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, 2007 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_C_COMMON_H
  22 #define GCC_C_COMMON_H
  23
  24 #include "splay-tree.h"
  25 #include "cpplib.h"
  26 #include "ggc.h"
  27
  28 /* Usage of TREE_LANG_FLAG_?:
  29    0: TREE_NEGATED_INT (in INTEGER_CST).
  30       IDENTIFIER_MARKED (used by search routines).
  31       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  32    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  33       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  34    2: unused
  35    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  36    4: unused
  37 */
  38
  39 /* Reserved identifiers.  This is the union of all the keywords for C,
  40    C++, and Objective-C.  All the type modifiers have to be in one
  41    block at the beginning, because they are used as mask bits.  There
  42    are 27 type modifiers; if we add many more we will have to redesign
  43    the mask mechanism.  */
  44
  45 enum rid
  46 {
  47   /* Modifiers: */
  48   /* C, in empirical order of frequency.  */
  49   RID_STATIC = 0,
  50   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  51   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  52   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  53
  54   /* C extensions */
  55   RID_COMPLEX, RID_THREAD,
  56
  57   /* C++ */
  58   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  59
  60   /* ObjC */
  61   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  62
  63   /* C */
  64   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  65   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  66   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  67   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  68   RID_SIZEOF,
  69
  70   /* C extensions */
  71   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  72   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
  73   RID_TYPES_COMPATIBLE_P,
  74   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
  75
  76   /* Too many ways of getting the name of a function as a string */
  77   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  78
  79   /* C++ */
  80   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  81   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  82   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  83   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  84   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  85   RID_THIS,     RID_THROW,    RID_TRUE,
  86   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  87   RID_USING,
  88
  89   /* casts */
  90   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  91
  92   /* Objective-C */
  93   RID_AT_ENCODE,   RID_AT_END,
  94   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  95   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
  96   RID_AT_PROTOCOL, RID_AT_SELECTOR,
  97   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
  98   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
  99   RID_AT_INTERFACE,
 100   RID_AT_IMPLEMENTATION,
 101
 102   RID_MAX,
 103
 104   RID_FIRST_MODIFIER = RID_STATIC,
 105   RID_LAST_MODIFIER = RID_ONEWAY,
 106
 107   RID_FIRST_AT = RID_AT_ENCODE,
 108   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 109   RID_FIRST_PQ = RID_IN,
 110   RID_LAST_PQ = RID_ONEWAY
 111 };
 112
 113 #define OBJC_IS_AT_KEYWORD(rid) \
 114   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 115    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 116
 117 #define OBJC_IS_PQ_KEYWORD(rid) \
 118   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 119    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 120
 121 /* The elements of `ridpointers' are identifier nodes for the reserved
 122    type names and storage classes.  It is indexed by a RID_... value.  */
 123 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 124
 125 /* Standard named or nameless data types of the C compiler.  */
 126
 127 enum c_tree_index
 128 {
 129     CTI_WCHAR_TYPE,
 130     CTI_SIGNED_WCHAR_TYPE,
 131     CTI_UNSIGNED_WCHAR_TYPE,
 132     CTI_WINT_TYPE,
 133     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 134     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 135     CTI_INTMAX_TYPE,
 136     CTI_UINTMAX_TYPE,
 137     CTI_WIDEST_INT_LIT_TYPE,
 138     CTI_WIDEST_UINT_LIT_TYPE,
 139
 140     CTI_CHAR_ARRAY_TYPE,
 141     CTI_WCHAR_ARRAY_TYPE,
 142     CTI_INT_ARRAY_TYPE,
 143     CTI_STRING_TYPE,
 144     CTI_CONST_STRING_TYPE,
 145
 146     /* Type for boolean expressions (bool in C++, int in C).  */
 147     CTI_TRUTHVALUE_TYPE,
 148     CTI_TRUTHVALUE_TRUE,
 149     CTI_TRUTHVALUE_FALSE,
 150
 151     CTI_DEFAULT_FUNCTION_TYPE,
 152
 153     /* These are not types, but we have to look them up all the time.  */
 154     CTI_FUNCTION_NAME_DECL,
 155     CTI_PRETTY_FUNCTION_NAME_DECL,
 156     CTI_C99_FUNCTION_NAME_DECL,
 157     CTI_SAVED_FUNCTION_NAME_DECLS,
 158
 159     CTI_VOID_ZERO,
 160
 161     CTI_NULL,
 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 /* The node for C++ `__null'.  */
 208 #define null_node                       c_global_trees[CTI_NULL]
 209
 210 extern GTY(()) tree c_global_trees[CTI_MAX];
 211
 212 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 213    tree for size reasons.  */
 214 struct sorted_fields_type GTY(())
 215 {
 216   int len;
 217   tree GTY((length ("%h.len"))) elts[1];
 218 };
 219
 220 /* Mark which labels are explicitly declared.
