Ralf Jung [Wed, 19 May 2021 22:18:56 +0000 (00:18 +0200)]
Rollup merge of #84717 - dtolnay:literalfromstr, r=petrochenkov
impl FromStr for proc_macro::Literal
Note that unlike `impl FromStr for proc_macro::TokenStream`, this impl does not permit whitespace or comments. The input string must consist of nothing but your literal.
bors [Wed, 19 May 2021 18:41:23 +0000 (18:41 +0000)]
Auto merge of #83842 - LeSeulArtichaut:thir-vec, r=nikomatsakis
Store THIR in `IndexVec`s instead of an `Arena`
This is a necessary step to store the THIR in a query: #85273. See [relevant discussion on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/278509-project-thir-unsafeck/topic/THIR-dependent.20queries.20design).
bors [Wed, 19 May 2021 15:59:46 +0000 (15:59 +0000)]
Auto merge of #84876 - alexcrichton:inline-thread-locals-cross-crate, r=Mark-Simulacrum
std: Attempt again to inline thread-local-init across crates
Issue #25088 has been part of `thread_local!` for quite some time now.
Historical attempts have been made to add `#[inline]` to `__getit`
in #43931, #50252, and #59720, but these attempts ended up not landing
at the time due to segfaults on Windows.
In the interim though with `const`-initialized thread locals AFAIK this
is the only remaining bug which is why you might want to use
`#[thread_local]` over `thread_local!`. As a result I figured it was
time to resubmit this and see how it fares on CI and if I can help
debugging any issues that crop up.
bors [Wed, 19 May 2021 10:11:28 +0000 (10:11 +0000)]
Auto merge of #85376 - RalfJung:ptrless-allocs, r=oli-obk
CTFE core engine allocation & memory API improvemenets
This is a first step towards https://github.com/rust-lang/miri/issues/841.
- make `Allocation` API offset-based (no more making up `Pointer`s just to access an `Allocation`)
- make `Memory` API higher-level (combine checking for access and getting access into one operation)
The Miri-side PR is at https://github.com/rust-lang/miri/pull/1804.
r? `@oli-obk`
bors [Wed, 19 May 2021 07:25:17 +0000 (07:25 +0000)]
Auto merge of #85276 - Bobo1239:more_dso_local, r=nagisa
Set dso_local for more items
Related to https://github.com/rust-lang/rust/pull/83592. (cc `@nagisa)`
Noticed that on x86_64 with `relocation-model: static` `R_X86_64_GOTPCREL` relocations were still generated in some cases. (related: https://github.com/Rust-for-Linux/linux/issues/135; Rust-for-Linux needs these fixes to successfully build)
First time doing anything with LLVM so not sure whether this is correct but the following are some of the things I've tried to convince myself.
## C equivalent
Example from clang which also sets `dso_local` in these cases:
`clang-12 -fno-PIC -S -emit-llvm test.c`
```C
extern int A;
pub fn a() -> &'static i32 {
&STATIC
}
pub fn b() -> &'static i32 {
unsafe {&EXT_STATIC}
}
```
`objdump test.o -r`
nightly-2021-02-20 (rustc target is `x86_64-linux-kernel`):
```
RELOCATION RECORDS FOR [.text._ZN4test1a17h1024ba65f3424175E]:
OFFSET TYPE VALUE 0000000000000007 R_X86_64_32S _ZN4test6STATIC17h3adc41a83746c9ffE
RELOCATION RECORDS FOR [.text._ZN4test1b17h86a6a80c1190ac8dE]:
OFFSET TYPE VALUE 0000000000000007 R_X86_64_32S EXT_STATIC
```
nightly-2021-05-10:
```
RELOCATION RECORDS FOR [.text._ZN4test1a17he846f03bf37b2d20E]:
OFFSET TYPE VALUE 0000000000000007 R_X86_64_GOTPCREL _ZN4test6STATIC17h5a059515bf3d4968E-0x0000000000000004
RELOCATION RECORDS FOR [.text._ZN4test1b17h7e0f7f80fbd91125E]:
OFFSET TYPE VALUE 0000000000000007 R_X86_64_GOTPCREL EXT_STATIC-0x0000000000000004
```
This PR:
```
RELOCATION RECORDS FOR [.text._ZN4test1a17he846f03bf37b2d20E]:
OFFSET TYPE VALUE 0000000000000007 R_X86_64_32S _ZN4test6STATIC17h5a059515bf3d4968E
RELOCATION RECORDS FOR [.text._ZN4test1b17h7e0f7f80fbd91125E]:
OFFSET TYPE VALUE 0000000000000007 R_X86_64_32S EXT_STATIC
```
Jack Huey [Wed, 19 May 2021 02:36:19 +0000 (22:36 -0400)]
Rollup merge of #85438 - GuillaumeGomez:fix-escape-handling, r=jsha
Fix escape handling
Currently, when we press Escape while on the search results, nothing is happening, this PR fixes it.
