Migrate rustc_mir_build diagnostics
Rebases https://github.com/rust-lang/rust/pull/100854
~~The remaining issue is how to better resolve 72bea68af4~~
~~The diagnostic macros seems to generate a broken diagnostic, and I couldn't figure out how to manually format the fluent message, so I hardcoded the format string for now. I'd like pointers to a better fix for this.~~
Also, I'm not 100% sure I didn't mess up a rebase somewhere 🙂
r? `@davidtwco`
Support call and drop terminators in custom mir
The only caveat with this change is that cleanup blocks are not supported. I would like to add them, but it's not quite clear to me what the best way to do that is, so I'll have to think about it some more.
r? ``@oli-obk``
Don't copy symbols from dylibs with `-Zdylib-lto`
When `rustc_driver` started being built with `-Zdylib-lto -Clto=thin`, some libstd symbols were copied by the LTO process into the dylib. That causes duplicate local symbols that are not present otherwise.
Depending on the situation (lib loading order apparently), the duplicated symbols could cause issues: `rustc_driver` overrode the panic hook, but it didn't apply to rustc main's hook (the default from libstd). This is the cause of #105637, in some situations the panic hook installed by `rustc_driver` isn't executed, and only libstd's backtrace is shown (and a double panic). The query stack, as well as the various notes to open a GH about the ICE, don't appear.
It's not clear exactly what is needed to trigger the issue, but I have simulated a reproducer [here](https://github.com/lqd/issue-105637) with cargo involved, the incorrect panic hook is executed on my machine. It is hard to reproduce in a unit test: `cargo run` + `rustup` involves LD_LIBRARY_PATH, which is not the case for `compiletest`. cargo also adds unconditional flags that are then overridden in [`bootstrap` when building rustc with `rust.lto = thin`](9c07efe84f/src/bootstrap/compile.rs (L702-L714)) as done on CI).
All this to say the compilation and execution environment in `bootstrap` leading to the bug building `rustc_driver` is different from our UI tests, and I believe one of the reasons it's hard to make an exact reproducer test. Thankfully there's _still_ a difference in the behavior though: although in the unit test the correct panic hook seems to be executed compared to my repro and the current nightly, only the fix removes the double panic here.
The `7e8277aefa12f1469fb1df01418ff5846a7854a9` `try` build:
- fixes the reproducer repo linked above
- restores the ICE messages from https://github.com/rust-lang/rust/issues/105321 back to the state in its OP compared to the description in https://github.com/rust-lang/rust/issues/105637
- restores the ICE message and the query stack from https://github.com/rust-lang/rust/issues/105777 compared to nightly
While I believe this technically fixes the P-critical issue https://github.com/rust-lang/rust/issues/105637, I would not want to close it yet as we may want to backport to beta/stable (if a point release happens, it would fix the ICEs reported on 1.66.0, which is built with ThinLTO on linux). Once this PR lands, I'll also open another PR to re-enable ThinLTO on x64 darwin's dist builder.
Rollup of 6 pull requests
Successful merges:
- #105493 (Help rust-analyzer normalize query return types)
- #105710 (Don't bug if we're trying to cast `dyn*` to another type)
- #105711 (bail in `collect_trait_impl_trait_tys` if signatures reference errors)
- #105768 (Detect inherent associated types not having CamelCase)
- #105780 (rustdoc: Don't add "Read more" link if there is no extra content)
- #105802 (Make enum-match.rs test robust against variable name changes)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Stabilize default_alloc_error_handler
Tracking issue: #66741
This turns `feature(default_alloc_error_handler)` on by default, which causes the compiler to automatically generate a default OOM handler which panics if `#[alloc_error_handler]` is not provided.
The FCP completed over 2 years ago but the stabilization was blocked due to an issue with unwinding. This was fixed by #88098 so stabilization can be unblocked.
Closes#66741
Rewrite `E0158` error-code docs for clarity
Fixes#105585.
The `E0158` error-code docs are unclear. It doesn't explain all three different variants of the error and doesn't explain *why* the error occurs. This PR cleans it up a bit and brings it properly into line with [RFC1567](https://rust-lang.github.io/rfcs/1567-long-error-codes-explanation-normalization.html).
I'm a first time Rust contributor so I've probably not got it quite right. I also haven't run the whole build process because I assume that my minor docs changes shouldn't break everything.
always use `anonymize_bound_vars`
Unless this is perf-sensitive, it's probably best to always use one anonymize function that does the right thing for all bound vars.
r? types
Move `TypeckResults` to separate module
`ty::context` is really big and the typeck results aren't directly related to `TyCtxt`, so move them to a separate module. Also contains a small drive-by macro "improvement".
Custom MIR: Many more improvements
Commits are each atomic changes, best reviewed one at a time, with the exception that the last commit includes all the documentation.
### First commit
Unsafetyck was not correctly disabled before for `dialect = "built"` custom MIR. This is fixed and a regression test is added.
