1 | // -*- mode: c++; c-basic-offset: 4 -*- |
2 | /* |
3 | * Copyright (C) 2008 Apple Inc. All rights reserved. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * |
14 | * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
15 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
17 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
18 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
19 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
20 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
21 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
22 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
24 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
25 | */ |
26 | |
27 | #ifndef JSTypeInfo_h |
28 | #define JSTypeInfo_h |
29 | |
30 | // This file would be called TypeInfo.h, but that conflicts with <typeinfo.h> |
31 | // in the STL on systems without case-sensitive file systems. |
32 | |
33 | #include "JSType.h" |
34 | |
35 | namespace JSC { |
36 | |
37 | // WebCore uses MasqueradesAsUndefined to make document.all and style.filter undetectable. |
38 | static const unsigned MasqueradesAsUndefined = 1; |
39 | static const unsigned ImplementsHasInstance = 1 << 1; |
40 | static const unsigned OverridesHasInstance = 1 << 2; |
41 | static const unsigned ImplementsDefaultHasInstance = 1 << 3; |
42 | static const unsigned NeedsThisConversion = 1 << 4; |
43 | static const unsigned OverridesGetOwnPropertySlot = 1 << 5; |
44 | static const unsigned OverridesMarkChildren = 1 << 6; |
45 | static const unsigned OverridesGetPropertyNames = 1 << 7; |
46 | |
47 | class TypeInfo { |
48 | friend class JIT; |
49 | public: |
50 | TypeInfo(JSType type, unsigned flags = 0) |
51 | : m_type(type) |
52 | { |
53 | // ImplementsDefaultHasInstance means (ImplementsHasInstance & !OverridesHasInstance) |
54 | if ((flags & (ImplementsHasInstance | OverridesHasInstance)) == ImplementsHasInstance) |
55 | m_flags = flags | ImplementsDefaultHasInstance; |
56 | else |
57 | m_flags = flags; |
58 | } |
59 | |
60 | JSType type() const { return m_type; } |
61 | |
62 | bool masqueradesAsUndefined() const { return m_flags & MasqueradesAsUndefined; } |
63 | bool implementsHasInstance() const { return m_flags & ImplementsHasInstance; } |
64 | bool overridesHasInstance() const { return m_flags & OverridesHasInstance; } |
65 | bool needsThisConversion() const { return m_flags & NeedsThisConversion; } |
66 | bool overridesGetOwnPropertySlot() const { return m_flags & OverridesGetOwnPropertySlot; } |
67 | bool overridesMarkChildren() const { return m_flags & OverridesMarkChildren; } |
68 | bool overridesGetPropertyNames() const { return m_flags & OverridesGetPropertyNames; } |
69 | unsigned flags() const { return m_flags; } |
70 | |
71 | private: |
72 | JSType m_type; |
73 | unsigned m_flags; |
74 | }; |
75 | |
76 | } |
77 | |
78 | #endif // JSTypeInfo_h |
79 | |