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, RID_SAT,
  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   RID_FRACT, RID_ACCUM,
  76
  77   /* Too many ways of getting the name of a function as a string */
  78   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  79
  80   /* C++ */
  81   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  82   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  83   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  84   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  85   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  86   RID_THIS,     RID_THROW,    RID_TRUE,
  87   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  88   RID_USING,    RID_CHAR16,   RID_CHAR32,
  89
  90   /* casts */
  91   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  92
  93   /* C++ extensions */
  94   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
  95   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
  96   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
  97   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_VIRTUAL_DESTRUCTOR,
  98   RID_IS_ABSTRACT,             RID_IS_BASE_OF,
  99   RID_IS_CONVERTIBLE_TO,       RID_IS_CLASS,
 100   RID_IS_EMPTY,                RID_IS_ENUM,
 101   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 102   RID_IS_UNION,
 103
 104   /* C++0x */
 105   RID_STATIC_ASSERT, RID_DECLTYPE,
 106
 107   /* Objective-C */
 108   RID_AT_ENCODE,   RID_AT_END,
 109   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 110   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 111   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 112   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 113   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 114   RID_AT_INTERFACE,
 115   RID_AT_IMPLEMENTATION,
 116
 117   RID_MAX,
 118
 119   RID_FIRST_MODIFIER = RID_STATIC,
 120   RID_LAST_MODIFIER = RID_ONEWAY,
 121
 122   RID_FIRST_CXX0X = RID_STATIC_ASSERT,
 123   RID_LAST_CXX0X = RID_DECLTYPE,
 124   RID_FIRST_AT = RID_AT_ENCODE,
 125   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 126   RID_FIRST_PQ = RID_IN,
 127   RID_LAST_PQ = RID_ONEWAY
 128 };
 129
 130 #define OBJC_IS_AT_KEYWORD(rid) \
 131   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 132    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 133
 134 #define OBJC_IS_PQ_KEYWORD(rid) \
 135   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 136    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 137
 138 /* The elements of `ridpointers' are identifier nodes for the reserved
 139    type names and storage classes.  It is indexed by a RID_... value.  */
 140 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 141
 142 /* Standard named or nameless data types of the C compiler.  */
 143
 144 enum c_tree_index
 145 {
 146     CTI_CHAR16_TYPE,
 147     CTI_CHAR32_TYPE,
 148     CTI_WCHAR_TYPE,
 149     CTI_SIGNED_WCHAR_TYPE,
 150     CTI_UNSIGNED_WCHAR_TYPE,
 151     CTI_WINT_TYPE,
 152     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 153     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 154     CTI_INTMAX_TYPE,
 155     CTI_UINTMAX_TYPE,
 156     CTI_WIDEST_INT_LIT_TYPE,
 157     CTI_WIDEST_UINT_LIT_TYPE,
 158
 159     CTI_CHAR_ARRAY_TYPE,
 160     CTI_CHAR16_ARRAY_TYPE,
 161     CTI_CHAR32_ARRAY_TYPE,
 162     CTI_WCHAR_ARRAY_TYPE,
 163     CTI_INT_ARRAY_TYPE,
 164     CTI_STRING_TYPE,
 165     CTI_CONST_STRING_TYPE,
 166
 167     /* Type for boolean expressions (bool in C++, int in C).  */
 168     CTI_TRUTHVALUE_TYPE,
 169     CTI_TRUTHVALUE_TRUE,
 170     CTI_TRUTHVALUE_FALSE,
 171
 172     CTI_DEFAULT_FUNCTION_TYPE,
 173
 174     /* These are not types, but we have to look them up all the time.  */
 175     CTI_FUNCTION_NAME_DECL,
 176     CTI_PRETTY_FUNCTION_NAME_DECL,
 177     CTI_C99_FUNCTION_NAME_DECL,
 178     CTI_SAVED_FUNCTION_NAME_DECLS,
 179
 180     CTI_VOID_ZERO,
 181
 182     CTI_NULL,
 183
 184     CTI_MAX
 185 };
 186
 187 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 188
 189 /* Identifier part common to the C front ends.  Inherits from
 190    tree_identifier, despite appearances.  */
 191 struct c_common_identifier GTY(())
 192 {
 193   struct tree_common common;
 194   struct cpp_hashnode node;
 195 };
 196
 197 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 198 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 199 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 200 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 201 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 202 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 203 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 204 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 205 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 206 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 207 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 208 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 209
 210 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 211 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 212 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 213
 214 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 215 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 216 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 217 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 218 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 219 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 220 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 221
 222 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 223
 224 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 225 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 226 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 227 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 228
 229 /* A node for `((void) 0)'.  */
 230 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 231
 232 /* The node for C++ `__null'.  */
 233 #define null_node                       c_global_trees[CTI_NULL]
 234
 235 extern GTY(()) tree c_global_trees[CTI_MAX];
 236
 237 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 238    tree for size reasons.  */
 239 struct sorted_fields_type GTY(())
 240 {
 241   int len;
 242   tree GTY((length ("%h.len"))) elts[1];
 243 };
 244
 245 /* Mark which labels are explicitly declared.