### Second commit
Implements `Discriminant`, `SetDiscriminant`, and `SwitchInt`.
### Third commit
Implements indexing, field, and variant projections.
### Fourth commit
Documents the previous commits and everything else.
There is some amount of weirdness here due to having to beat Rust syntax into cooperating with MIR concepts, but it hopefully should not be too much. All of it is documented.
r? `@oli-obk`
always check alignment during CTFE
We originally disabled alignment checks because they got in the way -- there are some things we do with the interpreter during CTFE which does not correspond to actually running user-written code, but is purely administrative, and we didn't want alignment checks there, so we just disabled them entirely. But with `-Zextra-const-ub-checks` we anyway had to figure out how to disable those alignment checks while doing checks in regular code. So now it is easy to enable CTFE alignment checking by default. Let's see what the perf consequences of that are.
r? `@oli-obk`
Various cleanups to dest prop
This makes fixing the issues identified in #105577 easier. A couple changes
- Use an enum with names instead of a bool
- Only call `remove_candidates_if` from one place instead of two. Doing it from two places is far too fragile, since any divergence in the behavior between those callsites is likely to be unsound.
- Remove `is_constant`. Right now we only merge locals, so this doesn't do anything, and the logic would be wrong if it did.
r? `@tmiasko`
Auto traits in `dyn Trait + Auto` are suggestable
Not sure why I had made the `IsSuggestableVisitor` have that rule to not consider `dyn Trait + Auto` to be suggestable.
It's possible that this was done because of the fact that we don't print the right parentheses for `&(dyn Trait + Auto)`, but that's a problem with printing these types in general that we probably have tracked somewhere else...
Ensure async trait impls are async (or otherwise return an opaque type)
As a workaround for the full `#[refine]` semantics not being implemented
yet, forbit returning a concrete future type like `Box<dyn Future>` or a
manually implemented Future.
`-> impl Future` is still permitted; while that can also cause
accidental refinement, that's behind a different feature gate
(`return_position_impl_trait_in_trait`) and that problem exists
regardless of whether the trait method is async, so will have to be
solved more generally.
Fixes https://github.com/rust-lang/rust/issues/102745
Highlight conflicting param-env candidates, again
Un-reverts #98794 (i.e. reverts #99290).
The previous time I attempted to land this PR, it was because of an incremental issue (#99233). The repro instructions in the issue is no longer manifest the ICE -- I think it's because this ambiguity code was refactored (I think by `@lcnr)` to no longer store the ambiguities in the fulfillment error, but instead recompute them on the fly.
The main motivation for trying to re-land this is that it fixes#105131 by highlighting the root-cause of the issue, which is conflicting param-env candidates:
```
error[E0283]: type annotations needed: cannot satisfy `Self: Gen<'source>`
|
note: multiple `impl`s or `where` clauses satisfying `Self: Gen<'source>` found
--> $DIR/conflicting-bounds.rs:3:1
|
LL | pub trait Gen<'source> {
| ^^^^^^^^^^^^^^^^^^^^^^
...
LL | Self: for<'s> Gen<'s, Output = T>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0283`.
```
Fixes#105131.
Fixes (again) #98786
Sync rustc_codegen_cranelift
This time there are a bunch of bugfixes, some new llvm intrinsic implementations and refactorings to the build system in preparation for running cg_clif tests as part of `./x.py test`.
r? `@ghost`
`@rustbot` label +A-codegen +A-cranelift +T-compiler
As a workaround for the full `#[refine]` semantics not being implemented
yet, forbit returning a concrete future type like `Box<dyn Future>` or a
manually implemented Future.
`-> impl Future` is still permitted; while that can also cause
accidental refinement, that's behind a different feature gate
(`return_position_impl_trait_in_trait`) and that problem exists
regardless of whether the trait method is async, so will have to be
solved more generally.
Fixes#102745
fold instead of obliterating args
Fixes#105608
we call `const_eval_resolve` on the following constant:
```
def: playground::{impl#0}::and::{constant#0},
substs: [
ConstKind::Unevaluated {
def: playground::{impl#0}::and::{constant#0},
substs: [
ConstKind::Value(0x0),
_,
]
}
_,
],
```
when expanded out to `ConstKind::Expr` there are no infer vars so we attempt to evaluate it after replacing infer vars with garbage, however the current logic for replacing with garbage replaces _the whole arg containing the infer var_ rather than just the infer var. This means that after garbage replacement has occured we attempt to evaluate:
```
def: playground::{impl#0}::and::{constant#0},
substs: [
PLACEHOLDER,
PLACEHOLDER,
],
```
Which then leads to ctfe being unable to evaluate the const. With this PR we attempt to evaluate:
```
def: playground::{impl#0}::and::{constant#0},
substs: [
ConstKind::Unevaluated {
def: playground::{impl#0}::and::{constant#0},
substs: [
ConstKind::Value(0x0),
PLACEHOLDER,
]
}
PLACEHOLDER,
],
```
which ctfe _can_ handle.
