gcc/c-family/c-common.h

   1 /* Definitions for c-common.cc.
   2    Copyright (C) 1987-2023 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_TYPEOF_UNQUAL, RID_ALIGNOF,  RID_ATTRIBUTE,
 108   RID_VA_ARG,
 109   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
 110   RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,          RID_BUILTIN_SHUFFLE,
 111   RID_BUILTIN_SHUFFLEVECTOR,   RID_BUILTIN_CONVERTVECTOR,   RID_BUILTIN_TGMATH,
 112   RID_BUILTIN_HAS_ATTRIBUTE,   RID_BUILTIN_ASSOC_BARRIER,
 113   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
 114
 115   /* TS 18661-3 keywords, in the same sequence as the TI_* values.  */
 116   RID_FLOAT16,
 117   RID_FLOATN_NX_FIRST = RID_FLOAT16,
 118   RID_FLOAT32,
 119   RID_FLOAT64,
 120   RID_FLOAT128,
 121   RID_FLOAT32X,
 122   RID_FLOAT64X,
 123   RID_FLOAT128X,
 124 #define CASE_RID_FLOATN_NX                                              \
 125   case RID_FLOAT16: case RID_FLOAT32: case RID_FLOAT64: case RID_FLOAT128: \
 126   case RID_FLOAT32X: case RID_FLOAT64X: case RID_FLOAT128X
 127
 128   RID_FRACT, RID_ACCUM, RID_AUTO_TYPE, RID_BUILTIN_CALL_WITH_STATIC_CHAIN,
 129
 130   /* "__GIMPLE", for the GIMPLE-parsing extension to the C frontend. */
 131   RID_GIMPLE,
 132
 133   /* "__PHI", for parsing PHI function in GIMPLE FE.  */
 134   RID_PHI,
 135
 136   /* "__RTL", for the RTL-parsing extension to the C frontend.  */
 137   RID_RTL,
 138
 139   /* C11 */
 140   RID_ALIGNAS, RID_GENERIC,
 141
 142   /* This means to warn that this is a C++ keyword, and then treat it
 143      as a normal identifier.  */
 144   RID_CXX_COMPAT_WARN,
 145
 146   /* GNU transactional memory extension */
 147   RID_TRANSACTION_ATOMIC, RID_TRANSACTION_RELAXED, RID_TRANSACTION_CANCEL,
 148
 149   /* Too many ways of getting the name of a function as a string */
 150   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
 151
 152   /* C++ (some of these are keywords in Objective-C as well, but only
 153      if they appear after a '@') */
 154   RID_BOOL,     RID_WCHAR,    RID_CLASS,
 155   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
 156   RID_TEMPLATE, RID_NULL,     RID_CATCH,
 157   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
 158   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
 159   RID_THIS,     RID_THROW,    RID_TRUE,
 160   RID_TRY,      RID_TYPENAME, RID_TYPEID,
 161   RID_USING,    RID_CHAR16,   RID_CHAR32,
 162
 163   /* casts */
 164   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
 165
 166   /* C++ extensions */
 167   RID_ADDRESSOF,
 168   RID_BUILTIN_LAUNDER,
 169   RID_BUILTIN_BIT_CAST,
 170
 171 #define DEFTRAIT(TCC, CODE, NAME, ARITY) \
 172   RID_##CODE,
 173 #include "cp/cp-trait.def"
 174 #undef DEFTRAIT
 175
 176   /* C++11 */
 177   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 178
 179   /* C++20 */
 180   RID_CONSTINIT, RID_CONSTEVAL,
 181
 182   /* char8_t */
 183   RID_CHAR8,
 184
 185   /* C++ concepts */
 186   RID_CONCEPT, RID_REQUIRES,
 187
 188   /* C++ modules.  */
 189   RID__MODULE, RID__IMPORT, RID__EXPORT, /* Internal tokens.  */
 190
 191   /* C++ coroutines */
 192   RID_CO_AWAIT, RID_CO_YIELD, RID_CO_RETURN,
 193
 194   /* C++ transactional memory.  */
 195   RID_ATOMIC_NOEXCEPT, RID_ATOMIC_CANCEL, RID_SYNCHRONIZED,
 196
 197   /* Objective-C ("AT" reserved words - they are only keywords when
 198      they follow '@')  */
 199   RID_AT_ENCODE,   RID_AT_END,
 200   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 201   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 202   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 203   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 204   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 205   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 206   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 207   RID_AT_INTERFACE,
 208   RID_AT_IMPLEMENTATION,
 209
 210   /* OpenMP */
 211   RID_OMP_ALL_MEMORY,
 212
 213   /* Named address support, mapping the keyword to a particular named address
 214      number.  Named address space 0 is reserved for the generic address.  If
 215      there are more than 254 named addresses, the addr_space_t type will need
 216      to be grown from an unsigned char to unsigned short.  */
 217   RID_ADDR_SPACE_0,             /* generic address */
 218   RID_ADDR_SPACE_1,
 219   RID_ADDR_SPACE_2,
 220   RID_ADDR_SPACE_3,
 221   RID_ADDR_SPACE_4,
 222   RID_ADDR_SPACE_5,
 223   RID_ADDR_SPACE_6,
 224   RID_ADDR_SPACE_7,
 225   RID_ADDR_SPACE_8,
 226   RID_ADDR_SPACE_9,
 227   RID_ADDR_SPACE_10,
 228   RID_ADDR_SPACE_11,
 229   RID_ADDR_SPACE_12,
 230   RID_ADDR_SPACE_13,
 231   RID_ADDR_SPACE_14,
 232   RID_ADDR_SPACE_15,
 233
 234   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 235   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 236
 237   /* __intN keywords.  The _N_M here doesn't correspond to the intN
 238      in the keyword; use the bitsize in int_n_t_data_t[M] for that.
 239      For example, if int_n_t_data_t[0].bitsize is 13, then RID_INT_N_0
 240      is for __int13.  */
 241
 242   /* Note that the range to use is RID_FIRST_INT_N through
 243      RID_FIRST_INT_N + NUM_INT_N_ENTS - 1 and c-parser.cc has a list of
 244      all RID_INT_N_* in a case statement.  */
 245
 246   RID_INT_N_0,
 247   RID_INT_N_1,
 248   RID_INT_N_2,
 249   RID_INT_N_3,
 250
 251   RID_FIRST_INT_N = RID_INT_N_0,
 252   RID_LAST_INT_N = RID_INT_N_3,
 253
 254   RID_MAX,
 255
 256   RID_FIRST_MODIFIER = RID_STATIC,
 257   RID_LAST_MODIFIER = RID_ONEWAY,
 258
 259   RID_FIRST_CXX11 = RID_CONSTEXPR,
 260   RID_LAST_CXX11 = RID_STATIC_ASSERT,
 261   RID_FIRST_CXX20 = RID_CONSTINIT,
 262   RID_LAST_CXX20 = RID_CO_RETURN,
 263   RID_FIRST_AT = RID_AT_ENCODE,
 264   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 265   RID_FIRST_PQ = RID_IN,
 266   RID_LAST_PQ = RID_ONEWAY,
 267   RID_FIRST_PATTR = RID_GETTER,
 268   RID_LAST_PATTR = RID_NULL_RESETTABLE
 269 };
 270
 271 #define OBJC_IS_AT_KEYWORD(rid) \
 272   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 273    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 274
 275 #define OBJC_IS_PQ_KEYWORD(rid) \
 276   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 277    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 278
 279 /* Keywords permitted in an @property attribute context.  */
 280 #define OBJC_IS_PATTR_KEYWORD(rid) \
 281   ((((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 282      (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)) \
 283    || rid == RID_CLASS)
 284
 285 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 286    'class') which are shared in a subtle way between Objective-C and
 287    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 288    finds '@' followed by one of these identifiers (eg, '@class'), it
 289    recognizes the whole as an Objective-C keyword.  If the identifier
 290    is found elsewhere, it follows the rules of the C/C++ language.
