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_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_MS_NOOP
 233
 234 /**
 235  * The base class of every expression.
 236  */
 237 struct expression_base_t {
 238         expression_kind_t   kind;            /**< The expression kind. */
 239         type_t             *type;            /**< The type of the expression. */
 240         source_position_t   source_position; /**< The source position of this expression. */
 241         bool                parenthesized : 1;
 242 #ifndef NDEBUG
 243         bool                transformed : 1;     /**< Set if this expression was transformed. */
 244 #endif
 245         bool                implicit : 1;    /**< compiler generated expression.
 246                                                   Examples:
 247                                                      select into anonymous structs
 248                                                      implicit casts
 249                                               */
 250 };
 251
 252 /**
 253  * integer, float and boolean constants
 254  */
 255 struct literal_expression_t {
 256         expression_base_t  base;
 257         string_t           value;
 258         string_t           suffix;
 259
 260         /* ast2firm data */
 261         ir_tarval         *target_value;
 262 };
 263
 264 /**
 265  * string and character literals
 266  */
 267 struct string_literal_expression_t {
 268         expression_base_t  base;
 269         string_encoding_t  encoding;
 270         string_t           value;
 271 };
 272
 273 struct funcname_expression_t {
 274         expression_base_t  base;
 275         funcname_kind_t    kind;
 276         string_t           value;     /**< the value once assigned. */
 277 };
 278
 279 struct compound_literal_expression_t {
 280         expression_base_t  base;
 281         type_t            *type;
 282         initializer_t     *initializer;
 283 };
 284
 285 struct builtin_constant_expression_t {
 286         expression_base_t  base;
 287         expression_t      *value;
 288 };
 289
 290 struct builtin_types_compatible_expression_t {
 291         expression_base_t  base;
 292         type_t            *left;
 293         type_t            *right;
 294 };
 295
 296 struct reference_expression_t {
 297         expression_base_t  base;
 298         entity_t          *entity;
 299 };
 300
 301 /**
 302  * An argument of a call.
 303  */
 304 struct call_argument_t {
 305         expression_t    *expression;  /**< The expression which value is transmitted. */
 306         call_argument_t *next;        /**< Links to the next argument of this call. */
 307 };
 308
 309
 310 struct call_expression_t {
 311         expression_base_t  base;
 312         expression_t      *function;  /**< The address of the function to call. */
 313         call_argument_t   *arguments; /**< List of arguments of this call. */
 314 };
 315
 316
 317 struct unary_expression_t {
 318         expression_base_t  base;
 319         expression_t      *value;     /**< The unary operand. */
 320 };
 321
 322 struct binary_expression_t {
 323         expression_base_t  base;
 324         expression_t      *left;
 325         expression_t      *right;
 326 };
 327
 328 struct select_expression_t {
 329         expression_base_t  base;
 330         expression_t      *compound;
 331         entity_t          *compound_entry;
 332 };
 333
 334 struct array_access_expression_t {
 335         expression_base_t  base;
 336         expression_t      *array_ref; /**< the referenced array */
 337         expression_t      *index;     /**< the index used */
 338         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 339 };
 340
 341 struct typeprop_expression_t {
 342         expression_base_t  base;
 343         type_t            *type;
 344         expression_t      *tp_expression;
 345 };
 346
 347 struct designator_t {
 348         source_position_t  source_position;
 349         symbol_t          *symbol;      /**< the symbol if any */
 350         expression_t      *array_index; /**< the array index if any */
 351         designator_t      *next;
 352 };
 353
 354 struct offsetof_expression_t {
 355         expression_base_t  base;
 356         type_t            *type;
 357         designator_t      *designator;
 358 };
 359
 360 struct va_start_expression_t {
 361         expression_base_t  base;
 362         expression_t      *ap;
 363         expression_t      *parameter;
 364 };
 365
 366 struct va_arg_expression_t {
 367         expression_base_t  base;
 368         expression_t      *ap;
