Implement SmirInterface

- With `Context` wrapped by `SmirInterface`, the stable-mir's TLV stores a pointer to `SmirInterface`, while the rustc-specific TLV stores a pointer to tables.
 - This PR make the `rustc_smir` mod public.

compiler/rustc_smir/src/stable_mir/compiler_interface.rs

@@ -5,6 +5,7 @@
 
 use std::cell::Cell;
 
+use rustc_smir::context::Context;
 use stable_mir::abi::{FnAbi, Layout, LayoutShape};
 use stable_mir::crate_def::Attribute;
 use stable_mir::mir::alloc::{AllocId, GlobalAlloc};
@@ -22,47 +23,116 @@ use stable_mir::{
     ItemKind, Symbol, TraitDecls, mir,
 };
 
-use crate::stable_mir;
+use crate::{rustc_smir, stable_mir};
+
+/// Stable public API for querying compiler information.
+///
+/// All queries are delegated to an internal [`Context`] that provides
+/// similar APIs but based on internal rustc constructs.
+///
+/// Do not use this directly. This is currently used in the macro expansion.
+pub struct SmirInterface<'tcx> {
+    pub(crate) cx: Context<'tcx>,
+}
+
+impl<'tcx> SmirInterface<'tcx> {
+    pub fn entry_fn(&self) -> Option<CrateItem> {
+        self.cx.entry_fn()
+    }
 
-/// This trait defines the interface between stable_mir and the Rust compiler.
-/// Do not use this directly.
-pub trait Context {
-    fn entry_fn(&self) -> Option<CrateItem>;
     /// Retrieve all items of the local crate that have a MIR associated with them.
-    fn all_local_items(&self) -> CrateItems;
+    pub fn all_local_items(&self) -> CrateItems {
+        self.cx.all_local_items()
+    }
+
     /// Retrieve the body of a function.
     /// This function will panic if the body is not available.
-    fn mir_body(&self, item: DefId) -> mir::Body;
+    pub fn mir_body(&self, item: DefId) -> mir::Body {
+        self.cx.mir_body(item)
+    }
+
     /// Check whether the body of a function is available.
-    fn has_body(&self, item: DefId) -> bool;
-    fn foreign_modules(&self, crate_num: CrateNum) -> Vec<ForeignModuleDef>;
+    pub fn has_body(&self, item: DefId) -> bool {
+        self.cx.has_body(item)
+    }
+
+    pub fn foreign_modules(&self, crate_num: CrateNum) -> Vec<ForeignModuleDef> {
+        self.cx.foreign_modules(crate_num)
+    }
 
     /// Retrieve all functions defined in this crate.
-    fn crate_functions(&self, crate_num: CrateNum) -> Vec<FnDef>;
+    pub fn crate_functions(&self, crate_num: CrateNum) -> Vec<FnDef> {
+        self.cx.crate_functions(crate_num)
+    }
 
