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Cache macro expansion in semantics

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#5497 accidentally made syntax highlighting quadratic, due to
 repeated tokentreeizing of macros.
This commit is contained in:
Aleksey Kladov 2020-07-24 14:12:13 +02:00
parent b9ef6cf295
commit a432f87d66
1 changed files with 14 additions and 2 deletions
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16
crates/ra_hir/src/semantics.rs
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@ -89,6 +89,7 @@ pub struct Semantics<'db, DB> {
pub struct SemanticsImpl<'db> {
pub db: &'db dyn HirDatabase,
s2d_cache: RefCell<SourceToDefCache>,
expansion_info_cache: RefCell<FxHashMap<HirFileId, Option<ExpansionInfo>>>,
cache: RefCell<FxHashMap<SyntaxNode, HirFileId>>,
}
@ -275,7 +276,12 @@ impl<'db, DB: HirDatabase> Semantics<'db, DB> {
impl<'db> SemanticsImpl<'db> {
fn new(db: &'db dyn HirDatabase) -> Self {
Self { db, s2d_cache: Default::default(), cache: Default::default() }
SemanticsImpl {
db,
s2d_cache: Default::default(),
cache: Default::default(),
expansion_info_cache: Default::default(),
}
}
fn parse(&self, file_id: FileId) -> ast::SourceFile {
@ -328,7 +334,13 @@ impl<'db> SemanticsImpl<'db> {
return None;
}
let file_id = sa.expand(self.db, token.with_value(&macro_call))?;
let token = file_id.expansion_info(self.db.upcast())?.map_token_down(token.as_ref())?;
let token = self
.expansion_info_cache
.borrow_mut()
.entry(file_id)
.or_insert_with(|| file_id.expansion_info(self.db.upcast()))
.as_ref()?
.map_token_down(token.as_ref())?;
self.cache(find_root(&token.value.parent()), token.file_id);