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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_UNKNOWN = 0,
  66         EXPR_INVALID,
  67         EXPR_REFERENCE,
  68         EXPR_REFERENCE_ENUM_VALUE,
  69         EXPR_LITERAL_BOOLEAN,
  70         EXPR_LITERAL_INTEGER,
  71         EXPR_LITERAL_INTEGER_OCTAL,
  72         EXPR_LITERAL_INTEGER_HEXADECIMAL,
  73         EXPR_LITERAL_FLOATINGPOINT,
  74         EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL,
  75         EXPR_LITERAL_CHARACTER,
  76         EXPR_LITERAL_WIDE_CHARACTER,
  77         EXPR_LITERAL_MS_NOOP, /**< MS __noop extension */
  78         EXPR_STRING_LITERAL,
  79         EXPR_WIDE_STRING_LITERAL,
  80         EXPR_COMPOUND_LITERAL,
  81         EXPR_CALL,
  82         EXPR_CONDITIONAL,
  83         EXPR_SELECT,
  84         EXPR_ARRAY_ACCESS,
  85         EXPR_SIZEOF,
  86         EXPR_CLASSIFY_TYPE,
  87         EXPR_ALIGNOF,
  88
  89         EXPR_FUNCNAME,
  90         EXPR_BUILTIN_CONSTANT_P,
  91         EXPR_BUILTIN_TYPES_COMPATIBLE_P,
  92         EXPR_OFFSETOF,
  93         EXPR_VA_START,
  94         EXPR_VA_ARG,
  95         EXPR_VA_COPY,
  96         EXPR_STATEMENT,
  97         EXPR_LABEL_ADDRESS, /**< GCC extension &&label operator */
  98
  99         EXPR_UNARY_FIRST,
 100         EXPR_UNARY_NEGATE = EXPR_UNARY_FIRST,
 101         EXPR_UNARY_PLUS,
 102         EXPR_UNARY_BITWISE_NEGATE,
 103         EXPR_UNARY_NOT,
 104         EXPR_UNARY_DEREFERENCE,
 105         EXPR_UNARY_TAKE_ADDRESS,
 106         EXPR_UNARY_POSTFIX_INCREMENT,
 107         EXPR_UNARY_POSTFIX_DECREMENT,
 108         EXPR_UNARY_PREFIX_INCREMENT,
 109         EXPR_UNARY_PREFIX_DECREMENT,
 110         EXPR_UNARY_CAST,
 111         EXPR_UNARY_ASSUME,        /**< MS __assume() */
 112         EXPR_UNARY_DELETE,
 113         EXPR_UNARY_DELETE_ARRAY,
 114         EXPR_UNARY_THROW,
 115         EXPR_UNARY_LAST = EXPR_UNARY_THROW,
 116
 117         EXPR_BINARY_FIRST,
 118         EXPR_BINARY_ADD = EXPR_BINARY_FIRST,
 119         EXPR_BINARY_SUB,
 120         EXPR_BINARY_MUL,
 121         EXPR_BINARY_DIV,
 122         EXPR_BINARY_MOD,
 123         EXPR_BINARY_EQUAL,
 124         EXPR_BINARY_NOTEQUAL,
 125         EXPR_BINARY_LESS,
 126         EXPR_BINARY_LESSEQUAL,
 127         EXPR_BINARY_GREATER,
 128         EXPR_BINARY_GREATEREQUAL,
 129         EXPR_BINARY_BITWISE_AND,
 130         EXPR_BINARY_BITWISE_OR,
 131         EXPR_BINARY_BITWISE_XOR,
 132         EXPR_BINARY_LOGICAL_AND,
 133         EXPR_BINARY_LOGICAL_OR,
 134         EXPR_BINARY_SHIFTLEFT,
 135         EXPR_BINARY_SHIFTRIGHT,
 136         EXPR_BINARY_ASSIGN,
 137         EXPR_BINARY_MUL_ASSIGN,
 138         EXPR_BINARY_DIV_ASSIGN,
 139         EXPR_BINARY_MOD_ASSIGN,
 140         EXPR_BINARY_ADD_ASSIGN,
 141         EXPR_BINARY_SUB_ASSIGN,
 142         EXPR_BINARY_SHIFTLEFT_ASSIGN,
 143         EXPR_BINARY_SHIFTRIGHT_ASSIGN,
 144         EXPR_BINARY_BITWISE_AND_ASSIGN,
 145         EXPR_BINARY_BITWISE_XOR_ASSIGN,
 146         EXPR_BINARY_BITWISE_OR_ASSIGN,
 147         EXPR_BINARY_COMMA,
 148
 149         EXPR_BINARY_ISGREATER,
 150         EXPR_BINARY_ISGREATEREQUAL,
 151         EXPR_BINARY_ISLESS,
 152         EXPR_BINARY_ISLESSEQUAL,
 153         EXPR_BINARY_ISLESSGREATER,