More information: it's because in case the element doesn't exist, `hasClass` will return `null`, which coerces into `false` with the `!` comparison operator. But even if it returned `false`, it would still be an issue because if the element doesn't exist, it means it's hidden so in this case it's just as good, hence the additional check I added.
Jack Huey [Wed, 19 May 2021 02:36:13 +0000 (22:36 -0400)]
Rollup merge of #85396 - jsha:top-doc-font-sizes, r=GuillaumeGomez
rustdoc: restore header sizes
The `<details>` toggle work changed the relationship from #main to the top-doc docblock so it was no longer a parent relationship but a great-grandparent relationship. This updates the CSS rules that set the heading sizes so they still apply.
Jack Huey [Wed, 19 May 2021 02:36:08 +0000 (22:36 -0400)]
Rollup merge of #85297 - infinity0:master, r=Mark-Simulacrum
bootstrap: build cargo only if requested in tools
In Debian we'd like to build rustfmt and clippy alongside rustc, but we're still excluding cargo from the rustc build and doing that separately. This patch makes that possible.
Jack Huey [Wed, 19 May 2021 02:36:04 +0000 (22:36 -0400)]
Rollup merge of #85274 - luqmana:linker-is-gnu-gc-sections, r=petrochenkov
Only pass --[no-]gc-sections if linker is GNU ld.
Fixes a regression from #84468 where linking now fails with solaris linkers. LinkerFlavor::Gcc does not always mean GNU ld specifically. And in the case of at least the solaris ld in illumos, that flag is unrecognized and will cause the linking step to fail.
Even though removing the `is_like_solaris` branch from `gc_sections` in #84468 made sense as `-z ignore/record` are more analogous to the `--[no-]-as-needed` flags, it inadvertently caused solaris linkers to be passed the `--gc-sections` flag. So let's just change it to be more explicit about when we pass those flags.
Jack Huey [Wed, 19 May 2021 02:35:59 +0000 (22:35 -0400)]
Rollup merge of #84883 - durin42:allow-unused-prefixes, r=nikic
compiletest: "fix" FileCheck with --allow-unused-prefixes
The default of --allow-unused-prefixes used to be false, but in LLVM
change 87dbdd2e3b (https://reviews.llvm.org/D95849) the default became
true. I'm not quite sure how we could do better here (specifically not
providing the CHECK prefix when it's not needed), but this seems to work
for now.
This reduces codegen test failures against LLVM HEAD from 31 cases to 5.
Jack Huey [Wed, 19 May 2021 02:35:54 +0000 (22:35 -0400)]
Rollup merge of #83366 - jyn514:stabilize-key-value-attrs, r=petrochenkov
Stabilize extended_key_value_attributes
Closes https://github.com/rust-lang/rust/issues/44732. Closes https://github.com/rust-lang/rust/issues/78835. Closes https://github.com/rust-lang/rust/issues/82768 (by making it irrelevant).
