Move Place::elem methods and friends to TyCtxt

src/librustc/mir/mod.rs

@@ -1857,51 +1857,6 @@ impl<'tcx> Place<'tcx> {
         }
     }
 
-    pub fn field(self, f: Field, ty: Ty<'tcx>, tcx: TyCtxt<'tcx>) -> Place<'tcx> {
-        self.elem(ProjectionElem::Field(f, ty), tcx)
-    }
-
-    pub fn deref(self, tcx: TyCtxt<'tcx>) -> Place<'tcx> {
-        self.elem(ProjectionElem::Deref, tcx)
-    }
-
-    pub fn downcast(
-        self,
-        adt_def: &'tcx AdtDef,
-        variant_index: VariantIdx,
-        tcx: TyCtxt<'tcx>,
-    ) -> Place<'tcx> {
-        self.elem(
-            ProjectionElem::Downcast(
-                Some(adt_def.variants[variant_index].ident.name),
-                variant_index,
-            ),
-            tcx,
-        )
-    }
-
-    pub fn downcast_unnamed(self, variant_index: VariantIdx, tcx: TyCtxt<'tcx>) -> Place<'tcx> {
-        self.elem(ProjectionElem::Downcast(None, variant_index), tcx)
-    }
-
-    pub fn index(self, index: Local, tcx: TyCtxt<'tcx>) -> Place<'tcx> {
-        self.elem(ProjectionElem::Index(index), tcx)
-    }
-
-    /// This method copies `Place`'s projection, add an element and reintern it. Should not be used
-    /// to build a full `Place` it's just a convenient way to grab a projection and modify it in
-    /// flight.
-    // FIXME: It may be a better idea to move all these methods to `PlaceBuilder`
-    pub fn elem(self, elem: PlaceElem<'tcx>, tcx: TyCtxt<'tcx>) -> Place<'tcx> {
-        let mut projection = self.projection.to_vec();
-        projection.push(elem);
-
-        Place {
-            base: self.base,
-            projection: tcx.intern_place_elems(&projection),
-        }
-    }
-
     /// Returns `true` if this `Place` contains a `Deref` projection.
     ///
     /// If `Place::is_indirect` returns false, the caller knows that the `Place` refers to the

src/librustc/ty/context.rs

@@ -21,7 +21,7 @@ use crate::middle::cstore::EncodedMetadata;
 use crate::middle::lang_items;
 use crate::middle::resolve_lifetime::{self, ObjectLifetimeDefault};
 use crate::middle::stability;
-use crate::mir::{Body, interpret, PlaceElem, ProjectionKind, Promoted};
+use crate::mir::{Body, Field, interpret, Local, Place, PlaceElem, ProjectionKind, Promoted};
 use crate::mir::interpret::{ConstValue, Allocation, Scalar};
 use crate::ty::subst::{GenericArg, InternalSubsts, SubstsRef, Subst};
 use crate::ty::ReprOptions;
@@ -2597,6 +2597,48 @@ impl<'tcx> TyCtxt<'tcx> {
         self.mk_ty(Opaque(def_id, substs))
     }
 
+    pub fn mk_place_field(self, place: Place<'tcx>, f: Field, ty: Ty<'tcx>) -> Place<'tcx> {
+        self.mk_place_elem(place, PlaceElem::Field(f, ty))
+    }
+
+    pub fn mk_place_deref(self, place: Place<'tcx>) -> Place<'tcx> {
+        self.mk_place_elem(place, PlaceElem::Deref)
+    }
+
+    pub fn mk_place_downcast(
+        self,
+        place: Place<'tcx>,
+        adt_def: &'tcx AdtDef,
+        variant_index: VariantIdx,
+    ) -> Place<'tcx> {
+        self.mk_place_elem(
+            place,
+            PlaceElem::Downcast(Some(adt_def.variants[variant_index].ident.name), variant_index),
+        )
+    }
+
+    pub fn mk_place_downcast_unnamed(
+        self,
+        place: Place<'tcx>,
+        variant_index: VariantIdx,
+    ) -> Place<'tcx> {
+        self.mk_place_elem(place, PlaceElem::Downcast(None, variant_index))
+    }
+
+    pub fn mk_place_index(self, place: Place<'tcx>, index: Local) -> Place<'tcx> {
+        self.mk_place_elem(place, PlaceElem::Index(index))
+    }
+
+    /// This method copies `Place`'s projection, add an element and reintern it. Should not be used
+    /// to build a full `Place` it's just a convenient way to grab a projection and modify it in
+    /// flight.
+    pub fn mk_place_elem(self, place: Place<'tcx>, elem: PlaceElem<'tcx>) -> Place<'tcx> {
+        let mut projection = place.projection.to_vec();
+        projection.push(elem);
+
+        Place { base: place.base, projection: self.intern_place_elems(&projection) }
+    }
+
     pub fn intern_existential_predicates(self, eps: &[ExistentialPredicate<'tcx>])
         -> &'tcx List<ExistentialPredicate<'tcx>> {
         assert!(!eps.is_empty());

