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
 710 /* The first decl of an overload.  */
 711 #define OVL_FIRST(NODE) ovl_first (NODE)
 712 /* The name of the overload set.  */
 713 #define OVL_NAME(NODE) DECL_NAME (OVL_FIRST (NODE))
 714
 715 /* Whether this is a set of overloaded functions.  TEMPLATE_DECLS are
 716    always wrapped in an OVERLOAD, so we don't need to check them
 717    here.  */
 718 #define OVL_P(NODE) \
 719   (TREE_CODE (NODE) == FUNCTION_DECL || TREE_CODE (NODE) == OVERLOAD)
 720 /* Whether this is a single member overload.  */
 721 #define OVL_SINGLE_P(NODE) \
 722   (TREE_CODE (NODE) != OVERLOAD || !OVL_CHAIN (NODE))
 723
 724 /* OVL_HIDDEN_P nodes come before other nodes.  */
 725
 726 struct GTY(()) tree_overload {
 727   struct tree_common common;
 728   tree function;
 729 };
 730
 731 /* Iterator for a 1 dimensional overload.  Permits iterating over the
 732    outer level of a 2-d overload when explicitly enabled.  */
 733
 734 class ovl_iterator
 735 {
 736   tree ovl;
 737   const bool allow_inner; /* Only used when checking.  */
 738
 739  public:
 740   explicit ovl_iterator (tree o, bool allow = false)
 741     : ovl (o), allow_inner (allow)
 742   {
 743   }
 744
 745  private:
 746   /* Do not duplicate.  */
 747   ovl_iterator &operator= (const ovl_iterator &);
 748   ovl_iterator (const ovl_iterator &);
 749
 750  public:
 751   operator bool () const
 752   {
 753     return ovl;
 754   }
 755   ovl_iterator &operator++ ()
 756   {
 757     ovl = TREE_CODE (ovl) != OVERLOAD ? NULL_TREE : OVL_CHAIN (ovl);
 758     return *this;
 759   }
 760   tree operator* () const
 761   {
 762     tree fn = TREE_CODE (ovl) != OVERLOAD ? ovl : OVL_FUNCTION (ovl);
 763
 764     /* Check this is not an unexpected 2-dimensional overload.  */
 765     gcc_checking_assert (allow_inner || TREE_CODE (fn) != OVERLOAD);
 766
 767     return fn;
 768   }
 769
 770  public:
 771   /* Whether this overload was introduced by a using decl.  */
 772   bool using_p () const
 773   {
 774     return TREE_CODE (ovl) == OVERLOAD && OVL_USING_P (ovl);
 775   }
 776   bool hidden_p () const
 777   {
 778     return TREE_CODE (ovl) == OVERLOAD && OVL_HIDDEN_P (ovl);
 779   }
 780
 781  public:
 782   tree remove_node (tree head)
 783   {
 784     return remove_node (head, ovl);
 785   }
 786   tree reveal_node (tree head)
 787   {
 788     return reveal_node (head, ovl);
 789   }
 790
 791  protected:
 792   /* If we have a nested overload, point at the inner overload and
 793      return the next link on the outer one.  */
 794   tree maybe_push ()
 795   {
 796     tree r = NULL_TREE;
 797
 798     if (ovl && TREE_CODE (ovl) == OVERLOAD && OVL_NESTED_P (ovl))
 799       {
 800         r = OVL_CHAIN (ovl);
 801         ovl = OVL_FUNCTION (ovl);
 802       }
 803     return r;
 804   }
 805   /* Restore an outer nested overload.  */
 806   void pop (tree outer)
 807   {
 808     gcc_checking_assert (!ovl);
 809     ovl = outer;
 810   }
 811
 812  private:
 813   /* We make these static functions to avoid the address of the
 814      iterator escaping the local context.  */
 815   static tree remove_node (tree head, tree node);
 816   static tree reveal_node (tree ovl, tree node);
 817 };
 818
 819 /* Iterator over a (potentially) 2 dimensional overload, which is
 820    produced by name lookup.  */
 821
 822 class lkp_iterator : public ovl_iterator
 823 {
 824   typedef ovl_iterator parent;
 825
 826   tree outer;
 827
 828  public:
 829   explicit lkp_iterator (tree o)
 830     : parent (o, true), outer (maybe_push ())
 831   {
 832   }
 833
 834  public:
 835   lkp_iterator &operator++ ()
 836   {
 837     bool repush = !outer;
 838
 839     if (!parent::operator++ () && !repush)
 840       {
 841         pop (outer);
 842         repush = true;
 843       }
 844
 845     if (repush)
 846       outer = maybe_push ();
 847
 848     return *this;
 849   }
 850 };
 851
 852 /* hash traits for declarations.  Hashes potential overload sets via
 853    DECL_NAME.  */
 854
 855 struct named_decl_hash : ggc_remove <tree>
 856 {
 857   typedef tree value_type; /* A DECL or OVERLOAD  */
 858   typedef tree compare_type; /* An identifier.  */
 859
 860   inline static hashval_t hash (const value_type decl);
 861   inline static bool equal (const value_type existing, compare_type candidate);
 862
 863   static inline void mark_empty (value_type &p) {p = NULL_TREE;}
 864   static inline bool is_empty (value_type p) {return !p;}
 865
 866   /* Nothing is deletable.  Everything is insertable.  */
 867   static bool is_deleted (value_type) { return false; }
 868   static void mark_deleted (value_type) { gcc_unreachable (); }
 869 };
 870
 871 /* Simplified unique_ptr clone to release a tree vec on exit.  */
 872
 873 struct releasing_vec
 874 {
 875   typedef vec<tree, va_gc> vec_t;
 876
 877   releasing_vec (vec_t *v): v(v) { }
 878   releasing_vec (): v(make_tree_vector ()) { }
 879
 880   /* Copy ops are deliberately declared but not defined,
 881      copies must always be elided.  */
 882   releasing_vec (const releasing_vec &);
 883   releasing_vec &operator= (const releasing_vec &);
 884
 885   vec_t &operator* () const { return *v; }
 886   vec_t *operator-> () const { return v; }
 887   vec_t *get() const { return v; }
 888   operator vec_t *() const { return v; }
 889   tree& operator[] (unsigned i) const { return (*v)[i]; }
 890
 891   /* Necessary for use with vec** and vec*& interfaces.  */
 892   vec_t *&get_ref () { return v; }
 893
 894   ~releasing_vec() { release_tree_vector (v); }
 895 private:
 896   vec_t *v;
 897 };
 898
 899 struct GTY(()) tree_template_decl {
 900   struct tree_decl_common common;
 901   tree arguments;
 902   tree result;
 903 };
 904
 905 /* Returns true iff NODE is a BASELINK.  */
 906 #define BASELINK_P(NODE) \
 907   (TREE_CODE (NODE) == BASELINK)
 908 /* The BINFO indicating the base in which lookup found the
 909    BASELINK_FUNCTIONS.  */
 910 #define BASELINK_BINFO(NODE) \
 911   (((struct tree_baselink*) BASELINK_CHECK (NODE))->binfo)
 912 /* The functions referred to by the BASELINK; either a FUNCTION_DECL,
 913    a TEMPLATE_DECL, an OVERLOAD, or a TEMPLATE_ID_EXPR.  */
 914 #define BASELINK_FUNCTIONS(NODE) \
 915   (((struct tree_baselink*) BASELINK_CHECK (NODE))->functions)
 916 /* If T is a BASELINK, grab the functions, otherwise just T, which is
 917    expected to already be a (list of) functions.  */
 918 #define MAYBE_BASELINK_FUNCTIONS(T) \
 919   (BASELINK_P (T) ? BASELINK_FUNCTIONS (T) : T)
 920 /* The BINFO in which the search for the functions indicated by this baselink
 921    began.  This base is used to determine the accessibility of functions
 922    selected by overload resolution.  */
 923 #define BASELINK_ACCESS_BINFO(NODE) \
 924   (((struct tree_baselink*) BASELINK_CHECK (NODE))->access_binfo)
 925 /* For a type-conversion operator, the BASELINK_OPTYPE indicates the type
 926    to which the conversion should occur.  This value is important if
 927    the BASELINK_FUNCTIONS include a template conversion operator --
 928    the BASELINK_OPTYPE can be used to determine what type the user
 929    requested.  */
 930 #define BASELINK_OPTYPE(NODE) \
 931   (TREE_CHAIN (BASELINK_CHECK (NODE)))
 932 /* Nonzero if this baselink was from a qualified lookup.  */
 933 #define BASELINK_QUALIFIED_P(NODE) \
 934   TREE_LANG_FLAG_0 (BASELINK_CHECK (NODE))
 935
 936 struct GTY(()) tree_baselink {
 937   struct tree_common common;
 938   tree binfo;
 939   tree functions;
 940   tree access_binfo;
 941 };
 942
 943 /* The different kinds of ids that we encounter.  */
 944
 945 enum cp_id_kind
 946 {
 947   /* Not an id at all.  */
 948   CP_ID_KIND_NONE,
 949   /* An unqualified-id that is not a template-id.  */
 950   CP_ID_KIND_UNQUALIFIED,
 951   /* An unqualified-id that is a dependent name.  */
 952   CP_ID_KIND_UNQUALIFIED_DEPENDENT,
 953   /* An unqualified template-id.  */
 954   CP_ID_KIND_TEMPLATE_ID,
 955   /* A qualified-id.  */
 956   CP_ID_KIND_QUALIFIED
 957 };
 958
 959
 960 /* The various kinds of C++0x warnings we encounter. */
 961
 962 enum cpp0x_warn_str
 963 {
 964   /* extended initializer lists */
 965   CPP0X_INITIALIZER_LISTS,
 966   /* explicit conversion operators */
 967   CPP0X_EXPLICIT_CONVERSION,
 968   /* variadic templates */
 969   CPP0X_VARIADIC_TEMPLATES,
 970   /* lambda expressions */
 971   CPP0X_LAMBDA_EXPR,
 972   /* C++0x auto */
 973   CPP0X_AUTO,
 974   /* scoped enums */
 975   CPP0X_SCOPED_ENUMS,
 976   /* defaulted and deleted functions */
 977   CPP0X_DEFAULTED_DELETED,
 978   /* inline namespaces */
 979   CPP0X_INLINE_NAMESPACES,
 980   /* override controls, override/final */
 981   CPP0X_OVERRIDE_CONTROLS,
 982   /* non-static data member initializers */
 983   CPP0X_NSDMI,
 984   /* user defined literals */
 985   CPP0X_USER_DEFINED_LITERALS,
 986   /* delegating constructors */
 987   CPP0X_DELEGATING_CTORS,
 988   /* inheriting constructors */
 989   CPP0X_INHERITING_CTORS,
 990   /* C++11 attributes */
 991   CPP0X_ATTRIBUTES,
 992   /* ref-qualified member functions */
 993   CPP0X_REF_QUALIFIER
 994 };
 995
 996 /* The various kinds of operation used by composite_pointer_type. */
 997
 998 enum composite_pointer_operation
 999 {
1000   /* comparison */
1001   CPO_COMPARISON,
1002   /* conversion */
1003   CPO_CONVERSION,
1004   /* conditional expression */
1005   CPO_CONDITIONAL_EXPR
1006 };
1007
1008 /* Possible cases of expression list used by build_x_compound_expr_from_list. */
1009 enum expr_list_kind {
1010   ELK_INIT,             /* initializer */
1011   ELK_MEM_INIT,         /* member initializer */
1012   ELK_FUNC_CAST         /* functional cast */
1013 };
1014
1015 /* Possible cases of implicit bad rhs conversions. */
1016 enum impl_conv_rhs {
1017   ICR_DEFAULT_ARGUMENT, /* default argument */
1018   ICR_CONVERTING,       /* converting */
1019   ICR_INIT,             /* initialization */
1020   ICR_ARGPASS,          /* argument passing */
1021   ICR_RETURN,           /* return */
1022   ICR_ASSIGN            /* assignment */
1023 };
1024
1025 /* Possible cases of implicit or explicit bad conversions to void. */
1026 enum impl_conv_void {
1027   ICV_CAST,            /* (explicit) conversion to void */
1028   ICV_SECOND_OF_COND,  /* second operand of conditional expression */
1029   ICV_THIRD_OF_COND,   /* third operand of conditional expression */
1030   ICV_RIGHT_OF_COMMA,  /* right operand of comma operator */
1031   ICV_LEFT_OF_COMMA,   /* left operand of comma operator */
1032   ICV_STATEMENT,       /* statement */
1033   ICV_THIRD_IN_FOR     /* for increment expression */
1034 };
1035
1036 /* Possible invalid uses of an abstract class that might not have a
1037    specific associated declaration.  */
1038 enum GTY(()) abstract_class_use {
1039   ACU_UNKNOWN,                  /* unknown or decl provided */
1040   ACU_CAST,                     /* cast to abstract class */
1041   ACU_NEW,                      /* new-expression of abstract class */
1042   ACU_THROW,                    /* throw-expression of abstract class */
1043   ACU_CATCH,                    /* catch-parameter of abstract class */
1044   ACU_ARRAY,                    /* array of abstract class */
1045   ACU_RETURN,                   /* return type of abstract class */
1046   ACU_PARM                      /* parameter type of abstract class */
1047 };
1048
1049 /* Macros for access to language-specific slots in an identifier.  */
1050
1051 /* The IDENTIFIER_BINDING is the innermost cxx_binding for the
1052     identifier.  Its PREVIOUS is the next outermost binding.  Each
1053     VALUE field is a DECL for the associated declaration.  Thus,
1054     name lookup consists simply of pulling off the node at the front
1055     of the list (modulo oddities for looking up the names of types,
1056     and such.)  You can use SCOPE field to determine the scope
1057     that bound the name.  */
1058 #define IDENTIFIER_BINDING(NODE) \
1059   (LANG_IDENTIFIER_CAST (NODE)->bindings)
1060
1061 /* TREE_TYPE only indicates on local and class scope the current
1062    type. For namespace scope, the presence of a type in any namespace
1063    is indicated with global_type_node, and the real type behind must
1064    be found through lookup.  */
1065 #define IDENTIFIER_TYPE_VALUE(NODE) identifier_type_value (NODE)
1066 #define REAL_IDENTIFIER_TYPE_VALUE(NODE) TREE_TYPE (NODE)
1067 #define SET_IDENTIFIER_TYPE_VALUE(NODE,TYPE) (TREE_TYPE (NODE) = (TYPE))
1068 #define IDENTIFIER_HAS_TYPE_VALUE(NODE) (IDENTIFIER_TYPE_VALUE (NODE) ? 1 : 0)
1069
1070 /* Kinds of identifiers.  Values are carefully chosen.  */
1071 enum cp_identifier_kind {
1072   cik_normal = 0,       /* Not a special identifier.  */
1073   cik_keyword = 1,      /* A keyword.  */
1074   cik_ctor = 2,         /* Constructor (in-chg, complete or base).  */
1075   cik_dtor = 3,         /* Destructor (in-chg, deleting, complete or
1076                            base).  */
1077   cik_simple_op = 4,    /* Non-assignment operator name.  */
1078   cik_assign_op = 5,    /* An assignment operator name.  */
1079   cik_conv_op = 6,      /* Conversion operator name.  */
1080   cik_reserved_for_udlit = 7,   /* Not yet in use  */
1081   cik_max
1082 };
1083
1084 /* Kind bits.  */
1085 #define IDENTIFIER_KIND_BIT_0(NODE) \
1086   TREE_LANG_FLAG_0 (IDENTIFIER_NODE_CHECK (NODE))
1087 #define IDENTIFIER_KIND_BIT_1(NODE) \
1088   TREE_LANG_FLAG_1 (IDENTIFIER_NODE_CHECK (NODE))
1089 #define IDENTIFIER_KIND_BIT_2(NODE) \
1090   TREE_LANG_FLAG_2 (IDENTIFIER_NODE_CHECK (NODE))
1091
1092 /* Used by various search routines.  */
1093 #define IDENTIFIER_MARKED(NODE) \
1094   TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (NODE))
1095
1096 /* Nonzero if this identifier is used as a virtual function name somewhere
1097    (optimizes searches).  */
1098 #define IDENTIFIER_VIRTUAL_P(NODE) \
1099   TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (NODE))
1100
1101 /* True iff NAME is the DECL_ASSEMBLER_NAME for an entity with vague
1102    linkage which the prelinker has assigned to this translation
1103    unit.  */
1104 #define IDENTIFIER_REPO_CHOSEN(NAME) \
1105   (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (NAME)))
1106
1107 /* True if this identifier is a reserved word.  C_RID_CODE (node) is
1108    then the RID_* value of the keyword.  Value 1.  */
1109 #define IDENTIFIER_KEYWORD_P(NODE)              \
1110   ((!IDENTIFIER_KIND_BIT_2 (NODE))              \
1111    & (!IDENTIFIER_KIND_BIT_1 (NODE))            \
1112    & IDENTIFIER_KIND_BIT_0 (NODE))
1113
1114 /* True if this identifier is the name of a constructor or
1115    destructor.  Value 2 or 3.  */
1116 #define IDENTIFIER_CDTOR_P(NODE)                \
1117   ((!IDENTIFIER_KIND_BIT_2 (NODE))              \
1118    & IDENTIFIER_KIND_BIT_1 (NODE))
1119
1120 /* True if this identifier is the name of a constructor.  Value 2.  */
1121 #define IDENTIFIER_CTOR_P(NODE)                 \
1122   (IDENTIFIER_CDTOR_P(NODE)                     \
1123     & (!IDENTIFIER_KIND_BIT_0 (NODE)))
1124
1125 /* True if this identifier is the name of a destructor.  Value 3.  */
1126 #define IDENTIFIER_DTOR_P(NODE)                 \
1127   (IDENTIFIER_CDTOR_P(NODE)                     \
1128     & IDENTIFIER_KIND_BIT_0 (NODE))
1129
1130 /* True if this identifier is for any operator name (including
1131    conversions).  Value 4, 5, 6 or 7.  */
1132 #define IDENTIFIER_ANY_OP_P(NODE)               \
1133   (IDENTIFIER_KIND_BIT_2 (NODE))
1134
1135 /* True if this identifier is for an overloaded operator. Values 4, 5.  */
1136 #define IDENTIFIER_OVL_OP_P(NODE)               \
1137   (IDENTIFIER_ANY_OP_P (NODE)                   \
1138    & (!IDENTIFIER_KIND_BIT_1 (NODE)))
1139
1140 /* True if this identifier is for any assignment. Values 5.  */
1141 #define IDENTIFIER_ASSIGN_OP_P(NODE)            \
1142   (IDENTIFIER_OVL_OP_P (NODE)                   \
1143    & IDENTIFIER_KIND_BIT_0 (NODE))
1144
1145 /* True if this identifier is the name of a type-conversion
1146    operator.  Value 7.  */
1147 #define IDENTIFIER_CONV_OP_P(NODE)              \
1148   (IDENTIFIER_ANY_OP_P (NODE)                   \
1149    & IDENTIFIER_KIND_BIT_1 (NODE)               \
1150    & (!IDENTIFIER_KIND_BIT_0 (NODE)))
1151
1152 /* True if this identifier is a new or delete operator.  */
1153 #define IDENTIFIER_NEWDEL_OP_P(NODE)            \
1154   (IDENTIFIER_OVL_OP_P (NODE)                   \
1155    && IDENTIFIER_OVL_OP_FLAGS (NODE) & OVL_OP_FLAG_ALLOC)
1156
1157 /* True if this identifier is a new operator.  */
1158 #define IDENTIFIER_NEW_OP_P(NODE)                                       \
1159   (IDENTIFIER_OVL_OP_P (NODE)                                           \
1160    && (IDENTIFIER_OVL_OP_FLAGS (NODE)                                   \
1161        & (OVL_OP_FLAG_ALLOC | OVL_OP_FLAG_DELETE)) == OVL_OP_FLAG_ALLOC)
1162
1163 /* Access a C++-specific index for identifier NODE.
1164    Used to optimize operator mappings etc.  */
1165 #define IDENTIFIER_CP_INDEX(NODE)               \
1166   (IDENTIFIER_NODE_CHECK(NODE)->base.u.bits.address_space)
1167
1168 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
1169 #define C_TYPE_FIELDS_READONLY(TYPE) \
1170   (LANG_TYPE_CLASS_CHECK (TYPE)->fields_readonly)
1171
1172 /* The tokens stored in the default argument.  */
1173
1174 #define DEFARG_TOKENS(NODE) \
1175   (((struct tree_default_arg *)DEFAULT_ARG_CHECK (NODE))->tokens)
1176 #define DEFARG_INSTANTIATIONS(NODE) \
1177   (((struct tree_default_arg *)DEFAULT_ARG_CHECK (NODE))->instantiations)
1178
1179 struct GTY (()) tree_default_arg {
1180   struct tree_common common;
1181   struct cp_token_cache *tokens;
1182   vec<tree, va_gc> *instantiations;
1183 };
1184
1185
1186 #define DEFERRED_NOEXCEPT_PATTERN(NODE) \
1187   (((struct tree_deferred_noexcept *)DEFERRED_NOEXCEPT_CHECK (NODE))->pattern)
1188 #define DEFERRED_NOEXCEPT_ARGS(NODE) \
1189   (((struct tree_deferred_noexcept *)DEFERRED_NOEXCEPT_CHECK (NODE))->args)
1190 #define DEFERRED_NOEXCEPT_SPEC_P(NODE)                          \
1191   ((NODE) && (TREE_PURPOSE (NODE))                              \
1192    && (TREE_CODE (TREE_PURPOSE (NODE)) == DEFERRED_NOEXCEPT))
1193 #define UNEVALUATED_NOEXCEPT_SPEC_P(NODE)                               \
1194   (DEFERRED_NOEXCEPT_SPEC_P (NODE)                                      \
1195    && DEFERRED_NOEXCEPT_PATTERN (TREE_PURPOSE (NODE)) == NULL_TREE)
1196
1197 struct GTY (()) tree_deferred_noexcept {
1198   struct tree_base base;
1199   tree pattern;
1200   tree args;
1201 };
1202
1203
1204 /* The condition associated with the static assertion.  This must be
1205    an integral constant expression.  */
1206 #define STATIC_ASSERT_CONDITION(NODE) \
1207   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->condition)
1208
1209 /* The message associated with the static assertion.  This must be a
1210    string constant, which will be emitted as an error message when the
1211    static assert condition is false.  */
1212 #define STATIC_ASSERT_MESSAGE(NODE) \
1213   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->message)
1214
1215 /* Source location information for a static assertion.  */
1216 #define STATIC_ASSERT_SOURCE_LOCATION(NODE) \
1217   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->location)
1218
1219 struct GTY (()) tree_static_assert {
1220   struct tree_common common;
1221   tree condition;
1222   tree message;
1223   location_t location;
1224 };
1225
1226 struct GTY (()) tree_argument_pack_select {
1227   struct tree_common common;
1228   tree argument_pack;
1229   int index;
1230 };
1231
1232 /* The different kinds of traits that we encounter.  */
1233
1234 enum cp_trait_kind
1235 {
1236   CPTK_BASES,
1237   CPTK_DIRECT_BASES,
1238   CPTK_HAS_NOTHROW_ASSIGN,
1239   CPTK_HAS_NOTHROW_CONSTRUCTOR,
1240   CPTK_HAS_NOTHROW_COPY,
1241   CPTK_HAS_TRIVIAL_ASSIGN,
1242   CPTK_HAS_TRIVIAL_CONSTRUCTOR,
1243   CPTK_HAS_TRIVIAL_COPY,
1244   CPTK_HAS_TRIVIAL_DESTRUCTOR,
1245   CPTK_HAS_UNIQUE_OBJ_REPRESENTATIONS,
1246   CPTK_HAS_VIRTUAL_DESTRUCTOR,
1247   CPTK_IS_ABSTRACT,
1248   CPTK_IS_AGGREGATE,
1249   CPTK_IS_BASE_OF,
1250   CPTK_IS_CLASS,
1251   CPTK_IS_EMPTY,
1252   CPTK_IS_ENUM,
1253   CPTK_IS_FINAL,
1254   CPTK_IS_LITERAL_TYPE,
1255   CPTK_IS_POD,
1256   CPTK_IS_POLYMORPHIC,
1257   CPTK_IS_SAME_AS,
1258   CPTK_IS_STD_LAYOUT,
1259   CPTK_IS_TRIVIAL,
1260   CPTK_IS_TRIVIALLY_ASSIGNABLE,
1261   CPTK_IS_TRIVIALLY_CONSTRUCTIBLE,
1262   CPTK_IS_TRIVIALLY_COPYABLE,
1263   CPTK_IS_UNION,
1264   CPTK_UNDERLYING_TYPE,
1265   CPTK_IS_ASSIGNABLE,
1266   CPTK_IS_CONSTRUCTIBLE
1267 };
1268
1269 /* The types that we are processing.  */
1270 #define TRAIT_EXPR_TYPE1(NODE) \
1271   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->type1)
1272
1273 #define TRAIT_EXPR_TYPE2(NODE) \
1274   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->type2)
1275
1276 /* The specific trait that we are processing.  */
1277 #define TRAIT_EXPR_KIND(NODE) \
1278   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->kind)
1279
1280 struct GTY (()) tree_trait_expr {
1281   struct tree_common common;
1282   tree type1;
1283   tree type2;
1284   enum cp_trait_kind kind;
1285 };
1286
1287 /* Based off of TYPE_UNNAMED_P.  */
1288 #define LAMBDA_TYPE_P(NODE) \
1289   (CLASS_TYPE_P (NODE) && CLASSTYPE_LAMBDA_EXPR (NODE))
1290
1291 /* Test if FUNCTION_DECL is a lambda function.  */
1292 #define LAMBDA_FUNCTION_P(FNDECL)                               \
1293   (DECL_DECLARES_FUNCTION_P (FNDECL)                            \
1294    && DECL_OVERLOADED_OPERATOR_P (FNDECL)                       \
1295    && DECL_OVERLOADED_OPERATOR_IS (FNDECL, CALL_EXPR)           \
1296    && LAMBDA_TYPE_P (CP_DECL_CONTEXT (FNDECL)))
1297
1298 enum cp_lambda_default_capture_mode_type {
1299   CPLD_NONE,
1300   CPLD_COPY,
1301   CPLD_REFERENCE
1302 };
1303
1304 /* The method of default capture, if any.  */
1305 #define LAMBDA_EXPR_DEFAULT_CAPTURE_MODE(NODE) \
1306   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->default_capture_mode)
1307
1308 /* The capture-list, including `this'.  Each capture is stored as a FIELD_DECL
1309  * so that the name, type, and field are all together, whether or not it has
1310  * been added to the lambda's class type.
1311    TREE_LIST:
1312      TREE_PURPOSE: The FIELD_DECL for this capture.
1313      TREE_VALUE: The initializer. This is part of a GNU extension.  */
1314 #define LAMBDA_EXPR_CAPTURE_LIST(NODE) \
1315   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->capture_list)
1316
1317 /* During parsing of the lambda-introducer, the node in the capture-list
1318    that holds the 'this' capture.  During parsing of the body, the
1319    capture proxy for that node.  */
1320 #define LAMBDA_EXPR_THIS_CAPTURE(NODE) \
1321   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->this_capture)
1322
1323 /* Predicate tracking whether `this' is in the effective capture set.  */
1324 #define LAMBDA_EXPR_CAPTURES_THIS_P(NODE) \
1325   LAMBDA_EXPR_THIS_CAPTURE(NODE)
1326
1327 /* Predicate tracking whether the lambda was declared 'mutable'.  */
1328 #define LAMBDA_EXPR_MUTABLE_P(NODE) \
1329   TREE_LANG_FLAG_1 (LAMBDA_EXPR_CHECK (NODE))
1330
1331 /* True iff uses of a const variable capture were optimized away.  */
1332 #define LAMBDA_EXPR_CAPTURE_OPTIMIZED(NODE) \
1333   TREE_LANG_FLAG_2 (LAMBDA_EXPR_CHECK (NODE))
1334
1335 /* True if this TREE_LIST in LAMBDA_EXPR_CAPTURE_LIST is for an explicit
1336    capture.  */
1337 #define LAMBDA_CAPTURE_EXPLICIT_P(NODE) \
1338   TREE_LANG_FLAG_0 (TREE_LIST_CHECK (NODE))
1339
1340 /* The source location of the lambda.  */
1341 #define LAMBDA_EXPR_LOCATION(NODE) \
1342   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->locus)
1343
1344 /* The mangling scope for the lambda: FUNCTION_DECL, PARM_DECL, VAR_DECL,
1345    FIELD_DECL or NULL_TREE.  If this is NULL_TREE, we have no linkage.  */
1346 #define LAMBDA_EXPR_EXTRA_SCOPE(NODE) \
1347   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->extra_scope)
1348
1349 /* If EXTRA_SCOPE, this is the number of the lambda within that scope.  */
1350 #define LAMBDA_EXPR_DISCRIMINATOR(NODE) \
1351   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->discriminator)
1352
1353 /* During parsing of the lambda, a vector of capture proxies which need
1354    to be pushed once we're done processing a nested lambda.  */
1355 #define LAMBDA_EXPR_PENDING_PROXIES(NODE) \
1356   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->pending_proxies)
1357
1358 /* The closure type of the lambda, which is also the type of the
1359    LAMBDA_EXPR.  */
1360 #define LAMBDA_EXPR_CLOSURE(NODE) \
1361   (TREE_TYPE (LAMBDA_EXPR_CHECK (NODE)))
1362
1363 struct GTY (()) tree_lambda_expr
1364 {
1365   struct tree_typed typed;
1366   tree capture_list;
1367   tree this_capture;
1368   tree extra_scope;
1369   vec<tree, va_gc> *pending_proxies;
1370   location_t locus;
1371   enum cp_lambda_default_capture_mode_type default_capture_mode;
1372   int discriminator;
1373 };
1374
1375 /* A (typedef,context,usage location) triplet.
1376    It represents a typedef used through a
1377    context at a given source location.
1378    e.g.
1379    struct foo {
1380      typedef int myint;
1381    };
1382
1383    struct bar {
1384     foo::myint v; // #1<-- this location.
1385    };
1386
1387    In bar, the triplet will be (myint, foo, #1).
1388    */
1389 struct GTY(()) qualified_typedef_usage_s {
1390   tree typedef_decl;
1391   tree context;
1392   location_t locus;
1393 };
1394 typedef struct qualified_typedef_usage_s qualified_typedef_usage_t;
1395
1396 /* Non-zero if this template specialization has access violations that
1397    should be rechecked when the function is instantiated outside argument
1398    deduction.  */
1399 #define TINFO_HAS_ACCESS_ERRORS(NODE) \
1400   (TREE_LANG_FLAG_0 (TEMPLATE_INFO_CHECK (NODE)))
1401 #define FNDECL_HAS_ACCESS_ERRORS(NODE) \
1402   (TINFO_HAS_ACCESS_ERRORS (DECL_TEMPLATE_INFO (NODE)))
1403
1404 /* Non-zero if this variable template specialization was specified using a
1405    template-id, so it's a partial or full specialization and not a definition
1406    of the member template of a particular class specialization.  */
1407 #define TINFO_USED_TEMPLATE_ID(NODE) \
1408   (TREE_LANG_FLAG_1 (TEMPLATE_INFO_CHECK (NODE)))
1409
1410 struct GTY(()) tree_template_info {
1411   struct tree_common common;
1412   vec<qualified_typedef_usage_t, va_gc> *typedefs_needing_access_checking;
1413 };
1414
1415 // Constraint information for a C++ declaration. Constraint information is
1416 // comprised of:
1417 //
1418 // - a constraint expression introduced by the template header
1419 // - a constraint expression introduced by a function declarator
1420 // - the associated constraints, which are the conjunction of those,
1421 //   and used for declaration matching
1422 //
1423 // The template and declarator requirements are kept to support pretty
1424 // printing constrained declarations.
1425 struct GTY(()) tree_constraint_info {
1426   struct tree_base base;
1427   tree template_reqs;
1428   tree declarator_reqs;
1429   tree associated_constr;
1430 };
1431
1432 // Require that pointer P is non-null before returning.
1433 template<typename T>
1434 inline T*
1435 check_nonnull (T* p)
1436 {
1437   gcc_assert (p);
1438   return p;
1439 }
1440
1441 // Returns true iff T is non-null and represents constraint info.
1442 inline tree_constraint_info *
1443 check_constraint_info (tree t)
1444 {
1445   if (t && TREE_CODE (t) == CONSTRAINT_INFO)
1446     return (tree_constraint_info *)t;
1447   return NULL;
1448 }
1449
1450 // Access the expression describing the template constraints. This may be
1451 // null if no constraints were introduced in the template parameter list,
1452 // a requirements clause after the template parameter list, or constraints
1453 // through a constrained-type-specifier.
1454 #define CI_TEMPLATE_REQS(NODE) \
1455   check_constraint_info (check_nonnull(NODE))->template_reqs
1456
1457 // Access the expression describing the trailing constraints. This is non-null
1458 // for any implicit instantiation of a constrained declaration. For a
1459 // templated declaration it is non-null only when a trailing requires-clause
1460 // was specified.
1461 #define CI_DECLARATOR_REQS(NODE) \
1462   check_constraint_info (check_nonnull(NODE))->declarator_reqs
1463
1464 // The computed associated constraint expression for a declaration.
1465 #define CI_ASSOCIATED_CONSTRAINTS(NODE) \
1466   check_constraint_info (check_nonnull(NODE))->associated_constr
1467
1468 // Access the logical constraints on the template parameters introduced
1469 // at a given template parameter list level indicated by NODE.
1470 #define TEMPLATE_PARMS_CONSTRAINTS(NODE) \
1471   TREE_TYPE (TREE_LIST_CHECK (NODE))
1472
1473 // Access the logical constraints on the template parameter declaration
1474 // indicated by NODE.
