Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/jvm/bytecode/ArrayLoadInstruction.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.ArrayIndexOutOfBoundsExecutiveException; import gov.nasa.jpf.vm.ElementInfo; import gov.nasa.jpf.vm.Instruction; import gov.nasa.jpf.vm.MJIEnv; import gov.nasa.jpf.vm.Scheduler; import gov.nasa.jpf.vm.StackFrame; import gov.nasa.jpf.vm.ThreadInfo; /** * abstraction for all array load instructions * * ..., array, index => ..., value */ public abstract class ArrayLoadInstruction extends JVMArrayElementInstruction implements JVMInstruction { @Override public Instruction execute (ThreadInfo ti) { StackFrame frame = ti.getModifiableTopFrame(); index = frame.peek(); arrayRef = frame.peek(1); // ..,arrayRef,idx if (arrayRef == MJIEnv.NULL) { return ti.createAndThrowException("java.lang.NullPointerException"); } ElementInfo eiArray = ti.getElementInfo(arrayRef); Scheduler scheduler = ti.getScheduler(); if (scheduler.canHaveSharedArrayCG( ti, this, eiArray, index)){ // don't modify the frame before this eiArray = scheduler.updateArraySharedness(ti, eiArray, index); if (scheduler.setsSharedArrayCG( ti, this, eiArray, index)){ return this; } } frame.pop(2); // now we can pop index and array reference try { push(frame, eiArray, index); Object elementAttr = eiArray.getElementAttr(index); if (elementAttr != null) { if (getElementSize() == 1) { frame.setOperandAttr(elementAttr); } else { frame.setLongOperandAttr(elementAttr); } } return getNext(ti); } catch (ArrayIndexOutOfBoundsExecutiveException ex) { return ex.getInstruction(); } } protected boolean isReference () { return false; } /** * only makes sense pre-exec */ @Override public int peekArrayRef (ThreadInfo ti){ return ti.getTopFrame().peek(1); } // wouldn't really be required for loads, but this is a general // ArrayInstruction API @Override public int peekIndex (ThreadInfo ti){ return ti.getTopFrame().peek(); } protected abstract void push (StackFrame frame, ElementInfo e, int index) throws ArrayIndexOutOfBoundsExecutiveException; @Override public boolean isRead() { return true; } @Override public void accept(JVMInstructionVisitor insVisitor) { insVisitor.visit(this); } }