Rollup merge of rust-lang#103798 - RalfJung:type_name, r=oli-obk

interpret: move type_name implementation to an interpreter-independent helper file

This should avoid pinging rust-lang/miri each time that file changes, which is really not necessary.

r? `@oli-obk`

Author: Yuki Okushi

compiler/rustc_const_eval/src/interpret/intrinsics.rs

@@ -7,7 +7,9 @@ use std::convert::TryFrom;
 use rustc_hir::def_id::DefId;
 use rustc_middle::mir::{
     self,
-    interpret::{ConstValue, GlobalId, InterpResult, PointerArithmetic, Scalar},
+    interpret::{
+        Allocation, ConstAllocation, ConstValue, GlobalId, InterpResult, PointerArithmetic, Scalar,
+    },
     BinOp, NonDivergingIntrinsic,
 };
 use rustc_middle::ty;
@@ -23,7 +25,6 @@ use super::{
 };
 
 mod caller_location;
-mod type_name;
 
 fn numeric_intrinsic<Prov>(name: Symbol, bits: u128, kind: Primitive) -> Scalar<Prov> {
     let size = match kind {
@@ -42,6 +43,13 @@ fn numeric_intrinsic<Prov>(name: Symbol, bits: u128, kind: Primitive) -> Scalar<
     Scalar::from_uint(bits_out, size)
 }
 
+/// Directly returns an `Allocation` containing an absolute path representation of the given type.
+pub(crate) fn alloc_type_name<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> ConstAllocation<'tcx> {
+    let path = crate::util::type_name(tcx, ty);
+    let alloc = Allocation::from_bytes_byte_aligned_immutable(path.into_bytes());
+    tcx.intern_const_alloc(alloc)
+}
+
 /// The logic for all nullary intrinsics is implemented here. These intrinsics don't get evaluated
 /// inside an `InterpCx` and instead have their value computed directly from rustc internal info.
 pub(crate) fn eval_nullary_intrinsic<'tcx>(
@@ -55,7 +63,7 @@ pub(crate) fn eval_nullary_intrinsic<'tcx>(
     Ok(match name {
         sym::type_name => {
             ensure_monomorphic_enough(tcx, tp_ty)?;
-            let alloc = type_name::alloc_type_name(tcx, tp_ty);
+            let alloc = alloc_type_name(tcx, tp_ty);
             ConstValue::Slice { data: alloc, start: 0, end: alloc.inner().len() }
         }
         sym::needs_drop => {

compiler/rustc_const_eval/src/util/mod.rs

@@ -4,9 +4,11 @@ mod call_kind;
 pub mod collect_writes;
 mod find_self_call;
 mod might_permit_raw_init;
+mod type_name;
 
 pub use self::aggregate::expand_aggregate;
 pub use self::alignment::is_disaligned;
 pub use self::call_kind::{call_kind, CallDesugaringKind, CallKind};
 pub use self::find_self_call::find_self_call;
 pub use self::might_permit_raw_init::might_permit_raw_init;
+pub use self::type_name::type_name;

compiler/rustc_const_eval/src/interpret/intrinsics/type_name.rs renamed to compiler/rustc_const_eval/src/util/type_name.rs

@@ -1,7 +1,6 @@
 use rustc_data_structures::intern::Interned;
 use rustc_hir::def_id::CrateNum;
 use rustc_hir::definitions::DisambiguatedDefPathData;
-use rustc_middle::mir::interpret::{Allocation, ConstAllocation};
 use rustc_middle::ty::{
     self,
     print::{PrettyPrinter, Print, Printer},
@@ -193,9 +192,6 @@ impl Write for AbsolutePathPrinter<'_> {
     }
 }
 
-/// Directly returns an `Allocation` containing an absolute path representation of the given type.
-pub(crate) fn alloc_type_name<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> ConstAllocation<'tcx> {
-    let path = AbsolutePathPrinter { tcx, path: String::new() }.print_type(ty).unwrap().path;
-    let alloc = Allocation::from_bytes_byte_aligned_immutable(path.into_bytes());
-    tcx.intern_const_alloc(alloc)
+pub fn type_name<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> String {
+    AbsolutePathPrinter { tcx, path: String::new() }.print_type(ty).unwrap().path
 }