Matthias Krüger [Wed, 27 Oct 2021 04:11:36 +0000 (06:11 +0200)]
Rollup merge of #90232 - konan8205:master, r=GuillaumeGomez
rustdoc: Use TTF based font instead of OTF for CJK glyphs to improve readability
Due to Windows' implementation of font rendering, OpenType fonts can be distorted. So the existing font, Noto Sans KR, is not very readable on Windows. This PR improves readability of Korean glyphs on Windows.
Matthias Krüger [Tue, 26 Oct 2021 17:32:44 +0000 (19:32 +0200)]
Rollup merge of #90296 - CAD97:rip-lerp, r=Mark-Simulacrum
Remove fNN::lerp
Lerp is [surprisingly complex with multiple tradeoffs depending on what guarantees you want to provide](https://github.com/rust-lang/rust/issues/86269#issuecomment-869108301) (and what you're willing to drop for raw speed), so we don't have consensus on what implementation to use, let alone what signature - `t.lerp(a, b)` nicely puts `a, b` together, but makes dispatch to lerp custom types with the same signature basically impossible, and major ecosystem crates (e.g. nalgebra, glium) use `a.lerp(b, t)`, which is easily confusable. It was suggested to maybe provide a `Lerp<T>` trait and `t.lerp([a, b])`, which _could_ be implemented by downstream math libraries for their types, but also significantly raises the bar from a simple fNN method to a full trait, and does nothing to solve the implementation question. (It also raises the question of whether we'd support higher-order bezier interpolation.)
The only consensus we have is the lack of consensus, and the [general temperature](https://github.com/rust-lang/rust/issues/86269#issuecomment-951347135) is that we should just remove this method (giving the method space back to 3rd party libs) and revisit this if (and likely only if) IEEE adds lerp to their specification.
If people want a lerp, they're _probably_ already using (or writing) a math support library, which provides a lerp function for its custom math types and can provide the same lerp implementation for the primitive types via an extension trait.
See also [previous Zulip discussion](https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/lerp.20API.20design)
cc ``@clarfonthey`` (original PR author), ``@m-ou-se`` (original r+), ``@scottmcm`` (last voice in tracking issue, prompted me to post this)
bors [Tue, 26 Oct 2021 11:45:13 +0000 (11:45 +0000)]
Auto merge of #90284 - tonyyzy:patch-1, r=JohnTitor
Remove redundant Aligner
The `Aligner` struct seems to be unnecessary.
Previously noted by `@arthurprs` https://github.com/rust-lang/rust/pull/44963#discussion_r145340754
Reddit discussion: https://www.reddit.com/r/rust/comments/pfvvz2/aligner_and_cachealigned/
Playground: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=fa7ca554922755f9d1b62b017d785c6f
Tony Yang [Tue, 26 Oct 2021 10:34:03 +0000 (11:34 +0100)]
Remove redundant Aligner
The `Aligner` struct seems to be unnecessary.
