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, 2011
   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_LITERAL_TYPE,         RID_IS_POD,
 139   RID_IS_POLYMORPHIC,          RID_IS_STD_LAYOUT,
 140   RID_IS_TRIVIAL,              RID_IS_UNION,
 141   RID_UNDERLYING_TYPE,
 142
 143   /* C++0x */
 144   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 145
 146   /* Objective-C ("AT" reserved words - they are only keywords when
 147      they follow '@')  */
 148   RID_AT_ENCODE,   RID_AT_END,
 149   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 150   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 151   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 152   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 153   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 154   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 155   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 156   RID_AT_INTERFACE,
 157   RID_AT_IMPLEMENTATION,
 158
 159   /* Named address support, mapping the keyword to a particular named address
 160      number.  Named address space 0 is reserved for the generic address.  If
 161      there are more than 254 named addresses, the addr_space_t type will need
 162      to be grown from an unsigned char to unsigned short.  */
 163   RID_ADDR_SPACE_0,             /* generic address */
 164   RID_ADDR_SPACE_1,
 165   RID_ADDR_SPACE_2,
 166   RID_ADDR_SPACE_3,
 167   RID_ADDR_SPACE_4,
 168   RID_ADDR_SPACE_5,
 169   RID_ADDR_SPACE_6,
 170   RID_ADDR_SPACE_7,
 171   RID_ADDR_SPACE_8,
 172   RID_ADDR_SPACE_9,
 173   RID_ADDR_SPACE_10,
 174   RID_ADDR_SPACE_11,
 175   RID_ADDR_SPACE_12,
 176   RID_ADDR_SPACE_13,
 177   RID_ADDR_SPACE_14,
 178   RID_ADDR_SPACE_15,
 179
 180   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 181   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 182
 183   RID_MAX,
 184
 185   RID_FIRST_MODIFIER = RID_STATIC,
 186   RID_LAST_MODIFIER = RID_ONEWAY,
 187
 188   RID_FIRST_CXX0X = RID_CONSTEXPR,
 189   RID_LAST_CXX0X = RID_STATIC_ASSERT,
 190   RID_FIRST_AT = RID_AT_ENCODE,
 191   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 192   RID_FIRST_PQ = RID_IN,
 193   RID_LAST_PQ = RID_ONEWAY,
 194   RID_FIRST_PATTR = RID_GETTER,
 195   RID_LAST_PATTR = RID_NONATOMIC
 196 };
 197
 198 #define OBJC_IS_AT_KEYWORD(rid) \
 199   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 200    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 201
 202 #define OBJC_IS_PQ_KEYWORD(rid) \
 203   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 204    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 205
 206 #define OBJC_IS_PATTR_KEYWORD(rid) \
 207   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 208    (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)
 209
 210 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 211    'class') which are shared in a subtle way between Objective-C and
 212    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 213    finds '@' followed by one of these identifiers (eg, '@class'), it
 214    recognizes the whole as an Objective-C keyword.  If the identifier
 215    is found elsewhere, it follows the rules of the C/C++ language.
