gcc/c-family/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002,
   3    2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011, 2012
   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 #include "tree.h"
  29
  30 /* In order for the format checking to accept the C frontend
  31    diagnostic framework extensions, you must include this file before
  32    diagnostic-core.h, not after.  The C front end formats are a subset of those
  33    for C++, so they are the appropriate set to use in common code;
  34    cp-tree.h overrides this for C++.  */
  35 #if defined(GCC_DIAGNOSTIC_CORE_H)
  36 #error \
  37 In order for the format checking to accept the C front end diagnostic \
  38 framework extensions, you must include this file before diagnostic-core.h \
  39 never after.
  40 #endif
  41 #ifndef GCC_DIAG_STYLE
  42 #define GCC_DIAG_STYLE __gcc_cdiag__
  43 #endif
  44 #include "diagnostic-core.h"
  45
  46 /* Usage of TREE_LANG_FLAG_?:
  47    0: IDENTIFIER_MARKED (used by search routines).
  48       C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)
  49    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  50       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  51       C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)
  52    2: unused
  53    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  54    4: unused
  55 */
  56
  57 /* Reserved identifiers.  This is the union of all the keywords for C,
  58    C++, and Objective-C.  All the type modifiers have to be in one
  59    block at the beginning, because they are used as mask bits.  There
  60    are 28 type modifiers; if we add many more we will have to redesign
  61    the mask mechanism.  */
  62
  63 enum rid
  64 {
  65   /* Modifiers: */
  66   /* C, in empirical order of frequency.  */
  67   RID_STATIC = 0,
  68   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  69   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  70   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  71   RID_NORETURN,
  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,      RID_BUILTIN_COMPLEX,          RID_BUILTIN_SHUFFLE,
 106   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
 107   RID_FRACT, RID_ACCUM,
 108
 109   /* C11 */
 110   RID_ALIGNAS,
 111
 112   /* This means to warn that this is a C++ keyword, and then treat it
 113      as a normal identifier.  */
 114   RID_CXX_COMPAT_WARN,
 115
 116   /* GNU transactional memory extension */
 117   RID_TRANSACTION_ATOMIC, RID_TRANSACTION_RELAXED, RID_TRANSACTION_CANCEL,
 118
 119   /* Too many ways of getting the name of a function as a string */
 120   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
 121
 122   /* C++ (some of these are keywords in Objective-C as well, but only
 123      if they appear after a '@') */
 124   RID_BOOL,     RID_WCHAR,    RID_CLASS,
 125   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
 126   RID_TEMPLATE, RID_NULL,     RID_CATCH,
 127   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
 128   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
 129   RID_THIS,     RID_THROW,    RID_TRUE,
 130   RID_TRY,      RID_TYPENAME, RID_TYPEID,
 131   RID_USING,    RID_CHAR16,   RID_CHAR32,
 132
 133   /* casts */
 134   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
 135
 136   /* C++ extensions */
 137   RID_BASES,                   RID_DIRECT_BASES,
 138   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
 139   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
 140   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
 141   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_VIRTUAL_DESTRUCTOR,
 142   RID_IS_ABSTRACT,             RID_IS_BASE_OF,
 143   RID_IS_CLASS,                RID_IS_CONVERTIBLE_TO,
 144   RID_IS_EMPTY,                RID_IS_ENUM,
 145   RID_IS_FINAL,                RID_IS_LITERAL_TYPE,
 146   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 147   RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,
 148   RID_IS_UNION,                RID_UNDERLYING_TYPE,
 149
 150   /* C++11 */
 151   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 152
 153   /* Objective-C ("AT" reserved words - they are only keywords when
 154      they follow '@')  */
 155   RID_AT_ENCODE,   RID_AT_END,
 156   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 157   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 158   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 159   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 160   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 161   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 162   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 163   RID_AT_INTERFACE,
 164   RID_AT_IMPLEMENTATION,
 165
 166   /* Named address support, mapping the keyword to a particular named address
 167      number.  Named address space 0 is reserved for the generic address.  If
 168      there are more than 254 named addresses, the addr_space_t type will need
 169      to be grown from an unsigned char to unsigned short.  */
 170   RID_ADDR_SPACE_0,             /* generic address */
 171   RID_ADDR_SPACE_1,
 172   RID_ADDR_SPACE_2,
 173   RID_ADDR_SPACE_3,
 174   RID_ADDR_SPACE_4,
 175   RID_ADDR_SPACE_5,
 176   RID_ADDR_SPACE_6,
 177   RID_ADDR_SPACE_7,
 178   RID_ADDR_SPACE_8,
 179   RID_ADDR_SPACE_9,