# Stabilization report
## Summary
This stabilizes using macro expansion in key-value attributes, like so:
#[path = concat!(env!("OUT_DIR"), "/generated.rs")]
mod m;
```
See Petrochenkov's excellent blog post [on internals](https://internals.rust-lang.org/t/macro-expansion-points-in-attributes/11455)
for alternatives that were considered and rejected ("why accept no more and no less?")
This has been available on nightly since 1.50 with no major issues.
## Notes
### Accepted syntax
The parser accepts arbitrary Rust expressions in this position, but any expression other than a macro invocation will ultimately lead to an error because it is not expected by the built-in expression forms (e.g., `#[doc]`). Note that decorators and the like may be able to observe other expression forms.
### Expansion ordering
Expansion of macro expressions in "inert" attributes occurs after decorators have executed, analogously to macro expressions appearing in the function body or other parts of decorator input.
There is currently no way for decorators to accept macros in key-value position if macro expansion must be performed before the decorator executes (if the macro can simply be copied into the output for later expansion, that can work).
- Initial proposal: https://github.com/rust-lang/rust/issues/55414#issuecomment-554005412
- Experiment to see how much code it would break: https://github.com/rust-lang/rust/pull/67121
- Preliminary work to restrict expansion that would conflict with this
feature: https://github.com/rust-lang/rust/pull/77271
- Initial implementation: https://github.com/rust-lang/rust/pull/78837
- Fix for an ICE: https://github.com/rust-lang/rust/pull/80563
## Unresolved Questions
~~https://github.com/rust-lang/rust/pull/83366#issuecomment-805180738 listed some concerns, but they have been resolved as of this final report.~~
## Additional Information
There are two workarounds that have a similar effect for `#[doc]`
attributes on nightly. One is to emulate this behavior by using a limited version of this feature that was stabilized for historical reasons:
forward_inner_docs!(include_str!("lib.rs") => struct S {});
```
This also works for other attributes (like `#[path = concat!(...)]`).
The other is to use `doc(include)`:
```rust
#![feature(external_doc)]
#[doc(include = "lib.rs")]
struct S {}
```
The first works, but is non-trivial for people to discover, and
difficult to read and maintain. The second is a strange special-case for
a particular use of the macro. This generalizes it to work for any use
case, not just including files.
I plan to remove `doc(include)` when this is stabilized
(https://github.com/rust-lang/rust/pull/82539). The `forward_inner_docs`
workaround will still compile without warnings, but I expect it to be
used less once it's no longer necessary.
bors [Tue, 18 May 2021 20:50:01 +0000 (20:50 +0000)]
Auto merge of #84767 - scottmcm:try_trait_actual, r=lcnr
Implement the new desugaring from `try_trait_v2`
~~Currently blocked on https://github.com/rust-lang/rust/issues/84782, which has a PR in https://github.com/rust-lang/rust/pull/84811~~ Rebased atop that fix.
Unfortunately this is already touching a ton of things, so if you have suggestions for good ways to split it up, I'd be happy to hear them. (The combination between the use in the library, the compiler changes, the corresponding diagnostic differences, even MIR tests mean that I don't really have a great plan for it other than trying to have decently-readable commits.
r? `@ghost`
~~(This probably shouldn't go in during the last week before the fork anyway.)~~ Fork happened.
Alex Crichton [Mon, 3 May 2021 18:39:10 +0000 (11:39 -0700)]
std: Attempt again to inline thread-local-init across crates
Issue #25088 has been part of `thread_local!` for quite some time now.
Historical attempts have been made to add `#[inline]` to `__getit`
in #43931, #50252, and #59720, but these attempts ended up not landing
at the time due to segfaults on Windows.
