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76 lines (68 loc) · 2.72 KB
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/*
* Copyright (c) 2009 Sun Microsystems, Inc. All rights reserved.
*
* Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation, these intellectual property
* rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
* more additional patents or pending patent applications in the U.S. and in other countries.
*
* U.S. Government Rights - Commercial software. Government users are subject to the Sun
* Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
* supplements.
*
* Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
* registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
* are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
* U.S. and other countries.
*
* UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
* Company, Ltd.
*/
package com.sun.cri.bytecode;
/**
* A utility for processing {@link Bytecodes#LOOKUPSWITCH} bytecodes.
*
* @author Ben L. Titzer
*/
public class BytecodeLookupSwitch extends BytecodeSwitch {
private static final int OFFSET_TO_NUMBER_PAIRS = 4;
private static final int OFFSET_TO_FIRST_PAIR_MATCH = 8;
private static final int OFFSET_TO_FIRST_PAIR_OFFSET = 12;
private static final int PAIR_SIZE = 8;
/**
* Constructor for a {@link BytecodeStream}.
* @param stream the {@code BytecodeStream} containing the switch instruction
* @param bci the index in the stream of the switch instruction
*/
public BytecodeLookupSwitch(BytecodeStream stream, int bci) {
super(stream, bci);
}
/**
* Constructor for a bytecode array.
* @param code the bytecode array containing the switch instruction.
* @param bci the index in the array of the switch instruction
*/
public BytecodeLookupSwitch(byte[] code, int bci) {
super(code, bci);
}
@Override
public int defaultOffset() {
return readWord(alignedBci);
}
@Override
public int offsetAt(int i) {
return readWord(alignedBci + OFFSET_TO_FIRST_PAIR_OFFSET + PAIR_SIZE * i);
}
@Override
public int keyAt(int i) {
return readWord(alignedBci + OFFSET_TO_FIRST_PAIR_MATCH + PAIR_SIZE * i);
}
@Override
public int numberOfCases() {
return readWord(alignedBci + OFFSET_TO_NUMBER_PAIRS);
}
@Override
public int size() {
return alignedBci + OFFSET_TO_FIRST_PAIR_MATCH + PAIR_SIZE * numberOfCases() - bci;
}
}