Lifted generics into TraitItem and ImplItem from MethodSig -- HIR now matches AST

Author: sunjay

src/librustc/hir/intravisit.rs

@@ -780,9 +780,7 @@ pub fn walk_fn_kind<'v, V: Visitor<'v>>(visitor: &mut V, function_kind: FnKind<'
         FnKind::ItemFn(_, generics, ..) => {
             visitor.visit_generics(generics);
         }
-        FnKind::Method(_, sig, ..) => {
-            visitor.visit_generics(&sig.generics);
-        }
+        FnKind::Method(..) |
         FnKind::Closure(_) => {}
     }
 }
@@ -802,6 +800,7 @@ pub fn walk_fn<'v, V: Visitor<'v>>(visitor: &mut V,
 pub fn walk_trait_item<'v, V: Visitor<'v>>(visitor: &mut V, trait_item: &'v TraitItem) {
     visitor.visit_name(trait_item.span, trait_item.name);
     walk_list!(visitor, visit_attribute, &trait_item.attrs);
+    visitor.visit_generics(&trait_item.generics);
     match trait_item.node {
         TraitItemKind::Const(ref ty, default) => {
             visitor.visit_id(trait_item.id);
@@ -810,7 +809,6 @@ pub fn walk_trait_item<'v, V: Visitor<'v>>(visitor: &mut V, trait_item: &'v Trai
         }
         TraitItemKind::Method(ref sig, TraitMethod::Required(ref names)) => {
             visitor.visit_id(trait_item.id);
-            visitor.visit_generics(&sig.generics);
             visitor.visit_fn_decl(&sig.decl);
             for name in names {
                 visitor.visit_name(name.span, name.node);
@@ -852,6 +850,7 @@ pub fn walk_impl_item<'v, V: Visitor<'v>>(visitor: &mut V, impl_item: &'v ImplIt
         ref vis,
         ref defaultness,
         ref attrs,
+        ref generics,
         ref node,
         span
     } = *impl_item;
@@ -860,6 +859,7 @@ pub fn walk_impl_item<'v, V: Visitor<'v>>(visitor: &mut V, impl_item: &'v ImplIt
     visitor.visit_vis(vis);
     visitor.visit_defaultness(defaultness);
     walk_list!(visitor, visit_attribute, attrs);
+    visitor.visit_generics(generics);
     match *node {
         ImplItemKind::Const(ref ty, body) => {
             visitor.visit_id(impl_item.id);

src/librustc/hir/lowering.rs

@@ -1539,6 +1539,7 @@ impl<'a> LoweringContext<'a> {
                 hir_id,
                 name: this.lower_ident(i.ident),
                 attrs: this.lower_attrs(&i.attrs),
+                generics: this.lower_generics(&i.generics),
                 node: match i.node {
                     TraitItemKind::Const(ref ty, ref default) => {
                         hir::TraitItemKind::Const(this.lower_ty(ty),
@@ -1548,15 +1549,15 @@ impl<'a> LoweringContext<'a> {
                     }
                     TraitItemKind::Method(ref sig, None) => {
                         let names = this.lower_fn_args_to_names(&sig.decl);
-                        hir::TraitItemKind::Method(this.lower_method_sig(&i.generics, sig),
+                        hir::TraitItemKind::Method(this.lower_method_sig(sig),
                                                    hir::TraitMethod::Required(names))
                     }
                     TraitItemKind::Method(ref sig, Some(ref body)) => {
                         let body_id = this.lower_body(Some(&sig.decl), |this| {
                             let body = this.lower_block(body, false);
                             this.expr_block(body, ThinVec::new())
                         });
-                        hir::TraitItemKind::Method(this.lower_method_sig(&i.generics, sig),
+                        hir::TraitItemKind::Method(this.lower_method_sig(sig),
                                                    hir::TraitMethod::Provided(body_id))
                     }
                     TraitItemKind::Type(ref bounds, ref default) => {
@@ -1603,6 +1604,7 @@ impl<'a> LoweringContext<'a> {
                 hir_id,
                 name: this.lower_ident(i.ident),
                 attrs: this.lower_attrs(&i.attrs),
+                generics: this.lower_generics(&i.generics),
                 vis: this.lower_visibility(&i.vis, None),
                 defaultness: this.lower_defaultness(i.defaultness, true /* [1] */),
                 node: match i.node {
@@ -1615,7 +1617,7 @@ impl<'a> LoweringContext<'a> {
                             let body = this.lower_block(body, false);
                             this.expr_block(body, ThinVec::new())
                         });
-                        hir::ImplItemKind::Method(this.lower_method_sig(&i.generics, sig), body_id)
+                        hir::ImplItemKind::Method(this.lower_method_sig(sig), body_id)
                     }
                     ImplItemKind::Type(ref ty) => hir::ImplItemKind::Type(this.lower_ty(ty)),
                     ImplItemKind::Macro(..) => panic!("Shouldn't exist any more"),
@@ -1727,9 +1729,8 @@ impl<'a> LoweringContext<'a> {
         })
     }
 
