Auto merge of rust-lang#77871 - Julian-Wollersberger:less-query-context, r=oli-obk

Make fewer types generic over QueryContext

While trying to refactor `rustc_query_system::query::QueryContext` to make it dyn-safe, I noticed some smaller things:
* QueryConfig doesn't need to be generic over QueryContext
* ~~The `kind` field on QueryJobId is unused~~
* Some unnecessary where clauses
* Many types in `job.rs` where generic over `QueryContext` but only needed `QueryContext::Query`.
  If handle_cycle_error() could be refactored to not take `error: CycleError<CTX::Query>`, all those bounds could be removed as well.

Changing `find_cycle_in_stack()` in job.rs to not take a `tcx` argument is the only functional change here. Everything else is just updating type signatures. (aka compile-error driven development ^^)

~~Currently there is a weird bug where memory usage suddenly skyrockets when running UI tests. I'll investigate that tomorrow.
A perf run probably won't make sense before that is fixed.~~

EDIT: `kind` actually is used by `Eq`, and re-adding it fixed the memory issue.

Author: bors

compiler/rustc_middle/src/ty/query/plumbing.rs

@@ -40,7 +40,8 @@ impl QueryContext for TyCtxt<'tcx> {
 
     fn try_collect_active_jobs(
         &self,
-    ) -> Option<FxHashMap<QueryJobId<Self::DepKind>, QueryJobInfo<Self>>> {
+    ) -> Option<FxHashMap<QueryJobId<Self::DepKind>, QueryJobInfo<Self::DepKind, Self::Query>>>
+    {
         self.queries.try_collect_active_jobs()
     }
 
@@ -353,7 +354,7 @@ macro_rules! define_queries_inner {
             $(pub type $name<$tcx> = $V;)*
         }
 
-        $(impl<$tcx> QueryConfig<TyCtxt<$tcx>> for queries::$name<$tcx> {
+        $(impl<$tcx> QueryConfig for queries::$name<$tcx> {
             type Key = $($K)*;
             type Value = $V;
             type Stored = <
@@ -372,7 +373,7 @@ macro_rules! define_queries_inner {
             type Cache = query_storage!([$($modifiers)*][$($K)*, $V]);
 
             #[inline(always)]
-            fn query_state<'a>(tcx: TyCtxt<$tcx>) -> &'a QueryState<TyCtxt<$tcx>, Self::Cache> {
+            fn query_state<'a>(tcx: TyCtxt<$tcx>) -> &'a QueryState<crate::dep_graph::DepKind, <TyCtxt<$tcx> as QueryContext>::Query, Self::Cache> {
                 &tcx.queries.$name
             }
 
@@ -454,7 +455,7 @@ macro_rules! define_queries_inner {
             #[inline(always)]
             #[must_use]
             pub fn $name(self, key: query_helper_param_ty!($($K)*))
-                -> <queries::$name<$tcx> as QueryConfig<TyCtxt<$tcx>>>::Stored
+                -> <queries::$name<$tcx> as QueryConfig>::Stored
             {
                 self.at(DUMMY_SP).$name(key.into_query_param())
             })*
@@ -493,7 +494,7 @@ macro_rules! define_queries_inner {
             $($(#[$attr])*
             #[inline(always)]
             pub fn $name(self, key: query_helper_param_ty!($($K)*))
-                -> <queries::$name<$tcx> as QueryConfig<TyCtxt<$tcx>>>::Stored
+                -> <queries::$name<$tcx> as QueryConfig>::Stored
             {
                 get_query::<queries::$name<'_>, _>(self.tcx, self.span, key.into_query_param())
             })*
@@ -527,7 +528,8 @@ macro_rules! define_queries_struct {
             fallback_extern_providers: Box<Providers>,
 
             $($(#[$attr])*  $name: QueryState<
-                TyCtxt<$tcx>,
+                crate::dep_graph::DepKind,
+                <TyCtxt<$tcx> as QueryContext>::Query,
                 <queries::$name<$tcx> as QueryAccessors<TyCtxt<'tcx>>>::Cache,
             >,)*
         }
@@ -548,7 +550,7 @@ macro_rules! define_queries_struct {
 
             pub(crate) fn try_collect_active_jobs(
                 &self
-            ) -> Option<FxHashMap<QueryJobId<crate::dep_graph::DepKind>, QueryJobInfo<TyCtxt<'tcx>>>> {
+            ) -> Option<FxHashMap<QueryJobId<crate::dep_graph::DepKind>, QueryJobInfo<crate::dep_graph::DepKind, <TyCtxt<$tcx> as QueryContext>::Query>>> {
                 let mut jobs = FxHashMap::default();
 
