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    1: IDENTIFIER_KIND_BIT_1 (in IDENTIFIER_NODE)
 413       TI_PENDING_TEMPLATE_FLAG.
 414       TEMPLATE_PARMS_FOR_INLINE.
 415       DELETE_EXPR_USE_VEC (in DELETE_EXPR).
 416       (TREE_CALLS_NEW) (in _EXPR or _REF) (commented-out).
 417       ICS_ELLIPSIS_FLAG (in _CONV)
 418       DECL_INITIALIZED_P (in VAR_DECL)
 419       TYPENAME_IS_CLASS_P (in TYPENAME_TYPE)
 420       STMT_IS_FULL_EXPR_P (in _STMT)
 421       TARGET_EXPR_LIST_INIT_P (in TARGET_EXPR)
 422       LAMBDA_EXPR_MUTABLE_P (in LAMBDA_EXPR)
 423       DECL_FINAL_P (in FUNCTION_DECL)
 424       QUALIFIED_NAME_IS_TEMPLATE (in SCOPE_REF)
 425       DECLTYPE_FOR_INIT_CAPTURE (in DECLTYPE_TYPE)
 426       TINFO_USED_TEMPLATE_ID (in TEMPLATE_INFO)
 427       PACK_EXPANSION_SIZEOF_P (in *_PACK_EXPANSION)
 428       OVL_USING_P (in OVERLOAD)
 429       IMPLICIT_CONV_EXPR_NONTYPE_ARG (in IMPLICIT_CONV_EXPR)
 430    2: IDENTIFIER_KIND_BIT_2 (in IDENTIFIER_NODE)
 431       ICS_THIS_FLAG (in _CONV)
 432       DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (in VAR_DECL)
 433       STATEMENT_LIST_TRY_BLOCK (in STATEMENT_LIST)
 434       TYPENAME_IS_RESOLVING_P (in TYPE_NAME_TYPE)
 435       TARGET_EXPR_DIRECT_INIT_P (in TARGET_EXPR)
 436       FNDECL_USED_AUTO (in FUNCTION_DECL)
 437       DECLTYPE_FOR_LAMBDA_PROXY (in DECLTYPE_TYPE)
 438       REF_PARENTHESIZED_P (in COMPONENT_REF, INDIRECT_REF, SCOPE_REF, VIEW_CONVERT_EXPR)
 439       AGGR_INIT_ZERO_FIRST (in AGGR_INIT_EXPR)
 440       CONSTRUCTOR_MUTABLE_POISON (in CONSTRUCTOR)
 441       OVL_HIDDEN_P (in OVERLOAD)
 442       SWITCH_STMT_NO_BREAK_P (in SWITCH_STMT)
 443       LAMBDA_EXPR_CAPTURE_OPTIMIZED (in LAMBDA_EXPR)
 444    3: (TREE_REFERENCE_EXPR) (in NON_LVALUE_EXPR) (commented-out).
 445       ICS_BAD_FLAG (in _CONV)
 446       FN_TRY_BLOCK_P (in TRY_BLOCK)
 447       BIND_EXPR_BODY_BLOCK (in BIND_EXPR)
 448       DECL_NONTRIVIALLY_INITIALIZED_P (in VAR_DECL)
 449       CALL_EXPR_ORDERED_ARGS (in CALL_EXPR, AGGR_INIT_EXPR)
 450       DECLTYPE_FOR_REF_CAPTURE (in DECLTYPE_TYPE)
 451       CONSTRUCTOR_C99_COMPOUND_LITERAL (in CONSTRUCTOR)
 452       OVL_NESTED_P (in OVERLOAD)
 453    4: IDENTIFIER_MARKED (IDENTIFIER_NODEs)
 454       TREE_HAS_CONSTRUCTOR (in INDIRECT_REF, SAVE_EXPR, CONSTRUCTOR,
 455           CALL_EXPR, or FIELD_DECL).
 456       DECL_TINFO_P (in VAR_DECL)
 457       FUNCTION_REF_QUALIFIED (in FUNCTION_TYPE, METHOD_TYPE)
 458       OVL_LOOKUP_P (in OVERLOAD)
 459       LOOKUP_FOUND_P (in RECORD_TYPE, UNION_TYPE, NAMESPACE_DECL)
 460    5: IDENTIFIER_VIRTUAL_P (in IDENTIFIER_NODE)
 461       DECL_VTABLE_OR_VTT_P (in VAR_DECL)
 462       FUNCTION_RVALUE_QUALIFIED (in FUNCTION_TYPE, METHOD_TYPE)
 463       CALL_EXPR_REVERSE_ARGS (in CALL_EXPR, AGGR_INIT_EXPR)
 464       CONSTRUCTOR_PLACEHOLDER_BOUNDARY (in CONSTRUCTOR)
 465    6: IDENTIFIER_REPO_CHOSEN (in IDENTIFIER_NODE)
 466       DECL_CONSTRUCTION_VTABLE_P (in VAR_DECL)
 467       TYPE_MARKED_P (in _TYPE)
 468       RANGE_FOR_IVDEP (in RANGE_FOR_STMT)
 469       CALL_EXPR_OPERATOR_SYNTAX (in CALL_EXPR, AGGR_INIT_EXPR)
 470
 471    Usage of TYPE_LANG_FLAG_?:
 472    0: TYPE_DEPENDENT_P
 473    1: TYPE_HAS_USER_CONSTRUCTOR.
 474    2: TYPE_HAS_LATE_RETURN_TYPE (in FUNCTION_TYPE, METHOD_TYPE)
 475       TYPE_PTRMEMFUNC_FLAG (in RECORD_TYPE)
 476    4: TYPE_HAS_NONTRIVIAL_DESTRUCTOR
 477    5: CLASS_TYPE_P (in RECORD_TYPE and UNION_TYPE)
 478       ENUM_FIXED_UNDERLYING_TYPE_P (in ENUMERAL_TYPE)
 479       AUTO_IS_DECLTYPE (in TEMPLATE_TYPE_PARM)
 480       REFERENCE_VLA_OK (in REFERENCE_TYPE)
 481    6: TYPE_DEPENDENT_P_VALID
 482
 483    Usage of DECL_LANG_FLAG_?:
 484    0: DECL_TEMPLATE_PARM_P (in PARM_DECL, CONST_DECL, TYPE_DECL, or TEMPLATE_DECL)
 485       DECL_LOCAL_FUNCTION_P (in FUNCTION_DECL)
 486       DECL_MUTABLE_P (in FIELD_DECL)
 487       DECL_DEPENDENT_P (in USING_DECL)
 488       LABEL_DECL_BREAK (in LABEL_DECL)
 489    1: C_TYPEDEF_EXPLICITLY_SIGNED (in TYPE_DECL).
 490       DECL_TEMPLATE_INSTANTIATED (in a VAR_DECL or a FUNCTION_DECL)
 491       DECL_MEMBER_TEMPLATE_P (in TEMPLATE_DECL)
 492       USING_DECL_TYPENAME_P (in USING_DECL)
 493       DECL_VLA_CAPTURE_P (in FIELD_DECL)
 494       DECL_ARRAY_PARAMETER_P (in PARM_DECL)
 495       LABEL_DECL_CONTINUE (in LABEL_DECL)
 496    2: DECL_THIS_EXTERN (in VAR_DECL or FUNCTION_DECL).
 497       DECL_IMPLICIT_TYPEDEF_P (in a TYPE_DECL)
 498       DECL_CONSTRAINT_VAR_P (in a PARM_DECL)
 499       TEMPLATE_DECL_COMPLEX_ALIAS_P (in TEMPLATE_DECL)
 500       DECL_INSTANTIATING_NSDMI_P (in a FIELD_DECL)
 501       LABEL_DECL_CDTOR (in LABEL_DECL)
 502    3: DECL_IN_AGGR_P.
 503    4: DECL_C_BIT_FIELD (in a FIELD_DECL)
 504       DECL_ANON_UNION_VAR_P (in a VAR_DECL)
 505       DECL_SELF_REFERENCE_P (in a TYPE_DECL)
 506       DECL_INVALID_OVERRIDER_P (in a FUNCTION_DECL)
 507    5: DECL_INTERFACE_KNOWN.
 508    6: DECL_THIS_STATIC (in VAR_DECL or FUNCTION_DECL).
 509       DECL_FIELD_IS_BASE (in FIELD_DECL)
 510       TYPE_DECL_ALIAS_P (in TYPE_DECL)
 511    7: DECL_THUNK_P (in a member FUNCTION_DECL)
 512       DECL_NORMAL_CAPTURE_P (in FIELD_DECL)
 513    8: DECL_DECLARED_CONSTEXPR_P (in VAR_DECL, FUNCTION_DECL)
 514
 515    Usage of language-independent fields in a language-dependent manner:
 516
 517    TYPE_ALIAS_SET
 518      This field is used by TYPENAME_TYPEs, TEMPLATE_TYPE_PARMs, and so
 519      forth as a substitute for the mark bits provided in `lang_type'.
 520      At present, only the six low-order bits are used.
 521
 522    TYPE_LANG_SLOT_1
 523      For a FUNCTION_TYPE or METHOD_TYPE, this is TYPE_RAISES_EXCEPTIONS.
 524      For a POINTER_TYPE (to a METHOD_TYPE), this is TYPE_PTRMEMFUNC_TYPE.
 525      For an ENUMERAL_TYPE, BOUND_TEMPLATE_TEMPLATE_PARM_TYPE,
 526      RECORD_TYPE or UNION_TYPE this is TYPE_TEMPLATE_INFO,
 527
 528   BINFO_VIRTUALS
 529      For a binfo, this is a TREE_LIST.  There is an entry for each
 530      virtual function declared either in BINFO or its direct and
 531      indirect primary bases.
 532
 533      The BV_DELTA of each node gives the amount by which to adjust the
 534      `this' pointer when calling the function.  If the method is an
 535      overridden version of a base class method, then it is assumed
 536      that, prior to adjustment, the this pointer points to an object
 537      of the base class.
 538
 539      The BV_VCALL_INDEX of each node, if non-NULL, gives the vtable
 540      index of the vcall offset for this entry.
 541
 542      The BV_FN is the declaration for the virtual function itself.
 543
 544      If BV_LOST_PRIMARY is set, it means that this entry is for a lost
 545      primary virtual base and can be left null in the vtable.
 546
 547    BINFO_VTABLE
 548      This is an expression with POINTER_TYPE that gives the value
 549      to which the vptr should be initialized.  Use get_vtbl_decl_for_binfo
 550      to extract the VAR_DECL for the complete vtable.
 551
 552    DECL_VINDEX
 553      This field is NULL for a non-virtual function.  For a virtual
 554      function, it is eventually set to an INTEGER_CST indicating the
 555      index in the vtable at which this function can be found.  When
 556      a virtual function is declared, but before it is known what
 557      function is overridden, this field is the error_mark_node.
 558
 559      Temporarily, it may be set to a TREE_LIST whose TREE_VALUE is
 560      the virtual function this one overrides, and whose TREE_CHAIN is
 561      the old DECL_VINDEX.  */
 562
 563 /* Language-specific tree checkers.  */
 564
 565 #define VAR_OR_FUNCTION_DECL_CHECK(NODE) \
 566   TREE_CHECK2(NODE,VAR_DECL,FUNCTION_DECL)
 567
 568 #define TYPE_FUNCTION_OR_TEMPLATE_DECL_CHECK(NODE) \
 569   TREE_CHECK3(NODE,TYPE_DECL,TEMPLATE_DECL,FUNCTION_DECL)
 570
 571 #define TYPE_FUNCTION_OR_TEMPLATE_DECL_P(NODE) \
 572   (TREE_CODE (NODE) == TYPE_DECL || TREE_CODE (NODE) == TEMPLATE_DECL \
 573    || TREE_CODE (NODE) == FUNCTION_DECL)
 574
 575 #define VAR_FUNCTION_OR_PARM_DECL_CHECK(NODE) \
 576   TREE_CHECK3(NODE,VAR_DECL,FUNCTION_DECL,PARM_DECL)
 577
 578 #define VAR_TEMPL_TYPE_OR_FUNCTION_DECL_CHECK(NODE) \
 579   TREE_CHECK4(NODE,VAR_DECL,FUNCTION_DECL,TYPE_DECL,TEMPLATE_DECL)
 580
 581 #define VAR_TEMPL_TYPE_FIELD_OR_FUNCTION_DECL_CHECK(NODE) \
 582   TREE_CHECK5(NODE,VAR_DECL,FIELD_DECL,FUNCTION_DECL,TYPE_DECL,TEMPLATE_DECL)
 583
 584 #define BOUND_TEMPLATE_TEMPLATE_PARM_TYPE_CHECK(NODE) \
 585   TREE_CHECK(NODE,BOUND_TEMPLATE_TEMPLATE_PARM)
 586
 587 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
 588 #define THUNK_FUNCTION_CHECK(NODE) __extension__                        \
 589 ({  __typeof (NODE) const __t = (NODE);                                 \
 590     if (TREE_CODE (__t) != FUNCTION_DECL || !__t->decl_common.lang_specific \
 591         || !__t->decl_common.lang_specific->u.fn.thunk_p)               \
 592       tree_check_failed (__t, __FILE__, __LINE__, __FUNCTION__, 0);     \
 593      __t; })
 594 #else
 595 #define THUNK_FUNCTION_CHECK(NODE) (NODE)
 596 #endif
 597 \f
 598 /* Language-dependent contents of an identifier.  */
 599
 600 struct GTY(()) lang_identifier {
 601   struct c_common_identifier c_common;
 602   cxx_binding *bindings;
 603 };
 604
 605 /* Return a typed pointer version of T if it designates a
 606    C++ front-end identifier.  */
 607 inline lang_identifier*
 608 identifier_p (tree t)
 609 {
 610   if (TREE_CODE (t) == IDENTIFIER_NODE)
 611     return (lang_identifier*) t;
 612   return NULL;
 613 }
 614
 615 #define LANG_IDENTIFIER_CAST(NODE) \
 616         ((struct lang_identifier*)IDENTIFIER_NODE_CHECK (NODE))
 617
 618 struct GTY(()) template_parm_index {
 619   struct tree_common common;
 620   int index;
 621   int level;
 622   int orig_level;
 623   tree decl;
 624 };
 625
 626 struct GTY(()) ptrmem_cst {
 627   struct tree_common common;
 628   tree member;
 629 };
 630 typedef struct ptrmem_cst * ptrmem_cst_t;
 631
 632 #define CLEANUP_P(NODE)         TREE_LANG_FLAG_0 (TRY_BLOCK_CHECK (NODE))
 633
 634 #define BIND_EXPR_TRY_BLOCK(NODE) \
 635   TREE_LANG_FLAG_0 (BIND_EXPR_CHECK (NODE))
 636
 637 /* Used to mark the block around the member initializers and cleanups.  */
 638 #define BIND_EXPR_BODY_BLOCK(NODE) \
 639   TREE_LANG_FLAG_3 (BIND_EXPR_CHECK (NODE))
 640 #define FUNCTION_NEEDS_BODY_BLOCK(NODE) \
 641   (DECL_CONSTRUCTOR_P (NODE) || DECL_DESTRUCTOR_P (NODE) \
 642    || LAMBDA_FUNCTION_P (NODE))
 643
 644 #define STATEMENT_LIST_NO_SCOPE(NODE) \
 645   TREE_LANG_FLAG_0 (STATEMENT_LIST_CHECK (NODE))
 646 #define STATEMENT_LIST_TRY_BLOCK(NODE) \
 647   TREE_LANG_FLAG_2 (STATEMENT_LIST_CHECK (NODE))
 648
 649 /* Mark the outer curly brace BLOCK.  */
 650 #define BLOCK_OUTER_CURLY_BRACE_P(NODE) TREE_LANG_FLAG_0 (BLOCK_CHECK (NODE))
 651
 652 /* Nonzero if this statement should be considered a full-expression,
 653    i.e., if temporaries created during this statement should have
 654    their destructors run at the end of this statement.  */
 655 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 656
 657 /* Marks the result of a statement expression.  */
 658 #define EXPR_STMT_STMT_EXPR_RESULT(NODE) \
 659   TREE_LANG_FLAG_0 (EXPR_STMT_CHECK (NODE))
 660
 661 /* Nonzero if this statement-expression does not have an associated scope.  */
 662 #define STMT_EXPR_NO_SCOPE(NODE) \
 663    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
 664
 665 #define COND_EXPR_IS_VEC_DELETE(NODE) \
 666   TREE_LANG_FLAG_0 (COND_EXPR_CHECK (NODE))
 667
 668 /* Nonzero if this NOP_EXPR is a reinterpret_cast.  Such conversions
 669    are not constexprs.  Other NOP_EXPRs are.  */
 670 #define REINTERPRET_CAST_P(NODE)                \
 671   TREE_LANG_FLAG_0 (NOP_EXPR_CHECK (NODE))
 672
 673 /* Returns nonzero iff TYPE1 and TYPE2 are the same type, in the usual
 674    sense of `same'.  */
 675 #define same_type_p(TYPE1, TYPE2) \
 676   comptypes ((TYPE1), (TYPE2), COMPARE_STRICT)
 677
 678 /* Returns nonzero iff NODE is a declaration for the global function
 679    `main'.  */
 680 #define DECL_MAIN_P(NODE)                               \
 681    (DECL_EXTERN_C_FUNCTION_P (NODE)                     \
 682     && DECL_NAME (NODE) != NULL_TREE                    \
 683     && MAIN_NAME_P (DECL_NAME (NODE))                   \
 684     && flag_hosted)
 685
 686 /* Lookup walker marking.  */
 687 #define LOOKUP_SEEN_P(NODE) TREE_VISITED(NODE)
 688 #define LOOKUP_FOUND_P(NODE) \
 689   TREE_LANG_FLAG_4 (TREE_CHECK3(NODE,RECORD_TYPE,UNION_TYPE,NAMESPACE_DECL))
 690
 691 /* These two accessors should only be used by OVL manipulators.
 692    Other users should use iterators and convenience functions.  */
 693 #define OVL_FUNCTION(NODE) \
 694   (((struct tree_overload*)OVERLOAD_CHECK (NODE))->function)
 695 #define OVL_CHAIN(NODE) \
 696   (((struct tree_overload*)OVERLOAD_CHECK (NODE))->common.chain)
 697
 698 /* If set, this was imported in a using declaration.   */
 699 #define OVL_USING_P(NODE)       TREE_LANG_FLAG_1 (OVERLOAD_CHECK (NODE))
 700 /* If set, this overload is a hidden decl.  */
 701 #define OVL_HIDDEN_P(NODE)      TREE_LANG_FLAG_2 (OVERLOAD_CHECK (NODE))
 702 /* If set, this overload contains a nested overload.  */
 703 #define OVL_NESTED_P(NODE)      TREE_LANG_FLAG_3 (OVERLOAD_CHECK (NODE))
 704 /* If set, this overload was constructed during lookup.  */
 705 #define OVL_LOOKUP_P(NODE)      TREE_LANG_FLAG_4 (OVERLOAD_CHECK (NODE))
 706 /* If set, this is a persistant lookup. */
 707 #define OVL_USED_P(NODE)        TREE_USED (OVERLOAD_CHECK (NODE))
 708
 709 /* The first decl of an overload.  */
 710 #define OVL_FIRST(NODE) ovl_first (NODE)
 711 /* The name of the overload set.  */
 712 #define OVL_NAME(NODE) DECL_NAME (OVL_FIRST (NODE))
 713
 714 /* Whether this is a set of overloaded functions.  TEMPLATE_DECLS are
 715    always wrapped in an OVERLOAD, so we don't need to check them
 716    here.  */
 717 #define OVL_P(NODE) \
 718   (TREE_CODE (NODE) == FUNCTION_DECL || TREE_CODE (NODE) == OVERLOAD)
 719 /* Whether this is a single member overload.  */
 720 #define OVL_SINGLE_P(NODE) \
 721   (TREE_CODE (NODE) != OVERLOAD || !OVL_CHAIN (NODE))
 722
 723 /* OVL_HIDDEN_P nodes come first, then OVL_USING_P nodes, then regular
 724    fns.  */
 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 struct GTY(()) tree_template_decl {
 872   struct tree_decl_common common;
 873   tree arguments;
 874   tree result;
 875 };
 876
 877 /* Returns true iff NODE is a BASELINK.  */
 878 #define BASELINK_P(NODE) \
 879   (TREE_CODE (NODE) == BASELINK)
 880 /* The BINFO indicating the base in which lookup found the
 881    BASELINK_FUNCTIONS.  */
 882 #define BASELINK_BINFO(NODE) \
 883   (((struct tree_baselink*) BASELINK_CHECK (NODE))->binfo)
 884 /* The functions referred to by the BASELINK; either a FUNCTION_DECL,
 885    a TEMPLATE_DECL, an OVERLOAD, or a TEMPLATE_ID_EXPR.  */
 886 #define BASELINK_FUNCTIONS(NODE) \
 887   (((struct tree_baselink*) BASELINK_CHECK (NODE))->functions)
 888 /* If T is a BASELINK, grab the functions, otherwise just T, which is
 889    expected to already be a (list of) functions.  */
 890 #define MAYBE_BASELINK_FUNCTIONS(T) \
 891   (BASELINK_P (T) ? BASELINK_FUNCTIONS (T) : T)
 892 /* The BINFO in which the search for the functions indicated by this baselink
 893    began.  This base is used to determine the accessibility of functions
 894    selected by overload resolution.  */
 895 #define BASELINK_ACCESS_BINFO(NODE) \
 896   (((struct tree_baselink*) BASELINK_CHECK (NODE))->access_binfo)
 897 /* For a type-conversion operator, the BASELINK_OPTYPE indicates the type
 898    to which the conversion should occur.  This value is important if
 899    the BASELINK_FUNCTIONS include a template conversion operator --
 900    the BASELINK_OPTYPE can be used to determine what type the user
 901    requested.  */
 902 #define BASELINK_OPTYPE(NODE) \
 903   (TREE_CHAIN (BASELINK_CHECK (NODE)))
 904 /* Nonzero if this baselink was from a qualified lookup.  */
 905 #define BASELINK_QUALIFIED_P(NODE) \
 906   TREE_LANG_FLAG_0 (BASELINK_CHECK (NODE))
 907
 908 struct GTY(()) tree_baselink {
 909   struct tree_common common;
 910   tree binfo;
 911   tree functions;
 912   tree access_binfo;
 913 };
 914
 915 /* The different kinds of ids that we encounter.  */
 916
 917 enum cp_id_kind
 918 {
 919   /* Not an id at all.  */
 920   CP_ID_KIND_NONE,
 921   /* An unqualified-id that is not a template-id.  */
 922   CP_ID_KIND_UNQUALIFIED,
 923   /* An unqualified-id that is a dependent name.  */
 924   CP_ID_KIND_UNQUALIFIED_DEPENDENT,
 925   /* An unqualified template-id.  */
 926   CP_ID_KIND_TEMPLATE_ID,
 927   /* A qualified-id.  */
 928   CP_ID_KIND_QUALIFIED
 929 };
 930
 931
 932 /* The various kinds of C++0x warnings we encounter. */
 933
 934 enum cpp0x_warn_str
 935 {
 936   /* extended initializer lists */
 937   CPP0X_INITIALIZER_LISTS,
 938   /* explicit conversion operators */
 939   CPP0X_EXPLICIT_CONVERSION,
 940   /* variadic templates */
 941   CPP0X_VARIADIC_TEMPLATES,
 942   /* lambda expressions */
 943   CPP0X_LAMBDA_EXPR,
 944   /* C++0x auto */
 945   CPP0X_AUTO,
 946   /* scoped enums */
 947   CPP0X_SCOPED_ENUMS,
 948   /* defaulted and deleted functions */
 949   CPP0X_DEFAULTED_DELETED,
 950   /* inline namespaces */
 951   CPP0X_INLINE_NAMESPACES,
 952   /* override controls, override/final */
 953   CPP0X_OVERRIDE_CONTROLS,
 954   /* non-static data member initializers */
 955   CPP0X_NSDMI,
 956   /* user defined literals */
 957   CPP0X_USER_DEFINED_LITERALS,
 958   /* delegating constructors */
 959   CPP0X_DELEGATING_CTORS,
 960   /* inheriting constructors */
 961   CPP0X_INHERITING_CTORS,
 962   /* C++11 attributes */
 963   CPP0X_ATTRIBUTES,
 964   /* ref-qualified member functions */
 965   CPP0X_REF_QUALIFIER
 966 };
 967
 968 /* The various kinds of operation used by composite_pointer_type. */
 969
 970 enum composite_pointer_operation
 971 {
 972   /* comparison */
 973   CPO_COMPARISON,
 974   /* conversion */
 975   CPO_CONVERSION,
 976   /* conditional expression */
 977   CPO_CONDITIONAL_EXPR
 978 };
 979
 980 /* Possible cases of expression list used by build_x_compound_expr_from_list. */
 981 enum expr_list_kind {
 982   ELK_INIT,             /* initializer */
 983   ELK_MEM_INIT,         /* member initializer */
 984   ELK_FUNC_CAST         /* functional cast */
 985 };
 986
 987 /* Possible cases of implicit bad rhs conversions. */
 988 enum impl_conv_rhs {
 989   ICR_DEFAULT_ARGUMENT, /* default argument */
 990   ICR_CONVERTING,       /* converting */
 991   ICR_INIT,             /* initialization */
 992   ICR_ARGPASS,          /* argument passing */
 993   ICR_RETURN,           /* return */
 994   ICR_ASSIGN            /* assignment */
 995 };
 996
 997 /* Possible cases of implicit or explicit bad conversions to void. */
 998 enum impl_conv_void {
 999   ICV_CAST,            /* (explicit) conversion to void */
1000   ICV_SECOND_OF_COND,  /* second operand of conditional expression */
1001   ICV_THIRD_OF_COND,   /* third operand of conditional expression */
1002   ICV_RIGHT_OF_COMMA,  /* right operand of comma operator */
1003   ICV_LEFT_OF_COMMA,   /* left operand of comma operator */
1004   ICV_STATEMENT,       /* statement */
1005   ICV_THIRD_IN_FOR     /* for increment expression */
1006 };
1007
1008 /* Possible invalid uses of an abstract class that might not have a
1009    specific associated declaration.  */
1010 enum GTY(()) abstract_class_use {
1011   ACU_UNKNOWN,                  /* unknown or decl provided */
1012   ACU_CAST,                     /* cast to abstract class */
1013   ACU_NEW,                      /* new-expression of abstract class */
1014   ACU_THROW,                    /* throw-expression of abstract class */
1015   ACU_CATCH,                    /* catch-parameter of abstract class */
1016   ACU_ARRAY,                    /* array of abstract class */
1017   ACU_RETURN,                   /* return type of abstract class */
1018   ACU_PARM                      /* parameter type of abstract class */
1019 };
1020
1021 /* Macros for access to language-specific slots in an identifier.  */
1022
1023 /* The IDENTIFIER_BINDING is the innermost cxx_binding for the
1024     identifier.  Its PREVIOUS is the next outermost binding.  Each
1025     VALUE field is a DECL for the associated declaration.  Thus,
1026     name lookup consists simply of pulling off the node at the front
1027     of the list (modulo oddities for looking up the names of types,
1028     and such.)  You can use SCOPE field to determine the scope
1029     that bound the name.  */
1030 #define IDENTIFIER_BINDING(NODE) \
1031   (LANG_IDENTIFIER_CAST (NODE)->bindings)
1032
1033 /* TREE_TYPE only indicates on local and class scope the current
1034    type. For namespace scope, the presence of a type in any namespace
1035    is indicated with global_type_node, and the real type behind must
1036    be found through lookup.  */
1037 #define IDENTIFIER_TYPE_VALUE(NODE) identifier_type_value (NODE)
1038 #define REAL_IDENTIFIER_TYPE_VALUE(NODE) TREE_TYPE (NODE)
1039 #define SET_IDENTIFIER_TYPE_VALUE(NODE,TYPE) (TREE_TYPE (NODE) = (TYPE))
1040 #define IDENTIFIER_HAS_TYPE_VALUE(NODE) (IDENTIFIER_TYPE_VALUE (NODE) ? 1 : 0)
1041
1042 /* Kinds of identifiers.  Values are carefully chosen.  */
1043 enum cp_identifier_kind {
1044   cik_normal = 0,       /* Not a special identifier.  */
1045   cik_keyword = 1,      /* A keyword.  */
1046   cik_ctor = 2,         /* Constructor (in-chg, complete or base).  */
1047   cik_dtor = 3,         /* Destructor (in-chg, deleting, complete or
1048                            base).  */
1049   cik_simple_op = 4,    /* Non-assignment operator name.  */
1050   cik_assign_op = 5,    /* An assignment operator name.  */
1051   cik_conv_op = 6,      /* Conversion operator name.  */
1052   cik_reserved_for_udlit = 7,   /* Not yet in use  */
1053   cik_max
1054 };
1055
1056 /* Kind bits.  */
1057 #define IDENTIFIER_KIND_BIT_0(NODE) \
1058   TREE_LANG_FLAG_0 (IDENTIFIER_NODE_CHECK (NODE))
1059 #define IDENTIFIER_KIND_BIT_1(NODE) \
1060   TREE_LANG_FLAG_1 (IDENTIFIER_NODE_CHECK (NODE))
1061 #define IDENTIFIER_KIND_BIT_2(NODE) \
1062   TREE_LANG_FLAG_2 (IDENTIFIER_NODE_CHECK (NODE))
1063
1064 /* Used by various search routines.  */
1065 #define IDENTIFIER_MARKED(NODE) \
1066   TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (NODE))
1067
1068 /* Nonzero if this identifier is used as a virtual function name somewhere
1069    (optimizes searches).  */
1070 #define IDENTIFIER_VIRTUAL_P(NODE) \
1071   TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (NODE))
1072
1073 /* True iff NAME is the DECL_ASSEMBLER_NAME for an entity with vague
1074    linkage which the prelinker has assigned to this translation
1075    unit.  */
1076 #define IDENTIFIER_REPO_CHOSEN(NAME) \
1077   (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (NAME)))
1078
1079 /* True if this identifier is a reserved word.  C_RID_CODE (node) is
1080    then the RID_* value of the keyword.  Value 1.  */
1081 #define IDENTIFIER_KEYWORD_P(NODE)              \
1082   ((!IDENTIFIER_KIND_BIT_2 (NODE))              \
1083    & (!IDENTIFIER_KIND_BIT_1 (NODE))            \
1084    & IDENTIFIER_KIND_BIT_0 (NODE))
1085
1086 /* True if this identifier is the name of a constructor or
1087    destructor.  Value 2 or 3.  */
1088 #define IDENTIFIER_CDTOR_P(NODE)                \
1089   ((!IDENTIFIER_KIND_BIT_2 (NODE))              \
1090    & IDENTIFIER_KIND_BIT_1 (NODE))
1091
1092 /* True if this identifier is the name of a constructor.  Value 2.  */
1093 #define IDENTIFIER_CTOR_P(NODE)                 \
1094   (IDENTIFIER_CDTOR_P(NODE)                     \
1095     & (!IDENTIFIER_KIND_BIT_0 (NODE)))
1096
1097 /* True if this identifier is the name of a destructor.  Value 3.  */
1098 #define IDENTIFIER_DTOR_P(NODE)                 \
1099   (IDENTIFIER_CDTOR_P(NODE)                     \
1100     & IDENTIFIER_KIND_BIT_0 (NODE))
1101
1102 /* True if this identifier is for any operator name (including
1103    conversions).  Value 4, 5, 6 or 7.  */
1104 #define IDENTIFIER_ANY_OP_P(NODE)               \
1105   (IDENTIFIER_KIND_BIT_2 (NODE))
1106
1107 /* True if this identifier is for an overloaded operator. Values 4, 5.  */
1108 #define IDENTIFIER_OVL_OP_P(NODE)               \
1109   (IDENTIFIER_ANY_OP_P (NODE)                   \
1110    & (!IDENTIFIER_KIND_BIT_1 (NODE)))
1111
1112 /* True if this identifier is for any assignment. Values 5.  */
1113 #define IDENTIFIER_ASSIGN_OP_P(NODE)            \
1114   (IDENTIFIER_OVL_OP_P (NODE)                   \
1115    & IDENTIFIER_KIND_BIT_0 (NODE))
1116
1117 /* True if this identifier is the name of a type-conversion
1118    operator.  Value 7.  */
1119 #define IDENTIFIER_CONV_OP_P(NODE)              \
1120   (IDENTIFIER_ANY_OP_P (NODE)                   \
1121    & IDENTIFIER_KIND_BIT_1 (NODE)               \
1122    & (!IDENTIFIER_KIND_BIT_0 (NODE)))
1123
1124 /* True if this identifier is a new or delete operator.  */
1125 #define IDENTIFIER_NEWDEL_OP_P(NODE)            \
1126   (IDENTIFIER_OVL_OP_P (NODE)                   \
1127    && IDENTIFIER_OVL_OP_FLAGS (NODE) & OVL_OP_FLAG_ALLOC)
1128
1129 /* True if this identifier is a new operator.  */
1130 #define IDENTIFIER_NEW_OP_P(NODE)                                       \
1131   (IDENTIFIER_OVL_OP_P (NODE)                                           \
1132    && (IDENTIFIER_OVL_OP_FLAGS (NODE)                                   \
1133        & (OVL_OP_FLAG_ALLOC | OVL_OP_FLAG_DELETE)) == OVL_OP_FLAG_ALLOC)
1134
1135 /* Access a C++-specific index for identifier NODE.
1136    Used to optimize operator mappings etc.  */
1137 #define IDENTIFIER_CP_INDEX(NODE)               \
1138   (IDENTIFIER_NODE_CHECK(NODE)->base.u.bits.address_space)
1139
1140 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
1141 #define C_TYPE_FIELDS_READONLY(TYPE) \
1142   (LANG_TYPE_CLASS_CHECK (TYPE)->fields_readonly)
1143
1144 /* The tokens stored in the default argument.  */
1145
1146 #define DEFARG_TOKENS(NODE) \
1147   (((struct tree_default_arg *)DEFAULT_ARG_CHECK (NODE))->tokens)
1148 #define DEFARG_INSTANTIATIONS(NODE) \
1149   (((struct tree_default_arg *)DEFAULT_ARG_CHECK (NODE))->instantiations)
1150
1151 struct GTY (()) tree_default_arg {
1152   struct tree_common common;
1153   struct cp_token_cache *tokens;
1154   vec<tree, va_gc> *instantiations;
1155 };
1156
1157
1158 #define DEFERRED_NOEXCEPT_PATTERN(NODE) \
1159   (((struct tree_deferred_noexcept *)DEFERRED_NOEXCEPT_CHECK (NODE))->pattern)
1160 #define DEFERRED_NOEXCEPT_ARGS(NODE) \
1161   (((struct tree_deferred_noexcept *)DEFERRED_NOEXCEPT_CHECK (NODE))->args)
1162 #define DEFERRED_NOEXCEPT_SPEC_P(NODE)                          \
1163   ((NODE) && (TREE_PURPOSE (NODE))                              \
1164    && (TREE_CODE (TREE_PURPOSE (NODE)) == DEFERRED_NOEXCEPT))
1165 #define UNEVALUATED_NOEXCEPT_SPEC_P(NODE)                               \
1166   (DEFERRED_NOEXCEPT_SPEC_P (NODE)                                      \
1167    && DEFERRED_NOEXCEPT_PATTERN (TREE_PURPOSE (NODE)) == NULL_TREE)
1168
1169 struct GTY (()) tree_deferred_noexcept {
1170   struct tree_base base;
1171   tree pattern;
1172   tree args;
1173 };
1174
1175
1176 /* The condition associated with the static assertion.  This must be
1177    an integral constant expression.  */
1178 #define STATIC_ASSERT_CONDITION(NODE) \
1179   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->condition)
1180
1181 /* The message associated with the static assertion.  This must be a
1182    string constant, which will be emitted as an error message when the
1183    static assert condition is false.  */
1184 #define STATIC_ASSERT_MESSAGE(NODE) \
1185   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->message)
1186
1187 /* Source location information for a static assertion.  */
1188 #define STATIC_ASSERT_SOURCE_LOCATION(NODE) \
1189   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->location)
1190
1191 struct GTY (()) tree_static_assert {
1192   struct tree_common common;
1193   tree condition;
1194   tree message;
1195   location_t location;
1196 };
1197
1198 struct GTY (()) tree_argument_pack_select {
1199   struct tree_common common;
1200   tree argument_pack;
1201   int index;
1202 };
1203
1204 /* The different kinds of traits that we encounter.  */
1205
1206 enum cp_trait_kind
1207 {
1208   CPTK_BASES,
1209   CPTK_DIRECT_BASES,
1210   CPTK_HAS_NOTHROW_ASSIGN,
1211   CPTK_HAS_NOTHROW_CONSTRUCTOR,
1212   CPTK_HAS_NOTHROW_COPY,
1213   CPTK_HAS_TRIVIAL_ASSIGN,
1214   CPTK_HAS_TRIVIAL_CONSTRUCTOR,
1215   CPTK_HAS_TRIVIAL_COPY,
1216   CPTK_HAS_TRIVIAL_DESTRUCTOR,
1217   CPTK_HAS_UNIQUE_OBJ_REPRESENTATIONS,
1218   CPTK_HAS_VIRTUAL_DESTRUCTOR,
1219   CPTK_IS_ABSTRACT,
1220   CPTK_IS_AGGREGATE,
1221   CPTK_IS_BASE_OF,
1222   CPTK_IS_CLASS,
1223   CPTK_IS_EMPTY,
1224   CPTK_IS_ENUM,
1225   CPTK_IS_FINAL,
1226   CPTK_IS_LITERAL_TYPE,
1227   CPTK_IS_POD,
1228   CPTK_IS_POLYMORPHIC,
1229   CPTK_IS_SAME_AS,
1230   CPTK_IS_STD_LAYOUT,
1231   CPTK_IS_TRIVIAL,
1232   CPTK_IS_TRIVIALLY_ASSIGNABLE,
1233   CPTK_IS_TRIVIALLY_CONSTRUCTIBLE,
1234   CPTK_IS_TRIVIALLY_COPYABLE,
1235   CPTK_IS_UNION,
1236   CPTK_UNDERLYING_TYPE,
1237   CPTK_IS_ASSIGNABLE,
1238   CPTK_IS_CONSTRUCTIBLE
1239 };
1240
1241 /* The types that we are processing.  */
1242 #define TRAIT_EXPR_TYPE1(NODE) \
1243   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->type1)
1244
1245 #define TRAIT_EXPR_TYPE2(NODE) \
1246   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->type2)
1247
1248 /* The specific trait that we are processing.  */
1249 #define TRAIT_EXPR_KIND(NODE) \
1250   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->kind)
1251
1252 struct GTY (()) tree_trait_expr {
1253   struct tree_common common;
1254   tree type1;
1255   tree type2;
1256   enum cp_trait_kind kind;
1257 };
1258
1259 /* Based off of TYPE_UNNAMED_P.  */
1260 #define LAMBDA_TYPE_P(NODE) \
1261   (CLASS_TYPE_P (NODE) && CLASSTYPE_LAMBDA_EXPR (NODE))
1262
1263 /* Test if FUNCTION_DECL is a lambda function.  */
1264 #define LAMBDA_FUNCTION_P(FNDECL)                               \
1265   (DECL_DECLARES_FUNCTION_P (FNDECL)                            \
1266    && DECL_OVERLOADED_OPERATOR_P (FNDECL)                       \
1267    && DECL_OVERLOADED_OPERATOR_IS (FNDECL, CALL_EXPR)           \
1268    && LAMBDA_TYPE_P (CP_DECL_CONTEXT (FNDECL)))
1269
1270 enum cp_lambda_default_capture_mode_type {
1271   CPLD_NONE,
1272   CPLD_COPY,
1273   CPLD_REFERENCE
1274 };
1275
1276 /* The method of default capture, if any.  */
1277 #define LAMBDA_EXPR_DEFAULT_CAPTURE_MODE(NODE) \
1278   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->default_capture_mode)
1279
1280 /* The capture-list, including `this'.  Each capture is stored as a FIELD_DECL
1281  * so that the name, type, and field are all together, whether or not it has
1282  * been added to the lambda's class type.
1283    TREE_LIST:
1284      TREE_PURPOSE: The FIELD_DECL for this capture.
1285      TREE_VALUE: The initializer. This is part of a GNU extension.  */
1286 #define LAMBDA_EXPR_CAPTURE_LIST(NODE) \
1287   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->capture_list)
1288
1289 /* During parsing of the lambda-introducer, the node in the capture-list
1290    that holds the 'this' capture.  During parsing of the body, the
1291    capture proxy for that node.  */
1292 #define LAMBDA_EXPR_THIS_CAPTURE(NODE) \
1293   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->this_capture)
1294
1295 /* Predicate tracking whether `this' is in the effective capture set.  */
1296 #define LAMBDA_EXPR_CAPTURES_THIS_P(NODE) \
1297   LAMBDA_EXPR_THIS_CAPTURE(NODE)
1298
1299 /* Predicate tracking whether the lambda was declared 'mutable'.  */
1300 #define LAMBDA_EXPR_MUTABLE_P(NODE) \
1301   TREE_LANG_FLAG_1 (LAMBDA_EXPR_CHECK (NODE))
1302
1303 /* True iff uses of a const variable capture were optimized away.  */
1304 #define LAMBDA_EXPR_CAPTURE_OPTIMIZED(NODE) \
1305   TREE_LANG_FLAG_2 (LAMBDA_EXPR_CHECK (NODE))
1306
1307 /* True if this TREE_LIST in LAMBDA_EXPR_CAPTURE_LIST is for an explicit
1308    capture.  */
1309 #define LAMBDA_CAPTURE_EXPLICIT_P(NODE) \
1310   TREE_LANG_FLAG_0 (TREE_LIST_CHECK (NODE))
1311
1312 /* The source location of the lambda.  */
1313 #define LAMBDA_EXPR_LOCATION(NODE) \
1314   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->locus)
1315
1316 /* The mangling scope for the lambda: FUNCTION_DECL, PARM_DECL, VAR_DECL,
1317    FIELD_DECL or NULL_TREE.  If this is NULL_TREE, we have no linkage.  */
1318 #define LAMBDA_EXPR_EXTRA_SCOPE(NODE) \
1319   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->extra_scope)
1320
1321 /* If EXTRA_SCOPE, this is the number of the lambda within that scope.  */
1322 #define LAMBDA_EXPR_DISCRIMINATOR(NODE) \
1323   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->discriminator)
1324
1325 /* During parsing of the lambda, a vector of capture proxies which need
1326    to be pushed once we're done processing a nested lambda.  */
1327 #define LAMBDA_EXPR_PENDING_PROXIES(NODE) \
1328   (((struct tree_lambda_expr *)LAMBDA_EXPR_CHECK (NODE))->pending_proxies)
1329
1330 /* The closure type of the lambda, which is also the type of the
1331    LAMBDA_EXPR.  */
1332 #define LAMBDA_EXPR_CLOSURE(NODE) \
1333   (TREE_TYPE (LAMBDA_EXPR_CHECK (NODE)))
1334
1335 struct GTY (()) tree_lambda_expr
1336 {
1337   struct tree_typed typed;
1338   tree capture_list;
1339   tree this_capture;
1340   tree extra_scope;
1341   vec<tree, va_gc> *pending_proxies;
1342   location_t locus;
1343   enum cp_lambda_default_capture_mode_type default_capture_mode;
1344   int discriminator;
1345 };
1346
1347 /* A (typedef,context,usage location) triplet.
1348    It represents a typedef used through a
1349    context at a given source location.
1350    e.g.
1351    struct foo {
1352      typedef int myint;
1353    };
1354
1355    struct bar {
1356     foo::myint v; // #1<-- this location.
1357    };
1358
1359    In bar, the triplet will be (myint, foo, #1).
1360    */
1361 struct GTY(()) qualified_typedef_usage_s {
1362   tree typedef_decl;
1363   tree context;
1364   location_t locus;
1365 };
1366 typedef struct qualified_typedef_usage_s qualified_typedef_usage_t;
1367
1368 /* Non-zero if this template specialization has access violations that
1369    should be rechecked when the function is instantiated outside argument
1370    deduction.  */
1371 #define TINFO_HAS_ACCESS_ERRORS(NODE) \
1372   (TREE_LANG_FLAG_0 (TEMPLATE_INFO_CHECK (NODE)))
1373 #define FNDECL_HAS_ACCESS_ERRORS(NODE) \
1374   (TINFO_HAS_ACCESS_ERRORS (DECL_TEMPLATE_INFO (NODE)))
1375
1376 /* Non-zero if this variable template specialization was specified using a
1377    template-id, so it's a partial or full specialization and not a definition
1378    of the member template of a particular class specialization.  */
1379 #define TINFO_USED_TEMPLATE_ID(NODE) \
1380   (TREE_LANG_FLAG_1 (TEMPLATE_INFO_CHECK (NODE)))
1381
1382 struct GTY(()) tree_template_info {
1383   struct tree_common common;
1384   vec<qualified_typedef_usage_t, va_gc> *typedefs_needing_access_checking;
1385 };
1386
1387 // Constraint information for a C++ declaration. Constraint information is
1388 // comprised of:
1389 //
1390 // - a constraint expression introduced by the template header
1391 // - a constraint expression introduced by a function declarator
1392 // - the associated constraints, which are the conjunction of those,
1393 //   and used for declaration matching
1394 //
1395 // The template and declarator requirements are kept to support pretty
1396 // printing constrained declarations.
1397 struct GTY(()) tree_constraint_info {
1398   struct tree_base base;
1399   tree template_reqs;
1400   tree declarator_reqs;
1401   tree associated_constr;
1402 };
1403
1404 // Require that pointer P is non-null before returning.
1405 template<typename T>
1406 inline T*
1407 check_nonnull (T* p)
1408 {
1409   gcc_assert (p);
1410   return p;
1411 }
1412
1413 // Returns true iff T is non-null and represents constraint info.
1414 inline tree_constraint_info *
1415 check_constraint_info (tree t)
1416 {
1417   if (t && TREE_CODE (t) == CONSTRAINT_INFO)
1418     return (tree_constraint_info *)t;
1419   return NULL;
1420 }
1421
1422 // Access the expression describing the template constraints. This may be
1423 // null if no constraints were introduced in the template parameter list,
1424 // a requirements clause after the template parameter list, or constraints
1425 // through a constrained-type-specifier.
1426 #define CI_TEMPLATE_REQS(NODE) \
1427   check_constraint_info (check_nonnull(NODE))->template_reqs
1428
1429 // Access the expression describing the trailing constraints. This is non-null
1430 // for any implicit instantiation of a constrained declaration. For a
1431 // templated declaration it is non-null only when a trailing requires-clause
1432 // was specified.
1433 #define CI_DECLARATOR_REQS(NODE) \
1434   check_constraint_info (check_nonnull(NODE))->declarator_reqs
1435
1436 // The computed associated constraint expression for a declaration.
1437 #define CI_ASSOCIATED_CONSTRAINTS(NODE) \
1438   check_constraint_info (check_nonnull(NODE))->associated_constr
1439
1440 // Access the logical constraints on the template parameters introduced
1441 // at a given template parameter list level indicated by NODE.
1442 #define TEMPLATE_PARMS_CONSTRAINTS(NODE) \
1443   TREE_TYPE (TREE_LIST_CHECK (NODE))
1444
1445 // Access the logical constraints on the template parameter declaration
1446 // indicated by NODE.
