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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_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_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 struct expression_base_t {
 232         expression_kind_t   kind;
 233         type_t             *type;
 234         source_position_t   source_position;
 235 #ifndef NDEBUG
 236         bool                transformed;
 237 #endif
 238 };
 239
 240 struct const_expression_t {
 241         expression_base_t  base;
 242         union {
 243                 long long      int_value;
 244                 long double    float_value;
 245                 string_t       character;
 246                 wide_string_t  wide_character;
 247         } v;
 248         bool               is_ms_noop;  /**< True, if this constant is the result
 249                                              of an microsoft __noop operator */
 250 };
 251
 252 struct string_literal_expression_t {
 253         expression_base_t  base;
 254         string_t           value;
 255 };
 256
 257 struct funcname_expression_t {
 258         expression_base_t  base;
 259         funcname_kind_t    kind;
 260         string_t           value;     /**< the value once assigned. */
 261 };
 262
 263 struct wide_string_literal_expression_t {
 264         expression_base_t  base;
 265         wide_string_t      value;
 266 };
 267
 268 struct compound_literal_expression_t {
 269         expression_base_t  base;
 270         type_t            *type;
 271         initializer_t     *initializer;
 272 };
 273
 274 struct builtin_symbol_expression_t {
 275         expression_base_t  base;
 276         symbol_t          *symbol;
 277 };
 278
 279 struct builtin_constant_expression_t {
 280         expression_base_t  base;
 281         expression_t      *value;
 282 };
 283
 284 struct builtin_prefetch_expression_t {
 285         expression_base_t  base;
 286         expression_t      *adr;
 287         expression_t      *rw;
 288         expression_t      *locality;
 289 };
 290
 291 struct reference_expression_t {
 292         expression_base_t  base;
 293         entity_t          *entity;
 294 };
 295
 296 struct call_argument_t {
 297         expression_t    *expression;
 298         call_argument_t *next;
 299 };
 300
 301 struct call_expression_t {
 302         expression_base_t  base;
 303         expression_t      *function;
 304         call_argument_t   *arguments;
 305 };
 306
 307 struct unary_expression_t {
 308         expression_base_t  base;
 309         expression_t      *value;
 310 };
 311
 312 struct binary_expression_t {
 313         expression_base_t  base;
 314         expression_t      *left;
 315         expression_t      *right;
 316 };
 317
 318 struct select_expression_t {
 319         expression_base_t  base;
 320         expression_t      *compound;
 321         entity_t          *compound_entry;
 322 };
 323
 324 struct array_access_expression_t {
 325         expression_base_t  base;
 326         expression_t      *array_ref;
 327         expression_t      *index;
 328         bool               flipped; /**< index/ref was written in a 5[a] way */
 329 };
 330
 331 struct typeprop_expression_t {
 332         expression_base_t  base;
 333         type_t            *type;
 334         expression_t      *tp_expression;
 335 };
 336
 337 struct designator_t {
 338         source_position_t  source_position;
 339         symbol_t          *symbol;
 340         expression_t      *array_index;
 341         designator_t      *next;
 342 };
 343
 344 struct offsetof_expression_t {
 345         expression_base_t  base;
 346         type_t            *type;
 347         designator_t      *designator;
 348 };
 349
 350 struct va_start_expression_t {
 351         expression_base_t  base;
 352         expression_t      *ap;
 353         variable_t        *parameter;
 354 };
 355
 356 struct va_arg_expression_t {
 357         expression_base_t  base;
 358         expression_t      *ap;
 359 };
 360
 361 struct conditional_expression_t {
 362         expression_base_t  base;
 363         expression_t      *condition;
 364         expression_t      *true_expression;