src/librustc_mir/build/expr/as_rvalue.rs

@@ -139,7 +139,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 // initialize the box contents:
                 unpack!(
                     block = this.into(
-                        &Place::from(result).deref(this.hir.tcx()),
+                        &this.hir.tcx().mk_place_deref(Place::from(result)),
                         block, value
                     )
                 );
@@ -296,10 +296,10 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                         .zip(field_types.into_iter())
                         .map(|(n, ty)| match fields_map.get(&n) {
                             Some(v) => v.clone(),
-                            None => this.consume_by_copy_or_move(base.clone().field(
+                            None => this.consume_by_copy_or_move(this.hir.tcx().mk_place_field(
+                                base.clone(),
                                 n,
                                 ty,
-                                this.hir.tcx(),
                             )),
                         })
                         .collect()
@@ -402,8 +402,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             let val_fld = Field::new(0);
             let of_fld = Field::new(1);
 
-            let val = result_value.clone().field(val_fld, ty, self.hir.tcx());
-            let of = result_value.field(of_fld, bool_ty, self.hir.tcx());
+            let tcx = self.hir.tcx();
+            let val = tcx.mk_place_field(result_value.clone(), val_fld, ty);
+            let of = tcx.mk_place_field(result_value, of_fld, bool_ty);
 
             let err = PanicInfo::Overflow(op);
 

src/librustc_mir/build/expr/into.rs

@@ -235,7 +235,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     });
                     let ptr_temp = Place::from(ptr_temp);
                     let block = unpack!(this.into(&ptr_temp, block, ptr));
-                    this.into(&ptr_temp.deref(this.hir.tcx()), block, val)
+                    this.into(&this.hir.tcx().mk_place_deref(ptr_temp), block, val)
                 } else {
                     let args: Vec<_> = args
                         .into_iter()

src/librustc_mir/build/matches/simplify.rs

@@ -166,7 +166,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     }
                 });
                 if irrefutable {
-                    let place = match_pair.place.downcast(adt_def, variant_index, tcx);
+                    let place = tcx.mk_place_downcast(match_pair.place, adt_def, variant_index);
                     candidate.match_pairs.extend(self.field_match_pairs(place, subpatterns));
                     Ok(())
                 } else {
@@ -191,7 +191,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             }
 
             PatKind::Deref { ref subpattern } => {
-                let place = match_pair.place.deref(tcx);
+                let place = tcx.mk_place_deref(match_pair.place);
                 candidate.match_pairs.push(MatchPair::new(place, subpattern));
                 Ok(())
             }

src/librustc_mir/build/matches/test.rs

@@ -743,23 +743,21 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         candidate: &mut Candidate<'pat, 'tcx>,
     ) {
         let match_pair = candidate.match_pairs.remove(match_pair_index);
+        let tcx = self.hir.tcx();
 
         // So, if we have a match-pattern like `x @ Enum::Variant(P1, P2)`,
         // we want to create a set of derived match-patterns like
         // `(x as Variant).0 @ P1` and `(x as Variant).1 @ P1`.
         let elem = ProjectionElem::Downcast(
             Some(adt_def.variants[variant_index].ident.name), variant_index);
-        let downcast_place = match_pair.place.elem(elem, self.hir.tcx()); // `(x as Variant)`
-        let consequent_match_pairs =
-            subpatterns.iter()
-                       .map(|subpattern| {
-                           // e.g., `(x as Variant).0`
-                           let place = downcast_place.clone().field(subpattern.field,
-                                                                    subpattern.pattern.ty,
-                                                                    self.hir.tcx());
-                           // e.g., `(x as Variant).0 @ P1`
-                           MatchPair::new(place, &subpattern.pattern)
-                       });
+        let downcast_place = tcx.mk_place_elem(match_pair.place, elem); // `(x as Variant)`
+        let consequent_match_pairs = subpatterns.iter().map(|subpattern| {
+            // e.g., `(x as Variant).0`
+            let place =
+                tcx.mk_place_field(downcast_place.clone(), subpattern.field, subpattern.pattern.ty);
+            // e.g., `(x as Variant).0 @ P1`
+            MatchPair::new(place, &subpattern.pattern)
+        });
 
