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233 lines
7.6 KiB
233 lines
7.6 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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package com.sun.org.apache.bcel.internal.classfile;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import com.sun.org.apache.bcel.internal.Constants;
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import java.io.*;
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/**
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* This class represents an entry in the exception table of the <em>Code</em>
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* attribute and is used only there. It contains a range in which a
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* particular exception handler is active.
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*
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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* @see Code
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*/
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public final class CodeException
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implements Cloneable, Constants, Node, Serializable
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{
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private int start_pc; // Range in the code the exception handler is
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private int end_pc; // active. start_pc is inclusive, end_pc exclusive
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private int handler_pc; /* Starting address of exception handler, i.e.,
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* an offset from start of code.
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*/
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private int catch_type; /* If this is zero the handler catches any
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* exception, otherwise it points to the
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* exception class which is to be caught.
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*/
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/**
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* Initialize from another object.
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*/
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public CodeException(CodeException c) {
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this(c.getStartPC(), c.getEndPC(), c.getHandlerPC(), c.getCatchType());
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}
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/**
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* Construct object from file stream.
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* @param file Input stream
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* @throws IOException
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*/
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CodeException(DataInputStream file) throws IOException
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{
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this(file.readUnsignedShort(), file.readUnsignedShort(),
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file.readUnsignedShort(), file.readUnsignedShort());
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}
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/**
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* @param start_pc Range in the code the exception handler is active,
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* start_pc is inclusive while
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* @param end_pc is exclusive
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* @param handler_pc Starting address of exception handler, i.e.,
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* an offset from start of code.
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* @param catch_type If zero the handler catches any
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* exception, otherwise it points to the exception class which is
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* to be caught.
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*/
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public CodeException(int start_pc, int end_pc, int handler_pc,
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int catch_type)
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{
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this.start_pc = start_pc;
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this.end_pc = end_pc;
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this.handler_pc = handler_pc;
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this.catch_type = catch_type;
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}
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/**
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* Called by objects that are traversing the nodes of the tree implicitely
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* defined by the contents of a Java class. I.e., the hierarchy of methods,
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* fields, attributes, etc. spawns a tree of objects.
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*
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* @param v Visitor object
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*/
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public void accept(Visitor v) {
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v.visitCodeException(this);
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}
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/**
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* Dump code exception to file stream in binary format.
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*
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* @param file Output file stream
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* @throws IOException
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*/
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public final void dump(DataOutputStream file) throws IOException
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{
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file.writeShort(start_pc);
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file.writeShort(end_pc);
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file.writeShort(handler_pc);
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file.writeShort(catch_type);
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}
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/**
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* @return 0, if the handler catches any exception, otherwise it points to
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* the exception class which is to be caught.
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*/
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public final int getCatchType() { return catch_type; }
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/**
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* @return Exclusive end index of the region where the handler is active.
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*/
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public final int getEndPC() { return end_pc; }
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/**
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* @return Starting address of exception handler, relative to the code.
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*/
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public final int getHandlerPC() { return handler_pc; }
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/**
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* @return Inclusive start index of the region where the handler is active.
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*/
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public final int getStartPC() { return start_pc; }
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/**
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* @param catch_type.
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*/
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public final void setCatchType(int catch_type) {
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this.catch_type = catch_type;
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}
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/**
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* @param end_pc end of handled block
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*/
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public final void setEndPC(int end_pc) {
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this.end_pc = end_pc;
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}
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/**
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* @param handler_pc where the actual code is
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*/
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public final void setHandlerPC(int handler_pc) {
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this.handler_pc = handler_pc;
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}
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/**
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* @param start_pc start of handled block
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*/
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public final void setStartPC(int start_pc) {
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this.start_pc = start_pc;
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}
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/**
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* @return String representation.
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*/
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public final String toString() {
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return "CodeException(start_pc = " + start_pc +
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", end_pc = " + end_pc +
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", handler_pc = " + handler_pc + ", catch_type = " + catch_type + ")";
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}
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/**
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* @return String representation.
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*/
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public final String toString(ConstantPool cp, boolean verbose) {
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String str;
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if(catch_type == 0)
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str = "<Any exception>(0)";
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else
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str = Utility.compactClassName(cp.getConstantString(catch_type, CONSTANT_Class), false) +
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(verbose? "(" + catch_type + ")" : "");
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return start_pc + "\t" + end_pc + "\t" + handler_pc + "\t" + str;
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}
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public final String toString(ConstantPool cp) {
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return toString(cp, true);
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}
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/**
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* @return deep copy of this object
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*/
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public CodeException copy() {
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try {
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return (CodeException)clone();
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} catch(CloneNotSupportedException e) {}
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return null;
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}
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}
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