<div dir="ltr"><div><div>Wow, that is cool!<br></div>I'll check about it.<br><br></div>Thank you!<br></div><div class="gmail_extra"><br><div class="gmail_quote">On 4 March 2015 at 21:57, John Criswell <span dir="ltr"><<a href="mailto:jtcriswel@gmail.com" target="_blank">jtcriswel@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"><span class="">
<div>On 3/4/15 2:18 AM, Mingxing Zhang
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hello John,<br>
<br>
Thank you for your advices and congratulations~<br>
<br>
I'll read the code of cfl-aa and Giri first and make the
decision of which project to pursue.<br>
The choice will be reported to this thread once I made the
determination (hopefully within this week).<br>
</div>
</blockquote>
<br></span>
You should check for yourself, but I don't think anything prevents
you from submitting two proposals. If you have time to write two
strong proposals, I see no problem with that.<br>
<br>
Just make sure that any proposal you write is strong: it provides a
concrete explanation of what you want to do, some justification for
why it would benefit the community (short or long term), and why
you're the person qualified to do it. Proposals should also include
a set of milestones and expected dates for completing those
milestones.<br>
<br>
Regards,<br>
<br>
John Criswell<div><div class="h5"><br>
<br>
<blockquote type="cite">
<div dir="ltr"><br>
Thanks!<br>
<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 3 March 2015 at 23:12, John Criswell
<span dir="ltr"><<a href="mailto:jtcriswel@gmail.com" target="_blank">jtcriswel@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote">
<div>
<div>Dear Mingxing,<br>
<br>
I think both projects are interesting and useful.<br>
<br>
Points-to analysis is something that is needed by
research users of LLVM, but to the best of my knowledge,
no solid implementation currently exists (although the
cfl-aa work being done at Google may provide us with
something; you should check into it before writing a
proposal). My interest is in a points-to analysis that
is robust and is useful to both research and industry
users of LLVM. A points-to analysis proposal must
indicate how it will help both of these subsets of the
LLVM community, and it must argue why current efforts do
not meet the requirements of both subsets of the
community.<br>
<br>
The runtime bloat tool also looks interesting, and your
approach (at least to me) is interesting. One question
in my mind, though, is whether dynamic slicing is going
to work well. Swarup Sahoo and I built a dynamic slicer
for LLVM named Giri, and we found the tracing required
for dynamic slicing to be slow. For our purposes, the
overhead was okay as we only needed to record execution
until a crash (which happened quickly). In your bloat
tool, the program will probably run for awhile, creating
a long trace record. You should take a look at the Giri
code, use it to trace some programs, and see if the
overheads are going to be tolerable. If they are not,
then your first task would be to optimize Giri for your
bloat tool.<br>
<br>
You should also be more specific about which LLVM
instructions will be traced. For example, I wouldn't
record the outputs of every LLVM instruction; I might
only record the outputs of loads and stores or the end
of a def-use chain.<br>
<br>
I'd be interested in mentoring either project.<br>
<br>
BTW, it looks like your FSE paper won an award.
Congrats.<br>
<br>
Regards,<br>
<br>
John Criswell
<div>
<div><br>
<br>
<br>
<br>
<br>
<br>
<br>
On 3/3/15 2:30 AM, Mingxing Zhang wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div>
<div dir="ltr">Hi all,<br>
<br>
As a Ph.D. student majored in Software
Reliability, I have used LLVM in many of my
projects, such as the Anticipating Invariant (<a href="http://james0zan.github.io/AI.html" target="_blank">http://james0zan.github.io/AI.html</a>)
and some other undergoing ones.<br>
Thus, it would be a great pleasure for me if I
could take this opportunity to contribute to this
awesome project.<br>
<br>
After reading the idea list (<a href="http://llvm.org/OpenProjects.html" target="_blank">http://llvm.org/OpenProjects.html</a>),
I was most interested in the idea of improving the
"Pointer and Alias Analysis" passes.<br>
Could you please give me some more tips or advices
on how to get started on working on the
application?<br>
<br>
Simultaneously, I also have another idea about
using LLVM to detect runtime bloat, just like the
ThreadSanitizer tool for data races.<br>
If there is anyone here who would like to mentor
this project, could you please find some time to
review the <a href="https://gist.github.com/james0zan/d03737c60b10d0d11d34" target="_blank">more detailed proposal on gist</a>
and give me some feedbacks?<br>
<br>
P.S. <br>
I do prefer the bloat detection tool, but I'm
not sure about whether it is suitable for GSoC.<br>
Thus I will apply for the Alias Analysis one if
it is not suitable.<br>
<br>
Thanks!<br>
<br>
-- <br>
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>Mingxing Zhang
<div><br>
</div>
<div>Tel.: <a href="tel:%2B86-10-62797143" value="+861062797143" target="_blank">+86-10-62797143</a><br>
</div>
<div>Web: <a href="http://james0zan.github.io/" target="_blank">http://james0zan.github.io/</a><br>
</div>
<div>Addr: Room 3-122, FIT Building,
Tsinghua University, Beijing 100084,
China</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
<br>
</div>
</div>
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</pre>
</blockquote>
/<span><br>
<br>
<pre cols="72">--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
<a href="http://www.cs.rochester.edu/u/criswell" target="_blank">http://www.cs.rochester.edu/u/criswell</a></pre>
</span></div>
</blockquote>
</div>
<br>
<br>
<br>
-- <br>
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>Mingxing Zhang
<div><br>
</div>
<div>Tel.: <a href="tel:%2B86-10-62797143" value="+861062797143" target="_blank">+86-10-62797143</a><br>
</div>
<div>Web: <a href="http://james0zan.github.io/" target="_blank">http://james0zan.github.io/</a><br>
</div>
<div>Addr: Room 3-122, FIT Building, Tsinghua
University, Beijing 100084, China</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<br>
<br>
<pre cols="72">--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
<a href="http://www.cs.rochester.edu/u/criswell" target="_blank">http://www.cs.rochester.edu/u/criswell</a></pre>
</div></div></div>
</blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Mingxing Zhang<div><br></div><div>Tel.: +86-10-62797143<br></div><div>Web: <a href="http://james0zan.github.io/" target="_blank">http://james0zan.github.io/</a><br></div><div>Addr: Room 3-122, FIT Building, Tsinghua University, Beijing 100084, China</div></div></div></div></div></div>
</div>