gcc/c-family/c-common.h

   1 /* Definitions for c-common.cc.
   2    Copyright (C) 1987-2024 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,  RID_BITINT,
 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,  RID_BUILTIN_STDC,
 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   /* C++11 */
 172   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 173
 174   /* C++20 */
 175   RID_CONSTINIT, RID_CONSTEVAL,
 176
 177   /* char8_t */
 178   RID_CHAR8,
 179
 180   /* C++ concepts */
 181   RID_CONCEPT, RID_REQUIRES,
 182
 183   /* C++ modules.  */
 184   RID__MODULE, RID__IMPORT, RID__EXPORT, /* Internal tokens.  */
 185
 186   /* C++ coroutines */
 187   RID_CO_AWAIT, RID_CO_YIELD, RID_CO_RETURN,
 188
 189   /* C++ transactional memory.  */
 190   RID_ATOMIC_NOEXCEPT, RID_ATOMIC_CANCEL, RID_SYNCHRONIZED,
 191
 192   /* Objective-C ("AT" reserved words - they are only keywords when
 193      they follow '@')  */
 194   RID_AT_ENCODE,   RID_AT_END,
 195   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 196   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 197   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 198   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 199   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 200   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 201   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 202   RID_AT_INTERFACE,
 203   RID_AT_IMPLEMENTATION,
 204
 205   /* OpenMP */
 206   RID_OMP_ALL_MEMORY,
 207
 208   /* Named address support, mapping the keyword to a particular named address
 209      number.  Named address space 0 is reserved for the generic address.  If
 210      there are more than 254 named addresses, the addr_space_t type will need
 211      to be grown from an unsigned char to unsigned short.  */
 212   RID_ADDR_SPACE_0,             /* generic address */
 213   RID_ADDR_SPACE_1,
 214   RID_ADDR_SPACE_2,
 215   RID_ADDR_SPACE_3,
 216   RID_ADDR_SPACE_4,
 217   RID_ADDR_SPACE_5,
 218   RID_ADDR_SPACE_6,
 219   RID_ADDR_SPACE_7,
 220   RID_ADDR_SPACE_8,
 221   RID_ADDR_SPACE_9,
 222   RID_ADDR_SPACE_10,
 223   RID_ADDR_SPACE_11,
 224   RID_ADDR_SPACE_12,
 225   RID_ADDR_SPACE_13,
 226   RID_ADDR_SPACE_14,
 227   RID_ADDR_SPACE_15,
 228
 229   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 230   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 231
 232   /* __intN keywords.  The _N_M here doesn't correspond to the intN
 233      in the keyword; use the bitsize in int_n_t_data_t[M] for that.
 234      For example, if int_n_t_data_t[0].bitsize is 13, then RID_INT_N_0
 235      is for __int13.  */
 236
 237   /* Note that the range to use is RID_FIRST_INT_N through
 238      RID_FIRST_INT_N + NUM_INT_N_ENTS - 1 and c-parser.cc has a list of
 239      all RID_INT_N_* in a case statement.  */
 240
 241   RID_INT_N_0,
 242   RID_INT_N_1,
 243   RID_INT_N_2,
 244   RID_INT_N_3,
 245
 246   RID_FIRST_INT_N = RID_INT_N_0,
 247   RID_LAST_INT_N = RID_INT_N_3,
 248
 249   RID_MAX,
 250
 251   RID_FIRST_MODIFIER = RID_STATIC,
 252   RID_LAST_MODIFIER = RID_ONEWAY,
 253
 254   RID_FIRST_CXX11 = RID_CONSTEXPR,
 255   RID_LAST_CXX11 = RID_STATIC_ASSERT,
 256   RID_FIRST_CXX20 = RID_CONSTINIT,
 257   RID_LAST_CXX20 = RID_CO_RETURN,
 258   RID_FIRST_AT = RID_AT_ENCODE,
 259   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 260   RID_FIRST_PQ = RID_IN,
 261   RID_LAST_PQ = RID_ONEWAY,
 262   RID_FIRST_PATTR = RID_GETTER,
 263   RID_LAST_PATTR = RID_NULL_RESETTABLE
 264 };
 265
 266 #define OBJC_IS_AT_KEYWORD(rid) \
 267   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 268    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 269
 270 #define OBJC_IS_PQ_KEYWORD(rid) \
 271   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 272    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 273
 274 /* Keywords permitted in an @property attribute context.  */
 275 #define OBJC_IS_PATTR_KEYWORD(rid) \
 276   ((((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 277      (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)) \
 278    || rid == RID_CLASS)
 279
 280 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 281    'class') which are shared in a subtle way between Objective-C and
 282    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 283    finds '@' followed by one of these identifiers (eg, '@class'), it
 284    recognizes the whole as an Objective-C keyword.  If the identifier
 285    is found elsewhere, it follows the rules of the C/C++ language.
 286  */
 287 #define OBJC_IS_CXX_KEYWORD(rid) \
 288   (rid == RID_CLASS || rid == RID_SYNCHRONIZED                  \
 289    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 290    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 291
 292 /* The elements of `ridpointers' are identifier nodes for the reserved
 293    type names and storage classes.  It is indexed by a RID_... value.  */
 294 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 295
 296 /* Standard named or nameless data types of the C compiler.  */
 297
 298 enum c_tree_index
 299 {
 300     CTI_CHAR8_TYPE,
 301     CTI_CHAR16_TYPE,
 302     CTI_CHAR32_TYPE,
 303     CTI_WCHAR_TYPE,
 304     CTI_UNDERLYING_WCHAR_TYPE,
 305     CTI_WINT_TYPE,
 306     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 307     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 308     CTI_INTMAX_TYPE,
 309     CTI_UINTMAX_TYPE,
 310     CTI_WIDEST_INT_LIT_TYPE,
 311     CTI_WIDEST_UINT_LIT_TYPE,
 312
 313     /* Types for <stdint.h>, that may not be defined on all
 314        targets.  */
 315     CTI_SIG_ATOMIC_TYPE,
 316     CTI_INT8_TYPE,
 317     CTI_INT16_TYPE,
 318     CTI_INT32_TYPE,
 319     CTI_INT64_TYPE,
 320     CTI_UINT8_TYPE,
 321     CTI_UINT16_TYPE,
 322     CTI_UINT32_TYPE,
 323     CTI_UINT64_TYPE,
 324     CTI_INT_LEAST8_TYPE,
 325     CTI_INT_LEAST16_TYPE,
 326     CTI_INT_LEAST32_TYPE,
 327     CTI_INT_LEAST64_TYPE,
 328     CTI_UINT_LEAST8_TYPE,
 329     CTI_UINT_LEAST16_TYPE,
 330     CTI_UINT_LEAST32_TYPE,
 331     CTI_UINT_LEAST64_TYPE,
 332     CTI_INT_FAST8_TYPE,
 333     CTI_INT_FAST16_TYPE,
 334     CTI_INT_FAST32_TYPE,
 335     CTI_INT_FAST64_TYPE,
 336     CTI_UINT_FAST8_TYPE,
 337     CTI_UINT_FAST16_TYPE,
 338     CTI_UINT_FAST32_TYPE,
 339     CTI_UINT_FAST64_TYPE,
 340     CTI_INTPTR_TYPE,
 341     CTI_UINTPTR_TYPE,
 342
 343     CTI_CHAR_ARRAY_TYPE,
 344     CTI_CHAR8_ARRAY_TYPE,
 345     CTI_CHAR16_ARRAY_TYPE,
 346     CTI_CHAR32_ARRAY_TYPE,
 347     CTI_WCHAR_ARRAY_TYPE,
 348     CTI_STRING_TYPE,
 349     CTI_CONST_STRING_TYPE,
 350
 351     /* Type for boolean expressions (bool in C++, int in C).  */
 352     CTI_TRUTHVALUE_TYPE,
 353     CTI_TRUTHVALUE_TRUE,
 354     CTI_TRUTHVALUE_FALSE,
 355
 356     CTI_DEFAULT_FUNCTION_TYPE,
 357
 358     CTI_NULL,
 359     CTI_NULLPTR,
 360     CTI_NULLPTR_TYPE,
 361
 362     /* These are not types, but we have to look them up all the time.  */
 363     CTI_FUNCTION_NAME_DECL,
 364     CTI_PRETTY_FUNCTION_NAME_DECL,
 365     CTI_C99_FUNCTION_NAME_DECL,
 366
 367     CTI_MODULE_HWM,
 368     /* Below here entities change during compilation.  */
 369
 370     CTI_SAVED_FUNCTION_NAME_DECLS,
 371
 372     CTI_MAX
 373 };
 374
 375 #define C_CPP_HASHNODE(id) \
 376   (&(((struct c_common_identifier *) (id))->node))
 377 #define C_RID_CODE(id) \
 378   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 379 #define C_SET_RID_CODE(id, code) \
 380   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 381
 382 /* Identifier part common to the C front ends.  Inherits from
 383    tree_identifier, despite appearances.  */
 384 struct GTY(()) c_common_identifier {
 385   struct tree_common common;
 386   struct cpp_hashnode node;
 387 };
 388
 389 /* An entry in the reserved keyword table.  */
 390
 391 struct c_common_resword
 392 {
 393   const char *const word;
 394   ENUM_BITFIELD(rid) const rid : 16;
 395   const unsigned int disable   : 32;
 396 };
 397
 398 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 399
