| Commit message (Collapse) | Author | Age | Files | Lines |
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3050: Refactor type parameters, implement argument position impl trait r=matklad a=flodiebold
I wanted to implement APIT by lowering to type parameters because we need to do that anyway for correctness and don't need Chalk support for it; this grew into some more wide-ranging refactoring of how type parameters are handled :sweat_smile:
- use Ty::Bound instead of Ty::Param to represent polymorphism, and explicitly
count binders. This gets us closer to Chalk's way of doing things, and means
that we now only use Param as a placeholder for an unknown type, e.g. within
a generic function. I.e. we're never using Param in a situation where we want
to substitute it, and the method to do that is gone; `subst` now always works
on bound variables. (This changes how the types of generic functions print;
previously, you'd get something like `fn identity<i32>(T) -> T`, but now we
display the substituted signature `fn identity<i32>(i32) -> i32`, which I think
makes more sense.)
- once we do this, it's more natural to represent `Param` by a globally unique
ID; the use of indices was mostly to make substituting easier. This also
means we fix the bug where `Param` loses its name when going through Chalk.
- I would actually like to rename `Param` to `Placeholder` to better reflect its use and
get closer to Chalk, but I'll leave that to a follow-up.
- introduce a context for type lowering, to allow lowering `impl Trait` to
different things depending on where we are. And since we have that, we can
also lower type parameters directly to variables instead of placeholders.
Also, we'll be able to use this later to collect diagnostics.
- implement argument position impl trait by lowering it to type parameters.
I've realized that this is necessary to correctly implement it; e.g. consider
`fn foo(impl Display) -> impl Something`. It's observable that the return
type of e.g. `foo(1u32)` unifies with itself, but doesn't unify with e.g.
`foo(1i32)`; so the return type needs to be parameterized by the argument
type.
This fixes a few bugs as well:
- type parameters 'losing' their name when they go through Chalk, as mentioned
above (i.e. getting `[missing name]` somewhere)
- impl trait not being considered as implementing the super traits (very
noticeable for the `db` in RA)
- the fact that argument impl trait was only turned into variables when the
function got called caused type mismatches when the function was used as a
value (fixes a few type mismatches in RA)
The one thing I'm not so happy with here is how we're lowering `impl Trait` types to variables; since `TypeRef`s don't have an identity currently, we just count how many of them we have seen while going through the function signature. That's quite fragile though, since we have to do it while desugaring generics and while lowering the type signature, and in the exact same order in both cases. We could consider either giving only `TypeRef::ImplTrait` a local id, or maybe just giving all `TypeRef`s an identity after all (we talked about this before)...
Follow-up tasks:
- handle return position impl trait; we basically need to create a variable and some trait obligations for that variable
- rename `Param` to `Placeholder`
Co-authored-by: Florian Diebold <[email protected]>
Co-authored-by: Florian Diebold <[email protected]>
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2982: Merge imports when auto importing r=flodiebold a=SomeoneToIgnore
Co-authored-by: Kirill Bulatov <[email protected]>
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This is the same change as we did with `crate_def_map` and it does seem
that we mostly spend time in salsa, without recomputing much on
rust-analyzer side.
Example output:
```
233ms - handle_inlay_hints
163ms - get_inlay_hints
163ms - SourceAnalyzer::new
67ms - def_with_body_from_child_node
67ms - analyze_container
67ms - analyze_container
67ms - Module::from_definition
67ms - Module::from_file
67ms - crate_def_map
0ms - parse_macro_query (6 calls)
0ms - raw_items_query (1 calls)
66ms - ???
0ms - crate_def_map (1 calls)
0ms - crate_def_map (1 calls)
96ms - infer
2ms - trait_solve_query (2 calls)
94ms - ???
0ms - body_with_source_map_query (1 calls)
0ms - crate_def_map (1 calls)
[...]
```
Signed-off-by: Michal Terepeta <[email protected]>
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This change:
- introduces `compute_crate_def_map` query and renames
`CrateDefMap::crate_def_map_query` for consistency,
- annotates `crate_def_map` as `salsa::transparent` and adds a
top-level `crate_def_map` wrapper function around that starts the
profiler and immediately calls into `compute_crate_def_map` query.
This allows us to better understand where we spent the time, in
particular, how much is spent in the recomputaiton and how much in
salsa.
Example output (where we don't actually re-compute anything, but the
query still takes a non-trivial amount of time):
```
211ms - handle_inlay_hints
150ms - get_inlay_hints
150ms - SourceAnalyzer::new
65ms - def_with_body_from_child_node
65ms - analyze_container
65ms - analyze_container
65ms - Module::from_definition
65ms - Module::from_file
65ms - crate_def_map
1ms - parse_macro_query (6 calls)
0ms - raw_items_query (1 calls)
64ms - ???
```
Signed-off-by: Michal Terepeta <[email protected]>
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With this change the output `ra_prof` gives a better indication where
the time is spent. Example output:
```
213ms - publish_diagnostics
213ms - diagnostics
70ms - Module::from_definition
70ms - Module::from_file
132ms - Module::diagnostics
78ms - Function::diagnostics
0ms - body_with_source_map_query (1 calls)
2ms - trait_solve_query (1 calls)
76ms - ???
15ms - Function::diagnostics
0ms - body_with_source_map_query (1 calls)
15ms - trait_solve_query (5 calls)
38ms - Function::diagnostics (51 calls)
8ms - parse_query (1 calls)
```
Signed-off-by: Michal Terepeta <[email protected]>
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2650: Add macro call support for SourceAnalyzer::type_of r=matklad a=edwin0cheng
Co-authored-by: Edwin Cheng <[email protected]>
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