gcc/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004 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 #include "ggc.h"
  28
  29 /* Usage of TREE_LANG_FLAG_?:
  30    0: COMPOUND_STMT_NO_SCOPE (in COMPOUND_STMT).
  31       TREE_NEGATED_INT (in INTEGER_CST).
  32       IDENTIFIER_MARKED (used by search routines).
  33       SCOPE_BEGIN_P (in SCOPE_STMT)
  34       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  35       NEW_FOR_SCOPE_P (in FOR_STMT)
  36       ASM_INPUT_P (in ASM_STMT)
  37       STMT_EXPR_NO_SCOPE (in STMT_EXPR)
  38    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  39       STMT_IS_FULL_EXPR_P (in _STMT)
  40    2: unused
  41    3: SCOPE_NO_CLEANUPS_P (in SCOPE_STMT)
  42       COMPOUND_STMT_BODY_BLOCK (in COMPOUND_STMT)
  43    4: SCOPE_PARTIAL_P (in SCOPE_STMT)
  44 */
  45
  46 /* Reserved identifiers.  This is the union of all the keywords for C,
  47    C++, and Objective-C.  All the type modifiers have to be in one
  48    block at the beginning, because they are used as mask bits.  There
  49    are 27 type modifiers; if we add many more we will have to redesign
  50    the mask mechanism.  */
  51
  52 enum rid
  53 {
  54   /* Modifiers: */
  55   /* C, in empirical order of frequency.  */
  56   RID_STATIC = 0,
  57   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  58   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  59   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  60
  61   /* C extensions */
  62   RID_COMPLEX, RID_THREAD,
  63
  64   /* C++ */
  65   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  66
  67   /* ObjC */
  68   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  69
  70   /* C */
  71   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  72   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  73   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  74   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  75   RID_SIZEOF,
  76
  77   /* C extensions */
  78   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  79   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
  80   RID_PTREXTENT, RID_PTRVALUE, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
  81
  82   /* Too many ways of getting the name of a function as a string */
  83   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  84
  85   /* C++ */
  86   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  87   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  88   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  89   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  90   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  91   RID_THIS,     RID_THROW,    RID_TRUE,
  92   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  93   RID_USING,
  94
  95   /* casts */
  96   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  97
  98   /* Objective-C */
  99   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
 100   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 101   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 102   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 103   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 104   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 105   RID_AT_INTERFACE,
 106   RID_AT_IMPLEMENTATION,
 107
 108   RID_MAX,
 109
 110   RID_FIRST_MODIFIER = RID_STATIC,
 111   RID_LAST_MODIFIER = RID_ONEWAY,
 112
 113   RID_FIRST_AT = RID_AT_ENCODE,
 114   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 115   RID_FIRST_PQ = RID_IN,
 116   RID_LAST_PQ = RID_ONEWAY
 117 };
 118
 119 #define OBJC_IS_AT_KEYWORD(rid) \
 120   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 121    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 122
 123 #define OBJC_IS_PQ_KEYWORD(rid) \
 124   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 125    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 126
 127 /* The elements of `ridpointers' are identifier nodes for the reserved
 128    type names and storage classes.  It is indexed by a RID_... value.  */
 129 extern GTY ((length ("(int)RID_MAX"))) tree *ridpointers;
 130
 131 /* Standard named or nameless data types of the C compiler.  */
 132
 133 enum c_tree_index
 134 {
 135     CTI_WCHAR_TYPE,
 136     CTI_SIGNED_WCHAR_TYPE,
 137     CTI_UNSIGNED_WCHAR_TYPE,
 138     CTI_WINT_TYPE,
 139     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 140     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 141     CTI_INTMAX_TYPE,
 142     CTI_UINTMAX_TYPE,
 143     CTI_WIDEST_INT_LIT_TYPE,
 144     CTI_WIDEST_UINT_LIT_TYPE,
 145
 146     CTI_CHAR_ARRAY_TYPE,
 147     CTI_WCHAR_ARRAY_TYPE,
 148     CTI_INT_ARRAY_TYPE,
 149     CTI_STRING_TYPE,
 150     CTI_CONST_STRING_TYPE,
 151
 152     /* Type for boolean expressions (bool in C++, int in C).  */
 153     CTI_TRUTHVALUE_TYPE,
 154     CTI_TRUTHVALUE_TRUE,
 155     CTI_TRUTHVALUE_FALSE,
 156
 157     CTI_DEFAULT_FUNCTION_TYPE,
 158
 159     /* These are not types, but we have to look them up all the time.  */
 160     CTI_FUNCTION_NAME_DECL,
 161     CTI_PRETTY_FUNCTION_NAME_DECL,
 162     CTI_C99_FUNCTION_NAME_DECL,
 163     CTI_SAVED_FUNCTION_NAME_DECLS,
 164
 165     CTI_VOID_ZERO,
 166
 167     CTI_MAX
 168 };
 169
 170 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 171
 172 /* Identifier part common to the C front ends.  Inherits from
 173    tree_identifier, despite appearances.  */
 174 struct c_common_identifier GTY(())
 175 {
 176   struct tree_common common;
 177   struct cpp_hashnode node;
 178 };
 179
 180 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 181 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 182 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 183 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 184 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 185 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 186 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 187 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 188 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 189 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 190
 191 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 192 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 193 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 194
 195 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 196 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 197 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 198 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 199 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 200
 201 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 202
 203 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 204 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 205 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 206 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 207
 208 /* A node for `((void) 0)'.  */
 209 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 210
 211 extern GTY(()) tree c_global_trees[CTI_MAX];
 212
 213 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 214    tree for size reasons.  */
 215 struct sorted_fields_type GTY(())
 216 {
 217   int len;
 218   tree GTY((length ("%h.len"))) elts[1];
 219 };
 220
 221 /* Mark which labels are explicitly declared.
