This is an adaptation of alexcrichton/futures-rs#597 for the standard library.
The goal here is to avoid locking a mutex on the "fast path" for thread
park/unpark where you're waking up a thread that isn't sleeping or otherwise
trying to park a thread that's already been notified. Mutex performance varies
quite a bit across platforms so this should provide a nice consistent speed
boost for the fast path of these functions.
This is sort of a long overdue change from the investigation in #29293
and #37477. The released binaries of rustc don't have debug information and so
don't actively suffer this problem but this can hit local development of rustc
and also larger programs compiled against libstd generating backtraces.
The main purpose of the mmap allocator in libacktrace is to be usable from a
signal handler, but we don't do that, so the normal allocator using malloc/free
should work well for us.
Use 128 bit instead of Symbol for crate disambiguator
As discussed on gitter, this changes `crate_disambiguator` from Strings to what they are represented as, a 128 bit number.
There's also one bit I think also needs to change, but wasn't 100% sure how: [create_root_def](f338dba297/src/librustc/hir/map/definitions.rs (L468-L482)). Should I change `DefKey::root_parent_stable_hash` to accept `Fingerprint` as crate_disambiguator to quickly combine the hash of `crate_name` with the new 128 bit hash instead of a string for a disambiguator?
r? @michaelwoerister
EDIT: Are those 3 tests `mir-opt` failing, because the hash is different, because we calculate it a little bit differently (storing directly instead of hashing the hex-string representation)? Should it be updated like in #45319?
bootstrap: Add openssl configuration for sparc64-unknown-linux-gnu
Hi!
This adds the target missing mapping for sparc64-unknown-linux-gnu.
See: https://github.com/rust-lang/rust/issues/45456
Thanks
Improve diagnostic of E0119 with extern crate, try to print the conflicting impl.
Closes#27403.
Closes#23563.
Should improve #23980.
The diagnostic now looks like:
```
error[E0119]: conflicting implementations of trait `std::convert::Into<_>` for type `GenX<_>`:
--> $DIR/issue-27403.rs:15:1
|
15 | / impl<S> Into<S> for GenX<S> {
16 | | fn into(self) -> S {
17 | | self.inner
18 | | }
19 | | }
| |_^
|
= note: conflicting implementation in crate `core`:
- impl<T, U> std::convert::Into<U> for T
where U: std::convert::From<T>;
error: aborting due to previous error
```
Add Stylo and WebRender to src/tools/cargotest
This is a subset of Servo that takes relatively less time to compile and does not use unstable Rust features.
Remove deprecated `collections` crate.
The real `collections` was merged with `alloc`, this facade was introduced [in this PR](https://github.com/rust-lang/rust/pull/42720) to give `#[no_std]` users time to adapt. This was done at least two cycles ago, now we can consider removing it for good.
Due to rust-lang/cargo#4570, a `*.dll.lib` file is uplifted when building
dynamic libraries on Windows. The current bootstrap code does not
understand files with multiple extensions, and will instead assume
`xxxx.dll` is the file name. This caused a `no output generated` error
because it tries to search for `xxxx.dll-hash.lib` inside the `deps/`
folder, while it should check for `xxxx-hash.dll.lib` instead.
This PR is blocking #45285 (Bump to 1.23 and update bootstrap).
Create NormalizeTy query
As part of the effort to solve #44891, I've created the normalize_ty query.
As outlined in the issue this meant:
- renamed `normalize_associated_type()` to `normalize_associated_type_in()`
- created the `normalize_ty` query
- substituted the use of memoize with the query
This PR is not ready. While running tests, one of the incremental ones failed. [This](https://pastebin.com/vGhH6bv6) is the error I got.
Move Generics from MethodSig to TraitItem and ImplItem
As part of `rust-impl-period/WG-compiler-traits`, we want to "lift" `Generics` from `MethodSig` into `TraitItem` and `ImplItem`. This is in preparation for adding associated type generics. (https://github.com/rust-lang/rust/issues/44265#issuecomment-331172238)
Currently this change is only made in the AST. In the future, it may also impact the HIR. (Still discussing)
To understand this PR, it's probably best to start from the changes to `ast.rs` and then work your way to the other files to understand the far reaching effects of this change.
r? @nikomatsakis
These functions were deprecated and removed in 1.5, but such simple
functionality shouldn't require using unsafe code, and it isn't
cluttering libstd too much.
Now that we are visiting things in a different order during lowering,
adding parameters winds up affecting the HirIds assigned to thinks in
the method body, whereas it didn't before. We could fix this by
reordering the order in which we visit `generics` during lowering, but
this feels very fragile. Seems better to just let typeck tables be
dirty here.
