gcc/c-family/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987-2018 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_NONATOMIC,
  89
  90   /* C (reserved and imaginary types not implemented, so any use is a
  91      syntax error) */
  92   RID_IMAGINARY,
  93
  94   /* C */
  95   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  96   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  97   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  98   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  99   RID_SIZEOF,
 100
 101   /* C extensions */
 102   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
 103   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
 104   RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,          RID_BUILTIN_SHUFFLE,
 105   RID_BUILTIN_TGMATH,
 106   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
 107
 108   /* TS 18661-3 keywords, in the same sequence as the TI_* values.  */
 109   RID_FLOAT16,
 110   RID_FLOATN_NX_FIRST = RID_FLOAT16,
 111   RID_FLOAT32,
 112   RID_FLOAT64,
 113   RID_FLOAT128,
 114   RID_FLOAT32X,
 115   RID_FLOAT64X,
 116   RID_FLOAT128X,
 117 #define CASE_RID_FLOATN_NX                                              \
 118   case RID_FLOAT16: case RID_FLOAT32: case RID_FLOAT64: case RID_FLOAT128: \
 119   case RID_FLOAT32X: case RID_FLOAT64X: case RID_FLOAT128X
 120
 121   RID_FRACT, RID_ACCUM, RID_AUTO_TYPE, RID_BUILTIN_CALL_WITH_STATIC_CHAIN,
 122
 123   /* "__GIMPLE", for the GIMPLE-parsing extension to the C frontend. */
 124   RID_GIMPLE,
 125
 126   /* "__PHI", for parsing PHI function in GIMPLE FE.  */
 127   RID_PHI,
 128
 129   /* "__RTL", for the RTL-parsing extension to the C frontend.  */
 130   RID_RTL,
 131
 132   /* C11 */
 133   RID_ALIGNAS, RID_GENERIC,
 134
 135   /* This means to warn that this is a C++ keyword, and then treat it
 136      as a normal identifier.  */
 137   RID_CXX_COMPAT_WARN,
 138
 139   /* GNU transactional memory extension */
 140   RID_TRANSACTION_ATOMIC, RID_TRANSACTION_RELAXED, RID_TRANSACTION_CANCEL,
 141
 142   /* Too many ways of getting the name of a function as a string */
 143   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
 144
 145   /* C++ (some of these are keywords in Objective-C as well, but only
 146      if they appear after a '@') */
 147   RID_BOOL,     RID_WCHAR,    RID_CLASS,
 148   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
 149   RID_TEMPLATE, RID_NULL,     RID_CATCH,
 150   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
 151   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
 152   RID_THIS,     RID_THROW,    RID_TRUE,
 153   RID_TRY,      RID_TYPENAME, RID_TYPEID,
 154   RID_USING,    RID_CHAR16,   RID_CHAR32,
 155
 156   /* casts */
 157   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
 158
 159   /* C++ extensions */
 160   RID_ADDRESSOF,               RID_BASES,
 161   RID_BUILTIN_LAUNDER,         RID_DIRECT_BASES,
 162   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
 163   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
 164   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
 165   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_UNIQUE_OBJ_REPRESENTATIONS,
 166   RID_HAS_VIRTUAL_DESTRUCTOR,
 167   RID_IS_ABSTRACT,             RID_IS_AGGREGATE,
 168   RID_IS_BASE_OF,              RID_IS_CLASS,
 169   RID_IS_EMPTY,                RID_IS_ENUM,
 170   RID_IS_FINAL,                RID_IS_LITERAL_TYPE,
 171   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 172   RID_IS_SAME_AS,
 173   RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,
 174   RID_IS_TRIVIALLY_ASSIGNABLE, RID_IS_TRIVIALLY_CONSTRUCTIBLE,
 175   RID_IS_TRIVIALLY_COPYABLE,
 176   RID_IS_UNION,                RID_UNDERLYING_TYPE,
 177   RID_IS_ASSIGNABLE,           RID_IS_CONSTRUCTIBLE,
 178
 179   /* C++11 */
 180   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 181
 182   /* C++ concepts */
 183   RID_CONCEPT, RID_REQUIRES,
 184
 185   /* C++ transactional memory.  */
 186   RID_ATOMIC_NOEXCEPT, RID_ATOMIC_CANCEL, RID_SYNCHRONIZED,
 187
 188   /* Objective-C ("AT" reserved words - they are only keywords when
 189      they follow '@')  */
 190   RID_AT_ENCODE,   RID_AT_END,
 191   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 192   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 193   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 194   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 195   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 196   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 197   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 198   RID_AT_INTERFACE,
 199   RID_AT_IMPLEMENTATION,
 200
 201   /* Named address support, mapping the keyword to a particular named address
 202      number.  Named address space 0 is reserved for the generic address.  If
 203      there are more than 254 named addresses, the addr_space_t type will need
 204      to be grown from an unsigned char to unsigned short.  */
 205   RID_ADDR_SPACE_0,             /* generic address */
 206   RID_ADDR_SPACE_1,
 207   RID_ADDR_SPACE_2,
 208   RID_ADDR_SPACE_3,
 209   RID_ADDR_SPACE_4,
 210   RID_ADDR_SPACE_5,
 211   RID_ADDR_SPACE_6,
 212   RID_ADDR_SPACE_7,
 213   RID_ADDR_SPACE_8,
 214   RID_ADDR_SPACE_9,
 215   RID_ADDR_SPACE_10,
 216   RID_ADDR_SPACE_11,
 217   RID_ADDR_SPACE_12,
 218   RID_ADDR_SPACE_13,
 219   RID_ADDR_SPACE_14,
 220   RID_ADDR_SPACE_15,
 221
 222   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 223   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 224
 225   /* __intN keywords.  The _N_M here doesn't correspond to the intN
 226      in the keyword; use the bitsize in int_n_t_data_t[M] for that.
