gcc/c-family/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987-2017 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_C_COMMON_H
  21 #define GCC_C_COMMON_H
  22
  23 #include "splay-tree.h"
  24 #include "cpplib.h"
  25 #include "alias.h"
  26 #include "tree.h"
  27 #include "fold-const.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: IDENTIFIER_MARKED (used by search routines).
  47       C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)
  48    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  49       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  50       C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)
  51    2: unused
  52    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  53    4: unused
  54 */
  55
  56 /* Reserved identifiers.  This is the union of all the keywords for C,
  57    C++, and Objective-C.  All the type modifiers have to be in one
  58    block at the beginning, because they are used as mask bits.  There
  59    are 28 type modifiers; if we add many more we will have to redesign
  60    the mask mechanism.  */
  61
  62 enum rid
  63 {
  64   /* Modifiers: */
  65   /* C, in empirical order of frequency.  */
  66   RID_STATIC = 0,
  67   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  68   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  69   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  70   RID_NORETURN, RID_ATOMIC,
  71
  72   /* C extensions */
  73   RID_COMPLEX, RID_THREAD, RID_SAT,
  74
  75   /* C++ */
  76   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  77
  78   /* ObjC ("PQ" reserved words - they do not appear after a '@' and
  79      are keywords only in specific contexts)  */
  80   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  81
  82   /* ObjC ("PATTR" reserved words - they do not appear after a '@'
  83      and are keywords only as property attributes)  */
  84   RID_GETTER, RID_SETTER,
  85   RID_READONLY, RID_READWRITE,
  86   RID_ASSIGN, RID_RETAIN, RID_COPY,
  87   RID_NONATOMIC,
  88
  89   /* C (reserved and imaginary types not implemented, so any use is a
  90      syntax error) */
  91   RID_IMAGINARY,
  92
  93   /* C */
  94   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  95   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  96   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  97   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  98   RID_SIZEOF,
  99
 100   /* C extensions */
 101   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
 102   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
 103   RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,          RID_BUILTIN_SHUFFLE,
 104   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
 105
 106   /* TS 18661-3 keywords, in the same sequence as the TI_* values.  */
 107   RID_FLOAT16,
 108   RID_FLOATN_NX_FIRST = RID_FLOAT16,
 109   RID_FLOAT32,
 110   RID_FLOAT64,
 111   RID_FLOAT128,
 112   RID_FLOAT32X,
 113   RID_FLOAT64X,
 114   RID_FLOAT128X,
 115 #define CASE_RID_FLOATN_NX                                              \
 116   case RID_FLOAT16: case RID_FLOAT32: case RID_FLOAT64: case RID_FLOAT128: \
 117   case RID_FLOAT32X: case RID_FLOAT64X: case RID_FLOAT128X
 118
 119   RID_FRACT, RID_ACCUM, RID_AUTO_TYPE, RID_BUILTIN_CALL_WITH_STATIC_CHAIN,
 120
 121   /* "__GIMPLE", for the GIMPLE-parsing extension to the C frontend. */
 122   RID_GIMPLE,
 123
 124   /* "__PHI", for parsing PHI function in GIMPLE FE.  */
 125   RID_PHI,
 126
 127   /* "__RTL", for the RTL-parsing extension to the C frontend.  */
 128   RID_RTL,
 129
 130   /* C11 */
 131   RID_ALIGNAS, RID_GENERIC,
 132
 133   /* This means to warn that this is a C++ keyword, and then treat it
 134      as a normal identifier.  */
 135   RID_CXX_COMPAT_WARN,
 136
 137   /* GNU transactional memory extension */
 138   RID_TRANSACTION_ATOMIC, RID_TRANSACTION_RELAXED, RID_TRANSACTION_CANCEL,
 139
 140   /* Too many ways of getting the name of a function as a string */
 141   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
 142
 143   /* C++ (some of these are keywords in Objective-C as well, but only
 144      if they appear after a '@') */
 145   RID_BOOL,     RID_WCHAR,    RID_CLASS,
 146   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
 147   RID_TEMPLATE, RID_NULL,     RID_CATCH,
 148   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
 149   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
 150   RID_THIS,     RID_THROW,    RID_TRUE,
 151   RID_TRY,      RID_TYPENAME, RID_TYPEID,
 152   RID_USING,    RID_CHAR16,   RID_CHAR32,
 153
 154   /* casts */
 155   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
 156
 157   /* C++ extensions */
 158   RID_ADDRESSOF,               RID_BASES,
 159   RID_BUILTIN_LAUNDER,         RID_DIRECT_BASES,
 160   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
 161   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
 162   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
 163   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_UNIQUE_OBJ_REPRESENTATIONS,
 164   RID_HAS_VIRTUAL_DESTRUCTOR,
 165   RID_IS_ABSTRACT,             RID_IS_AGGREGATE,
 166   RID_IS_BASE_OF,              RID_IS_CLASS,
 167   RID_IS_EMPTY,                RID_IS_ENUM,
 168   RID_IS_FINAL,                RID_IS_LITERAL_TYPE,
 169   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 170   RID_IS_SAME_AS,
 171   RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,
 172   RID_IS_TRIVIALLY_ASSIGNABLE, RID_IS_TRIVIALLY_CONSTRUCTIBLE,
 173   RID_IS_TRIVIALLY_COPYABLE,
 174   RID_IS_UNION,                RID_UNDERLYING_TYPE,
 175   RID_IS_ASSIGNABLE,           RID_IS_CONSTRUCTIBLE,
 176
 177   /* C++11 */
 178   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 179
 180   /* C++ concepts */
 181   RID_CONCEPT, RID_REQUIRES,
 182
 183   /* C++ transactional memory.  */
 184   RID_ATOMIC_NOEXCEPT, RID_ATOMIC_CANCEL, RID_SYNCHRONIZED,
 185
 186   /* Cilk Plus keywords.  */
 187   RID_CILK_SPAWN, RID_CILK_SYNC, RID_CILK_FOR,
 188
 189   /* Objective-C ("AT" reserved words - they are only keywords when
 190      they follow '@')  */
 191   RID_AT_ENCODE,   RID_AT_END,
 192   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 193   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 194   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 195   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 196   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 197   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 198   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 199   RID_AT_INTERFACE,
 200   RID_AT_IMPLEMENTATION,
 201
 202   /* Named address support, mapping the keyword to a particular named address
 203      number.  Named address space 0 is reserved for the generic address.  If
 204      there are more than 254 named addresses, the addr_space_t type will need
 205      to be grown from an unsigned char to unsigned short.  */
 206   RID_ADDR_SPACE_0,             /* generic address */
 207   RID_ADDR_SPACE_1,
 208   RID_ADDR_SPACE_2,
 209   RID_ADDR_SPACE_3,
 210   RID_ADDR_SPACE_4,
 211   RID_ADDR_SPACE_5,
 212   RID_ADDR_SPACE_6,
 213   RID_ADDR_SPACE_7,
 214   RID_ADDR_SPACE_8,
 215   RID_ADDR_SPACE_9,
 216   RID_ADDR_SPACE_10,
 217   RID_ADDR_SPACE_11,
 218   RID_ADDR_SPACE_12,
 219   RID_ADDR_SPACE_13,
 220   RID_ADDR_SPACE_14,
 221   RID_ADDR_SPACE_15,
 222
 223   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 224   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 225
 226   /* __intN keywords.  The _N_M here doesn't correspond to the intN
 227      in the keyword; use the bitsize in int_n_t_data_t[M] for that.
