re PR c++/48296 ([C++0x] constexpr member function cannot use the class type it…

re PR c++/48296 ([C++0x] constexpr member function cannot use the class type it belongs as parameter type or return type)

	PR c++/48296
	* decl.c (cp_finish_decl): Defer validation of constexpr member
	functions.
	* class.c (finalize_literal_type_property): Validate them here.
	* semantics.c (is_valid_constexpr_fn): Don't check completeness.

From-SVN: r171661

gcc/cp/ChangeLog

 2011-03-29  Jason Merrill  <jason@redhat.com>
 
+	PR c++/48296
+	* decl.c (cp_finish_decl): Defer validation of constexpr member
+	functions.
+	* class.c (finalize_literal_type_property): Validate them here.
+	* semantics.c (is_valid_constexpr_fn): Don't check completeness.
+
 	* semantics.c (is_valid_constexpr_fn): Specify input location.
 
 2011-03-28  Jason Merrill  <jason@redhat.com>

gcc/cp/class.c

@@ -4549,6 +4549,8 @@ type_requires_array_cookie (tree type)
 static void
 finalize_literal_type_property (tree t)
 {
+  tree fn;
+
   if (cxx_dialect < cxx0x
       || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
       /* FIXME These constraints seem unnecessary; remove from standard.
@@ -4559,18 +4561,10 @@ finalize_literal_type_property (tree t)
 	   && !TYPE_HAS_CONSTEXPR_CTOR (t))
     CLASSTYPE_LITERAL_P (t) = false;
 
-  if (!CLASSTYPE_LITERAL_P (t) && !CLASSTYPE_TEMPLATE_INSTANTIATION (t))
-    {
-      tree fn;
-      for (fn = TYPE_METHODS (t); fn; fn = DECL_CHAIN (fn))
-	if (DECL_DECLARED_CONSTEXPR_P (fn)
-	    && DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)
-	    && !DECL_CONSTRUCTOR_P (fn))
-	  {
-	    error ("enclosing class of %q+D is not a literal type", fn);
-	    DECL_DECLARED_CONSTEXPR_P (fn) = false;
-	  }
-    }
+  for (fn = TYPE_METHODS (t); fn; fn = DECL_CHAIN (fn))
+    if (DECL_DECLARED_CONSTEXPR_P (fn)
+	&& TREE_CODE (fn) != TEMPLATE_DECL)
+      validate_constexpr_fundecl (fn);
 }
 
 /* Check the validity of the bases and members declared in T.  Add any

gcc/cp/decl.c

@@ -5794,7 +5794,10 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
 	}
     }
 
-  if (TREE_CODE (decl) == FUNCTION_DECL)
+  if (TREE_CODE (decl) == FUNCTION_DECL
+      /* For members, defer until finalize_literal_type_property.  */
+      && (!DECL_CLASS_SCOPE_P (decl)
+	  || !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))))
     validate_constexpr_fundecl (decl);
 
   else if (!ensure_literal_type_for_constexpr_object (decl))

gcc/cp/semantics.c

@@ -5354,8 +5354,7 @@ is_valid_constexpr_fn (tree fun, bool complain)
 	}
 
       if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fun)
-	  && COMPLETE_TYPE_P (DECL_CONTEXT (fun))
-	  && !valid_type_in_constexpr_fundecl_p (DECL_CONTEXT (fun)))
+	  && !CLASSTYPE_LITERAL_P (DECL_CONTEXT (fun)))
 	{
 	  ret = false;
 	  if (complain)

gcc/testsuite/ChangeLog

 2011-03-29  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/constexpr-memfn1.C: New.
+
 	* g++.dg/cpp0x/constexpr-diag1.C: Adjust error locations.
 
 2011-03-29  Janus Weil  <janus@gcc.gnu.org>

gcc/testsuite/g++.dg/cpp0x/constexpr-memfn1.C

+// PR c++/48296
+// { dg-options -std=c++0x }
+
+struct X
+{
+  constexpr X() { }
+  constexpr X f(X x) { return x; }
+  constexpr X g(X x);
+};
+
+constexpr X X::g(X x) { return x; }
+
+struct Y
+{
+  Y() { }
+  constexpr Y f(Y y);		// { dg-error "constexpr" }
+  static constexpr Y g(Y y);	// { dg-error "constexpr" }
+};