[llvm-commits] CVS: llvm/docs/DeveloperPolicy.html

Reid Spencer reid at x10sys.com
Tue Feb 13 01:06:18 PST 2007

Changes in directory llvm/docs:

DeveloperPolicy.html added (r1.1)
Log message:

First draft of the LLVM Developer Policy. This document is a "first cut"
at stating in clear terms the LLVM project's policies with respect to
developers and their contributions. Feedback on this is welcome while it
is in draft stage.

Diffs of the changes:  (+436 -0)

 DeveloperPolicy.html |  436 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 436 insertions(+)

Index: llvm/docs/DeveloperPolicy.html
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+                       "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.</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 developer's 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
+     respository 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 at llvm.org">oversight at 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, developer's 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 at 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 occuring 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 developers submit incremental patches. The
+   following defines the incremental development approach:</p>
+   <ol>
+     <li>The first task is to define the increment and get consensus (with the
+     LLVM development community) on what the end goal of the change is. Making 
+     random small changes that go nowhere is not useful for anyone.</li>
+     <li>An increment is the smallest patch size necessary to effect one change 
+     in LLVM.</li>
+     <li>Increments can be stand alone (e.g. to fix a bug), or part of a planned
+     series of increments towards some development goal.</li>
+     <li>Increments should be kept as small as possible. This simplifies your 
+     work (into a logical progression), simplifies code review and reduces the
+     chance that you will get negative feedback on the change. Small increments
+     also facilitate the maintenance of a high quality code base.</li>
+   </ol>
+ </div>
+ <!-- _______________________________________________________________________ -->
+ <div class="doc_subsection"> <a name="quality">Quality</a></div>
+ <div class="doc_text">
+   <p>The minimum quality standards for any change to the main development 
+   branch are:</p>
+   <ol>
+     <li>Code must adhere to the 
+     <a href="CodingStandards.html">LLVM Coding Standards</a>.</li>
+     <li>Code must compile cleanly (no errors, no warnings) on at least one 
+     platform.</li>
+     <li>Code must pass the deja gnu (llvm/test) test suite.</li>
+     <li>
+   </ol>
+   <p>Additionally, the committer is responsible for all of the following items.
+   It is considered significantly preferable for all of these items to be 
+   accounted for <i>before</i> the code is submitted for review or committed.</p>
+   <ol>
+     <li>Code must compile cleanly on all platforms.</li>
+     <li>Code must pass the <tt>llvm-test</tt> test suite including 
+     SPEC CINT2000, SPEC CFP2000, SPEC CINT2006, and SPEC CFP2006.</li>
+     <li>The changesat must not cause performance or correctness regressions 
+     for the LLVM tools.</li>
+     <li>The changes must not cause performance or correctness regressions in 
+     code compiled with LLVM on all applicable targets.</li>
+   </ol>
+ </div>
+ <!-- _______________________________________________________________________ -->
+ <div class="doc_subsection"> <a name="testcases">Test Cases</a></div>
+ <div class="doc_text">
+   <p>Developers are required to create test cases for regressions and new
+   features and include them with their changes. The following policies
+   apply:</p>
+   <ol>
+     <li>All feature and regression test cases must be added to the 
+     <tt>llvm/test</tt> directory. The appropriate subdirectory should be 
+     selected (see the <a href="TestingGuide.html">Testing Guide</a> for 
+     details.</li>
+     <li>Test cases should be written in LLVM assembly language unless the
+     feature or regression being tested requires another language.</li>
+     <li>Test cases, especially for regressions, should be as reduced as 
+     possible, preferably by 
+     <a href=CommandGuide/html/bugpoint.html>bugpoint</a>.  It is unacceptable 
+     to place an entire failing program into <tt>llvm/test</tt> as this creates
+     a <i>time-to-test</i> burden on all developers. Keep them short!</li>
+     <li>More extensive test cases (applications, benchmarks, etc.) should be 
+     added to the <tt>llvm-test</tt> test suite, after approval from the
+     Oversight Group. This test suite is for coverage not features or 
+     regressions.</li>
+   </ol>
+ </div>
+ <!--=========================================================================-->
+ <div class="doc_section"><a name="patches">Patch Policies</a></div>
+ <!--=========================================================================-->
+ <div class="doc_text">
+   <p>This section contains policies that pertain to submitting patches 
+   to LLVM and committing code to the repository</p>
+ </div>
+ <!-- _______________________________________________________________________ -->
+ <div class="doc_subsection"> <a name="p_form">Patch Form</a></div>
+ <div class="doc_text">
+   <p>When submitting a patch, developers must follow these rules:</p>
+   <ol>
+     <li>Patches must be made against the CVS HEAD (main development trunk), 
+     not a branch.</li>
+     <li>Patches must be made with this cvs command:<pre>
+     cvs diff -Ntdup -5</pre> or with the utility <tt>utils/mkpatch</tt>.</li>
+     <li>Patches must not include differences in generated code such as the
+     code generated by <tt>flex</tt>, <tt>bison</tt> or <tt>tblgen</tt>. The
+     <tt>utils/mkpatch</tt> utility takes care of this for you.</li>
+   </ol>
+ </div>