Previously noted by @arthurprs https://github.com/rust-lang/rust/pull/44963#discussion_r145340754
Reddit discussion: https://www.reddit.com/r/rust/comments/pfvvz2/aligner_and_cachealigned/
Playground: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=fa7ca554922755f9d1b62b017d785c6f
bors [Tue, 26 Oct 2021 04:44:51 +0000 (04:44 +0000)]
Auto merge of #90299 - matthiaskrgr:rollup-n77ntld, r=matthiaskrgr
Rollup of 4 pull requests
Successful merges:
- #90181 (fix(rustc_typeck): report function argument errors on matching type)
- #90241 (Make thiscall abi on unsupported platforms a hard error)
- #90294 (Update books)
- #90295 (Update cargo)
Matthias Krüger [Tue, 26 Oct 2021 04:14:08 +0000 (06:14 +0200)]
Rollup merge of #90294 - ehuss:update-books, r=ehuss
Update books
## nomicon
3 commits in 2d66852a27c5d0ec50ae021820d1de22caa2b1bd..358e6a61d5f4f0496d0a81e70cdcd25d05307342
2021-10-07 19:00:37 +0900 to 2021-10-20 11:23:12 -0700
- Write a basic "call Rust from C" example (rust-lang/nomicon#296)
- Clarify the Safe vs. Unsafe Rust relationship (rust-lang/nomicon#294)
- Fix typo with respect to dangling pointer (rust-lang/nomicon#319)
## book
8 commits in eb1282ec444db94055fa9531b6f3f803e86bb382..fd9299792852c9a368cb236748781852f75cdac6
2021-09-16 21:17:09 -0400 to 2021-10-22 21:59:46 -0400
- Reword description to emphasize what return does in a match arm
- Correct backwards wording describing From impls. Fixes rust-lang/book#2829
- Remove multiple negatives, add examples. Fixes rust-lang/book#2833
- Fix capitalization in sidebar. Fixes rust-lang/book#2860
- fix quotes
- comments from nostarch and responses for chapter 2
- (rust-lang/book#2906)
- Merge pull request rust-lang/book#2892 from Enrico2/patch-1
Matthias Krüger [Tue, 26 Oct 2021 04:14:07 +0000 (06:14 +0200)]
Rollup merge of #90241 - DrMeepster:thiscall_lint_upgrade, r=petrochenkov
Make thiscall abi on unsupported platforms a hard error
As suggested in https://github.com/rust-lang/rust/issues/42202#issuecomment-950205016, this PR makes use of the `thiscall` abi on unsupported a hard error instead of a lint.
The changes introduced in https://github.com/rust-lang/rust/pull/87280 allowed for "duplicate" caller bounds candidates to be assembled that only differed in their default substs having been "exposed" or not and resulted in an ambiguity error during trait selection. To fix this we expose the defaults substs during the creation of the ParamEnv.
Matthias Krüger [Mon, 25 Oct 2021 20:59:47 +0000 (22:59 +0200)]
Rollup merge of #90196 - yanok:master, r=scottmcm
Fix and extent ControlFlow `traverse_inorder` example
Fix and extent ControlFlow `traverse_inorder` example
1. The existing example compiles on its own, but any usage fails to be monomorphised and so doesn't compile. Fix that by using Fn trait instead of FnMut.
2. Added an example usage of `traverse_inorder` showing how we can terminate the traversal early.
Matthias Krüger [Mon, 25 Oct 2021 20:59:46 +0000 (22:59 +0200)]
Rollup merge of #89581 - jblazquez:master, r=Mark-Simulacrum
Add -Z no-unique-section-names to reduce ELF header bloat.
This change adds a new compiler flag that can help reduce the size of ELF binaries that contain many functions.
By default, when enabling function sections (which is the default for most targets), the LLVM backend will generate different section names for each function. For example, a function `func` would generate a section called `.text.func`. Normally this is fine because the linker will merge all those sections into a single one in the binary. However, starting with [LLVM 12](https://github.com/llvm/llvm-project/commit/ee5d1a04), the backend will also generate unique section names for exception handling, resulting in thousands of `.gcc_except_table.*` sections ending up in the final binary because some linkers like LLD don't currently merge or strip these EH sections (see discussion [here](https://reviews.llvm.org/D83655)). This can bloat the ELF headers and string table significantly in binaries that contain many functions.
The new option is analogous to Clang's `-fno-unique-section-names`, and instructs LLVM to generate the same `.text` and `.gcc_except_table` section for each function, resulting in a smaller final binary.
The motivation to add this new option was because we have a binary that ended up with so many ELF sections (over 65,000) that it broke some existing ELF tools, which couldn't handle so many sections.
Here's our old binary:
```
$ readelf --sections old.elf | head -1
There are 71746 section headers, starting at offset 0x2a246508:
bors [Mon, 25 Oct 2021 14:40:45 +0000 (14:40 +0000)]
Auto merge of #90265 - GuillaumeGomez:rollup-gx3ficp, r=GuillaumeGomez
Rollup of 5 pull requests
Successful merges:
- #90017 (Add a couple tests for normalize under binder issues)
- #90079 (enable `i8mm` target feature on aarch64 and arm)
- #90233 (Tooltip overflow)
- #90257 (Changed slice.swap documentation for better readability)
- #90261 (Move back to linux builder on try builds)
Guillaume Gomez [Mon, 25 Oct 2021 14:34:55 +0000 (16:34 +0200)]
Rollup merge of #90261 - Mark-Simulacrum:fix-try, r=pietroalbini
Move back to linux builder on try builds
Apparently deleted the wrong line when trying to revert changes to try in #90100 which I now see still contains the do not merge commit -- maybe I forgot to force push the local changes I had pending or something.
