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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsJSEnvironment_h
#define nsJSEnvironment_h
#include "nsIScriptContext.h"
#include "nsIScriptGlobalObject.h"
#include "nsCOMPtr.h"
#include "nsIObserver.h"
#include "prtime.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIXPConnect.h"
#include "nsIArray.h"
#include "mozilla/Attributes.h"
#include "nsThreadUtils.h"
#include "xpcpublic.h"
class nsICycleCollectorListener;
class nsScriptNameSpaceManager;
namespace JS {
class AutoValueVector;
} // namespace JS
namespace mozilla {
template <class> class Maybe;
struct CycleCollectorResults;
} // namespace mozilla
// The amount of time we wait between a request to GC (due to leaving
// a page) and doing the actual GC.
#define NS_GC_DELAY 4000 // ms
#define NS_MAJOR_FORGET_SKIPPABLE_CALLS 5
class nsJSContext : public nsIScriptContext
{
public:
nsJSContext(bool aGCOnDestruction, nsIScriptGlobalObject* aGlobalObject);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSContext,
nsIScriptContext)
virtual nsIScriptGlobalObject *GetGlobalObject() override;
inline nsIScriptGlobalObject *GetGlobalObjectRef() { return mGlobalObjectRef; }
virtual nsresult InitContext() override;
virtual bool IsContextInitialized() override;
virtual nsresult SetProperty(JS::Handle<JSObject*> aTarget, const char* aPropName, nsISupports* aVal) override;
virtual bool GetProcessingScriptTag() override;
virtual void SetProcessingScriptTag(bool aResult) override;
virtual nsresult InitClasses(JS::Handle<JSObject*> aGlobalObj) override;
virtual void WillInitializeContext() override;
virtual void DidInitializeContext() override;
virtual void SetWindowProxy(JS::Handle<JSObject*> aWindowProxy) override;
virtual JSObject* GetWindowProxy() override;
static void LoadStart();
static void LoadEnd();
enum IsShrinking {
ShrinkingGC,
NonShrinkingGC
};
enum IsIncremental {
IncrementalGC,
NonIncrementalGC
};
// Setup all the statics etc - safe to call multiple times after Startup().
void EnsureStatics();
static void GarbageCollectNow(JS::gcreason::Reason reason,
IsIncremental aIncremental = NonIncrementalGC,
IsShrinking aShrinking = NonShrinkingGC,
int64_t aSliceMillis = 0);
// If aExtraForgetSkippableCalls is -1, forgetSkippable won't be
// called even if the previous collection was GC.
static void CycleCollectNow(nsICycleCollectorListener *aListener = nullptr,
int32_t aExtraForgetSkippableCalls = 0);
// Run a cycle collector slice, using a heuristic to decide how long to run it.
static void RunCycleCollectorSlice();
// Run a cycle collector slice, using the given work budget.
static void RunCycleCollectorWorkSlice(int64_t aWorkBudget);
static void BeginCycleCollectionCallback();
static void EndCycleCollectionCallback(mozilla::CycleCollectorResults &aResults);
// Return the longest CC slice time since ClearMaxCCSliceTime() was last called.
static uint32_t GetMaxCCSliceTimeSinceClear();
static void ClearMaxCCSliceTime();
static void RunNextCollectorTimer();
static void PokeGC(JS::gcreason::Reason aReason, int aDelay = 0);
static void KillGCTimer();
static void PokeShrinkingGC();
static void KillShrinkingGCTimer();
static void MaybePokeCC();
static void KillCCTimer();
static void KillICCTimer();
static void KillFullGCTimer();
static void KillInterSliceGCTimer();
// Calling LikelyShortLivingObjectCreated() makes a GC more likely.
static void LikelyShortLivingObjectCreated();
static uint32_t CleanupsSinceLastGC();
nsIScriptGlobalObject* GetCachedGlobalObject()
{
// Verify that we have a global so that this
// does always return a null when GetGlobalObject() is null.
JSObject* global = GetWindowProxy();
return global ? mGlobalObjectRef.get() : nullptr;
}
static void NotifyDidPaint();
protected:
virtual ~nsJSContext();
// Helper to convert xpcom datatypes to jsvals.
nsresult ConvertSupportsTojsvals(nsISupports *aArgs,
JS::Handle<JSObject*> aScope,
JS::AutoValueVector &aArgsOut);
nsresult AddSupportsPrimitiveTojsvals(nsISupports *aArg, JS::Value *aArgv);
private:
void Destroy();
JS::Heap<JSObject*> mWindowProxy;
bool mIsInitialized;
bool mGCOnDestruction;
bool mProcessingScriptTag;
PRTime mModalStateTime;
uint32_t mModalStateDepth;
// mGlobalObjectRef ensures that the outer window stays alive as long as the
// context does. It is eventually collected by the cycle collector.
nsCOMPtr<nsIScriptGlobalObject> mGlobalObjectRef;
static bool DOMOperationCallback(JSContext *cx);
};
namespace mozilla {
namespace dom {
void StartupJSEnvironment();
void ShutdownJSEnvironment();
// Get the NameSpaceManager, creating if necessary
nsScriptNameSpaceManager* GetNameSpaceManager();
// Peek the NameSpaceManager, without creating it.
nsScriptNameSpaceManager* PeekNameSpaceManager();
// Runnable that's used to do async error reporting
class AsyncErrorReporter final : public mozilla::Runnable
{
public:
// aWindow may be null if this error report is not associated with a window
explicit AsyncErrorReporter(xpc::ErrorReport* aReport)
: mReport(aReport)
{}
NS_IMETHOD Run() override
{
mReport->LogToConsole();
return NS_OK;
}
protected:
RefPtr<xpc::ErrorReport> mReport;
};
} // namespace dom
} // namespace mozilla
// An interface for fast and native conversion to/from nsIArray. If an object
// supports this interface, JS can reach directly in for the argv, and avoid
// nsISupports conversion. If this interface is not supported, the object will
// be queried for nsIArray, and everything converted via xpcom objects.
#define NS_IJSARGARRAY_IID \
{ 0xb6acdac8, 0xf5c6, 0x432c, \
{ 0xa8, 0x6e, 0x33, 0xee, 0xb1, 0xb0, 0xcd, 0xdc } }
class nsIJSArgArray : public nsIArray
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IJSARGARRAY_IID)
// Bug 312003 describes why this must be "void **", but after calling argv
// may be cast to JS::Value* and the args found at:
// ((JS::Value*)argv)[0], ..., ((JS::Value*)argv)[argc - 1]
virtual nsresult GetArgs(uint32_t *argc, void **argv) = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIJSArgArray, NS_IJSARGARRAY_IID)
#endif /* nsJSEnvironment_h */
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