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