Wed, 27 Aug 2014 08:19:12 -0400
8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill
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 |