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, 2005 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: TREE_NEGATED_INT (in INTEGER_CST).
  31       IDENTIFIER_MARKED (used by search routines).
  32       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  33       STMT_EXPR_NO_SCOPE (in STMT_EXPR)
  34    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  35       STMT_IS_FULL_EXPR_P (in _STMT)
  36       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  37    2: unused
  38    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  39    4: unused
  40 */
  41
  42 /* Reserved identifiers.  This is the union of all the keywords for C,
  43    C++, and Objective-C.  All the type modifiers have to be in one
  44    block at the beginning, because they are used as mask bits.  There
  45    are 27 type modifiers; if we add many more we will have to redesign
  46    the mask mechanism.  */
  47
  48 enum rid
  49 {
  50   /* Modifiers: */
  51   /* C, in empirical order of frequency.  */
  52   RID_STATIC = 0,
  53   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  54   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  55   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  56
  57   /* C extensions */
  58   RID_COMPLEX, RID_THREAD,
  59
  60   /* C++ */
  61   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  62
  63   /* ObjC */
  64   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  65
  66   /* C */
  67   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  68   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  69   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  70   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  71   RID_SIZEOF,
  72
  73   /* C extensions */
  74   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  75   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
  76   RID_TYPES_COMPATIBLE_P,
  77
  78   /* Too many ways of getting the name of a function as a string */
  79   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  80
  81   /* C++ */
  82   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  83   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  84   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  85   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  86   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  87   RID_THIS,     RID_THROW,    RID_TRUE,
  88   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  89   RID_USING,
  90
  91   /* casts */
  92   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  93
  94   /* Objective-C */
  95   RID_AT_ENCODE,   RID_AT_END,
  96   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  97   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
  98   RID_AT_PROTOCOL, RID_AT_SELECTOR,
  99   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 100   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 101   RID_AT_INTERFACE,
 102   RID_AT_IMPLEMENTATION,
 103
 104   RID_MAX,
 105
 106   RID_FIRST_MODIFIER = RID_STATIC,
 107   RID_LAST_MODIFIER = RID_ONEWAY,
 108
 109   RID_FIRST_AT = RID_AT_ENCODE,
 110   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 111   RID_FIRST_PQ = RID_IN,
 112   RID_LAST_PQ = RID_ONEWAY
 113 };
 114
 115 #define OBJC_IS_AT_KEYWORD(rid) \
 116   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 117    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 118
 119 #define OBJC_IS_PQ_KEYWORD(rid) \
 120   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 121    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 122
 123 /* The elements of `ridpointers' are identifier nodes for the reserved
 124    type names and storage classes.  It is indexed by a RID_... value.  */
 125 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 126
 127 /* Standard named or nameless data types of the C compiler.  */
 128
 129 enum c_tree_index
 130 {
 131     CTI_WCHAR_TYPE,
 132     CTI_SIGNED_WCHAR_TYPE,
 133     CTI_UNSIGNED_WCHAR_TYPE,
 134     CTI_WINT_TYPE,
 135     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 136     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 137     CTI_INTMAX_TYPE,
 138     CTI_UINTMAX_TYPE,
 139     CTI_WIDEST_INT_LIT_TYPE,
 140     CTI_WIDEST_UINT_LIT_TYPE,
 141
 142     CTI_CHAR_ARRAY_TYPE,
 143     CTI_WCHAR_ARRAY_TYPE,
