112 lines
4.1 KiB
Markdown
112 lines
4.1 KiB
Markdown
# Miri [[slides](https://solson.me/miri-slides.pdf)] [[report](https://solson.me/miri-report.pdf)] [](https://travis-ci.org/solson/miri) [](https://ci.appveyor.com/project/solson63299/miri)
|
|
|
|
|
|
An experimental interpreter for [Rust][rust]'s [mid-level intermediate
|
|
representation][mir] (MIR). This project began as part of my work for the
|
|
undergraduate research course at the [University of Saskatchewan][usask].
|
|
|
|
## Building Miri
|
|
|
|
I recommend that you install [rustup][rustup] to obtain Rust. miri comes with a
|
|
`rust-toolchain` file so rustup will automatically pick a suitable nightly
|
|
version. Then all you have to do is:
|
|
|
|
```sh
|
|
cargo build
|
|
```
|
|
|
|
## Running tests
|
|
|
|
```sh
|
|
cargo run tests/run-pass/vecs.rs # Or whatever test you like.
|
|
```
|
|
|
|
## Running miri on your own project('s test suite)
|
|
|
|
Install miri as a cargo subcommand with `cargo install --debug`.
|
|
Then, inside your own project, use `cargo +nightly miri` to run your project, if it is
|
|
a bin project, or run `cargo +nightly miri test` to run all tests in your project
|
|
through miri.
|
|
|
|
## Running miri with full libstd
|
|
|
|
Per default libstd does not contain the MIR of non-polymorphic functions. When
|
|
miri hits a call to such a function, execution terminates. To fix this, it is
|
|
possible to compile libstd with full MIR:
|
|
|
|
```sh
|
|
rustup component add rust-src
|
|
cargo install xargo
|
|
cd xargo/
|
|
RUSTFLAGS='-Zalways-encode-mir' xargo build
|
|
```
|
|
|
|
Now you can run miri against the libstd compiled by xargo:
|
|
|
|
```sh
|
|
MIRI_SYSROOT=~/.xargo/HOST cargo run tests/run-pass-fullmir/hashmap.rs
|
|
```
|
|
|
|
Notice that you will have to re-run the last step of the preparations above when
|
|
your toolchain changes (e.g., when you update the nightly).
|
|
|
|
You can also set `-Zmiri-start-fn` to make miri start evaluation with the
|
|
`start_fn` lang item, instead of starting at the `main` function.
|
|
|
|
## Development and Debugging
|
|
|
|
Since the heart of miri (the main interpreter engine) lives in rustc, working on
|
|
miri will often require using a locally built rustc. This includes getting a
|
|
trace of the execution, as distributed rustc has `trace!` disabled.
|
|
|
|
The first-time setup for a local rustc looks as follows:
|
|
```
|
|
git clone https://github.com/rust-lang/rust/ rustc
|
|
cd rustc
|
|
cp config.toml.example config.toml
|
|
# Now edit `config.toml` and set `debug-assertions = true`
|
|
./x.py build src/rustc
|
|
# You may have to change the architecture in the next command
|
|
rustup toolchain link custom build/x86_64-unknown-linux-gnu/stage2
|
|
# Now cd to your miri directory
|
|
rustup override set custom
|
|
```
|
|
The `build` step can take 30 minutes and more.
|
|
|
|
Now you can `cargo build` miri, and you can `cargo test --tests`. (`--tests`
|
|
is needed to skip doctests because we have not built rustdoc for your custom
|
|
toolchain.) You can also set `RUST_LOG=rustc_mir::interpret=trace` as
|
|
environment variable to get a step-by-step trace.
|
|
|
|
If you changed something in rustc and want to re-build, run
|
|
```
|
|
./x.py build src/rustc --keep-stage 0
|
|
```
|
|
This avoids rebuilding the entire stage 0, which can save a lot of time.
|
|
|
|
## Contributing and getting help
|
|
|
|
Check out the issues on this GitHub repository for some ideas. There's lots that
|
|
needs to be done that I haven't documented in the issues yet, however. For more
|
|
ideas or help with running or hacking on Miri, you can contact me (`scott`) on
|
|
Mozilla IRC in any of the Rust IRC channels (`#rust`, `#rust-offtopic`, etc).
|
|
|
|
## License
|
|
|
|
Licensed under either of
|
|
* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
|
|
http://www.apache.org/licenses/LICENSE-2.0)
|
|
* MIT license ([LICENSE-MIT](LICENSE-MIT) or
|
|
http://opensource.org/licenses/MIT) at your option.
|
|
|
|
### Contribution
|
|
|
|
Unless you explicitly state otherwise, any contribution intentionally submitted
|
|
for inclusion in the work by you shall be dual licensed as above, without any
|
|
additional terms or conditions.
|
|
|
|
[rust]: https://www.rust-lang.org/
|
|
[mir]: https://github.com/rust-lang/rfcs/blob/master/text/1211-mir.md
|
|
[usask]: https://www.usask.ca/
|
|
[rustup]: https://www.rustup.rs
|