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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 "base/basictypes.h"
#include "nsFrameMessageManager.h"
#include "ContentChild.h"
#include "GeckoProfiler.h"
#include "nsASCIIMask.h"
#include "nsContentUtils.h"
#include "nsError.h"
#include "nsIXPConnect.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "nsJSUtils.h"
#include "nsJSPrincipals.h"
#include "nsNetUtil.h"
#include "mozilla/dom/ScriptLoader.h"
#include "nsFrameLoader.h"
#include "nsIInputStream.h"
#include "nsIScriptError.h"
#include "nsIConsoleService.h"
#include "nsIMemoryReporter.h"
#include "nsIProtocolHandler.h"
#include "xpcpublic.h"
#include "js/CompilationAndEvaluation.h"
#include "js/JSON.h"
#include "js/SourceText.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/Preferences.h"
#include "mozilla/ScriptPreloader.h"
#include "mozilla/Telemetry.h"
#include "mozilla/dom/ChildProcessMessageManager.h"
#include "mozilla/dom/ChromeMessageBroadcaster.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/MessageManagerBinding.h"
#include "mozilla/dom/MessagePort.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/ContentProcessMessageManager.h"
#include "mozilla/dom/ParentProcessMessageManager.h"
#include "mozilla/dom/PermissionMessageUtils.h"
#include "mozilla/dom/ProcessMessageManager.h"
#include "mozilla/dom/SameProcessMessageQueue.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/dom/ipc/SharedMap.h"
#include "mozilla/dom/ipc/StructuredCloneData.h"
#include "mozilla/dom/DOMStringList.h"
#include "nsPrintfCString.h"
#include "nsXULAppAPI.h"
#include "nsQueryObject.h"
#include "xpcprivate.h"
#include <algorithm>
#include "chrome/common/ipc_channel.h" // for IPC::Channel::kMaximumMessageSize
#ifdef XP_WIN
# if defined(SendMessage)
# undef SendMessage
# endif
#endif
#ifdef FUZZING
# include "MessageManagerFuzzer.h"
#endif
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::dom::ipc;
nsFrameMessageManager::nsFrameMessageManager(MessageManagerCallback* aCallback,
MessageManagerFlags aFlags)
: mChrome(aFlags & MessageManagerFlags::MM_CHROME),
mGlobal(aFlags & MessageManagerFlags::MM_GLOBAL),
mIsProcessManager(aFlags & MessageManagerFlags::MM_PROCESSMANAGER),
mIsBroadcaster(aFlags & MessageManagerFlags::MM_BROADCASTER),
mOwnsCallback(aFlags & MessageManagerFlags::MM_OWNSCALLBACK),
mHandlingMessage(false),
mClosed(false),
mDisconnected(false),
mCallback(aCallback) {
NS_ASSERTION(!mIsBroadcaster || !mCallback,
"Broadcasters cannot have callbacks!");
if (mOwnsCallback) {
mOwnedCallback = WrapUnique(aCallback);
}
}
nsFrameMessageManager::~nsFrameMessageManager() {
for (int32_t i = mChildManagers.Length(); i > 0; --i) {
mChildManagers[i - 1]->Disconnect(false);
}
if (mIsProcessManager) {
if (this == sParentProcessManager) {
sParentProcessManager = nullptr;
}
if (this == sChildProcessManager) {
sChildProcessManager = nullptr;
delete mozilla::dom::SameProcessMessageQueue::Get();
}
if (this == sSameProcessParentManager) {
sSameProcessParentManager = nullptr;
}
}
}
inline void ImplCycleCollectionTraverse(
nsCycleCollectionTraversalCallback& aCallback,
nsMessageListenerInfo& aField, const char* aName, uint32_t aFlags = 0) {
ImplCycleCollectionTraverse(aCallback, aField.mStrongListener, aName, aFlags);
ImplCycleCollectionTraverse(aCallback, aField.mWeakListener, aName, aFlags);
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsFrameMessageManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsFrameMessageManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mListeners)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mChildManagers)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSharedData)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsFrameMessageManager)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mInitialProcessData)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsFrameMessageManager)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mListeners)
for (int32_t i = tmp->mChildManagers.Length(); i > 0; --i) {
tmp->mChildManagers[i - 1]->Disconnect(false);
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mChildManagers)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mSharedData)
tmp->mInitialProcessData.setNull();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsFrameMessageManager)
NS_INTERFACE_MAP_ENTRY(nsISupports)
/* Message managers in child process implement nsIMessageSender.
Message managers in the chrome process are
either broadcasters (if they have subordinate/child message
managers) or they're simple message senders. */
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIMessageSender,
!mChrome || !mIsBroadcaster)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsFrameMessageManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsFrameMessageManager)
void MessageManagerCallback::DoGetRemoteType(nsACString& aRemoteType,
ErrorResult& aError) const {
aRemoteType.Truncate();
mozilla::dom::ProcessMessageManager* parent = GetProcessMessageManager();
if (!parent) {
return;
}
parent->GetRemoteType(aRemoteType, aError);
}
bool MessageManagerCallback::BuildClonedMessageDataForParent(
ContentParent* aParent, StructuredCloneData& aData,
ClonedMessageData& aClonedData) {
return aData.BuildClonedMessageDataForParent(aParent, aClonedData);
}
bool MessageManagerCallback::BuildClonedMessageDataForChild(
ContentChild* aChild, StructuredCloneData& aData,
ClonedMessageData& aClonedData) {
return aData.BuildClonedMessageDataForChild(aChild, aClonedData);
}
void mozilla::dom::ipc::UnpackClonedMessageDataForParent(
const ClonedMessageData& aClonedData, StructuredCloneData& aData) {
aData.BorrowFromClonedMessageDataForParent(aClonedData);
}
void mozilla::dom::ipc::UnpackClonedMessageDataForChild(
const ClonedMessageData& aClonedData, StructuredCloneData& aData) {
aData.BorrowFromClonedMessageDataForChild(aClonedData);
}
void nsFrameMessageManager::AddMessageListener(const nsAString& aMessageName,
MessageListener& aListener,
bool aListenWhenClosed,
ErrorResult& aError) {
auto& listeners = mListeners.LookupForAdd(aMessageName).OrInsert([]() {
return new nsAutoTObserverArray<nsMessageListenerInfo, 1>();
});
uint32_t len = listeners->Length();
for (uint32_t i = 0; i < len; ++i) {
MessageListener* strongListener = listeners->ElementAt(i).mStrongListener;
if (strongListener && *strongListener == aListener) {
return;
}
}
nsMessageListenerInfo* entry = listeners->AppendElement();
entry->mStrongListener = &aListener;
entry->mListenWhenClosed = aListenWhenClosed;
}
void nsFrameMessageManager::RemoveMessageListener(const nsAString& aMessageName,
MessageListener& aListener,
ErrorResult& aError) {
nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners =
mListeners.Get(aMessageName);
if (listeners) {
uint32_t len = listeners->Length();
for (uint32_t i = 0; i < len; ++i) {
MessageListener* strongListener = listeners->ElementAt(i).mStrongListener;
if (strongListener && *strongListener == aListener) {
listeners->RemoveElementAt(i);
return;
}
}
}
}
static already_AddRefed<nsISupports> ToXPCOMMessageListener(
MessageListener& aListener) {
return CallbackObjectHolder<mozilla::dom::MessageListener, nsISupports>(
&aListener)
.ToXPCOMCallback();
}
void nsFrameMessageManager::AddWeakMessageListener(
const nsAString& aMessageName, MessageListener& aListener,
ErrorResult& aError) {
nsCOMPtr<nsISupports> listener(ToXPCOMMessageListener(aListener));
nsWeakPtr weak = do_GetWeakReference(listener);
if (!weak) {
aError.Throw(NS_ERROR_NO_INTERFACE);
return;
}
#ifdef DEBUG
// It's technically possible that one object X could give two different
// nsIWeakReference*'s when you do_GetWeakReference(X). We really don't want
// this to happen; it will break e.g. RemoveWeakMessageListener. So let's
// check that we're not getting ourselves into that situation.
