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Rollup of 12 pull requests #94162

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m-ou-se and others added 30 commits February 4, 2022 12:27
RustHermit and HermitCore is able to run on aarch64 and x86_64.
In the future these operating systems will also support RISC-V.
Consequently, the dependency to a specific target should be removed.
Building hermit-abi fails if the architecture isn't supported.
No functional changes intended.

This updates the test case to use llvm-nm instead of the system nm.
This fixes an instance over at the experimental build of rustc with HEAD LLVM:
https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/8380#ef6f41b5-8595-49a6-be37-0eff80e0ccb5
It is related to rust-lang#94001.

The issue is that this test uses the system nm, which may not be recent
enough to understand the update to uwtable. This replaces the test to
use the llvm-nm that should be recent enough (consistent with the LLVM
sources we use to build rustc).
Co-authored-by: Jubilee Young <workingjubilee@gmail.com>
The optimization was proposed by @falk-hueffner in https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Micro-optimizing.20char.3A.3Afrom_u32/near/272146171,  and I simplified it a bit and added an explanation of why the optimization is correct.
The `macro_rules!` implementation was becomng excessively complicated,
and difficult to modify. The new proc macro implementation should make
it much easier to add new features (e.g. skipping certain `#[derive]`s)
92d20c4 removed no-variants special
case from try_destructure_const with expectation that this case would be
handled gracefully when read_discriminant returns an error.

Alas in that case read_discriminant succeeds while returning a
non-existing variant, so the special case is still necessary.
…iplett

core: Implement ASCII trim functions on byte slices

Hi `````@rust-lang/libs!````` This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead.

This PR adds three new methods to byte slices:

- `trim_ascii_start`
- `trim_ascii_end`
- `trim_ascii`

I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose.

As per the [std dev guide](https://std-dev-guide.rust-lang.org/feature-lifecycle/new-unstable-features.html), this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun.

Tracking issue: rust-lang#94035
Convert `newtype_index` to a proc macro

The `macro_rules!` implementation was becomng excessively complicated,
and difficult to modify. The new proc macro implementation should make
it much easier to add new features (e.g. skipping certain `#[derive]`s)
…acro, r=notriddle

rustdoc: Avoid duplicating macros in sidebar

Fixes rust-lang#93912.

cc ````@jsha```` (for the GUI test)
r? ````@camelid````
removing architecture requirements for RustyHermit

RustHermit and HermitCore is able to run on aarch64 and x86_64. In the future these operating systems will also support RISC-V. Consequently, the dependency to a specific target should be removed.

The build process of `hermit-abi` fails if the architecture isn't supported.
…=Mark-Simulacrum

adapt static-nobundle test to use llvm-nm

No functional changes intended.

This updates the test case to use llvm-nm instead of the system nm.
This fixes an instance over at the experimental build of rustc with HEAD LLVM:
https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/8380#ef6f41b5-8595-49a6-be37-0eff80e0ccb5
It is related to rust-lang#94001.

The issue is that this test uses the system nm, which may not be recent
enough to understand the update to uwtable. This replaces the test to
use the llvm-nm that should be recent enough (consistent with the LLVM
sources we use to build rustc).
…ed-value, r=oli-obk

Fix rustdoc const computed value

Fixes rust-lang#85088.

It looks like this now (instead of hexadecimal):

![Screenshot from 2022-02-17 17-55-39](https://user-images.githubusercontent.com/3050060/154532115-0f9861a0-406f-4c9c-957f-32bedd8aca7d.png)

r? ``@oli-obk``
Fix pretty printing of enums without variants

92d20c4 removed no-variants special case from `try_destructure_const` with expectation that this case would be handled gracefully when `read_discriminant` returns an error.

Alas in that case `read_discriminant` succeeds while returning a non-existing variant, so the special case is still necessary.

Fixes rust-lang#94073.

r? `@oli-obk`
…cjgillot

Add module-level docs for `rustc_middle::query`
Optimize char_try_from_u32

The optimization was proposed by ````@falk-hueffner```` in https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Micro-optimizing.20char.3A.3Afrom_u32/near/272146171,  and I simplified it a bit and added an explanation of why the optimization is correct. The generated code is 2 instructions shorter and uses 2 registers instead of 4 on x86.
…otriddle

Fix miniz_oxide types showing up in std docs

Fixes rust-lang#90526.

Thanks to ````@camelid,```` I rediscovered `doc(masked)`, allowing us to prevent `miniz_oxide` type to show up in std docs.

r? ````@notriddle````
@rustbot rustbot added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. rollup A PR which is a rollup labels Feb 19, 2022
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@bors r+ rollup=never p=12

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bors commented Feb 19, 2022

📌 Commit 4108ebc has been approved by matthiaskrgr

@bors bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Feb 19, 2022
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bors commented Feb 19, 2022

⌛ Testing commit 4108ebc with merge 74f494b9084dc41ace6f43018b63aa950312448e...

