зеркало из https://github.com/mozilla/gecko-dev.git
2958 строки
86 KiB
C++
2958 строки
86 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsError.h"
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#include "nsJSEnvironment.h"
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#include "nsIScriptGlobalObject.h"
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#include "nsIScriptObjectPrincipal.h"
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#include "nsIDOMChromeWindow.h"
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#include "nsPIDOMWindow.h"
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#include "nsIScriptSecurityManager.h"
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#include "nsDOMCID.h"
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#include "nsIServiceManager.h"
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#include "nsIXPConnect.h"
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#include "nsCOMPtr.h"
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#include "nsISupportsPrimitives.h"
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#include "nsReadableUtils.h"
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#include "nsDOMJSUtils.h"
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#include "nsJSUtils.h"
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#include "nsIDocShell.h"
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#include "nsIDocShellTreeItem.h"
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#include "nsPresContext.h"
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#include "nsIConsoleService.h"
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#include "nsIScriptError.h"
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#include "nsIInterfaceRequestor.h"
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#include "nsIInterfaceRequestorUtils.h"
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#include "nsIPrompt.h"
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#include "nsIObserverService.h"
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#include "nsITimer.h"
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#include "nsAtom.h"
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#include "nsContentUtils.h"
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#include "mozilla/EventDispatcher.h"
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#include "nsIContent.h"
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#include "nsCycleCollector.h"
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#include "nsXPCOMCIDInternal.h"
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#include "nsIXULRuntime.h"
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#include "nsTextFormatter.h"
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#ifdef XP_WIN
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#include <process.h>
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#define getpid _getpid
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#else
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#include <unistd.h> // for getpid()
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#endif
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#include "xpcpublic.h"
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#include "jsapi.h"
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#include "js/Wrapper.h"
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#include "js/SliceBudget.h"
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#include "nsIArray.h"
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#include "nsIObjectInputStream.h"
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#include "nsIObjectOutputStream.h"
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#include "WrapperFactory.h"
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#include "nsGlobalWindow.h"
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#include "mozilla/AutoRestore.h"
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#include "mozilla/MainThreadIdlePeriod.h"
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#include "mozilla/StaticPrefs.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/dom/DOMException.h"
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#include "mozilla/dom/DOMExceptionBinding.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/ErrorEvent.h"
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#include "mozilla/dom/FetchUtil.h"
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#include "mozilla/dom/ScriptSettings.h"
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#include "mozilla/CycleCollectedJSRuntime.h"
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#include "mozilla/SystemGroup.h"
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#include "nsRefreshDriver.h"
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#include "nsJSPrincipals.h"
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#ifdef XP_MACOSX
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// AssertMacros.h defines 'check' and conflicts with AccessCheck.h
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#undef check
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#endif
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#include "AccessCheck.h"
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#include "mozilla/Logging.h"
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#include "prthread.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/Telemetry.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/dom/asmjscache/AsmJSCache.h"
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#include "mozilla/dom/CanvasRenderingContext2DBinding.h"
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#include "mozilla/ContentEvents.h"
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#include "mozilla/CycleCollectedJSContext.h"
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#include "nsCycleCollectionNoteRootCallback.h"
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#include "GeckoProfiler.h"
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#include "mozilla/IdleTaskRunner.h"
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#include "nsIDocShell.h"
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#include "nsIPresShell.h"
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#include "nsViewManager.h"
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#include "mozilla/EventStateManager.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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const size_t gStackSize = 8192;
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// Thank you Microsoft!
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#ifdef CompareString
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#undef CompareString
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#endif
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#define NS_SHRINK_GC_BUFFERS_DELAY 4000 // ms
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// The amount of time we wait from the first request to GC to actually
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// doing the first GC.
