This repository was archived by the owner on Jul 22, 2023. It is now read-only.
forked from pythonnet/pythonnet
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathtypemanager.cs
More file actions
539 lines (439 loc) · 20.5 KB
/
typemanager.cs
File metadata and controls
539 lines (439 loc) · 20.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.InteropServices;
namespace Python.Runtime
{
/// <summary>
/// The TypeManager class is responsible for building binary-compatible
/// Python type objects that are implemented in managed code.
/// </summary>
internal class TypeManager
{
private static BindingFlags tbFlags;
private static Dictionary<Type, IntPtr> cache;
static TypeManager()
{
tbFlags = BindingFlags.Public | BindingFlags.Static;
cache = new Dictionary<Type, IntPtr>(128);
}
/// <summary>
/// Given a managed Type derived from ExtensionType, get the handle to
/// a Python type object that delegates its implementation to the Type
/// object. These Python type instances are used to implement internal
/// descriptor and utility types like ModuleObject, PropertyObject, etc.
/// </summary>
internal static IntPtr GetTypeHandle(Type type)
{
// Note that these types are cached with a refcount of 1, so they
// effectively exist until the CPython runtime is finalized.
IntPtr handle;
cache.TryGetValue(type, out handle);
if (handle != IntPtr.Zero)
{
return handle;
}
handle = CreateType(type);
cache[type] = handle;
return handle;
}
/// <summary>
/// Get the handle of a Python type that reflects the given CLR type.
/// The given ManagedType instance is a managed object that implements
/// the appropriate semantics in Python for the reflected managed type.
/// </summary>
internal static IntPtr GetTypeHandle(ManagedType obj, Type type)
{
IntPtr handle;
cache.TryGetValue(type, out handle);
if (handle != IntPtr.Zero)
{
return handle;
}
handle = CreateType(obj, type);
cache[type] = handle;
return handle;
}
/// <summary>
/// The following CreateType implementations do the necessary work to
/// create Python types to represent managed extension types, reflected
/// types, subclasses of reflected types and the managed metatype. The
/// dance is slightly different for each kind of type due to different
/// behavior needed and the desire to have the existing Python runtime
/// do as much of the allocation and initialization work as possible.
/// </summary>
internal static IntPtr CreateType(Type impl)
{
IntPtr type = AllocateTypeObject(impl.Name);
int ob_size = ObjectOffset.Size(type);
// Set tp_basicsize to the size of our managed instance objects.
Marshal.WriteIntPtr(type, TypeOffset.tp_basicsize, (IntPtr)ob_size);
var offset = (IntPtr)ObjectOffset.DictOffset(type);
Marshal.WriteIntPtr(type, TypeOffset.tp_dictoffset, offset);
InitializeSlots(type, impl);
int flags = TypeFlags.Default | TypeFlags.Managed |
TypeFlags.HeapType | TypeFlags.HaveGC;
Marshal.WriteIntPtr(type, TypeOffset.tp_flags, (IntPtr)flags);
Runtime.PyType_Ready(type);
IntPtr dict = Marshal.ReadIntPtr(type, TypeOffset.tp_dict);
IntPtr mod = Runtime.PyString_FromString("CLR");
Runtime.PyDict_SetItemString(dict, "__module__", mod);
InitMethods(type, impl);
return type;
}
internal static IntPtr CreateType(ManagedType impl, Type clrType)
{
// Cleanup the type name to get rid of funny nested type names.
string name = "CLR." + clrType.FullName;
int i = name.LastIndexOf('+');
if (i > -1)
{
name = name.Substring(i + 1);
}
i = name.LastIndexOf('.');
if (i > -1)
{
name = name.Substring(i + 1);
}
IntPtr base_ = IntPtr.Zero;
int ob_size = ObjectOffset.Size(Runtime.PyTypeType);
int tp_dictoffset = ObjectOffset.DictOffset(Runtime.PyTypeType);
// XXX Hack, use a different base class for System.Exception
// Python 2.5+ allows new style class exceptions but they *must*
// subclass BaseException (or better Exception).
