nsz Git - cparser/blob - ast_t.h

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #ifndef AST_T_H
  21 #define AST_T_H
  22
  23 #include <libfirm/firm_types.h>
  24 #include <assert.h>
  25
  26 #include "ast.h"
  27 #include "symbol.h"
  28 #include "token_t.h"
  29 #include "type.h"
  30 #include "entity_t.h"
  31 #include "adt/obst.h"
  32
  33 /** The AST obstack contains all data that must stay in the AST. */
  34 extern struct obstack ast_obstack;
  35
  36 /**
  37  * Operator precedence classes
  38  */
  39 typedef enum precedence_t {
  40         PREC_BOTTOM,
  41         PREC_EXPRESSION,     /* ,                                  left to right */
  42         PREC_ASSIGNMENT,     /* = += -= *= /= %= <<= >>= &= ^= |=  right to left */
  43         PREC_CONDITIONAL,    /* ?:                                 right to left */
  44         PREC_LOGICAL_OR,     /* ||                                 left to right */
  45         PREC_LOGICAL_AND,    /* &&                                 left to right */
  46         PREC_OR,             /* |                                  left to right */
  47         PREC_XOR,            /* ^                                  left to right */
  48         PREC_AND,            /* &                                  left to right */
  49         PREC_EQUALITY,       /* == !=                              left to right */
  50         PREC_RELATIONAL,     /* < <= > >=                          left to right */
  51         PREC_SHIFT,          /* << >>                              left to right */
  52         PREC_ADDITIVE,       /* + -                                left to right */
  53         PREC_MULTIPLICATIVE, /* * / %                              left to right */
  54         PREC_CAST,           /* (type)                             right to left */
  55         PREC_UNARY,          /* ! ~ ++ -- + - * & sizeof           right to left */
  56         PREC_POSTFIX,        /* () [] -> .                         left to right */
  57         PREC_PRIMARY,
  58         PREC_TOP
  59 } precedence_t;
  60
  61 /**
  62  * Expression kinds.
  63  */
  64 typedef enum expression_kind_t {
  65         EXPR_ERROR = 1,
  66         EXPR_REFERENCE,
  67         EXPR_ENUM_CONSTANT,
  68         EXPR_LITERAL_BOOLEAN,
  69         EXPR_LITERAL_INTEGER,
  70         EXPR_LITERAL_FLOATINGPOINT,
  71         EXPR_LITERAL_CHARACTER,
  72         EXPR_LITERAL_MS_NOOP, /**< MS __noop extension */
  73         EXPR_STRING_LITERAL,
  74         EXPR_COMPOUND_LITERAL,
  75         EXPR_CALL,
  76         EXPR_CONDITIONAL,
  77         EXPR_SELECT,
  78         EXPR_ARRAY_ACCESS,
  79         EXPR_SIZEOF,
  80         EXPR_CLASSIFY_TYPE,
  81         EXPR_ALIGNOF,
  82
  83         EXPR_FUNCNAME,
  84         EXPR_BUILTIN_CONSTANT_P,
  85         EXPR_BUILTIN_TYPES_COMPATIBLE_P,
  86         EXPR_OFFSETOF,
  87         EXPR_VA_START,
  88         EXPR_VA_ARG,
  89         EXPR_VA_COPY,
  90         EXPR_STATEMENT,
  91         EXPR_LABEL_ADDRESS, /**< GCC extension &&label operator */
  92
  93         EXPR_UNARY_FIRST,
  94         EXPR_UNARY_NEGATE = EXPR_UNARY_FIRST,
  95         EXPR_UNARY_PLUS,
