Hello Victor Stinner.

Your tip helped me a lot.
I understood that I need to get position on bycode of the line.
So I create the funcion to get position inside of the bycode.
Now I can to jump the correct position on trace.

frame->f_lasti = checkBycodePosition(frame->f_code11);

int checkBycodePosition(PyCodeObject *coint fline)
    Py_ssize_t size = PyBytes_Size(co->co_lnotab) / 2;
    unsigned char *p = (unsigned char *)PyBytes_AsString(co->co_lnotab);
    int line = co->co_firstlineno;
    int addr = 0;
    while (--size >= 0)
        addr += *p++;

        line += (signed char)*p;

        if (line == fline)

    return addr;


Leandro Müller

De: Leandro Müller <leandrogmuller@hotmail.com>
Enviado: segunda-feira, 23 de março de 2020 13:45
Para: Victor Stinner <vstinner@python.org>
Cc: python-dev@python.org <python-dev@python.org>
Assunto: [Python-Dev] Re: Jump on C by PyEval_SetTrace Python 3.7.7
When I changed frame->f_lasti change de code to back, it's work but the line in front code occurs dump, the runtime over.
I jump to 8 line and after I jump to line 10, it occurs dump.

On python trace pdb the jump works good by the frame-f_lineno.


Leandro Müller

De: Victor Stinner <vstinner@python.org>
Enviado: segunda-feira, 23 de março de 2020 13:01
Para: Leandro Müller <leandrogmuller@hotmail.com>
Cc: python-dev@python.org <python-dev@python.org>
Assunto: Re: [Python-Dev] Jump on C by PyEval_SetTrace Python 3.7.7

It seems like you should be to modify frame->f_lasti in a trace function

FYI in a frame object, the line number is computed using
frame->f_lasti and f->f_code->co_lnotab: PyFrame_GetLineNumber().

See: https://github.com/python/cpython/blob/master/Objects/lnotab_notes.txt

Good luck ;-)


Le lun. 23 mars 2020 à 00:50, Leandro Müller
<leandrogmuller@hotmail.com> a écrit :
> Hi everyone.
> I'm trying to make a simple jump on C funcion trace by frame->f_lineno.
> Example is simple, but not working.
> if (frame->f_lineno == 12){
> frame->f_lineno = 8;
> }
> attached files C and python to run test.
> the line 12 I need to jump to line 8.
> Att.
> Leandro Müller
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