Auto merge of #60815 - nnethercote:use-Symbol-more-2, r=<try>

Use `Symbol` even more

These patches simplify the code a bit (fewer conversions) and also speed things up a bit (fewer `with_interner` calls).

r? @petrochenkov

Author: bors

src/librustc/hir/map/definitions.rs

@@ -593,7 +593,7 @@ impl DefPathData {
             ImplTrait => "{{opaque}}",
         };
 
-        Symbol::intern(s).as_interned_str()
+        InternedString::intern(s)
     }
 
     pub fn to_string(&self) -> String {

src/librustc/hir/mod.rs

@@ -16,7 +16,7 @@ use crate::util::nodemap::{NodeMap, FxHashSet};
 use crate::mir::mono::Linkage;
 
 use errors::FatalError;
-use syntax_pos::{Span, DUMMY_SP, symbol::InternedString};
+use syntax_pos::{Span, DUMMY_SP};
 use syntax::source_map::Spanned;
 use rustc_target::spec::abi::Abi;
 use syntax::ast::{self, CrateSugar, Ident, Name, NodeId, AsmDialect};
@@ -609,9 +609,9 @@ impl Generics {
         own_counts
     }
 
-    pub fn get_named(&self, name: &InternedString) -> Option<&GenericParam> {
+    pub fn get_named(&self, name: Symbol) -> Option<&GenericParam> {
         for param in &self.params {
-            if *name == param.name.ident().as_interned_str() {
+            if name == param.name.ident().name {
                 return Some(param);
             }
         }

src/librustc/infer/error_reporting/mod.rs

@@ -194,20 +194,20 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
                 let mut sp = cm.def_span(self.hir().span_by_hir_id(node));
                 if let Some(param) = self.hir()
                     .get_generics(scope)
-                    .and_then(|generics| generics.get_named(&br.name))
+                    .and_then(|generics| generics.get_named(br.name))
                 {
                     sp = param.span;
                 }
                 (format!("the lifetime {} as defined on", br.name), sp)
             }
             ty::ReFree(ty::FreeRegion {
-                bound_region: ty::BoundRegion::BrNamed(_, ref name),
+                bound_region: ty::BoundRegion::BrNamed(_, name),
                 ..
             }) => {
                 let mut sp = cm.def_span(self.hir().span_by_hir_id(node));
                 if let Some(param) = self.hir()
                     .get_generics(scope)
-                    .and_then(|generics| generics.get_named(&name))
+                    .and_then(|generics| generics.get_named(name))
                 {
                     sp = param.span;
                 }

src/librustc/infer/mod.rs

@@ -32,7 +32,7 @@ use std::cell::{Cell, Ref, RefCell, RefMut};
 use std::collections::BTreeMap;
 use std::fmt;
 use syntax::ast;
-use syntax_pos::symbol::InternedString;
+use syntax_pos::symbol::Symbol;
 use syntax_pos::Span;
 
 use self::combine::CombineFields;
@@ -383,7 +383,7 @@ pub enum RegionVariableOrigin {
     Coercion(Span),
 
     /// Region variables created as the values for early-bound regions
-    EarlyBoundRegion(Span, InternedString),
+    EarlyBoundRegion(Span, Symbol),
 
     /// Region variables created for bound regions
     /// in a function or method that is called

src/librustc/infer/type_variable.rs

@@ -1,4 +1,4 @@
-use syntax::symbol::InternedString;
+use syntax::symbol::Symbol;
 use syntax_pos::Span;
 use crate::ty::{self, Ty, TyVid};
 
@@ -43,7 +43,7 @@ pub enum TypeVariableOrigin {
     MiscVariable(Span),
     NormalizeProjectionType(Span),
     TypeInference(Span),
-    TypeParameterDefinition(Span, InternedString),
+    TypeParameterDefinition(Span, Symbol),
 
