70 lines
2.9 KiB
Java
70 lines
2.9 KiB
Java
/*
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* Copyright (c) 2023, 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 compiler.gcbarriers;
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import java.util.Arrays;
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/**
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* @test
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* @bug 8312749
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* @summary Test that, when using a larger object alignment, ZGC arraycopy
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* barriers are only applied to actual OOPs, and not to object
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* alignment padding words.
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* @requires vm.gc.Z
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* @run main/othervm -Xbatch -XX:-TieredCompilation
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* -XX:CompileOnly=compiler.gcbarriers.TestArrayCopyWithLargeObjectAlignment::*
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* -XX:ObjectAlignmentInBytes=16
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* -XX:+UseZGC
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* compiler.gcbarriers.TestArrayCopyWithLargeObjectAlignment
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*/
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public class TestArrayCopyWithLargeObjectAlignment {
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static Object[] doCopyOf(Object[] array) {
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return Arrays.copyOf(array, array.length);
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}
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static Object[] doClone(Object[] array) {
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return array.clone();
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}
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public static void main(String[] args) {
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for (int i = 0; i < 10_000; i++) {
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// This test allocates an array 'a', copies it into a new array 'b'
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// using Arrays.copyOf, and clones 'b' into yet another array. For
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// ObjectAlignmentInBytes=16, the intrinsic implementation of
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// Arrays.copyOf leaves the object alignment padding word "b[1]"
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// untouched, preserving the badHeapWordVal value '0xbaadbabe'. The
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// test checks that this padding word is not processed as a valid
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// OOP by the ZGC arraycopy stub underlying the intrinsic
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// implementation of Object.clone. Allocating b using the intrinsic
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// implementation of Arrays.copyOf is key to reproducing the issue
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// because, unlike regular (fast or slow) array allocation,
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// Arrays.copyOf does not zero-clear the padding word.
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Object[] a = {new Object()};
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Object[] b = doCopyOf(a);
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doClone(b);
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}
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}
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}
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