| /* |
| * 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 org.graalvm.compiler.bytecode; |
| |
| /** |
| * A utility for processing {@link Bytecodes#LOOKUPSWITCH} bytecodes. |
| */ |
| 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); |
| } |
| |
| @Override |
| public int offsetAt(int i) { |
| return stream.readInt(alignedBci + OFFSET_TO_FIRST_PAIR_OFFSET + PAIR_SIZE * i); |
| } |
| |
| @Override |
| public int keyAt(int i) { |
| return stream.readInt(alignedBci + OFFSET_TO_FIRST_PAIR_MATCH + PAIR_SIZE * i); |
| } |
| |
| @Override |
| public int numberOfCases() { |
| return stream.readInt(alignedBci + OFFSET_TO_NUMBER_PAIRS); |
| } |
| |
| @Override |
| public int size() { |
| return alignedBci + OFFSET_TO_FIRST_PAIR_MATCH + PAIR_SIZE * numberOfCases() - bci; |
| } |
| } |