Jakob Degen [Thu, 11 Nov 2021 23:28:19 +0000 (18:28 -0500)]
Fix handling of substitutions and binders when deciding whether to suggest references
When suggesting references, substitutions were being forgotten and some types were misused. This led to at
least one ICE and other incorrectly emitted diagnostics. This has been fixed; in some cases this leads to
diagnostics changing, and tests have been adjusted.
bors [Sat, 13 Nov 2021 17:10:15 +0000 (17:10 +0000)]
Auto merge of #89551 - jhpratt:stabilize-const_raw_ptr_deref, r=oli-obk
Stabilize `const_raw_ptr_deref` for `*const T`
This stabilizes dereferencing immutable raw pointers in const contexts.
It does not stabilize `*mut T` dereferencing. This is behind the
same feature gate as mutable references.
Since it is unstable, doc-hidden and has no associated tracking issue it was never meant for public use. And since
it is no longer used outside alloc itself it can be made private again.
Also remove some functions that are dead due to lack of internal users.
Joshua Nelson [Mon, 8 Nov 2021 04:37:28 +0000 (04:37 +0000)]
Change paths for `dist` command to match the components they generate
Before, you could have the confusing situation where the command to
generate a component had no relation to the name of that component (e.g.
the `rustc` component was generated with `src/librustc`). This changes
the name to make them match up.
bors [Sat, 13 Nov 2021 08:22:52 +0000 (08:22 +0000)]
Auto merge of #87264 - mystor:expand_literal, r=petrochenkov
proc_macro: Add an expand_expr method to TokenStream
This feature is aimed at giving proc macros access to powers similar to those used by builtin macros such as `format_args!` or `concat!`. These macros are able to accept macros in place of string literal parameters, such as the format string, as they perform recursive macro expansion while being expanded.
This can be especially useful in many cases thanks to helper macros like `concat!`, `stringify!` and `include_str!` which are often used to construct string literals at compile-time in user code.
For now, this method only allows expanding macros which produce literals, although more expressions will be supported before the method is stabilized.
In earlier versions of this PR, this method exclusively returned `Literal`, and spans on returned literals were stripped of expansion context before being returned to be as conservative as possible about permission leakage. The method's naming has been generalized to eventually support arbitrary expressions, and the context stripping has been removed (https://github.com/rust-lang/rust/pull/87264#discussion_r674863279), which should allow for more general APIs like "format_args_implicits" (https://github.com/rust-lang/rust/issues/67984) to be supported as well.
bors [Sat, 13 Nov 2021 05:19:39 +0000 (05:19 +0000)]
Auto merge of #90041 - jfrimmel:rt_copy_checks, r=Mark-Simulacrum
Re-enable `copy[_nonoverlapping]()` debug-checks
This commit re-enables the debug checks for valid usages of the two functions `copy()` and `copy_nonoverlapping()`. Those checks were commented out in #79684 in order to make the functions const. All that's been left was a FIXME, that could not be resolved until there is was way to only do the checks at runtime.
Since #89247 there is such a way: `const_eval_select()`. This commit uses that new intrinsic in order to either do nothing (at compile time) or to do the old checks (at runtime).
The change itself is rather small: in order to make the checks usable with `const_eval_select`, they are moved into a local function (one for `copy` and one for `copy_nonoverlapping` to keep symmetry).
The change does not break referential transparency, as there is nothing you can do at compile time, which you cannot do on runtime without getting undefined behavior. The CTFE-engine won't allow missuses. The other way round is also fine.
I've refactored the code to use `#[cfg(debug_assertions)]` on the new items. If that is not desired, the second commit can be dropped.
I haven't added any checks, as I currently don't know, how to test this properly.
Closes #90012.
cc `@rust-lang/lang,` `@rust-lang/libs` and `@rust-lang/wg-const-eval` (as those teams are linked in the issue above).
bors [Sat, 13 Nov 2021 02:17:20 +0000 (02:17 +0000)]
Auto merge of #89167 - workingjubilee:use-simd, r=MarkSimulacrum
pub use core::simd;
A portable abstraction over SIMD has been a major pursuit in recent years for several programming languages. In Rust, `std::arch` offers explicit SIMD acceleration via compiler intrinsics, but it does so at the cost of having to individually maintain each and every single such API, and is almost completely `unsafe` to use. `core::simd` offers safe abstractions that are resolved to the appropriate SIMD instructions by LLVM during compilation, including scalar instructions if that is all that is available.
