Mercurial > hg > truffle
diff graal/com.oracle.jvmci.bytecode/src/com/oracle/jvmci/bytecode/BytecodeLookupSwitch.java @ 21713:454a99ca00a9
fixed canonicalizeprojects issues
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Wed, 03 Jun 2015 22:13:10 +0200 |
parents | graal/com.oracle.jvmci.bytecode/src/com/oracle/graal/bytecode/BytecodeLookupSwitch.java@1c41d00e6b2f |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.jvmci.bytecode/src/com/oracle/jvmci/bytecode/BytecodeLookupSwitch.java Wed Jun 03 22:13:10 2015 +0200 @@ -0,0 +1,64 @@ +/* + * 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.jvmci.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; + } +}