 222    These may be shadowed, and may be referenced from nested functions.  */
 223 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 224
 225 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 226    warning if they undergo concatenation.  */
 227 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 228
 229 typedef enum c_language_kind
 230 {
 231   clk_c         = 0,            /* C90, C94 or C99 */
 232   clk_objc      = 1,            /* clk_c with ObjC features.  */
 233   clk_cxx       = 2,            /* ANSI/ISO C++ */
 234   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 235 }
 236 c_language_kind;
 237
 238 /* To test for a specific language use c_language, defined by each
 239    front end.  For "ObjC features" or "not C++" use the macros.  */
 240 extern c_language_kind c_language;
 241
 242 #define c_dialect_cxx()         (c_language & clk_cxx)
 243 #define c_dialect_objc()        (c_language & clk_objc)
 244
 245 /* Information about a statement tree.  */
 246
 247 struct stmt_tree_s GTY(()) {
 248   /* The last statement added to the tree.  */
 249   tree x_last_stmt;
 250   /* The type of the last expression statement.  (This information is
 251      needed to implement the statement-expression extension.)  */
 252   tree x_last_expr_type;
 253   /* The last filename we recorded.  */
 254   const char *x_last_expr_filename;
 255   /* In C++, Nonzero if we should treat statements as full
 256      expressions.  In particular, this variable is no-zero if at the
 257      end of a statement we should destroy any temporaries created
 258      during that statement.  Similarly, if, at the end of a block, we
 259      should destroy any local variables in this block.  Normally, this
 260      variable is nonzero, since those are the normal semantics of
 261      C++.
 262
 263      However, in order to represent aggregate initialization code as
 264      tree structure, we use statement-expressions.  The statements
 265      within the statement expression should not result in cleanups
 266      being run until the entire enclosing statement is complete.
 267
 268      This flag has no effect in C.  */
 269   int stmts_are_full_exprs_p;
 270 };
 271
 272 typedef struct stmt_tree_s *stmt_tree;
 273
 274 /* Global state pertinent to the current function.  Some C dialects
 275    extend this structure with additional fields.  */
 276
 277 struct c_language_function GTY(()) {
 278   /* While we are parsing the function, this contains information
 279      about the statement-tree that we are building.  */
 280   struct stmt_tree_s x_stmt_tree;
 281   /* The stack of SCOPE_STMTs for the current function.  */
 282   tree x_scope_stmt_stack;
 283 };
 284
 285 /* When building a statement-tree, this is the last statement added to
 286    the tree.  */
 287
 288 #define last_tree (current_stmt_tree ()->x_last_stmt)
 289
 290 /* The type of the last expression-statement we have seen.  */
 291
 292 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 293
 294 /* The name of the last file we have seen.  */
 295
 296 #define last_expr_filename (current_stmt_tree ()->x_last_expr_filename)
 297
 298 /* LAST_TREE contains the last statement parsed.  These are chained
 299    together through the TREE_CHAIN field, but often need to be
 300    re-organized since the parse is performed bottom-up.  This macro
 301    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 302
 303 #define RECHAIN_STMTS(stmt, substmt)            \
 304   do {                                          \
 305     substmt = TREE_CHAIN (stmt);                \
 306     TREE_CHAIN (stmt) = NULL_TREE;              \
 307     last_tree = stmt;                           \
 308   } while (0)
 309
 310 /* Language-specific hooks.  */
 311
 312 extern int (*lang_gimplify_stmt) (tree *, tree *);
 313 extern void (*lang_expand_function_end) (void);
 314
 315 /* Callback that determines if it's ok for a function to have no
 316    noreturn attribute.  */
 317 extern int (*lang_missing_noreturn_ok_p) (tree);
 318
 319 extern void push_file_scope (void);
 320 extern void pop_file_scope (void);
 321 extern int yyparse (void);
 322 extern stmt_tree current_stmt_tree (void);
 323 extern tree *current_scope_stmt_stack (void);
 324 extern void begin_stmt_tree (tree *);
 325 extern tree add_stmt (tree);
 326 extern void add_decl_stmt (tree);
 327 extern tree add_scope_stmt (int, int);
 328 extern void finish_stmt_tree (tree *);
 329
 330 extern tree walk_stmt_tree (tree *, walk_tree_fn, void *);
 331 extern void prep_stmt (tree);
 332 extern tree c_begin_if_stmt (void);
 333 extern tree c_begin_while_stmt (void);
 334 extern void c_finish_while_stmt_cond (tree, tree);
 335
 336 extern int field_decl_cmp (const void *, const void *);
 337 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 338                                   void *);
 339 \f
 340 /* Switches common to the C front ends.  */
 341
 342 /* Nonzero if prepreprocessing only.  */
 343
 344 extern int flag_preprocess_only;
 345
 346 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 347    calls will be used in ObjC; passing nil receivers to such calls
 348    will most likely result in crashes.  */
 349 extern int flag_nil_receivers;
 350
 351 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 352    @try, etc.) in source code.  */
 353 extern int flag_objc_exceptions;
 354
 355 /* Nonzero means that code generation will be altered to support
 356    "zero-link" execution.  This currently affects ObjC only, but may
 357    affect other languages in the future.  */
