gecko-dev/dom/base/nsIGlobalObject.cpp

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6.5 KiB
C++

/* -*- 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 http://mozilla.org/MPL/2.0/. */
#include "nsIGlobalObject.h"
#include "mozilla/dom/BlobURLProtocolHandler.h"
#include "mozilla/dom/ServiceWorker.h"
#include "mozilla/dom/ServiceWorkerRegistration.h"
#include "nsContentUtils.h"
#include "nsThreadUtils.h"
#include "nsGlobalWindowInner.h"
using mozilla::DOMEventTargetHelper;
using mozilla::MallocSizeOf;
using mozilla::Maybe;
using mozilla::dom::BlobURLProtocolHandler;
using mozilla::dom::ClientInfo;
using mozilla::dom::ServiceWorker;
using mozilla::dom::ServiceWorkerDescriptor;
using mozilla::dom::ServiceWorkerRegistration;
using mozilla::dom::ServiceWorkerRegistrationDescriptor;
nsIGlobalObject::~nsIGlobalObject() {
UnlinkHostObjectURIs();
DisconnectEventTargetObjects();
MOZ_DIAGNOSTIC_ASSERT(mEventTargetObjects.isEmpty());
}
nsIPrincipal* nsIGlobalObject::PrincipalOrNull() {
JSObject* global = GetGlobalJSObject();
if (NS_WARN_IF(!global)) return nullptr;
return nsContentUtils::ObjectPrincipal(global);
}
void nsIGlobalObject::RegisterHostObjectURI(const nsACString& aURI) {
MOZ_ASSERT(!mHostObjectURIs.Contains(aURI));
mHostObjectURIs.AppendElement(aURI);
}
void nsIGlobalObject::UnregisterHostObjectURI(const nsACString& aURI) {
mHostObjectURIs.RemoveElement(aURI);
}
namespace {
class UnlinkHostObjectURIsRunnable final : public mozilla::Runnable {
public:
explicit UnlinkHostObjectURIsRunnable(nsTArray<nsCString>& aURIs)
: mozilla::Runnable("UnlinkHostObjectURIsRunnable") {
mURIs.SwapElements(aURIs);
}
NS_IMETHOD Run() override {
MOZ_ASSERT(NS_IsMainThread());
for (uint32_t index = 0; index < mURIs.Length(); ++index) {
BlobURLProtocolHandler::RemoveDataEntry(mURIs[index]);
}
return NS_OK;
}
private:
~UnlinkHostObjectURIsRunnable() {}
nsTArray<nsCString> mURIs;
};
} // namespace
void nsIGlobalObject::UnlinkHostObjectURIs() {
if (mHostObjectURIs.IsEmpty()) {
return;
}
if (NS_IsMainThread()) {
for (uint32_t index = 0; index < mHostObjectURIs.Length(); ++index) {
BlobURLProtocolHandler::RemoveDataEntry(mHostObjectURIs[index]);
}
mHostObjectURIs.Clear();
return;
}
// BlobURLProtocolHandler is main-thread only.
RefPtr<UnlinkHostObjectURIsRunnable> runnable =
new UnlinkHostObjectURIsRunnable(mHostObjectURIs);
MOZ_ASSERT(mHostObjectURIs.IsEmpty());
nsresult rv = NS_DispatchToMainThread(runnable);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch a runnable to the main-thread.");
}
}
void nsIGlobalObject::TraverseHostObjectURIs(
nsCycleCollectionTraversalCallback& aCb) {
if (mHostObjectURIs.IsEmpty()) {
return;
}
// Currently we only store BlobImpl objects off the the main-thread and they
// are not CCed.
if (!NS_IsMainThread()) {
return;
}
for (uint32_t index = 0; index < mHostObjectURIs.Length(); ++index) {
BlobURLProtocolHandler::Traverse(mHostObjectURIs[index], aCb);
}
}
void nsIGlobalObject::AddEventTargetObject(DOMEventTargetHelper* aObject) {
MOZ_DIAGNOSTIC_ASSERT(aObject);
MOZ_ASSERT(!aObject->isInList());
mEventTargetObjects.insertBack(aObject);
}
void nsIGlobalObject::RemoveEventTargetObject(DOMEventTargetHelper* aObject) {
MOZ_DIAGNOSTIC_ASSERT(aObject);
MOZ_ASSERT(aObject->isInList());
MOZ_ASSERT(aObject->GetOwnerGlobal() == this);
aObject->remove();
}
void nsIGlobalObject::ForEachEventTargetObject(
const std::function<void(DOMEventTargetHelper*, bool* aDoneOut)>& aFunc)
const {
// Protect against the function call triggering a mutation of the list
// while we are iterating by copying the DETH references to a temporary
// list.
AutoTArray<RefPtr<DOMEventTargetHelper>, 64> targetList;
for (const DOMEventTargetHelper* deth = mEventTargetObjects.getFirst(); deth;
deth = deth->getNext()) {
targetList.AppendElement(const_cast<DOMEventTargetHelper*>(deth));
}
// Iterate the target list and call the function on each one.
bool done = false;
for (auto target : targetList) {
// Check to see if a previous iteration's callback triggered the removal
// of this target as a side-effect. If it did, then just ignore it.
if (target->GetOwnerGlobal() != this) {
continue;
}
aFunc(target, &done);
if (done) {
break;
}
}
}
void nsIGlobalObject::DisconnectEventTargetObjects() {
ForEachEventTargetObject([&](DOMEventTargetHelper* aTarget, bool* aDoneOut) {
aTarget->DisconnectFromOwner();
// Calling DisconnectFromOwner() should result in
// RemoveEventTargetObject() being called.
MOZ_DIAGNOSTIC_ASSERT(aTarget->GetOwnerGlobal() != this);
});
}
Maybe<ClientInfo> nsIGlobalObject::GetClientInfo() const {
// By default globals do not expose themselves as a client. Only real
// window and worker globals are currently considered clients.
return Maybe<ClientInfo>();
}
Maybe<ServiceWorkerDescriptor> nsIGlobalObject::GetController() const {
// By default globals do not have a service worker controller. Only real
// window and worker globals can currently be controlled as a client.
return Maybe<ServiceWorkerDescriptor>();
}
RefPtr<ServiceWorker> nsIGlobalObject::GetOrCreateServiceWorker(
const ServiceWorkerDescriptor& aDescriptor) {
MOZ_DIAGNOSTIC_ASSERT(false,
"this global should not have any service workers");
return nullptr;
}
RefPtr<ServiceWorkerRegistration> nsIGlobalObject::GetServiceWorkerRegistration(
const mozilla::dom::ServiceWorkerRegistrationDescriptor& aDescriptor)
const {
MOZ_DIAGNOSTIC_ASSERT(false,
"this global should not have any service workers");
return nullptr;
}
RefPtr<ServiceWorkerRegistration>
nsIGlobalObject::GetOrCreateServiceWorkerRegistration(
const ServiceWorkerRegistrationDescriptor& aDescriptor) {
MOZ_DIAGNOSTIC_ASSERT(
false, "this global should not have any service worker registrations");
return nullptr;
}
nsPIDOMWindowInner* nsIGlobalObject::AsInnerWindow() {
if (MOZ_LIKELY(mIsInnerWindow)) {
return static_cast<nsPIDOMWindowInner*>(
static_cast<nsGlobalWindowInner*>(this));
}
return nullptr;
}
size_t nsIGlobalObject::ShallowSizeOfExcludingThis(MallocSizeOf aSizeOf) const {
size_t rtn = mHostObjectURIs.ShallowSizeOfExcludingThis(aSizeOf);
return rtn;
}