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pythonnet/src/runtime/nativecall.cs at python3.9 · gokmonk/pythonnet · GitHub
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runtime
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nativecall.cs
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using
System
;
using
System
.
Reflection
;
using
System
.
Reflection
.
Emit
;
using
System
.
Runtime
.
InteropServices
;
using
System
.
Threading
;
namespace
Python
.
Runtime
{
/// <summary>
/// Provides support for calling native code indirectly through
/// function pointers. Most of the important parts of the Python
/// C API can just be wrapped with p/invoke, but there are some
/// situations (specifically, calling functions through Python
/// type structures) where we need to call functions indirectly.
/// This class uses Reflection.Emit to generate IJW thunks that
/// support indirect calls to native code using various common
/// call signatures. This is mainly a workaround for the fact
/// that you can't spell an indirect call in C# (but can in IL).
/// Another approach that would work is for this to be turned
/// into a separate utility program that could be run during the
/// build process to generate the thunks as a separate assembly
/// that could then be referenced by the main Python runtime.
/// </summary>
internal
class
NativeCall
{
[
UnmanagedFunctionPointer
(
CallingConvention
.
Cdecl
)
]
private
delegate
void
Void_1_Delegate
(
IntPtr
a1
)
;
[
UnmanagedFunctionPointer
(
CallingConvention
.
Cdecl
)
]
private
delegate
int
Int_3_Delegate
(
IntPtr
a1
,
IntPtr
a2
,
IntPtr
a3
)
;
public
static
void
Void_Call_1
(
IntPtr
fp
,
IntPtr
a1
)
{
var
d
=
GetDelegate
<
Interop
.
DestructorFunc
>
(
fp
)
;
d
(
a1
)
;
}
public
static
IntPtr
Call_3
(
IntPtr
fp
,
IntPtr
a1
,
IntPtr
a2
,
IntPtr
a3
)
{
var
d
=
GetDelegate
<
Interop
.
TernaryFunc
>
(
fp
)
;
return
d
(
a1
,
a2
,
a3
)
;
}
public
static
int
Int_Call_3
(
IntPtr
fp
,
IntPtr
a1
,
IntPtr
a2
,
IntPtr
a3
)
{
var
d
=
GetDelegate
<
Interop
.
ObjObjArgFunc
>
(
fp
)
;
return
d
(
a1
,
a2
,
a3
)
;
}
private
static
T
GetDelegate
<
T
>
(
IntPtr
fp
)
where
T
:
Delegate
{
// Use Marshal.GetDelegateForFunctionPointer<> directly after upgrade the framework
return
(
T
)
Marshal
.
GetDelegateForFunctionPointer
(
fp
,
typeof
(
T
)
)
;
}
}
}
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