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, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, 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    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  34       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  35    2: unused
  36    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  37    4: unused
  38 */
  39
  40 /* Reserved identifiers.  This is the union of all the keywords for C,
  41    C++, and Objective-C.  All the type modifiers have to be in one
  42    block at the beginning, because they are used as mask bits.  There
  43    are 27 type modifiers; if we add many more we will have to redesign
  44    the mask mechanism.  */
  45
  46 enum rid
  47 {
  48   /* Modifiers: */
  49   /* C, in empirical order of frequency.  */
  50   RID_STATIC = 0,
  51   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  52   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  53   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  54
  55   /* C extensions */
  56   RID_COMPLEX, RID_THREAD,
  57
  58   /* C++ */
  59   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  60
  61   /* ObjC */
  62   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  63
  64   /* C */
  65   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  66   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  67   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  68   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  69   RID_SIZEOF,
  70
  71   /* C extensions */
  72   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  73   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
  74   RID_TYPES_COMPATIBLE_P,
  75   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
  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,
  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,
 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_STATIC_ASSERT,
 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_WCHAR_TYPE,
 147     CTI_SIGNED_WCHAR_TYPE,
 148     CTI_UNSIGNED_WCHAR_TYPE,
 149     CTI_WINT_TYPE,
 150     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 151     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 152     CTI_INTMAX_TYPE,
 153     CTI_UINTMAX_TYPE,
 154     CTI_WIDEST_INT_LIT_TYPE,
 155     CTI_WIDEST_UINT_LIT_TYPE,
 156
 157     CTI_CHAR_ARRAY_TYPE,
 158     CTI_WCHAR_ARRAY_TYPE,
 159     CTI_INT_ARRAY_TYPE,
 160     CTI_STRING_TYPE,
 161     CTI_CONST_STRING_TYPE,
 162
 163     /* Type for boolean expressions (bool in C++, int in C).  */
 164     CTI_TRUTHVALUE_TYPE,
 165     CTI_TRUTHVALUE_TRUE,
 166     CTI_TRUTHVALUE_FALSE,
 167
 168     CTI_DEFAULT_FUNCTION_TYPE,
 169
 170     /* These are not types, but we have to look them up all the time.  */
 171     CTI_FUNCTION_NAME_DECL,
 172     CTI_PRETTY_FUNCTION_NAME_DECL,
 173     CTI_C99_FUNCTION_NAME_DECL,
 174     CTI_SAVED_FUNCTION_NAME_DECLS,
 175
 176     CTI_VOID_ZERO,
 177
 178     CTI_NULL,
 179
 180     CTI_MAX
 181 };
 182
 183 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 184
 185 /* Identifier part common to the C front ends.  Inherits from
 186    tree_identifier, despite appearances.  */
 187 struct c_common_identifier GTY(())
 188 {
 189   struct tree_common common;
 190   struct cpp_hashnode node;
 191 };
 192
 193 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 194 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 195 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 196 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 197 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 198 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 199 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 200 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 201 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 202 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 203
 204 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 205 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 206 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 207
 208 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 209 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 210 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 211 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 212 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 213
 214 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 215
 216 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 217 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 218 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 219 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 220
 221 /* A node for `((void) 0)'.  */
 222 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 223
 224 /* The node for C++ `__null'.  */
 225 #define null_node                       c_global_trees[CTI_NULL]
 226
 227 extern GTY(()) tree c_global_trees[CTI_MAX];
 228
 229 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 230    tree for size reasons.  */
 231 struct sorted_fields_type GTY(())
 232 {
 233   int len;
 234   tree GTY((length ("%h.len"))) elts[1];
 235 };
 236
 237 /* Mark which labels are explicitly declared.
 238    These may be shadowed, and may be referenced from nested functions.  */
 239 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 240
 241 typedef enum c_language_kind
 242 {
 243   clk_c         = 0,            /* C90, C94 or C99 */
 244   clk_objc      = 1,            /* clk_c with ObjC features.  */
 245   clk_cxx       = 2,            /* ANSI/ISO C++ */
 246   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 247 }
 248 c_language_kind;
 249
 250 /* To test for a specific language use c_language, defined by each
 251    front end.  For "ObjC features" or "not C++" use the macros.  */
 252 extern c_language_kind c_language;
 253
 254 #define c_dialect_cxx()         (c_language & clk_cxx)
 255 #define c_dialect_objc()        (c_language & clk_objc)
 256
 257 extern bool lang_fortran;
 258
 259 /* Information about a statement tree.  */
 260
 261 struct stmt_tree_s GTY(()) {
 262   /* The current statement list being collected.  */
 263   tree x_cur_stmt_list;
