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
  29 /* In order for the format checking to accept the C frontend
  30    diagnostic framework extensions, you must include this file before
  31    diagnostic-core.h, not after.  The C front end formats are a subset of those
  32    for C++, so they are the appropriate set to use in common code;
  33    cp-tree.h overrides this for C++.  */
  34 #if defined(GCC_DIAGNOSTIC_CORE_H)
  35 #error \
  36 In order for the format checking to accept the C front end diagnostic \
  37 framework extensions, you must include this file before diagnostic-core.h \
  38 never after.
  39 #endif
  40 #ifndef GCC_DIAG_STYLE
  41 #define GCC_DIAG_STYLE __gcc_cdiag__
  42 #endif
  43 #include "diagnostic-core.h"
  44
  45 /* Usage of TREE_LANG_FLAG_?:
  46    0: IDENTIFIER_MARKED (used by search routines).
  47       C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)
  48    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  49       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  50       C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)
  51    2: unused
  52    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  53    4: unused
  54 */
  55
  56 /* Reserved identifiers.  This is the union of all the keywords for C,
  57    C++, and Objective-C.  All the type modifiers have to be in one
  58    block at the beginning, because they are used as mask bits.  There
  59    are 28 type modifiers; if we add many more we will have to redesign
  60    the mask mechanism.  */
  61
  62 enum rid
  63 {
  64   /* Modifiers: */
  65   /* C, in empirical order of frequency.  */
  66   RID_STATIC = 0,
  67   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  68   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  69   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  70   RID_NORETURN, RID_ATOMIC,
  71
  72   /* C extensions */
  73   RID_COMPLEX, RID_THREAD, RID_SAT,
  74
  75   /* C++ */
  76   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  77
  78   /* ObjC ("PQ" reserved words - they do not appear after a '@' and
  79      are keywords only in specific contexts)  */
  80   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  81
  82   /* ObjC ("PATTR" reserved words - they do not appear after a '@'
  83      and are keywords only as property attributes)  */
  84   RID_GETTER, RID_SETTER,
  85   RID_READONLY, RID_READWRITE,
  86   RID_ASSIGN, RID_RETAIN, RID_COPY,
  87   RID_NONATOMIC,
  88
  89   /* C (reserved and imaginary types not implemented, so any use is a
  90      syntax error) */
  91   RID_IMAGINARY,
  92
  93   /* C */
  94   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  95   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  96   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  97   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  98   RID_SIZEOF,
  99
 100   /* C extensions */
 101   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
 102   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
 103   RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,          RID_BUILTIN_SHUFFLE,
 104   RID_BUILTIN_TGMATH,
 105   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
 106
 107   /* TS 18661-3 keywords, in the same sequence as the TI_* values.  */
 108   RID_FLOAT16,
 109   RID_FLOATN_NX_FIRST = RID_FLOAT16,
 110   RID_FLOAT32,
 111   RID_FLOAT64,
 112   RID_FLOAT128,
 113   RID_FLOAT32X,
 114   RID_FLOAT64X,
 115   RID_FLOAT128X,
 116 #define CASE_RID_FLOATN_NX                                              \
 117   case RID_FLOAT16: case RID_FLOAT32: case RID_FLOAT64: case RID_FLOAT128: \
 118   case RID_FLOAT32X: case RID_FLOAT64X: case RID_FLOAT128X
 119
 120   RID_FRACT, RID_ACCUM, RID_AUTO_TYPE, RID_BUILTIN_CALL_WITH_STATIC_CHAIN,
 121
 122   /* "__GIMPLE", for the GIMPLE-parsing extension to the C frontend. */
 123   RID_GIMPLE,
 124
 125   /* "__PHI", for parsing PHI function in GIMPLE FE.  */
 126   RID_PHI,
 127
 128   /* "__RTL", for the RTL-parsing extension to the C frontend.  */
 129   RID_RTL,
 130
 131   /* C11 */
 132   RID_ALIGNAS, RID_GENERIC,
 133
 134   /* This means to warn that this is a C++ keyword, and then treat it
 135      as a normal identifier.  */
 136   RID_CXX_COMPAT_WARN,
 137
 138   /* GNU transactional memory extension */
 139   RID_TRANSACTION_ATOMIC, RID_TRANSACTION_RELAXED, RID_TRANSACTION_CANCEL,
 140
 141   /* Too many ways of getting the name of a function as a string */
 142   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
 143
 144   /* C++ (some of these are keywords in Objective-C as well, but only
 145      if they appear after a '@') */
 146   RID_BOOL,     RID_WCHAR,    RID_CLASS,
 147   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
 148   RID_TEMPLATE, RID_NULL,     RID_CATCH,
 149   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
 150   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
 151   RID_THIS,     RID_THROW,    RID_TRUE,
 152   RID_TRY,      RID_TYPENAME, RID_TYPEID,
 153   RID_USING,    RID_CHAR16,   RID_CHAR32,
 154
 155   /* casts */
 156   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
 157
 158   /* C++ extensions */
 159   RID_ADDRESSOF,               RID_BASES,
 160   RID_BUILTIN_LAUNDER,         RID_DIRECT_BASES,
 161   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
 162   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
 163   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
 164   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_UNIQUE_OBJ_REPRESENTATIONS,
 165   RID_HAS_VIRTUAL_DESTRUCTOR,
 166   RID_IS_ABSTRACT,             RID_IS_AGGREGATE,
 167   RID_IS_BASE_OF,              RID_IS_CLASS,
 168   RID_IS_EMPTY,                RID_IS_ENUM,
 169   RID_IS_FINAL,                RID_IS_LITERAL_TYPE,
 170   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 171   RID_IS_SAME_AS,
 172   RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,
 173   RID_IS_TRIVIALLY_ASSIGNABLE, RID_IS_TRIVIALLY_CONSTRUCTIBLE,
 174   RID_IS_TRIVIALLY_COPYABLE,
 175   RID_IS_UNION,                RID_UNDERLYING_TYPE,
 176   RID_IS_ASSIGNABLE,           RID_IS_CONSTRUCTIBLE,
 177
 178   /* C++11 */
 179   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 180
 181   /* C++ concepts */
 182   RID_CONCEPT, RID_REQUIRES,
 183
 184   /* C++ transactional memory.  */
 185   RID_ATOMIC_NOEXCEPT, RID_ATOMIC_CANCEL, RID_SYNCHRONIZED,
 186
 187   /* Objective-C ("AT" reserved words - they are only keywords when
 188      they follow '@')  */
 189   RID_AT_ENCODE,   RID_AT_END,
 190   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 191   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 192   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 193   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 194   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 195   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 196   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 197   RID_AT_INTERFACE,
 198   RID_AT_IMPLEMENTATION,
 199
 200   /* Named address support, mapping the keyword to a particular named address
 201      number.  Named address space 0 is reserved for the generic address.  If
 202      there are more than 254 named addresses, the addr_space_t type will need
 203      to be grown from an unsigned char to unsigned short.  */
 204   RID_ADDR_SPACE_0,             /* generic address */
 205   RID_ADDR_SPACE_1,
 206   RID_ADDR_SPACE_2,
 207   RID_ADDR_SPACE_3,
 208   RID_ADDR_SPACE_4,
 209   RID_ADDR_SPACE_5,
 210   RID_ADDR_SPACE_6,
 211   RID_ADDR_SPACE_7,
 212   RID_ADDR_SPACE_8,
 213   RID_ADDR_SPACE_9,
 214   RID_ADDR_SPACE_10,
 215   RID_ADDR_SPACE_11,
 216   RID_ADDR_SPACE_12,
 217   RID_ADDR_SPACE_13,
 218   RID_ADDR_SPACE_14,
 219   RID_ADDR_SPACE_15,
 220
 221   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 222   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 223
 224   /* __intN keywords.  The _N_M here doesn't correspond to the intN
 225      in the keyword; use the bitsize in int_n_t_data_t[M] for that.