 180   RID_ADDR_SPACE_10,
 181   RID_ADDR_SPACE_11,
 182   RID_ADDR_SPACE_12,
 183   RID_ADDR_SPACE_13,
 184   RID_ADDR_SPACE_14,
 185   RID_ADDR_SPACE_15,
 186
 187   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 188   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 189
 190   RID_MAX,
 191
 192   RID_FIRST_MODIFIER = RID_STATIC,
 193   RID_LAST_MODIFIER = RID_ONEWAY,
 194
 195   RID_FIRST_CXX0X = RID_CONSTEXPR,
 196   RID_LAST_CXX0X = RID_STATIC_ASSERT,
 197   RID_FIRST_AT = RID_AT_ENCODE,
 198   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 199   RID_FIRST_PQ = RID_IN,
 200   RID_LAST_PQ = RID_ONEWAY,
 201   RID_FIRST_PATTR = RID_GETTER,
 202   RID_LAST_PATTR = RID_NONATOMIC
 203 };
 204
 205 #define OBJC_IS_AT_KEYWORD(rid) \
 206   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 207    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 208
 209 #define OBJC_IS_PQ_KEYWORD(rid) \
 210   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 211    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 212
 213 #define OBJC_IS_PATTR_KEYWORD(rid) \
 214   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 215    (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)
 216
 217 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 218    'class') which are shared in a subtle way between Objective-C and
 219    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 220    finds '@' followed by one of these identifiers (eg, '@class'), it
 221    recognizes the whole as an Objective-C keyword.  If the identifier
 222    is found elsewhere, it follows the rules of the C/C++ language.
 223  */
 224 #define OBJC_IS_CXX_KEYWORD(rid) \
 225   (rid == RID_CLASS                                                     \
 226    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 227    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 228
 229 /* The elements of `ridpointers' are identifier nodes for the reserved
 230    type names and storage classes.  It is indexed by a RID_... value.  */
 231 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 232
 233 /* Standard named or nameless data types of the C compiler.  */
 234
 235 enum c_tree_index
 236 {
 237     CTI_CHAR16_TYPE,
 238     CTI_CHAR32_TYPE,
 239     CTI_WCHAR_TYPE,
 240     CTI_UNDERLYING_WCHAR_TYPE,
 241     CTI_WINT_TYPE,
 242     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 243     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 244     CTI_INTMAX_TYPE,
 245     CTI_UINTMAX_TYPE,
 246     CTI_WIDEST_INT_LIT_TYPE,
 247     CTI_WIDEST_UINT_LIT_TYPE,
 248
 249     /* Types for <stdint.h>, that may not be defined on all
 250        targets.  */
 251     CTI_SIG_ATOMIC_TYPE,
 252     CTI_INT8_TYPE,
 253     CTI_INT16_TYPE,
 254     CTI_INT32_TYPE,
 255     CTI_INT64_TYPE,
 256     CTI_UINT8_TYPE,
 257     CTI_UINT16_TYPE,
 258     CTI_UINT32_TYPE,
 259     CTI_UINT64_TYPE,
 260     CTI_INT_LEAST8_TYPE,
 261     CTI_INT_LEAST16_TYPE,
 262     CTI_INT_LEAST32_TYPE,
 263     CTI_INT_LEAST64_TYPE,
 264     CTI_UINT_LEAST8_TYPE,
 265     CTI_UINT_LEAST16_TYPE,
 266     CTI_UINT_LEAST32_TYPE,
 267     CTI_UINT_LEAST64_TYPE,
 268     CTI_INT_FAST8_TYPE,
 269     CTI_INT_FAST16_TYPE,
 270     CTI_INT_FAST32_TYPE,
 271     CTI_INT_FAST64_TYPE,
 272     CTI_UINT_FAST8_TYPE,
 273     CTI_UINT_FAST16_TYPE,
 274     CTI_UINT_FAST32_TYPE,
 275     CTI_UINT_FAST64_TYPE,
 276     CTI_INTPTR_TYPE,
 277     CTI_UINTPTR_TYPE,
 278
 279     CTI_CHAR_ARRAY_TYPE,
 280     CTI_CHAR16_ARRAY_TYPE,
 281     CTI_CHAR32_ARRAY_TYPE,
 282     CTI_WCHAR_ARRAY_TYPE,
 283     CTI_INT_ARRAY_TYPE,
 284     CTI_STRING_TYPE,
 285     CTI_CONST_STRING_TYPE,
 286
 287     /* Type for boolean expressions (bool in C++, int in C).  */
 288     CTI_TRUTHVALUE_TYPE,
 289     CTI_TRUTHVALUE_TRUE,
 290     CTI_TRUTHVALUE_FALSE,
 291
 292     CTI_DEFAULT_FUNCTION_TYPE,
 293
 294     /* These are not types, but we have to look them up all the time.  */
 295     CTI_FUNCTION_NAME_DECL,
 296     CTI_PRETTY_FUNCTION_NAME_DECL,
 297     CTI_C99_FUNCTION_NAME_DECL,
 298     CTI_SAVED_FUNCTION_NAME_DECLS,
 299
 300     CTI_VOID_ZERO,
 301
 302     CTI_NULL,
 303
 304     CTI_MAX
 305 };
 306
 307 #define C_CPP_HASHNODE(id) \
 308   (&(((struct c_common_identifier *) (id))->node))
 309 #define C_RID_CODE(id) \
 310   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 311 #define C_SET_RID_CODE(id, code) \
 312   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 313
 314 /* Identifier part common to the C front ends.  Inherits from
 315    tree_identifier, despite appearances.  */
 316 struct GTY(()) c_common_identifier {
 317   struct tree_common common;
 318   struct cpp_hashnode node;
 319 };
 320
 321 /* An entry in the reserved keyword table.  */
 322
 323 struct c_common_resword
 324 {
 325   const char *const word;
 326   ENUM_BITFIELD(rid) const rid : 16;
 327   const unsigned int disable   : 16;
 328 };
 329
 330 /* Extra cpp_ttype values for C++.  */
 331
 332 /* A token type for keywords, as opposed to ordinary identifiers.  */
 333 #define CPP_KEYWORD ((enum cpp_ttype) (N_TTYPES + 1))
 334
 335 /* A token type for template-ids.  If a template-id is processed while
 336    parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
 337    the value of the CPP_TEMPLATE_ID is whatever was returned by
 338    cp_parser_template_id.  */