In the interim though with `const`-initialized thread locals AFAIK this
is the only remaining bug which is why you might want to use
`#[thread_local]` over `thread_local!`. As a result I figured it was
time to resubmit this and see how it fares on CI and if I can help
debugging any issues that crop up.
bors [Tue, 18 May 2021 18:04:47 +0000 (18:04 +0000)]
Auto merge of #85443 - RalfJung:rollup-d9gd64t, r=RalfJung
Rollup of 7 pull requests
Successful merges:
- #84462 (rustdoc: use focus for search navigation)
- #85251 (Make `const_generics_defaults` not an incomplete feature)
- #85404 (Backport 1.52.1 release notes)
- #85407 (Improve display for "copy-path" button, making it more discreet)
- #85423 (Don't require cmake on Windows when LLVM isn't being built)
- #85428 (Add x.py pre-setup instructions)
- #85442 (fix typo)
Ralf Jung [Tue, 18 May 2021 17:35:47 +0000 (19:35 +0200)]
Rollup merge of #85428 - leebradley:add-xpy-presetup-instructions, r=Mark-Simulacrum
Add x.py pre-setup instructions
This change adds pre-setup instructions that outline how x.py requires
python to be setup and how to work around the problem of x.py failing to
locate python, especially now that Ubuntu 20.04's dropped default python
command is causing people to encounter this issue regularly.
Ralf Jung [Tue, 18 May 2021 17:35:35 +0000 (19:35 +0200)]
Rollup merge of #84462 - jsha:focus-search-results2, r=GuillaumeGomez
rustdoc: use focus for search navigation
Rather than keeping track of highlighted element inside the JS, take advantage of `.focus()` and the :focus CSS pseudo-class.
This required wrapping each row of results in one big `<a>` tag (because anchors can be focused, but table rows cannot). That in turn required moving from a table layout to a div layout with float.
This makes it so Ctrl+Enter opens links in new tabs, and using the arrow keys to navigate off the bottom of the page scrolls the rest of the page into view. It also simplifies the keyboard event handling. It eliminates the need for click handlers on the search results, and for tracking mouse movements.
This changes the UI treatment of mouse hovering. A hovered element now gets a light grey background, but does not change the focus. It's possible to have two highlighted search results: one that is focused (via keyboard) and one that is hovered (via mouse). Pressing enter will activate the focused link; clicking will activate the hovered link. This matches up with how Firefox and Chrome handle suggestions in their URL bar, and avoids stray mouse movements changing the focus.
Selecting tabs is now done with left/right arrows while any search result is focused. The visibility of results on each search tab is
controlled with the "active" class, rather than by setting display: none directly. Note that the old code kept track of highlighted search element when tabbing back and forth. The new code doesn't.
Demo at https://hoffman-andrews.com/rust/focus-search-results2/std/?search=fn
Ralf Jung [Sun, 16 May 2021 16:53:20 +0000 (18:53 +0200)]
CTFE core engine allocation & memory API improvemenets
- make Allocation API offset-based (no more Pointer)
- make Memory API higher-level (combine checking for access and getting access into one operation)
bors [Tue, 18 May 2021 14:48:53 +0000 (14:48 +0000)]
Auto merge of #85437 - GuillaumeGomez:rollup-3jcirty, r=GuillaumeGomez
Rollup of 7 pull requests
Successful merges:
- #84587 (rustdoc: Make "rust code block is empty" and "could not parse code block" warnings a lint (`INVALID_RUST_CODEBLOCKS`))
- #85280 (Toggle-wrap items differently than top-doc.)