 246    These may be shadowed, and may be referenced from nested functions.  */
 247 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 248
 249 typedef enum c_language_kind
 250 {
 251   clk_c         = 0,            /* C90, C94 or C99 */
 252   clk_objc      = 1,            /* clk_c with ObjC features.  */
 253   clk_cxx       = 2,            /* ANSI/ISO C++ */
 254   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 255 }
 256 c_language_kind;
 257
 258 /* To test for a specific language use c_language, defined by each
 259    front end.  For "ObjC features" or "not C++" use the macros.  */
 260 extern c_language_kind c_language;
 261
 262 #define c_dialect_cxx()         (c_language & clk_cxx)
 263 #define c_dialect_objc()        (c_language & clk_objc)
 264
 265 /* Information about a statement tree.  */
 266
 267 struct stmt_tree_s GTY(()) {
 268   /* The current statement list being collected.  */
 269   tree x_cur_stmt_list;
 270
 271   /* In C++, Nonzero if we should treat statements as full
 272      expressions.  In particular, this variable is no-zero if at the
 273      end of a statement we should destroy any temporaries created
 274      during that statement.  Similarly, if, at the end of a block, we
 275      should destroy any local variables in this block.  Normally, this
 276      variable is nonzero, since those are the normal semantics of
 277      C++.
 278
 279      However, in order to represent aggregate initialization code as
 280      tree structure, we use statement-expressions.  The statements
 281      within the statement expression should not result in cleanups
 282      being run until the entire enclosing statement is complete.
 283
 284      This flag has no effect in C.  */
 285   int stmts_are_full_exprs_p;
 286 };
 287
 288 typedef struct stmt_tree_s *stmt_tree;
 289
 290 /* Global state pertinent to the current function.  Some C dialects
 291    extend this structure with additional fields.  */
 292
 293 struct c_language_function GTY(()) {
 294   /* While we are parsing the function, this contains information
 295      about the statement-tree that we are building.  */
 296   struct stmt_tree_s x_stmt_tree;
 297 };
 298
 299 /* When building a statement-tree, this is the current statement list
 300    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 301    statement list.  */
 302
 303 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 304
 305 /* Language-specific hooks.  */
 306
 307 /* If non-NULL, this function is called after a precompile header file
 308    is loaded.  */
 309 extern void (*lang_post_pch_load) (void);
 310
 311 extern void push_file_scope (void);
 312 extern void pop_file_scope (void);
 313 extern stmt_tree current_stmt_tree (void);
 314 extern tree push_stmt_list (void);
 315 extern tree pop_stmt_list (tree);
 316 extern tree add_stmt (tree);
 317 extern void push_cleanup (tree, tree, bool);
 318 extern tree pushdecl_top_level (tree);
 319 extern tree pushdecl (tree);
 320 extern tree build_modify_expr (tree, enum tree_code, tree);
 321 extern tree build_indirect_ref (tree, const char *);
 322
 323 extern int c_expand_decl (tree);
 324
 325 extern int field_decl_cmp (const void *, const void *);
 326 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 327                                   void *);
 328 extern bool has_c_linkage (const_tree decl);
 329 \f
 330 /* Switches common to the C front ends.  */
 331
 332 /* Nonzero if prepreprocessing only.  */
 333
 334 extern int flag_preprocess_only;
 335
 336 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 337    calls will be used in ObjC; passing nil receivers to such calls
