pythonnet/src/runtime/classderived.cs at master · MITEM/pythonnet · GitHub

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

using System.Reflection.Emit;

using System.Runtime.InteropServices;

using System.Threading.Tasks;

namespace Python.Runtime

{

/// <summary>

/// Managed class that provides the implementation for reflected types.

/// Managed classes and value types are represented in Python by actual

/// Python type objects. Each of those type objects is associated with

/// an instance of ClassObject, which provides its implementation.

/// </summary>

/// <remarks>

/// interface used to identify which C# types were dynamically created as python subclasses

/// </remarks>

public interface IPythonDerivedType

{

}

internal class ClassDerivedObject : ClassObject

{

private static Dictionary<string, AssemblyBuilder> assemblyBuilders;

private static Dictionary<Tuple<string, string>, ModuleBuilder> moduleBuilders;

static ClassDerivedObject()

{

assemblyBuilders = new Dictionary<string, AssemblyBuilder>();

moduleBuilders = new Dictionary<Tuple<string, string>, ModuleBuilder>();

}

internal ClassDerivedObject(Type tp) : base(tp)

{

}

/// <summary>

/// Implements __new__ for derived classes of reflected classes.

/// </summary>

public new static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw)

{

var cls = GetManagedObject(tp) as ClassDerivedObject;

// call the managed constructor

object obj = cls.binder.InvokeRaw(IntPtr.Zero, args, kw);

if (obj == null)

{

return IntPtr.Zero;

}

// return the pointer to the python object

// (this indirectly calls ClassDerivedObject.ToPython)

return Converter.ToPython(obj, cls.GetType());

}

public new static void tp_dealloc(IntPtr ob)

{

var self = (CLRObject)GetManagedObject(ob);

// don't let the python GC destroy this object

Runtime.PyObject_GC_UnTrack(self.pyHandle);

// The python should now have a ref count of 0, but we don't actually want to

// deallocate the object until the C# object that references it is destroyed.

// So we don't call PyObject_GC_Del here and instead we set the python

// reference to a weak reference so that the C# object can be collected.

GCHandle gc = GCHandle.Alloc(self, GCHandleType.Weak);

Marshal.WriteIntPtr(self.pyHandle, ObjectOffset.magic(self.tpHandle), (IntPtr)gc);

self.gcHandle.Free();

self.gcHandle = gc;

}

/// <summary>

/// Called from Converter.ToPython for types that are python subclasses of managed types.

/// The referenced python object is returned instead of a new wrapper.

/// </summary>

internal static IntPtr ToPython(IPythonDerivedType obj)

{

// derived types have a __pyobj__ field that gets set to the python

// object in the overridden constructor

FieldInfo fi = obj.GetType().GetField("__pyobj__");

var self = (CLRObject)fi.GetValue(obj);

Runtime.XIncref(self.pyHandle);

// when the C# constructor creates the python object it starts as a weak

// reference with a reference count of 0. Now we're passing this object

// to Python the reference count needs to be incremented and the reference

// needs to be replaced with a strong reference to stop the C# object being

// collected while Python still has a reference to it.

if (Runtime.Refcount(self.pyHandle) == 1)

{

GCHandle gc = GCHandle.Alloc(self, GCHandleType.Normal);

Marshal.WriteIntPtr(self.pyHandle, ObjectOffset.magic(self.tpHandle), (IntPtr)gc);

self.gcHandle.Free();

self.gcHandle = gc;

// now the object has a python reference it's safe for the python GC to track it

Runtime.PyObject_GC_Track(self.pyHandle);

}

return self.pyHandle;

}

/// <summary>

/// Creates a new managed type derived from a base type with any virtual

/// methods overridden to call out to python if the associated python

/// object has overridden the method.