 358 extern int flag_zero_link;
 359
 360 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 361    unit.  It will inform the ObjC runtime that class definition(s) herein
 362    contained are to replace one(s) previously loaded.  */
 363 extern int flag_replace_objc_classes;
 364
 365 /* Nonzero means don't output line number information.  */
 366
 367 extern char flag_no_line_commands;
 368
 369 /* Nonzero causes -E output not to be done, but directives such as
 370    #define that have side effects are still obeyed.  */
 371
 372 extern char flag_no_output;
 373
 374 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 375    'N' of the command line switch.  */
 376
 377 extern char flag_dump_macros;
 378
 379 /* Nonzero means pass #include lines through to the output.  */
 380
 381 extern char flag_dump_includes;
 382
 383 /* The file name to which we should write a precompiled header, or
 384    NULL if no header will be written in this compile.  */
 385
 386 extern const char *pch_file;
 387
 388 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 389    user's namespace.  */
 390
 391 extern int flag_iso;
 392
 393 /* Nonzero if -undef was given.  It suppresses target built-in macros
 394    and assertions.  */
 395
 396 extern int flag_undef;
 397
 398 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 399
 400 extern int flag_no_builtin;
 401
 402 /* Nonzero means don't recognize the non-ANSI builtin functions.
 403    -ansi sets this.  */
 404
 405 extern int flag_no_nonansi_builtin;
 406
 407 /* Nonzero means give `double' the same size as `float'.  */
 408
 409 extern int flag_short_double;
 410
 411 /* Nonzero means give `wchar_t' the same size as `short'.  */
 412
 413 extern int flag_short_wchar;
 414
 415 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 416 extern int flag_ms_extensions;
 417
 418 /* Nonzero means don't recognize the keyword `asm'.  */
 419
 420 extern int flag_no_asm;
 421
 422 /* Nonzero means give string constants the type `const char *', as mandated
 423    by the standard.  */
 424
 425 extern int flag_const_strings;
 426
 427 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 428
 429 extern int flag_signed_bitfields;
 430 extern int explicit_flag_signed_bitfields;
 431
 432 /* Nonzero means warn about pointer casts that can drop a type qualifier
 433    from the pointer target type.  */
 434
 435 extern int warn_cast_qual;
 436
 437 /* Warn about functions which might be candidates for format attributes.  */
 438
 439 extern int warn_missing_format_attribute;
 440
 441 /* Nonzero means warn about sizeof(function) or addition/subtraction
 442    of function pointers.  */
 443
 444 extern int warn_pointer_arith;
 445
 446 /* Nonzero means warn for any global function def
 447    without separate previous prototype decl.  */
 448
 449 extern int warn_missing_prototypes;
 450
 451 /* Warn if adding () is suggested.  */
 452
 453 extern int warn_parentheses;
 454
 455 /* Warn if initializer is not completely bracketed.  */
 456
 457 extern int warn_missing_braces;
 458
 459 /* Warn about comparison of signed and unsigned values.
 460    If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified.  */
 461
 462 extern int warn_sign_compare;
 463
 464 /* Nonzero means warn about usage of long long when `-pedantic'.  */
 465
 466 extern int warn_long_long;
 467
 468 /* Nonzero means warn about deprecated conversion from string constant to
 469    `char *'.  */
 470
 471 extern int warn_write_strings;
 472
 473 /* Nonzero means warn about multiple (redundant) decls for the same single
 474    variable or function.  */
 475
 476 extern int warn_redundant_decls;
 477
 478 /* Warn about testing equality of floating point numbers.  */
 479
 480 extern int warn_float_equal;
 481
 482 /* Warn about a subscript that has type char.  */
 483
 484 extern int warn_char_subscripts;
 485
 486 /* Warn if a type conversion is done that might have confusing results.  */
 487
 488 extern int warn_conversion;
 489
 490 /* Warn about #pragma directives that are not recognized.  */
 491
 492 extern int warn_unknown_pragmas; /* Tri state variable.  */
 493
 494 /* Warn about format/argument anomalies in calls to formatted I/O functions
 495    (*printf, *scanf, strftime, strfmon, etc.).  */
 496
 497 extern int warn_format;
 498
 499 /* Warn about Y2K problems with strftime formats.  */
 500
 501 extern int warn_format_y2k;
 502
 503 /* Warn about excess arguments to formats.  */
 504
 505 extern int warn_format_extra_args;
 506
 507 /* Warn about zero-length formats.  */
 508
 509 extern int warn_format_zero_length;
 510
 511 /* Warn about non-literal format arguments.  */
 512
 513 extern int warn_format_nonliteral;
 514
 515 /* Warn about possible security problems with calls to format functions.  */
 516
 517 extern int warn_format_security;
 518
 519
 520 /* C/ObjC language option variables.  */
 521
 522
 523 /* Nonzero means message about use of implicit function declarations;
 524  1 means warning; 2 means error.  */
 525
 526 extern int mesg_implicit_function_declaration;
 527
 528 /* Nonzero means allow type mismatches in conditional expressions;
 529    just make their values `void'.  */
 530
 531 extern int flag_cond_mismatch;
 532
 533 /* Nonzero means enable C89 Amendment 1 features.  */
 534
 535 extern int flag_isoc94;
 536
 537 /* Nonzero means use the ISO C99 dialect of C.  */
 538
 539 extern int flag_isoc99;
 540
 541 /* Nonzero means that we have builtin functions, and main is an int.  */
 542
 543 extern int flag_hosted;
 544
