package org.aspectj.apache.bcel.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
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
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* distribution.
*
* 3. The end-user documentation included with the redistribution,
* 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.
*
* 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.
*
* 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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*
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* 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
* <http://www.apache.org/>.
*/
import java.util.StringTokenizer;
import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.classfile.Constant;
import org.aspectj.apache.bcel.classfile.ConstantPool;
/**
* Super class for the INVOKExxx family of instructions.
*
* @version $Id: InvokeInstruction.java,v 1.3 2004/11/22 08:31:27 aclement Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
public abstract class InvokeInstruction extends FieldOrMethod
implements ExceptionThrower, TypedInstruction, StackConsumer, StackProducer {
/**
* Empty constructor needed for the Class.newInstance() statement in
* Instruction.readInstruction(). Not to be used otherwise.
*/
InvokeInstruction() {}
/**
* @param index to constant pool
*/
protected InvokeInstruction(short opcode, int index) {
super(opcode, index);
}
/**
* @return mnemonic for instruction with symbolic references resolved
*/
public String toString(ConstantPool cp) {
Constant c = cp.getConstant(index);
StringTokenizer tok = new StringTokenizer(cp.constantToString(c));
return Constants.OPCODE_NAMES[opcode] + " " +
tok.nextToken().replace('.', '/') + tok.nextToken();
}
/**
* Also works for instructions whose stack effect depends on the
* constant pool entry they reference.
* @return Number of words consumed from stack by this instruction
*/
public int consumeStack(ConstantPoolGen cpg) {
String signature = getSignature(cpg);
Type[] args = Type.getArgumentTypes(signature);
int sum;
if(opcode == Constants.INVOKESTATIC)
sum = 0;
else
sum = 1; // this reference
int n = args.length;
for (int i = 0; i < n; i++)
sum += args[i].getSize();
return sum;
}
/**
* Also works for instructions whose stack effect depends on the
* constant pool entry they reference.
* @return Number of words produced onto stack by this instruction
*/
public int produceStack(ConstantPoolGen cpg) {
return getReturnType(cpg).getSize();
}
/** @return return type of referenced method.
*/
public Type getType(ConstantPoolGen cpg) {
return getReturnType(cpg);
}
/** @return name of referenced method.
*/
public String getMethodName(ConstantPoolGen cpg) {
return getName(cpg);
}
/** @return return type of referenced method.
*/
public Type getReturnType(ConstantPoolGen cpg) {
return Type.getReturnType(getSignature(cpg));
}
/** @return argument types of referenced method.
*/
public Type[] getArgumentTypes(ConstantPoolGen cpg) {
return Type.getArgumentTypes(getSignature(cpg));
}
}