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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/CycleCollectedJSContext.h"
#include "mozilla/dom/FunctionBinding.h"
#include "nsContentUtils.h"
#include "nsThreadUtils.h"
#include "nsHostObjectProtocolHandler.h"
using mozilla::AutoSlowOperation;
using mozilla::CycleCollectedJSContext;
using mozilla::ErrorResult;
using mozilla::IgnoredErrorResult;
using mozilla::MicroTaskRunnable;
using mozilla::dom::VoidFunction;
nsIGlobalObject::~nsIGlobalObject()
{
UnlinkHostObjectURIs();
}
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)
{
mURIs.SwapElements(aURIs);
}
NS_IMETHOD Run() override
{
MOZ_ASSERT(NS_IsMainThread());
for (uint32_t index = 0; index < mURIs.Length(); ++index) {
nsHostObjectProtocolHandler::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) {
nsHostObjectProtocolHandler::RemoveDataEntry(mHostObjectURIs[index]);
}
mHostObjectURIs.Clear();
return;
}
// nsHostObjectProtocolHandler 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) {
nsHostObjectProtocolHandler::Traverse(mHostObjectURIs[index], aCb);
}
}
class QueuedMicrotask : public MicroTaskRunnable {
public:
QueuedMicrotask(nsIGlobalObject* aGlobal, VoidFunction& aCallback)
: mGlobal(aGlobal)
, mCallback(&aCallback)
{}
/* unsafe */
void Run(AutoSlowOperation& aAso) final {
IgnoredErrorResult rv;
mCallback->Call(static_cast<ErrorResult&>(rv));
}
bool Suppressed() final { return mGlobal->IsInSyncOperation(); }
private:
nsCOMPtr<nsIGlobalObject> mGlobal;
RefPtr<VoidFunction> mCallback;
};
void nsIGlobalObject::QueueMicrotask(VoidFunction& aCallback) {
CycleCollectedJSContext* context = CycleCollectedJSContext::Get();
if (context) {
RefPtr<MicroTaskRunnable> mt = new QueuedMicrotask(this, aCallback);
context->DispatchMicroTaskRunnable(mt.forget());
}
}
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