 154         EXPR_BINARY_ISUNORDERED,
 155         EXPR_BINARY_LAST = EXPR_BINARY_ISUNORDERED,
 156 } expression_kind_t;
 157
 158 typedef enum funcname_kind_t {
 159         FUNCNAME_FUNCTION,           /**< C99 __func__, older __FUNCTION__ */
 160         FUNCNAME_PRETTY_FUNCTION,    /**< GNUC __PRETTY_FUNCTION__ */
 161         FUNCNAME_FUNCSIG,            /**< MS __FUNCSIG__ */
 162         FUNCNAME_FUNCDNAME           /**< MS __FUNCDNAME__ */
 163 } funcname_kind_t;
 164
 165 /* convenience macros */
 166 #define EXPR_BINARY_CASES                  \
 167         case EXPR_BINARY_ADD:                  \
 168         case EXPR_BINARY_SUB:                  \
 169         case EXPR_BINARY_MUL:                  \
 170         case EXPR_BINARY_DIV:                  \
 171         case EXPR_BINARY_MOD:                  \
 172         case EXPR_BINARY_EQUAL:                \
 173         case EXPR_BINARY_NOTEQUAL:             \
 174         case EXPR_BINARY_LESS:                 \
 175         case EXPR_BINARY_LESSEQUAL:            \
 176         case EXPR_BINARY_GREATER:              \
 177         case EXPR_BINARY_GREATEREQUAL:         \
 178         case EXPR_BINARY_BITWISE_AND:          \
 179         case EXPR_BINARY_BITWISE_OR:           \
 180         case EXPR_BINARY_BITWISE_XOR:          \
 181         case EXPR_BINARY_LOGICAL_AND:          \
 182         case EXPR_BINARY_LOGICAL_OR:           \
 183         case EXPR_BINARY_SHIFTLEFT:            \
 184         case EXPR_BINARY_SHIFTRIGHT:           \
 185         case EXPR_BINARY_ASSIGN:               \
 186         case EXPR_BINARY_MUL_ASSIGN:           \
 187         case EXPR_BINARY_DIV_ASSIGN:           \
 188         case EXPR_BINARY_MOD_ASSIGN:           \
 189         case EXPR_BINARY_ADD_ASSIGN:           \
 190         case EXPR_BINARY_SUB_ASSIGN:           \
 191         case EXPR_BINARY_SHIFTLEFT_ASSIGN:     \
 192         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:    \
 193         case EXPR_BINARY_BITWISE_AND_ASSIGN:   \
 194         case EXPR_BINARY_BITWISE_XOR_ASSIGN:   \
 195         case EXPR_BINARY_BITWISE_OR_ASSIGN:    \
 196         case EXPR_BINARY_COMMA:                \
 197         case EXPR_BINARY_ISGREATER:            \
 198         case EXPR_BINARY_ISGREATEREQUAL:       \
 199         case EXPR_BINARY_ISLESS:               \
 200         case EXPR_BINARY_ISLESSEQUAL:          \
 201         case EXPR_BINARY_ISLESSGREATER:        \
 202         case EXPR_BINARY_ISUNORDERED:
 203
 204 /**
 205  * unary expression with mandatory operand
 206  */
 207 #define EXPR_UNARY_CASES_MANDATORY         \
 208         case EXPR_UNARY_NEGATE:                \
 209         case EXPR_UNARY_PLUS:                  \
 210         case EXPR_UNARY_BITWISE_NEGATE:        \
 211         case EXPR_UNARY_NOT:                   \
 212         case EXPR_UNARY_DEREFERENCE:           \
 213         case EXPR_UNARY_TAKE_ADDRESS:          \
 214         case EXPR_UNARY_POSTFIX_INCREMENT:     \
 215         case EXPR_UNARY_POSTFIX_DECREMENT:     \
 216         case EXPR_UNARY_PREFIX_INCREMENT:      \
 217         case EXPR_UNARY_PREFIX_DECREMENT:      \
 218         case EXPR_UNARY_CAST:                  \
