gcc/c-family/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002,
   3    2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011, 2012
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_C_COMMON_H
  23 #define GCC_C_COMMON_H
  24
  25 #include "splay-tree.h"
  26 #include "cpplib.h"
  27 #include "ggc.h"
  28 #include "tree.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       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  49       C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)
  50    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  51       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  52       C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)
  53    2: unused
  54    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  55    4: unused
  56 */
  57
  58 /* Reserved identifiers.  This is the union of all the keywords for C,
  59    C++, Objective-C, and UPC.  All the type modifiers have to be in one
  60    block at the beginning, because they are used as mask bits.  There
  61    are 31 type modifiers; if we add many more we will have to redesign
  62    the mask mechanism.  */
  63
  64 enum rid
  65 {
  66   /* Modifiers: */
  67   /* C, in empirical order of frequency.  */
  68   RID_STATIC = 0,
  69   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  70   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  71   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  72   RID_NORETURN,
  73
  74   /* UPC type qualifiers */
  75   RID_SHARED, RID_RELAXED, RID_STRICT,
  76
  77   /* C extensions */
  78   RID_COMPLEX, RID_THREAD, RID_SAT,
  79
  80   /* C++ */
  81   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  82
  83   /* ObjC ("PQ" reserved words - they do not appear after a '@' and
  84      are keywords only in specific contexts)  */
  85   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  86
  87   /* ObjC ("PATTR" reserved words - they do not appear after a '@'
  88      and are keywords only as property attributes)  */
  89   RID_GETTER, RID_SETTER,
  90   RID_READONLY, RID_READWRITE,
  91   RID_ASSIGN, RID_RETAIN, RID_COPY,
  92   RID_NONATOMIC,
  93
  94   /* C (reserved and imaginary types not implemented, so any use is a
  95      syntax error) */
  96   RID_IMAGINARY,
  97
  98   /* C */
  99   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
 100   RID_INT128,
 101   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
 102   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
 103   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
 104   RID_SIZEOF,
 105
 106   /* C extensions */
 107   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
 108   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
 109   RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,          RID_BUILTIN_SHUFFLE,
 110   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
 111   RID_FRACT, RID_ACCUM,
 112
 113   /* C11 */
 114   RID_ALIGNAS,
 115
 116   /* This means to warn that this is a C++ keyword, and then treat it
 117      as a normal identifier.  */
 118   RID_CXX_COMPAT_WARN,
 119
 120   /* GNU transactional memory extension */
 121   RID_TRANSACTION_ATOMIC, RID_TRANSACTION_RELAXED, RID_TRANSACTION_CANCEL,
 122
 123   /* Too many ways of getting the name of a function as a string */
 124   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
 125
 126   /* C++ (some of these are keywords in Objective-C as well, but only
 127      if they appear after a '@') */
 128   RID_BOOL,     RID_WCHAR,    RID_CLASS,
 129   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
 130   RID_TEMPLATE, RID_NULL,     RID_CATCH,
 131   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
 132   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
 133   RID_THIS,     RID_THROW,    RID_TRUE,
 134   RID_TRY,      RID_TYPENAME, RID_TYPEID,
 135   RID_USING,    RID_CHAR16,   RID_CHAR32,
 136
 137   /* casts */
 138   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
 139
 140   /* C++ extensions */
 141   RID_BASES,                   RID_DIRECT_BASES,
 142   RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
 143   RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
 144   RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
 145   RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_VIRTUAL_DESTRUCTOR,
 146   RID_IS_ABSTRACT,             RID_IS_BASE_OF,
 147   RID_IS_CLASS,                RID_IS_CONVERTIBLE_TO,
 148   RID_IS_EMPTY,                RID_IS_ENUM,
 149   RID_IS_FINAL,                RID_IS_LITERAL_TYPE,
 150   RID_IS_POD,                  RID_IS_POLYMORPHIC,
 151   RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,
 152   RID_IS_UNION,                RID_UNDERLYING_TYPE,
 153
 154   /* C++11 */
 155   RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
 156
 157   /* Objective-C ("AT" reserved words - they are only keywords when
 158      they follow '@')  */
 159   RID_AT_ENCODE,   RID_AT_END,
 160   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 161   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
 162   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 163   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 164   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 165   RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
 166   RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
 167   RID_AT_INTERFACE,
 168   RID_AT_IMPLEMENTATION,
 169
 170   /* UPC */
 171   RID_UPC_BARRIER, RID_UPC_BLOCKSIZEOF, RID_UPC_ELEMSIZEOF,
 172   RID_UPC_FORALL, RID_UPC_LOCALSIZEOF,
 173   RID_UPC_NOTIFY, RID_UPC_WAIT,
 174
 175   /* Named address support, mapping the keyword to a particular named address
 176      number.  Named address space 0 is reserved for the generic address.  If
 177      there are more than 254 named addresses, the addr_space_t type will need
 178      to be grown from an unsigned char to unsigned short.  */
 179   RID_ADDR_SPACE_0,             /* generic address */
 180   RID_ADDR_SPACE_1,
 181   RID_ADDR_SPACE_2,
 182   RID_ADDR_SPACE_3,
 183   RID_ADDR_SPACE_4,
 184   RID_ADDR_SPACE_5,
 185   RID_ADDR_SPACE_6,
 186   RID_ADDR_SPACE_7,
 187   RID_ADDR_SPACE_8,
 188   RID_ADDR_SPACE_9,