/// </summary>

internal static Type CreateDerivedType(string name,

Type baseType,

IntPtr py_dict,

string namespaceStr,

string assemblyName,

string moduleName = "Python.Runtime.Dynamic.dll")

{

if (null != namespaceStr)

{

name = namespaceStr + "." + name;

}

if (null == assemblyName)

{

assemblyName = Assembly.GetExecutingAssembly().FullName;

}

ModuleBuilder moduleBuilder = GetModuleBuilder(assemblyName, moduleName);

Type baseClass = baseType;

var interfaces = new List<Type> { typeof(IPythonDerivedType) };

// if the base type is an interface then use System.Object as the base class

// and add the base type to the list of interfaces this new class will implement.

if (baseType.IsInterface)

{

interfaces.Add(baseType);

baseClass = typeof(object);

}

TypeBuilder typeBuilder = moduleBuilder.DefineType(name,

TypeAttributes.Public | TypeAttributes.Class,

baseClass,

interfaces.ToArray());

// add a field for storing the python object pointer

// FIXME: fb not used

FieldBuilder fb = typeBuilder.DefineField("__pyobj__", typeof(CLRObject), FieldAttributes.Public);

// override any constructors

ConstructorInfo[] constructors = baseClass.GetConstructors();

foreach (ConstructorInfo ctor in constructors)

{

AddConstructor(ctor, baseType, typeBuilder);

}

// Override any properties explicitly overridden in python

var pyProperties = new HashSet<string>();

if (py_dict != IntPtr.Zero && Runtime.PyDict_Check(py_dict))

{

Runtime.XIncref(py_dict);

using (var dict = new PyDict(py_dict))

using (PyObject keys = dict.Keys())

{

foreach (PyObject pyKey in keys)

{

using (PyObject value = dict[pyKey])

{

if (value.HasAttr("_clr_property_type_"))

{

string propertyName = pyKey.ToString();

pyProperties.Add(propertyName);

// Add the property to the type

AddPythonProperty(propertyName, value, typeBuilder);

}

// override any virtual methods not already overridden by the properties above

MethodInfo[] methods = baseType.GetMethods();

var virtualMethods = new HashSet<string>();

foreach (MethodInfo method in methods)

{

if (!method.Attributes.HasFlag(MethodAttributes.Virtual) |

method.Attributes.HasFlag(MethodAttributes.Final))

{

continue;

}

// skip if this property has already been overridden

if ((method.Name.StartsWith("get_") || method.Name.StartsWith("set_"))

&& pyProperties.Contains(method.Name.Substring(4)))

{

continue;

}

// keep track of the virtual methods redirected to the python instance

virtualMethods.Add(method.Name);

// override the virtual method to call out to the python method, if there is one.

AddVirtualMethod(method, baseType, typeBuilder);

}

// Add any additional methods and properties explicitly exposed from Python.

if (py_dict != IntPtr.Zero && Runtime.PyDict_Check(py_dict))

{

Runtime.XIncref(py_dict);

using (var dict = new PyDict(py_dict))

using (PyObject keys = dict.Keys())

{

foreach (PyObject pyKey in keys)

{

using (PyObject value = dict[pyKey])

{

if (value.HasAttr("_clr_return_type_") && value.HasAttr("_clr_arg_types_"))

{

string methodName = pyKey.ToString();

// if this method has already been redirected to the python method skip it

if (virtualMethods.Contains(methodName))

{

continue;

}

// Add the method to the type

AddPythonMethod(methodName, value, typeBuilder);

}

// add the destructor so the python object created in the constructor gets destroyed

MethodBuilder methodBuilder = typeBuilder.DefineMethod("Finalize",

MethodAttributes.Family |

MethodAttributes.Virtual |

MethodAttributes.HideBySig,

CallingConventions.Standard,

typeof(void),

Type.EmptyTypes);

ILGenerator il = methodBuilder.GetILGenerator();

il.Emit(OpCodes.Ldarg_0);

il.Emit(OpCodes.Call, typeof(PythonDerivedType).GetMethod("Finalize"));

il.Emit(OpCodes.Ldarg_0);

il.Emit(OpCodes.Call, baseClass.GetMethod("Finalize", BindingFlags.NonPublic | BindingFlags.Instance));

il.Emit(OpCodes.Ret);

Type type = typeBuilder.CreateType();

// scan the assembly so the newly added class can be imported

Assembly assembly = Assembly.GetAssembly(type);

AssemblyManager.ScanAssembly(assembly);

// FIXME: assemblyBuilder not used

AssemblyBuilder assemblyBuilder = assemblyBuilders[assemblyName];

return type;

}

/// <summary>

/// Add a constructor override that calls the python ctor after calling the base type constructor.

