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gecko-dev
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gecko-dev/dom/base/nsJSEnvironment.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "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 <process.h>
# define getpid _getpid
#else
# include <unistd.h> // for getpid()
#endif
#include "xpcpublic.h"
#include "jsapi.h"
#include "js/PropertySpec.h"
#include "js/SliceBudget.h"
#include "js/Wrapper.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/PresShell.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/CanvasRenderingContext2DBinding.h"
#include "mozilla/ContentEvents.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "nsCycleCollectionNoteRootCallback.h"
#include "GeckoProfiler.h"
#include "mozilla/IdleTaskRunner.h"
#include "nsIDocShell.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
// In case the cycle collector isn't run at all, we don't want
// forget skippables to run too often. So limit the forget skippable cycle to
// start at earliest 2000 ms after the end of the previous cycle.
#define NS_TIME_BETWEEN_FORGET_SKIPPABLE_CYCLES 2000 // 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<IdleTaskRunner> sCCRunner;
static StaticRefPtr<IdleTaskRunner> sICCRunner;
static nsITimer* sFullGCTimer;
static StaticRefPtr<IdleTaskRunner> sInterSliceGCRunner;
static TimeStamp sLastCCEndTime;
static TimeStamp sLastForgetSkippableCycleEndTime;
static bool sCCLockedOut;
static PRTime sCCLockedOutTime;
static JS::GCSliceCallback sPrevGCSliceCallback;
static bool sHasRunGC;
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> exception;
UNWRAP_OBJECT(DOMException, exceptionObject, exception);
if (!exception) {
// Not a DOM Exception, try XPC Exception.
UNWRAP_OBJECT(Exception, exceptionObject, exception);
if (!exception) {
return;
}
}
nsCOMPtr<nsIStackFrame> 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() {
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<nsPIDOMWindowInner> win(do_QueryInterface(aScriptGlobal));
nsIDocShell* docShell = win ? win->GetDocShell() : nullptr;
if (docShell) {
RefPtr<nsPresContext> presContext = docShell->GetPresContext();
static int32_t errorDepth; // Recursion prevention
++errorDepth;
if (errorDepth < 2) {
// Dispatch() must be synchronous for the recursion block
// (errorDepth) to work.
RefPtr<ErrorEvent> 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<JS::Value> 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<bool> recursionGuard(sHandlingScriptError);
sHandlingScriptError = true;
RefPtr<nsPresContext> presContext = win->GetDocShell()->GetPresContext();
RootedDictionary<ErrorEventInit> 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<ErrorEvent> 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<JSObject*> stack(rootingCx);
JS::Rooted<JSObject*> stackGlobal(rootingCx);
xpc::FindExceptionStackForConsoleReport(win, mError, &stack,
&stackGlobal);
mReport->LogToConsoleWithStack(stack, stackGlobal,
JS::ExceptionTimeWarpTarget(mError));
}
return NS_OK;
}
private:
nsCOMPtr<nsPIDOMWindowInner> mWindow;
RefPtr<xpc::ErrorReport> 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<JS::Value> 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 <typename T>
void PrintWinURI(T* win) {
if (!win) {
printf("No window passed in.\n");
return;
}
nsCOMPtr<Document> 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 <typename T>
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<nsIURI> 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) {
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<JSObject*> aTarget,
const char* aPropName, nsISupports* aArgs) {
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(GetGlobalObject()))) {
return NS_ERROR_FAILURE;
}
JSContext* cx = jsapi.cx();
JS::RootedVector<JS::Value> args(cx);
JS::Rooted<JSObject*> 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<JSObject*> 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<JSObject*> aScope,
JS::MutableHandleVector<JS::Value> aArgsOut) {
nsresult rv = NS_OK;
// If the array implements nsIJSArgArray, copy the contents and return.
