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authorbors[bot] <26634292+bors[bot]@users.noreply.github.com>2021-04-06 14:43:37 +0100
committerGitHub <[email protected]>2021-04-06 14:43:37 +0100
commit7d39b13996e312a8a738ed0dfccab45978fc42f8 (patch)
tree91761b9bf78d9015fbb6083b9245eb9f6133e234 /crates/vfs
parent12e86433ab57ee8b1c96b8da0480fd311752487b (diff)
parent4e2a6ac7eae3ff193962421cc3c86e5d8f9a7e31 (diff)
Merge #8364
8364: Memory usage improvements r=jonas-schievink a=alexmaco These are mostly focused on splitting up enum variants with large size differences between variants by `Box`-ing things up. In my testing this reduces the memory usage somewhere in the low percentages, even though the measurements are quite noisy. Co-authored-by: Alexandru Macovei <[email protected]>
Diffstat (limited to 'crates/vfs')
-rw-r--r--crates/vfs/Cargo.toml1
-rw-r--r--crates/vfs/src/path_interner.rs29
2 files changed, 17 insertions, 13 deletions
diff --git a/crates/vfs/Cargo.toml b/crates/vfs/Cargo.toml
index c318a68f7..894944b18 100644
--- a/crates/vfs/Cargo.toml
+++ b/crates/vfs/Cargo.toml
@@ -14,3 +14,4 @@ rustc-hash = "1.0"
14fst = "0.4" 14fst = "0.4"
15 15
16paths = { path = "../paths", version = "0.0.0" } 16paths = { path = "../paths", version = "0.0.0" }
17indexmap = "1.6.2"
diff --git a/crates/vfs/src/path_interner.rs b/crates/vfs/src/path_interner.rs
index 2189e5e25..6e049f0d4 100644
--- a/crates/vfs/src/path_interner.rs
+++ b/crates/vfs/src/path_interner.rs
@@ -1,15 +1,22 @@
1//! Maps paths to compact integer ids. We don't care about clearings paths which 1//! Maps paths to compact integer ids. We don't care about clearings paths which
2//! no longer exist -- the assumption is total size of paths we ever look at is 2//! no longer exist -- the assumption is total size of paths we ever look at is
3//! not too big. 3//! not too big.
4use rustc_hash::FxHashMap; 4use std::hash::BuildHasherDefault;
5
6use indexmap::IndexSet;
7use rustc_hash::FxHasher;
5 8
6use crate::{FileId, VfsPath}; 9use crate::{FileId, VfsPath};
7 10
8/// Structure to map between [`VfsPath`] and [`FileId`]. 11/// Structure to map between [`VfsPath`] and [`FileId`].
9#[derive(Default)]
10pub(crate) struct PathInterner { 12pub(crate) struct PathInterner {
11 map: FxHashMap<VfsPath, FileId>, 13 map: IndexSet<VfsPath, BuildHasherDefault<FxHasher>>,
12 vec: Vec<VfsPath>, 14}
15
16impl Default for PathInterner {
17 fn default() -> Self {
18 Self { map: IndexSet::default() }
19 }
13} 20}
14 21
15impl PathInterner { 22impl PathInterner {
@@ -17,7 +24,7 @@ impl PathInterner {
17 /// 24 ///
18 /// If `path` does not exists in `self`, returns [`None`]. 25 /// If `path` does not exists in `self`, returns [`None`].
19 pub(crate) fn get(&self, path: &VfsPath) -> Option<FileId> { 26 pub(crate) fn get(&self, path: &VfsPath) -> Option<FileId> {
20 self.map.get(path).copied() 27 self.map.get_index_of(path).map(|i| FileId(i as u32))
21 } 28 }
22 29
23 /// Insert `path` in `self`. 30 /// Insert `path` in `self`.
@@ -25,13 +32,9 @@ impl PathInterner {
25 /// - If `path` already exists in `self`, returns its associated id; 32 /// - If `path` already exists in `self`, returns its associated id;
26 /// - Else, returns a newly allocated id. 33 /// - Else, returns a newly allocated id.
27 pub(crate) fn intern(&mut self, path: VfsPath) -> FileId { 34 pub(crate) fn intern(&mut self, path: VfsPath) -> FileId {
28 if let Some(id) = self.get(&path) { 35 let (id, _added) = self.map.insert_full(path);
29 return id; 36 assert!(id < u32::MAX as usize);
30 } 37 FileId(id as u32)
31 let id = FileId(self.vec.len() as u32);
32 self.map.insert(path.clone(), id);
33 self.vec.push(path);
34 id
35 } 38 }
36 39
37 /// Returns the path corresponding to `id`. 40 /// Returns the path corresponding to `id`.
@@ -40,6 +43,6 @@ impl PathInterner {
40 /// 43 ///
41 /// Panics if `id` does not exists in `self`. 44 /// Panics if `id` does not exists in `self`.
42 pub(crate) fn lookup(&self, id: FileId) -> &VfsPath { 45 pub(crate) fn lookup(&self, id: FileId) -> &VfsPath {
43 &self.vec[id.0 as usize] 46 self.map.get_index(id.0 as usize).unwrap()
44 } 47 }
45} 48}