cp-tree.h (TYPE_REF_P): New.

2018-05-14  Paolo Carlini  <paolo.carlini@oracle.com>

	* cp-tree.h (TYPE_REF_P): New.
	(TYPE_OBJ_P, TYPE_REF_OBJ_P, TYPE_REFFN_P): Update.
	* call.c (build_list_conv, build_aggr_conv, standard_conversion,
	direct_reference_binding, reference_binding, implicit_conversion,
	add_builtin_candidate, build_user_type_conversion_1, build_op_call_1,
	build_new_op_1, build_x_va_arg, conv_binds_ref_to_prvalue,
	build_over_call, perform_implicit_conversion_flags,
	extend_ref_init_temps, type_has_extended_temps): Use it.
	* class.c (one_inheriting_sig, check_field_decls,
	check_bases_and_members, find_flexarrays, finish_struct,
	fixed_type_or_null): Likewise.
	* constexpr.c (literal_type_p, cxx_bind_parameters_in_call,
	non_const_var_error, cxx_eval_constant_expression,
	potential_constant_expression_1): Likewise.
	* cp-gimplify.c (omp_var_to_track, omp_cxx_notice_variable,
	cp_genericize_r, cxx_omp_privatize_by_reference,
	cxx_omp_const_qual_no_mutable, cxx_omp_finish_clause,
	cp_fold_maybe_rvalue): Likewise.
	* cp-ubsan.c (cp_ubsan_maybe_instrument_downcast): Likewise.
	* cvt.c (build_up_reference, convert_to_reference,
	convert_from_reference, convert_to_void, noexcept_conv_p,
	fnptr_conv_p): Likewise.
	* decl.c (poplevel, check_for_uninitialized_const_var,
	check_initializer, initialize_local_var, cp_finish_decl,
	get_tuple_decomp_init, cp_finish_decomp, grokdeclarator, copy_fn_p,
	move_signature_fn_p, grok_op_properties, finish_function): Likewise.
	* decl2.c (grok_array_decl, cp_reconstruct_complex_type,
	decl_maybe_constant_var_p): Likewise.
	* error.c (dump_type_prefix, dump_expr): Likewise.
	* except.c (initialize_handler_parm, complete_ptr_ref_or_void_ptr_p,
	is_admissible_throw_operand_or_catch_parameter): Likewise.
	* expr.c (mark_use): Likewise.
	* init.c (build_zero_init_1, build_value_init_noctor,
	perform_member_init, diagnose_uninitialized_cst_or_ref_member_1,
	build_new, build_delete): Likewise.
	* lambda.c (build_lambda_object): Likewise.
	* mangle.c (write_expression, write_template_arg): Likewise.
	* method.c (forward_parm, do_build_copy_constructor,
	do_build_copy_assign, build_stub_object, constructible_expr,
	walk_field_subobs): Likewise.
	* parser.c (cp_parser_omp_for_loop_init,
	cp_parser_omp_declare_reduction_exprs,
	cp_parser_omp_declare_reduction): Likewise.
	* pt.c (convert_nontype_argument_function, convert_nontype_argument,
	convert_template_argument, tsubst_pack_expansion,
	tsubst_function_decl, tsubst_decl, tsubst, tsubst_copy_and_build,
	maybe_adjust_types_for_deduction, check_cv_quals_for_unify, unify,
	more_specialized_fn, invalid_nontype_parm_type_p, dependent_type_p_r,
	value_dependent_expression_p, build_deduction_guide): Likewise.
	* semantics.c (finish_handler_parms, finish_non_static_data_member,
	finish_compound_literal, omp_privatize_field,
	handle_omp_array_sections_1, handle_omp_array_sections,
	cp_check_omp_declare_reduction, finish_omp_reduction_clause,
	finish_omp_declare_simd_methods, cp_finish_omp_clause_depend_sink,
	finish_omp_clauses, finish_decltype_type, capture_decltype,
	finish_builtin_launder): Likewise.
	* tree.c (lvalue_kind, cp_build_reference_type, move,
	cp_build_qualified_type_real, stabilize_expr, stabilize_init): Likewise.
	* typeck.c (cxx_safe_arg_type_equiv_p, build_class_member_access_expr,
	cp_build_indirect_ref_1, convert_arguments, warn_for_null_address,
	cp_build_addr_expr_1, maybe_warn_about_useless_cast,
	build_static_cast_1, build_static_cast, build_reinterpret_cast_1,
	build_const_cast_1, cp_build_c_cast, cp_build_modify_expr,
	convert_for_initialization,
	maybe_warn_about_returning_address_of_local, check_return_expr,
	cp_type_quals, casts_away_constness, non_reference): Likewise.
	* typeck2.c (cxx_readonly_error, store_init_value,
	process_init_constructor_record, build_x_arrow, build_functional_cast,
	add_exception_specifier): Likewise.

From-SVN: r260228

23 files changed, 312 insertions, 241 deletions

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 7450598..c421471 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,75 @@
+2018-05-14  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* cp-tree.h (TYPE_REF_P): New.
+	(TYPE_OBJ_P, TYPE_REF_OBJ_P, TYPE_REFFN_P): Update.
+	* call.c (build_list_conv, build_aggr_conv, standard_conversion,
+	direct_reference_binding, reference_binding, implicit_conversion,
+	add_builtin_candidate, build_user_type_conversion_1, build_op_call_1,
+	build_new_op_1, build_x_va_arg, conv_binds_ref_to_prvalue,
+	build_over_call, perform_implicit_conversion_flags,
+	extend_ref_init_temps, type_has_extended_temps): Use it.
+	* class.c (one_inheriting_sig, check_field_decls,
+	check_bases_and_members, find_flexarrays, finish_struct,
+	fixed_type_or_null): Likewise.
+	* constexpr.c (literal_type_p, cxx_bind_parameters_in_call,
+	non_const_var_error, cxx_eval_constant_expression,
+	potential_constant_expression_1): Likewise.
+	* cp-gimplify.c (omp_var_to_track, omp_cxx_notice_variable,
+	cp_genericize_r, cxx_omp_privatize_by_reference,
+	cxx_omp_const_qual_no_mutable, cxx_omp_finish_clause,
+	cp_fold_maybe_rvalue): Likewise.
+	* cp-ubsan.c (cp_ubsan_maybe_instrument_downcast): Likewise.
+	* cvt.c (build_up_reference, convert_to_reference,
+	convert_from_reference, convert_to_void, noexcept_conv_p,
+	fnptr_conv_p): Likewise.
+	* decl.c (poplevel, check_for_uninitialized_const_var,
+	check_initializer, initialize_local_var, cp_finish_decl,
+	get_tuple_decomp_init, cp_finish_decomp, grokdeclarator, copy_fn_p,
+	move_signature_fn_p, grok_op_properties, finish_function): Likewise.
+	* decl2.c (grok_array_decl, cp_reconstruct_complex_type,
+	decl_maybe_constant_var_p): Likewise.
+	* error.c (dump_type_prefix, dump_expr): Likewise.
+	* except.c (initialize_handler_parm, complete_ptr_ref_or_void_ptr_p,
+	is_admissible_throw_operand_or_catch_parameter): Likewise.
+	* expr.c (mark_use): Likewise.
+	* init.c (build_zero_init_1, build_value_init_noctor,
+	perform_member_init, diagnose_uninitialized_cst_or_ref_member_1,
+	build_new, build_delete): Likewise.
+	* lambda.c (build_lambda_object): Likewise.
+	* mangle.c (write_expression, write_template_arg): Likewise.
+	* method.c (forward_parm, do_build_copy_constructor,
+	do_build_copy_assign, build_stub_object, constructible_expr,
+	walk_field_subobs): Likewise.
+	* parser.c (cp_parser_omp_for_loop_init,
+	cp_parser_omp_declare_reduction_exprs,
+	cp_parser_omp_declare_reduction): Likewise.
+	* pt.c (convert_nontype_argument_function, convert_nontype_argument,
+	convert_template_argument, tsubst_pack_expansion,
+	tsubst_function_decl, tsubst_decl, tsubst, tsubst_copy_and_build,
+	maybe_adjust_types_for_deduction, check_cv_quals_for_unify, unify,
+	more_specialized_fn, invalid_nontype_parm_type_p, dependent_type_p_r,
+	value_dependent_expression_p, build_deduction_guide): Likewise.
+	* semantics.c (finish_handler_parms, finish_non_static_data_member,
+	finish_compound_literal, omp_privatize_field,
+	handle_omp_array_sections_1, handle_omp_array_sections,
+	cp_check_omp_declare_reduction, finish_omp_reduction_clause,
+	finish_omp_declare_simd_methods, cp_finish_omp_clause_depend_sink,
+	finish_omp_clauses, finish_decltype_type, capture_decltype,
+	finish_builtin_launder): Likewise.
+	* tree.c (lvalue_kind, cp_build_reference_type, move,
+	cp_build_qualified_type_real, stabilize_expr, stabilize_init): Likewise.
+	* typeck.c (cxx_safe_arg_type_equiv_p, build_class_member_access_expr,
+	cp_build_indirect_ref_1, convert_arguments, warn_for_null_address,
+	cp_build_addr_expr_1, maybe_warn_about_useless_cast,
+	build_static_cast_1, build_static_cast, build_reinterpret_cast_1,
+	build_const_cast_1, cp_build_c_cast, cp_build_modify_expr,
+	convert_for_initialization,
+	maybe_warn_about_returning_address_of_local, check_return_expr,
+	cp_type_quals, casts_away_constness, non_reference): Likewise.
+	* typeck2.c (cxx_readonly_error, store_init_value,
+	process_init_constructor_record, build_x_arrow, build_functional_cast,
+	add_exception_specifier): Likewise.
+
 2018-05-14  Jason Merrill  <jason@redhat.com>
 
 	* pt.c (tsubst) [ARRAY_TYPE]: Check valid_array_size_p.
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 30fe682..f620c0d 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -814,7 +814,7 @@ build_list_conv (tree type, tree ctor, int flags, tsubst_flags_t complain)
   flags |= LOOKUP_NO_NARROWING;
 
   /* Can't make an array of these types.  */
-  if (TREE_CODE (elttype) == REFERENCE_TYPE
+  if (TYPE_REF_P (elttype)
       || TREE_CODE (elttype) == FUNCTION_TYPE
       || VOID_TYPE_P (elttype))
     return NULL;
@@ -915,7 +915,7 @@ build_aggr_conv (tree type, tree ctor, int flags, tsubst_flags_t complain)
 	val = CONSTRUCTOR_ELT (ctor, i)->value;
       else if (DECL_INITIAL (field))
 	val = get_nsdmi (field, /*ctor*/false, complain);
-      else if (TREE_CODE (ftype) == REFERENCE_TYPE)
+      else if (TYPE_REF_P (ftype))
 	/* Value-initialization of reference is ill-formed.  */
 	return NULL;
       else
@@ -1105,7 +1105,7 @@ standard_conversion (tree to, tree from, tree expr, bool c_cast_p,
   tree qualified_to;
 
   to = non_reference (to);
-  if (TREE_CODE (from) == REFERENCE_TYPE)
+  if (TYPE_REF_P (from))
     {
       fromref = true;
       from = TREE_TYPE (from);
@@ -1475,8 +1475,8 @@ direct_reference_binding (tree type, conversion *conv)
 {
   tree t;
 
-  gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
-  gcc_assert (TREE_CODE (conv->type) != REFERENCE_TYPE);
+  gcc_assert (TYPE_REF_P (type));
+  gcc_assert (!TYPE_REF_P (conv->type));
 
   t = TREE_TYPE (type);
 
@@ -1567,7 +1567,7 @@ reference_binding (tree rto, tree rfrom, tree expr, bool c_cast_p, int flags,
     skip:;
     }
 
-  if (TREE_CODE (from) == REFERENCE_TYPE)
+  if (TYPE_REF_P (from))
     {
       from = TREE_TYPE (from);
       if (!TYPE_REF_IS_RVALUE (rfrom)
@@ -1633,7 +1633,7 @@ reference_binding (tree rto, tree rfrom, tree expr, bool c_cast_p, int flags,
       conv = build_identity_conv (tfrom, expr);
       conv = direct_reference_binding (rto, conv);
 
-      if (TREE_CODE (rfrom) == REFERENCE_TYPE)
+      if (TYPE_REF_P (rfrom))
 	/* Handle rvalue reference to function properly.  */
 	conv->rvaluedness_matches_p
 	  = (TYPE_REF_IS_RVALUE (rto) == TYPE_REF_IS_RVALUE (rfrom));
@@ -1835,7 +1835,7 @@ implicit_conversion (tree to, tree from, tree expr, bool c_cast_p,
       from = TREE_TYPE (expr);
     }
 
-  if (TREE_CODE (to) == REFERENCE_TYPE)
+  if (TYPE_REF_P (to))
     conv = reference_binding (to, from, expr, c_cast_p, flags, complain);
   else
     conv = standard_conversion (to, from, expr, c_cast_p, flags, complain);
@@ -2845,7 +2845,7 @@ add_builtin_candidate (struct z_candidate **candidates, enum tree_code code,
      we need candidates for both of them.  */
   if (type2 && !same_type_p (type1, type2)
       && TREE_CODE (type1) == TREE_CODE (type2)
-      && (TREE_CODE (type1) == REFERENCE_TYPE
+      && (TYPE_REF_P (type1)
 	  || (TYPE_PTR_P (type1) && TYPE_PTR_P (type2))
 	  || (TYPE_PTRDATAMEM_P (type1) && TYPE_PTRDATAMEM_P (type2))
 	  || TYPE_PTRMEMFUNC_P (type1)
@@ -3007,11 +3007,11 @@ add_builtin_candidates (struct z_candidate **candidates, enum tree_code code,
 	      type = TREE_TYPE (convs);
 
 	      if (i == 0 && ref1
-		  && (TREE_CODE (type) != REFERENCE_TYPE
+		  && (!TYPE_REF_P (type)
 		      || CP_TYPE_CONST_P (TREE_TYPE (type))))
 		continue;
 
