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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.ConstantPool;
import org.apache.bcel.util.ByteSequence;
/**
* INVOKEINTERFACE - Invoke interface method
* <PRE>Stack: ..., objectref, [arg1, [arg2 ...]] -> ...</PRE>
*
* @version $Id$
* @see
* <a href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-6.html#jvms-6.5.invokeinterface">
* The invokeinterface instruction in The Java Virtual Machine Specification</a>
*/
public final class INVOKEINTERFACE extends InvokeInstruction {
private int nargs; // Number of arguments on stack (number of stack slots), called "count" in vmspec2
/**
* Empty constructor needed for Instruction.readInstruction.
* Not to be used otherwise.
*/
INVOKEINTERFACE() {
}
public INVOKEINTERFACE(final int index, final int nargs) {
super(Const.INVOKEINTERFACE, index);
super.setLength(5);
if (nargs < 1) {
throw new ClassGenException("Number of arguments must be > 0 " + nargs);
}
this.nargs = nargs;
}
/**
* 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(nargs);
out.writeByte(0);
}
/**
* The <B>count</B> argument according to the Java Language Specification,
* Second Edition.
*/
public int getCount() {
return nargs;
}
/**
* 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);
nargs = bytes.readUnsignedByte();
bytes.readByte(); // Skip 0 byte
}
/**
* @return mnemonic for instruction with symbolic references resolved
*/
@Override
public String toString( final ConstantPool cp ) {
return super.toString(cp) + " " + nargs;
}
@Override
public int consumeStack( final ConstantPoolGen cpg ) { // nargs is given in byte-code
return nargs; // nargs includes this reference
}
@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.visitINVOKEINTERFACE(this);
}
}
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