                 $(

compiler/rustc_middle/src/ty/query/profiling_support.rs

@@ -5,8 +5,7 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::profiling::SelfProfiler;
 use rustc_hir::def_id::{CrateNum, DefId, DefIndex, LocalDefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 use rustc_hir::definitions::DefPathData;
-use rustc_query_system::query::QueryCache;
-use rustc_query_system::query::QueryState;
+use rustc_query_system::query::{QueryCache, QueryContext, QueryState};
 use std::fmt::Debug;
 use std::io::Write;
 
@@ -231,7 +230,7 @@ where
 pub(super) fn alloc_self_profile_query_strings_for_query_cache<'tcx, C>(
     tcx: TyCtxt<'tcx>,
     query_name: &'static str,
-    query_state: &QueryState<TyCtxt<'tcx>, C>,
+    query_state: &QueryState<crate::dep_graph::DepKind, <TyCtxt<'tcx> as QueryContext>::Query, C>,
     string_cache: &mut QueryKeyStringCache,
 ) where
     C: QueryCache,

compiler/rustc_middle/src/ty/query/stats.rs

@@ -1,11 +1,10 @@
 use crate::ty::query::queries;
 use crate::ty::TyCtxt;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
-use rustc_query_system::query::QueryCache;
-use rustc_query_system::query::QueryState;
-use rustc_query_system::query::{QueryAccessors, QueryContext};
+use rustc_query_system::query::{QueryAccessors, QueryCache, QueryContext, QueryState};
 
 use std::any::type_name;
+use std::hash::Hash;
 use std::mem;
 #[cfg(debug_assertions)]
 use std::sync::atomic::Ordering;
@@ -38,10 +37,12 @@ struct QueryStats {
     local_def_id_keys: Option<usize>,
 }
 
-fn stats<CTX: QueryContext, C: QueryCache>(
-    name: &'static str,
-    map: &QueryState<CTX, C>,
-) -> QueryStats {
+fn stats<D, Q, C>(name: &'static str, map: &QueryState<D, Q, C>) -> QueryStats
+where
+    D: Copy + Clone + Eq + Hash,
+    Q: Clone,
+    C: QueryCache,
+{
     let mut stats = QueryStats {
         name,
         #[cfg(debug_assertions)]
@@ -127,7 +128,8 @@ macro_rules! print_stats {
 
             $($(
                 queries.push(stats::<
-                    TyCtxt<'_>,
+                    crate::dep_graph::DepKind,
+                    <TyCtxt<'_> as QueryContext>::Query,
                     <queries::$name<'_> as QueryAccessors<TyCtxt<'_>>>::Cache,
                 >(
                     stringify!($name),

compiler/rustc_query_system/src/query/caches.rs

@@ -1,12 +1,12 @@
 use crate::dep_graph::DepNodeIndex;
 use crate::query::plumbing::{QueryLookup, QueryState};
-use crate::query::QueryContext;
 
 use rustc_arena::TypedArena;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sharded::Sharded;
 use rustc_data_structures::sync::WorkerLocal;
 use std::default::Default;
+use std::fmt::Debug;
 use std::hash::Hash;
 use std::marker::PhantomData;
 
@@ -24,24 +24,24 @@ pub trait QueryStorage: Default {
 }
 
 pub trait QueryCache: QueryStorage {
-    type Key: Hash;
+    type Key: Hash + Eq + Clone + Debug;
     type Sharded: Default;
 
     /// Checks if the query is already computed and in the cache.
     /// It returns the shard index and a lock guard to the shard,
     /// which will be used if the query is not in the cache and we need
     /// to compute it.
-    fn lookup<CTX: QueryContext, R, OnHit, OnMiss>(
+    fn lookup<D, Q, R, OnHit, OnMiss>(
         &self,
-        state: &QueryState<CTX, Self>,
+        state: &QueryState<D, Q, Self>,
         key: Self::Key,
         // `on_hit` can be called while holding a lock to the query state shard.
         on_hit: OnHit,
         on_miss: OnMiss,
     ) -> R
     where
         OnHit: FnOnce(&Self::Stored, DepNodeIndex) -> R,
-        OnMiss: FnOnce(Self::Key, QueryLookup<'_, CTX, Self::Key, Self::Sharded>) -> R;
+        OnMiss: FnOnce(Self::Key, QueryLookup<'_, D, Q, Self::Key, Self::Sharded>) -> R;
 
     fn complete(
         &self,
@@ -86,21 +86,25 @@ impl<K: Eq + Hash, V: Clone> QueryStorage for DefaultCache<K, V> {
     }
 }
 