 144     CTI_INT_ARRAY_TYPE,
 145     CTI_STRING_TYPE,
 146     CTI_CONST_STRING_TYPE,
 147
 148     /* Type for boolean expressions (bool in C++, int in C).  */
 149     CTI_TRUTHVALUE_TYPE,
 150     CTI_TRUTHVALUE_TRUE,
 151     CTI_TRUTHVALUE_FALSE,
 152
 153     CTI_DEFAULT_FUNCTION_TYPE,
 154
 155     /* These are not types, but we have to look them up all the time.  */
 156     CTI_FUNCTION_NAME_DECL,
 157     CTI_PRETTY_FUNCTION_NAME_DECL,
 158     CTI_C99_FUNCTION_NAME_DECL,
 159     CTI_SAVED_FUNCTION_NAME_DECLS,
 160
 161     CTI_VOID_ZERO,
 162
 163     CTI_MAX
 164 };
 165
 166 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 167
 168 /* Identifier part common to the C front ends.  Inherits from
 169    tree_identifier, despite appearances.  */
 170 struct c_common_identifier GTY(())
 171 {
 172   struct tree_common common;
 173   struct cpp_hashnode node;
 174 };
 175
 176 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 177 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 178 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 179 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 180 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 181 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 182 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 183 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 184 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 185 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 186
 187 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 188 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 189 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 190
 191 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 192 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 193 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 194 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 195 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 196
 197 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 198
 199 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 200 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 201 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 202 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 203
 204 /* A node for `((void) 0)'.  */
 205 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 206
 207 extern GTY(()) tree c_global_trees[CTI_MAX];
 208
 209 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 210    tree for size reasons.  */
 211 struct sorted_fields_type GTY(())
 212 {
 213   int len;
 214   tree GTY((length ("%h.len"))) elts[1];
 215 };
 216
 217 /* Mark which labels are explicitly declared.
 218    These may be shadowed, and may be referenced from nested functions.  */
 219 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 220
 221 typedef enum c_language_kind
 222 {
 223   clk_c         = 0,            /* C90, C94 or C99 */
 224   clk_objc      = 1,            /* clk_c with ObjC features.  */
 225   clk_cxx       = 2,            /* ANSI/ISO C++ */
 226   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 227 }
 228 c_language_kind;
 229
 230 /* To test for a specific language use c_language, defined by each
 231    front end.  For "ObjC features" or "not C++" use the macros.  */
 232 extern c_language_kind c_language;
 233
 234 #define c_dialect_cxx()         (c_language & clk_cxx)
 235 #define c_dialect_objc()        (c_language & clk_objc)
 236
 237 /* Information about a statement tree.  */
 238
 239 struct stmt_tree_s GTY(()) {
 240   /* The current statement list being collected.  */
 241   tree x_cur_stmt_list;
 242
 243   /* In C++, Nonzero if we should treat statements as full
 244      expressions.  In particular, this variable is no-zero if at the
 245      end of a statement we should destroy any temporaries created
 246      during that statement.  Similarly, if, at the end of a block, we
 247      should destroy any local variables in this block.  Normally, this
 248      variable is nonzero, since those are the normal semantics of
 249      C++.
 250
 251      However, in order to represent aggregate initialization code as
 252      tree structure, we use statement-expressions.  The statements
 253      within the statement expression should not result in cleanups
 254      being run until the entire enclosing statement is complete.
