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