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   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2008 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.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_CONST,
  70         EXPR_CHARACTER_CONSTANT,
  71         EXPR_WIDE_CHARACTER_CONSTANT,
  72         EXPR_STRING_LITERAL,
  73         EXPR_WIDE_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_SYMBOL,
  85         EXPR_BUILTIN_CONSTANT_P,
  86         EXPR_BUILTIN_PREFETCH,
  87         EXPR_OFFSETOF,
  88         EXPR_VA_START,
  89         EXPR_VA_ARG,
  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_CAST_IMPLICIT, /**< compiler generated cast */
 106         EXPR_UNARY_ASSUME,        /**< MS __assume() */
 107         EXPR_UNARY_DELETE,
 108         EXPR_UNARY_DELETE_ARRAY,
 109         EXPR_UNARY_THROW,
 110         EXPR_UNARY_LAST = EXPR_UNARY_THROW,
 111
 112         EXPR_BINARY_FIRST,
 113         EXPR_BINARY_ADD = EXPR_BINARY_FIRST,
 114         EXPR_BINARY_SUB,
 115         EXPR_BINARY_MUL,
 116         EXPR_BINARY_DIV,
 117         EXPR_BINARY_MOD,
 118         EXPR_BINARY_EQUAL,
 119         EXPR_BINARY_NOTEQUAL,
 120         EXPR_BINARY_LESS,
 121         EXPR_BINARY_LESSEQUAL,
 122         EXPR_BINARY_GREATER,
 123         EXPR_BINARY_GREATEREQUAL,
 124         EXPR_BINARY_BITWISE_AND,
 125         EXPR_BINARY_BITWISE_OR,
 126         EXPR_BINARY_BITWISE_XOR,
 127         EXPR_BINARY_LOGICAL_AND,
 128         EXPR_BINARY_LOGICAL_OR,
 129         EXPR_BINARY_SHIFTLEFT,
 130         EXPR_BINARY_SHIFTRIGHT,
 131         EXPR_BINARY_ASSIGN,
 132         EXPR_BINARY_MUL_ASSIGN,
 133         EXPR_BINARY_DIV_ASSIGN,
 134         EXPR_BINARY_MOD_ASSIGN,
 135         EXPR_BINARY_ADD_ASSIGN,
 136         EXPR_BINARY_SUB_ASSIGN,
 137         EXPR_BINARY_SHIFTLEFT_ASSIGN,
 138         EXPR_BINARY_SHIFTRIGHT_ASSIGN,
 139         EXPR_BINARY_BITWISE_AND_ASSIGN,
 140         EXPR_BINARY_BITWISE_XOR_ASSIGN,
 141         EXPR_BINARY_BITWISE_OR_ASSIGN,
 142         EXPR_BINARY_COMMA,
 143
 144         EXPR_BINARY_BUILTIN_EXPECT,
 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         case 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_BUILTIN_EXPECT:       \
 194         case EXPR_BINARY_ISGREATER:            \
 195         case EXPR_BINARY_ISGREATEREQUAL:       \
 196         case EXPR_BINARY_ISLESS:               \
 197         case EXPR_BINARY_ISLESSEQUAL:          \
 198         case EXPR_BINARY_ISLESSGREATER:        \
 199         case EXPR_BINARY_ISUNORDERED:
 200
 201 /**
 202  * unary expression with mandatory operand
 203  */
 204 #define EXPR_UNARY_CASES_MANDATORY         \
 205         case EXPR_UNARY_NEGATE:                \
 206         case EXPR_UNARY_PLUS:                  \
 207         case EXPR_UNARY_BITWISE_NEGATE:        \
 208         case EXPR_UNARY_NOT:                   \
 209         case EXPR_UNARY_DEREFERENCE:           \
 210         case EXPR_UNARY_TAKE_ADDRESS:          \
 211         case EXPR_UNARY_POSTFIX_INCREMENT:     \
 212         case EXPR_UNARY_POSTFIX_DECREMENT:     \
 213         case EXPR_UNARY_PREFIX_INCREMENT:      \
 214         case EXPR_UNARY_PREFIX_DECREMENT:      \
 215         case EXPR_UNARY_CAST:                  \
 216         case EXPR_UNARY_CAST_IMPLICIT:         \
 217         case EXPR_UNARY_ASSUME:                \
 218         case EXPR_UNARY_DELETE:                \
 219         case EXPR_UNARY_DELETE_ARRAY:
 220
 221 /**
 222  * unary expression with optinal operand
 223  */
 224 #define EXPR_UNARY_CASES_OPTIONAL \
 225         case EXPR_UNARY_THROW:        \
 226
 227 #define EXPR_UNARY_CASES       \
 228         EXPR_UNARY_CASES_MANDATORY \
 229         EXPR_UNARY_CASES_OPTIONAL
 230
 231 /**
 232  * A scope containing declarations.