nsCOMPtr<nsISupports> canonical = do_QueryInterface(listener);
for (auto iter = mListeners.Iter(); !iter.Done(); iter.Next()) {
nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners = iter.UserData();
uint32_t count = listeners->Length();
for (uint32_t i = 0; i < count; i++) {
nsWeakPtr weakListener = listeners->ElementAt(i).mWeakListener;
if (weakListener) {
nsCOMPtr<nsISupports> otherCanonical = do_QueryReferent(weakListener);
MOZ_ASSERT((canonical == otherCanonical) == (weak == weakListener));
}
}
}
#endif
auto& listeners = mListeners.LookupForAdd(aMessageName).OrInsert([]() {
return new nsAutoTObserverArray<nsMessageListenerInfo, 1>();
});
uint32_t len = listeners->Length();
for (uint32_t i = 0; i < len; ++i) {
if (listeners->ElementAt(i).mWeakListener == weak) {
return;
}
}
nsMessageListenerInfo* entry = listeners->AppendElement();
entry->mWeakListener = weak;
entry->mListenWhenClosed = false;
}
void nsFrameMessageManager::RemoveWeakMessageListener(
const nsAString& aMessageName, MessageListener& aListener,
ErrorResult& aError) {
nsCOMPtr<nsISupports> listener(ToXPCOMMessageListener(aListener));
nsWeakPtr weak = do_GetWeakReference(listener);
if (!weak) {
aError.Throw(NS_ERROR_NO_INTERFACE);
return;
}
nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners =
mListeners.Get(aMessageName);
if (!listeners) {
return;
}
uint32_t len = listeners->Length();
for (uint32_t i = 0; i < len; ++i) {
if (listeners->ElementAt(i).mWeakListener == weak) {
listeners->RemoveElementAt(i);
return;
}
}
}
void nsFrameMessageManager::LoadScript(const nsAString& aURL,
bool aAllowDelayedLoad,
bool aRunInGlobalScope,
ErrorResult& aError) {
if (aAllowDelayedLoad) {
// Cache for future windows or frames
mPendingScripts.AppendElement(aURL);
mPendingScriptsGlobalStates.AppendElement(aRunInGlobalScope);
}
if (mCallback) {
#ifdef DEBUG_smaug
printf("Will load %s \n", NS_ConvertUTF16toUTF8(aURL).get());
#endif
if (!mCallback->DoLoadMessageManagerScript(aURL, aRunInGlobalScope)) {
aError.Throw(NS_ERROR_FAILURE);
return;
}
}
for (uint32_t i = 0; i < mChildManagers.Length(); ++i) {
RefPtr<nsFrameMessageManager> mm = mChildManagers[i];
if (mm) {
// Use false here, so that child managers don't cache the script, which
// is already cached in the parent.
mm->LoadScript(aURL, false, aRunInGlobalScope, IgnoreErrors());
}
}
}
void nsFrameMessageManager::RemoveDelayedScript(const nsAString& aURL) {
for (uint32_t i = 0; i < mPendingScripts.Length(); ++i) {
if (mPendingScripts[i] == aURL) {
mPendingScripts.RemoveElementAt(i);
mPendingScriptsGlobalStates.RemoveElementAt(i);
break;
}
}
}
void nsFrameMessageManager::GetDelayedScripts(
JSContext* aCx, nsTArray<nsTArray<JS::Value>>& aList, ErrorResult& aError) {
// Frame message managers may return an incomplete list because scripts
// that were loaded after it was connected are not added to the list.
if (!IsGlobal() && !IsBroadcaster()) {
NS_WARNING(
"Cannot retrieve list of pending frame scripts for frame"
"message managers as it may be incomplete");
aError.Throw(NS_ERROR_NOT_IMPLEMENTED);
return;
}
aError.MightThrowJSException();
aList.SetCapacity(mPendingScripts.Length());
for (uint32_t i = 0; i < mPendingScripts.Length(); ++i) {
JS::Rooted<JS::Value> url(aCx);
if (!ToJSValue(aCx, mPendingScripts[i], &url)) {
aError.NoteJSContextException(aCx);
return;
}
nsTArray<JS::Value>* array = aList.AppendElement(2);
array->AppendElement(url);
array->AppendElement(JS::BooleanValue(mPendingScriptsGlobalStates[i]));
}
}
/* static */
bool nsFrameMessageManager::GetParamsForMessage(JSContext* aCx,
const JS::Value& aValue,
const JS::Value& aTransfer,
StructuredCloneData& aData) {
// First try to use structured clone on the whole thing.