 221    These may be shadowed, and may be referenced from nested functions.  */
 222 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 223
 224 typedef enum c_language_kind
 225 {
 226   clk_c         = 0,            /* C90, C94 or C99 */
 227   clk_objc      = 1,            /* clk_c with ObjC features.  */
 228   clk_cxx       = 2,            /* ANSI/ISO C++ */
 229   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 230 }
 231 c_language_kind;
 232
 233 /* To test for a specific language use c_language, defined by each
 234    front end.  For "ObjC features" or "not C++" use the macros.  */
 235 extern c_language_kind c_language;
 236
 237 #define c_dialect_cxx()         (c_language & clk_cxx)
 238 #define c_dialect_objc()        (c_language & clk_objc)
 239
 240 /* Information about a statement tree.  */
 241
 242 struct stmt_tree_s GTY(()) {
 243   /* The current statement list being collected.  */
 244   tree x_cur_stmt_list;
 245
 246   /* In C++, Nonzero if we should treat statements as full
 247      expressions.  In particular, this variable is no-zero if at the
 248      end of a statement we should destroy any temporaries created
 249      during that statement.  Similarly, if, at the end of a block, we
 250      should destroy any local variables in this block.  Normally, this
 251      variable is nonzero, since those are the normal semantics of
 252      C++.
 253
 254      However, in order to represent aggregate initialization code as
 255      tree structure, we use statement-expressions.  The statements
 256      within the statement expression should not result in cleanups
 257      being run until the entire enclosing statement is complete.
 258
 259      This flag has no effect in C.  */
 260   int stmts_are_full_exprs_p;
 261 };
 262
 263 typedef struct stmt_tree_s *stmt_tree;
 264
 265 /* Global state pertinent to the current function.  Some C dialects
 266    extend this structure with additional fields.  */
 267
 268 struct c_language_function GTY(()) {
 269   /* While we are parsing the function, this contains information
 270      about the statement-tree that we are building.  */
 271   struct stmt_tree_s x_stmt_tree;
 272 };
 273
 274 /* When building a statement-tree, this is the current statement list
 275    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 276    statement list.  */
 277
 278 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 279
 280 /* Language-specific hooks.  */
 281
 282 /* Callback that determines if it's ok for a function to have no
 283    noreturn attribute.  */
 284 extern int (*lang_missing_noreturn_ok_p) (tree);
 285
 286 /* If non-NULL, this function is called after a precompile header file
 287    is loaded.  */
 288 extern void (*lang_post_pch_load) (void);
 289
 290 extern void push_file_scope (void);
 291 extern void pop_file_scope (void);
 292 extern stmt_tree current_stmt_tree (void);
 293 extern tree push_stmt_list (void);
 294 extern tree pop_stmt_list (tree);
 295 extern tree add_stmt (tree);
 296 extern void push_cleanup (tree, tree, bool);
 297 extern tree pushdecl_top_level (tree);
 298 extern tree pushdecl (tree);
 299 extern tree build_modify_expr (tree, enum tree_code, tree);
 300 extern tree build_indirect_ref (tree, const char *);
 301
 302 extern int c_expand_decl (tree);
 303
 304 extern int field_decl_cmp (const void *, const void *);
 305 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 306                                   void *);
 307 extern bool has_c_linkage (tree decl);
 308 \f
 309 /* Switches common to the C front ends.  */
 310
 311 /* Nonzero if prepreprocessing only.  */
 312
 313 extern int flag_preprocess_only;
 314
 315 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 316    calls will be used in ObjC; passing nil receivers to such calls
