7200776: Implement default methods in interfaces

Add generic type analysis and default method selection algorithms

Reviewed-by: coleenp, acorn

hotspot/src/share/vm/classfile/defaultMethods.hpp

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_CLASSFILE_DEFAULTMETHODS_HPP
+#define SHARE_VM_CLASSFILE_DEFAULTMETHODS_HPP
+
+#include "runtime/handles.hpp"
+#include "utilities/growableArray.hpp"
+#include "utilities/exceptions.hpp"
+
+class InstanceKlass;
+class Symbol;
+class Method;
+
+class DefaultMethods : AllStatic {
+ public:
+
+  // Analyzes class and determines which default methods are inherited
+  // from interfaces (and has no other implementation).  For each method
+  // (and each different signature the method could have), create an
+  // "overpass" method that is an instance method that redirects to the
+  // default method.  Overpass methods are added to the methods lists for
+  // the class.
+  static void generate_default_methods(
+      InstanceKlass* klass, GrowableArray<Method*>* mirandas, TRAPS);
+
+
+  // Called during linking when an invokespecial to an direct interface
+  // method is found.  Selects and returns a method if there is a unique
+  // default method in the 'super_iface' part of the hierarchy which is
+  // also a candidate default for 'this_klass'.  Otherwise throws an AME.
+  static Method* find_super_default(
+      Klass* this_klass, Klass* super_iface,
+      Symbol* method_name, Symbol* method_sig, TRAPS);
+};
+
+#endif // SHARE_VM_CLASSFILE_DEFAULTMETHODS_HPP