--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/profiling/spectrapredefineclass/Agent.java	Tue Apr 08 09:51:25 2014 +0200
@@ -0,0 +1,142 @@
+/*
+ * 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.
+ */
+
+import java.security.*;
+import java.lang.instrument.*;
+import java.lang.reflect.*;
+import java.lang.management.ManagementFactory;
+import com.sun.tools.attach.VirtualMachine;
+
+class A {
+    void m() {
+    }
+}
+
+class B extends A {
+    void m() {
+    }
+}
+
+class C extends A {
+    void m() {
+    }
+}
+
+class Test {
+
+    static public void m() throws Exception {
+        for (int i = 0; i < 20000; i++) {
+            m1(a);
+        }
+        for (int i = 0; i < 4; i++) {
+            m1(b);
+        }
+    }
+
+    static boolean m1(A a) {
+        boolean res =  Agent.m2(a);
+        return res;
+    }
+
+    static public A a = new A();
+    static public B b = new B();
+    static public C c = new C();
+}
+
+public class Agent implements ClassFileTransformer {
+
+
+    static class MemoryChunk {
+        MemoryChunk other;
+        long[] array;
+        MemoryChunk(MemoryChunk other) {
+            other = other;
+            array = new long[1024 * 1024 * 1024];
+        }
+    }
+
+    static public boolean m2(A a) {
+        boolean res = false;
+        if (a.getClass() == B.class) {
+            a.m();
+        } else {
+            res = true;
+        }
+        return res;
+    }
+
+    static public void main(String[] args) throws Exception {
+        // Create speculative trap entries
+        Test.m();
+
+        String nameOfRunningVM = ManagementFactory.getRuntimeMXBean().getName();
+        int p = nameOfRunningVM.indexOf('@');
+        String pid = nameOfRunningVM.substring(0, p);
+
+        // Make the nmethod go away
+        for (int i = 0; i < 10; i++) {
+            System.gc();
+        }
+
+        // Redefine class
+        try {
+            VirtualMachine vm = VirtualMachine.attach(pid);
+            vm.loadAgent(System.getProperty("test.classes",".") + "/agent.jar", "");
+            vm.detach();
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+
+        Test.m();
+        // GC will hit dead method pointer
+        for (int i = 0; i < 10; i++) {
+            System.gc();
+        }
+    }
+
+    public synchronized byte[] transform(final ClassLoader classLoader,
+                                         final String className,
+                                         Class<?> classBeingRedefined,
+                                         ProtectionDomain protectionDomain,
+                                         byte[] classfileBuffer) {
+        System.out.println("Transforming class " + className);
+        return classfileBuffer;
+    }
+
+    public static void redefine(String agentArgs, Instrumentation instrumentation, Class to_redefine) {
+
+        try {
+            instrumentation.retransformClasses(to_redefine);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    public static void agentmain(String agentArgs, Instrumentation instrumentation) throws Exception {
+        Agent transformer = new Agent();
+        instrumentation.addTransformer(transformer, true);
+
+        redefine(agentArgs, instrumentation, Test.class);
+    }
+}