 365         expression_t      *false_expression;
 366 };
 367
 368 struct statement_expression_t {
 369         expression_base_t  base;
 370         statement_t       *statement;
 371 };
 372
 373 struct classify_type_expression_t {
 374         expression_base_t  base;
 375         expression_t      *type_expression;
 376 };
 377
 378 struct label_address_expression_t {
 379         expression_base_t  base;
 380         label_t           *label;
 381 };
 382
 383 union expression_t {
 384         expression_kind_t                kind;
 385         expression_base_t                base;
 386         const_expression_t               conste;
 387         funcname_expression_t            funcname;
 388         string_literal_expression_t      string;
 389         wide_string_literal_expression_t wide_string;
 390         compound_literal_expression_t    compound_literal;
 391         builtin_symbol_expression_t      builtin_symbol;
 392         builtin_constant_expression_t    builtin_constant;
 393         builtin_prefetch_expression_t    builtin_prefetch;
 394         reference_expression_t           reference;
 395         call_expression_t                call;
 396         unary_expression_t               unary;
 397         binary_expression_t              binary;
 398         select_expression_t              select;
 399         array_access_expression_t        array_access;
 400         typeprop_expression_t            typeprop;
 401         offsetof_expression_t            offsetofe;
 402         va_start_expression_t            va_starte;
 403         va_arg_expression_t              va_arge;
 404         conditional_expression_t         conditional;
 405         statement_expression_t           statement;
 406         classify_type_expression_t       classify_type;
 407         label_address_expression_t       label_address;
 408 };
 409
 410 typedef enum initializer_kind_t {
 411         INITIALIZER_VALUE,
 412         INITIALIZER_LIST,
 413         INITIALIZER_STRING,
 414         INITIALIZER_WIDE_STRING,
 415         INITIALIZER_DESIGNATOR
 416 } initializer_kind_t;
 417
 418 struct initializer_base_t {
 419         initializer_kind_t kind;
 420 };
 421
 422 struct initializer_value_t {
 423         initializer_base_t  base;
 424         expression_t       *value;
 425 };
 426
 427 struct initializer_list_t {
 428         initializer_base_t  base;
 429         size_t              len;
 430         initializer_t      *initializers[];
 431 };
 432
 433 struct initializer_string_t {
 434         initializer_base_t base;
 435         string_t           string;
 436 };
 437
 438 struct initializer_wide_string_t {
 439         initializer_base_t  base;
 440         wide_string_t       string;
 441 };
 442
 443 struct initializer_designator_t {
 444         initializer_base_t  base;
 445         designator_t       *designator;
 446 };
 447
 448 union initializer_t {
 449         initializer_kind_t        kind;
 450         initializer_base_t        base;
 451         initializer_value_t       value;
 452         initializer_list_t        list;
 453         initializer_string_t      string;
 454         initializer_wide_string_t wide_string;
 455         initializer_designator_t  designator;
 456 };
 457
 458 /**
 459  * GNU attributes.
 460  */
 461 typedef enum gnu_attribute_kind_t {
 462         GNU_AK_CONST,
 463         GNU_AK_VOLATILE,
 464         GNU_AK_CDECL,
 465         GNU_AK_STDCALL,
 466         GNU_AK_FASTCALL,
 467         GNU_AK_DEPRECATED,
 468         GNU_AK_NOINLINE,
 469         GNU_AK_NORETURN,
 470         GNU_AK_NAKED,
 471         GNU_AK_PURE,
 472         GNU_AK_ALWAYS_INLINE,
 473         GNU_AK_MALLOC,
 474         GNU_AK_WEAK,
 475         GNU_AK_CONSTRUCTOR,
 476         GNU_AK_DESTRUCTOR,
 477         GNU_AK_NOTHROW,
 478         GNU_AK_TRANSPARENT_UNION,
 479         GNU_AK_COMMON,
 480         GNU_AK_NOCOMMON,
 481         GNU_AK_PACKED,
 482         GNU_AK_SHARED,
 483         GNU_AK_NOTSHARED,
 484         GNU_AK_USED,
 485         GNU_AK_UNUSED,
 486         GNU_AK_NO_INSTRUMENT_FUNCTION,
 487         GNU_AK_WARN_UNUSED_RESULT,
 488         GNU_AK_LONGCALL,
 489         GNU_AK_SHORTCALL,