 227      For example, if int_n_t_data_t[0].bitsize is 13, then RID_INT_N_0
 228      is for __int13.  */
 229
 230   /* Note that the range to use is RID_FIRST_INT_N through
 231      RID_FIRST_INT_N + NUM_INT_N_ENTS - 1 and c-parser.c has a list of
 232      all RID_INT_N_* in a case statement.  */
 233
 234   RID_INT_N_0,
 235   RID_INT_N_1,
 236   RID_INT_N_2,
 237   RID_INT_N_3,
 238
 239   RID_FIRST_INT_N = RID_INT_N_0,
 240   RID_LAST_INT_N = RID_INT_N_3,
 241
 242   RID_MAX,
 243
 244   RID_FIRST_MODIFIER = RID_STATIC,
 245   RID_LAST_MODIFIER = RID_ONEWAY,
 246
 247   RID_FIRST_CXX11 = RID_CONSTEXPR,
 248   RID_LAST_CXX11 = RID_STATIC_ASSERT,
 249   RID_FIRST_AT = RID_AT_ENCODE,
 250   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 251   RID_FIRST_PQ = RID_IN,
 252   RID_LAST_PQ = RID_ONEWAY,
 253   RID_FIRST_PATTR = RID_GETTER,
 254   RID_LAST_PATTR = RID_NONATOMIC
 255 };
 256
 257 #define OBJC_IS_AT_KEYWORD(rid) \
 258   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 259    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 260
 261 #define OBJC_IS_PQ_KEYWORD(rid) \
 262   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 263    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 264
 265 #define OBJC_IS_PATTR_KEYWORD(rid) \
 266   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 267    (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)
 268
 269 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 270    'class') which are shared in a subtle way between Objective-C and
 271    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 272    finds '@' followed by one of these identifiers (eg, '@class'), it
 273    recognizes the whole as an Objective-C keyword.  If the identifier
 274    is found elsewhere, it follows the rules of the C/C++ language.
 275  */
 276 #define OBJC_IS_CXX_KEYWORD(rid) \
 277   (rid == RID_CLASS || rid == RID_SYNCHRONIZED                  \
 278    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 279    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 280
 281 /* The elements of `ridpointers' are identifier nodes for the reserved
 282    type names and storage classes.  It is indexed by a RID_... value.  */
 283 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 284
 285 /* Standard named or nameless data types of the C compiler.  */
 286
 287 enum c_tree_index
 288 {
 289     CTI_CHAR16_TYPE,
 290     CTI_CHAR32_TYPE,
 291     CTI_WCHAR_TYPE,
 292     CTI_UNDERLYING_WCHAR_TYPE,
 293     CTI_WINT_TYPE,
 294     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 295     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 296     CTI_INTMAX_TYPE,
 297     CTI_UINTMAX_TYPE,
 298     CTI_WIDEST_INT_LIT_TYPE,
 299     CTI_WIDEST_UINT_LIT_TYPE,
 300
 301     /* Types for <stdint.h>, that may not be defined on all
 302        targets.  */
 303     CTI_SIG_ATOMIC_TYPE,
 304     CTI_INT8_TYPE,
 305     CTI_INT16_TYPE,
 306     CTI_INT32_TYPE,
 307     CTI_INT64_TYPE,
 308     CTI_UINT8_TYPE,
 309     CTI_UINT16_TYPE,
 310     CTI_UINT32_TYPE,
 311     CTI_UINT64_TYPE,
 312     CTI_INT_LEAST8_TYPE,
 313     CTI_INT_LEAST16_TYPE,
 314     CTI_INT_LEAST32_TYPE,
 315     CTI_INT_LEAST64_TYPE,
 316     CTI_UINT_LEAST8_TYPE,
 317     CTI_UINT_LEAST16_TYPE,
 318     CTI_UINT_LEAST32_TYPE,
 319     CTI_UINT_LEAST64_TYPE,
 320     CTI_INT_FAST8_TYPE,
 321     CTI_INT_FAST16_TYPE,
 322     CTI_INT_FAST32_TYPE,
 323     CTI_INT_FAST64_TYPE,
 324     CTI_UINT_FAST8_TYPE,
 325     CTI_UINT_FAST16_TYPE,
 326     CTI_UINT_FAST32_TYPE,
 327     CTI_UINT_FAST64_TYPE,
 328     CTI_INTPTR_TYPE,
 329     CTI_UINTPTR_TYPE,
 330
 331     CTI_CHAR_ARRAY_TYPE,
 332     CTI_CHAR16_ARRAY_TYPE,
 333     CTI_CHAR32_ARRAY_TYPE,
 334     CTI_WCHAR_ARRAY_TYPE,
 335     CTI_STRING_TYPE,
 336     CTI_CONST_STRING_TYPE,
 337
 338     /* Type for boolean expressions (bool in C++, int in C).  */
 339     CTI_TRUTHVALUE_TYPE,
 340     CTI_TRUTHVALUE_TRUE,
 341     CTI_TRUTHVALUE_FALSE,
 342
 343     CTI_DEFAULT_FUNCTION_TYPE,
 344
 345     /* These are not types, but we have to look them up all the time.  */
 346     CTI_FUNCTION_NAME_DECL,
 347     CTI_PRETTY_FUNCTION_NAME_DECL,
 348     CTI_C99_FUNCTION_NAME_DECL,
 349     CTI_SAVED_FUNCTION_NAME_DECLS,
 350
 351     CTI_NULL,
 352
 353     CTI_MAX
 354 };
 355
 356 #define C_CPP_HASHNODE(id) \
 357   (&(((struct c_common_identifier *) (id))->node))
 358 #define C_RID_CODE(id) \
 359   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 360 #define C_SET_RID_CODE(id, code) \
 361   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 362
 363 /* Identifier part common to the C front ends.  Inherits from
 364    tree_identifier, despite appearances.  */
 365 struct GTY(()) c_common_identifier {
 366   struct tree_common common;
 367   struct cpp_hashnode node;
 368 };
 369
 370 /* An entry in the reserved keyword table.  */
 371
 372 struct c_common_resword
 373 {
 374   const char *const word;
 375   ENUM_BITFIELD(rid) const rid : 16;
 376   const unsigned int disable   : 16;
 377 };
 378
 379 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 380
 381 extern machine_mode c_default_pointer_mode;
 382
 383 /* Extra cpp_ttype values for C++.  */
 384
 385 /* A token type for template-ids.  If a template-id is processed while
 386    parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
 387    the value of the CPP_TEMPLATE_ID is whatever was returned by
 388    cp_parser_template_id.  */
 389 #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
 390
 391 /* A token type for nested-name-specifiers.  If a
 392    nested-name-specifier is processed while parsing tentatively, it is
 393    replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
 394    CPP_NESTED_NAME_SPECIFIER is whatever was returned by
 395    cp_parser_nested_name_specifier_opt.  */
 396 #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
 397
 398 /* A token type for pre-parsed C++0x decltype.  */
 399 #define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
 400
 401 /* A token type for pre-parsed primary-expression (lambda- or statement-).  */
 402 #define CPP_PREPARSED_EXPR ((enum cpp_ttype) (CPP_DECLTYPE + 1))
 403
 404 /* The number of token types, including C++-specific ones.  */
 405 #define N_CP_TTYPES ((int) (CPP_PREPARSED_EXPR + 1))
 406
 407 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 408    mask) is _true_.  Thus for keywords which are present in all
 409    languages the disable field is zero.  */
 410
 411 #define D_CONLY         0x001   /* C only (not in C++).  */
 412 #define D_CXXONLY       0x002   /* C++ only (not in C).  */
 413 #define D_C99           0x004   /* In C, C99 only.  */
 414 #define D_CXX11         0x008   /* In C++, C++11 only.  */
 415 #define D_EXT           0x010   /* GCC extension.  */
 416 #define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