 291  */
 292 #define OBJC_IS_CXX_KEYWORD(rid) \
 293   (rid == RID_CLASS || rid == RID_SYNCHRONIZED                  \
 294    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 295    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 296
 297 /* The elements of `ridpointers' are identifier nodes for the reserved
 298    type names and storage classes.  It is indexed by a RID_... value.  */
 299 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 300
 301 /* Standard named or nameless data types of the C compiler.  */
 302
 303 enum c_tree_index
 304 {
 305     CTI_CHAR8_TYPE,
 306     CTI_CHAR16_TYPE,
 307     CTI_CHAR32_TYPE,
 308     CTI_WCHAR_TYPE,
 309     CTI_UNDERLYING_WCHAR_TYPE,
 310     CTI_WINT_TYPE,
 311     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 312     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 313     CTI_INTMAX_TYPE,
 314     CTI_UINTMAX_TYPE,
 315     CTI_WIDEST_INT_LIT_TYPE,
 316     CTI_WIDEST_UINT_LIT_TYPE,
 317
 318     /* Types for <stdint.h>, that may not be defined on all
 319        targets.  */
 320     CTI_SIG_ATOMIC_TYPE,
 321     CTI_INT8_TYPE,
 322     CTI_INT16_TYPE,
 323     CTI_INT32_TYPE,
 324     CTI_INT64_TYPE,
 325     CTI_UINT8_TYPE,
 326     CTI_UINT16_TYPE,
 327     CTI_UINT32_TYPE,
 328     CTI_UINT64_TYPE,
 329     CTI_INT_LEAST8_TYPE,
 330     CTI_INT_LEAST16_TYPE,
 331     CTI_INT_LEAST32_TYPE,
 332     CTI_INT_LEAST64_TYPE,
 333     CTI_UINT_LEAST8_TYPE,
 334     CTI_UINT_LEAST16_TYPE,
 335     CTI_UINT_LEAST32_TYPE,
 336     CTI_UINT_LEAST64_TYPE,
 337     CTI_INT_FAST8_TYPE,
 338     CTI_INT_FAST16_TYPE,
 339     CTI_INT_FAST32_TYPE,
 340     CTI_INT_FAST64_TYPE,
 341     CTI_UINT_FAST8_TYPE,
 342     CTI_UINT_FAST16_TYPE,
 343     CTI_UINT_FAST32_TYPE,
 344     CTI_UINT_FAST64_TYPE,
 345     CTI_INTPTR_TYPE,
 346     CTI_UINTPTR_TYPE,
 347
 348     CTI_CHAR_ARRAY_TYPE,
 349     CTI_CHAR8_ARRAY_TYPE,
 350     CTI_CHAR16_ARRAY_TYPE,
 351     CTI_CHAR32_ARRAY_TYPE,
 352     CTI_WCHAR_ARRAY_TYPE,
 353     CTI_STRING_TYPE,
 354     CTI_CONST_STRING_TYPE,
 355
 356     /* Type for boolean expressions (bool in C++, int in C).  */
 357     CTI_TRUTHVALUE_TYPE,
 358     CTI_TRUTHVALUE_TRUE,
 359     CTI_TRUTHVALUE_FALSE,
 360
 361     CTI_DEFAULT_FUNCTION_TYPE,
 362
 363     CTI_NULL,
 364     CTI_NULLPTR,
 365     CTI_NULLPTR_TYPE,
 366
 367     /* These are not types, but we have to look them up all the time.  */
 368     CTI_FUNCTION_NAME_DECL,
 369     CTI_PRETTY_FUNCTION_NAME_DECL,
 370     CTI_C99_FUNCTION_NAME_DECL,
 371
 372     CTI_MODULE_HWM,
 373     /* Below here entities change during compilation.  */
 374
 375     CTI_SAVED_FUNCTION_NAME_DECLS,
 376
 377     CTI_MAX
 378 };
 379
 380 #define C_CPP_HASHNODE(id) \
 381   (&(((struct c_common_identifier *) (id))->node))
 382 #define C_RID_CODE(id) \
 383   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 384 #define C_SET_RID_CODE(id, code) \
 385   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 386
 387 /* Identifier part common to the C front ends.  Inherits from
 388    tree_identifier, despite appearances.  */
 389 struct GTY(()) c_common_identifier {
 390   struct tree_common common;
 391   struct cpp_hashnode node;
 392 };
 393
 394 /* An entry in the reserved keyword table.  */
 395
 396 struct c_common_resword
 397 {
 398   const char *const word;
 399   ENUM_BITFIELD(rid) const rid : 16;
 400   const unsigned int disable   : 32;
 401 };
 402
 403 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 404
 405 extern machine_mode c_default_pointer_mode;
 406
 407 /* Extra cpp_ttype values for C++.  */
 408
 409 /* A token type for template-ids.  If a template-id is processed while
 410    parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
 411    the value of the CPP_TEMPLATE_ID is whatever was returned by
 412    cp_parser_template_id.  */
 413 #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
 414
 415 /* A token type for nested-name-specifiers.  If a
 416    nested-name-specifier is processed while parsing tentatively, it is
 417    replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
 418    CPP_NESTED_NAME_SPECIFIER is whatever was returned by
 419    cp_parser_nested_name_specifier_opt.  */
 420 #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
 421
 422 /* A token type for pre-parsed C++0x decltype.  */
 423 #define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
 424
 425 /* A token type for pre-parsed primary-expression (lambda- or statement-).  */
 426 #define CPP_PREPARSED_EXPR ((enum cpp_ttype) (CPP_DECLTYPE + 1))
 427
 428 /* The number of token types, including C++-specific ones.  */
 429 #define N_CP_TTYPES ((int) (CPP_PREPARSED_EXPR + 1))
 430
 431 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 432    mask) is _true_.  Thus for keywords which are present in all
 433    languages the disable field is zero.  */
 434
 435 #define D_CONLY         0x0001  /* C only (not in C++).  */
 436 #define D_CXXONLY       0x0002  /* C++ only (not in C).  */
 437 #define D_C99           0x0004  /* In C, C99 only.  */
 438 #define D_C2X           0x0008  /* In C, C2X only.  */
 439 #define D_CXX11         0x0010  /* In C++, C++11 only.  */
 440 #define D_EXT           0x0020  /* GCC extension.  */
 441 #define D_EXT89         0x0040  /* GCC extension incorporated in C99.  */
 442 #define D_EXT11         0x0080  /* GCC extension incorporated in C2X.  */
 443 #define D_ASM           0x0100  /* Disabled by -fno-asm.  */
 444 #define D_OBJC          0x0200  /* In Objective C and neither C nor C++.  */
 445 #define D_CXX_OBJC      0x0400  /* In Objective C, and C++, but not C.  */
 446 #define D_CXXWARN       0x0800  /* In C warn with -Wcxx-compat.  */
 447 #define D_CXX_CONCEPTS  0x1000  /* In C++, only with concepts.  */
 448 #define D_TRANSMEM      0x2000  /* C++ transactional memory TS.  */
 449 #define D_CXX_CHAR8_T   0x4000  /* In C++, only with -fchar8_t.  */
 450 #define D_CXX20         0x8000  /* In C++, C++20 only.  */
 451 #define D_CXX_COROUTINES 0x10000  /* In C++, only with coroutines.  */
 452 #define D_CXX_MODULES   0x20000  /* In C++, only with modules.  */
 453
 454 #define D_CXX_CONCEPTS_FLAGS D_CXXONLY | D_CXX_CONCEPTS
 455 #define D_CXX_CHAR8_T_FLAGS D_CXXONLY | D_CXX_CHAR8_T
 456 #define D_CXX_MODULES_FLAGS (D_CXXONLY | D_CXX_MODULES)
 457 #define D_CXX_COROUTINES_FLAGS (D_CXXONLY | D_CXX_COROUTINES)
 458
 459 /* The reserved keyword table.  */
 460 extern const struct c_common_resword c_common_reswords[];
 461
 462 /* The number of items in the reserved keyword table.  */
 463 extern const unsigned int num_c_common_reswords;
 464
 465 #define char8_type_node                 c_global_trees[CTI_CHAR8_TYPE]
 466 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 467 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 468 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 469 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 470 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 471 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 472 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 473 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 474 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 475 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 476 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 477