 219         case EXPR_UNARY_ASSUME:                \
 220         case EXPR_UNARY_DELETE:                \
 221         case EXPR_UNARY_DELETE_ARRAY:
 222
 223 /**
 224  * unary expression with optional operand
 225  */
 226 #define EXPR_UNARY_CASES_OPTIONAL \
 227         case EXPR_UNARY_THROW:        \
 228
 229 #define EXPR_UNARY_CASES       \
 230         EXPR_UNARY_CASES_MANDATORY \
 231         EXPR_UNARY_CASES_OPTIONAL
 232
 233 #define EXPR_LITERAL_CASES                        \
 234         case EXPR_LITERAL_BOOLEAN:                    \
 235         case EXPR_LITERAL_INTEGER:                    \
 236         case EXPR_LITERAL_INTEGER_OCTAL:              \
 237         case EXPR_LITERAL_INTEGER_HEXADECIMAL:        \
 238         case EXPR_LITERAL_FLOATINGPOINT:              \
 239         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL:  \
 240         case EXPR_LITERAL_CHARACTER:                  \
 241         case EXPR_LITERAL_WIDE_CHARACTER:             \
 242         case EXPR_LITERAL_MS_NOOP:
 243
 244 /**
 245  * The base class of every expression.
 246  */
 247 struct expression_base_t {
 248         expression_kind_t   kind;            /**< The expression kind. */
 249         type_t             *type;            /**< The type of the expression. */
 250         source_position_t   source_position; /**< The source position of this expression. */
 251         bool                parenthesized : 1;
 252 #ifndef NDEBUG
 253         bool                transformed : 1;     /**< Set if this expression was transformed. */
 254 #endif
 255         bool                implicit : 1;    /**< compiler generated expression.
 256                                                   Examples:
 257                                                      select into anonymous structs
 258                                                      implicit casts
 259                                               */
 260 };
 261
 262 /**
 263  * integer/float constants, character and string literals
 264  */
 265 struct literal_expression_t {
 266         expression_base_t  base;
 267         string_t           value;
 268         symbol_t          *suffix;
 269
 270         /* ast2firm data */
 271         ir_tarval         *target_value;
 272 };
 273
 274 struct string_literal_expression_t {
 275         expression_base_t  base;
 276         string_t           value;
 277 };
 278
 279 struct funcname_expression_t {
 280         expression_base_t  base;
 281         funcname_kind_t    kind;
 282         string_t           value;     /**< the value once assigned. */
 283 };
 284
 285 struct compound_literal_expression_t {
 286         expression_base_t  base;
 287         type_t            *type;
 288         initializer_t     *initializer;
 289 };
 290
 291 struct builtin_constant_expression_t {
 292         expression_base_t  base;
 293         expression_t      *value;
 294 };
 295
 296 struct builtin_types_compatible_expression_t {
 297         expression_base_t  base;
 298         type_t            *left;
 299         type_t            *right;
 300 };
 301
 302 struct reference_expression_t {
 303         expression_base_t  base;
 304         entity_t          *entity;
 305 };
 306
 307 /**
 308  * An argument of a call.