 226      For example, if int_n_t_data_t[0].bitsize is 13, then RID_INT_N_0
 227      is for __int13.  */
 228
 229   /* Note that the range to use is RID_FIRST_INT_N through
 230      RID_FIRST_INT_N + NUM_INT_N_ENTS - 1 and c-parser.c has a list of
 231      all RID_INT_N_* in a case statement.  */
 232
 233   RID_INT_N_0,
 234   RID_INT_N_1,
 235   RID_INT_N_2,
 236   RID_INT_N_3,
 237
 238   RID_FIRST_INT_N = RID_INT_N_0,
 239   RID_LAST_INT_N = RID_INT_N_3,
 240
 241   RID_MAX,
 242
 243   RID_FIRST_MODIFIER = RID_STATIC,
 244   RID_LAST_MODIFIER = RID_ONEWAY,
 245
 246   RID_FIRST_CXX11 = RID_CONSTEXPR,
 247   RID_LAST_CXX11 = RID_STATIC_ASSERT,
 248   RID_FIRST_AT = RID_AT_ENCODE,
 249   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 250   RID_FIRST_PQ = RID_IN,
 251   RID_LAST_PQ = RID_ONEWAY,
 252   RID_FIRST_PATTR = RID_GETTER,
 253   RID_LAST_PATTR = RID_NONATOMIC
 254 };
 255
 256 #define OBJC_IS_AT_KEYWORD(rid) \
 257   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 258    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 259
 260 #define OBJC_IS_PQ_KEYWORD(rid) \
 261   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 262    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 263
 264 #define OBJC_IS_PATTR_KEYWORD(rid) \
 265   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 266    (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)
 267
 268 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 269    'class') which are shared in a subtle way between Objective-C and
 270    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 271    finds '@' followed by one of these identifiers (eg, '@class'), it
 272    recognizes the whole as an Objective-C keyword.  If the identifier
 273    is found elsewhere, it follows the rules of the C/C++ language.
 274  */
 275 #define OBJC_IS_CXX_KEYWORD(rid) \
 276   (rid == RID_CLASS || rid == RID_SYNCHRONIZED                  \
 277    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 278    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 279
 280 /* The elements of `ridpointers' are identifier nodes for the reserved
 281    type names and storage classes.  It is indexed by a RID_... value.  */
 282 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 283
 284 /* Standard named or nameless data types of the C compiler.  */
 285
 286 enum c_tree_index
 287 {
 288     CTI_CHAR16_TYPE,
 289     CTI_CHAR32_TYPE,
 290     CTI_WCHAR_TYPE,
 291     CTI_UNDERLYING_WCHAR_TYPE,
 292     CTI_WINT_TYPE,
 293     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 294     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 295     CTI_INTMAX_TYPE,
 296     CTI_UINTMAX_TYPE,
 297     CTI_WIDEST_INT_LIT_TYPE,
 298     CTI_WIDEST_UINT_LIT_TYPE,
 299
 300     /* Types for <stdint.h>, that may not be defined on all
 301        targets.  */
 302     CTI_SIG_ATOMIC_TYPE,
 303     CTI_INT8_TYPE,
 304     CTI_INT16_TYPE,
 305     CTI_INT32_TYPE,
 306     CTI_INT64_TYPE,
 307     CTI_UINT8_TYPE,
 308     CTI_UINT16_TYPE,
 309     CTI_UINT32_TYPE,
 310     CTI_UINT64_TYPE,
 311     CTI_INT_LEAST8_TYPE,
 312     CTI_INT_LEAST16_TYPE,
 313     CTI_INT_LEAST32_TYPE,
 314     CTI_INT_LEAST64_TYPE,
 315     CTI_UINT_LEAST8_TYPE,
 316     CTI_UINT_LEAST16_TYPE,
 317     CTI_UINT_LEAST32_TYPE,
 318     CTI_UINT_LEAST64_TYPE,
 319     CTI_INT_FAST8_TYPE,
 320     CTI_INT_FAST16_TYPE,
 321     CTI_INT_FAST32_TYPE,
 322     CTI_INT_FAST64_TYPE,
 323     CTI_UINT_FAST8_TYPE,
 324     CTI_UINT_FAST16_TYPE,
 325     CTI_UINT_FAST32_TYPE,
 326     CTI_UINT_FAST64_TYPE,
 327     CTI_INTPTR_TYPE,
 328     CTI_UINTPTR_TYPE,
 329
 330     CTI_CHAR_ARRAY_TYPE,
 331     CTI_CHAR16_ARRAY_TYPE,
 332     CTI_CHAR32_ARRAY_TYPE,
 333     CTI_WCHAR_ARRAY_TYPE,
 334     CTI_STRING_TYPE,
 335     CTI_CONST_STRING_TYPE,
 336
 337     /* Type for boolean expressions (bool in C++, int in C).  */
 338     CTI_TRUTHVALUE_TYPE,
 339     CTI_TRUTHVALUE_TRUE,
 340     CTI_TRUTHVALUE_FALSE,
 341
 342     CTI_DEFAULT_FUNCTION_TYPE,
 343
 344     /* These are not types, but we have to look them up all the time.  */
 345     CTI_FUNCTION_NAME_DECL,
 346     CTI_PRETTY_FUNCTION_NAME_DECL,
 347     CTI_C99_FUNCTION_NAME_DECL,
 348     CTI_SAVED_FUNCTION_NAME_DECLS,
 349
 350     CTI_NULL,
 351
 352     CTI_MAX
 353 };
 354
 355 #define C_CPP_HASHNODE(id) \
 356   (&(((struct c_common_identifier *) (id))->node))
 357 #define C_RID_CODE(id) \
 358   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 359 #define C_SET_RID_CODE(id, code) \
 360   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 361
 362 /* Identifier part common to the C front ends.  Inherits from
 363    tree_identifier, despite appearances.  */
 364 struct GTY(()) c_common_identifier {
 365   struct tree_common common;
 366   struct cpp_hashnode node;
 367 };
 368
 369 /* An entry in the reserved keyword table.  */
 370
 371 struct c_common_resword
 372 {
 373   const char *const word;
 374   ENUM_BITFIELD(rid) const rid : 16;
 375   const unsigned int disable   : 16;
 376 };
 377
 378 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 379
 380 extern machine_mode c_default_pointer_mode;
 381
 382 /* Extra cpp_ttype values for C++.  */
 383
 384 /* A token type for template-ids.  If a template-id is processed while
 385    parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
 386    the value of the CPP_TEMPLATE_ID is whatever was returned by
 387    cp_parser_template_id.  */
 388 #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
 389
 390 /* A token type for nested-name-specifiers.  If a
 391    nested-name-specifier is processed while parsing tentatively, it is
 392    replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
 393    CPP_NESTED_NAME_SPECIFIER is whatever was returned by
 394    cp_parser_nested_name_specifier_opt.  */
 395 #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
 396
 397 /* A token type for pre-parsed C++0x decltype.  */
 398 #define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
 399
 400 /* A token type for pre-parsed primary-expression (lambda- or statement-).  */
