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Add a tidy check for files with over 3,000 lines
Files with a large number of lines can cause issues in GitHub (e.g. https://github.com/rust-lang/rust/issues/60015) and also tend to be indicative of opportunities to refactor into less monolithic structures.
This adds a new check to tidy to warn against files that have more than 3,000 lines, as suggested in https://github.com/rust-lang/rust/issues/60015#issuecomment-483868594. (This number was chosen fairly arbitrarily as a reasonable indicator of size.) This check can be ignored with `// ignore-tidy-filelength`.
Existing files with greater than 3,000 lines currently ignore the check, but this helps us spot when files are getting too large. (We might try to split up all files larger than this in the future, as in https://github.com/rust-lang/rust/issues/60015).
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Here, ExprKind::Use(P<Expr>) tweaks the drop order to act the
same way as '{ let _tmp = expr; _tmp }' does.
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HirIdification: rework Map
The next iteration of HirIdification (#57578).
- remove `NodeId` from `Entry`
- change `Map::map` to an `FxHashMap<HirId, Entry>`
- base the `NodeId` `Map` methods on `HirId` ones (reverses the current state)
- HirIdify `librustdoc` a little bit (some `NodeId` `Map` methods were converted to work on `HirId`s)
The second change might have performance implications, so I'd do a perf run to be sure it's fine; it simplifies the codebase and shouldn't have an impact as long as the `Map` searches are cached (which is now possible thanks to using `HirId`s).
r? @Zoxc
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[wg-async-await] Drop `async fn` arguments in async block
Fixes #54716.
This PR modifies the HIR lowering (and some other places to make this work) so that unused arguments to a async function are always dropped inside the async move block and not at the end of the function body.
```
async fn foo(<pattern>: <type>) {
async move {
}
} // <-- dropped as you "exit" the fn
// ...becomes...
fn foo(__arg0: <ty>) {
async move {
let <pattern>: <ty> = __arg0;
} // <-- dropped as you "exit" the async block
}
```
However, the exact ordering of drops is not the same as a regular function, [as visible in this playground example](https://play.rust-lang.org/?version=stable&mode=debug&edition=2015&gist=be39af1a58e5d430be1eb3c722cb1ec3) - I believe this to be an unrelated issue. There is a [Zulip topic](https://rust-lang.zulipchat.com/#narrow/stream/187312-t-compiler.2Fwg-async-await/topic/.2354716.20drop.20order) for this.
r? @cramertj
cc @nikomatsakis
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This commit changes the order that arguments and bodies of async
functions are lowered so that when the body attempts to `lower_def` of a
upvar then the id has already been assigned by lowering the argument
first.
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This commit introduces an `ArgSource` enum that is lowered into the HIR
so that diagnostics can correctly refer to the argument pattern's
original name rather than the generated pattern.
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This commit extends the previous commit to apply to trait methods as
well as free functions.
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This commit takes advantage of `AsyncArgument` type that was added in a
previous commit to replace the arguments of the `async fn` in the HIR
and add statements to move the bindings from the new arguments to the
pattern from the old argument.
For example, the async function `foo` below:
async fn foo((x, _y): (T, V)) {
async move {
}
}
becomes:
async fn foo(__arg0: (T, V)) {
async move {
let (x, _y) = __arg0;
}
}
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This commit adds an `AsyncArgument` struct to the AST that contains the
generated argument and statement that will be used in HIR lowering, name
resolution and def collection.
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This will be used to keep track of the origin of a local in the AST. In
particular, it will be used by `async fn` lowering for the locals in
`let <pat>: <ty> = __arg0;` statements.
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Fix lifetime on LocalInternedString::get function
cc @eddyb @nnethercote
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async fn now lowers directly to an existential type declaration
rather than reusing the `impl Trait` return type lowering.
As part of this, it lowers all argument-position elided lifetimes
using the in-band-lifetimes machinery, creating fresh parameter
names for each of them, using each lifetime parameter as a generic
argument to the generated existential type.