 228      For example, if int_n_t_data_t[0].bitsize is 13, then RID_INT_N_0
 229      is for __int13.  */
 230
 231   /* Note that the range to use is RID_FIRST_INT_N through
 232      RID_FIRST_INT_N + NUM_INT_N_ENTS - 1 and c-parser.c has a list of
 233      all RID_INT_N_* in a case statement.  */
 234
 235   RID_INT_N_0,
 236   RID_INT_N_1,
 237   RID_INT_N_2,
 238   RID_INT_N_3,
 239
 240   RID_FIRST_INT_N = RID_INT_N_0,
 241   RID_LAST_INT_N = RID_INT_N_3,
 242
 243   RID_MAX,
 244
 245   RID_FIRST_MODIFIER = RID_STATIC,
 246   RID_LAST_MODIFIER = RID_ONEWAY,
 247
 248   RID_FIRST_CXX11 = RID_CONSTEXPR,
 249   RID_LAST_CXX11 = RID_STATIC_ASSERT,
 250   RID_FIRST_AT = RID_AT_ENCODE,
 251   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 252   RID_FIRST_PQ = RID_IN,
 253   RID_LAST_PQ = RID_ONEWAY,
 254   RID_FIRST_PATTR = RID_GETTER,
 255   RID_LAST_PATTR = RID_NONATOMIC
 256 };
 257
 258 #define OBJC_IS_AT_KEYWORD(rid) \
 259   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 260    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 261
 262 #define OBJC_IS_PQ_KEYWORD(rid) \
 263   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 264    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 265
 266 #define OBJC_IS_PATTR_KEYWORD(rid) \
 267   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 268    (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)
 269
 270 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 271    'class') which are shared in a subtle way between Objective-C and
 272    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 273    finds '@' followed by one of these identifiers (eg, '@class'), it
 274    recognizes the whole as an Objective-C keyword.  If the identifier
 275    is found elsewhere, it follows the rules of the C/C++ language.
 276  */
 277 #define OBJC_IS_CXX_KEYWORD(rid) \
 278   (rid == RID_CLASS || rid == RID_SYNCHRONIZED                  \
 279    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 280    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 281
 282 /* The elements of `ridpointers' are identifier nodes for the reserved
 283    type names and storage classes.  It is indexed by a RID_... value.  */
 284 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 285
 286 /* Standard named or nameless data types of the C compiler.  */
 287
 288 enum c_tree_index
 289 {
 290     CTI_CHAR16_TYPE,
 291     CTI_CHAR32_TYPE,
 292     CTI_WCHAR_TYPE,
 293     CTI_UNDERLYING_WCHAR_TYPE,
 294     CTI_WINT_TYPE,
 295     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 296     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 297     CTI_INTMAX_TYPE,
 298     CTI_UINTMAX_TYPE,
 299     CTI_WIDEST_INT_LIT_TYPE,
 300     CTI_WIDEST_UINT_LIT_TYPE,
 301
 302     /* Types for <stdint.h>, that may not be defined on all
 303        targets.  */
 304     CTI_SIG_ATOMIC_TYPE,
 305     CTI_INT8_TYPE,
 306     CTI_INT16_TYPE,
 307     CTI_INT32_TYPE,
 308     CTI_INT64_TYPE,
 309     CTI_UINT8_TYPE,
 310     CTI_UINT16_TYPE,
 311     CTI_UINT32_TYPE,
 312     CTI_UINT64_TYPE,
 313     CTI_INT_LEAST8_TYPE,
 314     CTI_INT_LEAST16_TYPE,
 315     CTI_INT_LEAST32_TYPE,
 316     CTI_INT_LEAST64_TYPE,
 317     CTI_UINT_LEAST8_TYPE,
 318     CTI_UINT_LEAST16_TYPE,
 319     CTI_UINT_LEAST32_TYPE,
 320     CTI_UINT_LEAST64_TYPE,
 321     CTI_INT_FAST8_TYPE,
 322     CTI_INT_FAST16_TYPE,
 323     CTI_INT_FAST32_TYPE,
 324     CTI_INT_FAST64_TYPE,
 325     CTI_UINT_FAST8_TYPE,
 326     CTI_UINT_FAST16_TYPE,
 327     CTI_UINT_FAST32_TYPE,
 328     CTI_UINT_FAST64_TYPE,
 329     CTI_INTPTR_TYPE,
 330     CTI_UINTPTR_TYPE,
 331
 332     CTI_CHAR_ARRAY_TYPE,
 333     CTI_CHAR16_ARRAY_TYPE,
 334     CTI_CHAR32_ARRAY_TYPE,
 335     CTI_WCHAR_ARRAY_TYPE,
 336     CTI_STRING_TYPE,
 337     CTI_CONST_STRING_TYPE,
 338
 339     /* Type for boolean expressions (bool in C++, int in C).  */
 340     CTI_TRUTHVALUE_TYPE,
 341     CTI_TRUTHVALUE_TRUE,
 342     CTI_TRUTHVALUE_FALSE,
 343
 344     CTI_DEFAULT_FUNCTION_TYPE,
 345
 346     /* These are not types, but we have to look them up all the time.  */
 347     CTI_FUNCTION_NAME_DECL,
 348     CTI_PRETTY_FUNCTION_NAME_DECL,
 349     CTI_C99_FUNCTION_NAME_DECL,
 350     CTI_SAVED_FUNCTION_NAME_DECLS,
 351
 352     CTI_NULL,
 353
 354     CTI_MAX
 355 };
 356
 357 #define C_CPP_HASHNODE(id) \
 358   (&(((struct c_common_identifier *) (id))->node))
 359 #define C_RID_CODE(id) \
 360   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 361 #define C_SET_RID_CODE(id, code) \
 362   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 363
 364 /* Identifier part common to the C front ends.  Inherits from
 365    tree_identifier, despite appearances.  */
 366 struct GTY(()) c_common_identifier {
 367   struct tree_common common;
 368   struct cpp_hashnode node;
 369 };
 370
 371 /* An entry in the reserved keyword table.  */
 372
 373 struct c_common_resword
 374 {
 375   const char *const word;
 376   ENUM_BITFIELD(rid) const rid : 16;
 377   const unsigned int disable   : 16;
 378 };
 379
 380 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 381
 382 extern machine_mode c_default_pointer_mode;
 383
 384 /* Extra cpp_ttype values for C++.  */
 385
 386 /* A token type for template-ids.  If a template-id is processed while
 387    parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
 388    the value of the CPP_TEMPLATE_ID is whatever was returned by
 389    cp_parser_template_id.  */
 390 #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
 391
 392 /* A token type for nested-name-specifiers.  If a
 393    nested-name-specifier is processed while parsing tentatively, it is
 394    replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
 395    CPP_NESTED_NAME_SPECIFIER is whatever was returned by
 396    cp_parser_nested_name_specifier_opt.  */
 397 #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
 398
 399 /* A token type for pre-parsed C++0x decltype.  */
 400 #define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
 401
 402 /* A token type for pre-parsed primary-expression (lambda- or statement-).  */
 403 #define CPP_PREPARSED_EXPR ((enum cpp_ttype) (CPP_DECLTYPE + 1))
 404
 405 /* The number of token types, including C++-specific ones.  */
 406 #define N_CP_TTYPES ((int) (CPP_PREPARSED_EXPR + 1))
 407
 408 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 409    mask) is _true_.  Thus for keywords which are present in all
 410    languages the disable field is zero.  */
 411
 412 #define D_CONLY         0x001   /* C only (not in C++).  */
 413 #define D_CXXONLY       0x002   /* C++ only (not in C).  */
 414 #define D_C99           0x004   /* In C, C99 only.  */
 415 #define D_CXX11         0x008   /* In C++, C++11 only.  */
 416 #define D_EXT           0x010   /* GCC extension.  */
 417 #define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
 418 #define D_ASM           0x040   /* Disabled by -fno-asm.  */
 419 #define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
 420 #define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
 421 #define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
 422 #define D_CXX_CONCEPTS  0x400   /* In C++, only with concepts. */
 423 #define D_TRANSMEM      0X800   /* C++ transactional memory TS.  */
 424
 425 #define D_CXX_CONCEPTS_FLAGS D_CXXONLY | D_CXX_CONCEPTS
 426
 427 /* The reserved keyword table.  */
 428 extern const struct c_common_resword c_common_reswords[];
 429
 430 /* The number of items in the reserved keyword table.  */
 431 extern const unsigned int num_c_common_reswords;
 432
 433 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 434 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 435 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 436 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 437 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 438 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 439 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 440 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 441 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 442 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 443 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 444
 445 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 446 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 447 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 448 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 449 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 450 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 451 #define c_uint16_type_node              c_global_trees[CTI_UINT16_TYPE]
 452 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 453 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 454 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 455 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 456 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 457 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 458 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 459 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 460 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 461 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 462 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 463 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 464 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 465 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 466 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 467 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 468 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 469 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 470 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 471 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 472
 473 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 474 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 475 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 476
 477 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 478 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 479 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 480 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 481 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 482 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 483
 484 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 485
 486 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 487 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 488 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 489 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 490
 491 /* The node for C++ `__null'.  */
 492 #define null_node                       c_global_trees[CTI_NULL]
 493
 494 extern GTY(()) tree c_global_trees[CTI_MAX];
 495
 496 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 497    tree for size reasons.  */
 498 struct GTY(()) sorted_fields_type {
 499   int len;
 500   tree GTY((length ("%h.len"))) elts[1];
 501 };
 502
 503 /* Mark which labels are explicitly declared.