 317    will most likely result in crashes.  */
 318 extern int flag_nil_receivers;
 319
 320 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 321    @try, etc.) in source code.  */
 322 extern int flag_objc_exceptions;
 323
 324 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 325 extern int flag_objc_sjlj_exceptions;
 326
 327 /* Nonzero means that code generation will be altered to support
 328    "zero-link" execution.  This currently affects ObjC only, but may
 329    affect other languages in the future.  */
 330 extern int flag_zero_link;
 331
 332 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 333    unit.  It will inform the ObjC runtime that class definition(s) herein
 334    contained are to replace one(s) previously loaded.  */
 335 extern int flag_replace_objc_classes;
 336
 337 /* Nonzero means don't output line number information.  */
 338
 339 extern char flag_no_line_commands;
 340
 341 /* Nonzero causes -E output not to be done, but directives such as
 342    #define that have side effects are still obeyed.  */
 343
 344 extern char flag_no_output;
 345
 346 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 347    'N' of the command line switch.  */
 348
 349 extern char flag_dump_macros;
 350
 351 /* Nonzero means pass #include lines through to the output.  */
 352
 353 extern char flag_dump_includes;
 354
 355 /* Nonzero means process PCH files while preprocessing.  */
 356
 357 extern bool flag_pch_preprocess;
 358
 359 /* The file name to which we should write a precompiled header, or
 360    NULL if no header will be written in this compile.  */
 361
 362 extern const char *pch_file;
 363
 364 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 365    user's namespace.  */
 366
 367 extern int flag_iso;
 368
 369 /* Nonzero if -undef was given.  It suppresses target built-in macros
 370    and assertions.  */
 371
 372 extern int flag_undef;
 373
 374 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 375
 376 extern int flag_no_builtin;
 377
 378 /* Nonzero means don't recognize the non-ANSI builtin functions.
 379    -ansi sets this.  */
 380
 381 extern int flag_no_nonansi_builtin;
 382
 383 /* Nonzero means give `double' the same size as `float'.  */
 384
 385 extern int flag_short_double;
 386
 387 /* Nonzero means give `wchar_t' the same size as `short'.  */
 388
 389 extern int flag_short_wchar;
 390
 391 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 392 extern int flag_ms_extensions;
 393
 394 /* Nonzero means don't recognize the keyword `asm'.  */
 395
 396 extern int flag_no_asm;
 397
 398 /* Nonzero means give string constants the type `const char *', as mandated
 399    by the standard.  */
 400
 401 extern int flag_const_strings;
 402
 403 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 404
 405 extern int flag_signed_bitfields;
 406
 407 /* Warn about #pragma directives that are not recognized.  */
 408
 409 extern int warn_unknown_pragmas; /* Tri state variable.  */
 410
 411 /* Warn about format/argument anomalies in calls to formatted I/O functions
 412    (*printf, *scanf, strftime, strfmon, etc.).  */
 413
 414 extern int warn_format;
 415
 416
 417 /* C/ObjC language option variables.  */
 418
 419
 420 /* Nonzero means allow type mismatches in conditional expressions;
 421    just make their values `void'.  */
 422
 423 extern int flag_cond_mismatch;
 424
 425 /* Nonzero means enable C89 Amendment 1 features.  */
 426
 427 extern int flag_isoc94;
 428
 429 /* Nonzero means use the ISO C99 dialect of C.  */
 430
 431 extern int flag_isoc99;
 432
 433 /* Nonzero means that we have builtin functions, and main is an int.  */
 434
 435 extern int flag_hosted;
 436
 437 /* Warn if main is suspicious.  */
 438
 439 extern int warn_main;
 440
 441
