[DO NOT MERGE] Query system experiments

compiler/rustc_middle/src/query/plumbing.rs

@@ -150,13 +150,12 @@ pub fn query_ensure<'tcx, Cache>(
     execute_query: fn(TyCtxt<'tcx>, Span, Cache::Key, QueryMode) -> Option<Cache::Value>,
     query_cache: &Cache,
     key: Cache::Key,
-    check_cache: bool,
 ) where
     Cache: QueryCache,
 {
     let key = key.into_query_param();
     if try_get_cached(tcx, query_cache, &key).is_none() {
-        execute_query(tcx, DUMMY_SP, key, QueryMode::Ensure { check_cache });
+        execute_query(tcx, DUMMY_SP, key, QueryMode::Ensure);
     }
 }
 
@@ -166,7 +165,6 @@ pub fn query_ensure_error_guaranteed<'tcx, Cache, T>(
     execute_query: fn(TyCtxt<'tcx>, Span, Cache::Key, QueryMode) -> Option<Cache::Value>,
     query_cache: &Cache,
     key: Cache::Key,
-    check_cache: bool,
 ) -> Result<(), ErrorGuaranteed>
 where
     Cache: QueryCache<Value = super::erase::Erase<Result<T, ErrorGuaranteed>>>,
@@ -176,7 +174,7 @@ where
     if let Some(res) = try_get_cached(tcx, query_cache, &key) {
         super::erase::restore(res).map(drop)
     } else {
-        execute_query(tcx, DUMMY_SP, key, QueryMode::Ensure { check_cache })
+        execute_query(tcx, DUMMY_SP, key, QueryMode::Ensure)
             .map(super::erase::restore)
             .map(|res| res.map(drop))
             // Either we actually executed the query, which means we got a full `Result`,
@@ -393,7 +391,6 @@ macro_rules! define_callbacks {
                     self.tcx.query_system.fns.engine.$name,
                     &self.tcx.query_system.caches.$name,
                     key.into_query_param(),
-                    false,
                 )
             })*
         }
@@ -402,13 +399,8 @@ macro_rules! define_callbacks {
             $($(#[$attr])*
             #[inline(always)]
             pub fn $name(self, key: query_helper_param_ty!($($K)*)) {
-                query_ensure(
-                    self.tcx,
-                    self.tcx.query_system.fns.engine.$name,
-                    &self.tcx.query_system.caches.$name,
-                    key.into_query_param(),
-                    true,
-                );
+                // Just call the query normally, and discard its result.
+                let _ = self.tcx.$name(key);
             })*
         }
 

compiler/rustc_query_system/src/query/plumbing.rs

@@ -743,12 +743,7 @@ fn incremental_verify_ich_failed<Tcx>(
 ///
 /// Note: The optimization is only available during incr. comp.
 #[inline(never)]
-fn ensure_must_run<Q, Qcx>(
-    query: Q,
-    qcx: Qcx,
-    key: &Q::Key,
-    check_cache: bool,
-) -> (bool, Option<DepNode>)
+fn ensure_must_run<Q, Qcx>(query: Q, qcx: Qcx, key: &Q::Key) -> (bool, Option<DepNode>)
 where
     Q: QueryConfig<Qcx>,
     Qcx: QueryContext,
@@ -763,7 +758,7 @@ where
     let dep_node = query.construct_dep_node(*qcx.dep_context(), key);
 
     let dep_graph = qcx.dep_context().dep_graph();
-    let serialized_dep_node_index = match dep_graph.try_mark_green(qcx, &dep_node) {
+    match dep_graph.try_mark_green(qcx, &dep_node) {
         None => {
             // A None return from `try_mark_green` means that this is either
             // a new dep node or that the dep node has already been marked red.
@@ -773,26 +768,17 @@ where
             // in-memory cache, or another query down the line will.
             return (true, Some(dep_node));
         }
-        Some((serialized_dep_node_index, dep_node_index)) => {
-            dep_graph.read_index(dep_node_index);
-            qcx.dep_context().profiler().query_cache_hit(dep_node_index.into());
-            serialized_dep_node_index
-        }
+        Some(_) => {}
     };
 
     // We do not need the value at all, so do not check the cache.
-    if !check_cache {
-        return (false, None);
-    }
-
-    let loadable = query.loadable_from_disk(qcx, key, serialized_dep_node_index);
-    (!loadable, Some(dep_node))
+    (false, None)
 }
 
 #[derive(Debug)]
 pub enum QueryMode {
     Get,
-    Ensure { check_cache: bool },
+    Ensure,
 }
 
 #[inline(always)]
@@ -820,19 +806,18 @@ where
 {
     debug_assert!(qcx.dep_context().dep_graph().is_fully_enabled());
 
-    let dep_node = if let QueryMode::Ensure { check_cache } = mode {
-        let (must_run, dep_node) = ensure_must_run(query, qcx, &key, check_cache);
-        if !must_run {
-            return None;
+    match mode {
+        QueryMode::Ensure => {
+            let (must_run, _) = ensure_must_run(query, qcx, &key);
+            if !must_run {
+                return None;
+            }
         }
-        dep_node
-    } else {
-        None
-    };
+        QueryMode::Get => {}
+    }
 
-    let (result, dep_node_index) = ensure_sufficient_stack(|| {
-        try_execute_query::<_, _, true>(query, qcx, span, key, dep_node)
-    });
+    let (result, dep_node_index) =
+        ensure_sufficient_stack(|| try_execute_query::<_, _, true>(query, qcx, span, key, None));
     if let Some(dep_node_index) = dep_node_index {
         qcx.dep_context().dep_graph().read_index(dep_node_index)
     }