Use FxHash{Map,Set} instead of the default Hash{Map,Set} everywhere in rustc.

src/librustc/hir/lowering.rs

@@ -50,14 +50,15 @@ use hir::GenericArg;
 use lint::builtin::{self, PARENTHESIZED_PARAMS_IN_TYPES_AND_MODULES,
                     ELIDED_LIFETIMES_IN_PATHS};
 use middle::cstore::CrateStore;
+use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::indexed_vec::IndexVec;
 use rustc_data_structures::small_vec::OneVector;
 use rustc_data_structures::thin_vec::ThinVec;
 use session::Session;
 use util::common::FN_OUTPUT_NAME;
 use util::nodemap::{DefIdMap, NodeMap};
 
-use std::collections::{BTreeMap, HashSet};
+use std::collections::BTreeMap;
 use std::fmt::Debug;
 use std::iter;
 use std::mem;
@@ -1342,7 +1343,7 @@ impl<'a> LoweringContext<'a> {
             exist_ty_id: NodeId,
             collect_elided_lifetimes: bool,
             currently_bound_lifetimes: Vec<hir::LifetimeName>,
-            already_defined_lifetimes: HashSet<hir::LifetimeName>,
+            already_defined_lifetimes: FxHashSet<hir::LifetimeName>,
             output_lifetimes: Vec<hir::GenericArg>,
             output_lifetime_params: Vec<hir::GenericParam>,
         }
@@ -1476,7 +1477,7 @@ impl<'a> LoweringContext<'a> {
             exist_ty_id,
             collect_elided_lifetimes: true,
             currently_bound_lifetimes: Vec::new(),
-            already_defined_lifetimes: HashSet::new(),
+            already_defined_lifetimes: FxHashSet::default(),
             output_lifetimes: Vec::new(),
             output_lifetime_params: Vec::new(),
         };

src/librustc/middle/weak_lang_items.rs

@@ -13,6 +13,7 @@
 use session::config;
 use middle::lang_items;
 
+use rustc_data_structures::fx::FxHashSet;
 use rustc_target::spec::PanicStrategy;
 use syntax::ast;
 use syntax::symbol::Symbol;
@@ -23,8 +24,6 @@ use hir::intravisit;
 use hir;
 use ty::TyCtxt;
 
-use std::collections::HashSet;
-
 macro_rules! weak_lang_items {
     ($($name:ident, $item:ident, $sym:ident;)*) => (
 
@@ -101,7 +100,7 @@ fn verify<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         return
     }
 
-    let mut missing = HashSet::new();
+    let mut missing = FxHashSet::default();
     for &cnum in tcx.crates().iter() {
         for &item in tcx.missing_lang_items(cnum).iter() {
             missing.insert(item);

src/librustc/session/config.rs

@@ -37,10 +37,10 @@ use std::collections::btree_map::Iter as BTreeMapIter;
 use std::collections::btree_map::Keys as BTreeMapKeysIter;
 use std::collections::btree_map::Values as BTreeMapValuesIter;
 
+use rustc_data_structures::fx::FxHashSet;
 use std::{fmt, str};
 use std::hash::Hasher;
 use std::collections::hash_map::DefaultHasher;
-use std::collections::HashSet;
 use std::iter::FromIterator;
 use std::path::{Path, PathBuf};
 
@@ -1373,7 +1373,7 @@ pub fn default_configuration(sess: &Session) -> ast::CrateConfig {
     let max_atomic_width = sess.target.target.max_atomic_width();
     let atomic_cas = sess.target.target.options.atomic_cas;
 
-    let mut ret = HashSet::new();
+    let mut ret = FxHashSet::default();
     // Target bindings.
     ret.insert((Symbol::intern("target_os"), Some(Symbol::intern(os))));
     if let Some(ref fam) = sess.target.target.options.target_family {

src/librustc/session/filesearch.rs

@@ -12,8 +12,8 @@
 
 pub use self::FileMatch::*;
 