-	      if (code == COND_EXPR && TREE_CODE (type) == REFERENCE_TYPE)
+	      if (code == COND_EXPR && TYPE_REF_P (type))
 		vec_safe_push (types[i], type);
 
 	      type = non_reference (type);
@@ -3818,7 +3818,7 @@ build_user_type_conversion_1 (tree totype, tree expr, int flags,
 
 	     We represent this in the conversion sequence with an
 	     rvalue conversion, which means a constructor call.  */
-	  if (TREE_CODE (totype) != REFERENCE_TYPE
+	  if (!TYPE_REF_P (totype)
 	      && !(convflags & LOOKUP_NO_TEMP_BIND))
 	    cand->second_conv
 	      = build_conv (ck_rvalue, totype, cand->second_conv);
@@ -3842,7 +3842,7 @@ build_user_type_conversion_1 (tree totype, tree expr, int flags,
 	 find a direct binding, so don't even consider temporaries.  If
 	 we don't find a direct binding, the caller will try again to
 	 look for a temporary binding.  */
-      if (TREE_CODE (totype) == REFERENCE_TYPE)
+      if (TYPE_REF_P (totype))
 	convflags |= LOOKUP_NO_TEMP_BIND;
 
       old_candidates = candidates;
@@ -4514,7 +4514,7 @@ build_op_call_1 (tree obj, vec<tree, va_gc> **args, tsubst_flags_t complain)
 
       if (TYPE_PTRFN_P (totype)
 	  || TYPE_REFFN_P (totype)
-	  || (TREE_CODE (totype) == REFERENCE_TYPE
+	  || (TYPE_REF_P (totype)
 	      && TYPE_PTRFN_P (TREE_TYPE (totype))))
 	for (ovl_iterator iter (TREE_VALUE (convs)); iter; ++iter)
 	  {
@@ -5733,7 +5733,7 @@ build_new_op_1 (location_t loc, enum tree_code code, int flags, tree arg1,
 	    {
 	      parmtype = TREE_VALUE (parmlist);
 
-	      if (TREE_CODE (parmtype) == REFERENCE_TYPE)
+	      if (TYPE_REF_P (parmtype))
 		parmtype = TREE_TYPE (parmtype);
 	      if (TREE_CODE (TREE_TYPE (args[i])) == ENUMERAL_TYPE
 		  && (same_type_ignoring_top_level_qualifiers_p
@@ -7246,7 +7246,7 @@ build_x_va_arg (source_location loc, tree expr, tree type)
 
   expr = mark_lvalue_use (expr);
 
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     {
       error ("cannot receive reference type %qT through %<...%>", type);
       return error_mark_node;
@@ -7618,7 +7618,7 @@ conv_binds_ref_to_prvalue (conversion *c)
 
   if (c->kind == ck_rvalue)
     return true;
-  if (c->kind == ck_user && TREE_CODE (c->type) != REFERENCE_TYPE)
+  if (c->kind == ck_user && !TYPE_REF_P (c->type))
     return true;
   if (c->kind == ck_identity && c->u.expr
       && TREE_CODE (c->u.expr) == TARGET_EXPR)
@@ -7862,7 +7862,7 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
 	     reference to the object’s type (possibly cv-qualified)...." */
 	  gcc_assert (!(complain & tf_error));
 	  tree ptype = convs[0]->type;
-	  if (TREE_CODE (ptype) != REFERENCE_TYPE
+	  if (!TYPE_REF_P (ptype)
 	      || !TYPE_REF_IS_RVALUE (ptype)
 	      || CONVERSION_RANK (convs[0]) > cr_exact)
 	    return error_mark_node;
@@ -8097,7 +8097,7 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
 	  /* For -Wformat undo the implicit passing by hidden reference
 	     done by convert_arg_to_ellipsis.  */
 	  if (TREE_CODE (argarray[j]) == ADDR_EXPR
-	      && TREE_CODE (TREE_TYPE (argarray[j])) == REFERENCE_TYPE)
+	      && TYPE_REF_P (TREE_TYPE (argarray[j])))
 	    fargs[j] = TREE_OPERAND (argarray[j], 0);
 	  else
 	    fargs[j] = maybe_constant_value (argarray[j]);
@@ -8153,12 +8153,12 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
       targ = arg;
       /* Strip the reference binding for the constructor parameter.  */
       if (CONVERT_EXPR_P (targ)
-	  && TREE_CODE (TREE_TYPE (targ)) == REFERENCE_TYPE)
+	  && TYPE_REF_P (TREE_TYPE (targ)))
 	targ = TREE_OPERAND (targ, 0);
       /* But don't strip any other reference bindings; binding a temporary to a
 	 reference prevents copy elision.  */
       while ((CONVERT_EXPR_P (targ)
-	      && TREE_CODE (TREE_TYPE (targ)) != REFERENCE_TYPE)
+	      && !TYPE_REF_P (TREE_TYPE (targ)))
 	     || TREE_CODE (targ) == NON_LVALUE_EXPR)
 	targ = TREE_OPERAND (targ, 0);
       if (TREE_CODE (targ) == ADDR_EXPR)
@@ -10672,7 +10672,7 @@ perform_implicit_conversion_flags (tree type, tree expr,
   void *p;
   location_t loc = EXPR_LOC_OR_LOC (expr, input_location);
 
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     expr = mark_lvalue_use (expr);
   else
     expr = mark_rvalue_use (expr);
@@ -11094,7 +11094,7 @@ extend_ref_init_temps (tree decl, tree init, vec<tree, va_gc> **cleanups)
   tree type = TREE_TYPE (init);
   if (processing_template_decl)
     return init;
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     init = extend_ref_init_temps_1 (decl, init, cleanups);
   else
     {
@@ -11136,7 +11136,7 @@ bool
 type_has_extended_temps (tree type)
 {
   type = strip_array_types (type);
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     return true;
   if (CLASS_TYPE_P (type))
     {
diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index 4616d8d..e51946d 100644
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -3054,7 +3054,7 @@ one_inheriting_sig (tree t, tree ctor, tree *parms, int nparms)
   if (nparms == 0)
     return;
   if (nparms == 1
-      && TREE_CODE (parms[0]) == REFERENCE_TYPE)
+      && TYPE_REF_P (parms[0]))
     {
       tree parm = TYPE_MAIN_VARIANT (TREE_TYPE (parms[0]));
       if (parm == t || parm == DECL_CONTEXT (ctor))
@@ -3463,7 +3463,7 @@ check_field_decls (tree t, tree *access_decls,
 		     "a member of a union", x);
 	      continue;
 	    }
-	  if (TREE_CODE (type) == REFERENCE_TYPE
+	  if (TYPE_REF_P (type)
 	      && TREE_CODE (x) == FIELD_DECL)
 	    {
 	      error ("non-static data member %q+D in a union may not "
@@ -3517,7 +3517,7 @@ check_field_decls (tree t, tree *access_decls,
 	CLASSTYPE_NON_STD_LAYOUT (t) = 1;
 
       /* If this is of reference type, check if it needs an init.  */
-      if (TREE_CODE (type) == REFERENCE_TYPE)
+      if (TYPE_REF_P (type))
 	{
 	  CLASSTYPE_NON_LAYOUT_POD_P (t) = 1;
 	  CLASSTYPE_NON_STD_LAYOUT (t) = 1;
@@ -3595,7 +3595,7 @@ check_field_decls (tree t, tree *access_decls,
 		     "and %<mutable%>", x);
 	      continue;
 	    }
-	  if (TREE_CODE (type) == REFERENCE_TYPE)
+	  if (TYPE_REF_P (type))
 	    {
 	      error ("member %q+D cannot be declared as a %<mutable%> "
 		     "reference", x);
@@ -5594,7 +5594,7 @@ check_bases_and_members (tree t)
 	    continue;
 
 	  type = TREE_TYPE (field);
-	  if (TREE_CODE (type) == REFERENCE_TYPE)
+	  if (TYPE_REF_P (type))
 	    warning_at (DECL_SOURCE_LOCATION (field),
 			OPT_Wuninitialized, "non-static reference %q#D "
 			"in class without a constructor", field);
@@ -6454,8 +6454,8 @@ find_flexarrays (tree t, flexmems_t *fmem, bool base_p,
 	 members if it hasn't been yet.  */
       tree eltype = fldtype;
       while (TREE_CODE (eltype) == ARRAY_TYPE
-	     || TREE_CODE (eltype) == POINTER_TYPE
-	     || TREE_CODE (eltype) == REFERENCE_TYPE)
+	     || TYPE_PTR_P (eltype)
+	     || TYPE_REF_P (eltype))
 	eltype = TREE_TYPE (eltype);
 
       if (RECORD_OR_UNION_TYPE_P (eltype))
@@ -7069,7 +7069,7 @@ finish_struct (tree t, tree attributes)
       if (processing_template_decl)
 	{
 	  tree f = next_initializable_field (TYPE_FIELDS (t));
-	  if (f && TREE_CODE (TREE_TYPE (f)) == POINTER_TYPE)
+	  if (f && TYPE_PTR_P (TREE_TYPE (f)))
 	    {
 	      f = next_initializable_field (DECL_CHAIN (f));
 	      if (f && same_type_p (TREE_TYPE (f), size_type_node))
@@ -7214,7 +7214,7 @@ fixed_type_or_null (tree instance, int *nonnull, int *cdtorp)
 	      return TREE_TYPE (TREE_TYPE (instance));
 	    }
 	}
-      else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE)
+      else if (TYPE_REF_P (TREE_TYPE (instance)))
 	{
 	  /* We only need one hash table because it is always left empty.  */
 	  if (!fixed_type_or_null_ref_ht)
diff --git a/gcc/cp/constexpr.c b/gcc/cp/constexpr.c
index d9a4cab..9ee37de 100644
--- a/gcc/cp/constexpr.c
+++ b/gcc/cp/constexpr.c
@@ -60,7 +60,7 @@ literal_type_p (tree t)
 {
   if (SCALAR_TYPE_P (t)
       || VECTOR_TYPE_P (t)
-      || TREE_CODE (t) == REFERENCE_TYPE
+      || TYPE_REF_P (t)
       || (VOID_TYPE_P (t) && cxx_dialect >= cxx14))
     return true;
   if (CLASS_TYPE_P (t))
@@ -1328,7 +1328,7 @@ cxx_bind_parameters_in_call (const constexpr_ctx *ctx, tree t,
 	  arg = unshare_constructor (arg);
 	  /* Make sure the binding has the same type as the parm.  But
 	     only for constant args.  */
-	  if (TREE_CODE (type) != REFERENCE_TYPE)
+	  if (!TYPE_REF_P (type))
 	    arg = adjust_temp_type (type, arg);
 	  if (!TREE_CONSTANT (arg))
 	    *non_constant_args = true;
@@ -3394,7 +3394,7 @@ non_const_var_error (tree r)
       else
 	gcc_unreachable ();
     }
-  else if (TREE_CODE (type) == REFERENCE_TYPE)
+  else if (TYPE_REF_P (type))
     inform (DECL_SOURCE_LOCATION (r),
 	    "%qD was not initialized with a constant "
 	    "expression", r);
@@ -4104,7 +4104,7 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
 	}
 
       if (TREE_CODE (t) == INTEGER_CST
-	  && TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE
+	  && TYPE_PTR_P (TREE_TYPE (t))
 	  && !integer_zerop (t))
 	{
 	  if (!ctx->quiet)
@@ -4185,13 +4185,13 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
       return t;
 
     case PARM_DECL:
-      if (lval && TREE_CODE (TREE_TYPE (t)) != REFERENCE_TYPE)
+      if (lval && !TYPE_REF_P (TREE_TYPE (t)))
 	/* glvalue use.  */;
       else if (tree *p = ctx->values->get (r))
 	r = *p;
       else if (lval)
 	/* Defer in case this is only used for its type.  */;
-      else if (TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE)
+      else if (TYPE_REF_P (TREE_TYPE (t)))
 	/* Defer, there's no lvalue->rvalue conversion.  */;
       else if (COMPLETE_TYPE_P (TREE_TYPE (t))
 	       && is_really_empty_class (TREE_TYPE (t)))
@@ -4619,7 +4619,7 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
 	  {
 	    if (integer_zerop (op))
 	      {
-		if (TREE_CODE (type) == REFERENCE_TYPE)
+		if (TYPE_REF_P (type))
 		  {
 		    if (!ctx->quiet)
 		      error_at (EXPR_LOC_OR_LOC (t, input_location),
@@ -4627,7 +4627,7 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
 		    *non_constant_p = true;
 		    return t;
 		  }
-		else if (TREE_CODE (TREE_TYPE (op)) == POINTER_TYPE)
+		else if (TYPE_PTR_P (TREE_TYPE (op)))
 		  {
 		    tree from = TREE_TYPE (op);
 
@@ -5807,7 +5807,7 @@ potential_constant_expression_1 (tree t, bool want_rval, bool strict, bool now,
 	}
 
       return (RECUR (TREE_OPERAND (t, 0),
-		     TREE_CODE (TREE_TYPE (t)) != REFERENCE_TYPE));
+		     !TYPE_REF_P (TREE_TYPE (t))));
 
     case BIND_EXPR:
       return RECUR (BIND_EXPR_BODY (t), want_rval);
diff --git a/gcc/cp/cp-gimplify.c b/gcc/cp/cp-gimplify.c
index 317ba45..eda5f05 100644
--- a/gcc/cp/cp-gimplify.c
+++ b/gcc/cp/cp-gimplify.c
@@ -874,7 +874,7 @@ omp_var_to_track (tree decl)
   tree type = TREE_TYPE (decl);
   if (is_invisiref_parm (decl))
     type = TREE_TYPE (type);
-  else if (TREE_CODE (type) == REFERENCE_TYPE)
+  else if (TYPE_REF_P (type))
     type = TREE_TYPE (type);
   while (TREE_CODE (type) == ARRAY_TYPE)
     type = TREE_TYPE (type);
@@ -928,7 +928,7 @@ omp_cxx_notice_variable (struct cp_genericize_omp_taskreg *omp_ctx, tree decl)
 	      tree type = TREE_TYPE (decl);
 	      if (is_invisiref_parm (decl))
 		type = TREE_TYPE (type);
-	      else if (TREE_CODE (type) == REFERENCE_TYPE)
+	      else if (TYPE_REF_P (type))
 		type = TREE_TYPE (type);
 	      while (TREE_CODE (type) == ARRAY_TYPE)
 		type = TREE_TYPE (type);
@@ -1091,7 +1091,7 @@ cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
     }
 
   if (TREE_CODE (stmt) == INTEGER_CST
-      && TREE_CODE (TREE_TYPE (stmt)) == REFERENCE_TYPE
+      && TYPE_REF_P (TREE_TYPE (stmt))
       && (flag_sanitize & (SANITIZE_NULL | SANITIZE_ALIGNMENT))
       && !wtd->no_sanitize_p)
     {
@@ -1486,7 +1486,7 @@ cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
     case NOP_EXPR:
       if (!wtd->no_sanitize_p
 	  && sanitize_flags_p (SANITIZE_NULL | SANITIZE_ALIGNMENT)
-	  && TREE_CODE (TREE_TYPE (stmt)) == REFERENCE_TYPE)
+	  && TYPE_REF_P (TREE_TYPE (stmt)))
 	ubsan_maybe_instrument_reference (stmt_p);
       break;
 