/// </summary>

/// <param name="ctor">constructor to be called before calling the python ctor</param>

/// <param name="baseType">Python callable object</param>

/// <param name="typeBuilder">TypeBuilder for the new type the ctor is to be added to</param>

private static void AddConstructor(ConstructorInfo ctor, Type baseType, TypeBuilder typeBuilder)

{

ParameterInfo[] parameters = ctor.GetParameters();

Type[] parameterTypes = (from param in parameters select param.ParameterType).ToArray();

// create a method for calling the original constructor

string baseCtorName = "_" + baseType.Name + "__cinit__";

MethodBuilder methodBuilder = typeBuilder.DefineMethod(baseCtorName,

MethodAttributes.Public |

MethodAttributes.Final |

MethodAttributes.HideBySig,

typeof(void),

parameterTypes);

// emit the assembly for calling the original method using call instead of callvirt

ILGenerator il = methodBuilder.GetILGenerator();

il.Emit(OpCodes.Ldarg_0);

for (var i = 0; i < parameters.Length; ++i)

{

il.Emit(OpCodes.Ldarg, i + 1);

}

il.Emit(OpCodes.Call, ctor);

il.Emit(OpCodes.Ret);

// override the original method with a new one that dispatches to python

ConstructorBuilder cb = typeBuilder.DefineConstructor(MethodAttributes.Public |

MethodAttributes.ReuseSlot |

MethodAttributes.HideBySig,

ctor.CallingConvention,

parameterTypes);

il = cb.GetILGenerator();

il.DeclareLocal(typeof(object[]));

il.Emit(OpCodes.Ldarg_0);

il.Emit(OpCodes.Ldstr, baseCtorName);

il.Emit(OpCodes.Ldc_I4, parameters.Length);

il.Emit(OpCodes.Newarr, typeof(object));

il.Emit(OpCodes.Stloc_0);

for (var i = 0; i < parameters.Length; ++i)

{

il.Emit(OpCodes.Ldloc_0);

il.Emit(OpCodes.Ldc_I4, i);

il.Emit(OpCodes.Ldarg, i + 1);

if (parameterTypes[i].IsValueType)

{

il.Emit(OpCodes.Box, parameterTypes[i]);

}

il.Emit(OpCodes.Stelem, typeof(object));

}

il.Emit(OpCodes.Ldloc_0);

il.Emit(OpCodes.Call, typeof(PythonDerivedType).GetMethod("InvokeCtor"));

il.Emit(OpCodes.Ret);

}

/// <summary>

/// Add a virtual method override that checks for an override on the python instance

/// and calls it, otherwise fall back to the base class method.

/// </summary>

/// <param name="method">virtual method to be overridden</param>

/// <param name="baseType">Python callable object</param>

/// <param name="typeBuilder">TypeBuilder for the new type the method is to be added to</param>

private static void AddVirtualMethod(MethodInfo method, Type baseType, TypeBuilder typeBuilder)

{

ParameterInfo[] parameters = method.GetParameters();

Type[] parameterTypes = (from param in parameters select param.ParameterType).ToArray();

// If the method isn't abstract create a method for calling the original method

string baseMethodName = null;

if (!method.IsAbstract)

{

baseMethodName = "_" + baseType.Name + "__" + method.Name;

MethodBuilder baseMethodBuilder = typeBuilder.DefineMethod(baseMethodName,

MethodAttributes.Public |

MethodAttributes.Final |

MethodAttributes.HideBySig,

method.ReturnType,

parameterTypes);

// emit the assembly for calling the original method using call instead of callvirt

ILGenerator baseIl = baseMethodBuilder.GetILGenerator();

baseIl.Emit(OpCodes.Ldarg_0);

for (var i = 0; i < parameters.Length; ++i)

{

baseIl.Emit(OpCodes.Ldarg, i + 1);

}

baseIl.Emit(OpCodes.Call, method);

baseIl.Emit(OpCodes.Ret);

