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, 2008
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  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, RID_SAT,
  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   RID_FRACT, RID_ACCUM,
  77
  78   /* This means to warn that this is a C++ keyword, and then treat it
  79      as a normal identifier.  */
  80   RID_CXX_COMPAT_WARN,
  81
  82   /* Too many ways of getting the name of a function as a string */
  83   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  84
  85   /* C++ */
  86   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  87   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  88   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  89   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  90   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  91   RID_THIS,     RID_THROW,    RID_TRUE,
  92   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  93   RID_USING,    RID_CHAR16,   RID_CHAR32,
  94
  95   /* casts */
  96   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  97
  98   /* C++ extensions */
  99   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
 100   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
 101   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
 102   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_VIRTUAL_DESTRUCTOR,
 103   RID_IS_ABSTRACT,             RID_IS_BASE_OF,
 104   RID_IS_CONVERTIBLE_TO,       RID_IS_CLASS,
 105   RID_IS_EMPTY,                RID_IS_ENUM,
 106   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 107   RID_IS_UNION,
 108
 109   /* C++0x */
 110   RID_STATIC_ASSERT, RID_DECLTYPE,
 111
 112   /* Objective-C */
 113   RID_AT_ENCODE,   RID_AT_END,
 114   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 115   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 116   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 117   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 118   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 119   RID_AT_INTERFACE,
 120   RID_AT_IMPLEMENTATION,
 121
 122   RID_MAX,
 123
 124   RID_FIRST_MODIFIER = RID_STATIC,
 125   RID_LAST_MODIFIER = RID_ONEWAY,
 126
 127   RID_FIRST_CXX0X = RID_STATIC_ASSERT,
 128   RID_LAST_CXX0X = RID_DECLTYPE,
 129   RID_FIRST_AT = RID_AT_ENCODE,
 130   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 131   RID_FIRST_PQ = RID_IN,
 132   RID_LAST_PQ = RID_ONEWAY
 133 };
 134
 135 #define OBJC_IS_AT_KEYWORD(rid) \
 136   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 137    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 138
 139 #define OBJC_IS_PQ_KEYWORD(rid) \
 140   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 141    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 142
 143 /* The elements of `ridpointers' are identifier nodes for the reserved
 144    type names and storage classes.  It is indexed by a RID_... value.  */
 145 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 146
 147 /* Standard named or nameless data types of the C compiler.  */
 148
 149 enum c_tree_index
 150 {
 151     CTI_CHAR16_TYPE,
 152     CTI_CHAR32_TYPE,
 153     CTI_WCHAR_TYPE,
 154     CTI_SIGNED_WCHAR_TYPE,
 155     CTI_UNSIGNED_WCHAR_TYPE,
 156     CTI_WINT_TYPE,
 157     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 158     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 159     CTI_INTMAX_TYPE,
 160     CTI_UINTMAX_TYPE,
 161     CTI_WIDEST_INT_LIT_TYPE,
 162     CTI_WIDEST_UINT_LIT_TYPE,
 163
 164     CTI_CHAR_ARRAY_TYPE,
 165     CTI_CHAR16_ARRAY_TYPE,
 166     CTI_CHAR32_ARRAY_TYPE,
 167     CTI_WCHAR_ARRAY_TYPE,
 168     CTI_INT_ARRAY_TYPE,
 169     CTI_STRING_TYPE,
 170     CTI_CONST_STRING_TYPE,
 171
 172     /* Type for boolean expressions (bool in C++, int in C).  */
 173     CTI_TRUTHVALUE_TYPE,
 174     CTI_TRUTHVALUE_TRUE,
 175     CTI_TRUTHVALUE_FALSE,
 176
 177     CTI_DEFAULT_FUNCTION_TYPE,
 178
 179     /* These are not types, but we have to look them up all the time.  */
 180     CTI_FUNCTION_NAME_DECL,
 181     CTI_PRETTY_FUNCTION_NAME_DECL,
 182     CTI_C99_FUNCTION_NAME_DECL,
 183     CTI_SAVED_FUNCTION_NAME_DECLS,
 184
 185     CTI_VOID_ZERO,
 186
 187     CTI_NULL,
 188
 189     CTI_MAX
 190 };
 191
 192 #define C_CPP_HASHNODE(id) \
 193   (&(((struct c_common_identifier *) (id))->node))
 194 #define C_RID_CODE(id) \
 195   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 196 #define C_SET_RID_CODE(id, code) \
 197   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 198
 199 /* Identifier part common to the C front ends.  Inherits from
 200    tree_identifier, despite appearances.  */
 201 struct c_common_identifier GTY(())
 202 {
 203   struct tree_common common;
 204   struct cpp_hashnode node;
 205 };
 206
 207 /* An entry in the reserved keyword table.  */
 208
 209 struct c_common_resword
 210 {
 211   const char *const word;
