feed def_span in resolver

compiler/rustc_ast_lowering/src/lib.rs

@@ -804,12 +804,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
     /// Intercept all spans entering HIR.
     /// Mark a span as relative to the current owning item.
     fn lower_span(&self, span: Span) -> Span {
-        if self.tcx.sess.opts.incremental.is_some() {
-            span.with_parent(Some(self.current_hir_id_owner.def_id))
-        } else {
-            // Do not make spans relative when not using incremental compilation.
-            span
-        }
+        rustc_middle::util::lower_span(self.tcx, span, self.current_hir_id_owner.def_id)
     }
 
     fn lower_ident(&self, ident: Ident) -> Ident {

compiler/rustc_interface/src/queries.rs

@@ -170,11 +170,14 @@ impl<'tcx> Queries<'tcx> {
                     &pre_configured_attrs,
                     crate_name,
                 )));
+                let span = krate.spans.inner_span;
                 feed.crate_for_resolver(tcx.arena.alloc(Steal::new((krate, pre_configured_attrs))));
                 feed.output_filenames(Arc::new(outputs));
 
-                let feed = tcx.feed_local_def_id(CRATE_DEF_ID);
+                let def_id = CRATE_DEF_ID;
+                let feed = tcx.feed_local_def_id(def_id);
                 feed.def_kind(DefKind::Mod);
+                feed.def_span(rustc_middle::util::lower_span(tcx, span, def_id));
             });
             Ok(qcx)
         })

compiler/rustc_middle/src/hir/map/mod.rs

@@ -19,6 +19,25 @@ use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{ErrorGuaranteed, Span};
 use rustc_target::spec::abi::Abi;
 
+pub fn until_within(outer: Span, end: Span) -> Span {
+    if let Some(end) = end.find_ancestor_inside(outer) { outer.with_hi(end.hi()) } else { outer }
+}
+
+pub fn named_span(item_span: Span, ident: Ident, generics_span: Option<Span>) -> Span {
+    if ident.name != kw::Empty {
+        let mut span = until_within(item_span, ident.span);
+        if let Some(g) = generics_span
+            && !g.is_dummy()
+            && let Some(g_span) = g.find_ancestor_inside(item_span)
+        {
+            span = span.to(g_span);
+        }
+        span
+    } else {
+        item_span
+    }
+}
+
 #[inline]
 pub fn associated_body(node: Node<'_>) -> Option<(LocalDefId, BodyId)> {
     match node {
@@ -847,27 +866,9 @@ impl<'hir> Map<'hir> {
     }
 
     pub fn opt_span(self, hir_id: HirId) -> Option<Span> {
-        fn until_within(outer: Span, end: Span) -> Span {
-            if let Some(end) = end.find_ancestor_inside(outer) {
-                outer.with_hi(end.hi())
-            } else {
-                outer
-            }
-        }
-
-        fn named_span(item_span: Span, ident: Ident, generics: Option<&Generics<'_>>) -> Span {
-            if ident.name != kw::Empty {
-                let mut span = until_within(item_span, ident.span);
-                if let Some(g) = generics
-                    && !g.span.is_dummy()
-                    && let Some(g_span) = g.span.find_ancestor_inside(item_span)
-                {
-                    span = span.to(g_span);
-                }
-                span
-            } else {
-                item_span
-            }
+        if let Some(owner) = hir_id.as_owner() {
+            let span = self.tcx.def_span(owner.def_id);
+            return Some(span);
         }
 
         let span = match self.tcx.opt_hir_node(hir_id)? {
@@ -934,10 +935,10 @@ impl<'hir> Map<'hir> {
                     // SyntaxContext of the path.
                     path.span.find_ancestor_in_same_ctxt(item.span).unwrap_or(item.span)
                 }
-                _ => named_span(item.span, item.ident, item.kind.generics()),
+                _ => named_span(item.span, item.ident, item.kind.generics().map(|g| g.span)),
             },
             Node::Variant(variant) => named_span(variant.span, variant.ident, None),
-            Node::ImplItem(item) => named_span(item.span, item.ident, Some(item.generics)),
+            Node::ImplItem(item) => named_span(item.span, item.ident, Some(item.generics.span)),
             Node::ForeignItem(item) => match item.kind {
                 ForeignItemKind::Fn(decl, _, _) => until_within(item.span, decl.output.span()),
                 _ => named_span(item.span, item.ident, None),

compiler/rustc_middle/src/hir/mod.rs

@@ -14,7 +14,7 @@ use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId, LocalModDefId};
 use rustc_hir::*;
 use rustc_query_system::ich::StableHashingContext;
-use rustc_span::{ErrorGuaranteed, ExpnId, DUMMY_SP};
+use rustc_span::{ErrorGuaranteed, ExpnId};
 