- #85338 (Implement more Iterator methods on core::iter::Repeat)
- #85339 (Report an error if a lang item has the wrong number of generic arguments)
- #85369 (Suggest borrowing if a trait implementation is found for &/&mut <type>)
- #85393 (Suppress spurious errors inside `async fn`)
- #85415 (Clean up remnants of BorrowOfPackedField)
Guillaume Gomez [Tue, 18 May 2021 12:08:55 +0000 (14:08 +0200)]
Rollup merge of #85369 - FabianWolff:issue-84973, r=jackh726
Suggest borrowing if a trait implementation is found for &/&mut <type>
This pull request fixes #84973 by suggesting to borrow if a trait is not implemented for some type `T`, but it is for `&T` or `&mut T`. For instance:
```rust
trait Ti {}
impl<T> Ti for &T {}
fn foo<T: Ti>(_: T) {}
trait Tm {}
impl<T> Tm for &mut T {}
fn bar<T: Tm>(_: T) {}
fn main() {
let a: i32 = 5;
foo(a);
let b: Box<i32> = Box::new(42);
bar(b);
}
```
gives, on current nightly:
```
error[E0277]: the trait bound `i32: Ti` is not satisfied
--> t2.rs:11:9
|
3 | fn foo<T: Ti>(_: T) {}
| -- required by this bound in `foo`
...
11 | foo(a);
| ^ the trait `Ti` is not implemented for `i32`
error[E0277]: the trait bound `Box<i32>: Tm` is not satisfied
--> t2.rs:14:9
|
7 | fn bar<T: Tm>(_: T) {}
| -- required by this bound in `bar`
...
14 | bar(b);
| ^ the trait `Tm` is not implemented for `Box<i32>`
error: aborting due to 2 previous errors
```
whereas with my changes, I get:
```
error[E0277]: the trait bound `i32: Ti` is not satisfied
--> t2.rs:11:9
|
3 | fn foo<T: Ti>(_: T) {}
| -- required by this bound in `foo`
...
11 | foo(a);
| ^
| |
| expected an implementor of trait `Ti`
| help: consider borrowing here: `&a`
error[E0277]: the trait bound `Box<i32>: Tm` is not satisfied
--> t2.rs:14:9
|
7 | fn bar<T: Tm>(_: T) {}
| -- required by this bound in `bar`
...
14 | bar(b);
| ^
| |
| expected an implementor of trait `Tm`
| help: consider borrowing mutably here: `&mut b`
error: aborting due to 2 previous errors
```
In my implementation, I have added a "blacklist" to make these suggestions flexible. In particular, suggesting to borrow can interfere with other suggestions, such as to add another trait bound to a generic argument. I have tried to configure this blacklist to cause the least amount of test case failures, i.e. to model the current behavior as closely as possible (I only had to change one existing test case, and this change was quite clearly an improvement).
Guillaume Gomez [Tue, 18 May 2021 12:08:51 +0000 (14:08 +0200)]
Rollup merge of #85339 - FabianWolff:issue-83893, r=varkor
Report an error if a lang item has the wrong number of generic arguments
This pull request fixes #83893. The issue is that the lang item code currently checks whether the lang item has the correct item kind (e.g. a `#[lang="add"]` has to be a trait), but not whether the item has the correct number of generic arguments.
This can lead to an "index out of bounds" ICE when the compiler tries to create more substitutions than there are suitable types available (if the lang item was declared with too many generic arguments).
For instance, here is a reduced ("reduced" in the sense that it does not trigger additional errors) version of the example given in #83893:
```rust
#![feature(lang_items,no_core)]
#![no_core]
#![crate_type="lib"]
#[lang = "sized"]
trait MySized {}
#[lang = "add"]
trait MyAdd<'a, T> {}
fn ice() {
let r = 5;
let a = 6;
r + a
}
```
On current nightly, this immediately causes an ICE without any warnings or errors emitted. With the changes in this PR, however, I get no ICE and two errors:
```
error[E0718]: `add` language item must be applied to a trait with 1 generic argument
--> pr-ex.rs:8:1
|
8 | #[lang = "add"]
| ^^^^^^^^^^^^^^^
9 | trait MyAdd<'a, T> {}
| ------- this trait has 2 generic arguments, not 1
error[E0369]: cannot add `{integer}` to `{integer}`
--> pr-ex.rs:14:7
|
14 | r + a
| - ^ - {integer}
| |
| {integer}
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0369, E0718.
