V8DOMWindowShell* ScriptController::windowShell(DOMWrapperWorld* world)
{
ASSERT(world);
V8DOMWindowShell* shell = 0;
if (world->isMainWorld())
shell = m_windowShell.get();
else {
IsolatedWorldMap::iterator iter = m_isolatedWorlds.find(world->worldId());
if (iter != m_isolatedWorlds.end())
shell = iter->value.get();
else {
OwnPtr<V8DOMWindowShell> isolatedWorldShell = V8DOMWindowShell::create(m_frame, world, m_isolate);
shell = isolatedWorldShell.get();
m_isolatedWorlds.set(world->worldId(), isolatedWorldShell.release());
}
}
if (!shell->isContextInitialized() && shell->initializeIfNeeded()) {
if (world->isMainWorld()) {
// FIXME: Remove this if clause. See comment with existingWindowShellWorkaroundWorld().
m_frame->loader()->dispatchDidClearWindowObjectInWorld(existingWindowShellWorkaroundWorld());
} else
m_frame->loader()->dispatchDidClearWindowObjectInWorld(world);
}
return shell;
}
void ScriptController::evaluateInIsolatedWorld(int worldID, const Vector<ScriptSourceCode>& sources, int extensionGroup, Vector<ScriptValue>* results)
{
// Except in the test runner, worldID should be non 0 as it conflicts with the mainWorldId.
// FIXME: Change the test runner to perform this swap and make this an ASSERT.
if (UNLIKELY(!worldID))
worldID = DOMWrapperWorld::uninitializedWorldId;
v8::HandleScope handleScope;
v8::Local<v8::Array> v8Results;
{
v8::HandleScope evaluateHandleScope;
V8DOMWindowShell* isolatedWorldShell = ensureIsolatedWorldContext(worldID, extensionGroup);
if (worldID != DOMWrapperWorld::uninitializedWorldId) {
IsolatedWorldSecurityOriginMap::iterator securityOriginIter = m_isolatedWorldSecurityOrigins.find(worldID);
if (securityOriginIter != m_isolatedWorldSecurityOrigins.end())
isolatedWorldShell->setIsolatedWorldSecurityOrigin(securityOriginIter->value);
}
isolatedWorldShell->initializeIfNeeded();
if (isolatedWorldShell->context().IsEmpty())
return;
v8::Local<v8::Context> context = v8::Local<v8::Context>::New(isolatedWorldShell->context());
v8::Context::Scope contextScope(context);
v8::Local<v8::Array> resultArray = v8::Array::New(sources.size());
for (size_t i = 0; i < sources.size(); ++i) {
v8::Local<v8::Value> evaluationResult = compileAndRunScript(sources[i]);
if (evaluationResult.IsEmpty())
evaluationResult = v8::Local<v8::Value>::New(v8::Undefined());
resultArray->Set(i, evaluationResult);
}
// Mark temporary shell for weak destruction.
if (worldID == DOMWrapperWorld::uninitializedWorldId) {
int actualWorldId = isolatedWorldShell->world()->worldId();
m_isolatedWorlds.remove(actualWorldId);
isolatedWorldShell->destroyIsolatedShell();
}
v8Results = evaluateHandleScope.Close(resultArray);
}
if (results && !v8Results.IsEmpty()) {
for (size_t i = 0; i < v8Results->Length(); ++i)
results->append(ScriptValue(v8Results->Get(i)));
}
}
// Create a new environment and setup the global object.
//
// The global object corresponds to a DOMWindow instance. However, to
// allow properties of the JS DOMWindow instance to be shadowed, we
// use a shadow object as the global object and use the JS DOMWindow
// instance as the prototype for that shadow object. The JS DOMWindow
// instance is undetectable from JavaScript code because the __proto__
// accessors skip that object.
//
// The shadow object and the DOMWindow instance are seen as one object
// from JavaScript. The JavaScript object that corresponds to a
// DOMWindow instance is the shadow object. When mapping a DOMWindow
// instance to a V8 object, we return the shadow object.
//
// To implement split-window, see
// 1) https://bugs.webkit.org/show_bug.cgi?id=17249
// 2) https://wiki.mozilla.org/Gecko:SplitWindow
// 3) https://bugzilla.mozilla.org/show_bug.cgi?id=296639
// we need to split the shadow object further into two objects:
// an outer window and an inner window. The inner window is the hidden
// prototype of the outer window. The inner window is the default
// global object of the context. A variable declared in the global
// scope is a property of the inner window.
//
// The outer window sticks to a Frame, it is exposed to JavaScript
// via window.window, window.self, window.parent, etc. The outer window
// has a security token which is the domain. The outer window cannot
// have its own properties. window.foo = 'x' is delegated to the
// inner window.
//
// When a frame navigates to a new page, the inner window is cut off
// the outer window, and the outer window identify is preserved for
// the frame. However, a new inner window is created for the new page.
// If there are JS code holds a closure to the old inner window,
// it won't be able to reach the outer window via its global object.
bool V8DOMWindowShell::initializeIfNeeded()
{
if (!m_context.isEmpty())
return true;
v8::HandleScope handleScope;
initializeV8IfNeeded();
createContext();
if (m_context.isEmpty())
return false;
bool isMainWorld = m_world->isMainWorld();
v8::Local<v8::Context> context = v8::Local<v8::Context>::New(m_context.get());
v8::Context::Scope contextScope(context);
if (m_global.isEmpty()) {
m_global.set(context->Global());
if (m_global.isEmpty()) {
disposeContext();
return false;
}
}
// Flag context as isolated.
if (!isMainWorld) {
V8DOMWindowShell* mainWindow = m_frame->script()->windowShell();
mainWindow->initializeIfNeeded();
if (!mainWindow->context().IsEmpty())
setInjectedScriptContextDebugId(m_context.get(), m_frame->script()->contextDebugId(mainWindow->context()));
setIsolatedWorldField(this, context);
}
m_perContextData = V8PerContextData::create(m_context.get());
if (!m_perContextData->init()) {
disposeContext();
return false;
}
if (!installDOMWindow()) {
disposeContext();
return false;
}
if (isMainWorld) {
updateDocument();
setSecurityToken();
if (m_frame->document())
context->AllowCodeGenerationFromStrings(m_frame->document()->contentSecurityPolicy()->allowEval(0, ContentSecurityPolicy::SuppressReport));
} else {
// Using the default security token means that the canAccess is always
// called, which is slow.
// FIXME: Use tokens where possible. This will mean keeping track of all
// created contexts so that they can all be updated when the
// document domain
// changes.
m_context->UseDefaultSecurityToken();
}
m_frame->loader()->client()->didCreateScriptContext(m_context.get(), m_world->extensionGroup(), m_world->worldId());
if (isMainWorld) {
// FIXME: This call is probably in the wrong spot, but causes a test timeout for http/tests/misc/window-open-then-write.html when removed.
// Additionally, ScriptController::existingWindowShell cannot be correctly implemented until this call is gone.
m_frame->loader()->dispatchDidClearWindowObjectInWorld(0);
}
return true;
}