 417 #define D_ASM           0x040   /* Disabled by -fno-asm.  */
 418 #define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
 419 #define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
 420 #define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
 421 #define D_CXX_CONCEPTS  0x400   /* In C++, only with concepts. */
 422 #define D_TRANSMEM      0X800   /* C++ transactional memory TS.  */
 423
 424 #define D_CXX_CONCEPTS_FLAGS D_CXXONLY | D_CXX_CONCEPTS
 425
 426 /* The reserved keyword table.  */
 427 extern const struct c_common_resword c_common_reswords[];
 428
 429 /* The number of items in the reserved keyword table.  */
 430 extern const unsigned int num_c_common_reswords;
 431
 432 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 433 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 434 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 435 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 436 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 437 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 438 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 439 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 440 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 441 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 442 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 443
 444 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 445 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 446 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 447 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 448 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 449 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 450 #define c_uint16_type_node              c_global_trees[CTI_UINT16_TYPE]
 451 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 452 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 453 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 454 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 455 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 456 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 457 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 458 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 459 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 460 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 461 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 462 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 463 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 464 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 465 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 466 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 467 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 468 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 469 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 470 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 471
 472 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 473 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 474 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 475
 476 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 477 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 478 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 479 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 480 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 481 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 482
 483 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 484
 485 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 486 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 487 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 488 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 489
 490 /* The node for C++ `__null'.  */
 491 #define null_node                       c_global_trees[CTI_NULL]
 492
 493 extern GTY(()) tree c_global_trees[CTI_MAX];
 494
 495 /* Mark which labels are explicitly declared.
 496    These may be shadowed, and may be referenced from nested functions.  */
 497 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 498
 499 enum c_language_kind
 500 {
 501   clk_c         = 0,            /* C90, C94, C99, C11 or C2X */
 502   clk_objc      = 1,            /* clk_c with ObjC features.  */
 503   clk_cxx       = 2,            /* ANSI/ISO C++ */
 504   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 505 };
 506
 507 /* To test for a specific language use c_language, defined by each
 508    front end.  For "ObjC features" or "not C++" use the macros.  */
 509 extern c_language_kind c_language;
 510
 511 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 512 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 513
 514 /* The various name of operator that appears in error messages. */
 515 enum ref_operator {
 516   /* NULL */
 517   RO_NULL,
 518   /* array indexing */
 519   RO_ARRAY_INDEXING,
 520   /* unary * */
 521   RO_UNARY_STAR,
 522   /* -> */
 523   RO_ARROW,
 524   /* implicit conversion */
 525   RO_IMPLICIT_CONVERSION,
 526   /* ->* */
 527   RO_ARROW_STAR
 528 };
 529
 530 /* Information about a statement tree.  */
 531
 532 struct GTY(()) stmt_tree_s {
 533   /* A stack of statement lists being collected.  */
 534   vec<tree, va_gc> *x_cur_stmt_list;
 535
 536   /* In C++, Nonzero if we should treat statements as full
 537      expressions.  In particular, this variable is non-zero if at the
 538      end of a statement we should destroy any temporaries created
 539      during that statement.  Similarly, if, at the end of a block, we
 540      should destroy any local variables in this block.  Normally, this
 541      variable is nonzero, since those are the normal semantics of
 542      C++.
 543
 544      This flag has no effect in C.  */
 545   int stmts_are_full_exprs_p;
 546 };
 547
 548 typedef struct stmt_tree_s *stmt_tree;
 549
 550 /* Global state pertinent to the current function.  Some C dialects
 551    extend this structure with additional fields.  */
 552
 553 struct GTY(()) c_language_function {
 554   /* While we are parsing the function, this contains information
 555      about the statement-tree that we are building.  */
 556   struct stmt_tree_s x_stmt_tree;
 557
 558   /* Vector of locally defined typedefs, for
 559      -Wunused-local-typedefs.  */
 560   vec<tree, va_gc> *local_typedefs;
 561 };
 562
 563 #define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
 564
 565 /* When building a statement-tree, this is the current statement list
 566    being collected.  */
 567 #define cur_stmt_list   (stmt_list_stack->last ())
 568
 569 #define building_stmt_list_p() (stmt_list_stack && !stmt_list_stack->is_empty())
 570
 571 /* Language-specific hooks.  */
 572
 573 /* If non-NULL, this function is called after a precompile header file
 574    is loaded.  */
 575 extern void (*lang_post_pch_load) (void);
 576
 577 extern void push_file_scope (void);
