65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; 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 js_SweepingAPI_h
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#define js_SweepingAPI_h
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#include "js/HeapAPI.h"
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namespace js {
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template <typename T>
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class WeakCacheBase {};
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} // namespace js
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namespace JS {
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template <typename T> class WeakCache;
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namespace shadow {
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JS_PUBLIC_API(void)
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RegisterWeakCache(JS::Zone* zone, JS::WeakCache<void*>* cachep);
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} // namespace shadow
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// A WeakCache stores the given Sweepable container and links itself into a
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// list of such caches that are swept during each GC.
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template <typename T>
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class WeakCache : public js::WeakCacheBase<T>,
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private mozilla::LinkedListElement<WeakCache<T>>
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{
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friend class mozilla::LinkedListElement<WeakCache<T>>;
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friend class mozilla::LinkedList<WeakCache<T>>;
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WeakCache() = delete;
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WeakCache(const WeakCache&) = delete;
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using SweepFn = void (*)(T*);
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SweepFn sweeper;
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T cache;
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public:
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using Type = T;
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template <typename U>
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WeakCache(Zone* zone, U&& initial)
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: cache(mozilla::Forward<U>(initial))
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{
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sweeper = GCPolicy<T>::sweep;
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shadow::RegisterWeakCache(zone, reinterpret_cast<WeakCache<void*>*>(this));
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}
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WeakCache(WeakCache&& other)
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: sweeper(other.sweeper),
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cache(mozilla::Move(other.cache))
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{
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}
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const T& get() const { return cache; }
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T& get() { return cache; }
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void sweep() { sweeper(&cache); }
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};
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} // namespace JS
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#endif // js_SweepingAPI_h
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