 338    will most likely result in crashes.  */
 339 extern int flag_nil_receivers;
 340
 341 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 342    @try, etc.) in source code.  */
 343 extern int flag_objc_exceptions;
 344
 345 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 346 extern int flag_objc_sjlj_exceptions;
 347
 348 /* Nonzero means that code generation will be altered to support
 349    "zero-link" execution.  This currently affects ObjC only, but may
 350    affect other languages in the future.  */
 351 extern int flag_zero_link;
 352
 353 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 354    unit.  It will inform the ObjC runtime that class definition(s) herein
 355    contained are to replace one(s) previously loaded.  */
 356 extern int flag_replace_objc_classes;
 357
 358 /* Nonzero means don't output line number information.  */
 359
 360 extern char flag_no_line_commands;
 361
 362 /* Nonzero causes -E output not to be done, but directives such as
 363    #define that have side effects are still obeyed.  */
 364
 365 extern char flag_no_output;
 366
 367 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 368    'N' or 'U' of the command line switch.  */
 369
 370 extern char flag_dump_macros;
 371
 372 /* Nonzero means pass #include lines through to the output.  */
 373
 374 extern char flag_dump_includes;
 375
 376 /* Nonzero means process PCH files while preprocessing.  */
 377
 378 extern bool flag_pch_preprocess;
 379
 380 /* The file name to which we should write a precompiled header, or
 381    NULL if no header will be written in this compile.  */
 382
 383 extern const char *pch_file;
 384
 385 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 386    user's namespace.  */
 387
 388 extern int flag_iso;
 389
 390 /* Nonzero if -undef was given.  It suppresses target built-in macros
 391    and assertions.  */
 392
 393 extern int flag_undef;
 394
 395 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 396
 397 extern int flag_no_builtin;
 398
 399 /* Nonzero means don't recognize the non-ANSI builtin functions.
 400    -ansi sets this.  */
 401
 402 extern int flag_no_nonansi_builtin;
 403
 404 /* Nonzero means give `double' the same size as `float'.  */
 405
 406 extern int flag_short_double;
 407
 408 /* Nonzero means give `wchar_t' the same size as `short'.  */
 409
 410 extern int flag_short_wchar;
 411
 412 /* Nonzero means allow implicit conversions between vectors with
 413    differing numbers of subparts and/or differing element types.  */
 414 extern int flag_lax_vector_conversions;
 415
 416 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 417 extern int flag_ms_extensions;
 418
 419 /* Nonzero means don't recognize the keyword `asm'.  */
 420
 421 extern int flag_no_asm;
 422
 423 /* Nonzero means give string constants the type `const char *', as mandated
 424    by the standard.  */
 425
 426 extern int flag_const_strings;
 427
 428 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 429
 430 extern int flag_signed_bitfields;
 431
 432 /* Warn about #pragma directives that are not recognized.  */
 433
 434 extern int warn_unknown_pragmas; /* Tri state variable.  */
 435
 436 /* Warn about format/argument anomalies in calls to formatted I/O functions
 437    (*printf, *scanf, strftime, strfmon, etc.).  */
 438
 439 extern int warn_format;
 440
 441
 442 /* C/ObjC language option variables.  */
 443
 444
 445 /* Nonzero means allow type mismatches in conditional expressions;
 446    just make their values `void'.  */
 447
 448 extern int flag_cond_mismatch;
 449
 450 /* Nonzero means enable C89 Amendment 1 features.  */
 451
 452 extern int flag_isoc94;
