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61 lines
1.8 KiB
C++
61 lines
1.8 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 nsCycleCollectionJSRuntime_h__
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#define nsCycleCollectionJSRuntime_h__
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class nsCycleCollectionParticipant;
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class nsCycleCollectionNoteRootCallback;
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// Various methods the cycle collector needs to deal with Javascript.
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struct nsCycleCollectionJSRuntime
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{
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virtual nsresult BeginCycleCollection(nsCycleCollectionNoteRootCallback &aCb) = 0;
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/**
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* Called before/after transitioning to/from the main thread.
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*
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* NotifyLeaveMainThread may return 'false' to prevent the cycle collector
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* from leaving the main thread.
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*/
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virtual bool NotifyLeaveMainThread() = 0;
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virtual void NotifyEnterCycleCollectionThread() = 0;
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virtual void NotifyLeaveCycleCollectionThread() = 0;
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virtual void NotifyEnterMainThread() = 0;
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/**
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* Unmark gray any weak map values, as needed.
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*/
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virtual void FixWeakMappingGrayBits() = 0;
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/**
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* Return true if merging content zones may greatly reduce the size of the CC graph.
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*/
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virtual bool UsefulToMergeZones() = 0;
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/**
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* Should we force a JavaScript GC before a CC?
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*/
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virtual bool NeedCollect() = 0;
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/**
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* Runs the JavaScript GC. |reason| is a gcreason::Reason from jsfriendapi.h.
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*/
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virtual void Collect(uint32_t aReason) = 0;
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/**
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* Get the JS cycle collection participant.
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*/
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virtual nsCycleCollectionParticipant *GetParticipant() = 0;
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#ifdef DEBUG
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virtual void SetObjectToUnlink(void* aObject) = 0;
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virtual void AssertNoObjectsToTrace(void* aPossibleJSHolder) = 0;
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#endif
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};
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#endif // nsCycleCollectionJSRuntime_h__
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