tracing::instrument cleanup

Author: oli-obk

compiler/rustc_borrowck/src/region_infer/mod.rs

@@ -1139,7 +1139,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     ///   include the CFG anyhow.
     /// - For each `end('x)` element in `'r`, compute the mutual LUB, yielding
     ///   a result `'y`.
-    #[instrument(skip(self), level = "debug")]
+    #[instrument(skip(self), level = "debug", ret)]
     pub(crate) fn universal_upper_bound(&self, r: RegionVid) -> RegionVid {
         debug!(r = %self.region_value_str(r));
 
@@ -1151,8 +1151,6 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             lub = self.universal_region_relations.postdom_upper_bound(lub, ur);
         }
 
-        debug!(?lub);
-
         lub
     }
 
@@ -1333,15 +1331,15 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     }
 
     // Evaluate whether `sup_region: sub_region`.
-    #[instrument(skip(self), level = "debug")]
+    #[instrument(skip(self), level = "debug", ret)]
     fn eval_outlives(&self, sup_region: RegionVid, sub_region: RegionVid) -> bool {
         debug!(
-            "eval_outlives: sup_region's value = {:?} universal={:?}",
+            "sup_region's value = {:?} universal={:?}",
             self.region_value_str(sup_region),
             self.universal_regions.is_universal_region(sup_region),
         );
         debug!(
-            "eval_outlives: sub_region's value = {:?} universal={:?}",
+            "sub_region's value = {:?} universal={:?}",
             self.region_value_str(sub_region),
             self.universal_regions.is_universal_region(sub_region),
         );
@@ -1354,7 +1352,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         // true if `'sup` outlives static.
         if !self.universe_compatible(sub_region_scc, sup_region_scc) {
             debug!(
-                "eval_outlives: sub universe `{sub_region_scc:?}` is not nameable \
+                "sub universe `{sub_region_scc:?}` is not nameable \
                 by super `{sup_region_scc:?}`, promoting to static",
             );
 
@@ -1375,9 +1373,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             });
 
         if !universal_outlives {
-            debug!(
-                "eval_outlives: returning false because sub region contains a universal region not present in super"
-            );
+            debug!("sub region contains a universal region not present in super");
             return false;
         }
 
@@ -1386,15 +1382,13 @@ impl<'tcx> RegionInferenceContext<'tcx> {
 
         if self.universal_regions.is_universal_region(sup_region) {
             // Micro-opt: universal regions contain all points.
-            debug!(
-                "eval_outlives: returning true because super is universal and hence contains all points"
-            );
+            debug!("super is universal and hence contains all points");
             return true;
         }
 
-        let result = self.scc_values.contains_points(sup_region_scc, sub_region_scc);
-        debug!("returning {} because of comparison between points in sup/sub", result);
-        result
+        debug!("comparison between points in sup/sub");
+
+        self.scc_values.contains_points(sup_region_scc, sub_region_scc)
     }
 
     /// Once regions have been propagated, this method is used to see
@@ -1971,7 +1965,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     }
 
     /// Finds some region R such that `fr1: R` and `R` is live at `elem`.
-    #[instrument(skip(self), level = "trace")]
+    #[instrument(skip(self), level = "trace", ret)]
     pub(crate) fn find_sub_region_live_at(&self, fr1: RegionVid, elem: Location) -> RegionVid {
         trace!(scc = ?self.constraint_sccs.scc(fr1));
         trace!(universe = ?self.scc_universes[self.constraint_sccs.scc(fr1)]);

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -60,7 +60,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// Calling `universal_upper_bound` for such a region gives `fr_fn_body`,
     /// which has no `external_name` in which case we use `'empty` as the
     /// region to pass to `infer_opaque_definition_from_instantiation`.
-    #[instrument(level = "debug", skip(self, infcx))]
+    #[instrument(level = "debug", skip(self, infcx), ret)]
     pub(crate) fn infer_opaque_types(
         &self,
         infcx: &InferCtxt<'_, 'tcx>,

compiler/rustc_borrowck/src/universal_regions.rs

@@ -768,10 +768,9 @@ impl<'cx, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'cx, 'tcx> {
         mir_def_id: LocalDefId,
         indices: &mut UniversalRegionIndices<'tcx>,
     ) {
-        debug!("replace_late_bound_regions_with_nll_infer_vars(mir_def_id={:?})", mir_def_id);
         let typeck_root_def_id = self.tcx.typeck_root_def_id(mir_def_id.to_def_id());
         for_each_late_bound_region_defined_on(self.tcx, typeck_root_def_id, |r| {
-            debug!("replace_late_bound_regions_with_nll_infer_vars: r={:?}", r);
+            debug!(?r);
             if !indices.indices.contains_key(&r) {
                 let region_vid = self.next_nll_region_var(FR);
                 debug!(?region_vid);