 400 extern machine_mode c_default_pointer_mode;
 401
 402 /* Extra cpp_ttype values for C++.  */
 403
 404 /* A token type for template-ids.  If a template-id is processed while
 405    parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
 406    the value of the CPP_TEMPLATE_ID is whatever was returned by
 407    cp_parser_template_id.  */
 408 #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
 409
 410 /* A token type for nested-name-specifiers.  If a
 411    nested-name-specifier is processed while parsing tentatively, it is
 412    replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
 413    CPP_NESTED_NAME_SPECIFIER is whatever was returned by
 414    cp_parser_nested_name_specifier_opt.  */
 415 #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
 416
 417 /* A token type for pre-parsed C++0x decltype.  */
 418 #define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
 419
 420 /* A token type for pre-parsed primary-expression (lambda- or statement-).  */
 421 #define CPP_PREPARSED_EXPR ((enum cpp_ttype) (CPP_DECLTYPE + 1))
 422
 423 /* The number of token types, including C++-specific ones.  */
 424 #define N_CP_TTYPES ((int) (CPP_PREPARSED_EXPR + 1))
 425
 426 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 427    mask) is _true_.  Thus for keywords which are present in all
 428    languages the disable field is zero.  */
 429
 430 #define D_CONLY         0x0001  /* C only (not in C++).  */
 431 #define D_CXXONLY       0x0002  /* C++ only (not in C).  */
 432 #define D_C99           0x0004  /* In C, C99 only.  */
 433 #define D_C23           0x0008  /* In C, C23 only.  */
 434 #define D_CXX11         0x0010  /* In C++, C++11 only.  */
 435 #define D_EXT           0x0020  /* GCC extension.  */
 436 #define D_EXT89         0x0040  /* GCC extension incorporated in C99.  */
 437 #define D_EXT11         0x0080  /* GCC extension incorporated in C23.  */
 438 #define D_ASM           0x0100  /* Disabled by -fno-asm.  */
 439 #define D_OBJC          0x0200  /* In Objective C and neither C nor C++.  */
 440 #define D_CXX_OBJC      0x0400  /* In Objective C, and C++, but not C.  */
 441 #define D_CXXWARN       0x0800  /* In C warn with -Wcxx-compat.  */
 442 #define D_CXX_CONCEPTS  0x1000  /* In C++, only with concepts.  */
 443 #define D_TRANSMEM      0x2000  /* C++ transactional memory TS.  */
 444 #define D_CXX_CHAR8_T   0x4000  /* In C++, only with -fchar8_t.  */
 445 #define D_CXX20         0x8000  /* In C++, C++20 only.  */
 446 #define D_CXX_COROUTINES 0x10000  /* In C++, only with coroutines.  */
 447 #define D_CXX_MODULES   0x20000  /* In C++, only with modules.  */
 448
 449 #define D_CXX_CONCEPTS_FLAGS D_CXXONLY | D_CXX_CONCEPTS
 450 #define D_CXX_CHAR8_T_FLAGS D_CXXONLY | D_CXX_CHAR8_T
 451 #define D_CXX_MODULES_FLAGS (D_CXXONLY | D_CXX_MODULES)
 452 #define D_CXX_COROUTINES_FLAGS (D_CXXONLY | D_CXX_COROUTINES)
 453
 454 /* The reserved keyword table.  */
 455 extern const struct c_common_resword c_common_reswords[];
 456
 457 /* The number of items in the reserved keyword table.  */
 458 extern const unsigned int num_c_common_reswords;
 459
 460 #define char8_type_node                 c_global_trees[CTI_CHAR8_TYPE]
 461 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 462 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 463 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 464 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 465 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 466 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 467 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 468 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 469 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 470 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 471 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 472
 473 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 474 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 475 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 476 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 477 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 478 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 479 #define c_uint16_type_node              c_global_trees[CTI_UINT16_TYPE]
 480 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 481 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 482 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 483 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 484 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 485 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 486 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 487 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 488 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 489 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 490 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 491 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 492 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 493 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 494 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 495 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 496 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 497 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 498 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 499 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 500
 501 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 502 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 503 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 504
 505 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 506 #define char8_array_type_node           c_global_trees[CTI_CHAR8_ARRAY_TYPE]
 507 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 508 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 509 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 510 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 511 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 512
 513 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 514
 515 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 516 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 517 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 518 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 519
 520 /* The node for C++ `__null'.  */
 521 #define null_node                       c_global_trees[CTI_NULL]
 522 /* The nodes for `nullptr'.  */
 523 #define nullptr_node                    c_global_trees[CTI_NULLPTR]
 524 #define nullptr_type_node               c_global_trees[CTI_NULLPTR_TYPE]
 525
 526 extern GTY(()) tree c_global_trees[CTI_MAX];
 527
 528 /* Mark which labels are explicitly declared.
 529    These may be shadowed, and may be referenced from nested functions.  */
 530 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 531
 532 enum c_language_kind
 533 {
 534   clk_c         = 0,            /* C90, C94, C99, C11 or C23 */
 535   clk_objc      = 1,            /* clk_c with ObjC features.  */
 536   clk_cxx       = 2,            /* ANSI/ISO C++ */
 537   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 538 };
 539
 540 /* To test for a specific language use c_language, defined by each
 541    front end.  For "ObjC features" or "not C++" use the macros.  */
 542 extern c_language_kind c_language;
 543
 544 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 545 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 546
 547 /* The various name of operator that appears in error messages. */
 548 enum ref_operator {
 549   /* NULL */
 550   RO_NULL,
 551   /* array indexing */
 552   RO_ARRAY_INDEXING,
 553   /* unary * */
 554   RO_UNARY_STAR,
 555   /* -> */
 556   RO_ARROW,
 557   /* implicit conversion */
 558   RO_IMPLICIT_CONVERSION,
 559   /* ->* */
 560   RO_ARROW_STAR
 561 };
 562
 563 /* Information about a statement tree.  */
 564
 565 struct GTY(()) stmt_tree_s {
 566   /* A stack of statement lists being collected.  */
 567   vec<tree, va_gc> *x_cur_stmt_list;
