gcc/cp/cp-tree.h

   1 /* Definitions for C++ parsing and type checking.
   2    Copyright (C) 1987-2018 Free Software Foundation, Inc.
   3    Contributed by Michael Tiemann (tiemann@cygnus.com)
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_CP_TREE_H
  22 #define GCC_CP_TREE_H
  23
  24 #include "tm.h"
  25 #include "hard-reg-set.h"
  26 #include "function.h"
  27
  28 /* In order for the format checking to accept the C++ front end
  29    diagnostic framework extensions, you must include this file before
  30    diagnostic-core.h, not after.  We override the definition of GCC_DIAG_STYLE
  31    in c-common.h.  */
  32 #undef GCC_DIAG_STYLE
  33 #define GCC_DIAG_STYLE __gcc_cxxdiag__
  34 #if defined(GCC_DIAGNOSTIC_CORE_H) || defined (GCC_C_COMMON_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 and \
  38 c-common.h, not after.
  39 #endif
  40 #include "c-family/c-common.h"
  41 #include "diagnostic.h"
  42
  43 /* A tree node, together with a location, so that we can track locations
  44    (and ranges) during parsing.
  45
  46    The location is redundant for node kinds that have locations,
  47    but not all node kinds do (e.g. constants, and references to
  48    params, locals, etc), so we stash a copy here.  */
  49
  50 extern location_t cp_expr_location              (const_tree);
  51
  52 class cp_expr
  53 {
  54 public:
  55   cp_expr () :
  56     m_value (NULL), m_loc (UNKNOWN_LOCATION) {}
  57
  58   cp_expr (tree value) :
  59     m_value (value), m_loc (cp_expr_location (m_value)) {}
  60
  61   cp_expr (tree value, location_t loc):
  62     m_value (value), m_loc (loc) {}
  63
  64   /* Implicit conversions to tree.  */
  65   operator tree () const { return m_value; }
  66   tree & operator* () { return m_value; }
  67   tree operator* () const { return m_value; }
  68   tree & operator-> () { return m_value; }
  69   tree operator-> () const { return m_value; }
  70
  71   tree get_value () const { return m_value; }
  72   location_t get_location () const { return m_loc; }
  73   location_t get_start () const
  74   {
  75     source_range src_range = get_range_from_loc (line_table, m_loc);
  76     return src_range.m_start;
  77   }
  78   location_t get_finish () const
  79   {
  80     source_range src_range = get_range_from_loc (line_table, m_loc);
  81     return src_range.m_finish;
  82   }
  83
  84   void set_location (location_t loc)
  85   {
  86     protected_set_expr_location (m_value, loc);
  87     m_loc = loc;
  88   }
  89
  90   void set_range (location_t start, location_t finish)
  91   {
  92     set_location (make_location (m_loc, start, finish));
  93   }
  94
  95   cp_expr& maybe_add_location_wrapper ()
  96   {
  97     m_value = maybe_wrap_with_location (m_value, m_loc);
  98     return *this;
  99   }
 100
 101  private:
 102   tree m_value;
 103   location_t m_loc;
 104 };
 105
 106 inline bool
 107 operator == (const cp_expr &lhs, tree rhs)
 108 {
 109   return lhs.get_value () == rhs;
 110 }
 111
 112 \f
 113 enum cp_tree_index
 114 {
 115     CPTI_WCHAR_DECL,
 116     CPTI_VTABLE_ENTRY_TYPE,
 117     CPTI_DELTA_TYPE,
 118     CPTI_VTABLE_INDEX_TYPE,
 119     CPTI_CLEANUP_TYPE,
 120     CPTI_VTT_PARM_TYPE,
 121
 122     CPTI_CLASS_TYPE,
 123     CPTI_UNKNOWN_TYPE,
 124     CPTI_INIT_LIST_TYPE,
 125     CPTI_VTBL_TYPE,
 126     CPTI_VTBL_PTR_TYPE,
 127     CPTI_STD,
 128     CPTI_ABI,
 129     CPTI_GLOBAL,
 130     CPTI_GLOBAL_TYPE,
 131     CPTI_CONST_TYPE_INFO_TYPE,
 132     CPTI_TYPE_INFO_PTR_TYPE,
 133     CPTI_ABORT_FNDECL,
 134     CPTI_AGGR_TAG,
 135     CPTI_CONV_OP_MARKER,
 136
 137     CPTI_CTOR_IDENTIFIER,
 138     CPTI_COMPLETE_CTOR_IDENTIFIER,
 139     CPTI_BASE_CTOR_IDENTIFIER,
 140     CPTI_DTOR_IDENTIFIER,
 141     CPTI_COMPLETE_DTOR_IDENTIFIER,
 142     CPTI_BASE_DTOR_IDENTIFIER,
 143     CPTI_DELETING_DTOR_IDENTIFIER,
 144     CPTI_CONV_OP_IDENTIFIER,
 145     CPTI_DELTA_IDENTIFIER,
 146     CPTI_IN_CHARGE_IDENTIFIER,
 147     CPTI_VTT_PARM_IDENTIFIER,
 148     CPTI_THIS_IDENTIFIER,
 149     CPTI_PFN_IDENTIFIER,
 150     CPTI_VPTR_IDENTIFIER,
 151     CPTI_GLOBAL_IDENTIFIER,
 152     CPTI_STD_IDENTIFIER,
 153     CPTI_ANON_IDENTIFIER,
 154     CPTI_AUTO_IDENTIFIER,
 155     CPTI_DECLTYPE_AUTO_IDENTIFIER,
 156     CPTI_INIT_LIST_IDENTIFIER,
 157     CPTI_FOR_RANGE__IDENTIFIER,
 158     CPTI_FOR_BEGIN__IDENTIFIER,
 159     CPTI_FOR_END__IDENTIFIER,
 160     CPTI_FOR_RANGE_IDENTIFIER,
 161     CPTI_FOR_BEGIN_IDENTIFIER,
 162     CPTI_FOR_END_IDENTIFIER,
 163     CPTI_ABI_TAG_IDENTIFIER,
 164     CPTI_ALIGNED_IDENTIFIER,
 165     CPTI_BEGIN_IDENTIFIER,
 166     CPTI_END_IDENTIFIER,
 167     CPTI_GET_IDENTIFIER,
 168     CPTI_GNU_IDENTIFIER,
 169     CPTI_TUPLE_ELEMENT_IDENTIFIER,
 170     CPTI_TUPLE_SIZE_IDENTIFIER,
 171     CPTI_TYPE_IDENTIFIER,
 172     CPTI_VALUE_IDENTIFIER,
 173     CPTI_FUN_IDENTIFIER,
 174     CPTI_CLOSURE_IDENTIFIER,
 175
 176     CPTI_LANG_NAME_C,
 177     CPTI_LANG_NAME_CPLUSPLUS,
 178
 179     CPTI_EMPTY_EXCEPT_SPEC,
 180     CPTI_NOEXCEPT_TRUE_SPEC,
 181     CPTI_NOEXCEPT_FALSE_SPEC,
 182     CPTI_NOEXCEPT_DEFERRED_SPEC,
 183
 184     CPTI_TERMINATE_FN,
 185     CPTI_CALL_UNEXPECTED_FN,
 186     CPTI_GET_EXCEPTION_PTR_FN,
 187     CPTI_BEGIN_CATCH_FN,
 188     CPTI_END_CATCH_FN,
 189     CPTI_ALLOCATE_EXCEPTION_FN,
 190     CPTI_FREE_EXCEPTION_FN,
 191     CPTI_THROW_FN,
 192     CPTI_RETHROW_FN,
 193     CPTI_ATEXIT_FN_PTR_TYPE,
 194     CPTI_ATEXIT,
 195     CPTI_DSO_HANDLE,
 196     CPTI_DCAST,
 197
 198     CPTI_NULLPTR,
 199     CPTI_NULLPTR_TYPE,
 200
 201     CPTI_ALIGN_TYPE,
 202
 203     CPTI_ANY_TARG,
 204
 205     CPTI_MAX
 206 };
 207
 208 extern GTY(()) tree cp_global_trees[CPTI_MAX];
 209
 210 #define wchar_decl_node                 cp_global_trees[CPTI_WCHAR_DECL]
 211 #define vtable_entry_type               cp_global_trees[CPTI_VTABLE_ENTRY_TYPE]
 212 /* The type used to represent an offset by which to adjust the `this'
 213    pointer in pointer-to-member types.  */
 214 #define delta_type_node                 cp_global_trees[CPTI_DELTA_TYPE]
 215 /* The type used to represent an index into the vtable.  */
 216 #define vtable_index_type               cp_global_trees[CPTI_VTABLE_INDEX_TYPE]
 217
 218 #define class_type_node                 cp_global_trees[CPTI_CLASS_TYPE]
 219 #define unknown_type_node               cp_global_trees[CPTI_UNKNOWN_TYPE]
 220 #define init_list_type_node             cp_global_trees[CPTI_INIT_LIST_TYPE]
 221 #define vtbl_type_node                  cp_global_trees[CPTI_VTBL_TYPE]
 222 #define vtbl_ptr_type_node              cp_global_trees[CPTI_VTBL_PTR_TYPE]
 223 #define std_node                        cp_global_trees[CPTI_STD]
 224 #define abi_node                        cp_global_trees[CPTI_ABI]
 225 #define global_namespace                cp_global_trees[CPTI_GLOBAL]
 226 #define global_type_node                cp_global_trees[CPTI_GLOBAL_TYPE]
 227 #define const_type_info_type_node       cp_global_trees[CPTI_CONST_TYPE_INFO_TYPE]
 228 #define type_info_ptr_type              cp_global_trees[CPTI_TYPE_INFO_PTR_TYPE]
 229 #define conv_op_marker                  cp_global_trees[CPTI_CONV_OP_MARKER]
 230 #define abort_fndecl                    cp_global_trees[CPTI_ABORT_FNDECL]
 231 #define current_aggr                    cp_global_trees[CPTI_AGGR_TAG]
 232 #define nullptr_node                    cp_global_trees[CPTI_NULLPTR]
 233 #define nullptr_type_node               cp_global_trees[CPTI_NULLPTR_TYPE]
 234 /* std::align_val_t */
 235 #define align_type_node                 cp_global_trees[CPTI_ALIGN_TYPE]
 236
 237 /* We cache these tree nodes so as to call get_identifier less frequently.
 238    For identifiers for functions, including special member functions such
 239    as ctors and assignment operators, the nodes can be used (among other
 240    things) to iterate over their overloads defined by/for a type.  For
 241    example:
 242
 243      tree ovlid = assign_op_identifier;
 244      tree overloads = get_class_binding (type, ovlid);
 245      for (ovl_iterator it (overloads); it; ++it) { ... }
 246
 247    iterates over the set of implicitly and explicitly defined overloads
 248    of the assignment operator for type (including the copy and move
 249    assignment operators, whether deleted or not).  */
 250
 251 /* The name of a constructor that takes an in-charge parameter to
 252    decide whether or not to construct virtual base classes.  */
 253 #define ctor_identifier                 cp_global_trees[CPTI_CTOR_IDENTIFIER]
 254 /* The name of a constructor that constructs virtual base classes.  */
 255 #define complete_ctor_identifier        cp_global_trees[CPTI_COMPLETE_CTOR_IDENTIFIER]
 256 /* The name of a constructor that does not construct virtual base classes.  */
 257 #define base_ctor_identifier            cp_global_trees[CPTI_BASE_CTOR_IDENTIFIER]
 258 /* The name of a destructor that takes an in-charge parameter to
 259    decide whether or not to destroy virtual base classes and whether
 260    or not to delete the object.  */
 261 #define dtor_identifier                 cp_global_trees[CPTI_DTOR_IDENTIFIER]
 262 /* The name of a destructor that destroys virtual base classes.  */
 263 #define complete_dtor_identifier        cp_global_trees[CPTI_COMPLETE_DTOR_IDENTIFIER]
 264 /* The name of a destructor that does not destroy virtual base
 265    classes.  */
 266 #define base_dtor_identifier            cp_global_trees[CPTI_BASE_DTOR_IDENTIFIER]
 267 /* The name of a destructor that destroys virtual base classes, and
 268    then deletes the entire object.  */
 269 #define deleting_dtor_identifier        cp_global_trees[CPTI_DELETING_DTOR_IDENTIFIER]
 270
 271 #define ovl_op_identifier(ISASS, CODE)  (OVL_OP_INFO(ISASS, CODE)->identifier)
 272 #define assign_op_identifier (ovl_op_info[true][OVL_OP_NOP_EXPR].identifier)
 273 #define call_op_identifier (ovl_op_info[false][OVL_OP_CALL_EXPR].identifier)
 274 /* The name used for conversion operators -- but note that actual
 275    conversion functions use special identifiers outside the identifier
 276    table.  */
 277 #define conv_op_identifier              cp_global_trees[CPTI_CONV_OP_IDENTIFIER]
 278
 279 #define delta_identifier                cp_global_trees[CPTI_DELTA_IDENTIFIER]
 280 #define in_charge_identifier            cp_global_trees[CPTI_IN_CHARGE_IDENTIFIER]
 281 /* The name of the parameter that contains a pointer to the VTT to use
 282    for this subobject constructor or destructor.  */
 283 #define vtt_parm_identifier             cp_global_trees[CPTI_VTT_PARM_IDENTIFIER]
 284 #define this_identifier                 cp_global_trees[CPTI_THIS_IDENTIFIER]
 285 #define pfn_identifier                  cp_global_trees[CPTI_PFN_IDENTIFIER]
 286 #define vptr_identifier                 cp_global_trees[CPTI_VPTR_IDENTIFIER]
 287 /* The name of the ::, std & anon namespaces.  */
 288 #define global_identifier               cp_global_trees[CPTI_GLOBAL_IDENTIFIER]
 289 #define std_identifier                  cp_global_trees[CPTI_STD_IDENTIFIER]
 290 #define anon_identifier                 cp_global_trees[CPTI_ANON_IDENTIFIER]
 291 /* auto and declspec(auto) identifiers.  */
 292 #define auto_identifier                 cp_global_trees[CPTI_AUTO_IDENTIFIER]
 293 #define decltype_auto_identifier        cp_global_trees[CPTI_DECLTYPE_AUTO_IDENTIFIER]
 294 #define init_list_identifier            cp_global_trees[CPTI_INIT_LIST_IDENTIFIER]
 295 #define for_range__identifier           cp_global_trees[CPTI_FOR_RANGE__IDENTIFIER]
 296 #define for_begin__identifier           cp_global_trees[CPTI_FOR_BEGIN__IDENTIFIER]
 297 #define for_end__identifier             cp_global_trees[CPTI_FOR_END__IDENTIFIER]
 298 #define for_range_identifier            cp_global_trees[CPTI_FOR_RANGE_IDENTIFIER]
 299 #define for_begin_identifier            cp_global_trees[CPTI_FOR_BEGIN_IDENTIFIER]
 300 #define for_end_identifier              cp_global_trees[CPTI_FOR_END_IDENTIFIER]
 301 #define abi_tag_identifier              cp_global_trees[CPTI_ABI_TAG_IDENTIFIER]
 302 #define aligned_identifier              cp_global_trees[CPTI_ALIGNED_IDENTIFIER]
 303 #define begin_identifier                cp_global_trees[CPTI_BEGIN_IDENTIFIER]
 304 #define end_identifier                  cp_global_trees[CPTI_END_IDENTIFIER]
 305 #define get__identifier                 cp_global_trees[CPTI_GET_IDENTIFIER]
 306 #define gnu_identifier                  cp_global_trees[CPTI_GNU_IDENTIFIER]
 307 #define tuple_element_identifier        cp_global_trees[CPTI_TUPLE_ELEMENT_IDENTIFIER]
 308 #define tuple_size_identifier           cp_global_trees[CPTI_TUPLE_SIZE_IDENTIFIER]
 309 #define type_identifier                 cp_global_trees[CPTI_TYPE_IDENTIFIER]
 310 #define value_identifier                cp_global_trees[CPTI_VALUE_IDENTIFIER]
 311 #define fun_identifier                  cp_global_trees[CPTI_FUN_IDENTIFIER]
 312 #define closure_identifier              cp_global_trees[CPTI_CLOSURE_IDENTIFIER]
 313 #define lang_name_c                     cp_global_trees[CPTI_LANG_NAME_C]
 314 #define lang_name_cplusplus             cp_global_trees[CPTI_LANG_NAME_CPLUSPLUS]
 315
 316 /* Exception specifiers used for throw(), noexcept(true),
 317    noexcept(false) and deferred noexcept.  We rely on these being
 318    uncloned.  */
 319 #define empty_except_spec               cp_global_trees[CPTI_EMPTY_EXCEPT_SPEC]
 320 #define noexcept_true_spec              cp_global_trees[CPTI_NOEXCEPT_TRUE_SPEC]
 321 #define noexcept_false_spec             cp_global_trees[CPTI_NOEXCEPT_FALSE_SPEC]
 322 #define noexcept_deferred_spec          cp_global_trees[CPTI_NOEXCEPT_DEFERRED_SPEC]
 323
 324 /* Exception handling function declarations.  */
 325 #define terminate_fn                    cp_global_trees[CPTI_TERMINATE_FN]
 326 #define call_unexpected_fn              cp_global_trees[CPTI_CALL_UNEXPECTED_FN]
 327 #define get_exception_ptr_fn            cp_global_trees[CPTI_GET_EXCEPTION_PTR_FN]
 328 #define begin_catch_fn                  cp_global_trees[CPTI_BEGIN_CATCH_FN]
 329 #define end_catch_fn                    cp_global_trees[CPTI_END_CATCH_FN]
 330 #define allocate_exception_fn           cp_global_trees[CPTI_ALLOCATE_EXCEPTION_FN]
 331 #define free_exception_fn               cp_global_trees[CPTI_FREE_EXCEPTION_FN]
 332 #define throw_fn                        cp_global_trees[CPTI_THROW_FN]
 333 #define rethrow_fn                      cp_global_trees[CPTI_RETHROW_FN]
 334
 335 /* The type of the function-pointer argument to "__cxa_atexit" (or
 336    "std::atexit", if "__cxa_atexit" is not being used).  */
 337 #define atexit_fn_ptr_type_node         cp_global_trees[CPTI_ATEXIT_FN_PTR_TYPE]
 338
 339 /* A pointer to `std::atexit'.  */
 340 #define atexit_node                     cp_global_trees[CPTI_ATEXIT]
 341
 342 /* A pointer to `__dso_handle'.  */
 343 #define dso_handle_node                 cp_global_trees[CPTI_DSO_HANDLE]
 344
 345 /* The declaration of the dynamic_cast runtime.  */
 346 #define dynamic_cast_node               cp_global_trees[CPTI_DCAST]
 347
 348 /* The type of a destructor.  */
 349 #define cleanup_type                    cp_global_trees[CPTI_CLEANUP_TYPE]
 350
 351 /* The type of the vtt parameter passed to subobject constructors and
 352    destructors.  */
 353 #define vtt_parm_type                   cp_global_trees[CPTI_VTT_PARM_TYPE]
 354
 355 /* A node which matches any template argument.  */
 356 #define any_targ_node                   cp_global_trees[CPTI_ANY_TARG]
 357
 358 /* Node to indicate default access. This must be distinct from the
 359    access nodes in tree.h.  */
 360
 361 #define access_default_node             null_node
 362
 363 \f
 364 #include "name-lookup.h"
 365
 366 /* Usage of TREE_LANG_FLAG_?:
 367    0: IDENTIFIER_KIND_BIT_0 (in IDENTIFIER_NODE)
 368       NEW_EXPR_USE_GLOBAL (in NEW_EXPR).
 369       COND_EXPR_IS_VEC_DELETE (in COND_EXPR).
 370       DELETE_EXPR_USE_GLOBAL (in DELETE_EXPR).
 371       COMPOUND_EXPR_OVERLOADED (in COMPOUND_EXPR).
 372       CLEANUP_P (in TRY_BLOCK)
 373       AGGR_INIT_VIA_CTOR_P (in AGGR_INIT_EXPR)
 374       PTRMEM_OK_P (in ADDR_EXPR, OFFSET_REF, SCOPE_REF)
 375       PAREN_STRING_LITERAL (in STRING_CST)
 376       CP_DECL_THREAD_LOCAL_P (in VAR_DECL)
 377       KOENIG_LOOKUP_P (in CALL_EXPR)
 378       STATEMENT_LIST_NO_SCOPE (in STATEMENT_LIST).
 379       EXPR_STMT_STMT_EXPR_RESULT (in EXPR_STMT)
 380       STMT_EXPR_NO_SCOPE (in STMT_EXPR)
 381       BIND_EXPR_TRY_BLOCK (in BIND_EXPR)
 382       TYPENAME_IS_ENUM_P (in TYPENAME_TYPE)
 383       OMP_FOR_GIMPLIFYING_P (in OMP_FOR, OMP_SIMD, OMP_DISTRIBUTE,
 384                              and OMP_TASKLOOP)
 385       BASELINK_QUALIFIED_P (in BASELINK)
 386       TARGET_EXPR_IMPLICIT_P (in TARGET_EXPR)
 387       TEMPLATE_PARM_PARAMETER_PACK (in TEMPLATE_PARM_INDEX)
 388       ATTR_IS_DEPENDENT (in the TREE_LIST for an attribute)
 389       ABI_TAG_IMPLICIT (in the TREE_LIST for the argument of abi_tag)
 390       LAMBDA_CAPTURE_EXPLICIT_P (in a TREE_LIST in LAMBDA_EXPR_CAPTURE_LIST)
 391       CONSTRUCTOR_IS_DIRECT_INIT (in CONSTRUCTOR)
 392       LAMBDA_EXPR_CAPTURES_THIS_P (in LAMBDA_EXPR)
 393       DECLTYPE_FOR_LAMBDA_CAPTURE (in DECLTYPE_TYPE)
 394       VEC_INIT_EXPR_IS_CONSTEXPR (in VEC_INIT_EXPR)
 395       DECL_OVERRIDE_P (in FUNCTION_DECL)
 396       IMPLICIT_CONV_EXPR_DIRECT_INIT (in IMPLICIT_CONV_EXPR)
 397       TRANSACTION_EXPR_IS_STMT (in TRANSACTION_EXPR)
 398       CONVERT_EXPR_VBASE_PATH (in CONVERT_EXPR)
 399       PACK_EXPANSION_LOCAL_P (in *_PACK_EXPANSION)
 400       TINFO_HAS_ACCESS_ERRORS (in TEMPLATE_INFO)
 401       SIZEOF_EXPR_TYPE_P (in SIZEOF_EXPR)
 402       COMPOUND_REQ_NOEXCEPT_P (in COMPOUND_REQ)
 403       WILDCARD_PACK_P (in WILDCARD_DECL)
 404       BLOCK_OUTER_CURLY_BRACE_P (in BLOCK)
 405       FOLD_EXPR_MODOP_P (*_FOLD_EXPR)
 406       IF_STMT_CONSTEXPR_P (IF_STMT)
 407       TEMPLATE_TYPE_PARM_FOR_CLASS (TEMPLATE_TYPE_PARM)
 408       DECL_NAMESPACE_INLINE_P (in NAMESPACE_DECL)
 409       SWITCH_STMT_ALL_CASES_P (in SWITCH_STMT)
 410       REINTERPRET_CAST_P (in NOP_EXPR)
 411       ALIGNOF_EXPR_STD_P (in ALIGNOF_EXPR)
 412       OVL_DEDUP_P (in OVERLOAD)
 413    1: IDENTIFIER_KIND_BIT_1 (in IDENTIFIER_NODE)
 414       TI_PENDING_TEMPLATE_FLAG.
 415       TEMPLATE_PARMS_FOR_INLINE.
 416       DELETE_EXPR_USE_VEC (in DELETE_EXPR).
 417       (TREE_CALLS_NEW) (in _EXPR or _REF) (commented-out).
 418       ICS_ELLIPSIS_FLAG (in _CONV)
 419       DECL_INITIALIZED_P (in VAR_DECL)
 420       TYPENAME_IS_CLASS_P (in TYPENAME_TYPE)
 421       STMT_IS_FULL_EXPR_P (in _STMT)
 422       TARGET_EXPR_LIST_INIT_P (in TARGET_EXPR)
 423       LAMBDA_EXPR_MUTABLE_P (in LAMBDA_EXPR)
 424       DECL_FINAL_P (in FUNCTION_DECL)
 425       QUALIFIED_NAME_IS_TEMPLATE (in SCOPE_REF)
 426       DECLTYPE_FOR_INIT_CAPTURE (in DECLTYPE_TYPE)
 427       TINFO_USED_TEMPLATE_ID (in TEMPLATE_INFO)
 428       PACK_EXPANSION_SIZEOF_P (in *_PACK_EXPANSION)
 429       OVL_USING_P (in OVERLOAD)
 430       IMPLICIT_CONV_EXPR_NONTYPE_ARG (in IMPLICIT_CONV_EXPR)
 431    2: IDENTIFIER_KIND_BIT_2 (in IDENTIFIER_NODE)
 432       ICS_THIS_FLAG (in _CONV)
 433       DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (in VAR_DECL)
 434       STATEMENT_LIST_TRY_BLOCK (in STATEMENT_LIST)
 435       TYPENAME_IS_RESOLVING_P (in TYPE_NAME_TYPE)
 436       TARGET_EXPR_DIRECT_INIT_P (in TARGET_EXPR)
 437       FNDECL_USED_AUTO (in FUNCTION_DECL)
 438       DECLTYPE_FOR_LAMBDA_PROXY (in DECLTYPE_TYPE)
 439       REF_PARENTHESIZED_P (in COMPONENT_REF, INDIRECT_REF, SCOPE_REF, VIEW_CONVERT_EXPR)
 440       AGGR_INIT_ZERO_FIRST (in AGGR_INIT_EXPR)
 441       CONSTRUCTOR_MUTABLE_POISON (in CONSTRUCTOR)
 442       OVL_HIDDEN_P (in OVERLOAD)
 443       SWITCH_STMT_NO_BREAK_P (in SWITCH_STMT)
 444       LAMBDA_EXPR_CAPTURE_OPTIMIZED (in LAMBDA_EXPR)
 445    3: (TREE_REFERENCE_EXPR) (in NON_LVALUE_EXPR) (commented-out).
 446       ICS_BAD_FLAG (in _CONV)
 447       FN_TRY_BLOCK_P (in TRY_BLOCK)
 448       BIND_EXPR_BODY_BLOCK (in BIND_EXPR)
 449       DECL_NONTRIVIALLY_INITIALIZED_P (in VAR_DECL)
 450       CALL_EXPR_ORDERED_ARGS (in CALL_EXPR, AGGR_INIT_EXPR)
 451       DECLTYPE_FOR_REF_CAPTURE (in DECLTYPE_TYPE)
 452       CONSTRUCTOR_C99_COMPOUND_LITERAL (in CONSTRUCTOR)
 453       OVL_NESTED_P (in OVERLOAD)
 454    4: IDENTIFIER_MARKED (IDENTIFIER_NODEs)
 455       TREE_HAS_CONSTRUCTOR (in INDIRECT_REF, SAVE_EXPR, CONSTRUCTOR,
 456           CALL_EXPR, or FIELD_DECL).
 457       DECL_TINFO_P (in VAR_DECL)
 458       FUNCTION_REF_QUALIFIED (in FUNCTION_TYPE, METHOD_TYPE)
 459       OVL_LOOKUP_P (in OVERLOAD)
 460       LOOKUP_FOUND_P (in RECORD_TYPE, UNION_TYPE, NAMESPACE_DECL)
 461    5: IDENTIFIER_VIRTUAL_P (in IDENTIFIER_NODE)
 462       DECL_VTABLE_OR_VTT_P (in VAR_DECL)
 463       FUNCTION_RVALUE_QUALIFIED (in FUNCTION_TYPE, METHOD_TYPE)
 464       CALL_EXPR_REVERSE_ARGS (in CALL_EXPR, AGGR_INIT_EXPR)
 465       CONSTRUCTOR_PLACEHOLDER_BOUNDARY (in CONSTRUCTOR)
 466    6: IDENTIFIER_REPO_CHOSEN (in IDENTIFIER_NODE)
 467       DECL_CONSTRUCTION_VTABLE_P (in VAR_DECL)
 468       TYPE_MARKED_P (in _TYPE)
 469       RANGE_FOR_IVDEP (in RANGE_FOR_STMT)
 470       CALL_EXPR_OPERATOR_SYNTAX (in CALL_EXPR, AGGR_INIT_EXPR)
 471
 472    Usage of TYPE_LANG_FLAG_?:
 473    0: TYPE_DEPENDENT_P
 474    1: TYPE_HAS_USER_CONSTRUCTOR.
 475    2: TYPE_HAS_LATE_RETURN_TYPE (in FUNCTION_TYPE, METHOD_TYPE)
 476       TYPE_PTRMEMFUNC_FLAG (in RECORD_TYPE)
 477    4: TYPE_HAS_NONTRIVIAL_DESTRUCTOR
 478    5: CLASS_TYPE_P (in RECORD_TYPE and UNION_TYPE)
 479       ENUM_FIXED_UNDERLYING_TYPE_P (in ENUMERAL_TYPE)
 480       AUTO_IS_DECLTYPE (in TEMPLATE_TYPE_PARM)
 481       REFERENCE_VLA_OK (in REFERENCE_TYPE)
 482    6: TYPE_DEPENDENT_P_VALID
 483
 484    Usage of DECL_LANG_FLAG_?:
 485    0: DECL_TEMPLATE_PARM_P (in PARM_DECL, CONST_DECL, TYPE_DECL, or TEMPLATE_DECL)
 486       DECL_LOCAL_FUNCTION_P (in FUNCTION_DECL)
 487       DECL_MUTABLE_P (in FIELD_DECL)
 488       DECL_DEPENDENT_P (in USING_DECL)
 489       LABEL_DECL_BREAK (in LABEL_DECL)
 490    1: C_TYPEDEF_EXPLICITLY_SIGNED (in TYPE_DECL).
 491       DECL_TEMPLATE_INSTANTIATED (in a VAR_DECL or a FUNCTION_DECL)
 492       DECL_MEMBER_TEMPLATE_P (in TEMPLATE_DECL)
 493       USING_DECL_TYPENAME_P (in USING_DECL)
 494       DECL_VLA_CAPTURE_P (in FIELD_DECL)
 495       DECL_ARRAY_PARAMETER_P (in PARM_DECL)
 496       LABEL_DECL_CONTINUE (in LABEL_DECL)
 497    2: DECL_THIS_EXTERN (in VAR_DECL or FUNCTION_DECL).
 498       DECL_IMPLICIT_TYPEDEF_P (in a TYPE_DECL)
 499       DECL_CONSTRAINT_VAR_P (in a PARM_DECL)
 500       TEMPLATE_DECL_COMPLEX_ALIAS_P (in TEMPLATE_DECL)
 501       DECL_INSTANTIATING_NSDMI_P (in a FIELD_DECL)
 502       LABEL_DECL_CDTOR (in LABEL_DECL)
 503    3: DECL_IN_AGGR_P.
 504    4: DECL_C_BIT_FIELD (in a FIELD_DECL)
 505       DECL_ANON_UNION_VAR_P (in a VAR_DECL)
 506       DECL_SELF_REFERENCE_P (in a TYPE_DECL)
 507       DECL_INVALID_OVERRIDER_P (in a FUNCTION_DECL)
 508    5: DECL_INTERFACE_KNOWN.
 509    6: DECL_THIS_STATIC (in VAR_DECL or FUNCTION_DECL).
 510       DECL_FIELD_IS_BASE (in FIELD_DECL)
 511       TYPE_DECL_ALIAS_P (in TYPE_DECL)
 512    7: DECL_THUNK_P (in a member FUNCTION_DECL)
 513       DECL_NORMAL_CAPTURE_P (in FIELD_DECL)
 514    8: DECL_DECLARED_CONSTEXPR_P (in VAR_DECL, FUNCTION_DECL)
 515
 516    Usage of language-independent fields in a language-dependent manner:
 517
 518    TYPE_ALIAS_SET
 519      This field is used by TYPENAME_TYPEs, TEMPLATE_TYPE_PARMs, and so
 520      forth as a substitute for the mark bits provided in `lang_type'.
 521      At present, only the six low-order bits are used.
 522
 523    TYPE_LANG_SLOT_1
 524      For a FUNCTION_TYPE or METHOD_TYPE, this is TYPE_RAISES_EXCEPTIONS.
 525      For a POINTER_TYPE (to a METHOD_TYPE), this is TYPE_PTRMEMFUNC_TYPE.
 526      For an ENUMERAL_TYPE, BOUND_TEMPLATE_TEMPLATE_PARM_TYPE,
 527      RECORD_TYPE or UNION_TYPE this is TYPE_TEMPLATE_INFO,
 528
 529   BINFO_VIRTUALS
 530      For a binfo, this is a TREE_LIST.  There is an entry for each
 531      virtual function declared either in BINFO or its direct and
 532      indirect primary bases.
 533
 534      The BV_DELTA of each node gives the amount by which to adjust the
 535      `this' pointer when calling the function.  If the method is an
 536      overridden version of a base class method, then it is assumed
 537      that, prior to adjustment, the this pointer points to an object
 538      of the base class.
 539
 540      The BV_VCALL_INDEX of each node, if non-NULL, gives the vtable
 541      index of the vcall offset for this entry.
 542
 543      The BV_FN is the declaration for the virtual function itself.
 544
 545      If BV_LOST_PRIMARY is set, it means that this entry is for a lost
 546      primary virtual base and can be left null in the vtable.
 547
 548    BINFO_VTABLE
 549      This is an expression with POINTER_TYPE that gives the value
 550      to which the vptr should be initialized.  Use get_vtbl_decl_for_binfo
 551      to extract the VAR_DECL for the complete vtable.
 552
 553    DECL_VINDEX
 554      This field is NULL for a non-virtual function.  For a virtual
 555      function, it is eventually set to an INTEGER_CST indicating the
 556      index in the vtable at which this function can be found.  When
 557      a virtual function is declared, but before it is known what
 558      function is overridden, this field is the error_mark_node.
 559
 560      Temporarily, it may be set to a TREE_LIST whose TREE_VALUE is
 561      the virtual function this one overrides, and whose TREE_CHAIN is
 562      the old DECL_VINDEX.  */
 563
 564 /* Language-specific tree checkers.  */
 565
 566 #define VAR_OR_FUNCTION_DECL_CHECK(NODE) \
 567   TREE_CHECK2(NODE,VAR_DECL,FUNCTION_DECL)
 568
 569 #define TYPE_FUNCTION_OR_TEMPLATE_DECL_CHECK(NODE) \
 570   TREE_CHECK3(NODE,TYPE_DECL,TEMPLATE_DECL,FUNCTION_DECL)
 571
 572 #define TYPE_FUNCTION_OR_TEMPLATE_DECL_P(NODE) \
 573   (TREE_CODE (NODE) == TYPE_DECL || TREE_CODE (NODE) == TEMPLATE_DECL \
 574    || TREE_CODE (NODE) == FUNCTION_DECL)
 575
 576 #define VAR_FUNCTION_OR_PARM_DECL_CHECK(NODE) \
 577   TREE_CHECK3(NODE,VAR_DECL,FUNCTION_DECL,PARM_DECL)
 578
 579 #define VAR_TEMPL_TYPE_OR_FUNCTION_DECL_CHECK(NODE) \
 580   TREE_CHECK4(NODE,VAR_DECL,FUNCTION_DECL,TYPE_DECL,TEMPLATE_DECL)
 581
 582 #define VAR_TEMPL_TYPE_FIELD_OR_FUNCTION_DECL_CHECK(NODE) \
 583   TREE_CHECK5(NODE,VAR_DECL,FIELD_DECL,FUNCTION_DECL,TYPE_DECL,TEMPLATE_DECL)
 584
 585 #define BOUND_TEMPLATE_TEMPLATE_PARM_TYPE_CHECK(NODE) \
 586   TREE_CHECK(NODE,BOUND_TEMPLATE_TEMPLATE_PARM)
 587
 588 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
 589 #define THUNK_FUNCTION_CHECK(NODE) __extension__                        \
 590 ({  __typeof (NODE) const __t = (NODE);                                 \
 591     if (TREE_CODE (__t) != FUNCTION_DECL || !__t->decl_common.lang_specific \
 592         || !__t->decl_common.lang_specific->u.fn.thunk_p)               \
 593       tree_check_failed (__t, __FILE__, __LINE__, __FUNCTION__, 0);     \
 594      __t; })
 595 #else
 596 #define THUNK_FUNCTION_CHECK(NODE) (NODE)
 597 #endif
 598 \f
 599 /* Language-dependent contents of an identifier.  */
 600
 601 struct GTY(()) lang_identifier {
 602   struct c_common_identifier c_common;
 603   cxx_binding *bindings;
 604 };
 605
 606 /* Return a typed pointer version of T if it designates a
 607    C++ front-end identifier.  */
 608 inline lang_identifier*
 609 identifier_p (tree t)
 610 {
 611   if (TREE_CODE (t) == IDENTIFIER_NODE)
 612     return (lang_identifier*) t;
 613   return NULL;
 614 }
 615
 616 #define LANG_IDENTIFIER_CAST(NODE) \
 617         ((struct lang_identifier*)IDENTIFIER_NODE_CHECK (NODE))
 618
 619 struct GTY(()) template_parm_index {
 620   struct tree_common common;
 621   int index;
 622   int level;
 623   int orig_level;
 624   tree decl;
 625 };
 626
 627 struct GTY(()) ptrmem_cst {
 628   struct tree_common common;
 629   tree member;
 630 };
 631 typedef struct ptrmem_cst * ptrmem_cst_t;
 632
 633 #define CLEANUP_P(NODE)         TREE_LANG_FLAG_0 (TRY_BLOCK_CHECK (NODE))
 634
 635 #define BIND_EXPR_TRY_BLOCK(NODE) \
 636   TREE_LANG_FLAG_0 (BIND_EXPR_CHECK (NODE))
 637
 638 /* Used to mark the block around the member initializers and cleanups.  */
 639 #define BIND_EXPR_BODY_BLOCK(NODE) \
 640   TREE_LANG_FLAG_3 (BIND_EXPR_CHECK (NODE))
 641 #define FUNCTION_NEEDS_BODY_BLOCK(NODE) \
 642   (DECL_CONSTRUCTOR_P (NODE) || DECL_DESTRUCTOR_P (NODE) \
 643    || LAMBDA_FUNCTION_P (NODE))
 644
 645 #define STATEMENT_LIST_NO_SCOPE(NODE) \
 646   TREE_LANG_FLAG_0 (STATEMENT_LIST_CHECK (NODE))
 647 #define STATEMENT_LIST_TRY_BLOCK(NODE) \
 648   TREE_LANG_FLAG_2 (STATEMENT_LIST_CHECK (NODE))
 649
 650 /* Mark the outer curly brace BLOCK.  */
 651 #define BLOCK_OUTER_CURLY_BRACE_P(NODE) TREE_LANG_FLAG_0 (BLOCK_CHECK (NODE))
 652
 653 /* Nonzero if this statement should be considered a full-expression,
 654    i.e., if temporaries created during this statement should have
 655    their destructors run at the end of this statement.  */
 656 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 657
 658 /* Marks the result of a statement expression.  */
 659 #define EXPR_STMT_STMT_EXPR_RESULT(NODE) \
 660   TREE_LANG_FLAG_0 (EXPR_STMT_CHECK (NODE))
 661
 662 /* Nonzero if this statement-expression does not have an associated scope.  */
 663 #define STMT_EXPR_NO_SCOPE(NODE) \
 664    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
 665
 666 #define COND_EXPR_IS_VEC_DELETE(NODE) \
 667   TREE_LANG_FLAG_0 (COND_EXPR_CHECK (NODE))
 668
 669 /* Nonzero if this NOP_EXPR is a reinterpret_cast.  Such conversions
 670    are not constexprs.  Other NOP_EXPRs are.  */
 671 #define REINTERPRET_CAST_P(NODE)                \
 672   TREE_LANG_FLAG_0 (NOP_EXPR_CHECK (NODE))
 673
 674 /* Returns nonzero iff TYPE1 and TYPE2 are the same type, in the usual
 675    sense of `same'.  */
 676 #define same_type_p(TYPE1, TYPE2) \
 677   comptypes ((TYPE1), (TYPE2), COMPARE_STRICT)
 678
 679 /* Returns nonzero iff NODE is a declaration for the global function
 680    `main'.  */
 681 #define DECL_MAIN_P(NODE)                               \
 682    (DECL_EXTERN_C_FUNCTION_P (NODE)                     \
 683     && DECL_NAME (NODE) != NULL_TREE                    \
 684     && MAIN_NAME_P (DECL_NAME (NODE))                   \
 685     && flag_hosted)
 686
 687 /* Lookup walker marking.  */
 688 #define LOOKUP_SEEN_P(NODE) TREE_VISITED(NODE)
 689 #define LOOKUP_FOUND_P(NODE) \
 690   TREE_LANG_FLAG_4 (TREE_CHECK3(NODE,RECORD_TYPE,UNION_TYPE,NAMESPACE_DECL))
 691
 692 /* These two accessors should only be used by OVL manipulators.
 693    Other users should use iterators and convenience functions.  */
 694 #define OVL_FUNCTION(NODE) \
 695   (((struct tree_overload*)OVERLOAD_CHECK (NODE))->function)
 696 #define OVL_CHAIN(NODE) \
 697   (((struct tree_overload*)OVERLOAD_CHECK (NODE))->common.chain)
 698
 699 /* If set, this or a subsequent overload contains decls that need deduping.  */
 700 #define OVL_DEDUP_P(NODE)       TREE_LANG_FLAG_0 (OVERLOAD_CHECK (NODE))
 701 /* If set, this was imported in a using declaration.   */
 702 #define OVL_USING_P(NODE)       TREE_LANG_FLAG_1 (OVERLOAD_CHECK (NODE))
 703 /* If set, this overload is a hidden decl.  */
 704 #define OVL_HIDDEN_P(NODE)      TREE_LANG_FLAG_2 (OVERLOAD_CHECK (NODE))
 705 /* If set, this overload contains a nested overload.  */
 706 #define OVL_NESTED_P(NODE)      TREE_LANG_FLAG_3 (OVERLOAD_CHECK (NODE))
 707 /* If set, this overload was constructed during lookup.  */
 708 #define OVL_LOOKUP_P(NODE)      TREE_LANG_FLAG_4 (OVERLOAD_CHECK (NODE))
 709 /* If set, this is a persistant lookup. */
 710 #define OVL_USED_P(NODE)        TREE_USED (OVERLOAD_CHECK (NODE))
 711
 712 /* The first decl of an overload.  */
 713 #define OVL_FIRST(NODE) ovl_first (NODE)
 714 /* The name of the overload set.  */
 715 #define OVL_NAME(NODE) DECL_NAME (OVL_FIRST (NODE))
 716
 717 /* Whether this is a set of overloaded functions.  TEMPLATE_DECLS are
 718    always wrapped in an OVERLOAD, so we don't need to check them
 719    here.  */
 720 #define OVL_P(NODE) \
 721   (TREE_CODE (NODE) == FUNCTION_DECL || TREE_CODE (NODE) == OVERLOAD)
 722 /* Whether this is a single member overload.  */
 723 #define OVL_SINGLE_P(NODE) \
 724   (TREE_CODE (NODE) != OVERLOAD || !OVL_CHAIN (NODE))
 725
 726 /* OVL_HIDDEN_P nodes come first, then OVL_USING_P nodes, then regular
 727    fns.  */
 728
 729 struct GTY(()) tree_overload {
 730   struct tree_common common;
 731   tree function;
 732 };
 733
 734 /* Iterator for a 1 dimensional overload.  Permits iterating over the
 735    outer level of a 2-d overload when explicitly enabled.  */
 736
 737 class ovl_iterator
 738 {
 739   tree ovl;
 740   const bool allow_inner; /* Only used when checking.  */
 741
 742  public:
 743   explicit ovl_iterator (tree o, bool allow = false)
 744     : ovl (o), allow_inner (allow)
 745   {
 746   }
 747
 748  private:
 749   /* Do not duplicate.  */
 750   ovl_iterator &operator= (const ovl_iterator &);
 751   ovl_iterator (const ovl_iterator &);
 752
 753  public:
 754   operator bool () const
 755   {
 756     return ovl;
 757   }
 758   ovl_iterator &operator++ ()
 759   {
 760     ovl = TREE_CODE (ovl) != OVERLOAD ? NULL_TREE : OVL_CHAIN (ovl);
 761     return *this;
 762   }
 763   tree operator* () const
 764   {
 765     tree fn = TREE_CODE (ovl) != OVERLOAD ? ovl : OVL_FUNCTION (ovl);
 766
 767     /* Check this is not an unexpected 2-dimensional overload.  */
 768     gcc_checking_assert (allow_inner || TREE_CODE (fn) != OVERLOAD);
 769
 770     return fn;
 771   }
 772
 773  public:
 774   /* Whether this overload was introduced by a using decl.  */
 775   bool using_p () const
 776   {
 777     return TREE_CODE (ovl) == OVERLOAD && OVL_USING_P (ovl);
 778   }
 779   bool hidden_p () const
 780   {
 781     return TREE_CODE (ovl) == OVERLOAD && OVL_HIDDEN_P (ovl);
 782   }
 783
 784  public:
 785   tree remove_node (tree head)
 786   {
 787     return remove_node (head, ovl);
 788   }
 789   tree reveal_node (tree head)
 790   {
 791     return reveal_node (head, ovl);
 792   }
 793
 794  protected:
 795   /* If we have a nested overload, point at the inner overload and
 796      return the next link on the outer one.  */
 797   tree maybe_push ()
 798   {
 799     tree r = NULL_TREE;
 800
 801     if (ovl && TREE_CODE (ovl) == OVERLOAD && OVL_NESTED_P (ovl))
 802       {
 803         r = OVL_CHAIN (ovl);
 804         ovl = OVL_FUNCTION (ovl);
 805       }
 806     return r;
 807   }
 808   /* Restore an outer nested overload.  */
 809   void pop (tree outer)
 810   {
 811     gcc_checking_assert (!ovl);
 812     ovl = outer;
 813   }
 814
 815  private:
 816   /* We make these static functions to avoid the address of the
 817      iterator escaping the local context.  */
 818   static tree remove_node (tree head, tree node);
 819   static tree reveal_node (tree ovl, tree node);
 820 };
 821
 822 /* Iterator over a (potentially) 2 dimensional overload, which is
 823    produced by name lookup.  */
 824
 825 class lkp_iterator : public ovl_iterator
 826 {
 827   typedef ovl_iterator parent;
 828
 829   tree outer;
 830
 831  public:
 832   explicit lkp_iterator (tree o)
 833     : parent (o, true), outer (maybe_push ())
 834   {
 835   }
 836
 837  public:
 838   lkp_iterator &operator++ ()
 839   {
 840     bool repush = !outer;
 841
 842     if (!parent::operator++ () && !repush)
 843       {
 844         pop (outer);
 845         repush = true;
 846       }
 847
 848     if (repush)
 849       outer = maybe_push ();
 850
 851     return *this;
 852   }
 853 };
 854
 855 /* hash traits for declarations.  Hashes potential overload sets via
 856    DECL_NAME.  */
 857
 858 struct named_decl_hash : ggc_remove <tree>
 859 {
 860   typedef tree value_type; /* A DECL or OVERLOAD  */
 861   typedef tree compare_type; /* An identifier.  */
 862
 863   inline static hashval_t hash (const value_type decl);
 864   inline static bool equal (const value_type existing, compare_type candidate);
 865
 866   static inline void mark_empty (value_type &p) {p = NULL_TREE;}
 867   static inline bool is_empty (value_type p) {return !p;}
 868
 869   /* Nothing is deletable.  Everything is insertable.  */
 870   static bool is_deleted (value_type) { return false; }
 871   static void mark_deleted (value_type) { gcc_unreachable (); }
 872 };
 873
 874 struct GTY(()) tree_template_decl {
 875   struct tree_decl_common common;
 876   tree arguments;
 877   tree result;
 878 };
 879
 880 /* Returns true iff NODE is a BASELINK.  */
 881 #define BASELINK_P(NODE) \
 882   (TREE_CODE (NODE) == BASELINK)
 883 /* The BINFO indicating the base in which lookup found the
 884    BASELINK_FUNCTIONS.  */
 885 #define BASELINK_BINFO(NODE) \
 886   (((struct tree_baselink*) BASELINK_CHECK (NODE))->binfo)
 887 /* The functions referred to by the BASELINK; either a FUNCTION_DECL,
 888    a TEMPLATE_DECL, an OVERLOAD, or a TEMPLATE_ID_EXPR.  */
 889 #define BASELINK_FUNCTIONS(NODE) \
 890   (((struct tree_baselink*) BASELINK_CHECK (NODE))->functions)
 891 /* If T is a BASELINK, grab the functions, otherwise just T, which is
 892    expected to already be a (list of) functions.  */
 893 #define MAYBE_BASELINK_FUNCTIONS(T) \
 894   (BASELINK_P (T) ? BASELINK_FUNCTIONS (T) : T)
 895 /* The BINFO in which the search for the functions indicated by this baselink
 896    began.  This base is used to determine the accessibility of functions
 897    selected by overload resolution.  */
 898 #define BASELINK_ACCESS_BINFO(NODE) \
 899   (((struct tree_baselink*) BASELINK_CHECK (NODE))->access_binfo)
 900 /* For a type-conversion operator, the BASELINK_OPTYPE indicates the type
 901    to which the conversion should occur.  This value is important if
 902    the BASELINK_FUNCTIONS include a template conversion operator --
 903    the BASELINK_OPTYPE can be used to determine what type the user
 904    requested.  */
 905 #define BASELINK_OPTYPE(NODE) \
 906   (TREE_CHAIN (BASELINK_CHECK (NODE)))
 907 /* Nonzero if this baselink was from a qualified lookup.  */
 908 #define BASELINK_QUALIFIED_P(NODE) \
 909   TREE_LANG_FLAG_0 (BASELINK_CHECK (NODE))
 910
 911 struct GTY(()) tree_baselink {
 912   struct tree_common common;
 913   tree binfo;
 914   tree functions;
 915   tree access_binfo;
 916 };
 917
 918 /* The different kinds of ids that we encounter.  */
 919
 920 enum cp_id_kind
 921 {
 922   /* Not an id at all.  */
 923   CP_ID_KIND_NONE,
 924   /* An unqualified-id that is not a template-id.  */
 925   CP_ID_KIND_UNQUALIFIED,
 926   /* An unqualified-id that is a dependent name.  */
 927   CP_ID_KIND_UNQUALIFIED_DEPENDENT,
 928   /* An unqualified template-id.  */
 929   CP_ID_KIND_TEMPLATE_ID,
 930   /* A qualified-id.  */
 931   CP_ID_KIND_QUALIFIED
 932 };
 933
 934
 935 /* The various kinds of C++0x warnings we encounter. */
 936
 937 enum cpp0x_warn_str
 938 {
 939   /* extended initializer lists */
 940   CPP0X_INITIALIZER_LISTS,
 941   /* explicit conversion operators */
 942   CPP0X_EXPLICIT_CONVERSION,
 943   /* variadic templates */
 944   CPP0X_VARIADIC_TEMPLATES,
 945   /* lambda expressions */
 946   CPP0X_LAMBDA_EXPR,
 947   /* C++0x auto */
 948   CPP0X_AUTO,
 949   /* scoped enums */
 950   CPP0X_SCOPED_ENUMS,
 951   /* defaulted and deleted functions */
 952   CPP0X_DEFAULTED_DELETED,
 953   /* inline namespaces */
 954   CPP0X_INLINE_NAMESPACES,
 955   /* override controls, override/final */
 956   CPP0X_OVERRIDE_CONTROLS,
 957   /* non-static data member initializers */
 958   CPP0X_NSDMI,
 959   /* user defined literals */
 960   CPP0X_USER_DEFINED_LITERALS,
 961   /* delegating constructors */
 962   CPP0X_DELEGATING_CTORS,
 963   /* inheriting constructors */
 964   CPP0X_INHERITING_CTORS,
 965   /* C++11 attributes */
 966   CPP0X_ATTRIBUTES,
 967   /* ref-qualified member functions */
 968   CPP0X_REF_QUALIFIER
 969 };
 970
 971 /* The various kinds of operation used by composite_pointer_type. */
 972
 973 enum composite_pointer_operation
 974 {
 975   /* comparison */
 976   CPO_COMPARISON,
 977   /* conversion */
 978   CPO_CONVERSION,
 979   /* conditional expression */
 980   CPO_CONDITIONAL_EXPR
 981 };
 982
 983 /* Possible cases of expression list used by build_x_compound_expr_from_list. */
 984 enum expr_list_kind {
 985   ELK_INIT,             /* initializer */
 986   ELK_MEM_INIT,         /* member initializer */
 987   ELK_FUNC_CAST         /* functional cast */
 988 };
 989
 990 /* Possible cases of implicit bad rhs conversions. */
 991 enum impl_conv_rhs {
 992   ICR_DEFAULT_ARGUMENT, /* default argument */
 993   ICR_CONVERTING,       /* converting */
 994   ICR_INIT,             /* initialization */
 995   ICR_ARGPASS,          /* argument passing */
 996   ICR_RETURN,           /* return */
 997   ICR_ASSIGN            /* assignment */
 998 };
 999
1000 /* Possible cases of implicit or explicit bad conversions to void. */
1001 enum impl_conv_void {
1002   ICV_CAST,            /* (explicit) conversion to void */
1003   ICV_SECOND_OF_COND,  /* second operand of conditional expression */
1004   ICV_THIRD_OF_COND,   /* third operand of conditional expression */
1005   ICV_RIGHT_OF_COMMA,  /* right operand of comma operator */
1006   ICV_LEFT_OF_COMMA,   /* left operand of comma operator */
1007   ICV_STATEMENT,       /* statement */
1008   ICV_THIRD_IN_FOR     /* for increment expression */
1009 };
1010
1011 /* Possible invalid uses of an abstract class that might not have a
1012    specific associated declaration.  */
1013 enum GTY(()) abstract_class_use {
1014   ACU_UNKNOWN,                  /* unknown or decl provided */
1015   ACU_CAST,                     /* cast to abstract class */
1016   ACU_NEW,                      /* new-expression of abstract class */
1017   ACU_THROW,                    /* throw-expression of abstract class */
1018   ACU_CATCH,                    /* catch-parameter of abstract class */
1019   ACU_ARRAY,                    /* array of abstract class */
1020   ACU_RETURN,                   /* return type of abstract class */
1021   ACU_PARM                      /* parameter type of abstract class */
1022 };
1023
1024 /* Macros for access to language-specific slots in an identifier.  */
1025
1026 /* The IDENTIFIER_BINDING is the innermost cxx_binding for the
1027     identifier.  Its PREVIOUS is the next outermost binding.  Each
1028     VALUE field is a DECL for the associated declaration.  Thus,
1029     name lookup consists simply of pulling off the node at the front
1030     of the list (modulo oddities for looking up the names of types,
1031     and such.)  You can use SCOPE field to determine the scope
1032     that bound the name.  */
1033 #define IDENTIFIER_BINDING(NODE) \
1034   (LANG_IDENTIFIER_CAST (NODE)->bindings)
1035
1036 /* TREE_TYPE only indicates on local and class scope the current
1037    type. For namespace scope, the presence of a type in any namespace
1038    is indicated with global_type_node, and the real type behind must
1039    be found through lookup.  */
1040 #define IDENTIFIER_TYPE_VALUE(NODE) identifier_type_value (NODE)
1041 #define REAL_IDENTIFIER_TYPE_VALUE(NODE) TREE_TYPE (NODE)
1042 #define SET_IDENTIFIER_TYPE_VALUE(NODE,TYPE) (TREE_TYPE (NODE) = (TYPE))
1043 #define IDENTIFIER_HAS_TYPE_VALUE(NODE) (IDENTIFIER_TYPE_VALUE (NODE) ? 1 : 0)
1044
1045 /* Kinds of identifiers.  Values are carefully chosen.  */
1046 enum cp_identifier_kind {
1047   cik_normal = 0,       /* Not a special identifier.  */
1048   cik_keyword = 1,      /* A keyword.  */
1049   cik_ctor = 2,         /* Constructor (in-chg, complete or base).  */
1050   cik_dtor = 3,         /* Destructor (in-chg, deleting, complete or
1051                            base).  */
1052   cik_simple_op = 4,    /* Non-assignment operator name.  */
1053   cik_assign_op = 5,    /* An assignment operator name.  */
1054   cik_conv_op = 6,      /* Conversion operator name.  */
1055   cik_reserved_for_udlit = 7,   /* Not yet in use  */
1056   cik_max
1057 };
1058
1059 /* Kind bits.  */
1060 #define IDENTIFIER_KIND_BIT_0(NODE) \
1061   TREE_LANG_FLAG_0 (IDENTIFIER_NODE_CHECK (NODE))
1062 #define IDENTIFIER_KIND_BIT_1(NODE) \
1063   TREE_LANG_FLAG_1 (IDENTIFIER_NODE_CHECK (NODE))
1064 #define IDENTIFIER_KIND_BIT_2(NODE) \
1065   TREE_LANG_FLAG_2 (IDENTIFIER_NODE_CHECK (NODE))
1066
1067 /* Used by various search routines.  */
1068 #define IDENTIFIER_MARKED(NODE) \
1069   TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (NODE))
1070
1071 /* Nonzero if this identifier is used as a virtual function name somewhere
1072    (optimizes searches).  */
1073 #define IDENTIFIER_VIRTUAL_P(NODE) \
1074   TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (NODE))
1075
1076 /* True iff NAME is the DECL_ASSEMBLER_NAME for an entity with vague
1077    linkage which the prelinker has assigned to this translation
1078    unit.  */
1079 #define IDENTIFIER_REPO_CHOSEN(NAME) \
1080   (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (NAME)))
1081
1082 /* True if this identifier is a reserved word.  C_RID_CODE (node) is
1083    then the RID_* value of the keyword.  Value 1.  */
1084 #define IDENTIFIER_KEYWORD_P(NODE)              \
1085   ((!IDENTIFIER_KIND_BIT_2 (NODE))              \
1086    & (!IDENTIFIER_KIND_BIT_1 (NODE))            \
1087    & IDENTIFIER_KIND_BIT_0 (NODE))
1088
1089 /* True if this identifier is the name of a constructor or
1090    destructor.  Value 2 or 3.  */
1091 #define IDENTIFIER_CDTOR_P(NODE)                \
1092   ((!IDENTIFIER_KIND_BIT_2 (NODE))              \
1093    & IDENTIFIER_KIND_BIT_1 (NODE))
1094
1095 /* True if this identifier is the name of a constructor.  Value 2.  */
1096 #define IDENTIFIER_CTOR_P(NODE)                 \
1097   (IDENTIFIER_CDTOR_P(NODE)                     \
1098     & (!IDENTIFIER_KIND_BIT_0 (NODE)))
1099
1100 /* True if this identifier is the name of a destructor.  Value 3.  */
1101 #define IDENTIFIER_DTOR_P(NODE)                 \
1102   (IDENTIFIER_CDTOR_P(NODE)                     \
1103     & IDENTIFIER_KIND_BIT_0 (NODE))
1104
1105 /* True if this identifier is for any operator name (including
1106    conversions).  Value 4, 5, 6 or 7.  */
1107 #define IDENTIFIER_ANY_OP_P(NODE)               \
1108   (IDENTIFIER_KIND_BIT_2 (NODE))
1109
1110 /* True if this identifier is for an overloaded operator. Values 4, 5.  */
1111 #define IDENTIFIER_OVL_OP_P(NODE)               \
1112   (IDENTIFIER_ANY_OP_P (NODE)                   \
1113    & (!IDENTIFIER_KIND_BIT_1 (NODE)))
1114
1115 /* True if this identifier is for any assignment. Values 5.  */
1116 #define IDENTIFIER_ASSIGN_OP_P(NODE)            \
1117   (IDENTIFIER_OVL_OP_P (NODE)                   \
1118    & IDENTIFIER_KIND_BIT_0 (NODE))
1119
1120 /* True if this identifier is the name of a type-conversion
1121    operator.  Value 7.  */
1122 #define IDENTIFIER_CONV_OP_P(NODE)              \
1123   (IDENTIFIER_ANY_OP_P (NODE)                   \
1124    & IDENTIFIER_KIND_BIT_1 (NODE)               \
1125    & (!IDENTIFIER_KIND_BIT_0 (NODE)))
1126
1127 /* True if this identifier is a new or delete operator.  */
1128 #define IDENTIFIER_NEWDEL_OP_P(NODE)            \
1129   (IDENTIFIER_OVL_OP_P (NODE)                   \
1130    && IDENTIFIER_OVL_OP_FLAGS (NODE) & OVL_OP_FLAG_ALLOC)
1131
1132 /* True if this identifier is a new operator.  */
1133 #define IDENTIFIER_NEW_OP_P(NODE)                                       \
1134   (IDENTIFIER_OVL_OP_P (NODE)                                           \
1135    && (IDENTIFIER_OVL_OP_FLAGS (NODE)                                   \
1136        & (OVL_OP_FLAG_ALLOC | OVL_OP_FLAG_DELETE)) == OVL_OP_FLAG_ALLOC)
1137
1138 /* Access a C++-specific index for identifier NODE.