1447 #define TEMPLATE_PARM_CONSTRAINTS(NODE) \
1448   TREE_TYPE (TREE_LIST_CHECK (NODE))
1449
1450 /* Non-zero if the noexcept is present in a compound requirement. */
1451 #define COMPOUND_REQ_NOEXCEPT_P(NODE) \
1452   TREE_LANG_FLAG_0 (TREE_CHECK (NODE, COMPOUND_REQ))
1453
1454 /* The constraints on an 'auto' placeholder type, used in an argument deduction
1455    constraint.  */
1456 #define PLACEHOLDER_TYPE_CONSTRAINTS(NODE) \
1457   DECL_SIZE_UNIT (TYPE_NAME (NODE))
1458
1459 /* The expression evaluated by the predicate constraint. */
1460 #define PRED_CONSTR_EXPR(NODE) \
1461   TREE_OPERAND (TREE_CHECK (NODE, PRED_CONSTR), 0)
1462
1463 /* The concept of a concept check. */
1464 #define CHECK_CONSTR_CONCEPT(NODE) \
1465   TREE_OPERAND (TREE_CHECK (NODE, CHECK_CONSTR), 0)
1466
1467 /* The template arguments of a concept check. */
1468 #define CHECK_CONSTR_ARGS(NODE) \
1469   TREE_OPERAND (TREE_CHECK (NODE, CHECK_CONSTR), 1)
1470
1471 /* The expression validated by the predicate constraint. */
1472 #define EXPR_CONSTR_EXPR(NODE) \
1473   TREE_OPERAND (TREE_CHECK (NODE, EXPR_CONSTR), 0)
1474
1475 /* The type validated by the predicate constraint. */
1476 #define TYPE_CONSTR_TYPE(NODE) \
1477   TREE_OPERAND (TREE_CHECK (NODE, TYPE_CONSTR), 0)
1478
1479 /* In an implicit conversion constraint, the source expression. */
1480 #define ICONV_CONSTR_EXPR(NODE) \
1481   TREE_OPERAND (TREE_CHECK (NODE, ICONV_CONSTR), 0)
1482
1483 /* In an implicit conversion constraint, the target type. */
1484 #define ICONV_CONSTR_TYPE(NODE) \
1485   TREE_OPERAND (TREE_CHECK (NODE, ICONV_CONSTR), 1)
1486
1487 /* In an argument deduction constraint, the source expression. */
1488 #define DEDUCT_CONSTR_EXPR(NODE) \
1489   TREE_OPERAND (TREE_CHECK (NODE, DEDUCT_CONSTR), 0)
1490
1491 /* In an argument deduction constraint, the target type pattern. */
1492 #define DEDUCT_CONSTR_PATTERN(NODE) \
1493   TREE_OPERAND (TREE_CHECK (NODE, DEDUCT_CONSTR), 1)
1494
1495 /* In an argument deduction constraint, the list of placeholder nodes. */
1496 #define DEDUCT_CONSTR_PLACEHOLDER(NODE) \
1497   TREE_OPERAND (TREE_CHECK (NODE, DEDUCT_CONSTR), 2)
1498
1499 /* The expression of an exception constraint. */
1500 #define EXCEPT_CONSTR_EXPR(NODE) \
1501   TREE_OPERAND (TREE_CHECK (NODE, EXCEPT_CONSTR), 0)
1502
1503 /* In a parameterized constraint, the local parameters. */
1504 #define PARM_CONSTR_PARMS(NODE) \
1505   TREE_OPERAND (TREE_CHECK (NODE, PARM_CONSTR), 0)
1506
1507 /* In a parameterized constraint, the operand. */
1508 #define PARM_CONSTR_OPERAND(NODE) \
1509   TREE_OPERAND (TREE_CHECK (NODE, PARM_CONSTR), 1)
1510
1511 /* Whether a PARM_DECL represents a local parameter in a
1512    requires-expression.  */
1513 #define CONSTRAINT_VAR_P(NODE) \
1514   DECL_LANG_FLAG_2 (TREE_CHECK (NODE, PARM_DECL))
1515
1516 /* The concept constraining this constrained template-parameter.  */
1517 #define CONSTRAINED_PARM_CONCEPT(NODE) \
1518   DECL_SIZE_UNIT (TYPE_DECL_CHECK (NODE))
1519 /* Any extra template arguments specified for a constrained
1520    template-parameter.  */
1521 #define CONSTRAINED_PARM_EXTRA_ARGS(NODE) \
1522   DECL_SIZE (TYPE_DECL_CHECK (NODE))
1523 /* The first template parameter of CONSTRAINED_PARM_CONCEPT to be used as a
1524    prototype for the constrained parameter in finish_shorthand_constraint,
1525    attached for convenience.  */
1526 #define CONSTRAINED_PARM_PROTOTYPE(NODE) \
1527   DECL_INITIAL (TYPE_DECL_CHECK (NODE))
1528
1529 enum cp_tree_node_structure_enum {
1530   TS_CP_GENERIC,
1531   TS_CP_IDENTIFIER,
1532   TS_CP_TPI,
1533   TS_CP_PTRMEM,
1534   TS_CP_OVERLOAD,
1535   TS_CP_BASELINK,
1536   TS_CP_TEMPLATE_DECL,
1537   TS_CP_DEFAULT_ARG,
1538   TS_CP_DEFERRED_NOEXCEPT,
1539   TS_CP_STATIC_ASSERT,
1540   TS_CP_ARGUMENT_PACK_SELECT,
1541   TS_CP_TRAIT_EXPR,
1542   TS_CP_LAMBDA_EXPR,
1543   TS_CP_TEMPLATE_INFO,
1544   TS_CP_CONSTRAINT_INFO,
1545   TS_CP_USERDEF_LITERAL
1546 };
1547
1548 /* The resulting tree type.  */
1549 union GTY((desc ("cp_tree_node_structure (&%h)"),
1550        chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node {
1551   union tree_node GTY ((tag ("TS_CP_GENERIC"),
1552                         desc ("tree_node_structure (&%h)"))) generic;
1553   struct template_parm_index GTY ((tag ("TS_CP_TPI"))) tpi;
1554   struct ptrmem_cst GTY ((tag ("TS_CP_PTRMEM"))) ptrmem;
1555   struct tree_overload GTY ((tag ("TS_CP_OVERLOAD"))) overload;
1556   struct tree_baselink GTY ((tag ("TS_CP_BASELINK"))) baselink;
1557   struct tree_template_decl GTY ((tag ("TS_CP_TEMPLATE_DECL"))) template_decl;
1558   struct tree_default_arg GTY ((tag ("TS_CP_DEFAULT_ARG"))) default_arg;
1559   struct tree_deferred_noexcept GTY ((tag ("TS_CP_DEFERRED_NOEXCEPT"))) deferred_noexcept;
1560   struct lang_identifier GTY ((tag ("TS_CP_IDENTIFIER"))) identifier;
1561   struct tree_static_assert GTY ((tag ("TS_CP_STATIC_ASSERT")))
1562     static_assertion;
1563   struct tree_argument_pack_select GTY ((tag ("TS_CP_ARGUMENT_PACK_SELECT")))
1564     argument_pack_select;
1565   struct tree_trait_expr GTY ((tag ("TS_CP_TRAIT_EXPR")))
1566     trait_expression;
1567   struct tree_lambda_expr GTY ((tag ("TS_CP_LAMBDA_EXPR")))
1568     lambda_expression;
1569   struct tree_template_info GTY ((tag ("TS_CP_TEMPLATE_INFO")))
1570     template_info;
1571   struct tree_constraint_info GTY ((tag ("TS_CP_CONSTRAINT_INFO")))
1572     constraint_info;
1573   struct tree_userdef_literal GTY ((tag ("TS_CP_USERDEF_LITERAL")))
1574     userdef_literal;
1575 };
1576
1577 \f
1578 /* Global state.  */
1579
1580 struct GTY(()) saved_scope {
1581   vec<cxx_saved_binding, va_gc> *old_bindings;
1582   tree old_namespace;
1583   vec<tree, va_gc> *decl_ns_list;
1584   tree class_name;
1585   tree class_type;
1586   tree access_specifier;
1587   tree function_decl;
1588   vec<tree, va_gc> *lang_base;
1589   tree lang_name;
1590   tree template_parms;
1591   cp_binding_level *x_previous_class_level;
1592   tree x_saved_tree;
1593
1594   /* Only used for uses of this in trailing return type.  */
1595   tree x_current_class_ptr;
1596   tree x_current_class_ref;
1597
1598   int x_processing_template_decl;
1599   int x_processing_specialization;
1600   BOOL_BITFIELD x_processing_explicit_instantiation : 1;
1601   BOOL_BITFIELD need_pop_function_context : 1;
1602
1603 /* Nonzero if we are parsing the discarded statement of a constexpr
1604    if-statement.  */
1605   BOOL_BITFIELD discarded_stmt : 1;
1606
1607   int unevaluated_operand;
1608   int inhibit_evaluation_warnings;
1609   int noexcept_operand;
1610   /* If non-zero, implicit "omp declare target" attribute is added into the
1611      attribute lists.  */
1612   int omp_declare_target_attribute;
1613
1614   struct stmt_tree_s x_stmt_tree;
1615
1616   cp_binding_level *class_bindings;
1617   cp_binding_level *bindings;
1618
1619   hash_map<tree, tree> *GTY((skip)) x_local_specializations;
1620
1621   struct saved_scope *prev;
1622 };
1623
1624 extern GTY(()) struct saved_scope *scope_chain;
1625
1626 /* The current open namespace.  */
1627
1628 #define current_namespace scope_chain->old_namespace
1629
1630 /* The stack for namespaces of current declarations.  */
1631
1632 #define decl_namespace_list scope_chain->decl_ns_list
1633
1634 /* IDENTIFIER_NODE: name of current class */
1635
1636 #define current_class_name scope_chain->class_name
1637
1638 /* _TYPE: the type of the current class */
1639
1640 #define current_class_type scope_chain->class_type
1641
1642 /* When parsing a class definition, the access specifier most recently
1643    given by the user, or, if no access specifier was given, the
1644    default value appropriate for the kind of class (i.e., struct,
1645    class, or union).  */
1646
1647 #define current_access_specifier scope_chain->access_specifier
1648
1649 /* Pointer to the top of the language name stack.  */
1650
1651 #define current_lang_base scope_chain->lang_base
1652 #define current_lang_name scope_chain->lang_name
1653
1654 /* When parsing a template declaration, a TREE_LIST represents the
1655    active template parameters.  Each node in the list represents one
1656    level of template parameters.  The innermost level is first in the
1657    list.  The depth of each level is stored as an INTEGER_CST in the
1658    TREE_PURPOSE of each node.  The parameters for that level are
1659    stored in the TREE_VALUE.  */
1660
1661 #define current_template_parms scope_chain->template_parms
1662
1663 #define processing_template_decl scope_chain->x_processing_template_decl
1664 #define processing_specialization scope_chain->x_processing_specialization
1665 #define processing_explicit_instantiation scope_chain->x_processing_explicit_instantiation
1666
1667 #define in_discarded_stmt scope_chain->discarded_stmt
1668
1669 /* RAII sentinel to handle clearing processing_template_decl and restoring
1670    it when done.  */
1671
1672 struct processing_template_decl_sentinel
1673 {
1674   int saved;
1675   processing_template_decl_sentinel (bool reset = true)
1676     : saved (processing_template_decl)
1677   {
1678     if (reset)
1679       processing_template_decl = 0;
1680   }
1681   ~processing_template_decl_sentinel()
1682   {
1683     processing_template_decl = saved;
1684   }
1685 };
1686
1687 /* RAII sentinel to disable certain warnings during template substitution
1688    and elsewhere.  */
1689
1690 struct warning_sentinel
1691 {
1692   int &flag;
1693   int val;
1694   warning_sentinel(int& flag, bool suppress=true)
1695     : flag(flag), val(flag) { if (suppress) flag = 0; }
1696   ~warning_sentinel() { flag = val; }
1697 };
1698
1699 /* RAII sentinel that saves the value of a variable, optionally
1700    overrides it right away, and restores its value when the sentinel
1701    id destructed.  */
1702
1703 template <typename T>
1704 class temp_override
1705 {
1706   T& overridden_variable;
1707   T saved_value;
1708 public:
1709   temp_override(T& var) : overridden_variable (var), saved_value (var) {}
1710   temp_override(T& var, T overrider)
1711     : overridden_variable (var), saved_value (var)
1712   {
1713     overridden_variable = overrider;
1714   }
1715   ~temp_override() { overridden_variable = saved_value; }
1716 };
1717
1718 /* The cached class binding level, from the most recently exited
1719    class, or NULL if none.  */
1720
1721 #define previous_class_level scope_chain->x_previous_class_level
1722
1723 /* A map from local variable declarations in the body of the template
1724    presently being instantiated to the corresponding instantiated
1725    local variables.  */
1726
1727 #define local_specializations scope_chain->x_local_specializations
1728
1729 /* Nonzero if we are parsing the operand of a noexcept operator.  */
1730
1731 #define cp_noexcept_operand scope_chain->noexcept_operand
1732
1733 /* A list of private types mentioned, for deferred access checking.  */
1734
1735 struct GTY((for_user)) cxx_int_tree_map {
1736   unsigned int uid;
1737   tree to;
1738 };
1739
1740 struct cxx_int_tree_map_hasher : ggc_ptr_hash<cxx_int_tree_map>
1741 {
1742   static hashval_t hash (cxx_int_tree_map *);
1743   static bool equal (cxx_int_tree_map *, cxx_int_tree_map *);
1744 };
1745
1746 struct named_label_entry; /* Defined in decl.c.  */
1747
1748 struct named_label_hash : ggc_remove <named_label_entry *>
1749 {
1750   typedef named_label_entry *value_type;
1751   typedef tree compare_type; /* An identifier.  */
1752
1753   inline static hashval_t hash (value_type);
1754   inline static bool equal (const value_type, compare_type);
1755
1756   inline static void mark_empty (value_type &p) {p = NULL;}
1757   inline static bool is_empty (value_type p) {return !p;}
1758
1759   /* Nothing is deletable.  Everything is insertable.  */
1760   inline static bool is_deleted (value_type) { return false; }
1761   inline static void mark_deleted (value_type) { gcc_unreachable (); }
1762 };
1763
1764 /* Global state pertinent to the current function.  */
1765
1766 struct GTY(()) language_function {
1767   struct c_language_function base;
1768
1769   tree x_cdtor_label;
1770   tree x_current_class_ptr;
1771   tree x_current_class_ref;
1772   tree x_eh_spec_block;
1773   tree x_in_charge_parm;
1774   tree x_vtt_parm;
1775   tree x_return_value;
1776   tree x_auto_return_pattern;
1777
1778   BOOL_BITFIELD returns_value : 1;
1779   BOOL_BITFIELD returns_null : 1;
1780   BOOL_BITFIELD returns_abnormally : 1;
1781   BOOL_BITFIELD infinite_loop: 1;
1782   BOOL_BITFIELD x_in_function_try_handler : 1;
1783   BOOL_BITFIELD x_in_base_initializer : 1;
1784
1785   /* True if this function can throw an exception.  */
1786   BOOL_BITFIELD can_throw : 1;
1787
1788   BOOL_BITFIELD invalid_constexpr : 1;
1789
1790   hash_table<named_label_hash> *x_named_labels;
1791
1792   cp_binding_level *bindings;
1793   vec<tree, va_gc> *x_local_names;
1794   /* Tracking possibly infinite loops.  This is a vec<tree> only because
1795      vec<bool> doesn't work with gtype.  */
1796   vec<tree, va_gc> *infinite_loops;
1797   hash_table<cxx_int_tree_map_hasher> *extern_decl_map;
1798 };
1799
1800 /* The current C++-specific per-function global variables.  */
1801
1802 #define cp_function_chain (cfun->language)
1803
1804 /* In a constructor destructor, the point at which all derived class
1805    destroying/construction has been done.  I.e., just before a
1806    constructor returns, or before any base class destroying will be done
1807    in a destructor.  */
1808
1809 #define cdtor_label cp_function_chain->x_cdtor_label
1810
1811 /* When we're processing a member function, current_class_ptr is the
1812    PARM_DECL for the `this' pointer.  The current_class_ref is an
1813    expression for `*this'.  */
1814
1815 #define current_class_ptr                       \
1816   (*(cfun && cp_function_chain                  \
1817      ? &cp_function_chain->x_current_class_ptr  \
1818      : &scope_chain->x_current_class_ptr))
1819 #define current_class_ref                       \
1820   (*(cfun && cp_function_chain                  \
1821      ? &cp_function_chain->x_current_class_ref  \
1822      : &scope_chain->x_current_class_ref))
1823
1824 /* The EH_SPEC_BLOCK for the exception-specifiers for the current
1825    function, if any.  */
1826
1827 #define current_eh_spec_block cp_function_chain->x_eh_spec_block
1828
1829 /* The `__in_chrg' parameter for the current function.  Only used for
1830    constructors and destructors.  */
1831
1832 #define current_in_charge_parm cp_function_chain->x_in_charge_parm
1833
1834 /* The `__vtt_parm' parameter for the current function.  Only used for
1835    constructors and destructors.  */
1836
1837 #define current_vtt_parm cp_function_chain->x_vtt_parm
1838
1839 /* Set to 0 at beginning of a function definition, set to 1 if
1840    a return statement that specifies a return value is seen.  */
1841
1842 #define current_function_returns_value cp_function_chain->returns_value
1843
1844 /* Set to 0 at beginning of a function definition, set to 1 if
1845    a return statement with no argument is seen.  */
1846
1847 #define current_function_returns_null cp_function_chain->returns_null
1848
1849 /* Set to 0 at beginning of a function definition, set to 1 if
1850    a call to a noreturn function is seen.  */
1851
1852 #define current_function_returns_abnormally \
1853   cp_function_chain->returns_abnormally
1854
1855 /* Set to 0 at beginning of a function definition, set to 1 if we see an
1856    obvious infinite loop.  This can have false positives and false
1857    negatives, so it should only be used as a heuristic.  */
1858
1859 #define current_function_infinite_loop cp_function_chain->infinite_loop
1860
1861 /* Nonzero if we are processing a base initializer.  Zero elsewhere.  */
1862 #define in_base_initializer cp_function_chain->x_in_base_initializer
1863
1864 #define in_function_try_handler cp_function_chain->x_in_function_try_handler
1865
1866 /* Expression always returned from function, or error_mark_node
1867    otherwise, for use by the automatic named return value optimization.  */
1868
1869 #define current_function_return_value \
1870   (cp_function_chain->x_return_value)
1871
1872 /* A type involving 'auto' to be used for return type deduction.  */
1873
1874 #define current_function_auto_return_pattern \
1875   (cp_function_chain->x_auto_return_pattern)
1876
1877 /* In parser.c.  */
1878 extern tree cp_literal_operator_id (const char *);
1879
1880 #define NON_ERROR(NODE) ((NODE) == error_mark_node ? NULL_TREE : (NODE))
1881
1882 /* TRUE if a tree code represents a statement.  */
1883 extern bool statement_code_p[MAX_TREE_CODES];
1884
1885 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
1886
1887 enum languages { lang_c, lang_cplusplus };
1888
1889 /* Macros to make error reporting functions' lives easier.  */
1890 #define TYPE_LINKAGE_IDENTIFIER(NODE) \
1891   (TYPE_IDENTIFIER (TYPE_MAIN_VARIANT (NODE)))
1892 #define TYPE_NAME_STRING(NODE) (IDENTIFIER_POINTER (TYPE_IDENTIFIER (NODE)))
1893 #define TYPE_NAME_LENGTH(NODE) (IDENTIFIER_LENGTH (TYPE_IDENTIFIER (NODE)))
1894
1895 /* Nonzero if NODE has no name for linkage purposes.  */
1896 #define TYPE_UNNAMED_P(NODE) \
1897   (OVERLOAD_TYPE_P (NODE) && anon_aggrname_p (TYPE_LINKAGE_IDENTIFIER (NODE)))
1898
1899 /* The _DECL for this _TYPE.  */
1900 #define TYPE_MAIN_DECL(NODE) (TYPE_STUB_DECL (TYPE_MAIN_VARIANT (NODE)))
1901
1902 /* Nonzero if T is a type that could resolve to any kind of concrete type
1903    at instantiation time.  */
1904 #define WILDCARD_TYPE_P(T)                              \
1905   (TREE_CODE (T) == TEMPLATE_TYPE_PARM                  \
1906    || TREE_CODE (T) == TYPENAME_TYPE                    \
1907    || TREE_CODE (T) == TYPEOF_TYPE                      \
1908    || TREE_CODE (T) == BOUND_TEMPLATE_TEMPLATE_PARM     \
1909    || TREE_CODE (T) == DECLTYPE_TYPE)
1910
1911 /* Nonzero if T is a class (or struct or union) type.  Also nonzero
1912    for template type parameters, typename types, and instantiated
1913    template template parameters.  Keep these checks in ascending code
1914    order.  */
1915 #define MAYBE_CLASS_TYPE_P(T) (WILDCARD_TYPE_P (T) || CLASS_TYPE_P (T))
1916
1917 /* Set CLASS_TYPE_P for T to VAL.  T must be a class, struct, or
1918    union type.  */
1919 #define SET_CLASS_TYPE_P(T, VAL) \
1920   (TYPE_LANG_FLAG_5 (RECORD_OR_UNION_CHECK (T)) = (VAL))
1921
1922 /* Nonzero if T is a class type.  Zero for template type parameters,
1923    typename types, and so forth.  */
1924 #define CLASS_TYPE_P(T) \
1925   (RECORD_OR_UNION_CODE_P (TREE_CODE (T)) && TYPE_LANG_FLAG_5 (T))
1926
1927 /* Nonzero if T is a class type but not an union.  */
1928 #define NON_UNION_CLASS_TYPE_P(T) \
1929   (TREE_CODE (T) == RECORD_TYPE && TYPE_LANG_FLAG_5 (T))
1930
1931 /* Keep these checks in ascending code order.  */
1932 #define RECORD_OR_UNION_CODE_P(T)       \
1933   ((T) == RECORD_TYPE || (T) == UNION_TYPE)
1934 #define OVERLOAD_TYPE_P(T) \
1935   (CLASS_TYPE_P (T) || TREE_CODE (T) == ENUMERAL_TYPE)
1936
1937 /* True if this type is dependent.  This predicate is only valid if
1938    TYPE_DEPENDENT_P_VALID is true.  */
1939 #define TYPE_DEPENDENT_P(NODE) TYPE_LANG_FLAG_0 (NODE)
1940
1941 /* True if dependent_type_p has been called for this type, with the
1942    result that TYPE_DEPENDENT_P is valid.  */
1943 #define TYPE_DEPENDENT_P_VALID(NODE) TYPE_LANG_FLAG_6(NODE)
1944
1945 /* Nonzero if this type is const-qualified.  */
1946 #define CP_TYPE_CONST_P(NODE)                           \
1947   ((cp_type_quals (NODE) & TYPE_QUAL_CONST) != 0)
1948
1949 /* Nonzero if this type is volatile-qualified.  */
1950 #define CP_TYPE_VOLATILE_P(NODE)                        \
1951   ((cp_type_quals (NODE) & TYPE_QUAL_VOLATILE) != 0)
1952
1953 /* Nonzero if this type is restrict-qualified.  */
1954 #define CP_TYPE_RESTRICT_P(NODE)                        \
1955   ((cp_type_quals (NODE) & TYPE_QUAL_RESTRICT) != 0)
1956
1957 /* Nonzero if this type is const-qualified, but not
1958    volatile-qualified.  Other qualifiers are ignored.  This macro is
1959    used to test whether or not it is OK to bind an rvalue to a
1960    reference.  */
1961 #define CP_TYPE_CONST_NON_VOLATILE_P(NODE)                              \
1962   ((cp_type_quals (NODE) & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE))      \
1963    == TYPE_QUAL_CONST)
1964
1965 #define FUNCTION_ARG_CHAIN(NODE) \
1966   TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (NODE)))
1967
1968 /* Given a FUNCTION_DECL, returns the first TREE_LIST out of TYPE_ARG_TYPES
1969    which refers to a user-written parameter.  */
1970 #define FUNCTION_FIRST_USER_PARMTYPE(NODE) \
1971   skip_artificial_parms_for ((NODE), TYPE_ARG_TYPES (TREE_TYPE (NODE)))
1972
1973 /* Similarly, but for DECL_ARGUMENTS.  */
1974 #define FUNCTION_FIRST_USER_PARM(NODE) \
1975   skip_artificial_parms_for ((NODE), DECL_ARGUMENTS (NODE))
1976
1977 /* Nonzero iff TYPE is derived from PARENT. Ignores accessibility and
1978    ambiguity issues.  */
1979 #define DERIVED_FROM_P(PARENT, TYPE) \
1980   (lookup_base ((TYPE), (PARENT), ba_any, NULL, tf_none) != NULL_TREE)
1981
1982 /* Gives the visibility specification for a class type.  */
1983 #define CLASSTYPE_VISIBILITY(TYPE)              \
1984         DECL_VISIBILITY (TYPE_MAIN_DECL (TYPE))
1985 #define CLASSTYPE_VISIBILITY_SPECIFIED(TYPE)    \
1986         DECL_VISIBILITY_SPECIFIED (TYPE_MAIN_DECL (TYPE))
1987
1988 struct GTY (()) tree_pair_s {
1989   tree purpose;
1990   tree value;
1991 };
1992 typedef tree_pair_s *tree_pair_p;
1993
1994 /* This structure provides additional information above and beyond
1995    what is provide in the ordinary tree_type.  In the past, we used it
1996    for the types of class types, template parameters types, typename
1997    types, and so forth.  However, there can be many (tens to hundreds
1998    of thousands) of template parameter types in a compilation, and
1999    there's no need for this additional information in that case.
2000    Therefore, we now use this data structure only for class types.
2001
2002    In the past, it was thought that there would be relatively few
2003    class types.  However, in the presence of heavy use of templates,
2004    many (i.e., thousands) of classes can easily be generated.
2005    Therefore, we should endeavor to keep the size of this structure to
2006    a minimum.  */
2007 struct GTY(()) lang_type {
2008   unsigned char align;
2009
2010   unsigned has_type_conversion : 1;
2011   unsigned has_copy_ctor : 1;
2012   unsigned has_default_ctor : 1;
2013   unsigned const_needs_init : 1;
2014   unsigned ref_needs_init : 1;
2015   unsigned has_const_copy_assign : 1;
2016   unsigned use_template : 2;
2017
2018   unsigned has_mutable : 1;
2019   unsigned com_interface : 1;
2020   unsigned non_pod_class : 1;
2021   unsigned nearly_empty_p : 1;
2022   unsigned user_align : 1;
2023   unsigned has_copy_assign : 1;
2024   unsigned has_new : 1;
2025   unsigned has_array_new : 1;
2026
2027   unsigned gets_delete : 2;
2028   unsigned interface_only : 1;
2029   unsigned interface_unknown : 1;
2030   unsigned contains_empty_class_p : 1;
2031   unsigned anon_aggr : 1;
2032   unsigned non_zero_init : 1;
2033   unsigned empty_p : 1;
2034   /* 32 bits allocated.  */
2035
2036   unsigned vec_new_uses_cookie : 1;
2037   unsigned declared_class : 1;
2038   unsigned diamond_shaped : 1;
2039   unsigned repeated_base : 1;
2040   unsigned being_defined : 1;
2041   unsigned debug_requested : 1;
2042   unsigned fields_readonly : 1;
2043   unsigned ptrmemfunc_flag : 1;
2044
2045   unsigned was_anonymous : 1;
2046   unsigned lazy_default_ctor : 1;
2047   unsigned lazy_copy_ctor : 1;
2048   unsigned lazy_copy_assign : 1;
2049   unsigned lazy_destructor : 1;
2050   unsigned has_const_copy_ctor : 1;
2051   unsigned has_complex_copy_ctor : 1;
2052   unsigned has_complex_copy_assign : 1;
2053
2054   unsigned non_aggregate : 1;
2055   unsigned has_complex_dflt : 1;
2056   unsigned has_list_ctor : 1;
2057   unsigned non_std_layout : 1;
2058   unsigned is_literal : 1;
2059   unsigned lazy_move_ctor : 1;
2060   unsigned lazy_move_assign : 1;
2061   unsigned has_complex_move_ctor : 1;
2062
2063   unsigned has_complex_move_assign : 1;
2064   unsigned has_constexpr_ctor : 1;
2065   unsigned unique_obj_representations : 1;
2066   unsigned unique_obj_representations_set : 1;
2067
2068   /* When adding a flag here, consider whether or not it ought to
2069      apply to a template instance if it applies to the template.  If
2070      so, make sure to copy it in instantiate_class_template!  */
2071
2072   /* There are some bits left to fill out a 32-bit word.  Keep track
2073      of this by updating the size of this bitfield whenever you add or
2074      remove a flag.  */
2075   unsigned dummy : 4;
2076
2077   tree primary_base;
2078   vec<tree_pair_s, va_gc> *vcall_indices;
2079   tree vtables;
2080   tree typeinfo_var;
2081   vec<tree, va_gc> *vbases;
2082   binding_table nested_udts;
2083   tree as_base;
2084   vec<tree, va_gc> *pure_virtuals;
2085   tree friend_classes;
2086   vec<tree, va_gc> * GTY((reorder ("resort_type_member_vec"))) members;
2087   tree key_method;
2088   tree decl_list;
2089   tree befriending_classes;
2090   /* In a RECORD_TYPE, information specific to Objective-C++, such
2091      as a list of adopted protocols or a pointer to a corresponding
2092      @interface.  See objc/objc-act.h for details.  */
2093   tree objc_info;
2094   /* FIXME reuse another field?  */
2095   tree lambda_expr;
2096 };
2097
2098 /* We used to have a variant type for lang_type.  Keep the name of the
2099    checking accessor for the sole survivor.  */
2100 #define LANG_TYPE_CLASS_CHECK(NODE) (TYPE_LANG_SPECIFIC (NODE))
2101
2102 /* Nonzero for _CLASSTYPE means that operator delete is defined.  */
2103 #define TYPE_GETS_DELETE(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->gets_delete)
2104 #define TYPE_GETS_REG_DELETE(NODE) (TYPE_GETS_DELETE (NODE) & 1)
2105
2106 /* Nonzero if `new NODE[x]' should cause the allocation of extra
2107    storage to indicate how many array elements are in use.  */
2108 #define TYPE_VEC_NEW_USES_COOKIE(NODE)                  \
2109   (CLASS_TYPE_P (NODE)                                  \
2110    && LANG_TYPE_CLASS_CHECK (NODE)->vec_new_uses_cookie)
2111
2112 /* Nonzero means that this _CLASSTYPE node defines ways of converting
2113    itself to other types.  */
2114 #define TYPE_HAS_CONVERSION(NODE) \
2115   (LANG_TYPE_CLASS_CHECK (NODE)->has_type_conversion)
2116
2117 /* Nonzero means that NODE (a class type) has a default constructor --
2118    but that it has not yet been declared.  */
2119 #define CLASSTYPE_LAZY_DEFAULT_CTOR(NODE) \
2120   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_default_ctor)
2121
2122 /* Nonzero means that NODE (a class type) has a copy constructor --
2123    but that it has not yet been declared.  */
2124 #define CLASSTYPE_LAZY_COPY_CTOR(NODE) \
2125   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_copy_ctor)
2126
2127 /* Nonzero means that NODE (a class type) has a move constructor --
2128    but that it has not yet been declared.  */
2129 #define CLASSTYPE_LAZY_MOVE_CTOR(NODE) \
2130   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_move_ctor)
2131
2132 /* Nonzero means that NODE (a class type) has an assignment operator
2133    -- but that it has not yet been declared.  */
2134 #define CLASSTYPE_LAZY_COPY_ASSIGN(NODE) \
2135   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_copy_assign)
2136
2137 /* Nonzero means that NODE (a class type) has an assignment operator
2138    -- but that it has not yet been declared.  */
2139 #define CLASSTYPE_LAZY_MOVE_ASSIGN(NODE) \
2140   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_move_assign)
2141
2142 /* Nonzero means that NODE (a class type) has a destructor -- but that
2143    it has not yet been declared.  */
2144 #define CLASSTYPE_LAZY_DESTRUCTOR(NODE) \
2145   (LANG_TYPE_CLASS_CHECK (NODE)->lazy_destructor)
2146
2147 /* Nonzero means that NODE (a class type) is final */
2148 #define CLASSTYPE_FINAL(NODE) \
2149   TYPE_FINAL_P (NODE)
2150
2151
2152 /* Nonzero means that this _CLASSTYPE node overloads operator=(X&).  */
2153 #define TYPE_HAS_COPY_ASSIGN(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_copy_assign)
2154
2155 /* True iff the class type NODE has an "operator =" whose parameter
2156    has a parameter of type "const X&".  */
2157 #define TYPE_HAS_CONST_COPY_ASSIGN(NODE) \
2158   (LANG_TYPE_CLASS_CHECK (NODE)->has_const_copy_assign)
2159
2160 /* Nonzero means that this _CLASSTYPE node has an X(X&) constructor.  */
2161 #define TYPE_HAS_COPY_CTOR(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_copy_ctor)
2162 #define TYPE_HAS_CONST_COPY_CTOR(NODE) \
2163   (LANG_TYPE_CLASS_CHECK (NODE)->has_const_copy_ctor)
2164
2165 /* Nonzero if this class has an X(initializer_list<T>) constructor.  */
2166 #define TYPE_HAS_LIST_CTOR(NODE) \
2167   (LANG_TYPE_CLASS_CHECK (NODE)->has_list_ctor)
2168
2169 /* Nonzero if this class has a constexpr constructor other than a copy/move
2170    constructor.  Note that a class can have constexpr constructors for
2171    static initialization even if it isn't a literal class.  */
2172 #define TYPE_HAS_CONSTEXPR_CTOR(NODE) \
2173   (LANG_TYPE_CLASS_CHECK (NODE)->has_constexpr_ctor)
2174
2175 /* Nonzero if this class defines an overloaded operator new.  (An
2176    operator new [] doesn't count.)  */
2177 #define TYPE_HAS_NEW_OPERATOR(NODE) \
2178   (LANG_TYPE_CLASS_CHECK (NODE)->has_new)
2179
2180 /* Nonzero if this class defines an overloaded operator new[].  */
2181 #define TYPE_HAS_ARRAY_NEW_OPERATOR(NODE) \
2182   (LANG_TYPE_CLASS_CHECK (NODE)->has_array_new)
2183
2184 /* Nonzero means that this type is being defined.  I.e., the left brace
2185    starting the definition of this type has been seen.  */
2186 #define TYPE_BEING_DEFINED(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->being_defined)
2187
2188 /* Nonzero means that this type is either complete or being defined, so we
2189    can do lookup in it.  */
2190 #define COMPLETE_OR_OPEN_TYPE_P(NODE) \
2191   (COMPLETE_TYPE_P (NODE) || (CLASS_TYPE_P (NODE) && TYPE_BEING_DEFINED (NODE)))
2192
2193 /* Mark bits for repeated base checks.  */
2194 #define TYPE_MARKED_P(NODE) TREE_LANG_FLAG_6 (TYPE_CHECK (NODE))
2195
2196 /* Nonzero if the class NODE has multiple paths to the same (virtual)
2197    base object.  */
2198 #define CLASSTYPE_DIAMOND_SHAPED_P(NODE) \
2199   (LANG_TYPE_CLASS_CHECK(NODE)->diamond_shaped)
2200
2201 /* Nonzero if the class NODE has multiple instances of the same base
2202    type.  */
2203 #define CLASSTYPE_REPEATED_BASE_P(NODE) \
2204   (LANG_TYPE_CLASS_CHECK(NODE)->repeated_base)
2205
2206 /* The member function with which the vtable will be emitted:
2207    the first noninline non-pure-virtual member function.  NULL_TREE
2208    if there is no key function or if this is a class template */
2209 #define CLASSTYPE_KEY_METHOD(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->key_method)
2210
2211 /* Vector of members.  During definition, it is unordered and only
2212    member functions are present.  After completion it is sorted and
2213    contains both member functions and non-functions.  STAT_HACK is
2214    involved to preserve oneslot per name invariant.  */
2215 #define CLASSTYPE_MEMBER_VEC(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->members)
2216
2217 /* For class templates, this is a TREE_LIST of all member data,
2218    functions, types, and friends in the order of declaration.
2219    The TREE_PURPOSE of each TREE_LIST is NULL_TREE for a friend,
2220    and the RECORD_TYPE for the class template otherwise.  */
2221 #define CLASSTYPE_DECL_LIST(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->decl_list)
2222
2223 /* A FUNCTION_DECL or OVERLOAD for the constructors for NODE.  These
2224    are the constructors that take an in-charge parameter.  */
2225 #define CLASSTYPE_CONSTRUCTORS(NODE) \
2226   (get_class_binding_direct (NODE, ctor_identifier))
2227
2228 /* A FUNCTION_DECL for the destructor for NODE.  This is the
2229    destructors that take an in-charge parameter.  If
2230    CLASSTYPE_LAZY_DESTRUCTOR is true, then this entry will be NULL
2231    until the destructor is created with lazily_declare_fn.  */
2232 #define CLASSTYPE_DESTRUCTOR(NODE) \
2233   (get_class_binding_direct (NODE, dtor_identifier))
2234
2235 /* A dictionary of the nested user-defined-types (class-types, or enums)
2236    found within this class.  This table includes nested member class
2237    templates.  */
2238 #define CLASSTYPE_NESTED_UTDS(NODE) \
2239    (LANG_TYPE_CLASS_CHECK (NODE)->nested_udts)
2240
2241 /* Nonzero if NODE has a primary base class, i.e., a base class with
2242    which it shares the virtual function table pointer.  */
2243 #define CLASSTYPE_HAS_PRIMARY_BASE_P(NODE) \
2244   (CLASSTYPE_PRIMARY_BINFO (NODE) != NULL_TREE)
2245
2246 /* If non-NULL, this is the binfo for the primary base class, i.e.,
2247    the base class which contains the virtual function table pointer
2248    for this class.  */
2249 #define CLASSTYPE_PRIMARY_BINFO(NODE) \
2250   (LANG_TYPE_CLASS_CHECK (NODE)->primary_base)
2251
2252 /* A vector of BINFOs for the direct and indirect virtual base classes
2253    that this type uses in a post-order depth-first left-to-right
2254    order.  (In other words, these bases appear in the order that they
2255    should be initialized.)  */
2256 #define CLASSTYPE_VBASECLASSES(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->vbases)
2257
2258 /* The type corresponding to NODE when NODE is used as a base class,
2259    i.e., NODE without virtual base classes or tail padding.  */
2260 #define CLASSTYPE_AS_BASE(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->as_base)
2261
2262 /* True iff NODE is the CLASSTYPE_AS_BASE version of some type.  */
2263 #define IS_FAKE_BASE_TYPE(NODE)                                 \
2264   (TREE_CODE (NODE) == RECORD_TYPE                              \
2265    && TYPE_CONTEXT (NODE) && CLASS_TYPE_P (TYPE_CONTEXT (NODE)) \
2266    && CLASSTYPE_AS_BASE (TYPE_CONTEXT (NODE)) == (NODE))
2267
2268 /* These are the size and alignment of the type without its virtual
2269    base classes, for when we use this type as a base itself.  */
2270 #define CLASSTYPE_SIZE(NODE) TYPE_SIZE (CLASSTYPE_AS_BASE (NODE))
2271 #define CLASSTYPE_SIZE_UNIT(NODE) TYPE_SIZE_UNIT (CLASSTYPE_AS_BASE (NODE))
2272 #define CLASSTYPE_ALIGN(NODE) TYPE_ALIGN (CLASSTYPE_AS_BASE (NODE))
2273 #define CLASSTYPE_USER_ALIGN(NODE) TYPE_USER_ALIGN (CLASSTYPE_AS_BASE (NODE))
2274
2275 /* The alignment of NODE, without its virtual bases, in bytes.  */
2276 #define CLASSTYPE_ALIGN_UNIT(NODE) \
2277   (CLASSTYPE_ALIGN (NODE) / BITS_PER_UNIT)
2278
2279 /* A vec<tree> of virtual functions which cannot be inherited by
2280    derived classes.  When deriving from this type, the derived
2281    class must provide its own definition for each of these functions.  */
2282 #define CLASSTYPE_PURE_VIRTUALS(NODE) \
2283   (LANG_TYPE_CLASS_CHECK (NODE)->pure_virtuals)
2284
2285 /* Nonzero means that this type is an abstract class type.  */
2286 #define ABSTRACT_CLASS_TYPE_P(NODE) \
2287   (CLASS_TYPE_P (NODE) && CLASSTYPE_PURE_VIRTUALS(NODE))
2288
2289 /* Nonzero means that this type has an X() constructor.  */
2290 #define TYPE_HAS_DEFAULT_CONSTRUCTOR(NODE) \
2291   (LANG_TYPE_CLASS_CHECK (NODE)->has_default_ctor)
2292
2293 /* Nonzero means that this type contains a mutable member.  */
2294 #define CLASSTYPE_HAS_MUTABLE(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_mutable)
2295 #define TYPE_HAS_MUTABLE_P(NODE) (cp_has_mutable_p (NODE))
2296
2297 /* Nonzero means that this class type is not POD for the purpose of layout
2298    (as defined in the ABI).  This is different from the language's POD.  */
2299 #define CLASSTYPE_NON_LAYOUT_POD_P(NODE) \
2300   (LANG_TYPE_CLASS_CHECK (NODE)->non_pod_class)
2301
2302 /* Nonzero means that this class type is a non-standard-layout class.  */
2303 #define CLASSTYPE_NON_STD_LAYOUT(NODE) \
2304   (LANG_TYPE_CLASS_CHECK (NODE)->non_std_layout)
2305
2306 /* Nonzero means that this class type does have unique object
2307    representations.  */
2308 #define CLASSTYPE_UNIQUE_OBJ_REPRESENTATIONS(NODE) \
2309   (LANG_TYPE_CLASS_CHECK (NODE)->unique_obj_representations)
2310
2311 /* Nonzero means that this class type has
2312    CLASSTYPE_UNIQUE_OBJ_REPRESENTATIONS computed.  */
2313 #define CLASSTYPE_UNIQUE_OBJ_REPRESENTATIONS_SET(NODE) \
2314   (LANG_TYPE_CLASS_CHECK (NODE)->unique_obj_representations_set)
2315
2316 /* Nonzero means that this class contains pod types whose default
2317    initialization is not a zero initialization (namely, pointers to
2318    data members).  */
2319 #define CLASSTYPE_NON_ZERO_INIT_P(NODE) \
2320   (LANG_TYPE_CLASS_CHECK (NODE)->non_zero_init)
2321
2322 /* Nonzero if this class is "empty" in the sense of the C++ ABI.  */
2323 #define CLASSTYPE_EMPTY_P(NODE) \
2324   (LANG_TYPE_CLASS_CHECK (NODE)->empty_p)
2325
2326 /* Nonzero if this class is "nearly empty", i.e., contains only a
2327    virtual function table pointer.  */
2328 #define CLASSTYPE_NEARLY_EMPTY_P(NODE) \
2329   (LANG_TYPE_CLASS_CHECK (NODE)->nearly_empty_p)
2330
2331 /* Nonzero if this class contains an empty subobject.  */
2332 #define CLASSTYPE_CONTAINS_EMPTY_CLASS_P(NODE) \
2333   (LANG_TYPE_CLASS_CHECK (NODE)->contains_empty_class_p)
2334
2335 /* A list of class types of which this type is a friend.  The
2336    TREE_VALUE is normally a TYPE, but will be a TEMPLATE_DECL in the
2337    case of a template friend.  */
2338 #define CLASSTYPE_FRIEND_CLASSES(NODE) \
2339   (LANG_TYPE_CLASS_CHECK (NODE)->friend_classes)
2340
2341 /* A list of the classes which grant friendship to this class.  */
2342 #define CLASSTYPE_BEFRIENDING_CLASSES(NODE) \
2343   (LANG_TYPE_CLASS_CHECK (NODE)->befriending_classes)
2344
2345 /* The associated LAMBDA_EXPR that made this class.  */
2346 #define CLASSTYPE_LAMBDA_EXPR(NODE) \
2347   (LANG_TYPE_CLASS_CHECK (NODE)->lambda_expr)
2348 /* The extra mangling scope for this closure type.  */
2349 #define LAMBDA_TYPE_EXTRA_SCOPE(NODE) \
2350   (LAMBDA_EXPR_EXTRA_SCOPE (CLASSTYPE_LAMBDA_EXPR (NODE)))
2351
2352 /* Say whether this node was declared as a "class" or a "struct".  */
2353 #define CLASSTYPE_DECLARED_CLASS(NODE) \
2354   (LANG_TYPE_CLASS_CHECK (NODE)->declared_class)
2355
2356 /* Nonzero if this class has const members
2357    which have no specified initialization.  */
2358 #define CLASSTYPE_READONLY_FIELDS_NEED_INIT(NODE)       \
2359   (TYPE_LANG_SPECIFIC (NODE)                            \
2360    ? LANG_TYPE_CLASS_CHECK (NODE)->const_needs_init : 0)
2361 #define SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT(NODE, VALUE) \
2362   (LANG_TYPE_CLASS_CHECK (NODE)->const_needs_init = (VALUE))
2363
2364 /* Nonzero if this class has ref members
2365    which have no specified initialization.  */
2366 #define CLASSTYPE_REF_FIELDS_NEED_INIT(NODE)            \
2367   (TYPE_LANG_SPECIFIC (NODE)                            \
2368    ? LANG_TYPE_CLASS_CHECK (NODE)->ref_needs_init : 0)
2369 #define SET_CLASSTYPE_REF_FIELDS_NEED_INIT(NODE, VALUE) \
2370   (LANG_TYPE_CLASS_CHECK (NODE)->ref_needs_init = (VALUE))
2371
2372 /* Nonzero if this class is included from a header file which employs
2373    `#pragma interface', and it is not included in its implementation file.  */
2374 #define CLASSTYPE_INTERFACE_ONLY(NODE) \
2375   (LANG_TYPE_CLASS_CHECK (NODE)->interface_only)
2376
2377 /* True if we have already determined whether or not vtables, VTTs,
2378    typeinfo, and other similar per-class data should be emitted in
2379    this translation unit.  This flag does not indicate whether or not
2380    these items should be emitted; it only indicates that we know one
2381    way or the other.  */
2382 #define CLASSTYPE_INTERFACE_KNOWN(NODE) \
2383   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown == 0)
2384 /* The opposite of CLASSTYPE_INTERFACE_KNOWN.  */
2385 #define CLASSTYPE_INTERFACE_UNKNOWN(NODE) \
2386   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown)
2387
2388 #define SET_CLASSTYPE_INTERFACE_UNKNOWN_X(NODE,X) \
2389   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown = !!(X))
2390 #define SET_CLASSTYPE_INTERFACE_UNKNOWN(NODE) \
2391   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown = 1)
2392 #define SET_CLASSTYPE_INTERFACE_KNOWN(NODE) \
2393   (LANG_TYPE_CLASS_CHECK (NODE)->interface_unknown = 0)
2394
2395 /* Nonzero if a _DECL node requires us to output debug info for this class.  */
2396 #define CLASSTYPE_DEBUG_REQUESTED(NODE) \
2397   (LANG_TYPE_CLASS_CHECK (NODE)->debug_requested)
2398 \f
2399 /* Additional macros for inheritance information.  */
2400
2401 /* Nonzero means that this class is on a path leading to a new vtable.  */
2402 #define BINFO_VTABLE_PATH_MARKED(NODE) BINFO_FLAG_1 (NODE)
2403
2404 /* Nonzero means B (a BINFO) has its own vtable.  Any copies will not
2405    have this flag set.  */
2406 #define BINFO_NEW_VTABLE_MARKED(B) (BINFO_FLAG_2 (B))
2407
2408 /* Compare a BINFO_TYPE with another type for equality.  For a binfo,
2409    this is functionally equivalent to using same_type_p, but
2410    measurably faster.  At least one of the arguments must be a
2411    BINFO_TYPE.  The other can be a BINFO_TYPE or a regular type.  If
2412    BINFO_TYPE(T) ever stops being the main variant of the class the
2413    binfo is for, this macro must change.  */
2414 #define SAME_BINFO_TYPE_P(A, B) ((A) == (B))
2415
2416 /* Any subobject that needs a new vtable must have a vptr and must not
2417    be a non-virtual primary base (since it would then use the vtable from a
2418    derived class and never become non-primary.)  */
2419 #define SET_BINFO_NEW_VTABLE_MARKED(B)                                   \
2420   (BINFO_NEW_VTABLE_MARKED (B) = 1,                                      \
2421    gcc_assert (!BINFO_PRIMARY_P (B) || BINFO_VIRTUAL_P (B)),             \
2422    gcc_assert (TYPE_VFIELD (BINFO_TYPE (B))))
2423
2424 /* Nonzero if this binfo is for a dependent base - one that should not
2425    be searched.  */
2426 #define BINFO_DEPENDENT_BASE_P(NODE) BINFO_FLAG_3 (NODE)
2427
2428 /* Nonzero if this binfo has lost its primary base binfo (because that
2429    is a nearly-empty virtual base that has been taken by some other
2430    base in the complete hierarchy.  */
2431 #define BINFO_LOST_PRIMARY_P(NODE) BINFO_FLAG_4 (NODE)
2432
2433 /* Nonzero if this BINFO is a primary base class.  */
2434 #define BINFO_PRIMARY_P(NODE) BINFO_FLAG_5(NODE)
2435 \f
2436 /* A vec<tree_pair_s> of the vcall indices associated with the class
2437    NODE.  The PURPOSE of each element is a FUNCTION_DECL for a virtual
2438    function.  The VALUE is the index into the virtual table where the
2439    vcall offset for that function is stored, when NODE is a virtual
2440    base.  */
2441 #define CLASSTYPE_VCALL_INDICES(NODE) \
2442   (LANG_TYPE_CLASS_CHECK (NODE)->vcall_indices)
2443
2444 /* The various vtables for the class NODE.  The primary vtable will be
2445    first, followed by the construction vtables and VTT, if any.  */
2446 #define CLASSTYPE_VTABLES(NODE) \
2447   (LANG_TYPE_CLASS_CHECK (NODE)->vtables)
2448
2449 /* The std::type_info variable representing this class, or NULL if no
2450    such variable has been created.  This field is only set for the
2451    TYPE_MAIN_VARIANT of the class.  */
2452 #define CLASSTYPE_TYPEINFO_VAR(NODE) \
2453   (LANG_TYPE_CLASS_CHECK (NODE)->typeinfo_var)
2454
2455 /* Accessor macros for the BINFO_VIRTUALS list.  */
2456
2457 /* The number of bytes by which to adjust the `this' pointer when
2458    calling this virtual function.  Subtract this value from the this
2459    pointer. Always non-NULL, might be constant zero though.  */
2460 #define BV_DELTA(NODE) (TREE_PURPOSE (NODE))
2461
2462 /* If non-NULL, the vtable index at which to find the vcall offset
2463    when calling this virtual function.  Add the value at that vtable
2464    index to the this pointer.  */
2465 #define BV_VCALL_INDEX(NODE) (TREE_TYPE (NODE))
2466
2467 /* The function to call.  */
2468 #define BV_FN(NODE) (TREE_VALUE (NODE))
2469
2470 /* Whether or not this entry is for a lost primary virtual base.  */
2471 #define BV_LOST_PRIMARY(NODE) (TREE_LANG_FLAG_0 (NODE))
2472 \f
2473 /* For FUNCTION_TYPE or METHOD_TYPE, a list of the exceptions that
2474    this type can raise.  Each TREE_VALUE is a _TYPE.  The TREE_VALUE
2475    will be NULL_TREE to indicate a throw specification of `()', or
2476    no exceptions allowed.  For a noexcept specification, TREE_VALUE
2477    is NULL_TREE and TREE_PURPOSE is the constant-expression.  For
2478    a deferred noexcept-specification, TREE_PURPOSE is a DEFERRED_NOEXCEPT
2479    (for templates) or an OVERLOAD list of functions (for implicitly
2480    declared functions).  */
2481 #define TYPE_RAISES_EXCEPTIONS(NODE) \
2482   TYPE_LANG_SLOT_1 (FUNC_OR_METHOD_CHECK (NODE))
2483
2484 /* For FUNCTION_TYPE or METHOD_TYPE, return 1 iff it is declared `throw()'
2485    or noexcept(true).  */
2486 #define TYPE_NOTHROW_P(NODE) nothrow_spec_p (TYPE_RAISES_EXCEPTIONS (NODE))
2487
2488 /* For FUNCTION_TYPE or METHOD_TYPE, true if NODE is noexcept.  This is the
2489    case for things declared noexcept(true) and, with -fnothrow-opt, for
2490    throw() functions.  */
2491 #define TYPE_NOEXCEPT_P(NODE) type_noexcept_p (NODE)
2492
2493 /* The binding level associated with the namespace.  */
2494 #define NAMESPACE_LEVEL(NODE) \
2495   (LANG_DECL_NS_CHECK (NODE)->level)
2496 \f
2497 /* Discriminator values for lang_decl.  */
2498
2499 enum lang_decl_selector
2500 {
2501   lds_min,
2502   lds_fn,
2503   lds_ns,
2504   lds_parm,
2505   lds_decomp
2506 };
2507
2508 /* Flags shared by all forms of DECL_LANG_SPECIFIC.
