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1 package org.apache.bcel.classfile; 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 java.io.*; 59 60 /*** 61 * This class represents a stack map entry recording the types of 62 * local variables and the the of stack items at a given byte code offset. 63 * See CLDC specification §5.3.1.2 64 * 65 * @version $Id: StackMapEntry.java,v 1.2 2002/03/11 16:16:35 mdahm Exp $ 66 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 67 * @see StackMap 68 * @see StackMapType 69 */ 70 public final class StackMapEntry implements Cloneable { 71 private int byte_code_offset; 72 private int number_of_locals; 73 private StackMapType[] types_of_locals; 74 private int number_of_stack_items; 75 private StackMapType[] types_of_stack_items; 76 private ConstantPool constant_pool; 77 78 /*** 79 * Construct object from file stream. 80 * @param file Input stream 81 * @throws IOException 82 */ 83 StackMapEntry(DataInputStream file, ConstantPool constant_pool) throws IOException 84 { 85 this(file.readShort(), file.readShort(), null, -1, null, constant_pool); 86 87 types_of_locals = new StackMapType[number_of_locals]; 88 for(int i=0; i < number_of_locals; i++) 89 types_of_locals[i] = new StackMapType(file, constant_pool); 90 91 number_of_stack_items = file.readShort(); 92 types_of_stack_items = new StackMapType[number_of_stack_items]; 93 for(int i=0; i < number_of_stack_items; i++) 94 types_of_stack_items[i] = new StackMapType(file, constant_pool); 95 } 96 97 public StackMapEntry(int byte_code_offset, int number_of_locals, 98 StackMapType[] types_of_locals, 99 int number_of_stack_items, 100 StackMapType[] types_of_stack_items, 101 ConstantPool constant_pool) { 102 this.byte_code_offset = byte_code_offset; 103 this.number_of_locals = number_of_locals; 104 this.types_of_locals = types_of_locals; 105 this.number_of_stack_items = number_of_stack_items; 106 this.types_of_stack_items = types_of_stack_items; 107 this.constant_pool = constant_pool; 108 } 109 110 /*** 111 * Dump stack map entry 112 * 113 * @param file Output file stream 114 * @throws IOException 115 */ 116 public final void dump(DataOutputStream file) throws IOException 117 { 118 file.writeShort(byte_code_offset); 119 120 file.writeShort(number_of_locals); 121 for(int i=0; i < number_of_locals; i++) 122 types_of_locals[i].dump(file); 123 124 file.writeShort(number_of_stack_items); 125 for(int i=0; i < number_of_stack_items; i++) 126 types_of_stack_items[i].dump(file); 127 } 128 129 /*** 130 * @return String representation. 131 */ 132 public final String toString() { 133 StringBuffer buf = new StringBuffer("(offset=" + byte_code_offset); 134 135 if(number_of_locals > 0) { 136 buf.append(", locals={"); 137 138 for(int i=0; i < number_of_locals; i++) { 139 buf.append(types_of_locals[i]); 140 if(i < number_of_locals - 1) 141 buf.append(", "); 142 } 143 144 buf.append("}"); 145 } 146 147 if(number_of_stack_items > 0) { 148 buf.append(", stack items={"); 149 150 for(int i=0; i < number_of_stack_items; i++) { 151 buf.append(types_of_stack_items[i]); 152 if(i < number_of_stack_items - 1) 153 buf.append(", "); 154 } 155 156 buf.append("}"); 157 } 158 159 buf.append(")"); 160 161 return buf.toString(); 162 } 163 164 165 public void setByteCodeOffset(int b) { byte_code_offset = b; } 166 public int getByteCodeOffset() { return byte_code_offset; } 167 public void setNumberOfLocals(int n) { number_of_locals = n; } 168 public int getNumberOfLocals() { return number_of_locals; } 169 public void setTypesOfLocals(StackMapType[] t) { types_of_locals = t; } 170 public StackMapType[] getTypesOfLocals() { return types_of_locals; } 171 public void setNumberOfStackItems(int n) { number_of_stack_items = n; } 172 public int getNumberOfStackItems() { return number_of_stack_items; } 173 public void setTypesOfStackItems(StackMapType[] t) { types_of_stack_items = t; } 174 public StackMapType[] getTypesOfStackItems() { return types_of_stack_items; } 175 176 /*** 177 * @return deep copy of this object 178 */ 179 public StackMapEntry copy() { 180 try { 181 return (StackMapEntry)clone(); 182 } catch(CloneNotSupportedException e) {} 183 184 return null; 185 } 186 187 /*** 188 * Called by objects that are traversing the nodes of the tree implicitely 189 * defined by the contents of a Java class. I.e., the hierarchy of methods, 190 * fields, attributes, etc. spawns a tree of objects. 191 * 192 * @param v Visitor object 193 */ 194 public void accept(Visitor v) { 195 v.visitStackMapEntry(this); 196 } 197 198 /*** 199 * @return Constant pool used by this object. 200 */ 201 public final ConstantPool getConstantPool() { return constant_pool; } 202 203 /*** 204 * @param constant_pool Constant pool to be used for this object. 205 */ 206 public final void setConstantPool(ConstantPool constant_pool) { 207 this.constant_pool = constant_pool; 208 } 209 }

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