Add param_env parameter to pointee_info_at.

An associated type ParamEnv has been added to TyLayoutMethods to
facilitate this.

Author: wildarch

src/librustc/ty/layout.rs

@@ -1666,6 +1666,8 @@ impl<'a, 'tcx, C> TyLayoutMethods<'tcx, C> for Ty<'tcx>
     where C: LayoutOf<Ty = Ty<'tcx>> + HasTyCtxt<'tcx>,
           C::TyLayout: MaybeResult<TyLayout<'tcx>>
 {
+    type ParamEnv = ty::ParamEnv<'tcx>;
+
     fn for_variant(this: TyLayout<'tcx>, cx: &C, variant_index: VariantIdx) -> TyLayout<'tcx> {
         let details = match this.variants {
             Variants::Single { index } if index == variant_index => this.details,
@@ -1837,6 +1839,7 @@ impl<'a, 'tcx, C> TyLayoutMethods<'tcx, C> for Ty<'tcx>
         this: TyLayout<'tcx>,
         cx: &C,
         offset: Size,
+        param_env: Self::ParamEnv,
     ) -> Option<PointeeInfo> {
         match this.ty.sty {
             ty::RawPtr(mt) if offset.bytes() == 0 => {
@@ -1850,7 +1853,7 @@ impl<'a, 'tcx, C> TyLayoutMethods<'tcx, C> for Ty<'tcx>
 
             ty::Ref(_, ty, mt) if offset.bytes() == 0 => {
                 let tcx = cx.tcx();
-                let is_freeze = ty.is_freeze(tcx, ty::ParamEnv::reveal_all(), DUMMY_SP);
+                let is_freeze = ty.is_freeze(tcx, param_env, DUMMY_SP);
                 let kind = match mt {
                     hir::MutImmutable => if is_freeze {
                         PointerKind::Frozen
@@ -1929,7 +1932,7 @@ impl<'a, 'tcx, C> TyLayoutMethods<'tcx, C> for Ty<'tcx>
                                 .and_then(|field| {
                                     if ptr_end <= field_start + field.size {
                                         // We found the right field, look inside it.
-                                        Self::pointee_info_at(field, cx, offset - field_start)
+                                        Self::pointee_info_at(field, cx, offset - field_start, param_env)
                                     } else {
                                         None
                                     }

src/librustc_codegen_llvm/type_of.rs

@@ -386,7 +386,7 @@ impl<'tcx> LayoutLlvmExt<'tcx> for TyLayout<'tcx> {
             return pointee;
         }
 
-        let result = Ty::pointee_info_at(*self, cx, offset);
+        let result = Ty::pointee_info_at(*self, cx, offset, ty::ParamEnv::reveal_all());
 
         cx.pointee_infos.borrow_mut().insert((self.ty, offset), result);
         result

src/librustc_target/abi/mod.rs

@@ -933,6 +933,8 @@ pub struct PointeeInfo {
 }
 
 pub trait TyLayoutMethods<'a, C: LayoutOf<Ty = Self>>: Sized {
+    type ParamEnv;
+
     fn for_variant(
         this: TyLayout<'a, Self>,
         cx: &C,
@@ -942,7 +944,8 @@ pub trait TyLayoutMethods<'a, C: LayoutOf<Ty = Self>>: Sized {
     fn pointee_info_at(
         this: TyLayout<'a, Self>,
         cx: &C,
-        offset: Size
+        offset: Size,
+        param_env: Self::ParamEnv,
     ) -> Option<PointeeInfo>;
 }