 578 extern void pop_file_scope (void);
 579 extern stmt_tree current_stmt_tree (void);
 580 extern tree push_stmt_list (void);
 581 extern tree pop_stmt_list (tree);
 582 extern tree add_stmt (tree);
 583 extern void push_cleanup (tree, tree, bool);
 584
 585 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 586                                location_t, tree, tree);
 587 extern tree build_indirect_ref (location_t, tree, ref_operator);
 588
 589 extern bool has_c_linkage (const_tree decl);
 590 extern bool c_decl_implicit (const_tree);
 591 \f
 592 /* Switches common to the C front ends.  */
 593
 594 /* Nonzero means don't output line number information.  */
 595
 596 extern char flag_no_line_commands;
 597
 598 /* Nonzero causes -E output not to be done, but directives such as
 599    #define that have side effects are still obeyed.  */
 600
 601 extern char flag_no_output;
 602
 603 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 604    'N' or 'U' of the command line switch.  */
 605
 606 extern char flag_dump_macros;
 607
 608 /* Nonzero means pass #include lines through to the output.  */
 609
 610 extern char flag_dump_includes;
 611
 612 /* Nonzero means process PCH files while preprocessing.  */
 613
 614 extern bool flag_pch_preprocess;
 615
 616 /* The file name to which we should write a precompiled header, or
 617    NULL if no header will be written in this compile.  */
 618
 619 extern const char *pch_file;
 620
 621 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 622    user's namespace.  */
 623
 624 extern int flag_iso;
 625
 626 /* C/ObjC language option variables.  */
 627
 628
 629 /* Nonzero means allow type mismatches in conditional expressions;
 630    just make their values `void'.  */
 631
 632 extern int flag_cond_mismatch;
 633
 634 /* Nonzero means enable C89 Amendment 1 features.  */
 635
 636 extern int flag_isoc94;
 637
 638 /* Nonzero means use the ISO C99 (or later) dialect of C.  */
 639
 640 extern int flag_isoc99;
 641
 642 /* Nonzero means use the ISO C11 (or later) dialect of C.  */
 643
 644 extern int flag_isoc11;
 645
 646 /* Nonzero means use the ISO C2X dialect of C.  */
 647
 648 extern int flag_isoc2x;
 649
 650 /* Nonzero means that we have builtin functions, and main is an int.  */
 651
 652 extern int flag_hosted;
 653
 654 /* ObjC language option variables.  */
 655
 656
 657 /* Tells the compiler that this is a special run.  Do not perform any
 658    compiling, instead we are to test some platform dependent features
 659    and output a C header file with appropriate definitions.  */
 660
 661 extern int print_struct_values;
 662
 663 /* Tells the compiler what is the constant string class for ObjC.  */
 664
 665 extern const char *constant_string_class_name;
 666
 667
 668 /* C++ language option variables.  */
 669
 670 /* The reference version of the ABI for -Wabi.  */
 671
 672 extern int warn_abi_version;
 673
 674 /* Return TRUE if one of {flag_abi_version,flag_abi_compat_version} is
 675    less than N and the other is at least N.  */
 676 #define abi_compat_version_crosses(N)           \
 677   (abi_version_at_least(N)                      \
 678    != (flag_abi_compat_version == 0             \
 679        || flag_abi_compat_version >= (N)))
 680
 681 /* Return TRUE if one of {flag_abi_version,warn_abi_version} is
 682    less than N and the other is at least N, for use by -Wabi.  */
 683 #define abi_version_crosses(N)                  \
 684   (abi_version_at_least(N)                      \
 685    != (warn_abi_version == 0                    \
 686        || warn_abi_version >= (N)))
 687
 688 /* Nonzero means generate separate instantiation control files and
 689    juggle them at link time.  */
 690
 691 extern int flag_use_repository;
 692
 693 /* The supported C++ dialects.  */
 694
 695 enum cxx_dialect {
 696   cxx_unset,
 697   /* C++98 with TC1  */
 698   cxx98,
 699   cxx03 = cxx98,
 700   /* C++11  */
 701   cxx0x,
 702   cxx11 = cxx0x,
 703   /* C++14 */
 704   cxx14,
 705   /* C++17 */
 706   cxx17,
 707   /* C++2a (C++20?) */
 708   cxx2a
 709 };
 710
 711 /* The C++ dialect being used. C++98 is the default.  */
 712 extern enum cxx_dialect cxx_dialect;
 713
 714 /* Maximum template instantiation depth.  This limit is rather
 715    arbitrary, but it exists to limit the time it takes to notice
 716    excessively recursive template instantiations.  */
 717
 718 extern int max_tinst_depth;
 719
 720 /* Nonzero means that we should not issue warnings about problems that
 721    occur when the code is executed, because the code being processed
 722    is not expected to be executed.  This is set during parsing.  This
 723    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 724    not a bool, because unexecuted expressions can nest.  */
 725
 726 extern int c_inhibit_evaluation_warnings;
 727
 728 /* Whether lexing has been completed, so subsequent preprocessor
 729    errors should use the compiler's input_location.  */
 730
 731 extern bool done_lexing;
 732
 733 /* C types are partitioned into three subsets: object, function, and
 734    incomplete types.  */
 735 #define C_TYPE_OBJECT_P(type) \
 736   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 737
 738 #define C_TYPE_INCOMPLETE_P(type) \
 739   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 740
 741 #define C_TYPE_FUNCTION_P(type) \
 742   (TREE_CODE (type) == FUNCTION_TYPE)
 743
 744 /* For convenience we define a single macro to identify the class of
 745    object or incomplete types.  */
 746 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 747   (!C_TYPE_FUNCTION_P (type))
 748
 749 struct visibility_flags
 750 {
 751   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 752   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 753 };
 754
 755 /* These enumerators are possible types of unsafe conversions.  */
 756 enum conversion_safety {
 757   /* The conversion is safe.  */
 758   SAFE_CONVERSION = 0,
 759   /* Another type of conversion with problems.  */
 760   UNSAFE_OTHER,
 761   /* Conversion between signed and unsigned integers
 762      which are all warned about immediately, so this is unused.  */
 763   UNSAFE_SIGN,
 764   /* Conversions that reduce the precision of reals including conversions
 765      from reals to integers.  */
 766   UNSAFE_REAL,
 767   /* Conversions from complex to reals or integers, that discard imaginary
 768      component.  */
 769   UNSAFE_IMAGINARY
 770 };
 771
 772 /* Global visibility options.  */
 773 extern struct visibility_flags visibility_options;
 774
 775 /* Attribute table common to the C front ends.  */
 776 extern const struct attribute_spec c_common_attribute_table[];
 777 extern const struct attribute_spec c_common_format_attribute_table[];
 778
 779 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 780    ID is the identifier to use, NAME is the string.