 401 #define CPP_PREPARSED_EXPR ((enum cpp_ttype) (CPP_DECLTYPE + 1))
 402
 403 /* The number of token types, including C++-specific ones.  */
 404 #define N_CP_TTYPES ((int) (CPP_PREPARSED_EXPR + 1))
 405
 406 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 407    mask) is _true_.  Thus for keywords which are present in all
 408    languages the disable field is zero.  */
 409
 410 #define D_CONLY         0x001   /* C only (not in C++).  */
 411 #define D_CXXONLY       0x002   /* C++ only (not in C).  */
 412 #define D_C99           0x004   /* In C, C99 only.  */
 413 #define D_CXX11         0x008   /* In C++, C++11 only.  */
 414 #define D_EXT           0x010   /* GCC extension.  */
 415 #define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
 416 #define D_ASM           0x040   /* Disabled by -fno-asm.  */
 417 #define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
 418 #define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
 419 #define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
 420 #define D_CXX_CONCEPTS  0x400   /* In C++, only with concepts. */
 421 #define D_TRANSMEM      0X800   /* C++ transactional memory TS.  */
 422
 423 #define D_CXX_CONCEPTS_FLAGS D_CXXONLY | D_CXX_CONCEPTS
 424
 425 /* The reserved keyword table.  */
 426 extern const struct c_common_resword c_common_reswords[];
 427
 428 /* The number of items in the reserved keyword table.  */
 429 extern const unsigned int num_c_common_reswords;
 430
 431 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 432 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 433 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 434 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 435 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 436 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 437 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 438 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 439 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 440 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 441 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 442
 443 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 444 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 445 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 446 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 447 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 448 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 449 #define c_uint16_type_node              c_global_trees[CTI_UINT16_TYPE]
 450 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 451 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 452 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 453 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 454 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 455 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 456 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 457 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 458 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 459 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 460 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 461 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 462 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 463 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 464 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 465 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 466 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 467 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 468 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 469 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 470
 471 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 472 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 473 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 474
 475 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 476 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 477 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 478 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 479 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 480 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 481
 482 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 483
 484 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 485 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 486 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 487 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 488
 489 /* The node for C++ `__null'.  */
 490 #define null_node                       c_global_trees[CTI_NULL]
 491
 492 extern GTY(()) tree c_global_trees[CTI_MAX];
 493
 494 /* Mark which labels are explicitly declared.
 495    These may be shadowed, and may be referenced from nested functions.  */
 496 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 497
 498 enum c_language_kind
 499 {
 500   clk_c         = 0,            /* C90, C94, C99 or C11 */
 501   clk_objc      = 1,            /* clk_c with ObjC features.  */
 502   clk_cxx       = 2,            /* ANSI/ISO C++ */
 503   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 504 };
 505
 506 /* To test for a specific language use c_language, defined by each
 507    front end.  For "ObjC features" or "not C++" use the macros.  */
 508 extern c_language_kind c_language;
 509
 510 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 511 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 512
 513 /* The various name of operator that appears in error messages. */
 514 enum ref_operator {
 515   /* NULL */
 516   RO_NULL,
 517   /* array indexing */
 518   RO_ARRAY_INDEXING,
 519   /* unary * */
 520   RO_UNARY_STAR,
 521   /* -> */
 522   RO_ARROW,
 523   /* implicit conversion */
 524   RO_IMPLICIT_CONVERSION,
 525   /* ->* */
 526   RO_ARROW_STAR
 527 };
 528
 529 /* Information about a statement tree.  */
 530
 531 struct GTY(()) stmt_tree_s {
 532   /* A stack of statement lists being collected.  */
 533   vec<tree, va_gc> *x_cur_stmt_list;
