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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - RuntimeDyldImpl::emitSection - Accidental clearing of the most significant bits"
href="https://bugs.llvm.org/show_bug.cgi?id=41664">41664</a>
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<th>Summary</th>
<td>RuntimeDyldImpl::emitSection - Accidental clearing of the most significant bits
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Generic Execution Engine Support
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
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<th>CC</th>
<td>1101.debian@gmail.com, lhames@gmail.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>Reported in <a href="https://www.viva64.com/en/b/0629/">https://www.viva64.com/en/b/0629/</a>
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</pre>
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