2509
2510    Some of the flags live here only to make lang_decl_min/fn smaller.  Do
2511    not make this struct larger than 32 bits; instead, make sel smaller.  */
2512
2513 struct GTY(()) lang_decl_base {
2514   /* Larger than necessary for faster access.  */
2515   ENUM_BITFIELD(lang_decl_selector) selector : 16;
2516   ENUM_BITFIELD(languages) language : 1;
2517   unsigned use_template : 2;
2518   unsigned not_really_extern : 1;          /* var or fn */
2519   unsigned initialized_in_class : 1;       /* var or fn */
2520   unsigned repo_available_p : 1;           /* var or fn */
2521   unsigned threadprivate_or_deleted_p : 1; /* var or fn */
2522   unsigned anticipated_p : 1;              /* fn, type or template */
2523   /* anticipated_p reused as DECL_OMP_PRIVATIZED_MEMBER in var */
2524   unsigned friend_or_tls : 1;              /* var, fn, type or template */
2525   unsigned unknown_bound_p : 1;            /* var */
2526   unsigned odr_used : 1;                   /* var or fn */
2527   unsigned u2sel : 1;
2528   unsigned concept_p : 1;                  /* applies to vars and functions */
2529   unsigned var_declared_inline_p : 1;      /* var */
2530   unsigned dependent_init_p : 1;           /* var */
2531   /* 1 spare bit */
2532 };
2533
2534 /* True for DECL codes which have template info and access.  */
2535 #define LANG_DECL_HAS_MIN(NODE)                 \
2536   (VAR_OR_FUNCTION_DECL_P (NODE)                \
2537    || TREE_CODE (NODE) == FIELD_DECL            \
2538    || TREE_CODE (NODE) == CONST_DECL            \
2539    || TREE_CODE (NODE) == TYPE_DECL             \
2540    || TREE_CODE (NODE) == TEMPLATE_DECL         \
2541    || TREE_CODE (NODE) == USING_DECL)
2542
2543 /* DECL_LANG_SPECIFIC for the above codes.  */
2544
2545 struct GTY(()) lang_decl_min {
2546   struct lang_decl_base base;
2547
2548   /* In a FUNCTION_DECL for which DECL_THUNK_P holds, this is
2549      THUNK_ALIAS.
2550      In a FUNCTION_DECL for which DECL_THUNK_P does not hold,
2551      VAR_DECL, TYPE_DECL, or TEMPLATE_DECL, this is
2552      DECL_TEMPLATE_INFO.  */
2553   tree template_info;
2554
2555   union lang_decl_u2 {
2556     /* In a FUNCTION_DECL for which DECL_THUNK_P holds, this is
2557        THUNK_VIRTUAL_OFFSET.
2558        In a VAR_DECL for which DECL_HAS_VALUE_EXPR_P holds,
2559        this is DECL_CAPTURED_VARIABLE.
2560        Otherwise this is DECL_ACCESS.  */
2561     tree GTY ((tag ("0"))) access;
2562
2563     /* For TREE_STATIC VAR_DECL in function, this is DECL_DISCRIMINATOR.  */
2564     int GTY ((tag ("1"))) discriminator;
2565   } GTY ((desc ("%0.u.base.u2sel"))) u2;
2566 };
2567
2568 /* Additional DECL_LANG_SPECIFIC information for functions.  */
2569
2570 struct GTY(()) lang_decl_fn {
2571   struct lang_decl_min min;
2572
2573   /* In a overloaded operator, this is the compressed operator code.  */
2574   unsigned ovl_op_code : 6;
2575   unsigned global_ctor_p : 1;
2576   unsigned global_dtor_p : 1;
2577
2578   unsigned static_function : 1;
2579   unsigned pure_virtual : 1;
2580   unsigned defaulted_p : 1;
2581   unsigned has_in_charge_parm_p : 1;
2582   unsigned has_vtt_parm_p : 1;
2583   unsigned pending_inline_p : 1;
2584   unsigned nonconverting : 1;
2585   unsigned thunk_p : 1;
2586
2587   unsigned this_thunk_p : 1;
2588   unsigned hidden_friend_p : 1;
2589   unsigned omp_declare_reduction_p : 1;
2590   unsigned has_dependent_explicit_spec_p : 1;
2591   unsigned spare : 12;
2592
2593   /* 32-bits padding on 64-bit host.  */
2594
2595   /* For a non-thunk function decl, this is a tree list of
2596      friendly classes. For a thunk function decl, it is the
2597      thunked to function decl.  */
2598   tree befriending_classes;
2599
2600   /* For a non-virtual FUNCTION_DECL, this is
2601      DECL_FRIEND_CONTEXT.  For a virtual FUNCTION_DECL for which
2602      DECL_THIS_THUNK_P does not hold, this is DECL_THUNKS. Both
2603      this pointer and result pointer adjusting thunks are
2604      chained here.  This pointer thunks to return pointer thunks
2605      will be chained on the return pointer thunk.  */
2606   tree context;
2607
2608   union lang_decl_u5
2609   {
2610     /* In a non-thunk FUNCTION_DECL or TEMPLATE_DECL, this is
2611        DECL_CLONED_FUNCTION.  */
2612     tree GTY ((tag ("0"))) cloned_function;
2613
2614     /* In a FUNCTION_DECL for which THUNK_P holds this is the
2615        THUNK_FIXED_OFFSET.  */
2616     HOST_WIDE_INT GTY ((tag ("1"))) fixed_offset;
2617   } GTY ((desc ("%1.thunk_p"))) u5;
2618
2619   union lang_decl_u3
2620   {
2621     struct cp_token_cache * GTY ((tag ("1"))) pending_inline_info;
2622     struct language_function * GTY ((tag ("0")))
2623       saved_language_function;
2624   } GTY ((desc ("%1.pending_inline_p"))) u;
2625
2626 };
2627
2628 /* DECL_LANG_SPECIFIC for namespaces.  */
2629
2630 struct GTY(()) lang_decl_ns {
2631   struct lang_decl_base base;
2632   cp_binding_level *level;
2633
2634   /* using directives and inline children.  These need to be va_gc,
2635      because of PCH.  */
2636   vec<tree, va_gc> *usings;
2637   vec<tree, va_gc> *inlinees;
2638
2639   /* Hash table of bound decls. It'd be nice to have this inline, but
2640      as the hash_map has a dtor, we can't then put this struct into a
2641      union (until moving to c++11).  */
2642   hash_table<named_decl_hash> *bindings;
2643 };
2644
2645 /* DECL_LANG_SPECIFIC for parameters.  */
2646
2647 struct GTY(()) lang_decl_parm {
2648   struct lang_decl_base base;
2649   int level;
2650   int index;
2651 };
2652
2653 /* Additional DECL_LANG_SPECIFIC information for structured bindings.  */
2654
2655 struct GTY(()) lang_decl_decomp {
2656   struct lang_decl_min min;
2657   /* The artificial underlying "e" variable of the structured binding
2658      variable.  */
2659   tree base;
2660 };
2661
2662 /* DECL_LANG_SPECIFIC for all types.  It would be nice to just make this a
2663    union rather than a struct containing a union as its only field, but
2664    tree.h declares it as a struct.  */
2665
2666 struct GTY(()) lang_decl {
2667   union GTY((desc ("%h.base.selector"))) lang_decl_u {
2668      /* Nothing of only the base type exists.  */
2669     struct lang_decl_base GTY ((default)) base;
2670     struct lang_decl_min GTY((tag ("lds_min"))) min;
2671     struct lang_decl_fn GTY ((tag ("lds_fn"))) fn;
2672     struct lang_decl_ns GTY((tag ("lds_ns"))) ns;
2673     struct lang_decl_parm GTY((tag ("lds_parm"))) parm;
2674     struct lang_decl_decomp GTY((tag ("lds_decomp"))) decomp;
2675   } u;
2676 };
2677
2678 /* Looks through a template (if present) to find what it declares.  */
2679 #define STRIP_TEMPLATE(NODE) \
2680   (TREE_CODE (NODE) == TEMPLATE_DECL ? DECL_TEMPLATE_RESULT (NODE) : NODE)
2681
2682 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
2683
2684 #define LANG_DECL_MIN_CHECK(NODE) __extension__                 \
2685 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);            \
2686    if (!LANG_DECL_HAS_MIN (NODE))                               \
2687      lang_check_failed (__FILE__, __LINE__, __FUNCTION__);      \
2688    &lt->u.min; })
2689
2690 /* We want to be able to check DECL_CONSTRUCTOR_P and such on a function
2691    template, not just on a FUNCTION_DECL.  So when looking for things in
2692    lang_decl_fn, look down through a TEMPLATE_DECL into its result.  */
2693 #define LANG_DECL_FN_CHECK(NODE) __extension__                          \
2694 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (STRIP_TEMPLATE (NODE));   \
2695    if (!DECL_DECLARES_FUNCTION_P (NODE)                                 \
2696        || lt->u.base.selector != lds_fn)                                \
2697      lang_check_failed (__FILE__, __LINE__, __FUNCTION__);              \
2698    &lt->u.fn; })
2699
2700 #define LANG_DECL_NS_CHECK(NODE) __extension__                          \
2701 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);                    \
2702    if (TREE_CODE (NODE) != NAMESPACE_DECL                               \
2703        || lt->u.base.selector != lds_ns)                                \
2704      lang_check_failed (__FILE__, __LINE__, __FUNCTION__);              \
2705    &lt->u.ns; })
2706
2707 #define LANG_DECL_PARM_CHECK(NODE) __extension__                \
2708 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);            \
2709   if (TREE_CODE (NODE) != PARM_DECL                             \
2710       || lt->u.base.selector != lds_parm)                       \
2711     lang_check_failed (__FILE__, __LINE__, __FUNCTION__);       \
2712   &lt->u.parm; })
2713
2714 #define LANG_DECL_DECOMP_CHECK(NODE) __extension__              \
2715 ({ struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);            \
2716   if (!VAR_P (NODE)                                             \
2717       || lt->u.base.selector != lds_decomp)                     \
2718     lang_check_failed (__FILE__, __LINE__, __FUNCTION__);       \
2719   &lt->u.decomp; })
2720
2721 #define LANG_DECL_U2_CHECK(NODE, TF) __extension__              \
2722 ({  struct lang_decl *lt = DECL_LANG_SPECIFIC (NODE);           \
2723     if (!LANG_DECL_HAS_MIN (NODE) || lt->u.base.u2sel != TF)    \
2724       lang_check_failed (__FILE__, __LINE__, __FUNCTION__);     \
2725     &lt->u.min.u2; })
2726
2727 #else
2728
2729 #define LANG_DECL_MIN_CHECK(NODE) \
2730   (&DECL_LANG_SPECIFIC (NODE)->u.min)
2731
2732 #define LANG_DECL_FN_CHECK(NODE) \
2733   (&DECL_LANG_SPECIFIC (STRIP_TEMPLATE (NODE))->u.fn)
2734
2735 #define LANG_DECL_NS_CHECK(NODE) \
2736   (&DECL_LANG_SPECIFIC (NODE)->u.ns)
2737
2738 #define LANG_DECL_PARM_CHECK(NODE) \
2739   (&DECL_LANG_SPECIFIC (NODE)->u.parm)
2740
2741 #define LANG_DECL_DECOMP_CHECK(NODE) \
2742   (&DECL_LANG_SPECIFIC (NODE)->u.decomp)
2743
2744 #define LANG_DECL_U2_CHECK(NODE, TF) \
2745   (&DECL_LANG_SPECIFIC (NODE)->u.min.u2)
2746
2747 #endif /* ENABLE_TREE_CHECKING */
2748
2749 /* For a FUNCTION_DECL or a VAR_DECL, the language linkage for the
2750    declaration.  Some entities (like a member function in a local
2751    class, or a local variable) do not have linkage at all, and this
2752    macro should not be used in those cases.
2753
2754    Implementation note: A FUNCTION_DECL without DECL_LANG_SPECIFIC was
2755    created by language-independent code, and has C linkage.  Most
2756    VAR_DECLs have C++ linkage, and do not have DECL_LANG_SPECIFIC, but
2757    we do create DECL_LANG_SPECIFIC for variables with non-C++ linkage.  */
2758 #define DECL_LANGUAGE(NODE)                             \
2759   (DECL_LANG_SPECIFIC (NODE)                            \
2760    ? DECL_LANG_SPECIFIC (NODE)->u.base.language         \
2761    : (TREE_CODE (NODE) == FUNCTION_DECL                 \
2762       ? lang_c : lang_cplusplus))
2763
2764 /* Set the language linkage for NODE to LANGUAGE.  */
2765 #define SET_DECL_LANGUAGE(NODE, LANGUAGE) \
2766   (DECL_LANG_SPECIFIC (NODE)->u.base.language = (LANGUAGE))
2767
2768 /* For FUNCTION_DECLs and TEMPLATE_DECLs: nonzero means that this function
2769    is a constructor.  */
2770 #define DECL_CONSTRUCTOR_P(NODE) \
2771   DECL_CXX_CONSTRUCTOR_P (STRIP_TEMPLATE (NODE))
2772
2773 /* Nonzero if NODE (a FUNCTION_DECL) is a constructor for a complete
2774    object.  */
2775 #define DECL_COMPLETE_CONSTRUCTOR_P(NODE)               \
2776   (DECL_NAME (NODE) == complete_ctor_identifier)
2777
2778 /* Nonzero if NODE (a FUNCTION_DECL) is a constructor for a base
2779    object.  */
2780 #define DECL_BASE_CONSTRUCTOR_P(NODE)           \
2781   (DECL_NAME (NODE) == base_ctor_identifier)
2782
2783 /* Nonzero if NODE (a FUNCTION_DECL) is a constructor, but not either the
2784    specialized in-charge constructor or the specialized not-in-charge
2785    constructor.  */
2786 #define DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P(NODE)                \
2787   (DECL_NAME (NODE) == ctor_identifier)
2788
2789 /* Nonzero if NODE (a FUNCTION_DECL) is a copy constructor.  */
2790 #define DECL_COPY_CONSTRUCTOR_P(NODE) \
2791   (DECL_CONSTRUCTOR_P (NODE) && copy_fn_p (NODE) > 0)
2792
2793 /* Nonzero if NODE (a FUNCTION_DECL) is a move constructor.  */
2794 #define DECL_MOVE_CONSTRUCTOR_P(NODE) \
2795   (DECL_CONSTRUCTOR_P (NODE) && move_fn_p (NODE))
2796
2797 /* Nonzero if NODE (a FUNCTION_DECL or TEMPLATE_DECL)
2798    is a destructor.  */
2799 #define DECL_DESTRUCTOR_P(NODE)                         \
2800   DECL_CXX_DESTRUCTOR_P (STRIP_TEMPLATE (NODE))
2801
2802 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor, but not the
2803    specialized in-charge constructor, in-charge deleting constructor,
2804    or the base destructor.  */
2805 #define DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P(NODE)                 \
2806   (DECL_NAME (NODE) == dtor_identifier)
2807
2808 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor for a complete
2809    object.  */
2810 #define DECL_COMPLETE_DESTRUCTOR_P(NODE)                \
2811   (DECL_NAME (NODE) == complete_dtor_identifier)
2812
2813 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor for a base
2814    object.  */
2815 #define DECL_BASE_DESTRUCTOR_P(NODE)            \
2816   (DECL_NAME (NODE) == base_dtor_identifier)
2817
2818 /* Nonzero if NODE (a FUNCTION_DECL) is a destructor for a complete
2819    object that deletes the object after it has been destroyed.  */
2820 #define DECL_DELETING_DESTRUCTOR_P(NODE)                \
2821   (DECL_NAME (NODE) == deleting_dtor_identifier)
2822
2823 /* Nonzero if either DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P or
2824    DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P is true of NODE.  */
2825 #define DECL_MAYBE_IN_CHARGE_CDTOR_P(NODE)              \
2826   (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (NODE)            \
2827    || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (NODE))
2828
2829 /* Nonzero if NODE (a FUNCTION_DECL) is a cloned constructor or
2830    destructor.  */
2831 #define DECL_CLONED_FUNCTION_P(NODE) (!!decl_cloned_function_p (NODE, true))
2832
2833 /* If DECL_CLONED_FUNCTION_P holds, this is the function that was
2834    cloned.  */
2835 #define DECL_CLONED_FUNCTION(NODE) (*decl_cloned_function_p (NODE, false))
2836
2837 /* Perform an action for each clone of FN, if FN is a function with
2838    clones.  This macro should be used like:
2839
2840       FOR_EACH_CLONE (clone, fn)
2841         { ... }
2842
2843   */
2844 #define FOR_EACH_CLONE(CLONE, FN)                       \
2845   if (!(TREE_CODE (FN) == FUNCTION_DECL                 \
2846         && DECL_MAYBE_IN_CHARGE_CDTOR_P (FN)))          \
2847     ;                                                   \
2848   else                                                  \
2849     for (CLONE = DECL_CHAIN (FN);                       \
2850          CLONE && DECL_CLONED_FUNCTION_P (CLONE);       \
2851          CLONE = DECL_CHAIN (CLONE))
2852
2853 /* Nonzero if NODE has DECL_DISCRIMINATOR and not DECL_ACCESS.  */
2854 #define DECL_DISCRIMINATOR_P(NODE)      \
2855   (VAR_P (NODE) && DECL_FUNCTION_SCOPE_P (NODE))
2856
2857 /* Discriminator for name mangling.  */
2858 #define DECL_DISCRIMINATOR(NODE) (LANG_DECL_U2_CHECK (NODE, 1)->discriminator)
2859
2860 /* True iff DECL_DISCRIMINATOR is set for a DECL_DISCRIMINATOR_P decl.  */
2861 #define DECL_DISCRIMINATOR_SET_P(NODE) \
2862   (DECL_LANG_SPECIFIC (NODE) && DECL_LANG_SPECIFIC (NODE)->u.base.u2sel == 1)
2863
2864 /* The index of a user-declared parameter in its function, starting at 1.
2865    All artificial parameters will have index 0.  */
2866 #define DECL_PARM_INDEX(NODE) \
2867   (LANG_DECL_PARM_CHECK (NODE)->index)
2868
2869 /* The level of a user-declared parameter in its function, starting at 1.
2870    A parameter of the function will have level 1; a parameter of the first
2871    nested function declarator (i.e. t in void f (void (*p)(T t))) will have
2872    level 2.  */
2873 #define DECL_PARM_LEVEL(NODE) \
2874   (LANG_DECL_PARM_CHECK (NODE)->level)
2875
2876 /* Nonzero if the VTT parm has been added to NODE.  */
2877 #define DECL_HAS_VTT_PARM_P(NODE) \
2878   (LANG_DECL_FN_CHECK (NODE)->has_vtt_parm_p)
2879
2880 /* Nonzero if NODE is a FUNCTION_DECL for which a VTT parameter is
2881    required.  */
2882 #define DECL_NEEDS_VTT_PARM_P(NODE)                     \
2883   (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (NODE))         \
2884    && (DECL_BASE_CONSTRUCTOR_P (NODE)                   \
2885        || DECL_BASE_DESTRUCTOR_P (NODE)))
2886
2887 /* Nonzero if NODE is a user-defined conversion operator.  */
2888 #define DECL_CONV_FN_P(NODE) IDENTIFIER_CONV_OP_P (DECL_NAME (NODE))
2889
2890 /* The type to which conversion operator FN converts to.   */
2891 #define DECL_CONV_FN_TYPE(FN) \
2892   TREE_TYPE ((gcc_checking_assert (DECL_CONV_FN_P (FN)), DECL_NAME (FN)))
2893
2894 /* Nonzero if NODE, a static data member, was declared in its class as an
2895    array of unknown bound.  */
2896 #define VAR_HAD_UNKNOWN_BOUND(NODE)                     \
2897   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))           \
2898    ? DECL_LANG_SPECIFIC (NODE)->u.base.unknown_bound_p  \
2899    : false)
2900 #define SET_VAR_HAD_UNKNOWN_BOUND(NODE) \
2901   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.unknown_bound_p = true)
2902
2903 /* True iff decl NODE is for an overloaded operator.  */
2904 #define DECL_OVERLOADED_OPERATOR_P(NODE)                \
2905   IDENTIFIER_ANY_OP_P (DECL_NAME (NODE))
2906
2907 /* Nonzero if NODE is an assignment operator (including += and such).  */
2908 #define DECL_ASSIGNMENT_OPERATOR_P(NODE)                 \
2909   IDENTIFIER_ASSIGN_OP_P (DECL_NAME (NODE))
2910
2911 /* NODE is a function_decl for an overloaded operator.  Return its
2912    compressed (raw) operator code.  Note that this is not a TREE_CODE.  */
2913 #define DECL_OVERLOADED_OPERATOR_CODE_RAW(NODE)         \
2914   (LANG_DECL_FN_CHECK (NODE)->ovl_op_code)
2915
2916 /* DECL is an overloaded operator.  Test whether it is for TREE_CODE
2917    (a literal constant).  */
2918 #define DECL_OVERLOADED_OPERATOR_IS(DECL, CODE)                 \
2919   (DECL_OVERLOADED_OPERATOR_CODE_RAW (DECL) == OVL_OP_##CODE)
2920
2921 /* For FUNCTION_DECLs: nonzero means that this function is a
2922    constructor or a destructor with an extra in-charge parameter to
2923    control whether or not virtual bases are constructed.  */
2924 #define DECL_HAS_IN_CHARGE_PARM_P(NODE) \
2925   (LANG_DECL_FN_CHECK (NODE)->has_in_charge_parm_p)
2926
2927 /* Nonzero if DECL is a declaration of __builtin_constant_p.  */
2928 #define DECL_IS_BUILTIN_CONSTANT_P(NODE)                \
2929  (TREE_CODE (NODE) == FUNCTION_DECL                     \
2930   && DECL_BUILT_IN_CLASS (NODE) == BUILT_IN_NORMAL      \
2931   && DECL_FUNCTION_CODE (NODE) == BUILT_IN_CONSTANT_P)
2932
2933 /* Nonzero for _DECL means that this decl appears in (or will appear
2934    in) as a member in a RECORD_TYPE or UNION_TYPE node.  It is also for
2935    detecting circularity in case members are multiply defined.  In the
2936    case of a VAR_DECL, it is also used to determine how program storage
2937    should be allocated.  */
2938 #define DECL_IN_AGGR_P(NODE) (DECL_LANG_FLAG_3 (NODE))
2939
2940 /* Nonzero for a VAR_DECL means that the variable's initialization (if
2941    any) has been processed.  (In general, DECL_INITIALIZED_P is
2942    !DECL_EXTERNAL, but static data members may be initialized even if
2943    not defined.)  */
2944 #define DECL_INITIALIZED_P(NODE) \
2945    (TREE_LANG_FLAG_1 (VAR_DECL_CHECK (NODE)))
2946
2947 /* Nonzero for a VAR_DECL iff an explicit initializer was provided
2948    or a non-trivial constructor is called.  */
2949 #define DECL_NONTRIVIALLY_INITIALIZED_P(NODE)   \
2950    (TREE_LANG_FLAG_3 (VAR_DECL_CHECK (NODE)))
2951
2952 /* Nonzero for a VAR_DECL that was initialized with a
2953    constant-expression.  */
2954 #define DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P(NODE) \
2955   (TREE_LANG_FLAG_2 (VAR_DECL_CHECK (NODE)))
2956
2957 /* Nonzero if the DECL was initialized in the class definition itself,
2958    rather than outside the class.  This is used for both static member
2959    VAR_DECLS, and FUNCTION_DECLS that are defined in the class.  */
2960 #define DECL_INITIALIZED_IN_CLASS_P(DECL) \
2961   (DECL_LANG_SPECIFIC (VAR_OR_FUNCTION_DECL_CHECK (DECL)) \
2962    ->u.base.initialized_in_class)
2963
2964 /* Nonzero if the DECL is used in the sense of 3.2 [basic.def.odr].
2965    Only available for decls with DECL_LANG_SPECIFIC.  */
2966 #define DECL_ODR_USED(DECL) \
2967   (DECL_LANG_SPECIFIC (VAR_OR_FUNCTION_DECL_CHECK (DECL)) \
2968    ->u.base.odr_used)
2969
2970 /* Nonzero for DECL means that this decl is just a friend declaration,
2971    and should not be added to the list of members for this class.  */
2972 #define DECL_FRIEND_P(NODE) \
2973   (DECL_LANG_SPECIFIC (TYPE_FUNCTION_OR_TEMPLATE_DECL_CHECK (NODE)) \
2974    ->u.base.friend_or_tls)
2975
2976 /* Nonzero if the thread-local variable was declared with __thread as
2977    opposed to thread_local.  */
2978 #define DECL_GNU_TLS_P(NODE)                            \
2979   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))           \
2980    && DECL_LANG_SPECIFIC (NODE)->u.base.friend_or_tls)
2981 #define SET_DECL_GNU_TLS_P(NODE)                                \
2982   (retrofit_lang_decl (VAR_DECL_CHECK (NODE)),                  \
2983    DECL_LANG_SPECIFIC (NODE)->u.base.friend_or_tls = true)
2984
2985 /* A TREE_LIST of the types which have befriended this FUNCTION_DECL.  */
2986 #define DECL_BEFRIENDING_CLASSES(NODE) \
2987   (LANG_DECL_FN_CHECK (NODE)->befriending_classes)
2988
2989 /* Nonzero for FUNCTION_DECL means that this decl is a static
2990    member function.  */
2991 #define DECL_STATIC_FUNCTION_P(NODE) \
2992   (LANG_DECL_FN_CHECK (NODE)->static_function)
2993
2994 /* Nonzero for FUNCTION_DECL means that this decl is a non-static
2995    member function.  */
2996 #define DECL_NONSTATIC_MEMBER_FUNCTION_P(NODE) \
2997   (TREE_CODE (TREE_TYPE (NODE)) == METHOD_TYPE)
2998
2999 /* Nonzero for FUNCTION_DECL means that this decl is a member function
3000    (static or non-static).  */
3001 #define DECL_FUNCTION_MEMBER_P(NODE) \
3002   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE) || DECL_STATIC_FUNCTION_P (NODE))
3003
3004 /* Nonzero for FUNCTION_DECL means that this member function
3005    has `this' as const X *const.  */
3006 #define DECL_CONST_MEMFUNC_P(NODE)                                       \
3007   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE)                               \
3008    && CP_TYPE_CONST_P (TREE_TYPE (TREE_VALUE                             \
3009                                   (TYPE_ARG_TYPES (TREE_TYPE (NODE))))))
3010
3011 /* Nonzero for FUNCTION_DECL means that this member function
3012    has `this' as volatile X *const.  */
3013 #define DECL_VOLATILE_MEMFUNC_P(NODE)                                    \
3014   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE)                               \
3015    && CP_TYPE_VOLATILE_P (TREE_TYPE (TREE_VALUE                          \
3016                                   (TYPE_ARG_TYPES (TREE_TYPE (NODE))))))
3017
3018 /* Nonzero for a DECL means that this member is a non-static member.  */
3019 #define DECL_NONSTATIC_MEMBER_P(NODE)           \
3020   (DECL_NONSTATIC_MEMBER_FUNCTION_P (NODE)      \
3021    || TREE_CODE (NODE) == FIELD_DECL)
3022
3023 /* Nonzero for _DECL means that this member object type
3024    is mutable.  */
3025 #define DECL_MUTABLE_P(NODE) (DECL_LANG_FLAG_0 (NODE))
3026
3027 /* Nonzero for _DECL means that this constructor or conversion function is
3028    non-converting.  */
3029 #define DECL_NONCONVERTING_P(NODE) \
3030   (LANG_DECL_FN_CHECK (NODE)->nonconverting)
3031
3032 /* Nonzero for FUNCTION_DECL means that this member function is a pure
3033    virtual function.  */
3034 #define DECL_PURE_VIRTUAL_P(NODE) \
3035   (LANG_DECL_FN_CHECK (NODE)->pure_virtual)
3036
3037 /* Nonzero for FUNCTION_DECL means that this member function (either
3038    a constructor or a conversion function) has an explicit specifier
3039    with a value-dependent expression.  */
3040 #define DECL_HAS_DEPENDENT_EXPLICIT_SPEC_P(NODE) \
3041   (LANG_DECL_FN_CHECK (NODE)->has_dependent_explicit_spec_p)
3042
3043 /* True (in a FUNCTION_DECL) if NODE is a virtual function that is an
3044    invalid overrider for a function from a base class.  Once we have
3045    complained about an invalid overrider we avoid complaining about it
3046    again.  */
3047 #define DECL_INVALID_OVERRIDER_P(NODE) \
3048   (DECL_LANG_FLAG_4 (NODE))
3049
3050 /* True (in a FUNCTION_DECL) if NODE is a function declared with
3051    an override virt-specifier */
3052 #define DECL_OVERRIDE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
3053
3054 /* The thunks associated with NODE, a FUNCTION_DECL.  */
3055 #define DECL_THUNKS(NODE) \
3056   (DECL_VIRTUAL_P (NODE) ? LANG_DECL_FN_CHECK (NODE)->context : NULL_TREE)
3057
3058 /* Set DECL_THUNKS.  */
3059 #define SET_DECL_THUNKS(NODE,THUNKS) \
3060   (LANG_DECL_FN_CHECK (NODE)->context = (THUNKS))
3061
3062 /* If NODE, a FUNCTION_DECL, is a C++11 inheriting constructor, then this
3063    is the constructor it inherits from.  */
3064 #define DECL_INHERITED_CTOR(NODE) \
3065   (DECL_DECLARES_FUNCTION_P (NODE) && DECL_CONSTRUCTOR_P (NODE) \
3066    ? LANG_DECL_FN_CHECK (NODE)->context : NULL_TREE)
3067
3068 /* And this is the base that constructor comes from.  */
3069 #define DECL_INHERITED_CTOR_BASE(NODE)                  \
3070   (DECL_INHERITED_CTOR (NODE)                           \
3071    ? DECL_CONTEXT (flag_new_inheriting_ctors            \
3072                    ? strip_inheriting_ctors (NODE)      \
3073                    : DECL_INHERITED_CTOR (NODE))        \
3074    : NULL_TREE)
3075
3076 /* Set the inherited base.  */
3077 #define SET_DECL_INHERITED_CTOR(NODE,INH) \
3078   (LANG_DECL_FN_CHECK (NODE)->context = (INH))
3079
3080 /* Nonzero if NODE is a thunk, rather than an ordinary function.  */
3081 #define DECL_THUNK_P(NODE)                      \
3082   (TREE_CODE (NODE) == FUNCTION_DECL            \
3083    && DECL_LANG_SPECIFIC (NODE)                 \
3084    && LANG_DECL_FN_CHECK (NODE)->thunk_p)
3085
3086 /* Set DECL_THUNK_P for node.  */
3087 #define SET_DECL_THUNK_P(NODE, THIS_ADJUSTING)                  \
3088   (LANG_DECL_FN_CHECK (NODE)->thunk_p = 1,                      \
3089    LANG_DECL_FN_CHECK (NODE)->this_thunk_p = (THIS_ADJUSTING))
3090
3091 /* Nonzero if NODE is a this pointer adjusting thunk.  */
3092 #define DECL_THIS_THUNK_P(NODE)                 \
3093   (DECL_THUNK_P (NODE) && LANG_DECL_FN_CHECK (NODE)->this_thunk_p)
3094
3095 /* Nonzero if NODE is a result pointer adjusting thunk.  */
3096 #define DECL_RESULT_THUNK_P(NODE)                       \
3097   (DECL_THUNK_P (NODE) && !LANG_DECL_FN_CHECK (NODE)->this_thunk_p)
3098
3099 /* Nonzero if NODE is a FUNCTION_DECL, but not a thunk.  */
3100 #define DECL_NON_THUNK_FUNCTION_P(NODE)                         \
3101   (TREE_CODE (NODE) == FUNCTION_DECL && !DECL_THUNK_P (NODE))
3102
3103 /* Nonzero if NODE is `extern "C"'.  */
3104 #define DECL_EXTERN_C_P(NODE) \
3105   (DECL_LANGUAGE (NODE) == lang_c)
3106
3107 /* Nonzero if NODE is an `extern "C"' function.  */
3108 #define DECL_EXTERN_C_FUNCTION_P(NODE) \
3109   (DECL_NON_THUNK_FUNCTION_P (NODE) && DECL_EXTERN_C_P (NODE))
3110
3111 /* True iff DECL is an entity with vague linkage whose definition is
3112    available in this translation unit.  */
3113 #define DECL_REPO_AVAILABLE_P(NODE) \
3114   (DECL_LANG_SPECIFIC (NODE)->u.base.repo_available_p)
3115
3116 /* True if DECL is declared 'constexpr'.  */
3117 #define DECL_DECLARED_CONSTEXPR_P(DECL) \
3118   DECL_LANG_FLAG_8 (VAR_OR_FUNCTION_DECL_CHECK (STRIP_TEMPLATE (DECL)))
3119
3120 // True if NODE was declared as 'concept'.  The flag implies that the
3121 // declaration is constexpr, that the declaration cannot be specialized or
3122 // refined, and that the result type must be convertible to bool.
3123 #define DECL_DECLARED_CONCEPT_P(NODE) \
3124   (DECL_LANG_SPECIFIC (NODE)->u.base.concept_p)
3125
3126 /* Nonzero if this DECL is the __PRETTY_FUNCTION__ variable in a
3127    template function.  */
3128 #define DECL_PRETTY_FUNCTION_P(NODE) \
3129   (DECL_NAME (NODE) \
3130    && id_equal (DECL_NAME (NODE), "__PRETTY_FUNCTION__"))
3131
3132 /* Nonzero if the variable was declared to be thread-local.
3133    We need a special C++ version of this test because the middle-end
3134    DECL_THREAD_LOCAL_P uses the symtab, so we can't use it for
3135    templates.  */
3136 #define CP_DECL_THREAD_LOCAL_P(NODE) \
3137   (TREE_LANG_FLAG_0 (VAR_DECL_CHECK (NODE)))
3138
3139 /* The _TYPE context in which this _DECL appears.  This field holds the
3140    class where a virtual function instance is actually defined.  */
3141 #define DECL_CLASS_CONTEXT(NODE) \
3142   (DECL_CLASS_SCOPE_P (NODE) ? DECL_CONTEXT (NODE) : NULL_TREE)
3143
3144 /* For a non-member friend function, the class (if any) in which this
3145    friend was defined.  For example, given:
3146
3147      struct S { friend void f () { ... } };
3148
3149    the DECL_FRIEND_CONTEXT for `f' will be `S'.  */
3150 #define DECL_FRIEND_CONTEXT(NODE)                               \
3151   ((DECL_DECLARES_FUNCTION_P (NODE)                             \
3152     && DECL_FRIEND_P (NODE) && !DECL_FUNCTION_MEMBER_P (NODE))  \
3153    ? LANG_DECL_FN_CHECK (NODE)->context                         \
3154    : NULL_TREE)
3155
3156 /* Set the DECL_FRIEND_CONTEXT for NODE to CONTEXT.  */
3157 #define SET_DECL_FRIEND_CONTEXT(NODE, CONTEXT) \
3158   (LANG_DECL_FN_CHECK (NODE)->context = (CONTEXT))
3159
3160 #define CP_DECL_CONTEXT(NODE) \
3161   (!DECL_FILE_SCOPE_P (NODE) ? DECL_CONTEXT (NODE) : global_namespace)
3162 #define CP_TYPE_CONTEXT(NODE) \
3163   (!TYPE_FILE_SCOPE_P (NODE) ? TYPE_CONTEXT (NODE) : global_namespace)
3164 #define FROB_CONTEXT(NODE) \
3165   ((NODE) == global_namespace ? DECL_CONTEXT (NODE) : (NODE))
3166
3167 /* 1 iff NODE has namespace scope, including the global namespace.  */
3168 #define DECL_NAMESPACE_SCOPE_P(NODE)                            \
3169   (!DECL_TEMPLATE_PARM_P (NODE)                                 \
3170    && TREE_CODE (CP_DECL_CONTEXT (NODE)) == NAMESPACE_DECL)
3171
3172 #define TYPE_NAMESPACE_SCOPE_P(NODE) \
3173   (TREE_CODE (CP_TYPE_CONTEXT (NODE)) == NAMESPACE_DECL)
3174
3175 #define NAMESPACE_SCOPE_P(NODE) \
3176   ((DECL_P (NODE) && DECL_NAMESPACE_SCOPE_P (NODE)) \
3177    || (TYPE_P (NODE) && TYPE_NAMESPACE_SCOPE_P (NODE)))
3178
3179 /* 1 iff NODE is a class member.  */
3180 #define DECL_CLASS_SCOPE_P(NODE) \
3181   (DECL_CONTEXT (NODE) && TYPE_P (DECL_CONTEXT (NODE)))
3182
3183 #define TYPE_CLASS_SCOPE_P(NODE) \
3184   (TYPE_CONTEXT (NODE) && TYPE_P (TYPE_CONTEXT (NODE)))
3185
3186 /* 1 iff NODE is function-local.  */
3187 #define DECL_FUNCTION_SCOPE_P(NODE) \
3188   (DECL_CONTEXT (NODE) \
3189    && TREE_CODE (DECL_CONTEXT (NODE)) == FUNCTION_DECL)
3190
3191 #define TYPE_FUNCTION_SCOPE_P(NODE) \
3192   (TYPE_CONTEXT (NODE) && TREE_CODE (TYPE_CONTEXT (NODE)) == FUNCTION_DECL)
3193
3194 /* 1 iff VAR_DECL node NODE is a type-info decl.  This flag is set for
3195    both the primary typeinfo object and the associated NTBS name.  */
3196 #define DECL_TINFO_P(NODE) TREE_LANG_FLAG_4 (VAR_DECL_CHECK (NODE))
3197
3198 /* 1 iff VAR_DECL node NODE is virtual table or VTT.  */
3199 #define DECL_VTABLE_OR_VTT_P(NODE) TREE_LANG_FLAG_5 (VAR_DECL_CHECK (NODE))
3200
3201 /* 1 iff FUNCTION_TYPE or METHOD_TYPE has a ref-qualifier (either & or &&). */
3202 #define FUNCTION_REF_QUALIFIED(NODE) \
3203   TREE_LANG_FLAG_4 (FUNC_OR_METHOD_CHECK (NODE))
3204
3205 /* 1 iff FUNCTION_TYPE or METHOD_TYPE has &&-ref-qualifier.  */
3206 #define FUNCTION_RVALUE_QUALIFIED(NODE) \
3207   TREE_LANG_FLAG_5 (FUNC_OR_METHOD_CHECK (NODE))
3208
3209 /* Returns 1 iff VAR_DECL is a construction virtual table.
3210    DECL_VTABLE_OR_VTT_P will be true in this case and must be checked
3211    before using this macro.  */
3212 #define DECL_CONSTRUCTION_VTABLE_P(NODE) \
3213   TREE_LANG_FLAG_6 (VAR_DECL_CHECK (NODE))
3214
3215 /* 1 iff NODE is function-local, but for types.  */
3216 #define LOCAL_CLASS_P(NODE)                             \
3217   (decl_function_context (TYPE_MAIN_DECL (NODE)) != NULL_TREE)
3218
3219 /* The nesting depth of namespace, class or function.  Makes is_ancestor much
3220    simpler.  Only 8 bits available.  */
3221 #define SCOPE_DEPTH(NODE) \
3222   (NAMESPACE_DECL_CHECK (NODE)->base.u.bits.address_space)
3223
3224 /* Whether the namepace is an inline namespace.  */
3225 #define DECL_NAMESPACE_INLINE_P(NODE) \
3226   TREE_LANG_FLAG_0 (NAMESPACE_DECL_CHECK (NODE))
3227
3228 /* In a NAMESPACE_DECL, a vector of using directives.  */
3229 #define DECL_NAMESPACE_USING(NODE) \
3230    (LANG_DECL_NS_CHECK (NODE)->usings)
3231
3232 /* In a NAMESPACE_DECL, a vector of inline namespaces.  */
3233 #define DECL_NAMESPACE_INLINEES(NODE) \
3234    (LANG_DECL_NS_CHECK (NODE)->inlinees)
3235
3236 /* Pointer to hash_map from IDENTIFIERS to DECLS  */
3237 #define DECL_NAMESPACE_BINDINGS(NODE) \
3238    (LANG_DECL_NS_CHECK (NODE)->bindings)
3239
3240 /* In a NAMESPACE_DECL, points to the original namespace if this is
3241    a namespace alias.  */
3242 #define DECL_NAMESPACE_ALIAS(NODE) \
3243         DECL_ABSTRACT_ORIGIN (NAMESPACE_DECL_CHECK (NODE))
3244 #define ORIGINAL_NAMESPACE(NODE)  \
3245   (DECL_NAMESPACE_ALIAS (NODE) ? DECL_NAMESPACE_ALIAS (NODE) : (NODE))
3246
3247 /* Nonzero if NODE is the std namespace.  */
3248 #define DECL_NAMESPACE_STD_P(NODE)                      \
3249   (TREE_CODE (NODE) == NAMESPACE_DECL                   \
3250    && CP_DECL_CONTEXT (NODE) == global_namespace        \
3251    && DECL_NAME (NODE) == std_identifier)
3252
3253 /* In a TREE_LIST in an attribute list, indicates that the attribute
3254    must be applied at instantiation time.  */
3255 #define ATTR_IS_DEPENDENT(NODE) TREE_LANG_FLAG_0 (TREE_LIST_CHECK (NODE))
3256
3257 /* In a TREE_LIST in the argument of attribute abi_tag, indicates that the tag
3258    was inherited from a template parameter, not explicitly indicated.  */
3259 #define ABI_TAG_IMPLICIT(NODE) TREE_LANG_FLAG_0 (TREE_LIST_CHECK (NODE))
3260
3261 /* Non zero if this is a using decl for a dependent scope. */
3262 #define DECL_DEPENDENT_P(NODE) DECL_LANG_FLAG_0 (USING_DECL_CHECK (NODE))
3263
3264 /* The scope named in a using decl.  */
3265 #define USING_DECL_SCOPE(NODE) TREE_TYPE (USING_DECL_CHECK (NODE))
3266
3267 /* The decls named by a using decl.  */
3268 #define USING_DECL_DECLS(NODE) DECL_INITIAL (USING_DECL_CHECK (NODE))
3269
3270 /* Non zero if the using decl refers to a dependent type.  */
3271 #define USING_DECL_TYPENAME_P(NODE) DECL_LANG_FLAG_1 (USING_DECL_CHECK (NODE))
3272
3273 /* In a FUNCTION_DECL, this is nonzero if this function was defined in
3274    the class definition.  We have saved away the text of the function,
3275    but have not yet processed it.  */
3276 #define DECL_PENDING_INLINE_P(NODE) \
3277   (LANG_DECL_FN_CHECK (NODE)->pending_inline_p)
3278
3279 /* If DECL_PENDING_INLINE_P holds, this is the saved text of the
3280    function.  */
3281 #define DECL_PENDING_INLINE_INFO(NODE) \
3282   (LANG_DECL_FN_CHECK (NODE)->u.pending_inline_info)
3283
3284 /* Nonzero for TYPE_DECL means that it was written 'using name = type'.  */
3285 #define TYPE_DECL_ALIAS_P(NODE) \
3286   DECL_LANG_FLAG_6 (TYPE_DECL_CHECK (NODE))
3287
3288 /* Nonzero for TEMPLATE_DECL means that it is a 'complex' alias template.  */
3289 #define TEMPLATE_DECL_COMPLEX_ALIAS_P(NODE) \
3290   DECL_LANG_FLAG_2 (TEMPLATE_DECL_CHECK (NODE))
3291
3292 /* Nonzero for a type which is an alias for another type; i.e, a type
3293    which declaration was written 'using name-of-type =
3294    another-type'.  */
3295 #define TYPE_ALIAS_P(NODE)                      \
3296   (TYPE_P (NODE)                                \
3297    && TYPE_NAME (NODE)                          \
3298    && TREE_CODE (TYPE_NAME (NODE)) == TYPE_DECL \
3299    && TYPE_DECL_ALIAS_P (TYPE_NAME (NODE)))
3300
3301 /* If non-NULL for a VAR_DECL, FUNCTION_DECL, TYPE_DECL or
3302    TEMPLATE_DECL, the entity is either a template specialization (if
3303    DECL_USE_TEMPLATE is nonzero) or the abstract instance of the
3304    template itself.
