1/*
2 * Copyright (C) 2012 Google 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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef V8PerContextData_h
32#define V8PerContextData_h
33
34#include "bindings/core/v8/CustomElementBinding.h"
35#include "bindings/core/v8/ScopedPersistent.h"
36#include "bindings/core/v8/V8PersistentValueMap.h"
37#include "bindings/core/v8/WrapperTypeInfo.h"
38#include "gin/public/context_holder.h"
39#include "gin/public/gin_embedders.h"
40#include "wtf/HashMap.h"
41#include "wtf/PassOwnPtr.h"
42#include "wtf/Vector.h"
43#include "wtf/text/AtomicString.h"
44#include "wtf/text/AtomicStringHash.h"
45#include <v8.h>
46
47namespace blink {
48
49class CustomElementDefinition;
50class V8DOMActivityLogger;
51class V8PerContextData;
52struct V8NPObject;
53typedef WTF::Vector<V8NPObject*> V8NPObjectVector;
54typedef WTF::HashMap<int, V8NPObjectVector> V8NPObjectMap;
55
56enum V8ContextEmbedderDataField {
57    v8ContextDebugIdIndex = static_cast<int>(gin::kDebugIdIndex),
58    v8ContextPerContextDataIndex = static_cast<int>(gin::kPerContextDataStartIndex + gin::kEmbedderBlink),
59};
60
61class V8PerContextData {
62public:
63    static PassOwnPtr<V8PerContextData> create(v8::Handle<v8::Context>);
64
65    static V8PerContextData* from(v8::Handle<v8::Context>);
66
67    ~V8PerContextData();
68
69    v8::Handle<v8::Context> context() { return m_context.newLocal(m_isolate); }
70
71    // To create JS Wrapper objects, we create a cache of a 'boiler plate'
72    // object, and then simply Clone that object each time we need a new one.
73    // This is faster than going through the full object creation process.
74    v8::Local<v8::Object> createWrapperFromCache(const WrapperTypeInfo* type)
75    {
76        v8::Local<v8::Object> boilerplate = m_wrapperBoilerplates.Get(type);
77        return !boilerplate.IsEmpty() ? boilerplate->Clone() : createWrapperFromCacheSlowCase(type);
78    }
79
80    v8::Local<v8::Function> constructorForType(const WrapperTypeInfo* type)
81    {
82        v8::Local<v8::Function> function = m_constructorMap.Get(type);
83        return (!function.IsEmpty()) ? function : constructorForTypeSlowCase(type);
84    }
85
86    v8::Local<v8::Object> prototypeForType(const WrapperTypeInfo*);
87
88    V8NPObjectMap* v8NPObjectMap() { return &m_v8NPObjectMap; }
89
90    void addCustomElementBinding(CustomElementDefinition*, PassOwnPtr<CustomElementBinding>);
91    void clearCustomElementBinding(CustomElementDefinition*);
92    CustomElementBinding* customElementBinding(CustomElementDefinition*);
93
94    V8DOMActivityLogger* activityLogger() const { return m_activityLogger; }
95    void setActivityLogger(V8DOMActivityLogger* activityLogger) { m_activityLogger = activityLogger; }
96
97    v8::Handle<v8::Value> compiledPrivateScript(String);
98    void setCompiledPrivateScript(String, v8::Handle<v8::Value>);
99
100private:
101    V8PerContextData(v8::Handle<v8::Context>);
102
103    v8::Local<v8::Object> createWrapperFromCacheSlowCase(const WrapperTypeInfo*);
104    v8::Local<v8::Function> constructorForTypeSlowCase(const WrapperTypeInfo*);
105
106    v8::Isolate* m_isolate;
107
108    // For each possible type of wrapper, we keep a boilerplate object.
109    // The boilerplate is used to create additional wrappers of the same type.
110    typedef V8PersistentValueMap<const WrapperTypeInfo*, v8::Object, false> WrapperBoilerplateMap;
111    WrapperBoilerplateMap m_wrapperBoilerplates;
112
113    typedef V8PersistentValueMap<const WrapperTypeInfo*, v8::Function, false> ConstructorMap;
114    ConstructorMap m_constructorMap;
115
116    V8NPObjectMap m_v8NPObjectMap;
117
118    OwnPtr<gin::ContextHolder> m_contextHolder;
119
120    ScopedPersistent<v8::Context> m_context;
121    ScopedPersistent<v8::Value> m_errorPrototype;
122
123    typedef WTF::HashMap<CustomElementDefinition*, OwnPtr<CustomElementBinding> > CustomElementBindingMap;
124    OwnPtr<CustomElementBindingMap> m_customElementBindings;
125
126    // This is owned by a static hash map in V8DOMActivityLogger.
127    V8DOMActivityLogger* m_activityLogger;
128
129    V8PersistentValueMap<String, v8::Value, false> m_compiledPrivateScript;
130};
131
132class V8PerContextDebugData {
133public:
134    static bool setContextDebugData(v8::Handle<v8::Context>, const char* worldName, int debugId);
135    static int contextDebugId(v8::Handle<v8::Context>);
136};
137
138} // namespace blink
139
140#endif // V8PerContextData_h
141