pt.c (num_template_headers_for_class): Rework per the code inline in…

pt.c (num_template_headers_for_class): Rework per the code inline in cp_parser_check_declarator_template_parameters.

2012-09-07  Paolo Carlini  <paolo.carlini@oracle.com>

	* pt.c (num_template_headers_for_class): Rework per the code
	inline in cp_parser_check_declarator_template_parameters.
	* parser.c (cp_parser_check_declarator_template_parameters):
	Use num_template_headers_for_class.

From-SVN: r191082

gcc/cp/ChangeLog

+2012-09-07  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* pt.c (num_template_headers_for_class): Rework per the code
+	inline in cp_parser_check_declarator_template_parameters.
+	* parser.c (cp_parser_check_declarator_template_parameters):
+	Use num_template_headers_for_class.
+
 2012-09-06  Jason Merrill  <jason@redhat.com>
 
 	PR c++/54341

gcc/cp/parser.c

@@ -20670,54 +20670,24 @@ cp_parser_check_declarator_template_parameters (cp_parser* parser,
 						cp_declarator *declarator,
 						location_t declarator_location)
 {
-  unsigned num_templates;
-
-  /* We haven't seen any classes that involve template parameters yet.  */
-  num_templates = 0;
-
   switch (declarator->kind)
     {
     case cdk_id:
-      if (declarator->u.id.qualifying_scope)
-	{
-	  tree scope;
-
-	  scope = declarator->u.id.qualifying_scope;
-
-	  while (scope && CLASS_TYPE_P (scope))
-	    {
-	      /* You're supposed to have one `template <...>'
-		 for every template class, but you don't need one
-		 for a full specialization.  For example:
-
-		 template <class T> struct S{};
-		 template <> struct S<int> { void f(); };
-		 void S<int>::f () {}
-
-		 is correct; there shouldn't be a `template <>' for
-		 the definition of `S<int>::f'.  */
-	      if (!CLASSTYPE_TEMPLATE_INFO (scope))
-		/* If SCOPE does not have template information of any
-		   kind, then it is not a template, nor is it nested
-		   within a template.  */
-		break;
-	      if (explicit_class_specialization_p (scope))
-		break;
-	      if (PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (scope)))
-		++num_templates;
-
-	      scope = TYPE_CONTEXT (scope);
-	    }
-	}
-      else if (TREE_CODE (declarator->u.id.unqualified_name)
-	       == TEMPLATE_ID_EXPR)
-	/* If the DECLARATOR has the form `X<y>' then it uses one
-	   additional level of template parameters.  */
-	++num_templates;
+      {
+	unsigned num_templates = 0;
+	tree scope = declarator->u.id.qualifying_scope;
 
-      return cp_parser_check_template_parameters 
-	(parser, num_templates, declarator_location, declarator);
+	if (scope)
+	  num_templates = num_template_headers_for_class (scope);
+	else if (TREE_CODE (declarator->u.id.unqualified_name)
+		 == TEMPLATE_ID_EXPR)
+	  /* If the DECLARATOR has the form `X<y>' then it uses one
+	     additional level of template parameters.  */
+	  ++num_templates;
 
+	return cp_parser_check_template_parameters 
+	  (parser, num_templates, declarator_location, declarator);
+      }
 
     case cdk_function:
     case cdk_array:

gcc/cp/pt.c

@@ -2214,9 +2214,9 @@ copy_default_args_to_explicit_spec (tree decl)
 int
 num_template_headers_for_class (tree ctype)
 {
-  int template_count = 0;
-  tree t = ctype;
-  while (t != NULL_TREE && CLASS_TYPE_P (t))
+  int num_templates = 0;
+
+  while (ctype && CLASS_TYPE_P (ctype))
     {
       /* You're supposed to have one `template <...>' for every
 	 template class, but you don't need one for a full
@@ -2228,21 +2228,20 @@ num_template_headers_for_class (tree ctype)
 
 	 is correct; there shouldn't be a `template <>' for the
 	 definition of `S<int>::f'.  */
-      if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
-	  && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
-	/* T is an explicit (not partial) specialization.  All
-	   containing classes must therefore also be explicitly
-	   specialized.  */
+      if (!CLASSTYPE_TEMPLATE_INFO (ctype))
+	/* If CTYPE does not have template information of any
+	   kind,  then it is not a template, nor is it nested
+	   within a template.  */
+	break;
+      if (explicit_class_specialization_p (ctype))
 	break;
-      if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
-	  && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
-	template_count += 1;
+      if (PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (ctype)))
+	++num_templates;
 
-      t = TYPE_MAIN_DECL (t);
-      t = DECL_CONTEXT (t);
+      ctype = TYPE_CONTEXT (ctype);
     }
 
-  return template_count;
+  return num_templates;
 }
 
 /* Do a simple sanity check on the template headers that precede the