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 /* Information about a statement tree.  */
 258
 259 struct stmt_tree_s GTY(()) {
 260   /* The current statement list being collected.  */
 261   tree x_cur_stmt_list;
 262
 263   /* In C++, Nonzero if we should treat statements as full
 264      expressions.  In particular, this variable is no-zero if at the
 265      end of a statement we should destroy any temporaries created
 266      during that statement.  Similarly, if, at the end of a block, we
 267      should destroy any local variables in this block.  Normally, this
 268      variable is nonzero, since those are the normal semantics of
 269      C++.
 270
 271      However, in order to represent aggregate initialization code as
 272      tree structure, we use statement-expressions.  The statements
 273      within the statement expression should not result in cleanups
 274      being run until the entire enclosing statement is complete.
 275
 276      This flag has no effect in C.  */
 277   int stmts_are_full_exprs_p;
 278 };
 279
 280 typedef struct stmt_tree_s *stmt_tree;
 281
 282 /* Global state pertinent to the current function.  Some C dialects
 283    extend this structure with additional fields.  */
 284
 285 struct c_language_function GTY(()) {
 286   /* While we are parsing the function, this contains information
 287      about the statement-tree that we are building.  */
 288   struct stmt_tree_s x_stmt_tree;
 289 };
 290
 291 /* When building a statement-tree, this is the current statement list
 292    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 293    statement list.  */
 294
 295 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 296
 297 /* Language-specific hooks.  */
 298
 299 /* Callback that determines if it's ok for a function to have no
 300    noreturn attribute.  */
 301 extern int (*lang_missing_noreturn_ok_p) (tree);
 302
 303 /* If non-NULL, this function is called after a precompile header file
 304    is loaded.  */
 305 extern void (*lang_post_pch_load) (void);
 306
 307 extern void push_file_scope (void);
 308 extern void pop_file_scope (void);
 309 extern stmt_tree current_stmt_tree (void);
 310 extern tree push_stmt_list (void);
 311 extern tree pop_stmt_list (tree);
 312 extern tree add_stmt (tree);
 313 extern void push_cleanup (tree, tree, bool);
 314 extern tree pushdecl_top_level (tree);
 315 extern tree pushdecl (tree);
 316 extern tree build_modify_expr (tree, enum tree_code, tree);
 317 extern tree build_indirect_ref (tree, const char *);
 318
 319 extern int c_expand_decl (tree);
 320
 321 extern int field_decl_cmp (const void *, const void *);
 322 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 323                                   void *);
 324 extern bool has_c_linkage (tree decl);
 325 \f
 326 /* Switches common to the C front ends.  */
 327
 328 /* Nonzero if prepreprocessing only.  */
 329
 330 extern int flag_preprocess_only;
 331
 332 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 333    calls will be used in ObjC; passing nil receivers to such calls
 334    will most likely result in crashes.  */
 335 extern int flag_nil_receivers;
 336
 337 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 338    @try, etc.) in source code.  */
 339 extern int flag_objc_exceptions;
 340
 341 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 342 extern int flag_objc_sjlj_exceptions;
 343
 344 /* Nonzero means that code generation will be altered to support
 345    "zero-link" execution.  This currently affects ObjC only, but may
 346    affect other languages in the future.  */
 347 extern int flag_zero_link;
 348
 349 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 350    unit.  It will inform the ObjC runtime that class definition(s) herein
 351    contained are to replace one(s) previously loaded.  */
 352 extern int flag_replace_objc_classes;
 353
 354 /* Nonzero means don't output line number information.  */
 355
 356 extern char flag_no_line_commands;
 357
 358 /* Nonzero causes -E output not to be done, but directives such as
 359    #define that have side effects are still obeyed.  */
 360
 361 extern char flag_no_output;
 362
 363 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 364    'N' of the command line switch.  */
 365
 366 extern char flag_dump_macros;
 367
 368 /* Nonzero means pass #include lines through to the output.  */
 369
 370 extern char flag_dump_includes;
 371
 372 /* Nonzero means process PCH files while preprocessing.  */
 373
 374 extern bool flag_pch_preprocess;
 375
 376 /* The file name to which we should write a precompiled header, or
 377    NULL if no header will be written in this compile.  */
 378
 379 extern const char *pch_file;
 380
 381 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 382    user's namespace.  */
 383
 384 extern int flag_iso;
 385
 386 /* Nonzero if -undef was given.  It suppresses target built-in macros
 387    and assertions.  */
 388
 389 extern int flag_undef;
 390
 391 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 392
 393 extern int flag_no_builtin;
 394
 395 /* Nonzero means don't recognize the non-ANSI builtin functions.