 255
 256      This flag has no effect in C.  */
 257   int stmts_are_full_exprs_p;
 258 };
 259
 260 typedef struct stmt_tree_s *stmt_tree;
 261
 262 /* Global state pertinent to the current function.  Some C dialects
 263    extend this structure with additional fields.  */
 264
 265 struct c_language_function GTY(()) {
 266   /* While we are parsing the function, this contains information
 267      about the statement-tree that we are building.  */
 268   struct stmt_tree_s x_stmt_tree;
 269 };
 270
 271 /* When building a statement-tree, this is the current statement list
 272    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 273    statement list.  */
 274
 275 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 276
 277 /* Language-specific hooks.  */
 278
 279 /* Callback that determines if it's ok for a function to have no
 280    noreturn attribute.  */
 281 extern int (*lang_missing_noreturn_ok_p) (tree);
 282
 283 /* If non-NULL, this function is called after a precompile header file
 284    is loaded.  */
 285 extern void (*lang_post_pch_load) (void);
 286
 287 extern void push_file_scope (void);
 288 extern void pop_file_scope (void);
 289 extern int yyparse (void);
 290 extern stmt_tree current_stmt_tree (void);
 291 extern tree push_stmt_list (void);
 292 extern tree pop_stmt_list (tree);
 293 extern tree add_stmt (tree);
 294 extern void push_cleanup (tree, tree, bool);
 295
 296 extern int c_expand_decl (tree);
 297
 298 extern int field_decl_cmp (const void *, const void *);
 299 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 300                                   void *);
 301 extern bool has_c_linkage (tree decl);
 302 \f
 303 /* Switches common to the C front ends.  */
 304
 305 /* Nonzero if prepreprocessing only.  */
 306
 307 extern int flag_preprocess_only;
 308
 309 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 310    calls will be used in ObjC; passing nil receivers to such calls
 311    will most likely result in crashes.  */
 312 extern int flag_nil_receivers;
 313
 314 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 315    @try, etc.) in source code.  */
 316 extern int flag_objc_exceptions;
 317
 318 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 319 extern int flag_objc_sjlj_exceptions;
 320
 321 /* Nonzero means that code generation will be altered to support
 322    "zero-link" execution.  This currently affects ObjC only, but may
 323    affect other languages in the future.  */
 324 extern int flag_zero_link;
 325
 326 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 327    unit.  It will inform the ObjC runtime that class definition(s) herein
 328    contained are to replace one(s) previously loaded.  */
 329 extern int flag_replace_objc_classes;
 330
 331 /* Nonzero means don't output line number information.  */
 332
 333 extern char flag_no_line_commands;
 334
 335 /* Nonzero causes -E output not to be done, but directives such as
 336    #define that have side effects are still obeyed.  */
 337
 338 extern char flag_no_output;
 339
 340 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 341    'N' of the command line switch.  */
 342
 343 extern char flag_dump_macros;
 344
 345 /* Nonzero means pass #include lines through to the output.  */
 346
 347 extern char flag_dump_includes;
 348
 349 /* Nonzero means process PCH files while preprocessing.  */
 350
 351 extern bool flag_pch_preprocess;
 352
 353 /* The file name to which we should write a precompiled header, or
 354    NULL if no header will be written in this compile.  */
 355
 356 extern const char *pch_file;
 357
 358 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 359    user's namespace.  */
 360
 361 extern int flag_iso;
 362
 363 /* Nonzero if -undef was given.  It suppresses target built-in macros
 364    and assertions.  */
 365
 366 extern int flag_undef;
 367
 368 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 369
 370 extern int flag_no_builtin;
 371
 372 /* Nonzero means don't recognize the non-ANSI builtin functions.
 373    -ansi sets this.  */
 374
 375 extern int flag_no_nonansi_builtin;
 376
 377 /* Nonzero means give `double' the same size as `float'.  */
 378
 379 extern int flag_short_double;
 380
 381 /* Nonzero means give `wchar_t' the same size as `short'.  */
 382
 383 extern int flag_short_wchar;
 384
 385 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 386 extern int flag_ms_extensions;
 387
 388 /* Nonzero means don't recognize the keyword `asm'.  */
 389
