gcc/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_C_COMMON_H
  23 #define GCC_C_COMMON_H
  24
  25 #include "splay-tree.h"
  26 #include "cpplib.h"
  27
  28 /* Usage of TREE_LANG_FLAG_?:
  29    0: COMPOUND_STMT_NO_SCOPE (in COMPOUND_STMT).
  30       TREE_NEGATED_INT (in INTEGER_CST).
  31       IDENTIFIER_MARKED (used by search routines).
  32       SCOPE_BEGIN_P (in SCOPE_STMT)
  33       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  34       NEW_FOR_SCOPE_P (in FOR_STMT)
  35       ASM_INPUT_P (in ASM_STMT)
  36       STMT_EXPR_NO_SCOPE (in STMT_EXPR)
  37    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  38       STMT_IS_FULL_EXPR_P (in _STMT)
  39    2: STMT_LINENO_FOR_FN_P (in _STMT)
  40    3: SCOPE_NO_CLEANUPS_P (in SCOPE_STMT)
  41       COMPOUND_STMT_BODY_BLOCK (in COMPOUND_STMT)
  42    4: SCOPE_PARTIAL_P (in SCOPE_STMT)
  43 */
  44
  45 /* Reserved identifiers.  This is the union of all the keywords for C,
  46    C++, and Objective-C.  All the type modifiers have to be in one
  47    block at the beginning, because they are used as mask bits.  There
  48    are 27 type modifiers; if we add many more we will have to redesign
  49    the mask mechanism.  */
  50
  51 enum rid
  52 {
  53   /* Modifiers: */
  54   /* C, in empirical order of frequency.  */
  55   RID_STATIC = 0,
  56   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  57   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  58   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  59
  60   /* C extensions */
  61   RID_BOUNDED, RID_UNBOUNDED, RID_COMPLEX, RID_THREAD,
  62
  63   /* C++ */
  64   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  65
  66   /* ObjC */
  67   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  68
  69   /* C */
  70   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  71   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  72   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  73   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  74   RID_SIZEOF,
  75
  76   /* C extensions */
  77   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  78   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
  79   RID_PTREXTENT, RID_PTRVALUE, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
  80
  81   /* Too many ways of getting the name of a function as a string */
  82   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  83
  84   /* C++ */
  85   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  86   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  87   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  88   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  89   RID_NEW,      RID_OPERATOR, RID_THIS,
  90   RID_THROW,    RID_TRUE,     RID_TRY,
  91   RID_TYPENAME, RID_TYPEID,   RID_USING,
  92
  93   /* casts */
  94   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  95
  96   /* Objective-C */
  97   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
  98   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  99   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 100   RID_AT_PROTOCOL, RID_AT_SELECTOR,  RID_AT_INTERFACE,
 101   RID_AT_IMPLEMENTATION,
 102
 103   RID_MAX,
 104
 105   RID_FIRST_MODIFIER = RID_STATIC,
 106   RID_LAST_MODIFIER = RID_ONEWAY,
 107
 108   RID_FIRST_AT = RID_AT_ENCODE,
 109   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 110   RID_FIRST_PQ = RID_IN,
 111   RID_LAST_PQ = RID_ONEWAY
 112 };
 113
 114 #define OBJC_IS_AT_KEYWORD(rid) \
 115   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 116    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 117
 118 #define OBJC_IS_PQ_KEYWORD(rid) \
 119   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 120    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 121
 122 /* The elements of `ridpointers' are identifier nodes for the reserved
 123    type names and storage classes.  It is indexed by a RID_... value.  */
 124 extern GTY ((length ("(int)RID_MAX"))) tree *ridpointers;
 125
 126 /* Standard named or nameless data types of the C compiler.  */
 127
 128 enum c_tree_index
 129 {
 130     CTI_WCHAR_TYPE,
 131     CTI_SIGNED_WCHAR_TYPE,
 132     CTI_UNSIGNED_WCHAR_TYPE,
 133     CTI_WINT_TYPE,
 134     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 135     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 136     CTI_INTMAX_TYPE,
 137     CTI_UINTMAX_TYPE,
 138     CTI_WIDEST_INT_LIT_TYPE,
 139     CTI_WIDEST_UINT_LIT_TYPE,
 140
 141     CTI_CHAR_ARRAY_TYPE,
 142     CTI_WCHAR_ARRAY_TYPE,
 143     CTI_INT_ARRAY_TYPE,
 144     CTI_STRING_TYPE,
 145     CTI_CONST_STRING_TYPE,
 146
 147     /* Type for boolean expressions (bool in C++, int in C).  */
 148     CTI_BOOLEAN_TYPE,
 149     CTI_BOOLEAN_TRUE,
 150     CTI_BOOLEAN_FALSE,
 151     /* C99's _Bool type.  */
 152     CTI_C_BOOL_TYPE,
 153     CTI_C_BOOL_TRUE,
 154     CTI_C_BOOL_FALSE,
 155     CTI_DEFAULT_FUNCTION_TYPE,
 156
 157     CTI_G77_INTEGER_TYPE,
 158     CTI_G77_UINTEGER_TYPE,
 159     CTI_G77_LONGINT_TYPE,
 160     CTI_G77_ULONGINT_TYPE,
 161
 162     /* These are not types, but we have to look them up all the time.  */
 163     CTI_FUNCTION_NAME_DECL,
 164     CTI_PRETTY_FUNCTION_NAME_DECL,
 165     CTI_C99_FUNCTION_NAME_DECL,
 166     CTI_SAVED_FUNCTION_NAME_DECLS,
 167
 168     CTI_VOID_ZERO,
 169
 170     CTI_MAX
 171 };
 172
 173 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 174
 175 /* Identifier part common to the C front ends.  Inherits from
 176    tree_identifier, despite appearances.  */
 177 struct c_common_identifier GTY(())
 178 {
 179   struct tree_common common;
 180   struct cpp_hashnode node;
 181 };
 182
 183 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 184 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 185 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 186 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 187 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 188 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 189 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 190 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 191 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 192 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 193
 194 #define boolean_type_node               c_global_trees[CTI_BOOLEAN_TYPE]
 195 #define boolean_true_node               c_global_trees[CTI_BOOLEAN_TRUE]
 196 #define boolean_false_node              c_global_trees[CTI_BOOLEAN_FALSE]
 197
 198 #define c_bool_type_node                c_global_trees[CTI_C_BOOL_TYPE]
 199 #define c_bool_true_node                c_global_trees[CTI_C_BOOL_TRUE]
 200 #define c_bool_false_node               c_global_trees[CTI_C_BOOL_FALSE]
 201
 202 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 203 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 204 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 205 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 206 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 207
 208 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 209
 210 /* g77 integer types, which which must be kept in sync with f/com.h */
 211 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 212 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 213 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 214 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 215
 216 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 217 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 218 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 219 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 220
 221 /* A node for `((void) 0)'.  */
 222 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 223
 224 extern GTY(()) tree c_global_trees[CTI_MAX];
 225
 226 /* Mark which labels are explicitly declared.
