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, 2009
   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       C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)
  34    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  35       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  36       C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)
  37    2: unused
  38    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  39    4: unused
  40 */
  41
  42 /* Reserved identifiers.  This is the union of all the keywords for C,
  43    C++, and Objective-C.  All the type modifiers have to be in one
  44    block at the beginning, because they are used as mask bits.  There
  45    are 27 type modifiers; if we add many more we will have to redesign
  46    the mask mechanism.  */
  47
  48 enum rid
  49 {
  50   /* Modifiers: */
  51   /* C, in empirical order of frequency.  */
  52   RID_STATIC = 0,
  53   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  54   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  55   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  56
  57   /* C extensions */
  58   RID_COMPLEX, RID_THREAD, RID_SAT,
  59
  60   /* C++ */
  61   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  62
  63   /* ObjC */
  64   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  65
  66   /* C (reserved and imaginary types not implemented, so any use is a
  67      syntax error) */
  68   RID_IMAGINARY,
  69
  70   /* C */
  71   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  72   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  73   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  74   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  75   RID_SIZEOF,
  76
  77   /* C extensions */
  78   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  79   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
  80   RID_TYPES_COMPATIBLE_P,
  81   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
  82   RID_FRACT, RID_ACCUM,
  83
  84   /* This means to warn that this is a C++ keyword, and then treat it
  85      as a normal identifier.  */
  86   RID_CXX_COMPAT_WARN,
  87
  88   /* Too many ways of getting the name of a function as a string */
  89   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  90
  91   /* C++ */
  92   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  93   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  94   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  95   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  96   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  97   RID_THIS,     RID_THROW,    RID_TRUE,
  98   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  99   RID_USING,    RID_CHAR16,   RID_CHAR32,
 100
 101   /* casts */
 102   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
 103
 104   /* C++ extensions */
 105   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
 106   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
 107   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
 108   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_VIRTUAL_DESTRUCTOR,
 109   RID_IS_ABSTRACT,             RID_IS_BASE_OF,
 110   RID_IS_CONVERTIBLE_TO,       RID_IS_CLASS,
 111   RID_IS_EMPTY,                RID_IS_ENUM,
 112   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 113   RID_IS_UNION,
 114
 115   /* C++0x */
 116   RID_STATIC_ASSERT, RID_DECLTYPE,
 117
 118   /* Objective-C */
 119   RID_AT_ENCODE,   RID_AT_END,
 120   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 121   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 122   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 123   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 124   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 125   RID_AT_INTERFACE,
 126   RID_AT_IMPLEMENTATION,
 127
 128   RID_MAX,
 129
 130   RID_FIRST_MODIFIER = RID_STATIC,
 131   RID_LAST_MODIFIER = RID_ONEWAY,
 132
 133   RID_FIRST_CXX0X = RID_STATIC_ASSERT,
 134   RID_LAST_CXX0X = RID_DECLTYPE,
 135   RID_FIRST_AT = RID_AT_ENCODE,
 136   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 137   RID_FIRST_PQ = RID_IN,
 138   RID_LAST_PQ = RID_ONEWAY
 139 };
 140
 141 #define OBJC_IS_AT_KEYWORD(rid) \
 142   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 143    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 144
 145 #define OBJC_IS_PQ_KEYWORD(rid) \
 146   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 147    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 148
 149 /* The elements of `ridpointers' are identifier nodes for the reserved
 150    type names and storage classes.  It is indexed by a RID_... value.  */
 151 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 152
 153 /* Standard named or nameless data types of the C compiler.  */
 154
 155 enum c_tree_index
 156 {
 157     CTI_CHAR16_TYPE,
 158     CTI_CHAR32_TYPE,
 159     CTI_WCHAR_TYPE,
 160     CTI_UNDERLYING_WCHAR_TYPE,
 161     CTI_WINT_TYPE,
 162     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 163     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 164     CTI_INTMAX_TYPE,
 165     CTI_UINTMAX_TYPE,
 166     CTI_WIDEST_INT_LIT_TYPE,
 167     CTI_WIDEST_UINT_LIT_TYPE,
 168
 169     /* Types for <stdint.h>, that may not be defined on all
 170        targets.  */
 171     CTI_SIG_ATOMIC_TYPE,
 172     CTI_INT8_TYPE,
 173     CTI_INT16_TYPE,
 174     CTI_INT32_TYPE,
 175     CTI_INT64_TYPE,
 176     CTI_UINT8_TYPE,
 177     CTI_UINT16_TYPE,
 178     CTI_UINT32_TYPE,
 179     CTI_UINT64_TYPE,
 180     CTI_INT_LEAST8_TYPE,
 181     CTI_INT_LEAST16_TYPE,
 182     CTI_INT_LEAST32_TYPE,
 183     CTI_INT_LEAST64_TYPE,
 184     CTI_UINT_LEAST8_TYPE,
 185     CTI_UINT_LEAST16_TYPE,
 186     CTI_UINT_LEAST32_TYPE,
 187     CTI_UINT_LEAST64_TYPE,
 188     CTI_INT_FAST8_TYPE,
 189     CTI_INT_FAST16_TYPE,
 190     CTI_INT_FAST32_TYPE,
 191     CTI_INT_FAST64_TYPE,
 192     CTI_UINT_FAST8_TYPE,
 193     CTI_UINT_FAST16_TYPE,
 194     CTI_UINT_FAST32_TYPE,
 195     CTI_UINT_FAST64_TYPE,
 196     CTI_INTPTR_TYPE,
 197     CTI_UINTPTR_TYPE,
 198
 199     CTI_CHAR_ARRAY_TYPE,
