Move naive_layout_of query provider in separate sibling module

Author: moulins

compiler/rustc_ty_utils/src/layout.rs

@@ -5,8 +5,7 @@ use rustc_index::{IndexSlice, IndexVec};
 use rustc_middle::mir::{GeneratorLayout, GeneratorSavedLocal};
 use rustc_middle::query::{LocalCrate, Providers};
 use rustc_middle::ty::layout::{
-    IntegerExt, LayoutCx, LayoutError, LayoutOf, NaiveAbi, NaiveLayout, TyAndLayout,
-    TyAndNaiveLayout, MAX_SIMD_LANES,
+    IntegerExt, LayoutCx, LayoutError, LayoutOf, TyAndLayout, MAX_SIMD_LANES,
 };
 use rustc_middle::ty::{
     self, AdtDef, EarlyBinder, GenericArgsRef, ReprOptions, Ty, TyCtxt, TypeVisitableExt,
@@ -25,7 +24,7 @@ use crate::errors::{
 use crate::layout_sanity_check::sanity_check_layout;
 
 pub fn provide(providers: &mut Providers) {
-    *providers = Providers { layout_of, naive_layout_of, reference_niches_policy, ..*providers };
+    *providers = Providers { layout_of, reference_niches_policy, ..*providers };
 }
 
 #[instrument(skip(tcx), level = "debug")]
@@ -37,40 +36,6 @@ fn reference_niches_policy<'tcx>(tcx: TyCtxt<'tcx>, _: LocalCrate) -> ReferenceN
 /// crates not specifying `-Z reference-niches`.
 const DEFAULT_REF_NICHES: ReferenceNichePolicy = ReferenceNichePolicy { size: false, align: false };
 
-#[instrument(skip(tcx, query), level = "debug")]
-fn naive_layout_of<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>,
-) -> Result<TyAndNaiveLayout<'tcx>, &'tcx LayoutError<'tcx>> {
-    let (param_env, ty) = query.into_parts();
-    debug!(?ty);
-
-    let param_env = param_env.with_reveal_all_normalized(tcx);
-    let unnormalized_ty = ty;
-
-    // FIXME: We might want to have two different versions of `layout_of`:
-    // One that can be called after typecheck has completed and can use
-    // `normalize_erasing_regions` here and another one that can be called
-    // before typecheck has completed and uses `try_normalize_erasing_regions`.
-    let ty = match tcx.try_normalize_erasing_regions(param_env, ty) {
-        Ok(t) => t,
-        Err(normalization_error) => {
-            return Err(tcx
-                .arena
-                .alloc(LayoutError::NormalizationFailure(ty, normalization_error)));
-        }
-    };
-
-    if ty != unnormalized_ty {
-        // Ensure this layout is also cached for the normalized type.
-        return tcx.naive_layout_of(param_env.and(ty));
-    }
-
-    let cx = LayoutCx { tcx, param_env };
-    let layout = naive_layout_of_uncached(&cx, ty)?;
-    Ok(TyAndNaiveLayout { ty, layout })
-}
-
 #[instrument(skip(tcx, query), level = "debug")]
 fn layout_of<'tcx>(
     tcx: TyCtxt<'tcx>,
@@ -90,13 +55,9 @@ fn layout_of<'tcx>(
     let cx = LayoutCx { tcx, param_env };
     let layout = layout_of_uncached(&cx, ty)?;
 
-    if !naive.is_refined_by(layout) {
-        bug!("the naive layout isn't refined by the actual layout:\n{:#?}\n{:#?}", naive, layout,);
-    }
-
     let layout = TyAndLayout { ty, layout };
     record_layout_for_printing(&cx, layout);
-    sanity_check_layout(&cx, &layout);
+    sanity_check_layout(&cx, &layout, &naive);
 
     Ok(layout)
 }
@@ -108,191 +69,6 @@ fn error<'tcx>(
     cx.tcx.arena.alloc(err)
 }
 