1139    Used to optimize operator mappings etc.  */
1140 #define IDENTIFIER_CP_INDEX(NODE)               \
1141   (IDENTIFIER_NODE_CHECK(NODE)->base.u.bits.address_space)
1142
1143 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
1144 #define C_TYPE_FIELDS_READONLY(TYPE) \
1145   (LANG_TYPE_CLASS_CHECK (TYPE)->fields_readonly)
1146
1147 /* The tokens stored in the default argument.  */
1148
1149 #define DEFARG_TOKENS(NODE) \
1150   (((struct tree_default_arg *)DEFAULT_ARG_CHECK (NODE))->tokens)
1151 #define DEFARG_INSTANTIATIONS(NODE) \
1152   (((struct tree_default_arg *)DEFAULT_ARG_CHECK (NODE))->instantiations)
1153
1154 struct GTY (()) tree_default_arg {
1155   struct tree_common common;
1156   struct cp_token_cache *tokens;
1157   vec<tree, va_gc> *instantiations;
1158 };
1159
1160
1161 #define DEFERRED_NOEXCEPT_PATTERN(NODE) \
1162   (((struct tree_deferred_noexcept *)DEFERRED_NOEXCEPT_CHECK (NODE))->pattern)
1163 #define DEFERRED_NOEXCEPT_ARGS(NODE) \
1164   (((struct tree_deferred_noexcept *)DEFERRED_NOEXCEPT_CHECK (NODE))->args)
1165 #define DEFERRED_NOEXCEPT_SPEC_P(NODE)                          \
1166   ((NODE) && (TREE_PURPOSE (NODE))                              \
1167    && (TREE_CODE (TREE_PURPOSE (NODE)) == DEFERRED_NOEXCEPT))
1168 #define UNEVALUATED_NOEXCEPT_SPEC_P(NODE)                               \
1169   (DEFERRED_NOEXCEPT_SPEC_P (NODE)                                      \
1170    && DEFERRED_NOEXCEPT_PATTERN (TREE_PURPOSE (NODE)) == NULL_TREE)
1171
1172 struct GTY (()) tree_deferred_noexcept {
1173   struct tree_base base;
1174   tree pattern;
1175   tree args;
1176 };
1177
1178
1179 /* The condition associated with the static assertion.  This must be
1180    an integral constant expression.  */
1181 #define STATIC_ASSERT_CONDITION(NODE) \
1182   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->condition)
1183
1184 /* The message associated with the static assertion.  This must be a
1185    string constant, which will be emitted as an error message when the
1186    static assert condition is false.  */
1187 #define STATIC_ASSERT_MESSAGE(NODE) \
1188   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->message)
1189
1190 /* Source location information for a static assertion.  */
1191 #define STATIC_ASSERT_SOURCE_LOCATION(NODE) \
1192   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->location)
1193
1194 struct GTY (()) tree_static_assert {
1195   struct tree_common common;
1196   tree condition;
1197   tree message;
1198   location_t location;
1199 };
1200
1201 struct GTY (()) tree_argument_pack_select {
1202   struct tree_common common;
1203   tree argument_pack;
1204   int index;
1205 };
1206
1207 /* The different kinds of traits that we encounter.  */
1208
1209 enum cp_trait_kind
1210 {
1211   CPTK_BASES,
1212   CPTK_DIRECT_BASES,
1213   CPTK_HAS_NOTHROW_ASSIGN,
1214   CPTK_HAS_NOTHROW_CONSTRUCTOR,
1215   CPTK_HAS_NOTHROW_COPY,
1216   CPTK_HAS_TRIVIAL_ASSIGN,
1217   CPTK_HAS_TRIVIAL_CONSTRUCTOR,
1218   CPTK_HAS_TRIVIAL_COPY,
1219   CPTK_HAS_TRIVIAL_DESTRUCTOR,
1220   CPTK_HAS_UNIQUE_OBJ_REPRESENTATIONS,
1221   CPTK_HAS_VIRTUAL_DESTRUCTOR,
1222   CPTK_IS_ABSTRACT,
1223   CPTK_IS_AGGREGATE,
1224   CPTK_IS_BASE_OF,
1225   CPTK_IS_CLASS,
1226   CPTK_IS_EMPTY,
1227   CPTK_IS_ENUM,
1228   CPTK_IS_FINAL,
1229   CPTK_IS_LITERAL_TYPE,
1230   CPTK_IS_POD,
1231   CPTK_IS_POLYMORPHIC,
1232   CPTK_IS_SAME_AS,
1233   CPTK_IS_STD_LAYOUT,
1234   CPTK_IS_TRIVIAL,
1235   CPTK_IS_TRIVIALLY_ASSIGNABLE,
1236   CPTK_IS_TRIVIALLY_CONSTRUCTIBLE,
1237   CPTK_IS_TRIVIALLY_COPYABLE,
1238   CPTK_IS_UNION,
1239   CPTK_UNDERLYING_TYPE,
1240   CPTK_IS_ASSIGNABLE,
1241   CPTK_IS_CONSTRUCTIBLE
1242 };
1243
1244 /* The types that we are processing.  */
1245 #define TRAIT_EXPR_TYPE1(NODE) \
1246   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->type1)
1247
1248 #define TRAIT_EXPR_TYPE2(NODE) \
1249   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->type2)
1250
1251 /* The specific trait that we are processing.  */
1252 #define TRAIT_EXPR_KIND(NODE) \
1253   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->kind)
1254
1255 struct GTY (()) tree_trait_expr {
1256   struct tree_common common;
1257   tree type1;
1258   tree type2;
1259   enum cp_trait_kind kind;
1260 };
1261
1262 /* Based off of TYPE_UNNAMED_P.  */
1263 #define LAMBDA_TYPE_P(NODE) \
1264   (CLASS_TYPE_P (NODE) && CLASSTYPE_LAMBDA_EXPR (NODE))
1265
1266 /* Test if FUNCTION_DECL is a lambda function.  */
1267 #define LAMBDA_FUNCTION_P(FNDECL)                               \
1268   (DECL_DECLARES_FUNCTION_P (FNDECL)                            \
1269    && DECL_OVERLOADED_OPERATOR_P (FNDECL)                       \
1270    && DECL_OVERLOADED_OPERATOR_IS (FNDECL, CALL_EXPR)           \
1271    && LAMBDA_TYPE_P (CP_DECL_CONTEXT (FNDECL)))
1272
1273 enum cp_lambda_default_capture_mode_type {
1274   CPLD_NONE,
1275   CPLD_COPY,
1276   CPLD_REFERENCE
1277 };
1278
1279 /* The method of default capture, if any.  */
1280 #define LAMBDA_EXPR_DEFAULT_CAPTURE_MODE(NODE) \
1281   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->default_capture_mode)
1282
1283 /* The capture-list, including `this'.  Each capture is stored as a FIELD_DECL
1284  * so that the name, type, and field are all together, whether or not it has
1285  * been added to the lambda's class type.
1286    TREE_LIST:
1287      TREE_PURPOSE: The FIELD_DECL for this capture.
1288      TREE_VALUE: The initializer. This is part of a GNU extension.  */
1289 #define LAMBDA_EXPR_CAPTURE_LIST(NODE) \
1290   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->capture_list)
1291
1292 /* During parsing of the lambda-introducer, the node in the capture-list
1293    that holds the 'this' capture.  During parsing of the body, the
1294    capture proxy for that node.  */
1295 #define LAMBDA_EXPR_THIS_CAPTURE(NODE) \
1296   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->this_capture)
1297
1298 /* Predicate tracking whether `this' is in the effective capture set.  */
1299 #define LAMBDA_EXPR_CAPTURES_THIS_P(NODE) \
1300   LAMBDA_EXPR_THIS_CAPTURE(NODE)
1301
1302 /* Predicate tracking whether the lambda was declared 'mutable'.  */
1303 #define LAMBDA_EXPR_MUTABLE_P(NODE) \
1304   TREE_LANG_FLAG_1 (LAMBDA_EXPR_CHECK (NODE))
1305
1306 /* True iff uses of a const variable capture were optimized away.  */
1307 #define LAMBDA_EXPR_CAPTURE_OPTIMIZED(NODE) \
1308   TREE_LANG_FLAG_2 (LAMBDA_EXPR_CHECK (NODE))
1309
1310 /* True if this TREE_LIST in LAMBDA_EXPR_CAPTURE_LIST is for an explicit
1311    capture.  */
1312 #define LAMBDA_CAPTURE_EXPLICIT_P(NODE) \
1313   TREE_LANG_FLAG_0 (TREE_LIST_CHECK (NODE))
1314
1315 /* The source location of the lambda.  */
1316 #define LAMBDA_EXPR_LOCATION(NODE) \
1317   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->locus)
1318
1319 /* The mangling scope for the lambda: FUNCTION_DECL, PARM_DECL, VAR_DECL,
1320    FIELD_DECL or NULL_TREE.  If this is NULL_TREE, we have no linkage.  */
1321 #define LAMBDA_EXPR_EXTRA_SCOPE(NODE) \
1322   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->extra_scope)
1323
1324 /* If EXTRA_SCOPE, this is the number of the lambda within that scope.  */
1325 #define LAMBDA_EXPR_DISCRIMINATOR(NODE) \
1326   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->discriminator)
1327
1328 /* During parsing of the lambda, a vector of capture proxies which need
1329    to be pushed once we're done processing a nested lambda.  */
1330 #define LAMBDA_EXPR_PENDING_PROXIES(NODE) \
1331   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->pending_proxies)
1332
1333 /* The closure type of the lambda, which is also the type of the
1334    LAMBDA_EXPR.  */
1335 #define LAMBDA_EXPR_CLOSURE(NODE) \
1336   (TREE_TYPE (LAMBDA_EXPR_CHECK (NODE)))
1337
1338 struct GTY (()) tree_lambda_expr
1339 {
1340   struct tree_typed typed;
1341   tree capture_list;
1342   tree this_capture;
1343   tree extra_scope;
1344   vec<tree, va_gc> *pending_proxies;
1345   location_t locus;
1346   enum cp_lambda_default_capture_mode_type default_capture_mode;
1347   int discriminator;
1348 };
1349
1350 /* A (typedef,context,usage location) triplet.
1351    It represents a typedef used through a
1352    context at a given source location.
1353    e.g.
1354    struct foo {
1355      typedef int myint;
1356    };
1357
1358    struct bar {
1359     foo::myint v; // #1<-- this location.
1360    };
1361
1362    In bar, the triplet will be (myint, foo, #1).
1363    */
1364 struct GTY(()) qualified_typedef_usage_s {
1365   tree typedef_decl;
1366   tree context;
1367   location_t locus;
1368 };
1369 typedef struct qualified_typedef_usage_s qualified_typedef_usage_t;
1370
1371 /* Non-zero if this template specialization has access violations that
1372    should be rechecked when the function is instantiated outside argument
1373    deduction.  */
1374 #define TINFO_HAS_ACCESS_ERRORS(NODE) \
1375   (TREE_LANG_FLAG_0 (TEMPLATE_INFO_CHECK (NODE)))
1376 #define FNDECL_HAS_ACCESS_ERRORS(NODE) \
1377   (TINFO_HAS_ACCESS_ERRORS (DECL_TEMPLATE_INFO (NODE)))
1378
1379 /* Non-zero if this variable template specialization was specified using a
1380    template-id, so it's a partial or full specialization and not a definition
1381    of the member template of a particular class specialization.  */
1382 #define TINFO_USED_TEMPLATE_ID(NODE) \
1383   (TREE_LANG_FLAG_1 (TEMPLATE_INFO_CHECK (NODE)))
1384
1385 struct GTY(()) tree_template_info {
1386   struct tree_common common;
1387   vec<qualified_typedef_usage_t, va_gc> *typedefs_needing_access_checking;
1388 };
1389
1390 // Constraint information for a C++ declaration. Constraint information is
1391 // comprised of:
1392 //
1393 // - a constraint expression introduced by the template header
1394 // - a constraint expression introduced by a function declarator
1395 // - the associated constraints, which are the conjunction of those,
1396 //   and used for declaration matching
1397 //
1398 // The template and declarator requirements are kept to support pretty
1399 // printing constrained declarations.
1400 struct GTY(()) tree_constraint_info {
1401   struct tree_base base;
1402   tree template_reqs;
1403   tree declarator_reqs;
1404   tree associated_constr;
1405 };
1406
1407 // Require that pointer P is non-null before returning.
1408 template<typename T>
1409 inline T*
1410 check_nonnull (T* p)
1411 {
1412   gcc_assert (p);
1413   return p;
1414 }
1415
1416 // Returns true iff T is non-null and represents constraint info.
1417 inline tree_constraint_info *
1418 check_constraint_info (tree t)
1419 {
1420   if (t && TREE_CODE (t) == CONSTRAINT_INFO)
1421     return (tree_constraint_info *)t;
1422   return NULL;
1423 }
1424
1425 // Access the expression describing the template constraints. This may be
1426 // null if no constraints were introduced in the template parameter list,
1427 // a requirements clause after the template parameter list, or constraints
1428 // through a constrained-type-specifier.
1429 #define CI_TEMPLATE_REQS(NODE) \
1430   check_constraint_info (check_nonnull(NODE))->template_reqs
1431
1432 // Access the expression describing the trailing constraints. This is non-null
1433 // for any implicit instantiation of a constrained declaration. For a
1434 // templated declaration it is non-null only when a trailing requires-clause
1435 // was specified.
1436 #define CI_DECLARATOR_REQS(NODE) \
1437   check_constraint_info (check_nonnull(NODE))->declarator_reqs
1438
1439 // The computed associated constraint expression for a declaration.
1440 #define CI_ASSOCIATED_CONSTRAINTS(NODE) \
1441   check_constraint_info (check_nonnull(NODE))->associated_constr
1442
1443 // Access the logical constraints on the template parameters introduced
1444 // at a given template parameter list level indicated by NODE.
1445 #define TEMPLATE_PARMS_CONSTRAINTS(NODE) \
1446   TREE_TYPE (TREE_LIST_CHECK (NODE))
1447
1448 // Access the logical constraints on the template parameter declaration
1449 // indicated by NODE.
1450 #define TEMPLATE_PARM_CONSTRAINTS(NODE) \
1451   TREE_TYPE (TREE_LIST_CHECK (NODE))
1452
1453 /* Non-zero if the noexcept is present in a compound requirement. */
1454 #define COMPOUND_REQ_NOEXCEPT_P(NODE) \
1455   TREE_LANG_FLAG_0 (TREE_CHECK (NODE, COMPOUND_REQ))
1456
1457 /* The constraints on an 'auto' placeholder type, used in an argument deduction
1458    constraint.  */
1459 #define PLACEHOLDER_TYPE_CONSTRAINTS(NODE) \
1460   DECL_SIZE_UNIT (TYPE_NAME (NODE))
1461
1462 /* The expression evaluated by the predicate constraint. */
1463 #define PRED_CONSTR_EXPR(NODE) \
1464   TREE_OPERAND (TREE_CHECK (NODE, PRED_CONSTR), 0)
1465
1466 /* The concept of a concept check. */
1467 #define CHECK_CONSTR_CONCEPT(NODE) \
1468   TREE_OPERAND (TREE_CHECK (NODE, CHECK_CONSTR), 0)
1469
1470 /* The template arguments of a concept check. */
1471 #define CHECK_CONSTR_ARGS(NODE) \
1472   TREE_OPERAND (TREE_CHECK (NODE, CHECK_CONSTR), 1)
1473
1474 /* The expression validated by the predicate constraint. */
1475 #define EXPR_CONSTR_EXPR(NODE) \
1476   TREE_OPERAND (TREE_CHECK (NODE, EXPR_CONSTR), 0)
1477
1478 /* The type validated by the predicate constraint. */
1479 #define TYPE_CONSTR_TYPE(NODE) \
1480   TREE_OPERAND (TREE_CHECK (NODE, TYPE_CONSTR), 0)
1481
1482 /* In an implicit conversion constraint, the source expression. */
1483 #define ICONV_CONSTR_EXPR(NODE) \
1484   TREE_OPERAND (TREE_CHECK (NODE, ICONV_CONSTR), 0)
1485
1486 /* In an implicit conversion constraint, the target type. */
1487 #define ICONV_CONSTR_TYPE(NODE) \
1488   TREE_OPERAND (TREE_CHECK (NODE, ICONV_CONSTR), 1)
1489
1490 /* In an argument deduction constraint, the source expression. */
1491 #define DEDUCT_CONSTR_EXPR(NODE) \
1492   TREE_OPERAND (TREE_CHECK (NODE, DEDUCT_CONSTR), 0)
1493
1494 /* In an argument deduction constraint, the target type pattern. */
1495 #define DEDUCT_CONSTR_PATTERN(NODE) \
1496   TREE_OPERAND (TREE_CHECK (NODE, DEDUCT_CONSTR), 1)
1497
1498 /* In an argument deduction constraint, the list of placeholder nodes. */
1499 #define DEDUCT_CONSTR_PLACEHOLDER(NODE) \
1500   TREE_OPERAND (TREE_CHECK (NODE, DEDUCT_CONSTR), 2)
1501
1502 /* The expression of an exception constraint. */
1503 #define EXCEPT_CONSTR_EXPR(NODE) \
1504   TREE_OPERAND (TREE_CHECK (NODE, EXCEPT_CONSTR), 0)
1505
1506 /* In a parameterized constraint, the local parameters. */
1507 #define PARM_CONSTR_PARMS(NODE) \
1508   TREE_OPERAND (TREE_CHECK (NODE, PARM_CONSTR), 0)
1509
1510 /* In a parameterized constraint, the operand. */
1511 #define PARM_CONSTR_OPERAND(NODE) \
1512   TREE_OPERAND (TREE_CHECK (NODE, PARM_CONSTR), 1)
1513
1514 /* Whether a PARM_DECL represents a local parameter in a
1515    requires-expression.  */
1516 #define CONSTRAINT_VAR_P(NODE) \
1517   DECL_LANG_FLAG_2 (TREE_CHECK (NODE, PARM_DECL))
1518
1519 /* The concept constraining this constrained template-parameter.  */
1520 #define CONSTRAINED_PARM_CONCEPT(NODE) \
1521   DECL_SIZE_UNIT (TYPE_DECL_CHECK (NODE))
1522 /* Any extra template arguments specified for a constrained
1523    template-parameter.  */
1524 #define CONSTRAINED_PARM_EXTRA_ARGS(NODE) \
1525   DECL_SIZE (TYPE_DECL_CHECK (NODE))
1526 /* The first template parameter of CONSTRAINED_PARM_CONCEPT to be used as a
1527    prototype for the constrained parameter in finish_shorthand_constraint,
1528    attached for convenience.  */
1529 #define CONSTRAINED_PARM_PROTOTYPE(NODE) \
1530   DECL_INITIAL (TYPE_DECL_CHECK (NODE))
1531
1532 enum cp_tree_node_structure_enum {
1533   TS_CP_GENERIC,
1534   TS_CP_IDENTIFIER,
1535   TS_CP_TPI,
1536   TS_CP_PTRMEM,
1537   TS_CP_OVERLOAD,
1538   TS_CP_BASELINK,
1539   TS_CP_TEMPLATE_DECL,
1540   TS_CP_DEFAULT_ARG,
1541   TS_CP_DEFERRED_NOEXCEPT,
1542   TS_CP_STATIC_ASSERT,
1543   TS_CP_ARGUMENT_PACK_SELECT,
1544   TS_CP_TRAIT_EXPR,
1545   TS_CP_LAMBDA_EXPR,
1546   TS_CP_TEMPLATE_INFO,
1547   TS_CP_CONSTRAINT_INFO,
1548   TS_CP_USERDEF_LITERAL
1549 };
1550
1551 /* The resulting tree type.  */
1552 union GTY((desc ("cp_tree_node_structure (&%h)"),
1553        chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node {
1554   union tree_node GTY ((tag ("TS_CP_GENERIC"),
1555                         desc ("tree_node_structure (&%h)"))) generic;
1556   struct template_parm_index GTY ((tag ("TS_CP_TPI"))) tpi;
1557   struct ptrmem_cst GTY ((tag ("TS_CP_PTRMEM"))) ptrmem;
1558   struct tree_overload GTY ((tag ("TS_CP_OVERLOAD"))) overload;
1559   struct tree_baselink GTY ((tag ("TS_CP_BASELINK"))) baselink;
1560   struct tree_template_decl GTY ((tag ("TS_CP_TEMPLATE_DECL"))) template_decl;
1561   struct tree_default_arg GTY ((tag ("TS_CP_DEFAULT_ARG"))) default_arg;
1562   struct tree_deferred_noexcept GTY ((tag ("TS_CP_DEFERRED_NOEXCEPT"))) deferred_noexcept;
1563   struct lang_identifier GTY ((tag ("TS_CP_IDENTIFIER"))) identifier;
1564   struct tree_static_assert GTY ((tag ("TS_CP_STATIC_ASSERT")))
1565     static_assertion;
1566   struct tree_argument_pack_select GTY ((tag ("TS_CP_ARGUMENT_PACK_SELECT")))
1567     argument_pack_select;
1568   struct tree_trait_expr GTY ((tag ("TS_CP_TRAIT_EXPR")))
1569     trait_expression;
1570   struct tree_lambda_expr GTY ((tag ("TS_CP_LAMBDA_EXPR")))
1571     lambda_expression;
1572   struct tree_template_info GTY ((tag ("TS_CP_TEMPLATE_INFO")))
1573     template_info;
1574   struct tree_constraint_info GTY ((tag ("TS_CP_CONSTRAINT_INFO")))
1575     constraint_info;
1576   struct tree_userdef_literal GTY ((tag ("TS_CP_USERDEF_LITERAL")))
1577     userdef_literal;
1578 };
1579
1580 \f
1581 /* Global state.  */
1582
1583 struct GTY(()) saved_scope {
1584   vec<cxx_saved_binding, va_gc> *old_bindings;
1585   tree old_namespace;
1586   vec<tree, va_gc> *decl_ns_list;
1587   tree class_name;
1588   tree class_type;
1589   tree access_specifier;
1590   tree function_decl;
1591   vec<tree, va_gc> *lang_base;
1592   tree lang_name;
1593   tree template_parms;
1594   cp_binding_level *x_previous_class_level;
1595   tree x_saved_tree;
1596
1597   /* Only used for uses of this in trailing return type.  */
1598   tree x_current_class_ptr;
1599   tree x_current_class_ref;
1600
1601   int x_processing_template_decl;
1602   int x_processing_specialization;
1603   BOOL_BITFIELD x_processing_explicit_instantiation : 1;
1604   BOOL_BITFIELD need_pop_function_context : 1;
1605
1606 /* Nonzero if we are parsing the discarded statement of a constexpr
1607    if-statement.  */
1608   BOOL_BITFIELD discarded_stmt : 1;
1609
1610   int unevaluated_operand;
1611   int inhibit_evaluation_warnings;
1612   int noexcept_operand;
1613   /* If non-zero, implicit "omp declare target" attribute is added into the
1614      attribute lists.  */
1615   int omp_declare_target_attribute;
1616
1617   struct stmt_tree_s x_stmt_tree;
1618
1619   cp_binding_level *class_bindings;
1620   cp_binding_level *bindings;
1621
1622   hash_map<tree, tree> *GTY((skip)) x_local_specializations;
1623
1624   struct saved_scope *prev;
1625 };
1626
1627 extern GTY(()) struct saved_scope *scope_chain;
1628
1629 /* The current open namespace.  */
1630
1631 #define current_namespace scope_chain->old_namespace
1632
1633 /* The stack for namespaces of current declarations.  */
1634
1635 #define decl_namespace_list scope_chain->decl_ns_list
1636
1637 /* IDENTIFIER_NODE: name of current class */
1638
1639 #define current_class_name scope_chain->class_name
1640
1641 /* _TYPE: the type of the current class */
1642
1643 #define current_class_type scope_chain->class_type
1644
1645 /* When parsing a class definition, the access specifier most recently
1646    given by the user, or, if no access specifier was given, the
1647    default value appropriate for the kind of class (i.e., struct,
1648    class, or union).  */
1649
1650 #define current_access_specifier scope_chain->access_specifier
1651
1652 /* Pointer to the top of the language name stack.  */
1653
1654 #define current_lang_base scope_chain->lang_base
1655 #define current_lang_name scope_chain->lang_name
1656
1657 /* When parsing a template declaration, a TREE_LIST represents the
1658    active template parameters.  Each node in the list represents one
1659    level of template parameters.  The innermost level is first in the
1660    list.  The depth of each level is stored as an INTEGER_CST in the
1661    TREE_PURPOSE of each node.  The parameters for that level are
1662    stored in the TREE_VALUE.  */
1663
1664 #define current_template_parms scope_chain->template_parms
1665
1666 #define processing_template_decl scope_chain->x_processing_template_decl
1667 #define processing_specialization scope_chain->x_processing_specialization
1668 #define processing_explicit_instantiation scope_chain->x_processing_explicit_instantiation
1669
1670 #define in_discarded_stmt scope_chain->discarded_stmt
1671
1672 /* RAII sentinel to handle clearing processing_template_decl and restoring
1673    it when done.  */
1674
1675 struct processing_template_decl_sentinel
1676 {
1677   int saved;
1678   processing_template_decl_sentinel (bool reset = true)
1679     : saved (processing_template_decl)
1680   {
1681     if (reset)
1682       processing_template_decl = 0;
1683   }
1684   ~processing_template_decl_sentinel()
1685   {
1686     processing_template_decl = saved;
1687   }
1688 };
1689
1690 /* RAII sentinel to disable certain warnings during template substitution
1691    and elsewhere.  */
1692
1693 struct warning_sentinel
1694 {
1695   int &flag;
1696   int val;
1697   warning_sentinel(int& flag, bool suppress=true)
1698     : flag(flag), val(flag) { if (suppress) flag = 0; }
1699   ~warning_sentinel() { flag = val; }
1700 };
1701
1702 /* RAII sentinel that saves the value of a variable, optionally
1703    overrides it right away, and restores its value when the sentinel
1704    id destructed.  */
1705
1706 template <typename T>
1707 class temp_override
1708 {
1709   T& overridden_variable;
1710   T saved_value;
1711 public:
1712   temp_override(T& var) : overridden_variable (var), saved_value (var) {}
1713   temp_override(T& var, T overrider)
1714     : overridden_variable (var), saved_value (var)
1715   {
1716     overridden_variable = overrider;
1717   }
1718   ~temp_override() { overridden_variable = saved_value; }
1719 };
1720
1721 /* The cached class binding level, from the most recently exited
1722    class, or NULL if none.  */
1723
1724 #define previous_class_level scope_chain->x_previous_class_level
1725
1726 /* A map from local variable declarations in the body of the template
1727    presently being instantiated to the corresponding instantiated
1728    local variables.  */
1729
1730 #define local_specializations scope_chain->x_local_specializations
1731
1732 /* Nonzero if we are parsing the operand of a noexcept operator.  */
1733
1734 #define cp_noexcept_operand scope_chain->noexcept_operand
1735
1736 /* A list of private types mentioned, for deferred access checking.  */
1737
1738 struct GTY((for_user)) cxx_int_tree_map {
1739   unsigned int uid;
1740   tree to;
1741 };
1742
1743 struct cxx_int_tree_map_hasher : ggc_ptr_hash<cxx_int_tree_map>
1744 {
1745   static hashval_t hash (cxx_int_tree_map *);
1746   static bool equal (cxx_int_tree_map *, cxx_int_tree_map *);
1747 };
1748
1749 struct named_label_entry; /* Defined in decl.c.  */
1750
1751 struct named_label_hash : ggc_remove <named_label_entry *>
1752 {
1753   typedef named_label_entry *value_type;
1754   typedef tree compare_type; /* An identifier.  */
1755
1756   inline static hashval_t hash (value_type);
1757   inline static bool equal (const value_type, compare_type);
1758
1759   inline static void mark_empty (value_type &p) {p = NULL;}
1760   inline static bool is_empty (value_type p) {return !p;}
1761
1762   /* Nothing is deletable.  Everything is insertable.  */
1763   inline static bool is_deleted (value_type) { return false; }
1764   inline static void mark_deleted (value_type) { gcc_unreachable (); }
1765 };
1766
1767 /* Global state pertinent to the current function.  */
1768
1769 struct GTY(()) language_function {
1770   struct c_language_function base;
1771
1772   tree x_cdtor_label;
1773   tree x_current_class_ptr;
1774   tree x_current_class_ref;
1775   tree x_eh_spec_block;
1776   tree x_in_charge_parm;
1777   tree x_vtt_parm;
1778   tree x_return_value;
1779   tree x_auto_return_pattern;
1780
1781   BOOL_BITFIELD returns_value : 1;
1782   BOOL_BITFIELD returns_null : 1;
1783   BOOL_BITFIELD returns_abnormally : 1;
1784   BOOL_BITFIELD infinite_loop: 1;
1785   BOOL_BITFIELD x_in_function_try_handler : 1;
1786   BOOL_BITFIELD x_in_base_initializer : 1;
1787
1788   /* True if this function can throw an exception.  */
1789   BOOL_BITFIELD can_throw : 1;
1790
1791   BOOL_BITFIELD invalid_constexpr : 1;
1792
1793   hash_table<named_label_hash> *x_named_labels;
1794
1795   cp_binding_level *bindings;
1796
1797   /* Tracking possibly infinite loops.  This is a vec<tree> only because
1798      vec<bool> doesn't work with gtype.  */
1799   vec<tree, va_gc> *infinite_loops;
1800   hash_table<cxx_int_tree_map_hasher> *extern_decl_map;
1801 };
1802
1803 /* The current C++-specific per-function global variables.  */
1804
1805 #define cp_function_chain (cfun->language)
1806
1807 /* In a constructor destructor, the point at which all derived class
1808    destroying/construction has been done.  I.e., just before a
1809    constructor returns, or before any base class destroying will be done
1810    in a destructor.  */
1811
1812 #define cdtor_label cp_function_chain->x_cdtor_label
1813
1814 /* When we're processing a member function, current_class_ptr is the
1815    PARM_DECL for the `this' pointer.  The current_class_ref is an
1816    expression for `*this'.  */
1817
1818 #define current_class_ptr                       \
1819   (*(cfun && cp_function_chain                  \
1820      ? &cp_function_chain->x_current_class_ptr  \
1821      : &scope_chain->x_current_class_ptr))
1822 #define current_class_ref                       \
1823   (*(cfun && cp_function_chain                  \
1824      ? &cp_function_chain->x_current_class_ref  \
1825      : &scope_chain->x_current_class_ref))
1826
1827 /* The EH_SPEC_BLOCK for the exception-specifiers for the current
1828    function, if any.  */
1829
1830 #define current_eh_spec_block cp_function_chain->x_eh_spec_block
1831
1832 /* The `__in_chrg' parameter for the current function.  Only used for
1833    constructors and destructors.  */
1834
1835 #define current_in_charge_parm cp_function_chain->x_in_charge_parm
1836
1837 /* The `__vtt_parm' parameter for the current function.  Only used for
1838    constructors and destructors.  */
1839
1840 #define current_vtt_parm cp_function_chain->x_vtt_parm
1841
1842 /* Set to 0 at beginning of a function definition, set to 1 if
1843    a return statement that specifies a return value is seen.  */
1844
1845 #define current_function_returns_value cp_function_chain->returns_value
1846
1847 /* Set to 0 at beginning of a function definition, set to 1 if
1848    a return statement with no argument is seen.  */
1849
1850 #define current_function_returns_null cp_function_chain->returns_null
1851
1852 /* Set to 0 at beginning of a function definition, set to 1 if
1853    a call to a noreturn function is seen.  */
1854
1855 #define current_function_returns_abnormally \
1856   cp_function_chain->returns_abnormally
1857
1858 /* Set to 0 at beginning of a function definition, set to 1 if we see an
1859    obvious infinite loop.  This can have false positives and false
1860    negatives, so it should only be used as a heuristic.  */
1861
1862 #define current_function_infinite_loop cp_function_chain->infinite_loop
1863
1864 /* Nonzero if we are processing a base initializer.  Zero elsewhere.  */
1865 #define in_base_initializer cp_function_chain->x_in_base_initializer
1866
1867 #define in_function_try_handler cp_function_chain->x_in_function_try_handler
1868
1869 /* Expression always returned from function, or error_mark_node
1870    otherwise, for use by the automatic named return value optimization.  */
1871
1872 #define current_function_return_value \
1873   (cp_function_chain->x_return_value)
1874
1875 /* A type involving 'auto' to be used for return type deduction.  */
1876
1877 #define current_function_auto_return_pattern \
1878   (cp_function_chain->x_auto_return_pattern)
1879
1880 /* In parser.c.  */
1881 extern tree cp_literal_operator_id (const char *);
1882
1883 #define NON_ERROR(NODE) ((NODE) == error_mark_node ? NULL_TREE : (NODE))
1884
1885 /* TRUE if a tree code represents a statement.  */
1886 extern bool statement_code_p[MAX_TREE_CODES];
1887
1888 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
1889
1890 enum languages { lang_c, lang_cplusplus };
1891
1892 /* Macros to make error reporting functions' lives easier.  */
1893 #define TYPE_LINKAGE_IDENTIFIER(NODE) \
1894   (TYPE_IDENTIFIER (TYPE_MAIN_VARIANT (NODE)))
1895 #define TYPE_NAME_STRING(NODE) (IDENTIFIER_POINTER (TYPE_IDENTIFIER (NODE)))
1896 #define TYPE_NAME_LENGTH(NODE) (IDENTIFIER_LENGTH (TYPE_IDENTIFIER (NODE)))
1897
1898 /* Nonzero if NODE has no name for linkage purposes.  */
1899 #define TYPE_UNNAMED_P(NODE) \
1900   (OVERLOAD_TYPE_P (NODE) && anon_aggrname_p (TYPE_LINKAGE_IDENTIFIER (NODE)))
1901
1902 /* The _DECL for this _TYPE.  */
1903 #define TYPE_MAIN_DECL(NODE) (TYPE_STUB_DECL (TYPE_MAIN_VARIANT (NODE)))
1904
1905 /* Nonzero if T is a type that could resolve to any kind of concrete type
1906    at instantiation time.  */
1907 #define WILDCARD_TYPE_P(T)                              \
1908   (TREE_CODE (T) == TEMPLATE_TYPE_PARM                  \
1909    || TREE_CODE (T) == TYPENAME_TYPE                    \
1910    || TREE_CODE (T) == TYPEOF_TYPE                      \
1911    || TREE_CODE (T) == BOUND_TEMPLATE_TEMPLATE_PARM     \
1912    || TREE_CODE (T) == DECLTYPE_TYPE)
1913
1914 /* Nonzero if T is a class (or struct or union) type.  Also nonzero
1915    for template type parameters, typename types, and instantiated
1916    template template parameters.  Keep these checks in ascending code
1917    order.  */
1918 #define MAYBE_CLASS_TYPE_P(T) (WILDCARD_TYPE_P (T) || CLASS_TYPE_P (T))
1919
1920 /* Set CLASS_TYPE_P for T to VAL.  T must be a class, struct, or
1921    union type.  */
1922 #define SET_CLASS_TYPE_P(T, VAL) \
1923   (TYPE_LANG_FLAG_5 (RECORD_OR_UNION_CHECK (T)) = (VAL))
1924
1925 /* Nonzero if T is a class type.  Zero for template type parameters,
1926    typename types, and so forth.  */
1927 #define CLASS_TYPE_P(T) \
1928   (RECORD_OR_UNION_CODE_P (TREE_CODE (T)) && TYPE_LANG_FLAG_5 (T))
1929
1930 /* Nonzero if T is a class type but not an union.  */
1931 #define NON_UNION_CLASS_TYPE_P(T) \
1932   (TREE_CODE (T) == RECORD_TYPE && TYPE_LANG_FLAG_5 (T))
1933
1934 /* Keep these checks in ascending code order.  */
1935 #define RECORD_OR_UNION_CODE_P(T)       \
1936   ((T) == RECORD_TYPE || (T) == UNION_TYPE)
1937 #define OVERLOAD_TYPE_P(T) \
1938   (CLASS_TYPE_P (T) || TREE_CODE (T) == ENUMERAL_TYPE)
1939
1940 /* True if this type is dependent.  This predicate is only valid if
1941    TYPE_DEPENDENT_P_VALID is true.  */
1942 #define TYPE_DEPENDENT_P(NODE) TYPE_LANG_FLAG_0 (NODE)
1943
1944 /* True if dependent_type_p has been called for this type, with the
1945    result that TYPE_DEPENDENT_P is valid.  */
1946 #define TYPE_DEPENDENT_P_VALID(NODE) TYPE_LANG_FLAG_6(NODE)
1947
1948 /* Nonzero if this type is const-qualified.  */
1949 #define CP_TYPE_CONST_P(NODE)                           \
1950   ((cp_type_quals (NODE) & TYPE_QUAL_CONST) != 0)
1951
1952 /* Nonzero if this type is volatile-qualified.  */
1953 #define CP_TYPE_VOLATILE_P(NODE)                        \
1954   ((cp_type_quals (NODE) & TYPE_QUAL_VOLATILE) != 0)
1955
1956 /* Nonzero if this type is restrict-qualified.  */
1957 #define CP_TYPE_RESTRICT_P(NODE)                        \
1958   ((cp_type_quals (NODE) & TYPE_QUAL_RESTRICT) != 0)
1959
1960 /* Nonzero if this type is const-qualified, but not
1961    volatile-qualified.  Other qualifiers are ignored.  This macro is
1962    used to test whether or not it is OK to bind an rvalue to a
1963    reference.  */
1964 #define CP_TYPE_CONST_NON_VOLATILE_P(NODE)                              \
1965   ((cp_type_quals (NODE) & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE))      \
1966    == TYPE_QUAL_CONST)
1967
1968 #define FUNCTION_ARG_CHAIN(NODE) \
1969   TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (NODE)))
1970
1971 /* Given a FUNCTION_DECL, returns the first TREE_LIST out of TYPE_ARG_TYPES
1972    which refers to a user-written parameter.  */
1973 #define FUNCTION_FIRST_USER_PARMTYPE(NODE) \
1974   skip_artificial_parms_for ((NODE), TYPE_ARG_TYPES (TREE_TYPE (NODE)))
1975
1976 /* Similarly, but for DECL_ARGUMENTS.  */
1977 #define FUNCTION_FIRST_USER_PARM(NODE) \
1978   skip_artificial_parms_for ((NODE), DECL_ARGUMENTS (NODE))
1979
1980 /* Nonzero iff TYPE is derived from PARENT. Ignores accessibility and
1981    ambiguity issues.  */
1982 #define DERIVED_FROM_P(PARENT, TYPE) \
1983   (lookup_base ((TYPE), (PARENT), ba_any, NULL, tf_none) != NULL_TREE)
1984
1985 /* Gives the visibility specification for a class type.  */
1986 #define CLASSTYPE_VISIBILITY(TYPE)              \
1987         DECL_VISIBILITY (TYPE_MAIN_DECL (TYPE))
1988 #define CLASSTYPE_VISIBILITY_SPECIFIED(TYPE)    \
1989         DECL_VISIBILITY_SPECIFIED (TYPE_MAIN_DECL (TYPE))
1990
1991 struct GTY (()) tree_pair_s {
1992   tree purpose;
1993   tree value;
1994 };
1995 typedef tree_pair_s *tree_pair_p;
1996
1997 /* This structure provides additional information above and beyond
1998    what is provide in the ordinary tree_type.  In the past, we used it
1999    for the types of class types, template parameters types, typename
2000    types, and so forth.  However, there can be many (tens to hundreds
2001    of thousands) of template parameter types in a compilation, and
2002    there's no need for this additional information in that case.
2003    Therefore, we now use this data structure only for class types.
2004
2005    In the past, it was thought that there would be relatively few
2006    class types.  However, in the presence of heavy use of templates,
2007    many (i.e., thousands) of classes can easily be generated.
