Don't require a QueryContext to access the DepGraph.

compiler/rustc_middle/src/dep_graph/mod.rs

@@ -111,6 +111,11 @@ impl<'tcx> DepContext for TyCtxt<'tcx> {
             || self.sess.opts.debugging_opts.query_dep_graph
     }
 
+    #[inline]
+    fn dep_graph(&self) -> &DepGraph {
+        &self.dep_graph
+    }
+
     fn try_force_from_dep_node(&self, dep_node: &DepNode) -> bool {
         // FIXME: This match is just a workaround for incremental bugs and should
         // be removed. https://github.com/rust-lang/rust/issues/62649 is one such

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

@@ -2,7 +2,6 @@
 //! generate the actual methods on tcx which find and execute the provider,
 //! manage the caches, and so forth.
 
-use crate::dep_graph::DepGraph;
 use crate::ty::query::Query;
 use crate::ty::tls::{self, ImplicitCtxt};
 use crate::ty::{self, TyCtxt};
@@ -30,10 +29,6 @@ impl QueryContext for TyCtxt<'tcx> {
         TyCtxt::def_path_str(*self, def_id)
     }
 
-    fn dep_graph(&self) -> &DepGraph {
-        &self.dep_graph
-    }
-
     fn current_query_job(&self) -> Option<QueryJobId<Self::DepKind>> {
         tls::with_related_context(*self, |icx| icx.query)
     }

compiler/rustc_query_system/src/cache.rs

@@ -1,7 +1,6 @@
 //! Cache for candidate selection.
 
-use crate::dep_graph::DepNodeIndex;
+use crate::dep_graph::{DepContext, DepNodeIndex};
-use crate::query::QueryContext;
 
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync::HashMapExt;
@@ -28,7 +27,7 @@ impl<Key, Value> Cache<Key, Value> {
 }
 
 impl<Key: Eq + Hash, Value: Clone> Cache<Key, Value> {
-    pub fn get<CTX: QueryContext>(&self, key: &Key, tcx: CTX) -> Option<Value> {
+    pub fn get<CTX: DepContext>(&self, key: &Key, tcx: CTX) -> Option<Value> {
         Some(self.hashmap.borrow().get(key)?.get(tcx))
     }
 
@@ -55,7 +54,7 @@ impl<T: Clone> WithDepNode<T> {
         WithDepNode { dep_node, cached_value }
     }
 
-    pub fn get<CTX: QueryContext>(&self, tcx: CTX) -> T {
+    pub fn get<CTX: DepContext>(&self, tcx: CTX) -> T {
         tcx.dep_graph().read_index(self.dep_node);
         self.cached_value.clone()
     }

compiler/rustc_query_system/src/dep_graph/dep_node.rs

@@ -79,7 +79,7 @@ impl<K: DepKind> DepNode<K> {
 
     pub fn construct<Ctxt, Key>(tcx: Ctxt, kind: K, arg: &Key) -> DepNode<K>
     where
-        Ctxt: crate::query::QueryContext<DepKind = K>,
+        Ctxt: super::DepContext<DepKind = K>,
         Key: DepNodeParams<Ctxt>,
     {
         let hash = arg.to_fingerprint(tcx);

compiler/rustc_query_system/src/dep_graph/mod.rs

@@ -29,6 +29,9 @@ pub trait DepContext: Copy {
     fn debug_dep_tasks(&self) -> bool;
     fn debug_dep_node(&self) -> bool;
 
+    /// Access the DepGraph.
+    fn dep_graph(&self) -> &DepGraph<Self::DepKind>;
+
     /// Try to force a dep node to execute and see if it's green.
     fn try_force_from_dep_node(&self, dep_node: &DepNode<Self::DepKind>) -> bool;
 

compiler/rustc_query_system/src/query/mod.rs

@@ -14,7 +14,7 @@ pub use self::caches::{
 mod config;
 pub use self::config::{QueryAccessors, QueryConfig, QueryDescription};
 
-use crate::dep_graph::{DepContext, DepGraph};
+use crate::dep_graph::DepContext;
 use crate::query::job::QueryMap;
 
 use rustc_data_structures::stable_hasher::HashStable;
@@ -32,9 +32,6 @@ pub trait QueryContext: DepContext {
     /// Get string representation from DefPath.
     fn def_path_str(&self, def_id: DefId) -> String;
 
-    /// Access the DepGraph.
-    fn dep_graph(&self) -> &DepGraph<Self::DepKind>;
-
     /// Get the query information from the TLS context.
     fn current_query_job(&self) -> Option<QueryJobId<Self::DepKind>>;