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comparison 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
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21628:35da7c00e2fa 21629:36cf15e3219e
1 /*
2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.jvmci.meta;
24
25 import java.util.*;
26 import java.util.concurrent.*;
27
28 /**
29 * Manages a list of unique deoptimization reasons.
30 *
31 */
32 public abstract class SpeculationLog {
33 private volatile Object lastFailed;
34 private volatile Collection<Object> speculations;
35 private Set<Object> failedSpeculations;
36
37 public synchronized void collectFailedSpeculations() {
38 if (lastFailed != null) {
39 if (failedSpeculations == null) {
40 failedSpeculations = new HashSet<>(2);
41 }
42 failedSpeculations.add(lastFailed);
43 lastFailed = null;
44 speculations = null;
45 }
46 }
47
48 public boolean maySpeculate(Object reason) {
49 if (failedSpeculations != null && failedSpeculations.contains(reason)) {
50 return false;
51 }
52 return true;
53 }
54
55 protected void addSpeculation(Object reason) {
56 assert maySpeculate(reason);
57 if (speculations == null) {
58 synchronized (this) {
59 if (speculations == null) {
60 speculations = new ConcurrentLinkedQueue<>();
61 }
62 }
63 }
64 speculations.add(reason);
65 }
66
67 public abstract JavaConstant speculate(Object reason);
68 }