V8BindingPerContextData.cpp   [plain text]

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#include "config.h"
#include "V8BindingPerContextData.h"

#include "SafeAllocation.h"

namespace WebCore {

void V8BindingPerContextData::dispose()
{
    {
        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();
    }
}

bool V8BindingPerContextData::init()
{
    ASSERT(m_objectPrototype.get().IsEmpty());

    v8::Handle<v8::String> objectString = v8::String::New("Object");
    v8::Handle<v8::String> prototypeString = v8::String::New("prototype");
    if (objectString.IsEmpty() || prototypeString.IsEmpty())
        return false;

    v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(m_context->Global()->Get(objectString));
    if (object.IsEmpty())
        return false;
    v8::Handle<v8::Value> objectPrototype = object->Get(prototypeString);
    if (objectPrototype.IsEmpty())
        return false;

    m_objectPrototype.set(objectPrototype);
    return true;
}

v8::Local<v8::Object> V8BindingPerContextData::createWrapperFromCacheSlowCase(WrapperTypeInfo* type)
{
    ASSERT(!m_objectPrototype.get().IsEmpty());

    v8::Context::Scope scope(m_context);
    v8::Local<v8::Function> function = constructorForType(type);
    v8::Local<v8::Object> instance = SafeAllocation::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> V8BindingPerContextData::constructorForTypeSlowCase(WrapperTypeInfo* type)
{
    ASSERT(!m_objectPrototype.get().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());

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

    return function;
}

} // namespace WebCore