 781    TYPE_DEP indicates whether it depends on type of the function or not
 782    (i.e. __PRETTY_FUNCTION__).  */
 783
 784 extern tree (*make_fname_decl) (location_t, tree, int);
 785
 786 /* In c-decl.c and cp/tree.c.  FIXME.  */
 787 extern void c_register_addr_space (const char *str, addr_space_t as);
 788
 789 /* In c-common.c.  */
 790 extern bool in_late_binary_op;
 791 extern const char *c_addr_space_name (addr_space_t as);
 792 extern tree identifier_global_value (tree);
 793 extern tree c_linkage_bindings (tree);
 794 extern void record_builtin_type (enum rid, const char *, tree);
 795 extern tree build_void_list_node (void);
 796 extern void start_fname_decls (void);
 797 extern void finish_fname_decls (void);
 798 extern const char *fname_as_string (int);
 799 extern tree fname_decl (location_t, unsigned, tree);
 800
 801 extern int check_user_alignment (const_tree, bool, bool);
 802 extern bool check_function_arguments (location_t loc, const_tree, const_tree,
 803                                       int, tree *, vec<location_t> *);
 804 extern void check_function_arguments_recurse (void (*)
 805                                               (void *, tree,
 806                                                unsigned HOST_WIDE_INT),
 807                                               void *, tree,
 808                                               unsigned HOST_WIDE_INT);
 809 extern bool check_builtin_function_arguments (location_t, vec<location_t>,
 810                                               tree, int, tree *);
 811 extern void check_function_format (const_tree, tree, int, tree *,
 812                                    vec<location_t> *);
 813 extern bool attribute_fallthrough_p (tree);
 814 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 815 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 816 extern bool c_common_handle_option (size_t, const char *, HOST_WIDE_INT, int,
 817                                     location_t,
 818                                     const struct cl_option_handlers *);
 819 extern bool default_handle_c_option (size_t, const char *, int);
 820 extern tree c_common_type_for_mode (machine_mode, int);
 821 extern tree c_common_type_for_size (unsigned int, int);
 822 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 823                                                 int, int);
 824 extern tree c_common_unsigned_type (tree);
 825 extern tree c_common_signed_type (tree);
 826 extern tree c_common_signed_or_unsigned_type (int, tree);
 827 extern void c_common_init_ts (void);
 828 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 829 extern enum conversion_safety unsafe_conversion_p (location_t, tree, tree, tree,
 830                                                    bool);
 831 extern bool decl_with_nonnull_addr_p (const_tree);
 832 extern tree c_fully_fold (tree, bool, bool *, bool = false);
 833 extern tree c_wrap_maybe_const (tree, bool);
 834 extern tree c_common_truthvalue_conversion (location_t, tree);
 835 extern void c_apply_type_quals_to_decl (int, tree);
 836 extern tree c_sizeof_or_alignof_type (location_t, tree, bool, bool, int);
 837 extern tree c_alignof_expr (location_t, tree);
 838 /* Print an error message for invalid operands to arith operation CODE.
 839    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 840 extern void binary_op_error (rich_location *, enum tree_code, tree, tree);
 841 extern tree fix_string_type (tree);
 842 extern tree convert_and_check (location_t, tree, tree);
 843 extern bool c_determine_visibility (tree);
 844 extern bool vector_types_compatible_elements_p (tree, tree);
 845 extern void mark_valid_location_for_stdc_pragma (bool);
 846 extern bool valid_location_for_stdc_pragma_p (void);
 847 extern void set_float_const_decimal64 (void);
 848 extern void clear_float_const_decimal64 (void);
 849 extern bool float_const_decimal64_p (void);
 850
 851 extern bool keyword_begins_type_specifier (enum rid);
 852 extern bool keyword_is_storage_class_specifier (enum rid);
 853 extern bool keyword_is_type_qualifier (enum rid);
 854 extern bool keyword_is_decl_specifier (enum rid);
 855 extern unsigned max_align_t_align (void);
 856 extern bool cxx_fundamental_alignment_p (unsigned);
 857 extern bool pointer_to_zero_sized_aggr_p (tree);
 858 extern bool bool_promoted_to_int_p (tree);
 859 extern tree fold_for_warn (tree);
 860 extern tree c_common_get_narrower (tree, int *);
 861 extern bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *);
 862
 863 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, false, 1)
 864 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, false, 1)
 865
 866 /* Subroutine of build_binary_op, used for certain operations.  */
 867 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 868
 869 /* Subroutine of build_binary_op, used for comparison operations.
 870    See if the operands have both been converted from subword integer types
 871    and, if so, perhaps change them both back to their original type.  */
 872 extern tree shorten_compare (location_t, tree *, tree *, tree *,
 873                              enum tree_code *);
 874
 875 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree,
 876                              bool = true);
 877
 878 /* Add qualifiers to a type, in the fashion for C.  */
 879 extern tree c_build_qualified_type (tree, int, tree = NULL_TREE, size_t = 0);
 880
 881 /* Build tree nodes and builtin functions common to both C and C++ language
 882    frontends.  */
 883 extern void c_common_nodes_and_builtins (void);
 884
 885 extern void disable_builtin_function (const char *);
 886
 887 extern void set_compound_literal_name (tree decl);
 888
 889 extern tree build_va_arg (location_t, tree, tree);
 890
 891 extern const unsigned int c_family_lang_mask;
 892 extern unsigned int c_common_option_lang_mask (void);
 893 extern void c_common_diagnostics_set_defaults (diagnostic_context *);
 894 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 895 extern void c_common_init_options_struct (struct gcc_options *);
 896 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 897 extern bool c_common_post_options (const char **);
 898 extern bool c_common_init (void);
 899 extern void c_common_finish (void);
 900 extern void c_common_parse_file (void);
 901 extern FILE *get_dump_info (int, dump_flags_t *);
 902 extern alias_set_type c_common_get_alias_set (tree);
 903 extern void c_register_builtin_type (tree, const char*);
 904 extern bool c_promoting_integer_type_p (const_tree);
 905 extern bool self_promoting_args_p (const_tree);
 906 extern tree strip_pointer_operator (tree);
 907 extern tree strip_pointer_or_array_types (tree);
 908 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 909
 910 /* This is the basic parsing function.  */
 911 extern void c_parse_file (void);
 912
 913 extern void c_parse_final_cleanups (void);
 914
 915 /* These macros provide convenient access to the various _STMT nodes.  */
 916
 917 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 918    if a statement expression.  */
 919 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 920   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 921
 922 /* Nonzero if a label has been added to the statement list.  */
 923 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 924   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 925
 926 /* C_MAYBE_CONST_EXPR accessors.  */
 927 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
 928   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
 929 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
 930   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
 931 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
 932   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 933 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
 934   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 935 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
 936   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
 937    && (TREE_CODE (EXPR) == INTEGER_CST                  \
 938        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
 939            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
 940
 941 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 942 #define DECL_C_BIT_FIELD(NODE) \
 943   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 944 #define SET_DECL_C_BIT_FIELD(NODE) \
 945   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 946 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 947   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 948
 949 /* True if the decl was an unnamed bitfield.  */
 950 #define DECL_UNNAMED_BIT_FIELD(NODE) \
 951   (DECL_C_BIT_FIELD (NODE) && !DECL_NAME (NODE))
 952
 953 extern tree do_case (location_t, tree, tree);
 954 extern tree build_stmt (location_t, enum tree_code, ...);
 955 extern tree build_real_imag_expr (location_t, enum tree_code, tree);
 956
 957 /* These functions must be defined by each front-end which implements
 958    a variant of the C language.  They are used in c-common.c.  */
 959
 960 extern tree build_unary_op (location_t, enum tree_code, tree, bool);
 961 extern tree build_binary_op (location_t, enum tree_code, tree, tree, bool);
 962 extern tree perform_integral_promotions (tree);
 963
 964 /* These functions must be defined by each front-end which implements
 965    a variant of the C language.  They are used by port files.  */
 966
 967 extern tree default_conversion (tree);
 968
 969 /* Given two integer or real types, return the type for their sum.