3305
3306    In either case, DECL_TEMPLATE_INFO is a TEMPLATE_INFO, whose
3307    TI_TEMPLATE is the TEMPLATE_DECL of which this entity is a
3308    specialization or abstract instance.  The TI_ARGS is the
3309    template arguments used to specialize the template.
3310
3311    Consider:
3312
3313       template <typename T> struct S { friend void f(T) {} };
3314
3315    In this case, S<int>::f is, from the point of view of the compiler,
3316    an instantiation of a template -- but, from the point of view of
3317    the language, each instantiation of S results in a wholly unrelated
3318    global function f.  In this case, DECL_TEMPLATE_INFO for S<int>::f
3319    will be non-NULL, but DECL_USE_TEMPLATE will be zero.  */
3320 #define DECL_TEMPLATE_INFO(NODE) \
3321   (DECL_LANG_SPECIFIC (VAR_TEMPL_TYPE_FIELD_OR_FUNCTION_DECL_CHECK (NODE)) \
3322    ->u.min.template_info)
3323
3324 /* For a lambda capture proxy, its captured variable.  */
3325 #define DECL_CAPTURED_VARIABLE(NODE) \
3326   (LANG_DECL_U2_CHECK (NODE, 0)->access)
3327
3328 /* For a VAR_DECL, indicates that the variable is actually a
3329    non-static data member of anonymous union that has been promoted to
3330    variable status.  */
3331 #define DECL_ANON_UNION_VAR_P(NODE) \
3332   (DECL_LANG_FLAG_4 (VAR_DECL_CHECK (NODE)))
3333
3334 /* Template information for a RECORD_TYPE or UNION_TYPE.  */
3335 #define CLASSTYPE_TEMPLATE_INFO(NODE) \
3336   (TYPE_LANG_SLOT_1 (RECORD_OR_UNION_CHECK (NODE)))
3337
3338 /* Template information for a template template parameter.  */
3339 #define TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO(NODE) \
3340   (TYPE_LANG_SLOT_1 (BOUND_TEMPLATE_TEMPLATE_PARM_TYPE_CHECK (NODE)))
3341
3342 /* Template information for an ENUMERAL_, RECORD_, UNION_TYPE, or
3343    BOUND_TEMPLATE_TEMPLATE_PARM type.  This ignores any alias
3344    templateness of NODE.  It'd be nice if this could unconditionally
3345    access the slot, rather than return NULL if given a
3346    non-templatable type.  */
3347 #define TYPE_TEMPLATE_INFO(NODE)                                        \
3348   (TREE_CODE (NODE) == ENUMERAL_TYPE                                    \
3349    || TREE_CODE (NODE) == BOUND_TEMPLATE_TEMPLATE_PARM                  \
3350    || RECORD_OR_UNION_TYPE_P (NODE)                                     \
3351    ? TYPE_LANG_SLOT_1 (NODE) : NULL_TREE)
3352
3353 /* Template information (if any) for an alias type.  */
3354 #define TYPE_ALIAS_TEMPLATE_INFO(NODE)                                  \
3355   (DECL_LANG_SPECIFIC (TYPE_NAME (NODE))                                \
3356    ? DECL_TEMPLATE_INFO (TYPE_NAME (NODE))                              \
3357    : NULL_TREE)
3358
3359 /* If NODE is a type alias, this accessor returns the template info
3360    for the alias template (if any).  Otherwise behave as
3361    TYPE_TEMPLATE_INFO.  */
3362 #define TYPE_TEMPLATE_INFO_MAYBE_ALIAS(NODE)                            \
3363   (TYPE_ALIAS_P (NODE)                                                  \
3364    ? TYPE_ALIAS_TEMPLATE_INFO (NODE)                                    \
3365    : TYPE_TEMPLATE_INFO (NODE))
3366
3367 /* Set the template information for an ENUMERAL_, RECORD_, or
3368    UNION_TYPE to VAL.  */
3369 #define SET_TYPE_TEMPLATE_INFO(NODE, VAL)                               \
3370   (TREE_CODE (NODE) == ENUMERAL_TYPE                                    \
3371    || (CLASS_TYPE_P (NODE) && !TYPE_ALIAS_P (NODE))                     \
3372    ? (TYPE_LANG_SLOT_1 (NODE) = (VAL))                          \
3373    : (DECL_TEMPLATE_INFO (TYPE_NAME (NODE)) = (VAL)))
3374
3375 #define TI_TEMPLATE(NODE) TREE_TYPE (TEMPLATE_INFO_CHECK (NODE))
3376 #define TI_ARGS(NODE) TREE_CHAIN (TEMPLATE_INFO_CHECK (NODE))
3377 #define TI_PENDING_TEMPLATE_FLAG(NODE) \
3378   TREE_LANG_FLAG_1 (TEMPLATE_INFO_CHECK (NODE))
3379 /* For a given TREE_VEC containing a template argument list,
3380    this property contains the number of arguments that are not
3381    defaulted.  */
3382 #define NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) \
3383   TREE_CHAIN (TREE_VEC_CHECK (NODE))
3384
3385 /* Below are the setter and getter of the NON_DEFAULT_TEMPLATE_ARGS_COUNT
3386    property.  */
3387 #define SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE, INT_VALUE) \
3388   NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) = build_int_cst (NULL_TREE, INT_VALUE)
3389 #if CHECKING_P
3390 #define GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) \
3391     int_cst_value (NON_DEFAULT_TEMPLATE_ARGS_COUNT (NODE))
3392 #else
3393 #define GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT(NODE) \
3394   NON_DEFAULT_TEMPLATE_ARGS_COUNT (NODE) \
3395   ? int_cst_value (NON_DEFAULT_TEMPLATE_ARGS_COUNT (NODE)) \
3396   : TREE_VEC_LENGTH (INNERMOST_TEMPLATE_ARGS (NODE))
3397 #endif
3398 /* The list of typedefs - used in the template - that need
3399    access checking at template instantiation time.
3400
3401    FIXME this should be associated with the TEMPLATE_DECL, not the
3402    TEMPLATE_INFO.  */
3403 #define TI_TYPEDEFS_NEEDING_ACCESS_CHECKING(NODE) \
3404   ((struct tree_template_info*)TEMPLATE_INFO_CHECK \
3405      (NODE))->typedefs_needing_access_checking
3406
3407 /* We use TREE_VECs to hold template arguments.  If there is only one
3408    level of template arguments, then the TREE_VEC contains the
3409    arguments directly.  If there is more than one level of template
3410    arguments, then each entry in the TREE_VEC is itself a TREE_VEC,
3411    containing the template arguments for a single level.  The first
3412    entry in the outer TREE_VEC is the outermost level of template
3413    parameters; the last is the innermost.
3414
3415    It is incorrect to ever form a template argument vector containing
3416    only one level of arguments, but which is a TREE_VEC containing as
3417    its only entry the TREE_VEC for that level.
3418
3419    For each TREE_VEC containing the template arguments for a single
3420    level, it's possible to get or set the number of non defaulted
3421    template arguments by using the accessor macros
3422    GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT or
3423    SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT.  */
3424
3425 /* Nonzero if the template arguments is actually a vector of vectors,
3426    rather than just a vector.  */
3427 #define TMPL_ARGS_HAVE_MULTIPLE_LEVELS(NODE)                 \
3428   (NODE && TREE_VEC_LENGTH (NODE) && TREE_VEC_ELT (NODE, 0)  \
3429    && TREE_CODE (TREE_VEC_ELT (NODE, 0)) == TREE_VEC)
3430
3431 /* The depth of a template argument vector.  When called directly by
3432    the parser, we use a TREE_LIST rather than a TREE_VEC to represent
3433    template arguments.  In fact, we may even see NULL_TREE if there
3434    are no template arguments.  In both of those cases, there is only
3435    one level of template arguments.  */
3436 #define TMPL_ARGS_DEPTH(NODE)                                   \
3437   (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (NODE) ? TREE_VEC_LENGTH (NODE) : 1)
3438
3439 /* The LEVELth level of the template ARGS.  The outermost level of
3440    args is level 1, not level 0.  */
3441 #define TMPL_ARGS_LEVEL(ARGS, LEVEL)            \
3442   (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (ARGS)        \
3443    ? TREE_VEC_ELT (ARGS, (LEVEL) - 1) : (ARGS))
3444
3445 /* Set the LEVELth level of the template ARGS to VAL.  This macro does
3446    not work with single-level argument vectors.  */
3447 #define SET_TMPL_ARGS_LEVEL(ARGS, LEVEL, VAL)   \
3448   (TREE_VEC_ELT (ARGS, (LEVEL) - 1) = (VAL))
3449
3450 /* Accesses the IDXth parameter in the LEVELth level of the ARGS.  */
3451 #define TMPL_ARG(ARGS, LEVEL, IDX)                              \
3452   (TREE_VEC_ELT (TMPL_ARGS_LEVEL (ARGS, LEVEL), IDX))
3453
3454 /* Given a single level of template arguments in NODE, return the
3455    number of arguments.  */
3456 #define NUM_TMPL_ARGS(NODE)                             \
3457   (TREE_VEC_LENGTH (NODE))
3458
3459 /* Returns the innermost level of template arguments in ARGS.  */
3460 #define INNERMOST_TEMPLATE_ARGS(NODE) \
3461   (get_innermost_template_args ((NODE), 1))
3462
3463 /* The number of levels of template parameters given by NODE.  */
3464 #define TMPL_PARMS_DEPTH(NODE) \
3465   ((HOST_WIDE_INT) TREE_INT_CST_LOW (TREE_PURPOSE (NODE)))
3466
3467 /* The TEMPLATE_DECL instantiated or specialized by NODE.  This
3468    TEMPLATE_DECL will be the immediate parent, not the most general
3469    template.  For example, in:
3470
3471       template <class T> struct S { template <class U> void f(U); }
3472
3473    the FUNCTION_DECL for S<int>::f<double> will have, as its
3474    DECL_TI_TEMPLATE, `template <class U> S<int>::f<U>'.
3475
3476    As a special case, for a member friend template of a template
3477    class, this value will not be a TEMPLATE_DECL, but rather an
3478    IDENTIFIER_NODE or OVERLOAD indicating the name of the template and
3479    any explicit template arguments provided.  For example, in:
3480
3481      template <class T> struct S { friend void f<int>(int, double); }
3482
3483    the DECL_TI_TEMPLATE will be an IDENTIFIER_NODE for `f' and the
3484    DECL_TI_ARGS will be {int}.
3485
3486    For a FIELD_DECL with a non-static data member initializer, this value
3487    is the FIELD_DECL it was instantiated from.  */
3488 #define DECL_TI_TEMPLATE(NODE)      TI_TEMPLATE (DECL_TEMPLATE_INFO (NODE))
3489
3490 /* The template arguments used to obtain this decl from the most
3491    general form of DECL_TI_TEMPLATE.  For the example given for
3492    DECL_TI_TEMPLATE, the DECL_TI_ARGS will be {int, double}.  These
3493    are always the full set of arguments required to instantiate this
3494    declaration from the most general template specialized here.  */
3495 #define DECL_TI_ARGS(NODE)          TI_ARGS (DECL_TEMPLATE_INFO (NODE))
3496
3497 /* The TEMPLATE_DECL associated with NODE, a class type.  Even if NODE
3498    will be generated from a partial specialization, the TEMPLATE_DECL
3499    referred to here will be the original template.  For example,
3500    given:
3501
3502       template <typename T> struct S {};
3503       template <typename T> struct S<T*> {};
3504
3505    the CLASSTPYE_TI_TEMPLATE for S<int*> will be S, not the S<T*>.  */
3506 #define CLASSTYPE_TI_TEMPLATE(NODE) TI_TEMPLATE (CLASSTYPE_TEMPLATE_INFO (NODE))
3507 #define CLASSTYPE_TI_ARGS(NODE)     TI_ARGS (CLASSTYPE_TEMPLATE_INFO (NODE))
3508
3509 /* For a template instantiation TYPE, returns the TYPE corresponding
3510    to the primary template.  Otherwise returns TYPE itself.  */
3511 #define CLASSTYPE_PRIMARY_TEMPLATE_TYPE(TYPE)                           \
3512   ((CLASSTYPE_USE_TEMPLATE ((TYPE))                                     \
3513     && !CLASSTYPE_TEMPLATE_SPECIALIZATION ((TYPE)))                     \
3514    ? TREE_TYPE (DECL_TEMPLATE_RESULT (DECL_PRIMARY_TEMPLATE             \
3515                                       (CLASSTYPE_TI_TEMPLATE ((TYPE))))) \
3516    : (TYPE))
3517
3518 /* Like CLASS_TI_TEMPLATE, but also works for ENUMERAL_TYPEs.  */
3519 #define TYPE_TI_TEMPLATE(NODE)                  \
3520   (TI_TEMPLATE (TYPE_TEMPLATE_INFO (NODE)))
3521
3522 /* Like DECL_TI_ARGS, but for an ENUMERAL_, RECORD_, or UNION_TYPE.  */
3523 #define TYPE_TI_ARGS(NODE)                      \
3524   (TI_ARGS (TYPE_TEMPLATE_INFO (NODE)))
3525
3526 #define INNERMOST_TEMPLATE_PARMS(NODE)  TREE_VALUE (NODE)
3527
3528 /* Nonzero if NODE (a TEMPLATE_DECL) is a member template, in the
3529    sense of [temp.mem].  */
3530 #define DECL_MEMBER_TEMPLATE_P(NODE) \
3531   (DECL_LANG_FLAG_1 (TEMPLATE_DECL_CHECK (NODE)))
3532
3533 /* Nonzero if the NODE corresponds to the template parameters for a
3534    member template, whose inline definition is being processed after
3535    the class definition is complete.  */
3536 #define TEMPLATE_PARMS_FOR_INLINE(NODE) TREE_LANG_FLAG_1 (NODE)
3537
3538 /* Determine if a declaration (PARM_DECL or FIELD_DECL) is a pack.  */
3539 #define DECL_PACK_P(NODE) \
3540   (DECL_P (NODE) && PACK_EXPANSION_P (TREE_TYPE (NODE)))
3541
3542 /* Determines if NODE is an expansion of one or more parameter packs,
3543    e.g., a TYPE_PACK_EXPANSION or EXPR_PACK_EXPANSION.  */
3544 #define PACK_EXPANSION_P(NODE)                 \
3545   (TREE_CODE (NODE) == TYPE_PACK_EXPANSION     \
3546    || TREE_CODE (NODE) == EXPR_PACK_EXPANSION)
3547
3548 /* Extracts the type or expression pattern from a TYPE_PACK_EXPANSION or
3549    EXPR_PACK_EXPANSION.  */
3550 #define PACK_EXPANSION_PATTERN(NODE)                            \
3551   (TREE_CODE (NODE) == TYPE_PACK_EXPANSION ? TREE_TYPE (NODE)    \
3552    : TREE_OPERAND (NODE, 0))
3553
3554 /* Sets the type or expression pattern for a TYPE_PACK_EXPANSION or
3555    EXPR_PACK_EXPANSION.  */
3556 #define SET_PACK_EXPANSION_PATTERN(NODE,VALUE)  \
3557   if (TREE_CODE (NODE) == TYPE_PACK_EXPANSION)  \
3558     TREE_TYPE (NODE) = VALUE;                   \
3559   else                                          \
3560     TREE_OPERAND (NODE, 0) = VALUE
3561
3562 /* The list of parameter packs used in the PACK_EXPANSION_* node. The
3563    TREE_VALUE of each TREE_LIST contains the parameter packs.  */
3564 #define PACK_EXPANSION_PARAMETER_PACKS(NODE)            \
3565   *(TREE_CODE (NODE) == EXPR_PACK_EXPANSION             \
3566     ? &TREE_OPERAND (NODE, 1)                           \
3567     : &TYPE_MIN_VALUE_RAW (TYPE_PACK_EXPANSION_CHECK (NODE)))
3568
3569 /* Any additional template args to be applied when substituting into
3570    the pattern, set by tsubst_pack_expansion for partial instantiations.
3571    If this is a TREE_LIST, the TREE_VALUE of the first element is the
3572    usual template argument TREE_VEC, and the TREE_PURPOSE of later elements
3573    are enclosing functions that provided function parameter packs we'll need
3574    to map appropriately.  */
3575 #define PACK_EXPANSION_EXTRA_ARGS(NODE)         \
3576   *(TREE_CODE (NODE) == TYPE_PACK_EXPANSION     \
3577     ? &TYPE_MAX_VALUE_RAW (NODE)                        \
3578     : &TREE_OPERAND ((NODE), 2))
3579
3580 /* True iff this pack expansion is within a function context.  */
3581 #define PACK_EXPANSION_LOCAL_P(NODE) TREE_LANG_FLAG_0 (NODE)
3582
3583 /* True iff this pack expansion is for sizeof....  */
3584 #define PACK_EXPANSION_SIZEOF_P(NODE) TREE_LANG_FLAG_1 (NODE)
3585
3586 /* True iff the wildcard can match a template parameter pack.  */
3587 #define WILDCARD_PACK_P(NODE) TREE_LANG_FLAG_0 (NODE)
3588
3589 /* Determine if this is an argument pack.  */
3590 #define ARGUMENT_PACK_P(NODE)                          \
3591   (TREE_CODE (NODE) == TYPE_ARGUMENT_PACK              \
3592    || TREE_CODE (NODE) == NONTYPE_ARGUMENT_PACK)
3593
3594 /* The arguments stored in an argument pack. Arguments are stored in a
3595    TREE_VEC, which may have length zero.  */
3596 #define ARGUMENT_PACK_ARGS(NODE)                               \
3597   (TREE_CODE (NODE) == TYPE_ARGUMENT_PACK? TREE_TYPE (NODE)    \
3598    : TREE_OPERAND (NODE, 0))
3599
3600 /* Set the arguments stored in an argument pack. VALUE must be a
3601    TREE_VEC.  */
3602 #define SET_ARGUMENT_PACK_ARGS(NODE,VALUE)     \
3603   if (TREE_CODE (NODE) == TYPE_ARGUMENT_PACK)  \
3604     TREE_TYPE (NODE) = VALUE;                           \
3605   else                                                  \
3606     TREE_OPERAND (NODE, 0) = VALUE
3607
3608 /* Whether the argument pack is "incomplete", meaning that more
3609    arguments can still be deduced. Incomplete argument packs are only
3610    used when the user has provided an explicit template argument list
3611    for a variadic function template. Some of the explicit template
3612    arguments will be placed into the beginning of the argument pack,
3613    but additional arguments might still be deduced.  */
3614 #define ARGUMENT_PACK_INCOMPLETE_P(NODE)        \
3615   TREE_ADDRESSABLE (ARGUMENT_PACK_ARGS (NODE))
3616
3617 /* When ARGUMENT_PACK_INCOMPLETE_P, stores the explicit template
3618    arguments used to fill this pack.  */
3619 #define ARGUMENT_PACK_EXPLICIT_ARGS(NODE)       \
3620   TREE_TYPE (ARGUMENT_PACK_ARGS (NODE))
3621
3622 /* In an ARGUMENT_PACK_SELECT, the argument pack from which an
3623    argument will be selected.  */
3624 #define ARGUMENT_PACK_SELECT_FROM_PACK(NODE)                            \
3625   (((struct tree_argument_pack_select *)ARGUMENT_PACK_SELECT_CHECK (NODE))->argument_pack)
3626
3627 /* In an ARGUMENT_PACK_SELECT, the index of the argument we want to
3628    select.  */
3629 #define ARGUMENT_PACK_SELECT_INDEX(NODE)                                \
3630   (((struct tree_argument_pack_select *)ARGUMENT_PACK_SELECT_CHECK (NODE))->index)
3631
3632 #define FOLD_EXPR_CHECK(NODE)                                           \
3633   TREE_CHECK4 (NODE, UNARY_LEFT_FOLD_EXPR, UNARY_RIGHT_FOLD_EXPR,       \
3634                BINARY_LEFT_FOLD_EXPR, BINARY_RIGHT_FOLD_EXPR)
3635
3636 #define BINARY_FOLD_EXPR_CHECK(NODE) \
3637   TREE_CHECK2 (NODE, BINARY_LEFT_FOLD_EXPR, BINARY_RIGHT_FOLD_EXPR)
3638
3639 /* True if NODE is UNARY_FOLD_EXPR or a BINARY_FOLD_EXPR */
3640 #define FOLD_EXPR_P(NODE)                               \
3641   (TREE_CODE (NODE) == UNARY_LEFT_FOLD_EXPR             \
3642    || TREE_CODE (NODE) == UNARY_RIGHT_FOLD_EXPR         \
3643    || TREE_CODE (NODE) == BINARY_LEFT_FOLD_EXPR         \
3644    || TREE_CODE (NODE) == BINARY_RIGHT_FOLD_EXPR)
3645
3646 /* True when NODE is a fold over a compound assignment operator. */
3647 #define FOLD_EXPR_MODIFY_P(NODE) \
3648   TREE_LANG_FLAG_0 (FOLD_EXPR_CHECK (NODE))
3649
3650 /* An INTEGER_CST containing the tree code of the folded operator. */
3651 #define FOLD_EXPR_OP(NODE) \
3652   TREE_OPERAND (FOLD_EXPR_CHECK (NODE), 0)
3653
3654 /* The expression containing an unexpanded parameter pack. */
3655 #define FOLD_EXPR_PACK(NODE) \
3656   TREE_OPERAND (FOLD_EXPR_CHECK (NODE), 1)
3657
3658 /* In a binary fold expression, the argument with no unexpanded
3659    parameter packs. */
3660 #define FOLD_EXPR_INIT(NODE) \
3661   TREE_OPERAND (BINARY_FOLD_EXPR_CHECK (NODE), 2)
3662
3663 /* In a FUNCTION_DECL, the saved language-specific per-function data.  */
3664 #define DECL_SAVED_FUNCTION_DATA(NODE)                  \
3665   (LANG_DECL_FN_CHECK (FUNCTION_DECL_CHECK (NODE))      \
3666    ->u.saved_language_function)
3667
3668 /* True if NODE is an implicit INDIRECT_REF from convert_from_reference.  */
3669 #define REFERENCE_REF_P(NODE)                           \
3670   (INDIRECT_REF_P (NODE)                                \
3671    && TREE_TYPE (TREE_OPERAND (NODE, 0))                \
3672    && TYPE_REF_P (TREE_TYPE (TREE_OPERAND ((NODE), 0))))
3673
3674 /* True if NODE is a REFERENCE_TYPE which is OK to instantiate to be a
3675    reference to VLA type, because it's used for VLA capture.  */
3676 #define REFERENCE_VLA_OK(NODE) \
3677   (TYPE_LANG_FLAG_5 (REFERENCE_TYPE_CHECK (NODE)))
3678
3679 #define NEW_EXPR_USE_GLOBAL(NODE) \
3680   TREE_LANG_FLAG_0 (NEW_EXPR_CHECK (NODE))
3681 #define DELETE_EXPR_USE_GLOBAL(NODE) \
3682   TREE_LANG_FLAG_0 (DELETE_EXPR_CHECK (NODE))
3683 #define DELETE_EXPR_USE_VEC(NODE) \
3684   TREE_LANG_FLAG_1 (DELETE_EXPR_CHECK (NODE))
3685
3686 #define CALL_OR_AGGR_INIT_CHECK(NODE) \
3687   TREE_CHECK2 ((NODE), CALL_EXPR, AGGR_INIT_EXPR)
3688
3689 /* Indicates that this is a non-dependent COMPOUND_EXPR which will
3690    resolve to a function call.  */
3691 #define COMPOUND_EXPR_OVERLOADED(NODE) \
3692   TREE_LANG_FLAG_0 (COMPOUND_EXPR_CHECK (NODE))
3693
3694 /* In a CALL_EXPR appearing in a template, true if Koenig lookup
3695    should be performed at instantiation time.  */
3696 #define KOENIG_LOOKUP_P(NODE) TREE_LANG_FLAG_0 (CALL_EXPR_CHECK (NODE))
3697
3698 /* True if the arguments to NODE should be evaluated in left-to-right
3699    order regardless of PUSH_ARGS_REVERSED.  */
3700 #define CALL_EXPR_ORDERED_ARGS(NODE) \
3701   TREE_LANG_FLAG_3 (CALL_OR_AGGR_INIT_CHECK (NODE))
3702
3703 /* True if the arguments to NODE should be evaluated in right-to-left
3704    order regardless of PUSH_ARGS_REVERSED.  */
3705 #define CALL_EXPR_REVERSE_ARGS(NODE) \
3706   TREE_LANG_FLAG_5 (CALL_OR_AGGR_INIT_CHECK (NODE))
3707
3708 /* True if CALL_EXPR was written as an operator expression, not a function
3709    call.  */
3710 #define CALL_EXPR_OPERATOR_SYNTAX(NODE) \
3711   TREE_LANG_FLAG_6 (CALL_OR_AGGR_INIT_CHECK (NODE))
3712
3713 /* Indicates whether a string literal has been parenthesized. Such
3714    usages are disallowed in certain circumstances.  */
3715
3716 #define PAREN_STRING_LITERAL_P(NODE) \
3717   TREE_LANG_FLAG_0 (STRING_CST_CHECK (NODE))
3718
3719 /* Indicates whether a COMPONENT_REF or a SCOPE_REF has been parenthesized, or
3720    an INDIRECT_REF comes from parenthesizing a _DECL.  Currently only set some
3721    of the time in C++14 mode.  */
3722
3723 #define REF_PARENTHESIZED_P(NODE) \
3724   TREE_LANG_FLAG_2 (TREE_CHECK4 ((NODE), COMPONENT_REF, INDIRECT_REF, SCOPE_REF, VIEW_CONVERT_EXPR))
3725
3726 /* Nonzero if this AGGR_INIT_EXPR provides for initialization via a
3727    constructor call, rather than an ordinary function call.  */
3728 #define AGGR_INIT_VIA_CTOR_P(NODE) \
3729   TREE_LANG_FLAG_0 (AGGR_INIT_EXPR_CHECK (NODE))
3730
3731 /* Nonzero if expanding this AGGR_INIT_EXPR should first zero-initialize
3732    the object.  */
3733 #define AGGR_INIT_ZERO_FIRST(NODE) \
3734   TREE_LANG_FLAG_2 (AGGR_INIT_EXPR_CHECK (NODE))
3735
3736 /* Nonzero means that the call is the jump from a thunk to the
3737    thunked-to function.  */
3738 #define AGGR_INIT_FROM_THUNK_P(NODE) \
3739   (AGGR_INIT_EXPR_CHECK (NODE)->base.protected_flag)
3740
3741 /* AGGR_INIT_EXPR accessors.  These are equivalent to the CALL_EXPR
3742    accessors, except for AGGR_INIT_EXPR_SLOT (which takes the place of
3743    CALL_EXPR_STATIC_CHAIN).  */
3744
3745 #define AGGR_INIT_EXPR_FN(NODE) TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), 1)
3746 #define AGGR_INIT_EXPR_SLOT(NODE) \
3747   TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), 2)
3748 #define AGGR_INIT_EXPR_ARG(NODE, I) \
3749   TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), (I) + 3)
3750 #define aggr_init_expr_nargs(NODE) (VL_EXP_OPERAND_LENGTH(NODE) - 3)
3751
3752 /* AGGR_INIT_EXPR_ARGP returns a pointer to the argument vector for NODE.
3753    We can't use &AGGR_INIT_EXPR_ARG (NODE, 0) because that will complain if
3754    the argument count is zero when checking is enabled.  Instead, do
3755    the pointer arithmetic to advance past the 3 fixed operands in a
3756    AGGR_INIT_EXPR.  That produces a valid pointer to just past the end of
3757    the operand array, even if it's not valid to dereference it.  */
3758 #define AGGR_INIT_EXPR_ARGP(NODE) \
3759   (&(TREE_OPERAND (AGGR_INIT_EXPR_CHECK (NODE), 0)) + 3)
3760
3761 /* Abstract iterators for AGGR_INIT_EXPRs.  */
3762
3763 /* Structure containing iterator state.  */
3764 struct aggr_init_expr_arg_iterator {
3765   tree t;       /* the aggr_init_expr */
3766   int n;        /* argument count */
3767   int i;        /* next argument index */
3768 };
3769
3770 /* Initialize the abstract argument list iterator object ITER with the
3771    arguments from AGGR_INIT_EXPR node EXP.  */
3772 inline void
3773 init_aggr_init_expr_arg_iterator (tree exp,
3774                                        aggr_init_expr_arg_iterator *iter)
3775 {
3776   iter->t = exp;
3777   iter->n = aggr_init_expr_nargs (exp);
3778   iter->i = 0;
3779 }
3780
3781 /* Return the next argument from abstract argument list iterator object ITER,
3782    and advance its state.  Return NULL_TREE if there are no more arguments.  */
3783 inline tree
3784 next_aggr_init_expr_arg (aggr_init_expr_arg_iterator *iter)
3785 {
3786   tree result;
3787   if (iter->i >= iter->n)
3788     return NULL_TREE;
3789   result = AGGR_INIT_EXPR_ARG (iter->t, iter->i);
3790   iter->i++;
3791   return result;
3792 }
3793
3794 /* Initialize the abstract argument list iterator object ITER, then advance
3795    past and return the first argument.  Useful in for expressions, e.g.
3796      for (arg = first_aggr_init_expr_arg (exp, &iter); arg;
3797           arg = next_aggr_init_expr_arg (&iter))   */
3798 inline tree
3799 first_aggr_init_expr_arg (tree exp, aggr_init_expr_arg_iterator *iter)
3800 {
3801   init_aggr_init_expr_arg_iterator (exp, iter);
3802   return next_aggr_init_expr_arg (iter);
3803 }
3804
3805 /* Test whether there are more arguments in abstract argument list iterator
3806    ITER, without changing its state.  */
3807 inline bool
3808 more_aggr_init_expr_args_p (const aggr_init_expr_arg_iterator *iter)
3809 {
3810   return (iter->i < iter->n);
3811 }
3812
3813 /* Iterate through each argument ARG of AGGR_INIT_EXPR CALL, using variable
3814    ITER (of type aggr_init_expr_arg_iterator) to hold the iteration state.  */
3815 #define FOR_EACH_AGGR_INIT_EXPR_ARG(arg, iter, call)                    \
3816   for ((arg) = first_aggr_init_expr_arg ((call), &(iter)); (arg);       \
3817        (arg) = next_aggr_init_expr_arg (&(iter)))
3818
3819 /* VEC_INIT_EXPR accessors.  */
3820 #define VEC_INIT_EXPR_SLOT(NODE) TREE_OPERAND (VEC_INIT_EXPR_CHECK (NODE), 0)
3821 #define VEC_INIT_EXPR_INIT(NODE) TREE_OPERAND (VEC_INIT_EXPR_CHECK (NODE), 1)
3822
3823 /* Indicates that a VEC_INIT_EXPR is a potential constant expression.
3824    Only set when the current function is constexpr.  */
3825 #define VEC_INIT_EXPR_IS_CONSTEXPR(NODE) \
3826   TREE_LANG_FLAG_0 (VEC_INIT_EXPR_CHECK (NODE))
3827
3828 /* Indicates that a VEC_INIT_EXPR is expressing value-initialization.  */
3829 #define VEC_INIT_EXPR_VALUE_INIT(NODE) \
3830   TREE_LANG_FLAG_1 (VEC_INIT_EXPR_CHECK (NODE))
3831
3832 /* The condition under which this MUST_NOT_THROW_EXPR actually blocks
3833    exceptions.  NULL_TREE means 'true'.  */
3834 #define MUST_NOT_THROW_COND(NODE) \
3835   TREE_OPERAND (MUST_NOT_THROW_EXPR_CHECK (NODE), 1)
3836
3837 /* The TYPE_MAIN_DECL for a class template type is a TYPE_DECL, not a
3838    TEMPLATE_DECL.  This macro determines whether or not a given class
3839    type is really a template type, as opposed to an instantiation or
3840    specialization of one.  */
3841 #define CLASSTYPE_IS_TEMPLATE(NODE)  \
3842   (CLASSTYPE_TEMPLATE_INFO (NODE)    \
3843    && !CLASSTYPE_USE_TEMPLATE (NODE) \
3844    && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (NODE)))
3845
3846 /* The name used by the user to name the typename type.  Typically,
3847    this is an IDENTIFIER_NODE, and the same as the DECL_NAME on the
3848    corresponding TYPE_DECL.  However, this may also be a
3849    TEMPLATE_ID_EXPR if we had something like `typename X::Y<T>'.  */
3850 #define TYPENAME_TYPE_FULLNAME(NODE) \
3851   (TYPE_VALUES_RAW (TYPENAME_TYPE_CHECK (NODE)))
3852
3853 /* True if a TYPENAME_TYPE was declared as an "enum".  */
3854 #define TYPENAME_IS_ENUM_P(NODE) \
3855   (TREE_LANG_FLAG_0 (TYPENAME_TYPE_CHECK (NODE)))
3856
3857 /* True if a TYPENAME_TYPE was declared as a "class", "struct", or
3858    "union".  */
3859 #define TYPENAME_IS_CLASS_P(NODE) \
3860   (TREE_LANG_FLAG_1 (TYPENAME_TYPE_CHECK (NODE)))
3861
3862 /* True if a TYPENAME_TYPE is in the process of being resolved.  */
3863 #define TYPENAME_IS_RESOLVING_P(NODE) \
3864   (TREE_LANG_FLAG_2 (TYPENAME_TYPE_CHECK (NODE)))
3865
3866 /* [class.virtual]
3867
3868    A class that declares or inherits a virtual function is called a
3869    polymorphic class.  */
3870 #define TYPE_POLYMORPHIC_P(NODE) (TREE_LANG_FLAG_2 (NODE))
3871
3872 /* Nonzero if this class has a virtual function table pointer.  */
3873 #define TYPE_CONTAINS_VPTR_P(NODE)              \
3874   (TYPE_POLYMORPHIC_P (NODE) || CLASSTYPE_VBASECLASSES (NODE))
3875
3876 /* Nonzero if NODE is a FUNCTION_DECL (for a function with global
3877    scope) declared in a local scope.  */
3878 #define DECL_LOCAL_FUNCTION_P(NODE) \
3879   DECL_LANG_FLAG_0 (FUNCTION_DECL_CHECK (NODE))
3880
3881 /* Nonzero if NODE is the target for genericization of 'break' stmts.  */
3882 #define LABEL_DECL_BREAK(NODE) \
3883   DECL_LANG_FLAG_0 (LABEL_DECL_CHECK (NODE))
3884
3885 /* Nonzero if NODE is the target for genericization of 'continue' stmts.  */
3886 #define LABEL_DECL_CONTINUE(NODE) \
3887   DECL_LANG_FLAG_1 (LABEL_DECL_CHECK (NODE))
3888
3889 /* Nonzero if NODE is the target for genericization of 'return' stmts
3890    in constructors/destructors of targetm.cxx.cdtor_returns_this targets.  */
3891 #define LABEL_DECL_CDTOR(NODE) \
3892   DECL_LANG_FLAG_2 (LABEL_DECL_CHECK (NODE))
3893
3894 /* True if NODE was declared with auto in its return type, but it has
3895    started compilation and so the return type might have been changed by
3896    return type deduction; its declared return type should be found in
3897    DECL_STRUCT_FUNCTION(NODE)->language->x_auto_return_pattern.  */
3898 #define FNDECL_USED_AUTO(NODE) \
3899   TREE_LANG_FLAG_2 (FUNCTION_DECL_CHECK (NODE))
3900
3901 /* Nonzero if NODE is a DECL which we know about but which has not
3902    been explicitly declared, such as a built-in function or a friend
3903    declared inside a class.  In the latter case DECL_HIDDEN_FRIEND_P
3904    will be set.  */
3905 #define DECL_ANTICIPATED(NODE) \
3906   (DECL_LANG_SPECIFIC (TYPE_FUNCTION_OR_TEMPLATE_DECL_CHECK (NODE)) \
3907    ->u.base.anticipated_p)
3908
3909 /* Is DECL NODE a hidden name?  */
3910 #define DECL_HIDDEN_P(NODE) \
3911   (DECL_LANG_SPECIFIC (NODE) && TYPE_FUNCTION_OR_TEMPLATE_DECL_P (NODE) \
3912    && DECL_ANTICIPATED (NODE))
3913
3914 /* True if this is a hidden class type.    */
3915 #define TYPE_HIDDEN_P(NODE) \
3916   (DECL_LANG_SPECIFIC (TYPE_NAME (NODE)) \
3917    && DECL_ANTICIPATED (TYPE_NAME (NODE)))
3918
3919 /* True for artificial decls added for OpenMP privatized non-static
3920    data members.  */
3921 #define DECL_OMP_PRIVATIZED_MEMBER(NODE) \
3922   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.anticipated_p)
3923
3924 /* Nonzero if NODE is a FUNCTION_DECL which was declared as a friend
3925    within a class but has not been declared in the surrounding scope.
3926    The function is invisible except via argument dependent lookup.  */
3927 #define DECL_HIDDEN_FRIEND_P(NODE) \
3928   (LANG_DECL_FN_CHECK (DECL_COMMON_CHECK (NODE))->hidden_friend_p)
3929
3930 /* Nonzero if NODE is an artificial FUNCTION_DECL for
3931    #pragma omp declare reduction.  */
3932 #define DECL_OMP_DECLARE_REDUCTION_P(NODE) \
3933   (LANG_DECL_FN_CHECK (DECL_COMMON_CHECK (NODE))->omp_declare_reduction_p)
3934
3935 /* Nonzero if DECL has been declared threadprivate by
3936    #pragma omp threadprivate.  */
3937 #define CP_DECL_THREADPRIVATE_P(DECL) \
3938   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (DECL))->u.base.threadprivate_or_deleted_p)
3939
3940 /* Nonzero if NODE is a VAR_DECL which has been declared inline.  */
3941 #define DECL_VAR_DECLARED_INLINE_P(NODE) \
3942   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))                   \
3943    ? DECL_LANG_SPECIFIC (NODE)->u.base.var_declared_inline_p    \
3944    : false)
3945 #define SET_DECL_VAR_DECLARED_INLINE_P(NODE) \
3946   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.var_declared_inline_p \
3947    = true)
3948
3949 /* True if NODE is a constant variable with a value-dependent initializer.  */
3950 #define DECL_DEPENDENT_INIT_P(NODE)                             \
3951   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))                   \
3952    && DECL_LANG_SPECIFIC (NODE)->u.base.dependent_init_p)
3953 #define SET_DECL_DEPENDENT_INIT_P(NODE, X) \
3954   (DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))->u.base.dependent_init_p = (X))
3955
3956 /* Nonzero if NODE is an artificial VAR_DECL for a C++17 structured binding
3957    declaration or one of VAR_DECLs for the user identifiers in it.  */
3958 #define DECL_DECOMPOSITION_P(NODE) \
3959   (VAR_P (NODE) && DECL_LANG_SPECIFIC (NODE)                    \
3960    ? DECL_LANG_SPECIFIC (NODE)->u.base.selector == lds_decomp           \
3961    : false)
3962
3963 /* The underlying artificial VAR_DECL for structured binding.  */
3964 #define DECL_DECOMP_BASE(NODE) \
3965   (LANG_DECL_DECOMP_CHECK (NODE)->base)
3966
3967 /* Nonzero if NODE is an inline VAR_DECL.  In C++17, static data members
3968    declared with constexpr specifier are implicitly inline variables.  */
3969 #define DECL_INLINE_VAR_P(NODE) \
3970   (DECL_VAR_DECLARED_INLINE_P (NODE)                            \
3971    || (cxx_dialect >= cxx17                                     \
3972        && DECL_DECLARED_CONSTEXPR_P (NODE)                      \
3973        && DECL_CLASS_SCOPE_P (NODE)))
3974
3975 /* Nonzero if DECL was declared with '= delete'.  */
3976 #define DECL_DELETED_FN(DECL) \
3977   (LANG_DECL_FN_CHECK (DECL)->min.base.threadprivate_or_deleted_p)
3978
3979 /* Nonzero if DECL was declared with '= default' (maybe implicitly).  */
3980 #define DECL_DEFAULTED_FN(DECL) \
3981   (LANG_DECL_FN_CHECK (DECL)->defaulted_p)
3982
3983 /* Nonzero if DECL is explicitly defaulted in the class body.  */
3984 #define DECL_DEFAULTED_IN_CLASS_P(DECL)                                 \
3985   (DECL_DEFAULTED_FN (DECL) && DECL_INITIALIZED_IN_CLASS_P (DECL))
3986 /* Nonzero if DECL was defaulted outside the class body.  */
3987 #define DECL_DEFAULTED_OUTSIDE_CLASS_P(DECL)                            \
3988   (DECL_DEFAULTED_FN (DECL)                                             \
3989    && !(DECL_ARTIFICIAL (DECL) || DECL_INITIALIZED_IN_CLASS_P (DECL)))
3990
3991 /* Record whether a typedef for type `int' was actually `signed int'.  */
3992 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
3993
3994 /* Returns nonzero if DECL has external linkage, as specified by the
3995    language standard.  (This predicate may hold even when the
3996    corresponding entity is not actually given external linkage in the
3997    object file; see decl_linkage for details.)  */
3998 #define DECL_EXTERNAL_LINKAGE_P(DECL) \
3999   (decl_linkage (DECL) == lk_external)
4000
4001 /* Keep these codes in ascending code order.  */
4002
4003 #define INTEGRAL_CODE_P(CODE)   \
4004   ((CODE) == ENUMERAL_TYPE      \
4005    || (CODE) == BOOLEAN_TYPE    \
4006    || (CODE) == INTEGER_TYPE)
4007
4008 /* [basic.fundamental]
4009
4010    Types  bool, char, wchar_t, and the signed and unsigned integer types
4011    are collectively called integral types.
4012
4013    Note that INTEGRAL_TYPE_P, as defined in tree.h, allows enumeration
4014    types as well, which is incorrect in C++.  Keep these checks in
4015    ascending code order.  */
4016 #define CP_INTEGRAL_TYPE_P(TYPE)                \
4017   (TREE_CODE (TYPE) == BOOLEAN_TYPE             \
4018    || TREE_CODE (TYPE) == INTEGER_TYPE)
4019
4020 /* Returns true if TYPE is an integral or enumeration name.  Keep
4021    these checks in ascending code order.  */
4022 #define INTEGRAL_OR_ENUMERATION_TYPE_P(TYPE) \
4023    (TREE_CODE (TYPE) == ENUMERAL_TYPE || CP_INTEGRAL_TYPE_P (TYPE))
4024
4025 /* Returns true if TYPE is an integral or unscoped enumeration type.  */
4026 #define INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P(TYPE) \
4027    (UNSCOPED_ENUM_P (TYPE) || CP_INTEGRAL_TYPE_P (TYPE))
4028
4029 /* True if the class type TYPE is a literal type.  */
4030 #define CLASSTYPE_LITERAL_P(TYPE)              \
4031    (LANG_TYPE_CLASS_CHECK (TYPE)->is_literal)
4032
4033 /* [basic.fundamental]
4034
4035    Integral and floating types are collectively called arithmetic
4036    types.
4037
4038    As a GNU extension, we also accept complex types.
4039
4040    Keep these checks in ascending code order.  */
4041 #define ARITHMETIC_TYPE_P(TYPE) \
4042   (CP_INTEGRAL_TYPE_P (TYPE) \
4043    || TREE_CODE (TYPE) == REAL_TYPE \
4044    || TREE_CODE (TYPE) == COMPLEX_TYPE)
4045
4046 /* True iff TYPE is cv decltype(nullptr).  */
4047 #define NULLPTR_TYPE_P(TYPE) (TREE_CODE (TYPE) == NULLPTR_TYPE)
4048
4049 /* [basic.types]
4050
4051    Arithmetic types, enumeration types, pointer types,
4052    pointer-to-member types, and std::nullptr_t are collectively called
4053    scalar types.
4054
4055    Keep these checks in ascending code order.  */
4056 #define SCALAR_TYPE_P(TYPE)                     \
4057   (TYPE_PTRDATAMEM_P (TYPE)                     \
4058    || TREE_CODE (TYPE) == ENUMERAL_TYPE         \
4059    || ARITHMETIC_TYPE_P (TYPE)                  \
4060    || TYPE_PTR_P (TYPE)                         \
4061    || TYPE_PTRMEMFUNC_P (TYPE)                  \
4062    || NULLPTR_TYPE_P (TYPE))
4063
4064 /* Determines whether this type is a C++0x scoped enumeration
4065    type. Scoped enumerations types are introduced via "enum class" or
4066    "enum struct", e.g.,
4067
4068      enum class Color {
4069        Red, Green, Blue
4070      };
4071
4072    Scoped enumeration types are different from normal (unscoped)
4073    enumeration types in several ways:
4074
4075      - The enumerators of a scoped enumeration type are only available
4076        within the scope of the enumeration type and not in the
4077        enclosing scope. For example, the Red color can be referred to
4078        with "Color::Red" but not "Red".
4079
4080      - Scoped enumerators and enumerations do not implicitly convert
4081        to integers or 'bool'.
4082
4083      - The underlying type of the enum is well-defined.  */
4084 #define SCOPED_ENUM_P(TYPE)                                             \
4085   (TREE_CODE (TYPE) == ENUMERAL_TYPE && ENUM_IS_SCOPED (TYPE))
4086
4087 /* Determine whether this is an unscoped enumeration type.  */
4088 #define UNSCOPED_ENUM_P(TYPE)                                           \
4089   (TREE_CODE (TYPE) == ENUMERAL_TYPE && !ENUM_IS_SCOPED (TYPE))
4090
4091 /* Set the flag indicating whether an ENUMERAL_TYPE is a C++0x scoped
4092    enumeration type (1) or a normal (unscoped) enumeration type
4093    (0).  */
4094 #define SET_SCOPED_ENUM_P(TYPE, VAL)                    \
4095   (ENUM_IS_SCOPED (TYPE) = (VAL))
4096
4097 #define SET_OPAQUE_ENUM_P(TYPE, VAL)                    \
4098   (ENUM_IS_OPAQUE (TYPE) = (VAL))
4099
4100 #define OPAQUE_ENUM_P(TYPE)                             \
4101   (TREE_CODE (TYPE) == ENUMERAL_TYPE && ENUM_IS_OPAQUE (TYPE))
4102
4103 /* Determines whether an ENUMERAL_TYPE has an explicit
4104    underlying type.  */
4105 #define ENUM_FIXED_UNDERLYING_TYPE_P(NODE) (TYPE_LANG_FLAG_5 (NODE))
4106
4107 /* Returns the underlying type of the given enumeration type. The
4108    underlying type is determined in different ways, depending on the
4109    properties of the enum:
4110
4111      - In C++0x, the underlying type can be explicitly specified, e.g.,
4112
4113          enum E1 : char { ... } // underlying type is char
4114
4115      - In a C++0x scoped enumeration, the underlying type is int
4116        unless otherwises specified:
4117
4118          enum class E2 { ... } // underlying type is int
4119
4120      - Otherwise, the underlying type is determined based on the
4121        values of the enumerators. In this case, the
4122        ENUM_UNDERLYING_TYPE will not be set until after the definition
4123        of the enumeration is completed by finish_enum.  */
4124 #define ENUM_UNDERLYING_TYPE(TYPE) \
4125   TREE_TYPE (ENUMERAL_TYPE_CHECK (TYPE))
4126
4127 /* [dcl.init.aggr]
4128
4129    An aggregate is an array or a class with no user-provided
4130    constructors, no brace-or-equal-initializers for non-static data
4131    members, no private or protected non-static data members, no
4132    base classes, and no virtual functions.
