/* -*- 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 "nsError.h" #include "nsJSEnvironment.h" #include "nsIScriptGlobalObject.h" #include "nsIScriptObjectPrincipal.h" #include "nsIDOMChromeWindow.h" #include "nsPIDOMWindow.h" #include "nsIScriptSecurityManager.h" #include "nsDOMCID.h" #include "nsIServiceManager.h" #include "nsIXPConnect.h" #include "nsCOMPtr.h" #include "nsISupportsPrimitives.h" #include "nsReadableUtils.h" #include "nsDOMJSUtils.h" #include "nsJSUtils.h" #include "nsIDocShell.h" #include "nsIDocShellTreeItem.h" #include "nsPresContext.h" #include "nsIConsoleService.h" #include "nsIScriptError.h" #include "nsIInterfaceRequestor.h" #include "nsIInterfaceRequestorUtils.h" #include "nsIPrompt.h" #include "nsIObserverService.h" #include "nsITimer.h" #include "nsAtom.h" #include "nsContentUtils.h" #include "mozilla/EventDispatcher.h" #include "nsIContent.h" #include "nsCycleCollector.h" #include "nsXPCOMCIDInternal.h" #include "nsIXULRuntime.h" #include "nsTextFormatter.h" #ifdef XP_WIN #include #define getpid _getpid #else #include // for getpid() #endif #include "xpcpublic.h" #include "jsapi.h" #include "js/Wrapper.h" #include "js/SliceBudget.h" #include "nsIArray.h" #include "nsIObjectInputStream.h" #include "nsIObjectOutputStream.h" #include "WrapperFactory.h" #include "nsGlobalWindow.h" #include "mozilla/AutoRestore.h" #include "mozilla/MainThreadIdlePeriod.h" #include "mozilla/StaticPrefs.h" #include "mozilla/StaticPtr.h" #include "mozilla/dom/DOMException.h" #include "mozilla/dom/DOMExceptionBinding.h" #include "mozilla/dom/Element.h" #include "mozilla/dom/ErrorEvent.h" #include "mozilla/dom/FetchUtil.h" #include "mozilla/dom/ScriptSettings.h" #include "mozilla/CycleCollectedJSRuntime.h" #include "mozilla/SystemGroup.h" #include "nsRefreshDriver.h" #include "nsJSPrincipals.h" #ifdef XP_MACOSX // AssertMacros.h defines 'check' and conflicts with AccessCheck.h #undef check #endif #include "AccessCheck.h" #include "mozilla/Logging.h" #include "prthread.h" #include "mozilla/Preferences.h" #include "mozilla/Telemetry.h" #include "mozilla/dom/BindingUtils.h" #include "mozilla/Attributes.h" #include "mozilla/dom/asmjscache/AsmJSCache.h" #include "mozilla/dom/CanvasRenderingContext2DBinding.h" #include "mozilla/ContentEvents.h" #include "mozilla/CycleCollectedJSContext.h" #include "nsCycleCollectionNoteRootCallback.h" #include "GeckoProfiler.h" #include "mozilla/IdleTaskRunner.h" #include "nsIDocShell.h" #include "nsIPresShell.h" #include "nsViewManager.h" #include "mozilla/EventStateManager.h" using namespace mozilla; using namespace mozilla::dom; const size_t gStackSize = 8192; // Thank you Microsoft! #ifdef CompareString #undef CompareString #endif #define NS_SHRINK_GC_BUFFERS_DELAY 4000 // ms // The amount of time we wait from the first request to GC to actually // doing the first GC. #define NS_FIRST_GC_DELAY 10000 // ms #define NS_FULL_GC_DELAY 60000 // ms // Maximum amount of time that should elapse between incremental GC slices #define NS_INTERSLICE_GC_DELAY 100 // ms // The amount of time we wait between a request to CC (after GC ran) // and doing the actual CC. #define NS_CC_DELAY 6000 // ms #define NS_CC_SKIPPABLE_DELAY 250 // ms // ForgetSkippable is usually fast, so we can use small budgets. // This isn't a real budget but a hint to IdleTaskRunner whether there // is enough time to call ForgetSkippable. static const int64_t kForgetSkippableSliceDuration = 2; // Maximum amount of time that should elapse between incremental CC slices static const int64_t kICCIntersliceDelay = 64; // ms // Time budget for an incremental CC slice when using timer to run it. static const int64_t kICCSliceBudget = 3; // ms // Minimum budget for an incremental CC slice when using idle time to run it. static const int64_t kIdleICCSliceBudget = 2; // ms // Maximum total duration for an ICC static const uint32_t kMaxICCDuration = 2000; // ms // Force a CC after this long if there's more than NS_CC_FORCED_PURPLE_LIMIT // objects in the purple buffer. #define NS_CC_FORCED (2 * 60 * PR_USEC_PER_SEC) // 2 min #define NS_CC_FORCED_PURPLE_LIMIT 10 // Don't allow an incremental GC to lock out the CC for too long. #define NS_MAX_CC_LOCKEDOUT_TIME (30 * PR_USEC_PER_SEC) // 30 seconds // Trigger a CC if the purple buffer exceeds this size when we check it. #define NS_CC_PURPLE_LIMIT 200 // Large value used to specify that a script should run essentially forever #define NS_UNLIMITED_SCRIPT_RUNTIME (0x40000000LL << 32) // if you add statics here, add them to the list in StartupJSEnvironment static nsITimer *sGCTimer; static nsITimer *sShrinkingGCTimer; static StaticRefPtr sCCRunner; static StaticRefPtr sICCRunner; static nsITimer *sFullGCTimer; static StaticRefPtr sInterSliceGCRunner; static TimeStamp sLastCCEndTime; static bool sCCLockedOut; static PRTime sCCLockedOutTime; static JS::GCSliceCallback sPrevGCSliceCallback; static bool sHasRunGC; // The number of currently pending document loads. This count isn't // guaranteed to always reflect reality and can't easily as we don't // have an easy place to know when a load ends or is interrupted in // all cases. This counter also gets reset if we end up GC'ing while // we're waiting for a slow page to load. IOW, this count may be 0 // even when there are pending loads. static uint32_t sPendingLoadCount; static bool sLoadingInProgress; static uint32_t sCCollectedWaitingForGC; static uint32_t sCCollectedZonesWaitingForGC; static uint32_t sLikelyShortLivingObjectsNeedingGC; static int32_t sCCRunnerFireCount = 0; static uint32_t sMinForgetSkippableTime = UINT32_MAX; static uint32_t sMaxForgetSkippableTime = 0; static uint32_t sTotalForgetSkippableTime = 0; static uint32_t sRemovedPurples = 0; static uint32_t sForgetSkippableBeforeCC = 0; static uint32_t sPreviousSuspectedCount = 0; static uint32_t sCleanupsSinceLastGC = UINT32_MAX; static bool sNeedsFullCC = false; static bool sNeedsFullGC = false; static bool sNeedsGCAfterCC = false; static bool sIncrementalCC = false; static int32_t sActiveIntersliceGCBudget = 5; // ms; static PRTime sFirstCollectionTime; static bool sIsInitialized; static bool sDidShutdown; static bool sShuttingDown; // nsJSEnvironmentObserver observes the user-interaction-inactive notifications // and triggers a shrinking a garbage collection if the user is still inactive // after NS_SHRINKING_GC_DELAY ms later, if the appropriate pref is set. static bool sIsCompactingOnUserInactive = false; static TimeDuration sGCUnnotifiedTotalTime; static const char* ProcessNameForCollectorLog() { return XRE_GetProcessType() == GeckoProcessType_Default ? "default" : "content"; } namespace xpc { // This handles JS Exceptions (via ExceptionStackOrNull), as well as DOM and XPC // Exceptions. // // Note that the returned stackObj and stackGlobal are _not_ wrapped into the // compartment of exceptionValue. void FindExceptionStackForConsoleReport(nsPIDOMWindowInner* win, JS::HandleValue exceptionValue, JS::MutableHandleObject stackObj, JS::MutableHandleObject stackGlobal) { stackObj.set(nullptr); stackGlobal.set(nullptr); if (!exceptionValue.isObject()) { return; } if (win && win->AsGlobal()->IsDying()) { // Pretend like we have no stack, so we don't end up keeping the global // alive via the stack. return; } JS::RootingContext* rcx = RootingCx(); JS::RootedObject exceptionObject(rcx, &exceptionValue.toObject()); if (JSObject* excStack = JS::ExceptionStackOrNull(exceptionObject)) { // At this point we know exceptionObject is a possibly-wrapped // js::ErrorObject that has excStack as stack. excStack might also be a CCW, // but excStack must be same-compartment with the unwrapped ErrorObject. // Return the ErrorObject's global as stackGlobal. This matches what we do // in the ErrorObject's |.stack| getter and ensures stackObj and stackGlobal // are same-compartment. JSObject* unwrappedException = js::UncheckedUnwrap(exceptionObject); stackObj.set(excStack); stackGlobal.set(JS::GetNonCCWObjectGlobal(unwrappedException)); return; } // It is not a JS Exception, try DOM Exception. RefPtr exception; UNWRAP_OBJECT(DOMException, exceptionObject, exception); if (!exception) { // Not a DOM Exception, try XPC Exception. UNWRAP_OBJECT(Exception, exceptionObject, exception); if (!exception) { return; } } nsCOMPtr stack = exception->GetLocation(); if (!stack) { return; } JS::RootedValue value(rcx); stack->GetNativeSavedFrame(&value); if (value.isObject()) { stackObj.set(&value.toObject()); MOZ_ASSERT(JS::IsUnwrappedSavedFrame(stackObj)); stackGlobal.set(JS::GetNonCCWObjectGlobal(stackObj)); return; } } } /* namespace xpc */ static PRTime GetCollectionTimeDelta() { if (recordreplay::IsRecordingOrReplaying()) { return 0; } PRTime now = PR_Now(); if (sFirstCollectionTime) { return now - sFirstCollectionTime; } sFirstCollectionTime = now; return 0; } static void KillTimers() { nsJSContext::KillGCTimer(); nsJSContext::KillShrinkingGCTimer(); nsJSContext::KillCCRunner(); nsJSContext::KillICCRunner(); nsJSContext::KillFullGCTimer(); nsJSContext::KillInterSliceGCRunner(); } // If we collected a substantial amount of cycles, poke the GC since more objects // might be unreachable now. static bool NeedsGCAfterCC() { return