 200     CTI_CHAR16_ARRAY_TYPE,
 201     CTI_CHAR32_ARRAY_TYPE,
 202     CTI_WCHAR_ARRAY_TYPE,
 203     CTI_INT_ARRAY_TYPE,
 204     CTI_STRING_TYPE,
 205     CTI_CONST_STRING_TYPE,
 206
 207     /* Type for boolean expressions (bool in C++, int in C).  */
 208     CTI_TRUTHVALUE_TYPE,
 209     CTI_TRUTHVALUE_TRUE,
 210     CTI_TRUTHVALUE_FALSE,
 211
 212     CTI_DEFAULT_FUNCTION_TYPE,
 213
 214     /* These are not types, but we have to look them up all the time.  */
 215     CTI_FUNCTION_NAME_DECL,
 216     CTI_PRETTY_FUNCTION_NAME_DECL,
 217     CTI_C99_FUNCTION_NAME_DECL,
 218     CTI_SAVED_FUNCTION_NAME_DECLS,
 219
 220     CTI_VOID_ZERO,
 221
 222     CTI_NULL,
 223
 224     CTI_MAX
 225 };
 226
 227 #define C_CPP_HASHNODE(id) \
 228   (&(((struct c_common_identifier *) (id))->node))
 229 #define C_RID_CODE(id) \
 230   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 231 #define C_SET_RID_CODE(id, code) \
 232   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 233
 234 /* Identifier part common to the C front ends.  Inherits from
 235    tree_identifier, despite appearances.  */
 236 struct GTY(()) c_common_identifier {
 237   struct tree_common common;
 238   struct cpp_hashnode node;
 239 };
 240
 241 /* An entry in the reserved keyword table.  */
 242
 243 struct c_common_resword
 244 {
 245   const char *const word;
 246   ENUM_BITFIELD(rid) const rid : 16;
 247   const unsigned int disable   : 16;
 248 };
 249
 250 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 251    mask) is _true_.  Thus for keywords which are present in all
 252    languages the disable field is zero.  */
 253
 254 #define D_CONLY         0x001   /* C only (not in C++).  */
 255 #define D_CXXONLY       0x002   /* C++ only (not in C).  */
 256 #define D_C99           0x004   /* In C, C99 only.  */
 257 #define D_CXX0X         0x008   /* In C++, C++0X only.  */
 258 #define D_EXT           0x010   /* GCC extension.  */
 259 #define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
 260 #define D_ASM           0x040   /* Disabled by -fno-asm.  */
 261 #define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
 262 #define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
 263 #define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
 264
 265 /* The reserved keyword table.  */
 266 extern const struct c_common_resword c_common_reswords[];
 267
 268 /* The number of items in the reserved keyword table.  */
 269 extern const unsigned int num_c_common_reswords;
 270
 271 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 272 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 273 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 274 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 275 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 276 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 277 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 278 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 279 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 280 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 281 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 282
 283 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 284 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 285 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 286 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 287 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 288 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 289 #define uint16_type_node                c_global_trees[CTI_UINT16_TYPE]
 290 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 291 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 292 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 293 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 294 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 295 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 296 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 297 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 298 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 299 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 300 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 301 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 302 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 303 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 304 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 305 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 306 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 307 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 308 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 309 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 310
 311 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 312 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 313 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 314
 315 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 316 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 317 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 318 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 319 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 320 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 321 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 322
 323 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 324
 325 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 326 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 327 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 328 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 329
 330 /* A node for `((void) 0)'.  */
 331 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 332
 333 /* The node for C++ `__null'.  */
 334 #define null_node                       c_global_trees[CTI_NULL]
 335
 336 extern GTY(()) tree c_global_trees[CTI_MAX];
 337
 338 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 339    tree for size reasons.  */
 340 struct GTY(()) sorted_fields_type {
 341   int len;
 342   tree GTY((length ("%h.len"))) elts[1];
 343 };
 344
 345 /* Mark which labels are explicitly declared.