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#define NS_FIRST_GC_DELAY 10000 // ms
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#define NS_FULL_GC_DELAY 60000 // ms
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// Maximum amount of time that should elapse between incremental GC slices
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#define NS_INTERSLICE_GC_DELAY 100 // ms
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// The amount of time we wait between a request to CC (after GC ran)
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// and doing the actual CC.
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#define NS_CC_DELAY 6000 // ms
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#define NS_CC_SKIPPABLE_DELAY 250 // ms
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// ForgetSkippable is usually fast, so we can use small budgets.
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// This isn't a real budget but a hint to IdleTaskRunner whether there
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// is enough time to call ForgetSkippable.
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static const int64_t kForgetSkippableSliceDuration = 2;
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// Maximum amount of time that should elapse between incremental CC slices
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static const int64_t kICCIntersliceDelay = 64; // ms
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// Time budget for an incremental CC slice when using timer to run it.
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static const int64_t kICCSliceBudget = 3; // ms
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// Minimum budget for an incremental CC slice when using idle time to run it.
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static const int64_t kIdleICCSliceBudget = 2; // ms
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// Maximum total duration for an ICC
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static const uint32_t kMaxICCDuration = 2000; // ms
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// Force a CC after this long if there's more than NS_CC_FORCED_PURPLE_LIMIT
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// objects in the purple buffer.
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#define NS_CC_FORCED (2 * 60 * PR_USEC_PER_SEC) // 2 min
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#define NS_CC_FORCED_PURPLE_LIMIT 10
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// Don't allow an incremental GC to lock out the CC for too long.
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#define NS_MAX_CC_LOCKEDOUT_TIME (30 * PR_USEC_PER_SEC) // 30 seconds
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// Trigger a CC if the purple buffer exceeds this size when we check it.
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#define NS_CC_PURPLE_LIMIT 200
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// Large value used to specify that a script should run essentially forever
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#define NS_UNLIMITED_SCRIPT_RUNTIME (0x40000000LL << 32)
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// if you add statics here, add them to the list in StartupJSEnvironment
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static nsITimer *sGCTimer;
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static nsITimer *sShrinkingGCTimer;
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static StaticRefPtr<IdleTaskRunner> sCCRunner;
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static StaticRefPtr<IdleTaskRunner> sICCRunner;
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static nsITimer *sFullGCTimer;
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static StaticRefPtr<IdleTaskRunner> sInterSliceGCRunner;
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static TimeStamp sLastCCEndTime;
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static bool sCCLockedOut;
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static PRTime sCCLockedOutTime;
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static JS::GCSliceCallback sPrevGCSliceCallback;
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static bool sHasRunGC;
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// The number of currently pending document loads. This count isn't
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// guaranteed to always reflect reality and can't easily as we don't
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// have an easy place to know when a load ends or is interrupted in
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// all cases. This counter also gets reset if we end up GC'ing while
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// we're waiting for a slow page to load. IOW, this count may be 0
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// even when there are pending loads.
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static uint32_t sPendingLoadCount;
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static bool sLoadingInProgress;
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static uint32_t sCCollectedWaitingForGC;
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static uint32_t sCCollectedZonesWaitingForGC;
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static uint32_t sLikelyShortLivingObjectsNeedingGC;
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static int32_t sCCRunnerFireCount = 0;
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static uint32_t sMinForgetSkippableTime = UINT32_MAX;
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static uint32_t sMaxForgetSkippableTime = 0;
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static uint32_t sTotalForgetSkippableTime = 0;
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static uint32_t sRemovedPurples = 0;
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static uint32_t sForgetSkippableBeforeCC = 0;
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static uint32_t sPreviousSuspectedCount = 0;
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static uint32_t sCleanupsSinceLastGC = UINT32_MAX;
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static bool sNeedsFullCC = false;
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static bool sNeedsFullGC = false;
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static bool sNeedsGCAfterCC = false;
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static bool sIncrementalCC = false;
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static int32_t sActiveIntersliceGCBudget = 5; // ms;
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static PRTime sFirstCollectionTime;
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static bool sIsInitialized;
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static bool sDidShutdown;
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static bool sShuttingDown;
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// nsJSEnvironmentObserver observes the user-interaction-inactive notifications
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// and triggers a shrinking a garbage collection if the user is still inactive
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// after NS_SHRINKING_GC_DELAY ms later, if the appropriate pref is set.
