* [Bug translator/12151] New: support /* stable */ embedded-c pragma
@ 2010-10-22 0:51 fche at redhat dot com
0 siblings, 0 replies; only message in thread
From: fche at redhat dot com @ 2010-10-22 0:51 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=12151
Summary: support /* stable */ embedded-c pragma
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
AssignedTo: systemtap@sources.redhat.com
ReportedBy: fche@redhat.com
The intent of this markup would be to allow the optimizer to
call the given embedded-c function more than once per probe
handler. i.e:
probe foo {
println(pid())
bar[pid()]=5
println(zoo[pid(),execname()])
}
With current code, pid() would need to be called three times.
With the /* stable */ marker, it would be called once, and the
result memoized.
This would probably apply only to arity-0 functions, or perhaps
only to those with literal/stable parameters.
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2010-10-22 0:51 [Bug translator/12151] New: support /* stable */ embedded-c pragma fche at redhat dot com
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