 346    These may be shadowed, and may be referenced from nested functions.  */
 347 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 348
 349 typedef enum c_language_kind
 350 {
 351   clk_c         = 0,            /* C90, C94 or C99 */
 352   clk_objc      = 1,            /* clk_c with ObjC features.  */
 353   clk_cxx       = 2,            /* ANSI/ISO C++ */
 354   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 355 }
 356 c_language_kind;
 357
 358 /* To test for a specific language use c_language, defined by each
 359    front end.  For "ObjC features" or "not C++" use the macros.  */
 360 extern c_language_kind c_language;
 361
 362 #define c_dialect_cxx()         (c_language & clk_cxx)
 363 #define c_dialect_objc()        (c_language & clk_objc)
 364
 365 /* Information about a statement tree.  */
 366
 367 struct GTY(()) stmt_tree_s {
 368   /* The current statement list being collected.  */
 369   tree x_cur_stmt_list;
 370
 371   /* In C++, Nonzero if we should treat statements as full
 372      expressions.  In particular, this variable is no-zero if at the
 373      end of a statement we should destroy any temporaries created
 374      during that statement.  Similarly, if, at the end of a block, we
 375      should destroy any local variables in this block.  Normally, this
 376      variable is nonzero, since those are the normal semantics of
 377      C++.
 378
 379      However, in order to represent aggregate initialization code as
 380      tree structure, we use statement-expressions.  The statements
 381      within the statement expression should not result in cleanups
 382      being run until the entire enclosing statement is complete.
 383
 384      This flag has no effect in C.  */
 385   int stmts_are_full_exprs_p;
 386 };
 387
 388 typedef struct stmt_tree_s *stmt_tree;
 389
 390 /* Global state pertinent to the current function.  Some C dialects
 391    extend this structure with additional fields.  */
 392
 393 struct GTY(()) c_language_function {
 394   /* While we are parsing the function, this contains information
 395      about the statement-tree that we are building.  */
 396   struct stmt_tree_s x_stmt_tree;
 397 };
 398
 399 /* When building a statement-tree, this is the current statement list
 400    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 401    statement list.  */
 402
 403 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 404
 405 /* Language-specific hooks.  */
 406
 407 /* If non-NULL, this function is called after a precompile header file
 408    is loaded.  */
 409 extern void (*lang_post_pch_load) (void);
 410
 411 extern void push_file_scope (void);
 412 extern void pop_file_scope (void);
 413 extern stmt_tree current_stmt_tree (void);
 414 extern tree push_stmt_list (void);
 415 extern tree pop_stmt_list (tree);
 416 extern tree add_stmt (tree);
 417 extern void push_cleanup (tree, tree, bool);
 418 extern tree pushdecl_top_level (tree);
 419 extern tree pushdecl (tree);
 420 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 421                                tree, tree);
 422 extern tree build_indirect_ref (location_t, tree, const char *);
 423
 424 extern int c_expand_decl (tree);
 425
 426 extern int field_decl_cmp (const void *, const void *);
 427 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 428                                   void *);
 429 extern bool has_c_linkage (const_tree decl);
 430 \f
 431 /* Switches common to the C front ends.  */
 432
 433 /* Nonzero if prepreprocessing only.  */
 434
 435 extern int flag_preprocess_only;
 436
 437 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 438    calls will be used in ObjC; passing nil receivers to such calls
 439    will most likely result in crashes.  */
 440 extern int flag_nil_receivers;
 441
 442 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 443    @try, etc.) in source code.  */
 444 extern int flag_objc_exceptions;
 445
 446 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 447 extern int flag_objc_sjlj_exceptions;
 448
 449 /* Nonzero means that code generation will be altered to support
 450    "zero-link" execution.  This currently affects ObjC only, but may
 451    affect other languages in the future.  */
 452 extern int flag_zero_link;
 453
 454 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 455    unit.  It will inform the ObjC runtime that class definition(s) herein
 456    contained are to replace one(s) previously loaded.  */
 457 extern int flag_replace_objc_classes;
 458
 459 /* Nonzero means don't output line number information.  */
 460
 461 extern char flag_no_line_commands;
 462
 463 /* Nonzero causes -E output not to be done, but directives such as
 464    #define that have side effects are still obeyed.  */
 465
 466 extern char flag_no_output;
 467
 468 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 469    'N' or 'U' of the command line switch.  */
 470
 471 extern char flag_dump_macros;
 472
 473 /* Nonzero means pass #include lines through to the output.  */
 474
 475 extern char flag_dump_includes;
 476
 477 /* Nonzero means process PCH files while preprocessing.  */
 478
 479 extern bool flag_pch_preprocess;
 480
 481 /* The file name to which we should write a precompiled header, or
 482    NULL if no header will be written in this compile.  */
 483
 484 extern const char *pch_file;
 485
 486 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 487    user's namespace.  */
 488
 489 extern int flag_iso;
 490
 491 /* Nonzero if -undef was given.  It suppresses target built-in macros
 492    and assertions.  */
 493
 494 extern int flag_undef;
 495
 496 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 497
 498 extern int flag_no_builtin;
 499
 500 /* Nonzero means don't recognize the non-ANSI builtin functions.