-impl<K: Eq + Hash, V: Clone> QueryCache for DefaultCache<K, V> {
+impl<K, V> QueryCache for DefaultCache<K, V>
+where
+    K: Eq + Hash + Clone + Debug,
+    V: Clone,
+{
     type Key = K;
     type Sharded = FxHashMap<K, (V, DepNodeIndex)>;
 
     #[inline(always)]
-    fn lookup<CTX: QueryContext, R, OnHit, OnMiss>(
+    fn lookup<D, Q, R, OnHit, OnMiss>(
         &self,
-        state: &QueryState<CTX, Self>,
+        state: &QueryState<D, Q, Self>,
         key: K,
         on_hit: OnHit,
         on_miss: OnMiss,
     ) -> R
     where
         OnHit: FnOnce(&V, DepNodeIndex) -> R,
-        OnMiss: FnOnce(K, QueryLookup<'_, CTX, K, Self::Sharded>) -> R,
+        OnMiss: FnOnce(K, QueryLookup<'_, D, Q, K, Self::Sharded>) -> R,
     {
         let mut lookup = state.get_lookup(&key);
         let lock = &mut *lookup.lock;
@@ -164,21 +168,24 @@ impl<'tcx, K: Eq + Hash, V: 'tcx> QueryStorage for ArenaCache<'tcx, K, V> {
     }
 }
 
-impl<'tcx, K: Eq + Hash, V: 'tcx> QueryCache for ArenaCache<'tcx, K, V> {
+impl<'tcx, K, V: 'tcx> QueryCache for ArenaCache<'tcx, K, V>
+where
+    K: Eq + Hash + Clone + Debug,
+{
     type Key = K;
     type Sharded = FxHashMap<K, &'tcx (V, DepNodeIndex)>;
 
     #[inline(always)]
-    fn lookup<CTX: QueryContext, R, OnHit, OnMiss>(
+    fn lookup<D, Q, R, OnHit, OnMiss>(
         &self,
-        state: &QueryState<CTX, Self>,
+        state: &QueryState<D, Q, Self>,
         key: K,
         on_hit: OnHit,
         on_miss: OnMiss,
     ) -> R
     where
         OnHit: FnOnce(&&'tcx V, DepNodeIndex) -> R,
-        OnMiss: FnOnce(K, QueryLookup<'_, CTX, K, Self::Sharded>) -> R,
+        OnMiss: FnOnce(K, QueryLookup<'_, D, Q, K, Self::Sharded>) -> R,
     {
         let mut lookup = state.get_lookup(&key);
         let lock = &mut *lookup.lock;

compiler/rustc_query_system/src/query/config.rs

@@ -12,9 +12,7 @@ use std::borrow::Cow;
 use std::fmt::Debug;
 use std::hash::Hash;
 
-// The parameter `CTX` is required in librustc_middle:
-// implementations may need to access the `'tcx` lifetime in `CTX = TyCtxt<'tcx>`.
-pub trait QueryConfig<CTX> {
+pub trait QueryConfig {
     const NAME: &'static str;
     const CATEGORY: ProfileCategory;
 
@@ -70,15 +68,15 @@ impl<CTX: QueryContext, K, V> QueryVtable<CTX, K, V> {
     }
 }
 
-pub trait QueryAccessors<CTX: QueryContext>: QueryConfig<CTX> {
+pub trait QueryAccessors<CTX: QueryContext>: QueryConfig {
     const ANON: bool;
     const EVAL_ALWAYS: bool;
     const DEP_KIND: CTX::DepKind;
 
     type Cache: QueryCache<Key = Self::Key, Stored = Self::Stored, Value = Self::Value>;
 
     // Don't use this method to access query results, instead use the methods on TyCtxt
-    fn query_state<'a>(tcx: CTX) -> &'a QueryState<CTX, Self::Cache>;
+    fn query_state<'a>(tcx: CTX) -> &'a QueryState<CTX::DepKind, CTX::Query, Self::Cache>;
 
     fn to_dep_node(tcx: CTX, key: &Self::Key) -> DepNode<CTX::DepKind>
     where