1/* 2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/* 25 * @test 26 * @bug 8143930 27 * @summary C1 LinearScan asserts when compiling two back-to-back CompareAndSwapLongs 28 * @modules java.base/jdk.internal.misc:+open 29 * 30 * @run testng/othervm -Diters=200000 -XX:TieredStopAtLevel=1 31 * compiler.intrinsics.unsafe.UnsafeTwoCASLong 32 */ 33 34package compiler.intrinsics.unsafe; 35 36import org.testng.annotations.Test; 37 38import java.lang.reflect.Field; 39 40import static org.testng.Assert.*; 41 42public class UnsafeTwoCASLong { 43 static final int ITERS = Integer.getInteger("iters", 1); 44 static final jdk.internal.misc.Unsafe UNSAFE; 45 static final long V_OFFSET; 46 47 static { 48 try { 49 Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe"); 50 f.setAccessible(true); 51 UNSAFE = (jdk.internal.misc.Unsafe) f.get(null); 52 } catch (Exception e) { 53 throw new RuntimeException("Unable to get Unsafe instance.", e); 54 } 55 56 try { 57 Field vField = UnsafeTwoCASLong.class.getDeclaredField("v"); 58 V_OFFSET = UNSAFE.objectFieldOffset(vField); 59 } catch (Exception e) { 60 throw new RuntimeException(e); 61 } 62 } 63 64 long v; 65 66 @Test 67 public void testFieldInstance() { 68 UnsafeTwoCASLong t = new UnsafeTwoCASLong(); 69 for (int c = 0; c < ITERS; c++) { 70 testAccess(t, V_OFFSET); 71 } 72 } 73 74 static void testAccess(Object base, long offset) { 75 UNSAFE.compareAndSetLong(base, offset, 1L, 2L); 76 UNSAFE.compareAndSetLong(base, offset, 2L, 1L); 77 } 78 79} 80