Mercurial > hg > truffle
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.cri/src/com/sun/cri/bytecode/BytecodeTableSwitch.java Sat Dec 17 19:59:18 2011 +0100 @@ -0,0 +1,92 @@ +/* + * 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; + } +}