 442 /* ObjC language option variables.  */
 443
 444
 445 /* Open and close the file for outputting class declarations, if
 446    requested (ObjC).  */
 447
 448 extern int flag_gen_declaration;
 449
 450 /* Tells the compiler that this is a special run.  Do not perform any
 451    compiling, instead we are to test some platform dependent features
 452    and output a C header file with appropriate definitions.  */
 453
 454 extern int print_struct_values;
 455
 456 /* ???.  Undocumented.  */
 457
 458 extern const char *constant_string_class_name;
 459
 460
 461 /* C++ language option variables.  */
 462
 463
 464 /* Nonzero means don't recognize any extension keywords.  */
 465
 466 extern int flag_no_gnu_keywords;
 467
 468 /* Nonzero means do emit exported implementations of functions even if
 469    they can be inlined.  */
 470
 471 extern int flag_implement_inlines;
 472
 473 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 474
 475 extern int flag_implicit_templates;
 476
 477 /* Nonzero means that implicit instantiations of inline templates will be
 478    emitted if needed, even if instantiations of non-inline templates
 479    aren't.  */
 480
 481 extern int flag_implicit_inline_templates;
 482
 483 /* Nonzero means generate separate instantiation control files and
 484    juggle them at link time.  */
 485
 486 extern int flag_use_repository;
 487
 488 /* Nonzero if we want to issue diagnostics that the standard says are not
 489    required.  */
 490
 491 extern int flag_optional_diags;
 492
 493 /* Nonzero means we should attempt to elide constructors when possible.  */
 494
 495 extern int flag_elide_constructors;
 496
 497 /* Nonzero means that member functions defined in class scope are
 498    inline by default.  */
 499
 500 extern int flag_default_inline;
 501
 502 /* Controls whether compiler generates 'type descriptor' that give
 503    run-time type information.  */
 504
 505 extern int flag_rtti;
 506
 507 /* Nonzero if we want to conserve space in the .o files.  We do this
 508    by putting uninitialized data and runtime initialized data into
 509    .common instead of .data at the expense of not flagging multiple
 510    definitions.  */
 511
 512 extern int flag_conserve_space;
 513
 514 /* Nonzero if we want to obey access control semantics.  */
 515
 516 extern int flag_access_control;
 517
 518 /* Nonzero if we want to check the return value of new and avoid calling
 519    constructors if it is a null pointer.  */
 520
 521 extern int flag_check_new;
 522
 523 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 524    initialization variables.
 525    0: Old rules, set by -fno-for-scope.
 526    2: New ISO rules, set by -ffor-scope.
 527    1: Try to implement new ISO rules, but with backup compatibility
 528    (and warnings).  This is the default, for now.  */
 529
 530 extern int flag_new_for_scope;
 531
 532 /* Nonzero if we want to emit defined symbols with common-like linkage as
 533    weak symbols where possible, in order to conform to C++ semantics.
 534    Otherwise, emit them as local symbols.  */
 535
 536 extern int flag_weak;
 537
 538 /* 0 means we want the preprocessor to not emit line directives for
 539    the current working directory.  1 means we want it to do it.  -1
 540    means we should decide depending on whether debugging information
 541    is being emitted or not.  */
 542
 543 extern int flag_working_directory;
 544
 545 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 546    destructors for local statics and global objects.  */
 547
 548 extern int flag_use_cxa_atexit;
 549
 550 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
 551    logic.  */
 552
 553 extern int flag_use_cxa_get_exception_ptr;
 554
 555 /* Nonzero means make the default pedwarns warnings instead of errors.
