1 /* 2 * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved. 3 */ 4 /* 5 * Licensed to the Apache Software Foundation (ASF) under one or more 6 * contributor license agreements. See the NOTICE file distributed with 7 * this work for additional information regarding copyright ownership. 8 * The ASF licenses this file to You under the Apache License, Version 2.0 9 * (the "License"); you may not use this file except in compliance with 10 * the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package com.sun.org.apache.bcel.internal.generic; 22 23 import java.io.DataOutputStream; 24 import java.io.IOException; 25 26 import com.sun.org.apache.bcel.internal.Const; 27 import com.sun.org.apache.bcel.internal.ExceptionConst; 28 import com.sun.org.apache.bcel.internal.classfile.ConstantInvokeDynamic; 29 import com.sun.org.apache.bcel.internal.classfile.ConstantNameAndType; 30 import com.sun.org.apache.bcel.internal.classfile.ConstantPool; 31 import com.sun.org.apache.bcel.internal.util.ByteSequence; 32 33 /** 34 * Class for INVOKEDYNAMIC. Not an instance of InvokeInstruction, since that class 35 * expects to be able to get the class of the method. Ignores the bootstrap 36 * mechanism entirely. 37 * 38 * @see 39 * <a href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-6.html#jvms-6.5.invokedynamic"> 40 * The invokedynamic instruction in The Java Virtual Machine Specification</a> 41 * @since 6.0 42 * @LastModified: Jan 2020 43 */ 44 public class INVOKEDYNAMIC extends InvokeInstruction { 45 46 /** 47 * Empty constructor needed for Instruction.readInstruction. 48 * Not to be used otherwise. 49 */ INVOKEDYNAMIC()50 INVOKEDYNAMIC() { 51 } 52 53 INVOKEDYNAMIC(final int index)54 public INVOKEDYNAMIC(final int index) { 55 super(Const.INVOKEDYNAMIC, index); 56 } 57 58 59 /** 60 * Dump instruction as byte code to stream out. 61 * @param out Output stream 62 */ 63 @Override dump( final DataOutputStream out )64 public void dump( final DataOutputStream out ) throws IOException { 65 out.writeByte(super.getOpcode()); 66 out.writeShort(super.getIndex()); 67 out.writeByte(0); 68 out.writeByte(0); 69 } 70 71 72 /** 73 * Read needed data (i.e., index) from file. 74 */ 75 @Override initFromFile( final ByteSequence bytes, final boolean wide )76 protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { 77 super.initFromFile(bytes, wide); 78 super.setLength(5); 79 bytes.readByte(); // Skip 0 byte 80 bytes.readByte(); // Skip 0 byte 81 } 82 83 84 /** 85 * @return mnemonic for instruction with symbolic references resolved 86 */ 87 @Override toString( final ConstantPool cp )88 public String toString( final ConstantPool cp ) { 89 return super.toString(cp); 90 } 91 92 93 @Override getExceptions()94 public Class<?>[] getExceptions() { 95 return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_INTERFACE_METHOD_RESOLUTION, 96 ExceptionConst.UNSATISFIED_LINK_ERROR, 97 ExceptionConst.ABSTRACT_METHOD_ERROR, 98 ExceptionConst.ILLEGAL_ACCESS_ERROR, 99 ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR); 100 } 101 102 103 /** 104 * Call corresponding visitor method(s). The order is: 105 * Call visitor methods of implemented interfaces first, then 106 * call methods according to the class hierarchy in descending order, 107 * i.e., the most specific visitXXX() call comes last. 108 * 109 * @param v Visitor object 110 */ 111 @Override accept( final Visitor v )112 public void accept( final Visitor v ) { 113 v.visitExceptionThrower(this); 114 v.visitTypedInstruction(this); 115 v.visitStackConsumer(this); 116 v.visitStackProducer(this); 117 v.visitLoadClass(this); 118 v.visitCPInstruction(this); 119 v.visitFieldOrMethod(this); 120 v.visitInvokeInstruction(this); 121 v.visitINVOKEDYNAMIC(this); 122 } 123 124 /** 125 * Override the parent method because our classname is held elsewhere. 126 * 127 * @param cpg the ConstantPool generator 128 * @deprecated in FieldOrMethod 129 * 130 * @return name of the referenced class/interface 131 */ 132 @Override 133 @Deprecated getClassName( final ConstantPoolGen cpg )134 public String getClassName( final ConstantPoolGen cpg ) { 135 final ConstantPool cp = cpg.getConstantPool(); 136 final ConstantInvokeDynamic cid = (ConstantInvokeDynamic) cp.getConstant(super.getIndex(), Const.CONSTANT_InvokeDynamic); 137 return ((ConstantNameAndType) cp.getConstant(cid.getNameAndTypeIndex())).getName(cp); 138 } 139 140 141 /** 142 * Since InvokeDynamic doesn't refer to a reference type, just return java.lang.Object, 143 * as that is the only type we can say for sure the reference will be. 144 * 145 * @param cpg 146 * the ConstantPoolGen used to create the instruction 147 * @return an ObjectType for java.lang.Object 148 * @since 6.1 149 */ 150 @Override getReferenceType(final ConstantPoolGen cpg)151 public ReferenceType getReferenceType(final ConstantPoolGen cpg) { 152 return new ObjectType(Object.class.getName()); 153 } 154 } 155