}

// override the original method with a new one that dispatches to python

MethodBuilder methodBuilder = typeBuilder.DefineMethod(method.Name,

MethodAttributes.Public |

MethodAttributes.ReuseSlot |

MethodAttributes.Virtual |

MethodAttributes.HideBySig,

method.CallingConvention,

method.ReturnType,

parameterTypes);

ILGenerator il = methodBuilder.GetILGenerator();

il.DeclareLocal(typeof(object[]));

il.Emit(OpCodes.Ldarg_0);

il.Emit(OpCodes.Ldstr, method.Name);

// don't fall back to the base type's method if it's abstract

if (null != baseMethodName)

{

il.Emit(OpCodes.Ldstr, baseMethodName);

}

else

{

il.Emit(OpCodes.Ldnull);

}

il.Emit(OpCodes.Ldc_I4, parameters.Length);

il.Emit(OpCodes.Newarr, typeof(object));

il.Emit(OpCodes.Stloc_0);

for (var i = 0; i < parameters.Length; ++i)

{

il.Emit(OpCodes.Ldloc_0);

il.Emit(OpCodes.Ldc_I4, i);

il.Emit(OpCodes.Ldarg, i + 1);

if (parameterTypes[i].IsValueType)

{

il.Emit(OpCodes.Box, parameterTypes[i]);

}

il.Emit(OpCodes.Stelem, typeof(object));

}

il.Emit(OpCodes.Ldloc_0);

if (method.ReturnType == typeof(void))

{

il.Emit(OpCodes.Call, typeof(PythonDerivedType).GetMethod("InvokeMethodVoid"));

}

else

{

il.Emit(OpCodes.Call,

typeof(PythonDerivedType).GetMethod("InvokeMethod").MakeGenericMethod(method.ReturnType));

}

il.Emit(OpCodes.Ret);

}

/// <summary>

/// Python method may have the following function attributes set to control how they're exposed:

/// - _clr_return_type_ - method return type (required)

/// - _clr_arg_types_ - list of method argument types (required)

/// - _clr_method_name_ - method name, if different from the python method name (optional)

/// </summary>

/// <param name="methodName">Method name to add to the type</param>

/// <param name="func">Python callable object</param>

/// <param name="typeBuilder">TypeBuilder for the new type the method/property is to be added to</param>

private static void AddPythonMethod(string methodName, PyObject func, TypeBuilder typeBuilder)

{

if (func.HasAttr("_clr_method_name_"))

{

using (PyObject pyMethodName = func.GetAttr("_clr_method_name_"))

{

methodName = pyMethodName.ToString();

}

using (PyObject pyReturnType = func.GetAttr("_clr_return_type_"))

using (PyObject pyArgTypes = func.GetAttr("_clr_arg_types_"))

{

var returnType = pyReturnType.AsManagedObject(typeof(Type)) as Type;

if (returnType == null)

{

returnType = typeof(void);

}

if (!pyArgTypes.IsIterable())

{

throw new ArgumentException("_clr_arg_types_ must be a list or tuple of CLR types");

}

var argTypes = new List<Type>();

foreach (PyObject pyArgType in pyArgTypes)

{

var argType = pyArgType.AsManagedObject(typeof(Type)) as Type;

if (argType == null)

{

throw new ArgumentException("_clr_arg_types_ must be a list or tuple of CLR types");

}

argTypes.Add(argType);

}

// add the method to call back into python

MethodAttributes methodAttribs = MethodAttributes.Public |

MethodAttributes.Virtual |

MethodAttributes.ReuseSlot |

MethodAttributes.HideBySig;

MethodBuilder methodBuilder = typeBuilder.DefineMethod(methodName,

methodAttribs,

returnType,

argTypes.ToArray());

ILGenerator il = methodBuilder.GetILGenerator();

il.DeclareLocal(typeof(object[]));

il.Emit(OpCodes.Ldarg_0);

il.Emit(OpCodes.Ldstr, methodName);

il.Emit(OpCodes.Ldnull); // don't fall back to the base type's method

il.Emit(OpCodes.Ldc_I4, argTypes.Count);

il.Emit(OpCodes.Newarr, typeof(object));

il.Emit(OpCodes.Stloc_0);

for (var i = 0; i < argTypes.Count; ++i)