-fn naive_layout_of_uncached<'tcx>(
-    cx: &LayoutCx<'tcx, TyCtxt<'tcx>>,
-    ty: Ty<'tcx>,
-) -> Result<NaiveLayout, &'tcx LayoutError<'tcx>> {
-    let tcx = cx.tcx;
-    let dl = cx.data_layout();
-
-    let scalar = |value: Primitive| NaiveLayout {
-        abi: NaiveAbi::Scalar(value),
-        size: value.size(dl),
-        align: value.align(dl).abi,
-        exact: true,
-    };
-
-    let univariant = |fields: &mut dyn Iterator<Item = Ty<'tcx>>,
-                      repr: &ReprOptions|
-     -> Result<NaiveLayout, &'tcx LayoutError<'tcx>> {
-        if repr.pack.is_some() && repr.align.is_some() {
-            cx.tcx.sess.delay_span_bug(DUMMY_SP, "struct cannot be packed and aligned");
-            return Err(error(cx, LayoutError::Unknown(ty)));
-        }
-
-        let linear = repr.inhibit_struct_field_reordering_opt();
-        let pack = repr.pack.unwrap_or(Align::MAX);
-        let mut layout = NaiveLayout::EMPTY;
-
-        for field in fields {
-            let field = cx.naive_layout_of(field)?.packed(pack);
-            if linear {
-                layout = layout.pad_to_align(field.align);
-            }
-            layout = layout
-                .concat(&field, dl)
-                .ok_or_else(|| error(cx, LayoutError::SizeOverflow(ty)))?;
-        }
-
-        if let Some(align) = repr.align {
-            layout = layout.align_to(align);
-        }
-
-        if linear {
-            layout.abi = layout.abi.as_aggregate();
-        }
-
-        Ok(layout.pad_to_align(layout.align))
-    };
-
-    debug_assert!(!ty.has_non_region_infer());
-
-    Ok(match *ty.kind() {
-        // Basic scalars
-        ty::Bool => scalar(Int(I8, false)),
-        ty::Char => scalar(Int(I32, false)),
-        ty::Int(ity) => scalar(Int(Integer::from_int_ty(dl, ity), true)),
-        ty::Uint(ity) => scalar(Int(Integer::from_uint_ty(dl, ity), false)),
-        ty::Float(fty) => scalar(match fty {
-            ty::FloatTy::F32 => F32,
-            ty::FloatTy::F64 => F64,
-        }),
-        ty::FnPtr(_) => scalar(Pointer(dl.instruction_address_space)),
-
-        // The never type.
-        ty::Never => NaiveLayout { abi: NaiveAbi::Uninhabited, ..NaiveLayout::EMPTY },
-
-        // Potentially-wide pointers.
-        ty::Ref(_, pointee, _) | ty::RawPtr(ty::TypeAndMut { ty: pointee, .. }) => {
-            let data_ptr = scalar(Pointer(AddressSpace::DATA));
-            if let Some(metadata) = ptr_metadata_scalar(cx, pointee)? {
-                // Effectively a (ptr, meta) tuple.
-                let l = data_ptr
-                    .concat(&scalar(metadata.primitive()), dl)
-                    .ok_or_else(|| error(cx, LayoutError::SizeOverflow(ty)))?;
-                l.pad_to_align(l.align)
-            } else {
-                // No metadata, this is a thin pointer.
-                data_ptr
-            }
-        }
-
-        ty::Dynamic(_, _, ty::DynStar) => {
-            let ptr = scalar(Pointer(AddressSpace::DATA));
-            ptr.concat(&ptr, dl).ok_or_else(|| error(cx, LayoutError::SizeOverflow(ty)))?
-        }
-
-        // Arrays and slices.
-        ty::Array(element, count) => {
-            let count = compute_array_count(cx, count)
-                .ok_or_else(|| error(cx, LayoutError::Unknown(ty)))?;
-            let element = cx.naive_layout_of(element)?;
-            NaiveLayout {
-                abi: element.abi.as_aggregate(),
-                size: element
-                    .size
-                    .checked_mul(count, cx)
-                    .ok_or_else(|| error(cx, LayoutError::SizeOverflow(ty)))?,
-                ..*element
-            }
-        }
-        ty::Slice(element) => {
-            let element = cx.naive_layout_of(element)?;
-            NaiveLayout { abi: NaiveAbi::Unsized, size: Size::ZERO, ..*element }
-        }
-
-        ty::FnDef(..) => NaiveLayout::EMPTY,
-
-        // Unsized types.
-        ty::Str | ty::Dynamic(_, _, ty::Dyn) | ty::Foreign(..) => {
-            NaiveLayout { abi: NaiveAbi::Unsized, ..NaiveLayout::EMPTY }
