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annotate graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/SpeculationLog.java @ 21629:36cf15e3219e

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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
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1 /*
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2 * Copyright (c) 2012, 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
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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 com.oracle.jvmci.meta;
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24
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25 import java.util.*;
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26 import java.util.concurrent.*;
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27
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28 /**
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29 * Manages a list of unique deoptimization reasons.
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30 *
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31 */
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32 public abstract class SpeculationLog {
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33 private volatile Object lastFailed;
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34 private volatile Collection<Object> speculations;
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35 private Set<Object> failedSpeculations;
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36
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37 public synchronized void collectFailedSpeculations() {
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38 if (lastFailed != null) {
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39 if (failedSpeculations == null) {
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40 failedSpeculations = new HashSet<>(2);
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41 }
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42 failedSpeculations.add(lastFailed);
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43 lastFailed = null;
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44 speculations = null;
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45 }
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46 }
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47
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48 public boolean maySpeculate(Object reason) {
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49 if (failedSpeculations != null && failedSpeculations.contains(reason)) {
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50 return false;
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51 }
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52 return true;
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53 }
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54
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55 protected void addSpeculation(Object reason) {
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56 assert maySpeculate(reason);
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57 if (speculations == null) {
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58 synchronized (this) {
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59 if (speculations == null) {
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60 speculations = new ConcurrentLinkedQueue<>();
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61 }
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62 }
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63 }
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64 speculations.add(reason);
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65 }
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66
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67 public abstract JavaConstant speculate(Object reason);
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68 }