Move match_path from DefId to lint::LateContext

3 files changed, 114 insertions, 107 deletions

diff --git a/src/librustc/hir/def_id.rs b/src/librustc/hir/def_id.rs
index abfa96841d9..8536f38e48c 100644
--- a/src/librustc/hir/def_id.rs
+++ b/src/librustc/hir/def_id.rs
@@ -1,10 +1,9 @@
-use crate::ty::{self, print::Printer, subst::Kind, Ty, TyCtxt};
-use crate::hir::map::definitions::{DisambiguatedDefPathData, FIRST_FREE_HIGH_DEF_INDEX};
+use crate::ty::{self, TyCtxt};
+use crate::hir::map::definitions::FIRST_FREE_HIGH_DEF_INDEX;
 use rustc_data_structures::indexed_vec::Idx;
 use serialize;
 use std::fmt;
 use std::u32;
-use syntax::symbol::{LocalInternedString, Symbol};
 
 newtype_index! {
     pub struct CrateId {
@@ -252,107 +251,6 @@ impl DefId {
             format!("module `{}`", tcx.def_path_str(*self))
         }
     }
-
-    /// Check if a `DefId`'s path matches the given absolute type path usage.
-    // Uplifted from rust-lang/rust-clippy
-    pub fn match_path<'a, 'tcx>(self, tcx: TyCtxt<'a, 'tcx, 'tcx>, path: &[&str]) -> bool {
-        pub struct AbsolutePathPrinter<'a, 'tcx> {
-            pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
-        }
-
-        impl<'tcx> Printer<'tcx, 'tcx> for AbsolutePathPrinter<'_, 'tcx> {
-            type Error = !;
-
-            type Path = Vec<LocalInternedString>;
-            type Region = ();
-            type Type = ();
-            type DynExistential = ();
-
-            fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
-                self.tcx
-            }
-
-            fn print_region(self, _region: ty::Region<'_>) -> Result<Self::Region, Self::Error> {
-                Ok(())
-            }
-
-            fn print_type(self, _ty: Ty<'tcx>) -> Result<Self::Type, Self::Error> {
-                Ok(())
-            }
-
-            fn print_dyn_existential(
-                self,
-                _predicates: &'tcx ty::List<ty::ExistentialPredicate<'tcx>>,
-                ) -> Result<Self::DynExistential, Self::Error> {
-                Ok(())
-            }
-
-            fn path_crate(self, cnum: CrateNum) -> Result<Self::Path, Self::Error> {
-                Ok(vec![self.tcx.original_crate_name(cnum).as_str()])
-            }
-
-            fn path_qualified(
-                self,
-                self_ty: Ty<'tcx>,
-                trait_ref: Option<ty::TraitRef<'tcx>>,
-                ) -> Result<Self::Path, Self::Error> {
-                if trait_ref.is_none() {
-                    if let ty::Adt(def, substs) = self_ty.sty {
-                        return self.print_def_path(def.did, substs);
-                    }
-                }
-
-                // This shouldn't ever be needed, but just in case:
-                Ok(vec![match trait_ref {
-                    Some(trait_ref) => Symbol::intern(&format!("{:?}", trait_ref)).as_str(),
-                    None => Symbol::intern(&format!("<{}>", self_ty)).as_str(),
-                }])
-            }
-
-            fn path_append_impl(
-                self,
-                print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
-                _disambiguated_data: &DisambiguatedDefPathData,
-                self_ty: Ty<'tcx>,
-                trait_ref: Option<ty::TraitRef<'tcx>>,
-                ) -> Result<Self::Path, Self::Error> {
-                let mut path = print_prefix(self)?;
-
-                // This shouldn't ever be needed, but just in case:
-                path.push(match trait_ref {
-                    Some(trait_ref) => {
-                        Symbol::intern(&format!("<impl {} for {}>", trait_ref, self_ty)).as_str()
-                    },
-                    None => Symbol::intern(&format!("<impl {}>", self_ty)).as_str(),
-                });
-
-                Ok(path)
-            }
-
-            fn path_append(
-                self,
-                print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
-                disambiguated_data: &DisambiguatedDefPathData,
-                ) -> Result<Self::Path, Self::Error> {
-                let mut path = print_prefix(self)?;
-                path.push(disambiguated_data.data.as_interned_str().as_str());
-                Ok(path)
-            }
-
-            fn path_generic_args(
-                self,
-                print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
-                _args: &[Kind<'tcx>],
-                ) -> Result<Self::Path, Self::Error> {
-                print_prefix(self)
-            }
-        }
-
-        let names = AbsolutePathPrinter { tcx }.print_def_path(self, &[]).unwrap();
-
-        names.len() == path.len()
-            && names.into_iter().zip(path.iter()).all(|(a, &b)| *a == *b)
-    }
 }
 
 impl serialize::UseSpecializedEncodable for DefId {}
diff --git a/src/librustc/lint/context.rs b/src/librustc/lint/context.rs
index e5eafd768bb..15ea6403e38 100644
--- a/src/librustc/lint/context.rs
+++ b/src/librustc/lint/context.rs
@@ -25,7 +25,7 @@ use crate::lint::levels::{LintLevelSets, LintLevelsBuilder};
 use crate::middle::privacy::AccessLevels;
 use crate::rustc_serialize::{Decoder, Decodable, Encoder, Encodable};
 use crate::session::{config, early_error, Session};
-use crate::ty::{self, TyCtxt, Ty};
+use crate::ty::{self, print::Printer, subst::Kind, TyCtxt, Ty};
 use crate::ty::layout::{LayoutError, LayoutOf, TyLayout};
 use crate::util::nodemap::FxHashMap;
 use crate::util::common::time;
@@ -36,9 +36,10 @@ use syntax::edition;
 use syntax_pos::{MultiSpan, Span, symbol::{LocalInternedString, Symbol}};
 use errors::DiagnosticBuilder;
 use crate::hir;
-use crate::hir::def_id::{DefId, LOCAL_CRATE};
+use crate::hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
 use crate::hir::intravisit as hir_visit;
 use crate::hir::intravisit::Visitor;
+use crate::hir::map::{definitions::DisambiguatedDefPathData, DefPathData};
 use syntax::util::lev_distance::find_best_match_for_name;
 use syntax::visit as ast_visit;
 