@@ -1513,8 +1513,7 @@ cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
 	  else if (fn == NULL_TREE
 		   && CALL_EXPR_IFN (stmt) == IFN_UBSAN_NULL
 		   && TREE_CODE (CALL_EXPR_ARG (stmt, 0)) == INTEGER_CST
-		   && (TREE_CODE (TREE_TYPE (CALL_EXPR_ARG (stmt, 0)))
-		       == REFERENCE_TYPE))
+		   && TYPE_REF_P (TREE_TYPE (CALL_EXPR_ARG (stmt, 0))))
 	    *walk_subtrees = 0;
 	}
       /* Fall through.  */
@@ -1907,7 +1906,7 @@ cxx_omp_clause_dtor (tree clause, tree decl)
 bool
 cxx_omp_privatize_by_reference (const_tree decl)
 {
-  return (TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE
+  return (TYPE_REF_P (TREE_TYPE (decl))
 	  || is_invisiref_parm (decl));
 }
 
@@ -1916,7 +1915,7 @@ bool
 cxx_omp_const_qual_no_mutable (tree decl)
 {
   tree type = TREE_TYPE (decl);
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     {
       if (!is_invisiref_parm (decl))
 	return false;
@@ -2017,7 +2016,7 @@ cxx_omp_finish_clause (tree c, gimple_seq *)
   inner_type = TREE_TYPE (decl);
   if (decl == error_mark_node)
     make_shared = true;
-  else if (TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE)
+  else if (TYPE_REF_P (TREE_TYPE (decl)))
     inner_type = TREE_TYPE (inner_type);
 
   /* We're interested in the base element, not arrays.  */
@@ -2065,7 +2064,7 @@ cp_fold_maybe_rvalue (tree x, bool rval)
     {
       x = cp_fold (x);
       if (rval && DECL_P (x)
-	  && TREE_CODE (TREE_TYPE (x)) != REFERENCE_TYPE)
+	  && !TYPE_REF_P (TREE_TYPE (x)))
 	{
 	  tree v = decl_constant_value (x);
 	  if (v != x && v != error_mark_node)
diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index 353bc6a..4b4f882 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -3621,8 +3621,7 @@ struct GTY(()) lang_decl {
 #define REFERENCE_REF_P(NODE)				\
   (INDIRECT_REF_P (NODE)				\
    && TREE_TYPE (TREE_OPERAND (NODE, 0))		\
-   && (TREE_CODE (TREE_TYPE (TREE_OPERAND ((NODE), 0)))	\
-       == REFERENCE_TYPE))
+   && TYPE_REF_P (TREE_TYPE (TREE_OPERAND ((NODE), 0))))
 
 /* True if NODE is a REFERENCE_TYPE which is OK to instantiate to be a
    reference to VLA type, because it's used for VLA capture.  */
@@ -4227,10 +4226,15 @@ more_aggr_init_expr_args_p (const aggr_init_expr_arg_iterator *iter)
 /* Returns true if NODE is a pointer-to-data-member.  */
 #define TYPE_PTRDATAMEM_P(NODE)			\
   (TREE_CODE (NODE) == OFFSET_TYPE)
+
 /* Returns true if NODE is a pointer.  */
 #define TYPE_PTR_P(NODE)			\
   (TREE_CODE (NODE) == POINTER_TYPE)
 
+/* Returns true if NODE is a reference.  */
+#define TYPE_REF_P(NODE)			\
+  (TREE_CODE (NODE) == REFERENCE_TYPE)
+
 /* Returns true if NODE is an object type:
 
      [basic.types]
@@ -4240,7 +4244,7 @@ more_aggr_init_expr_args_p (const aggr_init_expr_arg_iterator *iter)
 
    Keep these checks in ascending order, for speed.  */
 #define TYPE_OBJ_P(NODE)			\
-  (TREE_CODE (NODE) != REFERENCE_TYPE		\
+  (!TYPE_REF_P (NODE)				\
    && !VOID_TYPE_P (NODE)  		        \
    && TREE_CODE (NODE) != FUNCTION_TYPE		\
    && TREE_CODE (NODE) != METHOD_TYPE)
@@ -4253,7 +4257,7 @@ more_aggr_init_expr_args_p (const aggr_init_expr_arg_iterator *iter)
 /* Returns true if NODE is a reference to an object.  Keep these checks
    in ascending tree code order.  */
 #define TYPE_REF_OBJ_P(NODE)					\
-  (TREE_CODE (NODE) == REFERENCE_TYPE && TYPE_OBJ_P (TREE_TYPE (NODE)))
+  (TYPE_REF_P (NODE) && TYPE_OBJ_P (TREE_TYPE (NODE)))
 
 /* Returns true if NODE is a pointer to an object, or a pointer to
    void.  Keep these checks in ascending tree code order.  */
@@ -4269,7 +4273,7 @@ more_aggr_init_expr_args_p (const aggr_init_expr_arg_iterator *iter)
 
 /* Returns true if NODE is a reference to function type.  */
 #define TYPE_REFFN_P(NODE)				\
-  (TREE_CODE (NODE) == REFERENCE_TYPE			\
+  (TYPE_REF_P (NODE)					\
    && TREE_CODE (TREE_TYPE (NODE)) == FUNCTION_TYPE)
 
 /* Returns true if NODE is a pointer to member function type.  */
diff --git a/gcc/cp/cp-ubsan.c b/gcc/cp/cp-ubsan.c
index 97ac3d6..507433a 100644
--- a/gcc/cp/cp-ubsan.c
+++ b/gcc/cp/cp-ubsan.c
@@ -265,7 +265,7 @@ cp_ubsan_maybe_instrument_downcast (location_t loc, tree type,
     return NULL_TREE;
 
   return cp_ubsan_maybe_instrument_vptr (loc, op, TREE_TYPE (type), true,
-					 TREE_CODE (type) == POINTER_TYPE
+					 TYPE_PTR_P (type)
 					 ? UBSAN_DOWNCAST_POINTER
 					 : UBSAN_DOWNCAST_REFERENCE);
 }
diff --git a/gcc/cp/cvt.c b/gcc/cp/cvt.c
index 9494f29..30b44b7 100644
--- a/gcc/cp/cvt.c
+++ b/gcc/cp/cvt.c
@@ -322,7 +322,7 @@ build_up_reference (tree type, tree arg, int flags, tree decl,
   tree argtype = TREE_TYPE (arg);
   tree target_type = TREE_TYPE (type);
 
-  gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
+  gcc_assert (TYPE_REF_P (type));
 
   if ((flags & DIRECT_BIND) && ! lvalue_p (arg))
     {
@@ -429,8 +429,8 @@ convert_to_reference (tree reftype, tree expr, int convtype,
 
   intype = TREE_TYPE (expr);
 
-  gcc_assert (TREE_CODE (intype) != REFERENCE_TYPE);
-  gcc_assert (TREE_CODE (reftype) == REFERENCE_TYPE);
+  gcc_assert (!TYPE_REF_P (intype));
+  gcc_assert (TYPE_REF_P (reftype));
 
   intype = TYPE_MAIN_VARIANT (intype);
 
@@ -533,7 +533,7 @@ tree
 convert_from_reference (tree val)
 {
   if (TREE_TYPE (val)
-      && TREE_CODE (TREE_TYPE (val)) == REFERENCE_TYPE)
+      && TYPE_REF_P (TREE_TYPE (val)))
     {
       tree t = TREE_TYPE (TREE_TYPE (val));
       tree ref = build1 (INDIRECT_REF, t, val);
@@ -1163,8 +1163,7 @@ convert_to_void (tree expr, impl_conv_void implicit, tsubst_flags_t complain)
     case INDIRECT_REF:
       {
 	tree type = TREE_TYPE (expr);
-	int is_reference = TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0)))
-			   == REFERENCE_TYPE;
+	int is_reference = TYPE_REF_P (TREE_TYPE (TREE_OPERAND (expr, 0)));
 	int is_volatile = TYPE_VOLATILE (type);
 	int is_complete = COMPLETE_TYPE_P (complete_type (type));
 
@@ -2011,8 +2010,8 @@ noexcept_conv_p (tree to, tree from)
       t = TYPE_PTRMEMFUNC_FN_TYPE (t);
       f = TYPE_PTRMEMFUNC_FN_TYPE (f);
     }
-  if (TREE_CODE (t) == POINTER_TYPE
-      && TREE_CODE (f) == POINTER_TYPE)
+  if (TYPE_PTR_P (t)
+      && TYPE_PTR_P (f))
     {
       t = TREE_TYPE (t);
       f = TREE_TYPE (f);
@@ -2042,8 +2041,8 @@ fnptr_conv_p (tree to, tree from)
       t = TYPE_PTRMEMFUNC_FN_TYPE (t);
       f = TYPE_PTRMEMFUNC_FN_TYPE (f);
     }
-  if (TREE_CODE (t) == POINTER_TYPE
-      && TREE_CODE (f) == POINTER_TYPE)
+  if (TYPE_PTR_P (t)
+      && TYPE_PTR_P (f))
     {
       t = TREE_TYPE (t);
       f = TREE_TYPE (f);
diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index 20ca28f..59d6bad 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -674,7 +674,7 @@ poplevel (int keep, int reverse, int functionbody)
 	      }
 	    else if (DECL_CONTEXT (decl) == current_function_decl
 		     // For -Wunused-but-set-variable leave references alone.
-		     && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
+		     && !TYPE_REF_P (TREE_TYPE (decl))
 		     && errorcount == unused_but_set_errorcount)
 	      {
 		if (!DECL_NAME (decl) && DECL_DECOMPOSITION_P (decl))
@@ -5562,7 +5562,7 @@ check_for_uninitialized_const_var (tree decl, bool constexpr_context_p,
      external linkage and must be initialized. ($8.4; $12.1)'' ARM
      7.1.6 */
   if (VAR_P (decl)
-      && TREE_CODE (type) != REFERENCE_TYPE
+      && !TYPE_REF_P (type)
       && (constexpr_context_p
 	  || CP_TYPE_CONST_P (type) || var_in_constexpr_fn (decl))
       && !DECL_NONTRIVIALLY_INITIALIZED_P (decl))
@@ -6265,7 +6265,7 @@ check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
 
   if (TREE_CODE (decl) == CONST_DECL)
     {
-      gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
+      gcc_assert (!TYPE_REF_P (type));
 
       DECL_INITIAL (decl) = init;
 
@@ -6275,9 +6275,9 @@ check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
   else if (!init && DECL_REALLY_EXTERN (decl))
     ;
   else if (init || type_build_ctor_call (type)
-	   || TREE_CODE (type) == REFERENCE_TYPE)
+	   || TYPE_REF_P (type))
     {
-      if (TREE_CODE (type) == REFERENCE_TYPE)
+      if (TYPE_REF_P (type))
 	{
 	  init = grok_reference_init (decl, type, init, flags);
 	  flags |= LOOKUP_ALREADY_DIGESTED;
@@ -6616,7 +6616,7 @@ initialize_local_var (tree decl, tree init)
 	  gcc_assert (TREE_OPERAND (init, 0) == decl);
 	  DECL_INITIAL (decl) = rinit;
 
-	  if (warn_init_self && TREE_CODE (type) == REFERENCE_TYPE)
+	  if (warn_init_self && TYPE_REF_P (type))
 	    {
 	      STRIP_NOPS (rinit);
 	      if (rinit == decl)
@@ -6889,7 +6889,7 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
       /* If DECL is a reference, then we want to know whether init is a
 	 reference constant; init_const_expr_p as passed tells us whether
 	 it's an rvalue constant.  */
-      if (TREE_CODE (type) == REFERENCE_TYPE)
+      if (TYPE_REF_P (type))
 	init_const_expr_p = potential_constant_expression (init);
       if (init_const_expr_p)
 	{
@@ -6898,7 +6898,7 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
 	  DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
 	  if (decl_maybe_constant_var_p (decl)
 	      /* FIXME setting TREE_CONSTANT on refs breaks the back end.  */
-	      && TREE_CODE (type) != REFERENCE_TYPE)
+	      && !TYPE_REF_P (type))
 	    TREE_CONSTANT (decl) = 1;
 	}
     }
@@ -6935,7 +6935,7 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
 	}
       else if (init
 	       && init_const_expr_p
-	       && TREE_CODE (type) != REFERENCE_TYPE
+	       && !TYPE_REF_P (type)
 	       && decl_maybe_constant_var_p (decl)
 	       && !(dep_init = value_dependent_init_p (init)))
 	{
@@ -7004,7 +7004,7 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
   /* A reference will be modified here, as it is initialized.  */
   if (! DECL_EXTERNAL (decl)
       && TREE_READONLY (decl)
-      && TREE_CODE (type) == REFERENCE_TYPE)
+      && TYPE_REF_P (type))
     {
       was_readonly = 1;
       TREE_READONLY (decl) = 0;
@@ -7345,7 +7345,7 @@ get_tuple_decomp_init (tree decl, unsigned i)
 