 453
 454 /* Nonzero means use the ISO C99 dialect of C.  */
 455
 456 extern int flag_isoc99;
 457
 458 /* Nonzero means that we have builtin functions, and main is an int.  */
 459
 460 extern int flag_hosted;
 461
 462 /* Warn if main is suspicious.  */
 463
 464 extern int warn_main;
 465
 466
 467 /* ObjC language option variables.  */
 468
 469
 470 /* Open and close the file for outputting class declarations, if
 471    requested (ObjC).  */
 472
 473 extern int flag_gen_declaration;
 474
 475 /* Tells the compiler that this is a special run.  Do not perform any
 476    compiling, instead we are to test some platform dependent features
 477    and output a C header file with appropriate definitions.  */
 478
 479 extern int print_struct_values;
 480
 481 /* ???.  Undocumented.  */
 482
 483 extern const char *constant_string_class_name;
 484
 485
 486 /* C++ language option variables.  */
 487
 488
 489 /* Nonzero means don't recognize any extension keywords.  */
 490
 491 extern int flag_no_gnu_keywords;
 492
 493 /* Nonzero means do emit exported implementations of functions even if
 494    they can be inlined.  */
 495
 496 extern int flag_implement_inlines;
 497
 498 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 499
 500 extern int flag_implicit_templates;
 501
 502 /* Nonzero means that implicit instantiations of inline templates will be
 503    emitted if needed, even if instantiations of non-inline templates
 504    aren't.  */
 505
 506 extern int flag_implicit_inline_templates;
 507
 508 /* Nonzero means generate separate instantiation control files and
 509    juggle them at link time.  */
 510
 511 extern int flag_use_repository;
 512
 513 /* Nonzero if we want to issue diagnostics that the standard says are not
 514    required.  */
 515
 516 extern int flag_optional_diags;
 517
 518 /* Nonzero means we should attempt to elide constructors when possible.  */
 519
 520 extern int flag_elide_constructors;
 521
 522 /* Nonzero means that member functions defined in class scope are
 523    inline by default.  */
 524
 525 extern int flag_default_inline;
 526
 527 /* Controls whether compiler generates 'type descriptor' that give
 528    run-time type information.  */
 529
 530 extern int flag_rtti;
 531
 532 /* Nonzero if we want to conserve space in the .o files.  We do this
 533    by putting uninitialized data and runtime initialized data into
 534    .common instead of .data at the expense of not flagging multiple
 535    definitions.  */
 536
 537 extern int flag_conserve_space;
 538
 539 /* Nonzero if we want to obey access control semantics.  */
 540
 541 extern int flag_access_control;
 542
 543 /* Nonzero if we want to check the return value of new and avoid calling
 544    constructors if it is a null pointer.  */
 545
 546 extern int flag_check_new;
 547
 548 /* The supported C++ dialects.  */
 549
 550 enum cxx_dialect {
 551   /* C++98  */
 552   cxx98,
 553   /* Experimental features that are likely to become part of
 554      C++0x.  */
 555   cxx0x
 556 };
 557
 558 /* The C++ dialect being used. C++98 is the default.  */
 559 extern enum cxx_dialect cxx_dialect;
 560
 561 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 562    initialization variables.
 563    0: Old rules, set by -fno-for-scope.
 564    2: New ISO rules, set by -ffor-scope.
 565    1: Try to implement new ISO rules, but with backup compatibility
 566    (and warnings).  This is the default, for now.  */
 567
 568 extern int flag_new_for_scope;
 569
 570 /* Nonzero if we want to emit defined symbols with common-like linkage as
 571    weak symbols where possible, in order to conform to C++ semantics.