 189   RID_ADDR_SPACE_10,
 190   RID_ADDR_SPACE_11,
 191   RID_ADDR_SPACE_12,
 192   RID_ADDR_SPACE_13,
 193   RID_ADDR_SPACE_14,
 194   RID_ADDR_SPACE_15,
 195
 196   RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
 197   RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
 198
 199   RID_MAX,
 200
 201   RID_FIRST_MODIFIER = RID_STATIC,
 202   RID_LAST_MODIFIER = RID_ONEWAY,
 203
 204   RID_FIRST_CXX0X = RID_CONSTEXPR,
 205   RID_LAST_CXX0X = RID_STATIC_ASSERT,
 206   RID_FIRST_AT = RID_AT_ENCODE,
 207   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 208   RID_FIRST_PQ = RID_IN,
 209   RID_LAST_PQ = RID_ONEWAY,
 210   RID_FIRST_PATTR = RID_GETTER,
 211   RID_LAST_PATTR = RID_NONATOMIC
 212 };
 213
 214 #define OBJC_IS_AT_KEYWORD(rid) \
 215   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 216    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 217
 218 #define OBJC_IS_PQ_KEYWORD(rid) \
 219   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 220    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 221
 222 #define OBJC_IS_PATTR_KEYWORD(rid) \
 223   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
 224    (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)
 225
 226 /* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
 227    'class') which are shared in a subtle way between Objective-C and
 228    C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
 229    finds '@' followed by one of these identifiers (eg, '@class'), it
 230    recognizes the whole as an Objective-C keyword.  If the identifier
 231    is found elsewhere, it follows the rules of the C/C++ language.
 232  */
 233 #define OBJC_IS_CXX_KEYWORD(rid) \
 234   (rid == RID_CLASS                                                     \
 235    || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
 236    || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
 237
 238 /* The elements of `ridpointers' are identifier nodes for the reserved
 239    type names and storage classes.  It is indexed by a RID_... value.  */
 240 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 241
 242 /* Standard named or nameless data types of the C compiler.  */
 243
 244 enum c_tree_index
 245 {
 246     CTI_CHAR16_TYPE,
 247     CTI_CHAR32_TYPE,
 248     CTI_WCHAR_TYPE,
 249     CTI_UNDERLYING_WCHAR_TYPE,
 250     CTI_WINT_TYPE,
 251     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 252     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 253     CTI_INTMAX_TYPE,
 254     CTI_UINTMAX_TYPE,
 255     CTI_WIDEST_INT_LIT_TYPE,
 256     CTI_WIDEST_UINT_LIT_TYPE,
 257
 258     /* Types for <stdint.h>, that may not be defined on all
 259        targets.  */
 260     CTI_SIG_ATOMIC_TYPE,
 261     CTI_INT8_TYPE,
 262     CTI_INT16_TYPE,
 263     CTI_INT32_TYPE,
 264     CTI_INT64_TYPE,
 265     CTI_UINT8_TYPE,
 266     CTI_UINT16_TYPE,
 267     CTI_UINT32_TYPE,
 268     CTI_UINT64_TYPE,
 269     CTI_INT_LEAST8_TYPE,
 270     CTI_INT_LEAST16_TYPE,
 271     CTI_INT_LEAST32_TYPE,
 272     CTI_INT_LEAST64_TYPE,
 273     CTI_UINT_LEAST8_TYPE,
 274     CTI_UINT_LEAST16_TYPE,
 275     CTI_UINT_LEAST32_TYPE,
 276     CTI_UINT_LEAST64_TYPE,
 277     CTI_INT_FAST8_TYPE,
 278     CTI_INT_FAST16_TYPE,
 279     CTI_INT_FAST32_TYPE,
 280     CTI_INT_FAST64_TYPE,
 281     CTI_UINT_FAST8_TYPE,
 282     CTI_UINT_FAST16_TYPE,
 283     CTI_UINT_FAST32_TYPE,
 284     CTI_UINT_FAST64_TYPE,
 285     CTI_INTPTR_TYPE,
 286     CTI_UINTPTR_TYPE,
 287
 288     CTI_CHAR_ARRAY_TYPE,
 289     CTI_CHAR16_ARRAY_TYPE,
 290     CTI_CHAR32_ARRAY_TYPE,
 291     CTI_WCHAR_ARRAY_TYPE,
 292     CTI_INT_ARRAY_TYPE,
 293     CTI_STRING_TYPE,
 294     CTI_CONST_STRING_TYPE,
 295
 296     /* Type for boolean expressions (bool in C++, int in C).  */
 297     CTI_TRUTHVALUE_TYPE,
 298     CTI_TRUTHVALUE_TRUE,
 299     CTI_TRUTHVALUE_FALSE,
 300
 301     CTI_DEFAULT_FUNCTION_TYPE,
 302
 303     /* These are not types, but we have to look them up all the time.  */
 304     CTI_FUNCTION_NAME_DECL,
 305     CTI_PRETTY_FUNCTION_NAME_DECL,
 306     CTI_C99_FUNCTION_NAME_DECL,
 307     CTI_SAVED_FUNCTION_NAME_DECLS,
 308
 309     CTI_VOID_ZERO,
 310
 311     CTI_NULL,
 312
 313     CTI_MAX
 314 };
 315
 316 #define C_CPP_HASHNODE(id) \
 317   (&(((struct c_common_identifier *) (id))->node))
 318 #define C_RID_CODE(id) \
 319   ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
 320 #define C_SET_RID_CODE(id, code) \
 321   (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
 322
 323 /* Identifier part common to the C front ends.  Inherits from
 324    tree_identifier, despite appearances.  */
 325 struct GTY(()) c_common_identifier {
 326   struct tree_common common;
 327   struct cpp_hashnode node;
 328 };
 329
 330 /* An entry in the reserved keyword table.  */
 331
 332 struct c_common_resword
 333 {
 334   const char *const word;
 335   ENUM_BITFIELD(rid) const rid : 16;
 336   const unsigned int disable   : 16;
 337 };
 338
 339 /* Extra cpp_ttype values for C++.  */
 340
 341 /* A token type for keywords, as opposed to ordinary identifiers.  */
 342 #define CPP_KEYWORD ((enum cpp_ttype) (N_TTYPES + 1))
 343
 344 /* A token type for template-ids.  If a template-id is processed while
 345    parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
 346    the value of the CPP_TEMPLATE_ID is whatever was returned by
 347    cp_parser_template_id.  */
 348 #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
 349
 350 /* A token type for nested-name-specifiers.  If a
 351    nested-name-specifier is processed while parsing tentatively, it is
 352    replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
 353    CPP_NESTED_NAME_SPECIFIER is whatever was returned by
 354    cp_parser_nested_name_specifier_opt.  */
 355 #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
 356
 357 /* A token type for pre-parsed C++0x decltype.  */
 358 #define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
 359
 360 /* The number of token types, including C++-specific ones.  */
 361 #define N_CP_TTYPES ((int) (CPP_DECLTYPE + 1))
 362
 363 /* Disable mask.  Keywords are disabled if (reswords[i].disable &
 364    mask) is _true_.  Thus for keywords which are present in all