4133
4134    As an extension, we also treat vectors as aggregates.  Keep these
4135    checks in ascending code order.  */
4136 #define CP_AGGREGATE_TYPE_P(TYPE)                               \
4137   (TREE_CODE (TYPE) == VECTOR_TYPE                              \
4138    ||TREE_CODE (TYPE) == ARRAY_TYPE                             \
4139    || (CLASS_TYPE_P (TYPE) && !CLASSTYPE_NON_AGGREGATE (TYPE)))
4140
4141 /* Nonzero for a class type means that the class type has a
4142    user-declared constructor.  */
4143 #define TYPE_HAS_USER_CONSTRUCTOR(NODE) (TYPE_LANG_FLAG_1 (NODE))
4144
4145 /* Nonzero means that the FUNCTION_TYPE or METHOD_TYPE has a
4146    late-specified return type.  */
4147 #define TYPE_HAS_LATE_RETURN_TYPE(NODE) \
4148   (TYPE_LANG_FLAG_2 (FUNC_OR_METHOD_CHECK (NODE)))
4149
4150 /* When appearing in an INDIRECT_REF, it means that the tree structure
4151    underneath is actually a call to a constructor.  This is needed
4152    when the constructor must initialize local storage (which can
4153    be automatically destroyed), rather than allowing it to allocate
4154    space from the heap.
4155
4156    When appearing in a SAVE_EXPR, it means that underneath
4157    is a call to a constructor.
4158
4159    When appearing in a CONSTRUCTOR, the expression is a
4160    compound literal.
4161
4162    When appearing in a FIELD_DECL, it means that this field
4163    has been duly initialized in its constructor.  */
4164 #define TREE_HAS_CONSTRUCTOR(NODE) (TREE_LANG_FLAG_4 (NODE))
4165
4166 /* True if NODE is a brace-enclosed initializer.  */
4167 #define BRACE_ENCLOSED_INITIALIZER_P(NODE) \
4168   (TREE_CODE (NODE) == CONSTRUCTOR && TREE_TYPE (NODE) == init_list_type_node)
4169
4170 /* True if NODE is a compound-literal, i.e., a brace-enclosed
4171    initializer cast to a particular type.  */
4172 #define COMPOUND_LITERAL_P(NODE) \
4173   (TREE_CODE (NODE) == CONSTRUCTOR && TREE_HAS_CONSTRUCTOR (NODE))
4174
4175 #define EMPTY_CONSTRUCTOR_P(NODE) (TREE_CODE (NODE) == CONSTRUCTOR \
4176                                    && vec_safe_is_empty(CONSTRUCTOR_ELTS(NODE))\
4177                                    && !TREE_HAS_CONSTRUCTOR (NODE))
4178
4179 /* True if NODE is a init-list used as a direct-initializer, i.e.
4180    B b{1,2}, not B b({1,2}) or B b = {1,2}.  */
4181 #define CONSTRUCTOR_IS_DIRECT_INIT(NODE) (TREE_LANG_FLAG_0 (CONSTRUCTOR_CHECK (NODE)))
4182
4183 /* True if this CONSTRUCTOR should not be used as a variable initializer
4184    because it was loaded from a constexpr variable with mutable fields.  */
4185 #define CONSTRUCTOR_MUTABLE_POISON(NODE) \
4186   (TREE_LANG_FLAG_2 (CONSTRUCTOR_CHECK (NODE)))
4187
4188 /* True if this typed CONSTRUCTOR represents C99 compound-literal syntax rather
4189    than C++11 functional cast syntax.  */
4190 #define CONSTRUCTOR_C99_COMPOUND_LITERAL(NODE) \
4191   (TREE_LANG_FLAG_3 (CONSTRUCTOR_CHECK (NODE)))
4192
4193 /* True if this CONSTRUCTOR contains PLACEHOLDER_EXPRs referencing the
4194    CONSTRUCTOR's type not nested inside another CONSTRUCTOR marked with
4195    CONSTRUCTOR_PLACEHOLDER_BOUNDARY.  */
4196 #define CONSTRUCTOR_PLACEHOLDER_BOUNDARY(NODE) \
4197   (TREE_LANG_FLAG_5 (CONSTRUCTOR_CHECK (NODE)))
4198
4199 #define DIRECT_LIST_INIT_P(NODE) \
4200    (BRACE_ENCLOSED_INITIALIZER_P (NODE) && CONSTRUCTOR_IS_DIRECT_INIT (NODE))
4201
4202 /* True if NODE represents a conversion for direct-initialization in a
4203    template.  Set by perform_implicit_conversion_flags.  */
4204 #define IMPLICIT_CONV_EXPR_DIRECT_INIT(NODE) \
4205   (TREE_LANG_FLAG_0 (IMPLICIT_CONV_EXPR_CHECK (NODE)))
4206
4207 /* True if NODE represents a dependent conversion of a non-type template
4208    argument.  Set by maybe_convert_nontype_argument.  */
4209 #define IMPLICIT_CONV_EXPR_NONTYPE_ARG(NODE) \
4210   (TREE_LANG_FLAG_1 (IMPLICIT_CONV_EXPR_CHECK (NODE)))
4211
4212 /* Nonzero means that an object of this type can not be initialized using
4213    an initializer list.  */
4214 #define CLASSTYPE_NON_AGGREGATE(NODE) \
4215   (LANG_TYPE_CLASS_CHECK (NODE)->non_aggregate)
4216 #define TYPE_NON_AGGREGATE_CLASS(NODE) \
4217   (CLASS_TYPE_P (NODE) && CLASSTYPE_NON_AGGREGATE (NODE))
4218
4219 /* Nonzero if there is a non-trivial X::op=(cv X&) for this class.  */
4220 #define TYPE_HAS_COMPLEX_COPY_ASSIGN(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_copy_assign)
4221
4222 /* Nonzero if there is a non-trivial X::X(cv X&) for this class.  */
4223 #define TYPE_HAS_COMPLEX_COPY_CTOR(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_copy_ctor)
4224
4225 /* Nonzero if there is a non-trivial X::op=(X&&) for this class.  */
4226 #define TYPE_HAS_COMPLEX_MOVE_ASSIGN(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_move_assign)
4227
4228 /* Nonzero if there is a non-trivial X::X(X&&) for this class.  */
4229 #define TYPE_HAS_COMPLEX_MOVE_CTOR(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_move_ctor)
4230
4231 /* Nonzero if there is no trivial default constructor for this class.  */
4232 #define TYPE_HAS_COMPLEX_DFLT(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->has_complex_dflt)
4233
4234 /* Nonzero if TYPE has a trivial destructor.  From [class.dtor]:
4235
4236      A destructor is trivial if it is an implicitly declared
4237      destructor and if:
4238
4239        - all of the direct base classes of its class have trivial
4240          destructors,
4241
4242        - for all of the non-static data members of its class that are
4243          of class type (or array thereof), each such class has a
4244          trivial destructor.  */
4245 #define TYPE_HAS_TRIVIAL_DESTRUCTOR(NODE) \
4246   (!TYPE_HAS_NONTRIVIAL_DESTRUCTOR (NODE))
4247
4248 /* Nonzero for _TYPE node means that this type does not have a trivial
4249    destructor.  Therefore, destroying an object of this type will
4250    involve a call to a destructor.  This can apply to objects of
4251    ARRAY_TYPE is the type of the elements needs a destructor.  */
4252 #define TYPE_HAS_NONTRIVIAL_DESTRUCTOR(NODE) \
4253   (TYPE_LANG_FLAG_4 (NODE))
4254
4255 /* Nonzero for class type means that the default constructor is trivial.  */
4256 #define TYPE_HAS_TRIVIAL_DFLT(NODE) \
4257   (TYPE_HAS_DEFAULT_CONSTRUCTOR (NODE) && ! TYPE_HAS_COMPLEX_DFLT (NODE))
4258
4259 /* Nonzero for class type means that copy initialization of this type can use
4260    a bitwise copy.  */
4261 #define TYPE_HAS_TRIVIAL_COPY_CTOR(NODE) \
4262   (TYPE_HAS_COPY_CTOR (NODE) && ! TYPE_HAS_COMPLEX_COPY_CTOR (NODE))
4263
4264 /* Nonzero for class type means that assignment of this type can use
4265    a bitwise copy.  */
4266 #define TYPE_HAS_TRIVIAL_COPY_ASSIGN(NODE) \
4267   (TYPE_HAS_COPY_ASSIGN (NODE) && ! TYPE_HAS_COMPLEX_COPY_ASSIGN (NODE))
4268
4269 /* Returns true if NODE is a pointer-to-data-member.  */
4270 #define TYPE_PTRDATAMEM_P(NODE)                 \
4271   (TREE_CODE (NODE) == OFFSET_TYPE)
4272
4273 /* Returns true if NODE is a pointer.  */
4274 #define TYPE_PTR_P(NODE)                        \
4275   (TREE_CODE (NODE) == POINTER_TYPE)
4276
4277 /* Returns true if NODE is a reference.  */
4278 #define TYPE_REF_P(NODE)                        \
4279   (TREE_CODE (NODE) == REFERENCE_TYPE)
4280
4281 /* Returns true if NODE is a pointer or a reference.  */
4282 #define INDIRECT_TYPE_P(NODE)                   \
4283   (TYPE_PTR_P (NODE) || TYPE_REF_P (NODE))
4284
4285 /* Returns true if NODE is an object type:
4286
4287      [basic.types]
4288
4289      An object type is a (possibly cv-qualified) type that is not a
4290      function type, not a reference type, and not a void type.
4291
4292    Keep these checks in ascending order, for speed.  */
4293 #define TYPE_OBJ_P(NODE)                        \
4294   (!TYPE_REF_P (NODE)                           \
4295    && !VOID_TYPE_P (NODE)                       \
4296    && TREE_CODE (NODE) != FUNCTION_TYPE         \
4297    && TREE_CODE (NODE) != METHOD_TYPE)
4298
4299 /* Returns true if NODE is a pointer to an object.  Keep these checks
4300    in ascending tree code order.  */
4301 #define TYPE_PTROB_P(NODE)                                      \
4302   (TYPE_PTR_P (NODE) && TYPE_OBJ_P (TREE_TYPE (NODE)))
4303
4304 /* Returns true if NODE is a reference to an object.  Keep these checks
4305    in ascending tree code order.  */
4306 #define TYPE_REF_OBJ_P(NODE)                                    \
4307   (TYPE_REF_P (NODE) && TYPE_OBJ_P (TREE_TYPE (NODE)))
4308
4309 /* Returns true if NODE is a pointer to an object, or a pointer to
4310    void.  Keep these checks in ascending tree code order.  */
4311 #define TYPE_PTROBV_P(NODE)                                     \
4312   (TYPE_PTR_P (NODE)                                            \
4313    && !(TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE           \
4314         || TREE_CODE (TREE_TYPE (NODE)) == METHOD_TYPE))
4315
4316 /* Returns true if NODE is a pointer to function type.  */
4317 #define TYPE_PTRFN_P(NODE)                              \
4318   (TYPE_PTR_P (NODE)                                    \
4319    && TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE)
4320
4321 /* Returns true if NODE is a reference to function type.  */
4322 #define TYPE_REFFN_P(NODE)                              \
4323   (TYPE_REF_P (NODE)                                    \
4324    && TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE)
4325
4326 /* Returns true if NODE is a pointer to member function type.  */
4327 #define TYPE_PTRMEMFUNC_P(NODE)         \
4328   (TREE_CODE (NODE) == RECORD_TYPE      \
4329    && TYPE_PTRMEMFUNC_FLAG (NODE))
4330
4331 #define TYPE_PTRMEMFUNC_FLAG(NODE) \
4332   (TYPE_LANG_FLAG_2 (RECORD_TYPE_CHECK (NODE)))
4333
4334 /* Returns true if NODE is a pointer-to-member.  */
4335 #define TYPE_PTRMEM_P(NODE) \
4336   (TYPE_PTRDATAMEM_P (NODE) || TYPE_PTRMEMFUNC_P (NODE))
4337
4338 /* Returns true if NODE is a pointer or a pointer-to-member.  */
4339 #define TYPE_PTR_OR_PTRMEM_P(NODE) \
4340   (TYPE_PTR_P (NODE) || TYPE_PTRMEM_P (NODE))
4341
4342 /* Indicates when overload resolution may resolve to a pointer to
4343    member function. [expr.unary.op]/3 */
4344 #define PTRMEM_OK_P(NODE) \
4345   TREE_LANG_FLAG_0 (TREE_CHECK3 ((NODE), ADDR_EXPR, OFFSET_REF, SCOPE_REF))
4346
4347 /* Get the POINTER_TYPE to the METHOD_TYPE associated with this
4348    pointer to member function.  TYPE_PTRMEMFUNC_P _must_ be true,
4349    before using this macro.  */
4350 #define TYPE_PTRMEMFUNC_FN_TYPE(NODE) \
4351   (cp_build_qualified_type (TREE_TYPE (TYPE_FIELDS (NODE)),\
4352                             cp_type_quals (NODE)))
4353
4354 /* As above, but can be used in places that want an lvalue at the expense
4355    of not necessarily having the correct cv-qualifiers.  */
4356 #define TYPE_PTRMEMFUNC_FN_TYPE_RAW(NODE) \
4357   (TREE_TYPE (TYPE_FIELDS (NODE)))
4358
4359 /* Returns `A' for a type like `int (A::*)(double)' */
4360 #define TYPE_PTRMEMFUNC_OBJECT_TYPE(NODE) \
4361   TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (NODE)))
4362
4363 /* The canonical internal RECORD_TYPE from the POINTER_TYPE to
4364    METHOD_TYPE.  */
4365 #define TYPE_PTRMEMFUNC_TYPE(NODE) \
4366   TYPE_LANG_SLOT_1 (NODE)
4367
4368 /* For a pointer-to-member type of the form `T X::*', this is `X'.
4369    For a type like `void (X::*)() const', this type is `X', not `const
4370    X'.  To get at the `const X' you have to look at the
4371    TYPE_PTRMEM_POINTED_TO_TYPE; there, the first parameter will have
4372    type `const X*'.  */
4373 #define TYPE_PTRMEM_CLASS_TYPE(NODE)                    \
4374   (TYPE_PTRDATAMEM_P (NODE)                                     \
4375    ? TYPE_OFFSET_BASETYPE (NODE)                \
4376    : TYPE_PTRMEMFUNC_OBJECT_TYPE (NODE))
4377
4378 /* For a pointer-to-member type of the form `T X::*', this is `T'.  */
4379 #define TYPE_PTRMEM_POINTED_TO_TYPE(NODE)               \
4380    (TYPE_PTRDATAMEM_P (NODE)                            \
4381     ? TREE_TYPE (NODE)                                  \
4382     : TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (NODE)))
4383
4384 /* For a pointer-to-member constant `X::Y' this is the RECORD_TYPE for
4385    `X'.  */
4386 #define PTRMEM_CST_CLASS(NODE) \
4387   TYPE_PTRMEM_CLASS_TYPE (TREE_TYPE (PTRMEM_CST_CHECK (NODE)))
4388
4389 /* For a pointer-to-member constant `X::Y' this is the _DECL for
4390    `Y'.  */
4391 #define PTRMEM_CST_MEMBER(NODE) \
4392   (((ptrmem_cst_t)PTRMEM_CST_CHECK (NODE))->member)
4393
4394 /* The expression in question for a TYPEOF_TYPE.  */
4395 #define TYPEOF_TYPE_EXPR(NODE) (TYPE_VALUES_RAW (TYPEOF_TYPE_CHECK (NODE)))
4396
4397 /* The type in question for an UNDERLYING_TYPE.  */
4398 #define UNDERLYING_TYPE_TYPE(NODE) \
4399   (TYPE_VALUES_RAW (UNDERLYING_TYPE_CHECK (NODE)))
4400
4401 /* The type in question for BASES.  */
4402 #define BASES_TYPE(NODE) \
4403   (TYPE_VALUES_RAW (BASES_CHECK (NODE)))
4404
4405 #define BASES_DIRECT(NODE) \
4406   TREE_LANG_FLAG_0 (BASES_CHECK (NODE))
4407
4408 /* The expression in question for a DECLTYPE_TYPE.  */
4409 #define DECLTYPE_TYPE_EXPR(NODE) (TYPE_VALUES_RAW (DECLTYPE_TYPE_CHECK (NODE)))
4410
4411 /* Whether the DECLTYPE_TYPE_EXPR of NODE was originally parsed as an
4412    id-expression or a member-access expression. When false, it was
4413    parsed as a full expression.  */
4414 #define DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P(NODE) \
4415   (DECLTYPE_TYPE_CHECK (NODE))->type_common.string_flag
4416
4417 /* These flags indicate that we want different semantics from normal
4418    decltype: lambda capture just drops references, init capture
4419    uses auto semantics, lambda proxies look through implicit dereference.  */
4420 #define DECLTYPE_FOR_LAMBDA_CAPTURE(NODE) \
4421   TREE_LANG_FLAG_0 (DECLTYPE_TYPE_CHECK (NODE))
4422 #define DECLTYPE_FOR_INIT_CAPTURE(NODE) \
4423   TREE_LANG_FLAG_1 (DECLTYPE_TYPE_CHECK (NODE))
4424 #define DECLTYPE_FOR_LAMBDA_PROXY(NODE) \
4425   TREE_LANG_FLAG_2 (DECLTYPE_TYPE_CHECK (NODE))
4426 #define DECLTYPE_FOR_REF_CAPTURE(NODE) \
4427   TREE_LANG_FLAG_3 (DECLTYPE_TYPE_CHECK (NODE))
4428
4429 /* Nonzero for VAR_DECL and FUNCTION_DECL node means that `extern' was
4430    specified in its declaration.  This can also be set for an
4431    erroneously declared PARM_DECL.  */
4432 #define DECL_THIS_EXTERN(NODE) \
4433   DECL_LANG_FLAG_2 (VAR_FUNCTION_OR_PARM_DECL_CHECK (NODE))
4434
4435 /* Nonzero for VAR_DECL and FUNCTION_DECL node means that `static' was
4436    specified in its declaration.  This can also be set for an
4437    erroneously declared PARM_DECL.  */
4438 #define DECL_THIS_STATIC(NODE) \
4439   DECL_LANG_FLAG_6 (VAR_FUNCTION_OR_PARM_DECL_CHECK (NODE))
4440
4441 /* Nonzero for FIELD_DECL node means that this field is a lambda capture
4442    field for an array of runtime bound.  */
4443 #define DECL_VLA_CAPTURE_P(NODE) \
4444   DECL_LANG_FLAG_1 (FIELD_DECL_CHECK (NODE))
4445
4446 /* Nonzero for PARM_DECL node means that this is an array function
4447    parameter, i.e, a[] rather than *a.  */
4448 #define DECL_ARRAY_PARAMETER_P(NODE) \
4449   DECL_LANG_FLAG_1 (PARM_DECL_CHECK (NODE))
4450
4451 /* Nonzero for a FIELD_DECL who's NSMDI is currently being
4452    instantiated.  */
4453 #define DECL_INSTANTIATING_NSDMI_P(NODE) \
4454   DECL_LANG_FLAG_2 (FIELD_DECL_CHECK (NODE))
4455
4456 /* Nonzero for FIELD_DECL node means that this field is a base class
4457    of the parent object, as opposed to a member field.  */
4458 #define DECL_FIELD_IS_BASE(NODE) \
4459   DECL_LANG_FLAG_6 (FIELD_DECL_CHECK (NODE))
4460
4461 /* Nonzero for FIELD_DECL node means that this field is a simple (no
4462    explicit initializer) lambda capture field, making it invisible to
4463    name lookup in unevaluated contexts.  */
4464 #define DECL_NORMAL_CAPTURE_P(NODE) \
4465   DECL_LANG_FLAG_7 (FIELD_DECL_CHECK (NODE))
4466
4467 /* Nonzero if TYPE is an anonymous union or struct type.  We have to use a
4468    flag for this because "A union for which objects or pointers are
4469    declared is not an anonymous union" [class.union].  */
4470 #define ANON_AGGR_TYPE_P(NODE)                          \
4471   (CLASS_TYPE_P (NODE) && LANG_TYPE_CLASS_CHECK (NODE)->anon_aggr)
4472 #define SET_ANON_AGGR_TYPE_P(NODE)                      \
4473   (LANG_TYPE_CLASS_CHECK (NODE)->anon_aggr = 1)
4474
4475 /* Nonzero if TYPE is an anonymous union type.  */
4476 #define ANON_UNION_TYPE_P(NODE) \
4477   (TREE_CODE (NODE) == UNION_TYPE && ANON_AGGR_TYPE_P (NODE))
4478
4479 /* Define fields and accessors for nodes representing declared names.  */
4480
4481 /* Nonzero if TYPE is an unnamed class with a typedef for linkage purposes.  */
4482 #define TYPE_WAS_UNNAMED(NODE) (LANG_TYPE_CLASS_CHECK (NODE)->was_anonymous)
4483
4484 /* C++: all of these are overloaded!  These apply only to TYPE_DECLs.  */
4485
4486 /* The format of each node in the DECL_FRIENDLIST is as follows:
4487
4488    The TREE_PURPOSE will be the name of a function, i.e., an
4489    IDENTIFIER_NODE.  The TREE_VALUE will be itself a TREE_LIST, whose
4490    TREE_VALUEs are friends with the given name.  */
4491 #define DECL_FRIENDLIST(NODE)           (DECL_INITIAL (NODE))
4492 #define FRIEND_NAME(LIST) (TREE_PURPOSE (LIST))
4493 #define FRIEND_DECLS(LIST) (TREE_VALUE (LIST))
4494
4495 /* The DECL_ACCESS, if non-NULL, is a TREE_LIST.  The TREE_PURPOSE of
4496    each node is a type; the TREE_VALUE is the access granted for this
4497    DECL in that type.  The DECL_ACCESS is set by access declarations.
4498    For example, if a member that would normally be public in a
4499    derived class is made protected, then the derived class and the
4500    protected_access_node will appear in the DECL_ACCESS for the node.  */
4501 #define DECL_ACCESS(NODE) (LANG_DECL_U2_CHECK (NODE, 0)->access)
4502
4503 /* Nonzero if the FUNCTION_DECL is a global constructor.  */
4504 #define DECL_GLOBAL_CTOR_P(NODE) \
4505   (LANG_DECL_FN_CHECK (NODE)->global_ctor_p)
4506
4507 /* Nonzero if the FUNCTION_DECL is a global destructor.  */
4508 #define DECL_GLOBAL_DTOR_P(NODE) \
4509   (LANG_DECL_FN_CHECK (NODE)->global_dtor_p)
4510
4511 /* Accessor macros for C++ template decl nodes.  */
4512
4513 /* The DECL_TEMPLATE_PARMS are a list.  The TREE_PURPOSE of each node
4514    is a INT_CST whose TREE_INT_CST_LOW indicates the level of the
4515    template parameters, with 1 being the outermost set of template
4516    parameters.  The TREE_VALUE is a vector, whose elements are the
4517    template parameters at each level.  Each element in the vector is a
4518    TREE_LIST, whose TREE_VALUE is a PARM_DECL (if the parameter is a
4519    non-type parameter), or a TYPE_DECL (if the parameter is a type
4520    parameter).  The TREE_PURPOSE is the default value, if any.  The
4521    TEMPLATE_PARM_INDEX for the parameter is available as the
4522    DECL_INITIAL (for a PARM_DECL) or as the TREE_TYPE (for a
4523    TYPE_DECL).
4524
4525    FIXME: CONST_CAST_TREE is a hack that hopefully will go away after
4526    tree is converted to C++ class hiearchy.  */
4527 #define DECL_TEMPLATE_PARMS(NODE)       \
4528    ((struct tree_template_decl *)CONST_CAST_TREE (TEMPLATE_DECL_CHECK (NODE)))->arguments
4529 #define DECL_INNERMOST_TEMPLATE_PARMS(NODE) \
4530    INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (NODE))
4531 #define DECL_NTPARMS(NODE) \
4532    TREE_VEC_LENGTH (DECL_INNERMOST_TEMPLATE_PARMS (NODE))
4533 /* For function, method, class-data templates.
4534
4535    FIXME: CONST_CAST_TREE is a hack that hopefully will go away after
4536    tree is converted to C++ class hiearchy.  */
4537 #define DECL_TEMPLATE_RESULT(NODE)      \
4538    ((struct tree_template_decl *)CONST_CAST_TREE(TEMPLATE_DECL_CHECK (NODE)))->result
4539 /* For a function template at namespace scope, DECL_TEMPLATE_INSTANTIATIONS
4540    lists all instantiations and specializations of the function so that
4541    tsubst_friend_function can reassign them to another template if we find
4542    that the namespace-scope template is really a partial instantiation of a
4543    friend template.
4544
4545    For a class template the DECL_TEMPLATE_INSTANTIATIONS lists holds
4546    all instantiations and specializations of the class type, including
4547    partial instantiations and partial specializations, so that if we
4548    explicitly specialize a partial instantiation we can walk the list
4549    in maybe_process_partial_specialization and reassign them or complain
4550    as appropriate.
4551
4552    In both cases, the TREE_PURPOSE of each node contains the arguments
4553    used; the TREE_VALUE contains the generated variable.  The template
4554    arguments are always complete.  For example, given:
4555
4556       template <class T> struct S1 {
4557         template <class U> struct S2 {};
4558         template <class U> struct S2<U*> {};
4559       };
4560
4561    the record for the partial specialization will contain, as its
4562    argument list, { {T}, {U*} }, and will be on the
4563    DECL_TEMPLATE_INSTANTIATIONS list for `template <class T> template
4564    <class U> struct S1<T>::S2'.
4565
4566    This list is not used for other templates.  */
4567 #define DECL_TEMPLATE_INSTANTIATIONS(NODE) \
4568   DECL_SIZE_UNIT (TEMPLATE_DECL_CHECK (NODE))
4569
4570 /* For a class template, this list contains the partial
4571    specializations of this template.  (Full specializations are not
4572    recorded on this list.)  The TREE_PURPOSE holds the arguments used
4573    in the partial specialization (e.g., for `template <class T> struct
4574    S<T*, int>' this will be `T*, int'.)  The arguments will also include
4575    any outer template arguments.  The TREE_VALUE holds the TEMPLATE_DECL
4576    for the partial specialization.  The TREE_TYPE is the _TYPE node for
4577    the partial specialization.
4578
4579    This list is not used for other templates.  */
4580 #define DECL_TEMPLATE_SPECIALIZATIONS(NODE)     \
4581   DECL_SIZE (TEMPLATE_DECL_CHECK (NODE))
4582
4583 /* Nonzero for a DECL which is actually a template parameter.  Keep
4584    these checks in ascending tree code order.   */
4585 #define DECL_TEMPLATE_PARM_P(NODE)              \
4586   (DECL_LANG_FLAG_0 (NODE)                      \
4587    && (TREE_CODE (NODE) == CONST_DECL           \
4588        || TREE_CODE (NODE) == PARM_DECL         \
4589        || TREE_CODE (NODE) == TYPE_DECL         \
4590        || TREE_CODE (NODE) == TEMPLATE_DECL))
4591
4592 /* Nonzero for a raw template parameter node.  */
4593 #define TEMPLATE_PARM_P(NODE)                                   \
4594   (TREE_CODE (NODE) == TEMPLATE_TYPE_PARM                       \
4595    || TREE_CODE (NODE) == TEMPLATE_TEMPLATE_PARM                \
4596    || TREE_CODE (NODE) == TEMPLATE_PARM_INDEX)
4597
4598 /* Mark NODE as a template parameter.  */
4599 #define SET_DECL_TEMPLATE_PARM_P(NODE) \
4600   (DECL_LANG_FLAG_0 (NODE) = 1)
4601
4602 /* Nonzero if NODE is a template template parameter.  */
4603 #define DECL_TEMPLATE_TEMPLATE_PARM_P(NODE) \
4604   (TREE_CODE (NODE) == TEMPLATE_DECL && DECL_TEMPLATE_PARM_P (NODE))
4605
4606 /* Nonzero for a DECL that represents a function template.  */
4607 #define DECL_FUNCTION_TEMPLATE_P(NODE)                          \
4608   (TREE_CODE (NODE) == TEMPLATE_DECL                            \
4609    && DECL_TEMPLATE_RESULT (NODE) != NULL_TREE                  \
4610    && TREE_CODE (DECL_TEMPLATE_RESULT (NODE)) == FUNCTION_DECL)
4611
4612 /* Nonzero for a DECL that represents a class template or alias
4613    template.  */
4614 #define DECL_TYPE_TEMPLATE_P(NODE)                              \
4615   (TREE_CODE (NODE) == TEMPLATE_DECL                            \
4616    && DECL_TEMPLATE_RESULT (NODE) != NULL_TREE                  \
4617    && TREE_CODE (DECL_TEMPLATE_RESULT (NODE)) == TYPE_DECL)
4618
4619 /* Nonzero for a DECL that represents a class template.  */
4620 #define DECL_CLASS_TEMPLATE_P(NODE)                             \
4621   (DECL_TYPE_TEMPLATE_P (NODE)                                  \
4622    && DECL_IMPLICIT_TYPEDEF_P (DECL_TEMPLATE_RESULT (NODE)))
4623
4624 /* Nonzero for a TEMPLATE_DECL that represents an alias template.  */
4625 #define DECL_ALIAS_TEMPLATE_P(NODE)                     \
4626   (DECL_TYPE_TEMPLATE_P (NODE)                          \
4627    && !DECL_ARTIFICIAL (DECL_TEMPLATE_RESULT (NODE)))
4628
4629 /* Nonzero for a NODE which declares a type.  */
4630 #define DECL_DECLARES_TYPE_P(NODE) \
4631   (TREE_CODE (NODE) == TYPE_DECL || DECL_TYPE_TEMPLATE_P (NODE))
4632
4633 /* Nonzero if NODE declares a function.  */
4634 #define DECL_DECLARES_FUNCTION_P(NODE) \
4635   (TREE_CODE (NODE) == FUNCTION_DECL || DECL_FUNCTION_TEMPLATE_P (NODE))
4636
4637 /* Nonzero if NODE is the typedef implicitly generated for a type when
4638    the type is declared.  In C++, `struct S {};' is roughly
4639    equivalent to `struct S {}; typedef struct S S;' in C.
4640    DECL_IMPLICIT_TYPEDEF_P will hold for the typedef indicated in this
4641    example.  In C++, there is a second implicit typedef for each
4642    class, called the injected-class-name, in the scope of `S' itself, so that
4643    you can say `S::S'.  DECL_SELF_REFERENCE_P will hold for that typedef.  */
4644 #define DECL_IMPLICIT_TYPEDEF_P(NODE) \
4645   (TREE_CODE (NODE) == TYPE_DECL && DECL_LANG_FLAG_2 (NODE))
4646 #define SET_DECL_IMPLICIT_TYPEDEF_P(NODE) \
4647   (DECL_LANG_FLAG_2 (NODE) = 1)
4648 #define DECL_SELF_REFERENCE_P(NODE) \
4649   (TREE_CODE (NODE) == TYPE_DECL && DECL_LANG_FLAG_4 (NODE))
4650 #define SET_DECL_SELF_REFERENCE_P(NODE) \
4651   (DECL_LANG_FLAG_4 (NODE) = 1)
4652
4653 /* A `primary' template is one that has its own template header and is not
4654    a partial specialization.  A member function of a class template is a
4655    template, but not primary.  A member template is primary.  Friend
4656    templates are primary, too.  */
4657
4658 /* Returns the primary template corresponding to these parameters.  */
4659 #define DECL_PRIMARY_TEMPLATE(NODE) \
4660   (TREE_TYPE (DECL_INNERMOST_TEMPLATE_PARMS (NODE)))
4661
4662 /* Returns nonzero if NODE is a primary template.  */
4663 #define PRIMARY_TEMPLATE_P(NODE) (DECL_PRIMARY_TEMPLATE (NODE) == (NODE))
4664
4665 /* Nonzero iff NODE is a specialization of a template.  The value
4666    indicates the type of specializations:
4667
4668      1=implicit instantiation
4669
4670      2=partial or explicit specialization, e.g.:
4671
4672         template <> int min<int> (int, int),
4673
4674      3=explicit instantiation, e.g.:
4675
4676         template int min<int> (int, int);
4677
4678    Note that NODE will be marked as a specialization even if the
4679    template it is instantiating is not a primary template.  For
4680    example, given:
4681
4682      template <typename T> struct O {
4683        void f();
4684        struct I {};
4685      };
4686
4687    both O<int>::f and O<int>::I will be marked as instantiations.
4688
4689    If DECL_USE_TEMPLATE is nonzero, then DECL_TEMPLATE_INFO will also
4690    be non-NULL.  */
4691 #define DECL_USE_TEMPLATE(NODE) (DECL_LANG_SPECIFIC (NODE)->u.base.use_template)
4692
4693 /* Like DECL_USE_TEMPLATE, but for class types.  */
4694 #define CLASSTYPE_USE_TEMPLATE(NODE) \
4695   (LANG_TYPE_CLASS_CHECK (NODE)->use_template)
4696
4697 /* True if NODE is a specialization of a primary template.  */
4698 #define CLASSTYPE_SPECIALIZATION_OF_PRIMARY_TEMPLATE_P(NODE)    \
4699   (CLASS_TYPE_P (NODE)                                          \
4700    && CLASSTYPE_USE_TEMPLATE (NODE)                             \
4701    && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (NODE)))
4702
4703 #define DECL_TEMPLATE_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) & 1)
4704 #define CLASSTYPE_TEMPLATE_INSTANTIATION(NODE) \
4705   (CLASSTYPE_USE_TEMPLATE (NODE) & 1)
4706
4707 #define DECL_TEMPLATE_SPECIALIZATION(NODE) (DECL_USE_TEMPLATE (NODE) == 2)
4708 #define SET_DECL_TEMPLATE_SPECIALIZATION(NODE) (DECL_USE_TEMPLATE (NODE) = 2)
4709
4710 /* Returns true for an explicit or partial specialization of a class
4711    template.  */
4712 #define CLASSTYPE_TEMPLATE_SPECIALIZATION(NODE) \
4713   (CLASSTYPE_USE_TEMPLATE (NODE) == 2)
4714 #define SET_CLASSTYPE_TEMPLATE_SPECIALIZATION(NODE) \
4715   (CLASSTYPE_USE_TEMPLATE (NODE) = 2)
4716
4717 #define DECL_IMPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) == 1)
4718 #define SET_DECL_IMPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) = 1)
4719 #define CLASSTYPE_IMPLICIT_INSTANTIATION(NODE) \
4720   (CLASSTYPE_USE_TEMPLATE (NODE) == 1)
4721 #define SET_CLASSTYPE_IMPLICIT_INSTANTIATION(NODE) \
4722   (CLASSTYPE_USE_TEMPLATE (NODE) = 1)
4723
4724 #define DECL_EXPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) == 3)
4725 #define SET_DECL_EXPLICIT_INSTANTIATION(NODE) (DECL_USE_TEMPLATE (NODE) = 3)
4726 #define CLASSTYPE_EXPLICIT_INSTANTIATION(NODE) \
4727   (CLASSTYPE_USE_TEMPLATE (NODE) == 3)
4728 #define SET_CLASSTYPE_EXPLICIT_INSTANTIATION(NODE) \
4729   (CLASSTYPE_USE_TEMPLATE (NODE) = 3)
4730
4731 /* Nonzero if DECL is a friend function which is an instantiation
4732    from the point of view of the compiler, but not from the point of
4733    view of the language.  For example given:
4734       template <class T> struct S { friend void f(T) {}; };
4735    the declaration of `void f(int)' generated when S<int> is
4736    instantiated will not be a DECL_TEMPLATE_INSTANTIATION, but will be
4737    a DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION.  */
4738 #define DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION(DECL) \
4739   (DECL_LANG_SPECIFIC (DECL) && DECL_TEMPLATE_INFO (DECL) \
4740    && !DECL_USE_TEMPLATE (DECL))
4741
4742 /* Nonzero if DECL is a function generated from a function 'temploid',
4743    i.e. template, member of class template, or dependent friend.  */
4744 #define DECL_TEMPLOID_INSTANTIATION(DECL)               \
4745   (DECL_TEMPLATE_INSTANTIATION (DECL)                   \
4746    || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (DECL))
4747
4748 /* Nonzero if DECL is either defined implicitly by the compiler or
4749    generated from a temploid.  */
4750 #define DECL_GENERATED_P(DECL) \
4751   (DECL_TEMPLOID_INSTANTIATION (DECL) || DECL_DEFAULTED_FN (DECL))
4752
4753 /* Nonzero iff we are currently processing a declaration for an
4754    entity with its own template parameter list, and which is not a
4755    full specialization.  */
4756 #define PROCESSING_REAL_TEMPLATE_DECL_P() \
4757   (!processing_template_parmlist \
4758    && processing_template_decl > template_class_depth (current_scope ()))
4759
4760 /* Nonzero if this VAR_DECL or FUNCTION_DECL has already been
4761    instantiated, i.e. its definition has been generated from the
4762    pattern given in the template.  */
4763 #define DECL_TEMPLATE_INSTANTIATED(NODE) \
4764   DECL_LANG_FLAG_1 (VAR_OR_FUNCTION_DECL_CHECK (NODE))
4765
4766 /* We know what we're doing with this decl now.  */
4767 #define DECL_INTERFACE_KNOWN(NODE) DECL_LANG_FLAG_5 (NODE)
4768
4769 /* DECL_EXTERNAL must be set on a decl until the decl is actually emitted,
4770    so that assemble_external will work properly.  So we have this flag to
4771    tell us whether the decl is really not external.
4772
4773    This flag does not indicate whether or not the decl is defined in the
4774    current translation unit; it indicates whether or not we should emit the
4775    decl at the end of compilation if it is defined and needed.  */
4776 #define DECL_NOT_REALLY_EXTERN(NODE) \
4777   (DECL_LANG_SPECIFIC (NODE)->u.base.not_really_extern)
4778
4779 #define DECL_REALLY_EXTERN(NODE) \
4780   (DECL_EXTERNAL (NODE)                         \
4781    && (!DECL_LANG_SPECIFIC (NODE) || !DECL_NOT_REALLY_EXTERN (NODE)))
4782
4783 /* A thunk is a stub function.
4784
4785    A thunk is an alternate entry point for an ordinary FUNCTION_DECL.
4786    The address of the ordinary FUNCTION_DECL is given by the
4787    DECL_INITIAL, which is always an ADDR_EXPR whose operand is a
4788    FUNCTION_DECL.  The job of the thunk is to either adjust the this
4789    pointer before transferring control to the FUNCTION_DECL, or call
4790    FUNCTION_DECL and then adjust the result value. Note, the result
4791    pointer adjusting thunk must perform a call to the thunked
4792    function, (or be implemented via passing some invisible parameter
4793    to the thunked function, which is modified to perform the
4794    adjustment just before returning).
4795
4796    A thunk may perform either, or both, of the following operations:
4797
4798    o Adjust the this or result pointer by a constant offset.
4799    o Adjust the this or result pointer by looking up a vcall or vbase offset
4800      in the vtable.
4801
4802    A this pointer adjusting thunk converts from a base to a derived
4803    class, and hence adds the offsets. A result pointer adjusting thunk
4804    converts from a derived class to a base, and hence subtracts the
4805    offsets.  If both operations are performed, then the constant
4806    adjustment is performed first for this pointer adjustment and last
4807    for the result pointer adjustment.
4808
4809    The constant adjustment is given by THUNK_FIXED_OFFSET.  If the
4810    vcall or vbase offset is required, THUNK_VIRTUAL_OFFSET is
4811    used. For this pointer adjusting thunks, it is the vcall offset
4812    into the vtable.  For result pointer adjusting thunks it is the
4813    binfo of the virtual base to convert to.  Use that binfo's vbase
4814    offset.
4815
4816    It is possible to have equivalent covariant thunks.  These are
4817    distinct virtual covariant thunks whose vbase offsets happen to
4818    have the same value.  THUNK_ALIAS is used to pick one as the
4819    canonical thunk, which will get all the this pointer adjusting
4820    thunks attached to it.  */
4821
4822 /* An integer indicating how many bytes should be subtracted from the
4823    this or result pointer when this function is called.  */
4824 #define THUNK_FIXED_OFFSET(DECL) \
4825   (DECL_LANG_SPECIFIC (THUNK_FUNCTION_CHECK (DECL))->u.fn.u5.fixed_offset)
4826
4827 /* A tree indicating how to perform the virtual adjustment. For a this
4828    adjusting thunk it is the number of bytes to be added to the vtable
4829    to find the vcall offset. For a result adjusting thunk, it is the
4830    binfo of the relevant virtual base.  If NULL, then there is no
4831    virtual adjust.  (The vptr is always located at offset zero from
4832    the this or result pointer.)  (If the covariant type is within the
4833    class hierarchy being laid out, the vbase index is not yet known
4834    at the point we need to create the thunks, hence the need to use
4835    binfos.)  */
4836
4837 #define THUNK_VIRTUAL_OFFSET(DECL) \
4838   (LANG_DECL_U2_CHECK (FUNCTION_DECL_CHECK (DECL), 0)->access)
4839
4840 /* A thunk which is equivalent to another thunk.  */
4841 #define THUNK_ALIAS(DECL) \
4842   (DECL_LANG_SPECIFIC (FUNCTION_DECL_CHECK (DECL))->u.min.template_info)
4843
4844 /* For thunk NODE, this is the FUNCTION_DECL thunked to.  It is
4845    possible for the target to be a thunk too.  */
4846 #define THUNK_TARGET(NODE)                              \
4847   (LANG_DECL_FN_CHECK (NODE)->befriending_classes)
4848
4849 /* True for a SCOPE_REF iff the "template" keyword was used to
4850    indicate that the qualified name denotes a template.  */
4851 #define QUALIFIED_NAME_IS_TEMPLATE(NODE) \
4852   (TREE_LANG_FLAG_1 (SCOPE_REF_CHECK (NODE)))
4853
4854 /* True for an OMP_ATOMIC that has dependent parameters.  These are stored
4855    as an expr in operand 1, and integer_zero_node in operand 0.  */
4856 #define OMP_ATOMIC_DEPENDENT_P(NODE) \
4857   (TREE_CODE (TREE_OPERAND (OMP_ATOMIC_CHECK (NODE), 0)) == INTEGER_CST)
4858
4859 /* Used while gimplifying continue statements bound to OMP_FOR nodes.  */
4860 #define OMP_FOR_GIMPLIFYING_P(NODE) \
4861   (TREE_LANG_FLAG_0 (OMP_LOOP_CHECK (NODE)))
4862
4863 /* A language-specific token attached to the OpenMP data clauses to
4864    hold code (or code fragments) related to ctors, dtors, and op=.
