pt.c (tsubst_copy_and_build): Remove unnecessary COMPONENT_REF peeking.

	* pt.c (tsubst_copy_and_build): Remove unnecessary COMPONENT_REF
	peeking.
	* semantics.c (finish_id_expression): Directly init local var.
	(finish_omp_reduction_clause): Use really_overloaded_fn.
	* tree.c (get_fns): Document.  Assert we got an overload.
	(get_first_fn) Document.
	* typeck.c (cp_build_addr_expr_1): Pass arg directly to
	really_overloaded_fn.
	* typeck2.c (cxx_inomplete_type_diagnostic): Use get_first_fn directly.

From-SVN: r248106

gcc/cp/ChangeLog

 2017-05-16  Nathan Sidwell  <nathan@acm.org>
 
+	* pt.c (tsubst_copy_and_build): Remove unnecessary COMPONENT_REF
+	peeking.
+	* semantics.c (finish_id_expression): Directly init local var.
+	(finish_omp_reduction_clause): Use really_overloaded_fn.
+	* tree.c (get_fns): Document.  Assert we got an overload.
+	(get_first_fn) Document.
+	* typeck.c (cp_build_addr_expr_1): Pass arg directly to
+	really_overloaded_fn.
+	* typeck2.c (cxx_inomplete_type_diagnostic): Use get_first_fn directly.
+
 	* cp-tree.h (SCOPE_DEPTH): New.
 	* name-lookup.h (is_nested_namespace): Declare.
 	* name-lookup.c (is_nested_namespace): New.

gcc/cp/pt.c

@@ -17187,10 +17187,9 @@ tsubst_copy_and_build (tree t,
 		    if (diag)
 		      {
 			tree fn = unq;
+
 			if (INDIRECT_REF_P (fn))
 			  fn = TREE_OPERAND (fn, 0);
-			if (TREE_CODE (fn) == COMPONENT_REF)
-			  fn = TREE_OPERAND (fn, 1);
 			if (is_overloaded_fn (fn))
 			  fn = get_first_fn (fn);
 

gcc/cp/semantics.c

@@ -3749,9 +3749,8 @@ finish_id_expression (tree id_expression,
 	}
       else if (is_overloaded_fn (decl))
 	{
-	  tree first_fn;
+	  tree first_fn = get_first_fn (decl);
 
-	  first_fn = get_first_fn (decl);
 	  if (TREE_CODE (first_fn) == TEMPLATE_DECL)
 	    first_fn = DECL_TEMPLATE_RESULT (first_fn);
 
@@ -5615,7 +5614,6 @@ finish_omp_reduction_clause (tree c, bool *need_default_ctor, bool *need_dtor)
     {
       if (id == error_mark_node)
 	return true;
-      id = OVL_CURRENT (id);
       mark_used (id);
       tree body = DECL_SAVED_TREE (id);
       if (!body)
@@ -6924,13 +6922,13 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	    {
 	      if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_TO_DECLARE)
 		{
-		  if (TREE_CODE (t) == OVERLOAD && OVL_CHAIN (t))
+		  if (TREE_CODE (t) == TEMPLATE_ID_EXPR)
 		    error_at (OMP_CLAUSE_LOCATION (c),
-			      "overloaded function name %qE in clause %qs", t,
+			      "template %qE in clause %qs", t,
 			      omp_clause_code_name[OMP_CLAUSE_CODE (c)]);
-		  else if (TREE_CODE (t) == TEMPLATE_ID_EXPR)
+		  else if (really_overloaded_fn (t))
 		    error_at (OMP_CLAUSE_LOCATION (c),
-			      "template %qE in clause %qs", t,
+			      "overloaded function name %qE in clause %qs", t,
 			      omp_clause_code_name[OMP_CLAUSE_CODE (c)]);
 		  else
 		    error_at (OMP_CLAUSE_LOCATION (c),

gcc/cp/tree.c

@@ -2146,10 +2146,11 @@ really_overloaded_fn (tree x)
   return is_overloaded_fn (x) == 2;
 }
 
+/* Get the overload set FROM refers to.  */
+
 tree
 get_fns (tree from)
 {
-  gcc_assert (is_overloaded_fn (from));
   /* A baselink is also considered an overloaded function.  */
   if (TREE_CODE (from) == OFFSET_REF
       || TREE_CODE (from) == COMPONENT_REF)
@@ -2158,9 +2159,13 @@ get_fns (tree from)
     from = BASELINK_FUNCTIONS (from);
   if (TREE_CODE (from) == TEMPLATE_ID_EXPR)
     from = TREE_OPERAND (from, 0);
+  gcc_assert (TREE_CODE (from) == OVERLOAD
+	      || TREE_CODE (from) == FUNCTION_DECL);
   return from;
 }
 
+/* Return the first function of the overload set FROM refers to.  */
+
 tree
 get_first_fn (tree from)
 {

gcc/cp/typeck.c

@@ -5603,7 +5603,7 @@ cp_build_addr_expr_1 (tree arg, bool strict_lvalue, tsubst_flags_t complain)
   gcc_assert (!identifier_p (arg) || !IDENTIFIER_OPNAME_P (arg));
 
   if (TREE_CODE (arg) == COMPONENT_REF && type_unknown_p (arg)
-      && !really_overloaded_fn (TREE_OPERAND (arg, 1)))
+      && !really_overloaded_fn (arg))
     {
       /* They're trying to take the address of a unique non-static
 	 member function.  This is ill-formed (except in MS-land),

gcc/cp/typeck2.c

@@ -506,9 +506,8 @@ cxx_incomplete_type_diagnostic (location_t loc, const_tree value,
     case OFFSET_TYPE:
     bad_member:
       {
-	tree member = TREE_OPERAND (value, 1);
-	if (is_overloaded_fn (member))
-	  member = get_first_fn (member);
+	tree member = get_first_fn (TREE_OPERAND (value, 1));
+
 	if (DECL_FUNCTION_MEMBER_P (member)
 	    && ! flag_ms_extensions)
 	  emit_diagnostic (diag_kind, loc, 0,