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If you want to hack on Miri yourself, great! Here are some resources you might find useful. Check out the issues on this GitHub repository for some ideas. For more ideas or help with hacking on Miri, you can contact us on the Rust Zulip. See the Rust website for a list of Miri maintainers. If you are thinking about making a larger-scale contribution -- in particular anything that needs more than can reasonably fit in a single PR to be feature-complete -- then please talk to us before writing significant amounts of code. Generally, we will ask that you follow a three-step 'project' process for such contributions:. Clearly define the goal of the project. This defines the scope of the project, i. If this involves functions that expose a big API surface with lots of flags, the project may want to support only a tiny subset of flags; that should be documented. A good way to express the goal is with one or more test cases that Miri should be able to successfully execute when the project is completed. It is a good idea to get feedback from team members already at this stage to ensure that the project is reasonably scoped and aligns with our interests. Make a design for how to realize the goal. A larger project will likely have to do global changes to Miri, like adding new global state to the Machine type or new methods to the FileDescription trait. Often we have to iterate on those changes, which can quite substantially change how the final implementation looks like. The design should be reasonably concrete, i. We realize that it can be hard to make a design without doing implementation work, in particular if you are not yet familiar with the codebase. Doing draft implementations in phase 2 of this process is perfectly fine, just please be aware that we might request fundamental changes that can require significantly reworking what you already did. If you open a PR in this stage, please clearly indicate that this project is still in the design stage. This process is largely informal, and its primary goal is to more clearly communicate expectations. Please get in touch with us if you have any questions! Most PRs bounce back and forth between the reviewer and the author several times, so it is good to keep track of who is expected to take the next step. We are using the S-waiting-for-review and S-waiting-for-author labels for that. If a reviewer asked you to do some changes and you think they are all taken care of, post a comment saying rustbot ready to mark a PR as ready for the next round of review. Miri heavily relies on internal and unstable rustc interfaces to execute MIR, which means it is important that you install a version of rustc that Miri actually works with. The rust-version file contains the commit hash of rustc that Miri is currently tested against. Other versions will likely not work. After installing rustup-toolchain-install-master , you can run the following command to install that exact version of rustc as a toolchain:. This will set up a rustup toolchain called miri and set it as an override for the current directory. You can also create a. If you don't want all of these to happen, you can add individual. Invoking Miri requires getting a bunch of flags right and setting up a custom sysroot. The miri script takes care of that for you. With the build environment prepared, compiling Miri is just one command away:. It accepts all the same flags as rustc though the ones only affecting code generation and linking obviously will have no effect and more. Tests in pass-dep need to be run using. For example:. Multiple filters are supported:. You can also do more targeted configuration, e. Note that you will only get info , warn or error messages if you use a prebuilt compiler. We use ui-testing in Miri, meaning we generate. You can use. For more info on how to configure ui tests see the documentation on the ui test crate. Working with the driver directly gives you full control, but you also lose all the convenience provided by cargo. Once your test case depends on a crate, it is probably easier to test it with the cargo wrapper. You can install your development version of Miri using. Note that the miri and cargo-miri executables are placed in the miri toolchain's sysroot to prevent conflicts with other toolchains. There's a test for the cargo wrapper in the test-cargo-miri directory; run. You can pass --target to execute the test for another target. Miri re-builds the standard library into a custom sysroot, so it is fairly easy to test Miri against a modified standard library -- you do not even have to build Miri yourself, the Miri shipped by rustup will work. Miri comes with a few benchmarks; you can run. Note: this will run. Also requires hyperfine to be installed cargo install hyperfine. To configure rust-analyzer and the IDE for working on Miri, copy one of the provided configuration files according to the instructions below. You can also set up a symbolic link to keep the configuration in sync with our recommendations. Since working on Miri requires a custom toolchain, and Helix requires the language server to be installed with the toolchain, you have to run. If you are building Miri with a locally built rustc, set rust-analyzer. For example, the path might look like.. In addition to that, replace clippy by check in the rust-analyzer. See the rustc-dev-guide's docs on 'Configuring rust-analyzer for rustc ' for more information about configuring the IDE and rust-analyzer. We described above the simplest way to get a working build environment for Miri, which is to use the version of rustc indicated by rustc-version. But sometimes, that is not enough. A big part of the Miri driver is shared with rustc, so working on Miri will sometimes require also working on rustc itself. In this case, you should not work in a clone of the Miri repository, but in a clone of the main Rust repository. A maintainer will eventually sync those changes back into this repository. We use the josh proxy to transmit changes between the rustc and Miri repositories. You can install it as follows:. Note: this usually happens automatically, so these steps rarely have to be done by hand. Now push this to a new branch in your Miri fork, and create a PR. It is worth running. We will use the josh proxy to push to your fork of rustc. Run the following in the Miri repo, assuming we are on an up-to-date master branch:. This will create a new branch called miri in your fork, and the output should include a link that creates a rustc PR to integrate those changes into the main repository. If that PR has conflicts, you need to pull rustc changes into Miri first, and then re-do the rustc push. If this fails due to authentication problems, it can help to make josh push via ssh instead of https. Add the following to your. Furthermore, the usual environment variables recognized by cargo miri also work for. The following environment variables are internal and must not be used by anyone but Miri itself. They are used to communicate between different Miri binaries, and as such worth documenting:. Skip to content. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. You switched accounts on another tab or window. Dismiss alert. Notifications You must be signed in to change notification settings Fork Star 4. Latest commit. History History. File metadata and controls Preview. Contribution Guide. Getting started. Larger-scale contributions. Managing the review state. Preparing the build environment. Building and testing Miri. Testing the Miri driver. Fine grained logging. Debugging error messages. UI testing. Testing cargo miri. Using a modified standard library. Configuring rust-analyzer. Visual Studio Code. Advanced configuration. Advanced topic: Working on Miri in the rustc tree. Advanced topic: Syncing with the rustc repo. Importing changes from the rustc repo. Fetch and merge rustc side of the history. Takes ca 5 min the first time. Exporting changes to the rustc repo. Further environment variables.