 545 /* Nonzero means warn when casting a function call to a type that does
 546    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 547    when there is no previous declaration of sqrt or malloc.  */
 548
 549 extern int warn_bad_function_cast;
 550
 551 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 552
 553 extern int warn_traditional;
 554
 555 /* Nonzero means warn for a declaration found after a statement.  */
 556
 557 extern int warn_declaration_after_statement;
 558
 559 /* Nonzero means warn for non-prototype function decls
 560    or non-prototyped defs without previous prototype.  */
 561
 562 extern int warn_strict_prototypes;
 563
 564 /* Nonzero means warn for any global function def
 565    without separate previous decl.  */
 566
 567 extern int warn_missing_declarations;
 568
 569 /* Nonzero means warn about extern declarations of objects not at
 570    file-scope level and about *all* declarations of functions (whether
 571    extern or static) not at file-scope level.  Note that we exclude
 572    implicit function declarations.  To get warnings about those, use
 573    -Wimplicit.  */
 574
 575 extern int warn_nested_externs;
 576
 577 /* Warn if main is suspicious.  */
 578
 579 extern int warn_main;
 580
 581 /* Nonzero means warn about possible violations of sequence point rules.  */
 582
 583 extern int warn_sequence_point;
 584
 585 /* Nonzero means warn about uninitialized variable when it is initialized with itself.
 586    For example: int i = i;, GCC will not warn about this when warn_init_self is nonzero.  */
 587
 588 extern int warn_init_self;
 589
 590
 591 /* Nonzero means to warn about compile-time division by zero.  */
 592 extern int warn_div_by_zero;
 593
 594 /* Nonzero means warn about use of implicit int.  */
 595
 596 extern int warn_implicit_int;
 597
 598 /* Warn about NULL being passed to argument slots marked as requiring
 599    non-NULL.  */
 600
 601 extern int warn_nonnull;
 602
 603 /* Warn about old-style parameter declaration.  */
 604
 605 extern int warn_old_style_definition;
 606
 607
 608 /* ObjC language option variables.  */
 609
 610
 611 /* Open and close the file for outputting class declarations, if
 612    requested (ObjC).  */
 613
 614 extern int flag_gen_declaration;
 615
 616 /* Generate code for GNU or NeXT runtime environment.  */
 617
 618 extern int flag_next_runtime;
 619
 620 /* Tells the compiler that this is a special run.  Do not perform any
 621    compiling, instead we are to test some platform dependent features
 622    and output a C header file with appropriate definitions.  */
 623
 624 extern int print_struct_values;
 625
 626 /* ???.  Undocumented.  */
 627
 628 extern const char *constant_string_class_name;
 629
 630 /* Warn if multiple methods are seen for the same selector, but with
 631    different argument types.  Performs the check on the whole selector
 632    table at the end of compilation.  */
 633
 634 extern int warn_selector;
 635
 636 /* Warn if a @selector() is found, and no method with that selector
 637    has been previously declared.  The check is done on each
 638    @selector() as soon as it is found - so it warns about forward
 639    declarations.  */
 640
 641 extern int warn_undeclared_selector;
 642
 643 /* Warn if methods required by a protocol are not implemented in the
 644    class adopting it.  When turned off, methods inherited to that
 645    class are also considered implemented.  */
 646
 647 extern int warn_protocol;
 648
 649
 650 /* C++ language option variables.  */
 651
 652
 653 /* Nonzero means don't recognize any extension keywords.  */
 654
 655 extern int flag_no_gnu_keywords;
 656
 657 /* Nonzero means do emit exported implementations of functions even if
 658    they can be inlined.  */
 659
 660 extern int flag_implement_inlines;
 661
 662 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 663
 664 extern int flag_implicit_templates;
 665
 666 /* Nonzero means that implicit instantiations of inline templates will be
 667    emitted if needed, even if instantiations of non-inline templates
 668    aren't.  */
 669
 670 extern int flag_implicit_inline_templates;
 671
 672 /* Nonzero means generate separate instantiation control files and
 673    juggle them at link time.  */
 674
 675 extern int flag_use_repository;
 676
 677 /* Nonzero if we want to issue diagnostics that the standard says are not
 678    required.  */
 679
 680 extern int flag_optional_diags;
 681
 682 /* Nonzero means we should attempt to elide constructors when possible.  */
 683
 684 extern int flag_elide_constructors;
 685
 686 /* Nonzero means that member functions defined in class scope are
 687    inline by default.  */
 688
 689 extern int flag_default_inline;
 690
 691 /* Controls whether compiler generates 'type descriptor' that give
 692    run-time type information.  */
 693
 694 extern int flag_rtti;
 695
 696 /* Nonzero if we want to conserve space in the .o files.  We do this
 697    by putting uninitialized data and runtime initialized data into
 698    .common instead of .data at the expense of not flagging multiple
 699    definitions.  */
 700
 701 extern int flag_conserve_space;
 702
 703 /* Nonzero if we want to obey access control semantics.  */
 704
 705 extern int flag_access_control;
 706
 707 /* Nonzero if we want to check the return value of new and avoid calling
 708    constructors if it is a null pointer.  */
 709
 710 extern int flag_check_new;
 711
 712 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 713    initialization variables.
