gcc/c-family/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, 2010
   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 /* In order for the format checking to accept the C frontend
  30    diagnostic framework extensions, you must include this file before
  31    diagnostic-core.h, not after.  The C front end formats are a subset of those
  32    for C++, so they are the appropriate set to use in common code;
  33    cp-tree.h overrides this for C++.  */
  34 #if defined(GCC_DIAGNOSTIC_CORE_H)
  35 #error \
  36 In order for the format checking to accept the C front end diagnostic \
  37 framework extensions, you must include this file before diagnostic-core.h \
  38 never after.
  39 #endif
  40 #ifndef GCC_DIAG_STYLE
  41 #define GCC_DIAG_STYLE __gcc_cdiag__
  42 #endif
  43 #include "diagnostic-core.h"
  44
  45 /* Usage of TREE_LANG_FLAG_?:
  46    0: TREE_NEGATED_INT (in INTEGER_CST).
  47       IDENTIFIER_MARKED (used by search routines).
  48       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  49       C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)
  50    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  51       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  52       C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)
  53    2: unused
  54    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  55    4: unused
  56 */
  57
  58 /* Reserved identifiers.  This is the union of all the keywords for C,
  59    C++, and Objective-C.  All the type modifiers have to be in one
  60    block at the beginning, because they are used as mask bits.  There
  61    are 27 type modifiers; if we add many more we will have to redesign
  62    the mask mechanism.  */
  63
  64 enum rid
  65 {
  66   /* Modifiers: */
  67   /* C, in empirical order of frequency.  */
  68   RID_STATIC = 0,
  69   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  70   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  71   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  72
  73   /* C extensions */
  74   RID_COMPLEX, RID_THREAD, RID_SAT,
  75
  76   /* C++ */
  77   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  78
  79   /* ObjC ("PQ" reserved words - they do not appear after a '@' and
  80      are keywords only in specific contexts)  */
  81   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  82
  83   /* ObjC ("PATTR" reserved words - they do not appear after a '@'
  84      and are keywords only as property attributes)  */
  85   RID_GETTER, RID_SETTER,
  86   RID_READONLY, RID_READWRITE,
  87   RID_ASSIGN, RID_RETAIN, RID_COPY,
  88   RID_NONATOMIC,
  89
  90   /* C (reserved and imaginary types not implemented, so any use is a
  91      syntax error) */
  92   RID_IMAGINARY,
  93
  94   /* C */
  95   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  96   RID_INT128,
  97   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  98   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  99   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
 100   RID_SIZEOF,
 101
 102   /* C extensions */
 103   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
 104   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
 105   RID_TYPES_COMPATIBLE_P,
 106   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
 107   RID_FRACT, RID_ACCUM,
 108
 109   /* This means to warn that this is a C++ keyword, and then treat it
 110      as a normal identifier.  */
 111   RID_CXX_COMPAT_WARN,
 112
 113   /* Too many ways of getting the name of a function as a string */
 114   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
 115
 116   /* C++ (some of these are keywords in Objective-C as well, but only
 117      if they appear after a '@') */
 118   RID_BOOL,     RID_WCHAR,    RID_CLASS,
 119   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
 120   RID_TEMPLATE, RID_NULL,     RID_CATCH,
 121   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
 122   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
 123   RID_THIS,     RID_THROW,    RID_TRUE,
 124   RID_TRY,      RID_TYPENAME, RID_TYPEID,
 125   RID_USING,    RID_CHAR16,   RID_CHAR32,
 126
 127   /* casts */
 128   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
 129
 130   /* C++ extensions */
 131   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
 132   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
 133   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
 134   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_VIRTUAL_DESTRUCTOR,
 135   RID_IS_ABSTRACT,             RID_IS_BASE_OF,
 136   RID_IS_CONVERTIBLE_TO,       RID_IS_CLASS,
 137   RID_IS_EMPTY,                RID_IS_ENUM,
 138   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 139   RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,
 140   RID_IS_UNION,                RID_IS_LITERAL_TYPE,
 141
 142   /* C++0x */
 143   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 144
 145   /* Objective-C ("AT" reserved words - they are only keywords when
 146      they follow '@')  */
 147   RID_AT_ENCODE,   RID_AT_END,
 148   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 149   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 150   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 151   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 152   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 153   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 154   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 155   RID_AT_INTERFACE,
 156   RID_AT_IMPLEMENTATION,
 157
 158   /* Named address support, mapping the keyword to a particular named address
 159      number.  Named address space 0 is reserved for the generic address.  If
 160      there are more than 254 named addresses, the addr_space_t type will need