 970    Given two compatible ANSI C types, returns the merged type.  */
 971
 972 extern tree common_type (tree, tree);
 973
 974 extern tree decl_constant_value (tree);
 975
 976 /* Handle increment and decrement of boolean types.  */
 977 extern tree boolean_increment (enum tree_code, tree);
 978
 979 extern int case_compare (splay_tree_key, splay_tree_key);
 980
 981 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree, tree,
 982                               bool *);
 983 extern bool c_switch_covers_all_cases_p (splay_tree, tree);
 984
 985 extern tree build_function_call (location_t, tree, tree);
 986
 987 extern tree build_function_call_vec (location_t, vec<location_t>, tree,
 988                                      vec<tree, va_gc> *, vec<tree, va_gc> *);
 989
 990 extern tree resolve_overloaded_builtin (location_t, tree, vec<tree, va_gc> *);
 991
 992 extern tree finish_label_address_expr (tree, location_t);
 993
 994 /* Same function prototype, but the C and C++ front ends have
 995    different implementations.  Used in c-common.c.  */
 996 extern tree lookup_label (tree);
 997 extern tree lookup_name (tree);
 998 extern bool lvalue_p (const_tree);
 999
1000 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
1001 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
1002 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree, bool = true);
1003
1004 extern void init_c_lex (void);
1005
1006 extern void c_cpp_builtins (cpp_reader *);
1007 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
1008 extern bool c_cpp_diagnostic (cpp_reader *, enum cpp_diagnostic_level,
1009                               enum cpp_warning_reason, rich_location *,
1010                               const char *, va_list *)
1011      ATTRIBUTE_GCC_DIAG(5,0);
1012 extern int c_common_has_attribute (cpp_reader *);
1013
1014 extern bool parse_optimize_options (tree, bool);
1015
1016 /* Positive if an implicit `extern "C"' scope has just been entered;
1017    negative if such a scope has just been exited.  */
1018 extern GTY(()) int pending_lang_change;
1019
1020 /* Information recorded about each file examined during compilation.  */
1021
1022 struct c_fileinfo
1023 {
1024   int time;     /* Time spent in the file.  */
1025
1026   /* Flags used only by C++.
1027      INTERFACE_ONLY nonzero means that we are in an "interface" section
1028      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
1029      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
1030      INTERFACE_ONLY is zero, it means that we are responsible for
1031      exporting definitions that others might need.  */
1032   short interface_only;
1033   short interface_unknown;
1034 };
1035
1036 struct c_fileinfo *get_fileinfo (const char *);
1037 extern void dump_time_statistics (void);
1038
1039 extern bool c_dump_tree (void *, tree);
1040
1041 extern void verify_sequence_points (tree);
1042
1043 extern tree fold_offsetof (tree, tree = size_type_node,
1044                            tree_code ctx = ERROR_MARK);
1045
1046 extern int complete_array_type (tree *, tree, bool);
1047 extern void complete_flexible_array_elts (tree);
1048
1049 extern tree builtin_type_for_size (int, bool);
1050
1051 extern void c_common_mark_addressable_vec (tree);
1052
1053 extern void set_underlying_type (tree);
1054 extern void record_types_used_by_current_var_decl (tree);
1055 extern vec<tree, va_gc> *make_tree_vector (void);
1056 extern void release_tree_vector (vec<tree, va_gc> *);
1057 extern vec<tree, va_gc> *make_tree_vector_single (tree);
1058 extern vec<tree, va_gc> *make_tree_vector_from_list (tree);
1059 extern vec<tree, va_gc> *make_tree_vector_from_ctor (tree);
1060 extern vec<tree, va_gc> *make_tree_vector_copy (const vec<tree, va_gc> *);
1061
1062 /* Used for communication between c_common_type_for_mode and
1063    c_register_builtin_type.  */
1064 extern GTY(()) tree registered_builtin_types;
1065
1066 /* Read SOURCE_DATE_EPOCH from environment to have a deterministic
1067    timestamp to replace embedded current dates to get reproducible
1068    results.  Returns -1 if SOURCE_DATE_EPOCH is not defined.  */
1069 extern time_t cb_get_source_date_epoch (cpp_reader *pfile);
1070
1071 /* The value (as a unix timestamp) corresponds to date
1072    "Dec 31 9999 23:59:59 UTC", which is the latest date that __DATE__ and
1073    __TIME__ can store.  */
1074 #define MAX_SOURCE_DATE_EPOCH HOST_WIDE_INT_C (253402300799)
1075
1076 /* Callback for libcpp for offering spelling suggestions for misspelled
1077    directives.  */
1078 extern const char *cb_get_suggestion (cpp_reader *, const char *,
1079                                       const char *const *);
1080
1081 extern GTY(()) string_concat_db *g_string_concat_db;
1082
1083 class substring_loc;
1084 extern const char *c_get_substring_location (const substring_loc &substr_loc,
1085                                              location_t *out_loc);
1086
1087 /* In c-gimplify.c  */
1088 extern void c_genericize (tree);
1089 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1090 extern tree c_build_bind_expr (location_t, tree, tree);
1091
1092 /* In c-lex.c.  */
1093 extern enum cpp_ttype
1094 conflict_marker_get_final_tok_kind (enum cpp_ttype tok1_kind);
1095
1096 /* In c-pch.c  */
1097 extern void pch_init (void);
1098 extern void pch_cpp_save_state (void);
1099 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1100 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1101                                const char *orig);
1102 extern void c_common_write_pch (void);
1103 extern void c_common_no_more_pch (void);
1104 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1105
1106 /* In *-checksum.c */
1107 extern const unsigned char executable_checksum[16];
1108
1109 /* In c-cppbuiltin.c  */
1110 extern void builtin_define_std (const char *macro);
1111 extern void builtin_define_with_value (const char *, const char *, int);
1112 extern void builtin_define_with_int_value (const char *, HOST_WIDE_INT);