     /// Retrieve all static items defined in this crate.
-    fn crate_statics(&self, crate_num: CrateNum) -> Vec<StaticDef>;
-    fn foreign_module(&self, mod_def: ForeignModuleDef) -> ForeignModule;
-    fn foreign_items(&self, mod_def: ForeignModuleDef) -> Vec<ForeignDef>;
-    fn all_trait_decls(&self) -> TraitDecls;
-    fn trait_decls(&self, crate_num: CrateNum) -> TraitDecls;
-    fn trait_decl(&self, trait_def: &TraitDef) -> TraitDecl;
-    fn all_trait_impls(&self) -> ImplTraitDecls;
-    fn trait_impls(&self, crate_num: CrateNum) -> ImplTraitDecls;
-    fn trait_impl(&self, trait_impl: &ImplDef) -> ImplTrait;
-    fn generics_of(&self, def_id: DefId) -> Generics;
-    fn predicates_of(&self, def_id: DefId) -> GenericPredicates;
-    fn explicit_predicates_of(&self, def_id: DefId) -> GenericPredicates;
+    pub fn crate_statics(&self, crate_num: CrateNum) -> Vec<StaticDef> {
+        self.cx.crate_statics(crate_num)
+    }
+
+    pub fn foreign_module(&self, mod_def: ForeignModuleDef) -> ForeignModule {
+        self.cx.foreign_module(mod_def)
+    }
+
+    pub fn foreign_items(&self, mod_def: ForeignModuleDef) -> Vec<ForeignDef> {
+        self.cx.foreign_items(mod_def)
+    }
+
+    pub fn all_trait_decls(&self) -> TraitDecls {
+        self.cx.all_trait_decls()
+    }
+
+    pub fn trait_decls(&self, crate_num: CrateNum) -> TraitDecls {
+        self.cx.trait_decls(crate_num)
+    }
+
+    pub fn trait_decl(&self, trait_def: &TraitDef) -> TraitDecl {
+        self.cx.trait_decl(trait_def)
+    }
+
+    pub fn all_trait_impls(&self) -> ImplTraitDecls {
+        self.cx.all_trait_impls()
+    }
+
+    pub fn trait_impls(&self, crate_num: CrateNum) -> ImplTraitDecls {
+        self.cx.trait_impls(crate_num)
+    }
+
+    pub fn trait_impl(&self, trait_impl: &ImplDef) -> ImplTrait {
+        self.cx.trait_impl(trait_impl)
+    }
+
+    pub fn generics_of(&self, def_id: DefId) -> Generics {
+        self.cx.generics_of(def_id)
+    }
+
+    pub fn predicates_of(&self, def_id: DefId) -> GenericPredicates {
+        self.cx.predicates_of(def_id)
+    }
+
+    pub fn explicit_predicates_of(&self, def_id: DefId) -> GenericPredicates {
+        self.cx.explicit_predicates_of(def_id)
+    }
+
     /// Get information about the local crate.
-    fn local_crate(&self) -> Crate;
+    pub fn local_crate(&self) -> Crate {
+        self.cx.local_crate()
+    }
+
     /// Retrieve a list of all external crates.
-    fn external_crates(&self) -> Vec<Crate>;
+    pub fn external_crates(&self) -> Vec<Crate> {
+        self.cx.external_crates()
+    }
 
     /// Find a crate with the given name.
-    fn find_crates(&self, name: &str) -> Vec<Crate>;
+    pub fn find_crates(&self, name: &str) -> Vec<Crate> {
+        self.cx.find_crates(name)
+    }
 
-    /// Returns the name of given `DefId`
-    fn def_name(&self, def_id: DefId, trimmed: bool) -> Symbol;
+    /// Returns the name of given `DefId`.
+    pub fn def_name(&self, def_id: DefId, trimmed: bool) -> Symbol {
+        self.cx.def_name(def_id, trimmed)
+    }
 
     /// Return registered tool attributes with the given attribute name.
     ///
@@ -71,218 +141,350 @@ pub trait Context {
     ///
     /// Single segmented name like `#[clippy]` is specified as `&["clippy".to_string()]`.
     /// Multi-segmented name like `#[rustfmt::skip]` is specified as `&["rustfmt".to_string(), "skip".to_string()]`.
-    fn tool_attrs(&self, def_id: DefId, attr: &[Symbol]) -> Vec<Attribute>;
+    pub fn tool_attrs(&self, def_id: DefId, attr: &[Symbol]) -> Vec<Attribute> {
+        self.cx.tool_attrs(def_id, attr)
+    }
 
     /// Get all tool attributes of a definition.
-    fn all_tool_attrs(&self, def_id: DefId) -> Vec<Attribute>;
+    pub fn all_tool_attrs(&self, def_id: DefId) -> Vec<Attribute> {
+        self.cx.all_tool_attrs(def_id)
+    }
 
-    /// Returns printable, human readable form of `Span`
-    fn span_to_string(&self, span: Span) -> String;
+    /// Returns printable, human readable form of `Span`.
+    pub fn span_to_string(&self, span: Span) -> String {
+        self.cx.span_to_string(span)
+    }
 
-    /// Return filename from given `Span`, for diagnostic purposes
-    fn get_filename(&self, span: &Span) -> Filename;
+    /// Return filename from given `Span`, for diagnostic purposes.
+    pub fn get_filename(&self, span: &Span) -> Filename {
+        self.cx.get_filename(span)
+    }
 
-    /// Return lines corresponding to this `Span`
-    fn get_lines(&self, span: &Span) -> LineInfo;
+    /// Return lines corresponding to this `Span`.
+    pub fn get_lines(&self, span: &Span) -> LineInfo {
+        self.cx.get_lines(span)
+    }
 
-    /// Returns the `kind` of given `DefId`
-    fn item_kind(&self, item: CrateItem) -> ItemKind;
+    /// Returns the `kind` of given `DefId`.
+    pub fn item_kind(&self, item: CrateItem) -> ItemKind {
+        self.cx.item_kind(item)
+    }
 
