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<div class="moz-cite-prefix">On 6/25/12 8:55 PM, Thomson wrote:<br>
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cite="mid:CAPvC9U5WNjKuQ079WqTxX8HV5F6mK2QOZK_ExxALrUHbZj-+zQ@mail.gmail.com"
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<font face="verdana,sans-serif">Thanks, John.</font>
<div><font face="verdana,sans-serif"><br>
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<div><font face="verdana,sans-serif">This sounds reasonable that
the analysis group just provides an interface to its
implementors (pass). Then I have another question, is it
allowed to specify multiple pass in the same analysis group in
the command line for opt?</font></div>
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<br>
Yes, you can do that. Using multiple analysis passes that belong to
the same group may be useful when using chained analyses (like
points-to analysis) in which one analysis tries to get a result and,
if it can't get as good a result as it likes, asks the next analysis
in the chain (see
<a class="moz-txt-link-freetext" href="http://llvm.org/docs/WritingAnLLVMPass.html#AU::addRequired">http://llvm.org/docs/WritingAnLLVMPass.html#AU::addRequired</a>).<br>
<br>
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cite="mid:CAPvC9U5WNjKuQ079WqTxX8HV5F6mK2QOZK_ExxALrUHbZj-+zQ@mail.gmail.com"
type="cite">
<div><font face="verdana,sans-serif"> If yes, which pass will be
used for the call of getAnaysis<AnalysisGroup>()?</font></div>
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I believe the chain is in reverse order. So if you specify opt
-pass1 -pass2 -pass3 -transform, and transform queries the analysis
group to which pass1, pass2, and pass3 belong, then pass3 is queried
first. If pass3 then queries another pass in the analysis group,
the query will be sent to pass2. Likewise, if pass2 queries another
analysis in the group, it will be sent to pass1.<br>
<br>
-- John T.<br>
<br>
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cite="mid:CAPvC9U5WNjKuQ079WqTxX8HV5F6mK2QOZK_ExxALrUHbZj-+zQ@mail.gmail.com"
type="cite">
<div><font face="verdana,sans-serif"><br>
</font></div>
<div><font face="verdana,sans-serif">-Thomson<br>
</font><br>
<div class="gmail_quote">On Mon, Jun 25, 2012 at 10:34 PM, John
Criswell <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:criswell@illinois.edu" target="_blank">criswell@illinois.edu</a>></span>
wrote:<br>
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<div>On 6/24/12 10:37 AM, Thomson wrote:<br>
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<blockquote type="cite"> <font
face="verdana,sans-serif">I found that ProfileInfo
is contained in an analysis group, but ProfileInfo
class itself is not derived from any base classes of
passes, so it appears not to be a pass. Anything I
missed here?</font></blockquote>
<br>
</div>
This is just a guess, but I suspect that the ProfileInfo
class defines the interface which all passes in that
analysis group are expected to implement. I think I've
seen other analysis groups use this approach.<br>
<br>
-- John T.<br>
<br>
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<div> <font face="verdana,sans-serif"><br>
</font></div>
<div><font face="verdana,sans-serif">Thanks,</font></div>
<div><font face="verdana,sans-serif">-Thomson</font></div>
<br>
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