Source/WebCore/bindings/v8/V8PerContextData.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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#include "config.h"
#include "V8PerContextData.h"

#include "V8Binding.h"
#include "V8HiddenPropertyName.h"
#include "V8ObjectConstructor.h"

namespace WebCore {

V8PerContextData* V8PerContextData::from(v8::Handle<v8::Context> context)
{
    v8::Handle<v8::Value> wrappedPerContextData = toInnerGlobalObject(context)->GetHiddenValue(V8HiddenPropertyName::perContextData());
    if (wrappedPerContextData.IsEmpty())
        return 0;
    return static_cast<V8PerContextData*>(v8::External::Unwrap(wrappedPerContextData));
}

void V8PerContextData::dispose()
{
    v8::HandleScope handleScope;
    toInnerGlobalObject(m_context)->DeleteHiddenValue(V8HiddenPropertyName::perContextData());

    {
        WrapperBoilerplateMap::iterator it = m_wrapperBoilerplates.begin();
        for (; it != m_wrapperBoilerplates.end(); ++it) {
            v8::Persistent<v8::Object> wrapper = it->second;
            wrapper.Dispose();
        }
        m_wrapperBoilerplates.clear();
    }

    {
        ConstructorMap::iterator it = m_constructorMap.begin();
        for (; it != m_constructorMap.end(); ++it) {
            v8::Persistent<v8::Function> wrapper = it->second;
            wrapper.Dispose();
        }
        m_constructorMap.clear();
    }
}

#define V8_STORE_PRIMORDIAL(name, Name) \
{ \
    ASSERT(m_##name##Prototype.get().IsEmpty()); \
    v8::Handle<v8::String> symbol = v8::String::NewSymbol(#Name); \
    if (symbol.IsEmpty()) \
        return false; \
    v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(m_context->Global()->Get(symbol)); \
    if (object.IsEmpty()) \
        return false; \
    v8::Handle<v8::Value> prototypeValue = object->Get(prototypeString); \
    if (prototypeValue.IsEmpty()) \
        return false; \
    m_##name##Prototype.set(prototypeValue); \
}

bool V8PerContextData::init()
{
    toInnerGlobalObject(m_context)->SetHiddenValue(V8HiddenPropertyName::perContextData(), v8::External::Wrap(this));

    v8::Handle<v8::String> prototypeString = v8::String::NewSymbol("prototype");
    if (prototypeString.IsEmpty())
        return false;

    V8_STORE_PRIMORDIAL(error, Error);
    V8_STORE_PRIMORDIAL(object, Object);

    return true;
}

#undef V8_STORE_PRIMORDIAL

v8::Local<v8::Object> V8PerContextData::createWrapperFromCacheSlowCase(WrapperTypeInfo* type)
{
    ASSERT(!m_errorPrototype.isEmpty());
    ASSERT(!m_objectPrototype.isEmpty());

    v8::Context::Scope scope(m_context);
    v8::Local<v8::Function> function = constructorForType(type);
    v8::Local<v8::Object> instance = V8ObjectConstructor::newInstance(function);
    if (!instance.IsEmpty()) {
        m_wrapperBoilerplates.set(type, v8::Persistent<v8::Object>::New(instance));
        return instance->Clone();
    }
    return v8::Local<v8::Object>();
}

v8::Local<v8::Function> V8PerContextData::constructorForTypeSlowCase(WrapperTypeInfo* type)
{
    ASSERT(!m_errorPrototype.isEmpty());
    ASSERT(!m_objectPrototype.isEmpty());

    v8::Context::Scope scope(m_context);
    v8::Handle<v8::FunctionTemplate> functionTemplate = type->getTemplate();
    // Getting the function might fail if we're running out of stack or memory.
    v8::TryCatch tryCatch;
    v8::Local<v8::Function> function = functionTemplate->GetFunction();
    if (function.IsEmpty())
        return v8::Local<v8::Function>();

    function->SetPrototype(m_objectPrototype.get());

    if (type->wrapperTypePrototype == WrapperTypeErrorPrototype) {
        v8::Local<v8::Value> prototypeValue = function->Get(v8::String::NewSymbol("prototype"));
        if (!prototypeValue.IsEmpty() && prototypeValue->IsObject())
            v8::Local<v8::Object>::Cast(prototypeValue)->SetPrototype(m_errorPrototype.get());
    }

    m_constructorMap.set(type, v8::Persistent<v8::Function>::New(function));

    return function;
}

} // namespace WebCore