<div dir="ltr">Ohh also, Raphael Isemann got back to me on the LLDB tab completion project, and said that another student has already written a proposal. He also suggested that I ask if another student has already submitted a proposal for this one, and if so, to look for another llvm project within the given time remaining.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 18, 2020 at 1:45 AM Benson Bin Bin Li <<a href="mailto:bbl2117@columbia.edu" target="_blank">bbl2117@columbia.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><span id="gmail-m_2064028793288335495gmail-m_3179536530125202393gmail-docs-internal-guid-d98814ff-7fff-92d5-1d96-bd4b1b0aaea7"><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">IMHO, you do. :)</span></blockquote><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap">Lol, you have too much faith in me. On a more serious note, how do I know what issue can be solved in a reasonable amount of time/how do I search for one?</span></p></span><br><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span style="font-size:13px">Please feel free to email me or Ettore if you encounter any blockers, or have further questions.</span></blockquote><div><br></div><div>Hi Whitney, thanks for the video link and info. I was a bit busy today, but I will work tomorrow and get back to you on this! </div><div><br></div><div>Best,</div><div>Benson</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Mar 17, 2020 at 12:54 PM Nicholas Krause <<a href="mailto:xerofoify@gmail.com" target="_blank">xerofoify@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<br>
<br>
<div>On 3/17/20 10:09 AM, Stefanos Baziotis
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi Nick,<br>
<br>
What you said makes sense, but it's not called a call graph. :)<br>
</div>
</blockquote>
Sure I assumed so that was just a term I used by mistake :).<br>
<blockquote type="cite">
<div dir="ltr">You're essentially referring to what LoopInfo does
which makes sense, but as I mentioned earlier, this is already
done<br>
in the LoopInfo. Now, how much one will be able to use it in a
LoopNestPass is another issue, which is certainly<br>
something that mentors could help you with.<br>
</div>
</blockquote>
I'm not applying for GSoC but that's a hint if other students are
applying to help them get started.<br>
<br>
Nick<br>
<blockquote type="cite">
<div dir="ltr"><br>
Best,<br>
Stefanos</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Στις Τρί, 17 Μαρ 2020 στις
3:35 μ.μ., ο/η Nicholas Krause <<a href="mailto:xerofoify@gmail.com" target="_blank">xerofoify@gmail.com</a>>
έγραψε:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> <br>
<br>
<div>On 3/17/20 9:23 AM, Stefanos Baziotis wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">> Yes that's correct.<br>
Well, now that I saw the LoopNestAnalysis* files, they
try to do sth similar. So, I hope it helped.<br>
<br>
> My idea was similar but using the call graph
directly<br>
<br>
Personally I don't see how the call graph can help you,
since well... it's a call graph. :)<br>
</div>
</blockquote>
Not directly but you can could implement a call graph for
the loops internal to a function and walk up <br>
it backwards. In addition you could make it possible to
implement this call graph to know the number<br>
of loops nested and pop out to the outermost as a function.
Basically SCC for loops themselves rather<br>
than functions.<br>
<br>
That's probably beyond the scope of the project so your
right it doesn't matter for this,<br>
Nick<br>
<blockquote type="cite">
<div dir="ltr">You care about loops in a specific
function. What can help you is the Control-Flow graph,
which is basically what LoopInfo uses to identify loops
in a function.<br>
But because of that, loop identification is not your
problem, loop traversing is, if I understand it
correctly.<br>
Although you have to do things similar to loop
identification (i.e. what LoopInfo does) when trying to<br>
decide for perfect nestings etc.<br>
<br>
Best,<br>
Stefanos<br>
<br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Στις Τρί, 17 Μαρ 2020
στις 3:08 μ.μ., ο/η Nicholas Krause <<a href="mailto:xerofoify@gmail.com" target="_blank">xerofoify@gmail.com</a>>
έγραψε:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> <br>
<br>
<div>On 3/16/20 11:41 PM, Stefanos Baziotis wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi everyone,<br>
<br>
> I probably do not have the time to get a
patch through.<br>
IMHO, you do. :)<br>
<br>
First of all, @Benson sorry but I'm not at all
familiar with LLDB so I can't help there.<br>
<br>
Other than that, I'll also disappoint you both
probably because I'm not that familiar with the
creation of passes and the problem at hand. I'll
try to help as I can.<br>
<br>
> <span style="color:rgb(0,0,0);font-family:Arial;font-size:14.6667px;white-space:pre-wrap">Is there a specific section of the dragon book that I should read so that I can at least understand theoretically what it means to create a LoopNestPass?
