/*

 * Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.

 */

/*

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

/**

 * LDC2_W - Push long or double from constant pool

 *

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

 *

 * @LastModified: May 2021

 */

public class LDC2_W extends CPInstruction implements PushInstruction {

    /**

     * Empty constructor needed for Instruction.readInstruction.

     * Not to be used otherwise.

     */

    LDC2_W() {

    }

    public LDC2_W(final int index) {

        super(com.sun.org.apache.bcel.internal.Const.LDC2_W, index);

    }

    @Override

    public Type getType( final ConstantPoolGen cpg ) {

        switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) {

            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Long:

                return Type.LONG;

            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Double:

                return Type.DOUBLE;

            default: // Never reached

                throw new IllegalArgumentException("Unknown constant type " + super.getOpcode());

        }

    }

    public Number getValue( final ConstantPoolGen cpg ) {

        final com.sun.org.apache.bcel.internal.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex());

        switch (c.getTag()) {

            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Long:

                return ((com.sun.org.apache.bcel.internal.classfile.ConstantLong) c).getBytes();

            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Double:

                return ((com.sun.org.apache.bcel.internal.classfile.ConstantDouble) c).getBytes();

            default: // Never reached

                throw new IllegalArgumentException("Unknown or invalid constant type at " + super.getIndex());

        }

    }

    /**

     * 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.visitStackProducer(this);

        v.visitPushInstruction(this);

        v.visitTypedInstruction(this);

        v.visitCPInstruction(this);

        v.visitLDC2_W(this);

    }

}