2008    Therefore, we should endeavor to keep the size of this structure to
2009    a minimum.  */
2010 struct GTY(()) lang_type {
2011   unsigned char align;
2012
2013   unsigned has_type_conversion : 1;
2014   unsigned has_copy_ctor : 1;
2015   unsigned has_default_ctor : 1;
2016   unsigned const_needs_init : 1;
2017   unsigned ref_needs_init : 1;
2018   unsigned has_const_copy_assign : 1;
2019   unsigned use_template : 2;
2020
2021   unsigned has_mutable : 1;
2022   unsigned com_interface : 1;
2023   unsigned non_pod_class : 1;
2024   unsigned nearly_empty_p : 1;
2025   unsigned user_align : 1;
2026   unsigned has_copy_assign : 1;
2027   unsigned has_new : 1;
2028   unsigned has_array_new : 1;
2029
2030   unsigned gets_delete : 2;
2031   unsigned interface_only : 1;
2032   unsigned interface_unknown : 1;
2033   unsigned contains_empty_class_p : 1;
2034   unsigned anon_aggr : 1;
2035   unsigned non_zero_init : 1;
2036   unsigned empty_p : 1;
2037   /* 32 bits allocated.  */
2038
2039   unsigned vec_new_uses_cookie : 1;
2040   unsigned declared_class : 1;
2041   unsigned diamond_shaped : 1;
2042   unsigned repeated_base : 1;
2043   unsigned being_defined : 1;
2044   unsigned debug_requested : 1;
2045   unsigned fields_readonly : 1;
2046   unsigned ptrmemfunc_flag : 1;
2047
2048   unsigned was_anonymous : 1;
2049   unsigned lazy_default_ctor : 1;
2050   unsigned lazy_copy_ctor : 1;
2051   unsigned lazy_copy_assign : 1;
2052   unsigned lazy_destructor : 1;
2053   unsigned has_const_copy_ctor : 1;
2054   unsigned has_complex_copy_ctor : 1;
2055   unsigned has_complex_copy_assign : 1;
2056
2057   unsigned non_aggregate : 1;
2058   unsigned has_complex_dflt : 1;
2059   unsigned has_list_ctor : 1;
2060   unsigned non_std_layout : 1;
2061   unsigned is_literal : 1;
2062   unsigned lazy_move_ctor : 1;
2063   unsigned lazy_move_assign : 1;
2064   unsigned has_complex_move_ctor : 1;
2065
2066   unsigned has_complex_move_assign : 1;
2067   unsigned has_constexpr_ctor : 1;
2068   unsigned unique_obj_representations : 1;
2069   unsigned unique_obj_representations_set : 1;
2070
2071   /* When adding a flag here, consider whether or not it ought to
2072      apply to a template instance if it applies to the template.  If
2073      so, make sure to copy it in instantiate_class_template!  */
2074
2075   /* There are some bits left to fill out a 32-bit word.  Keep track
2076      of this by updating the size of this bitfield whenever you add or
2077      remove a flag.  */
2078   unsigned dummy : 4;
2079
2080   tree primary_base;
2081   vec<tree_pair_s, va_gc> *vcall_indices;
2082   tree vtables;
2083   tree typeinfo_var;
2084   vec<tree, va_gc> *vbases;
2085   binding_table nested_udts;
2086   tree as_base;
2087   vec<tree, va_gc> *pure_virtuals;
2088   tree friend_classes;
2089   vec<tree, va_gc> * GTY((reorder ("resort_type_member_vec"))) members;
2090   tree key_method;
2091   tree decl_list;
2092   tree befriending_classes;
2093   /* In a RECORD_TYPE, information specific to Objective-C++, such
2094      as a list of adopted protocols or a pointer to a corresponding
2095      @interface.  See objc/objc-act.h for details.  */
2096   tree objc_info;
2097   /* FIXME reuse another field?  */
2098   tree lambda_expr;
2099 };
2100
2101 /* We used to have a variant type for lang_type.  Keep the name of the
2102    checking accessor for the sole survivor.  */
2103 #define LANG_TYPE_CLASS_CHECK(NODE) (TYPE_LANG_SPECIFIC (NODE))
2104
2105 /* Nonzero for _CLASSTYPE means that operator delete is defined.  */
2106 #define TYPE_GETS_DELETE(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->gets_delete)
2107 #define TYPE_GETS_REG_DELETE(NODE) (TYPE_GETS_DELETE (NODE) & 1)
2108
2109 /* Nonzero if `new NODE[x]' should cause the allocation of extra
2110    storage to indicate how many array elements are in use.  */
2111 #define TYPE_VEC_NEW_USES_COOKIE(NODE)                  \
2112   (CLASS_TYPE_P (NODE)                                  \
2113    && LANG_TYPE_CLASS_CHECK (NODE)->vec_new_uses_cookie)
2114
2115 /* Nonzero means that this _CLASSTYPE node defines ways of converting
2116    itself to other types.  */
2117 #define TYPE_HAS_CONVERSION(NODE) \
2118   (LANG_TYPE_CLASS_CHECK (NODE)->has_type_conversion)
2119
2120 /* Nonzero means that NODE (a class type) has a default constructor --
2121    but that it has not yet been declared.  */
2122 #define CLASSTYPE_LAZY_DEFAULT_CTOR(NODE) \
2123   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_default_ctor)
2124
2125 /* Nonzero means that NODE (a class type) has a copy constructor --
2126    but that it has not yet been declared.  */
2127 #define CLASSTYPE_LAZY_COPY_CTOR(NODE) \
2128   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_copy_ctor)
2129
2130 /* Nonzero means that NODE (a class type) has a move constructor --
2131    but that it has not yet been declared.  */
2132 #define CLASSTYPE_LAZY_MOVE_CTOR(NODE) \
2133   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_move_ctor)
2134
2135 /* Nonzero means that NODE (a class type) has an assignment operator
2136    -- but that it has not yet been declared.  */
2137 #define CLASSTYPE_LAZY_COPY_ASSIGN(NODE) \
2138   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_copy_assign)
2139
2140 /* Nonzero means that NODE (a class type) has an assignment operator
2141    -- but that it has not yet been declared.  */
2142 #define CLASSTYPE_LAZY_MOVE_ASSIGN(NODE) \
2143   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_move_assign)
2144
2145 /* Nonzero means that NODE (a class type) has a destructor -- but that
2146    it has not yet been declared.  */
2147 #define CLASSTYPE_LAZY_DESTRUCTOR(NODE) \
2148   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_destructor)
2149
2150 /* Nonzero means that NODE (a class type) is final */
2151 #define CLASSTYPE_FINAL(NODE) \
2152   TYPE_FINAL_P (NODE)
2153
2154
2155 /* Nonzero means that this _CLASSTYPE node overloads operator=(X&).  */
2156 #define TYPE_HAS_COPY_ASSIGN(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_copy_assign)
2157
2158 /* True iff the class type NODE has an "operator =" whose parameter
2159    has a parameter of type "const X&".  */
2160 #define TYPE_HAS_CONST_COPY_ASSIGN(NODE) \
2161   (LANG_TYPE_CLASS_CHECK (NODE)->has_const_copy_assign)
2162
2163 /* Nonzero means that this _CLASSTYPE node has an X(X&) constructor.  */
2164 #define TYPE_HAS_COPY_CTOR(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_copy_ctor)
2165 #define TYPE_HAS_CONST_COPY_CTOR(NODE) \
2166   (LANG_TYPE_CLASS_CHECK (NODE)->has_const_copy_ctor)
2167
2168 /* Nonzero if this class has an X(initializer_list<T>) constructor.  */
2169 #define TYPE_HAS_LIST_CTOR(NODE) \
2170   (LANG_TYPE_CLASS_CHECK (NODE)->has_list_ctor)
2171
2172 /* Nonzero if this class has a constexpr constructor other than a copy/move
2173    constructor.  Note that a class can have constexpr constructors for
2174    static initialization even if it isn't a literal class.  */
2175 #define TYPE_HAS_CONSTEXPR_CTOR(NODE) \
2176   (LANG_TYPE_CLASS_CHECK (NODE)->has_constexpr_ctor)
2177
2178 /* Nonzero if this class defines an overloaded operator new.  (An
2179    operator new [] doesn't count.)  */
2180 #define TYPE_HAS_NEW_OPERATOR(NODE) \
2181   (LANG_TYPE_CLASS_CHECK (NODE)->has_new)
2182
2183 /* Nonzero if this class defines an overloaded operator new[].  */
2184 #define TYPE_HAS_ARRAY_NEW_OPERATOR(NODE) \
2185   (LANG_TYPE_CLASS_CHECK (NODE)->has_array_new)
2186
2187 /* Nonzero means that this type is being defined.  I.e., the left brace
2188    starting the definition of this type has been seen.  */
2189 #define TYPE_BEING_DEFINED(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->being_defined)
2190
2191 /* Nonzero means that this type is either complete or being defined, so we
2192    can do lookup in it.  */
2193 #define COMPLETE_OR_OPEN_TYPE_P(NODE) \
2194   (COMPLETE_TYPE_P (NODE) || (CLASS_TYPE_P (NODE) && TYPE_BEING_DEFINED (NODE)))
2195
2196 /* Mark bits for repeated base checks.  */
2197 #define TYPE_MARKED_P(NODE) TREE_LANG_FLAG_6 (TYPE_CHECK (NODE))
2198
2199 /* Nonzero if the class NODE has multiple paths to the same (virtual)
2200    base object.  */
2201 #define CLASSTYPE_DIAMOND_SHAPED_P(NODE) \
2202   (LANG_TYPE_CLASS_CHECK(NODE)->diamond_shaped)
2203
2204 /* Nonzero if the class NODE has multiple instances of the same base
2205    type.  */
2206 #define CLASSTYPE_REPEATED_BASE_P(NODE) \
2207   (LANG_TYPE_CLASS_CHECK(NODE)->repeated_base)
2208
2209 /* The member function with which the vtable will be emitted:
2210    the first noninline non-pure-virtual member function.  NULL_TREE
2211    if there is no key function or if this is a class template */
2212 #define CLASSTYPE_KEY_METHOD(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->key_method)
2213
2214 /* Vector of members.  During definition, it is unordered and only
2215    member functions are present.  After completion it is sorted and
2216    contains both member functions and non-functions.  STAT_HACK is
2217    involved to preserve oneslot per name invariant.  */
2218 #define CLASSTYPE_MEMBER_VEC(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->members)
2219
2220 /* For class templates, this is a TREE_LIST of all member data,
2221    functions, types, and friends in the order of declaration.
2222    The TREE_PURPOSE of each TREE_LIST is NULL_TREE for a friend,
2223    and the RECORD_TYPE for the class template otherwise.  */
2224 #define CLASSTYPE_DECL_LIST(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->decl_list)
2225
2226 /* A FUNCTION_DECL or OVERLOAD for the constructors for NODE.  These
2227    are the constructors that take an in-charge parameter.  */
2228 #define CLASSTYPE_CONSTRUCTORS(NODE) \
2229   (get_class_binding_direct (NODE, ctor_identifier))
2230
2231 /* A FUNCTION_DECL for the destructor for NODE.  This is the
2232    destructors that take an in-charge parameter.  If
2233    CLASSTYPE_LAZY_DESTRUCTOR is true, then this entry will be NULL
2234    until the destructor is created with lazily_declare_fn.  */
2235 #define CLASSTYPE_DESTRUCTOR(NODE) \
2236   (get_class_binding_direct (NODE, dtor_identifier))
2237
2238 /* A dictionary of the nested user-defined-types (class-types, or enums)
2239    found within this class.  This table includes nested member class
2240    templates.  */
2241 #define CLASSTYPE_NESTED_UTDS(NODE) \
2242    (LANG_TYPE_CLASS_CHECK (NODE)->nested_udts)
2243
2244 /* Nonzero if NODE has a primary base class, i.e., a base class with
2245    which it shares the virtual function table pointer.  */
2246 #define CLASSTYPE_HAS_PRIMARY_BASE_P(NODE) \
2247   (CLASSTYPE_PRIMARY_BINFO (NODE) != NULL_TREE)
2248
2249 /* If non-NULL, this is the binfo for the primary base class, i.e.,
2250    the base class which contains the virtual function table pointer
2251    for this class.  */
2252 #define CLASSTYPE_PRIMARY_BINFO(NODE) \
2253   (LANG_TYPE_CLASS_CHECK (NODE)->primary_base)
2254
2255 /* A vector of BINFOs for the direct and indirect virtual base classes
2256    that this type uses in a post-order depth-first left-to-right
2257    order.  (In other words, these bases appear in the order that they
2258    should be initialized.)  */
2259 #define CLASSTYPE_VBASECLASSES(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->vbases)
2260
2261 /* The type corresponding to NODE when NODE is used as a base class,
2262    i.e., NODE without virtual base classes or tail padding.  */
2263 #define CLASSTYPE_AS_BASE(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->as_base)
2264
2265 /* True iff NODE is the CLASSTYPE_AS_BASE version of some type.  */
2266 #define IS_FAKE_BASE_TYPE(NODE)                                 \
2267   (TREE_CODE (NODE) == RECORD_TYPE                              \
2268    && TYPE_CONTEXT (NODE) && CLASS_TYPE_P (TYPE_CONTEXT (NODE)) \
2269    && CLASSTYPE_AS_BASE (TYPE_CONTEXT (NODE)) == (NODE))
2270
2271 /* These are the size and alignment of the type without its virtual
2272    base classes, for when we use this type as a base itself.  */
2273 #define CLASSTYPE_SIZE(NODE) TYPE_SIZE (CLASSTYPE_AS_BASE (NODE))
2274 #define CLASSTYPE_SIZE_UNIT(NODE) TYPE_SIZE_UNIT (CLASSTYPE_AS_BASE (NODE))
2275 #define CLASSTYPE_ALIGN(NODE) TYPE_ALIGN (CLASSTYPE_AS_BASE (NODE))
2276 #define CLASSTYPE_USER_ALIGN(NODE) TYPE_USER_ALIGN (CLASSTYPE_AS_BASE (NODE))
2277
2278 /* The alignment of NODE, without its virtual bases, in bytes.  */
2279 #define CLASSTYPE_ALIGN_UNIT(NODE) \
2280   (CLASSTYPE_ALIGN (NODE) / BITS_PER_UNIT)
2281
2282 /* A vec<tree> of virtual functions which cannot be inherited by
2283    derived classes.  When deriving from this type, the derived
2284    class must provide its own definition for each of these functions.  */
2285 #define CLASSTYPE_PURE_VIRTUALS(NODE) \
2286   (LANG_TYPE_CLASS_CHECK (NODE)->pure_virtuals)
2287
2288 /* Nonzero means that this type is an abstract class type.  */
2289 #define ABSTRACT_CLASS_TYPE_P(NODE) \
2290   (CLASS_TYPE_P (NODE) && CLASSTYPE_PURE_VIRTUALS(NODE))
2291
2292 /* Nonzero means that this type has an X() constructor.  */
2293 #define TYPE_HAS_DEFAULT_CONSTRUCTOR(NODE) \
2294   (LANG_TYPE_CLASS_CHECK (NODE)->has_default_ctor)
2295
2296 /* Nonzero means that this type contains a mutable member.  */
2297 #define CLASSTYPE_HAS_MUTABLE(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_mutable)
2298 #define TYPE_HAS_MUTABLE_P(NODE) (cp_has_mutable_p (NODE))
2299
2300 /* Nonzero means that this class type is not POD for the purpose of layout
2301    (as defined in the ABI).  This is different from the language's POD.  */
2302 #define CLASSTYPE_NON_LAYOUT_POD_P(NODE) \
2303   (LANG_TYPE_CLASS_CHECK (NODE)->non_pod_class)
2304
2305 /* Nonzero means that this class type is a non-standard-layout class.  */
2306 #define CLASSTYPE_NON_STD_LAYOUT(NODE) \
2307   (LANG_TYPE_CLASS_CHECK (NODE)->non_std_layout)
2308
2309 /* Nonzero means that this class type does have unique object
2310    representations.  */
2311 #define CLASSTYPE_UNIQUE_OBJ_REPRESENTATIONS(NODE) \
2312   (LANG_TYPE_CLASS_CHECK (NODE)->unique_obj_representations)
2313
2314 /* Nonzero means that this class type has
2315    CLASSTYPE_UNIQUE_OBJ_REPRESENTATIONS computed.  */
2316 #define CLASSTYPE_UNIQUE_OBJ_REPRESENTATIONS_SET(NODE) \
2317   (LANG_TYPE_CLASS_CHECK (NODE)->unique_obj_representations_set)
2318
2319 /* Nonzero means that this class contains pod types whose default
2320    initialization is not a zero initialization (namely, pointers to
2321    data members).  */
2322 #define CLASSTYPE_NON_ZERO_INIT_P(NODE) \
2323   (LANG_TYPE_CLASS_CHECK (NODE)->non_zero_init)
2324
2325 /* Nonzero if this class is "empty" in the sense of the C++ ABI.  */
2326 #define CLASSTYPE_EMPTY_P(NODE) \
2327   (LANG_TYPE_CLASS_CHECK (NODE)->empty_p)
2328
2329 /* Nonzero if this class is "nearly empty", i.e., contains only a
2330    virtual function table pointer.  */
2331 #define CLASSTYPE_NEARLY_EMPTY_P(NODE) \
2332   (LANG_TYPE_CLASS_CHECK (NODE)->nearly_empty_p)
2333
2334 /* Nonzero if this class contains an empty subobject.  */
2335 #define CLASSTYPE_CONTAINS_EMPTY_CLASS_P(NODE) \
2336   (LANG_TYPE_CLASS_CHECK (NODE)->contains_empty_class_p)
2337
2338 /* A list of class types of which this type is a friend.  The
2339    TREE_VALUE is normally a TYPE, but will be a TEMPLATE_DECL in the
2340    case of a template friend.  */
2341 #define CLASSTYPE_FRIEND_CLASSES(NODE) \
2342   (LANG_TYPE_CLASS_CHECK (NODE)->friend_classes)
2343
2344 /* A list of the classes which grant friendship to this class.  */
2345 #define CLASSTYPE_BEFRIENDING_CLASSES(NODE) \
2346   (LANG_TYPE_CLASS_CHECK (NODE)->befriending_classes)
2347
2348 /* The associated LAMBDA_EXPR that made this class.  */
2349 #define CLASSTYPE_LAMBDA_EXPR(NODE) \
2350   (LANG_TYPE_CLASS_CHECK (NODE)->lambda_expr)
2351 /* The extra mangling scope for this closure type.  */
2352 #define LAMBDA_TYPE_EXTRA_SCOPE(NODE) \
2353   (LAMBDA_EXPR_EXTRA_SCOPE (CLASSTYPE_LAMBDA_EXPR (NODE)))
2354
2355 /* Say whether this node was declared as a "class" or a "struct".  */
2356 #define CLASSTYPE_DECLARED_CLASS(NODE) \
2357   (LANG_TYPE_CLASS_CHECK (NODE)->declared_class)
2358
2359 /* Nonzero if this class has const members
2360    which have no specified initialization.  */
2361 #define CLASSTYPE_READONLY_FIELDS_NEED_INIT(NODE)       \
2362   (TYPE_LANG_SPECIFIC (NODE)                            \
2363    ? LANG_TYPE_CLASS_CHECK (NODE)->const_needs_init : 0)
2364 #define SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT(NODE, VALUE) \
2365   (LANG_TYPE_CLASS_CHECK (NODE)->const_needs_init = (VALUE))
2366
2367 /* Nonzero if this class has ref members
2368    which have no specified initialization.  */
2369 #define CLASSTYPE_REF_FIELDS_NEED_INIT(NODE)            \
2370   (TYPE_LANG_SPECIFIC (NODE)                            \
2371    ? LANG_TYPE_CLASS_CHECK (NODE)->ref_needs_init : 0)
2372 #define SET_CLASSTYPE_REF_FIELDS_NEED_INIT(NODE, VALUE) \
2373   (LANG_TYPE_CLASS_CHECK (NODE)->ref_needs_init = (VALUE))
2374
2375 /* Nonzero if this class is included from a header file which employs
2376    `#pragma interface', and it is not included in its implementation file.  */
2377 #define CLASSTYPE_INTERFACE_ONLY(NODE) \
2378   (LANG_TYPE_CLASS_CHECK (NODE)->interface_only)
2379
2380 /* True if we have already determined whether or not vtables, VTTs,
2381    typeinfo, and other similar per-class data should be emitted in
2382    this translation unit.  This flag does not indicate whether or not
2383    these items should be emitted; it only indicates that we know one
2384    way or the other.  */
2385 #define CLASSTYPE_INTERFACE_KNOWN(NODE) \
2386   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown == 0)
2387 /* The opposite of CLASSTYPE_INTERFACE_KNOWN.  */
2388 #define CLASSTYPE_INTERFACE_UNKNOWN(NODE) \
2389   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown)
2390
2391 #define SET_CLASSTYPE_INTERFACE_UNKNOWN_X(NODE,X) \
2392   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown = !!(X))
2393 #define SET_CLASSTYPE_INTERFACE_UNKNOWN(NODE) \
2394   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown = 1)
2395 #define SET_CLASSTYPE_INTERFACE_KNOWN(NODE) \
2396   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown = 0)
2397
2398 /* Nonzero if a _DECL node requires us to output debug info for this class.  */
2399 #define CLASSTYPE_DEBUG_REQUESTED(NODE) \
2400   (LANG_TYPE_CLASS_CHECK (NODE)->debug_requested)
2401 \f
2402 /* Additional macros for inheritance information.  */
2403
2404 /* Nonzero means that this class is on a path leading to a new vtable.  */
2405 #define BINFO_VTABLE_PATH_MARKED(NODE) BINFO_FLAG_1 (NODE)
2406
2407 /* Nonzero means B (a BINFO) has its own vtable.  Any copies will not
2408    have this flag set.  */
2409 #define BINFO_NEW_VTABLE_MARKED(B) (BINFO_FLAG_2 (B))
2410
2411 /* Compare a BINFO_TYPE with another type for equality.  For a binfo,
2412    this is functionally equivalent to using same_type_p, but
2413    measurably faster.  At least one of the arguments must be a
2414    BINFO_TYPE.  The other can be a BINFO_TYPE or a regular type.  If
2415    BINFO_TYPE(T) ever stops being the main variant of the class the
2416    binfo is for, this macro must change.  */
2417 #define SAME_BINFO_TYPE_P(A, B) ((A) == (B))
2418
2419 /* Any subobject that needs a new vtable must have a vptr and must not
2420    be a non-virtual primary base (since it would then use the vtable from a
2421    derived class and never become non-primary.)  */
2422 #define SET_BINFO_NEW_VTABLE_MARKED(B)                                   \
2423   (BINFO_NEW_VTABLE_MARKED (B) = 1,                                      \
2424    gcc_assert (!BINFO_PRIMARY_P (B) || BINFO_VIRTUAL_P (B)),             \
2425    gcc_assert (TYPE_VFIELD (BINFO_TYPE (B))))
2426
2427 /* Nonzero if this binfo is for a dependent base - one that should not
2428    be searched.  */
2429 #define BINFO_DEPENDENT_BASE_P(NODE) BINFO_FLAG_3 (NODE)
2430
2431 /* Nonzero if this binfo has lost its primary base binfo (because that
2432    is a nearly-empty virtual base that has been taken by some other
2433    base in the complete hierarchy.  */
2434 #define BINFO_LOST_PRIMARY_P(NODE) BINFO_FLAG_4 (NODE)
2435
2436 /* Nonzero if this BINFO is a primary base class.  */
2437 #define BINFO_PRIMARY_P(NODE) BINFO_FLAG_5(NODE)
2438 \f
2439 /* A vec<tree_pair_s> of the vcall indices associated with the class
2440    NODE.  The PURPOSE of each element is a FUNCTION_DECL for a virtual
2441    function.  The VALUE is the index into the virtual table where the
2442    vcall offset for that function is stored, when NODE is a virtual
2443    base.  */
2444 #define CLASSTYPE_VCALL_INDICES(NODE) \
2445   (LANG_TYPE_CLASS_CHECK (NODE)->vcall_indices)
2446
2447 /* The various vtables for the class NODE.  The primary vtable will be
2448    first, followed by the construction vtables and VTT, if any.  */
2449 #define CLASSTYPE_VTABLES(NODE) \
2450   (LANG_TYPE_CLASS_CHECK (NODE)->vtables)
2451
2452 /* The std::type_info variable representing this class, or NULL if no
2453    such variable has been created.  This field is only set for the
2454    TYPE_MAIN_VARIANT of the class.  */
2455 #define CLASSTYPE_TYPEINFO_VAR(NODE) \
2456   (LANG_TYPE_CLASS_CHECK (NODE)->typeinfo_var)
2457
2458 /* Accessor macros for the BINFO_VIRTUALS list.  */
2459
2460 /* The number of bytes by which to adjust the `this' pointer when
2461    calling this virtual function.  Subtract this value from the this
2462    pointer. Always non-NULL, might be constant zero though.  */
2463 #define BV_DELTA(NODE) (TREE_PURPOSE (NODE))
2464
2465 /* If non-NULL, the vtable index at which to find the vcall offset
2466    when calling this virtual function.  Add the value at that vtable
2467    index to the this pointer.  */
2468 #define BV_VCALL_INDEX(NODE) (TREE_TYPE (NODE))
2469
2470 /* The function to call.  */
2471 #define BV_FN(NODE) (TREE_VALUE (NODE))
2472
2473 /* Whether or not this entry is for a lost primary virtual base.  */
2474 #define BV_LOST_PRIMARY(NODE) (TREE_LANG_FLAG_0 (NODE))
2475 \f
2476 /* For FUNCTION_TYPE or METHOD_TYPE, a list of the exceptions that
2477    this type can raise.  Each TREE_VALUE is a _TYPE.  The TREE_VALUE
2478    will be NULL_TREE to indicate a throw specification of `()', or
2479    no exceptions allowed.  For a noexcept specification, TREE_VALUE
2480    is NULL_TREE and TREE_PURPOSE is the constant-expression.  For
2481    a deferred noexcept-specification, TREE_PURPOSE is a DEFERRED_NOEXCEPT
2482    (for templates) or an OVERLOAD list of functions (for implicitly
2483    declared functions).  */
2484 #define TYPE_RAISES_EXCEPTIONS(NODE) \
2485   TYPE_LANG_SLOT_1 (FUNC_OR_METHOD_CHECK (NODE))
2486
2487 /* For FUNCTION_TYPE or METHOD_TYPE, return 1 iff it is declared `throw()'
2488    or noexcept(true).  */
2489 #define TYPE_NOTHROW_P(NODE) nothrow_spec_p (TYPE_RAISES_EXCEPTIONS (NODE))
2490
2491 /* For FUNCTION_TYPE or METHOD_TYPE, true if NODE is noexcept.  This is the
2492    case for things declared noexcept(true) and, with -fnothrow-opt, for
2493    throw() functions.  */
2494 #define TYPE_NOEXCEPT_P(NODE) type_noexcept_p (NODE)
2495
2496 /* The binding level associated with the namespace.  */
2497 #define NAMESPACE_LEVEL(NODE) \
2498   (LANG_DECL_NS_CHECK (NODE)->level)
2499 \f
2500 /* Discriminator values for lang_decl.  */
2501
2502 enum lang_decl_selector
2503 {
2504   lds_min,
2505   lds_fn,
2506   lds_ns,
2507   lds_parm,
2508   lds_decomp
2509 };
2510
2511 /* Flags shared by all forms of DECL_LANG_SPECIFIC.
2512
2513    Some of the flags live here only to make lang_decl_min/fn smaller.  Do
2514    not make this struct larger than 32 bits; instead, make sel smaller.  */
2515
2516 struct GTY(()) lang_decl_base {
2517   /* Larger than necessary for faster access.  */
2518   ENUM_BITFIELD(lang_decl_selector) selector : 16;
2519   ENUM_BITFIELD(languages) language : 1;
2520   unsigned use_template : 2;
2521   unsigned not_really_extern : 1;          /* var or fn */
2522   unsigned initialized_in_class : 1;       /* var or fn */
2523   unsigned repo_available_p : 1;           /* var or fn */
2524   unsigned threadprivate_or_deleted_p : 1; /* var or fn */
2525   unsigned anticipated_p : 1;              /* fn, type or template */
2526   /* anticipated_p reused as DECL_OMP_PRIVATIZED_MEMBER in var */
2527   unsigned friend_or_tls : 1;              /* var, fn, type or template */
2528   unsigned unknown_bound_p : 1;            /* var */
2529   unsigned odr_used : 1;                   /* var or fn */
2530   unsigned spare : 1;
2531   unsigned concept_p : 1;                  /* applies to vars and functions */
2532   unsigned var_declared_inline_p : 1;      /* var */
2533   unsigned dependent_init_p : 1;           /* var */
2534   /* 1 spare bit */
2535 };
2536
2537 /* True for DECL codes which have template info and access.  */
2538 #define LANG_DECL_HAS_MIN(NODE)                 \
2539   (VAR_OR_FUNCTION_DECL_P (NODE)                \
2540    || TREE_CODE (NODE) == FIELD_DECL            \
2541    || TREE_CODE (NODE) == CONST_DECL            \
2542    || TREE_CODE (NODE) == TYPE_DECL             \
2543    || TREE_CODE (NODE) == TEMPLATE_DECL         \
2544    || TREE_CODE (NODE) == USING_DECL)
2545
2546 /* DECL_LANG_SPECIFIC for the above codes.  */
2547
2548 struct GTY(()) lang_decl_min {
2549   struct lang_decl_base base;
2550
2551   /* In a FUNCTION_DECL for which DECL_THUNK_P holds, this is
2552      THUNK_ALIAS.
2553      In a FUNCTION_DECL for which DECL_THUNK_P does not hold,
2554      VAR_DECL, TYPE_DECL, or TEMPLATE_DECL, this is
2555      DECL_TEMPLATE_INFO.  */
2556   tree template_info;
2557
2558   /* In a DECL_THUNK_P FUNCTION_DECL, this is THUNK_VIRTUAL_OFFSET.
2559      In a lambda-capture proxy VAR_DECL, this is DECL_CAPTURED_VARIABLE.
2560      In a function-scope TREE_STATIC VAR_DECL or IMPLICIT_TYPEDEF_P TYPE_DECL,
2561      this is DECL_DISCRIMINATOR.
2562      Otherwise, in a class-scope DECL, this is DECL_ACCESS.   */
2563   tree access;
2564 };
2565
2566 /* Additional DECL_LANG_SPECIFIC information for functions.  */
2567
2568 struct GTY(()) lang_decl_fn {
2569   struct lang_decl_min min;
2570
2571   /* In a overloaded operator, this is the compressed operator code.  */
2572   unsigned ovl_op_code : 6;
2573   unsigned global_ctor_p : 1;
2574   unsigned global_dtor_p : 1;
2575
2576   unsigned static_function : 1;
2577   unsigned pure_virtual : 1;
2578   unsigned defaulted_p : 1;
2579   unsigned has_in_charge_parm_p : 1;
2580   unsigned has_vtt_parm_p : 1;
2581   unsigned pending_inline_p : 1;
2582   unsigned nonconverting : 1;
2583   unsigned thunk_p : 1;
2584
2585   unsigned this_thunk_p : 1;
2586   unsigned hidden_friend_p : 1;
2587   unsigned omp_declare_reduction_p : 1;
2588   unsigned has_dependent_explicit_spec_p : 1;
2589   unsigned spare : 12;
2590
2591   /* 32-bits padding on 64-bit host.  */
2592
2593   /* For a non-thunk function decl, this is a tree list of
2594      friendly classes. For a thunk function decl, it is the
2595      thunked to function decl.  */
2596   tree befriending_classes;
2597
2598   /* For a non-virtual FUNCTION_DECL, this is
2599      DECL_FRIEND_CONTEXT.  For a virtual FUNCTION_DECL for which
2600      DECL_THIS_THUNK_P does not hold, this is DECL_THUNKS. Both
2601      this pointer and result pointer adjusting thunks are
2602      chained here.  This pointer thunks to return pointer thunks
2603      will be chained on the return pointer thunk.  */
2604   tree context;
2605
2606   union lang_decl_u5
2607   {
2608     /* In a non-thunk FUNCTION_DECL or TEMPLATE_DECL, this is
2609        DECL_CLONED_FUNCTION.  */
2610     tree GTY ((tag ("0"))) cloned_function;
2611
2612     /* In a FUNCTION_DECL for which THUNK_P holds this is the
2613        THUNK_FIXED_OFFSET.  */
2614     HOST_WIDE_INT GTY ((tag ("1"))) fixed_offset;
2615   } GTY ((desc ("%1.thunk_p"))) u5;
2616
2617   union lang_decl_u3
2618   {
2619     struct cp_token_cache * GTY ((tag ("1"))) pending_inline_info;
2620     struct language_function * GTY ((tag ("0")))
2621       saved_language_function;
2622   } GTY ((desc ("%1.pending_inline_p"))) u;
2623
2624 };
2625
2626 /* DECL_LANG_SPECIFIC for namespaces.  */
2627
2628 struct GTY(()) lang_decl_ns {
2629   struct lang_decl_base base;
2630   cp_binding_level *level;
2631
2632   /* using directives and inline children.  These need to be va_gc,
2633      because of PCH.  */
2634   vec<tree, va_gc> *usings;
2635   vec<tree, va_gc> *inlinees;
2636
2637   /* Hash table of bound decls. It'd be nice to have this inline, but
2638      as the hash_map has a dtor, we can't then put this struct into a
2639      union (until moving to c++11).  */
2640   hash_table<named_decl_hash> *bindings;
2641 };
2642
2643 /* DECL_LANG_SPECIFIC for parameters.  */
2644
2645 struct GTY(()) lang_decl_parm {
2646   struct lang_decl_base base;
2647   int level;
2648   int index;
2649 };
2650
2651 /* Additional DECL_LANG_SPECIFIC information for structured bindings.  */
2652
2653 struct GTY(()) lang_decl_decomp {
2654   struct lang_decl_min min;
2655   /* The artificial underlying "e" variable of the structured binding
2656      variable.  */
2657   tree base;
2658 };
2659
2660 /* DECL_LANG_SPECIFIC for all types.  It would be nice to just make this a
2661    union rather than a struct containing a union as its only field, but
2662    tree.h declares it as a struct.  */
2663
2664 struct GTY(()) lang_decl {
2665   union GTY((desc ("%h.base.selector"))) lang_decl_u {
2666      /* Nothing of only the base type exists.  */
2667     struct lang_decl_base GTY ((default)) base;
2668     struct lang_decl_min GTY((tag ("lds_min"))) min;
2669     struct lang_decl_fn GTY ((tag ("lds_fn"))) fn;
2670     struct lang_decl_ns GTY((tag ("lds_ns"))) ns;
2671     struct lang_decl_parm GTY((tag ("lds_parm"))) parm;
2672     struct lang_decl_decomp GTY((tag ("lds_decomp"))) decomp;
2673   } u;
2674 };
2675
2676 /* Looks through a template (if present) to find what it declares.  */
2677 #define STRIP_TEMPLATE(NODE) \
2678   (TREE_CODE (NODE) == TEMPLATE_DECL ? DECL_TEMPLATE_RESULT (NODE) : NODE)
2679
2680 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
2681
2682 #define LANG_DECL_MIN_CHECK(NODE) __extension__                 \
2683 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);            \
2684    if (!LANG_DECL_HAS_MIN (NODE))                               \
2685      lang_check_failed (__FILE__, __LINE__, __FUNCTION__);      \
2686    &lt->u.min; })
2687
2688 /* We want to be able to check DECL_CONSTRUCTOR_P and such on a function
2689    template, not just on a FUNCTION_DECL.  So when looking for things in
2690    lang_decl_fn, look down through a TEMPLATE_DECL into its result.  */
2691 #define LANG_DECL_FN_CHECK(NODE) __extension__                          \
2692 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (STRIP_TEMPLATE (NODE));   \
2693    if (!DECL_DECLARES_FUNCTION_P (NODE)                                 \
2694        || lt->u.base.selector != lds_fn)                                \
2695      lang_check_failed (__FILE__, __LINE__, __FUNCTION__);              \
2696    &lt->u.fn; })
2697
2698 #define LANG_DECL_NS_CHECK(NODE) __extension__                          \
2699 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);                    \
2700    if (TREE_CODE (NODE) != NAMESPACE_DECL                               \
2701        || lt->u.base.selector != lds_ns)                                \
2702      lang_check_failed (__FILE__, __LINE__, __FUNCTION__);              \
2703    &lt->u.ns; })
2704
2705 #define LANG_DECL_PARM_CHECK(NODE) __extension__                \
2706 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);            \
2707   if (TREE_CODE (NODE) != PARM_DECL                             \
2708       || lt->u.base.selector != lds_parm)                       \
2709     lang_check_failed (__FILE__, __LINE__, __FUNCTION__);       \
2710   &lt->u.parm; })
2711
2712 #define LANG_DECL_DECOMP_CHECK(NODE) __extension__              \
2713 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);            \
2714   if (!VAR_P (NODE)                                             \
2715       || lt->u.base.selector != lds_decomp)                     \
2716     lang_check_failed (__FILE__, __LINE__, __FUNCTION__);       \
2717   &lt->u.decomp; })
2718
2719 #else
2720
2721 #define LANG_DECL_MIN_CHECK(NODE) \
2722   (&DECL_LANG_SPECIFIC (NODE)->u.min)
2723
2724 #define LANG_DECL_FN_CHECK(NODE) \
2725   (&DECL_LANG_SPECIFIC (STRIP_TEMPLATE (NODE))->u.fn)
2726
2727 #define LANG_DECL_NS_CHECK(NODE) \
2728   (&DECL_LANG_SPECIFIC (NODE)->u.ns)
2729
2730 #define LANG_DECL_PARM_CHECK(NODE) \
2731   (&DECL_LANG_SPECIFIC (NODE)->u.parm)
2732
2733 #define LANG_DECL_DECOMP_CHECK(NODE) \
2734   (&DECL_LANG_SPECIFIC (NODE)->u.decomp)
2735
2736 #endif /* ENABLE_TREE_CHECKING */
2737
2738 /* For a FUNCTION_DECL or a VAR_DECL, the language linkage for the
2739    declaration.  Some entities (like a member function in a local
2740    class, or a local variable) do not have linkage at all, and this
2741    macro should not be used in those cases.
2742
2743    Implementation note: A FUNCTION_DECL without DECL_LANG_SPECIFIC was
2744    created by language-independent code, and has C linkage.  Most
2745    VAR_DECLs have C++ linkage, and do not have DECL_LANG_SPECIFIC, but
2746    we do create DECL_LANG_SPECIFIC for variables with non-C++ linkage.  */
2747 #define DECL_LANGUAGE(NODE)                             \
2748   (DECL_LANG_SPECIFIC (NODE)                            \
2749    ? DECL_LANG_SPECIFIC (NODE)->u.base.language         \
2750    : (TREE_CODE (NODE) == FUNCTION_DECL                 \
2751       ? lang_c : lang_cplusplus))
2752
2753 /* Set the language linkage for NODE to LANGUAGE.  */
2754 #define SET_DECL_LANGUAGE(NODE, LANGUAGE) \
2755   (DECL_LANG_SPECIFIC (NODE)->u.base.language = (LANGUAGE))
2756
2757 /* For FUNCTION_DECLs and TEMPLATE_DECLs: nonzero means that this function
2758    is a constructor.  */
2759 #define DECL_CONSTRUCTOR_P(NODE) \
2760   DECL_CXX_CONSTRUCTOR_P (STRIP_TEMPLATE (NODE))
2761
2762 /* Nonzero if NODE (a FUNCTION_DECL) is a constructor for a complete
2763    object.  */
2764 #define DECL_COMPLETE_CONSTRUCTOR_P(NODE)               \
2765   (DECL_NAME (NODE) == complete_ctor_identifier)
2766
2767 /* Nonzero if NODE (a FUNCTION_DECL) is a constructor for a base
2768    object.  */
2769 #define DECL_BASE_CONSTRUCTOR_P(NODE)           \
2770   (DECL_NAME (NODE) == base_ctor_identifier)
2771
2772 /* Nonzero if NODE (a FUNCTION_DECL) is a constructor, but not either the
2773    specialized in-charge constructor or the specialized not-in-charge
2774    constructor.  */
2775 #define DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P(NODE)                \
2776   (DECL_NAME (NODE) == ctor_identifier)
2777
2778 /* Nonzero if NODE (a FUNCTION_DECL) is a copy constructor.  */
2779 #define DECL_COPY_CONSTRUCTOR_P(NODE) \
2780   (DECL_CONSTRUCTOR_P (NODE) && copy_fn_p (NODE) > 0)
2781
2782 /* Nonzero if NODE (a FUNCTION_DECL) is a move constructor.  */
2783 #define DECL_MOVE_CONSTRUCTOR_P(NODE) \
2784   (DECL_CONSTRUCTOR_P (NODE) && move_fn_p (NODE))
2785
2786 /* Nonzero if NODE (a FUNCTION_DECL or TEMPLATE_DECL)
2787    is a destructor.  */
2788 #define DECL_DESTRUCTOR_P(NODE)                         \
2789   DECL_CXX_DESTRUCTOR_P (STRIP_TEMPLATE (NODE))
2790
2791 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor, but not the
2792    specialized in-charge constructor, in-charge deleting constructor,
2793    or the base destructor.  */
2794 #define DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P(NODE)                 \
2795   (DECL_NAME (NODE) == dtor_identifier)
2796
2797 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor for a complete
2798    object.  */
2799 #define DECL_COMPLETE_DESTRUCTOR_P(NODE)                \
2800   (DECL_NAME (NODE) == complete_dtor_identifier)
2801
2802 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor for a base
2803    object.  */
2804 #define DECL_BASE_DESTRUCTOR_P(NODE)            \
2805   (DECL_NAME (NODE) == base_dtor_identifier)
2806
2807 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor for a complete
2808    object that deletes the object after it has been destroyed.  */
2809 #define DECL_DELETING_DESTRUCTOR_P(NODE)                \
2810   (DECL_NAME (NODE) == deleting_dtor_identifier)
2811
2812 /* Nonzero if either DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P or
2813    DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P is true of NODE.  */
2814 #define DECL_MAYBE_IN_CHARGE_CDTOR_P(NODE)              \
2815   (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (NODE)            \
2816    || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (NODE))
2817
2818 /* Nonzero if NODE (a FUNCTION_DECL) is a cloned constructor or
2819    destructor.  */
2820 #define DECL_CLONED_FUNCTION_P(NODE) (!!decl_cloned_function_p (NODE, true))
2821
2822 /* If DECL_CLONED_FUNCTION_P holds, this is the function that was
2823    cloned.  */
2824 #define DECL_CLONED_FUNCTION(NODE) (*decl_cloned_function_p (NODE, false))
2825
2826 /* Perform an action for each clone of FN, if FN is a function with
2827    clones.  This macro should be used like:
2828
2829       FOR_EACH_CLONE (clone, fn)
2830         { ... }
2831
2832   */
2833 #define FOR_EACH_CLONE(CLONE, FN)                       \
2834   if (!(TREE_CODE (FN) == FUNCTION_DECL                 \
2835         && DECL_MAYBE_IN_CHARGE_CDTOR_P (FN)))          \
2836     ;                                                   \
2837   else                                                  \
2838     for (CLONE = DECL_CHAIN (FN);                       \
2839          CLONE && DECL_CLONED_FUNCTION_P (CLONE);       \
2840          CLONE = DECL_CHAIN (CLONE))
2841
2842 /* Nonzero if NODE has DECL_DISCRIMINATOR and not DECL_ACCESS.  */
2843 #define DECL_DISCRIMINATOR_P(NODE)                              \
2844   (((TREE_CODE (NODE) == VAR_DECL && TREE_STATIC (NODE))        \
2845     || DECL_IMPLICIT_TYPEDEF_P (NODE))                          \
2846    && DECL_FUNCTION_SCOPE_P (NODE))
2847
2848 /* Discriminator for name mangling.  */
2849 #define DECL_DISCRIMINATOR(NODE) (LANG_DECL_MIN_CHECK (NODE)->access)
2850
2851 /* The index of a user-declared parameter in its function, starting at 1.
2852    All artificial parameters will have index 0.  */
2853 #define DECL_PARM_INDEX(NODE) \
2854   (LANG_DECL_PARM_CHECK (NODE)->index)
2855
2856 /* The level of a user-declared parameter in its function, starting at 1.
2857    A parameter of the function will have level 1; a parameter of the first
2858    nested function declarator (i.e. t in void f (void (*p)(T t))) will have
2859    level 2.  */
2860 #define DECL_PARM_LEVEL(NODE) \
2861   (LANG_DECL_PARM_CHECK (NODE)->level)
2862
2863 /* Nonzero if the VTT parm has been added to NODE.  */
2864 #define DECL_HAS_VTT_PARM_P(NODE) \
2865   (LANG_DECL_FN_CHECK (NODE)->has_vtt_parm_p)
2866
2867 /* Nonzero if NODE is a FUNCTION_DECL for which a VTT parameter is
2868    required.  */
2869 #define DECL_NEEDS_VTT_PARM_P(NODE)                     \
2870   (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (NODE))         \
2871    && (DECL_BASE_CONSTRUCTOR_P (NODE)                   \
2872        || DECL_BASE_DESTRUCTOR_P (NODE)))
2873
2874 /* Nonzero if NODE is a user-defined conversion operator.  */
2875 #define DECL_CONV_FN_P(NODE) IDENTIFIER_CONV_OP_P (DECL_NAME (NODE))
2876
2877 /* The type to which conversion operator FN converts to.   */
2878 #define DECL_CONV_FN_TYPE(FN) \
2879   TREE_TYPE ((gcc_checking_assert (DECL_CONV_FN_P (FN)), DECL_NAME (FN)))
2880
2881 /* Nonzero if NODE, a static data member, was declared in its class as an
2882    array of unknown bound.  */
2883 #define VAR_HAD_UNKNOWN_BOUND(NODE)                     \
2884   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))           \
2885    ? DECL_LANG_SPECIFIC (NODE)->u.base.unknown_bound_p  \
2886    : false)
2887 #define SET_VAR_HAD_UNKNOWN_BOUND(NODE) \
2888   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.unknown_bound_p = true)
2889
2890 /* True iff decl NODE is for an overloaded operator.  */
2891 #define DECL_OVERLOADED_OPERATOR_P(NODE)                \
2892   IDENTIFIER_ANY_OP_P (DECL_NAME (NODE))
2893
2894 /* Nonzero if NODE is an assignment operator (including += and such).  */
2895 #define DECL_ASSIGNMENT_OPERATOR_P(NODE)                 \
2896   IDENTIFIER_ASSIGN_OP_P (DECL_NAME (NODE))
2897
2898 /* NODE is a function_decl for an overloaded operator.  Return its
2899    compressed (raw) operator code.  Note that this is not a TREE_CODE.  */
2900 #define DECL_OVERLOADED_OPERATOR_CODE_RAW(NODE)         \
2901   (LANG_DECL_FN_CHECK (NODE)->ovl_op_code)
2902
2903 /* DECL is an overloaded operator.  Test whether it is for TREE_CODE
2904    (a literal constant).  */
2905 #define DECL_OVERLOADED_OPERATOR_IS(DECL, CODE)                 \
2906   (DECL_OVERLOADED_OPERATOR_CODE_RAW (DECL) == OVL_OP_##CODE)
2907
2908 /* For FUNCTION_DECLs: nonzero means that this function is a
2909    constructor or a destructor with an extra in-charge parameter to
2910    control whether or not virtual bases are constructed.  */
2911 #define DECL_HAS_IN_CHARGE_PARM_P(NODE) \
2912   (LANG_DECL_FN_CHECK (NODE)->has_in_charge_parm_p)
2913
2914 /* Nonzero if DECL is a declaration of __builtin_constant_p.  */
2915 #define DECL_IS_BUILTIN_CONSTANT_P(NODE)                \
2916  (TREE_CODE (NODE) == FUNCTION_DECL                     \
2917   && DECL_BUILT_IN_CLASS (NODE) == BUILT_IN_NORMAL      \
2918   && DECL_FUNCTION_CODE (NODE) == BUILT_IN_CONSTANT_P)
2919
2920 /* Nonzero for _DECL means that this decl appears in (or will appear
2921    in) as a member in a RECORD_TYPE or UNION_TYPE node.  It is also for
2922    detecting circularity in case members are multiply defined.  In the
2923    case of a VAR_DECL, it is also used to determine how program storage
2924    should be allocated.  */
2925 #define DECL_IN_AGGR_P(NODE) (DECL_LANG_FLAG_3 (NODE))
2926
2927 /* Nonzero for a VAR_DECL means that the variable's initialization (if
2928    any) has been processed.  (In general, DECL_INITIALIZED_P is
2929    !DECL_EXTERNAL, but static data members may be initialized even if
2930    not defined.)  */
2931 #define DECL_INITIALIZED_P(NODE) \
2932    (TREE_LANG_FLAG_1 (VAR_DECL_CHECK (NODE)))
2933
2934 /* Nonzero for a VAR_DECL iff an explicit initializer was provided
2935    or a non-trivial constructor is called.  */
2936 #define DECL_NONTRIVIALLY_INITIALIZED_P(NODE)   \
2937    (TREE_LANG_FLAG_3 (VAR_DECL_CHECK (NODE)))
2938
2939 /* Nonzero for a VAR_DECL that was initialized with a
2940    constant-expression.  */
2941 #define DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P(NODE) \
2942   (TREE_LANG_FLAG_2 (VAR_DECL_CHECK (NODE)))
2943
2944 /* Nonzero if the DECL was initialized in the class definition itself,
2945    rather than outside the class.  This is used for both static member
2946    VAR_DECLS, and FUNCTION_DECLS that are defined in the class.  */
2947 #define DECL_INITIALIZED_IN_CLASS_P(DECL) \
2948   (DECL_LANG_SPECIFIC (VAR_OR_FUNCTION_DECL_CHECK (DECL)) \
2949    ->u.base.initialized_in_class)
2950
2951 /* Nonzero if the DECL is used in the sense of 3.2 [basic.def.odr].