 478 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 479 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 480 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 481 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 482 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 483 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 484 #define c_uint16_type_node              c_global_trees[CTI_UINT16_TYPE]
 485 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 486 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 487 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 488 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 489 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 490 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 491 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 492 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 493 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 494 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 495 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 496 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 497 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 498 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 499 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 500 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 501 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 502 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 503 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 504 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 505
 506 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 507 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 508 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 509
 510 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 511 #define char8_array_type_node           c_global_trees[CTI_CHAR8_ARRAY_TYPE]
 512 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 513 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 514 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 515 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 516 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 517
 518 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 519
 520 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 521 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 522 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 523 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 524
 525 /* The node for C++ `__null'.  */
 526 #define null_node                       c_global_trees[CTI_NULL]
 527 /* The nodes for `nullptr'.  */
 528 #define nullptr_node                    c_global_trees[CTI_NULLPTR]
 529 #define nullptr_type_node               c_global_trees[CTI_NULLPTR_TYPE]
 530
 531 extern GTY(()) tree c_global_trees[CTI_MAX];
 532
 533 /* Mark which labels are explicitly declared.
 534    These may be shadowed, and may be referenced from nested functions.  */
 535 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 536
 537 enum c_language_kind
 538 {
 539   clk_c         = 0,            /* C90, C94, C99, C11 or C2X */
 540   clk_objc      = 1,            /* clk_c with ObjC features.  */
 541   clk_cxx       = 2,            /* ANSI/ISO C++ */
 542   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 543 };
 544
 545 /* To test for a specific language use c_language, defined by each
 546    front end.  For "ObjC features" or "not C++" use the macros.  */
 547 extern c_language_kind c_language;
 548
 549 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 550 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 551
 552 /* The various name of operator that appears in error messages. */
 553 enum ref_operator {
 554   /* NULL */
 555   RO_NULL,
 556   /* array indexing */
 557   RO_ARRAY_INDEXING,
 558   /* unary * */
 559   RO_UNARY_STAR,
 560   /* -> */
 561   RO_ARROW,
 562   /* implicit conversion */
 563   RO_IMPLICIT_CONVERSION,
 564   /* ->* */
 565   RO_ARROW_STAR
 566 };
 567
 568 /* Information about a statement tree.  */
 569
 570 struct GTY(()) stmt_tree_s {
 571   /* A stack of statement lists being collected.  */
 572   vec<tree, va_gc> *x_cur_stmt_list;
 573
 574   /* In C++, Nonzero if we should treat statements as full
 575      expressions.  In particular, this variable is non-zero if at the
 576      end of a statement we should destroy any temporaries created
 577      during that statement.  Similarly, if, at the end of a block, we
 578      should destroy any local variables in this block.  Normally, this
 579      variable is nonzero, since those are the normal semantics of
 580      C++.
 581
 582      This flag has no effect in C.  */
 583   int stmts_are_full_exprs_p;
 584 };
 585
 586 typedef struct stmt_tree_s *stmt_tree;
 587
 588 /* Global state pertinent to the current function.  Some C dialects
 589    extend this structure with additional fields.  */
 590
 591 struct GTY(()) c_language_function {
 592   /* While we are parsing the function, this contains information
 593      about the statement-tree that we are building.  */
 594   struct stmt_tree_s x_stmt_tree;
 595
 596   /* Vector of locally defined typedefs, for
 597      -Wunused-local-typedefs.  */
 598   vec<tree, va_gc> *local_typedefs;
 599 };
 600
 601 #define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
 602
 603 /* When building a statement-tree, this is the current statement list
 604    being collected.  */
 605 #define cur_stmt_list   (stmt_list_stack->last ())
 606
 607 #define building_stmt_list_p() (stmt_list_stack && !stmt_list_stack->is_empty())
 608
 609 /* Language-specific hooks.  */
 610
 611 /* If non-NULL, this function is called after a precompile header file
 612    is loaded.  */
 613 extern void (*lang_post_pch_load) (void);
 614
 615 extern void push_file_scope (void);
 616 extern void pop_file_scope (void);
 617 extern stmt_tree current_stmt_tree (void);
 618 extern tree push_stmt_list (void);
 619 extern tree pop_stmt_list (tree);
 620 extern tree add_stmt (tree);
 621 extern void push_cleanup (tree, tree, bool);
 622
 623 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 624                                location_t, tree, tree);
 625 extern tree build_indirect_ref (location_t, tree, ref_operator);
 626
 627 extern bool has_c_linkage (const_tree decl);
 628 extern bool c_decl_implicit (const_tree);
 629 \f
 630 /* Switches common to the C front ends.  */
 631
 632 /* Nonzero means don't output line number information.  */
 633
 634 extern char flag_no_line_commands;
 635
 636 /* Nonzero causes -E output not to be done, but directives such as
 637    #define that have side effects are still obeyed.  */