 396    -ansi sets this.  */
 397
 398 extern int flag_no_nonansi_builtin;
 399
 400 /* Nonzero means give `double' the same size as `float'.  */
 401
 402 extern int flag_short_double;
 403
 404 /* Nonzero means give `wchar_t' the same size as `short'.  */
 405
 406 extern int flag_short_wchar;
 407
 408 /* Nonzero means allow implicit conversions between vectors with
 409    differing numbers of subparts and/or differing element types.  */
 410 extern int flag_lax_vector_conversions;
 411
 412 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 413 extern int flag_ms_extensions;
 414
 415 /* Nonzero means don't recognize the keyword `asm'.  */
 416
 417 extern int flag_no_asm;
 418
 419 /* Nonzero means give string constants the type `const char *', as mandated
 420    by the standard.  */
 421
 422 extern int flag_const_strings;
 423
 424 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 425
 426 extern int flag_signed_bitfields;
 427
 428 /* Warn about #pragma directives that are not recognized.  */
 429
 430 extern int warn_unknown_pragmas; /* Tri state variable.  */
 431
 432 /* Warn about format/argument anomalies in calls to formatted I/O functions
 433    (*printf, *scanf, strftime, strfmon, etc.).  */
 434
 435 extern int warn_format;
 436
 437
 438 /* C/ObjC language option variables.  */
 439
 440
 441 /* Nonzero means allow type mismatches in conditional expressions;
 442    just make their values `void'.  */
 443
 444 extern int flag_cond_mismatch;
 445
 446 /* Nonzero means enable C89 Amendment 1 features.  */
 447
 448 extern int flag_isoc94;
 449
 450 /* Nonzero means use the ISO C99 dialect of C.  */
 451
 452 extern int flag_isoc99;
 453
 454 /* Nonzero means that we have builtin functions, and main is an int.  */
 455
 456 extern int flag_hosted;
 457
 458 /* Warn if main is suspicious.  */
 459
 460 extern int warn_main;
 461
 462
 463 /* ObjC language option variables.  */
 464
 465
 466 /* Open and close the file for outputting class declarations, if
 467    requested (ObjC).  */
 468
 469 extern int flag_gen_declaration;
 470
 471 /* Tells the compiler that this is a special run.  Do not perform any
 472    compiling, instead we are to test some platform dependent features
 473    and output a C header file with appropriate definitions.  */
 474
 475 extern int print_struct_values;
 476
 477 /* ???.  Undocumented.  */
 478
 479 extern const char *constant_string_class_name;
 480
 481
 482 /* C++ language option variables.  */
 483
 484
 485 /* Nonzero means don't recognize any extension keywords.  */
 486
 487 extern int flag_no_gnu_keywords;
 488
 489 /* Nonzero means do emit exported implementations of functions even if
 490    they can be inlined.  */
 491
 492 extern int flag_implement_inlines;
 493
 494 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 495
 496 extern int flag_implicit_templates;
 497
 498 /* Nonzero means that implicit instantiations of inline templates will be
 499    emitted if needed, even if instantiations of non-inline templates
 500    aren't.  */
 501
 502 extern int flag_implicit_inline_templates;
 503
 504 /* Nonzero means generate separate instantiation control files and
 505    juggle them at link time.  */
 506
 507 extern int flag_use_repository;
 508
 509 /* Nonzero if we want to issue diagnostics that the standard says are not
 510    required.  */
 511
 512 extern int flag_optional_diags;
 513
 514 /* Nonzero means we should attempt to elide constructors when possible.  */
 515
 516 extern int flag_elide_constructors;
 517
 518 /* Nonzero means that member functions defined in class scope are
 519    inline by default.  */
 520
 521 extern int flag_default_inline;
 522
 523 /* Controls whether compiler generates 'type descriptor' that give
 524    run-time type information.  */
 525
 526 extern int flag_rtti;
 527
 528 /* Nonzero if we want to conserve space in the .o files.  We do this
 529    by putting uninitialized data and runtime initialized data into
 530    .common instead of .data at the expense of not flagging multiple
 531    definitions.  */
 532
 533 extern int flag_conserve_space;
 534
 535 /* Nonzero if we want to obey access control semantics.  */
 536
 537 extern int flag_access_control;
 538
 539 /* Nonzero if we want to check the return value of new and avoid calling
 540    constructors if it is a null pointer.  */
 541
 542 extern int flag_check_new;
 543
 544 /* Nonzero if we want to allow the use of experimental features that
 545    are likely to become part of C++0x. */
 546
 547 extern int flag_cpp0x;
 548
 549 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 550    initialization variables.