@@ -752,6 +753,114 @@ impl<'a, 'tcx> LateContext<'a, 'tcx> {
     pub fn current_lint_root(&self) -> hir::HirId {
         self.last_node_with_lint_attrs
     }
+
+    /// Check if a `DefId`'s path matches the given absolute type path usage.
+    // Uplifted from rust-lang/rust-clippy
+    pub fn match_path(&self, def_id: DefId, path: &[&str]) -> bool {
+        pub struct AbsolutePathPrinter<'a, 'tcx> {
+            pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
+        }
+
+        impl<'tcx> Printer<'tcx, 'tcx> for AbsolutePathPrinter<'_, 'tcx> {
+            type Error = !;
+
+            type Path = Vec<LocalInternedString>;
+            type Region = ();
+            type Type = ();
+            type DynExistential = ();
+
+            fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
+                self.tcx
+            }
+
+            fn print_region(self, _region: ty::Region<'_>) -> Result<Self::Region, Self::Error> {
+                Ok(())
+            }
+
+            fn print_type(self, _ty: Ty<'tcx>) -> Result<Self::Type, Self::Error> {
+                Ok(())
+            }
+
+            fn print_dyn_existential(
+                self,
+                _predicates: &'tcx ty::List<ty::ExistentialPredicate<'tcx>>,
+                ) -> Result<Self::DynExistential, Self::Error> {
+                Ok(())
+            }
+
+            fn path_crate(self, cnum: CrateNum) -> Result<Self::Path, Self::Error> {
+                Ok(vec![self.tcx.original_crate_name(cnum).as_str()])
+            }
+
+            fn path_qualified(
+                self,
+                self_ty: Ty<'tcx>,
+                trait_ref: Option<ty::TraitRef<'tcx>>,
+                ) -> Result<Self::Path, Self::Error> {
+                if trait_ref.is_none() {
+                    if let ty::Adt(def, substs) = self_ty.sty {
+                        return self.print_def_path(def.did, substs);
+                    }
+                }
+
+                // This shouldn't ever be needed, but just in case:
+                Ok(vec![match trait_ref {
+                    Some(trait_ref) => Symbol::intern(&format!("{:?}", trait_ref)).as_str(),
+                    None => Symbol::intern(&format!("<{}>", self_ty)).as_str(),
+                }])
+            }
+
+            fn path_append_impl(
+                self,
+                print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
+                _disambiguated_data: &DisambiguatedDefPathData,
+                self_ty: Ty<'tcx>,
+                trait_ref: Option<ty::TraitRef<'tcx>>,
+                ) -> Result<Self::Path, Self::Error> {
+                let mut path = print_prefix(self)?;
+
+                // This shouldn't ever be needed, but just in case:
+                path.push(match trait_ref {
+                    Some(trait_ref) => {
+                        Symbol::intern(&format!("<impl {} for {}>", trait_ref, self_ty)).as_str()
+                    },
+                    None => Symbol::intern(&format!("<impl {}>", self_ty)).as_str(),
+                });
+
+                Ok(path)
+            }
+
+            fn path_append(
+                self,
+                print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
+                disambiguated_data: &DisambiguatedDefPathData,
+                ) -> Result<Self::Path, Self::Error> {
+                let mut path = print_prefix(self)?;
+
+                // Skip `::{{constructor}}` on tuple/unit structs.
+                match disambiguated_data.data {
+                    DefPathData::Ctor => return Ok(path),
+                    _ => {}
+                }
+
+                path.push(disambiguated_data.data.as_interned_str().as_str());
+                Ok(path)
+            }
+
+            fn path_generic_args(
+                self,
+                print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
+                _args: &[Kind<'tcx>],
+                ) -> Result<Self::Path, Self::Error> {
+                print_prefix(self)
+            }
+        }
+
+        let names = AbsolutePathPrinter { tcx: self.tcx }.print_def_path(def_id, &[]).unwrap();
+
+        names.len() == path.len()
+            && names.into_iter().zip(path.iter()).all(|(a, &b)| *a == *b)
+    }
 }
 
 impl<'a, 'tcx> LayoutOf for LateContext<'a, 'tcx> {
diff --git a/src/librustc/lint/internal.rs b/src/librustc/lint/internal.rs
index 030a9c1f935..0bafa93011e 100644
--- a/src/librustc/lint/internal.rs
+++ b/src/librustc/lint/internal.rs
@@ -100,7 +100,7 @@ fn lint_ty_kind_usage(cx: &LateContext<'_, '_>, segment: &PathSegment) -> bool {
     if segment.ident.as_str() == "TyKind" {
         if let Some(def) = segment.def {
             if let Some(did) = def.opt_def_id() {
-                return did.match_path(cx.tcx, &["rustc", "ty", "sty", "TyKind"]);
+                return cx.match_path(did, &["rustc", "ty", "sty", "TyKind"]);
             }
         }
     }