As I can understand, no because it's more of a structural, LLVM-specific problem than a generic, compiler optimization problem.
> </span>Stefanos can speak to this more but in order to create a
LoopNestPass after reading what they are talking
about requires information from the call graph<br>
> for a function or the loop hierarchy in
LLVM IR. I'm not sure of the internal classes
for this so Stefanos is there a way currently to
get the info in IR about<br>
> the outer loop or from the call graph? That
seems to be the biggest problem getting the
outer loop in the IR or the call graph. After
that you would<br>
> basically check if the loop is the outer
loop and if so you can add dynamically to the
pipeline.<br>
<br>
I'm not sure I followed you here. First of all,
if you create a regular LoopPass, you'll visit
loops from the innermost to the outermost. In
the loop nest pass<br>
you want the outermost though, so you'll have to
visit them all until you there. Now if you do it
in a function pass, you lose the ability to put
loops<br>
back into the pipeline, as this is how the
function pass works. So, the way I understand
it, to solve that problem, one would create
something like a function<br>
pass, figure out the loops there (i.e. with
LoopInfo), then convert it to LoopPass so that
you can run loop passes over the loops.<br>
I think this can happen already, but right now,
loops are going in reverse order: <a href="https://github.com/llvm/llvm-project/blob/master/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h#L230" target="_blank">https://github.com/llvm/llvm-project/blob/master/llvm/include/llvm/Transforms/Scalar/LoopPassManager.h#L230</a><br>
So, maybe if you could modify that to something
like FunctionToLestNestPassAdaptor, it would
work? I don't know that's just an idea, let me
not confuse you more.<br>
<br>
Best,<br>
Stefanos</div>
</blockquote>
Yes that's correct. My idea was similar but using
the call graph directly. The other problem is how to
keep LCSSA form for all the loops as well and I'm<br>
aware that function passes don't care about that.
So you can't really convert to a function pass
itself but something similar.<br>
<br>
Nick<br>
<blockquote type="cite">
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Στις Δευ, 16
Μαρ 2020 στις 5:53 π.μ., ο/η Nicholas Krause
<<a href="mailto:xerofoify@gmail.com" target="_blank">xerofoify@gmail.com</a>>
έγραψε:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> <br>
<br>
<div>On 3/15/20 11:12 PM, Benson Bin Bin Li
via llvm-dev wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi Stefanos,</div>
<div><br>
</div>
<div>First, thanks a lot for the very
detailed response! I watched both of
the videos, and I seem to have a rough
idea now of how each of the different
pieces of software maps onto the
compilation process. Though I found
blogs such as these two: <a href="https://jonasdevlieghere.com/understanding-the-clang-ast/" target="_blank">https://jonasdevlieghere.com/understanding-the-clang-ast/</a>,
<a href="https://releases.llvm.org/2.6/docs/tutorial/JITTutorial1.html" target="_blank">https://releases.llvm.org/2.6/docs/tutorial/JITTutorial1.html</a>
to be better for a more in-depth
understanding. Anyways, in response to
your answers:</div>
<div><br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>The latter can even be
problematic if you start applying
C++ craziness while the first is
pretty much always needed when
working in a team project.</div>
</blockquote>
<div>Ok, that makes sense as you would
want the style to be consistent
throughout. <br>
</div>
<div><br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>running the LLVM suite is super
easy</div>
</blockquote>
<div>Yeah, everything went fine from
following your instructions. I do have
a question though: How do I diagnose
failed tests? I found the files that
correspond to them, and they seem to
be 1 line scripts rather than "code"
per say. <br>
</div>
<div><br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> But I think every good GSoC
proposal includes a biography-like
section</div>
