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Sanity check the bits argument to the from_bits function

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This commit is contained in:
Oliver Schneider 2018-05-24 11:26:42 +02:00
parent f1ea9ef315
commit 1f9fa53738
1 changed files with 6 additions and 3 deletions
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9
src/librustc/ty/sty.rs
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@ -1824,10 +1824,13 @@ impl<'tcx> Const<'tcx> {
ty: ParamEnvAnd<'tcx, Ty<'tcx>>,
) -> &'tcx Self {
let ty = tcx.global_tcx().lift(&ty).unwrap();
let defined = tcx.global_tcx().layout_of(ty).unwrap_or_else(|e| {
let size = tcx.global_tcx().layout_of(ty).unwrap_or_else(|e| {
panic!("could not compute layout for {:?}: {:?}", ty, e)
}).size.bits() as u8;
Self::from_scalar(tcx, Scalar::Bits { bits, defined }, ty.value)
}).size;
let amt = 128 - size.bits();
let truncated = (bits << amt) >> amt;
assert_eq!(truncated, bits, "from_bits called with untruncated value");
Self::from_scalar(tcx, Scalar::Bits { bits, defined: size.bits() as u8 }, ty.value)
}
#[inline]