 264
 265   /* In C++, Nonzero if we should treat statements as full
 266      expressions.  In particular, this variable is no-zero if at the
 267      end of a statement we should destroy any temporaries created
 268      during that statement.  Similarly, if, at the end of a block, we
 269      should destroy any local variables in this block.  Normally, this
 270      variable is nonzero, since those are the normal semantics of
 271      C++.
 272
 273      However, in order to represent aggregate initialization code as
 274      tree structure, we use statement-expressions.  The statements
 275      within the statement expression should not result in cleanups
 276      being run until the entire enclosing statement is complete.
 277
 278      This flag has no effect in C.  */
 279   int stmts_are_full_exprs_p;
 280 };
 281
 282 typedef struct stmt_tree_s *stmt_tree;
 283
 284 /* Global state pertinent to the current function.  Some C dialects
 285    extend this structure with additional fields.  */
 286
 287 struct c_language_function GTY(()) {
 288   /* While we are parsing the function, this contains information
 289      about the statement-tree that we are building.  */
 290   struct stmt_tree_s x_stmt_tree;
 291 };
 292
 293 /* When building a statement-tree, this is the current statement list
 294    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 295    statement list.  */
 296
 297 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 298
 299 /* Language-specific hooks.  */
 300
 301 /* Callback that determines if it's ok for a function to have no
 302    noreturn attribute.  */
 303 extern int (*lang_missing_noreturn_ok_p) (tree);
 304
 305 /* If non-NULL, this function is called after a precompile header file
 306    is loaded.  */
 307 extern void (*lang_post_pch_load) (void);
 308
 309 extern void push_file_scope (void);
 310 extern void pop_file_scope (void);
 311 extern stmt_tree current_stmt_tree (void);
 312 extern tree push_stmt_list (void);
 313 extern tree pop_stmt_list (tree);
 314 extern tree add_stmt (tree);
 315 extern void push_cleanup (tree, tree, bool);
 316 extern tree pushdecl_top_level (tree);
 317 extern tree pushdecl (tree);
 318 extern tree build_modify_expr (tree, enum tree_code, tree);
 319 extern tree build_indirect_ref (tree, const char *);
 320
 321 extern int c_expand_decl (tree);
 322
 323 extern int field_decl_cmp (const void *, const void *);
 324 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 325                                   void *);
 326 extern bool has_c_linkage (tree decl);
 327 \f
 328 /* Switches common to the C front ends.  */
 329
 330 /* Nonzero if prepreprocessing only.  */
 331
 332 extern int flag_preprocess_only;
 333
 334 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 335    calls will be used in ObjC; passing nil receivers to such calls
 336    will most likely result in crashes.  */
 337 extern int flag_nil_receivers;
 338
 339 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 340    @try, etc.) in source code.  */
 341 extern int flag_objc_exceptions;
 342
 343 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 344 extern int flag_objc_sjlj_exceptions;
 345
 346 /* Nonzero means that code generation will be altered to support
 347    "zero-link" execution.  This currently affects ObjC only, but may
 348    affect other languages in the future.  */
 349 extern int flag_zero_link;
 350
 351 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 352    unit.  It will inform the ObjC runtime that class definition(s) herein
 353    contained are to replace one(s) previously loaded.  */
 354 extern int flag_replace_objc_classes;
 355
 356 /* Nonzero means don't output line number information.  */
 357
 358 extern char flag_no_line_commands;
 359
 360 /* Nonzero causes -E output not to be done, but directives such as
 361    #define that have side effects are still obeyed.  */
 362
 363 extern char flag_no_output;
 364
 365 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 366    'N' of the command line switch.  */
 367
 368 extern char flag_dump_macros;
 369
 370 /* Nonzero means pass #include lines through to the output.  */
 371
 372 extern char flag_dump_includes;
 373
 374 /* Nonzero means process PCH files while preprocessing.  */
 375
 376 extern bool flag_pch_preprocess;
 377
 378 /* The file name to which we should write a precompiled header, or
 379    NULL if no header will be written in this compile.  */
 380
 381 extern const char *pch_file;
 382
 383 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 384    user's namespace.  */
 385
 386 extern int flag_iso;
 387
 388 /* Nonzero if -undef was given.  It suppresses target built-in macros
 389    and assertions.  */
 390
 391 extern int flag_undef;
 392
 393 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 394
 395 extern int flag_no_builtin;
 396
 397 /* Nonzero means don't recognize the non-ANSI builtin functions.