 216  */
 217 #define OBJC_IS_CXX_KEYWORD(rid) \
 218   (rid == RID_CLASS                                                     \
 219    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 220    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 221
 222 /* The elements of `ridpointers' are identifier nodes for the reserved
 223    type names and storage classes.  It is indexed by a RID_... value.  */
 224 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 225
 226 /* Standard named or nameless data types of the C compiler.  */
 227
 228 enum c_tree_index
 229 {
 230     CTI_CHAR16_TYPE,
 231     CTI_CHAR32_TYPE,
 232     CTI_WCHAR_TYPE,
 233     CTI_UNDERLYING_WCHAR_TYPE,
 234     CTI_WINT_TYPE,
 235     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 236     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 237     CTI_INTMAX_TYPE,
 238     CTI_UINTMAX_TYPE,
 239     CTI_WIDEST_INT_LIT_TYPE,
 240     CTI_WIDEST_UINT_LIT_TYPE,
 241
 242     /* Types for <stdint.h>, that may not be defined on all
 243        targets.  */
 244     CTI_SIG_ATOMIC_TYPE,
 245     CTI_INT8_TYPE,
 246     CTI_INT16_TYPE,
 247     CTI_INT32_TYPE,
 248     CTI_INT64_TYPE,
 249     CTI_UINT8_TYPE,
 250     CTI_UINT16_TYPE,
 251     CTI_UINT32_TYPE,
 252     CTI_UINT64_TYPE,
 253     CTI_INT_LEAST8_TYPE,
 254     CTI_INT_LEAST16_TYPE,
 255     CTI_INT_LEAST32_TYPE,
 256     CTI_INT_LEAST64_TYPE,
 257     CTI_UINT_LEAST8_TYPE,
 258     CTI_UINT_LEAST16_TYPE,
 259     CTI_UINT_LEAST32_TYPE,
 260     CTI_UINT_LEAST64_TYPE,
 261     CTI_INT_FAST8_TYPE,
 262     CTI_INT_FAST16_TYPE,
 263     CTI_INT_FAST32_TYPE,
 264     CTI_INT_FAST64_TYPE,
 265     CTI_UINT_FAST8_TYPE,
 266     CTI_UINT_FAST16_TYPE,
 267     CTI_UINT_FAST32_TYPE,
 268     CTI_UINT_FAST64_TYPE,
 269     CTI_INTPTR_TYPE,
 270     CTI_UINTPTR_TYPE,
 271
 272     CTI_CHAR_ARRAY_TYPE,
 273     CTI_CHAR16_ARRAY_TYPE,
 274     CTI_CHAR32_ARRAY_TYPE,
 275     CTI_WCHAR_ARRAY_TYPE,
 276     CTI_INT_ARRAY_TYPE,
 277     CTI_STRING_TYPE,
 278     CTI_CONST_STRING_TYPE,
 279
 280     /* Type for boolean expressions (bool in C++, int in C).  */
 281     CTI_TRUTHVALUE_TYPE,
 282     CTI_TRUTHVALUE_TRUE,
 283     CTI_TRUTHVALUE_FALSE,
 284
 285     CTI_DEFAULT_FUNCTION_TYPE,
 286
 287     /* These are not types, but we have to look them up all the time.  */
 288     CTI_FUNCTION_NAME_DECL,
 289     CTI_PRETTY_FUNCTION_NAME_DECL,
 290     CTI_C99_FUNCTION_NAME_DECL,
 291     CTI_SAVED_FUNCTION_NAME_DECLS,
 292
 293     CTI_VOID_ZERO,
 294
 295     CTI_NULL,
 296
 297     CTI_MAX
 298 };
 299
 300 #define C_CPP_HASHNODE(id) \
 301   (&(((struct c_common_identifier *) (id))->node))
 302 #define C_RID_CODE(id) \
 303   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 304 #define C_SET_RID_CODE(id, code) \
 305   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 306
 307 /* Identifier part common to the C front ends.  Inherits from
 308    tree_identifier, despite appearances.  */
 309 struct GTY(()) c_common_identifier {
 310   struct tree_common common;
 311   struct cpp_hashnode node;
 312 };
 313
 314 /* An entry in the reserved keyword table.  */
 315
 316 struct c_common_resword
 317 {
 318   const char *const word;
 319   ENUM_BITFIELD(rid) const rid : 16;
 320   const unsigned int disable   : 16;
 321 };
 322
 323 /* Extra cpp_ttype values for C++.  */
 324
 325 /* A token type for keywords, as opposed to ordinary identifiers.  */
 326 #define CPP_KEYWORD ((enum cpp_ttype) (N_TTYPES + 1))
 327
 328 /* A token type for template-ids.  If a template-id is processed while
 329    parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
 330    the value of the CPP_TEMPLATE_ID is whatever was returned by
 331    cp_parser_template_id.  */
 332 #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
 333
 334 /* A token type for nested-name-specifiers.  If a
 335    nested-name-specifier is processed while parsing tentatively, it is
 336    replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
 337    CPP_NESTED_NAME_SPECIFIER is whatever was returned by
 338    cp_parser_nested_name_specifier_opt.  */
 339 #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
 340
 341 /* A token type for pre-parsed C++0x decltype.  */
 342 #define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
 343
 344 /* The number of token types, including C++-specific ones.  */
 345 #define N_CP_TTYPES ((int) (CPP_DECLTYPE + 1))
 346
 347 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 348    mask) is _true_.  Thus for keywords which are present in all
 349    languages the disable field is zero.  */
 350
 351 #define D_CONLY         0x001   /* C only (not in C++).  */
 352 #define D_CXXONLY       0x002   /* C++ only (not in C).  */
 353 #define D_C99           0x004   /* In C, C99 only.  */
 354 #define D_CXX0X         0x008   /* In C++, C++0X only.  */
 355 #define D_EXT           0x010   /* GCC extension.  */
 356 #define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
 357 #define D_ASM           0x040   /* Disabled by -fno-asm.  */
 358 #define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
 359 #define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
 360 #define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
 361
 362 /* The reserved keyword table.  */
 363 extern const struct c_common_resword c_common_reswords[];
 364
 365 /* The number of items in the reserved keyword table.  */
 366 extern const unsigned int num_c_common_reswords;
 367
