diff test/runtime/8003720/VictimClassLoader.java @ 7179:d0aa87f04bd5

8003720: NPG: Method in interpreter stack frame can be deallocated Summary: Pass down a closure during root scanning to keep the class of the method alive. Reviewed-by: coleenp, jcoomes
author stefank
date Tue, 27 Nov 2012 10:13:20 +0100
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/runtime/8003720/VictimClassLoader.java	Tue Nov 27 10:13:20 2012 +0100
@@ -0,0 +1,86 @@
+/*
+ * 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.
+ *
+ */
+
+public class VictimClassLoader extends ClassLoader {
+    public static long counter = 0;
+
+    private int which = (int) ++counter;
+
+    protected VictimClassLoader() {
+        super(VictimClassLoader.class.getClassLoader());
+    }
+
+    protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
+        Class c;
+        if (!name.endsWith("Victim")) {
+            c = super.loadClass(name, resolve);
+            return c;
+        }
+
+        c = findLoadedClass(name);
+        if (c != null) {
+            return c;
+        }
+
+        byte[] buf = readClassFile(name);
+        c = defineClass(name, buf, 0, buf.length);
+        resolveClass(c);
+
+        if (c.getClassLoader() != this) {
+            throw new AssertionError();
+        }
+
+        Test8003720.println("loaded " + c + "#" + System.identityHashCode(c) + " in " + c.getClassLoader());
+        return c;
+    }
+
+    static byte[] readClassFile(String name) {
+        try {
+            String rname = name.substring(name.lastIndexOf('.') + 1) + ".class";
+            java.net.URL url = VictimClassLoader.class.getResource(rname);
+            Test8003720.println("found " + rname + " = " + url);
+
+            java.net.URLConnection connection = url.openConnection();
+            int contentLength = connection.getContentLength();
+            byte[] buf = readFully(connection.getInputStream(), contentLength);
+
+            return Asmator.fixup(buf);
+        } catch (java.io.IOException ex) {
+            throw new Error(ex);
+        }
+    }
+
+    static byte[] readFully(java.io.InputStream in, int len) throws java.io.IOException {
+        // Warning here:
+        return sun.misc.IOUtils.readFully(in, len, true);
+    }
+
+    public void finalize() {
+        Test8003720.println("Goodbye from " + this);
+    }
+
+    public String toString() {
+        return "VictimClassLoader#" + which;
+    }
+}