   /* [The id-expression] e is an lvalue if the type of the entity e is an
      lvalue reference and an xvalue otherwise.  */
-  if (TREE_CODE (etype) != REFERENCE_TYPE
+  if (!TYPE_REF_P (etype)
       || TYPE_REF_IS_RVALUE (etype))
     e = move (e);
 
@@ -7488,7 +7488,7 @@ cp_finish_decomp (tree decl, tree first, unsigned int count)
   tree type = TREE_TYPE (decl);
   tree dexp = decl;
 
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     {
       dexp = convert_from_reference (dexp);
       type = complete_type (TREE_TYPE (type));
@@ -11298,7 +11298,7 @@ grokdeclarator (const cp_declarator *declarator,
 	  /* Filter out pointers-to-references and references-to-references.
 	     We can get these if a TYPE_DECL is used.  */
 
-	  if (TREE_CODE (type) == REFERENCE_TYPE)
+	  if (TYPE_REF_P (type))
 	    {
 	      if (declarator->kind != cdk_reference)
 		{
@@ -11404,7 +11404,7 @@ grokdeclarator (const cp_declarator *declarator,
               */
 	      if (VOID_TYPE_P (type))
 		/* We already gave an error.  */;
-	      else if (TREE_CODE (type) == REFERENCE_TYPE)
+	      else if (TYPE_REF_P (type))
 		{
 		  if (declarator->u.reference.rvalue_ref)
 		    /* Leave type alone.  */;
@@ -11485,7 +11485,7 @@ grokdeclarator (const cp_declarator *declarator,
       /* DR1688 says that a `constexpr' specifier in combination with
 	 `volatile' is valid.  */
 
-      if (TREE_CODE (type) != REFERENCE_TYPE)
+      if (!TYPE_REF_P (type))
 	{
 	  type_quals |= TYPE_QUAL_CONST;
 	  type = cp_build_qualified_type (type, type_quals);
@@ -11668,7 +11668,7 @@ grokdeclarator (const cp_declarator *declarator,
 	  error ("const %qs cannot be declared %<mutable%>", name);
 	  storage_class = sc_none;
 	}
-      else if (TREE_CODE (type) == REFERENCE_TYPE)
+      else if (TYPE_REF_P (type))
 	{
 	  permerror (input_location, "reference %qs cannot be declared "
 	             "%<mutable%>", name);
@@ -12894,7 +12894,7 @@ copy_fn_p (const_tree d)
       /* Pass by value copy assignment operator.  */
       result = -1;
     }
-  else if (TREE_CODE (arg_type) == REFERENCE_TYPE
+  else if (TYPE_REF_P (arg_type)
 	   && !TYPE_REF_IS_RVALUE (arg_type)
 	   && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
     {
@@ -12962,7 +12962,7 @@ move_signature_fn_p (const_tree d)
   if (arg_type == error_mark_node)
     return 0;
 
-  if (TREE_CODE (arg_type) == REFERENCE_TYPE
+  if (TYPE_REF_P (arg_type)
       && TYPE_REF_IS_RVALUE (arg_type)
       && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
                       DECL_CONTEXT (d)))
@@ -13334,7 +13334,7 @@ grok_op_properties (tree decl, bool complain)
       && warn_conversion)
     {
       tree t = TREE_TYPE (name);
-      int ref = (TREE_CODE (t) == REFERENCE_TYPE);
+      int ref = TYPE_REF_P (t);
 
       if (ref)
 	t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
@@ -13388,14 +13388,14 @@ grok_op_properties (tree decl, bool complain)
     {
       tree arg = TREE_VALUE (argtypes);
       tree ret = TREE_TYPE (TREE_TYPE (decl));
-      if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
+      if (methodp || TYPE_REF_P (arg))
 	arg = TREE_TYPE (arg);
       arg = TYPE_MAIN_VARIANT (arg);
 
       if (operator_code == PREINCREMENT_EXPR
 	  || operator_code == PREDECREMENT_EXPR)
 	{
-	  if (TREE_CODE (ret) != REFERENCE_TYPE
+	  if (!TYPE_REF_P (ret)
 	      || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)), arg))
 	    warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
 		     build_reference_type (arg));
@@ -13414,7 +13414,7 @@ grok_op_properties (tree decl, bool complain)
 	  || operator_code == TRUNC_DIV_EXPR
 	  || operator_code == MULT_EXPR
 	  || operator_code == TRUNC_MOD_EXPR)
-      && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
+      && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl))))
     warning (OPT_Weffc__, "%qD should return by value", decl);
 
   return true;
@@ -15822,7 +15822,7 @@ finish_function (bool inline_p)
 	    && !TREE_NO_WARNING (decl)
 	    && !DECL_IN_SYSTEM_HEADER (decl)
 	    && TREE_TYPE (decl) != error_mark_node
-	    && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
+	    && !TYPE_REF_P (TREE_TYPE (decl))
 	    && (!CLASS_TYPE_P (TREE_TYPE (decl))
 	        || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
 	  warning_at (DECL_SOURCE_LOCATION (decl),
diff --git a/gcc/cp/decl2.c b/gcc/cp/decl2.c
index 6f3ad4c..0a6cf91 100644
--- a/gcc/cp/decl2.c
+++ b/gcc/cp/decl2.c
@@ -462,7 +462,7 @@ grok_array_decl (location_t loc, tree array_expr, tree index_exp,
       if (array_expr == error_mark_node || index_exp == error_mark_node)
 	error ("ambiguous conversion for array subscript");
 
-      if (TREE_CODE (TREE_TYPE (array_expr)) == POINTER_TYPE)
+      if (TYPE_PTR_P (TREE_TYPE (array_expr)))
 	array_expr = mark_rvalue_use (array_expr);
       else
 	array_expr = mark_lvalue_use_nonread (array_expr);
@@ -1345,7 +1345,7 @@ cp_reconstruct_complex_type (tree type, tree bottom)
       outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
 					   TYPE_REF_CAN_ALIAS_ALL (type));
     }
-  else if (TREE_CODE (type) == REFERENCE_TYPE)
+  else if (TYPE_REF_P (type))
     {
       inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
       outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
@@ -4275,7 +4275,7 @@ decl_maybe_constant_var_p (tree decl)
   if (DECL_HAS_VALUE_EXPR_P (decl))
     /* A proxy isn't constant.  */
     return false;
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     /* References can be constant.  */;
   else if (CP_TYPE_CONST_NON_VOLATILE_P (type)
 	   && INTEGRAL_OR_ENUMERATION_TYPE_P (type))
diff --git a/gcc/cp/error.c b/gcc/cp/error.c
index 95b8b84..374ab0d 100644
--- a/gcc/cp/error.c
+++ b/gcc/cp/error.c
@@ -784,13 +784,13 @@ dump_type_prefix (cxx_pretty_printer *pp, tree t, int flags)
 	  }
 	if (TYPE_PTR_P (t))
 	  pp_star (pp);
-	else if (TREE_CODE (t) == REFERENCE_TYPE)
-	{
-	  if (TYPE_REF_IS_RVALUE (t))
-	    pp_ampersand_ampersand (pp);
-	  else
-	    pp_ampersand (pp);
-	}
+	else if (TYPE_REF_P (t))
+	  {
+	    if (TYPE_REF_IS_RVALUE (t))
+	      pp_ampersand_ampersand (pp);
+	    else
+	      pp_ampersand (pp);
+	  }
 	pp->padding = pp_before;
 	pp_cxx_cv_qualifier_seq (pp, t);
       }
@@ -2271,7 +2271,7 @@ dump_expr (cxx_pretty_printer *pp, tree t, int flags)
 	    if (!is_this_parameter (ob))
 	      {
 		dump_expr (pp, ob, flags | TFF_EXPR_IN_PARENS);
-		if (TREE_CODE (TREE_TYPE (ob)) == REFERENCE_TYPE)
+		if (TYPE_REF_P (TREE_TYPE (ob)))
 		  pp_cxx_dot (pp);
 		else
 		  pp_cxx_arrow (pp);
@@ -2305,7 +2305,7 @@ dump_expr (cxx_pretty_printer *pp, tree t, int flags)
 	     shouldn't print the `&' doing so indicates to the user
 	     that the expression has pointer type.  */
 	  || (TREE_TYPE (t)
-	      && TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE))
+	      && TYPE_REF_P (TREE_TYPE (t))))
 	dump_expr (pp, TREE_OPERAND (t, 0), flags | TFF_EXPR_IN_PARENS);
       else if (TREE_CODE (TREE_OPERAND (t, 0)) == LABEL_DECL)
 	dump_unary_op (pp, "&&", t, flags);
@@ -2417,7 +2417,7 @@ dump_expr (cxx_pretty_printer *pp, tree t, int flags)
 	    && same_type_p (TREE_TYPE (optype),
 			    TREE_TYPE (ttype)))
 	  {
-	    if (TREE_CODE (ttype) == REFERENCE_TYPE)
+	    if (TYPE_REF_P (ttype))
 	      {
 		STRIP_NOPS (op);
 		if (TREE_CODE (op) == ADDR_EXPR)
diff --git a/gcc/cp/except.c b/gcc/cp/except.c
index 6dab6d6..4599619 100644
--- a/gcc/cp/except.c
+++ b/gcc/cp/except.c
@@ -306,7 +306,7 @@ initialize_handler_parm (tree decl, tree exp)
 
   /* Since pointers are passed by value, initialize a reference to
      pointer catch parm with the address of the temporary.  */
-  if (TREE_CODE (init_type) == REFERENCE_TYPE
+  if (TYPE_REF_P (init_type)
       && TYPE_PTR_P (TREE_TYPE (init_type)))
     exp = cp_build_addr_expr (exp, tf_warning_or_error);
 
@@ -802,7 +802,7 @@ complete_ptr_ref_or_void_ptr_p (tree type, tree from)
 
   /* Or a pointer or ref to one, or cv void *.  */
   is_ptr = TYPE_PTR_P (type);
-  if (is_ptr || TREE_CODE (type) == REFERENCE_TYPE)
+  if (is_ptr || TYPE_REF_P (type))
     {
       tree core = TREE_TYPE (type);
 
@@ -846,7 +846,7 @@ is_admissible_throw_operand_or_catch_parameter (tree t, bool is_throw)
   else if (abstract_virtuals_error (is_throw ? ACU_THROW : ACU_CATCH, type))
     return false;
   else if (!is_throw
-	   && TREE_CODE (type) == REFERENCE_TYPE
+	   && TYPE_REF_P (type)
 	   && TYPE_REF_IS_RVALUE (type))
     {
       error ("cannot declare catch parameter to be of rvalue "
diff --git a/gcc/cp/expr.c b/gcc/cp/expr.c
index 15894fc..0d0a10ec 100644
--- a/gcc/cp/expr.c
+++ b/gcc/cp/expr.c
@@ -141,7 +141,7 @@ mark_use (tree expr, bool rvalue_p, bool read_p,
 	    }
 	  expr = process_outer_var_ref (expr, tf_warning_or_error, true);
 	  if (!(TREE_TYPE (oexpr)
-		&& TREE_CODE (TREE_TYPE (oexpr)) == REFERENCE_TYPE))
+		&& TYPE_REF_P (TREE_TYPE (oexpr))))
 	    expr = convert_from_reference (expr);
 	}
       break;
@@ -166,7 +166,7 @@ mark_use (tree expr, bool rvalue_p, bool read_p,
 	    {
 	      /* Look through capture by reference.  */
 	      tree cap = DECL_CAPTURED_VARIABLE (ref);
-	      if (TREE_CODE (TREE_TYPE (cap)) != REFERENCE_TYPE
+	      if (!TYPE_REF_P (TREE_TYPE (cap))
 		  && decl_constant_var_p (cap))
 		{
 		  tree val = RECUR (cap);
diff --git a/gcc/cp/init.c b/gcc/cp/init.c
index b934a00..d9fb0ea 100644
--- a/gcc/cp/init.c
+++ b/gcc/cp/init.c
@@ -287,7 +287,7 @@ build_zero_init_1 (tree type, tree nelts, bool static_storage_p,
     init = build_zero_cst (type);
   else
     {
-      gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
+      gcc_assert (TYPE_REF_P (type));
       init = build_zero_cst (type);
     }
 
@@ -502,7 +502,7 @@ build_value_init_noctor (tree type, tsubst_flags_t complain)
 	error ("value-initialization of function type %qT", type);
       return error_mark_node;
     }
-  else if (TREE_CODE (type) == REFERENCE_TYPE)
+  else if (TYPE_REF_P (type))
     {
       if (complain & tf_error)
 	error ("value-initialization of reference type %qT", type);
@@ -751,7 +751,7 @@ perform_member_init (tree member, tree init)
 	}
     }
   else if (init
-	   && (TREE_CODE (type) == REFERENCE_TYPE
+	   && (TYPE_REF_P (type)
 	       /* Pre-digested NSDMI.  */
 	       || (((TREE_CODE (init) == CONSTRUCTOR
 		     && TREE_TYPE (init) == type)
@@ -856,7 +856,7 @@ perform_member_init (tree member, tree init)
 	{
 	  tree core_type;
 	  /* member traversal: note it leaves init NULL */
-	  if (TREE_CODE (type) == REFERENCE_TYPE)
+	  if (TYPE_REF_P (type))
 	    {
 	      if (permerror (DECL_SOURCE_LOCATION (current_function_decl),
 			     "uninitialized reference member in %q#T", type))
@@ -2368,7 +2368,7 @@ diagnose_uninitialized_cst_or_ref_member_1 (tree type, tree origin,
       if (type_has_user_provided_constructor (field_type))
 	continue;
 
