Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.bytecode/src/com/oracle/graal/bytecode/BytecodeTableSwitch.java @ 14123:dc41eab09fe8
gate: add non-tiered bootstrap
author | Bernhard Urban <bernhard.urban@jku.at> |
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date | Mon, 10 Mar 2014 16:20:45 +0100 |
parents | 5e3d1a68664e |
children | 1cde96b96673 |
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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.oracle.graal.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); } /** * Gets the low key of the table switch. * * @return the low key */ public int lowKey() { return stream.readInt(alignedBci + OFFSET_TO_LOW_KEY); } /** * Gets the high key of the table switch. * * @return the high key */ public int highKey() { return stream.readInt(alignedBci + OFFSET_TO_HIGH_KEY); } @Override public int keyAt(int i) { return lowKey() + i; } @Override public int offsetAt(int i) { return stream.readInt(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; } }