Feature: Add a memory layout viewer
**Motivation**: rustc by default doesn't enforce a particular memory layout, however it can be useful to see what it is doing under the hood, or if using a particular repr ensure it is behaving how you want it to. This command provides a way to visually explore memory layouts of structures.
**Example**:
this structure:
```rust
struct X {
x: i32,
y: u8,
z: Vec<bool>,
w: usize,
}
```
produces this output:
<img width="692" alt="image" src="https://github.com/rust-lang/rust-analyzer/assets/22418744/e0312233-18a7-4bb9-ae5b-7b52fcff158a">
**Work yet to be done**:
- tests (see below)
- html is mildly janky (see below)
- enums and unions are viewed flatly, how should they be represented?
- should niches be marked somehow?
This was written for my own use, and the jank is fine for me, but in its current state it is probably not ready to merge mostly because it is missing tests, and also because the code quality is not great. However, before I spend time fixing those things idk if this is even something wanted, if it is I am happy to clean it up, if not that's cool too.
`does_not_fill_wildcard_with_wildcard`
and `does_not_fill_wildcard_with_partial_wildcard_and_wildcard`
both made no modifications to the code,
which is a problem for mutable ast porting as it generates a best-effort
minimal set of text edits,
and assists require at least one text edit.
Stop inserting semicolon when extracting match arm
# Overview
Extracting a match arm value that has type unit into a function, when a
comma already follows the match arm value, results in an invalid (syntax
error) semicolon added between the newly generated function's generated
call and the comma.
# Example
Running this extraction
```rust
fn main() {
match () {
_ => $0()$0,
};
}
```
would lead to
```rust
fn main() {
match () {
_ => fun_name();,
};
}
fn fun_name() {
}
```
# Issue / Fix details
This happens because when there is no comma, rust-analyzer would simply
add the comma and wouldn't even try to evaluate whether it needs to add
a semicolon. But when the comma is there, it proceeds to evaluate
whether it needs to add a semicolon and it looks like the evaluation
logic erroneously ignores the possibility that we're in a match arm.
IIUC it never makes sense to add a semicolon when we're extracting from
a match arm value, so I've adjusted the logic to always decide against
adding a semicolon when we're in a match arm
Remind user to check $PATH after installation.
fixes#14882 . I don't think that this is the correct wording to express this but I at least wanted to take the initiative :)
# Overview
Extracting a match arm value that has type unit into a function, when a
comma already follows the match arm value, results in an invalid (syntax
error) semicolon added between the newly generated function's generated
call and the comma.
# Example
Running this extraction
```rust
fn main() {
match () {
_ => $0()$0,
};
}
```
would lead to
```rust
fn main() {
match () {
_ => fun_name();,
};
}
fn fun_name() {
}
```
# Issue / Fix details
This happens because when there is no comma, rust-analyzer would simply
add the comma and wouldn't even try to evaluate whether it needs to add
a semicolon. But when the comma is there, it proceeds to evaluate
whether it needs to add a semicolon and it looks like the evaluation
logic erroneously ignores the possibility that we're in a match arm.
IIUC it never makes sense to add a semicolon when we're extracting from
a match arm value, so I've adjusted the logic to always decide against
adding a semicolon when we're in a match arm
Can actually split out adding the functions from getting the impl to
update or create thanks to being able to refer to the impl ast node.
FIXME Context:
Unfortunately we can't adjust the indentation of the newly added function
inside of `ast::AssocItemList::add_item` since for some reason the `todo!()`
placeholder generated by `add_missing_impl_members` and
`replace_derive_with_manual_impl` gets indented weirdly.
Implement recursion in mir interpreter without recursion
This enables interpreting functions with deep stack + profiling. I also applied some changes to make it faster based on the profiling result.
Replace `x` with `it`
I kept some usages of `x`:
* `x`s that are used together with `y`, `z`, ...
* `x` that shadow `it`. I use `it` for iterators out of r-a, so there were some cases that I used `it` and `x` together.
* `x` in test fixtures. Many of those `x` usages was not me so I thought it's better to keep them as is.
I tried to remove the rest, but since there was too many `x` I might missed some of them or changed some of them that I didn't want to change.
Unify getter and setter assists
This PR combines what previously have been two different files into a single file. I want to talk about the reasons why I did this. The issue that prompted this PR ( and before I forget : this pr fixes#15080 ) mentions an interesting behavior. We combine these two assists into an assist group and the order in which the assists are listed in this group changes depending on the text range of the selected area. The reason for that is that VSCode prioritizes actions that have a bigger impact in a smaller area and until now generate setter assist was only possible to be invoked for a single field whereas you could generate multiple getters for the getter assist. So I used the latter's infra to make former applicable to multiple fields, hence the unification. So this PR solves in essence
1. Make `generate setter` applicable to multiple fields
2. Provide a consistent order of the said assists in listing.
Don't show `unresolved-field` diagnostic for missing names
I don't think reporting ``"no field `[missing name]` on type `SomeType`"`` makes much sense because it's a syntax error rather than a semantic error. We already report a syntax error for it and I find it sufficient.