4865    See semantics.c for details.  */
4866 #define CP_OMP_CLAUSE_INFO(NODE) \
4867   TREE_TYPE (OMP_CLAUSE_RANGE_CHECK (NODE, OMP_CLAUSE_PRIVATE, \
4868                                      OMP_CLAUSE_LINEAR))
4869
4870 /* Nonzero if this transaction expression's body contains statements.  */
4871 #define TRANSACTION_EXPR_IS_STMT(NODE) \
4872    TREE_LANG_FLAG_0 (TRANSACTION_EXPR_CHECK (NODE))
4873
4874 /* These macros provide convenient access to the various _STMT nodes
4875    created when parsing template declarations.  */
4876 #define TRY_STMTS(NODE)         TREE_OPERAND (TRY_BLOCK_CHECK (NODE), 0)
4877 #define TRY_HANDLERS(NODE)      TREE_OPERAND (TRY_BLOCK_CHECK (NODE), 1)
4878
4879 #define EH_SPEC_STMTS(NODE)     TREE_OPERAND (EH_SPEC_BLOCK_CHECK (NODE), 0)
4880 #define EH_SPEC_RAISES(NODE)    TREE_OPERAND (EH_SPEC_BLOCK_CHECK (NODE), 1)
4881
4882 #define USING_STMT_NAMESPACE(NODE) TREE_OPERAND (USING_STMT_CHECK (NODE), 0)
4883
4884 /* Nonzero if this try block is a function try block.  */
4885 #define FN_TRY_BLOCK_P(NODE)    TREE_LANG_FLAG_3 (TRY_BLOCK_CHECK (NODE))
4886 #define HANDLER_PARMS(NODE)     TREE_OPERAND (HANDLER_CHECK (NODE), 0)
4887 #define HANDLER_BODY(NODE)      TREE_OPERAND (HANDLER_CHECK (NODE), 1)
4888 #define HANDLER_TYPE(NODE)      TREE_TYPE (HANDLER_CHECK (NODE))
4889
4890 /* CLEANUP_STMT accessors.  The statement(s) covered, the cleanup to run
4891    and the VAR_DECL for which this cleanup exists.  */
4892 #define CLEANUP_BODY(NODE)      TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
4893 #define CLEANUP_EXPR(NODE)      TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
4894 #define CLEANUP_DECL(NODE)      TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 2)
4895
4896 /* IF_STMT accessors. These give access to the condition of the if
4897    statement, the then block of the if statement, and the else block
4898    of the if statement if it exists.  */
4899 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
4900 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
4901 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
4902 #define IF_SCOPE(NODE)          TREE_OPERAND (IF_STMT_CHECK (NODE), 3)
4903 #define IF_STMT_CONSTEXPR_P(NODE) TREE_LANG_FLAG_0 (IF_STMT_CHECK (NODE))
4904
4905 /* Like PACK_EXPANSION_EXTRA_ARGS, for constexpr if.  IF_SCOPE is used while
4906    building an IF_STMT; IF_STMT_EXTRA_ARGS is used after it is complete.  */
4907 #define IF_STMT_EXTRA_ARGS(NODE) IF_SCOPE (NODE)
4908
4909 /* WHILE_STMT accessors. These give access to the condition of the
4910    while statement and the body of the while statement, respectively.  */
4911 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
4912 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
4913
4914 /* DO_STMT accessors. These give access to the condition of the do
4915    statement and the body of the do statement, respectively.  */
4916 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
4917 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
4918
4919 /* FOR_STMT accessors. These give access to the init statement,
4920    condition, update expression, and body of the for statement,
4921    respectively.  */
4922 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
4923 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
4924 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
4925 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
4926 #define FOR_SCOPE(NODE)         TREE_OPERAND (FOR_STMT_CHECK (NODE), 4)
4927
4928 /* RANGE_FOR_STMT accessors. These give access to the declarator,
4929    expression, body, and scope of the statement, respectively.  */
4930 #define RANGE_FOR_DECL(NODE)    TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 0)
4931 #define RANGE_FOR_EXPR(NODE)    TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 1)
4932 #define RANGE_FOR_BODY(NODE)    TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 2)
4933 #define RANGE_FOR_SCOPE(NODE)   TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 3)
4934 #define RANGE_FOR_UNROLL(NODE)  TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 4)
4935 #define RANGE_FOR_INIT_STMT(NODE) TREE_OPERAND (RANGE_FOR_STMT_CHECK (NODE), 5)
4936 #define RANGE_FOR_IVDEP(NODE)   TREE_LANG_FLAG_6 (RANGE_FOR_STMT_CHECK (NODE))
4937
4938 #define SWITCH_STMT_COND(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
4939 #define SWITCH_STMT_BODY(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
4940 #define SWITCH_STMT_TYPE(NODE)  TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
4941 #define SWITCH_STMT_SCOPE(NODE) TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 3)
4942 /* True if there are case labels for all possible values of switch cond, either
4943    because there is a default: case label or because the case label ranges cover
4944    all values.  */
4945 #define SWITCH_STMT_ALL_CASES_P(NODE) \
4946   TREE_LANG_FLAG_0 (SWITCH_STMT_CHECK (NODE))
4947 /* True if the body of a switch stmt contains no BREAK_STMTs.  */
4948 #define SWITCH_STMT_NO_BREAK_P(NODE) \
4949   TREE_LANG_FLAG_2 (SWITCH_STMT_CHECK (NODE))
4950
4951 /* STMT_EXPR accessor.  */
4952 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
4953
4954 /* EXPR_STMT accessor. This gives the expression associated with an
4955    expression statement.  */
4956 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
4957
4958 /* True if this TARGET_EXPR was created by build_cplus_new, and so we can
4959    discard it if it isn't useful.  */
4960 #define TARGET_EXPR_IMPLICIT_P(NODE) \
4961   TREE_LANG_FLAG_0 (TARGET_EXPR_CHECK (NODE))
4962
4963 /* True if this TARGET_EXPR is the result of list-initialization of a
4964    temporary.  */
4965 #define TARGET_EXPR_LIST_INIT_P(NODE) \
4966   TREE_LANG_FLAG_1 (TARGET_EXPR_CHECK (NODE))
4967
4968 /* True if this TARGET_EXPR expresses direct-initialization of an object
4969    to be named later.  */
4970 #define TARGET_EXPR_DIRECT_INIT_P(NODE) \
4971   TREE_LANG_FLAG_2 (TARGET_EXPR_CHECK (NODE))
4972
4973 /* True if NODE is a TARGET_EXPR that just expresses a copy of its INITIAL; if
4974    the initializer has void type, it's doing something more complicated.  */
4975 #define SIMPLE_TARGET_EXPR_P(NODE)                              \
4976   (TREE_CODE (NODE) == TARGET_EXPR                              \
4977    && !VOID_TYPE_P (TREE_TYPE (TARGET_EXPR_INITIAL (NODE))))
4978
4979 /* True if EXPR expresses direct-initialization of a TYPE.  */
4980 #define DIRECT_INIT_EXPR_P(TYPE,EXPR)                                   \
4981   (TREE_CODE (EXPR) == TARGET_EXPR && TREE_LANG_FLAG_2 (EXPR)           \
4982    && same_type_ignoring_top_level_qualifiers_p (TYPE, TREE_TYPE (EXPR)))
4983
4984 /* True if this CONVERT_EXPR is for a conversion to virtual base in
4985    an NSDMI, and should be re-evaluated when used in a constructor.  */
4986 #define CONVERT_EXPR_VBASE_PATH(NODE) \
4987   TREE_LANG_FLAG_0 (CONVERT_EXPR_CHECK (NODE))
4988
4989 /* True if SIZEOF_EXPR argument is type.  */
4990 #define SIZEOF_EXPR_TYPE_P(NODE) \
4991   TREE_LANG_FLAG_0 (SIZEOF_EXPR_CHECK (NODE))
4992
4993 /* True if the ALIGNOF_EXPR was spelled "alignof".  */
4994 #define ALIGNOF_EXPR_STD_P(NODE) \
4995   TREE_LANG_FLAG_0 (ALIGNOF_EXPR_CHECK (NODE))
4996
4997 /* An enumeration of the kind of tags that C++ accepts.  */
4998 enum tag_types {
4999   none_type = 0, /* Not a tag type.  */
5000   record_type,   /* "struct" types.  */
5001   class_type,    /* "class" types.  */
5002   union_type,    /* "union" types.  */
5003   enum_type,     /* "enum" types.  */
5004   typename_type, /* "typename" types.  */
5005   scope_type     /* namespace or tagged type name followed by :: */
5006 };
5007
5008 /* The various kinds of lvalues we distinguish.  */
5009 enum cp_lvalue_kind_flags {
5010   clk_none = 0,     /* Things that are not an lvalue.  */
5011   clk_ordinary = 1, /* An ordinary lvalue.  */
5012   clk_rvalueref = 2,/* An xvalue (rvalue formed using an rvalue reference) */
5013   clk_class = 4,    /* A prvalue of class or array type.  */
5014   clk_bitfield = 8, /* An lvalue for a bit-field.  */
5015   clk_packed = 16   /* An lvalue for a packed field.  */
5016 };
5017
5018 /* This type is used for parameters and variables which hold
5019    combinations of the flags in enum cp_lvalue_kind_flags.  */
5020 typedef int cp_lvalue_kind;
5021
5022 /* Various kinds of template specialization, instantiation, etc.  */
5023 enum tmpl_spec_kind {
5024   tsk_none,                /* Not a template at all.  */
5025   tsk_invalid_member_spec, /* An explicit member template
5026                               specialization, but the enclosing
5027                               classes have not all been explicitly
5028                               specialized.  */
5029   tsk_invalid_expl_inst,   /* An explicit instantiation containing
5030                               template parameter lists.  */
5031   tsk_excessive_parms,     /* A template declaration with too many
5032                               template parameter lists.  */
5033   tsk_insufficient_parms,  /* A template declaration with too few
5034                               parameter lists.  */
5035   tsk_template,            /* A template declaration.  */
5036   tsk_expl_spec,           /* An explicit specialization.  */
5037   tsk_expl_inst            /* An explicit instantiation.  */
5038 };
5039
5040 /* The various kinds of access.  BINFO_ACCESS depends on these being
5041    two bit quantities.  The numerical values are important; they are
5042    used to initialize RTTI data structures, so changing them changes
5043    the ABI.  */
5044 enum access_kind {
5045   ak_none = 0,             /* Inaccessible.  */
5046   ak_public = 1,           /* Accessible, as a `public' thing.  */
5047   ak_protected = 2,        /* Accessible, as a `protected' thing.  */
5048   ak_private = 3           /* Accessible, as a `private' thing.  */
5049 };
5050
5051 /* The various kinds of special functions.  If you add to this list,
5052    you should update special_function_p as well.  */
5053 enum special_function_kind {
5054   sfk_none = 0,            /* Not a special function.  This enumeral
5055                               must have value zero; see
5056                               special_function_p.  */
5057   sfk_constructor,         /* A constructor.  */
5058   sfk_copy_constructor,    /* A copy constructor.  */
5059   sfk_move_constructor,    /* A move constructor.  */
5060   sfk_copy_assignment,     /* A copy assignment operator.  */
5061   sfk_move_assignment,     /* A move assignment operator.  */
5062   sfk_destructor,          /* A destructor.  */
5063   sfk_complete_destructor, /* A destructor for complete objects.  */
5064   sfk_base_destructor,     /* A destructor for base subobjects.  */
5065   sfk_deleting_destructor, /* A destructor for complete objects that
5066                               deletes the object after it has been
5067                               destroyed.  */
5068   sfk_conversion,          /* A conversion operator.  */
5069   sfk_deduction_guide,     /* A class template deduction guide.  */
5070   sfk_inheriting_constructor /* An inheriting constructor */
5071 };
5072
5073 /* The various kinds of linkage.  From [basic.link],
5074
5075       A name is said to have linkage when it might denote the same
5076       object, reference, function, type, template, namespace or value
5077       as a name introduced in another scope:
5078
5079       -- When a name has external linkage, the entity it denotes can
5080          be referred to from scopes of other translation units or from
5081          other scopes of the same translation unit.
5082
5083       -- When a name has internal linkage, the entity it denotes can
5084          be referred to by names from other scopes in the same
5085          translation unit.
5086
5087       -- When a name has no linkage, the entity it denotes cannot be
5088          referred to by names from other scopes.  */
5089
5090 enum linkage_kind {
5091   lk_none,                      /* No linkage.  */
5092   lk_internal,                  /* Internal linkage.  */
5093   lk_external                   /* External linkage.  */
5094 };
5095
5096 enum duration_kind {
5097   dk_static,
5098   dk_thread,
5099   dk_auto,
5100   dk_dynamic
5101 };
5102
5103 /* Bitmask flags to control type substitution.  */
5104 enum tsubst_flags {
5105   tf_none = 0,                   /* nothing special */
5106   tf_error = 1 << 0,             /* give error messages  */
5107   tf_warning = 1 << 1,           /* give warnings too  */
5108   tf_ignore_bad_quals = 1 << 2,  /* ignore bad cvr qualifiers */
5109   tf_keep_type_decl = 1 << 3,    /* retain typedef type decls
5110                                     (make_typename_type use) */
5111   tf_ptrmem_ok = 1 << 4,         /* pointers to member ok (internal
5112                                     instantiate_type use) */
5113   tf_user = 1 << 5,              /* found template must be a user template
5114                                     (lookup_template_class use) */
5115   tf_conv = 1 << 6,              /* We are determining what kind of
5116                                     conversion might be permissible,
5117                                     not actually performing the
5118                                     conversion.  */
5119   tf_decltype = 1 << 7,          /* We are the operand of decltype.
5120                                     Used to implement the special rules
5121                                     for calls in decltype (5.2.2/11).  */
5122   tf_partial = 1 << 8,           /* Doing initial explicit argument
5123                                     substitution in fn_type_unification.  */
5124   tf_fndecl_type = 1 << 9,   /* Substituting the type of a function
5125                                 declaration.  */
5126   tf_no_cleanup = 1 << 10,   /* Do not build a cleanup
5127                                 (build_target_expr and friends) */
5128   /* Convenient substitution flags combinations.  */
5129   tf_warning_or_error = tf_warning | tf_error
5130 };
5131
5132 /* This type is used for parameters and variables which hold
5133    combinations of the flags in enum tsubst_flags.  */
5134 typedef int tsubst_flags_t;
5135
5136 /* The kind of checking we can do looking in a class hierarchy.  */
5137 enum base_access_flags {
5138   ba_any = 0,  /* Do not check access, allow an ambiguous base,
5139                       prefer a non-virtual base */
5140   ba_unique = 1 << 0,  /* Must be a unique base.  */
5141   ba_check_bit = 1 << 1,   /* Check access.  */
5142   ba_check = ba_unique | ba_check_bit,
5143   ba_ignore_scope = 1 << 2 /* Ignore access allowed by local scope.  */
5144 };
5145
5146 /* This type is used for parameters and variables which hold
5147    combinations of the flags in enum base_access_flags.  */
5148 typedef int base_access;
5149
5150 /* The various kinds of access check during parsing.  */
5151 enum deferring_kind {
5152   dk_no_deferred = 0, /* Check access immediately */
5153   dk_deferred = 1,    /* Deferred check */
5154   dk_no_check = 2     /* No access check */
5155 };
5156
5157 /* The kind of base we can find, looking in a class hierarchy.
5158    Values <0 indicate we failed.  */
5159 enum base_kind {
5160   bk_inaccessible = -3,   /* The base is inaccessible */
5161   bk_ambig = -2,          /* The base is ambiguous */
5162   bk_not_base = -1,       /* It is not a base */
5163   bk_same_type = 0,       /* It is the same type */
5164   bk_proper_base = 1,     /* It is a proper base */
5165   bk_via_virtual = 2      /* It is a proper base, but via a virtual
5166                              path. This might not be the canonical
5167                              binfo.  */
5168 };
5169
5170 /* Node for "pointer to (virtual) function".
5171    This may be distinct from ptr_type_node so gdb can distinguish them.  */
5172 #define vfunc_ptr_type_node  vtable_entry_type
5173
5174
5175 /* For building calls to `delete'.  */
5176 extern GTY(()) tree integer_two_node;
5177
5178 /* The number of function bodies which we are currently processing.
5179    (Zero if we are at namespace scope, one inside the body of a
5180    function, two inside the body of a function in a local class, etc.)  */
5181 extern int function_depth;
5182
5183 /* Nonzero if we are inside eq_specializations, which affects comparison of
5184    PARM_DECLs in cp_tree_equal.  */
5185 extern int comparing_specializations;
5186
5187 /* In parser.c.  */
5188
5189 /* Nonzero if we are parsing an unevaluated operand: an operand to
5190    sizeof, typeof, or alignof.  This is a count since operands to
5191    sizeof can be nested.  */
5192
5193 extern int cp_unevaluated_operand;
5194
5195 /* RAII class used to inhibit the evaluation of operands during parsing
5196    and template instantiation. Evaluation warnings are also inhibited. */
5197
5198 struct cp_unevaluated
5199 {
5200   cp_unevaluated ();
5201   ~cp_unevaluated ();
5202 };
5203
5204 /* in pt.c  */
5205
5206 /* These values are used for the `STRICT' parameter to type_unification and
5207    fn_type_unification.  Their meanings are described with the
5208    documentation for fn_type_unification.  */
5209
5210 enum unification_kind_t {
5211   DEDUCE_CALL,
5212   DEDUCE_CONV,
5213   DEDUCE_EXACT
5214 };
5215
5216 // An RAII class used to create a new pointer map for local
5217 // specializations. When the stack goes out of scope, the
5218 // previous pointer map is restored.
5219 enum lss_policy { lss_blank, lss_copy };
5220 struct local_specialization_stack
5221 {
5222   local_specialization_stack (lss_policy = lss_blank);
5223   ~local_specialization_stack ();
5224
5225   hash_map<tree, tree> *saved;
5226 };
5227
5228 /* in class.c */
5229
5230 extern int current_class_depth;
5231
5232 /* An array of all local classes present in this translation unit, in
5233    declaration order.  */
5234 extern GTY(()) vec<tree, va_gc> *local_classes;
5235
5236 /* in decl.c */
5237
5238 /* An array of static vars & fns.  */
5239 extern GTY(()) vec<tree, va_gc> *static_decls;
5240
5241 /* An array of vtable-needing types that have no key function, or have
5242    an emitted key function.  */
5243 extern GTY(()) vec<tree, va_gc> *keyed_classes;
5244 \f
5245 /* Here's where we control how name mangling takes place.  */
5246
5247 /* Cannot use '$' up front, because this confuses gdb
5248    (names beginning with '$' are gdb-local identifiers).
5249
5250    Note that all forms in which the '$' is significant are long enough
5251    for direct indexing (meaning that if we know there is a '$'
5252    at a particular location, we can index into the string at
5253    any other location that provides distinguishing characters).  */
5254
5255 /* Define NO_DOT_IN_LABEL in your favorite tm file if your assembler
5256    doesn't allow '.' in symbol names.  */
5257 #ifndef NO_DOT_IN_LABEL
5258
5259 #define JOINER '.'
5260
5261 #define AUTO_TEMP_NAME "_.tmp_"
5262 #define VFIELD_BASE ".vf"
5263 #define VFIELD_NAME "_vptr."
5264 #define VFIELD_NAME_FORMAT "_vptr.%s"
5265
5266 #else /* NO_DOT_IN_LABEL */
5267
5268 #ifndef NO_DOLLAR_IN_LABEL
5269
5270 #define JOINER '$'
5271
5272 #define AUTO_TEMP_NAME "_$tmp_"
5273 #define VFIELD_BASE "$vf"
5274 #define VFIELD_NAME "_vptr$"
5275 #define VFIELD_NAME_FORMAT "_vptr$%s"
5276
5277 #else /* NO_DOLLAR_IN_LABEL */
5278
5279 #define VTABLE_NAME "__vt_"
5280 #define VTABLE_NAME_P(ID_NODE) \
5281   (!strncmp (IDENTIFIER_POINTER (ID_NODE), VTABLE_NAME, \
5282              sizeof (VTABLE_NAME) - 1))
5283 #define VFIELD_BASE "__vfb"
5284 #define VFIELD_NAME "__vptr_"
5285 #define VFIELD_NAME_P(ID_NODE) \
5286   (!strncmp (IDENTIFIER_POINTER (ID_NODE), VFIELD_NAME, \
5287             sizeof (VFIELD_NAME) - 1))
5288 #define VFIELD_NAME_FORMAT "__vptr_%s"
5289
5290 #endif  /* NO_DOLLAR_IN_LABEL */
5291 #endif  /* NO_DOT_IN_LABEL */
5292
5293 #define LAMBDANAME_PREFIX "__lambda"
5294 #define LAMBDANAME_FORMAT LAMBDANAME_PREFIX "%d"
5295
5296 #define UDLIT_OP_ANSI_PREFIX "operator\"\""
5297 #define UDLIT_OP_ANSI_FORMAT UDLIT_OP_ANSI_PREFIX "%s"
5298 #define UDLIT_OP_MANGLED_PREFIX "li"
5299 #define UDLIT_OP_MANGLED_FORMAT UDLIT_OP_MANGLED_PREFIX "%s"
5300 #define UDLIT_OPER_P(ID_NODE) \
5301   (!strncmp (IDENTIFIER_POINTER (ID_NODE), \
5302              UDLIT_OP_ANSI_PREFIX, \
5303              sizeof (UDLIT_OP_ANSI_PREFIX) - 1))
5304 #define UDLIT_OP_SUFFIX(ID_NODE) \
5305   (IDENTIFIER_POINTER (ID_NODE) + sizeof (UDLIT_OP_ANSI_PREFIX) - 1)
5306
5307 #if !defined(NO_DOLLAR_IN_LABEL) || !defined(NO_DOT_IN_LABEL)
5308
5309 #define VTABLE_NAME_P(ID_NODE) (IDENTIFIER_POINTER (ID_NODE)[1] == 'v' \
5310   && IDENTIFIER_POINTER (ID_NODE)[2] == 't' \
5311   && IDENTIFIER_POINTER (ID_NODE)[3] == JOINER)
5312
5313 #define VFIELD_NAME_P(ID_NODE) \
5314   (!strncmp (IDENTIFIER_POINTER (ID_NODE), VFIELD_NAME, sizeof(VFIELD_NAME)-1))
5315
5316 #endif /* !defined(NO_DOLLAR_IN_LABEL) || !defined(NO_DOT_IN_LABEL) */
5317
5318 \f
5319 /* Nonzero if we're done parsing and into end-of-file activities.
5320    Two if we're done with front-end processing.  */
5321
5322 extern int at_eof;
5323
5324 /* True if note_mangling_alias should enqueue mangling aliases for
5325    later generation, rather than emitting them right away.  */
5326
5327 extern bool defer_mangling_aliases;
5328
5329 /* True if noexcept is part of the type (i.e. in C++17).  */
5330
5331 extern bool flag_noexcept_type;
5332
5333 /* A list of namespace-scope objects which have constructors or
5334    destructors which reside in the global scope.  The decl is stored
5335    in the TREE_VALUE slot and the initializer is stored in the
5336    TREE_PURPOSE slot.  */
5337 extern GTY(()) tree static_aggregates;
5338 /* Likewise, for thread local storage.  */
5339 extern GTY(()) tree tls_aggregates;
5340
5341 enum overload_flags { NO_SPECIAL = 0, DTOR_FLAG, TYPENAME_FLAG };
5342
5343 /* These are uses as bits in flags passed to various functions to
5344    control their behavior.  Despite the LOOKUP_ prefix, many of these
5345    do not control name lookup.  ??? Functions using these flags should
5346    probably be modified to accept explicit boolean flags for the
5347    behaviors relevant to them.  */
5348 /* Check for access violations.  */
5349 #define LOOKUP_PROTECT (1 << 0)
5350 #define LOOKUP_NORMAL (LOOKUP_PROTECT)
5351 /* Even if the function found by lookup is a virtual function, it
5352    should be called directly.  */
5353 #define LOOKUP_NONVIRTUAL (1 << 1)
5354 /* Non-converting (i.e., "explicit") constructors are not tried.  This flag
5355    indicates that we are not performing direct-initialization.  */
5356 #define LOOKUP_ONLYCONVERTING (1 << 2)
5357 #define LOOKUP_IMPLICIT (LOOKUP_NORMAL | LOOKUP_ONLYCONVERTING)
5358 /* If a temporary is created, it should be created so that it lives
5359    as long as the current variable bindings; otherwise it only lives
5360    until the end of the complete-expression.  It also forces
5361    direct-initialization in cases where other parts of the compiler
5362    have already generated a temporary, such as reference
5363    initialization and the catch parameter.  */
5364 #define DIRECT_BIND (1 << 3)
5365 /* We're performing a user-defined conversion, so more user-defined
5366    conversions are not permitted (only built-in conversions).  */
5367 #define LOOKUP_NO_CONVERSION (1 << 4)
5368 /* The user has explicitly called a destructor.  (Therefore, we do
5369    not need to check that the object is non-NULL before calling the
5370    destructor.)  */
5371 #define LOOKUP_DESTRUCTOR (1 << 5)
5372 /* Do not permit references to bind to temporaries.  */
5373 #define LOOKUP_NO_TEMP_BIND (1 << 6)
5374 /* Do not accept objects, and possibly namespaces.  */
5375 #define LOOKUP_PREFER_TYPES (1 << 7)
5376 /* Do not accept objects, and possibly types.   */
5377 #define LOOKUP_PREFER_NAMESPACES (1 << 8)
5378 /* Accept types or namespaces.  */
5379 #define LOOKUP_PREFER_BOTH (LOOKUP_PREFER_TYPES | LOOKUP_PREFER_NAMESPACES)
5380 /* Return friend declarations and un-declared builtin functions.
5381    (Normally, these entities are registered in the symbol table, but
5382    not found by lookup.)  */
5383 #define LOOKUP_HIDDEN (LOOKUP_PREFER_NAMESPACES << 1)
5384 /* We're trying to treat an lvalue as an rvalue.  */
5385 #define LOOKUP_PREFER_RVALUE (LOOKUP_HIDDEN << 1)
5386 /* We're inside an init-list, so narrowing conversions are ill-formed.  */
5387 #define LOOKUP_NO_NARROWING (LOOKUP_PREFER_RVALUE << 1)
5388 /* We're looking up a constructor for list-initialization.  */
5389 #define LOOKUP_LIST_INIT_CTOR (LOOKUP_NO_NARROWING << 1)
5390 /* This is the first parameter of a copy constructor.  */
5391 #define LOOKUP_COPY_PARM (LOOKUP_LIST_INIT_CTOR << 1)
5392 /* We only want to consider list constructors.  */
5393 #define LOOKUP_LIST_ONLY (LOOKUP_COPY_PARM << 1)
5394 /* Return after determining which function to call and checking access.
5395    Used by sythesized_method_walk to determine which functions will
5396    be called to initialize subobjects, in order to determine exception
5397    specification and possible implicit delete.
5398    This is kind of a hack, but exiting early avoids problems with trying
5399    to perform argument conversions when the class isn't complete yet.  */
5400 #define LOOKUP_SPECULATIVE (LOOKUP_LIST_ONLY << 1)
5401 /* Used by calls from defaulted functions to limit the overload set to avoid
5402    cycles trying to declare them (core issue 1092).  */
5403 #define LOOKUP_DEFAULTED (LOOKUP_SPECULATIVE << 1)
5404 /* Used in calls to store_init_value to suppress its usual call to
5405    digest_init.  */
5406 #define LOOKUP_ALREADY_DIGESTED (LOOKUP_DEFAULTED << 1)
5407 /* An instantiation with explicit template arguments.  */
5408 #define LOOKUP_EXPLICIT_TMPL_ARGS (LOOKUP_ALREADY_DIGESTED << 1)
5409 /* Like LOOKUP_NO_TEMP_BIND, but also prevent binding to xvalues.  */
5410 #define LOOKUP_NO_RVAL_BIND (LOOKUP_EXPLICIT_TMPL_ARGS << 1)
5411 /* Used by case_conversion to disregard non-integral conversions.  */
5412 #define LOOKUP_NO_NON_INTEGRAL (LOOKUP_NO_RVAL_BIND << 1)
5413 /* Used for delegating constructors in order to diagnose self-delegation.  */
5414 #define LOOKUP_DELEGATING_CONS (LOOKUP_NO_NON_INTEGRAL << 1)
5415
5416 #define LOOKUP_NAMESPACES_ONLY(F)  \
5417   (((F) & LOOKUP_PREFER_NAMESPACES) && !((F) & LOOKUP_PREFER_TYPES))
5418 #define LOOKUP_TYPES_ONLY(F)  \
5419   (!((F) & LOOKUP_PREFER_NAMESPACES) && ((F) & LOOKUP_PREFER_TYPES))
5420 #define LOOKUP_QUALIFIERS_ONLY(F)     ((F) & LOOKUP_PREFER_BOTH)
5421
5422
5423 /* These flags are used by the conversion code.
5424    CONV_IMPLICIT   :  Perform implicit conversions (standard and user-defined).
5425    CONV_STATIC     :  Perform the explicit conversions for static_cast.
5426    CONV_CONST      :  Perform the explicit conversions for const_cast.
5427    CONV_REINTERPRET:  Perform the explicit conversions for reinterpret_cast.
5428    CONV_PRIVATE    :  Perform upcasts to private bases.
5429    CONV_FORCE_TEMP :  Require a new temporary when converting to the same
5430                       aggregate type.  */
5431
5432 #define CONV_IMPLICIT    1
5433 #define CONV_STATIC      2
5434 #define CONV_CONST       4
5435 #define CONV_REINTERPRET 8
5436 #define CONV_PRIVATE     16
5437 /* #define CONV_NONCONVERTING 32 */
5438 #define CONV_FORCE_TEMP  64
5439 #define CONV_FOLD        128
5440 #define CONV_OLD_CONVERT (CONV_IMPLICIT | CONV_STATIC | CONV_CONST \
5441                           | CONV_REINTERPRET)
5442 #define CONV_C_CAST      (CONV_IMPLICIT | CONV_STATIC | CONV_CONST \
5443                           | CONV_REINTERPRET | CONV_PRIVATE | CONV_FORCE_TEMP)
5444 #define CONV_BACKEND_CONVERT (CONV_OLD_CONVERT | CONV_FOLD)
5445
5446 /* Used by build_expr_type_conversion to indicate which types are
5447    acceptable as arguments to the expression under consideration.  */
5448
5449 #define WANT_INT        1 /* integer types, including bool */
5450 #define WANT_FLOAT      2 /* floating point types */
5451 #define WANT_ENUM       4 /* enumerated types */
5452 #define WANT_POINTER    8 /* pointer types */
5453 #define WANT_NULL      16 /* null pointer constant */
5454 #define WANT_VECTOR_OR_COMPLEX 32 /* vector or complex types */
5455 #define WANT_ARITH      (WANT_INT | WANT_FLOAT | WANT_VECTOR_OR_COMPLEX)
5456
5457 /* Used with comptypes, and related functions, to guide type
5458    comparison.  */
5459
5460 #define COMPARE_STRICT        0 /* Just check if the types are the
5461                                    same.  */
5462 #define COMPARE_BASE          1 /* Check to see if the second type is
5463                                    derived from the first.  */
5464 #define COMPARE_DERIVED       2 /* Like COMPARE_BASE, but in
5465                                    reverse.  */
5466 #define COMPARE_REDECLARATION 4 /* The comparison is being done when
5467                                    another declaration of an existing
5468                                    entity is seen.  */
5469 #define COMPARE_STRUCTURAL    8 /* The comparison is intended to be
5470                                    structural. The actual comparison
5471                                    will be identical to
5472                                    COMPARE_STRICT.  */
5473
5474 /* Used with start function.  */
5475 #define SF_DEFAULT           0  /* No flags.  */
5476 #define SF_PRE_PARSED        1  /* The function declaration has
5477                                    already been parsed.  */
5478 #define SF_INCLASS_INLINE    2  /* The function is an inline, defined
5479                                    in the class body.  */
5480
5481 /* Used with start_decl's initialized parameter.  */
5482 #define SD_UNINITIALIZED     0
5483 #define SD_INITIALIZED       1
5484 #define SD_DEFAULTED         2
5485 #define SD_DELETED           3
5486
5487 /* Returns nonzero iff TYPE1 and TYPE2 are the same type, or if TYPE2
5488    is derived from TYPE1, or if TYPE2 is a pointer (reference) to a
5489    class derived from the type pointed to (referred to) by TYPE1.  */
5490 #define same_or_base_type_p(TYPE1, TYPE2) \
5491   comptypes ((TYPE1), (TYPE2), COMPARE_BASE)
5492
5493 /* These macros are used to access a TEMPLATE_PARM_INDEX.  */
5494 #define TEMPLATE_PARM_INDEX_CAST(NODE) \
5495         ((template_parm_index*)TEMPLATE_PARM_INDEX_CHECK (NODE))
5496 #define TEMPLATE_PARM_IDX(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->index)
5497 #define TEMPLATE_PARM_LEVEL(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->level)
5498 #define TEMPLATE_PARM_DESCENDANTS(NODE) (TREE_CHAIN (NODE))
5499 #define TEMPLATE_PARM_ORIG_LEVEL(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->orig_level)
5500 #define TEMPLATE_PARM_DECL(NODE) (TEMPLATE_PARM_INDEX_CAST (NODE)->decl)
5501 #define TEMPLATE_PARM_PARAMETER_PACK(NODE) \
5502   (TREE_LANG_FLAG_0 (TEMPLATE_PARM_INDEX_CHECK (NODE)))
5503
5504 /* These macros are for accessing the fields of TEMPLATE_TYPE_PARM,
5505    TEMPLATE_TEMPLATE_PARM and BOUND_TEMPLATE_TEMPLATE_PARM nodes.  */
5506 #define TEMPLATE_TYPE_PARM_INDEX(NODE)                                  \
5507   (TYPE_VALUES_RAW (TREE_CHECK3 ((NODE), TEMPLATE_TYPE_PARM,            \
5508                                  TEMPLATE_TEMPLATE_PARM,                \
5509                                  BOUND_TEMPLATE_TEMPLATE_PARM)))
5510 #define TEMPLATE_TYPE_IDX(NODE) \
5511   (TEMPLATE_PARM_IDX (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5512 #define TEMPLATE_TYPE_LEVEL(NODE) \
5513   (TEMPLATE_PARM_LEVEL (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5514 #define TEMPLATE_TYPE_ORIG_LEVEL(NODE) \
5515   (TEMPLATE_PARM_ORIG_LEVEL (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5516 #define TEMPLATE_TYPE_DECL(NODE) \
5517   (TEMPLATE_PARM_DECL (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5518 #define TEMPLATE_TYPE_PARAMETER_PACK(NODE) \
5519   (TEMPLATE_PARM_PARAMETER_PACK (TEMPLATE_TYPE_PARM_INDEX (NODE)))
5520
5521 /* For a C++17 class deduction placeholder, the template it represents.  */
5522 #define CLASS_PLACEHOLDER_TEMPLATE(NODE) \
5523   (DECL_INITIAL (TYPE_NAME (TEMPLATE_TYPE_PARM_CHECK (NODE))))
5524
5525 /* Contexts in which auto deduction occurs. These flags are
5526    used to control diagnostics in do_auto_deduction.  */
5527
5528 enum auto_deduction_context
5529 {
5530   adc_unspecified,   /* Not given */
5531   adc_variable_type, /* Variable initializer deduction */
5532   adc_return_type,   /* Return type deduction */
5533   adc_unify,         /* Template argument deduction */
5534   adc_requirement,   /* Argument deduction constraint */
5535   adc_decomp_type    /* Decomposition declaration initializer deduction */
5536 };
5537
5538 /* True if this type-parameter belongs to a class template, used by C++17
5539    class template argument deduction.  */
5540 #define TEMPLATE_TYPE_PARM_FOR_CLASS(NODE) \
5541   (TREE_LANG_FLAG_0 (TEMPLATE_TYPE_PARM_CHECK (NODE)))
5542
5543 /* True iff this TEMPLATE_TYPE_PARM represents decltype(auto).  */
5544 #define AUTO_IS_DECLTYPE(NODE) \
5545   (TYPE_LANG_FLAG_5 (TEMPLATE_TYPE_PARM_CHECK (NODE)))
5546
5547 /* These constants can used as bit flags in the process of tree formatting.
5548
5549    TFF_PLAIN_IDENTIFIER: unqualified part of a name.
5550    TFF_SCOPE: include the class and namespace scope of the name.
5551    TFF_CHASE_TYPEDEF: print the original type-id instead of the typedef-name.
5552    TFF_DECL_SPECIFIERS: print decl-specifiers.
5553    TFF_CLASS_KEY_OR_ENUM: precede a class-type name (resp. enum name) with
5554        a class-key (resp. `enum').
5555    TFF_RETURN_TYPE: include function return type.
5556    TFF_FUNCTION_DEFAULT_ARGUMENTS: include function default parameter values.
5557    TFF_EXCEPTION_SPECIFICATION: show function exception specification.
5558    TFF_TEMPLATE_HEADER: show the template<...> header in a
5559        template-declaration.
5560    TFF_TEMPLATE_NAME: show only template-name.
5561    TFF_EXPR_IN_PARENS: parenthesize expressions.
5562    TFF_NO_FUNCTION_ARGUMENTS: don't show function arguments.
5563    TFF_UNQUALIFIED_NAME: do not print the qualifying scope of the
5564        top-level entity.
5565    TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS: do not omit template arguments
5566        identical to their defaults.
5567    TFF_NO_TEMPLATE_BINDINGS: do not print information about the template
5568        arguments for a function template specialization.
5569    TFF_POINTER: we are printing a pointer type.  */
5570
5571 #define TFF_PLAIN_IDENTIFIER                    (0)
5572 #define TFF_SCOPE                               (1)
5573 #define TFF_CHASE_TYPEDEF                       (1 << 1)
5574 #define TFF_DECL_SPECIFIERS                     (1 << 2)
5575 #define TFF_CLASS_KEY_OR_ENUM                   (1 << 3)
5576 #define TFF_RETURN_TYPE                         (1 << 4)
5577 #define TFF_FUNCTION_DEFAULT_ARGUMENTS          (1 << 5)
5578 #define TFF_EXCEPTION_SPECIFICATION             (1 << 6)
5579 #define TFF_TEMPLATE_HEADER                     (1 << 7)
5580 #define TFF_TEMPLATE_NAME                       (1 << 8)
5581 #define TFF_EXPR_IN_PARENS                      (1 << 9)
5582 #define TFF_NO_FUNCTION_ARGUMENTS               (1 << 10)
5583 #define TFF_UNQUALIFIED_NAME                    (1 << 11)
5584 #define TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS  (1 << 12)
5585 #define TFF_NO_TEMPLATE_BINDINGS                (1 << 13)
5586 #define TFF_POINTER                             (1 << 14)
5587
5588 /* Returns the TEMPLATE_DECL associated to a TEMPLATE_TEMPLATE_PARM
5589    node.  */
5590 #define TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL(NODE)      \
5591   ((TREE_CODE (NODE) == BOUND_TEMPLATE_TEMPLATE_PARM)   \
5592    ? TYPE_TI_TEMPLATE (NODE)                            \
5593    : TYPE_NAME (NODE))
5594
5595 /* in lex.c  */
5596
5597 extern void init_reswords (void);
5598
5599 /* Various flags for the overloaded operator information.  */
5600 enum ovl_op_flags
5601   {
5602     OVL_OP_FLAG_NONE = 0,       /* Don't care.  */
5603     OVL_OP_FLAG_UNARY = 1,      /* Is unary.  */
5604     OVL_OP_FLAG_BINARY = 2,     /* Is binary.  */
5605     OVL_OP_FLAG_AMBIARY = 3,    /* May be unary or binary.  */
5606     OVL_OP_FLAG_ALLOC = 4,      /* operator new or delete.  */
5607     OVL_OP_FLAG_DELETE = 1,     /* operator delete.  */
5608     OVL_OP_FLAG_VEC = 2         /* vector new or delete.  */
5609   };
5610
5611 /* Compressed operator codes.  Order is determined by operators.def
5612    and does not match that of tree_codes.  */
5613 enum ovl_op_code
5614   {
5615     OVL_OP_ERROR_MARK,
5616     OVL_OP_NOP_EXPR,
5617 #define DEF_OPERATOR(NAME, CODE, MANGLING, FLAGS) OVL_OP_##CODE,
5618 #define DEF_ASSN_OPERATOR(NAME, CODE, MANGLING) /* NOTHING */
5619 #include "operators.def"
5620     OVL_OP_MAX
5621   };
5622
5623 struct GTY(()) ovl_op_info_t {
5624   /* The IDENTIFIER_NODE for the operator.  */
5625   tree identifier;
5626   /* The name of the operator.  */
5627   const char *name;
5628   /* The mangled name of the operator.  */
5629   const char *mangled_name;
5630   /* The (regular) tree code.  */
5631   enum tree_code tree_code : 16;
5632   /* The (compressed) operator code.  */
5633   enum ovl_op_code ovl_op_code : 8;
5634   /* The ovl_op_flags of the operator */
5635   unsigned flags : 8;
5636 };
5637
5638 /* Overloaded operator info indexed by ass_op_p & ovl_op_code.  */
5639 extern GTY(()) ovl_op_info_t ovl_op_info[2][OVL_OP_MAX];
5640 /* Mapping from tree_codes to ovl_op_codes.  */
5641 extern GTY(()) unsigned char ovl_op_mapping[MAX_TREE_CODES];
5642 /* Mapping for ambi-ary operators from the binary to the unary.  */
5643 extern GTY(()) unsigned char ovl_op_alternate[OVL_OP_MAX];
5644
5645 /* Given an ass_op_p boolean and a tree code, return a pointer to its
5646    overloaded operator info.  Tree codes for non-overloaded operators
5647    map to the error-operator.  */
5648 #define OVL_OP_INFO(IS_ASS_P, TREE_CODE)                        \
5649   (&ovl_op_info[(IS_ASS_P) != 0][ovl_op_mapping[(TREE_CODE)]])
5650 /* Overloaded operator info for an identifier for which
5651    IDENTIFIER_OVL_OP_P is true.  */
5652 #define IDENTIFIER_OVL_OP_INFO(NODE) \
5653   (&ovl_op_info[IDENTIFIER_KIND_BIT_0 (NODE)][IDENTIFIER_CP_INDEX (NODE)])
5654 #define IDENTIFIER_OVL_OP_FLAGS(NODE) \
5655   (IDENTIFIER_OVL_OP_INFO (NODE)->flags)
5656
5657 /* A type-qualifier, or bitmask therefore, using the TYPE_QUAL
5658    constants.  */
5659
5660 typedef int cp_cv_quals;
5661
5662 /* Non-static member functions have an optional virt-specifier-seq.
5663    There is a VIRT_SPEC value for each virt-specifier.
5664    They can be combined by bitwise-or to form the complete set of
5665    virt-specifiers for a member function.  */
5666 enum virt_specifier
5667   {
5668     VIRT_SPEC_UNSPECIFIED = 0x0,
5669     VIRT_SPEC_FINAL       = 0x1,
5670     VIRT_SPEC_OVERRIDE    = 0x2
5671   };
5672
5673 /* A type-qualifier, or bitmask therefore, using the VIRT_SPEC
5674    constants.  */
5675
5676 typedef int cp_virt_specifiers;
5677
5678 /* Wherever there is a function-cv-qual, there could also be a ref-qualifier:
5679
5680    [dcl.fct]
5681    The return type, the parameter-type-list, the ref-qualifier, and
5682    the cv-qualifier-seq, but not the default arguments or the exception
5683    specification, are part of the function type.
5684
5685    REF_QUAL_NONE    Ordinary member function with no ref-qualifier
5686    REF_QUAL_LVALUE  Member function with the &-ref-qualifier
5687    REF_QUAL_RVALUE  Member function with the &&-ref-qualifier */
5688
5689 enum cp_ref_qualifier {
5690   REF_QUAL_NONE = 0,
5691   REF_QUAL_LVALUE = 1,
5692   REF_QUAL_RVALUE = 2
5693 };
5694
5695 /* A storage class.  */
5696
5697 enum cp_storage_class {
5698   /* sc_none must be zero so that zeroing a cp_decl_specifier_seq
5699      sets the storage_class field to sc_none.  */
5700   sc_none = 0,
5701   sc_auto,
5702   sc_register,
5703   sc_static,
5704   sc_extern,
5705   sc_mutable
5706 };
5707
5708 /* An individual decl-specifier.  This is used to index the array of
5709    locations for the declspecs in struct cp_decl_specifier_seq
5710    below.  */
5711
5712 enum cp_decl_spec {
5713   ds_first,
5714   ds_signed = ds_first,
5715   ds_unsigned,
5716   ds_short,
5717   ds_long,
5718   ds_const,
5719   ds_volatile,
5720   ds_restrict,
5721   ds_inline,
5722   ds_virtual,
5723   ds_explicit,
5724   ds_friend,
5725   ds_typedef,
5726   ds_alias,
5727   ds_constexpr,
5728   ds_complex,
5729   ds_thread,
5730   ds_type_spec,
5731   ds_redefined_builtin_type_spec,
5732   ds_attribute,
5733   ds_std_attribute,
5734   ds_storage_class,
5735   ds_long_long,
5736   ds_concept,
5737   ds_last /* This enumerator must always be the last one.  */
5738 };
5739
5740 /* A decl-specifier-seq.  */
5741
5742 struct cp_decl_specifier_seq {
5743   /* An array of locations for the declaration sepecifiers, indexed by
5744      enum cp_decl_spec_word.  */
5745   source_location locations[ds_last];
5746   /* The primary type, if any, given by the decl-specifier-seq.
5747      Modifiers, like "short", "const", and "unsigned" are not
5748      reflected here.  This field will be a TYPE, unless a typedef-name
5749      was used, in which case it will be a TYPE_DECL.  */
5750   tree type;
5751   /* The attributes, if any, provided with the specifier sequence.  */
5752   tree attributes;
5753   /* The c++11 attributes that follows the type specifier.  */
5754   tree std_attributes;
5755   /* If non-NULL, a built-in type that the user attempted to redefine
5756      to some other type.  */
5757   tree redefined_builtin_type;
5758   /* The explicit-specifier, if any.  */
5759   tree explicit_specifier;
5760   /* The storage class specified -- or sc_none if no storage class was
5761      explicitly specified.  */
5762   cp_storage_class storage_class;
5763   /* For the __intN declspec, this stores the index into the int_n_* arrays.  */
5764   int int_n_idx;
5765   /* True iff TYPE_SPEC defines a class or enum.  */
5766   BOOL_BITFIELD type_definition_p : 1;
5767   /* True iff multiple types were (erroneously) specified for this
5768      decl-specifier-seq.  */
5769   BOOL_BITFIELD multiple_types_p : 1;
5770   /* True iff multiple storage classes were (erroneously) specified
5771      for this decl-specifier-seq or a combination of a storage class
5772      with a typedef specifier.  */
5773   BOOL_BITFIELD conflicting_specifiers_p : 1;
5774   /* True iff at least one decl-specifier was found.  */
5775   BOOL_BITFIELD any_specifiers_p : 1;
5776   /* True iff at least one type-specifier was found.  */
5777   BOOL_BITFIELD any_type_specifiers_p : 1;
5778   /* True iff "int" was explicitly provided.  */
5779   BOOL_BITFIELD explicit_int_p : 1;
5780   /* True iff "__intN" was explicitly provided.  */
5781   BOOL_BITFIELD explicit_intN_p : 1;
5782   /* True iff "char" was explicitly provided.  */
5783   BOOL_BITFIELD explicit_char_p : 1;
5784   /* True iff ds_thread is set for __thread, not thread_local.  */
5785   BOOL_BITFIELD gnu_thread_keyword_p : 1;
5786   /* True iff the type is a decltype.  */
5787   BOOL_BITFIELD decltype_p : 1;
5788 };
5789
5790 /* The various kinds of declarators.  */
5791
5792 enum cp_declarator_kind {
5793   cdk_id,
5794   cdk_function,
5795   cdk_array,
5796   cdk_pointer,
5797   cdk_reference,
5798   cdk_ptrmem,
5799   cdk_decomp,
5800   cdk_error
5801 };
5802
5803 /* A declarator.  */
5804
5805 typedef struct cp_declarator cp_declarator;
5806
5807 typedef struct cp_parameter_declarator cp_parameter_declarator;
5808
5809 /* A parameter, before it has been semantically analyzed.  */
5810 struct cp_parameter_declarator {
5811   /* The next parameter, or NULL_TREE if none.  */
5812   cp_parameter_declarator *next;
5813   /* The decl-specifiers-seq for the parameter.  */
5814   cp_decl_specifier_seq decl_specifiers;
5815   /* The declarator for the parameter.  */
5816   cp_declarator *declarator;
5817   /* The default-argument expression, or NULL_TREE, if none.  */
5818   tree default_argument;
5819   /* True iff this is a template parameter pack.  */
5820   bool template_parameter_pack_p;
5821   /* Location within source.  */
5822   location_t loc;
5823 };
5824
5825 /* A declarator.  */
5826 struct cp_declarator {
5827   /* The kind of declarator.  */
5828   ENUM_BITFIELD (cp_declarator_kind) kind : 4;
5829   /* Whether we parsed an ellipsis (`...') just before the declarator,
5830      to indicate this is a parameter pack.  */
5831   BOOL_BITFIELD parameter_pack_p : 1;
5832   /* If this declarator is parenthesized, this the open-paren.  It is
5833      UNKNOWN_LOCATION when not parenthesized.  */
5834   location_t parenthesized;
5835
5836   location_t id_loc; /* Currently only set for cdk_id, cdk_decomp and
5837                         cdk_function. */
5838   /* GNU Attributes that apply to this declarator.  If the declarator
5839      is a pointer or a reference, these attribute apply to the type
5840      pointed to.  */
5841   tree attributes;
5842   /* Standard C++11 attributes that apply to this declarator.  If the
5843      declarator is a pointer or a reference, these attributes apply
5844      to the pointer, rather than to the type pointed to.  */
5845   tree std_attributes;
5846   /* For all but cdk_id, cdk_decomp and cdk_error, the contained declarator.
5847      For cdk_id, cdk_decomp and cdk_error, guaranteed to be NULL.  */
5848   cp_declarator *declarator;
5849   union {
5850     /* For identifiers.  */
5851     struct {
5852       /* If non-NULL, the qualifying scope (a NAMESPACE_DECL or
5853          *_TYPE) for this identifier.  */
5854       tree qualifying_scope;
5855       /* The unqualified name of the entity -- an IDENTIFIER_NODE,
5856          BIT_NOT_EXPR, or TEMPLATE_ID_EXPR.  */
5857       tree unqualified_name;
5858       /* If this is the name of a function, what kind of special
5859          function (if any).  */
5860       special_function_kind sfk;
5861     } id;
5862     /* For functions.  */
5863     struct {
5864       /* The parameters to the function as a TREE_LIST of decl/default.  */
5865       tree parameters;
5866       /* The cv-qualifiers for the function.  */
5867       cp_cv_quals qualifiers;
5868       /* The virt-specifiers for the function.  */
5869       cp_virt_specifiers virt_specifiers;
5870       /* The ref-qualifier for the function.  */
5871       cp_ref_qualifier ref_qualifier;
5872       /* The transaction-safety qualifier for the function.  */
5873       tree tx_qualifier;
5874       /* The exception-specification for the function.  */
5875       tree exception_specification;
5876       /* The late-specified return type, if any.  */
5877       tree late_return_type;
5878       /* The trailing requires-clause, if any. */
5879       tree requires_clause;
5880     } function;
5881     /* For arrays.  */
5882     struct {
5883       /* The bounds to the array.  */
5884       tree bounds;
5885     } array;
5886     /* For cdk_pointer and cdk_ptrmem.  */
5887     struct {
5888       /* The cv-qualifiers for the pointer.  */
5889       cp_cv_quals qualifiers;
5890       /* For cdk_ptrmem, the class type containing the member.  */
5891       tree class_type;
5892     } pointer;
5893     /* For cdk_reference */
5894     struct {
5895       /* The cv-qualifiers for the reference.  These qualifiers are
5896          only used to diagnose ill-formed code.  */
5897       cp_cv_quals qualifiers;
5898       /* Whether this is an rvalue reference */
5899       bool rvalue_ref;
5900     } reference;
5901   } u;
5902 };
5903
5904 /* A level of template instantiation.  */
5905 struct GTY((chain_next ("%h.next"))) tinst_level {
5906   /* The immediately deeper level in the chain.  */
5907   struct tinst_level *next;
5908
5909   /* The original node.  TLDCL can be a DECL (for a function or static
5910      data member), a TYPE (for a class), depending on what we were
5911      asked to instantiate, or a TREE_LIST with the template as PURPOSE
5912      and the template args as VALUE, if we are substituting for
5913      overload resolution.  In all these cases, TARGS is NULL.
