110 lines
3.3 KiB
Java
110 lines
3.3 KiB
Java
/*
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* Copyright (c) 2019, 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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* @test TestUnsafeOffheapSwap
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* @summary Miscompilation in Unsafe off-heap swap routines
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* @key gc
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* @requires vm.gc.Shenandoah & !vm.graal.enabled
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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
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* -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC
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* TestUnsafeOffheapSwap
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*/
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import java.util.*;
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import jdk.internal.misc.Unsafe;
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public class TestUnsafeOffheapSwap {
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static final int SIZE = 10000;
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static final long SEED = 1;
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static final jdk.internal.misc.Unsafe UNSAFE = Unsafe.getUnsafe();
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static final int SCALE = UNSAFE.ARRAY_INT_INDEX_SCALE;
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static Memory mem;
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static int[] arr;
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public static void main(String[] args) throws Exception {
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// Bug is exposed when memory.addr is not known statically
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mem = new Memory(SIZE*SCALE);
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arr = new int[SIZE];
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for (int i = 0; i < 10; i++) {
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test();
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}
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}
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static void test() {
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Random rnd = new Random(SEED);
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for (int i = 0; i < SIZE; i++) {
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int value = rnd.nextInt();
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mem.setInt(i, value);
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arr[i] = value;
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}
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for (int i = 0; i < SIZE; i++) {
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if (arr[i] != mem.getInt(i)) {
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throw new IllegalStateException("TESTBUG: Values mismatch before swaps");
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}
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}
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for (int i = 1; i < SIZE; i++) {
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mem.swap(i - 1, i);
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int tmp = arr[i - 1];
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arr[i - 1] = arr[i];
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arr[i] = tmp;
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}
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for (int i = 0; i < SIZE; i++) {
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if (arr[i] != mem.getInt(i)) {
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throw new IllegalStateException("Values mismatch after swaps");
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}
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}
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}
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static class Memory {
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private final long addr;
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Memory(int size) {
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addr = UNSAFE.allocateMemory(size);
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}
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public int getInt(int idx) {
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return UNSAFE.getInt(addr + idx*SCALE);
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}
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public void setInt(int idx, int val) {
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UNSAFE.putInt(addr + idx*SCALE, val);
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}
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public void swap(int a, int b) {
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int tmp = getInt(a);
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setInt(a, getInt(b));
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setInt(b, tmp);
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}
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}
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}
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