     /// Returns whether this is a foreign item.
-    fn is_foreign_item(&self, item: DefId) -> bool;
+    pub fn is_foreign_item(&self, item: DefId) -> bool {
+        self.cx.is_foreign_item(item)
+    }
 
     /// Returns the kind of a given foreign item.
-    fn foreign_item_kind(&self, def: ForeignDef) -> ForeignItemKind;
+    pub fn foreign_item_kind(&self, def: ForeignDef) -> ForeignItemKind {
+        self.cx.foreign_item_kind(def)
+    }
 
-    /// Returns the kind of a given algebraic data type
-    fn adt_kind(&self, def: AdtDef) -> AdtKind;
+    /// Returns the kind of a given algebraic data type.
+    pub fn adt_kind(&self, def: AdtDef) -> AdtKind {
+        self.cx.adt_kind(def)
+    }
 
     /// Returns if the ADT is a box.
-    fn adt_is_box(&self, def: AdtDef) -> bool;
+    pub fn adt_is_box(&self, def: AdtDef) -> bool {
+        self.cx.adt_is_box(def)
+    }
 
     /// Returns whether this ADT is simd.
-    fn adt_is_simd(&self, def: AdtDef) -> bool;
+    pub fn adt_is_simd(&self, def: AdtDef) -> bool {
+        self.cx.adt_is_simd(def)
+    }
 
     /// Returns whether this definition is a C string.
-    fn adt_is_cstr(&self, def: AdtDef) -> bool;
+    pub fn adt_is_cstr(&self, def: AdtDef) -> bool {
+        self.cx.adt_is_cstr(def)
+    }
 
     /// Retrieve the function signature for the given generic arguments.
-    fn fn_sig(&self, def: FnDef, args: &GenericArgs) -> PolyFnSig;
+    pub fn fn_sig(&self, def: FnDef, args: &GenericArgs) -> PolyFnSig {
+        self.cx.fn_sig(def, args)
+    }
 
     /// Retrieve the intrinsic definition if the item corresponds one.
-    fn intrinsic(&self, item: DefId) -> Option<IntrinsicDef>;
+    pub fn intrinsic(&self, item: DefId) -> Option<IntrinsicDef> {
+        self.cx.intrinsic(item)
+    }
 
     /// Retrieve the plain function name of an intrinsic.
-    fn intrinsic_name(&self, def: IntrinsicDef) -> Symbol;
+    pub fn intrinsic_name(&self, def: IntrinsicDef) -> Symbol {
+        self.cx.intrinsic_name(def)
+    }
 
     /// Retrieve the closure signature for the given generic arguments.
-    fn closure_sig(&self, args: &GenericArgs) -> PolyFnSig;
+    pub fn closure_sig(&self, args: &GenericArgs) -> PolyFnSig {
+        self.cx.closure_sig(args)
+    }
 
     /// The number of variants in this ADT.
-    fn adt_variants_len(&self, def: AdtDef) -> usize;
+    pub fn adt_variants_len(&self, def: AdtDef) -> usize {
+        self.cx.adt_variants_len(def)
+    }
 
     /// The name of a variant.
-    fn variant_name(&self, def: VariantDef) -> Symbol;
-    fn variant_fields(&self, def: VariantDef) -> Vec<FieldDef>;
+    pub fn variant_name(&self, def: VariantDef) -> Symbol {
+        self.cx.variant_name(def)
+    }
+
+    pub fn variant_fields(&self, def: VariantDef) -> Vec<FieldDef> {
+        self.cx.variant_fields(def)
+    }
 
     /// Evaluate constant as a target usize.
-    fn eval_target_usize(&self, cnst: &MirConst) -> Result<u64, Error>;
-    fn eval_target_usize_ty(&self, cnst: &TyConst) -> Result<u64, Error>;
+    pub fn eval_target_usize(&self, cnst: &MirConst) -> Result<u64, Error> {
+        self.cx.eval_target_usize(cnst)
+    }
+
+    pub fn eval_target_usize_ty(&self, cnst: &TyConst) -> Result<u64, Error> {
+        self.cx.eval_target_usize_ty(cnst)
+    }
 
     /// Create a new zero-sized constant.
-    fn try_new_const_zst(&self, ty: Ty) -> Result<MirConst, Error>;
+    pub fn try_new_const_zst(&self, ty: Ty) -> Result<MirConst, Error> {
+        self.cx.try_new_const_zst(ty)
+    }
 
     /// Create a new constant that represents the given string value.
-    fn new_const_str(&self, value: &str) -> MirConst;
+    pub fn new_const_str(&self, value: &str) -> MirConst {
+        self.cx.new_const_str(value)
+    }
 