For more information about an error, try `rustc --explain E0369`.
```
Guillaume Gomez [Tue, 18 May 2021 12:08:46 +0000 (14:08 +0200)]
Rollup merge of #85338 - lopopolo:core-iter-repeat-gh-81292, r=joshtriplett
Implement more Iterator methods on core::iter::Repeat
`core::iter::Repeat` always returns the same element, which means we can
do better than implementing most `Iterator` methods in terms of
`Iterator::next`.
Fixes #81292.
#81292 raises the question of whether these changes violate the contract of `core::iter::Repeat`, but as far as I can tell `core::iter::repeat` doesn't make any guarantees around how it calls `Clone::clone`.
Guillaume Gomez [Tue, 18 May 2021 12:08:42 +0000 (14:08 +0200)]
Rollup merge of #85280 - jsha:move-trait-toggles, r=GuillaumeGomez
Toggle-wrap items differently than top-doc.
This makes sure things like trait methods get wrapped at the
`<h3><code>` level rather than at the `.docblock` level. Also it ensures
that only the actual top documentation gets the `.top-doc` class.
Guillaume Gomez [Tue, 18 May 2021 12:08:41 +0000 (14:08 +0200)]
Rollup merge of #84587 - jyn514:rustdoc-lint-block, r=CraftSpider
rustdoc: Make "rust code block is empty" and "could not parse code block" warnings a lint (`INVALID_RUST_CODEBLOCKS`)
Fixes https://github.com/rust-lang/rust/issues/79792. This already went through FCP in https://github.com/rust-lang/rust/pull/79816, so it only needs final review.
This is mostly a rebase of https://github.com/rust-lang/rust/pull/79816 - thank you ``@poliorcetics`` for doing most of the work!
bors [Tue, 18 May 2021 08:01:32 +0000 (08:01 +0000)]
Auto merge of #82973 - ijackson:exitstatuserror, r=yaahc
Provide ExitStatusError
Closes #73125
In MR #81452 "Add #[must_use] to [...] process::ExitStatus" we concluded that the existing arrangements in are too awkward so adding that `#[must_use]` is blocked on improving the ergonomics.
I wrote a mini-RFC-style discusion of the approach in https://github.com/rust-lang/rust/issues/73125#issuecomment-771092741
Lee Bradley [Tue, 18 May 2021 05:33:17 +0000 (00:33 -0500)]
Add x.py pre-setup instructions
This change adds pre-setup instructions that outline how x.py requires
python to be setup and how to work around the problem of x.py failing to
locate python, especially now that Ubuntu 20.04's dropped default python
command is causing people to encounter this issue regularly.
#[path = concat!(env!("OUT_DIR"), "/generated.rs")]
mod m;
```
See the changes to the reference for details on what macros are allowed;
see Petrochenkov's excellent blog post [on internals](https://internals.rust-lang.org/t/macro-expansion-points-in-attributes/11455)
for alternatives that were considered and rejected ("why accept no more
and no less?")
This has been available on nightly since 1.50 with no major issues.
## Notes
### Accepted syntax
The parser accepts arbitrary Rust expressions in this position, but any expression other than a macro invocation will ultimately lead to an error because it is not expected by the built-in expression forms (e.g., `#[doc]`). Note that decorators and the like may be able to observe other expression forms.
### Expansion ordering
Expansion of macro expressions in "inert" attributes occurs after decorators have executed, analogously to macro expressions appearing in the function body or other parts of decorator input.
There is currently no way for decorators to accept macros in key-value position if macro expansion must be performed before the decorator executes (if the macro can simply be copied into the output for later expansion, that can work).