 365    languages the disable field is zero.  */
 366
 367 #define D_CONLY         0x001   /* C only (not in C++).  */
 368 #define D_CXXONLY       0x002   /* C++ only (not in C).  */
 369 #define D_C99           0x004   /* In C, C99 only.  */
 370 #define D_CXX0X         0x008   /* In C++, C++0X only.  */
 371 #define D_EXT           0x010   /* GCC extension.  */
 372 #define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
 373 #define D_ASM           0x040   /* Disabled by -fno-asm.  */
 374 #define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
 375 #define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
 376 #define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
 377 #define D_UPC           0x400   /* In UPC, and neither C nor C++.  */
 378
 379 /* The reserved keyword table.  */
 380 extern const struct c_common_resword c_common_reswords[];
 381
 382 /* The number of items in the reserved keyword table.  */
 383 extern const unsigned int num_c_common_reswords;
 384
 385 #define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
 386 #define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
 387 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 388 #define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
 389 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 390 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 391 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 392 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 393 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 394 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 395 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 396
 397 #define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
 398 #define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
 399 #define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
 400 #define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
 401 #define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
 402 #define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
 403 #define c_uint16_type_node              c_global_trees[CTI_UINT16_TYPE]
 404 #define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
 405 #define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
 406 #define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
 407 #define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
 408 #define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
 409 #define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
 410 #define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
 411 #define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
 412 #define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
 413 #define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
 414 #define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
 415 #define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
 416 #define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
 417 #define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
 418 #define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
 419 #define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
 420 #define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
 421 #define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
 422 #define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
 423 #define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
 424
 425 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 426 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 427 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 428
 429 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 430 #define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
 431 #define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
 432 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 433 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 434 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 435 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 436
 437 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 438
 439 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 440 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 441 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 442 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 443
 444 /* A node for `((void) 0)'.  */
 445 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 446
 447 /* The node for C++ `__null'.  */
 448 #define null_node                       c_global_trees[CTI_NULL]
 449
 450 extern GTY(()) tree c_global_trees[CTI_MAX];
 451
 452 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 453    tree for size reasons.  */
 454 struct GTY((variable_size)) sorted_fields_type {
 455   int len;
 456   tree GTY((length ("%h.len"))) elts[1];
 457 };
 458
 459 /* Mark which labels are explicitly declared.
 460    These may be shadowed, and may be referenced from nested functions.  */
 461 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 462
 463 typedef enum c_language_kind
 464 {
 465   clk_c         = 0,            /* C90, C94 or C99 */
 466   clk_objc      = 1,            /* clk_c with ObjC features.  */
 467   clk_cxx       = 2,            /* ANSI/ISO C++ */
 468   clk_objcxx    = 3,            /* clk_cxx with ObjC features.  */
 469   clk_upc       = 4,            /* clk_c with UPC features */
 470   clk_upcxx     = 6             /* clk_cxx with UPC features */
 471 }
 472 c_language_kind;
 473
 474 /* To test for a specific language use c_language, defined by each
 475    front end.  For "ObjC features" or "not C++" use the macros.  */
 476 extern c_language_kind c_language;
 477
 478 #define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
 479 #define c_dialect_objc()        ((c_language & clk_objc) != 0)
 480 #define c_dialect_upc()         ((c_language & clk_upc) != 0)
 481
 482 /* The various name of operator that appears in error messages. */
 483 typedef enum ref_operator {
 484   /* NULL */
 485   RO_NULL,
 486   /* array indexing */
 487   RO_ARRAY_INDEXING,
 488   /* unary * */
 489   RO_UNARY_STAR,
 490   /* -> */
 491   RO_ARROW,
 492   /* implicit conversion */
 493   RO_IMPLICIT_CONVERSION
 494 } ref_operator;
