зеркало из https://github.com/mozilla/gecko-dev.git
66 строки
1.7 KiB
C++
66 строки
1.7 KiB
C++
/* -*- 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
|