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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_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_COMPLEMENT,
  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_REAL,
 110         EXPR_UNARY_IMAG,
 111         EXPR_UNARY_LAST = EXPR_UNARY_IMAG,
 112
 113         EXPR_BINARY_FIRST,
 114         EXPR_BINARY_ADD = EXPR_BINARY_FIRST,
 115         EXPR_BINARY_SUB,
 116         EXPR_BINARY_MUL,
 117         EXPR_BINARY_DIV,
 118         EXPR_BINARY_MOD,
 119         EXPR_BINARY_EQUAL,
 120         EXPR_BINARY_NOTEQUAL,
 121         EXPR_BINARY_LESS,
 122         EXPR_BINARY_LESSEQUAL,
 123         EXPR_BINARY_GREATER,
 124         EXPR_BINARY_GREATEREQUAL,
 125         EXPR_BINARY_BITWISE_AND,
 126         EXPR_BINARY_BITWISE_OR,
 127         EXPR_BINARY_BITWISE_XOR,
 128         EXPR_BINARY_LOGICAL_AND,
 129         EXPR_BINARY_LOGICAL_OR,
 130         EXPR_BINARY_SHIFTLEFT,
 131         EXPR_BINARY_SHIFTRIGHT,
 132         EXPR_BINARY_ASSIGN,
 133         EXPR_BINARY_MUL_ASSIGN,
 134         EXPR_BINARY_DIV_ASSIGN,
 135         EXPR_BINARY_MOD_ASSIGN,
 136         EXPR_BINARY_ADD_ASSIGN,
 137         EXPR_BINARY_SUB_ASSIGN,
 138         EXPR_BINARY_SHIFTLEFT_ASSIGN,
 139         EXPR_BINARY_SHIFTRIGHT_ASSIGN,
 140         EXPR_BINARY_BITWISE_AND_ASSIGN,
 141         EXPR_BINARY_BITWISE_XOR_ASSIGN,
 142         EXPR_BINARY_BITWISE_OR_ASSIGN,
 143         EXPR_BINARY_COMMA,
 144
 145         EXPR_BINARY_ISGREATER,
 146         EXPR_BINARY_ISGREATEREQUAL,
 147         EXPR_BINARY_ISLESS,
 148         EXPR_BINARY_ISLESSEQUAL,
 149         EXPR_BINARY_ISLESSGREATER,
 150         EXPR_BINARY_ISUNORDERED,
 151         EXPR_BINARY_LAST = EXPR_BINARY_ISUNORDERED,
 152 } expression_kind_t;
 153
 154 typedef enum funcname_kind_t {
 155         FUNCNAME_FUNCTION,           /**< C99 __func__, older __FUNCTION__ */
 156         FUNCNAME_PRETTY_FUNCTION,    /**< GNUC __PRETTY_FUNCTION__ */
 157         FUNCNAME_FUNCSIG,            /**< MS __FUNCSIG__ */
 158         FUNCNAME_FUNCDNAME           /**< MS __FUNCDNAME__ */
 159 } funcname_kind_t;
 160
 161 /* convenience macros */
 162 #define EXPR_BINARY_CASES              \
 163              EXPR_BINARY_ADD:                \
 164         case EXPR_BINARY_SUB:                \
 165         case EXPR_BINARY_MUL:                \
 166         case EXPR_BINARY_DIV:                \
 167         case EXPR_BINARY_MOD:                \
 168         case EXPR_BINARY_EQUAL:              \
 169         case EXPR_BINARY_NOTEQUAL:           \
 170         case EXPR_BINARY_LESS:               \
 171         case EXPR_BINARY_LESSEQUAL:          \
 172         case EXPR_BINARY_GREATER:            \
 173         case EXPR_BINARY_GREATEREQUAL:       \
 174         case EXPR_BINARY_BITWISE_AND:        \
 175         case EXPR_BINARY_BITWISE_OR:         \
 176         case EXPR_BINARY_BITWISE_XOR:        \
 177         case EXPR_BINARY_LOGICAL_AND:        \
 178         case EXPR_BINARY_LOGICAL_OR:         \
 179         case EXPR_BINARY_SHIFTLEFT:          \
 180         case EXPR_BINARY_SHIFTRIGHT:         \
 181         case EXPR_BINARY_ASSIGN:             \
 182         case EXPR_BINARY_MUL_ASSIGN:         \
 183         case EXPR_BINARY_DIV_ASSIGN:         \
 184         case EXPR_BINARY_MOD_ASSIGN:         \
 185         case EXPR_BINARY_ADD_ASSIGN:         \
 186         case EXPR_BINARY_SUB_ASSIGN:         \
 187         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   \
 188         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  \
 189         case EXPR_BINARY_BITWISE_AND_ASSIGN: \
 190         case EXPR_BINARY_BITWISE_XOR_ASSIGN: \
 191         case EXPR_BINARY_BITWISE_OR_ASSIGN:  \
 192         case EXPR_BINARY_COMMA:              \
 193         case EXPR_BINARY_ISGREATER:          \
 194         case EXPR_BINARY_ISGREATEREQUAL:     \
 195         case EXPR_BINARY_ISLESS:             \
 196         case EXPR_BINARY_ISLESSEQUAL:        \
 197         case EXPR_BINARY_ISLESSGREATER:      \
 198         case EXPR_BINARY_ISUNORDERED
 199
 200 /**
 201  * unary expression with mandatory operand
 202  */
