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      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/v8/CustomElementBinding.h"
     35 #include "bindings/v8/ScopedPersistent.h"
     36 #include "bindings/v8/UnsafePersistent.h"
     37 #include "bindings/v8/V8DOMActivityLogger.h"
     38 #include "bindings/v8/WrapperTypeInfo.h"
     39 #include <v8.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 
     46 namespace WebCore {
     47 
     48 class CustomElementDefinition;
     49 struct V8NPObject;
     50 typedef WTF::Vector<V8NPObject*> V8NPObjectVector;
     51 typedef WTF::HashMap<int, V8NPObjectVector> V8NPObjectMap;
     52 
     53 enum V8ContextEmbedderDataField {
     54     v8ContextDebugIdIndex,
     55     v8ContextPerContextDataIndex,
     56     v8ContextIsolatedWorld,
     57     // Rather than adding more embedder data fields to v8::Context,
     58     // consider adding the data to V8PerContextData instead.
     59 };
     60 
     61 class V8PerContextData {
     62 public:
     63     static PassOwnPtr<V8PerContextData> create(v8::Handle<v8::Context> context)
     64     {
     65         return adoptPtr(new V8PerContextData(context));
     66     }
     67 
     68     ~V8PerContextData()
     69     {
     70         dispose();
     71     }
     72 
     73     bool init();
     74 
     75     static V8PerContextData* from(v8::Handle<v8::Context> context)
     76     {
     77         return static_cast<V8PerContextData*>(context->GetAlignedPointerFromEmbedderData(v8ContextPerContextDataIndex));
     78     }
     79 
     80     // To create JS Wrapper objects, we create a cache of a 'boiler plate'
     81     // object, and then simply Clone that object each time we need a new one.
     82     // This is faster than going through the full object creation process.
     83     v8::Local<v8::Object> createWrapperFromCache(WrapperTypeInfo* type)
     84     {
     85         UnsafePersistent<v8::Object> boilerplate = m_wrapperBoilerplates.get(type);
     86         return !boilerplate.isEmpty() ? boilerplate.newLocal(v8::Isolate::GetCurrent())->Clone() : createWrapperFromCacheSlowCase(type);
     87     }
     88 
     89     v8::Local<v8::Function> constructorForType(WrapperTypeInfo* type)
     90     {
     91         UnsafePersistent<v8::Function> function = m_constructorMap.get(type);
     92         if (!function.isEmpty())
     93             return function.newLocal(v8::Isolate::GetCurrent());
     94         return constructorForTypeSlowCase(type);
     95     }
     96 
     97     V8NPObjectMap* v8NPObjectMap()
     98     {
     99         return &m_v8NPObjectMap;
    100     }
    101 
    102     V8DOMActivityLogger* activityLogger()
    103     {
    104         return m_activityLogger;
    105     }
    106 
    107     void setActivityLogger(V8DOMActivityLogger* logger)
    108     {
    109         m_activityLogger = logger;
    110     }
    111 
    112     void addCustomElementBinding(CustomElementDefinition*, PassOwnPtr<CustomElementBinding>);
    113     void clearCustomElementBinding(CustomElementDefinition*);
    114     CustomElementBinding* customElementBinding(CustomElementDefinition*);
    115 
    116 private:
    117     explicit V8PerContextData(v8::Handle<v8::Context> context)
    118         : m_activityLogger(0)
    119         , m_isolate(v8::Isolate::GetCurrent())
    120         , m_context(m_isolate, context)
    121         , m_customElementBindings(adoptPtr(new CustomElementBindingMap()))
    122     {
    123     }
    124 
    125     void dispose();
    126 
    127     v8::Local<v8::Object> createWrapperFromCacheSlowCase(WrapperTypeInfo*);
    128     v8::Local<v8::Function> constructorForTypeSlowCase(WrapperTypeInfo*);
    129 
    130     // For each possible type of wrapper, we keep a boilerplate object.
    131     // The boilerplate is used to create additional wrappers of the same type.
    132     typedef WTF::HashMap<WrapperTypeInfo*, UnsafePersistent<v8::Object> > WrapperBoilerplateMap;
    133     WrapperBoilerplateMap m_wrapperBoilerplates;
    134 
    135     typedef WTF::HashMap<WrapperTypeInfo*, UnsafePersistent<v8::Function> > ConstructorMap;
    136     ConstructorMap m_constructorMap;
    137 
    138     V8NPObjectMap m_v8NPObjectMap;
    139     // We cache a pointer to the V8DOMActivityLogger associated with the world
    140     // corresponding to this context. The ownership of the pointer is retained
    141     // by the DOMActivityLoggerMap in DOMWrapperWorld.
    142     V8DOMActivityLogger* m_activityLogger;
    143     v8::Isolate* m_isolate;
    144     v8::Persistent<v8::Context> m_context;
    145     ScopedPersistent<v8::Value> m_errorPrototype;
    146 
    147     typedef WTF::HashMap<CustomElementDefinition*, OwnPtr<CustomElementBinding> > CustomElementBindingMap;
    148     OwnPtr<CustomElementBindingMap> m_customElementBindings;
    149 };
    150 
    151 class V8PerContextDebugData {
    152 public:
    153     static bool setContextDebugData(v8::Handle<v8::Context>, const char* worldName, int debugId);
    154     static int contextDebugId(v8::Handle<v8::Context>);
    155 };
    156 
    157 } // namespace WebCore
    158 
    159 #endif // V8PerContextData_h
    160