5914      However, to avoid creating TREE_LIST objects for substitutions if
5915      we can help, we store PURPOSE and VALUE in TLDCL and TARGS,
5916      respectively.  So TLDCL stands for TREE_LIST or DECL (the
5917      template is a DECL too), whereas TARGS stands for the template
5918      arguments.  */
5919   tree tldcl, targs;
5920
5921  private:
5922   /* Return TRUE iff the original node is a split list.  */
5923   bool split_list_p () const { return targs; }
5924
5925   /* Return TRUE iff the original node is a TREE_LIST object.  */
5926   bool tree_list_p () const
5927   {
5928     return !split_list_p () && TREE_CODE (tldcl) == TREE_LIST;
5929   }
5930
5931   /* Return TRUE iff the original node is not a list, split or not.  */
5932   bool not_list_p () const
5933   {
5934     return !split_list_p () && !tree_list_p ();
5935   }
5936
5937   /* Convert (in place) the original node from a split list to a
5938      TREE_LIST.  */
5939   tree to_list ();
5940
5941  public:
5942   /* Release storage for OBJ and node, if it's a TREE_LIST.  */
5943   static void free (tinst_level *obj);
5944
5945   /* Return TRUE iff the original node is a list, split or not.  */
5946   bool list_p () const { return !not_list_p (); }
5947
5948   /* Return the original node; if it's a split list, make it a
5949      TREE_LIST first, so that it can be returned as a single tree
5950      object.  */
5951   tree get_node () {
5952     if (!split_list_p ()) return tldcl;
5953     else return to_list ();
5954   }
5955
5956   /* Return the original node if it's a DECL or a TREE_LIST, but do
5957      NOT convert a split list to a TREE_LIST: return NULL instead.  */
5958   tree maybe_get_node () const {
5959     if (!split_list_p ()) return tldcl;
5960     else return NULL_TREE;
5961   }
5962
5963   /* The location where the template is instantiated.  */
5964   location_t locus;
5965
5966   /* errorcount + sorrycount when we pushed this level.  */
5967   unsigned short errors;
5968
5969   /* Count references to this object.  If refcount reaches
5970      refcount_infinity value, we don't increment or decrement the
5971      refcount anymore, as the refcount isn't accurate anymore.
5972      The object can be still garbage collected if unreferenced from
5973      anywhere, which might keep referenced objects referenced longer than
5974      otherwise necessary.  Hitting the infinity is rare though.  */
5975   unsigned short refcount;
5976
5977   /* Infinity value for the above refcount.  */
5978   static const unsigned short refcount_infinity = (unsigned short) ~0;
5979 };
5980
5981 /* BUILT_IN_FRONTEND function codes.  */
5982 enum cp_built_in_function {
5983   CP_BUILT_IN_IS_CONSTANT_EVALUATED,
5984   CP_BUILT_IN_INTEGER_PACK,
5985   CP_BUILT_IN_LAST
5986 };
5987
5988 bool decl_spec_seq_has_spec_p (const cp_decl_specifier_seq *, cp_decl_spec);
5989
5990 /* Return the type of the `this' parameter of FNTYPE.  */
5991
5992 inline tree
5993 type_of_this_parm (const_tree fntype)
5994 {
5995   function_args_iterator iter;
5996   gcc_assert (TREE_CODE (fntype) == METHOD_TYPE);
5997   function_args_iter_init (&iter, fntype);
5998   return function_args_iter_cond (&iter);
5999 }
6000
6001 /* Return the class of the `this' parameter of FNTYPE.  */
6002
6003 inline tree
6004 class_of_this_parm (const_tree fntype)
6005 {
6006   return TREE_TYPE (type_of_this_parm (fntype));
6007 }
6008
6009 /* True iff T is a variable template declaration. */
6010 inline bool
6011 variable_template_p (tree t)
6012 {
6013   if (TREE_CODE (t) != TEMPLATE_DECL)
6014     return false;
6015   if (!PRIMARY_TEMPLATE_P (t))
6016     return false;
6017   if (tree r = DECL_TEMPLATE_RESULT (t))
6018     return VAR_P (r);
6019   return false;
6020 }
6021
6022 /* True iff T is a variable concept definition. That is, T is
6023    a variable template declared with the concept specifier. */
6024 inline bool
6025 variable_concept_p (tree t)
6026 {
6027   if (TREE_CODE (t) != TEMPLATE_DECL)
6028     return false;
6029   if (tree r = DECL_TEMPLATE_RESULT (t))
6030     return VAR_P (r) && DECL_DECLARED_CONCEPT_P (r);
6031   return false;
6032 }
6033
6034 /* True iff T is a concept definition. That is, T is a variable or function
6035    template declared with the concept specifier. */
6036 inline bool
6037 concept_template_p (tree t)
6038 {
6039   if (TREE_CODE (t) != TEMPLATE_DECL)
6040     return false;
6041   if (tree r = DECL_TEMPLATE_RESULT (t))
6042     return VAR_OR_FUNCTION_DECL_P (r) && DECL_DECLARED_CONCEPT_P (r);
6043   return false;
6044 }
6045
6046 /* A parameter list indicating for a function with no parameters,
6047    e.g  "int f(void)".  */
6048 extern cp_parameter_declarator *no_parameters;
6049
6050 /* Various dump ids.  */
6051 extern int class_dump_id;
6052 extern int raw_dump_id;
6053
6054 /* in call.c */
6055 extern bool check_dtor_name                     (tree, tree);
6056 int magic_varargs_p                             (tree);
6057
6058 extern tree build_conditional_expr              (location_t, tree, tree, tree,
6059                                                  tsubst_flags_t);
6060 extern tree build_addr_func                     (tree, tsubst_flags_t);
6061 extern void set_flags_from_callee               (tree);
6062 extern tree build_call_a                        (tree, int, tree*);
6063 extern tree build_call_n                        (tree, int, ...);
6064 extern bool null_ptr_cst_p                      (tree);
6065 extern bool null_member_pointer_value_p         (tree);
6066 extern bool sufficient_parms_p                  (const_tree);
6067 extern tree type_decays_to                      (tree);
6068 extern tree extract_call_expr                   (tree);
6069 extern tree build_trivial_dtor_call             (tree);
6070 extern tree build_user_type_conversion          (tree, tree, int,
6071                                                  tsubst_flags_t);
6072 extern tree build_new_function_call             (tree, vec<tree, va_gc> **,
6073                                                  tsubst_flags_t);
6074 extern tree build_operator_new_call             (tree, vec<tree, va_gc> **,
6075                                                  tree *, tree *, tree, tree,
6076                                                  tree *, tsubst_flags_t);
6077 extern tree build_new_method_call               (tree, tree,
6078                                                  vec<tree, va_gc> **, tree,
6079                                                  int, tree *, tsubst_flags_t);
6080 extern tree build_special_member_call           (tree, tree,
6081                                                  vec<tree, va_gc> **,
6082                                                  tree, int, tsubst_flags_t);
6083 extern tree build_new_op                        (location_t, enum tree_code,
6084                                                  int, tree, tree, tree, tree *,
6085                                                  tsubst_flags_t);
6086 extern tree build_op_call                       (tree, vec<tree, va_gc> **,
6087                                                  tsubst_flags_t);
6088 extern bool aligned_allocation_fn_p             (tree);
6089 extern bool usual_deallocation_fn_p             (tree);
6090 extern tree build_op_delete_call                (enum tree_code, tree, tree,
6091                                                  bool, tree, tree,
6092                                                  tsubst_flags_t);
6093 extern bool can_convert                         (tree, tree, tsubst_flags_t);
6094 extern bool can_convert_standard                (tree, tree, tsubst_flags_t);
6095 extern bool can_convert_arg                     (tree, tree, tree, int,
6096                                                  tsubst_flags_t);
6097 extern bool can_convert_arg_bad                 (tree, tree, tree, int,
6098                                                  tsubst_flags_t);
6099 extern int conv_flags                           (int, int, tree, tree, int);
6100 extern struct conversion * good_conversion      (tree, tree, tree, int, tsubst_flags_t);
6101 extern location_t get_fndecl_argument_location  (tree, int);
6102 extern void complain_about_bad_argument (location_t arg_loc,
6103                                                  tree from_type, tree to_type,
6104                                                  tree fndecl, int parmnum);
6105
6106
6107 /* A class for recording information about access failures (e.g. private
6108    fields), so that we can potentially supply a fix-it hint about
6109    an accessor (from a context in which the constness of the object
6110    is known).  */
6111
6112 class access_failure_info
6113 {
6114  public:
6115   access_failure_info () : m_was_inaccessible (false),
6116     m_basetype_path (NULL_TREE),
6117     m_decl (NULL_TREE), m_diag_decl (NULL_TREE) {}
6118
6119   void record_access_failure (tree basetype_path, tree decl, tree diag_decl);
6120
6121   bool was_inaccessible_p () const { return m_was_inaccessible; }
6122   tree get_decl () const { return m_decl; }
6123   tree get_diag_decl () const { return m_diag_decl; }
6124   tree get_any_accessor (bool const_p) const;
6125   void maybe_suggest_accessor (bool const_p) const;
6126   static void add_fixit_hint (rich_location *richloc, tree accessor);
6127
6128  private:
6129   bool m_was_inaccessible;
6130   tree m_basetype_path;
6131   tree m_decl;
6132   tree m_diag_decl;
6133 };
6134
6135 extern void complain_about_access               (tree, tree, bool);
6136 extern bool enforce_access                      (tree, tree, tree,
6137                                                  tsubst_flags_t,
6138                                                  access_failure_info *afi = NULL);
6139 extern void push_defarg_context                 (tree);
6140 extern void pop_defarg_context                  (void);
6141 extern tree convert_default_arg                 (tree, tree, tree, int,
6142                                                  tsubst_flags_t);
6143 extern tree convert_arg_to_ellipsis             (tree, tsubst_flags_t);
6144 extern tree build_x_va_arg                      (source_location, tree, tree);
6145 extern tree cxx_type_promotes_to                (tree);
6146 extern tree type_passed_as                      (tree);
6147 extern tree convert_for_arg_passing             (tree, tree, tsubst_flags_t);
6148 extern bool is_properly_derived_from            (tree, tree);
6149 extern tree initialize_reference                (tree, tree, int,
6150                                                  tsubst_flags_t);
6151 extern tree extend_ref_init_temps               (tree, tree, vec<tree, va_gc>**);
6152 extern tree make_temporary_var_for_ref_to_temp  (tree, tree);
6153 extern bool type_has_extended_temps             (tree);
6154 extern tree strip_top_quals                     (tree);
6155 extern bool reference_related_p                 (tree, tree);
6156 extern int remaining_arguments                  (tree);
6157 extern tree perform_implicit_conversion         (tree, tree, tsubst_flags_t);
6158 extern tree perform_implicit_conversion_flags   (tree, tree, tsubst_flags_t, int);
6159 extern tree build_converted_constant_expr       (tree, tree, tsubst_flags_t);
6160 extern tree perform_direct_initialization_if_possible (tree, tree, bool,
6161                                                        tsubst_flags_t);
6162 extern tree in_charge_arg_for_name              (tree);
6163 extern tree build_cxx_call                      (tree, int, tree *,
6164                                                  tsubst_flags_t);
6165 extern bool is_std_init_list                    (tree);
6166 extern bool is_list_ctor                        (tree);
6167 extern void validate_conversion_obstack         (void);
6168 extern void mark_versions_used                  (tree);
6169 extern bool cp_warn_deprecated_use              (tree, tsubst_flags_t = tf_warning_or_error);
6170 extern tree get_function_version_dispatcher     (tree);
6171
6172 /* in class.c */
6173 extern tree build_vfield_ref                    (tree, tree);
6174 extern tree build_if_in_charge                  (tree true_stmt, tree false_stmt = void_node);
6175 extern tree build_base_path                     (enum tree_code, tree,
6176                                                  tree, int, tsubst_flags_t);
6177 extern tree convert_to_base                     (tree, tree, bool, bool,
6178                                                  tsubst_flags_t);
6179 extern tree convert_to_base_statically          (tree, tree);
6180 extern tree build_vtbl_ref                      (tree, tree);
6181 extern tree build_vfn_ref                       (tree, tree);
6182 extern tree get_vtable_decl                     (tree, int);
6183 extern bool add_method                          (tree, tree, bool);
6184 extern tree declared_access                     (tree);
6185 extern tree currently_open_class                (tree);
6186 extern tree currently_open_derived_class        (tree);
6187 extern tree outermost_open_class                (void);
6188 extern tree current_nonlambda_class_type        (void);
6189 extern tree finish_struct                       (tree, tree);
6190 extern void finish_struct_1                     (tree);
6191 extern int resolves_to_fixed_type_p             (tree, int *);
6192 extern void init_class_processing               (void);
6193 extern int is_empty_class                       (tree);
6194 extern bool is_really_empty_class               (tree);
6195 extern void pushclass                           (tree);
6196 extern void popclass                            (void);
6197 extern void push_nested_class                   (tree);
6198 extern void pop_nested_class                    (void);
6199 extern int current_lang_depth                   (void);
6200 extern void push_lang_context                   (tree);
6201 extern void pop_lang_context                    (void);
6202 extern tree instantiate_type                    (tree, tree, tsubst_flags_t);
6203 extern void build_self_reference                (void);
6204 extern int same_signature_p                     (const_tree, const_tree);
6205 extern void maybe_add_class_template_decl_list  (tree, tree, int);
6206 extern void unreverse_member_declarations       (tree);
6207 extern void invalidate_class_lookup_cache       (void);
6208 extern void maybe_note_name_used_in_class       (tree, tree);
6209 extern void note_name_declared_in_class         (tree, tree);
6210 extern tree get_vtbl_decl_for_binfo             (tree);
6211 extern bool vptr_via_virtual_p                  (tree);
6212 extern void debug_class                         (tree);
6213 extern void debug_thunks                        (tree);
6214 extern void set_linkage_according_to_type       (tree, tree);
6215 extern void determine_key_method                (tree);
6216 extern void check_for_override                  (tree, tree);
6217 extern void push_class_stack                    (void);
6218 extern void pop_class_stack                     (void);
6219 extern bool default_ctor_p                      (tree);
6220 extern bool type_has_user_nondefault_constructor (tree);
6221 extern tree in_class_defaulted_default_constructor (tree);
6222 extern bool user_provided_p                     (tree);
6223 extern bool type_has_user_provided_constructor  (tree);
6224 extern bool type_has_non_user_provided_default_constructor (tree);
6225 extern bool vbase_has_user_provided_move_assign (tree);
6226 extern tree default_init_uninitialized_part (tree);
6227 extern bool trivial_default_constructor_is_constexpr (tree);
6228 extern bool type_has_constexpr_default_constructor (tree);
6229 extern bool type_has_virtual_destructor         (tree);
6230 extern bool classtype_has_move_assign_or_move_ctor_p (tree, bool user_declared);
6231 extern bool classtype_has_non_deleted_move_ctor (tree);
6232 extern tree classtype_has_user_copy_or_dtor     (tree);
6233 extern bool type_build_ctor_call                (tree);
6234 extern bool type_build_dtor_call                (tree);
6235 extern void explain_non_literal_class           (tree);
6236 extern void inherit_targ_abi_tags               (tree);
6237 extern void defaulted_late_check                (tree);
6238 extern bool defaultable_fn_check                (tree);
6239 extern void check_abi_tags                      (tree);
6240 extern tree missing_abi_tags                    (tree);
6241 extern void fixup_type_variants                 (tree);
6242 extern void fixup_attribute_variants            (tree);
6243 extern tree* decl_cloned_function_p             (const_tree, bool);
6244 extern void clone_function_decl                 (tree, bool);
6245 extern void adjust_clone_args                   (tree);
6246 extern void deduce_noexcept_on_destructor       (tree);
6247 extern bool uniquely_derived_from_p             (tree, tree);
6248 extern bool publicly_uniquely_derived_p         (tree, tree);
6249 extern tree common_enclosing_class              (tree, tree);
6250
6251 /* in cvt.c */
6252 extern tree convert_to_reference                (tree, tree, int, int, tree,
6253                                                  tsubst_flags_t);
6254 extern tree convert_from_reference              (tree);
6255 extern tree force_rvalue                        (tree, tsubst_flags_t);
6256 extern tree ocp_convert                         (tree, tree, int, int,
6257                                                  tsubst_flags_t);
6258 extern tree cp_convert                          (tree, tree, tsubst_flags_t);
6259 extern tree cp_convert_and_check                (tree, tree, tsubst_flags_t);
6260 extern tree cp_fold_convert                     (tree, tree);
6261 extern tree cp_get_callee                       (tree);
6262 extern tree cp_get_callee_fndecl                (tree);
6263 extern tree cp_get_callee_fndecl_nofold         (tree);
6264 extern tree cp_get_fndecl_from_callee           (tree, bool fold = true);
6265 extern tree convert_to_void                     (tree, impl_conv_void,
6266                                                  tsubst_flags_t);
6267 extern tree convert_force                       (tree, tree, int,
6268                                                  tsubst_flags_t);
6269 extern tree build_expr_type_conversion          (int, tree, bool);
6270 extern tree type_promotes_to                    (tree);
6271 extern bool can_convert_qual                    (tree, tree);
6272 extern tree perform_qualification_conversions   (tree, tree);
6273 extern bool tx_safe_fn_type_p                   (tree);
6274 extern tree tx_unsafe_fn_variant                (tree);
6275 extern bool fnptr_conv_p                        (tree, tree);
6276 extern tree strip_fnptr_conv                    (tree);
6277
6278 /* in name-lookup.c */
6279 extern void maybe_push_cleanup_level            (tree);
6280 extern tree make_anon_name                      (void);
6281 extern tree maybe_push_decl                     (tree);
6282 extern tree current_decl_namespace              (void);
6283
6284 /* decl.c */
6285 extern tree poplevel                            (int, int, int);
6286 extern void cxx_init_decl_processing            (void);
6287 enum cp_tree_node_structure_enum cp_tree_node_structure
6288                                                 (union lang_tree_node *);
6289 extern void finish_scope                        (void);
6290 extern void push_switch                         (tree);
6291 extern void pop_switch                          (void);
6292 extern void note_break_stmt                     (void);
6293 extern bool note_iteration_stmt_body_start      (void);
6294 extern void note_iteration_stmt_body_end        (bool);
6295 extern tree make_lambda_name                    (void);
6296 extern int decls_match                          (tree, tree, bool = true);
6297 extern bool maybe_version_functions             (tree, tree, bool);
6298 extern tree duplicate_decls                     (tree, tree, bool);
6299 extern tree declare_local_label                 (tree);
6300 extern tree define_label                        (location_t, tree);
6301 extern void check_goto                          (tree);
6302 extern bool check_omp_return                    (void);
6303 extern tree make_typename_type                  (tree, tree, enum tag_types, tsubst_flags_t);
6304 extern tree build_typename_type                 (tree, tree, tree, tag_types);
6305 extern tree make_unbound_class_template         (tree, tree, tree, tsubst_flags_t);
6306 extern tree build_library_fn_ptr                (const char *, tree, int);
6307 extern tree build_cp_library_fn_ptr             (const char *, tree, int);
6308 extern tree push_library_fn                     (tree, tree, tree, int);
6309 extern tree push_void_library_fn                (tree, tree, int);
6310 extern tree push_throw_library_fn               (tree, tree);
6311 extern void warn_misplaced_attr_for_class_type  (source_location location,
6312                                                  tree class_type);
6313 extern tree check_tag_decl                      (cp_decl_specifier_seq *, bool);
6314 extern tree shadow_tag                          (cp_decl_specifier_seq *);
6315 extern tree groktypename                        (cp_decl_specifier_seq *, const cp_declarator *, bool);
6316 extern tree start_decl                          (const cp_declarator *, cp_decl_specifier_seq *, int, tree, tree, tree *);
6317 extern void start_decl_1                        (tree, bool);
6318 extern bool check_array_initializer             (tree, tree, tree);
6319 extern void cp_finish_decl                      (tree, tree, bool, tree, int);
6320 extern tree lookup_decomp_type                  (tree);
6321 extern void cp_maybe_mangle_decomp              (tree, tree, unsigned int);
6322 extern void cp_finish_decomp                    (tree, tree, unsigned int);
6323 extern int cp_complete_array_type               (tree *, tree, bool);
6324 extern int cp_complete_array_type_or_error      (tree *, tree, bool, tsubst_flags_t);
6325 extern tree build_ptrmemfunc_type               (tree);
6326 extern tree build_ptrmem_type                   (tree, tree);
6327 /* the grokdeclarator prototype is in decl.h */
6328 extern tree build_this_parm                     (tree, tree, cp_cv_quals);
6329 extern tree grokparms                           (tree, tree *);
6330 extern int copy_fn_p                            (const_tree);
6331 extern bool move_fn_p                           (const_tree);
6332 extern bool move_signature_fn_p                 (const_tree);
6333 extern tree get_scope_of_declarator             (const cp_declarator *);
6334 extern void grok_special_member_properties      (tree);
6335 extern bool grok_ctor_properties                (const_tree, const_tree);
6336 extern bool grok_op_properties                  (tree, bool);
6337 extern tree xref_tag                            (enum tag_types, tree, tag_scope, bool);
6338 extern tree xref_tag_from_type                  (tree, tree, tag_scope);
6339 extern void xref_basetypes                      (tree, tree);
6340 extern tree start_enum                          (tree, tree, tree, tree, bool, bool *);
6341 extern void finish_enum_value_list              (tree);
6342 extern void finish_enum                         (tree);
6343 extern void build_enumerator                    (tree, tree, tree, tree, location_t);
6344 extern tree lookup_enumerator                   (tree, tree);
6345 extern bool start_preparsed_function            (tree, tree, int);
6346 extern bool start_function                      (cp_decl_specifier_seq *,
6347                                                  const cp_declarator *, tree);
6348 extern tree begin_function_body                 (void);
6349 extern void finish_function_body                (tree);
6350 extern tree outer_curly_brace_block             (tree);
6351 extern tree finish_function                     (bool);
6352 extern tree grokmethod                          (cp_decl_specifier_seq *, const cp_declarator *, tree);
6353 extern void maybe_register_incomplete_var       (tree);
6354 extern void maybe_commonize_var                 (tree);
6355 extern void complete_vars                       (tree);
6356 extern tree static_fn_type                      (tree);
6357 extern void revert_static_member_fn             (tree);
6358 extern void fixup_anonymous_aggr                (tree);
6359 extern tree compute_array_index_type            (tree, tree, tsubst_flags_t);
6360 extern tree check_default_argument              (tree, tree, tsubst_flags_t);
6361 extern int wrapup_namespace_globals             ();
6362 extern tree create_implicit_typedef             (tree, tree);
6363 extern int local_variable_p                     (const_tree);
6364 extern tree register_dtor_fn                    (tree);
6365 extern tmpl_spec_kind current_tmpl_spec_kind    (int);
6366 extern tree cp_fname_init                       (const char *, tree *);
6367 extern tree cxx_builtin_function                (tree decl);
6368 extern tree cxx_builtin_function_ext_scope      (tree decl);
6369 extern tree check_elaborated_type_specifier     (enum tag_types, tree, bool);
6370 extern void warn_extern_redeclared_static       (tree, tree);
6371 extern tree cxx_comdat_group                    (tree);
6372 extern bool cp_missing_noreturn_ok_p            (tree);
6373 extern bool is_direct_enum_init                 (tree, tree);
6374 extern void initialize_artificial_var           (tree, vec<constructor_elt, va_gc> *);
6375 extern tree check_var_type                      (tree, tree);
6376 extern tree reshape_init                        (tree, tree, tsubst_flags_t);
6377 extern tree next_initializable_field (tree);
6378 extern tree fndecl_declared_return_type         (tree);
6379 extern bool undeduced_auto_decl                 (tree);
6380 extern bool require_deduced_type                (tree, tsubst_flags_t = tf_warning_or_error);
6381
6382 extern tree finish_case_label                   (location_t, tree, tree);
6383 extern tree cxx_maybe_build_cleanup             (tree, tsubst_flags_t);
6384 extern bool check_array_designated_initializer  (constructor_elt *,
6385                                                  unsigned HOST_WIDE_INT);
6386 extern bool check_for_uninitialized_const_var   (tree, bool, tsubst_flags_t);
6387 extern tree build_explicit_specifier            (tree, tsubst_flags_t);
6388
6389 /* in decl2.c */
6390 extern void record_mangling                     (tree, bool);
6391 extern void overwrite_mangling                  (tree, tree);
6392 extern void note_mangling_alias                 (tree, tree);
6393 extern void generate_mangling_aliases           (void);
6394 extern tree build_memfn_type                    (tree, tree, cp_cv_quals, cp_ref_qualifier);
6395 extern tree build_pointer_ptrmemfn_type (tree);
6396 extern tree change_return_type                  (tree, tree);
6397 extern void maybe_retrofit_in_chrg              (tree);
6398 extern void maybe_make_one_only                 (tree);
6399 extern bool vague_linkage_p                     (tree);
6400 extern void grokclassfn                         (tree, tree,
6401                                                  enum overload_flags);
6402 extern tree grok_array_decl                     (location_t, tree, tree, bool);
6403 extern tree delete_sanity                       (tree, tree, bool, int, tsubst_flags_t);
6404 extern tree check_classfn                       (tree, tree, tree);
6405 extern void check_member_template               (tree);
6406 extern tree grokfield (const cp_declarator *, cp_decl_specifier_seq *,
6407                        tree, bool, tree, tree);
6408 extern tree grokbitfield (const cp_declarator *, cp_decl_specifier_seq *,
6409                           tree, tree, tree);
6410 extern bool any_dependent_type_attributes_p     (tree);
6411 extern tree cp_reconstruct_complex_type         (tree, tree);
6412 extern bool attributes_naming_typedef_ok        (tree);
6413 extern void cplus_decl_attributes               (tree *, tree, int);
6414 extern void finish_anon_union                   (tree);
6415 extern void cxx_post_compilation_parsing_cleanups (void);
6416 extern tree coerce_new_type                     (tree, location_t);
6417 extern tree coerce_delete_type                  (tree, location_t);
6418 extern void comdat_linkage                      (tree);
6419 extern void determine_visibility                (tree);
6420 extern void constrain_class_visibility          (tree);
6421 extern void reset_type_linkage                  (tree);
6422 extern void tentative_decl_linkage              (tree);
6423 extern void import_export_decl                  (tree);
6424 extern tree build_cleanup                       (tree);
6425 extern tree build_offset_ref_call_from_tree     (tree, vec<tree, va_gc> **,
6426                                                  tsubst_flags_t);
6427 extern bool decl_defined_p                      (tree);
6428 extern bool decl_constant_var_p                 (tree);
6429 extern bool decl_maybe_constant_var_p           (tree);
6430 extern void no_linkage_error                    (tree);
6431 extern void check_default_args                  (tree);
6432 extern bool mark_used                           (tree);
6433 extern bool mark_used                           (tree, tsubst_flags_t);
6434 extern void finish_static_data_member_decl      (tree, tree, bool, tree, int);
6435 extern tree cp_build_parm_decl                  (tree, tree, tree);
6436 extern tree get_guard                           (tree);
6437 extern tree get_guard_cond                      (tree, bool);
6438 extern tree set_guard                           (tree);
6439 extern tree get_tls_wrapper_fn                  (tree);
6440 extern void mark_needed                         (tree);
6441 extern bool decl_needed_p                       (tree);
6442 extern void note_vague_linkage_fn               (tree);
6443 extern void note_variable_template_instantiation (tree);
6444 extern tree build_artificial_parm               (tree, tree, tree);
6445 extern bool possibly_inlined_p                  (tree);
6446 extern int parm_index                           (tree);
6447 extern tree vtv_start_verification_constructor_init_function (void);
6448 extern tree vtv_finish_verification_constructor_init_function (tree);
6449 extern bool cp_omp_mappable_type                (tree);
6450
6451 /* in error.c */
6452 extern const char *type_as_string               (tree, int);
6453 extern const char *type_as_string_translate     (tree, int);
6454 extern const char *decl_as_string               (tree, int);
6455 extern const char *decl_as_string_translate     (tree, int);
6456 extern const char *decl_as_dwarf_string         (tree, int);
6457 extern const char *expr_as_string               (tree, int);
6458 extern const char *expr_to_string               (tree);
6459 extern const char *lang_decl_name               (tree, int, bool);
6460 extern const char *lang_decl_dwarf_name         (tree, int, bool);
6461 extern const char *language_to_string           (enum languages);
6462 extern const char *class_key_or_enum_as_string  (tree);
6463 extern void maybe_warn_variadic_templates       (void);
6464 extern void maybe_warn_cpp0x                    (cpp0x_warn_str str);
6465 extern bool pedwarn_cxx98                       (location_t, int, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
6466 extern location_t location_of                   (tree);
6467 extern void qualified_name_lookup_error         (tree, tree, tree,
6468                                                  location_t);
6469
6470 /* in except.c */
6471 extern void init_exception_processing           (void);
6472 extern tree expand_start_catch_block            (tree);
6473 extern void expand_end_catch_block              (void);
6474 extern tree build_exc_ptr                       (void);
6475 extern tree build_throw                         (tree);
6476 extern int nothrow_libfn_p                      (const_tree);
6477 extern void check_handlers                      (tree);
6478 extern tree finish_noexcept_expr                (tree, tsubst_flags_t);
6479 extern bool expr_noexcept_p                     (tree, tsubst_flags_t);
6480 extern void perform_deferred_noexcept_checks    (void);
6481 extern bool nothrow_spec_p                      (const_tree);
6482 extern bool type_noexcept_p                     (const_tree);
6483 extern bool type_throw_all_p                    (const_tree);
6484 extern tree build_noexcept_spec                 (tree, tsubst_flags_t);
6485 extern void choose_personality_routine          (enum languages);
6486 extern tree build_must_not_throw_expr           (tree,tree);
6487 extern tree eh_type_info                        (tree);
6488 extern tree begin_eh_spec_block                 (void);
6489 extern void finish_eh_spec_block                (tree, tree);
6490 extern tree build_eh_type_type                  (tree);
6491 extern tree cp_protect_cleanup_actions          (void);
6492 extern tree create_try_catch_expr               (tree, tree);
6493
6494 /* in expr.c */
6495 extern tree cplus_expand_constant               (tree);
6496 extern tree mark_use (tree expr, bool rvalue_p, bool read_p,
6497                       location_t = UNKNOWN_LOCATION,
6498                       bool reject_builtin = true);
6499 extern tree mark_rvalue_use                     (tree,
6500                                                  location_t = UNKNOWN_LOCATION,
6501                                                  bool reject_builtin = true);
6502 extern tree mark_lvalue_use                     (tree);
6503 extern tree mark_lvalue_use_nonread             (tree);
6504 extern tree mark_type_use                       (tree);
6505 extern tree mark_discarded_use                  (tree);
6506 extern void mark_exp_read                       (tree);
6507
6508 /* friend.c */
6509 extern int is_friend                            (tree, tree);
6510 extern void make_friend_class                   (tree, tree, bool);
6511 extern void add_friend                          (tree, tree, bool);
6512 extern tree do_friend                           (tree, tree, tree, tree,
6513                                                  enum overload_flags, bool);
6514
6515 extern void set_global_friend                   (tree);
6516 extern bool is_global_friend                    (tree);
6517
6518 /* in init.c */
6519 extern tree expand_member_init                  (tree);
6520 extern void emit_mem_initializers               (tree);
6521 extern tree build_aggr_init                     (tree, tree, int,
6522                                                  tsubst_flags_t);
6523 extern int is_class_type                        (tree, int);
6524 extern tree get_type_value                      (tree);
6525 extern tree build_zero_init                     (tree, tree, bool);
6526 extern tree build_value_init                    (tree, tsubst_flags_t);
6527 extern tree build_value_init_noctor             (tree, tsubst_flags_t);
6528 extern tree get_nsdmi                           (tree, bool, tsubst_flags_t);
6529 extern tree build_offset_ref                    (tree, tree, bool,
6530                                                  tsubst_flags_t);
6531 extern tree throw_bad_array_new_length          (void);
6532 extern bool type_has_new_extended_alignment     (tree);
6533 extern unsigned malloc_alignment                (void);
6534 extern tree build_new                           (vec<tree, va_gc> **, tree, tree,
6535                                                  vec<tree, va_gc> **, int,
6536                                                  tsubst_flags_t);
6537 extern tree get_temp_regvar                     (tree, tree);
6538 extern tree build_vec_init                      (tree, tree, tree, bool, int,
6539                                                  tsubst_flags_t);
6540 extern tree build_delete                        (tree, tree,
6541                                                  special_function_kind,
6542                                                  int, int, tsubst_flags_t);
6543 extern void push_base_cleanups                  (void);
6544 extern tree build_vec_delete                    (tree, tree,
6545                                                  special_function_kind, int,
6546                                                  tsubst_flags_t);
6547 extern tree create_temporary_var                (tree);
6548 extern void initialize_vtbl_ptrs                (tree);
6549 extern tree scalar_constant_value               (tree);
6550 extern tree decl_really_constant_value          (tree);
6551 extern int diagnose_uninitialized_cst_or_ref_member (tree, bool, bool);
6552 extern tree build_vtbl_address                  (tree);
6553 extern bool maybe_reject_flexarray_init         (tree, tree);
6554
6555 /* in lex.c */
6556 extern void cxx_dup_lang_specific_decl          (tree);
6557 extern void yyungetc                            (int, int);
6558
6559 extern tree unqualified_name_lookup_error       (tree,
6560                                                  location_t = UNKNOWN_LOCATION);
6561 extern tree unqualified_fn_lookup_error         (cp_expr);
6562 extern tree make_conv_op_name                   (tree);
6563 extern tree build_lang_decl                     (enum tree_code, tree, tree);
6564 extern tree build_lang_decl_loc                 (location_t, enum tree_code, tree, tree);
6565 extern void retrofit_lang_decl                  (tree);
6566 extern void fit_decomposition_lang_decl         (tree, tree);
6567 extern tree copy_decl                           (tree CXX_MEM_STAT_INFO);
6568 extern tree copy_type                           (tree CXX_MEM_STAT_INFO);
6569 extern tree cxx_make_type                       (enum tree_code CXX_MEM_STAT_INFO);
6570 extern tree make_class_type                     (enum tree_code CXX_MEM_STAT_INFO);
6571 extern const char *get_identifier_kind_name     (tree);
6572 extern void set_identifier_kind                 (tree, cp_identifier_kind);
6573 extern bool cxx_init                            (void);
6574 extern void cxx_finish                          (void);
6575 extern bool in_main_input_context               (void);
6576
6577 /* in method.c */
6578 extern void init_method                         (void);
6579 extern tree make_thunk                          (tree, bool, tree, tree);
6580 extern void finish_thunk                        (tree);
6581 extern void use_thunk                           (tree, bool);
6582 extern bool trivial_fn_p                        (tree);
6583 extern tree forward_parm                        (tree);
6584 extern bool is_trivially_xible                  (enum tree_code, tree, tree);
6585 extern bool is_xible                            (enum tree_code, tree, tree);
6586 extern tree get_defaulted_eh_spec               (tree, tsubst_flags_t = tf_warning_or_error);
6587 extern void after_nsdmi_defaulted_late_checks   (tree);
6588 extern bool maybe_explain_implicit_delete       (tree);
6589 extern void explain_implicit_non_constexpr      (tree);
6590 extern void deduce_inheriting_ctor              (tree);
6591 extern void synthesize_method                   (tree);
6592 extern tree lazily_declare_fn                   (special_function_kind,
6593                                                  tree);
6594 extern tree skip_artificial_parms_for           (const_tree, tree);
6595 extern int num_artificial_parms_for             (const_tree);
6596 extern tree make_alias_for                      (tree, tree);
6597 extern tree get_copy_ctor                       (tree, tsubst_flags_t);
6598 extern tree get_copy_assign                     (tree);
6599 extern tree get_default_ctor                    (tree);
6600 extern tree get_dtor                            (tree, tsubst_flags_t);
6601 extern tree strip_inheriting_ctors              (tree);
6602 extern tree inherited_ctor_binfo                (tree);
6603 extern bool ctor_omit_inherited_parms           (tree);
6604 extern tree locate_ctor                         (tree);
6605 extern tree implicitly_declare_fn               (special_function_kind, tree,
6606                                                  bool, tree, tree);
6607
6608 /* In optimize.c */
6609 extern bool maybe_clone_body                    (tree);
6610
6611 /* In parser.c */
6612 extern tree cp_convert_range_for (tree, tree, tree, tree, unsigned int, bool,
6613                                   unsigned short);
6614 extern bool parsing_nsdmi (void);
6615 extern bool parsing_default_capturing_generic_lambda_in_template (void);
6616 extern void inject_this_parameter (tree, cp_cv_quals);
6617 extern location_t defarg_location (tree);
6618 extern void maybe_show_extern_c_location (void);
6619 extern bool literal_integer_zerop (const_tree);
6620
6621 /* in pt.c */
6622 extern bool check_template_shadow               (tree);
6623 extern bool check_auto_in_tmpl_args             (tree, tree);
6624 extern tree get_innermost_template_args         (tree, int);
6625 extern void maybe_begin_member_template_processing (tree);
6626 extern void maybe_end_member_template_processing (void);
6627 extern tree finish_member_template_decl         (tree);
6628 extern void begin_template_parm_list            (void);
6629 extern bool begin_specialization                (void);
6630 extern void reset_specialization                (void);
6631 extern void end_specialization                  (void);
6632 extern void begin_explicit_instantiation        (void);
6633 extern void end_explicit_instantiation          (void);
6634 extern void check_unqualified_spec_or_inst      (tree, location_t);
6635 extern tree check_explicit_specialization       (tree, tree, int, int,
6636                                                  tree = NULL_TREE);
6637 extern int num_template_headers_for_class       (tree);
6638 extern void check_template_variable             (tree);
6639 extern tree make_auto                           (void);
6640 extern tree make_decltype_auto                  (void);
6641 extern tree make_template_placeholder           (tree);
6642 extern bool template_placeholder_p              (tree);
6643 extern tree do_auto_deduction                   (tree, tree, tree,
6644                                                  tsubst_flags_t
6645                                                  = tf_warning_or_error,
6646                                                  auto_deduction_context
6647                                                  = adc_unspecified,
6648                                                  tree = NULL_TREE,
6649                                                  int = LOOKUP_NORMAL);
6650 extern tree type_uses_auto                      (tree);
6651 extern tree type_uses_auto_or_concept           (tree);
6652 extern void append_type_to_template_for_access_check (tree, tree, tree,
6653                                                       location_t);
6654 extern tree convert_generic_types_to_packs      (tree, int, int);
6655 extern tree splice_late_return_type             (tree, tree);
6656 extern bool is_auto                             (const_tree);
6657 extern tree process_template_parm               (tree, location_t, tree,
6658                                                  bool, bool);
6659 extern tree end_template_parm_list              (tree);
6660 extern void end_template_parm_list              (void);
6661 extern void end_template_decl                   (void);
6662 extern tree maybe_update_decl_type              (tree, tree);
6663 extern bool check_default_tmpl_args             (tree, tree, bool, bool, int);
6664 extern tree push_template_decl                  (tree);
6665 extern tree push_template_decl_real             (tree, bool);
6666 extern tree add_inherited_template_parms        (tree, tree);
6667 extern bool redeclare_class_template            (tree, tree, tree);
6668 extern tree lookup_template_class               (tree, tree, tree, tree,
6669                                                  int, tsubst_flags_t);
6670 extern tree lookup_template_function            (tree, tree);
6671 extern tree lookup_template_variable            (tree, tree);
6672 extern int uses_template_parms                  (tree);
6673 extern bool uses_template_parms_level           (tree, int);
6674 extern bool in_template_function                (void);
6675 extern bool need_generic_capture                (void);
6676 extern tree instantiate_class_template          (tree);
6677 extern tree instantiate_template                (tree, tree, tsubst_flags_t);
6678 extern tree fn_type_unification                 (tree, tree, tree,
6679                                                  const tree *, unsigned int,
6680                                                  tree, unification_kind_t, int,
6681                                                  struct conversion **,
6682                                                  bool, bool);
6683 extern void mark_decl_instantiated              (tree, int);
6684 extern int more_specialized_fn                  (tree, tree, int);
6685 extern void do_decl_instantiation               (tree, tree);
6686 extern void do_type_instantiation               (tree, tree, tsubst_flags_t);
6687 extern bool always_instantiate_p                (tree);
6688 extern bool maybe_instantiate_noexcept          (tree, tsubst_flags_t = tf_warning_or_error);
6689 extern tree instantiate_decl                    (tree, bool, bool);
6690 extern int comp_template_parms                  (const_tree, const_tree);
6691 extern bool builtin_pack_fn_p                   (tree);
6692 extern bool uses_parameter_packs                (tree);
6693 extern bool template_parameter_pack_p           (const_tree);
6694 extern bool function_parameter_pack_p           (const_tree);
6695 extern bool function_parameter_expanded_from_pack_p (tree, tree);
6696 extern tree make_pack_expansion                 (tree, tsubst_flags_t = tf_warning_or_error);
6697 extern bool check_for_bare_parameter_packs      (tree, location_t = UNKNOWN_LOCATION);
6698 extern tree build_template_info                 (tree, tree);
6699 extern tree get_template_info                   (const_tree);
6700 extern vec<qualified_typedef_usage_t, va_gc> *get_types_needing_access_check (tree);
6701 extern int template_class_depth                 (tree);
6702 extern int is_specialization_of                 (tree, tree);
6703 extern bool is_specialization_of_friend         (tree, tree);
6704 extern tree get_pattern_parm                    (tree, tree);
6705 extern int comp_template_args                   (tree, tree, tree * = NULL,
6706                                                  tree * = NULL, bool = false);
6707 extern int template_args_equal                  (tree, tree, bool = false);
6708 extern tree maybe_process_partial_specialization (tree);
6709 extern tree most_specialized_instantiation      (tree);
6710 extern void print_candidates                    (tree);
6711 extern void instantiate_pending_templates       (int);
6712 extern tree tsubst_default_argument             (tree, int, tree, tree,
6713                                                  tsubst_flags_t);
6714 extern tree tsubst (tree, tree, tsubst_flags_t, tree);
6715 extern tree tsubst_copy_and_build               (tree, tree, tsubst_flags_t,
6716                                                  tree, bool, bool);
6717 extern tree tsubst_expr                         (tree, tree, tsubst_flags_t,
6718                                                  tree, bool);
6719 extern tree tsubst_pack_expansion               (tree, tree, tsubst_flags_t, tree);
6720 extern tree most_general_template               (tree);
6721 extern tree get_mostly_instantiated_function_type (tree);
6722 extern bool problematic_instantiation_changed   (void);
6723 extern void record_last_problematic_instantiation (void);
6724 extern struct tinst_level *current_instantiation(void);
6725 extern bool instantiating_current_function_p    (void);
6726 extern tree maybe_get_template_decl_from_type_decl (tree);
6727 extern int processing_template_parmlist;
6728 extern bool dependent_type_p                    (tree);
6729 extern bool dependent_scope_p                   (tree);
6730 extern bool any_dependent_template_arguments_p  (const_tree);
6731 extern bool any_erroneous_template_args_p       (const_tree);
6732 extern bool dependent_template_p                (tree);
6733 extern bool dependent_template_id_p             (tree, tree);
6734 extern bool type_dependent_expression_p         (tree);
6735 extern bool type_dependent_object_expression_p  (tree);
6736 extern bool any_type_dependent_arguments_p      (const vec<tree, va_gc> *);
6737 extern bool any_type_dependent_elements_p       (const_tree);
6738 extern bool type_dependent_expression_p_push    (tree);
6739 extern bool value_dependent_expression_p        (tree);
6740 extern bool instantiation_dependent_expression_p (tree);
6741 extern bool instantiation_dependent_uneval_expression_p (tree);
6742 extern bool any_value_dependent_elements_p      (const_tree);
6743 extern bool dependent_omp_for_p                 (tree, tree, tree, tree);
6744 extern tree resolve_typename_type               (tree, bool);
6745 extern tree template_for_substitution           (tree);
6746 extern tree build_non_dependent_expr            (tree);
6747 extern void make_args_non_dependent             (vec<tree, va_gc> *);
6748 extern bool reregister_specialization           (tree, tree, tree);
6749 extern tree instantiate_non_dependent_expr      (tree);
6750 extern tree instantiate_non_dependent_expr_sfinae (tree, tsubst_flags_t);
6751 extern tree instantiate_non_dependent_expr_internal (tree, tsubst_flags_t);
6752 extern tree instantiate_non_dependent_or_null   (tree);
6753 extern bool variable_template_specialization_p  (tree);
6754 extern bool alias_type_or_template_p            (tree);
6755 extern bool alias_template_specialization_p     (const_tree);
6756 extern bool dependent_alias_template_spec_p     (const_tree);
6757 extern bool explicit_class_specialization_p     (tree);
6758 extern bool push_tinst_level                    (tree);
6759 extern bool push_tinst_level_loc                (tree, location_t);
6760 extern void pop_tinst_level                     (void);
6761 extern struct tinst_level *outermost_tinst_level(void);
6762 extern void init_template_processing            (void);
6763 extern void print_template_statistics           (void);
6764 bool template_template_parameter_p              (const_tree);
6765 bool template_type_parameter_p                  (const_tree);
6766 extern bool primary_template_specialization_p   (const_tree);
6767 extern tree get_primary_template_innermost_parameters   (const_tree);
6768 extern tree get_template_parms_at_level (tree, int);
6769 extern tree get_template_innermost_arguments    (const_tree);
6770 extern tree get_template_argument_pack_elems    (const_tree);
6771 extern tree get_function_template_decl          (const_tree);
6772 extern tree resolve_nondeduced_context          (tree, tsubst_flags_t);
6773 extern hashval_t iterative_hash_template_arg (tree arg, hashval_t val);
6774 extern tree coerce_template_parms               (tree, tree, tree);
6775 extern tree coerce_template_parms               (tree, tree, tree, tsubst_flags_t);
6776 extern void register_local_specialization       (tree, tree);
6777 extern tree retrieve_local_specialization       (tree);
6778 extern tree extract_fnparm_pack                 (tree, tree *);
6779 extern tree template_parm_to_arg                (tree);
6780 extern tree dguide_name                         (tree);
6781 extern bool dguide_name_p                       (tree);
6782 extern bool deduction_guide_p                   (const_tree);
6783 extern bool copy_guide_p                        (const_tree);
6784 extern bool template_guide_p                    (const_tree);
6785 extern void store_explicit_specifier            (tree, tree);
6786
6787 /* in repo.c */
6788 extern void init_repo                           (void);
6789 extern int repo_emit_p                          (tree);
6790 extern bool repo_export_class_p                 (const_tree);
6791 extern void finish_repo                         (void);
6792
6793 /* in rtti.c */
6794 /* A vector of all tinfo decls that haven't been emitted yet.  */
6795 extern GTY(()) vec<tree, va_gc> *unemitted_tinfo_decls;
6796
6797 extern void init_rtti_processing                (void);
6798 extern tree build_typeid                        (tree, tsubst_flags_t);
6799 extern tree get_tinfo_decl                      (tree);
6800 extern tree get_typeid                          (tree, tsubst_flags_t);
6801 extern tree build_headof                        (tree);
6802 extern tree build_dynamic_cast                  (tree, tree, tsubst_flags_t);
