Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/jvm/bytecode/StaticFieldInstruction.java @ 23:db918c531e6d
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 |
line wrap: on
line source
/* * 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.ClassInfo; import gov.nasa.jpf.vm.ElementInfo; import gov.nasa.jpf.vm.FieldInfo; import gov.nasa.jpf.vm.Instruction; import gov.nasa.jpf.vm.MethodInfo; import gov.nasa.jpf.vm.StaticElementInfo; import gov.nasa.jpf.vm.ThreadInfo; import gov.nasa.jpf.vm.bytecode.FieldInstruction; /** * class to abstract instructions accessing static fields */ public abstract class StaticFieldInstruction extends FieldInstruction { protected StaticFieldInstruction(String fieldName, String clsDescriptor, String fieldDescriptor){ super(fieldName, clsDescriptor, fieldDescriptor); } /** * on-demand initialize the ClassInfo and FieldInfo fields. Note that * classinfo might not correspond with the static className, but can be one of * the super classes. Rather than checking for this on each subsequent access, * we get the right one that declares the field here */ protected void initialize() { ClassInfo ciRef = mi.getClassInfo().resolveReferencedClass(className); FieldInfo f = ciRef.getStaticField(fname); ClassInfo ciField = f.getClassInfo(); if (!ciField.isRegistered()){ // classLoaded listeners might change/remove this field ciField.registerClass(ThreadInfo.getCurrentThread()); f = ciField.getStaticField(fname); } fi = f; } /** * who owns the field? * NOTE: this should only be used from a executeInstruction()/instructionExecuted() context */ @Override public ElementInfo getElementInfo(ThreadInfo ti){ return getFieldInfo().getClassInfo().getStaticElementInfo(); } @Override public String toPostExecString(){ StringBuilder sb = new StringBuilder(); sb.append(getMnemonic()); sb.append(' '); sb.append( fi.getFullName()); return sb.toString(); } public ClassInfo getClassInfo() { if (fi == null) { initialize(); } return fi.getClassInfo(); } @Override public FieldInfo getFieldInfo() { if (fi == null) { initialize(); } return fi; } /** * that's invariant, as opposed to InstanceFieldInstruction, so it's * not really a peek */ @Override public ElementInfo peekElementInfo (ThreadInfo ti) { return getLastElementInfo(); } @Override public StaticElementInfo getLastElementInfo() { return getFieldInfo().getClassInfo().getStaticElementInfo(); } // this can be different than ciField - the field might be in one of its // superclasses public ClassInfo getLastClassInfo(){ return getFieldInfo().getClassInfo(); } public String getLastClassName() { return getLastClassInfo().getName(); } public void accept(JVMInstructionVisitor insVisitor) { insVisitor.visit(this); } @Override public Instruction typeSafeClone(MethodInfo mi) { StaticFieldInstruction clone = null; try { clone = (StaticFieldInstruction) super.clone(); // reset the method that this insn belongs to clone.mi = mi; clone.fi = null; // ClassInfo is going to be different } catch (CloneNotSupportedException e) { e.printStackTrace(); } return clone; } }