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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_INTEGER_OCTAL,
  71         EXPR_LITERAL_INTEGER_HEXADECIMAL,
  72         EXPR_LITERAL_FLOATINGPOINT,
  73         EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL,
  74         EXPR_LITERAL_CHARACTER,
  75         EXPR_LITERAL_WIDE_CHARACTER,
  76         EXPR_LITERAL_MS_NOOP, /**< MS __noop extension */
  77         EXPR_STRING_LITERAL,
  78         EXPR_WIDE_STRING_LITERAL,
  79         EXPR_COMPOUND_LITERAL,
  80         EXPR_CALL,
  81         EXPR_CONDITIONAL,
  82         EXPR_SELECT,
  83         EXPR_ARRAY_ACCESS,
  84         EXPR_SIZEOF,
  85         EXPR_CLASSIFY_TYPE,
  86         EXPR_ALIGNOF,
  87
  88         EXPR_FUNCNAME,
  89         EXPR_BUILTIN_CONSTANT_P,
  90         EXPR_BUILTIN_TYPES_COMPATIBLE_P,
  91         EXPR_OFFSETOF,
  92         EXPR_VA_START,
  93         EXPR_VA_ARG,
  94         EXPR_VA_COPY,
  95         EXPR_STATEMENT,
  96         EXPR_LABEL_ADDRESS, /**< GCC extension &&label operator */
  97
  98         EXPR_UNARY_FIRST,
  99         EXPR_UNARY_NEGATE = EXPR_UNARY_FIRST,
 100         EXPR_UNARY_PLUS,
 101         EXPR_UNARY_BITWISE_NEGATE,
 102         EXPR_UNARY_NOT,
 103         EXPR_UNARY_DEREFERENCE,
 104         EXPR_UNARY_TAKE_ADDRESS,
 105         EXPR_UNARY_POSTFIX_INCREMENT,
 106         EXPR_UNARY_POSTFIX_DECREMENT,
 107         EXPR_UNARY_PREFIX_INCREMENT,
 108         EXPR_UNARY_PREFIX_DECREMENT,
 109         EXPR_UNARY_CAST,
 110         EXPR_UNARY_ASSUME,        /**< MS __assume() */
 111         EXPR_UNARY_DELETE,
 112         EXPR_UNARY_DELETE_ARRAY,
 113         EXPR_UNARY_THROW,
 114         EXPR_UNARY_LAST = EXPR_UNARY_THROW,
 115
 116         EXPR_BINARY_FIRST,
 117         EXPR_BINARY_ADD = EXPR_BINARY_FIRST,
 118         EXPR_BINARY_SUB,
 119         EXPR_BINARY_MUL,
 120         EXPR_BINARY_DIV,
 121         EXPR_BINARY_MOD,
 122         EXPR_BINARY_EQUAL,
 123         EXPR_BINARY_NOTEQUAL,
 124         EXPR_BINARY_LESS,
 125         EXPR_BINARY_LESSEQUAL,
 126         EXPR_BINARY_GREATER,
 127         EXPR_BINARY_GREATEREQUAL,
 128         EXPR_BINARY_BITWISE_AND,
 129         EXPR_BINARY_BITWISE_OR,
 130         EXPR_BINARY_BITWISE_XOR,
 131         EXPR_BINARY_LOGICAL_AND,
 132         EXPR_BINARY_LOGICAL_OR,
 133         EXPR_BINARY_SHIFTLEFT,
 134         EXPR_BINARY_SHIFTRIGHT,
 135         EXPR_BINARY_ASSIGN,
 136         EXPR_BINARY_MUL_ASSIGN,
 137         EXPR_BINARY_DIV_ASSIGN,
 138         EXPR_BINARY_MOD_ASSIGN,
 139         EXPR_BINARY_ADD_ASSIGN,
 140         EXPR_BINARY_SUB_ASSIGN,
 141         EXPR_BINARY_SHIFTLEFT_ASSIGN,
 142         EXPR_BINARY_SHIFTRIGHT_ASSIGN,
 143         EXPR_BINARY_BITWISE_AND_ASSIGN,
 144         EXPR_BINARY_BITWISE_XOR_ASSIGN,
 145         EXPR_BINARY_BITWISE_OR_ASSIGN,
 146         EXPR_BINARY_COMMA,
 147
 148         EXPR_BINARY_ISGREATER,
 149         EXPR_BINARY_ISGREATEREQUAL,
 150         EXPR_BINARY_ISLESS,
 151         EXPR_BINARY_ISLESSEQUAL,
 152         EXPR_BINARY_ISLESSGREATER,
 153         EXPR_BINARY_ISUNORDERED,
 154         EXPR_BINARY_LAST = EXPR_BINARY_ISUNORDERED,
