language-servers/rust-analyzer
1
0
Fork 0
mirror of https://github.com/rust-lang/rust-analyzer.git synced 2025-10-02 22:54:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 4

Implement semitransparent hygiene

Browse source 
Or macro_rules hygiene, or mixed site hygiene. In other words, hygiene for variables and labels but not items.

The realization that made me implement this was that while "full" hygiene (aka. def site hygiene) is really hard for us to implement, and will likely involve intrusive changes and performance losses, since every `Name` will have to carry hygiene, mixed site hygiene is very local: it applies only to bodies, and we very well can save it in a side map with minor losses.

This fixes one diagnostic in r-a that was about `izip!()` using hygiene (yay!) but it introduces a huge number of others, because of #18262. Up until now this issue wasn't a major problem because it only affected few cases, but with hygiene identifiers referred by macros like that are not resolved at all. The next commit will fix that.
This commit is contained in:
Chayim Refael Friedman 2024-10-07 23:02:02 +03:00
parent c286786888
commit 8adcbdcc49
23 changed files with 394 additions and 124 deletions
Download patch file Download diff file Expand all files Collapse all files

13
crates/hir/src/semantics.rs
View file

@ -45,7 +45,7 @@ use syntax::{
use crate::{
db::HirDatabase,
semantics::source_to_def::{ChildContainer, SourceToDefCache, SourceToDefCtx},
source_analyzer::{resolve_hir_path, SourceAnalyzer},
source_analyzer::{name_hygiene, resolve_hir_path, SourceAnalyzer},
Access, Adjust, Adjustment, Adt, AutoBorrow, BindingMode, BuiltinAttr, Callable, Const,
ConstParam, Crate, DeriveHelper, Enum, Field, Function, HasSource, HirFileId, Impl, InFile,
InlineAsmOperand, ItemInNs, Label, LifetimeParam, Local, Macro, Module, ModuleDef, Name,
@ -1952,10 +1952,15 @@ impl SemanticsScope<'_> {
/// Resolve a path as-if it was written at the given scope. This is
/// necessary a heuristic, as it doesn't take hygiene into account.
pub fn speculative_resolve(&self, path: &ast::Path) -> Option<PathResolution> {
pub fn speculative_resolve(&self, ast_path: &ast::Path) -> Option<PathResolution> {
let ctx = LowerCtx::new(self.db.upcast(), self.file_id);
let path = Path::from_src(&ctx, path.clone())?;
resolve_hir_path(self.db, &self.resolver, &path)
let path = Path::from_src(&ctx, ast_path.clone())?;
resolve_hir_path(
self.db,
&self.resolver,
&path,
name_hygiene(self.db, InFile::new(self.file_id, ast_path.syntax())),
)
}
/// Iterates over associated types that may be specified after the given path (using