 534
 535   /* In C++, Nonzero if we should treat statements as full
 536      expressions.  In particular, this variable is non-zero if at the
 537      end of a statement we should destroy any temporaries created
 538      during that statement.  Similarly, if, at the end of a block, we
 539      should destroy any local variables in this block.  Normally, this
 540      variable is nonzero, since those are the normal semantics of
 541      C++.
 542
 543      This flag has no effect in C.  */
 544   int stmts_are_full_exprs_p;
 545 };
 546
 547 typedef struct stmt_tree_s *stmt_tree;
 548
 549 /* Global state pertinent to the current function.  Some C dialects
 550    extend this structure with additional fields.  */
 551
 552 struct GTY(()) c_language_function {
 553   /* While we are parsing the function, this contains information
 554      about the statement-tree that we are building.  */
 555   struct stmt_tree_s x_stmt_tree;
 556
 557   /* Vector of locally defined typedefs, for
 558      -Wunused-local-typedefs.  */
 559   vec<tree, va_gc> *local_typedefs;
 560 };
 561
 562 #define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
 563
 564 /* When building a statement-tree, this is the current statement list
 565    being collected.  */
 566 #define cur_stmt_list   (stmt_list_stack->last ())
 567
 568 #define building_stmt_list_p() (stmt_list_stack && !stmt_list_stack->is_empty())
 569
 570 /* Language-specific hooks.  */
 571
 572 /* If non-NULL, this function is called after a precompile header file
 573    is loaded.  */
 574 extern void (*lang_post_pch_load) (void);
 575
 576 extern void push_file_scope (void);
 577 extern void pop_file_scope (void);
 578 extern stmt_tree current_stmt_tree (void);
 579 extern tree push_stmt_list (void);
 580 extern tree pop_stmt_list (tree);
 581 extern tree add_stmt (tree);
 582 extern void push_cleanup (tree, tree, bool);
 583
 584 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 585                                location_t, tree, tree);
 586 extern tree build_indirect_ref (location_t, tree, ref_operator);
 587
 588 extern bool has_c_linkage (const_tree decl);
 589 extern bool c_decl_implicit (const_tree);
 590 \f
 591 /* Switches common to the C front ends.  */
 592
 593 /* Nonzero means don't output line number information.  */
 594
 595 extern char flag_no_line_commands;
 596
 597 /* Nonzero causes -E output not to be done, but directives such as
 598    #define that have side effects are still obeyed.  */
 599
 600 extern char flag_no_output;
 601
 602 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 603    'N' or 'U' of the command line switch.  */
 604
 605 extern char flag_dump_macros;
 606
 607 /* Nonzero means pass #include lines through to the output.  */
 608
 609 extern char flag_dump_includes;
 610
 611 /* Nonzero means process PCH files while preprocessing.  */
 612
 613 extern bool flag_pch_preprocess;
 614
 615 /* The file name to which we should write a precompiled header, or
 616    NULL if no header will be written in this compile.  */
 617
 618 extern const char *pch_file;
 619
 620 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 621    user's namespace.  */
 622
 623 extern int flag_iso;
 624
 625 /* C/ObjC language option variables.  */
 626
 627
 628 /* Nonzero means allow type mismatches in conditional expressions;
 629    just make their values `void'.  */
 630
 631 extern int flag_cond_mismatch;
 632
 633 /* Nonzero means enable C89 Amendment 1 features.  */
 634
 635 extern int flag_isoc94;
 636
 637 /* Nonzero means use the ISO C99 (or C11) dialect of C.  */
 638
 639 extern int flag_isoc99;
 640
 641 /* Nonzero means use the ISO C11 dialect of C.  */
 642
 643 extern int flag_isoc11;
 644
 645 /* Nonzero means that we have builtin functions, and main is an int.  */
 646
 647 extern int flag_hosted;
 648
 649 /* ObjC language option variables.  */
 650
 651
 652 /* Tells the compiler that this is a special run.  Do not perform any
 653    compiling, instead we are to test some platform dependent features
 654    and output a C header file with appropriate definitions.  */
 655
 656 extern int print_struct_values;
 657
 658 /* Tells the compiler what is the constant string class for ObjC.  */
 659
 660 extern const char *constant_string_class_name;
 661
 662
 663 /* C++ language option variables.  */
 664
 665 /* The reference version of the ABI for -Wabi.  */
 666
 667 extern int warn_abi_version;
 668
 669 /* Return TRUE if one of {flag_abi_version,flag_abi_compat_version} is
 670    less than N and the other is at least N.  */
 671 #define abi_compat_version_crosses(N)           \
 672   (abi_version_at_least(N)                      \
 673    != (flag_abi_compat_version == 0             \
 674        || flag_abi_compat_version >= (N)))
 675
 676 /* Return TRUE if one of {flag_abi_version,warn_abi_version} is
 677    less than N and the other is at least N, for use by -Wabi.  */
 678 #define abi_version_crosses(N)                  \
 679   (abi_version_at_least(N)                      \
 680    != (warn_abi_version == 0                    \
 681        || warn_abi_version >= (N)))
 682
 683 /* Nonzero means generate separate instantiation control files and
 684    juggle them at link time.  */
 685
 686 extern int flag_use_repository;
 687
 688 /* The supported C++ dialects.  */
 689
 690 enum cxx_dialect {
 691   cxx_unset,
 692   /* C++98 with TC1  */
 693   cxx98,
 694   cxx03 = cxx98,
 695   /* C++11  */
 696   cxx0x,
 697   cxx11 = cxx0x,
 698   /* C++14 */
 699   cxx14,
 700   /* C++17 */
 701   cxx17,
 702   /* C++2a (C++20?) */
 703   cxx2a
 704 };
 705
 706 /* The C++ dialect being used. C++98 is the default.  */
 707 extern enum cxx_dialect cxx_dialect;
 708
 709 /* Maximum template instantiation depth.  This limit is rather
 710    arbitrary, but it exists to limit the time it takes to notice
 711    excessively recursive template instantiations.  */
 712
 713 extern int max_tinst_depth;
 714
 715 /* Nonzero means that we should not issue warnings about problems that
 716    occur when the code is executed, because the code being processed
 717    is not expected to be executed.  This is set during parsing.  This
 718    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 719    not a bool, because unexecuted expressions can nest.  */
 720
 721 extern int c_inhibit_evaluation_warnings;
 722
 723 /* Whether lexing has been completed, so subsequent preprocessor
 724    errors should use the compiler's input_location.  */
 725
 726 extern bool done_lexing;
 727
 728 /* C types are partitioned into three subsets: object, function, and
 729    incomplete types.  */
 730 #define C_TYPE_OBJECT_P(type) \
 731   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 732
 733 #define C_TYPE_INCOMPLETE_P(type) \
 734   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 735
 736 #define C_TYPE_FUNCTION_P(type) \
 737   (TREE_CODE (type) == FUNCTION_TYPE)
 738
 739 /* For convenience we define a single macro to identify the class of
 740    object or incomplete types.  */
 741 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 742   (!C_TYPE_FUNCTION_P (type))
 743
 744 struct visibility_flags
 745 {
 746   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 747   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 748 };
 749
 750 /* These enumerators are possible types of unsafe conversions.  */
 751 enum conversion_safety {
 752   /* The conversion is safe.  */
 753   SAFE_CONVERSION = 0,
 754   /* Another type of conversion with problems.  */
 755   UNSAFE_OTHER,
 756   /* Conversion between signed and unsigned integers
 757      which are all warned about immediately, so this is unused.  */
 758   UNSAFE_SIGN,
 759   /* Conversions that reduce the precision of reals including conversions
 760      from reals to integers.  */
 761   UNSAFE_REAL,
 762   /* Conversions from complex to reals or integers, that discard imaginary
 763      component.  */
 764   UNSAFE_IMAGINARY
 765 };
 766
 767 /* Global visibility options.  */
 768 extern struct visibility_flags visibility_options;
 769
 770 /* Attribute table common to the C front ends.  */
 771 extern const struct attribute_spec c_common_attribute_table[];
 772 extern const struct attribute_spec c_common_format_attribute_table[];
 773
 774 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 775    ID is the identifier to use, NAME is the string.