 155 } expression_kind_t;
 156
 157 typedef enum funcname_kind_t {
 158         FUNCNAME_FUNCTION,           /**< C99 __func__, older __FUNCTION__ */
 159         FUNCNAME_PRETTY_FUNCTION,    /**< GNUC __PRETTY_FUNCTION__ */
 160         FUNCNAME_FUNCSIG,            /**< MS __FUNCSIG__ */
 161         FUNCNAME_FUNCDNAME           /**< MS __FUNCDNAME__ */
 162 } funcname_kind_t;
 163
 164 /* convenience macros */
 165 #define EXPR_BINARY_CASES              \
 166              EXPR_BINARY_ADD:                \
 167         case EXPR_BINARY_SUB:                \
 168         case EXPR_BINARY_MUL:                \
 169         case EXPR_BINARY_DIV:                \
 170         case EXPR_BINARY_MOD:                \
 171         case EXPR_BINARY_EQUAL:              \
 172         case EXPR_BINARY_NOTEQUAL:           \
 173         case EXPR_BINARY_LESS:               \
 174         case EXPR_BINARY_LESSEQUAL:          \
 175         case EXPR_BINARY_GREATER:            \
 176         case EXPR_BINARY_GREATEREQUAL:       \
 177         case EXPR_BINARY_BITWISE_AND:        \
 178         case EXPR_BINARY_BITWISE_OR:         \
 179         case EXPR_BINARY_BITWISE_XOR:        \
 180         case EXPR_BINARY_LOGICAL_AND:        \
 181         case EXPR_BINARY_LOGICAL_OR:         \
 182         case EXPR_BINARY_SHIFTLEFT:          \
 183         case EXPR_BINARY_SHIFTRIGHT:         \
 184         case EXPR_BINARY_ASSIGN:             \
 185         case EXPR_BINARY_MUL_ASSIGN:         \
 186         case EXPR_BINARY_DIV_ASSIGN:         \
 187         case EXPR_BINARY_MOD_ASSIGN:         \
 188         case EXPR_BINARY_ADD_ASSIGN:         \
 189         case EXPR_BINARY_SUB_ASSIGN:         \
 190         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   \
 191         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  \
 192         case EXPR_BINARY_BITWISE_AND_ASSIGN: \
 193         case EXPR_BINARY_BITWISE_XOR_ASSIGN: \
 194         case EXPR_BINARY_BITWISE_OR_ASSIGN:  \
 195         case EXPR_BINARY_COMMA:              \
 196         case EXPR_BINARY_ISGREATER:          \
 197         case EXPR_BINARY_ISGREATEREQUAL:     \
 198         case EXPR_BINARY_ISLESS:             \
 199         case EXPR_BINARY_ISLESSEQUAL:        \
 200         case EXPR_BINARY_ISLESSGREATER:      \
 201         case EXPR_BINARY_ISUNORDERED
 202
 203 /**
 204  * unary expression with mandatory operand
 205  */
 206 #define EXPR_UNARY_CASES_MANDATORY   \
 207              EXPR_UNARY_NEGATE:            \
 208         case EXPR_UNARY_PLUS:              \
 209         case EXPR_UNARY_BITWISE_NEGATE:    \
 210         case EXPR_UNARY_NOT:               \
 211         case EXPR_UNARY_DEREFERENCE:       \
 212         case EXPR_UNARY_TAKE_ADDRESS:      \
 213         case EXPR_UNARY_POSTFIX_INCREMENT: \
 214         case EXPR_UNARY_POSTFIX_DECREMENT: \
 215         case EXPR_UNARY_PREFIX_INCREMENT:  \
 216         case EXPR_UNARY_PREFIX_DECREMENT:  \
 217         case EXPR_UNARY_CAST:              \
 218         case EXPR_UNARY_ASSUME:            \
 219         case EXPR_UNARY_DELETE:            \