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static bool sIsCompactingOnUserInactive = false;
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static TimeDuration sGCUnnotifiedTotalTime;
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static const char*
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ProcessNameForCollectorLog()
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{
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return XRE_GetProcessType() == GeckoProcessType_Default ?
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"default" : "content";
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}
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namespace xpc {
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// This handles JS Exceptions (via ExceptionStackOrNull), as well as DOM and XPC
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// Exceptions.
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//
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// Note that the returned stackObj and stackGlobal are _not_ wrapped into the
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// compartment of exceptionValue.
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void
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FindExceptionStackForConsoleReport(nsPIDOMWindowInner* win,
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JS::HandleValue exceptionValue,
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JS::MutableHandleObject stackObj,
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JS::MutableHandleObject stackGlobal)
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{
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stackObj.set(nullptr);
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stackGlobal.set(nullptr);
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if (!exceptionValue.isObject()) {
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return;
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}
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if (win && win->AsGlobal()->IsDying()) {
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// Pretend like we have no stack, so we don't end up keeping the global
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// alive via the stack.
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return;
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}
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JS::RootingContext* rcx = RootingCx();
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JS::RootedObject exceptionObject(rcx, &exceptionValue.toObject());
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if (JSObject* excStack = JS::ExceptionStackOrNull(exceptionObject)) {
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// At this point we know exceptionObject is a possibly-wrapped
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// js::ErrorObject that has excStack as stack. excStack might also be a CCW,
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// but excStack must be same-compartment with the unwrapped ErrorObject.
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// Return the ErrorObject's global as stackGlobal. This matches what we do
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// in the ErrorObject's |.stack| getter and ensures stackObj and stackGlobal
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// are same-compartment.
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JSObject* unwrappedException = js::UncheckedUnwrap(exceptionObject);
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stackObj.set(excStack);
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stackGlobal.set(JS::GetNonCCWObjectGlobal(unwrappedException));
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return;
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}
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// It is not a JS Exception, try DOM Exception.
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RefPtr<Exception> exception;
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UNWRAP_OBJECT(DOMException, exceptionObject, exception);
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if (!exception) {
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// Not a DOM Exception, try XPC Exception.
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UNWRAP_OBJECT(Exception, exceptionObject, exception);
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if (!exception) {
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return;
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}
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}
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nsCOMPtr<nsIStackFrame> stack = exception->GetLocation();
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if (!stack) {
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return;
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}
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JS::RootedValue value(rcx);
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stack->GetNativeSavedFrame(&value);
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if (value.isObject()) {
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stackObj.set(&value.toObject());
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MOZ_ASSERT(JS::IsUnwrappedSavedFrame(stackObj));
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stackGlobal.set(JS::GetNonCCWObjectGlobal(stackObj));
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return;
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}
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}
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} /* namespace xpc */
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static PRTime
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GetCollectionTimeDelta()
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{
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PRTime now = PR_Now();
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if (sFirstCollectionTime) {
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return now - sFirstCollectionTime;
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}
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sFirstCollectionTime = now;
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return 0;
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}
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static void
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KillTimers()
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{
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nsJSContext::KillGCTimer();
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nsJSContext::KillShrinkingGCTimer();
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nsJSContext::KillCCRunner();
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nsJSContext::KillICCRunner();
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nsJSContext::KillFullGCTimer();
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nsJSContext::KillInterSliceGCRunner();
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}
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// If we collected a substantial amount of cycles, poke the GC since more objects
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// might be unreachable now.
