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[Bug translator/5899] New: $ptr->member in return probe
- From: "jkenisto at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 8 Mar 2008 01:06:58 -0000
- Subject: [Bug translator/5899] New: $ptr->member in return probe
- Reply-to: sourceware-bugzilla at sourceware dot org
When I refer to $ptr->member in a return probe, and $ptr is a function arg, what
I get is the value of $ptr->member as it was when the function was called. If
the function changes the contents of the object $ptr points to, usually what I
want is the value of $ptr->member when the function returns.
Because of stap's non-support for casting stap variables to pointers, I have to
resort to imbedded C to dig out the value I want.
I'd like a way to specify what I want. For example:
entry_value($ptr->member) gets me what I get today.
entry_value($ptr)->member gets the current value of member using the value of
ptr when the function was called.
I think $ptr->member should yield either an error or (preferably) the same thing
as entry_value($ptr)->member. If I want entry_value($ptr->member), I can just
save that value during my entry probe.
--
Summary: $ptr->member in return probe
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: jkenisto at us dot ibm dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=5899
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