The Tor Browser: dom/base/nsWrapperCacheInlines.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef nsWrapperCacheInline_h___

     7 #define nsWrapperCacheInline_h___

     9 #include "nsWrapperCache.h"

    10 #include "js/GCAPI.h"

    11 #include "js/TracingAPI.h"

    13 inline JSObject*

    14 nsWrapperCache::GetWrapper() const

    15 {

    16     JSObject* obj = GetWrapperPreserveColor();

    17     if (obj) {

    18       JS::ExposeObjectToActiveJS(obj);

    19     }

    20     return obj;

    21 }

    23 inline bool

    24 nsWrapperCache::IsBlack()

    25 {

    26   JSObject* o = GetWrapperPreserveColor();

    27   return o && !JS::GCThingIsMarkedGray(o);

    28 }

    30 static void

    31 SearchGray(void* aGCThing, const char* aName, void* aClosure)

    32 {

    33   bool* hasGrayObjects = static_cast<bool*>(aClosure);

    34   if (!*hasGrayObjects && aGCThing && JS::GCThingIsMarkedGray(aGCThing)) {

    35     *hasGrayObjects = true;

    36   }

    37 }

    39 inline bool

    40 nsWrapperCache::HasNothingToTrace(nsISupports* aThis)

    41 {

    42   nsXPCOMCycleCollectionParticipant* participant = nullptr;

    43   CallQueryInterface(aThis, &participant);

    44   bool hasGrayObjects = false;

    45   participant->Trace(aThis, TraceCallbackFunc(SearchGray), &hasGrayObjects);

    46   return !hasGrayObjects;

    47 }

    49 inline bool

    50 nsWrapperCache::IsBlackAndDoesNotNeedTracing(nsISupports* aThis)

    51 {

    52   return IsBlack() && HasNothingToTrace(aThis);

    53 }

    55 inline void

    56 nsWrapperCache::TraceWrapperJSObject(JSTracer* aTrc, const char* aName)

    57 {

    58   JS_CallHeapObjectTracer(aTrc, &mWrapper, aName);

    59 }

    61 #endif /* nsWrapperCache_h___ */

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