-        }
-
-        // FIXME(reference_niches): try to actually compute a reasonable layout estimate,
-        // without duplicating too much code from `generator_layout`.
-        ty::Generator(..) => NaiveLayout { exact: false, ..NaiveLayout::EMPTY },
-
-        ty::Closure(_, ref substs) => {
-            univariant(&mut substs.as_closure().upvar_tys(), &ReprOptions::default())?
-        }
-
-        ty::Tuple(tys) => univariant(&mut tys.iter(), &ReprOptions::default())?,
-
-        ty::Adt(def, substs) if def.is_union() => {
-            let repr = def.repr();
-            let pack = repr.pack.unwrap_or(Align::MAX);
-            if repr.pack.is_some() && repr.align.is_some() {
-                cx.tcx.sess.delay_span_bug(DUMMY_SP, "union cannot be packed and aligned");
-                return Err(error(cx, LayoutError::Unknown(ty)));
-            }
-
-            let mut layout = NaiveLayout::EMPTY;
-            for f in &def.variants()[FIRST_VARIANT].fields {
-                let field = cx.naive_layout_of(f.ty(tcx, substs))?;
-                layout = layout.union(&field.packed(pack));
-            }
-
-            // Unions are always inhabited, and never scalar if `repr(C)`.
-            if !matches!(layout.abi, NaiveAbi::Scalar(_)) || repr.inhibit_enum_layout_opt() {
-                layout.abi = NaiveAbi::Sized;
-            }
-
-            if let Some(align) = repr.align {
-                layout = layout.align_to(align);
-            }
-            layout.pad_to_align(layout.align)
-        }
-
-        ty::Adt(def, substs) => {
-            let repr = def.repr();
-            let base = NaiveLayout {
-                // For simplicity, assume that any enum has its discriminant field (if it exists)
-                // niched inside one of the variants; this will underestimate the size (and sometimes
-                // alignment) of enums. We also doesn't compute exact alignment for SIMD structs.
-                // FIXME(reference_niches): Be smarter here.
-                // Also consider adding a special case for null-optimized enums, so that we can have
-                // `Option<&T>: PointerLike` in generic contexts.
-                exact: !def.is_enum() && !repr.simd(),
-                // An ADT with no inhabited variants should have an uninhabited ABI.
-                abi: NaiveAbi::Uninhabited,
-                ..NaiveLayout::EMPTY
-            };
-
-            let layout = def.variants().iter().try_fold(base, |layout, v| {
-                let mut fields = v.fields.iter().map(|f| f.ty(tcx, substs));
-                let vlayout = univariant(&mut fields, &repr)?;
-                Ok(layout.union(&vlayout))
-            })?;
-            layout.pad_to_align(layout.align)
-        }
-
-        // Types with no meaningful known layout.
-        ty::Alias(..) => {
-            // NOTE(eddyb) `layout_of` query should've normalized these away,
-            // if that was possible, so there's no reason to try again here.
-            return Err(error(cx, LayoutError::Unknown(ty)));
-        }
-
-        ty::Bound(..) | ty::GeneratorWitness(..) | ty::GeneratorWitnessMIR(..) | ty::Infer(_) => {
-            bug!("Layout::compute: unexpected type `{}`", ty)
-        }
-
-        ty::Placeholder(..) | ty::Param(_) | ty::Error(_) => {
-            return Err(error(cx, LayoutError::Unknown(ty)));
-        }
-    })
-}
-
 fn univariant_uninterned<'tcx>(
     cx: &LayoutCx<'tcx, TyCtxt<'tcx>>,
     ty: Ty<'tcx>,
@@ -739,7 +515,7 @@ fn layout_of_uncached<'tcx>(
     })
 }
 
-fn compute_array_count<'tcx>(
+pub(crate) fn compute_array_count<'tcx>(
     cx: &LayoutCx<'tcx, TyCtxt<'tcx>>,
     mut count: ty::Const<'tcx>,
 ) -> Option<u64> {
@@ -754,7 +530,7 @@ fn compute_array_count<'tcx>(
     count.try_eval_target_usize(tcx, param_env)
 }
 
-fn ptr_metadata_scalar<'tcx>(
+pub(crate) fn ptr_metadata_scalar<'tcx>(
     cx: &LayoutCx<'tcx, TyCtxt<'tcx>>,
     pointee: Ty<'tcx>,
 ) -> Result<Option<Scalar>, &'tcx LayoutError<'tcx>> {