 368 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 369 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 370 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 371 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 372 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 373 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 374 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 375 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 376 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 377 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 378 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 379
 380 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 381 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 382 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 383 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 384 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 385 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 386 #define uint16_type_node                c_global_trees[CTI_UINT16_TYPE]
 387 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 388 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 389 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 390 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 391 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 392 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 393 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 394 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 395 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 396 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 397 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 398 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 399 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 400 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 401 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 402 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 403 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 404 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 405 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 406 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 407
 408 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 409 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 410 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 411
 412 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 413 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 414 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 415 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 416 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 417 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 418 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 419
 420 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 421
 422 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 423 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 424 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 425 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 426
 427 /* A node for `((void) 0)'.  */
 428 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 429
 430 /* The node for C++ `__null'.  */
 431 #define null_node                       c_global_trees[CTI_NULL]
 432
 433 extern GTY(()) tree c_global_trees[CTI_MAX];
 434
 435 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 436    tree for size reasons.  */
 437 struct GTY((variable_size)) sorted_fields_type {
 438   int len;
 439   tree GTY((length ("%h.len"))) elts[1];
 440 };
 441
 442 /* Mark which labels are explicitly declared.
 443    These may be shadowed, and may be referenced from nested functions.  */
 444 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 445
 446 typedef enum c_language_kind
 447 {
 448   clk_c         = 0,            /* C90, C94 or C99 */
 449   clk_objc      = 1,            /* clk_c with ObjC features.  */
 450   clk_cxx       = 2,            /* ANSI/ISO C++ */
 451   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 452 }
 453 c_language_kind;
 454
 455 /* To test for a specific language use c_language, defined by each
 456    front end.  For "ObjC features" or "not C++" use the macros.  */
 457 extern c_language_kind c_language;
 458
 459 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 460 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 461
 462 /* The various name of operator that appears in error messages. */
 463 typedef enum ref_operator {
 464   /* NULL */
 465   RO_NULL,
 466   /* array indexing */
 467   RO_ARRAY_INDEXING,
 468   /* unary * */
 469   RO_UNARY_STAR,
 470   /* -> */
 471   RO_ARROW,
 472   /* implicit conversion */
 473   RO_IMPLICIT_CONVERSION
 474 } ref_operator;
 475
 476 /* Information about a statement tree.  */
 477
 478 struct GTY(()) stmt_tree_s {
 479   /* A stack of statement lists being collected.  */
 480   VEC(tree,gc) *x_cur_stmt_list;
 481
 482   /* In C++, Nonzero if we should treat statements as full
 483      expressions.  In particular, this variable is no-zero if at the
 484      end of a statement we should destroy any temporaries created
 485      during that statement.  Similarly, if, at the end of a block, we
 486      should destroy any local variables in this block.  Normally, this
 487      variable is nonzero, since those are the normal semantics of
 488      C++.
 489
 490      However, in order to represent aggregate initialization code as
 491      tree structure, we use statement-expressions.  The statements
 492      within the statement expression should not result in cleanups
 493      being run until the entire enclosing statement is complete.