     /// Create a new constant that represents the given boolean value.
-    fn new_const_bool(&self, value: bool) -> MirConst;
+    pub fn new_const_bool(&self, value: bool) -> MirConst {
+        self.cx.new_const_bool(value)
+    }
 
     /// Create a new constant that represents the given value.
-    fn try_new_const_uint(&self, value: u128, uint_ty: UintTy) -> Result<MirConst, Error>;
-    fn try_new_ty_const_uint(&self, value: u128, uint_ty: UintTy) -> Result<TyConst, Error>;
+    pub fn try_new_const_uint(&self, value: u128, uint_ty: UintTy) -> Result<MirConst, Error> {
+        self.cx.try_new_const_uint(value, uint_ty)
+    }
+
+    pub fn try_new_ty_const_uint(&self, value: u128, uint_ty: UintTy) -> Result<TyConst, Error> {
+        self.cx.try_new_ty_const_uint(value, uint_ty)
+    }
 
     /// Create a new type from the given kind.
-    fn new_rigid_ty(&self, kind: RigidTy) -> Ty;
+    pub fn new_rigid_ty(&self, kind: RigidTy) -> Ty {
+        self.cx.new_rigid_ty(kind)
+    }
 
     /// Create a new box type, `Box<T>`, for the given inner type `T`.
-    fn new_box_ty(&self, ty: Ty) -> Ty;
+    pub fn new_box_ty(&self, ty: Ty) -> Ty {
+        self.cx.new_box_ty(ty)
+    }
 
     /// Returns the type of given crate item.
-    fn def_ty(&self, item: DefId) -> Ty;
+    pub fn def_ty(&self, item: DefId) -> Ty {
+        self.cx.def_ty(item)
+    }
 
     /// Returns the type of given definition instantiated with the given arguments.
-    fn def_ty_with_args(&self, item: DefId, args: &GenericArgs) -> Ty;
+    pub fn def_ty_with_args(&self, item: DefId, args: &GenericArgs) -> Ty {
+        self.cx.def_ty_with_args(item, args)
+    }
 
     /// Returns literal value of a const as a string.
-    fn mir_const_pretty(&self, cnst: &MirConst) -> String;
+    pub fn mir_const_pretty(&self, cnst: &MirConst) -> String {
+        self.cx.mir_const_pretty(cnst)
+    }
 
-    /// `Span` of an item
-    fn span_of_an_item(&self, def_id: DefId) -> Span;
+    /// `Span` of an item.
+    pub fn span_of_an_item(&self, def_id: DefId) -> Span {
+        self.cx.span_of_an_item(def_id)
+    }
 
-    fn ty_const_pretty(&self, ct: TyConstId) -> String;
+    pub fn ty_const_pretty(&self, ct: TyConstId) -> String {
+        self.cx.ty_const_pretty(ct)
+    }
 
     /// Obtain the representation of a type.
-    fn ty_pretty(&self, ty: Ty) -> String;
+    pub fn ty_pretty(&self, ty: Ty) -> String {
+        self.cx.ty_pretty(ty)
+    }
 
     /// Obtain the representation of a type.
-    fn ty_kind(&self, ty: Ty) -> TyKind;
+    pub fn ty_kind(&self, ty: Ty) -> TyKind {
+        self.cx.ty_kind(ty)
+    }
 
-    // Get the discriminant Ty for this Ty if there's one.
-    fn rigid_ty_discriminant_ty(&self, ty: &RigidTy) -> Ty;
+    /// Get the discriminant Ty for this Ty if there's one.
+    pub fn rigid_ty_discriminant_ty(&self, ty: &RigidTy) -> Ty {
+        self.cx.rigid_ty_discriminant_ty(ty)
+    }
 
     /// Get the body of an Instance which is already monomorphized.
-    fn instance_body(&self, instance: InstanceDef) -> Option<Body>;
+    pub fn instance_body(&self, instance: InstanceDef) -> Option<Body> {
+        self.cx.instance_body(instance)
+    }
 
     /// Get the instance type with generic instantiations applied and lifetimes erased.
-    fn instance_ty(&self, instance: InstanceDef) -> Ty;
+    pub fn instance_ty(&self, instance: InstanceDef) -> Ty {
+        self.cx.instance_ty(instance)
+    }
 
     /// Get the instantiation types.
-    fn instance_args(&self, def: InstanceDef) -> GenericArgs;
+    pub fn instance_args(&self, def: InstanceDef) -> GenericArgs {
+        self.cx.instance_args(def)
+    }
 