 203 #define EXPR_UNARY_CASES_MANDATORY   \
 204              EXPR_UNARY_NEGATE:            \
 205         case EXPR_UNARY_PLUS:              \
 206         case EXPR_UNARY_COMPLEMENT:        \
 207         case EXPR_UNARY_NOT:               \
 208         case EXPR_UNARY_DEREFERENCE:       \
 209         case EXPR_UNARY_TAKE_ADDRESS:      \
 210         case EXPR_UNARY_POSTFIX_INCREMENT: \
 211         case EXPR_UNARY_POSTFIX_DECREMENT: \
 212         case EXPR_UNARY_PREFIX_INCREMENT:  \
 213         case EXPR_UNARY_PREFIX_DECREMENT:  \
 214         case EXPR_UNARY_CAST:              \
 215         case EXPR_UNARY_ASSUME:            \
 216         case EXPR_UNARY_DELETE:            \
 217         case EXPR_UNARY_DELETE_ARRAY:      \
 218         case EXPR_UNARY_IMAG:              \
 219         case EXPR_UNARY_REAL
 220
 221 /**
 222  * unary expression with optional operand
 223  */
 224 #define EXPR_UNARY_CASES_OPTIONAL \
 225         EXPR_UNARY_THROW
 226
 227 #define EXPR_UNARY_CASES           \
 228              EXPR_UNARY_CASES_MANDATORY: \
 229         case EXPR_UNARY_CASES_OPTIONAL
 230
 231 #define EXPR_LITERAL_CASES                     \
 232              EXPR_LITERAL_BOOLEAN:                   \
 233         case EXPR_LITERAL_INTEGER:                   \
 234         case EXPR_LITERAL_FLOATINGPOINT:             \
 235         case EXPR_LITERAL_MS_NOOP
 236
 237 /**
 238  * The base class of every expression.
 239  */
 240 struct expression_base_t {
 241         expression_kind_t kind;     /**< The expression kind. */
 242         type_t           *type;     /**< The type of the expression. */
 243         position_t        pos;      /**< The source position of this expression. */
 244         bool              parenthesized : 1;
 245 #ifndef NDEBUG
 246         bool              transformed : 1; /**< Set if this expression was transformed. */
 247 #endif
 248         bool              implicit : 1;  /**< compiler generated expression.
 249                                             Examples: select into anonymous structs,
 250                                             implicit casts */
 251 };
 252
 253 /**
 254  * integer, float and boolean constants
 255  */
 256 struct literal_expression_t {
 257         expression_base_t base;
 258         string_t          value;
 259         char const       *suffix; /**< Start of the suffix in value. */
 260
 261         /* ast2firm data */
 262         ir_tarval        *target_value;
 263 };
 264
 265 /**
 266  * string and character literals
 267  */
 268 struct string_literal_expression_t {
 269         expression_base_t base;
 270         string_t          value;
 271 };
 272
 273 struct funcname_expression_t {
 274         expression_base_t  base;
 275         funcname_kind_t    kind;
 276 };
 277
 278 struct compound_literal_expression_t {
 279         expression_base_t  base;
 280         type_t            *type;
 281         initializer_t     *initializer;
 282         bool               global_scope;
 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         position_t    pos;
 349         symbol_t     *symbol;      /**< the symbol if any */
 350         expression_t *array_index; /**< the array index if any */
 351         expression_t *range_last;  /**< last index of a range initializer, 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         expression_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_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_designator_t {
 449         initializer_base_t  base;
 450         designator_t       *designator;
 451 };
 452
 453 union initializer_t {
 454         initializer_kind_t        kind;
 455         initializer_base_t        base;
 456         initializer_value_t       value;
 457         initializer_list_t        list;
 458         initializer_designator_t  designator;
 459 };
 460
 461 static inline string_literal_expression_t const *get_init_string(initializer_t const *const init)
 462 {
 463         assert(init->kind == INITIALIZER_STRING);
 464         assert(init->value.value->kind == EXPR_STRING_LITERAL);
 465         return &init->value.value->string_literal;
 466 }
 467
 468 /**
 469  * The statement kinds.