JS::RootedValue v(aCx, aValue);
JS::RootedValue t(aCx, aTransfer);
ErrorResult rv;
aData.Write(aCx, v, t, JS::CloneDataPolicy(), rv);
if (!rv.Failed()) {
return true;
}
rv.SuppressException();
JS_ClearPendingException(aCx);
nsCOMPtr<nsIConsoleService> console(
do_GetService(NS_CONSOLESERVICE_CONTRACTID));
if (console) {
nsAutoString filename;
uint32_t lineno = 0, column = 0;
nsJSUtils::GetCallingLocation(aCx, filename, &lineno, &column);
nsCOMPtr<nsIScriptError> error(
do_CreateInstance(NS_SCRIPTERROR_CONTRACTID));
error->Init(
u"Sending message that cannot be cloned. Are "
"you trying to send an XPCOM object?"_ns,
filename, EmptyString(), lineno, column, nsIScriptError::warningFlag,
"chrome javascript", false /* from private window */,
true /* from chrome context */);
console->LogMessage(error);
}
// Not clonable, try JSON
// XXX This is ugly but currently structured cloning doesn't handle
// properly cases when interface is implemented in JS and used
// as a dictionary.
nsAutoString json;
NS_ENSURE_TRUE(nsContentUtils::StringifyJSON(aCx, &v, json), false);
NS_ENSURE_TRUE(!json.IsEmpty(), false);
JS::Rooted<JS::Value> val(aCx, JS::NullValue());
NS_ENSURE_TRUE(JS_ParseJSON(aCx, static_cast<const char16_t*>(json.get()),
json.Length(), &val),
false);
aData.Write(aCx, val, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
return false;
}
return true;
}
static bool sSendingSyncMessage = false;
static bool AllowMessage(size_t aDataLength, const nsAString& aMessageName) {
// A message includes more than structured clone data, so subtract
// 20KB to make it more likely that a message within this bound won't
// result in an overly large IPC message.
static const size_t kMaxMessageSize =
IPC::Channel::kMaximumMessageSize - 20 * 1024;
return aDataLength < kMaxMessageSize;
}
void nsFrameMessageManager::SendSyncMessage(JSContext* aCx,
const nsAString& aMessageName,
JS::Handle<JS::Value> aObj,
nsTArray<JS::Value>& aResult,
ErrorResult& aError) {
NS_ASSERTION(!IsGlobal(), "Should not call SendSyncMessage in chrome");
NS_ASSERTION(!IsBroadcaster(), "Should not call SendSyncMessage in chrome");
NS_ASSERTION(!GetParentManager(),
"Should not have parent manager in content!");
AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING(
"nsFrameMessageManager::SendMessage", OTHER, aMessageName);
if (sSendingSyncMessage) {
// No kind of blocking send should be issued on top of a sync message.
aError.Throw(NS_ERROR_UNEXPECTED);
return;
}
StructuredCloneData data;
if (!aObj.isUndefined() &&
!GetParamsForMessage(aCx, aObj, JS::UndefinedHandleValue, data)) {
aError.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
return;
}
#ifdef FUZZING
if (data.DataLength() > 0) {
MessageManagerFuzzer::TryMutate(aCx, aMessageName, &data,
JS::UndefinedHandleValue);
}
#endif
if (!AllowMessage(data.DataLength(), aMessageName)) {
aError.Throw(NS_ERROR_FAILURE);
return;
}
if (!mCallback) {
aError.Throw(NS_ERROR_NOT_INITIALIZED);
return;
}
nsTArray<StructuredCloneData> retval;
TimeStamp start = TimeStamp::Now();
sSendingSyncMessage = true;
bool ok = mCallback->DoSendBlockingMessage(aMessageName, data, &retval);
sSendingSyncMessage = false;
uint32_t latencyMs = round((TimeStamp::Now() - start).ToMilliseconds());
if (latencyMs >= kMinTelemetrySyncMessageManagerLatencyMs) {
NS_ConvertUTF16toUTF8 messageName(aMessageName);
// NOTE: We need to strip digit characters from the message name in order to
// avoid a large number of buckets due to generated names from addons (such
// as "ublock:sb:{N}"). See bug 1348113 comment 10.
messageName.StripTaggedASCII(ASCIIMask::Mask0to9());
Telemetry::Accumulate(Telemetry::IPC_SYNC_MESSAGE_MANAGER_LATENCY_MS,
messageName, latencyMs);
}
if (!ok) {
return;
}
uint32_t len = retval.Length();
aResult.SetCapacity(len);
for (uint32_t i = 0; i < len; ++i) {
JS::Rooted<JS::Value> ret(aCx);
retval[i].Read(aCx, &ret, aError);
if (aError.Failed()) {
MOZ_ASSERT(false, "Unable to read structured clone in SendMessage");
return;
}
aResult.AppendElement(ret);
}
}
nsresult nsFrameMessageManager::DispatchAsyncMessageInternal(
JSContext* aCx, const nsAString& aMessage, StructuredCloneData& aData) {
if (mIsBroadcaster) {
uint32_t len = mChildManagers.Length();
for (uint32_t i = 0; i < len; ++i) {
mChildManagers[i]->DispatchAsyncMessageInternal(aCx, aMessage, aData);
}
return NS_OK;
}
if (!mCallback) {
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = mCallback->DoSendAsyncMessage(aMessage, aData);
if (NS_FAILED(rv)) {
return rv;
}
return NS_OK;
}
void nsFrameMessageManager::DispatchAsyncMessage(
JSContext* aCx, const nsAString& aMessageName, JS::Handle<JS::Value> aObj,
JS::Handle<JS::Value> aTransfers, ErrorResult& aError) {
StructuredCloneData data;
if (!aObj.isUndefined() &&
!GetParamsForMessage(aCx, aObj, aTransfers, data)) {
aError.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
return;
}
#ifdef FUZZING
if (data.DataLength()) {
MessageManagerFuzzer::TryMutate(aCx, aMessageName, &data, aTransfers);
}
#endif
if (!AllowMessage(data.DataLength(), aMessageName)) {
aError.Throw(NS_ERROR_FAILURE);
return;
}
aError = DispatchAsyncMessageInternal(aCx, aMessageName, data);
}
class MMListenerRemover {
public:
explicit MMListenerRemover(nsFrameMessageManager* aMM)
: mWasHandlingMessage(aMM->mHandlingMessage), mMM(aMM) {
mMM->mHandlingMessage = true;
}
~MMListenerRemover() {
if (!mWasHandlingMessage) {
mMM->mHandlingMessage = false;
if (mMM->mDisconnected) {
mMM->mListeners.Clear();
}
}
}
bool mWasHandlingMessage;
RefPtr<nsFrameMessageManager> mMM;
};
void nsFrameMessageManager::ReceiveMessage(
nsISupports* aTarget, nsFrameLoader* aTargetFrameLoader, bool aTargetClosed,
const nsAString& aMessage, bool aIsSync, StructuredCloneData* aCloneData,
nsTArray<StructuredCloneData>* aRetVal, ErrorResult& aError) {
MOZ_ASSERT(aTarget);
nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners =
mListeners.Get(aMessage);
if (listeners) {
MMListenerRemover lr(this);
nsAutoTObserverArray<nsMessageListenerInfo, 1>::EndLimitedIterator iter(
*listeners);
while (iter.HasMore()) {
nsMessageListenerInfo& listener = iter.GetNext();
// Remove mListeners[i] if it's an expired weak listener.