 309  */
 310 struct call_argument_t {
 311         expression_t    *expression;  /**< The expression which value is transmitted. */
 312         call_argument_t *next;        /**< Links to the next argument of this call. */
 313 };
 314
 315
 316 struct call_expression_t {
 317         expression_base_t  base;
 318         expression_t      *function;  /**< The address of the function to call. */
 319         call_argument_t   *arguments; /**< List of arguments of this call. */
 320 };
 321
 322
 323 struct unary_expression_t {
 324         expression_base_t  base;
 325         expression_t      *value;     /**< The unary operand. */
 326 };
 327
 328 struct binary_expression_t {
 329         expression_base_t  base;
 330         expression_t      *left;
 331         expression_t      *right;
 332 };
 333
 334 struct select_expression_t {
 335         expression_base_t  base;
 336         expression_t      *compound;
 337         entity_t          *compound_entry;
 338 };
 339
 340 struct array_access_expression_t {
 341         expression_base_t  base;
 342         expression_t      *array_ref; /**< the referenced array */
 343         expression_t      *index;     /**< the index used */
 344         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 345 };
 346
 347 struct typeprop_expression_t {
 348         expression_base_t  base;
 349         type_t            *type;
 350         expression_t      *tp_expression;
 351 };
 352
 353 struct designator_t {
 354         source_position_t  source_position;
 355         symbol_t          *symbol;      /**< the symbol if any */
 356         expression_t      *array_index; /**< the array index if any */
 357         designator_t      *next;
 358 };
 359
 360 struct offsetof_expression_t {
 361         expression_base_t  base;
 362         type_t            *type;
 363         designator_t      *designator;
 364 };
 365
 366 struct va_start_expression_t {
 367         expression_base_t  base;
 368         expression_t      *ap;
 369         variable_t        *parameter;
 370 };
 371
 372 struct va_arg_expression_t {
 373         expression_base_t  base;
 374         expression_t      *ap;
 375 };
 376
 377 struct va_copy_expression_t {
 378         expression_base_t  base;
 379         expression_t      *dst;    /**< destination argument */
 380         expression_t      *src;    /**< source argument */
 381 };
 382
 383 struct conditional_expression_t {
 384         expression_base_t  base;
 385         expression_t      *condition;
 386         expression_t      *true_expression;
 387         expression_t      *false_expression;
 388 };
 389
 390 struct statement_expression_t {
 391         expression_base_t  base;
 392         statement_t       *statement;
 393 };
 394
 395 struct classify_type_expression_t {
 396         expression_base_t  base;
 397         expression_t      *type_expression;
 398 };
 399
 400 struct label_address_expression_t {
 401         expression_base_t  base;
 402         label_t           *label;
 403 };
 404
 405 union expression_t {
 406         expression_kind_t                     kind;
 407         expression_base_t                     base;
 408         literal_expression_t                  literal;
 409         string_literal_expression_t           string_literal;
 410         funcname_expression_t                 funcname;
 411         compound_literal_expression_t         compound_literal;
 412         builtin_constant_expression_t         builtin_constant;
 413         builtin_types_compatible_expression_t builtin_types_compatible;
 414         reference_expression_t                reference;
 415         call_expression_t                     call;
 416         unary_expression_t                    unary;
 417         binary_expression_t                   binary;
 418         select_expression_t                   select;
 419         array_access_expression_t             array_access;
 420         typeprop_expression_t                 typeprop;
 421         offsetof_expression_t                 offsetofe;
 422         va_start_expression_t                 va_starte;
 423         va_arg_expression_t                   va_arge;
 424         va_copy_expression_t                  va_copye;
 425         conditional_expression_t              conditional;
 426         statement_expression_t                statement;
 427         classify_type_expression_t            classify_type;
 428         label_address_expression_t            label_address;
 429 };
 430
 431 typedef enum initializer_kind_t {
 432         INITIALIZER_VALUE,
 433         INITIALIZER_LIST,
 434         INITIALIZER_STRING,
 435         INITIALIZER_WIDE_STRING,
 436         INITIALIZER_DESIGNATOR
 437 } initializer_kind_t;
 438
 439 struct initializer_base_t {
 440         initializer_kind_t kind;
 441 };
 442
 443 struct initializer_value_t {
 444         initializer_base_t  base;
 445         expression_t       *value;
 446 };
 447
 448 struct initializer_list_t {
 449         initializer_base_t  base;
 450         size_t              len;
 451         initializer_t      *initializers[];
 452 };
 453
 454 struct initializer_string_t {
 455         initializer_base_t base;
 456         string_t           string;
 457 };
 458
 459 struct initializer_wide_string_t {
 460         initializer_base_t  base;
 461         string_t            string;
 462 };
 463
 464 struct initializer_designator_t {
 465         initializer_base_t  base;
 466         designator_t       *designator;
 467 };
 468
 469 union initializer_t {
 470         initializer_kind_t        kind;
 471         initializer_base_t        base;
 472         initializer_value_t       value;
 473         initializer_list_t        list;
 474         initializer_string_t      string;
 475         initializer_wide_string_t wide_string;
 476         initializer_designator_t  designator;
 477 };
 478
 479 /**
 480  * The statement kinds.