 504    These may be shadowed, and may be referenced from nested functions.  */
 505 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 506
 507 enum c_language_kind
 508 {
 509   clk_c         = 0,            /* C90, C94, C99 or C11 */
 510   clk_objc      = 1,            /* clk_c with ObjC features.  */
 511   clk_cxx       = 2,            /* ANSI/ISO C++ */
 512   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 513 };
 514
 515 /* To test for a specific language use c_language, defined by each
 516    front end.  For "ObjC features" or "not C++" use the macros.  */
 517 extern c_language_kind c_language;
 518
 519 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 520 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 521
 522 /* The various name of operator that appears in error messages. */
 523 enum ref_operator {
 524   /* NULL */
 525   RO_NULL,
 526   /* array indexing */
 527   RO_ARRAY_INDEXING,
 528   /* unary * */
 529   RO_UNARY_STAR,
 530   /* -> */
 531   RO_ARROW,
 532   /* implicit conversion */
 533   RO_IMPLICIT_CONVERSION,
 534   /* ->* */
 535   RO_ARROW_STAR
 536 };
 537
 538 /* Information about a statement tree.  */
 539
 540 struct GTY(()) stmt_tree_s {
 541   /* A stack of statement lists being collected.  */
 542   vec<tree, va_gc> *x_cur_stmt_list;
 543
 544   /* In C++, Nonzero if we should treat statements as full
 545      expressions.  In particular, this variable is non-zero if at the
 546      end of a statement we should destroy any temporaries created
 547      during that statement.  Similarly, if, at the end of a block, we
 548      should destroy any local variables in this block.  Normally, this
 549      variable is nonzero, since those are the normal semantics of
 550      C++.
 551
 552      This flag has no effect in C.  */
 553   int stmts_are_full_exprs_p;
 554 };
 555
 556 typedef struct stmt_tree_s *stmt_tree;
 557
 558 /* Global state pertinent to the current function.  Some C dialects
 559    extend this structure with additional fields.  */
 560
 561 struct GTY(()) c_language_function {
 562   /* While we are parsing the function, this contains information
 563      about the statement-tree that we are building.  */
 564   struct stmt_tree_s x_stmt_tree;
 565
 566   /* Vector of locally defined typedefs, for
 567      -Wunused-local-typedefs.  */
 568   vec<tree, va_gc> *local_typedefs;
 569 };
 570
 571 #define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
 572
 573 /* When building a statement-tree, this is the current statement list
 574    being collected.  */
 575 #define cur_stmt_list   (stmt_list_stack->last ())
 576
 577 #define building_stmt_list_p() (stmt_list_stack && !stmt_list_stack->is_empty())
 578
 579 /* Language-specific hooks.  */
 580
 581 /* If non-NULL, this function is called after a precompile header file
 582    is loaded.  */
 583 extern void (*lang_post_pch_load) (void);
 584
 585 extern void push_file_scope (void);
 586 extern void pop_file_scope (void);
 587 extern stmt_tree current_stmt_tree (void);
 588 extern tree push_stmt_list (void);
 589 extern tree pop_stmt_list (tree);
 590 extern tree add_stmt (tree);
 591 extern void push_cleanup (tree, tree, bool);
 592
 593 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 594                                location_t, tree, tree);
 595 extern tree build_array_notation_expr (location_t, tree, tree, enum tree_code,
 596                                        location_t, tree, tree);
 597 extern tree build_array_notation_ref (location_t, tree, tree, tree, tree, tree);
 598 extern tree build_indirect_ref (location_t, tree, ref_operator);
 599
 600 extern int field_decl_cmp (const void *, const void *);
 601 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 602                                   void *);
 603 extern bool has_c_linkage (const_tree decl);
 604 extern bool c_decl_implicit (const_tree);
 605 \f
 606 /* Switches common to the C front ends.  */
 607
 608 /* Nonzero means don't output line number information.  */
 609
 610 extern char flag_no_line_commands;
 611
 612 /* Nonzero causes -E output not to be done, but directives such as
 613    #define that have side effects are still obeyed.  */
 614
 615 extern char flag_no_output;
 616
 617 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 618    'N' or 'U' of the command line switch.  */
 619
 620 extern char flag_dump_macros;
 621
 622 /* Nonzero means pass #include lines through to the output.  */
 623
 624 extern char flag_dump_includes;
 625
 626 /* Nonzero means process PCH files while preprocessing.  */
 627
 628 extern bool flag_pch_preprocess;
 629
 630 /* The file name to which we should write a precompiled header, or
 631    NULL if no header will be written in this compile.  */
 632
 633 extern const char *pch_file;
 634
 635 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 636    user's namespace.  */
 637
 638 extern int flag_iso;
 639
 640 /* C/ObjC language option variables.  */
 641
 642
 643 /* Nonzero means allow type mismatches in conditional expressions;
 644    just make their values `void'.  */
 645
 646 extern int flag_cond_mismatch;
 647
 648 /* Nonzero means enable C89 Amendment 1 features.  */
 649
 650 extern int flag_isoc94;
 651
 652 /* Nonzero means use the ISO C99 (or C11) dialect of C.  */
 653
 654 extern int flag_isoc99;
 655
 656 /* Nonzero means use the ISO C11 dialect of C.  */
 657
 658 extern int flag_isoc11;
 659
 660 /* Nonzero means that we have builtin functions, and main is an int.  */
 661
 662 extern int flag_hosted;
 663
 664 /* ObjC language option variables.  */
 665
 666
 667 /* Tells the compiler that this is a special run.  Do not perform any
 668    compiling, instead we are to test some platform dependent features
 669    and output a C header file with appropriate definitions.  */
 670
 671 extern int print_struct_values;
 672
 673 /* Tells the compiler what is the constant string class for ObjC.  */
 674
 675 extern const char *constant_string_class_name;
 676
 677
 678 /* C++ language option variables.  */
 679
 680 /* The reference version of the ABI for -Wabi.  */
 681
 682 extern int warn_abi_version;
 683
 684 /* Return TRUE if one of {flag_abi_version,flag_abi_compat_version} is
 685    less than N and the other is at least N.  */
 686 #define abi_compat_version_crosses(N)           \
 687   (abi_version_at_least(N)                      \
 688    != (flag_abi_compat_version == 0             \
 689        || flag_abi_compat_version >= (N)))
 690
 691 /* Return TRUE if one of {flag_abi_version,warn_abi_version} is
