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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_FLOATINGPOINT_HEXADECIMAL,
  72         EXPR_LITERAL_CHARACTER,
  73         EXPR_LITERAL_WIDE_CHARACTER,
  74         EXPR_LITERAL_MS_NOOP, /**< MS __noop extension */
  75         EXPR_STRING_LITERAL,
  76         EXPR_WIDE_STRING_LITERAL,
  77         EXPR_COMPOUND_LITERAL,
  78         EXPR_CALL,
  79         EXPR_CONDITIONAL,
  80         EXPR_SELECT,
  81         EXPR_ARRAY_ACCESS,
  82         EXPR_SIZEOF,
  83         EXPR_CLASSIFY_TYPE,
  84         EXPR_ALIGNOF,
  85
  86         EXPR_FUNCNAME,
  87         EXPR_BUILTIN_CONSTANT_P,
  88         EXPR_BUILTIN_TYPES_COMPATIBLE_P,
  89         EXPR_OFFSETOF,
  90         EXPR_VA_START,
  91         EXPR_VA_ARG,
  92         EXPR_VA_COPY,
  93         EXPR_STATEMENT,
  94         EXPR_LABEL_ADDRESS, /**< GCC extension &&label operator */
  95
  96         EXPR_UNARY_FIRST,
  97         EXPR_UNARY_NEGATE = EXPR_UNARY_FIRST,
  98         EXPR_UNARY_PLUS,
  99         EXPR_UNARY_BITWISE_NEGATE,
 100         EXPR_UNARY_NOT,
 101         EXPR_UNARY_DEREFERENCE,
 102         EXPR_UNARY_TAKE_ADDRESS,
 103         EXPR_UNARY_POSTFIX_INCREMENT,
 104         EXPR_UNARY_POSTFIX_DECREMENT,
 105         EXPR_UNARY_PREFIX_INCREMENT,
 106         EXPR_UNARY_PREFIX_DECREMENT,
 107         EXPR_UNARY_CAST,
 108         EXPR_UNARY_ASSUME,        /**< MS __assume() */
 109         EXPR_UNARY_DELETE,
 110         EXPR_UNARY_DELETE_ARRAY,
 111         EXPR_UNARY_THROW,
 112         EXPR_UNARY_LAST = EXPR_UNARY_THROW,
 113
 114         EXPR_BINARY_FIRST,
 115         EXPR_BINARY_ADD = EXPR_BINARY_FIRST,
 116         EXPR_BINARY_SUB,
 117         EXPR_BINARY_MUL,
 118         EXPR_BINARY_DIV,
 119         EXPR_BINARY_MOD,
 120         EXPR_BINARY_EQUAL,
 121         EXPR_BINARY_NOTEQUAL,
 122         EXPR_BINARY_LESS,
 123         EXPR_BINARY_LESSEQUAL,
 124         EXPR_BINARY_GREATER,
 125         EXPR_BINARY_GREATEREQUAL,
 126         EXPR_BINARY_BITWISE_AND,
 127         EXPR_BINARY_BITWISE_OR,
 128         EXPR_BINARY_BITWISE_XOR,
 129         EXPR_BINARY_LOGICAL_AND,
 130         EXPR_BINARY_LOGICAL_OR,
 131         EXPR_BINARY_SHIFTLEFT,
 132         EXPR_BINARY_SHIFTRIGHT,
 133         EXPR_BINARY_ASSIGN,
 134         EXPR_BINARY_MUL_ASSIGN,
 135         EXPR_BINARY_DIV_ASSIGN,
 136         EXPR_BINARY_MOD_ASSIGN,
 137         EXPR_BINARY_ADD_ASSIGN,
 138         EXPR_BINARY_SUB_ASSIGN,
 139         EXPR_BINARY_SHIFTLEFT_ASSIGN,
 140         EXPR_BINARY_SHIFTRIGHT_ASSIGN,
 141         EXPR_BINARY_BITWISE_AND_ASSIGN,
 142         EXPR_BINARY_BITWISE_XOR_ASSIGN,
 143         EXPR_BINARY_BITWISE_OR_ASSIGN,
 144         EXPR_BINARY_COMMA,
 145
 146         EXPR_BINARY_ISGREATER,
 147         EXPR_BINARY_ISGREATEREQUAL,
 148         EXPR_BINARY_ISLESS,
 149         EXPR_BINARY_ISLESSEQUAL,
 150         EXPR_BINARY_ISLESSGREATER,
 151         EXPR_BINARY_ISUNORDERED,
 152         EXPR_BINARY_LAST = EXPR_BINARY_ISUNORDERED,
 153 } expression_kind_t;
 154
 155 typedef enum funcname_kind_t {
 156         FUNCNAME_FUNCTION,           /**< C99 __func__, older __FUNCTION__ */
 157         FUNCNAME_PRETTY_FUNCTION,    /**< GNUC __PRETTY_FUNCTION__ */
 158         FUNCNAME_FUNCSIG,            /**< MS __FUNCSIG__ */
 159         FUNCNAME_FUNCDNAME           /**< MS __FUNCDNAME__ */
 160 } funcname_kind_t;
 161
 162 /* convenience macros */
 163 #define EXPR_BINARY_CASES              \