-      if (TREE_CODE (field_type) == REFERENCE_TYPE)
+      if (TYPE_REF_P (field_type))
 	{
 	  ++ error_count;
 	  if (complain)
@@ -3659,7 +3659,7 @@ build_new (vec<tree, va_gc> **placement, tree type, tree nelts,
   /* ``A reference cannot be created by the new operator.  A reference
      is not an object (8.2.2, 8.4.3), so a pointer to it could not be
      returned by new.'' ARM 5.3.3 */
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     {
       if (complain & tf_error)
         error ("new cannot be applied to a reference type");
@@ -4586,7 +4586,7 @@ build_delete (tree otype, tree addr, special_function_kind auto_delete,
   if (type == error_mark_node)
     return error_mark_node;
 
-  if (TREE_CODE (type) == POINTER_TYPE)
+  if (TYPE_PTR_P (type))
     type = TYPE_MAIN_VARIANT (TREE_TYPE (type));
 
   if (TREE_CODE (type) == ARRAY_TYPE)
diff --git a/gcc/cp/lambda.c b/gcc/cp/lambda.c
index e3f22fc..cf7c380 100644
--- a/gcc/cp/lambda.c
+++ b/gcc/cp/lambda.c
@@ -90,7 +90,7 @@ build_lambda_object (tree lambda_expr)
 	val = build_array_copy (val);
       else if (DECL_NORMAL_CAPTURE_P (field)
 	       && !DECL_VLA_CAPTURE_P (field)
-	       && TREE_CODE (TREE_TYPE (field)) != REFERENCE_TYPE)
+	       && !TYPE_REF_P (TREE_TYPE (field)))
 	{
 	  /* "the entities that are captured by copy are used to
 	     direct-initialize each corresponding non-static data
diff --git a/gcc/cp/mangle.c b/gcc/cp/mangle.c
index 2f65709..58b3311 100644
--- a/gcc/cp/mangle.c
+++ b/gcc/cp/mangle.c
@@ -3071,7 +3071,7 @@ write_expression (tree expr)
     }
   else if (INDIRECT_REF_P (expr)
 	   && TREE_TYPE (TREE_OPERAND (expr, 0))
-	   && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
+	   && TYPE_REF_P (TREE_TYPE (TREE_OPERAND (expr, 0))))
     {
       write_expression (TREE_OPERAND (expr, 0));
     }
@@ -3209,7 +3209,7 @@ write_expression (tree expr)
 	 don't actually want to output a mangling code for the `&'.  */
       if (TREE_CODE (expr) == ADDR_EXPR
 	  && TREE_TYPE (expr)
-	  && TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE)
+	  && TYPE_REF_P (TREE_TYPE (expr)))
 	{
 	  expr = TREE_OPERAND (expr, 0);
 	  if (DECL_P (expr))
@@ -3473,7 +3473,7 @@ write_template_arg (tree node)
   if (REFERENCE_REF_P (node))
     node = TREE_OPERAND (node, 0);
   if (TREE_CODE (node) == NOP_EXPR
-      && TREE_CODE (TREE_TYPE (node)) == REFERENCE_TYPE)
+      && TYPE_REF_P (TREE_TYPE (node)))
     {
       /* Template parameters can be of reference type. To maintain
 	 internal consistency, such arguments use a conversion from
diff --git a/gcc/cp/method.c b/gcc/cp/method.c
index eaa930f..e9add9a 100644
--- a/gcc/cp/method.c
+++ b/gcc/cp/method.c
@@ -468,7 +468,7 @@ forward_parm (tree parm)
   tree type = TREE_TYPE (parm);
   if (DECL_PACK_P (parm))
     type = PACK_EXPANSION_PATTERN (type);
-  if (TREE_CODE (type) != REFERENCE_TYPE)
+  if (!TYPE_REF_P (type))
     type = cp_build_reference_type (type, /*rval=*/true);
   warning_sentinel w (warn_useless_cast);
   exp = build_static_cast (type, exp, tf_warning_or_error);
@@ -731,7 +731,7 @@ do_build_copy_constructor (tree fndecl)
 	     the field is "T", then the type will usually be "const
 	     T".  (There are no cv-qualified variants of reference
 	     types.)  */
-	  if (TREE_CODE (expr_type) != REFERENCE_TYPE)
+	  if (!TYPE_REF_P (expr_type))
 	    {
 	      int quals = cvquals;
 
@@ -742,7 +742,7 @@ do_build_copy_constructor (tree fndecl)
 	    }
 
 	  init = build3 (COMPONENT_REF, expr_type, parm, field, NULL_TREE);
-	  if (move_p && TREE_CODE (expr_type) != REFERENCE_TYPE
+	  if (move_p && !TYPE_REF_P (expr_type)
 	      /* 'move' breaks bit-fields, and has no effect for scalars.  */
 	      && !scalarish_type_p (expr_type))
 	    init = move (init);
@@ -829,7 +829,7 @@ do_build_copy_assign (tree fndecl)
 		     "assignment operator", field);
 	      continue;
 	    }
-	  else if (TREE_CODE (expr_type) == REFERENCE_TYPE)
+	  else if (TYPE_REF_P (expr_type))
 	    {
 	      error ("non-static reference member %q#D, can%'t use "
 		     "default assignment operator", field);
@@ -858,7 +858,7 @@ do_build_copy_assign (tree fndecl)
 	  expr_type = cp_build_qualified_type (expr_type, quals);
 
 	  init = build3 (COMPONENT_REF, expr_type, init, field, NULL_TREE);
-	  if (move_p && TREE_CODE (expr_type) != REFERENCE_TYPE
+	  if (move_p && !TYPE_REF_P (expr_type)
 	      /* 'move' breaks bit-fields, and has no effect for scalars.  */
 	      && !scalarish_type_p (expr_type))
 	    init = move (init);
@@ -970,7 +970,7 @@ build_stub_type (tree type, int quals, bool rvalue)
 static tree
 build_stub_object (tree reftype)
 {
-  if (TREE_CODE (reftype) != REFERENCE_TYPE)
+  if (!TYPE_REF_P (reftype))
     reftype = cp_build_reference_type (reftype, /*rval*/true);
   tree stub = build1 (CONVERT_EXPR, reftype, integer_one_node);
   return convert_from_reference (stub);
@@ -1149,7 +1149,7 @@ constructible_expr (tree to, tree from)
       tree ctype = to;
       vec<tree, va_gc> *args = NULL;
       cp_unevaluated cp_uneval_guard;
-      if (TREE_CODE (to) != REFERENCE_TYPE)
+      if (!TYPE_REF_P (to))
 	to = cp_build_reference_type (to, /*rval*/false);
       tree ob = build_stub_object (to);
       for (; from; from = TREE_CHAIN (from))
@@ -1324,7 +1324,7 @@ walk_field_subobs (tree fields, tree fnname, special_function_kind sfk,
 		error ("non-static const member %q#D, can%'t use default "
 		       "assignment operator", field);
 	    }
-	  else if (TREE_CODE (mem_type) == REFERENCE_TYPE)
+	  else if (TYPE_REF_P (mem_type))
 	    {
 	      if (diag)
 		error ("non-static reference member %q#D, can%'t use "
@@ -1372,7 +1372,7 @@ walk_field_subobs (tree fields, tree fnname, special_function_kind sfk,
 		}
 	      bad = true;
 	    }
-	  else if (TREE_CODE (mem_type) == REFERENCE_TYPE)
+	  else if (TYPE_REF_P (mem_type))
 	    {
 	      if (diag)
 		{
@@ -1403,7 +1403,7 @@ walk_field_subobs (tree fields, tree fnname, special_function_kind sfk,
       else if (sfk == sfk_copy_constructor)
 	{
 	  /* 12.8p11b5 */
-	  if (TREE_CODE (mem_type) == REFERENCE_TYPE
+	  if (TYPE_REF_P (mem_type)
 	      && TYPE_REF_IS_RVALUE (mem_type))
 	    {
 	      if (diag)
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 82b8ef8..a06516b 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -34954,7 +34954,7 @@ cp_parser_omp_for_loop_init (cp_parser *parser,
 	      init = cp_parser_assignment_expression (parser);
 
 	    non_class:
-	      if (TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE)
+	      if (TYPE_REF_P (TREE_TYPE (decl)))
 		init = error_mark_node;
 	      else
 		cp_finish_decl (decl, NULL_TREE,
@@ -37417,7 +37417,7 @@ static bool
 cp_parser_omp_declare_reduction_exprs (tree fndecl, cp_parser *parser)
 {
   tree type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fndecl)));
-  gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
+  gcc_assert (TYPE_REF_P (type));
   type = TREE_TYPE (type);
   tree omp_out = build_lang_decl (VAR_DECL, get_identifier ("omp_out"), type);
   DECL_ARTIFICIAL (omp_out) = 1;
@@ -37656,7 +37656,7 @@ cp_parser_omp_declare_reduction (cp_parser *parser, cp_token *pragma_tok,
 	       || TREE_CODE (type) == ARRAY_TYPE)
 	error_at (loc, "function or array type %qT in "
 		       "%<#pragma omp declare reduction%>", type);
-      else if (TREE_CODE (type) == REFERENCE_TYPE)
+      else if (TYPE_REF_P (type))
 	error_at (loc, "reference type %qT in "
 		       "%<#pragma omp declare reduction%>", type);
       else if (TYPE_QUALS_NO_ADDR_SPACE (type))
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index cd9011b..ddfda2e 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -6277,7 +6277,7 @@ convert_nontype_argument_function (tree type, tree expr,
     }
 
  accept:
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     {
       if (REFERENCE_REF_P (fn))
 	fn = TREE_OPERAND (fn, 0);
@@ -6686,7 +6686,7 @@ convert_nontype_argument (tree type, tree expr, tsubst_flags_t complain)
 	}
     }
 
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     expr = mark_lvalue_use (expr);
   else
     expr = mark_rvalue_use (expr);
@@ -6711,7 +6711,7 @@ convert_nontype_argument (tree type, tree expr, tsubst_flags_t complain)
 	     could actually change the type to something more cv-qualified,
 	     and this is not folded by convert_from_reference.  */
 	  tree addr = TREE_OPERAND (probe, 0);
-	  if (TREE_CODE (probe_type) == REFERENCE_TYPE
+	  if (TYPE_REF_P (probe_type)
 	      && TREE_CODE (addr) == ADDR_EXPR
 	      && TYPE_PTR_P (TREE_TYPE (addr))
 	      && (same_type_ignoring_top_level_qualifiers_p
@@ -8019,7 +8019,7 @@ convert_template_argument (tree parm,
           const_tree inner = TREE_OPERAND (val, 0);
 	  const_tree innertype = TREE_TYPE (inner);
 	  if (innertype
-	      && TREE_CODE (innertype) == REFERENCE_TYPE
+	      && TYPE_REF_P (innertype)
 	      && TREE_CODE (TREE_TYPE (innertype)) == FUNCTION_TYPE
 	      && TREE_OPERAND_LENGTH (inner) > 0
               && reject_gcc_builtin (TREE_OPERAND (inner, 0)))
@@ -12204,7 +12204,7 @@ tsubst_pack_expansion (tree t, tree args, tsubst_flags_t complain,
       /* Also optimize expression pack expansions if we can tell that the
 	 elements won't have reference type.  */
       tree type = TREE_TYPE (pattern);
-      if (type && TREE_CODE (type) != REFERENCE_TYPE
+      if (type && !TYPE_REF_P (type)
 	  && !PACK_EXPANSION_P (type)
 	  && !WILDCARD_TYPE_P (type))
 	return args;
@@ -12941,7 +12941,7 @@ tsubst_function_decl (tree t, tree args, tsubst_flags_t complain,
       tree argtype
 	= TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (t))));
       argtype = tsubst (argtype, args, complain, in_decl);
-      if (TREE_CODE (argtype) == REFERENCE_TYPE)
+      if (TYPE_REF_P (argtype))
 	error_at (DECL_SOURCE_LOCATION (t),
 		  "reference type %qT in "
 		  "%<#pragma omp declare reduction%>", argtype);
@@ -13723,7 +13723,7 @@ tsubst_decl (tree t, tree args, tsubst_flags_t complain)
 				  /*constant_expression_p=*/false);
 		if (REFERENCE_REF_P (ve))
 		  {
-		    gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
+		    gcc_assert (TYPE_REF_P (type));
 		    ve = TREE_OPERAND (ve, 0);
 		  }
 		SET_DECL_VALUE_EXPR (r, ve);
@@ -14620,7 +14620,7 @@ tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 	  Core issue 106 says that creating a reference to a reference
 	  during instantiation is no longer a cause for failure. We
 	  only enforce this check in strict C++98 mode.  */
-	if ((TREE_CODE (type) == REFERENCE_TYPE
+	if ((TYPE_REF_P (type)
 	     && (((cxx_dialect == cxx98) && flag_iso) || code != REFERENCE_TYPE))
 	    || (code == REFERENCE_TYPE && VOID_TYPE_P (type)))
 	  {
@@ -14664,7 +14664,7 @@ tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 	    if (TREE_CODE (type) == METHOD_TYPE)
 	      r = build_ptrmemfunc_type (r);
 	  }
-	else if (TREE_CODE (type) == REFERENCE_TYPE)
+	else if (TYPE_REF_P (type))
 	  /* In C++0x, during template argument substitution, when there is an
 	     attempt to create a reference to a reference type, reference
 	     collapsing is applied as described in [14.3.1/4 temp.arg.type]:
@@ -14704,7 +14704,7 @@ tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 	      error ("creating pointer to member of non-class type %qT", r);
 	    return error_mark_node;
 	  }
-	if (TREE_CODE (type) == REFERENCE_TYPE)
+	if (TYPE_REF_P (type))
 	  {
 	    if (complain & tf_error)
 	      error ("creating pointer to member reference type %qT", type);
@@ -14776,7 +14776,7 @@ tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 	    || TREE_CODE (type) == FUNCTION_TYPE
 	    || (TREE_CODE (type) == ARRAY_TYPE
 		&& TYPE_DOMAIN (type) == NULL_TREE)
-	    || TREE_CODE (type) == REFERENCE_TYPE)
+	    || TYPE_REF_P (type))
 	  {
 	    if (complain & tf_error)
 	      error ("creating array of %qT", type);
@@ -18862,7 +18862,7 @@ tsubst_copy_and_build (tree t,
 	else if (outer_automatic_var_p (r))
 	  r = process_outer_var_ref (r, complain);
 