 572    Otherwise, emit them as local symbols.  */
 573
 574 extern int flag_weak;
 575
 576 /* 0 means we want the preprocessor to not emit line directives for
 577    the current working directory.  1 means we want it to do it.  -1
 578    means we should decide depending on whether debugging information
 579    is being emitted or not.  */
 580
 581 extern int flag_working_directory;
 582
 583 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 584    destructors for local statics and global objects.  */
 585
 586 extern int flag_use_cxa_atexit;
 587
 588 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
 589    logic.  */
 590
 591 extern int flag_use_cxa_get_exception_ptr;
 592
 593 /* Nonzero means to implement standard semantics for exception
 594    specifications, calling unexpected if an exception is thrown that
 595    doesn't match the specification.  Zero means to treat them as
 596    assertions and optimize accordingly, but not check them.  */
 597
 598 extern int flag_enforce_eh_specs;
 599
 600 /* Nonzero (the default) means to generate thread-safe code for
 601    initializing local statics.  */
 602
 603 extern int flag_threadsafe_statics;
 604
 605 /* Nonzero means warn about implicit declarations.  */
 606
 607 extern int warn_implicit;
 608
 609 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 610    with GCC this doesn't matter as __null is guaranteed to have the right
 611    size.  */
 612
 613 extern int warn_strict_null_sentinel;
 614
 615 /* Maximum template instantiation depth.  This limit is rather
 616    arbitrary, but it exists to limit the time it takes to notice
 617    infinite template instantiations.  */
 618
 619 extern int max_tinst_depth;
 620
 621 /* Nonzero means the expression being parsed will never be evaluated.
 622    This is a count, since unevaluated expressions can nest.  */
 623
 624 extern int skip_evaluation;
 625
 626 /* C types are partitioned into three subsets: object, function, and
 627    incomplete types.  */
 628 #define C_TYPE_OBJECT_P(type) \
 629   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 630
 631 #define C_TYPE_INCOMPLETE_P(type) \
 632   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 633
 634 #define C_TYPE_FUNCTION_P(type) \
 635   (TREE_CODE (type) == FUNCTION_TYPE)
 636
 637 /* For convenience we define a single macro to identify the class of
 638    object or incomplete types.  */
 639 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 640   (!C_TYPE_FUNCTION_P (type))
 641
 642 /* Attribute table common to the C front ends.  */
 643 extern const struct attribute_spec c_common_attribute_table[];
 644 extern const struct attribute_spec c_common_format_attribute_table[];
 645
 646 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 647    ID is the identifier to use, NAME is the string.
 648    TYPE_DEP indicates whether it depends on type of the function or not
 649    (i.e. __PRETTY_FUNCTION__).  */
 650
 651 extern tree (*make_fname_decl) (tree, int);
 652
 653 extern tree identifier_global_value (tree);
 654 extern void record_builtin_type (enum rid, const char *, tree);
 655 extern tree build_void_list_node (void);
 656 extern void start_fname_decls (void);
 657 extern void finish_fname_decls (void);
 658 extern const char *fname_as_string (int);
 659 extern tree fname_decl (unsigned, tree);
 660
 661 extern void check_function_arguments (tree, int, tree *, tree);
 662 extern void check_function_arguments_recurse (void (*)
 663                                               (void *, tree,
 664                                                unsigned HOST_WIDE_INT),
 665                                               void *, tree,
 666                                               unsigned HOST_WIDE_INT);
 667 extern bool check_builtin_function_arguments (tree, int, tree *);
 668 extern void check_function_format (tree, int, tree *);
 669 extern void set_Wformat (int);
 670 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 671 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 672 extern int c_common_handle_option (size_t code, const char *arg, int value);
 673 extern bool c_common_missing_argument (const char *opt, size_t code);
 674 extern tree c_common_type_for_mode (enum machine_mode, int);
 675 extern tree c_common_type_for_size (unsigned int, int);
 676 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 677                                                 int, int);
 678 extern tree c_common_unsigned_type (tree);
 679 extern tree c_common_signed_type (tree);
 680 extern tree c_common_signed_or_unsigned_type (int, tree);
 681 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 682 extern bool decl_with_nonnull_addr_p (const_tree);
 683 extern tree c_common_truthvalue_conversion (tree);
 684 extern void c_apply_type_quals_to_decl (int, tree);
 685 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 686 extern tree c_alignof_expr (tree);
 687 /* Print an error message for invalid operands to arith operation CODE.