 776    TYPE_DEP indicates whether it depends on type of the function or not
 777    (i.e. __PRETTY_FUNCTION__).  */
 778
 779 extern tree (*make_fname_decl) (location_t, tree, int);
 780
 781 /* In c-decl.c and cp/tree.c.  FIXME.  */
 782 extern void c_register_addr_space (const char *str, addr_space_t as);
 783
 784 /* In c-common.c.  */
 785 extern bool in_late_binary_op;
 786 extern const char *c_addr_space_name (addr_space_t as);
 787 extern tree identifier_global_value (tree);
 788 extern tree c_linkage_bindings (tree);
 789 extern void record_builtin_type (enum rid, const char *, tree);
 790 extern tree build_void_list_node (void);
 791 extern void start_fname_decls (void);
 792 extern void finish_fname_decls (void);
 793 extern const char *fname_as_string (int);
 794 extern tree fname_decl (location_t, unsigned, tree);
 795
 796 extern int check_user_alignment (const_tree, bool);
 797 extern bool check_function_arguments (location_t loc, const_tree, const_tree,
 798                                       int, tree *, vec<location_t> *);
 799 extern void check_function_arguments_recurse (void (*)
 800                                               (void *, tree,
 801                                                unsigned HOST_WIDE_INT),
 802                                               void *, tree,
 803                                               unsigned HOST_WIDE_INT);
 804 extern bool check_builtin_function_arguments (location_t, vec<location_t>,
 805                                               tree, int, tree *);
 806 extern void check_function_format (tree, int, tree *, vec<location_t> *);
 807 extern bool attribute_fallthrough_p (tree);
 808 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 809 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 810 extern bool c_common_handle_option (size_t, const char *, int, int, location_t,
 811                                     const struct cl_option_handlers *);
 812 extern bool default_handle_c_option (size_t, const char *, int);
 813 extern tree c_common_type_for_mode (machine_mode, int);
 814 extern tree c_common_type_for_size (unsigned int, int);
 815 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 816                                                 int, int);
 817 extern tree c_common_unsigned_type (tree);
 818 extern tree c_common_signed_type (tree);
 819 extern tree c_common_signed_or_unsigned_type (int, tree);
 820 extern void c_common_init_ts (void);
 821 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 822 extern enum conversion_safety unsafe_conversion_p (location_t, tree, tree, tree,
 823                                                    bool);
 824 extern bool decl_with_nonnull_addr_p (const_tree);
 825 extern tree c_fully_fold (tree, bool, bool *, bool = false);
 826 extern tree c_wrap_maybe_const (tree, bool);
 827 extern tree c_common_truthvalue_conversion (location_t, tree);
 828 extern void c_apply_type_quals_to_decl (int, tree);
 829 extern tree c_sizeof_or_alignof_type (location_t, tree, bool, bool, int);
 830 extern tree c_alignof_expr (location_t, tree);
 831 /* Print an error message for invalid operands to arith operation CODE.
 832    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 833 extern void binary_op_error (rich_location *, enum tree_code, tree, tree);
 834 extern tree fix_string_type (tree);
 835 extern tree convert_and_check (location_t, tree, tree);
 836 extern bool c_determine_visibility (tree);
 837 extern bool vector_types_compatible_elements_p (tree, tree);
 838 extern void mark_valid_location_for_stdc_pragma (bool);
 839 extern bool valid_location_for_stdc_pragma_p (void);
 840 extern void set_float_const_decimal64 (void);
 841 extern void clear_float_const_decimal64 (void);
 842 extern bool float_const_decimal64_p (void);
 843
 844 extern bool keyword_begins_type_specifier (enum rid);
 845 extern bool keyword_is_storage_class_specifier (enum rid);
 846 extern bool keyword_is_type_qualifier (enum rid);
 847 extern bool keyword_is_decl_specifier (enum rid);
 848 extern unsigned max_align_t_align (void);
 849 extern bool cxx_fundamental_alignment_p (unsigned);
 850 extern bool pointer_to_zero_sized_aggr_p (tree);
 851 extern bool bool_promoted_to_int_p (tree);
 852 extern tree fold_for_warn (tree);
 853 extern tree c_common_get_narrower (tree, int *);
 854 extern bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *);
 855
 856 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, false, 1)
 857 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, false, 1)
 858
 859 /* Subroutine of build_binary_op, used for certain operations.  */
 860 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 861
 862 /* Subroutine of build_binary_op, used for comparison operations.
 863    See if the operands have both been converted from subword integer types
 864    and, if so, perhaps change them both back to their original type.  */
 865 extern tree shorten_compare (location_t, tree *, tree *, tree *,
 866                              enum tree_code *);
 867
 868 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree,
 869                              bool = true);
 870
 871 /* Add qualifiers to a type, in the fashion for C.  */
 872 extern tree c_build_qualified_type (tree, int, tree = NULL_TREE, size_t = 0);
 873
 874 /* Build tree nodes and builtin functions common to both C and C++ language
 875    frontends.  */
 876 extern void c_common_nodes_and_builtins (void);
 877
 878 extern void disable_builtin_function (const char *);
 879
 880 extern void set_compound_literal_name (tree decl);
 881
 882 extern tree build_va_arg (location_t, tree, tree);
 883
 884 extern const unsigned int c_family_lang_mask;
 885 extern unsigned int c_common_option_lang_mask (void);
 886 extern void c_common_diagnostics_set_defaults (diagnostic_context *);
 887 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 888 extern void c_common_init_options_struct (struct gcc_options *);
 889 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 890 extern bool c_common_post_options (const char **);
 891 extern bool c_common_init (void);
 892 extern void c_common_finish (void);
 893 extern void c_common_parse_file (void);
 894 extern FILE *get_dump_info (int, dump_flags_t *);
 895 extern alias_set_type c_common_get_alias_set (tree);
 896 extern void c_register_builtin_type (tree, const char*);
 897 extern bool c_promoting_integer_type_p (const_tree);
 898 extern bool self_promoting_args_p (const_tree);
 899 extern tree strip_pointer_operator (tree);
 900 extern tree strip_pointer_or_array_types (tree);
 901 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 902
 903 /* This is the basic parsing function.  */
 904 extern void c_parse_file (void);
 905
 906 extern void c_parse_final_cleanups (void);
 907
 908 /* These macros provide convenient access to the various _STMT nodes.  */
 909
 910 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 911    if a statement expression.  */
 912 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 913   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 914
 915 /* Nonzero if a label has been added to the statement list.  */
 916 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 917   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 918
 919 /* C_MAYBE_CONST_EXPR accessors.  */
 920 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
 921   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
 922 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
 923   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
 924 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
 925   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 926 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
 927   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 928 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
 929   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
 930    && (TREE_CODE (EXPR) == INTEGER_CST                  \
 931        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
 932            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
 933
 934 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 935 #define DECL_C_BIT_FIELD(NODE) \
 936   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 937 #define SET_DECL_C_BIT_FIELD(NODE) \
 938   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 939 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 940   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 941
 942 extern tree do_case (location_t, tree, tree);
 943 extern tree build_stmt (location_t, enum tree_code, ...);
 944 extern tree build_real_imag_expr (location_t, enum tree_code, tree);
 945
 946 /* These functions must be defined by each front-end which implements
 947    a variant of the C language.  They are used in c-common.c.  */
 948
 949 extern tree build_unary_op (location_t, enum tree_code, tree, bool);
 950 extern tree build_binary_op (location_t, enum tree_code, tree, tree, bool);
 951 extern tree perform_integral_promotions (tree);
 952
 953 /* These functions must be defined by each front-end which implements
 954    a variant of the C language.  They are used by port files.  */
 955
 956 extern tree default_conversion (tree);
 957
 958 /* Given two integer or real types, return the type for their sum.
