Remove fold code and add Const::internal()

We are not planning to support user generated constant in the
foreseeable future, so we are removing the Fold logic for now in
favor of the Instance::resolve logic.

The Instance::resolve was however incomplete, since we weren't handling
internalizing constants yet. Thus, I added that.

I decided to keep the Const fields private in case we decide to
translate them lazily.

compiler/rustc_smir/src/lib.rs

@@ -13,6 +13,7 @@
 #![cfg_attr(not(bootstrap), doc(rust_logo))]
 #![cfg_attr(not(bootstrap), feature(rustdoc_internals))]
 #![cfg_attr(not(bootstrap), allow(internal_features))]
+#![allow(rustc::usage_of_ty_tykind)]
 
 pub mod rustc_internal;
 

compiler/rustc_smir/src/rustc_internal/internal.rs

@@ -4,7 +4,7 @@
 //! due to incomplete stable coverage.
 
 // Prefer importing stable_mir over internal rustc constructs to make this file more readable.
-use crate::rustc_smir::{MaybeStable, Tables};
+use crate::rustc_smir::Tables;
 use rustc_middle::ty::{self as rustc_ty, Ty as InternalTy};
 use stable_mir::ty::{Const, GenericArgKind, GenericArgs, Region, Ty};
 use stable_mir::DefId;
@@ -31,7 +31,7 @@ impl<'tcx> RustcInternal<'tcx> for GenericArgKind {
         match self {
             GenericArgKind::Lifetime(reg) => reg.internal(tables).into(),
             GenericArgKind::Type(ty) => ty.internal(tables).into(),
-            GenericArgKind::Const(cnst) => cnst.internal(tables).into(),
+            GenericArgKind::Const(cnst) => ty_const(cnst, tables).into(),
         }
     }
 }
@@ -46,16 +46,22 @@ impl<'tcx> RustcInternal<'tcx> for Region {
 impl<'tcx> RustcInternal<'tcx> for Ty {
     type T = InternalTy<'tcx>;
     fn internal(&self, tables: &mut Tables<'tcx>) -> Self::T {
-        match tables.types[self.0] {
-            MaybeStable::Stable(_) => todo!(),
-            MaybeStable::Rustc(ty) => ty,
+        tables.types[self.0]
+    }
+}
+
+fn ty_const<'tcx>(constant: &Const, tables: &mut Tables<'tcx>) -> rustc_ty::Const<'tcx> {
+    match constant.internal(tables) {
+        rustc_middle::mir::Const::Ty(c) => c,
+        cnst => {
+            panic!("Trying to covert constant `{constant:?}` to type constant, but found {cnst:?}")
         }
     }
 }
 
 impl<'tcx> RustcInternal<'tcx> for Const {
-    type T = rustc_ty::Const<'tcx>;
-    fn internal(&self, _tables: &mut Tables<'tcx>) -> Self::T {
-        todo!()
+    type T = rustc_middle::mir::Const<'tcx>;
+    fn internal(&self, tables: &mut Tables<'tcx>) -> Self::T {
+        tables.constants[self.id]
     }
 }

compiler/rustc_smir/src/rustc_internal/mod.rs

@@ -169,6 +169,7 @@ pub fn run(tcx: TyCtxt<'_>, f: impl FnOnce()) {
         spans: IndexMap::default(),
         types: vec![],
         instances: IndexMap::default(),
+        constants: IndexMap::default(),
     }));
     stable_mir::run(&tables, || init(&tables, f));
 }