https://bugs.llvm.org/show_bug.cgi?id=41664
Bug ID: 41664
Summary: RuntimeDyldImpl::emitSection - Accidental clearing of
the most significant bits
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Generic Execution Engine Support
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: 1101.deb...@gmail.com, lha...@gmail.com,
llvm-bugs@lists.llvm.org
Reported in https://www.viva64.com/en/b/0629/
Expected<unsigned>
RuntimeDyldImpl::emitSection(const ObjectFile &Obj,
const SectionRef &Section,
bool IsCode) {
....
uint64_t DataSize = Section.getSize();
....
if (StubBufSize > 0)
DataSize &= ~(getStubAlignment() - 1);
....
}
getStubAlignment returns an unsigned, meaning the mask won't extend to the full
uint64_t range, incorrectly aligning the datasize.
The article suggests it should be:
DataSize &= ~(static_cast<uint64_t>(getStubAlignment()) - 1);
or
DataSize &= ~(getStubAlignment() - 1ULL);
Last touched by @lhames at rL310517
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