-	if (TREE_CODE (TREE_TYPE (t)) != REFERENCE_TYPE)
+	if (!TYPE_REF_P (TREE_TYPE (t)))
 	  /* If the original type was a reference, we'll be wrapped in
 	     the appropriate INDIRECT_REF.  */
 	  r = convert_from_reference (r);
@@ -19728,11 +19728,11 @@ maybe_adjust_types_for_deduction (unification_kind_t strict,
       /* Core issue #873: Do the DR606 thing (see below) for these cases,
 	 too, but here handle it by stripping the reference from PARM
 	 rather than by adding it to ARG.  */
-      if (TREE_CODE (*parm) == REFERENCE_TYPE
+      if (TYPE_REF_P (*parm)
 	  && TYPE_REF_IS_RVALUE (*parm)
 	  && TREE_CODE (TREE_TYPE (*parm)) == TEMPLATE_TYPE_PARM
 	  && cp_type_quals (TREE_TYPE (*parm)) == TYPE_UNQUALIFIED
-	  && TREE_CODE (*arg) == REFERENCE_TYPE
+	  && TYPE_REF_P (*arg)
 	  && !TYPE_REF_IS_RVALUE (*arg))
 	*parm = TREE_TYPE (*parm);
       /* Nothing else to do in this case.  */
@@ -19742,7 +19742,7 @@ maybe_adjust_types_for_deduction (unification_kind_t strict,
       gcc_unreachable ();
     }
 
-  if (TREE_CODE (*parm) != REFERENCE_TYPE)
+  if (!TYPE_REF_P (*parm))
     {
       /* [temp.deduct.call]
 
@@ -19774,7 +19774,7 @@ maybe_adjust_types_for_deduction (unification_kind_t strict,
      deduction (13.3.1.8)). If P is a forwarding reference and the argument is
      an lvalue, the type "lvalue reference to A" is used in place of A for type
      deduction. */
-  if (TREE_CODE (*parm) == REFERENCE_TYPE
+  if (TYPE_REF_P (*parm)
       && TYPE_REF_IS_RVALUE (*parm)
       && TREE_CODE (TREE_TYPE (*parm)) == TEMPLATE_TYPE_PARM
       && !TEMPLATE_TYPE_PARM_FOR_CLASS (TREE_TYPE (*parm))
@@ -19792,7 +19792,7 @@ maybe_adjust_types_for_deduction (unification_kind_t strict,
      reference type, the type referred to by P is used for
      type deduction.  */
   *parm = TYPE_MAIN_VARIANT (*parm);
-  if (TREE_CODE (*parm) == REFERENCE_TYPE)
+  if (TYPE_REF_P (*parm))
     {
       *parm = TREE_TYPE (*parm);
       result |= UNIFY_ALLOW_OUTER_MORE_CV_QUAL;
@@ -19800,7 +19800,7 @@ maybe_adjust_types_for_deduction (unification_kind_t strict,
 
   /* DR 322. For conversion deduction, remove a reference type on parm
      too (which has been swapped into ARG).  */
-  if (strict == DEDUCE_CONV && TREE_CODE (*arg) == REFERENCE_TYPE)
+  if (strict == DEDUCE_CONV && TYPE_REF_P (*arg))
     *arg = TREE_TYPE (*arg);
 
   return result;
@@ -20937,7 +20937,7 @@ check_cv_quals_for_unify (int strict, tree arg, tree parm)
 	  types are not of the form "cv-list T" [14.8.2.5 temp.deduct.type].
 	  It is ok when we're allowing additional CV qualifiers
 	  at the outer level [14.8.2.1]/3,1st bullet.  */
-      if ((TREE_CODE (arg) == REFERENCE_TYPE
+      if ((TYPE_REF_P (arg)
 	   || TREE_CODE (arg) == FUNCTION_TYPE
 	   || TREE_CODE (arg) == METHOD_TYPE)
 	  && (parm_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE)))
@@ -21744,7 +21744,7 @@ unify (tree tparms, tree targs, tree parm, tree arg, int strict,
       }
 
     case REFERENCE_TYPE:
-      if (TREE_CODE (arg) != REFERENCE_TYPE)
+      if (!TYPE_REF_P (arg))
 	return unify_type_mismatch (explain_p, parm, arg);
       return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg),
 		    strict & UNIFY_ALLOW_MORE_CV_QUAL, explain_p);
@@ -22308,14 +22308,14 @@ more_specialized_fn (tree pat1, tree pat2, int len)
 	  && !uses_deducible_template_parms (arg2))
 	goto next;
 
-      if (TREE_CODE (arg1) == REFERENCE_TYPE)
+      if (TYPE_REF_P (arg1))
 	{
 	  ref1 = TYPE_REF_IS_RVALUE (arg1) + 1;
 	  arg1 = TREE_TYPE (arg1);
 	  quals1 = cp_type_quals (arg1);
 	}
 
-      if (TREE_CODE (arg2) == REFERENCE_TYPE)
+      if (TYPE_REF_P (arg2))
 	{
 	  ref2 = TYPE_REF_IS_RVALUE (arg2) + 1;
 	  arg2 = TREE_TYPE (arg2);
@@ -24400,7 +24400,7 @@ invalid_nontype_parm_type_p (tree type, tsubst_flags_t complain)
     return false;
   else if (TYPE_PTR_P (type))
     return false;
-  else if (TREE_CODE (type) == REFERENCE_TYPE
+  else if (TYPE_REF_P (type)
 	   && !TYPE_REF_IS_RVALUE (type))
     return false;
   else if (TYPE_PTRMEM_P (type))
@@ -24470,7 +24470,7 @@ dependent_type_p_r (tree type)
 	    || dependent_type_p (TYPE_PTRMEM_POINTED_TO_TYPE
 					   (type)));
   else if (TYPE_PTR_P (type)
-	   || TREE_CODE (type) == REFERENCE_TYPE)
+	   || TYPE_REF_P (type))
     return dependent_type_p (TREE_TYPE (type));
   else if (TREE_CODE (type) == FUNCTION_TYPE
 	   || TREE_CODE (type) == METHOD_TYPE)
@@ -24719,7 +24719,7 @@ value_dependent_expression_p (tree expression)
 	  with an expression that is value-dependent.  */
       if (DECL_DEPENDENT_INIT_P (expression)
 	  /* FIXME cp_finish_decl doesn't fold reference initializers.  */
-	  || TREE_CODE (TREE_TYPE (expression)) == REFERENCE_TYPE)
+	  || TYPE_REF_P (TREE_TYPE (expression)))
 	return true;
       if (DECL_HAS_VALUE_EXPR_P (expression))
 	{
@@ -26281,7 +26281,7 @@ build_deduction_guide (tree ctor, tree outer_args, tsubst_flags_t complain)
   if (TYPE_P (ctor))
     {
       type = ctor;
-      bool copy_p = TREE_CODE (type) == REFERENCE_TYPE;
+      bool copy_p = TYPE_REF_P (type);
       if (copy_p)
 	{
 	  type = TREE_TYPE (type);
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index 6557817..94e8f54 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -1334,7 +1334,7 @@ finish_handler_parms (tree decl, tree handler)
       if (warn_catch_value
 	  && type != NULL_TREE
 	  && type != error_mark_node
-	  && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE)
+	  && !TYPE_REF_P (TREE_TYPE (decl)))
 	{
 	  tree orig_type = TREE_TYPE (decl);
 	  if (CLASS_TYPE_P (orig_type))
@@ -1835,7 +1835,7 @@ finish_non_static_data_member (tree decl, tree object, tree qualifying_scope)
     {
       tree type = TREE_TYPE (decl);
 
-      if (TREE_CODE (type) == REFERENCE_TYPE)
+      if (TYPE_REF_P (type))
 	/* Quals on the object don't matter.  */;
       else if (PACK_EXPANSION_P (type))
 	/* Don't bother trying to represent this.  */
@@ -2729,7 +2729,7 @@ finish_compound_literal (tree type, tree compound_literal,
   if (type == error_mark_node)
     return error_mark_node;
 
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     {
       compound_literal
 	= finish_compound_literal (TREE_TYPE (type), compound_literal,
@@ -4465,7 +4465,7 @@ omp_privatize_field (tree t, bool shared)
     return error_mark_node;
   if (!omp_private_member_map && !shared)
     omp_private_member_map = new hash_map<tree, tree>;
-  if (TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE)
+  if (TYPE_REF_P (TREE_TYPE (t)))
     {
       gcc_assert (INDIRECT_REF_P (m));
       m = TREE_OPERAND (m, 0);
@@ -4783,7 +4783,7 @@ handle_omp_array_sections_1 (tree c, tree t, vec<tree> &types,
 	    }
 	}
     }
-  else if (TREE_CODE (type) == POINTER_TYPE)
+  else if (TYPE_PTR_P (type))
     {
       if (length == NULL_TREE)
 	{
@@ -4997,7 +4997,7 @@ handle_omp_array_sections (tree c, enum c_omp_region_type ort)
 		eltype = TREE_TYPE (eltype);
 	      tree type = build_array_type (eltype, index_type);
 	      tree ptype = build_pointer_type (eltype);
-	      if (TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE
+	      if (TYPE_REF_P (TREE_TYPE (t))
 		  && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (t))))
 		t = convert_from_reference (t);
 	      else if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
@@ -5084,7 +5084,7 @@ handle_omp_array_sections (tree c, enum c_omp_region_type ort)
 	  OMP_CLAUSE_CHAIN (c) = c2;
 	  ptr = OMP_CLAUSE_DECL (c2);
 	  if (OMP_CLAUSE_MAP_KIND (c2) != GOMP_MAP_FIRSTPRIVATE_POINTER
-	      && TREE_CODE (TREE_TYPE (ptr)) == REFERENCE_TYPE
+	      && TYPE_REF_P (TREE_TYPE (ptr))
 	      && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (ptr))))
 	    {
 	      tree c3 = build_omp_clause (OMP_CLAUSE_LOCATION (c),
@@ -5351,7 +5351,7 @@ void
 cp_check_omp_declare_reduction (tree udr)
 {
   tree type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (udr)));
-  gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
+  gcc_assert (TYPE_REF_P (type));
   type = TREE_TYPE (type);
   int i;
   location_t loc = DECL_SOURCE_LOCATION (udr);
@@ -5402,7 +5402,7 @@ cp_check_omp_declare_reduction (tree udr)
 		     "%<#pragma omp declare reduction%>", type);
       return;
     }
-  else if (TREE_CODE (type) == REFERENCE_TYPE)
+  else if (TYPE_REF_P (type))
     {
       error_at (loc, "reference type %qT in %<#pragma omp declare reduction%>",
 		type);
@@ -5511,7 +5511,7 @@ finish_omp_reduction_clause (tree c, bool *need_default_ctor, bool *need_dtor)
   tree type = TREE_TYPE (t);
   if (TREE_CODE (t) == MEM_REF)
     type = TREE_TYPE (type);
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     type = TREE_TYPE (type);
   if (TREE_CODE (type) == ARRAY_TYPE)
     {
@@ -5651,8 +5651,7 @@ finish_omp_reduction_clause (tree c, bool *need_default_ctor, bool *need_dtor)
 	      if (TREE_ADDRESSABLE (DECL_EXPR_DECL (stmts[0])))
 		cxx_mark_addressable (placeholder);
 	      if (TREE_ADDRESSABLE (DECL_EXPR_DECL (stmts[1]))
-		  && TREE_CODE (TREE_TYPE (OMP_CLAUSE_DECL (c)))
-		     != REFERENCE_TYPE)
+		  && !TYPE_REF_P (TREE_TYPE (OMP_CLAUSE_DECL (c))))
 		cxx_mark_addressable (decl_placeholder ? decl_placeholder
 				      : OMP_CLAUSE_DECL (c));
 	      tree omp_out = placeholder;
@@ -5770,8 +5769,7 @@ finish_omp_declare_simd_methods (tree t)
 	if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_LINEAR
 	    && integer_zerop (OMP_CLAUSE_DECL (c))
 	    && OMP_CLAUSE_LINEAR_STEP (c)
-	    && TREE_CODE (TREE_TYPE (OMP_CLAUSE_LINEAR_STEP (c)))
-	       == POINTER_TYPE)
+	    && TYPE_PTR_P (TREE_TYPE (OMP_CLAUSE_LINEAR_STEP (c))))
 	  {
 	    tree s = OMP_CLAUSE_LINEAR_STEP (c);
 	    s = fold_convert_loc (OMP_CLAUSE_LOCATION (c), sizetype, s);
@@ -5800,7 +5798,7 @@ cp_finish_omp_clause_depend_sink (tree sink_clause)
   for (; t; t = TREE_CHAIN (t))
     {
       tree decl = TREE_VALUE (t);
-      if (TREE_CODE (TREE_TYPE (decl)) == POINTER_TYPE)
+      if (TYPE_PTR_P (TREE_TYPE (decl)))
 	{
 	  tree offset = TREE_PURPOSE (t);
 	  bool neg = wi::neg_p (wi::to_wide (offset));
@@ -5923,7 +5921,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	      tree type = TREE_TYPE (t);
 	      if ((OMP_CLAUSE_LINEAR_KIND (c) == OMP_CLAUSE_LINEAR_REF
 		   || OMP_CLAUSE_LINEAR_KIND (c) == OMP_CLAUSE_LINEAR_UVAL)
-		  && TREE_CODE (type) != REFERENCE_TYPE)
+		  && !TYPE_REF_P (type))
 		{
 		  error ("linear clause with %qs modifier applied to "
 			 "non-reference variable with %qT type",
@@ -5932,12 +5930,12 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 		  remove = true;
 		  break;
 		}
-	      if (TREE_CODE (type) == REFERENCE_TYPE)
+	      if (TYPE_REF_P (type))
 		type = TREE_TYPE (type);
 	      if (OMP_CLAUSE_LINEAR_KIND (c) != OMP_CLAUSE_LINEAR_REF)
 		{
 		  if (!INTEGRAL_TYPE_P (type)
-		      && TREE_CODE (type) != POINTER_TYPE)
+		      && !TYPE_PTR_P (type))
 		    {
 		      error ("linear clause applied to non-integral non-pointer"
 			     " variable with %qT type", TREE_TYPE (t));
@@ -5958,7 +5956,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 		   && !INTEGRAL_TYPE_P (TREE_TYPE (t))
 		   && (ort != C_ORT_OMP_DECLARE_SIMD
 		       || TREE_CODE (t) != PARM_DECL
-		       || TREE_CODE (TREE_TYPE (t)) != REFERENCE_TYPE
+		       || !TYPE_REF_P (TREE_TYPE (t))
 		       || !INTEGRAL_TYPE_P (TREE_TYPE (TREE_TYPE (t)))))
 	    {
 	      error ("linear step expression must be integral");
@@ -5991,7 +5989,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 		    }
 		  t = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
 		  tree type = TREE_TYPE (OMP_CLAUSE_DECL (c));
-		  if (TREE_CODE (type) == REFERENCE_TYPE)
+		  if (TYPE_REF_P (type))
 		    type = TREE_TYPE (type);
 		  if (OMP_CLAUSE_LINEAR_KIND (c) == OMP_CLAUSE_LINEAR_REF)
 		    {
@@ -6009,7 +6007,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 			  break;
 			}
 		    }
-		  else if (TREE_CODE (type) == POINTER_TYPE
+		  else if (TYPE_PTR_P (type)
 			   /* Can't multiply the step yet if *this
 			      is still incomplete type.  */
 			   && (ort != C_ORT_OMP_DECLARE_SIMD
@@ -6533,9 +6531,9 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	      remove = true;
 	    }
 	  else if (!type_dependent_expression_p (t)
-		   && TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE
+		   && !TYPE_PTR_P (TREE_TYPE (t))
 		   && TREE_CODE (TREE_TYPE (t)) != ARRAY_TYPE
-		   && (TREE_CODE (TREE_TYPE (t)) != REFERENCE_TYPE
+		   && (!TYPE_REF_P (TREE_TYPE (t))
 		       || (!POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (t)))
 			   && (TREE_CODE (TREE_TYPE (TREE_TYPE (t)))
 			       != ARRAY_TYPE))))
@@ -6765,7 +6763,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	      break;
 	    }
 	  else if (!processing_template_decl
-		   && TREE_CODE (TREE_TYPE (t)) != REFERENCE_TYPE
+		   && !TYPE_REF_P (TREE_TYPE (t))
 		   && (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_MAP
 		       || (OMP_CLAUSE_MAP_KIND (c)
 			   != GOMP_MAP_FIRSTPRIVATE_POINTER))
@@ -6777,8 +6775,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 			     == GOMP_MAP_FIRSTPRIVATE_POINTER)))
 		   && t == OMP_CLAUSE_DECL (c)
 		   && !type_dependent_expression_p (t)
-		   && !cp_omp_mappable_type ((TREE_CODE (TREE_TYPE (t))
-					      == REFERENCE_TYPE)
+		   && !cp_omp_mappable_type (TYPE_REF_P (TREE_TYPE (t))
 					     ? TREE_TYPE (TREE_TYPE (t))
 					     : TREE_TYPE (t)))
 	    {
@@ -6845,7 +6842,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	  if (!remove
 	      && !processing_template_decl
 	      && (ort & C_ORT_OMP_DECLARE_SIMD) == C_ORT_OMP
-	      && TREE_CODE (TREE_TYPE (OMP_CLAUSE_DECL (c))) == REFERENCE_TYPE)
+	      && TYPE_REF_P (TREE_TYPE (OMP_CLAUSE_DECL (c))))
 	    {
 	      t = OMP_CLAUSE_DECL (c);
 	      if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_MAP)
@@ -7043,10 +7040,10 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	  if (!type_dependent_expression_p (t))
 	    {
 	      tree type = TREE_TYPE (t);
-	      if (TREE_CODE (type) != POINTER_TYPE
+	      if (!TYPE_PTR_P (type)
 		  && TREE_CODE (type) != ARRAY_TYPE
-		  && (TREE_CODE (type) != REFERENCE_TYPE
-		      || (TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
+		  && (!TYPE_REF_P (type)
+		      || (!TYPE_PTR_P (TREE_TYPE (type))
 			  && TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE)))
 		{
 		  error_at (OMP_CLAUSE_LOCATION (c),
@@ -7287,7 +7284,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	  t = require_complete_type (t);
 	  if (t == error_mark_node)
 	    remove = true;
-	  else if (TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE
+	  else if (TYPE_REF_P (TREE_TYPE (t))
 		   && !complete_type_or_else (TREE_TYPE (TREE_TYPE (t)), t))
 	    remove = true;
 	}
@@ -7328,7 +7325,7 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
       if ((need_complete_type
 	   || need_copy_assignment
 	   || OMP_CLAUSE_CODE (c) == OMP_CLAUSE_REDUCTION)
-	  && TREE_CODE (inner_type) == REFERENCE_TYPE)
+	  && TYPE_REF_P (inner_type))
 	inner_type = TREE_TYPE (inner_type);
       while (TREE_CODE (inner_type) == ARRAY_TYPE)
 	inner_type = TREE_TYPE (inner_type);
@@ -8878,7 +8875,7 @@ finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
 	     decltype(e) is defined as T&; if an xvalue, T&&; otherwise, T. */
 	  cp_lvalue_kind clk = lvalue_kind (expr);
 	  type = unlowered_expr_type (expr);
-	  gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
+	  gcc_assert (!TYPE_REF_P (type));
 
