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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_CONSTANT_P,
  85         EXPR_BUILTIN_TYPES_COMPATIBLE_P,
  86         EXPR_OFFSETOF,
  87         EXPR_VA_START,
  88         EXPR_VA_ARG,
  89         EXPR_STATEMENT,
  90         EXPR_LABEL_ADDRESS, /**< GCC extension &&label operator */
  91
  92         EXPR_UNARY_FIRST,
  93         EXPR_UNARY_NEGATE = EXPR_UNARY_FIRST,
  94         EXPR_UNARY_PLUS,
  95         EXPR_UNARY_BITWISE_NEGATE,
  96         EXPR_UNARY_NOT,
  97         EXPR_UNARY_DEREFERENCE,
  98         EXPR_UNARY_TAKE_ADDRESS,
  99         EXPR_UNARY_POSTFIX_INCREMENT,
 100         EXPR_UNARY_POSTFIX_DECREMENT,
 101         EXPR_UNARY_PREFIX_INCREMENT,
 102         EXPR_UNARY_PREFIX_DECREMENT,
 103         EXPR_UNARY_CAST,
 104         EXPR_UNARY_CAST_IMPLICIT, /**< compiler generated cast */
 105         EXPR_UNARY_ASSUME,        /**< MS __assume() */
 106         EXPR_UNARY_DELETE,
 107         EXPR_UNARY_DELETE_ARRAY,
 108         EXPR_UNARY_THROW,
 109         EXPR_UNARY_LAST = EXPR_UNARY_THROW,
 110
 111         EXPR_BINARY_FIRST,
 112         EXPR_BINARY_ADD = EXPR_BINARY_FIRST,
 113         EXPR_BINARY_SUB,
 114         EXPR_BINARY_MUL,
 115         EXPR_BINARY_DIV,
 116         EXPR_BINARY_MOD,
 117         EXPR_BINARY_EQUAL,
 118         EXPR_BINARY_NOTEQUAL,
 119         EXPR_BINARY_LESS,
 120         EXPR_BINARY_LESSEQUAL,
 121         EXPR_BINARY_GREATER,
 122         EXPR_BINARY_GREATEREQUAL,
 123         EXPR_BINARY_BITWISE_AND,
 124         EXPR_BINARY_BITWISE_OR,
 125         EXPR_BINARY_BITWISE_XOR,
 126         EXPR_BINARY_LOGICAL_AND,
 127         EXPR_BINARY_LOGICAL_OR,
 128         EXPR_BINARY_SHIFTLEFT,
 129         EXPR_BINARY_SHIFTRIGHT,
 130         EXPR_BINARY_ASSIGN,
 131         EXPR_BINARY_MUL_ASSIGN,
 132         EXPR_BINARY_DIV_ASSIGN,
 133         EXPR_BINARY_MOD_ASSIGN,
 134         EXPR_BINARY_ADD_ASSIGN,
 135         EXPR_BINARY_SUB_ASSIGN,
 136         EXPR_BINARY_SHIFTLEFT_ASSIGN,
 137         EXPR_BINARY_SHIFTRIGHT_ASSIGN,
 138         EXPR_BINARY_BITWISE_AND_ASSIGN,
 139         EXPR_BINARY_BITWISE_XOR_ASSIGN,
 140         EXPR_BINARY_BITWISE_OR_ASSIGN,
 141         EXPR_BINARY_COMMA,
 142
 143         EXPR_BINARY_ISGREATER,
 144         EXPR_BINARY_ISGREATEREQUAL,
 145         EXPR_BINARY_ISLESS,
 146         EXPR_BINARY_ISLESSEQUAL,
 147         EXPR_BINARY_ISLESSGREATER,
 148         EXPR_BINARY_ISUNORDERED,
 149         EXPR_BINARY_LAST = EXPR_BINARY_ISUNORDERED,
 150 } expression_kind_t;
 151
 152 typedef enum funcname_kind_t {
 153         FUNCNAME_FUNCTION,           /**< C99 __func__, older __FUNCTION__ */
 154         FUNCNAME_PRETTY_FUNCTION,    /**< GNUC __PRETTY_FUNCTION__ */
 155         FUNCNAME_FUNCSIG,            /**< MS __FUNCSIG__ */
 156         FUNCNAME_FUNCDNAME           /**< MS __FUNCDNAME__ */
 157 } funcname_kind_t;
 158
 159 /* convenience macros */
 160 #define EXPR_BINARY_CASES                  \
 161         case EXPR_BINARY_ADD:                  \
 162         case EXPR_BINARY_SUB:                  \