 220         case EXPR_UNARY_DELETE_ARRAY
 221
 222 /**
 223  * unary expression with optional operand
 224  */
 225 #define EXPR_UNARY_CASES_OPTIONAL \
 226         EXPR_UNARY_THROW
 227
 228 #define EXPR_UNARY_CASES           \
 229              EXPR_UNARY_CASES_MANDATORY: \
 230         case EXPR_UNARY_CASES_OPTIONAL
 231
 232 #define EXPR_LITERAL_CASES                     \
 233              EXPR_LITERAL_BOOLEAN:                   \
 234         case EXPR_LITERAL_INTEGER:                   \
 235         case EXPR_LITERAL_INTEGER_OCTAL:             \
 236         case EXPR_LITERAL_INTEGER_HEXADECIMAL:       \
 237         case EXPR_LITERAL_FLOATINGPOINT:             \
 238         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: \
 239         case EXPR_LITERAL_CHARACTER:                 \
 240         case EXPR_LITERAL_WIDE_CHARACTER:            \
 241         case EXPR_LITERAL_MS_NOOP
 242
 243 /**
 244  * The base class of every expression.
 245  */
 246 struct expression_base_t {
 247         expression_kind_t   kind;            /**< The expression kind. */
 248         type_t             *type;            /**< The type of the expression. */
 249         source_position_t   source_position; /**< The source position of this expression. */
 250         bool                parenthesized : 1;
 251 #ifndef NDEBUG
 252         bool                transformed : 1;     /**< Set if this expression was transformed. */
 253 #endif
 254         bool                implicit : 1;    /**< compiler generated expression.
 255                                                   Examples:
 256                                                      select into anonymous structs
 257                                                      implicit casts
 258                                               */
 259 };
 260
 261 /**
 262  * integer/float constants, character and string literals
 263  */
 264 struct literal_expression_t {
 265         expression_base_t  base;
 266         string_t           value;
 267         string_t           suffix;
 268
 269         /* ast2firm data */
 270         ir_tarval         *target_value;
 271 };
 272
 273 struct string_literal_expression_t {
 274         expression_base_t  base;
 275         string_t           value;
 276 };
 277
 278 struct funcname_expression_t {
 279         expression_base_t  base;
 280         funcname_kind_t    kind;
 281         string_t           value;     /**< the value once assigned. */
 282 };
 283
 284 struct compound_literal_expression_t {
 285         expression_base_t  base;
 286         type_t            *type;
 287         initializer_t     *initializer;
 288 };
 289
 290 struct builtin_constant_expression_t {
 291         expression_base_t  base;
 292         expression_t      *value;
 293 };
 294
 295 struct builtin_types_compatible_expression_t {
 296         expression_base_t  base;
 297         type_t            *left;
 298         type_t            *right;
 299 };
 300
 301 struct reference_expression_t {
 302         expression_base_t  base;
 303         entity_t          *entity;
 304 };
 305
 306 /**
 307  * An argument of a call.