 556    The value of this flag is ignored if -pedantic is specified.  */
 557
 558 extern int flag_permissive;
 559
 560 /* Nonzero means to implement standard semantics for exception
 561    specifications, calling unexpected if an exception is thrown that
 562    doesn't match the specification.  Zero means to treat them as
 563    assertions and optimize accordingly, but not check them.  */
 564
 565 extern int flag_enforce_eh_specs;
 566
 567 /* Nonzero (the default) means to generate thread-safe code for
 568    initializing local statics.  */
 569
 570 extern int flag_threadsafe_statics;
 571
 572 /* Nonzero means warn about implicit declarations.  */
 573
 574 extern int warn_implicit;
 575
 576 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 577    with GCC this doesn't matter as __null is guaranteed to have the right
 578    size.  */
 579
 580 extern int warn_strict_null_sentinel;
 581
 582 /* Maximum template instantiation depth.  This limit is rather
 583    arbitrary, but it exists to limit the time it takes to notice
 584    infinite template instantiations.  */
 585
 586 extern int max_tinst_depth;
 587
 588 /* Nonzero means the expression being parsed will never be evaluated.
 589    This is a count, since unevaluated expressions can nest.  */
 590
 591 extern int skip_evaluation;
 592
 593 /* C types are partitioned into three subsets: object, function, and
 594    incomplete types.  */
 595 #define C_TYPE_OBJECT_P(type) \
 596   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 597
 598 #define C_TYPE_INCOMPLETE_P(type) \
 599   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 600
 601 #define C_TYPE_FUNCTION_P(type) \
 602   (TREE_CODE (type) == FUNCTION_TYPE)
 603
 604 /* For convenience we define a single macro to identify the class of
 605    object or incomplete types.  */
 606 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 607   (!C_TYPE_FUNCTION_P (type))
 608
 609 /* Attribute table common to the C front ends.  */
 610 extern const struct attribute_spec c_common_attribute_table[];
 611 extern const struct attribute_spec c_common_format_attribute_table[];
 612
 613 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 614    ID is the identifier to use, NAME is the string.
 615    TYPE_DEP indicates whether it depends on type of the function or not
 616    (i.e. __PRETTY_FUNCTION__).  */
 617
 618 extern tree (*make_fname_decl) (tree, int);
 619
 620 extern tree identifier_global_value (tree);
 621 extern void record_builtin_type (enum rid, const char *, tree);
 622 extern tree build_void_list_node (void);
 623 extern void start_fname_decls (void);
 624 extern void finish_fname_decls (void);
 625 extern const char *fname_as_string (int);
 626 extern tree fname_decl (unsigned, tree);
 627
 628 extern void check_function_arguments (tree, tree, tree);
 629 extern void check_function_arguments_recurse (void (*)
 630                                               (void *, tree,
 631                                                unsigned HOST_WIDE_INT),
 632                                               void *, tree,
 633                                               unsigned HOST_WIDE_INT);
 634 extern void check_function_format (tree, tree);
 635 extern void set_Wformat (int);
 636 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 637 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 638 extern int c_common_handle_option (size_t code, const char *arg, int value);
 639 extern bool c_common_missing_argument (const char *opt, size_t code);
 640 extern tree c_common_type_for_mode (enum machine_mode, int);
 641 extern tree c_common_type_for_size (unsigned int, int);
 642 extern tree c_common_unsigned_type (tree);
 643 extern tree c_common_signed_type (tree);
 644 extern tree c_common_signed_or_unsigned_type (int, tree);
 645 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 646 extern tree c_common_truthvalue_conversion (tree);
 647 extern void c_apply_type_quals_to_decl (int, tree);
 648 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 649 extern tree c_alignof_expr (tree);
 650 /* Print an error message for invalid operands to arith operation CODE.