 339 #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
 340
 341 /* A token type for nested-name-specifiers.  If a
 342    nested-name-specifier is processed while parsing tentatively, it is
 343    replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
 344    CPP_NESTED_NAME_SPECIFIER is whatever was returned by
 345    cp_parser_nested_name_specifier_opt.  */
 346 #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
 347
 348 /* A token type for pre-parsed C++0x decltype.  */
 349 #define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
 350
 351 /* The number of token types, including C++-specific ones.  */
 352 #define N_CP_TTYPES ((int) (CPP_DECLTYPE + 1))
 353
 354 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 355    mask) is _true_.  Thus for keywords which are present in all
 356    languages the disable field is zero.  */
 357
 358 #define D_CONLY         0x001   /* C only (not in C++).  */
 359 #define D_CXXONLY       0x002   /* C++ only (not in C).  */
 360 #define D_C99           0x004   /* In C, C99 only.  */
 361 #define D_CXX0X         0x008   /* In C++, C++0X only.  */
 362 #define D_EXT           0x010   /* GCC extension.  */
 363 #define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
 364 #define D_ASM           0x040   /* Disabled by -fno-asm.  */
 365 #define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
 366 #define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
 367 #define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
 368
 369 /* The reserved keyword table.  */
 370 extern const struct c_common_resword c_common_reswords[];
 371
 372 /* The number of items in the reserved keyword table.  */
 373 extern const unsigned int num_c_common_reswords;
 374
 375 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 376 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 377 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 378 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 379 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 380 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 381 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 382 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 383 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 384 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 385 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 386
 387 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 388 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 389 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 390 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 391 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 392 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 393 #define c_uint16_type_node              c_global_trees[CTI_UINT16_TYPE]
 394 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 395 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 396 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 397 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 398 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 399 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 400 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 401 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 402 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 403 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 404 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 405 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 406 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 407 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 408 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 409 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 410 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 411 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 412 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 413 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 414
 415 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 416 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 417 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 418
 419 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 420 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 421 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 422 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 423 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 424 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 425 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 426
 427 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 428
 429 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 430 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 431 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 432 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 433
 434 /* A node for `((void) 0)'.  */
 435 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 436
 437 /* The node for C++ `__null'.  */
 438 #define null_node                       c_global_trees[CTI_NULL]
 439
 440 extern GTY(()) tree c_global_trees[CTI_MAX];
 441
 442 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 443    tree for size reasons.  */
 444 struct GTY((variable_size)) sorted_fields_type {
 445   int len;
 446   tree GTY((length ("%h.len"))) elts[1];
 447 };
 448
 449 /* Mark which labels are explicitly declared.