 227    These may be shadowed, and may be referenced from nested functions.  */
 228 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 229
 230 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 231    warning if they undergo concatenation.  */
 232 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 233
 234 typedef enum c_language_kind
 235 {
 236   clk_c = 0,      /* A dialect of C: K&R C, ANSI/ISO C89, C2000, etc.  */
 237   clk_cplusplus   /* ANSI/ISO C++ */
 238 }
 239 c_language_kind;
 240
 241 /* Information about a statement tree.  */
 242
 243 struct stmt_tree_s GTY(()) {
 244   /* The last statement added to the tree.  */
 245   tree x_last_stmt;
 246   /* The type of the last expression statement.  (This information is
 247      needed to implement the statement-expression extension.)  */
 248   tree x_last_expr_type;
 249   /* The last filename we recorded.  */
 250   const char *x_last_expr_filename;
 251   /* In C++, Nonzero if we should treat statements as full
 252      expressions.  In particular, this variable is no-zero if at the
 253      end of a statement we should destroy any temporaries created
 254      during that statement.  Similarly, if, at the end of a block, we
 255      should destroy any local variables in this block.  Normally, this
 256      variable is nonzero, since those are the normal semantics of
 257      C++.
 258
 259      However, in order to represent aggregate initialization code as
 260      tree structure, we use statement-expressions.  The statements
 261      within the statement expression should not result in cleanups
 262      being run until the entire enclosing statement is complete.
 263
 264      This flag has no effect in C.  */
 265   int stmts_are_full_exprs_p;
 266 };
 267
 268 typedef struct stmt_tree_s *stmt_tree;
 269
 270 /* Global state pertinent to the current function.  Some C dialects
 271    extend this structure with additional fields.  */
 272
 273 struct c_language_function GTY(()) {
 274   /* While we are parsing the function, this contains information
 275      about the statement-tree that we are building.  */
 276   struct stmt_tree_s x_stmt_tree;
 277   /* The stack of SCOPE_STMTs for the current function.  */
 278   tree x_scope_stmt_stack;
 279 };
 280
 281 /* When building a statement-tree, this is the last statement added to
 282    the tree.  */
 283
 284 #define last_tree (current_stmt_tree ()->x_last_stmt)
 285
 286 /* The type of the last expression-statement we have seen.  */
 287
 288 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 289
 290 /* The name of the last file we have seen.  */
 291
 292 #define last_expr_filename (current_stmt_tree ()->x_last_expr_filename)
 293
 294 /* LAST_TREE contains the last statement parsed.  These are chained
 295    together through the TREE_CHAIN field, but often need to be
 296    re-organized since the parse is performed bottom-up.  This macro
 297    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 298
 299 #define RECHAIN_STMTS(stmt, substmt)            \
 300   do {                                          \
 301     substmt = TREE_CHAIN (stmt);                \
 302     TREE_CHAIN (stmt) = NULL_TREE;              \
 303     last_tree = stmt;                           \
 304   } while (0)
 305
 306 /* Language-specific hooks.  */
 307
 308 extern int (*lang_statement_code_p)             PARAMS ((enum tree_code));
 309 extern void (*lang_expand_stmt)                 PARAMS ((tree));
 310 extern void (*lang_expand_decl_stmt)            PARAMS ((tree));
 311 extern void (*lang_expand_function_end)         PARAMS ((void));
 312 extern tree gettags                             PARAMS ((void));
 313
 314 /* Callback that determines if it's ok for a function to have no
 315    noreturn attribute.  */
 316 extern int (*lang_missing_noreturn_ok_p)        PARAMS ((tree));
 317
 318 extern int yyparse                              PARAMS ((void));
 319 extern void free_parser_stacks                  PARAMS ((void));
 320
 321 extern stmt_tree current_stmt_tree              PARAMS ((void));
 322 extern tree *current_scope_stmt_stack           PARAMS ((void));
 323 extern void begin_stmt_tree                     PARAMS ((tree *));
 324 extern tree add_stmt                            PARAMS ((tree));
 325 extern void add_decl_stmt                       PARAMS ((tree));
 326 extern tree add_scope_stmt                      PARAMS ((int, int));
