[Bug runtime/17362] no script-level local variables available in F20's kernel.function("do_execve")

["jistone at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17362

Josh Stone <jistone at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |jistone at redhat dot com

--- Comment #2 from Josh Stone <jistone at redhat dot com> ---
If you use a script like:

  probe f = kernel.function("do_execve"){}
  probe f.call, f.inline { println($$parms) }

in pass-2 output you'll see:

  kernel.function("do_execve@fs/exec.c:1547").call /* pc=_stext+0x1edf38 */ /*
<- kernel.function("do_execve@fs/exec.c:1547").call */
  println(sprintf("filename=%#x __argv=%#x __envp=%#x",
_dwarf_tvar_get_filename_0(), _dwarf_tvar_get___argv_1(),
_dwarf_tvar_get___envp_2()))

  kernel.function("do_execve@fs/exec.c:1547").inline /* pc=_stext+0x1ee16f */
/* <- kernel.function("do_execve@fs/exec.c:1547").inline */
  println(sprintf("__envp=? __argv=? filename=?"))

So there's a full .call function which has all the parameters available, and an
.inline instance which has none of them.


(In reply to Frank Ch. Eigler from comment #1)
> Chances are this is related to
> https://bugzilla.redhat.com/show_bug.cgi?id=1126580

The producer string does indeed include -fno-var-tracking-assignments.

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