Enable tracing for all queryies

Cargo.lock

@@ -4244,6 +4244,7 @@ dependencies = [
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
+ "tracing",
 ]
 
 [[package]]

compiler/rustc_query_impl/Cargo.toml

@@ -20,6 +20,7 @@ rustc_query_system = { path = "../rustc_query_system" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
+tracing = "0.1"
 
 [features]
 rustc_use_parallel_compiler = ["rustc-rayon-core", "rustc_query_system/rustc_use_parallel_compiler"]

compiler/rustc_query_impl/src/plumbing.rs

@@ -435,6 +435,8 @@ macro_rules! define_queries {
 
                 fn force_from_dep_node(tcx: TyCtxt<'_>, dep_node: DepNode) -> bool {
                     if let Some(key) = recover(tcx, dep_node) {
+                        #[cfg(debug_assertions)]
+                        let _guard = tracing::span!(tracing::Level::TRACE, stringify!($name), ?key).entered();
                         let tcx = QueryCtxt::from_tcx(tcx);
                         force_query::<queries::$name<'_>, _>(tcx, key, dep_node);
                         true
@@ -532,6 +534,7 @@ macro_rules! define_queries_struct {
 
             $($(#[$attr])*
             #[inline(always)]
+            #[tracing::instrument(level = "trace", skip(self, tcx))]
             fn $name(
                 &'tcx self,
                 tcx: TyCtxt<$tcx>,

compiler/rustc_query_system/src/query/plumbing.rs

@@ -675,6 +675,7 @@ where
     }
 }
 
+#[derive(Debug)]
 pub enum QueryMode {
     Get,
     Ensure,
@@ -697,7 +698,6 @@ where
         None
     };
 
-    debug!("ty::query::get_query<{}>(key={:?}, span={:?})", Q::NAME, key, span);
     let (result, dep_node_index) = try_execute_query(
         tcx,
         Q::query_state(tcx),