 398    -ansi sets this.  */
 399
 400 extern int flag_no_nonansi_builtin;
 401
 402 /* Nonzero means give `double' the same size as `float'.  */
 403
 404 extern int flag_short_double;
 405
 406 /* Nonzero means give `wchar_t' the same size as `short'.  */
 407
 408 extern int flag_short_wchar;
 409
 410 /* Nonzero means allow implicit conversions between vectors with
 411    differing numbers of subparts and/or differing element types.  */
 412 extern int flag_lax_vector_conversions;
 413
 414 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 415 extern int flag_ms_extensions;
 416
 417 /* Nonzero means don't recognize the keyword `asm'.  */
 418
 419 extern int flag_no_asm;
 420
 421 /* Nonzero means give string constants the type `const char *', as mandated
 422    by the standard.  */
 423
 424 extern int flag_const_strings;
 425
 426 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 427
 428 extern int flag_signed_bitfields;
 429
 430 /* Warn about #pragma directives that are not recognized.  */
 431
 432 extern int warn_unknown_pragmas; /* Tri state variable.  */
 433
 434 /* Warn about format/argument anomalies in calls to formatted I/O functions
 435    (*printf, *scanf, strftime, strfmon, etc.).  */
 436
 437 extern int warn_format;
 438
 439
 440 /* C/ObjC language option variables.  */
 441
 442
 443 /* Nonzero means allow type mismatches in conditional expressions;
 444    just make their values `void'.  */
 445
 446 extern int flag_cond_mismatch;
 447
 448 /* Nonzero means enable C89 Amendment 1 features.  */
 449
 450 extern int flag_isoc94;
 451
 452 /* Nonzero means use the ISO C99 dialect of C.  */
 453
 454 extern int flag_isoc99;
 455
 456 /* Nonzero means that we have builtin functions, and main is an int.  */
 457
 458 extern int flag_hosted;
 459
 460 /* Warn if main is suspicious.  */
 461
 462 extern int warn_main;
 463
 464
 465 /* ObjC language option variables.  */
 466
 467
 468 /* Open and close the file for outputting class declarations, if
 469    requested (ObjC).  */
 470
 471 extern int flag_gen_declaration;
 472
 473 /* Tells the compiler that this is a special run.  Do not perform any
 474    compiling, instead we are to test some platform dependent features
 475    and output a C header file with appropriate definitions.  */
 476
 477 extern int print_struct_values;
 478
 479 /* ???.  Undocumented.  */
 480
 481 extern const char *constant_string_class_name;
 482
 483
 484 /* C++ language option variables.  */
 485
 486
 487 /* Nonzero means don't recognize any extension keywords.  */
 488
 489 extern int flag_no_gnu_keywords;
 490
 491 /* Nonzero means do emit exported implementations of functions even if
 492    they can be inlined.  */
 493
 494 extern int flag_implement_inlines;
 495
 496 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 497
 498 extern int flag_implicit_templates;
 499
 500 /* Nonzero means that implicit instantiations of inline templates will be
 501    emitted if needed, even if instantiations of non-inline templates
 502    aren't.  */
 503
 504 extern int flag_implicit_inline_templates;
 505
 506 /* Nonzero means generate separate instantiation control files and
 507    juggle them at link time.  */
 508
 509 extern int flag_use_repository;
 510
 511 /* Nonzero if we want to issue diagnostics that the standard says are not
 512    required.  */
 513
 514 extern int flag_optional_diags;
 515
 516 /* Nonzero means we should attempt to elide constructors when possible.  */
 517
 518 extern int flag_elide_constructors;
 519
 520 /* Nonzero means that member functions defined in class scope are
 521    inline by default.  */
 522
 523 extern int flag_default_inline;
 524
 525 /* Controls whether compiler generates 'type descriptor' that give
 526    run-time type information.  */
 527
 528 extern int flag_rtti;
 529
 530 /* Nonzero if we want to conserve space in the .o files.  We do this
 531    by putting uninitialized data and runtime initialized data into
 532    .common instead of .data at the expense of not flagging multiple
 533    definitions.  */
 534
 535 extern int flag_conserve_space;
 536
 537 /* Nonzero if we want to obey access control semantics.  */
 538
 539 extern int flag_access_control;
 540
 541 /* Nonzero if we want to check the return value of new and avoid calling
 542    constructors if it is a null pointer.  */
 543
 544 extern int flag_check_new;
 545
 546 /* The supported C++ dialects.  */
 547
 548 enum cxx_dialect {
 549   /* C++98  */
 550   cxx98,
 551   /* Experimental features that are likely to become part of
 552      C++0x.  */
 553   cxx0x
 554 };
 555
 556 /* The C++ dialect being used. C++98 is the default.  */
 557 extern enum cxx_dialect cxx_dialect;
 558
 559 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 560    initialization variables.
