gcc/c-family/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987-2021 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 #include "wide-int-bitmask.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, RID_ATOMIC,
  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_PROPATOMIC, RID_NONATOMIC,
  89
  90   /* ObjC nullability support keywords that also can appear in the
  91      property attribute context.  These values should remain contiguous
  92      with the other property attributes.  */
  93   RID_NULL_UNSPECIFIED, RID_NULLABLE, RID_NONNULL, RID_NULL_RESETTABLE,
  94
  95   /* C (reserved and imaginary types not implemented, so any use is a
  96      syntax error) */
  97   RID_IMAGINARY,
  98
  99   /* C */
 100   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
 101   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
 102   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
 103   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
 104   RID_SIZEOF,
 105
 106   /* C extensions */
 107   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
 108   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
 109   RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,          RID_BUILTIN_SHUFFLE,
 110   RID_BUILTIN_SHUFFLEVECTOR,   RID_BUILTIN_CONVERTVECTOR,   RID_BUILTIN_TGMATH,
 111   RID_BUILTIN_HAS_ATTRIBUTE,
 112   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
 113
 114   /* TS 18661-3 keywords, in the same sequence as the TI_* values.  */
 115   RID_FLOAT16,
 116   RID_FLOATN_NX_FIRST = RID_FLOAT16,
 117   RID_FLOAT32,
 118   RID_FLOAT64,
 119   RID_FLOAT128,
 120   RID_FLOAT32X,
 121   RID_FLOAT64X,
 122   RID_FLOAT128X,
 123 #define CASE_RID_FLOATN_NX                                              \
 124   case RID_FLOAT16: case RID_FLOAT32: case RID_FLOAT64: case RID_FLOAT128: \
 125   case RID_FLOAT32X: case RID_FLOAT64X: case RID_FLOAT128X
 126
 127   RID_FRACT, RID_ACCUM, RID_AUTO_TYPE, RID_BUILTIN_CALL_WITH_STATIC_CHAIN,
 128
 129   /* "__GIMPLE", for the GIMPLE-parsing extension to the C frontend. */
 130   RID_GIMPLE,
 131
 132   /* "__PHI", for parsing PHI function in GIMPLE FE.  */
 133   RID_PHI,
 134
 135   /* "__RTL", for the RTL-parsing extension to the C frontend.  */
 136   RID_RTL,
 137
 138   /* C11 */
 139   RID_ALIGNAS, RID_GENERIC,
 140
 141   /* This means to warn that this is a C++ keyword, and then treat it
 142      as a normal identifier.  */
 143   RID_CXX_COMPAT_WARN,
 144
 145   /* GNU transactional memory extension */
 146   RID_TRANSACTION_ATOMIC, RID_TRANSACTION_RELAXED, RID_TRANSACTION_CANCEL,
 147
 148   /* Too many ways of getting the name of a function as a string */
 149   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
 150
 151   /* C++ (some of these are keywords in Objective-C as well, but only
 152      if they appear after a '@') */
 153   RID_BOOL,     RID_WCHAR,    RID_CLASS,
 154   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
 155   RID_TEMPLATE, RID_NULL,     RID_CATCH,
 156   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
 157   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
 158   RID_THIS,     RID_THROW,    RID_TRUE,
 159   RID_TRY,      RID_TYPENAME, RID_TYPEID,
 160   RID_USING,    RID_CHAR16,   RID_CHAR32,
 161
 162   /* casts */
 163   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
 164
 165   /* C++ extensions */
 166   RID_ADDRESSOF,               RID_BASES,
 167   RID_BUILTIN_LAUNDER,         RID_DIRECT_BASES,
 168   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
 169   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
 170   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
 171   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_UNIQUE_OBJ_REPRESENTATIONS,
 172   RID_HAS_VIRTUAL_DESTRUCTOR,  RID_BUILTIN_BIT_CAST,
 173   RID_IS_ABSTRACT,             RID_IS_AGGREGATE,
 174   RID_IS_BASE_OF,              RID_IS_CLASS,
 175   RID_IS_EMPTY,                RID_IS_ENUM,
 176   RID_IS_FINAL,                RID_IS_LAYOUT_COMPATIBLE,
 177   RID_IS_LITERAL_TYPE,
 178   RID_IS_POINTER_INTERCONVERTIBLE_BASE_OF,
 179   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 180   RID_IS_SAME_AS,
 181   RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,
 182   RID_IS_TRIVIALLY_ASSIGNABLE, RID_IS_TRIVIALLY_CONSTRUCTIBLE,
 183   RID_IS_TRIVIALLY_COPYABLE,
 184   RID_IS_UNION,                RID_UNDERLYING_TYPE,
 185   RID_IS_ASSIGNABLE,           RID_IS_CONSTRUCTIBLE,
 186   RID_IS_NOTHROW_ASSIGNABLE,   RID_IS_NOTHROW_CONSTRUCTIBLE,
 187
 188   /* C++11 */
 189   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 190
 191   /* C++20 */
 192   RID_CONSTINIT, RID_CONSTEVAL,
 193
 194   /* char8_t */
 195   RID_CHAR8,
 196
 197   /* C++ concepts */
 198   RID_CONCEPT, RID_REQUIRES,
 199
 200   /* C++ modules.  */
 201   RID__MODULE, RID__IMPORT, RID__EXPORT, /* Internal tokens.  */
 202
 203   /* C++ coroutines */
 204   RID_CO_AWAIT, RID_CO_YIELD, RID_CO_RETURN,
 205
 206   /* C++ transactional memory.  */
 207   RID_ATOMIC_NOEXCEPT, RID_ATOMIC_CANCEL, RID_SYNCHRONIZED,
 208
 209   /* Objective-C ("AT" reserved words - they are only keywords when
 210      they follow '@')  */
 211   RID_AT_ENCODE,   RID_AT_END,
 212   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 213   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 214   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 215   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 216   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 217   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 218   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 219   RID_AT_INTERFACE,
 220   RID_AT_IMPLEMENTATION,
 221
 222   /* Named address support, mapping the keyword to a particular named address
 223      number.  Named address space 0 is reserved for the generic address.  If
 224      there are more than 254 named addresses, the addr_space_t type will need
 225      to be grown from an unsigned char to unsigned short.  */
 226   RID_ADDR_SPACE_0,             /* generic address */
 227   RID_ADDR_SPACE_1,
 228   RID_ADDR_SPACE_2,
 229   RID_ADDR_SPACE_3,
 230   RID_ADDR_SPACE_4,
 231   RID_ADDR_SPACE_5,
 232   RID_ADDR_SPACE_6,
 233   RID_ADDR_SPACE_7,
 234   RID_ADDR_SPACE_8,
 235   RID_ADDR_SPACE_9,
 236   RID_ADDR_SPACE_10,
 237   RID_ADDR_SPACE_11,
 238   RID_ADDR_SPACE_12,
 239   RID_ADDR_SPACE_13,
 240   RID_ADDR_SPACE_14,
 241   RID_ADDR_SPACE_15,
 242
 243   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 244   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 245
 246   /* __intN keywords.  The _N_M here doesn't correspond to the intN
 247      in the keyword; use the bitsize in int_n_t_data_t[M] for that.
