Mercurial > hg > Members > kono > jpf-core
diff src/main/gov/nasa/jpf/vm/StateSet.java @ 0:61d41facf527
initial v8 import (history reset)
author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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date | Fri, 23 Jan 2015 10:14:01 -0800 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/main/gov/nasa/jpf/vm/StateSet.java Fri Jan 23 10:14:01 2015 -0800 @@ -0,0 +1,43 @@ +/* + * Copyright (C) 2014, United States Government, as represented by the + * Administrator of the National Aeronautics and Space Administration. + * All rights reserved. + * + * The Java Pathfinder core (jpf-core) platform is licensed under the + * Apache License, Version 2.0 (the "License"); you may not use this file except + * in compliance with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0. + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package gov.nasa.jpf.vm; + + + +/** + * interface to encapsulate an ADT (conceptually a set) used to answer if + * a state has been seen already + */ +public interface StateSet { + + static final int UNKNOWN_ID = -1; + + void attach(VM vm); + + /** + * check if a state is already in the set, and add it if not. Answer + * it's numeric id + */ + int addCurrent (); + + /** + * how many states already in the set. also, index of next newly-added state. + */ + int size (); +} +