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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef nsIGlobalObject_h__
#define nsIGlobalObject_h__
#include "mozilla/LinkedList.h"
#include "mozilla/Maybe.h"
#include "mozilla/dom/ClientInfo.h"
#include "mozilla/dom/ServiceWorkerDescriptor.h"
#include "mozilla/OriginTrials.h"
#include "nsContentUtils.h"
#include "nsHashKeys.h"
#include "nsISupports.h"
#include "nsRFPService.h"
#include "nsStringFwd.h"
#include "nsTArray.h"
#include "nsTHashtable.h"
#include "js/TypeDecls.h"
// Must be kept in sync with xpcom/rust/xpcom/src/interfaces/
{ \
0x11afa8be, 0xd997, 0x4e07, { \
0xa6, 0xa3, 0x6f, 0x87, 0x2e, 0xc3, 0xee, 0x7f \
} \
class nsCycleCollectionTraversalCallback;
class nsIPrincipal;
class nsPIDOMWindowInner;
namespace mozilla {
class DOMEventTargetHelper;
class GlobalTeardownObserver;
template <typename V, typename E>
class Result;
enum class StorageAccess;
namespace dom {
class VoidFunction;
class DebuggerNotificationManager;
class FontFaceSet;
class Function;
class Report;
class ReportBody;
class ReportingObserver;
class ServiceWorker;
class ServiceWorkerRegistration;
class ServiceWorkerRegistrationDescriptor;
class StorageManager;
enum class CallerType : uint32_t;
} // namespace dom
namespace ipc {
class PrincipalInfo;
} // namespace ipc
} // namespace mozilla
namespace JS::loader {
class ModuleLoaderBase;
} // namespace JS::loader
class nsIGlobalObject : public nsISupports {
nsTArray<nsCString> mHostObjectURIs;
// Raw pointers to bound DETH objects. These are added by
// AddGlobalTeardownObserver().
mozilla::LinkedList<mozilla::GlobalTeardownObserver> mGlobalTeardownObservers;
bool mIsDying;
bool mIsScriptForbidden;
bool mIsInnerWindow;
using RTPCallerType = mozilla::RTPCallerType;
using RFPTarget = mozilla::RFPTarget;
* This check is added to deal with Promise microtask queues. On the main
* thread, we do not impose restrictions about when script stops running or
* when runnables can no longer be dispatched to the main thread. This means
* it is possible for a Promise chain to keep resolving an infinite chain of
* promises, preventing the browser from shutting down. See Bug 1058695. To
* prevent this, the nsGlobalWindow subclass sets this flag when it is
* closed. The Promise implementation checks this and prohibits new runnables
* from being dispatched.
* We pair this with checks during processing the promise microtask queue
* that pops up the slow script dialog when the Promise queue is preventing
* a window from going away.
bool IsDying() const { return mIsDying; }
* Is it currently forbidden to call into script? JS-implemented WebIDL is
* a special case that's always allowed because it has the system principal,
* and callers should indicate this.
bool IsScriptForbidden(JSObject* aCallback,
bool aIsJSImplementedWebIDL = false) const;
* Return the JSObject for this global, if it still has one. Otherwise return
* null.
* If non-null is returned, then the returned object will have been already
* exposed to active JS, so callers do not need to do it.
virtual JSObject* GetGlobalJSObject() = 0;
* Return the JSObject for this global _without_ exposing it to active JS.
* This may return a gray object.
* This method is appropriate to use in assertions (so there is less of a
* difference in GC/CC marking between debug and optimized builds) and in
* situations where we are sure no CC activity can happen while the return
* value is used and the return value does not end up escaping to the heap in
* any way. In all other cases, and in particular in cases where the return
* value is held in a JS::Rooted or passed to the JSAutoRealm constructor, use
* GetGlobalJSObject.
virtual JSObject* GetGlobalJSObjectPreserveColor() const = 0;
* Check whether this nsIGlobalObject still has a JSObject associated with it,
* or whether it's torn-down enough that the JSObject is gone.
bool HasJSGlobal() const { return GetGlobalJSObjectPreserveColor(); }
virtual nsISerialEventTarget* SerialEventTarget() const = 0;
virtual nsresult Dispatch(already_AddRefed<nsIRunnable>&&) const = 0;
// This method is not meant to be overridden.
nsIPrincipal* PrincipalOrNull() const;
void RegisterHostObjectURI(const nsACString& aURI);
void UnregisterHostObjectURI(const nsACString& aURI);
// Any CC class inheriting nsIGlobalObject should call these 2 methods to
// cleanup objects stored in nsIGlobalObject such as blobURLs and Reports.
void UnlinkObjectsInGlobal();
void TraverseObjectsInGlobal(nsCycleCollectionTraversalCallback& aCb);
// GlobalTeardownObservers must register themselves on the global when they
// bind to it in order to get the DisconnectFromOwner() method
// called correctly. RemoveGlobalTeardownObserver() must be called
// before the GlobalTeardownObserver is destroyed.
