Make -Z time-passes less noisy

- Add the module name to `pre_AST_expansion_passes` and don't make it a
  verbose event (since it normally doesn't take very long, and it's
  emitted many times)
- Don't make the following rustdoc events verbose; they're emitted many times.
  + build_extern_trait_impl
  + build_local_trait_impl
  + build_primitive_trait_impl
  + get_auto_trait_impls
  + get_blanket_trait_impls
- Remove `get_auto_trait_and_blanket_synthetic_impls`; it's wholly
  covered by get_{auto,blanket}_trait_impls and not very useful.

compiler/rustc_expand/src/base.rs

@@ -929,7 +929,9 @@ pub struct ExtCtxt<'a> {
     pub force_mode: bool,
     pub expansions: FxHashMap<Span, Vec<String>>,
     /// Called directly after having parsed an external `mod foo;` in expansion.
-    pub(super) extern_mod_loaded: Option<&'a dyn Fn(&ast::Crate)>,
+    ///
+    /// `Ident` is the module name.
+    pub(super) extern_mod_loaded: Option<&'a dyn Fn(&ast::Crate, Ident)>,
 }
 
 impl<'a> ExtCtxt<'a> {
@@ -937,7 +939,7 @@ impl<'a> ExtCtxt<'a> {
         sess: &'a Session,
         ecfg: expand::ExpansionConfig<'a>,
         resolver: &'a mut dyn ResolverExpand,
-        extern_mod_loaded: Option<&'a dyn Fn(&ast::Crate)>,
+        extern_mod_loaded: Option<&'a dyn Fn(&ast::Crate, Ident)>,
     ) -> ExtCtxt<'a> {
         ExtCtxt {
             sess,

compiler/rustc_expand/src/expand.rs

@@ -1407,7 +1407,7 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
                         proc_macros: vec![],
                     };
                     if let Some(extern_mod_loaded) = self.cx.extern_mod_loaded {
-                        extern_mod_loaded(&krate);
+                        extern_mod_loaded(&krate, ident);
                     }
 
                     *old_mod = krate.module;

compiler/rustc_interface/src/passes.rs

@@ -33,7 +33,7 @@ use rustc_session::lint;
 use rustc_session::output::{filename_for_input, filename_for_metadata};
 use rustc_session::search_paths::PathKind;
 use rustc_session::Session;
-use rustc_span::symbol::Symbol;
+use rustc_span::symbol::{Ident, Symbol};
 use rustc_span::{FileName, RealFileName};
 use rustc_trait_selection::traits;
 use rustc_typeck as typeck;
@@ -211,8 +211,13 @@ pub fn register_plugins<'a>(
     Ok((krate, lint_store))
 }
 
-fn pre_expansion_lint(sess: &Session, lint_store: &LintStore, krate: &ast::Crate) {
+fn pre_expansion_lint(
-    sess.time("pre_AST_expansion_lint_checks", || {
+    sess: &Session,
+    lint_store: &LintStore,
+    krate: &ast::Crate,
+    crate_name: &str,
+) {
+    sess.prof.generic_activity_with_arg("pre_AST_expansion_lint_checks", crate_name).run(|| {
         rustc_lint::check_ast_crate(
             sess,
             lint_store,
@@ -233,7 +238,7 @@ fn configure_and_expand_inner<'a>(
     metadata_loader: &'a MetadataLoaderDyn,
 ) -> Result<(ast::Crate, Resolver<'a>)> {
     tracing::trace!("configure_and_expand_inner");
-    pre_expansion_lint(sess, lint_store, &krate);
+    pre_expansion_lint(sess, lint_store, &krate, crate_name);
 
     let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
     rustc_builtin_macros::register_builtin_macros(&mut resolver);
@@ -295,7 +300,9 @@ fn configure_and_expand_inner<'a>(
             ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
         };
 
-        let extern_mod_loaded = |k: &ast::Crate| pre_expansion_lint(sess, lint_store, k);
+        let extern_mod_loaded = |k: &ast::Crate, ident: Ident| {
+            pre_expansion_lint(sess, lint_store, k, &*ident.name.as_str())
+        };
         let mut ecx = ExtCtxt::new(&sess, cfg, &mut resolver, Some(&extern_mod_loaded));
 
