107 lines
3.6 KiB
Java
107 lines
3.6 KiB
Java
/*
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* Copyright (c) 2017, 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
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* @bug 8179678
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* @summary ArrayCopy with same src and dst can cause incorrect execution or compiler crash
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*
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* @run main/othervm -XX:CompileCommand=compileonly,TestACSameSrcDst::test* TestACSameSrcDst
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*
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*/
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public class TestACSameSrcDst {
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static int test1(int[] src, int[] dst) {
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System.arraycopy(src, 5, dst, 0, 10);
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// this shouldn't be transformed to src[5] because the copy
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// can modify src[5] if src and dst are the same.
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return dst[0];
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}
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static int test2(int[] src) {
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System.arraycopy(src, 0, src, 0, 10);
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// same source and destination. If load from destination is
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// transformed to load of source, the compiler performs that
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// optimization in an infinite loop.
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return src[0];
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}
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static int test3() {
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int[] src = new int[15];
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src[5] = 0x42;
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System.arraycopy(src, 5, src, 0, 10);
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// That load can't bypass the arraycopy
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return src[0];
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}
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static int test4() {
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int[] src = new int[15];
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System.arraycopy(src, 0, src, 5, 10);
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return src[0];
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}
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// The dst[0] load can't bypass the arraycopy. After ArrayCopyNode
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// is expanded, C2 looks for a stub call on the control paths of
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// the array copy subgraph to decide whether the load's memory
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// input can bypass the arraycopy. This test verifies the case of
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// a source array that's not declared as an array.
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static int test5(Object src, int l, boolean flag) {
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int[] dst = new int[10];
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if (flag) {
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dst[0] = 0x42;
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System.arraycopy(src, 0, dst, 0, l);
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return dst[0];
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}
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return 0;
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}
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public static void main(String[] args) {
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int[] array = new int[15];
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for (int i = 0; i < 20000; i++) {
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int res;
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for (int j = 0; j < array.length; j++) {
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array[j] = j;
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}
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int expected = array[5];
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res = test1(array, array);
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if (res != expected) {
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throw new RuntimeException("bad result: " + res + " != " + expected);
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}
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test2(array);
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res = test3();
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if (res != 0x42) {
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throw new RuntimeException("bad result: " + res + " != " + 0x42);
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}
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test4();
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for (int j = 0; j < array.length; j++) {
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array[j] = j;
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}
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res = test5(array, 10, (i%2) == 0);
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if (res != 0) {
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throw new RuntimeException("bad result: " + res + " != " + 0);
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}
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}
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}
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}
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