Hello,

i am trying (mostly successfully, thank you! :D) to wrap the 
SpiderMonkey library (http://www.mozilla.org/js/spidermonkey/) into 
Python using ctypes. The wrapper has been built using the ctypeslib 
CodeGenerator.

I have to set up a structure, basically a vtable, so i have to fill a 
structure members with function pointers. These function are provided by 
the library itself, i don't have to setup Python callbacks here.

The structure defined like:

     struct JSClass {
         const char          *name;
         uint32              flags;
         JSPropertyOp        addProperty;
         JSPropertyOp        delProperty;
         ... and so on...
     }

I have to do the C equivalent of:

     JSClass global_class = {
         "global",0,
         JS_PropertyStub,JS_PropertyStub,
         ... etc
     };

Up to now, the only way i managed to make it work is:

     global_class = JSClass('global', 0,
         JSPropertyOp(JS_PropertyStub),
         JSPropertyOp(JS_PropertyStub),
         ...

while the most obvious solution (directly passing JS_PropertyStub to the 
Python wrapped structure) leads to a TypeError (incompatible types, 
_FuncPtr instance instead of CFunctionType instance).

Even if the above solution works, i am concerned that, when C code will 
access this vtable, it will call a Python function which in turn will 
call the desired function, resulting in an extra Python roundtrip for 
each call where only C code should have been involved.

Is it true? If so, how can i pass a pointer to a C function without such 
double wrapping?

Thanks in advance,

Daniele

P.S. what is the best place to report a bug in the CodeGenerator?

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