 161      to be grown from an unsigned char to unsigned short.  */
 162   RID_ADDR_SPACE_0,             /* generic address */
 163   RID_ADDR_SPACE_1,
 164   RID_ADDR_SPACE_2,
 165   RID_ADDR_SPACE_3,
 166   RID_ADDR_SPACE_4,
 167   RID_ADDR_SPACE_5,
 168   RID_ADDR_SPACE_6,
 169   RID_ADDR_SPACE_7,
 170   RID_ADDR_SPACE_8,
 171   RID_ADDR_SPACE_9,
 172   RID_ADDR_SPACE_10,
 173   RID_ADDR_SPACE_11,
 174   RID_ADDR_SPACE_12,
 175   RID_ADDR_SPACE_13,
 176   RID_ADDR_SPACE_14,
 177   RID_ADDR_SPACE_15,
 178
 179   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 180   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 181
 182   RID_MAX,
 183
 184   RID_FIRST_MODIFIER = RID_STATIC,
 185   RID_LAST_MODIFIER = RID_ONEWAY,
 186
 187   RID_FIRST_CXX0X = RID_CONSTEXPR,
 188   RID_LAST_CXX0X = RID_STATIC_ASSERT,
 189   RID_FIRST_AT = RID_AT_ENCODE,
 190   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 191   RID_FIRST_PQ = RID_IN,
 192   RID_LAST_PQ = RID_ONEWAY,
 193   RID_FIRST_PATTR = RID_GETTER,
 194   RID_LAST_PATTR = RID_NONATOMIC
 195 };
 196
 197 #define OBJC_IS_AT_KEYWORD(rid) \
 198   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 199    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 200
 201 #define OBJC_IS_PQ_KEYWORD(rid) \
 202   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 203    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 204
 205 #define OBJC_IS_PATTR_KEYWORD(rid) \
 206   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 207    (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)
 208
 209 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 210    'class') which are shared in a subtle way between Objective-C and
 211    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 212    finds '@' followed by one of these identifiers (eg, '@class'), it
 213    recognizes the whole as an Objective-C keyword.  If the identifier
 214    is found elsewhere, it follows the rules of the C/C++ language.
 215  */
 216 #define OBJC_IS_CXX_KEYWORD(rid) \
 217   (rid == RID_CLASS                                                     \
 218    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 219    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 220
 221 /* The elements of `ridpointers' are identifier nodes for the reserved
 222    type names and storage classes.  It is indexed by a RID_... value.  */
 223 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 224
 225 /* Standard named or nameless data types of the C compiler.  */
 226
 227 enum c_tree_index
 228 {
 229     CTI_CHAR16_TYPE,
 230     CTI_CHAR32_TYPE,
 231     CTI_WCHAR_TYPE,
 232     CTI_UNDERLYING_WCHAR_TYPE,
 233     CTI_WINT_TYPE,
 234     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 235     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 236     CTI_INTMAX_TYPE,
 237     CTI_UINTMAX_TYPE,
 238     CTI_WIDEST_INT_LIT_TYPE,
 239     CTI_WIDEST_UINT_LIT_TYPE,
 240
 241     /* Types for <stdint.h>, that may not be defined on all
 242        targets.  */
 243     CTI_SIG_ATOMIC_TYPE,
 244     CTI_INT8_TYPE,
 245     CTI_INT16_TYPE,
 246     CTI_INT32_TYPE,
 247     CTI_INT64_TYPE,
 248     CTI_UINT8_TYPE,
 249     CTI_UINT16_TYPE,
 250     CTI_UINT32_TYPE,
 251     CTI_UINT64_TYPE,
 252     CTI_INT_LEAST8_TYPE,
 253     CTI_INT_LEAST16_TYPE,
 254     CTI_INT_LEAST32_TYPE,
 255     CTI_INT_LEAST64_TYPE,
 256     CTI_UINT_LEAST8_TYPE,
 257     CTI_UINT_LEAST16_TYPE,
 258     CTI_UINT_LEAST32_TYPE,
 259     CTI_UINT_LEAST64_TYPE,
 260     CTI_INT_FAST8_TYPE,
 261     CTI_INT_FAST16_TYPE,
 262     CTI_INT_FAST32_TYPE,
 263     CTI_INT_FAST64_TYPE,
 264     CTI_UINT_FAST8_TYPE,
 265     CTI_UINT_FAST16_TYPE,
 266     CTI_UINT_FAST32_TYPE,
 267     CTI_UINT_FAST64_TYPE,
 268     CTI_INTPTR_TYPE,
 269     CTI_UINTPTR_TYPE,
 270
 271     CTI_CHAR_ARRAY_TYPE,
 272     CTI_CHAR16_ARRAY_TYPE,
 273     CTI_CHAR32_ARRAY_TYPE,
 274     CTI_WCHAR_ARRAY_TYPE,
 275     CTI_INT_ARRAY_TYPE,
 276     CTI_STRING_TYPE,
 277     CTI_CONST_STRING_TYPE,
 278
 279     /* Type for boolean expressions (bool in C++, int in C).  */
 280     CTI_TRUTHVALUE_TYPE,
 281     CTI_TRUTHVALUE_TRUE,
 282     CTI_TRUTHVALUE_FALSE,
 283
 284     CTI_DEFAULT_FUNCTION_TYPE,
 285
 286     /* These are not types, but we have to look them up all the time.  */
 287     CTI_FUNCTION_NAME_DECL,
 288     CTI_PRETTY_FUNCTION_NAME_DECL,
 289     CTI_C99_FUNCTION_NAME_DECL,
 290     CTI_SAVED_FUNCTION_NAME_DECLS,
 291
 292     CTI_VOID_ZERO,
 293
 294     CTI_NULL,
 295
 296     CTI_MAX
 297 };
 298
 299 #define C_CPP_HASHNODE(id) \
 300   (&(((struct c_common_identifier *) (id))->node))
 301 #define C_RID_CODE(id) \
 302   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 303 #define C_SET_RID_CODE(id, code) \
 304   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 305
 306 /* Identifier part common to the C front ends.  Inherits from
 307    tree_identifier, despite appearances.  */
 308 struct GTY(()) c_common_identifier {
 309   struct tree_common common;
 310   struct cpp_hashnode node;
 311 };
 312
 313 /* An entry in the reserved keyword table.  */
 314
 315 struct c_common_resword
 316 {
 317   const char *const word;
 318   ENUM_BITFIELD(rid) const rid : 16;
 319   const unsigned int disable   : 16;
 320 };
 321
 322 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 323    mask) is _true_.  Thus for keywords which are present in all
 324    languages the disable field is zero.  */
 325
 326 #define D_CONLY         0x001   /* C only (not in C++).  */
 327 #define D_CXXONLY       0x002   /* C++ only (not in C).  */
 328 #define D_C99           0x004   /* In C, C99 only.  */
 329 #define D_CXX0X         0x008   /* In C++, C++0X only.  */
 330 #define D_EXT           0x010   /* GCC extension.  */