 	  /* For vector types, pick a non-opaque variant.  */
 	  if (VECTOR_TYPE_P (type))
@@ -9258,14 +9255,14 @@ capture_decltype (tree decl)
 
       case CPLD_COPY:
 	type = TREE_TYPE (decl);
-	if (TREE_CODE (type) == REFERENCE_TYPE
+	if (TYPE_REF_P (type)
 	    && TREE_CODE (TREE_TYPE (type)) != FUNCTION_TYPE)
 	  type = TREE_TYPE (type);
 	break;
 
       case CPLD_REFERENCE:
 	type = TREE_TYPE (decl);
-	if (TREE_CODE (type) != REFERENCE_TYPE)
+	if (!TYPE_REF_P (type))
 	  type = build_reference_type (TREE_TYPE (decl));
 	break;
 
@@ -9273,7 +9270,7 @@ capture_decltype (tree decl)
 	gcc_unreachable ();
       }
 
-  if (TREE_CODE (type) != REFERENCE_TYPE)
+  if (!TYPE_REF_P (type))
     {
       if (!LAMBDA_EXPR_MUTABLE_P (lam))
 	type = cp_build_qualified_type (type, (cp_type_quals (type)
@@ -9363,7 +9360,7 @@ finish_builtin_launder (location_t loc, tree arg, tsubst_flags_t complain)
   if (error_operand_p (arg))
     return error_mark_node;
   if (!type_dependent_expression_p (arg)
-      && TREE_CODE (TREE_TYPE (arg)) != POINTER_TYPE)
+      && !TYPE_PTR_P (TREE_TYPE (arg)))
     {
       error_at (loc, "non-pointer argument to %<__builtin_launder%>");
       return error_mark_node;
diff --git a/gcc/cp/tree.c b/gcc/cp/tree.c
index 313ff90..b2efab6 100644
--- a/gcc/cp/tree.c
+++ b/gcc/cp/tree.c
@@ -65,7 +65,7 @@ lvalue_kind (const_tree ref)
     return lvalue_kind (TREE_OPERAND (ref, 0));
 
   if (TREE_TYPE (ref)
-      && TREE_CODE (TREE_TYPE (ref)) == REFERENCE_TYPE)
+      && TYPE_REF_P (TREE_TYPE (ref)))
     {
       /* unnamed rvalue references are rvalues */
       if (TYPE_REF_IS_RVALUE (TREE_TYPE (ref))
@@ -1100,7 +1100,7 @@ cp_build_reference_type (tree to_type, bool rval)
   if (to_type == error_mark_node)
     return error_mark_node;
 
-  if (TREE_CODE (to_type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (to_type))
     {
       rval = rval && TYPE_REF_IS_RVALUE (to_type);
       to_type = TREE_TYPE (to_type);
@@ -1148,7 +1148,7 @@ tree
 move (tree expr)
 {
   tree type = TREE_TYPE (expr);
-  gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
+  gcc_assert (!TYPE_REF_P (type));
   type = cp_build_reference_type (type, /*rval*/true);
   return build_static_cast (type, expr, tf_warning_or_error);
 }
@@ -1260,11 +1260,11 @@ cp_build_qualified_type_real (tree type,
      [dcl.ref], [dcl.fct].  This used to be an error, but as of DR 295
      (in CD1) we always ignore extra cv-quals on functions.  */
   if (type_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE)
-      && (TREE_CODE (type) == REFERENCE_TYPE
+      && (TYPE_REF_P (type)
 	  || TREE_CODE (type) == FUNCTION_TYPE
 	  || TREE_CODE (type) == METHOD_TYPE))
     {
-      if (TREE_CODE (type) == REFERENCE_TYPE)
+      if (TYPE_REF_P (type))
 	bad_quals |= type_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE);
       type_quals &= ~(TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE);
     }
@@ -5126,7 +5126,7 @@ stabilize_expr (tree exp, tree* initp)
     }
   /* There are no expressions with REFERENCE_TYPE, but there can be call
      arguments with such a type; just treat it as a pointer.  */
-  else if (TREE_CODE (TREE_TYPE (exp)) == REFERENCE_TYPE
+  else if (TYPE_REF_P (TREE_TYPE (exp))
 	   || SCALAR_TYPE_P (TREE_TYPE (exp))
 	   || !glvalue_p (exp))
     {
@@ -5287,7 +5287,7 @@ stabilize_init (tree init, tree *initp)
 	{
 	  tree type = TREE_TYPE (ce->value);
 	  tree subinit;
-	  if (TREE_CODE (type) == REFERENCE_TYPE
+	  if (TYPE_REF_P (type)
 	      || SCALAR_TYPE_P (type))
 	    ce->value = stabilize_expr (ce->value, &subinit);
 	  else if (!stabilize_init (ce->value, &subinit))
diff --git a/gcc/cp/typeck.c b/gcc/cp/typeck.c
index 05ae00e..e5eb35d 100644
--- a/gcc/cp/typeck.c
+++ b/gcc/cp/typeck.c
@@ -1181,8 +1181,8 @@ cxx_safe_arg_type_equiv_p (tree t1, tree t2)
   t1 = TYPE_MAIN_VARIANT (t1);
   t2 = TYPE_MAIN_VARIANT (t2);
 
-  if (TREE_CODE (t1) == POINTER_TYPE
-      && TREE_CODE (t2) == POINTER_TYPE)
+  if (TYPE_PTR_P (t1)
+      && TYPE_PTR_P (t2))
     return true;
 
   /* The signedness of the parameter matters only when an integral
@@ -2509,7 +2509,7 @@ build_class_member_access_expr (cp_expr object, tree member,
       /* Compute the type of the field, as described in [expr.ref].  */
       type_quals = TYPE_UNQUALIFIED;
       member_type = TREE_TYPE (member);
-      if (TREE_CODE (member_type) != REFERENCE_TYPE)
+      if (!TYPE_REF_P (member_type))
 	{
 	  type_quals = (cp_type_quals (member_type)
 			| cp_type_quals (object_type));
@@ -3131,7 +3131,7 @@ cp_build_indirect_ref_1 (tree ptr, ref_operator errorstring,
 	      (TREE_TYPE (ptr), TREE_TYPE (current_class_ptr)))))
     return current_class_ref;
 
-  pointer = (TREE_CODE (TREE_TYPE (ptr)) == REFERENCE_TYPE
+  pointer = (TYPE_REF_P (TREE_TYPE (ptr))
 	     ? ptr : decay_conversion (ptr, complain));
   if (pointer == error_mark_node)
     return error_mark_node;
@@ -3901,10 +3901,10 @@ convert_arguments (tree typelist, vec<tree, va_gc> **values, tree fndecl,
 	 Strip such NOP_EXPRs, since VAL is used in non-lvalue context.  */
       if (TREE_CODE (val) == NOP_EXPR
 	  && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0))
-	  && (type == 0 || TREE_CODE (type) != REFERENCE_TYPE))
+	  && (type == 0 || !TYPE_REF_P (type)))
 	val = TREE_OPERAND (val, 0);
 
-      if (type == 0 || TREE_CODE (type) != REFERENCE_TYPE)
+      if (type == 0 || !TYPE_REF_P (type))
 	{
 	  if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE
 	      || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE
@@ -4176,7 +4176,7 @@ warn_for_null_address (location_t location, tree op, tsubst_flags_t complain)
 		"be NULL", TREE_OPERAND (cop, 0));
 
   if (CONVERT_EXPR_P (op)
-      && TREE_CODE (TREE_TYPE (TREE_OPERAND (op, 0))) == REFERENCE_TYPE)
+      && TYPE_REF_P (TREE_TYPE (TREE_OPERAND (op, 0))))
     {
       tree inner_op = op;
       STRIP_NOPS (inner_op);
@@ -5876,7 +5876,7 @@ cp_build_addr_expr_1 (tree arg, bool strict_lvalue, tsubst_flags_t complain)
 	}
     }
 
