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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef js_SweepingAPI_h
+#define js_SweepingAPI_h
+
+#include "js/HeapAPI.h"
+
+namespace js {
+template <typename T>
+class WeakCacheBase {};
+} // namespace js
+
+namespace JS {
+template <typename T> class WeakCache;
+
+namespace shadow {
+JS_PUBLIC_API(void)
+RegisterWeakCache(JS::Zone* zone, JS::WeakCache<void*>* cachep);
+} // namespace shadow
+
+// A WeakCache stores the given Sweepable container and links itself into a
+// list of such caches that are swept during each GC.
+template <typename T>
+class WeakCache : public js::WeakCacheBase<T>,
+ private mozilla::LinkedListElement<WeakCache<T>>
+{
+ friend class mozilla::LinkedListElement<WeakCache<T>>;
+ friend class mozilla::LinkedList<WeakCache<T>>;
+
+ WeakCache() = delete;
+ WeakCache(const WeakCache&) = delete;
+
+ using SweepFn = void (*)(T*);
+ SweepFn sweeper;
+ T cache;
+
+ public:
+ using Type = T;
+
+ template <typename U>
+ WeakCache(Zone* zone, U&& initial)
+ : cache(mozilla::Forward<U>(initial))
+ {
+ sweeper = GCPolicy<T>::sweep;
+ shadow::RegisterWeakCache(zone, reinterpret_cast<WeakCache<void*>*>(this));
+ }
+ WeakCache(WeakCache&& other)
+ : sweeper(other.sweeper),
+ cache(mozilla::Move(other.cache))
+ {
+ }
+
+ const T& get() const { return cache; }
+ T& get() { return cache; }
+
+ void sweep() { sweeper(&cache); }
+};
+
+} // namespace JS
+
+#endif // js_SweepingAPI_h