`core::simd` is enabled by the `#![portable_simd]` nightly feature tracked in https://github.com/rust-lang/rust/issues/86656 and is introduced here by pulling in the https://github.com/rust-lang/portable-simd repository as a subtree. We built the repository out-of-tree to allow faster compilation and a stochastic test suite backed by the proptest crate to verify that different targets, features, and optimizations produce the same result, so that using this library does not introduce any surprises. As these tests are technically non-deterministic, and thus can introduce overly interesting Heisenbugs if included in the rustc CI, they are visible in the commit history of the subtree but do nothing here. Some tests **are** introduced via the documentation, but these use deterministic asserts.
There are multiple unsolved problems with the library at the current moment, including a want for better documentation, technical issues with LLVM scalarizing and lowering to libm, room for improvement for the APIs, and so far I have not added the necessary plumbing for allowing the more experimental or libm-dependent APIs to be used. However, I thought it would be prudent to open this for review in its current condition, as it is both usable and it is likely I am going to learn something else needs to be fixed when bors tries this out.
The major types are
- `core::simd::Simd<T, N>`
- `core::simd::Mask<T, N>`
There is also the `LaneCount` struct, which, together with the SimdElement and SupportedLaneCount traits, limit the implementation's maximum support to vectors we know will actually compile and provide supporting logic for bitmasks. I'm hoping to simplify at least some of these out of the way as the compiler and library evolve.
Wesley Wiser [Tue, 9 Nov 2021 17:28:55 +0000 (12:28 -0500)]
Build musl dist artifacts with debuginfo enabled
Since our musl targets link to a version of musl we build and bundle
with the targets, if users need to debug into musl or generate
backtraces which contain parts of the musl library, they will be unable
to do so unless we enable and ship the debug info.
This patch changes our dist builds so they enabled debug info when
building musl. This patch also includes a fix for CFI detection in
musl's `configure` script which has been posted upstream[1].
The net effect of this is that we now ship debug info for musl in those
targets. This adds ~90kb to those artifacts but running `strip` on
binaries produced removes all of that. For a "hello world" Rust binary
on x86_64, the numbers are:
Scott McMurray [Sat, 13 Nov 2021 01:00:47 +0000 (17:00 -0800)]
Remove bigint_helper_methods for *signed* types
These are working well for *unsigned* types, for the the signed ones there are a bunch of questions about what the semantics and API should be. And for the main "helpers for big integer implementations" use, there's no need for the signed versions anyway.
And there are plenty of other methods which exist for unsigned types but not signed ones, like `next_power_of_two`, so this isn't unusual.
Jubilee Young [Fri, 22 Oct 2021 07:47:12 +0000 (00:47 -0700)]
Test core::simd works
These tests just verify some basic APIs of core::simd function, and
guarantees that attempting to access the wrong things doesn't work.
The majority of tests are stochastic, and so remain upstream, but
a few deterministic tests arrive in the subtree as doc tests.
Jubilee Young [Fri, 22 Oct 2021 07:12:00 +0000 (00:12 -0700)]
Expose portable-simd as core::simd
This enables programmers to use a safe alternative to the current
`extern "platform-intrinsics"` API for writing portable SIMD code.
This is `#![feature(portable_simd)]` as tracked in #86656
proc_macro: Add an expand_expr method to TokenStream
This feature is aimed at giving proc macros access to powers similar to
those used by builtin macros such as `format_args!` or `concat!`. These
macros are able to accept macros in place of string literal parameters,
such as the format string, as they perform recursive macro expansion
while being expanded.
This can be especially useful in many cases thanks to helper macros like
`concat!`, `stringify!` and `include_str!` which are often used to
construct string literals at compile-time in user code.
For now, this method only allows expanding macros which produce
literals, although more expresisons will be supported before the method
is stabilized.
bors [Fri, 12 Nov 2021 19:28:04 +0000 (19:28 +0000)]
Auto merge of #90836 - matthiaskrgr:rollup-ou6yrlw, r=matthiaskrgr
Rollup of 7 pull requests
Successful merges:
- #90589 (rustc_llvm: update PassWrapper for recent LLVM)
- #90644 (Extend the const swap feature)
- #90704 (Unix ExitStatus comments and a tiny docs fix)
- #90761 (Shorten Span of unused macro lints)
- #90795 (Add more comments to explain the code to generate the search index)
- #90798 (Document `unreachable!` custom panic message)
- #90826 (rustc_feature: Convert `BuiltinAttribute` from tuple to a struct)
Matthias Krüger [Fri, 12 Nov 2021 18:17:33 +0000 (19:17 +0100)]
Rollup merge of #90798 - edmorley:doc-unreachable-custom-message, r=dtolnay
Document `unreachable!` custom panic message
The `unreachable!` docs previously did not mention that there was a second form, `unreachable!("message")` that could be used to specify a custom panic message,
The docs now mention this feature in the same wording as currently used for `unimplemented!`:
https://doc.rust-lang.org/core/macro.unimplemented.html#panics
Matthias Krüger [Fri, 12 Nov 2021 18:17:32 +0000 (19:17 +0100)]
Rollup merge of #90795 - GuillaumeGomez:more-search-index-comments, r=notriddle
Add more comments to explain the code to generate the search index
Fixes #90766.
