Delete `SimplifyArmIdentity` and `SimplifyBranchSame` mir opts
I had attempted to fix the first of these opts in #94177 . However, despite that PR already being a full re-write, it still did not fix some of the core soundness issues. The optimizations that are attempted here are likely to be desirable, but I do not expect any of the currently written code to survive into a sound implementation. Deleting the code keeps us from having to maintain the passes in the meantime.
Closes#77359 , closes#72800 , closes#78628
r? ```@cjgillot```
Add hint for missing lifetime bound on trait object when type alias is used
Fix issue #103582.
The problem: When a type alias is used to specify the return type of the method in a trait impl, the suggestion for fixing the problem of "missing lifetime bound on trait object" of the trait impl will not be created. The issue caused by the code which searches for the return trait objects when constructing the hint suggestion is not able to find the trait objects since they are specified in the type alias path instead of the return path of the trait impl.
The solution: Trace the trait objects in the type alias path and provide them along with the alias span to generate the suggestion in case the type alias is used in return type of the method in the trait impl.
use `LocalDefId` instead of `HirId` in trait resolution to simplify the obligation clause resolution
This commit introduces a refactoring suggested by `@lcnr` to simplify the obligation clause resolution.
This is just the first PR that introduces a type of refactoring, but others PRs will follow this to introduce name changing to change from the variable name from `body_id` to something else.
Fixes https://github.com/rust-lang/rust/issues/104827
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
`@rustbot` r? `@lcnr`
Add suggestion to remove if in let..else block
Adds an additional hint to failures where we encounter an else keyword while we're parsing an if-let expression.
This is likely that the user has accidentally mixed if-let and let..else together.
Fixes#103791.
rustc_metadata: Support non-`Option` nullable values in metadata tables
This is a convenience feature for cases in which "no value in the table" and "default value in the table" are equivalent.
Tables using `Table<DefIndex, ()>` are migrated in this PR, some other cases can be migrated later.
This helps `DocFlags` in https://github.com/rust-lang/rust/pull/107136 in particular.
Allow setting CFG_DISABLE_UNSTABLE_FEATURES to 0
Two locations check whether this build-time environment variable is defined. Allowing it to be explicitly disabled with a "0" value is useful, especially for integrating with external build systems.
This function didn't do what the authors intended it to do.
- Due to `move` in the closure `is_public` wasn't captured by mutalbe reference and wasn't used as a cache.
- Due to iterator cloning all the `should_encode_attr` logic run for the second time to calculate `may_have_doc_links`
This PR fixes these issues, and calculates all the needed attribute flags in one go.
Atomic operations for different widths (8-bit, 16-bit, 32-bit etc.) are
guarded by `target_has_atomic = "value"` symbol (i.e. `target_has_atomic
= "8"`) (and the other derivatives), but before this change, there was
no width-agnostic symbol indicating a general availability of atomic
operations.
This change introduces:
* `target_has_atomic_load_store` symbol when atomics for any integer
width are supported by the target.
* `target_has_atomic` symbol when also CAS is supported.
Fixes#106845
Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>
- On compiler-error's suggestion of moving this lower down the stack,
along the path of `report_mismatched_types()`, which is used
by `rustc_hir_analysis` and `rustc_hir_typeck`.
- update ui tests, add test
- add suggestions for references to fn pointers
- modify `TypeErrCtxt::same_type_modulo_infer` to take `T: relate::Relate` instead of `Ty`
Adds an additional hint to failures where we encounter an else keyword
while we're parsing an if-let block.
This is likely that the user has accidentally mixed if-let and let...else
together.
This is a convenience feature for cases in which "no value in the table" and "default value in the table" are equivalent.
Tables using `Table<DefIndex, ()>` are migrated in this PR, some other cases can be migrated later.
