Mercurial > hg > graal-compiler
view graal/com.oracle.graal.bytecode/src/com/oracle/graal/bytecode/BytecodeSwitch.java @ 16481:e7fc65330742
moved format(String format, JavaField field) from MetaUtil to be a default method in JavaField
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 10 Jul 2014 22:48:44 +0200 |
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; /** * An abstract class that provides the state and methods common to {@link Bytecodes#LOOKUPSWITCH} * and {@link Bytecodes#TABLESWITCH} instructions. */ public abstract class BytecodeSwitch { /** * The {@link BytecodeStream} containing the bytecode array. */ protected final BytecodeStream stream; /** * Index of start of switch instruction. */ protected final int bci; /** * Index of the start of the additional data for the switch instruction, aligned to a multiple * of four from the method start. */ protected final int alignedBci; /** * 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 BytecodeSwitch(BytecodeStream stream, int bci) { this.stream = stream; this.bci = bci; this.alignedBci = (bci + 4) & 0xfffffffc; } /** * Gets the current bytecode index. * * @return the current bytecode index */ public int bci() { return bci; } /** * Gets the index of the instruction denoted by the {@code i}'th switch target. * * @param i index of the switch target * @return the index of the instruction denoted by the {@code i}'th switch target */ public int targetAt(int i) { return bci + offsetAt(i); } /** * Gets the index of the instruction for the default switch target. * * @return the index of the instruction for the default switch target */ public int defaultTarget() { return bci + defaultOffset(); } /** * Gets the offset from the start of the switch instruction to the default switch target. * * @return the offset to the default switch target */ public int defaultOffset() { return stream.readInt(alignedBci); } /** * Gets the key at {@code i}'th switch target index. * * @param i the switch target index * @return the key at {@code i}'th switch target index */ public abstract int keyAt(int i); /** * Gets the offset from the start of the switch instruction for the {@code i}'th switch target. * * @param i the switch target index * @return the offset to the {@code i}'th switch target */ public abstract int offsetAt(int i); /** * Gets the number of switch targets. * * @return the number of switch targets */ public abstract int numberOfCases(); /** * Gets the total size in bytes of the switch instruction. * * @return the total size in bytes of the switch instruction */ public abstract int size(); }