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pythonnet/src/runtime/managedtype.cs at develop · achernet/pythonnet · GitHub
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runtime
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managedtype.cs
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// ==========================================================================
// 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
.
Runtime
.
InteropServices
;
using
System
.
Collections
;
using
System
.
Reflection
;
namespace
Python
.
Runtime
{
//========================================================================
// Common base class for all objects that are implemented in managed
// code. It defines the common fields that associate CLR and Python
// objects and common utilities to convert between those identities.
//========================================================================
internal
abstract
class
ManagedType
{
internal
GCHandle
gcHandle
;
// Native handle
internal
IntPtr
pyHandle
;
// PyObject *
internal
IntPtr
tpHandle
;
// PyType *
//====================================================================
// Given a Python object, return the associated managed object or null.
//====================================================================
internal
static
ManagedType
GetManagedObject
(
IntPtr
ob
)
{
if
(
ob
!=
IntPtr
.
Zero
)
{
IntPtr
tp
=
Runtime
.
PyObject_TYPE
(
ob
)
;
if
(
tp
==
Runtime
.
PyTypeType
||
tp
==
Runtime
.
PyCLRMetaType
)
{
tp
=
ob
;
}
int
flags
=
(
int
)
Marshal
.
ReadIntPtr
(
tp
,
TypeOffset
.
tp_flags
)
;
if
(
(
flags
&
TypeFlags
.
Managed
)
!=
0
)
{
IntPtr
op
=
(
tp
==
ob
)
?
Marshal
.
ReadIntPtr
(
tp
,
TypeOffset
.
magic
(
)
)
:
Marshal
.
ReadIntPtr
(
ob
,
ObjectOffset
.
magic
(
)
)
;
GCHandle
gc
=
(
GCHandle
)
op
;
return
(
ManagedType
)
gc
.
Target
;
}
// In certain situations, we need to recognize a wrapped
// exception class and be willing to unwrap the class :(
if
(
Runtime
.
wrap_exceptions
)
{
IntPtr
e
=
Exceptions
.
UnwrapExceptionClass
(
ob
)
;
if
(
(
e
!=
IntPtr
.
Zero
)
&&
(
e
!=
ob
)
)
{
ManagedType
m
=
GetManagedObject
(
e
)
;
Runtime
.
Decref
(
e
)
;
return
m
;
}
}
}
return
null
;
}
internal
static
ManagedType
GetManagedObjectErr
(
IntPtr
ob
)
{
ManagedType
result
=
GetManagedObject
(
ob
)
;
if
(
result
==
null
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
"invalid argument, expected CLR type"
)
;
}
return
result
;
}
internal
static
bool
IsManagedType
(
IntPtr
ob
)
{
if
(
ob
!=
IntPtr
.
Zero
)
{
IntPtr
tp
=
Runtime
.
PyObject_TYPE
(
ob
)
;
if
(
tp
==
Runtime
.
PyTypeType
||
tp
==
Runtime
.
PyCLRMetaType
)
{
tp
=
ob
;
}
int
flags
=
(
int
)
Marshal
.
ReadIntPtr
(
tp
,
TypeOffset
.
tp_flags
)
;
if
(
(
flags
&
TypeFlags
.
Managed
)
!=
0
)
{
return
true
;
}
}
return
false
;
}
}
}
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