 163         case EXPR_BINARY_MUL:                  \
 164         case EXPR_BINARY_DIV:                  \
 165         case EXPR_BINARY_MOD:                  \
 166         case EXPR_BINARY_EQUAL:                \
 167         case EXPR_BINARY_NOTEQUAL:             \
 168         case EXPR_BINARY_LESS:                 \
 169         case EXPR_BINARY_LESSEQUAL:            \
 170         case EXPR_BINARY_GREATER:              \
 171         case EXPR_BINARY_GREATEREQUAL:         \
 172         case EXPR_BINARY_BITWISE_AND:          \
 173         case EXPR_BINARY_BITWISE_OR:           \
 174         case EXPR_BINARY_BITWISE_XOR:          \
 175         case EXPR_BINARY_LOGICAL_AND:          \
 176         case EXPR_BINARY_LOGICAL_OR:           \
 177         case EXPR_BINARY_SHIFTLEFT:            \
 178         case EXPR_BINARY_SHIFTRIGHT:           \
 179         case EXPR_BINARY_ASSIGN:               \
 180         case EXPR_BINARY_MUL_ASSIGN:           \
 181         case EXPR_BINARY_DIV_ASSIGN:           \
 182         case EXPR_BINARY_MOD_ASSIGN:           \
 183         case EXPR_BINARY_ADD_ASSIGN:           \
 184         case EXPR_BINARY_SUB_ASSIGN:           \
 185         case EXPR_BINARY_SHIFTLEFT_ASSIGN:     \
 186         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:    \
 187         case EXPR_BINARY_BITWISE_AND_ASSIGN:   \
 188         case EXPR_BINARY_BITWISE_XOR_ASSIGN:   \
 189         case EXPR_BINARY_BITWISE_OR_ASSIGN:    \
 190         case EXPR_BINARY_COMMA:                \
 191         case EXPR_BINARY_ISGREATER:            \
 192         case EXPR_BINARY_ISGREATEREQUAL:       \
 193         case EXPR_BINARY_ISLESS:               \
 194         case EXPR_BINARY_ISLESSEQUAL:          \
 195         case EXPR_BINARY_ISLESSGREATER:        \
 196         case EXPR_BINARY_ISUNORDERED:
 197
 198 /**
 199  * unary expression with mandatory operand
 200  */
 201 #define EXPR_UNARY_CASES_MANDATORY         \
 202         case EXPR_UNARY_NEGATE:                \
 203         case EXPR_UNARY_PLUS:                  \
 204         case EXPR_UNARY_BITWISE_NEGATE:        \
 205         case EXPR_UNARY_NOT:                   \
 206         case EXPR_UNARY_DEREFERENCE:           \
 207         case EXPR_UNARY_TAKE_ADDRESS:          \
 208         case EXPR_UNARY_POSTFIX_INCREMENT:     \
 209         case EXPR_UNARY_POSTFIX_DECREMENT:     \
 210         case EXPR_UNARY_PREFIX_INCREMENT:      \
 211         case EXPR_UNARY_PREFIX_DECREMENT:      \
 212         case EXPR_UNARY_CAST:                  \
 213         case EXPR_UNARY_CAST_IMPLICIT:         \
 214         case EXPR_UNARY_ASSUME:                \
 215         case EXPR_UNARY_DELETE:                \
 216         case EXPR_UNARY_DELETE_ARRAY:
 217
 218 /**
 219  * unary expression with optional operand
 220  */
 221 #define EXPR_UNARY_CASES_OPTIONAL \
 222         case EXPR_UNARY_THROW:        \
 223
 224 #define EXPR_UNARY_CASES       \
 225         EXPR_UNARY_CASES_MANDATORY \
 226         EXPR_UNARY_CASES_OPTIONAL
 227
 228 /**
 229  * The base class of every expression.