 495
 496 /* Information about a statement tree.  */
 497
 498 struct GTY(()) stmt_tree_s {
 499   /* A stack of statement lists being collected.  */
 500   VEC(tree,gc) *x_cur_stmt_list;
 501
 502   /* In C++, Nonzero if we should treat statements as full
 503      expressions.  In particular, this variable is non-zero if at the
 504      end of a statement we should destroy any temporaries created
 505      during that statement.  Similarly, if, at the end of a block, we
 506      should destroy any local variables in this block.  Normally, this
 507      variable is nonzero, since those are the normal semantics of
 508      C++.
 509
 510      This flag has no effect in C.  */
 511   int stmts_are_full_exprs_p;
 512 };
 513
 514 typedef struct stmt_tree_s *stmt_tree;
 515
 516 /* Global state pertinent to the current function.  Some C dialects
 517    extend this structure with additional fields.  */
 518
 519 struct GTY(()) c_language_function {
 520   /* While we are parsing the function, this contains information
 521      about the statement-tree that we are building.  */
 522   struct stmt_tree_s x_stmt_tree;
 523
 524   /* Vector of locally defined typedefs, for
 525      -Wunused-local-typedefs.  */
 526   VEC(tree,gc) *local_typedefs;
 527 };
 528
 529 #define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
 530
 531 /* When building a statement-tree, this is the current statement list
 532    being collected.  We define it in this convoluted way, rather than
 533    using VEC_last, because it must be an lvalue.  */
 534
 535 #define cur_stmt_list                                                   \
 536   (*(VEC_address (tree, stmt_list_stack)                                \
 537      + VEC_length (tree, stmt_list_stack) - 1))
 538
 539 #define building_stmt_list_p() (!VEC_empty (tree, stmt_list_stack))
 540
 541 /* Language-specific hooks.  */
 542
 543 /* If non-NULL, this function is called after a precompile header file
 544    is loaded.  */
 545 extern void (*lang_post_pch_load) (void);
 546
 547 extern void push_file_scope (void);
 548 extern void pop_file_scope (void);
 549 extern stmt_tree current_stmt_tree (void);
 550 extern tree push_stmt_list (void);
 551 extern tree pop_stmt_list (tree);
 552 extern tree add_stmt (tree);
 553 extern void push_cleanup (tree, tree, bool);
 554 extern tree pushdecl_top_level (tree);
 555 extern tree pushdecl (tree);
 556 extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
 557                                location_t, tree, tree);
 558 extern tree build_indirect_ref (location_t, tree, ref_operator);
 559
 560 extern int field_decl_cmp (const void *, const void *);
 561 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 562                                   void *);
 563 extern bool has_c_linkage (const_tree decl);
 564 \f
 565 /* Switches common to the C front ends.  */
 566
 567 /* Nonzero means don't output line number information.  */
 568
 569 extern char flag_no_line_commands;
 570
 571 /* Nonzero causes -E output not to be done, but directives such as
 572    #define that have side effects are still obeyed.  */
 573
 574 extern char flag_no_output;
 575
 576 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
 577    'N' or 'U' of the command line switch.  */
 578
 579 extern char flag_dump_macros;
 580
 581 /* Nonzero means pass #include lines through to the output.  */
 582
 583 extern char flag_dump_includes;
 584
 585 /* Nonzero means process PCH files while preprocessing.  */
 586
 587 extern bool flag_pch_preprocess;
 588
 589 /* The file name to which we should write a precompiled header, or
 590    NULL if no header will be written in this compile.  */
 591
 592 extern const char *pch_file;
 593
 594 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 595    user's namespace.  */
 596
 597 extern int flag_iso;
 598
 599 /* Non-zero if the current compilation context is UPC */
 600 extern int compiling_upc;
 601
 602 /* Non-zero if dwarf2 debugging info. should
 603    encode UPC specific information. */
 604 extern int use_upc_dwarf2_extensions;
 605
 606 /* Nonzero whenever UPC functionality is being used.  */
 607 extern int flag_upc;
 608
 609 /* Nonzero whenever UPC -fupc-threads-N is asserted.