 308  */
 309 struct call_argument_t {
 310         expression_t    *expression;  /**< The expression which value is transmitted. */
 311         call_argument_t *next;        /**< Links to the next argument of this call. */
 312 };
 313
 314
 315 struct call_expression_t {
 316         expression_base_t  base;
 317         expression_t      *function;  /**< The address of the function to call. */
 318         call_argument_t   *arguments; /**< List of arguments of this call. */
 319 };
 320
 321
 322 struct unary_expression_t {
 323         expression_base_t  base;
 324         expression_t      *value;     /**< The unary operand. */
 325 };
 326
 327 struct binary_expression_t {
 328         expression_base_t  base;
 329         expression_t      *left;
 330         expression_t      *right;
 331 };
 332
 333 struct select_expression_t {
 334         expression_base_t  base;
 335         expression_t      *compound;
 336         entity_t          *compound_entry;
 337 };
 338
 339 struct array_access_expression_t {
 340         expression_base_t  base;
 341         expression_t      *array_ref; /**< the referenced array */
 342         expression_t      *index;     /**< the index used */
 343         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 344 };
 345
 346 struct typeprop_expression_t {
 347         expression_base_t  base;
 348         type_t            *type;
 349         expression_t      *tp_expression;
 350 };
 351
 352 struct designator_t {
 353         source_position_t  source_position;
 354         symbol_t          *symbol;      /**< the symbol if any */
 355         expression_t      *array_index; /**< the array index if any */
 356         designator_t      *next;
 357 };
 358
 359 struct offsetof_expression_t {
 360         expression_base_t  base;
 361         type_t            *type;
 362         designator_t      *designator;
 363 };
 364
 365 struct va_start_expression_t {
 366         expression_base_t  base;
 367         expression_t      *ap;
 368         variable_t        *parameter;
 369 };
 370
 371 struct va_arg_expression_t {
 372         expression_base_t  base;
 373         expression_t      *ap;
 374 };
 375
 376 struct va_copy_expression_t {
 377         expression_base_t  base;
 378         expression_t      *dst;    /**< destination argument */
 379         expression_t      *src;    /**< source argument */
 380 };
 381
 382 struct conditional_expression_t {
 383         expression_base_t  base;
 384         expression_t      *condition;
 385         expression_t      *true_expression;
 386         expression_t      *false_expression;
 387 };
 388
 389 struct statement_expression_t {
 390         expression_base_t  base;
 391         statement_t       *statement;
 392 };
 393
 394 struct classify_type_expression_t {
 395         expression_base_t  base;
 396         expression_t      *type_expression;
 397 };
 398
 399 struct label_address_expression_t {
 400         expression_base_t  base;
 401         label_t           *label;
 402 };
 403
 404 union expression_t {
 405         expression_kind_t                     kind;
 406         expression_base_t                     base;
 407         literal_expression_t                  literal;
 408         string_literal_expression_t           string_literal;
 409         funcname_expression_t                 funcname;
 410         compound_literal_expression_t         compound_literal;
 411         builtin_constant_expression_t         builtin_constant;
 412         builtin_types_compatible_expression_t builtin_types_compatible;
 413         reference_expression_t                reference;
 414         call_expression_t                     call;
 415         unary_expression_t                    unary;
 416         binary_expression_t                   binary;
 417         select_expression_t                   select;
 418         array_access_expression_t             array_access;
 419         typeprop_expression_t                 typeprop;
 420         offsetof_expression_t                 offsetofe;
 421         va_start_expression_t                 va_starte;
 422         va_arg_expression_t                   va_arge;
 423         va_copy_expression_t                  va_copye;
 424         conditional_expression_t              conditional;
 425         statement_expression_t                statement;
 426         classify_type_expression_t            classify_type;