 /// Top-level HIR node for current owner. This only contains the node for which
 /// `HirId::local_id == 0`, and excludes bodies.
@@ -175,10 +175,6 @@ pub fn provide(providers: &mut Providers) {
     providers.hir_attrs = |tcx, id| {
         tcx.hir_crate(()).owners[id.def_id].as_owner().map_or(AttributeMap::EMPTY, |o| &o.attrs)
     };
-    providers.def_span = |tcx, def_id| {
-        let hir_id = tcx.local_def_id_to_hir_id(def_id);
-        tcx.hir().opt_span(hir_id).unwrap_or(DUMMY_SP)
-    };
     providers.def_ident_span = |tcx, def_id| {
         let hir_id = tcx.local_def_id_to_hir_id(def_id);
         tcx.hir().opt_ident_span(hir_id)

compiler/rustc_middle/src/util/lower_span.rs

@@ -0,0 +1,13 @@
+use rustc_hir::def_id::LocalDefId;
+use rustc_span::Span;
+
+use crate::ty::TyCtxt;
+
+pub fn lower_span(tcx: TyCtxt<'_>, span: Span, parent: LocalDefId) -> Span {
+    if tcx.sess.opts.incremental.is_some() {
+        span.with_parent(Some(parent))
+    } else {
+        // Do not make spans relative when not using incremental compilation.
+        span
+    }
+}

compiler/rustc_middle/src/util/mod.rs

@@ -2,9 +2,11 @@ pub mod bug;
 pub mod call_kind;
 pub mod common;
 pub mod find_self_call;
+mod lower_span;
 
 pub use call_kind::{call_kind, CallDesugaringKind, CallKind};
 pub use find_self_call::find_self_call;
+pub use lower_span::lower_span;
 
 #[derive(Default, Copy, Clone)]
 pub struct Providers {

compiler/rustc_monomorphize/src/collector.rs

@@ -1441,7 +1441,7 @@ fn collect_used_items<'tcx>(
     // and abort compilation if any of them errors.
     MirUsedCollector {
         tcx,
-        body: body,
+        body,
         output,
         instance,
         move_size_spans: vec![],

compiler/rustc_resolve/src/def_collector.rs

@@ -4,6 +4,7 @@ use rustc_ast::*;
 use rustc_expand::expand::AstFragment;
 use rustc_hir::def::{CtorKind, CtorOf, DefKind};
 use rustc_hir::def_id::LocalDefId;
+use rustc_middle::hir::map::{named_span, until_within};
 use rustc_span::hygiene::LocalExpnId;
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::Span;
@@ -31,18 +32,20 @@ impl<'a, 'b, 'tcx> DefCollector<'a, 'b, 'tcx> {
         node_id: NodeId,
         name: Symbol,
         def_kind: DefKind,
+        def_span: Span,
         span: Span,
     ) -> LocalDefId {
         let parent_def = self.parent_def;
         debug!(
-            "create_def(node_id={:?}, def_kind={:?}, parent_def={:?})",
-            node_id, def_kind, parent_def
+            "create_def(node_id={:?}, def_kind={:?}, parent_def={:?}, def_span={:?})",
+            node_id, def_kind, parent_def, def_span
         );
         self.resolver.create_def(
             parent_def,
             node_id,
             name,
             def_kind,
+            def_span,
             self.expansion.to_expn_id(),
             span.with_parent(None),
         )
@@ -78,7 +81,7 @@ impl<'a, 'b, 'tcx> DefCollector<'a, 'b, 'tcx> {
             self.visit_macro_invoc(field.id);
         } else {
             let name = field.ident.map_or_else(|| sym::integer(index(self)), |ident| ident.name);
-            let def = self.create_def(field.id, name, DefKind::Field, field.span);
+            let def = self.create_def(field.id, name, DefKind::Field, field.span, field.span);
             self.with_parent(def, |this| visit::walk_field_def(this, field));
         }
     }
@@ -91,6 +94,33 @@ impl<'a, 'b, 'tcx> DefCollector<'a, 'b, 'tcx> {
     }
 }
 