- Initial proposal: https://github.com/rust-lang/rust/issues/55414#issuecomment-554005412
- Experiment to see how much code it would break: https://github.com/rust-lang/rust/pull/67121
- Preliminary work to restrict expansion that would conflict with this
feature: https://github.com/rust-lang/rust/pull/77271
- Initial implementation: https://github.com/rust-lang/rust/pull/78837
- Fix for an ICE: https://github.com/rust-lang/rust/pull/80563
## Unresolved Questions
~~https://github.com/rust-lang/rust/pull/83366#issuecomment-805180738 listed some concerns, but they have been resolved as of this final report.~~
## Additional Information
There are two workarounds that have a similar effect for `#[doc]`
attributes on nightly. One is to emulate this behavior by using a limited version of this feature that was stabilized for historical reasons:
forward_inner_docs!(include_str!("lib.rs") => struct S {});
```
This also works for other attributes (like `#[path = concat!(...)]`).
The other is to use `doc(include)`:
```rust
#![feature(external_doc)]
#[doc(include = "lib.rs")]
struct S {}
```
The first works, but is non-trivial for people to discover, and
difficult to read and maintain. The second is a strange special-case for
a particular use of the macro. This generalizes it to work for any use
case, not just including files.
I plan to remove `doc(include)` when this is stabilized. The
`forward_inner_docs` workaround will still compile without warnings, but
I expect it to be used less once it's no longer necessary.
Alexis Bourget [Mon, 28 Dec 2020 22:07:20 +0000 (23:07 +0100)]
New rustdoc lint to respect -Dwarnings correctly
This adds a new lint to `rustc` that is used in rustdoc when a code
block is empty or cannot be parsed as valid Rust code.
Previously this was unconditionally a warning. As such some
documentation comments were (unknowingly) abusing this to pass despite
the `-Dwarnings` used when compiling `rustc`, this should not be the
case anymore.
bors [Mon, 17 May 2021 19:15:21 +0000 (19:15 +0000)]
Auto merge of #85414 - RalfJung:rollup-ueqcik4, r=RalfJung
Rollup of 8 pull requests
Successful merges:
- #85087 (`eval_fn_call`: check the ABI of `body.source`)
- #85302 (Expand WASI abbreviation in docs)
- #85355 (More tests for issue-85255)
- #85367 (Fix invalid input:disabled CSS selector)
- #85374 (mark internal inplace_iteration traits as hidden)
- #85408 (remove size field from Allocation)
- #85409 (Simplify `cfg(any(unix, target_os="redox"))` in example to just `cfg(unix)`)
- #85412 (remove some functions that were only used by Miri)
Ralf Jung [Mon, 17 May 2021 16:52:13 +0000 (18:52 +0200)]
Rollup merge of #85409 - CDirkx:cfg_redox, r=nagisa
Simplify `cfg(any(unix, target_os="redox"))` in example to just `cfg(unix)`
Update example for `OsString` that handled `redox` seperately from `unix`: Redox has been completely integrated under `target_family="unix"`, so `cfg(unix)` implies `target_os="redox"`
Ralf Jung [Mon, 17 May 2021 16:52:04 +0000 (18:52 +0200)]
Rollup merge of #85302 - r00ster91:patch-7, r=joshtriplett
Expand WASI abbreviation in docs
I was pretty sure this was related to something for WebAssembly but wasn't 100% sure so I checked but even on these top-level docs I couldn't find the abbreviation expanded. I'm normally used to Rust docs being detailed and explanatory and writing abbreviations like this out in full at least once so I thought it was worth the change. Feel free to close this if it's too much.
Ralf Jung [Mon, 17 May 2021 16:51:59 +0000 (18:51 +0200)]
Rollup merge of #85087 - hyd-dev:lots-of-abis, r=RalfJung
`eval_fn_call`: check the ABI of `body.source`
And stop checking `instance_ty.fn_sig(*self.tcx).abi()`, if the function is not an intrinsic.
Addresses https://github.com/rust-lang/miri/pull/1776#discussion_r615381169.