 494
 495      This flag has no effect in C.  */
 496   int stmts_are_full_exprs_p;
 497 };
 498
 499 typedef struct stmt_tree_s *stmt_tree;
 500
 501 /* Global state pertinent to the current function.  Some C dialects
 502    extend this structure with additional fields.  */
 503
 504 struct GTY(()) c_language_function {
 505   /* While we are parsing the function, this contains information
 506      about the statement-tree that we are building.  */
 507   struct stmt_tree_s x_stmt_tree;
 508 };
 509
 510 #define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
 511
 512 /* When building a statement-tree, this is the current statement list
 513    being collected.  We define it in this convoluted way, rather than
 514    using VEC_last, because it must be an lvalue.  */
 515
 516 #define cur_stmt_list                                                   \
 517   (*(VEC_address (tree, stmt_list_stack)                                \
 518      + VEC_length (tree, stmt_list_stack) - 1))
 519
 520 #define building_stmt_list_p() (!VEC_empty (tree, stmt_list_stack))
 521
 522 /* Language-specific hooks.  */
 523
 524 /* If non-NULL, this function is called after a precompile header file
 525    is loaded.  */
 526 extern void (*lang_post_pch_load) (void);
 527
 528 extern void push_file_scope (void);
 529 extern void pop_file_scope (void);
 530 extern stmt_tree current_stmt_tree (void);
 531 extern tree push_stmt_list (void);
 532 extern tree pop_stmt_list (tree);
 533 extern tree add_stmt (tree);
 534 extern void push_cleanup (tree, tree, bool);
 535 extern tree pushdecl_top_level (tree);
 536 extern tree pushdecl (tree);
 537 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 538                                location_t, tree, tree);
 539 extern tree build_indirect_ref (location_t, tree, ref_operator);
 540
 541 extern int c_expand_decl (tree);
 542
 543 extern int field_decl_cmp (const void *, const void *);
 544 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 545                                   void *);
 546 extern bool has_c_linkage (const_tree decl);
 547 \f
 548 /* Switches common to the C front ends.  */
 549
 550 /* Nonzero means don't output line number information.  */
 551
 552 extern char flag_no_line_commands;
 553
 554 /* Nonzero causes -E output not to be done, but directives such as
 555    #define that have side effects are still obeyed.  */
 556
 557 extern char flag_no_output;
 558
 559 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 560    'N' or 'U' of the command line switch.  */
 561
 562 extern char flag_dump_macros;
 563
 564 /* Nonzero means pass #include lines through to the output.  */
 565
 566 extern char flag_dump_includes;
 567
 568 /* Nonzero means process PCH files while preprocessing.  */
 569
 570 extern bool flag_pch_preprocess;
 571
 572 /* The file name to which we should write a precompiled header, or
 573    NULL if no header will be written in this compile.  */
 574
 575 extern const char *pch_file;
 576
 577 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 578    user's namespace.  */
 579
 580 extern int flag_iso;
 581
 582 /* Warn about #pragma directives that are not recognized.  */
 583
 584 extern int warn_unknown_pragmas; /* Tri state variable.  */
 585
 586 /* Warn about format/argument anomalies in calls to formatted I/O functions
 587    (*printf, *scanf, strftime, strfmon, etc.).  */
 588
 589 extern int warn_format;
 590
 591
 592 /* C/ObjC language option variables.  */
 593
 594
 595 /* Nonzero means allow type mismatches in conditional expressions;
 596    just make their values `void'.  */
 597
 598 extern int flag_cond_mismatch;
 599
 600 /* Nonzero means enable C89 Amendment 1 features.  */
 601
 602 extern int flag_isoc94;
 603
 604 /* Nonzero means use the ISO C99 (or C1X) dialect of C.  */
 605
 606 extern int flag_isoc99;
 607
 608 /* Nonzero means use the ISO C1X dialect of C.  */
 609
 610 extern int flag_isoc1x;
 611
 612 /* Nonzero means that we have builtin functions, and main is an int.  */
 613
 614 extern int flag_hosted;
 615
 616 /* ObjC language option variables.  */
 617
 618
 619 /* Tells the compiler that this is a special run.  Do not perform any
 620    compiling, instead we are to test some platform dependent features
 621    and output a C header file with appropriate definitions.  */
 622
 623 extern int print_struct_values;
 624
 625 /* Tells the compiler what is the constant string class for ObjC.  */
 626
 627 extern const char *constant_string_class_name;
 628
 629
 630 /* C++ language option variables.  */
 631
 632
 633 /* Nonzero means generate separate instantiation control files and
 634    juggle them at link time.  */
 635
 636 extern int flag_use_repository;
 637
 638 /* The supported C++ dialects.  */
 639
 640 enum cxx_dialect {
 641   /* C++98  */
 642   cxx98,
 643   /* Experimental features that are likely to become part of
 644      C++0x.  */
 645   cxx0x
 646 };
 647