 427         label_address_expression_t            label_address;
 428 };
 429
 430 typedef enum initializer_kind_t {
 431         INITIALIZER_VALUE,
 432         INITIALIZER_LIST,
 433         INITIALIZER_STRING,
 434         INITIALIZER_WIDE_STRING,
 435         INITIALIZER_DESIGNATOR
 436 } initializer_kind_t;
 437
 438 struct initializer_base_t {
 439         initializer_kind_t kind;
 440 };
 441
 442 struct initializer_value_t {
 443         initializer_base_t  base;
 444         expression_t       *value;
 445 };
 446
 447 struct initializer_list_t {
 448         initializer_base_t  base;
 449         size_t              len;
 450         initializer_t      *initializers[];
 451 };
 452
 453 struct initializer_string_t {
 454         initializer_base_t base;
 455         string_t           string;
 456 };
 457
 458 struct initializer_wide_string_t {
 459         initializer_base_t  base;
 460         string_t            string;
 461 };
 462
 463 struct initializer_designator_t {
 464         initializer_base_t  base;
 465         designator_t       *designator;
 466 };
 467
 468 union initializer_t {
 469         initializer_kind_t        kind;
 470         initializer_base_t        base;
 471         initializer_value_t       value;
 472         initializer_list_t        list;
 473         initializer_string_t      string;
 474         initializer_wide_string_t wide_string;
 475         initializer_designator_t  designator;
 476 };
 477
 478 /**
 479  * The statement kinds.
 480  */
 481 typedef enum statement_kind_t {
 482         STATEMENT_ERROR = 1,
 483         STATEMENT_EMPTY,
 484         STATEMENT_COMPOUND,
 485         STATEMENT_RETURN,
 486         STATEMENT_DECLARATION,
 487         STATEMENT_IF,
 488         STATEMENT_SWITCH,
 489         STATEMENT_EXPRESSION,
 490         STATEMENT_CONTINUE,
 491         STATEMENT_BREAK,
 492         STATEMENT_COMPUTED_GOTO,
 493         STATEMENT_GOTO,
 494         STATEMENT_LABEL,
 495         STATEMENT_CASE_LABEL,
 496         STATEMENT_WHILE,
 497         STATEMENT_DO_WHILE,
 498         STATEMENT_FOR,
 499         STATEMENT_ASM,
 500         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 501         STATEMENT_LEAVE            /**< MS __leave */
 502 } statement_kind_t;
 503
 504 /**
 505  * The base class of every statement.
 506  */
 507 struct statement_base_t {
 508         statement_kind_t   kind;
 509         statement_t       *next;         /**< Point to the next statement in a compound statement. */
 510         source_position_t  source_position;
 511         statement_t       *parent;       /**< The Parent statement that controls the execution. */
 512         bool               reachable;    /**< True, if this statement is reachable. */
 513 #ifndef NDEBUG
 514         bool               transformed;
 515 #endif
 516 };
 517
 518 struct return_statement_t {
 519         statement_base_t  base;
 520         expression_t     *value;    /**< The return value if any. */
 521 };
 522
 523 struct compound_statement_t {
 524         statement_base_t  base;
 525         statement_t      *statements;
 526         scope_t           scope;
 527         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 528 };
 529
 530 struct declaration_statement_t {
 531         statement_base_t  base;
 532         entity_t         *declarations_begin;
 533         entity_t         *declarations_end;
 534 };
 535
 536 struct if_statement_t {
 537         statement_base_t  base;
 538         scope_t           scope;
 539         expression_t     *condition;
 540         statement_t      *true_statement;
 541         statement_t      *false_statement;
 542 };
 543
 544 struct switch_statement_t {
 545         statement_base_t        base;
 546         scope_t                 scope;
 547         expression_t           *expression;
 548         statement_t            *body;
 549         case_label_statement_t *first_case, *last_case; /**< List of all cases, including default. */
 550         case_label_statement_t *default_label;          /**< The default label if existent. */
 551 };
 552
 553 struct goto_statement_t {
 554         statement_base_t  base;
 555         label_t          *label;         /**< The destination label. */
 556         goto_statement_t *next;          /**< links all goto statements of a function */
 557 };
 558
 559 struct computed_goto_statement_t {
 560         statement_base_t  base;
