91 lines
3.4 KiB
Java
91 lines
3.4 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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/* @test
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* @summary Test that pinned objects we lost all Java references to keep
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* the region and contents alive.
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* This test simulates this behavior using Whitebox/Unsafe methods
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* and not real native code for simplicity.
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* @requires vm.gc.G1
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* @requires vm.debug
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* @library /test/lib
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* @modules java.base/jdk.internal.misc:+open
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* java.management
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. -XX:+ZapUnusedHeapArea -Xlog:gc,gc+ergo+cset=trace gc.g1.pinnedobjs.TestPinnedObjectContents
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*/
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package gc.g1.pinnedobjs;
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import jdk.internal.misc.Unsafe;
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import jdk.test.lib.Asserts;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.whitebox.WhiteBox;
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public class TestPinnedObjectContents {
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private static final jdk.internal.misc.Unsafe unsafe = Unsafe.getUnsafe();
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private static final WhiteBox wb = WhiteBox.getWhiteBox();
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public static long pinAndGetAddress(Object o) {
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wb.pinObject(o);
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return wb.getObjectAddress(o);
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}
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public static void main(String[] args) throws Exception {
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// Remove garbage from VM initialization.
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wb.fullGC();
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// Allocate to-be pinned object and fill with "random" data.
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final int ArraySize = 100;
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int[] o = new int[ArraySize];
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for (int i = 0; i < o.length; i++) {
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o[i] = i;
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}
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Asserts.assertTrue(!wb.isObjectInOldGen(o), "should not be in old gen already");
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// Remember memory offsets.
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long baseOffset = unsafe.arrayBaseOffset(o.getClass());
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long indexScale = unsafe.arrayIndexScale(o.getClass());
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long address = pinAndGetAddress(o);
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o = null; // And forget the (Java) reference to the int array.
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// Do garbage collections to zap the data surrounding the "dead" object.
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wb.youngGC();
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wb.youngGC();
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for (int i = 0; i < ArraySize; i++) {
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int actual = unsafe.getInt(null, address + baseOffset + i * indexScale);
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if (actual != i) {
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Asserts.fail("Pinned array at offset " + i + " should contain the value " + i + " but is " + actual);
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}
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}
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}
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}
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