</blockquote>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>Then, try to study it, understand
the context and the problem. <br>
</div>
</blockquote>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>But because submitting good
patches is one of the best
indicators <br>
</div>
</blockquote>
<div>Ok, so for the application process,
basically try to get more info on the
projects I am interested in and from
there submit a proposal? Given the
whole coronavirus situation and the
time remaining for the application, I
probably do not have the time to get a
patch through. Regarding the projects
I am interested in, I have narrowed it
down to two(mostly because I don't
think I have the ability to tackle
PostDominatorTree project as of now),
and have the following questions about
them:</div>
<div><br>
</div>
<div>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt" id="gmail-m_2064028793288335495gmail-m_3179536530125202393gmail-m_-3739033030269313122gmail-m_-760413992732672551gmail-m_-1000483654617762840gmail-m_8480675998277982117gmail-docs-internal-guid-48482a0b-7fff-e7f0-4627-fb046bcc2e7f"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:underline;vertical-align:baseline;white-space:pre-wrap">LLVM Pass</span></p>
<ol style="margin-top:0px;margin-bottom:0px">
<li dir="ltr" style="list-style-type:decimal;font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap"><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">I am following the guide to create a LLVM pass following this guide(<a href="https://llvm.org/docs/WritingAnLLVMPass.html" target="_blank">https://llvm.org/docs/WritingAnLLVMPass.html</a>), but it appears “add_llvm_library” is a macro and not a built-in command. So I have two questions. 1) In comparing the online repo I found this macro in and my local, it appears I don’t have the file. Do I need to build it then? 2) How do I tell CMake to look for this macro?</span></p></li>
<li dir="ltr" style="list-style-type:decimal;font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap"><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">Is there a specific section of the dragon book that I should read so that I can at least understand theoretically what it means to create a LoopNestPass?</span></p></li>
</ol>
</div>
</div>
</blockquote>
Stefanos can speak to this more but in order
to create a LoopNestPass after reading what
they are talking about requires information
from the call graph<br>
for a function or the loop hierarchy in LLVM
IR. I'm not sure of the internal classes for
this so Stefanos is there a way currently to
get the info in IR about<br>
the outer loop or from the call graph? That
seems to be the biggest problem getting the
outer loop in the IR or the call graph.
After that you would<br>
basically check if the loop is the outer
loop and if so you can add dynamically to
the pipeline. <br>
<br>
Sorry if I'm not much help as I'm not sure
if the call graph API supports this but I'm
pretty sure LLVM IR doesn't make this easy,<br>
Nick<br>
<blockquote type="cite">
<div dir="ltr">
<div><br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:underline;vertical-align:baseline;white-space:pre-wrap">LLDB Tab Completion</span></p>
<ol style="margin-top:0px;margin-bottom:0px">
<li style="list-style-type:decimal;font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">Is there any resource I can read that explains how lldb is able to “pause” the executable and map it to a certain line in the source file/in general how lldb represents the state of the executable?</span></p></li>
<li style="list-style-type:decimal;font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">Where in the source code can I go to see how existing tab completions are implemented?</span></p></li>
<li style="list-style-type:decimal;font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">I built lldb and check-lldb, but it seems that the call path to clang got messed up, as it is trying to call "Example=Code/llvm-project" rather than my actual name for the directory "Example-Code/llvm-project". Should I just clone the repo into a parent directory that doesn't use hyphen?
