Refactor macro-by-example code
I had a look at the MBE code because of #7857. I found some easy readability wins, that might also _marginally_ improve perf.
Allow configuration of annotation location.
I've added the ability to configure where lens annotations render relevant to the item they describe. Previously, these would render directly above the line the item is declared on. Now, there is the ability to render these annotations above the entire item (including doc comments, and attributes).
The names of the config options are up for debate, I did what seemed best to me but if anyone has better ideas let me know.
This is my first contribution so if I've missed anything please let me know.
Here's a preview of what the new option looks like:
<img width="577" alt="Screen Shot 2022-09-11 at 10 39 51 PM" src="https://user-images.githubusercontent.com/33100798/189570298-b4fcbf9c-ee49-4b79-aae6-1037ae4f26af.png">
closes https://github.com/rust-lang/rust-analyzer/issues/13218
fixup: remove unnecessary `Option`
Fixup for #13223, two things:
- `normalize_projection_query()` (and consequently `HirDatabase::normalize_projection()`) never returns `None` (well, it used to when I first wrote it...), so just return `Ty` instead of `Option<Ty>`
- When chalk cannot normalize projection uniquely, `normalize_trait_assoc_type()` used to return `None` before #13223, but not anymore because of the first point. I restored the behavior so its callers work as before.
Restructure `find_path` into a separate functions for modules and non-module items
Follow up to https://github.com/rust-lang/rust-analyzer/pull/13212
Also renames `prefer_core` imports config to `prefer_no_std` and changes the behavior of no_std path searching by preferring `core` paths `over` alloc
This PR turned into a slight rewrite, so it unfortunately does a few more things that I initially planned to (including a bug fix for enum variant paths)
New assist: move_format_string_arg
The name might need some improving.
```rust
fn main() {
print!("{x + 1}");
}
```
to
```rust
fn main() {
print!("{}"$0, x + 1);
}
```
fixes#13180
ref to #5988 for similar work
* extracted `format_like`'s parser to it's own module in `ide-db`
* reworked the parser's API to be more direct
* added assist to extract expressions in format args
fix: handle lifetime variables in projection normalization
Fixes#12674
The problem is that we've been skipping the binders of normalized projections assuming they should be empty, but the assumption is unfortunately wrong. We may get back lifetime variables and should handle them before returning them as normalized projections. For those who are curious why we get those even though we treat all lifetimes as 'static, [this comment in chalk](d875af0ff1/chalk-solve/src/infer/unify.rs (L888-L908)) may be interesting.
I thought using `InferenceTable` would be cleaner than the other ways as it already has the methods for canonicalization, normalizing projection, and resolving variables, so moved goal building and trait solving logic to a new `HirDatabase` query. I made it transparent query as the query itself doesn't do much work but the eventual call to `HirDatabase::trait_solve_query()` does.
Remove the toggleInlayHints command from VSCode
Inlay hints are no longer something specifc to r-a as it has been upstreamed into the LSP, we don't have a reason to give the config for this feature special treatment in regards to toggling. There are plenty of other options out there in the VSCode marketplace to create toggle commands/hotkeys for configurations in general which I believe we should nudge people towards instead.
fix: handle trait methods as inherent methods for trait-related types
Fixes#10677
When resolving methods for trait object types and placeholder types that are bounded by traits, we need to count the methods of the trait and its super traits as inherent methods. This matters because these trait methods have higher priority than the other traits' methods.
Relevant code in rustc: [`assemble_inherent_candidates_from_object()`](0631ea5d73/compiler/rustc_typeck/src/check/method/probe.rs (L783-L792)) for trait object types, [`assemble_inherent_candidates_from_param()`](0631ea5d73/compiler/rustc_typeck/src/check/method/probe.rs (L838-L847)) for placeholder types. Notice the second arg of `push_candidate()` is `is_inherent`.
Remove redundant 'resolve_obligations_as_possible' call
Hi! I was looking for a "good first issue" and saw this one: https://github.com/rust-lang/rust-analyzer/issues/7542. I like searching for performance improvements, so I wanted to try to find something useful there.
There are two tests in integrated_benchmarks.rs, I looked at 'integrated_highlighting_benchmark' (not the one discussed in the issue above).
Profile from that test looks like this:
```
$ RUN_SLOW_BENCHES=1 cargo test --release --package rust-analyzer --lib -- integrated_benchmarks::integrated_highlighting_benchmark --exact --nocapture
Finished release [optimized] target(s) in 0.06s
Running unittests src/lib.rs (target/release/deps/rust_analyzer-a80ca6bb8f877458)
running 1 test
workspace loading: 358.45ms
initial: 9.60s
change: 13.96µs
cpu profiling is disabled, uncomment `default = [ "cpu_profiler" ]` in Cargo.toml to enable.
273ms - highlight
143ms - infer:wait @ per_query_memory_usage
143ms - infer_query
0 - crate_def_map:wait (3165 calls)
4ms - deref_by_trait (967 calls)
96ms - resolve_obligations_as_possible (22106 calls)
0 - trait_solve::wait (2068 calls)
21ms - Semantics::analyze_impl (18 calls)
0 - SourceBinder::to_module_def (20 calls)
36ms - classify_name (19 calls)
19ms - classify_name_ref (308 calls)
0 - crate_def_map:wait (461 calls)
4ms - descend_into_macros (628 calls)
0 - generic_params_query (4 calls)
0 - impl_data_with_diagnostics_query (1 calls)
45ms - infer:wait (37 calls)
0 - resolve_obligations_as_possible (2 calls)
0 - source_file_to_def (1 calls)
0 - trait_solve::wait (42 calls)
after change: 275.23ms
test integrated_benchmarks::integrated_highlighting_benchmark ... ok
```
22106 calls to `resolve_obligations_as_possible` seem like the main issue there.
