Address review comments

compiler/rustc_middle/src/mir/interpret/error.rs

@@ -1,4 +1,4 @@
-use super::{AllocId, Pointer, RawConst, Scalar};
+use super::{AllocId, ConstAlloc, Pointer, Scalar};
 
 use crate::mir::interpret::ConstValue;
 use crate::ty::{layout, query::TyCtxtAt, tls, FnSig, Ty};
@@ -27,7 +27,7 @@ CloneTypeFoldableAndLiftImpls! {
     ErrorHandled,
 }
 
-pub type EvalToAllocationRawResult<'tcx> = Result<RawConst<'tcx>, ErrorHandled>;
+pub type EvalToAllocationRawResult<'tcx> = Result<ConstAlloc<'tcx>, ErrorHandled>;
 pub type EvalToConstValueResult<'tcx> = Result<ConstValue<'tcx>, ErrorHandled>;
 
 pub fn struct_error<'tcx>(tcx: TyCtxtAt<'tcx>, msg: &str) -> DiagnosticBuilder<'tcx> {

compiler/rustc_middle/src/mir/interpret/mod.rs

@@ -123,7 +123,7 @@ pub use self::error::{
     ResourceExhaustionInfo, UndefinedBehaviorInfo, UninitBytesAccess, UnsupportedOpInfo,
 };
 
-pub use self::value::{get_slice_bytes, ConstValue, RawConst, Scalar, ScalarMaybeUninit};
+pub use self::value::{get_slice_bytes, ConstAlloc, ConstValue, Scalar, ScalarMaybeUninit};
 
 pub use self::allocation::{Allocation, AllocationExtra, InitMask, Relocations};
 

compiler/rustc_middle/src/mir/interpret/value.rs

@@ -14,7 +14,7 @@ use super::{sign_extend, truncate, AllocId, Allocation, InterpResult, Pointer, P
 
 /// Represents the result of const evaluation via the `eval_to_allocation` query.
 #[derive(Clone, HashStable)]
-pub struct RawConst<'tcx> {
+pub struct ConstAlloc<'tcx> {
     // the value lives here, at offset 0, and that allocation definitely is a `AllocKind::Memory`
     // (so you can use `AllocMap::unwrap_memory`).
     pub alloc_id: AllocId,

compiler/rustc_middle/src/query/mod.rs

@@ -713,7 +713,7 @@ rustc_queries! {
         query eval_to_allocation_raw(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
             -> EvalToAllocationRawResult<'tcx> {
             desc { |tcx|
-                "const-evaluating `{}`",
+                "const-evaluating + checking `{}`",
                 key.value.display(tcx)
             }
         }
@@ -727,7 +727,7 @@ rustc_queries! {
         query eval_to_const_value(key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>)
             -> EvalToConstValueResult<'tcx> {
             desc { |tcx|
-                "const-evaluating + checking `{}`",
+                "simplifying constant for the type system `{}`",
                 key.value.display(tcx)
             }
             cache_on_disk_if(_, opt_result) {

compiler/rustc_mir/src/const_eval/eval_queries.rs

@@ -2,7 +2,7 @@ use super::{CompileTimeEvalContext, CompileTimeInterpreter, ConstEvalErr, Memory
 use crate::interpret::eval_nullary_intrinsic;
 use crate::interpret::{
     intern_const_alloc_recursive, Allocation, ConstValue, GlobalId, Immediate, InternKind,
-    InterpCx, InterpResult, MPlaceTy, MemoryKind, OpTy, RawConst, RefTracking, Scalar,
+    InterpCx, InterpResult, MPlaceTy, MemoryKind, OpTy, ConstAlloc, RefTracking, Scalar,
     ScalarMaybeUninit, StackPopCleanup,
 };
 
@@ -184,9 +184,9 @@ pub(super) fn op_to_const<'tcx>(
     }
 }
 
-fn turn_into_const<'tcx>(
+fn turn_into_const_value<'tcx>(
     tcx: TyCtxt<'tcx>,
-    constant: RawConst<'tcx>,
+    constant: ConstAlloc<'tcx>,
     key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>,
 ) -> ConstValue<'tcx> {
     let cid = key.value;
@@ -237,7 +237,7 @@ pub fn eval_to_const_value_provider<'tcx>(
         });
     }
 
