Subtree sync for rustc_codegen_cranelift
The main highlight this time is a bunch of new vendor intrinsics. Cranelift has also been updated to 0.105. And there were a bunch of big-endian fixes.
r? `@ghost`
`@rustbot` label +A-codegen +A-cranelift +T-compiler
Rollup of 9 pull requests
Successful merges:
- #121201 (align_offset, align_to: no longer allow implementations to spuriously fail to align)
- #122076 (Tweak the way we protect in-place function arguments in interpreters)
- #122100 (Better comment for implicit captures in RPITIT)
- #122157 (Add the new description field to Target::to_json, and add descriptions for some MSVC targets)
- #122164 (Fix misaligned loads when loading UEFI arg pointers)
- #122171 (Add some new solver tests)
- #122172 (Don't ICE if we collect no RPITITs unless there are no unification errors)
- #122197 (inspect formatter: add braces)
- #122198 (Remove handling for previously dropped LLVM version)
r? `@ghost`
`@rustbot` modify labels: rollup
Don't ICE if we collect no RPITITs unless there are no unification errors
Move an assertion in `collect_return_position_impl_trait_in_trait_tys` to after the `ObligationCtxt::eq` calls, so that we only assert and ICE if we have unification errors.
Fixes#121468
Fix misaligned loads when loading UEFI arg pointers
Currently, the two UEFI argument pointers are stored in an `alloca` of alignment 1, a pointer to which is then passed as `argv`. However, [the library code](9c3ad802d9/library/std/src/sys/pal/uefi/mod.rs (L60-L61)) treats `argv` as a pointer to an array of pointers and dereferences it as such, meaning that it presumes the `alloca` is aligned to at least the alignment of a pointer. This PR fixes this mismatch by aligning the `alloca` to the alignment of a pointer.
This PR also changed the `gep` to use the new `inbounds_ptradd` method.
Add the new description field to Target::to_json, and add descriptions for some MSVC targets
The original PR to add a `description` field to `Target` (<https://github.com/rust-lang/rust/pull/121905>) didn't add the field to `Target::to_json`, which meant that the `check_consistency` testwould fail if you tried to set a description as it wouldn't survive round-tripping via JSON: https://github.com/rust-lang/rust/actions/runs/8180997936/job/22370052535#step:27:4967
This change adds the field to `Target::to_json`, and sets some descriptions to verify that it works correctly.
Tweak the way we protect in-place function arguments in interpreters
Use `MPlaceTy` instead of `PlaceTy` in `FnArg` and ignore (copy) locals in an earlier step ("Locals that don't have their address taken are as protected as they can ever be").
This seems to be crucial for tail call support (as they can't refer to caller's locals which are killed when replacing the stack frame).
r? `@RalfJung`
cc `@oli-obk`
see https://github.com/rust-lang/rust/pull/121273#issuecomment-1980210690
align_offset, align_to: no longer allow implementations to spuriously fail to align
For a long time, we have allowed `align_offset` to fail to compute a properly aligned offset, and `align_to` to return a smaller-than-maximal "middle slice". This was done to cover the implementation of `align_offset` in const-eval and Miri. See https://github.com/rust-lang/rust/issues/62420 for more background. For about the same amount of time, this has caused confusion and surprise, where people didn't realize they have to write their code to be defensive against `align_offset` failures.
Another way to put this is: the specification is effectively non-deterministic, and non-determinism is hard to test for -- in particular if the implementation everyone uses to test always produces the same reliable result, and nobody expects it to be non-deterministic to begin with.
With https://github.com/rust-lang/rust/pull/117840, Miri has stopped making use of this liberty in the spec; it now always behaves like rustc. That only leaves const-eval as potential motivation for this behavior. I do not think this is sufficient motivation. Currently, none of the relevant functions are stably const: `align_offset` is unstably const, `align_to` is not const at all. I propose that if we ever want to make these const-stable, we just accept the fact that they can behave differently at compile-time vs at run-time. This is not the end of the world, and it seems to be much less surprising to programmers than unexpected non-determinism. (Related: https://github.com/rust-lang/rfcs/pull/3352.)
`@thomcc` has repeatedly made it clear that they strongly dislike the non-determinism in align_offset, so I expect they will support this. `@oli-obk,` what do you think? Also, whom else should we involve? The primary team responsible is clearly libs-api, so I will nominate this for them. However, allowing const-evaluated code to behave different from run-time code is t-lang territory. The thing is, this is not stabilizing anything t-lang-worthy immediately, but it still does make a decision we will be bound to: if we accept this change, then
- either `align_offset`/`align_to` can never be called in const fn,
- or we allow compile-time behavior to differ from run-time behavior.
So I will nominate for t-lang as well, with the question being: are you okay with accepting either of these outcomes (without committing to which one, just accepting that it has to be one of them)? This closes the door to "have `align_offset` and `align_to` at compile-time and also always have compile-time behavior match run-time behavior".
Closes https://github.com/rust-lang/rust/issues/62420
Merge `collect_mod_item_types` query into `check_well_formed`
follow-up to https://github.com/rust-lang/rust/pull/121154
this removes more potential parallel-compiler bottlenecks and moves diagnostics for the same items next to each other, instead of grouping diagnostics by analysis kind
Use `MPlaceTy` instead of `PlaceTy` in `FnArg` and ignore (copy) locals in an
earlier step ("Locals that don't have their address taken are as protected as
they can ever be").
This seems to be crucial for tail call support (as they can't refer to caller's
locals which are killed when replacing the stack frame).
Use `ControlFlow` in visitors.
Follow up to #121256
This does have a few small behaviour changes in some diagnostic output where the visitor will now find the first match rather than the last match. The change in `find_anon_types.rs` has the only affected test. I don't see this being an issue as the last occurrence isn't any better of a choice than the first.
Refactor pre-getopts command line argument handling
Rebased version of #111658. I've also fixed the Windows CI failure (although I don't have access to Windows to test it myself).
add known-bug tests for derive failure to detect packed repr
We only taint if it was a normal item. Modules and imports are untouched. Tainting them needs to be done differently, and it's unclear if that would be useful or desirable. If we just taint them into `Res::Err`, we end up losing some duplicate name messages *in the presence of other resolution errors*.
r? `@petrochenkov`
