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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 attribute used for 62 * preverification of Java classes for the <a 63 * href="http://java.sun.com/j2me/"> Java 2 Micro Edition</a> 64 * (J2ME). This attribute is used by the <a 65 * href="http://java.sun.com/products/cldc/">KVM</a> and contained 66 * within the Code attribute of a method. See CLDC specification 67 * §5.3.1.2 68 * 69 * @version $Id: StackMap.java,v 1.2 2002/03/11 16:16:35 mdahm Exp $ 70 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 71 * @see Code 72 * @see StackMapEntry 73 * @see StackMapType 74 */ 75 public final class StackMap extends Attribute implements Node { 76 private int map_length; 77 private StackMapEntry[] map; // Table of stack map entries 78 79 /* 80 * @param name_index Index of name 81 * @param length Content length in bytes 82 * @param map Table of stack map entries 83 * @param constant_pool Array of constants 84 */ 85 public StackMap(int name_index, int length, StackMapEntry[] map, 86 ConstantPool constant_pool) 87 { 88 super(Constants.ATTR_STACK_MAP, name_index, length, constant_pool); 89 90 setStackMap(map); 91 } 92 93 /*** 94 * Construct object from file stream. 95 * @param name_index Index of name 96 * @param length Content length in bytes 97 * @param file Input stream 98 * @throws IOException 99 * @param constant_pool Array of constants 100 */ 101 StackMap(int name_index, int length, DataInputStream file, 102 ConstantPool constant_pool) throws IOException 103 { 104 this(name_index, length, (StackMapEntry[])null, constant_pool); 105 106 map_length = file.readUnsignedShort(); 107 map = new StackMapEntry[map_length]; 108 109 for(int i=0; i < map_length; i++) 110 map[i] = new StackMapEntry(file, constant_pool); 111 } 112 113 /*** 114 * Dump line number table attribute to file stream in binary format. 115 * 116 * @param file Output file stream 117 * @throws IOException 118 */ 119 public final void dump(DataOutputStream file) throws IOException 120 { 121 super.dump(file); 122 file.writeShort(map_length); 123 for(int i=0; i < map_length; i++) 124 map[i].dump(file); 125 } 126 127 /*** 128 * @return Array of stack map entries 129 */ 130 public final StackMapEntry[] getStackMap() { return map; } 131 132 /*** 133 * @param map Array of stack map entries 134 */ 135 public final void setStackMap(StackMapEntry[] map) { 136 this.map = map; 137 138 map_length = (map == null)? 0 : map.length; 139 } 140 141 /*** 142 * @return String representation. 143 */ 144 public final String toString() { 145 StringBuffer buf = new StringBuffer("StackMap("); 146 147 for(int i=0; i < map_length; i++) { 148 buf.append(map[i].toString()); 149 150 if(i < map_length - 1) 151 buf.append(", "); 152 } 153 154 buf.append(')'); 155 156 return buf.toString(); 157 } 158 159 /*** 160 * @return deep copy of this attribute 161 */ 162 public Attribute copy(ConstantPool constant_pool) { 163 StackMap c = (StackMap)clone(); 164 165 c.map = new StackMapEntry[map_length]; 166 for(int i=0; i < map_length; i++) 167 c.map[i] = map[i].copy(); 168 169 c.constant_pool = constant_pool; 170 return c; 171 } 172 173 /*** 174 * Called by objects that are traversing the nodes of the tree implicitely 175 * defined by the contents of a Java class. I.e., the hierarchy of methods, 176 * fields, attributes, etc. spawns a tree of objects. 177 * 178 * @param v Visitor object 179 */ 180 public void accept(Visitor v) { 181 v.visitStackMap(this); 182 } 183 184 public final int getMapLength() { return map_length; } 185 }

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