 568
 569   /* In C++, Nonzero if we should treat statements as full
 570      expressions.  In particular, this variable is non-zero if at the
 571      end of a statement we should destroy any temporaries created
 572      during that statement.  Similarly, if, at the end of a block, we
 573      should destroy any local variables in this block.  Normally, this
 574      variable is nonzero, since those are the normal semantics of
 575      C++.
 576
 577      This flag has no effect in C.  */
 578   int stmts_are_full_exprs_p;
 579 };
 580
 581 typedef struct stmt_tree_s *stmt_tree;
 582
 583 /* Global state pertinent to the current function.  Some C dialects
 584    extend this structure with additional fields.  */
 585
 586 struct GTY(()) c_language_function {
 587   /* While we are parsing the function, this contains information
 588      about the statement-tree that we are building.  */
 589   struct stmt_tree_s x_stmt_tree;
 590
 591   /* Vector of locally defined typedefs, for
 592      -Wunused-local-typedefs.  */
 593   vec<tree, va_gc> *local_typedefs;
 594 };
 595
 596 #define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
 597
 598 /* When building a statement-tree, this is the current statement list
 599    being collected.  */
 600 #define cur_stmt_list   (stmt_list_stack->last ())
 601
 602 #define building_stmt_list_p() (stmt_list_stack && !stmt_list_stack->is_empty())
 603
 604 /* Language-specific hooks.  */
 605
 606 /* If non-NULL, this function is called after a precompile header file
 607    is loaded.  */
 608 extern void (*lang_post_pch_load) (void);
 609
 610 extern void push_file_scope (void);
 611 extern void pop_file_scope (void);
 612 extern stmt_tree current_stmt_tree (void);
 613 extern tree push_stmt_list (void);
 614 extern tree pop_stmt_list (tree);
 615 extern tree add_stmt (tree);
 616 extern void push_cleanup (tree, tree, bool);
 617
 618 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 619                                location_t, tree, tree);
 620 extern tree build_indirect_ref (location_t, tree, ref_operator);
 621
 622 extern bool has_c_linkage (const_tree decl);
 623 extern bool c_decl_implicit (const_tree);
 624 \f
 625 /* Switches common to the C front ends.  */
 626
 627 /* Nonzero means don't output line number information.  */
 628
 629 extern char flag_no_line_commands;
 630
 631 /* Nonzero causes -E output not to be done, but directives such as
 632    #define that have side effects are still obeyed.  */
 633
 634 extern char flag_no_output;
 635
 636 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 637    'N' or 'U' of the command line switch.  */
 638
 639 extern char flag_dump_macros;
 640
 641 /* Nonzero means pass #include lines through to the output.  */
 642
 643 extern char flag_dump_includes;
 644
 645 /* Nonzero means process PCH files while preprocessing.  */
 646
 647 extern bool flag_pch_preprocess;
 648
 649 /* The file name to which we should write a precompiled header, or
 650    NULL if no header will be written in this compile.  */
 651
 652 extern const char *pch_file;
 653
 654 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 655    user's namespace.  */
 656
 657 extern int flag_iso;
 658
 659 /* C/ObjC language option variables.  */
 660
 661
 662 /* Nonzero means allow type mismatches in conditional expressions;
 663    just make their values `void'.  */
 664
 665 extern int flag_cond_mismatch;
 666
 667 /* Nonzero means enable C89 Amendment 1 features.  */
 668
 669 extern int flag_isoc94;
 670
 671 /* Nonzero means use the ISO C99 (or later) dialect of C.  */
 672
 673 extern int flag_isoc99;
 674
 675 /* Nonzero means use the ISO C11 (or later) dialect of C.  */
 676
 677 extern int flag_isoc11;
 678
 679 /* Nonzero means use the ISO C23 dialect of C.  */
 680
 681 extern int flag_isoc23;
 682
 683 /* Nonzero means that we have builtin functions, and main is an int.  */
 684
 685 extern int flag_hosted;
 686
 687 /* ObjC language option variables.  */
 688
 689
 690 /* Tells the compiler that this is a special run.  Do not perform any
 691    compiling, instead we are to test some platform dependent features
 692    and output a C header file with appropriate definitions.  */
 693
 694 extern int print_struct_values;
 695
 696 /* Tells the compiler what is the constant string class for ObjC.  */
 697
 698 extern const char *constant_string_class_name;
 699
 700
 701 /* C++ language option variables.  */
 702
 703 /* The reference version of the ABI for -Wabi.  */
 704
 705 extern int warn_abi_version;
 706
 707 /* Return TRUE if one of {flag_abi_version,flag_abi_compat_version} is
 708    less than N and the other is at least N.  */
 709 #define abi_compat_version_crosses(N)           \
 710   (abi_version_at_least(N)                      \
 711    != (flag_abi_compat_version == 0             \
 712        || flag_abi_compat_version >= (N)))
 713
 714 /* Return TRUE if one of {flag_abi_version,warn_abi_version} is
 715    less than N and the other is at least N, for use by -Wabi.  */
 716 #define abi_version_crosses(N)                  \
 717   (abi_version_at_least(N)                      \
 718    != (warn_abi_version == 0                    \
 719        || warn_abi_version >= (N)))
 720
 721 /* The supported C++ dialects.  */
 722
 723 enum cxx_dialect {
 724   cxx_unset,
 725   /* C++98 with TC1  */
 726   cxx98,
 727   cxx03 = cxx98,
 728   /* C++11  */
 729   cxx0x,
 730   cxx11 = cxx0x,
 731   /* C++14 */
 732   cxx14,
 733   /* C++17 */
 734   cxx17,
 735   /* C++20 */
 736   cxx20,
 737   /* C++23 */
 738   cxx23,
 739   /* C++26 */
 740   cxx26
 741 };
 742
 743 /* The C++ dialect being used. C++98 is the default.  */
 744 extern enum cxx_dialect cxx_dialect;
 745
 746 /* Maximum template instantiation depth.  This limit is rather
 747    arbitrary, but it exists to limit the time it takes to notice
 748    excessively recursive template instantiations.  */
 749
 750 extern int max_tinst_depth;
 751
 752 /* Nonzero means that we should not issue warnings about problems that
 753    occur when the code is executed, because the code being processed
 754    is not expected to be executed.  This is set during parsing.  This
 755    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 756    not a bool, because unexecuted expressions can nest.  */
 757
 758 extern int c_inhibit_evaluation_warnings;
 759
 760 /* Depending on which phase of processing we are in, we may need
 761    to prefer input_location to libcpp's locations.  (Specifically,
 762    after the C++ lexer is done lexing tokens, but prior to calling
 763    cpp_finish (), we need to do so.  */
 764
 765 extern bool override_libcpp_locations;
 766
 767 /* C types are partitioned into three subsets: object, function, and
 768    incomplete types.  */
 769 #define C_TYPE_OBJECT_P(type) \
 770   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 771
 772 #define C_TYPE_INCOMPLETE_P(type) \
 773   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 774
 775 #define C_TYPE_FUNCTION_P(type) \
 776   (TREE_CODE (type) == FUNCTION_TYPE)
 777
 778 /* For convenience we define a single macro to identify the class of
 779    object or incomplete types.  */
 780 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 781   (!C_TYPE_FUNCTION_P (type))
 782
 783 /* Return true if TYPE is a vector type that should be subject to the GNU
 784    vector extensions (as opposed to a vector type that is used only for
 785    the purposes of defining target-specific built-in functions).  */
 786
 787 inline bool
 788 gnu_vector_type_p (const_tree type)
 789 {
 790   return VECTOR_TYPE_P (type) && !TYPE_INDIVISIBLE_P (type);
 791 }
 792
 793 struct visibility_flags
 794 {
 795   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 796   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 797 };
 798
 799 /* These enumerators are possible types of unsafe conversions.  */
 800 enum conversion_safety {
 801   /* The conversion is safe.  */
 802   SAFE_CONVERSION = 0,
 803   /* Another type of conversion with problems.  */
 804   UNSAFE_OTHER,
 805   /* Conversion between signed and unsigned integers.  */
 806   UNSAFE_SIGN,
 807   /* Conversions that reduce the precision of reals including conversions
 808      from reals to integers.  */
 809   UNSAFE_REAL,
 810   /* Conversions from complex to reals or integers, that discard imaginary
 811      component.  */
 812   UNSAFE_IMAGINARY
 813 };
 814
 815 /* Global visibility options.  */
 816 extern struct visibility_flags visibility_options;
 817
 818 /* Attribute table common to the C front ends.  */
 819 extern const struct scoped_attribute_specs c_common_gnu_attribute_table;
 820 extern const struct scoped_attribute_specs c_common_format_attribute_table;
 821
 822 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 823    ID is the identifier to use, NAME is the string.