1113 extern void builtin_define_type_sizeof (const char *, tree);
1114 extern void c_stddef_cpp_builtins (void);
1115 extern void fe_file_change (const line_map_ordinary *);
1116 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char,
1117                            rich_location *richloc);
1118
1119 /* In c-ppoutput.c  */
1120 extern void init_pp_output (FILE *);
1121 extern void preprocess_file (cpp_reader *);
1122 extern void pp_file_change (const line_map_ordinary *);
1123 extern void pp_dir_change (cpp_reader *, const char *);
1124 extern bool check_missing_format_attribute (tree, tree);
1125
1126 /* In c-omp.c  */
1127 typedef wide_int_bitmask omp_clause_mask;
1128
1129 #define OMP_CLAUSE_MASK_1 omp_clause_mask (1)
1130
1131 enum c_omp_clause_split
1132 {
1133   C_OMP_CLAUSE_SPLIT_TARGET = 0,
1134   C_OMP_CLAUSE_SPLIT_TEAMS,
1135   C_OMP_CLAUSE_SPLIT_DISTRIBUTE,
1136   C_OMP_CLAUSE_SPLIT_PARALLEL,
1137   C_OMP_CLAUSE_SPLIT_FOR,
1138   C_OMP_CLAUSE_SPLIT_SIMD,
1139   C_OMP_CLAUSE_SPLIT_COUNT,
1140   C_OMP_CLAUSE_SPLIT_SECTIONS = C_OMP_CLAUSE_SPLIT_FOR,
1141   C_OMP_CLAUSE_SPLIT_TASKLOOP = C_OMP_CLAUSE_SPLIT_FOR
1142 };
1143
1144 enum c_omp_region_type
1145 {
1146   C_ORT_OMP                     = 1 << 0,
1147   C_ORT_ACC                     = 1 << 1,
1148   C_ORT_DECLARE_SIMD            = 1 << 2,
1149   C_ORT_OMP_DECLARE_SIMD        = C_ORT_OMP | C_ORT_DECLARE_SIMD
1150 };
1151
1152 extern tree c_finish_omp_master (location_t, tree);
1153 extern tree c_finish_omp_taskgroup (location_t, tree, tree);
1154 extern tree c_finish_omp_critical (location_t, tree, tree, tree);
1155 extern tree c_finish_omp_ordered (location_t, tree, tree);
1156 extern void c_finish_omp_barrier (location_t);
1157 extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
1158                                  tree, tree, tree, tree, tree, bool,
1159                                  enum omp_memory_order, bool = false);
1160 extern bool c_omp_depend_t_p (tree);
1161 extern void c_finish_omp_depobj (location_t, tree, enum omp_clause_depend_kind,
1162                                  tree);
1163 extern void c_finish_omp_flush (location_t, int);
1164 extern void c_finish_omp_taskwait (location_t);
1165 extern void c_finish_omp_taskyield (location_t);
1166 extern tree c_finish_omp_for (location_t, enum tree_code, tree, tree, tree,
1167                               tree, tree, tree, tree, bool);
1168 extern bool c_omp_check_loop_iv (tree, tree, walk_tree_lh);
1169 extern bool c_omp_check_loop_iv_exprs (location_t, tree, tree, tree, tree,
1170                                        walk_tree_lh);
1171 extern tree c_finish_oacc_wait (location_t, tree, tree);
1172 extern tree c_oacc_split_loop_clauses (tree, tree *, bool);
1173 extern void c_omp_split_clauses (location_t, enum tree_code, omp_clause_mask,
1174                                  tree, tree *);
1175 extern tree c_omp_declare_simd_clauses_to_numbers (tree, tree);
1176 extern void c_omp_declare_simd_clauses_to_decls (tree, tree);
1177 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1178
1179 /* Return next tree in the chain for chain_next walking of tree nodes.  */
1180 static inline tree
1181 c_tree_chain_next (tree t)
1182 {
1183   /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1184      kind of object, never a long chain of nodes.  Prefer
1185      TYPE_NEXT_VARIANT for types.  */
1186   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1187     return TYPE_NEXT_VARIANT (t);
1188   /* Otherwise, if there is TREE_CHAIN, return it.  */
1189   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1190     return TREE_CHAIN (t);
1191   return NULL;
1192 }
1193
1194 /* Mask used by tm_stmt_attr.  */
1195 #define TM_STMT_ATTR_OUTER      2
1196 #define TM_STMT_ATTR_ATOMIC     4
1197 #define TM_STMT_ATTR_RELAXED    8
1198
1199 /* Mask used by tm_attr_to_mask and tm_mask_to_attr.  Note that these
1200    are ordered specifically such that more restrictive attributes are
1201    at lower bit positions.  This fact is known by the C++ tm attribute
1202    inheritance code such that least bit extraction (mask & -mask) results
1203    in the most restrictive attribute.  */
1204 #define TM_ATTR_SAFE                    1
1205 #define TM_ATTR_CALLABLE                2
1206 #define TM_ATTR_PURE                    4
1207 #define TM_ATTR_IRREVOCABLE             8
1208 #define TM_ATTR_MAY_CANCEL_OUTER        16
1209
1210 /* A suffix-identifier value doublet that represents user-defined literals
1211    for C++-0x.  */
1212 enum overflow_type {
1213   OT_UNDERFLOW = -1,
1214   OT_NONE,
1215   OT_OVERFLOW
1216 };
1217
1218 struct GTY(()) tree_userdef_literal {
1219   struct tree_base base;
1220   tree suffix_id;
1221   tree value;
1222   tree num_string;
1223   enum overflow_type overflow;
1224 };
1225
1226 #define USERDEF_LITERAL_SUFFIX_ID(NODE) \
1227   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->suffix_id)
1228
1229 #define USERDEF_LITERAL_VALUE(NODE) \
1230   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->value)
1231
1232 #define USERDEF_LITERAL_OVERFLOW(NODE) \
1233   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->overflow)
1234
1235 #define USERDEF_LITERAL_NUM_STRING(NODE) \
1236   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->num_string)
1237
1238 #define USERDEF_LITERAL_TYPE(NODE) \
1239   (TREE_TYPE (USERDEF_LITERAL_VALUE (NODE)))
1240
1241 extern tree build_userdef_literal (tree suffix_id, tree value,
1242                                    enum overflow_type overflow,
1243                                    tree num_string);
1244
1245 extern bool convert_vector_to_array_for_subscript (location_t, tree *, tree);
1246
1247 /* Possibe cases of scalar_to_vector conversion.  */
1248 enum stv_conv {
1249   stv_error,        /* Error occurred.  */
1250   stv_nothing,      /* Nothing happened.  */
1251   stv_firstarg,     /* First argument must be expanded.  */
1252   stv_secondarg     /* Second argument must be expanded.  */
1253 };
1254