-    fn lower_method_sig(&mut self, generics: &Generics, sig: &MethodSig) -> hir::MethodSig {
+    fn lower_method_sig(&mut self, sig: &MethodSig) -> hir::MethodSig {
         hir::MethodSig {
-            generics: self.lower_generics(generics),
             abi: sig.abi,
             unsafety: self.lower_unsafety(sig.unsafety),
             constness: self.lower_constness(sig.constness),

src/librustc/hir/mod.rs

@@ -1295,7 +1295,6 @@ pub struct MethodSig {
     pub constness: Constness,
     pub abi: Abi,
     pub decl: P<FnDecl>,
-    pub generics: Generics,
 }
 
 // The bodies for items are stored "out of line", in a separate
@@ -1316,6 +1315,7 @@ pub struct TraitItem {
     pub name: Name,
     pub hir_id: HirId,
     pub attrs: HirVec<Attribute>,
+    pub generics: Generics,
     pub node: TraitItemKind,
     pub span: Span,
 }
@@ -1360,6 +1360,7 @@ pub struct ImplItem {
     pub vis: Visibility,
     pub defaultness: Defaultness,
     pub attrs: HirVec<Attribute>,
+    pub generics: Generics,
     pub node: ImplItemKind,
     pub span: Span,
 }

src/librustc/hir/print.rs

@@ -880,6 +880,7 @@ impl<'a> State<'a> {
     pub fn print_method_sig(&mut self,
                             name: ast::Name,
                             m: &hir::MethodSig,
+                            generics: &hir::Generics,
                             vis: &hir::Visibility,
                             arg_names: &[Spanned<ast::Name>],
                             body_id: Option<hir::BodyId>)
@@ -889,7 +890,7 @@ impl<'a> State<'a> {
                       m.constness,
                       m.abi,
                       Some(name),
-                      &m.generics,
+                      generics,
                       vis,
                       arg_names,
                       body_id)
@@ -905,12 +906,12 @@ impl<'a> State<'a> {
                 self.print_associated_const(ti.name, &ty, default, &hir::Inherited)?;
             }
             hir::TraitItemKind::Method(ref sig, hir::TraitMethod::Required(ref arg_names)) => {
-                self.print_method_sig(ti.name, sig, &hir::Inherited, arg_names, None)?;
+                self.print_method_sig(ti.name, sig, &ti.generics, &hir::Inherited, arg_names, None)?;
                 self.s.word(";")?;
             }
             hir::TraitItemKind::Method(ref sig, hir::TraitMethod::Provided(body)) => {
                 self.head("")?;
-                self.print_method_sig(ti.name, sig, &hir::Inherited, &[], Some(body))?;
+                self.print_method_sig(ti.name, sig, &ti.generics, &hir::Inherited, &[], Some(body))?;
                 self.nbsp()?;
                 self.end()?; // need to close a box
                 self.end()?; // need to close a box
@@ -938,7 +939,7 @@ impl<'a> State<'a> {
             }
             hir::ImplItemKind::Method(ref sig, body) => {
                 self.head("")?;
-                self.print_method_sig(ii.name, sig, &ii.vis, &[], Some(body))?;
+                self.print_method_sig(ii.name, sig, &ii.generics, &ii.vis, &[], Some(body))?;
                 self.nbsp()?;
                 self.end()?; // need to close a box
                 self.end()?; // need to close a box

