gecko-dev/docshell/base/BrowsingContextGroup.cpp

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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 http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/BrowsingContextGroup.h"
#include "mozilla/dom/BrowsingContextBinding.h"
#include "mozilla/dom/BindingUtils.h"
namespace mozilla {
namespace dom {
BrowsingContextGroup::BrowsingContextGroup() {
if (XRE_IsContentProcess()) {
ContentChild::GetSingleton()->HoldBrowsingContextGroup(this);
}
}
bool BrowsingContextGroup::Contains(BrowsingContext* aBrowsingContext) {
return aBrowsingContext->Group() == this;
}
void BrowsingContextGroup::Register(BrowsingContext* aBrowsingContext) {
MOZ_DIAGNOSTIC_ASSERT(aBrowsingContext);
mContexts.PutEntry(aBrowsingContext);
}
void BrowsingContextGroup::Unregister(BrowsingContext* aBrowsingContext) {
MOZ_DIAGNOSTIC_ASSERT(aBrowsingContext);
mContexts.RemoveEntry(aBrowsingContext);
if (mContexts.IsEmpty()) {
// There are no browsing context still referencing this group. We can clear
// all subscribers.
UnsubscribeAllContentParents();
if (XRE_IsContentProcess()) {
ContentChild::GetSingleton()->ReleaseBrowsingContextGroup(this);
// We may have been deleted here as the ContentChild may have held the
// last references to `this`.
// Do not access any members at this point.
}
}
}
void BrowsingContextGroup::Subscribe(ContentParent* aOriginProcess) {
MOZ_DIAGNOSTIC_ASSERT(aOriginProcess);
mSubscribers.PutEntry(aOriginProcess);
aOriginProcess->OnBrowsingContextGroupSubscribe(this);
}
void BrowsingContextGroup::Unsubscribe(ContentParent* aOriginProcess) {
MOZ_DIAGNOSTIC_ASSERT(aOriginProcess);
mSubscribers.RemoveEntry(aOriginProcess);
aOriginProcess->OnBrowsingContextGroupUnsubscribe(this);
}
void BrowsingContextGroup::EnsureSubscribed(ContentParent* aProcess) {
MOZ_DIAGNOSTIC_ASSERT(aProcess);
if (mSubscribers.Contains(aProcess)) {
return;
}
Subscribe(aProcess);
nsTArray<BrowsingContext::IPCInitializer> inits(mContexts.Count());
// First, perform a pre-order walk of our BrowsingContext objects from our
// toplevels. This should visit every active BrowsingContext.
for (auto& context : mToplevels) {
MOZ_DIAGNOSTIC_ASSERT(!IsContextCached(context),
"cached contexts must have a parent");
context->PreOrderWalk([&](BrowsingContext* aContext) {
inits.AppendElement(aContext->GetIPCInitializer());
});
}
// Ensure that cached BrowsingContext objects are also visited, by visiting
// them after mToplevels.
for (auto iter = mCachedContexts.Iter(); !iter.Done(); iter.Next()) {
iter.Get()->GetKey()->PreOrderWalk([&](BrowsingContext* aContext) {
inits.AppendElement(aContext->GetIPCInitializer());
});
}
// We should have visited every browsing context.
MOZ_DIAGNOSTIC_ASSERT(inits.Length() == mContexts.Count(),
"Visited the wrong number of contexts!");
// Send all of our contexts to the target content process.
Unused << aProcess->SendRegisterBrowsingContextGroup(inits);
}
bool BrowsingContextGroup::IsContextCached(BrowsingContext* aContext) const {
MOZ_DIAGNOSTIC_ASSERT(aContext);
return mCachedContexts.Contains(aContext);
}
void BrowsingContextGroup::CacheContext(BrowsingContext* aContext) {
mCachedContexts.PutEntry(aContext);
}
void BrowsingContextGroup::CacheContexts(
const BrowsingContext::Children& aContexts) {
for (BrowsingContext* child : aContexts) {
mCachedContexts.PutEntry(child);
}
}
bool BrowsingContextGroup::EvictCachedContext(BrowsingContext* aContext) {
return mCachedContexts.EnsureRemoved(aContext);
}
BrowsingContextGroup::~BrowsingContextGroup() {
UnsubscribeAllContentParents();
}
void BrowsingContextGroup::UnsubscribeAllContentParents() {
for (auto iter = mSubscribers.Iter(); !iter.Done(); iter.Next()) {
nsRefPtrHashKey<ContentParent>* entry = iter.Get();
entry->GetKey()->OnBrowsingContextGroupUnsubscribe(this);
}
mSubscribers.Clear();
}
nsISupports* BrowsingContextGroup::GetParentObject() const {
return xpc::NativeGlobal(xpc::PrivilegedJunkScope());
}
JSObject* BrowsingContextGroup::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return BrowsingContextGroup_Binding::Wrap(aCx, this, aGivenProto);
}
static StaticRefPtr<BrowsingContextGroup> sChromeGroup;
/* static */
BrowsingContextGroup* BrowsingContextGroup::GetChromeGroup() {
MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess());
if (!sChromeGroup && XRE_IsParentProcess()) {
sChromeGroup = new BrowsingContextGroup();
ClearOnShutdown(&sChromeGroup);
}
return sChromeGroup;
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(BrowsingContextGroup, mContexts,
mToplevels, mSubscribers, mCachedContexts)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(BrowsingContextGroup, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(BrowsingContextGroup, Release)
} // namespace dom
} // namespace mozilla