 638
 639 extern char flag_no_output;
 640
 641 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 642    'N' or 'U' of the command line switch.  */
 643
 644 extern char flag_dump_macros;
 645
 646 /* Nonzero means pass #include lines through to the output.  */
 647
 648 extern char flag_dump_includes;
 649
 650 /* Nonzero means process PCH files while preprocessing.  */
 651
 652 extern bool flag_pch_preprocess;
 653
 654 /* The file name to which we should write a precompiled header, or
 655    NULL if no header will be written in this compile.  */
 656
 657 extern const char *pch_file;
 658
 659 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 660    user's namespace.  */
 661
 662 extern int flag_iso;
 663
 664 /* C/ObjC language option variables.  */
 665
 666
 667 /* Nonzero means allow type mismatches in conditional expressions;
 668    just make their values `void'.  */
 669
 670 extern int flag_cond_mismatch;
 671
 672 /* Nonzero means enable C89 Amendment 1 features.  */
 673
 674 extern int flag_isoc94;
 675
 676 /* Nonzero means use the ISO C99 (or later) dialect of C.  */
 677
 678 extern int flag_isoc99;
 679
 680 /* Nonzero means use the ISO C11 (or later) dialect of C.  */
 681
 682 extern int flag_isoc11;
 683
 684 /* Nonzero means use the ISO C2X dialect of C.  */
 685
 686 extern int flag_isoc2x;
 687
 688 /* Nonzero means that we have builtin functions, and main is an int.  */
 689
 690 extern int flag_hosted;
 691
 692 /* ObjC language option variables.  */
 693
 694
 695 /* Tells the compiler that this is a special run.  Do not perform any
 696    compiling, instead we are to test some platform dependent features
 697    and output a C header file with appropriate definitions.  */
 698
 699 extern int print_struct_values;
 700
 701 /* Tells the compiler what is the constant string class for ObjC.  */
 702
 703 extern const char *constant_string_class_name;
 704
 705
 706 /* C++ language option variables.  */
 707
 708 /* The reference version of the ABI for -Wabi.  */
 709
 710 extern int warn_abi_version;
 711
 712 /* Return TRUE if one of {flag_abi_version,flag_abi_compat_version} is
 713    less than N and the other is at least N.  */
 714 #define abi_compat_version_crosses(N)           \
 715   (abi_version_at_least(N)                      \
 716    != (flag_abi_compat_version == 0             \
 717        || flag_abi_compat_version >= (N)))
 718
 719 /* Return TRUE if one of {flag_abi_version,warn_abi_version} is
 720    less than N and the other is at least N, for use by -Wabi.  */
 721 #define abi_version_crosses(N)                  \
 722   (abi_version_at_least(N)                      \
 723    != (warn_abi_version == 0                    \
 724        || warn_abi_version >= (N)))
 725
 726 /* The supported C++ dialects.  */
 727
 728 enum cxx_dialect {
 729   cxx_unset,
 730   /* C++98 with TC1  */
 731   cxx98,
 732   cxx03 = cxx98,
 733   /* C++11  */
 734   cxx0x,
 735   cxx11 = cxx0x,
 736   /* C++14 */
 737   cxx14,
 738   /* C++17 */
 739   cxx17,
 740   /* C++20 */
 741   cxx20,
 742   /* C++23 */
 743   cxx23
 744 };
 745
 746 /* The C++ dialect being used. C++98 is the default.  */
 747 extern enum cxx_dialect cxx_dialect;
 748
 749 /* Maximum template instantiation depth.  This limit is rather
 750    arbitrary, but it exists to limit the time it takes to notice
 751    excessively recursive template instantiations.  */
 752
 753 extern int max_tinst_depth;
 754
 755 /* Nonzero means that we should not issue warnings about problems that
 756    occur when the code is executed, because the code being processed
 757    is not expected to be executed.  This is set during parsing.  This
 758    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 759    not a bool, because unexecuted expressions can nest.  */
 760
 761 extern int c_inhibit_evaluation_warnings;
 762
 763 /* Depending on which phase of processing we are in, we may need
 764    to prefer input_location to libcpp's locations.  (Specifically,
 765    after the C++ lexer is done lexing tokens, but prior to calling
 766    cpp_finish (), we need to do so.  */
 767
 768 extern bool override_libcpp_locations;
 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.cc and cp/tree.cc.  FIXME.  */
 833 extern void c_register_addr_space (const char *str, addr_space_t as);
 834
 835 /* In c-common.cc.  */
 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 void start_fname_decls (void);
 844 extern void finish_fname_decls (void);
 845 extern const char *fname_as_string (int);
 846 extern tree fname_decl (location_t, unsigned, tree);
 847
 848 extern int check_user_alignment (const_tree, bool, bool);
 849 extern bool check_function_arguments (location_t loc, const_tree, const_tree,
 850                                       int, tree *, vec<location_t> *);
 851 extern void check_function_arguments_recurse (void (*)
 852                                               (void *, tree,
 853                                                unsigned HOST_WIDE_INT),
 854                                               void *, tree,
 855                                               unsigned HOST_WIDE_INT,
 856                                               opt_code);
 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, bool = false);
 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 extern unsigned int c_strict_flex_array_level_of (tree);
 911 extern bool c_option_is_from_cpp_diagnostics (int);
 912
 913 /* Used by convert_and_check; in front ends.  */
 914 extern tree convert_init (tree, tree);
 915
 916 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, false, 1)
 917 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, false, 1)
 918
 919 /* Subroutine of build_binary_op, used for certain operations.  */
 920 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 921
 922 /* Return true if division or modulo op0 / op1 or op0 % op1 may be shortened.
 923    We can shorten only if we can guarantee that op0 is not signed integral
 924    minimum or op1 is not -1, because e.g. (long long) INT_MIN / -1 is
 925    well defined INT_MAX + 1LL if long long is wider than int, but INT_MIN / -1
 926    is UB.  */
 927 inline bool
 928 may_shorten_divmod (tree op0, tree op1)
 929 {
 930   tree type0 = TREE_TYPE (op0);
 931   if (TYPE_UNSIGNED (type0))
 932     return true;
 933   /* A cast from narrower unsigned won't be signed integral minimum,
 934      but cast from same or wider precision unsigned could be.  */
 935   if (TREE_CODE (op0) == NOP_EXPR
 936       && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (op0, 0)))
 937       && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))
 938       && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0)))
 939           < TYPE_PRECISION (type0)))
 940     return true;
 941   if (TREE_CODE (op1) == INTEGER_CST && !integer_all_onesp (op1))
 942     return true;
 943   return false;
 944 }
 945
 946 /* Subroutine of build_binary_op, used for comparison operations.