 248      For example, if int_n_t_data_t[0].bitsize is 13, then RID_INT_N_0
 249      is for __int13.  */
 250
 251   /* Note that the range to use is RID_FIRST_INT_N through
 252      RID_FIRST_INT_N + NUM_INT_N_ENTS - 1 and c-parser.c has a list of
 253      all RID_INT_N_* in a case statement.  */
 254
 255   RID_INT_N_0,
 256   RID_INT_N_1,
 257   RID_INT_N_2,
 258   RID_INT_N_3,
 259
 260   RID_FIRST_INT_N = RID_INT_N_0,
 261   RID_LAST_INT_N = RID_INT_N_3,
 262
 263   RID_MAX,
 264
 265   RID_FIRST_MODIFIER = RID_STATIC,
 266   RID_LAST_MODIFIER = RID_ONEWAY,
 267
 268   RID_FIRST_CXX11 = RID_CONSTEXPR,
 269   RID_LAST_CXX11 = RID_STATIC_ASSERT,
 270   RID_FIRST_CXX20 = RID_CONSTINIT,
 271   RID_LAST_CXX20 = RID_CONSTINIT,
 272   RID_FIRST_AT = RID_AT_ENCODE,
 273   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 274   RID_FIRST_PQ = RID_IN,
 275   RID_LAST_PQ = RID_ONEWAY,
 276   RID_FIRST_PATTR = RID_GETTER,
 277   RID_LAST_PATTR = RID_NULL_RESETTABLE
 278 };
 279
 280 #define OBJC_IS_AT_KEYWORD(rid) \
 281   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 282    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 283
 284 #define OBJC_IS_PQ_KEYWORD(rid) \
 285   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 286    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 287
 288 /* Keywords permitted in an @property attribute context.  */
 289 #define OBJC_IS_PATTR_KEYWORD(rid) \
 290   ((((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 291      (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)) \
 292    || rid == RID_CLASS)
 293
 294 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 295    'class') which are shared in a subtle way between Objective-C and
 296    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 297    finds '@' followed by one of these identifiers (eg, '@class'), it
 298    recognizes the whole as an Objective-C keyword.  If the identifier
 299    is found elsewhere, it follows the rules of the C/C++ language.
 300  */
 301 #define OBJC_IS_CXX_KEYWORD(rid) \
 302   (rid == RID_CLASS || rid == RID_SYNCHRONIZED                  \
 303    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 304    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 305
 306 /* The elements of `ridpointers' are identifier nodes for the reserved
 307    type names and storage classes.  It is indexed by a RID_... value.  */
 308 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 309
 310 /* Standard named or nameless data types of the C compiler.  */
 311
 312 enum c_tree_index
 313 {
 314     CTI_CHAR8_TYPE,
 315     CTI_CHAR16_TYPE,
 316     CTI_CHAR32_TYPE,
 317     CTI_WCHAR_TYPE,
 318     CTI_UNDERLYING_WCHAR_TYPE,
 319     CTI_WINT_TYPE,
 320     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 321     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 322     CTI_INTMAX_TYPE,
 323     CTI_UINTMAX_TYPE,
 324     CTI_WIDEST_INT_LIT_TYPE,
 325     CTI_WIDEST_UINT_LIT_TYPE,
 326
 327     /* Types for <stdint.h>, that may not be defined on all
 328        targets.  */
 329     CTI_SIG_ATOMIC_TYPE,
 330     CTI_INT8_TYPE,
 331     CTI_INT16_TYPE,
 332     CTI_INT32_TYPE,
 333     CTI_INT64_TYPE,
 334     CTI_UINT8_TYPE,
 335     CTI_UINT16_TYPE,
 336     CTI_UINT32_TYPE,
 337     CTI_UINT64_TYPE,
 338     CTI_INT_LEAST8_TYPE,
 339     CTI_INT_LEAST16_TYPE,
 340     CTI_INT_LEAST32_TYPE,
 341     CTI_INT_LEAST64_TYPE,
 342     CTI_UINT_LEAST8_TYPE,
 343     CTI_UINT_LEAST16_TYPE,
 344     CTI_UINT_LEAST32_TYPE,
 345     CTI_UINT_LEAST64_TYPE,
 346     CTI_INT_FAST8_TYPE,
 347     CTI_INT_FAST16_TYPE,
 348     CTI_INT_FAST32_TYPE,
 349     CTI_INT_FAST64_TYPE,
 350     CTI_UINT_FAST8_TYPE,
 351     CTI_UINT_FAST16_TYPE,
 352     CTI_UINT_FAST32_TYPE,
 353     CTI_UINT_FAST64_TYPE,
 354     CTI_INTPTR_TYPE,
 355     CTI_UINTPTR_TYPE,
 356
 357     CTI_CHAR_ARRAY_TYPE,
 358     CTI_CHAR8_ARRAY_TYPE,
 359     CTI_CHAR16_ARRAY_TYPE,
 360     CTI_CHAR32_ARRAY_TYPE,
 361     CTI_WCHAR_ARRAY_TYPE,
 362     CTI_STRING_TYPE,
 363     CTI_CONST_STRING_TYPE,
 364
 365     /* Type for boolean expressions (bool in C++, int in C).  */
 366     CTI_TRUTHVALUE_TYPE,
 367     CTI_TRUTHVALUE_TRUE,
 368     CTI_TRUTHVALUE_FALSE,
 369
 370     CTI_DEFAULT_FUNCTION_TYPE,
 371
 372     CTI_NULL,
 373
 374     /* These are not types, but we have to look them up all the time.  */
 375     CTI_FUNCTION_NAME_DECL,
 376     CTI_PRETTY_FUNCTION_NAME_DECL,
 377     CTI_C99_FUNCTION_NAME_DECL,
 378
 379     CTI_MODULE_HWM,
 380     /* Below here entities change during compilation.  */
 381
 382     CTI_SAVED_FUNCTION_NAME_DECLS,
 383
 384     CTI_MAX
 385 };
 386
 387 #define C_CPP_HASHNODE(id) \
 388   (&(((struct c_common_identifier *) (id))->node))
 389 #define C_RID_CODE(id) \
 390   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 391 #define C_SET_RID_CODE(id, code) \
 392   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 393
 394 /* Identifier part common to the C front ends.  Inherits from
 395    tree_identifier, despite appearances.  */
 396 struct GTY(()) c_common_identifier {
 397   struct tree_common common;
 398   struct cpp_hashnode node;
 399 };
 400
 401 /* An entry in the reserved keyword table.  */
 402
 403 struct c_common_resword
 404 {
 405   const char *const word;
 406   ENUM_BITFIELD(rid) const rid : 16;
 407   const unsigned int disable   : 16;
 408 };
 409
 410 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 411
 412 extern machine_mode c_default_pointer_mode;
 413
 414 /* Extra cpp_ttype values for C++.  */
 415
 416 /* A token type for template-ids.  If a template-id is processed while
 417    parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
 418    the value of the CPP_TEMPLATE_ID is whatever was returned by
 419    cp_parser_template_id.  */
 420 #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
 421
 422 /* A token type for nested-name-specifiers.  If a
 423    nested-name-specifier is processed while parsing tentatively, it is
 424    replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
 425    CPP_NESTED_NAME_SPECIFIER is whatever was returned by
 426    cp_parser_nested_name_specifier_opt.  */
 427 #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
 428
 429 /* A token type for pre-parsed C++0x decltype.  */
 430 #define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
 431
 432 /* A token type for pre-parsed primary-expression (lambda- or statement-).  */
 433 #define CPP_PREPARSED_EXPR ((enum cpp_ttype) (CPP_DECLTYPE + 1))
 434
 435 /* The number of token types, including C++-specific ones.  */
 436 #define N_CP_TTYPES ((int) (CPP_PREPARSED_EXPR + 1))
 437
 438 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 439    mask) is _true_.  Thus for keywords which are present in all
 440    languages the disable field is zero.  */
 441
 442 #define D_CONLY         0x0001  /* C only (not in C++).  */
 443 #define D_CXXONLY       0x0002  /* C++ only (not in C).  */
 444 #define D_C99           0x0004  /* In C, C99 only.  */
 445 #define D_CXX11         0x0008  /* In C++, C++11 only.  */
 446 #define D_EXT           0x0010  /* GCC extension.  */
 447 #define D_EXT89         0x0020  /* GCC extension incorporated in C99.  */
 448 #define D_ASM           0x0040  /* Disabled by -fno-asm.  */
 449 #define D_OBJC          0x0080  /* In Objective C and neither C nor C++.  */
 450 #define D_CXX_OBJC      0x0100  /* In Objective C, and C++, but not C.  */
 451 #define D_CXXWARN       0x0200  /* In C warn with -Wcxx-compat.  */
 452 #define D_CXX_CONCEPTS  0x0400  /* In C++, only with concepts.  */
 453 #define D_TRANSMEM      0X0800  /* C++ transactional memory TS.  */
 454 #define D_CXX_CHAR8_T   0X1000  /* In C++, only with -fchar8_t.  */
 455 #define D_CXX20         0x2000  /* In C++, C++20 only.  */
 456 #define D_CXX_COROUTINES 0x4000  /* In C++, only with coroutines.  */
 457 #define D_CXX_MODULES   0x8000  /* In C++, only with modules.  */
 458
 459 #define D_CXX_CONCEPTS_FLAGS D_CXXONLY | D_CXX_CONCEPTS
 460 #define D_CXX_CHAR8_T_FLAGS D_CXXONLY | D_CXX_CHAR8_T
 461 #define D_CXX_MODULES_FLAGS (D_CXXONLY | D_CXX_MODULES)
 462 #define D_CXX_COROUTINES_FLAGS (D_CXXONLY | D_CXX_COROUTINES)
 463
 464 /* The reserved keyword table.  */
 465 extern const struct c_common_resword c_common_reswords[];
 466
 467 /* The number of items in the reserved keyword table.  */
