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package org.aspectj.apache.bcel.generic;
/* ====================================================================
* 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",
* "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
* .
*/
import org.aspectj.apache.bcel.classfile.CodeException;
import org.aspectj.apache.bcel.classfile.ConstantPool;
/**
* This class represents an exception handler, i.e., specifies the region where
* a handler is active and an instruction where the actual handling is done.
* pool as parameters. Opposed to the JVM specification the end of the handled
* region is set to be inclusive, i.e. all instructions between start and end
* are protected including the start and end instructions (handles) themselves.
* The end of the region is automatically mapped to be exclusive when calling
* getCodeException(), i.e., there is no difference semantically.
*
* @version $Id: CodeExceptionGen.java,v 1.5 2008/05/28 23:52:56 aclement Exp $
* @author M. Dahm
* @see MethodGen
* @see CodeException
* @see InstructionHandle
*/
public final class CodeExceptionGen
implements InstructionTargeter, Cloneable, java.io.Serializable {
private InstructionHandle start_pc;
private InstructionHandle end_pc;
private InstructionHandle handler_pc;
private ObjectType catch_type;
/**
* Add an exception handler, i.e., specify region where a handler is active and an
* instruction where the actual handling is done.
*
* @param start_pc Start of handled region (inclusive)
* @param end_pc End of handled region (inclusive)
* @param handler_pc Where handling is done
* @param catch_type which exception is handled, null for ANY
*/
public CodeExceptionGen(InstructionHandle start_pc, InstructionHandle end_pc,
InstructionHandle handler_pc, ObjectType catch_type) {
setStartPC(start_pc);
setEndPC(end_pc);
setHandlerPC(handler_pc);
this.catch_type = catch_type;
}
/**
* Get CodeException object.
*
* This relies on that the instruction list has already been dumped
* to byte code or or that the `setPositions' methods has been
* called for the instruction list.
*
* @param cp constant pool
*/
public CodeException getCodeException(ConstantPool cp) {
return new CodeException(start_pc.getPosition(),
end_pc.getPosition() + end_pc.getInstruction().getLength(),
handler_pc.getPosition(),
(catch_type == null)? 0 : cp.addClass(catch_type));
}
/* Set start of handler
* @param start_pc Start of handled region (inclusive)
*/
public void setStartPC(InstructionHandle start_pc) {
InstructionBranch.notifyTarget(this.start_pc, start_pc, this);
this.start_pc = start_pc;
}
/* Set end of handler
* @param end_pc End of handled region (inclusive)
*/
public void setEndPC(InstructionHandle end_pc) {
InstructionBranch.notifyTarget(this.end_pc, end_pc, this);
this.end_pc = end_pc;
}
/* Set handler code
* @param handler_pc Start of handler
*/
public void setHandlerPC(InstructionHandle handler_pc) {
InstructionBranch.notifyTarget(this.handler_pc, handler_pc, this);
this.handler_pc = handler_pc;
}
/**
* @param old_ih old target, either start or end
* @param new_ih new target
*/
public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
boolean targeted = false;
if(start_pc == old_ih) {
targeted = true;
setStartPC(new_ih);
}
if(end_pc == old_ih) {
targeted = true;
setEndPC(new_ih);
}
if(handler_pc == old_ih) {
targeted = true;
setHandlerPC(new_ih);
}
if(!targeted)
throw new ClassGenException("Not targeting " + old_ih + ", but {" + start_pc + ", " +
end_pc + ", " + handler_pc + "}");
}
/**
* @return true, if ih is target of this handler
*/
public boolean containsTarget(InstructionHandle ih) {
return (start_pc == ih) || (end_pc == ih) || (handler_pc == ih);
}
/** Sets the type of the Exception to catch. Set 'null' for ANY. */
public void setCatchType(ObjectType catch_type) { this.catch_type = catch_type; }
/** Gets the type of the Exception to catch, 'null' for ANY. */
public ObjectType getCatchType() { return catch_type; }
/** @return start of handled region (inclusive)
*/
public InstructionHandle getStartPC() { return start_pc; }
/** @return end of handled region (inclusive)
*/
public InstructionHandle getEndPC() { return end_pc; }
/** @return start of handler
*/
public InstructionHandle getHandlerPC() { return handler_pc; }
public String toString() {
return "CodeExceptionGen(" + start_pc + ", " + end_pc + ", " + handler_pc + ")";
}
public Object clone() {
try {
return super.clone();
} catch(CloneNotSupportedException e) {
System.err.println(e);
return null;
}
}
}