2952    Only available for decls with DECL_LANG_SPECIFIC.  */
2953 #define DECL_ODR_USED(DECL) \
2954   (DECL_LANG_SPECIFIC (VAR_OR_FUNCTION_DECL_CHECK (DECL)) \
2955    ->u.base.odr_used)
2956
2957 /* Nonzero for DECL means that this decl is just a friend declaration,
2958    and should not be added to the list of members for this class.  */
2959 #define DECL_FRIEND_P(NODE) \
2960   (DECL_LANG_SPECIFIC (TYPE_FUNCTION_OR_TEMPLATE_DECL_CHECK (NODE)) \
2961    ->u.base.friend_or_tls)
2962
2963 /* Nonzero if the thread-local variable was declared with __thread as
2964    opposed to thread_local.  */
2965 #define DECL_GNU_TLS_P(NODE)                            \
2966   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))           \
2967    && DECL_LANG_SPECIFIC (NODE)->u.base.friend_or_tls)
2968 #define SET_DECL_GNU_TLS_P(NODE)                                \
2969   (retrofit_lang_decl (VAR_DECL_CHECK (NODE)),                  \
2970    DECL_LANG_SPECIFIC (NODE)->u.base.friend_or_tls = true)
2971
2972 /* A TREE_LIST of the types which have befriended this FUNCTION_DECL.  */
2973 #define DECL_BEFRIENDING_CLASSES(NODE) \
2974   (LANG_DECL_FN_CHECK (NODE)->befriending_classes)
2975
2976 /* Nonzero for FUNCTION_DECL means that this decl is a static
2977    member function.  */
2978 #define DECL_STATIC_FUNCTION_P(NODE) \
2979   (LANG_DECL_FN_CHECK (NODE)->static_function)
2980
2981 /* Nonzero for FUNCTION_DECL means that this decl is a non-static
2982    member function.  */
2983 #define DECL_NONSTATIC_MEMBER_FUNCTION_P(NODE) \
2984   (TREE_CODE (TREE_TYPE (NODE)) == METHOD_TYPE)
2985
2986 /* Nonzero for FUNCTION_DECL means that this decl is a member function
2987    (static or non-static).  */
2988 #define DECL_FUNCTION_MEMBER_P(NODE) \
2989   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE) || DECL_STATIC_FUNCTION_P (NODE))
2990
2991 /* Nonzero for FUNCTION_DECL means that this member function
2992    has `this' as const X *const.  */
2993 #define DECL_CONST_MEMFUNC_P(NODE)                                       \
2994   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE)                               \
2995    && CP_TYPE_CONST_P (TREE_TYPE (TREE_VALUE                             \
2996                                   (TYPE_ARG_TYPES (TREE_TYPE (NODE))))))
2997
2998 /* Nonzero for FUNCTION_DECL means that this member function
2999    has `this' as volatile X *const.  */
3000 #define DECL_VOLATILE_MEMFUNC_P(NODE)                                    \
3001   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE)                               \
3002    && CP_TYPE_VOLATILE_P (TREE_TYPE (TREE_VALUE                          \
3003                                   (TYPE_ARG_TYPES (TREE_TYPE (NODE))))))
3004
3005 /* Nonzero for a DECL means that this member is a non-static member.  */
3006 #define DECL_NONSTATIC_MEMBER_P(NODE)           \
3007   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE)      \
3008    || TREE_CODE (NODE) == FIELD_DECL)
3009
3010 /* Nonzero for _DECL means that this member object type
3011    is mutable.  */
3012 #define DECL_MUTABLE_P(NODE) (DECL_LANG_FLAG_0 (NODE))
3013
3014 /* Nonzero for _DECL means that this constructor or conversion function is
3015    non-converting.  */
3016 #define DECL_NONCONVERTING_P(NODE) \
3017   (LANG_DECL_FN_CHECK (NODE)->nonconverting)
3018
3019 /* Nonzero for FUNCTION_DECL means that this member function is a pure
3020    virtual function.  */
3021 #define DECL_PURE_VIRTUAL_P(NODE) \
3022   (LANG_DECL_FN_CHECK (NODE)->pure_virtual)
3023
3024 /* Nonzero for FUNCTION_DECL means that this member function (either
3025    a constructor or a conversion function) has an explicit specifier
3026    with a value-dependent expression.  */
3027 #define DECL_HAS_DEPENDENT_EXPLICIT_SPEC_P(NODE) \
3028   (LANG_DECL_FN_CHECK (NODE)->has_dependent_explicit_spec_p)
3029
3030 /* True (in a FUNCTION_DECL) if NODE is a virtual function that is an
3031    invalid overrider for a function from a base class.  Once we have
3032    complained about an invalid overrider we avoid complaining about it
3033    again.  */
3034 #define DECL_INVALID_OVERRIDER_P(NODE) \
3035   (DECL_LANG_FLAG_4 (NODE))
3036
3037 /* True (in a FUNCTION_DECL) if NODE is a function declared with
3038    an override virt-specifier */
3039 #define DECL_OVERRIDE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
3040
3041 /* The thunks associated with NODE, a FUNCTION_DECL.  */
3042 #define DECL_THUNKS(NODE) \
3043   (DECL_VIRTUAL_P (NODE) ? LANG_DECL_FN_CHECK (NODE)->context : NULL_TREE)
3044
3045 /* Set DECL_THUNKS.  */
3046 #define SET_DECL_THUNKS(NODE,THUNKS) \
3047   (LANG_DECL_FN_CHECK (NODE)->context = (THUNKS))
3048
3049 /* If NODE, a FUNCTION_DECL, is a C++11 inheriting constructor, then this
3050    is the constructor it inherits from.  */
3051 #define DECL_INHERITED_CTOR(NODE) \
3052   (DECL_DECLARES_FUNCTION_P (NODE) && DECL_CONSTRUCTOR_P (NODE) \
3053    ? LANG_DECL_FN_CHECK (NODE)->context : NULL_TREE)
3054
3055 /* And this is the base that constructor comes from.  */
3056 #define DECL_INHERITED_CTOR_BASE(NODE)                  \
3057   (DECL_INHERITED_CTOR (NODE)                           \
3058    ? DECL_CONTEXT (flag_new_inheriting_ctors            \
3059                    ? strip_inheriting_ctors (NODE)      \
3060                    : DECL_INHERITED_CTOR (NODE))        \
3061    : NULL_TREE)
3062
3063 /* Set the inherited base.  */
3064 #define SET_DECL_INHERITED_CTOR(NODE,INH) \
3065   (LANG_DECL_FN_CHECK (NODE)->context = (INH))
3066
3067 /* Nonzero if NODE is a thunk, rather than an ordinary function.  */
3068 #define DECL_THUNK_P(NODE)                      \
3069   (TREE_CODE (NODE) == FUNCTION_DECL            \
3070    && DECL_LANG_SPECIFIC (NODE)                 \
3071    && LANG_DECL_FN_CHECK (NODE)->thunk_p)
3072
3073 /* Set DECL_THUNK_P for node.  */
3074 #define SET_DECL_THUNK_P(NODE, THIS_ADJUSTING)                  \
3075   (LANG_DECL_FN_CHECK (NODE)->thunk_p = 1,                      \
3076    LANG_DECL_FN_CHECK (NODE)->this_thunk_p = (THIS_ADJUSTING))
3077
3078 /* Nonzero if NODE is a this pointer adjusting thunk.  */
3079 #define DECL_THIS_THUNK_P(NODE)                 \
3080   (DECL_THUNK_P (NODE) && LANG_DECL_FN_CHECK (NODE)->this_thunk_p)
3081
3082 /* Nonzero if NODE is a result pointer adjusting thunk.  */
3083 #define DECL_RESULT_THUNK_P(NODE)                       \
3084   (DECL_THUNK_P (NODE) && !LANG_DECL_FN_CHECK (NODE)->this_thunk_p)
3085
3086 /* Nonzero if NODE is a FUNCTION_DECL, but not a thunk.  */
3087 #define DECL_NON_THUNK_FUNCTION_P(NODE)                         \
3088   (TREE_CODE (NODE) == FUNCTION_DECL && !DECL_THUNK_P (NODE))
3089
3090 /* Nonzero if NODE is `extern "C"'.  */
3091 #define DECL_EXTERN_C_P(NODE) \
3092   (DECL_LANGUAGE (NODE) == lang_c)
3093
3094 /* Nonzero if NODE is an `extern "C"' function.  */
3095 #define DECL_EXTERN_C_FUNCTION_P(NODE) \
3096   (DECL_NON_THUNK_FUNCTION_P (NODE) && DECL_EXTERN_C_P (NODE))
3097
3098 /* True iff DECL is an entity with vague linkage whose definition is
3099    available in this translation unit.  */
3100 #define DECL_REPO_AVAILABLE_P(NODE) \
3101   (DECL_LANG_SPECIFIC (NODE)->u.base.repo_available_p)
3102
3103 /* True if DECL is declared 'constexpr'.  */
3104 #define DECL_DECLARED_CONSTEXPR_P(DECL) \
3105   DECL_LANG_FLAG_8 (VAR_OR_FUNCTION_DECL_CHECK (STRIP_TEMPLATE (DECL)))
3106
3107 // True if NODE was declared as 'concept'.  The flag implies that the
3108 // declaration is constexpr, that the declaration cannot be specialized or
3109 // refined, and that the result type must be convertible to bool.
3110 #define DECL_DECLARED_CONCEPT_P(NODE) \
3111   (DECL_LANG_SPECIFIC (NODE)->u.base.concept_p)
3112
3113 /* Nonzero if this DECL is the __PRETTY_FUNCTION__ variable in a
3114    template function.  */
3115 #define DECL_PRETTY_FUNCTION_P(NODE) \
3116   (DECL_NAME (NODE) \
3117    && id_equal (DECL_NAME (NODE), "__PRETTY_FUNCTION__"))
3118
3119 /* For a DECL, true if it is __func__ or similar.  */
3120 #define DECL_FNAME_P(NODE)                                      \
3121   (VAR_P (NODE) && DECL_NAME (NODE) && DECL_ARTIFICIAL (NODE)   \
3122    && DECL_HAS_VALUE_EXPR_P (NODE)                              \
3123    && (id_equal (DECL_NAME (NODE), "__PRETTY_FUNCTION__")       \
3124        || id_equal (DECL_NAME (NODE), "__FUNCTION__")           \
3125        || id_equal (DECL_NAME (NODE), "__func__")))
3126
3127 /* Nonzero if the variable was declared to be thread-local.
3128    We need a special C++ version of this test because the middle-end
3129    DECL_THREAD_LOCAL_P uses the symtab, so we can't use it for
3130    templates.  */
3131 #define CP_DECL_THREAD_LOCAL_P(NODE) \
3132   (TREE_LANG_FLAG_0 (VAR_DECL_CHECK (NODE)))
3133
3134 /* The _TYPE context in which this _DECL appears.  This field holds the
3135    class where a virtual function instance is actually defined.  */
3136 #define DECL_CLASS_CONTEXT(NODE) \
3137   (DECL_CLASS_SCOPE_P (NODE) ? DECL_CONTEXT (NODE) : NULL_TREE)
3138
3139 /* For a non-member friend function, the class (if any) in which this
3140    friend was defined.  For example, given:
3141
3142      struct S { friend void f () { ... } };
3143
3144    the DECL_FRIEND_CONTEXT for `f' will be `S'.  */
3145 #define DECL_FRIEND_CONTEXT(NODE)                               \
3146   ((DECL_DECLARES_FUNCTION_P (NODE)                             \
3147     && DECL_FRIEND_P (NODE) && !DECL_FUNCTION_MEMBER_P (NODE))  \
3148    ? LANG_DECL_FN_CHECK (NODE)->context                         \
3149    : NULL_TREE)
3150
3151 /* Set the DECL_FRIEND_CONTEXT for NODE to CONTEXT.  */
3152 #define SET_DECL_FRIEND_CONTEXT(NODE, CONTEXT) \
3153   (LANG_DECL_FN_CHECK (NODE)->context = (CONTEXT))
3154
3155 #define CP_DECL_CONTEXT(NODE) \
3156   (!DECL_FILE_SCOPE_P (NODE) ? DECL_CONTEXT (NODE) : global_namespace)
3157 #define CP_TYPE_CONTEXT(NODE) \
3158   (!TYPE_FILE_SCOPE_P (NODE) ? TYPE_CONTEXT (NODE) : global_namespace)
3159 #define FROB_CONTEXT(NODE) \
3160   ((NODE) == global_namespace ? DECL_CONTEXT (NODE) : (NODE))
3161
3162 /* 1 iff NODE has namespace scope, including the global namespace.  */
3163 #define DECL_NAMESPACE_SCOPE_P(NODE)                            \
3164   (!DECL_TEMPLATE_PARM_P (NODE)                                 \
3165    && TREE_CODE (CP_DECL_CONTEXT (NODE)) == NAMESPACE_DECL)
3166
3167 #define TYPE_NAMESPACE_SCOPE_P(NODE) \
3168   (TREE_CODE (CP_TYPE_CONTEXT (NODE)) == NAMESPACE_DECL)
3169
3170 #define NAMESPACE_SCOPE_P(NODE) \
3171   ((DECL_P (NODE) && DECL_NAMESPACE_SCOPE_P (NODE)) \
3172    || (TYPE_P (NODE) && TYPE_NAMESPACE_SCOPE_P (NODE)))
3173
3174 /* 1 iff NODE is a class member.  */
3175 #define DECL_CLASS_SCOPE_P(NODE) \
3176   (DECL_CONTEXT (NODE) && TYPE_P (DECL_CONTEXT (NODE)))
3177
3178 #define TYPE_CLASS_SCOPE_P(NODE) \
3179   (TYPE_CONTEXT (NODE) && TYPE_P (TYPE_CONTEXT (NODE)))
3180
3181 /* 1 iff NODE is function-local.  */
3182 #define DECL_FUNCTION_SCOPE_P(NODE) \
3183   (DECL_CONTEXT (NODE) \
3184    && TREE_CODE (DECL_CONTEXT (NODE)) == FUNCTION_DECL)
3185
3186 #define TYPE_FUNCTION_SCOPE_P(NODE) \
3187   (TYPE_CONTEXT (NODE) && TREE_CODE (TYPE_CONTEXT (NODE)) == FUNCTION_DECL)
3188
3189 /* 1 iff VAR_DECL node NODE is a type-info decl.  This flag is set for
3190    both the primary typeinfo object and the associated NTBS name.  */
3191 #define DECL_TINFO_P(NODE) TREE_LANG_FLAG_4 (VAR_DECL_CHECK (NODE))
3192
3193 /* 1 iff VAR_DECL node NODE is virtual table or VTT.  */
3194 #define DECL_VTABLE_OR_VTT_P(NODE) TREE_LANG_FLAG_5 (VAR_DECL_CHECK (NODE))
3195
3196 /* 1 iff FUNCTION_TYPE or METHOD_TYPE has a ref-qualifier (either & or &&). */
3197 #define FUNCTION_REF_QUALIFIED(NODE) \
3198   TREE_LANG_FLAG_4 (FUNC_OR_METHOD_CHECK (NODE))
3199
3200 /* 1 iff FUNCTION_TYPE or METHOD_TYPE has &&-ref-qualifier.  */
3201 #define FUNCTION_RVALUE_QUALIFIED(NODE) \
3202   TREE_LANG_FLAG_5 (FUNC_OR_METHOD_CHECK (NODE))
3203
3204 /* Returns 1 iff VAR_DECL is a construction virtual table.
3205    DECL_VTABLE_OR_VTT_P will be true in this case and must be checked
3206    before using this macro.  */
3207 #define DECL_CONSTRUCTION_VTABLE_P(NODE) \
3208   TREE_LANG_FLAG_6 (VAR_DECL_CHECK (NODE))
3209
3210 /* 1 iff NODE is function-local, but for types.  */
3211 #define LOCAL_CLASS_P(NODE)                             \
3212   (decl_function_context (TYPE_MAIN_DECL (NODE)) != NULL_TREE)
3213
3214 /* The nesting depth of namespace, class or function.  Makes is_ancestor much
3215    simpler.  Only 8 bits available.  */
3216 #define SCOPE_DEPTH(NODE) \
3217   (NAMESPACE_DECL_CHECK (NODE)->base.u.bits.address_space)
3218
3219 /* Whether the namepace is an inline namespace.  */
3220 #define DECL_NAMESPACE_INLINE_P(NODE) \
3221   TREE_LANG_FLAG_0 (NAMESPACE_DECL_CHECK (NODE))
3222
3223 /* In a NAMESPACE_DECL, a vector of using directives.  */
3224 #define DECL_NAMESPACE_USING(NODE) \
3225    (LANG_DECL_NS_CHECK (NODE)->usings)
3226
3227 /* In a NAMESPACE_DECL, a vector of inline namespaces.  */
3228 #define DECL_NAMESPACE_INLINEES(NODE) \
3229    (LANG_DECL_NS_CHECK (NODE)->inlinees)
3230
3231 /* Pointer to hash_map from IDENTIFIERS to DECLS  */
3232 #define DECL_NAMESPACE_BINDINGS(NODE) \
3233    (LANG_DECL_NS_CHECK (NODE)->bindings)
3234
3235 /* In a NAMESPACE_DECL, points to the original namespace if this is
3236    a namespace alias.  */
3237 #define DECL_NAMESPACE_ALIAS(NODE) \
3238         DECL_ABSTRACT_ORIGIN (NAMESPACE_DECL_CHECK (NODE))
3239 #define ORIGINAL_NAMESPACE(NODE)  \
3240   (DECL_NAMESPACE_ALIAS (NODE) ? DECL_NAMESPACE_ALIAS (NODE) : (NODE))
3241
3242 /* Nonzero if NODE is the std namespace.  */
3243 #define DECL_NAMESPACE_STD_P(NODE)                      \
3244   (TREE_CODE (NODE) == NAMESPACE_DECL                   \
3245    && CP_DECL_CONTEXT (NODE) == global_namespace        \
3246    && DECL_NAME (NODE) == std_identifier)
3247
3248 /* In a TREE_LIST in an attribute list, indicates that the attribute
3249    must be applied at instantiation time.  */
3250 #define ATTR_IS_DEPENDENT(NODE) TREE_LANG_FLAG_0 (TREE_LIST_CHECK (NODE))
3251
3252 /* In a TREE_LIST in the argument of attribute abi_tag, indicates that the tag
3253    was inherited from a template parameter, not explicitly indicated.  */
3254 #define ABI_TAG_IMPLICIT(NODE) TREE_LANG_FLAG_0 (TREE_LIST_CHECK (NODE))
3255
3256 /* Non zero if this is a using decl for a dependent scope. */
3257 #define DECL_DEPENDENT_P(NODE) DECL_LANG_FLAG_0 (USING_DECL_CHECK (NODE))
3258
3259 /* The scope named in a using decl.  */
3260 #define USING_DECL_SCOPE(NODE) TREE_TYPE (USING_DECL_CHECK (NODE))
3261
3262 /* The decls named by a using decl.  */
3263 #define USING_DECL_DECLS(NODE) DECL_INITIAL (USING_DECL_CHECK (NODE))
3264
3265 /* Non zero if the using decl refers to a dependent type.  */
3266 #define USING_DECL_TYPENAME_P(NODE) DECL_LANG_FLAG_1 (USING_DECL_CHECK (NODE))
3267
3268 /* In a FUNCTION_DECL, this is nonzero if this function was defined in
3269    the class definition.  We have saved away the text of the function,
3270    but have not yet processed it.  */
3271 #define DECL_PENDING_INLINE_P(NODE) \
3272   (LANG_DECL_FN_CHECK (NODE)->pending_inline_p)
3273
3274 /* If DECL_PENDING_INLINE_P holds, this is the saved text of the
3275    function.  */
3276 #define DECL_PENDING_INLINE_INFO(NODE) \
3277   (LANG_DECL_FN_CHECK (NODE)->u.pending_inline_info)
3278
3279 /* Nonzero for TYPE_DECL means that it was written 'using name = type'.  */
3280 #define TYPE_DECL_ALIAS_P(NODE) \
3281   DECL_LANG_FLAG_6 (TYPE_DECL_CHECK (NODE))
3282
3283 /* Nonzero for TEMPLATE_DECL means that it is a 'complex' alias template.  */
3284 #define TEMPLATE_DECL_COMPLEX_ALIAS_P(NODE) \
3285   DECL_LANG_FLAG_2 (TEMPLATE_DECL_CHECK (NODE))
3286
3287 /* Nonzero for a type which is an alias for another type; i.e, a type
3288    which declaration was written 'using name-of-type =
3289    another-type'.  */
3290 #define TYPE_ALIAS_P(NODE)                      \
3291   (TYPE_P (NODE)                                \
3292    && TYPE_NAME (NODE)                          \
3293    && TREE_CODE (TYPE_NAME (NODE)) == TYPE_DECL \
3294    && TYPE_DECL_ALIAS_P (TYPE_NAME (NODE)))
3295
3296 /* If non-NULL for a VAR_DECL, FUNCTION_DECL, TYPE_DECL or
3297    TEMPLATE_DECL, the entity is either a template specialization (if
3298    DECL_USE_TEMPLATE is nonzero) or the abstract instance of the
3299    template itself.
3300
3301    In either case, DECL_TEMPLATE_INFO is a TEMPLATE_INFO, whose
3302    TI_TEMPLATE is the TEMPLATE_DECL of which this entity is a
3303    specialization or abstract instance.  The TI_ARGS is the
3304    template arguments used to specialize the template.
3305
3306    Consider:
3307
3308       template <typename T> struct S { friend void f(T) {} };
3309
3310    In this case, S<int>::f is, from the point of view of the compiler,
3311    an instantiation of a template -- but, from the point of view of
3312    the language, each instantiation of S results in a wholly unrelated
3313    global function f.  In this case, DECL_TEMPLATE_INFO for S<int>::f
3314    will be non-NULL, but DECL_USE_TEMPLATE will be zero.  */
3315 #define DECL_TEMPLATE_INFO(NODE) \
3316   (DECL_LANG_SPECIFIC (VAR_TEMPL_TYPE_FIELD_OR_FUNCTION_DECL_CHECK (NODE)) \
3317    ->u.min.template_info)
3318
3319 /* For a lambda capture proxy, its captured variable.  */
3320 #define DECL_CAPTURED_VARIABLE(NODE) \
3321   (LANG_DECL_MIN_CHECK (NODE)->access)
3322
3323 /* For a VAR_DECL, indicates that the variable is actually a
3324    non-static data member of anonymous union that has been promoted to
3325    variable status.  */
3326 #define DECL_ANON_UNION_VAR_P(NODE) \
3327   (DECL_LANG_FLAG_4 (VAR_DECL_CHECK (NODE)))
3328
3329 /* Template information for a RECORD_TYPE or UNION_TYPE.  */
3330 #define CLASSTYPE_TEMPLATE_INFO(NODE) \
3331   (TYPE_LANG_SLOT_1 (RECORD_OR_UNION_CHECK (NODE)))
3332
3333 /* Template information for a template template parameter.  */
3334 #define TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO(NODE) \
3335   (TYPE_LANG_SLOT_1 (BOUND_TEMPLATE_TEMPLATE_PARM_TYPE_CHECK (NODE)))
3336
3337 /* Template information for an ENUMERAL_, RECORD_, UNION_TYPE, or
3338    BOUND_TEMPLATE_TEMPLATE_PARM type.  This ignores any alias
3339    templateness of NODE.  It'd be nice if this could unconditionally
3340    access the slot, rather than return NULL if given a
3341    non-templatable type.  */
3342 #define TYPE_TEMPLATE_INFO(NODE)                                        \
3343   (TREE_CODE (NODE) == ENUMERAL_TYPE                                    \
3344    || TREE_CODE (NODE) == BOUND_TEMPLATE_TEMPLATE_PARM                  \
3345    || RECORD_OR_UNION_TYPE_P (NODE)                                     \
3346    ? TYPE_LANG_SLOT_1 (NODE) : NULL_TREE)
3347
3348 /* Template information (if any) for an alias type.  */
3349 #define TYPE_ALIAS_TEMPLATE_INFO(NODE)                                  \
3350   (DECL_LANG_SPECIFIC (TYPE_NAME (NODE))                                \
3351    ? DECL_TEMPLATE_INFO (TYPE_NAME (NODE))                              \
3352    : NULL_TREE)
3353
3354 /* If NODE is a type alias, this accessor returns the template info
3355    for the alias template (if any).  Otherwise behave as
3356    TYPE_TEMPLATE_INFO.  */
3357 #define TYPE_TEMPLATE_INFO_MAYBE_ALIAS(NODE)                            \
3358   (TYPE_ALIAS_P (NODE)                                                  \
3359    ? TYPE_ALIAS_TEMPLATE_INFO (NODE)                                    \
3360    : TYPE_TEMPLATE_INFO (NODE))
3361
3362 /* Set the template information for an ENUMERAL_, RECORD_, or
3363    UNION_TYPE to VAL.  */
3364 #define SET_TYPE_TEMPLATE_INFO(NODE, VAL)                               \
3365   (TREE_CODE (NODE) == ENUMERAL_TYPE                                    \
3366    || (CLASS_TYPE_P (NODE) && !TYPE_ALIAS_P (NODE))                     \
3367    ? (TYPE_LANG_SLOT_1 (NODE) = (VAL))                          \
3368    : (DECL_TEMPLATE_INFO (TYPE_NAME (NODE)) = (VAL)))
3369
3370 #define TI_TEMPLATE(NODE) TREE_TYPE (TEMPLATE_INFO_CHECK (NODE))
3371 #define TI_ARGS(NODE) TREE_CHAIN (TEMPLATE_INFO_CHECK (NODE))
3372 #define TI_PENDING_TEMPLATE_FLAG(NODE) \
3373   TREE_LANG_FLAG_1 (TEMPLATE_INFO_CHECK (NODE))
3374 /* For a given TREE_VEC containing a template argument list,
3375    this property contains the number of arguments that are not
3376    defaulted.  */
3377 #define NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) \
3378   TREE_CHAIN (TREE_VEC_CHECK (NODE))
3379
3380 /* Below are the setter and getter of the NON_DEFAULT_TEMPLATE_ARGS_COUNT
3381    property.  */
3382 #define SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE, INT_VALUE) \
3383   NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) = build_int_cst (NULL_TREE, INT_VALUE)
3384 #if CHECKING_P
3385 #define GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) \
3386     int_cst_value (NON_DEFAULT_TEMPLATE_ARGS_COUNT (NODE))
3387 #else
3388 #define GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) \
3389   NON_DEFAULT_TEMPLATE_ARGS_COUNT (NODE) \
3390   ? int_cst_value (NON_DEFAULT_TEMPLATE_ARGS_COUNT (NODE)) \
3391   : TREE_VEC_LENGTH (INNERMOST_TEMPLATE_ARGS (NODE))
3392 #endif
3393 /* The list of typedefs - used in the template - that need
3394    access checking at template instantiation time.
3395
3396    FIXME this should be associated with the TEMPLATE_DECL, not the
3397    TEMPLATE_INFO.  */
3398 #define TI_TYPEDEFS_NEEDING_ACCESS_CHECKING(NODE) \
3399   ((struct tree_template_info*)TEMPLATE_INFO_CHECK \
3400      (NODE))->typedefs_needing_access_checking
3401
3402 /* We use TREE_VECs to hold template arguments.  If there is only one
3403    level of template arguments, then the TREE_VEC contains the
3404    arguments directly.  If there is more than one level of template
3405    arguments, then each entry in the TREE_VEC is itself a TREE_VEC,
3406    containing the template arguments for a single level.  The first
3407    entry in the outer TREE_VEC is the outermost level of template
3408    parameters; the last is the innermost.
3409
3410    It is incorrect to ever form a template argument vector containing
3411    only one level of arguments, but which is a TREE_VEC containing as
3412    its only entry the TREE_VEC for that level.
3413
3414    For each TREE_VEC containing the template arguments for a single
3415    level, it's possible to get or set the number of non defaulted
3416    template arguments by using the accessor macros
3417    GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT or
3418    SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT.  */
3419
3420 /* Nonzero if the template arguments is actually a vector of vectors,
3421    rather than just a vector.  */
3422 #define TMPL_ARGS_HAVE_MULTIPLE_LEVELS(NODE)                 \
3423   (NODE && TREE_VEC_LENGTH (NODE) && TREE_VEC_ELT (NODE, 0)  \
3424    && TREE_CODE (TREE_VEC_ELT (NODE, 0)) == TREE_VEC)
3425
3426 /* The depth of a template argument vector.  When called directly by
3427    the parser, we use a TREE_LIST rather than a TREE_VEC to represent
3428    template arguments.  In fact, we may even see NULL_TREE if there
3429    are no template arguments.  In both of those cases, there is only
3430    one level of template arguments.  */
3431 #define TMPL_ARGS_DEPTH(NODE)                                   \
3432   (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (NODE) ? TREE_VEC_LENGTH (NODE) : 1)
3433
3434 /* The LEVELth level of the template ARGS.  The outermost level of
3435    args is level 1, not level 0.  */
3436 #define TMPL_ARGS_LEVEL(ARGS, LEVEL)            \
3437   (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (ARGS)        \
3438    ? TREE_VEC_ELT (ARGS, (LEVEL) - 1) : (ARGS))
3439
3440 /* Set the LEVELth level of the template ARGS to VAL.  This macro does
3441    not work with single-level argument vectors.  */
3442 #define SET_TMPL_ARGS_LEVEL(ARGS, LEVEL, VAL)   \
3443   (TREE_VEC_ELT (ARGS, (LEVEL) - 1) = (VAL))
3444
3445 /* Accesses the IDXth parameter in the LEVELth level of the ARGS.  */
3446 #define TMPL_ARG(ARGS, LEVEL, IDX)                              \
3447   (TREE_VEC_ELT (TMPL_ARGS_LEVEL (ARGS, LEVEL), IDX))
3448
3449 /* Given a single level of template arguments in NODE, return the
3450    number of arguments.  */
3451 #define NUM_TMPL_ARGS(NODE)                             \
3452   (TREE_VEC_LENGTH (NODE))
3453
3454 /* Returns the innermost level of template arguments in ARGS.  */
3455 #define INNERMOST_TEMPLATE_ARGS(NODE) \
3456   (get_innermost_template_args ((NODE), 1))
3457
3458 /* The number of levels of template parameters given by NODE.  */
3459 #define TMPL_PARMS_DEPTH(NODE) \
3460   ((HOST_WIDE_INT) TREE_INT_CST_LOW (TREE_PURPOSE (NODE)))
3461
3462 /* The TEMPLATE_DECL instantiated or specialized by NODE.  This
3463    TEMPLATE_DECL will be the immediate parent, not the most general
3464    template.  For example, in:
3465
3466       template <class T> struct S { template <class U> void f(U); }
3467
3468    the FUNCTION_DECL for S<int>::f<double> will have, as its
3469    DECL_TI_TEMPLATE, `template <class U> S<int>::f<U>'.
3470
3471    As a special case, for a member friend template of a template
3472    class, this value will not be a TEMPLATE_DECL, but rather an
3473    IDENTIFIER_NODE or OVERLOAD indicating the name of the template and
3474    any explicit template arguments provided.  For example, in:
3475
3476      template <class T> struct S { friend void f<int>(int, double); }
3477
3478    the DECL_TI_TEMPLATE will be an IDENTIFIER_NODE for `f' and the
3479    DECL_TI_ARGS will be {int}.
3480
3481    For a FIELD_DECL with a non-static data member initializer, this value
3482    is the FIELD_DECL it was instantiated from.  */
3483 #define DECL_TI_TEMPLATE(NODE)      TI_TEMPLATE (DECL_TEMPLATE_INFO (NODE))
3484
3485 /* The template arguments used to obtain this decl from the most
3486    general form of DECL_TI_TEMPLATE.  For the example given for
3487    DECL_TI_TEMPLATE, the DECL_TI_ARGS will be {int, double}.  These
3488    are always the full set of arguments required to instantiate this
3489    declaration from the most general template specialized here.  */
3490 #define DECL_TI_ARGS(NODE)          TI_ARGS (DECL_TEMPLATE_INFO (NODE))
3491
3492 /* The TEMPLATE_DECL associated with NODE, a class type.  Even if NODE
3493    will be generated from a partial specialization, the TEMPLATE_DECL
3494    referred to here will be the original template.  For example,
3495    given:
3496
3497       template <typename T> struct S {};
3498       template <typename T> struct S<T*> {};
3499
3500    the CLASSTPYE_TI_TEMPLATE for S<int*> will be S, not the S<T*>.  */
3501 #define CLASSTYPE_TI_TEMPLATE(NODE) TI_TEMPLATE (CLASSTYPE_TEMPLATE_INFO (NODE))
3502 #define CLASSTYPE_TI_ARGS(NODE)     TI_ARGS (CLASSTYPE_TEMPLATE_INFO (NODE))
3503
3504 /* For a template instantiation TYPE, returns the TYPE corresponding
3505    to the primary template.  Otherwise returns TYPE itself.  */
3506 #define CLASSTYPE_PRIMARY_TEMPLATE_TYPE(TYPE)                           \
3507   ((CLASSTYPE_USE_TEMPLATE ((TYPE))                                     \
3508     && !CLASSTYPE_TEMPLATE_SPECIALIZATION ((TYPE)))                     \
3509    ? TREE_TYPE (DECL_TEMPLATE_RESULT (DECL_PRIMARY_TEMPLATE             \
3510                                       (CLASSTYPE_TI_TEMPLATE ((TYPE))))) \
3511    : (TYPE))
3512
3513 /* Like CLASS_TI_TEMPLATE, but also works for ENUMERAL_TYPEs.  */
3514 #define TYPE_TI_TEMPLATE(NODE)                  \
3515   (TI_TEMPLATE (TYPE_TEMPLATE_INFO (NODE)))
3516
3517 /* Like DECL_TI_ARGS, but for an ENUMERAL_, RECORD_, or UNION_TYPE.  */
3518 #define TYPE_TI_ARGS(NODE)                      \
3519   (TI_ARGS (TYPE_TEMPLATE_INFO (NODE)))
3520
3521 #define INNERMOST_TEMPLATE_PARMS(NODE)  TREE_VALUE (NODE)
3522
3523 /* Nonzero if NODE (a TEMPLATE_DECL) is a member template, in the
3524    sense of [temp.mem].  */
3525 #define DECL_MEMBER_TEMPLATE_P(NODE) \
3526   (DECL_LANG_FLAG_1 (TEMPLATE_DECL_CHECK (NODE)))
3527
3528 /* Nonzero if the NODE corresponds to the template parameters for a
3529    member template, whose inline definition is being processed after
3530    the class definition is complete.  */
3531 #define TEMPLATE_PARMS_FOR_INLINE(NODE) TREE_LANG_FLAG_1 (NODE)
3532
3533 /* Determine if a declaration (PARM_DECL or FIELD_DECL) is a pack.  */
3534 #define DECL_PACK_P(NODE) \
3535   (DECL_P (NODE) && PACK_EXPANSION_P (TREE_TYPE (NODE)))
3536
3537 /* Determines if NODE is an expansion of one or more parameter packs,
3538    e.g., a TYPE_PACK_EXPANSION or EXPR_PACK_EXPANSION.  */
3539 #define PACK_EXPANSION_P(NODE)                 \
3540   (TREE_CODE (NODE) == TYPE_PACK_EXPANSION     \
3541    || TREE_CODE (NODE) == EXPR_PACK_EXPANSION)
3542
3543 /* Extracts the type or expression pattern from a TYPE_PACK_EXPANSION or
3544    EXPR_PACK_EXPANSION.  */
3545 #define PACK_EXPANSION_PATTERN(NODE)                            \
3546   (TREE_CODE (NODE) == TYPE_PACK_EXPANSION ? TREE_TYPE (NODE)    \
3547    : TREE_OPERAND (NODE, 0))
3548
3549 /* Sets the type or expression pattern for a TYPE_PACK_EXPANSION or
3550    EXPR_PACK_EXPANSION.  */
3551 #define SET_PACK_EXPANSION_PATTERN(NODE,VALUE)  \
3552   if (TREE_CODE (NODE) == TYPE_PACK_EXPANSION)  \
3553     TREE_TYPE (NODE) = VALUE;                   \
3554   else                                          \
3555     TREE_OPERAND (NODE, 0) = VALUE
3556
3557 /* The list of parameter packs used in the PACK_EXPANSION_* node. The
3558    TREE_VALUE of each TREE_LIST contains the parameter packs.  */
3559 #define PACK_EXPANSION_PARAMETER_PACKS(NODE)            \
3560   *(TREE_CODE (NODE) == EXPR_PACK_EXPANSION             \
3561     ? &TREE_OPERAND (NODE, 1)                           \
3562     : &TYPE_MIN_VALUE_RAW (TYPE_PACK_EXPANSION_CHECK (NODE)))
3563
3564 /* Any additional template args to be applied when substituting into
3565    the pattern, set by tsubst_pack_expansion for partial instantiations.
3566    If this is a TREE_LIST, the TREE_VALUE of the first element is the
3567    usual template argument TREE_VEC, and the TREE_PURPOSE of later elements
3568    are enclosing functions that provided function parameter packs we'll need
3569    to map appropriately.  */
3570 #define PACK_EXPANSION_EXTRA_ARGS(NODE)         \
3571   *(TREE_CODE (NODE) == TYPE_PACK_EXPANSION     \
3572     ? &TYPE_MAX_VALUE_RAW (NODE)                        \
3573     : &TREE_OPERAND ((NODE), 2))
3574
3575 /* True iff this pack expansion is within a function context.  */
3576 #define PACK_EXPANSION_LOCAL_P(NODE) TREE_LANG_FLAG_0 (NODE)
3577
3578 /* True iff this pack expansion is for sizeof....  */
3579 #define PACK_EXPANSION_SIZEOF_P(NODE) TREE_LANG_FLAG_1 (NODE)
3580
3581 /* True iff the wildcard can match a template parameter pack.  */
3582 #define WILDCARD_PACK_P(NODE) TREE_LANG_FLAG_0 (NODE)
3583
3584 /* Determine if this is an argument pack.  */
3585 #define ARGUMENT_PACK_P(NODE)                          \
3586   (TREE_CODE (NODE) == TYPE_ARGUMENT_PACK              \
3587    || TREE_CODE (NODE) == NONTYPE_ARGUMENT_PACK)
3588
3589 /* The arguments stored in an argument pack. Arguments are stored in a
3590    TREE_VEC, which may have length zero.  */
3591 #define ARGUMENT_PACK_ARGS(NODE)                               \
3592   (TREE_CODE (NODE) == TYPE_ARGUMENT_PACK? TREE_TYPE (NODE)    \
3593    : TREE_OPERAND (NODE, 0))
3594
3595 /* Set the arguments stored in an argument pack. VALUE must be a
3596    TREE_VEC.  */
3597 #define SET_ARGUMENT_PACK_ARGS(NODE,VALUE)     \
3598   if (TREE_CODE (NODE) == TYPE_ARGUMENT_PACK)  \
3599     TREE_TYPE (NODE) = VALUE;                           \
3600   else                                                  \
3601     TREE_OPERAND (NODE, 0) = VALUE
3602
3603 /* Whether the argument pack is "incomplete", meaning that more
3604    arguments can still be deduced. Incomplete argument packs are only
3605    used when the user has provided an explicit template argument list
3606    for a variadic function template. Some of the explicit template
3607    arguments will be placed into the beginning of the argument pack,
3608    but additional arguments might still be deduced.  */
3609 #define ARGUMENT_PACK_INCOMPLETE_P(NODE)        \
3610   TREE_ADDRESSABLE (ARGUMENT_PACK_ARGS (NODE))
3611
3612 /* When ARGUMENT_PACK_INCOMPLETE_P, stores the explicit template
3613    arguments used to fill this pack.  */
3614 #define ARGUMENT_PACK_EXPLICIT_ARGS(NODE)       \
3615   TREE_TYPE (ARGUMENT_PACK_ARGS (NODE))
3616
3617 /* In an ARGUMENT_PACK_SELECT, the argument pack from which an
3618    argument will be selected.  */
3619 #define ARGUMENT_PACK_SELECT_FROM_PACK(NODE)                            \
3620   (((struct tree_argument_pack_select *)ARGUMENT_PACK_SELECT_CHECK (NODE))->argument_pack)
3621
3622 /* In an ARGUMENT_PACK_SELECT, the index of the argument we want to
3623    select.  */
3624 #define ARGUMENT_PACK_SELECT_INDEX(NODE)                                \
3625   (((struct tree_argument_pack_select *)ARGUMENT_PACK_SELECT_CHECK (NODE))->index)
3626
3627 #define FOLD_EXPR_CHECK(NODE)                                           \
3628   TREE_CHECK4 (NODE, UNARY_LEFT_FOLD_EXPR, UNARY_RIGHT_FOLD_EXPR,       \
3629                BINARY_LEFT_FOLD_EXPR, BINARY_RIGHT_FOLD_EXPR)
3630
3631 #define BINARY_FOLD_EXPR_CHECK(NODE) \
3632   TREE_CHECK2 (NODE, BINARY_LEFT_FOLD_EXPR, BINARY_RIGHT_FOLD_EXPR)
3633
3634 /* True if NODE is UNARY_FOLD_EXPR or a BINARY_FOLD_EXPR */
3635 #define FOLD_EXPR_P(NODE)                               \
3636   (TREE_CODE (NODE) == UNARY_LEFT_FOLD_EXPR             \
3637    || TREE_CODE (NODE) == UNARY_RIGHT_FOLD_EXPR         \
3638    || TREE_CODE (NODE) == BINARY_LEFT_FOLD_EXPR         \
3639    || TREE_CODE (NODE) == BINARY_RIGHT_FOLD_EXPR)
3640
3641 /* True when NODE is a fold over a compound assignment operator. */
3642 #define FOLD_EXPR_MODIFY_P(NODE) \
3643   TREE_LANG_FLAG_0 (FOLD_EXPR_CHECK (NODE))
3644
3645 /* An INTEGER_CST containing the tree code of the folded operator. */
3646 #define FOLD_EXPR_OP(NODE) \
3647   TREE_OPERAND (FOLD_EXPR_CHECK (NODE), 0)
3648
3649 /* The expression containing an unexpanded parameter pack. */
3650 #define FOLD_EXPR_PACK(NODE) \
3651   TREE_OPERAND (FOLD_EXPR_CHECK (NODE), 1)
3652
3653 /* In a binary fold expression, the argument with no unexpanded
3654    parameter packs. */
3655 #define FOLD_EXPR_INIT(NODE) \
3656   TREE_OPERAND (BINARY_FOLD_EXPR_CHECK (NODE), 2)
3657
3658 /* In a FUNCTION_DECL, the saved language-specific per-function data.  */
3659 #define DECL_SAVED_FUNCTION_DATA(NODE)                  \
3660   (LANG_DECL_FN_CHECK (FUNCTION_DECL_CHECK (NODE))      \
3661    ->u.saved_language_function)
3662
3663 /* True if NODE is an implicit INDIRECT_REF from convert_from_reference.  */
3664 #define REFERENCE_REF_P(NODE)                           \
3665   (INDIRECT_REF_P (NODE)                                \
3666    && TREE_TYPE (TREE_OPERAND (NODE, 0))                \
3667    && TYPE_REF_P (TREE_TYPE (TREE_OPERAND ((NODE), 0))))
3668
3669 /* True if NODE is a REFERENCE_TYPE which is OK to instantiate to be a
3670    reference to VLA type, because it's used for VLA capture.  */
3671 #define REFERENCE_VLA_OK(NODE) \
3672   (TYPE_LANG_FLAG_5 (REFERENCE_TYPE_CHECK (NODE)))
3673
3674 #define NEW_EXPR_USE_GLOBAL(NODE) \
3675   TREE_LANG_FLAG_0 (NEW_EXPR_CHECK (NODE))
3676 #define DELETE_EXPR_USE_GLOBAL(NODE) \
3677   TREE_LANG_FLAG_0 (DELETE_EXPR_CHECK (NODE))
3678 #define DELETE_EXPR_USE_VEC(NODE) \
3679   TREE_LANG_FLAG_1 (DELETE_EXPR_CHECK (NODE))
3680
3681 #define CALL_OR_AGGR_INIT_CHECK(NODE) \
3682   TREE_CHECK2 ((NODE), CALL_EXPR, AGGR_INIT_EXPR)
3683
3684 /* Indicates that this is a non-dependent COMPOUND_EXPR which will
3685    resolve to a function call.  */
3686 #define COMPOUND_EXPR_OVERLOADED(NODE) \
3687   TREE_LANG_FLAG_0 (COMPOUND_EXPR_CHECK (NODE))
3688
3689 /* In a CALL_EXPR appearing in a template, true if Koenig lookup
3690    should be performed at instantiation time.  */
3691 #define KOENIG_LOOKUP_P(NODE) TREE_LANG_FLAG_0 (CALL_EXPR_CHECK (NODE))
3692
3693 /* True if the arguments to NODE should be evaluated in left-to-right
3694    order regardless of PUSH_ARGS_REVERSED.  */
3695 #define CALL_EXPR_ORDERED_ARGS(NODE) \
3696   TREE_LANG_FLAG_3 (CALL_OR_AGGR_INIT_CHECK (NODE))
3697
3698 /* True if the arguments to NODE should be evaluated in right-to-left
3699    order regardless of PUSH_ARGS_REVERSED.  */
3700 #define CALL_EXPR_REVERSE_ARGS(NODE) \
3701   TREE_LANG_FLAG_5 (CALL_OR_AGGR_INIT_CHECK (NODE))
3702
3703 /* True if CALL_EXPR was written as an operator expression, not a function
3704    call.  */
3705 #define CALL_EXPR_OPERATOR_SYNTAX(NODE) \
3706   TREE_LANG_FLAG_6 (CALL_OR_AGGR_INIT_CHECK (NODE))
3707
3708 /* Indicates whether a string literal has been parenthesized. Such
3709    usages are disallowed in certain circumstances.  */
3710
3711 #define PAREN_STRING_LITERAL_P(NODE) \
3712   TREE_LANG_FLAG_0 (STRING_CST_CHECK (NODE))
3713
3714 /* Indicates whether a COMPONENT_REF or a SCOPE_REF has been parenthesized, or
3715    an INDIRECT_REF comes from parenthesizing a _DECL.  Currently only set some
3716    of the time in C++14 mode.  */
3717
3718 #define REF_PARENTHESIZED_P(NODE) \
3719   TREE_LANG_FLAG_2 (TREE_CHECK4 ((NODE), COMPONENT_REF, INDIRECT_REF, SCOPE_REF, VIEW_CONVERT_EXPR))
3720
3721 /* Nonzero if this AGGR_INIT_EXPR provides for initialization via a
3722    constructor call, rather than an ordinary function call.  */
3723 #define AGGR_INIT_VIA_CTOR_P(NODE) \
3724   TREE_LANG_FLAG_0 (AGGR_INIT_EXPR_CHECK (NODE))
3725
3726 /* Nonzero if expanding this AGGR_INIT_EXPR should first zero-initialize
3727    the object.  */
3728 #define AGGR_INIT_ZERO_FIRST(NODE) \
3729   TREE_LANG_FLAG_2 (AGGR_INIT_EXPR_CHECK (NODE))
3730
3731 /* Nonzero means that the call is the jump from a thunk to the
3732    thunked-to function.  */
3733 #define AGGR_INIT_FROM_THUNK_P(NODE) \
3734   (AGGR_INIT_EXPR_CHECK (NODE)->base.protected_flag)
3735
3736 /* AGGR_INIT_EXPR accessors.  These are equivalent to the CALL_EXPR
3737    accessors, except for AGGR_INIT_EXPR_SLOT (which takes the place of
3738    CALL_EXPR_STATIC_CHAIN).  */
3739
3740 #define AGGR_INIT_EXPR_FN(NODE) TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), 1)
3741 #define AGGR_INIT_EXPR_SLOT(NODE) \
3742   TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), 2)
3743 #define AGGR_INIT_EXPR_ARG(NODE, I) \
3744   TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), (I) + 3)
3745 #define aggr_init_expr_nargs(NODE) (VL_EXP_OPERAND_LENGTH(NODE) - 3)
3746
3747 /* AGGR_INIT_EXPR_ARGP returns a pointer to the argument vector for NODE.
3748    We can't use &AGGR_INIT_EXPR_ARG (NODE, 0) because that will complain if
3749    the argument count is zero when checking is enabled.  Instead, do
3750    the pointer arithmetic to advance past the 3 fixed operands in a
3751    AGGR_INIT_EXPR.  That produces a valid pointer to just past the end of
3752    the operand array, even if it's not valid to dereference it.  */
3753 #define AGGR_INIT_EXPR_ARGP(NODE) \
3754   (&(TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), 0)) + 3)
3755
3756 /* Abstract iterators for AGGR_INIT_EXPRs.  */
3757
3758 /* Structure containing iterator state.  */
3759 struct aggr_init_expr_arg_iterator {
3760   tree t;       /* the aggr_init_expr */
3761   int n;        /* argument count */
3762   int i;        /* next argument index */
3763 };
3764
3765 /* Initialize the abstract argument list iterator object ITER with the
3766    arguments from AGGR_INIT_EXPR node EXP.  */
3767 inline void
3768 init_aggr_init_expr_arg_iterator (tree exp,
3769                                        aggr_init_expr_arg_iterator *iter)
3770 {
3771   iter->t = exp;
3772   iter->n = aggr_init_expr_nargs (exp);
3773   iter->i = 0;
3774 }
3775
3776 /* Return the next argument from abstract argument list iterator object ITER,
3777    and advance its state.  Return NULL_TREE if there are no more arguments.  */
3778 inline tree
3779 next_aggr_init_expr_arg (aggr_init_expr_arg_iterator *iter)
3780 {
3781   tree result;
3782   if (iter->i >= iter->n)
3783     return NULL_TREE;
3784   result = AGGR_INIT_EXPR_ARG (iter->t, iter->i);
3785   iter->i++;
3786   return result;
3787 }
3788
3789 /* Initialize the abstract argument list iterator object ITER, then advance
3790    past and return the first argument.  Useful in for expressions, e.g.
3791      for (arg = first_aggr_init_expr_arg (exp, &iter); arg;
3792           arg = next_aggr_init_expr_arg (&iter))   */
3793 inline tree
3794 first_aggr_init_expr_arg (tree exp, aggr_init_expr_arg_iterator *iter)
3795 {
3796   init_aggr_init_expr_arg_iterator (exp, iter);
3797   return next_aggr_init_expr_arg (iter);
3798 }
3799
3800 /* Test whether there are more arguments in abstract argument list iterator
3801    ITER, without changing its state.  */
3802 inline bool
3803 more_aggr_init_expr_args_p (const aggr_init_expr_arg_iterator *iter)
3804 {
3805   return (iter->i < iter->n);
3806 }
3807
3808 /* Iterate through each argument ARG of AGGR_INIT_EXPR CALL, using variable
3809    ITER (of type aggr_init_expr_arg_iterator) to hold the iteration state.  */
3810 #define FOR_EACH_AGGR_INIT_EXPR_ARG(arg, iter, call)                    \
3811   for ((arg) = first_aggr_init_expr_arg ((call), &(iter)); (arg);       \
3812        (arg) = next_aggr_init_expr_arg (&(iter)))
3813
3814 /* VEC_INIT_EXPR accessors.  */
3815 #define VEC_INIT_EXPR_SLOT(NODE) TREE_OPERAND (VEC_INIT_EXPR_CHECK (NODE), 0)
3816 #define VEC_INIT_EXPR_INIT(NODE) TREE_OPERAND (VEC_INIT_EXPR_CHECK (NODE), 1)
3817
3818 /* Indicates that a VEC_INIT_EXPR is a potential constant expression.