 233  */
 234 struct scope_t {
 235         entity_t *entities;     /**< List of declarations in this scope. */
 236         entity_t *last_entity;  /**< last declaration in this scope. */
 237         scope_t  *parent;       /**< points to the parent scope. */
 238         unsigned  depth;        /**< while parsing, the depth of this scope in the scope stack. */
 239 };
 240
 241 struct expression_base_t {
 242         expression_kind_t   kind;
 243         type_t             *type;
 244         source_position_t   source_position;
 245 #ifndef NDEBUG
 246         bool                transformed;
 247 #endif
 248 };
 249
 250 struct const_expression_t {
 251         expression_base_t  base;
 252         union {
 253                 long long      int_value;
 254                 long double    float_value;
 255                 string_t       character;
 256                 wide_string_t  wide_character;
 257         } v;
 258         bool               is_ms_noop;  /**< True, if this constant is the result
 259                                              of an microsoft __noop operator */
 260 };
 261
 262 struct string_literal_expression_t {
 263         expression_base_t  base;
 264         string_t           value;
 265 };
 266
 267 struct funcname_expression_t {
 268         expression_base_t  base;
 269         funcname_kind_t    kind;
 270         string_t           value;     /**< the value once assigned. */
 271 };
 272
 273 struct wide_string_literal_expression_t {
 274         expression_base_t  base;
 275         wide_string_t      value;
 276 };
 277
 278 struct compound_literal_expression_t {
 279         expression_base_t  base;
 280         type_t            *type;
 281         initializer_t     *initializer;
 282 };
 283
 284 struct builtin_symbol_expression_t {
 285         expression_base_t  base;
 286         symbol_t          *symbol;
 287 };
 288
 289 struct builtin_constant_expression_t {
 290         expression_base_t  base;
 291         expression_t      *value;
 292 };
 293
 294 struct builtin_prefetch_expression_t {
 295         expression_base_t  base;
 296         expression_t      *adr;
 297         expression_t      *rw;
 298         expression_t      *locality;
 299 };
 300
 301 struct reference_expression_t {
 302         expression_base_t  base;
 303         entity_t          *entity;
 304 };
 305
 306 struct call_argument_t {
 307         expression_t    *expression;
 308         call_argument_t *next;
 309 };
 310
 311 struct call_expression_t {
 312         expression_base_t  base;
 313         expression_t      *function;
 314         call_argument_t   *arguments;
 315 };
 316
 317 struct unary_expression_t {
 318         expression_base_t  base;
 319         expression_t      *value;
 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;
 337         expression_t      *index;
 338         bool               flipped; /**< 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         source_position_t  source_position;
 349         symbol_t          *symbol;
 350         expression_t      *array_index;
 351         designator_t      *next;
 352 };
 353
 354 struct offsetof_expression_t {
 355         expression_base_t  base;
 356         type_t            *type;
 357         designator_t      *designator;
 358 };
 359
 360 struct va_start_expression_t {
 361         expression_base_t  base;
 362         expression_t      *ap;
 363         variable_t        *parameter;
 364 };
 365
 366 struct va_arg_expression_t {
 367         expression_base_t  base;
 368         expression_t      *ap;
 369 };
 370
 371 struct conditional_expression_t {
 372         expression_base_t  base;
 373         expression_t      *condition;
 374         expression_t      *true_expression;
 375         expression_t      *false_expression;
 376 };
 377
 378 struct statement_expression_t {
 379         expression_base_t  base;
 380         statement_t       *statement;
 381 };
 382
 383 struct classify_type_expression_t {
 384         expression_base_t  base;
 385         expression_t      *type_expression;
