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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_ISGREATER,
 145         EXPR_BINARY_ISGREATEREQUAL,
 146         EXPR_BINARY_ISLESS,
 147         EXPR_BINARY_ISLESSEQUAL,
 148         EXPR_BINARY_ISLESSGREATER,
 149         EXPR_BINARY_ISUNORDERED,
 150         EXPR_BINARY_LAST = EXPR_BINARY_ISUNORDERED,
 151 } expression_kind_t;
 152
 153 typedef enum funcname_kind_t {
 154         FUNCNAME_FUNCTION,           /**< C99 __func__, older __FUNCTION__ */
 155         FUNCNAME_PRETTY_FUNCTION,    /**< GNUC __PRETTY_FUNCTION__ */
 156         FUNCNAME_FUNCSIG,            /**< MS __FUNCSIG__ */
 157         FUNCNAME_FUNCDNAME           /**< MS __FUNCDNAME__ */
 158 } funcname_kind_t;
 159
 160 /* convenience macros */
 161 #define EXPR_BINARY_CASES                  \
 162         case EXPR_BINARY_ADD:                  \
 163         case EXPR_BINARY_SUB:                  \
 164         case EXPR_BINARY_MUL:                  \
 165         case EXPR_BINARY_DIV:                  \
 166         case EXPR_BINARY_MOD:                  \
 167         case EXPR_BINARY_EQUAL:                \
 168         case EXPR_BINARY_NOTEQUAL:             \
 169         case EXPR_BINARY_LESS:                 \
 170         case EXPR_BINARY_LESSEQUAL:            \
 171         case EXPR_BINARY_GREATER:              \
 172         case EXPR_BINARY_GREATEREQUAL:         \
 173         case EXPR_BINARY_BITWISE_AND:          \
 174         case EXPR_BINARY_BITWISE_OR:           \
 175         case EXPR_BINARY_BITWISE_XOR:          \
 176         case EXPR_BINARY_LOGICAL_AND:          \
 177         case EXPR_BINARY_LOGICAL_OR:           \
 178         case EXPR_BINARY_SHIFTLEFT:            \
 179         case EXPR_BINARY_SHIFTRIGHT:           \
 180         case EXPR_BINARY_ASSIGN:               \
 181         case EXPR_BINARY_MUL_ASSIGN:           \
 182         case EXPR_BINARY_DIV_ASSIGN:           \
 183         case EXPR_BINARY_MOD_ASSIGN:           \
 184         case EXPR_BINARY_ADD_ASSIGN:           \
 185         case EXPR_BINARY_SUB_ASSIGN:           \
 186         case EXPR_BINARY_SHIFTLEFT_ASSIGN:     \
 187         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:    \
 188         case EXPR_BINARY_BITWISE_AND_ASSIGN:   \
 189         case EXPR_BINARY_BITWISE_XOR_ASSIGN:   \
 190         case EXPR_BINARY_BITWISE_OR_ASSIGN:    \
 191         case EXPR_BINARY_COMMA:                \
 192         case EXPR_BINARY_ISGREATER:            \
 193         case EXPR_BINARY_ISGREATEREQUAL:       \
 194         case EXPR_BINARY_ISLESS:               \
 195         case EXPR_BINARY_ISLESSEQUAL:          \
 196         case EXPR_BINARY_ISLESSGREATER:        \
 197         case EXPR_BINARY_ISUNORDERED:
 198
 199 /**
 200  * unary expression with mandatory operand
 201  */
 202 #define EXPR_UNARY_CASES_MANDATORY         \
 203         case EXPR_UNARY_NEGATE:                \
 204         case EXPR_UNARY_PLUS:                  \
 205         case EXPR_UNARY_BITWISE_NEGATE:        \
 206         case EXPR_UNARY_NOT:                   \
 207         case EXPR_UNARY_DEREFERENCE:           \
 208         case EXPR_UNARY_TAKE_ADDRESS:          \
 209         case EXPR_UNARY_POSTFIX_INCREMENT:     \
 210         case EXPR_UNARY_POSTFIX_DECREMENT:     \
 211         case EXPR_UNARY_PREFIX_INCREMENT:      \
 212         case EXPR_UNARY_PREFIX_DECREMENT:      \
 213         case EXPR_UNARY_CAST:                  \
 214         case EXPR_UNARY_CAST_IMPLICIT:         \
 215         case EXPR_UNARY_ASSUME:                \
 216         case EXPR_UNARY_DELETE:                \
 217         case EXPR_UNARY_DELETE_ARRAY:
 218
 219 /**
 220  * unary expression with optinal operand
 221  */
 222 #define EXPR_UNARY_CASES_OPTIONAL \
 223         case EXPR_UNARY_THROW:        \
 224
 225 #define EXPR_UNARY_CASES       \
 226         EXPR_UNARY_CASES_MANDATORY \
 227         EXPR_UNARY_CASES_OPTIONAL
 228
 229 struct expression_base_t {
 230         expression_kind_t   kind;
 231         type_t             *type;
