src/java.xml/share/classes/com/sun/org/apache/bcel/internal/generic/TABLESWITCH.java
author joehw
Wed, 26 Jun 2019 05:49:59 +0000
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parent 47216 71c04702a3d5
permissions -rw-r--r--
8224157: BCEL: update to version 6.3.1 Reviewed-by: dfuchs, lancea
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/*
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 * reserved comment block
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 * DO NOT REMOVE OR ALTER!
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 */
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/*
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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements.  See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License.  You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.sun.org.apache.bcel.internal.generic;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import com.sun.org.apache.bcel.internal.util.ByteSequence;
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/**
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 * TABLESWITCH - Switch within given range of values, i.e., low..high
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 *
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 * @version $Id$
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 * @see SWITCH
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 */
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public class TABLESWITCH extends Select {
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    /**
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     * Empty constructor needed for Instruction.readInstruction.
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     * Not to be used otherwise.
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     */
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    TABLESWITCH() {
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    }
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    /**
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     * @param match sorted array of match values, match[0] must be low value,
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     * match[match_length - 1] high value
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     * @param targets where to branch for matched values
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     * @param defaultTarget default branch
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     */
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    public TABLESWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle defaultTarget) {
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        super(com.sun.org.apache.bcel.internal.Const.TABLESWITCH, match, targets, defaultTarget);
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        /* Alignment remainder assumed 0 here, until dump time */
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        final short _length = (short) (13 + getMatch_length() * 4);
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        super.setLength(_length);
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        setFixed_length(_length);
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    }
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    /**
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     * Dump instruction as byte code to stream out.
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     * @param out Output stream
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     */
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    @Override
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    public void dump( final DataOutputStream out ) throws IOException {
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        super.dump(out);
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        final int _match_length = getMatch_length();
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        final int low = (_match_length > 0) ? super.getMatch(0) : 0;
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        out.writeInt(low);
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        final int high = (_match_length > 0) ? super.getMatch(_match_length - 1) : 0;
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        out.writeInt(high);
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        for (int i = 0; i < _match_length; i++) {
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            out.writeInt(setIndices(i, getTargetOffset(super.getTarget(i))));
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        }
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    }
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    /**
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     * Read needed data (e.g. index) from file.
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     */
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    @Override
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    protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
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        super.initFromFile(bytes, wide);
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        final int low = bytes.readInt();
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        final int high = bytes.readInt();
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        final int _match_length = high - low + 1;
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        setMatch_length(_match_length);
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        final short _fixed_length = (short) (13 + _match_length * 4);
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        setFixed_length(_fixed_length);
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        super.setLength((short) (_fixed_length + super.getPadding()));
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        super.setMatches(new int[_match_length]);
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        super.setIndices(new int[_match_length]);
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        super.setTargets(new InstructionHandle[_match_length]);
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        for (int i = 0; i < _match_length; i++) {
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            super.setMatch(i, low + i);
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            super.setIndices(i, bytes.readInt());
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        }
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    }
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    /**
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     * Call corresponding visitor method(s). The order is:
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     * Call visitor methods of implemented interfaces first, then
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     * call methods according to the class hierarchy in descending order,
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     * i.e., the most specific visitXXX() call comes last.
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     *
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     * @param v Visitor object
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     */
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    @Override
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    public void accept( final Visitor v ) {
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        v.visitVariableLengthInstruction(this);
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        v.visitStackConsumer(this);
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        v.visitBranchInstruction(this);
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        v.visitSelect(this);
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        v.visitTABLESWITCH(this);
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    }
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}