 688    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 689 extern void binary_op_error (enum tree_code, tree, tree);
 690 extern tree fix_string_type (tree);
 691 struct varray_head_tag;
 692 extern void constant_expression_warning (tree);
 693 extern void constant_expression_error (tree);
 694 extern bool strict_aliasing_warning (tree, tree, tree);
 695 extern void empty_if_body_warning (tree, tree);
 696 extern void warnings_for_convert_and_check (tree, tree, tree);
 697 extern tree convert_and_check (tree, tree);
 698 extern void overflow_warning (tree);
 699 extern void warn_logical_operator (enum tree_code, tree, tree);
 700 extern void check_main_parameter_types (tree decl);
 701 extern bool c_determine_visibility (tree);
 702 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 703
 704 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 705 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 706
 707 /* Subroutine of build_binary_op, used for comparison operations.
 708    See if the operands have both been converted from subword integer types
 709    and, if so, perhaps change them both back to their original type.  */
 710 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 711
 712 extern tree pointer_int_sum (enum tree_code, tree, tree);
 713 extern unsigned int min_precision (tree, int);
 714
 715 /* Add qualifiers to a type, in the fashion for C.  */
 716 extern tree c_build_qualified_type (tree, int);
 717
 718 /* Build tree nodes and builtin functions common to both C and C++ language
 719    frontends.  */
 720 extern void c_common_nodes_and_builtins (void);
 721
 722 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 723
 724 extern void disable_builtin_function (const char *);
 725
 726 extern void set_compound_literal_name (tree decl);
 727
 728 extern tree build_va_arg (tree, tree);
 729
 730 extern unsigned int c_common_init_options (unsigned int, const char **);
 731 extern bool c_common_post_options (const char **);
 732 extern bool c_common_init (void);
 733 extern void c_common_finish (void);
 734 extern void c_common_parse_file (int);
 735 extern alias_set_type c_common_get_alias_set (tree);
 736 extern void c_register_builtin_type (tree, const char*);
 737 extern bool c_promoting_integer_type_p (const_tree);
 738 extern int self_promoting_args_p (const_tree);
 739 extern tree strip_pointer_operator (tree);
 740 extern tree strip_pointer_or_array_types (tree);
 741 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 742
 743 /* This is the basic parsing function.  */
 744 extern void c_parse_file (void);
 745 /* This is misnamed, it actually performs end-of-compilation processing.  */
 746 extern void finish_file (void);
 747
 748
 749 /* These macros provide convenient access to the various _STMT nodes.  */
 750
 751 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 752    if a statement expression.  */
 753 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 754   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 755
 756 /* Nonzero if a label has been added to the statement list.  */
 757 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 758   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 759
 760 /* COMPOUND_LITERAL_EXPR accessors.  */
 761 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 762   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 763 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 764   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 765
 766 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 767
 768 enum c_tree_code {
 769   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 770 #include "c-common.def"
 771   LAST_C_TREE_CODE
 772 };
 773
 774 #undef DEFTREECODE
 775
 776 extern int anon_aggr_type_p (const_tree);
 777
 778 /* For a VAR_DECL that is an anonymous union, these are the various
 779    sub-variables that make up the anonymous union.  */
 780 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 781
 782 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 783 #define DECL_C_BIT_FIELD(NODE) \
 784   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 785 #define SET_DECL_C_BIT_FIELD(NODE) \
 786   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 787 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 788   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 789
 790 extern void emit_local_var (tree);
 791 extern tree do_case (tree, tree);
 792 extern tree build_stmt (enum tree_code, ...);
 793 extern tree build_case_label (tree, tree, tree);
 794
 795 /* These functions must be defined by each front-end which implements
 796    a variant of the C language.  They are used in c-common.c.  */
 797
 798 extern tree build_unary_op (enum tree_code, tree, int);
 799 extern tree build_binary_op (enum tree_code, tree, tree, int);
 800 extern tree perform_integral_promotions (tree);
 801
 802 /* These functions must be defined by each front-end which implements
 803    a variant of the C language.  They are used by port files.  */
 804
 805 extern tree default_conversion (tree);
 806
 807 /* Given two integer or real types, return the type for their sum.