3819    Only set when the current function is constexpr.  */
3820 #define VEC_INIT_EXPR_IS_CONSTEXPR(NODE) \
3821   TREE_LANG_FLAG_0 (VEC_INIT_EXPR_CHECK (NODE))
3822
3823 /* Indicates that a VEC_INIT_EXPR is expressing value-initialization.  */
3824 #define VEC_INIT_EXPR_VALUE_INIT(NODE) \
3825   TREE_LANG_FLAG_1 (VEC_INIT_EXPR_CHECK (NODE))
3826
3827 /* The condition under which this MUST_NOT_THROW_EXPR actually blocks
3828    exceptions.  NULL_TREE means 'true'.  */
3829 #define MUST_NOT_THROW_COND(NODE) \
3830   TREE_OPERAND (MUST_NOT_THROW_EXPR_CHECK (NODE), 1)
3831
3832 /* The TYPE_MAIN_DECL for a class template type is a TYPE_DECL, not a
3833    TEMPLATE_DECL.  This macro determines whether or not a given class
3834    type is really a template type, as opposed to an instantiation or
3835    specialization of one.  */
3836 #define CLASSTYPE_IS_TEMPLATE(NODE)  \
3837   (CLASSTYPE_TEMPLATE_INFO (NODE)    \
3838    && !CLASSTYPE_USE_TEMPLATE (NODE) \
3839    && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (NODE)))
3840
3841 /* The name used by the user to name the typename type.  Typically,
3842    this is an IDENTIFIER_NODE, and the same as the DECL_NAME on the
3843    corresponding TYPE_DECL.  However, this may also be a
3844    TEMPLATE_ID_EXPR if we had something like `typename X::Y<T>'.  */
3845 #define TYPENAME_TYPE_FULLNAME(NODE) \
3846   (TYPE_VALUES_RAW (TYPENAME_TYPE_CHECK (NODE)))
3847
3848 /* True if a TYPENAME_TYPE was declared as an "enum".  */
3849 #define TYPENAME_IS_ENUM_P(NODE) \
3850   (TREE_LANG_FLAG_0 (TYPENAME_TYPE_CHECK (NODE)))
3851
3852 /* True if a TYPENAME_TYPE was declared as a "class", "struct", or
3853    "union".  */
3854 #define TYPENAME_IS_CLASS_P(NODE) \
3855   (TREE_LANG_FLAG_1 (TYPENAME_TYPE_CHECK (NODE)))
3856
3857 /* True if a TYPENAME_TYPE is in the process of being resolved.  */
3858 #define TYPENAME_IS_RESOLVING_P(NODE) \
3859   (TREE_LANG_FLAG_2 (TYPENAME_TYPE_CHECK (NODE)))
3860
3861 /* [class.virtual]
3862
3863    A class that declares or inherits a virtual function is called a
3864    polymorphic class.  */
3865 #define TYPE_POLYMORPHIC_P(NODE) (TREE_LANG_FLAG_2 (NODE))
3866
3867 /* Nonzero if this class has a virtual function table pointer.  */
3868 #define TYPE_CONTAINS_VPTR_P(NODE)              \
3869   (TYPE_POLYMORPHIC_P (NODE) || CLASSTYPE_VBASECLASSES (NODE))
3870
3871 /* Nonzero if NODE is a FUNCTION_DECL (for a function with global
3872    scope) declared in a local scope.  */
3873 #define DECL_LOCAL_FUNCTION_P(NODE) \
3874   DECL_LANG_FLAG_0 (FUNCTION_DECL_CHECK (NODE))
3875
3876 /* Nonzero if NODE is the target for genericization of 'break' stmts.  */
3877 #define LABEL_DECL_BREAK(NODE) \
3878   DECL_LANG_FLAG_0 (LABEL_DECL_CHECK (NODE))
3879
3880 /* Nonzero if NODE is the target for genericization of 'continue' stmts.  */
3881 #define LABEL_DECL_CONTINUE(NODE) \
3882   DECL_LANG_FLAG_1 (LABEL_DECL_CHECK (NODE))
3883
3884 /* Nonzero if NODE is the target for genericization of 'return' stmts
3885    in constructors/destructors of targetm.cxx.cdtor_returns_this targets.  */
3886 #define LABEL_DECL_CDTOR(NODE) \
3887   DECL_LANG_FLAG_2 (LABEL_DECL_CHECK (NODE))
3888
3889 /* True if NODE was declared with auto in its return type, but it has
3890    started compilation and so the return type might have been changed by
3891    return type deduction; its declared return type should be found in
3892    DECL_STRUCT_FUNCTION(NODE)->language->x_auto_return_pattern.  */
3893 #define FNDECL_USED_AUTO(NODE) \
3894   TREE_LANG_FLAG_2 (FUNCTION_DECL_CHECK (NODE))
3895
3896 /* Nonzero if NODE is a DECL which we know about but which has not
3897    been explicitly declared, such as a built-in function or a friend
3898    declared inside a class.  In the latter case DECL_HIDDEN_FRIEND_P
3899    will be set.  */
3900 #define DECL_ANTICIPATED(NODE) \
3901   (DECL_LANG_SPECIFIC (TYPE_FUNCTION_OR_TEMPLATE_DECL_CHECK (NODE)) \
3902    ->u.base.anticipated_p)
3903
3904 /* Is DECL NODE a hidden name?  */
3905 #define DECL_HIDDEN_P(NODE) \
3906   (DECL_LANG_SPECIFIC (NODE) && TYPE_FUNCTION_OR_TEMPLATE_DECL_P (NODE) \
3907    && DECL_ANTICIPATED (NODE))
3908
3909 /* True if this is a hidden class type.    */
3910 #define TYPE_HIDDEN_P(NODE) \
3911   (DECL_LANG_SPECIFIC (TYPE_NAME (NODE)) \
3912    && DECL_ANTICIPATED (TYPE_NAME (NODE)))
3913
3914 /* True for artificial decls added for OpenMP privatized non-static
3915    data members.  */
3916 #define DECL_OMP_PRIVATIZED_MEMBER(NODE) \
3917   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.anticipated_p)
3918
3919 /* Nonzero if NODE is a FUNCTION_DECL which was declared as a friend
3920    within a class but has not been declared in the surrounding scope.
3921    The function is invisible except via argument dependent lookup.  */
3922 #define DECL_HIDDEN_FRIEND_P(NODE) \
3923   (LANG_DECL_FN_CHECK (DECL_COMMON_CHECK (NODE))->hidden_friend_p)
3924
3925 /* Nonzero if NODE is an artificial FUNCTION_DECL for
3926    #pragma omp declare reduction.  */
3927 #define DECL_OMP_DECLARE_REDUCTION_P(NODE) \
3928   (LANG_DECL_FN_CHECK (DECL_COMMON_CHECK (NODE))->omp_declare_reduction_p)
3929
3930 /* Nonzero if DECL has been declared threadprivate by
3931    #pragma omp threadprivate.  */
3932 #define CP_DECL_THREADPRIVATE_P(DECL) \
3933   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (DECL))->u.base.threadprivate_or_deleted_p)
3934
3935 /* Nonzero if NODE is a VAR_DECL which has been declared inline.  */
3936 #define DECL_VAR_DECLARED_INLINE_P(NODE) \
3937   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))                   \
3938    ? DECL_LANG_SPECIFIC (NODE)->u.base.var_declared_inline_p    \
3939    : false)
3940 #define SET_DECL_VAR_DECLARED_INLINE_P(NODE) \
3941   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.var_declared_inline_p \
3942    = true)
3943
3944 /* True if NODE is a constant variable with a value-dependent initializer.  */
3945 #define DECL_DEPENDENT_INIT_P(NODE)                             \
3946   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))                   \
3947    && DECL_LANG_SPECIFIC (NODE)->u.base.dependent_init_p)
3948 #define SET_DECL_DEPENDENT_INIT_P(NODE, X) \
3949   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.dependent_init_p = (X))
3950
3951 /* Nonzero if NODE is an artificial VAR_DECL for a C++17 structured binding
3952    declaration or one of VAR_DECLs for the user identifiers in it.  */
3953 #define DECL_DECOMPOSITION_P(NODE) \
3954   (VAR_P (NODE) && DECL_LANG_SPECIFIC (NODE)                    \
3955    ? DECL_LANG_SPECIFIC (NODE)->u.base.selector == lds_decomp           \
3956    : false)
3957
3958 /* The underlying artificial VAR_DECL for structured binding.  */
3959 #define DECL_DECOMP_BASE(NODE) \
3960   (LANG_DECL_DECOMP_CHECK (NODE)->base)
3961
3962 /* Nonzero if NODE is an inline VAR_DECL.  In C++17, static data members
3963    declared with constexpr specifier are implicitly inline variables.  */
3964 #define DECL_INLINE_VAR_P(NODE) \
3965   (DECL_VAR_DECLARED_INLINE_P (NODE)                            \
3966    || (cxx_dialect >= cxx17                                     \
3967        && DECL_DECLARED_CONSTEXPR_P (NODE)                      \
3968        && DECL_CLASS_SCOPE_P (NODE)))
3969
3970 /* Nonzero if DECL was declared with '= delete'.  */
3971 #define DECL_DELETED_FN(DECL) \
3972   (LANG_DECL_FN_CHECK (DECL)->min.base.threadprivate_or_deleted_p)
3973
3974 /* Nonzero if DECL was declared with '= default' (maybe implicitly).  */
3975 #define DECL_DEFAULTED_FN(DECL) \
3976   (LANG_DECL_FN_CHECK (DECL)->defaulted_p)
3977
3978 /* Nonzero if DECL is explicitly defaulted in the class body.  */
3979 #define DECL_DEFAULTED_IN_CLASS_P(DECL)                                 \
3980   (DECL_DEFAULTED_FN (DECL) && DECL_INITIALIZED_IN_CLASS_P (DECL))
3981 /* Nonzero if DECL was defaulted outside the class body.  */
3982 #define DECL_DEFAULTED_OUTSIDE_CLASS_P(DECL)                            \
3983   (DECL_DEFAULTED_FN (DECL)                                             \
3984    && !(DECL_ARTIFICIAL (DECL) || DECL_INITIALIZED_IN_CLASS_P (DECL)))
3985
3986 /* Record whether a typedef for type `int' was actually `signed int'.  */
3987 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
3988
3989 /* Returns nonzero if DECL has external linkage, as specified by the
3990    language standard.  (This predicate may hold even when the
3991    corresponding entity is not actually given external linkage in the
3992    object file; see decl_linkage for details.)  */
3993 #define DECL_EXTERNAL_LINKAGE_P(DECL) \
3994   (decl_linkage (DECL) == lk_external)
3995
3996 /* Keep these codes in ascending code order.  */
3997
3998 #define INTEGRAL_CODE_P(CODE)   \
3999   ((CODE) == ENUMERAL_TYPE      \
4000    || (CODE) == BOOLEAN_TYPE    \
4001    || (CODE) == INTEGER_TYPE)
4002
4003 /* [basic.fundamental]
4004
4005    Types  bool, char, wchar_t, and the signed and unsigned integer types
4006    are collectively called integral types.
4007
4008    Note that INTEGRAL_TYPE_P, as defined in tree.h, allows enumeration
4009    types as well, which is incorrect in C++.  Keep these checks in
4010    ascending code order.  */
4011 #define CP_INTEGRAL_TYPE_P(TYPE)                \
4012   (TREE_CODE (TYPE) == BOOLEAN_TYPE             \
4013    || TREE_CODE (TYPE) == INTEGER_TYPE)
4014
4015 /* Returns true if TYPE is an integral or enumeration name.  Keep
4016    these checks in ascending code order.  */
4017 #define INTEGRAL_OR_ENUMERATION_TYPE_P(TYPE) \
4018    (TREE_CODE (TYPE) == ENUMERAL_TYPE || CP_INTEGRAL_TYPE_P (TYPE))
4019
4020 /* Returns true if TYPE is an integral or unscoped enumeration type.  */
4021 #define INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P(TYPE) \
4022    (UNSCOPED_ENUM_P (TYPE) || CP_INTEGRAL_TYPE_P (TYPE))
4023
4024 /* True if the class type TYPE is a literal type.  */
4025 #define CLASSTYPE_LITERAL_P(TYPE)              \
4026    (LANG_TYPE_CLASS_CHECK (TYPE)->is_literal)
4027
4028 /* [basic.fundamental]
4029
4030    Integral and floating types are collectively called arithmetic
4031    types.
4032
4033    As a GNU extension, we also accept complex types.
4034
4035    Keep these checks in ascending code order.  */
4036 #define ARITHMETIC_TYPE_P(TYPE) \
4037   (CP_INTEGRAL_TYPE_P (TYPE) \
4038    || TREE_CODE (TYPE) == REAL_TYPE \
4039    || TREE_CODE (TYPE) == COMPLEX_TYPE)
4040
4041 /* True iff TYPE is cv decltype(nullptr).  */
4042 #define NULLPTR_TYPE_P(TYPE) (TREE_CODE (TYPE) == NULLPTR_TYPE)
4043
4044 /* [basic.types]
4045
4046    Arithmetic types, enumeration types, pointer types,
4047    pointer-to-member types, and std::nullptr_t are collectively called
4048    scalar types.
4049
4050    Keep these checks in ascending code order.  */
4051 #define SCALAR_TYPE_P(TYPE)                     \
4052   (TYPE_PTRDATAMEM_P (TYPE)                     \
4053    || TREE_CODE (TYPE) == ENUMERAL_TYPE         \
4054    || ARITHMETIC_TYPE_P (TYPE)                  \
4055    || TYPE_PTR_P (TYPE)                         \
4056    || TYPE_PTRMEMFUNC_P (TYPE)                  \
4057    || NULLPTR_TYPE_P (TYPE))
4058
4059 /* Determines whether this type is a C++0x scoped enumeration
4060    type. Scoped enumerations types are introduced via "enum class" or
4061    "enum struct", e.g.,
4062
4063      enum class Color {
4064        Red, Green, Blue
4065      };
4066
4067    Scoped enumeration types are different from normal (unscoped)
4068    enumeration types in several ways:
4069
4070      - The enumerators of a scoped enumeration type are only available
4071        within the scope of the enumeration type and not in the
4072        enclosing scope. For example, the Red color can be referred to
4073        with "Color::Red" but not "Red".
4074
4075      - Scoped enumerators and enumerations do not implicitly convert
4076        to integers or 'bool'.
4077
4078      - The underlying type of the enum is well-defined.  */
4079 #define SCOPED_ENUM_P(TYPE)                                             \
4080   (TREE_CODE (TYPE) == ENUMERAL_TYPE && ENUM_IS_SCOPED (TYPE))
4081
4082 /* Determine whether this is an unscoped enumeration type.  */
4083 #define UNSCOPED_ENUM_P(TYPE)                                           \
4084   (TREE_CODE (TYPE) == ENUMERAL_TYPE && !ENUM_IS_SCOPED (TYPE))
4085
4086 /* Set the flag indicating whether an ENUMERAL_TYPE is a C++0x scoped
4087    enumeration type (1) or a normal (unscoped) enumeration type
4088    (0).  */
4089 #define SET_SCOPED_ENUM_P(TYPE, VAL)                    \
4090   (ENUM_IS_SCOPED (TYPE) = (VAL))
4091
4092 #define SET_OPAQUE_ENUM_P(TYPE, VAL)                    \
4093   (ENUM_IS_OPAQUE (TYPE) = (VAL))
4094
4095 #define OPAQUE_ENUM_P(TYPE)                             \
4096   (TREE_CODE (TYPE) == ENUMERAL_TYPE && ENUM_IS_OPAQUE (TYPE))
4097
4098 /* Determines whether an ENUMERAL_TYPE has an explicit
4099    underlying type.  */
4100 #define ENUM_FIXED_UNDERLYING_TYPE_P(NODE) (TYPE_LANG_FLAG_5 (NODE))
4101
4102 /* Returns the underlying type of the given enumeration type. The
4103    underlying type is determined in different ways, depending on the
4104    properties of the enum:
4105
4106      - In C++0x, the underlying type can be explicitly specified, e.g.,
4107
4108          enum E1 : char { ... } // underlying type is char
4109
4110      - In a C++0x scoped enumeration, the underlying type is int
4111        unless otherwises specified:
4112
4113          enum class E2 { ... } // underlying type is int
4114
4115      - Otherwise, the underlying type is determined based on the
4116        values of the enumerators. In this case, the
4117        ENUM_UNDERLYING_TYPE will not be set until after the definition
4118        of the enumeration is completed by finish_enum.  */
4119 #define ENUM_UNDERLYING_TYPE(TYPE) \
4120   TREE_TYPE (ENUMERAL_TYPE_CHECK (TYPE))
4121
4122 /* [dcl.init.aggr]
4123
4124    An aggregate is an array or a class with no user-provided
4125    constructors, no brace-or-equal-initializers for non-static data
4126    members, no private or protected non-static data members, no
4127    base classes, and no virtual functions.
4128
4129    As an extension, we also treat vectors as aggregates.  Keep these
4130    checks in ascending code order.  */
4131 #define CP_AGGREGATE_TYPE_P(TYPE)                               \
4132   (TREE_CODE (TYPE) == VECTOR_TYPE                              \
4133    ||TREE_CODE (TYPE) == ARRAY_TYPE                             \
4134    || (CLASS_TYPE_P (TYPE) && !CLASSTYPE_NON_AGGREGATE (TYPE)))
4135
4136 /* Nonzero for a class type means that the class type has a
4137    user-declared constructor.  */
4138 #define TYPE_HAS_USER_CONSTRUCTOR(NODE) (TYPE_LANG_FLAG_1 (NODE))
4139
4140 /* Nonzero means that the FUNCTION_TYPE or METHOD_TYPE has a
4141    late-specified return type.  */
4142 #define TYPE_HAS_LATE_RETURN_TYPE(NODE) \
4143   (TYPE_LANG_FLAG_2 (FUNC_OR_METHOD_CHECK (NODE)))
4144
4145 /* When appearing in an INDIRECT_REF, it means that the tree structure
4146    underneath is actually a call to a constructor.  This is needed
4147    when the constructor must initialize local storage (which can
4148    be automatically destroyed), rather than allowing it to allocate
4149    space from the heap.
4150
4151    When appearing in a SAVE_EXPR, it means that underneath
4152    is a call to a constructor.
4153
4154    When appearing in a CONSTRUCTOR, the expression is a
4155    compound literal.
4156
4157    When appearing in a FIELD_DECL, it means that this field
4158    has been duly initialized in its constructor.  */
4159 #define TREE_HAS_CONSTRUCTOR(NODE) (TREE_LANG_FLAG_4 (NODE))
4160
4161 /* True if NODE is a brace-enclosed initializer.  */
4162 #define BRACE_ENCLOSED_INITIALIZER_P(NODE) \
4163   (TREE_CODE (NODE) == CONSTRUCTOR && TREE_TYPE (NODE) == init_list_type_node)
4164
4165 /* True if NODE is a compound-literal, i.e., a brace-enclosed
4166    initializer cast to a particular type.  */
4167 #define COMPOUND_LITERAL_P(NODE) \
4168   (TREE_CODE (NODE) == CONSTRUCTOR && TREE_HAS_CONSTRUCTOR (NODE))
4169
4170 #define EMPTY_CONSTRUCTOR_P(NODE) (TREE_CODE (NODE) == CONSTRUCTOR \
4171                                    && vec_safe_is_empty(CONSTRUCTOR_ELTS(NODE))\
4172                                    && !TREE_HAS_CONSTRUCTOR (NODE))
4173
4174 /* True if NODE is a init-list used as a direct-initializer, i.e.
4175    B b{1,2}, not B b({1,2}) or B b = {1,2}.  */
4176 #define CONSTRUCTOR_IS_DIRECT_INIT(NODE) (TREE_LANG_FLAG_0 (CONSTRUCTOR_CHECK (NODE)))
4177
4178 /* True if this CONSTRUCTOR should not be used as a variable initializer
4179    because it was loaded from a constexpr variable with mutable fields.  */
4180 #define CONSTRUCTOR_MUTABLE_POISON(NODE) \
4181   (TREE_LANG_FLAG_2 (CONSTRUCTOR_CHECK (NODE)))
4182
4183 /* True if this typed CONSTRUCTOR represents C99 compound-literal syntax rather
4184    than C++11 functional cast syntax.  */
4185 #define CONSTRUCTOR_C99_COMPOUND_LITERAL(NODE) \
4186   (TREE_LANG_FLAG_3 (CONSTRUCTOR_CHECK (NODE)))
4187
4188 /* True if this CONSTRUCTOR contains PLACEHOLDER_EXPRs referencing the
4189    CONSTRUCTOR's type not nested inside another CONSTRUCTOR marked with
4190    CONSTRUCTOR_PLACEHOLDER_BOUNDARY.  */
4191 #define CONSTRUCTOR_PLACEHOLDER_BOUNDARY(NODE) \
4192   (TREE_LANG_FLAG_5 (CONSTRUCTOR_CHECK (NODE)))
4193
4194 #define DIRECT_LIST_INIT_P(NODE) \
4195    (BRACE_ENCLOSED_INITIALIZER_P (NODE) && CONSTRUCTOR_IS_DIRECT_INIT (NODE))
4196
4197 /* True if NODE represents a conversion for direct-initialization in a
4198    template.  Set by perform_implicit_conversion_flags.  */
4199 #define IMPLICIT_CONV_EXPR_DIRECT_INIT(NODE) \
4200   (TREE_LANG_FLAG_0 (IMPLICIT_CONV_EXPR_CHECK (NODE)))
4201
4202 /* True if NODE represents a dependent conversion of a non-type template
4203    argument.  Set by maybe_convert_nontype_argument.  */
4204 #define IMPLICIT_CONV_EXPR_NONTYPE_ARG(NODE) \
4205   (TREE_LANG_FLAG_1 (IMPLICIT_CONV_EXPR_CHECK (NODE)))
4206
4207 /* Nonzero means that an object of this type can not be initialized using
4208    an initializer list.  */
4209 #define CLASSTYPE_NON_AGGREGATE(NODE) \
4210   (LANG_TYPE_CLASS_CHECK (NODE)->non_aggregate)
4211 #define TYPE_NON_AGGREGATE_CLASS(NODE) \
4212   (CLASS_TYPE_P (NODE) && CLASSTYPE_NON_AGGREGATE (NODE))
4213
4214 /* Nonzero if there is a non-trivial X::op=(cv X&) for this class.  */
4215 #define TYPE_HAS_COMPLEX_COPY_ASSIGN(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_copy_assign)
4216
4217 /* Nonzero if there is a non-trivial X::X(cv X&) for this class.  */
4218 #define TYPE_HAS_COMPLEX_COPY_CTOR(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_copy_ctor)
4219
4220 /* Nonzero if there is a non-trivial X::op=(X&&) for this class.  */
4221 #define TYPE_HAS_COMPLEX_MOVE_ASSIGN(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_move_assign)
4222
4223 /* Nonzero if there is a non-trivial X::X(X&&) for this class.  */
4224 #define TYPE_HAS_COMPLEX_MOVE_CTOR(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_move_ctor)
4225
4226 /* Nonzero if there is no trivial default constructor for this class.  */
4227 #define TYPE_HAS_COMPLEX_DFLT(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_dflt)
4228
4229 /* Nonzero if TYPE has a trivial destructor.  From [class.dtor]:
4230
4231      A destructor is trivial if it is an implicitly declared
4232      destructor and if:
4233
4234        - all of the direct base classes of its class have trivial
4235          destructors,
4236
4237        - for all of the non-static data members of its class that are
4238          of class type (or array thereof), each such class has a
4239          trivial destructor.  */
4240 #define TYPE_HAS_TRIVIAL_DESTRUCTOR(NODE) \
4241   (!TYPE_HAS_NONTRIVIAL_DESTRUCTOR (NODE))
4242
4243 /* Nonzero for _TYPE node means that this type does not have a trivial
4244    destructor.  Therefore, destroying an object of this type will
4245    involve a call to a destructor.  This can apply to objects of
4246    ARRAY_TYPE is the type of the elements needs a destructor.  */
4247 #define TYPE_HAS_NONTRIVIAL_DESTRUCTOR(NODE) \
4248   (TYPE_LANG_FLAG_4 (NODE))
4249
4250 /* Nonzero for class type means that the default constructor is trivial.  */
4251 #define TYPE_HAS_TRIVIAL_DFLT(NODE) \
4252   (TYPE_HAS_DEFAULT_CONSTRUCTOR (NODE) && ! TYPE_HAS_COMPLEX_DFLT (NODE))
4253
4254 /* Nonzero for class type means that copy initialization of this type can use
4255    a bitwise copy.  */
4256 #define TYPE_HAS_TRIVIAL_COPY_CTOR(NODE) \
4257   (TYPE_HAS_COPY_CTOR (NODE) && ! TYPE_HAS_COMPLEX_COPY_CTOR (NODE))
4258
4259 /* Nonzero for class type means that assignment of this type can use
4260    a bitwise copy.  */
4261 #define TYPE_HAS_TRIVIAL_COPY_ASSIGN(NODE) \
4262   (TYPE_HAS_COPY_ASSIGN (NODE) && ! TYPE_HAS_COMPLEX_COPY_ASSIGN (NODE))
4263
4264 /* Returns true if NODE is a pointer-to-data-member.  */
4265 #define TYPE_PTRDATAMEM_P(NODE)                 \
4266   (TREE_CODE (NODE) == OFFSET_TYPE)
4267
4268 /* Returns true if NODE is a pointer.  */
4269 #define TYPE_PTR_P(NODE)                        \
4270   (TREE_CODE (NODE) == POINTER_TYPE)
4271
4272 /* Returns true if NODE is a reference.  */
4273 #define TYPE_REF_P(NODE)                        \
4274   (TREE_CODE (NODE) == REFERENCE_TYPE)
4275
4276 /* Returns true if NODE is a pointer or a reference.  */
4277 #define INDIRECT_TYPE_P(NODE)                   \
4278   (TYPE_PTR_P (NODE) || TYPE_REF_P (NODE))
4279
4280 /* Returns true if NODE is an object type:
4281
4282      [basic.types]
4283
4284      An object type is a (possibly cv-qualified) type that is not a
4285      function type, not a reference type, and not a void type.
4286
4287    Keep these checks in ascending order, for speed.  */
4288 #define TYPE_OBJ_P(NODE)                        \
4289   (!TYPE_REF_P (NODE)                           \
4290    && !VOID_TYPE_P (NODE)                       \
4291    && TREE_CODE (NODE) != FUNCTION_TYPE         \
4292    && TREE_CODE (NODE) != METHOD_TYPE)
4293
4294 /* Returns true if NODE is a pointer to an object.  Keep these checks
4295    in ascending tree code order.  */
4296 #define TYPE_PTROB_P(NODE)                                      \
4297   (TYPE_PTR_P (NODE) && TYPE_OBJ_P (TREE_TYPE (NODE)))
4298
4299 /* Returns true if NODE is a reference to an object.  Keep these checks
4300    in ascending tree code order.  */
4301 #define TYPE_REF_OBJ_P(NODE)                                    \
4302   (TYPE_REF_P (NODE) && TYPE_OBJ_P (TREE_TYPE (NODE)))
4303
4304 /* Returns true if NODE is a pointer to an object, or a pointer to
4305    void.  Keep these checks in ascending tree code order.  */
4306 #define TYPE_PTROBV_P(NODE)                                     \
4307   (TYPE_PTR_P (NODE)                                            \
4308    && !(TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE           \
4309         || TREE_CODE (TREE_TYPE (NODE)) == METHOD_TYPE))
4310
4311 /* Returns true if NODE is a pointer to function type.  */
4312 #define TYPE_PTRFN_P(NODE)                              \
4313   (TYPE_PTR_P (NODE)                                    \
4314    && TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE)
4315
4316 /* Returns true if NODE is a reference to function type.  */
4317 #define TYPE_REFFN_P(NODE)                              \
4318   (TYPE_REF_P (NODE)                                    \
4319    && TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE)
4320
4321 /* Returns true if NODE is a pointer to member function type.  */
4322 #define TYPE_PTRMEMFUNC_P(NODE)         \
4323   (TREE_CODE (NODE) == RECORD_TYPE      \
4324    && TYPE_PTRMEMFUNC_FLAG (NODE))
4325
4326 #define TYPE_PTRMEMFUNC_FLAG(NODE) \
4327   (TYPE_LANG_FLAG_2 (RECORD_TYPE_CHECK (NODE)))
4328
4329 /* Returns true if NODE is a pointer-to-member.  */
4330 #define TYPE_PTRMEM_P(NODE) \
4331   (TYPE_PTRDATAMEM_P (NODE) || TYPE_PTRMEMFUNC_P (NODE))
4332
4333 /* Returns true if NODE is a pointer or a pointer-to-member.  */
4334 #define TYPE_PTR_OR_PTRMEM_P(NODE) \
4335   (TYPE_PTR_P (NODE) || TYPE_PTRMEM_P (NODE))
4336
4337 /* Indicates when overload resolution may resolve to a pointer to
4338    member function. [expr.unary.op]/3 */
4339 #define PTRMEM_OK_P(NODE) \
4340   TREE_LANG_FLAG_0 (TREE_CHECK3 ((NODE), ADDR_EXPR, OFFSET_REF, SCOPE_REF))
4341
4342 /* Get the POINTER_TYPE to the METHOD_TYPE associated with this
4343    pointer to member function.  TYPE_PTRMEMFUNC_P _must_ be true,
4344    before using this macro.  */
4345 #define TYPE_PTRMEMFUNC_FN_TYPE(NODE) \
4346   (cp_build_qualified_type (TREE_TYPE (TYPE_FIELDS (NODE)),\
4347                             cp_type_quals (NODE)))
4348
4349 /* As above, but can be used in places that want an lvalue at the expense
4350    of not necessarily having the correct cv-qualifiers.  */
4351 #define TYPE_PTRMEMFUNC_FN_TYPE_RAW(NODE) \
4352   (TREE_TYPE (TYPE_FIELDS (NODE)))
4353
4354 /* Returns `A' for a type like `int (A::*)(double)' */
4355 #define TYPE_PTRMEMFUNC_OBJECT_TYPE(NODE) \
4356   TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (NODE)))
4357
4358 /* The canonical internal RECORD_TYPE from the POINTER_TYPE to
4359    METHOD_TYPE.  */
4360 #define TYPE_PTRMEMFUNC_TYPE(NODE) \
4361   TYPE_LANG_SLOT_1 (NODE)
4362
4363 /* For a pointer-to-member type of the form `T X::*', this is `X'.
4364    For a type like `void (X::*)() const', this type is `X', not `const
4365    X'.  To get at the `const X' you have to look at the
4366    TYPE_PTRMEM_POINTED_TO_TYPE; there, the first parameter will have
4367    type `const X*'.  */
4368 #define TYPE_PTRMEM_CLASS_TYPE(NODE)                    \
4369   (TYPE_PTRDATAMEM_P (NODE)                                     \
4370    ? TYPE_OFFSET_BASETYPE (NODE)                \
4371    : TYPE_PTRMEMFUNC_OBJECT_TYPE (NODE))
4372
4373 /* For a pointer-to-member type of the form `T X::*', this is `T'.  */
4374 #define TYPE_PTRMEM_POINTED_TO_TYPE(NODE)               \
4375    (TYPE_PTRDATAMEM_P (NODE)                            \
4376     ? TREE_TYPE (NODE)                                  \
4377     : TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (NODE)))
4378
4379 /* For a pointer-to-member constant `X::Y' this is the RECORD_TYPE for
4380    `X'.  */
4381 #define PTRMEM_CST_CLASS(NODE) \
4382   TYPE_PTRMEM_CLASS_TYPE (TREE_TYPE (PTRMEM_CST_CHECK (NODE)))
4383
4384 /* For a pointer-to-member constant `X::Y' this is the _DECL for
4385    `Y'.  */
4386 #define PTRMEM_CST_MEMBER(NODE) \
4387   (((ptrmem_cst_t)PTRMEM_CST_CHECK (NODE))->member)
4388
4389 /* The expression in question for a TYPEOF_TYPE.  */
4390 #define TYPEOF_TYPE_EXPR(NODE) (TYPE_VALUES_RAW (TYPEOF_TYPE_CHECK (NODE)))
4391
4392 /* The type in question for an UNDERLYING_TYPE.  */
4393 #define UNDERLYING_TYPE_TYPE(NODE) \
4394   (TYPE_VALUES_RAW (UNDERLYING_TYPE_CHECK (NODE)))
4395
4396 /* The type in question for BASES.  */
4397 #define BASES_TYPE(NODE) \
4398   (TYPE_VALUES_RAW (BASES_CHECK (NODE)))
4399
4400 #define BASES_DIRECT(NODE) \
4401   TREE_LANG_FLAG_0 (BASES_CHECK (NODE))
4402
4403 /* The expression in question for a DECLTYPE_TYPE.  */
4404 #define DECLTYPE_TYPE_EXPR(NODE) (TYPE_VALUES_RAW (DECLTYPE_TYPE_CHECK (NODE)))
4405
4406 /* Whether the DECLTYPE_TYPE_EXPR of NODE was originally parsed as an
4407    id-expression or a member-access expression. When false, it was
4408    parsed as a full expression.  */
4409 #define DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P(NODE) \
4410   (DECLTYPE_TYPE_CHECK (NODE))->type_common.string_flag
4411
4412 /* These flags indicate that we want different semantics from normal
4413    decltype: lambda capture just drops references, init capture
4414    uses auto semantics, lambda proxies look through implicit dereference.  */
4415 #define DECLTYPE_FOR_LAMBDA_CAPTURE(NODE) \
4416   TREE_LANG_FLAG_0 (DECLTYPE_TYPE_CHECK (NODE))
4417 #define DECLTYPE_FOR_INIT_CAPTURE(NODE) \
4418   TREE_LANG_FLAG_1 (DECLTYPE_TYPE_CHECK (NODE))
4419 #define DECLTYPE_FOR_LAMBDA_PROXY(NODE) \
4420   TREE_LANG_FLAG_2 (DECLTYPE_TYPE_CHECK (NODE))
4421 #define DECLTYPE_FOR_REF_CAPTURE(NODE) \
4422   TREE_LANG_FLAG_3 (DECLTYPE_TYPE_CHECK (NODE))
4423
4424 /* Nonzero for VAR_DECL and FUNCTION_DECL node means that `extern' was
4425    specified in its declaration.  This can also be set for an
4426    erroneously declared PARM_DECL.  */
4427 #define DECL_THIS_EXTERN(NODE) \
4428   DECL_LANG_FLAG_2 (VAR_FUNCTION_OR_PARM_DECL_CHECK (NODE))
4429
4430 /* Nonzero for VAR_DECL and FUNCTION_DECL node means that `static' was
4431    specified in its declaration.  This can also be set for an
4432    erroneously declared PARM_DECL.  */
4433 #define DECL_THIS_STATIC(NODE) \
4434   DECL_LANG_FLAG_6 (VAR_FUNCTION_OR_PARM_DECL_CHECK (NODE))
4435
4436 /* Nonzero for FIELD_DECL node means that this field is a lambda capture
4437    field for an array of runtime bound.  */
4438 #define DECL_VLA_CAPTURE_P(NODE) \
4439   DECL_LANG_FLAG_1 (FIELD_DECL_CHECK (NODE))
4440
4441 /* Nonzero for PARM_DECL node means that this is an array function
4442    parameter, i.e, a[] rather than *a.  */
4443 #define DECL_ARRAY_PARAMETER_P(NODE) \
4444   DECL_LANG_FLAG_1 (PARM_DECL_CHECK (NODE))
4445
4446 /* Nonzero for a FIELD_DECL who's NSMDI is currently being
4447    instantiated.  */
4448 #define DECL_INSTANTIATING_NSDMI_P(NODE) \
4449   DECL_LANG_FLAG_2 (FIELD_DECL_CHECK (NODE))
4450
4451 /* Nonzero for FIELD_DECL node means that this field is a base class
4452    of the parent object, as opposed to a member field.  */
4453 #define DECL_FIELD_IS_BASE(NODE) \
4454   DECL_LANG_FLAG_6 (FIELD_DECL_CHECK (NODE))
4455
4456 /* Nonzero for FIELD_DECL node means that this field is a simple (no
4457    explicit initializer) lambda capture field, making it invisible to
4458    name lookup in unevaluated contexts.  */
4459 #define DECL_NORMAL_CAPTURE_P(NODE) \
4460   DECL_LANG_FLAG_7 (FIELD_DECL_CHECK (NODE))
4461
4462 /* Nonzero if TYPE is an anonymous union or struct type.  We have to use a
4463    flag for this because "A union for which objects or pointers are
4464    declared is not an anonymous union" [class.union].  */
4465 #define ANON_AGGR_TYPE_P(NODE)                          \
4466   (CLASS_TYPE_P (NODE) && LANG_TYPE_CLASS_CHECK (NODE)->anon_aggr)
4467 #define SET_ANON_AGGR_TYPE_P(NODE)                      \
4468   (LANG_TYPE_CLASS_CHECK (NODE)->anon_aggr = 1)
4469
4470 /* Nonzero if TYPE is an anonymous union type.  */
4471 #define ANON_UNION_TYPE_P(NODE) \
4472   (TREE_CODE (NODE) == UNION_TYPE && ANON_AGGR_TYPE_P (NODE))
4473
4474 /* Define fields and accessors for nodes representing declared names.  */
4475
4476 /* Nonzero if TYPE is an unnamed class with a typedef for linkage purposes.  */
4477 #define TYPE_WAS_UNNAMED(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->was_anonymous)
4478
4479 /* C++: all of these are overloaded!  These apply only to TYPE_DECLs.  */
4480
4481 /* The format of each node in the DECL_FRIENDLIST is as follows:
4482
4483    The TREE_PURPOSE will be the name of a function, i.e., an
4484    IDENTIFIER_NODE.  The TREE_VALUE will be itself a TREE_LIST, whose
4485    TREE_VALUEs are friends with the given name.  */
4486 #define DECL_FRIENDLIST(NODE)           (DECL_INITIAL (NODE))
4487 #define FRIEND_NAME(LIST) (TREE_PURPOSE (LIST))
4488 #define FRIEND_DECLS(LIST) (TREE_VALUE (LIST))
4489
4490 /* The DECL_ACCESS, if non-NULL, is a TREE_LIST.  The TREE_PURPOSE of
4491    each node is a type; the TREE_VALUE is the access granted for this
4492    DECL in that type.  The DECL_ACCESS is set by access declarations.
4493    For example, if a member that would normally be public in a
4494    derived class is made protected, then the derived class and the
4495    protected_access_node will appear in the DECL_ACCESS for the node.  */
4496 #define DECL_ACCESS(NODE) (LANG_DECL_MIN_CHECK (NODE)->access)
4497
4498 /* Nonzero if the FUNCTION_DECL is a global constructor.  */
4499 #define DECL_GLOBAL_CTOR_P(NODE) \
4500   (LANG_DECL_FN_CHECK (NODE)->global_ctor_p)
4501
4502 /* Nonzero if the FUNCTION_DECL is a global destructor.  */
4503 #define DECL_GLOBAL_DTOR_P(NODE) \
4504   (LANG_DECL_FN_CHECK (NODE)->global_dtor_p)
4505
4506 /* Accessor macros for C++ template decl nodes.  */
4507
4508 /* The DECL_TEMPLATE_PARMS are a list.  The TREE_PURPOSE of each node
4509    is a INT_CST whose TREE_INT_CST_LOW indicates the level of the
4510    template parameters, with 1 being the outermost set of template
4511    parameters.  The TREE_VALUE is a vector, whose elements are the
4512    template parameters at each level.  Each element in the vector is a
4513    TREE_LIST, whose TREE_VALUE is a PARM_DECL (if the parameter is a
4514    non-type parameter), or a TYPE_DECL (if the parameter is a type
4515    parameter).  The TREE_PURPOSE is the default value, if any.  The
4516    TEMPLATE_PARM_INDEX for the parameter is available as the
4517    DECL_INITIAL (for a PARM_DECL) or as the TREE_TYPE (for a
4518    TYPE_DECL).
4519
4520    FIXME: CONST_CAST_TREE is a hack that hopefully will go away after
4521    tree is converted to C++ class hiearchy.  */
4522 #define DECL_TEMPLATE_PARMS(NODE)       \
4523    ((struct tree_template_decl *)CONST_CAST_TREE (TEMPLATE_DECL_CHECK (NODE)))->arguments
4524 #define DECL_INNERMOST_TEMPLATE_PARMS(NODE) \
4525    INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (NODE))
4526 #define DECL_NTPARMS(NODE) \
4527    TREE_VEC_LENGTH (DECL_INNERMOST_TEMPLATE_PARMS (NODE))
4528 /* For function, method, class-data templates.
4529
4530    FIXME: CONST_CAST_TREE is a hack that hopefully will go away after
4531    tree is converted to C++ class hiearchy.  */
4532 #define DECL_TEMPLATE_RESULT(NODE)      \
4533    ((struct tree_template_decl *)CONST_CAST_TREE(TEMPLATE_DECL_CHECK (NODE)))->result
4534 /* For a function template at namespace scope, DECL_TEMPLATE_INSTANTIATIONS
4535    lists all instantiations and specializations of the function so that
4536    tsubst_friend_function can reassign them to another template if we find
4537    that the namespace-scope template is really a partial instantiation of a
4538    friend template.
4539
4540    For a class template the DECL_TEMPLATE_INSTANTIATIONS lists holds
4541    all instantiations and specializations of the class type, including
4542    partial instantiations and partial specializations, so that if we
4543    explicitly specialize a partial instantiation we can walk the list
4544    in maybe_process_partial_specialization and reassign them or complain
4545    as appropriate.
4546
4547    In both cases, the TREE_PURPOSE of each node contains the arguments
4548    used; the TREE_VALUE contains the generated variable.  The template
4549    arguments are always complete.  For example, given:
4550
4551       template <class T> struct S1 {
4552         template <class U> struct S2 {};
4553         template <class U> struct S2<U*> {};
4554       };
4555
4556    the record for the partial specialization will contain, as its
4557    argument list, { {T}, {U*} }, and will be on the
4558    DECL_TEMPLATE_INSTANTIATIONS list for `template <class T> template
4559    <class U> struct S1<T>::S2'.
4560
4561    This list is not used for other templates.  */
4562 #define DECL_TEMPLATE_INSTANTIATIONS(NODE) \
4563   DECL_SIZE_UNIT (TEMPLATE_DECL_CHECK (NODE))
4564
4565 /* For a class template, this list contains the partial
4566    specializations of this template.  (Full specializations are not
4567    recorded on this list.)  The TREE_PURPOSE holds the arguments used
4568    in the partial specialization (e.g., for `template <class T> struct
4569    S<T*, int>' this will be `T*, int'.)  The arguments will also include
4570    any outer template arguments.  The TREE_VALUE holds the TEMPLATE_DECL
4571    for the partial specialization.  The TREE_TYPE is the _TYPE node for
4572    the partial specialization.
4573
4574    This list is not used for other templates.  */
4575 #define DECL_TEMPLATE_SPECIALIZATIONS(NODE)     \
4576   DECL_SIZE (TEMPLATE_DECL_CHECK (NODE))
4577
4578 /* Nonzero for a DECL which is actually a template parameter.  Keep
4579    these checks in ascending tree code order.   */
4580 #define DECL_TEMPLATE_PARM_P(NODE)              \
4581   (DECL_LANG_FLAG_0 (NODE)                      \
4582    && (TREE_CODE (NODE) == CONST_DECL           \
4583        || TREE_CODE (NODE) == PARM_DECL         \
4584        || TREE_CODE (NODE) == TYPE_DECL         \
4585        || TREE_CODE (NODE) == TEMPLATE_DECL))
4586
4587 /* Nonzero for a raw template parameter node.  */
4588 #define TEMPLATE_PARM_P(NODE)                                   \
4589   (TREE_CODE (NODE) == TEMPLATE_TYPE_PARM                       \
4590    || TREE_CODE (NODE) == TEMPLATE_TEMPLATE_PARM                \
4591    || TREE_CODE (NODE) == TEMPLATE_PARM_INDEX)
4592
4593 /* Mark NODE as a template parameter.  */
4594 #define SET_DECL_TEMPLATE_PARM_P(NODE) \
4595   (DECL_LANG_FLAG_0 (NODE) = 1)
4596
4597 /* Nonzero if NODE is a template template parameter.  */
4598 #define DECL_TEMPLATE_TEMPLATE_PARM_P(NODE) \
4599   (TREE_CODE (NODE) == TEMPLATE_DECL && DECL_TEMPLATE_PARM_P (NODE))
4600
4601 /* Nonzero for a DECL that represents a function template.  */
4602 #define DECL_FUNCTION_TEMPLATE_P(NODE)                          \
4603   (TREE_CODE (NODE) == TEMPLATE_DECL                            \
4604    && DECL_TEMPLATE_RESULT (NODE) != NULL_TREE                  \
4605    && TREE_CODE (DECL_TEMPLATE_RESULT (NODE)) == FUNCTION_DECL)
4606
4607 /* Nonzero for a DECL that represents a class template or alias
4608    template.  */
4609 #define DECL_TYPE_TEMPLATE_P(NODE)                              \
4610   (TREE_CODE (NODE) == TEMPLATE_DECL                            \
4611    && DECL_TEMPLATE_RESULT (NODE) != NULL_TREE                  \
4612    && TREE_CODE (DECL_TEMPLATE_RESULT (NODE)) == TYPE_DECL)
4613
4614 /* Nonzero for a DECL that represents a class template.  */
4615 #define DECL_CLASS_TEMPLATE_P(NODE)                             \
4616   (DECL_TYPE_TEMPLATE_P (NODE)                                  \
4617    && DECL_IMPLICIT_TYPEDEF_P (DECL_TEMPLATE_RESULT (NODE)))
4618
4619 /* Nonzero for a TEMPLATE_DECL that represents an alias template.  */
4620 #define DECL_ALIAS_TEMPLATE_P(NODE)                     \
4621   (DECL_TYPE_TEMPLATE_P (NODE)                          \
4622    && !DECL_ARTIFICIAL (DECL_TEMPLATE_RESULT (NODE)))
4623
4624 /* Nonzero for a NODE which declares a type.  */
4625 #define DECL_DECLARES_TYPE_P(NODE) \
4626   (TREE_CODE (NODE) == TYPE_DECL || DECL_TYPE_TEMPLATE_P (NODE))
4627
4628 /* Nonzero if NODE declares a function.  */
4629 #define DECL_DECLARES_FUNCTION_P(NODE) \
4630   (TREE_CODE (NODE) == FUNCTION_DECL || DECL_FUNCTION_TEMPLATE_P (NODE))
4631
4632 /* Nonzero if NODE is the typedef implicitly generated for a type when
4633    the type is declared.  In C++, `struct S {};' is roughly
4634    equivalent to `struct S {}; typedef struct S S;' in C.
4635    DECL_IMPLICIT_TYPEDEF_P will hold for the typedef indicated in this
4636    example.  In C++, there is a second implicit typedef for each
4637    class, called the injected-class-name, in the scope of `S' itself, so that
4638    you can say `S::S'.  DECL_SELF_REFERENCE_P will hold for that typedef.  */
4639 #define DECL_IMPLICIT_TYPEDEF_P(NODE) \
4640   (TREE_CODE (NODE) == TYPE_DECL && DECL_LANG_FLAG_2 (NODE))
4641 #define SET_DECL_IMPLICIT_TYPEDEF_P(NODE) \
4642   (DECL_LANG_FLAG_2 (NODE) = 1)
4643 #define DECL_SELF_REFERENCE_P(NODE) \
4644   (TREE_CODE (NODE) == TYPE_DECL && DECL_LANG_FLAG_4 (NODE))
4645 #define SET_DECL_SELF_REFERENCE_P(NODE) \
4646   (DECL_LANG_FLAG_4 (NODE) = 1)
4647
4648 /* A `primary' template is one that has its own template header and is not
4649    a partial specialization.  A member function of a class template is a
4650    template, but not primary.  A member template is primary.  Friend
4651    templates are primary, too.  */
4652
4653 /* Returns the primary template corresponding to these parameters.  */
4654 #define DECL_PRIMARY_TEMPLATE(NODE) \
4655   (TREE_TYPE (DECL_INNERMOST_TEMPLATE_PARMS (NODE)))
4656
4657 /* Returns nonzero if NODE is a primary template.  */
4658 #define PRIMARY_TEMPLATE_P(NODE) (DECL_PRIMARY_TEMPLATE (NODE) == (NODE))
4659
4660 /* Nonzero iff NODE is a specialization of a template.  The value
4661    indicates the type of specializations:
4662
4663      1=implicit instantiation
4664
4665      2=partial or explicit specialization, e.g.:
4666
4667         template <> int min<int> (int, int),
4668
4669      3=explicit instantiation, e.g.:
4670
4671         template int min<int> (int, int);
4672
4673    Note that NODE will be marked as a specialization even if the
4674    template it is instantiating is not a primary template.  For
4675    example, given:
4676
4677      template <typename T> struct O {
4678        void f();
4679        struct I {};
4680      };
4681
4682    both O<int>::f and O<int>::I will be marked as instantiations.
4683
4684    If DECL_USE_TEMPLATE is nonzero, then DECL_TEMPLATE_INFO will also
4685    be non-NULL.  */
4686 #define DECL_USE_TEMPLATE(NODE) (DECL_LANG_SPECIFIC (NODE)->u.base.use_template)
4687
4688 /* Like DECL_USE_TEMPLATE, but for class types.  */
4689 #define CLASSTYPE_USE_TEMPLATE(NODE) \
4690   (LANG_TYPE_CLASS_CHECK (NODE)->use_template)
4691
4692 /* True if NODE is a specialization of a primary template.  */
4693 #define CLASSTYPE_SPECIALIZATION_OF_PRIMARY_TEMPLATE_P(NODE)    \
4694   (CLASS_TYPE_P (NODE)                                          \
4695    && CLASSTYPE_USE_TEMPLATE (NODE)                             \
4696    && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (NODE)))
4697
4698 #define DECL_TEMPLATE_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) & 1)
4699 #define CLASSTYPE_TEMPLATE_INSTANTIATION(NODE) \
4700   (CLASSTYPE_USE_TEMPLATE (NODE) & 1)
4701
4702 #define DECL_TEMPLATE_SPECIALIZATION(NODE) (DECL_USE_TEMPLATE (NODE) == 2)
4703 #define SET_DECL_TEMPLATE_SPECIALIZATION(NODE) (DECL_USE_TEMPLATE (NODE) = 2)
4704
4705 /* Returns true for an explicit or partial specialization of a class
4706    template.  */
4707 #define CLASSTYPE_TEMPLATE_SPECIALIZATION(NODE) \
4708   (CLASSTYPE_USE_TEMPLATE (NODE) == 2)
4709 #define SET_CLASSTYPE_TEMPLATE_SPECIALIZATION(NODE) \
4710   (CLASSTYPE_USE_TEMPLATE (NODE) = 2)
4711
4712 #define DECL_IMPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) == 1)
4713 #define SET_DECL_IMPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) = 1)
4714 #define CLASSTYPE_IMPLICIT_INSTANTIATION(NODE) \
4715   (CLASSTYPE_USE_TEMPLATE (NODE) == 1)
4716 #define SET_CLASSTYPE_IMPLICIT_INSTANTIATION(NODE) \
4717   (CLASSTYPE_USE_TEMPLATE (NODE) = 1)
4718
4719 #define DECL_EXPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) == 3)
4720 #define SET_DECL_EXPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) = 3)
4721 #define CLASSTYPE_EXPLICIT_INSTANTIATION(NODE) \
4722   (CLASSTYPE_USE_TEMPLATE (NODE) == 3)
4723 #define SET_CLASSTYPE_EXPLICIT_INSTANTIATION(NODE) \
4724   (CLASSTYPE_USE_TEMPLATE (NODE) = 3)
4725
4726 /* Nonzero if DECL is a friend function which is an instantiation
4727    from the point of view of the compiler, but not from the point of
4728    view of the language.  For example given:
4729       template <class T> struct S { friend void f(T) {}; };
4730    the declaration of `void f(int)' generated when S<int> is
4731    instantiated will not be a DECL_TEMPLATE_INSTANTIATION, but will be
4732    a DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION.  */
4733 #define DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION(DECL) \
4734   (DECL_LANG_SPECIFIC (DECL) && DECL_TEMPLATE_INFO (DECL) \
4735    && !DECL_USE_TEMPLATE (DECL))
4736
4737 /* Nonzero if DECL is a function generated from a function 'temploid',
4738    i.e. template, member of class template, or dependent friend.  */
4739 #define DECL_TEMPLOID_INSTANTIATION(DECL)               \
4740   (DECL_TEMPLATE_INSTANTIATION (DECL)                   \
4741    || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (DECL))
4742
4743 /* Nonzero if DECL is either defined implicitly by the compiler or
4744    generated from a temploid.  */
4745 #define DECL_GENERATED_P(DECL) \
4746   (DECL_TEMPLOID_INSTANTIATION (DECL) || DECL_DEFAULTED_FN (DECL))
4747
4748 /* Nonzero iff we are currently processing a declaration for an
4749    entity with its own template parameter list, and which is not a
4750    full specialization.  */
4751 #define PROCESSING_REAL_TEMPLATE_DECL_P() \
4752   (!processing_template_parmlist \
4753    && processing_template_decl > template_class_depth (current_scope ()))
4754
4755 /* Nonzero if this VAR_DECL or FUNCTION_DECL has already been
4756    instantiated, i.e. its definition has been generated from the
4757    pattern given in the template.  */
4758 #define DECL_TEMPLATE_INSTANTIATED(NODE) \
4759   DECL_LANG_FLAG_1 (VAR_OR_FUNCTION_DECL_CHECK (NODE))
4760
4761 /* We know what we're doing with this decl now.  */
4762 #define DECL_INTERFACE_KNOWN(NODE) DECL_LANG_FLAG_5 (NODE)
4763
4764 /* DECL_EXTERNAL must be set on a decl until the decl is actually emitted,
4765    so that assemble_external will work properly.  So we have this flag to
4766    tell us whether the decl is really not external.