1475 #define TEMPLATE_PARM_CONSTRAINTS(NODE) \
1476   TREE_TYPE (TREE_LIST_CHECK (NODE))
1477
1478 /* Non-zero if the noexcept is present in a compound requirement. */
1479 #define COMPOUND_REQ_NOEXCEPT_P(NODE) \
1480   TREE_LANG_FLAG_0 (TREE_CHECK (NODE, COMPOUND_REQ))
1481
1482 /* The constraints on an 'auto' placeholder type, used in an argument deduction
1483    constraint.  */
1484 #define PLACEHOLDER_TYPE_CONSTRAINTS(NODE) \
1485   DECL_SIZE_UNIT (TYPE_NAME (NODE))
1486
1487 /* The expression evaluated by the predicate constraint. */
1488 #define PRED_CONSTR_EXPR(NODE) \
1489   TREE_OPERAND (TREE_CHECK (NODE, PRED_CONSTR), 0)
1490
1491 /* The concept of a concept check. */
1492 #define CHECK_CONSTR_CONCEPT(NODE) \
1493   TREE_OPERAND (TREE_CHECK (NODE, CHECK_CONSTR), 0)
1494
1495 /* The template arguments of a concept check. */
1496 #define CHECK_CONSTR_ARGS(NODE) \
1497   TREE_OPERAND (TREE_CHECK (NODE, CHECK_CONSTR), 1)
1498
1499 /* The expression validated by the predicate constraint. */
1500 #define EXPR_CONSTR_EXPR(NODE) \
1501   TREE_OPERAND (TREE_CHECK (NODE, EXPR_CONSTR), 0)
1502
1503 /* The type validated by the predicate constraint. */
1504 #define TYPE_CONSTR_TYPE(NODE) \
1505   TREE_OPERAND (TREE_CHECK (NODE, TYPE_CONSTR), 0)
1506
1507 /* In an implicit conversion constraint, the source expression. */
1508 #define ICONV_CONSTR_EXPR(NODE) \
1509   TREE_OPERAND (TREE_CHECK (NODE, ICONV_CONSTR), 0)
1510
1511 /* In an implicit conversion constraint, the target type. */
1512 #define ICONV_CONSTR_TYPE(NODE) \
1513   TREE_OPERAND (TREE_CHECK (NODE, ICONV_CONSTR), 1)
1514
1515 /* In an argument deduction constraint, the source expression. */
1516 #define DEDUCT_CONSTR_EXPR(NODE) \
1517   TREE_OPERAND (TREE_CHECK (NODE, DEDUCT_CONSTR), 0)
1518
1519 /* In an argument deduction constraint, the target type pattern. */
1520 #define DEDUCT_CONSTR_PATTERN(NODE) \
1521   TREE_OPERAND (TREE_CHECK (NODE, DEDUCT_CONSTR), 1)
1522
1523 /* In an argument deduction constraint, the list of placeholder nodes. */
1524 #define DEDUCT_CONSTR_PLACEHOLDER(NODE) \
1525   TREE_OPERAND (TREE_CHECK (NODE, DEDUCT_CONSTR), 2)
1526
1527 /* The expression of an exception constraint. */
1528 #define EXCEPT_CONSTR_EXPR(NODE) \
1529   TREE_OPERAND (TREE_CHECK (NODE, EXCEPT_CONSTR), 0)
1530
1531 /* In a parameterized constraint, the local parameters. */
1532 #define PARM_CONSTR_PARMS(NODE) \
1533   TREE_OPERAND (TREE_CHECK (NODE, PARM_CONSTR), 0)
1534
1535 /* In a parameterized constraint, the operand. */
1536 #define PARM_CONSTR_OPERAND(NODE) \
1537   TREE_OPERAND (TREE_CHECK (NODE, PARM_CONSTR), 1)
1538
1539 /* Whether a PARM_DECL represents a local parameter in a
1540    requires-expression.  */
1541 #define CONSTRAINT_VAR_P(NODE) \
1542   DECL_LANG_FLAG_2 (TREE_CHECK (NODE, PARM_DECL))
1543
1544 /* The concept constraining this constrained template-parameter.  */
1545 #define CONSTRAINED_PARM_CONCEPT(NODE) \
1546   DECL_SIZE_UNIT (TYPE_DECL_CHECK (NODE))
1547 /* Any extra template arguments specified for a constrained
1548    template-parameter.  */
1549 #define CONSTRAINED_PARM_EXTRA_ARGS(NODE) \
1550   DECL_SIZE (TYPE_DECL_CHECK (NODE))
1551 /* The first template parameter of CONSTRAINED_PARM_CONCEPT to be used as a
1552    prototype for the constrained parameter in finish_shorthand_constraint,
1553    attached for convenience.  */
1554 #define CONSTRAINED_PARM_PROTOTYPE(NODE) \
1555   DECL_INITIAL (TYPE_DECL_CHECK (NODE))
1556
1557 enum cp_tree_node_structure_enum {
1558   TS_CP_GENERIC,
1559   TS_CP_IDENTIFIER,
1560   TS_CP_TPI,
1561   TS_CP_PTRMEM,
1562   TS_CP_OVERLOAD,
1563   TS_CP_BASELINK,
1564   TS_CP_TEMPLATE_DECL,
1565   TS_CP_DEFAULT_ARG,
1566   TS_CP_DEFERRED_NOEXCEPT,
1567   TS_CP_STATIC_ASSERT,
1568   TS_CP_ARGUMENT_PACK_SELECT,
1569   TS_CP_TRAIT_EXPR,
1570   TS_CP_LAMBDA_EXPR,
1571   TS_CP_TEMPLATE_INFO,
1572   TS_CP_CONSTRAINT_INFO,
1573   TS_CP_USERDEF_LITERAL
1574 };
1575
1576 /* The resulting tree type.  */
1577 union GTY((desc ("cp_tree_node_structure (&%h)"),
1578        chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node {
1579   union tree_node GTY ((tag ("TS_CP_GENERIC"),
1580                         desc ("tree_node_structure (&%h)"))) generic;
1581   struct template_parm_index GTY ((tag ("TS_CP_TPI"))) tpi;
1582   struct ptrmem_cst GTY ((tag ("TS_CP_PTRMEM"))) ptrmem;
1583   struct tree_overload GTY ((tag ("TS_CP_OVERLOAD"))) overload;
1584   struct tree_baselink GTY ((tag ("TS_CP_BASELINK"))) baselink;
1585   struct tree_template_decl GTY ((tag ("TS_CP_TEMPLATE_DECL"))) template_decl;
1586   struct tree_default_arg GTY ((tag ("TS_CP_DEFAULT_ARG"))) default_arg;
1587   struct tree_deferred_noexcept GTY ((tag ("TS_CP_DEFERRED_NOEXCEPT"))) deferred_noexcept;
1588   struct lang_identifier GTY ((tag ("TS_CP_IDENTIFIER"))) identifier;
1589   struct tree_static_assert GTY ((tag ("TS_CP_STATIC_ASSERT")))
1590     static_assertion;
1591   struct tree_argument_pack_select GTY ((tag ("TS_CP_ARGUMENT_PACK_SELECT")))
1592     argument_pack_select;
1593   struct tree_trait_expr GTY ((tag ("TS_CP_TRAIT_EXPR")))
1594     trait_expression;
1595   struct tree_lambda_expr GTY ((tag ("TS_CP_LAMBDA_EXPR")))
1596     lambda_expression;
1597   struct tree_template_info GTY ((tag ("TS_CP_TEMPLATE_INFO")))
1598     template_info;
1599   struct tree_constraint_info GTY ((tag ("TS_CP_CONSTRAINT_INFO")))
1600     constraint_info;
1601   struct tree_userdef_literal GTY ((tag ("TS_CP_USERDEF_LITERAL")))
1602     userdef_literal;
1603 };
1604
1605 \f
1606 /* Global state.  */
1607
1608 struct GTY(()) saved_scope {
1609   vec<cxx_saved_binding, va_gc> *old_bindings;
1610   tree old_namespace;
1611   vec<tree, va_gc> *decl_ns_list;
1612   tree class_name;
1613   tree class_type;
1614   tree access_specifier;
1615   tree function_decl;
1616   vec<tree, va_gc> *lang_base;
1617   tree lang_name;
1618   tree template_parms;
1619   cp_binding_level *x_previous_class_level;
1620   tree x_saved_tree;
1621
1622   /* Only used for uses of this in trailing return type.  */
1623   tree x_current_class_ptr;
1624   tree x_current_class_ref;
1625
1626   int x_processing_template_decl;
1627   int x_processing_specialization;
1628   BOOL_BITFIELD x_processing_explicit_instantiation : 1;
1629   BOOL_BITFIELD need_pop_function_context : 1;
1630
1631 /* Nonzero if we are parsing the discarded statement of a constexpr
1632    if-statement.  */
1633   BOOL_BITFIELD discarded_stmt : 1;
1634
1635   int unevaluated_operand;
1636   int inhibit_evaluation_warnings;
1637   int noexcept_operand;
1638   /* If non-zero, implicit "omp declare target" attribute is added into the
1639      attribute lists.  */
1640   int omp_declare_target_attribute;
1641
1642   struct stmt_tree_s x_stmt_tree;
1643
1644   cp_binding_level *class_bindings;
1645   cp_binding_level *bindings;
1646
1647   hash_map<tree, tree> *GTY((skip)) x_local_specializations;
1648
1649   struct saved_scope *prev;
1650 };
1651
1652 extern GTY(()) struct saved_scope *scope_chain;
1653
1654 /* The current open namespace.  */
1655
1656 #define current_namespace scope_chain->old_namespace
1657
1658 /* The stack for namespaces of current declarations.  */
1659
1660 #define decl_namespace_list scope_chain->decl_ns_list
1661
1662 /* IDENTIFIER_NODE: name of current class */
1663
1664 #define current_class_name scope_chain->class_name
1665
1666 /* _TYPE: the type of the current class */
1667
1668 #define current_class_type scope_chain->class_type
1669
1670 /* When parsing a class definition, the access specifier most recently
1671    given by the user, or, if no access specifier was given, the
1672    default value appropriate for the kind of class (i.e., struct,
1673    class, or union).  */
1674
1675 #define current_access_specifier scope_chain->access_specifier
1676
1677 /* Pointer to the top of the language name stack.  */
1678
1679 #define current_lang_base scope_chain->lang_base
1680 #define current_lang_name scope_chain->lang_name
1681
1682 /* When parsing a template declaration, a TREE_LIST represents the
1683    active template parameters.  Each node in the list represents one
1684    level of template parameters.  The innermost level is first in the
1685    list.  The depth of each level is stored as an INTEGER_CST in the
1686    TREE_PURPOSE of each node.  The parameters for that level are
1687    stored in the TREE_VALUE.  */
1688
1689 #define current_template_parms scope_chain->template_parms
1690
1691 #define processing_template_decl scope_chain->x_processing_template_decl
1692 #define processing_specialization scope_chain->x_processing_specialization
1693 #define processing_explicit_instantiation scope_chain->x_processing_explicit_instantiation
1694
1695 #define in_discarded_stmt scope_chain->discarded_stmt
1696
1697 /* RAII sentinel to handle clearing processing_template_decl and restoring
1698    it when done.  */
1699
1700 struct processing_template_decl_sentinel
1701 {
1702   int saved;
1703   processing_template_decl_sentinel (bool reset = true)
1704     : saved (processing_template_decl)
1705   {
1706     if (reset)
1707       processing_template_decl = 0;
1708   }
1709   ~processing_template_decl_sentinel()
1710   {
1711     processing_template_decl = saved;
1712   }
1713 };
1714
1715 /* RAII sentinel to disable certain warnings during template substitution
1716    and elsewhere.  */
1717
1718 struct warning_sentinel
1719 {
1720   int &flag;
1721   int val;
1722   warning_sentinel(int& flag, bool suppress=true)
1723     : flag(flag), val(flag) { if (suppress) flag = 0; }
1724   ~warning_sentinel() { flag = val; }
1725 };
1726
1727 /* RAII sentinel that saves the value of a variable, optionally
1728    overrides it right away, and restores its value when the sentinel
1729    id destructed.  */
1730
1731 template <typename T>
1732 class temp_override
1733 {
1734   T& overridden_variable;
1735   T saved_value;
1736 public:
1737   temp_override(T& var) : overridden_variable (var), saved_value (var) {}
1738   temp_override(T& var, T overrider)
1739     : overridden_variable (var), saved_value (var)
1740   {
1741     overridden_variable = overrider;
1742   }
1743   ~temp_override() { overridden_variable = saved_value; }
1744 };
1745
1746 /* The cached class binding level, from the most recently exited
1747    class, or NULL if none.  */
1748
1749 #define previous_class_level scope_chain->x_previous_class_level
1750
1751 /* A map from local variable declarations in the body of the template
1752    presently being instantiated to the corresponding instantiated
1753    local variables.  */
1754
1755 #define local_specializations scope_chain->x_local_specializations
1756
1757 /* Nonzero if we are parsing the operand of a noexcept operator.  */
1758
1759 #define cp_noexcept_operand scope_chain->noexcept_operand
1760
1761 /* A list of private types mentioned, for deferred access checking.  */
1762
1763 struct GTY((for_user)) cxx_int_tree_map {
1764   unsigned int uid;
1765   tree to;
1766 };
1767
1768 struct cxx_int_tree_map_hasher : ggc_ptr_hash<cxx_int_tree_map>
1769 {
1770   static hashval_t hash (cxx_int_tree_map *);
1771   static bool equal (cxx_int_tree_map *, cxx_int_tree_map *);
1772 };
1773
1774 struct named_label_entry; /* Defined in decl.c.  */
1775
1776 struct named_label_hash : ggc_remove <named_label_entry *>
1777 {
1778   typedef named_label_entry *value_type;
1779   typedef tree compare_type; /* An identifier.  */
1780
1781   inline static hashval_t hash (value_type);
1782   inline static bool equal (const value_type, compare_type);
1783
1784   inline static void mark_empty (value_type &p) {p = NULL;}
1785   inline static bool is_empty (value_type p) {return !p;}
1786
1787   /* Nothing is deletable.  Everything is insertable.  */
1788   inline static bool is_deleted (value_type) { return false; }
1789   inline static void mark_deleted (value_type) { gcc_unreachable (); }
1790 };
1791
1792 /* Global state pertinent to the current function.  */
1793
1794 struct GTY(()) language_function {
1795   struct c_language_function base;
1796
1797   tree x_cdtor_label;
1798   tree x_current_class_ptr;
1799   tree x_current_class_ref;
1800   tree x_eh_spec_block;
1801   tree x_in_charge_parm;
1802   tree x_vtt_parm;
1803   tree x_return_value;
1804   tree x_auto_return_pattern;
1805
1806   BOOL_BITFIELD returns_value : 1;
1807   BOOL_BITFIELD returns_null : 1;
1808   BOOL_BITFIELD returns_abnormally : 1;
1809   BOOL_BITFIELD infinite_loop: 1;
1810   BOOL_BITFIELD x_in_function_try_handler : 1;
1811   BOOL_BITFIELD x_in_base_initializer : 1;
1812
1813   /* True if this function can throw an exception.  */
1814   BOOL_BITFIELD can_throw : 1;
1815
1816   BOOL_BITFIELD invalid_constexpr : 1;
1817
1818   hash_table<named_label_hash> *x_named_labels;
1819
1820   cp_binding_level *bindings;
1821
1822   /* Tracking possibly infinite loops.  This is a vec<tree> only because
1823      vec<bool> doesn't work with gtype.  */
1824   vec<tree, va_gc> *infinite_loops;
1825   hash_table<cxx_int_tree_map_hasher> *extern_decl_map;
1826 };
1827
1828 /* The current C++-specific per-function global variables.  */
1829
1830 #define cp_function_chain (cfun->language)
1831
1832 /* In a constructor destructor, the point at which all derived class
1833    destroying/construction has been done.  I.e., just before a
1834    constructor returns, or before any base class destroying will be done
1835    in a destructor.  */
1836
1837 #define cdtor_label cp_function_chain->x_cdtor_label
1838
1839 /* When we're processing a member function, current_class_ptr is the
1840    PARM_DECL for the `this' pointer.  The current_class_ref is an
1841    expression for `*this'.  */
1842
1843 #define current_class_ptr                       \
1844   (*(cfun && cp_function_chain                  \
1845      ? &cp_function_chain->x_current_class_ptr  \
1846      : &scope_chain->x_current_class_ptr))
1847 #define current_class_ref                       \
1848   (*(cfun && cp_function_chain                  \
1849      ? &cp_function_chain->x_current_class_ref  \
1850      : &scope_chain->x_current_class_ref))
1851
1852 /* The EH_SPEC_BLOCK for the exception-specifiers for the current
1853    function, if any.  */
1854
1855 #define current_eh_spec_block cp_function_chain->x_eh_spec_block
1856
1857 /* The `__in_chrg' parameter for the current function.  Only used for
1858    constructors and destructors.  */
1859
1860 #define current_in_charge_parm cp_function_chain->x_in_charge_parm
1861
1862 /* The `__vtt_parm' parameter for the current function.  Only used for
1863    constructors and destructors.  */
1864
1865 #define current_vtt_parm cp_function_chain->x_vtt_parm
1866
1867 /* Set to 0 at beginning of a function definition, set to 1 if
1868    a return statement that specifies a return value is seen.  */
1869
1870 #define current_function_returns_value cp_function_chain->returns_value
1871
1872 /* Set to 0 at beginning of a function definition, set to 1 if
1873    a return statement with no argument is seen.  */
1874
1875 #define current_function_returns_null cp_function_chain->returns_null
1876
1877 /* Set to 0 at beginning of a function definition, set to 1 if
1878    a call to a noreturn function is seen.  */
1879
1880 #define current_function_returns_abnormally \
1881   cp_function_chain->returns_abnormally
1882
1883 /* Set to 0 at beginning of a function definition, set to 1 if we see an
1884    obvious infinite loop.  This can have false positives and false
1885    negatives, so it should only be used as a heuristic.  */
1886
1887 #define current_function_infinite_loop cp_function_chain->infinite_loop
1888
1889 /* Nonzero if we are processing a base initializer.  Zero elsewhere.  */
1890 #define in_base_initializer cp_function_chain->x_in_base_initializer
1891
1892 #define in_function_try_handler cp_function_chain->x_in_function_try_handler
1893
1894 /* Expression always returned from function, or error_mark_node
1895    otherwise, for use by the automatic named return value optimization.  */
1896
1897 #define current_function_return_value \
1898   (cp_function_chain->x_return_value)
1899
1900 /* A type involving 'auto' to be used for return type deduction.  */
1901
1902 #define current_function_auto_return_pattern \
1903   (cp_function_chain->x_auto_return_pattern)
1904
1905 /* In parser.c.  */
1906 extern tree cp_literal_operator_id (const char *);
1907
1908 #define NON_ERROR(NODE) ((NODE) == error_mark_node ? NULL_TREE : (NODE))
1909
1910 /* TRUE if a tree code represents a statement.  */
1911 extern bool statement_code_p[MAX_TREE_CODES];
1912
1913 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
1914
1915 enum languages { lang_c, lang_cplusplus };
1916
1917 /* Macros to make error reporting functions' lives easier.  */
1918 #define TYPE_LINKAGE_IDENTIFIER(NODE) \
1919   (TYPE_IDENTIFIER (TYPE_MAIN_VARIANT (NODE)))
1920 #define TYPE_NAME_STRING(NODE) (IDENTIFIER_POINTER (TYPE_IDENTIFIER (NODE)))
1921 #define TYPE_NAME_LENGTH(NODE) (IDENTIFIER_LENGTH (TYPE_IDENTIFIER (NODE)))
1922
1923 /* Nonzero if NODE has no name for linkage purposes.  */
1924 #define TYPE_UNNAMED_P(NODE) \
1925   (OVERLOAD_TYPE_P (NODE) && anon_aggrname_p (TYPE_LINKAGE_IDENTIFIER (NODE)))
1926
1927 /* The _DECL for this _TYPE.  */
1928 #define TYPE_MAIN_DECL(NODE) (TYPE_STUB_DECL (TYPE_MAIN_VARIANT (NODE)))
1929
1930 /* Nonzero if T is a type that could resolve to any kind of concrete type
1931    at instantiation time.  */
1932 #define WILDCARD_TYPE_P(T)                              \
1933   (TREE_CODE (T) == TEMPLATE_TYPE_PARM                  \
1934    || TREE_CODE (T) == TYPENAME_TYPE                    \
1935    || TREE_CODE (T) == TYPEOF_TYPE                      \
1936    || TREE_CODE (T) == BOUND_TEMPLATE_TEMPLATE_PARM     \
1937    || TREE_CODE (T) == DECLTYPE_TYPE)
1938
1939 /* Nonzero if T is a class (or struct or union) type.  Also nonzero
1940    for template type parameters, typename types, and instantiated
1941    template template parameters.  Keep these checks in ascending code
1942    order.  */
1943 #define MAYBE_CLASS_TYPE_P(T) (WILDCARD_TYPE_P (T) || CLASS_TYPE_P (T))
1944
1945 /* Set CLASS_TYPE_P for T to VAL.  T must be a class, struct, or
1946    union type.  */
1947 #define SET_CLASS_TYPE_P(T, VAL) \
1948   (TYPE_LANG_FLAG_5 (RECORD_OR_UNION_CHECK (T)) = (VAL))
1949
1950 /* Nonzero if T is a class type.  Zero for template type parameters,
1951    typename types, and so forth.  */
1952 #define CLASS_TYPE_P(T) \
1953   (RECORD_OR_UNION_CODE_P (TREE_CODE (T)) && TYPE_LANG_FLAG_5 (T))
1954
1955 /* Nonzero if T is a class type but not an union.  */
1956 #define NON_UNION_CLASS_TYPE_P(T) \
1957   (TREE_CODE (T) == RECORD_TYPE && TYPE_LANG_FLAG_5 (T))
1958
1959 /* Keep these checks in ascending code order.  */
1960 #define RECORD_OR_UNION_CODE_P(T)       \
1961   ((T) == RECORD_TYPE || (T) == UNION_TYPE)
1962 #define OVERLOAD_TYPE_P(T) \
1963   (CLASS_TYPE_P (T) || TREE_CODE (T) == ENUMERAL_TYPE)
1964
1965 /* True if this type is dependent.  This predicate is only valid if
1966    TYPE_DEPENDENT_P_VALID is true.  */
1967 #define TYPE_DEPENDENT_P(NODE) TYPE_LANG_FLAG_0 (NODE)
1968
1969 /* True if dependent_type_p has been called for this type, with the
1970    result that TYPE_DEPENDENT_P is valid.  */
1971 #define TYPE_DEPENDENT_P_VALID(NODE) TYPE_LANG_FLAG_6(NODE)
1972
1973 /* Nonzero if this type is const-qualified.  */
1974 #define CP_TYPE_CONST_P(NODE)                           \
1975   ((cp_type_quals (NODE) & TYPE_QUAL_CONST) != 0)
1976
1977 /* Nonzero if this type is volatile-qualified.  */
1978 #define CP_TYPE_VOLATILE_P(NODE)                        \
1979   ((cp_type_quals (NODE) & TYPE_QUAL_VOLATILE) != 0)
1980
1981 /* Nonzero if this type is restrict-qualified.  */
1982 #define CP_TYPE_RESTRICT_P(NODE)                        \
1983   ((cp_type_quals (NODE) & TYPE_QUAL_RESTRICT) != 0)
1984
1985 /* Nonzero if this type is const-qualified, but not
1986    volatile-qualified.  Other qualifiers are ignored.  This macro is
1987    used to test whether or not it is OK to bind an rvalue to a
1988    reference.  */
1989 #define CP_TYPE_CONST_NON_VOLATILE_P(NODE)                              \
1990   ((cp_type_quals (NODE) & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE))      \
1991    == TYPE_QUAL_CONST)
1992
1993 #define FUNCTION_ARG_CHAIN(NODE) \
1994   TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (NODE)))
1995
1996 /* Given a FUNCTION_DECL, returns the first TREE_LIST out of TYPE_ARG_TYPES
1997    which refers to a user-written parameter.  */
1998 #define FUNCTION_FIRST_USER_PARMTYPE(NODE) \
1999   skip_artificial_parms_for ((NODE), TYPE_ARG_TYPES (TREE_TYPE (NODE)))
2000
2001 /* Similarly, but for DECL_ARGUMENTS.  */
2002 #define FUNCTION_FIRST_USER_PARM(NODE) \
2003   skip_artificial_parms_for ((NODE), DECL_ARGUMENTS (NODE))
2004
2005 /* Nonzero iff TYPE is derived from PARENT. Ignores accessibility and
2006    ambiguity issues.  */
2007 #define DERIVED_FROM_P(PARENT, TYPE) \
2008   (lookup_base ((TYPE), (PARENT), ba_any, NULL, tf_none) != NULL_TREE)
2009
2010 /* Gives the visibility specification for a class type.  */
2011 #define CLASSTYPE_VISIBILITY(TYPE)              \
2012         DECL_VISIBILITY (TYPE_MAIN_DECL (TYPE))
2013 #define CLASSTYPE_VISIBILITY_SPECIFIED(TYPE)    \
2014         DECL_VISIBILITY_SPECIFIED (TYPE_MAIN_DECL (TYPE))
2015
2016 struct GTY (()) tree_pair_s {
2017   tree purpose;
2018   tree value;
2019 };
2020 typedef tree_pair_s *tree_pair_p;
2021
2022 /* This structure provides additional information above and beyond
2023    what is provide in the ordinary tree_type.  In the past, we used it
2024    for the types of class types, template parameters types, typename
2025    types, and so forth.  However, there can be many (tens to hundreds
2026    of thousands) of template parameter types in a compilation, and
2027    there's no need for this additional information in that case.
2028    Therefore, we now use this data structure only for class types.
2029
2030    In the past, it was thought that there would be relatively few
2031    class types.  However, in the presence of heavy use of templates,
2032    many (i.e., thousands) of classes can easily be generated.
2033    Therefore, we should endeavor to keep the size of this structure to
2034    a minimum.  */
2035 struct GTY(()) lang_type {
2036   unsigned char align;
2037
2038   unsigned has_type_conversion : 1;
2039   unsigned has_copy_ctor : 1;
2040   unsigned has_default_ctor : 1;
2041   unsigned const_needs_init : 1;
2042   unsigned ref_needs_init : 1;
2043   unsigned has_const_copy_assign : 1;
2044   unsigned use_template : 2;
2045
2046   unsigned has_mutable : 1;
2047   unsigned com_interface : 1;
2048   unsigned non_pod_class : 1;
2049   unsigned nearly_empty_p : 1;
2050   unsigned user_align : 1;
2051   unsigned has_copy_assign : 1;
2052   unsigned has_new : 1;
2053   unsigned has_array_new : 1;
2054
2055   unsigned gets_delete : 2;
2056   unsigned interface_only : 1;
2057   unsigned interface_unknown : 1;
2058   unsigned contains_empty_class_p : 1;
2059   unsigned anon_aggr : 1;
2060   unsigned non_zero_init : 1;
2061   unsigned empty_p : 1;
2062   /* 32 bits allocated.  */
2063
2064   unsigned vec_new_uses_cookie : 1;
2065   unsigned declared_class : 1;
2066   unsigned diamond_shaped : 1;
2067   unsigned repeated_base : 1;
2068   unsigned being_defined : 1;
2069   unsigned debug_requested : 1;
2070   unsigned fields_readonly : 1;
2071   unsigned ptrmemfunc_flag : 1;
2072
2073   unsigned was_anonymous : 1;
2074   unsigned lazy_default_ctor : 1;
2075   unsigned lazy_copy_ctor : 1;
2076   unsigned lazy_copy_assign : 1;
2077   unsigned lazy_destructor : 1;
2078   unsigned has_const_copy_ctor : 1;
2079   unsigned has_complex_copy_ctor : 1;
2080   unsigned has_complex_copy_assign : 1;
2081
2082   unsigned non_aggregate : 1;
2083   unsigned has_complex_dflt : 1;
2084   unsigned has_list_ctor : 1;
2085   unsigned non_std_layout : 1;
2086   unsigned is_literal : 1;
2087   unsigned lazy_move_ctor : 1;
2088   unsigned lazy_move_assign : 1;
2089   unsigned has_complex_move_ctor : 1;
2090
2091   unsigned has_complex_move_assign : 1;
2092   unsigned has_constexpr_ctor : 1;
2093   unsigned unique_obj_representations : 1;
2094   unsigned unique_obj_representations_set : 1;
2095
2096   /* When adding a flag here, consider whether or not it ought to
2097      apply to a template instance if it applies to the template.  If
2098      so, make sure to copy it in instantiate_class_template!  */
2099
2100   /* There are some bits left to fill out a 32-bit word.  Keep track
2101      of this by updating the size of this bitfield whenever you add or
2102      remove a flag.  */
2103   unsigned dummy : 4;
2104
2105   tree primary_base;
2106   vec<tree_pair_s, va_gc> *vcall_indices;
2107   tree vtables;
2108   tree typeinfo_var;
2109   vec<tree, va_gc> *vbases;
2110   binding_table nested_udts;
2111   tree as_base;
2112   vec<tree, va_gc> *pure_virtuals;
2113   tree friend_classes;
2114   vec<tree, va_gc> * GTY((reorder ("resort_type_member_vec"))) members;
2115   tree key_method;
2116   tree decl_list;
2117   tree befriending_classes;
2118   /* In a RECORD_TYPE, information specific to Objective-C++, such
2119      as a list of adopted protocols or a pointer to a corresponding
2120      @interface.  See objc/objc-act.h for details.  */
2121   tree objc_info;
2122   /* FIXME reuse another field?  */
2123   tree lambda_expr;
2124 };
2125
2126 /* We used to have a variant type for lang_type.  Keep the name of the
2127    checking accessor for the sole survivor.  */
2128 #define LANG_TYPE_CLASS_CHECK(NODE) (TYPE_LANG_SPECIFIC (NODE))
2129
2130 /* Nonzero for _CLASSTYPE means that operator delete is defined.  */
2131 #define TYPE_GETS_DELETE(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->gets_delete)
2132 #define TYPE_GETS_REG_DELETE(NODE) (TYPE_GETS_DELETE (NODE) & 1)
2133
2134 /* Nonzero if `new NODE[x]' should cause the allocation of extra
2135    storage to indicate how many array elements are in use.  */
2136 #define TYPE_VEC_NEW_USES_COOKIE(NODE)                  \
2137   (CLASS_TYPE_P (NODE)                                  \
2138    && LANG_TYPE_CLASS_CHECK (NODE)->vec_new_uses_cookie)
2139
2140 /* Nonzero means that this _CLASSTYPE node defines ways of converting
2141    itself to other types.  */
2142 #define TYPE_HAS_CONVERSION(NODE) \
2143   (LANG_TYPE_CLASS_CHECK (NODE)->has_type_conversion)
2144
2145 /* Nonzero means that NODE (a class type) has a default constructor --
2146    but that it has not yet been declared.  */
2147 #define CLASSTYPE_LAZY_DEFAULT_CTOR(NODE) \
2148   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_default_ctor)
2149
2150 /* Nonzero means that NODE (a class type) has a copy constructor --
2151    but that it has not yet been declared.  */
2152 #define CLASSTYPE_LAZY_COPY_CTOR(NODE) \
2153   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_copy_ctor)
2154
2155 /* Nonzero means that NODE (a class type) has a move constructor --
2156    but that it has not yet been declared.  */
2157 #define CLASSTYPE_LAZY_MOVE_CTOR(NODE) \
2158   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_move_ctor)
2159
2160 /* Nonzero means that NODE (a class type) has an assignment operator
2161    -- but that it has not yet been declared.  */
2162 #define CLASSTYPE_LAZY_COPY_ASSIGN(NODE) \
2163   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_copy_assign)
2164
2165 /* Nonzero means that NODE (a class type) has an assignment operator
2166    -- but that it has not yet been declared.  */
2167 #define CLASSTYPE_LAZY_MOVE_ASSIGN(NODE) \
2168   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_move_assign)
2169
2170 /* Nonzero means that NODE (a class type) has a destructor -- but that
2171    it has not yet been declared.  */
2172 #define CLASSTYPE_LAZY_DESTRUCTOR(NODE) \
2173   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_destructor)
2174
2175 /* Nonzero means that NODE (a class type) is final */
2176 #define CLASSTYPE_FINAL(NODE) \
2177   TYPE_FINAL_P (NODE)
2178
2179
2180 /* Nonzero means that this _CLASSTYPE node overloads operator=(X&).  */
2181 #define TYPE_HAS_COPY_ASSIGN(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_copy_assign)
2182
2183 /* True iff the class type NODE has an "operator =" whose parameter
2184    has a parameter of type "const X&".  */
2185 #define TYPE_HAS_CONST_COPY_ASSIGN(NODE) \
2186   (LANG_TYPE_CLASS_CHECK (NODE)->has_const_copy_assign)
2187
2188 /* Nonzero means that this _CLASSTYPE node has an X(X&) constructor.  */
2189 #define TYPE_HAS_COPY_CTOR(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_copy_ctor)
2190 #define TYPE_HAS_CONST_COPY_CTOR(NODE) \
2191   (LANG_TYPE_CLASS_CHECK (NODE)->has_const_copy_ctor)
2192
2193 /* Nonzero if this class has an X(initializer_list<T>) constructor.  */
2194 #define TYPE_HAS_LIST_CTOR(NODE) \
2195   (LANG_TYPE_CLASS_CHECK (NODE)->has_list_ctor)
2196
2197 /* Nonzero if this class has a constexpr constructor other than a copy/move
2198    constructor.  Note that a class can have constexpr constructors for
2199    static initialization even if it isn't a literal class.  */
2200 #define TYPE_HAS_CONSTEXPR_CTOR(NODE) \
2201   (LANG_TYPE_CLASS_CHECK (NODE)->has_constexpr_ctor)
2202
2203 /* Nonzero if this class defines an overloaded operator new.  (An
2204    operator new [] doesn't count.)  */
2205 #define TYPE_HAS_NEW_OPERATOR(NODE) \
2206   (LANG_TYPE_CLASS_CHECK (NODE)->has_new)
2207
2208 /* Nonzero if this class defines an overloaded operator new[].  */
2209 #define TYPE_HAS_ARRAY_NEW_OPERATOR(NODE) \
2210   (LANG_TYPE_CLASS_CHECK (NODE)->has_array_new)
2211
2212 /* Nonzero means that this type is being defined.  I.e., the left brace
2213    starting the definition of this type has been seen.  */
2214 #define TYPE_BEING_DEFINED(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->being_defined)
2215
2216 /* Nonzero means that this type is either complete or being defined, so we
2217    can do lookup in it.  */
2218 #define COMPLETE_OR_OPEN_TYPE_P(NODE) \
2219   (COMPLETE_TYPE_P (NODE) || (CLASS_TYPE_P (NODE) && TYPE_BEING_DEFINED (NODE)))
2220
2221 /* Mark bits for repeated base checks.  */
2222 #define TYPE_MARKED_P(NODE) TREE_LANG_FLAG_6 (TYPE_CHECK (NODE))
2223
2224 /* Nonzero if the class NODE has multiple paths to the same (virtual)
2225    base object.  */
2226 #define CLASSTYPE_DIAMOND_SHAPED_P(NODE) \
2227   (LANG_TYPE_CLASS_CHECK(NODE)->diamond_shaped)
2228
2229 /* Nonzero if the class NODE has multiple instances of the same base
2230    type.  */
2231 #define CLASSTYPE_REPEATED_BASE_P(NODE) \
2232   (LANG_TYPE_CLASS_CHECK(NODE)->repeated_base)
2233
2234 /* The member function with which the vtable will be emitted:
2235    the first noninline non-pure-virtual member function.  NULL_TREE
2236    if there is no key function or if this is a class template */
2237 #define CLASSTYPE_KEY_METHOD(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->key_method)
2238
2239 /* Vector of members.  During definition, it is unordered and only
2240    member functions are present.  After completion it is sorted and
2241    contains both member functions and non-functions.  STAT_HACK is
2242    involved to preserve oneslot per name invariant.  */
2243 #define CLASSTYPE_MEMBER_VEC(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->members)
2244
2245 /* For class templates, this is a TREE_LIST of all member data,
2246    functions, types, and friends in the order of declaration.
2247    The TREE_PURPOSE of each TREE_LIST is NULL_TREE for a friend,
2248    and the RECORD_TYPE for the class template otherwise.  */
2249 #define CLASSTYPE_DECL_LIST(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->decl_list)
2250
2251 /* A FUNCTION_DECL or OVERLOAD for the constructors for NODE.  These
2252    are the constructors that take an in-charge parameter.  */
2253 #define CLASSTYPE_CONSTRUCTORS(NODE) \
2254   (get_class_binding_direct (NODE, ctor_identifier))
2255
2256 /* A FUNCTION_DECL for the destructor for NODE.  This is the
2257    destructors that take an in-charge parameter.  If
2258    CLASSTYPE_LAZY_DESTRUCTOR is true, then this entry will be NULL
2259    until the destructor is created with lazily_declare_fn.  */
2260 #define CLASSTYPE_DESTRUCTOR(NODE) \
2261   (get_class_binding_direct (NODE, dtor_identifier))
2262
2263 /* A dictionary of the nested user-defined-types (class-types, or enums)
2264    found within this class.  This table includes nested member class
2265    templates.  */
2266 #define CLASSTYPE_NESTED_UTDS(NODE) \
2267    (LANG_TYPE_CLASS_CHECK (NODE)->nested_udts)
2268
2269 /* Nonzero if NODE has a primary base class, i.e., a base class with
2270    which it shares the virtual function table pointer.  */
2271 #define CLASSTYPE_HAS_PRIMARY_BASE_P(NODE) \
2272   (CLASSTYPE_PRIMARY_BINFO (NODE) != NULL_TREE)
2273
2274 /* If non-NULL, this is the binfo for the primary base class, i.e.,
2275    the base class which contains the virtual function table pointer
2276    for this class.  */
2277 #define CLASSTYPE_PRIMARY_BINFO(NODE) \
2278   (LANG_TYPE_CLASS_CHECK (NODE)->primary_base)
2279
2280 /* A vector of BINFOs for the direct and indirect virtual base classes
2281    that this type uses in a post-order depth-first left-to-right
2282    order.  (In other words, these bases appear in the order that they
2283    should be initialized.)  */
2284 #define CLASSTYPE_VBASECLASSES(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->vbases)
2285
2286 /* The type corresponding to NODE when NODE is used as a base class,
2287    i.e., NODE without virtual base classes or tail padding.  */
2288 #define CLASSTYPE_AS_BASE(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->as_base)
2289
2290 /* True iff NODE is the CLASSTYPE_AS_BASE version of some type.  */
2291 #define IS_FAKE_BASE_TYPE(NODE)                                 \
2292   (TREE_CODE (NODE) == RECORD_TYPE                              \
2293    && TYPE_CONTEXT (NODE) && CLASS_TYPE_P (TYPE_CONTEXT (NODE)) \
2294    && CLASSTYPE_AS_BASE (TYPE_CONTEXT (NODE)) == (NODE))
2295
2296 /* These are the size and alignment of the type without its virtual
2297    base classes, for when we use this type as a base itself.  */
2298 #define CLASSTYPE_SIZE(NODE) TYPE_SIZE (CLASSTYPE_AS_BASE (NODE))
2299 #define CLASSTYPE_SIZE_UNIT(NODE) TYPE_SIZE_UNIT (CLASSTYPE_AS_BASE (NODE))
2300 #define CLASSTYPE_ALIGN(NODE) TYPE_ALIGN (CLASSTYPE_AS_BASE (NODE))
2301 #define CLASSTYPE_USER_ALIGN(NODE) TYPE_USER_ALIGN (CLASSTYPE_AS_BASE (NODE))
2302
2303 /* The alignment of NODE, without its virtual bases, in bytes.  */
2304 #define CLASSTYPE_ALIGN_UNIT(NODE) \
2305   (CLASSTYPE_ALIGN (NODE) / BITS_PER_UNIT)
2306
2307 /* A vec<tree> of virtual functions which cannot be inherited by
2308    derived classes.  When deriving from this type, the derived
2309    class must provide its own definition for each of these functions.  */
2310 #define CLASSTYPE_PURE_VIRTUALS(NODE) \
2311   (LANG_TYPE_CLASS_CHECK (NODE)->pure_virtuals)
2312
2313 /* Nonzero means that this type is an abstract class type.  */
2314 #define ABSTRACT_CLASS_TYPE_P(NODE) \
2315   (CLASS_TYPE_P (NODE) && CLASSTYPE_PURE_VIRTUALS(NODE))
2316
2317 /* Nonzero means that this type has an X() constructor.  */
2318 #define TYPE_HAS_DEFAULT_CONSTRUCTOR(NODE) \
2319   (LANG_TYPE_CLASS_CHECK (NODE)->has_default_ctor)
2320
2321 /* Nonzero means that this type contains a mutable member.  */
2322 #define CLASSTYPE_HAS_MUTABLE(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_mutable)
2323 #define TYPE_HAS_MUTABLE_P(NODE) (cp_has_mutable_p (NODE))
2324
2325 /* Nonzero means that this class type is not POD for the purpose of layout
2326    (as defined in the ABI).  This is different from the language's POD.  */
2327 #define CLASSTYPE_NON_LAYOUT_POD_P(NODE) \
2328   (LANG_TYPE_CLASS_CHECK (NODE)->non_pod_class)
2329
2330 /* Nonzero means that this class type is a non-standard-layout class.  */
2331 #define CLASSTYPE_NON_STD_LAYOUT(NODE) \
2332   (LANG_TYPE_CLASS_CHECK (NODE)->non_std_layout)
2333
2334 /* Nonzero means that this class type does have unique object
2335    representations.  */
2336 #define CLASSTYPE_UNIQUE_OBJ_REPRESENTATIONS(NODE) \
2337   (LANG_TYPE_CLASS_CHECK (NODE)->unique_obj_representations)
2338
2339 /* Nonzero means that this class type has
2340    CLASSTYPE_UNIQUE_OBJ_REPRESENTATIONS computed.  */
2341 #define CLASSTYPE_UNIQUE_OBJ_REPRESENTATIONS_SET(NODE) \
2342   (LANG_TYPE_CLASS_CHECK (NODE)->unique_obj_representations_set)
2343
2344 /* Nonzero means that this class contains pod types whose default
2345    initialization is not a zero initialization (namely, pointers to
2346    data members).  */
2347 #define CLASSTYPE_NON_ZERO_INIT_P(NODE) \
2348   (LANG_TYPE_CLASS_CHECK (NODE)->non_zero_init)
2349
2350 /* Nonzero if this class is "empty" in the sense of the C++ ABI.  */
2351 #define CLASSTYPE_EMPTY_P(NODE) \
2352   (LANG_TYPE_CLASS_CHECK (NODE)->empty_p)
2353
2354 /* Nonzero if this class is "nearly empty", i.e., contains only a
2355    virtual function table pointer.  */
2356 #define CLASSTYPE_NEARLY_EMPTY_P(NODE) \
2357   (LANG_TYPE_CLASS_CHECK (NODE)->nearly_empty_p)
2358
2359 /* Nonzero if this class contains an empty subobject.  */
2360 #define CLASSTYPE_CONTAINS_EMPTY_CLASS_P(NODE) \
2361   (LANG_TYPE_CLASS_CHECK (NODE)->contains_empty_class_p)
2362
2363 /* A list of class types of which this type is a friend.  The
2364    TREE_VALUE is normally a TYPE, but will be a TEMPLATE_DECL in the
2365    case of a template friend.  */
2366 #define CLASSTYPE_FRIEND_CLASSES(NODE) \
2367   (LANG_TYPE_CLASS_CHECK (NODE)->friend_classes)
2368
2369 /* A list of the classes which grant friendship to this class.  */
2370 #define CLASSTYPE_BEFRIENDING_CLASSES(NODE) \
2371   (LANG_TYPE_CLASS_CHECK (NODE)->befriending_classes)
2372
2373 /* The associated LAMBDA_EXPR that made this class.  */
2374 #define CLASSTYPE_LAMBDA_EXPR(NODE) \
2375   (LANG_TYPE_CLASS_CHECK (NODE)->lambda_expr)
2376 /* The extra mangling scope for this closure type.  */
2377 #define LAMBDA_TYPE_EXTRA_SCOPE(NODE) \
2378   (LAMBDA_EXPR_EXTRA_SCOPE (CLASSTYPE_LAMBDA_EXPR (NODE)))
2379
2380 /* Say whether this node was declared as a "class" or a "struct".  */
2381 #define CLASSTYPE_DECLARED_CLASS(NODE) \
2382   (LANG_TYPE_CLASS_CHECK (NODE)->declared_class)
2383
2384 /* Nonzero if this class has const members
2385    which have no specified initialization.  */
2386 #define CLASSTYPE_READONLY_FIELDS_NEED_INIT(NODE)       \
2387   (TYPE_LANG_SPECIFIC (NODE)                            \
2388    ? LANG_TYPE_CLASS_CHECK (NODE)->const_needs_init : 0)
2389 #define SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT(NODE, VALUE) \
2390   (LANG_TYPE_CLASS_CHECK (NODE)->const_needs_init = (VALUE))
2391
2392 /* Nonzero if this class has ref members
2393    which have no specified initialization.  */
2394 #define CLASSTYPE_REF_FIELDS_NEED_INIT(NODE)            \
2395   (TYPE_LANG_SPECIFIC (NODE)                            \
2396    ? LANG_TYPE_CLASS_CHECK (NODE)->ref_needs_init : 0)
2397 #define SET_CLASSTYPE_REF_FIELDS_NEED_INIT(NODE, VALUE) \
2398   (LANG_TYPE_CLASS_CHECK (NODE)->ref_needs_init = (VALUE))
2399
2400 /* Nonzero if this class is included from a header file which employs
2401    `#pragma interface', and it is not included in its implementation file.  */
2402 #define CLASSTYPE_INTERFACE_ONLY(NODE) \
2403   (LANG_TYPE_CLASS_CHECK (NODE)->interface_only)
2404
2405 /* True if we have already determined whether or not vtables, VTTs,
2406    typeinfo, and other similar per-class data should be emitted in
2407    this translation unit.  This flag does not indicate whether or not
2408    these items should be emitted; it only indicates that we know one
2409    way or the other.  */
2410 #define CLASSTYPE_INTERFACE_KNOWN(NODE) \
2411   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown == 0)
2412 /* The opposite of CLASSTYPE_INTERFACE_KNOWN.  */
2413 #define CLASSTYPE_INTERFACE_UNKNOWN(NODE) \
2414   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown)
2415
2416 #define SET_CLASSTYPE_INTERFACE_UNKNOWN_X(NODE,X) \
2417   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown = !!(X))
2418 #define SET_CLASSTYPE_INTERFACE_UNKNOWN(NODE) \
2419   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown = 1)
2420 #define SET_CLASSTYPE_INTERFACE_KNOWN(NODE) \
2421   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown = 0)
2422
2423 /* Nonzero if a _DECL node requires us to output debug info for this class.  */
2424 #define CLASSTYPE_DEBUG_REQUESTED(NODE) \
2425   (LANG_TYPE_CLASS_CHECK (NODE)->debug_requested)
2426 \f
2427 /* Additional macros for inheritance information.  */
2428
2429 /* Nonzero means that this class is on a path leading to a new vtable.  */
2430 #define BINFO_VTABLE_PATH_MARKED(NODE) BINFO_FLAG_1 (NODE)
2431
2432 /* Nonzero means B (a BINFO) has its own vtable.  Any copies will not
2433    have this flag set.  */
2434 #define BINFO_NEW_VTABLE_MARKED(B) (BINFO_FLAG_2 (B))
2435
2436 /* Compare a BINFO_TYPE with another type for equality.  For a binfo,
2437    this is functionally equivalent to using same_type_p, but
2438    measurably faster.  At least one of the arguments must be a
2439    BINFO_TYPE.  The other can be a BINFO_TYPE or a regular type.  If
2440    BINFO_TYPE(T) ever stops being the main variant of the class the
2441    binfo is for, this macro must change.  */
2442 #define SAME_BINFO_TYPE_P(A, B) ((A) == (B))
2443
2444 /* Any subobject that needs a new vtable must have a vptr and must not
2445    be a non-virtual primary base (since it would then use the vtable from a
2446    derived class and never become non-primary.)  */
2447 #define SET_BINFO_NEW_VTABLE_MARKED(B)                                   \
2448   (BINFO_NEW_VTABLE_MARKED (B) = 1,                                      \
2449    gcc_assert (!BINFO_PRIMARY_P (B) || BINFO_VIRTUAL_P (B)),             \
2450    gcc_assert (TYPE_VFIELD (BINFO_TYPE (B))))
2451
2452 /* Nonzero if this binfo is for a dependent base - one that should not
2453    be searched.  */
2454 #define BINFO_DEPENDENT_BASE_P(NODE) BINFO_FLAG_3 (NODE)
2455
2456 /* Nonzero if this binfo has lost its primary base binfo (because that
2457    is a nearly-empty virtual base that has been taken by some other
2458    base in the complete hierarchy.  */
2459 #define BINFO_LOST_PRIMARY_P(NODE) BINFO_FLAG_4 (NODE)
2460
2461 /* Nonzero if this BINFO is a primary base class.  */
2462 #define BINFO_PRIMARY_P(NODE) BINFO_FLAG_5(NODE)
2463 \f
2464 /* A vec<tree_pair_s> of the vcall indices associated with the class
2465    NODE.  The PURPOSE of each element is a FUNCTION_DECL for a virtual
2466    function.  The VALUE is the index into the virtual table where the
2467    vcall offset for that function is stored, when NODE is a virtual
2468    base.  */
2469 #define CLASSTYPE_VCALL_INDICES(NODE) \
2470   (LANG_TYPE_CLASS_CHECK (NODE)->vcall_indices)
2471
2472 /* The various vtables for the class NODE.  The primary vtable will be
2473    first, followed by the construction vtables and VTT, if any.  */
2474 #define CLASSTYPE_VTABLES(NODE) \
2475   (LANG_TYPE_CLASS_CHECK (NODE)->vtables)
2476
2477 /* The std::type_info variable representing this class, or NULL if no
2478    such variable has been created.  This field is only set for the
2479    TYPE_MAIN_VARIANT of the class.  */
2480 #define CLASSTYPE_TYPEINFO_VAR(NODE) \
2481   (LANG_TYPE_CLASS_CHECK (NODE)->typeinfo_var)
2482
2483 /* Accessor macros for the BINFO_VIRTUALS list.  */
2484
2485 /* The number of bytes by which to adjust the `this' pointer when
2486    calling this virtual function.  Subtract this value from the this
2487    pointer. Always non-NULL, might be constant zero though.  */
2488 #define BV_DELTA(NODE) (TREE_PURPOSE (NODE))
2489
2490 /* If non-NULL, the vtable index at which to find the vcall offset
2491    when calling this virtual function.  Add the value at that vtable
2492    index to the this pointer.  */
2493 #define BV_VCALL_INDEX(NODE) (TREE_TYPE (NODE))
2494
2495 /* The function to call.  */
2496 #define BV_FN(NODE) (TREE_VALUE (NODE))
2497
2498 /* Whether or not this entry is for a lost primary virtual base.  */
2499 #define BV_LOST_PRIMARY(NODE) (TREE_LANG_FLAG_0 (NODE))
2500 \f
2501 /* For FUNCTION_TYPE or METHOD_TYPE, a list of the exceptions that
2502    this type can raise.  Each TREE_VALUE is a _TYPE.  The TREE_VALUE
2503    will be NULL_TREE to indicate a throw specification of `()', or
2504    no exceptions allowed.  For a noexcept specification, TREE_VALUE
2505    is NULL_TREE and TREE_PURPOSE is the constant-expression.  For
2506    a deferred noexcept-specification, TREE_PURPOSE is a DEFERRED_NOEXCEPT
2507    (for templates) or an OVERLOAD list of functions (for implicitly
2508    declared functions).  */
2509 #define TYPE_RAISES_EXCEPTIONS(NODE) \
2510   TYPE_LANG_SLOT_1 (FUNC_OR_METHOD_CHECK (NODE))
2511
2512 /* For FUNCTION_TYPE or METHOD_TYPE, return 1 iff it is declared `throw()'
2513    or noexcept(true).  */
2514 #define TYPE_NOTHROW_P(NODE) nothrow_spec_p (TYPE_RAISES_EXCEPTIONS (NODE))
2515
2516 /* For FUNCTION_TYPE or METHOD_TYPE, true if NODE is noexcept.  This is the
2517    case for things declared noexcept(true) and, with -fnothrow-opt, for
2518    throw() functions.  */
2519 #define TYPE_NOEXCEPT_P(NODE) type_noexcept_p (NODE)
2520
2521 /* The binding level associated with the namespace.  */
2522 #define NAMESPACE_LEVEL(NODE) \
2523   (LANG_DECL_NS_CHECK (NODE)->level)
2524 \f
2525 /* Discriminator values for lang_decl.  */
2526
2527 enum lang_decl_selector
2528 {
2529   lds_min,
2530   lds_fn,
2531   lds_ns,
2532   lds_parm,
2533   lds_decomp
2534 };
2535
2536 /* Flags shared by all forms of DECL_LANG_SPECIFIC.
2537
2538    Some of the flags live here only to make lang_decl_min/fn smaller.  Do
2539    not make this struct larger than 32 bits; instead, make sel smaller.  */
2540
2541 struct GTY(()) lang_decl_base {
2542   /* Larger than necessary for faster access.  */
2543   ENUM_BITFIELD(lang_decl_selector) selector : 16;
2544   ENUM_BITFIELD(languages) language : 1;
2545   unsigned use_template : 2;
2546   unsigned not_really_extern : 1;          /* var or fn */
2547   unsigned initialized_in_class : 1;       /* var or fn */
2548   unsigned repo_available_p : 1;           /* var or fn */
2549   unsigned threadprivate_or_deleted_p : 1; /* var or fn */
2550   unsigned anticipated_p : 1;              /* fn, type or template */
2551   /* anticipated_p reused as DECL_OMP_PRIVATIZED_MEMBER in var */
2552   unsigned friend_or_tls : 1;              /* var, fn, type or template */
2553   unsigned unknown_bound_p : 1;            /* var */
2554   unsigned odr_used : 1;                   /* var or fn */
2555   unsigned spare : 1;
2556   unsigned concept_p : 1;                  /* applies to vars and functions */
2557   unsigned var_declared_inline_p : 1;      /* var */
2558   unsigned dependent_init_p : 1;           /* var */
2559   /* 1 spare bit */
2560 };
2561
2562 /* True for DECL codes which have template info and access.  */
2563 #define LANG_DECL_HAS_MIN(NODE)                 \
2564   (VAR_OR_FUNCTION_DECL_P (NODE)                \
2565    || TREE_CODE (NODE) == FIELD_DECL            \
2566    || TREE_CODE (NODE) == CONST_DECL            \
2567    || TREE_CODE (NODE) == TYPE_DECL             \
2568    || TREE_CODE (NODE) == TEMPLATE_DECL         \
2569    || TREE_CODE (NODE) == USING_DECL)
2570
2571 /* DECL_LANG_SPECIFIC for the above codes.  */
2572
2573 struct GTY(()) lang_decl_min {
2574   struct lang_decl_base base;
2575
2576   /* In a FUNCTION_DECL for which DECL_THUNK_P holds, this is
2577      THUNK_ALIAS.
2578      In a FUNCTION_DECL for which DECL_THUNK_P does not hold,
2579      VAR_DECL, TYPE_DECL, or TEMPLATE_DECL, this is
2580      DECL_TEMPLATE_INFO.  */
2581   tree template_info;
2582
2583   /* In a DECL_THUNK_P FUNCTION_DECL, this is THUNK_VIRTUAL_OFFSET.
2584      In a lambda-capture proxy VAR_DECL, this is DECL_CAPTURED_VARIABLE.
2585      In a function-scope TREE_STATIC VAR_DECL or IMPLICIT_TYPEDEF_P TYPE_DECL,
2586      this is DECL_DISCRIMINATOR.
