8 files changed, 22 insertions, 20 deletions

diff --git a/crates/ra_lsp_server/Cargo.toml b/crates/ra_lsp_server/Cargo.toml
index 32463e499..1fe6b2ebe 100644
--- a/crates/ra_lsp_server/Cargo.toml
+++ b/crates/ra_lsp_server/Cargo.toml
@@ -21,6 +21,7 @@ im = "12.0.0"
 cargo_metadata = "0.6.0"
 text_unit = { version = "0.1.2", features = ["serde"] }
 smol_str = { version = "0.1.5", features = ["serde"] }
+rustc-hash = "1.0"
 
 ra_syntax = { path = "../ra_syntax" }
 ra_editor = { path = "../ra_editor" }
diff --git a/crates/ra_lsp_server/src/lib.rs b/crates/ra_lsp_server/src/lib.rs
index d2f76972f..60652d55e 100644
--- a/crates/ra_lsp_server/src/lib.rs
+++ b/crates/ra_lsp_server/src/lib.rs
@@ -16,6 +16,7 @@ extern crate walkdir;
 extern crate im;
 extern crate relative_path;
 extern crate cargo_metadata;
+extern crate rustc_hash;
 
 extern crate gen_lsp_server;
 extern crate ra_editor;
diff --git a/crates/ra_lsp_server/src/main_loop/handlers.rs b/crates/ra_lsp_server/src/main_loop/handlers.rs
index 725036cc7..ab8be15e9 100644
--- a/crates/ra_lsp_server/src/main_loop/handlers.rs
+++ b/crates/ra_lsp_server/src/main_loop/handlers.rs
@@ -1,4 +1,4 @@
-use std::collections::{HashMap};
+use rustc_hash::FxHashMap;
 
 use languageserver_types::{
     Diagnostic, DiagnosticSeverity, DocumentSymbol,
@@ -267,7 +267,7 @@ pub fn handle_runnables(
             bin: "cargo".to_string(),
             args,
             env: {
-                let mut m = HashMap::new();
+                let mut m = FxHashMap::default();
                 m.insert(
                     "RUST_BACKTRACE".to_string(),
                     "short".to_string(),
diff --git a/crates/ra_lsp_server/src/main_loop/mod.rs b/crates/ra_lsp_server/src/main_loop/mod.rs
index 53c6f1dff..402615e42 100644
--- a/crates/ra_lsp_server/src/main_loop/mod.rs
+++ b/crates/ra_lsp_server/src/main_loop/mod.rs
@@ -3,7 +3,6 @@ mod subscriptions;
 
 use std::{
     path::PathBuf,
-    collections::{HashMap},
 };
 
 use serde::{Serialize, de::DeserializeOwned};
@@ -15,6 +14,7 @@ use gen_lsp_server::{
     RawRequest, RawNotification, RawMessage, RawResponse, ErrorCode,
     handle_shutdown,
 };
+use rustc_hash::FxHashMap;
 
 use {
     req,
@@ -50,7 +50,7 @@ pub fn main_loop(
     info!("server initialized, serving requests");
     let mut state = ServerWorldState::new();
 
-    let mut pending_requests = HashMap::new();
+    let mut pending_requests = FxHashMap::default();
     let mut subs = Subscriptions::new();
     let main_res = main_loop_inner(
         internal_mode,
@@ -95,7 +95,7 @@ fn main_loop_inner(
     fs_worker: Worker<PathBuf, (PathBuf, Vec<FileEvent>)>,
     ws_worker: Worker<PathBuf, Result<CargoWorkspace>>,
     state: &mut ServerWorldState,
-    pending_requests: &mut HashMap<u64, JobHandle>,
+    pending_requests: &mut FxHashMap<u64, JobHandle>,
     subs: &mut Subscriptions,
 ) -> Result<()> {
     let (libdata_sender, libdata_receiver) = unbounded();
@@ -213,7 +213,7 @@ fn main_loop_inner(
 fn on_task(
     task: Task,
     msg_sender: &Sender<RawMessage>,
-    pending_requests: &mut HashMap<u64, JobHandle>,
+    pending_requests: &mut FxHashMap<u64, JobHandle>,
 ) {
     match task {
         Task::Respond(response) => {
@@ -229,7 +229,7 @@ fn on_task(
 
