mirror of
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41248b598b
Clarify expectations for handling new comments post-LGTM but pre-commit. This change aims to standardize expectations when new comments are added after a patch has received LGTM but before it has been committed. Currently, approaches to this vary, and this update seeks to clarify best practices.
183 lines
7.4 KiB
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183 lines
7.4 KiB
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==================================
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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 have questions,
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you can either use the `Forum`_ or, for a more interactive chat, go to our
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`Discord server`_.
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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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`good first issue`_ 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 comment on it to
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let people know you are working on 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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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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Reporting a Security Issue
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--------------------------
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There is a separate process to submit security-related bugs, see :ref:`report-security-issue`.
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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 post on the
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`Forum`_, so that we know the project is being worked on.
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.. _submit_patch:
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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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* have a single commit, up-to-date with the upstream ``origin/main`` branch, and don't have merges.
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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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The LLVM project has migrated to GitHub Pull Requests as its review process.
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For more information about the workflow of using GitHub Pull Requests see our
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:ref:`GitHub <github-reviews>` documentation. We still have an read-only
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`LLVM's Phabricator <https://reviews.llvm.org>`_ instance.
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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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maintainers (see ``Maintainers.rst``) and other people doing work in the area your
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patch touches. Github will normally suggest some reviewers based on rules or
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people that have worked on the code before. If you are a new contributor, you
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will not be able to select reviewers in such a way, in which case you can still
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get the attention of potential reviewers by CC'ing them in a comment -- just
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@name them.
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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 the GitHub PR 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
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other professional developers. Finally, if you do not have commit access,
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please let people know during the review and someone should commit it on your
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behalf once it has been accepted.
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For more information on LLVM's code-review process, please see
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:doc:`CodeReview`.
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.. _commit_from_git:
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For developers to commit changes from Git
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-----------------------------------------
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Once a patch is reviewed, you can select the "Squash and merge" button in the
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GitHub web interface. You might need to rebase your change before pushing
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it to the repo.
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LLVM currently has a linear-history policy, which means that merge commits are
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not allowed. The `llvm-project` repo on github is configured to reject pushes
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that include merges, so the `git rebase` step above is required.
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Please ask for help if you're having trouble with your particular git workflow.
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.. _git_pre_push_hook:
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Git pre-push hook
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^^^^^^^^^^^^^^^^^
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We include an optional pre-push hook that run some sanity checks on the revisions
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you are about to push and ask confirmation if you push multiple commits at once.
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You can set it up (on Unix systems) by running from the repository root:
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.. code-block:: console
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% ln -sf ../../llvm/utils/git/pre-push.py .git/hooks/pre-push
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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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.. _Forum: https://discourse.llvm.org
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.. _Discord server: https://discord.gg/xS7Z362
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.. _irc.oftc.net: irc://irc.oftc.net/llvm
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.. _good first issue: https://github.com/llvm/llvm-project/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22
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.. _bug tracker: https://github.com/llvm/llvm-project/issues
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.. _clang-format-diff.py: https://github.com/llvm/llvm-project/blob/main/clang/tools/clang-format/clang-format-diff.py
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.. _git-clang-format: https://github.com/llvm/llvm-project/blob/main/clang/tools/clang-format/git-clang-format
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.. _LLVM's GitHub: https://github.com/llvm/llvm-project
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.. _LLVM's Phabricator (read-only): https://reviews.llvm.org/
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.. _LLVM's Open Projects page: https://llvm.org/OpenProjects.html#what
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