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`codegen_ssa` cleanups
Some clarifications I made when reading this code closely.
r? `@tmiasko`
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Only golden arches
A number of tests in the test suite have applied the somewhat comedic practice of ignoring *every* single target architecture that rustc has ever supported. This is silly, when they are clearly tests built around certain assumptions, primarily of the x86-64 architecture, or in one case when they are only relevant for a handful of 32-bit targets. This has even resulted, in one case, in the same architecture being ignored twice!
Document these better, and use a "revision + only-arch" idiom in the test headers to denote the "golden arches" that actually pass these tests.
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This function has some shared code for the thin LTO and fat LTO cases,
but those cases have so little in common that it's actually clearer to
treat them fully separately.
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PR #112946 tweaked the naming of LLVM threads, but messed things up
slightly, resulting in threads on Windows having names like `optimize
module {} regex.f10ba03eb5ec7975-cgu.0`.
This commit removes the extraneous `{} `.
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It makes things a little clearer.
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The main loop has a *very* complex condition, which includes two
mentions of `codegen_state`. The body of the loop then immediately
switches on the `codegen_state`.
I find it easier to understand if it's a `loop` and we check for exit
conditions after switching on `codegen_state`. We end up with a tiny bit
of code duplication, but it's clear that (a) we never exit in the
`Ongoing` case, (b) we exit in the `Completed` state only if several
things are true (and there's interaction with LTO there), and (c) we
exit in the `Aborted` state if a couple of things are true. Also, the
exit conditions are all simple conjunctions.
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This loop condition involves `codegen_state`, `work_items`, and
`running_with_own_token`. But the body of the loop cannot modify
`codegen_state`, so repeatedly checking it is unnecessary.
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The two functions are alway called together. This commit factors out the
repeated code.
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`CodegenContext` is immutable except for the `worker` field - we clone
`CodegenContext` in multiple places, changing the `worker` field each
time. It's simpler to move the `worker` field out of `CodegenContext`.
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Because it's usefulness wasn't clear to me, and I initially wondered if
it could be removed. The text is based on the text in #50972, the PR
that added the flag.
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Make it match the corresponding comment at the start of the unstable
options.
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It's no longer used, and `spawn_named_thread` is preferable, because
naming threads is helpful when profiling.
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This is useful when profiling with a profiler like Samply.
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The `Worker` is unnecessary, and just makes it longer than necessary.
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It took me some time to understand how the main thread can lend a
jobserver token to an LLVM thread. This commit renames a couple of
things to make it clearer.
- Rename the `LLVMing` variant as `Lending`, because that is a clearer
description of what is happening.
- Rename `running` as `running_with_own_token`, which makes it clearer
that there might be one additional LLVM thread running (with a loaned
token). Also add a comment to its definition.
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- Thin and fat LTO can't happen together.
- `NeedsLink` and (non-allocator) `Compiled` work item results can't
happen together.
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And rename the `Compiled` variant as `Finished`, because that name makes
it clearer there is nothing left to do, contrasting nicely with the
`Needs*` variants.
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It has a single callsite, and provides little value.
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Fix simd_bswap for i8/u8
#114156 missed this test case ☹️
cc `@workingjubilee`
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Rollup of 4 pull requests
Successful merges:
- #95965 (Stabilize const-weak-new)
- #109075 (Use `LazyLock` to lazily resolve backtraces)
- #113741 (Don't install default projection bound for return-position `impl Trait` in trait methods with no body)
- #114268 (Fix empty_write since rust version attribute)
r? `@ghost`
`@rustbot` modify labels: rollup
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Fix empty_write since rust version attribute
Fixup of https://github.com/rust-lang/rust/pull/98154 for the rust version.
r? ``@workingjubilee``
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r=spastorino
Don't install default projection bound for return-position `impl Trait` in trait methods with no body
This ensures that we never try to project to an opaque type in a trait method that has no body to infer its hidden type, which means we never later call `type_of` on that opaque. This is because opaque types try to reveal their hidden type when proving auto traits.
I thought about this a lot, and I think this is a fix that's less likely to introduce other strange downstream ICEs than #113461.
Fixes #113434
r? `@spastorino`
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Use `LazyLock` to lazily resolve backtraces
By using TAIT to name the initializing closure, `LazyLock` can be used to replace the current `LazilyResolvedCapture`.
