Repository navigation
Expand file tree
/
Copy pathclassmanager.cs
More file actions
403 lines (347 loc) · 14.3 KB
/
Copy pathclassmanager.cs
File metadata and controls
403 lines (347 loc) · 14.3 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
using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Security;
namespace Python.Runtime
{
/// <summary>
/// The ClassManager is responsible for creating and managing instances
/// that implement the Python type objects that reflect managed classes.
/// Each managed type reflected to Python is represented by an instance
/// of a concrete subclass of ClassBase. Each instance is associated with
/// a generated Python type object, whose slots point to static methods
/// of the managed instance's class.
/// </summary>
internal class ClassManager
{
private static Dictionary<Type, ClassBase> cache;
private static Type dtype;
private ClassManager()
{
}
static ClassManager()
{
cache = new Dictionary<Type, ClassBase>(128);
// SEE: https://msdn.microsoft.com/en-us/library/96b1ayy4(v=vs.100).aspx
// ""All delegates inherit from MulticastDelegate, which inherits from Delegate.""
// Was Delegate, which caused a null MethodInfo returned from GetMethode("Invoke")
// and crashed on Linux under Mono.
dtype = typeof(MulticastDelegate);
}
/// <summary>
/// Return the ClassBase-derived instance that implements a particular
/// reflected managed type, creating it if it doesn't yet exist.
/// </summary>
internal static ClassBase GetClass(Type type)
{
ClassBase cb = null;
cache.TryGetValue(type, out cb);
if (cb != null)
{
return cb;
}
cb = CreateClass(type);
cache.Add(type, cb);
// Initialize the object later, as this might call this GetClass method
// recursively (for example when a nested class inherits its declaring class...)
InitClassBase(type, cb);
return cb;
}
/// <summary>
/// Create a new ClassBase-derived instance that implements a reflected
/// managed type. The new object will be associated with a generated
/// Python type object.
/// </summary>
private static ClassBase CreateClass(Type type)
{
// Next, select the appropriate managed implementation class.
// Different kinds of types, such as array types or interface
// types, want to vary certain implementation details to make
// sure that the type semantics are consistent in Python.
ClassBase impl;
// Check to see if the given type extends System.Exception. This
// lets us check once (vs. on every lookup) in case we need to
// wrap Exception-derived types in old-style classes
if (type.ContainsGenericParameters)
{
impl = new GenericType(type);
}
else if (type.IsSubclassOf(dtype))
{
impl = new DelegateObject(type);
}
else if (type.IsArray)
{
impl = new ArrayObject(type);
}
else if (type.IsInterface)
{
impl = new InterfaceObject(type);
}
else if (type == typeof(Exception) ||
type.IsSubclassOf(typeof(Exception)))
{
impl = new ExceptionClassObject(type);
}
else if (null != type.GetField("__pyobj__"))
{
impl = new ClassDerivedObject(type);
}
else
{
impl = new ClassObject(type);
}
return impl;
}
private static void InitClassBase(Type type, ClassBase impl)
{
// First, we introspect the managed type and build some class
// information, including generating the member descriptors
// that we'll be putting in the Python class __dict__.
ClassInfo info = GetClassInfo(type);
impl.indexer = info.indexer;
// Now we allocate the Python type object to reflect the given
// managed type, filling the Python type slots with thunks that
// point to the managed methods providing the implementation.
IntPtr tp = TypeManager.GetTypeHandle(impl, type);
impl.tpHandle = tp;
// Finally, initialize the class __dict__ and return the object.
IntPtr dict = Marshal.ReadIntPtr(tp, TypeOffset.tp_dict);
IDictionaryEnumerator iter = info.members.GetEnumerator();
while (iter.MoveNext())
{
var item = (ManagedType)iter.Value;
var name = (string)iter.Key;
Runtime.PyDict_SetItemString(dict, name, item.pyHandle);
}
// If class has constructors, generate an __doc__ attribute.
IntPtr doc = IntPtr.Zero;
Type marker = typeof(DocStringAttribute);
var attrs = (Attribute[])type.GetCustomAttributes(marker, false);
if (attrs.Length == 0)
{
doc = IntPtr.Zero;
}
else
{
var attr = (DocStringAttribute)attrs[0];
string docStr = attr.DocString;
doc = Runtime.PyString_FromString(docStr);
Runtime.PyDict_SetItemString(dict, "__doc__", doc);
Runtime.XDecref(doc);
}
var co = impl as ClassObject;
// If this is a ClassObject AND it has constructors, generate a __doc__ attribute.
// required that the ClassObject.ctors be changed to internal
if (co != null)
{
if (co.ctors.Length > 0)
{
// Implement Overloads on the class object
if (!CLRModule._SuppressOverloads)
{
var ctors = new ConstructorBinding(type, tp, co.binder);
// ExtensionType types are untracked, so don't Incref() them.
// TODO: deprecate __overloads__ soon...