 450    These may be shadowed, and may be referenced from nested functions.  */
 451 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 452
 453 typedef enum c_language_kind
 454 {
 455   clk_c         = 0,            /* C90, C94 or C99 */
 456   clk_objc      = 1,            /* clk_c with ObjC features.  */
 457   clk_cxx       = 2,            /* ANSI/ISO C++ */
 458   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 459 }
 460 c_language_kind;
 461
 462 /* To test for a specific language use c_language, defined by each
 463    front end.  For "ObjC features" or "not C++" use the macros.  */
 464 extern c_language_kind c_language;
 465
 466 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 467 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 468
 469 /* The various name of operator that appears in error messages. */
 470 typedef enum ref_operator {
 471   /* NULL */
 472   RO_NULL,
 473   /* array indexing */
 474   RO_ARRAY_INDEXING,
 475   /* unary * */
 476   RO_UNARY_STAR,
 477   /* -> */
 478   RO_ARROW,
 479   /* implicit conversion */
 480   RO_IMPLICIT_CONVERSION,
 481   /* ->* */
 482   RO_ARROW_STAR
 483 } ref_operator;
 484
 485 /* Information about a statement tree.  */
 486
 487 struct GTY(()) stmt_tree_s {
 488   /* A stack of statement lists being collected.  */
 489   vec<tree, va_gc> *x_cur_stmt_list;
 490
 491   /* In C++, Nonzero if we should treat statements as full
 492      expressions.  In particular, this variable is non-zero if at the
 493      end of a statement we should destroy any temporaries created
 494      during that statement.  Similarly, if, at the end of a block, we
 495      should destroy any local variables in this block.  Normally, this
 496      variable is nonzero, since those are the normal semantics of
 497      C++.
 498
 499      This flag has no effect in C.  */
 500   int stmts_are_full_exprs_p;
 501 };
 502
 503 typedef struct stmt_tree_s *stmt_tree;
 504
 505 /* Global state pertinent to the current function.  Some C dialects
 506    extend this structure with additional fields.  */
 507
 508 struct GTY(()) c_language_function {
 509   /* While we are parsing the function, this contains information
 510      about the statement-tree that we are building.  */
 511   struct stmt_tree_s x_stmt_tree;
 512
 513   /* Vector of locally defined typedefs, for
 514      -Wunused-local-typedefs.  */
 515   vec<tree, va_gc> *local_typedefs;
 516 };
 517
 518 #define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
 519
 520 /* When building a statement-tree, this is the current statement list
 521    being collected.  */
 522 #define cur_stmt_list   (stmt_list_stack->last ())
 523
 524 #define building_stmt_list_p() (stmt_list_stack && !stmt_list_stack->is_empty())
 525
 526 /* Language-specific hooks.  */
 527
 528 /* If non-NULL, this function is called after a precompile header file
 529    is loaded.  */
 530 extern void (*lang_post_pch_load) (void);
 531
 532 extern void push_file_scope (void);
 533 extern void pop_file_scope (void);
 534 extern stmt_tree current_stmt_tree (void);
 535 extern tree push_stmt_list (void);
 536 extern tree pop_stmt_list (tree);
 537 extern tree add_stmt (tree);
 538 extern void push_cleanup (tree, tree, bool);
 539 extern tree pushdecl_top_level (tree);
 540 extern tree pushdecl (tree);
 541 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 542                                location_t, tree, tree);
 543 extern tree build_indirect_ref (location_t, tree, ref_operator);
 544
 545 extern int field_decl_cmp (const void *, const void *);
 546 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 547                                   void *);
 548 extern bool has_c_linkage (const_tree decl);
 549 \f
 550 /* Switches common to the C front ends.  */
 551
 552 /* Nonzero means don't output line number information.  */
 553
 554 extern char flag_no_line_commands;
 555
 556 /* Nonzero causes -E output not to be done, but directives such as
 557    #define that have side effects are still obeyed.  */
 558
 559 extern char flag_no_output;
 560
 561 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 562    'N' or 'U' of the command line switch.  */
 563
 564 extern char flag_dump_macros;
 565
 566 /* Nonzero means pass #include lines through to the output.  */
 567
 568 extern char flag_dump_includes;
 569
 570 /* Nonzero means process PCH files while preprocessing.  */
 571
 572 extern bool flag_pch_preprocess;
 573
 574 /* The file name to which we should write a precompiled header, or
 575    NULL if no header will be written in this compile.  */
 576
 577 extern const char *pch_file;
 578
 579 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 580    user's namespace.  */
 581
 582 extern int flag_iso;
 583
 584 /* C/ObjC language option variables.  */
 585
 586
 587 /* Nonzero means allow type mismatches in conditional expressions;
 588    just make their values `void'.  */
 589
 590 extern int flag_cond_mismatch;
 591
 592 /* Nonzero means enable C89 Amendment 1 features.  */
 593
 594 extern int flag_isoc94;
 595
 596 /* Nonzero means use the ISO C99 (or C11) dialect of C.  */
 597
 598 extern int flag_isoc99;
 599
 600 /* Nonzero means use the ISO C11 dialect of C.  */
 601
 602 extern int flag_isoc11;
 603
 604 /* Nonzero means that we have builtin functions, and main is an int.  */
 605
 606 extern int flag_hosted;
 607
 608 /* ObjC language option variables.  */
 609
 610
 611 /* Tells the compiler that this is a special run.  Do not perform any
 612    compiling, instead we are to test some platform dependent features
 613    and output a C header file with appropriate definitions.  */
 614
 615 extern int print_struct_values;
