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fixed shift overflow

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Fix according to oli-obk
(https://github.com/rust-lang/rust/pull/58717#issuecomment-477494457)
This commit is contained in:
Marcel Hellwig 2019-03-28 09:31:18 +01:00
parent 7330525e8f
commit 8f3e862797
1 changed files with 2 additions and 1 deletions
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3
src/librustc_codegen_llvm/debuginfo/metadata.rs
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@ -22,6 +22,7 @@ use rustc::hir::CodegenFnAttrFlags;
use rustc::hir::def::CtorKind;
use rustc::hir::def_id::{DefId, CrateNum, LOCAL_CRATE};
use rustc::ich::NodeIdHashingMode;
use rustc::mir::interpret::truncate;
use rustc_data_structures::fingerprint::Fingerprint;
use rustc::ty::Instance;
use rustc::ty::{self, AdtKind, ParamEnv, Ty, TyCtxt};
@ -1366,7 +1367,7 @@ impl EnumMemberDescriptionFactory<'ll, 'tcx> {
let value = (i.as_u32() as u128)
.wrapping_sub(niche_variants.start().as_u32() as u128)
.wrapping_add(niche_start);
let value = value & ((1u128 << niche.value.size(cx).bits()) - 1);
let value = truncate(value, niche.value.size(cx));
Some(value as u64)
};