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|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>LLVM Developer Policy</title>
<link rel="stylesheet" href="llvm.css" type="text/css">
</head>
<body>
<div class="doc_warning">DRAFT Only. DRAFT Only. DRAFT Only. DRAFT Only.</div>
<div class="doc_title">LLVM Developer Policy</div>
<table class="layout"><tr class="layout"><td class="layout">
<h2>Contents</h2>
<ol>
<li><a href="#overview">Overview</a></li>
<li><a href="#terms">Terminology</a></li>
<li><a href="#candl">Copyright and License</a>
<ol>
<li><a href="#copyright">Copyright</a></li>
<li><a href="#license">License</a></li>
<li><a href="#devagree">Developer Agreements</a></li>
</ol></li>
<li><a href="#general">General Policies</a>
<ol>
<li><a href="#informed">Stay Informed</a> </li>
<li><a href="#newwork">Starting New Work</a></li>
<li><a href="#reviews">Code Reviews</a></li>
<li><a href="#incremental">Incremental Development</a></li>
<li><a href="#quality">Quality</a></li>
<li><a href="#testcases">Test Cases</a></li>
</ol></li>
<li><a href="#patches">Patch Policies</a>
<ol>
<li><a href="#p_form">Patch Form</a></li>
<li><a href="#p_testing">Patch Testing</a></li>
<li><a href="#p_submission">Patch Submission</a></li>
<li><a href="#p_after">After Submission</a></li>
<li><a href="#c_access">Obtaining Commit Access</a></li>
<li><a href="#c_new">New Committers</a></li>
</ol></li>
</ol>
<div class="doc_author">Written by LLVM Oversight Team</div>
</td><td class="layout">
<!--=========================================================================-->
<div class="doc_section"><a name="overview">Overview</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>This document contains the LLVM Developer Policy which defines the
project's policy towards developers and their contributions. The intent of
this policy is to eliminate mis-communication, rework, and confusion that
might arise from the distributed nature of LLVM's development. By stating
the policy in clear terms, we hope each developer can know ahead of time
what to expect when making LLVM contributions.</p>
</div>
<!--=========================================================================-->
<div class="doc_section"><a name="terms">Terminology</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>So that the policies defined in the next sections are clear, we first
define some terms here.</p>
<dl>
<dt><a name="t_change">Change</a></dt>
<dd>Any modification to LLVM including documentation, tests, build system,
etc. either in <a href="#t_patch">patch</a> or
<a href="#t_commit">commit</a> form.</dd>
<dt><a name="t_commit">Commit</a><dt>
<dd>A <a href="t_change">change</a> submitted directly to LLVM software
repository via the <tt>cvs commit</tt> command.</dd>
<dt><a name="t_developer">Developer</a></dt>
<dd>Anyone who submits a <a href="#t_change">change</a> to LLVM.</dd>
<dt><a name="t_inrement">Increment</a></dt>
<dd>A <a href="#t_change">change</a> or set of changes, whether by
<a href="#t_patch">patch</a> or <a href="#t_commit">commit</a>, that are
related by a single common purpose. Increments are atomic as they
leave LLVM in a stable state (both compiling and working properly).</dd>
<dt><a name="t_must">Must</a></dt>
<dd>When used in a policy statement, the term <i>must</i> implies a
non-optional requirement on the developer.</dd>
<dt><a name="t_patch">Patch</a></dt>
<dd>A <a href="#t_change">change</a> submitted by email in patch (diff)
format generated by the <tt>cvs diff</tt> command.</dd>
<dt><a name="t_should">Should</a></dt>
<dd>When used in a policy statement, the term <i>should</i> implies a
recommended but optional requirement on the developer.</dd>
</dl>
</div>
</td></tr></table>
<!--=========================================================================-->
<div class="doc_section"><a name="candl">Copyright and License</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>We address here the issues of copyright and license for the LLVM project.
A copyright is literally the "right to copy". It is a set of exclusive rights
granted to a party regulating the particular expression of information.
In this case, the information is LLVM. A license is something granted by a
copyright holder to other parties that controls the use of the information
by them. Currently, the University of Illinois is the LLVM copyright holder
and the terms of its license to LLVM users and developers is the
University of Illinois Open Source License (see LICENSE.txt).</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="copyright">Copyright</a></div>
<div class="doc_text">
<p>The LLVM project believes in correct attribution of contributions to
their contributors. Developers should, therefore, place their name at the
top of any source file they originate and list their contributions in the
CREDITS.TXT file. Furthermore, correct attribution of submitted patches
should be made in the commit comments.</p>
<p>However, for consistency and ease of management, the project requires the
copyright for all LLVM software to be held by a single copyright holder.