 616
 617 /* Tells the compiler what is the constant string class for ObjC.  */
 618
 619 extern const char *constant_string_class_name;
 620
 621
 622 /* C++ language option variables.  */
 623
 624
 625 /* Nonzero means generate separate instantiation control files and
 626    juggle them at link time.  */
 627
 628 extern int flag_use_repository;
 629
 630 /* The supported C++ dialects.  */
 631
 632 enum cxx_dialect {
 633   /* C++98 with TC1  */
 634   cxx98,
 635   cxx03 = cxx98,
 636   /* C++11  */
 637   cxx0x,
 638   cxx11 = cxx0x,
 639   /* C++1y (C++17?) */
 640   cxx1y
 641 };
 642
 643 /* The C++ dialect being used. C++98 is the default.  */
 644 extern enum cxx_dialect cxx_dialect;
 645
 646 /* Maximum template instantiation depth.  This limit is rather
 647    arbitrary, but it exists to limit the time it takes to notice
 648    excessively recursive template instantiations.  */
 649
 650 extern int max_tinst_depth;
 651
 652 /* Nonzero means that we should not issue warnings about problems that
 653    occur when the code is executed, because the code being processed
 654    is not expected to be executed.  This is set during parsing.  This
 655    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 656    not a bool, because unexecuted expressions can nest.  */
 657
 658 extern int c_inhibit_evaluation_warnings;
 659
 660 /* Whether lexing has been completed, so subsequent preprocessor
 661    errors should use the compiler's input_location.  */
 662
 663 extern bool done_lexing;
 664
 665 /* C types are partitioned into three subsets: object, function, and
 666    incomplete types.  */
 667 #define C_TYPE_OBJECT_P(type) \
 668   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 669
 670 #define C_TYPE_INCOMPLETE_P(type) \
 671   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 672
 673 #define C_TYPE_FUNCTION_P(type) \
 674   (TREE_CODE (type) == FUNCTION_TYPE)
 675
 676 /* For convenience we define a single macro to identify the class of
 677    object or incomplete types.  */
 678 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 679   (!C_TYPE_FUNCTION_P (type))
 680
 681 struct visibility_flags
 682 {
 683   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 684   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 685 };
 686
 687 /* Global visibility options.  */
 688 extern struct visibility_flags visibility_options;
 689
 690 /* Attribute table common to the C front ends.  */
 691 extern const struct attribute_spec c_common_attribute_table[];
 692 extern const struct attribute_spec c_common_format_attribute_table[];
 693
 694 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 695    ID is the identifier to use, NAME is the string.
 696    TYPE_DEP indicates whether it depends on type of the function or not
 697    (i.e. __PRETTY_FUNCTION__).  */
 698
 699 extern tree (*make_fname_decl) (location_t, tree, int);
 700
 701 /* In c-decl.c and cp/tree.c.  FIXME.  */
 702 extern void c_register_addr_space (const char *str, addr_space_t as);
 703
 704 /* In c-common.c.  */
 705 extern bool in_late_binary_op;
 706 extern const char *c_addr_space_name (addr_space_t as);
 707 extern tree identifier_global_value (tree);
 708 extern tree c_linkage_bindings (tree);
 709 extern void record_builtin_type (enum rid, const char *, tree);
 710 extern tree build_void_list_node (void);
 711 extern void start_fname_decls (void);
 712 extern void finish_fname_decls (void);
 713 extern const char *fname_as_string (int);
 714 extern tree fname_decl (location_t, unsigned, tree);
 715
 716 extern int check_user_alignment (const_tree, bool);
 717 extern void check_function_arguments (const_tree, int, tree *);
 718 extern void check_function_arguments_recurse (void (*)
 719                                               (void *, tree,
 720                                                unsigned HOST_WIDE_INT),
 721                                               void *, tree,
 722                                               unsigned HOST_WIDE_INT);
 723 extern bool check_builtin_function_arguments (tree, int, tree *);
 724 extern void check_function_format (tree, int, tree *);
 725 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 726 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 727 extern bool attribute_takes_identifier_p (const_tree);
 728 extern bool c_common_handle_option (size_t, const char *, int, int, location_t,
 729                                     const struct cl_option_handlers *);
 730 extern bool default_handle_c_option (size_t, const char *, int);
 731 extern tree c_common_type_for_mode (enum machine_mode, int);
 732 extern tree c_common_type_for_size (unsigned int, int);
 733 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 734                                                 int, int);
 735 extern tree c_common_unsigned_type (tree);
 736 extern tree c_common_signed_type (tree);
 737 extern tree c_common_signed_or_unsigned_type (int, tree);
 738 extern void c_common_init_ts (void);
 739 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 740 extern bool unsafe_conversion_p (tree, tree, bool);
 741 extern bool decl_with_nonnull_addr_p (const_tree);
 742 extern tree c_fully_fold (tree, bool, bool *);
 743 extern tree decl_constant_value_for_optimization (tree);
 744 extern tree c_wrap_maybe_const (tree, bool);
 745 extern tree c_save_expr (tree);
 746 extern tree c_common_truthvalue_conversion (location_t, tree);
 747 extern void c_apply_type_quals_to_decl (int, tree);
 748 extern tree c_sizeof_or_alignof_type (location_t, tree, bool, int);
 749 extern tree c_alignof_expr (location_t, tree);
 750 /* Print an error message for invalid operands to arith operation CODE.