-  if (TREE_CODE (argtype) == REFERENCE_TYPE)
+  if (TYPE_REF_P (argtype))
     {
       tree type = build_pointer_type (TREE_TYPE (argtype));
       arg = build1 (CONVERT_EXPR, type, arg);
@@ -5898,7 +5898,7 @@ cp_build_addr_expr_1 (tree arg, bool strict_lvalue, tsubst_flags_t complain)
   if (INDIRECT_REF_P (arg))
     {
       arg = TREE_OPERAND (arg, 0);
-      if (TREE_CODE (TREE_TYPE (arg)) == REFERENCE_TYPE)
+      if (TYPE_REF_P (TREE_TYPE (arg)))
 	{
 	  tree type = build_pointer_type (TREE_TYPE (TREE_TYPE (arg)));
 	  arg = build1 (CONVERT_EXPR, type, arg);
@@ -5943,7 +5943,7 @@ cp_build_addr_expr_1 (tree arg, bool strict_lvalue, tsubst_flags_t complain)
 	gcc_assert (PTRMEM_OK_P (arg));
 
 	t = TREE_OPERAND (arg, 1);
-	if (TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE)
+	if (TYPE_REF_P (TREE_TYPE (t)))
 	  {
 	    if (complain & tf_error)
 	      error ("cannot create pointer to reference member %qD", t);
@@ -6805,7 +6805,7 @@ maybe_warn_about_useless_cast (tree type, tree expr, tsubst_flags_t complain)
   if (warn_useless_cast
       && complain & tf_warning)
     {
-      if ((TREE_CODE (type) == REFERENCE_TYPE
+      if ((TYPE_REF_P (type)
 	   && (TYPE_REF_IS_RVALUE (type)
 	       ? xvalue_p (expr) : lvalue_p (expr))
 	   && same_type_p (TREE_TYPE (expr), TREE_TYPE (type)))
@@ -6922,7 +6922,7 @@ build_static_cast_1 (tree type, tree expr, bool c_cast_p,
      we want to avoid constructing a new D.  The standard is not
      completely clear about this issue, but our interpretation is
      consistent with other compilers.  */
-  if (TREE_CODE (type) == REFERENCE_TYPE
+  if (TYPE_REF_P (type)
       && CLASS_TYPE_P (TREE_TYPE (type))
       && CLASS_TYPE_P (intype)
       && (TYPE_REF_IS_RVALUE (type) || lvalue_p (expr))
@@ -6991,7 +6991,7 @@ build_static_cast_1 (tree type, tree expr, bool c_cast_p,
 
   /* "A glvalue of type cv1 T1 can be cast to type rvalue reference to
      cv2 T2 if cv2 T2 is reference-compatible with cv1 T1 (8.5.3)."  */
-  if (TREE_CODE (type) == REFERENCE_TYPE
+  if (TYPE_REF_P (type)
       && TYPE_REF_IS_RVALUE (type)
       && (clk = real_lvalue_p (expr))
       && reference_related_p (TREE_TYPE (type), intype)
@@ -7055,7 +7055,7 @@ build_static_cast_1 (tree type, tree expr, bool c_cast_p,
 
 	 If T is a reference type, the result is an lvalue; otherwise,
 	 the result is an rvalue.  */
-      if (TREE_CODE (type) != REFERENCE_TYPE)
+      if (!TYPE_REF_P (type))
 	{
 	  result = rvalue (result);
 
@@ -7221,7 +7221,7 @@ build_static_cast (tree type, tree oexpr, tsubst_flags_t complain)
 
   /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
      Strip such NOP_EXPRs if VALUE is being used in non-lvalue context.  */
-  if (TREE_CODE (type) != REFERENCE_TYPE
+  if (!TYPE_REF_P (type)
       && TREE_CODE (expr) == NOP_EXPR
       && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0)))
     expr = TREE_OPERAND (expr, 0);
@@ -7330,7 +7330,7 @@ build_reinterpret_cast_1 (tree type, tree expr, bool c_cast_p,
      "reference to T2" if an expression of type "pointer to T1" can be
      explicitly converted to the type "pointer to T2" using a
      reinterpret_cast.  */
-  if (TREE_CODE (type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (type))
     {
       if (! lvalue_p (expr))
 	{
@@ -7582,7 +7582,7 @@ build_const_cast_1 (tree dst_type, tree expr, tsubst_flags_t complain,
 
   src_type = TREE_TYPE (expr);
   /* Expressions do not really have reference types.  */
-  if (TREE_CODE (src_type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (src_type))
     src_type = TREE_TYPE (src_type);
 
   /* [expr.const.cast]
@@ -7600,7 +7600,7 @@ build_const_cast_1 (tree dst_type, tree expr, tsubst_flags_t complain,
      -- if T1 is a class type, a prvalue of type T1 can be explicitly
      converted to an xvalue of type T2 using the cast const_cast<T2&&>.  */
 
-  if (TREE_CODE (dst_type) == REFERENCE_TYPE)
+  if (TYPE_REF_P (dst_type))
     {
       reference_type = dst_type;
       if (!TYPE_REF_IS_RVALUE (dst_type)
@@ -7763,7 +7763,7 @@ cp_build_c_cast (tree type, tree expr, tsubst_flags_t complain)
 
   /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
      Strip such NOP_EXPRs if VALUE is being used in non-lvalue context.  */
-  if (TREE_CODE (type) != REFERENCE_TYPE
+  if (!TYPE_REF_P (type)
       && TREE_CODE (value) == NOP_EXPR
       && TREE_TYPE (value) == TREE_TYPE (TREE_OPERAND (value, 0)))
     value = TREE_OPERAND (value, 0);
@@ -7841,7 +7841,7 @@ cp_build_c_cast (tree type, tree expr, tsubst_flags_t complain)
       if (!CLASS_TYPE_P (type))
 	type = TYPE_MAIN_VARIANT (type);
       result_type = TREE_TYPE (result);
-      if (!CLASS_TYPE_P (result_type) && TREE_CODE (type) != REFERENCE_TYPE)
+      if (!CLASS_TYPE_P (result_type) && !TYPE_REF_P (type))
 	result_type = TYPE_MAIN_VARIANT (result_type);
       /* If the type of RESULT does not match TYPE, perform a
 	 const_cast to make it match.  If the static_cast or
@@ -8083,7 +8083,7 @@ cp_build_modify_expr (location_t loc, tree lhs, enum tree_code modifycode,
 	  /* A binary op has been requested.  Combine the old LHS
 	     value with the RHS producing the value we should actually
 	     store into the LHS.  */
-	  gcc_assert (!((TREE_CODE (lhstype) == REFERENCE_TYPE
+	  gcc_assert (!((TYPE_REF_P (lhstype)
 			 && MAYBE_CLASS_TYPE_P (TREE_TYPE (lhstype)))
 			|| MAYBE_CLASS_TYPE_P (lhstype)));
 
@@ -8122,8 +8122,8 @@ cp_build_modify_expr (location_t loc, tree lhs, enum tree_code modifycode,
 		goto ret;
 	    }
 	}
-      gcc_assert (TREE_CODE (lhstype) != REFERENCE_TYPE);
-      gcc_assert (TREE_CODE (TREE_TYPE (newrhs)) != REFERENCE_TYPE);
+      gcc_assert (!TYPE_REF_P (lhstype));
+      gcc_assert (!TYPE_REF_P (TREE_TYPE (newrhs)));
     }
 
   /* The left-hand side must be an lvalue.  */
@@ -8955,7 +8955,7 @@ convert_for_initialization (tree exp, tree type, tree rhs, int flags,
     ;
   else if ((TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE
 	    && TREE_CODE (type) != ARRAY_TYPE
-	    && (TREE_CODE (type) != REFERENCE_TYPE
+	    && (!TYPE_REF_P (type)
 		|| TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE))
 	   || (TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE
 	       && !TYPE_REFFN_P (type))
@@ -9037,7 +9037,7 @@ maybe_warn_about_returning_address_of_local (tree retval)
 	 || TREE_CODE (whats_returned) == ARRAY_REF)
     whats_returned = TREE_OPERAND (whats_returned, 0);
 
-  if (TREE_CODE (valtype) == REFERENCE_TYPE)
+  if (TYPE_REF_P (valtype))
     {
       if (TREE_CODE (whats_returned) == AGGR_INIT_EXPR
 	  || TREE_CODE (whats_returned) == TARGET_EXPR)
@@ -9061,7 +9061,7 @@ maybe_warn_about_returning_address_of_local (tree retval)
       && !(TREE_STATIC (whats_returned)
 	   || TREE_PUBLIC (whats_returned)))
     {
-      if (TREE_CODE (valtype) == REFERENCE_TYPE)
+      if (TYPE_REF_P (valtype))
 	warning_at (DECL_SOURCE_LOCATION (whats_returned),
 		    OPT_Wreturn_local_addr,
 		    "reference to local variable %qD returned",
@@ -9263,7 +9263,7 @@ check_return_expr (tree retval, bool *no_warning)
 
       /* The function return type must be a reference to the current
 	class.  */
-      if (TREE_CODE (valtype) == REFERENCE_TYPE
+      if (TYPE_REF_P (valtype)
 	  && same_type_ignoring_top_level_qualifiers_p
 	      (TREE_TYPE (valtype), TREE_TYPE (current_class_ref)))
 	{
@@ -9614,7 +9614,7 @@ cp_type_quals (const_tree type)
   quals = TYPE_QUALS (type);
   /* METHOD and REFERENCE_TYPEs should never have quals.  */
   gcc_assert ((TREE_CODE (type) != METHOD_TYPE
-	       && TREE_CODE (type) != REFERENCE_TYPE)
+	       && !TYPE_REF_P (type))
 	      || ((quals & (TYPE_QUAL_CONST|TYPE_QUAL_VOLATILE))
 		  == TYPE_UNQUALIFIED));
   return quals;
@@ -9801,7 +9801,7 @@ casts_away_constness_r (tree *t1, tree *t2, tsubst_flags_t complain)
 static bool
 casts_away_constness (tree t1, tree t2, tsubst_flags_t complain)
 {
-  if (TREE_CODE (t2) == REFERENCE_TYPE)
+  if (TYPE_REF_P (t2))
     {
       /* [expr.const.cast]
 
@@ -9809,7 +9809,7 @@ casts_away_constness (tree t1, tree t2, tsubst_flags_t complain)
 	 using a reference cast casts away constness if a cast from an
 	 rvalue of type "pointer to T1" to the type "pointer to T2"
 	 casts away constness.  */
-      t1 = (TREE_CODE (t1) == REFERENCE_TYPE ? TREE_TYPE (t1) : t1);
+      t1 = (TYPE_REF_P (t1) ? TREE_TYPE (t1) : t1);
       return casts_away_constness (build_pointer_type (t1),
 				   build_pointer_type (TREE_TYPE (t2)),
 				   complain);
@@ -9849,7 +9849,7 @@ casts_away_constness (tree t1, tree t2, tsubst_flags_t complain)
 tree
 non_reference (tree t)
 {
-  if (t && TREE_CODE (t) == REFERENCE_TYPE)
+  if (t && TYPE_REF_P (t))
     t = TREE_TYPE (t);
   return t;
 }
diff --git a/gcc/cp/typeck2.c b/gcc/cp/typeck2.c
index 444ebfd..682303a 100644
--- a/gcc/cp/typeck2.c
+++ b/gcc/cp/typeck2.c
@@ -111,7 +111,7 @@ cxx_readonly_error (tree arg, enum lvalue_use errstring)
 			     "constant field %qD"),
 			  arg);
   else if (INDIRECT_REF_P (arg)
-	   && TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0))) == REFERENCE_TYPE
+	   && TYPE_REF_P (TREE_TYPE (TREE_OPERAND (arg, 0)))
 	   && (VAR_P (TREE_OPERAND (arg, 0))
 	       || TREE_CODE (TREE_OPERAND (arg, 0)) == PARM_DECL))
     ERROR_FOR_ASSIGNMENT (G_("assignment of "
@@ -845,7 +845,7 @@ store_init_value (tree decl, tree init, vec<tree, va_gc>** cleanups, int flags)
 		    || error_operand_p (value));
       DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = const_init;
       /* FIXME setting TREE_CONSTANT on refs breaks the back end.  */
-      if (TREE_CODE (type) != REFERENCE_TYPE)
+      if (!TYPE_REF_P (type))
 	TREE_CONSTANT (decl) = const_init && decl_maybe_constant_var_p (decl);
     }
   value = cp_fully_fold (value);
@@ -1498,7 +1498,7 @@ process_init_constructor_record (tree type, tree init, int nested,
       else
 	{
 	  const_tree fldtype = TREE_TYPE (field);
-	  if (TREE_CODE (fldtype) == REFERENCE_TYPE)
+	  if (TYPE_REF_P (fldtype))
 	    {
 	      if (complain & tf_error)
 		error ("member %qD is uninitialized reference", field);
@@ -1823,7 +1823,7 @@ build_x_arrow (location_t loc, tree expr, tsubst_flags_t complain)
 
   if (processing_template_decl)
     {
-      if (type && TREE_CODE (type) == POINTER_TYPE
+      if (type && TYPE_PTR_P (type)
 	  && !dependent_scope_p (TREE_TYPE (type)))
 	/* Pointer to current instantiation, don't treat as dependent.  */;
       else if (type_dependent_expression_p (expr))
@@ -1873,7 +1873,7 @@ build_x_arrow (location_t loc, tree expr, tsubst_flags_t complain)
 	  return error_mark_node;
 	}
 
-      if (TREE_CODE (TREE_TYPE (last_rval)) == REFERENCE_TYPE)
+      if (TYPE_REF_P (TREE_TYPE (last_rval)))
 	last_rval = convert_from_reference (last_rval);
     }
   else
@@ -2108,7 +2108,7 @@ build_functional_cast (tree exp, tree parms, tsubst_flags_t complain)
       /* Diagnose this even in a template.  We could also try harder
 	 to give all the usual errors when the type and args are
 	 non-dependent...  */
-      if (TREE_CODE (type) == REFERENCE_TYPE && !parms)
+      if (TYPE_REF_P (type) && !parms)
 	{
 	  if (complain & tf_error)
 	    error ("invalid value-initialization of reference type");
@@ -2206,7 +2206,7 @@ add_exception_specifier (tree list, tree spec, int complain)
      incomplete, or pointer or ref to incomplete other than pointer
      to cv void.  */
   is_ptr = TYPE_PTR_P (core);
-  if (is_ptr || TREE_CODE (core) == REFERENCE_TYPE)
+  if (is_ptr || TYPE_REF_P (core))
     core = TREE_TYPE (core);
   if (complain < 0)
     ok = true;