1/*
2 * Copyright (C) 2016 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 "LazyProperty.h"
29#include "Structure.h"
30
31namespace JSC {
32
33class JSGlobalObject;
34class VM;
35
36class LazyClassStructure {
37 typedef LazyProperty<JSGlobalObject, Structure>::Initializer StructureInitializer;
38
39public:
40 struct Initializer {
41 Initializer(VM&, JSGlobalObject*, LazyClassStructure&, const StructureInitializer&);
42
43 // This should be called first or not at all.
44 void setPrototype(JSObject* prototype);
45
46 // If this is called after setPrototype() then it just sets the structure. If this is
47 // called first then it sets the prototype by extracting it from the structure.
48 void setStructure(Structure*);
49
50 // Call this last. It's expected that the constructor is initialized to point to the
51 // prototype already. This will automatically set prototype.constructor=constructor.
52 void setConstructor(JSObject* constructor);
53
54 VM& vm;
55 JSGlobalObject* global;
56 LazyClassStructure& classStructure;
57 const StructureInitializer& structureInit;
58
59 // It's expected that you set these using the set methods above.
60 JSObject* prototype { nullptr };
61 Structure* structure { nullptr };
62 JSObject* constructor { nullptr };
63 };
64
65 LazyClassStructure()
66 {
67 }
68
69 template<typename Callback>
70 void initLater(const Callback&);
71
72 Structure* get(const JSGlobalObject* global) const
73 {
74 ASSERT(!isCompilationThread());
75 return m_structure.get(global);
76 }
77
78 JSObject* prototype(const JSGlobalObject* global) const
79 {
80 ASSERT(!isCompilationThread());
81 return get(global)->storedPrototypeObject();
82 }
83
84 // Almost as an afterthought, we also support getting the original constructor. This turns
85 // out to be important for ES6 support.
86 JSObject* constructor(const JSGlobalObject* global) const
87 {
88 ASSERT(!isCompilationThread());
89 m_structure.get(global);
90 return m_constructor.get();
91 }
92
93 Structure* getConcurrently() const
94 {
95 return m_structure.getConcurrently();
96 }
97
98 JSObject* constructorConcurrently() const
99 {
100 return m_constructor.get();
101 }
102
103 // Call this "InitializedOnMainThread" function if we would like to (1) get a value from a compiler thread which must be initialized on the main thread and (2) initialize a value if we are on the main thread.
104 Structure* getInitializedOnMainThread(const JSGlobalObject* global) const
105 {
106 return m_structure.getInitializedOnMainThread(global);
107 }
108
109 JSObject* prototypeInitializedOnMainThread(const JSGlobalObject* global) const
110 {
111 return getInitializedOnMainThread(global)->storedPrototypeObject();
112 }
113
114 JSObject* constructorInitializedOnMainThread(const JSGlobalObject* global) const
115 {
116 m_structure.getInitializedOnMainThread(global);
117 return m_constructor.get();
118 }
119
120 void visit(SlotVisitor&);
121
122 void dump(PrintStream&) const;
123
124private:
125 LazyProperty<JSGlobalObject, Structure> m_structure;
126 WriteBarrier<JSObject> m_constructor;
127};
128
129} // namespace JSC
130