I am not entirely sure why this function is supposed to replace params with placeholders rather than just inference vars 🤔
Illegal sized bounds: only suggest mutability change if needed
In a scenario like
```rust
struct Type;
pub trait Trait {
fn function(&mut self)
where
Self: Sized;
}
impl Trait for Type {
fn function(&mut self) {}
}
fn main() {
(&mut Type as &mut dyn Trait).function();
}
```
the problem is Sized, not the mutability of self. Thus don't emit the "you need &T instead of &mut T" note, or the other way around, as all it does is just invert the mutability of whatever was supplied.
Fixes#103622.
Refine when invalid prefix case error arises
Fix cases where the "invalid base prefix for number literal" error arises with suffixes that look erroneously capitalized but which are actually invalid.
Combine `ty::Projection` and `ty::Opaque` into `ty::Alias`
Implements https://github.com/rust-lang/types-team/issues/79.
This PR consolidates `ty::Projection` and `ty::Opaque` into a single `ty::Alias`, with an `AliasKind` and `AliasTy` type (renamed from `ty::ProjectionTy`, which is the inner data of `ty::Projection`) defined as so:
```
enum AliasKind {
Projection,
Opaque,
}
struct AliasTy<'tcx> {
def_id: DefId,
substs: SubstsRef<'tcx>,
}
```
Since we don't have access to `TyCtxt` in type flags computation, and because repeatedly calling `DefKind` on the def-id is expensive, these two types are distinguished with `ty::AliasKind`, conveniently glob-imported into `ty::{Projection, Opaque}`. For example:
```diff
match ty.kind() {
- ty::Opaque(..) =>
+ ty::Alias(ty::Opaque, ..) => {}
_ => {}
}
```
This PR also consolidates match arms that treated `ty::Opaque` and `ty::Projection` identically.
r? `@ghost`
Rollup of 7 pull requests
Successful merges:
- #105147 (Allow unsafe through inline const)
- #105438 (Move some codegen-y methods from `rustc_hir_analysis::collect` -> `rustc_codegen_ssa`)
- #105464 (Support #[track_caller] on async closures)
- #105476 (Change pattern borrowing suggestions to be verbose and remove invalid suggestion)
- #105500 (Make some diagnostics not depend on the source of what they reference being available)
- #105628 (Small doc fixes)
- #105659 (Don't require owned data in `MaybeStorageLive`)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Don't require owned data in `MaybeStorageLive`
Small improvement that avoids a clone. I don't expect this to have any noticeable perf effects, but better to have it than not to.
r? ``@tmiasko``
Change pattern borrowing suggestions to be verbose and remove invalid suggestion
Synthesize a more accurate span and use verbose suggestion output to
make the message clearer.
Do not suggest borrowing binding in pattern in let else. Fix#104838.
Move some codegen-y methods from `rustc_hir_analysis::collect` -> `rustc_codegen_ssa`
Unclear if they should live here, but they seem codegen-y enough, and `rustc_hir_analysis::collect` is extremely long, so it should probably lose some methods.
Allow unsafe through inline const
Handle similar to closures.
Address https://github.com/rust-lang/rust/pull/104087#issuecomment-1324173328
Note that this PR does not fix the issue for `unsafe { [0; function_requiring_unsafe()] }`. This is fundamentally unfixable for MIR unsafeck IMO.
This PR also does not fix unsafety checking for inline const in pattern position. It actually breaks it, allowing unsafe functions to be used in inline const in pattern position without unsafe blocks. Inline const in pattern position is not visible in MIR so ignored by MIR unsafety checking (currently it is also not checked by borrow checker, which is the reason why it's considered an incomplete feature).
`@rustbot` label: +T-lang +F-inline_const
Simpler diagnostic when passing arg to closure and missing borrow
fixes#64915
I followed roughly the instructions and the older PR #76362.
The number of references for the expected and the found types will be compared and depending on which has more the diagnostic will be emitted.
I'm not quite sure if my approach with the many `span_bug!`s is good, it could lead to some ICEs. Would it be better if those errors are ignored?
As far as I know the following code works similarly but in a different context. Is this probably reusable since it looks like it would emit better diagnostics?
a688a0305f/compiler/rustc_hir_analysis/src/check/demand.rs (L713-L1061)
When running the tests locally, a codegen test failed. Is there something I can/ should do about that?
If you have some improvements/ corrections please say so and I will happily include them.
r? `@estebank` (as you added the mentoring instructions to the issue)
Remove previously existing fallback that tried to give a good turbofish
suggestion, `need_type_info` is already good enough.
Special case `::<Vec<_>` suggestion for `Iterator::collect`.
use ty::Binder in rustdoc instead of `skip_binder`
r? `@GuillaumeGomez`
this is a preliminary cleanup required to be able to normalize correctly/conveniently in rustdoc
