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const trait things in libcore
(cherry picked from commit 16f8396f6df6902eeef580396785ab8888c3718b)
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(cherry picked from commit 6724f9926c9e8c2d37e3e68e44238897bd89fddf)
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(cherry picked from commit c4e61faf2e078dc30b62488326404137600e5e11)
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rustdoc: correctly render the return type of cross-crate async fns
Fixes #115760.
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Enable effects for libcore
~~r? `@oli-obk~~`
forgot you are on vacation, oops
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rename mir::Constant -> mir::ConstOperand, mir::ConstKind -> mir::Const
Also, be more consistent with the `to/eval_bits` methods... we had some that take a type and some that take a size, and then sometimes the one that takes a type is called `bits_for_ty`.
Turns out that `ty::Const`/`mir::ConstKind` carry their type with them, so we don't need to even pass the type to those `eval_bits` functions at all.
However this is not properly consistent yet: in `ty` we have most of the methods on `ty::Const`, but in `mir` we have them on `mir::ConstKind`. And indeed those two types are the ones that correspond to each other. So `mir::ConstantKind` should actually be renamed to `mir::Const`. But what to do with `mir::Constant`? It carries around a span, that's really more like a constant operand that appears as a MIR operand... it's more suited for `syntax.rs` than `consts.rs`, but the bigger question is, which name should it get if we want to align the `mir` and `ty` types? `ConstOperand`? `ConstOp`? `Literal`? It's not a literal but it has a field called `literal` so it would at least be consistently wrong-ish...
``@oli-obk`` any ideas?
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Pretty-print argument-position impl trait to name it.
This removes a corner case.
RPIT and TAIT keep having no name, and it would be wrong to use the one in HIR (Ident::empty), so I make this case ICE.
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move things out of mir/mod.rs
This moves a bunch of things out of `mir/mod.rs`:
- all const-related stuff to a new file consts.rs
- all statement/place/operand-related stuff to a new file statement.rs
- all pretty-printing related stuff to pretty.rs
`mod.rs` started out with 3100 lines and ends up with 1600. :)
Also there was some pretty-printing stuff in terminator.rs, that also got moved to pretty.rs, and I reordered things in pretty.rs so that it can be grouped by functionality.
Only the commit "use pretty_print_const_value from MIR constant 'extra' printing" has any behavior changes; it resolves the issue of having a fancy and a very crude pretty-printer for `ConstValue`.
r? `@oli-obk`
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rustdoc-search: add support for type parameters
r? `@GuillaumeGomez`
## Preview
* https://notriddle.com/rustdoc-html-demo-4/advanced-search/rustdoc/read-documentation/search.html
* https://notriddle.com/rustdoc-html-demo-4/advanced-search/std/index.html?search=option%3Coption%3CT%3E%3E%20-%3E%20option%3CT%3E
* https://notriddle.com/rustdoc-html-demo-4/advanced-search/std/index.html?search=option%3CT%3E,%20E%20-%3E%20result%3CT,%20E%3E
* https://notriddle.com/rustdoc-html-demo-4/advanced-search/std/index.html?search=-%3E%20option%3CT%3E
## Description
When writing a type-driven search query in rustdoc, specifically one with more than one query element, non-existent types become generic parameters instead of auto-correcting (which is currently only done for single-element queries) or giving no result. You can also force a generic type parameter by writing `generic:T` (and can force it to not use a generic type parameter with something like `struct:T` or whatever, though if this happens it means the thing you're looking for doesn't exist and will give you no results).
There is no syntax provided for specifying type constraints for generic type parameters.
When you have a generic type parameter in a search query, it will only match up with generic type parameters in the actual function, not concrete types that match, not concrete types that implement a trait. It also strictly matches based on when they're the same or different, so `option<T>, option<U> -> option<U>` matches `Option::and`, but not `Option::or`. Similarly, `option<T>, option<T> -> option<T>` matches `Option::or`, but not `Option::and`.
## Motivation
This feature is motivated by the many "combinitor"-type functions found in generic libraries, such as Option, Future, Iterator, and Entry. These highly-generic functions have names that are almost completely arbitrary, and a type signature that tells you what it actually does.
This PR is a major step towards[^closure] being able to easily search for generic functions by their type signature instead of by name. Some examples of combinators that can be found using this PR (try them out in the preview):
* `option<option<T>> -> option<T>` returns Option::flatten
* `option<T> -> result<T>` returns Option::ok_or
* `option<result<T>> -> result<option<T>>` returns Option::transpose
* `entry<K, V>, FnOnce -> V` returns `Entry::or_insert_with` (and `or_insert_with_key`, since there's no way to specify the generics on FnOnce)
[^closure]:
For this feature to be as useful as it ought to be, you should be able to search for *trait-associated types* and *closures*. This PR does not implement either of these: they are **Future possibilities**.
Trait-associated types would allow queries like `option<T> -> iterator<item=T>` to return `Option::iter`. We should also allow `option<T> -> iterator<T>` to match the associated type version.
Closures would make a good way to query for things like `Option::map`. Closure support needs associated types to be represented in the search index, since `FnOnce() -> i32` desugars to `FnOnce<Output=i32, ()>`, so associated trait types should be implemented first. Also, we'd want to expose an easy way to query closures without specifying which of the three traits you want.
