001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel.generic; 019 020import java.io.DataOutputStream; 021import java.io.IOException; 022 023import org.apache.bcel.Const; 024import org.apache.bcel.ExceptionConst; 025import org.apache.bcel.classfile.ConstantInvokeDynamic; 026import org.apache.bcel.classfile.ConstantNameAndType; 027import org.apache.bcel.classfile.ConstantPool; 028import org.apache.bcel.util.ByteSequence; 029 030/** 031 * Class for INVOKEDYNAMIC. Not an instance of InvokeInstruction, since that class 032 * expects to be able to get the class of the method. Ignores the bootstrap 033 * mechanism entirely. 034 * 035 * @see 036 * <a href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-6.html#jvms-6.5.invokedynamic"> 037 * The invokedynamic instruction in The Java Virtual Machine Specification</a> 038 * @since 6.0 039 */ 040public class INVOKEDYNAMIC extends InvokeInstruction { 041 042 /** 043 * Empty constructor needed for Instruction.readInstruction. 044 * Not to be used otherwise. 045 */ 046 INVOKEDYNAMIC() { 047 } 048 049 050 public INVOKEDYNAMIC(final int index) { 051 super(Const.INVOKEDYNAMIC, index); 052 } 053 054 055 /** 056 * Dump instruction as byte code to stream out. 057 * @param out Output stream 058 */ 059 @Override 060 public void dump( final DataOutputStream out ) throws IOException { 061 out.writeByte(super.getOpcode()); 062 out.writeShort(super.getIndex()); 063 out.writeByte(0); 064 out.writeByte(0); 065 } 066 067 068 /** 069 * Read needed data (i.e., index) from file. 070 */ 071 @Override 072 protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { 073 super.initFromFile(bytes, wide); 074 super.setLength(5); 075 bytes.readByte(); // Skip 0 byte 076 bytes.readByte(); // Skip 0 byte 077 } 078 079 080 /** 081 * @return mnemonic for instruction with symbolic references resolved 082 */ 083 @Override 084 public String toString( final ConstantPool cp ) { 085 return super.toString(cp); 086 } 087 088 089 @Override 090 public Class<?>[] getExceptions() { 091 return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_INTERFACE_METHOD_RESOLUTION, 092 ExceptionConst.UNSATISFIED_LINK_ERROR, 093 ExceptionConst.ABSTRACT_METHOD_ERROR, 094 ExceptionConst.ILLEGAL_ACCESS_ERROR, 095 ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR); 096 } 097 098 099 /** 100 * Call corresponding visitor method(s). The order is: 101 * Call visitor methods of implemented interfaces first, then 102 * call methods according to the class hierarchy in descending order, 103 * i.e., the most specific visitXXX() call comes last. 104 * 105 * @param v Visitor object 106 */ 107 @Override 108 public void accept( final Visitor v ) { 109 v.visitExceptionThrower(this); 110 v.visitTypedInstruction(this); 111 v.visitStackConsumer(this); 112 v.visitStackProducer(this); 113 v.visitLoadClass(this); 114 v.visitCPInstruction(this); 115 v.visitFieldOrMethod(this); 116 v.visitInvokeInstruction(this); 117 v.visitINVOKEDYNAMIC(this); 118 } 119 120 /** 121 * Override the parent method because our classname is held elsewhere. 122 */ 123 @Override 124 public String getClassName( final ConstantPoolGen cpg ) { 125 final ConstantPool cp = cpg.getConstantPool(); 126 final ConstantInvokeDynamic cid = (ConstantInvokeDynamic) cp.getConstant(super.getIndex(), Const.CONSTANT_InvokeDynamic); 127 return ((ConstantNameAndType) cp.getConstant(cid.getNameAndTypeIndex())).getName(cp); 128 } 129 130 131 /** 132 * Since InvokeDynamic doesn't refer to a reference type, just return java.lang.Object, 133 * as that is the only type we can say for sure the reference will be. 134 * 135 * @param cpg 136 * the ConstantPoolGen used to create the instruction 137 * @return an ObjectType for java.lang.Object 138 * @since 6.1 139 */ 140 @Override 141 public ReferenceType getReferenceType(final ConstantPoolGen cpg) { 142 return new ObjectType(Object.class.getName()); 143 } 144}