 501    -ansi sets this.  */
 502
 503 extern int flag_no_nonansi_builtin;
 504
 505 /* Nonzero means give `double' the same size as `float'.  */
 506
 507 extern int flag_short_double;
 508
 509 /* Nonzero means give `wchar_t' the same size as `short'.  */
 510
 511 extern int flag_short_wchar;
 512
 513 /* Nonzero means allow implicit conversions between vectors with
 514    differing numbers of subparts and/or differing element types.  */
 515 extern int flag_lax_vector_conversions;
 516
 517 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 518 extern int flag_ms_extensions;
 519
 520 /* Nonzero means don't recognize the keyword `asm'.  */
 521
 522 extern int flag_no_asm;
 523
 524 /* Nonzero means give string constants the type `const char *', as mandated
 525    by the standard.  */
 526
 527 extern int flag_const_strings;
 528
 529 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 530
 531 extern int flag_signed_bitfields;
 532
 533 /* Warn about #pragma directives that are not recognized.  */
 534
 535 extern int warn_unknown_pragmas; /* Tri state variable.  */
 536
 537 /* Warn about format/argument anomalies in calls to formatted I/O functions
 538    (*printf, *scanf, strftime, strfmon, etc.).  */
 539
 540 extern int warn_format;
 541
 542
 543 /* C/ObjC language option variables.  */
 544
 545
 546 /* Nonzero means allow type mismatches in conditional expressions;
 547    just make their values `void'.  */
 548
 549 extern int flag_cond_mismatch;
 550
 551 /* Nonzero means enable C89 Amendment 1 features.  */
 552
 553 extern int flag_isoc94;
 554
 555 /* Nonzero means use the ISO C99 dialect of C.  */
 556
 557 extern int flag_isoc99;
 558
 559 /* Nonzero means that we have builtin functions, and main is an int.  */
 560
 561 extern int flag_hosted;
 562
 563 /* ObjC language option variables.  */
 564
 565
 566 /* Open and close the file for outputting class declarations, if
 567    requested (ObjC).  */
 568
 569 extern int flag_gen_declaration;
 570
 571 /* Tells the compiler that this is a special run.  Do not perform any
 572    compiling, instead we are to test some platform dependent features
 573    and output a C header file with appropriate definitions.  */
 574
 575 extern int print_struct_values;
 576
 577 /* ???.  Undocumented.  */
 578
 579 extern const char *constant_string_class_name;
 580
 581
 582 /* C++ language option variables.  */
 583
 584
 585 /* Nonzero means don't recognize any extension keywords.  */
 586
 587 extern int flag_no_gnu_keywords;
 588
 589 /* Nonzero means do emit exported implementations of functions even if
 590    they can be inlined.  */
 591
 592 extern int flag_implement_inlines;
 593
 594 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 595
 596 extern int flag_implicit_templates;
 597
 598 /* Nonzero means that implicit instantiations of inline templates will be
 599    emitted if needed, even if instantiations of non-inline templates
 600    aren't.  */
 601
 602 extern int flag_implicit_inline_templates;
 603
 604 /* Nonzero means generate separate instantiation control files and
 605    juggle them at link time.  */
 606
 607 extern int flag_use_repository;
 608
 609 /* Nonzero if we want to issue diagnostics that the standard says are not
 610    required.  */
 611
 612 extern int flag_optional_diags;
 613
 614 /* Nonzero means we should attempt to elide constructors when possible.  */
 615
 616 extern int flag_elide_constructors;
 617
 618 /* Nonzero means that member functions defined in class scope are
 619    inline by default.  */
 620
 621 extern int flag_default_inline;
 622
 623 /* Controls whether compiler generates 'type descriptor' that give
 624    run-time type information.  */
 625
 626 extern int flag_rtti;
 627
 628 /* Nonzero if we want to conserve space in the .o files.  We do this
 629    by putting uninitialized data and runtime initialized data into
 630    .common instead of .data at the expense of not flagging multiple
 631    definitions.  */
 632
 633 extern int flag_conserve_space;
 634
 635 /* Nonzero if we want to obey access control semantics.  */
 636
 637 extern int flag_access_control;
 638
 639 /* Nonzero if we want to check the return value of new and avoid calling
 640    constructors if it is a null pointer.  */
 641
 642 extern int flag_check_new;
 643
 644 /* The supported C++ dialects.  */
 645
 646 enum cxx_dialect {
 647   /* C++98  */
 648   cxx98,
 649   /* Experimental features that are likely to become part of
 650      C++0x.  */
 651   cxx0x
 652 };
 653
 654 /* The C++ dialect being used. C++98 is the default.  */
 655 extern enum cxx_dialect cxx_dialect;
 656
 657 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 658    initialization variables.