Guillaume Gomez [Mon, 25 Oct 2021 14:34:54 +0000 (16:34 +0200)]
Rollup merge of #90257 - zommiommy:patch-1, r=m-ou-se
Changed slice.swap documentation for better readability
The example exchanges the letters "b" and "d", these can be easily confused and are hard to read for people with dyslexia.
Therefore, I changed the example to a more easily readable one.
This is just a small fix and it's not urgent by any means, but I spent 5 minutes trying to understand why I couldn't see any change so I fixed it.
Guillaume Gomez [Mon, 25 Oct 2021 14:34:52 +0000 (16:34 +0200)]
Rollup merge of #90079 - SparrowLii:i8mm, r=Amanieu
enable `i8mm` target feature on aarch64 and arm
As in https://github.com/rust-lang/stdarch/issues/1233, `i8mm` needs to be turned on to support the implementation of `vmmla` and `vusmmla`neon instructions in stdarch.
r? ``@Amanieu``
bors [Mon, 25 Oct 2021 08:22:07 +0000 (08:22 +0000)]
Auto merge of #90249 - matthiaskrgr:rollup-xwtfhq3, r=matthiaskrgr
Rollup of 4 pull requests
Successful merges:
- #89889 (Use the "nice E0277 errors"[1] for `!Send` `impl Future` from foreign crate)
- #90127 (Do not mention a reexported item if it's private)
- #90143 (tidy: Remove submodules from edition exception list)
- #90238 (Add alias for guillaume.gomez@huawei.com)
Matthias Krüger [Mon, 25 Oct 2021 05:54:13 +0000 (07:54 +0200)]
Rollup merge of #90127 - JohnTitor:fix-90113, r=estebank
Do not mention a reexported item if it's private
Fixes #90113
The _actual_ regression was introduced in #73652, then #88838 made it worse. This fixes the issue by not counting such an import as a candidate.
Matthias Krüger [Mon, 25 Oct 2021 05:54:12 +0000 (07:54 +0200)]
Rollup merge of #89889 - estebank:unmet-send-bound-on-foreign-future, r=tmandry
Use the "nice E0277 errors"[1] for `!Send` `impl Future` from foreign crate
Partly address #78543 by making the error quieter.
We don't have access to the `typeck` tables from foreign crates, so we
used to completely skip the new code when checking foreign crates. Now,
we carry on and don't provide as nice output (we don't clarify *what* is
making the `Future: !Send`), but at least we no longer emit a sea of
derived obligations in the output.
bors [Mon, 25 Oct 2021 05:28:07 +0000 (05:28 +0000)]
Auto merge of #89808 - tmiasko:llvm-multithreaded, r=nagisa
Cleanup LLVM multi-threading checks
The support for runtime multi-threading was removed from LLVM. Calls to
`LLVMStartMultithreaded` became no-ops equivalent to checking if LLVM
was compiled with support for threads http://reviews.llvm.org/D4216.
Esteban Kuber [Thu, 14 Oct 2021 17:57:39 +0000 (17:57 +0000)]
Use the "nice E0277 errors"[1] for `!Send` `impl Future` from foreign crate
Partly address #78543 by making the error quieter.
We don't have access to the `typeck` tables from foreign crates, so we
used to completely skip the new code when checking foreign crates. Now,
we carry on and don't provide as nice output (we don't clarify *what* is
making the `Future: !Send`), but at least we no longer emit a sea of
derived obligations in the output.
Ilya Yanok [Sat, 23 Oct 2021 09:40:46 +0000 (11:40 +0200)]
Fix and extend ControlFlow `traverse_inorder` example
1. The existing example compiles on its own, but any usage fails
to be monomorphised and so doesn't compile. Fix that by using
a mutable reference as an input argument.
