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try to use python.net as the bridge.
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qianlifeng
265
Pythonnet.Runtime/metatype.cs
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265
Pythonnet.Runtime/metatype.cs
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// ==========================================================================
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// This software is subject to the provisions of the Zope Public License,
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// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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// FOR A PARTICULAR PURPOSE.
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// ==========================================================================
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using System;
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using System.Runtime.InteropServices;
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using System.Collections;
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using System.Reflection;
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namespace Python.Runtime {
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//========================================================================
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// The managed metatype. This object implements the type of all reflected
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// types. It also provides support for single-inheritance from reflected
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// managed types.
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//========================================================================
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internal class MetaType : ManagedType {
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static IntPtr PyCLRMetaType;
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//====================================================================
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// Metatype initialization. This bootstraps the CLR metatype to life.
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//====================================================================
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public static IntPtr Initialize() {
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PyCLRMetaType = TypeManager.CreateMetaType(typeof(MetaType));
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return PyCLRMetaType;
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}
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//====================================================================
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// Metatype __new__ implementation. This is called to create a new
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// class / type when a reflected class is subclassed.
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//====================================================================
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public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw) {
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int len = Runtime.PyTuple_Size(args);
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if (len < 3) {
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return Exceptions.RaiseTypeError("invalid argument list");
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}
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//IntPtr name = Runtime.PyTuple_GetItem(args, 0);
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IntPtr bases = Runtime.PyTuple_GetItem(args, 1);
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IntPtr dict = Runtime.PyTuple_GetItem(args, 2);
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// We do not support multiple inheritance, so the bases argument
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// should be a 1-item tuple containing the type we are subtyping.
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// That type must itself have a managed implementation. We check
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// that by making sure its metatype is the CLR metatype.
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if (Runtime.PyTuple_Size(bases) != 1) {
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return Exceptions.RaiseTypeError(
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"cannot use multiple inheritance with managed classes"
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);
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}
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IntPtr base_type = Runtime.PyTuple_GetItem(bases, 0);
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IntPtr mt = Runtime.PyObject_TYPE(base_type);
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if (!((mt == PyCLRMetaType) || (mt == Runtime.PyTypeType))) {
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return Exceptions.RaiseTypeError("invalid metatype");
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}
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// Ensure that the reflected type is appropriate for subclassing,
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// disallowing subclassing of delegates, enums and array types.
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ClassBase cb = GetManagedObject(base_type) as ClassBase;
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if (cb != null) {
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if (! cb.CanSubclass() ) {
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return Exceptions.RaiseTypeError(
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"delegates, enums and array types cannot be subclassed"
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);
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}
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}
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IntPtr slots = Runtime.PyDict_GetItemString(dict, "__slots__");
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if (slots != IntPtr.Zero) {
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return Exceptions.RaiseTypeError(
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"subclasses of managed classes do not support __slots__"
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);
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}
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// hack for now... fix for 1.0
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//return TypeManager.CreateSubType(args);
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// right way
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IntPtr func = Marshal.ReadIntPtr(Runtime.PyTypeType,
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TypeOffset.tp_new);
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IntPtr type = NativeCall.Call_3(func, tp, args, kw);
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if (type == IntPtr.Zero) {
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return IntPtr.Zero;
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}
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int flags = TypeFlags.Default;
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flags |= TypeFlags.Managed;
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flags |= TypeFlags.HeapType;
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flags |= TypeFlags.BaseType;
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flags |= TypeFlags.Subclass;
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flags |= TypeFlags.HaveGC;
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Marshal.WriteIntPtr(type, TypeOffset.tp_flags, (IntPtr)flags);
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TypeManager.CopySlot(base_type, type, TypeOffset.tp_dealloc);
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// Hmm - the standard subtype_traverse, clear look at ob_size to
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// do things, so to allow gc to work correctly we need to move
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// our hidden handle out of ob_size. Then, in theory we can
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// comment this out and still not crash.
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TypeManager.CopySlot(base_type, type, TypeOffset.tp_traverse);
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TypeManager.CopySlot(base_type, type, TypeOffset.tp_clear);
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// for now, move up hidden handle...