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The job x86_64-gnu-stable failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)
[RUSTC-TIMING] rustc_expand test:false 1.876
    Checking rustc_builtin_macros v0.0.0 (/checkout/compiler/rustc_builtin_macros)
 Documenting rustc_builtin_macros v0.0.0 (/checkout/compiler/rustc_builtin_macros)
[RUSTC-TIMING] rustc_builtin_macros test:false 1.819
error: unresolved link to `wrapper`
     |
     |
1844 | /     /// A [newtype'd][wrapper] index type in the MIR [control-flow graph][CFG]
1845 | |     ///
1846 | |     /// A field (e.g., `f` in `_1.f`) is one variant of [`ProjectionElem`]. Conceptually,
1847 | |     /// rustc can identify that a field projection refers to either two different regions of memory
...    |
1851 | |     /// [CFG]: https://rustc-dev-guide.rust-lang.org/appendix/background.html#cfg
1852 | |     /// [mir-datatypes]: https://rustc-dev-guide.rust-lang.org/mir/index.html#mir-data-types
     |
     |
     = note: `-D rustdoc::broken-intra-doc-links` implied by `-D warnings`
     = note: the link appears in this line:
             
             A [newtype'd][wrapper] index type in the MIR [control-flow graph][CFG]
     = note: no item named `wrapper` in scope
     = note: no item named `wrapper` in scope
     = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
error: unresolved link to `CFG`
    --> compiler/rustc_middle/src/mir/mod.rs:1844:5
     |
     |
1844 | /     /// A [newtype'd][wrapper] index type in the MIR [control-flow graph][CFG]
1845 | |     ///
1846 | |     /// A field (e.g., `f` in `_1.f`) is one variant of [`ProjectionElem`]. Conceptually,
1847 | |     /// rustc can identify that a field projection refers to either two different regions of memory
...    |
1851 | |     /// [CFG]: https://rustc-dev-guide.rust-lang.org/appendix/background.html#cfg
1852 | |     /// [mir-datatypes]: https://rustc-dev-guide.rust-lang.org/mir/index.html#mir-data-types
     |
     = note: the link appears in this line:
             
             
             A [newtype'd][wrapper] index type in the MIR [control-flow graph][CFG]
     = note: no item named `CFG` in scope
     = note: no item named `CFG` in scope
     = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`

error: this URL is not a hyperlink
     |
     |
1844 | /     /// A [newtype'd][wrapper] index type in the MIR [control-flow graph][CFG]
1845 | |     ///
1846 | |     /// A field (e.g., `f` in `_1.f`) is one variant of [`ProjectionElem`]. Conceptually,
1847 | |     /// rustc can identify that a field projection refers to either two different regions of memory
...    |
1851 | |     /// [CFG]: https://rustc-dev-guide.rust-lang.org/appendix/background.html#cfg
1852 | |     /// [mir-datatypes]: https://rustc-dev-guide.rust-lang.org/mir/index.html#mir-data-types
     | |____________________________________________________________________________________________^ help: use an automatic link instead: `<https://rustc-dev-guide.rust-lang.org/appendix/glossary.html#newtype>`
     |
     = note: `-D rustdoc::bare-urls` implied by `-D warnings`
     = note: bare URLs are not automatically turned into clickable links

error: this URL is not a hyperlink
     |
     |
1844 | /     /// A [newtype'd][wrapper] index type in the MIR [control-flow graph][CFG]
1845 | |     ///
1846 | |     /// A field (e.g., `f` in `_1.f`) is one variant of [`ProjectionElem`]. Conceptually,
1847 | |     /// rustc can identify that a field projection refers to either two different regions of memory
...    |
1851 | |     /// [CFG]: https://rustc-dev-guide.rust-lang.org/appendix/background.html#cfg
1852 | |     /// [mir-datatypes]: https://rustc-dev-guide.rust-lang.org/mir/index.html#mir-data-types
     | |____________________________________________________________________________________________^ help: use an automatic link instead: `<https://rustc-dev-guide.rust-lang.org/appendix/background.html#cfg>`
     |
     = note: bare URLs are not automatically turned into clickable links

error: this URL is not a hyperlink
     |
     |
1844 | /     /// A [newtype'd][wrapper] index type in the MIR [control-flow graph][CFG]
1845 | |     ///
1846 | |     /// A field (e.g., `f` in `_1.f`) is one variant of [`ProjectionElem`]. Conceptually,
1847 | |     /// rustc can identify that a field projection refers to either two different regions of memory
...    |
1851 | |     /// [CFG]: https://rustc-dev-guide.rust-lang.org/appendix/background.html#cfg
1852 | |     /// [mir-datatypes]: https://rustc-dev-guide.rust-lang.org/mir/index.html#mir-data-types
     | |____________________________________________________________________________________________^ help: use an automatic link instead: `<https://rustc-dev-guide.rust-lang.org/mir/index.html#mir-data-types>`
     |
     = note: bare URLs are not automatically turned into clickable links
error: could not document `rustc_middle`