 212   ENUM_BITFIELD(rid) const rid : 16;
 213   const unsigned int disable   : 16;
 214 };
 215
 216 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 217    mask) is _true_.  Thus for keywords which are present in all
 218    languages the disable field is zero.  */
 219
 220 #define D_CONLY         0x001   /* C only (not in C++).  */
 221 #define D_CXXONLY       0x002   /* C++ only (not in C).  */
 222 #define D_C99           0x004   /* In C, C99 only.  */
 223 #define D_CXX0X         0x008   /* In C++, C++0X only.  */
 224 #define D_EXT           0x010   /* GCC extension.  */
 225 #define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
 226 #define D_ASM           0x040   /* Disabled by -fno-asm.  */
 227 #define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
 228 #define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
 229 #define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
 230
 231 /* The reserved keyword table.  */
 232 extern const struct c_common_resword c_common_reswords[];
 233
 234 /* The number of items in the reserved keyword table.  */
 235 extern const unsigned int num_c_common_reswords;
 236
 237 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 238 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 239 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 240 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 241 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 242 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 243 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 244 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 245 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 246 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 247 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 248 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 249
 250 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 251 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 252 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 253
 254 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 255 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 256 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 257 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 258 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 259 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 260 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 261
 262 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 263
 264 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 265 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 266 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 267 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 268
 269 /* A node for `((void) 0)'.  */
 270 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 271
 272 /* The node for C++ `__null'.  */
 273 #define null_node                       c_global_trees[CTI_NULL]
 274
 275 extern GTY(()) tree c_global_trees[CTI_MAX];
 276
 277 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 278    tree for size reasons.  */
 279 struct sorted_fields_type GTY(())
 280 {
 281   int len;
 282   tree GTY((length ("%h.len"))) elts[1];
 283 };
 284
 285 /* Mark which labels are explicitly declared.
 286    These may be shadowed, and may be referenced from nested functions.  */
 287 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 288
 289 typedef enum c_language_kind
 290 {
 291   clk_c         = 0,            /* C90, C94 or C99 */
 292   clk_objc      = 1,            /* clk_c with ObjC features.  */
 293   clk_cxx       = 2,            /* ANSI/ISO C++ */
 294   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 295 }
 296 c_language_kind;
 297
 298 /* To test for a specific language use c_language, defined by each
 299    front end.  For "ObjC features" or "not C++" use the macros.  */
 300 extern c_language_kind c_language;
 301
 302 #define c_dialect_cxx()         (c_language & clk_cxx)
 303 #define c_dialect_objc()        (c_language & clk_objc)
 304
 305 /* Information about a statement tree.  */
 306
 307 struct stmt_tree_s GTY(()) {
 308   /* The current statement list being collected.  */
 309   tree x_cur_stmt_list;
 310
 311   /* In C++, Nonzero if we should treat statements as full
 312      expressions.  In particular, this variable is no-zero if at the
 313      end of a statement we should destroy any temporaries created
 314      during that statement.  Similarly, if, at the end of a block, we
 315      should destroy any local variables in this block.  Normally, this
 316      variable is nonzero, since those are the normal semantics of
 317      C++.
 318
 319      However, in order to represent aggregate initialization code as
 320      tree structure, we use statement-expressions.  The statements
 321      within the statement expression should not result in cleanups
 322      being run until the entire enclosing statement is complete.
