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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_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_WIDE_CHARACTER,
  73         EXPR_LITERAL_MS_NOOP, /**< MS __noop extension */
  74         EXPR_STRING_LITERAL,
  75         EXPR_COMPOUND_LITERAL,
  76         EXPR_CALL,
  77         EXPR_CONDITIONAL,
  78         EXPR_SELECT,
  79         EXPR_ARRAY_ACCESS,
  80         EXPR_SIZEOF,
  81         EXPR_CLASSIFY_TYPE,
  82         EXPR_ALIGNOF,
  83
  84         EXPR_FUNCNAME,
  85         EXPR_BUILTIN_CONSTANT_P,
  86         EXPR_BUILTIN_TYPES_COMPATIBLE_P,
  87         EXPR_OFFSETOF,
  88         EXPR_VA_START,
  89         EXPR_VA_ARG,
  90         EXPR_VA_COPY,
  91         EXPR_STATEMENT,
  92         EXPR_LABEL_ADDRESS, /**< GCC extension &&label operator */
  93
  94         EXPR_UNARY_FIRST,
  95         EXPR_UNARY_NEGATE = EXPR_UNARY_FIRST,
  96         EXPR_UNARY_PLUS,
  97         EXPR_UNARY_BITWISE_NEGATE,
  98         EXPR_UNARY_NOT,
  99         EXPR_UNARY_DEREFERENCE,
 100         EXPR_UNARY_TAKE_ADDRESS,
 101         EXPR_UNARY_POSTFIX_INCREMENT,
 102         EXPR_UNARY_POSTFIX_DECREMENT,
 103         EXPR_UNARY_PREFIX_INCREMENT,
 104         EXPR_UNARY_PREFIX_DECREMENT,
 105         EXPR_UNARY_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              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              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_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         EXPR_UNARY_THROW
 223
 224 #define EXPR_UNARY_CASES           \
 225              EXPR_UNARY_CASES_MANDATORY: \
 226         case EXPR_UNARY_CASES_OPTIONAL
 227
 228 #define EXPR_LITERAL_CASES                     \
 229              EXPR_LITERAL_BOOLEAN:                   \
 230         case EXPR_LITERAL_INTEGER:                   \
 231         case EXPR_LITERAL_FLOATINGPOINT:             \
 232         case EXPR_LITERAL_CHARACTER:                 \
 233         case EXPR_LITERAL_WIDE_CHARACTER:            \
 234         case EXPR_LITERAL_MS_NOOP
 235
 236 /**
 237  * The base class of every expression.
 238  */
 239 struct expression_base_t {
 240         expression_kind_t   kind;            /**< The expression kind. */
 241         type_t             *type;            /**< The type of the expression. */
 242         source_position_t   source_position; /**< The source position of this expression. */
 243         bool                parenthesized : 1;
 244 #ifndef NDEBUG
 245         bool                transformed : 1;     /**< Set if this expression was transformed. */
 246 #endif
 247         bool                implicit : 1;    /**< compiler generated expression.
 248                                                   Examples:
 249                                                      select into anonymous structs
 250                                                      implicit casts
 251                                               */
 252 };
 253
 254 /**
 255  * integer/float constants, character and string literals
 256  */
 257 struct literal_expression_t {
 258         expression_base_t  base;
 259         string_t           value;
 260         string_t           suffix;
 261
 262         /* ast2firm data */
 263         ir_tarval         *target_value;
 264 };
 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         string_t           value;     /**< the value once assigned. */
 276 };
 277
 278 struct compound_literal_expression_t {
 279         expression_base_t  base;
 280         type_t            *type;
 281         initializer_t     *initializer;
 282 };
 283
 284 struct builtin_constant_expression_t {
 285         expression_base_t  base;
 286         expression_t      *value;
 287 };
 288
 289 struct builtin_types_compatible_expression_t {
 290         expression_base_t  base;
 291         type_t            *left;
 292         type_t            *right;
 293 };
 294
 295 struct reference_expression_t {
 296         expression_base_t  base;
 297         entity_t          *entity;
 298 };
 299
 300 /**
 301  * An argument of a call.