 714    0: Old rules, set by -fno-for-scope.
 715    2: New ISO rules, set by -ffor-scope.
 716    1: Try to implement new ISO rules, but with backup compatibility
 717    (and warnings).  This is the default, for now.  */
 718
 719 extern int flag_new_for_scope;
 720
 721 /* Nonzero if we want to emit defined symbols with common-like linkage as
 722    weak symbols where possible, in order to conform to C++ semantics.
 723    Otherwise, emit them as local symbols.  */
 724
 725 extern int flag_weak;
 726
 727 /* 0 means we want the preprocessor to not emit line directives for
 728    the current working directory.  1 means we want it to do it.  -1
 729    means we should decide depending on whether debugging information
 730    is being emitted or not.  */
 731
 732 extern int flag_working_directory;
 733
 734 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 735    destructors for local statics and global objects.  */
 736
 737 extern int flag_use_cxa_atexit;
 738
 739 /* Nonzero means make the default pedwarns warnings instead of errors.
 740    The value of this flag is ignored if -pedantic is specified.  */
 741
 742 extern int flag_permissive;
 743
 744 /* Nonzero means to implement standard semantics for exception
 745    specifications, calling unexpected if an exception is thrown that
 746    doesn't match the specification.  Zero means to treat them as
 747    assertions and optimize accordingly, but not check them.  */
 748
 749 extern int flag_enforce_eh_specs;
 750
 751 /* Nonzero means warn about things that will change when compiling
 752    with an ABI-compliant compiler.  */
 753
 754 extern int warn_abi;
 755
 756 /* Nonzero means warn about invalid uses of offsetof.  */
 757
 758 extern int warn_invalid_offsetof;
 759
 760 /* Nonzero means warn about implicit declarations.  */
 761
 762 extern int warn_implicit;
 763
 764 /* Nonzero means warn when all ctors or dtors are private, and the class
 765    has no friends.  */
 766
 767 extern int warn_ctor_dtor_privacy;
 768
 769 /* Nonzero means warn in function declared in derived class has the
 770    same name as a virtual in the base class, but fails to match the
 771    type signature of any virtual function in the base class.  */
 772
 773 extern int warn_overloaded_virtual;
 774
 775 /* Nonzero means warn when declaring a class that has a non virtual
 776    destructor, when it really ought to have a virtual one.  */
 777
 778 extern int warn_nonvdtor;
 779
 780 /* Nonzero means warn when the compiler will reorder code.  */
 781
 782 extern int warn_reorder;
 783
 784 /* Nonzero means warn when synthesis behavior differs from Cfront's.  */
 785
 786 extern int warn_synth;
 787
 788 /* Nonzero means warn when we convert a pointer to member function
 789    into a pointer to (void or function).  */
 790
 791 extern int warn_pmf2ptr;
 792
 793 /* Nonzero means warn about violation of some Effective C++ style rules.  */
 794
 795 extern int warn_ecpp;
 796
 797 /* Nonzero means warn where overload resolution chooses a promotion from
 798    unsigned to signed over a conversion to an unsigned of the same size.  */
 799
 800 extern int warn_sign_promo;
 801
 802 /* Nonzero means warn when an old-style cast is used.  */
 803
 804 extern int warn_old_style_cast;
 805
 806 /* Nonzero means warn when non-templatized friend functions are
 807    declared within a template */
 808
 809 extern int warn_nontemplate_friend;
 810
 811 /* Nonzero means complain about deprecated features.  */
 812
 813 extern int warn_deprecated;
 814
 815 /* Maximum template instantiation depth.  This limit is rather
 816    arbitrary, but it exists to limit the time it takes to notice
 817    infinite template instantiations.  */
 818
 819 extern int max_tinst_depth;
 820
 821 /* Nonzero means the expression being parsed will never be evaluated.
 822    This is a count, since unevaluated expressions can nest.  */
 823
 824 extern int skip_evaluation;
 825
 826 /* C types are partitioned into three subsets: object, function, and
 827    incomplete types.  */
 828 #define C_TYPE_OBJECT_P(type) \
 829   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 830
 831 #define C_TYPE_INCOMPLETE_P(type) \
 832   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 833
 834 #define C_TYPE_FUNCTION_P(type) \
 835   (TREE_CODE (type) == FUNCTION_TYPE)
 836
 837 /* For convenience we define a single macro to identify the class of
 838    object or incomplete types.  */
 839 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 840   (!C_TYPE_FUNCTION_P (type))
 841
 842 /* Record in each node resulting from a binary operator
 843    what operator was specified for it.  */
 844 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 845
 846 /* Attribute table common to the C front ends.  */
 847 extern const struct attribute_spec c_common_attribute_table[];
 848 extern const struct attribute_spec c_common_format_attribute_table[];
 849
 850 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 851    ID is the identifier to use, NAME is the string.
