# HG changeset patch
# User vlivanov
# Date 1389804524 -14400
# Node ID 9e91793fd5166fef5d47b57619591102e2ab1439
# Parent  a110ff64efa081d2408ff99d9656cdee72bf6f4c
8031502: JSR292: IncompatibleClassChangeError in LambdaForm for CharSequence.toString() method handle type converter
Reviewed-by: sundar, lagergren, drchase

diff -r a110ff64efa0 -r 9e91793fd516 src/share/classes/java/lang/invoke/InvokerBytecodeGenerator.java
--- a/src/share/classes/java/lang/invoke/InvokerBytecodeGenerator.java	Tue Jan 14 23:10:36 2014 +0400
+++ b/src/share/classes/java/lang/invoke/InvokerBytecodeGenerator.java	Wed Jan 15 20:48:44 2014 +0400
@@ -638,6 +638,12 @@
             refKind = REF_invokeVirtual;
         }
 
+        if (member.getDeclaringClass().isInterface() && refKind == REF_invokeVirtual) {
+            // Methods from Object declared in an interface can be resolved by JVM to invokevirtual kind.
+            // Need to convert it back to invokeinterface to pass verification and make the invocation works as expected.
+            refKind = REF_invokeInterface;
+        }
+
         // push arguments
         for (int i = 0; i < name.arguments.length; i++) {
             emitPushArgument(name, i);
diff -r a110ff64efa0 -r 9e91793fd516 test/java/lang/invoke/ObjectMethodInInterfaceTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/java/lang/invoke/ObjectMethodInInterfaceTest.java	Wed Jan 15 20:48:44 2014 +0400
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2014, 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.
+ */
+
+/* @test
+ * @bug 8031502
+ * @summary JSR292: IncompatibleClassChangeError in LambdaForm for CharSequence.toString() method handle type converter
+ * @compile ObjectMethodInInterfaceTest.java
+ * @run main/othervm -Djava.lang.invoke.MethodHandle.COMPILE_THRESHOLD=0 test.java.lang.invoke.ObjectMethodInInterfaceTest
+ */
+package test.java.lang.invoke;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+
+public class ObjectMethodInInterfaceTest {
+    public static void main(String[] args) throws Throwable {
+        MethodHandle mh = MethodHandles.lookup().findVirtual(CharSequence.class, "toString", MethodType.methodType(String.class));
+        MethodType mt = MethodType.methodType(Object.class, CharSequence.class);
+        mh = mh.asType(mt);
+
+        Object res = mh.invokeExact((CharSequence)"123");
+
+        System.out.println("TEST PASSED");
+    }
+}