 327 extern void finish_stmt_tree                    PARAMS ((tree *));
 328
 329 extern int statement_code_p                     PARAMS ((enum tree_code));
 330 extern tree walk_stmt_tree                      PARAMS ((tree *,
 331                                                          walk_tree_fn,
 332                                                          void *));
 333 extern void prep_stmt                           PARAMS ((tree));
 334 extern void expand_stmt                         PARAMS ((tree));
 335 extern void shadow_warning                      PARAMS ((const char *,
 336                                                          tree, tree));
 337 extern tree c_begin_if_stmt                     PARAMS ((void));
 338 extern tree c_begin_while_stmt                  PARAMS ((void));
 339 extern void c_finish_while_stmt_cond            PARAMS ((tree, tree));
 340
 341
 342 /* Extra information associated with a DECL.  Other C dialects extend
 343    this structure in various ways.  The C front-end only uses this
 344    structure for FUNCTION_DECLs; all other DECLs have a NULL
 345    DECL_LANG_SPECIFIC field.  */
 346
 347 struct c_lang_decl GTY(()) {
 348   unsigned declared_inline : 1;
 349 };
 350
 351 /* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
 352      the approximate number of statements in this function.  There is
 353      no need for this number to be exact; it is only used in various
 354      heuristics regarding optimization.  */
 355 #define DECL_NUM_STMTS(NODE) \
 356   (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
 357
 358 /* The variant of the C language being processed.  Each C language
 359    front-end defines this variable.  */
 360
 361 extern c_language_kind c_language;
 362
 363 /* Nonzero if we can read a PCH file now.  */
 364
 365 extern int allow_pch;
 366 \f
 367 /* Switches common to the C front ends.  */
 368
 369 /* Nonzero if prepreprocessing only.  */
 370
 371 extern int flag_preprocess_only;
 372
 373 /* The file name to which we should write a precompiled header, or
 374    NULL if no header will be written in this compile.  */
 375
 376 extern const char *pch_file;
 377
 378 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 379    user's namespace.  */
 380
 381 extern int flag_iso;
 382
 383 /* Nonzero whenever Objective-C functionality is being used.  */
 384 extern int flag_objc;
 385
 386 /* Nonzero if -undef was given.  It suppresses target built-in macros
 387    and assertions.  */
 388
 389 extern int flag_undef;
 390
 391 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 392
 393 extern int flag_no_builtin;
 394
 395 /* Nonzero means don't recognize the non-ANSI builtin functions.
 396    -ansi sets this.  */
 397
 398 extern int flag_no_nonansi_builtin;
 399
 400 /* Nonzero means give `double' the same size as `float'.  */
 401
 402 extern int flag_short_double;
 403
 404 /* Nonzero means give `wchar_t' the same size as `short'.  */
 405
 406 extern int flag_short_wchar;
 407
 408 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 409 extern int flag_ms_extensions;
 410
 411 /* Nonzero means don't recognize the keyword `asm'.  */
 412
 413 extern int flag_no_asm;
 414
 415 /* Nonzero means give string constants the type `const char *', as mandated
 416    by the standard.  */
 417
 418 extern int flag_const_strings;
 419
 420 /* Nonzero means `$' can be in an identifier.  */
 421
 422 extern int dollars_in_ident;
 423
 424 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 425
 426 extern int flag_signed_bitfields;
 427 extern int explicit_flag_signed_bitfields;
 428
 429 /* Nonzero means warn about pointer casts that can drop a type qualifier
 430    from the pointer target type.  */
 431
 432 extern int warn_cast_qual;
 433
 434 /* Warn about functions which might be candidates for format attributes.  */
 435
 436 extern int warn_missing_format_attribute;
 437
 438 /* Nonzero means warn about sizeof(function) or addition/subtraction
 439    of function pointers.  */
 440
 441 extern int warn_pointer_arith;
 442
 443 /* Nonzero means warn for any global function def
 444    without separate previous prototype decl.  */
 445
 446 extern int warn_missing_prototypes;
 447
 448 /* Warn if adding () is suggested.  */
 449
 450 extern int warn_parentheses;
 451
 452 /* Warn if initializer is not completely bracketed.  */
 453
 454 extern int warn_missing_braces;
 455
 456 /* Warn about comparison of signed and unsigned values.
