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test/compiler/7190310/Test7190310_unsafe.java@5201379fe487 (annotated)

test/compiler/7190310/Test7190310_unsafe.java

Thu, 11 Apr 2013 21:45:21 -0700

author

amurillo

date

Thu, 11 Apr 2013 21:45:21 -0700

changeset 4915

5201379fe487

parent 0

f90c822e73f8

permissions

-rw-r--r--

Added tag hs25-b28 for changeset 6d88a566d369

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	/*
aoqi@0	26	* @test
aoqi@0	27	* @bug 7190310
aoqi@0	28	* @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
aoqi@0	29	* @run main/othervm -Xbatch Test7190310_unsafe
aoqi@0	30	*/
aoqi@0	31
aoqi@0	32	import java.lang.ref.*;
aoqi@0	33	import java.lang.reflect.*;
aoqi@0	34	import sun.misc.Unsafe;
aoqi@0	35
aoqi@0	36	public class Test7190310_unsafe {
aoqi@0	37
aoqi@0	38	static class TestObject {
aoqi@0	39	public String toString() {
aoqi@0	40	return "TestObject";
aoqi@0	41	}
aoqi@0	42	};
aoqi@0	43
aoqi@0	44	private static TestObject str = new TestObject();
aoqi@0	45	private static final WeakReference ref = new WeakReference(str);
aoqi@0	46
aoqi@0	47	private TestObject obj;
aoqi@0	48
aoqi@0	49	public static void main(String[] args) throws Exception {
aoqi@0	50	Class c = Test7190310_unsafe.class.getClassLoader().loadClass("sun.misc.Unsafe");
aoqi@0	51	Field f = c.getDeclaredField("theUnsafe");
aoqi@0	52	f.setAccessible(true);
aoqi@0	53	Unsafe unsafe = (Unsafe)f.get(c);
aoqi@0	54
aoqi@0	55	f = Reference.class.getDeclaredField("referent");
aoqi@0	56	f.setAccessible(true);
aoqi@0	57	long referent_offset = unsafe.objectFieldOffset(f);
aoqi@0	58
aoqi@0	59	Test7190310_unsafe t = new Test7190310_unsafe();
aoqi@0	60	TestObject o = new TestObject();
aoqi@0	61	t.obj = o;
aoqi@0	62
aoqi@0	63	// Warmup (compile methods)
aoqi@0	64	System.err.println("Warmup");
aoqi@0	65	Object obj = null;
aoqi@0	66	for (int i = 0; i < 11000; i++) {
aoqi@0	67	obj = getRef0(ref);
aoqi@0	68	}
aoqi@0	69	for (int i = 0; i < 11000; i++) {
aoqi@0	70	obj = getRef1(unsafe, ref, referent_offset);
aoqi@0	71	}
aoqi@0	72	for (int i = 0; i < 11000; i++) {
aoqi@0	73	obj = getRef2(unsafe, ref, referent_offset);
aoqi@0	74	}
aoqi@0	75	for (int i = 0; i < 11000; i++) {
aoqi@0	76	obj = getRef3(unsafe, ref, referent_offset);
aoqi@0	77	}
aoqi@0	78	for (int i = 0; i < 11000; i++) {
aoqi@0	79	obj = getRef4(unsafe, t, referent_offset);
aoqi@0	80	}
aoqi@0	81
aoqi@0	82	// Access verification
aoqi@0	83	System.err.println("Verification");
aoqi@0	84	if (!verifyGet(referent_offset, unsafe)) {
aoqi@0	85	System.exit(97);
aoqi@0	86	}
aoqi@0	87
aoqi@0	88	obj = getRef3(unsafe, t, referent_offset);
aoqi@0	89	if (obj != o) {
aoqi@0	90	System.out.println("FAILED: unsafe.getObject(Object, " + referent_offset + ") " + obj + " != " + o);
aoqi@0	91	System.exit(97);
aoqi@0	92	}
aoqi@0	93	obj = getRef4(unsafe, t, referent_offset);
aoqi@0	94	if (obj != o) {
aoqi@0	95	System.out.println("FAILED: unsafe.getObject(Test7190310, " + referent_offset + ") " + obj + " != " + o);
aoqi@0	96	System.exit(97);
aoqi@0	97	}
aoqi@0	98	}
aoqi@0	99
aoqi@0	100	static boolean verifyGet(long referent_offset, Unsafe unsafe) throws Exception {
aoqi@0	101	// Access verification
aoqi@0	102	System.out.println("referent: " + str);
aoqi@0	103	Object obj = getRef0(ref);
aoqi@0	104	if (obj != str) {
aoqi@0	105	System.out.println("FAILED: weakRef.get() " + obj + " != " + str);
aoqi@0	106	return false;
aoqi@0	107	}
aoqi@0	108	obj = getRef1(unsafe, ref, referent_offset);
aoqi@0	109	if (obj != str) {
aoqi@0	110	System.out.println("FAILED: unsafe.getObject(weakRef, " + referent_offset + ") " + obj + " != " + str);
aoqi@0	111	return false;
aoqi@0	112	}
aoqi@0	113	obj = getRef2(unsafe, ref, referent_offset);
aoqi@0	114	if (obj != str) {
aoqi@0	115	System.out.println("FAILED: unsafe.getObject(abstRef, " + referent_offset + ") " + obj + " != " + str);
aoqi@0	116	return false;
aoqi@0	117	}
aoqi@0	118	obj = getRef3(unsafe, ref, referent_offset);
aoqi@0	119	if (obj != str) {
aoqi@0	120	System.out.println("FAILED: unsafe.getObject(Object, " + referent_offset + ") " + obj + " != " + str);
aoqi@0	121	return false;
aoqi@0	122	}
aoqi@0	123	return true;
aoqi@0	124	}
aoqi@0	125
aoqi@0	126	static Object getRef0(WeakReference ref) throws Exception {
aoqi@0	127	return ref.get();
aoqi@0	128	}
aoqi@0	129	static Object getRef1(Unsafe unsafe, WeakReference ref, long referent_offset) throws Exception {
aoqi@0	130	return unsafe.getObject(ref, referent_offset);
aoqi@0	131	}
aoqi@0	132	static Object getRef2(Unsafe unsafe, Reference ref, long referent_offset) throws Exception {
aoqi@0	133	return unsafe.getObject(ref, referent_offset);
aoqi@0	134	}
aoqi@0	135	static Object getRef3(Unsafe unsafe, Object ref, long referent_offset) throws Exception {
aoqi@0	136	return unsafe.getObject(ref, referent_offset);
aoqi@0	137	}
aoqi@0	138	static Object getRef4(Unsafe unsafe, Test7190310_unsafe ref, long referent_offset) throws Exception {
aoqi@0	139	return unsafe.getObject(ref, referent_offset);
aoqi@0	140	}
aoqi@0	141	}
aoqi@0	142