 659    0: Old rules, set by -fno-for-scope.
 660    2: New ISO rules, set by -ffor-scope.
 661    1: Try to implement new ISO rules, but with backup compatibility
 662    (and warnings).  This is the default, for now.  */
 663
 664 extern int flag_new_for_scope;
 665
 666 /* Nonzero if we want to emit defined symbols with common-like linkage as
 667    weak symbols where possible, in order to conform to C++ semantics.
 668    Otherwise, emit them as local symbols.  */
 669
 670 extern int flag_weak;
 671
 672 /* 0 means we want the preprocessor to not emit line directives for
 673    the current working directory.  1 means we want it to do it.  -1
 674    means we should decide depending on whether debugging information
 675    is being emitted or not.  */
 676
 677 extern int flag_working_directory;
 678
 679 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 680    destructors for local statics and global objects.  */
 681
 682 extern int flag_use_cxa_atexit;
 683
 684 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
 685    logic.  */
 686
 687 extern int flag_use_cxa_get_exception_ptr;
 688
 689 /* Nonzero means to implement standard semantics for exception
 690    specifications, calling unexpected if an exception is thrown that
 691    doesn't match the specification.  Zero means to treat them as
 692    assertions and optimize accordingly, but not check them.  */
 693
 694 extern int flag_enforce_eh_specs;
 695
 696 /* Nonzero (the default) means to generate thread-safe code for
 697    initializing local statics.  */
 698
 699 extern int flag_threadsafe_statics;
 700
 701 /* Nonzero if we want to pretty-print template specializations as the
 702    template signature followed by the arguments.  */
 703
 704 extern int flag_pretty_templates;
 705
 706 /* Nonzero means warn about implicit declarations.  */
 707
 708 extern int warn_implicit;
 709
 710 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 711    with GCC this doesn't matter as __null is guaranteed to have the right
 712    size.  */
 713
 714 extern int warn_strict_null_sentinel;
 715
 716 /* Maximum template instantiation depth.  This limit is rather
 717    arbitrary, but it exists to limit the time it takes to notice
 718    infinite template instantiations.  */
 719
 720 extern int max_tinst_depth;
 721
 722 /* Nonzero means the expression being parsed will never be evaluated.
 723    This is a count, since unevaluated expressions can nest.  */
 724
 725 extern int skip_evaluation;
 726
 727 /* Whether lexing has been completed, so subsequent preprocessor
 728    errors should use the compiler's input_location.  */
 729
 730 extern bool done_lexing;
 731
 732 /* C types are partitioned into three subsets: object, function, and
 733    incomplete types.  */
 734 #define C_TYPE_OBJECT_P(type) \
 735   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 736
 737 #define C_TYPE_INCOMPLETE_P(type) \
 738   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 739
 740 #define C_TYPE_FUNCTION_P(type) \
 741   (TREE_CODE (type) == FUNCTION_TYPE)
 742
 743 /* For convenience we define a single macro to identify the class of
 744    object or incomplete types.  */
 745 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 746   (!C_TYPE_FUNCTION_P (type))
 747
 748 /* Attribute table common to the C front ends.  */
 749 extern const struct attribute_spec c_common_attribute_table[];
 750 extern const struct attribute_spec c_common_format_attribute_table[];
 751
 752 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 753    ID is the identifier to use, NAME is the string.
 754    TYPE_DEP indicates whether it depends on type of the function or not
 755    (i.e. __PRETTY_FUNCTION__).  */
 756
 757 extern tree (*make_fname_decl) (tree, int);
 758
 759 extern tree identifier_global_value (tree);
 760 extern void record_builtin_type (enum rid, const char *, tree);
 761 extern tree build_void_list_node (void);
 762 extern void start_fname_decls (void);
 763 extern void finish_fname_decls (void);
 764 extern const char *fname_as_string (int);
 765 extern tree fname_decl (location_t, unsigned, tree);
 766
 767 extern void check_function_arguments (tree, int, tree *, tree);
 768 extern void check_function_arguments_recurse (void (*)
 769                                               (void *, tree,
 770                                                unsigned HOST_WIDE_INT),
 771                                               void *, tree,
 772                                               unsigned HOST_WIDE_INT);
 773 extern bool check_builtin_function_arguments (tree, int, tree *);
 774 extern void check_function_format (tree, int, tree *);
 775 extern void set_Wformat (int);
 776 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 777 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 778 extern int c_common_handle_option (size_t code, const char *arg, int value);
 779 extern bool c_common_missing_argument (const char *opt, size_t code);
 780 extern tree c_common_type_for_mode (enum machine_mode, int);
 781 extern tree c_common_type_for_size (unsigned int, int);
 782 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 783                                                 int, int);
 784 extern tree c_common_unsigned_type (tree);
 785 extern tree c_common_signed_type (tree);
 786 extern tree c_common_signed_or_unsigned_type (int, tree);
 787 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 788 extern bool decl_with_nonnull_addr_p (const_tree);
 789 extern tree c_fully_fold (tree, bool, bool *);
 790 extern tree decl_constant_value_for_optimization (tree);
 791 extern tree c_save_expr (tree);
 792 extern tree c_common_truthvalue_conversion (location_t, tree);
 793 extern void c_apply_type_quals_to_decl (int, tree);
 794 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 795 extern tree c_alignof_expr (tree);
 796 /* Print an error message for invalid operands to arith operation CODE.