 302  */
 303 struct call_argument_t {
 304         expression_t    *expression;  /**< The expression which value is transmitted. */
 305         call_argument_t *next;        /**< Links to the next argument of this call. */
 306 };
 307
 308
 309 struct call_expression_t {
 310         expression_base_t  base;
 311         expression_t      *function;  /**< The address of the function to call. */
 312         call_argument_t   *arguments; /**< List of arguments of this call. */
 313 };
 314
 315
 316 struct unary_expression_t {
 317         expression_base_t  base;
 318         expression_t      *value;     /**< The unary operand. */
 319 };
 320
 321 struct binary_expression_t {
 322         expression_base_t  base;
 323         expression_t      *left;
 324         expression_t      *right;
 325 };
 326
 327 struct select_expression_t {
 328         expression_base_t  base;
 329         expression_t      *compound;
 330         entity_t          *compound_entry;
 331 };
 332
 333 struct array_access_expression_t {
 334         expression_base_t  base;
 335         expression_t      *array_ref; /**< the referenced array */
 336         expression_t      *index;     /**< the index used */
 337         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 338 };
 339
 340 struct typeprop_expression_t {
 341         expression_base_t  base;
 342         type_t            *type;
 343         expression_t      *tp_expression;
 344 };
 345
 346 struct designator_t {
 347         source_position_t  source_position;
 348         symbol_t          *symbol;      /**< the symbol if any */
 349         expression_t      *array_index; /**< the array index if any */
 350         designator_t      *next;
 351 };
 352
 353 struct offsetof_expression_t {
 354         expression_base_t  base;
 355         type_t            *type;
 356         designator_t      *designator;
 357 };
 358
 359 struct va_start_expression_t {
 360         expression_base_t  base;
 361         expression_t      *ap;
 362         expression_t      *parameter;
 363 };
 364
 365 struct va_arg_expression_t {
 366         expression_base_t  base;
 367         expression_t      *ap;
 368 };
 369
 370 struct va_copy_expression_t {
 371         expression_base_t  base;
 372         expression_t      *dst;    /**< destination argument */
 373         expression_t      *src;    /**< source argument */
 374 };
 375
 376 struct conditional_expression_t {
 377         expression_base_t  base;
 378         expression_t      *condition;
 379         expression_t      *true_expression;
 380         expression_t      *false_expression;
 381 };
 382
 383 struct statement_expression_t {
 384         expression_base_t  base;
 385         statement_t       *statement;
 386 };
 387
 388 struct classify_type_expression_t {
 389         expression_base_t  base;
 390         expression_t      *type_expression;
 391 };
 392
 393 struct label_address_expression_t {
 394         expression_base_t  base;
 395         label_t           *label;
 396 };
 397
 398 union expression_t {
 399         expression_kind_t                     kind;
 400         expression_base_t                     base;
 401         literal_expression_t                  literal;
 402         string_literal_expression_t           string_literal;
 403         funcname_expression_t                 funcname;
 404         compound_literal_expression_t         compound_literal;
 405         builtin_constant_expression_t         builtin_constant;
 406         builtin_types_compatible_expression_t builtin_types_compatible;
 407         reference_expression_t                reference;
 408         call_expression_t                     call;
 409         unary_expression_t                    unary;
 410         binary_expression_t                   binary;
 411         select_expression_t                   select;
 412         array_access_expression_t             array_access;
 413         typeprop_expression_t                 typeprop;
 414         offsetof_expression_t                 offsetofe;
 415         va_start_expression_t                 va_starte;
 416         va_arg_expression_t                   va_arge;
