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using
System
;
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
{
private
Hashtable
cache
;
private
Type
basetype
;
private
Type
listtype
;
private
Type
voidtype
;
private
Type
typetype
;
private
Type
ptrtype
;
private
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
(
)
;
}
/// <summary>
/// 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.
/// </summary>
public
IntPtr
GetPythonHandle
(
Delegate
d
)
{
if
(
d
?
.
Target
is
Dispatcher
)
{
var
disp
=
(
Dispatcher
)
d
.
Target
;
return
disp
.
target
;
}
return
IntPtr
.
Zero
;
}
/// <summary>
/// GetDispatcher is responsible for creating a class that provides
/// an appropriate managed callback method for a given delegate type.
/// </summary>
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
;
var
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
(
)
;
var
signature
=
new
Type
[
pi
.
Length
]
;
for
(
var
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
(
var
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
;
}
/// <summary>
/// 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.
/// </summary>
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
;
private
readonly
PyReferenceDecrementer
_referenceDecrementer
;
public
Dispatcher
(
IntPtr
target
,
Type
dtype
)
{
_referenceDecrementer
=
PythonEngine
.
CurrentRefDecrementer
;
Runtime
.
XIncref
(
target
)
;
this
.
target
=
target
;
this
.
dtype
=
dtype
;
}
~
Dispatcher
(
)
{
_referenceDecrementer
?
.
ScheduleDecRef
(
target
)
;
}
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
(
var
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
.
XDecref
(
pyargs
)
;
if
(
op
==
IntPtr
.
Zero
)
{
var
e
=
new
PythonException
(
)
;
throw
e
;
}
if
(
rtype
==
typeof
(
void
)
)
{
return
null
;
}
object
result
=
null
;
if
(
!
Converter
.
ToManaged
(
op
,
rtype
,
out
result
,
false
)
)
{
Runtime
.
XDecref
(
op
)
;
throw
new
ConversionException
(
$
"could not convert Python result to
{
rtype
}
"
)
;
}
Runtime
.
XDecref
(
op
)
;
return
result
;
}
}
public
class
ConversionException
:
Exception
{
public
ConversionException
(
)
{
}
public
ConversionException
(
string
msg
)
:
base
(
msg
)
{
}
}
}
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