 390 extern int flag_no_asm;
 391
 392 /* Nonzero means give string constants the type `const char *', as mandated
 393    by the standard.  */
 394
 395 extern int flag_const_strings;
 396
 397 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 398
 399 extern int flag_signed_bitfields;
 400
 401 /* Nonzero means warn about deprecated conversion from string constant to
 402    `char *'.  */
 403
 404 extern int warn_write_strings;
 405
 406 /* Warn about #pragma directives that are not recognized.  */
 407
 408 extern int warn_unknown_pragmas; /* Tri state variable.  */
 409
 410 /* Warn about format/argument anomalies in calls to formatted I/O functions
 411    (*printf, *scanf, strftime, strfmon, etc.).  */
 412
 413 extern int warn_format;
 414
 415
 416 /* C/ObjC language option variables.  */
 417
 418
 419 /* Nonzero means allow type mismatches in conditional expressions;
 420    just make their values `void'.  */
 421
 422 extern int flag_cond_mismatch;
 423
 424 /* Nonzero means enable C89 Amendment 1 features.  */
 425
 426 extern int flag_isoc94;
 427
 428 /* Nonzero means use the ISO C99 dialect of C.  */
 429
 430 extern int flag_isoc99;
 431
 432 /* Nonzero means that we have builtin functions, and main is an int.  */
 433
 434 extern int flag_hosted;
 435
 436 /* Warn if main is suspicious.  */
 437
 438 extern int warn_main;
 439
 440
 441 /* ObjC language option variables.  */
 442
 443
 444 /* Open and close the file for outputting class declarations, if
 445    requested (ObjC).  */
 446
 447 extern int flag_gen_declaration;
 448
 449 /* Generate code for GNU or NeXT runtime environment.  */
 450
 451 extern int flag_next_runtime;
 452
 453 /* Tells the compiler that this is a special run.  Do not perform any
 454    compiling, instead we are to test some platform dependent features
 455    and output a C header file with appropriate definitions.  */
 456
 457 extern int print_struct_values;
 458
 459 /* ???.  Undocumented.  */
 460
 461 extern const char *constant_string_class_name;
 462
 463
 464 /* C++ language option variables.  */
 465
 466
 467 /* Nonzero means don't recognize any extension keywords.  */
 468
 469 extern int flag_no_gnu_keywords;
 470
 471 /* Nonzero means do emit exported implementations of functions even if
 472    they can be inlined.  */
 473
 474 extern int flag_implement_inlines;
 475
 476 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 477
 478 extern int flag_implicit_templates;
 479
 480 /* Nonzero means that implicit instantiations of inline templates will be
 481    emitted if needed, even if instantiations of non-inline templates
 482    aren't.  */
 483
 484 extern int flag_implicit_inline_templates;
 485
 486 /* Nonzero means generate separate instantiation control files and
 487    juggle them at link time.  */
 488
 489 extern int flag_use_repository;
 490
 491 /* Nonzero if we want to issue diagnostics that the standard says are not
 492    required.  */
 493
 494 extern int flag_optional_diags;
 495
 496 /* Nonzero means we should attempt to elide constructors when possible.  */
 497
 498 extern int flag_elide_constructors;
 499
 500 /* Nonzero means that member functions defined in class scope are
 501    inline by default.  */
 502
 503 extern int flag_default_inline;
 504
 505 /* Controls whether compiler generates 'type descriptor' that give
 506    run-time type information.  */
 507
 508 extern int flag_rtti;
 509
 510 /* Nonzero if we want to conserve space in the .o files.  We do this
 511    by putting uninitialized data and runtime initialized data into
 512    .common instead of .data at the expense of not flagging multiple
 513    definitions.  */
 514
 515 extern int flag_conserve_space;
 516
 517 /* Nonzero if we want to obey access control semantics.  */
 518
 519 extern int flag_access_control;
 520
 521 /* Nonzero if we want to check the return value of new and avoid calling
 522    constructors if it is a null pointer.  */
 523
 524 extern int flag_check_new;
 525
 526 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 527    initialization variables.
 528    0: Old rules, set by -fno-for-scope.
 529    2: New ISO rules, set by -ffor-scope.
 530    1: Try to implement new ISO rules, but with backup compatibility
 531    (and warnings).  This is the default, for now.  */
 532
 533 extern int flag_new_for_scope;
 534
 535 /* Nonzero if we want to emit defined symbols with common-like linkage as
 536    weak symbols where possible, in order to conform to C++ semantics.