 fn on_request(
     world: &mut ServerWorldState,
-    pending_requests: &mut HashMap<u64, JobHandle>,
+    pending_requests: &mut FxHashMap<u64, JobHandle>,
     pool: &ThreadPool,
     sender: &Sender<Task>,
     req: RawRequest,
@@ -269,7 +269,7 @@ fn on_request(
 fn on_notification(
     msg_sender: &Sender<RawMessage>,
     state: &mut ServerWorldState,
-    pending_requests: &mut HashMap<u64, JobHandle>,
+    pending_requests: &mut FxHashMap<u64, JobHandle>,
     subs: &mut Subscriptions,
     not: RawNotification,
 ) -> Result<()> {
diff --git a/crates/ra_lsp_server/src/main_loop/subscriptions.rs b/crates/ra_lsp_server/src/main_loop/subscriptions.rs
index 27f92cc9a..310153382 100644
--- a/crates/ra_lsp_server/src/main_loop/subscriptions.rs
+++ b/crates/ra_lsp_server/src/main_loop/subscriptions.rs
@@ -1,13 +1,13 @@
-use std::collections::HashSet;
+use rustc_hash::FxHashSet;
 use ra_analysis::FileId;
 
 pub struct Subscriptions {
-    subs: HashSet<FileId>,
+    subs: FxHashSet<FileId>,
 }
 
 impl Subscriptions {
     pub fn new() -> Subscriptions {
-        Subscriptions { subs: HashSet::new() }
+        Subscriptions { subs: FxHashSet::default() }
     }
     pub fn add_sub(&mut self, file_id: FileId) {
         self.subs.insert(file_id);
diff --git a/crates/ra_lsp_server/src/project_model.rs b/crates/ra_lsp_server/src/project_model.rs
index 5db34e3e5..43e4fd654 100644
--- a/crates/ra_lsp_server/src/project_model.rs
+++ b/crates/ra_lsp_server/src/project_model.rs
@@ -1,7 +1,7 @@
 use std::{
-    collections::{HashMap, HashSet},
     path::{Path, PathBuf},
 };
+use rustc_hash::{FxHashMap, FxHashSet};
 use cargo_metadata::{metadata_run, CargoOpt};
 use ra_syntax::SmolStr;
 
@@ -80,11 +80,11 @@ impl CargoWorkspace {
             true,
             Some(CargoOpt::AllFeatures)
         ).map_err(|e| format_err!("cargo metadata failed: {}", e))?;
-        let mut pkg_by_id = HashMap::new();
+        let mut pkg_by_id = FxHashMap::default();
         let mut packages = Vec::new();
         let mut targets = Vec::new();
 
-        let ws_members: HashSet<String> = meta.workspace_members
+        let ws_members: FxHashSet<String> = meta.workspace_members
             .into_iter()
             .map(|it| it.raw)
             .collect();
diff --git a/crates/ra_lsp_server/src/req.rs b/crates/ra_lsp_server/src/req.rs
index 458c79ea9..f80957589 100644
--- a/crates/ra_lsp_server/src/req.rs
+++ b/crates/ra_lsp_server/src/req.rs
@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use rustc_hash::FxHashMap;
 use languageserver_types::{TextDocumentIdentifier, Range, Url, Position, Location};
 use url_serde;
 
@@ -149,7 +149,7 @@ pub struct Runnable {
     pub label: String,
     pub bin: String,
     pub args: Vec<String>,
-    pub env: HashMap<String, String>,
+    pub env: FxHashMap<String, String>,
 }
 
 #[derive(Serialize, Debug)]
diff --git a/crates/ra_lsp_server/src/server_world.rs b/crates/ra_lsp_server/src/server_world.rs
index 865f7c491..c4cdf83d4 100644
--- a/crates/ra_lsp_server/src/server_world.rs
+++ b/crates/ra_lsp_server/src/server_world.rs
@@ -1,10 +1,10 @@
 use std::{
     fs,
     path::{PathBuf, Path},
-    collections::HashMap,
     sync::Arc,
 };
 
+use rustc_hash::FxHashMap;
 use languageserver_types::Url;
 use ra_analysis::{FileId, AnalysisHost, Analysis, CrateGraph, CrateId, LibraryData, FileResolver};
 
@@ -20,7 +20,7 @@ pub struct ServerWorldState {
     pub workspaces: Arc<Vec<CargoWorkspace>>,
     pub analysis_host: AnalysisHost,
     pub path_map: PathMap,
-    pub mem_map: HashMap<FileId, Option<String>>,
+    pub mem_map: FxHashMap<FileId, Option<String>>,
 }
 
 #[derive(Clone)]
@@ -36,7 +36,7 @@ impl ServerWorldState {
             workspaces: Arc::new(Vec::new()),
             analysis_host: AnalysisHost::new(),
             path_map: PathMap::new(),
-            mem_map: HashMap::new(),
+            mem_map: FxHashMap::default(),
         }
     }
     pub fn apply_fs_changes(&mut self, events: Vec<FileEvent>) {
@@ -121,7 +121,7 @@ impl ServerWorldState {
         Ok(file_id)
     }
     pub fn set_workspaces(&mut self, ws: Vec<CargoWorkspace>) {
-        let mut crate_roots = HashMap::new();
+        let mut crate_roots = FxHashMap::default();
         ws.iter()
           .flat_map(|ws| {
               ws.packages()