Contributing to Verilator

Thanks for using Verilator! We welcome your contributions in whatever form.

This contributing document contains some suggestions that may make contributions flow more efficiently.

Did you find a Verilator bug?

Please ensure the bug was not already reported by searching Verilator Issues.
Please download the latest development GitHub version, build, and see if the issue has been fixed.
If you're unable to find an open issue addressing the problem, open a new Verilator issue.
- Be sure to include a code sample or an executable test case demonstrating the bug and expected behavior that is not occurring.
- The ideal example works against other simulators, and is in the test_regress/t test format, as described in Verilator Internals Documentation.

Please Open a new Verilator issue if there is not one already describing the bug.
Please Open a Verilator pull request.
See the coding conventions, and other developer information in docs/internals.rst in the distribution, or as rendered at Verilator Internals Documentation.
Verilator uses GitHub Actions to provide continuous integration. You may want to enable Actions on your GitHub branch to ensure your changes keep the tests passing.
Your source-code contributions must be certified as open source, under the Developer Certificate of Origin. On your first contribution, you must either:
- Have your patch include the addition of your name to docs/CONTRIBUTORS (preferred).
- Email, or post in an issue a statement that you certify your contributions.
- In any of these cases, your name will be added to docs/CONTRIBUTORS and you are agreeing all future contributions are also certified.
- We occasionally accept contributions where people do not want their name published. Please email us; you must still privately certify your contribution.
Your test contributions are generally considered released into the Creative Commons Public Domain (CC0), unless you request otherwise, or put a GNU/Artistic license on your file.
Most important is we get your patch.

Please see FAQ section and rest of the Verilator manual, or Verilator manual (PDF).
Ask any question in the Verilator forum.

Our contributors and participants pledge to make participation in our project and our community a positive experience for everyone. We follow the Contributor Covenant version 1.4.

Thanks!