 852    TYPE_DEP indicates whether it depends on type of the function or not
 853    (i.e. __PRETTY_FUNCTION__).  */
 854
 855 extern tree (*make_fname_decl) (tree, int);
 856
 857 extern tree identifier_global_value (tree);
 858 extern void record_builtin_type (enum rid, const char *, tree);
 859 extern tree build_void_list_node (void);
 860 extern void start_fname_decls (void);
 861 extern void finish_fname_decls (void);
 862 extern const char *fname_as_string (int);
 863 extern tree fname_decl (unsigned, tree);
 864
 865 extern void check_function_arguments (tree, tree);
 866 extern void check_function_arguments_recurse (void (*)
 867                                               (void *, tree,
 868                                                unsigned HOST_WIDE_INT),
 869                                               void *, tree,
 870                                               unsigned HOST_WIDE_INT);
 871 extern void check_function_format (int *, tree, tree);
 872 extern void set_Wformat (int);
 873 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 874 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 875 extern int c_common_handle_option (size_t code, const char *arg, int value);
 876 extern bool c_common_missing_argument (const char *opt, size_t code);
 877 extern tree c_common_type_for_mode (enum machine_mode, int);
 878 extern tree c_common_type_for_size (unsigned int, int);
 879 extern tree c_common_unsigned_type (tree);
 880 extern tree c_common_signed_type (tree);
 881 extern tree c_common_signed_or_unsigned_type (int, tree);
 882 extern tree c_common_truthvalue_conversion (tree);
 883 extern void c_apply_type_quals_to_decl (int, tree);
 884 extern tree c_sizeof_or_alignof_type (tree, enum tree_code, int);
 885 extern tree c_alignof_expr (tree);
 886 /* Print an error message for invalid operands to arith operation CODE.
 887    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 888 extern void binary_op_error (enum tree_code);
 889 #define my_friendly_assert(EXP, N) (void) \
 890  (((EXP) == 0) ? (fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0) : 0)
 891
 892 extern tree c_expand_expr_stmt (tree);
 893 extern void c_expand_start_cond (tree, int, tree);
 894 extern void c_finish_then (void);
 895 extern void c_expand_start_else (void);
 896 extern void c_finish_else (void);
 897 extern void c_expand_end_cond (void);
 898 /* Validate the expression after `case' and apply default promotions.  */
 899 extern tree check_case_value (tree);
 900 extern tree fix_string_type (tree);
 901 struct varray_head_tag;
 902 extern void constant_expression_warning (tree);
 903 extern tree convert_and_check (tree, tree);
 904 extern void overflow_warning (tree);
 905 extern void unsigned_conversion_warning (tree, tree);
 906
 907 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 1)
 908 #define c_alignof(T) c_sizeof_or_alignof_type (T, ALIGNOF_EXPR, 1)
 909
 910 /* Subroutine of build_binary_op, used for comparison operations.
 911    See if the operands have both been converted from subword integer types
 912    and, if so, perhaps change them both back to their original type.  */
 913 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 914
 915 extern tree pointer_int_sum (enum tree_code, tree, tree);
 916 extern unsigned int min_precision (tree, int);
 917
 918 /* Add qualifiers to a type, in the fashion for C.  */
 919 extern tree c_build_qualified_type (tree, int);
 920
 921 /* Build tree nodes and builtin functions common to both C and C++ language
 922    frontends.  */
 923 extern void c_common_nodes_and_builtins (void);
 924
 925 extern void disable_builtin_function (const char *);
 926
 927 extern tree build_va_arg (tree, tree);
 928
 929 extern unsigned int c_common_init_options (unsigned int, const char **);
 930 extern bool c_common_post_options (const char **);
 931 extern bool c_common_init (void);
 932 extern void c_common_finish (void);
 933 extern void c_common_parse_file (int);
 934 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 935 extern void c_register_builtin_type (tree, const char*);
 936 extern bool c_promoting_integer_type_p (tree);
 937 extern int self_promoting_args_p (tree);
 938 extern tree strip_array_types (tree);
 939 extern tree strip_pointer_operator (tree);
 940
 941 /* This is the basic parsing function.  */
 942 extern void c_parse_file (void);
 943 /* This is misnamed, it actually performs end-of-compilation processing.  */
 944 extern void finish_file (void);
 945
 946 /* These macros provide convenient access to the various _STMT nodes.  */
 947
 948 /* Nonzero if this statement should be considered a full-expression,
 949    i.e., if temporaries created during this statement should have
 950    their destructors run at the end of this statement.  (In C, this
 951    will always be false, since there are no destructors.)  */
 952 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 953
 954 /* IF_STMT accessors. These give access to the condition of the if
 955    statement, the then block of the if statement, and the else block
 956    of the if statement if it exists.  */
 957 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 958 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 959 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 960
 961 /* WHILE_STMT accessors. These give access to the condition of the
 962    while statement and the body of the while statement, respectively.  */
 963 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 964 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 965
 966 /* DO_STMT accessors. These give access to the condition of the do
 967    statement and the body of the do statement, respectively.  */
 968 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 969 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 970
 971 /* RETURN_STMT accessors. These give the expression associated with a
 972    return statement, and whether it should be ignored when expanding
 973    (as opposed to inlining).  */
 974 #define RETURN_STMT_EXPR(NODE)  TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 975
 976 /* EXPR_STMT accessor. This gives the expression associated with an
 977    expression statement.  */
 978 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 979
 980 /* FOR_STMT accessors. These give access to the init statement,
 981    condition, update expression, and body of the for statement,
 982    respectively.  */
 983 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 984 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 985 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 986 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 987
