src/java.xml/share/classes/com/sun/org/apache/bcel/internal/generic/LDC.java
author joehw
Fri, 01 Dec 2017 10:02:25 -0800
changeset 48041 2743e489189e
parent 47216 71c04702a3d5
child 55496 8e0ae3830fca
permissions -rw-r--r--
8191938: Fix lint warnings in JAXP repo: a few Deprecation warrnings and enable -Xlint:all Reviewed-by: darcy, rriggs
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/*
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 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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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.ExceptionConst;
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import com.sun.org.apache.bcel.internal.util.ByteSequence;
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/**
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 * LDC - Push item from constant pool.
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 *
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 * <PRE>Stack: ... -&gt; ..., item</PRE>
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 *
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 * @version $Id: LDC.java 1749603 2016-06-21 20:50:19Z ggregory $
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 * @LastModified: Nov 2017
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 */
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public class LDC extends CPInstruction implements PushInstruction, ExceptionThrower {
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    /**
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     * Empty constructor needed for the Class.newInstance() statement in
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     * Instruction.readInstruction(). Not to be used otherwise.
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     */
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    LDC() {
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    }
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    public LDC(final int index) {
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        super(com.sun.org.apache.bcel.internal.Const.LDC_W, index);
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        setSize();
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    }
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    // Adjust to proper size
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    protected final void setSize() {
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        if (super.getIndex() <= com.sun.org.apache.bcel.internal.Const.MAX_BYTE) { // Fits in one byte?
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            super.setOpcode(com.sun.org.apache.bcel.internal.Const.LDC);
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            super.setLength(2);
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        } else {
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            super.setOpcode(com.sun.org.apache.bcel.internal.Const.LDC_W);
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            super.setLength(3);
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        }
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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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        out.writeByte(super.getOpcode());
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        if (super.getLength() == 2) { // TODO useless check?
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            out.writeByte(super.getIndex());
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        } else {
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            out.writeShort(super.getIndex());
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        }
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    }
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    /**
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     * Set the index to constant pool and adjust size.
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     */
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    @Override
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    public final void setIndex( final int index ) {
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        super.setIndex(index);
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        setSize();
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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.setLength(2);
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        super.setIndex(bytes.readUnsignedByte());
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    }
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    public Object getValue( final ConstantPoolGen cpg ) {
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        com.sun.org.apache.bcel.internal.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex());
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        switch (c.getTag()) {
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            case com.sun.org.apache.bcel.internal.Const.CONSTANT_String:
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                final int i = ((com.sun.org.apache.bcel.internal.classfile.ConstantString) c).getStringIndex();
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                c = cpg.getConstantPool().getConstant(i);
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                return ((com.sun.org.apache.bcel.internal.classfile.ConstantUtf8) c).getBytes();
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            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Float:
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                return ((com.sun.org.apache.bcel.internal.classfile.ConstantFloat) c).getBytes();
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            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Integer:
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                return ((com.sun.org.apache.bcel.internal.classfile.ConstantInteger) c).getBytes();
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            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Class:
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                final int nameIndex = ((com.sun.org.apache.bcel.internal.classfile.ConstantClass) c).getNameIndex();
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                c = cpg.getConstantPool().getConstant(nameIndex);
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                return new ObjectType(((com.sun.org.apache.bcel.internal.classfile.ConstantUtf8) c).getBytes());
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            default: // Never reached
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                throw new RuntimeException("Unknown or invalid constant type at " + super.getIndex());
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        }
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    }
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    @Override
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    public Type getType( final ConstantPoolGen cpg ) {
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        switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) {
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            case com.sun.org.apache.bcel.internal.Const.CONSTANT_String:
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                return Type.STRING;
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            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Float:
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                return Type.FLOAT;
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            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Integer:
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                return Type.INT;
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            case com.sun.org.apache.bcel.internal.Const.CONSTANT_Class:
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                return Type.CLASS;
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            default: // Never reached
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                throw new RuntimeException("Unknown or invalid constant type at " + super.getIndex());
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        }
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    }
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    @Override
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    public Class<?>[] getExceptions() {
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        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_STRING_RESOLUTION);
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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.visitStackProducer(this);
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        v.visitPushInstruction(this);
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        v.visitExceptionThrower(this);
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        v.visitTypedInstruction(this);
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        v.visitCPInstruction(this);
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        v.visitLDC(this);
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    }
6
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}