[RFC 2011] Optimize non-consuming operators
Tracking issue: https://github.com/rust-lang/rust/issues/44838
Fifth step of https://github.com/rust-lang/rust/pull/96496
The most non-invasive approach that will probably have very little to no performance impact.
## Current behaviour
Captures are handled "on-the-fly", i.e., they are performed in the same place expressions are located.
```rust
// `let a = 1; let b = 2; assert!(a > 1 && b < 100);`
if !(
{ ***try capture `a` and then return `a`*** } > 1 && { ***try capture `b` and then return `b`*** } < 100
) {
panic!( ... );
}
```
As such, some overhead is likely to occur (Specially with very large chains of conditions).
## New behaviour for non-consuming operators
When an operator is known to not take `self`, then it is possible to capture variables **AFTER** the condition.
```rust
// `let a = 1; let b = 2; assert!(a > 1 && b < 100);`
if !( a > 1 && b < 100 ) {
{ ***try capture `a`*** }
{ ***try capture `b`*** }
panic!( ... );
}
```
So the possible impact on the runtime execution time will be diminished.
r? ````@oli-obk````
Remove `MAX_SUGGESTION_HIGHLIGHT_LINES`
After #97798 the `MAX_SUGGESTION_HIGHLIGHT_LINES` constant doesn't really make sense since we always show full suggestions. This PR removes last usages of the constant and the constant itself.
r? ``@flip1995`` (this mostly does changes in clippy)
attempt to optimise vectored write
benchmarked:
old:
```
test io::cursor::tests::bench_write_vec ... bench: 68 ns/iter (+/- 2)
test io::cursor::tests::bench_write_vec_vectored ... bench: 913 ns/iter (+/- 31)
```
new:
```
test io::cursor::tests::bench_write_vec ... bench: 64 ns/iter (+/- 0)
test io::cursor::tests::bench_write_vec_vectored ... bench: 747 ns/iter (+/- 27)
```
More unsafe than I wanted (and less gains) in the end, but it still does the job
Only keep a single query for well-formed checking
There are currently 3 queries to perform wf checks on different item-likes. This complexity is not required.
This PR replaces the query by:
- one query per item;
- one query to invoke it for a whole module.
This allows to remove HIR `ParItemLikeVisitor`.
libcore tests: avoid int2ptr casts
We don't need any of these pointers to actually be dereferenceable so using `ptr::invalid` should be fine. And then we can run Miri with strict provenance enforcement on the tests.
Add triagebot mentions.
This migrates the configuration of mentions from highfive to triagebot.
I also fixed a few broken paths (error_codes.rs src/librustdoc/html/static/themes src/librustdoc/html/static/themes/ayu.css).
liballoc tests: avoid int2ptr cast
I think we don't need `ptr::from_exposed_addr` here; `ptr::invalid` should be enough for this test. (And this makes Miri less unhappy when running these tests.)
Fix "kind" for associated types in trait implementations in rustdoc JSON
Fixes https://github.com/rust-lang/rust/issues/81340.
Contrary to what is suggested in the issue, I really think we should distinguish between associated items and "normal" constants and types.
cc `@CraftSpider` `@SimonSapin`
r? `@notriddle`
interpret: refactor allocation info query
We now have an infallible function that also tells us which kind of allocation we are talking about.
Also we do longer have to distinguish between data and function allocations for liveness.
This will help us to avoid "catching" `InterpError`s in Miri.
r? `@oli-obk`
Fix rustdoc argument error
Fixes#88756.
It's a take over of #88831. I cherry-picked the commits, fixed the merge conflict and the failing test.
cc `@inashivb` `@jyn514`
r? `@notriddle`
catch unwind in parallel mode during wfcheck
Update #75760
When performing wfcheck, from the test results, the parallel mode will stop all checks when an `item`'s check failed, (e.g. the first ui test failure raised from [here](https://github.com/rust-lang/rust/blob/master/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs#L249))while the serial mode will output each `item`'s check result via `catch_unwind`. This leads to inconsistencies in the final output of the two mode.
In my local environment, this modification prevents the following ui tests from failing when set `parallel-compiler = true` in `config.toml`:
```
[ui] src/test\ui\associated-types\defaults-cyclic-fail-1.rs
[ui] src/test\ui\associated-types\defaults-cyclic-fail-2.rs
[ui] src/test\ui\associated-types\hr-associated-type-bound-2.rs
[ui] src/test\ui\associated-types\impl-wf-cycle-1.rs
[ui] src/test\ui\associated-types\impl-wf-cycle-2.rs
[ui] src/test\ui\issues\issue-20413.rs
[ui] src/test\ui\parallel_test\defaults-cyclic-fail-para.rs
```
When attempting to build rustc with LLVM on Windows, I noticed that the CRT flag provided to the C and C++ Compilers was inconsistent:
```
"-DCMAKE_C_FLAGS=-nologo -MT -Brepro" "-DCMAKE_CXX_FLAGS=-nologo -MD -Brepro"
```
Since the bootstrapper also sets the various `LLVM_USE_CRT` variables, this resulted in cl.exe reporting a bunch of warnings:
```
cl : Command line warning D9025 : overriding '/MD' with '/MT'
```
The root cause for this is that `cc_detect::find` was creating a `cc::Build` twice, but didn't set `static_crt` the second time.
It's possible that this what is also causing #81381