 323
 324      This flag has no effect in C.  */
 325   int stmts_are_full_exprs_p;
 326 };
 327
 328 typedef struct stmt_tree_s *stmt_tree;
 329
 330 /* Global state pertinent to the current function.  Some C dialects
 331    extend this structure with additional fields.  */
 332
 333 struct c_language_function GTY(()) {
 334   /* While we are parsing the function, this contains information
 335      about the statement-tree that we are building.  */
 336   struct stmt_tree_s x_stmt_tree;
 337 };
 338
 339 /* When building a statement-tree, this is the current statement list
 340    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 341    statement list.  */
 342
 343 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 344
 345 /* Language-specific hooks.  */
 346
 347 /* If non-NULL, this function is called after a precompile header file
 348    is loaded.  */
 349 extern void (*lang_post_pch_load) (void);
 350
 351 extern void push_file_scope (void);
 352 extern void pop_file_scope (void);
 353 extern stmt_tree current_stmt_tree (void);
 354 extern tree push_stmt_list (void);
 355 extern tree pop_stmt_list (tree);
 356 extern tree add_stmt (tree);
 357 extern void push_cleanup (tree, tree, bool);
 358 extern tree pushdecl_top_level (tree);
 359 extern tree pushdecl (tree);
 360 extern tree build_modify_expr (location_t, tree, enum tree_code, tree);
 361 extern tree build_indirect_ref (location_t, tree, const char *);
 362
 363 extern int c_expand_decl (tree);
 364
 365 extern int field_decl_cmp (const void *, const void *);
 366 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 367                                   void *);
 368 extern bool has_c_linkage (const_tree decl);
 369 \f
 370 /* Switches common to the C front ends.  */
 371
 372 /* Nonzero if prepreprocessing only.  */
 373
 374 extern int flag_preprocess_only;
 375
 376 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 377    calls will be used in ObjC; passing nil receivers to such calls
 378    will most likely result in crashes.  */
 379 extern int flag_nil_receivers;
 380
 381 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 382    @try, etc.) in source code.  */
 383 extern int flag_objc_exceptions;
 384
 385 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 386 extern int flag_objc_sjlj_exceptions;
 387
 388 /* Nonzero means that code generation will be altered to support
 389    "zero-link" execution.  This currently affects ObjC only, but may
 390    affect other languages in the future.  */
 391 extern int flag_zero_link;
 392
 393 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 394    unit.  It will inform the ObjC runtime that class definition(s) herein
 395    contained are to replace one(s) previously loaded.  */
 396 extern int flag_replace_objc_classes;
 397
 398 /* Nonzero means don't output line number information.  */
 399
 400 extern char flag_no_line_commands;
 401
 402 /* Nonzero causes -E output not to be done, but directives such as
 403    #define that have side effects are still obeyed.  */
 404
 405 extern char flag_no_output;
 406
 407 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 408    'N' or 'U' of the command line switch.  */
 409
 410 extern char flag_dump_macros;
 411
 412 /* Nonzero means pass #include lines through to the output.  */
 413
 414 extern char flag_dump_includes;
 415
 416 /* Nonzero means process PCH files while preprocessing.  */
 417
 418 extern bool flag_pch_preprocess;
 419
 420 /* The file name to which we should write a precompiled header, or
 421    NULL if no header will be written in this compile.  */
 422
 423 extern const char *pch_file;
 424
 425 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 426    user's namespace.  */
 427
 428 extern int flag_iso;
 429
 430 /* Nonzero if -undef was given.  It suppresses target built-in macros
 431    and assertions.  */
 432
 433 extern int flag_undef;
 434
 435 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 436
 437 extern int flag_no_builtin;
 438
 439 /* Nonzero means don't recognize the non-ANSI builtin functions.