 164              EXPR_BINARY_ADD:                \
 165         case EXPR_BINARY_SUB:                \
 166         case EXPR_BINARY_MUL:                \
 167         case EXPR_BINARY_DIV:                \
 168         case EXPR_BINARY_MOD:                \
 169         case EXPR_BINARY_EQUAL:              \
 170         case EXPR_BINARY_NOTEQUAL:           \
 171         case EXPR_BINARY_LESS:               \
 172         case EXPR_BINARY_LESSEQUAL:          \
 173         case EXPR_BINARY_GREATER:            \
 174         case EXPR_BINARY_GREATEREQUAL:       \
 175         case EXPR_BINARY_BITWISE_AND:        \
 176         case EXPR_BINARY_BITWISE_OR:         \
 177         case EXPR_BINARY_BITWISE_XOR:        \
 178         case EXPR_BINARY_LOGICAL_AND:        \
 179         case EXPR_BINARY_LOGICAL_OR:         \
 180         case EXPR_BINARY_SHIFTLEFT:          \
 181         case EXPR_BINARY_SHIFTRIGHT:         \
 182         case EXPR_BINARY_ASSIGN:             \
 183         case EXPR_BINARY_MUL_ASSIGN:         \
 184         case EXPR_BINARY_DIV_ASSIGN:         \
 185         case EXPR_BINARY_MOD_ASSIGN:         \
 186         case EXPR_BINARY_ADD_ASSIGN:         \
 187         case EXPR_BINARY_SUB_ASSIGN:         \
 188         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   \
 189         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  \
 190         case EXPR_BINARY_BITWISE_AND_ASSIGN: \
 191         case EXPR_BINARY_BITWISE_XOR_ASSIGN: \
 192         case EXPR_BINARY_BITWISE_OR_ASSIGN:  \
 193         case EXPR_BINARY_COMMA:              \
 194         case EXPR_BINARY_ISGREATER:          \
 195         case EXPR_BINARY_ISGREATEREQUAL:     \
 196         case EXPR_BINARY_ISLESS:             \
 197         case EXPR_BINARY_ISLESSEQUAL:        \
 198         case EXPR_BINARY_ISLESSGREATER:      \
 199         case EXPR_BINARY_ISUNORDERED
 200
 201 /**
 202  * unary expression with mandatory operand
 203  */
 204 #define EXPR_UNARY_CASES_MANDATORY   \
 205              EXPR_UNARY_NEGATE:            \
 206         case EXPR_UNARY_PLUS:              \
 207         case EXPR_UNARY_BITWISE_NEGATE:    \
 208         case EXPR_UNARY_NOT:               \
 209         case EXPR_UNARY_DEREFERENCE:       \
 210         case EXPR_UNARY_TAKE_ADDRESS:      \
 211         case EXPR_UNARY_POSTFIX_INCREMENT: \
 212         case EXPR_UNARY_POSTFIX_DECREMENT: \
 213         case EXPR_UNARY_PREFIX_INCREMENT:  \
 214         case EXPR_UNARY_PREFIX_DECREMENT:  \
 215         case EXPR_UNARY_CAST:              \
 216         case EXPR_UNARY_ASSUME:            \
 217         case EXPR_UNARY_DELETE:            \
 218         case EXPR_UNARY_DELETE_ARRAY
 219
 220 /**
 221  * unary expression with optional operand
 222  */
 223 #define EXPR_UNARY_CASES_OPTIONAL \
 224         EXPR_UNARY_THROW
 225
 226 #define EXPR_UNARY_CASES           \
 227              EXPR_UNARY_CASES_MANDATORY: \
 228         case EXPR_UNARY_CASES_OPTIONAL
 229
 230 #define EXPR_LITERAL_CASES                     \
 231              EXPR_LITERAL_BOOLEAN:                   \
 232         case EXPR_LITERAL_INTEGER:                   \
 233         case EXPR_LITERAL_FLOATINGPOINT:             \
 234         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: \
 235         case EXPR_LITERAL_CHARACTER:                 \
 236         case EXPR_LITERAL_WIDE_CHARACTER:            \
 237         case EXPR_LITERAL_MS_NOOP
 238
 239 /**
 240  * The base class of every expression.
