Mercurial > hg > graal-compiler
view graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/SpeculationLog.java @ 18564:966081b8e830
guard against null element in HotSpotConstantReflectionProvider.readStableFieldValue
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 27 Nov 2014 11:45:13 +0100 |
parents | 9619ba4daf4c |
children | 1cde96b96673 |
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/* * 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.graal.api.code; import java.util.*; import java.util.concurrent.*; import com.oracle.graal.api.meta.*; /** * 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); }