instrument-coverage: try our best to not ICE
instrument-coverage was ICEing for me on some code, in particular code
that had devirtualized paths from standard library. Instrument coverage
probably has no bussiness dictating which paths are valid and which
aren't so just feed it everything and whatever and let tooling deal with
other stuff.
For example, with this commit we can generate coverage hitpoints for
these interesting paths:
* `/rustc/.../library/core/lib.rs` – non-devirtualized path for libcore
* `/home/.../src/library/core/lib.rs` – devirtualized version of above
* `<inline asm>`, `<anon>` and many similar synthetic paths
Even if those paths somehow get to the instrumentation pass, I'd much
rather get hits for these weird paths and hope some of them work (as
would be the case for devirtualized path to libcore), rather than have
compilation fail entirely.
Deny broken intra-doc links in linkchecker
Since rustdoc isn't warning about these links, check for them manually.
This also fixes the broken links that popped up from the lint.
Suggest minimal subset features in `incomplete_features` lint
This tells users that we have a minimal subset feature of it and they can fix the lint warning without allowing it.
The wording improvement is helpful :)
Fixes#77913
resolve: further improvements to "try using the enum's variant" diagnostic
Follow-up on https://github.com/rust-lang/rust/pull/77341#issuecomment-702738281.
This PR improves the diagnostic modified in #77341 to suggest not only those variants which do not have fields, but those with fields (by suggesting with placeholders). In addition, the wording of the tuple-variant-only case is improved slightly.
I've not made further changes to the tuple-variant-only case (e.g. to only suggest variants with the correct number of fields) because I don't think I have enough information to do so reliably (e.g. in the case where there is an attempt to construct a tuple variant, I have no information on how many fields were provided; and in the case of pattern matching, I only have a slice of spans and would need to check for things like `..` in those spans, which doesn't seem worth it).
r? @estebank
stabilize union with 'ManuallyDrop' fields and 'impl Drop for Union'
As [discussed by @SimonSapin and @withoutboats](https://github.com/rust-lang/rust/issues/55149#issuecomment-634692020), this PR proposes to stabilize parts of the `untagged_union` feature gate:
* It will be possible to have a union with field type `ManuallyDrop<T>` for any `T`.
* While at it I propose we also stabilize `impl Drop for Union`; to my knowledge, there are no open concerns around this feature.
In the RFC discussion, we also talked about allowing `&mut T` as another non-`Copy` non-dropping type, but that felt to me like an overly specific exception so I figured we'd wait if there is actually any use for such a special case.
Some things remain unstable and still require the `untagged_union` feature gate:
* Union with fields that do not drop, are not `Copy`, and are not `ManuallyDrop<_>`. The reason to not stabilize this is to avoid semver concerns around libraries adding `Drop` implementations later. (This is already not fully semver compatible as, to my knowledge, the borrow checker will exploit the non-dropping nature of any type, but it seems prudent to avoid further increasing the amount of trouble adding an `impl Drop` can cause.)
Due to this, quite a few tests still need the `untagged_union` feature, but I think the ones where I could remove the feature flag provide good test coverage for the stable part.
Cc @rust-lang/lang
instrument-coverage was ICEing for me on some code, in particular code
that had devirtualized paths from standard library. Instrument coverage
probably has no bussiness dictating which paths are valid and which
aren't so just feed it everything and whatever and let tooling deal with
other stuff.
For example, with this commit we can generate coverage hitpoints for
these interesting paths:
* `/rustc/.../library/core/lib.rs` – non-devirtualized path for libcore
* `/home/.../src/library/core/lib.rs` – devirtualized version of above
* `<inline asm>`, `<anon>` and many similar synthetic paths
Even if those paths somehow get to the instrumentation pass, I'd much
rather get hits for these weird paths and hope some of them work (as
would be the case for devirtualized path to libcore), rather than have
compilation fail entirely.
Prevent miscompilation in trivial loop {}
Ideally, we would want to handle a broader set of cases to fully fix the
underlying bug here. That is currently relatively expensive at compile and
runtime, so we don't do that for now.