 241  */
 242 struct expression_base_t {
 243         expression_kind_t   kind;            /**< The expression kind. */
 244         type_t             *type;            /**< The type of the expression. */
 245         source_position_t   source_position; /**< The source position of this expression. */
 246         bool                parenthesized : 1;
 247 #ifndef NDEBUG
 248         bool                transformed : 1;     /**< Set if this expression was transformed. */
 249 #endif
 250         bool                implicit : 1;    /**< compiler generated expression.
 251                                                   Examples:
 252                                                      select into anonymous structs
 253                                                      implicit casts
 254                                               */
 255 };
 256
 257 /**
 258  * integer/float constants, character and string literals
 259  */
 260 struct literal_expression_t {
 261         expression_base_t  base;
 262         string_t           value;
 263         string_t           suffix;
 264
 265         /* ast2firm data */
 266         ir_tarval         *target_value;
 267 };
 268
 269 struct string_literal_expression_t {
 270         expression_base_t  base;
 271         string_t           value;
 272 };
 273
 274 struct funcname_expression_t {
 275         expression_base_t  base;
 276         funcname_kind_t    kind;
 277         string_t           value;     /**< the value once assigned. */
 278 };
 279
 280 struct compound_literal_expression_t {
 281         expression_base_t  base;
 282         type_t            *type;
 283         initializer_t     *initializer;
 284 };
 285
 286 struct builtin_constant_expression_t {
 287         expression_base_t  base;
 288         expression_t      *value;
 289 };
 290
 291 struct builtin_types_compatible_expression_t {
 292         expression_base_t  base;
 293         type_t            *left;
 294         type_t            *right;
 295 };
 296
 297 struct reference_expression_t {
 298         expression_base_t  base;
 299         entity_t          *entity;
 300 };
 301
 302 /**
 303  * An argument of a call.
 304  */
 305 struct call_argument_t {
 306         expression_t    *expression;  /**< The expression which value is transmitted. */
 307         call_argument_t *next;        /**< Links to the next argument of this call. */
 308 };
 309
 310
 311 struct call_expression_t {
 312         expression_base_t  base;
 313         expression_t      *function;  /**< The address of the function to call. */
 314         call_argument_t   *arguments; /**< List of arguments of this call. */
 315 };
 316
 317
 318 struct unary_expression_t {
 319         expression_base_t  base;
 320         expression_t      *value;     /**< The unary operand. */
 321 };
 322
 323 struct binary_expression_t {
 324         expression_base_t  base;
 325         expression_t      *left;
 326         expression_t      *right;
 327 };
 328
 329 struct select_expression_t {
 330         expression_base_t  base;
 331         expression_t      *compound;
 332         entity_t          *compound_entry;
 333 };
 334
 335 struct array_access_expression_t {
 336         expression_base_t  base;
 337         expression_t      *array_ref; /**< the referenced array */
 338         expression_t      *index;     /**< the index used */
 339         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 340 };
 341
 342 struct typeprop_expression_t {
 343         expression_base_t  base;
 344         type_t            *type;
 345         expression_t      *tp_expression;
 346 };
 347
 348 struct designator_t {
 349         source_position_t  source_position;
 350         symbol_t          *symbol;      /**< the symbol if any */
 351         expression_t      *array_index; /**< the array index if any */
 352         designator_t      *next;
 353 };
 354
 355 struct offsetof_expression_t {
 356         expression_base_t  base;
 357         type_t            *type;
 358         designator_t      *designator;
 359 };
 360
 361 struct va_start_expression_t {
 362         expression_base_t  base;
 363         expression_t      *ap;
 364         variable_t        *parameter;
 365 };
 366
 367 struct va_arg_expression_t {
 368         expression_base_t  base;
 369         expression_t      *ap;
 370 };
 371
 372 struct va_copy_expression_t {
 373         expression_base_t  base;
