FazBrowse GitHub Viewer
|
Trending
|
URL:
|
Home
Tools:
[Download Repo ZIP]
[View Raw Code]
[Original HTTPS Page]
pythonnet/pythonnet/src/runtime/delegatemanager.cs at develop · davidanthoff/pythonnet · GitHub
davidanthoff
pythonnet
Repository navigation
Code
Pull requests
Actions
Projects
Security and quality
Insights
Expand file tree
Breadcrumbs
pythonnet
/
pythonnet
/
src
/
runtime
/
delegatemanager.cs
Copy path
More file actions
More file actions
Latest commit
History
History
History
289 lines (227 loc) · 10.4 KB
Breadcrumbs
pythonnet
/
pythonnet
/
src
/
runtime
/
delegatemanager.cs
Copy path
File metadata and controls
289 lines (227 loc) · 10.4 KB
Raw
Copy raw file
Download raw file
Open symbols panel
Edit and raw actions
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
// ==========================================================================
// This software is subject to the provisions of the Zope Public License,
// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
// FOR A PARTICULAR PURPOSE.
// ==========================================================================
using
System
;
using
System
.
Threading
;
using
System
.
Runtime
.
InteropServices
;
using
System
.
Runtime
.
CompilerServices
;
using
System
.
Collections
;
using
System
.
Reflection
;
using
System
.
Reflection
.
Emit
;
namespace
Python
.
Runtime
{
/// <summary>
/// The DelegateManager class manages the creation of true managed
/// delegate instances that dispatch calls to Python methods.
/// </summary>
internal
class
DelegateManager
{
Hashtable
cache
;
Type
basetype
;
Type
listtype
;
Type
voidtype
;
Type
typetype
;
Type
ptrtype
;
CodeGenerator
codeGenerator
;
public
DelegateManager
(
)
{
basetype
=
typeof
(
Dispatcher
)
;
listtype
=
typeof
(
ArrayList
)
;
voidtype
=
typeof
(
void
)
;
typetype
=
typeof
(
Type
)
;
ptrtype
=
typeof
(
IntPtr
)
;
cache
=
new
Hashtable
(
)
;
codeGenerator
=
new
CodeGenerator
(
)
;
}
//====================================================================
// Given a true delegate instance, return the PyObject handle of the
// Python object implementing the delegate (or IntPtr.Zero if the
// delegate is not implemented in Python code.
//====================================================================
public
IntPtr
GetPythonHandle
(
Delegate
d
)
{
if
(
(
d
!=
null
)
&&
(
d
.
Target
is
Dispatcher
)
)
{
Dispatcher
disp
=
d
.
Target
as
Dispatcher
;
return
disp
.
target
;
}
return
IntPtr
.
Zero
;
}
//====================================================================
// GetDispatcher is responsible for creating a class that provides
// an appropriate managed callback method for a given delegate type.
//====================================================================
private
Type
GetDispatcher
(
Type
dtype
)
{
// If a dispatcher type for the given delegate type has already
// been generated, get it from the cache. The cache maps delegate
// types to generated dispatcher types. A possible optimization
// for the future would be to generate dispatcher types based on
// unique signatures rather than delegate types, since multiple
// delegate types with the same sig could use the same dispatcher.
Object
item
=
cache
[
dtype
]
;
if
(
item
!=
null
)
{
return
(
Type
)
item
;
}
string
name
=
"__"
+
dtype
.
FullName
+
"Dispatcher"
;
name
=
name
.
Replace
(
'.'
,
'_'
)
;
name
=
name
.
Replace
(
'+'
,
'_'
)
;
TypeBuilder
tb
=
codeGenerator
.
DefineType
(
name
,
basetype
)
;
// Generate a constructor for the generated type that calls the
// appropriate constructor of the Dispatcher base type.
MethodAttributes
ma
=
MethodAttributes
.
Public
|
MethodAttributes
.
HideBySig
|
MethodAttributes
.
SpecialName
|
MethodAttributes
.