This doesn't currently successfully allow multiple
argument-position elided lifetimes since `existential type`
doesn't yet support multiple lifetimes where neither outlive
the other. This requires a separate fix.
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Rename `type_parameters` to `generics` and so on
Some old variable names had fallen through the generics generalisation pull requests.
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Combine input and eval_always query types
Hardcoding `Krate` as a dependency of `eval_always` queries doesn't really make sense if we want to use the query system before HIR lowering / hashing. Without that hardcoding they become pretty much identical to `input` queries, so I combined them to a single type. This will regress the `clean` incremental scenario, but that isn't terribly common.
r? @michaelwoerister
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HirIdify hir::ItemId
Version of https://github.com/rust-lang/rust/pull/59092.
r? @oli-obk
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Make meta-item API compatible with `LocalInternedString::get` soundness fix
r? @Zoxc
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When moving out of a for loop head, suggest borrowing it
When encountering code like the following, suggest borrowing the for loop
head to avoid moving it into the for loop pattern:
```
fn main() {
let a = vec![1, 2, 3];
for i in &a {
for j in a {
println!("{} * {} = {}", i, j, i * j);
}
}
}
```
Fix #25534.
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When encountering code like the following, suggest borrowing the for loop
head to avoid moving it into the for loop pattern:
```
fn main() {
let a = vec![1, 2, 3];
for i in &a {
for j in a {
println!("{} * {} = {}", i, j, i * j);
}
}
}
```
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This commit moves the `DefId` field of `Def::Ctor` to be the first
field.
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This commit moves the definition of `CtorOf` from `rustc::hir` to
`rustc::hir::def` and adds imports wherever it is used.
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This commit removes `CtorOf` from `Node::Ctor` as the parent of the
constructor can be determined by looking at the node's parent in the few
places where knowing this is necessary.
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This commit makes two changes - separating the `NodeId` that identifies
an enum variant from the `NodeId` that identifies the variant's
constructor; and no longer creating a `NodeId` for `Struct`-style enum
variants and structs.
Separation of the variant id and variant constructor id will allow the
rest of RFC 2008 to be implemented by lowering the visibility of the
variant's constructor without lowering the visbility of the variant
itself.
No longer creating a `NodeId` for `Struct`-style enum variants and
structs mostly simplifies logic as previously this `NodeId` wasn't used.
There were various cases where the `NodeId` wouldn't be used unless
there was an unit or tuple struct or enum variant but not all uses of
this `NodeId` had that condition, by removing this `NodeId`, this must
be explicitly dealt with. This change mostly applied cleanly, but there
were one or two cases in name resolution and one case in type check
where the existing logic required a id for `Struct`-style enum variants
and structs.
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HirIdification: kill off NodeId stragglers
The final stages of HirIdification (#57578).
This PR, along with https://github.com/rust-lang/rust/pull/59042, should finalize the HirIdification process (at least the more straightforward bits).
- replace `NodeId` with `HirId` in `trait_impls`
- remove all `NodeId`s from `borrowck`
- remove all `NodeId`s from `typeck`
- remove all `NodeId`s from `mir`
- remove `trait_auto_impl` (unused)
I would be cool to also remove `NodeId` from `hir::def::Def`, `middle::privacy::AccessLevel` and `hir::ItemId`, but I don't know if this is feasible.
I'll be happy to do more if I've missed anything.
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some small HIR doc improvements
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Do not complain about non-existing fields after parse recovery
When failing to parse struct-like enum variants, the ADT gets recorded
as having no fields. Record that we have actually recovered during
parsing of this variant to avoid complaing about non-existing fields
when actually using it.
Fix #57361.
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Co-Authored-By: llogiq <bogusandre@gmail.com>
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Co-Authored-By: Gabriel Smith <yodaldevoid@users.noreply.github.com>
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