| /* |
| * 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. |
| * |
| */ |
| |
| /* |
| * @test |
| * @bug 7190310 |
| * @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops |
| * @run main/othervm -Xbatch Test7190310_unsafe |
| */ |
| |
| import java.lang.ref.*; |
| import java.lang.reflect.*; |
| import sun.misc.Unsafe; |
| |
| public class Test7190310_unsafe { |
| |
| static class TestObject { |
| public String toString() { |
| return "TestObject"; |
| } |
| }; |
| |
| private static TestObject str = new TestObject(); |
| private static final WeakReference ref = new WeakReference(str); |
| |
| private TestObject obj; |
| |
| public static void main(String[] args) throws Exception { |
| Class c = Test7190310_unsafe.class.getClassLoader().loadClass("sun.misc.Unsafe"); |
| Field f = c.getDeclaredField("theUnsafe"); |
| f.setAccessible(true); |
| Unsafe unsafe = (Unsafe)f.get(c); |
| |
| f = Reference.class.getDeclaredField("referent"); |
| f.setAccessible(true); |
| long referent_offset = unsafe.objectFieldOffset(f); |
| |
| Test7190310_unsafe t = new Test7190310_unsafe(); |
| TestObject o = new TestObject(); |
| t.obj = o; |
| |
| // Warmup (compile methods) |
| System.err.println("Warmup"); |
| Object obj = null; |
| for (int i = 0; i < 11000; i++) { |
| obj = getRef0(ref); |
| } |
| for (int i = 0; i < 11000; i++) { |
| obj = getRef1(unsafe, ref, referent_offset); |
| } |
| for (int i = 0; i < 11000; i++) { |
| obj = getRef2(unsafe, ref, referent_offset); |
| } |
| for (int i = 0; i < 11000; i++) { |
| obj = getRef3(unsafe, ref, referent_offset); |
| } |
| for (int i = 0; i < 11000; i++) { |
| obj = getRef4(unsafe, t, referent_offset); |
| } |
| |
| // Access verification |
| System.err.println("Verification"); |
| if (!verifyGet(referent_offset, unsafe)) { |
| System.exit(97); |
| } |
| |
| obj = getRef3(unsafe, t, referent_offset); |
| if (obj != o) { |
| System.out.println("FAILED: unsafe.getObject(Object, " + referent_offset + ") " + obj + " != " + o); |
| System.exit(97); |
| } |
| obj = getRef4(unsafe, t, referent_offset); |
| if (obj != o) { |
| System.out.println("FAILED: unsafe.getObject(Test7190310, " + referent_offset + ") " + obj + " != " + o); |
| System.exit(97); |
| } |
| } |
| |
| static boolean verifyGet(long referent_offset, Unsafe unsafe) throws Exception { |
| // Access verification |
| System.out.println("referent: " + str); |
| Object obj = getRef0(ref); |
| if (obj != str) { |
| System.out.println("FAILED: weakRef.get() " + obj + " != " + str); |
| return false; |
| } |
| obj = getRef1(unsafe, ref, referent_offset); |
| if (obj != str) { |
| System.out.println("FAILED: unsafe.getObject(weakRef, " + referent_offset + ") " + obj + " != " + str); |
| return false; |
| } |
| obj = getRef2(unsafe, ref, referent_offset); |
| if (obj != str) { |
| System.out.println("FAILED: unsafe.getObject(abstRef, " + referent_offset + ") " + obj + " != " + str); |
| return false; |
| } |
| obj = getRef3(unsafe, ref, referent_offset); |
| if (obj != str) { |
| System.out.println("FAILED: unsafe.getObject(Object, " + referent_offset + ") " + obj + " != " + str); |
| return false; |
| } |
| return true; |
| } |
| |
| static Object getRef0(WeakReference ref) throws Exception { |
| return ref.get(); |
| } |
| static Object getRef1(Unsafe unsafe, WeakReference ref, long referent_offset) throws Exception { |
| return unsafe.getObject(ref, referent_offset); |
| } |
| static Object getRef2(Unsafe unsafe, Reference ref, long referent_offset) throws Exception { |
| return unsafe.getObject(ref, referent_offset); |
| } |
| static Object getRef3(Unsafe unsafe, Object ref, long referent_offset) throws Exception { |
| return unsafe.getObject(ref, referent_offset); |
| } |
| static Object getRef4(Unsafe unsafe, Test7190310_unsafe ref, long referent_offset) throws Exception { |
| return unsafe.getObject(ref, referent_offset); |
| } |
| } |
| |