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Contributing to LLVM
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==================================
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Thank you for your interest in contributing to LLVM! There are multiple ways to
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contribute, and we appreciate all contributions. In case you
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have questions, you can either use the `Developer's List (llvm-dev)`_
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or the #llvm channel on `irc.oftc.net`_.
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If you want to contribute code, please familiarize yourself with the :doc:`DeveloperPolicy`.
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.. contents::
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:local:
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Ways to Contribute
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==================
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Bug Reports
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-----------
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If you are working with LLVM and run into a bug, we definitely want to know
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about it. Please let us know and follow the instructions in
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:doc:`HowToSubmitABug` to create a bug report.
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Bug Fixes
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---------
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If you are interested in contributing code to LLVM, bugs labeled with the
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`beginner keyword`_ in the `bug tracker`_ are a good way to get familiar with
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the code base. If you are interested in fixing a bug, please create an account
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for the bug tracker and assign it to yourself, to let people know you are working on
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it.
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Then try to reproduce and fix the bug with upstream LLVM. Start by building
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LLVM from source as described in :doc:`GettingStarted` and
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and use the built binaries to reproduce the failure described in the bug. Use
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a debug build (`-DCMAKE_BUILD_TYPE=Debug`) or a build with assertions
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(`-DLLVM_ENABLE_ASSERTIONS=On`, enabled for Debug builds).
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Bigger Pieces of Work
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---------------------
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In case you are interested in taking on a bigger piece of work, a list of
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interesting projects is maintained at the `LLVM's Open Projects page`_. In case
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you are interested in working on any of these projects, please send a mail to
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the `LLVM Developer's mailing list`_, so that we know the project is being
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worked on.
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How to Submit a Patch
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=====================
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Once you have a patch ready, it is time to submit it. The patch should:
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* include a small unit test
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* conform to the :doc:`CodingStandards`. You can use the `clang-format-diff.py`_ or `git-clang-format`_ tools to automatically format your patch properly.
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* not contain any unrelated changes
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* be an isolated change. Independent changes should be submitted as separate patches as this makes reviewing easier.
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.. _format patches:
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Before sending a patch for review, please also try to ensure it is
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formatted properly. We use ``clang-format`` for this, which has git integration
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through the ``git-clang-format`` script. On some systems, it may already be
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installed (or be installable via your package manager). If so, you can simply
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run it -- the following command will format only the code changed in the most
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recent commit:
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.. code-block:: console
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% git clang-format HEAD~1
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Note that this modifies the files, but doesn't commit them -- you'll likely want
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to run
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.. code-block:: console
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% git commit --amend -a
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in order to update the last commit with all pending changes.
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.. note::
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If you don't already have ``clang-format`` or ``git clang-format`` installed
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on your system, the ``clang-format`` binary will be built alongside clang, and
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the git integration can be run from
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``clang/tools/clang-format/git-clang-format``.
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To get a patch accepted, it has to be reviewed by the LLVM community. This can
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be done using `LLVM's Phabricator`_ or the llvm-commits mailing list.
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Please follow :ref:`Phabricator#requesting-a-review-via-the-web-interface <phabricator-request-review-web>`
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to request a review using Phabricator.
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To make sure the right people see your patch, please select suitable reviewers
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and add them to your patch when requesting a review. Suitable reviewers are the
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code owner (see CODE_OWNERS.txt) and other people doing work in the area your
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patch touches. If you are using Phabricator, add them to the `Reviewers` field
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when creating a review and if you are using `llvm-commits`, add them to the CC of
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your email.
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A reviewer may request changes or ask questions during the review. If you are
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uncertain on how to provide test cases, documentation, etc., feel free to ask
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for guidance during the review. Please address the feedback and re-post an
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updated version of your patch. This cycle continues until all requests and comments
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have been addressed and a reviewer accepts the patch with a `Looks good to me` or `LGTM`.
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Once that is done the change can be committed. If you do not have commit
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access, please let people know during the review and someone should commit it
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on your behalf.
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If you have received no comments on your patch for a week, you can request a
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review by 'ping'ing a patch by responding to the email thread containing the
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patch, or the Phabricator review with "Ping." The common courtesy 'ping' rate
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is once a week. Please remember that you are asking for valuable time from other
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professional developers.
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For more information on LLVM's code-review process, please see :doc:`CodeReview`.
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Helpful Information About LLVM
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==============================
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:doc:`LLVM's documentation <index>` provides a wealth of information about LLVM's internals as
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well as various user guides. The pages listed below should provide a good overview
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of LLVM's high-level design, as well as its internals:
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:doc:`GettingStarted`
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Discusses how to get up and running quickly with the LLVM infrastructure.
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Everything from unpacking and compilation of the distribution to execution
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of some tools.
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:doc:`LangRef`
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Defines the LLVM intermediate representation.
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:doc:`ProgrammersManual`
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Introduction to the general layout of the LLVM sourcebase, important classes
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and APIs, and some tips & tricks.
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`LLVM for Grad Students`__
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This is an introduction to the LLVM infrastructure by Adrian Sampson. While it
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has been written for grad students, it provides a good, compact overview of
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LLVM's architecture, LLVM's IR and how to write a new pass.
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.. __: http://www.cs.cornell.edu/~asampson/blog/llvm.html
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`Intro to LLVM`__
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Book chapter providing a compiler hacker's introduction to LLVM.
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.. __: http://www.aosabook.org/en/llvm.html
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.. _Developer's List (llvm-dev): http://lists.llvm.org/mailman/listinfo/llvm-dev
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.. _irc.oftc.net: irc://irc.oftc.net/llvm
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.. _beginner keyword: https://bugs.llvm.org/buglist.cgi?bug_status=NEW&bug_status=REOPENED&keywords=beginner%2C%20&keywords_type=allwords&list_id=130748&query_format=advanced&resolution=---
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.. _bug tracker: https://bugs.llvm.org
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.. _clang-format-diff.py: https://reviews.llvm.org/source/clang/browse/cfe/trunk/tools/clang-format/clang-format-diff.py
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.. _git-clang-format: https://reviews.llvm.org/source/clang/browse/cfe/trunk/tools/clang-format/git-clang-format
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.. _LLVM's Phabricator: https://reviews.llvm.org/
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.. _LLVM's Open Projects page: https://llvm.org/OpenProjects.html#what
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.. _LLVM Developer's mailing list: http://lists.llvm.org/mailman/listinfo/llvm-dev
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