RTSpecialName
;
CallingConventions
cc
=
CallingConventions
.
Standard
;
Type
[
]
args
=
{
ptrtype
,
typetype
}
;
ConstructorBuilder
cb
=
tb
.
DefineConstructor
(
ma
,
cc
,
args
)
;
ConstructorInfo
ci
=
basetype
.
GetConstructor
(
args
)
;
ILGenerator
il
=
cb
.
GetILGenerator
(
)
;
il
.
Emit
(
OpCodes
.
Ldarg_0
)
;
il
.
Emit
(
OpCodes
.
Ldarg_1
)
;
il
.
Emit
(
OpCodes
.
Ldarg_2
)
;
il
.
Emit
(
OpCodes
.
Call
,
ci
)
;
il
.
Emit
(
OpCodes
.
Ret
)
;
// Method generation: we generate a method named "Invoke" on the
// dispatcher type, whose signature matches the delegate type for
// which it is generated. The method body simply packages the
// arguments and hands them to the Dispatch() method, which deals
// with converting the arguments, calling the Python method and
// converting the result of the call.
MethodInfo
method
=
dtype
.
GetMethod
(
"Invoke"
)
;
ParameterInfo
[
]
pi
=
method
.
GetParameters
(
)
;
Type
[
]
signature
=
new
Type
[
pi
.
Length
]
;
for
(
int
i
=
0
;
i
<
pi
.
Length
;
i
++
)
{
signature
[
i
]
=
pi
[
i
]
.
ParameterType
;
}
MethodBuilder
mb
=
tb
.
DefineMethod
(
"Invoke"
,
MethodAttributes
.
Public
,
method
.
ReturnType
,
signature
)
;
ConstructorInfo
ctor
=
listtype
.
GetConstructor
(
Type
.
EmptyTypes
)
;
MethodInfo
dispatch
=
basetype
.
GetMethod
(
"Dispatch"
)
;
MethodInfo
add
=
listtype
.
GetMethod
(
"Add"
)
;
il
=
mb
.
GetILGenerator
(
)
;
il
.
DeclareLocal
(
listtype
)
;
il
.
Emit
(
OpCodes
.
Newobj
,
ctor
)
;
il
.
Emit
(
OpCodes
.
Stloc_0
)
;
for
(
int
c
=
0
;
c
<
signature
.
Length
;
c
++
)
{
Type
t
=
signature
[
c
]
;
il
.
Emit
(
OpCodes
.
Ldloc_0
)
;
il
.
Emit
(
OpCodes
.
Ldarg_S
,
(
byte
)
(
c
+
1
)
)
;
if
(
t
.
IsValueType
)
{
il
.
Emit
(
OpCodes
.
Box
,
t
)
;
}
il
.
Emit
(
OpCodes
.
Callvirt
,
add
)
;
il
.
Emit
(
OpCodes
.
Pop
)
;
}
il
.
Emit
(
OpCodes
.
Ldarg_0
)
;
il
.
Emit
(
OpCodes
.
Ldloc_0
)
;
il
.
Emit
(
OpCodes
.
Call
,
dispatch
)
;
if
(
method
.
ReturnType
==
voidtype
)
{
il
.
Emit
(
OpCodes
.
Pop
)
;
}
else
if
(
method
.
ReturnType
.
IsValueType
)
{
il
.
Emit
(
OpCodes
.
Unbox_Any
,
method
.
ReturnType
)
;
}
il
.
Emit
(
OpCodes
.
Ret
)
;
Type
disp
=
tb
.
CreateType
(
)
;
cache
[
dtype
]
=
disp
;
return
disp
;
}
//====================================================================
// Given a delegate type and a callable Python object, GetDelegate
// returns an instance of the delegate type. The delegate instance
// returned will dispatch calls to the given Python object.
//====================================================================
internal
Delegate
GetDelegate
(
Type
dtype
,
IntPtr
callable
)
{
Type
dispatcher
=
GetDispatcher
(
dtype
)
;
object
[
]
args
=
{
callable
,
dtype
}
;
object
o
=
Activator
.
