         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 555         case_label_statement_t *next;          /**< link to the next case label in switch */
 556         statement_t            *statement;
 557         long                   first_case;     /**< The folded value of expression. */
 558         long                   last_case;      /**< The folded value of end_range. */
 559         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 560         bool                   is_empty_range; /**< If set marked this as an empty range. */
 561         long                   pn;
 562 };
 563
 564 struct label_statement_t {
 565         statement_base_t   base;
 566         label_t           *label;
 567         statement_t       *statement;
 568         label_statement_t *next;    /**< links all label statements of a function */
 569 };
 570
 571 struct expression_statement_t {
 572         statement_base_t  base;
 573         expression_t     *expression;
 574 };
 575
 576 struct while_statement_t {
 577         statement_base_t  base;
 578         scope_t           scope;
 579         expression_t     *condition;
 580         statement_t      *body;
 581 };
 582
 583 struct do_while_statement_t {
 584         statement_base_t  base;
 585         scope_t           scope;
 586         expression_t     *condition;
 587         statement_t      *body;
 588 };
 589
 590 struct for_statement_t {
 591         statement_base_t  base;
 592         scope_t           scope;
 593         expression_t     *initialisation;
 594         expression_t     *condition;
 595         expression_t     *step;
 596         statement_t      *body;
 597         bool              condition_reachable:1;
 598         bool              step_reachable:1;
 599 };
 600
 601 struct asm_argument_t {
 602         string_t        constraints;
 603         expression_t   *expression;
 604         symbol_t       *symbol;
 605         asm_argument_t *next;
 606 };
 607
 608 struct asm_clobber_t {
 609         string_t       clobber;
 610         asm_clobber_t *next;
 611 };
 612
 613 struct asm_statement_t {
 614         statement_base_t base;
 615         string_t         asm_text;
 616         asm_argument_t  *inputs;
 617         asm_argument_t  *outputs;
 618         asm_clobber_t   *clobbers;
 619         bool             is_volatile;
 620 };
 621
 622 struct ms_try_statement_t {
 623         statement_base_t  base;
 624         statement_t      *try_statement;
 625         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 626         statement_t      *final_statement;
 627 };
 628
 629 struct leave_statement_t {
 630         statement_base_t  base;
 631 };
 632
 633 union statement_t {
 634         statement_kind_t          kind;
 635         statement_base_t          base;
 636         return_statement_t        returns;
 637         compound_statement_t      compound;
 638         declaration_statement_t   declaration;
 639         if_statement_t            ifs;
 640         switch_statement_t        switchs;
 641         computed_goto_statement_t computed_goto;
 642         goto_statement_t          gotos;
 643         case_label_statement_t    case_label;
 644         label_statement_t         label;
 645         expression_statement_t    expression;
 646         while_statement_t         whiles;
 647         do_while_statement_t      do_while;
 648         for_statement_t           fors;
 649         asm_statement_t           asms;
 650         ms_try_statement_t        ms_try;
 651         leave_statement_t         leave;
 652 };
 653
 654 struct translation_unit_t {
 655         scope_t      scope;
 656         statement_t *global_asm;
 657 };
 658
 659 /**
 660  * Allocate an AST node with given size and
 661  * initialize all fields with zero.
 662  */
 663 static inline void *allocate_ast_zero(size_t size)
 664 {
 665         return memset(obstack_alloc(&ast_obstack, size), 0, size);
 666 }
 667
 668 /** If set, implicit casts are printed. */
 669 extern bool print_implicit_casts;
 670 /** If set parenthesis are printed to indicate operator precedence. */
 671 extern bool print_parenthesis;
 672
 673 #endif