1255 extern enum stv_conv scalar_to_vector (location_t loc, enum tree_code code,
1256                                        tree op0, tree op1, bool);
1257
1258 extern tree find_inv_trees (tree *, int *, void *);
1259 extern tree replace_inv_trees (tree *, int *, void *);
1260
1261 extern bool reject_gcc_builtin (const_tree, location_t = UNKNOWN_LOCATION);
1262 extern bool valid_array_size_p (location_t, tree, tree, bool = true);
1263
1264 /* In c-warn.c.  */
1265 extern void constant_expression_warning (tree);
1266 extern void constant_expression_error (tree);
1267 extern void overflow_warning (location_t, tree, tree = NULL_TREE);
1268 extern void warn_logical_operator (location_t, enum tree_code, tree,
1269                                    enum tree_code, tree, enum tree_code, tree);
1270 extern void warn_tautological_cmp (location_t, enum tree_code, tree, tree);
1271 extern void warn_logical_not_parentheses (location_t, enum tree_code, tree,
1272                                           tree);
1273 extern bool warn_if_unused_value (const_tree, location_t);
1274 extern bool strict_aliasing_warning (location_t, tree, tree);
1275 extern void sizeof_pointer_memaccess_warning (location_t *, tree,
1276                                               vec<tree, va_gc> *, tree *,
1277                                               bool (*) (tree, tree));
1278 extern void check_main_parameter_types (tree decl);
1279 extern void warnings_for_convert_and_check (location_t, tree, tree, tree);
1280 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree, bool,
1281                                   bool);
1282 extern void warn_for_omitted_condop (location_t, tree);
1283 extern bool warn_for_restrict (unsigned, tree *, unsigned);
1284
1285 /* Places where an lvalue, or modifiable lvalue, may be required.
1286    Used to select diagnostic messages in lvalue_error and
1287    readonly_error.  */
1288 enum lvalue_use {
1289   lv_assign,
1290   lv_increment,
1291   lv_decrement,
1292   lv_addressof,
1293   lv_asm
1294 };
1295
1296 extern void lvalue_error (location_t, enum lvalue_use);
1297 extern void invalid_indirection_error (location_t, tree, ref_operator);
1298 extern void readonly_error (location_t, tree, enum lvalue_use);
1299 extern void warn_array_subscript_with_type_char (location_t, tree);
1300 extern void warn_about_parentheses (location_t,
1301                                     enum tree_code,
1302                                     enum tree_code, tree,
1303                                     enum tree_code, tree);
1304 extern void warn_for_unused_label (tree label);
1305 extern void warn_for_div_by_zero (location_t, tree divisor);
1306 extern void warn_for_memset (location_t, tree, tree, int);
1307 extern void warn_for_sign_compare (location_t,
1308                                    tree orig_op0, tree orig_op1,
1309                                    tree op0, tree op1,
1310                                    tree result_type,
1311                                    enum tree_code resultcode);
1312 extern void do_warn_double_promotion (tree, tree, tree, const char *,
1313                                       location_t);
1314 extern void do_warn_unused_parameter (tree);
1315 extern void record_locally_defined_typedef (tree);
1316 extern void maybe_record_typedef_use (tree);
1317 extern void maybe_warn_unused_local_typedefs (void);
1318 extern void maybe_warn_bool_compare (location_t, enum tree_code, tree, tree);
1319 extern bool maybe_warn_shift_overflow (location_t, tree, tree);
1320 extern void warn_duplicated_cond_add_or_warn (location_t, tree, vec<tree> **);
1321 extern bool diagnose_mismatched_attributes (tree, tree);
1322 extern tree do_warn_duplicated_branches_r (tree *, int *, void *);
1323 extern void warn_for_multistatement_macros (location_t, location_t,
1324                                             location_t, enum rid);
1325
1326 /* In c-attribs.c.  */
1327 extern bool attribute_takes_identifier_p (const_tree);
1328 extern tree handle_unused_attribute (tree *, tree, tree, int, bool *);
1329 extern int parse_tm_stmt_attr (tree, int);
1330 extern int tm_attr_to_mask (tree);
1331 extern tree tm_mask_to_attr (int);
1332 extern tree find_tm_attribute (tree);
1333 extern const struct attribute_spec::exclusions attr_cold_hot_exclusions[];
1334
1335 /* A bitmap of flags to positional_argument.  */
1336 enum posargflags {
1337   /* Consider positional attribute argument value zero valid.  */
1338   POSARG_ZERO = 1,
1339   /* Consider positional attribute argument value valid if it refers
1340      to the ellipsis (i.e., beyond the last typed argument).  */
1341   POSARG_ELLIPSIS = 2
1342 };
1343
1344 extern tree positional_argument (const_tree, const_tree, tree, tree_code,
1345                                  int = 0, int = posargflags ());
1346
1347 extern enum flt_eval_method
1348 excess_precision_mode_join (enum flt_eval_method, enum flt_eval_method);
1349
1350 extern int c_flt_eval_method (bool ts18661_p);
1351 extern void add_no_sanitize_value (tree node, unsigned int flags);
1352
1353 extern void maybe_add_include_fixit (rich_location *, const char *, bool);
1354 extern void maybe_suggest_missing_token_insertion (rich_location *richloc,
1355                                                    enum cpp_ttype token_type,
1356                                                    location_t prev_token_loc);
1357 extern tree braced_list_to_string (tree, tree);
1358
1359 #if CHECKING_P
1360 namespace selftest {
1361   /* Declarations for specific families of tests within c-family,
1362      by source file, in alphabetical order.  */
1363   extern void c_format_c_tests (void);
1364   extern void c_indentation_c_tests (void);
1365   extern void c_pretty_print_c_tests (void);
1366   extern void c_spellcheck_cc_tests (void);
1367
1368   /* The entrypoint for running all of the above tests.  */
1369   extern void c_family_tests (void);
1370 } // namespace selftest
1371 #endif /* #if CHECKING_P */
1372
1373 #endif /* ! GCC_C_COMMON_H */