Miscellaneous inlining improvements

Inline a few small and hot functions.

compiler/rustc_hir/src/hir.rs

@@ -773,6 +773,7 @@ pub struct MacroDef<'hir> {
 }
 
 impl MacroDef<'_> {
+    #[inline]
     pub fn hir_id(&self) -> HirId {
         HirId::make_owner(self.def_id)
     }
@@ -2024,6 +2025,7 @@ pub struct TraitItemId {
 }
 
 impl TraitItemId {
+    #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
         HirId::make_owner(self.def_id)
@@ -2045,6 +2047,7 @@ pub struct TraitItem<'hir> {
 }
 
 impl TraitItem<'_> {
+    #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
         HirId::make_owner(self.def_id)
@@ -2086,6 +2089,7 @@ pub struct ImplItemId {
 }
 
 impl ImplItemId {
+    #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
         HirId::make_owner(self.def_id)
@@ -2106,6 +2110,7 @@ pub struct ImplItem<'hir> {
 }
 
 impl ImplItem<'_> {
+    #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
         HirId::make_owner(self.def_id)
@@ -2696,6 +2701,7 @@ pub struct ItemId {
 }
 
 impl ItemId {
+    #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
         HirId::make_owner(self.def_id)
@@ -2716,6 +2722,7 @@ pub struct Item<'hir> {
 }
 
 impl Item<'_> {
+    #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
         HirId::make_owner(self.def_id)
@@ -2900,6 +2907,7 @@ pub struct ForeignItemId {
 }
 
 impl ForeignItemId {
+    #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
         HirId::make_owner(self.def_id)
@@ -2932,6 +2940,7 @@ pub struct ForeignItem<'hir> {
 }
 
 impl ForeignItem<'_> {
+    #[inline]
     pub fn hir_id(&self) -> HirId {
         // Items are always HIR owners.
         HirId::make_owner(self.def_id)

compiler/rustc_hir/src/hir_id.rs

@@ -28,6 +28,7 @@ impl HirId {
         if self.local_id.index() == 0 { Some(self.owner) } else { None }
     }
 
+    #[inline]
     pub fn make_owner(owner: LocalDefId) -> Self {
         Self { owner, local_id: ItemLocalId::from_u32(0) }
     }

compiler/rustc_index/src/vec.rs

@@ -111,6 +111,7 @@ macro_rules! newtype_index {
         }
 
         impl Clone for $type {
+            #[inline]
             fn clone(&self) -> Self {
                 *self
             }

compiler/rustc_middle/src/mir/mod.rs

@@ -61,12 +61,14 @@ pub trait HasLocalDecls<'tcx> {
 }
 
 impl<'tcx> HasLocalDecls<'tcx> for LocalDecls<'tcx> {
+    #[inline]
     fn local_decls(&self) -> &LocalDecls<'tcx> {
         self
     }
 }
 
 impl<'tcx> HasLocalDecls<'tcx> for Body<'tcx> {
+    #[inline]
     fn local_decls(&self) -> &LocalDecls<'tcx> {
         &self.local_decls
     }
@@ -1772,6 +1774,7 @@ impl<'tcx> Place<'tcx> {
         self.as_ref().as_local()
     }
 
+    #[inline]
     pub fn as_ref(&self) -> PlaceRef<'tcx> {
         PlaceRef { local: self.local, projection: &self.projection }
     }
@@ -1783,6 +1786,7 @@ impl<'tcx> Place<'tcx> {
     /// - (a.b, .c)
     ///
     /// Given a place without projections, the iterator is empty.
+    #[inline]
     pub fn iter_projections(
         self,
     ) -> impl Iterator<Item = (PlaceRef<'tcx>, PlaceElem<'tcx>)> + DoubleEndedIterator {

compiler/rustc_middle/src/mir/tcx.rs

@@ -21,6 +21,7 @@ pub struct PlaceTy<'tcx> {
 static_assert_size!(PlaceTy<'_>, 16);
 
 impl<'tcx> PlaceTy<'tcx> {
+    #[inline]
     pub fn from_ty(ty: Ty<'tcx>) -> PlaceTy<'tcx> {
         PlaceTy { ty, variant_index: None }
     }

compiler/rustc_middle/src/mir/visit.rs

@@ -1201,6 +1201,7 @@ pub enum PlaceContext {
 
 impl PlaceContext {
     /// Returns `true` if this place context represents a drop.
+    #[inline]
     pub fn is_drop(&self) -> bool {
         matches!(self, PlaceContext::MutatingUse(MutatingUseContext::Drop))
     }
@@ -1218,6 +1219,7 @@ impl PlaceContext {
     }
 
     /// Returns `true` if this place context represents a storage live or storage dead marker.
+    #[inline]
     pub fn is_storage_marker(&self) -> bool {
         matches!(
             self,
@@ -1226,16 +1228,19 @@ impl PlaceContext {
     }
 
     /// Returns `true` if this place context represents a use that potentially changes the value.
+    #[inline]
     pub fn is_mutating_use(&self) -> bool {
         matches!(self, PlaceContext::MutatingUse(..))
     }
 
     /// Returns `true` if this place context represents a use that does not change the value.
+    #[inline]
     pub fn is_nonmutating_use(&self) -> bool {
         matches!(self, PlaceContext::NonMutatingUse(..))
     }
 