if (typeof(Exception).IsAssignableFrom(clrType))
{
ob_size = ObjectOffset.Size(Exceptions.Exception);
tp_dictoffset = ObjectOffset.DictOffset(Exceptions.Exception);
}
if (clrType == typeof(Exception))
{
base_ = Exceptions.Exception;
}
else if (clrType.BaseType != null)
{
ClassBase bc = ClassManager.GetClass(clrType.BaseType);
base_ = bc.pyHandle;
}
IntPtr type = AllocateTypeObject(name);
Marshal.WriteIntPtr(type, TypeOffset.ob_type, Runtime.PyCLRMetaType);
Runtime.XIncref(Runtime.PyCLRMetaType);
Marshal.WriteIntPtr(type, TypeOffset.tp_basicsize, (IntPtr)ob_size);
Marshal.WriteIntPtr(type, TypeOffset.tp_itemsize, IntPtr.Zero);
Marshal.WriteIntPtr(type, TypeOffset.tp_dictoffset, (IntPtr)tp_dictoffset);
InitializeSlots(type, impl.GetType());
if (base_ != IntPtr.Zero)
{
Marshal.WriteIntPtr(type, TypeOffset.tp_base, base_);
Runtime.XIncref(base_);
}
int flags = TypeFlags.Default;
flags |= TypeFlags.Managed;
flags |= TypeFlags.HeapType;
flags |= TypeFlags.BaseType;
flags |= TypeFlags.HaveGC;
Marshal.WriteIntPtr(type, TypeOffset.tp_flags, (IntPtr)flags);
// Leverage followup initialization from the Python runtime. Note
// that the type of the new type must PyType_Type at the time we
// call this, else PyType_Ready will skip some slot initialization.
Runtime.PyType_Ready(type);
IntPtr dict = Marshal.ReadIntPtr(type, TypeOffset.tp_dict);
string mn = clrType.Namespace ?? "";
IntPtr mod = Runtime.PyString_FromString(mn);
Runtime.PyDict_SetItemString(dict, "__module__", mod);
// Hide the gchandle of the implementation in a magic type slot.
GCHandle gc = GCHandle.Alloc(impl);
Marshal.WriteIntPtr(type, TypeOffset.magic(), (IntPtr)gc);
// Set the handle attributes on the implementing instance.
impl.tpHandle = Runtime.PyCLRMetaType;
impl.gcHandle = gc;
impl.pyHandle = type;
//DebugUtil.DumpType(type);
return type;
}
internal static IntPtr CreateSubType(IntPtr py_name, IntPtr py_base_type, IntPtr py_dict)
{
// Utility to create a subtype of a managed type with the ability for the
// a python subtype able to override the managed implementation
string name = Runtime.GetManagedString(py_name);
// the derived class can have class attributes __assembly__ and __module__ which
// control the name of the assembly and module the new type is created in.
object assembly = null;
object namespaceStr = null;
var disposeList = new List<PyObject>();
try
{
var assemblyKey = new PyObject(Converter.ToPython("__assembly__", typeof(string)));
disposeList.Add(assemblyKey);
if (0 != Runtime.PyMapping_HasKey(py_dict, assemblyKey.Handle))
{
var pyAssembly = new PyObject(Runtime.PyDict_GetItem(py_dict, assemblyKey.Handle));
disposeList.Add(pyAssembly);
if (!Converter.ToManagedValue(pyAssembly.Handle, typeof(string), out assembly, false))
{
throw new InvalidCastException("Couldn't convert __assembly__ value to string");
}
}
var namespaceKey = new PyObject(Converter.ToPythonImplicit("__namespace__"));
disposeList.Add(namespaceKey);
if (0 != Runtime.PyMapping_HasKey(py_dict, namespaceKey.Handle))
{
var pyNamespace = new PyObject(Runtime.PyDict_GetItem(py_dict, namespaceKey.Handle));
disposeList.Add(pyNamespace);
if (!Converter.ToManagedValue(pyNamespace.Handle, typeof(string), out namespaceStr, false))
{
throw new InvalidCastException("Couldn't convert __namespace__ value to string");
}
}
}
finally
{
foreach (PyObject o in disposeList)
{
o.Dispose();
}
}
// create the new managed type subclassing the base managed type
var baseClass = ManagedType.GetManagedObject(py_base_type) as ClassBase;
if (null == baseClass)
{
return Exceptions.RaiseTypeError("invalid base class, expected CLR class type");
}
try
{
Type subType = ClassDerivedObject.CreateDerivedType(name,
baseClass.type,
py_dict,
(string)namespaceStr,
(string)assembly);
// create the new ManagedType and python type
ClassBase subClass = ClassManager.GetClass(subType);
IntPtr py_type = GetTypeHandle(subClass, subType);
// by default the class dict will have all the C# methods in it, but as this is a
// derived class we want the python overrides in there instead if they exist.
