Update stdarch submodule
`asm_experimental_arch` is required in `core` as we're now using unstable inline assembly when building Arm64EC.
Brings in the fix for <https://github.com/rust-lang/stdarch/issues/1555> (cc `@tslnc04).`
r? `@Amanieu`
Call the panic hook for non-unwind panics in proc-macros
As I suggested in https://github.com/rust-lang/rust/issues/123286#issuecomment-2030344815.
If a proc macro causes a non-unwinding panic, `proc_macro` isn't able to catch the unwind and report the panic as a compile error by passing control back to the compiler. Our only chance to produce any diagnostic is the panic hook, so we should call it.
This scenario has already existed, but has become a lot more interesting now that we're adding more UB-detecting panics to the standard library, and such panics do not unwind.
Add a `Debug` impl and some basic functions to `f16` and `f128`
`compiler_builtins` uses some convenience functions like `is_nan` and `is_sign_positive`. Add these, as well as a temporary implementation for `Debug` that prints the bit representation.
Refactor `panic_unwind/seh.rs` pointer use
* `x86` now conforms to strict-provenance
* `x86_64` now uses the expose API (instead of `as` casts)
* changed `ptr_t` from a type alias to a `repr(transparent)` struct for some extra type-safety
* replaced the `ptr!` macro by methods on `ptr_t`, as there is now no reason (as far as I can see) anymore to use a macro
On `x86_64` pointers in SEH are represented by 32-bit offsets from `__ImageBase`, so we can't use a pointer type. It might be possible to leak the provenance into the FFI by using a `MaybeUninit<u32>` instead of a `u32`, but that is a bit more involved than using expose, and I'm not sure that would be worth it.
Move rare overflow error to a cold function
`scoped.spawn()` generates unnecessary inlined panic-formatting code for a branch that will never be taken.
Rollup of 8 pull requests
Successful merges:
- #122882 (Avoid a panic in `set_output_capture` in the default panic handler)
- #123523 (Account for trait/impl difference when suggesting changing argument from ref to mut ref)
- #123744 (Silence `unused_imports` for redundant imports)
- #123784 (Replace `document.write` with `document.head.insertAdjacent`)
- #123798 (Avoid invalid socket address in length calculation)
- #123804 (Stop using `HirId` for fn-like parents since closures are not `OwnerNode`s)
- #123806 (Panic on overflow in `BorrowedCursor::advance`)
- #123820 (Add my former address to .mailmap)
r? `@ghost`
`@rustbot` modify labels: rollup
Panic on overflow in `BorrowedCursor::advance`
Passing `usize::MAX` to `advance` clearly isn't correct, but the current assertion fails to detect this when overflow checks are disabled. This isn't unsound, but should probably be fixed regardless.
Avoid invalid socket address in length calculation
This has no effect on the lengths of these constants, but since the IP address portion of the socket addresses was intentionally chosen to be the largest valid value, it seems appropriate to also use the largest valid value for the other components (as opposed to invalid values exceeding the possible ranges).
Avoid a panic in `set_output_capture` in the default panic handler
This avoid a panic in the default panic handler by not using `set_output_capture` as `OUTPUT_CAPTURE.with` may panic once `OUTPUT_CAPTURE` is dropped.
A new non-panicking `try_set_output_capture` variant of `set_output_capture` is added for use in the default panic handler.
`compiler_builtins` uses some convenience functions like `is_nan` and
`is_sign_positive`. Add these, as well as a temporary implementation for
`Debug` that prints the bit representation.
clean up docs for `File::sync_*`
* Clarify that `sync_all` also writes data and not just metadata.
* Clarify that dropping a file is not equivalent to calling `sync_all` and ignoring the result. `sync_all` the still the recommended way to detect errors before closing, because we don't have a dedicated method for that.
* Add a link from `sync_all` to `sync_data`, because that's what the user might want to use instead.
* Add doc aliases for `fsync` -> `sync_all` and `fdatasync` -> `sync_data`. Those are the POSIX standard names for these functions. I was trying to find out what we call `fsync` in Rust and had to search through the source code to find it, so this alias should help with that in the future.
Document restricted_std
This PR aims to pin down exactly what restricted_std is meant to achieve and what it isn't.