 490         GNU_AK_LONG_CALL,
 491         GNU_AK_SHORT_CALL,
 492         GNU_AK_FUNCTION_VECTOR,
 493         GNU_AK_INTERRUPT,
 494         GNU_AK_INTERRUPT_HANDLER,
 495         GNU_AK_NMI_HANDLER,
 496         GNU_AK_NESTING,
 497         GNU_AK_NEAR,
 498         GNU_AK_FAR,
 499         GNU_AK_SIGNAL,
 500         GNU_AK_EIGTHBIT_DATA,
 501         GNU_AK_TINY_DATA,
 502         GNU_AK_SAVEALL,
 503         GNU_AK_FLATTEN,
 504         GNU_AK_SSEREGPARM,
 505         GNU_AK_EXTERNALLY_VISIBLE,
 506         GNU_AK_RETURN_TWICE,
 507         GNU_AK_MAY_ALIAS,
 508         GNU_AK_MS_STRUCT,
 509         GNU_AK_GCC_STRUCT,
 510         GNU_AK_DLLIMPORT,
 511         GNU_AK_DLLEXPORT,
 512         GNU_AK_ALIGNED,
 513         GNU_AK_ALIAS,
 514         GNU_AK_SECTION,
 515         GNU_AK_FORMAT,
 516         GNU_AK_FORMAT_ARG,
 517         GNU_AK_WEAKREF,
 518         GNU_AK_NONNULL,
 519         GNU_AK_TLS_MODEL,
 520         GNU_AK_VISIBILITY,
 521         GNU_AK_REGPARM,
 522         GNU_AK_MODEL,
 523         GNU_AK_MODE,
 524         GNU_AK_TRAP_EXIT,
 525         GNU_AK_SP_SWITCH,
 526         GNU_AK_SENTINEL,
 527         GNU_AK_LAST
 528 } gnu_attribute_kind_t;
 529
 530 typedef enum statement_kind_t {
 531         STATEMENT_INVALID,
 532         STATEMENT_EMPTY,
 533         STATEMENT_COMPOUND,
 534         STATEMENT_RETURN,
 535         STATEMENT_DECLARATION,
 536         STATEMENT_LOCAL_LABEL,
 537         STATEMENT_IF,
 538         STATEMENT_SWITCH,
 539         STATEMENT_EXPRESSION,
 540         STATEMENT_CONTINUE,
 541         STATEMENT_BREAK,
 542         STATEMENT_GOTO,
 543         STATEMENT_LABEL,
 544         STATEMENT_CASE_LABEL,
 545         STATEMENT_WHILE,
 546         STATEMENT_DO_WHILE,
 547         STATEMENT_FOR,
 548         STATEMENT_ASM,
 549         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 550         STATEMENT_LEAVE            /**< MS __leave */
 551 } statement_kind_t;
 552
 553 struct statement_base_t {
 554         statement_kind_t   kind;
 555         statement_t       *next;
 556         source_position_t  source_position;
 557         statement_t       *parent;
 558         bool               reachable;
 559 #ifndef NDEBUG
 560         bool               transformed;
 561 #endif
 562 };
 563
 564 struct invalid_statement_t {
 565         statement_base_t  base;
 566 };
 567
 568 struct empty_statement_t {
 569         statement_base_t  base;
 570 };
 571
 572 struct return_statement_t {
 573         statement_base_t  base;
 574         expression_t     *value;
 575 };
 576
 577 struct compound_statement_t {
 578         statement_base_t  base;
 579         statement_t      *statements;
 580         scope_t           scope;
 581 };
 582
 583 struct declaration_statement_t {
 584         statement_base_t  base;
 585         entity_t         *declarations_begin;
 586         entity_t         *declarations_end;
 587 };
 588
 589 struct local_label_statement_t {
 590         statement_base_t  base;
 591         entity_t         *labels_begin;
 592         entity_t         *labels_end;
 593 };
 594
 595 struct if_statement_t {
 596         statement_base_t  base;
 597         expression_t     *condition;
 598         statement_t      *true_statement;
 599         statement_t      *false_statement;
 600 };
 601
 602 struct switch_statement_t {
 603         statement_base_t        base;
 604         expression_t           *expression;
 605         statement_t            *body;
 606         case_label_statement_t *first_case, *last_case;  /**< List of all cases, including default. */
 607         case_label_statement_t *default_label;           /**< The default label if existent. */
 608         unsigned long           default_proj_nr;         /**< The Proj-number for the default Proj. */
 609 };
 610
 611 struct goto_statement_t {
 612         statement_base_t  base;
 613         label_t          *label;         /**< The destination label. */
 614         expression_t     *expression;    /**< The expression for an assigned goto. */
 615         goto_statement_t *next;          /**< links all goto statements of a function */
 616 };
 617
 618 struct case_label_statement_t {
