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60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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 nsWrapperCacheInline_h___
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#define nsWrapperCacheInline_h___
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#include "nsWrapperCache.h"
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#include "xpcpublic.h"
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// We want to encode 3 bits into mWrapperPtrBits, so anything we store in it
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// needs to be aligned on 8 byte boundaries.
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// JS arenas are aligned on 4k boundaries and padded so that the array of
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// JSObjects ends on the end of the arena. If the size of a JSObject is a
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// multiple of 8 then the start of every JSObject in an arena should be aligned
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// on 8 byte boundaries.
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MOZ_STATIC_ASSERT(sizeof(js::shadow::Object) % 8 == 0 && sizeof(JS::Value) == 8,
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"We want to rely on JSObject being aligned on 8 byte "
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"boundaries.");
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inline JSObject*
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nsWrapperCache::GetWrapper() const
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{
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JSObject* obj = GetWrapperPreserveColor();
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xpc_UnmarkGrayObject(obj);
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return obj;
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}
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inline bool
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nsWrapperCache::IsBlack()
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{
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JSObject* o = GetWrapperPreserveColor();
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return o && !xpc_IsGrayGCThing(o);
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}
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static void
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SearchGray(void* aGCThing, const char* aName, void* aClosure)
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{
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bool* hasGrayObjects = static_cast<bool*>(aClosure);
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if (!*hasGrayObjects && aGCThing && xpc_IsGrayGCThing(aGCThing)) {
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*hasGrayObjects = true;
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}
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}
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inline bool
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nsWrapperCache::IsBlackAndDoesNotNeedTracing(nsISupports* aThis)
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{
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if (IsBlack()) {
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nsXPCOMCycleCollectionParticipant* participant = nullptr;
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CallQueryInterface(aThis, &participant);
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bool hasGrayObjects = false;
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participant->Trace(aThis, SearchGray, &hasGrayObjects);
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return !hasGrayObjects;
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}
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return false;
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}
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#endif /* nsWrapperCache_h___ */
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