73 lines
2.7 KiB
Java
73 lines
2.7 KiB
Java
/*
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* Copyright (c) 2014, 2015, 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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/*
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* @test
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* @bug 6653795
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* @summary C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems
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* @modules java.base/jdk.internal.misc:+open
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*
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* @run main compiler.intrinsics.unsafe.UnsafeGetAddressTest
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*/
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package compiler.intrinsics.unsafe;
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import jdk.internal.misc.Unsafe;
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import java.lang.reflect.Field;
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public class UnsafeGetAddressTest {
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private static Unsafe unsafe;
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public static void main(String[] args) throws Exception {
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Class c = UnsafeGetAddressTest.class.getClassLoader().loadClass("jdk.internal.misc.Unsafe");
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Field f = c.getDeclaredField("theUnsafe");
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f.setAccessible(true);
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unsafe = (Unsafe)f.get(c);
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long address = unsafe.allocateMemory(unsafe.addressSize());
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unsafe.putAddress(address, 0x0000000080000000L);
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// from jdk.internal.misc.Unsafe.getAddress' documentation:
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// "If the native pointer is less than 64 bits wide, it is
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// extended as an unsigned number to a Java long."
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result = unsafe.getAddress(address);
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System.out.printf("1: was 0x%x, expected 0x%x\n", result,
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0x0000000080000000L);
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for (int i = 0; i < 1000000; i++) {
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result = unsafe.getAddress(address);
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}
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// The code has got compiled, check the result now
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System.out.printf("2: was 0x%x, expected 0x%x\n", result,
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0x0000000080000000L);
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if (result != 0x0000000080000000L) {
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System.out.println("Test Failed");
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System.exit(97);
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} else {
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System.out.println("Test Passed");
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}
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}
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static volatile long result;
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}
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