4767
4768    This flag does not indicate whether or not the decl is defined in the
4769    current translation unit; it indicates whether or not we should emit the
4770    decl at the end of compilation if it is defined and needed.  */
4771 #define DECL_NOT_REALLY_EXTERN(NODE) \
4772   (DECL_LANG_SPECIFIC (NODE)->u.base.not_really_extern)
4773
4774 #define DECL_REALLY_EXTERN(NODE) \
4775   (DECL_EXTERNAL (NODE)                         \
4776    && (!DECL_LANG_SPECIFIC (NODE) || !DECL_NOT_REALLY_EXTERN (NODE)))
4777
4778 /* A thunk is a stub function.
4779
4780    A thunk is an alternate entry point for an ordinary FUNCTION_DECL.
4781    The address of the ordinary FUNCTION_DECL is given by the
4782    DECL_INITIAL, which is always an ADDR_EXPR whose operand is a
4783    FUNCTION_DECL.  The job of the thunk is to either adjust the this
4784    pointer before transferring control to the FUNCTION_DECL, or call
4785    FUNCTION_DECL and then adjust the result value. Note, the result
4786    pointer adjusting thunk must perform a call to the thunked
4787    function, (or be implemented via passing some invisible parameter
4788    to the thunked function, which is modified to perform the
4789    adjustment just before returning).
4790
4791    A thunk may perform either, or both, of the following operations:
4792
4793    o Adjust the this or result pointer by a constant offset.
4794    o Adjust the this or result pointer by looking up a vcall or vbase offset
4795      in the vtable.
4796
4797    A this pointer adjusting thunk converts from a base to a derived
4798    class, and hence adds the offsets. A result pointer adjusting thunk
4799    converts from a derived class to a base, and hence subtracts the
4800    offsets.  If both operations are performed, then the constant
4801    adjustment is performed first for this pointer adjustment and last
4802    for the result pointer adjustment.
4803
4804    The constant adjustment is given by THUNK_FIXED_OFFSET.  If the
4805    vcall or vbase offset is required, THUNK_VIRTUAL_OFFSET is
4806    used. For this pointer adjusting thunks, it is the vcall offset
4807    into the vtable.  For result pointer adjusting thunks it is the
4808    binfo of the virtual base to convert to.  Use that binfo's vbase
4809    offset.
4810
4811    It is possible to have equivalent covariant thunks.  These are
4812    distinct virtual covariant thunks whose vbase offsets happen to
4813    have the same value.  THUNK_ALIAS is used to pick one as the
4814    canonical thunk, which will get all the this pointer adjusting
4815    thunks attached to it.  */
4816
4817 /* An integer indicating how many bytes should be subtracted from the
4818    this or result pointer when this function is called.  */
4819 #define THUNK_FIXED_OFFSET(DECL) \
4820   (DECL_LANG_SPECIFIC (THUNK_FUNCTION_CHECK (DECL))->u.fn.u5.fixed_offset)
4821
4822 /* A tree indicating how to perform the virtual adjustment. For a this
4823    adjusting thunk it is the number of bytes to be added to the vtable
4824    to find the vcall offset. For a result adjusting thunk, it is the
4825    binfo of the relevant virtual base.  If NULL, then there is no
4826    virtual adjust.  (The vptr is always located at offset zero from
4827    the this or result pointer.)  (If the covariant type is within the
4828    class hierarchy being laid out, the vbase index is not yet known
4829    at the point we need to create the thunks, hence the need to use
4830    binfos.)  */
4831
4832 #define THUNK_VIRTUAL_OFFSET(DECL) \
4833   (LANG_DECL_MIN_CHECK (FUNCTION_DECL_CHECK (DECL))->access)
4834
4835 /* A thunk which is equivalent to another thunk.  */
4836 #define THUNK_ALIAS(DECL) \
4837   (DECL_LANG_SPECIFIC (FUNCTION_DECL_CHECK (DECL))->u.min.template_info)
4838
4839 /* For thunk NODE, this is the FUNCTION_DECL thunked to.  It is
4840    possible for the target to be a thunk too.  */
4841 #define THUNK_TARGET(NODE)                              \
4842   (LANG_DECL_FN_CHECK (NODE)->befriending_classes)
4843
4844 /* True for a SCOPE_REF iff the "template" keyword was used to
4845    indicate that the qualified name denotes a template.  */
4846 #define QUALIFIED_NAME_IS_TEMPLATE(NODE) \
4847   (TREE_LANG_FLAG_1 (SCOPE_REF_CHECK (NODE)))
4848
4849 /* True for an OMP_ATOMIC that has dependent parameters.  These are stored
4850    as an expr in operand 1, and integer_zero_node in operand 0.  */
4851 #define OMP_ATOMIC_DEPENDENT_P(NODE) \
4852   (TREE_CODE (TREE_OPERAND (OMP_ATOMIC_CHECK (NODE), 0)) == INTEGER_CST)
4853
4854 /* Used while gimplifying continue statements bound to OMP_FOR nodes.  */
4855 #define OMP_FOR_GIMPLIFYING_P(NODE) \
4856   (TREE_LANG_FLAG_0 (OMP_LOOP_CHECK (NODE)))
4857
4858 /* A language-specific token attached to the OpenMP data clauses to
4859    hold code (or code fragments) related to ctors, dtors, and op=.
4860    See semantics.c for details.  */
4861 #define CP_OMP_CLAUSE_INFO(NODE) \
4862   TREE_TYPE (OMP_CLAUSE_RANGE_CHECK (NODE, OMP_CLAUSE_PRIVATE, \
4863                                      OMP_CLAUSE_LINEAR))
4864
4865 /* Nonzero if this transaction expression's body contains statements.  */
4866 #define TRANSACTION_EXPR_IS_STMT(NODE) \
4867    TREE_LANG_FLAG_0 (TRANSACTION_EXPR_CHECK (NODE))
4868
4869 /* These macros provide convenient access to the various _STMT nodes
4870    created when parsing template declarations.  */
4871 #define TRY_STMTS(NODE)         TREE_OPERAND (TRY_BLOCK_CHECK (NODE), 0)
4872 #define TRY_HANDLERS(NODE)      TREE_OPERAND (TRY_BLOCK_CHECK (NODE), 1)
4873
4874 #define EH_SPEC_STMTS(NODE)     TREE_OPERAND (EH_SPEC_BLOCK_CHECK (NODE), 0)
4875 #define EH_SPEC_RAISES(NODE)    TREE_OPERAND (EH_SPEC_BLOCK_CHECK (NODE), 1)
4876
4877 #define USING_STMT_NAMESPACE(NODE) TREE_OPERAND (USING_STMT_CHECK (NODE), 0)
4878
4879 /* Nonzero if this try block is a function try block.  */
4880 #define FN_TRY_BLOCK_P(NODE)    TREE_LANG_FLAG_3 (TRY_BLOCK_CHECK (NODE))
4881 #define HANDLER_PARMS(NODE)     TREE_OPERAND (HANDLER_CHECK (NODE), 0)
4882 #define HANDLER_BODY(NODE)      TREE_OPERAND (HANDLER_CHECK (NODE), 1)
4883 #define HANDLER_TYPE(NODE)      TREE_TYPE (HANDLER_CHECK (NODE))
4884
4885 /* CLEANUP_STMT accessors.  The statement(s) covered, the cleanup to run
4886    and the VAR_DECL for which this cleanup exists.  */
4887 #define CLEANUP_BODY(NODE)      TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
4888 #define CLEANUP_EXPR(NODE)      TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
4889 #define CLEANUP_DECL(NODE)      TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 2)
4890
4891 /* IF_STMT accessors. These give access to the condition of the if
4892    statement, the then block of the if statement, and the else block
4893    of the if statement if it exists.  */
4894 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
4895 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
4896 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
4897 #define IF_SCOPE(NODE)          TREE_OPERAND (IF_STMT_CHECK (NODE), 3)
4898 #define IF_STMT_CONSTEXPR_P(NODE) TREE_LANG_FLAG_0 (IF_STMT_CHECK (NODE))
4899
4900 /* Like PACK_EXPANSION_EXTRA_ARGS, for constexpr if.  IF_SCOPE is used while
4901    building an IF_STMT; IF_STMT_EXTRA_ARGS is used after it is complete.  */
4902 #define IF_STMT_EXTRA_ARGS(NODE) IF_SCOPE (NODE)
4903
4904 /* WHILE_STMT accessors. These give access to the condition of the
4905    while statement and the body of the while statement, respectively.  */
4906 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
4907 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
4908
4909 /* DO_STMT accessors. These give access to the condition of the do
4910    statement and the body of the do statement, respectively.  */
4911 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
4912 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
4913
4914 /* FOR_STMT accessors. These give access to the init statement,
4915    condition, update expression, and body of the for statement,
4916    respectively.  */
4917 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
4918 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
4919 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
4920 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
4921 #define FOR_SCOPE(NODE)         TREE_OPERAND (FOR_STMT_CHECK (NODE), 4)
4922
4923 /* RANGE_FOR_STMT accessors. These give access to the declarator,
4924    expression, body, and scope of the statement, respectively.  */
4925 #define RANGE_FOR_DECL(NODE)    TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 0)
4926 #define RANGE_FOR_EXPR(NODE)    TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 1)
4927 #define RANGE_FOR_BODY(NODE)    TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 2)
4928 #define RANGE_FOR_SCOPE(NODE)   TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 3)
4929 #define RANGE_FOR_UNROLL(NODE)  TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 4)
4930 #define RANGE_FOR_INIT_STMT(NODE) TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 5)
4931 #define RANGE_FOR_IVDEP(NODE)   TREE_LANG_FLAG_6 (RANGE_FOR_STMT_CHECK (NODE))
4932
4933 #define SWITCH_STMT_COND(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
4934 #define SWITCH_STMT_BODY(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
4935 #define SWITCH_STMT_TYPE(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
4936 #define SWITCH_STMT_SCOPE(NODE) TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 3)
4937 /* True if there are case labels for all possible values of switch cond, either
4938    because there is a default: case label or because the case label ranges cover
4939    all values.  */
4940 #define SWITCH_STMT_ALL_CASES_P(NODE) \
4941   TREE_LANG_FLAG_0 (SWITCH_STMT_CHECK (NODE))
4942 /* True if the body of a switch stmt contains no BREAK_STMTs.  */
4943 #define SWITCH_STMT_NO_BREAK_P(NODE) \
4944   TREE_LANG_FLAG_2 (SWITCH_STMT_CHECK (NODE))
4945
4946 /* STMT_EXPR accessor.  */
4947 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
4948
4949 /* EXPR_STMT accessor. This gives the expression associated with an
4950    expression statement.  */
4951 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
4952
4953 /* True if this TARGET_EXPR was created by build_cplus_new, and so we can
4954    discard it if it isn't useful.  */
4955 #define TARGET_EXPR_IMPLICIT_P(NODE) \
4956   TREE_LANG_FLAG_0 (TARGET_EXPR_CHECK (NODE))
4957
4958 /* True if this TARGET_EXPR is the result of list-initialization of a
4959    temporary.  */
4960 #define TARGET_EXPR_LIST_INIT_P(NODE) \
4961   TREE_LANG_FLAG_1 (TARGET_EXPR_CHECK (NODE))
4962
4963 /* True if this TARGET_EXPR expresses direct-initialization of an object
4964    to be named later.  */
4965 #define TARGET_EXPR_DIRECT_INIT_P(NODE) \
4966   TREE_LANG_FLAG_2 (TARGET_EXPR_CHECK (NODE))
4967
4968 /* True if NODE is a TARGET_EXPR that just expresses a copy of its INITIAL; if
4969    the initializer has void type, it's doing something more complicated.  */
4970 #define SIMPLE_TARGET_EXPR_P(NODE)                              \
4971   (TREE_CODE (NODE) == TARGET_EXPR                              \
4972    && !VOID_TYPE_P (TREE_TYPE (TARGET_EXPR_INITIAL (NODE))))
4973
4974 /* True if EXPR expresses direct-initialization of a TYPE.  */
4975 #define DIRECT_INIT_EXPR_P(TYPE,EXPR)                                   \
4976   (TREE_CODE (EXPR) == TARGET_EXPR && TREE_LANG_FLAG_2 (EXPR)           \
4977    && same_type_ignoring_top_level_qualifiers_p (TYPE, TREE_TYPE (EXPR)))
4978
4979 /* True if this CONVERT_EXPR is for a conversion to virtual base in
4980    an NSDMI, and should be re-evaluated when used in a constructor.  */
4981 #define CONVERT_EXPR_VBASE_PATH(NODE) \
4982   TREE_LANG_FLAG_0 (CONVERT_EXPR_CHECK (NODE))
4983
4984 /* True if SIZEOF_EXPR argument is type.  */
4985 #define SIZEOF_EXPR_TYPE_P(NODE) \
4986   TREE_LANG_FLAG_0 (SIZEOF_EXPR_CHECK (NODE))
4987
4988 /* True if the ALIGNOF_EXPR was spelled "alignof".  */
4989 #define ALIGNOF_EXPR_STD_P(NODE) \
4990   TREE_LANG_FLAG_0 (ALIGNOF_EXPR_CHECK (NODE))
4991
4992 /* An enumeration of the kind of tags that C++ accepts.  */
4993 enum tag_types {
4994   none_type = 0, /* Not a tag type.  */
4995   record_type,   /* "struct" types.  */
4996   class_type,    /* "class" types.  */
4997   union_type,    /* "union" types.  */
4998   enum_type,     /* "enum" types.  */
4999   typename_type, /* "typename" types.  */
5000   scope_type     /* namespace or tagged type name followed by :: */
5001 };
5002
5003 /* The various kinds of lvalues we distinguish.  */
5004 enum cp_lvalue_kind_flags {
5005   clk_none = 0,     /* Things that are not an lvalue.  */
5006   clk_ordinary = 1, /* An ordinary lvalue.  */
5007   clk_rvalueref = 2,/* An xvalue (rvalue formed using an rvalue reference) */
5008   clk_class = 4,    /* A prvalue of class or array type.  */
5009   clk_bitfield = 8, /* An lvalue for a bit-field.  */
5010   clk_packed = 16   /* An lvalue for a packed field.  */
5011 };
5012
5013 /* This type is used for parameters and variables which hold
5014    combinations of the flags in enum cp_lvalue_kind_flags.  */
5015 typedef int cp_lvalue_kind;
5016
5017 /* Various kinds of template specialization, instantiation, etc.  */
5018 enum tmpl_spec_kind {
5019   tsk_none,                /* Not a template at all.  */
5020   tsk_invalid_member_spec, /* An explicit member template
5021                               specialization, but the enclosing
5022                               classes have not all been explicitly
5023                               specialized.  */
5024   tsk_invalid_expl_inst,   /* An explicit instantiation containing
5025                               template parameter lists.  */
5026   tsk_excessive_parms,     /* A template declaration with too many
5027                               template parameter lists.  */
5028   tsk_insufficient_parms,  /* A template declaration with too few
5029                               parameter lists.  */
5030   tsk_template,            /* A template declaration.  */
5031   tsk_expl_spec,           /* An explicit specialization.  */
5032   tsk_expl_inst            /* An explicit instantiation.  */
5033 };
5034
5035 /* The various kinds of access.  BINFO_ACCESS depends on these being
5036    two bit quantities.  The numerical values are important; they are
5037    used to initialize RTTI data structures, so changing them changes
5038    the ABI.  */
5039 enum access_kind {
5040   ak_none = 0,             /* Inaccessible.  */
5041   ak_public = 1,           /* Accessible, as a `public' thing.  */
5042   ak_protected = 2,        /* Accessible, as a `protected' thing.  */
5043   ak_private = 3           /* Accessible, as a `private' thing.  */
5044 };
5045
5046 /* The various kinds of special functions.  If you add to this list,
5047    you should update special_function_p as well.  */
5048 enum special_function_kind {
5049   sfk_none = 0,            /* Not a special function.  This enumeral
5050                               must have value zero; see
5051                               special_function_p.  */
5052   sfk_constructor,         /* A constructor.  */
5053   sfk_copy_constructor,    /* A copy constructor.  */
5054   sfk_move_constructor,    /* A move constructor.  */
5055   sfk_copy_assignment,     /* A copy assignment operator.  */
5056   sfk_move_assignment,     /* A move assignment operator.  */
5057   sfk_destructor,          /* A destructor.  */
5058   sfk_complete_destructor, /* A destructor for complete objects.  */
5059   sfk_base_destructor,     /* A destructor for base subobjects.  */
5060   sfk_deleting_destructor, /* A destructor for complete objects that
5061                               deletes the object after it has been
5062                               destroyed.  */
5063   sfk_conversion,          /* A conversion operator.  */
5064   sfk_deduction_guide,     /* A class template deduction guide.  */
5065   sfk_inheriting_constructor /* An inheriting constructor */
5066 };
5067
5068 /* The various kinds of linkage.  From [basic.link],
5069
5070       A name is said to have linkage when it might denote the same
5071       object, reference, function, type, template, namespace or value
5072       as a name introduced in another scope:
5073
5074       -- When a name has external linkage, the entity it denotes can
5075          be referred to from scopes of other translation units or from
5076          other scopes of the same translation unit.
5077
5078       -- When a name has internal linkage, the entity it denotes can
5079          be referred to by names from other scopes in the same
5080          translation unit.
5081
5082       -- When a name has no linkage, the entity it denotes cannot be
5083          referred to by names from other scopes.  */
5084
5085 enum linkage_kind {
5086   lk_none,                      /* No linkage.  */
5087   lk_internal,                  /* Internal linkage.  */
5088   lk_external                   /* External linkage.  */
5089 };
5090
5091 enum duration_kind {
5092   dk_static,
5093   dk_thread,
5094   dk_auto,
5095   dk_dynamic
5096 };
5097
5098 /* Bitmask flags to control type substitution.  */
5099 enum tsubst_flags {
5100   tf_none = 0,                   /* nothing special */
5101   tf_error = 1 << 0,             /* give error messages  */
5102   tf_warning = 1 << 1,           /* give warnings too  */
5103   tf_ignore_bad_quals = 1 << 2,  /* ignore bad cvr qualifiers */
5104   tf_keep_type_decl = 1 << 3,    /* retain typedef type decls
5105                                     (make_typename_type use) */
5106   tf_ptrmem_ok = 1 << 4,         /* pointers to member ok (internal
5107                                     instantiate_type use) */
5108   tf_user = 1 << 5,              /* found template must be a user template
5109                                     (lookup_template_class use) */
5110   tf_conv = 1 << 6,              /* We are determining what kind of
5111                                     conversion might be permissible,
5112                                     not actually performing the
5113                                     conversion.  */
5114   tf_decltype = 1 << 7,          /* We are the operand of decltype.
5115                                     Used to implement the special rules
5116                                     for calls in decltype (5.2.2/11).  */
5117   tf_partial = 1 << 8,           /* Doing initial explicit argument
5118                                     substitution in fn_type_unification.  */
5119   tf_fndecl_type = 1 << 9,   /* Substituting the type of a function
5120                                 declaration.  */
5121   tf_no_cleanup = 1 << 10,   /* Do not build a cleanup
5122                                 (build_target_expr and friends) */
5123   /* Convenient substitution flags combinations.  */
5124   tf_warning_or_error = tf_warning | tf_error
5125 };
5126
5127 /* This type is used for parameters and variables which hold
5128    combinations of the flags in enum tsubst_flags.  */
5129 typedef int tsubst_flags_t;
5130
5131 /* The kind of checking we can do looking in a class hierarchy.  */
5132 enum base_access_flags {
5133   ba_any = 0,  /* Do not check access, allow an ambiguous base,
5134                       prefer a non-virtual base */
5135   ba_unique = 1 << 0,  /* Must be a unique base.  */
5136   ba_check_bit = 1 << 1,   /* Check access.  */
5137   ba_check = ba_unique | ba_check_bit,
5138   ba_ignore_scope = 1 << 2 /* Ignore access allowed by local scope.  */
5139 };
5140
5141 /* This type is used for parameters and variables which hold
5142    combinations of the flags in enum base_access_flags.  */
5143 typedef int base_access;
5144
5145 /* The various kinds of access check during parsing.  */
5146 enum deferring_kind {
5147   dk_no_deferred = 0, /* Check access immediately */
5148   dk_deferred = 1,    /* Deferred check */
5149   dk_no_check = 2     /* No access check */
5150 };
5151
5152 /* The kind of base we can find, looking in a class hierarchy.
5153    Values <0 indicate we failed.  */
5154 enum base_kind {
5155   bk_inaccessible = -3,   /* The base is inaccessible */
5156   bk_ambig = -2,          /* The base is ambiguous */
5157   bk_not_base = -1,       /* It is not a base */
5158   bk_same_type = 0,       /* It is the same type */
5159   bk_proper_base = 1,     /* It is a proper base */
5160   bk_via_virtual = 2      /* It is a proper base, but via a virtual
5161                              path. This might not be the canonical
5162                              binfo.  */
5163 };
5164
5165 /* Node for "pointer to (virtual) function".
5166    This may be distinct from ptr_type_node so gdb can distinguish them.  */
5167 #define vfunc_ptr_type_node  vtable_entry_type
5168
5169
5170 /* For building calls to `delete'.  */
5171 extern GTY(()) tree integer_two_node;
5172
5173 /* The number of function bodies which we are currently processing.
5174    (Zero if we are at namespace scope, one inside the body of a
5175    function, two inside the body of a function in a local class, etc.)  */
5176 extern int function_depth;
5177
5178 /* Nonzero if we are inside eq_specializations, which affects comparison of
5179    PARM_DECLs in cp_tree_equal.  */
5180 extern int comparing_specializations;
5181
5182 /* In parser.c.  */
5183
5184 /* Nonzero if we are parsing an unevaluated operand: an operand to
5185    sizeof, typeof, or alignof.  This is a count since operands to
5186    sizeof can be nested.  */
5187
5188 extern int cp_unevaluated_operand;
5189
5190 /* RAII class used to inhibit the evaluation of operands during parsing
5191    and template instantiation. Evaluation warnings are also inhibited. */
5192
5193 struct cp_unevaluated
5194 {
5195   cp_unevaluated ();
5196   ~cp_unevaluated ();
5197 };
5198
5199 /* in pt.c  */
5200
5201 /* These values are used for the `STRICT' parameter to type_unification and
5202    fn_type_unification.  Their meanings are described with the
5203    documentation for fn_type_unification.  */
5204
5205 enum unification_kind_t {
5206   DEDUCE_CALL,
5207   DEDUCE_CONV,
5208   DEDUCE_EXACT
5209 };
5210
5211 // An RAII class used to create a new pointer map for local
5212 // specializations. When the stack goes out of scope, the
5213 // previous pointer map is restored.
5214 enum lss_policy { lss_blank, lss_copy };
5215 struct local_specialization_stack
5216 {
5217   local_specialization_stack (lss_policy = lss_blank);
5218   ~local_specialization_stack ();
5219
5220   hash_map<tree, tree> *saved;
5221 };
5222
5223 /* in class.c */
5224
5225 extern int current_class_depth;
5226
5227 /* in decl.c */
5228
5229 /* An array of static vars & fns.  */
5230 extern GTY(()) vec<tree, va_gc> *static_decls;
5231
5232 /* An array of vtable-needing types that have no key function, or have
5233    an emitted key function.  */
5234 extern GTY(()) vec<tree, va_gc> *keyed_classes;
5235 \f
5236 /* Here's where we control how name mangling takes place.  */
5237
5238 /* Cannot use '$' up front, because this confuses gdb
5239    (names beginning with '$' are gdb-local identifiers).
5240
5241    Note that all forms in which the '$' is significant are long enough
5242    for direct indexing (meaning that if we know there is a '$'
5243    at a particular location, we can index into the string at
5244    any other location that provides distinguishing characters).  */
5245
5246 /* Define NO_DOT_IN_LABEL in your favorite tm file if your assembler
5247    doesn't allow '.' in symbol names.  */
5248 #ifndef NO_DOT_IN_LABEL
5249
5250 #define JOINER '.'
5251
5252 #define AUTO_TEMP_NAME "_.tmp_"
5253 #define VFIELD_BASE ".vf"
5254 #define VFIELD_NAME "_vptr."
5255 #define VFIELD_NAME_FORMAT "_vptr.%s"
5256
5257 #else /* NO_DOT_IN_LABEL */
5258
5259 #ifndef NO_DOLLAR_IN_LABEL
5260
5261 #define JOINER '$'
5262
5263 #define AUTO_TEMP_NAME "_$tmp_"
5264 #define VFIELD_BASE "$vf"
5265 #define VFIELD_NAME "_vptr$"
5266 #define VFIELD_NAME_FORMAT "_vptr$%s"
5267
5268 #else /* NO_DOLLAR_IN_LABEL */
5269
5270 #define VTABLE_NAME "__vt_"
5271 #define VTABLE_NAME_P(ID_NODE) \
5272   (!strncmp (IDENTIFIER_POINTER (ID_NODE), VTABLE_NAME, \
5273              sizeof (VTABLE_NAME) - 1))
5274 #define VFIELD_BASE "__vfb"
5275 #define VFIELD_NAME "__vptr_"
5276 #define VFIELD_NAME_P(ID_NODE) \
5277   (!strncmp (IDENTIFIER_POINTER (ID_NODE), VFIELD_NAME, \
5278             sizeof (VFIELD_NAME) - 1))
5279 #define VFIELD_NAME_FORMAT "__vptr_%s"
5280
5281 #endif  /* NO_DOLLAR_IN_LABEL */
5282 #endif  /* NO_DOT_IN_LABEL */
5283
5284 #define LAMBDANAME_PREFIX "__lambda"
5285 #define LAMBDANAME_FORMAT LAMBDANAME_PREFIX "%d"
5286
5287 #define UDLIT_OP_ANSI_PREFIX "operator\"\""
5288 #define UDLIT_OP_ANSI_FORMAT UDLIT_OP_ANSI_PREFIX "%s"
5289 #define UDLIT_OP_MANGLED_PREFIX "li"
5290 #define UDLIT_OP_MANGLED_FORMAT UDLIT_OP_MANGLED_PREFIX "%s"
5291 #define UDLIT_OPER_P(ID_NODE) \
5292   (!strncmp (IDENTIFIER_POINTER (ID_NODE), \
5293              UDLIT_OP_ANSI_PREFIX, \
5294              sizeof (UDLIT_OP_ANSI_PREFIX) - 1))
5295 #define UDLIT_OP_SUFFIX(ID_NODE) \
5296   (IDENTIFIER_POINTER (ID_NODE) + sizeof (UDLIT_OP_ANSI_PREFIX) - 1)
5297
5298 #if !defined(NO_DOLLAR_IN_LABEL) || !defined(NO_DOT_IN_LABEL)
5299
5300 #define VTABLE_NAME_P(ID_NODE) (IDENTIFIER_POINTER (ID_NODE)[1] == 'v' \
5301   && IDENTIFIER_POINTER (ID_NODE)[2] == 't' \
5302   && IDENTIFIER_POINTER (ID_NODE)[3] == JOINER)
5303
5304 #define VFIELD_NAME_P(ID_NODE) \
5305   (!strncmp (IDENTIFIER_POINTER (ID_NODE), VFIELD_NAME, sizeof(VFIELD_NAME)-1))
5306
5307 #endif /* !defined(NO_DOLLAR_IN_LABEL) || !defined(NO_DOT_IN_LABEL) */
5308
5309 \f
5310 /* Nonzero if we're done parsing and into end-of-file activities.
5311    Two if we're done with front-end processing.  */
5312
5313 extern int at_eof;
5314
5315 /* True if note_mangling_alias should enqueue mangling aliases for
5316    later generation, rather than emitting them right away.  */
5317
5318 extern bool defer_mangling_aliases;
5319
5320 /* True if noexcept is part of the type (i.e. in C++17).  */
5321
5322 extern bool flag_noexcept_type;
5323
5324 /* A list of namespace-scope objects which have constructors or
5325    destructors which reside in the global scope.  The decl is stored
5326    in the TREE_VALUE slot and the initializer is stored in the
5327    TREE_PURPOSE slot.  */
5328 extern GTY(()) tree static_aggregates;
5329 /* Likewise, for thread local storage.  */
5330 extern GTY(()) tree tls_aggregates;
5331
5332 enum overload_flags { NO_SPECIAL = 0, DTOR_FLAG, TYPENAME_FLAG };
5333
5334 /* These are uses as bits in flags passed to various functions to
5335    control their behavior.  Despite the LOOKUP_ prefix, many of these
5336    do not control name lookup.  ??? Functions using these flags should
5337    probably be modified to accept explicit boolean flags for the
5338    behaviors relevant to them.  */
5339 /* Check for access violations.  */
5340 #define LOOKUP_PROTECT (1 << 0)
5341 #define LOOKUP_NORMAL (LOOKUP_PROTECT)
5342 /* Even if the function found by lookup is a virtual function, it
5343    should be called directly.  */
5344 #define LOOKUP_NONVIRTUAL (1 << 1)
5345 /* Non-converting (i.e., "explicit") constructors are not tried.  This flag
5346    indicates that we are not performing direct-initialization.  */
5347 #define LOOKUP_ONLYCONVERTING (1 << 2)
5348 #define LOOKUP_IMPLICIT (LOOKUP_NORMAL | LOOKUP_ONLYCONVERTING)
5349 /* If a temporary is created, it should be created so that it lives
5350    as long as the current variable bindings; otherwise it only lives
5351    until the end of the complete-expression.  It also forces
5352    direct-initialization in cases where other parts of the compiler
5353    have already generated a temporary, such as reference
5354    initialization and the catch parameter.  */
5355 #define DIRECT_BIND (1 << 3)
5356 /* We're performing a user-defined conversion, so more user-defined
5357    conversions are not permitted (only built-in conversions).  */
5358 #define LOOKUP_NO_CONVERSION (1 << 4)
5359 /* The user has explicitly called a destructor.  (Therefore, we do
5360    not need to check that the object is non-NULL before calling the
5361    destructor.)  */
5362 #define LOOKUP_DESTRUCTOR (1 << 5)
5363 /* Do not permit references to bind to temporaries.  */
5364 #define LOOKUP_NO_TEMP_BIND (1 << 6)
5365 /* Do not accept objects, and possibly namespaces.  */
5366 #define LOOKUP_PREFER_TYPES (1 << 7)
5367 /* Do not accept objects, and possibly types.   */
5368 #define LOOKUP_PREFER_NAMESPACES (1 << 8)
5369 /* Accept types or namespaces.  */
5370 #define LOOKUP_PREFER_BOTH (LOOKUP_PREFER_TYPES | LOOKUP_PREFER_NAMESPACES)
5371 /* Return friend declarations and un-declared builtin functions.
5372    (Normally, these entities are registered in the symbol table, but
5373    not found by lookup.)  */
5374 #define LOOKUP_HIDDEN (LOOKUP_PREFER_NAMESPACES << 1)
5375 /* We're trying to treat an lvalue as an rvalue.  */
5376 #define LOOKUP_PREFER_RVALUE (LOOKUP_HIDDEN << 1)
5377 /* We're inside an init-list, so narrowing conversions are ill-formed.  */
5378 #define LOOKUP_NO_NARROWING (LOOKUP_PREFER_RVALUE << 1)
5379 /* We're looking up a constructor for list-initialization.  */
5380 #define LOOKUP_LIST_INIT_CTOR (LOOKUP_NO_NARROWING << 1)
5381 /* This is the first parameter of a copy constructor.  */
5382 #define LOOKUP_COPY_PARM (LOOKUP_LIST_INIT_CTOR << 1)
5383 /* We only want to consider list constructors.  */
5384 #define LOOKUP_LIST_ONLY (LOOKUP_COPY_PARM << 1)
5385 /* Return after determining which function to call and checking access.
5386    Used by sythesized_method_walk to determine which functions will
5387    be called to initialize subobjects, in order to determine exception
5388    specification and possible implicit delete.
5389    This is kind of a hack, but exiting early avoids problems with trying
5390    to perform argument conversions when the class isn't complete yet.  */
5391 #define LOOKUP_SPECULATIVE (LOOKUP_LIST_ONLY << 1)
5392 /* Used by calls from defaulted functions to limit the overload set to avoid
5393    cycles trying to declare them (core issue 1092).  */
5394 #define LOOKUP_DEFAULTED (LOOKUP_SPECULATIVE << 1)
5395 /* Used in calls to store_init_value to suppress its usual call to
5396    digest_init.  */
5397 #define LOOKUP_ALREADY_DIGESTED (LOOKUP_DEFAULTED << 1)
5398 /* An instantiation with explicit template arguments.  */
5399 #define LOOKUP_EXPLICIT_TMPL_ARGS (LOOKUP_ALREADY_DIGESTED << 1)
5400 /* Like LOOKUP_NO_TEMP_BIND, but also prevent binding to xvalues.  */
5401 #define LOOKUP_NO_RVAL_BIND (LOOKUP_EXPLICIT_TMPL_ARGS << 1)
5402 /* Used by case_conversion to disregard non-integral conversions.  */
5403 #define LOOKUP_NO_NON_INTEGRAL (LOOKUP_NO_RVAL_BIND << 1)
5404 /* Used for delegating constructors in order to diagnose self-delegation.  */
5405 #define LOOKUP_DELEGATING_CONS (LOOKUP_NO_NON_INTEGRAL << 1)
5406
5407 #define LOOKUP_NAMESPACES_ONLY(F)  \
5408   (((F) & LOOKUP_PREFER_NAMESPACES) && !((F) & LOOKUP_PREFER_TYPES))
5409 #define LOOKUP_TYPES_ONLY(F)  \
5410   (!((F) & LOOKUP_PREFER_NAMESPACES) && ((F) & LOOKUP_PREFER_TYPES))
5411 #define LOOKUP_QUALIFIERS_ONLY(F)     ((F) & LOOKUP_PREFER_BOTH)
5412
5413
5414 /* These flags are used by the conversion code.
5415    CONV_IMPLICIT   :  Perform implicit conversions (standard and user-defined).
5416    CONV_STATIC     :  Perform the explicit conversions for static_cast.
5417    CONV_CONST      :  Perform the explicit conversions for const_cast.
5418    CONV_REINTERPRET:  Perform the explicit conversions for reinterpret_cast.
5419    CONV_PRIVATE    :  Perform upcasts to private bases.
5420    CONV_FORCE_TEMP :  Require a new temporary when converting to the same
5421                       aggregate type.  */
5422
5423 #define CONV_IMPLICIT    1
5424 #define CONV_STATIC      2
5425 #define CONV_CONST       4
5426 #define CONV_REINTERPRET 8
5427 #define CONV_PRIVATE     16
5428 /* #define CONV_NONCONVERTING 32 */
5429 #define CONV_FORCE_TEMP  64
5430 #define CONV_FOLD        128
5431 #define CONV_OLD_CONVERT (CONV_IMPLICIT | CONV_STATIC | CONV_CONST \
5432                           | CONV_REINTERPRET)
5433 #define CONV_C_CAST      (CONV_IMPLICIT | CONV_STATIC | CONV_CONST \
5434                           | CONV_REINTERPRET | CONV_PRIVATE | CONV_FORCE_TEMP)
5435 #define CONV_BACKEND_CONVERT (CONV_OLD_CONVERT | CONV_FOLD)
5436
5437 /* Used by build_expr_type_conversion to indicate which types are
5438    acceptable as arguments to the expression under consideration.  */
5439
5440 #define WANT_INT        1 /* integer types, including bool */
5441 #define WANT_FLOAT      2 /* floating point types */
5442 #define WANT_ENUM       4 /* enumerated types */
5443 #define WANT_POINTER    8 /* pointer types */
5444 #define WANT_NULL      16 /* null pointer constant */
5445 #define WANT_VECTOR_OR_COMPLEX 32 /* vector or complex types */
5446 #define WANT_ARITH      (WANT_INT | WANT_FLOAT | WANT_VECTOR_OR_COMPLEX)
5447
5448 /* Used with comptypes, and related functions, to guide type
5449    comparison.  */
5450
5451 #define COMPARE_STRICT        0 /* Just check if the types are the
5452                                    same.  */
5453 #define COMPARE_BASE          1 /* Check to see if the second type is
5454                                    derived from the first.  */
5455 #define COMPARE_DERIVED       2 /* Like COMPARE_BASE, but in
5456                                    reverse.  */
5457 #define COMPARE_REDECLARATION 4 /* The comparison is being done when
5458                                    another declaration of an existing
5459                                    entity is seen.  */
5460 #define COMPARE_STRUCTURAL    8 /* The comparison is intended to be
5461                                    structural. The actual comparison
5462                                    will be identical to
5463                                    COMPARE_STRICT.  */
5464
5465 /* Used with start function.  */
5466 #define SF_DEFAULT           0  /* No flags.  */
5467 #define SF_PRE_PARSED        1  /* The function declaration has
5468                                    already been parsed.  */
5469 #define SF_INCLASS_INLINE    2  /* The function is an inline, defined
5470                                    in the class body.  */
5471
5472 /* Used with start_decl's initialized parameter.  */
5473 #define SD_UNINITIALIZED     0
5474 #define SD_INITIALIZED       1
5475 #define SD_DEFAULTED         2
5476 #define SD_DELETED           3
5477
5478 /* Returns nonzero iff TYPE1 and TYPE2 are the same type, or if TYPE2
5479    is derived from TYPE1, or if TYPE2 is a pointer (reference) to a
5480    class derived from the type pointed to (referred to) by TYPE1.  */
5481 #define same_or_base_type_p(TYPE1, TYPE2) \
5482   comptypes ((TYPE1), (TYPE2), COMPARE_BASE)
5483
5484 /* These macros are used to access a TEMPLATE_PARM_INDEX.  */
5485 #define TEMPLATE_PARM_INDEX_CAST(NODE) \
5486         ((template_parm_index*)TEMPLATE_PARM_INDEX_CHECK (NODE))
5487 #define TEMPLATE_PARM_IDX(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->index)
5488 #define TEMPLATE_PARM_LEVEL(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->level)
5489 #define TEMPLATE_PARM_DESCENDANTS(NODE) (TREE_CHAIN (NODE))
5490 #define TEMPLATE_PARM_ORIG_LEVEL(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->orig_level)
5491 #define TEMPLATE_PARM_DECL(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->decl)
5492 #define TEMPLATE_PARM_PARAMETER_PACK(NODE) \
5493   (TREE_LANG_FLAG_0 (TEMPLATE_PARM_INDEX_CHECK (NODE)))
5494
5495 /* These macros are for accessing the fields of TEMPLATE_TYPE_PARM,
5496    TEMPLATE_TEMPLATE_PARM and BOUND_TEMPLATE_TEMPLATE_PARM nodes.  */
5497 #define TEMPLATE_TYPE_PARM_INDEX(NODE)                                  \
5498   (TYPE_VALUES_RAW (TREE_CHECK3 ((NODE), TEMPLATE_TYPE_PARM,            \
5499                                  TEMPLATE_TEMPLATE_PARM,                \
5500                                  BOUND_TEMPLATE_TEMPLATE_PARM)))
5501 #define TEMPLATE_TYPE_IDX(NODE) \
5502   (TEMPLATE_PARM_IDX (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5503 #define TEMPLATE_TYPE_LEVEL(NODE) \
5504   (TEMPLATE_PARM_LEVEL (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5505 #define TEMPLATE_TYPE_ORIG_LEVEL(NODE) \
5506   (TEMPLATE_PARM_ORIG_LEVEL (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5507 #define TEMPLATE_TYPE_DECL(NODE) \
5508   (TEMPLATE_PARM_DECL (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5509 #define TEMPLATE_TYPE_PARAMETER_PACK(NODE) \
5510   (TEMPLATE_PARM_PARAMETER_PACK (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5511
5512 /* For a C++17 class deduction placeholder, the template it represents.  */
5513 #define CLASS_PLACEHOLDER_TEMPLATE(NODE) \
5514   (DECL_INITIAL (TYPE_NAME (TEMPLATE_TYPE_PARM_CHECK (NODE))))
5515
5516 /* Contexts in which auto deduction occurs. These flags are
5517    used to control diagnostics in do_auto_deduction.  */
5518
5519 enum auto_deduction_context
5520 {
5521   adc_unspecified,   /* Not given */
5522   adc_variable_type, /* Variable initializer deduction */
5523   adc_return_type,   /* Return type deduction */
5524   adc_unify,         /* Template argument deduction */
5525   adc_requirement,   /* Argument deduction constraint */
5526   adc_decomp_type    /* Decomposition declaration initializer deduction */
5527 };
5528
5529 /* True if this type-parameter belongs to a class template, used by C++17
5530    class template argument deduction.  */
5531 #define TEMPLATE_TYPE_PARM_FOR_CLASS(NODE) \
5532   (TREE_LANG_FLAG_0 (TEMPLATE_TYPE_PARM_CHECK (NODE)))
5533
5534 /* True iff this TEMPLATE_TYPE_PARM represents decltype(auto).  */
5535 #define AUTO_IS_DECLTYPE(NODE) \
5536   (TYPE_LANG_FLAG_5 (TEMPLATE_TYPE_PARM_CHECK (NODE)))
5537
5538 /* These constants can used as bit flags in the process of tree formatting.
5539
5540    TFF_PLAIN_IDENTIFIER: unqualified part of a name.
5541    TFF_SCOPE: include the class and namespace scope of the name.
5542    TFF_CHASE_TYPEDEF: print the original type-id instead of the typedef-name.
5543    TFF_DECL_SPECIFIERS: print decl-specifiers.
5544    TFF_CLASS_KEY_OR_ENUM: precede a class-type name (resp. enum name) with
5545        a class-key (resp. `enum').
5546    TFF_RETURN_TYPE: include function return type.
5547    TFF_FUNCTION_DEFAULT_ARGUMENTS: include function default parameter values.
5548    TFF_EXCEPTION_SPECIFICATION: show function exception specification.
5549    TFF_TEMPLATE_HEADER: show the template<...> header in a
5550        template-declaration.
5551    TFF_TEMPLATE_NAME: show only template-name.
5552    TFF_EXPR_IN_PARENS: parenthesize expressions.
5553    TFF_NO_FUNCTION_ARGUMENTS: don't show function arguments.
5554    TFF_UNQUALIFIED_NAME: do not print the qualifying scope of the
5555        top-level entity.
5556    TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS: do not omit template arguments
5557        identical to their defaults.
5558    TFF_NO_TEMPLATE_BINDINGS: do not print information about the template
5559        arguments for a function template specialization.
5560    TFF_POINTER: we are printing a pointer type.  */
5561
5562 #define TFF_PLAIN_IDENTIFIER                    (0)
5563 #define TFF_SCOPE                               (1)
5564 #define TFF_CHASE_TYPEDEF                       (1 << 1)
5565 #define TFF_DECL_SPECIFIERS                     (1 << 2)
5566 #define TFF_CLASS_KEY_OR_ENUM                   (1 << 3)
5567 #define TFF_RETURN_TYPE                         (1 << 4)
5568 #define TFF_FUNCTION_DEFAULT_ARGUMENTS          (1 << 5)
5569 #define TFF_EXCEPTION_SPECIFICATION             (1 << 6)
5570 #define TFF_TEMPLATE_HEADER                     (1 << 7)
5571 #define TFF_TEMPLATE_NAME                       (1 << 8)
5572 #define TFF_EXPR_IN_PARENS                      (1 << 9)
5573 #define TFF_NO_FUNCTION_ARGUMENTS               (1 << 10)
5574 #define TFF_UNQUALIFIED_NAME                    (1 << 11)
5575 #define TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS  (1 << 12)
5576 #define TFF_NO_TEMPLATE_BINDINGS                (1 << 13)
5577 #define TFF_POINTER                             (1 << 14)
5578
5579 /* Returns the TEMPLATE_DECL associated to a TEMPLATE_TEMPLATE_PARM
5580    node.  */
5581 #define TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL(NODE)      \
5582   ((TREE_CODE (NODE) == BOUND_TEMPLATE_TEMPLATE_PARM)   \
5583    ? TYPE_TI_TEMPLATE (NODE)                            \
5584    : TYPE_NAME (NODE))
5585
5586 /* in lex.c  */
5587
5588 extern void init_reswords (void);
5589
5590 /* Various flags for the overloaded operator information.  */
5591 enum ovl_op_flags
5592   {
5593     OVL_OP_FLAG_NONE = 0,       /* Don't care.  */
5594     OVL_OP_FLAG_UNARY = 1,      /* Is unary.  */
5595     OVL_OP_FLAG_BINARY = 2,     /* Is binary.  */
5596     OVL_OP_FLAG_AMBIARY = 3,    /* May be unary or binary.  */
5597     OVL_OP_FLAG_ALLOC = 4,      /* operator new or delete.  */
5598     OVL_OP_FLAG_DELETE = 1,     /* operator delete.  */
5599     OVL_OP_FLAG_VEC = 2         /* vector new or delete.  */
5600   };
5601
5602 /* Compressed operator codes.  Order is determined by operators.def
5603    and does not match that of tree_codes.  */
5604 enum ovl_op_code
5605   {
5606     OVL_OP_ERROR_MARK,
5607     OVL_OP_NOP_EXPR,
5608 #define DEF_OPERATOR(NAME, CODE, MANGLING, FLAGS) OVL_OP_##CODE,
5609 #define DEF_ASSN_OPERATOR(NAME, CODE, MANGLING) /* NOTHING */
5610 #include "operators.def"
5611     OVL_OP_MAX
5612   };
5613
5614 struct GTY(()) ovl_op_info_t {
5615   /* The IDENTIFIER_NODE for the operator.  */
5616   tree identifier;
5617   /* The name of the operator.  */
5618   const char *name;
5619   /* The mangled name of the operator.  */
5620   const char *mangled_name;
5621   /* The (regular) tree code.  */
5622   enum tree_code tree_code : 16;
5623   /* The (compressed) operator code.  */
5624   enum ovl_op_code ovl_op_code : 8;
5625   /* The ovl_op_flags of the operator */
5626   unsigned flags : 8;
5627 };
5628
5629 /* Overloaded operator info indexed by ass_op_p & ovl_op_code.  */
5630 extern GTY(()) ovl_op_info_t ovl_op_info[2][OVL_OP_MAX];
5631 /* Mapping from tree_codes to ovl_op_codes.  */
5632 extern GTY(()) unsigned char ovl_op_mapping[MAX_TREE_CODES];
5633 /* Mapping for ambi-ary operators from the binary to the unary.  */
5634 extern GTY(()) unsigned char ovl_op_alternate[OVL_OP_MAX];
5635
5636 /* Given an ass_op_p boolean and a tree code, return a pointer to its
5637    overloaded operator info.  Tree codes for non-overloaded operators
5638    map to the error-operator.  */
5639 #define OVL_OP_INFO(IS_ASS_P, TREE_CODE)                        \
5640   (&ovl_op_info[(IS_ASS_P) != 0][ovl_op_mapping[(TREE_CODE)]])
5641 /* Overloaded operator info for an identifier for which
5642    IDENTIFIER_OVL_OP_P is true.  */
5643 #define IDENTIFIER_OVL_OP_INFO(NODE) \
5644   (&ovl_op_info[IDENTIFIER_KIND_BIT_0 (NODE)][IDENTIFIER_CP_INDEX (NODE)])
5645 #define IDENTIFIER_OVL_OP_FLAGS(NODE) \
5646   (IDENTIFIER_OVL_OP_INFO (NODE)->flags)
5647
5648 /* A type-qualifier, or bitmask therefore, using the TYPE_QUAL
5649    constants.  */
5650
5651 typedef int cp_cv_quals;
5652
5653 /* Non-static member functions have an optional virt-specifier-seq.
5654    There is a VIRT_SPEC value for each virt-specifier.
5655    They can be combined by bitwise-or to form the complete set of
5656    virt-specifiers for a member function.  */
5657 enum virt_specifier
5658   {
5659     VIRT_SPEC_UNSPECIFIED = 0x0,
5660     VIRT_SPEC_FINAL       = 0x1,
5661     VIRT_SPEC_OVERRIDE    = 0x2
5662   };
5663
5664 /* A type-qualifier, or bitmask therefore, using the VIRT_SPEC
5665    constants.  */
5666
5667 typedef int cp_virt_specifiers;
5668
5669 /* Wherever there is a function-cv-qual, there could also be a ref-qualifier:
5670
5671    [dcl.fct]
5672    The return type, the parameter-type-list, the ref-qualifier, and
5673    the cv-qualifier-seq, but not the default arguments or the exception
5674    specification, are part of the function type.
5675
5676    REF_QUAL_NONE    Ordinary member function with no ref-qualifier
5677    REF_QUAL_LVALUE  Member function with the &-ref-qualifier
5678    REF_QUAL_RVALUE  Member function with the &&-ref-qualifier */
5679
5680 enum cp_ref_qualifier {
5681   REF_QUAL_NONE = 0,
5682   REF_QUAL_LVALUE = 1,
5683   REF_QUAL_RVALUE = 2
5684 };
5685
5686 /* A storage class.  */
5687
5688 enum cp_storage_class {
5689   /* sc_none must be zero so that zeroing a cp_decl_specifier_seq
5690      sets the storage_class field to sc_none.  */
5691   sc_none = 0,
5692   sc_auto,
5693   sc_register,
5694   sc_static,
5695   sc_extern,
5696   sc_mutable
5697 };
5698
5699 /* An individual decl-specifier.  This is used to index the array of
5700    locations for the declspecs in struct cp_decl_specifier_seq
5701    below.  */
5702
5703 enum cp_decl_spec {
5704   ds_first,
5705   ds_signed = ds_first,
5706   ds_unsigned,
5707   ds_short,
5708   ds_long,
5709   ds_const,
5710   ds_volatile,
5711   ds_restrict,
5712   ds_inline,
5713   ds_virtual,
5714   ds_explicit,
5715   ds_friend,
5716   ds_typedef,
5717   ds_alias,
5718   ds_constexpr,
5719   ds_complex,
5720   ds_thread,
5721   ds_type_spec,
5722   ds_redefined_builtin_type_spec,
5723   ds_attribute,
5724   ds_std_attribute,
5725   ds_storage_class,
5726   ds_long_long,
5727   ds_concept,
5728   ds_last /* This enumerator must always be the last one.  */
5729 };
5730
5731 /* A decl-specifier-seq.  */
5732
5733 struct cp_decl_specifier_seq {
5734   /* An array of locations for the declaration sepecifiers, indexed by
5735      enum cp_decl_spec_word.  */
5736   source_location locations[ds_last];
5737   /* The primary type, if any, given by the decl-specifier-seq.