 374         expression_t      *dst;    /**< destination argument */
 375         expression_t      *src;    /**< source argument */
 376 };
 377
 378 struct conditional_expression_t {
 379         expression_base_t  base;
 380         expression_t      *condition;
 381         expression_t      *true_expression;
 382         expression_t      *false_expression;
 383 };
 384
 385 struct statement_expression_t {
 386         expression_base_t  base;
 387         statement_t       *statement;
 388 };
 389
 390 struct classify_type_expression_t {
 391         expression_base_t  base;
 392         expression_t      *type_expression;
 393 };
 394
 395 struct label_address_expression_t {
 396         expression_base_t  base;
 397         label_t           *label;
 398 };
 399
 400 union expression_t {
 401         expression_kind_t                     kind;
 402         expression_base_t                     base;
 403         literal_expression_t                  literal;
 404         string_literal_expression_t           string_literal;
 405         funcname_expression_t                 funcname;
 406         compound_literal_expression_t         compound_literal;
 407         builtin_constant_expression_t         builtin_constant;
 408         builtin_types_compatible_expression_t builtin_types_compatible;
 409         reference_expression_t                reference;
 410         call_expression_t                     call;
 411         unary_expression_t                    unary;
 412         binary_expression_t                   binary;
 413         select_expression_t                   select;
 414         array_access_expression_t             array_access;
 415         typeprop_expression_t                 typeprop;
 416         offsetof_expression_t                 offsetofe;
 417         va_start_expression_t                 va_starte;
 418         va_arg_expression_t                   va_arge;
 419         va_copy_expression_t                  va_copye;
 420         conditional_expression_t              conditional;
 421         statement_expression_t                statement;
 422         classify_type_expression_t            classify_type;
 423         label_address_expression_t            label_address;
 424 };
 425
 426 typedef enum initializer_kind_t {
 427         INITIALIZER_VALUE,
 428         INITIALIZER_LIST,
 429         INITIALIZER_STRING,
 430         INITIALIZER_WIDE_STRING,
 431         INITIALIZER_DESIGNATOR
 432 } initializer_kind_t;
 433
 434 struct initializer_base_t {
 435         initializer_kind_t kind;
 436 };
 437
 438 struct initializer_value_t {
 439         initializer_base_t  base;
 440         expression_t       *value;
 441 };
 442
 443 struct initializer_list_t {
 444         initializer_base_t  base;
 445         size_t              len;
 446         initializer_t      *initializers[];
 447 };
 448
 449 struct initializer_string_t {
 450         initializer_base_t base;
 451         string_t           string;
 452 };
 453
 454 struct initializer_wide_string_t {
 455         initializer_base_t  base;
 456         string_t            string;
 457 };
 458
 459 struct initializer_designator_t {
 460         initializer_base_t  base;
 461         designator_t       *designator;
 462 };
 463
 464 union initializer_t {
 465         initializer_kind_t        kind;
 466         initializer_base_t        base;
 467         initializer_value_t       value;
 468         initializer_list_t        list;
 469         initializer_string_t      string;
 470         initializer_wide_string_t wide_string;
 471         initializer_designator_t  designator;
 472 };
 473
 474 /**
 475  * The statement kinds.
 476  */
 477 typedef enum statement_kind_t {
 478         STATEMENT_ERROR = 1,
 479         STATEMENT_EMPTY,
 480         STATEMENT_COMPOUND,
 481         STATEMENT_RETURN,
 482         STATEMENT_DECLARATION,
 483         STATEMENT_IF,
 484         STATEMENT_SWITCH,
 485         STATEMENT_EXPRESSION,
 486         STATEMENT_CONTINUE,
 487         STATEMENT_BREAK,
 488         STATEMENT_COMPUTED_GOTO,
 489         STATEMENT_GOTO,
 490         STATEMENT_LABEL,
 491         STATEMENT_CASE_LABEL,
 492         STATEMENT_WHILE,
 493         STATEMENT_DO_WHILE,
 494         STATEMENT_FOR,
 495         STATEMENT_ASM,
 496         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 497         STATEMENT_LEAVE            /**< MS __leave */
 498 } statement_kind_t;
 499
 500 /**
 501  * The base class of every statement.