Runtime.PyDict_SetItemString(dict, "__overloads__", ctors.pyHandle);
Runtime.PyDict_SetItemString(dict, "Overloads", ctors.pyHandle);
}
// don't generate the docstring if one was already set from a DocStringAttribute.
if (!CLRModule._SuppressDocs && doc == IntPtr.Zero)
{
doc = co.GetDocString();
Runtime.PyDict_SetItemString(dict, "__doc__", doc);
Runtime.XDecref(doc);
}
}
}
}
private static ClassInfo GetClassInfo(Type type)
{
var ci = new ClassInfo(type);
var methods = new Hashtable();
ArrayList list;
MethodInfo meth;
ManagedType ob;
string name;
object item;
Type tp;
int i, n;
// This is complicated because inheritance in Python is name
// based. We can't just find DeclaredOnly members, because we
// could have a base class A that defines two overloads of a
// method and a class B that defines two more. The name-based
// descriptor Python will find needs to know about inherited
// overloads as well as those declared on the sub class.
BindingFlags flags = BindingFlags.Static |
BindingFlags.Instance |
BindingFlags.Public |
BindingFlags.NonPublic;
MemberInfo[] info = type.GetMembers(flags);
var local = new Hashtable();
var items = new ArrayList();
MemberInfo m;
// Loop through once to find out which names are declared
for (i = 0; i < info.Length; i++)
{
m = info[i];
if (m.DeclaringType == type)
{
local[m.Name] = 1;
}
}
// Now again to filter w/o losing overloaded member info
for (i = 0; i < info.Length; i++)
{
m = info[i];
if (local[m.Name] != null)
{
items.Add(m);
}
}
if (type.IsInterface)
{
// Interface inheritance seems to be a different animal:
// more contractual, less structural. Thus, a Type that
// represents an interface that inherits from another
// interface does not return the inherited interface's
// methods in GetMembers. For example ICollection inherits
// from IEnumerable, but ICollection's GetMemebers does not
// return GetEnumerator.
//
// Not sure if this is the correct way to fix this, but it
// seems to work. Thanks to Bruce Dodson for the fix.
Type[] inheritedInterfaces = type.GetInterfaces();
for (i = 0; i < inheritedInterfaces.Length; ++i)
{
Type inheritedType = inheritedInterfaces[i];
MemberInfo[] imembers = inheritedType.GetMembers(flags);
for (n = 0; n < imembers.Length; n++)
{
m = imembers[n];
if (local[m.Name] == null)
{
items.Add(m);
}
}
}
}
for (i = 0; i < items.Count; i++)
{
var mi = (MemberInfo)items[i];
switch (mi.MemberType)
{
case MemberTypes.Method:
meth = (MethodInfo)mi;
if (!(meth.IsPublic || meth.IsFamily ||
meth.IsFamilyOrAssembly))
{
continue;
}
name = meth.Name;
item = methods[name];
if (item == null)
{
item = methods[name] = new ArrayList();
}
list = (ArrayList)item;
list.Add(meth);
continue;
case MemberTypes.Property:
var pi = (PropertyInfo)mi;
MethodInfo mm = null;
try
{
mm = pi.GetGetMethod(true);
if (mm == null)
{
mm = pi.GetSetMethod(true);
}
}
catch (SecurityException)
{
// GetGetMethod may try to get a method protected by
// StrongNameIdentityPermission - effectively private.
continue;
}
if (mm == null)
{
continue;
}
if (!(mm.IsPublic || mm.IsFamily || mm.IsFamilyOrAssembly))
{
continue;
}
// Check for indexer
ParameterInfo[] args = pi.GetIndexParameters();
if (args.GetLength(0) > 0)
{
Indexer idx = ci.indexer;
if (idx == null)
{
ci.indexer = new Indexer();
idx = ci.indexer;
}
idx.AddProperty(pi);
continue;
}
ob = new PropertyObject(pi);
ci.members[pi.Name] = ob;
continue;
case MemberTypes.Field:
var fi = (FieldInfo)mi;
if (!(fi.IsPublic || fi.IsFamily || fi.IsFamilyOrAssembly))
{
continue;
}
ob = new FieldObject(fi);
ci.members[mi.Name] = ob;
continue;
case MemberTypes.Event:
var ei = (EventInfo)mi;
MethodInfo me = ei.GetAddMethod(true);
if (!(me.IsPublic || me.IsFamily || me.IsFamilyOrAssembly))
{
continue;
}
ob = new EventObject(ei);
ci.members[ei.Name] = ob;
continue;
case MemberTypes.NestedType:
tp = (Type)mi;
if (!(tp.IsNestedPublic || tp.IsNestedFamily ||
tp.IsNestedFamORAssem))
{
continue;
}
// Note the given instance might be uninitialized
ob = GetClass(tp);
ci.members[mi.Name] = ob;
continue;
}
}
IDictionaryEnumerator iter = methods.GetEnumerator();
while (iter.MoveNext())
{
name = (string)iter.Key;
list = (ArrayList)iter.Value;
var mlist = (MethodInfo[])list.ToArray(typeof(MethodInfo));
ob = new MethodObject(type, name, mlist);
ci.members[name] = ob;
}
return ci;
}
}
internal class ClassInfo
{
public Indexer indexer;
public Hashtable members;
internal ClassInfo(Type t)
{
members = new Hashtable();
indexer = null;
}
}
}