 457    If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified.  */
 458
 459 extern int warn_sign_compare;
 460
 461 /* Nonzero means warn about usage of long long when `-pedantic'.  */
 462
 463 extern int warn_long_long;
 464
 465 /* Nonzero means warn about deprecated conversion from string constant to
 466    `char *'.  */
 467
 468 extern int warn_write_strings;
 469
 470 /* Nonzero means warn about multiple (redundant) decls for the same single
 471    variable or function.  */
 472
 473 extern int warn_redundant_decls;
 474
 475 /* Warn about testing equality of floating point numbers.  */
 476
 477 extern int warn_float_equal;
 478
 479 /* Warn about a subscript that has type char.  */
 480
 481 extern int warn_char_subscripts;
 482
 483 /* Warn if a type conversion is done that might have confusing results.  */
 484
 485 extern int warn_conversion;
 486
 487 /* Warn about #pragma directives that are not recognized.  */
 488
 489 extern int warn_unknown_pragmas; /* Tri state variable.  */
 490
 491 /* Warn about format/argument anomalies in calls to formatted I/O functions
 492    (*printf, *scanf, strftime, strfmon, etc.).  */
 493
 494 extern int warn_format;
 495
 496 /* Warn about Y2K problems with strftime formats.  */
 497
 498 extern int warn_format_y2k;
 499
 500 /* Warn about excess arguments to formats.  */
 501
 502 extern int warn_format_extra_args;
 503
 504 /* Warn about zero-length formats.  */
 505
 506 extern int warn_format_zero_length;
 507
 508 /* Warn about non-literal format arguments.  */
 509
 510 extern int warn_format_nonliteral;
 511
 512 /* Warn about possible security problems with calls to format functions.  */
 513
 514 extern int warn_format_security;
 515
 516
 517 /* C/ObjC language option variables.  */
 518
 519
 520 /* Nonzero means message about use of implicit function declarations;
 521  1 means warning; 2 means error.  */
 522
 523 extern int mesg_implicit_function_declaration;
 524
 525 /* Nonzero means allow type mismatches in conditional expressions;
 526    just make their values `void'.  */
 527
 528 extern int flag_cond_mismatch;
 529
 530 /* Nonzero means enable C89 Amendment 1 features.  */
 531
 532 extern int flag_isoc94;
 533
 534 /* Nonzero means use the ISO C99 dialect of C.  */
 535
 536 extern int flag_isoc99;
 537
 538 /* Nonzero means that we have builtin functions, and main is an int */
 539
 540 extern int flag_hosted;
 541
 542 /* Nonzero means add default format_arg attributes for functions not
 543    in ISO C.  */
 544
 545 extern int flag_noniso_default_format_attributes;
 546
 547 /* Nonzero means warn when casting a function call to a type that does
 548    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 549    when there is no previous declaration of sqrt or malloc.  */
 550
 551 extern int warn_bad_function_cast;
 552
 553 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 554
 555 extern int warn_traditional;
 556
 557 /* Nonzero means warn for non-prototype function decls
 558    or non-prototyped defs without previous prototype.  */
 559
 560 extern int warn_strict_prototypes;
 561
 562 /* Nonzero means warn for any global function def
 563    without separate previous decl.  */
 564
 565 extern int warn_missing_declarations;
 566
 567 /* Nonzero means warn about extern declarations of objects not at
 568    file-scope level and about *all* declarations of functions (whether
 569    extern or static) not at file-scope level.  Note that we exclude
 570    implicit function declarations.  To get warnings about those, use
 571    -Wimplicit.  */
 572
 573 extern int warn_nested_externs;
 574
 575 /* Warn if main is suspicious.  */
 576
 577 extern int warn_main;
 578
 579 /* Nonzero means warn about possible violations of sequence point rules.  */
 580
 581 extern int warn_sequence_point;
 582
 583 /* Nonzero means to warn about compile-time division by zero.  */
 584 extern int warn_div_by_zero;
 585
 586 /* Nonzero means warn about use of implicit int.  */
 587
 588 extern int warn_implicit_int;
 589
 590 /* Warn about NULL being passed to argument slots marked as requiring
 591    non-NULL.  */
 592
 593 extern int warn_nonnull;
 594
 595
 596 /* ObjC language option variables.  */
 597
 598
 599 /* Open and close the file for outputting class declarations, if
 600    requested (ObjC).  */
 601
 602 extern int flag_gen_declaration;
 603
 604 /* Generate code for GNU or NeXT runtime environment.  */
 605
 606 extern int flag_next_runtime;
 607
 608 /* Tells the compiler that this is a special run.  Do not perform any
 609    compiling, instead we are to test some platform dependent features
 610    and output a C header file with appropriate definitions.  */
 611
 612 extern int print_struct_values;
 613
 614 /* ???.  Undocumented.  */
 615
 616 extern const char *constant_string_class_name;
 617
 618 /* Warn if multiple methods are seen for the same selector, but with
 619    different argument types.  Performs the check on the whole selector
 620    table at the end of compilation.  */
 621
 622 extern int warn_selector;
 623
 624 /* Warn if a @selector() is found, and no method with that selector
 625    has been previously declared.  The check is done on each
 626    @selector() as soon as it is found - so it warns about forward
 627    declarations.  */
 628
 629 extern int warn_undeclared_selector;
 630
 631 /* Warn if methods required by a protocol are not implemented in the
 632    class adopting it.  When turned off, methods inherited to that
 633    class are also considered implemented.  */
 634
 635 extern int warn_protocol;
 636
 637
 638 /* C++ language option variables.  */
 639
 640
 641 /* Nonzero means don't recognize any extension keywords.  */
 642
 643 extern int flag_no_gnu_keywords;
 644
 645 /* Nonzero means do emit exported implementations of functions even if
 646    they can be inlined.  */
 647
 648 extern int flag_implement_inlines;
 649
 650 /* Nonzero means do emit exported implementations of templates, instead of
 651    multiple static copies in each file that needs a definition.  */
 652
 653 extern int flag_external_templates;
 654
 655 /* Nonzero means that the decision to emit or not emit the implementation of a
 656    template depends on where the template is instantiated, rather than where
 657    it is defined.  */
 658
 659 extern int flag_alt_external_templates;
 660
 661 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 662
 663 extern int flag_implicit_templates;
 664
 665 /* Nonzero means that implicit instantiations of inline templates will be
 666    emitted if needed, even if instantiations of non-inline templates
 667    aren't.  */
 668
 669 extern int flag_implicit_inline_templates;
 670
 671 /* Nonzero means generate separate instantiation control files and
 672    juggle them at link time.  */
 673
 674 extern int flag_use_repository;
 675
 676 /* Nonzero if we want to issue diagnostics that the standard says are not
 677    required.  */
 678
 679 extern int flag_optional_diags;
 680
 681 /* Nonzero means we should attempt to elide constructors when possible.  */
 682
 683 extern int flag_elide_constructors;
 684
 685 /* Nonzero means that member functions defined in class scope are
 686    inline by default.  */
 687
 688 extern int flag_default_inline;
 689
 690 /* Controls whether compiler generates 'type descriptor' that give
 691    run-time type information.  */
 692
 693 extern int flag_rtti;
 694
 695 /* Nonzero if we want to conserve space in the .o files.  We do this
 696    by putting uninitialized data and runtime initialized data into
 697    .common instead of .data at the expense of not flagging multiple
 698    definitions.  */
 699
 700 extern int flag_conserve_space;
 701
 702 /* Nonzero if we want to obey access control semantics.  */
 703
 704 extern int flag_access_control;
 705
 706 /* Nonzero if we want to check the return value of new and avoid calling
 707    constructors if it is a null pointer.  */
 708
 709 extern int flag_check_new;
 710
 711 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 712    initialization variables.