 502  */
 503 struct statement_base_t {
 504         statement_kind_t   kind;
 505         statement_t       *next;         /**< Point to the next statement in a compound statement. */
 506         source_position_t  source_position;
 507         statement_t       *parent;       /**< The Parent statement that controls the execution. */
 508         bool               reachable;    /**< True, if this statement is reachable. */
 509 #ifndef NDEBUG
 510         bool               transformed;
 511 #endif
 512 };
 513
 514 struct return_statement_t {
 515         statement_base_t  base;
 516         expression_t     *value;    /**< The return value if any. */
 517 };
 518
 519 struct compound_statement_t {
 520         statement_base_t  base;
 521         statement_t      *statements;
 522         scope_t           scope;
 523         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 524 };
 525
 526 struct declaration_statement_t {
 527         statement_base_t  base;
 528         entity_t         *declarations_begin;
 529         entity_t         *declarations_end;
 530 };
 531
 532 struct if_statement_t {
 533         statement_base_t  base;
 534         scope_t           scope;
 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         scope_t                 scope;
 543         expression_t           *expression;
 544         statement_t            *body;
 545         case_label_statement_t *first_case, *last_case; /**< List of all cases, including default. */
 546         case_label_statement_t *default_label;          /**< The default label if existent. */
 547 };
 548
 549 struct goto_statement_t {
 550         statement_base_t  base;
 551         label_t          *label;         /**< The destination label. */
 552         goto_statement_t *next;          /**< links all goto statements of a function */
 553 };
 554
 555 struct computed_goto_statement_t {
 556         statement_base_t  base;
 557         expression_t     *expression; /**< The expression for the computed goto. */
 558 };
 559
 560 struct case_label_statement_t {
 561         statement_base_t        base;
 562         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 563         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 564         case_label_statement_t *next;          /**< link to the next case label in switch */
 565         statement_t            *statement;
 566         long                   first_case;     /**< The folded value of expression. */
 567         long                   last_case;      /**< The folded value of end_range. */
 568         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 569         bool                   is_empty_range; /**< If set marked this as an empty range. */
 570         long                   pn;
 571 };
 572
 573 struct label_statement_t {
 574         statement_base_t   base;
 575         label_t           *label;
 576         statement_t       *statement;
 577         label_statement_t *next;    /**< links all label statements of a function */
 578 };
 579
 580 struct expression_statement_t {
 581         statement_base_t  base;
 582         expression_t     *expression;
 583 };
 584
 585 struct while_statement_t {
 586         statement_base_t  base;
 587         scope_t           scope;
 588         expression_t     *condition;
 589         statement_t      *body;
 590 };
 591
 592 struct do_while_statement_t {
 593         statement_base_t  base;
 594         scope_t           scope;
 595         expression_t     *condition;
 596         statement_t      *body;
 597 };
 598
 599 struct for_statement_t {
 600         statement_base_t  base;
 601         scope_t           scope;
 602         expression_t     *initialisation;
 603         expression_t     *condition;
 604         expression_t     *step;
 605         statement_t      *body;
 606         bool              condition_reachable:1;
 607         bool              step_reachable:1;
 608 };
 609
 610 struct asm_argument_t {
 611         string_t        constraints;
 612         expression_t   *expression;
 613         symbol_t       *symbol;
 614         asm_argument_t *next;
 615 };
 616
 617 struct asm_clobber_t {
 618         string_t       clobber;
 619         asm_clobber_t *next;
 620 };
 621
 622 struct asm_statement_t {
 623         statement_base_t base;
 624         string_t         asm_text;
 625         asm_argument_t  *inputs;
 626         asm_argument_t  *outputs;
 627         asm_clobber_t   *clobbers;
 628         bool             is_volatile;
 629 };
 630
 631 struct ms_try_statement_t {
 632         statement_base_t  base;
 633         statement_t      *try_statement;
 634         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 635         statement_t      *final_statement;
 636 };
 637
 638 struct leave_statement_t {
 639         statement_base_t  base;
 640 };
 641
 642 union statement_t {
 643         statement_kind_t          kind;
 644         statement_base_t          base;
 645         return_statement_t        returns;
 646         compound_statement_t      compound;
 647         declaration_statement_t   declaration;
 648         if_statement_t            ifs;
 649         switch_statement_t        switchs;
 650         computed_goto_statement_t computed_goto;
 651         goto_statement_t          gotos;
 652         case_label_statement_t    case_label;
 653         label_statement_t         label;
 654         expression_statement_t    expression;
 655         while_statement_t         whiles;
 656         do_while_statement_t      do_while;
 657         for_statement_t           fors;
 658         asm_statement_t           asms;
 659         ms_try_statement_t        ms_try;
 660         leave_statement_t         leave;
 661 };
 662
 663 struct translation_unit_t {
 664         scope_t      scope;
 665         statement_t *global_asm;
 666 };
 667
 668 /**
 669  * Allocate an AST node with given size and
 670  * initialize all fields with zero.
 671  */
 672 static inline void *allocate_ast_zero(size_t size)
 673 {
 674         return memset(obstack_alloc(&ast_obstack, size), 0, size);
 675 }
 676
 677 /** If set, implicit casts are printed. */
 678 extern bool print_implicit_casts;
 679 /** If set parenthesis are printed to indicate operator precedence. */
 680 extern bool print_parenthesis;
 681
 682 #endif