I tried to put comments when the code wasn't easy to understand at first sight and added more documentation on the recursive function. Please tell me if I misused the terminology or if comments can be improved or added into other places.
Guillaume Gomez [Fri, 12 Nov 2021 14:25:13 +0000 (15:25 +0100)]
Remove unneeded FIXME: after testing the suggested changes, we reached the conclusion that the code readibility wasn't worth the almost unnoticeable perf improvement
Scott McMurray [Fri, 12 Nov 2021 04:32:18 +0000 (20:32 -0800)]
MIRI says `reverse` is UB, so replace it with an implementation that LLVM can vectorize
For small types with padding, the current implementation is UB because it does integer operations on uninit values. But LLVM has gotten smarter since I wrote the previous implementation in 2017, so remove all the manual magic and just write it in such a way that LLVM will vectorize. This code is much simpler (albeit nuanced) and has very little `unsafe`, and is actually faster to boot!
bors [Thu, 11 Nov 2021 22:00:53 +0000 (22:00 +0000)]
Auto merge of #90489 - jyn514:load-all-extern-crates, r=petrochenkov
rustdoc: Go back to loading all external crates unconditionally
This *continues* to cause regressions. This code will be unnecessary
once access to the resolver happens fully before creating the tyctxt
(#83761), so load all crates unconditionally for now. To minimize churn, this leaves in the code for loading crates selectively.
Ian Jackson [Mon, 8 Nov 2021 17:28:02 +0000 (17:28 +0000)]
unix::ExitStatusExt: Correct reference to _exit system call
As discussed here
https://github.com/rust-lang/rust/pull/88300#issuecomment-936085371
exit is (conventionally) a library function, with _exit being the
actual system call.
I have checked the other references and they say "if the process
terminated by calling `exti`". I think despite the slight
imprecision (strictly, it should read iff ... `_exit`), this is
clearer. Anyone who knows about the distinction between `exit` and
`_exit` will not be confused.
`_exit` is the correct traditional name for the system call, despite
Linux calling it `exit_group` or `exit`:
https://www.freebsd.org/cgi/man.cgi?query=_exit&sektion=2&n=1
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
Ed Morley [Thu, 11 Nov 2021 13:41:21 +0000 (13:41 +0000)]
Document `unreachable!()` custom panic message
The `unreachable!` docs previously did not mention that there was a second
form, `unreachable!("message")` that could be used to specify a custom panic
message,
The docs now mention this in the same style as currently used for `unimplemented!`:
https://doc.rust-lang.org/core/macro.unimplemented.html#panics
bors [Thu, 11 Nov 2021 12:07:53 +0000 (12:07 +0000)]
Auto merge of #88798 - sunfishcode:sunfishcode/windows-null-handles, r=joshtriplett
Fix assertion failures in `OwnedHandle` with `windows_subsystem`.
As discussed in #88576, raw handle values in Windows can be null, such
as in `windows_subsystem` mode, or when consoles are detached from a
process. So, don't use `NonNull` to hold them, don't assert that they're
not null, and remove `OwnedHandle`'s `repr(transparent)`. Introduce a
new `HandleOrNull` type, similar to `HandleOrInvalid`, to cover the FFI
use case.
bors [Thu, 11 Nov 2021 09:13:22 +0000 (09:13 +0000)]
Auto merge of #90755 - scottmcm:spec-array-clone, r=jackh726
Specialize array cloning for Copy types
Because after PR 86041, the optimizer no longer load-merges at the LLVM IR level, which might be part of the perf loss. (I'll run perf and see if this makes a difference.)
Also I added a codegen test so this hopefully won't regress in future -- it passes on stable and with my change here, but not on the 2021-11-09 nightly.
Example on current nightly: <https://play.rust-lang.org/?version=nightly&mode=release&edition=2021&gist=1f52d46fb8fc3ca3ac9f097390085ffa>
```rust
type T = u8;
const N: usize = 3;
bors [Thu, 11 Nov 2021 02:52:32 +0000 (02:52 +0000)]
Auto merge of #83846 - torhovland:issue-10971, r=davidtwco
Added the --temps-dir option
Fixes #10971.
The new `--temps-dir` option puts intermediate files in a user-specified directory. This provides a fix for the issue where parallel invocations of rustc would overwrite each other's intermediate files.
No files are kept in the intermediate directory unless `-C save-temps=yes`.
