Convert dyn AstConv to AstConv

I expect this to have a perf impact because I think this is responsible for lowering types from
hir, and that the reason that lowering builtin derives is slow is because the paths are longer.
That lead me to find this, which I'm not sure if this is on the hot path or not. If it is, this
should certainly be a perf win.

Author: JulianKnodt

compiler/rustc_typeck/src/astconv/errors.rs

@@ -2,7 +2,7 @@
 
 use super::{check_fn, Expectation, FnCtxt, GeneratorTypes};
 
-use crate::astconv::AstConv;
+use crate::astconv::{self, AstConv};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::lang_items::LangItem;
@@ -538,17 +538,15 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         decl: &hir::FnDecl<'_>,
         body: &hir::Body<'_>,
     ) -> ty::PolyFnSig<'tcx> {
-        let astconv: &dyn AstConv<'_> = self;
-
         debug!(
             "supplied_sig_of_closure(decl={:?}, body.generator_kind={:?})",
             decl, body.generator_kind,
         );
 
         // First, convert the types that the user supplied (if any).
-        let supplied_arguments = decl.inputs.iter().map(|a| astconv.ast_ty_to_ty(a));
+        let supplied_arguments = decl.inputs.iter().map(|a| astconv::ast_ty_to_ty(self, a));
         let supplied_return = match decl.output {
-            hir::FnRetTy::Return(ref output) => astconv.ast_ty_to_ty(&output),
+            hir::FnRetTy::Return(ref output) => astconv::ast_ty_to_ty(self, &output),
             hir::FnRetTy::DefaultReturn(_) => match body.generator_kind {
                 // In the case of the async block that we create for a function body,
                 // we expect the return type of the block to match that of the enclosing
@@ -563,11 +561,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         // easily (and locally) prove that we
                         // *have* reported an
                         // error. --nikomatsakis
-                        astconv.ty_infer(None, decl.output.span())
+                        self.ty_infer(None, decl.output.span())
                     })
                 }
 
-                _ => astconv.ty_infer(None, decl.output.span()),
+                _ => self.ty_infer(None, decl.output.span()),
             },
         };
 
@@ -694,16 +692,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// so should yield an error, but returns back a signature where
     /// all parameters are of type `TyErr`.
     fn error_sig_of_closure(&self, decl: &hir::FnDecl<'_>) -> ty::PolyFnSig<'tcx> {
-        let astconv: &dyn AstConv<'_> = self;
-
         let supplied_arguments = decl.inputs.iter().map(|a| {
             // Convert the types that the user supplied (if any), but ignore them.
-            astconv.ast_ty_to_ty(a);
+            astconv::ast_ty_to_ty(self, a);
             self.tcx.ty_error()
         });
 
         if let hir::FnRetTy::Return(ref output) = decl.output {
-            astconv.ast_ty_to_ty(&output);
+            astconv::ast_ty_to_ty(self, &output);
         }
 
         let result = ty::Binder::dummy(self.tcx.mk_fn_sig(

compiler/rustc_typeck/src/astconv/generics.rs

@@ -35,7 +35,7 @@
 //! // and are then unable to coerce `&7i32` to `&mut i32`.
 //! ```
 
-use crate::astconv::AstConv;
+use crate::astconv;
 use crate::check::FnCtxt;
 use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
 use rustc_hir as hir;
@@ -1536,7 +1536,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
         if let hir::FnRetTy::Return(ty) = fn_output {
             // Get the return type.
             if let hir::TyKind::OpaqueDef(..) = ty.kind {
-                let ty = AstConv::ast_ty_to_ty(fcx, ty);
+                let ty = astconv::ast_ty_to_ty(fcx, ty);
                 // Get the `impl Trait`'s `DefId`.
                 if let ty::Opaque(def_id, _) = ty.kind() {
                     let hir_id = fcx.tcx.hir().local_def_id_to_hir_id(def_id.expect_local());
@@ -1598,7 +1598,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
     fn is_return_ty_unsized(&self, fcx: &FnCtxt<'a, 'tcx>, blk_id: hir::HirId) -> bool {
         if let Some((fn_decl, _)) = fcx.get_fn_decl(blk_id) {
             if let hir::FnRetTy::Return(ty) = fn_decl.output {
-                let ty = AstConv::ast_ty_to_ty(fcx, ty);
+                let ty = astconv::ast_ty_to_ty(fcx, ty);
                 if let ty::Dynamic(..) = ty.kind() {
                     return true;
                 }

