Rollup merge of #133241 - RalfJung:typing-env, r=lcnr

interpret: make typing_env field private

This was made public in https://github.com/rust-lang/rust/pull/133212 but IMO it should remain private. (Specifically, this prevents it from being mutated.)

r? `@lcnr`

compiler/rustc_const_eval/src/const_eval/eval_queries.rs

@@ -7,7 +7,7 @@ use rustc_middle::bug;
 use rustc_middle::mir::interpret::{AllocId, ErrorHandled, InterpErrorInfo};
 use rustc_middle::mir::{self, ConstAlloc, ConstValue};
 use rustc_middle::query::TyCtxtAt;
-use rustc_middle::ty::layout::LayoutOf;
+use rustc_middle::ty::layout::{HasTypingEnv, LayoutOf};
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::def_id::LocalDefId;
@@ -30,7 +30,6 @@ fn eval_body_using_ecx<'tcx, R: InterpretationResult<'tcx>>(
     cid: GlobalId<'tcx>,
     body: &'tcx mir::Body<'tcx>,
 ) -> InterpResult<'tcx, R> {
-    trace!(?ecx.typing_env);
     let tcx = *ecx.tcx;
     assert!(
         cid.promoted.is_some()
@@ -220,7 +219,7 @@ pub(super) fn op_to_const<'tcx>(
                 let pointee_ty = imm.layout.ty.builtin_deref(false).unwrap(); // `false` = no raw ptrs
                 debug_assert!(
                     matches!(
-                        ecx.tcx.struct_tail_for_codegen(pointee_ty, ecx.typing_env).kind(),
+                        ecx.tcx.struct_tail_for_codegen(pointee_ty, ecx.typing_env()).kind(),
                         ty::Str | ty::Slice(..),
                     ),
                     "`ConstValue::Slice` is for slice-tailed types only, but got {}",

compiler/rustc_const_eval/src/const_eval/machine.rs

@@ -9,7 +9,7 @@ use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::{self as hir, CRATE_HIR_ID, LangItem};
 use rustc_middle::mir::AssertMessage;
 use rustc_middle::query::TyCtxtAt;
-use rustc_middle::ty::layout::TyAndLayout;
+use rustc_middle::ty::layout::{HasTypingEnv, TyAndLayout};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_middle::{bug, mir};
 use rustc_span::Span;
@@ -667,7 +667,7 @@ impl<'tcx> interpret::Machine<'tcx> for CompileTimeMachine<'tcx> {
                 .is_some_and(|p| !p.immutable())
         {
             // That next check is expensive, that's why we have all the guards above.
-            let is_immutable = ty.is_freeze(*ecx.tcx, ecx.typing_env);
+            let is_immutable = ty.is_freeze(*ecx.tcx, ecx.typing_env());
             let place = ecx.ref_to_mplace(val)?;
             let new_place = if is_immutable {
                 place.map_provenance(CtfeProvenance::as_immutable)

compiler/rustc_const_eval/src/interpret/eval_context.rs

@@ -39,8 +39,8 @@ pub struct InterpCx<'tcx, M: Machine<'tcx>> {
     pub tcx: TyCtxtAt<'tcx>,
 
     /// The current context in case we're evaluating in a
-    /// polymorphic context. This always uses `ty::TypingMode::PostAnalysis`
+    /// polymorphic context. This always uses `ty::TypingMode::PostAnalysis`.
-    pub typing_env: ty::TypingEnv<'tcx>,
+    pub(super) typing_env: ty::TypingEnv<'tcx>,
 
     /// The virtual memory system.
     pub memory: Memory<'tcx, M>,

compiler/rustc_mir_transform/src/gvn.rs

@@ -100,7 +100,7 @@ use rustc_middle::bug;
 use rustc_middle::mir::interpret::GlobalAlloc;
 use rustc_middle::mir::visit::*;
 use rustc_middle::mir::*;
-use rustc_middle::ty::layout::LayoutOf;
+use rustc_middle::ty::layout::{HasTypingEnv, LayoutOf};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::DUMMY_SP;
 use rustc_span::def_id::DefId;
@@ -294,7 +294,7 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
     }
 
     fn typing_env(&self) -> ty::TypingEnv<'tcx> {
-        self.ecx.typing_env
+        self.ecx.typing_env()
     }
 
     #[instrument(level = "trace", skip(self), ret)]

src/tools/miri/src/borrow_tracker/stacked_borrows/mod.rs

@@ -12,6 +12,7 @@ use std::{cmp, mem};
 use rustc_abi::{BackendRepr, Size};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_middle::mir::{Mutability, RetagKind};
+use rustc_middle::ty::layout::HasTypingEnv;
 use rustc_middle::ty::{self, Ty};
 