If additional files are specifically requested using `--emit asm,llvm-bc,llvm-ir,obj,metadata,link,dep-info,mir`, these will be put in the output directory rather than the intermediate directory.
This is a backward-compatible change, i.e. if `--temps-dir` is not specified, the behavior is the same as before.
Jubilee Young [Wed, 10 Nov 2021 07:49:16 +0000 (23:49 -0800)]
Dynamically detect AVX512 in CI
We would like to check for errors with AVX512,
but we don't pick our CPU. So, detect available features.
This variance in checks stochastically reveals issues.
Nondeterminism is acceptable as our goal is protecting downstream.
Matthias Krüger [Wed, 10 Nov 2021 22:04:26 +0000 (23:04 +0100)]
Rollup merge of #90736 - Lokathor:inline-asm-docs-updates, r=Amanieu
adjust documented inline-asm register constraints
This change more clearly specifies how `reg` and `reg_thumb` work with ARM, Thumb2, and Thumb1 code.
Based upon the [llvm documentation](https://llvm.org/docs/LangRef.html#supported-constraint-code-list) for register constraint codes.
To be clear, this just updates the docs to match what already happens with rustc/llvm.
No change in the compiler is required to make it match this new documentation.
Matthias Krüger [Wed, 10 Nov 2021 22:04:25 +0000 (23:04 +0100)]
Rollup merge of #89930 - cuviper:avoid-clone3, r=joshtriplett
Only use `clone3` when needed for pidfd
In #89522 we learned that `clone3` is interacting poorly with Gentoo's
`sandbox` tool. We only need that for the unstable pidfd extensions, so
otherwise avoid that and use a normal `fork`.
This is a re-application of beta #89924, now that we're aware that we need
more than just a temporary release fix. I also reverted 12fbabd27f700, as
that was just fallout from using `clone3` instead of `fork`.
Matthias Krüger [Wed, 10 Nov 2021 17:52:28 +0000 (18:52 +0100)]
Rollup merge of #90727 - GuillaumeGomez:remove-potential-useless-search-index-data, r=notriddle,camelid
Remove potential useless data for search index
I uncovered this case when working on https://github.com/rust-lang/rust/pull/90726 to debug https://github.com/rust-lang/rust/pull/90385.
Explanations: if we have a full generic, we check if it has generics then we do the following:
* If it has only one generic, we remove one nested level in order to not keep the "parent" generic (since it has empty name, it's useless after all).
* Otherwise we add it alongside its generics.
However, I didn't handle the case where a generic had no generics. Meaning that we were adding items with empty names in the search index. So basically useless data in the search index.
Matthias Krüger [Wed, 10 Nov 2021 17:52:26 +0000 (18:52 +0100)]
Rollup merge of #88447 - inquisitivecrystal:rustdoc-vis, r=jyn514
Use computed visibility in rustdoc
This PR changes `librustdoc` to use computed visibility instead of syntactic visibility. It was initially part of #88019, but was separated due to concerns that it might cause a regression somewhere we couldn't predict.
Alex Crichton [Mon, 1 Nov 2021 20:44:28 +0000 (13:44 -0700)]
Update more rustc/libtest things for wasm64
* Add wasm64 variants for inline assembly along the same lines as wasm32
* Update a few directives in libtest to check for `target_family`
instead of `target_arch`
* Update some rustc codegen and typechecks specialized for wasm32 to
also work for wasm64.
Alex Crichton [Mon, 1 Nov 2021 21:16:25 +0000 (14:16 -0700)]
Fix a crash with wasm64 in LLVM
This commit works around a crash in LLVM when the
`-generate-arange-section` argument is passed to LLVM. An LLVM bug is
opened for this and the code in question is also set to continue passing
this flag with LLVM 14, assuming that this is fixed by the time LLVM 14
comes out. Otherwise this should work around debuginfo crashes on LLVM
13.
Alex Crichton [Thu, 28 Oct 2021 17:58:16 +0000 (10:58 -0700)]
std: Get the standard library compiling for wasm64
This commit goes through and updates various `#[cfg]` as appropriate to
get the wasm64-unknown-unknown target behaving similarly to the
wasm32-unknown-unknown target. Most of this is just updating various
conditions for `target_arch = "wasm32"` to also account for `target_arch
= "wasm64"` where appropriate. This commit also lists `wasm64` as an
allow-listed architecture to not have the `restricted_std` feature
enabled, enabling experimentation with `-Z build-std` externally.
The main goal of this commit is to enable playing around with
`wasm64-unknown-unknown` externally via `-Z build-std` in a way that's
similar to the `wasm32-unknown-unknown` target. These targets are
effectively the same and only differ in their pointer size, but wasm64
is much newer and has much less ecosystem/library support so it'll still
take time to get wasm64 fully-fledged.