 386 };
 387
 388 struct label_address_expression_t {
 389         expression_base_t  base;
 390         label_t           *label;
 391 };
 392
 393 union expression_t {
 394         expression_kind_t                kind;
 395         expression_base_t                base;
 396         const_expression_t               conste;
 397         funcname_expression_t            funcname;
 398         string_literal_expression_t      string;
 399         wide_string_literal_expression_t wide_string;
 400         compound_literal_expression_t    compound_literal;
 401         builtin_symbol_expression_t      builtin_symbol;
 402         builtin_constant_expression_t    builtin_constant;
 403         builtin_prefetch_expression_t    builtin_prefetch;
 404         reference_expression_t           reference;
 405         call_expression_t                call;
 406         unary_expression_t               unary;
 407         binary_expression_t              binary;
 408         select_expression_t              select;
 409         array_access_expression_t        array_access;
 410         typeprop_expression_t            typeprop;
 411         offsetof_expression_t            offsetofe;
 412         va_start_expression_t            va_starte;
 413         va_arg_expression_t              va_arge;
 414         conditional_expression_t         conditional;
 415         statement_expression_t           statement;
 416         classify_type_expression_t       classify_type;
 417         label_address_expression_t       label_address;
 418 };
 419
 420 typedef enum initializer_kind_t {
 421         INITIALIZER_VALUE,
 422         INITIALIZER_LIST,
 423         INITIALIZER_STRING,
 424         INITIALIZER_WIDE_STRING,
 425         INITIALIZER_DESIGNATOR
 426 } initializer_kind_t;
 427
 428 struct initializer_base_t {
 429         initializer_kind_t kind;
 430 };
 431
 432 struct initializer_value_t {
 433         initializer_base_t  base;
 434         expression_t       *value;
 435 };
 436
 437 struct initializer_list_t {
 438         initializer_base_t  base;
 439         size_t              len;
 440         initializer_t      *initializers[];
 441 };
 442
 443 struct initializer_string_t {
 444         initializer_base_t base;
 445         string_t           string;
 446 };
 447
 448 struct initializer_wide_string_t {
 449         initializer_base_t  base;
 450         wide_string_t       string;
 451 };
 452
 453 struct initializer_designator_t {
 454         initializer_base_t  base;
 455         designator_t       *designator;
 456 };
 457
 458 union initializer_t {
 459         initializer_kind_t        kind;
 460         initializer_base_t        base;
 461         initializer_value_t       value;
 462         initializer_list_t        list;
 463         initializer_string_t      string;
 464         initializer_wide_string_t wide_string;
 465         initializer_designator_t  designator;
 466 };
 467
 468 /**
 469  * GNU attributes.
 470  */
 471 typedef enum gnu_attribute_kind_t {
 472         GNU_AK_CONST,
 473         GNU_AK_VOLATILE,
 474         GNU_AK_CDECL,
 475         GNU_AK_STDCALL,
 476         GNU_AK_FASTCALL,
 477         GNU_AK_DEPRECATED,
 478         GNU_AK_NOINLINE,
 479         GNU_AK_NORETURN,
 480         GNU_AK_NAKED,
 481         GNU_AK_PURE,
 482         GNU_AK_ALWAYS_INLINE,
 483         GNU_AK_MALLOC,
 484         GNU_AK_WEAK,
 485         GNU_AK_CONSTRUCTOR,
 486         GNU_AK_DESTRUCTOR,
 487         GNU_AK_NOTHROW,
 488         GNU_AK_TRANSPARENT_UNION,
 489         GNU_AK_COMMON,
 490         GNU_AK_NOCOMMON,
 491         GNU_AK_PACKED,
 492         GNU_AK_SHARED,
 493         GNU_AK_NOTSHARED,
 494         GNU_AK_USED,
 495         GNU_AK_UNUSED,
 496         GNU_AK_NO_INSTRUMENT_FUNCTION,
 497         GNU_AK_WARN_UNUSED_RESULT,
 498         GNU_AK_LONGCALL,
 499         GNU_AK_SHORTCALL,
 500         GNU_AK_LONG_CALL,
 501         GNU_AK_SHORT_CALL,
 502         GNU_AK_FUNCTION_VECTOR,
 503         GNU_AK_INTERRUPT,
 504         GNU_AK_INTERRUPT_HANDLER,
 505         GNU_AK_NMI_HANDLER,