Performance results indicate this is not a major regression, if at all, so it should be safe to land.
cc #28728
Remove arena's dependency on `rustc_data_structures`
`rustc_arena` currently has a dependency on `rustc_data_structures` because of a trivial "don't inline me" function. This PR copies that function and removes the dependency.
Create a single source scope for promoteds
A promoted inherits all scopes from the parent body. At the same time,
almost all statements and terminators inside the promoted body so far
refer only to one of those scopes: the outermost one.
Instead of inheriting all scopes, inherit only a single scope
corresponding to the location of the promoted, making sure that there
are no references to other scopes.
rustc_parse: fix spans on cast and range exprs with attrs
Currently the span for cast and range expressions does not include the span of attributes associated to the lhs which is causing some issues for us in rustfmt.
```rust
fn foo() -> i64 {
#[attr]
1u64 as i64
}
fn bar() -> Range<i32> {
#[attr]
1..2
}
```
This corrects the span for cast and range expressions to fully include the span of child nodes
Stabilize move_ref_pattern
# Implementation
- Initially the rule was added in the run-up to 1.0. The AST-based borrow checker was having difficulty correctly enforcing match expressions that combined ref and move bindings, and so it was decided to simplify forbid the combination out right.
- The move to MIR-based borrow checking made it possible to enforce the rules in a finer-grained level, but we kept the rule in place in an effort to be conservative in our changes.
- In #68376, @Centril lifted the restriction but required a feature-gate.
- This PR removes the feature-gate.
Tracking issue: #68354.
# Description
This PR is to stabilize the feature `move_ref_pattern`, which allows patterns
containing both `by-ref` and `by-move` bindings at the same time.
For example: `Foo(ref x, y)`, where `x` is `by-ref`,
and `y` is `by-move`.
The rules of moving a variable also apply here when moving *part* of a variable,
such as it can't be referenced or moved before.
If this pattern is used, it would result in *partial move*, which means that
part of the variable is moved. The variable that was partially moved from
cannot be used as a whole in this case, only the parts that are still
not moved can be used.
## Documentation
- The reference (rust-lang/reference#881)
- Rust by example (rust-lang/rust-by-example#1377)
## Tests
There are many tests, but I think one of the comperhensive ones:
- [borrowck-move-ref-pattern-pass.rs](85fbf49ce0/src/test/ui/pattern/move-ref-patterns/borrowck-move-ref-pattern-pass.rs)
- [borrowck-move-ref-pattern.rs](85fbf49ce0/src/test/ui/pattern/move-ref-patterns/borrowck-move-ref-pattern.rs)
# Examples
```rust
#[derive(PartialEq, Eq)]
struct Finished {}
#[derive(PartialEq, Eq)]
struct Processing {
status: ProcessStatus,
}
#[derive(PartialEq, Eq)]
enum ProcessStatus {
One,
Two,
Three,
}
#[derive(PartialEq, Eq)]
enum Status {
Finished(Finished),
Processing(Processing),
}
fn check_result(_url: &str) -> Status {
// fetch status from some server
Status::Processing(Processing {
status: ProcessStatus::One,
})
}
fn wait_for_result(url: &str) -> Finished {
let mut previous_status = None;
loop {
match check_result(url) {
Status::Finished(f) => return f,
Status::Processing(p) => {
match (&mut previous_status, p.status) {
(None, status) => previous_status = Some(status), // first status
(Some(previous), status) if *previous == status => {} // no change, ignore
(Some(previous), status) => { // Now it can be used
// new status
*previous = status;
}
}
}
}
}
}
```
Before, we would have used:
```rust
match (&previous_status, p.status) {
(Some(previous), status) if *previous == status => {} // no change, ignore
(_, status) => {
// new status
previous_status = Some(status);
}
}
```
Demonstrating *partial move*
```rust
fn main() {
#[derive(Debug)]
struct Person {
name: String,
age: u8,
}
let person = Person {
name: String::from("Alice"),
age: 20,
};
// `name` is moved out of person, but `age` is referenced
let Person { name, ref age } = person;
println!("The person's age is {}", age);
println!("The person's name is {}", name);
// Error! borrow of partially moved value: `person` partial move occurs
//println!("The person struct is {:?}", person);
// `person` cannot be used but `person.age` can be used as it is not moved
println!("The person's age from person struct is {}", person.age);
}
```
mangling: mangle impl params w/ v0 scheme
This PR modifies v0 symbol mangling to include all generic parameters from impl blocks (not just those used in the self type) - an alternative fix to #75326.