 808    Given two compatible ANSI C types, returns the merged type.  */
 809
 810 extern tree common_type (tree, tree);
 811
 812 extern tree decl_constant_value (tree);
 813
 814 /* Handle increment and decrement of boolean types.  */
 815 extern tree boolean_increment (enum tree_code, tree);
 816
 817 extern int case_compare (splay_tree_key, splay_tree_key);
 818
 819 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 820
 821 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 822
 823 extern tree build_function_call (tree, tree);
 824
 825 extern tree resolve_overloaded_builtin (tree, tree);
 826
 827 extern tree finish_label_address_expr (tree);
 828
 829 /* Same function prototype, but the C and C++ front ends have
 830    different implementations.  Used in c-common.c.  */
 831 extern tree lookup_label (tree);
 832 extern tree lookup_name (tree);
 833
 834 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 835
 836 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 837
 838 extern tree c_staticp (tree);
 839
 840 extern void init_c_lex (void);
 841
 842 extern void c_cpp_builtins (cpp_reader *);
 843
 844 /* Positive if an implicit `extern "C"' scope has just been entered;
 845    negative if such a scope has just been exited.  */
 846 extern GTY(()) int pending_lang_change;
 847
 848 /* Information recorded about each file examined during compilation.  */
 849
 850 struct c_fileinfo
 851 {
 852   int time;     /* Time spent in the file.  */
 853
 854   /* Flags used only by C++.
 855      INTERFACE_ONLY nonzero means that we are in an "interface" section
 856      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 857      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 858      INTERFACE_ONLY is zero, it means that we are responsible for
 859      exporting definitions that others might need.  */
 860   short interface_only;
 861   short interface_unknown;
 862 };
 863
 864 struct c_fileinfo *get_fileinfo (const char *);
 865 extern void dump_time_statistics (void);
 866
 867 extern bool c_dump_tree (void *, tree);
 868
 869 extern void c_warn_unused_result (tree *);
 870
 871 extern void verify_sequence_points (tree);
 872
 873 extern tree fold_offsetof (tree, tree);
 874
 875 /* Places where an lvalue, or modifiable lvalue, may be required.
 876    Used to select diagnostic messages in lvalue_error and
 877    readonly_error.  */
 878 enum lvalue_use {
 879   lv_assign,
 880   lv_increment,
 881   lv_decrement,
 882   lv_addressof,
 883   lv_asm
 884 };
 885
 886 extern void lvalue_error (enum lvalue_use);
 887
 888 extern int complete_array_type (tree *, tree, bool);
 889
 890 extern tree builtin_type_for_size (int, bool);
 891
 892 extern void warn_array_subscript_with_type_char (tree);
 893 extern void warn_about_parentheses (enum tree_code, enum tree_code,
 894                                     enum tree_code);
 895 extern void warn_for_unused_label (tree label);
 896 extern void warn_for_div_by_zero (tree divisor);
 897
 898
 899 /* In c-gimplify.c  */
 900 extern void c_genericize (tree);
 901 extern int c_gimplify_expr (tree *, tree *, tree *);
 902 extern tree c_build_bind_expr (tree, tree);
 903
 904 /* In c-pch.c  */
 905 extern void pch_init (void);
 906 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 907 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 908                                const char *orig);
 909 extern void c_common_write_pch (void);
 910 extern void c_common_no_more_pch (void);
 911 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
 912 extern void c_common_print_pch_checksum (FILE *f);
 913
 914 /* In *-checksum.c */
 915 extern const unsigned char executable_checksum[16];
 916
 917 extern void builtin_define_with_value (const char *, const char *, int);
 918 extern void c_stddef_cpp_builtins (void);
 919 extern void fe_file_change (const struct line_map *);
 920 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 921
 922 /* Objective-C / Objective-C++ entry points.  */
 923
 924 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 925    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 926 extern tree objc_is_class_name (tree);
 927 extern tree objc_is_object_ptr (tree);
 928 extern void objc_check_decl (tree);