This helps `DocFlags` in https://github.com/rust-lang/rust/pull/107136 in particular.
use LocalDefId instead of HirId in trait resolution to simplify
the obligation clause resolution
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Consistently use dominates instead of is_dominated_by
There is a number of APIs that answer dominance queries. Previously they were named either "dominates" or "is_dominated_by". Consistently use the "dominates" form.
No functional changes.
Instantiate dominators algorithm only once
Remove inline from BasicBlocks::dominators to instantiate the dominator algorithm only once - in the rustc_middle crate.
remove error code from `E0789`, add UI test/docs
`E0789` shouldn't have an error code, it's explicitly internal-only and is tiny in scope. (I wonder if we can tighten the standard for this in the RFC?) I also added a UI test and error docs (done like `E0208`, they are "no longer emitted").
r? `@GuillaumeGomez` (shouldn't need a compiler review, it's pretty minor)
BPF: Disable atomic CAS
Enabling CAS for BPF targets (https://github.com/rust-lang/rust/pull/105708) breaks the build of core library.
The failure occurs both when building rustc for BPF targets and when
building crates for BPF targets with the current nightly.
The LLVM BPF backend does not correctly lower all `atomicrmw` operations
and crashes for unsupported ones.
Before we can enable CAS for BPF in Rust, we need to fix the LLVM BPF
backend first.
Fixes#106795
Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>
rustc_metadata: Encode `doc(hidden)` flag to metadata
To retrieve these flags rustdoc currently has to mass decode full attributes for items in the whole crate tree, so it's better to pre-compute it in advance.
This is especially important for short-term performance of https://github.com/rust-lang/rust/pull/107054 because resolver cannot use memoization of query results yet.
Consider doc(alias) when providing typo suggestions
This means that
```rust
impl Foo {
#[doc(alias = "quux")]
fn bar(&self) {}
}
fn main() {
(Foo {}).quux();
}
```
will suggest `bar`. This currently uses the "there is a method with a similar name" help text, because the point where we choose and emit a suggestion is different from where we gather the suggestions. Changes have mainly been made to the latter.
The selection code will now fall back to aliased candidates, but generally only if there is no candidate that matches based on the existing Levenshtein methodology.
Fixes#83968.
...and remove it from `PointeeInfo`, which isn't meant for this.
There are still various places (marked with FIXMEs) that assume all pointers
have the same size and alignment. Fixing this requires parsing non-default
address spaces in the data layout string, which will be done in a followup.
there were fixmes for this already
i am about to remove is_ptr (since callers need to properly distinguish
between pointers in different address spaces), so might as well do this
at the same time
This means that
```rust
impl Foo {
#[doc(alias = "quux")]
fn bar(&self) {}
}
fn main() {
(Foo {}).quux();
}
```
will suggest `bar`. This currently uses the "there is a method with a
similar name" help text, because the point where we choose and emit a
suggestion is different from where we gather the suggestions. Changes
have mainly been made to the latter.
The selection code will now fall back to aliased candidates, but
generally only if there is no candidate that matches based on the
existing Levenshtein methodology.
Fixes#83968.
Enable sanitizers for s390x-linux
Include sanitizers supported by LLVM on s390x (asan, lsan, msan, tsan) in the target definition, as well as in the compiletest supported list.
Build sanitizer runtime for the target. Enable sanitizers in the CI.
Implement some more predicates in the new solver
Implement a few more goals. The subtype goal specifically is important, since it's required for this code to compile:
```
fn main() {
let mut x = vec![];
x.push(1i32);
}
```
(I think we emit a subtype goal here because of coercion).
Drive-by: Also implements `--compare-mode=next-solver` -- I've been using this locally a lot to find out what works and what doesn't. I'm also happy to split this out into another PR.
r? `@lcnr`
Rollup of 8 pull requests
Successful merges:
- #103418 (Add `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` to future-incompat report)
- #106113 (llvm-wrapper: adapt for LLVM API change)
- #106144 (Improve the documentation of `black_box`)
- #106578 (Label closure captures/generator locals that make opaque types recursive)
- #106749 (Update cc to 1.0.77)
- #106935 (Fix `SingleUseLifetime` ICE)
- #107015 (Re-enable building rust-analyzer on riscv64)
- #107029 (Add new bootstrap members to triagebot.toml)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
llvm-wrapper: adapt for LLVM API change
No functional changes intended.