One thing I noticed (and fixed in this PR) is that `InferenceContext::resolve_ty_shallow` first calls `resolve_obligations_as_possible`, and then calls `InferenceTable::resolve_ty_shallow`. But `InferenceTable::resolve_ty_shallow` [inside](2e9f1204ca/crates/hir-ty/src/infer/unify.rs (L372)) again calls `resolve_obligations_as_possible`.
`resolve_obligations_as_possible` inside has a while loop, which works until it can't find any helpful information. So calling this function for the second time does nothing, so one of the calls could be safely removed.
`InferenceContext::resolve_ty_shallow` is actually quite a hot place, and after fixing it, the total number of `resolve_obligations_as_possible` in this test is reduced to 15516 (from 22106). "After change" time also improves from ~270ms to ~240ms, which is not a very huge win, but still something measurable.
Same profile after PR:
```
$ RUN_SLOW_BENCHES=1 cargo test --release --package rust-analyzer --lib -- integrated_benchmarks::integrated_highlighting_benchmark --exact --nocapture
Finished release [optimized] target(s) in 0.06s
Running unittests src/lib.rs (target/release/deps/rust_analyzer-a80ca6bb8f877458)
running 1 test
workspace loading: 339.86ms
initial: 9.28s
change: 10.69µs
cpu profiling is disabled, uncomment `default = [ "cpu_profiler" ]` in Cargo.toml to enable.
236ms - highlight
110ms - infer:wait @ per_query_memory_usage
110ms - infer_query
0 - crate_def_map:wait (3165 calls)
4ms - deref_by_trait (967 calls)
64ms - resolve_obligations_as_possible (15516 calls)
0 - trait_solve::wait (2068 calls)
21ms - Semantics::analyze_impl (18 calls)
0 - SourceBinder::to_module_def (20 calls)
34ms - classify_name (19 calls)
18ms - classify_name_ref (308 calls)
0 - crate_def_map:wait (461 calls)
3ms - descend_into_macros (628 calls)
0 - generic_params_query (4 calls)
0 - impl_data_with_diagnostics_query (1 calls)
45ms - infer:wait (37 calls)
0 - resolve_obligations_as_possible (2 calls)
0 - source_file_to_def (1 calls)
0 - trait_solve::wait (42 calls)
after change: 238.15ms
test integrated_benchmarks::integrated_highlighting_benchmark ... ok
```
The performance of this test could be further improved but at the cost of making code more complicated, so I wanted to check if such a change is desirable before sending another PR.
`resolve_obligations_as_possible` is actually called a lot of times even when no new information was provided. As I understand, `resolve_obligations_as_possible` could do something useful only if some variables/values were unified since the last check. We can store a boolean variable inside `InferenceTable`, which indicates if `try_unify` was called after last `resolve_obligations_as_possible`. If it wasn't called, we can safely not call `resolve_obligations_as_possible` again.
I tested this change locally, and it reduces the number of `resolve_obligations_as_possible` to several thousand (it is not shown in the profile anymore, so don't know the exact number), and the total time is reduced to ~180ms. Here is a generated profile:
```
$ RUN_SLOW_BENCHES=1 cargo test --release --package rust-analyzer --lib -- integrated_benchmarks::integrated_highlighting_benchmark --exact --nocapture
Finished release [optimized] target(s) in 0.06s
Running unittests src/lib.rs (target/release/deps/rust_analyzer-a80ca6bb8f877458)
running 1 test
workspace loading: 349.92ms
initial: 8.56s
change: 11.32µs
cpu profiling is disabled, uncomment `default = [ "cpu_profiler" ]` in Cargo.toml to enable.
175ms - highlight
21ms - Semantics::analyze_impl (18 calls)
0 - SourceBinder::to_module_def (20 calls)
33ms - classify_name (19 calls)
17ms - classify_name_ref (308 calls)
0 - crate_def_map:wait (461 calls)
3ms - descend_into_macros (628 calls)
0 - generic_params_query (4 calls)
0 - impl_data_with_diagnostics_query (1 calls)
97ms - infer:wait (38 calls)
0 - resolve_obligations_as_possible (2 calls)
0 - source_file_to_def (1 calls)
0 - trait_solve::wait (42 calls)
after change: 177.04ms
test integrated_benchmarks::integrated_highlighting_benchmark ... ok
```
Let me know if adding a new bool field seems like a reasonable tradeoff, so I can send a PR.
Previously, annotations would only appear above the name of an item (function signature, struct declaration, etc).
Now, rust-analyzer can be configured to show annotations either above the name or above the whole item (including doc comments and attributes).
Build release artifact against older Glibc
When GitHub [deprecated Ubuntu 18.04](https://github.blog/changelog/2022-08-09-github-actions-the-ubuntu-18-04-actions-runner-image-is-being-deprecated-and-will-be-removed-by-12-1-22/) runners, rust-analyzer was forced to bump runners to 20.04 which includes an updated Glib. This renders RA incompatible with the still popular Ubuntu 18.04 and other slightly older distro versions.
Until a deprecation plan is announced on RA's side, I propose binaries shall be built against older glibc to maintain compatibility.
This PR changes the Release CI workflow to build the `linux-x64/x86_64-unknown-linux-gnu` release in an Ubuntu 18.04 container.
Fixes#13081 and #13085