sCCollectedWaitingForGC > 250 || sCCollectedZonesWaitingForGC > 0 || sLikelyShortLivingObjectsNeedingGC > 2500 || sNeedsGCAfterCC; } class nsJSEnvironmentObserver final : public nsIObserver { ~nsJSEnvironmentObserver() {} public: NS_DECL_ISUPPORTS NS_DECL_NSIOBSERVER }; NS_IMPL_ISUPPORTS(nsJSEnvironmentObserver, nsIObserver) NS_IMETHODIMP nsJSEnvironmentObserver::Observe(nsISupports* aSubject, const char* aTopic, const char16_t* aData) { if (!nsCRT::strcmp(aTopic, "memory-pressure")) { if (StaticPrefs::javascript_options_gc_on_memory_pressure()) { if (StringBeginsWith(nsDependentString(aData), NS_LITERAL_STRING("low-memory-ongoing"))) { // Don't GC/CC if we are in an ongoing low-memory state since its very // slow and it likely won't help us anyway. return NS_OK; } nsJSContext::GarbageCollectNow(JS::gcreason::MEM_PRESSURE, nsJSContext::NonIncrementalGC, nsJSContext::ShrinkingGC); nsJSContext::CycleCollectNow(); if (NeedsGCAfterCC()) { nsJSContext::GarbageCollectNow(JS::gcreason::MEM_PRESSURE, nsJSContext::NonIncrementalGC, nsJSContext::ShrinkingGC); } } } else if (!nsCRT::strcmp(aTopic, "user-interaction-inactive")) { if (StaticPrefs::javascript_options_compact_on_user_inactive()) { nsJSContext::PokeShrinkingGC(); } } else if (!nsCRT::strcmp(aTopic, "user-interaction-active")) { nsJSContext::KillShrinkingGCTimer(); if (sIsCompactingOnUserInactive) { AutoJSAPI jsapi; jsapi.Init(); JS::AbortIncrementalGC(jsapi.cx()); } MOZ_ASSERT(!sIsCompactingOnUserInactive); } else if (!nsCRT::strcmp(aTopic, "quit-application") || !nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) { sShuttingDown = true; KillTimers(); } return NS_OK; } /**************************************************************** ************************** AutoFree **************************** ****************************************************************/ class AutoFree { public: explicit AutoFree(void* aPtr) : mPtr(aPtr) { } ~AutoFree() { if (mPtr) free(mPtr); } void Invalidate() { mPtr = 0; } private: void *mPtr; }; // A utility function for script languages to call. Although it looks small, // the use of nsIDocShell and nsPresContext triggers a huge number of // dependencies that most languages would not otherwise need. // XXXmarkh - This function is mis-placed! bool NS_HandleScriptError(nsIScriptGlobalObject *aScriptGlobal, const ErrorEventInit &aErrorEventInit, nsEventStatus *aStatus) { bool called = false; nsCOMPtr win(do_QueryInterface(aScriptGlobal)); nsIDocShell *docShell = win ? win->GetDocShell() : nullptr; if (docShell) { RefPtr presContext; docShell->GetPresContext(getter_AddRefs(presContext)); static int32_t errorDepth; // Recursion prevention ++errorDepth; if (errorDepth < 2) { // Dispatch() must be synchronous for the recursion block // (errorDepth) to work. RefPtr event = ErrorEvent::Constructor(nsGlobalWindowInner::Cast(win), NS_LITERAL_STRING("error"), aErrorEventInit); event->SetTrusted(true); EventDispatcher::DispatchDOMEvent(win, nullptr, event, presContext, aStatus); called = true; } --errorDepth; } return called; } class ScriptErrorEvent : public Runnable { public: ScriptErrorEvent(nsPIDOMWindowInner* aWindow, JS::RootingContext* aRootingCx, xpc::ErrorReport* aReport, JS::Handle aError) : mozilla::Runnable("ScriptErrorEvent") , mWindow(aWindow) , mReport(aReport) , mError(aRootingCx, aError) {} NS_IMETHOD Run() override { nsEventStatus status = nsEventStatus_eIgnore; nsPIDOMWindowInner* win = mWindow; MOZ_ASSERT(win); MOZ_ASSERT(NS_IsMainThread()); // First, notify the DOM that we have a script error, but only if // our window is still the current inner. JS::RootingContext* rootingCx = RootingCx(); if (win->IsCurrentInnerWindow() && win->GetDocShell() && !sHandlingScriptError) { AutoRestore recursionGuard(sHandlingScriptError); sHandlingScriptError = true; RefPtr presContext; win->GetDocShell()->GetPresContext(getter_AddRefs(presContext)); RootedDictionary init(rootingCx); init.mCancelable = true; init.mFilename = mReport->mFileName; init.mBubbles = true; NS_NAMED_LITERAL_STRING(xoriginMsg, "Script error."); if (!mReport->mIsMuted) { init.mMessage = mReport->mErrorMsg; init.mLineno = mReport->mLineNumber; init.mColno = mReport->mColumn; init.mError = mError; } else { NS_WARNING("Not same origin error!"); init.mMessage = xoriginMsg; init.mLineno = 0; } RefPtr event = ErrorEvent::Constructor(nsGlobalWindowInner::Cast(win), NS_LITERAL_STRING("error"), init); event->SetTrusted(true); EventDispatcher::DispatchDOMEvent(win, nullptr, event, presContext, &status); } if (status != nsEventStatus_eConsumeNoDefault) { JS::Rooted stack(rootingCx); JS::Rooted stackGlobal(rootingCx); xpc::FindExceptionStackForConsoleReport(win, mError, &stack, &stackGlobal); mReport->LogToConsoleWithStack(stack, stackGlobal); } return NS_OK; } private: nsCOMPtr mWindow; RefPtr mReport; JS::PersistentRootedValue mError; static bool sHandlingScriptError; }; bool ScriptErrorEvent::sHandlingScriptError = false; // This temporarily lives here to avoid code churn. It will go away entirely // soon. namespace xpc { void DispatchScriptErrorEvent(nsPIDOMWindowInner *win, JS::RootingContext* rootingCx, xpc::ErrorReport *xpcReport, JS::Handle exception) { nsContentUtils::AddScriptRunner(new ScriptErrorEvent(win, rootingCx, xpcReport, exception)); } } /* namespace xpc */ #ifdef DEBUG // A couple of useful functions to call when you're debugging. nsGlobalWindowInner * JSObject2Win(JSObject *obj) { return xpc::WindowOrNull(obj); } template void PrintWinURI(T *win) { if (!win) { printf("No window passed in.\n"); return; } nsCOMPtr doc = win->GetExtantDoc(); if (!doc) { printf("No document in the window.\n"); return; } nsIURI *uri = doc->GetDocumentURI(); if (!uri) { printf("Document doesn't have a URI.\n"); return; } printf("%s\n", uri->GetSpecOrDefault().get()); } void PrintWinURIInner(nsGlobalWindowInner* aWin) { return PrintWinURI(aWin); } void PrintWinURIOuter(nsGlobalWindowOuter* aWin) { return PrintWinURI(aWin); } template void PrintWinCodebase(T *win) { if (!win) { printf("No window passed in.\n"); return; } nsIPrincipal *prin = win->GetPrincipal(); if (!prin) { printf("Window doesn't have principals.\n"); return; } nsCOMPtr uri; prin->GetURI(getter_AddRefs(uri)); if (!uri) { printf("No URI, maybe the system principal.\n"); return; } printf("%s\n", uri->GetSpecOrDefault().get()); } void PrintWinCodebaseInner(nsGlobalWindowInner* aWin) { return PrintWinCodebase(aWin); } void PrintWinCodebaseOuter(nsGlobalWindowOuter* aWin) { return PrintWinCodebase(aWin); } void DumpString(const nsAString &str) { printf("%s\n", NS_ConvertUTF16toUTF8(str).get()); } #endif nsJSContext::nsJSContext(bool aGCOnDestruction, nsIScriptGlobalObject* aGlobalObject) : mWindowProxy(nullptr) , mGCOnDestruction(aGCOnDestruction) , mGlobalObjectRef(aGlobalObject) { EnsureStatics(); mIsInitialized = false; mProcessingScriptTag = false; HoldJSObjects(this); } nsJSContext::~nsJSContext() { mGlobalObjectRef = nullptr; Destroy(); } void nsJSContext::Destroy() { if (mGCOnDestruction && !recordreplay::IsRecordingOrReplaying()) { PokeGC(JS::gcreason::NSJSCONTEXT_DESTROY, mWindowProxy); } DropJSObjects(this); } // QueryInterface implementation for nsJSContext NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSContext) NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSContext) NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mWindowProxy) NS_IMPL_CYCLE_COLLECTION_TRACE_END NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSContext) tmp->mIsInitialized = false; tmp->mGCOnDestruction = false; tmp->mWindowProxy = nullptr; tmp->Destroy(); NS_IMPL_CYCLE_COLLECTION_UNLINK(mGlobalObjectRef) NS_IMPL_CYCLE_COLLECTION_UNLINK_END NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsJSContext) NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGlobalObjectRef) NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSContext) NS_INTERFACE_MAP_ENTRY(nsIScriptContext) NS_INTERFACE_MAP_ENTRY(nsISupports) NS_INTERFACE_MAP_END NS_IMPL_CYCLE_COLLECTING_ADDREF(nsJSContext) NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSContext) #ifdef DEBUG bool AtomIsEventHandlerName(nsAtom *aName) { const char16_t *name = aName->GetUTF16String(); const char16_t *cp; char16_t c; for (cp = name; *cp != '\0'; ++cp) { c = *cp; if ((c < 'A' || c > 'Z') && (c < 'a' || c > 'z')) return false; } return true; } #endif nsIScriptGlobalObject * nsJSContext::GetGlobalObject() { // Note: this could probably be simplified somewhat more; see bug 974327 // comments 1 and 3. if (!mWindowProxy) { return nullptr; } MOZ_ASSERT(mGlobalObjectRef); return mGlobalObjectRef; } nsresult nsJSContext::InitContext() { // Make sure callers of this use // WillInitializeContext/DidInitializeContext around this call. NS_ENSURE_TRUE(!mIsInitialized, NS_ERROR_ALREADY_INITIALIZED); // XXXbz Is there still a point to this function? return NS_OK; } nsresult nsJSContext::SetProperty(JS::Handle aTarget, const char* aPropName, nsISupports* aArgs) { AutoJSAPI jsapi; if (NS_WARN_IF(!jsapi.Init(GetGlobalObject()))) { return NS_ERROR_FAILURE; } JSContext* cx = jsapi.cx(); JS::AutoValueVector args(cx); JS::Rooted global(cx, GetWindowProxy()); nsresult rv = ConvertSupportsTojsvals(aArgs, global, args); NS_ENSURE_SUCCESS(rv, rv); // got the arguments, now attach them. for (uint32_t i = 0; i < args.length(); ++i) { if (!JS_WrapValue(cx, args[i])) { return NS_ERROR_FAILURE; } } JS::Rooted array(cx, ::JS_NewArrayObject(cx, args)); if (!array) { return NS_ERROR_FAILURE; } return JS_DefineProperty(cx, aTarget, aPropName, array, 0) ? NS_OK : NS_ERROR_FAILURE; } nsresult nsJSContext::ConvertSupportsTojsvals(nsISupports* aArgs, JS::Handle aScope, JS::AutoValueVector& aArgsOut) { nsresult rv = NS_OK; // If the array implements nsIJSArgArray, copy the contents and return. nsCOMPtr fastArray = do_QueryInterface(aArgs); if (fastArray) { uint32_t argc; JS::Value* argv; rv = fastArray->GetArgs(&argc, reinterpret_cast(&argv)); if (NS_SUCCEEDED(rv) && !aArgsOut.append(argv, argc)) { rv = NS_ERROR_OUT_OF_MEMORY; } return rv; } // Take the slower path converting each item. // Handle only nsIArray and nsIVariant. nsIArray is only needed for // SetProperty('arguments', ...); nsIXPConnect *xpc = nsContentUtils::XPConnect(); NS_ENSURE_TRUE(xpc, NS_ERROR_UNEXPECTED); AutoJSContext cx; if (!aArgs) return NS_OK; uint32_t argCount; // This general purpose function may need to convert an arg array // (window.arguments, event-handler args) and a generic property. nsCOMPtr argsArray(do_QueryInterface(aArgs)); if (argsArray) { rv = argsArray->GetLength(&argCount); NS_ENSURE_SUCCESS(rv, rv); if (argCount == 0) return NS_OK; } else { argCount = 1; // the nsISupports which is not an array } // Use the caller's auto guards to release and unroot. if (!aArgsOut.resize(argCount)) { return NS_ERROR_OUT_OF_MEMORY; } if (argsArray) { for (uint32_t argCtr = 0; argCtr < argCount && NS_SUCCEEDED(rv); argCtr++) { nsCOMPtr arg; JS::MutableHandle thisVal = aArgsOut[argCtr]; argsArray->QueryElementAt(argCtr, NS_GET_IID(nsISupports), getter_AddRefs(arg)); if (!arg) { thisVal.setNull(); continue; } nsCOMPtr variant(do_QueryInterface(arg)); if (variant != nullptr) { rv = xpc->VariantToJS(cx, aScope, variant, thisVal); } else { // And finally, support the nsISupportsPrimitives supplied // by the AppShell. It generally will pass only strings, but // as we have code for handling all, we may as well use it. rv = AddSupportsPrimitiveTojsvals(arg, thisVal.address()); if (rv == NS_ERROR_NO_INTERFACE) { // something else - probably an event object or similar - // just wrap it. #ifdef DEBUG // but first, check its not another nsISupportsPrimitive, as // these are now deprecated for use with script contexts. nsCOMPtr prim(do_QueryInterface(arg)); NS_ASSERTION(prim == nullptr, "Don't pass nsISupportsPrimitives - use nsIVariant!"); #endif JSAutoRealm ar(cx, aScope); rv = nsContentUtils::WrapNative(cx, arg, thisVal); } } } } else { nsCOMPtr variant = do_QueryInterface(aArgs); if (variant) { rv = xpc->VariantToJS(cx, aScope, variant, aArgsOut[0]); } else { NS_ERROR("Not an array, not an interface?"); rv = NS_ERROR_UNEXPECTED; } } return rv; } // This really should go into xpconnect somewhere... nsresult nsJSContext::AddSupportsPrimitiveTojsvals(nsISupports *aArg, JS::Value *aArgv) { MOZ_ASSERT(aArg, "Empty arg"); nsCOMPtr argPrimitive(do_QueryInterface(aArg)); if (!argPrimitive) return NS_ERROR_NO_INTERFACE; AutoJSContext cx; uint16_t type; argPrimitive->GetType(&type); switch(type) { case nsISupportsPrimitive::TYPE_CSTRING : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); nsAutoCString data; p->GetData(data); JSString *str = ::JS_NewStringCopyN(cx, data.get(), data.Length()); NS_ENSURE_TRUE(str, NS_ERROR_OUT_OF_MEMORY); aArgv->setString(str); break; } case nsISupportsPrimitive::TYPE_STRING : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); nsAutoString data; p->GetData(data); // cast is probably safe since wchar_t and char16_t are expected // to be equivalent; both unsigned 16-bit entities JSString *str = ::JS_NewUCStringCopyN(cx, data.get(), data.Length()); NS_ENSURE_TRUE(str, NS_ERROR_OUT_OF_MEMORY); aArgv->setString(str); break; } case nsISupportsPrimitive::TYPE_PRBOOL : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); bool data; p->GetData(&data); aArgv->setBoolean(data); break; } case nsISupportsPrimitive::TYPE_PRUINT8 : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); uint8_t data; p->GetData(&data); aArgv->setInt32(data); break; } case nsISupportsPrimitive::TYPE_PRUINT16 : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); uint16_t data; p->GetData(&data); aArgv->setInt32(data); break; } case nsISupportsPrimitive::TYPE_PRUINT32 : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); uint32_t data; p->GetData(&data); aArgv->setInt32(data); break; } case nsISupportsPrimitive::TYPE_CHAR : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); char data; p->GetData(&data); JSString *str = ::JS_NewStringCopyN(cx, &data, 1); NS_ENSURE_TRUE(str, NS_ERROR_OUT_OF_MEMORY); aArgv->setString(str); break; } case nsISupportsPrimitive::TYPE_PRINT16 : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); int16_t data; p->GetData(&data); aArgv->setInt32(data); break; } case nsISupportsPrimitive::TYPE_PRINT32 : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); int32_t data; p->GetData(&data); aArgv->setInt32(data); break; } case nsISupportsPrimitive::TYPE_FLOAT : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); float data; p->GetData(&data); *aArgv = ::JS_NumberValue(data); break; } case nsISupportsPrimitive::TYPE_DOUBLE : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); double data; p->GetData(&data); *aArgv = ::JS_NumberValue(data); break; } case nsISupportsPrimitive::TYPE_INTERFACE_POINTER : { nsCOMPtr p(do_QueryInterface(argPrimitive)); NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED); nsCOMPtr data; nsIID *iid = nullptr; p->GetData(getter_AddRefs(data)); p->GetDataIID(&iid); NS_ENSURE_TRUE(iid, NS_ERROR_UNEXPECTED); AutoFree iidGuard(iid); // Free iid upon destruction. JS::Rooted scope(cx, GetWindowProxy()); JS::Rooted v(cx); JSAutoRealm ar(cx, scope); nsresult rv = nsContentUtils::WrapNative(cx, data, iid, &v); NS_ENSURE_SUCCESS(rv, rv); *aArgv = v; break; } case nsISupportsPrimitive::TYPE_ID : case nsISupportsPrimitive::TYPE_PRUINT64 : case nsISupportsPrimitive::TYPE_PRINT64 : case nsISupportsPrimitive::TYPE_PRTIME : { NS_WARNING("Unsupported primitive type used"); aArgv->setNull(); break; } default : { NS_WARNING("Unknown primitive type used"); aArgv->setNull(); break; } } return NS_OK; } #ifdef MOZ_JPROF #include inline bool IsJProfAction(struct sigaction *action) { return (action->sa_sigaction && (action->sa_flags & (SA_RESTART | SA_SIGINFO)) == (SA_RESTART | SA_SIGINFO)); } void NS_JProfStartProfiling(); void NS_JProfStopProfiling(); void NS_JProfClearCircular(); static bool JProfStartProfilingJS(JSContext *cx, unsigned argc, JS::Value *vp) { NS_JProfStartProfiling(); return true; } void NS_JProfStartProfiling() { // Figure out whether we're dealing with SIGPROF, SIGALRM, or // SIGPOLL profiling (SIGALRM for JP_REALTIME, SIGPOLL for // JP_RTC_HZ) struct sigaction action; // Must check ALRM before PROF since both are enabled for real-time sigaction(SIGALRM, nullptr, &action); //printf("SIGALRM: %p, flags = %x\n",action.sa_sigaction,action.sa_flags); if (IsJProfAction(&action)) { //printf("Beginning real-time jprof profiling.\n"); raise(SIGALRM); return; } sigaction(SIGPROF, nullptr, &action); //printf("SIGPROF: %p, flags = %x\n",action.sa_sigaction,action.sa_flags); if (IsJProfAction(&action)) { //printf("Beginning process-time jprof profiling.\n"); raise(SIGPROF); return; } sigaction(SIGPOLL, nullptr, &action); //printf("SIGPOLL: %p, flags = %x\n",action.sa_sigaction,action.sa_flags); if (IsJProfAction(&action)) { //printf("Beginning rtc-based jprof profiling.\n"); raise(SIGPOLL); return; } printf("Could not start jprof-profiling since JPROF_FLAGS was not set.\n"); } static bool JProfStopProfilingJS(JSContext *cx, unsigned argc, JS::Value *vp) { NS_JProfStopProfiling(); return true; } void NS_JProfStopProfiling() { raise(SIGUSR1); //printf("Stopped jprof profiling.