 929 extern int objc_is_reserved_word (tree);
 930 extern bool objc_compare_types (tree, tree, int, tree);
 931 extern void objc_volatilize_decl (tree);
 932 extern bool objc_type_quals_match (tree, tree);
 933 extern tree objc_rewrite_function_call (tree, tree);
 934 extern tree objc_message_selector (void);
 935 extern tree objc_lookup_ivar (tree, tree);
 936 extern void objc_clear_super_receiver (void);
 937 extern int objc_is_public (tree, tree);
 938 extern tree objc_is_id (tree);
 939 extern void objc_declare_alias (tree, tree);
 940 extern void objc_declare_class (tree);
 941 extern void objc_declare_protocols (tree);
 942 extern tree objc_build_message_expr (tree);
 943 extern tree objc_finish_message_expr (tree, tree, tree);
 944 extern tree objc_build_selector_expr (tree);
 945 extern tree objc_build_protocol_expr (tree);
 946 extern tree objc_build_encode_expr (tree);
 947 extern tree objc_build_string_object (tree);
 948 extern tree objc_get_protocol_qualified_type (tree, tree);
 949 extern tree objc_get_class_reference (tree);
 950 extern tree objc_get_class_ivars (tree);
 951 extern void objc_start_class_interface (tree, tree, tree);
 952 extern void objc_start_category_interface (tree, tree, tree);
 953 extern void objc_start_protocol (tree, tree);
 954 extern void objc_continue_interface (void);
 955 extern void objc_finish_interface (void);
 956 extern void objc_start_class_implementation (tree, tree);
 957 extern void objc_start_category_implementation (tree, tree);
 958 extern void objc_continue_implementation (void);
 959 extern void objc_finish_implementation (void);
 960 extern void objc_set_visibility (int);
 961 extern void objc_set_method_type (enum tree_code);
 962 extern tree objc_build_method_signature (tree, tree, tree, bool);
 963 extern void objc_add_method_declaration (tree);
 964 extern void objc_start_method_definition (tree);
 965 extern void objc_finish_method_definition (tree);
 966 extern void objc_add_instance_variable (tree);
 967 extern tree objc_build_keyword_decl (tree, tree, tree);
 968 extern tree objc_build_throw_stmt (tree);
 969 extern void objc_begin_try_stmt (location_t, tree);
 970 extern tree objc_finish_try_stmt (void);
 971 extern void objc_begin_catch_clause (tree);
 972 extern void objc_finish_catch_clause (void);
 973 extern void objc_build_finally_clause (location_t, tree);
 974 extern tree objc_build_synchronized (location_t, tree, tree);
 975 extern int objc_static_init_needed_p (void);
 976 extern tree objc_generate_static_init_call (tree);
 977 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
 978
 979 /* The following are provided by the C and C++ front-ends, and called by
 980    ObjC/ObjC++.  */
 981 extern void *objc_get_current_scope (void);
 982 extern void objc_mark_locals_volatile (void *);
 983
 984 /* In c-ppoutput.c  */
 985 extern void init_pp_output (FILE *);
 986 extern void preprocess_file (cpp_reader *);
 987 extern void pp_file_change (const struct line_map *);
 988 extern void pp_dir_change (cpp_reader *, const char *);
 989 extern bool check_missing_format_attribute (tree, tree);
 990
 991 /* In c-omp.c  */
 992 extern tree c_finish_omp_master (tree);
 993 extern tree c_finish_omp_critical (tree, tree);
 994 extern tree c_finish_omp_ordered (tree);
 995 extern void c_finish_omp_barrier (void);
 996 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
 997 extern void c_finish_omp_flush (void);
 998 extern void c_finish_omp_taskwait (void);
 999 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1000 extern void c_split_parallel_clauses (tree, tree *, tree *);
1001 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1002
1003 /* Not in c-omp.c; provided by the front end.  */
1004 extern bool c_omp_sharing_predetermined (tree);
1005 extern tree c_omp_remap_decl (tree, bool);
1006
1007 /* In order for the format checking to accept the C frontend
1008    diagnostic framework extensions, you must include this file before
1009    toplev.h, not after.  The C front end formats are a subset of those
1010    for C++, so they are the appropriate set to use in common code;
1011    cp-tree.h overrides this for C++.  */
1012 #ifndef GCC_DIAG_STYLE
1013 #define GCC_DIAG_STYLE __gcc_cdiag__
1014 #endif
1015
1016 #endif /* ! GCC_C_COMMON_H */