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interpret: make isize::MAX the limit for dynamic value sizes

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This commit is contained in:
Ralf Jung
2022-03-27 19:34:16 -04:00
parent df20355fa9
commit a421cbbead
3 changed files with 15 additions and 8 deletions
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5
compiler/rustc_const_eval/src/interpret/traits.rs
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@@ -110,16 +110,17 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
.read_ptr_sized(pointer_size * u64::try_from(COMMON_VTABLE_ENTRIES_SIZE).unwrap())?
.check_init()?;
let size = size.to_machine_usize(self)?;
let size = Size::from_bytes(size);
let align = vtable
.read_ptr_sized(pointer_size * u64::try_from(COMMON_VTABLE_ENTRIES_ALIGN).unwrap())?
.check_init()?;
let align = align.to_machine_usize(self)?;
let align = Align::from_bytes(align).map_err(|e| err_ub!(InvalidVtableAlignment(e)))?;
if size >= self.tcx.data_layout.obj_size_bound() {
if size > self.max_size_of_val() {
throw_ub!(InvalidVtableSize);
}
Ok((Size::from_bytes(size), align))
Ok((size, align))
}
pub fn read_new_vtable_after_trait_upcasting_from_vtable(