\n"); } static bool JProfClearCircularJS(JSContext *cx, unsigned argc, JS::Value *vp) { NS_JProfClearCircular(); return true; } void NS_JProfClearCircular() { raise(SIGUSR2); //printf("cleared jprof buffer\n"); } static bool JProfSaveCircularJS(JSContext *cx, unsigned argc, JS::Value *vp) { // Not ideal... NS_JProfStopProfiling(); NS_JProfStartProfiling(); return true; } static const JSFunctionSpec JProfFunctions[] = { JS_FN("JProfStartProfiling", JProfStartProfilingJS, 0, 0), JS_FN("JProfStopProfiling", JProfStopProfilingJS, 0, 0), JS_FN("JProfClearCircular", JProfClearCircularJS, 0, 0), JS_FN("JProfSaveCircular", JProfSaveCircularJS, 0, 0), JS_FS_END }; #endif /* defined(MOZ_JPROF) */ nsresult nsJSContext::InitClasses(JS::Handle aGlobalObj) { AutoJSAPI jsapi; jsapi.Init(); JSContext* cx = jsapi.cx(); JSAutoRealm ar(cx, aGlobalObj); // Attempt to initialize profiling functions ::JS_DefineProfilingFunctions(cx, aGlobalObj); #ifdef MOZ_JPROF // Attempt to initialize JProf functions ::JS_DefineFunctions(cx, aGlobalObj, JProfFunctions); #endif return NS_OK; } void nsJSContext::WillInitializeContext() { mIsInitialized = false; } void nsJSContext::DidInitializeContext() { mIsInitialized = true; } bool nsJSContext::IsContextInitialized() { return mIsInitialized; } bool nsJSContext::GetProcessingScriptTag() { return mProcessingScriptTag; } void nsJSContext::SetProcessingScriptTag(bool aFlag) { mProcessingScriptTag = aFlag; } void FullGCTimerFired(nsITimer* aTimer, void* aClosure) { nsJSContext::KillFullGCTimer(); MOZ_ASSERT(!aClosure, "Don't pass a closure to FullGCTimerFired"); nsJSContext::GarbageCollectNow(JS::gcreason::FULL_GC_TIMER, nsJSContext::IncrementalGC); } //static void nsJSContext::GarbageCollectNow(JS::gcreason::Reason aReason, IsIncremental aIncremental, IsShrinking aShrinking, int64_t aSliceMillis) { AUTO_PROFILER_LABEL_DYNAMIC_CSTR("nsJSContext::GarbageCollectNow", GCCC, JS::gcreason::ExplainReason(aReason)); MOZ_ASSERT_IF(aSliceMillis, aIncremental == IncrementalGC); KillGCTimer(); // Reset sPendingLoadCount in case the timer that fired was a // timer we scheduled due to a normal GC timer firing while // documents were loading. If this happens we're waiting for a // document that is taking a long time to load, and we effectively // ignore the fact that the currently loading documents are still // loading and move on as if they weren't. sPendingLoadCount = 0; sLoadingInProgress = false; // We use danger::GetJSContext() since AutoJSAPI will assert if the current // thread's context is null (such as during shutdown). JSContext* cx = danger::GetJSContext(); if (!nsContentUtils::XPConnect() || !cx) { return; } if (sCCLockedOut && aIncremental == IncrementalGC) { // We're in the middle of incremental GC. Do another slice. JS::PrepareForIncrementalGC(cx); JS::IncrementalGCSlice(cx, aReason, aSliceMillis); return; } JSGCInvocationKind gckind = aShrinking == ShrinkingGC ? GC_SHRINK : GC_NORMAL; if (aIncremental == NonIncrementalGC || aReason == JS::gcreason::FULL_GC_TIMER) { sNeedsFullGC = true; } if (sNeedsFullGC) { JS::PrepareForFullGC(cx); } else { CycleCollectedJSRuntime::Get()->PrepareWaitingZonesForGC(); } if (aIncremental == IncrementalGC) { JS::StartIncrementalGC(cx, gckind, aReason, aSliceMillis); } else { JS::NonIncrementalGC(cx, gckind, aReason); } } static void FinishAnyIncrementalGC() { AUTO_PROFILER_LABEL("FinishAnyIncrementalGC", GCCC); if (sCCLockedOut) { AutoJSAPI jsapi; jsapi.Init(); // We're in the middle of an incremental GC, so finish it. JS::PrepareForIncrementalGC(jsapi.cx()); JS::FinishIncrementalGC(jsapi.cx(), JS::gcreason::CC_FORCED); } } static void FireForgetSkippable(uint32_t aSuspected, bool aRemoveChildless, TimeStamp aDeadline) { AUTO_PROFILER_TRACING("CC", aDeadline.IsNull() ? "ForgetSkippable" : "IdleForgetSkippable"); PRTime startTime = PR_Now(); TimeStamp startTimeStamp = TimeStamp::Now(); FinishAnyIncrementalGC(); bool earlyForgetSkippable = sCleanupsSinceLastGC < NS_MAJOR_FORGET_SKIPPABLE_CALLS; int64_t budgetMs = aDeadline.IsNull() ? kForgetSkippableSliceDuration : int64_t((aDeadline - TimeStamp::Now()).ToMilliseconds()); js::SliceBudget budget = js::SliceBudget(js::TimeBudget(budgetMs)); nsCycleCollector_forgetSkippable(budget, aRemoveChildless, earlyForgetSkippable); sPreviousSuspectedCount = nsCycleCollector_suspectedCount(); ++sCleanupsSinceLastGC; PRTime delta = PR_Now() - startTime; if (sMinForgetSkippableTime > delta) { sMinForgetSkippableTime = delta; } if (sMaxForgetSkippableTime < delta) { sMaxForgetSkippableTime = delta; } sTotalForgetSkippableTime += delta; sRemovedPurples += (aSuspected - sPreviousSuspectedCount); ++sForgetSkippableBeforeCC; TimeStamp now = TimeStamp::Now(); TimeDuration duration = now - startTimeStamp; if (duration.ToSeconds()) { TimeDuration idleDuration; if (!aDeadline.IsNull()) { if (aDeadline < now) { // This slice overflowed the idle period. if (aDeadline > startTimeStamp) { idleDuration = aDeadline - startTimeStamp; } } else { idleDuration = duration; } } uint32_t percent = uint32_t(idleDuration.ToSeconds() / duration.ToSeconds() * 100); Telemetry::Accumulate(Telemetry::FORGET_SKIPPABLE_DURING_IDLE, percent); } } MOZ_ALWAYS_INLINE static uint32_t TimeBetween(TimeStamp start, TimeStamp end) { MOZ_ASSERT(end >= start); return (uint32_t) ((end - start).ToMilliseconds()); } static uint32_t TimeUntilNow(TimeStamp start) { if (start.IsNull()) { return 0; } return TimeBetween(start, TimeStamp::Now()); } struct CycleCollectorStats { constexpr CycleCollectorStats() : mMaxGCDuration(0), mRanSyncForgetSkippable(false), mSuspected(0), mMaxSkippableDuration(0), mMaxSliceTime(0), mMaxSliceTimeSinceClear(0), mTotalSliceTime(0), mAnyLockedOut(false), mFile(nullptr) {} void Init() { Clear(); mMaxSliceTimeSinceClear = 0; char* env = getenv("MOZ_CCTIMER"); if (!env) { return; } if (strcmp(env, "none") == 0) { mFile = nullptr; } else if (strcmp(env, "stdout") == 0) { mFile = stdout; } else if (strcmp(env, "stderr") == 0) { mFile = stderr; } else { mFile = fopen(env, "a"); if (!mFile) { MOZ_CRASH("Failed to open MOZ_CCTIMER log file."); } } } void Clear() { if (mFile && mFile != stdout && mFile != stderr) { fclose(mFile); } mBeginSliceTime = TimeStamp(); mEndSliceTime = TimeStamp(); mBeginTime = TimeStamp(); mMaxGCDuration = 0; mRanSyncForgetSkippable = false; mSuspected = 0; mMaxSkippableDuration = 0; mMaxSliceTime = 0; mTotalSliceTime = 0; mAnyLockedOut = false; } void PrepareForCycleCollectionSlice(TimeStamp aDeadline = TimeStamp()); void FinishCycleCollectionSlice() { if (mBeginSliceTime.IsNull()) { // We already called this method from EndCycleCollectionCallback for this slice. return; } mEndSliceTime = TimeStamp::Now(); TimeDuration duration = mEndSliceTime - mBeginSliceTime; if (duration.ToSeconds()) { TimeDuration idleDuration; if (!mIdleDeadline.IsNull()) { if (mIdleDeadline < mEndSliceTime) { // This slice overflowed the idle period. idleDuration = mIdleDeadline - mBeginSliceTime; } else { idleDuration = duration; } } uint32_t percent = uint32_t(idleDuration.ToSeconds() / duration.ToSeconds() * 100); Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_SLICE_DURING_IDLE, percent); } uint32_t sliceTime = TimeBetween(mBeginSliceTime, mEndSliceTime); mMaxSliceTime = std::max(mMaxSliceTime, sliceTime); mMaxSliceTimeSinceClear = std::max(mMaxSliceTimeSinceClear, sliceTime); mTotalSliceTime += sliceTime; mBeginSliceTime = TimeStamp(); } void RunForgetSkippable(); // Time the current slice began, including any GC finishing. TimeStamp mBeginSliceTime; // Time the previous slice of the current CC ended. TimeStamp mEndSliceTime; // Time the current cycle collection began. TimeStamp mBeginTime; // The longest GC finishing duration for any slice of the current CC. uint32_t mMaxGCDuration; // True if we ran sync forget skippable in any slice of the current CC. bool mRanSyncForgetSkippable; // Number of suspected objects at the start of the current CC. uint32_t mSuspected; // The longest duration spent on sync forget skippable in any slice of the // current CC. uint32_t mMaxSkippableDuration; // The longest pause of any slice in the current CC. uint32_t mMaxSliceTime; // The longest slice time since ClearMaxCCSliceTime() was called. uint32_t mMaxSliceTimeSinceClear; // The total amount of time spent actually running the current CC. uint32_t mTotalSliceTime; // True if we were locked out by the GC in any slice of the current CC. bool mAnyLockedOut; // A file to dump CC activity to; set by MOZ_CCTIMER environment variable. FILE* mFile; // In case CC slice was triggered during idle time, set to the end of the idle // period. TimeStamp mIdleDeadline; }; CycleCollectorStats gCCStats; void CycleCollectorStats::PrepareForCycleCollectionSlice(TimeStamp aDeadline) { mBeginSliceTime = TimeStamp::Now(); mIdleDeadline = aDeadline; // Before we begin the cycle collection, make sure there is no active GC. if (sCCLockedOut) { mAnyLockedOut = true; FinishAnyIncrementalGC(); uint32_t gcTime = TimeBetween(mBeginSliceTime, TimeStamp::Now()); mMaxGCDuration = std::max(mMaxGCDuration, gcTime); } } void CycleCollectorStats::RunForgetSkippable() { // Run forgetSkippable synchronously to reduce the size of the CC graph. This // is particularly useful if we recently finished a GC. TimeStamp beginForgetSkippable = TimeStamp::Now(); bool ranSyncForgetSkippable = false; while (sCleanupsSinceLastGC < NS_MAJOR_FORGET_SKIPPABLE_CALLS) { FireForgetSkippable(nsCycleCollector_suspectedCount(), false, TimeStamp()); ranSyncForgetSkippable = true; } if (ranSyncForgetSkippable) { mMaxSkippableDuration = std::max(mMaxSkippableDuration, TimeUntilNow(beginForgetSkippable)); mRanSyncForgetSkippable = true; } } //static void nsJSContext::CycleCollectNow(nsICycleCollectorListener *aListener) { if (!NS_IsMainThread()) { return; } AUTO_PROFILER_LABEL("nsJSContext::CycleCollectNow", GCCC); gCCStats.PrepareForCycleCollectionSlice(TimeStamp()); nsCycleCollector_collect(aListener); gCCStats.FinishCycleCollectionSlice(); } //static void nsJSContext::RunCycleCollectorSlice(TimeStamp aDeadline) { if (!NS_IsMainThread()) { return; } AUTO_PROFILER_TRACING("CC", aDeadline.IsNull() ? "CCSlice" : "IdleCCSlice"); AUTO_PROFILER_LABEL("nsJSContext::RunCycleCollectorSlice", GCCC); gCCStats.PrepareForCycleCollectionSlice(aDeadline); // Decide how long we want to budget for this