 947    See if the operands have both been converted from subword integer types
 948    and, if so, perhaps change them both back to their original type.  */
 949 extern tree shorten_compare (location_t, tree *, tree *, tree *,
 950                              enum tree_code *);
 951
 952 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree,
 953                              bool = true);
 954
 955 /* Add qualifiers to a type, in the fashion for C.  */
 956 extern tree c_build_qualified_type (tree, int, tree = NULL_TREE, size_t = 0);
 957
 958 /* Build tree nodes and builtin functions common to both C and C++ language
 959    frontends.  */
 960 extern void c_common_nodes_and_builtins (void);
 961
 962 extern void disable_builtin_function (const char *);
 963
 964 extern void set_compound_literal_name (tree decl);
 965
 966 extern tree build_va_arg (location_t, tree, tree);
 967
 968 extern const unsigned int c_family_lang_mask;
 969 extern unsigned int c_common_option_lang_mask (void);
 970 extern void c_common_diagnostics_set_defaults (diagnostic_context *);
 971 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 972 extern void c_common_init_options_struct (struct gcc_options *);
 973 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 974 extern bool c_common_post_options (const char **);
 975 extern bool c_common_init (void);
 976 extern void c_common_finish (void);
 977 extern void c_common_parse_file (void);
 978 extern alias_set_type c_common_get_alias_set (tree);
 979 extern void c_register_builtin_type (tree, const char*);
 980 extern bool c_promoting_integer_type_p (const_tree);
 981 extern bool self_promoting_args_p (const_tree);
 982 extern tree strip_pointer_operator (tree);
 983 extern tree strip_pointer_or_array_types (tree);
 984 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 985
 986 /* This is the basic parsing function.  */
 987 extern void c_parse_file (void);
 988
 989 extern void c_parse_final_cleanups (void);
 990
 991 /* These macros provide convenient access to the various _STMT nodes.  */
 992
 993 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 994    if a statement expression.  */
 995 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 996   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 997
 998 /* Nonzero if a label has been added to the statement list.  */
 999 #define STATEMENT_LIST_HAS_LABEL(NODE) \
1000   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
1001
1002 /* C_MAYBE_CONST_EXPR accessors.  */
1003 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
1004   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
1005 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
1006   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
1007 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
1008   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
1009 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
1010   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
1011 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
1012   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
1013    && (TREE_CODE (EXPR) == INTEGER_CST                  \
1014        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
1015            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
1016
1017 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
1018 #define DECL_C_BIT_FIELD(NODE) \
1019   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
1020 #define SET_DECL_C_BIT_FIELD(NODE) \
1021   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
1022 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
1023   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
1024
1025 /* True if the decl was an unnamed bitfield.  */
1026 #define DECL_UNNAMED_BIT_FIELD(NODE) \
1027   (DECL_C_BIT_FIELD (NODE) && !DECL_NAME (NODE))
1028
1029 /* True iff TYPE is cv decltype(nullptr).  */
1030 #define NULLPTR_TYPE_P(TYPE) (TREE_CODE (TYPE) == NULLPTR_TYPE)
1031
1032 /* Returns the underlying type of the given enumeration type. The
1033    underlying type is determined in different ways, depending on the
1034    properties of the enum:
1035
1036      - In C++0x or C2x, the underlying type can be explicitly specified, e.g.,
1037
1038          enum E1 : char { ... } // underlying type is char
1039
1040      - In a C++0x scoped enumeration, the underlying type is int
1041        unless otherwises specified:
1042
1043          enum class E2 { ... } // underlying type is int
1044
1045      - Otherwise, the underlying type is determined based on the
1046        values of the enumerators. In this case, the
1047        ENUM_UNDERLYING_TYPE will not be set until after the definition
1048        of the enumeration is completed by finish_enum.  */
1049 #define ENUM_UNDERLYING_TYPE(TYPE) \
1050   TREE_TYPE (ENUMERAL_TYPE_CHECK (TYPE))
1051
1052 /* Determines whether an ENUMERAL_TYPE has an explicit
1053    underlying type.  */
1054 #define ENUM_FIXED_UNDERLYING_TYPE_P(NODE) (TYPE_LANG_FLAG_5 (NODE))
1055
1056 extern tree do_case (location_t, tree, tree, tree);
1057 extern tree build_stmt (location_t, enum tree_code, ...);
1058 extern tree build_real_imag_expr (location_t, enum tree_code, tree);
1059
1060 /* These functions must be defined by each front-end which implements
1061    a variant of the C language.  They are used in c-common.cc.  */
1062
1063 extern tree build_unary_op (location_t, enum tree_code, tree, bool);
1064 extern tree build_binary_op (location_t, enum tree_code, tree, tree, bool);
1065 extern tree perform_integral_promotions (tree);
1066
1067 /* These functions must be defined by each front-end which implements
1068    a variant of the C language.  They are used by port files.  */
1069
1070 extern tree default_conversion (tree);
1071
1072 /* Given two integer or real types, return the type for their sum.
1073    Given two compatible ANSI C types, returns the merged type.  */
1074
1075 extern tree common_type (tree, tree);
1076
1077 extern tree decl_constant_value (tree);
1078
1079 /* Handle increment and decrement of boolean types.  */
1080 extern tree boolean_increment (enum tree_code, tree);
1081
1082 extern int case_compare (splay_tree_key, splay_tree_key);
1083
1084 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree,
1085                               tree = NULL_TREE);
1086 extern bool c_switch_covers_all_cases_p (splay_tree, tree);
1087 extern bool c_block_may_fallthru (const_tree);
1088
1089 extern tree build_function_call (location_t, tree, tree);
1090
1091 extern tree build_function_call_vec (location_t, vec<location_t>, tree,
1092                                      vec<tree, va_gc> *, vec<tree, va_gc> *,
1093                                      tree = NULL_TREE);
1094
1095 extern tree resolve_overloaded_builtin (location_t, tree, vec<tree, va_gc> *);
1096
1097 extern tree finish_label_address_expr (tree, location_t);
1098
1099 /* Same function prototype, but the C and C++ front ends have
1100    different implementations.  Used in c-common.cc.  */
1101 extern tree lookup_label (tree);
1102 extern tree lookup_name (tree);
1103 extern bool lvalue_p (const_tree);
1104 extern int maybe_adjust_arg_pos_for_attribute (const_tree);
1105 extern bool instantiation_dependent_expression_p (tree);
1106
1107 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
1108 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
1109 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree, bool = true);
1110 extern tree c_build_shufflevector (location_t, tree, tree,
1111                                    const vec<tree> &, bool = true);
1112 extern tree c_build_vec_convert (location_t, tree, location_t, tree, bool = true);
1113
1114 extern void init_c_lex (void);
1115
1116 extern void c_cpp_builtins (cpp_reader *);
1117 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
1118 extern bool c_cpp_diagnostic (cpp_reader *, enum cpp_diagnostic_level,
1119                               enum cpp_warning_reason, rich_location *,
1120                               const char *, va_list *)
1121      ATTRIBUTE_GCC_DIAG(5,0);
1122 extern int c_common_has_attribute (cpp_reader *, bool);
1123 extern int c_common_has_builtin (cpp_reader *);
1124
1125 extern bool parse_optimize_options (tree, bool);
1126
1127 /* Positive if an implicit `extern "C"' scope has just been entered;
1128    negative if such a scope has just been exited.  */
1129 extern GTY(()) int pending_lang_change;
1130
1131 /* Information recorded about each file examined during compilation.  */
1132
1133 struct c_fileinfo
1134 {
1135   int time;     /* Time spent in the file.  */
1136
1137   /* Flags used only by C++.