 751    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 752 extern void binary_op_error (location_t, enum tree_code, tree, tree);
 753 extern tree fix_string_type (tree);
 754 extern void constant_expression_warning (tree);
 755 extern void constant_expression_error (tree);
 756 extern bool strict_aliasing_warning (tree, tree, tree);
 757 extern void sizeof_pointer_memaccess_warning (location_t *, tree,
 758                                               vec<tree, va_gc> *, tree *,
 759                                               bool (*) (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 bool warn_if_unused_value (const_tree, location_t);
 764 extern void warn_logical_operator (location_t, enum tree_code, tree,
 765                                    enum tree_code, tree, enum tree_code, tree);
 766 extern void check_main_parameter_types (tree decl);
 767 extern bool c_determine_visibility (tree);
 768 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 769 extern void mark_valid_location_for_stdc_pragma (bool);
 770 extern bool valid_location_for_stdc_pragma_p (void);
 771 extern void set_float_const_decimal64 (void);
 772 extern void clear_float_const_decimal64 (void);
 773 extern bool float_const_decimal64_p (void);
 774
 775 extern bool keyword_begins_type_specifier (enum rid);
 776 extern bool keyword_is_storage_class_specifier (enum rid);
 777 extern bool keyword_is_type_qualifier (enum rid);
 778 extern bool keyword_is_decl_specifier (enum rid);
 779 extern bool cxx_fundamental_alignment_p (unsigned);
 780
 781 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, 1)
 782 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, 1)
 783
 784 /* Subroutine of build_binary_op, used for certain operations.  */
 785 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 786
 787 /* Subroutine of build_binary_op, used for comparison operations.
 788    See if the operands have both been converted from subword integer types
 789    and, if so, perhaps change them both back to their original type.  */
 790 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 791
 792 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree);
 793
 794 /* Add qualifiers to a type, in the fashion for C.  */
 795 extern tree c_build_qualified_type (tree, int);
 796
 797 /* Build tree nodes and builtin functions common to both C and C++ language
 798    frontends.  */
 799 extern void c_common_nodes_and_builtins (void);
 800
 801 extern void disable_builtin_function (const char *);
 802
 803 extern void set_compound_literal_name (tree decl);
 804
 805 extern tree build_va_arg (location_t, tree, tree);
 806
 807 extern const unsigned int c_family_lang_mask;
 808 extern unsigned int c_common_option_lang_mask (void);
 809 extern void c_common_initialize_diagnostics (diagnostic_context *);
 810 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 811 extern void c_common_init_options_struct (struct gcc_options *);
 812 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 813 extern bool c_common_post_options (const char **);
 814 extern bool c_common_init (void);
 815 extern void c_common_finish (void);
 816 extern void c_common_parse_file (void);
 817 extern alias_set_type c_common_get_alias_set (tree);
 818 extern void c_register_builtin_type (tree, const char*);
 819 extern bool c_promoting_integer_type_p (const_tree);
 820 extern int self_promoting_args_p (const_tree);
 821 extern tree strip_pointer_operator (tree);
 822 extern tree strip_pointer_or_array_types (tree);
 823 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 824
 825 /* This is the basic parsing function.  */
 826 extern void c_parse_file (void);
 827
 828 extern void warn_for_omitted_condop (location_t, tree);
 829
 830 /* These macros provide convenient access to the various _STMT nodes.  */
 831
 832 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 833    if a statement expression.  */
 834 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 835   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 836
 837 /* Nonzero if a label has been added to the statement list.  */
 838 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 839   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 840
 841 /* C_MAYBE_CONST_EXPR accessors.  */
 842 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
 843   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
 844 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
 845   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
 846 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
 847   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 848 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
 849   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 850 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
 851   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
 852    && (TREE_CODE (EXPR) == INTEGER_CST                  \
 853        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
 854            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
 855
 856 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 857 #define DECL_C_BIT_FIELD(NODE) \
 858   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 859 #define SET_DECL_C_BIT_FIELD(NODE) \
 860   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 861 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 862   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 863
 864 extern tree do_case (location_t, tree, tree);
 865 extern tree build_stmt (location_t, enum tree_code, ...);
 866 extern tree build_real_imag_expr (location_t, enum tree_code, tree);
 867
 868 /* These functions must be defined by each front-end which implements
 869    a variant of the C language.  They are used in c-common.c.  */
 870
 871 extern tree build_unary_op (location_t, enum tree_code, tree, int);
 872 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
 873 extern tree perform_integral_promotions (tree);
 874
 875 /* These functions must be defined by each front-end which implements
 876    a variant of the C language.  They are used by port files.  */
 877
 878 extern tree default_conversion (tree);
 879
 880 /* Given two integer or real types, return the type for their sum.