 468 extern const unsigned int num_c_common_reswords;
 469
 470 #define char8_type_node                 c_global_trees[CTI_CHAR8_TYPE]
 471 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 472 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 473 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 474 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 475 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 476 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 477 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 478 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 479 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 480 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 481 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 482
 483 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 484 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 485 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 486 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 487 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 488 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 489 #define c_uint16_type_node              c_global_trees[CTI_UINT16_TYPE]
 490 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 491 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 492 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 493 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 494 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 495 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 496 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 497 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 498 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 499 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 500 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 501 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 502 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 503 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 504 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 505 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 506 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 507 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 508 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 509 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 510
 511 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 512 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 513 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 514
 515 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 516 #define char8_array_type_node           c_global_trees[CTI_CHAR8_ARRAY_TYPE]
 517 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 518 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 519 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 520 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 521 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 522
 523 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 524
 525 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 526 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 527 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 528 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 529
 530 /* The node for C++ `__null'.  */
 531 #define null_node                       c_global_trees[CTI_NULL]
 532
 533 extern GTY(()) tree c_global_trees[CTI_MAX];
 534
 535 /* Mark which labels are explicitly declared.
 536    These may be shadowed, and may be referenced from nested functions.  */
 537 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 538
 539 enum c_language_kind
 540 {
 541   clk_c         = 0,            /* C90, C94, C99, C11 or C2X */
 542   clk_objc      = 1,            /* clk_c with ObjC features.  */
 543   clk_cxx       = 2,            /* ANSI/ISO C++ */
 544   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 545 };
 546
 547 /* To test for a specific language use c_language, defined by each
 548    front end.  For "ObjC features" or "not C++" use the macros.  */
 549 extern c_language_kind c_language;
 550
 551 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 552 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 553
 554 /* The various name of operator that appears in error messages. */
 555 enum ref_operator {
 556   /* NULL */
 557   RO_NULL,
 558   /* array indexing */
 559   RO_ARRAY_INDEXING,
 560   /* unary * */
 561   RO_UNARY_STAR,
 562   /* -> */
 563   RO_ARROW,
 564   /* implicit conversion */
 565   RO_IMPLICIT_CONVERSION,
 566   /* ->* */
 567   RO_ARROW_STAR
 568 };
 569
 570 /* Information about a statement tree.  */
 571
 572 struct GTY(()) stmt_tree_s {
 573   /* A stack of statement lists being collected.  */
 574   vec<tree, va_gc> *x_cur_stmt_list;
 575
 576   /* In C++, Nonzero if we should treat statements as full
 577      expressions.  In particular, this variable is non-zero if at the
 578      end of a statement we should destroy any temporaries created
 579      during that statement.  Similarly, if, at the end of a block, we
 580      should destroy any local variables in this block.  Normally, this
 581      variable is nonzero, since those are the normal semantics of
 582      C++.
 583
 584      This flag has no effect in C.  */
 585   int stmts_are_full_exprs_p;
 586 };
 587
 588 typedef struct stmt_tree_s *stmt_tree;
 589
 590 /* Global state pertinent to the current function.  Some C dialects
 591    extend this structure with additional fields.  */
 592
 593 struct GTY(()) c_language_function {
 594   /* While we are parsing the function, this contains information
 595      about the statement-tree that we are building.  */
 596   struct stmt_tree_s x_stmt_tree;
 597
 598   /* Vector of locally defined typedefs, for
 599      -Wunused-local-typedefs.  */
 600   vec<tree, va_gc> *local_typedefs;
 601 };
 602
 603 #define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
 604
 605 /* When building a statement-tree, this is the current statement list
 606    being collected.  */
 607 #define cur_stmt_list   (stmt_list_stack->last ())
 608
 609 #define building_stmt_list_p() (stmt_list_stack && !stmt_list_stack->is_empty())
 610
 611 /* Language-specific hooks.  */
 612
 613 /* If non-NULL, this function is called after a precompile header file
 614    is loaded.  */
 615 extern void (*lang_post_pch_load) (void);
 616
 617 extern void push_file_scope (void);
 618 extern void pop_file_scope (void);
 619 extern stmt_tree current_stmt_tree (void);
 620 extern tree push_stmt_list (void);
 621 extern tree pop_stmt_list (tree);
 622 extern tree add_stmt (tree);
 623 extern void push_cleanup (tree, tree, bool);
 624
 625 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 626                                location_t, tree, tree);
 627 extern tree build_indirect_ref (location_t, tree, ref_operator);
 628
 629 extern bool has_c_linkage (const_tree decl);
 630 extern bool c_decl_implicit (const_tree);
 631 \f
 632 /* Switches common to the C front ends.  */
 633
 634 /* Nonzero means don't output line number information.  */
 635
 636 extern char flag_no_line_commands;
 637
 638 /* Nonzero causes -E output not to be done, but directives such as
 639    #define that have side effects are still obeyed.  */
 640
 641 extern char flag_no_output;
 642
 643 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 644    'N' or 'U' of the command line switch.  */
 645
 646 extern char flag_dump_macros;
 647
 648 /* Nonzero means pass #include lines through to the output.  */
 649
 650 extern char flag_dump_includes;
 651
 652 /* Nonzero means process PCH files while preprocessing.  */
 653
 654 extern bool flag_pch_preprocess;
 655
 656 /* The file name to which we should write a precompiled header, or
 657    NULL if no header will be written in this compile.  */
 658
 659 extern const char *pch_file;
 660
 661 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 662    user's namespace.  */
 663
 664 extern int flag_iso;
 665
 666 /* C/ObjC language option variables.  */
 667
 668
 669 /* Nonzero means allow type mismatches in conditional expressions;
 670    just make their values `void'.  */
 671
 672 extern int flag_cond_mismatch;
 673
 674 /* Nonzero means enable C89 Amendment 1 features.  */
 675
 676 extern int flag_isoc94;
 677
 678 /* Nonzero means use the ISO C99 (or later) dialect of C.  */
 679
 680 extern int flag_isoc99;
