Auto merge of #97287 - compiler-errors:type-interner, r=jackh726,oli-obk

Move things to `rustc_type_ir`

Finishes some work proposed in rust-lang/compiler-team#341.

r? `@ghost`

Cargo.lock

@@ -3676,6 +3676,7 @@ dependencies = [
  "rustc_span",
  "rustc_target",
  "rustc_trait_selection",
+ "rustc_type_ir",
  "tracing",
 ]
 
@@ -3969,6 +3970,7 @@ dependencies = [
  "rustc_span",
  "rustc_target",
  "rustc_trait_selection",
+ "rustc_type_ir",
  "tracing",
  "unicode-security",
 ]
@@ -4041,6 +4043,7 @@ dependencies = [
  "rustc_session",
  "rustc_span",
  "rustc_target",
+ "rustc_type_ir",
  "smallvec",
  "snap",
  "tracing",
@@ -4262,6 +4265,7 @@ dependencies = [
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
+ "rustc_type_ir",
  "tracing",
 ]
 
@@ -4283,6 +4287,7 @@ dependencies = [
  "rustc_session",
  "rustc_span",
  "rustc_target",
+ "rustc_type_ir",
  "smallvec",
  "tracing",
 ]
@@ -4472,6 +4477,7 @@ dependencies = [
  "rustc_span",
  "rustc_target",
  "rustc_trait_selection",
+ "rustc_type_ir",
  "tracing",
 ]
 
@@ -4484,6 +4490,7 @@ dependencies = [
  "rustc_index",
  "rustc_macros",
  "rustc_serialize",
+ "smallvec",
 ]
 
 [[package]]
@@ -4509,6 +4516,7 @@ dependencies = [
  "rustc_target",
  "rustc_trait_selection",
  "rustc_ty_utils",
+ "rustc_type_ir",
  "smallvec",
  "tracing",
 ]

compiler/rustc_borrowck/src/lib.rs

@@ -98,7 +98,11 @@ struct Upvar<'tcx> {
     by_ref: bool,
 }
 
-const DEREF_PROJECTION: &[PlaceElem<'_>; 1] = &[ProjectionElem::Deref];
+/// Associate some local constants with the `'tcx` lifetime
+struct TyCtxtConsts<'tcx>(TyCtxt<'tcx>);
+impl<'tcx> TyCtxtConsts<'tcx> {
+    const DEREF_PROJECTION: &'tcx [PlaceElem<'tcx>; 1] = &[ProjectionElem::Deref];
+}
 
 pub fn provide(providers: &mut Providers) {
     *providers = Providers {
@@ -1443,7 +1447,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 // Thread-locals might be dropped after the function exits
                 // We have to dereference the outer reference because
                 // borrows don't conflict behind shared references.
-                root_place.projection = DEREF_PROJECTION;
+                root_place.projection = TyCtxtConsts::DEREF_PROJECTION;
                 (true, true)
             } else {
                 (false, self.locals_are_invalidated_at_exit)

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -33,7 +33,7 @@ use rustc_middle::mir::{self, GeneratorLayout};
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::layout::TyAndLayout;
 use rustc_middle::ty::subst::GenericArgKind;
-use rustc_middle::ty::{self, AdtKind, Instance, ParamEnv, Ty, TyCtxt, COMMON_VTABLE_ENTRIES};
+use rustc_middle::ty::{self, AdtKind, Instance, ParamEnv, Ty, TyCtxt};
 use rustc_session::config::{self, DebugInfo};
 use rustc_span::symbol::Symbol;
 use rustc_span::FileName;
@@ -1392,7 +1392,7 @@ fn build_vtable_type_di_node<'ll, 'tcx>(
 
         tcx.vtable_entries(trait_ref)
     } else {
-        COMMON_VTABLE_ENTRIES
+        TyCtxt::COMMON_VTABLE_ENTRIES
     };
 
     // All function pointers are described as opaque pointers. This could be improved in the future

compiler/rustc_const_eval/Cargo.toml

@@ -24,3 +24,4 @@ rustc_session = { path = "../rustc_session" }
 rustc_target = { path = "../rustc_target" }
 rustc_trait_selection = { path = "../rustc_trait_selection" }
 rustc_span = { path = "../rustc_span" }
+rustc_type_ir = { path = "../rustc_type_ir" }

compiler/rustc_const_eval/src/interpret/cast.rs

@@ -8,6 +8,7 @@ use rustc_middle::ty::adjustment::PointerCast;
 use rustc_middle::ty::layout::{IntegerExt, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, FloatTy, Ty, TypeAndMut};
 use rustc_target::abi::{Integer, Variants};
+use rustc_type_ir::sty::TyKind::*;
 