compiler/rustc_const_eval/src/const_eval/eval_queries.rs

@@ -197,7 +197,7 @@ pub(super) fn op_to_const<'tcx>(
     }
 }
 
-#[instrument(skip(tcx), level = "debug")]
+#[instrument(skip(tcx), level = "debug", ret)]
 pub(crate) fn turn_into_const_value<'tcx>(
     tcx: TyCtxt<'tcx>,
     constant: ConstAlloc<'tcx>,
@@ -224,10 +224,7 @@ pub(crate) fn turn_into_const_value<'tcx>(
     );
 
     // Turn this into a proper constant.
-    let const_val = op_to_const(&ecx, &mplace.into());
-    debug!(?const_val);
-
-    const_val
+    op_to_const(&ecx, &mplace.into())
 }
 
 #[instrument(skip(tcx), level = "debug")]

compiler/rustc_const_eval/src/const_eval/valtrees.rs

@@ -204,7 +204,7 @@ fn get_info_on_unsized_field<'tcx>(
     (unsized_inner_ty, num_elems)
 }
 
-#[instrument(skip(ecx), level = "debug")]
+#[instrument(skip(ecx), level = "debug", ret)]
 fn create_pointee_place<'tcx>(
     ecx: &mut CompileTimeEvalContext<'tcx, 'tcx>,
     ty: Ty<'tcx>,
@@ -237,14 +237,11 @@ fn create_pointee_place<'tcx>(
         let ptr = ecx.allocate_ptr(size, align, MemoryKind::Stack).unwrap();
         debug!(?ptr);
 
-        let place = MPlaceTy::from_aligned_ptr_with_meta(
+        MPlaceTy::from_aligned_ptr_with_meta(
             ptr.into(),
             layout,
             MemPlaceMeta::Meta(Scalar::from_machine_usize(num_elems as u64, &tcx)),
-        );
-        debug!(?place);
-
-        place
+        )
     } else {
         create_mplace_from_layout(ecx, ty)
     }
@@ -253,7 +250,7 @@ fn create_pointee_place<'tcx>(
 /// Converts a `ValTree` to a `ConstValue`, which is needed after mir
 /// construction has finished.
 // FIXME Merge `valtree_to_const_value` and `valtree_into_mplace` into one function
-#[instrument(skip(tcx), level = "debug")]
+#[instrument(skip(tcx), level = "debug", ret)]
 pub fn valtree_to_const_value<'tcx>(
     tcx: TyCtxt<'tcx>,
     param_env_ty: ty::ParamEnvAnd<'tcx, Ty<'tcx>>,
@@ -294,7 +291,7 @@ pub fn valtree_to_const_value<'tcx>(
             dump_place(&ecx, place.into());
             intern_const_alloc_recursive(&mut ecx, InternKind::Constant, &place).unwrap();
 
-            let const_val = match ty.kind() {
+            match ty.kind() {
                 ty::Ref(_, _, _) => {
                     let ref_place = place.to_ref(&tcx);
                     let imm =
@@ -303,10 +300,7 @@ pub fn valtree_to_const_value<'tcx>(
                     op_to_const(&ecx, &imm.into())
                 }
                 _ => op_to_const(&ecx, &place.into()),
-            };
-            debug!(?const_val);
-
-            const_val
+            }
         }
         ty::Never
         | ty::Error(_)

compiler/rustc_driver/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 crate-type = ["dylib"]
 
 [dependencies]
-tracing = { version = "0.1.28" }
+tracing = { version = "0.1.35" }
 serde_json = "1.0.59"
 rustc_log = { path = "../rustc_log" }
 rustc_middle = { path = "../rustc_middle" }

compiler/rustc_infer/src/infer/combine.rs

@@ -391,7 +391,7 @@ impl<'infcx, 'tcx> CombineFields<'infcx, 'tcx> {
     /// Preconditions:
     ///
     /// - `for_vid` is a "root vid"
-    #[instrument(skip(self), level = "trace")]
+    #[instrument(skip(self), level = "trace", ret)]
     fn generalize(
         &self,
         ty: Ty<'tcx>,
@@ -435,15 +435,8 @@ impl<'infcx, 'tcx> CombineFields<'infcx, 'tcx> {
             cache: SsoHashMap::new(),
         };
 
-        let ty = match generalize.relate(ty, ty) {
-            Ok(ty) => ty,
-            Err(e) => {
-                debug!(?e, "failure");
-                return Err(e);
-            }
-        };
+        let ty = generalize.relate(ty, ty)?;
         let needs_wf = generalize.needs_wf;
-        trace!(?ty, ?needs_wf, "success");
         Ok(Generalization { ty, needs_wf })
     }
 
