зеркало из https://github.com/mozilla/gecko-dev.git
336 строки
10 KiB
C++
336 строки
10 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Logging.h"
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#include "nsAutoPtr.h"
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#include "nsIConsoleService.h"
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#include "nsIObserverService.h"
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#include "nsIObserver.h"
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#include "nsIScriptError.h"
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#include "nsObserverService.h"
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#include "nsObserverList.h"
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#include "nsServiceManagerUtils.h"
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#include "nsThreadUtils.h"
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#include "nsEnumeratorUtils.h"
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#include "xpcpublic.h"
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#include "mozilla/net/NeckoCommon.h"
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#include "mozilla/Services.h"
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#include "mozilla/Telemetry.h"
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#include "mozilla/TimeStamp.h"
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#include "nsString.h"
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#include "GeckoProfiler.h"
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#define NOTIFY_GLOBAL_OBSERVERS
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static const uint32_t kMinTelemetryNotifyObserversLatencyMs = 1;
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// Log module for nsObserverService logging...
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//
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// To enable logging (see prlog.h for full details):
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//
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// set MOZ_LOG=ObserverService:5
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// set MOZ_LOG_FILE=service.log
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//
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// This enables LogLevel::Debug level information and places all output in
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// the file service.log.
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static mozilla::LazyLogModule sObserverServiceLog("ObserverService");
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#define LOG(x) MOZ_LOG(sObserverServiceLog, mozilla::LogLevel::Debug, x)
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using namespace mozilla;
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NS_IMETHODIMP
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nsObserverService::CollectReports(nsIHandleReportCallback* aHandleReport,
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nsISupports* aData, bool aAnonymize)
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{
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struct SuspectObserver
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{
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SuspectObserver(const char* aTopic, size_t aReferentCount)
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: mTopic(aTopic)
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, mReferentCount(aReferentCount)
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{}
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const char* mTopic;
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size_t mReferentCount;
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};
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size_t totalNumStrong = 0;
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size_t totalNumWeakAlive = 0;
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size_t totalNumWeakDead = 0;
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nsTArray<SuspectObserver> suspectObservers;
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for (auto iter = mObserverTopicTable.Iter(); !iter.Done(); iter.Next()) {
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nsObserverList* observerList = iter.Get();
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if (!observerList) {
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continue;
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}
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size_t topicNumStrong = 0;
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size_t topicNumWeakAlive = 0;
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size_t topicNumWeakDead = 0;
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nsTArray<ObserverRef>& observers = observerList->mObservers;
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for (uint32_t i = 0; i < observers.Length(); i++) {
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if (observers[i].isWeakRef) {
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nsCOMPtr<nsIObserver> observerRef(
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do_QueryReferent(observers[i].asWeak()));
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if (observerRef) {
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topicNumWeakAlive++;
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} else {
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topicNumWeakDead++;
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}
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} else {
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topicNumStrong++;
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}
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}
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totalNumStrong += topicNumStrong;
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totalNumWeakAlive += topicNumWeakAlive;
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totalNumWeakDead += topicNumWeakDead;
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// Keep track of topics that have a suspiciously large number
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// of referents (symptom of leaks).
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size_t topicTotal = topicNumStrong + topicNumWeakAlive + topicNumWeakDead;
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if (topicTotal > kSuspectReferentCount) {
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SuspectObserver suspect(observerList->GetKey(), topicTotal);
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suspectObservers.AppendElement(suspect);
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}
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}
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// These aren't privacy-sensitive and so don't need anonymizing.
