| /* |
| * 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 jdk.vm.ci.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); |
| } |