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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.bcel.generic;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.bcel.Const;
import org.apache.bcel.ExceptionConst;
import org.apache.bcel.classfile.ConstantInvokeDynamic;
import org.apache.bcel.classfile.ConstantNameAndType;
import org.apache.bcel.classfile.ConstantPool;
import org.apache.bcel.util.ByteSequence;
/**
* Class for INVOKEDYNAMIC. Not an instance of InvokeInstruction, since that class
* expects to be able to get the class of the method. Ignores the bootstrap
* mechanism entirely.
*
* @version $Id: InvokeInstruction.java 1152072 2011-07-29 01:54:05Z dbrosius $
* @see
* <a href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-6.html#jvms-6.5.invokedynamic">
* The invokedynamic instruction in The Java Virtual Machine Specification</a>
* @since 6.0
*/
public class INVOKEDYNAMIC extends InvokeInstruction {
/**
* Empty constructor needed for the Class.newInstance() statement in
* Instruction.readInstruction(). Not to be used otherwise.
*/
INVOKEDYNAMIC() {
}
public INVOKEDYNAMIC(final int index) {
super(Const.INVOKEDYNAMIC, index);
}
/**
* Dump instruction as byte code to stream out.
* @param out Output stream
*/
@Override
public void dump( final DataOutputStream out ) throws IOException {
out.writeByte(super.getOpcode());
out.writeShort(super.getIndex());
out.writeByte(0);
out.writeByte(0);
}
/**
* Read needed data (i.e., index) from file.
*/
@Override
protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
super.initFromFile(bytes, wide);
super.setLength(5);
bytes.readByte(); // Skip 0 byte
bytes.readByte(); // Skip 0 byte
}
/**
* @return mnemonic for instruction with symbolic references resolved
*/
@Override
public String toString( final ConstantPool cp ) {
return super.toString(cp);
}
@Override
public Class<?>[] getExceptions() {
return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_INTERFACE_METHOD_RESOLUTION,
ExceptionConst.UNSATISFIED_LINK_ERROR,
ExceptionConst.ABSTRACT_METHOD_ERROR,
ExceptionConst.ILLEGAL_ACCESS_ERROR,
ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR);
}
/**
* Call corresponding visitor method(s). The order is:
* Call visitor methods of implemented interfaces first, then
* call methods according to the class hierarchy in descending order,
* i.e., the most specific visitXXX() call comes last.
*
* @param v Visitor object
*/
@Override
public void accept( final Visitor v ) {
v.visitExceptionThrower(this);
v.visitTypedInstruction(this);
v.visitStackConsumer(this);
v.visitStackProducer(this);
v.visitLoadClass(this);
v.visitCPInstruction(this);
v.visitFieldOrMethod(this);
v.visitInvokeInstruction(this);
v.visitINVOKEDYNAMIC(this);
}
/**
* Override the parent method because our classname is held elsewhere.
*/
@Override
public String getClassName( final ConstantPoolGen cpg ) {
final ConstantPool cp = cpg.getConstantPool();
final ConstantInvokeDynamic cid = (ConstantInvokeDynamic) cp.getConstant(super.getIndex(), Const.CONSTANT_InvokeDynamic);
return ((ConstantNameAndType) cp.getConstant(cid.getNameAndTypeIndex())).getName(cp);
}
/**
* Since InvokeDynamic doesn't refer to a reference type, just return java.lang.Object,
* as that is the only type we can say for sure the reference will be.
*
* @param cpg
* the ConstantPoolGen used to create the instruction
* @return an ObjectType for java.lang.Object
*/
@Override
public ReferenceType getReferenceType(final ConstantPoolGen cpg) {
return new ObjectType(Object.class.getName());
}
}
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