         candidate.match_pairs.extend(consequent_match_pairs);
     }

src/librustc_mir/build/matches/util.rs

@@ -6,18 +6,22 @@ use std::u32;
 use std::convert::TryInto;
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
-    pub fn field_match_pairs<'pat>(&mut self,
-                                   place: Place<'tcx>,
-                                   subpatterns: &'pat [FieldPat<'tcx>])
-                                   -> Vec<MatchPair<'pat, 'tcx>> {
-        subpatterns.iter()
-                   .map(|fieldpat| {
-                       let place = place.clone().field(fieldpat.field,
-                                                       fieldpat.pattern.ty,
-                                                       self.hir.tcx());
-                       MatchPair::new(place, &fieldpat.pattern)
-                   })
-                   .collect()
+    pub fn field_match_pairs<'pat>(
+        &mut self,
+        place: Place<'tcx>,
+        subpatterns: &'pat [FieldPat<'tcx>],
+    ) -> Vec<MatchPair<'pat, 'tcx>> {
+        subpatterns
+            .iter()
+            .map(|fieldpat| {
+                let place = self.hir.tcx().mk_place_field(
+                    place.clone(),
+                    fieldpat.field,
+                    fieldpat.pattern.ty,
+                );
+                MatchPair::new(place, &fieldpat.pattern)
+            })
+            .collect()
     }
 
     pub fn prefix_slice_suffix<'pat>(&mut self,
@@ -28,6 +32,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                                      suffix: &'pat [Pat<'tcx>]) {
         let min_length = prefix.len() + suffix.len();
         let min_length = min_length.try_into().unwrap();
+        let tcx = self.hir.tcx();
 
         match_pairs.extend(
             prefix.iter()
@@ -38,16 +43,16 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                           min_length,
                           from_end: false,
                       };
-                      let place = place.clone().elem(elem, self.hir.tcx());
+                      let place = tcx.mk_place_elem(place.clone(), elem);
                       MatchPair::new(place, subpattern)
                   })
         );
 
         if let Some(subslice_pat) = opt_slice {
-            let subslice = place.clone().elem(ProjectionElem::Subslice {
+            let subslice = tcx.mk_place_elem(place.clone(),ProjectionElem::Subslice {
                 from: prefix.len() as u32,
                 to: suffix.len() as u32
-            }, self.hir.tcx());
+            });
             match_pairs.push(MatchPair::new(subslice, subslice_pat));
         }
 
@@ -61,7 +66,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                           min_length,
                           from_end: true,
                       };
-                      let place = place.clone().elem(elem, self.hir.tcx());
+                      let place = tcx.mk_place_elem(place.clone(), elem);
                       MatchPair::new(place, subpattern)
                   })
         );

src/librustc_mir/dataflow/move_paths/builder.rs

@@ -274,7 +274,7 @@ impl<'b, 'a, 'tcx> Gatherer<'b, 'a, 'tcx> {
                     // Box starts out uninitialized - need to create a separate
                     // move-path for the interior so it will be separate from
                     // the exterior.
-                    self.create_move_path(&place.clone().deref(self.builder.tcx));
+                    self.create_move_path(&self.builder.tcx.mk_place_deref(place.clone()));
                     self.gather_init(place.as_ref(), InitKind::Shallow);
                 } else {
                     self.gather_init(place.as_ref(), InitKind::Deep);

src/librustc_mir/shim.rs

@@ -231,7 +231,7 @@ fn build_drop_shim<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId, ty: Option<Ty<'tcx>>)
                 tcx,
                 param_env
             };
-            let dropee = dropee_ptr.deref(tcx);
+            let dropee = tcx.mk_place_deref(dropee_ptr);
             let resume_block = elaborator.patch.resume_block();
             elaborate_drops::elaborate_drop(
                 &mut elaborator,
@@ -312,7 +312,7 @@ fn build_clone_shim<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId, self_ty: Ty<'tcx>) -
     let is_copy = self_ty.is_copy_modulo_regions(tcx, param_env, builder.span);
 
