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comparison src/main/gov/nasa/jpf/search/Simulation.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.search;
19
20
21 import gov.nasa.jpf.Config;
22 import gov.nasa.jpf.vm.VM;
23
24
25 /**
26 * this is a straight execution pseudo-search - it doesn't search at
27 * all (i.e. it doesn't backtrack), but just behaves like a 'normal' VM,
28 * going forward() until there is no next state
29 *
30 * <2do> of course it doesn't quite behave like a normal VM, since it
31 * doesn't honor thread priorities yet (needs a special scheduler)
32 *
33 * <2do> it's not really clear to me how this differs from a 'PathSearch'
34 * other than using a different scheduler. Looks like there should be just one
35 *
36 * <2do> this needs to be updated & tested
37 *
38 */
39 public class Simulation extends Search {
40
41 public Simulation (Config config, VM vm) {
42 super(config, vm);
43 }
44
45 @Override
46 public void search () {
47 int depth = 0;
48
49 depth++;
50
51 if (hasPropertyTermination()) {
52 return;
53 }
54
55 notifySearchStarted();
56
57 while (!done) {
58 if (forward()) {
59
60 if (currentError != null){
61 notifyPropertyViolated();
62
63 if (hasPropertyTermination()) {
64 return;
65 }
66 }
67
68 depth++;
69
70 } else { // no next state
71
72 // <2do> we could check for more things here. If the last insn wasn't
73 // the main return, or a System.exit() call, we could flag a JPFException
74 checkPropertyViolation();
75 done = true;
76 }
77 }
78 notifySearchFinished();
79 }
80 }