Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/vm/SingleLockThresholdFli.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
4 * All rights reserved.
5 *
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0.
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package gov.nasa.jpf.vm;
19
20 /**
21 * a threshold FieldLockInfo with a single lock candidate
22 * This is the base version that does destructive updates. Override singleLockThresholdFli for a persistent version
23 */
24 public class SingleLockThresholdFli extends ThresholdFieldLockInfo {
25 protected int lockRef;
26
27 SingleLockThresholdFli (ThreadInfo ti, int lockRef, int remainingChecks) {
28 super( remainingChecks);
29
30 tiLastCheck = ti;
31 this.lockRef = lockRef;
32 }
33
34 @Override
35 protected int[] getCandidateLockSet() {
36 int[] set = { lockRef };
37 return set;
38 }
39
40 /**
41 * override this for path local flis
42 */
43 protected SingleLockThresholdFli singleLockThresholdFli (ThreadInfo ti, int lockRef, int remainingChecks){
44 this.lockRef = lockRef;
45 this.tiLastCheck = ti;
46 this.remainingChecks = remainingChecks;
47
48 return this;
49 }
50
51 @Override
52 public FieldLockInfo checkProtection (ThreadInfo ti, ElementInfo ei, FieldInfo fi) {
53 int[] currentLockRefs = ti.getLockedObjectReferences();
54 int nLocks = currentLockRefs.length;
55 int nRemaining = Math.max(0, remainingChecks--);
56
57 for (int i=0; i<nLocks; i++) {
58 if (currentLockRefs[i] == lockRef) {
59 return singleLockThresholdFli( ti, lockRef, nRemaining);
60 }
61 }
62
63 checkFailedLockAssumption(ti, ei, fi);
64 return empty;
65 }
66
67 /**
68 * only called at the end of the gc on all live objects. The recycled ones
69 * are either already nulled in the heap, or are not marked as live
70 */
71 @Override
72 public FieldLockInfo cleanUp (Heap heap) {
73 ElementInfo ei = heap.get(lockRef);
74 if (!heap.isAlive(ei)) {
75 return FieldLockInfo.empty;
76 } else {
77 return this;
78 }
79 }
80
81 @Override
82 public String toString() {
83 return ("SingleLockThresholdFli {remainingChecks="+remainingChecks+",lock="+lockRef + '}');
84 }
85
86 }