The LLVM commit e6b02214c6 added `TargetExtTyID` to the `TypeID` enum. This adapts `RustWrapper` accordingly.
Revert "Make PROC_MACRO_DERIVE_RESOLUTION_FALLBACK a hard error"
This reverts commit 7d82cadd97 aka PR #84022
I am doing this to buy us some time with respect to issue #106337 w.r.t. the 1.67 release.
To retrieve these flags rustdoc currently has to mass decode full attributes for items in the whole crate tree, so it's better to pre-compute it in advance.
This is especially for short-term performance of https://github.com/rust-lang/rust/pull/107054 because resolver cannot use memoization of query results yet.
Use UnordMap and UnordSet for id collections (DefIdMap, LocalDefIdMap, etc)
This PR changes the `rustc_data_structures::define_id_collections!` macro to use `UnordMap` and `UnordSet` instead of `FxHashMap` and `FxHashSet`. This should account for a large portion of hash-maps being used in places where they can cause trouble.
The changes required are moderate but non-zero:
- In some places the collections are extracted into sorted vecs.
- There are a few instances where for-loops have been changed to extends.
~~Let's see what the performance impact is. With a bit more refactoring, we might be able to get rid of some of the additional sorting -- but the change set is already big enough. Unless there's a performance impact, I'd like to do further changes in subsequent PRs.~~
Performance does not seem to be negatively affected ([perf-run here](https://github.com/rust-lang/rust/pull/106977#issuecomment-1396776699)).
Part of [MCP 533](https://github.com/rust-lang/compiler-team/issues/533).
r? `@ghost`
There is a number of APIs that answer dominance queries. Previously they
were named either "dominates" or "is_dominated_by". Consistently use the
"dominates" form.
No functional changes.
Implement some more new solver candidates and fix some bugs
First, fix some bugs:
1. `IndexVec::drain_enumerated(a..b)` does not give us an iterator of index keys + items enumerated from `a..b`, but from `0..(b-a)`... That caused a bug. See first commit for the fix.
2. Implement the `_: Trait` ambiguity hack. I put it in assemble, let me know if it should live elsewhere. This is important, since we otherwise consider `_: Sized` to have no solutions, and nothing passes!
3. Swap `Ambiguity` and `Unimplemented` cases for the new solver. Sorry for accidentally swapping them 😄
4. Check GATs' own predicates during projection confirmation.
Then implement a few builtin traits:
5. Implement `PointerSized`. Pretty independent.
6. Implement `Fn` family of traits for fnptr, fndef, and closures. Closures are currently broken because `FulfillCtxt::relationships` is intentionally left unimplemented. See comment in the test.
r? ```@lcnr```
Change `bindings_with_variant_name` to deny-by-default
Changed the `bindings_with_variant_name` lint to deny-by-default and fixed up the affected tests.
Addresses #103442.
Include sanitizers supported by LLVM on s390x (asan, lsan, msan, tsan)
in the target definition, as well as in the compiletest supported list.
Build sanitizer runtime for the target. Enable sanitizers in the CI.
Rollup of 8 pull requests
Successful merges:
- #106783 (Recover labels written as identifiers)
- #106973 (Don't treat closures from other crates as local)
- #106979 (Document how to get the type of a default associated type)
- #107053 (signal update string representation for haiku.)
