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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
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* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
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*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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package com.sun.org.apache.bcel.internal.verifier.statics;
/* ====================================================================
* 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 (http://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 [email protected].
*
* 5. Products derived from this software may not be called "Apache",
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* 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
* .
*/
import com.sun.org.apache.bcel.internal.generic.Type;
import com.sun.org.apache.bcel.internal.verifier.exc.*;
import java.util.Hashtable;
/**
* A utility class holding the information about
* the name and the type of a local variable in
* a given slot (== index). This information
* often changes in course of byte code offsets.
*
* @version $Id: LocalVariableInfo.java,v 1.3 2007-07-19 04:34:59 ofung Exp $
* @author Enver Haase
*/
public class LocalVariableInfo{
/** The types database. KEY: String representing the offset integer. */
private Hashtable types = new Hashtable();
/** The names database. KEY: String representing the offset integer. */
private Hashtable names = new Hashtable();
/**
* Adds a name of a local variable and a certain slot to our 'names'
* (Hashtable) database.
*/
private void setName(int offset, String name){
names.put( ((Integer.toString(offset))), name);
}
/**
* Adds a type of a local variable and a certain slot to our 'types'
* (Hashtable) database.
*/
private void setType(int offset, Type t){
types.put( ((Integer.toString(offset))), t);
}
/**
* Returns the type of the local variable that uses this local
* variable slot at the given bytecode offset.
* Care for legal bytecode offsets yourself, otherwise the return value
* might be wrong.
* May return 'null' if nothing is known about the type of this local
* variable slot at the given bytecode offset.
*/
public Type getType(int offset){
return (Type) types.get(Integer.toString(offset));
}
/**
* Returns the name of the local variable that uses this local
* variable slot at the given bytecode offset.
* Care for legal bytecode offsets yourself, otherwise the return value
* might be wrong.
* May return 'null' if nothing is known about the type of this local
* variable slot at the given bytecode offset.
*/
public String getName(int offset){
return (String) (names.get(Integer.toString(offset)));
}
/**
* Adds some information about this local variable (slot).
* @throws LocalVariableInfoInconsistentException if the new information conflicts
* with already gathered information.
*/
public void add(String name, int startpc, int length, Type t) throws LocalVariableInfoInconsistentException{
for (int i=startpc; i<=startpc+length; i++){ // incl/incl-notation!
add(i,name,t);
}
}
/**
* Adds information about name and type for a given offset.
* @throws LocalVariableInfoInconsistentException if the new information conflicts
* with already gathered information.
*/
private void add(int offset, String name, Type t) throws LocalVariableInfoInconsistentException{
if (getName(offset) != null){
if (! getName(offset).equals(name)){
throw new LocalVariableInfoInconsistentException("At bytecode offset '"+offset+"' a local variable has two different names: '"+getName(offset)+"' and '"+name+"'.");
}
}
if (getType(offset) != null){
if (! getType(offset).equals(t)){
throw new LocalVariableInfoInconsistentException("At bytecode offset '"+offset+"' a local variable has two different types: '"+getType(offset)+"' and '"+t+"'.");
}
}
setName(offset, name);
setType(offset, t);
}
}