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,
  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_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 /* If non-NULL, this function is called after a precompile header file
 302    is loaded.  */
 303 extern void (*lang_post_pch_load) (void);
 304
 305 extern void push_file_scope (void);
 306 extern void pop_file_scope (void);
 307 extern stmt_tree current_stmt_tree (void);
 308 extern tree push_stmt_list (void);
 309 extern tree pop_stmt_list (tree);
 310 extern tree add_stmt (tree);
 311 extern void push_cleanup (tree, tree, bool);
 312 extern tree pushdecl_top_level (tree);
 313 extern tree pushdecl (tree);
 314 extern tree build_modify_expr (tree, enum tree_code, tree);
 315 extern tree build_indirect_ref (tree, const char *);
 316
 317 extern int c_expand_decl (tree);
 318
 319 extern int field_decl_cmp (const void *, const void *);
 320 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 321                                   void *);
 322 extern bool has_c_linkage (const_tree decl);
 323 \f
 324 /* Switches common to the C front ends.  */
 325
 326 /* Nonzero if prepreprocessing only.  */
 327
 328 extern int flag_preprocess_only;
 329
 330 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 331    calls will be used in ObjC; passing nil receivers to such calls
 332    will most likely result in crashes.  */
 333 extern int flag_nil_receivers;
 334
 335 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 336    @try, etc.) in source code.  */
 337 extern int flag_objc_exceptions;
 338
 339 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 340 extern int flag_objc_sjlj_exceptions;
 341
 342 /* Nonzero means that code generation will be altered to support
 343    "zero-link" execution.  This currently affects ObjC only, but may
 344    affect other languages in the future.  */
 345 extern int flag_zero_link;
 346
 347 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 348    unit.  It will inform the ObjC runtime that class definition(s) herein
 349    contained are to replace one(s) previously loaded.  */
 350 extern int flag_replace_objc_classes;
 351
 352 /* Nonzero means don't output line number information.  */
 353
 354 extern char flag_no_line_commands;
 355
 356 /* Nonzero causes -E output not to be done, but directives such as
 357    #define that have side effects are still obeyed.  */
 358
 359 extern char flag_no_output;
 360
 361 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 362    'N' of the command line switch.  */
 363
 364 extern char flag_dump_macros;
 365
 366 /* Nonzero means pass #include lines through to the output.  */
 367
 368 extern char flag_dump_includes;
 369
 370 /* Nonzero means process PCH files while preprocessing.  */
 371
 372 extern bool flag_pch_preprocess;
 373
 374 /* The file name to which we should write a precompiled header, or
 375    NULL if no header will be written in this compile.  */
 376
 377 extern const char *pch_file;
 378
 379 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 380    user's namespace.  */
 381
 382 extern int flag_iso;
 383
 384 /* Nonzero if -undef was given.  It suppresses target built-in macros
 385    and assertions.  */
 386
 387 extern int flag_undef;
 388
 389 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 390
 391 extern int flag_no_builtin;
 392
 393 /* Nonzero means don't recognize the non-ANSI builtin functions.
 394    -ansi sets this.  */
 395
 396 extern int flag_no_nonansi_builtin;
 397
 398 /* Nonzero means give `double' the same size as `float'.  */
 399
 400 extern int flag_short_double;
 401
 402 /* Nonzero means give `wchar_t' the same size as `short'.  */
 403
 404 extern int flag_short_wchar;
 405
 406 /* Nonzero means allow implicit conversions between vectors with
 407    differing numbers of subparts and/or differing element types.  */
 408 extern int flag_lax_vector_conversions;
 409
 410 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 411 extern int flag_ms_extensions;
 412
 413 /* Nonzero means don't recognize the keyword `asm'.  */
 414
 415 extern int flag_no_asm;
 416
 417 /* Nonzero means give string constants the type `const char *', as mandated
 418    by the standard.  */
 419
 420 extern int flag_const_strings;
 421
 422 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 423
 424 extern int flag_signed_bitfields;
 425
 426 /* Warn about #pragma directives that are not recognized.  */
 427
 428 extern int warn_unknown_pragmas; /* Tri state variable.  */
 429
 430 /* Warn about format/argument anomalies in calls to formatted I/O functions
 431    (*printf, *scanf, strftime, strfmon, etc.).  */
 432
 433 extern int warn_format;
 434
 435
