author | rkennke |
Mon, 10 Dec 2018 15:47:44 +0100 | |
changeset 52925 | 9c18c9d839d3 |
child 54145 | 6f14d52d5e10 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/** |
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* @test TestMaybeNullUnsafeAccess |
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* @summary cast before unsafe access moved in dominating null check null path causes crash |
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* @key gc |
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* @requires vm.gc.Shenandoah |
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* @modules java.base/jdk.internal.misc:+open |
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* |
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* @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation TestMaybeNullUnsafeAccess |
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* |
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*/ |
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import jdk.internal.misc.Unsafe; |
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import java.lang.reflect.Field; |
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public class TestMaybeNullUnsafeAccess { |
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static final jdk.internal.misc.Unsafe UNSAFE = Unsafe.getUnsafe(); |
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static final long F_OFFSET; |
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static class A { |
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int f; |
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} |
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static { |
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try { |
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Field fField = A.class.getDeclaredField("f"); |
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F_OFFSET = UNSAFE.objectFieldOffset(fField); |
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} catch (Exception e) { |
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throw new RuntimeException(e); |
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} |
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} |
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static A test_helper(Object o) { |
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return (A) o; |
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} |
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static int test(Object o) { |
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int f = 0; |
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for (int i = 0; i < 100; i++) { |
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A a = test_helper(o); |
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f = UNSAFE.getInt(a, F_OFFSET); |
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} |
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return f; |
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} |
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static public void main(String[] args) { |
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A a = new A(); |
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for (int i = 0; i < 20000; i++) { |
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test_helper(null); |
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test_helper(a); |
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test(a); |
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} |
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} |
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} |