 713    0: Old rules, set by -fno-for-scope.
 714    2: New ISO rules, set by -ffor-scope.
 715    1: Try to implement new ISO rules, but with backup compatibility
 716    (and warnings).  This is the default, for now.  */
 717
 718 extern int flag_new_for_scope;
 719
 720 /* Nonzero if we want to emit defined symbols with common-like linkage as
 721    weak symbols where possible, in order to conform to C++ semantics.
 722    Otherwise, emit them as local symbols.  */
 723
 724 extern int flag_weak;
 725
 726 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 727    destructors for local statics and global objects.  */
 728
 729 extern int flag_use_cxa_atexit;
 730
 731 /* Nonzero means output .vtable_{entry,inherit} for use in doing vtable gc.  */
 732
 733 extern int flag_vtable_gc;
 734
 735 /* Nonzero means make the default pedwarns warnings instead of errors.
 736    The value of this flag is ignored if -pedantic is specified.  */
 737
 738 extern int flag_permissive;
 739
 740 /* Nonzero means to implement standard semantics for exception
 741    specifications, calling unexpected if an exception is thrown that
 742    doesn't match the specification.  Zero means to treat them as
 743    assertions and optimize accordingly, but not check them.  */
 744
 745 extern int flag_enforce_eh_specs;
 746
 747 /*  The version of the C++ ABI in use.  The following values are
 748     allowed:
 749
 750     0: The version of the ABI believed most conformant with the
 751        C++ ABI specification.  This ABI may change as bugs are
 752        discovered and fixed.  Therefore, 0 will not necessarily
 753        indicate the same ABI in different versions of G++.
 754
 755     1: The version of the ABI first used in G++ 3.2.
 756
 757     Additional positive integers will be assigned as new versions of
 758     the ABI become the default version of the ABI.  */
 759
 760 extern int flag_abi_version;
 761
 762 /* Nonzero means warn about things that will change when compiling
 763    with an ABI-compliant compiler.  */
 764
 765 extern int warn_abi;
 766
 767 /* Nonzero means warn about implicit declarations.  */
 768
 769 extern int warn_implicit;
 770
 771 /* Nonzero means warn when all ctors or dtors are private, and the class
 772    has no friends.  */
 773
 774 extern int warn_ctor_dtor_privacy;
 775
 776 /* Nonzero means warn in function declared in derived class has the
 777    same name as a virtual in the base class, but fails to match the
 778    type signature of any virtual function in the base class.  */
 779
 780 extern int warn_overloaded_virtual;
 781
 782 /* Nonzero means warn when declaring a class that has a non virtual
 783    destructor, when it really ought to have a virtual one.  */
 784
 785 extern int warn_nonvdtor;
 786
 787 /* Nonzero means warn when the compiler will reorder code.  */
 788
 789 extern int warn_reorder;
 790
 791 /* Nonzero means warn when synthesis behavior differs from Cfront's.  */
 792
 793 extern int warn_synth;
 794
 795 /* Nonzero means warn when we convert a pointer to member function
 796    into a pointer to (void or function).  */
 797
 798 extern int warn_pmf2ptr;
 799
 800 /* Nonzero means warn about violation of some Effective C++ style rules.  */
 801
 802 extern int warn_ecpp;
 803
 804 /* Nonzero means warn where overload resolution chooses a promotion from
 805    unsigned to signed over a conversion to an unsigned of the same size.  */
 806
 807 extern int warn_sign_promo;
 808
 809 /* Nonzero means warn when an old-style cast is used.  */
 810
 811 extern int warn_old_style_cast;
 812
 813 /* Nonzero means warn when non-templatized friend functions are
 814    declared within a template */
 815
 816 extern int warn_nontemplate_friend;
 817
 818 /* Nonzero means complain about deprecated features.  */
 819
 820 extern int warn_deprecated;
 821
 822 /* Maximum template instantiation depth.  This limit is rather
 823    arbitrary, but it exists to limit the time it takes to notice
 824    infinite template instantiations.  */
 825
 826 extern int max_tinst_depth;
 827
 828 /* Nonzero means the expression being parsed will never be evaluated.
 829    This is a count, since unevaluated expressions can nest.  */
 830
 831 extern int skip_evaluation;
 832
 833 /* C types are partitioned into three subsets: object, function, and
 834    incomplete types.  */
 835 #define C_TYPE_OBJECT_P(type) \
 836   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 837
 838 #define C_TYPE_INCOMPLETE_P(type) \
 839   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 840
 841 #define C_TYPE_FUNCTION_P(type) \
 842   (TREE_CODE (type) == FUNCTION_TYPE)
 843
 844 /* For convenience we define a single macro to identify the class of
 845    object or incomplete types.  */
 846 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 847   (!C_TYPE_FUNCTION_P (type))
 848
 849 /* Record in each node resulting from a binary operator
 850    what operator was specified for it.  */
 851 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 852
 853 /* Attribute table common to the C front ends.  */
 854 extern const struct attribute_spec c_common_attribute_table[];
 855 extern const struct attribute_spec c_common_format_attribute_table[];
 856
 857 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 858    ID is the identifier to use, NAME is the string.