2587      Otherwise, in a class-scope DECL, this is DECL_ACCESS.   */
2588   tree access;
2589 };
2590
2591 /* Additional DECL_LANG_SPECIFIC information for functions.  */
2592
2593 struct GTY(()) lang_decl_fn {
2594   struct lang_decl_min min;
2595
2596   /* In a overloaded operator, this is the compressed operator code.  */
2597   unsigned ovl_op_code : 6;
2598   unsigned global_ctor_p : 1;
2599   unsigned global_dtor_p : 1;
2600
2601   unsigned static_function : 1;
2602   unsigned pure_virtual : 1;
2603   unsigned defaulted_p : 1;
2604   unsigned has_in_charge_parm_p : 1;
2605   unsigned has_vtt_parm_p : 1;
2606   unsigned pending_inline_p : 1;
2607   unsigned nonconverting : 1;
2608   unsigned thunk_p : 1;
2609
2610   unsigned this_thunk_p : 1;
2611   unsigned hidden_friend_p : 1;
2612   unsigned omp_declare_reduction_p : 1;
2613   unsigned has_dependent_explicit_spec_p : 1;
2614   unsigned spare : 12;
2615
2616   /* 32-bits padding on 64-bit host.  */
2617
2618   /* For a non-thunk function decl, this is a tree list of
2619      friendly classes. For a thunk function decl, it is the
2620      thunked to function decl.  */
2621   tree befriending_classes;
2622
2623   /* For a non-virtual FUNCTION_DECL, this is
2624      DECL_FRIEND_CONTEXT.  For a virtual FUNCTION_DECL for which
2625      DECL_THIS_THUNK_P does not hold, this is DECL_THUNKS. Both
2626      this pointer and result pointer adjusting thunks are
2627      chained here.  This pointer thunks to return pointer thunks
2628      will be chained on the return pointer thunk.  */
2629   tree context;
2630
2631   union lang_decl_u5
2632   {
2633     /* In a non-thunk FUNCTION_DECL or TEMPLATE_DECL, this is
2634        DECL_CLONED_FUNCTION.  */
2635     tree GTY ((tag ("0"))) cloned_function;
2636
2637     /* In a FUNCTION_DECL for which THUNK_P holds this is the
2638        THUNK_FIXED_OFFSET.  */
2639     HOST_WIDE_INT GTY ((tag ("1"))) fixed_offset;
2640   } GTY ((desc ("%1.thunk_p"))) u5;
2641
2642   union lang_decl_u3
2643   {
2644     struct cp_token_cache * GTY ((tag ("1"))) pending_inline_info;
2645     struct language_function * GTY ((tag ("0")))
2646       saved_language_function;
2647   } GTY ((desc ("%1.pending_inline_p"))) u;
2648
2649 };
2650
2651 /* DECL_LANG_SPECIFIC for namespaces.  */
2652
2653 struct GTY(()) lang_decl_ns {
2654   struct lang_decl_base base;
2655   cp_binding_level *level;
2656
2657   /* using directives and inline children.  These need to be va_gc,
2658      because of PCH.  */
2659   vec<tree, va_gc> *usings;
2660   vec<tree, va_gc> *inlinees;
2661
2662   /* Hash table of bound decls. It'd be nice to have this inline, but
2663      as the hash_map has a dtor, we can't then put this struct into a
2664      union (until moving to c++11).  */
2665   hash_table<named_decl_hash> *bindings;
2666 };
2667
2668 /* DECL_LANG_SPECIFIC for parameters.  */
2669
2670 struct GTY(()) lang_decl_parm {
2671   struct lang_decl_base base;
2672   int level;
2673   int index;
2674 };
2675
2676 /* Additional DECL_LANG_SPECIFIC information for structured bindings.  */
2677
2678 struct GTY(()) lang_decl_decomp {
2679   struct lang_decl_min min;
2680   /* The artificial underlying "e" variable of the structured binding
2681      variable.  */
2682   tree base;
2683 };
2684
2685 /* DECL_LANG_SPECIFIC for all types.  It would be nice to just make this a
2686    union rather than a struct containing a union as its only field, but
2687    tree.h declares it as a struct.  */
2688
2689 struct GTY(()) lang_decl {
2690   union GTY((desc ("%h.base.selector"))) lang_decl_u {
2691      /* Nothing of only the base type exists.  */
2692     struct lang_decl_base GTY ((default)) base;
2693     struct lang_decl_min GTY((tag ("lds_min"))) min;
2694     struct lang_decl_fn GTY ((tag ("lds_fn"))) fn;
2695     struct lang_decl_ns GTY((tag ("lds_ns"))) ns;
2696     struct lang_decl_parm GTY((tag ("lds_parm"))) parm;
2697     struct lang_decl_decomp GTY((tag ("lds_decomp"))) decomp;
2698   } u;
2699 };
2700
2701 /* Looks through a template (if present) to find what it declares.  */
2702 #define STRIP_TEMPLATE(NODE) \
2703   (TREE_CODE (NODE) == TEMPLATE_DECL ? DECL_TEMPLATE_RESULT (NODE) : NODE)
2704
2705 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
2706
2707 #define LANG_DECL_MIN_CHECK(NODE) __extension__                 \
2708 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);            \
2709    if (!LANG_DECL_HAS_MIN (NODE))                               \
2710      lang_check_failed (__FILE__, __LINE__, __FUNCTION__);      \
2711    &lt->u.min; })
2712
2713 /* We want to be able to check DECL_CONSTRUCTOR_P and such on a function
2714    template, not just on a FUNCTION_DECL.  So when looking for things in
2715    lang_decl_fn, look down through a TEMPLATE_DECL into its result.  */
2716 #define LANG_DECL_FN_CHECK(NODE) __extension__                          \
2717 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (STRIP_TEMPLATE (NODE));   \
2718    if (!DECL_DECLARES_FUNCTION_P (NODE)                                 \
2719        || lt->u.base.selector != lds_fn)                                \
2720      lang_check_failed (__FILE__, __LINE__, __FUNCTION__);              \
2721    &lt->u.fn; })
2722
2723 #define LANG_DECL_NS_CHECK(NODE) __extension__                          \
2724 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);                    \
2725    if (TREE_CODE (NODE) != NAMESPACE_DECL                               \
2726        || lt->u.base.selector != lds_ns)                                \
2727      lang_check_failed (__FILE__, __LINE__, __FUNCTION__);              \
2728    &lt->u.ns; })
2729
2730 #define LANG_DECL_PARM_CHECK(NODE) __extension__                \
2731 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);            \
2732   if (TREE_CODE (NODE) != PARM_DECL                             \
2733       || lt->u.base.selector != lds_parm)                       \
2734     lang_check_failed (__FILE__, __LINE__, __FUNCTION__);       \
2735   &lt->u.parm; })
2736
2737 #define LANG_DECL_DECOMP_CHECK(NODE) __extension__              \
2738 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);            \
2739   if (!VAR_P (NODE)                                             \
2740       || lt->u.base.selector != lds_decomp)                     \
2741     lang_check_failed (__FILE__, __LINE__, __FUNCTION__);       \
2742   &lt->u.decomp; })
2743
2744 #else
2745
2746 #define LANG_DECL_MIN_CHECK(NODE) \
2747   (&DECL_LANG_SPECIFIC (NODE)->u.min)
2748
2749 #define LANG_DECL_FN_CHECK(NODE) \
2750   (&DECL_LANG_SPECIFIC (STRIP_TEMPLATE (NODE))->u.fn)
2751
2752 #define LANG_DECL_NS_CHECK(NODE) \
2753   (&DECL_LANG_SPECIFIC (NODE)->u.ns)
2754
2755 #define LANG_DECL_PARM_CHECK(NODE) \
2756   (&DECL_LANG_SPECIFIC (NODE)->u.parm)
2757
2758 #define LANG_DECL_DECOMP_CHECK(NODE) \
2759   (&DECL_LANG_SPECIFIC (NODE)->u.decomp)
2760
2761 #endif /* ENABLE_TREE_CHECKING */
2762
2763 /* For a FUNCTION_DECL or a VAR_DECL, the language linkage for the
2764    declaration.  Some entities (like a member function in a local
2765    class, or a local variable) do not have linkage at all, and this
2766    macro should not be used in those cases.
2767
2768    Implementation note: A FUNCTION_DECL without DECL_LANG_SPECIFIC was
2769    created by language-independent code, and has C linkage.  Most
2770    VAR_DECLs have C++ linkage, and do not have DECL_LANG_SPECIFIC, but
2771    we do create DECL_LANG_SPECIFIC for variables with non-C++ linkage.  */
2772 #define DECL_LANGUAGE(NODE)                             \
2773   (DECL_LANG_SPECIFIC (NODE)                            \
2774    ? DECL_LANG_SPECIFIC (NODE)->u.base.language         \
2775    : (TREE_CODE (NODE) == FUNCTION_DECL                 \
2776       ? lang_c : lang_cplusplus))
2777
2778 /* Set the language linkage for NODE to LANGUAGE.  */
2779 #define SET_DECL_LANGUAGE(NODE, LANGUAGE) \
2780   (DECL_LANG_SPECIFIC (NODE)->u.base.language = (LANGUAGE))
2781
2782 /* For FUNCTION_DECLs and TEMPLATE_DECLs: nonzero means that this function
2783    is a constructor.  */
2784 #define DECL_CONSTRUCTOR_P(NODE) \
2785   DECL_CXX_CONSTRUCTOR_P (STRIP_TEMPLATE (NODE))
2786
2787 /* Nonzero if NODE (a FUNCTION_DECL) is a constructor for a complete
2788    object.  */
2789 #define DECL_COMPLETE_CONSTRUCTOR_P(NODE)               \
2790   (DECL_NAME (NODE) == complete_ctor_identifier)
2791
2792 /* Nonzero if NODE (a FUNCTION_DECL) is a constructor for a base
2793    object.  */
2794 #define DECL_BASE_CONSTRUCTOR_P(NODE)           \
2795   (DECL_NAME (NODE) == base_ctor_identifier)
2796
2797 /* Nonzero if NODE (a FUNCTION_DECL) is a constructor, but not either the
2798    specialized in-charge constructor or the specialized not-in-charge
2799    constructor.  */
2800 #define DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P(NODE)                \
2801   (DECL_NAME (NODE) == ctor_identifier)
2802
2803 /* Nonzero if NODE (a FUNCTION_DECL) is a copy constructor.  */
2804 #define DECL_COPY_CONSTRUCTOR_P(NODE) \
2805   (DECL_CONSTRUCTOR_P (NODE) && copy_fn_p (NODE) > 0)
2806
2807 /* Nonzero if NODE (a FUNCTION_DECL) is a move constructor.  */
2808 #define DECL_MOVE_CONSTRUCTOR_P(NODE) \
2809   (DECL_CONSTRUCTOR_P (NODE) && move_fn_p (NODE))
2810
2811 /* Nonzero if NODE (a FUNCTION_DECL or TEMPLATE_DECL)
2812    is a destructor.  */
2813 #define DECL_DESTRUCTOR_P(NODE)                         \
2814   DECL_CXX_DESTRUCTOR_P (STRIP_TEMPLATE (NODE))
2815
2816 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor, but not the
2817    specialized in-charge constructor, in-charge deleting constructor,
2818    or the base destructor.  */
2819 #define DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P(NODE)                 \
2820   (DECL_NAME (NODE) == dtor_identifier)
2821
2822 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor for a complete
2823    object.  */
2824 #define DECL_COMPLETE_DESTRUCTOR_P(NODE)                \
2825   (DECL_NAME (NODE) == complete_dtor_identifier)
2826
2827 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor for a base
2828    object.  */
2829 #define DECL_BASE_DESTRUCTOR_P(NODE)            \
2830   (DECL_NAME (NODE) == base_dtor_identifier)
2831
2832 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor for a complete
2833    object that deletes the object after it has been destroyed.  */
2834 #define DECL_DELETING_DESTRUCTOR_P(NODE)                \
2835   (DECL_NAME (NODE) == deleting_dtor_identifier)
2836
2837 /* Nonzero if either DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P or
2838    DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P is true of NODE.  */
2839 #define DECL_MAYBE_IN_CHARGE_CDTOR_P(NODE)              \
2840   (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (NODE)            \
2841    || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (NODE))
2842
2843 /* Nonzero if NODE (a FUNCTION_DECL) is a cloned constructor or
2844    destructor.  */
2845 #define DECL_CLONED_FUNCTION_P(NODE) (!!decl_cloned_function_p (NODE, true))
2846
2847 /* If DECL_CLONED_FUNCTION_P holds, this is the function that was
2848    cloned.  */
2849 #define DECL_CLONED_FUNCTION(NODE) (*decl_cloned_function_p (NODE, false))
2850
2851 /* Perform an action for each clone of FN, if FN is a function with
2852    clones.  This macro should be used like:
2853
2854       FOR_EACH_CLONE (clone, fn)
2855         { ... }
2856
2857   */
2858 #define FOR_EACH_CLONE(CLONE, FN)                       \
2859   if (!(TREE_CODE (FN) == FUNCTION_DECL                 \
2860         && DECL_MAYBE_IN_CHARGE_CDTOR_P (FN)))          \
2861     ;                                                   \
2862   else                                                  \
2863     for (CLONE = DECL_CHAIN (FN);                       \
2864          CLONE && DECL_CLONED_FUNCTION_P (CLONE);       \
2865          CLONE = DECL_CHAIN (CLONE))
2866
2867 /* Nonzero if NODE has DECL_DISCRIMINATOR and not DECL_ACCESS.  */
2868 #define DECL_DISCRIMINATOR_P(NODE)                              \
2869   (((TREE_CODE (NODE) == VAR_DECL && TREE_STATIC (NODE))        \
2870     || DECL_IMPLICIT_TYPEDEF_P (NODE))                          \
2871    && DECL_FUNCTION_SCOPE_P (NODE))
2872
2873 /* Discriminator for name mangling.  */
2874 #define DECL_DISCRIMINATOR(NODE) (LANG_DECL_MIN_CHECK (NODE)->access)
2875
2876 /* The index of a user-declared parameter in its function, starting at 1.
2877    All artificial parameters will have index 0.  */
2878 #define DECL_PARM_INDEX(NODE) \
2879   (LANG_DECL_PARM_CHECK (NODE)->index)
2880
2881 /* The level of a user-declared parameter in its function, starting at 1.
2882    A parameter of the function will have level 1; a parameter of the first
2883    nested function declarator (i.e. t in void f (void (*p)(T t))) will have
2884    level 2.  */
2885 #define DECL_PARM_LEVEL(NODE) \
2886   (LANG_DECL_PARM_CHECK (NODE)->level)
2887
2888 /* Nonzero if the VTT parm has been added to NODE.  */
2889 #define DECL_HAS_VTT_PARM_P(NODE) \
2890   (LANG_DECL_FN_CHECK (NODE)->has_vtt_parm_p)
2891
2892 /* Nonzero if NODE is a FUNCTION_DECL for which a VTT parameter is
2893    required.  */
2894 #define DECL_NEEDS_VTT_PARM_P(NODE)                     \
2895   (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (NODE))         \
2896    && (DECL_BASE_CONSTRUCTOR_P (NODE)                   \
2897        || DECL_BASE_DESTRUCTOR_P (NODE)))
2898
2899 /* Nonzero if NODE is a user-defined conversion operator.  */
2900 #define DECL_CONV_FN_P(NODE) IDENTIFIER_CONV_OP_P (DECL_NAME (NODE))
2901
2902 /* The type to which conversion operator FN converts to.   */
2903 #define DECL_CONV_FN_TYPE(FN) \
2904   TREE_TYPE ((gcc_checking_assert (DECL_CONV_FN_P (FN)), DECL_NAME (FN)))
2905
2906 /* Nonzero if NODE, a static data member, was declared in its class as an
2907    array of unknown bound.  */
2908 #define VAR_HAD_UNKNOWN_BOUND(NODE)                     \
2909   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))           \
2910    ? DECL_LANG_SPECIFIC (NODE)->u.base.unknown_bound_p  \
2911    : false)
2912 #define SET_VAR_HAD_UNKNOWN_BOUND(NODE) \
2913   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.unknown_bound_p = true)
2914
2915 /* True iff decl NODE is for an overloaded operator.  */
2916 #define DECL_OVERLOADED_OPERATOR_P(NODE)                \
2917   IDENTIFIER_ANY_OP_P (DECL_NAME (NODE))
2918
2919 /* Nonzero if NODE is an assignment operator (including += and such).  */
2920 #define DECL_ASSIGNMENT_OPERATOR_P(NODE)                 \
2921   IDENTIFIER_ASSIGN_OP_P (DECL_NAME (NODE))
2922
2923 /* NODE is a function_decl for an overloaded operator.  Return its
2924    compressed (raw) operator code.  Note that this is not a TREE_CODE.  */
2925 #define DECL_OVERLOADED_OPERATOR_CODE_RAW(NODE)         \
2926   (LANG_DECL_FN_CHECK (NODE)->ovl_op_code)
2927
2928 /* DECL is an overloaded operator.  Test whether it is for TREE_CODE
2929    (a literal constant).  */
2930 #define DECL_OVERLOADED_OPERATOR_IS(DECL, CODE)                 \
2931   (DECL_OVERLOADED_OPERATOR_CODE_RAW (DECL) == OVL_OP_##CODE)
2932
2933 /* For FUNCTION_DECLs: nonzero means that this function is a
2934    constructor or a destructor with an extra in-charge parameter to
2935    control whether or not virtual bases are constructed.  */
2936 #define DECL_HAS_IN_CHARGE_PARM_P(NODE) \
2937   (LANG_DECL_FN_CHECK (NODE)->has_in_charge_parm_p)
2938
2939 /* Nonzero if DECL is a declaration of __builtin_constant_p.  */
2940 #define DECL_IS_BUILTIN_CONSTANT_P(NODE)                \
2941  (TREE_CODE (NODE) == FUNCTION_DECL                     \
2942   && DECL_BUILT_IN_CLASS (NODE) == BUILT_IN_NORMAL      \
2943   && DECL_FUNCTION_CODE (NODE) == BUILT_IN_CONSTANT_P)
2944
2945 /* Nonzero for _DECL means that this decl appears in (or will appear
2946    in) as a member in a RECORD_TYPE or UNION_TYPE node.  It is also for
2947    detecting circularity in case members are multiply defined.  In the
2948    case of a VAR_DECL, it is also used to determine how program storage
2949    should be allocated.  */
2950 #define DECL_IN_AGGR_P(NODE) (DECL_LANG_FLAG_3 (NODE))
2951
2952 /* Nonzero for a VAR_DECL means that the variable's initialization (if
2953    any) has been processed.  (In general, DECL_INITIALIZED_P is
2954    !DECL_EXTERNAL, but static data members may be initialized even if
2955    not defined.)  */
2956 #define DECL_INITIALIZED_P(NODE) \
2957    (TREE_LANG_FLAG_1 (VAR_DECL_CHECK (NODE)))
2958
2959 /* Nonzero for a VAR_DECL iff an explicit initializer was provided
2960    or a non-trivial constructor is called.  */
2961 #define DECL_NONTRIVIALLY_INITIALIZED_P(NODE)   \
2962    (TREE_LANG_FLAG_3 (VAR_DECL_CHECK (NODE)))
2963
2964 /* Nonzero for a VAR_DECL that was initialized with a
2965    constant-expression.  */
2966 #define DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P(NODE) \
2967   (TREE_LANG_FLAG_2 (VAR_DECL_CHECK (NODE)))
2968
2969 /* Nonzero if the DECL was initialized in the class definition itself,
2970    rather than outside the class.  This is used for both static member
2971    VAR_DECLS, and FUNCTION_DECLS that are defined in the class.  */
2972 #define DECL_INITIALIZED_IN_CLASS_P(DECL) \
2973   (DECL_LANG_SPECIFIC (VAR_OR_FUNCTION_DECL_CHECK (DECL)) \
2974    ->u.base.initialized_in_class)
2975
2976 /* Nonzero if the DECL is used in the sense of 3.2 [basic.def.odr].
2977    Only available for decls with DECL_LANG_SPECIFIC.  */
2978 #define DECL_ODR_USED(DECL) \
2979   (DECL_LANG_SPECIFIC (VAR_OR_FUNCTION_DECL_CHECK (DECL)) \
2980    ->u.base.odr_used)
2981
2982 /* Nonzero for DECL means that this decl is just a friend declaration,
2983    and should not be added to the list of members for this class.  */
2984 #define DECL_FRIEND_P(NODE) \
2985   (DECL_LANG_SPECIFIC (TYPE_FUNCTION_OR_TEMPLATE_DECL_CHECK (NODE)) \
2986    ->u.base.friend_or_tls)
2987
2988 /* Nonzero if the thread-local variable was declared with __thread as
2989    opposed to thread_local.  */
2990 #define DECL_GNU_TLS_P(NODE)                            \
2991   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))           \
2992    && DECL_LANG_SPECIFIC (NODE)->u.base.friend_or_tls)
2993 #define SET_DECL_GNU_TLS_P(NODE)                                \
2994   (retrofit_lang_decl (VAR_DECL_CHECK (NODE)),                  \
2995    DECL_LANG_SPECIFIC (NODE)->u.base.friend_or_tls = true)
2996
2997 /* A TREE_LIST of the types which have befriended this FUNCTION_DECL.  */
2998 #define DECL_BEFRIENDING_CLASSES(NODE) \
2999   (LANG_DECL_FN_CHECK (NODE)->befriending_classes)
3000
3001 /* Nonzero for FUNCTION_DECL means that this decl is a static
3002    member function.  */
3003 #define DECL_STATIC_FUNCTION_P(NODE) \
3004   (LANG_DECL_FN_CHECK (NODE)->static_function)
3005
3006 /* Nonzero for FUNCTION_DECL means that this decl is a non-static
3007    member function.  */
3008 #define DECL_NONSTATIC_MEMBER_FUNCTION_P(NODE) \
3009   (TREE_CODE (TREE_TYPE (NODE)) == METHOD_TYPE)
3010
3011 /* Nonzero for FUNCTION_DECL means that this decl is a member function
3012    (static or non-static).  */
3013 #define DECL_FUNCTION_MEMBER_P(NODE) \
3014   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE) || DECL_STATIC_FUNCTION_P (NODE))
3015
3016 /* Nonzero for FUNCTION_DECL means that this member function
3017    has `this' as const X *const.  */
3018 #define DECL_CONST_MEMFUNC_P(NODE)                                       \
3019   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE)                               \
3020    && CP_TYPE_CONST_P (TREE_TYPE (TREE_VALUE                             \
3021                                   (TYPE_ARG_TYPES (TREE_TYPE (NODE))))))
3022
3023 /* Nonzero for FUNCTION_DECL means that this member function
3024    has `this' as volatile X *const.  */
3025 #define DECL_VOLATILE_MEMFUNC_P(NODE)                                    \
3026   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE)                               \
3027    && CP_TYPE_VOLATILE_P (TREE_TYPE (TREE_VALUE                          \
3028                                   (TYPE_ARG_TYPES (TREE_TYPE (NODE))))))
3029
3030 /* Nonzero for a DECL means that this member is a non-static member.  */
3031 #define DECL_NONSTATIC_MEMBER_P(NODE)           \
3032   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE)      \
3033    || TREE_CODE (NODE) == FIELD_DECL)
3034
3035 /* Nonzero for _DECL means that this member object type
3036    is mutable.  */
3037 #define DECL_MUTABLE_P(NODE) (DECL_LANG_FLAG_0 (NODE))
3038
3039 /* Nonzero for _DECL means that this constructor or conversion function is
3040    non-converting.  */
3041 #define DECL_NONCONVERTING_P(NODE) \
3042   (LANG_DECL_FN_CHECK (NODE)->nonconverting)
3043
3044 /* Nonzero for FUNCTION_DECL means that this member function is a pure
3045    virtual function.  */
3046 #define DECL_PURE_VIRTUAL_P(NODE) \
3047   (LANG_DECL_FN_CHECK (NODE)->pure_virtual)
3048
3049 /* Nonzero for FUNCTION_DECL means that this member function (either
3050    a constructor or a conversion function) has an explicit specifier
3051    with a value-dependent expression.  */
3052 #define DECL_HAS_DEPENDENT_EXPLICIT_SPEC_P(NODE) \
3053   (LANG_DECL_FN_CHECK (NODE)->has_dependent_explicit_spec_p)
3054
3055 /* True (in a FUNCTION_DECL) if NODE is a virtual function that is an
3056    invalid overrider for a function from a base class.  Once we have
3057    complained about an invalid overrider we avoid complaining about it
3058    again.  */
3059 #define DECL_INVALID_OVERRIDER_P(NODE) \
3060   (DECL_LANG_FLAG_4 (NODE))
3061
3062 /* True (in a FUNCTION_DECL) if NODE is a function declared with
3063    an override virt-specifier */
3064 #define DECL_OVERRIDE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
3065
3066 /* The thunks associated with NODE, a FUNCTION_DECL.  */
3067 #define DECL_THUNKS(NODE) \
3068   (DECL_VIRTUAL_P (NODE) ? LANG_DECL_FN_CHECK (NODE)->context : NULL_TREE)
3069
3070 /* Set DECL_THUNKS.  */
3071 #define SET_DECL_THUNKS(NODE,THUNKS) \
3072   (LANG_DECL_FN_CHECK (NODE)->context = (THUNKS))
3073
3074 /* If NODE, a FUNCTION_DECL, is a C++11 inheriting constructor, then this
3075    is the constructor it inherits from.  */
3076 #define DECL_INHERITED_CTOR(NODE) \
3077   (DECL_DECLARES_FUNCTION_P (NODE) && DECL_CONSTRUCTOR_P (NODE) \
3078    ? LANG_DECL_FN_CHECK (NODE)->context : NULL_TREE)
3079
3080 /* And this is the base that constructor comes from.  */
3081 #define DECL_INHERITED_CTOR_BASE(NODE)                  \
3082   (DECL_INHERITED_CTOR (NODE)                           \
3083    ? DECL_CONTEXT (flag_new_inheriting_ctors            \
3084                    ? strip_inheriting_ctors (NODE)      \
3085                    : DECL_INHERITED_CTOR (NODE))        \
3086    : NULL_TREE)
3087
3088 /* Set the inherited base.  */
3089 #define SET_DECL_INHERITED_CTOR(NODE,INH) \
3090   (LANG_DECL_FN_CHECK (NODE)->context = (INH))
3091
3092 /* Nonzero if NODE is a thunk, rather than an ordinary function.  */
3093 #define DECL_THUNK_P(NODE)                      \
3094   (TREE_CODE (NODE) == FUNCTION_DECL            \
3095    && DECL_LANG_SPECIFIC (NODE)                 \
3096    && LANG_DECL_FN_CHECK (NODE)->thunk_p)
3097
3098 /* Set DECL_THUNK_P for node.  */
3099 #define SET_DECL_THUNK_P(NODE, THIS_ADJUSTING)                  \
3100   (LANG_DECL_FN_CHECK (NODE)->thunk_p = 1,                      \
3101    LANG_DECL_FN_CHECK (NODE)->this_thunk_p = (THIS_ADJUSTING))
3102
3103 /* Nonzero if NODE is a this pointer adjusting thunk.  */
3104 #define DECL_THIS_THUNK_P(NODE)                 \
3105   (DECL_THUNK_P (NODE) && LANG_DECL_FN_CHECK (NODE)->this_thunk_p)
3106
3107 /* Nonzero if NODE is a result pointer adjusting thunk.  */
3108 #define DECL_RESULT_THUNK_P(NODE)                       \
3109   (DECL_THUNK_P (NODE) && !LANG_DECL_FN_CHECK (NODE)->this_thunk_p)
3110
3111 /* Nonzero if NODE is a FUNCTION_DECL, but not a thunk.  */
3112 #define DECL_NON_THUNK_FUNCTION_P(NODE)                         \
3113   (TREE_CODE (NODE) == FUNCTION_DECL && !DECL_THUNK_P (NODE))
3114
3115 /* Nonzero if NODE is `extern "C"'.  */
3116 #define DECL_EXTERN_C_P(NODE) \
3117   (DECL_LANGUAGE (NODE) == lang_c)
3118
3119 /* Nonzero if NODE is an `extern "C"' function.  */
3120 #define DECL_EXTERN_C_FUNCTION_P(NODE) \
3121   (DECL_NON_THUNK_FUNCTION_P (NODE) && DECL_EXTERN_C_P (NODE))
3122
3123 /* True iff DECL is an entity with vague linkage whose definition is
3124    available in this translation unit.  */
3125 #define DECL_REPO_AVAILABLE_P(NODE) \
3126   (DECL_LANG_SPECIFIC (NODE)->u.base.repo_available_p)
3127
3128 /* True if DECL is declared 'constexpr'.  */
3129 #define DECL_DECLARED_CONSTEXPR_P(DECL) \
3130   DECL_LANG_FLAG_8 (VAR_OR_FUNCTION_DECL_CHECK (STRIP_TEMPLATE (DECL)))
3131
3132 // True if NODE was declared as 'concept'.  The flag implies that the
3133 // declaration is constexpr, that the declaration cannot be specialized or
3134 // refined, and that the result type must be convertible to bool.
3135 #define DECL_DECLARED_CONCEPT_P(NODE) \
3136   (DECL_LANG_SPECIFIC (NODE)->u.base.concept_p)
3137
3138 /* Nonzero if this DECL is the __PRETTY_FUNCTION__ variable in a
3139    template function.  */
3140 #define DECL_PRETTY_FUNCTION_P(NODE) \
3141   (DECL_NAME (NODE) \
3142    && id_equal (DECL_NAME (NODE), "__PRETTY_FUNCTION__"))
3143
3144 /* For a DECL, true if it is __func__ or similar.  */
3145 #define DECL_FNAME_P(NODE)                                      \
3146   (VAR_P (NODE) && DECL_NAME (NODE) && DECL_ARTIFICIAL (NODE)   \
3147    && DECL_HAS_VALUE_EXPR_P (NODE)                              \
3148    && (id_equal (DECL_NAME (NODE), "__PRETTY_FUNCTION__")       \
3149        || id_equal (DECL_NAME (NODE), "__FUNCTION__")           \
3150        || id_equal (DECL_NAME (NODE), "__func__")))
3151
3152 /* Nonzero if the variable was declared to be thread-local.
3153    We need a special C++ version of this test because the middle-end
3154    DECL_THREAD_LOCAL_P uses the symtab, so we can't use it for
3155    templates.  */
3156 #define CP_DECL_THREAD_LOCAL_P(NODE) \
3157   (TREE_LANG_FLAG_0 (VAR_DECL_CHECK (NODE)))
3158
3159 /* The _TYPE context in which this _DECL appears.  This field holds the
3160    class where a virtual function instance is actually defined.  */
3161 #define DECL_CLASS_CONTEXT(NODE) \
3162   (DECL_CLASS_SCOPE_P (NODE) ? DECL_CONTEXT (NODE) : NULL_TREE)
3163
3164 /* For a non-member friend function, the class (if any) in which this
3165    friend was defined.  For example, given:
3166
3167      struct S { friend void f () { ... } };
3168
3169    the DECL_FRIEND_CONTEXT for `f' will be `S'.  */
3170 #define DECL_FRIEND_CONTEXT(NODE)                               \
3171   ((DECL_DECLARES_FUNCTION_P (NODE)                             \
3172     && DECL_FRIEND_P (NODE) && !DECL_FUNCTION_MEMBER_P (NODE))  \
3173    ? LANG_DECL_FN_CHECK (NODE)->context                         \
3174    : NULL_TREE)
3175
3176 /* Set the DECL_FRIEND_CONTEXT for NODE to CONTEXT.  */
3177 #define SET_DECL_FRIEND_CONTEXT(NODE, CONTEXT) \
3178   (LANG_DECL_FN_CHECK (NODE)->context = (CONTEXT))
3179
3180 #define CP_DECL_CONTEXT(NODE) \
3181   (!DECL_FILE_SCOPE_P (NODE) ? DECL_CONTEXT (NODE) : global_namespace)
3182 #define CP_TYPE_CONTEXT(NODE) \
3183   (!TYPE_FILE_SCOPE_P (NODE) ? TYPE_CONTEXT (NODE) : global_namespace)
3184 #define FROB_CONTEXT(NODE) \
3185   ((NODE) == global_namespace ? DECL_CONTEXT (NODE) : (NODE))
3186
3187 /* 1 iff NODE has namespace scope, including the global namespace.  */
3188 #define DECL_NAMESPACE_SCOPE_P(NODE)                            \
3189   (!DECL_TEMPLATE_PARM_P (NODE)                                 \
3190    && TREE_CODE (CP_DECL_CONTEXT (NODE)) == NAMESPACE_DECL)
3191
3192 #define TYPE_NAMESPACE_SCOPE_P(NODE) \
3193   (TREE_CODE (CP_TYPE_CONTEXT (NODE)) == NAMESPACE_DECL)
3194
3195 #define NAMESPACE_SCOPE_P(NODE) \
3196   ((DECL_P (NODE) && DECL_NAMESPACE_SCOPE_P (NODE)) \
3197    || (TYPE_P (NODE) && TYPE_NAMESPACE_SCOPE_P (NODE)))
3198
3199 /* 1 iff NODE is a class member.  */
3200 #define DECL_CLASS_SCOPE_P(NODE) \
3201   (DECL_CONTEXT (NODE) && TYPE_P (DECL_CONTEXT (NODE)))
3202
3203 #define TYPE_CLASS_SCOPE_P(NODE) \
3204   (TYPE_CONTEXT (NODE) && TYPE_P (TYPE_CONTEXT (NODE)))
3205
3206 /* 1 iff NODE is function-local.  */
3207 #define DECL_FUNCTION_SCOPE_P(NODE) \
3208   (DECL_CONTEXT (NODE) \
3209    && TREE_CODE (DECL_CONTEXT (NODE)) == FUNCTION_DECL)
3210
3211 #define TYPE_FUNCTION_SCOPE_P(NODE) \
3212   (TYPE_CONTEXT (NODE) && TREE_CODE (TYPE_CONTEXT (NODE)) == FUNCTION_DECL)
3213
3214 /* 1 iff VAR_DECL node NODE is a type-info decl.  This flag is set for
3215    both the primary typeinfo object and the associated NTBS name.  */
3216 #define DECL_TINFO_P(NODE) TREE_LANG_FLAG_4 (VAR_DECL_CHECK (NODE))
3217
3218 /* 1 iff VAR_DECL node NODE is virtual table or VTT.  */
3219 #define DECL_VTABLE_OR_VTT_P(NODE) TREE_LANG_FLAG_5 (VAR_DECL_CHECK (NODE))
3220
3221 /* 1 iff FUNCTION_TYPE or METHOD_TYPE has a ref-qualifier (either & or &&). */
3222 #define FUNCTION_REF_QUALIFIED(NODE) \
3223   TREE_LANG_FLAG_4 (FUNC_OR_METHOD_CHECK (NODE))
3224
3225 /* 1 iff FUNCTION_TYPE or METHOD_TYPE has &&-ref-qualifier.  */
3226 #define FUNCTION_RVALUE_QUALIFIED(NODE) \
3227   TREE_LANG_FLAG_5 (FUNC_OR_METHOD_CHECK (NODE))
3228
3229 /* Returns 1 iff VAR_DECL is a construction virtual table.
3230    DECL_VTABLE_OR_VTT_P will be true in this case and must be checked
3231    before using this macro.  */
3232 #define DECL_CONSTRUCTION_VTABLE_P(NODE) \
3233   TREE_LANG_FLAG_6 (VAR_DECL_CHECK (NODE))
3234
3235 /* 1 iff NODE is function-local, but for types.  */
3236 #define LOCAL_CLASS_P(NODE)                             \
3237   (decl_function_context (TYPE_MAIN_DECL (NODE)) != NULL_TREE)
3238
3239 /* The nesting depth of namespace, class or function.  Makes is_ancestor much
3240    simpler.  Only 8 bits available.  */
3241 #define SCOPE_DEPTH(NODE) \
3242   (NAMESPACE_DECL_CHECK (NODE)->base.u.bits.address_space)
3243
3244 /* Whether the namepace is an inline namespace.  */
3245 #define DECL_NAMESPACE_INLINE_P(NODE) \
3246   TREE_LANG_FLAG_0 (NAMESPACE_DECL_CHECK (NODE))
3247
3248 /* In a NAMESPACE_DECL, a vector of using directives.  */
3249 #define DECL_NAMESPACE_USING(NODE) \
3250    (LANG_DECL_NS_CHECK (NODE)->usings)
3251
3252 /* In a NAMESPACE_DECL, a vector of inline namespaces.  */
3253 #define DECL_NAMESPACE_INLINEES(NODE) \
3254    (LANG_DECL_NS_CHECK (NODE)->inlinees)
3255
3256 /* Pointer to hash_map from IDENTIFIERS to DECLS  */
3257 #define DECL_NAMESPACE_BINDINGS(NODE) \
3258    (LANG_DECL_NS_CHECK (NODE)->bindings)
3259
3260 /* In a NAMESPACE_DECL, points to the original namespace if this is
3261    a namespace alias.  */
3262 #define DECL_NAMESPACE_ALIAS(NODE) \
3263         DECL_ABSTRACT_ORIGIN (NAMESPACE_DECL_CHECK (NODE))
3264 #define ORIGINAL_NAMESPACE(NODE)  \
3265   (DECL_NAMESPACE_ALIAS (NODE) ? DECL_NAMESPACE_ALIAS (NODE) : (NODE))
3266
3267 /* Nonzero if NODE is the std namespace.  */
3268 #define DECL_NAMESPACE_STD_P(NODE)                      \
3269   (TREE_CODE (NODE) == NAMESPACE_DECL                   \
3270    && CP_DECL_CONTEXT (NODE) == global_namespace        \
3271    && DECL_NAME (NODE) == std_identifier)
3272
3273 /* In a TREE_LIST in an attribute list, indicates that the attribute
3274    must be applied at instantiation time.  */
3275 #define ATTR_IS_DEPENDENT(NODE) TREE_LANG_FLAG_0 (TREE_LIST_CHECK (NODE))
3276
3277 /* In a TREE_LIST in the argument of attribute abi_tag, indicates that the tag
3278    was inherited from a template parameter, not explicitly indicated.  */
3279 #define ABI_TAG_IMPLICIT(NODE) TREE_LANG_FLAG_0 (TREE_LIST_CHECK (NODE))
3280
3281 /* Non zero if this is a using decl for a dependent scope. */
3282 #define DECL_DEPENDENT_P(NODE) DECL_LANG_FLAG_0 (USING_DECL_CHECK (NODE))
3283
3284 /* The scope named in a using decl.  */
3285 #define USING_DECL_SCOPE(NODE) TREE_TYPE (USING_DECL_CHECK (NODE))
3286
3287 /* The decls named by a using decl.  */
3288 #define USING_DECL_DECLS(NODE) DECL_INITIAL (USING_DECL_CHECK (NODE))
3289
3290 /* Non zero if the using decl refers to a dependent type.  */
3291 #define USING_DECL_TYPENAME_P(NODE) DECL_LANG_FLAG_1 (USING_DECL_CHECK (NODE))
3292
3293 /* In a FUNCTION_DECL, this is nonzero if this function was defined in
3294    the class definition.  We have saved away the text of the function,
3295    but have not yet processed it.  */
3296 #define DECL_PENDING_INLINE_P(NODE) \
3297   (LANG_DECL_FN_CHECK (NODE)->pending_inline_p)
3298
3299 /* If DECL_PENDING_INLINE_P holds, this is the saved text of the
3300    function.  */
3301 #define DECL_PENDING_INLINE_INFO(NODE) \
3302   (LANG_DECL_FN_CHECK (NODE)->u.pending_inline_info)
3303
3304 /* Nonzero for TYPE_DECL means that it was written 'using name = type'.  */
3305 #define TYPE_DECL_ALIAS_P(NODE) \
3306   DECL_LANG_FLAG_6 (TYPE_DECL_CHECK (NODE))
3307
3308 /* Nonzero for TEMPLATE_DECL means that it is a 'complex' alias template.  */
3309 #define TEMPLATE_DECL_COMPLEX_ALIAS_P(NODE) \
3310   DECL_LANG_FLAG_2 (TEMPLATE_DECL_CHECK (NODE))
3311
3312 /* Nonzero for a type which is an alias for another type; i.e, a type
3313    which declaration was written 'using name-of-type =
3314    another-type'.  */
3315 #define TYPE_ALIAS_P(NODE)                      \
3316   (TYPE_P (NODE)                                \
3317    && TYPE_NAME (NODE)                          \
3318    && TREE_CODE (TYPE_NAME (NODE)) == TYPE_DECL \
3319    && TYPE_DECL_ALIAS_P (TYPE_NAME (NODE)))
3320
3321 /* If non-NULL for a VAR_DECL, FUNCTION_DECL, TYPE_DECL or
3322    TEMPLATE_DECL, the entity is either a template specialization (if
3323    DECL_USE_TEMPLATE is nonzero) or the abstract instance of the
3324    template itself.
3325
3326    In either case, DECL_TEMPLATE_INFO is a TEMPLATE_INFO, whose
3327    TI_TEMPLATE is the TEMPLATE_DECL of which this entity is a
3328    specialization or abstract instance.  The TI_ARGS is the
3329    template arguments used to specialize the template.
3330
3331    Consider:
3332
3333       template <typename T> struct S { friend void f(T) {} };
3334
3335    In this case, S<int>::f is, from the point of view of the compiler,
3336    an instantiation of a template -- but, from the point of view of
3337    the language, each instantiation of S results in a wholly unrelated
3338    global function f.  In this case, DECL_TEMPLATE_INFO for S<int>::f
3339    will be non-NULL, but DECL_USE_TEMPLATE will be zero.  */
3340 #define DECL_TEMPLATE_INFO(NODE) \
3341   (DECL_LANG_SPECIFIC (VAR_TEMPL_TYPE_FIELD_OR_FUNCTION_DECL_CHECK (NODE)) \
3342    ->u.min.template_info)
3343
3344 /* For a lambda capture proxy, its captured variable.  */
3345 #define DECL_CAPTURED_VARIABLE(NODE) \
3346   (LANG_DECL_MIN_CHECK (NODE)->access)
3347
3348 /* For a VAR_DECL, indicates that the variable is actually a
3349    non-static data member of anonymous union that has been promoted to
3350    variable status.  */
3351 #define DECL_ANON_UNION_VAR_P(NODE) \
3352   (DECL_LANG_FLAG_4 (VAR_DECL_CHECK (NODE)))
3353
3354 /* Template information for a RECORD_TYPE or UNION_TYPE.  */
3355 #define CLASSTYPE_TEMPLATE_INFO(NODE) \
3356   (TYPE_LANG_SLOT_1 (RECORD_OR_UNION_CHECK (NODE)))
3357
3358 /* Template information for a template template parameter.  */
3359 #define TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO(NODE) \
3360   (TYPE_LANG_SLOT_1 (BOUND_TEMPLATE_TEMPLATE_PARM_TYPE_CHECK (NODE)))
3361
3362 /* Template information for an ENUMERAL_, RECORD_, UNION_TYPE, or
3363    BOUND_TEMPLATE_TEMPLATE_PARM type.  This ignores any alias
3364    templateness of NODE.  It'd be nice if this could unconditionally
3365    access the slot, rather than return NULL if given a
3366    non-templatable type.  */
3367 #define TYPE_TEMPLATE_INFO(NODE)                                        \
3368   (TREE_CODE (NODE) == ENUMERAL_TYPE                                    \
3369    || TREE_CODE (NODE) == BOUND_TEMPLATE_TEMPLATE_PARM                  \
3370    || RECORD_OR_UNION_TYPE_P (NODE)                                     \
3371    ? TYPE_LANG_SLOT_1 (NODE) : NULL_TREE)
3372
3373 /* Template information (if any) for an alias type.  */
3374 #define TYPE_ALIAS_TEMPLATE_INFO(NODE)                                  \
3375   (DECL_LANG_SPECIFIC (TYPE_NAME (NODE))                                \
3376    ? DECL_TEMPLATE_INFO (TYPE_NAME (NODE))                              \
3377    : NULL_TREE)
3378
3379 /* If NODE is a type alias, this accessor returns the template info
3380    for the alias template (if any).  Otherwise behave as
3381    TYPE_TEMPLATE_INFO.  */
3382 #define TYPE_TEMPLATE_INFO_MAYBE_ALIAS(NODE)                            \
3383   (TYPE_ALIAS_P (NODE)                                                  \
3384    ? TYPE_ALIAS_TEMPLATE_INFO (NODE)                                    \
3385    : TYPE_TEMPLATE_INFO (NODE))
3386
3387 /* Set the template information for an ENUMERAL_, RECORD_, or
3388    UNION_TYPE to VAL.  */
3389 #define SET_TYPE_TEMPLATE_INFO(NODE, VAL)                               \
3390   (TREE_CODE (NODE) == ENUMERAL_TYPE                                    \
3391    || (CLASS_TYPE_P (NODE) && !TYPE_ALIAS_P (NODE))                     \
3392    ? (TYPE_LANG_SLOT_1 (NODE) = (VAL))                          \
3393    : (DECL_TEMPLATE_INFO (TYPE_NAME (NODE)) = (VAL)))
3394
3395 #define TI_TEMPLATE(NODE) TREE_TYPE (TEMPLATE_INFO_CHECK (NODE))
3396 #define TI_ARGS(NODE) TREE_CHAIN (TEMPLATE_INFO_CHECK (NODE))
3397 #define TI_PENDING_TEMPLATE_FLAG(NODE) \
3398   TREE_LANG_FLAG_1 (TEMPLATE_INFO_CHECK (NODE))
3399 /* For a given TREE_VEC containing a template argument list,
3400    this property contains the number of arguments that are not
3401    defaulted.  */
3402 #define NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) \
3403   TREE_CHAIN (TREE_VEC_CHECK (NODE))
3404
3405 /* Below are the setter and getter of the NON_DEFAULT_TEMPLATE_ARGS_COUNT
3406    property.  */
3407 #define SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE, INT_VALUE) \
3408   NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) = build_int_cst (NULL_TREE, INT_VALUE)
3409 #if CHECKING_P
3410 #define GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) \
3411     int_cst_value (NON_DEFAULT_TEMPLATE_ARGS_COUNT (NODE))
3412 #else
3413 #define GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) \
3414   NON_DEFAULT_TEMPLATE_ARGS_COUNT (NODE) \
3415   ? int_cst_value (NON_DEFAULT_TEMPLATE_ARGS_COUNT (NODE)) \
3416   : TREE_VEC_LENGTH (INNERMOST_TEMPLATE_ARGS (NODE))
3417 #endif
3418 /* The list of typedefs - used in the template - that need
3419    access checking at template instantiation time.
3420
3421    FIXME this should be associated with the TEMPLATE_DECL, not the
3422    TEMPLATE_INFO.  */
3423 #define TI_TYPEDEFS_NEEDING_ACCESS_CHECKING(NODE) \
3424   ((struct tree_template_info*)TEMPLATE_INFO_CHECK \
3425      (NODE))->typedefs_needing_access_checking
3426
3427 /* We use TREE_VECs to hold template arguments.  If there is only one
3428    level of template arguments, then the TREE_VEC contains the
3429    arguments directly.  If there is more than one level of template
3430    arguments, then each entry in the TREE_VEC is itself a TREE_VEC,
3431    containing the template arguments for a single level.  The first
3432    entry in the outer TREE_VEC is the outermost level of template
3433    parameters; the last is the innermost.
3434
3435    It is incorrect to ever form a template argument vector containing
3436    only one level of arguments, but which is a TREE_VEC containing as
3437    its only entry the TREE_VEC for that level.
