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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef V8PerContextData_h
#define V8PerContextData_h
#include "ScopedPersistent.h"
#include "WrapperTypeInfo.h"
#include <v8.h>
#include <wtf/HashMap.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
struct V8NPObject;
typedef WTF::Vector<V8NPObject*> V8NPObjectVector;
typedef WTF::HashMap<int, V8NPObjectVector> V8NPObjectMap;
enum V8ContextEmbedderDataField {
v8ContextDebugIdIndex,
v8ContextPerContextDataIndex,
v8ContextIsolatedWorld,
// Rather than adding more embedder data fields to v8::Context,
// consider adding the data to V8PerContextData instead.
};
class V8PerContextData {
public:
static PassOwnPtr<V8PerContextData> create(v8::Persistent<v8::Context> context)
{
return adoptPtr(new V8PerContextData(context));
}
~V8PerContextData()
{
dispose();
}
bool init();
static V8PerContextData* from(v8::Handle<v8::Context> context)
{
return static_cast<V8PerContextData*>(context->GetAlignedPointerFromEmbedderData(v8ContextPerContextDataIndex));
}
// To create JS Wrapper objects, we create a cache of a 'boiler plate'
// object, and then simply Clone that object each time we need a new one.
// This is faster than going through the full object creation process.
v8::Local<v8::Object> createWrapperFromCache(WrapperTypeInfo* type)
{
v8::Persistent<v8::Object> boilerplate = m_wrapperBoilerplates.get(type);
return !boilerplate.IsEmpty() ? boilerplate->Clone() : createWrapperFromCacheSlowCase(type);
}
v8::Local<v8::Function> constructorForType(WrapperTypeInfo* type)
{
v8::Persistent<v8::Function> function = m_constructorMap.get(type);
if (!function.IsEmpty())
return v8::Local<v8::Function>::New(function);
return constructorForTypeSlowCase(type);
}
V8NPObjectMap* v8NPObjectMap()
{
return &m_v8NPObjectMap;
}
private:
explicit V8PerContextData(v8::Persistent<v8::Context> context)
: m_context(context)
{
}
void dispose();
v8::Local<v8::Object> createWrapperFromCacheSlowCase(WrapperTypeInfo*);
v8::Local<v8::Function> constructorForTypeSlowCase(WrapperTypeInfo*);
// For each possible type of wrapper, we keep a boilerplate object.
// The boilerplate is used to create additional wrappers of the same type.
typedef WTF::HashMap<WrapperTypeInfo*, v8::Persistent<v8::Object> > WrapperBoilerplateMap;
WrapperBoilerplateMap m_wrapperBoilerplates;
typedef WTF::HashMap<WrapperTypeInfo*, v8::Persistent<v8::Function> > ConstructorMap;
ConstructorMap m_constructorMap;
V8NPObjectMap m_v8NPObjectMap;
v8::Persistent<v8::Context> m_context;
ScopedPersistent<v8::Value> m_errorPrototype;
ScopedPersistent<v8::Value> m_objectPrototype;
};
} // namespace WebCore
#endif // V8PerContextData_h
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