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-rw-r--r--xpcom/base/nsIWeakReference.idl114
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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/. */
+
+#include "nsISupports.idl"
+
+%{C++
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+
+// For MOZ_THREAD_SAFETY_OWNERSHIP_CHECKS_SUPPORTED.
+#include "nsDebug.h"
+
+#ifdef MOZ_THREAD_SAFETY_OWNERSHIP_CHECKS_SUPPORTED
+
+#define MOZ_WEAKREF_DECL_OWNINGTHREAD nsAutoOwningThread _mWeakRefOwningThread;
+#define MOZ_WEAKREF_ASSERT_OWNINGTHREAD \
+ _mWeakRefOwningThread.AssertOwnership("nsWeakReference not thread-safe")
+#define MOZ_WEAKREF_ASSERT_OWNINGTHREAD_DELEGATED(that) \
+ (that)->_mWeakRefOwningThread.AssertOwnership("nsWeakReference not thread-safe")
+
+#else
+
+#define MOZ_WEAKREF_DECL_OWNINGTHREAD
+#define MOZ_WEAKREF_ASSERT_OWNINGTHREAD do { } while (false)
+#define MOZ_WEAKREF_ASSERT_OWNINGTHREAD_DELEGATED(that) do { } while (false)
+
+#endif
+
+%}
+
+native MallocSizeOf(mozilla::MallocSizeOf);
+
+/**
+ * An instance of |nsIWeakReference| is a proxy object that cooperates with
+ * its referent to give clients a non-owning, non-dangling reference. Clients
+ * own the proxy, and should generally manage it with an |nsCOMPtr| (see the
+ * type |nsWeakPtr| for a |typedef| name that stands out) as they would any
+ * other XPCOM object. The |QueryReferent| member function provides a
+ * (hopefully short-lived) owning reference on demand, through which clients
+ * can get useful access to the referent, while it still exists.
+ *
+ * @version 1.0
+ * @see nsISupportsWeakReference
+ * @see nsWeakReference
+ * @see nsWeakPtr
+ */
+[scriptable, builtinclass, uuid(9188bc85-f92e-11d2-81ef-0060083a0bcf)]
+interface nsIWeakReference : nsISupports
+ {
+ /**
+ * |QueryReferent| queries the referent, if it exists, and like |QueryInterface|, produces
+ * an owning reference to the desired interface. It is designed to look and act exactly
+ * like (a proxied) |QueryInterface|. Don't hold on to the produced interface permanently;
+ * that would defeat the purpose of using a non-owning |nsIWeakReference| in the first place.
+ */
+ [binaryname(QueryReferentFromScript)]
+ void QueryReferent( in nsIIDRef uuid, [iid_is(uuid), retval] out nsQIResult result );
+
+ [notxpcom, nostdcall] size_t sizeOfOnlyThis(in MallocSizeOf aMallocSizeOf);
+%{C++
+ /**
+ * Returns true if the referring object is alive. Otherwise, false.
+ */
+ bool IsAlive() const
+ {
+ return !!mObject;
+ }
+
+ nsresult QueryReferent(const nsIID& aIID, void** aInstancePtr);
+
+protected:
+ friend class nsSupportsWeakReference;
+
+ nsIWeakReference(nsISupports* aObject)
+ : mObject(aObject)
+ {
+ }
+
+ nsIWeakReference() = delete;
+
+ MOZ_WEAKREF_DECL_OWNINGTHREAD
+
+ // The object we're holding a weak reference to.
+ nsISupports* MOZ_NON_OWNING_REF mObject;
+%}
+ };
+
+
+/**
+ * |nsISupportsWeakReference| is a factory interface which produces appropriate
+ * instances of |nsIWeakReference|. Weak references in this scheme can only be
+ * produced for objects that implement this interface.
+ *
+ * @version 1.0
+ * @see nsIWeakReference
+ * @see nsSupportsWeakReference
+ */
+[scriptable, uuid(9188bc86-f92e-11d2-81ef-0060083a0bcf)]
+interface nsISupportsWeakReference : nsISupports
+ {
+ /**
+ * |GetWeakReference| produces an appropriate instance of |nsIWeakReference|.
+ * As with all good XPCOM `getters', you own the resulting interface and should
+ * manage it with an |nsCOMPtr|.
+ *
+ * @see nsIWeakReference
+ * @see nsWeakPtr
+ * @see nsCOMPtr
+ */
+ nsIWeakReference GetWeakReference();
+ };