 610    The value N gives the number of UPC threads to be
 611    defined at compile-time. */
 612 extern int flag_upc_threads;
 613
 614 /* Non-zero if the current compilation context is UPC */
 615 extern int compiling_upc;
 616
 617 /* Nonzero whenever UPC -fupc-pthreads-model-* is asserted. */
 618 extern int flag_upc_pthreads;
 619
 620 /* The -fupc-pthreads-per-process-N switch tells the UPC compiler
 621    and runtime to map N UPC threads per process onto
 622    N POSIX threads running inside the process. */
 623 extern int flag_upc_pthreads_per_process;
 624
 625 typedef enum
 626   {
 627     upc_pthreads_no_model = 0,
 628     upc_pthreads_tls_model = 1
 629   } upc_pthreads_model_kind;
 630
 631 /* The implementation model for UPC threads that
 632    are mapped to POSIX threads, specified at compilation
 633    time by the -fupc-pthreads-model-* switch. */
 634 extern upc_pthreads_model_kind upc_pthreads_model;
 635
 636 /* Warn about #pragma directives that are not recognized.  */
 637
 638 extern int warn_unknown_pragmas; /* Tri state variable.  */
 639
 640 /* Warn about format/argument anomalies in calls to formatted I/O functions
 641    (*printf, *scanf, strftime, strfmon, etc.).  */
 642
 643 extern int warn_format;
 644
 645
 646 /* C/ObjC language option variables.  */
 647
 648
 649 /* Nonzero means allow type mismatches in conditional expressions;
 650    just make their values `void'.  */
 651
 652 extern int flag_cond_mismatch;
 653
 654 /* Nonzero means enable C89 Amendment 1 features.  */
 655
 656 extern int flag_isoc94;
 657
 658 /* Nonzero means use the ISO C99 (or C11) dialect of C.  */
 659
 660 extern int flag_isoc99;
 661
 662 /* Nonzero means use the ISO C11 dialect of C.  */
 663
 664 extern int flag_isoc11;
 665
 666 /* Nonzero means that we have builtin functions, and main is an int.  */
 667
 668 extern int flag_hosted;
 669
 670 /* ObjC language option variables.  */
 671
 672
 673 /* Tells the compiler that this is a special run.  Do not perform any
 674    compiling, instead we are to test some platform dependent features
 675    and output a C header file with appropriate definitions.  */
 676
 677 extern int print_struct_values;
 678
 679 /* Tells the compiler what is the constant string class for ObjC.  */
 680
 681 extern const char *constant_string_class_name;
 682
 683
 684 /* C++ language option variables.  */
 685
 686
 687 /* Nonzero means generate separate instantiation control files and
 688    juggle them at link time.  */
 689
 690 extern int flag_use_repository;
 691
 692 /* The supported C++ dialects.  */
 693
 694 enum cxx_dialect {
 695   /* C++98 with TC1  */
 696   cxx98,
 697   cxx03 = cxx98,
 698   /* C++11  */
 699   cxx0x,
 700   cxx11 = cxx0x,
 701   /* C++1y (C++17?) */
 702   cxx1y
 703 };
 704
 705 /* The C++ dialect being used. C++98 is the default.  */
 706 extern enum cxx_dialect cxx_dialect;
 707
 708 /* Maximum template instantiation depth.  This limit is rather
 709    arbitrary, but it exists to limit the time it takes to notice
 710    excessively recursive template instantiations.  */
 711
 712 extern int max_tinst_depth;
 713
 714 /* Nonzero means that we should not issue warnings about problems that
 715    occur when the code is executed, because the code being processed
 716    is not expected to be executed.  This is set during parsing.  This
 717    is used for cases like sizeof() and "0 ? a : b".  This is a count,
 718    not a bool, because unexecuted expressions can nest.  */
 719
 720 extern int c_inhibit_evaluation_warnings;
 721
 722 /* Whether lexing has been completed, so subsequent preprocessor
 723    errors should use the compiler's input_location.  */
 724
 725 extern bool done_lexing;
 726
 727 /* C types are partitioned into three subsets: object, function, and
 728    incomplete types.  */
 729 #define C_TYPE_OBJECT_P(type) \
 730   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 731
 732 #define C_TYPE_INCOMPLETE_P(type) \
 733   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 734
 735 #define C_TYPE_FUNCTION_P(type) \
 736   (TREE_CODE (type) == FUNCTION_TYPE)
 737
 738 /* For convenience we define a single macro to identify the class of
 739    object or incomplete types.  */
 740 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 741   (!C_TYPE_FUNCTION_P (type))
 742
 743 struct visibility_flags
 744 {
 745   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 746   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 747 };
 748
 749 /* Global visibility options.  */
 750 extern struct visibility_flags visibility_options;
 751
 752 /* Attribute table common to the C front ends.  */
 753 extern const struct attribute_spec c_common_attribute_table[];
 754 extern const struct attribute_spec c_common_format_attribute_table[];
 755
 756 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 757    ID is the identifier to use, NAME is the string.
