bjoernager/rust
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Cache local DefId-keyed queries without hashing

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Foreign maps are used to cache external DefIds, typically backed by
metadata decoding. In the future we might skip caching `V` there (since
loading from metadata usually is already cheap enough), but for now this
cuts down on the impact to memory usage and time to None-init a bunch of
memory. Foreign data is usually much sparser, since we're not usually
loading *all* entries from the foreign crate(s).
This commit is contained in:
Mark Rousskov 2024-01-14 18:08:02 -05:00
parent 665d2c6f2c
commit 37849643c6
3 changed files with 82 additions and 3 deletions
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3
compiler/rustc_middle/src/query/keys.rs
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@ -9,6 +9,7 @@ use crate::ty::{self, Ty, TyCtxt};
use crate::ty::{GenericArg, GenericArgsRef};
use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LocalModDefId, ModDefId, LOCAL_CRATE};
use rustc_hir::hir_id::{HirId, OwnerId};
use rustc_query_system::query::DefIdCacheSelector;
use rustc_query_system::query::{DefaultCacheSelector, SingleCacheSelector, VecCacheSelector};
use rustc_span::symbol::{Ident, Symbol};
use rustc_span::{Span, DUMMY_SP};
@ -152,7 +153,7 @@ impl Key for LocalDefId {
}
impl Key for DefId {
type CacheSelector = DefaultCacheSelector<Self>;
type CacheSelector = DefIdCacheSelector;
fn default_span(&self, tcx: TyCtxt<'_>) -> Span {
tcx.def_span(*self)