 651    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 652 extern void binary_op_error (enum tree_code);
 653 extern tree fix_string_type (tree);
 654 struct varray_head_tag;
 655 extern void constant_expression_warning (tree);
 656 extern void strict_aliasing_warning(tree, tree, tree);
 657 extern void empty_body_warning (tree, tree);
 658 extern tree convert_and_check (tree, tree);
 659 extern void overflow_warning (tree);
 660 extern bool c_determine_visibility (tree);
 661 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 662
 663 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 664 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 665
 666 /* Subroutine of build_binary_op, used for comparison operations.
 667    See if the operands have both been converted from subword integer types
 668    and, if so, perhaps change them both back to their original type.  */
 669 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 670
 671 extern tree pointer_int_sum (enum tree_code, tree, tree);
 672 extern unsigned int min_precision (tree, int);
 673
 674 /* Add qualifiers to a type, in the fashion for C.  */
 675 extern tree c_build_qualified_type (tree, int);
 676
 677 /* Build tree nodes and builtin functions common to both C and C++ language
 678    frontends.  */
 679 extern void c_common_nodes_and_builtins (void);
 680
 681 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 682
 683 extern void disable_builtin_function (const char *);
 684
 685 extern void set_compound_literal_name (tree decl);
 686
 687 extern tree build_va_arg (tree, tree);
 688
 689 extern unsigned int c_common_init_options (unsigned int, const char **);
 690 extern bool c_common_post_options (const char **);
 691 extern bool c_common_init (void);
 692 extern void c_common_finish (void);
 693 extern void c_common_parse_file (int);
 694 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 695 extern void c_register_builtin_type (tree, const char*);
 696 extern bool c_promoting_integer_type_p (tree);
 697 extern int self_promoting_args_p (tree);
 698 extern tree strip_array_types (tree);
 699 extern tree strip_pointer_operator (tree);
 700 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 701
 702 /* This is the basic parsing function.  */
 703 extern void c_parse_file (void);
 704 /* This is misnamed, it actually performs end-of-compilation processing.  */
 705 extern void finish_file (void);
 706
 707
 708 /* These macros provide convenient access to the various _STMT nodes.  */
 709
 710 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 711    if a statement expression.  */
 712 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 713   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 714
 715 /* Nonzero if a label has been added to the statement list.  */
 716 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 717   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 718
 719 /* COMPOUND_LITERAL_EXPR accessors.  */
 720 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 721   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 722 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 723   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 724
 725 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 726
 727 enum c_tree_code {
 728   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 729 #include "c-common.def"
 730   LAST_C_TREE_CODE
 731 };
 732
 733 #undef DEFTREECODE
 734
 735 extern int anon_aggr_type_p (tree);
 736
 737 /* For a VAR_DECL that is an anonymous union, these are the various
 738    sub-variables that make up the anonymous union.  */
 739 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 740
 741 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 742 #define DECL_C_BIT_FIELD(NODE) \
 743   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 744 #define SET_DECL_C_BIT_FIELD(NODE) \
 745   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 746 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 747   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 748
 749 extern void emit_local_var (tree);
 750 extern tree do_case (tree, tree);
 751 extern tree build_stmt (enum tree_code, ...);
 752 extern tree build_case_label (tree, tree, tree);
 753
 754 /* These functions must be defined by each front-end which implements
 755    a variant of the C language.  They are used in c-common.c.  */
 756
 757 extern tree build_unary_op (enum tree_code, tree, int);
 758 extern tree build_binary_op (enum tree_code, tree, tree, int);
 759 extern tree perform_integral_promotions (tree);
 760
 761 /* These functions must be defined by each front-end which implements
 762    a variant of the C language.  They are used by port files.  */
 763
 764 extern tree default_conversion (tree);
 765
 766 /* Given two integer or real types, return the type for their sum.
