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comparison graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/SpeculationLog.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/SpeculationLog.java@1cde96b96673
children f5b549811bac
comparison
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21555:d12eaef9af72 21556:48c1ebd24120
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.code;
24
25 import com.oracle.jvmci.meta.JavaConstant;
26 import java.util.*;
27 import java.util.concurrent.*;
28
29
30 /**
31 * Manages a list of unique deoptimization reasons.
32 *
33 */
34 public abstract class SpeculationLog {
35 private volatile Object lastFailed;
36 private volatile Collection<Object> speculations;
37 private Set<Object> failedSpeculations;
38
39 public synchronized void collectFailedSpeculations() {
40 if (lastFailed != null) {
41 if (failedSpeculations == null) {
42 failedSpeculations = new HashSet<>(2);
43 }
44 failedSpeculations.add(lastFailed);
45 lastFailed = null;
46 speculations = null;
47 }
48 }
49
50 public boolean maySpeculate(Object reason) {
51 if (failedSpeculations != null && failedSpeculations.contains(reason)) {
52 return false;
53 }
54 return true;
55 }
56
57 protected void addSpeculation(Object reason) {
58 assert maySpeculate(reason);
59 if (speculations == null) {
60 synchronized (this) {
61 if (speculations == null) {
62 speculations = new ConcurrentLinkedQueue<>();
63 }
64 }
65 }
66 speculations.add(reason);
67 }
68
69 public abstract JavaConstant speculate(Object reason);
70 }