 561    0: Old rules, set by -fno-for-scope.
 562    2: New ISO rules, set by -ffor-scope.
 563    1: Try to implement new ISO rules, but with backup compatibility
 564    (and warnings).  This is the default, for now.  */
 565
 566 extern int flag_new_for_scope;
 567
 568 /* Nonzero if we want to emit defined symbols with common-like linkage as
 569    weak symbols where possible, in order to conform to C++ semantics.
 570    Otherwise, emit them as local symbols.  */
 571
 572 extern int flag_weak;
 573
 574 /* 0 means we want the preprocessor to not emit line directives for
 575    the current working directory.  1 means we want it to do it.  -1
 576    means we should decide depending on whether debugging information
 577    is being emitted or not.  */
 578
 579 extern int flag_working_directory;
 580
 581 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 582    destructors for local statics and global objects.  */
 583
 584 extern int flag_use_cxa_atexit;
 585
 586 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
 587    logic.  */
 588
 589 extern int flag_use_cxa_get_exception_ptr;
 590
 591 /* Nonzero means make the default pedwarns warnings instead of errors.
 592    The value of this flag is ignored if -pedantic is specified.  */
 593
 594 extern int flag_permissive;
 595
 596 /* Nonzero means to implement standard semantics for exception
 597    specifications, calling unexpected if an exception is thrown that
 598    doesn't match the specification.  Zero means to treat them as
 599    assertions and optimize accordingly, but not check them.  */
 600
 601 extern int flag_enforce_eh_specs;
 602
 603 /* Nonzero (the default) means to generate thread-safe code for
 604    initializing local statics.  */
 605
 606 extern int flag_threadsafe_statics;
 607
 608 /* Nonzero means warn about implicit declarations.  */
 609
 610 extern int warn_implicit;
 611
 612 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 613    with GCC this doesn't matter as __null is guaranteed to have the right
 614    size.  */
 615
 616 extern int warn_strict_null_sentinel;
 617
 618 /* Maximum template instantiation depth.  This limit is rather
 619    arbitrary, but it exists to limit the time it takes to notice
 620    infinite template instantiations.  */
 621
 622 extern int max_tinst_depth;
 623
 624 /* Nonzero means the expression being parsed will never be evaluated.
 625    This is a count, since unevaluated expressions can nest.  */
 626
 627 extern int skip_evaluation;
 628
 629 /* C types are partitioned into three subsets: object, function, and
 630    incomplete types.  */
 631 #define C_TYPE_OBJECT_P(type) \
 632   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 633
 634 #define C_TYPE_INCOMPLETE_P(type) \
 635   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 636
 637 #define C_TYPE_FUNCTION_P(type) \
 638   (TREE_CODE (type) == FUNCTION_TYPE)
 639
 640 /* For convenience we define a single macro to identify the class of
 641    object or incomplete types.  */
 642 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 643   (!C_TYPE_FUNCTION_P (type))
 644
 645 /* Attribute table common to the C front ends.  */
 646 extern const struct attribute_spec c_common_attribute_table[];
 647 extern const struct attribute_spec c_common_format_attribute_table[];
 648
 649 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 650    ID is the identifier to use, NAME is the string.
 651    TYPE_DEP indicates whether it depends on type of the function or not
 652    (i.e. __PRETTY_FUNCTION__).  */
 653
 654 extern tree (*make_fname_decl) (tree, int);
 655
 656 extern tree identifier_global_value (tree);
 657 extern void record_builtin_type (enum rid, const char *, tree);
 658 extern tree build_void_list_node (void);
 659 extern void start_fname_decls (void);
 660 extern void finish_fname_decls (void);
 661 extern const char *fname_as_string (int);
 662 extern tree fname_decl (unsigned, tree);
 663
 664 extern void check_function_arguments (tree, int, tree *, tree);
 665 extern void check_function_arguments_recurse (void (*)
 666                                               (void *, tree,
 667                                                unsigned HOST_WIDE_INT),
 668                                               void *, tree,
 669                                               unsigned HOST_WIDE_INT);
 670 extern void check_function_format (tree, int, tree *);
 671 extern void set_Wformat (int);
 672 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 673 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 674 extern int c_common_handle_option (size_t code, const char *arg, int value);
 675 extern bool c_common_missing_argument (const char *opt, size_t code);
 676 extern tree c_common_type_for_mode (enum machine_mode, int);
 677 extern tree c_common_type_for_size (unsigned 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 (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 bool strict_aliasing_warning (tree, tree, tree);
 694 extern void empty_if_body_warning (tree, tree);
 695 extern void warnings_for_convert_and_check (tree, tree, tree);
 696 extern tree convert_and_check (tree, tree);
 697 extern void overflow_warning (tree);
 698 extern void warn_logical_operator (enum tree_code, tree, tree);
 699 extern void check_main_parameter_types (tree decl);
 700 extern bool c_determine_visibility (tree);
 701 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 702
 703 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 704 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 705
 706 /* Subroutine of build_binary_op, used for comparison operations.
