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2e8b602108
When triggering an iframe load or starting to parse a document for an iframe, the main thread may often have some time before the new page has been created. Try to trigger CC/GC slice at such point in order to avoid collector later when page is already executing its JS --HG-- extra : rebase_source : 806df0af1dbaefb1761134eca0bb7c6ade6ac1a9
225 lines
7.2 KiB
C++
225 lines
7.2 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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#ifndef nsJSEnvironment_h
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#define nsJSEnvironment_h
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#include "nsIScriptContext.h"
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#include "nsIScriptGlobalObject.h"
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#include "nsCOMPtr.h"
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#include "nsIObserver.h"
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#include "prtime.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsIXPConnect.h"
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#include "nsIArray.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/TimeStamp.h"
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#include "nsThreadUtils.h"
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#include "xpcpublic.h"
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class nsICycleCollectorListener;
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class nsScriptNameSpaceManager;
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class nsIDocShell;
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namespace JS {
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class AutoValueVector;
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} // namespace JS
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namespace mozilla {
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template <class> class Maybe;
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struct CycleCollectorResults;
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} // namespace mozilla
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// The amount of time we wait between a request to GC (due to leaving
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// a page) and doing the actual GC.
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#define NS_GC_DELAY 4000 // ms
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#define NS_MAJOR_FORGET_SKIPPABLE_CALLS 5
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class nsJSContext : public nsIScriptContext
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{
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public:
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nsJSContext(bool aGCOnDestruction, nsIScriptGlobalObject* aGlobalObject);
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSContext,
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nsIScriptContext)
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virtual nsIScriptGlobalObject *GetGlobalObject() override;
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inline nsIScriptGlobalObject *GetGlobalObjectRef() { return mGlobalObjectRef; }
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virtual nsresult InitContext() override;
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virtual bool IsContextInitialized() override;
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virtual nsresult SetProperty(JS::Handle<JSObject*> aTarget, const char* aPropName, nsISupports* aVal) override;
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virtual bool GetProcessingScriptTag() override;
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virtual void SetProcessingScriptTag(bool aResult) override;
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virtual nsresult InitClasses(JS::Handle<JSObject*> aGlobalObj) override;
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virtual void WillInitializeContext() override;
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virtual void DidInitializeContext() override;
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virtual void SetWindowProxy(JS::Handle<JSObject*> aWindowProxy) override;
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virtual JSObject* GetWindowProxy() override;
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static void LoadStart();
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static void LoadEnd();
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enum IsShrinking {
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ShrinkingGC,
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NonShrinkingGC
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};
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enum IsIncremental {
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IncrementalGC,
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NonIncrementalGC
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};
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// Setup all the statics etc - safe to call multiple times after Startup().
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void EnsureStatics();
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static void GarbageCollectNow(JS::gcreason::Reason reason,
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IsIncremental aIncremental = NonIncrementalGC,
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IsShrinking aShrinking = NonShrinkingGC,
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int64_t aSliceMillis = 0);
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static void CycleCollectNow(nsICycleCollectorListener *aListener = nullptr);
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// Run a cycle collector slice, using a heuristic to decide how long to run it.
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static void RunCycleCollectorSlice(mozilla::TimeStamp aDeadline);
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// Run a cycle collector slice, using the given work budget.
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static void RunCycleCollectorWorkSlice(int64_t aWorkBudget);
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static void BeginCycleCollectionCallback();
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static void EndCycleCollectionCallback(mozilla::CycleCollectorResults &aResults);
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// Return the longest CC slice time since ClearMaxCCSliceTime() was last called.
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static uint32_t GetMaxCCSliceTimeSinceClear();
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static void ClearMaxCCSliceTime();
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// If there is some pending CC or GC timer/runner, this will run it.
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static void RunNextCollectorTimer(JS::gcreason::Reason aReason,
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mozilla::TimeStamp aDeadline = mozilla::TimeStamp());
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// If user has been idle and aDocShell is for an iframe being loaded in an
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// already loaded top level docshell, this will run a CC or GC
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// timer/runner if there is such pending.