 758    TYPE_DEP indicates whether it depends on type of the function or not
 759    (i.e. __PRETTY_FUNCTION__).  */
 760
 761 extern tree (*make_fname_decl) (location_t, tree, int);
 762
 763 /* In c-decl.c and cp/tree.c.  FIXME.  */
 764 extern void c_register_addr_space (const char *str, addr_space_t as);
 765
 766 /* In c-common.c.  */
 767 extern bool in_late_binary_op;
 768 extern const char *c_addr_space_name (addr_space_t as);
 769 extern tree identifier_global_value (tree);
 770 extern tree c_linkage_bindings (tree);
 771 extern void record_builtin_type (enum rid, const char *, tree);
 772 extern tree build_void_list_node (void);
 773 extern void start_fname_decls (void);
 774 extern void finish_fname_decls (void);
 775 extern const char *fname_as_string (int);
 776 extern tree fname_decl (location_t, unsigned, tree);
 777
 778 extern int check_user_alignment (const_tree, bool);
 779 extern void check_function_arguments (const_tree, int, tree *);
 780 extern void check_function_arguments_recurse (void (*)
 781                                               (void *, tree,
 782                                                unsigned HOST_WIDE_INT),
 783                                               void *, tree,
 784                                               unsigned HOST_WIDE_INT);
 785 extern bool check_builtin_function_arguments (tree, int, tree *);
 786 extern void check_function_format (tree, int, tree *);
 787 extern void set_Wformat (int);
 788 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 789 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 790 extern bool attribute_takes_identifier_p (const_tree);
 791 extern bool c_common_handle_option (size_t, const char *, int, int, location_t,
 792                                     const struct cl_option_handlers *);
 793 extern bool default_handle_c_option (size_t, const char *, int);
 794 extern tree c_common_type_for_mode (enum machine_mode, int);
 795 extern tree c_common_type_for_size (unsigned int, int);
 796 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
 797                                                 int, int);
 798 extern tree c_common_unsigned_type (tree);
 799 extern tree c_common_signed_type (tree);
 800 extern tree c_common_signed_or_unsigned_type (int, tree);
 801 extern void c_common_init_ts (void);
 802 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 803 extern bool unsafe_conversion_p (tree, tree, bool);
 804 extern bool decl_with_nonnull_addr_p (const_tree);
 805 extern tree c_fully_fold (tree, bool, bool *);
 806 extern tree decl_constant_value_for_optimization (tree);
 807 extern tree c_wrap_maybe_const (tree, bool);
 808 extern tree c_save_expr (tree);
 809 extern tree c_common_truthvalue_conversion (location_t, tree);
 810 extern void c_apply_type_quals_to_decl (int, tree);
 811 extern tree c_sizeof_or_alignof_type (location_t, tree, bool, int);
 812 extern tree c_alignof_expr (location_t, tree);
 813 /* Print an error message for invalid operands to arith operation CODE.
 814    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 815 extern void binary_op_error (location_t, enum tree_code, tree, tree);
 816 extern tree fix_string_type (tree);
 817 extern void constant_expression_warning (tree);
 818 extern void constant_expression_error (tree);
 819 extern bool strict_aliasing_warning (tree, tree, tree);
 820 extern void sizeof_pointer_memaccess_warning (location_t, tree,
 821                                               VEC(tree, gc) *, tree,
 822                                               bool (*) (tree, tree));
 823 extern void warnings_for_convert_and_check (tree, tree, tree);
 824 extern tree convert_and_check (tree, tree);
 825 extern void overflow_warning (location_t, tree);
 826 extern bool warn_if_unused_value (const_tree, location_t);
 827 extern void warn_logical_operator (location_t, enum tree_code, tree,
 828                                    enum tree_code, tree, enum tree_code, tree);
 829 extern void check_main_parameter_types (tree decl);
 830 extern bool c_determine_visibility (tree);
 831 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 832 extern void mark_valid_location_for_stdc_pragma (bool);
 833 extern bool valid_location_for_stdc_pragma_p (void);
 834 extern void set_float_const_decimal64 (void);
 835 extern void clear_float_const_decimal64 (void);
 836 extern bool float_const_decimal64_p (void);
 837
 838 extern bool keyword_begins_type_specifier (enum rid);
 839 extern bool keyword_is_storage_class_specifier (enum rid);
 840 extern bool keyword_is_type_qualifier (enum rid);
 841 extern bool keyword_is_decl_specifier (enum rid);
 842
 843 #define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, 1)
 844 #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, 1)
 845
 846 /* Subroutine of build_binary_op, used for certain operations.  */
 847 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
 848
 849 /* Subroutine of build_binary_op, used for comparison operations.
 850    See if the operands have both been converted from subword integer types
 851    and, if so, perhaps change them both back to their original type.  */
 852 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 853
 854 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree);
 855
 856 /* Add qualifiers to a type, in the fashion for C.  */
 857 extern tree c_build_qualified_type_1 (tree, int, tree);
 858 #define c_build_qualified_type(TYPE, QUALS) c_build_qualified_type_1 (TYPE, QUALS, 0)
 859
 860 /* Build tree nodes and builtin functions common to both C and C++ language
 861    frontends.  */
 862 extern void c_common_nodes_and_builtins (void);
 863
 864 extern void disable_builtin_function (const char *);
 865
 866 extern void set_compound_literal_name (tree decl);
 867
 868 extern tree build_va_arg (location_t, tree, tree);
 869
 870 extern const unsigned int c_family_lang_mask;
 871 extern unsigned int c_common_option_lang_mask (void);
 872 extern void c_common_initialize_diagnostics (diagnostic_context *);
 873 extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
 874 extern void c_common_init_options_struct (struct gcc_options *);
 875 extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
 876 extern bool c_common_post_options (const char **);
 877 extern bool c_common_init (void);
 878 extern void c_common_finish (void);
 879 extern void c_common_parse_file (void);
 880 extern alias_set_type c_common_get_alias_set (tree);
 881 extern void c_register_builtin_type (tree, const char*);
 882 extern bool c_promoting_integer_type_p (const_tree);
 883 extern int self_promoting_args_p (const_tree);
 884 extern tree strip_pointer_operator (tree);
 885 extern tree strip_pointer_or_array_types (tree);
 886 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 887
 888 /* This is the basic parsing function.  */
 889 extern void c_parse_file (void);
 890
 891 extern void warn_for_omitted_condop (location_t, tree);
 892
 893 /* These macros provide convenient access to the various _STMT nodes.  */
 894
 895 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 896    if a statement expression.  */
 897 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 898   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 899
 900 /* Nonzero if a label has been added to the statement list.  */
 901 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 902   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 903
 904 /* C_MAYBE_CONST_EXPR accessors.  */
 905 #define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
 906   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
 907 #define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
 908   TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
 909 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
 910   TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 911 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
 912   TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
 913 #define EXPR_INT_CONST_OPERANDS(EXPR)                   \
 914   (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
 915    && (TREE_CODE (EXPR) == INTEGER_CST                  \
 916        || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
 917            && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
 918
 919 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 920 #define DECL_C_BIT_FIELD(NODE) \
 921   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 922 #define SET_DECL_C_BIT_FIELD(NODE) \
 923   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 924 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 925   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 926
 927 extern tree do_case (location_t, tree, tree);
 928 extern tree build_stmt (location_t, enum tree_code, ...);
 929 extern tree build_real_imag_expr (location_t, enum tree_code, tree);
 930
 931 /* These functions must be defined by each front-end which implements
 932    a variant of the C language.  They are used in c-common.c.  */
 933
 934 extern tree build_unary_op (location_t, enum tree_code, tree, int);
 935 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
 936 extern tree perform_integral_promotions (tree);
 937
 938 /* These functions must be defined by each front-end which implements
 939    a variant of the C language.  They are used by port files.  */
 940
 941 extern tree default_conversion (tree);
 942
 943 /* Given two integer or real types, return the type for their sum.