 369 };
 370
 371 struct va_copy_expression_t {
 372         expression_base_t  base;
 373         expression_t      *dst;    /**< destination argument */
 374         expression_t      *src;    /**< source argument */
 375 };
 376
 377 struct conditional_expression_t {
 378         expression_base_t  base;
 379         expression_t      *condition;
 380         expression_t      *true_expression;
 381         expression_t      *false_expression;
 382 };
 383
 384 struct statement_expression_t {
 385         expression_base_t  base;
 386         statement_t       *statement;
 387 };
 388
 389 struct classify_type_expression_t {
 390         expression_base_t  base;
 391         expression_t      *type_expression;
 392 };
 393
 394 struct label_address_expression_t {
 395         expression_base_t  base;
 396         label_t           *label;
 397 };
 398
 399 union expression_t {
 400         expression_kind_t                     kind;
 401         expression_base_t                     base;
 402         literal_expression_t                  literal;
 403         string_literal_expression_t           string_literal;
 404         funcname_expression_t                 funcname;
 405         compound_literal_expression_t         compound_literal;
 406         builtin_constant_expression_t         builtin_constant;
 407         builtin_types_compatible_expression_t builtin_types_compatible;
 408         reference_expression_t                reference;
 409         call_expression_t                     call;
 410         unary_expression_t                    unary;
 411         binary_expression_t                   binary;
 412         select_expression_t                   select;
 413         array_access_expression_t             array_access;
 414         typeprop_expression_t                 typeprop;
 415         offsetof_expression_t                 offsetofe;
 416         va_start_expression_t                 va_starte;
 417         va_arg_expression_t                   va_arge;
 418         va_copy_expression_t                  va_copye;
 419         conditional_expression_t              conditional;
 420         statement_expression_t                statement;
 421         classify_type_expression_t            classify_type;
 422         label_address_expression_t            label_address;
 423 };
 424
 425 typedef enum initializer_kind_t {
 426         INITIALIZER_VALUE,
 427         INITIALIZER_LIST,
 428         INITIALIZER_STRING,
 429         INITIALIZER_WIDE_STRING,
 430         INITIALIZER_DESIGNATOR
 431 } initializer_kind_t;
 432
 433 struct initializer_base_t {
 434         initializer_kind_t kind;
 435 };
 436
 437 struct initializer_value_t {
 438         initializer_base_t  base;
 439         expression_t       *value;
 440 };
 441
 442 struct initializer_list_t {
 443         initializer_base_t  base;
 444         size_t              len;
 445         initializer_t      *initializers[];
 446 };
 447
 448 struct initializer_string_t {
 449         initializer_base_t base;
 450         string_t           string;
 451 };
 452
 453 struct initializer_wide_string_t {
 454         initializer_base_t  base;
 455         string_t            string;
 456 };
 457
 458 struct initializer_designator_t {
 459         initializer_base_t  base;
 460         designator_t       *designator;
 461 };
 462
 463 union initializer_t {
 464         initializer_kind_t        kind;
 465         initializer_base_t        base;
 466         initializer_value_t       value;
 467         initializer_list_t        list;
 468         initializer_string_t      string;
 469         initializer_wide_string_t wide_string;
 470         initializer_designator_t  designator;
 471 };
 472
 473 /**
 474  * The statement kinds.
 475  */
 476 typedef enum statement_kind_t {
 477         STATEMENT_ERROR = 1,
 478         STATEMENT_EMPTY,
 479         STATEMENT_COMPOUND,
 480         STATEMENT_RETURN,
 481         STATEMENT_DECLARATION,
 482         STATEMENT_IF,
 483         STATEMENT_SWITCH,
 484         STATEMENT_EXPRESSION,
 485         STATEMENT_CONTINUE,
 486         STATEMENT_BREAK,
 487         STATEMENT_COMPUTED_GOTO,
 488         STATEMENT_GOTO,
 489         STATEMENT_LABEL,
 490         STATEMENT_CASE_LABEL,
 491         STATEMENT_WHILE,
 492         STATEMENT_DO_WHILE,
 493         STATEMENT_FOR,
 494         STATEMENT_ASM,
 495         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 496         STATEMENT_LEAVE            /**< MS __leave */
 497 } statement_kind_t;
 498
 499 /**
 500  * The base class of every statement.