 797    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 798 extern void binary_op_error (location_t, enum tree_code, tree, tree);
 799 extern tree fix_string_type (tree);
 800 struct varray_head_tag;
 801 extern void constant_expression_warning (tree);
 802 extern void constant_expression_error (tree);
 803 extern bool strict_aliasing_warning (tree, tree, tree);
 804 extern void warnings_for_convert_and_check (tree, tree, tree);
 805 extern tree convert_and_check (tree, tree);
 806 extern void overflow_warning (tree);
 807 extern void warn_logical_operator (location_t, enum tree_code,
 808                                    enum tree_code, tree, enum tree_code, tree);
 809 extern void check_main_parameter_types (tree decl);
 810 extern bool c_determine_visibility (tree);
 811 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 812 extern void mark_valid_location_for_stdc_pragma (bool);
 813 extern bool valid_location_for_stdc_pragma_p (void);
 814 extern void set_float_const_decimal64 (void);
 815 extern void clear_float_const_decimal64 (void);
 816 extern bool float_const_decimal64_p (void);
 817
 818 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 819 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 820
 821 /* Subroutine of build_binary_op, used for certain operations.  */
 822 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 823
 824 /* Subroutine of build_binary_op, used for comparison operations.
 825    See if the operands have both been converted from subword integer types
 826    and, if so, perhaps change them both back to their original type.  */
 827 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 828
 829 extern tree pointer_int_sum (enum tree_code, tree, tree);
 830
 831 /* Add qualifiers to a type, in the fashion for C.  */
 832 extern tree c_build_qualified_type (tree, int);
 833
 834 /* Build tree nodes and builtin functions common to both C and C++ language
 835    frontends.  */
 836 extern void c_common_nodes_and_builtins (void);
 837
 838 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 839
 840 extern void disable_builtin_function (const char *);
 841
 842 extern void set_compound_literal_name (tree decl);
 843
 844 extern tree build_va_arg (tree, tree);
 845
 846 extern unsigned int c_common_init_options (unsigned int, const char **);
 847 extern bool c_common_post_options (const char **);
 848 extern bool c_common_init (void);
 849 extern void c_common_finish (void);
 850 extern void c_common_parse_file (int);
 851 extern alias_set_type c_common_get_alias_set (tree);
 852 extern void c_register_builtin_type (tree, const char*);
 853 extern bool c_promoting_integer_type_p (const_tree);
 854 extern int self_promoting_args_p (const_tree);
 855 extern tree strip_pointer_operator (tree);
 856 extern tree strip_pointer_or_array_types (tree);
 857 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 858
 859 /* This is the basic parsing function.  */
 860 extern void c_parse_file (void);
 861 /* This is misnamed, it actually performs end-of-compilation processing.  */
 862 extern void finish_file (void);
 863
 864
 865 /* These macros provide convenient access to the various _STMT nodes.  */
 866
 867 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 868    if a statement expression.  */
 869 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 870   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 871
 872 /* Nonzero if a label has been added to the statement list.  */
 873 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 874   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 875
 876 /* C_MAYBE_CONST_EXPR accessors.  */
 877 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
 878   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
 879 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
 880   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
 881 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
 882   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 883 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
 884   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 885 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
 886   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
 887    && (TREE_CODE (EXPR) == INTEGER_CST                  \
 888        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
 889            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
 890
 891 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 892 #define DECL_C_BIT_FIELD(NODE) \
 893   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 894 #define SET_DECL_C_BIT_FIELD(NODE) \
 895   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 896 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 897   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 898
 899 extern tree do_case (tree, tree);
 900 extern tree build_stmt (enum tree_code, ...);
 901 extern tree build_case_label (tree, tree, tree);
 902
 903 /* These functions must be defined by each front-end which implements
 904    a variant of the C language.  They are used in c-common.c.  */
 905
 906 extern tree build_unary_op (location_t, enum tree_code, tree, int);
 907 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
 908 extern tree perform_integral_promotions (tree);
 909
 910 /* These functions must be defined by each front-end which implements
 911    a variant of the C language.  They are used by port files.  */
 912
 913 extern tree default_conversion (tree);
 914
 915 /* Given two integer or real types, return the type for their sum.