void AddGlobalTeardownObserver(mozilla::GlobalTeardownObserver* aObject);
void RemoveGlobalTeardownObserver(mozilla::GlobalTeardownObserver* aObject);
// Iterate the registered GlobalTeardownObservers and call the given function
// for each one.
void ForEachGlobalTeardownObserver(
const std::function<void(mozilla::GlobalTeardownObserver*,
bool* aDoneOut)>& aFunc) const;
virtual bool IsInSyncOperation() { return false; }
virtual mozilla::dom::DebuggerNotificationManager*
GetOrCreateDebuggerNotificationManager() {
return nullptr;
virtual mozilla::dom::DebuggerNotificationManager*
GetExistingDebuggerNotificationManager() {
return nullptr;
virtual mozilla::Maybe<mozilla::dom::ClientInfo> GetClientInfo() const;
virtual mozilla::Maybe<nsID> GetAgentClusterId() const;
virtual bool CrossOriginIsolated() const { return false; }
virtual bool IsSharedMemoryAllowed() const { return false; }
virtual mozilla::Maybe<mozilla::dom::ServiceWorkerDescriptor> GetController()
// Get the DOM object for the given descriptor or attempt to create one.
// Creation can still fail and return nullptr during shutdown, etc.
virtual RefPtr<mozilla::dom::ServiceWorker> GetOrCreateServiceWorker(
const mozilla::dom::ServiceWorkerDescriptor& aDescriptor);
// Get the DOM object for the given descriptor or return nullptr if it does
// not exist.
virtual RefPtr<mozilla::dom::ServiceWorkerRegistration>
const mozilla::dom::ServiceWorkerRegistrationDescriptor& aDescriptor)
// Get the DOM object for the given descriptor or attempt to create one.
// Creation can still fail and return nullptr during shutdown, etc.
virtual RefPtr<mozilla::dom::ServiceWorkerRegistration>
const mozilla::dom::ServiceWorkerRegistrationDescriptor& aDescriptor);
* Returns the storage access of this global.
* If you have a global that needs storage access, you should be overriding
* this method in your subclass of this class!
virtual mozilla::StorageAccess GetStorageAccess();
// Returns the set of active origin trials for this global.
virtual mozilla::OriginTrials Trials() const = 0;
// Returns a pointer to this object as an inner window if this is one or
// nullptr otherwise.
nsPIDOMWindowInner* GetAsInnerWindow();
void QueueMicrotask(mozilla::dom::VoidFunction& aCallback);
void RegisterReportingObserver(mozilla::dom::ReportingObserver* aObserver,
bool aBuffered);
void UnregisterReportingObserver(mozilla::dom::ReportingObserver* aObserver);
void BroadcastReport(mozilla::dom::Report* aReport);
MOZ_CAN_RUN_SCRIPT void NotifyReportingObservers();
void RemoveReportRecords();
// This function is set once by CountQueuingStrategy::GetSize.
void SetCountQueuingStrategySizeFunction(mozilla::dom::Function* aFunction);
void SetByteLengthQueuingStrategySizeFunction(
mozilla::dom::Function* aFunction);
* Check whether we should avoid leaking distinguishing information to JS/CSS.
virtual bool ShouldResistFingerprinting(RFPTarget aTarget) const = 0;
// CallerType::System callers never have to resist fingerprinting.
bool ShouldResistFingerprinting(mozilla::dom::CallerType aCallerType,
RFPTarget aTarget) const;
RTPCallerType GetRTPCallerType() const;
* Get the module loader to use for this global, if any. By default this
* returns null.
virtual JS::loader::ModuleLoaderBase* GetModuleLoader(JSContext* aCx) {
return nullptr;
virtual mozilla::dom::FontFaceSet* GetFonts() { return nullptr; }
virtual mozilla::Result<mozilla::ipc::PrincipalInfo, nsresult>
mozilla::Result<bool, nsresult> HasEqualStorageKey(
const mozilla::ipc::PrincipalInfo& aStorageKey);
virtual mozilla::dom::StorageManager* GetStorageManager() { return nullptr; }
* * a Window object whose associated Document is fully active, or
* * a WorkerGlobalScope object whose closing flag is false and whose worker
* is not a suspendable worker.
virtual bool IsEligibleForMessaging() { return false; };
virtual ~nsIGlobalObject();
void StartDying() { mIsDying = true; }
void StartForbiddingScript() { mIsScriptForbidden = true; }
void StopForbiddingScript() { mIsScriptForbidden = false; }
void DisconnectGlobalTeardownObservers();
size_t ShallowSizeOfExcludingThis(mozilla::MallocSizeOf aSizeOf) const;
// List of Report objects for ReportingObservers.
nsTArray<RefPtr<mozilla::dom::ReportingObserver>> mReportingObservers;
nsTArray<RefPtr<mozilla::dom::Report>> mReportRecords;
RefPtr<mozilla::dom::Function> mCountQueuingStrategySizeFunction;
RefPtr<mozilla::dom::Function> mByteLengthQueuingStrategySizeFunction;
#endif // nsIGlobalObject_h__