зеркало из https://github.com/mozilla/gecko-dev.git
82 строки
2.2 KiB
C++
82 строки
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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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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namespace detail {
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class WeakCacheBase;
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} // namespace detail
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namespace shadow {
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JS_PUBLIC_API(void)
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RegisterWeakCache(JS::Zone* zone, JS::detail::WeakCacheBase* cachep);
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JS_PUBLIC_API(void)
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RegisterWeakCache(JSRuntime* rt, JS::detail::WeakCacheBase* cachep);
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} // namespace shadow
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namespace detail {
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class WeakCacheBase : public mozilla::LinkedListElement<WeakCacheBase>
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{
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WeakCacheBase() = delete;
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explicit WeakCacheBase(const WeakCacheBase&) = delete;
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public:
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explicit WeakCacheBase(Zone* zone) {
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shadow::RegisterWeakCache(zone, this);
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}
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explicit WeakCacheBase(JSRuntime* rt) {
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shadow::RegisterWeakCache(rt, this);
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}
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WeakCacheBase(WeakCacheBase&& other) = default;
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virtual ~WeakCacheBase() {}
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virtual void sweep() = 0;
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virtual bool needsSweep() = 0;
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};
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} // namespace detail
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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. A WeakCache can be
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// specific to a zone, or across a whole runtime, depending on which
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// constructor is used.
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template <typename T>
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class WeakCache : protected detail::WeakCacheBase,
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public js::MutableWrappedPtrOperations<T, WeakCache<T>>
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{
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T cache;
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public:
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using Type = T;
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template <typename... Args>
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explicit WeakCache(Zone* zone, Args&&... args)
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: WeakCacheBase(zone), cache(mozilla::Forward<Args>(args)...)
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{}
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template <typename... Args>
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explicit WeakCache(JSRuntime* rt, Args&&... args)
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: WeakCacheBase(rt), cache(mozilla::Forward<Args>(args)...)
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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() override {
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GCPolicy<T>::sweep(&cache);
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}
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bool needsSweep() override {
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return cache.needsSweep();
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}
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};
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} // namespace JS
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#endif // js_SweepingAPI_h
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