 417         va_copy_expression_t                  va_copye;
 418         conditional_expression_t              conditional;
 419         statement_expression_t                statement;
 420         classify_type_expression_t            classify_type;
 421         label_address_expression_t            label_address;
 422 };
 423
 424 typedef enum initializer_kind_t {
 425         INITIALIZER_VALUE,
 426         INITIALIZER_LIST,
 427         INITIALIZER_STRING,
 428         INITIALIZER_WIDE_STRING,
 429         INITIALIZER_DESIGNATOR
 430 } initializer_kind_t;
 431
 432 struct initializer_base_t {
 433         initializer_kind_t kind;
 434 };
 435
 436 struct initializer_value_t {
 437         initializer_base_t  base;
 438         expression_t       *value;
 439 };
 440
 441 struct initializer_list_t {
 442         initializer_base_t  base;
 443         size_t              len;
 444         initializer_t      *initializers[];
 445 };
 446
 447 struct initializer_string_t {
 448         initializer_base_t base;
 449         string_t           string;
 450 };
 451
 452 struct initializer_wide_string_t {
 453         initializer_base_t  base;
 454         string_t            string;
 455 };
 456
 457 struct initializer_designator_t {
 458         initializer_base_t  base;
 459         designator_t       *designator;
 460 };
 461
 462 union initializer_t {
 463         initializer_kind_t        kind;
 464         initializer_base_t        base;
 465         initializer_value_t       value;
 466         initializer_list_t        list;
 467         initializer_string_t      string;
 468         initializer_wide_string_t wide_string;
 469         initializer_designator_t  designator;
 470 };
 471
 472 /**
 473  * The statement kinds.
 474  */
 475 typedef enum statement_kind_t {
 476         STATEMENT_ERROR = 1,
 477         STATEMENT_EMPTY,
 478         STATEMENT_COMPOUND,
 479         STATEMENT_RETURN,
 480         STATEMENT_DECLARATION,
 481         STATEMENT_IF,
 482         STATEMENT_SWITCH,
 483         STATEMENT_EXPRESSION,
 484         STATEMENT_CONTINUE,
 485         STATEMENT_BREAK,
 486         STATEMENT_COMPUTED_GOTO,
 487         STATEMENT_GOTO,
 488         STATEMENT_LABEL,
 489         STATEMENT_CASE_LABEL,
 490         STATEMENT_WHILE,
 491         STATEMENT_DO_WHILE,
 492         STATEMENT_FOR,
 493         STATEMENT_ASM,
 494         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 495         STATEMENT_LEAVE            /**< MS __leave */
 496 } statement_kind_t;
 497
 498 /**
 499  * The base class of every statement.
 500  */
 501 struct statement_base_t {
 502         statement_kind_t   kind;
 503         statement_t       *next;         /**< Point to the next statement in a compound statement. */
 504         source_position_t  source_position;
 505         statement_t       *parent;       /**< The Parent statement that controls the execution. */
 506         bool               reachable;    /**< True, if this statement is reachable. */
 507 #ifndef NDEBUG
 508         bool               transformed;
 509 #endif
 510 };
 511
 512 struct return_statement_t {
 513         statement_base_t  base;
 514         expression_t     *value;    /**< The return value if any. */
 515 };
 516
 517 struct compound_statement_t {
 518         statement_base_t  base;
 519         statement_t      *statements;
 520         scope_t           scope;
 521         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 522 };
 523
 524 struct declaration_statement_t {
 525         statement_base_t  base;
 526         entity_t         *declarations_begin;
 527         entity_t         *declarations_end;
 528 };
 529
 530 struct if_statement_t {
 531         statement_base_t  base;
 532         scope_t           scope;
 533         expression_t     *condition;
 534         statement_t      *true_statement;
 535         statement_t      *false_statement;
 536 };
 537
 538 struct switch_statement_t {
 539         statement_base_t        base;
 540         scope_t                 scope;
 541         expression_t           *expression;
 542         statement_t            *body;
 543         case_label_statement_t *first_case, *last_case; /**< List of all cases, including default. */