3438
3439    For each TREE_VEC containing the template arguments for a single
3440    level, it's possible to get or set the number of non defaulted
3441    template arguments by using the accessor macros
3442    GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT or
3443    SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT.  */
3444
3445 /* Nonzero if the template arguments is actually a vector of vectors,
3446    rather than just a vector.  */
3447 #define TMPL_ARGS_HAVE_MULTIPLE_LEVELS(NODE)                 \
3448   (NODE && TREE_VEC_LENGTH (NODE) && TREE_VEC_ELT (NODE, 0)  \
3449    && TREE_CODE (TREE_VEC_ELT (NODE, 0)) == TREE_VEC)
3450
3451 /* The depth of a template argument vector.  When called directly by
3452    the parser, we use a TREE_LIST rather than a TREE_VEC to represent
3453    template arguments.  In fact, we may even see NULL_TREE if there
3454    are no template arguments.  In both of those cases, there is only
3455    one level of template arguments.  */
3456 #define TMPL_ARGS_DEPTH(NODE)                                   \
3457   (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (NODE) ? TREE_VEC_LENGTH (NODE) : 1)
3458
3459 /* The LEVELth level of the template ARGS.  The outermost level of
3460    args is level 1, not level 0.  */
3461 #define TMPL_ARGS_LEVEL(ARGS, LEVEL)            \
3462   (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (ARGS)        \
3463    ? TREE_VEC_ELT (ARGS, (LEVEL) - 1) : (ARGS))
3464
3465 /* Set the LEVELth level of the template ARGS to VAL.  This macro does
3466    not work with single-level argument vectors.  */
3467 #define SET_TMPL_ARGS_LEVEL(ARGS, LEVEL, VAL)   \
3468   (TREE_VEC_ELT (ARGS, (LEVEL) - 1) = (VAL))
3469
3470 /* Accesses the IDXth parameter in the LEVELth level of the ARGS.  */
3471 #define TMPL_ARG(ARGS, LEVEL, IDX)                              \
3472   (TREE_VEC_ELT (TMPL_ARGS_LEVEL (ARGS, LEVEL), IDX))
3473
3474 /* Given a single level of template arguments in NODE, return the
3475    number of arguments.  */
3476 #define NUM_TMPL_ARGS(NODE)                             \
3477   (TREE_VEC_LENGTH (NODE))
3478
3479 /* Returns the innermost level of template arguments in ARGS.  */
3480 #define INNERMOST_TEMPLATE_ARGS(NODE) \
3481   (get_innermost_template_args ((NODE), 1))
3482
3483 /* The number of levels of template parameters given by NODE.  */
3484 #define TMPL_PARMS_DEPTH(NODE) \
3485   ((HOST_WIDE_INT) TREE_INT_CST_LOW (TREE_PURPOSE (NODE)))
3486
3487 /* The TEMPLATE_DECL instantiated or specialized by NODE.  This
3488    TEMPLATE_DECL will be the immediate parent, not the most general
3489    template.  For example, in:
3490
3491       template <class T> struct S { template <class U> void f(U); }
3492
3493    the FUNCTION_DECL for S<int>::f<double> will have, as its
3494    DECL_TI_TEMPLATE, `template <class U> S<int>::f<U>'.
3495
3496    As a special case, for a member friend template of a template
3497    class, this value will not be a TEMPLATE_DECL, but rather an
3498    IDENTIFIER_NODE or OVERLOAD indicating the name of the template and
3499    any explicit template arguments provided.  For example, in:
3500
3501      template <class T> struct S { friend void f<int>(int, double); }
3502
3503    the DECL_TI_TEMPLATE will be an IDENTIFIER_NODE for `f' and the
3504    DECL_TI_ARGS will be {int}.
3505
3506    For a FIELD_DECL with a non-static data member initializer, this value
3507    is the FIELD_DECL it was instantiated from.  */
3508 #define DECL_TI_TEMPLATE(NODE)      TI_TEMPLATE (DECL_TEMPLATE_INFO (NODE))
3509
3510 /* The template arguments used to obtain this decl from the most
3511    general form of DECL_TI_TEMPLATE.  For the example given for
3512    DECL_TI_TEMPLATE, the DECL_TI_ARGS will be {int, double}.  These
3513    are always the full set of arguments required to instantiate this
3514    declaration from the most general template specialized here.  */
3515 #define DECL_TI_ARGS(NODE)          TI_ARGS (DECL_TEMPLATE_INFO (NODE))
3516
3517 /* The TEMPLATE_DECL associated with NODE, a class type.  Even if NODE
3518    will be generated from a partial specialization, the TEMPLATE_DECL
3519    referred to here will be the original template.  For example,
3520    given:
3521
3522       template <typename T> struct S {};
3523       template <typename T> struct S<T*> {};
3524
3525    the CLASSTPYE_TI_TEMPLATE for S<int*> will be S, not the S<T*>.  */
3526 #define CLASSTYPE_TI_TEMPLATE(NODE) TI_TEMPLATE (CLASSTYPE_TEMPLATE_INFO (NODE))
3527 #define CLASSTYPE_TI_ARGS(NODE)     TI_ARGS (CLASSTYPE_TEMPLATE_INFO (NODE))
3528
3529 /* For a template instantiation TYPE, returns the TYPE corresponding
3530    to the primary template.  Otherwise returns TYPE itself.  */
3531 #define CLASSTYPE_PRIMARY_TEMPLATE_TYPE(TYPE)                           \
3532   ((CLASSTYPE_USE_TEMPLATE ((TYPE))                                     \
3533     && !CLASSTYPE_TEMPLATE_SPECIALIZATION ((TYPE)))                     \
3534    ? TREE_TYPE (DECL_TEMPLATE_RESULT (DECL_PRIMARY_TEMPLATE             \
3535                                       (CLASSTYPE_TI_TEMPLATE ((TYPE))))) \
3536    : (TYPE))
3537
3538 /* Like CLASS_TI_TEMPLATE, but also works for ENUMERAL_TYPEs.  */
3539 #define TYPE_TI_TEMPLATE(NODE)                  \
3540   (TI_TEMPLATE (TYPE_TEMPLATE_INFO (NODE)))
3541
3542 /* Like DECL_TI_ARGS, but for an ENUMERAL_, RECORD_, or UNION_TYPE.  */
3543 #define TYPE_TI_ARGS(NODE)                      \
3544   (TI_ARGS (TYPE_TEMPLATE_INFO (NODE)))
3545
3546 #define INNERMOST_TEMPLATE_PARMS(NODE)  TREE_VALUE (NODE)
3547
3548 /* Nonzero if NODE (a TEMPLATE_DECL) is a member template, in the
3549    sense of [temp.mem].  */
3550 #define DECL_MEMBER_TEMPLATE_P(NODE) \
3551   (DECL_LANG_FLAG_1 (TEMPLATE_DECL_CHECK (NODE)))
3552
3553 /* Nonzero if the NODE corresponds to the template parameters for a
3554    member template, whose inline definition is being processed after
3555    the class definition is complete.  */
3556 #define TEMPLATE_PARMS_FOR_INLINE(NODE) TREE_LANG_FLAG_1 (NODE)
3557
3558 /* Determine if a declaration (PARM_DECL or FIELD_DECL) is a pack.  */
3559 #define DECL_PACK_P(NODE) \
3560   (DECL_P (NODE) && PACK_EXPANSION_P (TREE_TYPE (NODE)))
3561
3562 /* Determines if NODE is an expansion of one or more parameter packs,
3563    e.g., a TYPE_PACK_EXPANSION or EXPR_PACK_EXPANSION.  */
3564 #define PACK_EXPANSION_P(NODE)                 \
3565   (TREE_CODE (NODE) == TYPE_PACK_EXPANSION     \
3566    || TREE_CODE (NODE) == EXPR_PACK_EXPANSION)
3567
3568 /* Extracts the type or expression pattern from a TYPE_PACK_EXPANSION or
3569    EXPR_PACK_EXPANSION.  */
3570 #define PACK_EXPANSION_PATTERN(NODE)                            \
3571   (TREE_CODE (NODE) == TYPE_PACK_EXPANSION ? TREE_TYPE (NODE)    \
3572    : TREE_OPERAND (NODE, 0))
3573
3574 /* Sets the type or expression pattern for a TYPE_PACK_EXPANSION or
3575    EXPR_PACK_EXPANSION.  */
3576 #define SET_PACK_EXPANSION_PATTERN(NODE,VALUE)  \
3577   if (TREE_CODE (NODE) == TYPE_PACK_EXPANSION)  \
3578     TREE_TYPE (NODE) = VALUE;                   \
3579   else                                          \
3580     TREE_OPERAND (NODE, 0) = VALUE
3581
3582 /* The list of parameter packs used in the PACK_EXPANSION_* node. The
3583    TREE_VALUE of each TREE_LIST contains the parameter packs.  */
3584 #define PACK_EXPANSION_PARAMETER_PACKS(NODE)            \
3585   *(TREE_CODE (NODE) == EXPR_PACK_EXPANSION             \
3586     ? &TREE_OPERAND (NODE, 1)                           \
3587     : &TYPE_MIN_VALUE_RAW (TYPE_PACK_EXPANSION_CHECK (NODE)))
3588
3589 /* Any additional template args to be applied when substituting into
3590    the pattern, set by tsubst_pack_expansion for partial instantiations.
3591    If this is a TREE_LIST, the TREE_VALUE of the first element is the
3592    usual template argument TREE_VEC, and the TREE_PURPOSE of later elements
3593    are enclosing functions that provided function parameter packs we'll need
3594    to map appropriately.  */
3595 #define PACK_EXPANSION_EXTRA_ARGS(NODE)         \
3596   *(TREE_CODE (NODE) == TYPE_PACK_EXPANSION     \
3597     ? &TYPE_MAX_VALUE_RAW (NODE)                        \
3598     : &TREE_OPERAND ((NODE), 2))
3599
3600 /* True iff this pack expansion is within a function context.  */
3601 #define PACK_EXPANSION_LOCAL_P(NODE) TREE_LANG_FLAG_0 (NODE)
3602
3603 /* True iff this pack expansion is for sizeof....  */
3604 #define PACK_EXPANSION_SIZEOF_P(NODE) TREE_LANG_FLAG_1 (NODE)
3605
3606 /* True iff the wildcard can match a template parameter pack.  */
3607 #define WILDCARD_PACK_P(NODE) TREE_LANG_FLAG_0 (NODE)
3608
3609 /* Determine if this is an argument pack.  */
3610 #define ARGUMENT_PACK_P(NODE)                          \
3611   (TREE_CODE (NODE) == TYPE_ARGUMENT_PACK              \
3612    || TREE_CODE (NODE) == NONTYPE_ARGUMENT_PACK)
3613
3614 /* The arguments stored in an argument pack. Arguments are stored in a
3615    TREE_VEC, which may have length zero.  */
3616 #define ARGUMENT_PACK_ARGS(NODE)                               \
3617   (TREE_CODE (NODE) == TYPE_ARGUMENT_PACK? TREE_TYPE (NODE)    \
3618    : TREE_OPERAND (NODE, 0))
3619
3620 /* Set the arguments stored in an argument pack. VALUE must be a
3621    TREE_VEC.  */
3622 #define SET_ARGUMENT_PACK_ARGS(NODE,VALUE)     \
3623   if (TREE_CODE (NODE) == TYPE_ARGUMENT_PACK)  \
3624     TREE_TYPE (NODE) = VALUE;                           \
3625   else                                                  \
3626     TREE_OPERAND (NODE, 0) = VALUE
3627
3628 /* Whether the argument pack is "incomplete", meaning that more
3629    arguments can still be deduced. Incomplete argument packs are only
3630    used when the user has provided an explicit template argument list
3631    for a variadic function template. Some of the explicit template
3632    arguments will be placed into the beginning of the argument pack,
3633    but additional arguments might still be deduced.  */
3634 #define ARGUMENT_PACK_INCOMPLETE_P(NODE)        \
3635   TREE_ADDRESSABLE (ARGUMENT_PACK_ARGS (NODE))
3636
3637 /* When ARGUMENT_PACK_INCOMPLETE_P, stores the explicit template
3638    arguments used to fill this pack.  */
3639 #define ARGUMENT_PACK_EXPLICIT_ARGS(NODE)       \
3640   TREE_TYPE (ARGUMENT_PACK_ARGS (NODE))
3641
3642 /* In an ARGUMENT_PACK_SELECT, the argument pack from which an
3643    argument will be selected.  */
3644 #define ARGUMENT_PACK_SELECT_FROM_PACK(NODE)                            \
3645   (((struct tree_argument_pack_select *)ARGUMENT_PACK_SELECT_CHECK (NODE))->argument_pack)
3646
3647 /* In an ARGUMENT_PACK_SELECT, the index of the argument we want to
3648    select.  */
3649 #define ARGUMENT_PACK_SELECT_INDEX(NODE)                                \
3650   (((struct tree_argument_pack_select *)ARGUMENT_PACK_SELECT_CHECK (NODE))->index)
3651
3652 #define FOLD_EXPR_CHECK(NODE)                                           \
3653   TREE_CHECK4 (NODE, UNARY_LEFT_FOLD_EXPR, UNARY_RIGHT_FOLD_EXPR,       \
3654                BINARY_LEFT_FOLD_EXPR, BINARY_RIGHT_FOLD_EXPR)
3655
3656 #define BINARY_FOLD_EXPR_CHECK(NODE) \
3657   TREE_CHECK2 (NODE, BINARY_LEFT_FOLD_EXPR, BINARY_RIGHT_FOLD_EXPR)
3658
3659 /* True if NODE is UNARY_FOLD_EXPR or a BINARY_FOLD_EXPR */
3660 #define FOLD_EXPR_P(NODE)                               \
3661   (TREE_CODE (NODE) == UNARY_LEFT_FOLD_EXPR             \
3662    || TREE_CODE (NODE) == UNARY_RIGHT_FOLD_EXPR         \
3663    || TREE_CODE (NODE) == BINARY_LEFT_FOLD_EXPR         \
3664    || TREE_CODE (NODE) == BINARY_RIGHT_FOLD_EXPR)
3665
3666 /* True when NODE is a fold over a compound assignment operator. */
3667 #define FOLD_EXPR_MODIFY_P(NODE) \
3668   TREE_LANG_FLAG_0 (FOLD_EXPR_CHECK (NODE))
3669
3670 /* An INTEGER_CST containing the tree code of the folded operator. */
3671 #define FOLD_EXPR_OP(NODE) \
3672   TREE_OPERAND (FOLD_EXPR_CHECK (NODE), 0)
3673
3674 /* The expression containing an unexpanded parameter pack. */
3675 #define FOLD_EXPR_PACK(NODE) \
3676   TREE_OPERAND (FOLD_EXPR_CHECK (NODE), 1)
3677
3678 /* In a binary fold expression, the argument with no unexpanded
3679    parameter packs. */
3680 #define FOLD_EXPR_INIT(NODE) \
3681   TREE_OPERAND (BINARY_FOLD_EXPR_CHECK (NODE), 2)
3682
3683 /* In a FUNCTION_DECL, the saved language-specific per-function data.  */
3684 #define DECL_SAVED_FUNCTION_DATA(NODE)                  \
3685   (LANG_DECL_FN_CHECK (FUNCTION_DECL_CHECK (NODE))      \
3686    ->u.saved_language_function)
3687
3688 /* True if NODE is an implicit INDIRECT_REF from convert_from_reference.  */
3689 #define REFERENCE_REF_P(NODE)                           \
3690   (INDIRECT_REF_P (NODE)                                \
3691    && TREE_TYPE (TREE_OPERAND (NODE, 0))                \
3692    && TYPE_REF_P (TREE_TYPE (TREE_OPERAND ((NODE), 0))))
3693
3694 /* True if NODE is a REFERENCE_TYPE which is OK to instantiate to be a
3695    reference to VLA type, because it's used for VLA capture.  */
3696 #define REFERENCE_VLA_OK(NODE) \
3697   (TYPE_LANG_FLAG_5 (REFERENCE_TYPE_CHECK (NODE)))
3698
3699 #define NEW_EXPR_USE_GLOBAL(NODE) \
3700   TREE_LANG_FLAG_0 (NEW_EXPR_CHECK (NODE))
3701 #define DELETE_EXPR_USE_GLOBAL(NODE) \
3702   TREE_LANG_FLAG_0 (DELETE_EXPR_CHECK (NODE))
3703 #define DELETE_EXPR_USE_VEC(NODE) \
3704   TREE_LANG_FLAG_1 (DELETE_EXPR_CHECK (NODE))
3705
3706 #define CALL_OR_AGGR_INIT_CHECK(NODE) \
3707   TREE_CHECK2 ((NODE), CALL_EXPR, AGGR_INIT_EXPR)
3708
3709 /* Indicates that this is a non-dependent COMPOUND_EXPR which will
3710    resolve to a function call.  */
3711 #define COMPOUND_EXPR_OVERLOADED(NODE) \
3712   TREE_LANG_FLAG_0 (COMPOUND_EXPR_CHECK (NODE))
3713
3714 /* In a CALL_EXPR appearing in a template, true if Koenig lookup
3715    should be performed at instantiation time.  */
3716 #define KOENIG_LOOKUP_P(NODE) TREE_LANG_FLAG_0 (CALL_EXPR_CHECK (NODE))
3717
3718 /* True if the arguments to NODE should be evaluated in left-to-right
3719    order regardless of PUSH_ARGS_REVERSED.  */
3720 #define CALL_EXPR_ORDERED_ARGS(NODE) \
3721   TREE_LANG_FLAG_3 (CALL_OR_AGGR_INIT_CHECK (NODE))
3722
3723 /* True if the arguments to NODE should be evaluated in right-to-left
3724    order regardless of PUSH_ARGS_REVERSED.  */
3725 #define CALL_EXPR_REVERSE_ARGS(NODE) \
3726   TREE_LANG_FLAG_5 (CALL_OR_AGGR_INIT_CHECK (NODE))
3727
3728 /* True if CALL_EXPR was written as an operator expression, not a function
3729    call.  */
3730 #define CALL_EXPR_OPERATOR_SYNTAX(NODE) \
3731   TREE_LANG_FLAG_6 (CALL_OR_AGGR_INIT_CHECK (NODE))
3732
3733 /* Indicates whether a string literal has been parenthesized. Such
3734    usages are disallowed in certain circumstances.  */
3735
3736 #define PAREN_STRING_LITERAL_P(NODE) \
3737   TREE_LANG_FLAG_0 (STRING_CST_CHECK (NODE))
3738
3739 /* Indicates whether a COMPONENT_REF or a SCOPE_REF has been parenthesized, or
3740    an INDIRECT_REF comes from parenthesizing a _DECL.  Currently only set some
3741    of the time in C++14 mode.  */
3742
3743 #define REF_PARENTHESIZED_P(NODE) \
3744   TREE_LANG_FLAG_2 (TREE_CHECK4 ((NODE), COMPONENT_REF, INDIRECT_REF, SCOPE_REF, VIEW_CONVERT_EXPR))
3745
3746 /* Nonzero if this AGGR_INIT_EXPR provides for initialization via a
3747    constructor call, rather than an ordinary function call.  */
3748 #define AGGR_INIT_VIA_CTOR_P(NODE) \
3749   TREE_LANG_FLAG_0 (AGGR_INIT_EXPR_CHECK (NODE))
3750
3751 /* Nonzero if expanding this AGGR_INIT_EXPR should first zero-initialize
3752    the object.  */
3753 #define AGGR_INIT_ZERO_FIRST(NODE) \
3754   TREE_LANG_FLAG_2 (AGGR_INIT_EXPR_CHECK (NODE))
3755
3756 /* Nonzero means that the call is the jump from a thunk to the
3757    thunked-to function.  */
3758 #define AGGR_INIT_FROM_THUNK_P(NODE) \
3759   (AGGR_INIT_EXPR_CHECK (NODE)->base.protected_flag)
3760
3761 /* AGGR_INIT_EXPR accessors.  These are equivalent to the CALL_EXPR
3762    accessors, except for AGGR_INIT_EXPR_SLOT (which takes the place of
3763    CALL_EXPR_STATIC_CHAIN).  */
3764
3765 #define AGGR_INIT_EXPR_FN(NODE) TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), 1)
3766 #define AGGR_INIT_EXPR_SLOT(NODE) \
3767   TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), 2)
3768 #define AGGR_INIT_EXPR_ARG(NODE, I) \
3769   TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), (I) + 3)
3770 #define aggr_init_expr_nargs(NODE) (VL_EXP_OPERAND_LENGTH(NODE) - 3)
3771
3772 /* AGGR_INIT_EXPR_ARGP returns a pointer to the argument vector for NODE.
3773    We can't use &AGGR_INIT_EXPR_ARG (NODE, 0) because that will complain if
3774    the argument count is zero when checking is enabled.  Instead, do
3775    the pointer arithmetic to advance past the 3 fixed operands in a
3776    AGGR_INIT_EXPR.  That produces a valid pointer to just past the end of
3777    the operand array, even if it's not valid to dereference it.  */
3778 #define AGGR_INIT_EXPR_ARGP(NODE) \
3779   (&(TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), 0)) + 3)
3780
3781 /* Abstract iterators for AGGR_INIT_EXPRs.  */
3782
3783 /* Structure containing iterator state.  */
3784 struct aggr_init_expr_arg_iterator {
3785   tree t;       /* the aggr_init_expr */
3786   int n;        /* argument count */
3787   int i;        /* next argument index */
3788 };
3789
3790 /* Initialize the abstract argument list iterator object ITER with the
3791    arguments from AGGR_INIT_EXPR node EXP.  */
3792 inline void
3793 init_aggr_init_expr_arg_iterator (tree exp,
3794                                        aggr_init_expr_arg_iterator *iter)
3795 {
3796   iter->t = exp;
3797   iter->n = aggr_init_expr_nargs (exp);
3798   iter->i = 0;
3799 }
3800
3801 /* Return the next argument from abstract argument list iterator object ITER,
3802    and advance its state.  Return NULL_TREE if there are no more arguments.  */
3803 inline tree
3804 next_aggr_init_expr_arg (aggr_init_expr_arg_iterator *iter)
3805 {
3806   tree result;
3807   if (iter->i >= iter->n)
3808     return NULL_TREE;
3809   result = AGGR_INIT_EXPR_ARG (iter->t, iter->i);
3810   iter->i++;
3811   return result;
3812 }
3813
3814 /* Initialize the abstract argument list iterator object ITER, then advance
3815    past and return the first argument.  Useful in for expressions, e.g.
3816      for (arg = first_aggr_init_expr_arg (exp, &iter); arg;
3817           arg = next_aggr_init_expr_arg (&iter))   */
3818 inline tree
3819 first_aggr_init_expr_arg (tree exp, aggr_init_expr_arg_iterator *iter)
3820 {
3821   init_aggr_init_expr_arg_iterator (exp, iter);
3822   return next_aggr_init_expr_arg (iter);
3823 }
3824
3825 /* Test whether there are more arguments in abstract argument list iterator
3826    ITER, without changing its state.  */
3827 inline bool
3828 more_aggr_init_expr_args_p (const aggr_init_expr_arg_iterator *iter)
3829 {
3830   return (iter->i < iter->n);
3831 }
3832
3833 /* Iterate through each argument ARG of AGGR_INIT_EXPR CALL, using variable
3834    ITER (of type aggr_init_expr_arg_iterator) to hold the iteration state.  */
3835 #define FOR_EACH_AGGR_INIT_EXPR_ARG(arg, iter, call)                    \
3836   for ((arg) = first_aggr_init_expr_arg ((call), &(iter)); (arg);       \
3837        (arg) = next_aggr_init_expr_arg (&(iter)))
3838
3839 /* VEC_INIT_EXPR accessors.  */
3840 #define VEC_INIT_EXPR_SLOT(NODE) TREE_OPERAND (VEC_INIT_EXPR_CHECK (NODE), 0)
3841 #define VEC_INIT_EXPR_INIT(NODE) TREE_OPERAND (VEC_INIT_EXPR_CHECK (NODE), 1)
3842
3843 /* Indicates that a VEC_INIT_EXPR is a potential constant expression.
3844    Only set when the current function is constexpr.  */
3845 #define VEC_INIT_EXPR_IS_CONSTEXPR(NODE) \
3846   TREE_LANG_FLAG_0 (VEC_INIT_EXPR_CHECK (NODE))
3847
3848 /* Indicates that a VEC_INIT_EXPR is expressing value-initialization.  */
3849 #define VEC_INIT_EXPR_VALUE_INIT(NODE) \
3850   TREE_LANG_FLAG_1 (VEC_INIT_EXPR_CHECK (NODE))
3851
3852 /* The condition under which this MUST_NOT_THROW_EXPR actually blocks
3853    exceptions.  NULL_TREE means 'true'.  */
3854 #define MUST_NOT_THROW_COND(NODE) \
3855   TREE_OPERAND (MUST_NOT_THROW_EXPR_CHECK (NODE), 1)
3856
3857 /* The TYPE_MAIN_DECL for a class template type is a TYPE_DECL, not a
3858    TEMPLATE_DECL.  This macro determines whether or not a given class
3859    type is really a template type, as opposed to an instantiation or
3860    specialization of one.  */
3861 #define CLASSTYPE_IS_TEMPLATE(NODE)  \
3862   (CLASSTYPE_TEMPLATE_INFO (NODE)    \
3863    && !CLASSTYPE_USE_TEMPLATE (NODE) \
3864    && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (NODE)))
3865
3866 /* The name used by the user to name the typename type.  Typically,
3867    this is an IDENTIFIER_NODE, and the same as the DECL_NAME on the
3868    corresponding TYPE_DECL.  However, this may also be a
3869    TEMPLATE_ID_EXPR if we had something like `typename X::Y<T>'.  */
3870 #define TYPENAME_TYPE_FULLNAME(NODE) \
3871   (TYPE_VALUES_RAW (TYPENAME_TYPE_CHECK (NODE)))
3872
3873 /* True if a TYPENAME_TYPE was declared as an "enum".  */
3874 #define TYPENAME_IS_ENUM_P(NODE) \
3875   (TREE_LANG_FLAG_0 (TYPENAME_TYPE_CHECK (NODE)))
3876
3877 /* True if a TYPENAME_TYPE was declared as a "class", "struct", or
3878    "union".  */
3879 #define TYPENAME_IS_CLASS_P(NODE) \
3880   (TREE_LANG_FLAG_1 (TYPENAME_TYPE_CHECK (NODE)))
3881
3882 /* True if a TYPENAME_TYPE is in the process of being resolved.  */
3883 #define TYPENAME_IS_RESOLVING_P(NODE) \
3884   (TREE_LANG_FLAG_2 (TYPENAME_TYPE_CHECK (NODE)))
3885
3886 /* [class.virtual]
3887
3888    A class that declares or inherits a virtual function is called a
3889    polymorphic class.  */
3890 #define TYPE_POLYMORPHIC_P(NODE) (TREE_LANG_FLAG_2 (NODE))
3891
3892 /* Nonzero if this class has a virtual function table pointer.  */
3893 #define TYPE_CONTAINS_VPTR_P(NODE)              \
3894   (TYPE_POLYMORPHIC_P (NODE) || CLASSTYPE_VBASECLASSES (NODE))
3895
3896 /* Nonzero if NODE is a FUNCTION_DECL (for a function with global
3897    scope) declared in a local scope.  */
3898 #define DECL_LOCAL_FUNCTION_P(NODE) \
3899   DECL_LANG_FLAG_0 (FUNCTION_DECL_CHECK (NODE))
3900
3901 /* Nonzero if NODE is the target for genericization of 'break' stmts.  */
3902 #define LABEL_DECL_BREAK(NODE) \
3903   DECL_LANG_FLAG_0 (LABEL_DECL_CHECK (NODE))
3904
3905 /* Nonzero if NODE is the target for genericization of 'continue' stmts.  */
3906 #define LABEL_DECL_CONTINUE(NODE) \
3907   DECL_LANG_FLAG_1 (LABEL_DECL_CHECK (NODE))
3908
3909 /* Nonzero if NODE is the target for genericization of 'return' stmts
3910    in constructors/destructors of targetm.cxx.cdtor_returns_this targets.  */
3911 #define LABEL_DECL_CDTOR(NODE) \
3912   DECL_LANG_FLAG_2 (LABEL_DECL_CHECK (NODE))
3913
3914 /* True if NODE was declared with auto in its return type, but it has
3915    started compilation and so the return type might have been changed by
3916    return type deduction; its declared return type should be found in
3917    DECL_STRUCT_FUNCTION(NODE)->language->x_auto_return_pattern.  */
3918 #define FNDECL_USED_AUTO(NODE) \
3919   TREE_LANG_FLAG_2 (FUNCTION_DECL_CHECK (NODE))
3920
3921 /* Nonzero if NODE is a DECL which we know about but which has not
3922    been explicitly declared, such as a built-in function or a friend
3923    declared inside a class.  In the latter case DECL_HIDDEN_FRIEND_P
3924    will be set.  */
3925 #define DECL_ANTICIPATED(NODE) \
3926   (DECL_LANG_SPECIFIC (TYPE_FUNCTION_OR_TEMPLATE_DECL_CHECK (NODE)) \
3927    ->u.base.anticipated_p)
3928
3929 /* Is DECL NODE a hidden name?  */
3930 #define DECL_HIDDEN_P(NODE) \
3931   (DECL_LANG_SPECIFIC (NODE) && TYPE_FUNCTION_OR_TEMPLATE_DECL_P (NODE) \
3932    && DECL_ANTICIPATED (NODE))
3933
3934 /* True if this is a hidden class type.    */
3935 #define TYPE_HIDDEN_P(NODE) \
3936   (DECL_LANG_SPECIFIC (TYPE_NAME (NODE)) \
3937    && DECL_ANTICIPATED (TYPE_NAME (NODE)))
3938
3939 /* True for artificial decls added for OpenMP privatized non-static
3940    data members.  */
3941 #define DECL_OMP_PRIVATIZED_MEMBER(NODE) \
3942   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.anticipated_p)
3943
3944 /* Nonzero if NODE is a FUNCTION_DECL which was declared as a friend
3945    within a class but has not been declared in the surrounding scope.
3946    The function is invisible except via argument dependent lookup.  */
3947 #define DECL_HIDDEN_FRIEND_P(NODE) \
3948   (LANG_DECL_FN_CHECK (DECL_COMMON_CHECK (NODE))->hidden_friend_p)
3949
3950 /* Nonzero if NODE is an artificial FUNCTION_DECL for
3951    #pragma omp declare reduction.  */
3952 #define DECL_OMP_DECLARE_REDUCTION_P(NODE) \
3953   (LANG_DECL_FN_CHECK (DECL_COMMON_CHECK (NODE))->omp_declare_reduction_p)
3954
3955 /* Nonzero if DECL has been declared threadprivate by
3956    #pragma omp threadprivate.  */
3957 #define CP_DECL_THREADPRIVATE_P(DECL) \
3958   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (DECL))->u.base.threadprivate_or_deleted_p)
3959
3960 /* Nonzero if NODE is a VAR_DECL which has been declared inline.  */
3961 #define DECL_VAR_DECLARED_INLINE_P(NODE) \
3962   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))                   \
3963    ? DECL_LANG_SPECIFIC (NODE)->u.base.var_declared_inline_p    \
3964    : false)
3965 #define SET_DECL_VAR_DECLARED_INLINE_P(NODE) \
3966   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.var_declared_inline_p \
3967    = true)
3968
3969 /* True if NODE is a constant variable with a value-dependent initializer.  */
3970 #define DECL_DEPENDENT_INIT_P(NODE)                             \
3971   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))                   \
3972    && DECL_LANG_SPECIFIC (NODE)->u.base.dependent_init_p)
3973 #define SET_DECL_DEPENDENT_INIT_P(NODE, X) \
3974   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.dependent_init_p = (X))
3975
3976 /* Nonzero if NODE is an artificial VAR_DECL for a C++17 structured binding
3977    declaration or one of VAR_DECLs for the user identifiers in it.  */
3978 #define DECL_DECOMPOSITION_P(NODE) \
3979   (VAR_P (NODE) && DECL_LANG_SPECIFIC (NODE)                    \
3980    ? DECL_LANG_SPECIFIC (NODE)->u.base.selector == lds_decomp           \
3981    : false)
3982
3983 /* The underlying artificial VAR_DECL for structured binding.  */
3984 #define DECL_DECOMP_BASE(NODE) \
3985   (LANG_DECL_DECOMP_CHECK (NODE)->base)
3986
3987 /* Nonzero if NODE is an inline VAR_DECL.  In C++17, static data members
3988    declared with constexpr specifier are implicitly inline variables.  */
3989 #define DECL_INLINE_VAR_P(NODE) \
3990   (DECL_VAR_DECLARED_INLINE_P (NODE)                            \
3991    || (cxx_dialect >= cxx17                                     \
3992        && DECL_DECLARED_CONSTEXPR_P (NODE)                      \
3993        && DECL_CLASS_SCOPE_P (NODE)))
3994
3995 /* Nonzero if DECL was declared with '= delete'.  */
3996 #define DECL_DELETED_FN(DECL) \
3997   (LANG_DECL_FN_CHECK (DECL)->min.base.threadprivate_or_deleted_p)
3998
3999 /* Nonzero if DECL was declared with '= default' (maybe implicitly).  */
4000 #define DECL_DEFAULTED_FN(DECL) \
4001   (LANG_DECL_FN_CHECK (DECL)->defaulted_p)
4002
4003 /* Nonzero if DECL is explicitly defaulted in the class body.  */
4004 #define DECL_DEFAULTED_IN_CLASS_P(DECL)                                 \
4005   (DECL_DEFAULTED_FN (DECL) && DECL_INITIALIZED_IN_CLASS_P (DECL))
4006 /* Nonzero if DECL was defaulted outside the class body.  */
4007 #define DECL_DEFAULTED_OUTSIDE_CLASS_P(DECL)                            \
4008   (DECL_DEFAULTED_FN (DECL)                                             \
4009    && !(DECL_ARTIFICIAL (DECL) || DECL_INITIALIZED_IN_CLASS_P (DECL)))
4010
4011 /* Record whether a typedef for type `int' was actually `signed int'.  */
4012 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
4013
4014 /* Returns nonzero if DECL has external linkage, as specified by the
4015    language standard.  (This predicate may hold even when the
4016    corresponding entity is not actually given external linkage in the
4017    object file; see decl_linkage for details.)  */
4018 #define DECL_EXTERNAL_LINKAGE_P(DECL) \
4019   (decl_linkage (DECL) == lk_external)
4020
4021 /* Keep these codes in ascending code order.  */
4022
4023 #define INTEGRAL_CODE_P(CODE)   \
4024   ((CODE) == ENUMERAL_TYPE      \
4025    || (CODE) == BOOLEAN_TYPE    \
4026    || (CODE) == INTEGER_TYPE)
4027
4028 /* [basic.fundamental]
4029
4030    Types  bool, char, wchar_t, and the signed and unsigned integer types
4031    are collectively called integral types.
4032
4033    Note that INTEGRAL_TYPE_P, as defined in tree.h, allows enumeration
4034    types as well, which is incorrect in C++.  Keep these checks in
4035    ascending code order.  */
4036 #define CP_INTEGRAL_TYPE_P(TYPE)                \
4037   (TREE_CODE (TYPE) == BOOLEAN_TYPE             \
4038    || TREE_CODE (TYPE) == INTEGER_TYPE)
4039
4040 /* Returns true if TYPE is an integral or enumeration name.  Keep
4041    these checks in ascending code order.  */
4042 #define INTEGRAL_OR_ENUMERATION_TYPE_P(TYPE) \
4043    (TREE_CODE (TYPE) == ENUMERAL_TYPE || CP_INTEGRAL_TYPE_P (TYPE))
4044
4045 /* Returns true if TYPE is an integral or unscoped enumeration type.  */
4046 #define INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P(TYPE) \
4047    (UNSCOPED_ENUM_P (TYPE) || CP_INTEGRAL_TYPE_P (TYPE))
4048
4049 /* True if the class type TYPE is a literal type.  */
4050 #define CLASSTYPE_LITERAL_P(TYPE)              \
4051    (LANG_TYPE_CLASS_CHECK (TYPE)->is_literal)
4052
4053 /* [basic.fundamental]
4054
4055    Integral and floating types are collectively called arithmetic
4056    types.
4057
4058    As a GNU extension, we also accept complex types.
4059
4060    Keep these checks in ascending code order.  */
4061 #define ARITHMETIC_TYPE_P(TYPE) \
4062   (CP_INTEGRAL_TYPE_P (TYPE) \
4063    || TREE_CODE (TYPE) == REAL_TYPE \
4064    || TREE_CODE (TYPE) == COMPLEX_TYPE)
4065
4066 /* True iff TYPE is cv decltype(nullptr).  */
4067 #define NULLPTR_TYPE_P(TYPE) (TREE_CODE (TYPE) == NULLPTR_TYPE)
4068
4069 /* [basic.types]
4070
4071    Arithmetic types, enumeration types, pointer types,
4072    pointer-to-member types, and std::nullptr_t are collectively called
4073    scalar types.
4074
4075    Keep these checks in ascending code order.  */
4076 #define SCALAR_TYPE_P(TYPE)                     \
4077   (TYPE_PTRDATAMEM_P (TYPE)                     \
4078    || TREE_CODE (TYPE) == ENUMERAL_TYPE         \
4079    || ARITHMETIC_TYPE_P (TYPE)                  \
4080    || TYPE_PTR_P (TYPE)                         \
4081    || TYPE_PTRMEMFUNC_P (TYPE)                  \
4082    || NULLPTR_TYPE_P (TYPE))
4083
4084 /* Determines whether this type is a C++0x scoped enumeration
4085    type. Scoped enumerations types are introduced via "enum class" or
4086    "enum struct", e.g.,
4087
4088      enum class Color {
4089        Red, Green, Blue
4090      };
4091
4092    Scoped enumeration types are different from normal (unscoped)
4093    enumeration types in several ways:
4094
4095      - The enumerators of a scoped enumeration type are only available
4096        within the scope of the enumeration type and not in the
4097        enclosing scope. For example, the Red color can be referred to
4098        with "Color::Red" but not "Red".
4099
4100      - Scoped enumerators and enumerations do not implicitly convert
4101        to integers or 'bool'.
4102
4103      - The underlying type of the enum is well-defined.  */
4104 #define SCOPED_ENUM_P(TYPE)                                             \
4105   (TREE_CODE (TYPE) == ENUMERAL_TYPE && ENUM_IS_SCOPED (TYPE))
4106
4107 /* Determine whether this is an unscoped enumeration type.  */
4108 #define UNSCOPED_ENUM_P(TYPE)                                           \
4109   (TREE_CODE (TYPE) == ENUMERAL_TYPE && !ENUM_IS_SCOPED (TYPE))
4110
4111 /* Set the flag indicating whether an ENUMERAL_TYPE is a C++0x scoped
4112    enumeration type (1) or a normal (unscoped) enumeration type
4113    (0).  */
4114 #define SET_SCOPED_ENUM_P(TYPE, VAL)                    \
4115   (ENUM_IS_SCOPED (TYPE) = (VAL))
4116
4117 #define SET_OPAQUE_ENUM_P(TYPE, VAL)                    \
4118   (ENUM_IS_OPAQUE (TYPE) = (VAL))
4119
4120 #define OPAQUE_ENUM_P(TYPE)                             \
4121   (TREE_CODE (TYPE) == ENUMERAL_TYPE && ENUM_IS_OPAQUE (TYPE))
4122
4123 /* Determines whether an ENUMERAL_TYPE has an explicit
4124    underlying type.  */
4125 #define ENUM_FIXED_UNDERLYING_TYPE_P(NODE) (TYPE_LANG_FLAG_5 (NODE))
4126
4127 /* Returns the underlying type of the given enumeration type. The
4128    underlying type is determined in different ways, depending on the
4129    properties of the enum:
4130
4131      - In C++0x, the underlying type can be explicitly specified, e.g.,
4132
4133          enum E1 : char { ... } // underlying type is char
4134
4135      - In a C++0x scoped enumeration, the underlying type is int
4136        unless otherwises specified:
4137
4138          enum class E2 { ... } // underlying type is int
4139
4140      - Otherwise, the underlying type is determined based on the
4141        values of the enumerators. In this case, the
4142        ENUM_UNDERLYING_TYPE will not be set until after the definition
4143        of the enumeration is completed by finish_enum.  */
4144 #define ENUM_UNDERLYING_TYPE(TYPE) \
4145   TREE_TYPE (ENUMERAL_TYPE_CHECK (TYPE))
4146
4147 /* [dcl.init.aggr]
4148
4149    An aggregate is an array or a class with no user-provided
4150    constructors, no brace-or-equal-initializers for non-static data
4151    members, no private or protected non-static data members, no
4152    base classes, and no virtual functions.
4153
4154    As an extension, we also treat vectors as aggregates.  Keep these
4155    checks in ascending code order.  */
4156 #define CP_AGGREGATE_TYPE_P(TYPE)                               \
4157   (TREE_CODE (TYPE) == VECTOR_TYPE                              \
4158    ||TREE_CODE (TYPE) == ARRAY_TYPE                             \
4159    || (CLASS_TYPE_P (TYPE) && !CLASSTYPE_NON_AGGREGATE (TYPE)))
4160
4161 /* Nonzero for a class type means that the class type has a
4162    user-declared constructor.  */
4163 #define TYPE_HAS_USER_CONSTRUCTOR(NODE) (TYPE_LANG_FLAG_1 (NODE))
4164
4165 /* Nonzero means that the FUNCTION_TYPE or METHOD_TYPE has a
4166    late-specified return type.  */
4167 #define TYPE_HAS_LATE_RETURN_TYPE(NODE) \
4168   (TYPE_LANG_FLAG_2 (FUNC_OR_METHOD_CHECK (NODE)))
4169
4170 /* When appearing in an INDIRECT_REF, it means that the tree structure
4171    underneath is actually a call to a constructor.  This is needed
4172    when the constructor must initialize local storage (which can
4173    be automatically destroyed), rather than allowing it to allocate
4174    space from the heap.
4175
4176    When appearing in a SAVE_EXPR, it means that underneath
4177    is a call to a constructor.
4178
4179    When appearing in a CONSTRUCTOR, the expression is a
4180    compound literal.
4181
4182    When appearing in a FIELD_DECL, it means that this field
4183    has been duly initialized in its constructor.  */
4184 #define TREE_HAS_CONSTRUCTOR(NODE) (TREE_LANG_FLAG_4 (NODE))
4185
4186 /* True if NODE is a brace-enclosed initializer.  */
4187 #define BRACE_ENCLOSED_INITIALIZER_P(NODE) \
4188   (TREE_CODE (NODE) == CONSTRUCTOR && TREE_TYPE (NODE) == init_list_type_node)
4189
4190 /* True if NODE is a compound-literal, i.e., a brace-enclosed
4191    initializer cast to a particular type.  */
4192 #define COMPOUND_LITERAL_P(NODE) \
4193   (TREE_CODE (NODE) == CONSTRUCTOR && TREE_HAS_CONSTRUCTOR (NODE))
4194
4195 #define EMPTY_CONSTRUCTOR_P(NODE) (TREE_CODE (NODE) == CONSTRUCTOR \
4196                                    && vec_safe_is_empty(CONSTRUCTOR_ELTS(NODE))\
4197                                    && !TREE_HAS_CONSTRUCTOR (NODE))
4198
4199 /* True if NODE is a init-list used as a direct-initializer, i.e.
4200    B b{1,2}, not B b({1,2}) or B b = {1,2}.  */
4201 #define CONSTRUCTOR_IS_DIRECT_INIT(NODE) (TREE_LANG_FLAG_0 (CONSTRUCTOR_CHECK (NODE)))
4202
4203 /* True if this CONSTRUCTOR should not be used as a variable initializer
4204    because it was loaded from a constexpr variable with mutable fields.  */
4205 #define CONSTRUCTOR_MUTABLE_POISON(NODE) \
4206   (TREE_LANG_FLAG_2 (CONSTRUCTOR_CHECK (NODE)))
4207
4208 /* True if this typed CONSTRUCTOR represents C99 compound-literal syntax rather
4209    than C++11 functional cast syntax.  */
4210 #define CONSTRUCTOR_C99_COMPOUND_LITERAL(NODE) \
4211   (TREE_LANG_FLAG_3 (CONSTRUCTOR_CHECK (NODE)))
4212
4213 /* True if this CONSTRUCTOR contains PLACEHOLDER_EXPRs referencing the
4214    CONSTRUCTOR's type not nested inside another CONSTRUCTOR marked with
4215    CONSTRUCTOR_PLACEHOLDER_BOUNDARY.  */
4216 #define CONSTRUCTOR_PLACEHOLDER_BOUNDARY(NODE) \
4217   (TREE_LANG_FLAG_5 (CONSTRUCTOR_CHECK (NODE)))
4218
4219 #define DIRECT_LIST_INIT_P(NODE) \
4220    (BRACE_ENCLOSED_INITIALIZER_P (NODE) && CONSTRUCTOR_IS_DIRECT_INIT (NODE))
4221
4222 /* True if NODE represents a conversion for direct-initialization in a
4223    template.  Set by perform_implicit_conversion_flags.  */
4224 #define IMPLICIT_CONV_EXPR_DIRECT_INIT(NODE) \
4225   (TREE_LANG_FLAG_0 (IMPLICIT_CONV_EXPR_CHECK (NODE)))
4226
4227 /* True if NODE represents a dependent conversion of a non-type template
4228    argument.  Set by maybe_convert_nontype_argument.  */
4229 #define IMPLICIT_CONV_EXPR_NONTYPE_ARG(NODE) \
4230   (TREE_LANG_FLAG_1 (IMPLICIT_CONV_EXPR_CHECK (NODE)))
4231
4232 /* Nonzero means that an object of this type can not be initialized using
4233    an initializer list.  */
4234 #define CLASSTYPE_NON_AGGREGATE(NODE) \
4235   (LANG_TYPE_CLASS_CHECK (NODE)->non_aggregate)
4236 #define TYPE_NON_AGGREGATE_CLASS(NODE) \
4237   (CLASS_TYPE_P (NODE) && CLASSTYPE_NON_AGGREGATE (NODE))
4238
4239 /* Nonzero if there is a non-trivial X::op=(cv X&) for this class.  */
4240 #define TYPE_HAS_COMPLEX_COPY_ASSIGN(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_copy_assign)
4241
4242 /* Nonzero if there is a non-trivial X::X(cv X&) for this class.  */
4243 #define TYPE_HAS_COMPLEX_COPY_CTOR(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_copy_ctor)
4244
4245 /* Nonzero if there is a non-trivial X::op=(X&&) for this class.  */
4246 #define TYPE_HAS_COMPLEX_MOVE_ASSIGN(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_move_assign)
4247
4248 /* Nonzero if there is a non-trivial X::X(X&&) for this class.  */
4249 #define TYPE_HAS_COMPLEX_MOVE_CTOR(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_move_ctor)
4250
4251 /* Nonzero if there is no trivial default constructor for this class.  */
4252 #define TYPE_HAS_COMPLEX_DFLT(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_dflt)
4253
4254 /* Nonzero if TYPE has a trivial destructor.  From [class.dtor]:
4255
4256      A destructor is trivial if it is an implicitly declared
4257      destructor and if:
4258
4259        - all of the direct base classes of its class have trivial
4260          destructors,
4261
4262        - for all of the non-static data members of its class that are
4263          of class type (or array thereof), each such class has a
4264          trivial destructor.  */
4265 #define TYPE_HAS_TRIVIAL_DESTRUCTOR(NODE) \
4266   (!TYPE_HAS_NONTRIVIAL_DESTRUCTOR (NODE))
4267
4268 /* Nonzero for _TYPE node means that this type does not have a trivial
4269    destructor.  Therefore, destroying an object of this type will
4270    involve a call to a destructor.  This can apply to objects of
4271    ARRAY_TYPE is the type of the elements needs a destructor.  */
4272 #define TYPE_HAS_NONTRIVIAL_DESTRUCTOR(NODE) \
4273   (TYPE_LANG_FLAG_4 (NODE))
4274
4275 /* Nonzero for class type means that the default constructor is trivial.  */
4276 #define TYPE_HAS_TRIVIAL_DFLT(NODE) \
4277   (TYPE_HAS_DEFAULT_CONSTRUCTOR (NODE) && ! TYPE_HAS_COMPLEX_DFLT (NODE))
4278
4279 /* Nonzero for class type means that copy initialization of this type can use
4280    a bitwise copy.  */
4281 #define TYPE_HAS_TRIVIAL_COPY_CTOR(NODE) \
4282   (TYPE_HAS_COPY_CTOR (NODE) && ! TYPE_HAS_COMPLEX_COPY_CTOR (NODE))
4283
4284 /* Nonzero for class type means that assignment of this type can use
4285    a bitwise copy.  */
4286 #define TYPE_HAS_TRIVIAL_COPY_ASSIGN(NODE) \
4287   (TYPE_HAS_COPY_ASSIGN (NODE) && ! TYPE_HAS_COMPLEX_COPY_ASSIGN (NODE))
4288
4289 /* Returns true if NODE is a pointer-to-data-member.  */
4290 #define TYPE_PTRDATAMEM_P(NODE)                 \
4291   (TREE_CODE (NODE) == OFFSET_TYPE)
4292
4293 /* Returns true if NODE is a pointer.  */
4294 #define TYPE_PTR_P(NODE)                        \
4295   (TREE_CODE (NODE) == POINTER_TYPE)
4296
4297 /* Returns true if NODE is a reference.  */
4298 #define TYPE_REF_P(NODE)                        \
4299   (TREE_CODE (NODE) == REFERENCE_TYPE)
4300
4301 /* Returns true if NODE is a pointer or a reference.  */
4302 #define INDIRECT_TYPE_P(NODE)                   \
4303   (TYPE_PTR_P (NODE) || TYPE_REF_P (NODE))
4304
4305 /* Returns true if NODE is an object type:
4306
4307      [basic.types]
4308
4309      An object type is a (possibly cv-qualified) type that is not a
4310      function type, not a reference type, and not a void type.