CreateInstance
(
dispatcher
,
args
)
;
return
Delegate
.
CreateDelegate
(
dtype
,
o
,
"Invoke"
)
;
}
}
/* When a delegate instance is created that has a Python implementation,
the delegate manager generates a custom subclass of Dispatcher and
instantiates it, passing the IntPtr of the Python callable.
The "real" delegate is created using CreateDelegate, passing the
instance of the generated type and the name of the (generated)
implementing method (Invoke).
The true delegate instance holds the only reference to the dispatcher
instance, which ensures that when the delegate dies, the finalizer
of the referenced instance will be able to decref the Python
callable.
A possible alternate strategy would be to create custom subclasses
of the required delegate type, storing the IntPtr in it directly.
This would be slightly cleaner, but I'm not sure if delegates are
too "special" for this to work. It would be more work, so for now
the 80/20 rule applies :)
*/
public
class
Dispatcher
{
public
IntPtr
target
;
public
Type
dtype
;
public
Dispatcher
(
IntPtr
target
,
Type
dtype
)
{
Runtime
.
Incref
(
target
)
;
this
.
target
=
target
;
this
.
dtype
=
dtype
;
}
~
Dispatcher
(
)
{
// Note: the managed GC thread can run and try to free one of
// these *after* the Python runtime has been finalized!
if
(
Runtime
.
Py_IsInitialized
(
)
>
0
)
{
IntPtr
gs
=
PythonEngine
.
AcquireLock
(
)
;
Runtime
.
Decref
(
target
)
;
PythonEngine
.
ReleaseLock
(
gs
)
;
}
}
public
object
Dispatch
(
ArrayList
args
)
{
IntPtr
gs
=
PythonEngine
.
AcquireLock
(
)
;
object
ob
=
null
;
try
{
ob
=
TrueDispatch
(
args
)
;
}
catch
(
Exception
e
)
{
PythonEngine
.
ReleaseLock
(
gs
)
;
throw
e
;
}
PythonEngine
.
ReleaseLock
(
gs
)
;
return
ob
;
}
public
object
TrueDispatch
(
ArrayList
args
)
{
MethodInfo
method
=
dtype
.
GetMethod
(
"Invoke"
)
;
ParameterInfo
[
]
pi
=
method
.
GetParameters
(
)
;
IntPtr
pyargs
=
Runtime
.
PyTuple_New
(
pi
.
Length
)
;
Type
rtype
=
method
.
ReturnType
;
for
(
int
i
=
0
;
i
<
pi
.
Length
;
i
++
)
{
// Here we own the reference to the Python value, and we
// give the ownership to the arg tuple.
IntPtr
arg
=
Converter
.
ToPython
(
args
[
i
]
,
pi
[
i
]
.
ParameterType
)
;
Runtime
.
PyTuple_SetItem
(
pyargs
,
i
,
arg
)
;
}
IntPtr
op
=
Runtime
.
PyObject_Call
(
target
,
pyargs
,
IntPtr
.
Zero
)
;
Runtime
.
Decref
(
pyargs
)
;
if
(
op
==
IntPtr
.
Zero
)
{
PythonException
e
=
new
PythonException
(
)
;
throw
e
;
}
if
(
rtype
==
typeof
(
void
)
)
{
return
null
;
}
Object
result
=
null
;
if
(
!
Converter
.
ToManaged
(
op
,
rtype
,
out
result
,
false
)
)
{
string
s
=
"could not convert Python result to "
+
rtype
.
ToString
(
)
;
Runtime
.
Decref
(
op
)
;
throw
new
ConversionException
(
s
)
;
}
Runtime
.
Decref
(
op
)
;
return
result
;
}
}
public
class
ConversionException
:
System
.
Exception
{
public
ConversionException
(
)
:
base
(
)
{
}
public
ConversionException
(
string
msg
)
:
base
(
msg
)
{
}
}
}
Back
|
FazBrowse Home
|
New Git URL