@@ -499,6 +492,7 @@ struct Generalizer<'cx, 'tcx> {
 /// Result from a generalization operation. This includes
 /// not only the generalized type, but also a bool flag
 /// indicating whether further WF checks are needed.
+#[derive(Debug)]
 struct Generalization<'tcx> {
     ty: Ty<'tcx>,
 
@@ -856,10 +850,9 @@ impl<'tcx> TypeRelation<'tcx> for ConstInferUnifier<'_, 'tcx> {
         Ok(a.rebind(self.relate(a.skip_binder(), b.skip_binder())?))
     }
 
-    #[instrument(level = "debug", skip(self))]
+    #[instrument(level = "debug", skip(self), ret)]
     fn tys(&mut self, t: Ty<'tcx>, _t: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>> {
         debug_assert_eq!(t, _t);
-        debug!("ConstInferUnifier: t={:?}", t);
 
         match t.kind() {
             &ty::Infer(ty::TyVar(vid)) => {
@@ -883,12 +876,7 @@ impl<'tcx> TypeRelation<'tcx> for ConstInferUnifier<'_, 'tcx> {
                             .borrow_mut()
                             .type_variables()
                             .new_var(self.for_universe, origin);
-                        let u = self.tcx().mk_ty_var(new_var_id);
-                        debug!(
-                            "ConstInferUnifier: replacing original vid={:?} with new={:?}",
-                            vid, u
-                        );
-                        Ok(u)
+                        Ok(self.tcx().mk_ty_var(new_var_id))
                     }
                 }
             }
@@ -939,7 +927,6 @@ impl<'tcx> TypeRelation<'tcx> for ConstInferUnifier<'_, 'tcx> {
         _c: ty::Const<'tcx>,
     ) -> RelateResult<'tcx, ty::Const<'tcx>> {
         debug_assert_eq!(c, _c);
-        debug!("ConstInferUnifier: c={:?}", c);
 
         match c.kind() {
             ty::ConstKind::Infer(InferConst::Var(vid)) => {

compiler/rustc_infer/src/infer/higher_ranked/mod.rs

@@ -69,7 +69,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     /// For more details visit the relevant sections of the [rustc dev guide].
     ///
     /// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/traits/hrtb.html
-    #[instrument(level = "debug", skip(self))]
+    #[instrument(level = "debug", skip(self), ret)]
     pub fn replace_bound_vars_with_placeholders<T>(&self, binder: ty::Binder<'tcx, T>) -> T
     where
         T: TypeFoldable<'tcx> + Copy,
@@ -104,9 +104,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             },
         };
 
-        let result = self.tcx.replace_bound_vars_uncached(binder, delegate);
-        debug!(?next_universe, ?result);
-        result
+        debug!(?next_universe);
+        self.tcx.replace_bound_vars_uncached(binder, delegate)
     }
 
     /// See [RegionConstraintCollector::leak_check][1].

compiler/rustc_infer/src/infer/lexical_region_resolve/mod.rs

@@ -333,9 +333,9 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
     ///
     /// Neither `a` nor `b` may be an inference variable (hence the
     /// term "concrete regions").
-    #[instrument(level = "trace", skip(self))]
+    #[instrument(level = "trace", skip(self), ret)]
     fn lub_concrete_regions(&self, a: Region<'tcx>, b: Region<'tcx>) -> Region<'tcx> {
-        let r = match (*a, *b) {
+        match (*a, *b) {
             (ReLateBound(..), _) | (_, ReLateBound(..)) | (ReErased, _) | (_, ReErased) => {
                 bug!("cannot relate region: LUB({:?}, {:?})", a, b);
             }
@@ -399,11 +399,7 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
                     self.tcx().lifetimes.re_static
                 }
             }
-        };
-
-        debug!("lub_concrete_regions({:?}, {:?}) = {:?}", a, b, r);
-
-        r
+        }
     }
 
     /// After expansion is complete, go and check upper bounds (i.e.,

compiler/rustc_infer/src/infer/nll_relate/mod.rs

@@ -542,7 +542,7 @@ where
         true
     }
 
-    #[instrument(skip(self, info), level = "trace")]
+    #[instrument(skip(self, info), level = "trace", ret)]
     fn relate_with_variance<T: Relate<'tcx>>(
         &mut self,
         variance: ty::Variance,
@@ -560,8 +560,6 @@ where
 
         self.ambient_variance = old_ambient_variance;
 
-        debug!(?r);
-
         Ok(r)
     }