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Use ShardedHashMap for anon_node_to_index

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This commit is contained in:
John Kåre Alsaker 2025-03-18 13:08:33 +01:00
parent 129f39cb89
commit 58c148a3d8
1 changed files with 9 additions and 28 deletions
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37
compiler/rustc_query_system/src/dep_graph/graph.rs
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@ -1,5 +1,4 @@
use std::assert_matches::assert_matches;
use std::collections::hash_map::Entry;
use std::fmt::Debug;
use std::hash::Hash;
use std::marker::PhantomData;
@ -10,7 +9,7 @@ use rustc_data_structures::fingerprint::{Fingerprint, PackedFingerprint};
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::outline;
use rustc_data_structures::profiling::QueryInvocationId;
use rustc_data_structures::sharded::{self, Sharded};
use rustc_data_structures::sharded::{self, ShardedHashMap};
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_data_structures::sync::{AtomicU64, Lock};
use rustc_data_structures::unord::UnordMap;
@ -447,24 +446,9 @@ impl<D: Deps> DepGraphData<D> {
// As anonymous nodes are a small quantity compared to the full dep-graph, the
// memory impact of this `anon_node_to_index` map remains tolerable, and helps
// us avoid useless growth of the graph with almost-equivalent nodes.
match self
.current
.anon_node_to_index
.get_shard_by_value(&target_dep_node)
.lock()
.entry(target_dep_node)
{
Entry::Occupied(entry) => *entry.get(),
Entry::Vacant(entry) => {
let dep_node_index = self.current.intern_new_node(
target_dep_node,
task_deps,
Fingerprint::ZERO,
);
entry.insert(dep_node_index);
dep_node_index
}
}
self.current.anon_node_to_index.get_or_insert_with(target_dep_node, || {
self.current.intern_new_node(target_dep_node, task_deps, Fingerprint::ZERO)
})
}
};
@ -1123,7 +1107,7 @@ rustc_index::newtype_index! {
pub(super) struct CurrentDepGraph<D: Deps> {
encoder: GraphEncoder<D>,
prev_index_to_index: Lock<IndexVec<SerializedDepNodeIndex, Option<DepNodeIndex>>>,
anon_node_to_index: Sharded<FxHashMap<DepNode, DepNodeIndex>>,
anon_node_to_index: ShardedHashMap<DepNode, DepNodeIndex>,
/// This is used to verify that fingerprints do not change between the creation of a node
/// and its recomputation.
@ -1202,13 +1186,10 @@ impl<D: Deps> CurrentDepGraph<D> {
&session.prof,
previous,
),
anon_node_to_index: Sharded::new(|| {
FxHashMap::with_capacity_and_hasher(
// FIXME: The count estimate is off as anon nodes are only a portion of the nodes.
new_node_count_estimate / sharded::shards(),
Default::default(),
)
}),
anon_node_to_index: ShardedHashMap::with_capacity(
// FIXME: The count estimate is off as anon nodes are only a portion of the nodes.
new_node_count_estimate / sharded::shards(),
),
prev_index_to_index: Lock::new(IndexVec::from_elem_n(None, prev_graph_node_count)),
anon_id_seed,
#[cfg(debug_assertions)]