[lldb-dev] Issue with Launch API

[Matthew Gardiner]

Hi Zephyr

I too have seen similar issue with this API.

I noticed that the file scripts/Python/python-swigsafecast.swig has no
entry for SBListener, and wondered if this was relevant.

Matt


On Mon, 2014-10-20 at 21:57 -0700, zephyr git wrote:
> Hi,
> 
> 
> I'm using the SBTarget.Launch() API in Python:
> 
> 
> process = target.Launch(self.dbg.GetListener(), ['a','b'], env, stdin,
> 'stdour.txt, 'stderr.txt', os.getcwd(), 0 , True, err)
> 
> 
> 
> I got the following error:
> 
> 
> ...
>   File
> "/home/media/llvm/lib/python2.7/site-packages/lldb/__init__.py", line
> 7973, in Launch
>     return _lldb.SBTarget_Launch(self, *args)
> NotImplementedError: Wrong number or type of arguments for overloaded
> function 'SBTarget_Launch'.
>   Possible C/C++ prototypes are:
>     lldb::SBTarget::Launch(lldb::SBListener &,char const **,char const
> **,char const *,char const *,char const *,char const
> *,uint32_t,bool,lldb::SBError &)
>     lldb::SBTarget::Launch(lldb::SBLaunchInfo &,lldb::SBError &)
> 
> 
> If I replace the string list ['a','b'] with None, it works.
> 
> 
> I find that all the tests and samples uses None.
> 
> 
> It looks the problem stems from overloaded Launch in SBTarget.i.
> 
> 
> In LLDBWrapPython.cpp:
> 
> 
> _wrap_SBTarget_Launch__SWIG_0 () { ...} // wrapper for
> Launch(lldb::SBListener &...)
> 
> _wrap_SBTarget_Launch__SWIG_1 () { ...} // wrapper for Launch
> (lldb::SBLaunchInfo &...);
> 
> 
> 
> SWIGINTERN PyObject *_wrap_SBTarget_Launch(PyObject *self, PyObject
> *args) {
> 
> ...
>   if (argc == 3) {
>  ....
>   }
>   if (argc == 11) {
>     int _v;
>     void *vptr = 0;
>     int res = SWIG_ConvertPtr(argv[0], &vptr,
> SWIGTYPE_p_lldb__SBTarget, 0);
>     _v = SWIG_CheckState(res);
>     if (_v) {
>       void *vptr = 0;
>       int res = SWIG_ConvertPtr(argv[1], &vptr,
> SWIGTYPE_p_lldb__SBListener, 0);
>       _v = SWIG_CheckState(res);
>       if (_v) {
>         void *vptr = 0;
>         int res = SWIG_ConvertPtr(argv[2], &vptr, SWIGTYPE_p_p_char,
> 0); // ===================== Fails here. unable to cast to char**
>         _v = SWIG_CheckState(res);
>         if (_v) {
>        ....
>                         if (_v) {
>                           return _wrap_SBTarget_Launch__SWIG_0(self,
> args);   ================> real check here
>                ...
>   }
>   
> fail:
>   SWIG_SetErrorMsg(PyExc_NotImplementedError,"Wrong number or type of
> arguments for overloaded function 'SBTarget_Launch'.\n"
>     "  Possible C/C++ prototypes are:\n"
>     "    lldb::SBTarget::Launch(lldb::SBListener &,char const **,char
> const **,char const *,char const *,char const *,char const
> *,uint32_t,bool,lldb::SBError &)\n"
>     "    lldb::SBTarget::Launch(lldb::SBLaunchInfo &,lldb::SBError
> &)\n");
>   return 0;
> 
> 
> 
> 
> It seems to me the swig code does some unnecessary check before it
> goes into the real wrapper.
> Any inputs?
> 
> 
> Thanks,
> Zephyr
> 
> 
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