 506         GNU_AK_NESTING,
 507         GNU_AK_NEAR,
 508         GNU_AK_FAR,
 509         GNU_AK_SIGNAL,
 510         GNU_AK_EIGTHBIT_DATA,
 511         GNU_AK_TINY_DATA,
 512         GNU_AK_SAVEALL,
 513         GNU_AK_FLATTEN,
 514         GNU_AK_SSEREGPARM,
 515         GNU_AK_EXTERNALLY_VISIBLE,
 516         GNU_AK_RETURN_TWICE,
 517         GNU_AK_MAY_ALIAS,
 518         GNU_AK_MS_STRUCT,
 519         GNU_AK_GCC_STRUCT,
 520         GNU_AK_DLLIMPORT,
 521         GNU_AK_DLLEXPORT,
 522         GNU_AK_ALIGNED,
 523         GNU_AK_ALIAS,
 524         GNU_AK_SECTION,
 525         GNU_AK_FORMAT,
 526         GNU_AK_FORMAT_ARG,
 527         GNU_AK_WEAKREF,
 528         GNU_AK_NONNULL,
 529         GNU_AK_TLS_MODEL,
 530         GNU_AK_VISIBILITY,
 531         GNU_AK_REGPARM,
 532         GNU_AK_MODEL,
 533         GNU_AK_MODE,
 534         GNU_AK_TRAP_EXIT,
 535         GNU_AK_SP_SWITCH,
 536         GNU_AK_SENTINEL,
 537         GNU_AK_LAST
 538 } gnu_attribute_kind_t;
 539
 540 typedef enum statement_kind_t {
 541         STATEMENT_INVALID,
 542         STATEMENT_EMPTY,
 543         STATEMENT_COMPOUND,
 544         STATEMENT_RETURN,
 545         STATEMENT_DECLARATION,
 546         STATEMENT_LOCAL_LABEL,
 547         STATEMENT_IF,
 548         STATEMENT_SWITCH,
 549         STATEMENT_EXPRESSION,
 550         STATEMENT_CONTINUE,
 551         STATEMENT_BREAK,
 552         STATEMENT_GOTO,
 553         STATEMENT_LABEL,
 554         STATEMENT_CASE_LABEL,
 555         STATEMENT_WHILE,
 556         STATEMENT_DO_WHILE,
 557         STATEMENT_FOR,
 558         STATEMENT_ASM,
 559         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 560         STATEMENT_LEAVE            /**< MS __leave */
 561 } statement_kind_t;
 562
 563 struct statement_base_t {
 564         statement_kind_t   kind;
 565         statement_t       *next;
 566         source_position_t  source_position;
 567         statement_t       *parent;
 568         bool               reachable;
 569 #ifndef NDEBUG
 570         bool               transformed;
 571 #endif
 572 };
 573
 574 struct invalid_statement_t {
 575         statement_base_t  base;
 576 };
 577
 578 struct empty_statement_t {
 579         statement_base_t  base;
 580 };
 581
 582 struct return_statement_t {
 583         statement_base_t  base;
 584         expression_t     *value;
 585 };
 586
 587 struct compound_statement_t {
 588         statement_base_t  base;
 589         statement_t      *statements;
 590         scope_t           scope;
 591 };
 592
 593 struct declaration_statement_t {
 594         statement_base_t  base;
 595         entity_t         *declarations_begin;
 596         entity_t         *declarations_end;
 597 };
 598
 599 struct local_label_statement_t {
 600         statement_base_t  base;
 601         entity_t         *labels_begin;
 602         entity_t         *labels_end;
 603 };
 604
 605 struct if_statement_t {
 606         statement_base_t  base;
 607         expression_t     *condition;
 608         statement_t      *true_statement;
 609         statement_t      *false_statement;
 610 };
 611
 612 struct switch_statement_t {
 613         statement_base_t        base;
 614         expression_t           *expression;
 615         statement_t            *body;
 616         case_label_statement_t *first_case, *last_case;  /**< List of all cases, including default. */
 617         case_label_statement_t *default_label;           /**< The default label if existent. */
 618         unsigned long           default_proj_nr;         /**< The Proj-number for the default Proj. */
 619 };
 620
 621 struct goto_statement_t {
 622         statement_base_t  base;
 623         label_t          *label;         /**< The destination label. */
 624         expression_t     *expression;    /**< The expression for an assigned goto. */
 625         goto_statement_t *next;          /**< links all goto statements of a function */
 626 };
 627
 628 struct case_label_statement_t {
 629         statement_base_t        base;