 707    See if the operands have both been converted from subword integer types
 708    and, if so, perhaps change them both back to their original type.  */
 709 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 710
 711 extern tree pointer_int_sum (enum tree_code, tree, tree);
 712 extern unsigned int min_precision (tree, int);
 713
 714 /* Add qualifiers to a type, in the fashion for C.  */
 715 extern tree c_build_qualified_type (tree, int);
 716
 717 /* Build tree nodes and builtin functions common to both C and C++ language
 718    frontends.  */
 719 extern void c_common_nodes_and_builtins (void);
 720
 721 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 722
 723 extern void disable_builtin_function (const char *);
 724
 725 extern void set_compound_literal_name (tree decl);
 726
 727 extern tree build_va_arg (tree, tree);
 728
 729 extern unsigned int c_common_init_options (unsigned int, const char **);
 730 extern bool c_common_post_options (const char **);
 731 extern bool c_common_init (void);
 732 extern void c_common_finish (void);
 733 extern void c_common_parse_file (int);
 734 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 735 extern void c_register_builtin_type (tree, const char*);
 736 extern bool c_promoting_integer_type_p (tree);
 737 extern int self_promoting_args_p (tree);
 738 extern tree strip_array_types (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 (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 (tree t1, tree t2, bool emit_lax_note);
 835
 836 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 837 extern void c_expand_body (tree);
 838
 839 extern tree c_staticp (tree);
 840
 841 extern void init_c_lex (void);
 842
 843 extern void c_cpp_builtins (cpp_reader *);
 844
 845 /* Positive if an implicit `extern "C"' scope has just been entered;
 846    negative if such a scope has just been exited.  */
 847 extern GTY(()) int pending_lang_change;
 848
 849 /* Information recorded about each file examined during compilation.  */
 850
 851 struct c_fileinfo
 852 {
 853   int time;     /* Time spent in the file.  */
 854
 855   /* Flags used only by C++.
 856      INTERFACE_ONLY nonzero means that we are in an "interface" section
 857      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 858      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 859      INTERFACE_ONLY is zero, it means that we are responsible for
 860      exporting definitions that others might need.  */
 861   short interface_only;
 862   short interface_unknown;
 863 };
 864
 865 struct c_fileinfo *get_fileinfo (const char *);
 866 extern void dump_time_statistics (void);
 867
 868 extern bool c_dump_tree (void *, tree);
 869
 870 extern void c_warn_unused_result (tree *);
 871
 872 extern void verify_sequence_points (tree);
 873
 874 extern tree fold_offsetof (tree, tree);
 875
 876 /* Places where an lvalue, or modifiable lvalue, may be required.
