Mercurial > hg > graal-jvmci-8
diff graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/SpeculationLog.java @ 21629:36cf15e3219e
Move HotSpotResolvedJavaMethod.getSpeculationLog to ResolvedJavaMethod
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
---|---|
date | Mon, 01 Jun 2015 15:14:39 +0200 |
parents | graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/SpeculationLog.java@f5b549811bac |
children |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/SpeculationLog.java Mon Jun 01 15:14:39 2015 +0200 @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2012, 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 com.oracle.jvmci.meta; + +import java.util.*; +import java.util.concurrent.*; + +/** + * Manages a list of unique deoptimization reasons. + * + */ +public abstract class SpeculationLog { + private volatile Object lastFailed; + private volatile Collection<Object> speculations; + private Set<Object> failedSpeculations; + + public synchronized void collectFailedSpeculations() { + if (lastFailed != null) { + if (failedSpeculations == null) { + failedSpeculations = new HashSet<>(2); + } + failedSpeculations.add(lastFailed); + lastFailed = null; + speculations = null; + } + } + + public boolean maySpeculate(Object reason) { + if (failedSpeculations != null && failedSpeculations.contains(reason)) { + return false; + } + return true; + } + + protected void addSpeculation(Object reason) { + assert maySpeculate(reason); + if (speculations == null) { + synchronized (this) { + if (speculations == null) { + speculations = new ConcurrentLinkedQueue<>(); + } + } + } + speculations.add(reason); + } + + public abstract JavaConstant speculate(Object reason); +}