 959    Given two compatible ANSI C types, returns the merged type.  */
 960
 961 extern tree common_type (tree, tree);
 962
 963 extern tree decl_constant_value (tree);
 964
 965 /* Handle increment and decrement of boolean types.  */
 966 extern tree boolean_increment (enum tree_code, tree);
 967
 968 extern int case_compare (splay_tree_key, splay_tree_key);
 969
 970 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree, tree,
 971                               bool *);
 972 extern bool c_switch_covers_all_cases_p (splay_tree, tree);
 973
 974 extern tree build_function_call (location_t, tree, tree);
 975
 976 extern tree build_function_call_vec (location_t, vec<location_t>, tree,
 977                                      vec<tree, va_gc> *, vec<tree, va_gc> *);
 978
 979 extern tree resolve_overloaded_builtin (location_t, tree, vec<tree, va_gc> *);
 980
 981 extern tree finish_label_address_expr (tree, location_t);
 982
 983 /* Same function prototype, but the C and C++ front ends have
 984    different implementations.  Used in c-common.c.  */
 985 extern tree lookup_label (tree);
 986 extern tree lookup_name (tree);
 987 extern bool lvalue_p (const_tree);
 988
 989 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
 990 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 991 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree, bool = true);
 992
 993 extern void init_c_lex (void);
 994
 995 extern void c_cpp_builtins (cpp_reader *);
 996 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
 997 extern bool c_cpp_error (cpp_reader *, int, int, rich_location *,
 998                          const char *, va_list *)
 999      ATTRIBUTE_GCC_DIAG(5,0);
1000 extern int c_common_has_attribute (cpp_reader *);
1001
1002 extern bool parse_optimize_options (tree, bool);
1003
1004 /* Positive if an implicit `extern "C"' scope has just been entered;
1005    negative if such a scope has just been exited.  */
1006 extern GTY(()) int pending_lang_change;
1007
1008 /* Information recorded about each file examined during compilation.  */
1009
1010 struct c_fileinfo
1011 {
1012   int time;     /* Time spent in the file.  */
1013
1014   /* Flags used only by C++.
1015      INTERFACE_ONLY nonzero means that we are in an "interface" section
1016      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
1017      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
1018      INTERFACE_ONLY is zero, it means that we are responsible for
1019      exporting definitions that others might need.  */
1020   short interface_only;
1021   short interface_unknown;
1022 };
1023
1024 struct c_fileinfo *get_fileinfo (const char *);
1025 extern void dump_time_statistics (void);
1026
1027 extern bool c_dump_tree (void *, tree);
1028
1029 extern void verify_sequence_points (tree);
1030
1031 extern tree fold_offsetof_1 (tree, tree_code ctx = ERROR_MARK);
1032 extern tree fold_offsetof (tree);
1033
1034 extern int complete_array_type (tree *, tree, bool);
1035
1036 extern tree builtin_type_for_size (int, bool);
1037
1038 extern void c_common_mark_addressable_vec (tree);
1039
1040 extern void set_underlying_type (tree);
1041 extern void record_types_used_by_current_var_decl (tree);
1042 extern vec<tree, va_gc> *make_tree_vector (void);
1043 extern void release_tree_vector (vec<tree, va_gc> *);
1044 extern vec<tree, va_gc> *make_tree_vector_single (tree);
1045 extern vec<tree, va_gc> *make_tree_vector_from_list (tree);
1046 extern vec<tree, va_gc> *make_tree_vector_from_ctor (tree);
1047 extern vec<tree, va_gc> *make_tree_vector_copy (const vec<tree, va_gc> *);
1048
1049 /* Used for communication between c_common_type_for_mode and
1050    c_register_builtin_type.  */
1051 extern GTY(()) tree registered_builtin_types;
1052
1053 /* Read SOURCE_DATE_EPOCH from environment to have a deterministic
1054    timestamp to replace embedded current dates to get reproducible
1055    results.  Returns -1 if SOURCE_DATE_EPOCH is not defined.  */
1056 extern time_t cb_get_source_date_epoch (cpp_reader *pfile);
1057
1058 /* The value (as a unix timestamp) corresponds to date
1059    "Dec 31 9999 23:59:59 UTC", which is the latest date that __DATE__ and
1060    __TIME__ can store.  */
1061 #define MAX_SOURCE_DATE_EPOCH HOST_WIDE_INT_C (253402300799)
1062
1063 /* Callback for libcpp for offering spelling suggestions for misspelled
1064    directives.  */
1065 extern const char *cb_get_suggestion (cpp_reader *, const char *,
1066                                       const char *const *);
1067
1068 extern GTY(()) string_concat_db *g_string_concat_db;
1069
1070 class substring_loc;
1071 extern const char *c_get_substring_location (const substring_loc &substr_loc,
1072                                              location_t *out_loc);
1073
1074 /* In c-gimplify.c  */
1075 extern void c_genericize (tree);
1076 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1077 extern tree c_build_bind_expr (location_t, tree, tree);
1078
1079 /* In c-lex.c.  */
1080 extern enum cpp_ttype
1081 conflict_marker_get_final_tok_kind (enum cpp_ttype tok1_kind);
1082
1083 /* In c-pch.c  */
1084 extern void pch_init (void);
1085 extern void pch_cpp_save_state (void);
1086 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1087 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1088                                const char *orig);
1089 extern void c_common_write_pch (void);
1090 extern void c_common_no_more_pch (void);
1091 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1092
1093 /* In *-checksum.c */
1094 extern const unsigned char executable_checksum[16];
1095
1096 /* In c-cppbuiltin.c  */
1097 extern void builtin_define_std (const char *macro);
1098 extern void builtin_define_with_value (const char *, const char *, int);
1099 extern void builtin_define_with_int_value (const char *, HOST_WIDE_INT);
1100 extern void builtin_define_type_sizeof (const char *, tree);
1101 extern void c_stddef_cpp_builtins (void);
1102 extern void fe_file_change (const line_map_ordinary *);
1103 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char,
1104                            rich_location *richloc);
1105
1106 /* In c-ppoutput.c  */
1107 extern void init_pp_output (FILE *);
1108 extern void preprocess_file (cpp_reader *);
1109 extern void pp_file_change (const line_map_ordinary *);
1110 extern void pp_dir_change (cpp_reader *, const char *);
1111 extern bool check_missing_format_attribute (tree, tree);
1112
1113 /* In c-omp.c  */
1114 struct omp_clause_mask
1115 {
1116   inline omp_clause_mask ();
1117   inline omp_clause_mask (uint64_t l);
1118   inline omp_clause_mask (uint64_t l, uint64_t h);