2. Added an example usage of `traverse_inorder` showing how we
can terminate the traversal early.
bors [Sun, 24 Oct 2021 14:12:10 +0000 (14:12 +0000)]
Auto merge of #90235 - matthiaskrgr:rollup-7pqtevk, r=matthiaskrgr
Rollup of 6 pull requests
Successful merges:
- #89558 (Add rustc lint, warning when iterating over hashmaps)
- #90100 (Skip documentation for tier 2 targets on dist-x86_64-apple-darwin)
- #90155 (Fix alignment of method headings for scannability)
- #90162 (Mark `{array, slice}::{from_ref, from_mut}` as const fn)
- #90221 (Fix ICE when forgetting to `Box` a parameter to a `Self::func` call)
- #90234 (Temporarily turn overflow checks off for rustc-rayon-core)
Matthias Krüger [Sun, 24 Oct 2021 13:48:46 +0000 (15:48 +0200)]
Rollup merge of #90234 - rusticstuff:rustc-rayon-core-no-overflow-checks, r=Mark-Simulacrum
Temporarily turn overflow checks off for rustc-rayon-core
The rustc fork of Rayon has deadlock detection code which intermittently causes overflows in the CI (see https://github.com/rust-lang/rust/issues/90227). So, as a workaround, we unconditionally turn overflow checks off for this crate only.
This workaround should be removed once #90227 is fixed.
Note that `from_ref` methods require `const_raw_ptr_deref` feature (which seems totally fine, since it's being stabilized, see #89551), `from_mut` methods require `const_mut_refs` (which seems fine too since this PR marks `from_mut` functions as const unstable).
Matthias Krüger [Sun, 24 Oct 2021 13:48:44 +0000 (15:48 +0200)]
Rollup merge of #90155 - jsha:outdent-methods, r=GuillaumeGomez,camelid
Fix alignment of method headings for scannability
We sometimes use indentation to indicate something is a heading: The section that comes after is indented by 24px relative to the heading. However, the relationship between the "Implementations" section heading, the `impl` headings it contains, and the `pub fn` subheadings within each impl, is awkward. It goes **Implementations**, 15px indent, `impl`, 5px indent, `pub fn`, 4px indent, docblock.
I line up `impl` and `pub fn` with the `Implementations` heading, give `impl` a larger font size to indicate it is higher in the hierarchy, and indent the docblock a full 24px relative to their parent, matching the indents we use elsewhere to distinguish section headings. By letting the `pub fn` stick out to the left of the docblock, I think this makes methods significantly more scannable.
Matthias Krüger [Sun, 24 Oct 2021 13:48:43 +0000 (15:48 +0200)]
Rollup merge of #90100 - Mark-Simulacrum:speed-macos-ci, r=pietroalbini
Skip documentation for tier 2 targets on dist-x86_64-apple-darwin
I don't have an easy way to test this locally, but I believe it should work. Based on one log result should shave ~14 minutes off the dist-x86_64-apple builder (doesn't help with aarch64 dist or x86_64 test builder, so not actually decreasing total CI time most likely).
bors [Sun, 24 Oct 2021 06:29:41 +0000 (06:29 +0000)]
Auto merge of #90208 - Mark-Simulacrum:hash-bytes-fast, r=oli-obk
Specialize HashStable for [u8] slices
Particularly for ctfe-stress-4, the hashing of byte slices as part of the
MIR Allocation is quite hot. Previously, we were falling back on byte-by-byte
copying of the slice into the SipHash buffer (64 bytes long) before hashing a 64
byte chunk, and then doing that again and again; now we use the dedicated byte-slice write.
bors [Sat, 23 Oct 2021 20:59:29 +0000 (20:59 +0000)]
Auto merge of #90175 - cuviper:min-llvm-12, r=nagisa
Update the minimum external LLVM to 12
With this change, we'll have stable support for LLVM 12 and 13.
For reference, the previous increase to LLVM 10 was #83387,
and this replaces the pending increase to LLVM 11 in #90062.
Mark Rousskov [Sat, 23 Oct 2021 16:11:05 +0000 (12:11 -0400)]
Specialize HashStable for [u8] slices
Particularly for ctfe-stress-4, the hashing of byte slices as part of the
MIR Allocation is quite hot. Previously, we were falling back on byte-by-byte
copying of the slice into the SipHash buffer (64 bytes long) before hashing a 64
byte chunk, and then doing that again and again.