1138      INTERFACE_ONLY nonzero means that we are in an "interface" section
1139      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
1140      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
1141      INTERFACE_ONLY is zero, it means that we are responsible for
1142      exporting definitions that others might need.  */
1143   short interface_only;
1144   short interface_unknown;
1145 };
1146
1147 struct c_fileinfo *get_fileinfo (const char *);
1148 extern void dump_time_statistics (void);
1149
1150 extern bool c_dump_tree (void *, tree);
1151
1152 extern void verify_sequence_points (tree);
1153
1154 extern tree fold_offsetof (tree, tree = size_type_node,
1155                            tree_code ctx = ERROR_MARK);
1156
1157 extern int complete_array_type (tree *, tree, bool);
1158 extern void complete_flexible_array_elts (tree);
1159
1160 extern tree builtin_type_for_size (int, bool);
1161
1162 extern void c_common_mark_addressable_vec (tree);
1163
1164 extern void set_underlying_type (tree);
1165 extern bool user_facing_original_type_p (const_tree);
1166 extern void record_types_used_by_current_var_decl (tree);
1167 extern vec<tree, va_gc> *make_tree_vector (void);
1168 extern void release_tree_vector (vec<tree, va_gc> *);
1169 extern vec<tree, va_gc> *make_tree_vector_single (tree);
1170 extern vec<tree, va_gc> *make_tree_vector_from_list (tree);
1171 extern vec<tree, va_gc> *make_tree_vector_from_ctor (tree);
1172 extern vec<tree, va_gc> *make_tree_vector_copy (const vec<tree, va_gc> *);
1173
1174 /* Used for communication between c_common_type_for_mode and
1175    c_register_builtin_type.  */
1176 extern GTY(()) tree registered_builtin_types;
1177
1178 /* Read SOURCE_DATE_EPOCH from environment to have a deterministic
1179    timestamp to replace embedded current dates to get reproducible
1180    results.  Returns -1 if SOURCE_DATE_EPOCH is not defined.  */
1181 extern time_t cb_get_source_date_epoch (cpp_reader *pfile);
1182
1183 /* The value (as a unix timestamp) corresponds to date
1184    "Dec 31 9999 23:59:59 UTC", which is the latest date that __DATE__ and
1185    __TIME__ can store.  */
1186 #define MAX_SOURCE_DATE_EPOCH HOST_WIDE_INT_C (253402300799)
1187
1188 /* Callback for libcpp for offering spelling suggestions for misspelled
1189    directives.  */
1190 extern const char *cb_get_suggestion (cpp_reader *, const char *,
1191                                       const char *const *);
1192
1193 extern GTY(()) string_concat_db *g_string_concat_db;
1194
1195 class substring_loc;
1196 extern const char *c_get_substring_location (const substring_loc &substr_loc,
1197                                              location_t *out_loc);
1198
1199 /* In c-gimplify.cc.  */
1200 typedef struct bc_state
1201 {
1202   tree bc_label[2];
1203 } bc_state_t;
1204 extern void save_bc_state (bc_state_t *);
1205 extern void restore_bc_state (bc_state_t *);
1206 extern tree c_genericize_control_stmt (tree *, int *, void *,
1207                                        walk_tree_fn, walk_tree_lh);
1208 extern void c_genericize (tree);
1209 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1210 extern tree c_build_bind_expr (location_t, tree, tree);
1211
1212 /* In c-lex.cc.  */
1213 extern enum cpp_ttype
1214 conflict_marker_get_final_tok_kind (enum cpp_ttype tok1_kind);
1215
1216 /* In c-pch.cc  */
1217 extern void pch_init (void);
1218 extern void pch_cpp_save_state (void);
1219 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1220 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1221                                const char *orig);
1222 extern void c_common_write_pch (void);
1223 extern void c_common_no_more_pch (void);
1224 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1225
1226 /* In *-checksum.c */
1227 extern const unsigned char executable_checksum[16];
1228
1229 /* In c-cppbuiltin.cc  */
1230 extern void builtin_define_std (const char *macro);
1231 extern void builtin_define_with_value (const char *, const char *, int);
1232 extern void builtin_define_with_int_value (const char *, HOST_WIDE_INT);
1233 extern void builtin_define_type_sizeof (const char *, tree);
1234 extern void c_stddef_cpp_builtins (void);
1235 extern void fe_file_change (const line_map_ordinary *);
1236 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char,
1237                            rich_location *richloc);
1238
1239 /* In c-ppoutput.cc  */
1240 extern void init_pp_output (FILE *);
1241 extern void preprocess_file (cpp_reader *);
1242 extern void pp_file_change (const line_map_ordinary *);
1243 extern void pp_dir_change (cpp_reader *, const char *);
1244 extern bool check_missing_format_attribute (tree, tree);
1245 extern void c_pp_stream_token (cpp_reader *, const cpp_token *, location_t loc);
1246
1247 /* In c-omp.cc  */
1248 typedef wide_int_bitmask omp_clause_mask;
1249
1250 #define OMP_CLAUSE_MASK_1 omp_clause_mask (1)
1251
1252 enum c_omp_clause_split
1253 {
1254   C_OMP_CLAUSE_SPLIT_TARGET = 0,
1255   C_OMP_CLAUSE_SPLIT_TEAMS,
1256   C_OMP_CLAUSE_SPLIT_DISTRIBUTE,
1257   C_OMP_CLAUSE_SPLIT_PARALLEL,
1258   C_OMP_CLAUSE_SPLIT_FOR,
1259   C_OMP_CLAUSE_SPLIT_SIMD,
1260   C_OMP_CLAUSE_SPLIT_COUNT,
1261   C_OMP_CLAUSE_SPLIT_SECTIONS = C_OMP_CLAUSE_SPLIT_FOR,
1262   C_OMP_CLAUSE_SPLIT_TASKLOOP = C_OMP_CLAUSE_SPLIT_FOR,
1263   C_OMP_CLAUSE_SPLIT_LOOP = C_OMP_CLAUSE_SPLIT_FOR,
1264   C_OMP_CLAUSE_SPLIT_MASKED = C_OMP_CLAUSE_SPLIT_DISTRIBUTE
1265 };
1266
1267 enum c_omp_region_type
1268 {
1269   C_ORT_OMP                     = 1 << 0,
1270   C_ORT_ACC                     = 1 << 1,
1271   C_ORT_DECLARE_SIMD            = 1 << 2,
1272   C_ORT_TARGET                  = 1 << 3,
1273   C_ORT_OMP_DECLARE_SIMD        = C_ORT_OMP | C_ORT_DECLARE_SIMD,
1274   C_ORT_OMP_TARGET              = C_ORT_OMP | C_ORT_TARGET
1275 };
1276
1277 extern tree c_finish_omp_master (location_t, tree);
1278 extern tree c_finish_omp_masked (location_t, tree, tree);
1279 extern tree c_finish_omp_taskgroup (location_t, tree, tree);
1280 extern tree c_finish_omp_critical (location_t, tree, tree, tree);
1281 extern tree c_finish_omp_ordered (location_t, tree, tree);
1282 extern void c_finish_omp_barrier (location_t);
1283 extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
1284                                  tree, tree, tree, tree, tree, tree, bool,
1285                                  enum omp_memory_order, bool, bool = false);
1286 extern bool c_omp_depend_t_p (tree);
1287 extern void c_finish_omp_depobj (location_t, tree, enum omp_clause_depend_kind,
1288                                  tree);
1289 extern void c_finish_omp_flush (location_t, int);
1290 extern void c_finish_omp_taskwait (location_t);
1291 extern void c_finish_omp_taskyield (location_t);
1292 extern tree c_finish_omp_for (location_t, enum tree_code, tree, tree, tree,
1293                               tree, tree, tree, tree, bool);
1294 extern bool c_omp_check_loop_iv (tree, tree, walk_tree_lh);
1295 extern bool c_omp_check_loop_iv_exprs (location_t, enum tree_code, tree, int,
1296                                        tree, tree, tree, walk_tree_lh);
1297 extern tree c_finish_oacc_wait (location_t, tree, tree);
1298 extern tree c_oacc_split_loop_clauses (tree, tree *, bool);
1299 extern void c_omp_split_clauses (location_t, enum tree_code, omp_clause_mask,
1300                                  tree, tree *);
1301 extern tree c_omp_declare_simd_clauses_to_numbers (tree, tree);
1302 extern void c_omp_declare_simd_clauses_to_decls (tree, tree);
1303 extern bool c_omp_predefined_variable (tree);
1304 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1305 extern enum omp_clause_defaultmap_kind c_omp_predetermined_mapping (tree);
1306 extern tree c_omp_check_context_selector (location_t, tree);
1307 extern void c_omp_mark_declare_variant (location_t, tree, tree);
1308 extern void c_omp_adjust_map_clauses (tree, bool);
1309
1310 enum c_omp_directive_kind {
1311   C_OMP_DIR_STANDALONE,
1312   C_OMP_DIR_CONSTRUCT,
