[Bug translator/2643] New: Translator fails pass 2 if probe alias does not have the matching .return alias

[Bug translator/2643] New: Translator fails pass 2 if probe alias does not have the matching .return alias

[hien at us dot ibm dot com]

Recently, we removed the syscall.exit.return and and syscall.exit_group.return
aliases in the syscalls.stp. That cause the translator fails pass 2 when do try
to compile this script


probe syscall.*, syscall.*.return {

/* do something */

}

Looks like the translator is looking for the match pair of function entry and
return.

-- 
           Summary: Translator fails pass 2 if probe alias does not have the
                    matching .return alias
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: hien at us dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=2643

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[Bug translator/2643] probe point wildcard expansion excessively optimistic

[fche at redhat dot com]

------- Additional Comments From fche at redhat dot com  2006-05-05 23:29 -------
The patch for bug #2433 awakened a latent bug in the translator that expands
probe point wildcards.  The same problem appears with this case:

probe a.a.a = begin { }
probe a.b = begin { }
probe a.*.a  { }

The wildcard should expand to "a.a.a" only, but since it proceeds naively one
component at a time and lacks lookahead, it also expands to "a.b.a".

One quick hack as a workaround until the real fix is to add back some dummy
probe aliases for the two recently deceased.

probe syscall.exit.return = end {}
probe syscall.exit_group.return = end {}


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |eteo at redhat dot com
            Summary|Translator fails pass 2 if  |probe point wildcard
                   |probe alias does not have   |expansion excessively
                   |the matching .return alias  |optimistic


http://sourceware.org/bugzilla/show_bug.cgi?id=2643

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[Bug translator/2643] probe point wildcard expansion excessively optimistic

[fche at redhat dot com]

------- Additional Comments From fche at redhat dot com  2006-05-05 23:35 -------
By the way, bug #2111 comment #4 hints at the reason why this regression wasn't
caught by the testsuite: buildok/syscall.stp has been a de facto "ko"
(expect-fail) test case, waiting for a new syscalls embedded-C buildok test case.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=2643

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[Bug translator/2643] probe point wildcard expansion excessively optimistic

[dsmith at redhat dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|systemtap at sources dot    |dsmith at redhat dot com
                   |redhat dot com              |
             Status|NEW                         |ASSIGNED


http://sourceware.org/bugzilla/show_bug.cgi?id=2643

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