 859    TYPE_DEP indicates whether it depends on type of the function or not
 860    (i.e. __PRETTY_FUNCTION__).  */
 861
 862 extern tree (*make_fname_decl)                  PARAMS ((tree, int));
 863
 864 extern tree identifier_global_value             PARAMS ((tree));
 865 extern void record_builtin_type                 PARAMS ((enum rid,
 866                                                          const char *, tree));
 867 extern tree build_void_list_node                PARAMS ((void));
 868 extern void start_fname_decls                   PARAMS ((void));
 869 extern void finish_fname_decls                  PARAMS ((void));
 870 extern const char *fname_as_string              PARAMS ((int));
 871 extern tree fname_decl                          PARAMS ((unsigned, tree));
 872 extern const char *fname_string                 PARAMS ((unsigned));
 873
 874 extern void check_function_arguments            PARAMS ((tree, tree));
 875 extern void check_function_arguments_recurse    PARAMS ((void (*) (void *,
 876                                                                    tree,
 877                                                                    unsigned HOST_WIDE_INT),
 878                                                          void *, tree,
 879                                                          unsigned HOST_WIDE_INT));
 880 extern void check_function_format               PARAMS ((int *, tree, tree));
 881 extern void set_Wformat                         PARAMS ((int));
 882 extern tree handle_format_attribute             PARAMS ((tree *, tree, tree,
 883                                                          int, bool *));
 884 extern tree handle_format_arg_attribute         PARAMS ((tree *, tree, tree,
 885                                                          int, bool *));
 886 extern void c_common_insert_default_attributes  PARAMS ((tree));
 887 extern int c_common_decode_option               PARAMS ((int, char **));
 888 extern tree c_common_type_for_mode              PARAMS ((enum machine_mode,
 889                                                          int));
 890 extern tree c_common_type_for_size              PARAMS ((unsigned int, int));
 891 extern tree c_common_unsigned_type              PARAMS ((tree));
 892 extern tree c_common_signed_type                PARAMS ((tree));
 893 extern tree c_common_signed_or_unsigned_type    PARAMS ((int, tree));
 894 extern tree c_common_truthvalue_conversion      PARAMS ((tree));
 895 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 896 extern tree c_sizeof_or_alignof_type    PARAMS ((tree, enum tree_code, int));
 897 extern tree c_alignof_expr                      PARAMS ((tree));
 898 /* Print an error message for invalid operands to arith operation CODE.
 899    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 900 extern void binary_op_error                     PARAMS ((enum tree_code));
 901 #define my_friendly_assert(EXP, N) (void) \
 902  (((EXP) == 0) ? (fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0) : 0)
 903
 904 extern tree c_expand_expr_stmt                  PARAMS ((tree));
 905 extern void c_expand_start_cond                 PARAMS ((tree, int, tree));
 906 extern void c_finish_then                       PARAMS ((void));
 907 extern void c_expand_start_else                 PARAMS ((void));
 908 extern void c_finish_else                       PARAMS ((void));
 909 extern void c_expand_end_cond                   PARAMS ((void));
 910 /* Validate the expression after `case' and apply default promotions.  */
 911 extern tree check_case_value                    PARAMS ((tree));
 912 extern tree fix_string_type                     PARAMS ((tree));
 913 struct varray_head_tag;
 914 extern tree combine_strings             PARAMS ((struct varray_head_tag *));
 915 extern void constant_expression_warning         PARAMS ((tree));
 916 extern tree convert_and_check                   PARAMS ((tree, tree));
 917 extern void overflow_warning                    PARAMS ((tree));
 918 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 919
 920 /* Read the rest of the current #-directive line.  */
 921 extern char *get_directive_line                 PARAMS ((void));
 922 #define GET_DIRECTIVE_LINE() get_directive_line ()
 923 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 1)
 924 #define c_alignof(T) c_sizeof_or_alignof_type (T, ALIGNOF_EXPR, 1)
 925
 926 /* Subroutine of build_binary_op, used for comparison operations.
 927    See if the operands have both been converted from subword integer types
 928    and, if so, perhaps change them both back to their original type.  */
 929 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 930
 931 extern tree pointer_int_sum                     PARAMS ((enum tree_code, tree, tree));
 932 extern unsigned int min_precision               PARAMS ((tree, int));
 933
 934 /* Add qualifiers to a type, in the fashion for C.  */
 935 extern tree c_build_qualified_type              PARAMS ((tree, int));
 936
 937 /* Build tree nodes and builtin functions common to both C and C++ language
 938    frontends.  */
 939 extern void c_common_nodes_and_builtins         PARAMS ((void));
 940
 941 extern void disable_builtin_function            PARAMS ((const char *));
 942
 943 extern tree build_va_arg                        PARAMS ((tree, tree));
 944
 945 extern void c_common_init_options               PARAMS ((enum c_language_kind));
 946 extern bool c_common_post_options               PARAMS ((void));
 947 extern const char *c_common_init                PARAMS ((const char *));
 948 extern void c_common_finish                     PARAMS ((void));
 949 extern void c_common_parse_file                 PARAMS ((int));
 950 extern HOST_WIDE_INT c_common_get_alias_set     PARAMS ((tree));
 951 extern bool c_promoting_integer_type_p          PARAMS ((tree));
 952 extern int self_promoting_args_p                PARAMS ((tree));
 953 extern tree strip_array_types                   PARAMS ((tree));
 954
 955 /* These macros provide convenient access to the various _STMT nodes.  */
 956
 957 /* Nonzero if this statement should be considered a full-expression,
 958    i.e., if temporaries created during this statement should have
 959    their destructors run at the end of this statement.  (In C, this
 960    will always be false, since there are no destructors.)  */
 961 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 962
 963 /* IF_STMT accessors. These give access to the condition of the if
 964    statement, the then block of the if statement, and the else block
 965    of the if statement if it exists.  */
 966 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 967 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 968 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 969
 970 /* WHILE_STMT accessors. These give access to the condition of the
 971    while statement and the body of the while statement, respectively.  */
 972 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 973 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 974
 975 /* DO_STMT accessors. These give access to the condition of the do
 976    statement and the body of the do statement, respectively.  */