 824    TYPE_DEP indicates whether it depends on type of the function or not
 825    (i.e. __PRETTY_FUNCTION__).  */
 826
 827 extern tree (*make_fname_decl) (location_t, tree, int);
 828
 829 /* In c-decl.cc and cp/tree.cc.  FIXME.  */
 830 extern void c_register_addr_space (const char *str, addr_space_t as);
 831
 832 /* In c-common.cc.  */
 833 extern bool in_late_binary_op;
 834 extern const char *c_addr_space_name (addr_space_t as);
 835 extern tree identifier_global_value (tree);
 836 extern tree identifier_global_tag (tree);
 837 extern bool names_builtin_p (const char *);
 838 extern tree c_linkage_bindings (tree);
 839 extern void record_builtin_type (enum rid, const char *, tree);
 840 extern void start_fname_decls (void);
 841 extern void finish_fname_decls (void);
 842 extern const char *fname_as_string (int);
 843 extern tree fname_decl (location_t, unsigned, tree);
 844
 845 extern int check_user_alignment (const_tree, bool, bool);
 846 extern bool check_function_arguments (location_t loc, const_tree, const_tree,
 847                                       int, tree *, vec<location_t> *);
 848 extern void check_function_arguments_recurse (void (*)
 849                                               (void *, tree,
 850                                                unsigned HOST_WIDE_INT),
 851                                               void *, tree,
 852                                               unsigned HOST_WIDE_INT,
 853                                               opt_code);
 854 extern bool check_builtin_function_arguments (location_t, vec<location_t>,
 855                                               tree, tree, int, tree *);
 856 extern void check_function_format (const_tree, tree, int, tree *,
 857                                    vec<location_t> *);
 858 extern bool attribute_fallthrough_p (tree);
 859 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 860 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 861 extern bool c_common_handle_option (size_t, const char *, HOST_WIDE_INT, int,
 862                                     location_t,
 863                                     const struct cl_option_handlers *);
 864 extern bool default_handle_c_option (size_t, const char *, int);
 865 extern tree c_common_type_for_mode (machine_mode, int);
 866 extern tree c_common_type_for_size (unsigned int, int);
 867 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 868                                                 int, int);
 869 extern tree c_common_unsigned_type (tree);
 870 extern tree c_common_signed_type (tree);
 871 extern tree c_common_signed_or_unsigned_type (int, tree);
 872 extern void c_common_init_ts (void);
 873 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 874 extern enum conversion_safety unsafe_conversion_p (tree, tree, tree, bool);
 875 extern bool decl_with_nonnull_addr_p (const_tree);
 876 extern tree c_fully_fold (tree, bool, bool *, bool = false);
 877 extern tree c_wrap_maybe_const (tree, bool);
 878 extern tree c_common_truthvalue_conversion (location_t, tree);
 879 extern void c_apply_type_quals_to_decl (int, tree);
 880 extern tree c_sizeof_or_alignof_type (location_t, tree, bool, bool, int);
 881 extern tree c_alignof_expr (location_t, tree);
 882 /* Print an error message for invalid operands to arith operation CODE.
 883    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 884 extern void binary_op_error (rich_location *, enum tree_code, tree, tree);
 885 extern tree fix_string_type (tree);
 886 extern tree convert_and_check (location_t, tree, tree, bool = false);
 887 extern bool c_determine_visibility (tree);
 888 extern bool vector_types_compatible_elements_p (tree, tree);
 889 extern void mark_valid_location_for_stdc_pragma (bool);
 890 extern bool valid_location_for_stdc_pragma_p (void);
 891 extern void set_float_const_decimal64 (void);
 892 extern void clear_float_const_decimal64 (void);
 893 extern bool float_const_decimal64_p (void);
 894
 895 extern bool keyword_begins_type_specifier (enum rid);
 896 extern bool keyword_is_storage_class_specifier (enum rid);
 897 extern bool keyword_is_type_qualifier (enum rid);
 898 extern bool keyword_is_decl_specifier (enum rid);
 899 extern unsigned max_align_t_align (void);
 900 extern bool cxx_fundamental_alignment_p (unsigned);
 901 extern bool pointer_to_zero_sized_aggr_p (tree);
 902 extern bool bool_promoted_to_int_p (tree);
 903 extern tree fold_for_warn (tree);
 904 extern tree c_common_get_narrower (tree, int *);
 905 extern bool get_attribute_operand (tree, unsigned HOST_WIDE_INT *);
 906 extern void c_common_finalize_early_debug (void);
 907 extern unsigned int c_strict_flex_array_level_of (tree);
 908 extern bool c_option_is_from_cpp_diagnostics (int);
 909 extern tree c_hardbool_type_attr_1 (tree, tree *, tree *);
 910
 911 /* Used by convert_and_check; in front ends.  */
 912 extern tree convert_init (tree, tree);
 913
 914 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, false, 1)
 915 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, false, 1)
 916
 917 /* Subroutine of build_binary_op, used for certain operations.  */
 918 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 919
 920 /* Return true if division or modulo op0 / op1 or op0 % op1 may be shortened.
 921    We can shorten only if we can guarantee that op0 is not signed integral
 922    minimum or op1 is not -1, because e.g. (long long) INT_MIN / -1 is
 923    well defined INT_MAX + 1LL if long long is wider than int, but INT_MIN / -1
 924    is UB.  */
 925 inline bool
 926 may_shorten_divmod (tree op0, tree op1)
 927 {
 928   tree type0 = TREE_TYPE (op0);
 929   if (TYPE_UNSIGNED (type0))
 930     return true;
 931   /* A cast from narrower unsigned won't be signed integral minimum,
 932      but cast from same or wider precision unsigned could be.  */
 933   if (TREE_CODE (op0) == NOP_EXPR
 934       && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (op0, 0)))
 935       && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))
 936       && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0)))
 937           < TYPE_PRECISION (type0)))
 938     return true;
 939   if (TREE_CODE (op1) == INTEGER_CST && !integer_all_onesp (op1))
 940     return true;
 941   return false;
 942 }
 943
 944 /* Subroutine of build_binary_op, used for comparison operations.