 681
 682 /* Nonzero means use the ISO C11 (or later) dialect of C.  */
 683
 684 extern int flag_isoc11;
 685
 686 /* Nonzero means use the ISO C2X dialect of C.  */
 687
 688 extern int flag_isoc2x;
 689
 690 /* Nonzero means that we have builtin functions, and main is an int.  */
 691
 692 extern int flag_hosted;
 693
 694 /* ObjC language option variables.  */
 695
 696
 697 /* Tells the compiler that this is a special run.  Do not perform any
 698    compiling, instead we are to test some platform dependent features
 699    and output a C header file with appropriate definitions.  */
 700
 701 extern int print_struct_values;
 702
 703 /* Tells the compiler what is the constant string class for ObjC.  */
 704
 705 extern const char *constant_string_class_name;
 706
 707
 708 /* C++ language option variables.  */
 709
 710 /* The reference version of the ABI for -Wabi.  */
 711
 712 extern int warn_abi_version;
 713
 714 /* Return TRUE if one of {flag_abi_version,flag_abi_compat_version} is
 715    less than N and the other is at least N.  */
 716 #define abi_compat_version_crosses(N)           \
 717   (abi_version_at_least(N)                      \
 718    != (flag_abi_compat_version == 0             \
 719        || flag_abi_compat_version >= (N)))
 720
 721 /* Return TRUE if one of {flag_abi_version,warn_abi_version} is
 722    less than N and the other is at least N, for use by -Wabi.  */
 723 #define abi_version_crosses(N)                  \
 724   (abi_version_at_least(N)                      \
 725    != (warn_abi_version == 0                    \
 726        || warn_abi_version >= (N)))
 727
 728 /* The supported C++ dialects.  */
 729
 730 enum cxx_dialect {
 731   cxx_unset,
 732   /* C++98 with TC1  */
 733   cxx98,
 734   cxx03 = cxx98,
 735   /* C++11  */
 736   cxx0x,
 737   cxx11 = cxx0x,
 738   /* C++14 */
 739   cxx14,
 740   /* C++17 */
 741   cxx17,
 742   /* C++20 */
 743   cxx20,
 744   /* C++23 */
 745   cxx23
 746 };
 747
 748 /* The C++ dialect being used. C++98 is the default.  */
 749 extern enum cxx_dialect cxx_dialect;
 750
 751 /* Maximum template instantiation depth.  This limit is rather
 752    arbitrary, but it exists to limit the time it takes to notice
 753    excessively recursive template instantiations.  */
 754
 755 extern int max_tinst_depth;
 756
 757 /* Nonzero means that we should not issue warnings about problems that
 758    occur when the code is executed, because the code being processed
 759    is not expected to be executed.  This is set during parsing.  This
 760    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 761    not a bool, because unexecuted expressions can nest.  */
 762
 763 extern int c_inhibit_evaluation_warnings;
 764
 765 /* Whether lexing has been completed, so subsequent preprocessor
 766    errors should use the compiler's input_location.  */
 767
 768 extern bool done_lexing;
 769
 770 /* C types are partitioned into three subsets: object, function, and
 771    incomplete types.  */
 772 #define C_TYPE_OBJECT_P(type) \
 773   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 774
 775 #define C_TYPE_INCOMPLETE_P(type) \
 776   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 777
 778 #define C_TYPE_FUNCTION_P(type) \
 779   (TREE_CODE (type) == FUNCTION_TYPE)
 780
 781 /* For convenience we define a single macro to identify the class of
 782    object or incomplete types.  */
 783 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 784   (!C_TYPE_FUNCTION_P (type))
 785
 786 /* Return true if TYPE is a vector type that should be subject to the GNU
 787    vector extensions (as opposed to a vector type that is used only for
 788    the purposes of defining target-specific built-in functions).  */
 789
 790 inline bool
 791 gnu_vector_type_p (const_tree type)
 792 {
 793   return TREE_CODE (type) == VECTOR_TYPE && !TYPE_INDIVISIBLE_P (type);
 794 }
 795
 796 struct visibility_flags
 797 {
 798   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 799   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 800 };
 801
 802 /* These enumerators are possible types of unsafe conversions.  */
 803 enum conversion_safety {
 804   /* The conversion is safe.  */
 805   SAFE_CONVERSION = 0,
 806   /* Another type of conversion with problems.  */
 807   UNSAFE_OTHER,
 808   /* Conversion between signed and unsigned integers.  */
 809   UNSAFE_SIGN,
 810   /* Conversions that reduce the precision of reals including conversions
 811      from reals to integers.  */
 812   UNSAFE_REAL,
 813   /* Conversions from complex to reals or integers, that discard imaginary
 814      component.  */
 815   UNSAFE_IMAGINARY
 816 };
 817
 818 /* Global visibility options.  */
 819 extern struct visibility_flags visibility_options;
 820
 821 /* Attribute table common to the C front ends.  */
 822 extern const struct attribute_spec c_common_attribute_table[];
 823 extern const struct attribute_spec c_common_format_attribute_table[];
 824
 825 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 826    ID is the identifier to use, NAME is the string.
 827    TYPE_DEP indicates whether it depends on type of the function or not
 828    (i.e. __PRETTY_FUNCTION__).  */
 829
 830 extern tree (*make_fname_decl) (location_t, tree, int);
 831
 832 /* In c-decl.c and cp/tree.c.  FIXME.  */
 833 extern void c_register_addr_space (const char *str, addr_space_t as);
 834
 835 /* In c-common.c.  */
 836 extern bool in_late_binary_op;
 837 extern const char *c_addr_space_name (addr_space_t as);
 838 extern tree identifier_global_value (tree);
 839 extern tree identifier_global_tag (tree);
 840 extern bool names_builtin_p (const char *);
 841 extern tree c_linkage_bindings (tree);
 842 extern void record_builtin_type (enum rid, const char *, tree);
 843 extern tree build_void_list_node (void);
 844 extern void start_fname_decls (void);
 845 extern void finish_fname_decls (void);
 846 extern const char *fname_as_string (int);
 847 extern tree fname_decl (location_t, unsigned, tree);
 848
 849 extern int check_user_alignment (const_tree, bool, bool);
 850 extern bool check_function_arguments (location_t loc, const_tree, const_tree,
 851                                       int, tree *, vec<location_t> *);
 852 extern void check_function_arguments_recurse (void (*)
 853                                               (void *, tree,
 854                                                unsigned HOST_WIDE_INT),
 855                                               void *, tree,
 856                                               unsigned HOST_WIDE_INT);
 857 extern bool check_builtin_function_arguments (location_t, vec<location_t>,
 858                                               tree, tree, int, tree *);
 859 extern void check_function_format (const_tree, tree, int, tree *,
 860                                    vec<location_t> *);
 861 extern bool attribute_fallthrough_p (tree);
 862 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 863 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 864 extern bool c_common_handle_option (size_t, const char *, HOST_WIDE_INT, int,
 865                                     location_t,
 866                                     const struct cl_option_handlers *);
 867 extern bool default_handle_c_option (size_t, const char *, int);
 868 extern tree c_common_type_for_mode (machine_mode, int);
 869 extern tree c_common_type_for_size (unsigned int, int);
 870 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 871                                                 int, int);
 872 extern tree c_common_unsigned_type (tree);
 873 extern tree c_common_signed_type (tree);
 874 extern tree c_common_signed_or_unsigned_type (int, tree);
 875 extern void c_common_init_ts (void);
 876 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 877 extern enum conversion_safety unsafe_conversion_p (tree, tree, tree, bool);
 878 extern bool decl_with_nonnull_addr_p (const_tree);
 879 extern tree c_fully_fold (tree, bool, bool *, bool = false);
 880 extern tree c_wrap_maybe_const (tree, bool);
 881 extern tree c_common_truthvalue_conversion (location_t, tree);
 882 extern void c_apply_type_quals_to_decl (int, tree);
 883 extern tree c_sizeof_or_alignof_type (location_t, tree, bool, bool, int);
 884 extern tree c_alignof_expr (location_t, tree);
 885 /* Print an error message for invalid operands to arith operation CODE.