     /// one of the upvars or closure kind parameters in a `ClosureSubsts`
     /// (before it has been determined)

src/librustc/infer/unify_key.rs

@@ -3,7 +3,7 @@ use crate::mir::interpret::ConstValue;
 use rustc_data_structures::unify::{NoError, EqUnifyValue, UnifyKey, UnifyValue, UnificationTable};
 use rustc_data_structures::unify::InPlace;
 use syntax_pos::{Span, DUMMY_SP};
-use syntax::symbol::InternedString;
+use syntax::symbol::Symbol;
 
 use std::cmp;
 use std::marker::PhantomData;
@@ -84,7 +84,7 @@ impl ToType for FloatVarValue {
 pub enum ConstVariableOrigin {
     MiscVariable(Span),
     ConstInference(Span),
-    ConstParameterDefinition(Span, InternedString),
+    ConstParameterDefinition(Span, Symbol),
     SubstitutionPlaceholder(Span),
 }
 

src/librustc/lint/context.rs

@@ -828,8 +828,8 @@ impl<'a, 'tcx> LateContext<'a, 'tcx> {
 
                 // 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(),
+                    Some(trait_ref) => LocalInternedString::intern(&format!("{:?}", trait_ref)),
+                    None => LocalInternedString::intern(&format!("<{}>", self_ty)),
                 }])
             }
 
@@ -845,9 +845,10 @@ impl<'a, 'tcx> LateContext<'a, 'tcx> {
                 // 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()
+                        LocalInternedString::intern(&format!("<impl {} for {}>", trait_ref,
+                                                    self_ty))
                     },
-                    None => Symbol::intern(&format!("<impl {}>", self_ty)).as_str(),
+                    None => LocalInternedString::intern(&format!("<impl {}>", self_ty)),
                 });
 
                 Ok(path)

src/librustc/mir/mono.rs

@@ -1,6 +1,6 @@
 use crate::hir::def_id::{DefId, CrateNum, LOCAL_CRATE};
 use crate::hir::HirId;
-use syntax::symbol::{Symbol, InternedString};
+use syntax::symbol::InternedString;
 use crate::ty::{Instance, TyCtxt};
 use crate::util::nodemap::FxHashMap;
 use rustc_data_structures::base_n;
@@ -280,7 +280,7 @@ impl<'a, 'gcx: 'tcx, 'tcx: 'a> CodegenUnitNameBuilder<'a, 'gcx, 'tcx> {
             cgu_name
         } else {
             let cgu_name = &cgu_name.as_str()[..];
-            Symbol::intern(&CodegenUnit::mangle_name(cgu_name)).as_interned_str()
+            InternedString::intern(&CodegenUnit::mangle_name(cgu_name))
         }
     }
 
@@ -336,6 +336,6 @@ impl<'a, 'gcx: 'tcx, 'tcx: 'a> CodegenUnitNameBuilder<'a, 'gcx, 'tcx> {
             write!(cgu_name, ".{}", special_suffix).unwrap();
         }
 
-        Symbol::intern(&cgu_name[..]).as_interned_str()
+        InternedString::intern(&cgu_name[..])
     }
 }

src/librustc/traits/object_safety.rs

@@ -539,7 +539,7 @@ impl<'a, 'tcx> TyCtxt<'a, 'tcx, 'tcx> {
         // are implemented
         let unsized_self_ty: Ty<'tcx> = self.mk_ty_param(
             ::std::u32::MAX,
-            Name::intern("RustaceansAreAwesome").as_interned_str(),
+            Name::intern("RustaceansAreAwesome"),
         );
 
         // `Receiver[Self => U]`

src/librustc/traits/on_unimplemented.rs

@@ -250,7 +250,7 @@ impl<'a, 'gcx, 'tcx> OnUnimplementedFormatString {
                     Position::ArgumentNamed(s) if s == "from_desugaring" => (),
                     // So is `{A}` if A is a type parameter
                     Position::ArgumentNamed(s) => match generics.params.iter().find(|param|
-                        param.name == s
+                        param.name.as_str() == s
                     ) {
                         Some(_) => (),
                         None => {