IntPtr cls_dict = Marshal.ReadIntPtr(py_type, TypeOffset.tp_dict);
Runtime.PyDict_Update(cls_dict, py_dict);
return py_type;
}
catch (Exception e)
{
return Exceptions.RaiseTypeError(e.Message);
}
}
internal static IntPtr WriteMethodDef(IntPtr mdef, IntPtr name, IntPtr func, int flags, IntPtr doc)
{
Marshal.WriteIntPtr(mdef, name);
Marshal.WriteIntPtr(mdef, 1 * IntPtr.Size, func);
Marshal.WriteInt32(mdef, 2 * IntPtr.Size, flags);
Marshal.WriteIntPtr(mdef, 3 * IntPtr.Size, doc);
return mdef + 4 * IntPtr.Size;
}
internal static IntPtr WriteMethodDef(IntPtr mdef, string name, IntPtr func, int flags = 0x0001,
string doc = null)
{
IntPtr namePtr = Marshal.StringToHGlobalAnsi(name);
IntPtr docPtr = doc != null ? Marshal.StringToHGlobalAnsi(doc) : IntPtr.Zero;
return WriteMethodDef(mdef, namePtr, func, flags, docPtr);
}
internal static IntPtr WriteMethodDefSentinel(IntPtr mdef)
{
return WriteMethodDef(mdef, IntPtr.Zero, IntPtr.Zero, 0, IntPtr.Zero);
}
internal static IntPtr CreateMetaType(Type impl)
{
// The managed metatype is functionally little different than the
// standard Python metatype (PyType_Type). It overrides certain of
// the standard type slots, and has to subclass PyType_Type for
// certain functions in the C runtime to work correctly with it.
IntPtr type = AllocateTypeObject("CLR Metatype");
IntPtr py_type = Runtime.PyTypeType;
Marshal.WriteIntPtr(type, TypeOffset.tp_base, py_type);
Runtime.XIncref(py_type);
// Copy gc and other type slots from the base Python metatype.
CopySlot(py_type, type, TypeOffset.tp_basicsize);
CopySlot(py_type, type, TypeOffset.tp_itemsize);
CopySlot(py_type, type, TypeOffset.tp_dictoffset);
CopySlot(py_type, type, TypeOffset.tp_weaklistoffset);
CopySlot(py_type, type, TypeOffset.tp_traverse);
CopySlot(py_type, type, TypeOffset.tp_clear);
CopySlot(py_type, type, TypeOffset.tp_is_gc);
// Override type slots with those of the managed implementation.
InitializeSlots(type, impl);
int flags = TypeFlags.Default;
flags |= TypeFlags.Managed;
flags |= TypeFlags.HeapType;
flags |= TypeFlags.HaveGC;
Marshal.WriteIntPtr(type, TypeOffset.tp_flags, (IntPtr)flags);
// We need space for 3 PyMethodDef structs, each of them
// 4 int-ptrs in size.
IntPtr mdef = Runtime.PyMem_Malloc(3 * 4 * IntPtr.Size);
IntPtr mdefStart = mdef;
mdef = WriteMethodDef(
mdef,
"__instancecheck__",
Interop.GetThunk(typeof(MetaType).GetMethod("__instancecheck__"), "BinaryFunc")
);
mdef = WriteMethodDef(
mdef,
"__subclasscheck__",
Interop.GetThunk(typeof(MetaType).GetMethod("__subclasscheck__"), "BinaryFunc")
);
// FIXME: mdef is not used
mdef = WriteMethodDefSentinel(mdef);
Marshal.WriteIntPtr(type, TypeOffset.tp_methods, mdefStart);
Runtime.PyType_Ready(type);
IntPtr dict = Marshal.ReadIntPtr(type, TypeOffset.tp_dict);
IntPtr mod = Runtime.PyString_FromString("CLR");
Runtime.PyDict_SetItemString(dict, "__module__", mod);
//DebugUtil.DumpType(type);
return type;
}
internal static IntPtr BasicSubType(string name, IntPtr base_, Type impl)
{
// Utility to create a subtype of a std Python type, but with
// a managed type able to override implementation
IntPtr type = AllocateTypeObject(name);
//Marshal.WriteIntPtr(type, TypeOffset.tp_basicsize, (IntPtr)obSize);
//Marshal.WriteIntPtr(type, TypeOffset.tp_itemsize, IntPtr.Zero);
//IntPtr offset = (IntPtr)ObjectOffset.ob_dict;
//Marshal.WriteIntPtr(type, TypeOffset.tp_dictoffset, offset);
//IntPtr dc = Runtime.PyDict_Copy(dict);
//Marshal.WriteIntPtr(type, TypeOffset.tp_dict, dc);
Marshal.WriteIntPtr(type, TypeOffset.tp_base, base_);
Runtime.XIncref(base_);
int flags = TypeFlags.Default;
flags |= TypeFlags.Managed;
flags |= TypeFlags.HeapType;
flags |= TypeFlags.HaveGC;
Marshal.WriteIntPtr(type, TypeOffset.tp_flags, (IntPtr)flags);
CopySlot(base_, type, TypeOffset.tp_traverse);
CopySlot(base_, type, TypeOffset.tp_clear);
CopySlot(base_, type, TypeOffset.tp_is_gc);
InitializeSlots(type, impl);
Runtime.PyType_Ready(type);
IntPtr tp_dict = Marshal.ReadIntPtr(type, TypeOffset.tp_dict);
IntPtr mod = Runtime.PyString_FromString("CLR");
Runtime.PyDict_SetItemString(tp_dict, "__module__", mod);
return type;
}
/// <summary>
/// Utility method to allocate a type object & do basic initialization.