 232         source_position_t   source_position;
 233 #ifndef NDEBUG
 234         bool                transformed;
 235 #endif
 236 };
 237
 238 struct const_expression_t {
 239         expression_base_t  base;
 240         union {
 241                 long long      int_value;
 242                 long double    float_value;
 243                 string_t       character;
 244                 wide_string_t  wide_character;
 245         } v;
 246         bool               is_ms_noop;  /**< True, if this constant is the result
 247                                              of an microsoft __noop operator */
 248 };
 249
 250 struct string_literal_expression_t {
 251         expression_base_t  base;
 252         string_t           value;
 253 };
 254
 255 struct funcname_expression_t {
 256         expression_base_t  base;
 257         funcname_kind_t    kind;
 258         string_t           value;     /**< the value once assigned. */
 259 };
 260
 261 struct wide_string_literal_expression_t {
 262         expression_base_t  base;
 263         wide_string_t      value;
 264 };
 265
 266 struct compound_literal_expression_t {
 267         expression_base_t  base;
 268         type_t            *type;
 269         initializer_t     *initializer;
 270 };
 271
 272 struct builtin_symbol_expression_t {
 273         expression_base_t  base;
 274         symbol_t          *symbol;
 275 };
 276
 277 struct builtin_constant_expression_t {
 278         expression_base_t  base;
 279         expression_t      *value;
 280 };
 281
 282 struct builtin_prefetch_expression_t {
 283         expression_base_t  base;
 284         expression_t      *adr;
 285         expression_t      *rw;
 286         expression_t      *locality;
 287 };
 288
 289 struct reference_expression_t {
 290         expression_base_t  base;
 291         entity_t          *entity;
 292 };
 293
 294 struct call_argument_t {
 295         expression_t    *expression;
 296         call_argument_t *next;
 297 };
 298
 299 struct call_expression_t {
 300         expression_base_t  base;
 301         expression_t      *function;
 302         call_argument_t   *arguments;
 303 };
 304
 305 struct unary_expression_t {
 306         expression_base_t  base;
 307         expression_t      *value;
 308 };
 309
 310 struct binary_expression_t {
 311         expression_base_t  base;
 312         expression_t      *left;
 313         expression_t      *right;
 314 };
 315
 316 struct select_expression_t {
 317         expression_base_t  base;
 318         expression_t      *compound;
 319         entity_t          *compound_entry;
 320 };
 321
 322 struct array_access_expression_t {
 323         expression_base_t  base;
 324         expression_t      *array_ref;
 325         expression_t      *index;
 326         bool               flipped; /**< index/ref was written in a 5[a] way */
 327 };
 328
 329 struct typeprop_expression_t {
 330         expression_base_t  base;
 331         type_t            *type;
 332         expression_t      *tp_expression;
 333 };
 334
 335 struct designator_t {
 336         source_position_t  source_position;
 337         symbol_t          *symbol;
 338         expression_t      *array_index;
 339         designator_t      *next;
 340 };
 341
 342 struct offsetof_expression_t {
 343         expression_base_t  base;
 344         type_t            *type;
 345         designator_t      *designator;
 346 };
 347
 348 struct va_start_expression_t {
 349         expression_base_t  base;
 350         expression_t      *ap;
 351         variable_t        *parameter;
 352 };
 353
 354 struct va_arg_expression_t {
 355         expression_base_t  base;
 356         expression_t      *ap;
 357 };
 358
 359 struct conditional_expression_t {
 360         expression_base_t  base;
 361         expression_t      *condition;
 362         expression_t      *true_expression;
 363         expression_t      *false_expression;
 364 };
 365
 366 struct statement_expression_t {
 367         expression_base_t  base;
 368         statement_t       *statement;
 369 };
 370
 371 struct classify_type_expression_t {