nsCOMPtr<nsISupports> weakListener;
if (listener.mWeakListener) {
weakListener = do_QueryReferent(listener.mWeakListener);
if (!weakListener) {
iter.Remove();
continue;
}
}
if (!listener.mListenWhenClosed && aTargetClosed) {
continue;
}
JS::RootingContext* rcx = RootingCx();
JS::Rooted<JSObject*> object(rcx);
JS::Rooted<JSObject*> objectGlobal(rcx);
RefPtr<MessageListener> webIDLListener;
if (!weakListener) {
webIDLListener = listener.mStrongListener;
object = webIDLListener->CallbackOrNull();
objectGlobal = webIDLListener->CallbackGlobalOrNull();
} else {
nsCOMPtr<nsIXPConnectWrappedJS> wrappedJS =
do_QueryInterface(weakListener);
if (!wrappedJS) {
continue;
}
object = wrappedJS->GetJSObject();
objectGlobal = wrappedJS->GetJSObjectGlobal();
}
if (!object) {
continue;
}
AutoEntryScript aes(js::UncheckedUnwrap(object),
"message manager handler");
JSContext* cx = aes.cx();
// We passed the unwrapped object to AutoEntryScript so we now need to
// enter the realm of the global object that represents the realm of our
// callback.
JSAutoRealm ar(cx, objectGlobal);
RootedDictionary<ReceiveMessageArgument> argument(cx);
JS::Rooted<JS::Value> json(cx, JS::NullValue());
if (aCloneData && aCloneData->DataLength()) {
aCloneData->Read(cx, &json, aError);
if (NS_WARN_IF(aError.Failed())) {
aError.SuppressException();
JS_ClearPendingException(cx);
return;
}
}
argument.mData = json;
argument.mJson = json;
// Get cloned MessagePort from StructuredCloneData.
if (aCloneData) {
Sequence<OwningNonNull<MessagePort>> ports;
if (!aCloneData->TakeTransferredPortsAsSequence(ports)) {
aError.Throw(NS_ERROR_FAILURE);
return;
}
argument.mPorts.Construct(std::move(ports));
}
argument.mName = aMessage;
argument.mSync = aIsSync;
argument.mTarget = aTarget;
if (aTargetFrameLoader) {
argument.mTargetFrameLoader.Construct(*aTargetFrameLoader);
}
JS::Rooted<JS::Value> thisValue(cx, JS::UndefinedValue());
if (JS::IsCallable(object)) {
// A small hack to get 'this' value right on content side where
// messageManager is wrapped in BrowserChildMessageManager's global.
nsCOMPtr<nsISupports> defaultThisValue;
if (mChrome) {
defaultThisValue = do_QueryObject(this);
} else {
defaultThisValue = aTarget;
}
js::AssertSameCompartment(cx, object);
aError = nsContentUtils::WrapNative(cx, defaultThisValue, &thisValue);
if (aError.Failed()) {
return;
}
}
JS::Rooted<JS::Value> rval(cx, JS::UndefinedValue());
if (webIDLListener) {
webIDLListener->ReceiveMessage(thisValue, argument, &rval, aError);
if (aError.Failed()) {
// At this point the call to ReceiveMessage will have reported any
// exceptions (we kept the default of eReportExceptions). We suppress
// the failure in the ErrorResult and continue.
aError.SuppressException();
continue;
}
} else {
JS::Rooted<JS::Value> funval(cx);
if (JS::IsCallable(object)) {
// If the listener is a JS function:
funval.setObject(*object);
} else {
// If the listener is a JS object which has receiveMessage function:
if (!JS_GetProperty(cx, object, "receiveMessage", &funval) ||
!funval.isObject()) {
aError.Throw(NS_ERROR_UNEXPECTED);
return;
}
// Check if the object is even callable.
if (!JS::IsCallable(&funval.toObject())) {
aError.Throw(NS_ERROR_UNEXPECTED);
return;
}
thisValue.setObject(*object);
}
JS::Rooted<JS::Value> argv(cx);
if (!ToJSValue(cx, argument, &argv)) {
aError.Throw(NS_ERROR_UNEXPECTED);
return;
}
{
JS::Rooted<JSObject*> thisObject(cx, thisValue.toObjectOrNull());
js::AssertSameCompartment(cx, thisObject);
if (!JS_CallFunctionValue(cx, thisObject, funval,
JS::HandleValueArray(argv), &rval)) {
// Because the AutoEntryScript is inside the loop this continue will
// make us report any exceptions (after which we'll move on to the
// next listener).
continue;
}
}
}
if (aRetVal) {
StructuredCloneData* data = aRetVal->AppendElement();
data->InitScope(JS::StructuredCloneScope::DifferentProcess);
data->Write(cx, rval, aError);
if (NS_WARN_IF(aError.Failed())) {
aRetVal->RemoveLastElement();
nsString msg =
aMessage + nsLiteralString(
u": message reply cannot be cloned. Are "
"you trying to send an XPCOM object?");
nsCOMPtr<nsIConsoleService> console(
do_GetService(NS_CONSOLESERVICE_CONTRACTID));
if (console) {
nsCOMPtr<nsIScriptError> error(
do_CreateInstance(NS_SCRIPTERROR_CONTRACTID));
error->Init(msg, EmptyString(), EmptyString(), 0, 0,
nsIScriptError::warningFlag, "chrome javascript",
false /* from private window */,
true /* from chrome context */);
console->LogMessage(error);
}
JS_ClearPendingException(cx);
continue;
}
}
}
}
RefPtr<nsFrameMessageManager> kungFuDeathGrip = GetParentManager();
if (kungFuDeathGrip) {
kungFuDeathGrip->ReceiveMessage(aTarget, aTargetFrameLoader, aTargetClosed,
aMessage, aIsSync, aCloneData, aRetVal,
aError);
}
}
void nsFrameMessageManager::LoadPendingScripts(
nsFrameMessageManager* aManager, nsFrameMessageManager* aChildMM) {
// We have parent manager if we're a message broadcaster.