 945    See if the operands have both been converted from subword integer types
 946    and, if so, perhaps change them both back to their original type.  */
 947 extern tree shorten_compare (location_t, tree *, tree *, tree *,
 948                              enum tree_code *);
 949
 950 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree,
 951                              bool = true);
 952
 953 /* Add qualifiers to a type, in the fashion for C.  */
 954 extern tree c_build_qualified_type (tree, int, tree = NULL_TREE, size_t = 0);
 955
 956 /* Build tree nodes and builtin functions common to both C and C++ language
 957    frontends.  */
 958 extern void c_common_nodes_and_builtins (void);
 959
 960 extern void disable_builtin_function (const char *);
 961
 962 extern void set_compound_literal_name (tree decl);
 963
 964 extern tree build_va_arg (location_t, tree, tree);
 965
 966 extern const unsigned int c_family_lang_mask;
 967 extern unsigned int c_common_option_lang_mask (void);
 968 extern void c_common_diagnostics_set_defaults (diagnostic_context *);
 969 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 970 extern void c_common_init_options_struct (struct gcc_options *);
 971 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 972 extern bool c_common_post_options (const char **);
 973 extern bool c_common_init (void);
 974 extern void c_common_finish (void);
 975 extern void c_common_parse_file (void);
 976 extern alias_set_type c_common_get_alias_set (tree);
 977 extern void c_register_builtin_type (tree, const char*);
 978 extern bool c_promoting_integer_type_p (const_tree);
 979 extern bool self_promoting_args_p (const_tree);
 980 extern tree strip_pointer_operator (tree);
 981 extern tree strip_pointer_or_array_types (tree);
 982 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 983
 984 /* This is the basic parsing function.  */
 985 extern void c_parse_file (void);
 986
 987 extern void c_parse_final_cleanups (void);
 988
 989 /* This initializes for preprocess-only mode.  */
 990 extern void c_init_preprocess (void);
 991
 992 /* These macros provide convenient access to the various _STMT nodes.  */
 993
 994 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 995    if a statement expression.  */
 996 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 997   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 998
 999 /* Nonzero if a label has been added to the statement list.  */
1000 #define STATEMENT_LIST_HAS_LABEL(NODE) \
1001   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
1002
1003 /* C_MAYBE_CONST_EXPR accessors.  */
1004 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
1005   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
1006 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
1007   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
1008 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
1009   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
1010 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
1011   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
1012 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
1013   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
1014    && (TREE_CODE (EXPR) == INTEGER_CST                  \
1015        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
1016            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
1017
1018 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
1019 #define DECL_C_BIT_FIELD(NODE) \
1020   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
1021 #define SET_DECL_C_BIT_FIELD(NODE) \
1022   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
1023 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
1024   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
1025
1026 /* True if the decl was an unnamed bitfield.  */
1027 #define DECL_UNNAMED_BIT_FIELD(NODE) \
1028   (DECL_C_BIT_FIELD (NODE) && !DECL_NAME (NODE))
1029
1030 /* True iff TYPE is cv decltype(nullptr).  */
1031 #define NULLPTR_TYPE_P(TYPE) (TREE_CODE (TYPE) == NULLPTR_TYPE)
1032
1033 /* Returns the underlying type of the given enumeration type. The
1034    underlying type is determined in different ways, depending on the
1035    properties of the enum:
1036
1037      - In C++0x or C23, the underlying type can be explicitly specified, e.g.,
1038
1039          enum E1 : char { ... } // underlying type is char
1040
1041      - In a C++0x scoped enumeration, the underlying type is int
1042        unless otherwises specified:
1043
1044          enum class E2 { ... } // underlying type is int
1045
1046      - Otherwise, the underlying type is determined based on the
1047        values of the enumerators. In this case, the
1048        ENUM_UNDERLYING_TYPE will not be set until after the definition
1049        of the enumeration is completed by finish_enum.  */
1050 #define ENUM_UNDERLYING_TYPE(TYPE) \
1051   TREE_TYPE (ENUMERAL_TYPE_CHECK (TYPE))
1052
1053 /* Determines whether an ENUMERAL_TYPE has an explicit
1054    underlying type.  */
1055 #define ENUM_FIXED_UNDERLYING_TYPE_P(NODE) (TYPE_LANG_FLAG_5 (NODE))
1056
1057 extern tree do_case (location_t, tree, tree, tree);
1058 extern tree build_stmt (location_t, enum tree_code, ...);
1059 extern tree build_real_imag_expr (location_t, enum tree_code, tree);
1060
1061 /* These functions must be defined by each front-end which implements
1062    a variant of the C language.  They are used in c-common.cc.  */
1063
1064 extern tree build_unary_op (location_t, enum tree_code, tree, bool);
1065 extern tree build_binary_op (location_t, enum tree_code, tree, tree, bool);
1066 extern tree perform_integral_promotions (tree);
1067
1068 /* These functions must be defined by each front-end which implements
1069    a variant of the C language.  They are used by port files.  */
1070
1071 extern tree default_conversion (tree);
1072
1073 /* Given two integer or real types, return the type for their sum.
1074    Given two compatible ANSI C types, returns the merged type.  */
1075
1076 extern tree common_type (tree, tree);
1077
1078 extern tree decl_constant_value (tree);
1079
1080 /* Handle increment and decrement of boolean types.  */
1081 extern tree boolean_increment (enum tree_code, tree);
1082
1083 extern int case_compare (splay_tree_key, splay_tree_key);
1084
1085 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree,
1086                               tree = NULL_TREE);
1087 extern bool c_switch_covers_all_cases_p (splay_tree, tree);
1088 extern bool c_block_may_fallthru (const_tree);
1089
1090 extern tree build_function_call (location_t, tree, tree);
1091
1092 extern tree build_function_call_vec (location_t, vec<location_t>, tree,
1093                                      vec<tree, va_gc> *, vec<tree, va_gc> *,
1094                                      tree = NULL_TREE);
1095
1096 extern tree resolve_overloaded_builtin (location_t, tree, vec<tree, va_gc> *);
1097
1098 extern tree finish_label_address_expr (tree, location_t);
1099
1100 /* Same function prototype, but the C and C++ front ends have
1101    different implementations.  Used in c-common.cc.  */
1102 extern tree lookup_label (tree);
1103 extern tree lookup_name (tree);
1104 extern bool lvalue_p (const_tree);
1105 extern int maybe_adjust_arg_pos_for_attribute (const_tree);
1106 extern bool instantiation_dependent_expression_p (tree);
1107
1108 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
1109 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
1110 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree, bool = true);
1111 extern tree c_build_shufflevector (location_t, tree, tree,
1112                                    const vec<tree> &, bool = true);
1113 extern tree c_build_vec_convert (location_t, tree, location_t, tree, bool = true);
1114
1115 extern void init_c_lex (void);
1116
1117 extern void c_cpp_builtins (cpp_reader *);
1118 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
1119 extern bool c_cpp_diagnostic (cpp_reader *, enum cpp_diagnostic_level,
1120                               enum cpp_warning_reason, rich_location *,
1121                               const char *, va_list *)
1122      ATTRIBUTE_GCC_DIAG(5,0);
1123 extern int c_common_has_attribute (cpp_reader *, bool);
1124 extern int c_common_has_builtin (cpp_reader *);
1125 extern int c_common_has_feature (cpp_reader *, bool);
1126
1127 /* Implemented by each front end in *-lang.cc.  */
1128 extern void c_family_register_lang_features ();
1129
1130 /* Implemented in c-family/c-common.cc.  */
1131 extern void c_common_register_feature (const char *, bool);
1132 extern bool has_feature_p (const char *, bool);
1133
1134 extern bool parse_optimize_options (tree, bool);
1135
1136 /* Positive if an implicit `extern "C"' scope has just been entered;
1137    negative if such a scope has just been exited.  */
1138 extern GTY(()) int pending_lang_change;
1139
1140 /* Information recorded about each file examined during compilation.  */
1141
1142 struct c_fileinfo
1143 {
1144   int time;     /* Time spent in the file.  */
1145
1146   /* Flags used only by C++.
