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Initial UnsafePinned/UnsafeUnpin impl [Part 1: Libs]

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Sky 2025-02-14 15:56:24 -05:00
parent ae06b79dcb
commit 21b7360a9a
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11 changed files with 290 additions and 8 deletions
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7
compiler/rustc_ty_utils/src/layout.rs
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@ -514,6 +514,9 @@ fn layout_of_uncached<'tcx>(
return map_layout(cx.calc.layout_of_union(&def.repr(), &variants));
}
// UnsafeCell and UnsafePinned both disable niche optimizations
let is_special_no_niche = def.is_unsafe_cell() || def.is_unsafe_pinned();
let get_discriminant_type =
|min, max| abi::Integer::repr_discr(tcx, ty, &def.repr(), min, max);
@ -542,7 +545,7 @@ fn layout_of_uncached<'tcx>(
&def.repr(),
&variants,
def.is_enum(),
def.is_unsafe_cell(),
is_special_no_niche,
tcx.layout_scalar_valid_range(def.did()),
get_discriminant_type,
discriminants_iter(),
@ -568,7 +571,7 @@ fn layout_of_uncached<'tcx>(
&def.repr(),
&variants,
def.is_enum(),
def.is_unsafe_cell(),
is_special_no_niche,
tcx.layout_scalar_valid_range(def.did()),
get_discriminant_type,
discriminants_iter(),