 440    -ansi sets this.  */
 441
 442 extern int flag_no_nonansi_builtin;
 443
 444 /* Nonzero means give `double' the same size as `float'.  */
 445
 446 extern int flag_short_double;
 447
 448 /* Nonzero means give `wchar_t' the same size as `short'.  */
 449
 450 extern int flag_short_wchar;
 451
 452 /* Nonzero means allow implicit conversions between vectors with
 453    differing numbers of subparts and/or differing element types.  */
 454 extern int flag_lax_vector_conversions;
 455
 456 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 457 extern int flag_ms_extensions;
 458
 459 /* Nonzero means don't recognize the keyword `asm'.  */
 460
 461 extern int flag_no_asm;
 462
 463 /* Nonzero means give string constants the type `const char *', as mandated
 464    by the standard.  */
 465
 466 extern int flag_const_strings;
 467
 468 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 469
 470 extern int flag_signed_bitfields;
 471
 472 /* Warn about #pragma directives that are not recognized.  */
 473
 474 extern int warn_unknown_pragmas; /* Tri state variable.  */
 475
 476 /* Warn about format/argument anomalies in calls to formatted I/O functions
 477    (*printf, *scanf, strftime, strfmon, etc.).  */
 478
 479 extern int warn_format;
 480
 481
 482 /* C/ObjC language option variables.  */
 483
 484
 485 /* Nonzero means allow type mismatches in conditional expressions;
 486    just make their values `void'.  */
 487
 488 extern int flag_cond_mismatch;
 489
 490 /* Nonzero means enable C89 Amendment 1 features.  */
 491
 492 extern int flag_isoc94;
 493
 494 /* Nonzero means use the ISO C99 dialect of C.  */
 495
 496 extern int flag_isoc99;
 497
 498 /* Nonzero means that we have builtin functions, and main is an int.  */
 499
 500 extern int flag_hosted;
 501
 502 /* ObjC language option variables.  */
 503
 504
 505 /* Open and close the file for outputting class declarations, if
 506    requested (ObjC).  */
 507
 508 extern int flag_gen_declaration;
 509
 510 /* Tells the compiler that this is a special run.  Do not perform any
 511    compiling, instead we are to test some platform dependent features
 512    and output a C header file with appropriate definitions.  */
 513
 514 extern int print_struct_values;
 515
 516 /* ???.  Undocumented.  */
 517
 518 extern const char *constant_string_class_name;
 519
 520
 521 /* C++ language option variables.  */
 522
 523
 524 /* Nonzero means don't recognize any extension keywords.  */
 525
 526 extern int flag_no_gnu_keywords;
 527
 528 /* Nonzero means do emit exported implementations of functions even if
 529    they can be inlined.  */
 530
 531 extern int flag_implement_inlines;
 532
 533 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 534
 535 extern int flag_implicit_templates;
 536
 537 /* Nonzero means that implicit instantiations of inline templates will be
 538    emitted if needed, even if instantiations of non-inline templates
 539    aren't.  */
 540
 541 extern int flag_implicit_inline_templates;
 542
 543 /* Nonzero means generate separate instantiation control files and
 544    juggle them at link time.  */
 545
 546 extern int flag_use_repository;
 547
 548 /* Nonzero if we want to issue diagnostics that the standard says are not
 549    required.  */
 550
 551 extern int flag_optional_diags;
 552
 553 /* Nonzero means we should attempt to elide constructors when possible.  */
 554
 555 extern int flag_elide_constructors;
 556
 557 /* Nonzero means that member functions defined in class scope are
 558    inline by default.  */
 559
 560 extern int flag_default_inline;
 561
 562 /* Controls whether compiler generates 'type descriptor' that give
 563    run-time type information.  */
 564
 565 extern int flag_rtti;
 566
 567 /* Nonzero if we want to conserve space in the .o files.  We do this
 568    by putting uninitialized data and runtime initialized data into
 569    .common instead of .data at the expense of not flagging multiple
 570    definitions.  */
 571
 572 extern int flag_conserve_space;
 573
 574 /* Nonzero if we want to obey access control semantics.  */
 575
 576 extern int flag_access_control;
 577
 578 /* Nonzero if we want to check the return value of new and avoid calling
 579    constructors if it is a null pointer.  */
 580
 581 extern int flag_check_new;
 582
 583 /* The supported C++ dialects.  */
 584
 585 enum cxx_dialect {
 586   /* C++98  */
 587   cxx98,
 588   /* Experimental features that are likely to become part of
 589      C++0x.  */
 590   cxx0x
 591 };
 592
 593 /* The C++ dialect being used. C++98 is the default.  */
 594 extern enum cxx_dialect cxx_dialect;
 595
 596 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 597    initialization variables.
 598    0: Old rules, set by -fno-for-scope.
 599    2: New ISO rules, set by -ffor-scope.
 600    1: Try to implement new ISO rules, but with backup compatibility
 601    (and warnings).  This is the default, for now.  */
 602
 603 extern int flag_new_for_scope;
 604
 605 /* Nonzero if we want to emit defined symbols with common-like linkage as
 606    weak symbols where possible, in order to conform to C++ semantics.
