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Bad tags are unreachable

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This commit is contained in:
varkor 2018-02-23 22:15:07 +00:00
parent 8b2037c6fe
commit f2b9686134
1 changed files with 7 additions and 8 deletions
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15
src/librustc/ty/subst.rs
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@ -18,6 +18,7 @@ use serialize::{self, Encodable, Encoder, Decodable, Decoder};
use syntax_pos::{Span, DUMMY_SP};
use rustc_data_structures::accumulate_vec::AccumulateVec;
use core::intrinsics;
use core::nonzero::NonZero;
use std::fmt;
use std::iter;
@ -84,14 +85,12 @@ impl<'tcx> Kind<'tcx> {
#[inline]
pub fn unpack(self) -> UnpackedKind<'tcx> {
let ptr = self.ptr.get();
match ptr & TAG_MASK {
REGION_TAG => unsafe {
UnpackedKind::Lifetime(&*((ptr & !TAG_MASK) as *const _))
},
TYPE_TAG => unsafe {
UnpackedKind::Type(&*((ptr & !TAG_MASK) as *const _))
},
_ => bug!("packed kind has invalid tag")
unsafe {
match ptr & TAG_MASK {
REGION_TAG => UnpackedKind::Lifetime(&*((ptr & !TAG_MASK) as *const _)),
TYPE_TAG => UnpackedKind::Type(&*((ptr & !TAG_MASK) as *const _)),
_ => intrinsics::unreachable()
}
}
}
}