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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 import java.io.*; 57 import org.apache.bcel.util.ByteSequence; 58 import org.apache.bcel.classfile.ConstantPool; 59 import org.apache.bcel.ExceptionConstants; 60 61 /*** 62 * MULTIANEWARRAY - Create new mutidimensional array of references 63 * <PRE>Stack: ..., count1, [count2, ...] -> ..., arrayref</PRE> 64 * 65 * @version $Id: MULTIANEWARRAY.java,v 1.1.1.1 2001/10/29 20:00:24 jvanzyl Exp $ 66 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 67 */ 68 public class MULTIANEWARRAY extends CPInstruction implements LoadClass, AllocationInstruction, ExceptionThrower { 69 private short dimensions; 70 71 /*** 72 * Empty constructor needed for the Class.newInstance() statement in 73 * Instruction.readInstruction(). Not to be used otherwise. 74 */ 75 MULTIANEWARRAY() {} 76 77 public MULTIANEWARRAY(int index, short dimensions) { 78 super(org.apache.bcel.Constants.MULTIANEWARRAY, index); 79 80 if(dimensions < 1) 81 throw new ClassGenException("Invalid dimensions value: " + dimensions); 82 83 this.dimensions = dimensions; 84 length = 4; 85 } 86 87 /*** 88 * Dump instruction as byte code to stream out. 89 * @param out Output stream 90 */ 91 public void dump(DataOutputStream out) throws IOException { 92 out.writeByte(opcode); 93 out.writeShort(index); 94 out.writeByte(dimensions); 95 } 96 97 /*** 98 * Read needed data (i.e., no. dimension) from file. 99 */ 100 protected void initFromFile(ByteSequence bytes, boolean wide) 101 throws IOException 102 { 103 super.initFromFile(bytes, wide); 104 dimensions = bytes.readByte(); 105 length = 4; 106 } 107 108 /*** 109 * @return number of dimensions to be created 110 */ 111 public final short getDimensions() { return dimensions; } 112 113 /*** 114 * @return mnemonic for instruction 115 */ 116 public String toString(boolean verbose) { 117 return super.toString(verbose) + " " + index + " " + dimensions; 118 } 119 120 /*** 121 * @return mnemonic for instruction with symbolic references resolved 122 */ 123 public String toString(ConstantPool cp) { 124 return super.toString(cp) + " " + dimensions; 125 } 126 127 /*** 128 * Also works for instructions whose stack effect depends on the 129 * constant pool entry they reference. 130 * @return Number of words consumed from stack by this instruction 131 */ 132 public int consumeStack(ConstantPoolGen cpg) { return dimensions; } 133 134 public Class[] getExceptions() { 135 Class[] cs = new Class[2 + ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length]; 136 137 System.arraycopy(ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION, 0, 138 cs, 0, ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length); 139 140 cs[ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length+1] = ExceptionConstants.NEGATIVE_ARRAY_SIZE_EXCEPTION; 141 cs[ExceptionConstants.EXCS_CLASS_AND_INTERFACE_RESOLUTION.length] = ExceptionConstants.ILLEGAL_ACCESS_ERROR; 142 143 return cs; 144 } 145 146 public ObjectType getLoadClassType(ConstantPoolGen cpg) { 147 Type t = getType(cpg); 148 149 if (t instanceof ArrayType){ 150 t = ((ArrayType) t).getBasicType(); 151 } 152 153 return (t instanceof ObjectType)? (ObjectType) t : null; 154 } 155 156 /*** 157 * Call corresponding visitor method(s). The order is: 158 * Call visitor methods of implemented interfaces first, then 159 * call methods according to the class hierarchy in descending order, 160 * i.e., the most specific visitXXX() call comes last. 161 * 162 * @param v Visitor object 163 */ 164 public void accept(Visitor v) { 165 v.visitLoadClass(this); 166 v.visitAllocationInstruction(this); 167 v.visitExceptionThrower(this); 168 v.visitTypedInstruction(this); 169 v.visitCPInstruction(this); 170 v.visitMULTIANEWARRAY(this); 171 } 172 }

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