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package org.aspectj.apache.bcel.verifier.structurals;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (https://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <https://www.apache.org/>.
*/
import org.aspectj.apache.bcel.generic.Type;
import org.aspectj.apache.bcel.generic.ReferenceType;
import org.aspectj.apache.bcel.verifier.exc.*;
/**
* This class implements an array of local variables used for symbolic JVM
* simulation.
*
* @version $Id: LocalVariables.java,v 1.2 2008/05/28 23:53:02 aclement Exp $
* @author <A HREF="https://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
*/
public class LocalVariables{
/** The Type[] containing the local variable slots. */
private Type[] locals;
/**
* Creates a new LocalVariables object.
*/
public LocalVariables(int maxLocals){
locals = new Type[maxLocals];
for (int i=0; i<maxLocals; i++){
locals[i] = Type.UNKNOWN;
}
}
/**
* Returns a deep copy of this object; i.e. the clone
* operates on a new local variable array.
* However, the Type objects in the array are shared.
*/
protected Object clone(){
LocalVariables lvs = new LocalVariables(locals.length);
for (int i=0; i<locals.length; i++){
lvs.locals[i] = this.locals[i];
}
return lvs;
}
/**
* Returns the type of the local variable slot i.
*/
public Type get(int i){
return locals[i];
}
/**
* Returns a (correctly typed) clone of this object.
* This is equivalent to ((LocalVariables) this.clone()).
*/
public LocalVariables getClone(){
return (LocalVariables) this.clone();
}
/**
* Returns the number of local variable slots this
* LocalVariables instance has.
*/
public int maxLocals(){
return locals.length;
}
/**
* Sets a new Type for the given local variable slot.
*/
public void set(int i, Type type){
if (type == Type.BYTE || type == Type.SHORT || type == Type.BOOLEAN || type == Type.CHAR){
throw new AssertionViolatedException("LocalVariables do not know about '"+type+"'. Use Type.INT instead.");
}
locals[i] = type;
}
/*
* Fulfills the general contract of Object.equals().
*/
public boolean equals(Object o){
if (!(o instanceof LocalVariables)) return false;
LocalVariables lv = (LocalVariables) o;
if (this.locals.length != lv.locals.length) return false;
for (int i=0; i<this.locals.length; i++){
if (!this.locals[i].equals(lv.locals[i])){
//System.out.println(this.locals[i]+" is not "+lv.locals[i]);
return false;
}
}
return true;
}
/**
* Merges two local variables sets as described in the Java Virtual Machine Specification,
* Second Edition, section 4.9.2, page 146.
*/
public void merge(LocalVariables lv){
if (this.locals.length != lv.locals.length){
throw new AssertionViolatedException("Merging LocalVariables of different size?!? From different methods or what?!?");
}
for (int i=0; i<locals.length; i++){
merge(lv, i);
}
}
/**
* Merges a single local variable.
*
* @see #merge(LocalVariables)
*/
private void merge(LocalVariables lv, int i){
// We won't accept an unitialized object if we know it was initialized;
// compare vmspec2, 4.9.4, last paragraph.
if ( (!(locals[i] instanceof UninitializedObjectType)) && (lv.locals[i] instanceof UninitializedObjectType) ){
throw new StructuralCodeConstraintException("Backwards branch with an uninitialized object in the local variables detected.");
}
// Even harder, what about _different_ uninitialized object types?!
if ( (!(locals[i].equals(lv.locals[i]))) && (locals[i] instanceof UninitializedObjectType) && (lv.locals[i] instanceof UninitializedObjectType) ){
throw new StructuralCodeConstraintException("Backwards branch with an uninitialized object in the local variables detected.");
}
// If we just didn't know that it was initialized, we have now learned.
if (locals[i] instanceof UninitializedObjectType){
if (! (lv.locals[i] instanceof UninitializedObjectType)){
locals[i] = ((UninitializedObjectType) locals[i]).getInitialized();
}
}
if ((locals[i] instanceof ReferenceType) && (lv.locals[i] instanceof ReferenceType)){
if (! locals[i].equals(lv.locals[i])){ // needed in case of two UninitializedObjectType instances
Type sup = ((ReferenceType) locals[i]).getFirstCommonSuperclass((ReferenceType) (lv.locals[i]));
if (sup != null){
locals[i] = sup;
}
else{
// We should have checked this in Pass2!
throw new AssertionViolatedException("Could not load all the super classes of '"+locals[i]+"' and '"+lv.locals[i]+"'.");
}
}
}
else{
if (! (locals[i].equals(lv.locals[i])) ){
/*TODO
if ((locals[i] instanceof org.aspectj.apache.bcel.generic.ReturnaddressType) && (lv.locals[i] instanceof org.aspectj.apache.bcel.generic.ReturnaddressType)){
//System.err.println("merging "+locals[i]+" and "+lv.locals[i]);
throw new AssertionViolatedException("Merging different ReturnAddresses: '"+locals[i]+"' and '"+lv.locals[i]+"'.");
}
*/
locals[i] = Type.UNKNOWN;
}
}
}
/**
* Returns a String representation of this object.
*/
public String toString(){
String s = new String();
for (int i=0; i<locals.length; i++){
s += Integer.toString(i)+": "+locals[i]+"\n";
}
return s;
}
/**
* Replaces all occurences of u in this local variables set
* with an "initialized" ObjectType.
*/
public void initializeObject(UninitializedObjectType u){
for (int i=0; i<locals.length; i++){
if (locals[i] == u){
locals[i] = u.getInitialized();
}
}
}
}
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