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Clear weak reference list when an extension type is destroyed #1761

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Merged
merged 1 commit into from
Apr 10, 2022
Merged

Clear weak reference list when an extension type is destroyed #1761

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32 changes: 32 additions & 0 deletions src/embed_tests/ExtensionTypes.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,32 @@
using System;

using NUnit.Framework;

using Python.Runtime;

namespace Python.EmbeddingTest;

public class ExtensionTypes
{
[OneTimeSetUp]
public void SetUp()
{
PythonEngine.Initialize();
}

[OneTimeTearDown]
public void Dispose()
{
PythonEngine.Shutdown();
}

[Test]
public void WeakrefIsNone_AfterBoundMethodIsGone()
{
using var makeref = Py.Import("weakref").GetAttr("ref");
var boundMethod = new UriBuilder().ToPython().GetAttr(nameof(UriBuilder.GetHashCode));
var weakref = makeref.Invoke(boundMethod);
boundMethod.Dispose();
Assert.IsTrue(weakref.Invoke().IsNone());
}
}
6 changes: 6 additions & 0 deletions src/runtime/Types/ExtensionType.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,12 @@ public unsafe static void tp_dealloc(NewReference lastRef)

public static int tp_clear(BorrowedReference ob)
{
var weakrefs = Runtime.PyObject_GetWeakRefList(ob);
if (weakrefs != null)
{
Runtime.PyObject_ClearWeakRefs(ob);
}

if (TryFreeGCHandle(ob))
{
bool deleted = loadedExtensions.Remove(ob.DangerousGetAddress());
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6 changes: 6 additions & 0 deletions src/runtime/Types/MetaType.cs
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Expand Up @@ -273,6 +273,12 @@ public static NewReference mp_subscript(BorrowedReference tp, BorrowedReference
/// </summary>
public static void tp_dealloc(NewReference lastRef)
{
var weakrefs = Runtime.PyObject_GetWeakRefList(lastRef.Borrow());
if (weakrefs != null)
{
Runtime.PyObject_ClearWeakRefs(lastRef.Borrow());
}

// Fix this when we dont cheat on the handle for subclasses!

var flags = PyType.GetFlags(lastRef.Borrow());
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