[PATCH] Fix redundant implicit probe points in listing mode.

[Frank Ch. Eigler]

Wenji Huang <wenji.huang@oracle.com> writes:

> There are redundant probe points those will be outputted in listing
> mode. Such as:
> [wjhuang@systemtap]$ stap -l signal.d*
> signal.do_action
> begin(-1)
> end idx0:long

Right.

> @@ -1148,6 +1148,8 @@ semantic_pass_symbols (systemtap_session& s)
>  void add_global_var_display (systemtap_session& s)
>  {
>    varuse_collecting_visitor vut;
> +
> +  if (s.listing_mode)  return;

That's not too bad, though perhaps a session flag for
global_var_display per se could be used instead.  (It'd default to
"on"; not have any command line option to disable it directly yet; but
"-l"/'-L" would clear it.)


> @@ -173,7 +173,8 @@ printscript(systemtap_session& s, ostream& o)
>                second->locations[0]->print(tmps); // XXX: [0] is less
> arbitrary here, but still ...
>              }
>            string pp = tmps.str();
> -
> +          if (!pp.compare("begin(-1)")) continue;
> +

This one can't go in.  Instead, the tapset that includes that
begin(-1) probe could be changed to do the initialization in a
function (with a private initted-already? flag) rather than the begin
probe.  Future listings based on PR 3498 should make that workaround
unnecessary.

- FChE