 537    Otherwise, emit them as local symbols.  */
 538
 539 extern int flag_weak;
 540
 541 /* 0 means we want the preprocessor to not emit line directives for
 542    the current working directory.  1 means we want it to do it.  -1
 543    means we should decide depending on whether debugging information
 544    is being emitted or not.  */
 545
 546 extern int flag_working_directory;
 547
 548 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 549    destructors for local statics and global objects.  */
 550
 551 extern int flag_use_cxa_atexit;
 552
 553 /* Nonzero means make the default pedwarns warnings instead of errors.
 554    The value of this flag is ignored if -pedantic is specified.  */
 555
 556 extern int flag_permissive;
 557
 558 /* Nonzero means to implement standard semantics for exception
 559    specifications, calling unexpected if an exception is thrown that
 560    doesn't match the specification.  Zero means to treat them as
 561    assertions and optimize accordingly, but not check them.  */
 562
 563 extern int flag_enforce_eh_specs;
 564
 565 /* Nonzero (the default) means to generate thread-safe code for
 566    initializing local statics.  */
 567
 568 extern int flag_threadsafe_statics;
 569
 570 /* Nonzero means warn about implicit declarations.  */
 571
 572 extern int warn_implicit;
 573
 574 /* Maximum template instantiation depth.  This limit is rather
 575    arbitrary, but it exists to limit the time it takes to notice
 576    infinite template instantiations.  */
 577
 578 extern int max_tinst_depth;
 579
 580 /* Nonzero means the expression being parsed will never be evaluated.
 581    This is a count, since unevaluated expressions can nest.  */
 582
 583 extern int skip_evaluation;
 584
 585 /* C types are partitioned into three subsets: object, function, and
 586    incomplete types.  */
 587 #define C_TYPE_OBJECT_P(type) \
 588   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 589
 590 #define C_TYPE_INCOMPLETE_P(type) \
 591   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 592
 593 #define C_TYPE_FUNCTION_P(type) \
 594   (TREE_CODE (type) == FUNCTION_TYPE)
 595
 596 /* For convenience we define a single macro to identify the class of
 597    object or incomplete types.  */
 598 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 599   (!C_TYPE_FUNCTION_P (type))
 600
 601 /* Attribute table common to the C front ends.  */
 602 extern const struct attribute_spec c_common_attribute_table[];
 603 extern const struct attribute_spec c_common_format_attribute_table[];
 604
 605 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 606    ID is the identifier to use, NAME is the string.
 607    TYPE_DEP indicates whether it depends on type of the function or not
 608    (i.e. __PRETTY_FUNCTION__).  */
 609
 610 extern tree (*make_fname_decl) (tree, int);
 611
 612 extern tree identifier_global_value (tree);
 613 extern void record_builtin_type (enum rid, const char *, tree);
 614 extern tree build_void_list_node (void);
 615 extern void start_fname_decls (void);
 616 extern void finish_fname_decls (void);
 617 extern const char *fname_as_string (int);
 618 extern tree fname_decl (unsigned, tree);
 619
 620 extern void check_function_arguments (tree, tree);
 621 extern void check_function_arguments_recurse (void (*)
 622                                               (void *, tree,
 623                                                unsigned HOST_WIDE_INT),
 624                                               void *, tree,
 625                                               unsigned HOST_WIDE_INT);
 626 extern void check_function_format (tree, tree);
 627 extern void set_Wformat (int);
 628 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 629 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 630 extern int c_common_handle_option (size_t code, const char *arg, int value);
 631 extern bool c_common_missing_argument (const char *opt, size_t code);
 632 extern tree c_common_type_for_mode (enum machine_mode, int);
 633 extern tree c_common_type_for_size (unsigned int, int);
 634 extern tree c_common_unsigned_type (tree);
 635 extern tree c_common_signed_type (tree);
 636 extern tree c_common_signed_or_unsigned_type (int, tree);
 637 extern tree c_common_truthvalue_conversion (tree);
 638 extern void c_apply_type_quals_to_decl (int, tree);
 639 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 640 extern tree c_alignof_expr (tree);
 641 /* Print an error message for invalid operands to arith operation CODE.
