Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/jvm/bytecode/JVMArrayElementInstruction.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 |
parents | |
children | 3517702bd768 |
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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.ElementInfo; import gov.nasa.jpf.vm.ThreadInfo; import gov.nasa.jpf.vm.bytecode.ArrayElementInstruction; /** * abstract class for operations that access elements of arrays */ public abstract class JVMArrayElementInstruction extends ArrayElementInstruction { protected int arrayRef; protected int index; // the accessed element // we need this to be abstract because of the LongArrayStore insns @Override abstract public int peekIndex (ThreadInfo ti); abstract protected int peekArrayRef (ThreadInfo ti); public boolean isReferenceArray() { return false; } @Override public ElementInfo getElementInfo (ThreadInfo ti){ if (isCompleted(ti)){ return ti.getElementInfo(arrayRef); } else { int ref = peekArrayRef(ti); return ti.getElementInfo(arrayRef); } } /** * only makes sense from an executeInstruction() or instructionExecuted() listener, * it is undefined outside of insn exec notifications */ public int getArrayRef (ThreadInfo ti){ if (ti.isPreExec()){ return peekArrayRef(ti); } else { return arrayRef; } } @Override public ElementInfo peekArrayElementInfo (ThreadInfo ti){ int aref = getArrayRef(ti); return ti.getElementInfo(aref); } public int getIndex (ThreadInfo ti){ if (!isCompleted(ti)){ return peekIndex(ti); } else { return index; } } /** * return size of array elements in stack words (long,double: 2, all other: 1) * e.g. used to determine where the object reference is on the stack * * should probably be abstract, but there are lots of subclasses and only LongArrayLoad/Store insns have different size */ protected int getElementSize () { return 1; } @Override public abstract boolean isRead(); }