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