nsCOMPtr<nsIJSArgArray> fastArray = do_QueryInterface(aArgs);
if (fastArray) {
uint32_t argc;
JS::Value* argv;
rv = fastArray->GetArgs(&argc, reinterpret_cast<void**>(&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<nsIArray> 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<nsISupports> arg;
JS::MutableHandle<JS::Value> thisVal = aArgsOut[argCtr];
argsArray->QueryElementAt(argCtr, NS_GET_IID(nsISupports),
getter_AddRefs(arg));
if (!arg) {
thisVal.setNull();
continue;
}
nsCOMPtr<nsIVariant> 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<nsISupportsPrimitive> 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<nsIVariant> 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<nsISupportsPrimitive> 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<nsISupportsCString> 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<nsISupportsString> 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<nsISupportsPRBool> 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<nsISupportsPRUint8> 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<nsISupportsPRUint16> 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<nsISupportsPRUint32> 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<nsISupportsChar> 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<nsISupportsPRInt16> 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<nsISupportsPRInt32> 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<nsISupportsFloat> 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<nsISupportsDouble> 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<nsISupportsInterfacePointer> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
nsCOMPtr<nsISupports> 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<JSObject*> scope(cx, GetWindowProxy());
JS::Rooted<JS::Value> 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 <signal.h>
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<JSObject*> 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 aReason,
IsIncremental aIncremental,
IsShrinking aShrinking,
int64_t aSliceMillis) {
AUTO_PROFILER_LABEL_DYNAMIC_CSTR("nsJSContext::GarbageCollectNow", GCCC,
JS::ExplainGCReason(aReason));
MOZ_ASSERT_IF(aSliceMillis, aIncremental == IncrementalGC);
KillGCTimer();
// 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",
GCCC);
PRTime startTime = PR_Now();
TimeStamp startTimeStamp = TimeStamp::Now();
static uint32_t sForgetSkippableCounter = 0;
static TimeStamp sForgetSkippableFrequencyStartTime;
static TimeStamp sLastForgetSkippableEndTime;
static const TimeDuration minute = TimeDuration::FromSeconds(60.0f);
if (sForgetSkippableFrequencyStartTime.IsNull()) {
sForgetSkippableFrequencyStartTime = startTimeStamp;
} else if (startTimeStamp - sForgetSkippableFrequencyStartTime > minute) {
TimeStamp startPlusMinute = sForgetSkippableFrequencyStartTime + minute;
// If we had forget skippables only at the beginning of the interval, we
// still want to use the whole time, minute or more, for frequency
// calculation. sLastForgetSkippableEndTime is needed if forget skippable
// takes enough time to push the interval to be over a minute.
TimeStamp endPoint = startPlusMinute > sLastForgetSkippableEndTime
? startPlusMinute
: sLastForgetSkippableEndTime;
// Duration in minutes.
double duration =
(endPoint - sForgetSkippableFrequencyStartTime).ToSeconds() / 60;
uint32_t frequencyPerMinute = uint32_t(sForgetSkippableCounter / duration);
Telemetry::Accumulate(Telemetry::FORGET_SKIPPABLE_FREQUENCY,
frequencyPerMinute);
sForgetSkippableCounter = 0;
sForgetSkippableFrequencyStartTime = startTimeStamp;
}
++sForgetSkippableCounter;
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();
sLastForgetSkippableEndTime = 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",
GCCC);
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;
}
// 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 (sShuttingDown) {
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, "
u"suspected: %lu, visited: %lu RCed and %lu%s GCed, collected: %lu "
u"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: "
u"%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<nsIConsoleService> 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<nsIObserverService> 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<int64_t>(
std::max((double)budget, percentOfLockedTime * maxSliceGCBudget));
}
TimeStamp startTimeStamp = TimeStamp::Now();
TimeDuration duration = sGCUnnotifiedTotalTime;
uintptr_t reason = reinterpret_cast<uintptr_t>(aData);
nsJSContext::GarbageCollectNow(
aData ? static_cast<JS::GCReason>(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 (sShuttingDown) {
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();
if (!didDoWork) {
sLastForgetSkippableCycleEndTime = TimeStamp::Now();
}
}
return didDoWork;
}
// static
uint32_t nsJSContext::CleanupsSinceLastGC() { return sCleanupsSinceLastGC; }
// 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 aReason,
mozilla::TimeStamp aDeadline) {
if (sShuttingDown) {
return;
}
if (sGCTimer) {
GCTimerFired(nullptr, reinterpret_cast<void*>(aReason));
return;
}
nsCOMPtr<nsIRunnable> 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) {
MOZ_ASSERT(!sICCRunner,
"Shouldn't have both sCCRunner and sICCRunner active at the "
"same time");
sCCRunner->SetDeadline(aDeadline);
runnable = sCCRunner;
} else if (sICCRunner) {
sICCRunner->SetDeadline(aDeadline);
runnable = sICCRunner;
}
}
if (runnable) {
runnable->Run();
}
}
// static
void nsJSContext::MaybeRunNextCollectorSlice(nsIDocShell* aDocShell,
JS::GCReason aReason) {
if (!aDocShell || !XRE_IsContentProcess()) {
return;
}
nsCOMPtr<nsIDocShellTreeItem> root;
aDocShell->GetSameTypeRootTreeItem(getter_AddRefs(root));
if (root == aDocShell) {
// We don't want to run collectors when loading the top level page.