 619         statement_base_t        base;
 620         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 621         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 622         case_label_statement_t *next;          /**< link to the next case label in switch */
 623         statement_t            *statement;
 624         long                   first_case;     /**< The folded value of expression. */
 625         long                   last_case;      /**< The folded value of end_range. */
 626         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 627         bool                   is_empty_range; /**< If set marked this as an empty range. */
 628 };
 629
 630 struct label_statement_t {
 631         statement_base_t   base;
 632         label_t           *label;
 633         statement_t       *statement;
 634         label_statement_t *next;    /**< links all label statements of a function */
 635 };
 636
 637 struct expression_statement_t {
 638         statement_base_t  base;
 639         expression_t     *expression;
 640 };
 641
 642 struct while_statement_t {
 643         statement_base_t  base;
 644         expression_t     *condition;
 645         statement_t      *body;
 646 };
 647
 648 struct do_while_statement_t {
 649         statement_base_t  base;
 650         expression_t     *condition;
 651         statement_t      *body;
 652 };
 653
 654 struct for_statement_t {
 655         statement_base_t  base;
 656         expression_t     *initialisation;
 657         expression_t     *condition;
 658         expression_t     *step;
 659         statement_t      *body;
 660         scope_t           scope;
 661         bool              condition_reachable:1;
 662         bool              step_reachable:1;
 663 };
 664
 665 struct asm_argument_t {
 666         string_t        constraints;
 667         expression_t   *expression;
 668         symbol_t       *symbol;
 669         asm_argument_t *next;
 670 };
 671
 672 struct asm_clobber_t {
 673         string_t       clobber;
 674         asm_clobber_t *next;
 675 };
 676
 677 struct asm_statement_t {
 678         statement_base_t base;
 679         string_t         asm_text;
 680         asm_argument_t  *inputs;
 681         asm_argument_t  *outputs;
 682         asm_clobber_t   *clobbers;
 683         bool             is_volatile;
 684 };
 685
 686 struct ms_try_statement_t {
 687         statement_base_t  base;
 688         statement_t      *try_statement;
 689         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 690         statement_t      *final_statement;
 691 };
 692
 693 struct leave_statement_t {
 694         statement_base_t  base;
 695 };
 696
 697 union statement_t {
 698         statement_kind_t         kind;
 699         statement_base_t         base;
 700         return_statement_t       returns;
 701         compound_statement_t     compound;
 702         declaration_statement_t  declaration;
 703         local_label_statement_t  local_label;
 704         if_statement_t           ifs;
 705         switch_statement_t       switchs;
 706         goto_statement_t         gotos;
 707         case_label_statement_t   case_label;
 708         label_statement_t        label;
 709         expression_statement_t   expression;
 710         while_statement_t        whiles;
 711         do_while_statement_t     do_while;
 712         for_statement_t          fors;
 713         asm_statement_t          asms;
 714         ms_try_statement_t       ms_try;
 715         leave_statement_t        leave;
 716 };
 717
 718 struct translation_unit_t {
 719         scope_t      scope;
 720         statement_t *global_asm;
 721 };
 722
 723 static inline
 724 void *_allocate_ast(size_t size)
 725 {
 726         return obstack_alloc(&ast_obstack, size);
 727 }
 728
 729 static inline
 730 bool is_invalid_expression(expression_t *expression)
 731 {
 732         return expression->base.kind == EXPR_INVALID;
 733 }
 734
 735 static inline
 736 bool is_invalid_statement(statement_t *statement)
 737 {
 738         return statement->base.kind == STATEMENT_INVALID;
 739 }
 740
 741
 742 #define allocate_ast(size)                 _allocate_ast(size)
 743
 744 #endif