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1 package org.apache.bcel.verifier.statics; 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.Type; 58 import org.apache.bcel.verifier.exc.*; 59 import java.util.Hashtable; 60 61 /*** 62 * A utility class holding the information about 63 * the name and the type of a local variable in 64 * a given slot (== index). This information 65 * often changes in course of byte code offsets. 66 * 67 * @version $Id: LocalVariableInfo.java,v 1.2 2002/06/13 09:32:50 enver Exp $ 68 * @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A> 69 */ 70 public class LocalVariableInfo{ 71 72 /*** The types database. KEY: String representing the offset integer. */ 73 private Hashtable types = new Hashtable(); 74 /*** The names database. KEY: String representing the offset integer. */ 75 private Hashtable names = new Hashtable(); 76 77 /*** 78 * Adds a name of a local variable and a certain slot to our 'names' 79 * (Hashtable) database. 80 */ 81 private void setName(int offset, String name){ 82 names.put( ((Integer.toString(offset))), name); 83 } 84 /*** 85 * Adds a type of a local variable and a certain slot to our 'types' 86 * (Hashtable) database. 87 */ 88 private void setType(int offset, Type t){ 89 types.put( ((Integer.toString(offset))), t); 90 } 91 92 /*** 93 * Returns the type of the local variable that uses this local 94 * variable slot at the given bytecode offset. 95 * Care for legal bytecode offsets yourself, otherwise the return value 96 * might be wrong. 97 * May return 'null' if nothing is known about the type of this local 98 * variable slot at the given bytecode offset. 99 */ 100 public Type getType(int offset){ 101 return (Type) types.get(Integer.toString(offset)); 102 } 103 /*** 104 * Returns the name of the local variable that uses this local 105 * variable slot at the given bytecode offset. 106 * Care for legal bytecode offsets yourself, otherwise the return value 107 * might be wrong. 108 * May return 'null' if nothing is known about the type of this local 109 * variable slot at the given bytecode offset. 110 */ 111 public String getName(int offset){ 112 return (String) (names.get(Integer.toString(offset))); 113 } 114 /*** 115 * Adds some information about this local variable (slot). 116 * @throws LocalVariableInfoInconsistentException if the new information conflicts 117 * with already gathered information. 118 */ 119 public void add(String name, int startpc, int length, Type t) throws LocalVariableInfoInconsistentException{ 120 for (int i=startpc; i<=startpc+length; i++){ // incl/incl-notation! 121 add(i,name,t); 122 } 123 } 124 125 /*** 126 * Adds information about name and type for a given offset. 127 * @throws LocalVariableInfoInconsistentException if the new information conflicts 128 * with already gathered information. 129 */ 130 private void add(int offset, String name, Type t) throws LocalVariableInfoInconsistentException{ 131 if (getName(offset) != null){ 132 if (! getName(offset).equals(name)){ 133 throw new LocalVariableInfoInconsistentException("At bytecode offset '"+offset+"' a local variable has two different names: '"+getName(offset)+"' and '"+name+"'."); 134 } 135 } 136 if (getType(offset) != null){ 137 if (! getType(offset).equals(t)){ 138 throw new LocalVariableInfoInconsistentException("At bytecode offset '"+offset+"' a local variable has two different types: '"+getType(offset)+"' and '"+t+"'."); 139 } 140 } 141 setName(offset, name); 142 setType(offset, t); 143 } 144 }

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