Rollup of 6 pull requests #99825

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

Add a `platform-support` entry to the rustc-docs for the different `*-unknown-uefi` targets. This describes in detail how this platform works, a few basic examples, and how to compile for the platform. Red Hat is sponsoring my work on this platform, so I am putting myself down as target maintainer. Co-maintainers are more than welcome to join me in the effort. Communication is going on off-list to coordinate the different efforts. Note that the ultimate goal is to move the UEFI targets to Tier-2 so bootloaders can be more easily supported in commercial products. This documentation is the first step towards that goal, but should be a viable documentation even for the current Tier-3 status of the targets. I also want to point out that there is an ongoing GSoC-effort to port the rust standard library to UEFI (by Ayush Singh). While this work is not necessarily required to get to Tier-2, we definitely should coordinate the efforts and update the documentation as soon as any such ports are merged. Note that the targets are already used by multiple commercial and non commercial production systems, including, but not limited to: * Tianocore-EDK2 (Official UEFI SDK by Intel) comes with rust support in its staging repository (not part of any release, yet). (https://github.com/tianocore/edk2-staging/tree) * Intel's research program "Project Mu" uses the rust UEFI targets to show possible future replacements for Tianocore-EDK2. * The Rust OS "Redox" uses the UEFI targets for its bootloader. (https://www.redox-os.org/) * The hugely popular in-depth documentation of OS development in Rust by Philipp Oppermann uses the UEFI targets. (https://os.phil-opp.com/) Signed-off-by: David Rheinsberg <david.rheinsberg@gmail.com>

This fixes a regression from stable to nightly. Closes rust-lang#99502.

This initial implementation handles transmutations between types with specified layouts, except when references are involved. Co-authored-by: Igor null <m1el.2027@gmail.com>

ref: https://github.com/rust-lang/rust/pull/92268/files#r925244819

ref: https://github.com/rust-lang/rust/pull/92268/files#r925258420

…eldDef` Exhaustively destructure parameter(s) so that changes to type definitions will lead to compile errors, thus reminding contributors to re-assess the assumptions underpinning these impls. ref: rust-lang#92268 ref: rust-lang#92268

ref: rust-lang#92268 (comment) ref: rust-lang#92268 (comment) ref: rust-lang#92268 (comment)

ref: rust-lang#92268 (comment)

Initial implementation of transmutability trait. *T'was the night before Christmas and all through the codebase, not a miri was stirring — no hint of `unsafe`!* This PR provides an initial, **incomplete** implementation of *[MCP 411: Lang Item for Transmutability](rust-lang/compiler-team#411. The `core::mem::BikeshedIntrinsicFrom` trait provided by this PR is implemented on-the-fly by the compiler for types `Src` and `Dst` when the bits of all possible values of type `Src` are safely reinterpretable as a value of type `Dst`. What this PR provides is: - [x] [support for transmutations involving primitives](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/primitives) - [x] [support for transmutations involving arrays](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/arrays) - [x] [support for transmutations involving structs](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/structs) - [x] [support for transmutations involving enums](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/enums) - [x] [support for transmutations involving unions](https://github.com/jswrenn/rust/tree/transmute/src/test/ui/transmutability/unions) - [x] [support for weaker validity checks](https://github.com/jswrenn/rust/blob/transmute/src/test/ui/transmutability/unions/should_permit_intersecting_if_validity_is_assumed.rs) (i.e., `Assume::VALIDITY`) - [x] visibility checking What isn't yet implemented: - [ ] transmutability options passed using the `Assume` struct - [ ] [support for references](https://github.com/jswrenn/rust/blob/transmute/src/test/ui/transmutability/references.rs) - [ ] smarter error messages These features will be implemented in future PRs.

Allow using stable os::fd::raw items through unstable os::wasi module This fixes a regression from stable to nightly. Closes rust-lang#99502.

doc/rustc: describe the uefi target platforms Add a `platform-support` entry to the rustc-docs for the different `*-unknown-uefi` targets. This describes in detail how this platform works, a few basic examples, and how to compile for the platform. Red Hat is sponsoring my work on this platform, so I am putting myself down as target maintainer. Co-maintainers are more than welcome to join me in the effort. Communication is going on off-list to coordinate the different efforts. Note that the ultimate goal is to move the UEFI targets to Tier-2 so bootloaders can be more easily supported in commercial products. This documentation is the first step towards that goal, but should be a viable documentation even for the current Tier-3 status of the targets. I also want to point out that there is an ongoing GSoC-effort to port the rust standard library to UEFI (by Ayush Singh). While this work is not necessarily required to get to Tier-2, we definitely should coordinate the efforts and update the documentation as soon as any such ports are merged. Note that the targets are already used by multiple commercial and non commercial production systems, including, but not limited to: * Tianocore-EDK2 (Official UEFI SDK by Intel) comes with rust support in its staging repository (not part of any release, yet). (https://github.com/tianocore/edk2-staging/tree) * Intel's research program "Project Mu" uses the rust UEFI targets to show possible future replacements for Tianocore-EDK2. * The Rust OS "Redox" uses the UEFI targets for its bootloader. (https://www.redox-os.org/) * The hugely popular in-depth documentation of OS development in Rust by Philipp Oppermann uses the UEFI targets. (https://os.phil-opp.com/)

…ler-errors Update mentions to `rustc_metadata::rmeta::Lazy` While working on rust-lang/rustc-dev-guide#1411, I noticed there are still some mentions of `Lazy`. This updates them to `LazyValue`, `LazyArray`, or `LazyTable`. r? `@compiler-errors` Signed-off-by: Yuki Okushi <jtitor@2k36.org>

…small-width, r=notriddle Fix settings slider on small width screens Fixes rust-lang#99794. Screenshot of the fix: ![Screenshot from 2022-07-27 14-17-08](https://user-images.githubusercontent.com/3050060/181250007-55f982d1-89db-45b7-a4f1-0d1729e6a3e3.png) cc `@jsha` r? `@notriddle`

…oval, r=GuillaumeGomez rustdoc: remove Clean trait impls for more items Follow up to rust-lang#99638 and rust-lang#99672

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Rollup of 6 pull requests #99825

Rollup of 6 pull requests #99825

Commits on Jul 27, 2022