1313   C_OMP_DIR_DECLARATIVE,
1314   C_OMP_DIR_UTILITY,
1315   C_OMP_DIR_INFORMATIONAL
1316 };
1317
1318 struct c_omp_directive {
1319   const char *first, *second, *third;
1320   unsigned int id;
1321   enum c_omp_directive_kind kind;
1322   bool simd;
1323 };
1324
1325 extern const struct c_omp_directive c_omp_directives[];
1326 extern const struct c_omp_directive *c_omp_categorize_directive (const char *,
1327                                                                  const char *,
1328                                                                  const char *);
1329
1330 /* Return next tree in the chain for chain_next walking of tree nodes.  */
1331 inline tree
1332 c_tree_chain_next (tree t)
1333 {
1334   /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1335      kind of object, never a long chain of nodes.  Prefer
1336      TYPE_NEXT_VARIANT for types.  */
1337   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1338     return TYPE_NEXT_VARIANT (t);
1339   /* Otherwise, if there is TREE_CHAIN, return it.  */
1340   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1341     return TREE_CHAIN (t);
1342   return NULL;
1343 }
1344
1345 /* Mask used by tm_stmt_attr.  */
1346 #define TM_STMT_ATTR_OUTER      2
1347 #define TM_STMT_ATTR_ATOMIC     4
1348 #define TM_STMT_ATTR_RELAXED    8
1349
1350 /* Mask used by tm_attr_to_mask and tm_mask_to_attr.  Note that these
1351    are ordered specifically such that more restrictive attributes are
1352    at lower bit positions.  This fact is known by the C++ tm attribute
1353    inheritance code such that least bit extraction (mask & -mask) results
1354    in the most restrictive attribute.  */
1355 #define TM_ATTR_SAFE                    1
1356 #define TM_ATTR_CALLABLE                2
1357 #define TM_ATTR_PURE                    4
1358 #define TM_ATTR_IRREVOCABLE             8
1359 #define TM_ATTR_MAY_CANCEL_OUTER        16
1360
1361 /* A suffix-identifier value doublet that represents user-defined literals
1362    for C++-0x.  */
1363 enum overflow_type {
1364   OT_UNDERFLOW = -1,
1365   OT_NONE,
1366   OT_OVERFLOW
1367 };
1368
1369 struct GTY(()) tree_userdef_literal {
1370   struct tree_base base;
1371   tree suffix_id;
1372   tree value;
1373   tree num_string;
1374   enum overflow_type overflow;
1375 };
1376
1377 #define USERDEF_LITERAL_SUFFIX_ID(NODE) \
1378   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->suffix_id)
1379
1380 #define USERDEF_LITERAL_VALUE(NODE) \
1381   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->value)
1382
1383 #define USERDEF_LITERAL_OVERFLOW(NODE) \
1384   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->overflow)
1385
1386 #define USERDEF_LITERAL_NUM_STRING(NODE) \
1387   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->num_string)
1388
1389 #define USERDEF_LITERAL_TYPE(NODE) \
1390   (TREE_TYPE (USERDEF_LITERAL_VALUE (NODE)))
1391
1392 extern tree build_userdef_literal (tree suffix_id, tree value,
1393                                    enum overflow_type overflow,
1394                                    tree num_string);
1395
1396
1397 /* WHILE_STMT accessors. These give access to the condition of the
1398    while statement and the body of the while statement, respectively.  */
1399 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
1400 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
1401
1402 /* DO_STMT accessors. These give access to the condition of the do
1403    statement and the body of the do statement, respectively.  */
1404 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
1405 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
1406
1407 /* FOR_STMT accessors. These give access to the init statement,
1408    condition, update expression, and body of the for statement,
1409    respectively.  */
1410 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
1411 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
1412 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
1413 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
1414 #define FOR_SCOPE(NODE)         TREE_OPERAND (FOR_STMT_CHECK (NODE), 4)
1415
1416 #define SWITCH_STMT_COND(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
1417 #define SWITCH_STMT_BODY(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
1418 #define SWITCH_STMT_TYPE(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
1419 #define SWITCH_STMT_SCOPE(NODE) TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 3)
1420 /* True if there are case labels for all possible values of switch cond, either
1421    because there is a default: case label or because the case label ranges cover
1422    all values.  */
1423 #define SWITCH_STMT_ALL_CASES_P(NODE) \
1424   TREE_LANG_FLAG_0 (SWITCH_STMT_CHECK (NODE))
1425 /* True if the body of a switch stmt contains no BREAK_STMTs.  */
1426 #define SWITCH_STMT_NO_BREAK_P(NODE) \
1427   TREE_LANG_FLAG_2 (SWITCH_STMT_CHECK (NODE))
1428
1429
1430 /* Nonzero if NODE is the target for genericization of 'break' stmts.  */
1431 #define LABEL_DECL_BREAK(NODE) \
1432   DECL_LANG_FLAG_0 (LABEL_DECL_CHECK (NODE))
1433
1434 /* Nonzero if NODE is the target for genericization of 'continue' stmts.  */
1435 #define LABEL_DECL_CONTINUE(NODE) \
1436   DECL_LANG_FLAG_1 (LABEL_DECL_CHECK (NODE))
1437
1438 extern bool convert_vector_to_array_for_subscript (location_t, tree *, tree);
1439
1440 /* Possibe cases of scalar_to_vector conversion.  */
1441 enum stv_conv {
1442   stv_error,        /* Error occurred.  */
1443   stv_nothing,      /* Nothing happened.  */
1444   stv_firstarg,     /* First argument must be expanded.  */
1445   stv_secondarg     /* Second argument must be expanded.  */
1446 };
1447
1448 extern enum stv_conv scalar_to_vector (location_t loc, enum tree_code code,
1449                                        tree op0, tree op1, bool);
1450
1451 extern tree find_inv_trees (tree *, int *, void *);
1452 extern tree replace_inv_trees (tree *, int *, void *);
1453
1454 extern bool reject_gcc_builtin (const_tree, location_t = UNKNOWN_LOCATION);
1455 extern bool valid_array_size_p (location_t, const_tree, tree, bool = true);
1456 extern void invalid_array_size_error (location_t, cst_size_error,
1457                                       const_tree, const_tree);
1458
1459 /* In c-warn.cc.  */
1460 extern void constant_expression_warning (tree);
1461 extern void constant_expression_error (tree);
1462 extern void overflow_warning (location_t, tree, tree = NULL_TREE);
1463 extern void warn_logical_operator (location_t, enum tree_code, tree,
1464                                    enum tree_code, tree, enum tree_code, tree);
1465 extern void warn_tautological_cmp (const op_location_t &, enum tree_code,
1466                                    tree, tree);
1467 extern void warn_logical_not_parentheses (location_t, enum tree_code, tree,
1468                                           tree);
1469 extern bool warn_if_unused_value (const_tree, location_t, bool = false);
1470 extern bool strict_aliasing_warning (location_t, tree, tree);
1471 extern void sizeof_pointer_memaccess_warning (location_t *, tree,
1472                                               vec<tree, va_gc> *, tree *,
1473                                               bool (*) (tree, tree));
1474 extern void check_main_parameter_types (tree decl);
1475 extern void warnings_for_convert_and_check (location_t, tree, tree, tree);
1476 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree, bool);
1477 extern void warn_for_omitted_condop (location_t, tree);
1478 extern bool warn_for_restrict (unsigned, tree *, unsigned);
1479 extern void warn_for_address_or_pointer_of_packed_member (tree, tree);
1480 extern void warn_parm_array_mismatch (location_t, tree, tree);
1481 extern void maybe_warn_sizeof_array_div (location_t, tree, tree, tree, tree);
1482 extern void do_warn_array_compare (location_t, tree_code, tree, tree);
1483
1484 /* Places where an lvalue, or modifiable lvalue, may be required.
