/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
package com.sun.org.apache.bcel.internal.generic;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
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* distribution.
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* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
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* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
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* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
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* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
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import com.sun.org.apache.bcel.internal.classfile.ConstantPool;
import com.sun.org.apache.bcel.internal.Constants;
import com.sun.org.apache.bcel.internal.ExceptionConstants;
import java.io.*;
import com.sun.org.apache.bcel.internal.util.ByteSequence;
/**
* INVOKEINTERFACE - Invoke interface method
* <PRE>Stack: ..., objectref, [arg1, [arg2 ...]] -> ...</PRE>
*
* @version $Id: INVOKEINTERFACE.java,v 1.1.2.1 2005/07/31 23:45:03 jeffsuttor Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</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 the Class.newInstance() statement in
* Instruction.readInstruction(). Not to be used otherwise.
*/
INVOKEINTERFACE() {}
public INVOKEINTERFACE(int index, int nargs) {
super(Constants.INVOKEINTERFACE, index);
length = 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
*/
public void dump(DataOutputStream out) throws IOException {
out.writeByte(opcode);
out.writeShort(index);
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.
*/
protected void initFromFile(ByteSequence bytes, boolean wide)
throws IOException
{
super.initFromFile(bytes, wide);
length = 5;
nargs = bytes.readUnsignedByte();
bytes.readByte(); // Skip 0 byte
}
/**
* @return mnemonic for instruction with symbolic references resolved
*/
public String toString(ConstantPool cp) {
return super.toString(cp) + " " + nargs;
}
public int consumeStack(ConstantPoolGen cpg) { // nargs is given in byte-code
return nargs; // nargs includes this reference
}
public Class[] getExceptions() {
Class[] cs = new Class[4 + ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length];
System.arraycopy(ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION, 0,
cs, 0, ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length);
cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length+3] = ExceptionConstants.INCOMPATIBLE_CLASS_CHANGE_ERROR;
cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length+2] = ExceptionConstants.ILLEGAL_ACCESS_ERROR;
cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length+1] = ExceptionConstants.ABSTRACT_METHOD_ERROR;
cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length] = ExceptionConstants.UNSATISFIED_LINK_ERROR;
return cs;
}
/**
* 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
*/
public void accept(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);
}
}