| /* |
| * Copyright (c) 2018, Red Hat, Inc. 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 8212673 |
| * @summary Node::eqv_uncast() shouldn't step over load barriers unconditionally |
| * @library /test/lib / |
| * @modules java.base/jdk.internal.misc |
| * |
| * @build sun.hotspot.WhiteBox |
| * @run driver ClassFileInstaller sun.hotspot.WhiteBox |
| * sun.hotspot.WhiteBox$WhiteBoxPermission |
| * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseOnStackReplacement -XX:-TieredCompilation -XX:-BackgroundCompilation EqvUncastStepOverBarrier |
| */ |
| |
| import sun.hotspot.WhiteBox; |
| import java.lang.reflect.Method; |
| |
| public class EqvUncastStepOverBarrier { |
| static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); |
| |
| private static Object field = new A(); |
| |
| public static void main(String[] args) throws Exception { |
| for (int i = 0; i < 20_000; i++) { |
| test(); |
| test(); |
| test_helper(null, 0); |
| } |
| Method m = EqvUncastStepOverBarrier.class.getDeclaredMethod("test"); |
| WHITE_BOX.enqueueMethodForCompilation(m, 4); |
| if (!WHITE_BOX.isMethodCompiled(m, false)) { |
| throw new RuntimeException("Method compilation failed"); |
| } |
| } |
| |
| private static Object test() { |
| Object o = field; |
| if (o == null) {} |
| for (int i = 1; i < 100; i *= 2) { |
| int j = 0; |
| for (; j < 4; j++) ; |
| o = test_helper(o, j); |
| } |
| return o; |
| } |
| |
| private static Object test_helper(Object o, int j) { |
| if (j == 4) { |
| A a = (A) o; |
| o = a; |
| } else { |
| o = new Object(); |
| } |
| return o; |
| } |
| |
| private static class A { |
| } |
| } |