 331 #define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
 332 #define D_ASM           0x040   /* Disabled by -fno-asm.  */
 333 #define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
 334 #define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
 335 #define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
 336
 337 /* The reserved keyword table.  */
 338 extern const struct c_common_resword c_common_reswords[];
 339
 340 /* The number of items in the reserved keyword table.  */
 341 extern const unsigned int num_c_common_reswords;
 342
 343 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 344 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 345 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 346 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 347 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 348 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 349 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 350 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 351 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 352 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 353 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 354
 355 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 356 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 357 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 358 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 359 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 360 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 361 #define uint16_type_node                c_global_trees[CTI_UINT16_TYPE]
 362 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 363 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 364 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 365 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 366 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 367 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 368 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 369 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 370 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 371 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 372 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 373 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 374 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 375 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 376 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 377 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 378 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 379 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 380 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 381 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 382
 383 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 384 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 385 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 386
 387 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 388 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 389 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 390 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 391 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 392 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 393 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 394
 395 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 396
 397 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 398 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 399 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 400 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 401
 402 /* A node for `((void) 0)'.  */
 403 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 404
 405 /* The node for C++ `__null'.  */
 406 #define null_node                       c_global_trees[CTI_NULL]
 407
 408 extern GTY(()) tree c_global_trees[CTI_MAX];
 409
 410 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 411    tree for size reasons.  */
 412 struct GTY((variable_size)) sorted_fields_type {
 413   int len;
 414   tree GTY((length ("%h.len"))) elts[1];
 415 };
 416
 417 /* Mark which labels are explicitly declared.
 418    These may be shadowed, and may be referenced from nested functions.  */
 419 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 420
 421 typedef enum c_language_kind
 422 {
 423   clk_c         = 0,            /* C90, C94 or C99 */
 424   clk_objc      = 1,            /* clk_c with ObjC features.  */
 425   clk_cxx       = 2,            /* ANSI/ISO C++ */
 426   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 427 }
 428 c_language_kind;
 429
 430 /* To test for a specific language use c_language, defined by each
 431    front end.  For "ObjC features" or "not C++" use the macros.  */
 432 extern c_language_kind c_language;
 433
 434 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 435 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 436
 437 /* ObjC ivar visibility types.  */
 438 typedef enum objc_ivar_visibility_kind {
 439   OBJC_IVAR_VIS_PROTECTED = 0,
 440   OBJC_IVAR_VIS_PUBLIC    = 1,
 441   OBJC_IVAR_VIS_PRIVATE   = 2,
 442   OBJC_IVAR_VIS_PACKAGE   = 3
 443 } objc_ivar_visibility_kind;
 444
 445 /* The various name of operator that appears in error messages. */
 446 typedef enum ref_operator {
 447   /* NULL */
 448   RO_NULL,
 449   /* array indexing */
 450   RO_ARRAY_INDEXING,
 451   /* unary * */
 452   RO_UNARY_STAR,
 453   /* -> */
 454   RO_ARROW,
 455   /* implicit conversion */
 456   RO_IMPLICIT_CONVERSION
 457 } ref_operator;
 458
 459 /* Information about a statement tree.  */
 460
 461 struct GTY(()) stmt_tree_s {
 462   /* The current statement list being collected.  */
 463   tree x_cur_stmt_list;