/// </summary>
internal static IntPtr AllocateTypeObject(string name)
{
IntPtr type = Runtime.PyType_GenericAlloc(Runtime.PyTypeType, 0);
// Cheat a little: we'll set tp_name to the internal char * of
// the Python version of the type name - otherwise we'd have to
// allocate the tp_name and would have no way to free it.
#if PYTHON3
// For python3 we leak two objects. One for the ASCII representation
// required for tp_name, and another for the Unicode representation
// for ht_name.
IntPtr temp = Runtime.PyBytes_FromString(name);
IntPtr raw = Runtime.PyBytes_AS_STRING(temp);
temp = Runtime.PyUnicode_FromString(name);
#elif PYTHON2
IntPtr temp = Runtime.PyString_FromString(name);
IntPtr raw = Runtime.PyString_AsString(temp);
#endif
Marshal.WriteIntPtr(type, TypeOffset.tp_name, raw);
Marshal.WriteIntPtr(type, TypeOffset.name, temp);
#if PYTHON3
Marshal.WriteIntPtr(type, TypeOffset.qualname, temp);
#endif
long ptr = type.ToInt64(); // 64-bit safe
temp = new IntPtr(ptr + TypeOffset.nb_add);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_number, temp);
temp = new IntPtr(ptr + TypeOffset.sq_length);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_sequence, temp);
temp = new IntPtr(ptr + TypeOffset.mp_length);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_mapping, temp);
#if PYTHON3
temp = new IntPtr(ptr + TypeOffset.bf_getbuffer);
#elif PYTHON2
temp = new IntPtr(ptr + TypeOffset.bf_getreadbuffer);
#endif
Marshal.WriteIntPtr(type, TypeOffset.tp_as_buffer, temp);
return type;
}
/// <summary>
/// Given a newly allocated Python type object and a managed Type that
/// provides the implementation for the type, connect the type slots of
/// the Python object to the managed methods of the implementing Type.
/// </summary>
internal static void InitializeSlots(IntPtr type, Type impl)
{
var seen = new Hashtable(8);
Type offsetType = typeof(TypeOffset);
while (impl != null)
{
MethodInfo[] methods = impl.GetMethods(tbFlags);
foreach (MethodInfo method in methods)
{
string name = method.Name;
if (!(name.StartsWith("tp_") ||
name.StartsWith("nb_") ||
name.StartsWith("sq_") ||
name.StartsWith("mp_") ||
name.StartsWith("bf_")
))
{
continue;
}
if (seen[name] != null)
{
continue;
}
FieldInfo fi = offsetType.GetField(name);
var offset = (int)fi.GetValue(offsetType);
IntPtr slot = Interop.GetThunk(method);
Marshal.WriteIntPtr(type, offset, slot);
seen[name] = 1;
}
impl = impl.BaseType;
}
}
/// <summary>
/// Given a newly allocated Python type object and a managed Type that
/// implements it, initialize any methods defined by the Type that need
/// to appear in the Python type __dict__ (based on custom attribute).
/// </summary>
private static void InitMethods(IntPtr pytype, Type type)
{
IntPtr dict = Marshal.ReadIntPtr(pytype, TypeOffset.tp_dict);
Type marker = typeof(PythonMethodAttribute);
BindingFlags flags = BindingFlags.Public | BindingFlags.Static;
var addedMethods = new HashSet<string>();
while (type != null)
{
MethodInfo[] methods = type.GetMethods(flags);
foreach (MethodInfo method in methods)
{
if (!addedMethods.Contains(method.Name))
{
object[] attrs = method.GetCustomAttributes(marker, false);
if (attrs.Length > 0)
{
string method_name = method.Name;
var mi = new MethodInfo[1];
mi[0] = method;
MethodObject m = new TypeMethod(type, method_name, mi);
Runtime.PyDict_SetItemString(dict, method_name, m.pyHandle);
addedMethods.Add(method_name);
}
}
}
type = type.BaseType;
}
}
/// <summary>
/// Utility method to copy slots from a given type to another type.
/// </summary>
internal static void CopySlot(IntPtr from, IntPtr to, int offset)
{
IntPtr fp = Marshal.ReadIntPtr(from, offset);
Marshal.WriteIntPtr(to, offset, fp);
}
}
}