 648 /* The C++ dialect being used. C++98 is the default.  */
 649 extern enum cxx_dialect cxx_dialect;
 650
 651 /* Maximum template instantiation depth.  This limit is rather
 652    arbitrary, but it exists to limit the time it takes to notice
 653    excessively recursive template instantiations.  */
 654
 655 extern int max_tinst_depth;
 656
 657 /* Nonzero means that we should not issue warnings about problems that
 658    occur when the code is executed, because the code being processed
 659    is not expected to be executed.  This is set during parsing.  This
 660    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 661    not a bool, because unexecuted expressions can nest.  */
 662
 663 extern int c_inhibit_evaluation_warnings;
 664
 665 /* Whether lexing has been completed, so subsequent preprocessor
 666    errors should use the compiler's input_location.  */
 667
 668 extern bool done_lexing;
 669
 670 /* C types are partitioned into three subsets: object, function, and
 671    incomplete types.  */
 672 #define C_TYPE_OBJECT_P(type) \
 673   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 674
 675 #define C_TYPE_INCOMPLETE_P(type) \
 676   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 677
 678 #define C_TYPE_FUNCTION_P(type) \
 679   (TREE_CODE (type) == FUNCTION_TYPE)
 680
 681 /* For convenience we define a single macro to identify the class of
 682    object or incomplete types.  */
 683 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 684   (!C_TYPE_FUNCTION_P (type))
 685
 686 struct visibility_flags
 687 {
 688   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 689   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 690 };
 691
 692 /* Global visibility options.  */
 693 extern struct visibility_flags visibility_options;
 694
 695 /* Attribute table common to the C front ends.  */
 696 extern const struct attribute_spec c_common_attribute_table[];
 697 extern const struct attribute_spec c_common_format_attribute_table[];
 698
 699 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 700    ID is the identifier to use, NAME is the string.
 701    TYPE_DEP indicates whether it depends on type of the function or not
 702    (i.e. __PRETTY_FUNCTION__).  */
 703
 704 extern tree (*make_fname_decl) (location_t, tree, int);
 705
 706 /* In c-decl.c and cp/tree.c.  FIXME.  */
 707 extern void c_register_addr_space (const char *str, addr_space_t as);
 708
 709 /* In c-common.c.  */
 710 extern bool in_late_binary_op;
 711 extern const char *c_addr_space_name (addr_space_t as);
 712 extern tree identifier_global_value (tree);
 713 extern void record_builtin_type (enum rid, const char *, tree);
 714 extern tree build_void_list_node (void);
 715 extern void start_fname_decls (void);
 716 extern void finish_fname_decls (void);
 717 extern const char *fname_as_string (int);
 718 extern tree fname_decl (location_t, unsigned, tree);
 719
 720 extern void check_function_arguments (const_tree, int, tree *);
 721 extern void check_function_arguments_recurse (void (*)
 722                                               (void *, tree,
 723                                                unsigned HOST_WIDE_INT),
 724                                               void *, tree,
 725                                               unsigned HOST_WIDE_INT);
 726 extern bool check_builtin_function_arguments (tree, int, tree *);
 727 extern void check_function_format (tree, int, tree *);
 728 extern void set_Wformat (int);
 729 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 730 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 731 extern bool attribute_takes_identifier_p (const_tree);
 732 extern bool c_common_handle_option (size_t, const char *, int, int, location_t,
 733                                     const struct cl_option_handlers *);
 734 extern bool default_handle_c_option (size_t, const char *, int);
 735 extern tree c_common_type_for_mode (enum machine_mode, int);
 736 extern tree c_common_type_for_size (unsigned int, int);
 737 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 738                                                 int, int);
 739 extern tree c_common_unsigned_type (tree);
 740 extern tree c_common_signed_type (tree);
 741 extern tree c_common_signed_or_unsigned_type (int, tree);
 742 extern void c_common_init_ts (void);
 743 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 744 extern bool decl_with_nonnull_addr_p (const_tree);
 745 extern tree c_fully_fold (tree, bool, bool *);
 746 extern tree decl_constant_value_for_optimization (tree);
 747 extern tree c_wrap_maybe_const (tree, bool);
 748 extern tree c_save_expr (tree);
 749 extern tree c_common_truthvalue_conversion (location_t, tree);
 750 extern void c_apply_type_quals_to_decl (int, tree);
 751 extern tree c_sizeof_or_alignof_type (location_t, tree, bool, int);
 752 extern tree c_alignof_expr (location_t, tree);
 753 /* Print an error message for invalid operands to arith operation CODE.