 464
 465   /* In C++, Nonzero if we should treat statements as full
 466      expressions.  In particular, this variable is no-zero if at the
 467      end of a statement we should destroy any temporaries created
 468      during that statement.  Similarly, if, at the end of a block, we
 469      should destroy any local variables in this block.  Normally, this
 470      variable is nonzero, since those are the normal semantics of
 471      C++.
 472
 473      However, in order to represent aggregate initialization code as
 474      tree structure, we use statement-expressions.  The statements
 475      within the statement expression should not result in cleanups
 476      being run until the entire enclosing statement is complete.
 477
 478      This flag has no effect in C.  */
 479   int stmts_are_full_exprs_p;
 480 };
 481
 482 typedef struct stmt_tree_s *stmt_tree;
 483
 484 /* Global state pertinent to the current function.  Some C dialects
 485    extend this structure with additional fields.  */
 486
 487 struct GTY(()) c_language_function {
 488   /* While we are parsing the function, this contains information
 489      about the statement-tree that we are building.  */
 490   struct stmt_tree_s x_stmt_tree;
 491 };
 492
 493 /* When building a statement-tree, this is the current statement list
 494    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 495    statement list.  */
 496
 497 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 498
 499 /* Language-specific hooks.  */
 500
 501 /* If non-NULL, this function is called after a precompile header file
 502    is loaded.  */
 503 extern void (*lang_post_pch_load) (void);
 504
 505 extern void push_file_scope (void);
 506 extern void pop_file_scope (void);
 507 extern stmt_tree current_stmt_tree (void);
 508 extern tree push_stmt_list (void);
 509 extern tree pop_stmt_list (tree);
 510 extern tree add_stmt (tree);
 511 extern void push_cleanup (tree, tree, bool);
 512 extern tree pushdecl_top_level (tree);
 513 extern tree pushdecl (tree);
 514 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 515                                location_t, tree, tree);
 516 extern tree build_indirect_ref (location_t, tree, ref_operator);
 517
 518 extern int c_expand_decl (tree);
 519
 520 extern int field_decl_cmp (const void *, const void *);
 521 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 522                                   void *);
 523 extern bool has_c_linkage (const_tree decl);
 524 \f
 525 /* Switches common to the C front ends.  */
 526
 527 /* Nonzero means don't output line number information.  */
 528
 529 extern char flag_no_line_commands;
 530
 531 /* Nonzero causes -E output not to be done, but directives such as
 532    #define that have side effects are still obeyed.  */
 533
 534 extern char flag_no_output;
 535
 536 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 537    'N' or 'U' of the command line switch.  */
 538
 539 extern char flag_dump_macros;
 540
 541 /* Nonzero means pass #include lines through to the output.  */
 542
 543 extern char flag_dump_includes;
 544
 545 /* Nonzero means process PCH files while preprocessing.  */
 546
 547 extern bool flag_pch_preprocess;
 548
 549 /* The file name to which we should write a precompiled header, or
 550    NULL if no header will be written in this compile.  */
 551
 552 extern const char *pch_file;
 553
 554 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 555    user's namespace.  */
 556
 557 extern int flag_iso;
 558
 559 /* Warn about #pragma directives that are not recognized.  */
 560
 561 extern int warn_unknown_pragmas; /* Tri state variable.  */
 562
 563 /* Warn about format/argument anomalies in calls to formatted I/O functions
 564    (*printf, *scanf, strftime, strfmon, etc.).  */
 565
 566 extern int warn_format;
 567
 568
 569 /* C/ObjC language option variables.  */
 570
 571
 572 /* Nonzero means allow type mismatches in conditional expressions;
 573    just make their values `void'.  */
 574
 575 extern int flag_cond_mismatch;
 576
 577 /* Nonzero means enable C89 Amendment 1 features.  */
 578
 579 extern int flag_isoc94;
 580
 581 /* Nonzero means use the ISO C99 (or C1X) dialect of C.  */
 582
 583 extern int flag_isoc99;
 584
 585 /* Nonzero means use the ISO C1X dialect of C.  */
 586
 587 extern int flag_isoc1x;
 588
 589 /* Nonzero means that we have builtin functions, and main is an int.  */
 590
 591 extern int flag_hosted;
 592
 593 /* ObjC language option variables.  */
 594
 595
 596 /* Tells the compiler that this is a special run.  Do not perform any
 597    compiling, instead we are to test some platform dependent features
 598    and output a C header file with appropriate definitions.  */
 599
 600 extern int print_struct_values;
 601
 602 /* Tells the compiler what is the constant string class for ObjC.  */
 603
 604 extern const char *constant_string_class_name;
 605
 606