1147      INTERFACE_ONLY nonzero means that we are in an "interface" section
1148      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
1149      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
1150      INTERFACE_ONLY is zero, it means that we are responsible for
1151      exporting definitions that others might need.  */
1152   short interface_only;
1153   short interface_unknown;
1154 };
1155
1156 struct c_fileinfo *get_fileinfo (const char *);
1157 extern void dump_time_statistics (void);
1158
1159 extern bool c_dump_tree (void *, tree);
1160
1161 extern void verify_sequence_points (tree);
1162
1163 extern tree fold_offsetof (tree, tree = size_type_node,
1164                            tree_code ctx = ERROR_MARK);
1165
1166 extern int complete_array_type (tree *, tree, bool);
1167 extern void complete_flexible_array_elts (tree);
1168
1169 extern tree builtin_type_for_size (int, bool);
1170
1171 extern void c_common_mark_addressable_vec (tree);
1172
1173 extern void set_underlying_type (tree);
1174 extern bool user_facing_original_type_p (const_tree);
1175 extern void record_types_used_by_current_var_decl (tree);
1176 extern vec<tree, va_gc> *make_tree_vector (void);
1177 extern void release_tree_vector (vec<tree, va_gc> *);
1178 extern vec<tree, va_gc> *make_tree_vector_single (tree);
1179 extern vec<tree, va_gc> *make_tree_vector_from_list (tree);
1180 extern vec<tree, va_gc> *make_tree_vector_from_ctor (tree);
1181 extern vec<tree, va_gc> *make_tree_vector_copy (const vec<tree, va_gc> *);
1182
1183 /* Used for communication between c_common_type_for_mode and
1184    c_register_builtin_type.  */
1185 extern GTY(()) tree registered_builtin_types;
1186
1187 /* Read SOURCE_DATE_EPOCH from environment to have a deterministic
1188    timestamp to replace embedded current dates to get reproducible
1189    results.  Returns -1 if SOURCE_DATE_EPOCH is not defined.  */
1190 extern time_t cb_get_source_date_epoch (cpp_reader *pfile);
1191
1192 /* The value (as a unix timestamp) corresponds to date
1193    "Dec 31 9999 23:59:59 UTC", which is the latest date that __DATE__ and
1194    __TIME__ can store.  */
1195 #define MAX_SOURCE_DATE_EPOCH HOST_WIDE_INT_C (253402300799)
1196
1197 /* Callback for libcpp for offering spelling suggestions for misspelled
1198    directives.  */
1199 extern const char *cb_get_suggestion (cpp_reader *, const char *,
1200                                       const char *const *);
1201
1202 extern GTY(()) string_concat_db *g_string_concat_db;
1203
1204 class substring_loc;
1205 extern const char *c_get_substring_location (const substring_loc &substr_loc,
1206                                              location_t *out_loc);
1207
1208 /* In c-gimplify.cc.  */
1209 typedef struct bc_state
1210 {
1211   tree bc_label[2];
1212 } bc_state_t;
1213 extern void save_bc_state (bc_state_t *);
1214 extern void restore_bc_state (bc_state_t *);
1215 extern tree c_genericize_control_stmt (tree *, int *, void *,
1216                                        walk_tree_fn, walk_tree_lh);
1217 extern void c_genericize (tree);
1218 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1219 extern tree c_build_bind_expr (location_t, tree, tree);
1220
1221 /* In c-lex.cc.  */
1222 extern enum cpp_ttype
1223 conflict_marker_get_final_tok_kind (enum cpp_ttype tok1_kind);
1224
1225 /* In c-pch.cc  */
1226 extern void pch_init (void);
1227 extern void pch_cpp_save_state (void);
1228 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1229 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1230                                const char *orig);
1231 extern void c_common_write_pch (void);
1232 extern void c_common_no_more_pch (void);
1233 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1234
1235 /* In *-checksum.c */
1236 extern const unsigned char executable_checksum[16];
1237
1238 /* In c-cppbuiltin.cc  */
1239 extern void builtin_define_std (const char *macro);
1240 extern void builtin_define_with_value (const char *, const char *, int);
1241 extern void builtin_define_with_int_value (const char *, HOST_WIDE_INT);
1242 extern void builtin_define_type_sizeof (const char *, tree);
1243 extern void c_stddef_cpp_builtins (void);
1244 extern void fe_file_change (const line_map_ordinary *);
1245 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char,
1246                            rich_location *richloc);
1247
1248 /* In c-ppoutput.cc  */
1249 extern void init_pp_output (FILE *);
1250 extern void preprocess_file (cpp_reader *);
1251 extern void pp_file_change (const line_map_ordinary *);
1252 extern void pp_dir_change (cpp_reader *, const char *);
1253 extern bool check_missing_format_attribute (tree, tree);
1254 extern void c_pp_stream_token (cpp_reader *, const cpp_token *, location_t loc);
1255
1256 /* In c-omp.cc  */
1257 typedef wide_int_bitmask omp_clause_mask;
1258
1259 #define OMP_CLAUSE_MASK_1 omp_clause_mask (1)
1260
1261 enum c_omp_clause_split
1262 {
1263   C_OMP_CLAUSE_SPLIT_TARGET = 0,
1264   C_OMP_CLAUSE_SPLIT_TEAMS,
1265   C_OMP_CLAUSE_SPLIT_DISTRIBUTE,
1266   C_OMP_CLAUSE_SPLIT_PARALLEL,
1267   C_OMP_CLAUSE_SPLIT_FOR,
1268   C_OMP_CLAUSE_SPLIT_SIMD,
1269   C_OMP_CLAUSE_SPLIT_COUNT,
1270   C_OMP_CLAUSE_SPLIT_SECTIONS = C_OMP_CLAUSE_SPLIT_FOR,
1271   C_OMP_CLAUSE_SPLIT_TASKLOOP = C_OMP_CLAUSE_SPLIT_FOR,
1272   C_OMP_CLAUSE_SPLIT_LOOP = C_OMP_CLAUSE_SPLIT_FOR,
1273   C_OMP_CLAUSE_SPLIT_MASKED = C_OMP_CLAUSE_SPLIT_DISTRIBUTE
1274 };
1275
1276 enum c_omp_region_type
1277 {
1278   C_ORT_OMP                     = 1 << 0,
1279   C_ORT_ACC                     = 1 << 1,
1280   C_ORT_DECLARE_SIMD            = 1 << 2,
1281   C_ORT_TARGET                  = 1 << 3,
1282   C_ORT_EXIT_DATA               = 1 << 4,
1283   C_ORT_OMP_DECLARE_SIMD        = C_ORT_OMP | C_ORT_DECLARE_SIMD,
1284   C_ORT_OMP_TARGET              = C_ORT_OMP | C_ORT_TARGET,
1285   C_ORT_OMP_EXIT_DATA           = C_ORT_OMP | C_ORT_EXIT_DATA,
1286   C_ORT_ACC_TARGET              = C_ORT_ACC | C_ORT_TARGET
1287 };
1288
1289 extern tree c_finish_omp_master (location_t, tree);
1290 extern tree c_finish_omp_masked (location_t, tree, tree);
1291 extern tree c_finish_omp_taskgroup (location_t, tree, tree);
1292 extern tree c_finish_omp_critical (location_t, tree, tree, tree);
1293 extern tree c_finish_omp_ordered (location_t, tree, tree);
1294 extern void c_finish_omp_barrier (location_t);
1295 extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
1296                                  tree, tree, tree, tree, tree, tree, bool,
1297                                  enum omp_memory_order, bool, bool = false);
1298 extern bool c_omp_depend_t_p (tree);
1299 extern void c_finish_omp_depobj (location_t, tree, enum omp_clause_depend_kind,
1300                                  tree);
1301 extern void c_finish_omp_flush (location_t, int);
1302 extern void c_finish_omp_taskwait (location_t);
1303 extern void c_finish_omp_taskyield (location_t);
1304 extern tree c_finish_omp_for (location_t, enum tree_code, tree, tree, tree,
1305                               tree, tree, tree, tree, bool);
1306 extern bool c_omp_check_loop_iv (tree, tree, walk_tree_lh);
1307 extern bool c_omp_check_loop_iv_exprs (location_t, enum tree_code, tree, int,
1308                                        tree, tree, tree, walk_tree_lh);
1309 extern bool c_omp_check_loop_binding_exprs (tree, vec<tree> *);
1310 extern tree c_finish_oacc_wait (location_t, tree, tree);
1311 extern tree c_oacc_split_loop_clauses (tree, tree *, bool);
1312 extern void c_omp_split_clauses (location_t, enum tree_code, omp_clause_mask,
1313                                  tree, tree *);
1314 extern tree c_omp_declare_simd_clauses_to_numbers (tree, tree);
1315 extern void c_omp_declare_simd_clauses_to_decls (tree, tree);
1316 extern bool c_omp_predefined_variable (tree);
1317 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1318 extern enum omp_clause_defaultmap_kind c_omp_predetermined_mapping (tree);
1319 extern tree c_omp_check_context_selector (location_t, tree);
