Hi all,
I was doing a small test on filtering traces at runtime based on event
fields. There may be an elegant ways to define event arguments and
fields (ctf_sequence_text?) for my usecase for a tracepoint, but I was
just trying to do something like following, but for more than just 2
char* arguments:
TRACEPOINT_EVENT(retlif_tp, tpfilt,
TP_ARGS(
char*, str0,
char*, str1,
int, life
),
TP_FIELDS(
ctf_string(var0, str0)
ctf_string(var1, str1)
ctf_integer(int, lyf, life)
)
)
Here [1] is what I did. This is generated by a script I wrote so that
I can run my tests by varying the number of fields my filter needs to
run upon. I get this error [2] when the arguments are increased to
more than 10. It is related to macro expansion. Here is a snippet from
a healthy expanded macro:
/----
6722 extern struct lttng_ust_tracepoint __tracepoint_retlif_tp___tpfilt;
6723 static inline __attribute__ ((always_inline, unused))
6724 __attribute__ ((no_instrument_function))
6725 void __tracepoint_cb_retlif_tp___tpfilt (char *str0, char *str1,
6726 char *str2, char *str3,
6727 char *str4, int life);
6728 static void __tracepoint_cb_retlif_tp___tpfilt (char
*str0, char *str1,
6729 char *str2, char *str3,
6730 char *str4, int life)
----/
And here is a snippet from an unhealthy macro:
/----
6732 extern struct lttng_ust_tracepoint __tracepoint_retlif_tp___tpfilt;
6733 static inline __attribute__ ((always_inline, unused))
6734 __attribute__ ((no_instrument_function))
6735 void
6736 __tracepoint_cb_retlif_tp___tpfilt (_TP_EXPROTOint
6737 (char *, str0, char *, str1,
6738 char *, str2, char *, str3,
6739 char *, str4, char *, str5,
6740 char *, str6, char *, str7,
6741 char *, str8, char *, str9, int,
6742 life));
6743 static void
6744 __tracepoint_cb_retlif_tp___tpfilt (_TP_EXPROTOint
6745 (char *, str0, char *, str1,
6746 char *, str2, char *, str3,
6747 char *, str4, char *, str5,
6748 char *, str6, char *, str7,
6749 char *, str8, char *, str9, int,
6750 life))
----/
Note strings like "(_TP_EXPROTOint" being added at wrong location in
code. If someone can confirm its a bug, I can file a report and will
fix it. If its a known limitation, there needs to be error checks added.
[1] Tracepoint : http://ur1.ca/jr6gc
[2] Error : http://ur1.ca/jr6gm
Have a nice evening!
--
Suchakra
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