move ConstValue into mir

this way we have mir::ConstValue and ty::ValTree as reasonably parallel

compiler/rustc_const_eval/src/const_eval/eval_queries.rs

@@ -4,9 +4,9 @@ use crate::errors::ConstEvalError;
 use either::{Left, Right};
 
 use rustc_hir::def::DefKind;
-use rustc_middle::mir;
 use rustc_middle::mir::interpret::{ErrorHandled, InterpErrorInfo};
 use rustc_middle::mir::pretty::write_allocation_bytes;
+use rustc_middle::mir::{self, ConstAlloc, ConstValue};
 use rustc_middle::traits::Reveal;
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::print::with_no_trimmed_paths;
@@ -18,9 +18,8 @@ use super::{CanAccessStatics, CompileTimeEvalContext, CompileTimeInterpreter};
 use crate::errors;
 use crate::interpret::eval_nullary_intrinsic;
 use crate::interpret::{
-    intern_const_alloc_recursive, ConstAlloc, ConstValue, CtfeValidationMode, GlobalId, Immediate,
-    InternKind, InterpCx, InterpError, InterpResult, MPlaceTy, MemoryKind, OpTy, RefTracking,
-    StackPopCleanup,
+    intern_const_alloc_recursive, CtfeValidationMode, GlobalId, Immediate, InternKind, InterpCx,
+    InterpError, InterpResult, MPlaceTy, MemoryKind, OpTy, RefTracking, StackPopCleanup,
 };
 
 // Returns a pointer to where the result lives

compiler/rustc_const_eval/src/const_eval/mod.rs

@@ -1,7 +1,7 @@
 // Not in interpret to make sure we do not use private implementation details
 
 use crate::errors::MaxNumNodesInConstErr;
-use crate::interpret::{intern_const_alloc_recursive, ConstValue, InternKind, InterpCx, Scalar};
+use crate::interpret::{intern_const_alloc_recursive, InternKind, InterpCx, Scalar};
 use rustc_middle::mir;
 use rustc_middle::mir::interpret::{EvalToValTreeResult, GlobalId};
 use rustc_middle::ty::{self, Ty, TyCtxt};
@@ -22,7 +22,7 @@ pub(crate) use valtrees::{const_to_valtree_inner, valtree_to_const_value};
 pub(crate) fn const_caller_location(
     tcx: TyCtxt<'_>,
     (file, line, col): (Symbol, u32, u32),
-) -> ConstValue<'_> {
+) -> mir::ConstValue<'_> {
     trace!("const_caller_location: {}:{}:{}", file, line, col);
     let mut ecx = mk_eval_cx(tcx, DUMMY_SP, ty::ParamEnv::reveal_all(), CanAccessStatics::No);
 
@@ -30,7 +30,7 @@ pub(crate) fn const_caller_location(
     if intern_const_alloc_recursive(&mut ecx, InternKind::Constant, &loc_place).is_err() {
         bug!("intern_const_alloc_recursive should not error in this case")
     }
-    ConstValue::Scalar(Scalar::from_maybe_pointer(loc_place.ptr(), &tcx))
+    mir::ConstValue::Scalar(Scalar::from_maybe_pointer(loc_place.ptr(), &tcx))
 }
 
 // We forbid type-level constants that contain more than `VALTREE_MAX_NODES` nodes.
@@ -87,7 +87,7 @@ pub(crate) fn eval_to_valtree<'tcx>(
 #[instrument(skip(tcx), level = "debug")]
 pub(crate) fn try_destructure_mir_constant_for_diagnostics<'tcx>(
     tcx: TyCtxt<'tcx>,
-    val: ConstValue<'tcx>,
+    val: mir::ConstValue<'tcx>,
     ty: Ty<'tcx>,
 ) -> Option<mir::DestructuredConstant<'tcx>> {
     let param_env = ty::ParamEnv::reveal_all();

compiler/rustc_const_eval/src/const_eval/valtrees.rs

@@ -4,9 +4,10 @@ use super::{ValTreeCreationError, ValTreeCreationResult, VALTREE_MAX_NODES};
 use crate::const_eval::CanAccessStatics;
 use crate::interpret::MPlaceTy;
 use crate::interpret::{
-    intern_const_alloc_recursive, ConstValue, ImmTy, Immediate, InternKind, MemPlaceMeta,
-    MemoryKind, PlaceTy, Projectable, Scalar,
+    intern_const_alloc_recursive, ImmTy, Immediate, InternKind, MemPlaceMeta, MemoryKind, PlaceTy,
+    Projectable, Scalar,
 };
+use rustc_middle::mir;
 use rustc_middle::ty::layout::{LayoutCx, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, ScalarInt, Ty, TyCtxt};
 use rustc_span::source_map::DUMMY_SP;
@@ -206,7 +207,7 @@ pub fn valtree_to_const_value<'tcx>(
     tcx: TyCtxt<'tcx>,
     param_env_ty: ty::ParamEnvAnd<'tcx, Ty<'tcx>>,
     valtree: ty::ValTree<'tcx>,
-) -> ConstValue<'tcx> {
+) -> mir::ConstValue<'tcx> {
     // Basic idea: We directly construct `Scalar` values from trivial `ValTree`s
     // (those for constants with type bool, int, uint, float or char).
     // For all other types we create an `MPlace` and fill that by walking
@@ -219,10 +220,10 @@ pub fn valtree_to_const_value<'tcx>(
     match ty.kind() {
         ty::FnDef(..) => {
             assert!(valtree.unwrap_branch().is_empty());
-            ConstValue::ZeroSized
+            mir::ConstValue::ZeroSized
         }
         ty::Bool | ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::Char => match valtree {
-            ty::ValTree::Leaf(scalar_int) => ConstValue::Scalar(Scalar::Int(scalar_int)),
+            ty::ValTree::Leaf(scalar_int) => mir::ConstValue::Scalar(Scalar::Int(scalar_int)),
             ty::ValTree::Branch(_) => bug!(
                 "ValTrees for Bool, Int, Uint, Float or Char should have the form ValTree::Leaf"
             ),
@@ -237,7 +238,7 @@ pub fn valtree_to_const_value<'tcx>(
             let layout = tcx.layout_of(param_env_ty).unwrap();
             if layout.is_zst() {
                 // Fast path to avoid some allocations.
-                return ConstValue::ZeroSized;
+                return mir::ConstValue::ZeroSized;
             }
             if layout.abi.is_scalar()
                 && (matches!(ty.kind(), ty::Tuple(_))