 436 /* C/ObjC language option variables.  */
 437
 438
 439 /* Nonzero means allow type mismatches in conditional expressions;
 440    just make their values `void'.  */
 441
 442 extern int flag_cond_mismatch;
 443
 444 /* Nonzero means enable C89 Amendment 1 features.  */
 445
 446 extern int flag_isoc94;
 447
 448 /* Nonzero means use the ISO C99 dialect of C.  */
 449
 450 extern int flag_isoc99;
 451
 452 /* Nonzero means that we have builtin functions, and main is an int.  */
 453
 454 extern int flag_hosted;
 455
 456 /* Warn if main is suspicious.  */
 457
 458 extern int warn_main;
 459
 460
 461 /* ObjC language option variables.  */
 462
 463
 464 /* Open and close the file for outputting class declarations, if
 465    requested (ObjC).  */
 466
 467 extern int flag_gen_declaration;
 468
 469 /* Tells the compiler that this is a special run.  Do not perform any
 470    compiling, instead we are to test some platform dependent features
 471    and output a C header file with appropriate definitions.  */
 472
 473 extern int print_struct_values;
 474
 475 /* ???.  Undocumented.  */
 476
 477 extern const char *constant_string_class_name;
 478
 479
 480 /* C++ language option variables.  */
 481
 482
 483 /* Nonzero means don't recognize any extension keywords.  */
 484
 485 extern int flag_no_gnu_keywords;
 486
 487 /* Nonzero means do emit exported implementations of functions even if
 488    they can be inlined.  */
 489
 490 extern int flag_implement_inlines;
 491
 492 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 493
 494 extern int flag_implicit_templates;
 495
 496 /* Nonzero means that implicit instantiations of inline templates will be
 497    emitted if needed, even if instantiations of non-inline templates
 498    aren't.  */
 499
 500 extern int flag_implicit_inline_templates;
 501
 502 /* Nonzero means generate separate instantiation control files and
 503    juggle them at link time.  */
 504
 505 extern int flag_use_repository;
 506
 507 /* Nonzero if we want to issue diagnostics that the standard says are not
 508    required.  */
 509
 510 extern int flag_optional_diags;
 511
 512 /* Nonzero means we should attempt to elide constructors when possible.  */
 513
 514 extern int flag_elide_constructors;
 515
 516 /* Nonzero means that member functions defined in class scope are
 517    inline by default.  */
 518
 519 extern int flag_default_inline;
 520
 521 /* Controls whether compiler generates 'type descriptor' that give
 522    run-time type information.  */
 523
 524 extern int flag_rtti;
 525
 526 /* Nonzero if we want to conserve space in the .o files.  We do this
 527    by putting uninitialized data and runtime initialized data into
 528    .common instead of .data at the expense of not flagging multiple
 529    definitions.  */
 530
 531 extern int flag_conserve_space;
 532
 533 /* Nonzero if we want to obey access control semantics.  */
 534
 535 extern int flag_access_control;
 536
 537 /* Nonzero if we want to check the return value of new and avoid calling
 538    constructors if it is a null pointer.  */
 539
 540 extern int flag_check_new;
 541
 542 /* The supported C++ dialects.  */
 543
 544 enum cxx_dialect {
 545   /* C++98  */
 546   cxx98,
 547   /* Experimental features that are likely to become part of
 548      C++0x.  */
 549   cxx0x
 550 };
 551
 552 /* The C++ dialect being used. C++98 is the default.  */
 553 extern enum cxx_dialect cxx_dialect;
 554
 555 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 556    initialization variables.
 557    0: Old rules, set by -fno-for-scope.
 558    2: New ISO rules, set by -ffor-scope.
 559    1: Try to implement new ISO rules, but with backup compatibility
 560    (and warnings).  This is the default, for now.  */
 561
 562 extern int flag_new_for_scope;
 563
 564 /* Nonzero if we want to emit defined symbols with common-like linkage as
 565    weak symbols where possible, in order to conform to C++ semantics.
 566    Otherwise, emit them as local symbols.  */
 567
 568 extern int flag_weak;
 569
 570 /* 0 means we want the preprocessor to not emit line directives for
 571    the current working directory.  1 means we want it to do it.  -1
 572    means we should decide depending on whether debugging information
 573    is being emitted or not.  */
 574
 575 extern int flag_working_directory;
 576
 577 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 578    destructors for local statics and global objects.  */
 579
 580 extern int flag_use_cxa_atexit;
 581
 582 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
 583    logic.  */
 584
 585 extern int flag_use_cxa_get_exception_ptr;
 586
 587 /* Nonzero means make the default pedwarns warnings instead of errors.