 642    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 643 extern void binary_op_error (enum tree_code);
 644 extern tree fix_string_type (tree);
 645 struct varray_head_tag;
 646 extern void constant_expression_warning (tree);
 647 extern tree convert_and_check (tree, tree);
 648 extern void overflow_warning (tree);
 649 extern void unsigned_conversion_warning (tree, tree);
 650 extern bool c_determine_visibility (tree);
 651
 652 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 653 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 654
 655 /* Subroutine of build_binary_op, used for comparison operations.
 656    See if the operands have both been converted from subword integer types
 657    and, if so, perhaps change them both back to their original type.  */
 658 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 659
 660 extern tree pointer_int_sum (enum tree_code, tree, tree);
 661 extern unsigned int min_precision (tree, int);
 662
 663 /* Add qualifiers to a type, in the fashion for C.  */
 664 extern tree c_build_qualified_type (tree, int);
 665
 666 /* Build tree nodes and builtin functions common to both C and C++ language
 667    frontends.  */
 668 extern void c_common_nodes_and_builtins (void);
 669
 670 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 671
 672 extern void disable_builtin_function (const char *);
 673
 674 extern tree build_va_arg (tree, tree);
 675
 676 extern unsigned int c_common_init_options (unsigned int, const char **);
 677 extern bool c_common_post_options (const char **);
 678 extern bool c_common_init (void);
 679 extern void c_common_finish (void);
 680 extern void c_common_parse_file (int);
 681 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 682 extern void c_register_builtin_type (tree, const char*);
 683 extern bool c_promoting_integer_type_p (tree);
 684 extern int self_promoting_args_p (tree);
 685 extern tree strip_array_types (tree);
 686 extern tree strip_pointer_operator (tree);
 687 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 688
 689 /* This is the basic parsing function.  */
 690 extern void c_parse_file (void);
 691 /* This is misnamed, it actually performs end-of-compilation processing.  */
 692 extern void finish_file (void);
 693
 694
 695 /* These macros provide convenient access to the various _STMT nodes.  */
 696
 697 /* Nonzero if this statement should be considered a full-expression,
 698    i.e., if temporaries created during this statement should have
 699    their destructors run at the end of this statement.  (In C, this
 700    will always be false, since there are no destructors.)  */
 701 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 702
 703 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 704    if a statement expression.  */
 705 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 706   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 707
 708 /* Nonzero if a label has been added to the statement list.  */
 709 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 710   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 711
 712 /* EXPR_STMT accessor. This gives the expression associated with an
 713    expression statement.  */
 714 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 715
 716 /* STMT_EXPR accessor.  */
 717 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 718
 719 /* Nonzero if this statement-expression does not have an associated scope.  */
 720 #define STMT_EXPR_NO_SCOPE(NODE) \
 721    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
 722
 723 /* COMPOUND_LITERAL_EXPR accessors.  */
 724 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 725   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 726 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 727   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 728
 729 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 730
 731 enum c_tree_code {
 732   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 733 #include "c-common.def"
 734   LAST_C_TREE_CODE
 735 };
 736
 737 #undef DEFTREECODE
 738
 739 #define c_common_stmt_codes                             \
 740    EXPR_STMT
 741
 742 /* TRUE if a code represents a statement.  The front end init
 743    langhook should take care of initialization of this array.  */
 744 extern bool statement_code_p[MAX_TREE_CODES];
 745
 746 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
 747
 748 #define INIT_STATEMENT_CODES(STMT_CODES)                        \
 749   do {                                                          \
 750     unsigned int i;                                             \
 751     memset (&statement_code_p, 0, sizeof (statement_code_p));   \
 752     for (i = 0; i < ARRAY_SIZE (STMT_CODES); i++)               \
 753       statement_code_p[STMT_CODES[i]] = true;                   \
 754   } while (0)
 755
 756 extern int stmts_are_full_exprs_p (void);
 757 extern int anon_aggr_type_p (tree);
 758
 759 /* For a VAR_DECL that is an anonymous union, these are the various
 760    sub-variables that make up the anonymous union.  */
 761 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 762
 763 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 764 #define DECL_C_BIT_FIELD(NODE) \
 765   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 766 #define SET_DECL_C_BIT_FIELD(NODE) \
 767   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 768 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 769   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 770
 771 extern void emit_local_var (tree);
 772 extern tree do_case (tree, tree);
 773 extern tree build_stmt (enum tree_code, ...);
 774 extern tree build_case_label (tree, tree, tree);
 775
 776 /* These functions must be defined by each front-end which implements
 777    a variant of the C language.  They are used in c-common.c.  */
 778
 779 extern tree build_unary_op (enum tree_code, tree, int);
 780 extern tree build_binary_op (enum tree_code, tree, tree, int);
 781 extern tree perform_integral_promotions (tree);
 782
 783 /* Given two integer or real types, return the type for their sum.