1320 extern void c_omp_mark_declare_variant (location_t, tree, tree);
1321 extern void c_omp_adjust_map_clauses (tree, bool);
1322
1323 namespace omp_addr_tokenizer { struct omp_addr_token; }
1324 typedef omp_addr_tokenizer::omp_addr_token omp_addr_token;
1325
1326 class c_omp_address_inspector
1327 {
1328   location_t loc;
1329   tree root_term;
1330   bool indirections;
1331   int map_supported;
1332
1333 protected:
1334   tree orig;
1335
1336 public:
1337   c_omp_address_inspector (location_t loc, tree t)
1338     : loc (loc), root_term (NULL_TREE), indirections (false),
1339       map_supported (-1), orig (t)
1340     {
1341     }
1342
1343   ~c_omp_address_inspector ()
1344     {
1345     }
1346
1347   virtual bool processing_template_decl_p ()
1348     {
1349       return false;
1350     }
1351
1352   virtual void emit_unmappable_type_notes (tree)
1353     {
1354     }
1355
1356   virtual tree convert_from_reference (tree)
1357     {
1358       gcc_unreachable ();
1359     }
1360
1361   virtual tree build_array_ref (location_t loc, tree arr, tree idx)
1362     {
1363       tree eltype = TREE_TYPE (TREE_TYPE (arr));
1364       return build4_loc (loc, ARRAY_REF, eltype, arr, idx, NULL_TREE,
1365                          NULL_TREE);
1366     }
1367
1368   virtual bool check_clause (tree);
1369   tree get_root_term (bool);
1370
1371   tree unconverted_ref_origin ();
1372   bool component_access_p ();
1373
1374   bool map_supported_p ();
1375
1376   tree get_origin (tree);
1377   tree maybe_unconvert_ref (tree);
1378
1379   bool maybe_zero_length_array_section (tree);
1380
1381   tree expand_array_base (tree, vec<omp_addr_token *> &, tree, unsigned *,
1382                           c_omp_region_type);
1383   tree expand_component_selector (tree, vec<omp_addr_token *> &, tree,
1384                                   unsigned *, c_omp_region_type);
1385   tree expand_map_clause (tree, tree, vec<omp_addr_token *> &,
1386                           c_omp_region_type);
1387 };
1388
1389 enum c_omp_directive_kind {
1390   C_OMP_DIR_STANDALONE,
1391   C_OMP_DIR_CONSTRUCT,
1392   C_OMP_DIR_DECLARATIVE,
1393   C_OMP_DIR_UTILITY,
1394   C_OMP_DIR_INFORMATIONAL
1395 };
1396
1397 struct c_omp_directive {
1398   const char *first, *second, *third;
1399   unsigned int id;
1400   enum c_omp_directive_kind kind;
1401   bool simd;
1402 };
1403
1404 extern const struct c_omp_directive c_omp_directives[];
1405 extern const struct c_omp_directive *c_omp_categorize_directive (const char *,
1406                                                                  const char *,
1407                                                                  const char *);
1408
1409 /* Return next tree in the chain for chain_next walking of tree nodes.  */
1410 inline tree
1411 c_tree_chain_next (tree t)
1412 {
1413   /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1414      kind of object, never a long chain of nodes.  Prefer
1415      TYPE_NEXT_VARIANT for types.  */
1416   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1417     return TYPE_NEXT_VARIANT (t);
1418   /* Otherwise, if there is TREE_CHAIN, return it.  */
1419   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1420     return TREE_CHAIN (t);
1421   return NULL;
1422 }
1423
1424 /* Return the hardbool attribute associated with TYPE, if there is one, provided
1425    that TYPE looks like an enumeral type that might have been set up by
1426    handle_hardbool_attribute.  Return NULL otherwise.
1427
1428    If FALSE_VALUE or TRUE_VALUE are non-NULL and TYPE is a hardened boolean
1429    type, store the corresponding representation values.  */
1430 static inline tree
1431 c_hardbool_type_attr (tree type,
1432                       tree *false_value = NULL, tree *true_value = NULL)
1433 {
1434   if (TREE_CODE (type) != ENUMERAL_TYPE
1435       || TYPE_LANG_SPECIFIC (type))
1436     return NULL_TREE;
1437
1438   return c_hardbool_type_attr_1 (type, false_value, true_value);
1439 }
1440
1441 /* Mask used by tm_stmt_attr.  */
1442 #define TM_STMT_ATTR_OUTER      2
1443 #define TM_STMT_ATTR_ATOMIC     4
1444 #define TM_STMT_ATTR_RELAXED    8
1445
1446 /* Mask used by tm_attr_to_mask and tm_mask_to_attr.  Note that these
1447    are ordered specifically such that more restrictive attributes are
1448    at lower bit positions.  This fact is known by the C++ tm attribute
1449    inheritance code such that least bit extraction (mask & -mask) results
1450    in the most restrictive attribute.  */
1451 #define TM_ATTR_SAFE                    1
1452 #define TM_ATTR_CALLABLE                2
1453 #define TM_ATTR_PURE                    4
1454 #define TM_ATTR_IRREVOCABLE             8
1455 #define TM_ATTR_MAY_CANCEL_OUTER        16
1456
1457 /* A suffix-identifier value doublet that represents user-defined literals
1458    for C++-0x.  */
1459 enum overflow_type {
1460   OT_UNDERFLOW = -1,
1461   OT_NONE,
1462   OT_OVERFLOW
1463 };
1464
1465 struct GTY(()) tree_userdef_literal {
1466   struct tree_base base;
1467   tree suffix_id;
1468   tree value;
1469   tree num_string;
1470   enum overflow_type overflow;
1471 };
1472
1473 #define USERDEF_LITERAL_SUFFIX_ID(NODE) \
1474   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->suffix_id)
1475
1476 #define USERDEF_LITERAL_VALUE(NODE) \
1477   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->value)
1478
1479 #define USERDEF_LITERAL_OVERFLOW(NODE) \
1480   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->overflow)
1481
1482 #define USERDEF_LITERAL_NUM_STRING(NODE) \
1483   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->num_string)
1484
1485 #define USERDEF_LITERAL_TYPE(NODE) \
1486   (TREE_TYPE (USERDEF_LITERAL_VALUE (NODE)))
1487
1488 extern tree build_userdef_literal (tree suffix_id, tree value,
1489                                    enum overflow_type overflow,
1490                                    tree num_string);
1491
1492
1493 /* WHILE_STMT accessors. These give access to the condition of the
1494    while statement and the body of the while statement, respectively.  */
1495 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
1496 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
1497
1498 /* DO_STMT accessors. These give access to the condition of the do
1499    statement and the body of the do statement, respectively.  */
1500 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
1501 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
1502
1503 /* FOR_STMT accessors. These give access to the init statement,
1504    condition, update expression, and body of the for statement,
1505    respectively.  */
1506 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
1507 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
1508 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
1509 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
1510 #define FOR_SCOPE(NODE)         TREE_OPERAND (FOR_STMT_CHECK (NODE), 4)
1511
1512 #define SWITCH_STMT_COND(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
1513 #define SWITCH_STMT_BODY(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
1514 #define SWITCH_STMT_TYPE(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
1515 #define SWITCH_STMT_SCOPE(NODE) TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 3)
1516 /* True if there are case labels for all possible values of switch cond, either
1517    because there is a default: case label or because the case label ranges cover
1518    all values.  */
1519 #define SWITCH_STMT_ALL_CASES_P(NODE) \
1520   TREE_LANG_FLAG_0 (SWITCH_STMT_CHECK (NODE))
1521 /* True if the body of a switch stmt contains no BREAK_STMTs.  */
1522 #define SWITCH_STMT_NO_BREAK_P(NODE) \
1523   TREE_LANG_FLAG_2 (SWITCH_STMT_CHECK (NODE))
1524
1525
1526 /* Nonzero if NODE is the target for genericization of 'break' stmts.  */
1527 #define LABEL_DECL_BREAK(NODE) \
1528   DECL_LANG_FLAG_0 (LABEL_DECL_CHECK (NODE))
1529
1530 /* Nonzero if NODE is the target for genericization of 'continue' stmts.  */
1531 #define LABEL_DECL_CONTINUE(NODE) \