 988 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
 989 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
 990
 991 /* True for goto created artificially by the compiler.  */
 992 #define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
 993
 994 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
 995    statements associated with a compound statement. The result is the
 996    first statement in the list. Succeeding nodes can be accessed by
 997    calling TREE_CHAIN on a node in the list.  */
 998 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
 999
1000 /* DECL_STMT accessor. This gives access to the DECL associated with
1001    the given declaration statement.  */
1002 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
1003
1004 /* STMT_EXPR accessor.  */
1005 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
1006
1007 /* Nonzero if this statement-expression does not have an associated scope.  */
1008 #define STMT_EXPR_NO_SCOPE(NODE) \
1009    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
1010
1011 /* LABEL_STMT accessor. This gives access to the label associated with
1012    the given label statement.  */
1013 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
1014
1015 /* COMPOUND_LITERAL_EXPR accessors.  */
1016 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
1017   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
1018 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
1019   DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
1020
1021 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
1022 #define SCOPE_BEGIN_P(NODE) \
1023   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
1024
1025 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
1026 #define SCOPE_END_P(NODE) \
1027   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
1028
1029 /* The BLOCK containing the declarations contained in this scope.  */
1030 #define SCOPE_STMT_BLOCK(NODE) \
1031   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
1032
1033 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
1034 #define SCOPE_NULLIFIED_P(NODE) \
1035   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
1036
1037 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
1038    which should be treated as non-existent from the point of view of
1039    running cleanup actions.  */
1040 #define SCOPE_NO_CLEANUPS_P(NODE) \
1041   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
1042
1043 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
1044    For example, in:
1045
1046      S s;
1047      l:
1048      S s2;
1049      goto l;
1050
1051    there is (implicitly) a new scope after `l', even though there are
1052    no curly braces.  In particular, when we hit the goto, we must
1053    destroy s2 and then re-construct it.  For the implicit scope,
1054    SCOPE_PARTIAL_P will be set.  */
1055 #define SCOPE_PARTIAL_P(NODE) \
1056   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
1057
1058 /* The VAR_DECL to clean up in a CLEANUP_STMT.  */
1059 #define CLEANUP_DECL(NODE) \
1060   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
1061 /* The cleanup to run in a CLEANUP_STMT.  */
1062 #define CLEANUP_EXPR(NODE) \
1063   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
1064
1065 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
1066    initialization variables.  */
1067 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
1068
1069 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
1070
1071 enum c_tree_code {
1072   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
1073 #include "c-common.def"
1074   LAST_C_TREE_CODE
1075 };
1076
1077 #undef DEFTREECODE
1078
1079 #define c_common_stmt_codes                             \
1080    CLEANUP_STMT,        EXPR_STMT,      COMPOUND_STMT,  \
1081    DECL_STMT,           IF_STMT,        FOR_STMT,       \
1082    WHILE_STMT,          DO_STMT,        RETURN_STMT,    \
1083    BREAK_STMT,          CONTINUE_STMT,  SCOPE_STMT,     \
1084    SWITCH_STMT,         GOTO_STMT,      LABEL_STMT,     \
1085    ASM_STMT,            CASE_LABEL
1086
1087 /* TRUE if a code represents a statement.  The front end init
1088    langhook should take care of initialization of this array.  */
1089 extern bool statement_code_p[MAX_TREE_CODES];
1090
1091 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
1092
1093 #define INIT_STATEMENT_CODES(STMT_CODES)                        \
1094   do {                                                          \
1095     unsigned int i;                                             \
1096     memset (&statement_code_p, 0, sizeof (statement_code_p));   \
1097     for (i = 0; i < ARRAY_SIZE (STMT_CODES); i++)               \
1098       statement_code_p[STMT_CODES[i]] = true;                   \
1099   } while (0)
1100
1101 extern int stmts_are_full_exprs_p (void);
1102 extern int anon_aggr_type_p (tree);
1103
1104 /* For a VAR_DECL that is an anonymous union, these are the various
1105    sub-variables that make up the anonymous union.  */
1106 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
1107
1108 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
1109 #define DECL_C_BIT_FIELD(NODE) \
1110   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
1111 #define SET_DECL_C_BIT_FIELD(NODE) \
1112   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
1113 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
1114   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
1115
1116 extern void emit_local_var (tree);
1117 extern void make_rtl_for_local_static (tree);
1118 extern tree c_expand_return (tree);
1119 extern tree do_case (tree, tree);
1120 extern tree build_stmt (enum tree_code, ...);
1121 extern tree build_case_label (tree, tree, tree);
1122 extern tree build_continue_stmt (void);
1123 extern tree build_break_stmt (void);
1124 extern tree build_return_stmt (tree);
1125
1126 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
1127
1128 /* Used by the C++ frontend to mark the block around the member
1129    initializers and cleanups.  */
1130 #define COMPOUND_STMT_BODY_BLOCK(NODE)  TREE_LANG_FLAG_3 (NODE)
1131
1132 extern void c_expand_asm_operands (tree, tree, tree, tree, int, location_t);
1133
1134 /* These functions must be defined by each front-end which implements
1135    a variant of the C language.  They are used in c-common.c.  */
1136
1137 extern tree build_unary_op (enum tree_code, tree, int);
1138 extern tree build_binary_op (enum tree_code, tree, tree, int);
1139 extern int lvalue_p (tree);
1140 extern tree default_conversion (tree);
1141
1142 /* Given two integer or real types, return the type for their sum.
