bjoernager/rust
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add intrinsic to access vtable size and align

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This commit is contained in:
Ralf Jung 2022-07-18 09:48:20 -04:00
parent b5a32d01f4
commit 8affef2ccb
6 changed files with 66 additions and 2 deletions
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12
compiler/rustc_const_eval/src/interpret/intrinsics.rs
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@ -492,6 +492,18 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
let result = self.raw_eq_intrinsic(&args[0], &args[1])?;
self.write_scalar(result, dest)?;
}
sym::vtable_size => {
let ptr = self.read_pointer(&args[0])?;
let (size, _align) = self.get_vtable_size_and_align(ptr)?;
self.write_scalar(Scalar::from_machine_usize(size.bytes(), self), dest)?;
}
sym::vtable_align => {
let ptr = self.read_pointer(&args[0])?;
let (_size, align) = self.get_vtable_size_and_align(ptr)?;
self.write_scalar(Scalar::from_machine_usize(align.bytes(), self), dest)?;
}
_ => return Ok(false),
}