Move self-profile infrastructure to data structures

The single dependency on queries (QueryName) can be fairly easily
abstracted via a trait and this further decouples Session from librustc
(the primary goal).

Author: Mark-Simulacrum

Cargo.lock

@@ -3120,7 +3120,6 @@ dependencies = [
  "graphviz",
  "jobserver",
  "log",
- "measureme",
  "num_cpus",
  "parking_lot 0.9.0",
  "polonius-engine",
@@ -3470,6 +3469,7 @@ dependencies = [
 name = "rustc_data_structures"
 version = "0.0.0"
 dependencies = [
+ "bitflags",
  "cfg-if",
  "crossbeam-utils 0.6.5",
  "ena",
@@ -3478,6 +3478,7 @@ dependencies = [
  "jobserver",
  "lazy_static 1.3.0",
  "log",
+ "measureme",
  "parking_lot 0.9.0",
  "rustc-hash",
  "rustc-rayon 0.3.0",

src/librustc/Cargo.toml

@@ -40,4 +40,3 @@ byteorder = { version = "1.3" }
 chalk-engine = { version = "0.9.0", default-features=false }
 rustc_fs_util = { path = "../librustc_fs_util" }
 smallvec = { version = "1.0", features = ["union", "may_dangle"] }
-measureme = "0.4"

src/librustc/lib.rs

@@ -126,7 +126,6 @@ pub mod util {
     pub mod captures;
     pub mod common;
     pub mod nodemap;
-    pub mod profiling;
     pub mod bug;
 }
 

src/librustc/session/mod.rs

@@ -29,11 +29,11 @@ use syntax::source_map;
 use syntax::sess::{ParseSess, ProcessCfgMod};
 use syntax::symbol::Symbol;
 use syntax_pos::{MultiSpan, Span};
-use crate::util::profiling::{SelfProfiler, SelfProfilerRef};
 
 use rustc_target::spec::{PanicStrategy, RelroLevel, Target, TargetTriple};
 use rustc_data_structures::flock;
 use rustc_data_structures::jobserver;
+use rustc_data_structures::profiling::{SelfProfiler, SelfProfilerRef};
 use ::jobserver::Client;
 
 use std;

src/librustc/ty/context.rs

@@ -46,11 +46,11 @@ use crate::ty::CanonicalPolyFnSig;
 use crate::util::common::ErrorReported;
 use crate::util::nodemap::{DefIdMap, DefIdSet, ItemLocalMap, ItemLocalSet, NodeMap};
 use crate::util::nodemap::{FxHashMap, FxHashSet};
-use crate::util::profiling::SelfProfilerRef;
 
 use errors::DiagnosticBuilder;
 use arena::SyncDroplessArena;
 use smallvec::SmallVec;
+use rustc_data_structures::profiling::SelfProfilerRef;
 use rustc_data_structures::stable_hasher::{
     HashStable, StableHasher, StableVec, hash_stable_hashmap,
 };

src/librustc/ty/query/config.rs

@@ -6,7 +6,7 @@ use crate::ty::query::queries;
 use crate::ty::query::{Query, QueryName};
 use crate::ty::query::QueryCache;
 use crate::ty::query::plumbing::CycleError;
-use crate::util::profiling::ProfileCategory;
+use rustc_data_structures::profiling::ProfileCategory;
 
 use std::borrow::Cow;
 use std::hash::Hash;

src/librustc/ty/query/mod.rs

@@ -39,7 +39,7 @@ use crate::ty::util::NeedsDrop;
 use crate::ty::subst::SubstsRef;
 use crate::util::nodemap::{DefIdSet, DefIdMap};
 use crate::util::common::ErrorReported;
-use crate::util::profiling::ProfileCategory::*;
+use rustc_data_structures::profiling::ProfileCategory::*;
 
 use rustc_data_structures::svh::Svh;
 use rustc_index::vec::IndexVec;

src/librustc/ty/query/plumbing.rs

@@ -672,7 +672,7 @@ macro_rules! define_queries_inner {
             rustc_data_structures::stable_hasher::StableHasher,
             ich::StableHashingContext
         };
-        use crate::util::profiling::ProfileCategory;
+        use rustc_data_structures::profiling::ProfileCategory;
 
         define_queries_struct! {
             tcx: $tcx,
@@ -816,8 +816,18 @@ macro_rules! define_queries_inner {
             $($name),*
         }
 
+        impl rustc_data_structures::profiling::QueryName for QueryName {
+            fn discriminant(self) -> std::mem::Discriminant<QueryName> {
+                std::mem::discriminant(&self)
+            }
+
+            fn as_str(self) -> &'static str {
+                QueryName::as_str(&self)
+            }
+        }
+
         impl QueryName {
-            pub fn register_with_profiler(profiler: &crate::util::profiling::SelfProfiler) {
+            pub fn register_with_profiler(profiler: &rustc_data_structures::profiling::SelfProfiler) {
                 $(profiler.register_query_name(QueryName::$name);)*
             }
 

src/librustc_codegen_ssa/back/write.rs

@@ -19,7 +19,7 @@ use rustc::util::nodemap::FxHashMap;
 use rustc::hir::def_id::{CrateNum, LOCAL_CRATE};
 use rustc::ty::TyCtxt;
 use rustc::util::common::{time_depth, set_time_depth, print_time_passes_entry};
-use rustc::util::profiling::SelfProfilerRef;
+use rustc_data_structures::profiling::SelfProfilerRef;
 use rustc_fs_util::link_or_copy;
 use rustc_data_structures::svh::Svh;
 use rustc_data_structures::sync::Lrc;

src/librustc_data_structures/Cargo.toml

@@ -25,6 +25,8 @@ rayon-core = { version = "0.3.0", package = "rustc-rayon-core" }
 rustc-hash = "1.0.1"
 smallvec = { version = "1.0", features = ["union", "may_dangle"] }
 rustc_index = { path = "../librustc_index", package = "rustc_index" }
+bitflags = "1.2.1"
+measureme = "0.4"
 