slice. By default, // use an unlimited budget. js::SliceBudget budget = js::SliceBudget::unlimited(); if (sIncrementalCC) { int64_t baseBudget = kICCSliceBudget; if (!aDeadline.IsNull()) { baseBudget = int64_t((aDeadline - TimeStamp::Now()).ToMilliseconds()); } if (gCCStats.mBeginTime.IsNull()) { // If no CC is in progress, use the standard slice time. budget = js::SliceBudget(js::TimeBudget(baseBudget)); } else { TimeStamp now = TimeStamp::Now(); // Only run a limited slice if we're within the max running time. uint32_t runningTime = TimeBetween(gCCStats.mBeginTime, now); if (runningTime < kMaxICCDuration) { const float maxSlice = MainThreadIdlePeriod::GetLongIdlePeriod(); // Try to make up for a delay in running this slice. float sliceDelayMultiplier = TimeBetween(gCCStats.mEndSliceTime, now) / (float)kICCIntersliceDelay; float delaySliceBudget = std::min(baseBudget * sliceDelayMultiplier, maxSlice); // Increase slice budgets up to |maxSlice| as we approach // half way through the ICC, to avoid large sync CCs. float percentToHalfDone = std::min(2.0f * runningTime / kMaxICCDuration, 1.0f); float laterSliceBudget = maxSlice * percentToHalfDone; budget = js::SliceBudget(js::TimeBudget(std::max({delaySliceBudget, laterSliceBudget, (float)baseBudget}))); } } } nsCycleCollector_collectSlice(budget, aDeadline.IsNull() || (aDeadline - TimeStamp::Now()).ToMilliseconds() < kICCSliceBudget); gCCStats.FinishCycleCollectionSlice(); } //static void nsJSContext::RunCycleCollectorWorkSlice(int64_t aWorkBudget) { if (!NS_IsMainThread()) { return; } AUTO_PROFILER_LABEL("nsJSContext::RunCycleCollectorWorkSlice", GCCC); gCCStats.PrepareForCycleCollectionSlice(); js::SliceBudget budget = js::SliceBudget(js::WorkBudget(aWorkBudget)); nsCycleCollector_collectSlice(budget); gCCStats.FinishCycleCollectionSlice(); } void nsJSContext::ClearMaxCCSliceTime() { gCCStats.mMaxSliceTimeSinceClear = 0; } uint32_t nsJSContext::GetMaxCCSliceTimeSinceClear() { return gCCStats.mMaxSliceTimeSinceClear; } static bool ICCRunnerFired(TimeStamp aDeadline) { if (sDidShutdown) { return false; } // Ignore ICC timer fires during IGC. Running ICC during an IGC will cause us // to synchronously finish the GC, which is bad. if (sCCLockedOut) { PRTime now = PR_Now(); if (sCCLockedOutTime == 0) { sCCLockedOutTime = now; return false; } if (now - sCCLockedOutTime < NS_MAX_CC_LOCKEDOUT_TIME) { return false; } } nsJSContext::RunCycleCollectorSlice(aDeadline); return true; } // Whether to skip the generation of timers for future GC/CC activity. static bool SkipCollectionTimers() { return sShuttingDown || recordreplay::IsRecordingOrReplaying(); } //static void nsJSContext::BeginCycleCollectionCallback() { MOZ_ASSERT(NS_IsMainThread()); gCCStats.mBeginTime = gCCStats.mBeginSliceTime.IsNull() ? TimeStamp::Now() : gCCStats.mBeginSliceTime; gCCStats.mSuspected = nsCycleCollector_suspectedCount(); KillCCRunner(); gCCStats.RunForgetSkippable(); MOZ_ASSERT(!sICCRunner, "Tried to create a new ICC timer when one already existed."); if (SkipCollectionTimers()) { return; } // Create an ICC timer even if ICC is globally disabled, because we could be manually triggering // an incremental collection, and we want to be sure to finish it. sICCRunner = IdleTaskRunner::Create(ICCRunnerFired, "BeginCycleCollectionCallback::ICCRunnerFired", kICCIntersliceDelay, kIdleICCSliceBudget, true, []{ return sShuttingDown; }, TaskCategory::GarbageCollection); } static_assert(NS_GC_DELAY > kMaxICCDuration, "A max duration ICC shouldn't reduce GC delay to 0"); //static void nsJSContext::EndCycleCollectionCallback(CycleCollectorResults &aResults) { MOZ_ASSERT(NS_IsMainThread()); nsJSContext::KillICCRunner(); // Update timing information for the current slice before we log it, if // we previously called PrepareForCycleCollectionSlice(). During shutdown // CCs, this won't happen. gCCStats.FinishCycleCollectionSlice(); sCCollectedWaitingForGC += aResults.mFreedGCed; sCCollectedZonesWaitingForGC += aResults.mFreedJSZones; TimeStamp endCCTimeStamp = TimeStamp::Now(); uint32_t ccNowDuration = TimeBetween(gCCStats.mBeginTime, endCCTimeStamp); if (NeedsGCAfterCC()) { PokeGC(JS::gcreason::CC_WAITING, nullptr, NS_GC_DELAY - std::min(ccNowDuration, kMaxICCDuration)); } // Log information about the CC via telemetry, JSON and the console. Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_FINISH_IGC, gCCStats.mAnyLockedOut); Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_SYNC_SKIPPABLE, gCCStats.mRanSyncForgetSkippable); Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_FULL, ccNowDuration); Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_MAX_PAUSE, gCCStats.mMaxSliceTime); if (!sLastCCEndTime.IsNull()) { // TimeBetween returns milliseconds, but we want to report seconds. uint32_t timeBetween = TimeBetween(sLastCCEndTime, gCCStats.mBeginTime) / 1000; Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_TIME_BETWEEN, timeBetween); } sLastCCEndTime = endCCTimeStamp; Telemetry::Accumulate(Telemetry::FORGET_SKIPPABLE_MAX, sMaxForgetSkippableTime / PR_USEC_PER_MSEC); PRTime delta = GetCollectionTimeDelta(); uint32_t cleanups = sForgetSkippableBeforeCC ? sForgetSkippableBeforeCC : 1; uint32_t minForgetSkippableTime = (sMinForgetSkippableTime == UINT32_MAX) ? 0 : sMinForgetSkippableTime; if (StaticPrefs::javascript_options_mem_log() || gCCStats.mFile) { nsCString mergeMsg; if (aResults.mMergedZones) { mergeMsg.AssignLiteral(" merged"); } nsCString gcMsg; if (aResults.mForcedGC) { gcMsg.AssignLiteral(", forced a GC"); } const char16_t *kFmt = u"CC(T+%.1f)[%s-%i] max pause: %lums, total time: %lums, slices: %lu, suspected: %lu, visited: %lu RCed and %lu%s GCed, collected: %lu RCed and %lu GCed (%lu|%lu|%lu waiting for GC)%s\n" u"ForgetSkippable %lu times before CC, min: %lu ms, max: %lu ms, avg: %lu ms, total: %lu ms, max sync: %lu ms, removed: %lu"; nsString msg; nsTextFormatter::ssprintf(msg, kFmt, double(delta) / PR_USEC_PER_SEC, ProcessNameForCollectorLog(), getpid(), gCCStats.mMaxSliceTime, gCCStats.mTotalSliceTime, aResults.mNumSlices, gCCStats.mSuspected, aResults.mVisitedRefCounted, aResults.mVisitedGCed, mergeMsg.get(), aResults.mFreedRefCounted, aResults.mFreedGCed, sCCollectedWaitingForGC, sCCollectedZonesWaitingForGC, sLikelyShortLivingObjectsNeedingGC, gcMsg.get(), sForgetSkippableBeforeCC, minForgetSkippableTime / PR_USEC_PER_MSEC, sMaxForgetSkippableTime / PR_USEC_PER_MSEC, (sTotalForgetSkippableTime / cleanups) / PR_USEC_PER_MSEC, sTotalForgetSkippableTime / PR_USEC_PER_MSEC, gCCStats.mMaxSkippableDuration, sRemovedPurples); if (StaticPrefs::javascript_options_mem_log()) { nsCOMPtr cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID); if (cs) { cs->LogStringMessage(msg.get()); } } if (gCCStats.mFile) { fprintf(gCCStats.mFile, "%s\n", NS_ConvertUTF16toUTF8(msg).get()); } } if (StaticPrefs::javascript_options_mem_notify()) { const char16_t* kJSONFmt = u"{ \"timestamp\": %llu, " u"\"duration\": %lu, " u"\"max_slice_pause\": %lu, " u"\"total_slice_pause\": %lu, " u"\"max_finish_gc_duration\": %lu, " u"\"max_sync_skippable_duration\": %lu, " u"\"suspected\": %lu, " u"\"visited\": { " u"\"RCed\": %lu, " u"\"GCed\": %lu }, " u"\"collected\": { " u"\"RCed\": %lu, " u"\"GCed\": %lu }, " u"\"waiting_for_gc\": %lu, " u"\"zones_waiting_for_gc\": %lu, " u"\"short_living_objects_waiting_for_gc\": %lu, " u"\"forced_gc\": %d, " u"\"forget_skippable\": { " u"\"times_before_cc\": %lu, " u"\"min\": %lu, " u"\"max\": %lu, " u"\"avg\": %lu, " u"\"total\": %lu, " u"\"removed\": %lu } " u"}"; nsString json; nsTextFormatter::ssprintf(json, kJSONFmt, PR_Now(), ccNowDuration, gCCStats.mMaxSliceTime, gCCStats.mTotalSliceTime, gCCStats.mMaxGCDuration, gCCStats.mMaxSkippableDuration, gCCStats.mSuspected, aResults.mVisitedRefCounted, aResults.mVisitedGCed, aResults.mFreedRefCounted, aResults.mFreedGCed, sCCollectedWaitingForGC, sCCollectedZonesWaitingForGC, sLikelyShortLivingObjectsNeedingGC, aResults.mForcedGC, sForgetSkippableBeforeCC, minForgetSkippableTime / PR_USEC_PER_MSEC, sMaxForgetSkippableTime / PR_USEC_PER_MSEC, (sTotalForgetSkippableTime / cleanups) / PR_USEC_PER_MSEC, sTotalForgetSkippableTime / PR_USEC_PER_MSEC, sRemovedPurples); nsCOMPtr observerService = mozilla::services::GetObserverService(); if (observerService) { observerService->NotifyObservers(nullptr, "cycle-collection-statistics", json.get()); } } // Update global state to indicate we have just run a cycle collection. sMinForgetSkippableTime = UINT32_MAX; sMaxForgetSkippableTime = 0; sTotalForgetSkippableTime = 0; sRemovedPurples = 0; sForgetSkippableBeforeCC = 0; sNeedsFullCC = false; sNeedsGCAfterCC = false; gCCStats.Clear(); } // static bool InterSliceGCRunnerFired(TimeStamp aDeadline, void* aData) { nsJSContext::KillInterSliceGCRunner(); MOZ_ASSERT(sActiveIntersliceGCBudget > 0); // We use longer budgets when the CC has been locked out but the CC has tried // to run since that means we may have significant amount garbage to collect // and better to GC in several longer slices than in a very long one. int64_t budget = aDeadline.IsNull() ? int64_t(sActiveIntersliceGCBudget * 2) : int64_t((aDeadline - TimeStamp::Now()).ToMilliseconds()); if (sCCLockedOut && sCCLockedOutTime) { int64_t lockedTime = PR_Now() - sCCLockedOutTime; int32_t maxSliceGCBudget = sActiveIntersliceGCBudget * 10; double percentOfLockedTime = std::min((double)lockedTime / NS_MAX_CC_LOCKEDOUT_TIME, 1.0); budget = static_cast( std::max((double)budget, percentOfLockedTime * maxSliceGCBudget)); } TimeStamp startTimeStamp = TimeStamp::Now(); TimeDuration duration = sGCUnnotifiedTotalTime; uintptr_t reason = reinterpret_cast(aData); nsJSContext::GarbageCollectNow(aData ? static_cast(reason) : JS::gcreason::INTER_SLICE_GC, nsJSContext::IncrementalGC, nsJSContext::NonShrinkingGC, budget); sGCUnnotifiedTotalTime = TimeDuration(); TimeStamp now = TimeStamp::Now(); TimeDuration sliceDuration = now - startTimeStamp; duration += sliceDuration; if (duration.ToSeconds()) { TimeDuration idleDuration; if (!aDeadline.IsNull()) { if (aDeadline < now) { // This slice overflowed the idle period. idleDuration = aDeadline - startTimeStamp; } else { // Note, we don't want to use duration here, since it may contain // data also from JS engine triggered GC slices. idleDuration = sliceDuration; } } uint32_t percent = uint32_t(idleDuration.ToSeconds() / duration.ToSeconds() * 100); Telemetry::Accumulate(Telemetry::GC_SLICE_DURING_IDLE, percent); } return true; } // static void GCTimerFired(nsITimer *aTimer, void *aClosure) { nsJSContext::KillGCTimer(); nsJSContext::KillInterSliceGCRunner(); if (SkipCollectionTimers()) { return; } // Now start the actual GC after initial timer has fired. sInterSliceGCRunner = IdleTaskRunner::Create([aClosure](TimeStamp aDeadline) { return InterSliceGCRunnerFired(aDeadline, aClosure); }, "GCTimerFired::InterSliceGCRunnerFired", NS_INTERSLICE_GC_DELAY, sActiveIntersliceGCBudget, false, []{ return sShuttingDown; }, TaskCategory::GarbageCollection); } // static void ShrinkingGCTimerFired(nsITimer* aTimer, void* aClosure) { nsJSContext::KillShrinkingGCTimer(); sIsCompactingOnUserInactive = true; nsJSContext::GarbageCollectNow(JS::gcreason::USER_INACTIVE, nsJSContext::IncrementalGC, nsJSContext::ShrinkingGC); } static bool ShouldTriggerCC(uint32_t aSuspected) { return sNeedsFullCC || aSuspected > NS_CC_PURPLE_LIMIT || (aSuspected > NS_CC_FORCED_PURPLE_LIMIT && TimeUntilNow(sLastCCEndTime) > NS_CC_FORCED); } static bool CCRunnerFired(TimeStamp aDeadline) { if (sDidShutdown) { return false; } static uint32_t ccDelay = NS_CC_DELAY; if (sCCLockedOut) { ccDelay = NS_CC_DELAY / 3; PRTime now = PR_Now(); if (sCCLockedOutTime == 0) { // Reset sCCRunnerFireCount so that we run forgetSkippable // often enough before CC. Because of reduced ccDelay // forgetSkippable will be called just a few times. // NS_MAX_CC_LOCKEDOUT_TIME limit guarantees that we end up calling // forgetSkippable and CycleCollectNow eventually. sCCRunnerFireCount = 0; sCCLockedOutTime = now; return false; } if (now - sCCLockedOutTime < NS_MAX_CC_LOCKEDOUT_TIME) { return false; } } ++sCCRunnerFireCount; bool didDoWork = false; // During early timer fires, we only run forgetSkippable. During the first // late timer fire, we decide if we are going to have a second and final // late timer fire, where we may begin to run the CC. Should run at least one // early timer fire to allow cleanup before the CC. int32_t numEarlyTimerFires = std::max((int32_t)ccDelay / NS_CC_SKIPPABLE_DELAY - 2, 1); bool isLateTimerFire = sCCRunnerFireCount > numEarlyTimerFires; uint32_t suspected = nsCycleCollector_suspectedCount(); if (isLateTimerFire && ShouldTriggerCC(suspected)) { if (sCCRunnerFireCount == numEarlyTimerFires + 1) { FireForgetSkippable(suspected, true, aDeadline); didDoWork = true; if (ShouldTriggerCC(nsCycleCollector_suspectedCount())) { // Our efforts to avoid a CC have failed, so we return to let the // timer fire once more to trigger a CC. if (!aDeadline.IsNull() && TimeStamp::Now() < aDeadline) { // Clear content unbinder before the first CC slice. Element::ClearContentUnbinder(); if (TimeStamp::Now() < aDeadline) { // And trigger deferred deletion too. nsCycleCollector_doDeferredDeletion(); } } return didDoWork; } } else { // We are in the final timer fire and still meet the conditions for // triggering a CC. Let RunCycleCollectorSlice finish the current IGC, if // any because that will allow us to include the GC time in the CC pause. nsJSContext::RunCycleCollectorSlice(aDeadline); didDoWork = true; } } else if (((sPreviousSuspectedCount + 100) <= suspected) || (sCleanupsSinceLastGC < NS_MAJOR_FORGET_SKIPPABLE_CALLS)) { // Only do a forget skippable if there are more than a few new objects // or we're doing the initial forget skippables. FireForgetSkippable(suspected, false, aDeadline); didDoWork = true; } if (isLateTimerFire) { ccDelay = NS_CC_DELAY; // We have either just run the CC or decided we don't want to run the CC // next time, so kill the timer. sPreviousSuspectedCount = 0; nsJSContext::KillCCRunner(); } return didDoWork; } // static uint32_t nsJSContext::CleanupsSinceLastGC() { return sCleanupsSinceLastGC; } // static void nsJSContext::LoadStart() { sLoadingInProgress = true; ++sPendingLoadCount; } // static void nsJSContext::LoadEnd() { if (!sLoadingInProgress) return; // sPendingLoadCount is not a well managed load counter (and doesn't // need to be), so make sure we don't make it wrap backwards here. if (sPendingLoadCount > 0) { --sPendingLoadCount; return; } sLoadingInProgress = false; } // Check all of the various collector timers/runners and see if they are waiting to fire. // This does not check sFullGCTimer, as that's a more expensive collection we run // on a long timer. // static void nsJSContext::RunNextCollectorTimer(JS::gcreason::Reason aReason, mozilla::TimeStamp aDeadline) { if (sShuttingDown) { return; } if (sGCTimer) { GCTimerFired(nullptr, reinterpret_cast(aReason)); return; } nsCOMPtr runnable; if (sInterSliceGCRunner) { sInterSliceGCRunner->SetDeadline(aDeadline); runnable = sInterSliceGCRunner; } else { // Check the CC timers after the GC timers, because the CC timers won't do // anything if a GC is in progress. MOZ_ASSERT(!sCCLockedOut, "Don't check the CC timers if the CC is locked out."); } if (sCCRunner) { sCCRunner->SetDeadline(aDeadline); runnable = sCCRunner; } if (sICCRunner) { sICCRunner->SetDeadline(aDeadline); runnable = sICCRunner; } if (runnable) { runnable->Run(); } } // static void nsJSContext::MaybeRunNextCollectorSlice(nsIDocShell* aDocShell, JS::gcreason::Reason aReason) { if (!aDocShell || !XRE_IsContentProcess()) { return; } nsCOMPtr root; aDocShell->GetSameTypeRootTreeItem(getter_AddRefs(root)); if (root == aDocShell) { // We don't want to run collectors when loading the top level page. return; } nsIDocument* rootDocument = root->GetDocument(); if (!rootDocument || rootDocument->GetReadyStateEnum() != nsIDocument::READYSTATE_COMPLETE || rootDocument->IsInBackgroundWindow()) { return; } nsIPresShell* presShell = rootDocument->GetShell(); if (!presShell) { return; } nsViewManager* vm = presShell->GetViewManager(); if (!vm) { return; } // GetLastUserEventTime returns microseconds. uint32_t lastEventTime = 0; vm->GetLastUserEventTime(lastEventTime); uint32_t currentTime = PR_IntervalToMicroseconds(PR_IntervalNow()); // Only try to trigger collectors more often if user hasn't interacted with // the page for awhile. if ((currentTime - lastEventTime) > (NS_USER_INTERACTION_INTERVAL * PR_USEC_PER_MSEC)) { Maybe next = nsRefreshDriver::GetNextTickHint(); // Try to not delay the next RefreshDriver tick, so give a reasonable // deadline for collectors. if (next.isSome()) { nsJSContext::RunNextCollectorTimer(aReason, next.value()); } } } // static void nsJSContext::PokeGC(JS::gcreason::Reason aReason, JSObject* aObj, int aDelay) { if (sShuttingDown) { return; } if (aObj) { JS::Zone* zone = JS::GetObjectZone(aObj); CycleCollectedJSRuntime::Get()->AddZoneWaitingForGC(zone); } else if (aReason != JS::gcreason::CC_WAITING) { sNeedsFullGC = true; } if (sGCTimer || sInterSliceGCRunner) { // There's already a timer for GC'ing, just return return; } if (sCCRunner) { // Make sure CC is called... sNeedsFullCC = true; // and GC after it. sNeedsGCAfterCC = true; return; } if (sICCRunner) { // Make sure GC is called after the current CC completes. // No need to set sNeedsFullCC because we are currently running a CC. sNeedsGCAfterCC = true; return; } static bool first = true; NS_NewTimerWithFuncCallback(&sGCTimer, GCTimerFired, reinterpret_cast(aReason), aDelay ? aDelay : (first ? NS_FIRST_GC_DELAY : NS_GC_DELAY), nsITimer::TYPE_ONE_SHOT_LOW_PRIORITY, "GCTimerFired", SystemGroup::EventTargetFor(TaskCategory::GarbageCollection)); first = false; } // static void nsJSContext::PokeShrinkingGC() { if (sShrinkingGCTimer || SkipCollectionTimers()) { return; } NS_NewTimerWithFuncCallback(&sShrinkingGCTimer, ShrinkingGCTimerFired, nullptr, StaticPrefs::javascript_options_compact_on_user_inactive_delay(), nsITimer::TYPE_ONE_SHOT_LOW_PRIORITY, "ShrinkingGCTimerFired", SystemGroup::EventTargetFor(TaskCategory::GarbageCollection)); } // static void nsJSContext::MaybePokeCC() { if (sCCRunner || sICCRunner || !sHasRunGC || SkipCollectionTimers()) { return; } uint32_t sinceLastCCEnd = TimeUntilNow(sLastCCEndTime); if (sinceLastCCEnd && sinceLastCCEnd < NS_CC_DELAY) { return; } if (ShouldTriggerCC(nsCycleCollector_suspectedCount())) { sCCRunnerFireCount = 0; // We can kill some objects before running forgetSkippable. nsCycleCollector_dispatchDeferredDeletion(); sCCRunner = IdleTaskRunner::Create(CCRunnerFired, "MaybePokeCC::CCRunnerFired", NS_CC_SKIPPABLE_DELAY, kForgetSkippableSliceDuration, true, []{ return sShuttingDown; }, TaskCategory::GarbageCollection); } } //static void nsJSContext::KillGCTimer() { if (sGCTimer) { sGCTimer->Cancel(); NS_RELEASE(sGCTimer); } } void nsJSContext::KillFullGCTimer() { if (sFullGCTimer) { sFullGCTimer->Cancel(); NS_RELEASE(sFullGCTimer); } } void nsJSContext::KillInterSliceGCRunner() { if (sInterSliceGCRunner) { sInterSliceGCRunner->Cancel(); sInterSliceGCRunner = nullptr; } } //static void nsJSContext::KillShrinkingGCTimer() { if (sShrinkingGCTimer) { sShrinkingGCTimer->Cancel(); NS_RELEASE(sShrinkingGCTimer); } } //static void nsJSContext::KillCCRunner() { sCCLockedOutTime = 0; if (sCCRunner) { sCCRunner->Cancel(); sCCRunner = nullptr; } } //static void nsJSContext::KillICCRunner() { sCCLockedOutTime = 0; if (sICCRunner) { sICCRunner->Cancel(); sICCRunner = nullptr; } } class NotifyGCEndRunnable : public Runnable { nsString mMessage; public: explicit NotifyGCEndRunnable(nsString&& aMessage) : mozilla::Runnable("NotifyGCEndRunnable") , mMessage(std::move(aMessage)) { } NS_DECL_NSIRUNNABLE }; NS_IMETHODIMP NotifyGCEndRunnable::Run() { MOZ_ASSERT(NS_IsMainThread()); nsCOMPtr observerService = mozilla::services::GetObserverService(); if (!observerService) { return NS_OK; } const char16_t oomMsg[3] = { '{', '}', 0 }; const char16_t *toSend = mMessage.get() ? mMessage.get() : oomMsg; observerService->NotifyObservers(nullptr, "garbage-collection-statistics", toSend); return NS_OK; } static void DOMGCSliceCallback(JSContext* aCx, JS::GCProgress aProgress, const JS::GCDescription &aDesc) { NS_ASSERTION(NS_IsMainThread(), "GCs must run on the main thread"); switch (aProgress) { case JS::GC_CYCLE_BEGIN: { // Prevent cycle collections and shrinking during incremental GC. sCCLockedOut = true; break; } case JS::GC_CYCLE_END: { PRTime delta = GetCollectionTimeDelta(); if (StaticPrefs::javascript_options_mem_log()) { nsString gcstats; gcstats.Adopt(aDesc.formatSummaryMessage(aCx)); nsAutoString prefix; nsTextFormatter::ssprintf(prefix, u"GC(T+%.1f)[%s-%i] ", double(delta) / PR_USEC_PER_SEC, ProcessNameForCollectorLog(), getpid()); nsString msg = prefix + gcstats; nsCOMPtr cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID); if (cs) { cs->LogStringMessage(msg.get()); } } if (!sShuttingDown) { if (StaticPrefs::javascript_options_mem_notify() || Telemetry::CanRecordExtended()) { nsString json; json.Adopt(aDesc.formatJSON(aCx, PR_Now())); RefPtr notify = new NotifyGCEndRunnable(std::move(json)); SystemGroup::Dispatch(TaskCategory::GarbageCollection, notify.forget()); } } sCCLockedOut = false; sIsCompactingOnUserInactive = false; // May need to kill the inter-slice GC runner nsJSContext::KillInterSliceGCRunner(); sCCollectedWaitingForGC = 0; sCCollectedZonesWaitingForGC = 0; sLikelyShortLivingObjectsNeedingGC = 0; sCleanupsSinceLastGC = 0; sNeedsFullCC = true; sHasRunGC = true; nsJSContext::MaybePokeCC(); if (aDesc.isZone_) { if (!sFullGCTimer && !SkipCollectionTimers()) { NS_NewTimerWithFuncCallback(&sFullGCTimer, FullGCTimerFired, nullptr, NS_FULL_GC_DELAY, nsITimer::TYPE_ONE_SHOT_LOW_PRIORITY, "FullGCTimerFired", SystemGroup::EventTargetFor(TaskCategory::GarbageCollection)); } } else { nsJSContext::KillFullGCTimer(); } if (!recordreplay::IsRecordingOrReplaying() && ShouldTriggerCC(nsCycleCollector_suspectedCount())) { nsCycleCollector_dispatchDeferredDeletion(); } if (!aDesc.isZone_) { sNeedsFullGC = false; } break; } case JS::GC_SLICE_BEGIN: break; case JS::GC_SLICE_END: sGCUnnotifiedTotalTime += aDesc.lastSliceEnd(aCx) - aDesc.lastSliceStart(aCx); // Schedule another GC slice if the GC has more work to do. nsJSContext::KillInterSliceGCRunner(); if (!SkipCollectionTimers() && !aDesc.isComplete_) { sInterSliceGCRunner = IdleTaskRunner::Create([](TimeStamp aDeadline) { return InterSliceGCRunnerFired(aDeadline, nullptr); }, "DOMGCSliceCallback::InterSliceGCRunnerFired", NS_INTERSLICE_GC_DELAY, sActiveIntersliceGCBudget, false, []{ return sShuttingDown; }, TaskCategory::GarbageCollection); } if (!recordreplay::IsRecordingOrReplaying() && ShouldTriggerCC(nsCycleCollector_suspectedCount())) { nsCycleCollector_dispatchDeferredDeletion(); } if (StaticPrefs::javascript_options_mem_log()) { nsString gcstats; gcstats.Adopt(aDesc.formatSliceMessage(aCx)); nsAutoString prefix; nsTextFormatter::ssprintf(prefix, u"[%s-%i] ", ProcessNameForCollectorLog(), getpid()); nsString msg = prefix + gcstats; nsCOMPtr cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID); if (cs) { cs->LogStringMessage(msg.get()); } } break; default: MOZ_CRASH("Unexpected GCProgress value"); } if (sPrevGCSliceCallback) { (*sPrevGCSliceCallback)(aCx, aProgress, aDesc); } } void nsJSContext::SetWindowProxy(JS::Handle aWindowProxy) { mWindowProxy = aWindowProxy; } JSObject* nsJSContext::GetWindowProxy() { return mWindowProxy; } void nsJSContext::LikelyShortLivingObjectCreated() { ++sLikelyShortLivingObjectsNeedingGC; } void mozilla::dom::StartupJSEnvironment() { // initialize all our statics, so that we can restart XPCOM sGCTimer = sShrinkingGCTimer = sFullGCTimer = nullptr; sCCLockedOut = false; sCCLockedOutTime = 0; sLastCCEndTime = TimeStamp(); sHasRunGC = false; sPendingLoadCount = 0; sLoadingInProgress = false; sCCollectedWaitingForGC = 0; sCCollectedZonesWaitingForGC = 0; sLikelyShortLivingObjectsNeedingGC = 0; sNeedsFullCC = false; sNeedsFullGC = true; sNeedsGCAfterCC = false; sIsInitialized = false; sDidShutdown = false; sShuttingDown = false; gCCStats.Init(); } static void SetGCParameter(JSGCParamKey aParam, uint32_t aValue) { AutoJSAPI jsapi; jsapi.Init(); JS_SetGCParameter(jsapi.cx(), aParam, aValue); } static void ResetGCParameter(JSGCParamKey aParam) { AutoJSAPI jsapi; jsapi.Init(); JS_ResetGCParameter(jsapi.cx(), aParam); } static void SetMemoryPrefChangedCallbackMB(const char* aPrefName, void* aClosure) { int32_t prefMB = Preferences::GetInt(aPrefName, -1); // handle overflow and negative pref values CheckedInt prefB = CheckedInt(prefMB) * 1024 * 1024; if (prefB.isValid() && prefB.value() >= 0) { SetGCParameter((JSGCParamKey)(uintptr_t)aClosure, prefB.value()); } else { ResetGCParameter((JSGCParamKey)(uintptr_t)aClosure); } } static void SetMemoryNurseryMaxPrefChangedCallback(const char* aPrefName, void* aClosure) { int32_t prefMB = Preferences::GetInt(aPrefName, -1); // handle overflow and negative pref values CheckedInt prefB = CheckedInt(prefMB) * 1024; if (prefB.isValid() && prefB.value() >= 0) { SetGCParameter((JSGCParamKey)(uintptr_t)aClosure, prefB.value()); } else { ResetGCParameter((JSGCParamKey)(uintptr_t)aClosure); } } static void SetMemoryPrefChangedCallbackInt(const char* aPrefName, void* aClosure) { int32_t pref = Preferences::GetInt(aPrefName, -1); // handle overflow and negative pref values if (pref >= 0 && pref < 10000) { SetGCParameter((JSGCParamKey)(uintptr_t)aClosure, pref); } else { ResetGCParameter((JSGCParamKey)(uintptr_t)aClosure); } } static void SetMemoryPrefChangedCallbackBool(const char* aPrefName, void* aClosure) { bool pref = Preferences::GetBool(aPrefName); SetGCParameter((JSGCParamKey)(uintptr_t)aClosure, pref); } static void SetMemoryGCModePrefChangedCallback(const char* aPrefName, void* aClosure) { bool enableZoneGC = Preferences::GetBool("javascript.options.mem.gc_per_zone"); bool enableIncrementalGC = Preferences::GetBool("javascript.options.mem.gc_incremental"); JSGCMode mode; if (enableIncrementalGC) { mode = JSGC_MODE_INCREMENTAL; } else if (enableZoneGC) { mode = JSGC_MODE_ZONE; } else { mode = JSGC_MODE_GLOBAL; } SetGCParameter(JSGC_MODE, mode); } static void SetMemoryGCSliceTimePrefChangedCallback(const char* aPrefName, void* aClosure) { int32_t pref = Preferences::GetInt(aPrefName, -1); // handle overflow and negative pref values if (pref > 0 && pref < 100000) { sActiveIntersliceGCBudget = pref; SetGCParameter(JSGC_SLICE_TIME_BUDGET, pref); } else { ResetGCParameter(JSGC_SLICE_TIME_BUDGET); } } static void SetIncrementalCCPrefChangedCallback(const char* aPrefName, void* aClosure) { bool pref = Preferences::GetBool(aPrefName); sIncrementalCC = pref; } static bool AsmJSCacheOpenEntryForRead(JS::Handle aGlobal, const char16_t* aBegin, const char16_t* aLimit, size_t* aSize, const uint8_t** aMemory, intptr_t *aHandle) { nsIPrincipal* principal = nsJSPrincipals::get(JS::GetRealmPrincipals(js::GetNonCCWObjectRealm(aGlobal))); return asmjscache::OpenEntryForRead(principal, aBegin, aLimit, aSize, aMemory, aHandle); } static JS::AsmJSCacheResult AsmJSCacheOpenEntryForWrite(JS::Handle aGlobal, const char16_t* aBegin, const char16_t* aEnd, size_t aSize, uint8_t** aMemory, intptr_t* aHandle) { nsIPrincipal* principal = nsJSPrincipals::get(JS::GetRealmPrincipals(js::GetNonCCWObjectRealm(aGlobal))); return asmjscache::OpenEntryForWrite(principal, aBegin, aEnd, aSize, aMemory, aHandle); } class JSDispatchableRunnable final : public Runnable { ~JSDispatchableRunnable() { MOZ_ASSERT(!mDispatchable); } public: explicit JSDispatchableRunnable(JS::Dispatchable* aDispatchable) : mozilla::Runnable("JSDispatchableRunnable") , mDispatchable(aDispatchable) { MOZ_ASSERT(mDispatchable); } protected: NS_IMETHOD Run() override { MOZ_ASSERT(NS_IsMainThread()); AutoJSAPI jsapi; jsapi.Init(); JS::Dispatchable::MaybeShuttingDown maybeShuttingDown = sShuttingDown ? JS::Dispatchable::ShuttingDown : JS::Dispatchable::NotShuttingDown; mDispatchable->run(jsapi.cx(), maybeShuttingDown); mDispatchable = nullptr; // mDispatchable may delete itself return NS_OK; } private: JS::Dispatchable* mDispatchable; }; static bool DispatchToEventLoop(void* closure, JS::Dispatchable* aDispatchable) { MOZ_ASSERT(!closure); // This callback may execute either on the main thread or a random JS-internal // helper thread. This callback can be called during shutdown so we cannot // simply NS_DispatchToMainThread. Failure during shutdown is expected and // properly handled by the JS engine. nsCOMPtr mainTarget = GetMainThreadEventTarget(); if (!mainTarget) { return false; } RefPtr r = new JSDispatchableRunnable(aDispatchable); MOZ_ALWAYS_SUCCEEDS(mainTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL)); return true; } static bool ConsumeStream(JSContext* aCx, JS::HandleObject aObj, JS::MimeType aMimeType, JS::StreamConsumer* aConsumer) { return FetchUtil::StreamResponseToJS(aCx, aObj, aMimeType, aConsumer, nullptr); } void nsJSContext::EnsureStatics() { if (sIsInitialized) { if (!nsContentUtils::XPConnect()) { MOZ_CRASH(); } return; } // Let's make sure that our main thread is the same as the xpcom main thread. MOZ_ASSERT(NS_IsMainThread()); AutoJSAPI jsapi; jsapi.Init(); sPrevGCSliceCallback = JS::SetGCSliceCallback(jsapi.cx(), DOMGCSliceCallback); // Set up the asm.js cache callbacks static const JS::AsmJSCacheOps asmJSCacheOps = { AsmJSCacheOpenEntryForRead, asmjscache::CloseEntryForRead, AsmJSCacheOpenEntryForWrite, asmjscache::CloseEntryForWrite }; JS::SetAsmJSCacheOps(jsapi.cx(), &asmJSCacheOps); JS::InitDispatchToEventLoop(jsapi.cx(), DispatchToEventLoop, nullptr); JS::InitConsumeStreamCallback(jsapi.cx(), ConsumeStream); // Set these global xpconnect options... Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackMB, "javascript.options.mem.high_water_mark", (void*)JSGC_MAX_MALLOC_BYTES); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackMB, "javascript.options.mem.max", (void*)JSGC_MAX_BYTES); Preferences::RegisterCallbackAndCall(SetMemoryNurseryMaxPrefChangedCallback, "javascript.options.mem.nursery.max_kb", (void*)JSGC_MAX_NURSERY_BYTES); Preferences::RegisterCallbackAndCall(SetMemoryGCModePrefChangedCallback, "javascript.options.mem.gc_per_zone"); Preferences::RegisterCallbackAndCall(SetMemoryGCModePrefChangedCallback, "javascript.options.mem.gc_incremental"); Preferences::RegisterCallbackAndCall(SetMemoryGCSliceTimePrefChangedCallback, "javascript.options.mem.gc_incremental_slice_ms"); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackBool, "javascript.options.mem.gc_compacting", (void *)JSGC_COMPACTING_ENABLED); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_high_frequency_time_limit_ms", (void *)JSGC_HIGH_FREQUENCY_TIME_LIMIT); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackBool, "javascript.options.mem.gc_dynamic_mark_slice", (void *)JSGC_DYNAMIC_MARK_SLICE); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackBool, "javascript.options.mem.gc_dynamic_heap_growth", (void *)JSGC_DYNAMIC_HEAP_GROWTH); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_low_frequency_heap_growth", (void *)JSGC_LOW_FREQUENCY_HEAP_GROWTH); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_high_frequency_heap_growth_min", (void *)JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_high_frequency_heap_growth_max", (void *)JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_high_frequency_low_limit_mb", (void *)JSGC_HIGH_FREQUENCY_LOW_LIMIT); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_high_frequency_high_limit_mb", (void *)JSGC_HIGH_FREQUENCY_HIGH_LIMIT); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_allocation_threshold_mb", (void *)JSGC_ALLOCATION_THRESHOLD); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_allocation_threshold_factor", (void *)JSGC_ALLOCATION_THRESHOLD_FACTOR); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_allocation_threshold_factor_avoid_interrupt", (void *)JSGC_ALLOCATION_THRESHOLD_FACTOR_AVOID_INTERRUPT); Preferences::RegisterCallbackAndCall(SetIncrementalCCPrefChangedCallback, "dom.cycle_collector.incremental"); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_min_empty_chunk_count", (void *)JSGC_MIN_EMPTY_CHUNK_COUNT); Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackInt, "javascript.options.mem.gc_max_empty_chunk_count", (void *)JSGC_MAX_EMPTY_CHUNK_COUNT); nsCOMPtr obs = mozilla::services::GetObserverService(); if (!obs) { MOZ_CRASH(); } nsIObserver* observer = new nsJSEnvironmentObserver(); obs->AddObserver(observer, "memory-pressure", false); obs->AddObserver(observer, "user-interaction-inactive", false); obs->AddObserver(observer, "user-interaction-active", false); obs->AddObserver(observer, "quit-application", false); obs->AddObserver(observer, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false); sIsInitialized = true; } void mozilla::dom::ShutdownJSEnvironment() { KillTimers(); sShuttingDown = true; sDidShutdown = true; } // A fast-array class for JS. This class supports both nsIJSScriptArray and // nsIArray. If it is JS itself providing and consuming this class, all work // can be done via nsIJSScriptArray, and avoid the conversion of elements // to/from nsISupports. // When consumed by non-JS (eg, another script language), conversion is done // on-the-fly. class nsJSArgArray final : public nsIJSArgArray { public: nsJSArgArray(JSContext *aContext, uint32_t argc, const JS::Value* argv, nsresult *prv); // nsISupports NS_DECL_CYCLE_COLLECTING_ISUPPORTS NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSArgArray, nsIJSArgArray) // nsIArray NS_DECL_NSIARRAY // nsIJSArgArray nsresult GetArgs(uint32_t* argc, void** argv) override; void ReleaseJSObjects(); protected: ~nsJSArgArray(); JSContext *mContext; JS::Heap *mArgv; uint32_t mArgc; }; nsJSArgArray::nsJSArgArray(JSContext *aContext, uint32_t argc, const JS::Value* argv, nsresult *prv) : mContext(aContext) , mArgv(nullptr) , mArgc(argc) { // copy the array - we don't know its lifetime, and ours is tied to xpcom // refcounting. if (argc) { mArgv = new (fallible) JS::Heap[argc]; if (!mArgv) { *prv = NS_ERROR_OUT_OF_MEMORY; return; } } // Callers are allowed to pass in a null argv even for argc > 0. They can // then use GetArgs to initialize the values. if (argv) { for (uint32_t i = 0; i < argc; ++i) mArgv[i] = argv[i]; } if (argc > 0) { mozilla::HoldJSObjects(this); } *prv = NS_OK; } nsJSArgArray::~nsJSArgArray() { ReleaseJSObjects(); } void nsJSArgArray::ReleaseJSObjects() { if (mArgv) { delete [] mArgv; } if (mArgc > 0) { mArgc = 0; mozilla::DropJSObjects(this); } } // QueryInterface implementation for nsJSArgArray NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSArgArray) NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSArgArray) tmp->ReleaseJSObjects(); NS_IMPL_CYCLE_COLLECTION_UNLINK_END NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsJSArgArray) NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSArgArray) if (tmp->mArgv) { for (uint32_t i = 0; i < tmp->mArgc; ++i) { NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mArgv[i]) } } NS_IMPL_CYCLE_COLLECTION_TRACE_END NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSArgArray) NS_INTERFACE_MAP_ENTRY(nsIArray) NS_INTERFACE_MAP_ENTRY(nsIJSArgArray) NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIJSArgArray) NS_INTERFACE_MAP_END NS_IMPL_CYCLE_COLLECTING_ADDREF(nsJSArgArray) NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSArgArray) nsresult nsJSArgArray::GetArgs(uint32_t *argc, void **argv) { *argv = (void *)mArgv; *argc = mArgc; return NS_OK; } // nsIArray impl NS_IMETHODIMP nsJSArgArray::GetLength(uint32_t *aLength) { *aLength = mArgc; return NS_OK; } NS_IMETHODIMP nsJSArgArray::QueryElementAt(uint32_t index, const nsIID & uuid, void * *result) { *result = nullptr; if (index >= mArgc) return NS_ERROR_INVALID_ARG; if (uuid.Equals(NS_GET_IID(nsIVariant)) || uuid.Equals(NS_GET_IID(nsISupports))) { // Have to copy a Heap into a Rooted to work with it. JS::Rooted val(mContext, mArgv[index]); return nsContentUtils::XPConnect()->JSToVariant(mContext, val, (nsIVariant **)result); } NS_WARNING("nsJSArgArray only handles nsIVariant"); return NS_ERROR_NO_INTERFACE; } NS_IMETHODIMP nsJSArgArray::IndexOf(uint32_t startIndex, nsISupports *element, uint32_t *_retval) { return NS_ERROR_NOT_IMPLEMENTED; } NS_IMETHODIMP nsJSArgArray::Enumerate(nsISimpleEnumerator **_retval) { return NS_ERROR_NOT_IMPLEMENTED; } // The factory function nsresult NS_CreateJSArgv(JSContext *aContext, uint32_t argc, const JS::Value* argv, nsIJSArgArray **aArray) { nsresult rv; nsCOMPtr ret = new nsJSArgArray(aContext, argc, argv, &rv); if (NS_FAILED(rv)) { return rv; } ret.forget(aArray); return NS_OK; }