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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.util.StringTokenizer;
import org.apache.bcel.Const;
import org.apache.bcel.classfile.Constant;
import org.apache.bcel.classfile.ConstantCP;
import org.apache.bcel.classfile.ConstantPool;
/**
* Super class for the INVOKExxx family of instructions.
*
* @version $Id$
*/
public abstract class InvokeInstruction extends FieldOrMethod implements ExceptionThrower,
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(final short opcode, final int index) {
super(opcode, index);
}
/**
* @return mnemonic for instruction with symbolic references resolved
*/
@Override
public String toString( final ConstantPool cp ) {
final Constant c = cp.getConstant(super.getIndex());
final StringTokenizer tok = new StringTokenizer(cp.constantToString(c));
return Const.getOpcodeName(super.getOpcode()) + " " + 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
*/
@Override
public int consumeStack( final ConstantPoolGen cpg ) {
int sum;
if ((super.getOpcode() == Const.INVOKESTATIC) || (super.getOpcode() == Const.INVOKEDYNAMIC)) {
sum = 0;
} else {
sum = 1; // this reference
}
final String signature = getSignature(cpg);
sum += Type.getArgumentTypesSize(signature);
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
*/
@Override
public int produceStack( final ConstantPoolGen cpg ) {
final String signature = getSignature(cpg);
return Type.getReturnTypeSize(signature);
}
/**
* This overrides the deprecated version as we know here that the referenced class
* may legally be an array.
*
* @return name of the referenced class/interface
* @throws IllegalArgumentException if the referenced class is an array (this should not happen)
*/
@Override
public String getClassName( final ConstantPoolGen cpg ) {
final ConstantPool cp = cpg.getConstantPool();
final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
final String className = cp.getConstantString(cmr.getClassIndex(), Const.CONSTANT_Class);
return className.replace('/', '.');
}
/** @return return type of referenced method.
*/
@Override
public Type getType( final ConstantPoolGen cpg ) {
return getReturnType(cpg);
}
/** @return name of referenced method.
*/
public String getMethodName( final ConstantPoolGen cpg ) {
return getName(cpg);
}
/** @return return type of referenced method.
*/
public Type getReturnType( final ConstantPoolGen cpg ) {
return Type.getReturnType(getSignature(cpg));
}
/** @return argument types of referenced method.
*/
public Type[] getArgumentTypes( final ConstantPoolGen cpg ) {
return Type.getArgumentTypes(getSignature(cpg));
}
}
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