 692    less than N and the other is at least N, for use by -Wabi.  */
 693 #define abi_version_crosses(N)                  \
 694   (abi_version_at_least(N)                      \
 695    != (warn_abi_version == 0                    \
 696        || warn_abi_version >= (N)))
 697
 698 /* Nonzero means generate separate instantiation control files and
 699    juggle them at link time.  */
 700
 701 extern int flag_use_repository;
 702
 703 /* The supported C++ dialects.  */
 704
 705 enum cxx_dialect {
 706   cxx_unset,
 707   /* C++98 with TC1  */
 708   cxx98,
 709   cxx03 = cxx98,
 710   /* C++11  */
 711   cxx0x,
 712   cxx11 = cxx0x,
 713   /* C++14 */
 714   cxx14,
 715   /* C++1z (C++17?) */
 716   cxx1z
 717 };
 718
 719 /* The C++ dialect being used. C++98 is the default.  */
 720 extern enum cxx_dialect cxx_dialect;
 721
 722 /* Maximum template instantiation depth.  This limit is rather
 723    arbitrary, but it exists to limit the time it takes to notice
 724    excessively recursive template instantiations.  */
 725
 726 extern int max_tinst_depth;
 727
 728 /* Nonzero means that we should not issue warnings about problems that
 729    occur when the code is executed, because the code being processed
 730    is not expected to be executed.  This is set during parsing.  This
 731    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 732    not a bool, because unexecuted expressions can nest.  */
 733
 734 extern int c_inhibit_evaluation_warnings;
 735
 736 /* Whether lexing has been completed, so subsequent preprocessor
 737    errors should use the compiler's input_location.  */
 738
 739 extern bool done_lexing;
 740
 741 /* C types are partitioned into three subsets: object, function, and
 742    incomplete types.  */
 743 #define C_TYPE_OBJECT_P(type) \
 744   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 745
 746 #define C_TYPE_INCOMPLETE_P(type) \
 747   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 748
 749 #define C_TYPE_FUNCTION_P(type) \
 750   (TREE_CODE (type) == FUNCTION_TYPE)
 751
 752 /* For convenience we define a single macro to identify the class of
 753    object or incomplete types.  */
 754 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 755   (!C_TYPE_FUNCTION_P (type))
 756
 757 struct visibility_flags
 758 {
 759   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 760   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 761 };
 762
 763 /* These enumerators are possible types of unsafe conversions.  */
 764 enum conversion_safety {
 765   /* The conversion is safe.  */
 766   SAFE_CONVERSION = 0,
 767   /* Another type of conversion with problems.  */
 768   UNSAFE_OTHER,
 769   /* Conversion between signed and unsigned integers
 770      which are all warned about immediately, so this is unused.  */
 771   UNSAFE_SIGN,
 772   /* Conversions that reduce the precision of reals including conversions
 773      from reals to integers.  */
 774   UNSAFE_REAL,
 775   /* Conversions from complex to reals or integers, that discard imaginary
 776      component.  */
 777   UNSAFE_IMAGINARY
 778 };
 779
 780 /* Global visibility options.  */
 781 extern struct visibility_flags visibility_options;
 782
 783 /* Attribute table common to the C front ends.  */
 784 extern const struct attribute_spec c_common_attribute_table[];
 785 extern const struct attribute_spec c_common_format_attribute_table[];
 786
 787 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 788    ID is the identifier to use, NAME is the string.
 789    TYPE_DEP indicates whether it depends on type of the function or not
 790    (i.e. __PRETTY_FUNCTION__).  */
 791
 792 extern tree (*make_fname_decl) (location_t, tree, int);
 793
 794 /* In c-decl.c and cp/tree.c.  FIXME.  */
 795 extern void c_register_addr_space (const char *str, addr_space_t as);
 796
 797 /* In c-common.c.  */
 798 extern bool in_late_binary_op;
 799 extern const char *c_addr_space_name (addr_space_t as);
 800 extern tree identifier_global_value (tree);
 801 extern tree c_linkage_bindings (tree);
 802 extern void record_builtin_type (enum rid, const char *, tree);
 803 extern tree build_void_list_node (void);
 804 extern void start_fname_decls (void);
 805 extern void finish_fname_decls (void);
 806 extern const char *fname_as_string (int);
 807 extern tree fname_decl (location_t, unsigned, tree);
 808
 809 extern int check_user_alignment (const_tree, bool);
 810 extern bool check_function_arguments (location_t loc, const_tree, const_tree,
 811                                       int, tree *);
 812 extern void check_function_arguments_recurse (void (*)
 813                                               (void *, tree,
 814                                                unsigned HOST_WIDE_INT),
 815                                               void *, tree,
 816                                               unsigned HOST_WIDE_INT);
 817 extern bool check_builtin_function_arguments (location_t, vec<location_t>,
 818                                               tree, int, tree *);
 819 extern void check_function_format (tree, int, tree *);
 820 extern bool attribute_fallthrough_p (tree);
 821 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 822 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 823 extern bool c_common_handle_option (size_t, const char *, int, int, location_t,
 824                                     const struct cl_option_handlers *);
 825 extern bool default_handle_c_option (size_t, const char *, int);
 826 extern tree c_common_type_for_mode (machine_mode, int);
 827 extern tree c_common_type_for_size (unsigned int, int);
 828 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 829                                                 int, int);
 830 extern tree c_common_unsigned_type (tree);
 831 extern tree c_common_signed_type (tree);
 832 extern tree c_common_signed_or_unsigned_type (int, tree);
 833 extern void c_common_init_ts (void);
 834 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 835 extern enum conversion_safety unsafe_conversion_p (location_t, tree, tree,
 836                                                    bool);
 837 extern bool decl_with_nonnull_addr_p (const_tree);
 838 extern tree c_fully_fold (tree, bool, bool *);
 839 extern tree c_wrap_maybe_const (tree, bool);
 840 extern tree c_common_truthvalue_conversion (location_t, tree);
 841 extern void c_apply_type_quals_to_decl (int, tree);
 842 extern tree c_sizeof_or_alignof_type (location_t, tree, bool, bool, int);
 843 extern tree c_alignof_expr (location_t, tree);
 844 /* Print an error message for invalid operands to arith operation CODE.
