Reorder check_item_type diagnostics so they occur next to the corresponding `check_well_formed` diagnostics
The first commit is just a cleanup.
The second commit moves most checks from `check_mod_item_types` into `check_well_formed`, invoking the checks in lockstep per-item instead of iterating over all items twice.
Rollup of 10 pull requests
Successful merges:
- #118521 (Enable address sanitizer for MSVC targets using INFERASANLIBS linker flag)
- #119026 (std::net::bind using -1 for openbsd which in turn sets it to somaxconn.)
- #119195 (Make named_asm_labels lint not trigger on unicode and trigger on format args)
- #119204 (macro_rules: Less hacky heuristic for using `tt` metavariable spans)
- #119362 (Make `derive(Trait)` suggestion more accurate)
- #119397 (Recover parentheses in range patterns)
- #119417 (Uplift some miscellaneous coroutine-specific machinery into `check_closure`)
- #119539 (Fix typos)
- #119540 (Don't synthesize host effect args inside trait object types)
- #119555 (Add codegen test for RVO on MaybeUninit)
r? `@ghost`
`@rustbot` modify labels: rollup
Make offset_of field parsing use metavariable which handles any spacing
As discussed at and around comments https://github.com/rust-lang/rust/issues/106655#issuecomment-1793485081 and https://github.com/rust-lang/rust/issues/106655#issuecomment-1793774183, the current arguments to offset_of do not accept all the whitespace combinations: `0. 1.1.1` and `0.1.1. 1` are currently treated specially in `tests/ui/offset-of/offset-of-tuple-nested.rs`.
They also do not allow [forwarding individual fields as in](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=444cdf0ec02b99e8fd5fd8d8ecb312ca)
```rust
macro_rules! off {
($a:expr) => {
offset_of!(m::S, 0. $a)
}
}
```
This PR replaces the macro arguments with `($Container:ty, $($fields:expr)+ $(,)?)` which does allow any arrangement of whitespace that I could come up with and the forwarding of fields example above.
This also allows for array indexing in the future, which I think is the last future extension to the syntax suggested in the offset_of RFC.
Tracking issue for offset_of: #106655
``@rustbot`` label F-offset_of
``@est31``
Support reg_addr register class in s390x inline assembly
In s390x, `r0` cannot be used as an address register (it is evaluated as zero in an address context).
Therefore, currently, in assemblies involving memory accesses, `r0` must be [marked as clobbered](1a1155653a/src/arch/s390x.rs (L58)) or [explicitly used to a non-address](1a1155653a/src/arch/s390x.rs (L135)) or explicitly use an address register to prevent `r0` from being allocated to a register for the address.
This patch adds a register class for allocating general-purpose registers, except `r0`, to make it easier to use address registers. (powerpc already has a register class (reg_nonzero) for a similar purpose.)
This is identical to the `a` constraint in LLVM and GCC:
https://llvm.org/docs/LangRef.html#supported-constraint-code-list
> a: A 32, 64, or 128-bit integer address register (excludes R0, which in an address context evaluates as zero).
https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html
> a
> Address register (general purpose register except r0)
cc ``@uweigand``
r? ``@Amanieu``
custom mir: make it clear what the return block is
Custom MIR recently got support for specifying the "unwind action", so now there's two things coming after the actual call part of `Call` terminators. That's not very self-explaining so I propose we change the syntax to imitate keyword arguments:
```
Call(popped = Vec::pop(v), ReturnTo(drop), UnwindContinue())
```
Also fix some outdated docs and add some docs to `Call` and `Drop`.
Don't synthesize host effect args inside trait object types
While we were indeed emitting an error for `~const` & `const` trait bounds in trait object types, we were still synthesizing host effect args for them.
Since we don't record the original trait bound modifiers for dyn-Trait in `hir::TyKind::TraitObject` (unlike we do for let's say impl-Trait, `hir::TyKind::OpaqueTy`), AstConv just assumes `ty::BoundConstness::NotConst` in `conv_object_ty_poly_trait_ref` which given `<host> dyn ~const NonConstTrait` resulted in us not realizing that `~const` was used on a non-const trait which lead to a failed assertion in the end.
Instead of updating `hir::TyKind::TraitObject` to track this kind of information, just strip the user-provided constness (similar to #119505).
Fixes#119524.
Uplift some miscellaneous coroutine-specific machinery into `check_closure`
This PR uplifts some of the logic in `check_fn` that is specific to checking coroutines, which always flows through `check_closure`.
This is just some miscellaneous clean up that I've wanted to do, especially because I'm poking around this code to make it work for async closures.
Recover parentheses in range patterns
Before:
```rs
match n {
(0).. => (),
_ => ()
}
```
```
error: expected one of `=>`, `if`, or `|`, found `..`
--> src/lib.rs:3:12
|
3 | (0).. => (),
| ^^ expected one of `=>`, `if`, or `|`
```
After:
```
error: range pattern bounds cannot have parentheses
--> main.rs:3:5
|
3 | (0).. => (),
| ^ ^
|
help: remove these parentheses
|
3 - (0).. => (),
3 + 0.. => (),
|
```
This sets the groundwork for #118625, which will extend the recovery to expressions like `(0 + 1)..` where users may tend to add parentheses to avoid dealing with precedence.