 230  */
 231 struct expression_base_t {
 232         expression_kind_t   kind;            /**< The expression kind. */
 233         type_t             *type;            /**< The type of the expression. */
 234         source_position_t   source_position; /**< The source position of this expression. */
 235         bool                parenthesized;
 236 #ifndef NDEBUG
 237         bool                transformed;     /**< Set if this expression was transformed. */
 238 #endif
 239 };
 240
 241 /**
 242  * A constant.
 243  */
 244 struct const_expression_t {
 245         expression_base_t  base;
 246         union {
 247                 long long      int_value;
 248                 long double    float_value;
 249                 string_t       character;
 250                 wide_string_t  wide_character;
 251         } v;
 252         bool               is_ms_noop;  /**< True, if this constant is the result
 253                                              of an microsoft __noop operator */
 254 };
 255
 256 struct string_literal_expression_t {
 257         expression_base_t  base;
 258         string_t           value;
 259 };
 260
 261 struct funcname_expression_t {
 262         expression_base_t  base;
 263         funcname_kind_t    kind;
 264         string_t           value;     /**< the value once assigned. */
 265 };
 266
 267 struct wide_string_literal_expression_t {
 268         expression_base_t  base;
 269         wide_string_t      value;
 270 };
 271
 272 struct compound_literal_expression_t {
 273         expression_base_t  base;
 274         type_t            *type;
 275         initializer_t     *initializer;
 276 };
 277
 278 struct builtin_constant_expression_t {
 279         expression_base_t  base;
 280         expression_t      *value;
 281 };
 282
 283 struct builtin_types_compatible_expression_t {
 284         expression_base_t  base;
 285         type_t            *left;
 286         type_t            *right;
 287 };
 288
 289 struct reference_expression_t {
 290         expression_base_t  base;
 291         entity_t          *entity;
 292 };
 293
 294 /**
 295  * An argument of a call.
 296  */
 297 struct call_argument_t {
 298         expression_t    *expression;  /**< The expression which value is transmitted. */
 299         call_argument_t *next;        /**< Links to the next argument of this call. */
 300 };
 301
 302
 303 struct call_expression_t {
 304         expression_base_t  base;
 305         expression_t      *function;  /**< The address of the function to call. */
 306         call_argument_t   *arguments; /**< List of arguments of this call. */
 307 };
 308
 309
 310 struct unary_expression_t {
 311         expression_base_t  base;
 312         expression_t      *value;     /**< The unary operand. */
 313 };
 314
 315 struct binary_expression_t {
 316         expression_base_t  base;
 317         expression_t      *left;
 318         expression_t      *right;
 319 };
 320
 321 struct select_expression_t {
 322         expression_base_t  base;
 323         expression_t      *compound;
 324         entity_t          *compound_entry;
 325 };
 326
 327 struct array_access_expression_t {
 328         expression_base_t  base;
 329         expression_t      *array_ref; /**< the referenced array */
 330         expression_t      *index;     /**< the index used */
 331         bool               flipped;   /**< True if index/ref was written in a 5[a] way */
 332 };
 333
 334 struct typeprop_expression_t {
 335         expression_base_t  base;
 336         type_t            *type;
 337         expression_t      *tp_expression;
 338 };
 339
 340 struct designator_t {
 341         source_position_t  source_position;
 342         symbol_t          *symbol;      /**< the symbol if any */
 343         expression_t      *array_index; /**< the array index if any */
 344         designator_t      *next;
 345 };
 346
 347 struct offsetof_expression_t {
 348         expression_base_t  base;
 349         type_t            *type;
 350         designator_t      *designator;
 351 };
 352
 353 struct va_start_expression_t {
 354         expression_base_t  base;
 355         expression_t      *ap;
 356         variable_t        *parameter;
 357 };
 358
 359 struct va_arg_expression_t {
 360         expression_base_t  base;
 361         expression_t      *ap;
 362 };
 363
 364 struct conditional_expression_t {