 607    Otherwise, emit them as local symbols.  */
 608
 609 extern int flag_weak;
 610
 611 /* 0 means we want the preprocessor to not emit line directives for
 612    the current working directory.  1 means we want it to do it.  -1
 613    means we should decide depending on whether debugging information
 614    is being emitted or not.  */
 615
 616 extern int flag_working_directory;
 617
 618 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 619    destructors for local statics and global objects.  */
 620
 621 extern int flag_use_cxa_atexit;
 622
 623 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
 624    logic.  */
 625
 626 extern int flag_use_cxa_get_exception_ptr;
 627
 628 /* Nonzero means to implement standard semantics for exception
 629    specifications, calling unexpected if an exception is thrown that
 630    doesn't match the specification.  Zero means to treat them as
 631    assertions and optimize accordingly, but not check them.  */
 632
 633 extern int flag_enforce_eh_specs;
 634
 635 /* Nonzero (the default) means to generate thread-safe code for
 636    initializing local statics.  */
 637
 638 extern int flag_threadsafe_statics;
 639
 640 /* Nonzero means warn about implicit declarations.  */
 641
 642 extern int warn_implicit;
 643
 644 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 645    with GCC this doesn't matter as __null is guaranteed to have the right
 646    size.  */
 647
 648 extern int warn_strict_null_sentinel;
 649
 650 /* Maximum template instantiation depth.  This limit is rather
 651    arbitrary, but it exists to limit the time it takes to notice
 652    infinite template instantiations.  */
 653
 654 extern int max_tinst_depth;
 655
 656 /* Nonzero means the expression being parsed will never be evaluated.
 657    This is a count, since unevaluated expressions can nest.  */
 658
 659 extern int skip_evaluation;
 660
 661 /* C types are partitioned into three subsets: object, function, and
 662    incomplete types.  */
 663 #define C_TYPE_OBJECT_P(type) \
 664   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 665
 666 #define C_TYPE_INCOMPLETE_P(type) \
 667   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 668
 669 #define C_TYPE_FUNCTION_P(type) \
 670   (TREE_CODE (type) == FUNCTION_TYPE)
 671
 672 /* For convenience we define a single macro to identify the class of
 673    object or incomplete types.  */
 674 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 675   (!C_TYPE_FUNCTION_P (type))
 676
 677 /* Attribute table common to the C front ends.  */
 678 extern const struct attribute_spec c_common_attribute_table[];
 679 extern const struct attribute_spec c_common_format_attribute_table[];
 680
 681 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 682    ID is the identifier to use, NAME is the string.
 683    TYPE_DEP indicates whether it depends on type of the function or not
 684    (i.e. __PRETTY_FUNCTION__).  */
 685
 686 extern tree (*make_fname_decl) (tree, int);
 687
 688 extern tree identifier_global_value (tree);
 689 extern void record_builtin_type (enum rid, const char *, tree);
 690 extern tree build_void_list_node (void);
 691 extern void start_fname_decls (void);
 692 extern void finish_fname_decls (void);
 693 extern const char *fname_as_string (int);
 694 extern tree fname_decl (location_t, unsigned, tree);
 695
 696 extern void check_function_arguments (tree, int, tree *, tree);
 697 extern void check_function_arguments_recurse (void (*)
 698                                               (void *, tree,
 699                                                unsigned HOST_WIDE_INT),
 700                                               void *, tree,
 701                                               unsigned HOST_WIDE_INT);
 702 extern bool check_builtin_function_arguments (tree, int, tree *);
 703 extern void check_function_format (tree, int, tree *);
 704 extern void set_Wformat (int);
 705 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 706 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 707 extern int c_common_handle_option (size_t code, const char *arg, int value);
 708 extern bool c_common_missing_argument (const char *opt, size_t code);
 709 extern tree c_common_type_for_mode (enum machine_mode, int);
 710 extern tree c_common_type_for_size (unsigned int, int);
 711 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 712                                                 int, int);
 713 extern tree c_common_unsigned_type (tree);
 714 extern tree c_common_signed_type (tree);
 715 extern tree c_common_signed_or_unsigned_type (int, tree);
 716 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 717 extern bool decl_with_nonnull_addr_p (const_tree);
 718 extern tree c_common_truthvalue_conversion (location_t, tree);
 719 extern void c_apply_type_quals_to_decl (int, tree);
 720 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 721 extern tree c_alignof_expr (tree);
 722 /* Print an error message for invalid operands to arith operation CODE.