// In that case we want to load the pending scripts from all parent
// message managers in the hierarchy. Process the parent first so
// that pending scripts higher up in the hierarchy are loaded before others.
nsFrameMessageManager* parentManager = aManager->GetParentManager();
if (parentManager) {
LoadPendingScripts(parentManager, aChildMM);
}
for (uint32_t i = 0; i < aManager->mPendingScripts.Length(); ++i) {
aChildMM->LoadScript(aManager->mPendingScripts[i], false,
aManager->mPendingScriptsGlobalStates[i],
IgnoreErrors());
}
}
void nsFrameMessageManager::LoadPendingScripts() {
RefPtr<nsFrameMessageManager> kungfuDeathGrip = this;
LoadPendingScripts(this, this);
}
void nsFrameMessageManager::SetCallback(MessageManagerCallback* aCallback) {
MOZ_ASSERT(!mIsBroadcaster || !mCallback,
"Broadcasters cannot have callbacks!");
if (aCallback && mCallback != aCallback) {
mCallback = aCallback;
if (mOwnsCallback) {
mOwnedCallback = WrapUnique(aCallback);
}
}
}
void nsFrameMessageManager::Close() {
if (!mClosed) {
if (nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService()) {
obs->NotifyWhenScriptSafe(this, "message-manager-close", nullptr);
}
}
mClosed = true;
mCallback = nullptr;
mOwnedCallback = nullptr;
}
void nsFrameMessageManager::Disconnect(bool aRemoveFromParent) {
// Notify message-manager-close if we haven't already.
Close();
if (!mDisconnected) {
if (nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService()) {
obs->NotifyWhenScriptSafe(this, "message-manager-disconnect", nullptr);
}
}
ClearParentManager(aRemoveFromParent);
mDisconnected = true;
if (!mHandlingMessage) {
mListeners.Clear();
}
}
void nsFrameMessageManager::SetInitialProcessData(
JS::HandleValue aInitialData) {
MOZ_ASSERT(!mChrome);
MOZ_ASSERT(mIsProcessManager);
MOZ_ASSERT(aInitialData.isObject());
mInitialProcessData = aInitialData;
}
void nsFrameMessageManager::GetInitialProcessData(
JSContext* aCx, JS::MutableHandle<JS::Value> aInitialProcessData,
ErrorResult& aError) {
MOZ_ASSERT(mIsProcessManager);
MOZ_ASSERT_IF(mChrome, IsBroadcaster());
JS::RootedValue init(aCx, mInitialProcessData);
if (mChrome && init.isUndefined()) {
// We create the initial object in the junk scope. If we created it in a
// normal realm, that realm would leak until shutdown.
JS::RootedObject global(aCx, xpc::PrivilegedJunkScope());
JSAutoRealm ar(aCx, global);
JS::RootedObject obj(aCx, JS_NewPlainObject(aCx));
if (!obj) {
aError.NoteJSContextException(aCx);
return;
}
mInitialProcessData.setObject(*obj);
init.setObject(*obj);
}
if (!mChrome && XRE_IsParentProcess()) {
// This is the cpmm in the parent process. We should use the same object as
// the ppmm. Create it first through do_GetService and use the cached
// pointer in sParentProcessManager.
nsCOMPtr<nsISupports> ppmm =
do_GetService("@mozilla.org/parentprocessmessagemanager;1");
sParentProcessManager->GetInitialProcessData(aCx, &init, aError);
if (aError.Failed()) {
return;
}
mInitialProcessData = init;
}
if (!JS_WrapValue(aCx, &init)) {
aError.NoteJSContextException(aCx);
return;
}
aInitialProcessData.set(init);
}
WritableSharedMap* nsFrameMessageManager::SharedData() {
if (!mChrome || !mIsProcessManager) {
MOZ_ASSERT(false, "Should only call this binding method on ppmm");
return nullptr;
}
if (!mSharedData) {
mSharedData = new WritableSharedMap();
}
return mSharedData;
}
already_AddRefed<ProcessMessageManager>
nsFrameMessageManager::GetProcessMessageManager(ErrorResult& aError) {
RefPtr<ProcessMessageManager> pmm;
if (mCallback) {
pmm = mCallback->GetProcessMessageManager();
}
return pmm.forget();
}
void nsFrameMessageManager::GetRemoteType(nsACString& aRemoteType,
ErrorResult& aError) const {
aRemoteType.Truncate();
if (mCallback) {
mCallback->DoGetRemoteType(aRemoteType, aError);
}
}
namespace {
struct MessageManagerReferentCount {
MessageManagerReferentCount() : mStrong(0), mWeakAlive(0), mWeakDead(0) {}
size_t mStrong;
size_t mWeakAlive;
size_t mWeakDead;
nsTArray<nsString> mSuspectMessages;
nsDataHashtable<nsStringHashKey, uint32_t> mMessageCounter;
};
} // namespace
namespace mozilla::dom {
class MessageManagerReporter final : public nsIMemoryReporter {
~MessageManagerReporter() = default;
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIMEMORYREPORTER
static const size_t kSuspectReferentCount = 300;
protected:
void CountReferents(nsFrameMessageManager* aMessageManager,
MessageManagerReferentCount* aReferentCount);
};
NS_IMPL_ISUPPORTS(MessageManagerReporter, nsIMemoryReporter)
void MessageManagerReporter::CountReferents(
nsFrameMessageManager* aMessageManager,
MessageManagerReferentCount* aReferentCount) {
for (auto it = aMessageManager->mListeners.Iter(); !it.Done(); it.Next()) {
nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners = it.UserData();
uint32_t listenerCount = listeners->Length();
if (listenerCount == 0) {
continue;
}
nsString key(it.Key());
uint32_t oldCount = 0;
aReferentCount->mMessageCounter.Get(key, &oldCount);
uint32_t currentCount = oldCount + listenerCount;
aReferentCount->mMessageCounter.Put(key, currentCount);
// Keep track of messages that have a suspiciously large
// number of referents (symptom of leak).
if (currentCount >= MessageManagerReporter::kSuspectReferentCount) {
aReferentCount->mSuspectMessages.AppendElement(key);
}
for (uint32_t i = 0; i < listenerCount; ++i) {
const nsMessageListenerInfo& listenerInfo = listeners->ElementAt(i);
if (listenerInfo.mWeakListener) {
nsCOMPtr<nsISupports> referent =
do_QueryReferent(listenerInfo.mWeakListener);
if (referent) {
aReferentCount->mWeakAlive++;
} else {
aReferentCount->mWeakDead++;
}
} else {
aReferentCount->mStrong++;
}
}
}
// Add referent count in child managers because the listeners
// participate in messages dispatched from parent message manager.