---
```@rustbot``` label +A-parser +A-patterns +A-diagnostics
Make `derive(Trait)` suggestion more accurate
Only suggest `derive(PartialEq)` when both LHS and RHS types are the same, otherwise the suggestion is not useful.
macro_rules: Less hacky heuristic for using `tt` metavariable spans
See the big comment on `fn maybe_use_metavar_location` for a more detailed description.
Make named_asm_labels lint not trigger on unicode and trigger on format args
Someone showed me some cursed code that used format args to create named labels, and rustc wasn't linting on that. Additionally while fixing that, I noticed that Unicode alphabetic characters were being used as part of labels, when they are not actually permitted in labels.
r? ```@Amanieu```
Fix: Properly set vendor in i686-win7-windows-msvc target
In #118150 , setting the `vendor` field of the `i686-win7-windows-msvc` target was forgotten, preventing us from easily checking the target using `cfg(target_vendor)`.
With this PR, we set the target vendor to "win7".
coverage: Avoid a query stability hazard in `function_coverage_map`
When #118865 started enforcing the `rustc::potential_query_instability` lint in `rustc_codegen_llvm`, it added an exemption for this site, arguing that the entries are only used to create a list of filenames that is later sorted.
However, the list of entries also gets traversed when creating the function coverage records in LLVM IR, which may be sensitive to hash-based ordering.
This patch therefore changes `function_coverage_map` to use `FxIndexMap`, which should avoid hash-based instability by iterating in insertion order.
cc ``@Enselic``
Report I/O errors from rmeta encoding with emit_fatal
https://github.com/rust-lang/rust/issues/119456 reminded me that I never did systematic testing to provoke the out-of-disk ICEs so I grepped through a recent crater run (https://github.com/rust-lang/rust/pull/119440#issuecomment-1873393963) for more out-of-disk ICEs on current master and yep there's 2 in there.
So I finally cooked up a way to provoke for these crashes. I wrote a little `cdylib` crate that has a `#[no_mangle] pub extern "C" fn write` which occasionally reports `ENOSPC`, and prints a backtrace when it does.
<details><summary><strong>code for the dylib</strong></summary>
<p>
```rust
// cargo add libc rand backtrace
use rand::Rng;
#[no_mangle]
pub extern "C" fn write(
fd: libc::c_int,
buf: *const libc::c_void,
count: libc::size_t,
) -> libc::ssize_t {
if fd > 2 && rand::thread_rng().gen::<u8>() == 0 {
let mut count = 0;
backtrace::trace(|frame| {
backtrace::resolve_frame(frame, |symbol| {
if let Some(name) = symbol.name() {
if count > 3 {
eprintln!("{}", name);
}
}
count += 1;
});
true
});
unsafe {
*libc::__errno_location() = libc::ENOSPC;
}
return -1;
} else {
unsafe {
let res =
libc::syscall(libc::SYS_write, fd as usize, buf as usize, count as usize) as isize;
if res < 0 {
*libc::__errno_location() = -res as i32;
-1
} else {
res
}
}
}
}
```
</p>
</details>
Then `LD_PRELOAD` that dylib and repeatedly build a big project until it ICEs, such as with this:
```bash
while true; do
cargo clean
LD_PRELOAD=/home/ben/evil/target/release/libevil.so cargo +stage1 check 2> errors
if grep "thread 'rustc' panicked" errors; then
break
fi
done
```
My "big project" for testing was an otherwise-empty project with `cargo add axum`.
Before this PR, the above procedure finds a crash in between 1 and 15 minutes. With this PR, I have not found a crash in 30 minutes, and I'll be leaving this to run overnight (starting now). (A night has now passed, no crashes were found)
I believe the problem is that even though since https://github.com/rust-lang/rust/pull/117301 we correctly check `FileEncoder` for errors on all paths, we use `emit_err`, so there is a window of time between the call to `emit_err` and the full error reporting where rustc believes it has emitted a valid rmeta file and will permit Cargo to launch a build for a dependent crate. Changing these calls to `emit_fatal` closes that window.
I think there are a number of other cases where `emit_err` has been used instead of the more-correct `emit_fatal` such as e51e98dde6/compiler/rustc_codegen_ssa/src/back/write.rs (L542) but unlike rmeta encoding I am not aware of those cases of those causing problems.
r? ``@WaffleLapkin``
Update tracking issue of naked_functions
The original tracking issue #32408 was superseded by the new one #90957 (constrainted naked functions) and therefore is closed.
Query panic!() to useful diagnostic
Changes some more ICEs from bare panic!()s
Adds an `expect_job()` helper method as that is a moral equivalent of what was happening at the uses.
re:#118955