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IntPtr gc = Marshal.ReadIntPtr(base_type, TypeOffset.magic());
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Marshal.WriteIntPtr(type, TypeOffset.magic(), gc);
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//DebugUtil.DumpType(base_type);
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//DebugUtil.DumpType(type);
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return type;
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}
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public static IntPtr tp_alloc(IntPtr mt, int n) {
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IntPtr type = Runtime.PyType_GenericAlloc(mt, n);
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return type;
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}
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public static void tp_free(IntPtr tp) {
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Runtime.PyObject_GC_Del(tp);
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}
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//====================================================================
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// Metatype __call__ implementation. This is needed to ensure correct
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// initialization (__init__ support), because the tp_call we inherit
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// from PyType_Type won't call __init__ for metatypes it doesnt know.
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//====================================================================
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public static IntPtr tp_call(IntPtr tp, IntPtr args, IntPtr kw) {
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IntPtr func = Marshal.ReadIntPtr(tp, TypeOffset.tp_new);
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if (func == IntPtr.Zero) {
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return Exceptions.RaiseTypeError("invalid object");
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}
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IntPtr obj = NativeCall.Call_3(func, tp, args, kw);
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if (obj == IntPtr.Zero) {
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return IntPtr.Zero;
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}
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IntPtr py__init__ = Runtime.PyString_FromString("__init__");
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IntPtr type = Runtime.PyObject_TYPE(obj);
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IntPtr init = Runtime._PyType_Lookup(type, py__init__);
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Runtime.Decref(py__init__);
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Runtime.PyErr_Clear();
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if (init != IntPtr.Zero) {
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IntPtr bound = Runtime.GetBoundArgTuple(obj, args);
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if (bound == IntPtr.Zero) {
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Runtime.Decref(obj);
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return IntPtr.Zero;
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}
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IntPtr result = Runtime.PyObject_Call(init, bound, kw);
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Runtime.Decref(bound);
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if (result == IntPtr.Zero) {
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Runtime.Decref(obj);
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return IntPtr.Zero;
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}
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Runtime.Decref(result);
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}
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return obj;
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}
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//====================================================================
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// Type __setattr__ implementation for reflected types. Note that this
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// is slightly different than the standard setattr implementation for
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// the normal Python metatype (PyTypeType). We need to look first in
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// the type object of a reflected type for a descriptor in order to
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// support the right setattr behavior for static fields and properties.
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//====================================================================
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public static int tp_setattro(IntPtr tp, IntPtr name, IntPtr value) {
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IntPtr descr = Runtime._PyType_Lookup(tp, name);
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if (descr != IntPtr.Zero) {
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IntPtr dt = Runtime.PyObject_TYPE(descr);
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IntPtr fp = Marshal.ReadIntPtr(dt, TypeOffset.tp_descr_set);
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if (fp != IntPtr.Zero) {
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return NativeCall.Impl.Int_Call_3(fp, descr, name, value);
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}
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Exceptions.SetError(Exceptions.AttributeError,
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"attribute is read-only");
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return -1;
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}
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if (Runtime.PyObject_GenericSetAttr(tp, name, value) < 0) {
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return -1;
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}
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return 0;
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}
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//====================================================================
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// The metatype has to implement [] semantics for generic types, so
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// here we just delegate to the generic type def implementation. Its
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// own mp_subscript
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//====================================================================
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public static IntPtr mp_subscript(IntPtr tp, IntPtr idx) {
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ClassBase cb = GetManagedObject(tp) as ClassBase;
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if (cb != null) {
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return cb.type_subscript(idx);
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}
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return Exceptions.RaiseTypeError("unsubscriptable object");
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}
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//====================================================================
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// Dealloc implementation. This is called when a Python type generated
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// by this metatype is no longer referenced from the Python runtime.
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//====================================================================
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public static void tp_dealloc(IntPtr tp) {
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// Fix this when we dont cheat on the handle for subclasses!
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int flags = (int)Marshal.ReadIntPtr(tp, TypeOffset.tp_flags);
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if ((flags & TypeFlags.Subclass) == 0) {
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IntPtr gc = Marshal.ReadIntPtr(tp, TypeOffset.magic());
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((GCHandle)gc).Free();
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}
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IntPtr op = Marshal.ReadIntPtr(tp, TypeOffset.ob_type);
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Runtime.Decref(op);
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// Delegate the rest of finalization the Python metatype. Note
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// that the PyType_Type implementation of tp_dealloc will call
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// tp_free on the type of the type being deallocated - in this
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// case our CLR metatype. That is why we implement tp_free.
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op = Marshal.ReadIntPtr(Runtime.PyTypeType, TypeOffset.tp_dealloc);
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NativeCall.Void_Call_1(op, tp);
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return;
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}
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}
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}
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