  96         EXPR_UNARY_BITWISE_NEGATE,
  97         EXPR_UNARY_NOT,
  98         EXPR_UNARY_DEREFERENCE,
  99         EXPR_UNARY_TAKE_ADDRESS,
 100         EXPR_UNARY_POSTFIX_INCREMENT,
 101         EXPR_UNARY_POSTFIX_DECREMENT,
 102         EXPR_UNARY_PREFIX_INCREMENT,
 103         EXPR_UNARY_PREFIX_DECREMENT,
 104         EXPR_UNARY_CAST,
 105         EXPR_UNARY_ASSUME,        /**< MS __assume() */
 106         EXPR_UNARY_DELETE,
 107         EXPR_UNARY_DELETE_ARRAY,
 108         EXPR_UNARY_THROW,
 109         EXPR_UNARY_LAST = EXPR_UNARY_THROW,
 110
 111         EXPR_BINARY_FIRST,
 112         EXPR_BINARY_ADD = EXPR_BINARY_FIRST,
 113         EXPR_BINARY_SUB,
 114         EXPR_BINARY_MUL,
 115         EXPR_BINARY_DIV,
 116         EXPR_BINARY_MOD,
 117         EXPR_BINARY_EQUAL,
 118         EXPR_BINARY_NOTEQUAL,
 119         EXPR_BINARY_LESS,
 120         EXPR_BINARY_LESSEQUAL,
 121         EXPR_BINARY_GREATER,
 122         EXPR_BINARY_GREATEREQUAL,
 123         EXPR_BINARY_BITWISE_AND,
 124         EXPR_BINARY_BITWISE_OR,
 125         EXPR_BINARY_BITWISE_XOR,
 126         EXPR_BINARY_LOGICAL_AND,
 127         EXPR_BINARY_LOGICAL_OR,
 128         EXPR_BINARY_SHIFTLEFT,
 129         EXPR_BINARY_SHIFTRIGHT,
 130         EXPR_BINARY_ASSIGN,
 131         EXPR_BINARY_MUL_ASSIGN,
 132         EXPR_BINARY_DIV_ASSIGN,
 133         EXPR_BINARY_MOD_ASSIGN,
 134         EXPR_BINARY_ADD_ASSIGN,
 135         EXPR_BINARY_SUB_ASSIGN,
 136         EXPR_BINARY_SHIFTLEFT_ASSIGN,
 137         EXPR_BINARY_SHIFTRIGHT_ASSIGN,
 138         EXPR_BINARY_BITWISE_AND_ASSIGN,
 139         EXPR_BINARY_BITWISE_XOR_ASSIGN,
 140         EXPR_BINARY_BITWISE_OR_ASSIGN,
 141         EXPR_BINARY_COMMA,
 142
 143         EXPR_BINARY_ISGREATER,
 144         EXPR_BINARY_ISGREATEREQUAL,
 145         EXPR_BINARY_ISLESS,
 146         EXPR_BINARY_ISLESSEQUAL,
 147         EXPR_BINARY_ISLESSGREATER,
 148         EXPR_BINARY_ISUNORDERED,
 149         EXPR_BINARY_LAST = EXPR_BINARY_ISUNORDERED,
 150 } expression_kind_t;
 151
 152 typedef enum funcname_kind_t {
 153         FUNCNAME_FUNCTION,           /**< C99 __func__, older __FUNCTION__ */
 154         FUNCNAME_PRETTY_FUNCTION,    /**< GNUC __PRETTY_FUNCTION__ */
 155         FUNCNAME_FUNCSIG,            /**< MS __FUNCSIG__ */
 156         FUNCNAME_FUNCDNAME           /**< MS __FUNCDNAME__ */
 157 } funcname_kind_t;
 158
 159 /* convenience macros */
 160 #define EXPR_BINARY_CASES              \
 161              EXPR_BINARY_ADD:                \
 162         case EXPR_BINARY_SUB:                \
 163         case EXPR_BINARY_MUL:                \
 164         case EXPR_BINARY_DIV:                \
 165         case EXPR_BINARY_MOD:                \
 166         case EXPR_BINARY_EQUAL:              \
 167         case EXPR_BINARY_NOTEQUAL:           \
 168         case EXPR_BINARY_LESS:               \
 169         case EXPR_BINARY_LESSEQUAL:          \
 170         case EXPR_BINARY_GREATER:            \
 171         case EXPR_BINARY_GREATEREQUAL:       \
 172         case EXPR_BINARY_BITWISE_AND:        \
 173         case EXPR_BINARY_BITWISE_OR:         \
 174         case EXPR_BINARY_BITWISE_XOR:        \