1119   inline omp_clause_mask &operator &= (omp_clause_mask);
1120   inline omp_clause_mask &operator |= (omp_clause_mask);
1121   inline omp_clause_mask operator ~ () const;
1122   inline omp_clause_mask operator & (omp_clause_mask) const;
1123   inline omp_clause_mask operator | (omp_clause_mask) const;
1124   inline omp_clause_mask operator >> (int);
1125   inline omp_clause_mask operator << (int);
1126   inline bool operator == (omp_clause_mask) const;
1127   inline bool operator != (omp_clause_mask) const;
1128   uint64_t low, high;
1129 };
1130
1131 inline
1132 omp_clause_mask::omp_clause_mask ()
1133 {
1134 }
1135
1136 inline
1137 omp_clause_mask::omp_clause_mask (uint64_t l)
1138 : low (l), high (0)
1139 {
1140 }
1141
1142 inline
1143 omp_clause_mask::omp_clause_mask (uint64_t l, uint64_t h)
1144 : low (l), high (h)
1145 {
1146 }
1147
1148 inline omp_clause_mask &
1149 omp_clause_mask::operator &= (omp_clause_mask b)
1150 {
1151   low &= b.low;
1152   high &= b.high;
1153   return *this;
1154 }
1155
1156 inline omp_clause_mask &
1157 omp_clause_mask::operator |= (omp_clause_mask b)
1158 {
1159   low |= b.low;
1160   high |= b.high;
1161   return *this;
1162 }
1163
1164 inline omp_clause_mask
1165 omp_clause_mask::operator ~ () const
1166 {
1167   omp_clause_mask ret (~low, ~high);
1168   return ret;
1169 }
1170
1171 inline omp_clause_mask
1172 omp_clause_mask::operator | (omp_clause_mask b) const
1173 {
1174   omp_clause_mask ret (low | b.low, high | b.high);
1175   return ret;
1176 }
1177
1178 inline omp_clause_mask
1179 omp_clause_mask::operator & (omp_clause_mask b) const
1180 {
1181   omp_clause_mask ret (low & b.low, high & b.high);
1182   return ret;
1183 }
1184
1185 inline omp_clause_mask
1186 omp_clause_mask::operator << (int amount)
1187 {
1188   omp_clause_mask ret;
1189   if (amount >= 64)
1190     {
1191       ret.low = 0;
1192       ret.high = low << (amount - 64);
1193     }
1194   else if (amount == 0)
1195     ret = *this;
1196   else
1197     {
1198       ret.low = low << amount;
1199       ret.high = (low >> (64 - amount)) | (high << amount);
1200     }
1201   return ret;
1202 }
1203
1204 inline omp_clause_mask
1205 omp_clause_mask::operator >> (int amount)
1206 {
1207   omp_clause_mask ret;
1208   if (amount >= 64)
1209     {
1210       ret.low = high >> (amount - 64);
1211       ret.high = 0;
1212     }
1213   else if (amount == 0)
1214     ret = *this;
1215   else
1216     {
1217       ret.low = (high << (64 - amount)) | (low >> amount);
1218       ret.high = high >> amount;
1219     }
1220   return ret;
1221 }
1222
1223 inline bool
1224 omp_clause_mask::operator == (omp_clause_mask b) const
1225 {
1226   return low == b.low && high == b.high;
1227 }
1228
1229 inline bool
1230 omp_clause_mask::operator != (omp_clause_mask b) const
1231 {
1232   return low != b.low || high != b.high;
1233 }
1234
1235 #define OMP_CLAUSE_MASK_1 omp_clause_mask (1)
1236
1237 enum c_omp_clause_split
1238 {
1239   C_OMP_CLAUSE_SPLIT_TARGET = 0,
1240   C_OMP_CLAUSE_SPLIT_TEAMS,
1241   C_OMP_CLAUSE_SPLIT_DISTRIBUTE,
1242   C_OMP_CLAUSE_SPLIT_PARALLEL,
1243   C_OMP_CLAUSE_SPLIT_FOR,
1244   C_OMP_CLAUSE_SPLIT_SIMD,
1245   C_OMP_CLAUSE_SPLIT_COUNT,
1246   C_OMP_CLAUSE_SPLIT_SECTIONS = C_OMP_CLAUSE_SPLIT_FOR,
1247   C_OMP_CLAUSE_SPLIT_TASKLOOP = C_OMP_CLAUSE_SPLIT_FOR
1248 };
1249
1250 enum c_omp_region_type
1251 {
1252   C_ORT_OMP                     = 1 << 0,
1253   C_ORT_ACC                     = 1 << 1,
1254   C_ORT_DECLARE_SIMD            = 1 << 2,
1255   C_ORT_OMP_DECLARE_SIMD        = C_ORT_OMP | C_ORT_DECLARE_SIMD
1256 };
1257
1258 extern tree c_finish_omp_master (location_t, tree);
1259 extern tree c_finish_omp_taskgroup (location_t, tree);
1260 extern tree c_finish_omp_critical (location_t, tree, tree, tree);
1261 extern tree c_finish_omp_ordered (location_t, tree, tree);
1262 extern void c_finish_omp_barrier (location_t);
1263 extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
1264                                  tree, tree, tree, tree, tree, bool, bool,
1265                                  bool = false);
1266 extern void c_finish_omp_flush (location_t);
1267 extern void c_finish_omp_taskwait (location_t);
1268 extern void c_finish_omp_taskyield (location_t);
1269 extern tree c_finish_omp_for (location_t, enum tree_code, tree, tree, tree,
1270                               tree, tree, tree, tree);
1271 extern bool c_omp_check_loop_iv (tree, tree, walk_tree_lh);
1272 extern bool c_omp_check_loop_iv_exprs (location_t, tree, tree, tree, tree,
1273                                        walk_tree_lh);
1274 extern tree c_finish_oacc_wait (location_t, tree, tree);
1275 extern tree c_oacc_split_loop_clauses (tree, tree *, bool);
1276 extern void c_omp_split_clauses (location_t, enum tree_code, omp_clause_mask,
1277                                  tree, tree *);
1278 extern tree c_omp_declare_simd_clauses_to_numbers (tree, tree);
1279 extern void c_omp_declare_simd_clauses_to_decls (tree, tree);
1280 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1281
1282 /* Return next tree in the chain for chain_next walking of tree nodes.  */
1283 static inline tree
1284 c_tree_chain_next (tree t)
1285 {
1286   /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1287      kind of object, never a long chain of nodes.  Prefer
1288      TYPE_NEXT_VARIANT for types.  */
1289   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1290     return TYPE_NEXT_VARIANT (t);
1291   /* Otherwise, if there is TREE_CHAIN, return it.  */
1292   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1293     return TREE_CHAIN (t);
1294   return NULL;
1295 }
1296
1297 /* Mask used by tm_stmt_attr.  */
1298 #define TM_STMT_ATTR_OUTER      2
1299 #define TM_STMT_ATTR_ATOMIC     4
1300 #define TM_STMT_ATTR_RELAXED    8
1301
1302 /* Mask used by tm_attr_to_mask and tm_mask_to_attr.  Note that these
1303    are ordered specifically such that more restrictive attributes are
1304    at lower bit positions.  This fact is known by the C++ tm attribute
1305    inheritance code such that least bit extraction (mask & -mask) results
1306    in the most restrictive attribute.  */
1307 #define TM_ATTR_SAFE                    1
1308 #define TM_ATTR_CALLABLE                2
1309 #define TM_ATTR_PURE                    4
1310 #define TM_ATTR_IRREVOCABLE             8
1311 #define TM_ATTR_MAY_CANCEL_OUTER        16
1312
1313 /* A suffix-identifier value doublet that represents user-defined literals
1314    for C++-0x.  */
1315 enum overflow_type {
1316   OT_UNDERFLOW = -1,
1317   OT_NONE,
1318   OT_OVERFLOW
1319 };
1320
1321 struct GTY(()) tree_userdef_literal {