This should hopefully be an improvement for that code.
bors [Sat, 23 Oct 2021 15:53:50 +0000 (15:53 +0000)]
Auto merge of #90203 - matthiaskrgr:rollup-v215wew, r=matthiaskrgr
Rollup of 5 pull requests
Successful merges:
- #85833 (Scrape code examples from examples/ directory for Rustdoc)
- #88041 (Make all proc-macro back-compat lints deny-by-default)
- #89829 (Consider types appearing in const expressions to be invariant)
- #90168 (Reset qualifs when a storage of a local ends)
- #90198 (Add caveat about changing parallelism and function call overhead)
Matthias Krüger [Sat, 23 Oct 2021 12:58:42 +0000 (14:58 +0200)]
Rollup merge of #90168 - tmiasko:const-qualif-storage, r=matthewjasper
Reset qualifs when a storage of a local ends
Reset qualifs when a storage of a local ends to ensure that the local qualifs
are affected by the state from previous loop iterations only if the local is
kept alive.
The change should be forward compatible with a stricter handling of indirect
assignments, since storage dead invalidates all existing pointers to the local.
Matthias Krüger [Sat, 23 Oct 2021 12:58:41 +0000 (14:58 +0200)]
Rollup merge of #89829 - voidc:assoc-const-variance, r=lcnr
Consider types appearing in const expressions to be invariant
This is an approach to fix #80977.
Currently, a type parameter which is only used in a constant expression is considered bivariant and will trigger error E0392 *"parameter T is never used"*.
Here is a short example:
```rust
pub trait Foo {
const N: usize;
}
struct Bar<T: Foo>([u8; T::N])
where [(); T::N]:;
```
([playgound](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2015&gist=b51a272853f75925e72efc1597478aa5))
While it is possible to silence this error by adding a `PhantomData<T>` field, I think the better solution would be to make `T` invariant.
This would be analogous to the invariance constraints added for associated types.
However, I'm quite new to the compiler and unsure whether this is the right approach.
Matthias Krüger [Sat, 23 Oct 2021 12:58:40 +0000 (14:58 +0200)]
Rollup merge of #88041 - Aaron1011:deny-proc-macro-hack, r=wesleywiser
Make all proc-macro back-compat lints deny-by-default
The affected crates have had plenty of time to update.
By keeping these as lints rather than making them hard errors,
we ensure that downstream crates will still be able to compile,
even if they transitive depend on broken versions of the affected
crates.
This should hopefully discourage anyone from writing any
new code which relies on the backwards-compatibility behavior.
bors [Sat, 23 Oct 2021 12:51:15 +0000 (12:51 +0000)]
Auto merge of #90104 - spastorino:coherence-for-negative-trait, r=nikomatsakis
Implement coherence checks for negative trait impls
The main purpose of this PR is to be able to [move Error trait to core](https://github.com/rust-lang/project-error-handling/issues/3).
This feature is necessary to handle the following from impl on box.
```rust
impl From<&str> for Box<dyn Error> { ... }
```
Without having negative traits affect coherence moving the error trait into `core` and moving that `From` impl to `alloc` will cause the from impl to no longer compiler because of a potential future incompatibility. The compiler indicates that `&str` _could_ introduce an `Error` impl in the future, and thus prevents the `From` impl in `alloc` that would cause overlap with `From<E: Error> for Box<dyn Error>`. Adding `impl !Error for &str {}` with the negative trait coherence feature will disable this error by encoding a stability guarantee that `&str` will never implement `Error`, making the `From` impl compile.
We would have this in `alloc`:
```rust
impl From<&str> for Box<dyn Error> {} // A
impl<E> From<E> for Box<dyn Error> where E: Error {} // B
```
and this in `core`:
```rust
trait Error {}
impl !Error for &str {}
```
r? `@nikomatsakis`
This PR was built on top of `@yaahc` PR #85764.
Language team proposal: to https://github.com/rust-lang/lang-team/issues/96
projects / rust.git / log