 754    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 755 extern void binary_op_error (location_t, enum tree_code, tree, tree);
 756 extern tree fix_string_type (tree);
 757 extern void constant_expression_warning (tree);
 758 extern void constant_expression_error (tree);
 759 extern bool strict_aliasing_warning (tree, tree, tree);
 760 extern void warnings_for_convert_and_check (tree, tree, tree);
 761 extern tree convert_and_check (tree, tree);
 762 extern void overflow_warning (location_t, tree);
 763 extern void warn_logical_operator (location_t, enum tree_code, tree,
 764                                    enum tree_code, tree, enum tree_code, tree);
 765 extern void check_main_parameter_types (tree decl);
 766 extern bool c_determine_visibility (tree);
 767 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 768 extern void mark_valid_location_for_stdc_pragma (bool);
 769 extern bool valid_location_for_stdc_pragma_p (void);
 770 extern void set_float_const_decimal64 (void);
 771 extern void clear_float_const_decimal64 (void);
 772 extern bool float_const_decimal64_p (void);
 773
 774 extern bool keyword_begins_type_specifier (enum rid);
 775 extern bool keyword_is_storage_class_specifier (enum rid);
 776 extern bool keyword_is_type_qualifier (enum rid);
 777 extern bool keyword_is_decl_specifier (enum rid);
 778
 779 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, 1)
 780 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, 1)
 781
 782 /* Subroutine of build_binary_op, used for certain operations.  */
 783 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 784
 785 /* Subroutine of build_binary_op, used for comparison operations.
 786    See if the operands have both been converted from subword integer types
 787    and, if so, perhaps change them both back to their original type.  */
 788 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 789
 790 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree);
 791
 792 /* Add qualifiers to a type, in the fashion for C.  */
 793 extern tree c_build_qualified_type (tree, int);
 794
 795 /* Build tree nodes and builtin functions common to both C and C++ language
 796    frontends.  */
 797 extern void c_common_nodes_and_builtins (void);
 798
 799 extern void disable_builtin_function (const char *);
 800
 801 extern void set_compound_literal_name (tree decl);
 802
 803 extern tree build_va_arg (location_t, tree, tree);
 804
 805 extern const unsigned int c_family_lang_mask;
 806 extern unsigned int c_common_option_lang_mask (void);
 807 extern void c_common_initialize_diagnostics (diagnostic_context *);
 808 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 809 extern void c_common_init_options_struct (struct gcc_options *);
 810 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 811 extern bool c_common_post_options (const char **);
 812 extern bool c_common_init (void);
 813 extern void c_common_finish (void);
 814 extern void c_common_parse_file (void);
 815 extern alias_set_type c_common_get_alias_set (tree);
 816 extern void c_register_builtin_type (tree, const char*);
 817 extern bool c_promoting_integer_type_p (const_tree);
 818 extern int self_promoting_args_p (const_tree);
 819 extern tree strip_pointer_operator (tree);
 820 extern tree strip_pointer_or_array_types (tree);
 821 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 822
 823 /* This is the basic parsing function.  */
 824 extern void c_parse_file (void);
 825
 826 extern void warn_for_omitted_condop (location_t, tree);
 827
 828 /* These macros provide convenient access to the various _STMT nodes.  */
 829
 830 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 831    if a statement expression.  */
 832 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 833   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 834
 835 /* Nonzero if a label has been added to the statement list.  */
 836 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 837   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 838
 839 /* C_MAYBE_CONST_EXPR accessors.  */
 840 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
 841   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
 842 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
 843   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
 844 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