 723    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 724 extern void binary_op_error (location_t, enum tree_code, tree, tree);
 725 extern tree fix_string_type (tree);
 726 struct varray_head_tag;
 727 extern void constant_expression_warning (tree);
 728 extern void constant_expression_error (tree);
 729 extern bool strict_aliasing_warning (tree, tree, tree);
 730 extern void warnings_for_convert_and_check (tree, tree, tree);
 731 extern tree convert_and_check (tree, tree);
 732 extern void overflow_warning (tree);
 733 extern void warn_logical_operator (enum tree_code, tree, tree);
 734 extern void check_main_parameter_types (tree decl);
 735 extern bool c_determine_visibility (tree);
 736 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 737
 738 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 739 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 740
 741 /* Subroutine of build_binary_op, used for certain operations.  */
 742 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 743
 744 /* Subroutine of build_binary_op, used for comparison operations.
 745    See if the operands have both been converted from subword integer types
 746    and, if so, perhaps change them both back to their original type.  */
 747 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 748
 749 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree);
 750
 751 /* Add qualifiers to a type, in the fashion for C.  */
 752 extern tree c_build_qualified_type (tree, int);
 753
 754 /* Build tree nodes and builtin functions common to both C and C++ language
 755    frontends.  */
 756 extern void c_common_nodes_and_builtins (void);
 757
 758 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 759
 760 extern void disable_builtin_function (const char *);
 761
 762 extern void set_compound_literal_name (tree decl);
 763
 764 extern tree build_va_arg (tree, tree);
 765
 766 extern unsigned int c_common_init_options (unsigned int, const char **);
 767 extern bool c_common_post_options (const char **);
 768 extern bool c_common_init (void);
 769 extern void c_common_finish (void);
 770 extern void c_common_parse_file (int);
 771 extern alias_set_type c_common_get_alias_set (tree);
 772 extern void c_register_builtin_type (tree, const char*);
 773 extern bool c_promoting_integer_type_p (const_tree);
 774 extern int self_promoting_args_p (const_tree);
 775 extern tree strip_pointer_operator (tree);
 776 extern tree strip_pointer_or_array_types (tree);
 777 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 778
 779 /* This is the basic parsing function.  */
 780 extern void c_parse_file (void);
 781 /* This is misnamed, it actually performs end-of-compilation processing.  */
 782 extern void finish_file (void);
 783
 784
 785 /* These macros provide convenient access to the various _STMT nodes.  */
 786
 787 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 788    if a statement expression.  */
 789 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 790   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 791
 792 /* Nonzero if a label has been added to the statement list.  */
 793 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 794   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 795
 796 /* COMPOUND_LITERAL_EXPR accessors.  */
 797 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 798   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 799 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 800   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 801
 802 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 803 #define DECL_C_BIT_FIELD(NODE) \
 804   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 805 #define SET_DECL_C_BIT_FIELD(NODE) \
 806   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 807 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 808   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 809
 810 extern void emit_local_var (tree);
 811 extern tree do_case (tree, tree);
 812 extern tree build_stmt (enum tree_code, ...);
 813 extern tree build_case_label (tree, tree, tree);
 814
 815 /* These functions must be defined by each front-end which implements
 816    a variant of the C language.  They are used in c-common.c.  */
 817
 818 extern tree build_unary_op (location_t, enum tree_code, tree, int);
 819 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
 820 extern tree perform_integral_promotions (tree);
 821
 822 /* These functions must be defined by each front-end which implements
 823    a variant of the C language.  They are used by port files.  */
 824
 825 extern tree default_conversion (tree);
 826
 827 /* Given two integer or real types, return the type for their sum.
