| /* |
| * Copyright (c) 2016, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 8155781 |
| * @modules java.base/jdk.internal.misc |
| * |
| * @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions |
| * -XX:-TieredCompilation -Xbatch |
| * -XX:+UseCompressedOops -XX:+UseCompressedClassPointers |
| * -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test* |
| * compiler.unsafe.OpaqueAccesses |
| * @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions |
| * -XX:-TieredCompilation -Xbatch |
| * -XX:+UseCompressedOops -XX:-UseCompressedClassPointers |
| * -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test* |
| * compiler.unsafe.OpaqueAccesses |
| * @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions |
| * -XX:-TieredCompilation -Xbatch |
| * -XX:-UseCompressedOops -XX:+UseCompressedClassPointers |
| * -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test* |
| * compiler.unsafe.OpaqueAccesses |
| * @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions |
| * -XX:-TieredCompilation -Xbatch |
| * -XX:-UseCompressedOops -XX:-UseCompressedClassPointers |
| * -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test* |
| * compiler.unsafe.OpaqueAccesses |
| */ |
| package compiler.unsafe; |
| |
| import jdk.internal.misc.Unsafe; |
| |
| import java.lang.reflect.Field; |
| |
| public class OpaqueAccesses { |
| private static final Unsafe UNSAFE = Unsafe.getUnsafe(); |
| |
| private static final Object INSTANCE = new OpaqueAccesses(); |
| |
| private static final Object[] ARRAY = new Object[10]; |
| |
| private static final long F_OFFSET; |
| private static final long E_OFFSET; |
| |
| static { |
| try { |
| Field field = OpaqueAccesses.class.getDeclaredField("f"); |
| F_OFFSET = UNSAFE.objectFieldOffset(field); |
| |
| E_OFFSET = UNSAFE.arrayBaseOffset(ARRAY.getClass()); |
| } catch (NoSuchFieldException e) { |
| throw new Error(e); |
| } |
| } |
| |
| private Object f = new Object(); |
| private long l1, l2; |
| |
| static Object testFixedOffsetField(Object o) { |
| return UNSAFE.getObject(o, F_OFFSET); |
| } |
| |
| static int testFixedOffsetHeader0(Object o) { |
| return UNSAFE.getInt(o, 0); |
| } |
| |
| static int testFixedOffsetHeader4(Object o) { |
| return UNSAFE.getInt(o, 4); |
| } |
| |
| static int testFixedOffsetHeader8(Object o) { |
| return UNSAFE.getInt(o, 8); |
| } |
| |
| static int testFixedOffsetHeader12(Object o) { |
| return UNSAFE.getInt(o, 12); |
| } |
| |
| static int testFixedOffsetHeader16(Object o) { |
| return UNSAFE.getInt(o, 16); |
| } |
| |
| static int testFixedOffsetHeader17(Object o) { |
| return UNSAFE.getIntUnaligned(o, 17); |
| } |
| |
| static Object testFixedBase(long off) { |
| return UNSAFE.getObject(INSTANCE, off); |
| } |
| |
| static Object testOpaque(Object o, long off) { |
| return UNSAFE.getObject(o, off); |
| } |
| |
| static int testFixedOffsetHeaderArray0(Object[] arr) { |
| return UNSAFE.getInt(arr, 0); |
| } |
| |
| static int testFixedOffsetHeaderArray4(Object[] arr) { |
| return UNSAFE.getInt(arr, 4); |
| } |
| |
| static int testFixedOffsetHeaderArray8(Object[] arr) { |
| return UNSAFE.getInt(arr, 8); |
| } |
| |
| static int testFixedOffsetHeaderArray12(Object[] arr) { |
| return UNSAFE.getInt(arr, 12); |
| } |
| |
| static int testFixedOffsetHeaderArray16(Object[] arr) { |
| return UNSAFE.getInt(arr, 16); |
| } |
| |
| static int testFixedOffsetHeaderArray17(Object[] arr) { |
| return UNSAFE.getIntUnaligned(arr, 17); |
| } |
| |
| static Object testFixedOffsetArray(Object[] arr) { |
| return UNSAFE.getObject(arr, E_OFFSET); |
| } |
| |
| static Object testFixedBaseArray(long off) { |
| return UNSAFE.getObject(ARRAY, off); |
| } |
| |
| static Object testOpaqueArray(Object[] o, long off) { |
| return UNSAFE.getObject(o, off); |
| } |
| |
| static final long ADDR = UNSAFE.allocateMemory(10); |
| static boolean flag; |
| |
| static int testMixedAccess() { |
| flag = !flag; |
| Object o = (flag ? INSTANCE : null); |
| long off = (flag ? F_OFFSET : ADDR); |
| return UNSAFE.getInt(o, off); |
| } |
| |
| public static void main(String[] args) { |
| for (int i = 0; i < 20_000; i++) { |
| // Instance |
| testFixedOffsetField(INSTANCE); |
| testFixedOffsetHeader0(INSTANCE); |
| testFixedOffsetHeader4(INSTANCE); |
| testFixedOffsetHeader8(INSTANCE); |
| testFixedOffsetHeader12(INSTANCE); |
| testFixedOffsetHeader16(INSTANCE); |
| testFixedOffsetHeader17(INSTANCE); |
| testFixedBase(F_OFFSET); |
| testOpaque(INSTANCE, F_OFFSET); |
| testMixedAccess(); |
| |
| // Array |
| testFixedOffsetHeaderArray0(ARRAY); |
| testFixedOffsetHeaderArray4(ARRAY); |
| testFixedOffsetHeaderArray8(ARRAY); |
| testFixedOffsetHeaderArray12(ARRAY); |
| testFixedOffsetHeaderArray16(ARRAY); |
| testFixedOffsetHeaderArray17(ARRAY); |
| testFixedOffsetArray(ARRAY); |
| testFixedBaseArray(E_OFFSET); |
| testOpaqueArray(ARRAY, E_OFFSET); |
| } |
| System.out.println("TEST PASSED"); |
| } |
| } |