-    tcx.eval_to_allocation_raw(key).map(|val| turn_into_const(tcx, val, key))
+    tcx.eval_to_allocation_raw(key).map(|val| turn_into_const_value(tcx, val, key))
 }
 
 pub fn eval_to_allocation_raw_provider<'tcx>(
@@ -402,7 +402,7 @@ pub fn eval_to_allocation_raw_provider<'tcx>(
                 ))
             } else {
                 // Convert to raw constant
-                Ok(RawConst { alloc_id: mplace.ptr.assert_ptr().alloc_id, ty: mplace.layout.ty })
+                Ok(ConstAlloc { alloc_id: mplace.ptr.assert_ptr().alloc_id, ty: mplace.layout.ty })
             }
         }
     }

compiler/rustc_mir/src/interpret/memory.rs

@@ -469,7 +469,7 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> Memory<'mir, 'tcx, M> {
                 // Notice that every static has two `AllocId` that will resolve to the same
                 // thing here: one maps to `GlobalAlloc::Static`, this is the "lazy" ID,
                 // and the other one is maps to `GlobalAlloc::Memory`, this is returned by
-                // `const_eval` and it is the "resolved" ID.
+                // `eval_static_initializer` and it is the "resolved" ID.
                 // The resolved ID is never used by the interpreted program, it is hidden.
                 // This is relied upon for soundness of const-patterns; a pointer to the resolved
                 // ID would "sidestep" the checks that make sure consts do not point to statics!

compiler/rustc_mir/src/interpret/place.rs

@@ -13,9 +13,9 @@ use rustc_target::abi::{Abi, Align, FieldsShape, TagEncoding};
 use rustc_target::abi::{HasDataLayout, LayoutOf, Size, VariantIdx, Variants};
 
 use super::{
-    mir_assign_valid_types, truncate, AllocId, AllocMap, Allocation, AllocationExtra, ImmTy,
-    Immediate, InterpCx, InterpResult, LocalValue, Machine, MemoryKind, OpTy, Operand, Pointer,
-    PointerArithmetic, RawConst, Scalar, ScalarMaybeUninit,
+    mir_assign_valid_types, truncate, AllocId, AllocMap, Allocation, AllocationExtra, ConstAlloc,
+    ImmTy, Immediate, InterpCx, InterpResult, LocalValue, Machine, MemoryKind, OpTy, Operand,
+    Pointer, PointerArithmetic, Scalar, ScalarMaybeUninit,
 };
 
 #[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, HashStable)]
@@ -1122,7 +1122,7 @@ where
 
     pub fn raw_const_to_mplace(
         &self,
-        raw: RawConst<'tcx>,
+        raw: ConstAlloc<'tcx>,
     ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::PointerTag>> {
         // This must be an allocation in `tcx`
         let _ = self.tcx.global_alloc(raw.alloc_id);

compiler/rustc_mir/src/interpret/validity.rs

@@ -426,27 +426,27 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
                 if let Some(GlobalAlloc::Static(did)) = alloc_kind {
                     assert!(!self.ecx.tcx.is_thread_local_static(did));
                     assert!(self.ecx.tcx.is_static(did));
-                    // See const_eval::machine::MemoryExtra::can_access_statics for why
-                    // this check is so important.
-                    // This check is reachable when the const just referenced the static,
-                    // but never read it (so we never entered `before_access_global`).
-                    // We also need to do it here instead of going on to avoid running
-                    // into the `before_access_global` check during validation.
-                    if !self.may_ref_to_static {
+                    if self.may_ref_to_static {
+                        // We skip checking other statics. These statics must be sound by
+                        // themselves, and the only way to get broken statics here is by using
+                        // unsafe code.
+                        // The reasons we don't check other statics is twofold. For one, in all
+                        // sound cases, the static was already validated on its own, and second, we
+                        // trigger cycle errors if we try to compute the value of the other static
+                        // and that static refers back to us.
+                        // We might miss const-invalid data,
+                        // but things are still sound otherwise (in particular re: consts
+                        // referring to statics).
+                        return Ok(());
+                    } else {
+                        // See const_eval::machine::MemoryExtra::can_access_statics for why
+                        // this check is so important.
+                        // This check is reachable when the const just referenced the static,
+                        // but never read it (so we never entered `before_access_global`).
                         throw_validation_failure!(self.path,
                             { "a {} pointing to a static variable", kind }
                         );
                     }
-                    // We skip checking other statics. These statics must be sound by themselves,
-                    // and the only way to get broken statics here is by using unsafe code.
-                    // The reasons we don't check other statics is twofold. For one, in all sound
-                    // cases, the static was already validated on its own, and second, we trigger
-                    // cycle errors if we try to compute the value of the other static and that
-                    // static refers back to us.
-                    // We might miss const-invalid data,
-                    // but things are still sound otherwise (in particular re: consts
-                    // referring to statics).
-                    return Ok(());
                 }
             }
             // Proceed recursively even for ZST, no reason to skip them!