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for (uint32_t i = 0; i < suspectObservers.Length(); i++) {
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SuspectObserver& suspect = suspectObservers[i];
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nsPrintfCString suspectPath("observer-service-suspect/referent(topic=%s)",
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suspect.mTopic);
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aHandleReport->Callback(
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/* process */ EmptyCString(),
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suspectPath, KIND_OTHER, UNITS_COUNT, suspect.mReferentCount,
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NS_LITERAL_CSTRING("A topic with a suspiciously large number of "
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"referents. This may be symptomatic of a leak "
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"if the number of referents is high with "
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"respect to the number of windows."),
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aData);
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}
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MOZ_COLLECT_REPORT(
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"observer-service/referent/strong", KIND_OTHER, UNITS_COUNT,
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totalNumStrong,
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"The number of strong references held by the observer service.");
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MOZ_COLLECT_REPORT(
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"observer-service/referent/weak/alive", KIND_OTHER, UNITS_COUNT,
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totalNumWeakAlive,
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"The number of weak references held by the observer service that are "
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"still alive.");
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MOZ_COLLECT_REPORT(
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"observer-service/referent/weak/dead", KIND_OTHER, UNITS_COUNT,
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totalNumWeakDead,
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"The number of weak references held by the observer service that are "
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"dead.");
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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// nsObserverService Implementation
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NS_IMPL_ISUPPORTS(nsObserverService,
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nsIObserverService,
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nsObserverService,
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nsIMemoryReporter)
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nsObserverService::nsObserverService()
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: mShuttingDown(false)
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{
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}
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nsObserverService::~nsObserverService(void)
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{
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Shutdown();
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}
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void
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nsObserverService::RegisterReporter()
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{
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RegisterWeakMemoryReporter(this);
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}
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void
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nsObserverService::Shutdown()
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{
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UnregisterWeakMemoryReporter(this);
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mShuttingDown = true;
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mObserverTopicTable.Clear();
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}
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nsresult
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nsObserverService::Create(nsISupports* aOuter, const nsIID& aIID,
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void** aInstancePtr)
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{
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LOG(("nsObserverService::Create()"));
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RefPtr<nsObserverService> os = new nsObserverService();
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if (!os) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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// The memory reporter can not be immediately registered here because
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// the nsMemoryReporterManager may attempt to get the nsObserverService
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// during initialization, causing a recursive GetService.
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NS_DispatchToCurrentThread(
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NewRunnableMethod("nsObserverService::RegisterReporter",
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os,
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&nsObserverService::RegisterReporter));
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return os->QueryInterface(aIID, aInstancePtr);
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}
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#define NS_ENSURE_VALIDCALL \
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if (!NS_IsMainThread()) { \
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MOZ_CRASH("Using observer service off the main thread!"); \
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return NS_ERROR_UNEXPECTED; \
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} \
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if (mShuttingDown) { \
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NS_ERROR("Using observer service after XPCOM shutdown!"); \
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return NS_ERROR_ILLEGAL_DURING_SHUTDOWN; \
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}
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NS_IMETHODIMP
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nsObserverService::AddObserver(nsIObserver* aObserver, const char* aTopic,
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bool aOwnsWeak)
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{
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LOG(("nsObserverService::AddObserver(%p: %s)",
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(void*)aObserver, aTopic));
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NS_ENSURE_VALIDCALL
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if (NS_WARN_IF(!aObserver) || NS_WARN_IF(!aTopic)) {
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return NS_ERROR_INVALID_ARG;
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}
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// Specifically allow http-on-opening-request and http-on-stop-request in the
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// child process; see bug 1269765.