 607 /* C++ language option variables.  */
 608
 609
 610 /* Nonzero means generate separate instantiation control files and
 611    juggle them at link time.  */
 612
 613 extern int flag_use_repository;
 614
 615 /* The supported C++ dialects.  */
 616
 617 enum cxx_dialect {
 618   /* C++98  */
 619   cxx98,
 620   /* Experimental features that are likely to become part of
 621      C++0x.  */
 622   cxx0x
 623 };
 624
 625 /* The C++ dialect being used. C++98 is the default.  */
 626 extern enum cxx_dialect cxx_dialect;
 627
 628 /* Maximum template instantiation depth.  This limit is rather
 629    arbitrary, but it exists to limit the time it takes to notice
 630    infinite template instantiations.  */
 631
 632 extern int max_tinst_depth;
 633
 634 /* Nonzero means that we should not issue warnings about problems that
 635    occur when the code is executed, because the code being processed
 636    is not expected to be executed.  This is set during parsing.  This
 637    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 638    not a bool, because unexecuted expressions can nest.  */
 639
 640 extern int c_inhibit_evaluation_warnings;
 641
 642 /* Whether lexing has been completed, so subsequent preprocessor
 643    errors should use the compiler's input_location.  */
 644
 645 extern bool done_lexing;
 646
 647 /* C types are partitioned into three subsets: object, function, and
 648    incomplete types.  */
 649 #define C_TYPE_OBJECT_P(type) \
 650   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 651
 652 #define C_TYPE_INCOMPLETE_P(type) \
 653   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 654
 655 #define C_TYPE_FUNCTION_P(type) \
 656   (TREE_CODE (type) == FUNCTION_TYPE)
 657
 658 /* For convenience we define a single macro to identify the class of
 659    object or incomplete types.  */
 660 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 661   (!C_TYPE_FUNCTION_P (type))
 662
 663 /* Attribute table common to the C front ends.  */
 664 extern const struct attribute_spec c_common_attribute_table[];
 665 extern const struct attribute_spec c_common_format_attribute_table[];
 666
 667 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 668    ID is the identifier to use, NAME is the string.
 669    TYPE_DEP indicates whether it depends on type of the function or not
 670    (i.e. __PRETTY_FUNCTION__).  */
 671
 672 extern tree (*make_fname_decl) (location_t, tree, int);
 673
 674 /* In c-decl.c and cp/tree.c.  FIXME.  */
 675 extern void c_register_addr_space (const char *str, addr_space_t as);
 676
 677 /* In c-common.c.  */
 678 extern const char *c_addr_space_name (addr_space_t as);
 679 extern tree identifier_global_value (tree);
 680 extern void record_builtin_type (enum rid, const char *, tree);
 681 extern tree build_void_list_node (void);
 682 extern void start_fname_decls (void);
 683 extern void finish_fname_decls (void);
 684 extern const char *fname_as_string (int);
 685 extern tree fname_decl (location_t, unsigned, tree);
 686
 687 extern void check_function_arguments (tree, int, tree *, tree);
 688 extern void check_function_arguments_recurse (void (*)
 689                                               (void *, tree,
 690                                                unsigned HOST_WIDE_INT),
 691                                               void *, tree,
 692                                               unsigned HOST_WIDE_INT);
 693 extern bool check_builtin_function_arguments (tree, int, tree *);
 694 extern void check_function_format (tree, int, tree *);
 695 extern void set_Wformat (int);
 696 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 697 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 698 extern bool attribute_takes_identifier_p (const_tree);
 699 extern bool c_common_handle_option (size_t, const char *, int, int,
 700                                     const struct cl_option_handlers *);
 701 extern tree c_common_type_for_mode (enum machine_mode, int);
 702 extern tree c_common_type_for_size (unsigned int, int);
 703 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 704                                                 int, int);
 705 extern tree c_common_unsigned_type (tree);
 706 extern tree c_common_signed_type (tree);
 707 extern tree c_common_signed_or_unsigned_type (int, tree);
 708 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 709 extern bool decl_with_nonnull_addr_p (const_tree);
 710 extern tree c_fully_fold (tree, bool, bool *);
 711 extern tree decl_constant_value_for_optimization (tree);
 712 extern tree c_wrap_maybe_const (tree, bool);
 713 extern tree c_save_expr (tree);
 714 extern tree c_common_truthvalue_conversion (location_t, tree);
 715 extern void c_apply_type_quals_to_decl (int, tree);
 716 extern tree c_sizeof_or_alignof_type (location_t, tree, bool, int);
 717 extern tree c_alignof_expr (location_t, tree);
 718 /* Print an error message for invalid operands to arith operation CODE.