 501  */
 502 struct statement_base_t {
 503         statement_kind_t   kind;
 504         statement_t       *next;         /**< Point to the next statement in a compound statement. */
 505         source_position_t  source_position;
 506         statement_t       *parent;       /**< The Parent statement that controls the execution. */
 507         bool               reachable;    /**< True, if this statement is reachable. */
 508 #ifndef NDEBUG
 509         bool               transformed;
 510 #endif
 511 };
 512
 513 struct return_statement_t {
 514         statement_base_t  base;
 515         expression_t     *value;    /**< The return value if any. */
 516 };
 517
 518 struct compound_statement_t {
 519         statement_base_t  base;
 520         statement_t      *statements;
 521         scope_t           scope;
 522         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 523 };
 524
 525 struct declaration_statement_t {
 526         statement_base_t  base;
 527         entity_t         *declarations_begin;
 528         entity_t         *declarations_end;
 529 };
 530
 531 struct if_statement_t {
 532         statement_base_t  base;
 533         scope_t           scope;
 534         expression_t     *condition;
 535         statement_t      *true_statement;
 536         statement_t      *false_statement;
 537 };
 538
 539 struct switch_statement_t {
 540         statement_base_t        base;
 541         scope_t                 scope;
 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 };
 547
 548 struct goto_statement_t {
 549         statement_base_t  base;
 550         label_t          *label;         /**< The destination label. */
 551         goto_statement_t *next;          /**< links all goto statements of a function */
 552 };
 553
 554 struct computed_goto_statement_t {
 555         statement_base_t  base;
 556         expression_t     *expression; /**< The expression for the computed goto. */
 557 };
 558
 559 struct case_label_statement_t {
 560         statement_base_t        base;
 561         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 562         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 563         case_label_statement_t *next;          /**< link to the next case label in switch */
 564         statement_t            *statement;
 565         long                   first_case;     /**< The folded value of expression. */
 566         long                   last_case;      /**< The folded value of end_range. */
 567         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 568         bool                   is_empty_range; /**< If set marked this as an empty range. */
 569         long                   pn;
 570 };
 571
 572 struct label_statement_t {
 573         statement_base_t   base;
 574         label_t           *label;
 575         statement_t       *statement;
 576         label_statement_t *next;    /**< links all label statements of a function */
 577 };
 578
 579 struct expression_statement_t {
 580         statement_base_t  base;
 581         expression_t     *expression;
 582 };
 583
 584 struct while_statement_t {
 585         statement_base_t  base;
 586         scope_t           scope;
 587         expression_t     *condition;
 588         statement_t      *body;
 589 };
 590
 591 struct do_while_statement_t {
 592         statement_base_t  base;
 593         scope_t           scope;
 594         expression_t     *condition;
 595         statement_t      *body;
 596 };
 597
 598 struct for_statement_t {
 599         statement_base_t  base;
 600         scope_t           scope;
 601         expression_t     *initialisation;
 602         expression_t     *condition;
 603         expression_t     *step;
 604         statement_t      *body;
 605         bool              condition_reachable:1;
 606         bool              step_reachable:1;
 607 };
 608
 609 struct asm_argument_t {
 610         string_t        constraints;
 611         expression_t   *expression;
 612         symbol_t       *symbol;
 613         asm_argument_t *next;
 614 };
 615
 616 struct asm_clobber_t {
 617         string_t       clobber;
 618         asm_clobber_t *next;
 619 };
 620
 621 struct asm_statement_t {
 622         statement_base_t base;
 623         string_t         asm_text;
 624         asm_argument_t  *inputs;
 625         asm_argument_t  *outputs;
 626         asm_clobber_t   *clobbers;
 627         bool             is_volatile;
 628 };
 629
 630 struct ms_try_statement_t {
 631         statement_base_t  base;
 632         statement_t      *try_statement;
 633         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 634         statement_t      *final_statement;
 635 };
 636
 637 struct leave_statement_t {
 638         statement_base_t  base;
 639 };
 640
 641 union statement_t {
 642         statement_kind_t          kind;
 643         statement_base_t          base;
 644         return_statement_t        returns;
 645         compound_statement_t      compound;
 646         declaration_statement_t   declaration;
 647         if_statement_t            ifs;
 648         switch_statement_t        switchs;
 649         computed_goto_statement_t computed_goto;
 650         goto_statement_t          gotos;
 651         case_label_statement_t    case_label;
 652         label_statement_t         label;
 653         expression_statement_t    expression;
 654         while_statement_t         whiles;
 655         do_while_statement_t      do_while;
 656         for_statement_t           fors;
 657         asm_statement_t           asms;
 658         ms_try_statement_t        ms_try;
 659         leave_statement_t         leave;
 660 };
 661
 662 struct translation_unit_t {
 663         scope_t      scope;
 664         statement_t *global_asm;
 665 };
 666
 667 /**
 668  * Allocate an AST node with given size and
 669  * initialize all fields with zero.
 670  */
 671 static inline void *allocate_ast_zero(size_t size)
 672 {
 673         return memset(obstack_alloc(&ast_obstack, size), 0, size);
 674 }
 675
 676 /** If set, implicit casts are printed. */
 677 extern bool print_implicit_casts;
 678 /** If set parenthesis are printed to indicate operator precedence. */
 679 extern bool print_parenthesis;
 680
 681 #endif