    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 *
    017 */
    018package org.apache.bcel.generic;
    019
    020import org.apache.bcel.Const;
    021import org.apache.bcel.ExceptionConst;
    022
    023/**
    024 * GETSTATIC - Fetch static field from class
    025 * <PRE>Stack: ..., -&gt; ..., value</PRE>
    026 * OR
    027 * <PRE>Stack: ..., -&gt; ..., value.word1, value.word2</PRE>
    028 *
    029 */
    030public class GETSTATIC extends FieldInstruction implements PushInstruction, ExceptionThrower {
    031
    032    /**
    033     * Empty constructor needed for Instruction.readInstruction.
    034     * Not to be used otherwise.
    035     */
    036    GETSTATIC() {
    037    }
    038
    039
    040    public GETSTATIC(final int index) {
    041        super(Const.GETSTATIC, index);
    042    }
    043
    044
    045    @Override
    046    public int produceStack( final ConstantPoolGen cpg ) {
    047        return getFieldSize(cpg);
    048    }
    049
    050
    051    @Override
    052    public Class<?>[] getExceptions() {
    053        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_FIELD_AND_METHOD_RESOLUTION,
    054            ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR);
    055    }
    056
    057
    058    /**
    059     * Call corresponding visitor method(s). The order is:
    060     * Call visitor methods of implemented interfaces first, then
    061     * call methods according to the class hierarchy in descending order,
    062     * i.e., the most specific visitXXX() call comes last.
    063     *
    064     * @param v Visitor object
    065     */
    066    @Override
    067    public void accept( final Visitor v ) {
    068        v.visitStackProducer(this);
    069        v.visitPushInstruction(this);
    070        v.visitExceptionThrower(this);
    071        v.visitTypedInstruction(this);
    072        v.visitLoadClass(this);
    073        v.visitCPInstruction(this);
    074        v.visitFieldOrMethod(this);
    075        v.visitFieldInstruction(this);
    076        v.visitGETSTATIC(this);
    077    }
    078}