Rollup of 9 pull requests
Successful merges:
- #125829 (rustc_span: Add conveniences for working with span formats)
- #126361 (Unify intrinsics body handling in StableMIR)
- #126417 (Add `f16` and `f128` inline ASM support for `x86` and `x86-64`)
- #126424 ( Also sort `crt-static` in `--print target-features` output)
- #126428 (Polish `std::path::absolute` documentation.)
- #126429 (Add `f16` and `f128` const eval for binary and unary operationations)
- #126448 (End support for Python 3.8 in tidy)
- #126488 (Use `std::path::absolute` in bootstrap)
- #126511 (.mailmap: Associate both my work and my private email with me)
r? `@ghost`
`@rustbot` modify labels: rollup
Add `f16` and `f128` const eval for binary and unary operationations
Add const evaluation and Miri support for f16 and f128, including unary and binary operations. Casts are not yet included.
Fixes https://github.com/rust-lang/rust/issues/124583
r? ``@RalfJung``
Polish `std::path::absolute` documentation.
These changes bring it closer to other standard library documentation and, in particular, `std::fs::canonicalize`, which it will often be compared with.
* Add `# Platform-specific behavior` section, with content moved from Examples section.
* Create `# Errors` section.
* Phrase error description to allow future platforms to have new syntactic errors, rather than only emptiness.
* Add missing commas.
* Indent example code 4 spaces.
Also sort `crt-static` in `--print target-features` output
I didn't find `crt-static` at first (for `x86_64-unknown-linux-gnu`), because it was put at the bottom of the large and otherwise sorted list.
Fully sort the list before we print it.
Note that `llvm_target_features` starts out and remains sorted and does not need to be sorted an extra time.
On my machine the diff is just:
```diff
$ diff -u /tmp/before2.txt /tmp/after2.txt
--- /tmp/before2.txt 2024-06-13 20:40:27.091636592 +0200
+++ /tmp/after2.txt 2024-06-13 20:39:54.584894891 +0200
``@@`` -20,6 +20,7 ``@@``
bmi1 - Support BMI instructions.
bmi2 - Support BMI2 instructions.
cmpxchg16b - 64-bit with cmpxchg16b (this is true for most x86-64 chips, but not the first AMD chips).
+ crt-static - Enables C Run-time Libraries to be statically linked.
ermsb - REP MOVS/STOS are fast.
f16c - Support 16-bit floating point conversion instructions.
fma - Enable three-operand fused multiple-add.
``@@`` -49,7 +50,6 ``@@``
xsavec - Support xsavec instructions.
xsaveopt - Support xsaveopt instructions.
xsaves - Support xsaves instructions.
- crt-static - Enables C Run-time Libraries to be statically linked.
Code-generation features supported by LLVM for this target:
16bit-mode - 16-bit mode (i8086).
```
I couldn't find a ui test that tested this output. Let's see if CI finds a regression tests.
Add `f16` and `f128` inline ASM support for `x86` and `x86-64`
This PR adds `f16` and `f128` input and output support to inline ASM on `x86` and `x86-64`. `f16` vector sizes are taken from [here](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html).
Relevant issue: #125398
Tracking issue: #116909
``@rustbot`` label +F-f16_and_f128
Unify intrinsics body handling in StableMIR
rust-lang/rust#120675 introduced a new mechanism to declare intrinsics which will potentially replace the rust-intrinsic ABI.
The new mechanism introduces a placeholder body and mark the intrinsic with `#[rustc_intrinsic_must_be_overridden]`.
In practice, this means that a backend should not generate code for the placeholder, and shim the intrinsic.
The new annotation is an internal compiler implementation, and it doesn't need to be exposed to StableMIR users.
In this PR, we unify the interface for intrinsics marked with `rustc_intrinsic_must_be_overridden` and intrinsics that do not have a body.
Fixes https://github.com/rust-lang/project-stable-mir/issues/79
r? ``@oli-obk``
cc: ``@momvart``
Rollup of 9 pull requests
Successful merges:
- #126354 (Use `Variance` glob imported variants everywhere)
- #126367 (Point out failing never obligation for `DEPENDENCY_ON_UNIT_NEVER_TYPE_FALLBACK`)
- #126469 (MIR Shl/Shr: the offset can be computed with rem_euclid)
- #126471 (Use a consistent way to filter out bounds instead of splitting it into three places)
- #126472 (build `libcxx-version` only when it doesn't exist)
- #126497 (delegation: Fix hygiene for `self`)
- #126501 (make bors ignore comments in PR template)
- #126509 (std: suggest OnceLock over Once)
- #126512 (Miri subtree update)
r? `@ghost`
`@rustbot` modify labels: rollup
std: suggest OnceLock over Once
It was noted in https://github.com/rust-lang/rust/issues/125615#issuecomment-2149590818 that Once is not necessary in most cases and should be discouraged. Once is really just an implementation detail of OnceLock that others can use if they want. Suggest they use OnceLock instead.
delegation: Fix hygiene for `self`
And fix diagnostics for `self` from a macro.
The missing rib caused `self` to be treated as a generic parameter and ignore `macro_rules` hygiene.
Addresses this comment https://github.com/rust-lang/rust/pull/124135#discussion_r1637492234.
build `libcxx-version` only when it doesn't exist
In https://github.com/rust-lang/rust/issues/126423, it seems like c++ parsing takes quite amount of time on bootstrap startups. This PR makes libcxx-version to be compiled only when it doesn't exist.
