1 /* 2 * Copyright (c) 2015, 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 /* 26 * @test 27 * @bug 8143930 28 * @summary C1 LinearScan asserts when compiling two back-to-back CompareAndSwapLongs 29 * @modules java.base/jdk.internal.misc 30 * 31 * @run testng/othervm -Diters=200000 -XX:TieredStopAtLevel=1 32 * compiler.intrinsics.unsafe.UnsafeTwoCASLong 33 */ 34 35 package compiler.intrinsics.unsafe; 36 37 import org.testng.annotations.Test; 38 39 import java.lang.reflect.Field; 40 41 import static org.testng.Assert.*; 42 43 public class UnsafeTwoCASLong { 44 static final int ITERS = Integer.getInteger("iters", 1); 45 static final jdk.internal.misc.Unsafe UNSAFE; 46 static final long V_OFFSET; 47 48 static { 49 try { 50 Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe"); 51 f.setAccessible(true); 52 UNSAFE = (jdk.internal.misc.Unsafe) f.get(null); 53 } catch (Exception e) { 54 throw new RuntimeException("Unable to get Unsafe instance.", e); 55 } 56 57 try { 58 Field vField = UnsafeTwoCASLong.class.getDeclaredField("v"); 59 V_OFFSET = UNSAFE.objectFieldOffset(vField); 60 } catch (Exception e) { 61 throw new RuntimeException(e); 62 } 63 } 64 65 long v; 66 67 @Test 68 public void testFieldInstance() { 69 UnsafeTwoCASLong t = new UnsafeTwoCASLong(); 70 for (int c = 0; c < ITERS; c++) { 71 testAccess(t, V_OFFSET); 72 } 73 } 74 75 static void testAccess(Object base, long offset) { 76 UNSAFE.compareAndSwapLong(base, offset, 1L, 2L); 77 UNSAFE.compareAndSwapLong(base, offset, 2L, 1L); 78 } 79 80 } 81