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

[Shubha Ramani]

Thank you Manuel. 

Sent from Shubha Ramani's iPhone 7

> On Jan 1, 2017, at 8:06 PM, Manuel Jacob <me at manueljacob.de> wrote:
> 
> Hi Shubha,
> 
> I forgot to mention that the code line starting with "fptr_type = " is valid Python code, but not valid RPython code.  More details on this in the documentation [1].  You should be able to fix the error by moving the line to the module toplevel.
> 
> -Manuel
> 
> [1] http://rpython.readthedocs.io/en/latest/getting-started.html
> 
>> On 2016-12-30 19:10, Shubha Ramani wrote:
>> 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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