4311
4312    Keep these checks in ascending order, for speed.  */
4313 #define TYPE_OBJ_P(NODE)                        \
4314   (!TYPE_REF_P (NODE)                           \
4315    && !VOID_TYPE_P (NODE)                       \
4316    && TREE_CODE (NODE) != FUNCTION_TYPE         \
4317    && TREE_CODE (NODE) != METHOD_TYPE)
4318
4319 /* Returns true if NODE is a pointer to an object.  Keep these checks
4320    in ascending tree code order.  */
4321 #define TYPE_PTROB_P(NODE)                                      \
4322   (TYPE_PTR_P (NODE) && TYPE_OBJ_P (TREE_TYPE (NODE)))
4323
4324 /* Returns true if NODE is a reference to an object.  Keep these checks
4325    in ascending tree code order.  */
4326 #define TYPE_REF_OBJ_P(NODE)                                    \
4327   (TYPE_REF_P (NODE) && TYPE_OBJ_P (TREE_TYPE (NODE)))
4328
4329 /* Returns true if NODE is a pointer to an object, or a pointer to
4330    void.  Keep these checks in ascending tree code order.  */
4331 #define TYPE_PTROBV_P(NODE)                                     \
4332   (TYPE_PTR_P (NODE)                                            \
4333    && !(TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE           \
4334         || TREE_CODE (TREE_TYPE (NODE)) == METHOD_TYPE))
4335
4336 /* Returns true if NODE is a pointer to function type.  */
4337 #define TYPE_PTRFN_P(NODE)                              \
4338   (TYPE_PTR_P (NODE)                                    \
4339    && TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE)
4340
4341 /* Returns true if NODE is a reference to function type.  */
4342 #define TYPE_REFFN_P(NODE)                              \
4343   (TYPE_REF_P (NODE)                                    \
4344    && TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE)
4345
4346 /* Returns true if NODE is a pointer to member function type.  */
4347 #define TYPE_PTRMEMFUNC_P(NODE)         \
4348   (TREE_CODE (NODE) == RECORD_TYPE      \
4349    && TYPE_PTRMEMFUNC_FLAG (NODE))
4350
4351 #define TYPE_PTRMEMFUNC_FLAG(NODE) \
4352   (TYPE_LANG_FLAG_2 (RECORD_TYPE_CHECK (NODE)))
4353
4354 /* Returns true if NODE is a pointer-to-member.  */
4355 #define TYPE_PTRMEM_P(NODE) \
4356   (TYPE_PTRDATAMEM_P (NODE) || TYPE_PTRMEMFUNC_P (NODE))
4357
4358 /* Returns true if NODE is a pointer or a pointer-to-member.  */
4359 #define TYPE_PTR_OR_PTRMEM_P(NODE) \
4360   (TYPE_PTR_P (NODE) || TYPE_PTRMEM_P (NODE))
4361
4362 /* Indicates when overload resolution may resolve to a pointer to
4363    member function. [expr.unary.op]/3 */
4364 #define PTRMEM_OK_P(NODE) \
4365   TREE_LANG_FLAG_0 (TREE_CHECK3 ((NODE), ADDR_EXPR, OFFSET_REF, SCOPE_REF))
4366
4367 /* Get the POINTER_TYPE to the METHOD_TYPE associated with this
4368    pointer to member function.  TYPE_PTRMEMFUNC_P _must_ be true,
4369    before using this macro.  */
4370 #define TYPE_PTRMEMFUNC_FN_TYPE(NODE) \
4371   (cp_build_qualified_type (TREE_TYPE (TYPE_FIELDS (NODE)),\
4372                             cp_type_quals (NODE)))
4373
4374 /* As above, but can be used in places that want an lvalue at the expense
4375    of not necessarily having the correct cv-qualifiers.  */
4376 #define TYPE_PTRMEMFUNC_FN_TYPE_RAW(NODE) \
4377   (TREE_TYPE (TYPE_FIELDS (NODE)))
4378
4379 /* Returns `A' for a type like `int (A::*)(double)' */
4380 #define TYPE_PTRMEMFUNC_OBJECT_TYPE(NODE) \
4381   TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (NODE)))
4382
4383 /* The canonical internal RECORD_TYPE from the POINTER_TYPE to
4384    METHOD_TYPE.  */
4385 #define TYPE_PTRMEMFUNC_TYPE(NODE) \
4386   TYPE_LANG_SLOT_1 (NODE)
4387
4388 /* For a pointer-to-member type of the form `T X::*', this is `X'.
4389    For a type like `void (X::*)() const', this type is `X', not `const
4390    X'.  To get at the `const X' you have to look at the
4391    TYPE_PTRMEM_POINTED_TO_TYPE; there, the first parameter will have
4392    type `const X*'.  */
4393 #define TYPE_PTRMEM_CLASS_TYPE(NODE)                    \
4394   (TYPE_PTRDATAMEM_P (NODE)                                     \
4395    ? TYPE_OFFSET_BASETYPE (NODE)                \
4396    : TYPE_PTRMEMFUNC_OBJECT_TYPE (NODE))
4397
4398 /* For a pointer-to-member type of the form `T X::*', this is `T'.  */
4399 #define TYPE_PTRMEM_POINTED_TO_TYPE(NODE)               \
4400    (TYPE_PTRDATAMEM_P (NODE)                            \
4401     ? TREE_TYPE (NODE)                                  \
4402     : TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (NODE)))
4403
4404 /* For a pointer-to-member constant `X::Y' this is the RECORD_TYPE for
4405    `X'.  */
4406 #define PTRMEM_CST_CLASS(NODE) \
4407   TYPE_PTRMEM_CLASS_TYPE (TREE_TYPE (PTRMEM_CST_CHECK (NODE)))
4408
4409 /* For a pointer-to-member constant `X::Y' this is the _DECL for
4410    `Y'.  */
4411 #define PTRMEM_CST_MEMBER(NODE) \
4412   (((ptrmem_cst_t)PTRMEM_CST_CHECK (NODE))->member)
4413
4414 /* The expression in question for a TYPEOF_TYPE.  */
4415 #define TYPEOF_TYPE_EXPR(NODE) (TYPE_VALUES_RAW (TYPEOF_TYPE_CHECK (NODE)))
4416
4417 /* The type in question for an UNDERLYING_TYPE.  */
4418 #define UNDERLYING_TYPE_TYPE(NODE) \
4419   (TYPE_VALUES_RAW (UNDERLYING_TYPE_CHECK (NODE)))
4420
4421 /* The type in question for BASES.  */
4422 #define BASES_TYPE(NODE) \
4423   (TYPE_VALUES_RAW (BASES_CHECK (NODE)))
4424
4425 #define BASES_DIRECT(NODE) \
4426   TREE_LANG_FLAG_0 (BASES_CHECK (NODE))
4427
4428 /* The expression in question for a DECLTYPE_TYPE.  */
4429 #define DECLTYPE_TYPE_EXPR(NODE) (TYPE_VALUES_RAW (DECLTYPE_TYPE_CHECK (NODE)))
4430
4431 /* Whether the DECLTYPE_TYPE_EXPR of NODE was originally parsed as an
4432    id-expression or a member-access expression. When false, it was
4433    parsed as a full expression.  */
4434 #define DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P(NODE) \
4435   (DECLTYPE_TYPE_CHECK (NODE))->type_common.string_flag
4436
4437 /* These flags indicate that we want different semantics from normal
4438    decltype: lambda capture just drops references, init capture
4439    uses auto semantics, lambda proxies look through implicit dereference.  */
4440 #define DECLTYPE_FOR_LAMBDA_CAPTURE(NODE) \
4441   TREE_LANG_FLAG_0 (DECLTYPE_TYPE_CHECK (NODE))
4442 #define DECLTYPE_FOR_INIT_CAPTURE(NODE) \
4443   TREE_LANG_FLAG_1 (DECLTYPE_TYPE_CHECK (NODE))
4444 #define DECLTYPE_FOR_LAMBDA_PROXY(NODE) \
4445   TREE_LANG_FLAG_2 (DECLTYPE_TYPE_CHECK (NODE))
4446 #define DECLTYPE_FOR_REF_CAPTURE(NODE) \
4447   TREE_LANG_FLAG_3 (DECLTYPE_TYPE_CHECK (NODE))
4448
4449 /* Nonzero for VAR_DECL and FUNCTION_DECL node means that `extern' was
4450    specified in its declaration.  This can also be set for an
4451    erroneously declared PARM_DECL.  */
4452 #define DECL_THIS_EXTERN(NODE) \
4453   DECL_LANG_FLAG_2 (VAR_FUNCTION_OR_PARM_DECL_CHECK (NODE))
4454
4455 /* Nonzero for VAR_DECL and FUNCTION_DECL node means that `static' was
4456    specified in its declaration.  This can also be set for an
4457    erroneously declared PARM_DECL.  */
4458 #define DECL_THIS_STATIC(NODE) \
4459   DECL_LANG_FLAG_6 (VAR_FUNCTION_OR_PARM_DECL_CHECK (NODE))
4460
4461 /* Nonzero for FIELD_DECL node means that this field is a lambda capture
4462    field for an array of runtime bound.  */
4463 #define DECL_VLA_CAPTURE_P(NODE) \
4464   DECL_LANG_FLAG_1 (FIELD_DECL_CHECK (NODE))
4465
4466 /* Nonzero for PARM_DECL node means that this is an array function
4467    parameter, i.e, a[] rather than *a.  */
4468 #define DECL_ARRAY_PARAMETER_P(NODE) \
4469   DECL_LANG_FLAG_1 (PARM_DECL_CHECK (NODE))
4470
4471 /* Nonzero for a FIELD_DECL who's NSMDI is currently being
4472    instantiated.  */
4473 #define DECL_INSTANTIATING_NSDMI_P(NODE) \
4474   DECL_LANG_FLAG_2 (FIELD_DECL_CHECK (NODE))
4475
4476 /* Nonzero for FIELD_DECL node means that this field is a base class
4477    of the parent object, as opposed to a member field.  */
4478 #define DECL_FIELD_IS_BASE(NODE) \
4479   DECL_LANG_FLAG_6 (FIELD_DECL_CHECK (NODE))
4480
4481 /* Nonzero for FIELD_DECL node means that this field is a simple (no
4482    explicit initializer) lambda capture field, making it invisible to
4483    name lookup in unevaluated contexts.  */
4484 #define DECL_NORMAL_CAPTURE_P(NODE) \
4485   DECL_LANG_FLAG_7 (FIELD_DECL_CHECK (NODE))
4486
4487 /* Nonzero if TYPE is an anonymous union or struct type.  We have to use a
4488    flag for this because "A union for which objects or pointers are
4489    declared is not an anonymous union" [class.union].  */
4490 #define ANON_AGGR_TYPE_P(NODE)                          \
4491   (CLASS_TYPE_P (NODE) && LANG_TYPE_CLASS_CHECK (NODE)->anon_aggr)
4492 #define SET_ANON_AGGR_TYPE_P(NODE)                      \
4493   (LANG_TYPE_CLASS_CHECK (NODE)->anon_aggr = 1)
4494
4495 /* Nonzero if TYPE is an anonymous union type.  */
4496 #define ANON_UNION_TYPE_P(NODE) \
4497   (TREE_CODE (NODE) == UNION_TYPE && ANON_AGGR_TYPE_P (NODE))
4498
4499 /* Define fields and accessors for nodes representing declared names.  */
4500
4501 /* Nonzero if TYPE is an unnamed class with a typedef for linkage purposes.  */
4502 #define TYPE_WAS_UNNAMED(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->was_anonymous)
4503
4504 /* C++: all of these are overloaded!  These apply only to TYPE_DECLs.  */
4505
4506 /* The format of each node in the DECL_FRIENDLIST is as follows:
4507
4508    The TREE_PURPOSE will be the name of a function, i.e., an
4509    IDENTIFIER_NODE.  The TREE_VALUE will be itself a TREE_LIST, whose
4510    TREE_VALUEs are friends with the given name.  */
4511 #define DECL_FRIENDLIST(NODE)           (DECL_INITIAL (NODE))
4512 #define FRIEND_NAME(LIST) (TREE_PURPOSE (LIST))
4513 #define FRIEND_DECLS(LIST) (TREE_VALUE (LIST))
4514
4515 /* The DECL_ACCESS, if non-NULL, is a TREE_LIST.  The TREE_PURPOSE of
4516    each node is a type; the TREE_VALUE is the access granted for this
4517    DECL in that type.  The DECL_ACCESS is set by access declarations.
4518    For example, if a member that would normally be public in a
4519    derived class is made protected, then the derived class and the
4520    protected_access_node will appear in the DECL_ACCESS for the node.  */
4521 #define DECL_ACCESS(NODE) (LANG_DECL_MIN_CHECK (NODE)->access)
4522
4523 /* Nonzero if the FUNCTION_DECL is a global constructor.  */
4524 #define DECL_GLOBAL_CTOR_P(NODE) \
4525   (LANG_DECL_FN_CHECK (NODE)->global_ctor_p)
4526
4527 /* Nonzero if the FUNCTION_DECL is a global destructor.  */
4528 #define DECL_GLOBAL_DTOR_P(NODE) \
4529   (LANG_DECL_FN_CHECK (NODE)->global_dtor_p)
4530
4531 /* Accessor macros for C++ template decl nodes.  */
4532
4533 /* The DECL_TEMPLATE_PARMS are a list.  The TREE_PURPOSE of each node
4534    is a INT_CST whose TREE_INT_CST_LOW indicates the level of the
4535    template parameters, with 1 being the outermost set of template
4536    parameters.  The TREE_VALUE is a vector, whose elements are the
4537    template parameters at each level.  Each element in the vector is a
4538    TREE_LIST, whose TREE_VALUE is a PARM_DECL (if the parameter is a
4539    non-type parameter), or a TYPE_DECL (if the parameter is a type
4540    parameter).  The TREE_PURPOSE is the default value, if any.  The
4541    TEMPLATE_PARM_INDEX for the parameter is available as the
4542    DECL_INITIAL (for a PARM_DECL) or as the TREE_TYPE (for a
4543    TYPE_DECL).
4544
4545    FIXME: CONST_CAST_TREE is a hack that hopefully will go away after
4546    tree is converted to C++ class hiearchy.  */
4547 #define DECL_TEMPLATE_PARMS(NODE)       \
4548    ((struct tree_template_decl *)CONST_CAST_TREE (TEMPLATE_DECL_CHECK (NODE)))->arguments
4549 #define DECL_INNERMOST_TEMPLATE_PARMS(NODE) \
4550    INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (NODE))
4551 #define DECL_NTPARMS(NODE) \
4552    TREE_VEC_LENGTH (DECL_INNERMOST_TEMPLATE_PARMS (NODE))
4553 /* For function, method, class-data templates.
4554
4555    FIXME: CONST_CAST_TREE is a hack that hopefully will go away after
4556    tree is converted to C++ class hiearchy.  */
4557 #define DECL_TEMPLATE_RESULT(NODE)      \
4558    ((struct tree_template_decl *)CONST_CAST_TREE(TEMPLATE_DECL_CHECK (NODE)))->result
4559 /* For a function template at namespace scope, DECL_TEMPLATE_INSTANTIATIONS
4560    lists all instantiations and specializations of the function so that
4561    tsubst_friend_function can reassign them to another template if we find
4562    that the namespace-scope template is really a partial instantiation of a
4563    friend template.
4564
4565    For a class template the DECL_TEMPLATE_INSTANTIATIONS lists holds
4566    all instantiations and specializations of the class type, including
4567    partial instantiations and partial specializations, so that if we
4568    explicitly specialize a partial instantiation we can walk the list
4569    in maybe_process_partial_specialization and reassign them or complain
4570    as appropriate.
4571
4572    In both cases, the TREE_PURPOSE of each node contains the arguments
4573    used; the TREE_VALUE contains the generated variable.  The template
4574    arguments are always complete.  For example, given:
4575
4576       template <class T> struct S1 {
4577         template <class U> struct S2 {};
4578         template <class U> struct S2<U*> {};
4579       };
4580
4581    the record for the partial specialization will contain, as its
4582    argument list, { {T}, {U*} }, and will be on the
4583    DECL_TEMPLATE_INSTANTIATIONS list for `template <class T> template
4584    <class U> struct S1<T>::S2'.
4585
4586    This list is not used for other templates.  */
4587 #define DECL_TEMPLATE_INSTANTIATIONS(NODE) \
4588   DECL_SIZE_UNIT (TEMPLATE_DECL_CHECK (NODE))
4589
4590 /* For a class template, this list contains the partial
4591    specializations of this template.  (Full specializations are not
4592    recorded on this list.)  The TREE_PURPOSE holds the arguments used
4593    in the partial specialization (e.g., for `template <class T> struct
4594    S<T*, int>' this will be `T*, int'.)  The arguments will also include
4595    any outer template arguments.  The TREE_VALUE holds the TEMPLATE_DECL
4596    for the partial specialization.  The TREE_TYPE is the _TYPE node for
4597    the partial specialization.
4598
4599    This list is not used for other templates.  */
4600 #define DECL_TEMPLATE_SPECIALIZATIONS(NODE)     \
4601   DECL_SIZE (TEMPLATE_DECL_CHECK (NODE))
4602
4603 /* Nonzero for a DECL which is actually a template parameter.  Keep
4604    these checks in ascending tree code order.   */
4605 #define DECL_TEMPLATE_PARM_P(NODE)              \
4606   (DECL_LANG_FLAG_0 (NODE)                      \
4607    && (TREE_CODE (NODE) == CONST_DECL           \
4608        || TREE_CODE (NODE) == PARM_DECL         \
4609        || TREE_CODE (NODE) == TYPE_DECL         \
4610        || TREE_CODE (NODE) == TEMPLATE_DECL))
4611
4612 /* Nonzero for a raw template parameter node.  */
4613 #define TEMPLATE_PARM_P(NODE)                                   \
4614   (TREE_CODE (NODE) == TEMPLATE_TYPE_PARM                       \
4615    || TREE_CODE (NODE) == TEMPLATE_TEMPLATE_PARM                \
4616    || TREE_CODE (NODE) == TEMPLATE_PARM_INDEX)
4617
4618 /* Mark NODE as a template parameter.  */
4619 #define SET_DECL_TEMPLATE_PARM_P(NODE) \
4620   (DECL_LANG_FLAG_0 (NODE) = 1)
4621
4622 /* Nonzero if NODE is a template template parameter.  */
4623 #define DECL_TEMPLATE_TEMPLATE_PARM_P(NODE) \
4624   (TREE_CODE (NODE) == TEMPLATE_DECL && DECL_TEMPLATE_PARM_P (NODE))
4625
4626 /* Nonzero for a DECL that represents a function template.  */
4627 #define DECL_FUNCTION_TEMPLATE_P(NODE)                          \
4628   (TREE_CODE (NODE) == TEMPLATE_DECL                            \
4629    && DECL_TEMPLATE_RESULT (NODE) != NULL_TREE                  \
4630    && TREE_CODE (DECL_TEMPLATE_RESULT (NODE)) == FUNCTION_DECL)
4631
4632 /* Nonzero for a DECL that represents a class template or alias
4633    template.  */
4634 #define DECL_TYPE_TEMPLATE_P(NODE)                              \
4635   (TREE_CODE (NODE) == TEMPLATE_DECL                            \
4636    && DECL_TEMPLATE_RESULT (NODE) != NULL_TREE                  \
4637    && TREE_CODE (DECL_TEMPLATE_RESULT (NODE)) == TYPE_DECL)
4638
4639 /* Nonzero for a DECL that represents a class template.  */
4640 #define DECL_CLASS_TEMPLATE_P(NODE)                             \
4641   (DECL_TYPE_TEMPLATE_P (NODE)                                  \
4642    && DECL_IMPLICIT_TYPEDEF_P (DECL_TEMPLATE_RESULT (NODE)))
4643
4644 /* Nonzero for a TEMPLATE_DECL that represents an alias template.  */
4645 #define DECL_ALIAS_TEMPLATE_P(NODE)                     \
4646   (DECL_TYPE_TEMPLATE_P (NODE)                          \
4647    && !DECL_ARTIFICIAL (DECL_TEMPLATE_RESULT (NODE)))
4648
4649 /* Nonzero for a NODE which declares a type.  */
4650 #define DECL_DECLARES_TYPE_P(NODE) \
4651   (TREE_CODE (NODE) == TYPE_DECL || DECL_TYPE_TEMPLATE_P (NODE))
4652
4653 /* Nonzero if NODE declares a function.  */
4654 #define DECL_DECLARES_FUNCTION_P(NODE) \
4655   (TREE_CODE (NODE) == FUNCTION_DECL || DECL_FUNCTION_TEMPLATE_P (NODE))
4656
4657 /* Nonzero if NODE is the typedef implicitly generated for a type when
4658    the type is declared.  In C++, `struct S {};' is roughly
4659    equivalent to `struct S {}; typedef struct S S;' in C.
4660    DECL_IMPLICIT_TYPEDEF_P will hold for the typedef indicated in this
4661    example.  In C++, there is a second implicit typedef for each
4662    class, called the injected-class-name, in the scope of `S' itself, so that
4663    you can say `S::S'.  DECL_SELF_REFERENCE_P will hold for that typedef.  */
4664 #define DECL_IMPLICIT_TYPEDEF_P(NODE) \
4665   (TREE_CODE (NODE) == TYPE_DECL && DECL_LANG_FLAG_2 (NODE))
4666 #define SET_DECL_IMPLICIT_TYPEDEF_P(NODE) \
4667   (DECL_LANG_FLAG_2 (NODE) = 1)
4668 #define DECL_SELF_REFERENCE_P(NODE) \
4669   (TREE_CODE (NODE) == TYPE_DECL && DECL_LANG_FLAG_4 (NODE))
4670 #define SET_DECL_SELF_REFERENCE_P(NODE) \
4671   (DECL_LANG_FLAG_4 (NODE) = 1)
4672
4673 /* A `primary' template is one that has its own template header and is not
4674    a partial specialization.  A member function of a class template is a
4675    template, but not primary.  A member template is primary.  Friend
4676    templates are primary, too.  */
4677
4678 /* Returns the primary template corresponding to these parameters.  */
4679 #define DECL_PRIMARY_TEMPLATE(NODE) \
4680   (TREE_TYPE (DECL_INNERMOST_TEMPLATE_PARMS (NODE)))
4681
4682 /* Returns nonzero if NODE is a primary template.  */
4683 #define PRIMARY_TEMPLATE_P(NODE) (DECL_PRIMARY_TEMPLATE (NODE) == (NODE))
4684
4685 /* Nonzero iff NODE is a specialization of a template.  The value
4686    indicates the type of specializations:
4687
4688      1=implicit instantiation
4689
4690      2=partial or explicit specialization, e.g.:
4691
4692         template <> int min<int> (int, int),
4693
4694      3=explicit instantiation, e.g.:
4695
4696         template int min<int> (int, int);
4697
4698    Note that NODE will be marked as a specialization even if the
4699    template it is instantiating is not a primary template.  For
4700    example, given:
4701
4702      template <typename T> struct O {
4703        void f();
4704        struct I {};
4705      };
4706
4707    both O<int>::f and O<int>::I will be marked as instantiations.
4708
4709    If DECL_USE_TEMPLATE is nonzero, then DECL_TEMPLATE_INFO will also
4710    be non-NULL.  */
4711 #define DECL_USE_TEMPLATE(NODE) (DECL_LANG_SPECIFIC (NODE)->u.base.use_template)
4712
4713 /* Like DECL_USE_TEMPLATE, but for class types.  */
4714 #define CLASSTYPE_USE_TEMPLATE(NODE) \
4715   (LANG_TYPE_CLASS_CHECK (NODE)->use_template)
4716
4717 /* True if NODE is a specialization of a primary template.  */
4718 #define CLASSTYPE_SPECIALIZATION_OF_PRIMARY_TEMPLATE_P(NODE)    \
4719   (CLASS_TYPE_P (NODE)                                          \
4720    && CLASSTYPE_USE_TEMPLATE (NODE)                             \
4721    && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (NODE)))
4722
4723 #define DECL_TEMPLATE_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) & 1)
4724 #define CLASSTYPE_TEMPLATE_INSTANTIATION(NODE) \
4725   (CLASSTYPE_USE_TEMPLATE (NODE) & 1)
4726
4727 #define DECL_TEMPLATE_SPECIALIZATION(NODE) (DECL_USE_TEMPLATE (NODE) == 2)
4728 #define SET_DECL_TEMPLATE_SPECIALIZATION(NODE) (DECL_USE_TEMPLATE (NODE) = 2)
4729
4730 /* Returns true for an explicit or partial specialization of a class
4731    template.  */
4732 #define CLASSTYPE_TEMPLATE_SPECIALIZATION(NODE) \
4733   (CLASSTYPE_USE_TEMPLATE (NODE) == 2)
4734 #define SET_CLASSTYPE_TEMPLATE_SPECIALIZATION(NODE) \
4735   (CLASSTYPE_USE_TEMPLATE (NODE) = 2)
4736
4737 #define DECL_IMPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) == 1)
4738 #define SET_DECL_IMPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) = 1)
4739 #define CLASSTYPE_IMPLICIT_INSTANTIATION(NODE) \
4740   (CLASSTYPE_USE_TEMPLATE (NODE) == 1)
4741 #define SET_CLASSTYPE_IMPLICIT_INSTANTIATION(NODE) \
4742   (CLASSTYPE_USE_TEMPLATE (NODE) = 1)
4743
4744 #define DECL_EXPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) == 3)
4745 #define SET_DECL_EXPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) = 3)
4746 #define CLASSTYPE_EXPLICIT_INSTANTIATION(NODE) \
4747   (CLASSTYPE_USE_TEMPLATE (NODE) == 3)
4748 #define SET_CLASSTYPE_EXPLICIT_INSTANTIATION(NODE) \
4749   (CLASSTYPE_USE_TEMPLATE (NODE) = 3)
4750
4751 /* Nonzero if DECL is a friend function which is an instantiation
4752    from the point of view of the compiler, but not from the point of
4753    view of the language.  For example given:
4754       template <class T> struct S { friend void f(T) {}; };
4755    the declaration of `void f(int)' generated when S<int> is
4756    instantiated will not be a DECL_TEMPLATE_INSTANTIATION, but will be
4757    a DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION.  */
4758 #define DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION(DECL) \
4759   (DECL_LANG_SPECIFIC (DECL) && DECL_TEMPLATE_INFO (DECL) \
4760    && !DECL_USE_TEMPLATE (DECL))
4761
4762 /* Nonzero if DECL is a function generated from a function 'temploid',
4763    i.e. template, member of class template, or dependent friend.  */
4764 #define DECL_TEMPLOID_INSTANTIATION(DECL)               \
4765   (DECL_TEMPLATE_INSTANTIATION (DECL)                   \
4766    || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (DECL))
4767
4768 /* Nonzero if DECL is either defined implicitly by the compiler or
4769    generated from a temploid.  */
4770 #define DECL_GENERATED_P(DECL) \
4771   (DECL_TEMPLOID_INSTANTIATION (DECL) || DECL_DEFAULTED_FN (DECL))
4772
4773 /* Nonzero iff we are currently processing a declaration for an
4774    entity with its own template parameter list, and which is not a
4775    full specialization.  */
4776 #define PROCESSING_REAL_TEMPLATE_DECL_P() \
4777   (!processing_template_parmlist \
4778    && processing_template_decl > template_class_depth (current_scope ()))
4779
4780 /* Nonzero if this VAR_DECL or FUNCTION_DECL has already been
4781    instantiated, i.e. its definition has been generated from the
4782    pattern given in the template.  */
4783 #define DECL_TEMPLATE_INSTANTIATED(NODE) \
4784   DECL_LANG_FLAG_1 (VAR_OR_FUNCTION_DECL_CHECK (NODE))
4785
4786 /* We know what we're doing with this decl now.  */
4787 #define DECL_INTERFACE_KNOWN(NODE) DECL_LANG_FLAG_5 (NODE)
4788
4789 /* DECL_EXTERNAL must be set on a decl until the decl is actually emitted,
4790    so that assemble_external will work properly.  So we have this flag to
4791    tell us whether the decl is really not external.
4792
4793    This flag does not indicate whether or not the decl is defined in the
4794    current translation unit; it indicates whether or not we should emit the
4795    decl at the end of compilation if it is defined and needed.  */
4796 #define DECL_NOT_REALLY_EXTERN(NODE) \
4797   (DECL_LANG_SPECIFIC (NODE)->u.base.not_really_extern)
4798
4799 #define DECL_REALLY_EXTERN(NODE) \
4800   (DECL_EXTERNAL (NODE)                         \
4801    && (!DECL_LANG_SPECIFIC (NODE) || !DECL_NOT_REALLY_EXTERN (NODE)))
4802
4803 /* A thunk is a stub function.
4804
4805    A thunk is an alternate entry point for an ordinary FUNCTION_DECL.
4806    The address of the ordinary FUNCTION_DECL is given by the
4807    DECL_INITIAL, which is always an ADDR_EXPR whose operand is a
4808    FUNCTION_DECL.  The job of the thunk is to either adjust the this
4809    pointer before transferring control to the FUNCTION_DECL, or call
4810    FUNCTION_DECL and then adjust the result value. Note, the result
4811    pointer adjusting thunk must perform a call to the thunked
4812    function, (or be implemented via passing some invisible parameter
4813    to the thunked function, which is modified to perform the
4814    adjustment just before returning).
4815
4816    A thunk may perform either, or both, of the following operations:
4817
4818    o Adjust the this or result pointer by a constant offset.
4819    o Adjust the this or result pointer by looking up a vcall or vbase offset
4820      in the vtable.
4821
4822    A this pointer adjusting thunk converts from a base to a derived
4823    class, and hence adds the offsets. A result pointer adjusting thunk
4824    converts from a derived class to a base, and hence subtracts the
4825    offsets.  If both operations are performed, then the constant
4826    adjustment is performed first for this pointer adjustment and last
4827    for the result pointer adjustment.
4828
4829    The constant adjustment is given by THUNK_FIXED_OFFSET.  If the
4830    vcall or vbase offset is required, THUNK_VIRTUAL_OFFSET is
4831    used. For this pointer adjusting thunks, it is the vcall offset
4832    into the vtable.  For result pointer adjusting thunks it is the
4833    binfo of the virtual base to convert to.  Use that binfo's vbase
4834    offset.
4835
4836    It is possible to have equivalent covariant thunks.  These are
4837    distinct virtual covariant thunks whose vbase offsets happen to
4838    have the same value.  THUNK_ALIAS is used to pick one as the
4839    canonical thunk, which will get all the this pointer adjusting
4840    thunks attached to it.  */
4841
4842 /* An integer indicating how many bytes should be subtracted from the
4843    this or result pointer when this function is called.  */
4844 #define THUNK_FIXED_OFFSET(DECL) \
4845   (DECL_LANG_SPECIFIC (THUNK_FUNCTION_CHECK (DECL))->u.fn.u5.fixed_offset)
4846
4847 /* A tree indicating how to perform the virtual adjustment. For a this
4848    adjusting thunk it is the number of bytes to be added to the vtable
4849    to find the vcall offset. For a result adjusting thunk, it is the
4850    binfo of the relevant virtual base.  If NULL, then there is no
4851    virtual adjust.  (The vptr is always located at offset zero from
4852    the this or result pointer.)  (If the covariant type is within the
4853    class hierarchy being laid out, the vbase index is not yet known
4854    at the point we need to create the thunks, hence the need to use
4855    binfos.)  */
4856
4857 #define THUNK_VIRTUAL_OFFSET(DECL) \
4858   (LANG_DECL_MIN_CHECK (FUNCTION_DECL_CHECK (DECL))->access)
4859
4860 /* A thunk which is equivalent to another thunk.  */
4861 #define THUNK_ALIAS(DECL) \
4862   (DECL_LANG_SPECIFIC (FUNCTION_DECL_CHECK (DECL))->u.min.template_info)
4863
4864 /* For thunk NODE, this is the FUNCTION_DECL thunked to.  It is
4865    possible for the target to be a thunk too.  */
4866 #define THUNK_TARGET(NODE)                              \
4867   (LANG_DECL_FN_CHECK (NODE)->befriending_classes)
4868
4869 /* True for a SCOPE_REF iff the "template" keyword was used to
4870    indicate that the qualified name denotes a template.  */
4871 #define QUALIFIED_NAME_IS_TEMPLATE(NODE) \
4872   (TREE_LANG_FLAG_1 (SCOPE_REF_CHECK (NODE)))
4873
4874 /* True for an OMP_ATOMIC that has dependent parameters.  These are stored
4875    as an expr in operand 1, and integer_zero_node or clauses in operand 0.  */
4876 #define OMP_ATOMIC_DEPENDENT_P(NODE) \
4877   (TREE_CODE (TREE_OPERAND (OMP_ATOMIC_CHECK (NODE), 0)) == INTEGER_CST \
4878    || TREE_CODE (TREE_OPERAND (OMP_ATOMIC_CHECK (NODE), 0)) == OMP_CLAUSE)
4879
4880 /* Used while gimplifying continue statements bound to OMP_FOR nodes.  */
4881 #define OMP_FOR_GIMPLIFYING_P(NODE) \
4882   (TREE_LANG_FLAG_0 (OMP_LOOP_CHECK (NODE)))
4883
4884 /* A language-specific token attached to the OpenMP data clauses to
4885    hold code (or code fragments) related to ctors, dtors, and op=.
4886    See semantics.c for details.  */
4887 #define CP_OMP_CLAUSE_INFO(NODE) \
4888   TREE_TYPE (OMP_CLAUSE_RANGE_CHECK (NODE, OMP_CLAUSE_PRIVATE, \
4889                                      OMP_CLAUSE_LINEAR))
4890
4891 /* Nonzero if this transaction expression's body contains statements.  */
4892 #define TRANSACTION_EXPR_IS_STMT(NODE) \
4893    TREE_LANG_FLAG_0 (TRANSACTION_EXPR_CHECK (NODE))
4894
4895 /* These macros provide convenient access to the various _STMT nodes
4896    created when parsing template declarations.  */
4897 #define TRY_STMTS(NODE)         TREE_OPERAND (TRY_BLOCK_CHECK (NODE), 0)
4898 #define TRY_HANDLERS(NODE)      TREE_OPERAND (TRY_BLOCK_CHECK (NODE), 1)
4899
4900 #define EH_SPEC_STMTS(NODE)     TREE_OPERAND (EH_SPEC_BLOCK_CHECK (NODE), 0)
4901 #define EH_SPEC_RAISES(NODE)    TREE_OPERAND (EH_SPEC_BLOCK_CHECK (NODE), 1)
4902
4903 #define USING_STMT_NAMESPACE(NODE) TREE_OPERAND (USING_STMT_CHECK (NODE), 0)
4904
4905 /* Nonzero if this try block is a function try block.  */
4906 #define FN_TRY_BLOCK_P(NODE)    TREE_LANG_FLAG_3 (TRY_BLOCK_CHECK (NODE))
4907 #define HANDLER_PARMS(NODE)     TREE_OPERAND (HANDLER_CHECK (NODE), 0)
4908 #define HANDLER_BODY(NODE)      TREE_OPERAND (HANDLER_CHECK (NODE), 1)
4909 #define HANDLER_TYPE(NODE)      TREE_TYPE (HANDLER_CHECK (NODE))
4910
4911 /* CLEANUP_STMT accessors.  The statement(s) covered, the cleanup to run
4912    and the VAR_DECL for which this cleanup exists.  */
4913 #define CLEANUP_BODY(NODE)      TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
4914 #define CLEANUP_EXPR(NODE)      TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
4915 #define CLEANUP_DECL(NODE)      TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 2)
4916
4917 /* IF_STMT accessors. These give access to the condition of the if
4918    statement, the then block of the if statement, and the else block
4919    of the if statement if it exists.  */
4920 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
4921 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
4922 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
4923 #define IF_SCOPE(NODE)          TREE_OPERAND (IF_STMT_CHECK (NODE), 3)
4924 #define IF_STMT_CONSTEXPR_P(NODE) TREE_LANG_FLAG_0 (IF_STMT_CHECK (NODE))
4925
4926 /* Like PACK_EXPANSION_EXTRA_ARGS, for constexpr if.  IF_SCOPE is used while
4927    building an IF_STMT; IF_STMT_EXTRA_ARGS is used after it is complete.  */
4928 #define IF_STMT_EXTRA_ARGS(NODE) IF_SCOPE (NODE)
4929
4930 /* WHILE_STMT accessors. These give access to the condition of the
4931    while statement and the body of the while statement, respectively.  */
4932 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
4933 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
4934
4935 /* DO_STMT accessors. These give access to the condition of the do
4936    statement and the body of the do statement, respectively.  */
4937 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
4938 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
4939
4940 /* FOR_STMT accessors. These give access to the init statement,
4941    condition, update expression, and body of the for statement,
4942    respectively.  */
4943 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
4944 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
4945 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
4946 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
4947 #define FOR_SCOPE(NODE)         TREE_OPERAND (FOR_STMT_CHECK (NODE), 4)
4948
4949 /* RANGE_FOR_STMT accessors. These give access to the declarator,
4950    expression, body, and scope of the statement, respectively.  */
4951 #define RANGE_FOR_DECL(NODE)    TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 0)
4952 #define RANGE_FOR_EXPR(NODE)    TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 1)
4953 #define RANGE_FOR_BODY(NODE)    TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 2)
4954 #define RANGE_FOR_SCOPE(NODE)   TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 3)
4955 #define RANGE_FOR_UNROLL(NODE)  TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 4)
4956 #define RANGE_FOR_INIT_STMT(NODE) TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 5)
4957 #define RANGE_FOR_IVDEP(NODE)   TREE_LANG_FLAG_6 (RANGE_FOR_STMT_CHECK (NODE))
4958
4959 #define SWITCH_STMT_COND(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
4960 #define SWITCH_STMT_BODY(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
4961 #define SWITCH_STMT_TYPE(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
4962 #define SWITCH_STMT_SCOPE(NODE) TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 3)
4963 /* True if there are case labels for all possible values of switch cond, either
4964    because there is a default: case label or because the case label ranges cover
4965    all values.  */
4966 #define SWITCH_STMT_ALL_CASES_P(NODE) \
4967   TREE_LANG_FLAG_0 (SWITCH_STMT_CHECK (NODE))
4968 /* True if the body of a switch stmt contains no BREAK_STMTs.  */
4969 #define SWITCH_STMT_NO_BREAK_P(NODE) \
4970   TREE_LANG_FLAG_2 (SWITCH_STMT_CHECK (NODE))
4971
4972 /* STMT_EXPR accessor.  */
4973 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
4974
4975 /* EXPR_STMT accessor. This gives the expression associated with an
4976    expression statement.  */
4977 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
4978
4979 /* True if this TARGET_EXPR was created by build_cplus_new, and so we can
4980    discard it if it isn't useful.  */
4981 #define TARGET_EXPR_IMPLICIT_P(NODE) \
4982   TREE_LANG_FLAG_0 (TARGET_EXPR_CHECK (NODE))
4983
4984 /* True if this TARGET_EXPR is the result of list-initialization of a
4985    temporary.  */
4986 #define TARGET_EXPR_LIST_INIT_P(NODE) \
4987   TREE_LANG_FLAG_1 (TARGET_EXPR_CHECK (NODE))
4988
4989 /* True if this TARGET_EXPR expresses direct-initialization of an object
4990    to be named later.  */
4991 #define TARGET_EXPR_DIRECT_INIT_P(NODE) \
4992   TREE_LANG_FLAG_2 (TARGET_EXPR_CHECK (NODE))
4993
4994 /* True if NODE is a TARGET_EXPR that just expresses a copy of its INITIAL; if
4995    the initializer has void type, it's doing something more complicated.  */
4996 #define SIMPLE_TARGET_EXPR_P(NODE)                              \
4997   (TREE_CODE (NODE) == TARGET_EXPR                              \
4998    && !VOID_TYPE_P (TREE_TYPE (TARGET_EXPR_INITIAL (NODE))))
4999
5000 /* True if EXPR expresses direct-initialization of a TYPE.  */
5001 #define DIRECT_INIT_EXPR_P(TYPE,EXPR)                                   \
5002   (TREE_CODE (EXPR) == TARGET_EXPR && TREE_LANG_FLAG_2 (EXPR)           \
5003    && same_type_ignoring_top_level_qualifiers_p (TYPE, TREE_TYPE (EXPR)))
5004
5005 /* True if this CONVERT_EXPR is for a conversion to virtual base in
5006    an NSDMI, and should be re-evaluated when used in a constructor.  */
5007 #define CONVERT_EXPR_VBASE_PATH(NODE) \
5008   TREE_LANG_FLAG_0 (CONVERT_EXPR_CHECK (NODE))
5009
5010 /* True if SIZEOF_EXPR argument is type.  */
5011 #define SIZEOF_EXPR_TYPE_P(NODE) \
5012   TREE_LANG_FLAG_0 (SIZEOF_EXPR_CHECK (NODE))
5013
5014 /* True if the ALIGNOF_EXPR was spelled "alignof".  */
5015 #define ALIGNOF_EXPR_STD_P(NODE) \
5016   TREE_LANG_FLAG_0 (ALIGNOF_EXPR_CHECK (NODE))
5017
5018 /* OMP_DEPOBJ accessors. These give access to the depobj expression of the
5019    #pragma omp depobj directive and the clauses, respectively.  If
5020    OMP_DEPOBJ_CLAUSES is INTEGER_CST, it is instead the update clause kind
5021    or OMP_CLAUSE_DEPEND_LAST for destroy clause.  */
5022 #define OMP_DEPOBJ_DEPOBJ(NODE)  TREE_OPERAND (OMP_DEPOBJ_CHECK (NODE), 0)
5023 #define OMP_DEPOBJ_CLAUSES(NODE) TREE_OPERAND (OMP_DEPOBJ_CHECK (NODE), 1)
5024
5025 /* An enumeration of the kind of tags that C++ accepts.  */
5026 enum tag_types {
5027   none_type = 0, /* Not a tag type.  */
5028   record_type,   /* "struct" types.  */
5029   class_type,    /* "class" types.  */
5030   union_type,    /* "union" types.  */
5031   enum_type,     /* "enum" types.  */
5032   typename_type, /* "typename" types.  */
5033   scope_type     /* namespace or tagged type name followed by :: */
5034 };
5035
5036 /* The various kinds of lvalues we distinguish.  */
5037 enum cp_lvalue_kind_flags {
5038   clk_none = 0,     /* Things that are not an lvalue.  */
5039   clk_ordinary = 1, /* An ordinary lvalue.  */
5040   clk_rvalueref = 2,/* An xvalue (rvalue formed using an rvalue reference) */
5041   clk_class = 4,    /* A prvalue of class or array type.  */
5042   clk_bitfield = 8, /* An lvalue for a bit-field.  */
5043   clk_packed = 16   /* An lvalue for a packed field.  */
5044 };
5045
5046 /* This type is used for parameters and variables which hold
5047    combinations of the flags in enum cp_lvalue_kind_flags.  */
5048 typedef int cp_lvalue_kind;
5049
5050 /* Various kinds of template specialization, instantiation, etc.  */
5051 enum tmpl_spec_kind {
5052   tsk_none,                /* Not a template at all.  */
5053   tsk_invalid_member_spec, /* An explicit member template
5054                               specialization, but the enclosing
5055                               classes have not all been explicitly
5056                               specialized.  */
5057   tsk_invalid_expl_inst,   /* An explicit instantiation containing
5058                               template parameter lists.  */
5059   tsk_excessive_parms,     /* A template declaration with too many
5060                               template parameter lists.  */
5061   tsk_insufficient_parms,  /* A template declaration with too few
5062                               parameter lists.  */
5063   tsk_template,            /* A template declaration.  */
5064   tsk_expl_spec,           /* An explicit specialization.  */
5065   tsk_expl_inst            /* An explicit instantiation.  */
5066 };
5067
5068 /* The various kinds of access.  BINFO_ACCESS depends on these being
5069    two bit quantities.  The numerical values are important; they are
5070    used to initialize RTTI data structures, so changing them changes
5071    the ABI.  */
5072 enum access_kind {
5073   ak_none = 0,             /* Inaccessible.  */
5074   ak_public = 1,           /* Accessible, as a `public' thing.  */
5075   ak_protected = 2,        /* Accessible, as a `protected' thing.  */
5076   ak_private = 3           /* Accessible, as a `private' thing.  */
5077 };
5078
5079 /* The various kinds of special functions.  If you add to this list,
5080    you should update special_function_p as well.  */
5081 enum special_function_kind {
5082   sfk_none = 0,            /* Not a special function.  This enumeral
5083                               must have value zero; see
5084                               special_function_p.  */
5085   /* The following are ordered, for use by member synthesis fns.  */
5086   sfk_destructor,          /* A destructor.  */
5087   sfk_constructor,         /* A constructor.  */
5088   sfk_inheriting_constructor, /* An inheriting constructor */
5089   sfk_copy_constructor,    /* A copy constructor.  */
5090   sfk_move_constructor,    /* A move constructor.  */
5091   sfk_copy_assignment,     /* A copy assignment operator.  */
5092   sfk_move_assignment,     /* A move assignment operator.  */
5093   /* The following are unordered.  */
5094   sfk_complete_destructor, /* A destructor for complete objects.  */
5095   sfk_base_destructor,     /* A destructor for base subobjects.  */
5096   sfk_deleting_destructor, /* A destructor for complete objects that
5097                               deletes the object after it has been
5098                               destroyed.  */
5099   sfk_conversion,          /* A conversion operator.  */
5100   sfk_deduction_guide,     /* A class template deduction guide.  */
5101   sfk_virtual_destructor   /* Used by member synthesis fns.  */
5102 };
5103
5104 /* The various kinds of linkage.  From [basic.link],
5105
5106       A name is said to have linkage when it might denote the same
5107       object, reference, function, type, template, namespace or value
5108       as a name introduced in another scope:
5109
5110       -- When a name has external linkage, the entity it denotes can
5111          be referred to from scopes of other translation units or from
5112          other scopes of the same translation unit.
