[Bug translator/11005] New: compile-time error catching

[Bug translator/11005] New: compile-time error catching

[dsmith at redhat dot com]

Similar to bug #11004, it would be great if we had some syntax to tolerate
compile-time errors associated with $variable evaluation.

This would allow us to get rid of several kernel version checks and check for
$variable existence instead.  We could then turn something like this (from
syscall.poll):

====
%( kernel_vr > "2.6.15-1.1831" %?
	timeout = $timeout_msecs
%:
	timeout = $timeout
%)
====

into something like this:

====
	timeout = @catch($timeout_msecs, $timeout)
====

Where the syntax is something like '@catch($expr, $backup-expr)'.

-- 
           Summary: compile-time error catching
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: dsmith at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11005

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[Bug translator/11005] compile-time error catching w/ const-propagation

[fche at redhat dot com]

------- Additional Comments From fche at redhat dot com  2009-11-23 20:56 -------
Further discussion seems to favor this syntax:

@defined($expression)  --  integer-valued, evaluated at translation time

This requires const-propagated conditionals (if else  AND  ? :) as in

    println (@defined($foo) ? $foo : $bar)
    if (@defined($bar)) { println($bar) }


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|compile-time error catching |compile-time error catching
                   |                            |w/ const-propagation


http://sourceware.org/bugzilla/show_bug.cgi?id=11005

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[Bug translator/11005] compile-time error catching w/ const-propagation

[dsmith at redhat dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |10719


http://sourceware.org/bugzilla/show_bug.cgi?id=11005

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[Bug translator/11005] compile-time error catching w/ const-propagation

[fche at redhat dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
OtherBugsDependingO|                            |11179
              nThis|                            |


http://sourceware.org/bugzilla/show_bug.cgi?id=11005

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[Bug translator/11005] @defined() predicate for compile-time $var error catching

[fche at redhat dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|systemtap at sources dot    |fche at redhat dot com
                   |redhat dot com              |
             Status|NEW                         |ASSIGNED
            Summary|compile-time error catching |@defined() predicate for
                   |w/ const-propagation        |compile-time $var error
                   |                            |catching


http://sourceware.org/bugzilla/show_bug.cgi?id=11005

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