Although UIUC may assign the copyright of the software to another entity,
the intent for the project is to always have a single entity hold the copy
rights to LLVM at any given time.
<p>Having multiple copyright holders for various portions of LLVM is
problematic in the management of the software. Having a single copyright
holder is in the best interests of all developers and users as it greatly
reduces the managerial burden for any kind of administrative or technical
decisions about LLVM.</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="license">License</a></div>
<div class="doc_text">
<p>LLVM licensing decisions will be made by the LLVM Oversight Group. Any
issues, comments or suggestions with the licensing should be sent to
<a href="mailto:oversight@llvm.org">oversight@llvm.org</a>.</p>
<p>The LLVM Oversight Group intends to keep LLVM perpetually open source
and to use liberal open source licenses. The current license is the
University of Illinois Open Source License (see LICENSE.TXT), which boils
down to this:</p>
<ul>
<li>You can freely distribute LLVM.</li>
<li>You must retain the copyright notice if you redistribute.</li>
<li>Binaries derived from LLVM must reproduce the copyright notice.</li>
<li>You can't use our names to promote your LLVM derived products.</li>
<li>There's no warranty on LLVM at all.</li>
</ul>
<p>We believe this fosters the widest adoption of LLVM because it allows
commercial products to be derived from LLVM with few restrictions and
without a requirement for making any derived works also open source. The
intent of the license is to let people use LLVM freely with only the
obligation to be honest about where it came from.</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="devagree">Developer Agreements</a></div>
<div class="doc_text">
<p>With regards to the LLVM copyright and licensing, developers agree to:</p>
<ul>
<li>give up their copy rights to any contribution made so that the entire
software base can be managed by a single copyright holder.</li>
<li>allow their contribution(s) to be licensed as open source by the then
current or subsequent license chosen by the LLVM Oversight Group.</li>
<li>not make LLVM available under any other licensing agreement.</li>
</ul>
</div>
<!--=========================================================================-->
<div class="doc_section"><a name="general">General Policies</a></div>
<!--=========================================================================-->
<div class="doc_text">
<p>This section contains policies that pertain generally to LLVM developers.
<p>LLVM Developers are expected to meet the following obligations in order
for LLVM to maintain a high standard of quality<p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"> <a name="informed">Stay Informed</a> </div>
<div class="doc_text">
<p>Developers should stay informed by reading at least the
<a href="mailto:llvmdev@llvm.org">llvmdev</a> email list. If you are doing
anything more than just casual work on LLVM, it is highly suggested that you
also subscribe to the llvm-commits list and pay attention to changes being
made by others.</p>
<p>Active developers must register an email account with bugzilla
(<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a>) and preferably
subscribe to the llvm-bugs email list to keep track of bugs occurring in
LLVM.</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"> <a name="newwork">Starting New Work</a></div>
<div class="doc_text">
<p>When a developer begins new work with the aim of contributing it back to
LLVM, s/he must inform the community with an email to llvm-dev email list,
to the extent possible. The reason for this is to:
<ul>
<li>keep the community informed about future changes to LLVM, </li>
<li>avoid duplication of effort by having multiple parties working on the
same thing and not knowing about it, and</li>
<li>ensure that any issues around the proposed work are discussed and
resolved before any significant work is accomplished.</li>
</ul>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"> <a name="reviews">Code Reviews</a></div>
<div class="doc_text">
<p>LLVM has a code review policy. Code review is an excellent way to ensure
high quality in the software. The following policies apply:</p>
<ol>
<li>All developers are required to have any significant changes reviewed
before they are committed to the repository.</li>
<li>Code reviews are conducted by email.</li>
<li>Code can be reviewed either before it is committed or after.</li>
<li>The developer responsible for a code change is also responsible for
making all necessary review changes.</li>
<li>Developers should participate in code reviews as both a reviewer and
a reviewee. We don't have a dedicated team of reviewers. If someone is
kind enough to review your code, you should return the favor for someone
else.</li>
</ol>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"> <a name="incremental">Incremental Development</a>
</div>
<div class="doc_text">
<p>LLVM uses an incremental development style and all developers are expected
to follow this practice. Incremental development is a big key to LLVM's
success and it is essential that develo
|