 767    Given two compatible ANSI C types, returns the merged type.  */
 768
 769 extern tree common_type (tree, tree);
 770
 771 extern tree decl_constant_value (tree);
 772
 773 /* Handle increment and decrement of boolean types.  */
 774 extern tree boolean_increment (enum tree_code, tree);
 775
 776 extern int case_compare (splay_tree_key, splay_tree_key);
 777
 778 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 779
 780 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 781
 782 extern tree build_function_call (tree, tree);
 783
 784 extern tree resolve_overloaded_builtin (tree, tree);
 785
 786 extern tree finish_label_address_expr (tree);
 787
 788 /* Same function prototype, but the C and C++ front ends have
 789    different implementations.  Used in c-common.c.  */
 790 extern tree lookup_label (tree);
 791 extern tree lookup_name (tree);
 792
 793 extern int vector_types_convertible_p (tree t1, tree t2);
 794
 795 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 796
 797 extern tree c_staticp (tree);
 798
 799 extern void init_c_lex (void);
 800
 801 extern void c_cpp_builtins (cpp_reader *);
 802
 803 /* Positive if an implicit `extern "C"' scope has just been entered;
 804    negative if such a scope has just been exited.  */
 805 extern GTY(()) int pending_lang_change;
 806
 807 /* Information recorded about each file examined during compilation.  */
 808
 809 struct c_fileinfo
 810 {
 811   int time;     /* Time spent in the file.  */
 812
 813   /* Flags used only by C++.
 814      INTERFACE_ONLY nonzero means that we are in an "interface" section
 815      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 816      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 817      INTERFACE_ONLY is zero, it means that we are responsible for
 818      exporting definitions that others might need.  */
 819   short interface_only;
 820   short interface_unknown;
 821 };
 822
 823 struct c_fileinfo *get_fileinfo (const char *);
 824 extern void dump_time_statistics (void);
 825
 826 extern bool c_dump_tree (void *, tree);
 827
 828 extern void c_warn_unused_result (tree *);
 829
 830 extern void verify_sequence_points (tree);
 831
 832 extern tree fold_offsetof (tree, tree);
 833
 834 /* Places where an lvalue, or modifiable lvalue, may be required.
 835    Used to select diagnostic messages in lvalue_error and
 836    readonly_error.  */
 837 enum lvalue_use {
 838   lv_assign,
 839   lv_increment,
 840   lv_decrement,
 841   lv_addressof,
 842   lv_asm
 843 };
 844
 845 extern void lvalue_error (enum lvalue_use);
 846
 847 extern int complete_array_type (tree *, tree, bool);
 848
 849 extern tree builtin_type_for_size (int, bool);
 850
 851 extern void warn_array_subscript_with_type_char (tree);
 852
 853 /* In c-gimplify.c  */
 854 extern void c_genericize (tree);
 855 extern int c_gimplify_expr (tree *, tree *, tree *);
 856 extern tree c_build_bind_expr (tree, tree);
 857
 858 /* In c-pch.c  */
 859 extern void pch_init (void);
 860 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 861 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 862                                const char *orig);
 863 extern void c_common_write_pch (void);
 864 extern void c_common_no_more_pch (void);
 865 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
 866 extern void c_common_print_pch_checksum (FILE *f);
 867
 868 /* In *-checksum.c */
 869 extern const unsigned char executable_checksum[16];
 870
 871 extern void builtin_define_with_value (const char *, const char *, int);
 872 extern void c_stddef_cpp_builtins (void);
 873 extern void fe_file_change (const struct line_map *);
 874 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 875
 876 /* Objective-C / Objective-C++ entry points.  */
 877
 878 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 879    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 880 extern tree objc_is_class_name (tree);
 881 extern tree objc_is_object_ptr (tree);
 882 extern void objc_check_decl (tree);
 883 extern int objc_is_reserved_word (tree);
 884 extern bool objc_compare_types (tree, tree, int, tree);
