| package org.apache.bcel.classfile; |
| |
| /* ==================================================================== |
| * 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 org.apache.bcel.Constants; |
| import java.io.*; |
| |
| /** |
| * This class represents an entry in the exception table of the <em>Code</em> |
| * attribute and is used only there. It contains a range in which a |
| * particular exception handler is active. |
| * |
| * @version $Id$ |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| * @see Code |
| */ |
| public final class CodeException implements Cloneable, Constants, Node { |
| private int start_pc; // Range in the code the exception handler is |
| private int end_pc; // active. start_pc is inclusive, end_pc exclusive |
| private int handler_pc; /* Starting address of exception handler, i.e., |
| * an offset from start of code. |
| */ |
| private int catch_type; /* If this is zero the handler catches any |
| * exception, otherwise it points to the |
| * exception class which is to be caught. |
| */ |
| /** |
| * Initialize from another object. |
| */ |
| public CodeException(CodeException c) { |
| this(c.getStartPC(), c.getEndPC(), c.getHandlerPC(), c.getCatchType()); |
| } |
| |
| /** |
| * Construct object from file stream. |
| * @param file Input stream |
| * @throw IOException |
| */ |
| CodeException(DataInputStream file) throws IOException |
| { |
| this(file.readUnsignedShort(), file.readUnsignedShort(), |
| file.readUnsignedShort(), file.readUnsignedShort()); |
| } |
| |
| /** |
| * @param start_pc Range in the code the exception handler is active, |
| * start_pc is inclusive while |
| * @param end_pc is exclusive |
| * @param handler_pc Starting address of exception handler, i.e., |
| * an offset from start of code. |
| * @param catch_type If zero the handler catches any |
| * exception, otherwise it points to the exception class which is |
| * to be caught. |
| */ |
| public CodeException(int start_pc, int end_pc, int handler_pc, |
| int catch_type) |
| { |
| this.start_pc = start_pc; |
| this.end_pc = end_pc; |
| this.handler_pc = handler_pc; |
| this.catch_type = catch_type; |
| } |
| |
| /** |
| * Called by objects that are traversing the nodes of the tree implicitely |
| * defined by the contents of a Java class. I.e., the hierarchy of methods, |
| * fields, attributes, etc. spawns a tree of objects. |
| * |
| * @param v Visitor object |
| */ |
| public void accept(Visitor v) { |
| v.visitCodeException(this); |
| } |
| /** |
| * Dump code exception to file stream in binary format. |
| * |
| * @param file Output file stream |
| * @throw IOException |
| */ |
| public final void dump(DataOutputStream file) throws IOException |
| { |
| file.writeShort(start_pc); |
| file.writeShort(end_pc); |
| file.writeShort(handler_pc); |
| file.writeShort(catch_type); |
| } |
| |
| /** |
| * @return 0, if the handler catches any exception, otherwise it points to |
| * the exception class which is to be caught. |
| */ |
| public final int getCatchType() { return catch_type; } |
| |
| /** |
| * @return Exclusive end index of the region where the handler is active. |
| */ |
| public final int getEndPC() { return end_pc; } |
| |
| /** |
| * @return Starting address of exception handler, relative to the code. |
| */ |
| public final int getHandlerPC() { return handler_pc; } |
| |
| /** |
| * @return Inclusive start index of the region where the handler is active. |
| */ |
| public final int getStartPC() { return start_pc; } |
| |
| /** |
| * @param catch_type. |
| */ |
| public final void setCatchType(int catch_type) { |
| this.catch_type = catch_type; |
| } |
| |
| /** |
| * @param end_pc end of handled block |
| */ |
| public final void setEndPC(int end_pc) { |
| this.end_pc = end_pc; |
| } |
| |
| /** |
| * @param handler_pc where the actual code is |
| */ |
| public final void setHandlerPC(int handler_pc) { |
| this.handler_pc = handler_pc; |
| } |
| |
| /** |
| * @param start_pc start of handled block |
| */ |
| public final void setStartPC(int start_pc) { |
| this.start_pc = start_pc; |
| } |
| |
| /** |
| * @return String representation. |
| */ |
| public final String toString() { |
| return "CodeException(start_pc = " + start_pc + |
| ", end_pc = " + end_pc + |
| ", handler_pc = " + handler_pc + ", catch_type = " + catch_type + ")"; |
| } |
| |
| /** |
| * @return String representation. |
| */ |
| public final String toString(ConstantPool cp, boolean verbose) { |
| String str; |
| |
| if(catch_type == 0) |
| str = "<Any exception>(0)"; |
| else |
| str = Utility.compactClassName(cp.getConstantString(catch_type, CONSTANT_Class), false) + |
| (verbose? "(" + catch_type + ")" : ""); |
| |
| return start_pc + "\t" + end_pc + "\t" + handler_pc + "\t" + str; |
| } |
| |
| public final String toString(ConstantPool cp) { |
| return toString(cp, true); |
| } |
| |
| /** |
| * @return deep copy of this object |
| */ |
| public CodeException copy() { |
| try { |
| return (CodeException)clone(); |
| } catch(CloneNotSupportedException e) {} |
| |
| return null; |
| } |
| } |