</span></li>
</ol>
</div>
<div><br>
</div>
<div>(Would it be better if I posted
this on the forum?)</div>
<div><br>
</div>
<div>Best regards,</div>
<div>Benson<br>
</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On
Sat, Mar 14, 2020 at 11:10 AM Stefanos
Baziotis <<a href="mailto:stefanos.baziotis@gmail.com" target="_blank">stefanos.baziotis@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Hi Benson,<br>
<br>
You're welcome to the LLVM
community!<br>
<br>
I'll try to help but note that I'm
no formal position to talk about how
LLVM decides about GSoC (I'm a LLVM
newcomer anyway).<br>
With that said, the rest is _my_
opinion which is partially formed
from my experience as a GSoC
student.<br>
<br>
> <span style="color:rgb(0,0,0);font-family:Arial;font-size:14.6667px;white-space:pre-wrap">But to be up front about this, I have not done any full scale C++ project
</span><br>
Depending on how you define
"full-scale", a lot of amazing LLVM
contributors have not done a
full-scale C++. So, I think no
problem there, it's just good to
have a relatively good knowledge of
C++.<br>
Talking about C++ skills, I think
they're more important if you want
to contribute to Clang than say LLVM
middle or back-end. Because for
Clang, you have to know a lot of
details of the language<br>
in order to parse it, type-check it
and generate LLVM IR. In most other
parts of LLVM, you're only using the
language.<br>
As a matter of fact, if you have a
good knowledge of C++, I believe
it's more important to be able to
understand and adapt to "nearby"
code, than to be an expert in C++.<br>
The latter can even be problematic
if you start applying C++ craziness
while the first is pretty much
always needed when working in a team
project.<br>
<br>
> <span style="color:rgb(0,0,0);font-family:Arial;font-size:14.6667px;white-space:pre-wrap">1. Do I need to submit a resume/screening/patches?
</span><br>
As far as the resume, in the way
that you may usually apply to jobs,
no. But I think every good GSoC
proposal includes a biography-like
section<br>
where you basically tell your story
in programming and how you fit into
the project (in our case, LLVM).<br>
<br>
I'm not sure what you mean by
screening.<br>
<br>
As for patches, I don't think
they're required but they're super
useful. Not because they're some
part of unrelated logistics (like
"you have to have X patches to be
considered").<br>
But because submitting good patches
is one of the best indicators (if
not the best) that you are able to
do useful work in this project. :)<br>
And they don't only show your
technical skills. But also
communication skills, independence
etc.<br>
<br>
> 2. <span style="color:rgb(0,0,0);font-family:Arial;font-size:14.6667px;white-space:pre-wrap">Although I do have interests in certain projects posted on you website(Implement missing tab completion, createLoopPass, and PostDominatorTree), I am uncertain if I have enough expertise to decide what would be an appropriate project to contribute to given my current knowledge and experience.
</span><br>
This is kind of a generic sentence.<br>
I'd say, start with finding a
project that you're truly interested
in. Then, try to study it,
understand the context and the
problem.<br>
You don't need to get very far,
that's totally ok. You can then do a
post (either here or on Discourse: <a href="https://llvm.discourse.group/c/community/gsoc/32" target="_blank">https://llvm.discourse.group/c/community/gsoc/32</a>)<br>
for this specific project (you can
do posts for multiple projects).<br>
Hopefully, by discussing with people
(and mentors) and understanding what
the project is asking better,<br>
you can find if you want to do it or
not. Certainly, the mentors of the
project can guide you through.<br>
<br>
<span style="color:rgb(0,0,0);font-family:Arial;font-size:14.6667px;white-space:pre-wrap">3. The GCC GSoC website suggested checking out their source code, compiling and running their test suite. Can I do something similar for LLVM?
