From: "jistone at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug translator/18079] New: autocast doesn't work with @defined
Date: Tue, 03 Mar 2015 22:11:00 -0000 [thread overview]
Message-ID: <bug-18079-6586@http.sourceware.org/bugzilla/> (raw)
https://sourceware.org/bugzilla/show_bug.cgi?id=18079
Bug ID: 18079
Summary: autocast doesn't work with @defined
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
Assignee: systemtap at sourceware dot org
Reporter: jistone at redhat dot com
The "autocast" feature of type propagation doesn't work with @defined. For
example, "@defined(@task(0)->mm)" is 1 since mm does exist in this @cast
task_struct. But "@defined(task_current()->mm)" becomes 0, even though
task_current() also returns a @task() value.
This is because const-folding, including @defined, happens in
semantic_pass_optimize1 before the type propagation and autocast expansion in
semantic_pass_types. An un-expanded @defined is assumed to be bad. But
there's tricky interplay here, as some types might not be possible to resolve
until other @defined have been resolved to simplify things, so we can't just
reorder these.
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next reply other threads:[~2015-03-03 22:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-03 22:11 jistone at redhat dot com [this message]
2015-03-03 22:25 ` [Bug translator/18079] " jistone at redhat dot com
2016-05-27 14:25 ` dsmith at redhat dot com
2016-05-27 17:24 ` jistone at redhat dot com
2016-06-22 15:48 ` fche at redhat dot com
2016-06-24 17:43 ` jistone at redhat dot com
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