 372         expression_base_t  base;
 373         expression_t      *type_expression;
 374 };
 375
 376 struct label_address_expression_t {
 377         expression_base_t  base;
 378         label_t           *label;
 379 };
 380
 381 union expression_t {
 382         expression_kind_t                kind;
 383         expression_base_t                base;
 384         const_expression_t               conste;
 385         funcname_expression_t            funcname;
 386         string_literal_expression_t      string;
 387         wide_string_literal_expression_t wide_string;
 388         compound_literal_expression_t    compound_literal;
 389         builtin_symbol_expression_t      builtin_symbol;
 390         builtin_constant_expression_t    builtin_constant;
 391         builtin_prefetch_expression_t    builtin_prefetch;
 392         reference_expression_t           reference;
 393         call_expression_t                call;
 394         unary_expression_t               unary;
 395         binary_expression_t              binary;
 396         select_expression_t              select;
 397         array_access_expression_t        array_access;
 398         typeprop_expression_t            typeprop;
 399         offsetof_expression_t            offsetofe;
 400         va_start_expression_t            va_starte;
 401         va_arg_expression_t              va_arge;
 402         conditional_expression_t         conditional;
 403         statement_expression_t           statement;
 404         classify_type_expression_t       classify_type;
 405         label_address_expression_t       label_address;
 406 };
 407
 408 typedef enum initializer_kind_t {
 409         INITIALIZER_VALUE,
 410         INITIALIZER_LIST,
 411         INITIALIZER_STRING,
 412         INITIALIZER_WIDE_STRING,
 413         INITIALIZER_DESIGNATOR
 414 } initializer_kind_t;
 415
 416 struct initializer_base_t {
 417         initializer_kind_t kind;
 418 };
 419
 420 struct initializer_value_t {
 421         initializer_base_t  base;
 422         expression_t       *value;
 423 };
 424
 425 struct initializer_list_t {
 426         initializer_base_t  base;
 427         size_t              len;
 428         initializer_t      *initializers[];
 429 };
 430
 431 struct initializer_string_t {
 432         initializer_base_t base;
 433         string_t           string;
 434 };
 435
 436 struct initializer_wide_string_t {
 437         initializer_base_t  base;
 438         wide_string_t       string;
 439 };
 440
 441 struct initializer_designator_t {
 442         initializer_base_t  base;
 443         designator_t       *designator;
 444 };
 445
 446 union initializer_t {
 447         initializer_kind_t        kind;
 448         initializer_base_t        base;
 449         initializer_value_t       value;
 450         initializer_list_t        list;
 451         initializer_string_t      string;
 452         initializer_wide_string_t wide_string;
 453         initializer_designator_t  designator;
 454 };
 455
 456 /**
 457  * GNU attributes.
 458  */
 459 typedef enum gnu_attribute_kind_t {
 460         GNU_AK_CONST,
 461         GNU_AK_VOLATILE,
 462         GNU_AK_CDECL,
 463         GNU_AK_STDCALL,
 464         GNU_AK_FASTCALL,
 465         GNU_AK_DEPRECATED,
 466         GNU_AK_NOINLINE,
 467         GNU_AK_NORETURN,
 468         GNU_AK_NAKED,
 469         GNU_AK_PURE,
 470         GNU_AK_ALWAYS_INLINE,
 471         GNU_AK_MALLOC,
 472         GNU_AK_WEAK,
 473         GNU_AK_CONSTRUCTOR,
 474         GNU_AK_DESTRUCTOR,
 475         GNU_AK_NOTHROW,
 476         GNU_AK_TRANSPARENT_UNION,
 477         GNU_AK_COMMON,
 478         GNU_AK_NOCOMMON,
 479         GNU_AK_PACKED,
 480         GNU_AK_SHARED,
 481         GNU_AK_NOTSHARED,
 482         GNU_AK_USED,
 483         GNU_AK_UNUSED,
 484         GNU_AK_NO_INSTRUMENT_FUNCTION,
 485         GNU_AK_WARN_UNUSED_RESULT,
 486         GNU_AK_LONGCALL,
 487         GNU_AK_SHORTCALL,
 488         GNU_AK_LONG_CALL,
 489         GNU_AK_SHORT_CALL,
 490         GNU_AK_FUNCTION_VECTOR,
 491         GNU_AK_INTERRUPT,
 492         GNU_AK_INTERRUPT_HANDLER,
