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fix for late-bound regions
Fix for https://github.com/rust-lang/rust/issues/53419
r? @nikomatsakis
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or "".into()
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Rollup of 11 pull requests
Successful merges:
- #53112 (pretty print BTreeSet)
- #53208 (Don't panic on std::env::vars() when env is null.)
- #53226 (driver: set the syntax edition in phase 1)
- #53229 (Make sure rlimit is only ever increased)
- #53233 (targets: aarch64: Add bare-metal aarch64 target)
- #53239 (rustc_codegen_llvm: Restore the closure env alloca hack for LLVM 5.)
- #53246 (A few cleanups)
- #53257 (Idiomatic improvements to IP method)
- #53274 (Remove statics field from CodegenCx)
- #53290 (Make LLVM emit assembly comments with -Z asm-comments)
- #53317 (Mark prior failure to avoid ICE)
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Make sure rlimit is only ever increased
`libc::setrlimit` will fail if we try to set the rlimit to a value lower than it is currently, so make sure we're never trying to do this. Fixes #52801.
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driver: set the syntax edition in phase 1
Fixes https://github.com/rust-lang/rust/issues/53203
It seems the way libsyntax handles the desired edition is to use a global, set via `syntax_pos::hygiene::set_default_edition`. Right now, this is set in the driver in `run_compiler`, which is the entry point for running the compiler all the way through to emitting files. Since rustdoc doesn't use this function, it wasn't properly setting this global. (When initially setting up editions in rustdoc, i'd assumed that setting `sessopts.edition` would have done this... `>_>`) This was "fixed" for doctests in https://github.com/rust-lang/rust/pull/52385, but rather than patching in a call to `set_default_edition` in all the places rustdoc sets up the compiler, i've instead moved the call in the driver to be farther in the process. This means that any use of `phase_1_parse_input` with the right session options will have the edition properly set without having to also remember to set libsyntax up separately.
r? @rust-lang/compiler
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Move SmallVector and ThinVec out of libsyntax
- move `libsyntax::util::SmallVector` tests to `librustc_data_structures::small_vec`
- remove `libsyntax::util::SmallVector`
- move `libsyntax::util::thin_vec` to `librustc_data_structures::thin_vec`
Other than moving these data structures where they belong it allows modules using `SmallVector<T>` (`SmallVec<[T; 1]>`) to specify their own length (e.g. 8 or 32) independently from `libsyntax`.
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Cleanup to librustc::session and related code
No functional changes, just some cleanup.
This also creates the `rustc_fs_util` crate, but I can remove that change if desired. It felt a little odd to force crates to depend on librustc for some fs utilities; and also seemed good to generally keep the size of librustc lower (for compile times); fs_util will compile in parallel with essentially the first crate since it has no dependencies beyond std.
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make `everybody_loops` preserve item declarations
First half of https://github.com/rust-lang/rust/issues/52545.
`everybody_loops` is used by rustdoc to ensure we don't contain erroneous references to platform APIs if one of its uses is pulled in by `#[doc(cfg)]`. However, you can also implement traits for public types inside of functions. This is used by Diesel (probably others, but they were the example that was reported) to get around a recent macro hygiene fix, which has caused their crate to fail to document. While this won't make the traits show up in documentation (that step comes later), it will at least allow files to be generated.
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This is a clippy-breaking change.
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Don't format!() string literals
Prefer `to_string()` to `format!()` take 2, this time targetting string literals. In some cases (`&format!("...")` -> `"..."`) also removes allocations. Occurences of `format!("")` are changed to `String::new()`.
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Replace push loops with extend() where possible
Or set the vector capacity where I couldn't do it.
According to my [simple benchmark](https://gist.github.com/ljedrz/568e97621b749849684c1da71c27dceb) `extend`ing a vector can be over **10 times** faster than `push`ing to it in a loop:
10 elements (6.1 times faster):
```
test bench_extension ... bench: 75 ns/iter (+/- 23)
test bench_push_loop ... bench: 458 ns/iter (+/- 142)
```
100 elements (11.12 times faster):
```
test bench_extension ... bench: 87 ns/iter (+/- 26)
test bench_push_loop ... bench: 968 ns/iter (+/- 3,528)
```
1000 elements (11.04 times faster):
```
test bench_extension ... bench: 311 ns/iter (+/- 9)
test bench_push_loop ... bench: 3,436 ns/iter (+/- 233)
```
Seems like a good idea to use `extend` as much as possible.
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Prefer to_string() to format!()
Simple benchmarks suggest in some cases it can be faster by even 37%:
```
test converting_f64_long ... bench: 339 ns/iter (+/- 199)
test converting_f64_short ... bench: 136 ns/iter (+/- 34)
test converting_i32_long ... bench: 87 ns/iter (+/- 16)
test converting_i32_short ... bench: 87 ns/iter (+/- 49)
test converting_str ... bench: 54 ns/iter (+/- 15)
test formatting_f64_long ... bench: 349 ns/iter (+/- 176)
test formatting_f64_short ... bench: 145 ns/iter (+/- 14)
test formatting_i32_long ... bench: 98 ns/iter (+/- 14)
test formatting_i32_short ... bench: 93 ns/iter (+/- 15)
test formatting_str ... bench: 86 ns/iter (+/- 23)
```
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Misc cleanups
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Add the -Zcrate-attr=foo unstable rustc option
This PR adds a new unstable option to `rustc`: `-Zcrate-attr=foo`. The option can be used to inject crate-level attributes from the CLI, and it's meant to be used by tools like Crater that needs to add their own attributes to a crate without changing the source code.
The exact reason I need this is to implement "edition runs" in Crater: we need to add the preview feature flag to every crate, and editing the crates' source code on the fly might produce unexpected results, while a compiler flag is more reliable.
cc https://github.com/rust-lang-nursery/crater/issues/282 @Mark-Simulacrum
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Use a slice where a vector is not necessary
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Rollup of bare_trait_objects PRs
All deny attributes were moved into bootstrap so they can be disabled with a line of config.
Warnings for external tools are allowed and it's up to the tool's maintainer to keep it warnings free.
r? @Mark-Simulacrum
cc @ljedrz @kennytm
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