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Merged
lostmsu merged 2 commits into from
Jul 7, 2021
Merged

Prevent crash during debugging when attempting to inspect PyObject #1483

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0923f4f
prevent crash during debugging when attempting to inspect PyObject wi…
lostmsu Sep 5, 2020
00bc43d
added DebuggerDisplay to CLRObject
lostmsu Jul 7, 2021
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prevent crash during debugging when attempting to inspect PyObject wi… 
…thout GIL
  • Loading branch information
@lostmsu
lostmsu committed Jul 7, 2021
commit 0923f4f02c638468937b160495e7907b68ed402f
2 changes: 2 additions & 0 deletions src/runtime/Util.cs
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Expand Up @@ -7,6 +7,8 @@ internal static class Util
{
internal const string UnstableApiMessage =
"This API is unstable, and might be changed or removed in the next minor release";
internal const string MinimalPythonVersionRequired =
"Only Python 3.5 or newer is supported";

internal static Int64 ReadCLong(IntPtr tp, int offset)
{
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8 changes: 8 additions & 0 deletions src/runtime/debughelper.cs
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Expand Up @@ -144,5 +144,13 @@ public static void AssertHasReferences(IntPtr obj)
long refcount = Runtime.Refcount(obj);
Debug.Assert(refcount > 0, "Object refcount is 0 or less");
}

[Conditional("DEBUG")]
public static void EnsureGIL()
{
Debug.Assert(HaveInterpreterLock(), "GIL must be acquired");
}

public static bool HaveInterpreterLock() => Runtime.PyGILState_Check() == 1;
}
}
5 changes: 5 additions & 0 deletions src/runtime/pyobject.cs
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Expand Up @@ -16,6 +16,7 @@ namespace Python.Runtime
/// for details.
/// </summary>
[Serializable]
[DebuggerDisplay("{" + nameof(DebuggerDisplay) + ",nq}")]
public partial class PyObject : DynamicObject, IEnumerable<PyObject>, IDisposable
{
#if TRACE_ALLOC
Expand Down Expand Up @@ -1069,6 +1070,10 @@ public override string ToString()
return result;
}

string DebuggerDisplay => DebugUtil.HaveInterpreterLock()
? this.ToString()
: $"pyobj at 0x{this.obj:X} (get Py.GIL to see more info)";


/// <summary>
/// Equals Method
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11 changes: 10 additions & 1 deletion src/runtime/runtime.cs
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Expand Up @@ -832,7 +832,7 @@ internal static unsafe long Refcount(IntPtr op)

internal static IntPtr PyThreadState_Swap(IntPtr key) => Delegates.PyThreadState_Swap(key);


internal static int PyGILState_Check() => Delegates.PyGILState_Check();
internal static IntPtr PyGILState_Ensure() => Delegates.PyGILState_Ensure();


Expand Down Expand Up @@ -2302,6 +2302,14 @@ static Delegates()
PyThread_get_thread_ident = (delegate* unmanaged[Cdecl]<int>)GetFunctionByName(nameof(PyThread_get_thread_ident), GetUnmanagedDll(_PythonDll));
PyThread_set_key_value = (delegate* unmanaged[Cdecl]<IntPtr, IntPtr, int>)GetFunctionByName(nameof(PyThread_set_key_value), GetUnmanagedDll(_PythonDll));
PyThreadState_Swap = (delegate* unmanaged[Cdecl]<IntPtr, IntPtr>)GetFunctionByName(nameof(PyThreadState_Swap), GetUnmanagedDll(_PythonDll));
try
{
PyGILState_Check = (delegate* unmanaged[Cdecl]<int>)GetFunctionByName(nameof(PyGILState_Check), GetUnmanagedDll(_PythonDll));
}
catch (MissingMethodException e)
{
throw new NotSupportedException(Util.MinimalPythonVersionRequired, innerException: e);
}
PyGILState_Ensure = (delegate* unmanaged[Cdecl]<IntPtr>)GetFunctionByName(nameof(PyGILState_Ensure), GetUnmanagedDll(_PythonDll));
PyGILState_Release = (delegate* unmanaged[Cdecl]<IntPtr, void>)GetFunctionByName(nameof(PyGILState_Release), GetUnmanagedDll(_PythonDll));
PyGILState_GetThisThreadState = (delegate* unmanaged[Cdecl]<IntPtr>)GetFunctionByName(nameof(PyGILState_GetThisThreadState), GetUnmanagedDll(_PythonDll));
Expand Down Expand Up @@ -2605,6 +2613,7 @@ static Delegates()
internal static delegate* unmanaged[Cdecl]<int> PyThread_get_thread_ident { get; }
internal static delegate* unmanaged[Cdecl]<IntPtr, IntPtr, int> PyThread_set_key_value { get; }
internal static delegate* unmanaged[Cdecl]<IntPtr, IntPtr> PyThreadState_Swap { get; }
internal static delegate* unmanaged[Cdecl]<int> PyGILState_Check { get; }
internal static delegate* unmanaged[Cdecl]<IntPtr> PyGILState_Ensure { get; }
internal static delegate* unmanaged[Cdecl]<IntPtr, void> PyGILState_Release { get; }
internal static delegate* unmanaged[Cdecl]<IntPtr> PyGILState_GetThisThreadState { get; }
Expand Down