5113
5114       -- When a name has internal linkage, the entity it denotes can
5115          be referred to by names from other scopes in the same
5116          translation unit.
5117
5118       -- When a name has no linkage, the entity it denotes cannot be
5119          referred to by names from other scopes.  */
5120
5121 enum linkage_kind {
5122   lk_none,                      /* No linkage.  */
5123   lk_internal,                  /* Internal linkage.  */
5124   lk_external                   /* External linkage.  */
5125 };
5126
5127 enum duration_kind {
5128   dk_static,
5129   dk_thread,
5130   dk_auto,
5131   dk_dynamic
5132 };
5133
5134 /* Bitmask flags to control type substitution.  */
5135 enum tsubst_flags {
5136   tf_none = 0,                   /* nothing special */
5137   tf_error = 1 << 0,             /* give error messages  */
5138   tf_warning = 1 << 1,           /* give warnings too  */
5139   tf_ignore_bad_quals = 1 << 2,  /* ignore bad cvr qualifiers */
5140   tf_keep_type_decl = 1 << 3,    /* retain typedef type decls
5141                                     (make_typename_type use) */
5142   tf_ptrmem_ok = 1 << 4,         /* pointers to member ok (internal
5143                                     instantiate_type use) */
5144   tf_user = 1 << 5,              /* found template must be a user template
5145                                     (lookup_template_class use) */
5146   tf_conv = 1 << 6,              /* We are determining what kind of
5147                                     conversion might be permissible,
5148                                     not actually performing the
5149                                     conversion.  */
5150   tf_decltype = 1 << 7,          /* We are the operand of decltype.
5151                                     Used to implement the special rules
5152                                     for calls in decltype (5.2.2/11).  */
5153   tf_partial = 1 << 8,           /* Doing initial explicit argument
5154                                     substitution in fn_type_unification.  */
5155   tf_fndecl_type = 1 << 9,   /* Substituting the type of a function
5156                                 declaration.  */
5157   tf_no_cleanup = 1 << 10,   /* Do not build a cleanup
5158                                 (build_target_expr and friends) */
5159   /* Convenient substitution flags combinations.  */
5160   tf_warning_or_error = tf_warning | tf_error
5161 };
5162
5163 /* This type is used for parameters and variables which hold
5164    combinations of the flags in enum tsubst_flags.  */
5165 typedef int tsubst_flags_t;
5166
5167 /* The kind of checking we can do looking in a class hierarchy.  */
5168 enum base_access_flags {
5169   ba_any = 0,  /* Do not check access, allow an ambiguous base,
5170                       prefer a non-virtual base */
5171   ba_unique = 1 << 0,  /* Must be a unique base.  */
5172   ba_check_bit = 1 << 1,   /* Check access.  */
5173   ba_check = ba_unique | ba_check_bit,
5174   ba_ignore_scope = 1 << 2 /* Ignore access allowed by local scope.  */
5175 };
5176
5177 /* This type is used for parameters and variables which hold
5178    combinations of the flags in enum base_access_flags.  */
5179 typedef int base_access;
5180
5181 /* The various kinds of access check during parsing.  */
5182 enum deferring_kind {
5183   dk_no_deferred = 0, /* Check access immediately */
5184   dk_deferred = 1,    /* Deferred check */
5185   dk_no_check = 2     /* No access check */
5186 };
5187
5188 /* The kind of base we can find, looking in a class hierarchy.
5189    Values <0 indicate we failed.  */
5190 enum base_kind {
5191   bk_inaccessible = -3,   /* The base is inaccessible */
5192   bk_ambig = -2,          /* The base is ambiguous */
5193   bk_not_base = -1,       /* It is not a base */
5194   bk_same_type = 0,       /* It is the same type */
5195   bk_proper_base = 1,     /* It is a proper base */
5196   bk_via_virtual = 2      /* It is a proper base, but via a virtual
5197                              path. This might not be the canonical
5198                              binfo.  */
5199 };
5200
5201 /* Node for "pointer to (virtual) function".
5202    This may be distinct from ptr_type_node so gdb can distinguish them.  */
5203 #define vfunc_ptr_type_node  vtable_entry_type
5204
5205
5206 /* For building calls to `delete'.  */
5207 extern GTY(()) tree integer_two_node;
5208
5209 /* The number of function bodies which we are currently processing.
5210    (Zero if we are at namespace scope, one inside the body of a
5211    function, two inside the body of a function in a local class, etc.)  */
5212 extern int function_depth;
5213
5214 /* Nonzero if we are inside eq_specializations, which affects comparison of
5215    PARM_DECLs in cp_tree_equal.  */
5216 extern int comparing_specializations;
5217
5218 /* In parser.c.  */
5219
5220 /* Nonzero if we are parsing an unevaluated operand: an operand to
5221    sizeof, typeof, or alignof.  This is a count since operands to
5222    sizeof can be nested.  */
5223
5224 extern int cp_unevaluated_operand;
5225
5226 /* RAII class used to inhibit the evaluation of operands during parsing
5227    and template instantiation. Evaluation warnings are also inhibited. */
5228
5229 struct cp_unevaluated
5230 {
5231   cp_unevaluated ();
5232   ~cp_unevaluated ();
5233 };
5234
5235 /* The reverse: an RAII class used for nested contexts that are evaluated even
5236    if the enclosing context is not.  */
5237
5238 struct cp_evaluated
5239 {
5240   int uneval;
5241   int inhibit;
5242   cp_evaluated ()
5243     : uneval(cp_unevaluated_operand), inhibit(c_inhibit_evaluation_warnings)
5244   { cp_unevaluated_operand = c_inhibit_evaluation_warnings = 0; }
5245   ~cp_evaluated ()
5246   { cp_unevaluated_operand = uneval;
5247     c_inhibit_evaluation_warnings = inhibit; }
5248 };
5249
5250 /* in pt.c  */
5251
5252 /* These values are used for the `STRICT' parameter to type_unification and
5253    fn_type_unification.  Their meanings are described with the
5254    documentation for fn_type_unification.  */
5255
5256 enum unification_kind_t {
5257   DEDUCE_CALL,
5258   DEDUCE_CONV,
5259   DEDUCE_EXACT
5260 };
5261
5262 // An RAII class used to create a new pointer map for local
5263 // specializations. When the stack goes out of scope, the
5264 // previous pointer map is restored.
5265 enum lss_policy { lss_blank, lss_copy };
5266 struct local_specialization_stack
5267 {
5268   local_specialization_stack (lss_policy = lss_blank);
5269   ~local_specialization_stack ();
5270
5271   hash_map<tree, tree> *saved;
5272 };
5273
5274 /* in class.c */
5275
5276 extern int current_class_depth;
5277
5278 /* in decl.c */
5279
5280 /* An array of static vars & fns.  */
5281 extern GTY(()) vec<tree, va_gc> *static_decls;
5282
5283 /* An array of vtable-needing types that have no key function, or have
5284    an emitted key function.  */
5285 extern GTY(()) vec<tree, va_gc> *keyed_classes;
5286 \f
5287 /* Here's where we control how name mangling takes place.  */
5288
5289 /* Cannot use '$' up front, because this confuses gdb
5290    (names beginning with '$' are gdb-local identifiers).
5291
5292    Note that all forms in which the '$' is significant are long enough
5293    for direct indexing (meaning that if we know there is a '$'
5294    at a particular location, we can index into the string at
5295    any other location that provides distinguishing characters).  */
5296
5297 /* Define NO_DOT_IN_LABEL in your favorite tm file if your assembler
5298    doesn't allow '.' in symbol names.  */
5299 #ifndef NO_DOT_IN_LABEL
5300
5301 #define JOINER '.'
5302
5303 #define AUTO_TEMP_NAME "_.tmp_"
5304 #define VFIELD_BASE ".vf"
5305 #define VFIELD_NAME "_vptr."
5306 #define VFIELD_NAME_FORMAT "_vptr.%s"
5307
5308 #else /* NO_DOT_IN_LABEL */
5309
5310 #ifndef NO_DOLLAR_IN_LABEL
5311
5312 #define JOINER '$'
5313
5314 #define AUTO_TEMP_NAME "_$tmp_"
5315 #define VFIELD_BASE "$vf"
5316 #define VFIELD_NAME "_vptr$"
5317 #define VFIELD_NAME_FORMAT "_vptr$%s"
5318
5319 #else /* NO_DOLLAR_IN_LABEL */
5320
5321 #define VTABLE_NAME "__vt_"
5322 #define VTABLE_NAME_P(ID_NODE) \
5323   (!strncmp (IDENTIFIER_POINTER (ID_NODE), VTABLE_NAME, \
5324              sizeof (VTABLE_NAME) - 1))
5325 #define VFIELD_BASE "__vfb"
5326 #define VFIELD_NAME "__vptr_"
5327 #define VFIELD_NAME_P(ID_NODE) \
5328   (!strncmp (IDENTIFIER_POINTER (ID_NODE), VFIELD_NAME, \
5329             sizeof (VFIELD_NAME) - 1))
5330 #define VFIELD_NAME_FORMAT "__vptr_%s"
5331
5332 #endif  /* NO_DOLLAR_IN_LABEL */
5333 #endif  /* NO_DOT_IN_LABEL */
5334
5335 #define LAMBDANAME_PREFIX "__lambda"
5336 #define LAMBDANAME_FORMAT LAMBDANAME_PREFIX "%d"
5337
5338 #define UDLIT_OP_ANSI_PREFIX "operator\"\""
5339 #define UDLIT_OP_ANSI_FORMAT UDLIT_OP_ANSI_PREFIX "%s"
5340 #define UDLIT_OP_MANGLED_PREFIX "li"
5341 #define UDLIT_OP_MANGLED_FORMAT UDLIT_OP_MANGLED_PREFIX "%s"
5342 #define UDLIT_OPER_P(ID_NODE) \
5343   (!strncmp (IDENTIFIER_POINTER (ID_NODE), \
5344              UDLIT_OP_ANSI_PREFIX, \
5345              sizeof (UDLIT_OP_ANSI_PREFIX) - 1))
5346 #define UDLIT_OP_SUFFIX(ID_NODE) \
5347   (IDENTIFIER_POINTER (ID_NODE) + sizeof (UDLIT_OP_ANSI_PREFIX) - 1)
5348
5349 #if !defined(NO_DOLLAR_IN_LABEL) || !defined(NO_DOT_IN_LABEL)
5350
5351 #define VTABLE_NAME_P(ID_NODE) (IDENTIFIER_POINTER (ID_NODE)[1] == 'v' \
5352   && IDENTIFIER_POINTER (ID_NODE)[2] == 't' \
5353   && IDENTIFIER_POINTER (ID_NODE)[3] == JOINER)
5354
5355 #define VFIELD_NAME_P(ID_NODE) \
5356   (!strncmp (IDENTIFIER_POINTER (ID_NODE), VFIELD_NAME, sizeof(VFIELD_NAME)-1))
5357
5358 #endif /* !defined(NO_DOLLAR_IN_LABEL) || !defined(NO_DOT_IN_LABEL) */
5359
5360 \f
5361 /* Nonzero if we're done parsing and into end-of-file activities.
5362    Two if we're done with front-end processing.  */
5363
5364 extern int at_eof;
5365
5366 /* True if note_mangling_alias should enqueue mangling aliases for
5367    later generation, rather than emitting them right away.  */
5368
5369 extern bool defer_mangling_aliases;
5370
5371 /* True if noexcept is part of the type (i.e. in C++17).  */
5372
5373 extern bool flag_noexcept_type;
5374
5375 /* A list of namespace-scope objects which have constructors or
5376    destructors which reside in the global scope.  The decl is stored
5377    in the TREE_VALUE slot and the initializer is stored in the
5378    TREE_PURPOSE slot.  */
5379 extern GTY(()) tree static_aggregates;
5380 /* Likewise, for thread local storage.  */
5381 extern GTY(()) tree tls_aggregates;
5382
5383 enum overload_flags { NO_SPECIAL = 0, DTOR_FLAG, TYPENAME_FLAG };
5384
5385 /* These are uses as bits in flags passed to various functions to
5386    control their behavior.  Despite the LOOKUP_ prefix, many of these
5387    do not control name lookup.  ??? Functions using these flags should
5388    probably be modified to accept explicit boolean flags for the
5389    behaviors relevant to them.  */
5390 /* Check for access violations.  */
5391 #define LOOKUP_PROTECT (1 << 0)
5392 #define LOOKUP_NORMAL (LOOKUP_PROTECT)
5393 /* Even if the function found by lookup is a virtual function, it
5394    should be called directly.  */
5395 #define LOOKUP_NONVIRTUAL (1 << 1)
5396 /* Non-converting (i.e., "explicit") constructors are not tried.  This flag
5397    indicates that we are not performing direct-initialization.  */
5398 #define LOOKUP_ONLYCONVERTING (1 << 2)
5399 #define LOOKUP_IMPLICIT (LOOKUP_NORMAL | LOOKUP_ONLYCONVERTING)
5400 /* If a temporary is created, it should be created so that it lives
5401    as long as the current variable bindings; otherwise it only lives
5402    until the end of the complete-expression.  It also forces
5403    direct-initialization in cases where other parts of the compiler
5404    have already generated a temporary, such as reference
5405    initialization and the catch parameter.  */
5406 #define DIRECT_BIND (1 << 3)
5407 /* We're performing a user-defined conversion, so more user-defined
5408    conversions are not permitted (only built-in conversions).  */
5409 #define LOOKUP_NO_CONVERSION (1 << 4)
5410 /* The user has explicitly called a destructor.  (Therefore, we do
5411    not need to check that the object is non-NULL before calling the
5412    destructor.)  */
5413 #define LOOKUP_DESTRUCTOR (1 << 5)
5414 /* Do not permit references to bind to temporaries.  */
5415 #define LOOKUP_NO_TEMP_BIND (1 << 6)
5416 /* Do not accept objects, and possibly namespaces.  */
5417 #define LOOKUP_PREFER_TYPES (1 << 7)
5418 /* Do not accept objects, and possibly types.   */
5419 #define LOOKUP_PREFER_NAMESPACES (1 << 8)
5420 /* Accept types or namespaces.  */
5421 #define LOOKUP_PREFER_BOTH (LOOKUP_PREFER_TYPES | LOOKUP_PREFER_NAMESPACES)
5422 /* Return friend declarations and un-declared builtin functions.
5423    (Normally, these entities are registered in the symbol table, but
5424    not found by lookup.)  */
5425 #define LOOKUP_HIDDEN (LOOKUP_PREFER_NAMESPACES << 1)
5426 /* We're trying to treat an lvalue as an rvalue.  */
5427 #define LOOKUP_PREFER_RVALUE (LOOKUP_HIDDEN << 1)
5428 /* We're inside an init-list, so narrowing conversions are ill-formed.  */
5429 #define LOOKUP_NO_NARROWING (LOOKUP_PREFER_RVALUE << 1)
5430 /* We're looking up a constructor for list-initialization.  */
5431 #define LOOKUP_LIST_INIT_CTOR (LOOKUP_NO_NARROWING << 1)
5432 /* This is the first parameter of a copy constructor.  */
5433 #define LOOKUP_COPY_PARM (LOOKUP_LIST_INIT_CTOR << 1)
5434 /* We only want to consider list constructors.  */
5435 #define LOOKUP_LIST_ONLY (LOOKUP_COPY_PARM << 1)
5436 /* Return after determining which function to call and checking access.
5437    Used by sythesized_method_walk to determine which functions will
5438    be called to initialize subobjects, in order to determine exception
5439    specification and possible implicit delete.
5440    This is kind of a hack, but exiting early avoids problems with trying
5441    to perform argument conversions when the class isn't complete yet.  */
5442 #define LOOKUP_SPECULATIVE (LOOKUP_LIST_ONLY << 1)
5443 /* Used by calls from defaulted functions to limit the overload set to avoid
5444    cycles trying to declare them (core issue 1092).  */
5445 #define LOOKUP_DEFAULTED (LOOKUP_SPECULATIVE << 1)
5446 /* Used in calls to store_init_value to suppress its usual call to
5447    digest_init.  */
5448 #define LOOKUP_ALREADY_DIGESTED (LOOKUP_DEFAULTED << 1)
5449 /* An instantiation with explicit template arguments.  */
5450 #define LOOKUP_EXPLICIT_TMPL_ARGS (LOOKUP_ALREADY_DIGESTED << 1)
5451 /* Like LOOKUP_NO_TEMP_BIND, but also prevent binding to xvalues.  */
5452 #define LOOKUP_NO_RVAL_BIND (LOOKUP_EXPLICIT_TMPL_ARGS << 1)
5453 /* Used by case_conversion to disregard non-integral conversions.  */
5454 #define LOOKUP_NO_NON_INTEGRAL (LOOKUP_NO_RVAL_BIND << 1)
5455 /* Used for delegating constructors in order to diagnose self-delegation.  */
5456 #define LOOKUP_DELEGATING_CONS (LOOKUP_NO_NON_INTEGRAL << 1)
5457
5458 #define LOOKUP_NAMESPACES_ONLY(F)  \
5459   (((F) & LOOKUP_PREFER_NAMESPACES) && !((F) & LOOKUP_PREFER_TYPES))
5460 #define LOOKUP_TYPES_ONLY(F)  \
5461   (!((F) & LOOKUP_PREFER_NAMESPACES) && ((F) & LOOKUP_PREFER_TYPES))
5462 #define LOOKUP_QUALIFIERS_ONLY(F)     ((F) & LOOKUP_PREFER_BOTH)
5463
5464
5465 /* These flags are used by the conversion code.
5466    CONV_IMPLICIT   :  Perform implicit conversions (standard and user-defined).
5467    CONV_STATIC     :  Perform the explicit conversions for static_cast.
5468    CONV_CONST      :  Perform the explicit conversions for const_cast.
5469    CONV_REINTERPRET:  Perform the explicit conversions for reinterpret_cast.
5470    CONV_PRIVATE    :  Perform upcasts to private bases.
5471    CONV_FORCE_TEMP :  Require a new temporary when converting to the same
5472                       aggregate type.  */
5473
5474 #define CONV_IMPLICIT    1
5475 #define CONV_STATIC      2
5476 #define CONV_CONST       4
5477 #define CONV_REINTERPRET 8
5478 #define CONV_PRIVATE     16
5479 /* #define CONV_NONCONVERTING 32 */
5480 #define CONV_FORCE_TEMP  64
5481 #define CONV_FOLD        128
5482 #define CONV_OLD_CONVERT (CONV_IMPLICIT | CONV_STATIC | CONV_CONST \
5483                           | CONV_REINTERPRET)
5484 #define CONV_C_CAST      (CONV_IMPLICIT | CONV_STATIC | CONV_CONST \
5485                           | CONV_REINTERPRET | CONV_PRIVATE | CONV_FORCE_TEMP)
5486 #define CONV_BACKEND_CONVERT (CONV_OLD_CONVERT | CONV_FOLD)
5487
5488 /* Used by build_expr_type_conversion to indicate which types are
5489    acceptable as arguments to the expression under consideration.  */
5490
5491 #define WANT_INT        1 /* integer types, including bool */
5492 #define WANT_FLOAT      2 /* floating point types */
5493 #define WANT_ENUM       4 /* enumerated types */
5494 #define WANT_POINTER    8 /* pointer types */
5495 #define WANT_NULL      16 /* null pointer constant */
5496 #define WANT_VECTOR_OR_COMPLEX 32 /* vector or complex types */
5497 #define WANT_ARITH      (WANT_INT | WANT_FLOAT | WANT_VECTOR_OR_COMPLEX)
5498
5499 /* Used with comptypes, and related functions, to guide type
5500    comparison.  */
5501
5502 #define COMPARE_STRICT        0 /* Just check if the types are the
5503                                    same.  */
5504 #define COMPARE_BASE          1 /* Check to see if the second type is
5505                                    derived from the first.  */
5506 #define COMPARE_DERIVED       2 /* Like COMPARE_BASE, but in
5507                                    reverse.  */
5508 #define COMPARE_REDECLARATION 4 /* The comparison is being done when
5509                                    another declaration of an existing
5510                                    entity is seen.  */
5511 #define COMPARE_STRUCTURAL    8 /* The comparison is intended to be
5512                                    structural. The actual comparison
5513                                    will be identical to
5514                                    COMPARE_STRICT.  */
5515
5516 /* Used with start function.  */
5517 #define SF_DEFAULT           0  /* No flags.  */
5518 #define SF_PRE_PARSED        1  /* The function declaration has
5519                                    already been parsed.  */
5520 #define SF_INCLASS_INLINE    2  /* The function is an inline, defined
5521                                    in the class body.  */
5522
5523 /* Used with start_decl's initialized parameter.  */
5524 #define SD_UNINITIALIZED     0
5525 #define SD_INITIALIZED       1
5526 #define SD_DEFAULTED         2
5527 #define SD_DELETED           3
5528
5529 /* Returns nonzero iff TYPE1 and TYPE2 are the same type, or if TYPE2
5530    is derived from TYPE1, or if TYPE2 is a pointer (reference) to a
5531    class derived from the type pointed to (referred to) by TYPE1.  */
5532 #define same_or_base_type_p(TYPE1, TYPE2) \
5533   comptypes ((TYPE1), (TYPE2), COMPARE_BASE)
5534
5535 /* These macros are used to access a TEMPLATE_PARM_INDEX.  */
5536 #define TEMPLATE_PARM_INDEX_CAST(NODE) \
5537         ((template_parm_index*)TEMPLATE_PARM_INDEX_CHECK (NODE))
5538 #define TEMPLATE_PARM_IDX(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->index)
5539 #define TEMPLATE_PARM_LEVEL(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->level)
5540 #define TEMPLATE_PARM_DESCENDANTS(NODE) (TREE_CHAIN (NODE))
5541 #define TEMPLATE_PARM_ORIG_LEVEL(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->orig_level)
5542 #define TEMPLATE_PARM_DECL(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->decl)
5543 #define TEMPLATE_PARM_PARAMETER_PACK(NODE) \
5544   (TREE_LANG_FLAG_0 (TEMPLATE_PARM_INDEX_CHECK (NODE)))
5545
5546 /* These macros are for accessing the fields of TEMPLATE_TYPE_PARM,
5547    TEMPLATE_TEMPLATE_PARM and BOUND_TEMPLATE_TEMPLATE_PARM nodes.  */
5548 #define TEMPLATE_TYPE_PARM_INDEX(NODE)                                  \
5549   (TYPE_VALUES_RAW (TREE_CHECK3 ((NODE), TEMPLATE_TYPE_PARM,            \
5550                                  TEMPLATE_TEMPLATE_PARM,                \
5551                                  BOUND_TEMPLATE_TEMPLATE_PARM)))
5552 #define TEMPLATE_TYPE_IDX(NODE) \
5553   (TEMPLATE_PARM_IDX (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5554 #define TEMPLATE_TYPE_LEVEL(NODE) \
5555   (TEMPLATE_PARM_LEVEL (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5556 #define TEMPLATE_TYPE_ORIG_LEVEL(NODE) \
5557   (TEMPLATE_PARM_ORIG_LEVEL (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5558 #define TEMPLATE_TYPE_DECL(NODE) \
5559   (TEMPLATE_PARM_DECL (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5560 #define TEMPLATE_TYPE_PARAMETER_PACK(NODE) \
5561   (TEMPLATE_PARM_PARAMETER_PACK (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5562
5563 /* For a C++17 class deduction placeholder, the template it represents.  */
5564 #define CLASS_PLACEHOLDER_TEMPLATE(NODE) \
5565   (DECL_INITIAL (TYPE_NAME (TEMPLATE_TYPE_PARM_CHECK (NODE))))
5566
5567 /* Contexts in which auto deduction occurs. These flags are
5568    used to control diagnostics in do_auto_deduction.  */
5569
5570 enum auto_deduction_context
5571 {
5572   adc_unspecified,   /* Not given */
5573   adc_variable_type, /* Variable initializer deduction */
5574   adc_return_type,   /* Return type deduction */
5575   adc_unify,         /* Template argument deduction */
5576   adc_requirement,   /* Argument deduction constraint */
5577   adc_decomp_type    /* Decomposition declaration initializer deduction */
5578 };
5579
5580 /* True if this type-parameter belongs to a class template, used by C++17
5581    class template argument deduction.  */
5582 #define TEMPLATE_TYPE_PARM_FOR_CLASS(NODE) \
5583   (TREE_LANG_FLAG_0 (TEMPLATE_TYPE_PARM_CHECK (NODE)))
5584
5585 /* True iff this TEMPLATE_TYPE_PARM represents decltype(auto).  */
5586 #define AUTO_IS_DECLTYPE(NODE) \
5587   (TYPE_LANG_FLAG_5 (TEMPLATE_TYPE_PARM_CHECK (NODE)))
5588
5589 /* These constants can used as bit flags in the process of tree formatting.
5590
5591    TFF_PLAIN_IDENTIFIER: unqualified part of a name.
5592    TFF_SCOPE: include the class and namespace scope of the name.
5593    TFF_CHASE_TYPEDEF: print the original type-id instead of the typedef-name.
5594    TFF_DECL_SPECIFIERS: print decl-specifiers.
5595    TFF_CLASS_KEY_OR_ENUM: precede a class-type name (resp. enum name) with
5596        a class-key (resp. `enum').
5597    TFF_RETURN_TYPE: include function return type.
5598    TFF_FUNCTION_DEFAULT_ARGUMENTS: include function default parameter values.
5599    TFF_EXCEPTION_SPECIFICATION: show function exception specification.
5600    TFF_TEMPLATE_HEADER: show the template<...> header in a
5601        template-declaration.
5602    TFF_TEMPLATE_NAME: show only template-name.
5603    TFF_EXPR_IN_PARENS: parenthesize expressions.
5604    TFF_NO_FUNCTION_ARGUMENTS: don't show function arguments.
5605    TFF_UNQUALIFIED_NAME: do not print the qualifying scope of the
5606        top-level entity.
5607    TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS: do not omit template arguments
5608        identical to their defaults.
5609    TFF_NO_TEMPLATE_BINDINGS: do not print information about the template
5610        arguments for a function template specialization.
5611    TFF_POINTER: we are printing a pointer type.  */
5612
5613 #define TFF_PLAIN_IDENTIFIER                    (0)
5614 #define TFF_SCOPE                               (1)
5615 #define TFF_CHASE_TYPEDEF                       (1 << 1)
5616 #define TFF_DECL_SPECIFIERS                     (1 << 2)
5617 #define TFF_CLASS_KEY_OR_ENUM                   (1 << 3)
5618 #define TFF_RETURN_TYPE                         (1 << 4)
5619 #define TFF_FUNCTION_DEFAULT_ARGUMENTS          (1 << 5)
5620 #define TFF_EXCEPTION_SPECIFICATION             (1 << 6)
5621 #define TFF_TEMPLATE_HEADER                     (1 << 7)
5622 #define TFF_TEMPLATE_NAME                       (1 << 8)
5623 #define TFF_EXPR_IN_PARENS                      (1 << 9)
5624 #define TFF_NO_FUNCTION_ARGUMENTS               (1 << 10)
5625 #define TFF_UNQUALIFIED_NAME                    (1 << 11)
5626 #define TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS  (1 << 12)
5627 #define TFF_NO_TEMPLATE_BINDINGS                (1 << 13)
5628 #define TFF_POINTER                             (1 << 14)
5629
5630 /* Returns the TEMPLATE_DECL associated to a TEMPLATE_TEMPLATE_PARM
5631    node.  */
5632 #define TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL(NODE)      \
5633   ((TREE_CODE (NODE) == BOUND_TEMPLATE_TEMPLATE_PARM)   \
5634    ? TYPE_TI_TEMPLATE (NODE)                            \
5635    : TYPE_NAME (NODE))
5636
5637 /* in lex.c  */
5638
5639 extern void init_reswords (void);
5640
5641 /* Various flags for the overloaded operator information.  */
5642 enum ovl_op_flags
5643   {
5644     OVL_OP_FLAG_NONE = 0,       /* Don't care.  */
5645     OVL_OP_FLAG_UNARY = 1,      /* Is unary.  */
5646     OVL_OP_FLAG_BINARY = 2,     /* Is binary.  */
5647     OVL_OP_FLAG_AMBIARY = 3,    /* May be unary or binary.  */
5648     OVL_OP_FLAG_ALLOC = 4,      /* operator new or delete.  */
5649     OVL_OP_FLAG_DELETE = 1,     /* operator delete.  */
5650     OVL_OP_FLAG_VEC = 2         /* vector new or delete.  */
5651   };
5652
5653 /* Compressed operator codes.  Order is determined by operators.def
5654    and does not match that of tree_codes.  */
5655 enum ovl_op_code
5656   {
5657     OVL_OP_ERROR_MARK,
5658     OVL_OP_NOP_EXPR,
5659 #define DEF_OPERATOR(NAME, CODE, MANGLING, FLAGS) OVL_OP_##CODE,
5660 #define DEF_ASSN_OPERATOR(NAME, CODE, MANGLING) /* NOTHING */
5661 #include "operators.def"
5662     OVL_OP_MAX
5663   };
5664
5665 struct GTY(()) ovl_op_info_t {
5666   /* The IDENTIFIER_NODE for the operator.  */
5667   tree identifier;
5668   /* The name of the operator.  */
5669   const char *name;
5670   /* The mangled name of the operator.  */
5671   const char *mangled_name;
5672   /* The (regular) tree code.  */
5673   enum tree_code tree_code : 16;
5674   /* The (compressed) operator code.  */
5675   enum ovl_op_code ovl_op_code : 8;
5676   /* The ovl_op_flags of the operator */
5677   unsigned flags : 8;
5678 };
5679
5680 /* Overloaded operator info indexed by ass_op_p & ovl_op_code.  */
5681 extern GTY(()) ovl_op_info_t ovl_op_info[2][OVL_OP_MAX];
5682 /* Mapping from tree_codes to ovl_op_codes.  */
5683 extern GTY(()) unsigned char ovl_op_mapping[MAX_TREE_CODES];
5684 /* Mapping for ambi-ary operators from the binary to the unary.  */
5685 extern GTY(()) unsigned char ovl_op_alternate[OVL_OP_MAX];
5686
5687 /* Given an ass_op_p boolean and a tree code, return a pointer to its
5688    overloaded operator info.  Tree codes for non-overloaded operators
5689    map to the error-operator.  */
5690 #define OVL_OP_INFO(IS_ASS_P, TREE_CODE)                        \
5691   (&ovl_op_info[(IS_ASS_P) != 0][ovl_op_mapping[(TREE_CODE)]])
5692 /* Overloaded operator info for an identifier for which
5693    IDENTIFIER_OVL_OP_P is true.  */
5694 #define IDENTIFIER_OVL_OP_INFO(NODE) \
5695   (&ovl_op_info[IDENTIFIER_KIND_BIT_0 (NODE)][IDENTIFIER_CP_INDEX (NODE)])
5696 #define IDENTIFIER_OVL_OP_FLAGS(NODE) \
5697   (IDENTIFIER_OVL_OP_INFO (NODE)->flags)
5698
5699 /* A type-qualifier, or bitmask therefore, using the TYPE_QUAL
5700    constants.  */
5701
5702 typedef int cp_cv_quals;
5703
5704 /* Non-static member functions have an optional virt-specifier-seq.
5705    There is a VIRT_SPEC value for each virt-specifier.
5706    They can be combined by bitwise-or to form the complete set of
5707    virt-specifiers for a member function.  */
5708 enum virt_specifier
5709   {
5710     VIRT_SPEC_UNSPECIFIED = 0x0,
5711     VIRT_SPEC_FINAL       = 0x1,
5712     VIRT_SPEC_OVERRIDE    = 0x2
5713   };
5714
5715 /* A type-qualifier, or bitmask therefore, using the VIRT_SPEC
5716    constants.  */
5717
5718 typedef int cp_virt_specifiers;
5719
5720 /* Wherever there is a function-cv-qual, there could also be a ref-qualifier:
5721
5722    [dcl.fct]
5723    The return type, the parameter-type-list, the ref-qualifier, and
5724    the cv-qualifier-seq, but not the default arguments or the exception
5725    specification, are part of the function type.
5726
5727    REF_QUAL_NONE    Ordinary member function with no ref-qualifier
5728    REF_QUAL_LVALUE  Member function with the &-ref-qualifier
5729    REF_QUAL_RVALUE  Member function with the &&-ref-qualifier */
5730
5731 enum cp_ref_qualifier {
5732   REF_QUAL_NONE = 0,
5733   REF_QUAL_LVALUE = 1,
5734   REF_QUAL_RVALUE = 2
5735 };
5736
5737 /* A storage class.  */
5738
5739 enum cp_storage_class {
5740   /* sc_none must be zero so that zeroing a cp_decl_specifier_seq
5741      sets the storage_class field to sc_none.  */
5742   sc_none = 0,
5743   sc_auto,
5744   sc_register,
5745   sc_static,
5746   sc_extern,
5747   sc_mutable
5748 };
5749
5750 /* An individual decl-specifier.  This is used to index the array of
5751    locations for the declspecs in struct cp_decl_specifier_seq
5752    below.  */
5753
5754 enum cp_decl_spec {
5755   ds_first,
5756   ds_signed = ds_first,
5757   ds_unsigned,
5758   ds_short,
5759   ds_long,
5760   ds_const,
5761   ds_volatile,
5762   ds_restrict,
5763   ds_inline,
5764   ds_virtual,
5765   ds_explicit,
5766   ds_friend,
5767   ds_typedef,
5768   ds_alias,
5769   ds_constexpr,
5770   ds_complex,
5771   ds_thread,
5772   ds_type_spec,
5773   ds_redefined_builtin_type_spec,
5774   ds_attribute,
5775   ds_std_attribute,
5776   ds_storage_class,
5777   ds_long_long,
5778   ds_concept,
5779   ds_last /* This enumerator must always be the last one.  */
5780 };
5781
5782 /* A decl-specifier-seq.  */
5783
5784 struct cp_decl_specifier_seq {
5785   /* An array of locations for the declaration sepecifiers, indexed by
5786      enum cp_decl_spec_word.  */
5787   location_t locations[ds_last];
5788   /* The primary type, if any, given by the decl-specifier-seq.
5789      Modifiers, like "short", "const", and "unsigned" are not
5790      reflected here.  This field will be a TYPE, unless a typedef-name
5791      was used, in which case it will be a TYPE_DECL.  */
5792   tree type;
5793   /* The attributes, if any, provided with the specifier sequence.  */
5794   tree attributes;
5795   /* The c++11 attributes that follows the type specifier.  */
5796   tree std_attributes;
5797   /* If non-NULL, a built-in type that the user attempted to redefine
5798      to some other type.  */
5799   tree redefined_builtin_type;
5800   /* The explicit-specifier, if any.  */
5801   tree explicit_specifier;
5802   /* The storage class specified -- or sc_none if no storage class was
5803      explicitly specified.  */
5804   cp_storage_class storage_class;
5805   /* For the __intN declspec, this stores the index into the int_n_* arrays.  */
5806   int int_n_idx;
5807   /* True iff TYPE_SPEC defines a class or enum.  */
5808   BOOL_BITFIELD type_definition_p : 1;
5809   /* True iff multiple types were (erroneously) specified for this
5810      decl-specifier-seq.  */
5811   BOOL_BITFIELD multiple_types_p : 1;
5812   /* True iff multiple storage classes were (erroneously) specified
5813      for this decl-specifier-seq or a combination of a storage class
5814      with a typedef specifier.  */
5815   BOOL_BITFIELD conflicting_specifiers_p : 1;
5816   /* True iff at least one decl-specifier was found.  */
5817   BOOL_BITFIELD any_specifiers_p : 1;
5818   /* True iff at least one type-specifier was found.  */
5819   BOOL_BITFIELD any_type_specifiers_p : 1;
5820   /* True iff "int" was explicitly provided.  */
5821   BOOL_BITFIELD explicit_int_p : 1;
5822   /* True iff "__intN" was explicitly provided.  */
5823   BOOL_BITFIELD explicit_intN_p : 1;
5824   /* True iff "char" was explicitly provided.  */
5825   BOOL_BITFIELD explicit_char_p : 1;
5826   /* True iff ds_thread is set for __thread, not thread_local.  */
5827   BOOL_BITFIELD gnu_thread_keyword_p : 1;
5828   /* True iff the type is a decltype.  */
5829   BOOL_BITFIELD decltype_p : 1;
5830 };
5831
5832 /* The various kinds of declarators.  */
5833
5834 enum cp_declarator_kind {
5835   cdk_id,
5836   cdk_function,
5837   cdk_array,
5838   cdk_pointer,
5839   cdk_reference,
5840   cdk_ptrmem,
5841   cdk_decomp,
5842   cdk_error
5843 };
5844
5845 /* A declarator.  */
5846
5847 typedef struct cp_declarator cp_declarator;
5848
5849 typedef struct cp_parameter_declarator cp_parameter_declarator;
5850
5851 /* A parameter, before it has been semantically analyzed.  */
5852 struct cp_parameter_declarator {
5853   /* The next parameter, or NULL_TREE if none.  */
5854   cp_parameter_declarator *next;
5855   /* The decl-specifiers-seq for the parameter.  */
5856   cp_decl_specifier_seq decl_specifiers;
5857   /* The declarator for the parameter.  */
5858   cp_declarator *declarator;
5859   /* The default-argument expression, or NULL_TREE, if none.  */
5860   tree default_argument;
5861   /* True iff this is a template parameter pack.  */
5862   bool template_parameter_pack_p;
5863   /* Location within source.  */
5864   location_t loc;
5865 };
5866
5867 /* A declarator.  */
5868 struct cp_declarator {
5869   /* The kind of declarator.  */
5870   ENUM_BITFIELD (cp_declarator_kind) kind : 4;
5871   /* Whether we parsed an ellipsis (`...') just before the declarator,
5872      to indicate this is a parameter pack.  */
5873   BOOL_BITFIELD parameter_pack_p : 1;
5874   /* If this declarator is parenthesized, this the open-paren.  It is
5875      UNKNOWN_LOCATION when not parenthesized.  */
5876   location_t parenthesized;
5877
5878   location_t id_loc; /* Currently only set for cdk_id, cdk_decomp and
5879                         cdk_function. */
5880   /* GNU Attributes that apply to this declarator.  If the declarator
5881      is a pointer or a reference, these attribute apply to the type
5882      pointed to.  */
5883   tree attributes;
5884   /* Standard C++11 attributes that apply to this declarator.  If the
5885      declarator is a pointer or a reference, these attributes apply
5886      to the pointer, rather than to the type pointed to.  */
5887   tree std_attributes;
5888   /* For all but cdk_id, cdk_decomp and cdk_error, the contained declarator.
5889      For cdk_id, cdk_decomp and cdk_error, guaranteed to be NULL.  */
5890   cp_declarator *declarator;
5891   union {
5892     /* For identifiers.  */
5893     struct {
5894       /* If non-NULL, the qualifying scope (a NAMESPACE_DECL or
5895          *_TYPE) for this identifier.  */
5896       tree qualifying_scope;
5897       /* The unqualified name of the entity -- an IDENTIFIER_NODE,
5898          BIT_NOT_EXPR, or TEMPLATE_ID_EXPR.  */
5899       tree unqualified_name;
5900       /* If this is the name of a function, what kind of special
5901          function (if any).  */
5902       special_function_kind sfk;
5903     } id;
5904     /* For functions.  */
5905     struct {
5906       /* The parameters to the function as a TREE_LIST of decl/default.  */
5907       tree parameters;
5908       /* The cv-qualifiers for the function.  */
5909       cp_cv_quals qualifiers;
5910       /* The virt-specifiers for the function.  */
5911       cp_virt_specifiers virt_specifiers;
5912       /* The ref-qualifier for the function.  */
5913       cp_ref_qualifier ref_qualifier;
5914       /* The transaction-safety qualifier for the function.  */
5915       tree tx_qualifier;
5916       /* The exception-specification for the function.  */
5917       tree exception_specification;
5918       /* The late-specified return type, if any.  */
5919       tree late_return_type;
5920       /* The trailing requires-clause, if any. */
5921       tree requires_clause;
5922     } function;
5923     /* For arrays.  */
5924     struct {
5925       /* The bounds to the array.  */
5926       tree bounds;
5927     } array;
5928     /* For cdk_pointer and cdk_ptrmem.  */
5929     struct {
5930       /* The cv-qualifiers for the pointer.  */
5931       cp_cv_quals qualifiers;
5932       /* For cdk_ptrmem, the class type containing the member.  */
5933       tree class_type;
5934     } pointer;
5935     /* For cdk_reference */
5936     struct {
5937       /* The cv-qualifiers for the reference.  These qualifiers are
5938          only used to diagnose ill-formed code.  */
5939       cp_cv_quals qualifiers;
5940       /* Whether this is an rvalue reference */
5941       bool rvalue_ref;
5942     } reference;
5943   } u;
5944 };
5945
5946 /* A level of template instantiation.  */
5947 struct GTY((chain_next ("%h.next"))) tinst_level {
5948   /* The immediately deeper level in the chain.  */
5949   struct tinst_level *next;
5950
5951   /* The original node.  TLDCL can be a DECL (for a function or static
5952      data member), a TYPE (for a class), depending on what we were
5953      asked to instantiate, or a TREE_LIST with the template as PURPOSE
5954      and the template args as VALUE, if we are substituting for
5955      overload resolution.  In all these cases, TARGS is NULL.
5956      However, to avoid creating TREE_LIST objects for substitutions if
5957      we can help, we store PURPOSE and VALUE in TLDCL and TARGS,
5958      respectively.  So TLDCL stands for TREE_LIST or DECL (the
5959      template is a DECL too), whereas TARGS stands for the template
5960      arguments.  */
5961   tree tldcl, targs;
5962
5963  private:
5964   /* Return TRUE iff the original node is a split list.  */
5965   bool split_list_p () const { return targs; }
5966
5967   /* Return TRUE iff the original node is a TREE_LIST object.  */
5968   bool tree_list_p () const
5969   {
5970     return !split_list_p () && TREE_CODE (tldcl) == TREE_LIST;
5971   }
5972
5973   /* Return TRUE iff the original node is not a list, split or not.  */
5974   bool not_list_p () const
5975   {
5976     return !split_list_p () && !tree_list_p ();
5977   }
5978
5979   /* Convert (in place) the original node from a split list to a
5980      TREE_LIST.  */
5981   tree to_list ();
5982
5983  public:
5984   /* Release storage for OBJ and node, if it's a TREE_LIST.  */
5985   static void free (tinst_level *obj);
5986
5987   /* Return TRUE iff the original node is a list, split or not.  */
5988   bool list_p () const { return !not_list_p (); }
5989
5990   /* Return the original node; if it's a split list, make it a
5991      TREE_LIST first, so that it can be returned as a single tree
5992      object.  */
5993   tree get_node () {
5994     if (!split_list_p ()) return tldcl;
5995     else return to_list ();
5996   }
5997
5998   /* Return the original node if it's a DECL or a TREE_LIST, but do
5999      NOT convert a split list to a TREE_LIST: return NULL instead.  */
6000   tree maybe_get_node () const {
6001     if (!split_list_p ()) return tldcl;
6002     else return NULL_TREE;
6003   }
6004
6005   /* The location where the template is instantiated.  */
6006   location_t locus;
6007
6008   /* errorcount + sorrycount when we pushed this level.  */
6009   unsigned short errors;
6010
6011   /* Count references to this object.  If refcount reaches
6012      refcount_infinity value, we don't increment or decrement the
6013      refcount anymore, as the refcount isn't accurate anymore.