 877    Used to select diagnostic messages in lvalue_error and
 878    readonly_error.  */
 879 enum lvalue_use {
 880   lv_assign,
 881   lv_increment,
 882   lv_decrement,
 883   lv_addressof,
 884   lv_asm
 885 };
 886
 887 extern void lvalue_error (enum lvalue_use);
 888
 889 extern int complete_array_type (tree *, tree, bool);
 890
 891 extern tree builtin_type_for_size (int, bool);
 892
 893 extern void warn_array_subscript_with_type_char (tree);
 894 extern void warn_about_parentheses (enum tree_code, enum tree_code,
 895                                     enum tree_code);
 896 extern void warn_for_unused_label (tree label);
 897 extern void warn_for_div_by_zero (tree divisor);
 898
 899
 900 /* In c-gimplify.c  */
 901 extern void c_genericize (tree);
 902 extern int c_gimplify_expr (tree *, tree *, tree *);
 903 extern tree c_build_bind_expr (tree, tree);
 904
 905 /* In c-pch.c  */
 906 extern void pch_init (void);
 907 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 908 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 909                                const char *orig);
 910 extern void c_common_write_pch (void);
 911 extern void c_common_no_more_pch (void);
 912 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
 913 extern void c_common_print_pch_checksum (FILE *f);
 914
 915 /* In *-checksum.c */
 916 extern const unsigned char executable_checksum[16];
 917
 918 extern void builtin_define_with_value (const char *, const char *, int);
 919 extern void c_stddef_cpp_builtins (void);
 920 extern void fe_file_change (const struct line_map *);
 921 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 922
 923 /* Objective-C / Objective-C++ entry points.  */
 924
 925 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 926    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 927 extern tree objc_is_class_name (tree);
 928 extern tree objc_is_object_ptr (tree);
 929 extern void objc_check_decl (tree);
 930 extern int objc_is_reserved_word (tree);
 931 extern bool objc_compare_types (tree, tree, int, tree);
 932 extern void objc_volatilize_decl (tree);
 933 extern bool objc_type_quals_match (tree, tree);
 934 extern tree objc_rewrite_function_call (tree, tree);
 935 extern tree objc_message_selector (void);
 936 extern tree objc_lookup_ivar (tree, tree);
 937 extern void objc_clear_super_receiver (void);
 938 extern int objc_is_public (tree, tree);
 939 extern tree objc_is_id (tree);
 940 extern void objc_declare_alias (tree, tree);
 941 extern void objc_declare_class (tree);
 942 extern void objc_declare_protocols (tree);
 943 extern tree objc_build_message_expr (tree);
 944 extern tree objc_finish_message_expr (tree, tree, tree);
 945 extern tree objc_build_selector_expr (tree);
 946 extern tree objc_build_protocol_expr (tree);
 947 extern tree objc_build_encode_expr (tree);
 948 extern tree objc_build_string_object (tree);
 949 extern tree objc_get_protocol_qualified_type (tree, tree);
 950 extern tree objc_get_class_reference (tree);
 951 extern tree objc_get_class_ivars (tree);
 952 extern void objc_start_class_interface (tree, tree, tree);
 953 extern void objc_start_category_interface (tree, tree, tree);
 954 extern void objc_start_protocol (tree, tree);
 955 extern void objc_continue_interface (void);
 956 extern void objc_finish_interface (void);
 957 extern void objc_start_class_implementation (tree, tree);
 958 extern void objc_start_category_implementation (tree, tree);
 959 extern void objc_continue_implementation (void);
 960 extern void objc_finish_implementation (void);
 961 extern void objc_set_visibility (int);
 962 extern void objc_set_method_type (enum tree_code);
 963 extern tree objc_build_method_signature (tree, tree, tree, bool);
 964 extern void objc_add_method_declaration (tree);
 965 extern void objc_start_method_definition (tree);
 966 extern void objc_finish_method_definition (tree);
 967 extern void objc_add_instance_variable (tree);
 968 extern tree objc_build_keyword_decl (tree, tree, tree);
 969 extern tree objc_build_throw_stmt (tree);
 970 extern void objc_begin_try_stmt (location_t, tree);
 971 extern tree objc_finish_try_stmt (void);
 972 extern void objc_begin_catch_clause (tree);
 973 extern void objc_finish_catch_clause (void);
 974 extern void objc_build_finally_clause (location_t, tree);
 975 extern tree objc_build_synchronized (location_t, tree, tree);
 976 extern int objc_static_init_needed_p (void);
 977 extern tree objc_generate_static_init_call (tree);
 978 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
 979
 980 /* The following are provided by the C and C++ front-ends, and called by
 981    ObjC/ObjC++.  */
 982 extern void *objc_get_current_scope (void);
 983 extern void objc_mark_locals_volatile (void *);
 984
 985 /* In c-ppoutput.c  */
 986 extern void init_pp_output (FILE *);
 987 extern void preprocess_file (cpp_reader *);
 988 extern void pp_file_change (const struct line_map *);
 989 extern void pp_dir_change (cpp_reader *, const char *);
 990 extern bool check_missing_format_attribute (tree, tree);
 991
 992 /* In c-omp.c  */
 993 extern tree c_finish_omp_master (tree);
 994 extern tree c_finish_omp_critical (tree, tree);
 995 extern tree c_finish_omp_ordered (tree);
 996 extern void c_finish_omp_barrier (void);
 997 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
 998 extern void c_finish_omp_flush (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 */