 588    The value of this flag is ignored if -pedantic is specified.  */
 589
 590 extern int flag_permissive;
 591
 592 /* Nonzero means to implement standard semantics for exception
 593    specifications, calling unexpected if an exception is thrown that
 594    doesn't match the specification.  Zero means to treat them as
 595    assertions and optimize accordingly, but not check them.  */
 596
 597 extern int flag_enforce_eh_specs;
 598
 599 /* Nonzero (the default) means to generate thread-safe code for
 600    initializing local statics.  */
 601
 602 extern int flag_threadsafe_statics;
 603
 604 /* Nonzero means warn about implicit declarations.  */
 605
 606 extern int warn_implicit;
 607
 608 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 609    with GCC this doesn't matter as __null is guaranteed to have the right
 610    size.  */
 611
 612 extern int warn_strict_null_sentinel;
 613
 614 /* Maximum template instantiation depth.  This limit is rather
 615    arbitrary, but it exists to limit the time it takes to notice
 616    infinite template instantiations.  */
 617
 618 extern int max_tinst_depth;
 619
 620 /* Nonzero means the expression being parsed will never be evaluated.
 621    This is a count, since unevaluated expressions can nest.  */
 622
 623 extern int skip_evaluation;
 624
 625 /* C types are partitioned into three subsets: object, function, and
 626    incomplete types.  */
 627 #define C_TYPE_OBJECT_P(type) \
 628   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 629
 630 #define C_TYPE_INCOMPLETE_P(type) \
 631   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 632
 633 #define C_TYPE_FUNCTION_P(type) \
 634   (TREE_CODE (type) == FUNCTION_TYPE)
 635
 636 /* For convenience we define a single macro to identify the class of
 637    object or incomplete types.  */
 638 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 639   (!C_TYPE_FUNCTION_P (type))
 640
 641 /* Attribute table common to the C front ends.  */
 642 extern const struct attribute_spec c_common_attribute_table[];
 643 extern const struct attribute_spec c_common_format_attribute_table[];
 644
 645 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 646    ID is the identifier to use, NAME is the string.
 647    TYPE_DEP indicates whether it depends on type of the function or not
 648    (i.e. __PRETTY_FUNCTION__).  */
 649
 650 extern tree (*make_fname_decl) (tree, int);
 651
 652 extern tree identifier_global_value (tree);
 653 extern void record_builtin_type (enum rid, const char *, tree);
 654 extern tree build_void_list_node (void);
 655 extern void start_fname_decls (void);
 656 extern void finish_fname_decls (void);
 657 extern const char *fname_as_string (int);
 658 extern tree fname_decl (unsigned, tree);
 659
 660 extern void check_function_arguments (tree, int, tree *, tree);
 661 extern void check_function_arguments_recurse (void (*)
 662                                               (void *, tree,
 663                                                unsigned HOST_WIDE_INT),
 664                                               void *, tree,
 665                                               unsigned HOST_WIDE_INT);
 666 extern void check_function_format (tree, int, tree *);
 667 extern void set_Wformat (int);
 668 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 669 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 670 extern int c_common_handle_option (size_t code, const char *arg, int value);
 671 extern bool c_common_missing_argument (const char *opt, size_t code);
 672 extern tree c_common_type_for_mode (enum machine_mode, int);
 673 extern tree c_common_type_for_size (unsigned int, int);
 674 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 675                                                 int, int);
 676 extern tree c_common_unsigned_type (tree);
 677 extern tree c_common_signed_type (tree);
 678 extern tree c_common_signed_or_unsigned_type (int, tree);
 679 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 680 extern bool decl_with_nonnull_addr_p (const_tree);
 681 extern tree c_common_truthvalue_conversion (tree);
 682 extern void c_apply_type_quals_to_decl (int, tree);
 683 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 684 extern tree c_alignof_expr (tree);
 685 /* Print an error message for invalid operands to arith operation CODE.
 686    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 687 extern void binary_op_error (enum tree_code, tree, tree);
 688 extern tree fix_string_type (tree);
 689 struct varray_head_tag;
 690 extern void constant_expression_warning (tree);
 691 extern bool strict_aliasing_warning (tree, tree, tree);
 692 extern void empty_if_body_warning (tree, tree);
 693 extern void warnings_for_convert_and_check (tree, tree, tree);
 694 extern tree convert_and_check (tree, tree);
 695 extern void overflow_warning (tree);
 696 extern void warn_logical_operator (enum tree_code, tree, tree);
 697 extern void check_main_parameter_types (tree decl);
 698 extern bool c_determine_visibility (tree);
 699 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 700
 701 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 702 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 703
 704 /* Subroutine of build_binary_op, used for comparison operations.
