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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - If dyn_cast<TYPE>(X) is non-null, assume X is non-null as well?"
href="https://bugs.llvm.org/show_bug.cgi?id=43366">43366</a>
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<th>Summary</th>
<td>If dyn_cast<TYPE>(X) is non-null, assume X is non-null as well?
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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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>Static Analyzer
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<th>Assignee</th>
<td>dcoughlin@apple.com
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
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</tr>
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<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org, noqnoqneo@gmail.com
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<p>
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<pre>Noticed here:
<a href="https://llvm.org/reports/scan-build/report-AArch64TargetTransformInfo.cpp-getValueType-12-1.html#EndPath">https://llvm.org/reports/scan-build/report-AArch64TargetTransformInfo.cpp-getValueType-12-1.html#EndPath</a>
if (auto *VTy = dyn_cast<VectorType>(Ty)) {
Type *EltTy = VTy->getElementType();
// Lower vectors of pointers to native pointer types.
if (auto *PTy = dyn_cast<PointerType>(EltTy)) {
EVT PointerTy(getPointerTy(DL, PTy->getAddressSpace()));
EltTy = PointerTy.getTypeForEVT(Ty->getContext());
}
return EVT::getVectorVT(Ty->getContext(), EVT::getEVT(EltTy, false),
VTy->getElementCount());
}
The warning says that Ty->getContext() can be a null pointer, but if we know
that VTy is non-null and is a dyn_cast from Ty, then shouldn't Ty be known to
be non-null?</pre>
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