No idea how to test this without Miri...
bors [Mon, 17 May 2021 16:34:11 +0000 (16:34 +0000)]
Auto merge of #85352 - Xanewok:update-rls, r=Xanewok
Update RLS
Contains https://github.com/rust-lang/rls/pull/1736. With #82208 merged, this should now close https://github.com/rust-lang/rust/issues/85225. Tested locally with `./x.py test src/tools/rls` and seems to be working as expected.
I noticed the rustfmt merge didn't trigger toolstate upgrade (because we pruned most but not all of the related machinery?), so I'd rather get this rubber-stamped by someone more knowledgeable with infra/the merged changes in case I missed something and need to include something else here to unbreak the RLS toolstate.
bors [Sun, 16 May 2021 23:00:53 +0000 (23:00 +0000)]
Auto merge of #84993 - eddyb:cg-ssa-on-demand-blocks, r=nagisa
rustc_codegen_ssa: only create backend `BasicBlock`s as-needed.
Instead of creating one backend (e.g. LLVM) block per MIR block ahead of time, and then deleting the ones that weren't visited, this PR moves to creating the blocks as they're needed (either reached via the RPO visit, or used as the target of a branch from a different block).
As deleting a block was the only `unsafe` builder method (generally we only *create* backend objects, not *remove* them), that's gone now and codegen is overall a bit safer.
The only change in output is the order of LLVM blocks (which AFAIK has no semantic meaning, other than the first block being the entry block). This happens because the blocks are now created due to control-flow edges, rather than MIR block order.
I'm making this a standalone PR because I keep getting wild perf results when I change *anything* in codegen, but if you want to read more about my plans in this area, see https://github.com/rust-lang/rust/pull/84771#issuecomment-830636256 (and https://github.com/rust-lang/rust/pull/84771#issue-628295651 - but that may be a bit outdated).
(You may notice some of the APIs in this PR, like `append_block`, don't help with the future plans - but I didn't want to include the necessary refactors that pass a build around everywhere, in this PR, so it's a small compromise)
bors [Sun, 16 May 2021 20:19:45 +0000 (20:19 +0000)]
Auto merge of #85312 - ehuss:macro_use-unused-attr, r=petrochenkov
Fix unused attributes on macro_rules.
The `unused_attributes` lint wasn't firing on attributes of `macro_rules` definitions. The consequence is that many attributes are silently ignored on `macro_rules`. The reason is that `unused_attributes` is a late-lint pass, and only has access to the HIR, which does not have macro_rules definitions.
My solution here is to change `non_exported_macro_attrs` to be `macro_attrs` (a list of all attributes used for `macro_rules`, instead of just those for `macro_export`), and then to check this list in the `unused_attributes` lint. There are a number of alternate approaches, but this seemed the most reliable and least invasive. I am open to completely different approaches, though.
One concern is that I don't fully understand the implications of extending `non_exported_macro_attrs` to include non-exported macros. That list was originally added in #62042 to handle stability attributes, so I suspect it was just an optimization since that was all that was needed. It was later extended to be included in SVH in #83901. #80641 also added a use to check for `invalid` attributes, which seems a little odd to me (it didn't validate non-exported macros, and seems highly specific).
Overall, there doesn't seem to be a clear story of when `unused_attributes` should be used versus an error like E0518. I considered alternatively using an "allow list" of built-in attributes that can be used on macro_rules (allow, warn, deny, forbid, cfg, cfg_attr, macro_export, deprecated, doc), but I feel like that could be a pain to maintain.
Some built-in attributes already present hard-errors when used with macro_rules. These are each hard-coded in various places:
- `derive`
- `test` and `bench`
- `proc_macro` and `proc_macro_derive`
- `inline`
- `global_allocator`
The primary motivation is that I sometimes see people use `#[macro_use]` in front of `macro_rules`, which indicates there is some confusion out there (evident that there was even a case of it in rustc).