 977 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 978 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 979
 980 /* RETURN_STMT accessors. These give the expression associated with a
 981    return statement, and whether it should be ignored when expanding
 982    (as opposed to inlining).  */
 983 #define RETURN_STMT_EXPR(NODE)  TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 984
 985 /* EXPR_STMT accessor. This gives the expression associated with an
 986    expression statement.  */
 987 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 988
 989 /* FOR_STMT accessors. These give access to the init statement,
 990    condition, update expression, and body of the for statement,
 991    respectively.  */
 992 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 993 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 994 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 995 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 996
 997 /* SWITCH_STMT accessors. These give access to the condition, body and
 998    original condition type (before any compiler conversions)
 999    of the switch statement, respectively.  */
1000 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
1001 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
1002 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
1003
1004 /* CASE_LABEL accessors. These give access to the high and low values
1005    of a case label, respectively.  */
1006 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
1007 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
1008 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
1009
1010 /* GOTO_STMT accessor. This gives access to the label associated with
1011    a goto statement.  */
1012 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
1013 /* True for goto created artificially by the compiler.  */
1014 #define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
1015
1016 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
1017    statements associated with a compound statement. The result is the
1018    first statement in the list. Succeeding nodes can be accessed by
1019    calling TREE_CHAIN on a node in the list.  */
1020 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
1021
1022 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
1023    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
1024    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
1025    statement.  */
1026 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
1027 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
1028 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
1029 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
1030 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
1031
1032 /* DECL_STMT accessor. This gives access to the DECL associated with
1033    the given declaration statement.  */
1034 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
1035
1036 /* STMT_EXPR accessor.  */
1037 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
1038
1039 /* Nonzero if this statement-expression does not have an associated scope.  */
1040 #define STMT_EXPR_NO_SCOPE(NODE) \
1041    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
1042
1043 /* LABEL_STMT accessor. This gives access to the label associated with
1044    the given label statement.  */
1045 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
1046
1047 /* COMPOUND_LITERAL_EXPR accessors.  */
1048 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
1049   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
1050 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
1051   DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
1052
1053 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
1054 #define SCOPE_BEGIN_P(NODE) \
1055   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
1056
1057 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
1058 #define SCOPE_END_P(NODE) \
1059   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
1060
1061 /* The BLOCK containing the declarations contained in this scope.  */
1062 #define SCOPE_STMT_BLOCK(NODE) \
1063   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
1064
1065 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
1066 #define SCOPE_NULLIFIED_P(NODE) \
1067   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
1068
1069 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
1070    which should be treated as non-existent from the point of view of
1071    running cleanup actions.  */
1072 #define SCOPE_NO_CLEANUPS_P(NODE) \
1073   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
1074
1075 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
1076    For example, in:
1077
1078      S s;
1079      l:
1080      S s2;
1081      goto l;
1082
1083    there is (implicitly) a new scope after `l', even though there are
1084    no curly braces.  In particular, when we hit the goto, we must
1085    destroy s2 and then re-construct it.  For the implicit scope,
1086    SCOPE_PARTIAL_P will be set.  */
1087 #define SCOPE_PARTIAL_P(NODE) \
1088   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
1089
1090 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
1091 #define ASM_VOLATILE_P(NODE)                    \
1092   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
1093
1094 /* The VAR_DECL to clean up in a CLEANUP_STMT.  */
1095 #define CLEANUP_DECL(NODE) \
1096   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
1097 /* The cleanup to run in a CLEANUP_STMT.  */
1098 #define CLEANUP_EXPR(NODE) \
1099   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
1100
1101 /* The filename we are changing to as of this FILE_STMT.  */
1102 #define FILE_STMT_FILENAME_NODE(NODE) \
1103   (TREE_OPERAND (FILE_STMT_CHECK (NODE), 0))
1104 #define FILE_STMT_FILENAME(NODE) \
1105   (IDENTIFIER_POINTER (FILE_STMT_FILENAME_NODE (NODE)))
1106
1107 /* The line-number at which a statement began.  But if
1108    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
1109    line number for the end of the current function instead.  */
1110 #define STMT_LINENO(NODE)                       \
1111   (TREE_COMPLEXITY ((NODE)))
1112
1113 /* If nonzero, the STMT_LINENO for NODE is the line at which the
1114    function ended.  */
1115 #define STMT_LINENO_FOR_FN_P(NODE)              \
1116   (TREE_LANG_FLAG_2 ((NODE)))
1117
1118 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
1119    initialization variables.  */
1120 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
1121
1122 /* Nonzero if we want to create an ASM_INPUT instead of an
1123    ASM_OPERAND with no operands.  */
1124 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
1125
1126 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
1127
1128 enum c_tree_code {
1129   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
1130 #include "c-common.def"
1131   LAST_C_TREE_CODE
1132 };
1133
1134 #undef DEFTREECODE
1135
1136 extern void genrtl_do_pushlevel                 PARAMS ((void));
1137 extern void genrtl_goto_stmt                    PARAMS ((tree));
1138 extern void genrtl_expr_stmt                    PARAMS ((tree));
1139 extern void genrtl_expr_stmt_value              PARAMS ((tree, int, int));