1485    Used to select diagnostic messages in lvalue_error and
1486    readonly_error.  */
1487 enum lvalue_use {
1488   lv_assign,
1489   lv_increment,
1490   lv_decrement,
1491   lv_addressof,
1492   lv_asm
1493 };
1494
1495 extern void lvalue_error (location_t, enum lvalue_use);
1496 extern void invalid_indirection_error (location_t, tree, ref_operator);
1497 extern void readonly_error (location_t, tree, enum lvalue_use);
1498 extern void warn_array_subscript_with_type_char (location_t, tree);
1499 extern void warn_about_parentheses (location_t,
1500                                     enum tree_code,
1501                                     enum tree_code, tree,
1502                                     enum tree_code, tree);
1503 extern void warn_for_unused_label (tree label);
1504 extern void warn_for_div_by_zero (location_t, tree divisor);
1505 extern void warn_for_memset (location_t, tree, tree, int);
1506 extern void warn_for_sign_compare (location_t,
1507                                    tree orig_op0, tree orig_op1,
1508                                    tree op0, tree op1,
1509                                    tree result_type,
1510                                    enum tree_code resultcode);
1511 extern void do_warn_double_promotion (tree, tree, tree, const char *,
1512                                       location_t);
1513 extern void do_warn_unused_parameter (tree);
1514 extern void record_locally_defined_typedef (tree);
1515 extern void maybe_record_typedef_use (tree);
1516 extern void maybe_warn_unused_local_typedefs (void);
1517 extern void maybe_warn_bool_compare (location_t, enum tree_code, tree, tree);
1518 extern bool maybe_warn_shift_overflow (location_t, tree, tree);
1519 extern void warn_duplicated_cond_add_or_warn (location_t, tree, vec<tree> **);
1520 extern bool diagnose_mismatched_attributes (tree, tree);
1521 extern tree do_warn_duplicated_branches_r (tree *, int *, void *);
1522 extern void warn_for_multistatement_macros (location_t, location_t,
1523                                             location_t, enum rid);
1524
1525 extern void check_for_xor_used_as_pow (location_t lhs_loc, tree lhs_val,
1526                                        location_t operator_loc,
1527                                        location_t rhs_loc, tree rhs_val);
1528
1529 /* In c-attribs.cc.  */
1530 extern bool attribute_takes_identifier_p (const_tree);
1531 extern tree handle_deprecated_attribute (tree *, tree, tree, int, bool *);
1532 extern tree handle_unused_attribute (tree *, tree, tree, int, bool *);
1533 extern tree handle_fallthrough_attribute (tree *, tree, tree, int, bool *);
1534 extern int parse_tm_stmt_attr (tree, int);
1535 extern int tm_attr_to_mask (tree);
1536 extern tree tm_mask_to_attr (int);
1537 extern tree find_tm_attribute (tree);
1538 extern const struct attribute_spec::exclusions attr_cold_hot_exclusions[];
1539 extern const struct attribute_spec::exclusions attr_noreturn_exclusions[];
1540 extern tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
1541 extern bool has_attribute (location_t, tree, tree, tree (*)(tree));
1542 extern tree build_attr_access_from_parms (tree, bool);
1543
1544 /* In c-format.cc.  */
1545 extern bool valid_format_string_type_p (tree);
1546
1547 /* A bitmap of flags to positional_argument.  */
1548 enum posargflags {
1549   /* Consider positional attribute argument value zero valid.  */
1550   POSARG_ZERO = 1,
1551   /* Consider positional attribute argument value valid if it refers
1552      to the ellipsis (i.e., beyond the last typed argument).  */
1553   POSARG_ELLIPSIS = 2
1554 };
1555
1556 extern tree positional_argument (const_tree, const_tree, tree &, tree_code,
1557                                  int = 0, int = posargflags ());
1558
1559 extern enum flt_eval_method
1560 excess_precision_mode_join (enum flt_eval_method, enum flt_eval_method);
1561
1562 extern int c_flt_eval_method (bool ts18661_p);
1563 extern void add_no_sanitize_value (tree node, unsigned int flags);
1564
1565 extern void maybe_add_include_fixit (rich_location *, const char *, bool);
1566 extern void maybe_suggest_missing_token_insertion (rich_location *richloc,
1567                                                    enum cpp_ttype token_type,
1568                                                    location_t prev_token_loc);
1569 extern tree braced_lists_to_strings (tree, tree);
1570
1571 #if CHECKING_P
1572 namespace selftest {
1573   /* Declarations for specific families of tests within c-family,
1574      by source file, in alphabetical order.  */
1575   extern void c_diagnostic_cc_tests (void);
1576   extern void c_format_cc_tests (void);
1577   extern void c_indentation_cc_tests (void);
1578   extern void c_opt_problem_cc_tests (void);
1579   extern void c_pretty_print_cc_tests (void);
1580   extern void c_spellcheck_cc_tests (void);
1581
1582   /* The entrypoint for running all of the above tests.  */
1583   extern void c_family_tests (void);
1584 } // namespace selftest
1585 #endif /* #if CHECKING_P */
1586
1587 #endif /* ! GCC_C_COMMON_H */