1322   struct tree_base base;
1323   tree suffix_id;
1324   tree value;
1325   tree num_string;
1326   enum overflow_type overflow;
1327 };
1328
1329 #define USERDEF_LITERAL_SUFFIX_ID(NODE) \
1330   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->suffix_id)
1331
1332 #define USERDEF_LITERAL_VALUE(NODE) \
1333   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->value)
1334
1335 #define USERDEF_LITERAL_OVERFLOW(NODE) \
1336   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->overflow)
1337
1338 #define USERDEF_LITERAL_NUM_STRING(NODE) \
1339   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->num_string)
1340
1341 #define USERDEF_LITERAL_TYPE(NODE) \
1342   (TREE_TYPE (USERDEF_LITERAL_VALUE (NODE)))
1343
1344 extern tree build_userdef_literal (tree suffix_id, tree value,
1345                                    enum overflow_type overflow,
1346                                    tree num_string);
1347
1348 extern bool convert_vector_to_array_for_subscript (location_t, tree *, tree);
1349
1350 /* Possibe cases of scalar_to_vector conversion.  */
1351 enum stv_conv {
1352   stv_error,        /* Error occurred.  */
1353   stv_nothing,      /* Nothing happened.  */
1354   stv_firstarg,     /* First argument must be expanded.  */
1355   stv_secondarg     /* Second argument must be expanded.  */
1356 };
1357
1358 extern enum stv_conv scalar_to_vector (location_t loc, enum tree_code code,
1359                                        tree op0, tree op1, bool);
1360
1361 extern tree find_inv_trees (tree *, int *, void *);
1362 extern tree replace_inv_trees (tree *, int *, void *);
1363
1364 extern bool reject_gcc_builtin (const_tree, location_t = UNKNOWN_LOCATION);
1365 extern bool valid_array_size_p (location_t, tree, tree);
1366
1367 /* In c-warn.c.  */
1368 extern void constant_expression_warning (tree);
1369 extern void constant_expression_error (tree);
1370 extern void overflow_warning (location_t, tree, tree = NULL_TREE);
1371 extern void warn_logical_operator (location_t, enum tree_code, tree,
1372                                    enum tree_code, tree, enum tree_code, tree);
1373 extern void warn_tautological_cmp (location_t, enum tree_code, tree, tree);
1374 extern void warn_logical_not_parentheses (location_t, enum tree_code, tree,
1375                                           tree);
1376 extern bool warn_if_unused_value (const_tree, location_t);
1377 extern bool strict_aliasing_warning (tree, tree, tree);
1378 extern void sizeof_pointer_memaccess_warning (location_t *, tree,
1379                                               vec<tree, va_gc> *, tree *,
1380                                               bool (*) (tree, tree));
1381 extern void check_main_parameter_types (tree decl);
1382 extern void warnings_for_convert_and_check (location_t, tree, tree, tree);
1383 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree, bool,
1384                                   bool);
1385 extern void warn_for_omitted_condop (location_t, tree);
1386 extern void warn_for_restrict (unsigned, tree *, unsigned);
1387
1388 /* Places where an lvalue, or modifiable lvalue, may be required.
1389    Used to select diagnostic messages in lvalue_error and
1390    readonly_error.  */
1391 enum lvalue_use {
1392   lv_assign,
1393   lv_increment,
1394   lv_decrement,
1395   lv_addressof,
1396   lv_asm
1397 };
1398
1399 extern void lvalue_error (location_t, enum lvalue_use);
1400 extern void invalid_indirection_error (location_t, tree, ref_operator);
1401 extern void readonly_error (location_t, tree, enum lvalue_use);
1402 extern void warn_array_subscript_with_type_char (location_t, tree);
1403 extern void warn_about_parentheses (location_t,
1404                                     enum tree_code,
1405                                     enum tree_code, tree,
1406                                     enum tree_code, tree);
1407 extern void warn_for_unused_label (tree label);
1408 extern void warn_for_div_by_zero (location_t, tree divisor);
1409 extern void warn_for_memset (location_t, tree, tree, int);
1410 extern void warn_for_sign_compare (location_t,
1411                                    tree orig_op0, tree orig_op1,
1412                                    tree op0, tree op1,
1413                                    tree result_type,
1414                                    enum tree_code resultcode);
1415 extern void do_warn_double_promotion (tree, tree, tree, const char *,
1416                                       location_t);
1417 extern void do_warn_unused_parameter (tree);
1418 extern void record_locally_defined_typedef (tree);
1419 extern void maybe_record_typedef_use (tree);
1420 extern void maybe_warn_unused_local_typedefs (void);
1421 extern void maybe_warn_bool_compare (location_t, enum tree_code, tree, tree);
1422 extern bool maybe_warn_shift_overflow (location_t, tree, tree);
1423 extern void warn_duplicated_cond_add_or_warn (location_t, tree, vec<tree> **);
1424 extern bool diagnose_mismatched_attributes (tree, tree);
1425 extern tree do_warn_duplicated_branches_r (tree *, int *, void *);
1426 extern void warn_for_multistatement_macros (location_t, location_t,
1427                                             location_t, enum rid);
1428
1429 /* In c-attribs.c.  */
1430 extern bool attribute_takes_identifier_p (const_tree);
1431 extern tree handle_unused_attribute (tree *, tree, tree, int, bool *);
1432 extern int parse_tm_stmt_attr (tree, int);
1433 extern int tm_attr_to_mask (tree);
1434 extern tree tm_mask_to_attr (int);
1435 extern tree find_tm_attribute (tree);
1436
1437 extern enum flt_eval_method
1438 excess_precision_mode_join (enum flt_eval_method, enum flt_eval_method);
1439
1440 extern int c_flt_eval_method (bool ts18661_p);
1441 extern void add_no_sanitize_value (tree node, unsigned int flags);
1442
1443 extern void maybe_add_include_fixit (rich_location *, const char *);
1444 extern void maybe_suggest_missing_token_insertion (rich_location *richloc,
1445                                                    enum cpp_ttype token_type,
1446                                                    location_t prev_token_loc);
1447
1448 #if CHECKING_P
1449 namespace selftest {
1450   /* Declarations for specific families of tests within c-family,
1451      by source file, in alphabetical order.  */
1452   extern void c_format_c_tests (void);
1453   extern void c_spellcheck_cc_tests (void);
1454
1455   /* The entrypoint for running all of the above tests.  */
1456   extern void c_family_tests (void);
1457 } // namespace selftest
1458 #endif /* #if CHECKING_P */
1459
1460 #endif /* ! GCC_C_COMMON_H */