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if (mozilla::net::IsNeckoChild() && !strncmp(aTopic, "http-on-", 8) &&
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strcmp(aTopic, "http-on-opening-request") &&
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strcmp(aTopic, "http-on-stop-request")) {
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nsCOMPtr<nsIConsoleService> console(do_GetService(NS_CONSOLESERVICE_CONTRACTID));
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nsCOMPtr<nsIScriptError> error(do_CreateInstance(NS_SCRIPTERROR_CONTRACTID));
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error->Init(NS_LITERAL_STRING("http-on-* observers only work in the parent process"),
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EmptyString(), EmptyString(), 0, 0,
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nsIScriptError::warningFlag, "chrome javascript",
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false /* from private window */);
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console->LogMessage(error);
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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nsObserverList* observerList = mObserverTopicTable.PutEntry(aTopic);
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if (!observerList) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return observerList->AddObserver(aObserver, aOwnsWeak);
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}
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NS_IMETHODIMP
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nsObserverService::RemoveObserver(nsIObserver* aObserver, const char* aTopic)
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{
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LOG(("nsObserverService::RemoveObserver(%p: %s)",
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(void*)aObserver, aTopic));
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NS_ENSURE_VALIDCALL
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if (NS_WARN_IF(!aObserver) || NS_WARN_IF(!aTopic)) {
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return NS_ERROR_INVALID_ARG;
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}
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nsObserverList* observerList = mObserverTopicTable.GetEntry(aTopic);
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if (!observerList) {
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return NS_ERROR_FAILURE;
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}
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/* This death grip is to protect against stupid consumers who call
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RemoveObserver from their Destructor, see bug 485834/bug 325392. */
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nsCOMPtr<nsIObserver> kungFuDeathGrip(aObserver);
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return observerList->RemoveObserver(aObserver);
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}
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NS_IMETHODIMP
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nsObserverService::EnumerateObservers(const char* aTopic,
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nsISimpleEnumerator** anEnumerator)
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{
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NS_ENSURE_VALIDCALL
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if (NS_WARN_IF(!anEnumerator) || NS_WARN_IF(!aTopic)) {
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return NS_ERROR_INVALID_ARG;
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}
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nsObserverList* observerList = mObserverTopicTable.GetEntry(aTopic);
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if (!observerList) {
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return NS_NewEmptyEnumerator(anEnumerator);
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}
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observerList->GetObserverList(anEnumerator);
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return NS_OK;
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}
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// Enumerate observers of aTopic and call Observe on each.
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NS_IMETHODIMP nsObserverService::NotifyObservers(nsISupports* aSubject,
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const char* aTopic,
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const char16_t* aSomeData)
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{
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LOG(("nsObserverService::NotifyObservers(%s)", aTopic));
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NS_ENSURE_VALIDCALL
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if (NS_WARN_IF(!aTopic)) {
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return NS_ERROR_INVALID_ARG;
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}
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mozilla::TimeStamp start = TimeStamp::Now();
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AUTO_PROFILER_LABEL_DYNAMIC_CSTR(
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"nsObserverService::NotifyObservers", OTHER, aTopic);
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nsObserverList* observerList = mObserverTopicTable.GetEntry(aTopic);
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if (observerList) {
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observerList->NotifyObservers(aSubject, aTopic, aSomeData);
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}
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#ifdef NOTIFY_GLOBAL_OBSERVERS
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observerList = mObserverTopicTable.GetEntry("*");
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if (observerList) {
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observerList->NotifyObservers(aSubject, aTopic, aSomeData);
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}
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#endif
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uint32_t latencyMs = round((TimeStamp::Now() - start).ToMilliseconds());
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if (latencyMs >= kMinTelemetryNotifyObserversLatencyMs) {
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Telemetry::Accumulate(Telemetry::NOTIFY_OBSERVERS_LATENCY_MS,
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nsDependentCString(aTopic),
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latencyMs);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsObserverService::UnmarkGrayStrongObservers()
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{
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NS_ENSURE_VALIDCALL
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nsCOMArray<nsIObserver> strongObservers;
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for (auto iter = mObserverTopicTable.Iter(); !iter.Done(); iter.Next()) {
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nsObserverList* aObserverList = iter.Get();
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if (aObserverList) {
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aObserverList->AppendStrongObservers(strongObservers);
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}
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}
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for (uint32_t i = 0; i < strongObservers.Length(); ++i) {
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xpc_TryUnmarkWrappedGrayObject(strongObservers[i]);
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}
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return NS_OK;
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}
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