 784    Given two compatible ANSI C types, returns the merged type.  */
 785
 786 extern tree common_type (tree, tree);
 787
 788 extern tree decl_constant_value (tree);
 789
 790 /* Handle increment and decrement of boolean types.  */
 791 extern tree boolean_increment (enum tree_code, tree);
 792
 793 extern int case_compare (splay_tree_key, splay_tree_key);
 794
 795 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 796
 797 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 798
 799 extern tree build_function_call (tree, tree);
 800
 801 extern tree resolve_overloaded_builtin (tree, tree);
 802
 803 extern tree finish_label_address_expr (tree);
 804
 805 /* Same function prototype, but the C and C++ front ends have
 806    different implementations.  Used in c-common.c.  */
 807 extern tree lookup_label (tree);
 808
 809 extern int vector_types_convertible_p (tree t1, tree t2);
 810
 811 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 812
 813 extern tree c_staticp (tree);
 814
 815 extern void init_c_lex (void);
 816
 817 extern void c_cpp_builtins (cpp_reader *);
 818
 819 /* Positive if an implicit `extern "C"' scope has just been entered;
 820    negative if such a scope has just been exited.  */
 821 extern GTY(()) int pending_lang_change;
 822
 823 /* Information recorded about each file examined during compilation.  */
 824
 825 struct c_fileinfo
 826 {
 827   int time;     /* Time spent in the file.  */
 828
 829   /* Flags used only by C++.
 830      INTERFACE_ONLY nonzero means that we are in an "interface" section
 831      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 832      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 833      INTERFACE_ONLY is zero, it means that we are responsible for
 834      exporting definitions that others might need.  */
 835   short interface_only;
 836   short interface_unknown;
 837 };
 838
 839 struct c_fileinfo *get_fileinfo (const char *);
 840 extern void dump_time_statistics (void);
 841
 842 extern bool c_dump_tree (void *, tree);
 843
 844 extern void c_warn_unused_result (tree *);
 845
 846 extern void verify_sequence_points (tree);
 847
 848 extern tree fold_offsetof (tree);
 849
 850 /* Places where an lvalue, or modifiable lvalue, may be required.
