90 lines
3.5 KiB
Java
90 lines
3.5 KiB
Java
/*
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* Copyright (C) 2020 THL A29 Limited, a Tencent company. 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 8250825
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* @summary "assert(field != __null) failed: missing field" in TypeOopPtr::TypeOopPt(...) with misaligned unsafe accesses
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* @run main/othervm -XX:-TieredCompilation -Xcomp
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* -XX:CompileCommand=compileonly,TestMisalignedUnsafeAccess::test* TestMisalignedUnsafeAccess
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*/
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import java.lang.reflect.Field;
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import jdk.internal.misc.Unsafe;
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import jdk.test.lib.Asserts;
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public class TestMisalignedUnsafeAccess {
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private static final Unsafe UNSAFE = Unsafe.getUnsafe();
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private static short onHeapStaticMemory; // For static field testing
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private static final Object onHeapStaticMemoryBase;
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private static final long onHeapStaticMemoryOffset;
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private short onHeapInstanceMemory; // For instance field testing
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private static final long onHeapInstanceMemoryOffset;
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static {
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try {
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Field staticField = TestMisalignedUnsafeAccess.class.getDeclaredField("onHeapStaticMemory");
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onHeapStaticMemoryBase = UNSAFE.staticFieldBase(staticField);
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onHeapStaticMemoryOffset = UNSAFE.staticFieldOffset(staticField);
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Field instanceField = TestMisalignedUnsafeAccess.class.getDeclaredField("onHeapInstanceMemory");
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onHeapInstanceMemoryOffset = UNSAFE.objectFieldOffset(instanceField);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static void testStaticField() {
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byte b1 = 0x01;
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byte b2 = 0x02;
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UNSAFE.putByte(onHeapStaticMemoryBase, onHeapStaticMemoryOffset, b1);
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UNSAFE.putByte(onHeapStaticMemoryBase, onHeapStaticMemoryOffset + 1, b2);
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Asserts.assertEquals(b1, UNSAFE.getByte(onHeapStaticMemoryBase, onHeapStaticMemoryOffset));
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Asserts.assertEquals(b2, UNSAFE.getByte(onHeapStaticMemoryBase, onHeapStaticMemoryOffset + 1));
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}
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public static void testInstanceField() {
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byte b1 = 0x03;
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byte b2 = 0x04;
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TestMisalignedUnsafeAccess obj = new TestMisalignedUnsafeAccess();
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UNSAFE.putByte(obj, onHeapInstanceMemoryOffset, b1);
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UNSAFE.putByte(obj, onHeapInstanceMemoryOffset + 1, b2);
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Asserts.assertEquals(b1, UNSAFE.getByte(obj, onHeapInstanceMemoryOffset));
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Asserts.assertEquals(b2, UNSAFE.getByte(obj, onHeapInstanceMemoryOffset + 1));
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}
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public static void main(String[] args) {
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testStaticField();
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testInstanceField();
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}
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}
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