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test/compiler/intrinsics/unsafe/UnsafeGetAddressTest.java@9ab9f254cfe2 (annotated)

test/compiler/intrinsics/unsafe/UnsafeGetAddressTest.java

Mon, 24 Mar 2014 08:43:10 -0700

author

poonam

date

Mon, 24 Mar 2014 08:43:10 -0700

changeset 6425

9ab9f254cfe2

parent 0

f90c822e73f8

permissions

-rw-r--r--

6653795: C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems
Summary: Native pointers less than 64 bits wide should be extended as an unsigned number.
Reviewed-by: kvn, kevinw

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*/
aoqi@0	23
aoqi@0	24	/*
aoqi@0	25	* @test
aoqi@0	26	* @bug 6653795
aoqi@0	27	* @summary C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems
aoqi@0	28	* @run main UnsafeGetAddressTest
aoqi@0	29	*
aoqi@0	30	*/
aoqi@0	31
aoqi@0	32	import sun.misc.Unsafe;
aoqi@0	33	import java.lang.reflect.*;
aoqi@0	34
aoqi@0	35	public class UnsafeGetAddressTest {
aoqi@0	36	private static Unsafe unsafe;
aoqi@0	37
aoqi@0	38	public static void main(String[] args) throws Exception {
aoqi@0	39	Class c = UnsafeGetAddressTest.class.getClassLoader().loadClass("sun.misc.Unsafe");
aoqi@0	40	Field f = c.getDeclaredField("theUnsafe");
aoqi@0	41	f.setAccessible(true);
aoqi@0	42	unsafe = (Unsafe)f.get(c);
aoqi@0	43
aoqi@0	44	long address = unsafe.allocateMemory(unsafe.addressSize());
aoqi@0	45	unsafe.putAddress(address, 0x0000000080000000L);
aoqi@0	46	// from sun.misc.Unsafe.getAddress' documentation:
aoqi@0	47	// "If the native pointer is less than 64 bits wide, it is
aoqi@0	48	// extended as an unsigned number to a Java long."
aoqi@0	49	result = unsafe.getAddress(address);
aoqi@0	50	System.out.printf("1: was 0x%x, expected 0x%x\n", result,
aoqi@0	51	0x0000000080000000L);
aoqi@0	52	for (int i = 0; i < 1000000; i++) {
aoqi@0	53	result = unsafe.getAddress(address);
aoqi@0	54	}
aoqi@0	55
aoqi@0	56	// The code has got compiled, check the result now
aoqi@0	57	System.out.printf("2: was 0x%x, expected 0x%x\n", result,
aoqi@0	58	0x0000000080000000L);
aoqi@0	59	if (result != 0x0000000080000000L) {
aoqi@0	60	System.out.println("Test Failed");
aoqi@0	61	System.exit(97);
aoqi@0	62	} else {
aoqi@0	63	System.out.println("Test Passed");
aoqi@0	64	}
aoqi@0	65	}
aoqi@0	66	static volatile long result;
aoqi@0	67	}
aoqi@0	68