/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * 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.

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package com.sun.org.apache.bcel.internal.generic;

import com.sun.org.apache.bcel.internal.Const;

import com.sun.org.apache.bcel.internal.ExceptionConst;

/**

 * GETFIELD - Fetch field from object

 * <PRE>Stack: ..., objectref -&gt; ..., value</PRE> OR

 * <PRE>Stack: ..., objectref -&gt; ..., value.word1, value.word2</PRE>

 *

 * @version $Id: GETFIELD.java 1747278 2016-06-07 17:28:43Z britter $

 */

public class GETFIELD extends FieldInstruction implements ExceptionThrower, StackConsumer,

        StackProducer {

    /**

     * Empty constructor needed for the Class.newInstance() statement in

     * Instruction.readInstruction(). Not to be used otherwise.

     */

    GETFIELD() {

    }

    public GETFIELD(final int index) {

        super(Const.GETFIELD, index);

    }

    @Override

    public int produceStack(final ConstantPoolGen cpg) {

        return getFieldSize(cpg);

    }

    @Override

    public Class<?>[] getExceptions() {

        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_FIELD_AND_METHOD_RESOLUTION,

                ExceptionConst.NULL_POINTER_EXCEPTION,

                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.visitStackConsumer(this);

        v.visitStackProducer(this);

        v.visitTypedInstruction(this);

        v.visitLoadClass(this);

        v.visitCPInstruction(this);

        v.visitFieldOrMethod(this);

        v.visitFieldInstruction(this);

        v.visitGETFIELD(this);

    }

}