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1 package org.apache.bcel.generic; 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.Constants; 58 import org.apache.bcel.classfile.*; 59 60 /*** 61 * This class represents an exception handler, i.e., specifies the region where 62 * a handler is active and an instruction where the actual handling is done. 63 * pool as parameters. Opposed to the JVM specification the end of the handled 64 * region is set to be inclusive, i.e. all instructions between start and end 65 * are protected including the start and end instructions (handles) themselves. 66 * The end of the region is automatically mapped to be exclusive when calling 67 * getCodeException(), i.e., there is no difference semantically. 68 * 69 * @version $Id: CodeExceptionGen.java,v 1.2 2002/07/11 19:39:04 mdahm Exp $ 70 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 71 * @see MethodGen 72 * @see CodeException 73 * @see InstructionHandle 74 */ 75 public final class CodeExceptionGen 76 implements InstructionTargeter, Cloneable, java.io.Serializable { 77 private InstructionHandle start_pc; 78 private InstructionHandle end_pc; 79 private InstructionHandle handler_pc; 80 private ObjectType catch_type; 81 82 /*** 83 * Add an exception handler, i.e., specify region where a handler is active and an 84 * instruction where the actual handling is done. 85 * 86 * @param start_pc Start of handled region (inclusive) 87 * @param end_pc End of handled region (inclusive) 88 * @param handler_pc Where handling is done 89 * @param catch_type which exception is handled, null for ANY 90 */ 91 public CodeExceptionGen(InstructionHandle start_pc, InstructionHandle end_pc, 92 InstructionHandle handler_pc, ObjectType catch_type) { 93 setStartPC(start_pc); 94 setEndPC(end_pc); 95 setHandlerPC(handler_pc); 96 this.catch_type = catch_type; 97 } 98 99 /*** 100 * Get CodeException object.<BR> 101 * 102 * This relies on that the instruction list has already been dumped 103 * to byte code or or that the `setPositions' methods has been 104 * called for the instruction list. 105 * 106 * @param cp constant pool 107 */ 108 public CodeException getCodeException(ConstantPoolGen cp) { 109 return new CodeException(start_pc.getPosition(), 110 end_pc.getPosition() + end_pc.getInstruction().getLength(), 111 handler_pc.getPosition(), 112 (catch_type == null)? 0 : cp.addClass(catch_type)); 113 } 114 115 /* Set start of handler 116 * @param start_pc Start of handled region (inclusive) 117 */ 118 public void setStartPC(InstructionHandle start_pc) { 119 BranchInstruction.notifyTarget(this.start_pc, start_pc, this); 120 this.start_pc = start_pc; 121 } 122 123 /* Set end of handler 124 * @param end_pc End of handled region (inclusive) 125 */ 126 public void setEndPC(InstructionHandle end_pc) { 127 BranchInstruction.notifyTarget(this.end_pc, end_pc, this); 128 this.end_pc = end_pc; 129 } 130 131 /* Set handler code 132 * @param handler_pc Start of handler 133 */ 134 public void setHandlerPC(InstructionHandle handler_pc) { 135 BranchInstruction.notifyTarget(this.handler_pc, handler_pc, this); 136 this.handler_pc = handler_pc; 137 } 138 139 /*** 140 * @param old_ih old target, either start or end 141 * @param new_ih new target 142 */ 143 public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) { 144 boolean targeted = false; 145 146 if(start_pc == old_ih) { 147 targeted = true; 148 setStartPC(new_ih); 149 } 150 151 if(end_pc == old_ih) { 152 targeted = true; 153 setEndPC(new_ih); 154 } 155 156 if(handler_pc == old_ih) { 157 targeted = true; 158 setHandlerPC(new_ih); 159 } 160 161 if(!targeted) 162 throw new ClassGenException("Not targeting " + old_ih + ", but {" + start_pc + ", " + 163 end_pc + ", " + handler_pc + "}"); 164 } 165 166 /*** 167 * @return true, if ih is target of this handler 168 */ 169 public boolean containsTarget(InstructionHandle ih) { 170 return (start_pc == ih) || (end_pc == ih) || (handler_pc == ih); 171 } 172 173 /*** Sets the type of the Exception to catch. Set 'null' for ANY. */ 174 public void setCatchType(ObjectType catch_type) { this.catch_type = catch_type; } 175 /*** Gets the type of the Exception to catch, 'null' for ANY. */ 176 public ObjectType getCatchType() { return catch_type; } 177 178 /*** @return start of handled region (inclusive) 179 */ 180 public InstructionHandle getStartPC() { return start_pc; } 181 182 /*** @return end of handled region (inclusive) 183 */ 184 public InstructionHandle getEndPC() { return end_pc; } 185 186 /*** @return start of handler 187 */ 188 public InstructionHandle getHandlerPC() { return handler_pc; } 189 190 public String toString() { 191 return "CodeExceptionGen(" + start_pc + ", " + end_pc + ", " + handler_pc + ")"; 192 } 193 194 public Object clone() { 195 try { 196 return super.clone(); 197 } catch(CloneNotSupportedException e) { 198 System.err.println(e); 199 return null; 200 } 201 } 202 }

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