6014      The object can be still garbage collected if unreferenced from
6015      anywhere, which might keep referenced objects referenced longer than
6016      otherwise necessary.  Hitting the infinity is rare though.  */
6017   unsigned short refcount;
6018
6019   /* Infinity value for the above refcount.  */
6020   static const unsigned short refcount_infinity = (unsigned short) ~0;
6021 };
6022
6023 /* BUILT_IN_FRONTEND function codes.  */
6024 enum cp_built_in_function {
6025   CP_BUILT_IN_IS_CONSTANT_EVALUATED,
6026   CP_BUILT_IN_INTEGER_PACK,
6027   CP_BUILT_IN_LAST
6028 };
6029
6030 bool decl_spec_seq_has_spec_p (const cp_decl_specifier_seq *, cp_decl_spec);
6031
6032 /* Return the type of the `this' parameter of FNTYPE.  */
6033
6034 inline tree
6035 type_of_this_parm (const_tree fntype)
6036 {
6037   function_args_iterator iter;
6038   gcc_assert (TREE_CODE (fntype) == METHOD_TYPE);
6039   function_args_iter_init (&iter, fntype);
6040   return function_args_iter_cond (&iter);
6041 }
6042
6043 /* Return the class of the `this' parameter of FNTYPE.  */
6044
6045 inline tree
6046 class_of_this_parm (const_tree fntype)
6047 {
6048   return TREE_TYPE (type_of_this_parm (fntype));
6049 }
6050
6051 /* True iff T is a variable template declaration. */
6052 inline bool
6053 variable_template_p (tree t)
6054 {
6055   if (TREE_CODE (t) != TEMPLATE_DECL)
6056     return false;
6057   if (!PRIMARY_TEMPLATE_P (t))
6058     return false;
6059   if (tree r = DECL_TEMPLATE_RESULT (t))
6060     return VAR_P (r);
6061   return false;
6062 }
6063
6064 /* True iff T is a variable concept definition. That is, T is
6065    a variable template declared with the concept specifier. */
6066 inline bool
6067 variable_concept_p (tree t)
6068 {
6069   if (TREE_CODE (t) != TEMPLATE_DECL)
6070     return false;
6071   if (tree r = DECL_TEMPLATE_RESULT (t))
6072     return VAR_P (r) && DECL_DECLARED_CONCEPT_P (r);
6073   return false;
6074 }
6075
6076 /* True iff T is a concept definition. That is, T is a variable or function
6077    template declared with the concept specifier. */
6078 inline bool
6079 concept_template_p (tree t)
6080 {
6081   if (TREE_CODE (t) != TEMPLATE_DECL)
6082     return false;
6083   if (tree r = DECL_TEMPLATE_RESULT (t))
6084     return VAR_OR_FUNCTION_DECL_P (r) && DECL_DECLARED_CONCEPT_P (r);
6085   return false;
6086 }
6087
6088 /* A parameter list indicating for a function with no parameters,
6089    e.g  "int f(void)".  */
6090 extern cp_parameter_declarator *no_parameters;
6091
6092 /* Various dump ids.  */
6093 extern int class_dump_id;
6094 extern int raw_dump_id;
6095
6096 /* in call.c */
6097 extern bool check_dtor_name                     (tree, tree);
6098 int magic_varargs_p                             (tree);
6099
6100 extern tree build_conditional_expr              (location_t, tree, tree, tree,
6101                                                  tsubst_flags_t);
6102 extern tree build_addr_func                     (tree, tsubst_flags_t);
6103 extern void set_flags_from_callee               (tree);
6104 extern tree build_call_a                        (tree, int, tree*);
6105 extern tree build_call_n                        (tree, int, ...);
6106 extern bool null_ptr_cst_p                      (tree);
6107 extern bool null_member_pointer_value_p         (tree);
6108 extern bool sufficient_parms_p                  (const_tree);
6109 extern tree type_decays_to                      (tree);
6110 extern tree extract_call_expr                   (tree);
6111 extern tree build_trivial_dtor_call             (tree);
6112 extern tree build_user_type_conversion          (tree, tree, int,
6113                                                  tsubst_flags_t);
6114 extern tree build_new_function_call             (tree, vec<tree, va_gc> **,
6115                                                  tsubst_flags_t);
6116 extern tree build_operator_new_call             (tree, vec<tree, va_gc> **,
6117                                                  tree *, tree *, tree, tree,
6118                                                  tree *, tsubst_flags_t);
6119 extern tree build_new_method_call               (tree, tree,
6120                                                  vec<tree, va_gc> **, tree,
6121                                                  int, tree *, tsubst_flags_t);
6122 extern tree build_special_member_call           (tree, tree,
6123                                                  vec<tree, va_gc> **,
6124                                                  tree, int, tsubst_flags_t);
6125 extern tree build_new_op                        (location_t, enum tree_code,
6126                                                  int, tree, tree, tree, tree *,
6127                                                  tsubst_flags_t);
6128 extern tree build_op_call                       (tree, vec<tree, va_gc> **,
6129                                                  tsubst_flags_t);
6130 extern bool aligned_allocation_fn_p             (tree);
6131 extern tree destroying_delete_p                 (tree);
6132 extern bool usual_deallocation_fn_p             (tree);
6133 extern tree build_op_delete_call                (enum tree_code, tree, tree,
6134                                                  bool, tree, tree,
6135                                                  tsubst_flags_t);
6136 extern bool can_convert                         (tree, tree, tsubst_flags_t);
6137 extern bool can_convert_standard                (tree, tree, tsubst_flags_t);
6138 extern bool can_convert_arg                     (tree, tree, tree, int,
6139                                                  tsubst_flags_t);
6140 extern bool can_convert_arg_bad                 (tree, tree, tree, int,
6141                                                  tsubst_flags_t);
6142 extern int conv_flags                           (int, int, tree, tree, int);
6143 extern struct conversion * good_conversion      (tree, tree, tree, int, tsubst_flags_t);
6144 extern location_t get_fndecl_argument_location  (tree, int);
6145 extern void complain_about_bad_argument (location_t arg_loc,
6146                                                  tree from_type, tree to_type,
6147                                                  tree fndecl, int parmnum);
6148
6149
6150 /* A class for recording information about access failures (e.g. private
6151    fields), so that we can potentially supply a fix-it hint about
6152    an accessor (from a context in which the constness of the object
6153    is known).  */
6154
6155 class access_failure_info
6156 {
6157  public:
6158   access_failure_info () : m_was_inaccessible (false),
6159     m_basetype_path (NULL_TREE),
6160     m_decl (NULL_TREE), m_diag_decl (NULL_TREE) {}
6161
6162   void record_access_failure (tree basetype_path, tree decl, tree diag_decl);
6163
6164   bool was_inaccessible_p () const { return m_was_inaccessible; }
6165   tree get_decl () const { return m_decl; }
6166   tree get_diag_decl () const { return m_diag_decl; }
6167   tree get_any_accessor (bool const_p) const;
6168   void maybe_suggest_accessor (bool const_p) const;
6169   static void add_fixit_hint (rich_location *richloc, tree accessor);
6170
6171  private:
6172   bool m_was_inaccessible;
6173   tree m_basetype_path;
6174   tree m_decl;
6175   tree m_diag_decl;
6176 };
6177
6178 extern void complain_about_access               (tree, tree, bool);
6179 extern bool enforce_access                      (tree, tree, tree,
6180                                                  tsubst_flags_t,
6181                                                  access_failure_info *afi = NULL);
6182 extern void push_defarg_context                 (tree);
6183 extern void pop_defarg_context                  (void);
6184 extern tree convert_default_arg                 (tree, tree, tree, int,
6185                                                  tsubst_flags_t);
6186 extern tree convert_arg_to_ellipsis             (tree, tsubst_flags_t);
6187 extern tree build_x_va_arg                      (location_t, tree, tree);
6188 extern tree cxx_type_promotes_to                (tree);
6189 extern tree type_passed_as                      (tree);
6190 extern tree convert_for_arg_passing             (tree, tree, tsubst_flags_t);
6191 extern bool is_properly_derived_from            (tree, tree);
6192 extern tree initialize_reference                (tree, tree, int,
6193                                                  tsubst_flags_t);
6194 extern tree extend_ref_init_temps               (tree, tree, vec<tree, va_gc>**);
6195 extern tree make_temporary_var_for_ref_to_temp  (tree, tree);
6196 extern bool type_has_extended_temps             (tree);
6197 extern tree strip_top_quals                     (tree);
6198 extern bool reference_related_p                 (tree, tree);
6199 extern int remaining_arguments                  (tree);
6200 extern tree perform_implicit_conversion         (tree, tree, tsubst_flags_t);
6201 extern tree perform_implicit_conversion_flags   (tree, tree, tsubst_flags_t, int);
6202 extern tree build_converted_constant_expr       (tree, tree, tsubst_flags_t);
6203 extern tree perform_direct_initialization_if_possible (tree, tree, bool,
6204                                                        tsubst_flags_t);
6205 extern tree in_charge_arg_for_name              (tree);
6206 extern tree build_cxx_call                      (tree, int, tree *,
6207                                                  tsubst_flags_t);
6208 extern bool is_std_init_list                    (tree);
6209 extern bool is_list_ctor                        (tree);
6210 extern void validate_conversion_obstack         (void);
6211 extern void mark_versions_used                  (tree);
6212 extern bool cp_warn_deprecated_use              (tree, tsubst_flags_t = tf_warning_or_error);
6213 extern tree get_function_version_dispatcher     (tree);
6214
6215 /* in class.c */
6216 extern tree build_vfield_ref                    (tree, tree);
6217 extern tree build_if_in_charge                  (tree true_stmt, tree false_stmt = void_node);
6218 extern tree build_base_path                     (enum tree_code, tree,
6219                                                  tree, int, tsubst_flags_t);
6220 extern tree convert_to_base                     (tree, tree, bool, bool,
6221                                                  tsubst_flags_t);
6222 extern tree convert_to_base_statically          (tree, tree);
6223 extern tree build_vtbl_ref                      (tree, tree);
6224 extern tree build_vfn_ref                       (tree, tree);
6225 extern tree get_vtable_decl                     (tree, int);
6226 extern bool add_method                          (tree, tree, bool);
6227 extern tree declared_access                     (tree);
6228 extern tree currently_open_class                (tree);
6229 extern tree currently_open_derived_class        (tree);
6230 extern tree outermost_open_class                (void);
6231 extern tree current_nonlambda_class_type        (void);
6232 extern tree finish_struct                       (tree, tree);
6233 extern void finish_struct_1                     (tree);
6234 extern int resolves_to_fixed_type_p             (tree, int *);
6235 extern void init_class_processing               (void);
6236 extern int is_empty_class                       (tree);
6237 extern bool is_really_empty_class               (tree);
6238 extern void pushclass                           (tree);
6239 extern void popclass                            (void);
6240 extern void push_nested_class                   (tree);
6241 extern void pop_nested_class                    (void);
6242 extern int current_lang_depth                   (void);
6243 extern void push_lang_context                   (tree);
6244 extern void pop_lang_context                    (void);
6245 extern tree instantiate_type                    (tree, tree, tsubst_flags_t);
6246 extern void build_self_reference                (void);
6247 extern int same_signature_p                     (const_tree, const_tree);
6248 extern void maybe_add_class_template_decl_list  (tree, tree, int);
6249 extern void unreverse_member_declarations       (tree);
6250 extern void invalidate_class_lookup_cache       (void);
6251 extern void maybe_note_name_used_in_class       (tree, tree);
6252 extern void note_name_declared_in_class         (tree, tree);
6253 extern tree get_vtbl_decl_for_binfo             (tree);
6254 extern bool vptr_via_virtual_p                  (tree);
6255 extern void debug_class                         (tree);
6256 extern void debug_thunks                        (tree);
6257 extern void set_linkage_according_to_type       (tree, tree);
6258 extern void determine_key_method                (tree);
6259 extern void check_for_override                  (tree, tree);
6260 extern void push_class_stack                    (void);
6261 extern void pop_class_stack                     (void);
6262 extern bool default_ctor_p                      (tree);
6263 extern bool type_has_user_nondefault_constructor (tree);
6264 extern tree in_class_defaulted_default_constructor (tree);
6265 extern bool user_provided_p                     (tree);
6266 extern bool type_has_user_provided_constructor  (tree);
6267 extern bool type_has_non_user_provided_default_constructor (tree);
6268 extern bool vbase_has_user_provided_move_assign (tree);
6269 extern tree default_init_uninitialized_part (tree);
6270 extern bool trivial_default_constructor_is_constexpr (tree);
6271 extern bool type_has_constexpr_default_constructor (tree);
6272 extern bool type_has_virtual_destructor         (tree);
6273 extern bool classtype_has_move_assign_or_move_ctor_p (tree, bool user_declared);
6274 extern bool classtype_has_non_deleted_move_ctor (tree);
6275 extern tree classtype_has_user_copy_or_dtor     (tree);
6276 extern bool type_build_ctor_call                (tree);
6277 extern bool type_build_dtor_call                (tree);
6278 extern void explain_non_literal_class           (tree);
6279 extern void inherit_targ_abi_tags               (tree);
6280 extern void defaulted_late_check                (tree);
6281 extern bool defaultable_fn_check                (tree);
6282 extern void check_abi_tags                      (tree);
6283 extern tree missing_abi_tags                    (tree);
6284 extern void fixup_type_variants                 (tree);
6285 extern void fixup_attribute_variants            (tree);
6286 extern tree* decl_cloned_function_p             (const_tree, bool);
6287 extern void clone_function_decl                 (tree, bool);
6288 extern void adjust_clone_args                   (tree);
6289 extern void deduce_noexcept_on_destructor       (tree);
6290 extern bool uniquely_derived_from_p             (tree, tree);
6291 extern bool publicly_uniquely_derived_p         (tree, tree);
6292 extern tree common_enclosing_class              (tree, tree);
6293
6294 /* in cvt.c */
6295 extern tree convert_to_reference                (tree, tree, int, int, tree,
6296                                                  tsubst_flags_t);
6297 extern tree convert_from_reference              (tree);
6298 extern tree force_rvalue                        (tree, tsubst_flags_t);
6299 extern tree ocp_convert                         (tree, tree, int, int,
6300                                                  tsubst_flags_t);
6301 extern tree cp_convert                          (tree, tree, tsubst_flags_t);
6302 extern tree cp_convert_and_check                (tree, tree, tsubst_flags_t);
6303 extern tree cp_fold_convert                     (tree, tree);
6304 extern tree cp_get_callee                       (tree);
6305 extern tree cp_get_callee_fndecl                (tree);
6306 extern tree cp_get_callee_fndecl_nofold         (tree);
6307 extern tree cp_get_fndecl_from_callee           (tree, bool fold = true);
6308 extern tree convert_to_void                     (tree, impl_conv_void,
6309                                                  tsubst_flags_t);
6310 extern tree convert_force                       (tree, tree, int,
6311                                                  tsubst_flags_t);
6312 extern tree build_expr_type_conversion          (int, tree, bool);
6313 extern tree type_promotes_to                    (tree);
6314 extern bool can_convert_qual                    (tree, tree);
6315 extern tree perform_qualification_conversions   (tree, tree);
6316 extern bool tx_safe_fn_type_p                   (tree);
6317 extern tree tx_unsafe_fn_variant                (tree);
6318 extern bool fnptr_conv_p                        (tree, tree);
6319 extern tree strip_fnptr_conv                    (tree);
6320
6321 /* in name-lookup.c */
6322 extern void maybe_push_cleanup_level            (tree);
6323 extern tree make_anon_name                      (void);
6324 extern tree maybe_push_decl                     (tree);
6325 extern tree current_decl_namespace              (void);
6326
6327 /* decl.c */
6328 extern tree poplevel                            (int, int, int);
6329 extern void cxx_init_decl_processing            (void);
6330 enum cp_tree_node_structure_enum cp_tree_node_structure
6331                                                 (union lang_tree_node *);
6332 extern void finish_scope                        (void);
6333 extern void push_switch                         (tree);
6334 extern void pop_switch                          (void);
6335 extern void note_break_stmt                     (void);
6336 extern bool note_iteration_stmt_body_start      (void);
6337 extern void note_iteration_stmt_body_end        (bool);
6338 extern void determine_local_discriminator       (tree);
6339 extern tree make_lambda_name                    (void);
6340 extern int decls_match                          (tree, tree, bool = true);
6341 extern bool maybe_version_functions             (tree, tree, bool);
6342 extern tree duplicate_decls                     (tree, tree, bool);
6343 extern tree declare_local_label                 (tree);
6344 extern tree define_label                        (location_t, tree);
6345 extern void check_goto                          (tree);
6346 extern bool check_omp_return                    (void);
6347 extern tree make_typename_type                  (tree, tree, enum tag_types, tsubst_flags_t);
6348 extern tree build_typename_type                 (tree, tree, tree, tag_types);
6349 extern tree make_unbound_class_template         (tree, tree, tree, tsubst_flags_t);
6350 extern tree build_library_fn_ptr                (const char *, tree, int);
6351 extern tree build_cp_library_fn_ptr             (const char *, tree, int);
6352 extern tree push_library_fn                     (tree, tree, tree, int);
6353 extern tree push_void_library_fn                (tree, tree, int);
6354 extern tree push_throw_library_fn               (tree, tree);
6355 extern void warn_misplaced_attr_for_class_type  (location_t location,
6356                                                  tree class_type);
6357 extern tree check_tag_decl                      (cp_decl_specifier_seq *, bool);
6358 extern tree shadow_tag                          (cp_decl_specifier_seq *);
6359 extern tree groktypename                        (cp_decl_specifier_seq *, const cp_declarator *, bool);
6360 extern tree start_decl                          (const cp_declarator *, cp_decl_specifier_seq *, int, tree, tree, tree *);
6361 extern void start_decl_1                        (tree, bool);
6362 extern bool check_array_initializer             (tree, tree, tree);
6363 extern void cp_finish_decl                      (tree, tree, bool, tree, int);
6364 extern tree lookup_decomp_type                  (tree);
6365 extern void cp_maybe_mangle_decomp              (tree, tree, unsigned int);
6366 extern void cp_finish_decomp                    (tree, tree, unsigned int);
6367 extern int cp_complete_array_type               (tree *, tree, bool);
6368 extern int cp_complete_array_type_or_error      (tree *, tree, bool, tsubst_flags_t);
6369 extern tree build_ptrmemfunc_type               (tree);
6370 extern tree build_ptrmem_type                   (tree, tree);
6371 /* the grokdeclarator prototype is in decl.h */
6372 extern tree build_this_parm                     (tree, tree, cp_cv_quals);
6373 extern tree grokparms                           (tree, tree *);
6374 extern int copy_fn_p                            (const_tree);
6375 extern bool move_fn_p                           (const_tree);
6376 extern bool move_signature_fn_p                 (const_tree);
6377 extern tree get_scope_of_declarator             (const cp_declarator *);
6378 extern void grok_special_member_properties      (tree);
6379 extern bool grok_ctor_properties                (const_tree, const_tree);
6380 extern bool grok_op_properties                  (tree, bool);
6381 extern tree xref_tag                            (enum tag_types, tree, tag_scope, bool);
6382 extern tree xref_tag_from_type                  (tree, tree, tag_scope);
6383 extern void xref_basetypes                      (tree, tree);
6384 extern tree start_enum                          (tree, tree, tree, tree, bool, bool *);
6385 extern void finish_enum_value_list              (tree);
6386 extern void finish_enum                         (tree);
6387 extern void build_enumerator                    (tree, tree, tree, tree, location_t);
6388 extern tree lookup_enumerator                   (tree, tree);
6389 extern bool start_preparsed_function            (tree, tree, int);
6390 extern bool start_function                      (cp_decl_specifier_seq *,
6391                                                  const cp_declarator *, tree);
6392 extern tree begin_function_body                 (void);
6393 extern void finish_function_body                (tree);
6394 extern tree outer_curly_brace_block             (tree);
6395 extern tree finish_function                     (bool);
6396 extern tree grokmethod                          (cp_decl_specifier_seq *, const cp_declarator *, tree);
6397 extern void maybe_register_incomplete_var       (tree);
6398 extern void maybe_commonize_var                 (tree);
6399 extern void complete_vars                       (tree);
6400 extern tree static_fn_type                      (tree);
6401 extern void revert_static_member_fn             (tree);
6402 extern void fixup_anonymous_aggr                (tree);
6403 extern tree compute_array_index_type            (tree, tree, tsubst_flags_t);
6404 extern tree check_default_argument              (tree, tree, tsubst_flags_t);
6405 extern int wrapup_namespace_globals             ();
6406 extern tree create_implicit_typedef             (tree, tree);
6407 extern int local_variable_p                     (const_tree);
6408 extern tree register_dtor_fn                    (tree);
6409 extern tmpl_spec_kind current_tmpl_spec_kind    (int);
6410 extern tree cp_fname_init                       (const char *, tree *);
6411 extern tree cxx_builtin_function                (tree decl);
6412 extern tree cxx_builtin_function_ext_scope      (tree decl);
6413 extern tree check_elaborated_type_specifier     (enum tag_types, tree, bool);
6414 extern void warn_extern_redeclared_static       (tree, tree);
6415 extern tree cxx_comdat_group                    (tree);
6416 extern bool cp_missing_noreturn_ok_p            (tree);
6417 extern bool is_direct_enum_init                 (tree, tree);
6418 extern void initialize_artificial_var           (tree, vec<constructor_elt, va_gc> *);
6419 extern tree check_var_type                      (tree, tree);
6420 extern tree reshape_init                        (tree, tree, tsubst_flags_t);
6421 extern tree next_initializable_field (tree);
6422 extern tree fndecl_declared_return_type         (tree);
6423 extern bool undeduced_auto_decl                 (tree);
6424 extern bool require_deduced_type                (tree, tsubst_flags_t = tf_warning_or_error);
6425
6426 extern tree finish_case_label                   (location_t, tree, tree);
6427 extern tree cxx_maybe_build_cleanup             (tree, tsubst_flags_t);
6428 extern bool check_array_designated_initializer  (constructor_elt *,
6429                                                  unsigned HOST_WIDE_INT);
6430 extern bool check_for_uninitialized_const_var   (tree, bool, tsubst_flags_t);
6431 extern tree build_explicit_specifier            (tree, tsubst_flags_t);
6432
6433 /* in decl2.c */
6434 extern void record_mangling                     (tree, bool);
6435 extern void overwrite_mangling                  (tree, tree);
6436 extern void note_mangling_alias                 (tree, tree);
6437 extern void generate_mangling_aliases           (void);
6438 extern tree build_memfn_type                    (tree, tree, cp_cv_quals, cp_ref_qualifier);
6439 extern tree build_pointer_ptrmemfn_type (tree);
6440 extern tree change_return_type                  (tree, tree);
6441 extern void maybe_retrofit_in_chrg              (tree);
6442 extern void maybe_make_one_only                 (tree);
6443 extern bool vague_linkage_p                     (tree);
6444 extern void grokclassfn                         (tree, tree,
6445                                                  enum overload_flags);
6446 extern tree grok_array_decl                     (location_t, tree, tree, bool);
6447 extern tree delete_sanity                       (tree, tree, bool, int, tsubst_flags_t);
6448 extern tree check_classfn                       (tree, tree, tree);
6449 extern void check_member_template               (tree);
6450 extern tree grokfield (const cp_declarator *, cp_decl_specifier_seq *,
6451                        tree, bool, tree, tree);
6452 extern tree grokbitfield (const cp_declarator *, cp_decl_specifier_seq *,
6453                           tree, tree, tree);
6454 extern bool any_dependent_type_attributes_p     (tree);
6455 extern tree cp_reconstruct_complex_type         (tree, tree);
6456 extern bool attributes_naming_typedef_ok        (tree);
6457 extern void cplus_decl_attributes               (tree *, tree, int);
6458 extern void finish_anon_union                   (tree);
6459 extern void cxx_post_compilation_parsing_cleanups (void);
6460 extern tree coerce_new_type                     (tree, location_t);
6461 extern void coerce_delete_type                  (tree, location_t);
6462 extern void comdat_linkage                      (tree);
6463 extern void determine_visibility                (tree);
6464 extern void constrain_class_visibility          (tree);
6465 extern void reset_type_linkage                  (tree);
6466 extern void tentative_decl_linkage              (tree);
6467 extern void import_export_decl                  (tree);
6468 extern tree build_cleanup                       (tree);
6469 extern tree build_offset_ref_call_from_tree     (tree, vec<tree, va_gc> **,
6470                                                  tsubst_flags_t);
6471 extern bool decl_defined_p                      (tree);
6472 extern bool decl_constant_var_p                 (tree);
6473 extern bool decl_maybe_constant_var_p           (tree);
6474 extern void no_linkage_error                    (tree);
6475 extern void check_default_args                  (tree);
6476 extern bool mark_used                           (tree);
6477 extern bool mark_used                           (tree, tsubst_flags_t);
6478 extern void finish_static_data_member_decl      (tree, tree, bool, tree, int);
6479 extern tree cp_build_parm_decl                  (tree, tree, tree);
6480 extern tree get_guard                           (tree);
6481 extern tree get_guard_cond                      (tree, bool);
6482 extern tree set_guard                           (tree);
6483 extern tree get_tls_wrapper_fn                  (tree);
6484 extern void mark_needed                         (tree);
6485 extern bool decl_needed_p                       (tree);
6486 extern void note_vague_linkage_fn               (tree);
6487 extern void note_variable_template_instantiation (tree);
6488 extern tree build_artificial_parm               (tree, tree, tree);
6489 extern bool possibly_inlined_p                  (tree);
6490 extern int parm_index                           (tree);
6491 extern tree vtv_start_verification_constructor_init_function (void);
6492 extern tree vtv_finish_verification_constructor_init_function (tree);
6493 extern bool cp_omp_mappable_type                (tree);
6494 extern void cp_check_const_attributes (tree);
6495
6496 /* in error.c */
6497 extern const char *type_as_string               (tree, int);
6498 extern const char *type_as_string_translate     (tree, int);
6499 extern const char *decl_as_string               (tree, int);
6500 extern const char *decl_as_string_translate     (tree, int);
6501 extern const char *decl_as_dwarf_string         (tree, int);
6502 extern const char *expr_as_string               (tree, int);
6503 extern const char *expr_to_string               (tree);
6504 extern const char *lang_decl_name               (tree, int, bool);
6505 extern const char *lang_decl_dwarf_name         (tree, int, bool);
6506 extern const char *language_to_string           (enum languages);
6507 extern const char *class_key_or_enum_as_string  (tree);
6508 extern void maybe_warn_variadic_templates       (void);
6509 extern void maybe_warn_cpp0x                    (cpp0x_warn_str str);
6510 extern bool pedwarn_cxx98                       (location_t, int, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
6511 extern location_t location_of                   (tree);
6512 extern void qualified_name_lookup_error         (tree, tree, tree,
6513                                                  location_t);
6514
6515 /* in except.c */
6516 extern void init_exception_processing           (void);
6517 extern tree expand_start_catch_block            (tree);
6518 extern void expand_end_catch_block              (void);
6519 extern tree build_exc_ptr                       (void);
6520 extern tree build_throw                         (tree);
6521 extern int nothrow_libfn_p                      (const_tree);
6522 extern void check_handlers                      (tree);
6523 extern tree finish_noexcept_expr                (tree, tsubst_flags_t);
6524 extern bool expr_noexcept_p                     (tree, tsubst_flags_t);
6525 extern void perform_deferred_noexcept_checks    (void);
6526 extern bool nothrow_spec_p                      (const_tree);
6527 extern bool type_noexcept_p                     (const_tree);
6528 extern bool type_throw_all_p                    (const_tree);
6529 extern tree build_noexcept_spec                 (tree, tsubst_flags_t);
6530 extern void choose_personality_routine          (enum languages);
6531 extern tree build_must_not_throw_expr           (tree,tree);
6532 extern tree eh_type_info                        (tree);
6533 extern tree begin_eh_spec_block                 (void);
6534 extern void finish_eh_spec_block                (tree, tree);
6535 extern tree build_eh_type_type                  (tree);
6536 extern tree cp_protect_cleanup_actions          (void);
6537 extern tree create_try_catch_expr               (tree, tree);
6538
6539 /* in expr.c */
6540 extern tree cplus_expand_constant               (tree);
6541 extern tree mark_use (tree expr, bool rvalue_p, bool read_p,
6542                       location_t = UNKNOWN_LOCATION,
6543                       bool reject_builtin = true);
6544 extern tree mark_rvalue_use                     (tree,
6545                                                  location_t = UNKNOWN_LOCATION,
6546                                                  bool reject_builtin = true);
6547 extern tree mark_lvalue_use                     (tree);
6548 extern tree mark_lvalue_use_nonread             (tree);
6549 extern tree mark_type_use                       (tree);
6550 extern tree mark_discarded_use                  (tree);
6551 extern void mark_exp_read                       (tree);
6552
6553 /* friend.c */
6554 extern int is_friend                            (tree, tree);
6555 extern void make_friend_class                   (tree, tree, bool);
6556 extern void add_friend                          (tree, tree, bool);
6557 extern tree do_friend                           (tree, tree, tree, tree,
6558                                                  enum overload_flags, bool);
6559
6560 extern void set_global_friend                   (tree);
6561 extern bool is_global_friend                    (tree);
6562
6563 /* in init.c */
6564 extern tree expand_member_init                  (tree);
6565 extern void emit_mem_initializers               (tree);
6566 extern tree build_aggr_init                     (tree, tree, int,
6567                                                  tsubst_flags_t);
6568 extern int is_class_type                        (tree, int);
6569 extern tree get_type_value                      (tree);
6570 extern tree build_zero_init                     (tree, tree, bool);
6571 extern tree build_value_init                    (tree, tsubst_flags_t);
6572 extern tree build_value_init_noctor             (tree, tsubst_flags_t);
6573 extern tree get_nsdmi                           (tree, bool, tsubst_flags_t);
6574 extern tree build_offset_ref                    (tree, tree, bool,
6575                                                  tsubst_flags_t);
6576 extern tree throw_bad_array_new_length          (void);
6577 extern bool type_has_new_extended_alignment     (tree);
6578 extern unsigned malloc_alignment                (void);
6579 extern tree build_new                           (vec<tree, va_gc> **, tree, tree,
6580                                                  vec<tree, va_gc> **, int,
6581                                                  tsubst_flags_t);
6582 extern tree get_temp_regvar                     (tree, tree);
6583 extern tree build_vec_init                      (tree, tree, tree, bool, int,
6584                                                  tsubst_flags_t);
6585 extern tree build_delete                        (tree, tree,
6586                                                  special_function_kind,
6587                                                  int, int, tsubst_flags_t);
6588 extern void push_base_cleanups                  (void);
6589 extern tree build_vec_delete                    (tree, tree,
6590                                                  special_function_kind, int,
6591                                                  tsubst_flags_t);
6592 extern tree create_temporary_var                (tree);
6593 extern void initialize_vtbl_ptrs                (tree);
6594 extern tree scalar_constant_value               (tree);
6595 extern tree decl_really_constant_value          (tree);
6596 extern int diagnose_uninitialized_cst_or_ref_member (tree, bool, bool);
6597 extern tree build_vtbl_address                  (tree);
6598 extern bool maybe_reject_flexarray_init         (tree, tree);
6599
6600 /* in lex.c */
6601 extern void cxx_dup_lang_specific_decl          (tree);
6602 extern void yyungetc                            (int, int);
6603
6604 extern tree unqualified_name_lookup_error       (tree,
6605                                                  location_t = UNKNOWN_LOCATION);
6606 extern tree unqualified_fn_lookup_error         (cp_expr);
6607 extern tree make_conv_op_name                   (tree);
6608 extern tree build_lang_decl                     (enum tree_code, tree, tree);
6609 extern tree build_lang_decl_loc                 (location_t, enum tree_code, tree, tree);
6610 extern void retrofit_lang_decl                  (tree);
6611 extern void fit_decomposition_lang_decl         (tree, tree);
6612 extern tree copy_decl                           (tree CXX_MEM_STAT_INFO);
6613 extern tree copy_type                           (tree CXX_MEM_STAT_INFO);
6614 extern tree cxx_make_type                       (enum tree_code CXX_MEM_STAT_INFO);
6615 extern tree make_class_type                     (enum tree_code CXX_MEM_STAT_INFO);
6616 extern const char *get_identifier_kind_name     (tree);
6617 extern void set_identifier_kind                 (tree, cp_identifier_kind);
6618 extern bool cxx_init                            (void);
6619 extern void cxx_finish                          (void);
6620 extern bool in_main_input_context               (void);
6621
6622 /* in method.c */
6623 extern void init_method                         (void);
6624 extern tree make_thunk                          (tree, bool, tree, tree);
6625 extern void finish_thunk                        (tree);
6626 extern void use_thunk                           (tree, bool);
6627 extern bool trivial_fn_p                        (tree);
6628 extern tree forward_parm                        (tree);
6629 extern bool is_trivially_xible                  (enum tree_code, tree, tree);
6630 extern bool is_xible                            (enum tree_code, tree, tree);
6631 extern tree get_defaulted_eh_spec               (tree, tsubst_flags_t = tf_warning_or_error);
6632 extern void after_nsdmi_defaulted_late_checks   (tree);
6633 extern bool maybe_explain_implicit_delete       (tree);
6634 extern void explain_implicit_non_constexpr      (tree);
6635 extern void deduce_inheriting_ctor              (tree);
6636 extern void synthesize_method                   (tree);
6637 extern tree lazily_declare_fn                   (special_function_kind,
6638                                                  tree);
6639 extern tree skip_artificial_parms_for           (const_tree, tree);
6640 extern int num_artificial_parms_for             (const_tree);
6641 extern tree make_alias_for                      (tree, tree);
6642 extern tree get_copy_ctor                       (tree, tsubst_flags_t);
6643 extern tree get_copy_assign                     (tree);
6644 extern tree get_default_ctor                    (tree);
6645 extern tree get_dtor                            (tree, tsubst_flags_t);
6646 extern tree strip_inheriting_ctors              (tree);
6647 extern tree inherited_ctor_binfo                (tree);
6648 extern bool ctor_omit_inherited_parms           (tree);
6649 extern tree locate_ctor                         (tree);
6650 extern tree implicitly_declare_fn               (special_function_kind, tree,
6651                                                  bool, tree, tree);
6652
6653 /* In optimize.c */
6654 extern bool maybe_clone_body                    (tree);
6655
6656 /* In parser.c */
6657 extern tree cp_convert_range_for (tree, tree, tree, tree, unsigned int, bool,
6658                                   unsigned short);
6659 extern void cp_convert_omp_range_for (tree &, vec<tree, va_gc> *, tree &,
6660                                       tree &, tree &, tree &, tree &, tree &);
6661 extern void cp_finish_omp_range_for (tree, tree);
6662 extern bool parsing_nsdmi (void);
6663 extern bool parsing_default_capturing_generic_lambda_in_template (void);
6664 extern void inject_this_parameter (tree, cp_cv_quals);
6665 extern location_t defarg_location (tree);
6666 extern void maybe_show_extern_c_location (void);
6667 extern bool literal_integer_zerop (const_tree);
6668
6669 /* in pt.c */
6670 extern bool check_template_shadow               (tree);
6671 extern bool check_auto_in_tmpl_args             (tree, tree);
6672 extern tree get_innermost_template_args         (tree, int);
6673 extern void maybe_begin_member_template_processing (tree);
6674 extern void maybe_end_member_template_processing (void);
6675 extern tree finish_member_template_decl         (tree);
6676 extern void begin_template_parm_list            (void);
6677 extern bool begin_specialization                (void);
6678 extern void reset_specialization                (void);
6679 extern void end_specialization                  (void);
6680 extern void begin_explicit_instantiation        (void);
6681 extern void end_explicit_instantiation          (void);
6682 extern void check_unqualified_spec_or_inst      (tree, location_t);
6683 extern tree check_explicit_specialization       (tree, tree, int, int,
6684                                                  tree = NULL_TREE);
6685 extern int num_template_headers_for_class       (tree);
6686 extern void check_template_variable             (tree);
6687 extern tree make_auto                           (void);
6688 extern tree make_decltype_auto                  (void);
6689 extern tree make_template_placeholder           (tree);
6690 extern bool template_placeholder_p              (tree);
6691 extern tree do_auto_deduction                   (tree, tree, tree,
6692                                                  tsubst_flags_t
6693                                                  = tf_warning_or_error,
6694                                                  auto_deduction_context
6695                                                  = adc_unspecified,
6696                                                  tree = NULL_TREE,
6697                                                  int = LOOKUP_NORMAL);
6698 extern tree type_uses_auto                      (tree);
6699 extern tree type_uses_auto_or_concept           (tree);
6700 extern void append_type_to_template_for_access_check (tree, tree, tree,
6701                                                       location_t);
6702 extern tree convert_generic_types_to_packs      (tree, int, int);
6703 extern tree splice_late_return_type             (tree, tree);
6704 extern bool is_auto                             (const_tree);
6705 extern tree process_template_parm               (tree, location_t, tree,
6706                                                  bool, bool);
6707 extern tree end_template_parm_list              (tree);
6708 extern void end_template_parm_list              (void);
6709 extern void end_template_decl                   (void);
6710 extern tree maybe_update_decl_type              (tree, tree);
6711 extern bool check_default_tmpl_args             (tree, tree, bool, bool, int);
6712 extern tree push_template_decl                  (tree);
6713 extern tree push_template_decl_real             (tree, bool);
6714 extern tree add_inherited_template_parms        (tree, tree);
6715 extern bool redeclare_class_template            (tree, tree, tree);
6716 extern tree lookup_template_class               (tree, tree, tree, tree,
6717                                                  int, tsubst_flags_t);
6718 extern tree lookup_template_function            (tree, tree);
6719 extern tree lookup_template_variable            (tree, tree);
6720 extern int uses_template_parms                  (tree);
6721 extern bool uses_template_parms_level           (tree, int);
6722 extern bool in_template_function                (void);
6723 extern bool need_generic_capture                (void);
6724 extern tree instantiate_class_template          (tree);
6725 extern tree instantiate_template                (tree, tree, tsubst_flags_t);
6726 extern tree fn_type_unification                 (tree, tree, tree,
6727                                                  const tree *, unsigned int,
6728                                                  tree, unification_kind_t, int,
6729                                                  struct conversion **,
6730                                                  bool, bool);
6731 extern void mark_decl_instantiated              (tree, int);
6732 extern int more_specialized_fn                  (tree, tree, int);
6733 extern void do_decl_instantiation               (tree, tree);
6734 extern void do_type_instantiation               (tree, tree, tsubst_flags_t);
6735 extern bool always_instantiate_p                (tree);
6736 extern bool maybe_instantiate_noexcept          (tree, tsubst_flags_t = tf_warning_or_error);
6737 extern tree instantiate_decl                    (tree, bool, bool);
6738 extern int comp_template_parms                  (const_tree, const_tree);
6739 extern bool builtin_pack_fn_p                   (tree);
6740 extern bool uses_parameter_packs                (tree);
6741 extern bool template_parameter_pack_p           (const_tree);
6742 extern bool function_parameter_pack_p           (const_tree);
6743 extern bool function_parameter_expanded_from_pack_p (tree, tree);
6744 extern tree make_pack_expansion                 (tree, tsubst_flags_t = tf_warning_or_error);
6745 extern bool check_for_bare_parameter_packs      (tree, location_t = UNKNOWN_LOCATION);
6746 extern tree build_template_info                 (tree, tree);
6747 extern tree get_template_info                   (const_tree);
6748 extern vec<qualified_typedef_usage_t, va_gc> *get_types_needing_access_check (tree);
6749 extern int template_class_depth                 (tree);
6750 extern int is_specialization_of                 (tree, tree);
6751 extern bool is_specialization_of_friend         (tree, tree);
6752 extern tree get_pattern_parm                    (tree, tree);
6753 extern int comp_template_args                   (tree, tree, tree * = NULL,
6754                                                  tree * = NULL, bool = false);
6755 extern int template_args_equal                  (tree, tree, bool = false);
6756 extern tree maybe_process_partial_specialization (tree);
6757 extern tree most_specialized_instantiation      (tree);
6758 extern void print_candidates                    (tree);
6759 extern void instantiate_pending_templates       (int);
6760 extern tree tsubst_default_argument             (tree, int, tree, tree,
6761                                                  tsubst_flags_t);
6762 extern tree tsubst (tree, tree, tsubst_flags_t, tree);
6763 extern tree tsubst_copy_and_build               (tree, tree, tsubst_flags_t,
6764                                                  tree, bool, bool);
6765 extern tree tsubst_expr                         (tree, tree, tsubst_flags_t,
6766                                                  tree, bool);
6767 extern tree tsubst_pack_expansion               (tree, tree, tsubst_flags_t, tree);
6768 extern tree most_general_template               (tree);
6769 extern tree get_mostly_instantiated_function_type (tree);
6770 extern bool problematic_instantiation_changed   (void);
6771 extern void record_last_problematic_instantiation (void);
6772 extern struct tinst_level *current_instantiation(void);
6773 extern bool instantiating_current_function_p    (void);
6774 extern tree maybe_get_template_decl_from_type_decl (tree);
6775 extern int processing_template_parmlist;
6776 extern bool dependent_type_p                    (tree);
6777 extern bool dependent_scope_p                   (tree);
6778 extern bool any_dependent_template_arguments_p  (const_tree);
6779 extern bool any_erroneous_template_args_p       (const_tree);
6780 extern bool dependent_template_p                (tree);
6781 extern bool dependent_template_id_p             (tree, tree);
6782 extern bool type_dependent_expression_p         (tree);
6783 extern bool type_dependent_object_expression_p  (tree);
6784 extern bool any_type_dependent_arguments_p      (const vec<tree, va_gc> *);
6785 extern bool any_type_dependent_elements_p       (const_tree);
6786 extern bool type_dependent_expression_p_push    (tree);
6787 extern bool value_dependent_expression_p        (tree);
6788 extern bool instantiation_dependent_expression_p (tree);
6789 extern bool instantiation_dependent_uneval_expression_p (tree);
6790 extern bool any_value_dependent_elements_p      (const_tree);
6791 extern bool dependent_omp_for_p                 (tree, tree, tree, tree);
6792 extern tree resolve_typename_type               (tree, bool);
6793 extern tree template_for_substitution           (tree);
6794 extern tree build_non_dependent_expr            (tree);
6795 extern void make_args_non_dependent             (vec<tree, va_gc> *);
6796 extern bool reregister_specialization           (tree, tree, tree);
6797 extern tree instantiate_non_dependent_expr      (tree);
6798 extern tree instantiate_non_dependent_expr_sfinae (tree, tsubst_flags_t);
6799 extern tree instantiate_non_dependent_expr_internal (tree, tsubst_flags_t);
6800 extern tree instantiate_non_dependent_or_null   (tree);
6801 extern bool variable_template_specialization_p  (tree);
6802 extern bool alias_type_or_template_p            (tree);
6803 extern bool alias_template_specialization_p     (const_tree);
6804 extern bool dependent_alias_template_spec_p     (const_tree);
6805 extern bool template_parm_object_p              (const_tree);
6806 extern bool explicit_class_specialization_p     (tree);
6807 extern bool push_tinst_level                    (tree);
6808 extern bool push_tinst_level_loc                (tree, location_t);
6809 extern void pop_tinst_level                     (void);
6810 extern struct tinst_level *outermost_tinst_level(void);
6811 extern void init_template_processing            (void);
6812 extern void print_template_statistics           (void);
6813 bool template_template_parameter_p              (const_tree);
6814 bool template_type_parameter_p                  (const_tree);
6815 extern bool primary_template_specialization_p   (const_tree);
6816 extern tree get_primary_template_innermost_parameters   (const_tree);
6817 extern tree get_template_parms_at_level (tree, int);
6818 extern tree get_template_innermost_arguments    (const_tree);
6819 extern tree get_template_argument_pack_elems    (const_tree);
6820 extern tree get_function_template_decl          (const_tree);
6821 extern tree resolve_nondeduced_context          (tree, tsubst_flags_t);
6822 extern hashval_t iterative_hash_template_arg (tree arg, hashval_t val);
6823 extern tree coerce_template_parms               (tree, tree, tree);
6824 extern tree coerce_template_parms               (tree, tree, tree, tsubst_flags_t);
6825 extern void register_local_specialization       (tree, tree);
6826 extern tree retrieve_local_specialization       (tree);
6827 extern tree extract_fnparm_pack                 (tree, tree *);
6828 extern tree template_parm_to_arg                (tree);
6829 extern tree dguide_name                         (tree);
6830 extern bool dguide_name_p                       (tree);
6831 extern bool deduction_guide_p                   (const_tree);
6832 extern bool copy_guide_p                        (const_tree);
6833 extern bool template_guide_p                    (const_tree);
6834 extern void store_explicit_specifier            (tree, tree);
6835
6836 /* in repo.c */
6837 extern void init_repo                           (void);
6838 extern int repo_emit_p                          (tree);
6839 extern bool repo_export_class_p                 (const_tree);
6840 extern void finish_repo                         (void);
6841
6842 /* in rtti.c */
6843 /* A vector of all tinfo decls that haven't been emitted yet.  */
6844 extern GTY(()) vec<tree, va_gc> *unemitted_tinfo_decls;
6845
6846 extern void init_rtti_processing                (void);
6847 extern tree build_typeid                        (tree, tsubst_flags_t);
6848 extern tree get_tinfo_decl                      (tree);
6849 extern tree get_typeid                          (tree, tsubst_flags_t);
6850 extern tree build_headof                        (tree);
6851 extern tree build_dynamic_cast                  (tree, tree, tsubst_flags_t);
6852 extern void emit_support_tinfos                 (void);
6853 extern bool emit_tinfo_decl                     (tree);
6854
6855 /* in search.c */
6856 extern bool accessible_base_p                   (tree, tree, bool);
6857 extern tree lookup_base                         (tree, tree, base_access,
6858                                                  base_kind *, tsubst_flags_t);
6859 extern tree dcast_base_hint                     (tree, tree);
6860 extern int accessible_p                         (tree, tree, bool);
6861 extern int accessible_in_template_p             (tree, tree);
6862 extern tree lookup_field                        (tree, tree, int, bool);
6863 extern tree lookup_fnfields                     (tree, tree, int);
6864 extern tree lookup_member                       (tree, tree, int, bool,
6865                                                  tsubst_flags_t,
6866                                                  access_failure_info *afi = NULL);
6867 extern tree lookup_member_fuzzy         (tree, tree, bool);
6868 extern tree locate_field_accessor               (tree, tree, bool);