{

il.Emit(OpCodes.Ldloc_0);

il.Emit(OpCodes.Ldc_I4, i);

il.Emit(OpCodes.Ldarg, i + 1);

if (argTypes[i].IsValueType)

{

il.Emit(OpCodes.Box, argTypes[i]);

}

il.Emit(OpCodes.Stelem, typeof(object));

}

il.Emit(OpCodes.Ldloc_0);

if (returnType == typeof(void))

{

il.Emit(OpCodes.Call, typeof(PythonDerivedType).GetMethod("InvokeMethodVoid"));

}

else

{

il.Emit(OpCodes.Call,

typeof(PythonDerivedType).GetMethod("InvokeMethod").MakeGenericMethod(returnType));

}

il.Emit(OpCodes.Ret);

}

/// <summary>

/// Python properties may have the following function attributes set to control how they're exposed:

/// - _clr_property_type_ - property type (required)

/// </summary>

/// <param name="propertyName">Property name to add to the type</param>

/// <param name="func">Python property object</param>

/// <param name="typeBuilder">TypeBuilder for the new type the method/property is to be added to</param>

private static void AddPythonProperty(string propertyName, PyObject func, TypeBuilder typeBuilder)

{

// add the method to call back into python

MethodAttributes methodAttribs = MethodAttributes.Public |

MethodAttributes.Virtual |

MethodAttributes.ReuseSlot |

MethodAttributes.HideBySig |

MethodAttributes.SpecialName;

using (PyObject pyPropertyType = func.GetAttr("_clr_property_type_"))

{

var propertyType = pyPropertyType.AsManagedObject(typeof(Type)) as Type;

if (propertyType == null)

{

throw new ArgumentException("_clr_property_type must be a CLR type");

}

PropertyBuilder propertyBuilder = typeBuilder.DefineProperty(propertyName,

PropertyAttributes.None,

propertyType,

null);

if (func.HasAttr("fget"))

{

using (PyObject pyfget = func.GetAttr("fget"))

{

if (pyfget.IsTrue())

{

MethodBuilder methodBuilder = typeBuilder.DefineMethod("get_" + propertyName,

methodAttribs,

propertyType,

null);

ILGenerator il = methodBuilder.GetILGenerator();

il.Emit(OpCodes.Ldarg_0);

il.Emit(OpCodes.Ldstr, propertyName);

il.Emit(OpCodes.Call,

typeof(PythonDerivedType).GetMethod("InvokeGetProperty").MakeGenericMethod(propertyType));

il.Emit(OpCodes.Ret);

propertyBuilder.SetGetMethod(methodBuilder);

}

if (func.HasAttr("fset"))

{

using (PyObject pyset = func.GetAttr("fset"))

{

if (pyset.IsTrue())

{

MethodBuilder methodBuilder = typeBuilder.DefineMethod("set_" + propertyName,

methodAttribs,

null,

new[] { propertyType });

ILGenerator il = methodBuilder.GetILGenerator();

il.Emit(OpCodes.Ldarg_0);

il.Emit(OpCodes.Ldstr, propertyName);

il.Emit(OpCodes.Ldarg_1);

il.Emit(OpCodes.Call,

typeof(PythonDerivedType).GetMethod("InvokeSetProperty").MakeGenericMethod(propertyType));

il.Emit(OpCodes.Ret);

propertyBuilder.SetSetMethod(methodBuilder);

}

private static ModuleBuilder GetModuleBuilder(string assemblyName, string moduleName)

{

// find or create a dynamic assembly and module

AppDomain domain = AppDomain.CurrentDomain;

ModuleBuilder moduleBuilder;

if (moduleBuilders.ContainsKey(Tuple.Create(assemblyName, moduleName)))

{

moduleBuilder = moduleBuilders[Tuple.Create(assemblyName, moduleName)];

}

else

{

AssemblyBuilder assemblyBuilder;

if (assemblyBuilders.ContainsKey(assemblyName))

{

assemblyBuilder = assemblyBuilders[assemblyName];

}

else

{

assemblyBuilder = domain.DefineDynamicAssembly(new AssemblyName(assemblyName),

AssemblyBuilderAccess.Run);

assemblyBuilders[assemblyName] = assemblyBuilder;

}

moduleBuilder = assemblyBuilder.DefineDynamicModule(moduleName);

moduleBuilders[Tuple.Create(assemblyName, moduleName)] = moduleBuilder;

}

return moduleBuilder;

}

/// <summary>

/// PythonDerivedType contains static methods used by the dynamically created

/// derived type that allow it to call back into python from overridden virtual

/// methods, and also handle the construction and destruction of the python

/// object.