     /// Get the instance.
-    fn instance_def_id(&self, instance: InstanceDef) -> DefId;
+    pub fn instance_def_id(&self, instance: InstanceDef) -> DefId {
+        self.cx.instance_def_id(instance)
+    }
 
     /// Get the instance mangled name.
-    fn instance_mangled_name(&self, instance: InstanceDef) -> Symbol;
+    pub fn instance_mangled_name(&self, instance: InstanceDef) -> Symbol {
+        self.cx.instance_mangled_name(instance)
+    }
 
     /// Check if this is an empty DropGlue shim.
-    fn is_empty_drop_shim(&self, def: InstanceDef) -> bool;
+    pub fn is_empty_drop_shim(&self, def: InstanceDef) -> bool {
+        self.cx.is_empty_drop_shim(def)
+    }
 
     /// Check if this is an empty AsyncDropGlueCtor shim.
-    fn is_empty_async_drop_ctor_shim(&self, def: InstanceDef) -> bool;
+    pub fn is_empty_async_drop_ctor_shim(&self, def: InstanceDef) -> bool {
+        self.cx.is_empty_async_drop_ctor_shim(def)
+    }
 
     /// Convert a non-generic crate item into an instance.
     /// This function will panic if the item is generic.
-    fn mono_instance(&self, def_id: DefId) -> Instance;
+    pub fn mono_instance(&self, def_id: DefId) -> Instance {
+        self.cx.mono_instance(def_id)
+    }
 
     /// Item requires monomorphization.
-    fn requires_monomorphization(&self, def_id: DefId) -> bool;
+    pub fn requires_monomorphization(&self, def_id: DefId) -> bool {
+        self.cx.requires_monomorphization(def_id)
+    }
 
     /// Resolve an instance from the given function definition and generic arguments.
-    fn resolve_instance(&self, def: FnDef, args: &GenericArgs) -> Option<Instance>;
+    pub fn resolve_instance(&self, def: FnDef, args: &GenericArgs) -> Option<Instance> {
+        self.cx.resolve_instance(def, args)
+    }
 
     /// Resolve an instance for drop_in_place for the given type.
-    fn resolve_drop_in_place(&self, ty: Ty) -> Instance;
+    pub fn resolve_drop_in_place(&self, ty: Ty) -> Instance {
+        self.cx.resolve_drop_in_place(ty)
+    }
 
     /// Resolve instance for a function pointer.
-    fn resolve_for_fn_ptr(&self, def: FnDef, args: &GenericArgs) -> Option<Instance>;
+    pub fn resolve_for_fn_ptr(&self, def: FnDef, args: &GenericArgs) -> Option<Instance> {
+        self.cx.resolve_for_fn_ptr(def, args)
+    }
 
     /// Resolve instance for a closure with the requested type.
-    fn resolve_closure(
+    pub fn resolve_closure(
         &self,
         def: ClosureDef,
         args: &GenericArgs,
         kind: ClosureKind,
-    ) -> Option<Instance>;
+    ) -> Option<Instance> {
+        self.cx.resolve_closure(def, args, kind)
+    }
 
     /// Evaluate a static's initializer.
-    fn eval_static_initializer(&self, def: StaticDef) -> Result<Allocation, Error>;
+    pub fn eval_static_initializer(&self, def: StaticDef) -> Result<Allocation, Error> {
+        self.cx.eval_static_initializer(def)
+    }
 
     /// Try to evaluate an instance into a constant.
-    fn eval_instance(&self, def: InstanceDef, const_ty: Ty) -> Result<Allocation, Error>;
+    pub fn eval_instance(&self, def: InstanceDef, const_ty: Ty) -> Result<Allocation, Error> {
+        self.cx.eval_instance(def, const_ty)
+    }
 
     /// Retrieve global allocation for the given allocation ID.
-    fn global_alloc(&self, id: AllocId) -> GlobalAlloc;
+    pub fn global_alloc(&self, id: AllocId) -> GlobalAlloc {
+        self.cx.global_alloc(id)
+    }
 
     /// Retrieve the id for the virtual table.
-    fn vtable_allocation(&self, global_alloc: &GlobalAlloc) -> Option<AllocId>;
-    fn krate(&self, def_id: DefId) -> Crate;
-    fn instance_name(&self, def: InstanceDef, trimmed: bool) -> Symbol;
+    pub fn vtable_allocation(&self, global_alloc: &GlobalAlloc) -> Option<AllocId> {
+        self.cx.vtable_allocation(global_alloc)
+    }
+
+    pub fn krate(&self, def_id: DefId) -> Crate {
+        self.cx.krate(def_id)
+    }
+
+    pub fn instance_name(&self, def: InstanceDef, trimmed: bool) -> Symbol {
+        self.cx.instance_name(def, trimmed)
+    }
 