 175         case EXPR_BINARY_LOGICAL_AND:        \
 176         case EXPR_BINARY_LOGICAL_OR:         \
 177         case EXPR_BINARY_SHIFTLEFT:          \
 178         case EXPR_BINARY_SHIFTRIGHT:         \
 179         case EXPR_BINARY_ASSIGN:             \
 180         case EXPR_BINARY_MUL_ASSIGN:         \
 181         case EXPR_BINARY_DIV_ASSIGN:         \
 182         case EXPR_BINARY_MOD_ASSIGN:         \
 183         case EXPR_BINARY_ADD_ASSIGN:         \
 184         case EXPR_BINARY_SUB_ASSIGN:         \
 185         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   \
 186         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  \
 187         case EXPR_BINARY_BITWISE_AND_ASSIGN: \
 188         case EXPR_BINARY_BITWISE_XOR_ASSIGN: \
 189         case EXPR_BINARY_BITWISE_OR_ASSIGN:  \
 190         case EXPR_BINARY_COMMA:              \
 191         case EXPR_BINARY_ISGREATER:          \
 192         case EXPR_BINARY_ISGREATEREQUAL:     \
 193         case EXPR_BINARY_ISLESS:             \
 194         case EXPR_BINARY_ISLESSEQUAL:        \
 195         case EXPR_BINARY_ISLESSGREATER:      \
 196         case EXPR_BINARY_ISUNORDERED
 197
 198 /**
 199  * unary expression with mandatory operand
 200  */
 201 #define EXPR_UNARY_CASES_MANDATORY   \
 202              EXPR_UNARY_NEGATE:            \
 203         case EXPR_UNARY_PLUS:              \
 204         case EXPR_UNARY_BITWISE_NEGATE:    \
 205         case EXPR_UNARY_NOT:               \
 206         case EXPR_UNARY_DEREFERENCE:       \
 207         case EXPR_UNARY_TAKE_ADDRESS:      \
 208         case EXPR_UNARY_POSTFIX_INCREMENT: \
 209         case EXPR_UNARY_POSTFIX_DECREMENT: \
 210         case EXPR_UNARY_PREFIX_INCREMENT:  \
 211         case EXPR_UNARY_PREFIX_DECREMENT:  \
 212         case EXPR_UNARY_CAST:              \
 213         case EXPR_UNARY_ASSUME:            \
 214         case EXPR_UNARY_DELETE:            \
 215         case EXPR_UNARY_DELETE_ARRAY
 216
 217 /**
 218  * unary expression with optional operand
 219  */
 220 #define EXPR_UNARY_CASES_OPTIONAL \
 221         EXPR_UNARY_THROW
 222
 223 #define EXPR_UNARY_CASES           \
 224              EXPR_UNARY_CASES_MANDATORY: \
 225         case EXPR_UNARY_CASES_OPTIONAL
 226
 227 #define EXPR_LITERAL_CASES                     \
 228              EXPR_LITERAL_BOOLEAN:                   \
 229         case EXPR_LITERAL_INTEGER:                   \
 230         case EXPR_LITERAL_FLOATINGPOINT:             \
 231         case EXPR_LITERAL_MS_NOOP
 232
 233 /**
 234  * The base class of every expression.
 235  */
 236 struct expression_base_t {
 237         expression_kind_t   kind;            /**< The expression kind. */
 238         type_t             *type;            /**< The type of the expression. */
 239         source_position_t   source_position; /**< The source position of this expression. */
 240         bool                parenthesized : 1;
 241 #ifndef NDEBUG
 242         bool                transformed : 1;     /**< Set if this expression was transformed. */
 243 #endif
 244         bool                implicit : 1;    /**< compiler generated expression.
