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* [[Rust_Update_Policy_for_Firefox|Rust Update Policy for Firefox]]
* [[Rust_Update_Policy_for_Firefox|Rust Update Policy for Firefox]]


Writing code
Rust in Firefox docs
* [https://developer.mozilla.org/en-US/Firefox/Building_Firefox_with_Rust_code Developer Documentation]
* [https://firefox-source-docs.mozilla.org/build/buildsystem/rust.html Adding Rust code]
* [https://firefox-source-docs.mozilla.org/build/buildsystem/rust.html Build System Documentation]
* [https://firefox-source-docs.mozilla.org/writing-rust-code/index.html Writing Rust code]
* [https://docs.google.com/presentation/d/1qkPwISU1BvsTVyqLuVhisSMuIS_DiXb8X09-boszcu0/edit#slide=id.g5bfdbbe5c9_0_71 How to build an XPCOM component in Rust]
* [https://firefox-source-docs.mozilla.org/testing-rust-code/index.html Testing & debugging Rust code]
* [https://groups.google.com/forum/#!topic/mozilla.dev.platform/u8scZop3FkM In-tree helper crates for Rust XPCOM components]
* [https://crisal.io/words/2020/02/28/C++-rust-ffi-patterns-1-complex-data-structures.html FFI patterns #1 - Complex Rust data structures exposed seamlessly to C++]


Getting help
Getting extra help
* The Rust channel on [https://wiki.mozilla.org/Matrix Mozilla's Matrix network] contains lots of people who know about both Rust and Gecko.
* The Rust channel on [https://wiki.mozilla.org/Matrix Mozilla's Matrix network] contains lots of people who know about both Rust and Gecko.
* Are you new to Rust and not sure if your Rust code could be improved? The following people can review Rust patches for Firefox from an "is this good Rust code?" point of view.
* Are you new to Rust and not sure if your Rust code could be improved? The following people can review Rust patches for Firefox from an "is this good Rust code?" point of view.
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** Nika Layzell (:nika)
** Nika Layzell (:nika)
** Cameron McCormack (:heycam)
** Cameron McCormack (:heycam)
== FAQ ==
'''Q:''' How are in-tree Rust crates tested?<br />
'''A:''' In general we don't run tests for third-party crates; the assumption is that these crates are sufficiently well-tested elsewhere. (Which means that large test fixtures should be removed when vendoring third-party crates, because they just bloat mozilla-central.) Mozilla crates can be tested with <tt>cargo test</tt> by adding them to <tt>RUST_TESTS</tt> in <tt>toolkit/library/rust/moz.build</tt>. Alternatively, you can write a GTest that uses FFI to call into Rust code.


= Rust Components =
= Rust Components =
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* U2F HID backend: {{bug|1388843}} (shipped in Firefox 57)
* U2F HID backend: {{bug|1388843}} (shipped in Firefox 57)
* libcubeb Audio backend for Linux (PulseAudio): {{bug|1346665}} (shipped in Firefox 59)
* libcubeb Audio backend for Linux (PulseAudio): {{bug|1346665}} (shipped in Firefox 59)
* libcubeb Audio backend for macOS (CoreAudio): {{bug|1530713}} (shipped in Firefox 74)
** '''Why Rust?''' Safer implementation avoids data racing by leveraging lifetime, variable mutability check and better mutex pattern.
* XPIDL binding generator ({{bug|1293362}}) (shipped in Firefox 60)
* XPIDL binding generator ({{bug|1293362}}) (shipped in Firefox 60)
* New prefs parser: {{bug|1423840}} (shipped in Firefox 60)
* New prefs parser: {{bug|1423840}} (shipped in Firefox 60)
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* Integrate [https://github.com/projectfluent/fluent-rs fluent-rs], a localization system: {{bug|1560038}} (shipped in Firefox 76)
* Integrate [https://github.com/projectfluent/fluent-rs fluent-rs], a localization system: {{bug|1560038}} (shipped in Firefox 76)
** '''Why Rust?''' Performance and memory wins are substantial over previous JS implementation. It brings zero-copy parsing, and memory savvy resolving of localization strings. It also paves the way for migrating the rest of the Fluent APIs away from JS which is required for Fission.
** '''Why Rust?''' Performance and memory wins are substantial over previous JS implementation. It brings zero-copy parsing, and memory savvy resolving of localization strings. It also paves the way for migrating the rest of the Fluent APIs away from JS which is required for Fission.
* qcms [https://searchfox.org/mozilla-central/source/gfx/qcms] ported from C to Rust
** '''Why Rust?''' Memory safety


=== In progress ===
=== In progress ===
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* Linebreaking with xi-unicode: {{bug|1290022}} (last update late 2016)
* Linebreaking with xi-unicode: {{bug|1290022}} (last update late 2016)
* Background Update Agent for Windows: {{bug|1343669}}
* Background Update Agent for Windows: {{bug|1343669}}
* libcubeb Audio backend for macOS (CoreAudio): {{bug|1530715}} (in Nightly since 70?)
* [https://github.com/gfx-rs/wgpu wgpu], a [https://gpuweb.github.io/gpuweb/ WebGPU] API implementation: {{bug|webgpu-mvp}} (in Nightly since 72)
* [https://github.com/gfx-rs/wgpu wgpu], a [https://gpuweb.github.io/gpuweb/ WebGPU] API implementation: {{bug|webgpu-mvp}} (in Nightly since 72)
** '''Why Rust?''' Complex tracking logic, wide attack area. Also, leverages Rust ecosystem for building libraries on top of our native implementation and the API that will target the Web.
** '''Why Rust?''' Complex tracking logic, wide attack area. Also, leverages Rust ecosystem for building libraries on top of our native implementation and the API that will target the Web.
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This section lists areas where Rust integration could be improved.
This section lists areas where Rust integration could be improved.
* Tracking bug: Make the developer experience for Firefox + Rust great: {{Bug|rust-great}}
* Tracking bug: Make the developer experience for Firefox + Rust great: {{Bug|rust-great}}
* Compile speed and memory usage
* [https://docs.google.com/document/d/16FgQPRxNb-Z6sfJy_P7edXzMVWE86jJEZVbmV0oC-m0/ 2020 Questionnaire results]
** Incremental compilation ([https://github.com/rust-lang/rust/labels/A-incr-comp A-incr-comp issues], [https://github.com/rust-lang/rust/labels/WG-compiler-incr WG-compiler-incr issues])
* [https://docs.google.com/document/d/1puZvhWaURtViz8OC0HkB0h2dqJThVyAgLGFbIQpd4fo/ Oxidation 2020 Plan]
** [https://users.rust-lang.org/t/contract-opportunity-mozilla-distributed-compilation-cache-written-in-rust/13898 Distributed compilation cache]
** [https://github.com/rust-lang/cargo/issues/1997 Artifact caching]?
* Debugging: improve gdb and lldb support for Rust. The first step is to establish Rust language support in DWARF distinct from the existing C++ support.
* Bindings/interop
** Immature rust-bindgen and cbindgen tools for general cross-language support. Working aroudn clang bugs in different versions and on different platforms can be tricky.
** No IPDL binding generator ({{bug|1379739}})
** No WebIDL binding generator for DOM components (Servo must have something here?)
* Remaining minor crash report issues {{bug|1348896}}
* IDE/symbol lookup support?
* Code coverage?
* Profiling improvements? Especially for parallel code
* Test integration?


= Meetings =
= Meetings =
Jrmuizel
Confirmed users
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