+fn def_span_for_item(i: &Item) -> Span {
+    match &i.kind {
+        ItemKind::ForeignMod(_) => i.span,
+        ItemKind::GlobalAsm(_) => i.span,
+        ItemKind::Fn(f) => f.sig.span.find_ancestor_in_same_ctxt(i.span).unwrap_or(i.span),
+        ItemKind::Static(s) => until_within(i.span, s.ty.span),
+        ItemKind::Const(c) => until_within(i.span, c.ty.span),
+        ItemKind::Impl(im) => until_within(i.span, im.generics.where_clause.span),
+        ItemKind::MacroDef(_) => named_span(i.span, i.ident, i.kind.generics().map(|g| g.span)),
+        ItemKind::Mod(_, _) => named_span(i.span, i.ident, i.kind.generics().map(|g| g.span)),
+        ItemKind::TyAlias(_) => named_span(i.span, i.ident, i.kind.generics().map(|g| g.span)),
+        ItemKind::TraitAlias(_, _) => {
+            named_span(i.span, i.ident, i.kind.generics().map(|g| g.span))
+        }
+        ItemKind::ExternCrate(_) => named_span(i.span, i.ident, i.kind.generics().map(|g| g.span)),
+        ItemKind::Union(_, _) => named_span(i.span, i.ident, i.kind.generics().map(|g| g.span)),
+        ItemKind::Enum(..) => named_span(i.span, i.ident, i.kind.generics().map(|g| g.span)),
+        ItemKind::Struct(..) => named_span(i.span, i.ident, i.kind.generics().map(|g| g.span)),
+        ItemKind::Trait(t) => {
+            let end = if let Some(b) = t.bounds.last() { b.span() } else { t.generics.span };
+            until_within(i.span, end)
+        }
+        ItemKind::Use(_) => unreachable!(),
+        ItemKind::MacCall(_) => unreachable!(),
+    }
+}
+
 impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
     fn visit_item(&mut self, i: &'a Item) {
         debug!("visit_item: {:?}", i);
@@ -127,7 +157,7 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
                 return visit::walk_item(self, i);
             }
         };
-        let def_id = self.create_def(i.id, i.ident.name, def_kind, i.span);
+        let def_id = self.create_def(i.id, i.ident.name, def_kind, def_span_for_item(i), i.span);
 
         if let Some(macro_data) = opt_macro_data {
             self.resolver.macro_map.insert(def_id.to_def_id(), macro_data);
@@ -143,6 +173,7 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
                                 ctor_node_id,
                                 kw::Empty,
                                 DefKind::Ctor(CtorOf::Struct, ctor_kind),
+                                this.resolver.tcx.def_span(this.parent_def),
                                 i.span,
                             );
                         }
@@ -176,6 +207,7 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
                             coroutine_kind.closure_id(),
                             kw::Empty,
                             DefKind::Closure,
+                            body.span.find_ancestor_in_same_ctxt(span).unwrap_or(span),
                             span,
                         );
                         self.with_parent(closure_def, |this| this.visit_block(body));
@@ -190,19 +222,27 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
     }
 
     fn visit_use_tree(&mut self, use_tree: &'a UseTree, id: NodeId, _nested: bool) {
-        self.create_def(id, kw::Empty, DefKind::Use, use_tree.span);
+        let def_span =
+            use_tree.prefix.span.find_ancestor_in_same_ctxt(use_tree.span).unwrap_or(use_tree.span);
+        self.create_def(id, kw::Empty, DefKind::Use, def_span, use_tree.span);
         visit::walk_use_tree(self, use_tree, id);
     }
 
     fn visit_foreign_item(&mut self, fi: &'a ForeignItem) {
-        let def_kind = match fi.kind {
-            ForeignItemKind::Static(_, mt, _) => DefKind::Static(mt),
-            ForeignItemKind::Fn(_) => DefKind::Fn,
-            ForeignItemKind::TyAlias(_) => DefKind::ForeignTy,
+        let (def_kind, def_span) = match &fi.kind {
+            ForeignItemKind::Static(ty, mt, _) => {
+                (DefKind::Static(*mt), until_within(fi.span, ty.span))
+            }
+            ForeignItemKind::Fn(f) => {
+                (DefKind::Fn, until_within(fi.span, f.sig.decl.output.span()))
+            }
+            ForeignItemKind::TyAlias(_) => {
+                (DefKind::ForeignTy, named_span(fi.span, fi.ident, None))
+            }
             ForeignItemKind::MacCall(_) => return self.visit_macro_invoc(fi.id),
         };
 