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Stabilize const-weak-new
This is a fairly uncontroversial library stabilization, so I'm going ahead and proposing it to ride the trains to stable.
This stabilizes the following APIs, which are defined to be non-allocating constructors.
```rust
// alloc::rc
impl<T> Weak<T> {
pub const fn new() -> Weak<T>;
}
// alloc::sync
impl<T> Weak<T> {
pub const fn new() -> Weak<T>;
}
```
Closes #95091
``@rustbot`` modify labels: +needs-fcp
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clean stage-specific artifacts using `x clean --stage`
fixes #109313
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Bump its stabilization version several times along
the way to accommodate changes in release processes.
Co-authored-by: Mara Bos <m-ou.se@m-ou.se>
Co-authored-by: Trevor Gross <t.gross35@gmail.com>
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Print omitted frames count for short backtrace mode
Fixes #111730
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Signed-off-by: ozkanonur <work@onurozkan.dev>
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Signed-off-by: ozkanonur <work@onurozkan.dev>
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Rollup of 6 pull requests
Successful merges:
- #98154 (merge functionality of `io::Sink` into `io::Empty`)
- #102198 (`const`-stablilize `NonNull::as_ref`)
- #114074 (inline format!() args from rustc_middle up to and including rustc_codegen_llvm (3))
- #114246 (Weaken unnameable_types lint)
- #114256 (Fix invalid suggestion for mismatched types in closure arguments)
- #114258 (Simplify `Span::can_be_used_for_suggestions` a little tiny bit)
r? `@ghost`
`@rustbot` modify labels: rollup
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Simplify `Span::can_be_used_for_suggestions` a little tiny bit
Just something I saw randomly.
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Fix invalid suggestion for mismatched types in closure arguments
This PR fixes the invalid suggestion for mismatched types in closure arguments.
The invalid suggestion came from a wrongly created span in the parser for closure arguments that don't have a type specified. Specifically, the span in this case was the last token span, but in the case of tuples, the span represented the last parenthesis instead of the whole tuple, which is fixed by taking the more accurate span of the pattern.
There is one unfortunate downside of this fix, it worsens even more the diagnostic for mismatched types in closure args without an explicit type. This happens because there is no correct span for implied inferred type. I tried also fixing this but it's a rabbit hole.
Fixes https://github.com/rust-lang/rust/issues/114180
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Weaken unnameable_types lint
`unnameable_types` lint is no longer emitted for
- associated types
- internal types
r? ``@petrochenkov``
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inline format!() args from rustc_middle up to and including rustc_codegen_llvm (3)
r? `@WaffleLapkin`
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`const`-stablilize `NonNull::as_ref`
A bunch of pointer to reference methods have been made unstably const some time ago in #91823 under the feature gate `const_ptr_as_ref`.
Out of these, `NonNull::as_ref` can be implemented as a `const fn` in stable rust today, so i hereby propose to const stabilize this function only.
Tracking issue: #91822
``@rustbot`` label +T-libs-api -T-libs
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merge functionality of `io::Sink` into `io::Empty`
Many times, there is a need for a simple dummy `io::Read`er + `io::Write`r, but currently the only options are `io::Empty` and `io::Sink` respectively. Having both of their functionality together requires writing your own boilerplate for something that makes sense to have in the standard library. This PR adds the functionality of `io::Sink` to `io::Empty`, making `io::Empty` be able to perform the tasks of both of the previous structs. (This idea was first mentioned in #24235)
Note: I also updated some doc comments in `io::utils` in this pull request to fix inconsistencies between `io::Sink` and `io::Empty`.
API Change Proposal: https://github.com/rust-lang/libs-team/issues/49
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[rustdoc] Remove unneeded `clone()` calls for `derive_id`
I realized we were cloning values before passing them to `derive_id` where they are cloned again, which isn't great. Since they'll be cloned anyway, let's allow to pass both by reference and by value.
r? `@notriddle`
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The invalid suggestion came from a wrongly created span in `rustc_parse'
for closure arguments that didn't have a type specified. Specifically,
the span in this case was the last token span, but in the case of
tuples, the span represented the last parenthesis instead of the whole
tuple, which is fixed by taking the more accurate span of the pattern.
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