| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| package com.sun.org.apache.bcel.internal.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 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 |
| * <http://www.apache.org/>. |
| */ |
| |
| import com.sun.org.apache.bcel.internal.classfile.*; |
| |
| /** |
| * 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. |
| * |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| * @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.<BR> |
| * |
| * 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(ConstantPoolGen 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 final void setStartPC(InstructionHandle start_pc) { |
| BranchInstruction.notifyTargetChanging(this.start_pc, this); |
| this.start_pc = start_pc; |
| BranchInstruction.notifyTargetChanged(this.start_pc, this); |
| } |
| |
| /* Set end of handler |
| * @param end_pc End of handled region (inclusive) |
| */ |
| public final void setEndPC(InstructionHandle end_pc) { |
| BranchInstruction.notifyTargetChanging(this.end_pc, this); |
| this.end_pc = end_pc; |
| BranchInstruction.notifyTargetChanged(this.end_pc, this); |
| } |
| |
| /* Set handler code |
| * @param handler_pc Start of handler |
| */ |
| public final void setHandlerPC(InstructionHandle handler_pc) { |
| BranchInstruction.notifyTargetChanging(this.handler_pc, this); |
| this.handler_pc = handler_pc; |
| BranchInstruction.notifyTargetChanged(this.handler_pc, this); |
| } |
| |
| /** |
| * @param old_ih old target, either start or end |
| * @param new_ih new target |
| */ |
| @Override |
| 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 |
| */ |
| @Override |
| 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; } |
| |
| @Override |
| public String toString() { |
| return "CodeExceptionGen(" + start_pc + ", " + end_pc + ", " + handler_pc + ")"; |
| } |
| |
| @Override |
| public Object clone() { |
| try { |
| return super.clone(); |
| } catch(CloneNotSupportedException e) { |
| System.err.println(e); |
| return null; |
| } |
| } |
| } |