1/*
2 * Copyright (C) 2013 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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef StaticPropertyAnalysis_h
27#define StaticPropertyAnalysis_h
28
29#include "Executable.h"
30#include "JSGlobalObject.h"
31#include <wtf/HashSet.h>
32
33namespace JSC {
34
35// Reference count indicates number of live registers that alias this object.
36class StaticPropertyAnalysis : public RefCounted<StaticPropertyAnalysis> {
37public:
38    static PassRefPtr<StaticPropertyAnalysis> create(Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>* instructions, unsigned target)
39    {
40        return adoptRef(new StaticPropertyAnalysis(instructions, target));
41    }
42
43    void addPropertyIndex(unsigned propertyIndex) { m_propertyIndexes.add(propertyIndex); }
44
45    void record()
46    {
47        (*m_instructions)[m_target] = m_propertyIndexes.size();
48    }
49
50    int propertyIndexCount() { return m_propertyIndexes.size(); }
51
52private:
53    StaticPropertyAnalysis(Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>* instructions, unsigned target)
54        : m_instructions(instructions)
55        , m_target(target)
56    {
57    }
58
59    Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>* m_instructions;
60    unsigned m_target;
61    typedef HashSet<unsigned, WTF::IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned>> PropertyIndexSet;
62    PropertyIndexSet m_propertyIndexes;
63};
64
65} // namespace JSC
66
67#endif // StaticPropertyAnalysis_h
68