- #107058 (Recognise double-equals homoglyph)
- #107067 (Custom MIR: Support storage statements)
- #107076 (Added const-generic ui test case for issue #106419)
- #107091 (Fix broken format strings in `infer.ftl`)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
[drop tracking] Visit break expressions
This fixes https://github.com/rust-lang/rust/issues/102383 by remembering to visit the expression in `break expr` when building the drop tracking CFG. Missing this step was causing an off-by-one error which meant after a number of awaits we'd be
looking for dropped values at the wrong point in the code.
Additionally, this changes the order of traversal for assignment expressions to visit the rhs and then the lhs. This matches what is done elsewhere.
Finally, this improves some of the debugging output (for example, the CFG visualizer) to make it easier to figure out these sorts of issues.
Recognise double-equals homoglyph
Recognise `⩵` as a homoglyph for `==`.
The first commit switches `char` to `&str`, as all previous homoglyphs corresponded to a single ASCII character, while the second implements the fix.
`@rustbot` label +A-diagnostics +A-parser
Don't treat closures from other crates as local
fixes#104817
r? `@lcnr`
Specialization can prefer an impl for an opaque type over a blanket impls that also matches. If the blanket impl only applies if an auto-trait applies, we look at the hidden type of the opaque type to see if that implements the auto trait. The hidden type can be a closure or generator, and thus we will end up seeing these types in coherence and have to handle them properly.
Don't wf-check non-local RPITs
We were using `ty::is_impl_trait_defn(..).is_none()` to check if we need to add WF obligations for an opaque type.
This is *supposed* to be checking if the type is a TAIT, since RPITs' wfness is implied by wf checking its parent item, but since `is_impl_trait_defn` returns `None` for non-local RPIT and async futures, we unnecessarily consider wf predicates for an RPIT if it is coming from a foreign crate.
Fixes#107036
r? `@oli-obk` but feel free to reassign
even more unify Projection/Opaque handling in region outlives code
edit: This continues ate the same pace as #106829. New changes are described in https://github.com/rust-lang/rust/pull/106910#issuecomment-1383251254.
~This touches `OutlivesBound`, `Component`, `GenericKind` enums.~
r? `@oli-obk` (because of overlap with #95474)
document + UI test `E0208` and make its output more user-friendly
Cleans up `E0208`'s output a lot. It could actually be useful for someone learning about variance now. I also added a UI test for it in `tests/ui/error-codes/` and wrote some docs for it.
r? `@GuillaumeGomez` another error code, can't be bothered to find the issue :P. Obviously there's some compiler stuff, so you'll have to hand it off.
Part of https://github.com/rust-lang/rust/issues/61137.
make `CastError::NeedsDeref` create a `MachineApplicable` suggestion
Fixes#106903
Simple impl for the linked issue. I also made some other small changes:
- `CastError::ErrorGuaranteed` now owns an actual `ErrorGuaranteed`. This better enforces the static guarantees of `ErrorGuaranteed`.
- `CastError::NeedDeref` code simplified a bit, we now just suggest the `*`, instead of the whole expression as well.
Transform async `ResumeTy` in generator transform
- Eliminates all the `get_context` calls that async lowering created.
- Replace all `Local` `ResumeTy` types with `&mut Context<'_>`.
The `Local`s that have their types replaced are:
- The `resume` argument itself.
- The argument to `get_context`.
- The yielded value of a `yield`.
The `ResumeTy` hides a `&mut Context<'_>` behind an unsafe raw pointer, and the `get_context` function is being used to convert that back to a `&mut Context<'_>`.
Ideally the async lowering would not use the `ResumeTy`/`get_context` indirection, but rather directly use `&mut Context<'_>`, however that would currently lead to higher-kinded lifetime errors.
See <https://github.com/rust-lang/rust/issues/105501>.
The async lowering step and the type / lifetime inference / checking are still using the `ResumeTy` indirection for the time being, and that indirection is removed here. After this transform, the generator body only knows about `&mut Context<'_>`.
---
Fixes https://github.com/bjorn3/rustc_codegen_cranelift/issues/1330 CC `@bjorn3`
r? `@compiler-errors`