 845    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 846 extern void binary_op_error (rich_location *, enum tree_code, tree, tree);
 847 extern tree fix_string_type (tree);
 848 extern tree convert_and_check (location_t, tree, tree);
 849 extern bool c_determine_visibility (tree);
 850 extern bool vector_types_compatible_elements_p (tree, tree);
 851 extern void mark_valid_location_for_stdc_pragma (bool);
 852 extern bool valid_location_for_stdc_pragma_p (void);
 853 extern void set_float_const_decimal64 (void);
 854 extern void clear_float_const_decimal64 (void);
 855 extern bool float_const_decimal64_p (void);
 856
 857 extern bool keyword_begins_type_specifier (enum rid);
 858 extern bool keyword_is_storage_class_specifier (enum rid);
 859 extern bool keyword_is_type_qualifier (enum rid);
 860 extern bool keyword_is_decl_specifier (enum rid);
 861 extern unsigned max_align_t_align (void);
 862 extern bool cxx_fundamental_alignment_p (unsigned);
 863 extern bool pointer_to_zero_sized_aggr_p (tree);
 864 extern bool bool_promoted_to_int_p (tree);
 865 extern tree fold_for_warn (tree);
 866 extern tree c_common_get_narrower (tree, int *);
 867 extern bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *);
 868
 869 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, false, 1)
 870 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, false, 1)
 871
 872 /* Subroutine of build_binary_op, used for certain operations.  */
 873 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 874
 875 /* Subroutine of build_binary_op, used for comparison operations.
 876    See if the operands have both been converted from subword integer types
 877    and, if so, perhaps change them both back to their original type.  */
 878 extern tree shorten_compare (location_t, tree *, tree *, tree *,
 879                              enum tree_code *);
 880
 881 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree,
 882                              bool = true);
 883
 884 /* Add qualifiers to a type, in the fashion for C.  */
 885 extern tree c_build_qualified_type (tree, int, tree = NULL_TREE, size_t = 0);
 886
 887 /* Build tree nodes and builtin functions common to both C and C++ language
 888    frontends.  */
 889 extern void c_common_nodes_and_builtins (void);
 890
 891 extern void disable_builtin_function (const char *);
 892
 893 extern void set_compound_literal_name (tree decl);
 894
 895 extern tree build_va_arg (location_t, tree, tree);
 896
 897 extern const unsigned int c_family_lang_mask;
 898 extern unsigned int c_common_option_lang_mask (void);
 899 extern void c_common_diagnostics_set_defaults (diagnostic_context *);
 900 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 901 extern void c_common_init_options_struct (struct gcc_options *);
 902 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 903 extern bool c_common_post_options (const char **);
 904 extern bool c_common_init (void);
 905 extern void c_common_finish (void);
 906 extern void c_common_parse_file (void);
 907 extern FILE *get_dump_info (int, dump_flags_t *);
 908 extern alias_set_type c_common_get_alias_set (tree);
 909 extern void c_register_builtin_type (tree, const char*);
 910 extern bool c_promoting_integer_type_p (const_tree);
 911 extern bool self_promoting_args_p (const_tree);
 912 extern tree strip_pointer_operator (tree);
 913 extern tree strip_pointer_or_array_types (tree);
 914 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 915
 916 /* This is the basic parsing function.  */
 917 extern void c_parse_file (void);
 918
 919 extern void c_parse_final_cleanups (void);
 920
 921 /* These macros provide convenient access to the various _STMT nodes.  */
 922
 923 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 924    if a statement expression.  */
 925 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 926   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 927
 928 /* Nonzero if a label has been added to the statement list.  */
 929 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 930   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 931
 932 /* C_MAYBE_CONST_EXPR accessors.  */
 933 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
 934   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
 935 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
 936   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
 937 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
 938   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 939 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
 940   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 941 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
 942   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
 943    && (TREE_CODE (EXPR) == INTEGER_CST                  \
 944        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
 945            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
 946
 947 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 948 #define DECL_C_BIT_FIELD(NODE) \
 949   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 950 #define SET_DECL_C_BIT_FIELD(NODE) \
 951   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 952 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 953   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 954
 955 extern tree do_case (location_t, tree, tree);
 956 extern tree build_stmt (location_t, enum tree_code, ...);
 957 extern tree build_real_imag_expr (location_t, enum tree_code, tree);
 958
 959 /* These functions must be defined by each front-end which implements
 960    a variant of the C language.  They are used in c-common.c.  */
 961
 962 extern tree build_unary_op (location_t, enum tree_code, tree, bool);
 963 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
 964 extern tree perform_integral_promotions (tree);
 965
 966 /* These functions must be defined by each front-end which implements
 967    a variant of the C language.  They are used by port files.  */
 968
 969 extern tree default_conversion (tree);
 970
 971 /* Given two integer or real types, return the type for their sum.
 972    Given two compatible ANSI C types, returns the merged type.  */
 973
 974 extern tree common_type (tree, tree);
 975
 976 extern tree decl_constant_value (tree);
 977
 978 /* Handle increment and decrement of boolean types.  */
 979 extern tree boolean_increment (enum tree_code, tree);
 980
 981 extern int case_compare (splay_tree_key, splay_tree_key);
 982
 983 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree, tree,
 984                               bool *);
 985
 986 extern tree build_function_call (location_t, tree, tree);
 987
 988 extern tree build_function_call_vec (location_t, vec<location_t>, tree,
 989                                      vec<tree, va_gc> *, vec<tree, va_gc> *);
 990
 991 extern tree resolve_overloaded_builtin (location_t, tree, vec<tree, va_gc> *);
 992
 993 extern tree finish_label_address_expr (tree, location_t);
 994
 995 /* Same function prototype, but the C and C++ front ends have
 996    different implementations.  Used in c-common.c.  */
 997 extern tree lookup_label (tree);
 998 extern tree lookup_name (tree);
 999 extern bool lvalue_p (const_tree);
1000
1001 enum lookup_name_fuzzy_kind {
1002   /* Names of types.  */
1003   FUZZY_LOOKUP_TYPENAME,
1004
1005   /* Names of function decls.  */
1006   FUZZY_LOOKUP_FUNCTION_NAME,
1007
1008   /* Any name.  */
1009   FUZZY_LOOKUP_NAME
1010 };
1011 extern const char *lookup_name_fuzzy (tree, enum lookup_name_fuzzy_kind);
1012
1013 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
1014 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
1015 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree, bool = true);
1016
1017 extern void init_c_lex (void);
1018
1019 extern void c_cpp_builtins (cpp_reader *);
1020 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
1021 extern bool c_cpp_error (cpp_reader *, int, int, rich_location *,
1022                          const char *, va_list *)
1023      ATTRIBUTE_GCC_DIAG(5,0);
1024 extern int c_common_has_attribute (cpp_reader *);
1025
1026 extern bool parse_optimize_options (tree, bool);
1027
1028 /* Positive if an implicit `extern "C"' scope has just been entered;
1029    negative if such a scope has just been exited.  */
1030 extern GTY(()) int pending_lang_change;
1031
1032 /* Information recorded about each file examined during compilation.  */
1033
1034 struct c_fileinfo
1035 {
1036   int time;     /* Time spent in the file.  */
1037
1038   /* Flags used only by C++.
