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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 org.apache.bcel.Constants; 57 import org.apache.bcel.classfile.*; 58 import java.util.StringTokenizer; 59 60 /*** 61 * Super class for the INVOKExxx family of instructions. 62 * 63 * @version $Id: InvokeInstruction.java,v 1.1.1.1 2001/10/29 20:00:20 jvanzyl Exp $ 64 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 65 */ 66 public abstract class InvokeInstruction extends FieldOrMethod 67 implements ExceptionThrower, TypedInstruction, StackConsumer, StackProducer { 68 /*** 69 * Empty constructor needed for the Class.newInstance() statement in 70 * Instruction.readInstruction(). Not to be used otherwise. 71 */ 72 InvokeInstruction() {} 73 74 /*** 75 * @param index to constant pool 76 */ 77 protected InvokeInstruction(short opcode, int index) { 78 super(opcode, index); 79 } 80 81 /*** 82 * @return mnemonic for instruction with symbolic references resolved 83 */ 84 public String toString(ConstantPool cp) { 85 Constant c = cp.getConstant(index); 86 StringTokenizer tok = new StringTokenizer(cp.constantToString(c)); 87 88 return Constants.OPCODE_NAMES[opcode] + " " + 89 tok.nextToken().replace('.', '/') + tok.nextToken(); 90 } 91 92 /*** 93 * Also works for instructions whose stack effect depends on the 94 * constant pool entry they reference. 95 * @return Number of words consumed from stack by this instruction 96 */ 97 public int consumeStack(ConstantPoolGen cpg) { 98 String signature = getSignature(cpg); 99 Type[] args = Type.getArgumentTypes(signature); 100 int sum; 101 102 if(opcode == Constants.INVOKESTATIC) 103 sum = 0; 104 else 105 sum = 1; // this reference 106 107 int n = args.length; 108 for (int i = 0; i < n; i++) 109 sum += args[i].getSize(); 110 111 return sum; 112 } 113 114 /*** 115 * Also works for instructions whose stack effect depends on the 116 * constant pool entry they reference. 117 * @return Number of words produced onto stack by this instruction 118 */ 119 public int produceStack(ConstantPoolGen cpg) { 120 return getReturnType(cpg).getSize(); 121 } 122 123 /*** @return return type of referenced method. 124 */ 125 public Type getType(ConstantPoolGen cpg) { 126 return getReturnType(cpg); 127 } 128 129 /*** @return name of referenced method. 130 */ 131 public String getMethodName(ConstantPoolGen cpg) { 132 return getName(cpg); 133 } 134 135 /*** @return return type of referenced method. 136 */ 137 public Type getReturnType(ConstantPoolGen cpg) { 138 return Type.getReturnType(getSignature(cpg)); 139 } 140 141 /*** @return argument types of referenced method. 142 */ 143 public Type[] getArgumentTypes(ConstantPoolGen cpg) { 144 return Type.getArgumentTypes(getSignature(cpg)); 145 } 146 }

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