 630         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 631         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 632         case_label_statement_t *next;          /**< link to the next case label in switch */
 633         statement_t            *statement;
 634         long                   first_case;     /**< The folded value of expression. */
 635         long                   last_case;      /**< The folded value of end_range. */
 636         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 637         bool                   is_empty_range; /**< If set marked this as an empty range. */
 638 };
 639
 640 struct label_statement_t {
 641         statement_base_t   base;
 642         label_t           *label;
 643         statement_t       *statement;
 644         label_statement_t *next;    /**< links all label statements of a function */
 645 };
 646
 647 struct expression_statement_t {
 648         statement_base_t  base;
 649         expression_t     *expression;
 650 };
 651
 652 struct while_statement_t {
 653         statement_base_t  base;
 654         expression_t     *condition;
 655         statement_t      *body;
 656 };
 657
 658 struct do_while_statement_t {
 659         statement_base_t  base;
 660         expression_t     *condition;
 661         statement_t      *body;
 662 };
 663
 664 struct for_statement_t {
 665         statement_base_t  base;
 666         expression_t     *initialisation;
 667         expression_t     *condition;
 668         expression_t     *step;
 669         statement_t      *body;
 670         scope_t           scope;
 671         bool              condition_reachable:1;
 672         bool              step_reachable:1;
 673 };
 674
 675 struct asm_argument_t {
 676         string_t        constraints;
 677         expression_t   *expression;
 678         symbol_t       *symbol;
 679         asm_argument_t *next;
 680 };
 681
 682 struct asm_clobber_t {
 683         string_t       clobber;
 684         asm_clobber_t *next;
 685 };
 686
 687 struct asm_statement_t {
 688         statement_base_t base;
 689         string_t         asm_text;
 690         asm_argument_t  *inputs;
 691         asm_argument_t  *outputs;
 692         asm_clobber_t   *clobbers;
 693         bool             is_volatile;
 694 };
 695
 696 struct ms_try_statement_t {
 697         statement_base_t  base;
 698         statement_t      *try_statement;
 699         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 700         statement_t      *final_statement;
 701 };
 702
 703 struct leave_statement_t {
 704         statement_base_t  base;
 705 };
 706
 707 union statement_t {
 708         statement_kind_t         kind;
 709         statement_base_t         base;
 710         return_statement_t       returns;
 711         compound_statement_t     compound;
 712         declaration_statement_t  declaration;
 713         local_label_statement_t  local_label;
 714         if_statement_t           ifs;
 715         switch_statement_t       switchs;
 716         goto_statement_t         gotos;
 717         case_label_statement_t   case_label;
 718         label_statement_t        label;
 719         expression_statement_t   expression;
 720         while_statement_t        whiles;
 721         do_while_statement_t     do_while;
 722         for_statement_t          fors;
 723         asm_statement_t          asms;
 724         ms_try_statement_t       ms_try;
 725         leave_statement_t        leave;
 726 };
 727
 728 struct translation_unit_t {
 729         scope_t      scope;
 730         statement_t *global_asm;
 731 };
 732
 733 static inline
 734 void *_allocate_ast(size_t size)
 735 {
 736         return obstack_alloc(&ast_obstack, size);
 737 }
 738
 739 static inline
 740 bool is_invalid_expression(expression_t *expression)
 741 {
 742         return expression->base.kind == EXPR_INVALID;
 743 }
 744
 745 static inline
 746 bool is_invalid_statement(statement_t *statement)
 747 {
 748         return statement->base.kind == STATEMENT_INVALID;
 749 }
 750
 751
 752 #define allocate_ast(size)                 _allocate_ast(size)
 753
 754 #endif