 [dependencies.parking_lot]
 version = "0.9"

src/librustc_data_structures/lib.rs

@@ -94,6 +94,7 @@ pub use ena::unify;
 pub mod vec_linked_list;
 pub mod work_queue;
 pub mod fingerprint;
+pub mod profiling;
 
 pub struct OnDrop<F: Fn()>(pub F);
 

src/librustc/util/profiling.rs renamed to src/librustc_data_structures/profiling.rs

@@ -7,8 +7,6 @@ use std::sync::Arc;
 use std::thread::ThreadId;
 use std::u32;
 
-use crate::ty::query::QueryName;
-
 use measureme::{StringId, TimestampKind};
 
 /// MmapSerializatioSink is faster on macOS and Linux
@@ -20,6 +18,10 @@ type SerializationSink = measureme::FileSerializationSink;
 
 type Profiler = measureme::Profiler<SerializationSink>;
 
+pub trait QueryName: Sized + Copy {
+    fn discriminant(self) -> Discriminant<Self>;
+    fn as_str(self) -> &'static str;
+}
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Ord, PartialOrd)]
 pub enum ProfileCategory {
@@ -32,7 +34,7 @@ pub enum ProfileCategory {
     Other,
 }
 
-bitflags! {
+bitflags::bitflags! {
     struct EventFilter: u32 {
         const GENERIC_ACTIVITIES = 1 << 0;
         const QUERY_PROVIDERS    = 1 << 1;
@@ -137,7 +139,7 @@ impl SelfProfilerRef {
     /// Start profiling a query provider. Profiling continues until the
     /// TimingGuard returned from this call is dropped.
     #[inline(always)]
-    pub fn query_provider(&self, query_name: QueryName) -> TimingGuard<'_> {
+    pub fn query_provider(&self, query_name: impl QueryName) -> TimingGuard<'_> {
         self.exec(EventFilter::QUERY_PROVIDERS, |profiler| {
             let event_id = SelfProfiler::get_query_name_string_id(query_name);
             TimingGuard::start(profiler, profiler.query_event_kind, event_id)
@@ -146,7 +148,7 @@ impl SelfProfilerRef {
 
     /// Record a query in-memory cache hit.
     #[inline(always)]
-    pub fn query_cache_hit(&self, query_name: QueryName) {
+    pub fn query_cache_hit(&self, query_name: impl QueryName) {
         self.non_guard_query_event(
             |profiler| profiler.query_cache_hit_event_kind,
             query_name,
@@ -159,7 +161,7 @@ impl SelfProfilerRef {
     /// Profiling continues until the TimingGuard returned from this call is
     /// dropped.
     #[inline(always)]
-    pub fn query_blocked(&self, query_name: QueryName) -> TimingGuard<'_> {
+    pub fn query_blocked(&self, query_name: impl QueryName) -> TimingGuard<'_> {
         self.exec(EventFilter::QUERY_BLOCKED, |profiler| {
             let event_id = SelfProfiler::get_query_name_string_id(query_name);
             TimingGuard::start(profiler, profiler.query_blocked_event_kind, event_id)
@@ -170,7 +172,7 @@ impl SelfProfilerRef {
     /// incremental compilation on-disk cache. Profiling continues until the
     /// TimingGuard returned from this call is dropped.
     #[inline(always)]
-    pub fn incr_cache_loading(&self, query_name: QueryName) -> TimingGuard<'_> {
+    pub fn incr_cache_loading(&self, query_name: impl QueryName) -> TimingGuard<'_> {
         self.exec(EventFilter::INCR_CACHE_LOADS, |profiler| {
             let event_id = SelfProfiler::get_query_name_string_id(query_name);
             TimingGuard::start(
@@ -185,7 +187,7 @@ impl SelfProfilerRef {
     fn non_guard_query_event(
         &self,
         event_kind: fn(&SelfProfiler) -> StringId,
-        query_name: QueryName,
+        query_name: impl QueryName,
         event_filter: EventFilter,
         timestamp_kind: TimestampKind
     ) {
@@ -274,15 +276,15 @@ impl SelfProfiler {
         })
     }
 
-    fn get_query_name_string_id(query_name: QueryName) -> StringId {
+    fn get_query_name_string_id(query_name: impl QueryName) -> StringId {
         let discriminant = unsafe {
-            mem::transmute::<Discriminant<QueryName>, u64>(mem::discriminant(&query_name))
+            mem::transmute::<Discriminant<_>, u64>(query_name.discriminant())
         };
 
         StringId::reserved(discriminant as u32)
     }
 
-    pub fn register_query_name(&self, query_name: QueryName) {
+    pub fn register_query_name(&self, query_name: impl QueryName) {
         let id = SelfProfiler::get_query_name_string_id(query_name);
         self.profiler.alloc_string_with_reserved_id(id, query_name.as_str());
     }