 851    Used to select diagnostic messages in lvalue_error and
 852    readonly_error.  */
 853 enum lvalue_use {
 854   lv_assign,
 855   lv_increment,
 856   lv_decrement,
 857   lv_addressof,
 858   lv_asm
 859 };
 860
 861 extern void lvalue_error (enum lvalue_use);
 862
 863 extern int complete_array_type (tree *, tree, bool);
 864
 865 extern tree builtin_type_for_size (int, bool);
 866
 867 /* In c-gimplify.c  */
 868 extern void c_genericize (tree);
 869 extern int c_gimplify_expr (tree *, tree *, tree *);
 870 extern tree c_build_bind_expr (tree, tree);
 871
 872 /* In c-pch.c  */
 873 extern void pch_init (void);
 874 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 875 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 876                                const char *orig);
 877 extern void c_common_write_pch (void);
 878 extern void c_common_no_more_pch (void);
 879 extern void c_common_pch_pragma (cpp_reader *pfile);
 880
 881 extern void builtin_define_with_value (const char *, const char *, int);
 882 extern void c_stddef_cpp_builtins (void);
 883 extern void fe_file_change (const struct line_map *);
 884 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 885
 886 /* Objective-C / Objective-C++ entry points.  */
 887
 888 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 889    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 890 extern tree objc_is_class_name (tree);
 891 extern tree objc_is_object_ptr (tree);
 892 extern void objc_check_decl (tree);
 893 extern int objc_is_reserved_word (tree);
 894 extern int objc_comptypes (tree, tree, int);
 895 extern tree objc_message_selector (void);
 896 extern tree objc_lookup_ivar (tree, tree);
 897 extern void objc_clear_super_receiver (void);
 898 extern int objc_is_public (tree, tree);
 899 extern tree objc_is_id (tree);
 900 extern void objc_declare_alias (tree, tree);
 901 extern void objc_declare_class (tree);
 902 extern void objc_declare_protocols (tree);
 903 extern tree objc_build_message_expr (tree);
 904 extern tree objc_finish_message_expr (tree, tree, tree);
 905 extern tree objc_build_selector_expr (tree);
 906 extern tree objc_build_protocol_expr (tree);
 907 extern tree objc_build_encode_expr (tree);
 908 extern tree objc_build_string_object (tree);
 909 extern tree objc_get_protocol_qualified_type (tree, tree);
 910 extern tree objc_get_class_reference (tree);
 911 extern tree objc_get_class_ivars (tree);
 912 extern void objc_start_class_interface (tree, tree, tree);
 913 extern void objc_start_category_interface (tree, tree, tree);
 914 extern void objc_start_protocol (tree, tree);
 915 extern void objc_continue_interface (void);
 916 extern void objc_finish_interface (void);
 917 extern void objc_start_class_implementation (tree, tree);
 918 extern void objc_start_category_implementation (tree, tree);
 919 extern void objc_continue_implementation (void);
 920 extern void objc_finish_implementation (void);
 921 extern void objc_set_visibility (int);
 922 extern void objc_set_method_type (enum tree_code);
 923 extern tree objc_build_method_signature (tree, tree, tree);
 924 extern void objc_add_method_declaration (tree);
 925 extern void objc_start_method_definition (tree);
 926 extern void objc_finish_method_definition (tree);
 927 extern void objc_add_instance_variable (tree);
 928 extern tree objc_build_keyword_decl (tree, tree, tree);
 929 extern tree objc_build_throw_stmt (tree);
 930 extern void objc_begin_try_stmt (location_t, tree);
 931 extern void objc_finish_try_stmt (void);
 932 extern void objc_begin_catch_clause (tree);
 933 extern void objc_finish_catch_clause (void);
 934 extern void objc_build_finally_clause (location_t, tree);
 935 extern void objc_build_synchronized (location_t, tree, tree);
 936 extern int objc_static_init_needed_p (void);
 937 extern tree objc_generate_static_init_call (tree);
 938
 939 /* The following are provided by the C and C++ front-ends, and called by
 940    ObjC/ObjC++.  */
 941 extern void *objc_get_current_scope (void);
 942 extern void objc_mark_locals_volatile (void *);
 943
 944 /* In c-ppoutput.c  */
 945 extern void init_pp_output (FILE *);
 946 extern void preprocess_file (cpp_reader *);
 947 extern void pp_file_change (const struct line_map *);
 948 extern void pp_dir_change (cpp_reader *, const char *);
 949
 950 #endif /* ! GCC_C_COMMON_H */