for (uint32_t i = 0; i < aMessageManager->mChildManagers.Length(); ++i) {
RefPtr<nsFrameMessageManager> mm = aMessageManager->mChildManagers[i];
CountReferents(mm, aReferentCount);
}
}
static void ReportReferentCount(
const char* aManagerType, const MessageManagerReferentCount& aReferentCount,
nsIHandleReportCallback* aHandleReport, nsISupports* aData) {
#define REPORT(_path, _amount, _desc) \
do { \
aHandleReport->Callback( \
EmptyCString(), _path, nsIMemoryReporter::KIND_OTHER, \
nsIMemoryReporter::UNITS_COUNT, _amount, _desc, aData); \
} while (0)
REPORT(nsPrintfCString("message-manager/referent/%s/strong", aManagerType),
aReferentCount.mStrong,
nsPrintfCString("The number of strong referents held by the message "
"manager in the %s manager.",
aManagerType));
REPORT(
nsPrintfCString("message-manager/referent/%s/weak/alive", aManagerType),
aReferentCount.mWeakAlive,
nsPrintfCString("The number of weak referents that are still alive "
"held by the message manager in the %s manager.",
aManagerType));
REPORT(nsPrintfCString("message-manager/referent/%s/weak/dead", aManagerType),
aReferentCount.mWeakDead,
nsPrintfCString("The number of weak referents that are dead "
"held by the message manager in the %s manager.",
aManagerType));
for (uint32_t i = 0; i < aReferentCount.mSuspectMessages.Length(); i++) {
uint32_t totalReferentCount = 0;
aReferentCount.mMessageCounter.Get(aReferentCount.mSuspectMessages[i],
&totalReferentCount);
NS_ConvertUTF16toUTF8 suspect(aReferentCount.mSuspectMessages[i]);
REPORT(nsPrintfCString("message-manager-suspect/%s/referent(message=%s)",
aManagerType, suspect.get()),
totalReferentCount,
nsPrintfCString("A message in the %s message manager with a "
"suspiciously large number of referents (symptom "
"of a leak).",
aManagerType));
}
#undef REPORT
}
static StaticRefPtr<ChromeMessageBroadcaster> sGlobalMessageManager;
NS_IMETHODIMP
MessageManagerReporter::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) {
if (XRE_IsParentProcess() && sGlobalMessageManager) {
MessageManagerReferentCount count;
CountReferents(sGlobalMessageManager, &count);
ReportReferentCount("global-manager", count, aHandleReport, aData);
}
if (nsFrameMessageManager::sParentProcessManager) {
MessageManagerReferentCount count;
CountReferents(nsFrameMessageManager::sParentProcessManager, &count);
ReportReferentCount("parent-process-manager", count, aHandleReport, aData);
}
if (nsFrameMessageManager::sChildProcessManager) {
MessageManagerReferentCount count;
CountReferents(nsFrameMessageManager::sChildProcessManager, &count);
ReportReferentCount("child-process-manager", count, aHandleReport, aData);
}
return NS_OK;
}
} // namespace mozilla::dom
already_AddRefed<ChromeMessageBroadcaster>
nsFrameMessageManager::GetGlobalMessageManager() {
RefPtr<ChromeMessageBroadcaster> mm;
if (sGlobalMessageManager) {
mm = sGlobalMessageManager;
} else {
sGlobalMessageManager = mm =
new ChromeMessageBroadcaster(MessageManagerFlags::MM_GLOBAL);
ClearOnShutdown(&sGlobalMessageManager);
RegisterStrongMemoryReporter(new MessageManagerReporter());
}
return mm.forget();
}
nsresult NS_NewGlobalMessageManager(nsISupports** aResult) {
*aResult = nsFrameMessageManager::GetGlobalMessageManager().take();
return NS_OK;
}
nsDataHashtable<nsStringHashKey, nsMessageManagerScriptHolder*>*
nsMessageManagerScriptExecutor::sCachedScripts = nullptr;
StaticRefPtr<nsScriptCacheCleaner>
nsMessageManagerScriptExecutor::sScriptCacheCleaner;
void nsMessageManagerScriptExecutor::DidCreateScriptLoader() {
if (!sCachedScripts) {
sCachedScripts =
new nsDataHashtable<nsStringHashKey, nsMessageManagerScriptHolder*>;
sScriptCacheCleaner = new nsScriptCacheCleaner();
}
}
// static
void nsMessageManagerScriptExecutor::PurgeCache() {
if (sCachedScripts) {
NS_ASSERTION(sCachedScripts != nullptr, "Need cached scripts");
for (auto iter = sCachedScripts->Iter(); !iter.Done(); iter.Next()) {
delete iter.Data();
iter.Remove();
}
}
}
// static
void nsMessageManagerScriptExecutor::Shutdown() {
if (sCachedScripts) {
PurgeCache();
delete sCachedScripts;
sCachedScripts = nullptr;
sScriptCacheCleaner = nullptr;
}
}
void nsMessageManagerScriptExecutor::LoadScriptInternal(
JS::Handle<JSObject*> aMessageManager, const nsAString& aURL,
bool aRunInUniqueScope) {
AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING(
"nsMessageManagerScriptExecutor::LoadScriptInternal", OTHER, aURL);
if (!sCachedScripts) {
return;
}
JS::RootingContext* rcx = RootingCx();
JS::Rooted<JSScript*> script(rcx);
nsMessageManagerScriptHolder* holder = sCachedScripts->Get(aURL);
if (holder) {
script = holder->mScript;
} else {
TryCacheLoadAndCompileScript(aURL, aRunInUniqueScope, true, aMessageManager,
&script);
}
AutoEntryScript aes(aMessageManager, "message manager script load");
JSContext* cx = aes.cx();
if (script) {
if (aRunInUniqueScope) {
JS::Rooted<JSObject*> scope(cx);
bool ok = js::ExecuteInFrameScriptEnvironment(cx, aMessageManager, script,
&scope);
if (ok) {
// Force the scope to stay alive.
mAnonymousGlobalScopes.AppendElement(scope);
}
} else {
JS::RootedValue rval(cx);
JS::RootedVector<JSObject*> envChain(cx);
if (!envChain.append(aMessageManager)) {
return;
}
JS::CloneAndExecuteScript(cx, envChain, script, &rval);
}
}
}
void nsMessageManagerScriptExecutor::TryCacheLoadAndCompileScript(
const nsAString& aURL, bool aRunInUniqueScope, bool aShouldCache,
JS::Handle<JSObject*> aMessageManager,
JS::MutableHandle<JSScript*> aScriptp) {
nsCString url = NS_ConvertUTF16toUTF8(aURL);
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_NewURI(getter_AddRefs(uri), url);
if (NS_FAILED(rv)) {
return;
}
bool hasFlags;
rv = NS_URIChainHasFlags(uri, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
&hasFlags);
if (NS_FAILED(rv) || !hasFlags) {
NS_WARNING("Will not load a frame script!");
return;
}
// If this script won't be cached, or there is only one of this type of
// message manager per process, treat this script as run-once. Run-once
// scripts can be compiled directly for the target global, and will be dropped
// from the preloader cache after they're executed and serialized.
bool isRunOnce = !aShouldCache || IsProcessScoped();
// If the script will be reused in this session, compile it in the compilation
// scope instead of the current global to avoid keeping the current
// compartment alive.