 916    Given two compatible ANSI C types, returns the merged type.  */
 917
 918 extern tree common_type (tree, tree);
 919
 920 extern tree decl_constant_value (tree);
 921
 922 /* Handle increment and decrement of boolean types.  */
 923 extern tree boolean_increment (enum tree_code, tree);
 924
 925 extern int case_compare (splay_tree_key, splay_tree_key);
 926
 927 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 928
 929 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 930
 931 extern tree build_function_call (tree, tree);
 932
 933 extern tree build_function_call_vec (tree, VEC(tree,gc) *, VEC(tree,gc) *);
 934
 935 extern tree resolve_overloaded_builtin (tree, VEC(tree,gc) *);
 936
 937 extern tree finish_label_address_expr (tree, location_t);
 938
 939 /* Same function prototype, but the C and C++ front ends have
 940    different implementations.  Used in c-common.c.  */
 941 extern tree lookup_label (tree);
 942 extern tree lookup_name (tree);
 943 extern bool lvalue_p (const_tree);
 944
 945 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
 946 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 947
 948 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 949
 950 extern void init_c_lex (void);
 951
 952 extern void c_cpp_builtins (cpp_reader *);
 953 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
 954
 955 /* Positive if an implicit `extern "C"' scope has just been entered;
 956    negative if such a scope has just been exited.  */
 957 extern GTY(()) int pending_lang_change;
 958
 959 /* Information recorded about each file examined during compilation.  */
 960
 961 struct c_fileinfo
 962 {
 963   int time;     /* Time spent in the file.  */
 964
 965   /* Flags used only by C++.
 966      INTERFACE_ONLY nonzero means that we are in an "interface" section
 967      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 968      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 969      INTERFACE_ONLY is zero, it means that we are responsible for
 970      exporting definitions that others might need.  */
 971   short interface_only;
 972   short interface_unknown;
 973 };
 974
 975 struct c_fileinfo *get_fileinfo (const char *);
 976 extern void dump_time_statistics (void);
 977
 978 extern bool c_dump_tree (void *, tree);
 979
 980 extern void c_warn_unused_result (gimple_seq);
 981
 982 extern void verify_sequence_points (tree);
 983
 984 extern tree fold_offsetof (tree, tree);
 985
 986 /* Places where an lvalue, or modifiable lvalue, may be required.
 987    Used to select diagnostic messages in lvalue_error and
 988    readonly_error.  */
 989 enum lvalue_use {
 990   lv_assign,
 991   lv_increment,
 992   lv_decrement,
 993   lv_addressof,
 994   lv_asm
 995 };
 996
 997 extern void lvalue_error (enum lvalue_use);
 998
 999 extern int complete_array_type (tree *, tree, bool);
1000
1001 extern tree builtin_type_for_size (int, bool);
1002
1003 extern void warn_array_subscript_with_type_char (tree);
1004 extern void warn_about_parentheses (enum tree_code,
1005                                     enum tree_code, tree,
1006                                     enum tree_code, tree);
1007 extern void warn_for_unused_label (tree label);
1008 extern void warn_for_div_by_zero (location_t, tree divisor);
1009 extern void warn_for_sign_compare (location_t,
1010                                    tree orig_op0, tree orig_op1,
1011                                    tree op0, tree op1,
1012                                    tree result_type,
1013                                    enum tree_code resultcode);
1014 extern void set_underlying_type (tree x);
1015 extern bool is_typedef_decl (tree x);
1016
1017 /* In c-gimplify.c  */
1018 extern void c_genericize (tree);
1019 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1020 extern tree c_build_bind_expr (tree, tree);
1021
1022 /* In c-pch.c  */
1023 extern void pch_init (void);
1024 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1025 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1026                                const char *orig);
1027 extern void c_common_write_pch (void);
1028 extern void c_common_no_more_pch (void);
1029 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1030 extern void c_common_print_pch_checksum (FILE *f);
1031
1032 /* In *-checksum.c */
1033 extern const unsigned char executable_checksum[16];
1034
1035 /* In c-cppbuiltin.c  */
1036 extern void builtin_define_std (const char *macro);
1037 extern void builtin_define_with_value (const char *, const char *, int);
1038 extern void c_stddef_cpp_builtins (void);
1039 extern void fe_file_change (const struct line_map *);