 886    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 887 extern void binary_op_error (rich_location *, enum tree_code, tree, tree);
 888 extern tree fix_string_type (tree);
 889 extern tree convert_and_check (location_t, tree, tree);
 890 extern bool c_determine_visibility (tree);
 891 extern bool vector_types_compatible_elements_p (tree, tree);
 892 extern void mark_valid_location_for_stdc_pragma (bool);
 893 extern bool valid_location_for_stdc_pragma_p (void);
 894 extern void set_float_const_decimal64 (void);
 895 extern void clear_float_const_decimal64 (void);
 896 extern bool float_const_decimal64_p (void);
 897
 898 extern bool keyword_begins_type_specifier (enum rid);
 899 extern bool keyword_is_storage_class_specifier (enum rid);
 900 extern bool keyword_is_type_qualifier (enum rid);
 901 extern bool keyword_is_decl_specifier (enum rid);
 902 extern unsigned max_align_t_align (void);
 903 extern bool cxx_fundamental_alignment_p (unsigned);
 904 extern bool pointer_to_zero_sized_aggr_p (tree);
 905 extern bool bool_promoted_to_int_p (tree);
 906 extern tree fold_for_warn (tree);
 907 extern tree c_common_get_narrower (tree, int *);
 908 extern bool get_attribute_operand (tree, unsigned HOST_WIDE_INT *);
 909 extern void c_common_finalize_early_debug (void);
 910
 911
 912 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, false, 1)
 913 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, false, 1)
 914
 915 /* Subroutine of build_binary_op, used for certain operations.  */
 916 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 917
 918 /* Subroutine of build_binary_op, used for comparison operations.
 919    See if the operands have both been converted from subword integer types
 920    and, if so, perhaps change them both back to their original type.  */
 921 extern tree shorten_compare (location_t, tree *, tree *, tree *,
 922                              enum tree_code *);
 923
 924 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree,
 925                              bool = true);
 926
 927 /* Add qualifiers to a type, in the fashion for C.  */
 928 extern tree c_build_qualified_type (tree, int, tree = NULL_TREE, size_t = 0);
 929
 930 /* Build tree nodes and builtin functions common to both C and C++ language
 931    frontends.  */
 932 extern void c_common_nodes_and_builtins (void);
 933
 934 extern void disable_builtin_function (const char *);
 935
 936 extern void set_compound_literal_name (tree decl);
 937
 938 extern tree build_va_arg (location_t, tree, tree);
 939
 940 extern const unsigned int c_family_lang_mask;
 941 extern unsigned int c_common_option_lang_mask (void);
 942 extern void c_common_diagnostics_set_defaults (diagnostic_context *);
 943 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 944 extern void c_common_init_options_struct (struct gcc_options *);
 945 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 946 extern bool c_common_post_options (const char **);
 947 extern bool c_common_init (void);
 948 extern void c_common_finish (void);
 949 extern void c_common_parse_file (void);
 950 extern FILE *get_dump_info (int, dump_flags_t *);
 951 extern alias_set_type c_common_get_alias_set (tree);
 952 extern void c_register_builtin_type (tree, const char*);
 953 extern bool c_promoting_integer_type_p (const_tree);
 954 extern bool self_promoting_args_p (const_tree);
 955 extern tree strip_pointer_operator (tree);
 956 extern tree strip_pointer_or_array_types (tree);
 957 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 958
 959 /* This is the basic parsing function.  */
 960 extern void c_parse_file (void);
 961
 962 extern void c_parse_final_cleanups (void);
 963
 964 /* These macros provide convenient access to the various _STMT nodes.  */
 965
 966 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 967    if a statement expression.  */
 968 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 969   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 970
 971 /* Nonzero if a label has been added to the statement list.  */
 972 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 973   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 974
 975 /* C_MAYBE_CONST_EXPR accessors.  */
 976 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
 977   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
 978 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
 979   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
 980 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
 981   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 982 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
 983   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 984 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
 985   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
 986    && (TREE_CODE (EXPR) == INTEGER_CST                  \
 987        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
 988            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
 989
 990 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 991 #define DECL_C_BIT_FIELD(NODE) \
 992   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 993 #define SET_DECL_C_BIT_FIELD(NODE) \
 994   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 995 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 996   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 997
 998 /* True if the decl was an unnamed bitfield.  */
 999 #define DECL_UNNAMED_BIT_FIELD(NODE) \
1000   (DECL_C_BIT_FIELD (NODE) && !DECL_NAME (NODE))
1001
1002 extern tree do_case (location_t, tree, tree);
1003 extern tree build_stmt (location_t, enum tree_code, ...);
1004 extern tree build_real_imag_expr (location_t, enum tree_code, tree);
1005
1006 /* These functions must be defined by each front-end which implements
1007    a variant of the C language.  They are used in c-common.c.  */
1008
1009 extern tree build_unary_op (location_t, enum tree_code, tree, bool);
1010 extern tree build_binary_op (location_t, enum tree_code, tree, tree, bool);
1011 extern tree perform_integral_promotions (tree);
1012
1013 /* These functions must be defined by each front-end which implements
1014    a variant of the C language.  They are used by port files.  */
1015
1016 extern tree default_conversion (tree);
1017
1018 /* Given two integer or real types, return the type for their sum.
1019    Given two compatible ANSI C types, returns the merged type.  */
1020
1021 extern tree common_type (tree, tree);
1022
1023 extern tree decl_constant_value (tree);
1024
1025 /* Handle increment and decrement of boolean types.  */
1026 extern tree boolean_increment (enum tree_code, tree);
1027
1028 extern int case_compare (splay_tree_key, splay_tree_key);
1029
1030 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree);
1031 extern bool c_switch_covers_all_cases_p (splay_tree, tree);
1032 extern bool c_block_may_fallthru (const_tree);
1033
1034 extern tree build_function_call (location_t, tree, tree);
1035
1036 extern tree build_function_call_vec (location_t, vec<location_t>, tree,
1037                                      vec<tree, va_gc> *, vec<tree, va_gc> *,
1038                                      tree = NULL_TREE);
1039
1040 extern tree resolve_overloaded_builtin (location_t, tree, vec<tree, va_gc> *);
1041
1042 extern tree finish_label_address_expr (tree, location_t);
1043
1044 /* Same function prototype, but the C and C++ front ends have
1045    different implementations.  Used in c-common.c.  */
1046 extern tree lookup_label (tree);
1047 extern tree lookup_name (tree);
1048 extern bool lvalue_p (const_tree);
1049
1050 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
1051 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
1052 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree, bool = true);
1053 extern tree c_build_shufflevector (location_t, tree, tree,
1054                                    const vec<tree> &, bool = true);
1055 extern tree c_build_vec_convert (location_t, tree, location_t, tree, bool = true);
1056
1057 extern void init_c_lex (void);
1058
1059 extern void c_cpp_builtins (cpp_reader *);
1060 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
1061 extern bool c_cpp_diagnostic (cpp_reader *, enum cpp_diagnostic_level,
1062                               enum cpp_warning_reason, rich_location *,
1063                               const char *, va_list *)
1064      ATTRIBUTE_GCC_DIAG(5,0);
1065 extern int c_common_has_attribute (cpp_reader *, bool);
1066 extern int c_common_has_builtin (cpp_reader *);
1067
1068 extern bool parse_optimize_options (tree, bool);
1069
1070 /* Positive if an implicit `extern "C"' scope has just been entered;
1071    negative if such a scope has just been exited.  */
1072 extern GTY(()) int pending_lang_change;
1073
1074 /* Information recorded about each file examined during compilation.  */
1075
1076 struct c_fileinfo
1077 {
1078   int time;     /* Time spent in the file.  */
1079
1080   /* Flags used only by C++.