+ <!-- _______________________________________________________________________ -->
+ <div class="doc_subsection"> <a name="p_testing">Patch Testing</a></div>
+ <div class="doc_text">
+   <p>Before a patch is submitted for review, it should be tested to ensure 
+   that:</p>
+   <ol>
+     <li>The patch must compile against the CVS HEAD cleanly (zero warnings, zero
+     errors).</li>
+     <li>All the llvm/test (Deja Gnu) tests must pass.</li>
+     <li>All the llvm-test tests must pass on at least one platform.</li>
+   </ol>
+ </div>
+ <!-- _______________________________________________________________________ -->
+ <div class="doc_subsection"> <a name="p_submission">Patch Submission</a></div>
+ <div class="doc_text">
+   <p>When a patch is ready to be submitted, these policies apply:</p>
+   <ol>
+     <li>Patches should be submitted immediately after they are generated. Stale
+     patches are unlikely to apply correctly and could be rejected simply due to
+     age.</li>
+     <li>Patches must be submitted by e-mail to the 
+     <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">
+       llvm-commits</a> list.</li>
+   </ol>
+ </div>
+ <!-- _______________________________________________________________________ -->
+ <div class="doc_subsection"> <a name="p_after">After Submission</a></div>
+ <div class="doc_text">
+   <p>After a patch has been submitted, these policies apply:</p>
+   <ol>
+     <li>The patch is subject to review by anyone on the llvm-commits email list.
+     </li>
+     <li>Any changes recommended by the reviewer must be made by the submitter
+     of the patch and the patch re-submitted.</li>
+     <li>If the submitter believes the review comment is in error, a response to
+     the  <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">
+       llvm-commits</a> list should be made explaining why the recommendation 
+     cannot be followed.</li>
+   </ol>
+ </div>
+ <!-- _______________________________________________________________________ -->
+ <div class="doc_subsection"> <a name="p_after">After Commit</a></div>
+ <div class="doc_text">
+   <p>After a patch has been committed, these policies apply:</p>
+   <ol>
+     <li>The patch is subject to further review by anyone on the llvm-commits 
+     email list.</li>
+     <li>The patch submitter is responsible for all aspects of the patch per 
+     the <a href="quality">quality policy</a> above.</li>
+     <li>If the patch is discovered to not meet the 
+     <a href="quality">quality standards</a> standards within a reasonable time 
+     frame (24 hours), it may be subject to reversal.</li>
+   </ol>
+ </div>
+ <!-- _______________________________________________________________________ -->
+ <div class="doc_subsection"> <a name="c_access">Gaining Commit Access</a></div>
+ <div class="doc_text">
+   <p>Commit access to the repository is granted according to this policy:</p>
+   <ol>
+     <li>Commit access is not granted to anyone unless they specifically ask for
+     it.</li>
+     <li>Requests for commit access must be sent to the LLVM Oversight Group at
+     <a href="mailto:oversight at llvm.org">oversight at llvm.org</a>.</li>
+     <li>Granting commit access is at the sole discretion of the LLVM Oversight
+     Group.</li>
+     <li>Submitting patches to LLVM via the patch policy above will greatly
+     increase the chance that your request for commit access is granted.</li>
+     <li>Getting to know the members of the LLVM community (email, IRC, in person
+     contact, etc.) will also increase your chances.</li>
+   </ol>
+ </div>
+ <!-- _______________________________________________________________________ -->
+ <div class="doc_subsection"> <a name="c_new">New Committers</a></div>
+ <div class="doc_text">
+   <p>For those who have recently obtained commit access, the following policies
+   apply:</p>
+   <ol>
+     <li>You are granted <i>commit-after-approval</i> to all parts of LLVM.
+     To get approval, submit a patch to llvm-commits per the patch policies 
+     above.  When approved you may commit it yourself.</li>
+     <li>You are granted <i>commit-without-approavl</i> to those portions of LLVM
+     that you own (contributed) or maintain (have been assigned responsibility 
+     for), with the proviso that such commits must not break the build. This is
+     a "trust but verify" policy and commits of this nature are reviewed after 
+     they are committed.</li>
+     <li>Commits that violate the <a href="quality">quality standards</a> may
+     be reverted. This is necessary when the change blocks other developers from
+     making progress. The developers is welcome to re-commit the change after 
+     the problem has been fixed.</li>
+     <li>Multiple violations of these policies or a single aggregious violation
+     may cause commit access to be revoked, at the sole discretion of the
+     LLVM Oversight Group.</li>
+   </ol>
+ </div>
+ <!--=========================================================================-->
+ <div class="doc_section"><a name="notes">Policy Notes</a></div>
+ <!--=========================================================================-->
+ <div class="doc_text">
+   <p>This section contains some notes on policy topics that need to be
+   resolved and incorporated into the main body of the document above.</p>
+   <ol>
+     <li>When to open a new bug and when to re-use an existing one. For example
+     PR1158. If the same assertion happens do you open a new bug or reopen
+     1158?</li>
+   </ol>
+ </div>
+ <!-- *********************************************************************** -->
+ <hr>
+ <address>
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+   Written By: <a href="mailto:oversight at llvm.org">LLVM Oversight Group</a><br>
+   <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
+   Last modified: $Date: 2007/02/13 09:06:01 $
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