 245                                                   Examples:
 246                                                      select into anonymous structs
 247                                                      implicit casts
 248                                               */
 249 };
 250
 251 /**
 252  * integer, float and boolean constants
 253  */
 254 struct literal_expression_t {
 255         expression_base_t base;
 256         string_t          value;
 257         char const       *suffix; /**< Start of the suffix in value. */
 258
 259         /* ast2firm data */
 260         ir_tarval        *target_value;
 261 };
 262
 263 /**
 264  * string and character literals
 265  */
 266 struct string_literal_expression_t {
 267         expression_base_t base;
 268         string_t          value;
 269 };
 270
 271 struct funcname_expression_t {
 272         expression_base_t  base;
 273         funcname_kind_t    kind;
 274 };
 275
 276 struct compound_literal_expression_t {
 277         expression_base_t  base;
 278         type_t            *type;
 279         initializer_t     *initializer;
 280 };
 281
 282 struct builtin_constant_expression_t {
 283         expression_base_t  base;
 284         expression_t      *value;
 285 };
 286
 287 struct builtin_types_compatible_expression_t {
 288         expression_base_t  base;
 289         type_t            *left;
 290         type_t            *right;
 291 };
 292
 293 struct reference_expression_t {
 294         expression_base_t  base;
 295         entity_t          *entity;
 296 };
 297
 298 /**
 299  * An argument of a call.
 300  */
 301 struct call_argument_t {
 302         expression_t    *expression;  /**< The expression which value is transmitted. */
 303         call_argument_t *next;        /**< Links to the next argument of this call. */
 304 };
 305
 306
 307 struct call_expression_t {
 308         expression_base_t  base;
 309         expression_t      *function;  /**< The address of the function to call. */
 310         call_argument_t   *arguments; /**< List of arguments of this call. */
 311 };
 312
 313
 314 struct unary_expression_t {
 315         expression_base_t  base;
 316         expression_t      *value;     /**< The unary operand. */
 317 };
 318
 319 struct binary_expression_t {
 320         expression_base_t  base;
 321         expression_t      *left;
 322         expression_t      *right;
 323 };
 324
 325 struct select_expression_t {
 326         expression_base_t  base;
 327         expression_t      *compound;
 328         entity_t          *compound_entry;
 329 };
 330
 331 struct array_access_expression_t {
 332         expression_base_t  base;
 333         expression_t      *array_ref; /**< the referenced array */
 334         expression_t      *index;     /**< the index used */
 335         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 336 };
 337
 338 struct typeprop_expression_t {
 339         expression_base_t  base;
 340         type_t            *type;
 341         expression_t      *tp_expression;
 342 };
 343
 344 struct designator_t {
 345         source_position_t  source_position;
 346         symbol_t          *symbol;      /**< the symbol if any */
 347         expression_t      *array_index; /**< the array index if any */
 348         designator_t      *next;
 349 };
 350
 351 struct offsetof_expression_t {
 352         expression_base_t  base;
 353         type_t            *type;
 354         designator_t      *designator;
 355 };
 356
 357 struct va_start_expression_t {
 358         expression_base_t  base;
 359         expression_t      *ap;
 360         expression_t      *parameter;
 361 };
 362
 363 struct va_arg_expression_t {
 364         expression_base_t  base;
 365         expression_t      *ap;
 366 };
 367
 368 struct va_copy_expression_t {
 369         expression_base_t  base;
 370         expression_t      *dst;    /**< destination argument */
 371         expression_t      *src;    /**< source argument */
 372 };
 373
 374 struct conditional_expression_t {
 375         expression_base_t  base;
 376         expression_t      *condition;
 377         expression_t      *true_expression;
 378         expression_t      *false_expression;
 379 };
 380
 381 struct statement_expression_t {
 382         expression_base_t  base;
 383         statement_t       *statement;
 384 };
 385
 386 struct classify_type_expression_t {
 387         expression_base_t  base;
 388         expression_t      *type_expression;
 389 };
 390
 391 struct label_address_expression_t {
 392         expression_base_t  base;
 393         label_t           *label;
 394 };
 395
 396 union expression_t {
 397         expression_kind_t                     kind;
 398         expression_base_t                     base;
 399         literal_expression_t                  literal;
