Mercurial > hg > truffle
view graal/com.oracle.max.cri/src/com/sun/cri/bytecode/BytecodeTableSwitch.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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/* * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.cri.bytecode; /** * A utility for processing {@link Bytecodes#TABLESWITCH} bytecodes. */ public class BytecodeTableSwitch extends BytecodeSwitch { private static final int OFFSET_TO_LOW_KEY = 4; private static final int OFFSET_TO_HIGH_KEY = 8; private static final int OFFSET_TO_FIRST_JUMP_OFFSET = 12; private static final int JUMP_OFFSET_SIZE = 4; /** * 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 BytecodeTableSwitch(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 BytecodeTableSwitch(byte[] code, int bci) { super(code, bci); } /** * Gets the low key of the table switch. * @return the low key */ public int lowKey() { return readWord(alignedBci + OFFSET_TO_LOW_KEY); } /** * Gets the high key of the table switch. * @return the high key */ public int highKey() { return readWord(alignedBci + OFFSET_TO_HIGH_KEY); } @Override public int keyAt(int i) { return lowKey() + i; } @Override public int defaultOffset() { return readWord(alignedBci); } @Override public int offsetAt(int i) { return readWord(alignedBci + OFFSET_TO_FIRST_JUMP_OFFSET + JUMP_OFFSET_SIZE * i); } @Override public int numberOfCases() { return highKey() - lowKey() + 1; } @Override public int size() { return alignedBci + OFFSET_TO_FIRST_JUMP_OFFSET + JUMP_OFFSET_SIZE * numberOfCases() - bci; } }