Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotSpeculationLog.java @ 23387:a920338dd4d4
remove JVMCIError and UnsafeUtil classes (JDK-8156759)
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Wed, 11 May 2016 15:54:36 +0200 |
parents | 39f25354aeee |
children | 9e1235406b59 |
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/* * Copyright (c) 2014, 2014, 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. */ package jdk.vm.ci.hotspot; import java.util.Collection; import java.util.HashSet; import java.util.Set; import java.util.concurrent.ConcurrentLinkedQueue; import jdk.vm.ci.meta.JavaConstant; import jdk.vm.ci.meta.SpeculationLog; public class HotSpotSpeculationLog implements SpeculationLog { /** Written by the C++ code that performs deoptimization. */ private volatile Object lastFailed; /** All speculations that have been a deoptimization reason. */ private Set<SpeculationReason> failedSpeculations; /** Strong references to all reasons embedded in the current nmethod. */ private volatile Collection<SpeculationReason> speculations; @Override public synchronized void collectFailedSpeculations() { if (lastFailed != null) { if (failedSpeculations == null) { failedSpeculations = new HashSet<>(2); } failedSpeculations.add((SpeculationReason) lastFailed); lastFailed = null; speculations = null; } } @Override public boolean maySpeculate(SpeculationReason reason) { if (failedSpeculations != null && failedSpeculations.contains(reason)) { return false; } return true; } @Override public JavaConstant speculate(SpeculationReason reason) { assert maySpeculate(reason); /* * Objects referenced from nmethods are weak references. We need a strong reference to the * reason objects that are embedded in nmethods, so we add them to the speculations * collection. */ if (speculations == null) { synchronized (this) { if (speculations == null) { speculations = new ConcurrentLinkedQueue<>(); } } } speculations.add(reason); return HotSpotObjectConstantImpl.forObject(reason); } @Override public synchronized boolean hasSpeculations() { return speculations != null && !speculations.isEmpty(); } }