Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/jvm/bytecode/RUNSTART.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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/* * 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.jvm.bytecode; import gov.nasa.jpf.vm.Instruction; import gov.nasa.jpf.vm.ThreadInfo; /** * this is an artificial instruction that is automatically prepended to * a run()/main() method call. * * The main purpose is to have a special instruction marking the beginning * of a new thread execution which does not cause CGs or is otherwise subject * to execution semantics that change the program state. * * For instance, without it we would have to add a new ThreadInfo state to * determine if the first instruction within this thread was re-executed or * just happens to be the first transition we execute within this thread * */ public class RUNSTART extends Instruction implements JVMInstruction { public RUNSTART () { } @Override public Instruction execute (ThreadInfo ti) { // nothing here, we could have used a NOP return getNext(ti); } public static final int OPCODE = 257; @Override public int getByteCode () { return OPCODE; } @Override public boolean isExtendedInstruction() { return true; } @Override public void accept(JVMInstructionVisitor insVisitor) { insVisitor.visit(this); } }