[lttng-dev] get function names with lttng-ust-cyg-profile

[Liu, Changcheng]

On 10:19 Fri 26 Jun, Christophe Bédard wrote:
>    Hi,
>    On Tue, 23 Jun 2020 at 21:45, Liu, Changcheng
>    <[1]changcheng.liu at intel.com> wrote:
> 
>      Do you know how to print the call site function_name/offset?
>      For example:
>                  11     getchar();
>                  12
>                  13     x = add3(x);
>      Currently, it only shows call_site address instead of function name
>      with offset.
>      func_entry: { cpu_id = 2 }, { ip = 0x55CFA4F5C1EE, debug_info = {
>      bin = "instrument+0x11ee", func = "main+0", src = "instrument.c:7"
>      }, vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site =
>      0x7F27C4B1E0B3 }
>      func_entry: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = {
>      bin = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3"
>      }, vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site =
>      0x55CFA4F5C237 }
>      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1A9, debug_info = { bin
>      = "instrument+0x11a9", func = "add3+0", src = "instrument.c:3" },
>      vpid = 8523 }, { addr = 0x55CFA4F5C1A9, call_site = 0x55CFA4F5C237 }
>      func_exit: { cpu_id = 1 }, { ip = 0x55CFA4F5C1EE, debug_info = { bin
>      = "instrument+0x11ee", func = "main+0", src = "instrument.c:7" },
>      vpid = 8523 }, { addr = 0x55CFA4F5C1EE, call_site = 0x7F27C4B1E0B3 }
> 
>     Maybe I'm missing something, but isn't it right here? E.g.
      I'm also curious about the output here. "main+0" the function name
      "main" is right, but the offset "+0" isn't right.
      I've run it for several times, it always shows like the above
      output.
      So, two questions here:
      1. How to show the rigth offset?
      2. How to show call_site in "func/offset" format?
> 
>      debug_info = { bin = "instrument+0x11ee", func = "main+0", src =
>      "instrument.c:7" }
> 
>    Otherwise, I don't think babeltrace can provide any more information.
>    Christophe
> 
> References
> 
>    1. mailto:changcheng.liu at intel.com