 705    See if the operands have both been converted from subword integer types
 706    and, if so, perhaps change them both back to their original type.  */
 707 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 708
 709 extern tree pointer_int_sum (enum tree_code, tree, tree);
 710 extern unsigned int min_precision (tree, int);
 711
 712 /* Add qualifiers to a type, in the fashion for C.  */
 713 extern tree c_build_qualified_type (tree, int);
 714
 715 /* Build tree nodes and builtin functions common to both C and C++ language
 716    frontends.  */
 717 extern void c_common_nodes_and_builtins (void);
 718
 719 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 720
 721 extern void disable_builtin_function (const char *);
 722
 723 extern void set_compound_literal_name (tree decl);
 724
 725 extern tree build_va_arg (tree, tree);
 726
 727 extern unsigned int c_common_init_options (unsigned int, const char **);
 728 extern bool c_common_post_options (const char **);
 729 extern bool c_common_init (void);
 730 extern void c_common_finish (void);
 731 extern void c_common_parse_file (int);
 732 extern alias_set_type c_common_get_alias_set (tree);
 733 extern void c_register_builtin_type (tree, const char*);
 734 extern bool c_promoting_integer_type_p (const_tree);
 735 extern int self_promoting_args_p (const_tree);
 736 extern tree strip_array_types (tree);
 737 extern const_tree const_strip_array_types (const_tree);
 738 extern tree strip_pointer_operator (tree);
 739 extern tree strip_pointer_or_array_types (tree);
 740 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 741
 742 /* This is the basic parsing function.  */
 743 extern void c_parse_file (void);
 744 /* This is misnamed, it actually performs end-of-compilation processing.  */
 745 extern void finish_file (void);
 746
 747
 748 /* These macros provide convenient access to the various _STMT nodes.  */
 749
 750 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 751    if a statement expression.  */
 752 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 753   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 754
 755 /* Nonzero if a label has been added to the statement list.  */
 756 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 757   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 758
 759 /* COMPOUND_LITERAL_EXPR accessors.  */
 760 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 761   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 762 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 763   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 764
 765 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 766
 767 enum c_tree_code {
 768   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 769 #include "c-common.def"
 770   LAST_C_TREE_CODE
 771 };
 772
 773 #undef DEFTREECODE
 774
 775 extern int anon_aggr_type_p (const_tree);
 776
 777 /* For a VAR_DECL that is an anonymous union, these are the various
 778    sub-variables that make up the anonymous union.  */
 779 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 780
 781 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 782 #define DECL_C_BIT_FIELD(NODE) \
 783   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 784 #define SET_DECL_C_BIT_FIELD(NODE) \
 785   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 786 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 787   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 788
 789 extern void emit_local_var (tree);
 790 extern tree do_case (tree, tree);
 791 extern tree build_stmt (enum tree_code, ...);
 792 extern tree build_case_label (tree, tree, tree);
 793
 794 /* These functions must be defined by each front-end which implements
 795    a variant of the C language.  They are used in c-common.c.  */
 796
 797 extern tree build_unary_op (enum tree_code, tree, int);
 798 extern tree build_binary_op (enum tree_code, tree, tree, int);
 799 extern tree perform_integral_promotions (tree);
 800
 801 /* These functions must be defined by each front-end which implements
 802    a variant of the C language.  They are used by port files.  */
 803
 804 extern tree default_conversion (tree);
 805
 806 /* Given two integer or real types, return the type for their sum.
 807    Given two compatible ANSI C types, returns the merged type.  */
 808
 809 extern tree common_type (tree, tree);
 810
 811 extern tree decl_constant_value (tree);
 812
 813 /* Handle increment and decrement of boolean types.  */
 814 extern tree boolean_increment (enum tree_code, tree);
 815
 816 extern int case_compare (splay_tree_key, splay_tree_key);
 817
 818 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 819
 820 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 821
 822 extern tree build_function_call (tree, tree);
 823
 824 extern tree resolve_overloaded_builtin (tree, tree);
 825
 826 extern tree finish_label_address_expr (tree);
 827
 828 /* Same function prototype, but the C and C++ front ends have
 829    different implementations.  Used in c-common.c.  */
 830 extern tree lookup_label (tree);
 831 extern tree lookup_name (tree);
 832
 833 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 834
 835 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 836 extern void c_expand_body (tree);
 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 tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
 999 extern void c_split_parallel_clauses (tree, tree *, tree *);
1000 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1001
1002 /* Not in c-omp.c; provided by the front end.  */
1003 extern bool c_omp_sharing_predetermined (tree);
1004 extern tree c_omp_remap_decl (tree, bool);
1005
1006 /* In order for the format checking to accept the C frontend
1007    diagnostic framework extensions, you must include this file before
1008    toplev.h, not after.  The C front end formats are a subset of those
1009    for C++, so they are the appropriate set to use in common code;
1010    cp-tree.h overrides this for C++.  */
1011 #ifndef GCC_DIAG_STYLE
1012 #define GCC_DIAG_STYLE __gcc_cdiag__
1013 #endif
1014
1015 #endif /* ! GCC_C_COMMON_H */