JSDOMWindowShell.cpp   [plain text]

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#include "config.h"
#include "JSDOMWindowShell.h"

#include "Frame.h"
#include "GCController.h"
#include "JSDOMWindow.h"
#include "DOMWindow.h"
#include "ScriptController.h"
#include <heap/StrongInlines.h>
#include <runtime/JSObject.h>

using namespace JSC;

namespace WebCore {

const ClassInfo JSDOMWindowShell::s_info = { "JSDOMWindowShell", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSDOMWindowShell) };

JSDOMWindowShell::JSDOMWindowShell(Structure* structure, DOMWrapperWorld* world)
    : Base(*world->vm(), structure)
    , m_world(world)
{
}

void JSDOMWindowShell::finishCreation(VM& vm, PassRefPtr<DOMWindow> window)
{
    Base::finishCreation(vm);
    ASSERT(inherits(&s_info));
    setWindow(window);
}

void JSDOMWindowShell::destroy(JSCell* cell)
{
    static_cast<JSDOMWindowShell*>(cell)->JSDOMWindowShell::~JSDOMWindowShell();
}

void JSDOMWindowShell::setWindow(JSC::VM& vm, JSDOMWindow* window)
{
    ASSERT_ARG(window, window);
    setTarget(vm, window);
    structure()->setGlobalObject(*JSDOMWindow::commonVM(), window);
    gcController().garbageCollectSoon();
}

void JSDOMWindowShell::setWindow(PassRefPtr<DOMWindow> domWindow)
{
    // Replacing JSDOMWindow via telling JSDOMWindowShell to use the same DOMWindow it already uses makes no sense,
    // so we'd better never try to.
    ASSERT(!window() || domWindow.get() != window()->impl());
    // Explicitly protect the global object's prototype so it isn't collected
    // when we allocate the global object. (Once the global object is fully
    // constructed, it can mark its own prototype.)
    Structure* prototypeStructure = JSDOMWindowPrototype::createStructure(*JSDOMWindow::commonVM(), 0, jsNull());
    Strong<JSDOMWindowPrototype> prototype(*JSDOMWindow::commonVM(), JSDOMWindowPrototype::create(*JSDOMWindow::commonVM(), 0, prototypeStructure));

    Structure* structure = JSDOMWindow::createStructure(*JSDOMWindow::commonVM(), 0, prototype.get());
    JSDOMWindow* jsDOMWindow = JSDOMWindow::create(*JSDOMWindow::commonVM(), structure, domWindow, this);
    prototype->structure()->setGlobalObject(*JSDOMWindow::commonVM(), jsDOMWindow);
    setWindow(*JSDOMWindow::commonVM(), jsDOMWindow);
    ASSERT(jsDOMWindow->globalObject() == jsDOMWindow);
    ASSERT(prototype->globalObject() == jsDOMWindow);
}

// ----
// JSDOMWindow methods
// ----

DOMWindow* JSDOMWindowShell::impl() const
{
    return window()->impl();
}

// ----
// Conversion methods
// ----

JSValue toJS(ExecState* exec, Frame* frame)
{
    if (!frame)
        return jsNull();
    return frame->script()->windowShell(currentWorld(exec));
}

JSDOMWindowShell* toJSDOMWindowShell(Frame* frame, DOMWrapperWorld* isolatedWorld)
{
    if (!frame)
        return 0;
    return frame->script()->windowShell(isolatedWorld);
}

} // namespace WebCore