1039      INTERFACE_ONLY nonzero means that we are in an "interface" section
1040      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
1041      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
1042      INTERFACE_ONLY is zero, it means that we are responsible for
1043      exporting definitions that others might need.  */
1044   short interface_only;
1045   short interface_unknown;
1046 };
1047
1048 struct c_fileinfo *get_fileinfo (const char *);
1049 extern void dump_time_statistics (void);
1050
1051 extern bool c_dump_tree (void *, tree);
1052
1053 extern void verify_sequence_points (tree);
1054
1055 extern tree fold_offsetof_1 (tree, tree_code ctx = ERROR_MARK);
1056 extern tree fold_offsetof (tree);
1057
1058 extern int complete_array_type (tree *, tree, bool);
1059
1060 extern tree builtin_type_for_size (int, bool);
1061
1062 extern void c_common_mark_addressable_vec (tree);
1063
1064 extern void set_underlying_type (tree);
1065 extern void record_types_used_by_current_var_decl (tree);
1066 extern vec<tree, va_gc> *make_tree_vector (void);
1067 extern void release_tree_vector (vec<tree, va_gc> *);
1068 extern vec<tree, va_gc> *make_tree_vector_single (tree);
1069 extern vec<tree, va_gc> *make_tree_vector_from_list (tree);
1070 extern vec<tree, va_gc> *make_tree_vector_from_ctor (tree);
1071 extern vec<tree, va_gc> *make_tree_vector_copy (const vec<tree, va_gc> *);
1072
1073 /* Used for communication between c_common_type_for_mode and
1074    c_register_builtin_type.  */
1075 extern GTY(()) tree registered_builtin_types;
1076
1077 /* Read SOURCE_DATE_EPOCH from environment to have a deterministic
1078    timestamp to replace embedded current dates to get reproducible
1079    results.  Returns -1 if SOURCE_DATE_EPOCH is not defined.  */
1080 extern time_t cb_get_source_date_epoch (cpp_reader *pfile);
1081
1082 /* The value (as a unix timestamp) corresponds to date
1083    "Dec 31 9999 23:59:59 UTC", which is the latest date that __DATE__ and
1084    __TIME__ can store.  */
1085 #define MAX_SOURCE_DATE_EPOCH HOST_WIDE_INT_C (253402300799)
1086
1087 /* Callback for libcpp for offering spelling suggestions for misspelled
1088    directives.  */
1089 extern const char *cb_get_suggestion (cpp_reader *, const char *,
1090                                       const char *const *);
1091
1092 extern GTY(()) string_concat_db *g_string_concat_db;
1093
1094 class substring_loc;
1095 extern const char *c_get_substring_location (const substring_loc &substr_loc,
1096                                              location_t *out_loc);
1097
1098 /* In c-gimplify.c  */
1099 extern void c_genericize (tree);
1100 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1101 extern tree c_build_bind_expr (location_t, tree, tree);
1102
1103 /* In c-lex.c.  */
1104 extern enum cpp_ttype
1105 conflict_marker_get_final_tok_kind (enum cpp_ttype tok1_kind);
1106
1107 /* In c-pch.c  */
1108 extern void pch_init (void);
1109 extern void pch_cpp_save_state (void);
1110 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1111 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1112                                const char *orig);
1113 extern void c_common_write_pch (void);
1114 extern void c_common_no_more_pch (void);
1115 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1116
1117 /* In *-checksum.c */
1118 extern const unsigned char executable_checksum[16];
1119
1120 /* In c-cppbuiltin.c  */
1121 extern void builtin_define_std (const char *macro);
1122 extern void builtin_define_with_value (const char *, const char *, int);
1123 extern void builtin_define_with_int_value (const char *, HOST_WIDE_INT);
1124 extern void builtin_define_type_sizeof (const char *, tree);
1125 extern void c_stddef_cpp_builtins (void);
1126 extern void fe_file_change (const line_map_ordinary *);
1127 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char);
1128
1129 /* In c-ppoutput.c  */
1130 extern void init_pp_output (FILE *);
1131 extern void preprocess_file (cpp_reader *);
1132 extern void pp_file_change (const line_map_ordinary *);
1133 extern void pp_dir_change (cpp_reader *, const char *);
1134 extern bool check_missing_format_attribute (tree, tree);
1135
1136 /* In c-omp.c  */
1137 struct omp_clause_mask
1138 {
1139   inline omp_clause_mask ();
1140   inline omp_clause_mask (uint64_t l);
1141   inline omp_clause_mask (uint64_t l, uint64_t h);
1142   inline omp_clause_mask &operator &= (omp_clause_mask);
1143   inline omp_clause_mask &operator |= (omp_clause_mask);
1144   inline omp_clause_mask operator ~ () const;
1145   inline omp_clause_mask operator & (omp_clause_mask) const;
1146   inline omp_clause_mask operator | (omp_clause_mask) const;
1147   inline omp_clause_mask operator >> (int);
1148   inline omp_clause_mask operator << (int);
1149   inline bool operator == (omp_clause_mask) const;
1150   inline bool operator != (omp_clause_mask) const;
1151   uint64_t low, high;
1152 };
1153
1154 inline
1155 omp_clause_mask::omp_clause_mask ()
1156 {
1157 }
1158
1159 inline
1160 omp_clause_mask::omp_clause_mask (uint64_t l)
1161 : low (l), high (0)
1162 {
1163 }
1164
1165 inline
1166 omp_clause_mask::omp_clause_mask (uint64_t l, uint64_t h)
1167 : low (l), high (h)
1168 {
1169 }
1170
1171 inline omp_clause_mask &
1172 omp_clause_mask::operator &= (omp_clause_mask b)
1173 {
1174   low &= b.low;
1175   high &= b.high;
1176   return *this;
1177 }
1178
1179 inline omp_clause_mask &
1180 omp_clause_mask::operator |= (omp_clause_mask b)
1181 {
1182   low |= b.low;
1183   high |= b.high;
1184   return *this;
1185 }
1186
1187 inline omp_clause_mask
1188 omp_clause_mask::operator ~ () const
1189 {
1190   omp_clause_mask ret (~low, ~high);
1191   return ret;
1192 }
1193
1194 inline omp_clause_mask
1195 omp_clause_mask::operator | (omp_clause_mask b) const
1196 {
1197   omp_clause_mask ret (low | b.low, high | b.high);
1198   return ret;
1199 }
1200
1201 inline omp_clause_mask
1202 omp_clause_mask::operator & (omp_clause_mask b) const
1203 {
1204   omp_clause_mask ret (low & b.low, high & b.high);
1205   return ret;
1206 }
1207
1208 inline omp_clause_mask
1209 omp_clause_mask::operator << (int amount)
1210 {
1211   omp_clause_mask ret;
1212   if (amount >= 64)
1213     {
1214       ret.low = 0;
1215       ret.high = low << (amount - 64);
1216     }
1217   else if (amount == 0)
1218     ret = *this;
1219   else
1220     {
1221       ret.low = low << amount;
1222       ret.high = (low >> (64 - amount)) | (high << amount);
1223     }
1224   return ret;
1225 }
1226
1227 inline omp_clause_mask
1228 omp_clause_mask::operator >> (int amount)
1229 {
1230   omp_clause_mask ret;
1231   if (amount >= 64)
1232     {
1233       ret.low = high >> (amount - 64);
1234       ret.high = 0;
1235     }
1236   else if (amount == 0)
1237     ret = *this;
1238   else
1239     {
1240       ret.low = (high << (64 - amount)) | (low >> amount);
1241       ret.high = high >> amount;
1242     }
1243   return ret;
1244 }
1245
1246 inline bool
1247 omp_clause_mask::operator == (omp_clause_mask b) const
1248 {
1249   return low == b.low && high == b.high;
1250 }