 use self::diagnostics::{RetagCause, RetagInfo};
@@ -70,7 +71,7 @@ impl NewPermission {
                         access: None,
                         protector: None,
                     }
-                } else if pointee.is_unpin(*cx.tcx, cx.typing_env) {
+                } else if pointee.is_unpin(*cx.tcx, cx.typing_env()) {
                     // A regular full mutable reference. On `FnEntry` this is `noalias` and `dereferenceable`.
                     NewPermission::Uniform {
                         perm: Permission::Unique,
@@ -128,7 +129,7 @@ impl NewPermission {
     fn from_box_ty<'tcx>(ty: Ty<'tcx>, kind: RetagKind, cx: &crate::MiriInterpCx<'tcx>) -> Self {
         // `ty` is not the `Box` but the field of the Box with this pointer (due to allocator handling).
         let pointee = ty.builtin_deref(true).unwrap();
-        if pointee.is_unpin(*cx.tcx, cx.typing_env) {
+        if pointee.is_unpin(*cx.tcx, cx.typing_env()) {
             // A regular box. On `FnEntry` this is `noalias`, but not `dereferenceable` (hence only
             // a weak protector).
             NewPermission::Uniform {
@@ -607,7 +608,7 @@ trait EvalContextPrivExt<'tcx, 'ecx>: crate::MiriInterpCxExt<'tcx> {
                 match new_perm {
                     NewPermission::Uniform { perm, .. } =>
                         write!(kind_str, "{perm:?} permission").unwrap(),
-                    NewPermission::FreezeSensitive { freeze_perm, .. } if ty.is_freeze(*this.tcx, this.typing_env) =>
+                    NewPermission::FreezeSensitive { freeze_perm, .. } if ty.is_freeze(*this.tcx, this.typing_env()) =>
                         write!(kind_str, "{freeze_perm:?} permission").unwrap(),
                     NewPermission::FreezeSensitive { freeze_perm, nonfreeze_perm, .. }  =>
                         write!(kind_str, "{freeze_perm:?}/{nonfreeze_perm:?} permission for frozen/non-frozen parts").unwrap(),

src/tools/miri/src/borrow_tracker/tree_borrows/mod.rs

@@ -1,5 +1,6 @@
 use rustc_abi::{BackendRepr, Size};
 use rustc_middle::mir::{Mutability, RetagKind};
+use rustc_middle::ty::layout::HasTypingEnv;
 use rustc_middle::ty::{self, Ty};
 use rustc_span::def_id::DefId;
 
@@ -131,8 +132,8 @@ impl<'tcx> NewPermission {
         kind: RetagKind,
         cx: &crate::MiriInterpCx<'tcx>,
     ) -> Option<Self> {
-        let ty_is_freeze = pointee.is_freeze(*cx.tcx, cx.typing_env);
+        let ty_is_freeze = pointee.is_freeze(*cx.tcx, cx.typing_env());
-        let ty_is_unpin = pointee.is_unpin(*cx.tcx, cx.typing_env);
+        let ty_is_unpin = pointee.is_unpin(*cx.tcx, cx.typing_env());
         let is_protected = kind == RetagKind::FnEntry;
         // As demonstrated by `tests/fail/tree_borrows/reservedim_spurious_write.rs`,
         // interior mutability and protectors interact poorly.
@@ -163,10 +164,10 @@ impl<'tcx> NewPermission {
         zero_size: bool,
     ) -> Option<Self> {
         let pointee = ty.builtin_deref(true).unwrap();
-        pointee.is_unpin(*cx.tcx, cx.typing_env).then_some(()).map(|()| {
+        pointee.is_unpin(*cx.tcx, cx.typing_env()).then_some(()).map(|()| {
             // Regular `Unpin` box, give it `noalias` but only a weak protector
             // because it is valid to deallocate it within the function.
-            let ty_is_freeze = ty.is_freeze(*cx.tcx, cx.typing_env);
+            let ty_is_freeze = ty.is_freeze(*cx.tcx, cx.typing_env());
             let protected = kind == RetagKind::FnEntry;
             let initial_state = Permission::new_reserved(ty_is_freeze, protected);
             Self {
@@ -520,7 +521,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         // Note: if we were to inline `new_reserved` below we would find out that
         // `ty_is_freeze` is eventually unused because it appears in a `ty_is_freeze || true`.
         // We are nevertheless including it here for clarity.
-        let ty_is_freeze = place.layout.ty.is_freeze(*this.tcx, this.typing_env);
+        let ty_is_freeze = place.layout.ty.is_freeze(*this.tcx, this.typing_env());
         // Retag it. With protection! That is the entire point.
         let new_perm = NewPermission {
             initial_state: Permission::new_reserved(ty_is_freeze, /* protected */ true),

src/tools/miri/src/machine.rs

@@ -17,7 +17,9 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::static_assert_size;
 use rustc_middle::mir;
 use rustc_middle::query::TyCtxtAt;
-use rustc_middle::ty::layout::{HasTyCtxt, LayoutCx, LayoutError, LayoutOf, TyAndLayout};
+use rustc_middle::ty::layout::{
+    HasTyCtxt, HasTypingEnv, LayoutCx, LayoutError, LayoutOf, TyAndLayout,
+};
 use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
 use rustc_session::config::InliningThreshold;
 use rustc_span::def_id::{CrateNum, DefId};
@@ -1127,9 +1129,8 @@ impl<'tcx> Machine<'tcx> for MiriMachine<'tcx> {
             };
             let info = ecx.get_alloc_info(alloc_id);
             let def_ty = ecx.tcx.type_of(def_id).instantiate_identity();
-            let extern_decl_layout = ecx.tcx.layout_of(
+            let extern_decl_layout =
-                ecx.typing_env.as_query_input(def_ty)
+                ecx.tcx.layout_of(ecx.typing_env().as_query_input(def_ty)).unwrap();
-            ).unwrap();
             if extern_decl_layout.size != info.size || extern_decl_layout.align.abi != info.align {
                 throw_unsup_format!(
                     "extern static `{link_name}` has been declared as `{krate}::{name}` \