6803 extern void emit_support_tinfos                 (void);
6804 extern bool emit_tinfo_decl                     (tree);
6805
6806 /* in search.c */
6807 extern bool accessible_base_p                   (tree, tree, bool);
6808 extern tree lookup_base                         (tree, tree, base_access,
6809                                                  base_kind *, tsubst_flags_t);
6810 extern tree dcast_base_hint                     (tree, tree);
6811 extern int accessible_p                         (tree, tree, bool);
6812 extern int accessible_in_template_p             (tree, tree);
6813 extern tree lookup_field                        (tree, tree, int, bool);
6814 extern tree lookup_fnfields                     (tree, tree, int);
6815 extern tree lookup_member                       (tree, tree, int, bool,
6816                                                  tsubst_flags_t,
6817                                                  access_failure_info *afi = NULL);
6818 extern tree lookup_member_fuzzy         (tree, tree, bool);
6819 extern tree locate_field_accessor               (tree, tree, bool);
6820 extern int look_for_overrides                   (tree, tree);
6821 extern void get_pure_virtuals                   (tree);
6822 extern void maybe_suppress_debug_info           (tree);
6823 extern void note_debug_info_needed              (tree);
6824 extern tree current_scope                       (void);
6825 extern int at_function_scope_p                  (void);
6826 extern bool at_class_scope_p                    (void);
6827 extern bool at_namespace_scope_p                (void);
6828 extern tree context_for_name_lookup             (tree);
6829 extern tree lookup_conversions                  (tree);
6830 extern tree binfo_from_vbase                    (tree);
6831 extern tree binfo_for_vbase                     (tree, tree);
6832 extern tree look_for_overrides_here             (tree, tree);
6833 #define dfs_skip_bases ((tree)1)
6834 extern tree dfs_walk_all (tree, tree (*) (tree, void *),
6835                           tree (*) (tree, void *), void *);
6836 extern tree dfs_walk_once (tree, tree (*) (tree, void *),
6837                            tree (*) (tree, void *), void *);
6838 extern tree binfo_via_virtual                   (tree, tree);
6839 extern bool binfo_direct_p                      (tree);
6840 extern tree build_baselink                      (tree, tree, tree, tree);
6841 extern tree adjust_result_of_qualified_name_lookup
6842                                                 (tree, tree, tree);
6843 extern tree copied_binfo                        (tree, tree);
6844 extern tree original_binfo                      (tree, tree);
6845 extern int shared_member_p                      (tree);
6846 extern bool any_dependent_bases_p (tree = current_nonlambda_class_type ());
6847
6848 /* The representation of a deferred access check.  */
6849
6850 struct GTY(()) deferred_access_check {
6851   /* The base class in which the declaration is referenced. */
6852   tree binfo;
6853   /* The declaration whose access must be checked.  */
6854   tree decl;
6855   /* The declaration that should be used in the error message.  */
6856   tree diag_decl;
6857   /* The location of this access.  */
6858   location_t loc;
6859 };
6860
6861 /* in semantics.c */
6862 extern void push_deferring_access_checks        (deferring_kind);
6863 extern void resume_deferring_access_checks      (void);
6864 extern void stop_deferring_access_checks        (void);
6865 extern void pop_deferring_access_checks         (void);
6866 extern vec<deferred_access_check, va_gc> *get_deferred_access_checks (void);
6867 extern void reopen_deferring_access_checks (vec<deferred_access_check, va_gc> *);
6868 extern void pop_to_parent_deferring_access_checks (void);
6869 extern bool perform_access_checks (vec<deferred_access_check, va_gc> *,
6870                                    tsubst_flags_t);
6871 extern bool perform_deferred_access_checks      (tsubst_flags_t);
6872 extern bool perform_or_defer_access_check       (tree, tree, tree,
6873                                                  tsubst_flags_t,
6874                                                  access_failure_info *afi = NULL);
6875
6876 /* RAII sentinel to ensures that deferred access checks are popped before
6877   a function returns.  */
6878
6879 struct deferring_access_check_sentinel
6880 {
6881   deferring_access_check_sentinel (enum deferring_kind kind = dk_deferred)
6882   {
6883     push_deferring_access_checks (kind);
6884   }
6885   ~deferring_access_check_sentinel ()
6886   {
6887     pop_deferring_access_checks ();
6888   }
6889 };
6890
6891 extern int stmts_are_full_exprs_p               (void);
6892 extern void init_cp_semantics                   (void);
6893 extern tree do_poplevel                         (tree);
6894 extern void break_maybe_infinite_loop           (void);
6895 extern void add_decl_expr                       (tree);
6896 extern tree maybe_cleanup_point_expr_void       (tree);
6897 extern tree finish_expr_stmt                    (tree);
6898 extern tree begin_if_stmt                       (void);
6899 extern tree finish_if_stmt_cond                 (tree, tree);
6900 extern tree finish_then_clause                  (tree);
6901 extern void begin_else_clause                   (tree);
6902 extern void finish_else_clause                  (tree);
6903 extern void finish_if_stmt                      (tree);
6904 extern tree begin_while_stmt                    (void);
6905 extern void finish_while_stmt_cond      (tree, tree, bool, unsigned short);
6906 extern void finish_while_stmt                   (tree);
6907 extern tree begin_do_stmt                       (void);
6908 extern void finish_do_body                      (tree);
6909 extern void finish_do_stmt              (tree, tree, bool, unsigned short);
6910 extern tree finish_return_stmt                  (tree);
6911 extern tree begin_for_scope                     (tree *);
6912 extern tree begin_for_stmt                      (tree, tree);
6913 extern void finish_init_stmt                    (tree);
6914 extern void finish_for_cond             (tree, tree, bool, unsigned short);
6915 extern void finish_for_expr                     (tree, tree);
6916 extern void finish_for_stmt                     (tree);
6917 extern tree begin_range_for_stmt                (tree, tree);
6918 extern void finish_range_for_decl               (tree, tree, tree);
6919 extern void finish_range_for_stmt               (tree);
6920 extern tree finish_break_stmt                   (void);
6921 extern tree finish_continue_stmt                (void);
6922 extern tree begin_switch_stmt                   (void);
6923 extern void finish_switch_cond                  (tree, tree);
6924 extern void finish_switch_stmt                  (tree);
6925 extern tree finish_goto_stmt                    (tree);
6926 extern tree begin_try_block                     (void);
6927 extern void finish_try_block                    (tree);
6928 extern void finish_handler_sequence             (tree);
6929 extern tree begin_function_try_block            (tree *);
6930 extern void finish_function_try_block           (tree);
6931 extern void finish_function_handler_sequence    (tree, tree);
6932 extern void finish_cleanup_try_block            (tree);
6933 extern tree begin_handler                       (void);
6934 extern void finish_handler_parms                (tree, tree);
6935 extern void finish_handler                      (tree);
6936 extern void finish_cleanup                      (tree, tree);
6937 extern bool is_this_parameter                   (tree);
6938
6939 enum {
6940   BCS_NORMAL = 0,
6941   BCS_NO_SCOPE = 1,
6942   BCS_TRY_BLOCK = 2,
6943   BCS_FN_BODY = 4,
6944   BCS_TRANSACTION = 8
6945 };
6946 extern tree begin_compound_stmt                 (unsigned int);
6947
6948 extern void finish_compound_stmt                (tree);
6949 extern tree finish_asm_stmt                     (int, tree, tree, tree, tree,
6950                                                  tree);
6951 extern tree finish_label_stmt                   (tree);
6952 extern void finish_label_decl                   (tree);
6953 extern cp_expr finish_parenthesized_expr        (cp_expr);
6954 extern tree force_paren_expr                    (tree);
6955 extern tree maybe_undo_parenthesized_ref        (tree);
6956 extern tree maybe_strip_ref_conversion          (tree);
6957 extern tree finish_non_static_data_member       (tree, tree, tree);
6958 extern tree begin_stmt_expr                     (void);
6959 extern tree finish_stmt_expr_expr               (tree, tree);
6960 extern tree finish_stmt_expr                    (tree, bool);
6961 extern tree stmt_expr_value_expr                (tree);
6962 bool empty_expr_stmt_p                          (tree);
6963 extern cp_expr perform_koenig_lookup            (cp_expr, vec<tree, va_gc> *,
6964                                                  tsubst_flags_t);
6965 extern tree finish_call_expr                    (tree, vec<tree, va_gc> **, bool,
6966                                                  bool, tsubst_flags_t);
6967 extern tree lookup_and_finish_template_variable (tree, tree, tsubst_flags_t = tf_warning_or_error);
6968 extern tree finish_template_variable            (tree, tsubst_flags_t = tf_warning_or_error);
6969 extern cp_expr finish_increment_expr            (cp_expr, enum tree_code);
6970 extern tree finish_this_expr                    (void);
6971 extern tree finish_pseudo_destructor_expr       (tree, tree, tree, location_t);
6972 extern cp_expr finish_unary_op_expr             (location_t, enum tree_code, cp_expr,
6973                                                  tsubst_flags_t);
6974 /* Whether this call to finish_compound_literal represents a C++11 functional
6975    cast or a C99 compound literal.  */
6976 enum fcl_t { fcl_functional, fcl_c99 };
6977 extern tree finish_compound_literal             (tree, tree, tsubst_flags_t, fcl_t = fcl_functional);
6978 extern tree finish_fname                        (tree);
6979 extern void finish_translation_unit             (void);
6980 extern tree finish_template_type_parm           (tree, tree);
6981 extern tree finish_template_template_parm       (tree, tree);
6982 extern tree begin_class_definition              (tree);
6983 extern void finish_template_decl                (tree);
6984 extern tree finish_template_type                (tree, tree, int);
6985 extern tree finish_base_specifier               (tree, tree, bool);
6986 extern void finish_member_declaration           (tree);
6987 extern bool outer_automatic_var_p               (tree);
6988 extern tree process_outer_var_ref               (tree, tsubst_flags_t, bool force_use = false);
6989 extern cp_expr finish_id_expression             (tree, tree, tree,
6990                                                  cp_id_kind *,
6991                                                  bool, bool, bool *,
6992                                                  bool, bool, bool, bool,
6993                                                  const char **,
6994                                                  location_t);
6995 extern tree finish_typeof                       (tree);
6996 extern tree finish_underlying_type              (tree);
6997 extern tree calculate_bases                     (tree, tsubst_flags_t);
6998 extern tree finish_bases                        (tree, bool);
6999 extern tree calculate_direct_bases              (tree, tsubst_flags_t);
7000 extern tree finish_offsetof                     (tree, tree, location_t);
7001 extern void finish_decl_cleanup                 (tree, tree);
7002 extern void finish_eh_cleanup                   (tree);
7003 extern void emit_associated_thunks              (tree);
7004 extern void finish_mem_initializers             (tree);
7005 extern tree check_template_template_default_arg (tree);
7006 extern bool expand_or_defer_fn_1                (tree);
7007 extern void expand_or_defer_fn                  (tree);
7008 extern void add_typedef_to_current_template_for_access_check (tree, tree,
7009                                                               location_t);
7010 extern void check_accessibility_of_qualified_id (tree, tree, tree);
7011 extern tree finish_qualified_id_expr            (tree, tree, bool, bool,
7012                                                  bool, bool, tsubst_flags_t);
7013 extern void simplify_aggr_init_expr             (tree *);
7014 extern void finalize_nrv                        (tree *, tree, tree);
7015 extern tree omp_reduction_id                    (enum tree_code, tree, tree);
7016 extern tree cp_remove_omp_priv_cleanup_stmt     (tree *, int *, void *);
7017 extern void cp_check_omp_declare_reduction      (tree);
7018 extern void finish_omp_declare_simd_methods     (tree);
7019 extern tree finish_omp_clauses                  (tree, enum c_omp_region_type);
7020 extern tree push_omp_privatization_clauses      (bool);
7021 extern void pop_omp_privatization_clauses       (tree);
7022 extern void save_omp_privatization_clauses      (vec<tree> &);
7023 extern void restore_omp_privatization_clauses   (vec<tree> &);
7024 extern void finish_omp_threadprivate            (tree);
7025 extern tree begin_omp_structured_block          (void);
7026 extern tree finish_omp_structured_block         (tree);
7027 extern tree finish_oacc_data                    (tree, tree);
7028 extern tree finish_oacc_host_data               (tree, tree);
7029 extern tree finish_omp_construct                (enum tree_code, tree, tree);
7030 extern tree begin_omp_parallel                  (void);
7031 extern tree finish_omp_parallel                 (tree, tree);
7032 extern tree begin_omp_task                      (void);
7033 extern tree finish_omp_task                     (tree, tree);
7034 extern tree finish_omp_for                      (location_t, enum tree_code,
7035                                                  tree, tree, tree, tree, tree,
7036                                                  tree, tree, vec<tree> *, tree);
7037 extern void finish_omp_atomic                   (enum tree_code, enum tree_code,
7038                                                  tree, tree, tree, tree, tree,
7039                                                  bool);
7040 extern void finish_omp_barrier                  (void);
7041 extern void finish_omp_flush                    (void);
7042 extern void finish_omp_taskwait                 (void);
7043 extern void finish_omp_taskyield                (void);
7044 extern void finish_omp_cancel                   (tree);
7045 extern void finish_omp_cancellation_point       (tree);
7046 extern tree omp_privatize_field                 (tree, bool);
7047 extern tree begin_transaction_stmt              (location_t, tree *, int);
7048 extern void finish_transaction_stmt             (tree, tree, int, tree);
7049 extern tree build_transaction_expr              (location_t, tree, int, tree);
7050 extern bool cxx_omp_create_clause_info          (tree, tree, bool, bool,
7051                                                  bool, bool);
7052 extern tree baselink_for_fns                    (tree);
7053 extern void finish_static_assert                (tree, tree, location_t,
7054                                                  bool);
7055 extern tree finish_decltype_type                (tree, bool, tsubst_flags_t);
7056 extern tree finish_trait_expr                   (enum cp_trait_kind, tree, tree);
7057 extern tree build_lambda_expr                   (void);
7058 extern tree build_lambda_object                 (tree);
7059 extern tree begin_lambda_type                   (tree);
7060 extern tree lambda_capture_field_type           (tree, bool, bool);
7061 extern tree lambda_return_type                  (tree);
7062 extern tree lambda_proxy_type                   (tree);
7063 extern tree lambda_function                     (tree);
7064 extern void apply_deduced_return_type           (tree, tree);
7065 extern tree add_capture                         (tree, tree, tree, bool, bool);
7066 extern tree add_default_capture                 (tree, tree, tree);
7067 extern void insert_capture_proxy                (tree);
7068 extern void insert_pending_capture_proxies      (void);
7069 extern bool is_capture_proxy                    (tree);
7070 extern bool is_normal_capture_proxy             (tree);
7071 extern bool is_constant_capture_proxy           (tree);
7072 extern void register_capture_members            (tree);
7073 extern tree lambda_expr_this_capture            (tree, bool);
7074 extern void maybe_generic_this_capture          (tree, tree);
7075 extern tree maybe_resolve_dummy                 (tree, bool);
7076 extern tree current_nonlambda_function          (void);
7077 extern tree nonlambda_method_basetype           (void);
7078 extern tree current_nonlambda_scope             (void);
7079 extern tree current_lambda_expr                 (void);
7080 extern bool generic_lambda_fn_p                 (tree);
7081 extern tree do_dependent_capture                (tree, bool = false);
7082 extern bool lambda_fn_in_template_p             (tree);
7083 extern void maybe_add_lambda_conv_op            (tree);
7084 extern bool is_lambda_ignored_entity            (tree);
7085 extern bool lambda_static_thunk_p               (tree);
7086 extern tree finish_builtin_launder              (location_t, tree,
7087                                                  tsubst_flags_t);
7088 extern void start_lambda_scope                  (tree);
7089 extern void record_lambda_scope                 (tree);
7090 extern void record_null_lambda_scope            (tree);
7091 extern void finish_lambda_scope                 (void);
7092 extern tree start_lambda_function               (tree fn, tree lambda_expr);
7093 extern void finish_lambda_function              (tree body);
7094
7095 /* in tree.c */
7096 extern int cp_tree_operand_length               (const_tree);
7097 extern int cp_tree_code_length                  (enum tree_code);
7098 extern void cp_free_lang_data                   (tree t);
7099 extern tree force_target_expr                   (tree, tree, tsubst_flags_t);
7100 extern tree build_target_expr_with_type         (tree, tree, tsubst_flags_t);
7101 extern void lang_check_failed                   (const char *, int,
7102                                                  const char *) ATTRIBUTE_NORETURN
7103                                                  ATTRIBUTE_COLD;
7104 extern tree stabilize_expr                      (tree, tree *);
7105 extern void stabilize_call                      (tree, tree *);
7106 extern bool stabilize_init                      (tree, tree *);
7107 extern tree add_stmt_to_compound                (tree, tree);
7108 extern void init_tree                           (void);
7109 extern bool pod_type_p                          (const_tree);
7110 extern bool layout_pod_type_p                   (const_tree);
7111 extern bool std_layout_type_p                   (const_tree);
7112 extern bool trivial_type_p                      (const_tree);
7113 extern bool trivially_copyable_p                (const_tree);
7114 extern bool type_has_unique_obj_representations (const_tree);
7115 extern bool scalarish_type_p                    (const_tree);
7116 extern bool type_has_nontrivial_default_init    (const_tree);
7117 extern bool type_has_nontrivial_copy_init       (const_tree);
7118 extern void maybe_warn_parm_abi                 (tree, location_t);
7119 extern bool class_tmpl_impl_spec_p              (const_tree);
7120 extern int zero_init_p                          (const_tree);
7121 extern bool check_abi_tag_redeclaration         (const_tree, const_tree,
7122                                                  const_tree);
7123 extern bool check_abi_tag_args                  (tree, tree);
7124 extern tree strip_typedefs                      (tree, bool * = NULL);
7125 extern tree strip_typedefs_expr                 (tree, bool * = NULL);
7126 extern tree copy_binfo                          (tree, tree, tree,
7127                                                  tree *, int);
7128 extern int member_p                             (const_tree);
7129 extern cp_lvalue_kind real_lvalue_p             (const_tree);
7130 extern cp_lvalue_kind lvalue_kind               (const_tree);
7131 extern bool glvalue_p                           (const_tree);
7132 extern bool obvalue_p                           (const_tree);
7133 extern bool xvalue_p                            (const_tree);
7134 extern bool bitfield_p                          (const_tree);
7135 extern tree cp_stabilize_reference              (tree);
7136 extern bool builtin_valid_in_constant_expr_p    (const_tree);
7137 extern tree build_min                           (enum tree_code, tree, ...);
7138 extern tree build_min_nt_loc                    (location_t, enum tree_code,
7139                                                  ...);
7140 extern tree build_min_non_dep                   (enum tree_code, tree, ...);
7141 extern tree build_min_non_dep_op_overload       (enum tree_code, tree, tree, ...);
7142 extern tree build_min_nt_call_vec (tree, vec<tree, va_gc> *);
7143 extern tree build_min_non_dep_call_vec          (tree, tree, vec<tree, va_gc> *);
7144 extern vec<tree, va_gc>* vec_copy_and_insert    (vec<tree, va_gc>*, tree, unsigned);
7145 extern tree build_cplus_new                     (tree, tree, tsubst_flags_t);
7146 extern tree build_aggr_init_expr                (tree, tree);
7147 extern tree get_target_expr                     (tree);
7148 extern tree get_target_expr_sfinae              (tree, tsubst_flags_t);
7149 extern tree build_cplus_array_type              (tree, tree);
7150 extern tree build_array_of_n_type               (tree, int);
7151 extern bool array_of_runtime_bound_p            (tree);
7152 extern bool vla_type_p                          (tree);
7153 extern tree build_array_copy                    (tree);
7154 extern tree build_vec_init_expr                 (tree, tree, tsubst_flags_t);
7155 extern void diagnose_non_constexpr_vec_init     (tree);
7156 extern tree hash_tree_cons                      (tree, tree, tree);
7157 extern tree hash_tree_chain                     (tree, tree);
7158 extern tree build_qualified_name                (tree, tree, tree, bool);
7159 extern tree build_ref_qualified_type            (tree, cp_ref_qualifier);
7160 inline tree ovl_first                           (tree) ATTRIBUTE_PURE;
7161 extern tree ovl_make                            (tree fn,
7162                                                  tree next = NULL_TREE);
7163 extern tree ovl_insert                          (tree fn, tree maybe_ovl,
7164                                                  bool using_p = false);
7165 extern tree ovl_skip_hidden                     (tree) ATTRIBUTE_PURE;
7166 extern void lookup_mark                         (tree lookup, bool val);
7167 extern tree lookup_add                          (tree fns, tree lookup);
7168 extern tree lookup_maybe_add                    (tree fns, tree lookup,
7169                                                  bool deduping);
7170 extern void lookup_keep                         (tree lookup);
7171 extern int is_overloaded_fn                     (tree) ATTRIBUTE_PURE;
7172 extern bool really_overloaded_fn                (tree) ATTRIBUTE_PURE;
7173 extern tree dependent_name                      (tree);
7174 extern tree maybe_get_fns                       (tree) ATTRIBUTE_PURE;
7175 extern tree get_fns                             (tree) ATTRIBUTE_PURE;
7176 extern tree get_first_fn                        (tree) ATTRIBUTE_PURE;
7177 extern tree ovl_scope                           (tree);
7178 extern const char *cxx_printable_name           (tree, int);
7179 extern const char *cxx_printable_name_translate (tree, int);
7180 extern tree canonical_eh_spec                   (tree);
7181 extern tree build_cp_fntype_variant             (tree, cp_ref_qualifier, tree, bool);
7182 extern tree build_exception_variant             (tree, tree);
7183 extern tree bind_template_template_parm         (tree, tree);
7184 extern tree array_type_nelts_total              (tree);
7185 extern tree array_type_nelts_top                (tree);
7186 extern tree break_out_target_exprs              (tree, bool = false);
7187 extern tree build_ctor_subob_ref                (tree, tree, tree);
7188 extern tree replace_placeholders                (tree, tree, bool * = NULL);
7189 extern bool find_placeholders                   (tree);
7190 extern tree get_type_decl                       (tree);
7191 extern tree decl_namespace_context              (tree);
7192 extern bool decl_anon_ns_mem_p                  (const_tree);
7193 extern tree lvalue_type                         (tree);
7194 extern tree error_type                          (tree);
7195 extern int varargs_function_p                   (const_tree);
7196 extern bool cp_tree_equal                       (tree, tree);
7197 extern tree no_linkage_check                    (tree, bool);
7198 extern void debug_binfo                         (tree);
7199 extern tree build_dummy_object                  (tree);
7200 extern tree maybe_dummy_object                  (tree, tree *);
7201 extern int is_dummy_object                      (const_tree);
7202 extern const struct attribute_spec cxx_attribute_table[];
7203 extern tree make_ptrmem_cst                     (tree, tree);
7204 extern tree cp_build_type_attribute_variant     (tree, tree);
7205 extern tree cp_build_reference_type             (tree, bool);
7206 extern tree move                                (tree);
7207 extern tree cp_build_qualified_type_real        (tree, int, tsubst_flags_t);
7208 #define cp_build_qualified_type(TYPE, QUALS) \
7209   cp_build_qualified_type_real ((TYPE), (QUALS), tf_warning_or_error)
7210 extern bool cv_qualified_p                      (const_tree);
7211 extern tree cv_unqualified                      (tree);
7212 extern special_function_kind special_function_p (const_tree);
7213 extern int count_trees                          (tree);
7214 extern int char_type_p                          (tree);
7215 extern void verify_stmt_tree                    (tree);
7216 extern linkage_kind decl_linkage                (tree);
7217 extern duration_kind decl_storage_duration      (tree);
7218 extern tree cp_walk_subtrees (tree*, int*, walk_tree_fn,
7219                               void*, hash_set<tree> *);
7220 #define cp_walk_tree(tp,func,data,pset) \
7221         walk_tree_1 (tp, func, data, pset, cp_walk_subtrees)
7222 #define cp_walk_tree_without_duplicates(tp,func,data) \
7223         walk_tree_without_duplicates_1 (tp, func, data, cp_walk_subtrees)
7224 extern tree rvalue                              (tree);
7225 extern tree convert_bitfield_to_declared_type   (tree);
7226 extern tree cp_save_expr                        (tree);
7227 extern bool cast_valid_in_integral_constant_expression_p (tree);
7228 extern bool cxx_type_hash_eq                    (const_tree, const_tree);
7229 extern tree cxx_copy_lang_qualifiers            (const_tree, const_tree);
7230
7231 extern void cxx_print_statistics                (void);
7232 extern bool maybe_warn_zero_as_null_pointer_constant (tree, location_t);
7233
7234 /* in ptree.c */
7235 extern void cxx_print_xnode                     (FILE *, tree, int);
7236 extern void cxx_print_decl                      (FILE *, tree, int);
7237 extern void cxx_print_type                      (FILE *, tree, int);
7238 extern void cxx_print_identifier                (FILE *, tree, int);
7239 extern void cxx_print_error_function            (diagnostic_context *,
7240                                                  const char *,
7241                                                  struct diagnostic_info *);
7242
7243 /* in typeck.c */
7244 extern bool cxx_mark_addressable                (tree, bool = false);
7245 extern int string_conv_p                        (const_tree, const_tree, int);
7246 extern tree cp_truthvalue_conversion            (tree);
7247 extern tree condition_conversion                (tree);
7248 extern tree require_complete_type               (tree);
7249 extern tree require_complete_type_sfinae        (tree, tsubst_flags_t);
7250 extern tree complete_type                       (tree);
7251 extern tree complete_type_or_else               (tree, tree);
7252 extern tree complete_type_or_maybe_complain     (tree, tree, tsubst_flags_t);
7253 inline bool type_unknown_p                      (const_tree);
7254 enum { ce_derived, ce_type, ce_normal, ce_exact };
7255 extern bool comp_except_specs                   (const_tree, const_tree, int);
7256 extern bool comptypes                           (tree, tree, int);
7257 extern bool same_type_ignoring_top_level_qualifiers_p (tree, tree);
7258 extern bool compparms                           (const_tree, const_tree);
7259 extern int comp_cv_qualification                (const_tree, const_tree);
7260 extern int comp_cv_qualification                (int, int);
7261 extern int comp_cv_qual_signature               (tree, tree);
7262 extern tree cxx_sizeof_or_alignof_expr          (tree, enum tree_code, bool);
7263 extern tree cxx_sizeof_or_alignof_type          (tree, enum tree_code, bool, bool);
7264 extern tree cxx_alignas_expr                    (tree);
7265 extern tree cxx_sizeof_nowarn                   (tree);
7266 extern tree is_bitfield_expr_with_lowered_type  (const_tree);
7267 extern tree unlowered_expr_type                 (const_tree);
7268 extern tree decay_conversion                    (tree,
7269                                                  tsubst_flags_t,
7270                                                  bool = true);
7271 extern tree build_class_member_access_expr      (cp_expr, tree, tree, bool,
7272                                                  tsubst_flags_t);
7273 extern tree finish_class_member_access_expr     (cp_expr, tree, bool,
7274                                                  tsubst_flags_t);
7275 extern tree build_x_indirect_ref                (location_t, tree,
7276                                                  ref_operator, tsubst_flags_t);
7277 extern tree cp_build_indirect_ref               (tree, ref_operator,
7278                                                  tsubst_flags_t);
7279 extern tree cp_build_fold_indirect_ref          (tree);
7280 extern tree build_array_ref                     (location_t, tree, tree);
7281 extern tree cp_build_array_ref                  (location_t, tree, tree,
7282                                                  tsubst_flags_t);
7283 extern tree get_member_function_from_ptrfunc    (tree *, tree, tsubst_flags_t);
7284 extern tree cp_build_function_call_nary         (tree, tsubst_flags_t, ...)
7285                                                 ATTRIBUTE_SENTINEL;
7286 extern tree cp_build_function_call_vec          (tree, vec<tree, va_gc> **,
7287                                                  tsubst_flags_t);
7288 extern tree build_x_binary_op                   (location_t,
7289                                                  enum tree_code, tree,
7290                                                  enum tree_code, tree,
7291                                                  enum tree_code, tree *,
7292                                                  tsubst_flags_t);
7293 extern tree build_x_array_ref                   (location_t, tree, tree,
7294                                                  tsubst_flags_t);
7295 extern tree build_x_unary_op                    (location_t,
7296                                                  enum tree_code, cp_expr,
7297                                                  tsubst_flags_t);
7298 extern tree cp_build_addressof                  (location_t, tree,
7299                                                  tsubst_flags_t);
7300 extern tree cp_build_addr_expr                  (tree, tsubst_flags_t);
7301 extern tree cp_build_unary_op                   (enum tree_code, tree, bool,
7302                                                  tsubst_flags_t);
7303 extern tree genericize_compound_lvalue          (tree);
7304 extern tree unary_complex_lvalue                (enum tree_code, tree);
7305 extern tree build_x_conditional_expr            (location_t, tree, tree, tree,
7306                                                  tsubst_flags_t);
7307 extern tree build_x_compound_expr_from_list     (tree, expr_list_kind,
7308                                                  tsubst_flags_t);
7309 extern tree build_x_compound_expr_from_vec      (vec<tree, va_gc> *,
7310                                                  const char *, tsubst_flags_t);
7311 extern tree build_x_compound_expr               (location_t, tree, tree,
7312                                                  tsubst_flags_t);
7313 extern tree build_compound_expr                 (location_t, tree, tree);
7314 extern tree cp_build_compound_expr              (tree, tree, tsubst_flags_t);
7315 extern tree build_static_cast                   (tree, tree, tsubst_flags_t);
7316 extern tree build_reinterpret_cast              (tree, tree, tsubst_flags_t);
7317 extern tree build_const_cast                    (tree, tree, tsubst_flags_t);
7318 extern tree build_c_cast                        (location_t, tree, tree);
7319 extern cp_expr build_c_cast                     (location_t loc, tree type,
7320                                                  cp_expr expr);
7321 extern tree cp_build_c_cast                     (tree, tree, tsubst_flags_t);
7322 extern cp_expr build_x_modify_expr              (location_t, tree,
7323                                                  enum tree_code, tree,
7324                                                  tsubst_flags_t);
7325 extern tree cp_build_modify_expr                (location_t, tree,
7326                                                  enum tree_code, tree,
7327                                                  tsubst_flags_t);
7328 extern tree convert_for_initialization          (tree, tree, tree, int,
7329                                                  impl_conv_rhs, tree, int,
7330                                                  tsubst_flags_t);
7331 extern int comp_ptr_ttypes                      (tree, tree);
7332 extern bool comp_ptr_ttypes_const               (tree, tree);
7333 extern bool error_type_p                        (const_tree);
7334 extern bool ptr_reasonably_similar              (const_tree, const_tree);
7335 extern tree build_ptrmemfunc                    (tree, tree, int, bool,
7336                                                  tsubst_flags_t);
7337 extern int cp_type_quals                        (const_tree);
7338 extern int type_memfn_quals                     (const_tree);
7339 extern cp_ref_qualifier type_memfn_rqual        (const_tree);
7340 extern tree apply_memfn_quals                   (tree, cp_cv_quals,
7341                                                  cp_ref_qualifier = REF_QUAL_NONE);
7342 extern bool cp_has_mutable_p                    (const_tree);
7343 extern bool at_least_as_qualified_p             (const_tree, const_tree);
7344 extern void cp_apply_type_quals_to_decl         (int, tree);
7345 extern tree build_ptrmemfunc1                   (tree, tree, tree);
7346 extern void expand_ptrmemfunc_cst               (tree, tree *, tree *);
7347 extern tree type_after_usual_arithmetic_conversions (tree, tree);
7348 extern tree common_pointer_type                 (tree, tree);
7349 extern tree composite_pointer_type              (tree, tree, tree, tree,
7350                                                  composite_pointer_operation,
7351                                                  tsubst_flags_t);
7352 extern tree merge_types                         (tree, tree);
7353 extern tree strip_array_domain                  (tree);
7354 extern tree check_return_expr                   (tree, bool *);
7355 extern tree cp_build_binary_op                  (location_t,
7356                                                  enum tree_code, tree, tree,
7357                                                  tsubst_flags_t);
7358 extern tree build_x_vec_perm_expr               (location_t,
7359                                                  tree, tree, tree,
7360                                                  tsubst_flags_t);
7361 #define cxx_sizeof(T)  cxx_sizeof_or_alignof_type (T, SIZEOF_EXPR, false, true)
7362 extern tree build_simple_component_ref          (tree, tree);
7363 extern tree build_ptrmemfunc_access_expr        (tree, tree);
7364 extern tree build_address                       (tree);
7365 extern tree build_nop                           (tree, tree);
7366 extern tree non_reference                       (tree);
7367 extern tree lookup_anon_field                   (tree, tree);
7368 extern bool invalid_nonstatic_memfn_p           (location_t, tree,
7369                                                  tsubst_flags_t);
7370 extern tree convert_member_func_to_ptr          (tree, tree, tsubst_flags_t);
7371 extern tree convert_ptrmem                      (tree, tree, bool, bool,
7372                                                  tsubst_flags_t);
7373 extern int lvalue_or_else                       (tree, enum lvalue_use,
7374                                                  tsubst_flags_t);
7375 extern void check_template_keyword              (tree);
7376 extern bool check_raw_literal_operator          (const_tree decl);
7377 extern bool check_literal_operator_args         (const_tree, bool *, bool *);
7378 extern void maybe_warn_about_useless_cast       (tree, tree, tsubst_flags_t);
7379 extern tree cp_perform_integral_promotions      (tree, tsubst_flags_t);
7380
7381 extern tree finish_left_unary_fold_expr      (tree, int);
7382 extern tree finish_right_unary_fold_expr     (tree, int);
7383 extern tree finish_binary_fold_expr          (tree, tree, int);
7384 extern bool treat_lvalue_as_rvalue_p         (tree, bool);
7385
7386 /* in typeck2.c */
7387 extern void require_complete_eh_spec_types      (tree, tree);
7388 extern void cxx_incomplete_type_diagnostic      (location_t, const_tree,
7389                                                  const_tree, diagnostic_t);
7390
7391 inline location_t
7392 cp_expr_loc_or_loc (const_tree t, location_t or_loc)
7393 {
7394   location_t loc = cp_expr_location (t);
7395   if (loc == UNKNOWN_LOCATION)
7396     loc = or_loc;
7397   return loc;
7398 }
7399
7400 inline void
7401 cxx_incomplete_type_diagnostic (const_tree value, const_tree type,
7402                                 diagnostic_t diag_kind)
7403 {
7404   cxx_incomplete_type_diagnostic (cp_expr_loc_or_loc (value, input_location),
7405                                   value, type, diag_kind);
7406 }
7407
7408 extern void cxx_incomplete_type_error           (location_t, const_tree,
7409                                                  const_tree);
7410 inline void
7411 cxx_incomplete_type_error (const_tree value, const_tree type)
7412 {
7413   cxx_incomplete_type_diagnostic (value, type, DK_ERROR);
7414 }
7415
7416 extern void cxx_incomplete_type_inform          (const_tree);
7417 extern tree error_not_base_type                 (tree, tree);
7418 extern tree binfo_or_else                       (tree, tree);
7419 extern void cxx_readonly_error                  (location_t, tree,
7420                                                  enum lvalue_use);
7421 extern void complete_type_check_abstract        (tree);
7422 extern int abstract_virtuals_error              (tree, tree);
7423 extern int abstract_virtuals_error              (abstract_class_use, tree);
7424 extern int abstract_virtuals_error_sfinae       (tree, tree, tsubst_flags_t);
7425 extern int abstract_virtuals_error_sfinae       (abstract_class_use, tree, tsubst_flags_t);
7426
7427 extern tree store_init_value                    (tree, tree, vec<tree, va_gc>**, int);
7428 extern tree split_nonconstant_init              (tree, tree);
7429 extern bool check_narrowing                     (tree, tree, tsubst_flags_t,
7430                                                  bool = false);
7431 extern tree digest_init                         (tree, tree, tsubst_flags_t);
7432 extern tree digest_init_flags                   (tree, tree, int, tsubst_flags_t);
7433 extern tree digest_nsdmi_init                   (tree, tree, tsubst_flags_t);
7434 extern tree build_scoped_ref                    (tree, tree, tree *);
7435 extern tree build_x_arrow                       (location_t, tree,
7436                                                  tsubst_flags_t);
7437 extern tree build_m_component_ref               (tree, tree, tsubst_flags_t);
7438 extern tree build_functional_cast               (tree, tree, tsubst_flags_t);
7439 extern tree add_exception_specifier             (tree, tree, tsubst_flags_t);
7440 extern tree merge_exception_specifiers          (tree, tree);
7441
7442 /* in mangle.c */
7443 extern void init_mangle                         (void);
7444 extern void mangle_decl                         (tree);
7445 extern const char *mangle_type_string           (tree);
7446 extern tree mangle_typeinfo_for_type            (tree);
7447 extern tree mangle_typeinfo_string_for_type     (tree);
7448 extern tree mangle_vtbl_for_type                (tree);
7449 extern tree mangle_vtt_for_type                 (tree);
7450 extern tree mangle_ctor_vtbl_for_type           (tree, tree);
7451 extern tree mangle_thunk                        (tree, int, tree, tree, tree);
7452 extern tree mangle_guard_variable               (tree);
7453 extern tree mangle_tls_init_fn                  (tree);
7454 extern tree mangle_tls_wrapper_fn               (tree);
7455 extern bool decl_tls_wrapper_p                  (tree);
7456 extern tree mangle_ref_init_variable            (tree);
7457 extern char * get_mangled_vtable_map_var_name   (tree);
7458 extern bool mangle_return_type_p                (tree);
7459 extern tree mangle_decomp                       (tree, vec<tree> &);
7460
7461 /* in dump.c */
7462 extern bool cp_dump_tree                        (void *, tree);
7463
7464 /* In cp/cp-objcp-common.c.  */
7465
7466 extern alias_set_type cxx_get_alias_set         (tree);
7467 extern bool cxx_warn_unused_global_decl         (const_tree);
7468 extern size_t cp_tree_size                      (enum tree_code);
7469 extern bool cp_var_mod_type_p                   (tree, tree);
7470 extern void cxx_initialize_diagnostics          (diagnostic_context *);
7471 extern int cxx_types_compatible_p               (tree, tree);
7472 extern bool cxx_block_may_fallthru              (const_tree);
7473
7474 /* in cp-gimplify.c */
7475 extern int cp_gimplify_expr                     (tree *, gimple_seq *,
7476                                                  gimple_seq *);
7477 extern void cp_genericize                       (tree);
7478 extern bool cxx_omp_const_qual_no_mutable       (tree);
7479 extern enum omp_clause_default_kind cxx_omp_predetermined_sharing_1 (tree);
7480 extern enum omp_clause_default_kind cxx_omp_predetermined_sharing (tree);
7481 extern tree cxx_omp_clause_default_ctor         (tree, tree, tree);
7482 extern tree cxx_omp_clause_copy_ctor            (tree, tree, tree);
7483 extern tree cxx_omp_clause_assign_op            (tree, tree, tree);
7484 extern tree cxx_omp_clause_dtor                 (tree, tree);
7485 extern void cxx_omp_finish_clause               (tree, gimple_seq *);
7486 extern bool cxx_omp_privatize_by_reference      (const_tree);
7487 extern bool cxx_omp_disregard_value_expr        (tree, bool);
7488 extern void cp_fold_function                    (tree);
7489 extern tree cp_fully_fold                       (tree);
7490 extern void clear_fold_cache                    (void);
7491
7492 /* in name-lookup.c */
7493 extern tree strip_using_decl                    (tree);
7494
7495 /* Tell the binding oracle what kind of binding we are looking for.  */
7496
7497 enum cp_oracle_request
7498 {
7499   CP_ORACLE_IDENTIFIER
7500 };
7501
7502 /* If this is non-NULL, then it is a "binding oracle" which can lazily
7503    create bindings when needed by the C compiler.  The oracle is told
7504    the name and type of the binding to create.  It can call pushdecl
7505    or the like to ensure the binding is visible; or do nothing,
7506    leaving the binding untouched.  c-decl.c takes note of when the
7507    oracle has been called and will not call it again if it fails to
7508    create a given binding.  */
7509
7510 typedef void cp_binding_oracle_function (enum cp_oracle_request, tree identifier);
7511
7512 extern cp_binding_oracle_function *cp_binding_oracle;
7513
7514 /* in constraint.cc */
7515 extern void init_constraint_processing          ();
7516 extern bool constraint_p                        (tree);
7517 extern tree conjoin_constraints                 (tree, tree);
7518 extern tree conjoin_constraints                 (tree);
7519 extern tree get_constraints                     (tree);
7520 extern void set_constraints                     (tree, tree);
7521 extern void remove_constraints                  (tree);
7522 extern tree current_template_constraints        (void);
7523 extern tree associate_classtype_constraints     (tree);
7524 extern tree build_constraints                   (tree, tree);
7525 extern tree get_shorthand_constraints           (tree);
7526 extern tree build_concept_check                 (tree, tree, tree = NULL_TREE);
7527 extern tree build_constrained_parameter         (tree, tree, tree = NULL_TREE);
7528 extern tree make_constrained_auto               (tree, tree);
7529 extern void placeholder_extract_concept_and_args (tree, tree&, tree&);
7530 extern bool equivalent_placeholder_constraints  (tree, tree);
7531 extern hashval_t hash_placeholder_constraint    (tree);
7532 extern bool deduce_constrained_parameter        (tree, tree&, tree&);
7533 extern tree resolve_constraint_check            (tree);
7534 extern tree check_function_concept              (tree);
7535 extern tree finish_template_introduction        (tree, tree);
7536 extern bool valid_requirements_p                (tree);
7537 extern tree finish_concept_name                 (tree);
7538 extern tree finish_shorthand_constraint         (tree, tree);
7539 extern tree finish_requires_expr                (tree, tree);
7540 extern tree finish_simple_requirement           (tree);
7541 extern tree finish_type_requirement             (tree);
7542 extern tree finish_compound_requirement         (tree, tree, bool);
7543 extern tree finish_nested_requirement           (tree);
7544 extern void check_constrained_friend            (tree, tree);
7545 extern tree tsubst_requires_expr                (tree, tree, tsubst_flags_t, tree);
7546 extern tree tsubst_constraint                   (tree, tree, tsubst_flags_t, tree);
7547 extern tree tsubst_constraint_info              (tree, tree, tsubst_flags_t, tree);
7548 extern bool function_concept_check_p            (tree);
7549 extern tree normalize_expression                (tree);
7550 extern tree expand_concept                      (tree, tree);
7551 extern bool expanding_concept                   ();
7552 extern tree evaluate_constraints                (tree, tree);
7553 extern tree evaluate_function_concept           (tree, tree);
7554 extern tree evaluate_variable_concept           (tree, tree);
7555 extern tree evaluate_constraint_expression      (tree, tree);
7556 extern bool constraints_satisfied_p             (tree);
7557 extern bool constraints_satisfied_p             (tree, tree);
7558 extern tree lookup_constraint_satisfaction      (tree, tree);
7559 extern tree memoize_constraint_satisfaction     (tree, tree, tree);
7560 extern tree lookup_concept_satisfaction         (tree, tree);
7561 extern tree memoize_concept_satisfaction        (tree, tree, tree);
7562 extern tree get_concept_expansion               (tree, tree);
7563 extern tree save_concept_expansion              (tree, tree, tree);
7564 extern bool* lookup_subsumption_result          (tree, tree);
7565 extern bool save_subsumption_result             (tree, tree, bool);
7566
7567 extern bool equivalent_constraints              (tree, tree);
7568 extern bool equivalently_constrained            (tree, tree);
7569 extern bool subsumes_constraints                (tree, tree);
7570 extern bool strictly_subsumes                   (tree, tree);
7571 extern int more_constrained                     (tree, tree);
7572
7573 extern void diagnose_constraints                (location_t, tree, tree);
7574
7575 /* in logic.cc */
7576 extern tree decompose_conclusions               (tree);
7577 extern bool subsumes                            (tree, tree);
7578
7579 /* In class.c */
7580 extern void cp_finish_injected_record_type (tree);
7581
7582 /* in vtable-class-hierarchy.c */
7583 extern void vtv_compute_class_hierarchy_transitive_closure (void);
7584 extern void vtv_generate_init_routine           (void);
7585 extern void vtv_save_class_info                 (tree);
7586 extern void vtv_recover_class_info              (void);
7587 extern void vtv_build_vtable_verify_fndecl      (void);
7588
7589 /* In constexpr.c */
7590 extern void fini_constexpr                      (void);
7591 extern bool literal_type_p                      (tree);
7592 extern tree register_constexpr_fundef           (tree, tree);
7593 extern bool is_valid_constexpr_fn               (tree, bool);
7594 extern bool check_constexpr_ctor_body           (tree, tree, bool);
7595 extern tree constexpr_fn_retval         (tree);
7596 extern tree ensure_literal_type_for_constexpr_object (tree);
7597 extern bool potential_constant_expression       (tree);
7598 extern bool is_constant_expression (tree);
7599 extern bool is_nondependent_constant_expression (tree);
7600 extern bool is_nondependent_static_init_expression (tree);
7601 extern bool is_static_init_expression    (tree);
7602 extern bool potential_rvalue_constant_expression (tree);
7603 extern bool require_potential_constant_expression (tree);
7604 extern bool require_constant_expression (tree);
7605 extern bool require_rvalue_constant_expression (tree);
7606 extern bool require_potential_rvalue_constant_expression (tree);
7607 extern tree cxx_constant_value                  (tree, tree = NULL_TREE);
7608 extern tree cxx_constant_init                   (tree, tree = NULL_TREE);
7609 extern tree maybe_constant_value                (tree, tree = NULL_TREE);
7610 extern tree maybe_constant_init                 (tree, tree = NULL_TREE, bool = false);
7611 extern tree fold_non_dependent_expr             (tree, tsubst_flags_t = tf_warning_or_error);
7612 extern tree fold_simple                         (tree);
7613 extern bool is_sub_constant_expr                (tree);
7614 extern bool reduced_constant_expression_p       (tree);
7615 extern bool is_instantiation_of_constexpr       (tree);
7616 extern bool var_in_constexpr_fn                 (tree);
7617 extern bool var_in_maybe_constexpr_fn           (tree);
7618 extern void explain_invalid_constexpr_fn        (tree);
7619 extern vec<tree> cx_error_context               (void);
7620 extern tree fold_sizeof_expr                    (tree);
7621 extern void clear_cv_and_fold_caches            (void);
7622
7623 /* In cp-ubsan.c */
7624 extern void cp_ubsan_maybe_instrument_member_call (tree);
7625 extern void cp_ubsan_instrument_member_accesses (tree *);
7626 extern tree cp_ubsan_maybe_instrument_downcast  (location_t, tree, tree, tree);
7627 extern tree cp_ubsan_maybe_instrument_cast_to_vbase (location_t, tree, tree);
7628 extern void cp_ubsan_maybe_initialize_vtbl_ptrs (tree);
7629
7630 /* Inline bodies.  */
7631
7632 inline tree
7633 ovl_first (tree node)
7634 {
7635   while (TREE_CODE (node) == OVERLOAD)
7636     node = OVL_FUNCTION (node);
7637   return node;
7638 }
7639
7640 inline bool
7641 type_unknown_p (const_tree expr)
7642 {
7643   return TREE_TYPE (expr) == unknown_type_node;
7644 }
7645
7646 inline hashval_t
7647 named_decl_hash::hash (const value_type decl)
7648 {
7649   tree name = OVL_NAME (decl);
7650   return name ? IDENTIFIER_HASH_VALUE (name) : 0;
7651 }
7652
7653 inline bool
7654 named_decl_hash::equal (const value_type existing, compare_type candidate)
7655 {
7656   tree name = OVL_NAME (existing);
7657   return candidate == name;
7658 }
7659
7660 inline bool
7661 null_node_p (const_tree expr)
7662 {
7663   STRIP_ANY_LOCATION_WRAPPER (expr);
7664   return expr == null_node;
7665 }
7666
7667 #if CHECKING_P
7668 namespace selftest {
7669   extern void run_cp_tests (void);
7670
7671   /* Declarations for specific families of tests within cp,
7672      by source file, in alphabetical order.  */
7673   extern void cp_pt_c_tests ();
7674   extern void cp_tree_c_tests (void);
7675 } // namespace selftest
7676 #endif /* #if CHECKING_P */
7677
7678 /* -- end of C++ */
7679
7680 #endif /* ! GCC_CP_TREE_H */