Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/vm/StateSet.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
22 /**
23 * interface to encapsulate an ADT (conceptually a set) used to answer if
24 * a state has been seen already
25 */
26 public interface StateSet {
27
28 static final int UNKNOWN_ID = -1;
29
30 void attach(VM vm);
31
32 /**
33 * check if a state is already in the set, and add it if not. Answer
34 * it's numeric id
35 */
36 int addCurrent ();
37
38 /**
39 * how many states already in the set. also, index of next newly-added state.
40 */
41 int size ();
42 }
43