 881    Given two compatible ANSI C types, returns the merged type.  */
 882
 883 extern tree common_type (tree, tree);
 884
 885 extern tree decl_constant_value (tree);
 886
 887 /* Handle increment and decrement of boolean types.  */
 888 extern tree boolean_increment (enum tree_code, tree);
 889
 890 extern int case_compare (splay_tree_key, splay_tree_key);
 891
 892 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree, tree);
 893
 894 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 895
 896 extern tree build_function_call (location_t, tree, tree);
 897
 898 extern tree build_function_call_vec (location_t, tree, vec<tree, va_gc> *,
 899                                      vec<tree, va_gc> *);
 900
 901 extern tree resolve_overloaded_builtin (location_t, tree, vec<tree, va_gc> *);
 902
 903 extern tree finish_label_address_expr (tree, location_t);
 904
 905 /* Same function prototype, but the C and C++ front ends have
 906    different implementations.  Used in c-common.c.  */
 907 extern tree lookup_label (tree);
 908 extern tree lookup_name (tree);
 909 extern bool lvalue_p (const_tree);
 910
 911 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
 912 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 913 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree);
 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_1 (tree);
 955 extern tree fold_offsetof (tree);
 956
 957 /* Places where an lvalue, or modifiable lvalue, may be required.
 958    Used to select diagnostic messages in lvalue_error and
 959    readonly_error.  */
 960 enum lvalue_use {
 961   lv_assign,
 962   lv_increment,
 963   lv_decrement,
 964   lv_addressof,
 965   lv_asm
 966 };
 967
 968 extern void readonly_error (tree, enum lvalue_use);
 969 extern void lvalue_error (location_t, enum lvalue_use);
 970 extern void invalid_indirection_error (location_t, tree, ref_operator);
 971
 972 extern int complete_array_type (tree *, tree, bool);
 973
 974 extern tree builtin_type_for_size (int, bool);
 975
 976 extern void c_common_mark_addressable_vec (tree);
 977
 978 extern void warn_array_subscript_with_type_char (tree);
 979 extern void warn_about_parentheses (location_t,
 980                                     enum tree_code,
 981                                     enum tree_code, tree,
 982                                     enum tree_code, tree);
 983 extern void warn_for_unused_label (tree label);
 984 extern void warn_for_div_by_zero (location_t, tree divisor);
 985 extern void warn_for_sign_compare (location_t,
 986                                    tree orig_op0, tree orig_op1,
 987                                    tree op0, tree op1,
 988                                    tree result_type,
 989                                    enum tree_code resultcode);
 990 extern void do_warn_double_promotion (tree, tree, tree, const char *,
 991                                       location_t);
 992 extern void set_underlying_type (tree);
 993 extern void record_locally_defined_typedef (tree);
 994 extern void maybe_record_typedef_use (tree);
 995 extern void maybe_warn_unused_local_typedefs (void);
 996 extern vec<tree, va_gc> *make_tree_vector (void);
 997 extern void release_tree_vector (vec<tree, va_gc> *);
 998 extern vec<tree, va_gc> *make_tree_vector_single (tree);
 999 extern vec<tree, va_gc> *make_tree_vector_from_list (tree);
1000 extern vec<tree, va_gc> *make_tree_vector_copy (const vec<tree, va_gc> *);
1001
1002 /* In c-gimplify.c  */
1003 extern void c_genericize (tree);
1004 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1005 extern tree c_build_bind_expr (location_t, tree, tree);
1006
1007 /* In c-pch.c  */
1008 extern void pch_init (void);
1009 extern void pch_cpp_save_state (void);
1010 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1011 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1012                                const char *orig);
1013 extern void c_common_write_pch (void);
1014 extern void c_common_no_more_pch (void);
1015 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1016
1017 /* In *-checksum.c */
1018 extern const unsigned char executable_checksum[16];
1019
1020 /* In c-cppbuiltin.c  */
1021 extern void builtin_define_std (const char *macro);
1022 extern void builtin_define_with_value (const char *, const char *, int);
