From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- xpcom/base/nsWeakReference.h | 68 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 xpcom/base/nsWeakReference.h (limited to 'xpcom/base/nsWeakReference.h') diff --git a/xpcom/base/nsWeakReference.h b/xpcom/base/nsWeakReference.h new file mode 100644 index 0000000000..5303f2d2ea --- /dev/null +++ b/xpcom/base/nsWeakReference.h @@ -0,0 +1,68 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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 nsWeakReference_h__ +#define nsWeakReference_h__ + +// nsWeakReference.h + +// See mfbt/WeakPtr.h for a more typesafe C++ implementation of weak references + +#include "nsIWeakReferenceUtils.h" + +class nsWeakReference; + +class nsSupportsWeakReference : public nsISupportsWeakReference { + public: + nsSupportsWeakReference() : mProxy(0) {} + + NS_DECL_NSISUPPORTSWEAKREFERENCE + + protected: + inline ~nsSupportsWeakReference(); + + private: + friend class nsWeakReference; + + // Called (only) by an |nsWeakReference| from _its_ dtor. + // The thread safety check is made by the caller. + void NoticeProxyDestruction() { mProxy = nullptr; } + + nsWeakReference* MOZ_NON_OWNING_REF mProxy; + + protected: + void ClearWeakReferences(); + bool HasWeakReferences() const { return !!mProxy; } +}; + +inline nsSupportsWeakReference::~nsSupportsWeakReference() { + ClearWeakReferences(); +} + +#define NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE \ + tmp->ClearWeakReferences(); + +#define NS_IMPL_CYCLE_COLLECTION_WEAK(class_, ...) \ + NS_IMPL_CYCLE_COLLECTION_CLASS(class_) \ + NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(class_) \ + NS_IMPL_CYCLE_COLLECTION_UNLINK(__VA_ARGS__) \ + NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE \ + NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ + NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(class_) \ + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(__VA_ARGS__) \ + NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +#define NS_IMPL_CYCLE_COLLECTION_WEAK_INHERITED(class_, super_, ...) \ + NS_IMPL_CYCLE_COLLECTION_CLASS(class_) \ + NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(class_, super_) \ + NS_IMPL_CYCLE_COLLECTION_UNLINK(__VA_ARGS__) \ + NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE \ + NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ + NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(class_, super_) \ + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(__VA_ARGS__) \ + NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +#endif -- cgit v1.2.3