return;
}
Document* rootDocument = root->GetDocument();
if (!rootDocument ||
rootDocument->GetReadyStateEnum() != Document::READYSTATE_COMPLETE ||
rootDocument->IsInBackgroundWindow()) {
return;
}
PresShell* presShell = rootDocument->GetPresShell();
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<TimeStamp> 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 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<void*>(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 || sShuttingDown) {
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 || sShuttingDown) {
return;
}
uint32_t sinceLastCCEnd = TimeUntilNow(sLastCCEndTime);
if (sinceLastCCEnd && sinceLastCCEnd < NS_CC_DELAY) {
return;
}
// If GC hasn't run recently and forget skippable only cycle was run,
// don't start a new cycle too soon.
if (sCleanupsSinceLastGC > NS_MAJOR_FORGET_SKIPPABLE_CALLS) {
uint32_t sinceLastForgetSkippableCycle =
TimeUntilNow(sLastForgetSkippableCycleEndTime);
if (sinceLastForgetSkippableCycle &&
sinceLastForgetSkippableCycle <
NS_TIME_BETWEEN_FORGET_SKIPPABLE_CYCLES) {
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<nsIObserverService> 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<nsIConsoleService> 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.formatJSONTelemetry(aCx, PR_Now()));
RefPtr<NotifyGCEndRunnable> 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 && !sShuttingDown) {
NS_NewTimerWithFuncCallback(
&sFullGCTimer, FullGCTimerFired, nullptr, NS_FULL_GC_DELAY,
nsITimer::TYPE_ONE_SHOT_LOW_PRIORITY, "FullGCTimerFired",
SystemGroup::EventTargetFor(TaskCategory::GarbageCollection));
}
} else {
nsJSContext::KillFullGCTimer();
}
if (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 (!sShuttingDown && !aDesc.isComplete_) {
sInterSliceGCRunner = IdleTaskRunner::Create(
[](TimeStamp aDeadline) {
return InterSliceGCRunnerFired(aDeadline, nullptr);
},
"DOMGCSliceCallback::InterSliceGCRunnerFired",
NS_INTERSLICE_GC_DELAY, sActiveIntersliceGCBudget, false,
[] { return sShuttingDown; }, TaskCategory::GarbageCollection);
}
if (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<nsIConsoleService> 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<JSObject*> 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();
sLastForgetSkippableCycleEndTime = TimeStamp();
sHasRunGC = 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<int32_t> prefB = CheckedInt<int32_t>(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<int32_t> prefB = CheckedInt<int32_t>(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) {
if (enableZoneGC) {
mode = JSGC_MODE_ZONE_INCREMENTAL;
} else {
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;
}
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<nsIEventTarget> mainTarget = GetMainThreadEventTarget();
if (!mainTarget) {
return false;
}
RefPtr<JSDispatchableRunnable> 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);
JS::InitDispatchToEventLoop(jsapi.cx(), DispatchToEventLoop, nullptr);
JS::InitConsumeStreamCallback(jsapi.cx(), ConsumeStream,
FetchUtil::ReportJSStreamError);
// 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<nsIObserverService> 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<JS::Value>* 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<JS::Value>[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<JS::Value> 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::ScriptedEnumerate(const nsIID& aElemIID,
uint8_t aArgc,
nsISimpleEnumerator** aResult) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsJSArgArray::EnumerateImpl(const nsID& aEntryIID,
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<nsIJSArgArray> ret = new nsJSArgArray(aContext, argc, argv, &rv);
if (NS_FAILED(rv)) {
return rv;
}
ret.forget(aArray);
return NS_OK;
}
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