 use super::{
     util::ensure_monomorphic_enough, FnVal, ImmTy, Immediate, InterpCx, Machine, OpTy, PlaceTy,
@@ -102,7 +103,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         src: &ImmTy<'tcx, M::PointerTag>,
         cast_ty: Ty<'tcx>,
     ) -> InterpResult<'tcx, Immediate<M::PointerTag>> {
-        use rustc_middle::ty::TyKind::*;
+        use rustc_type_ir::sty::TyKind::*;
         trace!("Casting {:?}: {:?} to {:?}", *src, src.layout.ty, cast_ty);
 
         match src.layout.ty.kind() {
@@ -205,7 +206,6 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         let v = scalar.to_bits(src_layout.size)?;
         let v = if signed { self.sign_extend(v, src_layout) } else { v };
         trace!("cast_from_scalar: {}, {} -> {}", v, src_layout.ty, cast_ty);
-        use rustc_middle::ty::TyKind::*;
 
         Ok(match *cast_ty.kind() {
             Int(_) | Uint(_) => {
@@ -247,7 +247,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
     where
         F: Float + Into<Scalar<M::PointerTag>> + FloatConvert<Single> + FloatConvert<Double>,
     {
-        use rustc_middle::ty::TyKind::*;
+        use rustc_type_ir::sty::TyKind::*;
         match *dest_ty.kind() {
             // float -> uint
             Uint(t) => {

compiler/rustc_const_eval/src/interpret/traits.rs

@@ -2,8 +2,8 @@ use std::convert::TryFrom;
 
 use rustc_middle::mir::interpret::{InterpResult, Pointer, PointerArithmetic};
 use rustc_middle::ty::{
-    self, Ty, COMMON_VTABLE_ENTRIES, COMMON_VTABLE_ENTRIES_ALIGN,
-    COMMON_VTABLE_ENTRIES_DROPINPLACE, COMMON_VTABLE_ENTRIES_SIZE,
+    self, Ty, TyCtxt, COMMON_VTABLE_ENTRIES_ALIGN, COMMON_VTABLE_ENTRIES_DROPINPLACE,
+    COMMON_VTABLE_ENTRIES_SIZE,
 };
 use rustc_target::abi::{Align, Size};
 
@@ -38,7 +38,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
     }
 
     /// Resolves the function at the specified slot in the provided
-    /// vtable. Currently an index of '3' (`COMMON_VTABLE_ENTRIES.len()`)
+    /// vtable. Currently an index of '3' (`TyCtxt::COMMON_VTABLE_ENTRIES.len()`)
     /// corresponds to the first method declared in the trait of the provided vtable.
     pub fn get_vtable_slot(
         &self,
@@ -64,7 +64,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         let vtable = self
             .get_ptr_alloc(
                 vtable,
-                pointer_size * u64::try_from(COMMON_VTABLE_ENTRIES.len()).unwrap(),
+                pointer_size * u64::try_from(TyCtxt::COMMON_VTABLE_ENTRIES.len()).unwrap(),
                 self.tcx.data_layout.pointer_align.abi,
             )?
             .expect("cannot be a ZST");
@@ -99,7 +99,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         let vtable = self
             .get_ptr_alloc(
                 vtable,
-                pointer_size * u64::try_from(COMMON_VTABLE_ENTRIES.len()).unwrap(),
+                pointer_size * u64::try_from(TyCtxt::COMMON_VTABLE_ENTRIES.len()).unwrap(),
                 self.tcx.data_layout.pointer_align.abi,
             )?
             .expect("cannot be a ZST");

compiler/rustc_lint/Cargo.toml

@@ -21,3 +21,4 @@ rustc_session = { path = "../rustc_session" }
 rustc_trait_selection = { path = "../rustc_trait_selection" }
 rustc_parse_format = { path = "../rustc_parse_format" }
 rustc_infer = { path = "../rustc_infer" }
+rustc_type_ir = { path = "../rustc_type_ir" }

compiler/rustc_lint/src/builtin.rs

@@ -2489,7 +2489,7 @@ impl<'tcx> LateLintPass<'tcx> for InvalidValue {
             ty: Ty<'tcx>,
             init: InitKind,
         ) -> Option<InitError> {
-            use rustc_middle::ty::TyKind::*;
+            use rustc_type_ir::sty::TyKind::*;
             match ty.kind() {
                 // Primitive types that don't like 0 as a value.
                 Ref(..) => Some(("references must be non-null".to_string(), None)),
@@ -2801,7 +2801,7 @@ impl ClashingExternDeclarations {
                 true
             } else {
                 // Do a full, depth-first comparison between the two.
-                use rustc_middle::ty::TyKind::*;
+                use rustc_type_ir::sty::TyKind::*;
                 let a_kind = a.kind();
                 let b_kind = b.kind();