 719    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 720 extern void binary_op_error (location_t, enum tree_code, tree, tree);
 721 extern tree fix_string_type (tree);
 722 extern void constant_expression_warning (tree);
 723 extern void constant_expression_error (tree);
 724 extern bool strict_aliasing_warning (tree, tree, tree);
 725 extern void warnings_for_convert_and_check (tree, tree, tree);
 726 extern tree convert_and_check (tree, tree);
 727 extern void overflow_warning (location_t, tree);
 728 extern void warn_logical_operator (location_t, enum tree_code, tree,
 729                                    enum tree_code, tree, enum tree_code, tree);
 730 extern void check_main_parameter_types (tree decl);
 731 extern bool c_determine_visibility (tree);
 732 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 733 extern void mark_valid_location_for_stdc_pragma (bool);
 734 extern bool valid_location_for_stdc_pragma_p (void);
 735 extern void set_float_const_decimal64 (void);
 736 extern void clear_float_const_decimal64 (void);
 737 extern bool float_const_decimal64_p (void);
 738
 739 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, 1)
 740 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, 1)
 741
 742 /* Subroutine of build_binary_op, used for certain operations.  */
 743 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 744
 745 /* Subroutine of build_binary_op, used for comparison operations.
 746    See if the operands have both been converted from subword integer types
 747    and, if so, perhaps change them both back to their original type.  */
 748 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 749
 750 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree);
 751
 752 /* Add qualifiers to a type, in the fashion for C.  */
 753 extern tree c_build_qualified_type (tree, int);
 754
 755 /* Build tree nodes and builtin functions common to both C and C++ language
 756    frontends.  */
 757 extern void c_common_nodes_and_builtins (void);
 758
 759 extern void disable_builtin_function (const char *);
 760
 761 extern void set_compound_literal_name (tree decl);
 762
 763 extern tree build_va_arg (location_t, tree, tree);
 764
 765 extern unsigned int c_common_option_lang_mask (void);
 766 extern void c_common_initialize_diagnostics (diagnostic_context *);
 767 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 768 extern void c_common_init_options_struct (struct gcc_options *);
 769 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 770 extern bool c_common_post_options (const char **);
 771 extern bool c_common_init (void);
 772 extern void c_common_finish (void);
 773 extern void c_common_parse_file (int);
 774 extern alias_set_type c_common_get_alias_set (tree);
 775 extern void c_register_builtin_type (tree, const char*);
 776 extern bool c_promoting_integer_type_p (const_tree);
 777 extern int self_promoting_args_p (const_tree);
 778 extern tree strip_pointer_operator (tree);
 779 extern tree strip_pointer_or_array_types (tree);
 780 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 781
 782 /* This is the basic parsing function.  */
 783 extern void c_parse_file (void);
 784
 785 extern void warn_for_omitted_condop (location_t, tree);
 786
 787 /* These macros provide convenient access to the various _STMT nodes.  */
 788
 789 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 790    if a statement expression.  */
 791 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 792   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 793
 794 /* Nonzero if a label has been added to the statement list.  */
 795 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 796   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 797
 798 /* C_MAYBE_CONST_EXPR accessors.  */
 799 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
 800   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
 801 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
 802   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
 803 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
 804   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 805 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
 806   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 807 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
 808   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
 809    && (TREE_CODE (EXPR) == INTEGER_CST                  \
 810        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
 811            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
 812
 813 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 814 #define DECL_C_BIT_FIELD(NODE) \
 815   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 816 #define SET_DECL_C_BIT_FIELD(NODE) \
 817   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 818 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 819   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 820
 821 extern tree do_case (location_t, tree, tree);
 822 extern tree build_stmt (location_t, enum tree_code, ...);
 823 extern tree build_case_label (location_t, tree, tree, tree);
 824
 825 /* These functions must be defined by each front-end which implements
 826    a variant of the C language.  They are used in c-common.c.  */
 827
 828 extern tree build_unary_op (location_t, enum tree_code, tree, int);
 829 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
 830 extern tree perform_integral_promotions (tree);
 831
 832 /* These functions must be defined by each front-end which implements
 833    a variant of the C language.  They are used by port files.  */
 834
 835 extern tree default_conversion (tree);
 836
 837 /* Given two integer or real types, return the type for their sum.
 838    Given two compatible ANSI C types, returns the merged type.  */
 839
 840 extern tree common_type (tree, tree);
 841
 842 extern tree decl_constant_value (tree);
 843
 844 /* Handle increment and decrement of boolean types.  */
 845 extern tree boolean_increment (enum tree_code, tree);
 846
 847 extern int case_compare (splay_tree_key, splay_tree_key);
 848
 849 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree, tree);
 850
 851 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 852
 853 extern tree build_function_call (location_t, tree, tree);
 854
 855 extern tree build_function_call_vec (location_t, tree,
 856                                      VEC(tree,gc) *, VEC(tree,gc) *);
 857
 858 extern tree resolve_overloaded_builtin (location_t, tree, VEC(tree,gc) *);
 859
 860 extern tree finish_label_address_expr (tree, location_t);
 861
 862 /* Same function prototype, but the C and C++ front ends have
 863    different implementations.  Used in c-common.c.  */
 864 extern tree lookup_label (tree);
 865 extern tree lookup_name (tree);
 866 extern bool lvalue_p (const_tree);
 867
 868 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
 869 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 870
 871 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 872
 873 extern void init_c_lex (void);
 874
 875 extern void c_cpp_builtins (cpp_reader *);
 876 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
 877 extern bool c_cpp_error (cpp_reader *, int, int, location_t, unsigned int,
 878                          const char *, va_list *)
 879      ATTRIBUTE_GCC_DIAG(6,0);
 880
 881 /* Positive if an implicit `extern "C"' scope has just been entered;
 882    negative if such a scope has just been exited.  */
 883 extern GTY(()) int pending_lang_change;
 884
 885 /* Information recorded about each file examined during compilation.  */
 886
 887 struct c_fileinfo
 888 {
 889   int time;     /* Time spent in the file.  */
 890
 891   /* Flags used only by C++.