Caused by:
Caused by:
  process didn't exit successfully: `/checkout/obj/build/bootstrap/debug/rustdoc --edition=2021 --crate-type lib --crate-name rustc_middle compiler/rustc_middle/src/lib.rs --target x86_64-unknown-linux-gnu -o /checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/doc --error-format=json --json=diagnostic-rendered-ansi,future-incompat -C metadata=1b73d1ddb2dc71c9 -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/release/deps --extern bitflags=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/libbitflags-17521ded70cd206c.rmeta --extern chalk_ir=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/libchalk_ir-2e112d3b4bd3a943.rmeta --extern either=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/libeither-5c06d7d1a4a7c2ac.rmeta --extern gsgdt=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/libgsgdt-ca234ec367d1272e.rmeta --extern polonius_engine=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/libpolonius_engine-ddd207219af52877.rmeta --extern rand=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librand-cf1485162b26a25a.rmeta --extern rand_xoshiro=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librand_xoshiro-4c5698e56ae2b836.rmeta --extern rustc_rayon=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_rayon-13636ceca7dce130.rmeta --extern rustc_rayon_core=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_rayon_core-14a7223e4d89800c.rmeta --extern rustc_apfloat=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_apfloat-234297eac9bfc556.rmeta --extern rustc_arena=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_arena-2641742aea1db5aa.rmeta --extern rustc_ast=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_ast-6bb237822b00488f.rmeta --extern rustc_attr=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_attr-289b18167731059d.rmeta --extern rustc_data_structures=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_data_structures-a86d4359906a94a8.rmeta --extern rustc_errors=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_errors-e56e7cbc8ae9db50.rmeta --extern rustc_feature=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_feature-8785cc43b8977e56.rmeta --extern rustc_graphviz=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_graphviz-802a340a7a993eee.rmeta --extern rustc_hir=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_hir-41674eea628ce851.rmeta --extern rustc_index=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_index-b2be072e02e654c1.rmeta --extern rustc_macros=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/release/deps/librustc_macros-ba86bb43634aaa81.so --extern rustc_query_system=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_query_system-b8db69b00aeeec18.rmeta --extern rustc_serialize=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_serialize-bbea91bef2fd8c04.rmeta --extern rustc_session=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_session-4fb56829f368d330.rmeta --extern rustc_span=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_span-e31ca7c57949b75c.rmeta --extern rustc_target=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_target-325d08b4a94d7190.rmeta --extern rustc_type_ir=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_type_ir-6fdd790f76ddcc49.rmeta --extern smallvec=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/libsmallvec-66481e7c74444ad9.rmeta --extern tracing=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-rustc/x86_64-unknown-linux-gnu/release/deps/libtracing-f9b89a91db3bd4be.rmeta --extern-html-root-url 'bitflags=https://docs.rs/bitflags/1.2.1/' --extern-html-root-url 'chalk_ir=https://docs.rs/chalk-ir/0.76.0/' --extern-html-root-url 'either=https://docs.rs/either/1.6.0/' --extern-html-root-url 'gsgdt=https://docs.rs/gsgdt/0.1.2/' --extern-html-root-url 'polonius_engine=https://docs.rs/polonius-engine/0.13.0/' --extern-html-root-url 'rand=https://docs.rs/rand/0.8.4/' --extern-html-root-url 'rand_xoshiro=https://docs.rs/rand_xoshiro/0.6.0/' --extern-html-root-url 'rustc_rayon=https://docs.rs/rustc-rayon/0.3.2/' --extern-html-root-url 'rustc_rayon_core=https://docs.rs/rustc-rayon-core/0.3.2/' --extern-html-root-url 'smallvec=https://docs.rs/smallvec/1.7.0/' --extern-html-root-url 'tracing=https://docs.rs/tracing/0.1.29/' -Zunstable-options -Csymbol-mangling-version=v0 -Dwarnings '-Wrustdoc::invalid_codeblock_attributes' --crate-version '1.60.0
  (74f494b90
  2022-02-19)' --document-private-items '-Arustdoc::private-intra-doc-links' --enable-index-page -Zunstable-options -Znormalize-docs --show-type-layout --generate-link-to-definition --extern-html-root-url 'ena=https://docs.rs/ena/latest/'` (exit status: 1)
[RUSTC-TIMING] rustc_middle test:false 25.575
error: build failed
Build completed unsuccessfully in 0:38:01

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bors commented Feb 19, 2022

💔 Test failed - checks-actions

@bors bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Feb 19, 2022
@matthiaskrgr matthiaskrgr deleted the rollup-fbwdwyo branch March 11, 2022 15:32
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