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150 lines
5.3 KiB
150 lines
5.3 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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package com.sun.org.apache.bcel.internal.generic;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import com.sun.org.apache.bcel.internal.Constants;
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import com.sun.org.apache.bcel.internal.classfile.*;
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import java.util.StringTokenizer;
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/**
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* Super class for the INVOKExxx family of instructions.
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*
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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*/
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public abstract class InvokeInstruction extends FieldOrMethod
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implements ExceptionThrower, TypedInstruction, StackConsumer, StackProducer {
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/**
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* Empty constructor needed for the Class.newInstance() statement in
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* Instruction.readInstruction(). Not to be used otherwise.
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*/
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InvokeInstruction() {}
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/**
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* @param index to constant pool
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*/
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protected InvokeInstruction(short opcode, int index) {
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super(opcode, index);
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}
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/**
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* @return mnemonic for instruction with symbolic references resolved
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*/
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public String toString(ConstantPool cp) {
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Constant c = cp.getConstant(index);
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StringTokenizer tok = new StringTokenizer(cp.constantToString(c));
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return Constants.OPCODE_NAMES[opcode] + " " +
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tok.nextToken().replace('.', '/') + tok.nextToken();
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}
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/**
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* Also works for instructions whose stack effect depends on the
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* constant pool entry they reference.
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* @return Number of words consumed from stack by this instruction
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*/
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public int consumeStack(ConstantPoolGen cpg) {
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String signature = getSignature(cpg);
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Type[] args = Type.getArgumentTypes(signature);
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int sum;
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if(opcode == Constants.INVOKESTATIC)
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sum = 0;
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else
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sum = 1; // this reference
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int n = args.length;
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for (int i = 0; i < n; i++)
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sum += args[i].getSize();
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return sum;
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}
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/**
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* Also works for instructions whose stack effect depends on the
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* constant pool entry they reference.
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* @return Number of words produced onto stack by this instruction
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*/
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public int produceStack(ConstantPoolGen cpg) {
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return getReturnType(cpg).getSize();
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}
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/** @return return type of referenced method.
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*/
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public Type getType(ConstantPoolGen cpg) {
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return getReturnType(cpg);
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}
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/** @return name of referenced method.
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*/
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public String getMethodName(ConstantPoolGen cpg) {
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return getName(cpg);
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}
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/** @return return type of referenced method.
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*/
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public Type getReturnType(ConstantPoolGen cpg) {
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return Type.getReturnType(getSignature(cpg));
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}
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/** @return argument types of referenced method.
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*/
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public Type[] getArgumentTypes(ConstantPoolGen cpg) {
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return Type.getArgumentTypes(getSignature(cpg));
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}
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}
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