https://bugs.llvm.org/show_bug.cgi?id=43536
Bug ID: 43536
Summary: Static analyzer isa and dyn_cast mismatch for the same
pointer
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Static Analyzer
Assignee: dcoughlin at apple.com
Reporter: llvm-dev at redking.me.uk
CC: dcoughlin at apple.com, llvm-bugs at lists.llvm.org,
noqnoqneo at gmail.com
https://llvm.org/reports/scan-build/report-LoopCacheAnalysis.cpp-getLastCoefficient-5-1.html#EndPath
const SCEV *IndexedReference::getLastCoefficient() const {
const SCEV *LastSubscript = getLastSubscript();
assert(isa<SCEVAddRecExpr>(LastSubscript) &&
"Expecting a SCEV add recurrence expression");
const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(LastSubscript);
return AR->getStepRecurrence(SE);
}
The analyzer assumes that LastSubscript is a SCEVAddRecExpr in the assert but
in the following line assumes that it isn't a SCEVAddRecExpr and then warns
about a null dereference.
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