Mercurial > hg > graal-jvmci-8
view test/compiler/unsafe/TestUnsafeLoadControl.java @ 23236:3070e116da4c jdk8u65-b06
Merge
author | asaha |
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date | Thu, 16 Jul 2015 12:54:07 -0700 |
parents | c1c199dde5c9 |
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/* * Copyright (c) 2015, 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 8077504 * @summary Unsafe load can loose control dependency and cause crash * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestUnsafeLoadControl * */ import java.lang.reflect.Field; import sun.misc.Unsafe; public class TestUnsafeLoadControl { private static final Unsafe UNSAFE; static { try { Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe"); unsafeField.setAccessible(true); UNSAFE = (Unsafe) unsafeField.get(null); } catch(Exception e) { throw new RuntimeException(e); } } static int val; static void test1(int[] a, boolean[] flags, boolean flag, long j) { for (int i = 0; i < 10; i++) { if (flags[i]) { if (flag) { long address = (j << 2) + UNSAFE.ARRAY_INT_BASE_OFFSET; int v = UNSAFE.getInt(a, address); val = v; } } } } static int test2(int[] a, boolean[] flags, boolean flag, long j) { int sum = 0; for (int i = 0; i < 10; i++) { if (flags[i]) { if (flag) { long address = (j << 2) + UNSAFE.ARRAY_INT_BASE_OFFSET; int v = UNSAFE.getInt(a, address); if (v == 0) { sum++; } } } } return sum; } static public void main(String[] args) { boolean[] flags = new boolean[10]; for (int i = 0; i < flags.length; i++) { flags[i] = true; } int[] array = new int[10]; for (int i = 0; i < 20000; i++) { test1(array, flags, true, 0); } for (int i = 0; i < flags.length; i++) { flags[i] = false; } test1(array, flags, true, Long.MAX_VALUE/4); for (int i = 0; i < flags.length; i++) { flags[i] = true; } for (int i = 0; i < 20000; i++) { test2(array, flags, true, 0); } for (int i = 0; i < flags.length; i++) { flags[i] = false; } test2(array, flags, true, Long.MAX_VALUE/4); } }