+use rustc_data_structures::fx::FxHashSet;
 use std::borrow::Cow;
-use std::collections::HashSet;
 use std::env;
 use std::fs;
 use std::path::{Path, PathBuf};
@@ -40,7 +40,7 @@ impl<'a> FileSearch<'a> {
     pub fn for_each_lib_search_path<F>(&self, mut f: F) where
         F: FnMut(&Path, PathKind)
     {
-        let mut visited_dirs = HashSet::new();
+        let mut visited_dirs = FxHashSet::default();
 
         for (path, kind) in self.search_paths.iter(self.kind) {
             f(path, kind);

src/librustc/session/mod.rs

@@ -47,7 +47,6 @@ use jobserver::Client;
 
 use std;
 use std::cell::{self, Cell, RefCell};
-use std::collections::HashMap;
 use std::env;
 use std::fmt;
 use std::io::Write;
@@ -122,7 +121,7 @@ pub struct Session {
     /// Map from imported macro spans (which consist of
     /// the localized span for the macro body) to the
     /// macro name and definition span in the source crate.
-    pub imported_macro_spans: OneThread<RefCell<HashMap<Span, (String, Span)>>>,
+    pub imported_macro_spans: OneThread<RefCell<FxHashMap<Span, (String, Span)>>>,
 
     incr_comp_session: OneThread<RefCell<IncrCompSession>>,
 
@@ -1129,7 +1128,7 @@ pub fn build_session_(
         injected_allocator: Once::new(),
         allocator_kind: Once::new(),
         injected_panic_runtime: Once::new(),
-        imported_macro_spans: OneThread::new(RefCell::new(HashMap::new())),
+        imported_macro_spans: OneThread::new(RefCell::new(FxHashMap::default())),
         incr_comp_session: OneThread::new(RefCell::new(IncrCompSession::NotInitialized)),
         self_profiling: Lock::new(SelfProfiler::new()),
         profile_channel: Lock::new(None),

src/librustc/ty/query/job.rs

@@ -11,6 +11,7 @@
 #![allow(warnings)]
 
 use std::mem;
+use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::sync::{Lock, LockGuard, Lrc, Weak};
 use rustc_data_structures::OnDrop;
 use syntax_pos::Span;
@@ -21,7 +22,7 @@ use ty::context::TyCtxt;
 use errors::Diagnostic;
 use std::process;
 use std::{fmt, ptr};
-use std::collections::HashSet;
+
 #[cfg(parallel_queries)]
 use {
     rayon_core,
@@ -282,7 +283,7 @@ where
 fn cycle_check<'tcx>(query: Lrc<QueryJob<'tcx>>,
                      span: Span,
                      stack: &mut Vec<(Span, Lrc<QueryJob<'tcx>>)>,
-                     visited: &mut HashSet<*const QueryJob<'tcx>>
+                     visited: &mut FxHashSet<*const QueryJob<'tcx>>
 ) -> Option<Option<Waiter<'tcx>>> {
     if visited.contains(&query.as_ptr()) {
         return if let Some(p) = stack.iter().position(|q| q.1.as_ptr() == query.as_ptr()) {
@@ -321,7 +322,7 @@ fn cycle_check<'tcx>(query: Lrc<QueryJob<'tcx>>,
 #[cfg(parallel_queries)]
 fn connected_to_root<'tcx>(
     query: Lrc<QueryJob<'tcx>>,
-    visited: &mut HashSet<*const QueryJob<'tcx>>
+    visited: &mut FxHashSet<*const QueryJob<'tcx>>
 ) -> bool {
     // We already visited this or we're deliberately ignoring it
     if visited.contains(&query.as_ptr()) {
@@ -357,7 +358,7 @@ fn remove_cycle<'tcx>(
     wakelist: &mut Vec<Lrc<QueryWaiter<'tcx>>>,
     tcx: TyCtxt<'_, 'tcx, '_>
 ) -> bool {
-    let mut visited = HashSet::new();
+    let mut visited = FxHashSet::default();
     let mut stack = Vec::new();
     // Look for a cycle starting with the last query in `jobs`
     if let Some(waiter) = cycle_check(jobs.pop().unwrap(),
@@ -389,7 +390,7 @@ fn remove_cycle<'tcx>(
         // connected to queries outside the cycle
         let entry_points: Vec<Lrc<QueryJob<'tcx>>> = stack.iter().filter_map(|query| {
             // Mark all the other queries in the cycle as already visited
-            let mut visited = HashSet::from_iter(stack.iter().filter_map(|q| {
+            let mut visited = FxHashSet::from_iter(stack.iter().filter_map(|q| {
                 if q.1.as_ptr() != query.1.as_ptr() {
                     Some(q.1.as_ptr())
                 } else {

