Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/ide/src/prime_caches.rs')
-rw-r--r--crates/ide/src/prime_caches.rs157
1 files changed, 141 insertions, 16 deletions
diff --git a/crates/ide/src/prime_caches.rs b/crates/ide/src/prime_caches.rs
index 5eba1d1e27..b873329e86 100644
--- a/crates/ide/src/prime_caches.rs
+++ b/crates/ide/src/prime_caches.rs
@@ -2,10 +2,14 @@
//! sometimes is counter productive when, for example, the first goto definition
//! request takes longer to compute. This modules implemented prepopulation of
//! various caches, it's not really advanced at the moment.
+mod topologic_sort;
use hir::db::DefDatabase;
-use ide_db::base_db::{SourceDatabase, SourceDatabaseExt};
-use rustc_hash::FxHashSet;
+use ide_db::base_db::{
+ salsa::{Database, ParallelDatabase, Snapshot},
+ Cancelled, CrateGraph, CrateId, SourceDatabase, SourceDatabaseExt,
+};
+use rustc_hash::{FxHashMap, FxHashSet};
use crate::RootDatabase;
@@ -20,11 +24,144 @@ pub struct PrimeCachesProgress {
pub(crate) fn prime_caches(db: &RootDatabase, cb: &(dyn Fn(PrimeCachesProgress) + Sync)) {
let _p = profile::span("prime_caches");
let graph = db.crate_graph();
+ let to_prime = compute_crates_to_prime(db, &graph);
+
+ let n_total = to_prime.len();
+ for (n_done, &crate_id) in to_prime.iter().enumerate() {
+ let crate_name = graph[crate_id].display_name.as_deref().unwrap_or_default().to_string();
+
+ cb(PrimeCachesProgress { on_crate: crate_name, n_done, n_total });
+ // This also computes the DefMap
+ db.import_map(crate_id);
+ }
+}
+
+/// We're indexing many crates.
+#[derive(Debug)]
+pub struct ParallelPrimeCachesProgress {
+ /// the crates that we are currently priming.
+ pub crates_currently_indexing: Vec<String>,
+ /// the total number of crates we want to prime.
+ pub crates_total: usize,
+ /// the total number of crates that have finished priming
+ pub crates_done: usize,
+}
+
+pub(crate) fn parallel_prime_caches<F>(db: &RootDatabase, num_worker_threads: u8, cb: &F)
+where
+ F: Fn(ParallelPrimeCachesProgress) + Sync + std::panic::UnwindSafe,
+{
+ let _p = profile::span("prime_caches");
+
+ let graph = db.crate_graph();
+ let mut crates_to_prime = {
+ let crate_ids = compute_crates_to_prime(db, &graph);
+
+ let mut builder = topologic_sort::TopologicalSortIter::builder();
+
+ for &crate_id in &crate_ids {
+ let crate_data = &graph[crate_id];
+ let dependencies = crate_data
+ .dependencies
+ .iter()
+ .map(|d| d.crate_id)
+ .filter(|i| crate_ids.contains(i));
+
+ builder.add(crate_id, dependencies);
+ }
+
+ builder.build()
+ };
+
+ crossbeam_utils::thread::scope(move |s| {
+ let (work_sender, work_receiver) = crossbeam_channel::unbounded();
+ let (progress_sender, progress_receiver) = crossbeam_channel::unbounded();
+
+ enum ParallelPrimeCacheWorkerProgress {
+ BeginCrate { crate_id: CrateId, crate_name: String },
+ EndCrate { crate_id: CrateId, cancelled: bool },
+ }
+
+ let prime_caches_worker = move |db: Snapshot<RootDatabase>| {
+ while let Ok((crate_id, crate_name)) = work_receiver.recv() {
+ progress_sender
+ .send(ParallelPrimeCacheWorkerProgress::BeginCrate { crate_id, crate_name })?;
+
+ let cancelled = Cancelled::catch(|| {
+ // This also computes the DefMap
+ db.import_map(crate_id);
+ })
+ .is_err();
+
+ progress_sender
+ .send(ParallelPrimeCacheWorkerProgress::EndCrate { crate_id, cancelled })?;
+
+ if cancelled {
+ break;
+ }
+ }
+
+ Ok::<_, crossbeam_channel::SendError<_>>(())
+ };
+
+ for _ in 0..num_worker_threads {
+ let worker = prime_caches_worker.clone();
+ let db = db.snapshot();
+ s.spawn(move |_| worker(db));
+ }
+
+ let crates_total = crates_to_prime.len();
+ let mut crates_done = 0;
+
+ let mut is_cancelled = false;
+ let mut crates_currently_indexing =
+ FxHashMap::with_capacity_and_hasher(num_worker_threads as _, Default::default());
+
+ while !crates_to_prime.is_empty() && !is_cancelled {
+ for crate_id in &mut crates_to_prime {
+ work_sender
+ .send((
+ crate_id,
+ graph[crate_id].display_name.as_deref().unwrap_or_default().to_string(),
+ ))
+ .ok();
+ }
+
+ let worker_progress = match progress_receiver.recv() {
+ Ok(p) => p,
+ Err(_) => break,
+ };
+ match worker_progress {
+ ParallelPrimeCacheWorkerProgress::BeginCrate { crate_id, crate_name } => {
+ crates_currently_indexing.insert(crate_id, crate_name);
+ }
+ ParallelPrimeCacheWorkerProgress::EndCrate { crate_id, cancelled } => {
+ crates_currently_indexing.remove(&crate_id);
+ crates_to_prime.mark_done(crate_id);
+ crates_done += 1;
+ is_cancelled = cancelled;
+ }
+ };
+
+ let progress = ParallelPrimeCachesProgress {
+ crates_currently_indexing: crates_currently_indexing.values().cloned().collect(),
+ crates_done,
+ crates_total,
+ };
+
+ cb(progress);
+ db.unwind_if_cancelled();
+ }
+ })
+ .unwrap();
+}
+
+fn compute_crates_to_prime(db: &RootDatabase, graph: &CrateGraph) -> FxHashSet<CrateId> {
// We're only interested in the workspace crates and the `ImportMap`s of their direct
// dependencies, though in practice the latter also compute the `DefMap`s.
// We don't prime transitive dependencies because they're generally not visible in
// the current workspace.
- let to_prime: FxHashSet<_> = graph
+ graph
.iter()
.filter(|&id| {
let file_id = graph[id].root_file_id;
@@ -32,17 +169,5 @@ pub(crate) fn prime_caches(db: &RootDatabase, cb: &(dyn Fn(PrimeCachesProgress)
!db.source_root(root_id).is_library
})
.flat_map(|id| graph[id].dependencies.iter().map(|krate| krate.crate_id))
- .collect();
-
- // FIXME: This would be easy to parallelize, since it's in the ideal ordering for that.
- // Unfortunately rayon prevents panics from propagation out of a `scope`, which breaks
- // cancellation, so we cannot use rayon.
- let n_total = to_prime.len();
- for (n_done, &crate_id) in to_prime.iter().enumerate() {
- let crate_name = graph[crate_id].display_name.as_deref().unwrap_or_default().to_string();
-
- cb(PrimeCachesProgress { on_crate: crate_name, n_done, n_total });
- // This also computes the DefMap
- db.import_map(crate_id);
- }
+ .collect()
}