compiler/rustc_typeck/src/astconv/mod.rs

@@ -1,5 +1,5 @@
 use crate::astconv::{
-    AstConv, CreateSubstsForGenericArgsCtxt, ExplicitLateBound, GenericArgCountMismatch,
+    self, AstConv, CreateSubstsForGenericArgsCtxt, ExplicitLateBound, GenericArgCountMismatch,
     GenericArgCountResult, PathSeg,
 };
 use crate::check::callee::{self, DeferredCallResolution};
@@ -454,7 +454,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     pub fn to_ty(&self, ast_t: &hir::Ty<'_>) -> Ty<'tcx> {
-        let t = AstConv::ast_ty_to_ty(self, ast_t);
+        let t = astconv::ast_ty_to_ty(self, ast_t);
         self.register_wf_obligation(t.into(), ast_t.span, traits::MiscObligation);
         t
     }
@@ -1144,7 +1144,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let path_segs = match res {
             Res::Local(_) | Res::SelfCtor(_) => vec![],
             Res::Def(kind, def_id) => {
-                AstConv::def_ids_for_value_path_segments(self, segments, self_ty, kind, def_id)
+                astconv::def_ids_for_value_path_segments(self, segments, self_ty, kind, def_id)
             }
             _ => bug!("instantiate_value_path on {:?}", res),
         };
@@ -1188,7 +1188,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // errors if type parameters are provided in an inappropriate place.
 
         let generic_segs: FxHashSet<_> = path_segs.iter().map(|PathSeg(_, index)| index).collect();
-        let generics_has_err = AstConv::prohibit_generics(
+        let generics_has_err = astconv::prohibit_generics(
             self,
             segments.iter().enumerate().filter_map(|(index, seg)| {
                 if !generic_segs.contains(&index) || is_alias_variant_ctor {
@@ -1229,7 +1229,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             if let GenericArgCountResult {
                 correct: Err(GenericArgCountMismatch { reported: Some(ErrorReported), .. }),
                 ..
-            } = AstConv::check_generic_arg_count_for_call(
+            } = astconv::generics::check_generic_arg_count_for_call(
                 tcx, span, &generics, &seg, false, // `is_method_call`
             ) {
                 infer_args_for_err.insert(index);
@@ -1332,7 +1332,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             ) -> subst::GenericArg<'tcx> {
                 match (&param.kind, arg) {
                     (GenericParamDefKind::Lifetime, GenericArg::Lifetime(lt)) => {
-                        AstConv::ast_region_to_region(self.fcx, lt, Some(param)).into()
+                        astconv::ast_region_to_region(self.fcx, lt, Some(param)).into()
                     }
                     (GenericParamDefKind::Type { .. }, GenericArg::Type(ty)) => {
                         self.fcx.to_ty(ty).into()
@@ -1385,7 +1385,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
 
         let substs = self_ctor_substs.unwrap_or_else(|| {
-            AstConv::create_substs_for_generic_args(
+            astconv::generics::create_substs_for_generic_args(
                 tcx,
                 def_id,
                 &[][..],

compiler/rustc_typeck/src/check/closure.rs

@@ -1,4 +1,4 @@
-use crate::astconv::AstConv;
+use crate::astconv::{self, AstConv};
 use crate::check::coercion::CoerceMany;
 use crate::check::method::MethodCallee;
 use crate::check::Expectation::*;
@@ -860,7 +860,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         match *qpath {
             QPath::Resolved(ref maybe_qself, ref path) => {
                 let self_ty = maybe_qself.as_ref().map(|qself| self.to_ty(qself));
-                let ty = AstConv::res_to_ty(self, self_ty, path, true);
+                let ty = astconv::res_to_ty(self, self_ty, path, true);
                 (path.res, ty)
             }
             QPath::TypeRelative(ref qself, ref segment) => {
@@ -872,7 +872,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     Res::Err
                 };
                 let result =
-                    AstConv::associated_path_to_ty(self, hir_id, path_span, ty, res, segment, true);
+                    astconv::associated_path_to_ty(self, hir_id, path_span, ty, res, segment, true);
                 let ty = result.map(|(ty, _, _)| ty).unwrap_or_else(|_| self.tcx().ty_error());
                 let result = result.map(|(_, kind, def_id)| (kind, def_id));
 