 551    0: Old rules, set by -fno-for-scope.
 552    2: New ISO rules, set by -ffor-scope.
 553    1: Try to implement new ISO rules, but with backup compatibility
 554    (and warnings).  This is the default, for now.  */
 555
 556 extern int flag_new_for_scope;
 557
 558 /* Nonzero if we want to emit defined symbols with common-like linkage as
 559    weak symbols where possible, in order to conform to C++ semantics.
 560    Otherwise, emit them as local symbols.  */
 561
 562 extern int flag_weak;
 563
 564 /* 0 means we want the preprocessor to not emit line directives for
 565    the current working directory.  1 means we want it to do it.  -1
 566    means we should decide depending on whether debugging information
 567    is being emitted or not.  */
 568
 569 extern int flag_working_directory;
 570
 571 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 572    destructors for local statics and global objects.  */
 573
 574 extern int flag_use_cxa_atexit;
 575
 576 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
 577    logic.  */
 578
 579 extern int flag_use_cxa_get_exception_ptr;
 580
 581 /* Nonzero means make the default pedwarns warnings instead of errors.
 582    The value of this flag is ignored if -pedantic is specified.  */
 583
 584 extern int flag_permissive;
 585
 586 /* Nonzero means to implement standard semantics for exception
 587    specifications, calling unexpected if an exception is thrown that
 588    doesn't match the specification.  Zero means to treat them as
 589    assertions and optimize accordingly, but not check them.  */
 590
 591 extern int flag_enforce_eh_specs;
 592
 593 /* Nonzero (the default) means to generate thread-safe code for
 594    initializing local statics.  */
 595
 596 extern int flag_threadsafe_statics;
 597
 598 /* Nonzero means warn about implicit declarations.  */
 599
 600 extern int warn_implicit;
 601
 602 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 603    with GCC this doesn't matter as __null is guaranteed to have the right
 604    size.  */
 605
 606 extern int warn_strict_null_sentinel;
 607
 608 /* Maximum template instantiation depth.  This limit is rather
 609    arbitrary, but it exists to limit the time it takes to notice
 610    infinite template instantiations.  */
 611
 612 extern int max_tinst_depth;
 613
 614 /* Nonzero means the expression being parsed will never be evaluated.
 615    This is a count, since unevaluated expressions can nest.  */
 616
 617 extern int skip_evaluation;
 618
 619 /* C types are partitioned into three subsets: object, function, and
 620    incomplete types.  */
 621 #define C_TYPE_OBJECT_P(type) \
 622   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 623
 624 #define C_TYPE_INCOMPLETE_P(type) \
 625   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 626
 627 #define C_TYPE_FUNCTION_P(type) \
 628   (TREE_CODE (type) == FUNCTION_TYPE)
 629
 630 /* For convenience we define a single macro to identify the class of
 631    object or incomplete types.  */
 632 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 633   (!C_TYPE_FUNCTION_P (type))
 634
 635 /* Attribute table common to the C front ends.  */
 636 extern const struct attribute_spec c_common_attribute_table[];
 637 extern const struct attribute_spec c_common_format_attribute_table[];
 638
 639 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 640    ID is the identifier to use, NAME is the string.
 641    TYPE_DEP indicates whether it depends on type of the function or not
 642    (i.e. __PRETTY_FUNCTION__).  */
 643
 644 extern tree (*make_fname_decl) (tree, int);
 645
 646 extern tree identifier_global_value (tree);
 647 extern void record_builtin_type (enum rid, const char *, tree);
 648 extern tree build_void_list_node (void);
 649 extern void start_fname_decls (void);
 650 extern void finish_fname_decls (void);
 651 extern const char *fname_as_string (int);
 652 extern tree fname_decl (unsigned, tree);
 653
 654 extern void check_function_arguments (tree, int, tree *, tree);
 655 extern void check_function_arguments_recurse (void (*)
 656                                               (void *, tree,
 657                                                unsigned HOST_WIDE_INT),
 658                                               void *, tree,
 659                                               unsigned HOST_WIDE_INT);
 660 extern void check_function_format (tree, int, tree *);
 661 extern void set_Wformat (int);
 662 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 663 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 664 extern int c_common_handle_option (size_t code, const char *arg, int value);
 665 extern bool c_common_missing_argument (const char *opt, size_t code);
 666 extern tree c_common_type_for_mode (enum machine_mode, int);
 667 extern tree c_common_type_for_size (unsigned int, int);
 668 extern tree c_common_unsigned_type (tree);
 669 extern tree c_common_signed_type (tree);
 670 extern tree c_common_signed_or_unsigned_type (int, tree);
 671 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 672 extern bool decl_with_nonnull_addr_p (tree);
 673 extern tree c_common_truthvalue_conversion (tree);
 674 extern void c_apply_type_quals_to_decl (int, tree);
 675 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 676 extern tree c_alignof_expr (tree);
 677 /* Print an error message for invalid operands to arith operation CODE.