1081      INTERFACE_ONLY nonzero means that we are in an "interface" section
1082      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
1083      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
1084      INTERFACE_ONLY is zero, it means that we are responsible for
1085      exporting definitions that others might need.  */
1086   short interface_only;
1087   short interface_unknown;
1088 };
1089
1090 struct c_fileinfo *get_fileinfo (const char *);
1091 extern void dump_time_statistics (void);
1092
1093 extern bool c_dump_tree (void *, tree);
1094
1095 extern void verify_sequence_points (tree);
1096
1097 extern tree fold_offsetof (tree, tree = size_type_node,
1098                            tree_code ctx = ERROR_MARK);
1099
1100 extern int complete_array_type (tree *, tree, bool);
1101 extern void complete_flexible_array_elts (tree);
1102
1103 extern tree builtin_type_for_size (int, bool);
1104
1105 extern void c_common_mark_addressable_vec (tree);
1106
1107 extern void set_underlying_type (tree);
1108 extern bool user_facing_original_type_p (const_tree);
1109 extern void record_types_used_by_current_var_decl (tree);
1110 extern vec<tree, va_gc> *make_tree_vector (void);
1111 extern void release_tree_vector (vec<tree, va_gc> *);
1112 extern vec<tree, va_gc> *make_tree_vector_single (tree);
1113 extern vec<tree, va_gc> *make_tree_vector_from_list (tree);
1114 extern vec<tree, va_gc> *make_tree_vector_from_ctor (tree);
1115 extern vec<tree, va_gc> *make_tree_vector_copy (const vec<tree, va_gc> *);
1116
1117 /* Used for communication between c_common_type_for_mode and
1118    c_register_builtin_type.  */
1119 extern GTY(()) tree registered_builtin_types;
1120
1121 /* Read SOURCE_DATE_EPOCH from environment to have a deterministic
1122    timestamp to replace embedded current dates to get reproducible
1123    results.  Returns -1 if SOURCE_DATE_EPOCH is not defined.  */
1124 extern time_t cb_get_source_date_epoch (cpp_reader *pfile);
1125
1126 /* The value (as a unix timestamp) corresponds to date
1127    "Dec 31 9999 23:59:59 UTC", which is the latest date that __DATE__ and
1128    __TIME__ can store.  */
1129 #define MAX_SOURCE_DATE_EPOCH HOST_WIDE_INT_C (253402300799)
1130
1131 /* Callback for libcpp for offering spelling suggestions for misspelled
1132    directives.  */
1133 extern const char *cb_get_suggestion (cpp_reader *, const char *,
1134                                       const char *const *);
1135
1136 extern GTY(()) string_concat_db *g_string_concat_db;
1137
1138 class substring_loc;
1139 extern const char *c_get_substring_location (const substring_loc &substr_loc,
1140                                              location_t *out_loc);
1141
1142 /* In c-gimplify.c.  */
1143 typedef struct bc_state
1144 {
1145   tree bc_label[2];
1146 } bc_state_t;
1147 extern void save_bc_state (bc_state_t *);
1148 extern void restore_bc_state (bc_state_t *);
1149 extern tree c_genericize_control_stmt (tree *, int *, void *,
1150                                        walk_tree_fn, walk_tree_lh);
1151 extern void c_genericize (tree);
1152 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1153 extern tree c_build_bind_expr (location_t, tree, tree);
1154
1155 /* In c-lex.c.  */
1156 extern enum cpp_ttype
1157 conflict_marker_get_final_tok_kind (enum cpp_ttype tok1_kind);
1158
1159 /* In c-pch.c  */
1160 extern void pch_init (void);
1161 extern void pch_cpp_save_state (void);
1162 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1163 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1164                                const char *orig);
1165 extern void c_common_write_pch (void);
1166 extern void c_common_no_more_pch (void);
1167 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1168
1169 /* In *-checksum.c */
1170 extern const unsigned char executable_checksum[16];
1171
1172 /* In c-cppbuiltin.c  */
1173 extern void builtin_define_std (const char *macro);
1174 extern void builtin_define_with_value (const char *, const char *, int);
1175 extern void builtin_define_with_int_value (const char *, HOST_WIDE_INT);
1176 extern void builtin_define_type_sizeof (const char *, tree);
1177 extern void c_stddef_cpp_builtins (void);
1178 extern void fe_file_change (const line_map_ordinary *);
1179 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char,
1180                            rich_location *richloc);
1181
1182 /* In c-ppoutput.c  */
1183 extern void init_pp_output (FILE *);
1184 extern void preprocess_file (cpp_reader *);
1185 extern void pp_file_change (const line_map_ordinary *);
1186 extern void pp_dir_change (cpp_reader *, const char *);
1187 extern bool check_missing_format_attribute (tree, tree);
1188
1189 /* In c-omp.c  */
1190 typedef wide_int_bitmask omp_clause_mask;
1191
1192 #define OMP_CLAUSE_MASK_1 omp_clause_mask (1)
1193
1194 enum c_omp_clause_split
1195 {
1196   C_OMP_CLAUSE_SPLIT_TARGET = 0,
1197   C_OMP_CLAUSE_SPLIT_TEAMS,
1198   C_OMP_CLAUSE_SPLIT_DISTRIBUTE,
1199   C_OMP_CLAUSE_SPLIT_PARALLEL,
1200   C_OMP_CLAUSE_SPLIT_FOR,
1201   C_OMP_CLAUSE_SPLIT_SIMD,
1202   C_OMP_CLAUSE_SPLIT_COUNT,
1203   C_OMP_CLAUSE_SPLIT_SECTIONS = C_OMP_CLAUSE_SPLIT_FOR,
1204   C_OMP_CLAUSE_SPLIT_TASKLOOP = C_OMP_CLAUSE_SPLIT_FOR,
1205   C_OMP_CLAUSE_SPLIT_LOOP = C_OMP_CLAUSE_SPLIT_FOR,
1206   C_OMP_CLAUSE_SPLIT_MASKED = C_OMP_CLAUSE_SPLIT_DISTRIBUTE
1207 };
1208
1209 enum c_omp_region_type
1210 {
1211   C_ORT_OMP                     = 1 << 0,
1212   C_ORT_ACC                     = 1 << 1,
1213   C_ORT_DECLARE_SIMD            = 1 << 2,
1214   C_ORT_TARGET                  = 1 << 3,
1215   C_ORT_OMP_DECLARE_SIMD        = C_ORT_OMP | C_ORT_DECLARE_SIMD,
1216   C_ORT_OMP_TARGET              = C_ORT_OMP | C_ORT_TARGET
1217 };
1218
1219 extern tree c_finish_omp_master (location_t, tree);
1220 extern tree c_finish_omp_masked (location_t, tree, tree);
1221 extern tree c_finish_omp_taskgroup (location_t, tree, tree);
1222 extern tree c_finish_omp_critical (location_t, tree, tree, tree);
1223 extern tree c_finish_omp_ordered (location_t, tree, tree);
1224 extern void c_finish_omp_barrier (location_t);
1225 extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
1226                                  tree, tree, tree, tree, tree, tree, bool,
1227                                  enum omp_memory_order, bool, bool = false);
1228 extern bool c_omp_depend_t_p (tree);
1229 extern void c_finish_omp_depobj (location_t, tree, enum omp_clause_depend_kind,
1230                                  tree);
1231 extern void c_finish_omp_flush (location_t, int);
1232 extern void c_finish_omp_taskwait (location_t);
1233 extern void c_finish_omp_taskyield (location_t);
1234 extern tree c_finish_omp_for (location_t, enum tree_code, tree, tree, tree,
1235                               tree, tree, tree, tree, bool);
1236 extern bool c_omp_check_loop_iv (tree, tree, walk_tree_lh);