1532   DECL_LANG_FLAG_1 (LABEL_DECL_CHECK (NODE))
1533
1534 extern bool convert_vector_to_array_for_subscript (location_t, tree *, tree);
1535
1536 /* Possibe cases of scalar_to_vector conversion.  */
1537 enum stv_conv {
1538   stv_error,        /* Error occurred.  */
1539   stv_nothing,      /* Nothing happened.  */
1540   stv_firstarg,     /* First argument must be expanded.  */
1541   stv_secondarg     /* Second argument must be expanded.  */
1542 };
1543
1544 extern enum stv_conv scalar_to_vector (location_t loc, enum tree_code code,
1545                                        tree op0, tree op1, bool);
1546
1547 extern tree find_inv_trees (tree *, int *, void *);
1548 extern tree replace_inv_trees (tree *, int *, void *);
1549
1550 extern bool reject_gcc_builtin (const_tree, location_t = UNKNOWN_LOCATION);
1551 extern bool valid_array_size_p (location_t, const_tree, tree, bool = true);
1552 extern void invalid_array_size_error (location_t, cst_size_error,
1553                                       const_tree, const_tree);
1554
1555 /* In c-warn.cc.  */
1556 extern void constant_expression_warning (tree);
1557 extern void constant_expression_error (tree);
1558 extern void overflow_warning (location_t, tree, tree = NULL_TREE);
1559 extern void warn_logical_operator (location_t, enum tree_code, tree,
1560                                    enum tree_code, tree, enum tree_code, tree);
1561 extern void warn_tautological_cmp (const op_location_t &, enum tree_code,
1562                                    tree, tree);
1563 extern void warn_logical_not_parentheses (location_t, enum tree_code, tree,
1564                                           tree);
1565 extern bool warn_if_unused_value (const_tree, location_t, bool = false);
1566 extern bool strict_aliasing_warning (location_t, tree, tree);
1567 extern void sizeof_pointer_memaccess_warning (location_t *, tree,
1568                                               vec<tree, va_gc> *, tree *,
1569                                               bool (*) (tree, tree));
1570 extern void check_main_parameter_types (tree decl);
1571 extern void warnings_for_convert_and_check (location_t, tree, tree, tree);
1572 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree, bool);
1573 extern void warn_for_omitted_condop (location_t, tree);
1574 extern bool warn_for_restrict (unsigned, tree *, unsigned);
1575 extern void warn_for_address_of_packed_member (tree, tree);
1576 extern void warn_parm_array_mismatch (location_t, tree, tree);
1577 extern void maybe_warn_sizeof_array_div (location_t, tree, tree, tree, tree);
1578 extern void do_warn_array_compare (location_t, tree_code, tree, tree);
1579
1580 /* Places where an lvalue, or modifiable lvalue, may be required.
1581    Used to select diagnostic messages in lvalue_error and
1582    readonly_error.  */
1583 enum lvalue_use {
1584   lv_assign,
1585   lv_increment,
1586   lv_decrement,
1587   lv_addressof,
1588   lv_asm
1589 };
1590
1591 extern void lvalue_error (location_t, enum lvalue_use);
1592 extern void invalid_indirection_error (location_t, tree, ref_operator);
1593 extern void readonly_error (location_t, tree, enum lvalue_use);
1594 extern void warn_array_subscript_with_type_char (location_t, tree);
1595 extern void warn_about_parentheses (location_t,
1596                                     enum tree_code,
1597                                     enum tree_code, tree,
1598                                     enum tree_code, tree);
1599 extern void warn_for_unused_label (tree label);
1600 extern void warn_for_div_by_zero (location_t, tree divisor);
1601 extern void warn_for_memset (location_t, tree, tree, int);
1602 extern void warn_for_calloc (location_t *, tree, vec<tree, va_gc> *,
1603                              tree *, tree);
1604 extern void warn_for_alloc_size (location_t, tree, tree, tree);
1605 extern void warn_for_sign_compare (location_t,
1606                                    tree orig_op0, tree orig_op1,
1607                                    tree op0, tree op1,
1608                                    tree result_type,
1609                                    enum tree_code resultcode);
1610 extern void do_warn_double_promotion (tree, tree, tree, const char *,
1611                                       location_t);
1612 extern void do_warn_unused_parameter (tree);
1613 extern void record_locally_defined_typedef (tree);
1614 extern void maybe_record_typedef_use (tree);
1615 extern void maybe_warn_unused_local_typedefs (void);
1616 extern void maybe_warn_bool_compare (location_t, enum tree_code, tree, tree);
1617 extern bool maybe_warn_shift_overflow (location_t, tree, tree);
1618 extern void warn_duplicated_cond_add_or_warn (location_t, tree, vec<tree> **);
1619 extern bool diagnose_mismatched_attributes (tree, tree);
1620 extern tree do_warn_duplicated_branches_r (tree *, int *, void *);
1621 extern void warn_for_multistatement_macros (location_t, location_t,
1622                                             location_t, enum rid);
1623
1624 extern void check_for_xor_used_as_pow (location_t lhs_loc, tree lhs_val,
1625                                        location_t operator_loc,
1626                                        location_t rhs_loc, tree rhs_val);
1627
1628 /* In c-attribs.cc.  */
1629 extern bool attribute_takes_identifier_p (const_tree);
1630 extern tree handle_deprecated_attribute (tree *, tree, tree, int, bool *);
1631 extern tree handle_unused_attribute (tree *, tree, tree, int, bool *);
1632 extern tree handle_fallthrough_attribute (tree *, tree, tree, int, bool *);
1633 extern int parse_tm_stmt_attr (tree, int);
1634 extern int tm_attr_to_mask (tree);
1635 extern tree tm_mask_to_attr (int);
1636 extern tree find_tm_attribute (tree);
1637 extern const struct attribute_spec::exclusions attr_cold_hot_exclusions[];
1638 extern const struct attribute_spec::exclusions attr_noreturn_exclusions[];
1639 extern tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
1640 extern bool has_attribute (location_t, tree, tree, tree (*)(tree));
1641 extern tree build_attr_access_from_parms (tree, bool);
1642
1643 /* In c-format.cc.  */
1644 extern bool valid_format_string_type_p (tree);
1645
1646 /* A bitmap of flags to positional_argument.  */
1647 enum posargflags {
1648   /* Consider positional attribute argument value zero valid.  */
1649   POSARG_ZERO = 1,
1650   /* Consider positional attribute argument value valid if it refers
1651      to the ellipsis (i.e., beyond the last typed argument).  */
1652   POSARG_ELLIPSIS = 2
1653 };
1654
1655 extern tree positional_argument (const_tree, const_tree, tree &, tree_code,
1656                                  int = 0, int = posargflags ());
1657
1658 extern enum flt_eval_method
1659 excess_precision_mode_join (enum flt_eval_method, enum flt_eval_method);
1660
1661 extern int c_flt_eval_method (bool ts18661_p);
1662 extern void add_no_sanitize_value (tree node, unsigned int flags);
1663
1664 extern void maybe_add_include_fixit (rich_location *, const char *, bool);
1665 extern void maybe_suggest_missing_token_insertion (rich_location *richloc,
1666                                                    enum cpp_ttype token_type,
1667                                                    location_t prev_token_loc);
1668 extern tree braced_lists_to_strings (tree, tree);
1669
1670 #if CHECKING_P
1671 namespace selftest {
1672   /* Declarations for specific families of tests within c-family,
1673      by source file, in alphabetical order.  */
1674   extern void c_diagnostic_cc_tests (void);
1675   extern void c_format_cc_tests (void);
1676   extern void c_indentation_cc_tests (void);
1677   extern void c_opt_problem_cc_tests (void);
1678   extern void c_pretty_print_cc_tests (void);
1679   extern void c_spellcheck_cc_tests (void);
1680
1681   /* The entrypoint for running all of the above tests.  */
1682   extern void c_family_tests (void);
1683 } // namespace selftest
1684 #endif /* #if CHECKING_P */
1685
1686 #endif /* ! GCC_C_COMMON_H */