 365         expression_base_t  base;
 366         expression_t      *condition;
 367         expression_t      *true_expression;
 368         expression_t      *false_expression;
 369 };
 370
 371 struct statement_expression_t {
 372         expression_base_t  base;
 373         statement_t       *statement;
 374 };
 375
 376 struct classify_type_expression_t {
 377         expression_base_t  base;
 378         expression_t      *type_expression;
 379 };
 380
 381 struct label_address_expression_t {
 382         expression_base_t  base;
 383         label_t           *label;
 384 };
 385
 386 union expression_t {
 387         expression_kind_t                     kind;
 388         expression_base_t                     base;
 389         const_expression_t                    conste;
 390         funcname_expression_t                 funcname;
 391         string_literal_expression_t           string;
 392         wide_string_literal_expression_t      wide_string;
 393         compound_literal_expression_t         compound_literal;
 394         builtin_constant_expression_t         builtin_constant;
 395         builtin_types_compatible_expression_t builtin_types_compatible;
 396         reference_expression_t                reference;
 397         call_expression_t                     call;
 398         unary_expression_t                    unary;
 399         binary_expression_t                   binary;
 400         select_expression_t                   select;
 401         array_access_expression_t             array_access;
 402         typeprop_expression_t                 typeprop;
 403         offsetof_expression_t                 offsetofe;
 404         va_start_expression_t                 va_starte;
 405         va_arg_expression_t                   va_arge;
 406         conditional_expression_t              conditional;
 407         statement_expression_t                statement;
 408         classify_type_expression_t            classify_type;
 409         label_address_expression_t            label_address;
 410 };
 411
 412 typedef enum initializer_kind_t {
 413         INITIALIZER_VALUE,
 414         INITIALIZER_LIST,
 415         INITIALIZER_STRING,
 416         INITIALIZER_WIDE_STRING,
 417         INITIALIZER_DESIGNATOR
 418 } initializer_kind_t;
 419
 420 struct initializer_base_t {
 421         initializer_kind_t kind;
 422 };
 423
 424 struct initializer_value_t {
 425         initializer_base_t  base;
 426         expression_t       *value;
 427 };
 428
 429 struct initializer_list_t {
 430         initializer_base_t  base;
 431         size_t              len;
 432         initializer_t      *initializers[];
 433 };
 434
 435 struct initializer_string_t {
 436         initializer_base_t base;
 437         string_t           string;
 438 };
 439
 440 struct initializer_wide_string_t {
 441         initializer_base_t  base;
 442         wide_string_t       string;
 443 };
 444
 445 struct initializer_designator_t {
 446         initializer_base_t  base;
 447         designator_t       *designator;
 448 };
 449
 450 union initializer_t {
 451         initializer_kind_t        kind;
 452         initializer_base_t        base;
 453         initializer_value_t       value;
 454         initializer_list_t        list;
 455         initializer_string_t      string;
 456         initializer_wide_string_t wide_string;
 457         initializer_designator_t  designator;
 458 };
 459
 460 /**
 461  * GNU attributes.
 462  */
 463 typedef enum gnu_attribute_kind_t {
 464         GNU_AK_CONST,
 465         GNU_AK_VOLATILE,
 466         GNU_AK_CDECL,
 467         GNU_AK_STDCALL,
 468         GNU_AK_FASTCALL,
 469         GNU_AK_DEPRECATED,
 470         GNU_AK_NOINLINE,
 471         GNU_AK_RETURNS_TWICE,
 472         GNU_AK_NORETURN,
 473         GNU_AK_NAKED,
 474         GNU_AK_PURE,
 475         GNU_AK_ALWAYS_INLINE,
 476         GNU_AK_MALLOC,
 477         GNU_AK_WEAK,
 478         GNU_AK_CONSTRUCTOR,
 479         GNU_AK_DESTRUCTOR,
 480         GNU_AK_NOTHROW,
 481         GNU_AK_TRANSPARENT_UNION,
 482         GNU_AK_COMMON,
 483         GNU_AK_NOCOMMON,
 484         GNU_AK_PACKED,
 485         GNU_AK_SHARED,
 486         GNU_AK_NOTSHARED,
 487         GNU_AK_USED,
 488         GNU_AK_UNUSED,
 489         GNU_AK_NO_INSTRUMENT_FUNCTION,
 490         GNU_AK_WARN_UNUSED_RESULT,
 491         GNU_AK_LONGCALL,
