Teach AttrNonNullChecker about transparent unions. Fixes crash reported in <rdar://problem/8642434>.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118473 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Checker/AttrNonNullChecker.cpp b/lib/Checker/AttrNonNullChecker.cpp
index d0bccb2..54b7b72 100644
--- a/lib/Checker/AttrNonNullChecker.cpp
+++ b/lib/Checker/AttrNonNullChecker.cpp
@@ -67,6 +67,28 @@
if (!DV)
continue;
+ if (!isa<Loc>(*DV)) {
+ // If the argument is a union type, we want to handle a potential
+ // transparent_unoin GCC extension.
+ QualType T = (*I)->getType();
+ const RecordType *UT = T->getAsUnionType();
+ if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
+ continue;
+ if (nonloc::CompoundVal *CSV = dyn_cast<nonloc::CompoundVal>(DV)) {
+ nonloc::CompoundVal::iterator CSV_I = CSV->begin();
+ assert(CSV_I != CSV->end());
+ V = *CSV_I;
+ DV = dyn_cast<DefinedSVal>(&V);
+ assert(++CSV_I == CSV->end());
+ if (!DV)
+ continue;
+ }
+ else {
+ // FIXME: Handle LazyCompoundVals?
+ continue;
+ }
+ }
+
ConstraintManager &CM = C.getConstraintManager();
const GRState *stateNotNull, *stateNull;
llvm::tie(stateNotNull, stateNull) = CM.AssumeDual(state, *DV);