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1 package org.apache.bcel.verifier.structurals; 2 3 /* ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache BCEL" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * "Apache BCEL", nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 */ 56 57 import org.apache.bcel.generic.*; 58 import java.util.HashSet; 59 import java.util.Hashtable; 60 61 /*** 62 * This class allows easy access to ExceptionHandler objects. 63 * 64 * @version $Id: ExceptionHandlers.java,v 1.1.1.1 2001/10/29 20:00:38 jvanzyl Exp $ 65 * @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A> 66 */ 67 public class ExceptionHandlers{ 68 /*** 69 * The ExceptionHandler instances. 70 * Key: InstructionHandle objects, Values: HashSet<ExceptionHandler> instances. 71 */ 72 private Hashtable exceptionhandlers; 73 74 /*** 75 * Constructor. Creates a new ExceptionHandlers instance. 76 */ 77 public ExceptionHandlers(MethodGen mg){ 78 exceptionhandlers = new Hashtable(); 79 CodeExceptionGen[] cegs = mg.getExceptionHandlers(); 80 for (int i=0; i<cegs.length; i++){ 81 ExceptionHandler eh = new ExceptionHandler(cegs[i].getCatchType(), cegs[i].getHandlerPC()); 82 for (InstructionHandle ih=cegs[i].getStartPC(); ih != cegs[i].getEndPC().getNext(); ih=ih.getNext()){ 83 HashSet hs; 84 hs = (HashSet) exceptionhandlers.get(ih); 85 if (hs == null){ 86 hs = new HashSet(); 87 exceptionhandlers.put(ih, hs); 88 } 89 hs.add(eh); 90 } 91 } 92 } 93 94 /*** 95 * Returns all the ExceptionHandler instances representing exception 96 * handlers that protect the instruction ih. 97 */ 98 public ExceptionHandler[] getExceptionHandlers(InstructionHandle ih){ 99 HashSet hs = (HashSet) exceptionhandlers.get(ih); 100 if (hs == null) return new ExceptionHandler[0]; 101 else{ 102 ExceptionHandler[] ret = new ExceptionHandler[hs.size()]; 103 return (ExceptionHandler[]) (hs.toArray(ret)); 104 } 105 } 106 107 }

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