[pypy-dev] cannot use "id" in Rpython

[Shubha Ramani]

I don't know the signature of the function coming into execute_frame ahead of time. Therefore as you suggested Manuel,I am leaving the argument is an empty list []. This doesn't seem to work though. See the assertion error I'm getting below.All other examples of this technique I see being used are passing in specific argument types to define a succinctfunction signature, i.e. in test_warmstate.py: ENTER_JIT = lltype.Ptr(lltype.FuncType([lltype.Signed, lltype.Float,                                                                lltype.Signed], lltype.Bool))  

The following causes an assertion error:
 fun_name = _safe(pycode.co_name)                                                         fptr_type = lltype.Ptr(lltype.FuncType([], lltype.Void))                                 fptr = llhelper(fptr_type, fun_name)     
[translation] start debugger...> /opt/shubha_vtune_pypy/rpython/rtyper/lltypesystem/lltype.py(776)constPtr()-> assert T.is_constant()
 

    On Friday, December 30, 2016 8:59 AM, Shubha Ramani <shubharamani at yahoo.com> wrote:
 

 This is very helpful. Thank you Manuel !
I will try your suggestion.

Shubha

> On Dec 30, 2016, at 8:04 AM, Manuel Jacob <me at manueljacob.de> wrote:
> 
> The id of an object is not necessarily related in any way to the address of an object in Python.
> 
> In RPython, you can convert a function to a low-level function pointer with llhelper() from rpython.rtyper.annlowlevel.  You can call it like this:
> 
> fptr_type = lltype.Ptr(lltype.FuncType([], lltype.Void))
> fptr = llhelper(fptr_type, func)
> 
> Depending on what you want to do with the function address exactly, you might need to cast the function pointer to a RPython "Address" with cast_ptr_to_adr() from rpython.rtyper.lltypesystem.llmemory.
> 
>> On 2016-12-30 14:42, Shubha Ramani via pypy-dev wrote:
>> It's not a bad idea for me. I'm hooking up to a tool made by intel
>> called "vtune" which requires the function name, function size and
>> function address from the original python script code. I got the first
>> two from Python reflection (the way VmProf does it) but I need the
>> third (original script function  address). Is __repr__ supported in
>> Rpython ? The string returned by __repr__ contains the Python address
>> at least in Python. If id() doesn't work but __repr__ does then I can
>> use it in the overloaded execute_frame and that should be fine.
>> Shubha
>>> On Dec 29, 2016, at 4:29 PM, Ryan Gonzalez <rymg19 at gmail.com> wrote:
>>> What exactly are you trying to do. Using id to get the address of a function is usually a bad idea...
>>> --
>>> Ryan (ライアン)
>>> Yoko Shimomura > ryo (supercell/EGOIST) > Hiroyuki Sawano >> everyone else
>>> http://kirbyfan64.github.io/
>>>> On Dec 29, 2016 1:19 PM, "Shubha Ramani via pypy-dev" <pypy-dev at python.org> wrote:
>>>> What can I use then ? I need the address of the function ?
>>>> [translation:ERROR] Exception: cannot use id() in RPython; see objectmodel.compute_xxx()
>>>> Processing block:
>>>> block at 19 is a <class 'rpython.flowspace.flowcontext.SpamBlock'>
>>>> in (pypy.module._vtune.interp_vtune:28)_get_full_name
>>>> containing the following operations:
>>>>      buf_0 = simple_call((type RStringIO))
>>>>      v943 = getattr(buf_0, ('write'))
>>>>      v944 = getattr(pycode_0, ('co_code'))
>>>>      v945 = simple_call(v943, v944)
>>>>      v946 = getattr(buf_0, ('getsize'))
>>>>      size_code_0 = simple_call(v946)
>>>>      v947 = getattr(pycode_0, ('co_name'))
>>>>      id_func_0 = id(v947)
>>>>      v948 = getattr(pycode_0, ('co_name'))
>>>>      v949 = simple_call((function _safe), v948)
>>>>      v950 = getattr(pycode_0, ('co_firstlineno'))
>>>>      v951 = getattr(pycode_0, ('co_filename'))
>>>>      v952 = simple_call((function _safe), v951)
>>>>      v953 = newtuple(v949, v950, v952, size_code_0, id_func_0)
>>>>      v954 = mod(('vtune:%s:%d:%s:%d:%d'), v953)
>>>> --end--
>>>> [translation] start debugger...
>>>> > /opt/shubha_vtune_pypy/rpython/annotator/unaryop.py(188)id()
>>>> -> raise Exception("cannot use id() in RPython; "
>>>> (Pdb+)
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