 492         GNU_AK_SHORTCALL,
 493         GNU_AK_LONG_CALL,
 494         GNU_AK_SHORT_CALL,
 495         GNU_AK_FUNCTION_VECTOR,
 496         GNU_AK_INTERRUPT,
 497         GNU_AK_INTERRUPT_HANDLER,
 498         GNU_AK_NMI_HANDLER,
 499         GNU_AK_NESTING,
 500         GNU_AK_NEAR,
 501         GNU_AK_FAR,
 502         GNU_AK_SIGNAL,
 503         GNU_AK_EIGTHBIT_DATA,
 504         GNU_AK_TINY_DATA,
 505         GNU_AK_SAVEALL,
 506         GNU_AK_FLATTEN,
 507         GNU_AK_SSEREGPARM,
 508         GNU_AK_EXTERNALLY_VISIBLE,
 509         GNU_AK_RETURN_TWICE,
 510         GNU_AK_MAY_ALIAS,
 511         GNU_AK_MS_STRUCT,
 512         GNU_AK_GCC_STRUCT,
 513         GNU_AK_DLLIMPORT,
 514         GNU_AK_DLLEXPORT,
 515         GNU_AK_ALIGNED,
 516         GNU_AK_ALIAS,
 517         GNU_AK_SECTION,
 518         GNU_AK_FORMAT,
 519         GNU_AK_FORMAT_ARG,
 520         GNU_AK_WEAKREF,
 521         GNU_AK_NONNULL,
 522         GNU_AK_TLS_MODEL,
 523         GNU_AK_VISIBILITY,
 524         GNU_AK_REGPARM,
 525         GNU_AK_MODEL,
 526         GNU_AK_MODE,
 527         GNU_AK_TRAP_EXIT,
 528         GNU_AK_SP_SWITCH,
 529         GNU_AK_SENTINEL,
 530         GNU_AK_LAST
 531 } gnu_attribute_kind_t;
 532
 533 /**
 534  * The statement kinds.
 535  */
 536 typedef enum statement_kind_t {
 537         STATEMENT_INVALID,
 538         STATEMENT_EMPTY,
 539         STATEMENT_COMPOUND,
 540         STATEMENT_RETURN,
 541         STATEMENT_DECLARATION,
 542         STATEMENT_IF,
 543         STATEMENT_SWITCH,
 544         STATEMENT_EXPRESSION,
 545         STATEMENT_CONTINUE,
 546         STATEMENT_BREAK,
 547         STATEMENT_GOTO,
 548         STATEMENT_LABEL,
 549         STATEMENT_CASE_LABEL,
 550         STATEMENT_WHILE,
 551         STATEMENT_DO_WHILE,
 552         STATEMENT_FOR,
 553         STATEMENT_ASM,
 554         STATEMENT_MS_TRY,          /**< MS __try/__finally or __try/__except */
 555         STATEMENT_LEAVE            /**< MS __leave */
 556 } statement_kind_t;
 557
 558 /**
 559  * The base class of every statement.
 560  */
 561 struct statement_base_t {
 562         statement_kind_t   kind;
 563         statement_t       *next;         /**< Point to the next statement in a compound statement. */
 564         source_position_t  source_position;
 565         statement_t       *parent;       /**< The Parent statement that controls the execution. */
 566         bool               reachable;    /**< True, if this statement is reachable. */
 567 #ifndef NDEBUG
 568         bool               transformed;
 569 #endif
 570 };
 571
 572 struct invalid_statement_t {
 573         statement_base_t  base;
 574 };
 575
 576 struct empty_statement_t {
 577         statement_base_t  base;
 578 };
 579
 580 struct return_statement_t {
 581         statement_base_t  base;
 582         expression_t     *value;    /**< The return value if any. */
 583 };
 584
 585 struct compound_statement_t {
 586         statement_base_t  base;
 587         statement_t      *statements;
 588         scope_t           scope;
 589         bool              stmt_expr; /**< True if this compound statement is a statement expression. */
 590 };
 591
 592 struct declaration_statement_t {
 593         statement_base_t  base;
 594         entity_t         *declarations_begin;
 595         entity_t         *declarations_end;
 596 };
 597
 598 struct if_statement_t {
 599         statement_base_t  base;
 600         expression_t     *condition;
 601         statement_t      *true_statement;
 602         statement_t      *false_statement;
 603 };
 604
 605 struct switch_statement_t {
 606         statement_base_t        base;
 607         expression_t           *expression;
 608         statement_t            *body;
 609         case_label_statement_t *first_case, *last_case;  /**< List of all cases, including default. */
 610         case_label_statement_t *default_label;           /**< The default label if existent. */
 611         unsigned long           default_proj_nr;         /**< The Proj-number for the default Proj. */
 612 };
 613
 614 struct goto_statement_t {
 615         statement_base_t  base;
 616         label_t          *label;         /**< The destination label. */
 617         expression_t     *expression;    /**< The expression for an assigned goto. */
 618         goto_statement_t *next;          /**< links all goto statements of a function */