 845   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 846 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
 847   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 848 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
 849   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
 850    && (TREE_CODE (EXPR) == INTEGER_CST                  \
 851        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
 852            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
 853
 854 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 855 #define DECL_C_BIT_FIELD(NODE) \
 856   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 857 #define SET_DECL_C_BIT_FIELD(NODE) \
 858   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 859 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 860   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 861
 862 extern tree do_case (location_t, tree, tree);
 863 extern tree build_stmt (location_t, enum tree_code, ...);
 864 extern tree build_real_imag_expr (location_t, enum tree_code, tree);
 865
 866 /* These functions must be defined by each front-end which implements
 867    a variant of the C language.  They are used in c-common.c.  */
 868
 869 extern tree build_unary_op (location_t, enum tree_code, tree, int);
 870 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
 871 extern tree perform_integral_promotions (tree);
 872
 873 /* These functions must be defined by each front-end which implements
 874    a variant of the C language.  They are used by port files.  */
 875
 876 extern tree default_conversion (tree);
 877
 878 /* Given two integer or real types, return the type for their sum.
 879    Given two compatible ANSI C types, returns the merged type.  */
 880
 881 extern tree common_type (tree, tree);
 882
 883 extern tree decl_constant_value (tree);
 884
 885 /* Handle increment and decrement of boolean types.  */
 886 extern tree boolean_increment (enum tree_code, tree);
 887
 888 extern int case_compare (splay_tree_key, splay_tree_key);
 889
 890 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree, tree);
 891
 892 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 893
 894 extern tree build_function_call (location_t, tree, tree);
 895
 896 extern tree build_function_call_vec (location_t, tree,
 897                                      VEC(tree,gc) *, VEC(tree,gc) *);
 898
 899 extern tree resolve_overloaded_builtin (location_t, tree, VEC(tree,gc) *);
 900
 901 extern tree finish_label_address_expr (tree, location_t);
 902
 903 /* Same function prototype, but the C and C++ front ends have
 904    different implementations.  Used in c-common.c.  */
 905 extern tree lookup_label (tree);
 906 extern tree lookup_name (tree);
 907 extern bool lvalue_p (const_tree);
 908
 909 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
 910 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 911
 912 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 913
 914 extern void init_c_lex (void);
 915
 916 extern void c_cpp_builtins (cpp_reader *);
 917 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
 918 extern bool c_cpp_error (cpp_reader *, int, int, location_t, unsigned int,
 919                          const char *, va_list *)
 920      ATTRIBUTE_GCC_DIAG(6,0);
 921
 922 extern bool parse_optimize_options (tree, bool);
 923
 924 /* Positive if an implicit `extern "C"' scope has just been entered;
 925    negative if such a scope has just been exited.  */
 926 extern GTY(()) int pending_lang_change;
 927
 928 /* Information recorded about each file examined during compilation.  */
 929
 930 struct c_fileinfo
 931 {
 932   int time;     /* Time spent in the file.  */
 933
 934   /* Flags used only by C++.
 935      INTERFACE_ONLY nonzero means that we are in an "interface" section
 936      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 937      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 938      INTERFACE_ONLY is zero, it means that we are responsible for
 939      exporting definitions that others might need.  */
 940   short interface_only;
 941   short interface_unknown;
 942 };
 943
 944 struct c_fileinfo *get_fileinfo (const char *);
 945 extern void dump_time_statistics (void);
 946
 947 extern bool c_dump_tree (void *, tree);
 948
 949 extern void verify_sequence_points (tree);
 950
 951 extern tree fold_offsetof (tree, tree);
 952
 953 /* Places where an lvalue, or modifiable lvalue, may be required.