 944    Given two compatible ANSI C types, returns the merged type.  */
 945
 946 extern tree common_type (tree, tree);
 947
 948 extern tree decl_constant_value (tree);
 949
 950 /* Handle increment and decrement of boolean types.  */
 951 extern tree boolean_increment (enum tree_code, tree);
 952
 953 extern int case_compare (splay_tree_key, splay_tree_key);
 954
 955 extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree, tree);
 956
 957 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 958
 959 extern tree build_function_call (location_t, tree, tree);
 960
 961 extern tree build_function_call_vec (location_t, tree,
 962                                      VEC(tree,gc) *, VEC(tree,gc) *);
 963
 964 extern tree resolve_overloaded_builtin (location_t, tree, VEC(tree,gc) *);
 965
 966 extern tree finish_label_address_expr (tree, location_t);
 967
 968 /* Same function prototype, but the C and C++ front ends have
 969    different implementations.  Used in c-common.c.  */
 970 extern tree lookup_label (tree);
 971 extern tree lookup_name (tree);
 972 extern bool lvalue_p (const_tree);
 973
 974 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
 975 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
 976 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree);
 977
 978 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 979
 980 extern void init_c_lex (void);
 981
 982 extern void c_cpp_builtins (cpp_reader *);
 983 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
 984 extern bool c_cpp_error (cpp_reader *, int, int, location_t, unsigned int,
 985                          const char *, va_list *)
 986      ATTRIBUTE_GCC_DIAG(6,0);
 987
 988 extern bool parse_optimize_options (tree, bool);
 989
 990 /* Positive if an implicit `extern "C"' scope has just been entered;
 991    negative if such a scope has just been exited.  */
 992 extern GTY(()) int pending_lang_change;
 993
 994 /* Information recorded about each file examined during compilation.  */
 995
 996 struct c_fileinfo
 997 {
 998   int time;     /* Time spent in the file.  */
 999
1000   /* Flags used only by C++.
1001      INTERFACE_ONLY nonzero means that we are in an "interface" section
1002      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
1003      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
1004      INTERFACE_ONLY is zero, it means that we are responsible for
1005      exporting definitions that others might need.  */
1006   short interface_only;
1007   short interface_unknown;
1008 };
1009
1010 struct c_fileinfo *get_fileinfo (const char *);
1011 extern void dump_time_statistics (void);
1012
1013 extern bool c_dump_tree (void *, tree);
1014
1015 extern void verify_sequence_points (tree);
1016
1017 extern tree fold_offsetof_1 (tree);
1018 extern tree fold_offsetof (tree);
1019
1020 /* Places where an lvalue, or modifiable lvalue, may be required.