src/librustc/ich/impls_hir.rs

@@ -232,8 +232,7 @@ impl_stable_hash_for!(struct hir::MethodSig {
     unsafety,
     constness,
     abi,
-    decl,
-    generics
+    decl
 });
 
 impl_stable_hash_for!(struct hir::TypeBinding {
@@ -709,13 +708,15 @@ impl<'gcx> HashStable<StableHashingContext<'gcx>> for hir::TraitItem {
             hir_id: _,
             name,
             ref attrs,
+            ref generics,
             ref node,
             span
         } = *self;
 
         hcx.hash_hir_item_like(attrs, |hcx| {
             name.hash_stable(hcx, hasher);
             attrs.hash_stable(hcx, hasher);
+            generics.hash_stable(hcx, hasher);
             node.hash_stable(hcx, hasher);
             span.hash_stable(hcx, hasher);
         });
@@ -744,6 +745,7 @@ impl<'gcx> HashStable<StableHashingContext<'gcx>> for hir::ImplItem {
             ref vis,
             defaultness,
             ref attrs,
+            ref generics,
             ref node,
             span
         } = *self;
@@ -753,6 +755,7 @@ impl<'gcx> HashStable<StableHashingContext<'gcx>> for hir::ImplItem {
             vis.hash_stable(hcx, hasher);
             defaultness.hash_stable(hcx, hasher);
             attrs.hash_stable(hcx, hasher);
+            generics.hash_stable(hcx, hasher);
             node.hash_stable(hcx, hasher);
             span.hash_stable(hcx, hasher);
         });

src/librustc/middle/reachable.rs

@@ -58,11 +58,10 @@ fn item_might_be_inlined(item: &hir::Item) -> bool {
 }
 
 fn method_might_be_inlined<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                                     sig: &hir::MethodSig,
                                      impl_item: &hir::ImplItem,
                                      impl_src: DefId) -> bool {
     if attr::requests_inline(&impl_item.attrs) ||
-        generics_require_inlining(&sig.generics) {
+        generics_require_inlining(&impl_item.generics) {
         return true
     }
     if let Some(impl_node_id) = tcx.hir.as_local_node_id(impl_src) {
@@ -176,8 +175,8 @@ impl<'a, 'tcx> ReachableContext<'a, 'tcx> {
             Some(hir_map::NodeImplItem(impl_item)) => {
                 match impl_item.node {
                     hir::ImplItemKind::Const(..) => true,
-                    hir::ImplItemKind::Method(ref sig, _) => {
-                        if generics_require_inlining(&sig.generics) ||
+                    hir::ImplItemKind::Method(..) => {
+                        if generics_require_inlining(&impl_item.generics) ||
                                 attr::requests_inline(&impl_item.attrs) {
                             true
                         } else {
@@ -293,9 +292,9 @@ impl<'a, 'tcx> ReachableContext<'a, 'tcx> {
                     hir::ImplItemKind::Const(_, body) => {
                         self.visit_nested_body(body);
                     }
-                    hir::ImplItemKind::Method(ref sig, body) => {
+                    hir::ImplItemKind::Method(_, body) => {
                         let did = self.tcx.hir.get_parent_did(search_item);
-                        if method_might_be_inlined(self.tcx, sig, impl_item, did) {
+                        if method_might_be_inlined(self.tcx, impl_item, did) {
                             self.visit_nested_body(body)
                         }
                     }

src/librustc/middle/resolve_lifetime.rs

@@ -412,7 +412,7 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
         if let hir::TraitItemKind::Method(ref sig, _) = trait_item.node {
             self.visit_early_late(
                 Some(self.hir_map.get_parent(trait_item.id)),
-                &sig.decl, &sig.generics,
+                &sig.decl, &trait_item.generics,
                 |this| intravisit::walk_trait_item(this, trait_item))
         } else {
             intravisit::walk_trait_item(self, trait_item);
@@ -423,7 +423,7 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
         if let hir::ImplItemKind::Method(ref sig, _) = impl_item.node {
             self.visit_early_late(
                 Some(self.hir_map.get_parent(impl_item.id)),
-                &sig.decl, &sig.generics,
+                &sig.decl, &impl_item.generics,
                 |this| intravisit::walk_impl_item(this, impl_item))
         } else {
             intravisit::walk_impl_item(self, impl_item);