 892      INTERFACE_ONLY nonzero means that we are in an "interface" section
 893      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 894      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 895      INTERFACE_ONLY is zero, it means that we are responsible for
 896      exporting definitions that others might need.  */
 897   short interface_only;
 898   short interface_unknown;
 899 };
 900
 901 struct c_fileinfo *get_fileinfo (const char *);
 902 extern void dump_time_statistics (void);
 903
 904 extern bool c_dump_tree (void *, tree);
 905
 906 extern void verify_sequence_points (tree);
 907
 908 extern tree fold_offsetof (tree, tree);
 909
 910 /* Places where an lvalue, or modifiable lvalue, may be required.
 911    Used to select diagnostic messages in lvalue_error and
 912    readonly_error.  */
 913 enum lvalue_use {
 914   lv_assign,
 915   lv_increment,
 916   lv_decrement,
 917   lv_addressof,
 918   lv_asm
 919 };
 920
 921 extern void lvalue_error (enum lvalue_use);
 922
 923 extern int complete_array_type (tree *, tree, bool);
 924
 925 extern tree builtin_type_for_size (int, bool);
 926
 927 extern void c_common_mark_addressable_vec (tree);
 928
 929 extern void warn_array_subscript_with_type_char (tree);
 930 extern void warn_about_parentheses (enum tree_code,
 931                                     enum tree_code, tree,
 932                                     enum tree_code, tree);
 933 extern void warn_for_unused_label (tree label);
 934 extern void warn_for_div_by_zero (location_t, tree divisor);
 935 extern void warn_for_sign_compare (location_t,
 936                                    tree orig_op0, tree orig_op1,
 937                                    tree op0, tree op1,
 938                                    tree result_type,
 939                                    enum tree_code resultcode);
 940 extern void do_warn_double_promotion (tree, tree, tree, const char *,
 941                                       location_t);
 942 extern void set_underlying_type (tree x);
 943 extern VEC(tree,gc) *make_tree_vector (void);
 944 extern void release_tree_vector (VEC(tree,gc) *);
 945 extern VEC(tree,gc) *make_tree_vector_single (tree);
 946 extern VEC(tree,gc) *make_tree_vector_copy (const VEC(tree,gc) *);
 947
 948 /* In c-gimplify.c  */
 949 extern void c_genericize (tree);
 950 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
 951 extern tree c_build_bind_expr (location_t, tree, tree);
 952
 953 /* In c-pch.c  */
 954 extern void pch_init (void);
 955 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 956 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 957                                const char *orig);
 958 extern void c_common_write_pch (void);
 959 extern void c_common_no_more_pch (void);
 960 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
 961 extern void c_common_print_pch_checksum (FILE *f);
 962
 963 /* In *-checksum.c */
 964 extern const unsigned char executable_checksum[16];
 965
 966 /* In c-cppbuiltin.c  */
 967 extern void builtin_define_std (const char *macro);
 968 extern void builtin_define_with_value (const char *, const char *, int);
 969 extern void c_stddef_cpp_builtins (void);
 970 extern void fe_file_change (const struct line_map *);
 971 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char);
 972
 973 /* Objective-C / Objective-C++ entry points.  */
 974
 975 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 976    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 977 extern void objc_write_global_declarations (void);
 978 extern tree objc_is_class_name (tree);
 979 extern tree objc_is_object_ptr (tree);
 980 extern void objc_check_decl (tree);
 981 extern void objc_check_global_decl (tree);
 982 extern tree objc_common_type (tree, tree);
 983 extern tree objc_non_volatilized_type (tree);
 984 extern bool objc_compare_types (tree, tree, int, tree);
 985 extern bool objc_have_common_type (tree, tree, int, tree);
 986 extern bool objc_diagnose_private_ivar (tree);
 987 extern void objc_volatilize_decl (tree);
 988 extern bool objc_type_quals_match (tree, tree);
 989 extern tree objc_rewrite_function_call (tree, tree);
 990 extern tree objc_message_selector (void);
 991 extern tree objc_lookup_ivar (tree, tree);
 992 extern void objc_clear_super_receiver (void);
 993 extern int objc_is_public (tree, tree);
 994 extern tree objc_is_id (tree);
 995 extern void objc_declare_alias (tree, tree);
