зеркало из https://github.com/microsoft/clang.git
151 строка
7.0 KiB
HTML
151 строка
7.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
|
"http://www.w3.org/TR/html4/strict.dtd">
|
|
<html>
|
|
<head>
|
|
<META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
|
|
<title>Clang - Get Involved</title>
|
|
<link type="text/css" rel="stylesheet" href="menu.css" />
|
|
<link type="text/css" rel="stylesheet" href="content.css" />
|
|
</head>
|
|
<body>
|
|
|
|
<!--#include virtual="menu.html.incl"-->
|
|
|
|
<div id="content">
|
|
|
|
<h1>Getting Involved with the Clang Project</h1>
|
|
|
|
<p>Once you have <a href="get_started.html">checked out and built</a> clang and
|
|
played around with it, you might be wondering what you can do to make it better
|
|
and contribute to its development. Alternatively, maybe you just want to follow
|
|
the development of the project to see it progress.
|
|
</p>
|
|
|
|
<h2>Follow what's going on</h2>
|
|
|
|
<p>Clang is a subproject of the <a href="http://llvm.org">LLVM Project</a>, but
|
|
has its own mailing lists because the communities have people with different
|
|
interests. The two clang lists are:</p>
|
|
|
|
<ul>
|
|
<li><a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits">cfe-commits
|
|
</a> - This list is for patch submission/discussion.</li>
|
|
|
|
<li><a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">cfe-dev</a> -
|
|
This list is for everything else clang related (questions and answers, bug
|
|
reports, etc).</li>
|
|
|
|
</ul>
|
|
|
|
<p>If you are interested in clang only, these two lists should be all
|
|
you need. If you are interested in the LLVM optimizer and code generator,
|
|
please consider signing up for <a
|
|
href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">llvmdev</a> and <a
|
|
href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">llvm-commits</a>
|
|
as well.</p>
|
|
|
|
|
|
<p>The best way to talk with other developers on the project is through the <a
|
|
href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">cfe-dev mailing
|
|
list</a>. The clang mailing list is a very friendly place and we welcome
|
|
newcomers. In addition to the cfe-dev list, a significant amount of design
|
|
discussion takes place on the <a
|
|
href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits">cfe-commits mailing
|
|
list</a>. All of these lists have archives, so you can browse through previous
|
|
discussions or follow the list development on the web if you prefer.</p>
|
|
|
|
|
|
<h2>Open Projects</h2>
|
|
|
|
<p>Here are a few tasks that are available for newcomers to work on, depending
|
|
on what your interests are. This list is provided to generate ideas, it is not
|
|
intended to be comprehensive. Please ask on cfe-dev for more specifics or to
|
|
verify that one of these isn't already completed. :)</p>
|
|
|
|
<ul>
|
|
<li><b>Compile your favorite C/ObjC project with "clang -fsyntax-only"</b>:
|
|
the clang type checker and verifier is quite close to complete (but not bug
|
|
free!) for C and Objective C. We appreciate all reports of code that is
|
|
rejected by the front-end, and if you notice invalid code that is not rejected
|
|
by clang, that is also very important to us. For make-based projects,
|
|
the <a href="get_started.html#ccc"><code>ccc</code></a> script in clang's
|
|
<tt>utils</tt> folder might help to get you started.</li>
|
|
|
|
<li><b>Compile your favorite C project with "clang -emit-llvm"</b>:
|
|
The clang to LLVM converter is getting more mature, so you may be able to
|
|
compile it. If not, please let us know. Again,
|
|
<a href="get_started.html#ccc"><code>ccc</code></a> might help you. Once it
|
|
compiles it should run. If not, that's a bug :)</li>
|
|
|
|
<li><b>Overflow detection</b>: an interesting project would be to add a -ftrapv
|
|
compilation mode that causes -emit-llvm to generate overflow tests for all
|
|
signed integer arithmetic operators, and call abort if they overflow. Overflow
|
|
is undefined in C and hard for people to reason about. LLVM IR also has
|
|
intrinsics for generating arithmetic with overflow checks directly.</li>
|
|
|
|
<li><b>Undefined behavior checking</b>: similar to adding -ftrapv, codegen could
|
|
insert runtime checks for all sorts of different undefined behaviors, from
|
|
reading uninitialized variables, buffer overflows, and many other things. This
|
|
checking would be expensive, but the optimizers could eliminate many of the
|
|
checks in some cases, and it would be very interesting to test code in this mode
|
|
for certain crowds of people. Because the inserted code is coming from clang,
|
|
the "abort" message could be very detailed about exactly what went wrong.</li>
|
|
|
|
<li><b>Continue work on C++ support</b>: Implementing all of C++ is a very big
|
|
job, but there are lots of little pieces that can be picked off and implemented.
|
|
See the <a href="cxx_status.html">C++ status report page</a> to find out what is
|
|
missing and what is already at least partially supported.</li>
|
|
|
|
<li><b>Improve target support</b>: The current target interfaces are heavily
|
|
stubbed out and need to be implemented fully. See the FIXME's in TargetInfo.
|
|
Additionally, the actual target implementations (instances of TargetInfoImpl)
|
|
also need to be completed.</li>
|
|
|
|
<li><b>Implement an tool to generate code documentation</b>: Clang's
|
|
library-based design allows it to be used by a variety of tools that reason
|
|
about source code. One great application of Clang would be to build an
|
|
auto-documentation system like doxygen that generates code documentation from
|
|
source code. The advantage of using Clang for such a tool is that the tool would
|
|
use the same preprocessor/parser/ASTs as the compiler itself, giving it a very
|
|
rich understanding of the code.</li>
|
|
|
|
<li><b>Use clang libraries to implement better versions of existing tools</b>:
|
|
Clang is built as a set of libraries, which means that it is possible to
|
|
implement capabilities similar to other source language tools, improving them
|
|
in various ways. Two examples are <a href="http://distcc.samba.org/">distcc</a>
|
|
and the <a href="http://delta.tigris.org/">delta testcase reduction tool</a>.
|
|
The former can be improved to scale better and be more efficient. The later
|
|
could also be faster and more efficient at reducing C-family programs if built
|
|
on the clang preprocessor.</li>
|
|
|
|
<li><b>Use clang libraries to extend Ragel with a JIT</b>: <a
|
|
href="http://research.cs.queensu.ca/~thurston/ragel/">Ragel</a> is a state
|
|
machine compiler that lets you embed C code into state machines and generate
|
|
C code. It would be relatively easy to turn this into a JIT compiler using
|
|
LLVM.</li>
|
|
|
|
<li><b>Self-testing using clang</b>: There are several neat ways to
|
|
improve the quality of clang by self-testing. Some examples:
|
|
<ul>
|
|
<li>Improve the reliability of AST printing and serialization by
|
|
ensuring that the AST produced by clang on an input doesn't change
|
|
when it is reparsed or unserialized.
|
|
|
|
<li>Improve parser reliability and error generation by automatically
|
|
or randomly changing the input checking that clang doesn't crash and
|
|
that it doesn't generate excessive errors for small input
|
|
changes. Manipulating the input at both the text and token levels is
|
|
likely to produce interesting test cases.
|
|
</ul>
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
<p>If you hit a bug with clang, it is very useful for us if you reduce the code
|
|
that demonstrates the problem down to something small. There are many ways to
|
|
do this; ask on cfe-dev for advice.</p>
|
|
|
|
</div>
|
|
</body>
|
|
</html>
|