AutoJSAPI jsapi;
if (!jsapi.Init(isRunOnce ? aMessageManager : xpc::CompilationScope())) {
return;
}
JSContext* cx = jsapi.cx();
JS::Rooted<JSScript*> script(cx);
script = ScriptPreloader::GetChildSingleton().GetCachedScript(cx, url);
if (!script) {
nsCOMPtr<nsIChannel> channel;
NS_NewChannel(getter_AddRefs(channel), uri,
nsContentUtils::GetSystemPrincipal(),
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL,
nsIContentPolicy::TYPE_OTHER);
if (!channel) {
return;
}
nsCOMPtr<nsIInputStream> input;
rv = channel->Open(getter_AddRefs(input));
NS_ENSURE_SUCCESS_VOID(rv);
nsString dataString;
char16_t* dataStringBuf = nullptr;
size_t dataStringLength = 0;
if (input) {
nsCString buffer;
uint64_t written;
if (NS_FAILED(NS_ReadInputStreamToString(input, buffer, -1, &written))) {
return;
}
uint32_t size = (uint32_t)std::min(written, (uint64_t)UINT32_MAX);
ScriptLoader::ConvertToUTF16(channel, (uint8_t*)buffer.get(), size,
EmptyString(), nullptr, dataStringBuf,
dataStringLength);
}
if (!dataStringBuf || dataStringLength == 0) {
return;
}
JS::UniqueTwoByteChars srcChars(dataStringBuf);
JS::SourceText<char16_t> srcBuf;
if (!srcBuf.init(cx, std::move(srcChars), dataStringLength)) {
return;
}
JS::CompileOptions options(cx);
options.setFileAndLine(url.get(), 1);
options.setNoScriptRval(true);
script = JS::CompileForNonSyntacticScope(cx, options, srcBuf);
if (!script) {
return;
}
}
MOZ_ASSERT(script);
aScriptp.set(script);
nsAutoCString scheme;
uri->GetScheme(scheme);
// We don't cache data: scripts!
if (aShouldCache && !scheme.EqualsLiteral("data")) {
ScriptPreloader::GetChildSingleton().NoteScript(url, url, script,
isRunOnce);
// If this script will only run once per process, only cache it in the
// preloader cache, not the session cache.
if (!isRunOnce) {
// Root the object also for caching.
auto* holder = new nsMessageManagerScriptHolder(cx, script);
sCachedScripts->Put(aURL, holder);
}
}
}
void nsMessageManagerScriptExecutor::Trace(const TraceCallbacks& aCallbacks,
void* aClosure) {
for (size_t i = 0, length = mAnonymousGlobalScopes.Length(); i < length;
++i) {
aCallbacks.Trace(&mAnonymousGlobalScopes[i], "mAnonymousGlobalScopes[i]",
aClosure);
}
}
void nsMessageManagerScriptExecutor::Unlink() {
ImplCycleCollectionUnlink(mAnonymousGlobalScopes);
}
bool nsMessageManagerScriptExecutor::Init() {
DidCreateScriptLoader();
return true;
}
void nsMessageManagerScriptExecutor::MarkScopesForCC() {
for (uint32_t i = 0; i < mAnonymousGlobalScopes.Length(); ++i) {
mAnonymousGlobalScopes[i].exposeToActiveJS();
}
}
NS_IMPL_ISUPPORTS(nsScriptCacheCleaner, nsIObserver)
ChildProcessMessageManager* nsFrameMessageManager::sChildProcessManager =
nullptr;
ParentProcessMessageManager* nsFrameMessageManager::sParentProcessManager =
nullptr;
nsFrameMessageManager* nsFrameMessageManager::sSameProcessParentManager =
nullptr;
class nsAsyncMessageToSameProcessChild : public nsSameProcessAsyncMessageBase,
public Runnable {
public:
nsAsyncMessageToSameProcessChild()
: nsSameProcessAsyncMessageBase(),
mozilla::Runnable("nsAsyncMessageToSameProcessChild") {}
NS_IMETHOD Run() override {
nsFrameMessageManager* ppm =
nsFrameMessageManager::GetChildProcessManager();
ReceiveMessage(ppm, nullptr, ppm);
return NS_OK;
}
};
/**
* Send messages to an imaginary child process in a single-process scenario.
*/
class SameParentProcessMessageManagerCallback : public MessageManagerCallback {
public:
SameParentProcessMessageManagerCallback() {
MOZ_COUNT_CTOR(SameParentProcessMessageManagerCallback);
}
~SameParentProcessMessageManagerCallback() override {
MOZ_COUNT_DTOR(SameParentProcessMessageManagerCallback);
}
bool DoLoadMessageManagerScript(const nsAString& aURL,
bool aRunInGlobalScope) override {
auto* global = ContentProcessMessageManager::Get();
MOZ_ASSERT(!aRunInGlobalScope);
global->LoadScript(aURL);
return true;
}
nsresult DoSendAsyncMessage(const nsAString& aMessage,
StructuredCloneData& aData) override {
RefPtr<nsAsyncMessageToSameProcessChild> ev =
new nsAsyncMessageToSameProcessChild();
nsresult rv = ev->Init(aMessage, aData);
if (NS_FAILED(rv)) {
return rv;
}
rv = NS_DispatchToCurrentThread(ev);
if (NS_FAILED(rv)) {
return rv;
}
return NS_OK;
}
};
/**
* Send messages to the parent process.