1251
1252 inline bool
1253 omp_clause_mask::operator != (omp_clause_mask b) const
1254 {
1255   return low != b.low || high != b.high;
1256 }
1257
1258 #define OMP_CLAUSE_MASK_1 omp_clause_mask (1)
1259
1260 enum c_omp_clause_split
1261 {
1262   C_OMP_CLAUSE_SPLIT_TARGET = 0,
1263   C_OMP_CLAUSE_SPLIT_TEAMS,
1264   C_OMP_CLAUSE_SPLIT_DISTRIBUTE,
1265   C_OMP_CLAUSE_SPLIT_PARALLEL,
1266   C_OMP_CLAUSE_SPLIT_FOR,
1267   C_OMP_CLAUSE_SPLIT_SIMD,
1268   C_OMP_CLAUSE_SPLIT_COUNT,
1269   C_OMP_CLAUSE_SPLIT_SECTIONS = C_OMP_CLAUSE_SPLIT_FOR,
1270   C_OMP_CLAUSE_SPLIT_TASKLOOP = C_OMP_CLAUSE_SPLIT_FOR
1271 };
1272
1273 enum c_omp_region_type
1274 {
1275   C_ORT_OMP                     = 1 << 0,
1276   C_ORT_CILK                    = 1 << 1,
1277   C_ORT_ACC                     = 1 << 2,
1278   C_ORT_DECLARE_SIMD            = 1 << 3,
1279   C_ORT_OMP_DECLARE_SIMD        = C_ORT_OMP | C_ORT_DECLARE_SIMD
1280 };
1281
1282 extern tree c_finish_omp_master (location_t, tree);
1283 extern tree c_finish_omp_taskgroup (location_t, tree);
1284 extern tree c_finish_omp_critical (location_t, tree, tree, tree);
1285 extern tree c_finish_omp_ordered (location_t, tree, tree);
1286 extern void c_finish_omp_barrier (location_t);
1287 extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
1288                                  tree, tree, tree, tree, tree, bool, bool,
1289                                  bool = false);
1290 extern void c_finish_omp_flush (location_t);
1291 extern void c_finish_omp_taskwait (location_t);
1292 extern void c_finish_omp_taskyield (location_t);
1293 extern tree c_finish_omp_for (location_t, enum tree_code, tree, tree, tree,
1294                               tree, tree, tree, tree);
1295 extern bool c_omp_check_loop_iv (tree, tree, walk_tree_lh);
1296 extern bool c_omp_check_loop_iv_exprs (location_t, tree, tree, tree, tree,
1297                                        walk_tree_lh);
1298 extern tree c_finish_oacc_wait (location_t, tree, tree);
1299 extern tree c_oacc_split_loop_clauses (tree, tree *, bool);
1300 extern void c_omp_split_clauses (location_t, enum tree_code, omp_clause_mask,
1301                                  tree, tree *);
1302 extern tree c_omp_declare_simd_clauses_to_numbers (tree, tree);
1303 extern void c_omp_declare_simd_clauses_to_decls (tree, tree);
1304 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1305
1306 /* Return next tree in the chain for chain_next walking of tree nodes.  */
1307 static inline tree
1308 c_tree_chain_next (tree t)
1309 {
1310   /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1311      kind of object, never a long chain of nodes.  Prefer
1312      TYPE_NEXT_VARIANT for types.  */
1313   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1314     return TYPE_NEXT_VARIANT (t);
1315   /* Otherwise, if there is TREE_CHAIN, return it.  */
1316   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1317     return TREE_CHAIN (t);
1318   return NULL;
1319 }
1320
1321 /* Mask used by tm_stmt_attr.  */
1322 #define TM_STMT_ATTR_OUTER      2
1323 #define TM_STMT_ATTR_ATOMIC     4
1324 #define TM_STMT_ATTR_RELAXED    8
1325
1326 /* Mask used by tm_attr_to_mask and tm_mask_to_attr.  Note that these
1327    are ordered specifically such that more restrictive attributes are
1328    at lower bit positions.  This fact is known by the C++ tm attribute
1329    inheritance code such that least bit extraction (mask & -mask) results
1330    in the most restrictive attribute.  */
1331 #define TM_ATTR_SAFE                    1
1332 #define TM_ATTR_CALLABLE                2
1333 #define TM_ATTR_PURE                    4
1334 #define TM_ATTR_IRREVOCABLE             8
1335 #define TM_ATTR_MAY_CANCEL_OUTER        16
1336
1337 /* A suffix-identifier value doublet that represents user-defined literals
1338    for C++-0x.  */
1339 enum overflow_type {
1340   OT_UNDERFLOW = -1,
1341   OT_NONE,
1342   OT_OVERFLOW
1343 };
1344
1345 struct GTY(()) tree_userdef_literal {
1346   struct tree_base base;
1347   tree suffix_id;
1348   tree value;
1349   tree num_string;
1350   enum overflow_type overflow;
1351 };
1352
1353 #define USERDEF_LITERAL_SUFFIX_ID(NODE) \
1354   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->suffix_id)
1355
1356 #define USERDEF_LITERAL_VALUE(NODE) \
1357   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->value)
1358
1359 #define USERDEF_LITERAL_OVERFLOW(NODE) \
1360   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->overflow)
1361
1362 #define USERDEF_LITERAL_NUM_STRING(NODE) \
1363   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->num_string)
1364
1365 #define USERDEF_LITERAL_TYPE(NODE) \
1366   (TREE_TYPE (USERDEF_LITERAL_VALUE (NODE)))
1367
1368 extern tree build_userdef_literal (tree suffix_id, tree value,
1369                                    enum overflow_type overflow,
1370                                    tree num_string);
1371
1372 extern bool convert_vector_to_array_for_subscript (location_t, tree *, tree);
1373
1374 /* Possibe cases of scalar_to_vector conversion.  */
1375 enum stv_conv {
1376   stv_error,        /* Error occurred.  */
1377   stv_nothing,      /* Nothing happened.  */
1378   stv_firstarg,     /* First argument must be expanded.  */
1379   stv_secondarg     /* Second argument must be expanded.  */
1380 };
1381
1382 extern enum stv_conv scalar_to_vector (location_t loc, enum tree_code code,
1383                                        tree op0, tree op1, bool);
1384
1385 /* In c-cilkplus.c  */
1386 extern tree c_validate_cilk_plus_loop (tree *, int *, void *);
1387 extern bool c_check_cilk_loop (location_t, tree);
1388
1389 /* These #defines allow users to access different operands of the
1390    array notation tree.  */
1391
1392 #define ARRAY_NOTATION_CHECK(NODE) TREE_CHECK (NODE, ARRAY_NOTATION_REF)
1393 #define ARRAY_NOTATION_ARRAY(NODE) \
1394   TREE_OPERAND (ARRAY_NOTATION_CHECK (NODE), 0)
1395 #define ARRAY_NOTATION_START(NODE) \
1396   TREE_OPERAND (ARRAY_NOTATION_CHECK (NODE), 1)
1397 #define ARRAY_NOTATION_LENGTH(NODE) \
1398   TREE_OPERAND (ARRAY_NOTATION_CHECK (NODE), 2)
1399 #define ARRAY_NOTATION_STRIDE(NODE) \
1400   TREE_OPERAND (ARRAY_NOTATION_CHECK (NODE), 3)
1401
1402 /* This structure holds all the scalar values and its appropriate variable
1403    replacment.  It is mainly used by the function that pulls all the invariant
1404    parts that should be executed only once, which comes with array notation
1405    expressions.  */
1406 struct inv_list
1407 {
1408   vec<tree, va_gc> *list_values;
1409   vec<tree, va_gc> *replacement;
1410   vec<enum tree_code, va_gc> *additional_tcodes;
1411 };
1412
1413 /* This structure holds all the important components that can be extracted
1414    from an ARRAY_NOTATION_REF expression.  It is used to pass array notation
1415    information between the functions that are responsible for expansion.  */
1416 typedef struct cilkplus_an_parts
1417 {
1418   tree value;
1419   tree start;
1420   tree length;
1421   tree stride;
1422   bool is_vector;
1423 } an_parts;
1424
1425 /* This structure holds the components necessary to create the loop around