```
original:
_RNCNvXCs4fqI2P2rA04_19impl_param_manglingINtB4_3FooppENtNtNtNtCsfnEnqCNU58Z_4core4iter6traits8iterator8Iterator4next0B4_
// |------------ B4_ ----------------|
// _R (N C (N v (X (C ((s 4fqI2p2rA04_) 19impl_param_mangling)) (I (N t B4_ 3Foo) pp E) (N t (N t (N t (N t (C ((s fnEnqCNU58Z_) 4core)) 4iter) 6traits) 8iterator) 8Iterator)) 4next) 0) B4_
modified:
_RNvXINICs4fqI2P2rA04_11issue_753260pppEINtB5_3FooppENtNtNtNtCsfnEnqCNU58Z_4core4iter6traits8iterator8Iterator4nextB5_
// _R (N v (X (I (N I (C ((s 4fqI2P2rA04_) 11issue_75326)) 0) ppp E) (I (N t B5_ 3Foo) pp E) (N t (N t (N t (N t (C ((s fnEnqCNU58Z_) 4core)) 4iter) 6traits) 8iterator) 8Iterator)) 4next) B5_
// | ^ |
// | | |
// | new impl namespace |
```
~~Submitted as a draft as after some discussion w/ @eddyb, I'm going to do some investigation into (yet more alternative) changes to polymorphization that might remove the necessity for this.~~
r? @eddyb
ensure arguments are included in count mismatch span
The current diagnostic isn't very helpful if the function header spans multiple lines. Lines comprising the function signature may be elided to keep the diagnostic short, but these lines are essential to fixing the error. This is made worse when the function has a body, because the last two lines of the span are then dedicated to showing the end of the body, which is irrelevant.
This PR changes the span to be a multispan made up of the header and the the arguments, ensuring they won't be elided. It also discards the function body from the span.
[Old](https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=f92d9f81a8c9416f0f04e4e09923b6d4):
```
error[E0061]: this function takes 6 arguments but 1 argument was supplied
--> src/main.rs:18:5
|
1 | / fn bar(
2 | | a: i32,
3 | | b: i32,
4 | | c: i32,
... |
14 | | println!("{}", f);
15 | | }
| |_- defined here
...
18 | bar(1);
| ^^^ - supplied 1 argument
| |
| expected 6 arguments
```
New:
```
error[E0061]: this function takes 6 arguments but 1 argument was supplied
--> $DIR/not-enough-arguments.rs:28:3
|
LL | bar(1);
| ^^^ - supplied 1 argument
| |
| expected 6 arguments
|
note: function defined here
--> $DIR/not-enough-arguments.rs:9:1
|
LL | / fn bar(
LL | | a: i32,
| | ^^^^^^^
LL | | b: i32,
| | ^^^^^^^
LL | | c: i32,
| | ^^^^^^^
LL | | d: i32,
| | ^^^^^^^
LL | | e: i32,
| | ^^^^^^^
LL | | f: i32,
| | ^^^^^^^
LL | | ) {
| |_^
```
This commit improves the tuple struct case added in rust-lang/rust#77341
so that the context is mentioned in more of the message.
Signed-off-by: David Wood <david@davidtw.co>
This commit improves the diagnostic modified in rust-lang/rust#77341 to
suggest not only those variants which do not have fields, but those with
fields (by suggesting with placeholders).
Signed-off-by: David Wood <david@davidtw.co>
Ideally, we would want to handle a broader set of cases to fully fix the
underlying bug here. That is currently relatively expensive at compile and
runtime, so we don't do that for now.