5738      Modifiers, like "short", "const", and "unsigned" are not
5739      reflected here.  This field will be a TYPE, unless a typedef-name
5740      was used, in which case it will be a TYPE_DECL.  */
5741   tree type;
5742   /* The attributes, if any, provided with the specifier sequence.  */
5743   tree attributes;
5744   /* The c++11 attributes that follows the type specifier.  */
5745   tree std_attributes;
5746   /* If non-NULL, a built-in type that the user attempted to redefine
5747      to some other type.  */
5748   tree redefined_builtin_type;
5749   /* The explicit-specifier, if any.  */
5750   tree explicit_specifier;
5751   /* The storage class specified -- or sc_none if no storage class was
5752      explicitly specified.  */
5753   cp_storage_class storage_class;
5754   /* For the __intN declspec, this stores the index into the int_n_* arrays.  */
5755   int int_n_idx;
5756   /* True iff TYPE_SPEC defines a class or enum.  */
5757   BOOL_BITFIELD type_definition_p : 1;
5758   /* True iff multiple types were (erroneously) specified for this
5759      decl-specifier-seq.  */
5760   BOOL_BITFIELD multiple_types_p : 1;
5761   /* True iff multiple storage classes were (erroneously) specified
5762      for this decl-specifier-seq or a combination of a storage class
5763      with a typedef specifier.  */
5764   BOOL_BITFIELD conflicting_specifiers_p : 1;
5765   /* True iff at least one decl-specifier was found.  */
5766   BOOL_BITFIELD any_specifiers_p : 1;
5767   /* True iff at least one type-specifier was found.  */
5768   BOOL_BITFIELD any_type_specifiers_p : 1;
5769   /* True iff "int" was explicitly provided.  */
5770   BOOL_BITFIELD explicit_int_p : 1;
5771   /* True iff "__intN" was explicitly provided.  */
5772   BOOL_BITFIELD explicit_intN_p : 1;
5773   /* True iff "char" was explicitly provided.  */
5774   BOOL_BITFIELD explicit_char_p : 1;
5775   /* True iff ds_thread is set for __thread, not thread_local.  */
5776   BOOL_BITFIELD gnu_thread_keyword_p : 1;
5777   /* True iff the type is a decltype.  */
5778   BOOL_BITFIELD decltype_p : 1;
5779 };
5780
5781 /* The various kinds of declarators.  */
5782
5783 enum cp_declarator_kind {
5784   cdk_id,
5785   cdk_function,
5786   cdk_array,
5787   cdk_pointer,
5788   cdk_reference,
5789   cdk_ptrmem,
5790   cdk_decomp,
5791   cdk_error
5792 };
5793
5794 /* A declarator.  */
5795
5796 typedef struct cp_declarator cp_declarator;
5797
5798 typedef struct cp_parameter_declarator cp_parameter_declarator;
5799
5800 /* A parameter, before it has been semantically analyzed.  */
5801 struct cp_parameter_declarator {
5802   /* The next parameter, or NULL_TREE if none.  */
5803   cp_parameter_declarator *next;
5804   /* The decl-specifiers-seq for the parameter.  */
5805   cp_decl_specifier_seq decl_specifiers;
5806   /* The declarator for the parameter.  */
5807   cp_declarator *declarator;
5808   /* The default-argument expression, or NULL_TREE, if none.  */
5809   tree default_argument;
5810   /* True iff this is a template parameter pack.  */
5811   bool template_parameter_pack_p;
5812   /* Location within source.  */
5813   location_t loc;
5814 };
5815
5816 /* A declarator.  */
5817 struct cp_declarator {
5818   /* The kind of declarator.  */
5819   ENUM_BITFIELD (cp_declarator_kind) kind : 4;
5820   /* Whether we parsed an ellipsis (`...') just before the declarator,
5821      to indicate this is a parameter pack.  */
5822   BOOL_BITFIELD parameter_pack_p : 1;
5823   /* If this declarator is parenthesized, this the open-paren.  It is
5824      UNKNOWN_LOCATION when not parenthesized.  */
5825   location_t parenthesized;
5826
5827   location_t id_loc; /* Currently only set for cdk_id, cdk_decomp and
5828                         cdk_function. */
5829   /* GNU Attributes that apply to this declarator.  If the declarator
5830      is a pointer or a reference, these attribute apply to the type
5831      pointed to.  */
5832   tree attributes;
5833   /* Standard C++11 attributes that apply to this declarator.  If the
5834      declarator is a pointer or a reference, these attributes apply
5835      to the pointer, rather than to the type pointed to.  */
5836   tree std_attributes;
5837   /* For all but cdk_id, cdk_decomp and cdk_error, the contained declarator.
5838      For cdk_id, cdk_decomp and cdk_error, guaranteed to be NULL.  */
5839   cp_declarator *declarator;
5840   union {
5841     /* For identifiers.  */
5842     struct {
5843       /* If non-NULL, the qualifying scope (a NAMESPACE_DECL or
5844          *_TYPE) for this identifier.  */
5845       tree qualifying_scope;
5846       /* The unqualified name of the entity -- an IDENTIFIER_NODE,
5847          BIT_NOT_EXPR, or TEMPLATE_ID_EXPR.  */
5848       tree unqualified_name;
5849       /* If this is the name of a function, what kind of special
5850          function (if any).  */
5851       special_function_kind sfk;
5852     } id;
5853     /* For functions.  */
5854     struct {
5855       /* The parameters to the function as a TREE_LIST of decl/default.  */
5856       tree parameters;
5857       /* The cv-qualifiers for the function.  */
5858       cp_cv_quals qualifiers;
5859       /* The virt-specifiers for the function.  */
5860       cp_virt_specifiers virt_specifiers;
5861       /* The ref-qualifier for the function.  */
5862       cp_ref_qualifier ref_qualifier;
5863       /* The transaction-safety qualifier for the function.  */
5864       tree tx_qualifier;
5865       /* The exception-specification for the function.  */
5866       tree exception_specification;
5867       /* The late-specified return type, if any.  */
5868       tree late_return_type;
5869       /* The trailing requires-clause, if any. */
5870       tree requires_clause;
5871     } function;
5872     /* For arrays.  */
5873     struct {
5874       /* The bounds to the array.  */
5875       tree bounds;
5876     } array;
5877     /* For cdk_pointer and cdk_ptrmem.  */
5878     struct {
5879       /* The cv-qualifiers for the pointer.  */
5880       cp_cv_quals qualifiers;
5881       /* For cdk_ptrmem, the class type containing the member.  */
5882       tree class_type;
5883     } pointer;
5884     /* For cdk_reference */
5885     struct {
5886       /* The cv-qualifiers for the reference.  These qualifiers are
5887          only used to diagnose ill-formed code.  */
5888       cp_cv_quals qualifiers;
5889       /* Whether this is an rvalue reference */
5890       bool rvalue_ref;
5891     } reference;
5892   } u;
5893 };
5894
5895 /* A level of template instantiation.  */
5896 struct GTY((chain_next ("%h.next"))) tinst_level {
5897   /* The immediately deeper level in the chain.  */
5898   struct tinst_level *next;
5899
5900   /* The original node.  TLDCL can be a DECL (for a function or static
5901      data member), a TYPE (for a class), depending on what we were
5902      asked to instantiate, or a TREE_LIST with the template as PURPOSE
5903      and the template args as VALUE, if we are substituting for
5904      overload resolution.  In all these cases, TARGS is NULL.
5905      However, to avoid creating TREE_LIST objects for substitutions if
5906      we can help, we store PURPOSE and VALUE in TLDCL and TARGS,
5907      respectively.  So TLDCL stands for TREE_LIST or DECL (the
5908      template is a DECL too), whereas TARGS stands for the template
5909      arguments.  */
5910   tree tldcl, targs;
5911
5912  private:
5913   /* Return TRUE iff the original node is a split list.  */
5914   bool split_list_p () const { return targs; }
5915
5916   /* Return TRUE iff the original node is a TREE_LIST object.  */
5917   bool tree_list_p () const
5918   {
5919     return !split_list_p () && TREE_CODE (tldcl) == TREE_LIST;
5920   }
5921
5922   /* Return TRUE iff the original node is not a list, split or not.  */
5923   bool not_list_p () const
5924   {
5925     return !split_list_p () && !tree_list_p ();
5926   }
5927
5928   /* Convert (in place) the original node from a split list to a
5929      TREE_LIST.  */
5930   tree to_list ();
5931
5932  public:
5933   /* Release storage for OBJ and node, if it's a TREE_LIST.  */
5934   static void free (tinst_level *obj);
5935
5936   /* Return TRUE iff the original node is a list, split or not.  */
5937   bool list_p () const { return !not_list_p (); }
5938
5939   /* Return the original node; if it's a split list, make it a
5940      TREE_LIST first, so that it can be returned as a single tree
5941      object.  */
5942   tree get_node () {
5943     if (!split_list_p ()) return tldcl;
5944     else return to_list ();
5945   }
5946
5947   /* Return the original node if it's a DECL or a TREE_LIST, but do
5948      NOT convert a split list to a TREE_LIST: return NULL instead.  */
5949   tree maybe_get_node () const {
5950     if (!split_list_p ()) return tldcl;
5951     else return NULL_TREE;
5952   }
5953
5954   /* The location where the template is instantiated.  */
5955   location_t locus;
5956
5957   /* errorcount + sorrycount when we pushed this level.  */
5958   unsigned short errors;
5959
5960   /* Count references to this object.  If refcount reaches
5961      refcount_infinity value, we don't increment or decrement the
5962      refcount anymore, as the refcount isn't accurate anymore.
5963      The object can be still garbage collected if unreferenced from
5964      anywhere, which might keep referenced objects referenced longer than
5965      otherwise necessary.  Hitting the infinity is rare though.  */
5966   unsigned short refcount;
5967
5968   /* Infinity value for the above refcount.  */
5969   static const unsigned short refcount_infinity = (unsigned short) ~0;
5970 };
5971
5972 /* BUILT_IN_FRONTEND function codes.  */
5973 enum cp_built_in_function {
5974   CP_BUILT_IN_IS_CONSTANT_EVALUATED,
5975   CP_BUILT_IN_INTEGER_PACK,
5976   CP_BUILT_IN_LAST
5977 };
5978
5979 bool decl_spec_seq_has_spec_p (const cp_decl_specifier_seq *, cp_decl_spec);
5980
5981 /* Return the type of the `this' parameter of FNTYPE.  */
5982
5983 inline tree
5984 type_of_this_parm (const_tree fntype)
5985 {
5986   function_args_iterator iter;
5987   gcc_assert (TREE_CODE (fntype) == METHOD_TYPE);
5988   function_args_iter_init (&iter, fntype);
5989   return function_args_iter_cond (&iter);
5990 }
5991
5992 /* Return the class of the `this' parameter of FNTYPE.  */
5993
5994 inline tree
5995 class_of_this_parm (const_tree fntype)
5996 {
5997   return TREE_TYPE (type_of_this_parm (fntype));
5998 }
5999
6000 /* True iff T is a variable template declaration. */
6001 inline bool
6002 variable_template_p (tree t)
6003 {
6004   if (TREE_CODE (t) != TEMPLATE_DECL)
6005     return false;
6006   if (!PRIMARY_TEMPLATE_P (t))
6007     return false;
6008   if (tree r = DECL_TEMPLATE_RESULT (t))
6009     return VAR_P (r);
6010   return false;
6011 }
6012
6013 /* True iff T is a variable concept definition. That is, T is
6014    a variable template declared with the concept specifier. */
6015 inline bool
6016 variable_concept_p (tree t)
6017 {
6018   if (TREE_CODE (t) != TEMPLATE_DECL)
6019     return false;
6020   if (tree r = DECL_TEMPLATE_RESULT (t))
6021     return VAR_P (r) && DECL_DECLARED_CONCEPT_P (r);
6022   return false;
6023 }
6024
6025 /* True iff T is a concept definition. That is, T is a variable or function
6026    template declared with the concept specifier. */
6027 inline bool
6028 concept_template_p (tree t)
6029 {
6030   if (TREE_CODE (t) != TEMPLATE_DECL)
6031     return false;
6032   if (tree r = DECL_TEMPLATE_RESULT (t))
6033     return VAR_OR_FUNCTION_DECL_P (r) && DECL_DECLARED_CONCEPT_P (r);
6034   return false;
6035 }
6036
6037 /* A parameter list indicating for a function with no parameters,
6038    e.g  "int f(void)".  */
6039 extern cp_parameter_declarator *no_parameters;
6040
6041 /* Various dump ids.  */
6042 extern int class_dump_id;
6043 extern int raw_dump_id;
6044
6045 /* in call.c */
6046 extern bool check_dtor_name                     (tree, tree);
6047 int magic_varargs_p                             (tree);
6048
6049 extern tree build_conditional_expr              (location_t, tree, tree, tree,
6050                                                  tsubst_flags_t);
6051 extern tree build_addr_func                     (tree, tsubst_flags_t);
6052 extern void set_flags_from_callee               (tree);
6053 extern tree build_call_a                        (tree, int, tree*);
6054 extern tree build_call_n                        (tree, int, ...);
6055 extern bool null_ptr_cst_p                      (tree);
6056 extern bool null_member_pointer_value_p         (tree);
6057 extern bool sufficient_parms_p                  (const_tree);
6058 extern tree type_decays_to                      (tree);
6059 extern tree extract_call_expr                   (tree);
6060 extern tree build_trivial_dtor_call             (tree);
6061 extern tree build_user_type_conversion          (tree, tree, int,
6062                                                  tsubst_flags_t);
6063 extern tree build_new_function_call             (tree, vec<tree, va_gc> **,
6064                                                  tsubst_flags_t);
6065 extern tree build_operator_new_call             (tree, vec<tree, va_gc> **,
6066                                                  tree *, tree *, tree, tree,
6067                                                  tree *, tsubst_flags_t);
6068 extern tree build_new_method_call               (tree, tree,
6069                                                  vec<tree, va_gc> **, tree,
6070                                                  int, tree *, tsubst_flags_t);
6071 extern tree build_special_member_call           (tree, tree,
6072                                                  vec<tree, va_gc> **,
6073                                                  tree, int, tsubst_flags_t);
6074 extern tree build_new_op                        (location_t, enum tree_code,
6075                                                  int, tree, tree, tree, tree *,
6076                                                  tsubst_flags_t);
6077 extern tree build_op_call                       (tree, vec<tree, va_gc> **,
6078                                                  tsubst_flags_t);
6079 extern bool aligned_allocation_fn_p             (tree);
6080 extern bool usual_deallocation_fn_p             (tree);
6081 extern tree build_op_delete_call                (enum tree_code, tree, tree,
6082                                                  bool, tree, tree,
6083                                                  tsubst_flags_t);
6084 extern bool can_convert                         (tree, tree, tsubst_flags_t);
6085 extern bool can_convert_standard                (tree, tree, tsubst_flags_t);
6086 extern bool can_convert_arg                     (tree, tree, tree, int,
6087                                                  tsubst_flags_t);
6088 extern bool can_convert_arg_bad                 (tree, tree, tree, int,
6089                                                  tsubst_flags_t);
6090 extern int conv_flags                           (int, int, tree, tree, int);
6091 extern struct conversion * good_conversion      (tree, tree, tree, int, tsubst_flags_t);
6092 extern location_t get_fndecl_argument_location  (tree, int);
6093 extern void complain_about_bad_argument (location_t arg_loc,
6094                                                  tree from_type, tree to_type,
6095                                                  tree fndecl, int parmnum);
6096
6097
6098 /* A class for recording information about access failures (e.g. private
6099    fields), so that we can potentially supply a fix-it hint about
6100    an accessor (from a context in which the constness of the object
6101    is known).  */
6102
6103 class access_failure_info
6104 {
6105  public:
6106   access_failure_info () : m_was_inaccessible (false),
6107     m_basetype_path (NULL_TREE),
6108     m_decl (NULL_TREE), m_diag_decl (NULL_TREE) {}
6109
6110   void record_access_failure (tree basetype_path, tree decl, tree diag_decl);
6111
6112   bool was_inaccessible_p () const { return m_was_inaccessible; }
6113   tree get_decl () const { return m_decl; }
6114   tree get_diag_decl () const { return m_diag_decl; }
6115   tree get_any_accessor (bool const_p) const;
6116   void maybe_suggest_accessor (bool const_p) const;
6117   static void add_fixit_hint (rich_location *richloc, tree accessor);
6118
6119  private:
6120   bool m_was_inaccessible;
6121   tree m_basetype_path;
6122   tree m_decl;
6123   tree m_diag_decl;
6124 };
6125
6126 extern void complain_about_access               (tree, tree, bool);
6127 extern bool enforce_access                      (tree, tree, tree,
6128                                                  tsubst_flags_t,
6129                                                  access_failure_info *afi = NULL);
6130 extern void push_defarg_context                 (tree);
6131 extern void pop_defarg_context                  (void);
6132 extern tree convert_default_arg                 (tree, tree, tree, int,
6133                                                  tsubst_flags_t);
6134 extern tree convert_arg_to_ellipsis             (tree, tsubst_flags_t);
6135 extern tree build_x_va_arg                      (source_location, tree, tree);
6136 extern tree cxx_type_promotes_to                (tree);
6137 extern tree type_passed_as                      (tree);
6138 extern tree convert_for_arg_passing             (tree, tree, tsubst_flags_t);
6139 extern bool is_properly_derived_from            (tree, tree);
6140 extern tree initialize_reference                (tree, tree, int,
6141                                                  tsubst_flags_t);
6142 extern tree extend_ref_init_temps               (tree, tree, vec<tree, va_gc>**);
6143 extern tree make_temporary_var_for_ref_to_temp  (tree, tree);
6144 extern bool type_has_extended_temps             (tree);
6145 extern tree strip_top_quals                     (tree);
6146 extern bool reference_related_p                 (tree, tree);
6147 extern int remaining_arguments                  (tree);
6148 extern tree perform_implicit_conversion         (tree, tree, tsubst_flags_t);
6149 extern tree perform_implicit_conversion_flags   (tree, tree, tsubst_flags_t, int);
6150 extern tree build_converted_constant_expr       (tree, tree, tsubst_flags_t);
6151 extern tree perform_direct_initialization_if_possible (tree, tree, bool,
6152                                                        tsubst_flags_t);
6153 extern tree in_charge_arg_for_name              (tree);
6154 extern tree build_cxx_call                      (tree, int, tree *,
6155                                                  tsubst_flags_t);
6156 extern bool is_std_init_list                    (tree);
6157 extern bool is_list_ctor                        (tree);
6158 extern void validate_conversion_obstack         (void);
6159 extern void mark_versions_used                  (tree);
6160 extern bool cp_warn_deprecated_use              (tree, tsubst_flags_t = tf_warning_or_error);
6161 extern tree get_function_version_dispatcher     (tree);
6162
6163 /* in class.c */
6164 extern tree build_vfield_ref                    (tree, tree);
6165 extern tree build_if_in_charge                  (tree true_stmt, tree false_stmt = void_node);
6166 extern tree build_base_path                     (enum tree_code, tree,
6167                                                  tree, int, tsubst_flags_t);
6168 extern tree convert_to_base                     (tree, tree, bool, bool,
6169                                                  tsubst_flags_t);
6170 extern tree convert_to_base_statically          (tree, tree);
6171 extern tree build_vtbl_ref                      (tree, tree);
6172 extern tree build_vfn_ref                       (tree, tree);
6173 extern tree get_vtable_decl                     (tree, int);
6174 extern bool add_method                          (tree, tree, bool);
6175 extern tree declared_access                     (tree);
6176 extern tree currently_open_class                (tree);
6177 extern tree currently_open_derived_class        (tree);
6178 extern tree outermost_open_class                (void);
6179 extern tree current_nonlambda_class_type        (void);
6180 extern tree finish_struct                       (tree, tree);
6181 extern void finish_struct_1                     (tree);
6182 extern int resolves_to_fixed_type_p             (tree, int *);
6183 extern void init_class_processing               (void);
6184 extern int is_empty_class                       (tree);
6185 extern bool is_really_empty_class               (tree);
6186 extern void pushclass                           (tree);
6187 extern void popclass                            (void);
6188 extern void push_nested_class                   (tree);
6189 extern void pop_nested_class                    (void);
6190 extern int current_lang_depth                   (void);
6191 extern void push_lang_context                   (tree);
6192 extern void pop_lang_context                    (void);
6193 extern tree instantiate_type                    (tree, tree, tsubst_flags_t);
6194 extern void build_self_reference                (void);
6195 extern int same_signature_p                     (const_tree, const_tree);
6196 extern void maybe_add_class_template_decl_list  (tree, tree, int);
6197 extern void unreverse_member_declarations       (tree);
6198 extern void invalidate_class_lookup_cache       (void);
6199 extern void maybe_note_name_used_in_class       (tree, tree);
6200 extern void note_name_declared_in_class         (tree, tree);
6201 extern tree get_vtbl_decl_for_binfo             (tree);
6202 extern bool vptr_via_virtual_p                  (tree);
6203 extern void debug_class                         (tree);
6204 extern void debug_thunks                        (tree);
6205 extern void set_linkage_according_to_type       (tree, tree);
6206 extern void determine_key_method                (tree);
6207 extern void check_for_override                  (tree, tree);
6208 extern void push_class_stack                    (void);
6209 extern void pop_class_stack                     (void);
6210 extern bool default_ctor_p                      (tree);
6211 extern bool type_has_user_nondefault_constructor (tree);
6212 extern tree in_class_defaulted_default_constructor (tree);
6213 extern bool user_provided_p                     (tree);
6214 extern bool type_has_user_provided_constructor  (tree);
6215 extern bool type_has_non_user_provided_default_constructor (tree);
6216 extern bool vbase_has_user_provided_move_assign (tree);
6217 extern tree default_init_uninitialized_part (tree);
6218 extern bool trivial_default_constructor_is_constexpr (tree);
6219 extern bool type_has_constexpr_default_constructor (tree);
6220 extern bool type_has_virtual_destructor         (tree);
6221 extern bool classtype_has_move_assign_or_move_ctor_p (tree, bool user_declared);
6222 extern bool classtype_has_non_deleted_move_ctor (tree);
6223 extern tree classtype_has_user_copy_or_dtor     (tree);
6224 extern bool type_build_ctor_call                (tree);
6225 extern bool type_build_dtor_call                (tree);
6226 extern void explain_non_literal_class           (tree);
6227 extern void inherit_targ_abi_tags               (tree);
6228 extern void defaulted_late_check                (tree);
6229 extern bool defaultable_fn_check                (tree);
6230 extern void check_abi_tags                      (tree);
6231 extern tree missing_abi_tags                    (tree);
6232 extern void fixup_type_variants                 (tree);
6233 extern void fixup_attribute_variants            (tree);
6234 extern tree* decl_cloned_function_p             (const_tree, bool);
6235 extern void clone_function_decl                 (tree, bool);
6236 extern void adjust_clone_args                   (tree);
6237 extern void deduce_noexcept_on_destructor       (tree);
6238 extern bool uniquely_derived_from_p             (tree, tree);
6239 extern bool publicly_uniquely_derived_p         (tree, tree);
6240 extern tree common_enclosing_class              (tree, tree);
6241
6242 /* in cvt.c */
6243 extern tree convert_to_reference                (tree, tree, int, int, tree,
6244                                                  tsubst_flags_t);
6245 extern tree convert_from_reference              (tree);
6246 extern tree force_rvalue                        (tree, tsubst_flags_t);
6247 extern tree ocp_convert                         (tree, tree, int, int,
6248                                                  tsubst_flags_t);
6249 extern tree cp_convert                          (tree, tree, tsubst_flags_t);
6250 extern tree cp_convert_and_check                (tree, tree, tsubst_flags_t);
6251 extern tree cp_fold_convert                     (tree, tree);
6252 extern tree cp_get_callee                       (tree);
6253 extern tree cp_get_callee_fndecl                (tree);
6254 extern tree cp_get_callee_fndecl_nofold         (tree);
6255 extern tree cp_get_fndecl_from_callee           (tree, bool fold = true);
6256 extern tree convert_to_void                     (tree, impl_conv_void,
6257                                                  tsubst_flags_t);
6258 extern tree convert_force                       (tree, tree, int,
6259                                                  tsubst_flags_t);
6260 extern tree build_expr_type_conversion          (int, tree, bool);
6261 extern tree type_promotes_to                    (tree);
6262 extern bool can_convert_qual                    (tree, tree);
6263 extern tree perform_qualification_conversions   (tree, tree);
6264 extern bool tx_safe_fn_type_p                   (tree);
6265 extern tree tx_unsafe_fn_variant                (tree);
6266 extern bool fnptr_conv_p                        (tree, tree);
6267 extern tree strip_fnptr_conv                    (tree);
6268
6269 /* in name-lookup.c */
6270 extern void maybe_push_cleanup_level            (tree);
6271 extern tree make_anon_name                      (void);
6272 extern tree maybe_push_decl                     (tree);
6273 extern tree current_decl_namespace              (void);
6274
6275 /* decl.c */
6276 extern tree poplevel                            (int, int, int);
6277 extern void cxx_init_decl_processing            (void);
6278 enum cp_tree_node_structure_enum cp_tree_node_structure
6279                                                 (union lang_tree_node *);
6280 extern void finish_scope                        (void);
6281 extern void push_switch                         (tree);
6282 extern void pop_switch                          (void);
6283 extern void note_break_stmt                     (void);
6284 extern bool note_iteration_stmt_body_start      (void);
6285 extern void note_iteration_stmt_body_end        (bool);
6286 extern void determine_local_discriminator       (tree);
6287 extern tree make_lambda_name                    (void);
6288 extern int decls_match                          (tree, tree, bool = true);
6289 extern bool maybe_version_functions             (tree, tree, bool);
6290 extern tree duplicate_decls                     (tree, tree, bool);
6291 extern tree declare_local_label                 (tree);
6292 extern tree define_label                        (location_t, tree);
6293 extern void check_goto                          (tree);
6294 extern bool check_omp_return                    (void);
6295 extern tree make_typename_type                  (tree, tree, enum tag_types, tsubst_flags_t);
6296 extern tree build_typename_type                 (tree, tree, tree, tag_types);
6297 extern tree make_unbound_class_template         (tree, tree, tree, tsubst_flags_t);
6298 extern tree build_library_fn_ptr                (const char *, tree, int);
6299 extern tree build_cp_library_fn_ptr             (const char *, tree, int);
6300 extern tree push_library_fn                     (tree, tree, tree, int);
6301 extern tree push_void_library_fn                (tree, tree, int);
6302 extern tree push_throw_library_fn               (tree, tree);
6303 extern void warn_misplaced_attr_for_class_type  (source_location location,
6304                                                  tree class_type);
6305 extern tree check_tag_decl                      (cp_decl_specifier_seq *, bool);
6306 extern tree shadow_tag                          (cp_decl_specifier_seq *);
6307 extern tree groktypename                        (cp_decl_specifier_seq *, const cp_declarator *, bool);
6308 extern tree start_decl                          (const cp_declarator *, cp_decl_specifier_seq *, int, tree, tree, tree *);
6309 extern void start_decl_1                        (tree, bool);
6310 extern bool check_array_initializer             (tree, tree, tree);
6311 extern void cp_finish_decl                      (tree, tree, bool, tree, int);
6312 extern tree lookup_decomp_type                  (tree);
6313 extern void cp_maybe_mangle_decomp              (tree, tree, unsigned int);
6314 extern void cp_finish_decomp                    (tree, tree, unsigned int);
6315 extern int cp_complete_array_type               (tree *, tree, bool);
6316 extern int cp_complete_array_type_or_error      (tree *, tree, bool, tsubst_flags_t);
6317 extern tree build_ptrmemfunc_type               (tree);
6318 extern tree build_ptrmem_type                   (tree, tree);
6319 /* the grokdeclarator prototype is in decl.h */
6320 extern tree build_this_parm                     (tree, tree, cp_cv_quals);
6321 extern tree grokparms                           (tree, tree *);
6322 extern int copy_fn_p                            (const_tree);
6323 extern bool move_fn_p                           (const_tree);
6324 extern bool move_signature_fn_p                 (const_tree);
6325 extern tree get_scope_of_declarator             (const cp_declarator *);
6326 extern void grok_special_member_properties      (tree);
6327 extern bool grok_ctor_properties                (const_tree, const_tree);
6328 extern bool grok_op_properties                  (tree, bool);
6329 extern tree xref_tag                            (enum tag_types, tree, tag_scope, bool);
6330 extern tree xref_tag_from_type                  (tree, tree, tag_scope);
6331 extern void xref_basetypes                      (tree, tree);
6332 extern tree start_enum                          (tree, tree, tree, tree, bool, bool *);
6333 extern void finish_enum_value_list              (tree);
6334 extern void finish_enum                         (tree);
6335 extern void build_enumerator                    (tree, tree, tree, tree, location_t);
6336 extern tree lookup_enumerator                   (tree, tree);
6337 extern bool start_preparsed_function            (tree, tree, int);
6338 extern bool start_function                      (cp_decl_specifier_seq *,
6339                                                  const cp_declarator *, tree);
6340 extern tree begin_function_body                 (void);
6341 extern void finish_function_body                (tree);
6342 extern tree outer_curly_brace_block             (tree);
6343 extern tree finish_function                     (bool);
6344 extern tree grokmethod                          (cp_decl_specifier_seq *, const cp_declarator *, tree);
6345 extern void maybe_register_incomplete_var       (tree);
6346 extern void maybe_commonize_var                 (tree);
6347 extern void complete_vars                       (tree);
6348 extern tree static_fn_type                      (tree);
6349 extern void revert_static_member_fn             (tree);
6350 extern void fixup_anonymous_aggr                (tree);
6351 extern tree compute_array_index_type            (tree, tree, tsubst_flags_t);
6352 extern tree check_default_argument              (tree, tree, tsubst_flags_t);
6353 extern int wrapup_namespace_globals             ();
6354 extern tree create_implicit_typedef             (tree, tree);
6355 extern int local_variable_p                     (const_tree);
6356 extern tree register_dtor_fn                    (tree);
6357 extern tmpl_spec_kind current_tmpl_spec_kind    (int);
6358 extern tree cp_fname_init                       (const char *, tree *);
6359 extern tree cxx_builtin_function                (tree decl);
6360 extern tree cxx_builtin_function_ext_scope      (tree decl);
6361 extern tree check_elaborated_type_specifier     (enum tag_types, tree, bool);
6362 extern void warn_extern_redeclared_static       (tree, tree);
6363 extern tree cxx_comdat_group                    (tree);
6364 extern bool cp_missing_noreturn_ok_p            (tree);
6365 extern bool is_direct_enum_init                 (tree, tree);
6366 extern void initialize_artificial_var           (tree, vec<constructor_elt, va_gc> *);
6367 extern tree check_var_type                      (tree, tree);
6368 extern tree reshape_init                        (tree, tree, tsubst_flags_t);
6369 extern tree next_initializable_field (tree);
6370 extern tree fndecl_declared_return_type         (tree);
6371 extern bool undeduced_auto_decl                 (tree);
6372 extern bool require_deduced_type                (tree, tsubst_flags_t = tf_warning_or_error);
6373
6374 extern tree finish_case_label                   (location_t, tree, tree);
6375 extern tree cxx_maybe_build_cleanup             (tree, tsubst_flags_t);
6376 extern bool check_array_designated_initializer  (constructor_elt *,
6377                                                  unsigned HOST_WIDE_INT);
6378 extern bool check_for_uninitialized_const_var   (tree, bool, tsubst_flags_t);
6379 extern tree build_explicit_specifier            (tree, tsubst_flags_t);
6380
6381 /* in decl2.c */
6382 extern void record_mangling                     (tree, bool);
6383 extern void overwrite_mangling                  (tree, tree);
6384 extern void note_mangling_alias                 (tree, tree);
6385 extern void generate_mangling_aliases           (void);
6386 extern tree build_memfn_type                    (tree, tree, cp_cv_quals, cp_ref_qualifier);
6387 extern tree build_pointer_ptrmemfn_type (tree);
6388 extern tree change_return_type                  (tree, tree);
6389 extern void maybe_retrofit_in_chrg              (tree);
6390 extern void maybe_make_one_only                 (tree);
6391 extern bool vague_linkage_p                     (tree);
6392 extern void grokclassfn                         (tree, tree,
6393                                                  enum overload_flags);
6394 extern tree grok_array_decl                     (location_t, tree, tree, bool);
6395 extern tree delete_sanity                       (tree, tree, bool, int, tsubst_flags_t);
6396 extern tree check_classfn                       (tree, tree, tree);
6397 extern void check_member_template               (tree);
6398 extern tree grokfield (const cp_declarator *, cp_decl_specifier_seq *,
6399                        tree, bool, tree, tree);
6400 extern tree grokbitfield (const cp_declarator *, cp_decl_specifier_seq *,
6401                           tree, tree, tree);
6402 extern bool any_dependent_type_attributes_p     (tree);
6403 extern tree cp_reconstruct_complex_type         (tree, tree);
6404 extern bool attributes_naming_typedef_ok        (tree);
6405 extern void cplus_decl_attributes               (tree *, tree, int);
6406 extern void finish_anon_union                   (tree);
6407 extern void cxx_post_compilation_parsing_cleanups (void);
6408 extern tree coerce_new_type                     (tree, location_t);
6409 extern tree coerce_delete_type                  (tree, location_t);
6410 extern void comdat_linkage                      (tree);
6411 extern void determine_visibility                (tree);
6412 extern void constrain_class_visibility          (tree);
6413 extern void reset_type_linkage                  (tree);
6414 extern void tentative_decl_linkage              (tree);
6415 extern void import_export_decl                  (tree);
6416 extern tree build_cleanup                       (tree);
6417 extern tree build_offset_ref_call_from_tree     (tree, vec<tree, va_gc> **,
6418                                                  tsubst_flags_t);
6419 extern bool decl_defined_p                      (tree);
6420 extern bool decl_constant_var_p                 (tree);
6421 extern bool decl_maybe_constant_var_p           (tree);
6422 extern void no_linkage_error                    (tree);
6423 extern void check_default_args                  (tree);
6424 extern bool mark_used                           (tree);
6425 extern bool mark_used                           (tree, tsubst_flags_t);
6426 extern void finish_static_data_member_decl      (tree, tree, bool, tree, int);
6427 extern tree cp_build_parm_decl                  (tree, tree, tree);
6428 extern tree get_guard                           (tree);
6429 extern tree get_guard_cond                      (tree, bool);
6430 extern tree set_guard                           (tree);
6431 extern tree get_tls_wrapper_fn                  (tree);
6432 extern void mark_needed                         (tree);
6433 extern bool decl_needed_p                       (tree);
6434 extern void note_vague_linkage_fn               (tree);
6435 extern void note_variable_template_instantiation (tree);
6436 extern tree build_artificial_parm               (tree, tree, tree);
6437 extern bool possibly_inlined_p                  (tree);
6438 extern int parm_index                           (tree);
6439 extern tree vtv_start_verification_constructor_init_function (void);
6440 extern tree vtv_finish_verification_constructor_init_function (tree);
6441 extern bool cp_omp_mappable_type                (tree);
6442
6443 /* in error.c */
6444 extern const char *type_as_string               (tree, int);
6445 extern const char *type_as_string_translate     (tree, int);
6446 extern const char *decl_as_string               (tree, int);
6447 extern const char *decl_as_string_translate     (tree, int);
6448 extern const char *decl_as_dwarf_string         (tree, int);
6449 extern const char *expr_as_string               (tree, int);
6450 extern const char *expr_to_string               (tree);
6451 extern const char *lang_decl_name               (tree, int, bool);
6452 extern const char *lang_decl_dwarf_name         (tree, int, bool);
6453 extern const char *language_to_string           (enum languages);
6454 extern const char *class_key_or_enum_as_string  (tree);
6455 extern void maybe_warn_variadic_templates       (void);
6456 extern void maybe_warn_cpp0x                    (cpp0x_warn_str str);
6457 extern bool pedwarn_cxx98                       (location_t, int, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
6458 extern location_t location_of                   (tree);
6459 extern void qualified_name_lookup_error         (tree, tree, tree,
6460                                                  location_t);
6461
6462 /* in except.c */
6463 extern void init_exception_processing           (void);
6464 extern tree expand_start_catch_block            (tree);
6465 extern void expand_end_catch_block              (void);
6466 extern tree build_exc_ptr                       (void);
6467 extern tree build_throw                         (tree);
6468 extern int nothrow_libfn_p                      (const_tree);
6469 extern void check_handlers                      (tree);
6470 extern tree finish_noexcept_expr                (tree, tsubst_flags_t);
6471 extern bool expr_noexcept_p                     (tree, tsubst_flags_t);
6472 extern void perform_deferred_noexcept_checks    (void);
6473 extern bool nothrow_spec_p                      (const_tree);
6474 extern bool type_noexcept_p                     (const_tree);
6475 extern bool type_throw_all_p                    (const_tree);
6476 extern tree build_noexcept_spec                 (tree, tsubst_flags_t);
6477 extern void choose_personality_routine          (enum languages);
6478 extern tree build_must_not_throw_expr           (tree,tree);
6479 extern tree eh_type_info                        (tree);
6480 extern tree begin_eh_spec_block                 (void);
6481 extern void finish_eh_spec_block                (tree, tree);
6482 extern tree build_eh_type_type                  (tree);
6483 extern tree cp_protect_cleanup_actions          (void);
6484 extern tree create_try_catch_expr               (tree, tree);
6485
6486 /* in expr.c */
6487 extern tree cplus_expand_constant               (tree);
6488 extern tree mark_use (tree expr, bool rvalue_p, bool read_p,
6489                       location_t = UNKNOWN_LOCATION,
6490                       bool reject_builtin = true);
6491 extern tree mark_rvalue_use                     (tree,
6492                                                  location_t = UNKNOWN_LOCATION,
6493                                                  bool reject_builtin = true);
6494 extern tree mark_lvalue_use                     (tree);
6495 extern tree mark_lvalue_use_nonread             (tree);
6496 extern tree mark_type_use                       (tree);
6497 extern tree mark_discarded_use                  (tree);
6498 extern void mark_exp_read                       (tree);
6499
6500 /* friend.c */
6501 extern int is_friend                            (tree, tree);
6502 extern void make_friend_class                   (tree, tree, bool);
6503 extern void add_friend                          (tree, tree, bool);
6504 extern tree do_friend                           (tree, tree, tree, tree,
6505                                                  enum overload_flags, bool);
6506
6507 extern void set_global_friend                   (tree);
6508 extern bool is_global_friend                    (tree);
6509
6510 /* in init.c */
6511 extern tree expand_member_init                  (tree);
6512 extern void emit_mem_initializers               (tree);
6513 extern tree build_aggr_init                     (tree, tree, int,
6514                                                  tsubst_flags_t);
6515 extern int is_class_type                        (tree, int);
6516 extern tree get_type_value                      (tree);
6517 extern tree build_zero_init                     (tree, tree, bool);
6518 extern tree build_value_init                    (tree, tsubst_flags_t);
6519 extern tree build_value_init_noctor             (tree, tsubst_flags_t);
6520 extern tree get_nsdmi                           (tree, bool, tsubst_flags_t);
6521 extern tree build_offset_ref                    (tree, tree, bool,
6522                                                  tsubst_flags_t);
6523 extern tree throw_bad_array_new_length          (void);
6524 extern bool type_has_new_extended_alignment     (tree);
6525 extern unsigned malloc_alignment                (void);
6526 extern tree build_new                           (vec<tree, va_gc> **, tree, tree,
6527                                                  vec<tree, va_gc> **, int,
6528                                                  tsubst_flags_t);
6529 extern tree get_temp_regvar                     (tree, tree);
6530 extern tree build_vec_init                      (tree, tree, tree, bool, int,
6531                                                  tsubst_flags_t);
6532 extern tree build_delete                        (tree, tree,
6533                                                  special_function_kind,
6534                                                  int, int, tsubst_flags_t);
6535 extern void push_base_cleanups                  (void);
6536 extern tree build_vec_delete                    (tree, tree,
6537                                                  special_function_kind, int,
6538                                                  tsubst_flags_t);
6539 extern tree create_temporary_var                (tree);
6540 extern void initialize_vtbl_ptrs                (tree);
6541 extern tree scalar_constant_value               (tree);
6542 extern tree decl_really_constant_value          (tree);
6543 extern int diagnose_uninitialized_cst_or_ref_member (tree, bool, bool);
6544 extern tree build_vtbl_address                  (tree);
6545 extern bool maybe_reject_flexarray_init         (tree, tree);
6546
6547 /* in lex.c */
6548 extern void cxx_dup_lang_specific_decl          (tree);
6549 extern void yyungetc                            (int, int);
6550
6551 extern tree unqualified_name_lookup_error       (tree,
6552                                                  location_t = UNKNOWN_LOCATION);
6553 extern tree unqualified_fn_lookup_error         (cp_expr);
6554 extern tree make_conv_op_name                   (tree);
6555 extern tree build_lang_decl                     (enum tree_code, tree, tree);
6556 extern tree build_lang_decl_loc                 (location_t, enum tree_code, tree, tree);
6557 extern void retrofit_lang_decl                  (tree);
6558 extern void fit_decomposition_lang_decl         (tree, tree);
6559 extern tree copy_decl                           (tree CXX_MEM_STAT_INFO);
6560 extern tree copy_type                           (tree CXX_MEM_STAT_INFO);
6561 extern tree cxx_make_type                       (enum tree_code CXX_MEM_STAT_INFO);
6562 extern tree make_class_type                     (enum tree_code CXX_MEM_STAT_INFO);
6563 extern const char *get_identifier_kind_name     (tree);
6564 extern void set_identifier_kind                 (tree, cp_identifier_kind);
6565 extern bool cxx_init                            (void);
6566 extern void cxx_finish                          (void);
6567 extern bool in_main_input_context               (void);
6568
6569 /* in method.c */
6570 extern void init_method                         (void);
6571 extern tree make_thunk                          (tree, bool, tree, tree);
6572 extern void finish_thunk                        (tree);
6573 extern void use_thunk                           (tree, bool);
6574 extern bool trivial_fn_p                        (tree);
6575 extern tree forward_parm                        (tree);
6576 extern bool is_trivially_xible                  (enum tree_code, tree, tree);
6577 extern bool is_xible                            (enum tree_code, tree, tree);
6578 extern tree get_defaulted_eh_spec               (tree, tsubst_flags_t = tf_warning_or_error);
6579 extern void after_nsdmi_defaulted_late_checks   (tree);
6580 extern bool maybe_explain_implicit_delete       (tree);
6581 extern void explain_implicit_non_constexpr      (tree);
6582 extern void deduce_inheriting_ctor              (tree);
6583 extern void synthesize_method                   (tree);
6584 extern tree lazily_declare_fn                   (special_function_kind,
6585                                                  tree);
6586 extern tree skip_artificial_parms_for           (const_tree, tree);
6587 extern int num_artificial_parms_for             (const_tree);
6588 extern tree make_alias_for                      (tree, tree);
6589 extern tree get_copy_ctor                       (tree, tsubst_flags_t);
6590 extern tree get_copy_assign                     (tree);
6591 extern tree get_default_ctor                    (tree);
6592 extern tree get_dtor                            (tree, tsubst_flags_t);
6593 extern tree strip_inheriting_ctors              (tree);
6594 extern tree inherited_ctor_binfo                (tree);
6595 extern bool ctor_omit_inherited_parms           (tree);
6596 extern tree locate_ctor                         (tree);
6597 extern tree implicitly_declare_fn               (special_function_kind, tree,
6598                                                  bool, tree, tree);
6599
6600 /* In optimize.c */
6601 extern bool maybe_clone_body                    (tree);
6602
6603 /* In parser.c */
6604 extern tree cp_convert_range_for (tree, tree, tree, tree, unsigned int, bool,
6605                                   unsigned short);
6606 extern bool parsing_nsdmi (void);
6607 extern bool parsing_default_capturing_generic_lambda_in_template (void);
6608 extern void inject_this_parameter (tree, cp_cv_quals);
6609 extern location_t defarg_location (tree);
6610 extern void maybe_show_extern_c_location (void);
6611 extern bool literal_integer_zerop (const_tree);
6612
6613 /* in pt.c */
6614 extern bool check_template_shadow               (tree);
6615 extern bool check_auto_in_tmpl_args             (tree, tree);
6616 extern tree get_innermost_template_args         (tree, int);
6617 extern void maybe_begin_member_template_processing (tree);
6618 extern void maybe_end_member_template_processing (void);
6619 extern tree finish_member_template_decl         (tree);
6620 extern void begin_template_parm_list            (void);
6621 extern bool begin_specialization                (void);
6622 extern void reset_specialization                (void);
6623 extern void end_specialization                  (void);
6624 extern void begin_explicit_instantiation        (void);
6625 extern void end_explicit_instantiation          (void);
6626 extern void check_unqualified_spec_or_inst      (tree, location_t);
6627 extern tree check_explicit_specialization       (tree, tree, int, int,
6628                                                  tree = NULL_TREE);
6629 extern int num_template_headers_for_class       (tree);
6630 extern void check_template_variable             (tree);
6631 extern tree make_auto                           (void);
6632 extern tree make_decltype_auto                  (void);
6633 extern tree make_template_placeholder           (tree);
6634 extern bool template_placeholder_p              (tree);
6635 extern tree do_auto_deduction                   (tree, tree, tree,
6636                                                  tsubst_flags_t
6637                                                  = tf_warning_or_error,
6638                                                  auto_deduction_context
6639                                                  = adc_unspecified,
6640                                                  tree = NULL_TREE,
6641                                                  int = LOOKUP_NORMAL);
6642 extern tree type_uses_auto                      (tree);
6643 extern tree type_uses_auto_or_concept           (tree);
6644 extern void append_type_to_template_for_access_check (tree, tree, tree,
6645                                                       location_t);
6646 extern tree convert_generic_types_to_packs      (tree, int, int);
6647 extern tree splice_late_return_type             (tree, tree);
6648 extern bool is_auto                             (const_tree);
6649 extern tree process_template_parm               (tree, location_t, tree,
6650                                                  bool, bool);
6651 extern tree end_template_parm_list              (tree);
6652 extern void end_template_parm_list              (void);
6653 extern void end_template_decl                   (void);
6654 extern tree maybe_update_decl_type              (tree, tree);
6655 extern bool check_default_tmpl_args             (tree, tree, bool, bool, int);
6656 extern tree push_template_decl                  (tree);
6657 extern tree push_template_decl_real             (tree, bool);
6658 extern tree add_inherited_template_parms        (tree, tree);
6659 extern bool redeclare_class_template            (tree, tree, tree);
6660 extern tree lookup_template_class               (tree, tree, tree, tree,
6661                                                  int, tsubst_flags_t);
6662 extern tree lookup_template_function            (tree, tree);
6663 extern tree lookup_template_variable            (tree, tree);
6664 extern int uses_template_parms                  (tree);
6665 extern bool uses_template_parms_level           (tree, int);
6666 extern bool in_template_function                (void);
6667 extern bool need_generic_capture                (void);
6668 extern tree instantiate_class_template          (tree);
6669 extern tree instantiate_template                (tree, tree, tsubst_flags_t);
6670 extern tree fn_type_unification                 (tree, tree, tree,
6671                                                  const tree *, unsigned int,
6672                                                  tree, unification_kind_t, int,
6673                                                  struct conversion **,
6674                                                  bool, bool);
6675 extern void mark_decl_instantiated              (tree, int);
6676 extern int more_specialized_fn                  (tree, tree, int);
6677 extern void do_decl_instantiation               (tree, tree);
6678 extern void do_type_instantiation               (tree, tree, tsubst_flags_t);
6679 extern bool always_instantiate_p                (tree);
6680 extern bool maybe_instantiate_noexcept          (tree, tsubst_flags_t = tf_warning_or_error);
6681 extern tree instantiate_decl                    (tree, bool, bool);
6682 extern int comp_template_parms                  (const_tree, const_tree);
6683 extern bool builtin_pack_fn_p                   (tree);
6684 extern bool uses_parameter_packs                (tree);
6685 extern bool template_parameter_pack_p           (const_tree);
6686 extern bool function_parameter_pack_p           (const_tree);
6687 extern bool function_parameter_expanded_from_pack_p (tree, tree);
6688 extern tree make_pack_expansion                 (tree, tsubst_flags_t = tf_warning_or_error);
6689 extern bool check_for_bare_parameter_packs      (tree, location_t = UNKNOWN_LOCATION);
6690 extern tree build_template_info                 (tree, tree);
6691 extern tree get_template_info                   (const_tree);
6692 extern vec<qualified_typedef_usage_t, va_gc> *get_types_needing_access_check (tree);
6693 extern int template_class_depth                 (tree);
6694 extern int is_specialization_of                 (tree, tree);
6695 extern bool is_specialization_of_friend         (tree, tree);
6696 extern tree get_pattern_parm                    (tree, tree);
6697 extern int comp_template_args                   (tree, tree, tree * = NULL,
6698                                                  tree * = NULL, bool = false);
6699 extern int template_args_equal                  (tree, tree, bool = false);
6700 extern tree maybe_process_partial_specialization (tree);
6701 extern tree most_specialized_instantiation      (tree);
6702 extern void print_candidates                    (tree);
6703 extern void instantiate_pending_templates       (int);
6704 extern tree tsubst_default_argument             (tree, int, tree, tree,
6705                                                  tsubst_flags_t);
6706 extern tree tsubst (tree, tree, tsubst_flags_t, tree);
6707 extern tree tsubst_copy_and_build               (tree, tree, tsubst_flags_t,
6708                                                  tree, bool, bool);
6709 extern tree tsubst_expr                         (tree, tree, tsubst_flags_t,
6710                                                  tree, bool);
6711 extern tree tsubst_pack_expansion               (tree, tree, tsubst_flags_t, tree);
6712 extern tree most_general_template               (tree);
6713 extern tree get_mostly_instantiated_function_type (tree);
6714 extern bool problematic_instantiation_changed   (void);
6715 extern void record_last_problematic_instantiation (void);
6716 extern struct tinst_level *current_instantiation(void);
6717 extern bool instantiating_current_function_p    (void);
6718 extern tree maybe_get_template_decl_from_type_decl (tree);
6719 extern int processing_template_parmlist;
6720 extern bool dependent_type_p                    (tree);
6721 extern bool dependent_scope_p                   (tree);
6722 extern bool any_dependent_template_arguments_p  (const_tree);
6723 extern bool any_erroneous_template_args_p       (const_tree);
6724 extern bool dependent_template_p                (tree);
6725 extern bool dependent_template_id_p             (tree, tree);
6726 extern bool type_dependent_expression_p         (tree);
6727 extern bool type_dependent_object_expression_p  (tree);
6728 extern bool any_type_dependent_arguments_p      (const vec<tree, va_gc> *);
6729 extern bool any_type_dependent_elements_p       (const_tree);
6730 extern bool type_dependent_expression_p_push    (tree);
6731 extern bool value_dependent_expression_p        (tree);
6732 extern bool instantiation_dependent_expression_p (tree);
6733 extern bool instantiation_dependent_uneval_expression_p (tree);
6734 extern bool any_value_dependent_elements_p      (const_tree);
6735 extern bool dependent_omp_for_p                 (tree, tree, tree, tree);
6736 extern tree resolve_typename_type               (tree, bool);