A simple demonstration on the overhead of buiding `libcxx-version`:
```sh
$ rm -rf build/host/libcxx-version
$ x build
Building bootstrap
Finished `dev` profile [unoptimized] target(s) in 0.07s
----- LIBCXX VERSION CHECK TOOK: 509ms
Building tool rustdoc (stage1 -> stage2, x86_64-unknown-linux-gnu)
Finished `release` profile [optimized] target(s) in 0.25s
Build completed successfully in 0:00:02
$ x build
Building bootstrap
Finished `dev` profile [unoptimized] target(s) in 0.07s
----- LIBCXX VERSION CHECK TOOK: 2ms
Creating a sysroot for stage2 compiler (use `rustup toolchain link 'name' build/host/stage2`)
Building tool rustdoc (stage1 -> stage2, x86_64-unknown-linux-gnu)
Finished `release` profile [optimized] target(s) in 0.14s
Build completed successfully in 0:00:01
```
Use a consistent way to filter out bounds instead of splitting it into three places
just a small cleanup, no logic change.
Initially the code had me looking for why anything was special here, only to realize there's nothing interesting going on
Point out failing never obligation for `DEPENDENCY_ON_UNIT_NEVER_TYPE_FALLBACK`
Based on top of #125289, so just need to look at the last commit.
r? `@WaffleLapkin`
Use `Variance` glob imported variants everywhere
Fully commit to using the globbed variance. Could be convinced the other way, and change this PR to not use the globbed variants anywhere, but I'd rather we do one or the other.
r? lcnr
cargo miri: add support for '--many-seeds'
to run the program / tests many times with different seeds: `cargo miri run --many-seeds` / `cargo miri test --many-seeds`.
`@rust-lang/miri` any opinion on the flag name here? Should it be `-Zmiri-many-seeds` or is `--many-seeds` fine?
Fixes https://github.com/rust-lang/miri/issues/3546
Add `TyCtxt::is_lang_item`, use it in the compiler
```rust
pub fn is_lang_item(self, def_id: DefId, lang_item: LangItem) -> bool;
```
Easier than having to use `Some(def_id) == tcx.lang_items().iterator_trait()` or something. Also makes it easier to turn into `TraitSolverLangItem` in the future. Hope it's not too bad for perf.
r? `@lcnr` or `@oli-obk`
Don't build a broken/untested profiler runtime on mingw targets
Context: https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/Why.20build.20a.20broken.2Funtested.20profiler.20runtime.20on.20mingw.3F#75872 added `--enable-profiler` to the `x86_64-mingw` job (to cause some additional tests to run), but had to also add `//@ ignore-windows-gnu` to all of the tests that rely on the profiler runtime actually *working*, because it's broken on that target.
We can achieve a similar outcome by going through all the `//@ needs-profiler-support` tests that don't actually need to produce/run a binary, and making them use `-Zno-profiler-runtime` instead, so that they can run even in configurations that don't have the profiler runtime available. Then we can remove `--enable-profiler` from `x86_64-mingw`, and still get the same amount of testing.
This PR also removes `--enable-profiler` from the mingw dist builds, since it is broken/untested on that target. Those builds have had that flag for a very long time.
These changes bring it closer to other standard library documentation
and, in particular, `std::fs::canonicalize`, which it will often be
compared with.
* Add `# Platform-specific behavior` section, with content moved from
Examples section.
* Create `# Errors` section.
* Phrase error description to allow future platforms to have new
syntactic errors, rather than only emptiness.
* Add missing commas.
* Indent example code 4 spaces.
I didn't find `crt-static` at first (for `x86_64-unknown-linux-gnu`),
because it was put at the bottom the large and otherwise sorted list.
Fully sort the list before we print it.
Note that `llvm_target_features` starts out sorted and does not need to
be sorted an extra time.
Add a new concat metavar expr
Revival of #111930
Giving it another try now that #117050 was merged.
With the new rules, meta-variable expressions must be referenced with a dollar sign (`$`) and this can cause misunderstands with `$concat`.
```rust
macro_rules! foo {
( $bar:ident ) => {
const ${concat(VAR, bar)}: i32 = 1;
};
}
// Will produce `VARbar` instead of `VAR_123`
foo!(_123);
```
In other words, forgetting the dollar symbol can produce undesired outputs.
cc #29599
cc https://github.com/rust-lang/rust/issues/124225
Rollup of 7 pull requests
Successful merges:
- #123769 (Improve escaping of byte, byte str, and c str proc-macro literals)
- #126054 (`E0229`: Suggest Moving Type Constraints to Type Parameter Declaration)
- #126135 (add HermitOS support for vectored read/write operations)
- #126266 (Unify guarantees about the default allocator)
- #126285 (`UniqueRc`: support allocators and `T: ?Sized`.)
- #126399 (extend the check for LLVM build)
- #126426 (const validation: fix ICE on dangling ZST reference)
r? `@ghost`
`@rustbot` modify labels: rollup
const validation: fix ICE on dangling ZST reference
Fixes https://github.com/rust-lang/rust/issues/126393
I'm not super happy with this fix but I can't think of a better one.
r? `@oli-obk`
`UniqueRc`: support allocators and `T: ?Sized`.
Added the following (all unstable):
* Defaulted type pararameter `A: Allocator`.
* `UniqueRc::new_in()`.
* `T: ?Sized` where possible.
* `impl CoerceUnsized for UniqueRc`.
These changes are motivated by supporting the implementation of unsized `Rc::make_mut()` (PR #116113), but are also intended to be obvious generalizations of `UniqueRc` to support the things `Rc` does.
r? ``````@the8472``````
Unify guarantees about the default allocator
`std::alloc` said that the default allocator is unspecified for all crrate types except `cdylib` and `staticlib`. Adjust `std::alloc::System` documentation to say the same.
Fixes#125870.