         // Expand macros now!

src/librustdoc/clean/utils.rs

@@ -487,12 +487,16 @@ crate fn get_auto_trait_and_blanket_impls(
     ty: Ty<'tcx>,
     param_env_def_id: DefId,
 ) -> impl Iterator<Item = Item> {
-    let auto_impls = cx.sess().time("get_auto_trait_impls", || {
+    let auto_impls = cx
-        AutoTraitFinder::new(cx).get_auto_trait_impls(ty, param_env_def_id)
+        .sess()
-    });
+        .prof
-    let blanket_impls = cx.sess().time("get_blanket_impls", || {
+        .generic_activity("get_auto_trait_impls")
-        BlanketImplFinder::new(cx).get_blanket_impls(ty, param_env_def_id)
+        .run(|| AutoTraitFinder::new(cx).get_auto_trait_impls(ty, param_env_def_id));
-    });
+    let blanket_impls = cx
+        .sess()
+        .prof
+        .generic_activity("get_blanket_impls")
+        .run(|| BlanketImplFinder::new(cx).get_blanket_impls(ty, param_env_def_id));
     auto_impls.into_iter().chain(blanket_impls)
 }
 

src/librustdoc/passes/collect_trait_impls.rs

@@ -30,7 +30,7 @@ crate fn collect_trait_impls(krate: Crate, cx: &DocContext<'_>) -> Crate {
 
     for &cnum in cx.tcx.crates().iter() {
         for &(did, _) in cx.tcx.all_trait_implementations(cnum).iter() {
-            cx.tcx.sess.time("build_extern_trait_impl", || {
+            cx.tcx.sess.prof.generic_activity("build_extern_trait_impl").run(|| {
                 inline::build_impl(cx, None, did, None, &mut new_items);
             });
         }
@@ -39,7 +39,7 @@ crate fn collect_trait_impls(krate: Crate, cx: &DocContext<'_>) -> Crate {
     // Also try to inline primitive impls from other crates.
     for &def_id in PrimitiveType::all_impls(cx.tcx).values().flatten() {
         if !def_id.is_local() {
-            cx.sess().time("build_primitive_trait_impl", || {
+            cx.tcx.sess.prof.generic_activity("build_primitive_trait_impls").run(|| {
                 inline::build_impl(cx, None, def_id, None, &mut new_items);
 
                 // FIXME(eddyb) is this `doc(hidden)` check needed?
@@ -59,7 +59,7 @@ crate fn collect_trait_impls(krate: Crate, cx: &DocContext<'_>) -> Crate {
     for &trait_did in cx.tcx.all_traits(LOCAL_CRATE).iter() {
         for &impl_node in cx.tcx.hir().trait_impls(trait_did) {
             let impl_did = cx.tcx.hir().local_def_id(impl_node);
-            cx.tcx.sess.time("build_local_trait_impl", || {
+            cx.tcx.sess.prof.generic_activity("build_local_trait_impl").run(|| {
                 let mut extra_attrs = Vec::new();
                 let mut parent = cx.tcx.parent(impl_did.to_def_id());
                 while let Some(did) = parent {
@@ -177,13 +177,11 @@ impl<'a, 'tcx> DocFolder for SyntheticImplCollector<'a, 'tcx> {
         if i.is_struct() || i.is_enum() || i.is_union() {
             // FIXME(eddyb) is this `doc(hidden)` check needed?
             if !self.cx.tcx.get_attrs(i.def_id).lists(sym::doc).has_word(sym::hidden) {
-                self.cx.sess().time("get_auto_trait_and_blanket_synthetic_impls", || {
+                self.impls.extend(get_auto_trait_and_blanket_impls(
-                    self.impls.extend(get_auto_trait_and_blanket_impls(
+                    self.cx,
-                        self.cx,
+                    self.cx.tcx.type_of(i.def_id),
-                        self.cx.tcx.type_of(i.def_id),
+                    i.def_id,
-                        i.def_id,
+                ));
-                    ));
-                });
             }
         }