1426    the ARRAY_REF that is created using the ARRAY_NOTATION information.  */
1427
1428 typedef struct cilkplus_an_loop_parts
1429 {
1430   tree var;         /* Loop induction variable.  */
1431   tree incr;        /* Loop increment/decrement expression.  */
1432   tree cmp;         /* Loop condition.  */
1433   tree ind_init;    /* Initialization of the loop induction variable.  */
1434 } an_loop_parts;
1435
1436 /* In array-notation-common.c.  */
1437 extern HOST_WIDE_INT extract_sec_implicit_index_arg (location_t, tree);
1438 extern bool is_sec_implicit_index_fn (tree);
1439 extern void array_notation_init_builtins (void);
1440 extern struct c_expr fix_array_notation_expr (location_t, enum tree_code,
1441                                               struct c_expr);
1442 extern bool contains_array_notation_expr (tree);
1443 extern tree expand_array_notation_exprs (tree);
1444 extern tree fix_conditional_array_notations (tree);
1445 extern tree find_correct_array_notation_type (tree);
1446 extern bool length_mismatch_in_expr_p (location_t, vec<vec<an_parts> >);
1447 extern enum built_in_function is_cilkplus_reduce_builtin (tree);
1448 extern bool find_rank (location_t, tree, tree, bool, size_t *);
1449 extern void extract_array_notation_exprs (tree, bool, vec<tree, va_gc> **);
1450 extern void replace_array_notations (tree *, bool, vec<tree, va_gc> *,
1451                                      vec<tree, va_gc> *);
1452 extern tree find_inv_trees (tree *, int *, void *);
1453 extern tree replace_inv_trees (tree *, int *, void *);
1454 extern tree find_correct_array_notation_type (tree op);
1455 extern void cilkplus_extract_an_triplets (vec<tree, va_gc> *, size_t, size_t,
1456                                           vec<vec<an_parts> > *);
1457 extern vec <tree, va_gc> *fix_sec_implicit_args
1458   (location_t, vec <tree, va_gc> *, vec<an_loop_parts>, size_t, tree);
1459 extern bool is_cilkplus_vector_p (tree);
1460
1461 /* In cilk.c.  */
1462 extern tree insert_cilk_frame (tree);
1463 extern void cilk_init_builtins (void);
1464 extern int gimplify_cilk_spawn (tree *);
1465 extern void cilk_install_body_with_frame_cleanup (tree, tree, void *);
1466 extern bool cilk_detect_spawn_and_unwrap (tree *);
1467 extern bool cilk_set_spawn_marker (location_t, tree);
1468 extern tree build_cilk_sync (void);
1469 extern tree build_cilk_spawn (location_t, tree);
1470 extern tree make_cilk_frame (tree);
1471 extern tree create_cilk_function_exit (tree, bool, bool);
1472 extern void cilk_outline (tree, tree *, void *);
1473 extern bool contains_cilk_spawn_stmt (tree);
1474 extern tree cilk_for_number_of_iterations (tree);
1475 extern bool check_no_cilk (tree, const char *, const char *,
1476                            location_t loc = UNKNOWN_LOCATION);
1477 extern bool reject_gcc_builtin (const_tree, location_t = UNKNOWN_LOCATION);
1478 extern bool valid_array_size_p (location_t, tree, tree);
1479
1480 extern bool cilk_ignorable_spawn_rhs_op (tree);
1481 extern bool cilk_recognize_spawn (tree, tree *);
1482
1483 /* In c-warn.c.  */
1484 extern void constant_expression_warning (tree);
1485 extern void constant_expression_error (tree);
1486 extern void overflow_warning (location_t, tree);
1487 extern void warn_logical_operator (location_t, enum tree_code, tree,
1488                                    enum tree_code, tree, enum tree_code, tree);
1489 extern void warn_tautological_cmp (location_t, enum tree_code, tree, tree);
1490 extern void warn_logical_not_parentheses (location_t, enum tree_code, tree,
1491                                           tree);
1492 extern bool warn_if_unused_value (const_tree, location_t);
1493 extern bool strict_aliasing_warning (tree, tree, tree);
1494 extern void sizeof_pointer_memaccess_warning (location_t *, tree,
1495                                               vec<tree, va_gc> *, tree *,
1496                                               bool (*) (tree, tree));
1497 extern void check_main_parameter_types (tree decl);
1498 extern void warnings_for_convert_and_check (location_t, tree, tree, tree);
1499 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree, bool,
1500                                   bool);
1501 extern void warn_for_omitted_condop (location_t, tree);
1502 extern void warn_for_restrict (unsigned, tree *, unsigned);
1503
1504 /* Places where an lvalue, or modifiable lvalue, may be required.
1505    Used to select diagnostic messages in lvalue_error and
1506    readonly_error.  */
1507 enum lvalue_use {
1508   lv_assign,
1509   lv_increment,
1510   lv_decrement,
1511   lv_addressof,
1512   lv_asm
1513 };
1514
1515 extern void lvalue_error (location_t, enum lvalue_use);
1516 extern void invalid_indirection_error (location_t, tree, ref_operator);
1517 extern void readonly_error (location_t, tree, enum lvalue_use);
1518 extern void warn_array_subscript_with_type_char (location_t, tree);
1519 extern void warn_about_parentheses (location_t,
1520                                     enum tree_code,
1521                                     enum tree_code, tree,
1522                                     enum tree_code, tree);
1523 extern void warn_for_unused_label (tree label);
1524 extern void warn_for_div_by_zero (location_t, tree divisor);
1525 extern void warn_for_memset (location_t, tree, tree, int);
1526 extern void warn_for_sign_compare (location_t,
1527                                    tree orig_op0, tree orig_op1,
1528                                    tree op0, tree op1,
1529                                    tree result_type,
1530                                    enum tree_code resultcode);
1531 extern void do_warn_double_promotion (tree, tree, tree, const char *,
1532                                       location_t);
1533 extern void do_warn_unused_parameter (tree);
1534 extern void record_locally_defined_typedef (tree);
1535 extern void maybe_record_typedef_use (tree);
1536 extern void maybe_warn_unused_local_typedefs (void);
1537 extern void maybe_warn_bool_compare (location_t, enum tree_code, tree, tree);
1538 extern bool maybe_warn_shift_overflow (location_t, tree, tree);
1539 extern void warn_duplicated_cond_add_or_warn (location_t, tree, vec<tree> **);
1540 extern bool diagnose_mismatched_attributes (tree, tree);
1541 extern tree do_warn_duplicated_branches_r (tree *, int *, void *);
1542
1543 /* In c-attribs.c.  */
1544 extern bool attribute_takes_identifier_p (const_tree);
1545 extern tree handle_unused_attribute (tree *, tree, tree, int, bool *);
1546 extern int parse_tm_stmt_attr (tree, int);
1547 extern int tm_attr_to_mask (tree);
1548 extern tree tm_mask_to_attr (int);
1549 extern tree find_tm_attribute (tree);
1550
1551 extern enum flt_eval_method
1552 excess_precision_mode_join (enum flt_eval_method, enum flt_eval_method);
1553
1554 extern int c_flt_eval_method (bool ts18661_p);
1555
1556 #if CHECKING_P
1557 namespace selftest {
1558   extern void c_format_c_tests (void);
1559   extern void run_c_tests (void);
1560 } // namespace selftest
1561 #endif /* #if CHECKING_P */
1562
1563 #endif /* ! GCC_C_COMMON_H */