 678    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 679 extern void binary_op_error (enum tree_code);
 680 extern tree fix_string_type (tree);
 681 struct varray_head_tag;
 682 extern void constant_expression_warning (tree);
 683 extern void strict_aliasing_warning (tree, tree, tree);
 684 extern void empty_if_body_warning (tree, tree);
 685 extern void warnings_for_convert_and_check (tree, tree, tree);
 686 extern tree convert_and_check (tree, tree);
 687 extern void overflow_warning (tree);
 688 extern void warn_logical_operator (enum tree_code, tree, tree);
 689 extern void check_main_parameter_types (tree decl);
 690 extern bool c_determine_visibility (tree);
 691 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 692
 693 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 694 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 695
 696 /* Subroutine of build_binary_op, used for comparison operations.
 697    See if the operands have both been converted from subword integer types
 698    and, if so, perhaps change them both back to their original type.  */
 699 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 700
 701 extern tree pointer_int_sum (enum tree_code, tree, tree);
 702 extern unsigned int min_precision (tree, int);
 703
 704 /* Add qualifiers to a type, in the fashion for C.  */
 705 extern tree c_build_qualified_type (tree, int);
 706
 707 /* Build tree nodes and builtin functions common to both C and C++ language
 708    frontends.  */
 709 extern void c_common_nodes_and_builtins (void);
 710
 711 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 712
 713 extern void disable_builtin_function (const char *);
 714
 715 extern void set_compound_literal_name (tree decl);
 716
 717 extern tree build_va_arg (tree, tree);
 718
 719 extern unsigned int c_common_init_options (unsigned int, const char **);
 720 extern bool c_common_post_options (const char **);
 721 extern bool c_common_init (void);
 722 extern void c_common_finish (void);
 723 extern void c_common_parse_file (int);
 724 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 725 extern void c_register_builtin_type (tree, const char*);
 726 extern bool c_promoting_integer_type_p (tree);
 727 extern int self_promoting_args_p (tree);
 728 extern tree strip_array_types (tree);
 729 extern tree strip_pointer_operator (tree);
 730 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 731
 732 /* This is the basic parsing function.  */
 733 extern void c_parse_file (void);
 734 /* This is misnamed, it actually performs end-of-compilation processing.  */
 735 extern void finish_file (void);
 736
 737
 738 /* These macros provide convenient access to the various _STMT nodes.  */
 739
 740 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 741    if a statement expression.  */
 742 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 743   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 744
 745 /* Nonzero if a label has been added to the statement list.  */
 746 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 747   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 748
 749 /* COMPOUND_LITERAL_EXPR accessors.  */
 750 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 751   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 752 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 753   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 754
 755 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 756
 757 enum c_tree_code {
 758   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 759 #include "c-common.def"
 760   LAST_C_TREE_CODE
 761 };
 762
 763 #undef DEFTREECODE
 764
 765 extern int anon_aggr_type_p (tree);
 766
 767 /* For a VAR_DECL that is an anonymous union, these are the various
 768    sub-variables that make up the anonymous union.  */
 769 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 770
 771 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 772 #define DECL_C_BIT_FIELD(NODE) \
 773   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 774 #define SET_DECL_C_BIT_FIELD(NODE) \
 775   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 776 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 777   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 778
 779 extern void emit_local_var (tree);
 780 extern tree do_case (tree, tree);
 781 extern tree build_stmt (enum tree_code, ...);
 782 extern tree build_case_label (tree, tree, tree);
 783
 784 /* These functions must be defined by each front-end which implements
 785    a variant of the C language.  They are used in c-common.c.  */
 786
 787 extern tree build_unary_op (enum tree_code, tree, int);
 788 extern tree build_binary_op (enum tree_code, tree, tree, int);
 789 extern tree perform_integral_promotions (tree);
 790
 791 /* These functions must be defined by each front-end which implements
 792    a variant of the C language.  They are used by port files.  */
 793
 794 extern tree default_conversion (tree);
 795
 796 /* Given two integer or real types, return the type for their sum.