1143    Given two compatible ANSI C types, returns the merged type.  */
1144
1145 extern tree common_type (tree, tree);
1146
1147 extern tree expand_tree_builtin (tree, tree, tree);
1148
1149 extern tree decl_constant_value (tree);
1150
1151 /* Handle increment and decrement of boolean types.  */
1152 extern tree boolean_increment (enum tree_code, tree);
1153
1154 /* Hook currently used only by the C++ front end to reset internal state
1155    after entering or leaving a header file.  */
1156 extern void extract_interface_info (void);
1157
1158 extern int case_compare (splay_tree_key, splay_tree_key);
1159
1160 extern tree c_add_case_label (splay_tree, tree, tree, tree);
1161
1162 extern void c_do_switch_warnings (splay_tree, tree);
1163
1164 extern tree build_function_call (tree, tree);
1165
1166 extern tree finish_label_address_expr (tree);
1167
1168 /* Same function prototype, but the C and C++ front ends have
1169    different implementations.  Used in c-common.c.  */
1170 extern tree lookup_label (tree);
1171
1172 extern int vector_types_convertible_p (tree t1, tree t2);
1173
1174 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
1175
1176 extern int c_safe_from_p (rtx, tree);
1177
1178 extern int c_staticp (tree);
1179
1180 extern int c_common_unsafe_for_reeval (tree);
1181
1182 extern void init_c_lex (void);
1183
1184 extern void c_cpp_builtins (cpp_reader *);
1185
1186 /* Positive if an implicit `extern "C"' scope has just been entered;
1187    negative if such a scope has just been exited.  */
1188 extern GTY(()) int pending_lang_change;
1189
1190 /* Information recorded about each file examined during compilation.  */
1191
1192 struct c_fileinfo
1193 {
1194   int time;     /* Time spent in the file.  */
1195   short interface_only;         /* Flags - used only by C++ */
1196   short interface_unknown;
1197 };
1198
1199 struct c_fileinfo *get_fileinfo (const char *);
1200 extern void dump_time_statistics (void);
1201
1202 extern bool c_dump_tree (void *, tree);
1203
1204 extern int c_gimplify_expr (tree *, tree *, tree *);
1205 extern tree c_walk_subtrees (tree*, int*, walk_tree_fn, void*, void*);
1206 extern int c_tree_chain_matters_p (tree);
1207
1208 extern void c_warn_unused_result (tree *);
1209
1210 /* In c-simplify.c  */
1211 extern void c_genericize (tree);
1212 extern int c_gimplify_stmt (tree *);
1213 extern tree stmt_expr_last_stmt (tree);
1214
1215 extern void pch_init (void);
1216 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1217 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1218                                const char *orig);
1219 extern void c_common_write_pch (void);
1220 extern void c_common_no_more_pch (void);
1221 extern void builtin_define_with_value (const char *, const char *, int);
1222 extern void c_stddef_cpp_builtins (void);
1223 extern void fe_file_change (const struct line_map *);
1224 extern int c_estimate_num_insns (tree decl);
1225 extern void c_parse_error (const char *, enum cpp_ttype, tree);
1226
1227 /* The following have been moved here from c-tree.h, since they're needed
1228    in the ObjC++ world, too.  What is more, stub-objc.c could use a few
1229    prototypes.  */
1230 extern tree lookup_interface (tree);
1231 extern tree is_class_name (tree);
1232 extern tree objc_is_object_ptr (tree);
1233 extern void objc_check_decl (tree);
1234 extern int objc_comptypes (tree, tree, int);
1235 extern tree objc_message_selector (void);
1236 extern tree lookup_objc_ivar (tree);
1237 extern void *get_current_scope (void);
1238 extern void objc_mark_locals_volatile (void *);
1239
1240 /* In c-ppoutput.c  */
1241 extern void init_pp_output (FILE *);
1242 extern void preprocess_file (cpp_reader *);
1243 extern void pp_file_change (const struct line_map *);
1244 extern void pp_dir_change (cpp_reader *, const char *);
1245
1246 #endif /* ! GCC_C_COMMON_H */