src/librustc_typeck/check/compare_method.rs

@@ -568,15 +568,11 @@ fn compare_number_of_generics<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     let num_trait_m_type_params = trait_m_generics.types.len();
     if num_impl_m_type_params != num_trait_m_type_params {
         let impl_m_node_id = tcx.hir.as_local_node_id(impl_m.def_id).unwrap();
-        let span = match tcx.hir.expect_impl_item(impl_m_node_id).node {
-            ImplItemKind::Method(ref impl_m_sig, _) => {
-                if impl_m_sig.generics.is_parameterized() {
-                    impl_m_sig.generics.span
-                } else {
-                    impl_m_span
-                }
-            }
-            _ => bug!("{:?} is not a method", impl_m),
+        let impl_m_item = tcx.hir.expect_impl_item(impl_m_node_id);
+        let span = if impl_m_item.generics.is_parameterized() {
+            impl_m_item.generics.span
+        } else {
+            impl_m_span
         };
 
         let mut err = struct_span_err!(tcx.sess,

src/librustc_typeck/collect.rs

@@ -261,19 +261,9 @@ fn type_param_predicates<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 
     let item_node_id = tcx.hir.as_local_node_id(item_def_id).unwrap();
     let ast_generics = match tcx.hir.get(item_node_id) {
-        NodeTraitItem(item) => {
-            match item.node {
-                TraitItemKind::Method(ref sig, _) => &sig.generics,
-                _ => return result
-            }
-        }
+        NodeTraitItem(item) => &item.generics,
 
-        NodeImplItem(item) => {
-            match item.node {
-                ImplItemKind::Method(ref sig, _) => &sig.generics,
-                _ => return result
-            }
-        }
+        NodeImplItem(item) => &item.generics,
 
         NodeItem(item) => {
             match item.node {
@@ -818,12 +808,12 @@ fn has_late_bound_regions<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     match node {
         hir_map::NodeTraitItem(item) => match item.node {
             hir::TraitItemKind::Method(ref sig, _) =>
-                has_late_bound_regions(tcx, &sig.generics, &sig.decl),
+                has_late_bound_regions(tcx, &item.generics, &sig.decl),
             _ => None,
         },
         hir_map::NodeImplItem(item) => match item.node {
             hir::ImplItemKind::Method(ref sig, _) =>
-                has_late_bound_regions(tcx, &sig.generics, &sig.decl),
+                has_late_bound_regions(tcx, &item.generics, &sig.decl),
             _ => None,
         },
         hir_map::NodeForeignItem(item) => match item.node {
@@ -881,19 +871,9 @@ fn generics_of<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 
     let no_generics = hir::Generics::empty();
     let ast_generics = match node {
-        NodeTraitItem(item) => {
-            match item.node {
-                TraitItemKind::Method(ref sig, _) => &sig.generics,
-                _ => &no_generics
-            }
-        }
+        NodeTraitItem(item) => &item.generics,
 
-        NodeImplItem(item) => {
-            match item.node {
-                ImplItemKind::Method(ref sig, _) => &sig.generics,
-                _ => &no_generics
-            }
-        }
+        NodeImplItem(item) => &item.generics,
 
         NodeItem(item) => {
             match item.node {
@@ -1353,19 +1333,9 @@ fn explicit_predicates_of<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     let icx = ItemCtxt::new(tcx, def_id);
     let no_generics = hir::Generics::empty();
     let ast_generics = match node {
-        NodeTraitItem(item) => {
-            match item.node {
-                TraitItemKind::Method(ref sig, _) => &sig.generics,
-                _ => &no_generics
-            }
-        }
+        NodeTraitItem(item) => &item.generics,
 
-        NodeImplItem(item) => {
-            match item.node {
-                ImplItemKind::Method(ref sig, _) => &sig.generics,
-                _ => &no_generics
-            }
-        }
+        NodeImplItem(item) => &item.generics,
 
         NodeItem(item) => {
             match item.node {