 885 extern void objc_volatilize_decl (tree);
 886 extern bool objc_type_quals_match (tree, tree);
 887 extern tree objc_rewrite_function_call (tree, tree);
 888 extern tree objc_message_selector (void);
 889 extern tree objc_lookup_ivar (tree, tree);
 890 extern void objc_clear_super_receiver (void);
 891 extern int objc_is_public (tree, tree);
 892 extern tree objc_is_id (tree);
 893 extern void objc_declare_alias (tree, tree);
 894 extern void objc_declare_class (tree);
 895 extern void objc_declare_protocols (tree);
 896 extern tree objc_build_message_expr (tree);
 897 extern tree objc_finish_message_expr (tree, tree, tree);
 898 extern tree objc_build_selector_expr (tree);
 899 extern tree objc_build_protocol_expr (tree);
 900 extern tree objc_build_encode_expr (tree);
 901 extern tree objc_build_string_object (tree);
 902 extern tree objc_get_protocol_qualified_type (tree, tree);
 903 extern tree objc_get_class_reference (tree);
 904 extern tree objc_get_class_ivars (tree);
 905 extern void objc_start_class_interface (tree, tree, tree);
 906 extern void objc_start_category_interface (tree, tree, tree);
 907 extern void objc_start_protocol (tree, tree);
 908 extern void objc_continue_interface (void);
 909 extern void objc_finish_interface (void);
 910 extern void objc_start_class_implementation (tree, tree);
 911 extern void objc_start_category_implementation (tree, tree);
 912 extern void objc_continue_implementation (void);
 913 extern void objc_finish_implementation (void);
 914 extern void objc_set_visibility (int);
 915 extern void objc_set_method_type (enum tree_code);
 916 extern tree objc_build_method_signature (tree, tree, tree, bool);
 917 extern void objc_add_method_declaration (tree);
 918 extern void objc_start_method_definition (tree);
 919 extern void objc_finish_method_definition (tree);
 920 extern void objc_add_instance_variable (tree);
 921 extern tree objc_build_keyword_decl (tree, tree, tree);
 922 extern tree objc_build_throw_stmt (tree);
 923 extern void objc_begin_try_stmt (location_t, tree);
 924 extern tree objc_finish_try_stmt (void);
 925 extern void objc_begin_catch_clause (tree);
 926 extern void objc_finish_catch_clause (void);
 927 extern void objc_build_finally_clause (location_t, tree);
 928 extern tree objc_build_synchronized (location_t, tree, tree);
 929 extern int objc_static_init_needed_p (void);
 930 extern tree objc_generate_static_init_call (tree);
 931 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
 932
 933 /* The following are provided by the C and C++ front-ends, and called by
 934    ObjC/ObjC++.  */
 935 extern void *objc_get_current_scope (void);
 936 extern void objc_mark_locals_volatile (void *);
 937
 938 /* In c-ppoutput.c  */
 939 extern void init_pp_output (FILE *);
 940 extern void preprocess_file (cpp_reader *);
 941 extern void pp_file_change (const struct line_map *);
 942 extern void pp_dir_change (cpp_reader *, const char *);
 943 extern bool check_missing_format_attribute (tree, tree);
 944
 945 /* In c-omp.c  */
 946 extern tree c_finish_omp_master (tree);
 947 extern tree c_finish_omp_critical (tree, tree);
 948 extern tree c_finish_omp_ordered (tree);
 949 extern void c_finish_omp_barrier (void);
 950 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
 951 extern void c_finish_omp_flush (void);
 952 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
 953 extern void c_split_parallel_clauses (tree, tree *, tree *);
 954 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
 955
 956 /* Not in c-omp.c; provided by the front end.  */
 957 extern bool c_omp_sharing_predetermined (tree);
 958 extern tree c_omp_remap_decl (tree, bool);
 959
 960 /* In order for the format checking to accept the C frontend
 961    diagnostic framework extensions, you must include this file before
 962    toplev.h, not after.  The C front end formats are a subset of those
 963    for C++, so they are the appropriate set to use in common code;
 964    cp-tree.h overrides this for C++.  */
 965 #ifndef GCC_DIAG_STYLE
 966 #define GCC_DIAG_STYLE __gcc_cdiag__
 967 #endif
 968
 969 #endif /* ! GCC_C_COMMON_H */