remove the ability to disable ABI checking
This got deprecated in https://github.com/rust-lang/miri/pull/3071, about half a year ago.
`@rust-lang/miri` I think it's fine to remove this now.
Bump mio from 0.8.10 to 0.8.11 in /test_dependencies
Bumps [mio](https://github.com/tokio-rs/mio) from 0.8.10 to 0.8.11.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/tokio-rs/mio/blob/master/CHANGELOG.md">mio's changelog</a>.</em></p>
<blockquote>
<h1>0.8.11</h1>
<ul>
<li>Fix receiving IOCP events after deregistering a Windows named pipe
(<a href="https://redirect.github.com/tokio-rs/mio/pull/1760">tokio-rs/mio#1760</a>, backport pr:
<a href="https://redirect.github.com/tokio-rs/mio/pull/1761">tokio-rs/mio#1761</a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="0328bdef90"><code>0328bde</code></a> Release v0.8.11</li>
<li><a href="7084498512"><code>7084498</code></a> Fix warnings</li>
<li><a href="90d4fe00df"><code>90d4fe0</code></a> named-pipes: fix receiving IOCP events after deregister</li>
<li><a href="c710a307f8"><code>c710a30</code></a> Add v0.8.x to the CI</li>
<li><a href="c29e21c244"><code>c29e21c</code></a> Release v0.8.10</li>
<li>See full diff in <a href="https://github.com/tokio-rs/mio/compare/v0.8.10...v0.8.11">compare view</a></li>
</ul>
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disable diagnostic deduplication
`@oli-obk` is there a better way to do this? Ideally we'd only set this when interpretation starts but the value in the compiler session seems to be immutable. I assume people will do `cargo check` before `cargo miri` so hopefully this won't lead to too much confusion.
Fixes https://github.com/rust-lang/miri/issues/3350
Fix .\miri fmt on Windows
This allows .\miri fmt to work on Windows. Closes#3317.
To reiterate, the problem with using `miri fmt` on Windows is that the CLI arguments to rustfmt are too long. Currently over 65,000 characters are used in the call to rustfmt, [which is incompatible with Windows](https://devblogs.microsoft.com/oldnewthing/20031210-00/?p=41553) as it is limited to (2^15 - 1) for all arguments plus all env vars.
Two things are done do get around this limit:
1. Call out to cargo-fmt for the crates that exist.
2. Batch rustfmt calls by length
Another alternative would be to just use rustfmt for everything and don't use cargo-fmt for the crates.
I don't know how much you guys may care about `miri fmt` time to run. I don't know the diff as it did not work before on my computer.
[I have another branch that solves this, but in a less permanent way](RossSmyth/miri/tree/windows-fmt). That was my initial attempt, and I learned that even with cargo-fmt and relative paths, the rustfmt call still has 27k characters. This is closer to the limit than I expected, so it would not be a permanent solution. So I went back to absolute paths & batching.
log when we change the active thread, and fix logging for concurrency
Also avoid relying on the incorrect scope exit logging produced by tracing (Cc https://github.com/rust-lang/miri/issues/2266)
print thread name in miri error backtraces; add option to track read/write accesses
This came up while debugging https://github.com/rust-lang/rust/issues/121626. It didn't end up being useful there but still seems like good tools to have around.
Emitter cleanups
Some cleanups I made when reading emitter code. In particular, `HumanEmitter` and `JsonEmitter` have gone from three constructors to one.
r? `@oli-obk`
Count stashed errors again
Stashed diagnostics are such a pain. Their "might be emitted, might not" semantics messes with lots of things.
#120828 and #121206 made some big changes to how they work, improving some things, but still leaving some problems, as seen by the issues caused by #121206. This PR aims to fix all of them by restricting them in a way that eliminates the "might be emitted, might not" semantics while still allowing 98% of their benefit. Details in the individual commit logs.
r? `@oli-obk`
Use volatile access instead of `#[used]` for `on_tls_callback`
The first commit adds a volatile load of `p_thread_callback` when registering a dtor so that the compiler knows if the callback is used or not. I don't believe the added volatile instruction is otherwise significant in the context. In my testing using the volatile load allowed the compiler to correctly reason about whether `on_tls_callback` is used or not, allowing it to be omitted entirely in some cases. Admittedly it usually is used due to `Thread` but that can be avoided (e.g. in DLLs or with custom entry points that avoid the offending APIs). Ideally this would be something the compiler could help a bit more with so we didn't have to use tricks like `#[used]` or volatile. But alas.
I also used this as an opportunity to clean up the `unused` lints which I don't think serve a purpose any more.
The second commit removes the volatile load of `_tls_used` with `#cfg[target_thread_local]` because `#[thread_local]` already implies it. And if it ever didn't then `#[thread_local]` would be broken when there aren't any dtors.
Skip unnecessary comparison with half-open range patterns
This is the last remaining detail in the implementation of half-open range patterns. Until now, a half-open range pattern like `10..` was converted to `10..T::MAX` before lowering to MIR, which generated an extra pointless comparison. With this PR we don't generate it.
pattern_analysis: rework how we hide empty private fields
Consider this:
```rust
mod foo {
pub struct Bar {
pub a: bool,
b: !,
}
}
fn match_a_bar(bar: foo::Bar) -> bool {
match bar {
Bar { a, .. } => a,
}
}
```
Because the field `b` is private, matches outside the module are not allowed to observe the fact that `Bar` is empty. In particular `match bar {}` is valid within the module `foo` but an error outside (assuming `exhaustive_patterns`).
We currently handle this by hiding the field `b` when it's both private and empty. This means that the pattern `Bar { a, .. }` is lowered to `Bar(a, _)` if we're inside of `foo` and to `Bar(a)` outside. This involves a bit of a dance to keep field indices straight. But most importantly this makes pattern lowering depend on the module.
In this PR, I instead do nothing special when lowering. Only during analysis do we track whether a place must be skipped.
r? `@compiler-errors`