 828    Given two compatible ANSI C types, returns the merged type.  */
 829
 830 extern tree common_type (tree, tree);
 831
 832 extern tree decl_constant_value (tree);
 833
 834 /* Handle increment and decrement of boolean types.  */
 835 extern tree boolean_increment (enum tree_code, tree);
 836
 837 extern int case_compare (splay_tree_key, splay_tree_key);
 838
 839 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 840
 841 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 842
 843 extern tree build_function_call (tree, tree);
 844
 845 extern tree resolve_overloaded_builtin (tree, tree);
 846
 847 extern tree finish_label_address_expr (tree, location_t);
 848
 849 /* Same function prototype, but the C and C++ front ends have
 850    different implementations.  Used in c-common.c.  */
 851 extern tree lookup_label (tree);
 852 extern tree lookup_name (tree);
 853
 854 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
 855 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 856
 857 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 858
 859 extern tree c_staticp (tree);
 860
 861 extern void init_c_lex (void);
 862
 863 extern void c_cpp_builtins (cpp_reader *);
 864 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
 865
 866 /* Positive if an implicit `extern "C"' scope has just been entered;
 867    negative if such a scope has just been exited.  */
 868 extern GTY(()) int pending_lang_change;
 869
 870 /* Information recorded about each file examined during compilation.  */
 871
 872 struct c_fileinfo
 873 {
 874   int time;     /* Time spent in the file.  */
 875
 876   /* Flags used only by C++.
 877      INTERFACE_ONLY nonzero means that we are in an "interface" section
 878      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 879      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 880      INTERFACE_ONLY is zero, it means that we are responsible for
 881      exporting definitions that others might need.  */
 882   short interface_only;
 883   short interface_unknown;
 884 };
 885
 886 struct c_fileinfo *get_fileinfo (const char *);
 887 extern void dump_time_statistics (void);
 888
 889 extern bool c_dump_tree (void *, tree);
 890
 891 extern void c_warn_unused_result (gimple_seq);
 892
 893 extern void verify_sequence_points (tree);
 894
 895 extern tree fold_offsetof (tree, tree);
 896
 897 /* Places where an lvalue, or modifiable lvalue, may be required.
 898    Used to select diagnostic messages in lvalue_error and
 899    readonly_error.  */
 900 enum lvalue_use {
 901   lv_assign,
 902   lv_increment,
 903   lv_decrement,
 904   lv_addressof,
 905   lv_asm
 906 };
 907
 908 extern void lvalue_error (enum lvalue_use);
 909
 910 extern int complete_array_type (tree *, tree, bool);
 911
 912 extern tree builtin_type_for_size (int, bool);
 913
 914 extern void warn_array_subscript_with_type_char (tree);
 915 extern void warn_about_parentheses (enum tree_code,
 916                                     enum tree_code, tree,
 917                                     enum tree_code, tree);
 918 extern void warn_for_unused_label (tree label);
 919 extern void warn_for_div_by_zero (location_t, tree divisor);
 920 extern void warn_for_sign_compare (location_t,
 921                                    tree orig_op0, tree orig_op1,
 922                                    tree op0, tree op1,
 923                                    tree result_type,
 924                                    enum tree_code resultcode);
 925
 926 /* In c-gimplify.c  */
 927 extern void c_genericize (tree);
 928 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
 929 extern tree c_build_bind_expr (tree, tree);
 930
 931 /* In c-pch.c  */
 932 extern void pch_init (void);
 933 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 934 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 935                                const char *orig);
 936 extern void c_common_write_pch (void);
 937 extern void c_common_no_more_pch (void);
 938 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
 939 extern void c_common_print_pch_checksum (FILE *f);
 940
 941 /* In *-checksum.c */
 942 extern const unsigned char executable_checksum[16];
 943
 944 /* In c-cppbuiltin.c  */
 945 extern void builtin_define_std (const char *macro);
 946 extern void builtin_define_with_value (const char *, const char *, int);
 947 extern void c_stddef_cpp_builtins (void);
 948 extern void fe_file_change (const struct line_map *);
 949 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 950