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this way we have mir::ConstValue and ty::ValTree as reasonably parallel
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r=notriddle,Manishearth,flip1995
Reuse rustdoc's doc comment handling in Clippy
Moves `source_span_for_markdown_range` and `span_of_attrs` (renamed to `span_of_fragments`) to `rustc_resolve::rustdoc` so it can be used in Clippy
Fixes https://github.com/rust-lang/rust-clippy/issues/10277
Fixes https://github.com/rust-lang/rust-clippy/issues/5593
Fixes https://github.com/rust-lang/rust-clippy/issues/10263
Fixes https://github.com/rust-lang/rust-clippy/issues/2581
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Implement fallback for effect param
r? `@oli-obk` or `@lcnr`
tracking issue for this ongoing work: https://github.com/rust-lang/rust/issues/110395
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rustdoc: show inner enum and struct in type definition for concrete type
This PR implements the [Display enum variants for generic enum in type def page](https://rust-lang.zulipchat.com/#narrow/stream/266220-rustdoc/topic/Display.20enum.20variants.20for.20generic.20enum.20in.20type.20def.20page) #rustdoc/zulip proposal.
This proposal comes from looking at [`TyKind`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/sty/type.TyKind.html) typedef from the compiler. On that page, the documentation is able to show the layout for each variant, but not the variants themselves. This proposal suggests showing the fields and variants for those "concrete type". This would mean that instead of having many unresolved generics, like in `IrTyKind`:
```rust
Array(I::Ty, I::Const),
Slice(I::Ty),
RawPtr(I::TypeAndMut),
Ref(I::Region, I::Ty, I::Mutability),
FnDef(I::DefId, I::GenericArgsRef),
```
those would be resolved with direct links to the proper types in the `TyKind` typedef page:
```rust
Array(Ty<'tcx>, Const<'tcx>),
Slice(Ty<'tcx>),
RawPtr(TypeAndMut<'tcx>),
Ref(Region<'tcx>, Ty<'tcx>, Mutability<'tcx>),
FnDef(DefId<'tcx>, GenericArgsRef<'tcx>),
```
Saving both time and confusion.
-----
<details>
<summary>Old description</summary>
I've chosen to add the enums and structs under the "Show Aliased Type" details, as well as showing the variants and fields under the usual "Variants" and "Fields" sections. ~~*under new the `Inner Variants` and `Inner Fields` sections (except for their names, they are identical to the one found in the enum, struct and union pages). Those sections are complementary and do not replace anything else.*~~
This PR proposes the following condition for showing the aliased type (basically, has the aliased type some generics that are all of them resolved):
- the typedef does NOT have any generics (modulo lifetimes)
- AND the aliased type has some generics
</details>
### Examples
```rust
pub enum IrTyKind<'a, I: Interner> {
/// Doc comment for AdtKind
AdtKind(&'a I::Adt),
/// and another one for TyKind
TyKind(I::Adt, I::Ty),
// no comment
StructKind { a: I::Adt, },
}
pub type TyKind<'a> = IrTyKind<'a, TyCtxt>;
```
<details>
<summary>Old</summary>
</details>
```rust
pub struct One<T> {
pub val: T,
#[doc(hidden)]
pub inner_tag: u64,
__hidden: T,
}
/// `One` with `u64` as payload
pub type OneU64 = One<u64>;
```
<details>
<summary>Old</summary>
</details>
r? `@GuillaumeGomez`
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When writing a type-driven search query in rustdoc, specifically one
with more than one query element, non-existent types become generic
parameters instead of auto-correcting (which is currently only done
for single-element queries) or giving no result. You can also force a
generic type parameter by writing `generic:T` (and can force it to not
use a generic type parameter with something like `struct:T` or whatever,
though if this happens it means the thing you're looking for doesn't
exist and will give you no results).
There is no syntax provided for specifying type constraints
for generic type parameters.
When you have a generic type parameter in a search query, it will only
match up with generic type parameters in the actual function, not
concrete types that match, not concrete types that implement a trait.
It also strictly matches based on when they're the same or different,
so `option<T>, option<U> -> option<U>` matches `Option::and`, but not
`Option::or`. Similarly, `option<T>, option<T> -> option<T>`` matches
`Option::or`, but not `Option::and`.
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Skip rendering metadata strings from include_str!/include_bytes!
The const rendering code in rustdoc completely ignores consts from expansions, but the compiler was rendering all consts. So some consts (namely those from `include_bytes!`) were rendered then ignored.
Most of the diff here is from moving `print_const_expr` from rustdoc into `rustc_hir_pretty` so that it can be used in rustdoc and when building rmeta files.
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lifetimes
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This let's us handle a multitude of things for free:
- #[doc(hidden)]
- private fields/variants
- --document-private-items
- --document-hidden-items
And correct in the process the determination of "has stripped items" by
doing the same logic done by other ones.
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r=notriddle
Improve code readability by moving fmt args directly into the string
There are some of occurrences where I also transformed `write!(f, "{}", x)` into `f.write_str(x.as_str())`.
r? `@notriddle`
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Add `{Local}ModDefId` to more strongly type DefIds`
Based on #110862 by `@Nilstrieb`
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Removes two pieces of mutable state.
Follow up to #114622.
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Some parser and AST cleanups
Things I found while looking closely at this code.
r? `@petrochenkov`
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get auto traits for parallel rustc
test for #106930
#[Edit] Since this doesn't block try build now, we can close https://github.com/rust-lang/rust/issues/106930
fixes #106930
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Signed-off-by: SparrowLii <liyuan179@huawei.com>
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This code currently uses a `while` loop and gathers token trees into a
vector, but it only succeeds in the case where there is a single token
tree. We can instead just call `parse_token_tree` once and then look for
`Eof` to detect the success case.
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It has a single call site.
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