This commit modifies v0 symbol mangling to include all generic
parameters from impl blocks (not just those used in the self type).
Signed-off-by: David Wood <david@davidtw.co>
This commit adjust `#[rustc_symbol_name]` so that it can be applied to
non-monomorphic functions without producing an ICE.
Signed-off-by: David Wood <david@davidtw.co>
The wrapper type led to tons of target.target
across the compiler. Its ptr_width field isn't
required any more, as target_pointer_width
is already present in parsed form.
Preparation for a subsequent change that replaces
rustc_target::config::Config with its wrapped Target.
On its own, this commit breaks the build. I don't like making
build-breaking commits, but in this instance I believe that it
makes review easier, as the "real" changes of this PR can be
seen much more easily.
Result of running:
find compiler/ -type f -exec sed -i -e 's/target\.target\([)\.,; ]\)/target\1/g' {} \;
find compiler/ -type f -exec sed -i -e 's/target\.target$/target/g' {} \;
find compiler/ -type f -exec sed -i -e 's/target.ptr_width/target.pointer_width/g' {} \;
./x.py fmt
Rename target_pointer_width to pointer_width because it is already
member of the Target struct.
The compiler supports only three valid values for target_pointer_width:
16, 32, 64. Thus it can safely be turned into an int.
This means less allocations and clones as well as easier handling of the type.
Also change target_pointer_width to pointer_width.
Preparation for a subsequent type change of
target_pointer_width to an integer together with a rename
to pointer_width.
On its own, this commit breaks the build. I don't like making
build-breaking commits, but in this instance I believe that it
makes review easier, as the "real" changes of this PR can be
seen much more easily.
Result of running:
find compiler/rustc_target/src/spec/ -type f -exec sed -i -e 's/target_pointer_width: "\(.*\)"\..*,/pointer_width: \1,/g' {} \;
Replace tuple of infer vars for upvar_tys with single infer var
This commit allows us to decide the number of captures required after
completing capture ananysis, which is required as part of implementing
RFC-2229.
closes https://github.com/rust-lang/project-rfc-2229/issues/4
r? `@nikomatsakis`
Remove unused code
Rustc has a builtin lint for detecting unused code inside a crate, but when an item is marked `pub`, the code, even if unused inside the entire workspace, is never marked as such. Therefore, I've built [warnalyzer](https://github.com/est31/warnalyzer) to detect unused items in a cross-crate setting.
Closes https://github.com/est31/warnalyzer/issues/2
Rollup of 8 pull requests
Successful merges:
- #77765 (Add LLVM flags to limit DWARF version to 2 on BSD)
- #77788 (BTreeMap: fix gdb provider on BTreeMap with ZST keys or values)
- #77795 (Codegen backend interface refactor)
- #77808 (Moved the main `impl` for FnCtxt to its own file.)
- #77817 (Switch rustdoc from `clean::Stability` to `rustc_attr::Stability`)
- #77829 (bootstrap: only use compiler-builtins-c if they exist)
- #77870 (Use intra-doc links for links to module-level docs)
- #77897 (Move `Strip` into a separate rustdoc pass)
Failed merges:
- #77879 (Provide better documentation and help messages for x.py setup)
- #77902 (Include aarch64-pc-windows-msvc in the dist manifests)
r? `@ghost`
Switch rustdoc from `clean::Stability` to `rustc_attr::Stability`
This gives greater type safety and is less work to maintain on the rustdoc end. It also makes rustdoc more consistent with rustc.
Noticed this while working on https://github.com/rust-lang/rust/issues/76998.
- Remove `clean::Stability` in favor of `rustc_attr::Stability`
- Remove `impl Clean for Stability`; it's no longer necessary
r? @GuillaumeGomez
cc @petrochenkov
Moved the main `impl` for FnCtxt to its own file.
Resolves#77085 without breaking the API of the `FnCtxt` struct.
This is a solution to the file length being over 3000 (see issue #60302).
The other solution to the file length is
1. to change the API of this struct by
2. encapulating certain fields of the struct into other structs.