1023 extern void c_stddef_cpp_builtins (void);
1024 extern void fe_file_change (const struct line_map *);
1025 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char);
1026
1027 /* In c-ppoutput.c  */
1028 extern void init_pp_output (FILE *);
1029 extern void preprocess_file (cpp_reader *);
1030 extern void pp_file_change (const struct line_map *);
1031 extern void pp_dir_change (cpp_reader *, const char *);
1032 extern bool check_missing_format_attribute (tree, tree);
1033
1034 /* In c-omp.c  */
1035 extern tree c_finish_omp_master (location_t, tree);
1036 extern tree c_finish_omp_critical (location_t, tree, tree);
1037 extern tree c_finish_omp_ordered (location_t, tree);
1038 extern void c_finish_omp_barrier (location_t);
1039 extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
1040                                  tree, tree, tree, tree, tree);
1041 extern void c_finish_omp_flush (location_t);
1042 extern void c_finish_omp_taskwait (location_t);
1043 extern void c_finish_omp_taskyield (location_t);
1044 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1045 extern void c_split_parallel_clauses (location_t, tree, tree *, tree *);
1046 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1047
1048 /* Not in c-omp.c; provided by the front end.  */
1049 extern bool c_omp_sharing_predetermined (tree);
1050 extern tree c_omp_remap_decl (tree, bool);
1051 extern void record_types_used_by_current_var_decl (tree);
1052
1053 /* Return next tree in the chain for chain_next walking of tree nodes.  */
1054 static inline tree
1055 c_tree_chain_next (tree t)
1056 {
1057   /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1058      kind of object, never a long chain of nodes.  Prefer
1059      TYPE_NEXT_VARIANT for types.  */
1060   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1061     return TYPE_NEXT_VARIANT (t);
1062   /* Otherwise, if there is TREE_CHAIN, return it.  */
1063   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1064     return TREE_CHAIN (t);
1065   return NULL;
1066 }
1067
1068 /* Mask used by tm_stmt_attr.  */
1069 #define TM_STMT_ATTR_OUTER      2
1070 #define TM_STMT_ATTR_ATOMIC     4
1071 #define TM_STMT_ATTR_RELAXED    8
1072
1073 extern int parse_tm_stmt_attr (tree, int);
1074
1075 /* Mask used by tm_attr_to_mask and tm_mask_to_attr.  Note that these
1076    are ordered specifically such that more restrictive attributes are
1077    at lower bit positions.  This fact is known by the C++ tm attribute
1078    inheritance code such that least bit extraction (mask & -mask) results
1079    in the most restrictive attribute.  */
1080 #define TM_ATTR_SAFE                    1
1081 #define TM_ATTR_CALLABLE                2
1082 #define TM_ATTR_PURE                    4
1083 #define TM_ATTR_IRREVOCABLE             8
1084 #define TM_ATTR_MAY_CANCEL_OUTER        16
1085
1086 extern int tm_attr_to_mask (tree);
1087 extern tree tm_mask_to_attr (int);
1088 extern tree find_tm_attribute (tree);
1089
1090 /* A suffix-identifier value doublet that represents user-defined literals
1091    for C++-0x.  */
1092 struct GTY(()) tree_userdef_literal {
1093   struct tree_base base;
1094   tree suffix_id;
1095   tree value;
1096   tree num_string;
1097 };
1098
1099 #define USERDEF_LITERAL_SUFFIX_ID(NODE) \
1100   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->suffix_id)
1101
1102 #define USERDEF_LITERAL_VALUE(NODE) \
1103   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->value)
1104
1105 #define USERDEF_LITERAL_NUM_STRING(NODE) \
1106   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->num_string)
1107
1108 #define USERDEF_LITERAL_TYPE(NODE) \
1109   (TREE_TYPE (USERDEF_LITERAL_VALUE (NODE)))
1110
1111 extern tree build_userdef_literal (tree suffix_id, tree value, tree num_string);
1112
1113 extern void convert_vector_to_pointer_for_subscript (location_t, tree*, tree);
1114
1115 /* Possibe cases of scalar_to_vector conversion.  */
1116 enum stv_conv {
1117   stv_error,        /* Error occured.  */
1118   stv_nothing,      /* Nothing happened.  */
1119   stv_firstarg,     /* First argument must be expanded.  */
1120   stv_secondarg     /* Second argument must be expanded.  */
1121 };
1122
1123 extern enum stv_conv scalar_to_vector (location_t loc, enum tree_code code,
1124                                        tree op0, tree op1, bool);
1125
1126 #endif /* ! GCC_C_COMMON_H */