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static bool
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NeedsGCAfterCC()
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{
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return sCCollectedWaitingForGC > 250 ||
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sCCollectedZonesWaitingForGC > 0 ||
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sLikelyShortLivingObjectsNeedingGC > 2500 ||
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sNeedsGCAfterCC;
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}
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class nsJSEnvironmentObserver final : public nsIObserver
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{
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~nsJSEnvironmentObserver() {}
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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};
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NS_IMPL_ISUPPORTS(nsJSEnvironmentObserver, nsIObserver)
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NS_IMETHODIMP
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nsJSEnvironmentObserver::Observe(nsISupports* aSubject, const char* aTopic,
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const char16_t* aData)
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{
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if (!nsCRT::strcmp(aTopic, "memory-pressure")) {
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if (StaticPrefs::javascript_options_gc_on_memory_pressure()) {
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if (StringBeginsWith(nsDependentString(aData),
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NS_LITERAL_STRING("low-memory-ongoing"))) {
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// Don't GC/CC if we are in an ongoing low-memory state since its very
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// slow and it likely won't help us anyway.
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return NS_OK;
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}
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nsJSContext::GarbageCollectNow(JS::gcreason::MEM_PRESSURE,
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nsJSContext::NonIncrementalGC,
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nsJSContext::ShrinkingGC);
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nsJSContext::CycleCollectNow();
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if (NeedsGCAfterCC()) {
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nsJSContext::GarbageCollectNow(JS::gcreason::MEM_PRESSURE,
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nsJSContext::NonIncrementalGC,
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nsJSContext::ShrinkingGC);
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}
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}
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} else if (!nsCRT::strcmp(aTopic, "user-interaction-inactive")) {
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if (StaticPrefs::javascript_options_compact_on_user_inactive()) {
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nsJSContext::PokeShrinkingGC();
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}
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} else if (!nsCRT::strcmp(aTopic, "user-interaction-active")) {
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nsJSContext::KillShrinkingGCTimer();
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if (sIsCompactingOnUserInactive) {
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AutoJSAPI jsapi;
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jsapi.Init();
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JS::AbortIncrementalGC(jsapi.cx());
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}
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MOZ_ASSERT(!sIsCompactingOnUserInactive);
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} else if (!nsCRT::strcmp(aTopic, "quit-application") ||
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!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
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sShuttingDown = true;
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KillTimers();
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}
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return NS_OK;
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}
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/****************************************************************
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************************** AutoFree ****************************
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****************************************************************/
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class AutoFree {
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public:
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explicit AutoFree(void* aPtr) : mPtr(aPtr) {
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}
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~AutoFree() {
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if (mPtr)
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free(mPtr);
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}
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void Invalidate() {
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mPtr = 0;
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}
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private:
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void *mPtr;
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};
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// A utility function for script languages to call. Although it looks small,
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// the use of nsIDocShell and nsPresContext triggers a huge number of
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// dependencies that most languages would not otherwise need.
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// XXXmarkh - This function is mis-placed!
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bool
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NS_HandleScriptError(nsIScriptGlobalObject *aScriptGlobal,
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const ErrorEventInit &aErrorEventInit,
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nsEventStatus *aStatus)
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{
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bool called = false;
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nsCOMPtr<nsPIDOMWindowInner> win(do_QueryInterface(aScriptGlobal));
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nsIDocShell *docShell = win ? win->GetDocShell() : nullptr;
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if (docShell) {
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RefPtr<nsPresContext> presContext;
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docShell->GetPresContext(getter_AddRefs(presContext));
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static int32_t errorDepth; // Recursion prevention
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++errorDepth;
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if (errorDepth < 2) {
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// Dispatch() must be synchronous for the recursion block
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// (errorDepth) to work.