6737 extern tree template_for_substitution           (tree);
6738 extern tree build_non_dependent_expr            (tree);
6739 extern void make_args_non_dependent             (vec<tree, va_gc> *);
6740 extern bool reregister_specialization           (tree, tree, tree);
6741 extern tree instantiate_non_dependent_expr      (tree);
6742 extern tree instantiate_non_dependent_expr_sfinae (tree, tsubst_flags_t);
6743 extern tree instantiate_non_dependent_expr_internal (tree, tsubst_flags_t);
6744 extern tree instantiate_non_dependent_or_null   (tree);
6745 extern bool variable_template_specialization_p  (tree);
6746 extern bool alias_type_or_template_p            (tree);
6747 extern bool alias_template_specialization_p     (const_tree);
6748 extern bool dependent_alias_template_spec_p     (const_tree);
6749 extern bool explicit_class_specialization_p     (tree);
6750 extern bool push_tinst_level                    (tree);
6751 extern bool push_tinst_level_loc                (tree, location_t);
6752 extern void pop_tinst_level                     (void);
6753 extern struct tinst_level *outermost_tinst_level(void);
6754 extern void init_template_processing            (void);
6755 extern void print_template_statistics           (void);
6756 bool template_template_parameter_p              (const_tree);
6757 bool template_type_parameter_p                  (const_tree);
6758 extern bool primary_template_specialization_p   (const_tree);
6759 extern tree get_primary_template_innermost_parameters   (const_tree);
6760 extern tree get_template_parms_at_level (tree, int);
6761 extern tree get_template_innermost_arguments    (const_tree);
6762 extern tree get_template_argument_pack_elems    (const_tree);
6763 extern tree get_function_template_decl          (const_tree);
6764 extern tree resolve_nondeduced_context          (tree, tsubst_flags_t);
6765 extern hashval_t iterative_hash_template_arg (tree arg, hashval_t val);
6766 extern tree coerce_template_parms               (tree, tree, tree);
6767 extern tree coerce_template_parms               (tree, tree, tree, tsubst_flags_t);
6768 extern void register_local_specialization       (tree, tree);
6769 extern tree retrieve_local_specialization       (tree);
6770 extern tree extract_fnparm_pack                 (tree, tree *);
6771 extern tree template_parm_to_arg                (tree);
6772 extern tree dguide_name                         (tree);
6773 extern bool dguide_name_p                       (tree);
6774 extern bool deduction_guide_p                   (const_tree);
6775 extern bool copy_guide_p                        (const_tree);
6776 extern bool template_guide_p                    (const_tree);
6777 extern void store_explicit_specifier            (tree, tree);
6778
6779 /* in repo.c */
6780 extern void init_repo                           (void);
6781 extern int repo_emit_p                          (tree);
6782 extern bool repo_export_class_p                 (const_tree);
6783 extern void finish_repo                         (void);
6784
6785 /* in rtti.c */
6786 /* A vector of all tinfo decls that haven't been emitted yet.  */
6787 extern GTY(()) vec<tree, va_gc> *unemitted_tinfo_decls;
6788
6789 extern void init_rtti_processing                (void);
6790 extern tree build_typeid                        (tree, tsubst_flags_t);
6791 extern tree get_tinfo_decl                      (tree);
6792 extern tree get_typeid                          (tree, tsubst_flags_t);
6793 extern tree build_headof                        (tree);
6794 extern tree build_dynamic_cast                  (tree, tree, tsubst_flags_t);
6795 extern void emit_support_tinfos                 (void);
6796 extern bool emit_tinfo_decl                     (tree);
6797
6798 /* in search.c */
6799 extern bool accessible_base_p                   (tree, tree, bool);
6800 extern tree lookup_base                         (tree, tree, base_access,
6801                                                  base_kind *, tsubst_flags_t);
6802 extern tree dcast_base_hint                     (tree, tree);
6803 extern int accessible_p                         (tree, tree, bool);
6804 extern int accessible_in_template_p             (tree, tree);
6805 extern tree lookup_field                        (tree, tree, int, bool);
6806 extern tree lookup_fnfields                     (tree, tree, int);
6807 extern tree lookup_member                       (tree, tree, int, bool,
6808                                                  tsubst_flags_t,
6809                                                  access_failure_info *afi = NULL);
6810 extern tree lookup_member_fuzzy         (tree, tree, bool);
6811 extern tree locate_field_accessor               (tree, tree, bool);
6812 extern int look_for_overrides                   (tree, tree);
6813 extern void get_pure_virtuals                   (tree);
6814 extern void maybe_suppress_debug_info           (tree);
6815 extern void note_debug_info_needed              (tree);
6816 extern tree current_scope                       (void);
6817 extern int at_function_scope_p                  (void);
6818 extern bool at_class_scope_p                    (void);
6819 extern bool at_namespace_scope_p                (void);
6820 extern tree context_for_name_lookup             (tree);
6821 extern tree lookup_conversions                  (tree);
6822 extern tree binfo_from_vbase                    (tree);
6823 extern tree binfo_for_vbase                     (tree, tree);
6824 extern tree look_for_overrides_here             (tree, tree);
6825 #define dfs_skip_bases ((tree)1)
6826 extern tree dfs_walk_all (tree, tree (*) (tree, void *),
6827                           tree (*) (tree, void *), void *);
6828 extern tree dfs_walk_once (tree, tree (*) (tree, void *),
6829                            tree (*) (tree, void *), void *);
6830 extern tree binfo_via_virtual                   (tree, tree);
6831 extern bool binfo_direct_p                      (tree);
6832 extern tree build_baselink                      (tree, tree, tree, tree);
6833 extern tree adjust_result_of_qualified_name_lookup
6834                                                 (tree, tree, tree);
6835 extern tree copied_binfo                        (tree, tree);
6836 extern tree original_binfo                      (tree, tree);
6837 extern int shared_member_p                      (tree);
6838 extern bool any_dependent_bases_p (tree = current_nonlambda_class_type ());
6839
6840 /* The representation of a deferred access check.  */
6841
6842 struct GTY(()) deferred_access_check {
6843   /* The base class in which the declaration is referenced. */
6844   tree binfo;
6845   /* The declaration whose access must be checked.  */
6846   tree decl;
6847   /* The declaration that should be used in the error message.  */
6848   tree diag_decl;
6849   /* The location of this access.  */
6850   location_t loc;
6851 };
6852
6853 /* in semantics.c */
6854 extern void push_deferring_access_checks        (deferring_kind);
6855 extern void resume_deferring_access_checks      (void);
6856 extern void stop_deferring_access_checks        (void);
6857 extern void pop_deferring_access_checks         (void);
6858 extern vec<deferred_access_check, va_gc> *get_deferred_access_checks (void);
6859 extern void reopen_deferring_access_checks (vec<deferred_access_check, va_gc> *);
6860 extern void pop_to_parent_deferring_access_checks (void);
6861 extern bool perform_access_checks (vec<deferred_access_check, va_gc> *,
6862                                    tsubst_flags_t);
6863 extern bool perform_deferred_access_checks      (tsubst_flags_t);
6864 extern bool perform_or_defer_access_check       (tree, tree, tree,
6865                                                  tsubst_flags_t,
6866                                                  access_failure_info *afi = NULL);
6867
6868 /* RAII sentinel to ensures that deferred access checks are popped before
6869   a function returns.  */
6870
6871 struct deferring_access_check_sentinel
6872 {
6873   deferring_access_check_sentinel (enum deferring_kind kind = dk_deferred)
6874   {
6875     push_deferring_access_checks (kind);
6876   }
6877   ~deferring_access_check_sentinel ()
6878   {
6879     pop_deferring_access_checks ();
6880   }
6881 };
6882
6883 extern int stmts_are_full_exprs_p               (void);
6884 extern void init_cp_semantics                   (void);
6885 extern tree do_poplevel                         (tree);
6886 extern void break_maybe_infinite_loop           (void);
6887 extern void add_decl_expr                       (tree);
6888 extern tree maybe_cleanup_point_expr_void       (tree);
6889 extern tree finish_expr_stmt                    (tree);
6890 extern tree begin_if_stmt                       (void);
6891 extern tree finish_if_stmt_cond                 (tree, tree);
6892 extern tree finish_then_clause                  (tree);
6893 extern void begin_else_clause                   (tree);
6894 extern void finish_else_clause                  (tree);
6895 extern void finish_if_stmt                      (tree);
6896 extern tree begin_while_stmt                    (void);
6897 extern void finish_while_stmt_cond      (tree, tree, bool, unsigned short);
6898 extern void finish_while_stmt                   (tree);
6899 extern tree begin_do_stmt                       (void);
6900 extern void finish_do_body                      (tree);
6901 extern void finish_do_stmt              (tree, tree, bool, unsigned short);
6902 extern tree finish_return_stmt                  (tree);
6903 extern tree begin_for_scope                     (tree *);
6904 extern tree begin_for_stmt                      (tree, tree);
6905 extern void finish_init_stmt                    (tree);
6906 extern void finish_for_cond             (tree, tree, bool, unsigned short);
6907 extern void finish_for_expr                     (tree, tree);
6908 extern void finish_for_stmt                     (tree);
6909 extern tree begin_range_for_stmt                (tree, tree);
6910 extern void finish_range_for_decl               (tree, tree, tree);
6911 extern void finish_range_for_stmt               (tree);
6912 extern tree finish_break_stmt                   (void);
6913 extern tree finish_continue_stmt                (void);
6914 extern tree begin_switch_stmt                   (void);
6915 extern void finish_switch_cond                  (tree, tree);
6916 extern void finish_switch_stmt                  (tree);
6917 extern tree finish_goto_stmt                    (tree);
6918 extern tree begin_try_block                     (void);
6919 extern void finish_try_block                    (tree);
6920 extern void finish_handler_sequence             (tree);
6921 extern tree begin_function_try_block            (tree *);
6922 extern void finish_function_try_block           (tree);
6923 extern void finish_function_handler_sequence    (tree, tree);
6924 extern void finish_cleanup_try_block            (tree);
6925 extern tree begin_handler                       (void);
6926 extern void finish_handler_parms                (tree, tree);
6927 extern void finish_handler                      (tree);
6928 extern void finish_cleanup                      (tree, tree);
6929 extern bool is_this_parameter                   (tree);
6930
6931 enum {
6932   BCS_NORMAL = 0,
6933   BCS_NO_SCOPE = 1,
6934   BCS_TRY_BLOCK = 2,
6935   BCS_FN_BODY = 4,
6936   BCS_TRANSACTION = 8
6937 };
6938 extern tree begin_compound_stmt                 (unsigned int);
6939
6940 extern void finish_compound_stmt                (tree);
6941 extern tree finish_asm_stmt                     (int, tree, tree, tree, tree,
6942                                                  tree);
6943 extern tree finish_label_stmt                   (tree);
6944 extern void finish_label_decl                   (tree);
6945 extern cp_expr finish_parenthesized_expr        (cp_expr);
6946 extern tree force_paren_expr                    (tree);
6947 extern tree maybe_undo_parenthesized_ref        (tree);
6948 extern tree maybe_strip_ref_conversion          (tree);
6949 extern tree finish_non_static_data_member       (tree, tree, tree);
6950 extern tree begin_stmt_expr                     (void);
6951 extern tree finish_stmt_expr_expr               (tree, tree);
6952 extern tree finish_stmt_expr                    (tree, bool);
6953 extern tree stmt_expr_value_expr                (tree);
6954 bool empty_expr_stmt_p                          (tree);
6955 extern cp_expr perform_koenig_lookup            (cp_expr, vec<tree, va_gc> *,
6956                                                  tsubst_flags_t);
6957 extern tree finish_call_expr                    (tree, vec<tree, va_gc> **, bool,
6958                                                  bool, tsubst_flags_t);
6959 extern tree lookup_and_finish_template_variable (tree, tree, tsubst_flags_t = tf_warning_or_error);
6960 extern tree finish_template_variable            (tree, tsubst_flags_t = tf_warning_or_error);
6961 extern cp_expr finish_increment_expr            (cp_expr, enum tree_code);
6962 extern tree finish_this_expr                    (void);
6963 extern tree finish_pseudo_destructor_expr       (tree, tree, tree, location_t);
6964 extern cp_expr finish_unary_op_expr             (location_t, enum tree_code, cp_expr,
6965                                                  tsubst_flags_t);
6966 /* Whether this call to finish_compound_literal represents a C++11 functional
6967    cast or a C99 compound literal.  */
6968 enum fcl_t { fcl_functional, fcl_c99 };
6969 extern tree finish_compound_literal             (tree, tree, tsubst_flags_t, fcl_t = fcl_functional);
6970 extern tree finish_fname                        (tree);
6971 extern void finish_translation_unit             (void);
6972 extern tree finish_template_type_parm           (tree, tree);
6973 extern tree finish_template_template_parm       (tree, tree);
6974 extern tree begin_class_definition              (tree);
6975 extern void finish_template_decl                (tree);
6976 extern tree finish_template_type                (tree, tree, int);
6977 extern tree finish_base_specifier               (tree, tree, bool);
6978 extern void finish_member_declaration           (tree);
6979 extern bool outer_automatic_var_p               (tree);
6980 extern tree process_outer_var_ref               (tree, tsubst_flags_t, bool force_use = false);
6981 extern cp_expr finish_id_expression             (tree, tree, tree,
6982                                                  cp_id_kind *,
6983                                                  bool, bool, bool *,
6984                                                  bool, bool, bool, bool,
6985                                                  const char **,
6986                                                  location_t);
6987 extern tree finish_typeof                       (tree);
6988 extern tree finish_underlying_type              (tree);
6989 extern tree calculate_bases                     (tree, tsubst_flags_t);
6990 extern tree finish_bases                        (tree, bool);
6991 extern tree calculate_direct_bases              (tree, tsubst_flags_t);
6992 extern tree finish_offsetof                     (tree, tree, location_t);
6993 extern void finish_decl_cleanup                 (tree, tree);
6994 extern void finish_eh_cleanup                   (tree);
6995 extern void emit_associated_thunks              (tree);
6996 extern void finish_mem_initializers             (tree);
6997 extern tree check_template_template_default_arg (tree);
6998 extern bool expand_or_defer_fn_1                (tree);
6999 extern void expand_or_defer_fn                  (tree);
7000 extern void add_typedef_to_current_template_for_access_check (tree, tree,
7001                                                               location_t);
7002 extern void check_accessibility_of_qualified_id (tree, tree, tree);
7003 extern tree finish_qualified_id_expr            (tree, tree, bool, bool,
7004                                                  bool, bool, tsubst_flags_t);
7005 extern void simplify_aggr_init_expr             (tree *);
7006 extern void finalize_nrv                        (tree *, tree, tree);
7007 extern tree omp_reduction_id                    (enum tree_code, tree, tree);
7008 extern tree cp_remove_omp_priv_cleanup_stmt     (tree *, int *, void *);
7009 extern void cp_check_omp_declare_reduction      (tree);
7010 extern void finish_omp_declare_simd_methods     (tree);
7011 extern tree finish_omp_clauses                  (tree, enum c_omp_region_type);
7012 extern tree push_omp_privatization_clauses      (bool);
7013 extern void pop_omp_privatization_clauses       (tree);
7014 extern void save_omp_privatization_clauses      (vec<tree> &);
7015 extern void restore_omp_privatization_clauses   (vec<tree> &);
7016 extern void finish_omp_threadprivate            (tree);
7017 extern tree begin_omp_structured_block          (void);
7018 extern tree finish_omp_structured_block         (tree);
7019 extern tree finish_oacc_data                    (tree, tree);
7020 extern tree finish_oacc_host_data               (tree, tree);
7021 extern tree finish_omp_construct                (enum tree_code, tree, tree);
7022 extern tree begin_omp_parallel                  (void);
7023 extern tree finish_omp_parallel                 (tree, tree);
7024 extern tree begin_omp_task                      (void);
7025 extern tree finish_omp_task                     (tree, tree);
7026 extern tree finish_omp_for                      (location_t, enum tree_code,
7027                                                  tree, tree, tree, tree, tree,
7028                                                  tree, tree, vec<tree> *, tree);
7029 extern void finish_omp_atomic                   (enum tree_code, enum tree_code,
7030                                                  tree, tree, tree, tree, tree,
7031                                                  bool);
7032 extern void finish_omp_barrier                  (void);
7033 extern void finish_omp_flush                    (void);
7034 extern void finish_omp_taskwait                 (void);
7035 extern void finish_omp_taskyield                (void);
7036 extern void finish_omp_cancel                   (tree);
7037 extern void finish_omp_cancellation_point       (tree);
7038 extern tree omp_privatize_field                 (tree, bool);
7039 extern tree begin_transaction_stmt              (location_t, tree *, int);
7040 extern void finish_transaction_stmt             (tree, tree, int, tree);
7041 extern tree build_transaction_expr              (location_t, tree, int, tree);
7042 extern bool cxx_omp_create_clause_info          (tree, tree, bool, bool,
7043                                                  bool, bool);
7044 extern tree baselink_for_fns                    (tree);
7045 extern void finish_static_assert                (tree, tree, location_t,
7046                                                  bool);
7047 extern tree finish_decltype_type                (tree, bool, tsubst_flags_t);
7048 extern tree finish_trait_expr                   (enum cp_trait_kind, tree, tree);
7049 extern tree build_lambda_expr                   (void);
7050 extern tree build_lambda_object                 (tree);
7051 extern tree begin_lambda_type                   (tree);
7052 extern tree lambda_capture_field_type           (tree, bool, bool);
7053 extern tree lambda_return_type                  (tree);
7054 extern tree lambda_proxy_type                   (tree);
7055 extern tree lambda_function                     (tree);
7056 extern void apply_deduced_return_type           (tree, tree);
7057 extern tree add_capture                         (tree, tree, tree, bool, bool);
7058 extern tree add_default_capture                 (tree, tree, tree);
7059 extern void insert_capture_proxy                (tree);
7060 extern void insert_pending_capture_proxies      (void);
7061 extern bool is_capture_proxy                    (tree);
7062 extern bool is_normal_capture_proxy             (tree);
7063 extern bool is_constant_capture_proxy           (tree);
7064 extern void register_capture_members            (tree);
7065 extern tree lambda_expr_this_capture            (tree, bool);
7066 extern void maybe_generic_this_capture          (tree, tree);
7067 extern tree maybe_resolve_dummy                 (tree, bool);
7068 extern tree current_nonlambda_function          (void);
7069 extern tree nonlambda_method_basetype           (void);
7070 extern tree current_nonlambda_scope             (void);
7071 extern tree current_lambda_expr                 (void);
7072 extern bool generic_lambda_fn_p                 (tree);
7073 extern tree do_dependent_capture                (tree, bool = false);
7074 extern bool lambda_fn_in_template_p             (tree);
7075 extern void maybe_add_lambda_conv_op            (tree);
7076 extern bool is_lambda_ignored_entity            (tree);
7077 extern bool lambda_static_thunk_p               (tree);
7078 extern tree finish_builtin_launder              (location_t, tree,
7079                                                  tsubst_flags_t);
7080 extern void start_lambda_scope                  (tree);
7081 extern void record_lambda_scope                 (tree);
7082 extern void record_null_lambda_scope            (tree);
7083 extern void finish_lambda_scope                 (void);
7084 extern tree start_lambda_function               (tree fn, tree lambda_expr);
7085 extern void finish_lambda_function              (tree body);
7086
7087 /* in tree.c */
7088 extern int cp_tree_operand_length               (const_tree);
7089 extern int cp_tree_code_length                  (enum tree_code);
7090 extern void cp_free_lang_data                   (tree t);
7091 extern tree force_target_expr                   (tree, tree, tsubst_flags_t);
7092 extern tree build_target_expr_with_type         (tree, tree, tsubst_flags_t);
7093 extern void lang_check_failed                   (const char *, int,
7094                                                  const char *) ATTRIBUTE_NORETURN
7095                                                  ATTRIBUTE_COLD;
7096 extern tree stabilize_expr                      (tree, tree *);
7097 extern void stabilize_call                      (tree, tree *);
7098 extern bool stabilize_init                      (tree, tree *);
7099 extern tree add_stmt_to_compound                (tree, tree);
7100 extern void init_tree                           (void);
7101 extern bool pod_type_p                          (const_tree);
7102 extern bool layout_pod_type_p                   (const_tree);
7103 extern bool std_layout_type_p                   (const_tree);
7104 extern bool trivial_type_p                      (const_tree);
7105 extern bool trivially_copyable_p                (const_tree);
7106 extern bool type_has_unique_obj_representations (const_tree);
7107 extern bool scalarish_type_p                    (const_tree);
7108 extern bool type_has_nontrivial_default_init    (const_tree);
7109 extern bool type_has_nontrivial_copy_init       (const_tree);
7110 extern void maybe_warn_parm_abi                 (tree, location_t);
7111 extern bool class_tmpl_impl_spec_p              (const_tree);
7112 extern int zero_init_p                          (const_tree);
7113 extern bool check_abi_tag_redeclaration         (const_tree, const_tree,
7114                                                  const_tree);
7115 extern bool check_abi_tag_args                  (tree, tree);
7116 extern tree strip_typedefs                      (tree, bool * = NULL);
7117 extern tree strip_typedefs_expr                 (tree, bool * = NULL);
7118 extern tree copy_binfo                          (tree, tree, tree,
7119                                                  tree *, int);
7120 extern int member_p                             (const_tree);
7121 extern cp_lvalue_kind real_lvalue_p             (const_tree);
7122 extern cp_lvalue_kind lvalue_kind               (const_tree);
7123 extern bool glvalue_p                           (const_tree);
7124 extern bool obvalue_p                           (const_tree);
7125 extern bool xvalue_p                            (const_tree);
7126 extern bool bitfield_p                          (const_tree);
7127 extern tree cp_stabilize_reference              (tree);
7128 extern bool builtin_valid_in_constant_expr_p    (const_tree);
7129 extern tree build_min                           (enum tree_code, tree, ...);
7130 extern tree build_min_nt_loc                    (location_t, enum tree_code,
7131                                                  ...);
7132 extern tree build_min_non_dep                   (enum tree_code, tree, ...);
7133 extern tree build_min_non_dep_op_overload       (enum tree_code, tree, tree, ...);
7134 extern tree build_min_nt_call_vec (tree, vec<tree, va_gc> *);
7135 extern tree build_min_non_dep_call_vec          (tree, tree, vec<tree, va_gc> *);
7136 extern vec<tree, va_gc>* vec_copy_and_insert    (vec<tree, va_gc>*, tree, unsigned);
7137 extern tree build_cplus_new                     (tree, tree, tsubst_flags_t);
7138 extern tree build_aggr_init_expr                (tree, tree);
7139 extern tree get_target_expr                     (tree);
7140 extern tree get_target_expr_sfinae              (tree, tsubst_flags_t);
7141 extern tree build_cplus_array_type              (tree, tree);
7142 extern tree build_array_of_n_type               (tree, int);
7143 extern bool array_of_runtime_bound_p            (tree);
7144 extern bool vla_type_p                          (tree);
7145 extern tree build_array_copy                    (tree);
7146 extern tree build_vec_init_expr                 (tree, tree, tsubst_flags_t);
7147 extern void diagnose_non_constexpr_vec_init     (tree);
7148 extern tree hash_tree_cons                      (tree, tree, tree);
7149 extern tree hash_tree_chain                     (tree, tree);
7150 extern tree build_qualified_name                (tree, tree, tree, bool);
7151 extern tree build_ref_qualified_type            (tree, cp_ref_qualifier);
7152 inline tree ovl_first                           (tree) ATTRIBUTE_PURE;
7153 extern tree ovl_make                            (tree fn,
7154                                                  tree next = NULL_TREE);
7155 extern tree ovl_insert                          (tree fn, tree maybe_ovl,
7156                                                  bool using_p = false);
7157 extern tree ovl_skip_hidden                     (tree) ATTRIBUTE_PURE;
7158 extern void lookup_mark                         (tree lookup, bool val);
7159 extern tree lookup_add                          (tree fns, tree lookup);
7160 extern tree lookup_maybe_add                    (tree fns, tree lookup,
7161                                                  bool deduping);
7162 extern void lookup_keep                         (tree lookup);
7163 extern int is_overloaded_fn                     (tree) ATTRIBUTE_PURE;
7164 extern bool really_overloaded_fn                (tree) ATTRIBUTE_PURE;
7165 extern tree dependent_name                      (tree);
7166 extern tree maybe_get_fns                       (tree) ATTRIBUTE_PURE;
7167 extern tree get_fns                             (tree) ATTRIBUTE_PURE;
7168 extern tree get_first_fn                        (tree) ATTRIBUTE_PURE;
7169 extern tree ovl_scope                           (tree);
7170 extern const char *cxx_printable_name           (tree, int);
7171 extern const char *cxx_printable_name_translate (tree, int);
7172 extern tree canonical_eh_spec                   (tree);
7173 extern tree build_cp_fntype_variant             (tree, cp_ref_qualifier, tree, bool);
7174 extern tree build_exception_variant             (tree, tree);
7175 extern tree bind_template_template_parm         (tree, tree);
7176 extern tree array_type_nelts_total              (tree);
7177 extern tree array_type_nelts_top                (tree);
7178 extern tree break_out_target_exprs              (tree, bool = false);
7179 extern tree build_ctor_subob_ref                (tree, tree, tree);
7180 extern tree replace_placeholders                (tree, tree, bool * = NULL);
7181 extern bool find_placeholders                   (tree);
7182 extern tree get_type_decl                       (tree);
7183 extern tree decl_namespace_context              (tree);
7184 extern bool decl_anon_ns_mem_p                  (const_tree);
7185 extern tree lvalue_type                         (tree);
7186 extern tree error_type                          (tree);
7187 extern int varargs_function_p                   (const_tree);
7188 extern bool cp_tree_equal                       (tree, tree);
7189 extern tree no_linkage_check                    (tree, bool);
7190 extern void debug_binfo                         (tree);
7191 extern tree build_dummy_object                  (tree);
7192 extern tree maybe_dummy_object                  (tree, tree *);
7193 extern int is_dummy_object                      (const_tree);
7194 extern const struct attribute_spec cxx_attribute_table[];
7195 extern tree make_ptrmem_cst                     (tree, tree);
7196 extern tree cp_build_type_attribute_variant     (tree, tree);
7197 extern tree cp_build_reference_type             (tree, bool);
7198 extern tree move                                (tree);
7199 extern tree cp_build_qualified_type_real        (tree, int, tsubst_flags_t);
7200 #define cp_build_qualified_type(TYPE, QUALS) \
7201   cp_build_qualified_type_real ((TYPE), (QUALS), tf_warning_or_error)
7202 extern bool cv_qualified_p                      (const_tree);
7203 extern tree cv_unqualified                      (tree);
7204 extern special_function_kind special_function_p (const_tree);
7205 extern int count_trees                          (tree);
7206 extern int char_type_p                          (tree);
7207 extern void verify_stmt_tree                    (tree);
7208 extern linkage_kind decl_linkage                (tree);
7209 extern duration_kind decl_storage_duration      (tree);
7210 extern tree cp_walk_subtrees (tree*, int*, walk_tree_fn,
7211                               void*, hash_set<tree> *);
7212 #define cp_walk_tree(tp,func,data,pset) \
7213         walk_tree_1 (tp, func, data, pset, cp_walk_subtrees)
7214 #define cp_walk_tree_without_duplicates(tp,func,data) \
7215         walk_tree_without_duplicates_1 (tp, func, data, cp_walk_subtrees)
7216 extern tree rvalue                              (tree);
7217 extern tree convert_bitfield_to_declared_type   (tree);
7218 extern tree cp_save_expr                        (tree);
7219 extern bool cast_valid_in_integral_constant_expression_p (tree);
7220 extern bool cxx_type_hash_eq                    (const_tree, const_tree);
7221 extern tree cxx_copy_lang_qualifiers            (const_tree, const_tree);
7222
7223 extern void cxx_print_statistics                (void);
7224 extern bool maybe_warn_zero_as_null_pointer_constant (tree, location_t);
7225
7226 /* in ptree.c */
7227 extern void cxx_print_xnode                     (FILE *, tree, int);
7228 extern void cxx_print_decl                      (FILE *, tree, int);
7229 extern void cxx_print_type                      (FILE *, tree, int);
7230 extern void cxx_print_identifier                (FILE *, tree, int);
7231 extern void cxx_print_error_function            (diagnostic_context *,
7232                                                  const char *,
7233                                                  struct diagnostic_info *);
7234
7235 /* in typeck.c */
7236 extern bool cxx_mark_addressable                (tree, bool = false);
7237 extern int string_conv_p                        (const_tree, const_tree, int);
7238 extern tree cp_truthvalue_conversion            (tree);
7239 extern tree condition_conversion                (tree);
7240 extern tree require_complete_type               (tree);
7241 extern tree require_complete_type_sfinae        (tree, tsubst_flags_t);
7242 extern tree complete_type                       (tree);
7243 extern tree complete_type_or_else               (tree, tree);
7244 extern tree complete_type_or_maybe_complain     (tree, tree, tsubst_flags_t);
7245 inline bool type_unknown_p                      (const_tree);
7246 enum { ce_derived, ce_type, ce_normal, ce_exact };
7247 extern bool comp_except_specs                   (const_tree, const_tree, int);
7248 extern bool comptypes                           (tree, tree, int);
7249 extern bool same_type_ignoring_top_level_qualifiers_p (tree, tree);
7250 extern bool compparms                           (const_tree, const_tree);
7251 extern int comp_cv_qualification                (const_tree, const_tree);
7252 extern int comp_cv_qualification                (int, int);
7253 extern int comp_cv_qual_signature               (tree, tree);
7254 extern tree cxx_sizeof_or_alignof_expr          (tree, enum tree_code, bool);
7255 extern tree cxx_sizeof_or_alignof_type          (tree, enum tree_code, bool, bool);
7256 extern tree cxx_alignas_expr                    (tree);
7257 extern tree cxx_sizeof_nowarn                   (tree);
7258 extern tree is_bitfield_expr_with_lowered_type  (const_tree);
7259 extern tree unlowered_expr_type                 (const_tree);
7260 extern tree decay_conversion                    (tree,
7261                                                  tsubst_flags_t,
7262                                                  bool = true);
7263 extern tree build_class_member_access_expr      (cp_expr, tree, tree, bool,
7264                                                  tsubst_flags_t);
7265 extern tree finish_class_member_access_expr     (cp_expr, tree, bool,
7266                                                  tsubst_flags_t);
7267 extern tree build_x_indirect_ref                (location_t, tree,
7268                                                  ref_operator, tsubst_flags_t);
7269 extern tree cp_build_indirect_ref               (tree, ref_operator,
7270                                                  tsubst_flags_t);
7271 extern tree cp_build_fold_indirect_ref          (tree);
7272 extern tree build_array_ref                     (location_t, tree, tree);
7273 extern tree cp_build_array_ref                  (location_t, tree, tree,
7274                                                  tsubst_flags_t);
7275 extern tree get_member_function_from_ptrfunc    (tree *, tree, tsubst_flags_t);
7276 extern tree cp_build_function_call_nary         (tree, tsubst_flags_t, ...)
7277                                                 ATTRIBUTE_SENTINEL;
7278 extern tree cp_build_function_call_vec          (tree, vec<tree, va_gc> **,
7279                                                  tsubst_flags_t);
7280 extern tree build_x_binary_op                   (location_t,
7281                                                  enum tree_code, tree,
7282                                                  enum tree_code, tree,
7283                                                  enum tree_code, tree *,
7284                                                  tsubst_flags_t);
7285 extern tree build_x_array_ref                   (location_t, tree, tree,
7286                                                  tsubst_flags_t);
7287 extern tree build_x_unary_op                    (location_t,
7288                                                  enum tree_code, cp_expr,
7289                                                  tsubst_flags_t);
7290 extern tree cp_build_addressof                  (location_t, tree,
7291                                                  tsubst_flags_t);
7292 extern tree cp_build_addr_expr                  (tree, tsubst_flags_t);
7293 extern tree cp_build_unary_op                   (enum tree_code, tree, bool,
7294                                                  tsubst_flags_t);
7295 extern tree genericize_compound_lvalue          (tree);
7296 extern tree unary_complex_lvalue                (enum tree_code, tree);
7297 extern tree build_x_conditional_expr            (location_t, tree, tree, tree,
7298                                                  tsubst_flags_t);
7299 extern tree build_x_compound_expr_from_list     (tree, expr_list_kind,
7300                                                  tsubst_flags_t);
7301 extern tree build_x_compound_expr_from_vec      (vec<tree, va_gc> *,
7302                                                  const char *, tsubst_flags_t);
7303 extern tree build_x_compound_expr               (location_t, tree, tree,
7304                                                  tsubst_flags_t);
7305 extern tree build_compound_expr                 (location_t, tree, tree);
7306 extern tree cp_build_compound_expr              (tree, tree, tsubst_flags_t);
7307 extern tree build_static_cast                   (tree, tree, tsubst_flags_t);
7308 extern tree build_reinterpret_cast              (tree, tree, tsubst_flags_t);
7309 extern tree build_const_cast                    (tree, tree, tsubst_flags_t);
7310 extern tree build_c_cast                        (location_t, tree, tree);
7311 extern cp_expr build_c_cast                     (location_t loc, tree type,
7312                                                  cp_expr expr);
7313 extern tree cp_build_c_cast                     (tree, tree, tsubst_flags_t);
7314 extern cp_expr build_x_modify_expr              (location_t, tree,
7315                                                  enum tree_code, tree,
7316                                                  tsubst_flags_t);
7317 extern tree cp_build_modify_expr                (location_t, tree,
7318                                                  enum tree_code, tree,
7319                                                  tsubst_flags_t);
7320 extern tree convert_for_initialization          (tree, tree, tree, int,
7321                                                  impl_conv_rhs, tree, int,
7322                                                  tsubst_flags_t);
7323 extern int comp_ptr_ttypes                      (tree, tree);
7324 extern bool comp_ptr_ttypes_const               (tree, tree);
7325 extern bool error_type_p                        (const_tree);
7326 extern bool ptr_reasonably_similar              (const_tree, const_tree);
7327 extern tree build_ptrmemfunc                    (tree, tree, int, bool,
7328                                                  tsubst_flags_t);
7329 extern int cp_type_quals                        (const_tree);
7330 extern int type_memfn_quals                     (const_tree);
7331 extern cp_ref_qualifier type_memfn_rqual        (const_tree);
7332 extern tree apply_memfn_quals                   (tree, cp_cv_quals,
7333                                                  cp_ref_qualifier = REF_QUAL_NONE);
7334 extern bool cp_has_mutable_p                    (const_tree);
7335 extern bool at_least_as_qualified_p             (const_tree, const_tree);
7336 extern void cp_apply_type_quals_to_decl         (int, tree);
7337 extern tree build_ptrmemfunc1                   (tree, tree, tree);
7338 extern void expand_ptrmemfunc_cst               (tree, tree *, tree *);
7339 extern tree type_after_usual_arithmetic_conversions (tree, tree);
7340 extern tree common_pointer_type                 (tree, tree);
7341 extern tree composite_pointer_type              (tree, tree, tree, tree,
7342                                                  composite_pointer_operation,
7343                                                  tsubst_flags_t);
7344 extern tree merge_types                         (tree, tree);
7345 extern tree strip_array_domain                  (tree);
7346 extern tree check_return_expr                   (tree, bool *);
7347 extern tree cp_build_binary_op                  (location_t,
7348                                                  enum tree_code, tree, tree,
7349                                                  tsubst_flags_t);
7350 extern tree build_x_vec_perm_expr               (location_t,
7351                                                  tree, tree, tree,
7352                                                  tsubst_flags_t);
7353 #define cxx_sizeof(T)  cxx_sizeof_or_alignof_type (T, SIZEOF_EXPR, false, true)
7354 extern tree build_simple_component_ref          (tree, tree);
7355 extern tree build_ptrmemfunc_access_expr        (tree, tree);
7356 extern tree build_address                       (tree);
7357 extern tree build_nop                           (tree, tree);
7358 extern tree non_reference                       (tree);
7359 extern tree lookup_anon_field                   (tree, tree);
7360 extern bool invalid_nonstatic_memfn_p           (location_t, tree,
7361                                                  tsubst_flags_t);
7362 extern tree convert_member_func_to_ptr          (tree, tree, tsubst_flags_t);
7363 extern tree convert_ptrmem                      (tree, tree, bool, bool,
7364                                                  tsubst_flags_t);
7365 extern int lvalue_or_else                       (tree, enum lvalue_use,
7366                                                  tsubst_flags_t);
7367 extern void check_template_keyword              (tree);
7368 extern bool check_raw_literal_operator          (const_tree decl);
7369 extern bool check_literal_operator_args         (const_tree, bool *, bool *);
7370 extern void maybe_warn_about_useless_cast       (tree, tree, tsubst_flags_t);
7371 extern tree cp_perform_integral_promotions      (tree, tsubst_flags_t);
7372
7373 extern tree finish_left_unary_fold_expr      (tree, int);
7374 extern tree finish_right_unary_fold_expr     (tree, int);
7375 extern tree finish_binary_fold_expr          (tree, tree, int);
7376 extern bool treat_lvalue_as_rvalue_p         (tree, bool);
7377
7378 /* in typeck2.c */
7379 extern void require_complete_eh_spec_types      (tree, tree);
7380 extern void cxx_incomplete_type_diagnostic      (location_t, const_tree,
7381                                                  const_tree, diagnostic_t);
7382
7383 inline location_t
7384 cp_expr_loc_or_loc (const_tree t, location_t or_loc)
7385 {
7386   location_t loc = cp_expr_location (t);
7387   if (loc == UNKNOWN_LOCATION)
7388     loc = or_loc;
7389   return loc;
7390 }
7391
7392 inline void
7393 cxx_incomplete_type_diagnostic (const_tree value, const_tree type,
7394                                 diagnostic_t diag_kind)
7395 {
7396   cxx_incomplete_type_diagnostic (cp_expr_loc_or_loc (value, input_location),
7397                                   value, type, diag_kind);
7398 }
7399
7400 extern void cxx_incomplete_type_error           (location_t, const_tree,
7401                                                  const_tree);
7402 inline void
7403 cxx_incomplete_type_error (const_tree value, const_tree type)
7404 {
7405   cxx_incomplete_type_diagnostic (value, type, DK_ERROR);
7406 }
7407
7408 extern void cxx_incomplete_type_inform          (const_tree);
7409 extern tree error_not_base_type                 (tree, tree);
7410 extern tree binfo_or_else                       (tree, tree);
7411 extern void cxx_readonly_error                  (location_t, tree,
7412                                                  enum lvalue_use);
7413 extern void complete_type_check_abstract        (tree);
7414 extern int abstract_virtuals_error              (tree, tree);
7415 extern int abstract_virtuals_error              (abstract_class_use, tree);
7416 extern int abstract_virtuals_error_sfinae       (tree, tree, tsubst_flags_t);
7417 extern int abstract_virtuals_error_sfinae       (abstract_class_use, tree, tsubst_flags_t);
7418
7419 extern tree store_init_value                    (tree, tree, vec<tree, va_gc>**, int);
7420 extern tree split_nonconstant_init              (tree, tree);
7421 extern bool check_narrowing                     (tree, tree, tsubst_flags_t,
7422                                                  bool = false);
7423 extern tree digest_init                         (tree, tree, tsubst_flags_t);
7424 extern tree digest_init_flags                   (tree, tree, int, tsubst_flags_t);
7425 extern tree digest_nsdmi_init                   (tree, tree, tsubst_flags_t);
7426 extern tree build_scoped_ref                    (tree, tree, tree *);
7427 extern tree build_x_arrow                       (location_t, tree,
7428                                                  tsubst_flags_t);
7429 extern tree build_m_component_ref               (tree, tree, tsubst_flags_t);
7430 extern tree build_functional_cast               (tree, tree, tsubst_flags_t);
7431 extern tree add_exception_specifier             (tree, tree, tsubst_flags_t);
7432 extern tree merge_exception_specifiers          (tree, tree);
7433
7434 /* in mangle.c */
7435 extern void init_mangle                         (void);
7436 extern void mangle_decl                         (tree);
7437 extern const char *mangle_type_string           (tree);
7438 extern tree mangle_typeinfo_for_type            (tree);
7439 extern tree mangle_typeinfo_string_for_type     (tree);
7440 extern tree mangle_vtbl_for_type                (tree);
7441 extern tree mangle_vtt_for_type                 (tree);
7442 extern tree mangle_ctor_vtbl_for_type           (tree, tree);
7443 extern tree mangle_thunk                        (tree, int, tree, tree, tree);
7444 extern tree mangle_guard_variable               (tree);
7445 extern tree mangle_tls_init_fn                  (tree);
7446 extern tree mangle_tls_wrapper_fn               (tree);
7447 extern bool decl_tls_wrapper_p                  (tree);
7448 extern tree mangle_ref_init_variable            (tree);
7449 extern char * get_mangled_vtable_map_var_name   (tree);
7450 extern bool mangle_return_type_p                (tree);
7451 extern tree mangle_decomp                       (tree, vec<tree> &);
7452
7453 /* in dump.c */
7454 extern bool cp_dump_tree                        (void *, tree);
7455
7456 /* In cp/cp-objcp-common.c.  */
7457
7458 extern alias_set_type cxx_get_alias_set         (tree);
7459 extern bool cxx_warn_unused_global_decl         (const_tree);
7460 extern size_t cp_tree_size                      (enum tree_code);
7461 extern bool cp_var_mod_type_p                   (tree, tree);
7462 extern void cxx_initialize_diagnostics          (diagnostic_context *);
7463 extern int cxx_types_compatible_p               (tree, tree);
7464 extern bool cxx_block_may_fallthru              (const_tree);
7465
7466 /* in cp-gimplify.c */
7467 extern int cp_gimplify_expr                     (tree *, gimple_seq *,
7468                                                  gimple_seq *);
7469 extern void cp_genericize                       (tree);
7470 extern bool cxx_omp_const_qual_no_mutable       (tree);
7471 extern enum omp_clause_default_kind cxx_omp_predetermined_sharing_1 (tree);
7472 extern enum omp_clause_default_kind cxx_omp_predetermined_sharing (tree);
7473 extern tree cxx_omp_clause_default_ctor         (tree, tree, tree);
7474 extern tree cxx_omp_clause_copy_ctor            (tree, tree, tree);
7475 extern tree cxx_omp_clause_assign_op            (tree, tree, tree);
7476 extern tree cxx_omp_clause_dtor                 (tree, tree);
7477 extern void cxx_omp_finish_clause               (tree, gimple_seq *);
7478 extern bool cxx_omp_privatize_by_reference      (const_tree);
7479 extern bool cxx_omp_disregard_value_expr        (tree, bool);
7480 extern void cp_fold_function                    (tree);
7481 extern tree cp_fully_fold                       (tree);
7482 extern void clear_fold_cache                    (void);
7483
7484 /* in name-lookup.c */
7485 extern tree strip_using_decl                    (tree);
7486
7487 /* Tell the binding oracle what kind of binding we are looking for.  */
7488
7489 enum cp_oracle_request
7490 {
7491   CP_ORACLE_IDENTIFIER
7492 };
7493
7494 /* If this is non-NULL, then it is a "binding oracle" which can lazily
7495    create bindings when needed by the C compiler.  The oracle is told
7496    the name and type of the binding to create.  It can call pushdecl
7497    or the like to ensure the binding is visible; or do nothing,
7498    leaving the binding untouched.  c-decl.c takes note of when the
7499    oracle has been called and will not call it again if it fails to
7500    create a given binding.  */
7501
7502 typedef void cp_binding_oracle_function (enum cp_oracle_request, tree identifier);
7503
7504 extern cp_binding_oracle_function *cp_binding_oracle;
7505
7506 /* in constraint.cc */
7507 extern void init_constraint_processing          ();
7508 extern bool constraint_p                        (tree);
7509 extern tree conjoin_constraints                 (tree, tree);
7510 extern tree conjoin_constraints                 (tree);
7511 extern tree get_constraints                     (tree);
7512 extern void set_constraints                     (tree, tree);
7513 extern void remove_constraints                  (tree);
7514 extern tree current_template_constraints        (void);
7515 extern tree associate_classtype_constraints     (tree);
7516 extern tree build_constraints                   (tree, tree);
7517 extern tree get_shorthand_constraints           (tree);
7518 extern tree build_concept_check                 (tree, tree, tree = NULL_TREE);
7519 extern tree build_constrained_parameter         (tree, tree, tree = NULL_TREE);
7520 extern tree make_constrained_auto               (tree, tree);
7521 extern void placeholder_extract_concept_and_args (tree, tree&, tree&);
7522 extern bool equivalent_placeholder_constraints  (tree, tree);
7523 extern hashval_t hash_placeholder_constraint    (tree);
7524 extern bool deduce_constrained_parameter        (tree, tree&, tree&);
7525 extern tree resolve_constraint_check            (tree);
7526 extern tree check_function_concept              (tree);
7527 extern tree finish_template_introduction        (tree, tree);
7528 extern bool valid_requirements_p                (tree);
7529 extern tree finish_concept_name                 (tree);
7530 extern tree finish_shorthand_constraint         (tree, tree);
7531 extern tree finish_requires_expr                (tree, tree);
7532 extern tree finish_simple_requirement           (tree);
7533 extern tree finish_type_requirement             (tree);
7534 extern tree finish_compound_requirement         (tree, tree, bool);
7535 extern tree finish_nested_requirement           (tree);
7536 extern void check_constrained_friend            (tree, tree);
7537 extern tree tsubst_requires_expr                (tree, tree, tsubst_flags_t, tree);
7538 extern tree tsubst_constraint                   (tree, tree, tsubst_flags_t, tree);
7539 extern tree tsubst_constraint_info              (tree, tree, tsubst_flags_t, tree);
7540 extern bool function_concept_check_p            (tree);
7541 extern tree normalize_expression                (tree);
7542 extern tree expand_concept                      (tree, tree);
7543 extern bool expanding_concept                   ();
7544 extern tree evaluate_constraints                (tree, tree);
7545 extern tree evaluate_function_concept           (tree, tree);
7546 extern tree evaluate_variable_concept           (tree, tree);
7547 extern tree evaluate_constraint_expression      (tree, tree);
7548 extern bool constraints_satisfied_p             (tree);
7549 extern bool constraints_satisfied_p             (tree, tree);
7550 extern tree lookup_constraint_satisfaction      (tree, tree);
7551 extern tree memoize_constraint_satisfaction     (tree, tree, tree);
7552 extern tree lookup_concept_satisfaction         (tree, tree);
7553 extern tree memoize_concept_satisfaction        (tree, tree, tree);
7554 extern tree get_concept_expansion               (tree, tree);
7555 extern tree save_concept_expansion              (tree, tree, tree);
7556 extern bool* lookup_subsumption_result          (tree, tree);
7557 extern bool save_subsumption_result             (tree, tree, bool);
7558
7559 extern bool equivalent_constraints              (tree, tree);
7560 extern bool equivalently_constrained            (tree, tree);
7561 extern bool subsumes_constraints                (tree, tree);
7562 extern bool strictly_subsumes                   (tree, tree);
7563 extern int more_constrained                     (tree, tree);
7564
7565 extern void diagnose_constraints                (location_t, tree, tree);
7566
7567 /* in logic.cc */
7568 extern tree decompose_conclusions               (tree);
7569 extern bool subsumes                            (tree, tree);
7570
7571 /* In class.c */
7572 extern void cp_finish_injected_record_type (tree);
7573
7574 /* in vtable-class-hierarchy.c */
7575 extern void vtv_compute_class_hierarchy_transitive_closure (void);
7576 extern void vtv_generate_init_routine           (void);
7577 extern void vtv_save_class_info                 (tree);
7578 extern void vtv_recover_class_info              (void);
7579 extern void vtv_build_vtable_verify_fndecl      (void);
7580
7581 /* In constexpr.c */
7582 extern void fini_constexpr                      (void);
7583 extern bool literal_type_p                      (tree);
7584 extern tree register_constexpr_fundef           (tree, tree);
7585 extern bool is_valid_constexpr_fn               (tree, bool);
7586 extern bool check_constexpr_ctor_body           (tree, tree, bool);
7587 extern tree constexpr_fn_retval         (tree);
7588 extern tree ensure_literal_type_for_constexpr_object (tree);
7589 extern bool potential_constant_expression       (tree);
7590 extern bool is_constant_expression (tree);
7591 extern bool is_nondependent_constant_expression (tree);
7592 extern bool is_nondependent_static_init_expression (tree);
7593 extern bool is_static_init_expression    (tree);
7594 extern bool potential_rvalue_constant_expression (tree);
7595 extern bool require_potential_constant_expression (tree);
7596 extern bool require_constant_expression (tree);
7597 extern bool require_rvalue_constant_expression (tree);
7598 extern bool require_potential_rvalue_constant_expression (tree);
7599 extern tree cxx_constant_value                  (tree, tree = NULL_TREE);
7600 extern tree cxx_constant_init                   (tree, tree = NULL_TREE);
7601 extern tree maybe_constant_value                (tree, tree = NULL_TREE);
7602 extern tree maybe_constant_init                 (tree, tree = NULL_TREE, bool = false);
7603 extern tree fold_non_dependent_expr             (tree, tsubst_flags_t = tf_warning_or_error);
7604 extern tree fold_simple                         (tree);
7605 extern bool is_sub_constant_expr                (tree);
7606 extern bool reduced_constant_expression_p       (tree);
7607 extern bool is_instantiation_of_constexpr       (tree);
7608 extern bool var_in_constexpr_fn                 (tree);
7609 extern bool var_in_maybe_constexpr_fn           (tree);
7610 extern void explain_invalid_constexpr_fn        (tree);
7611 extern vec<tree> cx_error_context               (void);
7612 extern tree fold_sizeof_expr                    (tree);
7613 extern void clear_cv_and_fold_caches            (void);
7614
7615 /* In cp-ubsan.c */
7616 extern void cp_ubsan_maybe_instrument_member_call (tree);
7617 extern void cp_ubsan_instrument_member_accesses (tree *);
7618 extern tree cp_ubsan_maybe_instrument_downcast  (location_t, tree, tree, tree);
7619 extern tree cp_ubsan_maybe_instrument_cast_to_vbase (location_t, tree, tree);
7620 extern void cp_ubsan_maybe_initialize_vtbl_ptrs (tree);
7621
7622 /* Inline bodies.  */
7623
7624 inline tree
7625 ovl_first (tree node)
7626 {
7627   while (TREE_CODE (node) == OVERLOAD)
7628     node = OVL_FUNCTION (node);
7629   return node;
7630 }
7631
7632 inline bool
7633 type_unknown_p (const_tree expr)
7634 {
7635   return TREE_TYPE (expr) == unknown_type_node;
7636 }
7637
7638 inline hashval_t
7639 named_decl_hash::hash (const value_type decl)
7640 {
7641   tree name = OVL_NAME (decl);
7642   return name ? IDENTIFIER_HASH_VALUE (name) : 0;
7643 }
7644
7645 inline bool
7646 named_decl_hash::equal (const value_type existing, compare_type candidate)
7647 {
7648   tree name = OVL_NAME (existing);
7649   return candidate == name;
7650 }
7651
7652 inline bool
7653 null_node_p (const_tree expr)
7654 {
7655   STRIP_ANY_LOCATION_WRAPPER (expr);
7656   return expr == null_node;
7657 }
7658
7659 #if CHECKING_P
7660 namespace selftest {
7661   extern void run_cp_tests (void);
7662
7663   /* Declarations for specific families of tests within cp,
7664      by source file, in alphabetical order.  */
7665   extern void cp_pt_c_tests ();
7666   extern void cp_tree_c_tests (void);
7667 } // namespace selftest
7668 #endif /* #if CHECKING_P */
7669
7670 /* -- end of C++ */
7671
7672 #endif /* ! GCC_CP_TREE_H */