 996 extern void objc_declare_class (tree);
 997 extern void objc_declare_protocols (tree);
 998 extern tree objc_build_message_expr (tree);
 999 extern tree objc_finish_message_expr (tree, tree, tree);
1000 extern tree objc_build_selector_expr (location_t, tree);
1001 extern tree objc_build_protocol_expr (tree);
1002 extern tree objc_build_encode_expr (tree);
1003 extern tree objc_build_string_object (tree);
1004 extern tree objc_get_protocol_qualified_type (tree, tree);
1005 extern tree objc_get_class_reference (tree);
1006 extern tree objc_get_class_ivars (tree);
1007 extern tree objc_get_interface_ivars (tree);
1008 extern void objc_start_class_interface (tree, tree, tree, tree);
1009 extern void objc_start_category_interface (tree, tree, tree, tree);
1010 extern void objc_start_protocol (tree, tree, tree);
1011 extern void objc_continue_interface (void);
1012 extern void objc_finish_interface (void);
1013 extern void objc_start_class_implementation (tree, tree);
1014 extern void objc_start_category_implementation (tree, tree);
1015 extern void objc_continue_implementation (void);
1016 extern void objc_finish_implementation (void);
1017 extern void objc_set_visibility (objc_ivar_visibility_kind);
1018 extern tree objc_build_method_signature (bool, tree, tree, tree, bool);
1019 extern void objc_add_method_declaration (bool, tree, tree);
1020 extern bool objc_start_method_definition (bool, tree, tree);
1021 extern void objc_finish_method_definition (tree);
1022 extern void objc_add_instance_variable (tree);
1023 extern tree objc_build_keyword_decl (tree, tree, tree, tree);
1024 extern tree objc_build_throw_stmt (location_t, tree);
1025 extern void objc_begin_try_stmt (location_t, tree);
1026 extern tree objc_finish_try_stmt (void);
1027 extern void objc_begin_catch_clause (tree);
1028 extern void objc_finish_catch_clause (void);
1029 extern void objc_build_finally_clause (location_t, tree);
1030 extern tree objc_build_synchronized (location_t, tree, tree);
1031 extern int objc_static_init_needed_p (void);
1032 extern tree objc_generate_static_init_call (tree);
1033 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
1034 extern void objc_set_method_opt (bool);
1035 extern void objc_finish_foreach_loop (location_t, tree, tree, tree, tree, tree);
1036 extern bool  objc_method_decl (enum tree_code);
1037 extern void objc_add_property_declaration (location_t, tree, bool, bool, bool,
1038                                            bool, bool, bool, tree, tree);
1039 extern tree objc_maybe_build_component_ref (tree, tree);
1040 extern tree objc_build_class_component_ref (tree, tree);
1041 extern tree objc_maybe_build_modify_expr (tree, tree);
1042 extern void objc_add_synthesize_declaration (location_t, tree);
1043 extern void objc_add_dynamic_declaration (location_t, tree);
1044 extern const char * objc_maybe_printable_name (tree, int);
1045 extern bool objc_is_property_ref (tree);
1046 extern bool objc_string_ref_type_p (tree);
1047 extern void objc_check_format_arg (tree, tree);
1048
1049 /* The following are provided by the C and C++ front-ends, and called by
1050    ObjC/ObjC++.  */
1051 extern void *objc_get_current_scope (void);
1052 extern void objc_mark_locals_volatile (void *);
1053
1054 /* In c-ppoutput.c  */
1055 extern void init_pp_output (FILE *);
1056 extern void preprocess_file (cpp_reader *);
1057 extern void pp_file_change (const struct line_map *);
1058 extern void pp_dir_change (cpp_reader *, const char *);
1059 extern bool check_missing_format_attribute (tree, tree);
1060
1061 /* In c-omp.c  */
1062 extern tree c_finish_omp_master (location_t, tree);
1063 extern tree c_finish_omp_critical (location_t, tree, tree);
1064 extern tree c_finish_omp_ordered (location_t, tree);
1065 extern void c_finish_omp_barrier (location_t);
1066 extern tree c_finish_omp_atomic (location_t, enum tree_code, tree, tree);
1067 extern void c_finish_omp_flush (location_t);
1068 extern void c_finish_omp_taskwait (location_t);
1069 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1070 extern void c_split_parallel_clauses (location_t, tree, tree *, tree *);
1071 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1072
1073 /* Not in c-omp.c; provided by the front end.  */
1074 extern bool c_omp_sharing_predetermined (tree);
1075 extern tree c_omp_remap_decl (tree, bool);
1076 extern void record_types_used_by_current_var_decl (tree);
1077
1078 #endif /* ! GCC_C_COMMON_H */