1237 extern bool c_omp_check_loop_iv_exprs (location_t, tree, int, tree, tree, tree,
1238                                        walk_tree_lh);
1239 extern tree c_finish_oacc_wait (location_t, tree, tree);
1240 extern tree c_oacc_split_loop_clauses (tree, tree *, bool);
1241 extern void c_omp_split_clauses (location_t, enum tree_code, omp_clause_mask,
1242                                  tree, tree *);
1243 extern tree c_omp_declare_simd_clauses_to_numbers (tree, tree);
1244 extern void c_omp_declare_simd_clauses_to_decls (tree, tree);
1245 extern bool c_omp_predefined_variable (tree);
1246 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1247 extern enum omp_clause_defaultmap_kind c_omp_predetermined_mapping (tree);
1248 extern tree c_omp_check_context_selector (location_t, tree);
1249 extern void c_omp_mark_declare_variant (location_t, tree, tree);
1250 extern const char *c_omp_map_clause_name (tree, bool);
1251 extern void c_omp_adjust_map_clauses (tree, bool);
1252
1253 enum c_omp_directive_kind {
1254   C_OMP_DIR_STANDALONE,
1255   C_OMP_DIR_CONSTRUCT,
1256   C_OMP_DIR_DECLARATIVE,
1257   C_OMP_DIR_UTILITY,
1258   C_OMP_DIR_INFORMATIONAL
1259 };
1260
1261 struct c_omp_directive {
1262   const char *first, *second, *third;
1263   unsigned int id;
1264   enum c_omp_directive_kind kind;
1265   bool simd;
1266 };
1267
1268 extern const struct c_omp_directive *c_omp_categorize_directive (const char *,
1269                                                                  const char *,
1270                                                                  const char *);
1271
1272 /* Return next tree in the chain for chain_next walking of tree nodes.  */
1273 static inline tree
1274 c_tree_chain_next (tree t)
1275 {
1276   /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1277      kind of object, never a long chain of nodes.  Prefer
1278      TYPE_NEXT_VARIANT for types.  */
1279   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1280     return TYPE_NEXT_VARIANT (t);
1281   /* Otherwise, if there is TREE_CHAIN, return it.  */
1282   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1283     return TREE_CHAIN (t);
1284   return NULL;
1285 }
1286
1287 /* Mask used by tm_stmt_attr.  */
1288 #define TM_STMT_ATTR_OUTER      2
1289 #define TM_STMT_ATTR_ATOMIC     4
1290 #define TM_STMT_ATTR_RELAXED    8
1291
1292 /* Mask used by tm_attr_to_mask and tm_mask_to_attr.  Note that these
1293    are ordered specifically such that more restrictive attributes are
1294    at lower bit positions.  This fact is known by the C++ tm attribute
1295    inheritance code such that least bit extraction (mask & -mask) results
1296    in the most restrictive attribute.  */
1297 #define TM_ATTR_SAFE                    1
1298 #define TM_ATTR_CALLABLE                2
1299 #define TM_ATTR_PURE                    4
1300 #define TM_ATTR_IRREVOCABLE             8
1301 #define TM_ATTR_MAY_CANCEL_OUTER        16
1302
1303 /* A suffix-identifier value doublet that represents user-defined literals
1304    for C++-0x.  */
1305 enum overflow_type {
1306   OT_UNDERFLOW = -1,
1307   OT_NONE,
1308   OT_OVERFLOW
1309 };
1310
1311 struct GTY(()) tree_userdef_literal {
1312   struct tree_base base;
1313   tree suffix_id;
1314   tree value;
1315   tree num_string;
1316   enum overflow_type overflow;
1317 };
1318
1319 #define USERDEF_LITERAL_SUFFIX_ID(NODE) \
1320   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->suffix_id)
1321
1322 #define USERDEF_LITERAL_VALUE(NODE) \
1323   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->value)
1324
1325 #define USERDEF_LITERAL_OVERFLOW(NODE) \
1326   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->overflow)
1327
1328 #define USERDEF_LITERAL_NUM_STRING(NODE) \
1329   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->num_string)
1330
1331 #define USERDEF_LITERAL_TYPE(NODE) \
1332   (TREE_TYPE (USERDEF_LITERAL_VALUE (NODE)))
1333
1334 extern tree build_userdef_literal (tree suffix_id, tree value,
1335                                    enum overflow_type overflow,
1336                                    tree num_string);
1337
1338
1339 /* WHILE_STMT accessors. These give access to the condition of the
1340    while statement and the body of the while statement, respectively.  */
1341 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
1342 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
1343
1344 /* DO_STMT accessors. These give access to the condition of the do
1345    statement and the body of the do statement, respectively.  */
1346 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
1347 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
1348
1349 /* FOR_STMT accessors. These give access to the init statement,
1350    condition, update expression, and body of the for statement,
1351    respectively.  */
1352 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
1353 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
1354 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
1355 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
1356 #define FOR_SCOPE(NODE)         TREE_OPERAND (FOR_STMT_CHECK (NODE), 4)
1357
1358 #define SWITCH_STMT_COND(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
1359 #define SWITCH_STMT_BODY(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
1360 #define SWITCH_STMT_TYPE(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
1361 #define SWITCH_STMT_SCOPE(NODE) TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 3)
1362 /* True if there are case labels for all possible values of switch cond, either
1363    because there is a default: case label or because the case label ranges cover
1364    all values.  */
1365 #define SWITCH_STMT_ALL_CASES_P(NODE) \
1366   TREE_LANG_FLAG_0 (SWITCH_STMT_CHECK (NODE))
1367 /* True if the body of a switch stmt contains no BREAK_STMTs.  */
1368 #define SWITCH_STMT_NO_BREAK_P(NODE) \
1369   TREE_LANG_FLAG_2 (SWITCH_STMT_CHECK (NODE))
1370
1371
1372 /* Nonzero if NODE is the target for genericization of 'break' stmts.  */
1373 #define LABEL_DECL_BREAK(NODE) \
1374   DECL_LANG_FLAG_0 (LABEL_DECL_CHECK (NODE))
1375
1376 /* Nonzero if NODE is the target for genericization of 'continue' stmts.  */
1377 #define LABEL_DECL_CONTINUE(NODE) \
1378   DECL_LANG_FLAG_1 (LABEL_DECL_CHECK (NODE))
1379
1380 extern bool convert_vector_to_array_for_subscript (location_t, tree *, tree);
1381
1382 /* Possibe cases of scalar_to_vector conversion.  */
1383 enum stv_conv {
1384   stv_error,        /* Error occurred.  */
1385   stv_nothing,      /* Nothing happened.  */
1386   stv_firstarg,     /* First argument must be expanded.  */
1387   stv_secondarg     /* Second argument must be expanded.  */
1388 };
1389
1390 extern enum stv_conv scalar_to_vector (location_t loc, enum tree_code code,
1391                                        tree op0, tree op1, bool);
1392
