author | mchung |
Mon, 22 Oct 2018 17:00:04 -0700 | |
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parent 51016 | a926b7737d3b |
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/* |
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. 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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* @test |
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* @bug 8155781 |
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* @modules java.base/jdk.internal.misc |
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* |
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* @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions |
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* -XX:-TieredCompilation -Xbatch |
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* -XX:+UseCompressedOops -XX:+UseCompressedClassPointers |
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* -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test* |
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* compiler.unsafe.OpaqueAccesses |
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* @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions |
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* -XX:-TieredCompilation -Xbatch |
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* -XX:+UseCompressedOops -XX:-UseCompressedClassPointers |
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* -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test* |
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* compiler.unsafe.OpaqueAccesses |
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* @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions |
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* -XX:-TieredCompilation -Xbatch |
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* -XX:-UseCompressedOops -XX:+UseCompressedClassPointers |
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* -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test* |
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* compiler.unsafe.OpaqueAccesses |
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* @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions |
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* -XX:-TieredCompilation -Xbatch |
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* -XX:-UseCompressedOops -XX:-UseCompressedClassPointers |
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* -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test* |
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* compiler.unsafe.OpaqueAccesses |
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*/ |
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package compiler.unsafe; |
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import jdk.internal.misc.Unsafe; |
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import java.lang.reflect.Field; |
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public class OpaqueAccesses { |
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private static final Unsafe UNSAFE = Unsafe.getUnsafe(); |
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private static final Object INSTANCE = new OpaqueAccesses(); |
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private static final Object[] ARRAY = new Object[10]; |
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private static final long F_OFFSET; |
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private static final long E_OFFSET; |
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static { |
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try { |
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Field field = OpaqueAccesses.class.getDeclaredField("f"); |
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F_OFFSET = UNSAFE.objectFieldOffset(field); |
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E_OFFSET = UNSAFE.arrayBaseOffset(ARRAY.getClass()); |
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} catch (NoSuchFieldException e) { |
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throw new Error(e); |
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} |
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} |
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private Object f = new Object(); |
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private long l1, l2; |
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static Object testFixedOffsetField(Object o) { |
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return UNSAFE.getReference(o, F_OFFSET); |
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} |
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static int testFixedOffsetHeader0(Object o) { |
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return UNSAFE.getInt(o, 0); |
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} |
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static int testFixedOffsetHeader4(Object o) { |
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return UNSAFE.getInt(o, 4); |
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} |
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static int testFixedOffsetHeader8(Object o) { |
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return UNSAFE.getInt(o, 8); |
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} |
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static int testFixedOffsetHeader12(Object o) { |
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return UNSAFE.getInt(o, 12); |
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} |
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static int testFixedOffsetHeader16(Object o) { |
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return UNSAFE.getInt(o, 16); |
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} |
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static int testFixedOffsetHeader17(Object o) { |
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return UNSAFE.getIntUnaligned(o, 17); |
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} |
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static Object testFixedBase(long off) { |
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return UNSAFE.getReference(INSTANCE, off); |
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} |
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static Object testOpaque(Object o, long off) { |
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return UNSAFE.getReference(o, off); |
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} |
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static int testFixedOffsetHeaderArray0(Object[] arr) { |
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return UNSAFE.getInt(arr, 0); |
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} |
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static int testFixedOffsetHeaderArray4(Object[] arr) { |
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return UNSAFE.getInt(arr, 4); |
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} |
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static int testFixedOffsetHeaderArray8(Object[] arr) { |
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return UNSAFE.getInt(arr, 8); |
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} |
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static int testFixedOffsetHeaderArray12(Object[] arr) { |
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return UNSAFE.getInt(arr, 12); |
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} |
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static int testFixedOffsetHeaderArray16(Object[] arr) { |
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return UNSAFE.getInt(arr, 16); |
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} |
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static int testFixedOffsetHeaderArray17(Object[] arr) { |
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return UNSAFE.getIntUnaligned(arr, 17); |
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} |
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static Object testFixedOffsetArray(Object[] arr) { |
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return UNSAFE.getReference(arr, E_OFFSET); |
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} |
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static Object testFixedBaseArray(long off) { |
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return UNSAFE.getReference(ARRAY, off); |
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} |
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static Object testOpaqueArray(Object[] o, long off) { |
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return UNSAFE.getReference(o, off); |
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} |
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static final long ADDR = UNSAFE.allocateMemory(10); |
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static boolean flag; |
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static int testMixedAccess() { |
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flag = !flag; |
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Object o = (flag ? INSTANCE : null); |
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long off = (flag ? F_OFFSET : ADDR); |
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return UNSAFE.getInt(o, off); |
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} |
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public static void main(String[] args) { |
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for (int i = 0; i < 20_000; i++) { |
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// Instance |
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testFixedOffsetField(INSTANCE); |
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testFixedOffsetHeader0(INSTANCE); |
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testFixedOffsetHeader4(INSTANCE); |
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testFixedOffsetHeader8(INSTANCE); |
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testFixedOffsetHeader12(INSTANCE); |
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testFixedOffsetHeader16(INSTANCE); |
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testFixedOffsetHeader17(INSTANCE); |
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testFixedBase(F_OFFSET); |
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testOpaque(INSTANCE, F_OFFSET); |
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testMixedAccess(); |
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// Array |
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testFixedOffsetHeaderArray0(ARRAY); |
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testFixedOffsetHeaderArray4(ARRAY); |
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testFixedOffsetHeaderArray8(ARRAY); |
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testFixedOffsetHeaderArray12(ARRAY); |
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testFixedOffsetHeaderArray16(ARRAY); |
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testFixedOffsetHeaderArray17(ARRAY); |
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testFixedOffsetArray(ARRAY); |
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testFixedBaseArray(E_OFFSET); |
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testOpaqueArray(ARRAY, E_OFFSET); |
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} |
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System.out.println("TEST PASSED"); |
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} |
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} |