     /// Return information about the target machine.
-    fn target_info(&self) -> MachineInfo;
+    pub fn target_info(&self) -> MachineInfo {
+        self.cx.target_info()
+    }
 
     /// Get an instance ABI.
-    fn instance_abi(&self, def: InstanceDef) -> Result<FnAbi, Error>;
+    pub fn instance_abi(&self, def: InstanceDef) -> Result<FnAbi, Error> {
+        self.cx.instance_abi(def)
+    }
 
     /// Get the ABI of a function pointer.
-    fn fn_ptr_abi(&self, fn_ptr: PolyFnSig) -> Result<FnAbi, Error>;
+    pub fn fn_ptr_abi(&self, fn_ptr: PolyFnSig) -> Result<FnAbi, Error> {
+        self.cx.fn_ptr_abi(fn_ptr)
+    }
 
     /// Get the layout of a type.
-    fn ty_layout(&self, ty: Ty) -> Result<Layout, Error>;
+    pub fn ty_layout(&self, ty: Ty) -> Result<Layout, Error> {
+        self.cx.ty_layout(ty)
+    }
 
     /// Get the layout shape.
-    fn layout_shape(&self, id: Layout) -> LayoutShape;
+    pub fn layout_shape(&self, id: Layout) -> LayoutShape {
+        self.cx.layout_shape(id)
+    }
 
     /// Get a debug string representation of a place.
-    fn place_pretty(&self, place: &Place) -> String;
+    pub fn place_pretty(&self, place: &Place) -> String {
+        self.cx.place_pretty(place)
+    }
 
     /// Get the resulting type of binary operation.
-    fn binop_ty(&self, bin_op: BinOp, rhs: Ty, lhs: Ty) -> Ty;
+    pub fn binop_ty(&self, bin_op: BinOp, rhs: Ty, lhs: Ty) -> Ty {
+        self.cx.binop_ty(bin_op, rhs, lhs)
+    }
 
     /// Get the resulting type of unary operation.
-    fn unop_ty(&self, un_op: UnOp, arg: Ty) -> Ty;
+    pub fn unop_ty(&self, un_op: UnOp, arg: Ty) -> Ty {
+        self.cx.unop_ty(un_op, arg)
+    }
 
     /// Get all associated items of a definition.
-    fn associated_items(&self, def_id: DefId) -> AssocItems;
+    pub fn associated_items(&self, def_id: DefId) -> AssocItems {
+        self.cx.associated_items(def_id)
+    }
 }
 
-// A thread local variable that stores a pointer to the tables mapping between TyCtxt
-// datastructures and stable MIR datastructures
+// A thread local variable that stores a pointer to [`SmirInterface`].
 scoped_tls::scoped_thread_local!(static TLV: Cell<*const ()>);
 
-pub fn run<F, T>(context: &dyn Context, f: F) -> Result<T, Error>
+pub fn run<'tcx, T, F>(interface: &SmirInterface<'tcx>, f: F) -> Result<T, Error>
 where
     F: FnOnce() -> T,
 {
     if TLV.is_set() {
         Err(Error::from("StableMIR already running"))
     } else {
-        let ptr: *const () = (&raw const context) as _;
+        let ptr: *const () = (interface as *const SmirInterface<'tcx>) as *const ();
         TLV.set(&Cell::new(ptr), || Ok(f()))
     }
 }
 
-/// Execute the given function with access the compiler [Context].
+/// Execute the given function with access the [`SmirInterface`].
 ///
-/// I.e., This function will load the current context and calls a function with it.
+/// I.e., This function will load the current interface and calls a function with it.
 /// Do not nest these, as that will ICE.
-pub(crate) fn with<R>(f: impl FnOnce(&dyn Context) -> R) -> R {
+pub(crate) fn with<R>(f: impl FnOnce(&SmirInterface<'_>) -> R) -> R {
     assert!(TLV.is_set());
     TLV.with(|tlv| {
         let ptr = tlv.get();
         assert!(!ptr.is_null());
-        f(unsafe { *(ptr as *const &dyn Context) })
+        f(unsafe { &*(ptr as *const SmirInterface<'_>) })
     })
 }