     let dest = Place::return_place();
-    let src = Place::from(Local::new(1+0)).deref(tcx);
+    let src = tcx.mk_place_deref(Place::from(Local::new(1+0)));
 
     match self_ty.kind {
         _ if is_copy => builder.copy_shim(),
@@ -415,7 +415,7 @@ impl CloneShimBuilder<'tcx> {
     }
 
     fn copy_shim(&mut self) {
-        let rcvr = Place::from(Local::new(1+0)).deref(self.tcx);
+        let rcvr = self.tcx.mk_place_deref(Place::from(Local::new(1+0)));
         let ret_statement = self.make_statement(
             StatementKind::Assign(
                 box(
@@ -561,8 +561,8 @@ impl CloneShimBuilder<'tcx> {
         // BB #2
         // `dest[i] = Clone::clone(src[beg])`;
         // Goto #3 if ok, #5 if unwinding happens.
-        let dest_field = dest.clone().index(beg, self.tcx);
-        let src_field = src.index(beg, self.tcx);
+        let dest_field = self.tcx.mk_place_index(dest.clone(), beg);
+        let src_field = self.tcx.mk_place_index(src, beg);
         self.make_clone_call(dest_field, src_field, ty, BasicBlock::new(3),
                              BasicBlock::new(5));
 
@@ -616,7 +616,7 @@ impl CloneShimBuilder<'tcx> {
         // BB #7 (cleanup)
         // `drop(dest[beg])`;
         self.block(vec![], TerminatorKind::Drop {
-            location: dest.index(beg, self.tcx),
+            location: self.tcx.mk_place_index(dest, beg),
             target: BasicBlock::new(8),
             unwind: None,
         }, true);
@@ -648,9 +648,9 @@ impl CloneShimBuilder<'tcx> {
         let mut previous_field = None;
         for (i, ity) in tys.enumerate() {
             let field = Field::new(i);
-            let src_field = src.clone().field(field, ity, self.tcx);
+            let src_field = self.tcx.mk_place_field(src.clone(), field, ity);
 
-            let dest_field = dest.clone().field(field, ity, self.tcx);
+            let dest_field = self.tcx.mk_place_field(dest.clone(), field, ity);
 
             // #(2i + 1) is the cleanup block for the previous clone operation
             let cleanup_block = self.block_index_offset(1);
@@ -721,14 +721,14 @@ fn build_call_shim<'tcx>(
 
     let rcvr = match rcvr_adjustment {
         Adjustment::Identity => Operand::Move(rcvr_l),
-        Adjustment::Deref => Operand::Copy(rcvr_l.deref(tcx)),
+        Adjustment::Deref => Operand::Copy(tcx.mk_place_deref(rcvr_l)),
         Adjustment::DerefMove => {
             // fn(Self, ...) -> fn(*mut Self, ...)
             let arg_ty = local_decls[rcvr_arg].ty;
             debug_assert!(tcx.generics_of(def_id).has_self && arg_ty == tcx.types.self_param);
             local_decls[rcvr_arg].ty = tcx.mk_mut_ptr(arg_ty);
 
-            Operand::Move(rcvr_l.deref(tcx))
+            Operand::Move(tcx.mk_place_deref(rcvr_l))
         }
         Adjustment::RefMut => {
             // let rcvr = &mut rcvr;
@@ -772,7 +772,7 @@ fn build_call_shim<'tcx>(
     if let Some(untuple_args) = untuple_args {
         args.extend(untuple_args.iter().enumerate().map(|(i, ity)| {
             let arg_place = Place::from(Local::new(1+1));
-            Operand::Move(arg_place.field(Field::new(i), *ity, tcx))
+            Operand::Move(tcx.mk_place_field(arg_place, Field::new(i), *ity))
         }));
     } else {
         args.extend((1..sig.inputs().len()).map(|i| {

src/librustc_mir/transform/generator.rs

@@ -246,7 +246,7 @@ impl TransformVisitor<'tcx> {
     // Create a Place referencing a generator struct field
     fn make_field(&self, variant_index: VariantIdx, idx: usize, ty: Ty<'tcx>) -> Place<'tcx> {
         let self_place = Place::from(self_arg());
-        let base = self_place.downcast_unnamed(variant_index, self.tcx);
+        let base = self.tcx.mk_place_downcast_unnamed(self_place, variant_index);
         let mut projection = base.projection.to_vec();
         projection.push(ProjectionElem::Field(Field::new(idx), ty));