 400         string_literal_expression_t           string_literal;
 401         funcname_expression_t                 funcname;
 402         compound_literal_expression_t         compound_literal;
 403         builtin_constant_expression_t         builtin_constant;
 404         builtin_types_compatible_expression_t builtin_types_compatible;
 405         reference_expression_t                reference;
 406         call_expression_t                     call;
 407         unary_expression_t                    unary;
 408         binary_expression_t                   binary;
 409         select_expression_t                   select;
 410         array_access_expression_t             array_access;
 411         typeprop_expression_t                 typeprop;
 412         offsetof_expression_t                 offsetofe;
 413         va_start_expression_t                 va_starte;
 414         va_arg_expression_t                   va_arge;
 415         va_copy_expression_t                  va_copye;
 416         conditional_expression_t              conditional;
 417         statement_expression_t                statement;
 418         classify_type_expression_t            classify_type;
 419         label_address_expression_t            label_address;
 420 };
 421
 422 typedef enum initializer_kind_t {
 423         INITIALIZER_VALUE,
 424         INITIALIZER_LIST,
 425         INITIALIZER_STRING,
 426         INITIALIZER_DESIGNATOR
 427 } initializer_kind_t;
 428
 429 struct initializer_base_t {
 430         initializer_kind_t kind;
 431 };
 432
 433 struct initializer_value_t {
 434         initializer_base_t  base;
 435         expression_t       *value;
 436 };
 437
 438 struct initializer_list_t {
 439         initializer_base_t  base;
 440         size_t              len;
 441         initializer_t      *initializers[];
 442 };
 443
 444 struct initializer_designator_t {
 445         initializer_base_t  base;
 446         designator_t       *designator;
 447 };
 448
 449 union initializer_t {
 450         initializer_kind_t        kind;
 451         initializer_base_t        base;
 452         initializer_value_t       value;
 453         initializer_list_t        list;
 454         initializer_designator_t  designator;
 455 };
 456
 457 static inline string_literal_expression_t const *get_init_string(initializer_t const *const init)
 458 {
 459         assert(init->kind == INITIALIZER_STRING);
 460         assert(init->value.value->kind == EXPR_STRING_LITERAL);
 461         return &init->value.value->string_literal;
 462 }
 463
 464 /**
 465  * The statement kinds.
 466  */
 467 typedef enum statement_kind_t {
 468         STATEMENT_ERROR = 1,
 469         STATEMENT_EMPTY,
 470         STATEMENT_COMPOUND,
 471         STATEMENT_RETURN,
 472         STATEMENT_DECLARATION,
 473         STATEMENT_IF,
 474         STATEMENT_SWITCH,
 475         STATEMENT_EXPRESSION,
 476         STATEMENT_CONTINUE,
 477         STATEMENT_BREAK,
 478         STATEMENT_COMPUTED_GOTO,
 479         STATEMENT_GOTO,
 480         STATEMENT_LABEL,
 481         STATEMENT_CASE_LABEL,
 482         STATEMENT_DO_WHILE,
 483         STATEMENT_FOR,
 484         STATEMENT_ASM,
 485         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 486         STATEMENT_LEAVE            /**< MS __leave */
 487 } statement_kind_t;
 488
 489 /**
 490  * The base class of every statement.
 491  */
 492 struct statement_base_t {
 493         statement_kind_t   kind;
 494         statement_t       *next;         /**< Point to the next statement in a compound statement. */
 495         source_position_t  source_position;
 496         statement_t       *parent;       /**< The Parent statement that controls the execution. */
 497         bool               reachable;    /**< True, if this statement is reachable. */
 498 #ifndef NDEBUG
 499         bool               transformed;
 500 #endif
 501 };
 502
 503 struct return_statement_t {
 504         statement_base_t  base;
 505         expression_t     *value;    /**< The return value if any. */
 506 };
 507
 508 struct compound_statement_t {
 509         statement_base_t  base;
 510         statement_t      *statements;
 511         scope_t           scope;
 512         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 513 };
 514
 515 struct declaration_statement_t {
 516         statement_base_t  base;
 517         entity_t         *declarations_begin;
 518         entity_t         *declarations_end;
 519 };
 520
 521 struct if_statement_t {
 522         statement_base_t  base;
 523         scope_t           scope;
 524         expression_t     *condition;
 525         statement_t      *true_statement;
 526         statement_t      *false_statement;
 527 };
 528
 529 struct switch_statement_t {
 530         statement_base_t        base;
 531         scope_t                 scope;