1393 extern tree find_inv_trees (tree *, int *, void *);
1394 extern tree replace_inv_trees (tree *, int *, void *);
1395
1396 extern bool reject_gcc_builtin (const_tree, location_t = UNKNOWN_LOCATION);
1397 extern bool valid_array_size_p (location_t, const_tree, tree, bool = true);
1398 extern void invalid_array_size_error (location_t, cst_size_error,
1399                                       const_tree, const_tree);
1400
1401 /* In c-warn.c.  */
1402 extern void constant_expression_warning (tree);
1403 extern void constant_expression_error (tree);
1404 extern void overflow_warning (location_t, tree, tree = NULL_TREE);
1405 extern void warn_logical_operator (location_t, enum tree_code, tree,
1406                                    enum tree_code, tree, enum tree_code, tree);
1407 extern void warn_tautological_cmp (const op_location_t &, enum tree_code,
1408                                    tree, tree);
1409 extern void warn_logical_not_parentheses (location_t, enum tree_code, tree,
1410                                           tree);
1411 extern bool warn_if_unused_value (const_tree, location_t, bool = false);
1412 extern bool strict_aliasing_warning (location_t, tree, tree);
1413 extern void sizeof_pointer_memaccess_warning (location_t *, tree,
1414                                               vec<tree, va_gc> *, tree *,
1415                                               bool (*) (tree, tree));
1416 extern void check_main_parameter_types (tree decl);
1417 extern void warnings_for_convert_and_check (location_t, tree, tree, tree);
1418 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree, bool);
1419 extern void warn_for_omitted_condop (location_t, tree);
1420 extern bool warn_for_restrict (unsigned, tree *, unsigned);
1421 extern void warn_for_address_or_pointer_of_packed_member (tree, tree);
1422 extern void warn_parm_array_mismatch (location_t, tree, tree);
1423 extern void maybe_warn_sizeof_array_div (location_t, tree, tree, tree, tree);
1424 extern void do_warn_array_compare (location_t, tree_code, tree, tree);
1425
1426 /* Places where an lvalue, or modifiable lvalue, may be required.
1427    Used to select diagnostic messages in lvalue_error and
1428    readonly_error.  */
1429 enum lvalue_use {
1430   lv_assign,
1431   lv_increment,
1432   lv_decrement,
1433   lv_addressof,
1434   lv_asm
1435 };
1436
1437 extern void lvalue_error (location_t, enum lvalue_use);
1438 extern void invalid_indirection_error (location_t, tree, ref_operator);
1439 extern void readonly_error (location_t, tree, enum lvalue_use);
1440 extern void warn_array_subscript_with_type_char (location_t, tree);
1441 extern void warn_about_parentheses (location_t,
1442                                     enum tree_code,
1443                                     enum tree_code, tree,
1444                                     enum tree_code, tree);
1445 extern void warn_for_unused_label (tree label);
1446 extern void warn_for_div_by_zero (location_t, tree divisor);
1447 extern void warn_for_memset (location_t, tree, tree, int);
1448 extern void warn_for_sign_compare (location_t,
1449                                    tree orig_op0, tree orig_op1,
1450                                    tree op0, tree op1,
1451                                    tree result_type,
1452                                    enum tree_code resultcode);
1453 extern void do_warn_double_promotion (tree, tree, tree, const char *,
1454                                       location_t);
1455 extern void do_warn_unused_parameter (tree);
1456 extern void record_locally_defined_typedef (tree);
1457 extern void maybe_record_typedef_use (tree);
1458 extern void maybe_warn_unused_local_typedefs (void);
1459 extern void maybe_warn_bool_compare (location_t, enum tree_code, tree, tree);
1460 extern bool maybe_warn_shift_overflow (location_t, tree, tree);
1461 extern void warn_duplicated_cond_add_or_warn (location_t, tree, vec<tree> **);
1462 extern bool diagnose_mismatched_attributes (tree, tree);
1463 extern tree do_warn_duplicated_branches_r (tree *, int *, void *);
1464 extern void warn_for_multistatement_macros (location_t, location_t,
1465                                             location_t, enum rid);
1466
1467 /* In c-attribs.c.  */
1468 extern bool attribute_takes_identifier_p (const_tree);
1469 extern tree handle_deprecated_attribute (tree *, tree, tree, int, bool *);
1470 extern tree handle_unused_attribute (tree *, tree, tree, int, bool *);
1471 extern tree handle_fallthrough_attribute (tree *, tree, tree, int, bool *);
1472 extern int parse_tm_stmt_attr (tree, int);
1473 extern int tm_attr_to_mask (tree);
1474 extern tree tm_mask_to_attr (int);
1475 extern tree find_tm_attribute (tree);
1476 extern const struct attribute_spec::exclusions attr_cold_hot_exclusions[];
1477 extern const struct attribute_spec::exclusions attr_noreturn_exclusions[];
1478 extern tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
1479 extern bool has_attribute (location_t, tree, tree, tree (*)(tree));
1480 extern tree build_attr_access_from_parms (tree, bool);
1481
1482 /* In c-format.c.  */
1483 extern bool valid_format_string_type_p (tree);
1484
1485 /* A bitmap of flags to positional_argument.  */
1486 enum posargflags {
1487   /* Consider positional attribute argument value zero valid.  */
1488   POSARG_ZERO = 1,
1489   /* Consider positional attribute argument value valid if it refers
1490      to the ellipsis (i.e., beyond the last typed argument).  */
1491   POSARG_ELLIPSIS = 2
1492 };
1493
1494 extern tree positional_argument (const_tree, const_tree, tree, tree_code,
1495                                  int = 0, int = posargflags ());
1496
1497 extern enum flt_eval_method
1498 excess_precision_mode_join (enum flt_eval_method, enum flt_eval_method);
1499
1500 extern int c_flt_eval_method (bool ts18661_p);
1501 extern void add_no_sanitize_value (tree node, unsigned int flags);
1502
1503 extern void maybe_add_include_fixit (rich_location *, const char *, bool);
1504 extern void maybe_suggest_missing_token_insertion (rich_location *richloc,
1505                                                    enum cpp_ttype token_type,
1506                                                    location_t prev_token_loc);
1507 extern tree braced_lists_to_strings (tree, tree);
1508
1509 #if CHECKING_P
1510 namespace selftest {
1511   /* Declarations for specific families of tests within c-family,
1512      by source file, in alphabetical order.  */
1513   extern void c_format_c_tests (void);
1514   extern void c_indentation_c_tests (void);
1515   extern void c_pretty_print_c_tests (void);
1516   extern void c_spellcheck_cc_tests (void);
1517
1518   /* The entrypoint for running all of the above tests.  */
1519   extern void c_family_tests (void);
1520 } // namespace selftest
1521 #endif /* #if CHECKING_P */
1522
1523 #endif /* ! GCC_C_COMMON_H */