 619 };
 620
 621 struct case_label_statement_t {
 622         statement_base_t        base;
 623         expression_t           *expression;    /**< The case label expression, NULL for default label. */
 624         expression_t           *end_range;     /**< For GNUC case a .. b: the end range expression, NULL else. */
 625         case_label_statement_t *next;          /**< link to the next case label in switch */
 626         statement_t            *statement;
 627         long                   first_case;     /**< The folded value of expression. */
 628         long                   last_case;      /**< The folded value of end_range. */
 629         bool                   is_bad;         /**< If set marked as bad to suppress warnings. */
 630         bool                   is_empty_range; /**< If set marked this as an empty range. */
 631 };
 632
 633 struct label_statement_t {
 634         statement_base_t   base;
 635         label_t           *label;
 636         statement_t       *statement;
 637         label_statement_t *next;    /**< links all label statements of a function */
 638 };
 639
 640 struct expression_statement_t {
 641         statement_base_t  base;
 642         expression_t     *expression;
 643 };
 644
 645 struct while_statement_t {
 646         statement_base_t  base;
 647         expression_t     *condition;
 648         statement_t      *body;
 649 };
 650
 651 struct do_while_statement_t {
 652         statement_base_t  base;
 653         expression_t     *condition;
 654         statement_t      *body;
 655 };
 656
 657 struct for_statement_t {
 658         statement_base_t  base;
 659         expression_t     *initialisation;
 660         expression_t     *condition;
 661         expression_t     *step;
 662         statement_t      *body;
 663         scope_t           scope;
 664         bool              condition_reachable:1;
 665         bool              step_reachable:1;
 666 };
 667
 668 struct asm_argument_t {
 669         string_t        constraints;
 670         expression_t   *expression;
 671         symbol_t       *symbol;
 672         asm_argument_t *next;
 673 };
 674
 675 struct asm_clobber_t {
 676         string_t       clobber;
 677         asm_clobber_t *next;
 678 };
 679
 680 struct asm_statement_t {
 681         statement_base_t base;
 682         string_t         asm_text;
 683         asm_argument_t  *inputs;
 684         asm_argument_t  *outputs;
 685         asm_clobber_t   *clobbers;
 686         bool             is_volatile;
 687 };
 688
 689 struct ms_try_statement_t {
 690         statement_base_t  base;
 691         statement_t      *try_statement;
 692         expression_t     *except_expression; /**< non-null for except, NULL for finally */
 693         statement_t      *final_statement;
 694 };
 695
 696 struct leave_statement_t {
 697         statement_base_t  base;
 698 };
 699
 700 union statement_t {
 701         statement_kind_t         kind;
 702         statement_base_t         base;
 703         return_statement_t       returns;
 704         compound_statement_t     compound;
 705         declaration_statement_t  declaration;
 706         if_statement_t           ifs;
 707         switch_statement_t       switchs;
 708         goto_statement_t         gotos;
 709         case_label_statement_t   case_label;
 710         label_statement_t        label;
 711         expression_statement_t   expression;
 712         while_statement_t        whiles;
 713         do_while_statement_t     do_while;
 714         for_statement_t          fors;
 715         asm_statement_t          asms;
 716         ms_try_statement_t       ms_try;
 717         leave_statement_t        leave;
 718 };
 719
 720 struct translation_unit_t {
 721         scope_t      scope;
 722         statement_t *global_asm;
 723 };
 724
 725 static inline
 726 void *_allocate_ast(size_t size)
 727 {
 728         return obstack_alloc(&ast_obstack, size);
 729 }
 730
 731 static inline
 732 bool is_invalid_expression(expression_t *expression)
 733 {
 734         return expression->base.kind == EXPR_INVALID;
 735 }
 736
 737 static inline
 738 bool is_invalid_statement(statement_t *statement)
 739 {
 740         return statement->base.kind == STATEMENT_INVALID;
 741 }
 742
 743
 744 #define allocate_ast(size)                 _allocate_ast(size)
 745
 746 #endif