src/librustc/util/time_graph.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::collections::HashMap;
+use rustc_data_structures::fx::FxHashMap;
 use std::fs::File;
 use std::io::prelude::*;
 use std::marker::PhantomData;
@@ -40,7 +40,7 @@ struct PerThread {
 
 #[derive(Clone)]
 pub struct TimeGraph {
-    data: Arc<Mutex<HashMap<TimelineId, PerThread>>>,
+    data: Arc<Mutex<FxHashMap<TimelineId, PerThread>>>,
 }
 
 #[derive(Clone, Copy)]
@@ -68,7 +68,7 @@ impl Drop for RaiiToken {
 impl TimeGraph {
     pub fn new() -> TimeGraph {
         TimeGraph {
-            data: Arc::new(Mutex::new(HashMap::new()))
+            data: Arc::new(Mutex::new(FxHashMap::default()))
         }
     }
 

src/librustc_codegen_llvm/back/linker.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::collections::HashMap;
+use rustc_data_structures::fx::FxHashMap;
 use std::ffi::{OsStr, OsString};
 use std::fs::{self, File};
 use std::io::prelude::*;
@@ -30,7 +30,7 @@ use serialize::{json, Encoder};
 /// For all the linkers we support, and information they might
 /// need out of the shared crate context before we get rid of it.
 pub struct LinkerInfo {
-    exports: HashMap<CrateType, Vec<String>>,
+    exports: FxHashMap<CrateType, Vec<String>>,
 }
 
 impl LinkerInfo {

src/librustc_codegen_llvm/back/rpath.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::collections::HashSet;
+use rustc_data_structures::fx::FxHashSet;
 use std::env;
 use std::path::{Path, PathBuf};
 use std::fs;
@@ -172,7 +172,7 @@ fn get_install_prefix_rpath(config: &mut RPathConfig) -> String {
 }
 
 fn minimize_rpaths(rpaths: &[String]) -> Vec<String> {
-    let mut set = HashSet::new();
+    let mut set = FxHashSet::default();
     let mut minimized = Vec::new();
     for rpath in rpaths {
         if set.insert(rpath) {

src/librustc_data_structures/graph/test.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::collections::HashMap;
+use fx::FxHashMap;
 use std::cmp::max;
 use std::slice;
 use std::iter;
@@ -18,17 +18,17 @@ use super::*;
 pub struct TestGraph {
     num_nodes: usize,
     start_node: usize,
-    successors: HashMap<usize, Vec<usize>>,
-    predecessors: HashMap<usize, Vec<usize>>,
+    successors: FxHashMap<usize, Vec<usize>>,
+    predecessors: FxHashMap<usize, Vec<usize>>,
 }
 
 impl TestGraph {
     pub fn new(start_node: usize, edges: &[(usize, usize)]) -> Self {
         let mut graph = TestGraph {
             num_nodes: start_node + 1,
             start_node,
-            successors: HashMap::new(),
-            predecessors: HashMap::new(),
+            successors: FxHashMap::default(),
+            predecessors: FxHashMap::default(),
         };
         for &(source, target) in edges {
             graph.num_nodes = max(graph.num_nodes, source + 1);

src/librustc_driver/profile/trace.rs

@@ -10,10 +10,10 @@
 
 use super::*;
 use syntax_pos::SpanData;
+use rustc_data_structures::fx::FxHashMap;
 use rustc::util::common::QueryMsg;
 use std::fs::File;
 use std::time::{Duration, Instant};
-use std::collections::hash_map::HashMap;
 use rustc::dep_graph::{DepNode};
 
