1/*
2 * Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include <wtf/FastBitVector.h>
29
30namespace JSC {
31
32class BytecodeLivenessAnalysis;
33
34typedef HashMap<BytecodeIndex, FastBitVector> BytecodeToBitmapMap;
35
36class FullBytecodeLiveness {
37 WTF_MAKE_FAST_ALLOCATED;
38public:
39 const FastBitVector& getLiveness(BytecodeIndex bytecodeIndex) const
40 {
41 // FIXME: What should this do when we have checkpoints?
42 return m_map[bytecodeIndex.offset()];
43 }
44
45 bool operandIsLive(int operand, BytecodeIndex bytecodeIndex) const
46 {
47 return operandIsAlwaysLive(operand) || operandThatIsNotAlwaysLiveIsLive(getLiveness(bytecodeIndex), operand);
48 }
49
50private:
51 friend class BytecodeLivenessAnalysis;
52
53 Vector<FastBitVector, 0, UnsafeVectorOverflow> m_map;
54};
55
56} // namespace JSC
57