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Fix regression introduced in r80786 and reported in PR 4867. We should use 

'dyn_cast' instead of 'cast' as the denominator value could be UnknownVal (and
is not guaranteed to be a DefinedVal).

llvm-svn: 80869
This commit is contained in:
Ted Kremenek 2009-09-03 01:48:03 +00:00
parent f7188325ef
commit b117fd9168
1 changed files with 7 additions and 2 deletions
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9
clang/lib/Analysis/GRExprEngineInternalChecks.cpp
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@ -716,11 +716,16 @@ void CheckBadDiv::PreVisitBinaryOperator(CheckerContext &C,
return;
}
// Handle the case where 'Denom' is UnknownVal.
const DefinedSVal *DV = dyn_cast<DefinedSVal>(&Denom);
if (!DV)
return;
// Check for divide by zero.
ConstraintManager &CM = C.getConstraintManager();
const GRState *stateNotZero, *stateZero;
llvm::tie(stateNotZero, stateZero) = CM.AssumeDual(C.getState(),
cast<DefinedSVal>(Denom));
llvm::tie(stateNotZero, stateZero) = CM.AssumeDual(C.getState(), *DV);
if (stateZero && !stateNotZero) {
if (ExplodedNode *N = C.GenerateNode(B, stateZero, true)) {