@@ -985,7 +985,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                         // would trigger in `is_send::<T::AssocType>();`
                                         // from `typeck-default-trait-impl-assoc-type.rs`.
                                     } else {
-                                        let ty = AstConv::ast_ty_to_ty(self, hir_ty);
+                                        let ty = astconv::ast_ty_to_ty(self, hir_ty);
                                         let ty = self.resolve_vars_if_possible(ty);
                                         if ty == predicate.self_ty() {
                                             error.obligation.cause.make_mut().span = hir_ty.span;

compiler/rustc_typeck/src/check/coercion.rs

@@ -6,7 +6,7 @@ pub use _impl::*;
 pub use checks::*;
 pub use suggestions::*;
 
-use crate::astconv::AstConv;
+use crate::astconv::{self, AstConv};
 use crate::check::coercion::DynamicCoerceMany;
 use crate::check::{Diverges, EnclosingBreakables, Inherited, UnsafetyState};
 
@@ -265,7 +265,7 @@ impl<'a, 'tcx> AstConv<'tcx> for FnCtxt<'a, 'tcx> {
             poly_trait_ref,
         );
 
-        let item_substs = <dyn AstConv<'tcx>>::create_substs_for_associated_item(
+        let item_substs = astconv::create_substs_for_associated_item(
             self,
             self.tcx,
             span,

compiler/rustc_typeck/src/check/fn_ctxt/_impl.rs

@@ -1,5 +1,5 @@
 use super::FnCtxt;
-use crate::astconv::AstConv;
+use crate::astconv;
 
 use rustc_ast::util::parser::ExprPrecedence;
 use rustc_span::{self, Span};
@@ -419,7 +419,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 // are not, the expectation must have been caused by something else.
                 debug!("suggest_missing_return_type: return type {:?} node {:?}", ty, ty.kind);
                 let sp = ty.span;
-                let ty = AstConv::ast_ty_to_ty(self, ty);
+                let ty = astconv::ast_ty_to_ty(self, ty);
                 debug!("suggest_missing_return_type: return type {:?}", ty);
                 debug!("suggest_missing_return_type: expected type {:?}", ty);
                 if ty.kind() == expected.kind() {

compiler/rustc_typeck/src/check/fn_ctxt/checks.rs

@@ -1,6 +1,6 @@
 use super::{probe, MethodCallee};
 
-use crate::astconv::{AstConv, CreateSubstsForGenericArgsCtxt};
+use crate::astconv::{self, CreateSubstsForGenericArgsCtxt};
 use crate::check::{callee, FnCtxt};
 use crate::hir::def_id::DefId;
 use crate::hir::GenericArg;
@@ -298,7 +298,7 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
         // If they were not explicitly supplied, just construct fresh
         // variables.
         let generics = self.tcx.generics_of(pick.item.def_id);
-        let arg_count_correct = AstConv::check_generic_arg_count_for_call(
+        let arg_count_correct = astconv::generics::check_generic_arg_count_for_call(
             self.tcx, self.span, &generics, &seg, true, // `is_method_call`
         );
 
@@ -331,7 +331,7 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
             ) -> subst::GenericArg<'tcx> {
                 match (&param.kind, arg) {
                     (GenericParamDefKind::Lifetime, GenericArg::Lifetime(lt)) => {
-                        AstConv::ast_region_to_region(self.cfcx.fcx, lt, Some(param)).into()
+                        astconv::ast_region_to_region(self.cfcx.fcx, lt, Some(param)).into()
                     }
                     (GenericParamDefKind::Type { .. }, GenericArg::Type(ty)) => {
                         self.cfcx.to_ty(ty).into()
@@ -352,7 +352,7 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
                 self.cfcx.var_for_def(self.cfcx.span, param)
             }
         }
-        AstConv::create_substs_for_generic_args(
+        astconv::generics::create_substs_for_generic_args(
             self.tcx,
             pick.item.def_id,
             parent_substs,