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RefPtr<ErrorEvent> event =
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ErrorEvent::Constructor(nsGlobalWindowInner::Cast(win),
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NS_LITERAL_STRING("error"),
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aErrorEventInit);
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event->SetTrusted(true);
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EventDispatcher::DispatchDOMEvent(win, nullptr, event, presContext,
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aStatus);
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called = true;
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}
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--errorDepth;
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}
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return called;
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}
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class ScriptErrorEvent : public Runnable
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{
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public:
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ScriptErrorEvent(nsPIDOMWindowInner* aWindow,
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JS::RootingContext* aRootingCx,
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xpc::ErrorReport* aReport,
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JS::Handle<JS::Value> aError)
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: mozilla::Runnable("ScriptErrorEvent")
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, mWindow(aWindow)
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, mReport(aReport)
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, mError(aRootingCx, aError)
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{}
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NS_IMETHOD Run() override
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{
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nsEventStatus status = nsEventStatus_eIgnore;
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nsPIDOMWindowInner* win = mWindow;
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MOZ_ASSERT(win);
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MOZ_ASSERT(NS_IsMainThread());
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// First, notify the DOM that we have a script error, but only if
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// our window is still the current inner.
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JS::RootingContext* rootingCx = RootingCx();
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if (win->IsCurrentInnerWindow() && win->GetDocShell() && !sHandlingScriptError) {
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AutoRestore<bool> recursionGuard(sHandlingScriptError);
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sHandlingScriptError = true;
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RefPtr<nsPresContext> presContext;
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win->GetDocShell()->GetPresContext(getter_AddRefs(presContext));
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RootedDictionary<ErrorEventInit> init(rootingCx);
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init.mCancelable = true;
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init.mFilename = mReport->mFileName;
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init.mBubbles = true;
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NS_NAMED_LITERAL_STRING(xoriginMsg, "Script error.");
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if (!mReport->mIsMuted) {
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init.mMessage = mReport->mErrorMsg;
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init.mLineno = mReport->mLineNumber;
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init.mColno = mReport->mColumn;
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init.mError = mError;
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} else {
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NS_WARNING("Not same origin error!");
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init.mMessage = xoriginMsg;
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init.mLineno = 0;
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}
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RefPtr<ErrorEvent> event =
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ErrorEvent::Constructor(nsGlobalWindowInner::Cast(win),
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NS_LITERAL_STRING("error"), init);
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event->SetTrusted(true);
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EventDispatcher::DispatchDOMEvent(win, nullptr, event, presContext,
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&status);
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}
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if (status != nsEventStatus_eConsumeNoDefault) {
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JS::Rooted<JSObject*> stack(rootingCx);
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JS::Rooted<JSObject*> stackGlobal(rootingCx);
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xpc::FindExceptionStackForConsoleReport(win, mError,
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&stack, &stackGlobal);
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mReport->LogToConsoleWithStack(stack, stackGlobal);
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}
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return NS_OK;
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}
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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<nsIDocument> 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::AutoValueVector 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::AutoValueVector& 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::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;
|
|
}
|
|
|
|
//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, 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<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>(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();
|
|
}
|
|
|
|
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<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) {
|
|
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<nsIDocShellTreeItem> 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<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::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<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 || sShuttingDown || !sHasRunGC) {
|
|
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<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.formatJSON(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();
|
|
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<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) {
|
|
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<JSObject*> 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<JSObject*> 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
|
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{
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~JSDispatchableRunnable()
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{
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MOZ_ASSERT(!mDispatchable);
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}
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public:
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explicit JSDispatchableRunnable(JS::Dispatchable* aDispatchable)
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: mozilla::Runnable("JSDispatchableRunnable")
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, mDispatchable(aDispatchable)
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{
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MOZ_ASSERT(mDispatchable);
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}
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protected:
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NS_IMETHOD Run() override
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{
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MOZ_ASSERT(NS_IsMainThread());
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AutoJSAPI jsapi;
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jsapi.Init();
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JS::Dispatchable::MaybeShuttingDown maybeShuttingDown =
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sShuttingDown ? JS::Dispatchable::ShuttingDown : JS::Dispatchable::NotShuttingDown;
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mDispatchable->run(jsapi.cx(), maybeShuttingDown);
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mDispatchable = nullptr; // mDispatchable may delete itself
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return NS_OK;
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}
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private:
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JS::Dispatchable* mDispatchable;
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};
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static bool
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DispatchToEventLoop(void* closure, JS::Dispatchable* aDispatchable)
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{
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MOZ_ASSERT(!closure);
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// This callback may execute either on the main thread or a random JS-internal
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// helper thread. This callback can be called during shutdown so we cannot
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// simply NS_DispatchToMainThread. Failure during shutdown is expected and
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// properly handled by the JS engine.
