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view src/main/gov/nasa/jpf/vm/StateSet.java @ 23:db918c531e6d

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streamlined class init, which was a mixed case of registerClass()/initializeClass() and pushRequiredClinits(). Now it is a single initializeClass(ti) method which combines the previous initializeClass(), pushRequiredClinits() and pushClinit() methods. The reason for combining these is the forthcoming replacement of separately locked clinits from different DirectCallStackFrames with a single synthetic frame that calls clinits from nested synchronized blocks. This is required to model hotspot, which does cause deadlocks with concurrent init of classes that cause subclass init during their clinit executions.
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Wed, 15 Apr 2015 22:40:21 -0700
parents 61d41facf527
children
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/*
 * 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 ();
}