pythonnet_sample/src/runtime/managedtype.cs at master · usingsystem007/pythonnet_sample · GitHub

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using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Runtime.InteropServices;

using System.Linq;

namespace Python.Runtime

{

/// <summary>

/// Common base class for all objects that are implemented in managed

/// code. It defines the common fields that associate CLR and Python

/// objects and common utilities to convert between those identities.

/// </summary>

[Serializable]

internal abstract class ManagedType

{

internal enum TrackTypes

{

Untrack,

Extension,

Wrapper,

}

[NonSerialized]

internal GCHandle gcHandle; // Native handle

internal IntPtr pyHandle; // PyObject *

internal IntPtr tpHandle; // PyType *

internal BorrowedReference ObjectReference => new BorrowedReference(pyHandle);

private static readonly Dictionary<ManagedType, TrackTypes> _managedObjs = new Dictionary<ManagedType, TrackTypes>();

internal void IncrRefCount()

{

Runtime.XIncref(pyHandle);

}

internal void DecrRefCount()

{

Runtime.XDecref(pyHandle);

}

internal long RefCount

{

get

{

var gs = Runtime.PyGILState_Ensure();

try

{

return Runtime.Refcount(pyHandle);

}

finally

{

Runtime.PyGILState_Release(gs);

}

internal GCHandle AllocGCHandle(TrackTypes track = TrackTypes.Untrack)

{

gcHandle = GCHandle.Alloc(this);

if (track != TrackTypes.Untrack)

{

_managedObjs.Add(this, track);

}

return gcHandle;

}

internal void FreeGCHandle()

{

_managedObjs.Remove(this);

if (gcHandle.IsAllocated)

{

gcHandle.Free();

gcHandle = default;

}

internal static ManagedType GetManagedObject(BorrowedReference ob)

=> GetManagedObject(ob.DangerousGetAddress());

/// <summary>

/// Given a Python object, return the associated managed object or null.

/// </summary>

internal static ManagedType GetManagedObject(IntPtr ob)

{

if (ob != IntPtr.Zero)

{

IntPtr tp = Runtime.PyObject_TYPE(ob);

if (tp == Runtime.PyTypeType || tp == Runtime.PyCLRMetaType)

{

tp = ob;

}

var flags = Util.ReadCLong(tp, TypeOffset.tp_flags);

if ((flags & TypeFlags.Managed) != 0)

{

IntPtr op = tp == ob

? Marshal.ReadIntPtr(tp, TypeOffset.magic())

: Marshal.ReadIntPtr(ob, ObjectOffset.magic(tp));

if (op == IntPtr.Zero)

{

return null;

}

var gc = (GCHandle)op;

return (ManagedType)gc.Target;

}

return null;

}

/// <summary>

/// Given a Python object, return the associated managed object type or null.

/// </summary>

internal static ManagedType GetManagedObjectType(IntPtr ob)

{

if (ob != IntPtr.Zero)

{

IntPtr tp = Runtime.PyObject_TYPE(ob);

var flags = Util.ReadCLong(tp, TypeOffset.tp_flags);

if ((flags & TypeFlags.Managed) != 0)

{

tp = Marshal.ReadIntPtr(tp, TypeOffset.magic());

var gc = (GCHandle)tp;

return (ManagedType)gc.Target;

}

return null;

}

internal static ManagedType GetManagedObjectErr(IntPtr ob)

{

ManagedType result = GetManagedObject(ob);

if (result == null)

{

Exceptions.SetError(Exceptions.TypeError, "invalid argument, expected CLR type");

}

return result;

}

internal static bool IsManagedType(BorrowedReference ob)

=> IsManagedType(ob.DangerousGetAddressOrNull());

internal static bool IsManagedType(IntPtr ob)

{

if (ob != IntPtr.Zero)

{

IntPtr tp = Runtime.PyObject_TYPE(ob);

if (tp == Runtime.PyTypeType || tp == Runtime.PyCLRMetaType)

{

tp = ob;

}

var flags = Util.ReadCLong(tp, TypeOffset.tp_flags);

if ((flags & TypeFlags.Managed) != 0)

{

return true;

}

return false;

}

public bool IsTypeObject()

{

return pyHandle == tpHandle;

}

internal static IDictionary<ManagedType, TrackTypes> GetManagedObjects()

{

return _managedObjs;

}

internal static void ClearTrackedObjects()

{

_managedObjs.Clear();

}

internal static int PyVisit(IntPtr ob, IntPtr visit, IntPtr arg)

{

if (ob == IntPtr.Zero)

{

return 0;

}

var visitFunc = NativeCall.GetDelegate<Interop.ObjObjFunc>(visit);

return visitFunc(ob, arg);

}

/// <summary>

/// Wrapper for calling tp_clear

/// </summary>

internal void CallTypeClear()

{

if (tpHandle == IntPtr.Zero || pyHandle == IntPtr.Zero)

{

return;

}

var clearPtr = Marshal.ReadIntPtr(tpHandle, TypeOffset.tp_clear);

if (clearPtr == IntPtr.Zero)

{

return;

}

var clearFunc = NativeCall.GetDelegate<Interop.InquiryFunc>(clearPtr);

clearFunc(pyHandle);

}

/// <summary>

/// Wrapper for calling tp_traverse

/// </summary>

internal void CallTypeTraverse(Interop.ObjObjFunc visitproc, IntPtr arg)

{

if (tpHandle == IntPtr.Zero || pyHandle == IntPtr.Zero)

{

return;

}

var traversePtr = Marshal.ReadIntPtr(tpHandle, TypeOffset.tp_traverse);

if (traversePtr == IntPtr.Zero)

{

return;

}

var traverseFunc = NativeCall.GetDelegate<Interop.ObjObjArgFunc>(traversePtr);

var visiPtr = Marshal.GetFunctionPointerForDelegate(visitproc);

traverseFunc(pyHandle, visiPtr, arg);

}

protected void TypeClear()

{

ClearObjectDict(pyHandle);

}

internal void Save(InterDomainContext context)

{

OnSave(context);

}

internal void Load(InterDomainContext context)

{

OnLoad(context);

}

protected virtual void OnSave(InterDomainContext context) { }

protected virtual void OnLoad(InterDomainContext context) { }

protected static void ClearObjectDict(IntPtr ob)

{

IntPtr dict = GetObjectDict(ob);

if (dict == IntPtr.Zero)

{

return;

}

SetObjectDict(ob, IntPtr.Zero);

Runtime.XDecref(dict);

}

protected static IntPtr GetObjectDict(IntPtr ob)

{

IntPtr type = Runtime.PyObject_TYPE(ob);

return Marshal.ReadIntPtr(ob, ObjectOffset.TypeDictOffset(type));

}

protected static void SetObjectDict(IntPtr ob, IntPtr value)

{

IntPtr type = Runtime.PyObject_TYPE(ob);

Marshal.WriteIntPtr(ob, ObjectOffset.TypeDictOffset(type), value);

}

pythonnet_sample/src/runtime/managedtype.cs at master · usingsystem007/pythonnet_sample · GitHub

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