 532         expression_t           *expression;
 533         statement_t            *body;
 534         case_label_statement_t *first_case, *last_case; /**< List of all cases, including default. */
 535         case_label_statement_t *default_label;          /**< The default label if existent. */
 536 };
 537
 538 struct goto_statement_t {
 539         statement_base_t  base;
 540         label_t          *label;         /**< The destination label. */
 541         goto_statement_t *next;          /**< links all goto statements of a function */
 542 };
 543
 544 struct computed_goto_statement_t {
 545         statement_base_t  base;
 546         expression_t     *expression; /**< The expression for the computed goto. */
 547 };
 548
 549 struct case_label_statement_t {
 550         statement_base_t        base;
 551         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 552         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 553         case_label_statement_t *next;          /**< link to the next case label in switch */
 554         statement_t            *statement;
 555         ir_tarval              *first_case;
 556         ir_tarval              *last_case;
 557         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 558         bool                   is_empty_range; /**< If set marked this as an empty range. */
 559         long                   pn;
 560 };
 561
 562 struct label_statement_t {
 563         statement_base_t   base;
 564         label_t           *label;
 565         statement_t       *statement;
 566         label_statement_t *next;    /**< links all label statements of a function */
 567 };
 568
 569 struct expression_statement_t {
 570         statement_base_t  base;
 571         expression_t     *expression;
 572 };
 573
 574 struct do_while_statement_t {
 575         statement_base_t  base;
 576         scope_t           scope;
 577         expression_t     *condition;
 578         statement_t      *body;
 579 };
 580
 581 struct for_statement_t {
 582         statement_base_t  base;
 583         scope_t           scope;
 584         expression_t     *initialisation;
 585         expression_t     *condition;
 586         expression_t     *step;
 587         statement_t      *body;
 588         bool              condition_reachable:1;
 589         bool              step_reachable:1;
 590 };
 591
 592 struct asm_argument_t {
 593         string_t        constraints;
 594         expression_t   *expression;
 595         symbol_t       *symbol;
 596         asm_argument_t *next;
 597 };
 598
 599 struct asm_clobber_t {
 600         string_t       clobber;
 601         asm_clobber_t *next;
 602 };
 603
 604 struct asm_label_t {
 605         label_t     *label;
 606         asm_label_t *next;
 607 };
 608
 609 struct asm_statement_t {
 610         statement_base_t base;
 611         string_t         asm_text;
 612         asm_argument_t  *inputs;
 613         asm_argument_t  *outputs;
 614         asm_clobber_t   *clobbers;
 615         asm_label_t     *labels;
 616         bool             is_volatile;
 617 };
 618
 619 struct ms_try_statement_t {
 620         statement_base_t  base;
 621         statement_t      *try_statement;
 622         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 623         statement_t      *final_statement;
 624 };
 625
 626 struct leave_statement_t {
 627         statement_base_t  base;
 628 };
 629
 630 union statement_t {
 631         statement_kind_t          kind;
 632         statement_base_t          base;
 633         return_statement_t        returns;
 634         compound_statement_t      compound;
 635         declaration_statement_t   declaration;
 636         if_statement_t            ifs;
 637         switch_statement_t        switchs;
 638         computed_goto_statement_t computed_goto;
 639         goto_statement_t          gotos;
 640         case_label_statement_t    case_label;
 641         label_statement_t         label;
 642         expression_statement_t    expression;
 643         do_while_statement_t      do_while;
 644         for_statement_t           fors;
 645         asm_statement_t           asms;
 646         ms_try_statement_t        ms_try;
 647         leave_statement_t         leave;
 648 };
 649
 650 struct translation_unit_t {
 651         scope_t      scope;
 652         statement_t *global_asm;
 653 };
 654
 655 /**
 656  * Allocate an AST node with given size and
 657  * initialize all fields with zero.
 658  */
 659 static inline void *allocate_ast_zero(size_t size)
 660 {
 661         return memset(obstack_alloc(&ast_obstack, size), 0, size);
 662 }
 663
 664 /** If set, implicit casts are printed. */
 665 extern bool print_implicit_casts;
 666 /** If set parenthesis are printed to indicate operator precedence. */
 667 extern bool print_parenthesis;
 668
 669 #endif