6869 extern int look_for_overrides                   (tree, tree);
6870 extern void get_pure_virtuals                   (tree);
6871 extern void maybe_suppress_debug_info           (tree);
6872 extern void note_debug_info_needed              (tree);
6873 extern tree current_scope                       (void);
6874 extern int at_function_scope_p                  (void);
6875 extern bool at_class_scope_p                    (void);
6876 extern bool at_namespace_scope_p                (void);
6877 extern tree context_for_name_lookup             (tree);
6878 extern tree lookup_conversions                  (tree);
6879 extern tree binfo_from_vbase                    (tree);
6880 extern tree binfo_for_vbase                     (tree, tree);
6881 extern tree look_for_overrides_here             (tree, tree);
6882 #define dfs_skip_bases ((tree)1)
6883 extern tree dfs_walk_all (tree, tree (*) (tree, void *),
6884                           tree (*) (tree, void *), void *);
6885 extern tree dfs_walk_once (tree, tree (*) (tree, void *),
6886                            tree (*) (tree, void *), void *);
6887 extern tree binfo_via_virtual                   (tree, tree);
6888 extern bool binfo_direct_p                      (tree);
6889 extern tree build_baselink                      (tree, tree, tree, tree);
6890 extern tree adjust_result_of_qualified_name_lookup
6891                                                 (tree, tree, tree);
6892 extern tree copied_binfo                        (tree, tree);
6893 extern tree original_binfo                      (tree, tree);
6894 extern int shared_member_p                      (tree);
6895 extern bool any_dependent_bases_p (tree = current_nonlambda_class_type ());
6896
6897 /* The representation of a deferred access check.  */
6898
6899 struct GTY(()) deferred_access_check {
6900   /* The base class in which the declaration is referenced. */
6901   tree binfo;
6902   /* The declaration whose access must be checked.  */
6903   tree decl;
6904   /* The declaration that should be used in the error message.  */
6905   tree diag_decl;
6906   /* The location of this access.  */
6907   location_t loc;
6908 };
6909
6910 /* in semantics.c */
6911 extern void push_deferring_access_checks        (deferring_kind);
6912 extern void resume_deferring_access_checks      (void);
6913 extern void stop_deferring_access_checks        (void);
6914 extern void pop_deferring_access_checks         (void);
6915 extern vec<deferred_access_check, va_gc> *get_deferred_access_checks (void);
6916 extern void reopen_deferring_access_checks (vec<deferred_access_check, va_gc> *);
6917 extern void pop_to_parent_deferring_access_checks (void);
6918 extern bool perform_access_checks (vec<deferred_access_check, va_gc> *,
6919                                    tsubst_flags_t);
6920 extern bool perform_deferred_access_checks      (tsubst_flags_t);
6921 extern bool perform_or_defer_access_check       (tree, tree, tree,
6922                                                  tsubst_flags_t,
6923                                                  access_failure_info *afi = NULL);
6924
6925 /* RAII sentinel to ensures that deferred access checks are popped before
6926   a function returns.  */
6927
6928 struct deferring_access_check_sentinel
6929 {
6930   deferring_access_check_sentinel (enum deferring_kind kind = dk_deferred)
6931   {
6932     push_deferring_access_checks (kind);
6933   }
6934   ~deferring_access_check_sentinel ()
6935   {
6936     pop_deferring_access_checks ();
6937   }
6938 };
6939
6940 extern int stmts_are_full_exprs_p               (void);
6941 extern void init_cp_semantics                   (void);
6942 extern tree do_poplevel                         (tree);
6943 extern void break_maybe_infinite_loop           (void);
6944 extern void add_decl_expr                       (tree);
6945 extern tree maybe_cleanup_point_expr_void       (tree);
6946 extern tree finish_expr_stmt                    (tree);
6947 extern tree begin_if_stmt                       (void);
6948 extern tree finish_if_stmt_cond                 (tree, tree);
6949 extern tree finish_then_clause                  (tree);
6950 extern void begin_else_clause                   (tree);
6951 extern void finish_else_clause                  (tree);
6952 extern void finish_if_stmt                      (tree);
6953 extern tree begin_while_stmt                    (void);
6954 extern void finish_while_stmt_cond      (tree, tree, bool, unsigned short);
6955 extern void finish_while_stmt                   (tree);
6956 extern tree begin_do_stmt                       (void);
6957 extern void finish_do_body                      (tree);
6958 extern void finish_do_stmt              (tree, tree, bool, unsigned short);
6959 extern tree finish_return_stmt                  (tree);
6960 extern tree begin_for_scope                     (tree *);
6961 extern tree begin_for_stmt                      (tree, tree);
6962 extern void finish_init_stmt                    (tree);
6963 extern void finish_for_cond             (tree, tree, bool, unsigned short);
6964 extern void finish_for_expr                     (tree, tree);
6965 extern void finish_for_stmt                     (tree);
6966 extern tree begin_range_for_stmt                (tree, tree);
6967 extern void finish_range_for_decl               (tree, tree, tree);
6968 extern void finish_range_for_stmt               (tree);
6969 extern tree finish_break_stmt                   (void);
6970 extern tree finish_continue_stmt                (void);
6971 extern tree begin_switch_stmt                   (void);
6972 extern void finish_switch_cond                  (tree, tree);
6973 extern void finish_switch_stmt                  (tree);
6974 extern tree finish_goto_stmt                    (tree);
6975 extern tree begin_try_block                     (void);
6976 extern void finish_try_block                    (tree);
6977 extern void finish_handler_sequence             (tree);
6978 extern tree begin_function_try_block            (tree *);
6979 extern void finish_function_try_block           (tree);
6980 extern void finish_function_handler_sequence    (tree, tree);
6981 extern void finish_cleanup_try_block            (tree);
6982 extern tree begin_handler                       (void);
6983 extern void finish_handler_parms                (tree, tree);
6984 extern void finish_handler                      (tree);
6985 extern void finish_cleanup                      (tree, tree);
6986 extern bool is_this_parameter                   (tree);
6987
6988 enum {
6989   BCS_NORMAL = 0,
6990   BCS_NO_SCOPE = 1,
6991   BCS_TRY_BLOCK = 2,
6992   BCS_FN_BODY = 4,
6993   BCS_TRANSACTION = 8
6994 };
6995 extern tree begin_compound_stmt                 (unsigned int);
6996
6997 extern void finish_compound_stmt                (tree);
6998 extern tree finish_asm_stmt                     (int, tree, tree, tree, tree,
6999                                                  tree);
7000 extern tree finish_label_stmt                   (tree);
7001 extern void finish_label_decl                   (tree);
7002 extern cp_expr finish_parenthesized_expr        (cp_expr);
7003 extern tree force_paren_expr                    (tree);
7004 extern tree maybe_undo_parenthesized_ref        (tree);
7005 extern tree maybe_strip_ref_conversion          (tree);
7006 extern tree finish_non_static_data_member       (tree, tree, tree);
7007 extern tree begin_stmt_expr                     (void);
7008 extern tree finish_stmt_expr_expr               (tree, tree);
7009 extern tree finish_stmt_expr                    (tree, bool);
7010 extern tree stmt_expr_value_expr                (tree);
7011 bool empty_expr_stmt_p                          (tree);
7012 extern cp_expr perform_koenig_lookup            (cp_expr, vec<tree, va_gc> *,
7013                                                  tsubst_flags_t);
7014 extern tree finish_call_expr                    (tree, vec<tree, va_gc> **, bool,
7015                                                  bool, tsubst_flags_t);
7016 extern tree lookup_and_finish_template_variable (tree, tree, tsubst_flags_t = tf_warning_or_error);
7017 extern tree finish_template_variable            (tree, tsubst_flags_t = tf_warning_or_error);
7018 extern cp_expr finish_increment_expr            (cp_expr, enum tree_code);
7019 extern tree finish_this_expr                    (void);
7020 extern tree finish_pseudo_destructor_expr       (tree, tree, tree, location_t);
7021 extern cp_expr finish_unary_op_expr             (location_t, enum tree_code, cp_expr,
7022                                                  tsubst_flags_t);
7023 /* Whether this call to finish_compound_literal represents a C++11 functional
7024    cast or a C99 compound literal.  */
7025 enum fcl_t { fcl_functional, fcl_c99 };
7026 extern tree finish_compound_literal             (tree, tree, tsubst_flags_t, fcl_t = fcl_functional);
7027 extern tree finish_fname                        (tree);
7028 extern void finish_translation_unit             (void);
7029 extern tree finish_template_type_parm           (tree, tree);
7030 extern tree finish_template_template_parm       (tree, tree);
7031 extern tree begin_class_definition              (tree);
7032 extern void finish_template_decl                (tree);
7033 extern tree finish_template_type                (tree, tree, int);
7034 extern tree finish_base_specifier               (tree, tree, bool);
7035 extern void finish_member_declaration           (tree);
7036 extern bool outer_automatic_var_p               (tree);
7037 extern tree process_outer_var_ref               (tree, tsubst_flags_t, bool force_use = false);
7038 extern cp_expr finish_id_expression             (tree, tree, tree,
7039                                                  cp_id_kind *,
7040                                                  bool, bool, bool *,
7041                                                  bool, bool, bool, bool,
7042                                                  const char **,
7043                                                  location_t);
7044 extern tree finish_typeof                       (tree);
7045 extern tree finish_underlying_type              (tree);
7046 extern tree calculate_bases                     (tree, tsubst_flags_t);
7047 extern tree finish_bases                        (tree, bool);
7048 extern tree calculate_direct_bases              (tree, tsubst_flags_t);
7049 extern tree finish_offsetof                     (tree, tree, location_t);
7050 extern void finish_decl_cleanup                 (tree, tree);
7051 extern void finish_eh_cleanup                   (tree);
7052 extern void emit_associated_thunks              (tree);
7053 extern void finish_mem_initializers             (tree);
7054 extern tree check_template_template_default_arg (tree);
7055 extern bool expand_or_defer_fn_1                (tree);
7056 extern void expand_or_defer_fn                  (tree);
7057 extern void add_typedef_to_current_template_for_access_check (tree, tree,
7058                                                               location_t);
7059 extern void check_accessibility_of_qualified_id (tree, tree, tree);
7060 extern tree finish_qualified_id_expr            (tree, tree, bool, bool,
7061                                                  bool, bool, tsubst_flags_t);
7062 extern void simplify_aggr_init_expr             (tree *);
7063 extern void finalize_nrv                        (tree *, tree, tree);
7064 extern tree omp_reduction_id                    (enum tree_code, tree, tree);
7065 extern tree cp_remove_omp_priv_cleanup_stmt     (tree *, int *, void *);
7066 extern void cp_check_omp_declare_reduction      (tree);
7067 extern void finish_omp_declare_simd_methods     (tree);
7068 extern tree finish_omp_clauses                  (tree, enum c_omp_region_type);
7069 extern tree push_omp_privatization_clauses      (bool);
7070 extern void pop_omp_privatization_clauses       (tree);
7071 extern void save_omp_privatization_clauses      (vec<tree> &);
7072 extern void restore_omp_privatization_clauses   (vec<tree> &);
7073 extern void finish_omp_threadprivate            (tree);
7074 extern tree begin_omp_structured_block          (void);
7075 extern tree finish_omp_structured_block         (tree);
7076 extern tree finish_oacc_data                    (tree, tree);
7077 extern tree finish_oacc_host_data               (tree, tree);
7078 extern tree finish_omp_construct                (enum tree_code, tree, tree);
7079 extern tree begin_omp_parallel                  (void);
7080 extern tree finish_omp_parallel                 (tree, tree);
7081 extern tree begin_omp_task                      (void);
7082 extern tree finish_omp_task                     (tree, tree);
7083 extern tree finish_omp_for                      (location_t, enum tree_code,
7084                                                  tree, tree, tree, tree, tree,
7085                                                  tree, tree, vec<tree> *, tree);
7086 extern tree finish_omp_for_block                (tree, tree);
7087 extern void finish_omp_atomic                   (location_t, enum tree_code,
7088                                                  enum tree_code, tree, tree,
7089                                                  tree, tree, tree, tree,
7090                                                  enum omp_memory_order);
7091 extern void finish_omp_barrier                  (void);
7092 extern void finish_omp_depobj                   (location_t, tree,
7093                                                  enum omp_clause_depend_kind,
7094                                                  tree);
7095 extern void finish_omp_flush                    (int);
7096 extern void finish_omp_taskwait                 (void);
7097 extern void finish_omp_taskyield                (void);
7098 extern void finish_omp_cancel                   (tree);
7099 extern void finish_omp_cancellation_point       (tree);
7100 extern tree omp_privatize_field                 (tree, bool);
7101 extern tree begin_transaction_stmt              (location_t, tree *, int);
7102 extern void finish_transaction_stmt             (tree, tree, int, tree);
7103 extern tree build_transaction_expr              (location_t, tree, int, tree);
7104 extern bool cxx_omp_create_clause_info          (tree, tree, bool, bool,
7105                                                  bool, bool);
7106 extern tree baselink_for_fns                    (tree);
7107 extern void finish_static_assert                (tree, tree, location_t,
7108                                                  bool);
7109 extern tree finish_decltype_type                (tree, bool, tsubst_flags_t);
7110 extern tree finish_trait_expr                   (enum cp_trait_kind, tree, tree);
7111 extern tree build_lambda_expr                   (void);
7112 extern tree build_lambda_object                 (tree);
7113 extern tree begin_lambda_type                   (tree);
7114 extern tree lambda_capture_field_type           (tree, bool, bool);
7115 extern tree lambda_return_type                  (tree);
7116 extern tree lambda_proxy_type                   (tree);
7117 extern tree lambda_function                     (tree);
7118 extern void apply_deduced_return_type           (tree, tree);
7119 extern tree add_capture                         (tree, tree, tree, bool, bool);
7120 extern tree add_default_capture                 (tree, tree, tree);
7121 extern void insert_capture_proxy                (tree);
7122 extern void insert_pending_capture_proxies      (void);
7123 extern bool is_capture_proxy                    (tree);
7124 extern bool is_normal_capture_proxy             (tree);
7125 extern bool is_constant_capture_proxy           (tree);
7126 extern void register_capture_members            (tree);
7127 extern tree lambda_expr_this_capture            (tree, bool);
7128 extern void maybe_generic_this_capture          (tree, tree);
7129 extern tree maybe_resolve_dummy                 (tree, bool);
7130 extern tree current_nonlambda_function          (void);
7131 extern tree nonlambda_method_basetype           (void);
7132 extern tree current_nonlambda_scope             (void);
7133 extern tree current_lambda_expr                 (void);
7134 extern bool generic_lambda_fn_p                 (tree);
7135 extern tree do_dependent_capture                (tree, bool = false);
7136 extern bool lambda_fn_in_template_p             (tree);
7137 extern void maybe_add_lambda_conv_op            (tree);
7138 extern bool is_lambda_ignored_entity            (tree);
7139 extern bool lambda_static_thunk_p               (tree);
7140 extern tree finish_builtin_launder              (location_t, tree,
7141                                                  tsubst_flags_t);
7142 extern void start_lambda_scope                  (tree);
7143 extern void record_lambda_scope                 (tree);
7144 extern void record_null_lambda_scope            (tree);
7145 extern void finish_lambda_scope                 (void);
7146 extern tree start_lambda_function               (tree fn, tree lambda_expr);
7147 extern void finish_lambda_function              (tree body);
7148
7149 /* in tree.c */
7150 extern int cp_tree_operand_length               (const_tree);
7151 extern int cp_tree_code_length                  (enum tree_code);
7152 extern void cp_free_lang_data                   (tree t);
7153 extern tree force_target_expr                   (tree, tree, tsubst_flags_t);
7154 extern tree build_target_expr_with_type         (tree, tree, tsubst_flags_t);
7155 extern void lang_check_failed                   (const char *, int,
7156                                                  const char *) ATTRIBUTE_NORETURN
7157                                                  ATTRIBUTE_COLD;
7158 extern tree stabilize_expr                      (tree, tree *);
7159 extern void stabilize_call                      (tree, tree *);
7160 extern bool stabilize_init                      (tree, tree *);
7161 extern tree add_stmt_to_compound                (tree, tree);
7162 extern void init_tree                           (void);
7163 extern bool pod_type_p                          (const_tree);
7164 extern bool layout_pod_type_p                   (const_tree);
7165 extern bool std_layout_type_p                   (const_tree);
7166 extern bool trivial_type_p                      (const_tree);
7167 extern bool trivially_copyable_p                (const_tree);
7168 extern bool type_has_unique_obj_representations (const_tree);
7169 extern bool scalarish_type_p                    (const_tree);
7170 extern bool type_has_nontrivial_default_init    (const_tree);
7171 extern bool type_has_nontrivial_copy_init       (const_tree);
7172 extern void maybe_warn_parm_abi                 (tree, location_t);
7173 extern bool class_tmpl_impl_spec_p              (const_tree);
7174 extern int zero_init_p                          (const_tree);
7175 extern bool check_abi_tag_redeclaration         (const_tree, const_tree,
7176                                                  const_tree);
7177 extern bool check_abi_tag_args                  (tree, tree);
7178 extern tree strip_typedefs                      (tree, bool * = NULL);
7179 extern tree strip_typedefs_expr                 (tree, bool * = NULL);
7180 extern tree copy_binfo                          (tree, tree, tree,
7181                                                  tree *, int);
7182 extern int member_p                             (const_tree);
7183 extern cp_lvalue_kind real_lvalue_p             (const_tree);
7184 extern cp_lvalue_kind lvalue_kind               (const_tree);
7185 extern bool glvalue_p                           (const_tree);
7186 extern bool obvalue_p                           (const_tree);
7187 extern bool xvalue_p                            (const_tree);
7188 extern bool bitfield_p                          (const_tree);
7189 extern tree cp_stabilize_reference              (tree);
7190 extern bool builtin_valid_in_constant_expr_p    (const_tree);
7191 extern tree build_min                           (enum tree_code, tree, ...);
7192 extern tree build_min_nt_loc                    (location_t, enum tree_code,
7193                                                  ...);
7194 extern tree build_min_non_dep                   (enum tree_code, tree, ...);
7195 extern tree build_min_non_dep_op_overload       (enum tree_code, tree, tree, ...);
7196 extern tree build_min_nt_call_vec (tree, vec<tree, va_gc> *);
7197 extern tree build_min_non_dep_call_vec          (tree, tree, vec<tree, va_gc> *);
7198 extern vec<tree, va_gc>* vec_copy_and_insert    (vec<tree, va_gc>*, tree, unsigned);
7199 extern tree build_cplus_new                     (tree, tree, tsubst_flags_t);
7200 extern tree build_aggr_init_expr                (tree, tree);
7201 extern tree get_target_expr                     (tree);
7202 extern tree get_target_expr_sfinae              (tree, tsubst_flags_t);
7203 extern tree build_cplus_array_type              (tree, tree);
7204 extern tree build_array_of_n_type               (tree, int);
7205 extern bool array_of_runtime_bound_p            (tree);
7206 extern bool vla_type_p                          (tree);
7207 extern tree build_array_copy                    (tree);
7208 extern tree build_vec_init_expr                 (tree, tree, tsubst_flags_t);
7209 extern void diagnose_non_constexpr_vec_init     (tree);
7210 extern tree hash_tree_cons                      (tree, tree, tree);
7211 extern tree hash_tree_chain                     (tree, tree);
7212 extern tree build_qualified_name                (tree, tree, tree, bool);
7213 extern tree build_ref_qualified_type            (tree, cp_ref_qualifier);
7214 inline tree ovl_first                           (tree) ATTRIBUTE_PURE;
7215 extern tree ovl_make                            (tree fn,
7216                                                  tree next = NULL_TREE);
7217 extern tree ovl_insert                          (tree fn, tree maybe_ovl,
7218                                                  bool using_p = false);
7219 extern tree ovl_skip_hidden                     (tree) ATTRIBUTE_PURE;
7220 extern void lookup_mark                         (tree lookup, bool val);
7221 extern tree lookup_add                          (tree fns, tree lookup);
7222 extern tree lookup_maybe_add                    (tree fns, tree lookup,
7223                                                  bool deduping);
7224 extern int is_overloaded_fn                     (tree) ATTRIBUTE_PURE;
7225 extern bool really_overloaded_fn                (tree) ATTRIBUTE_PURE;
7226 extern tree dependent_name                      (tree);
7227 extern tree maybe_get_fns                       (tree) ATTRIBUTE_PURE;
7228 extern tree get_fns                             (tree) ATTRIBUTE_PURE;
7229 extern tree get_first_fn                        (tree) ATTRIBUTE_PURE;
7230 extern tree ovl_scope                           (tree);
7231 extern const char *cxx_printable_name           (tree, int);
7232 extern const char *cxx_printable_name_translate (tree, int);
7233 extern tree canonical_eh_spec                   (tree);
7234 extern tree build_cp_fntype_variant             (tree, cp_ref_qualifier, tree, bool);
7235 extern tree build_exception_variant             (tree, tree);
7236 extern tree bind_template_template_parm         (tree, tree);
7237 extern tree array_type_nelts_total              (tree);
7238 extern tree array_type_nelts_top                (tree);
7239 extern tree break_out_target_exprs              (tree, bool = false);
7240 extern tree build_ctor_subob_ref                (tree, tree, tree);
7241 extern tree replace_placeholders                (tree, tree, bool * = NULL);
7242 extern bool find_placeholders                   (tree);
7243 extern tree get_type_decl                       (tree);
7244 extern tree decl_namespace_context              (tree);
7245 extern bool decl_anon_ns_mem_p                  (const_tree);
7246 extern tree lvalue_type                         (tree);
7247 extern tree error_type                          (tree);
7248 extern int varargs_function_p                   (const_tree);
7249 extern bool cp_tree_equal                       (tree, tree);
7250 extern tree no_linkage_check                    (tree, bool);
7251 extern void debug_binfo                         (tree);
7252 extern tree build_dummy_object                  (tree);
7253 extern tree maybe_dummy_object                  (tree, tree *);
7254 extern int is_dummy_object                      (const_tree);
7255 extern const struct attribute_spec cxx_attribute_table[];
7256 extern tree make_ptrmem_cst                     (tree, tree);
7257 extern tree cp_build_type_attribute_variant     (tree, tree);
7258 extern tree cp_build_reference_type             (tree, bool);
7259 extern tree move                                (tree);
7260 extern tree cp_build_qualified_type_real        (tree, int, tsubst_flags_t);
7261 #define cp_build_qualified_type(TYPE, QUALS) \
7262   cp_build_qualified_type_real ((TYPE), (QUALS), tf_warning_or_error)
7263 extern bool cv_qualified_p                      (const_tree);
7264 extern tree cv_unqualified                      (tree);
7265 extern special_function_kind special_function_p (const_tree);
7266 extern int count_trees                          (tree);
7267 extern int char_type_p                          (tree);
7268 extern void verify_stmt_tree                    (tree);
7269 extern linkage_kind decl_linkage                (tree);
7270 extern duration_kind decl_storage_duration      (tree);
7271 extern tree cp_walk_subtrees (tree*, int*, walk_tree_fn,
7272                               void*, hash_set<tree> *);
7273 #define cp_walk_tree(tp,func,data,pset) \
7274         walk_tree_1 (tp, func, data, pset, cp_walk_subtrees)
7275 #define cp_walk_tree_without_duplicates(tp,func,data) \
7276         walk_tree_without_duplicates_1 (tp, func, data, cp_walk_subtrees)
7277 extern tree rvalue                              (tree);
7278 extern tree convert_bitfield_to_declared_type   (tree);
7279 extern tree cp_save_expr                        (tree);
7280 extern bool cast_valid_in_integral_constant_expression_p (tree);
7281 extern bool cxx_type_hash_eq                    (const_tree, const_tree);
7282 extern tree cxx_copy_lang_qualifiers            (const_tree, const_tree);
7283
7284 extern void cxx_print_statistics                (void);
7285 extern bool maybe_warn_zero_as_null_pointer_constant (tree, location_t);
7286
7287 /* in ptree.c */
7288 extern void cxx_print_xnode                     (FILE *, tree, int);
7289 extern void cxx_print_decl                      (FILE *, tree, int);
7290 extern void cxx_print_type                      (FILE *, tree, int);
7291 extern void cxx_print_identifier                (FILE *, tree, int);
7292 extern void cxx_print_error_function            (diagnostic_context *,
7293                                                  const char *,
7294                                                  struct diagnostic_info *);
7295
7296 /* in typeck.c */
7297 extern bool cxx_mark_addressable                (tree, bool = false);
7298 extern int string_conv_p                        (const_tree, const_tree, int);
7299 extern tree cp_truthvalue_conversion            (tree);
7300 extern tree condition_conversion                (tree);
7301 extern tree require_complete_type               (tree);
7302 extern tree require_complete_type_sfinae        (tree, tsubst_flags_t);
7303 extern tree complete_type                       (tree);
7304 extern tree complete_type_or_else               (tree, tree);
7305 extern tree complete_type_or_maybe_complain     (tree, tree, tsubst_flags_t);
7306 inline bool type_unknown_p                      (const_tree);
7307 enum { ce_derived, ce_type, ce_normal, ce_exact };
7308 extern bool comp_except_specs                   (const_tree, const_tree, int);
7309 extern bool comptypes                           (tree, tree, int);
7310 extern bool same_type_ignoring_top_level_qualifiers_p (tree, tree);
7311 extern bool compparms                           (const_tree, const_tree);
7312 extern int comp_cv_qualification                (const_tree, const_tree);
7313 extern int comp_cv_qualification                (int, int);
7314 extern int comp_cv_qual_signature               (tree, tree);
7315 extern tree cxx_sizeof_or_alignof_expr          (tree, enum tree_code, bool);
7316 extern tree cxx_sizeof_or_alignof_type          (tree, enum tree_code, bool, bool);
7317 extern tree cxx_alignas_expr                    (tree);
7318 extern tree cxx_sizeof_nowarn                   (tree);
7319 extern tree is_bitfield_expr_with_lowered_type  (const_tree);
7320 extern tree unlowered_expr_type                 (const_tree);
7321 extern tree decay_conversion                    (tree,
7322                                                  tsubst_flags_t,
7323                                                  bool = true);
7324 extern tree build_class_member_access_expr      (cp_expr, tree, tree, bool,
7325                                                  tsubst_flags_t);
7326 extern tree finish_class_member_access_expr     (cp_expr, tree, bool,
7327                                                  tsubst_flags_t);
7328 extern tree build_x_indirect_ref                (location_t, tree,
7329                                                  ref_operator, tsubst_flags_t);
7330 extern tree cp_build_indirect_ref               (tree, ref_operator,
7331                                                  tsubst_flags_t);
7332 extern tree cp_build_fold_indirect_ref          (tree);
7333 extern tree build_array_ref                     (location_t, tree, tree);
7334 extern tree cp_build_array_ref                  (location_t, tree, tree,
7335                                                  tsubst_flags_t);
7336 extern tree get_member_function_from_ptrfunc    (tree *, tree, tsubst_flags_t);
7337 extern tree cp_build_function_call_nary         (tree, tsubst_flags_t, ...)
7338                                                 ATTRIBUTE_SENTINEL;
7339 extern tree cp_build_function_call_vec          (tree, vec<tree, va_gc> **,
7340                                                  tsubst_flags_t);
7341 extern tree build_x_binary_op                   (location_t,
7342                                                  enum tree_code, tree,
7343                                                  enum tree_code, tree,
7344                                                  enum tree_code, tree *,
7345                                                  tsubst_flags_t);
7346 extern tree build_x_array_ref                   (location_t, tree, tree,
7347                                                  tsubst_flags_t);
7348 extern tree build_x_unary_op                    (location_t,
7349                                                  enum tree_code, cp_expr,
7350                                                  tsubst_flags_t);
7351 extern tree cp_build_addressof                  (location_t, tree,
7352                                                  tsubst_flags_t);
7353 extern tree cp_build_addr_expr                  (tree, tsubst_flags_t);
7354 extern tree cp_build_unary_op                   (enum tree_code, tree, bool,
7355                                                  tsubst_flags_t);
7356 extern tree genericize_compound_lvalue          (tree);
7357 extern tree unary_complex_lvalue                (enum tree_code, tree);
7358 extern tree build_x_conditional_expr            (location_t, tree, tree, tree,
7359                                                  tsubst_flags_t);
7360 extern tree build_x_compound_expr_from_list     (tree, expr_list_kind,
7361                                                  tsubst_flags_t);
7362 extern tree build_x_compound_expr_from_vec      (vec<tree, va_gc> *,
7363                                                  const char *, tsubst_flags_t);
7364 extern tree build_x_compound_expr               (location_t, tree, tree,
7365                                                  tsubst_flags_t);
7366 extern tree build_compound_expr                 (location_t, tree, tree);
7367 extern tree cp_build_compound_expr              (tree, tree, tsubst_flags_t);
7368 extern tree build_static_cast                   (tree, tree, tsubst_flags_t);
7369 extern tree build_reinterpret_cast              (tree, tree, tsubst_flags_t);
7370 extern tree build_const_cast                    (tree, tree, tsubst_flags_t);
7371 extern tree build_c_cast                        (location_t, tree, tree);
7372 extern cp_expr build_c_cast                     (location_t loc, tree type,
7373                                                  cp_expr expr);
7374 extern tree cp_build_c_cast                     (tree, tree, tsubst_flags_t);
7375 extern cp_expr build_x_modify_expr              (location_t, tree,
7376                                                  enum tree_code, tree,
7377                                                  tsubst_flags_t);
7378 extern tree cp_build_modify_expr                (location_t, tree,
7379                                                  enum tree_code, tree,
7380                                                  tsubst_flags_t);
7381 extern tree convert_for_initialization          (tree, tree, tree, int,
7382                                                  impl_conv_rhs, tree, int,
7383                                                  tsubst_flags_t);
7384 extern int comp_ptr_ttypes                      (tree, tree);
7385 extern bool comp_ptr_ttypes_const               (tree, tree);
7386 extern bool error_type_p                        (const_tree);
7387 extern bool ptr_reasonably_similar              (const_tree, const_tree);
7388 extern tree build_ptrmemfunc                    (tree, tree, int, bool,
7389                                                  tsubst_flags_t);
7390 extern int cp_type_quals                        (const_tree);
7391 extern int type_memfn_quals                     (const_tree);
7392 extern cp_ref_qualifier type_memfn_rqual        (const_tree);
7393 extern tree apply_memfn_quals                   (tree, cp_cv_quals,
7394                                                  cp_ref_qualifier = REF_QUAL_NONE);
7395 extern bool cp_has_mutable_p                    (const_tree);
7396 extern bool at_least_as_qualified_p             (const_tree, const_tree);
7397 extern void cp_apply_type_quals_to_decl         (int, tree);
7398 extern tree build_ptrmemfunc1                   (tree, tree, tree);
7399 extern void expand_ptrmemfunc_cst               (tree, tree *, tree *);
7400 extern tree type_after_usual_arithmetic_conversions (tree, tree);
7401 extern tree common_pointer_type                 (tree, tree);
7402 extern tree composite_pointer_type              (tree, tree, tree, tree,
7403                                                  composite_pointer_operation,
7404                                                  tsubst_flags_t);
7405 extern tree merge_types                         (tree, tree);
7406 extern tree strip_array_domain                  (tree);
7407 extern tree check_return_expr                   (tree, bool *);
7408 extern tree cp_build_binary_op                  (location_t,
7409                                                  enum tree_code, tree, tree,
7410                                                  tsubst_flags_t);
7411 extern tree build_x_vec_perm_expr               (location_t,
7412                                                  tree, tree, tree,
7413                                                  tsubst_flags_t);
7414 #define cxx_sizeof(T)  cxx_sizeof_or_alignof_type (T, SIZEOF_EXPR, false, true)
7415 extern tree build_simple_component_ref          (tree, tree);
7416 extern tree build_ptrmemfunc_access_expr        (tree, tree);
7417 extern tree build_address                       (tree);
7418 extern tree build_nop                           (tree, tree);
7419 extern tree non_reference                       (tree);
7420 extern tree lookup_anon_field                   (tree, tree);
7421 extern bool invalid_nonstatic_memfn_p           (location_t, tree,
7422                                                  tsubst_flags_t);
7423 extern tree convert_member_func_to_ptr          (tree, tree, tsubst_flags_t);
7424 extern tree convert_ptrmem                      (tree, tree, bool, bool,
7425                                                  tsubst_flags_t);
7426 extern int lvalue_or_else                       (tree, enum lvalue_use,
7427                                                  tsubst_flags_t);
7428 extern void check_template_keyword              (tree);
7429 extern bool check_raw_literal_operator          (const_tree decl);
7430 extern bool check_literal_operator_args         (const_tree, bool *, bool *);
7431 extern void maybe_warn_about_useless_cast       (tree, tree, tsubst_flags_t);
7432 extern tree cp_perform_integral_promotions      (tree, tsubst_flags_t);
7433
7434 extern tree finish_left_unary_fold_expr      (tree, int);
7435 extern tree finish_right_unary_fold_expr     (tree, int);
7436 extern tree finish_binary_fold_expr          (tree, tree, int);
7437 extern bool treat_lvalue_as_rvalue_p         (tree, bool);
7438
7439 /* in typeck2.c */
7440 extern void require_complete_eh_spec_types      (tree, tree);
7441 extern void cxx_incomplete_type_diagnostic      (location_t, const_tree,
7442                                                  const_tree, diagnostic_t);
7443
7444 inline location_t
7445 cp_expr_loc_or_loc (const_tree t, location_t or_loc)
7446 {
7447   location_t loc = cp_expr_location (t);
7448   if (loc == UNKNOWN_LOCATION)
7449     loc = or_loc;
7450   return loc;
7451 }
7452
7453 inline void
7454 cxx_incomplete_type_diagnostic (const_tree value, const_tree type,
7455                                 diagnostic_t diag_kind)
7456 {
7457   cxx_incomplete_type_diagnostic (cp_expr_loc_or_loc (value, input_location),
7458                                   value, type, diag_kind);
7459 }
7460
7461 extern void cxx_incomplete_type_error           (location_t, const_tree,
7462                                                  const_tree);
7463 inline void
7464 cxx_incomplete_type_error (const_tree value, const_tree type)
7465 {
7466   cxx_incomplete_type_diagnostic (value, type, DK_ERROR);
7467 }
7468
7469 extern void cxx_incomplete_type_inform          (const_tree);
7470 extern tree error_not_base_type                 (tree, tree);
7471 extern tree binfo_or_else                       (tree, tree);
7472 extern void cxx_readonly_error                  (location_t, tree,
7473                                                  enum lvalue_use);
7474 extern void complete_type_check_abstract        (tree);
7475 extern int abstract_virtuals_error              (tree, tree);
7476 extern int abstract_virtuals_error              (abstract_class_use, tree);
7477 extern int abstract_virtuals_error_sfinae       (tree, tree, tsubst_flags_t);
7478 extern int abstract_virtuals_error_sfinae       (abstract_class_use, tree, tsubst_flags_t);
7479
7480 extern tree store_init_value                    (tree, tree, vec<tree, va_gc>**, int);
7481 extern tree split_nonconstant_init              (tree, tree);
7482 extern bool check_narrowing                     (tree, tree, tsubst_flags_t,
7483                                                  bool = false);
7484 extern tree digest_init                         (tree, tree, tsubst_flags_t);
7485 extern tree digest_init_flags                   (tree, tree, int, tsubst_flags_t);
7486 extern tree digest_nsdmi_init                   (tree, tree, tsubst_flags_t);
7487 extern tree build_scoped_ref                    (tree, tree, tree *);
7488 extern tree build_x_arrow                       (location_t, tree,
7489                                                  tsubst_flags_t);
7490 extern tree build_m_component_ref               (tree, tree, tsubst_flags_t);
7491 extern tree build_functional_cast               (tree, tree, tsubst_flags_t);
7492 extern tree add_exception_specifier             (tree, tree, tsubst_flags_t);
7493 extern tree merge_exception_specifiers          (tree, tree);
7494
7495 /* in mangle.c */
7496 extern void init_mangle                         (void);
7497 extern void mangle_decl                         (tree);
7498 extern const char *mangle_type_string           (tree);
7499 extern tree mangle_typeinfo_for_type            (tree);
7500 extern tree mangle_typeinfo_string_for_type     (tree);
7501 extern tree mangle_vtbl_for_type                (tree);
7502 extern tree mangle_vtt_for_type                 (tree);
7503 extern tree mangle_ctor_vtbl_for_type           (tree, tree);
7504 extern tree mangle_thunk                        (tree, int, tree, tree, tree);
7505 extern tree mangle_guard_variable               (tree);
7506 extern tree mangle_tls_init_fn                  (tree);
7507 extern tree mangle_tls_wrapper_fn               (tree);
7508 extern bool decl_tls_wrapper_p                  (tree);
7509 extern tree mangle_ref_init_variable            (tree);
7510 extern tree mangle_template_parm_object         (tree);
7511 extern char * get_mangled_vtable_map_var_name   (tree);
7512 extern bool mangle_return_type_p                (tree);
7513 extern tree mangle_decomp                       (tree, vec<tree> &);
7514
7515 /* in dump.c */
7516 extern bool cp_dump_tree                        (void *, tree);
7517
7518 /* In cp/cp-objcp-common.c.  */
7519
7520 extern alias_set_type cxx_get_alias_set         (tree);
7521 extern bool cxx_warn_unused_global_decl         (const_tree);
7522 extern size_t cp_tree_size                      (enum tree_code);
7523 extern bool cp_var_mod_type_p                   (tree, tree);
7524 extern void cxx_initialize_diagnostics          (diagnostic_context *);
7525 extern int cxx_types_compatible_p               (tree, tree);
7526 extern bool cxx_block_may_fallthru              (const_tree);
7527
7528 /* in cp-gimplify.c */
7529 extern int cp_gimplify_expr                     (tree *, gimple_seq *,
7530                                                  gimple_seq *);
7531 extern void cp_genericize                       (tree);
7532 extern bool cxx_omp_const_qual_no_mutable       (tree);
7533 extern enum omp_clause_default_kind cxx_omp_predetermined_sharing_1 (tree);
7534 extern enum omp_clause_default_kind cxx_omp_predetermined_sharing (tree);
7535 extern tree cxx_omp_clause_default_ctor         (tree, tree, tree);
7536 extern tree cxx_omp_clause_copy_ctor            (tree, tree, tree);
7537 extern tree cxx_omp_clause_assign_op            (tree, tree, tree);
7538 extern tree cxx_omp_clause_dtor                 (tree, tree);
7539 extern void cxx_omp_finish_clause               (tree, gimple_seq *);
7540 extern bool cxx_omp_privatize_by_reference      (const_tree);
7541 extern bool cxx_omp_disregard_value_expr        (tree, bool);
7542 extern void cp_fold_function                    (tree);
7543 extern tree cp_fully_fold                       (tree);
7544 extern void clear_fold_cache                    (void);
7545 extern tree lookup_hotness_attribute            (tree);
7546 extern tree process_stmt_hotness_attribute      (tree);
7547
7548 /* in name-lookup.c */
7549 extern tree strip_using_decl                    (tree);
7550
7551 /* Tell the binding oracle what kind of binding we are looking for.  */
7552
7553 enum cp_oracle_request
7554 {
7555   CP_ORACLE_IDENTIFIER
7556 };
7557
7558 /* If this is non-NULL, then it is a "binding oracle" which can lazily
7559    create bindings when needed by the C compiler.  The oracle is told
7560    the name and type of the binding to create.  It can call pushdecl
7561    or the like to ensure the binding is visible; or do nothing,
7562    leaving the binding untouched.  c-decl.c takes note of when the
7563    oracle has been called and will not call it again if it fails to
7564    create a given binding.  */
7565
7566 typedef void cp_binding_oracle_function (enum cp_oracle_request, tree identifier);
7567
7568 extern cp_binding_oracle_function *cp_binding_oracle;
7569
7570 /* in constraint.cc */
7571 extern void init_constraint_processing          ();
7572 extern bool constraint_p                        (tree);
7573 extern tree conjoin_constraints                 (tree, tree);
7574 extern tree conjoin_constraints                 (tree);
7575 extern tree get_constraints                     (tree);
7576 extern void set_constraints                     (tree, tree);
7577 extern void remove_constraints                  (tree);
7578 extern tree current_template_constraints        (void);
7579 extern tree associate_classtype_constraints     (tree);
7580 extern tree build_constraints                   (tree, tree);
7581 extern tree get_shorthand_constraints           (tree);
7582 extern tree build_concept_check                 (tree, tree, tree = NULL_TREE);
7583 extern tree build_constrained_parameter         (tree, tree, tree = NULL_TREE);
7584 extern tree make_constrained_auto               (tree, tree);
7585 extern void placeholder_extract_concept_and_args (tree, tree&, tree&);
7586 extern bool equivalent_placeholder_constraints  (tree, tree);
7587 extern hashval_t hash_placeholder_constraint    (tree);
7588 extern bool deduce_constrained_parameter        (tree, tree&, tree&);
7589 extern tree resolve_constraint_check            (tree);
7590 extern tree check_function_concept              (tree);
7591 extern tree finish_template_introduction        (tree, tree);
7592 extern bool valid_requirements_p                (tree);
7593 extern tree finish_concept_name                 (tree);
7594 extern tree finish_shorthand_constraint         (tree, tree);
7595 extern tree finish_requires_expr                (tree, tree);
7596 extern tree finish_simple_requirement           (tree);
7597 extern tree finish_type_requirement             (tree);
7598 extern tree finish_compound_requirement         (tree, tree, bool);
7599 extern tree finish_nested_requirement           (tree);
7600 extern void check_constrained_friend            (tree, tree);
7601 extern tree tsubst_requires_expr                (tree, tree, tsubst_flags_t, tree);
7602 extern tree tsubst_constraint                   (tree, tree, tsubst_flags_t, tree);
7603 extern tree tsubst_constraint_info              (tree, tree, tsubst_flags_t, tree);
7604 extern bool function_concept_check_p            (tree);
7605 extern tree normalize_expression                (tree);
7606 extern tree expand_concept                      (tree, tree);
7607 extern bool expanding_concept                   ();
7608 extern tree evaluate_constraints                (tree, tree);
7609 extern tree evaluate_function_concept           (tree, tree);
7610 extern tree evaluate_variable_concept           (tree, tree);
7611 extern tree evaluate_constraint_expression      (tree, tree);
7612 extern bool constraints_satisfied_p             (tree);
7613 extern bool constraints_satisfied_p             (tree, tree);
7614 extern tree lookup_constraint_satisfaction      (tree, tree);
7615 extern tree memoize_constraint_satisfaction     (tree, tree, tree);
7616 extern tree lookup_concept_satisfaction         (tree, tree);
7617 extern tree memoize_concept_satisfaction        (tree, tree, tree);
7618 extern tree get_concept_expansion               (tree, tree);
7619 extern tree save_concept_expansion              (tree, tree, tree);
7620 extern bool* lookup_subsumption_result          (tree, tree);
7621 extern bool save_subsumption_result             (tree, tree, bool);
7622
7623 extern bool equivalent_constraints              (tree, tree);
7624 extern bool equivalently_constrained            (tree, tree);
7625 extern bool subsumes_constraints                (tree, tree);
7626 extern bool strictly_subsumes                   (tree, tree);
7627 extern int more_constrained                     (tree, tree);
7628
7629 extern void diagnose_constraints                (location_t, tree, tree);
7630
7631 /* in logic.cc */
7632 extern tree decompose_conclusions               (tree);
7633 extern bool subsumes                            (tree, tree);
7634
7635 /* In class.c */
7636 extern void cp_finish_injected_record_type (tree);
7637
7638 /* in vtable-class-hierarchy.c */
7639 extern void vtv_compute_class_hierarchy_transitive_closure (void);
7640 extern void vtv_generate_init_routine           (void);
7641 extern void vtv_save_class_info                 (tree);
7642 extern void vtv_recover_class_info              (void);
7643 extern void vtv_build_vtable_verify_fndecl      (void);
7644
7645 /* In constexpr.c */
7646 extern void fini_constexpr                      (void);
7647 extern bool literal_type_p                      (tree);
7648 extern tree register_constexpr_fundef           (tree, tree);
7649 extern bool is_valid_constexpr_fn               (tree, bool);
7650 extern bool check_constexpr_ctor_body           (tree, tree, bool);
7651 extern tree constexpr_fn_retval         (tree);
7652 extern tree ensure_literal_type_for_constexpr_object (tree);
7653 extern bool potential_constant_expression       (tree);
7654 extern bool is_constant_expression (tree);
7655 extern bool is_nondependent_constant_expression (tree);
7656 extern bool is_nondependent_static_init_expression (tree);
7657 extern bool is_static_init_expression    (tree);
7658 extern bool potential_rvalue_constant_expression (tree);
7659 extern bool require_potential_constant_expression (tree);
7660 extern bool require_constant_expression (tree);
7661 extern bool require_rvalue_constant_expression (tree);
7662 extern bool require_potential_rvalue_constant_expression (tree);
7663 extern tree cxx_constant_value                  (tree, tree = NULL_TREE);
7664 extern tree cxx_constant_init                   (tree, tree = NULL_TREE);
7665 extern tree maybe_constant_value                (tree, tree = NULL_TREE);
7666 extern tree maybe_constant_init                 (tree, tree = NULL_TREE, bool = false);
7667 extern tree fold_non_dependent_expr             (tree, tsubst_flags_t = tf_warning_or_error);
7668 extern tree fold_simple                         (tree);
7669 extern bool is_sub_constant_expr                (tree);
7670 extern bool reduced_constant_expression_p       (tree);
7671 extern bool is_instantiation_of_constexpr       (tree);
7672 extern bool var_in_constexpr_fn                 (tree);
7673 extern bool var_in_maybe_constexpr_fn           (tree);
7674 extern void explain_invalid_constexpr_fn        (tree);
7675 extern vec<tree> cx_error_context               (void);
7676 extern tree fold_sizeof_expr                    (tree);
7677 extern void clear_cv_and_fold_caches            (void);
7678
7679 /* In cp-ubsan.c */
7680 extern void cp_ubsan_maybe_instrument_member_call (tree);
7681 extern void cp_ubsan_instrument_member_accesses (tree *);
7682 extern tree cp_ubsan_maybe_instrument_downcast  (location_t, tree, tree, tree);
7683 extern tree cp_ubsan_maybe_instrument_cast_to_vbase (location_t, tree, tree);
7684 extern void cp_ubsan_maybe_initialize_vtbl_ptrs (tree);
7685
7686 /* Inline bodies.  */
7687
7688 inline tree
7689 ovl_first (tree node)
7690 {
7691   while (TREE_CODE (node) == OVERLOAD)
7692     node = OVL_FUNCTION (node);
7693   return node;
7694 }
7695
7696 inline bool
7697 type_unknown_p (const_tree expr)
7698 {
7699   return TREE_TYPE (expr) == unknown_type_node;
7700 }
7701
7702 inline hashval_t
7703 named_decl_hash::hash (const value_type decl)
7704 {
7705   tree name = OVL_NAME (decl);
7706   return name ? IDENTIFIER_HASH_VALUE (name) : 0;
7707 }
7708
7709 inline bool
7710 named_decl_hash::equal (const value_type existing, compare_type candidate)
7711 {
7712   tree name = OVL_NAME (existing);
7713   return candidate == name;
7714 }
7715
7716 inline bool
7717 null_node_p (const_tree expr)
7718 {
7719   STRIP_ANY_LOCATION_WRAPPER (expr);
7720   return expr == null_node;
7721 }
7722
7723 #if CHECKING_P
7724 namespace selftest {
7725   extern void run_cp_tests (void);
7726
7727   /* Declarations for specific families of tests within cp,
7728      by source file, in alphabetical order.  */
7729   extern void cp_pt_c_tests ();
7730   extern void cp_tree_c_tests (void);
7731 } // namespace selftest
7732 #endif /* #if CHECKING_P */
7733
7734 /* -- end of C++ */
7735
7736 #endif /* ! GCC_CP_TREE_H */