/// </summary>

/// <remarks>

/// This has to be public as it's called from methods on dynamically built classes

/// potentially in other assemblies.

/// </remarks>

public class PythonDerivedType

{

/// <summary>

/// This is the implementation of the overridden methods in the derived

/// type. It looks for a python method with the same name as the method

/// on the managed base class and if it exists and isn't the managed

/// method binding (i.e. it has been overridden in the derived python

/// class) it calls it, otherwise it calls the base method.

/// </summary>

public static T InvokeMethod<T>(IPythonDerivedType obj, string methodName, string origMethodName, object[] args)

{

FieldInfo fi = obj.GetType().GetField("__pyobj__");

var self = (CLRObject)fi.GetValue(obj);

if (null != self)

{

var disposeList = new List<PyObject>();

IntPtr gs = Runtime.PyGILState_Ensure();

try

{

Runtime.XIncref(self.pyHandle);

var pyself = new PyObject(self.pyHandle);

disposeList.Add(pyself);

Runtime.XIncref(Runtime.PyNone);

var pynone = new PyObject(Runtime.PyNone);

disposeList.Add(pynone);

PyObject method = pyself.GetAttr(methodName, pynone);

disposeList.Add(method);

if (method.Handle != Runtime.PyNone)

{

// if the method hasn't been overridden then it will be a managed object

ManagedType managedMethod = ManagedType.GetManagedObject(method.Handle);

if (null == managedMethod)

{

var pyargs = new PyObject[args.Length];

for (var i = 0; i < args.Length; ++i)

{

pyargs[i] = new PyObject(Converter.ToPythonImplicit(args[i]));

disposeList.Add(pyargs[i]);

}

PyObject py_result = method.Invoke(pyargs);

disposeList.Add(py_result);

return (T)py_result.AsManagedObject(typeof(T));

}

finally

{

foreach (PyObject x in disposeList)

{

x?.Dispose();

}

Runtime.PyGILState_Release(gs);

}

if (origMethodName == null)

{

throw new NotImplementedException("Python object does not have a '" + methodName + "' method");

}

return (T)obj.GetType().InvokeMember(origMethodName,

BindingFlags.InvokeMethod,

null,

obj,

args);

}

public static void InvokeMethodVoid(IPythonDerivedType obj, string methodName, string origMethodName,

object[] args)

{

FieldInfo fi = obj.GetType().GetField("__pyobj__");

var self = (CLRObject)fi.GetValue(obj);

if (null != self)

{

var disposeList = new List<PyObject>();

IntPtr gs = Runtime.PyGILState_Ensure();

try

{

Runtime.XIncref(self.pyHandle);

var pyself = new PyObject(self.pyHandle);

disposeList.Add(pyself);

Runtime.XIncref(Runtime.PyNone);

var pynone = new PyObject(Runtime.PyNone);

disposeList.Add(pynone);

PyObject method = pyself.GetAttr(methodName, pynone);

disposeList.Add(method);

if (method.Handle != Runtime.PyNone)

{

// if the method hasn't been overridden then it will be a managed object

ManagedType managedMethod = ManagedType.GetManagedObject(method.Handle);

if (null == managedMethod)

{

var pyargs = new PyObject[args.Length];

for (var i = 0; i < args.Length; ++i)

{

pyargs[i] = new PyObject(Converter.ToPythonImplicit(args[i]));

disposeList.Add(pyargs[i]);

}

PyObject py_result = method.Invoke(pyargs);

disposeList.Add(py_result);

return;

}

finally

{

foreach (PyObject x in disposeList)

{

x?.Dispose();