 493         GNU_AK_NMI_HANDLER,
 494         GNU_AK_NESTING,
 495         GNU_AK_NEAR,
 496         GNU_AK_FAR,
 497         GNU_AK_SIGNAL,
 498         GNU_AK_EIGTHBIT_DATA,
 499         GNU_AK_TINY_DATA,
 500         GNU_AK_SAVEALL,
 501         GNU_AK_FLATTEN,
 502         GNU_AK_SSEREGPARM,
 503         GNU_AK_EXTERNALLY_VISIBLE,
 504         GNU_AK_RETURN_TWICE,
 505         GNU_AK_MAY_ALIAS,
 506         GNU_AK_MS_STRUCT,
 507         GNU_AK_GCC_STRUCT,
 508         GNU_AK_DLLIMPORT,
 509         GNU_AK_DLLEXPORT,
 510         GNU_AK_ALIGNED,
 511         GNU_AK_ALIAS,
 512         GNU_AK_SECTION,
 513         GNU_AK_FORMAT,
 514         GNU_AK_FORMAT_ARG,
 515         GNU_AK_WEAKREF,
 516         GNU_AK_NONNULL,
 517         GNU_AK_TLS_MODEL,
 518         GNU_AK_VISIBILITY,
 519         GNU_AK_REGPARM,
 520         GNU_AK_MODEL,
 521         GNU_AK_MODE,
 522         GNU_AK_TRAP_EXIT,
 523         GNU_AK_SP_SWITCH,
 524         GNU_AK_SENTINEL,
 525         GNU_AK_LAST
 526 } gnu_attribute_kind_t;
 527
 528 typedef enum statement_kind_t {
 529         STATEMENT_INVALID,
 530         STATEMENT_EMPTY,
 531         STATEMENT_COMPOUND,
 532         STATEMENT_RETURN,
 533         STATEMENT_DECLARATION,
 534         STATEMENT_LOCAL_LABEL,
 535         STATEMENT_IF,
 536         STATEMENT_SWITCH,
 537         STATEMENT_EXPRESSION,
 538         STATEMENT_CONTINUE,
 539         STATEMENT_BREAK,
 540         STATEMENT_GOTO,
 541         STATEMENT_LABEL,
 542         STATEMENT_CASE_LABEL,
 543         STATEMENT_WHILE,
 544         STATEMENT_DO_WHILE,
 545         STATEMENT_FOR,
 546         STATEMENT_ASM,
 547         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 548         STATEMENT_LEAVE            /**< MS __leave */
 549 } statement_kind_t;
 550
 551 struct statement_base_t {
 552         statement_kind_t   kind;
 553         statement_t       *next;
 554         source_position_t  source_position;
 555         statement_t       *parent;
 556         bool               reachable;
 557 #ifndef NDEBUG
 558         bool               transformed;
 559 #endif
 560 };
 561
 562 struct invalid_statement_t {
 563         statement_base_t  base;
 564 };
 565
 566 struct empty_statement_t {
 567         statement_base_t  base;
 568 };
 569
 570 struct return_statement_t {
 571         statement_base_t  base;
 572         expression_t     *value;
 573 };
 574
 575 struct compound_statement_t {
 576         statement_base_t  base;
 577         statement_t      *statements;
 578         scope_t           scope;
 579 };
 580
 581 struct declaration_statement_t {
 582         statement_base_t  base;
 583         entity_t         *declarations_begin;
 584         entity_t         *declarations_end;
 585 };
 586
 587 struct local_label_statement_t {
 588         statement_base_t  base;
 589         entity_t         *labels_begin;
 590         entity_t         *labels_end;
 591 };
 592
 593 struct if_statement_t {
 594         statement_base_t  base;
 595         expression_t     *condition;
 596         statement_t      *true_statement;
 597         statement_t      *false_statement;
 598 };
 599
 600 struct switch_statement_t {
 601         statement_base_t        base;
 602         expression_t           *expression;
 603         statement_t            *body;
 604         case_label_statement_t *first_case, *last_case;  /**< List of all cases, including default. */
 605         case_label_statement_t *default_label;           /**< The default label if existent. */
 606         unsigned long           default_proj_nr;         /**< The Proj-number for the default Proj. */
 607 };
 608
 609 struct goto_statement_t {
 610         statement_base_t  base;
 611         label_t          *label;         /**< The destination label. */
 612         expression_t     *expression;    /**< The expression for an assigned goto. */
 613         goto_statement_t *next;          /**< links all goto statements of a function */
 614 };
 615
 616 struct case_label_statement_t {
 617         statement_base_t        base;