</span><br>
Yes, totally. I'm not familiar with
GCC internals but running the LLVM
suite is super easy (so easy that
you don't really learn anything by
doing it :P )<br>
So, the LLVM project has moved to a
common repository: <a href="https://github.com/llvm/llvm-project" target="_blank">https://github.com/llvm/llvm-project</a><br>
You can clone the project and then
use CMake to build it. The cmake
configuration for LLVM has a bunch
of flags: <a href="https://llvm.org/docs/CMake.html" target="_blank">https://llvm.org/docs/CMake.html</a><br>
and you may get lost. So, I'll say
start simple:<br>
Go to the llvm-project dir (the one
you cloned) and do:<br>
cmake ./llvm
-DLLVM_ENABLE_PROJECTS="clang"
-DCMAKE_BUILD_TYPE=Release
-DLLVM_ENABLE_ASSERTIONS=ON
-DLLVM_TARGETS_TO_BUILD="X86"<br>
<br>
In the link above you can read what
the flags do. llvm middle / back-end
(i.e. opt / llc, ask if you don't
know what these mean) is always
built. But to build clang<br>
we have to enable it explicitly. We
set build type to release because
doing a debug build will take a lot
of time and a lot of space. Also,
when starting out,<br>
you probably don't need it. We
enable assertions mostly because you
can use the -debug option say in opt
and see debug prints.<br>
Finally, we only build for x86 arch
because that's probably what you
have and you don't need any other
for now.<br>
<br>
Hit enter and once the configuration
is complete you can do:<br>
make<br>
or<br>
make -j<number of threads>
<-- this is faster but limit it
depending on your systemS<br>
<br>
When that's finished, the
llvm-project/bin/ dir will have
executables like clang, clang++,
opt, llc etc.<br>
Which you can run (also ask if you
don't know what to do with them.
With clang you probably will know,
it's like invoking<br>
most compilers like gcc to compile
.c / .cpp files).<br>
<br>
To run the test suite, you can go to
llvm-project/llvm/test and do:<br>
<dir of
llvm-project>/bin/llvm-lit .<br>
That will run only llvm's test suite
but you'll get an idea.<br>
<br>
Also, you can watch these videos:<br>
<a href="https://www.youtube.com/watch?v=J5xExRGaIIY" target="_blank">https://www.youtube.com/watch?v=J5xExRGaIIY</a><br>
<a href="https://www.youtube.com/watch?v=5kkMpJpIGYU" target="_blank">https://www.youtube.com/watch?v=5kkMpJpIGYU</a><br>
<br>
Hope this helped!<br>
<br>
Kind regards,<br>
Stefanos Baziotis</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Στις
Σάβ, 14 Μαρ 2020 στις 2:04 π.μ.,
ο/η Benson Bin Bin Li via llvm-dev
<<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>>
έγραψε:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt" id="gmail-m_2064028793288335495gmail-m_3179536530125202393gmail-m_-3739033030269313122gmail-m_-760413992732672551gmail-m_-1000483654617762840gmail-m_8480675998277982117gmail-m_-4313643294865233574gmail-m_-8466928840379538763gmail-docs-internal-guid-2a0d31dc-7fff-9297-e699-ad2df8792b10"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">Dear LLVM Team,</span></p>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">I would like to contribute to/participate in LLVM’s GSOC, because I would very much like to combine my knowledge of graph theory/algorithms and my interest in C++ together. Contributing to the LLVM code seems like a fantastic challenge and learning experience for these two interests of mine, as well as computer science in general (For example, the use of a new syntactic category to disambiguate a grammar demonstrates 1) indirection 2) the power of naming things).</span></p>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">But to be up front about this, I have not done any full scale C++ project(Although we had to modify the Linux kernel in my OS class, that was in C). However, I do believe my C++ skills are at an intermediate level, as C++, like Python, is a language in which I will spend my free time learning more about. Like vim, there is always more to learn in C++, and to that end I will watch CppCon Videos or peruse blogs such as Fluent C++(which is a treasure trove of material to nerd out on) in my free time. I also have a layman’s knowledge of CMake, from using it to configure ccls to lint C++ code with specific flags, and am aware of Google’s Test framework. Finally, I am currently taking Professor Stroustrap’s C++ class, and the compilers course here at Columbia.</span></p>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">Regarding the logistics:</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">1. Do I need to submit a resume/screening/patches? </span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">2. Although I do have interests in certain projects posted on you website(Implement missing tab completion, createLoopPass, and PostDominatorTree), I am uncertain if I have enough expertise to decide what would be an appropriate project to contribute to given my current knowledge and experience. </span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">3. The GCC GSoC website suggested checking out their source code, compiling and running their test suite. Can I do something similar for LLVM?</span></p>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">Anyways, thank you for taking the time to read this email, and I hope to hear back!</span></p>
<br>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">Best regards,</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap">Benson Li</span></p>
</div>
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