     /// Returns `true` if this place context represents a use.
+    #[inline]
     pub fn is_use(&self) -> bool {
         !matches!(self, PlaceContext::NonUse(..))
     }

compiler/rustc_middle/src/ty/context.rs

@@ -206,19 +206,26 @@ pub struct LocalTableInContext<'a, V> {
 /// would be in a different frame of reference and using its `local_id`
 /// would result in lookup errors, or worse, in silently wrong data being
 /// stored/returned.
+#[inline]
 fn validate_hir_id_for_typeck_results(hir_owner: LocalDefId, hir_id: hir::HirId) {
     if hir_id.owner != hir_owner {
-        ty::tls::with(|tcx| {
-            bug!(
-                "node {} with HirId::owner {:?} cannot be placed in TypeckResults with hir_owner {:?}",
-                tcx.hir().node_to_string(hir_id),
-                hir_id.owner,
-                hir_owner
-            )
-        });
+        invalid_hir_id_for_typeck_results(hir_owner, hir_id);
     }
 }
 
+#[cold]
+#[inline(never)]
+fn invalid_hir_id_for_typeck_results(hir_owner: LocalDefId, hir_id: hir::HirId) {
+    ty::tls::with(|tcx| {
+        bug!(
+            "node {} with HirId::owner {:?} cannot be placed in TypeckResults with hir_owner {:?}",
+            tcx.hir().node_to_string(hir_id),
+            hir_id.owner,
+            hir_owner
+        )
+    });
+}
+
 impl<'a, V> LocalTableInContext<'a, V> {
     pub fn contains_key(&self, id: hir::HirId) -> bool {
         validate_hir_id_for_typeck_results(self.hir_owner, id);

compiler/rustc_middle/src/ty/fold.rs

@@ -837,6 +837,7 @@ impl<'tcx> TypeVisitor<'tcx> for HasEscapingVarsVisitor {
         result
     }
 
+    #[inline]
     fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
         // If the outer-exclusive-binder is *strictly greater* than
         // `outer_index`, that means that `t` contains some content
@@ -850,6 +851,7 @@ impl<'tcx> TypeVisitor<'tcx> for HasEscapingVarsVisitor {
         }
     }
 
+    #[inline]
     fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
         // If the region is bound by `outer_index` or anything outside
         // of outer index, then it escapes the binders we have
@@ -875,6 +877,7 @@ impl<'tcx> TypeVisitor<'tcx> for HasEscapingVarsVisitor {
         }
     }
 
+    #[inline]
     fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
         if predicate.inner.outer_exclusive_binder > self.outer_index {
             ControlFlow::Break(FoundEscapingVars)
@@ -895,6 +898,7 @@ struct HasTypeFlagsVisitor {
 impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
     type BreakTy = FoundFlags;
 
+    #[inline]
     fn visit_ty(&mut self, t: Ty<'_>) -> ControlFlow<Self::BreakTy> {
         debug!(
             "HasTypeFlagsVisitor: t={:?} t.flags={:?} self.flags={:?}",
@@ -909,6 +913,7 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
         }
     }
 
+    #[inline]
     fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
         let flags = r.type_flags();
         debug!("HasTypeFlagsVisitor: r={:?} r.flags={:?} self.flags={:?}", r, flags, self.flags);
@@ -919,6 +924,7 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
         }
     }
 
+    #[inline]
     fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
         let flags = FlagComputation::for_const(c);
         debug!("HasTypeFlagsVisitor: c={:?} c.flags={:?} self.flags={:?}", c, flags, self.flags);
@@ -929,6 +935,7 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
         }
     }
 
+    #[inline]
     fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
         debug!(
             "HasTypeFlagsVisitor: predicate={:?} predicate.flags={:?} self.flags={:?}",

compiler/rustc_middle/src/ty/mod.rs

@@ -1055,6 +1055,7 @@ impl<'tcx> Eq for Predicate<'tcx> {}
 
 impl<'tcx> Predicate<'tcx> {
     /// Gets the inner `Binder<PredicateKind<'tcx>>`.
+    #[inline]
     pub fn kind(self) -> Binder<PredicateKind<'tcx>> {
         self.inner.kind
     }

compiler/rustc_middle/src/ty/sty.rs

@@ -1256,6 +1256,7 @@ impl<'tcx> ParamTy {
         ParamTy::new(def.index, def.name)
     }
 
+    #[inline]
     pub fn to_ty(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
         tcx.mk_ty_param(self.index, self.name)
     }
@@ -1561,14 +1562,17 @@ impl RegionKind {
         }
     }
 
+    #[inline]
     pub fn is_late_bound(&self) -> bool {
         matches!(*self, ty::ReLateBound(..))
     }
 
+    #[inline]
     pub fn is_placeholder(&self) -> bool {
         matches!(*self, ty::RePlaceholder(..))
     }
 
+    #[inline]
     pub fn bound_at_or_above_binder(&self, index: ty::DebruijnIndex) -> bool {
         match *self {
             ty::ReLateBound(debruijn, _) => debruijn >= index,

compiler/rustc_mir/src/util/storage.rs

@@ -34,6 +34,7 @@ impl AlwaysLiveLocals {
 impl std::ops::Deref for AlwaysLiveLocals {
     type Target = BitSet<Local>;
 
+    #[inline]
     fn deref(&self) -> &Self::Target {
         &self.0
     }

compiler/rustc_session/src/session.rs

@@ -77,6 +77,7 @@ impl Limit {
 
     /// Check that `value` is within the limit. Ensures that the same comparisons are used
     /// throughout the compiler, as mismatches can cause ICEs, see #72540.
+    #[inline]
     pub fn value_within_limit(&self, value: usize) -> bool {
         value <= self.0
     }
@@ -347,10 +348,12 @@ impl Session {
         self.crate_types.set(crate_types).expect("`crate_types` was initialized twice")
     }
 
+    #[inline]
     pub fn recursion_limit(&self) -> Limit {
         self.recursion_limit.get().copied().unwrap()
     }
 
+    #[inline]
     pub fn type_length_limit(&self) -> Limit {
         self.type_length_limit.get().copied().unwrap()
     }