/* * Copyright (c) 2017, 2020, 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. */ package gc.g1; /* * @test TestInvalidateArrayCopy * @bug 8182050 * @summary Check that benign (0-sized) out of heap bounds card table invalidations do not assert. * @requires vm.gc.G1 * @requires vm.debug * @run main/othervm -XX:NewSize=1M -Xlog:gc -XX:MaxNewSize=1m -XX:-UseTLAB -XX:MaxHeapSize=64M gc.g1.TestInvalidateArrayCopy */ // The test allocates zero-sized arrays of j.l.O and tries to arraycopy random data into it so // that the asserting post barrier calls are executed. It assumes that G1 allocates eden regions // at the top of the heap for this problem to occur. public class TestInvalidateArrayCopy { static final int NumIterations = 1000000; // "Random" source data to "copy" into the target. static Object[] sourceArray = new Object[10]; public static void main(String[] args) { for (int i = 0; i < NumIterations; i++) { Object[] x = new Object[0]; // Make sure that the compiler can't optimize out the above allocations. if (i % (NumIterations / 10) == 0) { System.out.println(x); } System.arraycopy(sourceArray, 0, x, 0, Math.min(x.length, sourceArray.length)); } } }