[Bug translator/10076] New: $return optimization for functions returning void

[Bug translator/10076] New: $return optimization for functions returning void

[ananth at in dot ibm dot com]

When wildcard probing function returns, invariably one hits a problem:

[ananth@... ~]$ stap -ve 'probe kernel.function("*@fs/exec.c").return {
printf("%s\n", $return) }'
Pass 1: parsed user script and 51 library script(s) in 520usr/40sys/925real ms.
semantic error: function free_bprm(fs/exec.c) has no return value: identifier
'$return' at <input>:1:62
        source: probe kernel.function("*@fs/exec.c").return { printf("%s\n",
$return) }
                                                                             ^
Pass 2: analyzed script: 29 probe(s), 19 function(s), 0 embed(s), 0 global(s) in
370usr/760sys/1399real ms.
Pass 2: analysis failed.  Try again with another '--vp 01' option.

Would it be possible to emit a warning or a string "no $return in this context"
instead of aborting as above?

-- 
           Summary: $return optimization for functions returning void
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: ananth at in dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10076

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[Bug translator/10076] $return optimization for functions returning void

[fche at redhat dot com]

------- Additional Comments From fche at redhat dot com  2009-04-16 16:53 -------
See $$return.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING


http://sourceware.org/bugzilla/show_bug.cgi?id=10076

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[Bug translator/10076] $return optimization for functions returning void

[ananth at in dot ibm dot com]

------- Additional Comments From ananth at in dot ibm dot com  2009-04-16 17:01 -------
*** Bug 10077 has been marked as a duplicate of this bug. ***

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=10076

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[Bug translator/10076] $return optimization for functions returning void

[ananth at in dot ibm dot com]

------- Additional Comments From ananth at in dot ibm dot com  2009-04-16 17:02 -------
Thanks Frank. Works for me.

Guess it needs to be better (visibly) documented. Its currently just in the NEWS
file.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |FIXED


http://sourceware.org/bugzilla/show_bug.cgi?id=10076

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