1021    Used to select diagnostic messages in lvalue_error and
1022    readonly_error.  */
1023 enum lvalue_use {
1024   lv_assign,
1025   lv_increment,
1026   lv_decrement,
1027   lv_addressof,
1028   lv_asm
1029 };
1030
1031 extern void readonly_error (tree, enum lvalue_use);
1032 extern void lvalue_error (location_t, enum lvalue_use);
1033 extern void invalid_indirection_error (location_t, tree, ref_operator);
1034
1035 extern int complete_array_type (tree *, tree, bool);
1036
1037 extern tree builtin_type_for_size (int, bool);
1038
1039 extern void c_common_mark_addressable_vec (tree);
1040
1041 extern void warn_array_subscript_with_type_char (tree);
1042 extern void warn_about_parentheses (enum tree_code,
1043                                     enum tree_code, tree,
1044                                     enum tree_code, tree);
1045 extern void warn_for_unused_label (tree label);
1046 extern void warn_for_div_by_zero (location_t, tree divisor);
1047 extern void warn_for_sign_compare (location_t,
1048                                    tree orig_op0, tree orig_op1,
1049                                    tree op0, tree op1,
1050                                    tree result_type,
1051                                    enum tree_code resultcode);
1052 extern void do_warn_double_promotion (tree, tree, tree, const char *,
1053                                       location_t);
1054 extern void set_underlying_type (tree);
1055 extern void record_locally_defined_typedef (tree);
1056 extern void maybe_record_typedef_use (tree);
1057 extern void maybe_warn_unused_local_typedefs (void);
1058 extern VEC(tree,gc) *make_tree_vector (void);
1059 extern void release_tree_vector (VEC(tree,gc) *);
1060 extern VEC(tree,gc) *make_tree_vector_single (tree);
1061 extern VEC(tree,gc) *make_tree_vector_from_list (tree);
1062 extern VEC(tree,gc) *make_tree_vector_copy (const VEC(tree,gc) *);
1063
1064 /* In c-gimplify.c  */
1065 extern void c_genericize (tree);
1066 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1067 extern tree c_build_bind_expr (location_t, tree, tree);
1068
1069 /* In c-pch.c  */
1070 extern void pch_init (void);
1071 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1072 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1073                                const char *orig);
1074 extern void c_common_write_pch (void);
1075 extern void c_common_no_more_pch (void);
1076 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1077
1078 /* In *-checksum.c */
1079 extern const unsigned char executable_checksum[16];
1080
1081 /* In c-cppbuiltin.c  */
1082 extern void builtin_define_std (const char *macro);
1083 extern void builtin_define_with_value (const char *, const char *, int);
1084 extern void c_stddef_cpp_builtins (void);
1085 extern void fe_file_change (const struct line_map *);
1086 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char);
1087
1088 /* In c-ppoutput.c  */
1089 extern void init_pp_output (FILE *);
1090 extern void preprocess_file (cpp_reader *);
1091 extern void pp_file_change (const struct line_map *);
1092 extern void pp_dir_change (cpp_reader *, const char *);
1093 extern bool check_missing_format_attribute (tree, tree);
1094
1095 /* In c-omp.c  */
1096 extern tree c_finish_omp_master (location_t, tree);
1097 extern tree c_finish_omp_critical (location_t, tree, tree);
1098 extern tree c_finish_omp_ordered (location_t, tree);
1099 extern void c_finish_omp_barrier (location_t);
1100 extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
1101                                  tree, tree, tree, tree, tree);
1102 extern void c_finish_omp_flush (location_t);
1103 extern void c_finish_omp_taskwait (location_t);
1104 extern void c_finish_omp_taskyield (location_t);
1105 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1106 extern void c_split_parallel_clauses (location_t, tree, tree *, tree *);
1107 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1108
1109 /* Not in c-omp.c; provided by the front end.  */
1110 extern bool c_omp_sharing_predetermined (tree);
1111 extern tree c_omp_remap_decl (tree, bool);
1112 extern void record_types_used_by_current_var_decl (tree);
1113
1114 /* Return next tree in the chain for chain_next walking of tree nodes.  */
1115 static inline tree
1116 c_tree_chain_next (tree t)
1117 {
1118   /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1119      kind of object, never a long chain of nodes.  Prefer
1120      TYPE_NEXT_VARIANT for types.  */
1121   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1122     return TYPE_NEXT_VARIANT (t);
1123   /* Otherwise, if there is TREE_CHAIN, return it.  */
1124   if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1125     return TREE_CHAIN (t);
1126   return NULL;
1127 }
1128
1129 /* Mask used by tm_stmt_attr.  */
1130 #define TM_STMT_ATTR_OUTER      2
1131 #define TM_STMT_ATTR_ATOMIC     4
1132 #define TM_STMT_ATTR_RELAXED    8
1133
1134 extern int parse_tm_stmt_attr (tree, int);
1135
1136 /* Mask used by tm_attr_to_mask and tm_mask_to_attr.  Note that these
1137    are ordered specifically such that more restrictive attributes are
1138    at lower bit positions.  This fact is known by the C++ tm attribute
1139    inheritance code such that least bit extraction (mask & -mask) results
1140    in the most restrictive attribute.  */
1141 #define TM_ATTR_SAFE                    1
1142 #define TM_ATTR_CALLABLE                2
1143 #define TM_ATTR_PURE                    4
1144 #define TM_ATTR_IRREVOCABLE             8
1145 #define TM_ATTR_MAY_CANCEL_OUTER        16
1146
1147 extern int tm_attr_to_mask (tree);
1148 extern tree tm_mask_to_attr (int);
1149 extern tree find_tm_attribute (tree);
1150
1151 /* A suffix-identifier value doublet that represents user-defined literals
1152    for C++-0x.  */
1153 struct GTY(()) tree_userdef_literal {
1154   struct tree_base base;
1155   tree suffix_id;
1156   tree value;
1157   tree num_string;
1158 };
1159
1160 #define USERDEF_LITERAL_SUFFIX_ID(NODE) \
1161   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->suffix_id)
1162
1163 #define USERDEF_LITERAL_VALUE(NODE) \
1164   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->value)
1165
1166 #define USERDEF_LITERAL_NUM_STRING(NODE) \
1167   (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->num_string)
1168
1169 #define USERDEF_LITERAL_TYPE(NODE) \
1170   (TREE_TYPE (USERDEF_LITERAL_VALUE (NODE)))
1171
1172 extern tree build_userdef_literal (tree suffix_id, tree value, tree num_string);
1173
1174 extern void convert_vector_to_pointer_for_subscript (location_t, tree*, tree);
1175
1176 #endif /* ! GCC_C_COMMON_H */