 544         case_label_statement_t *default_label;          /**< The default label if existent. */
 545 };
 546
 547 struct goto_statement_t {
 548         statement_base_t  base;
 549         label_t          *label;         /**< The destination label. */
 550         goto_statement_t *next;          /**< links all goto statements of a function */
 551 };
 552
 553 struct computed_goto_statement_t {
 554         statement_base_t  base;
 555         expression_t     *expression; /**< The expression for the computed goto. */
 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         long                   pn;
 569 };
 570
 571 struct label_statement_t {
 572         statement_base_t   base;
 573         label_t           *label;
 574         statement_t       *statement;
 575         label_statement_t *next;    /**< links all label statements of a function */
 576 };
 577
 578 struct expression_statement_t {
 579         statement_base_t  base;
 580         expression_t     *expression;
 581 };
 582
 583 struct while_statement_t {
 584         statement_base_t  base;
 585         scope_t           scope;
 586         expression_t     *condition;
 587         statement_t      *body;
 588 };
 589
 590 struct do_while_statement_t {
 591         statement_base_t  base;
 592         scope_t           scope;
 593         expression_t     *condition;
 594         statement_t      *body;
 595 };
 596
 597 struct for_statement_t {
 598         statement_base_t  base;
 599         scope_t           scope;
 600         expression_t     *initialisation;
 601         expression_t     *condition;
 602         expression_t     *step;
 603         statement_t      *body;
 604         bool              condition_reachable:1;
 605         bool              step_reachable:1;
 606 };
 607
 608 struct asm_argument_t {
 609         string_t        constraints;
 610         expression_t   *expression;
 611         symbol_t       *symbol;
 612         asm_argument_t *next;
 613 };
 614
 615 struct asm_clobber_t {
 616         string_t       clobber;
 617         asm_clobber_t *next;
 618 };
 619
 620 struct asm_statement_t {
 621         statement_base_t base;
 622         string_t         asm_text;
 623         asm_argument_t  *inputs;
 624         asm_argument_t  *outputs;
 625         asm_clobber_t   *clobbers;
 626         bool             is_volatile;
 627 };
 628
 629 struct ms_try_statement_t {
 630         statement_base_t  base;
 631         statement_t      *try_statement;
 632         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 633         statement_t      *final_statement;
 634 };
 635
 636 struct leave_statement_t {
 637         statement_base_t  base;
 638 };
 639
 640 union statement_t {
 641         statement_kind_t          kind;
 642         statement_base_t          base;
 643         return_statement_t        returns;
 644         compound_statement_t      compound;
 645         declaration_statement_t   declaration;
 646         if_statement_t            ifs;
 647         switch_statement_t        switchs;
 648         computed_goto_statement_t computed_goto;
 649         goto_statement_t          gotos;
 650         case_label_statement_t    case_label;
 651         label_statement_t         label;
 652         expression_statement_t    expression;
 653         while_statement_t         whiles;
 654         do_while_statement_t      do_while;
 655         for_statement_t           fors;
 656         asm_statement_t           asms;
 657         ms_try_statement_t        ms_try;
 658         leave_statement_t         leave;
 659 };
 660
 661 struct translation_unit_t {
 662         scope_t      scope;
 663         statement_t *global_asm;
 664 };
 665
 666 /**
 667  * Allocate an AST node with given size and
 668  * initialize all fields with zero.
 669  */
 670 static inline void *allocate_ast_zero(size_t size)
 671 {
 672         return memset(obstack_alloc(&ast_obstack, size), 0, size);
 673 }
 674
 675 /** If set, implicit casts are printed. */
 676 extern bool print_implicit_casts;
 677 /** If set parenthesis are printed to indicate operator precedence. */
 678 extern bool print_parenthesis;
 679
 680 #endif