 481  */
 482 typedef enum statement_kind_t {
 483         STATEMENT_INVALID,
 484         STATEMENT_EMPTY,
 485         STATEMENT_COMPOUND,
 486         STATEMENT_RETURN,
 487         STATEMENT_DECLARATION,
 488         STATEMENT_IF,
 489         STATEMENT_SWITCH,
 490         STATEMENT_EXPRESSION,
 491         STATEMENT_CONTINUE,
 492         STATEMENT_BREAK,
 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 invalid_statement_t {
 519         statement_base_t  base;
 520 };
 521
 522 struct empty_statement_t {
 523         statement_base_t  base;
 524 };
 525
 526 struct return_statement_t {
 527         statement_base_t  base;
 528         expression_t     *value;    /**< The return value if any. */
 529 };
 530
 531 struct compound_statement_t {
 532         statement_base_t  base;
 533         statement_t      *statements;
 534         scope_t           scope;
 535         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 536 };
 537
 538 struct declaration_statement_t {
 539         statement_base_t  base;
 540         entity_t         *declarations_begin;
 541         entity_t         *declarations_end;
 542 };
 543
 544 struct if_statement_t {
 545         statement_base_t  base;
 546         expression_t     *condition;
 547         statement_t      *true_statement;
 548         statement_t      *false_statement;
 549 };
 550
 551 struct switch_statement_t {
 552         statement_base_t        base;
 553         expression_t           *expression;
 554         statement_t            *body;
 555         case_label_statement_t *first_case, *last_case;  /**< List of all cases, including default. */
 556         case_label_statement_t *default_label;           /**< The default label if existent. */
 557         unsigned long           default_proj_nr;         /**< The Proj-number for the default Proj. */
 558 };
 559
 560 struct goto_statement_t {
 561         statement_base_t  base;
 562         label_t          *label;         /**< The destination label. */
 563         expression_t     *expression;    /**< The expression for an assigned goto. */
 564         goto_statement_t *next;          /**< links all goto statements of a function */
 565 };
 566
 567 struct case_label_statement_t {
 568         statement_base_t        base;
 569         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 570         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 571         case_label_statement_t *next;          /**< link to the next case label in switch */
 572         statement_t            *statement;
 573         long                   first_case;     /**< The folded value of expression. */
 574         long                   last_case;      /**< The folded value of end_range. */
 575         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 576         bool                   is_empty_range; /**< If set marked this as an empty range. */
 577 };
 578
 579 struct label_statement_t {
 580         statement_base_t   base;
 581         label_t           *label;
 582         statement_t       *statement;
 583         label_statement_t *next;    /**< links all label statements of a function */
 584 };
 585
 586 struct expression_statement_t {
 587         statement_base_t  base;
 588         expression_t     *expression;
 589 };
 590
 591 struct while_statement_t {
 592         statement_base_t  base;
 593         expression_t     *condition;
 594         statement_t      *body;
 595 };
 596
 597 struct do_while_statement_t {
 598         statement_base_t  base;
 599         expression_t     *condition;
 600         statement_t      *body;
 601 };
 602
 603 struct for_statement_t {
 604         statement_base_t  base;
 605         expression_t     *initialisation;
 606         expression_t     *condition;
 607         expression_t     *step;
 608         statement_t      *body;
 609         scope_t           scope;
 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         goto_statement_t         gotos;
 655         case_label_statement_t   case_label;
 656         label_statement_t        label;
 657         expression_statement_t   expression;
 658         while_statement_t        whiles;
 659         do_while_statement_t     do_while;
 660         for_statement_t          fors;
 661         asm_statement_t          asms;
 662         ms_try_statement_t       ms_try;
 663         leave_statement_t        leave;
 664 };
 665
 666 struct translation_unit_t {
 667         scope_t      scope;
 668         statement_t *global_asm;
 669 };
 670
 671 static inline bool is_invalid_expression(expression_t *expression)
 672 {
 673         return expression->base.kind == EXPR_INVALID;
 674 }
 675
 676 static inline bool is_invalid_statement(statement_t *statement)
 677 {
 678         return statement->base.kind == STATEMENT_INVALID;
 679 }
 680
 681 /**
 682  * Allocate an AST node with given size and
 683  * initialize all fields with zero.
 684  */
 685 static inline void *allocate_ast_zero(size_t size)
 686 {
 687         return memset(obstack_alloc(&ast_obstack, size), 0, size);
 688 }
 689
 690 /** If set, implicit casts are printed. */
 691 extern bool print_implicit_casts;
 692 /** If set parenthesis are printed to indicate operator precedence. */
 693 extern bool print_parenthesis;
 694
 695 #endif