================
@@ -393,6 +401,173 @@ ProgramStateRef
CStringChecker::checkNonNull(CheckerContext &C,
return stateNonNull;
}
+static std::optional<NonLoc> getIndex(ProgramStateRef State,
+ const ElementRegion *ER, CharKind CK) {
+ SValBuilder &SValBuilder = State->getStateManager().getSValBuilder();
+ ASTContext &Ctx = SValBuilder.getContext();
+
+ if (CK == CharKind::Regular) {
+ if (ER->getValueType() != Ctx.CharTy)
+ return {};
+ return ER->getIndex();
+ }
+
+ if (ER->getValueType() != Ctx.WideCharTy)
+ return {};
+
+ QualType SizeTy = Ctx.getSizeType();
+ NonLoc WideSize =
+ SValBuilder
+ .makeIntVal(Ctx.getTypeSizeInChars(Ctx.WideCharTy).getQuantity(),
+ SizeTy)
+ .castAs<NonLoc>();
+ SVal Offset =
+ SValBuilder.evalBinOpNN(State, BO_Mul, ER->getIndex(), WideSize, SizeTy);
+ if (Offset.isUnknown())
+ return {};
+ return Offset.castAs<NonLoc>();
+}
+
+// Try to get hold of the origin regin (e.g. the actual array region from an
+// element region).
+static const TypedValueRegion *getOriginRegion(const ElementRegion *ER) {
+ const MemRegion *MR = ER->getSuperRegion();
+ const MemRegion *Ret = MR;
+ assert(MR);
+ if (const auto *sym = MR->getAs<SymbolicRegion>()) {
+ SymbolRef sym2 = sym->getSymbol();
+ if (!sym2)
+ return nullptr;
+ Ret = sym2->getOriginRegion();
+ }
+ if (const auto *element = MR->getAs<ElementRegion>()) {
+ Ret = element->getBaseRegion();
----------------
Szelethus wrote:
I changed `getBaseRegion()` to `getSuperRegion()`, because we're only really
trying to peel off a simple `ElementRegeion` layer. Unfortunately, I stumbled
upon a big in StoreManager, for which I added a new test case
(`memcpy_array_from_matrix()`).
https://github.com/llvm/llvm-project/pull/95408
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