 561         expression_t     *expression; /**< The expression for the computed goto. */
 562 };
 563
 564 struct case_label_statement_t {
 565         statement_base_t        base;
 566         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 567         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 568         case_label_statement_t *next;          /**< link to the next case label in switch */
 569         statement_t            *statement;
 570         long                   first_case;     /**< The folded value of expression. */
 571         long                   last_case;      /**< The folded value of end_range. */
 572         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 573         bool                   is_empty_range; /**< If set marked this as an empty range. */
 574         long                   pn;
 575 };
 576
 577 struct label_statement_t {
 578         statement_base_t   base;
 579         label_t           *label;
 580         statement_t       *statement;
 581         label_statement_t *next;    /**< links all label statements of a function */
 582 };
 583
 584 struct expression_statement_t {
 585         statement_base_t  base;
 586         expression_t     *expression;
 587 };
 588
 589 struct while_statement_t {
 590         statement_base_t  base;
 591         scope_t           scope;
 592         expression_t     *condition;
 593         statement_t      *body;
 594 };
 595
 596 struct do_while_statement_t {
 597         statement_base_t  base;
 598         scope_t           scope;
 599         expression_t     *condition;
 600         statement_t      *body;
 601 };
 602
 603 struct for_statement_t {
 604         statement_base_t  base;
 605         scope_t           scope;
 606         expression_t     *initialisation;
 607         expression_t     *condition;
 608         expression_t     *step;
 609         statement_t      *body;
 610         bool              condition_reachable:1;
 611         bool              step_reachable:1;
 612 };
 613
 614 struct asm_argument_t {
 615         string_t        constraints;
 616         expression_t   *expression;
 617         symbol_t       *symbol;
 618         asm_argument_t *next;
 619 };
 620
 621 struct asm_clobber_t {
 622         string_t       clobber;
 623         asm_clobber_t *next;
 624 };
 625
 626 struct asm_statement_t {
 627         statement_base_t base;
 628         string_t         asm_text;
 629         asm_argument_t  *inputs;
 630         asm_argument_t  *outputs;
 631         asm_clobber_t   *clobbers;
 632         bool             is_volatile;
 633 };
 634
 635 struct ms_try_statement_t {
 636         statement_base_t  base;
 637         statement_t      *try_statement;
 638         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 639         statement_t      *final_statement;
 640 };
 641
 642 struct leave_statement_t {
 643         statement_base_t  base;
 644 };
 645
 646 union statement_t {
 647         statement_kind_t          kind;
 648         statement_base_t          base;
 649         return_statement_t        returns;
 650         compound_statement_t      compound;
 651         declaration_statement_t   declaration;
 652         if_statement_t            ifs;
 653         switch_statement_t        switchs;
 654         computed_goto_statement_t computed_goto;
 655         goto_statement_t          gotos;
 656         case_label_statement_t    case_label;
 657         label_statement_t         label;
 658         expression_statement_t    expression;
 659         while_statement_t         whiles;
 660         do_while_statement_t      do_while;
 661         for_statement_t           fors;
 662         asm_statement_t           asms;
 663         ms_try_statement_t        ms_try;
 664         leave_statement_t         leave;
 665 };
 666
 667 struct translation_unit_t {
 668         scope_t      scope;
 669         statement_t *global_asm;
 670 };
 671
 672 /**
 673  * Allocate an AST node with given size and
 674  * initialize all fields with zero.
 675  */
 676 static inline void *allocate_ast_zero(size_t size)
 677 {
 678         return memset(obstack_alloc(&ast_obstack, size), 0, size);
 679 }
 680
 681 /** If set, implicit casts are printed. */
 682 extern bool print_implicit_casts;
 683 /** If set parenthesis are printed to indicate operator precedence. */
 684 extern bool print_parenthesis;
 685
 686 #endif