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