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
35namespace 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

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSTypeInfo.h