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static void MaybeRunNextCollectorSlice(nsIDocShell* aDocShell,
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JS::gcreason::Reason aReason);
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// The GC should probably run soon, in the zone of object aObj (if given).
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static void PokeGC(JS::gcreason::Reason aReason, JSObject* aObj, int aDelay = 0);
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static void KillGCTimer();
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static void PokeShrinkingGC();
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static void KillShrinkingGCTimer();
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static void MaybePokeCC();
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static void KillCCRunner();
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static void KillICCRunner();
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static void KillFullGCTimer();
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static void KillInterSliceGCRunner();
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// Calling LikelyShortLivingObjectCreated() makes a GC more likely.
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static void LikelyShortLivingObjectCreated();
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static uint32_t CleanupsSinceLastGC();
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nsIScriptGlobalObject* GetCachedGlobalObject()
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{
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// Verify that we have a global so that this
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// does always return a null when GetGlobalObject() is null.
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JSObject* global = GetWindowProxy();
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return global ? mGlobalObjectRef.get() : nullptr;
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}
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protected:
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virtual ~nsJSContext();
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// Helper to convert xpcom datatypes to jsvals.
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nsresult ConvertSupportsTojsvals(nsISupports *aArgs,
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JS::Handle<JSObject*> aScope,
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JS::AutoValueVector &aArgsOut);
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nsresult AddSupportsPrimitiveTojsvals(nsISupports *aArg, JS::Value *aArgv);
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private:
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void Destroy();
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JS::Heap<JSObject*> mWindowProxy;
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bool mIsInitialized;
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bool mGCOnDestruction;
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bool mProcessingScriptTag;
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PRTime mModalStateTime;
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uint32_t mModalStateDepth;
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// mGlobalObjectRef ensures that the outer window stays alive as long as the
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// context does. It is eventually collected by the cycle collector.
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nsCOMPtr<nsIScriptGlobalObject> mGlobalObjectRef;
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static bool DOMOperationCallback(JSContext *cx);
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};
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namespace mozilla {
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namespace dom {
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void StartupJSEnvironment();
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void ShutdownJSEnvironment();
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// Get the NameSpaceManager, creating if necessary
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nsScriptNameSpaceManager* GetNameSpaceManager();
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// Peek the NameSpaceManager, without creating it.
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nsScriptNameSpaceManager* PeekNameSpaceManager();
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// Runnable that's used to do async error reporting
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class AsyncErrorReporter final : public mozilla::Runnable
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{
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public:
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// aWindow may be null if this error report is not associated with a window
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explicit AsyncErrorReporter(xpc::ErrorReport* aReport)
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: Runnable("dom::AsyncErrorReporter")
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, mReport(aReport)
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{}
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NS_IMETHOD Run() override
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{
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mReport->LogToConsole();
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return NS_OK;
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}
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protected:
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RefPtr<xpc::ErrorReport> mReport;
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};
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} // namespace dom
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} // namespace mozilla
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// An interface for fast and native conversion to/from nsIArray. If an object
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// supports this interface, JS can reach directly in for the argv, and avoid
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// nsISupports conversion. If this interface is not supported, the object will
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// be queried for nsIArray, and everything converted via xpcom objects.
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#define NS_IJSARGARRAY_IID \
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{ 0xb6acdac8, 0xf5c6, 0x432c, \
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{ 0xa8, 0x6e, 0x33, 0xee, 0xb1, 0xb0, 0xcd, 0xdc } }
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class nsIJSArgArray : public nsIArray
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IJSARGARRAY_IID)
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// Bug 312003 describes why this must be "void **", but after calling argv
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// may be cast to JS::Value* and the args found at:
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// ((JS::Value*)argv)[0], ..., ((JS::Value*)argv)[argc - 1]
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virtual nsresult GetArgs(uint32_t *argc, void **argv) = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIJSArgArray, NS_IJSARGARRAY_IID)
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#endif /* nsJSEnvironment_h */
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