1140 extern void genrtl_decl_stmt                    PARAMS ((tree));
1141 extern void genrtl_if_stmt                      PARAMS ((tree));
1142 extern void genrtl_while_stmt                   PARAMS ((tree));
1143 extern void genrtl_do_stmt                      PARAMS ((tree));
1144 extern void genrtl_return_stmt                  PARAMS ((tree));
1145 extern void genrtl_for_stmt                     PARAMS ((tree));
1146 extern void genrtl_break_stmt                   PARAMS ((void));
1147 extern void genrtl_continue_stmt                PARAMS ((void));
1148 extern void genrtl_scope_stmt                   PARAMS ((tree));
1149 extern void genrtl_switch_stmt                  PARAMS ((tree));
1150 extern void genrtl_case_label                   PARAMS ((tree));
1151 extern void genrtl_compound_stmt                PARAMS ((tree));
1152 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
1153                                                          tree, tree,
1154                                                          tree, int));
1155 extern void genrtl_decl_cleanup                 PARAMS ((tree));
1156 extern int stmts_are_full_exprs_p               PARAMS ((void));
1157 extern int anon_aggr_type_p                     PARAMS ((tree));
1158
1159 /* For a VAR_DECL that is an anonymous union, these are the various
1160    sub-variables that make up the anonymous union.  */
1161 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
1162
1163 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
1164 #define DECL_C_BIT_FIELD(NODE) \
1165   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
1166 #define SET_DECL_C_BIT_FIELD(NODE) \
1167   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
1168 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
1169   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
1170
1171 /* In a VAR_DECL, nonzero if the decl is a register variable with
1172    an explicit asm specification.  */
1173 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
1174
1175 extern void emit_local_var                      PARAMS ((tree));
1176 extern void make_rtl_for_local_static           PARAMS ((tree));
1177 extern tree expand_cond                         PARAMS ((tree));
1178 extern tree c_expand_return                     PARAMS ((tree));
1179 extern tree do_case                             PARAMS ((tree, tree));
1180 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
1181 extern tree build_case_label                    PARAMS ((tree, tree, tree));
1182 extern tree build_continue_stmt                 PARAMS ((void));
1183 extern tree build_break_stmt                    PARAMS ((void));
1184 extern tree build_return_stmt                   PARAMS ((tree));
1185
1186 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
1187
1188 /* Used by the C++ frontend to mark the block around the member
1189    initializers and cleanups.  */
1190 #define COMPOUND_STMT_BODY_BLOCK(NODE)  TREE_LANG_FLAG_3 (NODE)
1191
1192 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
1193
1194 /* These functions must be defined by each front-end which implements
1195    a variant of the C language.  They are used in c-common.c.  */
1196
1197 extern tree build_unary_op                      PARAMS ((enum tree_code,
1198                                                          tree, int));
1199 extern tree build_binary_op                     PARAMS ((enum tree_code,
1200                                                          tree, tree, int));
1201 extern int lvalue_p                             PARAMS ((tree));
1202 extern tree default_conversion                  PARAMS ((tree));
1203
1204 /* Given two integer or real types, return the type for their sum.
1205    Given two compatible ANSI C types, returns the merged type.  */
1206
1207 extern tree common_type                         PARAMS ((tree, tree));
1208
1209 extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
1210
1211 extern tree decl_constant_value         PARAMS ((tree));
1212
1213 /* Handle increment and decrement of boolean types.  */
1214 extern tree boolean_increment                   PARAMS ((enum tree_code,
1215                                                          tree));
1216
1217 /* Hook currently used only by the C++ front end to reset internal state
1218    after entering or leaving a header file.  */
1219 extern void extract_interface_info              PARAMS ((void));
1220
1221 extern int case_compare                         PARAMS ((splay_tree_key,
1222                                                          splay_tree_key));
1223
1224 extern tree c_add_case_label                    PARAMS ((splay_tree,
1225                                                          tree, tree,
1226                                                          tree));
1227
1228 extern tree build_function_call                 PARAMS ((tree, tree));
1229
1230 extern tree finish_label_address_expr           PARAMS ((tree));
1231
1232 /* Same function prototype, but the C and C++ front ends have
1233    different implementations.  Used in c-common.c.  */
1234 extern tree lookup_label                        PARAMS ((tree));
1235
1236 extern rtx c_expand_expr                        PARAMS ((tree, rtx,
1237                                                          enum machine_mode,
1238                                                          int));
1239
1240 extern int c_safe_from_p                        PARAMS ((rtx, tree));
1241
1242 extern int c_staticp                            PARAMS ((tree));
1243
1244 extern int c_common_unsafe_for_reeval           PARAMS ((tree));
1245
1246 extern const char *init_c_lex                   PARAMS ((const char *));
1247
1248 extern void cb_register_builtins                PARAMS ((cpp_reader *));
1249
1250 /* Positive if an implicit `extern "C"' scope has just been entered;
1251    negative if such a scope has just been exited.  */
1252 extern int pending_lang_change;
1253
1254 /* Information recorded about each file examined during compilation.  */
1255
1256 struct c_fileinfo
1257 {
1258   int time;     /* Time spent in the file.  */
1259   short interface_only;         /* Flags - used only by C++ */
1260   short interface_unknown;
1261 };
1262
1263 struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
1264 extern void dump_time_statistics                PARAMS ((void));
1265
1266 extern int c_dump_tree                          PARAMS ((void *, tree));
1267
1268 extern void pch_init                            PARAMS ((void));
1269 extern int c_common_valid_pch                   PARAMS ((cpp_reader *pfile,
1270                                                          const char *name,
1271                                                          int fd));
1272 extern void c_common_read_pch                   PARAMS ((cpp_reader *pfile,
1273                                                          const char *name,
1274                                                          int fd,
1275                                                          const char *orig));
1276 extern void c_common_write_pch                  PARAMS ((void));
1277
1278 #endif /* ! GCC_C_COMMON_H */