-        let def = self.create_def(fi.id, fi.ident.name, def_kind, fi.span);
+        let def = self.create_def(fi.id, fi.ident.name, def_kind, def_span, fi.span);
 
         self.with_parent(def, |this| visit::walk_foreign_item(this, fi));
     }
@@ -211,13 +251,20 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
         if v.is_placeholder {
             return self.visit_macro_invoc(v.id);
         }
-        let def = self.create_def(v.id, v.ident.name, DefKind::Variant, v.span);
+        let def = self.create_def(
+            v.id,
+            v.ident.name,
+            DefKind::Variant,
+            named_span(v.span, v.ident, None),
+            v.span,
+        );
         self.with_parent(def, |this| {
             if let Some((ctor_kind, ctor_node_id)) = CtorKind::from_ast(&v.data) {
                 this.create_def(
                     ctor_node_id,
                     kw::Empty,
                     DefKind::Ctor(CtorOf::Variant, ctor_kind),
+                    this.resolver.tcx.def_span(this.parent_def),
                     v.span,
                 );
             }
@@ -244,7 +291,7 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
             GenericParamKind::Type { .. } => DefKind::TyParam,
             GenericParamKind::Const { .. } => DefKind::ConstParam,
         };
-        self.create_def(param.id, param.ident.name, def_kind, param.ident.span);
+        self.create_def(param.id, param.ident.name, def_kind, param.span(), param.ident.span);
 
         // impl-Trait can happen inside generic parameters, like
         // ```
@@ -258,14 +305,19 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
     }
 
     fn visit_assoc_item(&mut self, i: &'a AssocItem, ctxt: visit::AssocCtxt) {
-        let def_kind = match &i.kind {
-            AssocItemKind::Fn(..) => DefKind::AssocFn,
-            AssocItemKind::Const(..) => DefKind::AssocConst,
-            AssocItemKind::Type(..) => DefKind::AssocTy,
+        let (def_kind, def_span) = match &i.kind {
+            AssocItemKind::Fn(f) => {
+                (DefKind::AssocFn, f.sig.span.find_ancestor_in_same_ctxt(i.span).unwrap_or(i.span))
+            }
+            AssocItemKind::Const(c) => (DefKind::AssocConst, until_within(i.span, c.ty.span)),
+            AssocItemKind::Type(ty) => (DefKind::AssocTy, {
+                let end = if let Some(b) = ty.bounds.last() { b.span() } else { ty.generics.span };
+                until_within(i.span, end)
+            }),
             AssocItemKind::MacCall(..) => return self.visit_macro_invoc(i.id),
         };
 
-        let def = self.create_def(i.id, i.ident.name, def_kind, i.span);
+        let def = self.create_def(i.id, i.ident.name, def_kind, def_span, i.span);
         self.with_parent(def, |this| visit::walk_assoc_item(this, i, ctxt));
     }
 
@@ -277,7 +329,13 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
     }
 
     fn visit_anon_const(&mut self, constant: &'a AnonConst) {
-        let def = self.create_def(constant.id, kw::Empty, DefKind::AnonConst, constant.value.span);
+        let def = self.create_def(
+            constant.id,
+            kw::Empty,
+            DefKind::AnonConst,
+            constant.value.span,
+            constant.value.span,
+        );
         self.with_parent(def, |this| visit::walk_anon_const(this, constant));
     }
 
@@ -287,26 +345,35 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
             ExprKind::Closure(ref closure) => {
                 // Async closures desugar to closures inside of closures, so
                 // we must create two defs.
-                let closure_def = self.create_def(expr.id, kw::Empty, DefKind::Closure, expr.span);
+                let def_span =
+                    closure.fn_decl_span.find_ancestor_inside(expr.span).unwrap_or(expr.span);
+                let closure_def =
+                    self.create_def(expr.id, kw::Empty, DefKind::Closure, def_span, expr.span);
                 match closure.coroutine_kind {
                     Some(coroutine_kind) => self.create_def(
                         coroutine_kind.closure_id(),
                         kw::Empty,
                         DefKind::Closure,
+                        closure
+                            .body
+                            .span
+                            .find_ancestor_in_same_ctxt(expr.span)
+                            .unwrap_or(expr.span),
                         expr.span,
                     ),
                     None => closure_def,
                 }
             }
             ExprKind::Gen(_, _, _) => {
-                self.create_def(expr.id, kw::Empty, DefKind::Closure, expr.span)
+                self.create_def(expr.id, kw::Empty, DefKind::Closure, expr.span, expr.span)
             }
             ExprKind::ConstBlock(ref constant) => {
                 let def = self.create_def(
                     constant.id,
                     kw::Empty,
                     DefKind::InlineConst,
                     constant.value.span,
+                    constant.value.span,
                 );
                 self.with_parent(def, |this| visit::walk_anon_const(this, constant));
                 return;