 618         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 619         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 620         case_label_statement_t *next;          /**< link to the next case label in switch */
 621         statement_t            *statement;
 622         long                   first_case;     /**< The folded value of expression. */
 623         long                   last_case;      /**< The folded value of end_range. */
 624         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 625         bool                   is_empty_range; /**< If set marked this as an empty range. */
 626 };
 627
 628 struct label_statement_t {
 629         statement_base_t   base;
 630         label_t           *label;
 631         statement_t       *statement;
 632         label_statement_t *next;    /**< links all label statements of a function */
 633 };
 634
 635 struct expression_statement_t {
 636         statement_base_t  base;
 637         expression_t     *expression;
 638 };
 639
 640 struct while_statement_t {
 641         statement_base_t  base;
 642         expression_t     *condition;
 643         statement_t      *body;
 644 };
 645
 646 struct do_while_statement_t {
 647         statement_base_t  base;
 648         expression_t     *condition;
 649         statement_t      *body;
 650 };
 651
 652 struct for_statement_t {
 653         statement_base_t  base;
 654         expression_t     *initialisation;
 655         expression_t     *condition;
 656         expression_t     *step;
 657         statement_t      *body;
 658         scope_t           scope;
 659         bool              condition_reachable:1;
 660         bool              step_reachable:1;
 661 };
 662
 663 struct asm_argument_t {
 664         string_t        constraints;
 665         expression_t   *expression;
 666         symbol_t       *symbol;
 667         asm_argument_t *next;
 668 };
 669
 670 struct asm_clobber_t {
 671         string_t       clobber;
 672         asm_clobber_t *next;
 673 };
 674
 675 struct asm_statement_t {
 676         statement_base_t base;
 677         string_t         asm_text;
 678         asm_argument_t  *inputs;
 679         asm_argument_t  *outputs;
 680         asm_clobber_t   *clobbers;
 681         bool             is_volatile;
 682 };
 683
 684 struct ms_try_statement_t {
 685         statement_base_t  base;
 686         statement_t      *try_statement;
 687         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 688         statement_t      *final_statement;
 689 };
 690
 691 struct leave_statement_t {
 692         statement_base_t  base;
 693 };
 694
 695 union statement_t {
 696         statement_kind_t         kind;
 697         statement_base_t         base;
 698         return_statement_t       returns;
 699         compound_statement_t     compound;
 700         declaration_statement_t  declaration;
 701         local_label_statement_t  local_label;
 702         if_statement_t           ifs;
 703         switch_statement_t       switchs;
 704         goto_statement_t         gotos;
 705         case_label_statement_t   case_label;
 706         label_statement_t        label;
 707         expression_statement_t   expression;
 708         while_statement_t        whiles;
 709         do_while_statement_t     do_while;
 710         for_statement_t          fors;
 711         asm_statement_t          asms;
 712         ms_try_statement_t       ms_try;
 713         leave_statement_t        leave;
 714 };
 715
 716 struct translation_unit_t {
 717         scope_t      scope;
 718         statement_t *global_asm;
 719 };
 720
 721 static inline
 722 void *_allocate_ast(size_t size)
 723 {
 724         return obstack_alloc(&ast_obstack, size);
 725 }
 726
 727 static inline
 728 bool is_invalid_expression(expression_t *expression)
 729 {
 730         return expression->base.kind == EXPR_INVALID;
 731 }
 732
 733 static inline
 734 bool is_invalid_statement(statement_t *statement)
 735 {
 736         return statement->base.kind == STATEMENT_INVALID;
 737 }
 738
 739
 740 #define allocate_ast(size)                 _allocate_ast(size)
 741
 742 #endif