 797    Given two compatible ANSI C types, returns the merged type.  */
 798
 799 extern tree common_type (tree, tree);
 800
 801 extern tree decl_constant_value (tree);
 802
 803 /* Handle increment and decrement of boolean types.  */
 804 extern tree boolean_increment (enum tree_code, tree);
 805
 806 extern int case_compare (splay_tree_key, splay_tree_key);
 807
 808 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 809
 810 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 811
 812 extern tree build_function_call (tree, tree);
 813
 814 extern tree resolve_overloaded_builtin (tree, tree);
 815
 816 extern tree finish_label_address_expr (tree);
 817
 818 /* Same function prototype, but the C and C++ front ends have
 819    different implementations.  Used in c-common.c.  */
 820 extern tree lookup_label (tree);
 821 extern tree lookup_name (tree);
 822
 823 extern bool vector_types_convertible_p (tree t1, tree t2, bool emit_lax_note);
 824
 825 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 826 extern void c_expand_body (tree);
 827
 828 extern tree c_staticp (tree);
 829
 830 extern void init_c_lex (void);
 831
 832 extern void c_cpp_builtins (cpp_reader *);
 833
 834 /* Positive if an implicit `extern "C"' scope has just been entered;
 835    negative if such a scope has just been exited.  */
 836 extern GTY(()) int pending_lang_change;
 837
 838 /* Information recorded about each file examined during compilation.  */
 839
 840 struct c_fileinfo
 841 {
 842   int time;     /* Time spent in the file.  */
 843
 844   /* Flags used only by C++.
 845      INTERFACE_ONLY nonzero means that we are in an "interface" section
 846      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 847      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 848      INTERFACE_ONLY is zero, it means that we are responsible for
 849      exporting definitions that others might need.  */
 850   short interface_only;
 851   short interface_unknown;
 852 };
 853
 854 struct c_fileinfo *get_fileinfo (const char *);
 855 extern void dump_time_statistics (void);
 856
 857 extern bool c_dump_tree (void *, tree);
 858
 859 extern void c_warn_unused_result (tree *);
 860
 861 extern void verify_sequence_points (tree);
 862
 863 extern tree fold_offsetof (tree, tree);
 864
 865 /* Places where an lvalue, or modifiable lvalue, may be required.
 866    Used to select diagnostic messages in lvalue_error and
 867    readonly_error.  */
 868 enum lvalue_use {
 869   lv_assign,
 870   lv_increment,
 871   lv_decrement,
 872   lv_addressof,
 873   lv_asm
 874 };
 875
 876 extern void lvalue_error (enum lvalue_use);
 877
 878 extern int complete_array_type (tree *, tree, bool);
 879
 880 extern tree builtin_type_for_size (int, bool);
 881
 882 extern void warn_array_subscript_with_type_char (tree);
 883 extern void warn_about_parentheses (enum tree_code, enum tree_code,
 884                                     enum tree_code);
 885 extern void warn_for_unused_label (tree label);
 886 extern void warn_for_div_by_zero (tree divisor);
 887
 888
 889 /* In c-gimplify.c  */
 890 extern void c_genericize (tree);
 891 extern int c_gimplify_expr (tree *, tree *, tree *);
 892 extern tree c_build_bind_expr (tree, tree);
 893
 894 /* In c-pch.c  */
 895 extern void pch_init (void);
 896 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 897 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 898                                const char *orig);
 899 extern void c_common_write_pch (void);
 900 extern void c_common_no_more_pch (void);
 901 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
 902 extern void c_common_print_pch_checksum (FILE *f);
 903
 904 /* In *-checksum.c */
 905 extern const unsigned char executable_checksum[16];
 906
 907 extern void builtin_define_with_value (const char *, const char *, int);
 908 extern void c_stddef_cpp_builtins (void);
 909 extern void fe_file_change (const struct line_map *);
 910 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 911
 912 /* Objective-C / Objective-C++ entry points.  */
 913
 914 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 915    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 916 extern tree objc_is_class_name (tree);
 917 extern tree objc_is_object_ptr (tree);
 918 extern void objc_check_decl (tree);
 919 extern int objc_is_reserved_word (tree);
 920 extern bool objc_compare_types (tree, tree, int, tree);