*/
class ChildProcessMessageManagerCallback : public MessageManagerCallback {
public:
ChildProcessMessageManagerCallback() {
MOZ_COUNT_CTOR(ChildProcessMessageManagerCallback);
}
~ChildProcessMessageManagerCallback() override {
MOZ_COUNT_DTOR(ChildProcessMessageManagerCallback);
}
bool DoSendBlockingMessage(const nsAString& aMessage,
StructuredCloneData& aData,
nsTArray<StructuredCloneData>* aRetVal) override {
mozilla::dom::ContentChild* cc = mozilla::dom::ContentChild::GetSingleton();
if (!cc) {
return true;
}
ClonedMessageData data;
if (!BuildClonedMessageDataForChild(cc, aData, data)) {
return false;
}
return cc->SendSyncMessage(PromiseFlatString(aMessage), data, aRetVal);
}
nsresult DoSendAsyncMessage(const nsAString& aMessage,
StructuredCloneData& aData) override {
mozilla::dom::ContentChild* cc = mozilla::dom::ContentChild::GetSingleton();
if (!cc) {
return NS_OK;
}
ClonedMessageData data;
if (!BuildClonedMessageDataForChild(cc, aData, data)) {
return NS_ERROR_DOM_DATA_CLONE_ERR;
}
if (!cc->SendAsyncMessage(PromiseFlatString(aMessage), data)) {
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
};
class nsAsyncMessageToSameProcessParent
: public nsSameProcessAsyncMessageBase,
public SameProcessMessageQueue::Runnable {
public:
nsAsyncMessageToSameProcessParent() : nsSameProcessAsyncMessageBase() {}
nsresult HandleMessage() override {
nsFrameMessageManager* ppm =
nsFrameMessageManager::sSameProcessParentManager;
ReceiveMessage(ppm, nullptr, ppm);
return NS_OK;
}
};
/**
* Send messages to the imaginary parent process in a single-process scenario.
*/
class SameChildProcessMessageManagerCallback : public MessageManagerCallback {
public:
SameChildProcessMessageManagerCallback() {
MOZ_COUNT_CTOR(SameChildProcessMessageManagerCallback);
}
~SameChildProcessMessageManagerCallback() override {
MOZ_COUNT_DTOR(SameChildProcessMessageManagerCallback);
}
bool DoSendBlockingMessage(const nsAString& aMessage,
StructuredCloneData& aData,
nsTArray<StructuredCloneData>* aRetVal) override {
SameProcessMessageQueue* queue = SameProcessMessageQueue::Get();
queue->Flush();
if (nsFrameMessageManager::sSameProcessParentManager) {
RefPtr<nsFrameMessageManager> ppm =
nsFrameMessageManager::sSameProcessParentManager;
ppm->ReceiveMessage(ppm, nullptr, aMessage, true, &aData, aRetVal,
IgnoreErrors());
}
return true;
}
nsresult DoSendAsyncMessage(const nsAString& aMessage,
StructuredCloneData& aData) override {
SameProcessMessageQueue* queue = SameProcessMessageQueue::Get();
RefPtr<nsAsyncMessageToSameProcessParent> ev =
new nsAsyncMessageToSameProcessParent();
nsresult rv = ev->Init(aMessage, aData);
if (NS_FAILED(rv)) {
return rv;
}
queue->Push(ev);
return NS_OK;
}
};
// This creates the global parent process message manager.
nsresult NS_NewParentProcessMessageManager(nsISupports** aResult) {
NS_ASSERTION(!nsFrameMessageManager::sParentProcessManager,
"Re-creating sParentProcessManager");
RefPtr<ParentProcessMessageManager> mm = new ParentProcessMessageManager();
nsFrameMessageManager::sParentProcessManager = mm;
nsFrameMessageManager::NewProcessMessageManager(
false); // Create same process message manager.
mm.forget(aResult);
return NS_OK;
}
ProcessMessageManager* nsFrameMessageManager::NewProcessMessageManager(
bool aIsRemote) {
if (!nsFrameMessageManager::sParentProcessManager) {
nsCOMPtr<nsISupports> dummy =
do_GetService("@mozilla.org/parentprocessmessagemanager;1");
}
MOZ_ASSERT(nsFrameMessageManager::sParentProcessManager,
"parent process manager not created");
ProcessMessageManager* mm;
if (aIsRemote) {
// Callback is set in ContentParent::InitInternal so that the process has
// already started when we send pending scripts.
mm = new ProcessMessageManager(
nullptr, nsFrameMessageManager::sParentProcessManager);
} else {
mm =
new ProcessMessageManager(new SameParentProcessMessageManagerCallback(),
nsFrameMessageManager::sParentProcessManager,
MessageManagerFlags::MM_OWNSCALLBACK);
mm->SetOsPid(base::GetCurrentProcId());
sSameProcessParentManager = mm;
}
return mm;
}
nsresult NS_NewChildProcessMessageManager(nsISupports** aResult) {
NS_ASSERTION(!nsFrameMessageManager::GetChildProcessManager(),
"Re-creating sChildProcessManager");
MessageManagerCallback* cb;
if (XRE_IsParentProcess()) {
cb = new SameChildProcessMessageManagerCallback();
} else {
cb = new ChildProcessMessageManagerCallback();
RegisterStrongMemoryReporter(new MessageManagerReporter());
}
auto* mm = new ChildProcessMessageManager(cb);
nsFrameMessageManager::SetChildProcessManager(mm);
auto global = MakeRefPtr<ContentProcessMessageManager>(mm);
NS_ENSURE_TRUE(global->Init(), NS_ERROR_UNEXPECTED);
return CallQueryInterface(global, aResult);
}
void nsFrameMessageManager::MarkForCC() {
for (auto iter = mListeners.Iter(); !iter.Done(); iter.Next()) {
nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners = iter.UserData();
uint32_t count = listeners->Length();
for (uint32_t i = 0; i < count; i++) {
MessageListener* strongListener = listeners->ElementAt(i).mStrongListener;
if (strongListener) {
strongListener->MarkForCC();
}
}
}
if (mRefCnt.IsPurple()) {
mRefCnt.RemovePurple();
}
}
nsSameProcessAsyncMessageBase::nsSameProcessAsyncMessageBase()
#ifdef DEBUG
: mCalledInit(false)
#endif
{
}
nsresult nsSameProcessAsyncMessageBase::Init(const nsAString& aMessage,
StructuredCloneData& aData) {
if (!mData.Copy(aData)) {
Telemetry::Accumulate(Telemetry::IPC_SAME_PROCESS_MESSAGE_COPY_OOM_KB,
aData.DataLength());
return NS_ERROR_OUT_OF_MEMORY;
}
mMessage = aMessage;
#ifdef DEBUG
mCalledInit = true;
#endif
return NS_OK;
}
void nsSameProcessAsyncMessageBase::ReceiveMessage(
nsISupports* aTarget, nsFrameLoader* aTargetFrameLoader,
nsFrameMessageManager* aManager) {
// Make sure that we have called Init() and it has succeeded.
MOZ_ASSERT(mCalledInit);
if (aManager) {
RefPtr<nsFrameMessageManager> mm = aManager;
mm->ReceiveMessage(aTarget, aTargetFrameLoader, mMessage, false, &mData,
nullptr, IgnoreErrors());
}
}