gecko-dev/dom/base/nsJSEnvironment.h

253 lines
7.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; 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"
class nsICycleCollectorListener;
class nsIXPConnectJSObjectHolder;
class nsScriptNameSpaceManager;
class nsCycleCollectionNoteRootCallback;
namespace JS {
class AutoValueVector;
}
namespace mozilla {
template <class> class Maybe;
struct CycleCollectorResults;
}
// 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
class nsJSContext : public nsIScriptContext
{
public:
nsJSContext(bool aGCOnDestruction, nsIScriptGlobalObject* aGlobalObject);
virtual ~nsJSContext();
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSContext,
nsIScriptContext)
virtual nsIScriptGlobalObject *GetGlobalObject() MOZ_OVERRIDE;
inline nsIScriptGlobalObject *GetGlobalObjectRef() { return mGlobalObjectRef; }
virtual JSContext* GetNativeContext() MOZ_OVERRIDE;
virtual nsresult InitContext() MOZ_OVERRIDE;
virtual bool IsContextInitialized() MOZ_OVERRIDE;
virtual nsresult SetProperty(JS::Handle<JSObject*> aTarget, const char* aPropName, nsISupports* aVal) MOZ_OVERRIDE;
virtual bool GetProcessingScriptTag() MOZ_OVERRIDE;
virtual void SetProcessingScriptTag(bool aResult) MOZ_OVERRIDE;
virtual nsresult InitClasses(JS::Handle<JSObject*> aGlobalObj) MOZ_OVERRIDE;
virtual void WillInitializeContext() MOZ_OVERRIDE;
virtual void DidInitializeContext() MOZ_OVERRIDE;
virtual void SetWindowProxy(JS::Handle<JSObject*> aWindowProxy) MOZ_OVERRIDE;
virtual JSObject* GetWindowProxy() MOZ_OVERRIDE;
virtual JSObject* GetWindowProxyPreserveColor() MOZ_OVERRIDE;
static void LoadStart();
static void LoadEnd();
enum IsCompartment {
CompartmentGC,
NonCompartmentGC
};
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,
IsCompartment aCompartment = NonCompartmentGC,
IsShrinking aShrinking = NonShrinkingGC,
int64_t aSliceMillis = 0);
static void ShrinkGCBuffersNow();
// 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();
static void BeginCycleCollectionCallback();
static void EndCycleCollectionCallback(mozilla::CycleCollectorResults &aResults);
static void PokeGC(JS::gcreason::Reason aReason, int aDelay = 0);
static void KillGCTimer();
static void PokeShrinkGCBuffers();
static void KillShrinkGCBuffersTimer();
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();
virtual void GC(JS::gcreason::Reason aReason) MOZ_OVERRIDE;
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;
}
protected:
nsresult InitializeExternalClasses();
// 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);
// Report the pending exception on our mContext, if any. This
// function will set aside the frame chain on mContext before
// reporting.
void ReportPendingException();
private:
void DestroyJSContext();
nsrefcnt GetCCRefcnt();
JSContext *mContext;
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 void JSOptionChangedCallback(const char *pref, void *data);
static bool DOMOperationCallback(JSContext *cx);
};
class nsIJSRuntimeService;
class nsIPrincipal;
class nsPIDOMWindow;
namespace mozilla {
namespace dom {
void StartupJSEnvironment();
void ShutdownJSEnvironment();
// Get the NameSpaceManager, creating if necessary
nsScriptNameSpaceManager* GetNameSpaceManager();
// Runnable that's used to do async error reporting
class AsyncErrorReporter : public nsRunnable
{
public:
// aWindow may be null if this error report is not associated with a window
AsyncErrorReporter(JSRuntime* aRuntime,
JSErrorReport* aErrorReport,
const char* aFallbackMessage,
bool aIsChromeError, // To determine category
nsPIDOMWindow* aWindow);
NS_IMETHOD Run()
{
ReportError();
return NS_OK;
}
protected:
// Do the actual error reporting
void ReportError();
nsString mErrorMsg;
nsString mFileName;
nsString mSourceLine;
nsCString mCategory;
uint32_t mLineNumber;
uint32_t mColumn;
uint32_t mFlags;
uint64_t mInnerWindowID;
};
} // 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)
/* prototypes */
void NS_ScriptErrorReporter(JSContext *cx, const char *message, JSErrorReport *report);
JSObject* NS_DOMReadStructuredClone(JSContext* cx,
JSStructuredCloneReader* reader, uint32_t tag,
uint32_t data, void* closure);
bool NS_DOMWriteStructuredClone(JSContext* cx,
JSStructuredCloneWriter* writer,
JS::Handle<JSObject*> obj, void *closure);
void NS_DOMStructuredCloneError(JSContext* cx, uint32_t errorid);
#endif /* nsJSEnvironment_h */