 954    Used to select diagnostic messages in lvalue_error and
 955    readonly_error.  */
 956 enum lvalue_use {
 957   lv_assign,
 958   lv_increment,
 959   lv_decrement,
 960   lv_addressof,
 961   lv_asm
 962 };
 963
 964 extern void readonly_error (tree, enum lvalue_use);
 965 extern void lvalue_error (location_t, enum lvalue_use);
 966 extern void invalid_indirection_error (location_t, tree, ref_operator);
 967
 968 extern int complete_array_type (tree *, tree, bool);
 969
 970 extern tree builtin_type_for_size (int, bool);
 971
 972 extern void c_common_mark_addressable_vec (tree);
 973
 974 extern void warn_array_subscript_with_type_char (tree);
 975 extern void warn_about_parentheses (enum tree_code,
 976                                     enum tree_code, tree,
 977                                     enum tree_code, tree);
 978 extern void warn_for_unused_label (tree label);
 979 extern void warn_for_div_by_zero (location_t, tree divisor);
 980 extern void warn_for_sign_compare (location_t,
 981                                    tree orig_op0, tree orig_op1,
 982                                    tree op0, tree op1,
 983                                    tree result_type,
 984                                    enum tree_code resultcode);
 985 extern void do_warn_double_promotion (tree, tree, tree, const char *,
 986                                       location_t);
 987 extern void set_underlying_type (tree x);
 988 extern VEC(tree,gc) *make_tree_vector (void);
 989 extern void release_tree_vector (VEC(tree,gc) *);
 990 extern VEC(tree,gc) *make_tree_vector_single (tree);
 991 extern VEC(tree,gc) *make_tree_vector_from_list (tree);
 992 extern VEC(tree,gc) *make_tree_vector_copy (const VEC(tree,gc) *);
 993
 994 /* In c-gimplify.c  */
 995 extern void c_genericize (tree);
 996 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
 997 extern tree c_build_bind_expr (location_t, tree, tree);
 998
 999 /* In c-pch.c  */
1000 extern void pch_init (void);
1001 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1002 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1003                                const char *orig);
1004 extern void c_common_write_pch (void);
1005 extern void c_common_no_more_pch (void);
1006 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1007 extern void c_common_print_pch_checksum (FILE *f);
1008
1009 /* In *-checksum.c */
1010 extern const unsigned char executable_checksum[16];
1011
1012 /* In c-cppbuiltin.c  */
1013 extern void builtin_define_std (const char *macro);
1014 extern void builtin_define_with_value (const char *, const char *, int);
1015 extern void c_stddef_cpp_builtins (void);
1016 extern void fe_file_change (const struct line_map *);
1017 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char);
1018
1019 /* In c-ppoutput.c  */
1020 extern void init_pp_output (FILE *);
1021 extern void preprocess_file (cpp_reader *);
1022 extern void pp_file_change (const struct line_map *);
1023 extern void pp_dir_change (cpp_reader *, const char *);
1024 extern bool check_missing_format_attribute (tree, tree);
1025
1026 /* In c-omp.c  */
1027 extern tree c_finish_omp_master (location_t, tree);
1028 extern tree c_finish_omp_critical (location_t, tree, tree);
1029 extern tree c_finish_omp_ordered (location_t, tree);
1030 extern void c_finish_omp_barrier (location_t);
1031 extern tree c_finish_omp_atomic (location_t, enum tree_code, tree, tree);
1032 extern void c_finish_omp_flush (location_t);
1033 extern void c_finish_omp_taskwait (location_t);
1034 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1035 extern void c_split_parallel_clauses (location_t, tree, tree *, tree *);
1036 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1037
1038 /* Not in c-omp.c; provided by the front end.  */
1039 extern bool c_omp_sharing_predetermined (tree);
1040 extern tree c_omp_remap_decl (tree, bool);
1041 extern void record_types_used_by_current_var_decl (tree);
1042
1043 /* Return next tree in the chain for chain_next walking of tree nodes.  */
1044 static inline tree
1045 c_tree_chain_next (tree t)
1046 {
1047   /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1048      kind of object, never a long chain of nodes.  Prefer
1049      TYPE_NEXT_VARIANT for types.  */
1050   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1051     return TYPE_NEXT_VARIANT (t);
1052   /* Otherwise, if there is TREE_CHAIN, return it.  */
1053   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1054     return TREE_CHAIN (t);
1055   return NULL;
1056 }
1057
1058 #endif /* ! GCC_C_COMMON_H */