 921 extern void objc_volatilize_decl (tree);
 922 extern bool objc_type_quals_match (tree, tree);
 923 extern tree objc_rewrite_function_call (tree, tree);
 924 extern tree objc_message_selector (void);
 925 extern tree objc_lookup_ivar (tree, tree);
 926 extern void objc_clear_super_receiver (void);
 927 extern int objc_is_public (tree, tree);
 928 extern tree objc_is_id (tree);
 929 extern void objc_declare_alias (tree, tree);
 930 extern void objc_declare_class (tree);
 931 extern void objc_declare_protocols (tree);
 932 extern tree objc_build_message_expr (tree);
 933 extern tree objc_finish_message_expr (tree, tree, tree);
 934 extern tree objc_build_selector_expr (tree);
 935 extern tree objc_build_protocol_expr (tree);
 936 extern tree objc_build_encode_expr (tree);
 937 extern tree objc_build_string_object (tree);
 938 extern tree objc_get_protocol_qualified_type (tree, tree);
 939 extern tree objc_get_class_reference (tree);
 940 extern tree objc_get_class_ivars (tree);
 941 extern void objc_start_class_interface (tree, tree, tree);
 942 extern void objc_start_category_interface (tree, tree, tree);
 943 extern void objc_start_protocol (tree, tree);
 944 extern void objc_continue_interface (void);
 945 extern void objc_finish_interface (void);
 946 extern void objc_start_class_implementation (tree, tree);
 947 extern void objc_start_category_implementation (tree, tree);
 948 extern void objc_continue_implementation (void);
 949 extern void objc_finish_implementation (void);
 950 extern void objc_set_visibility (int);
 951 extern void objc_set_method_type (enum tree_code);
 952 extern tree objc_build_method_signature (tree, tree, tree, bool);
 953 extern void objc_add_method_declaration (tree);
 954 extern void objc_start_method_definition (tree);
 955 extern void objc_finish_method_definition (tree);
 956 extern void objc_add_instance_variable (tree);
 957 extern tree objc_build_keyword_decl (tree, tree, tree);
 958 extern tree objc_build_throw_stmt (tree);
 959 extern void objc_begin_try_stmt (location_t, tree);
 960 extern tree objc_finish_try_stmt (void);
 961 extern void objc_begin_catch_clause (tree);
 962 extern void objc_finish_catch_clause (void);
 963 extern void objc_build_finally_clause (location_t, tree);
 964 extern tree objc_build_synchronized (location_t, tree, tree);
 965 extern int objc_static_init_needed_p (void);
 966 extern tree objc_generate_static_init_call (tree);
 967 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
 968
 969 /* The following are provided by the C and C++ front-ends, and called by
 970    ObjC/ObjC++.  */
 971 extern void *objc_get_current_scope (void);
 972 extern void objc_mark_locals_volatile (void *);
 973
 974 /* In c-ppoutput.c  */
 975 extern void init_pp_output (FILE *);
 976 extern void preprocess_file (cpp_reader *);
 977 extern void pp_file_change (const struct line_map *);
 978 extern void pp_dir_change (cpp_reader *, const char *);
 979 extern bool check_missing_format_attribute (tree, tree);
 980
 981 /* In c-omp.c  */
 982 extern tree c_finish_omp_master (tree);
 983 extern tree c_finish_omp_critical (tree, tree);
 984 extern tree c_finish_omp_ordered (tree);
 985 extern void c_finish_omp_barrier (void);
 986 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
 987 extern void c_finish_omp_flush (void);
 988 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
 989 extern void c_split_parallel_clauses (tree, tree *, tree *);
 990 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
 991
 992 /* Not in c-omp.c; provided by the front end.  */
 993 extern bool c_omp_sharing_predetermined (tree);
 994 extern tree c_omp_remap_decl (tree, bool);
 995
 996 /* In order for the format checking to accept the C frontend
 997    diagnostic framework extensions, you must include this file before
 998    toplev.h, not after.  The C front end formats are a subset of those
 999    for C++, so they are the appropriate set to use in common code;
1000    cp-tree.h overrides this for C++.  */
1001 #ifndef GCC_DIAG_STYLE
1002 #define GCC_DIAG_STYLE __gcc_cdiag__
1003 #endif
1004
1005 /* Functions called automatically at the beginning and end of execution.  */
1006 extern GTY (()) tree static_ctors;
1007 extern GTY (()) tree static_dtors;
1008
1009 extern void c_record_cdtor_fn (tree);
1010 extern void c_build_cdtor_fns (void);
1011
1012 #endif /* ! GCC_C_COMMON_H */