1040 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char);
1041
1042 /* Objective-C / Objective-C++ entry points.  */
1043
1044 /* The following ObjC/ObjC++ functions are called by the C and/or C++
1045    front-ends; they all must have corresponding stubs in stub-objc.c.  */
1046 extern tree objc_is_class_name (tree);
1047 extern tree objc_is_object_ptr (tree);
1048 extern void objc_check_decl (tree);
1049 extern int objc_is_reserved_word (tree);
1050 extern bool objc_compare_types (tree, tree, int, tree);
1051 extern void objc_volatilize_decl (tree);
1052 extern bool objc_type_quals_match (tree, tree);
1053 extern tree objc_rewrite_function_call (tree, tree);
1054 extern tree objc_message_selector (void);
1055 extern tree objc_lookup_ivar (tree, tree);
1056 extern void objc_clear_super_receiver (void);
1057 extern int objc_is_public (tree, tree);
1058 extern tree objc_is_id (tree);
1059 extern void objc_declare_alias (tree, tree);
1060 extern void objc_declare_class (tree);
1061 extern void objc_declare_protocols (tree);
1062 extern tree objc_build_message_expr (tree);
1063 extern tree objc_finish_message_expr (tree, tree, tree);
1064 extern tree objc_build_selector_expr (tree);
1065 extern tree objc_build_protocol_expr (tree);
1066 extern tree objc_build_encode_expr (tree);
1067 extern tree objc_build_string_object (tree);
1068 extern tree objc_get_protocol_qualified_type (tree, tree);
1069 extern tree objc_get_class_reference (tree);
1070 extern tree objc_get_class_ivars (tree);
1071 extern void objc_start_class_interface (tree, tree, tree);
1072 extern void objc_start_category_interface (tree, tree, tree);
1073 extern void objc_start_protocol (tree, tree);
1074 extern void objc_continue_interface (void);
1075 extern void objc_finish_interface (void);
1076 extern void objc_start_class_implementation (tree, tree);
1077 extern void objc_start_category_implementation (tree, tree);
1078 extern void objc_continue_implementation (void);
1079 extern void objc_finish_implementation (void);
1080 extern void objc_set_visibility (int);
1081 extern void objc_set_method_type (enum tree_code);
1082 extern tree objc_build_method_signature (tree, tree, tree, bool);
1083 extern void objc_add_method_declaration (tree);
1084 extern void objc_start_method_definition (tree);
1085 extern void objc_finish_method_definition (tree);
1086 extern void objc_add_instance_variable (tree);
1087 extern tree objc_build_keyword_decl (tree, tree, tree);
1088 extern tree objc_build_throw_stmt (tree);
1089 extern void objc_begin_try_stmt (location_t, tree);
1090 extern tree objc_finish_try_stmt (void);
1091 extern void objc_begin_catch_clause (tree);
1092 extern void objc_finish_catch_clause (void);
1093 extern void objc_build_finally_clause (location_t, tree);
1094 extern tree objc_build_synchronized (location_t, tree, tree);
1095 extern int objc_static_init_needed_p (void);
1096 extern tree objc_generate_static_init_call (tree);
1097 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
1098
1099 /* The following are provided by the C and C++ front-ends, and called by
1100    ObjC/ObjC++.  */
1101 extern void *objc_get_current_scope (void);
1102 extern void objc_mark_locals_volatile (void *);
1103
1104 /* In c-ppoutput.c  */
1105 extern void init_pp_output (FILE *);
1106 extern void preprocess_file (cpp_reader *);
1107 extern void pp_file_change (const struct line_map *);
1108 extern void pp_dir_change (cpp_reader *, const char *);
1109 extern bool check_missing_format_attribute (tree, tree);
1110
1111 /* In c-omp.c  */
1112 extern tree c_finish_omp_master (tree);
1113 extern tree c_finish_omp_critical (tree, tree);
1114 extern tree c_finish_omp_ordered (tree);
1115 extern void c_finish_omp_barrier (void);
1116 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
1117 extern void c_finish_omp_flush (void);
1118 extern void c_finish_omp_taskwait (void);
1119 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1120 extern void c_split_parallel_clauses (tree, tree *, tree *);
1121 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1122
1123 /* Not in c-omp.c; provided by the front end.  */
1124 extern bool c_omp_sharing_predetermined (tree);
1125 extern tree c_omp_remap_decl (tree, bool);
1126
1127 /* In order for the format checking to accept the C frontend
1128    diagnostic framework extensions, you must include this file before
1129    toplev.h, not after.  The C front end formats are a subset of those
1130    for C++, so they are the appropriate set to use in common code;
1131    cp-tree.h overrides this for C++.  */
1132 #ifndef GCC_DIAG_STYLE
1133 #define GCC_DIAG_STYLE __gcc_cdiag__
1134 #endif
1135
1136 #endif /* ! GCC_C_COMMON_H */