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nsCOMPtr<nsIEventTarget> mainTarget = GetMainThreadEventTarget();
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if (!mainTarget) {
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return false;
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}
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|
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RefPtr<JSDispatchableRunnable> r = new JSDispatchableRunnable(aDispatchable);
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MOZ_ALWAYS_SUCCEEDS(mainTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
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return true;
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}
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|
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static bool
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ConsumeStream(JSContext* aCx,
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JS::HandleObject aObj,
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JS::MimeType aMimeType,
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JS::StreamConsumer* aConsumer)
|
|
{
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return FetchUtil::StreamResponseToJS(aCx, aObj, aMimeType, aConsumer, nullptr);
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}
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|
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void
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nsJSContext::EnsureStatics()
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{
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if (sIsInitialized) {
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if (!nsContentUtils::XPConnect()) {
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MOZ_CRASH();
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}
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return;
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}
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// Let's make sure that our main thread is the same as the xpcom main thread.
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MOZ_ASSERT(NS_IsMainThread());
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|
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AutoJSAPI jsapi;
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jsapi.Init();
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sPrevGCSliceCallback = JS::SetGCSliceCallback(jsapi.cx(), DOMGCSliceCallback);
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|
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// Set up the asm.js cache callbacks
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static const JS::AsmJSCacheOps asmJSCacheOps = {
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AsmJSCacheOpenEntryForRead,
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asmjscache::CloseEntryForRead,
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AsmJSCacheOpenEntryForWrite,
|
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asmjscache::CloseEntryForWrite
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};
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JS::SetAsmJSCacheOps(jsapi.cx(), &asmJSCacheOps);
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|
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JS::InitDispatchToEventLoop(jsapi.cx(), DispatchToEventLoop, nullptr);
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JS::InitConsumeStreamCallback(jsapi.cx(), ConsumeStream);
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// Set these global xpconnect options...
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Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackMB,
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"javascript.options.mem.high_water_mark",
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|
(void*)JSGC_MAX_MALLOC_BYTES);
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|
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Preferences::RegisterCallbackAndCall(SetMemoryPrefChangedCallbackMB,
|
|
"javascript.options.mem.max",
|
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(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,
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|
"javascript.options.mem.gc_max_empty_chunk_count",
|
|
(void *)JSGC_MAX_EMPTY_CHUNK_COUNT);
|
|
|
|
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
|
|
if (!obs) {
|
|
MOZ_CRASH();
|
|
}
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|
|
nsIObserver* observer = new nsJSEnvironmentObserver();
|
|
obs->AddObserver(observer, "memory-pressure", false);
|
|
obs->AddObserver(observer, "user-interaction-inactive", false);
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|
obs->AddObserver(observer, "user-interaction-active", false);
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|
obs->AddObserver(observer, "quit-application", false);
|
|
obs->AddObserver(observer, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
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|
|
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::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<nsIJSArgArray> ret = new nsJSArgArray(aContext, argc, argv, &rv);
|
|
if (NS_FAILED(rv)) {
|
|
return rv;
|
|
}
|
|
ret.forget(aArray);
|
|
return NS_OK;
|
|
}
|