 951 /* Objective-C / Objective-C++ entry points.  */
 952
 953 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 954    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 955 extern tree objc_is_class_name (tree);
 956 extern tree objc_is_object_ptr (tree);
 957 extern void objc_check_decl (tree);
 958 extern int objc_is_reserved_word (tree);
 959 extern bool objc_compare_types (tree, tree, int, tree);
 960 extern void objc_volatilize_decl (tree);
 961 extern bool objc_type_quals_match (tree, tree);
 962 extern tree objc_rewrite_function_call (tree, tree);
 963 extern tree objc_message_selector (void);
 964 extern tree objc_lookup_ivar (tree, tree);
 965 extern void objc_clear_super_receiver (void);
 966 extern int objc_is_public (tree, tree);
 967 extern tree objc_is_id (tree);
 968 extern void objc_declare_alias (tree, tree);
 969 extern void objc_declare_class (tree);
 970 extern void objc_declare_protocols (tree);
 971 extern tree objc_build_message_expr (tree);
 972 extern tree objc_finish_message_expr (tree, tree, tree);
 973 extern tree objc_build_selector_expr (tree);
 974 extern tree objc_build_protocol_expr (tree);
 975 extern tree objc_build_encode_expr (tree);
 976 extern tree objc_build_string_object (tree);
 977 extern tree objc_get_protocol_qualified_type (tree, tree);
 978 extern tree objc_get_class_reference (tree);
 979 extern tree objc_get_class_ivars (tree);
 980 extern void objc_start_class_interface (tree, tree, tree);
 981 extern void objc_start_category_interface (tree, tree, tree);
 982 extern void objc_start_protocol (tree, tree);
 983 extern void objc_continue_interface (void);
 984 extern void objc_finish_interface (void);
 985 extern void objc_start_class_implementation (tree, tree);
 986 extern void objc_start_category_implementation (tree, tree);
 987 extern void objc_continue_implementation (void);
 988 extern void objc_finish_implementation (void);
 989 extern void objc_set_visibility (int);
 990 extern void objc_set_method_type (enum tree_code);
 991 extern tree objc_build_method_signature (tree, tree, tree, bool);
 992 extern void objc_add_method_declaration (tree);
 993 extern void objc_start_method_definition (tree);
 994 extern void objc_finish_method_definition (tree);
 995 extern void objc_add_instance_variable (tree);
 996 extern tree objc_build_keyword_decl (tree, tree, tree);
 997 extern tree objc_build_throw_stmt (tree);
 998 extern void objc_begin_try_stmt (location_t, tree);
 999 extern tree objc_finish_try_stmt (void);
1000 extern void objc_begin_catch_clause (tree);
1001 extern void objc_finish_catch_clause (void);
1002 extern void objc_build_finally_clause (location_t, tree);
1003 extern tree objc_build_synchronized (location_t, tree, tree);
1004 extern int objc_static_init_needed_p (void);
1005 extern tree objc_generate_static_init_call (tree);
1006 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
1007
1008 /* The following are provided by the C and C++ front-ends, and called by
1009    ObjC/ObjC++.  */
1010 extern void *objc_get_current_scope (void);
1011 extern void objc_mark_locals_volatile (void *);
1012
1013 /* In c-ppoutput.c  */
1014 extern void init_pp_output (FILE *);
1015 extern void preprocess_file (cpp_reader *);
1016 extern void pp_file_change (const struct line_map *);
1017 extern void pp_dir_change (cpp_reader *, const char *);
1018 extern bool check_missing_format_attribute (tree, tree);
1019
1020 /* In c-omp.c  */
1021 extern tree c_finish_omp_master (tree);
1022 extern tree c_finish_omp_critical (tree, tree);
1023 extern tree c_finish_omp_ordered (tree);
1024 extern void c_finish_omp_barrier (void);
1025 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
1026 extern void c_finish_omp_flush (void);
1027 extern void c_finish_omp_taskwait (void);
1028 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1029 extern void c_split_parallel_clauses (tree, tree *, tree *);
1030 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1031
1032 /* Not in c-omp.c; provided by the front end.  */
1033 extern bool c_omp_sharing_predetermined (tree);
1034 extern tree c_omp_remap_decl (tree, bool);
1035
1036 /* In order for the format checking to accept the C frontend
1037    diagnostic framework extensions, you must include this file before
1038    toplev.h, not after.  The C front end formats are a subset of those
1039    for C++, so they are the appropriate set to use in common code;
1040    cp-tree.h overrides this for C++.  */
1041 #ifndef GCC_DIAG_STYLE
1042 #define GCC_DIAG_STYLE __gcc_cdiag__
1043 #endif
1044
1045 #endif /* ! GCC_C_COMMON_H */