}

Runtime.PyGILState_Release(gs);

}

if (origMethodName == null)

{

throw new NotImplementedException($"Python object does not have a '{methodName}' method");

}

obj.GetType().InvokeMember(origMethodName,

BindingFlags.InvokeMethod,

null,

obj,

args);

}

public static T InvokeGetProperty<T>(IPythonDerivedType obj, string propertyName)

{

FieldInfo fi = obj.GetType().GetField("__pyobj__");

var self = (CLRObject)fi.GetValue(obj);

if (null == self)

{

throw new NullReferenceException("Instance must be specified when getting a property");

}

IntPtr gs = Runtime.PyGILState_Ensure();

try

{

Runtime.XIncref(self.pyHandle);

using (var pyself = new PyObject(self.pyHandle))

using (PyObject pyvalue = pyself.GetAttr(propertyName))

{

return (T)pyvalue.AsManagedObject(typeof(T));

}

finally

{

Runtime.PyGILState_Release(gs);

}

public static void InvokeSetProperty<T>(IPythonDerivedType obj, string propertyName, T value)

{

FieldInfo fi = obj.GetType().GetField("__pyobj__");

var self = (CLRObject)fi.GetValue(obj);

if (null == self)

{

throw new NullReferenceException("Instance must be specified when setting a property");

}

IntPtr gs = Runtime.PyGILState_Ensure();

try

{

Runtime.XIncref(self.pyHandle);

using (var pyself = new PyObject(self.pyHandle))

using (var pyvalue = new PyObject(Converter.ToPythonImplicit(value)))

{

pyself.SetAttr(propertyName, pyvalue);

}

finally

{

Runtime.PyGILState_Release(gs);

}

public static void InvokeCtor(IPythonDerivedType obj, string origCtorName, object[] args)

{

// call the base constructor

obj.GetType().InvokeMember(origCtorName,

BindingFlags.InvokeMethod,

null,

obj,

args);

CLRObject self = null;

IntPtr gs = Runtime.PyGILState_Ensure();

try

{

// create the python object

IntPtr type = TypeManager.GetTypeHandle(obj.GetType());

self = new CLRObject(obj, type);

// set __pyobj__ to self and deref the python object which will allow this

// object to be collected.

FieldInfo fi = obj.GetType().GetField("__pyobj__");

fi.SetValue(obj, self);

}

finally

{

// Decrement the python object's reference count.

// This doesn't actually destroy the object, it just sets the reference to this object

// to be a weak reference and it will be destroyed when the C# object is destroyed.

if (null != self)

{

Runtime.XDecref(self.pyHandle);

}

Runtime.PyGILState_Release(gs);

}

public static void Finalize(IPythonDerivedType obj)

{

FieldInfo fi = obj.GetType().GetField("__pyobj__");

var self = (CLRObject)fi.GetValue(obj);

// If python's been terminated then just free the gchandle.

lock (Runtime.IsFinalizingLock)

{

if (0 == Runtime.Py_IsInitialized() || Runtime.IsFinalizing)

{

self.gcHandle.Free();

return;

}

// delete the python object in an async task as we may not be able to acquire

// the GIL immediately and we don't want to block the GC thread.

// FIXME: t isn't used

Task t = Task.Factory.StartNew(() =>

{

lock (Runtime.IsFinalizingLock)

{

// If python's been terminated then just free the gchandle.

if (0 == Runtime.Py_IsInitialized() || Runtime.IsFinalizing)

{

self.gcHandle.Free();

return;

}

IntPtr gs = Runtime.PyGILState_Ensure();

try

{

// the C# object is being destroyed which must mean there are no more

// references to the Python object as well so now we can dealloc the

// python object.

IntPtr dict = Marshal.ReadIntPtr(self.pyHandle, ObjectOffset.DictOffset(self.pyHandle));

if (dict != IntPtr.Zero)

{

Runtime.XDecref(dict);

}

Runtime.PyObject_GC_Del(self.pyHandle);

self.gcHandle.Free();

}

finally

{

Runtime.PyGILState_Release(gs);

}

});

}

pythonnet/src/runtime/classderived.cs at master · MITEM/pythonnet · GitHub

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