 #[derive(Debug, Clone, Eq, PartialEq)]
@@ -149,7 +149,7 @@ fn write_traces_rec(file: &mut File, traces: &[Rec], total: Duration, depth: usi
     }
 }
 
-fn compute_counts_rec(counts: &mut HashMap<String,QueryMetric>, traces: &[Rec]) {
+fn compute_counts_rec(counts: &mut FxHashMap<String,QueryMetric>, traces: &[Rec]) {
     for t in traces.iter() {
         match t.effect {
             Effect::TimeBegin(ref msg) => {
@@ -200,7 +200,7 @@ fn compute_counts_rec(counts: &mut HashMap<String,QueryMetric>, traces: &[Rec])
     }
 }
 
-pub fn write_counts(count_file: &mut File, counts: &mut HashMap<String,QueryMetric>) {
+pub fn write_counts(count_file: &mut File, counts: &mut FxHashMap<String,QueryMetric>) {
     use rustc::util::common::duration_to_secs_str;
     use std::cmp::Reverse;
 
@@ -219,7 +219,7 @@ pub fn write_counts(count_file: &mut File, counts: &mut HashMap<String,QueryMetr
 
 pub fn write_traces(html_file: &mut File, counts_file: &mut File, traces: &[Rec]) {
     let capacity = traces.iter().fold(0, |acc, t| acc + 1 + t.extent.len());
-    let mut counts : HashMap<String, QueryMetric> = HashMap::with_capacity(capacity);
+    let mut counts = FxHashMap::with_capacity_and_hasher(capacity, Default::default());
     compute_counts_rec(&mut counts, traces);
     write_counts(counts_file, &mut counts);
 

src/librustc_errors/emitter.rs

@@ -16,12 +16,12 @@ use {Level, CodeSuggestion, DiagnosticBuilder, SubDiagnostic, SourceMapperDyn, D
 use snippet::{Annotation, AnnotationType, Line, MultilineAnnotation, StyledString, Style};
 use styled_buffer::StyledBuffer;
 
+use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync::Lrc;
 use atty;
 use std::borrow::Cow;
 use std::io::prelude::*;
 use std::io;
-use std::collections::HashMap;
 use std::cmp::{min, Reverse};
 use termcolor::{StandardStream, ColorChoice, ColorSpec, BufferWriter};
 use termcolor::{WriteColor, Color, Buffer};
@@ -1090,7 +1090,7 @@ impl EmitterWriter {
                                             max_line_num_len + 1);
 
                 // Contains the vertical lines' positions for active multiline annotations
-                let mut multilines = HashMap::new();
+                let mut multilines = FxHashMap::default();
 
                 // Next, output the annotate source for this file
                 for line_idx in 0..annotated_file.lines.len() {
@@ -1109,7 +1109,7 @@ impl EmitterWriter {
                                                          width_offset,
                                                          code_offset);
 
-                    let mut to_add = HashMap::new();
+                    let mut to_add = FxHashMap::default();
 
                     for (depth, style) in depths {
                         if multilines.get(&depth).is_some() {

src/librustc_errors/registry.rs

@@ -8,11 +8,11 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::collections::HashMap;
+use rustc_data_structures::fx::FxHashMap;
 
 #[derive(Clone)]
 pub struct Registry {
-    descriptions: HashMap<&'static str, &'static str>,
+    descriptions: FxHashMap<&'static str, &'static str>,
 }
 
 impl Registry {