[significant_drop_tightening] Evaluate the return expression of a block
For whatever reason, the return expression of a block is not contained inside the slice of statements and because of that the lint wasn't evaluating things that could potentially block the release of a lock.
```rust
pub fn example() -> i32 {
let mutex = Mutex::new(1);
let lock = mutex.lock().unwrap();
let _ = *lock;
let _ = *lock;
do_heavy_computation_that_takes_time_and_returns_i32()
}
```
---
changelog: none
<!-- changelog_checked -->
Rollup of 6 pull requests
Successful merges:
- #108031 (Don't recover lifetimes/labels containing emojis as character literals)
- #108046 (Don't allow evaluating queries that were fed in a previous compiler run)
- #108162 (Don't eagerly convert principal to string)
- #108186 (Deny non-lifetime bound vars in `for<..> ||` closure binders)
- #108197 (Update cargo)
- #108205 (link to llvm changes that prompted the special cases)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Update cargo
10 commits in 39c13e67a5962466cc7253d41bc1099bbcb224c3..17b3d0de0897e1c6b8ca347bd39f850bb0a5b9f6 2023-02-12 02:01:08 +0000 to 2023-02-17 19:45:09 +0000
- fix: unsupported protocol error on old macos version (rust-lang/cargo#11733)
- Error on invalid alphanumeric token for crates.io (rust-lang/cargo#11600)
- Add clippy lints (rust-lang/cargo#11722)
- chore: Make dependencies alphabetical order (rust-lang/cargo#11719)
- chore: bump mdbook to 0.4.27 (rust-lang/cargo#11716)
- Amend `mdman` tests. (rust-lang/cargo#11715)
- Run CI for macOS on nightly (rust-lang/cargo#11712)
- doc: doc comments and intra-doc links for `core::compiler` (rust-lang/cargo#11711)
- Ensure em dashes are recognizable in markup (rust-lang/cargo#11646)
- Set CARGO_BIN_NAME environment variable also for binary examples (rust-lang/cargo#11705)
r? `@ghost`
Deny non-lifetime bound vars in `for<..> ||` closure binders
Moves the check for illegal bound var types from astconv to resolve_bound_vars. If a binder is defined to have a type or const late-bound var that's not allowed, we'll resolve any usages to ty error or const error values, so we shouldn't ever see late-bound types or consts in places they aren't expected.
Fixes#108184Fixes#108181Fixes#108192
Don't eagerly convert principal to string
Fixes#108155
~~I haven't yet been able to reproduce the ICE in a minimal example unfortunately.~~ Added a test
Don't allow evaluating queries that were fed in a previous compiler run
r? `@cjgillot`
this code was already unreachable. Also we removed the no_hash + feeding restriction in https://github.com/rust-lang/rust/pull/105220.
Don't recover lifetimes/labels containing emojis as character literals
Fixes#108019.
Note that at the time of this commit, `unic-emoji-char` seems to have data tables only up to Unicode 5.0, but Unicode is already newer than this.
A newer emoji such as `🥺` will not be recognized as an emoji but older emojis such as `🐱` will.
This PR leaves a couple of FIXMEs where `unic_emoji_char::is_emoji` is used.
[significant_drop_tightening] Ignore inexpensive statements
Not all statements that follow the last use of a lock guard are expensive and can therefore be ignored by the lint.
```rust
pub fn foo() -> i32 {
let mutex = Mutex::new(1);
let lock = mutex.lock().unwrap();
let rslt = *lock;
let another = rslt;
another
}
```
---
changelog: [`significant_drop_tightening`]: No longer lints for inexpensive statements after the lock guard
[#10363](https://github.com/rust-lang/rust-clippy/pull/10363)
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Optimize `LazyLock` size
The initialization function was unnecessarily stored separately from the data to be initialized. Since both cannot exist at the same time, a `union` can be used, with the `Once` acting as discriminant. This unfortunately requires some extra methods on `Once` so that `Drop` can be implemented correctly and efficiently.
`@rustbot` label +T-libs +A-atomic
Add sanitizer support for modern iOS platforms
asan and tsan generally support iOS, but that previously wasn't configured in rust. This only adds support for the simulator architectures, and arm64 device architecture, not the older 32 bit architectures.
Add `kernel-address` sanitizer support for freestanding targets
This PR adds support for KASan (kernel address sanitizer) instrumentation in freestanding targets. I included the minimal set of `x86_64-unknown-none`, `riscv64{imac, gc}-unknown-none-elf`, and `aarch64-unknown-none` but there's likely other targets it can be added to. (`linux_kernel_base.rs`?) KASan uses the address sanitizer attributes but has the `CompileKernel` parameter set to `true` in the pass creation.
See
https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer/topic/False.20error.20report.20for.20.60rust-analyzer.28private-field.29.60
for further discussion; previously this had various bugs.
I tested go-to-definition on:
- `use std::io::Write` in `src/bootstrap/setup.rs`
- `use std::cell::RefCell` in `src/librustdoc/core.rs`
- `use rustc_span::symbol::sym` in `src/librustdoc/core.rs`
- `use std::fmt` in `compiler/rustc_span/src/symbol.rs`
- `Global` in `library/alloc/src/alloc/tests.rs`
The following things still don't work:
- `Global.deallocate` in alloc/tests.rs. This function is under
`cfg(not(test))`, so it can't be enabled without disabling RA in
`tests.rs` altogether. I think this might be fixable by moving
`library/alloc/src/alloc/tests.rs` to
`library/alloc/tests/alloc/lib.rs`, so it's in a different crate, but
I'd like to avoid blocking this improvement on that change.
This patch adds a few tests to assert the current behavior when passing
data across an await point. This will help to test out an upcoming fix
for the issue of arguments in async functions growing in size because of
the generator upvar that is generated when we desugar the async
function.
See https://github.com/rust-lang/rust/issues/62958
Also relates to https://github.com/rust-lang/rust/pull/107500
Co-authored-by: Ralf Jung <post@ralfj.de>
Enable instcombine for mutable reborrows
`instcombine` used to contain this comment, which is no longer accurate because there it is fine to copy `&mut _` in MIR:
```rust
// The dereferenced place must have type `&_`, so that we don't copy `&mut _`.
```
So let's try replacing that check with something much more permissive...