 470  */
 471 typedef enum statement_kind_t {
 472         STATEMENT_ERROR = 1,
 473         STATEMENT_EMPTY,
 474         STATEMENT_COMPOUND,
 475         STATEMENT_RETURN,
 476         STATEMENT_DECLARATION,
 477         STATEMENT_IF,
 478         STATEMENT_SWITCH,
 479         STATEMENT_EXPRESSION,
 480         STATEMENT_CONTINUE,
 481         STATEMENT_BREAK,
 482         STATEMENT_COMPUTED_GOTO,
 483         STATEMENT_GOTO,
 484         STATEMENT_LABEL,
 485         STATEMENT_CASE_LABEL,
 486         STATEMENT_DO_WHILE,
 487         STATEMENT_FOR,
 488         STATEMENT_ASM,
 489         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 490         STATEMENT_LEAVE            /**< MS __leave */
 491 } statement_kind_t;
 492
 493 /**
 494  * The base class of every statement.
 495  */
 496 struct statement_base_t {
 497         statement_kind_t kind;
 498         statement_t     *next;      /**< Point to the next statement in a compound statement. */
 499         position_t       pos;
 500         statement_t     *parent;    /**< The Parent statement that controls the execution. */
 501         bool             reachable; /**< True, if this statement is reachable. */
 502 #ifndef NDEBUG
 503         bool             transformed;
 504 #endif
 505 };
 506
 507 struct return_statement_t {
 508         statement_base_t  base;
 509         expression_t     *value;    /**< The return value if any. */
 510 };
 511
 512 struct compound_statement_t {
 513         statement_base_t  base;
 514         statement_t      *statements;
 515         scope_t           scope;
 516         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 517 };
 518
 519 struct declaration_statement_t {
 520         statement_base_t  base;
 521         entity_t         *declarations_begin;
 522         entity_t         *declarations_end;
 523 };
 524
 525 struct if_statement_t {
 526         statement_base_t  base;
 527         scope_t           scope;
 528         expression_t     *condition;
 529         statement_t      *true_statement;
 530         statement_t      *false_statement;
 531 };
 532
 533 struct switch_statement_t {
 534         statement_base_t        base;
 535         scope_t                 scope;
 536         expression_t           *expression;
 537         statement_t            *body;
 538         case_label_statement_t *first_case, *last_case; /**< List of all cases, including default. */
 539         case_label_statement_t *default_label;          /**< The default label if existent. */
 540 };
 541
 542 struct goto_statement_t {
 543         statement_base_t  base;
 544         label_t          *label;         /**< The destination label. */
 545         goto_statement_t *next;          /**< links all goto statements of a function */
 546 };
 547
 548 struct computed_goto_statement_t {
 549         statement_base_t  base;
 550         expression_t     *expression; /**< The expression for the computed goto. */
 551 };
 552
 553 struct case_label_statement_t {
 554         statement_base_t        base;
 555         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 556         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 557         case_label_statement_t *next;          /**< link to the next case label in switch */
 558         statement_t            *statement;
 559         ir_tarval              *first_case;
 560         ir_tarval              *last_case;
 561         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 562         bool                   is_empty_range; /**< If set marked this as an empty range. */
 563         long                   pn;
 564 };
 565
 566 struct label_statement_t {
 567         statement_base_t   base;
 568         label_t           *label;
 569         statement_t       *statement;
 570         label_statement_t *next;    /**< links all label statements of a function */
 571 };
 572
 573 struct expression_statement_t {
 574         statement_base_t  base;
 575         expression_t     *expression;
 576 };
 577
 578 struct do_while_statement_t {
 579         statement_base_t  base;
 580         scope_t           scope;
 581         expression_t     *condition;
 582         statement_t      *body;
 583 };
 584
 585 struct for_statement_t {
 586         statement_base_t  base;
 587         scope_t           scope;
 588         expression_t     *initialisation;
 589         expression_t     *condition;
 590         expression_t     *step;
 591         statement_t      *body;
 592         bool              condition_reachable:1;
 593         bool              step_reachable:1;
 594 };
 595
 596 struct asm_argument_t {
 597         string_t        constraints;
 598         expression_t   *expression;
 599         symbol_t       *symbol;
 600         asm_argument_t *next;
 601 };
 602
 603 struct asm_clobber_t {
 604         string_t       clobber;
 605         asm_clobber_t *next;
 606 };
 607
 608 struct asm_label_t {
 609         label_t     *label;
 610         asm_label_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         asm_label_t     *labels;
 620         bool             is_volatile;
 621 };
 622
 623 struct ms_try_statement_t {
 624         statement_base_t  base;
 625         statement_t      *try_statement;
 626         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 627         statement_t      *final_statement;
 628 };
 629
 630 struct leave_statement_t {
 631         statement_base_t  base;
 632 };
 633
 634 union statement_t {
 635         statement_kind_t          kind;
 636         statement_base_t          base;
 637         return_statement_t        returns;
 638         compound_statement_t      compound;
 639         declaration_statement_t   declaration;
 640         if_statement_t            ifs;
 641         switch_statement_t        switchs;
 642         computed_goto_statement_t computed_goto;
 643         goto_statement_t          gotos;
 644         case_label_statement_t    case_label;
 645         label_statement_t         label;
 646         expression_statement_t    expression;
 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