This commit fixes https://github.com/rust-lang/wg-cargo-std-aware/issues/87 by explaining why the error appears and what the choices the user has. The error describes how std cannot function without knowing about some form of OS/platform support. Any features of std that work without an OS should be moved to core/alloc (see https://github.com/rust-lang/rust/issues/27242https://github.com/rust-lang/rust/issues/103765).
Note that the message says "platform" and "environment" because, since https://github.com/rust-lang/rust/pull/120232, libstd can be built for some JSON targets. This is still unsupported (all JSON targets probably should be unstable https://github.com/rust-lang/wg-cargo-std-aware/issues/90), but a JSON target with the right configuration should hopefully have some partial libstd support.
I propose closing https://github.com/rust-lang/wg-cargo-std-aware/issues/69 as "Won't fix" since any support of std without properly configured os, vendor or env fields is very fragile considering future upgrades of Rust or dependencies. In addition there's no likely path to it being fixed long term (making std buildable for all targets being the only solution). This is distinct from tier 3 platforms with limited std support implemented (and as such aren't restricted_std) because these platforms can conceptually work in the future and std support should mainly improve over time.
The alternative to closing https://github.com/rust-lang/wg-cargo-std-aware/issues/69 is a new crate feature for std which escapes the restricted_std mechanism in build.rs. It could be used with the -Zbuild-std-features flag if we keep it permanently unstable, which I hope we can do anyway. A minor side-effect in this scenario is that std wouldn't be marked as unstable if documentation for it were generated with build-std.
cc ```@ehuss```
`f16` and `f128` step 4: basic library support
This is the next step after https://github.com/rust-lang/rust/pull/121926, another portion of https://github.com/rust-lang/rust/pull/114607
Tracking issue: https://github.com/rust-lang/rust/issues/116909
This PR adds the most basic operations to `f16` and `f128` that get lowered as LLVM intrinsics. This is a very small step but it seemed reasonable enough to add unopinionated basic operations before the larger modules that are built on top of them.
r? ```@Amanieu``` since you were pretty involved in the RFC
cc ```@compiler-errors```
```@rustbot``` label +T-libs-api +S-blocked +F-f16_and_f128
This reverts commit 049a917535.
The resolution to <https://github.com/rust-lang/rust/issues/123282> is
that the `f16`/`f128` regression in the beta compiler was fixable
without a revert, so the commit adding `#[cfg(not(bootstrap))]` is no
longer useful (added in
<https://github.com/rust-lang/rust/pull/123390>).
Revert this commit because not having these basic impls bootstrap-gated
simplifies everything else that uses them.
Rollup of 7 pull requests
Successful merges:
- #118391 (Add `REDUNDANT_LIFETIMES` lint to detect lifetimes which are semantically redundant)
- #123534 (Windows: set main thread name without re-encoding)
- #123659 (Add support to intrinsics fallback body)
- #123689 (Add const generics support for pattern types)
- #123701 (Only assert for child/parent projection compatibility AFTER checking that theyre coming from the same place)
- #123702 (Further cleanup cfgs in the UI test suite)
- #123706 (rustdoc: reduce per-page HTML overhead)
r? `@ghost`
`@rustbot` modify labels: rollup
Specialize many implementations of `Read::read_buf_exact`
This makes all implementations of `Read` that have a specialized `read_exact` implementation also have one for `read_buf_exact`.
Show mode_t as octal in std::fs Debug impls
Example:
```rust
fn main() {
println!("{:?}", std::fs::metadata("Cargo.toml").unwrap().permissions());
}
```
- Before: `Permissions(FilePermissions { mode: 33204 })`
- ~~After: `Permissions(FilePermissions { mode: 0o100664 })`~~
- After: `Permissions(FilePermissions { mode: 0o100664 (-rw-rw-r--) })`
~~I thought about using the format from `ls -l` (`-rw-rw-r--`, `drwxrwxr-x`) but I am not sure how transferable the meaning of the higher bits between different unix systems, and anyway starting the value with a leading negative-sign seems objectionable.~~
Store all args in the unsupported Command implementation
This allows printing them in the Debug impl as well as getting them again using the get_args() method. This allows programs that would normally spawn another process to more easily show which program they would have spawned if not for the fact that the target doesn't support spawning child processes without requiring intrusive changes to keep the args. For example rustc compiled to wasi will show the full linker invocation that would have been done.
