| /* |
| * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8143930 |
| * @summary C1 LinearScan asserts when compiling two back-to-back CompareAndSwapLongs |
| * @modules java.base/jdk.internal.misc:+open |
| * |
| * @run testng/othervm -Diters=200000 -XX:TieredStopAtLevel=1 |
| * compiler.intrinsics.unsafe.UnsafeTwoCASLong |
| */ |
| |
| package compiler.intrinsics.unsafe; |
| |
| import org.testng.annotations.Test; |
| |
| import java.lang.reflect.Field; |
| |
| import static org.testng.Assert.*; |
| |
| public class UnsafeTwoCASLong { |
| static final int ITERS = Integer.getInteger("iters", 1); |
| static final jdk.internal.misc.Unsafe UNSAFE; |
| static final long V_OFFSET; |
| |
| static { |
| try { |
| Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
| f.setAccessible(true); |
| UNSAFE = (jdk.internal.misc.Unsafe) f.get(null); |
| } catch (Exception e) { |
| throw new RuntimeException("Unable to get Unsafe instance.", e); |
| } |
| |
| try { |
| Field vField = UnsafeTwoCASLong.class.getDeclaredField("v"); |
| V_OFFSET = UNSAFE.objectFieldOffset(vField); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| long v; |
| |
| @Test |
| public void testFieldInstance() { |
| UnsafeTwoCASLong t = new UnsafeTwoCASLong(); |
| for (int c = 0; c < ITERS; c++) { |
| testAccess(t, V_OFFSET); |
| } |
| } |
| |
| static void testAccess(Object base, long offset) { |
| UNSAFE.compareAndSetLong(base, offset, 1L, 2L); |
| UNSAFE.compareAndSetLong(base, offset, 2L, 1L); |
| } |
| |
| } |