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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotSpeculationLog.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents 7d8e0c328b64
children
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1 /*
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2 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
db4254246f9a Remove Constant.forObject and Constant.asObject to improve compiler/VM separation
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package jdk.vm.ci.hotspot;
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24
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25 import java.util.Collection;
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26 import java.util.HashSet;
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27 import java.util.Set;
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28 import java.util.concurrent.ConcurrentLinkedQueue;
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29
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30 import jdk.vm.ci.meta.JavaConstant;
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31 import jdk.vm.ci.meta.SpeculationLog;
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32
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33 public class HotSpotSpeculationLog implements SpeculationLog {
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34
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35 /** Written by the C++ code that performs deoptimization. */
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36 private volatile Object lastFailed;
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37
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38 /** All speculations that have caused a deoptimization. */
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39 private Set<SpeculationReason> failedSpeculations;
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40
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41 /** Strong references to all reasons embedded in the current nmethod. */
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42 private Collection<SpeculationReason> speculations;
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43
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44 @Override
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45 public synchronized void collectFailedSpeculations() {
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46 if (lastFailed != null) {
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47 if (failedSpeculations == null) {
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48 failedSpeculations = new HashSet<>(2);
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49 }
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50 failedSpeculations.add((SpeculationReason) lastFailed);
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51 lastFailed = null;
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52 speculations = null;
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53 }
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54 }
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55
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56 @Override
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57 public synchronized boolean maySpeculate(SpeculationReason reason) {
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58 if (failedSpeculations != null && failedSpeculations.contains(reason)) {
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59 return false;
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60 }
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61 return true;
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62 }
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63
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64 @Override
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65 public JavaConstant speculate(SpeculationReason reason) {
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66 assert maySpeculate(reason);
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67
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68 /*
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69 * Objects referenced from nmethods are weak references. We need a strong reference to the
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70 * reason objects that are embedded in nmethods, so we add them to the speculations
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71 * collection.
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72 */
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73 synchronized (this) {
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74 if (speculations == null) {
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75 speculations = new ConcurrentLinkedQueue<>();
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76 }
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77 speculations.add(reason);
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78 }
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79
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80 return HotSpotObjectConstantImpl.forObject(reason);
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81 }
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82
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83 @Override
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84 public synchronized boolean hasSpeculations() {
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85 return speculations != null && !speculations.isEmpty();
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86 }
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87 }