Initial support for pointer arithmetic. Only support concrete indexes and
offsets for now.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65814 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/RegionStore.cpp b/lib/Analysis/RegionStore.cpp
index e6e530b..7ab54b8 100644
--- a/lib/Analysis/RegionStore.cpp
+++ b/lib/Analysis/RegionStore.cpp
@@ -170,6 +170,8 @@
CastResult CastRegion(const GRState* state, const MemRegion* R,
QualType CastToTy);
+ SVal EvalBinOp(BinaryOperator::Opcode Op, Loc L, NonLoc R);
+
/// The high level logic for this method is this:
/// Retrieve (L)
/// if L has binding
@@ -551,6 +553,33 @@
return CastResult(AddRegionView(state, ViewR, R), ViewR);
}
+SVal RegionStoreManager::EvalBinOp(BinaryOperator::Opcode Op, Loc L, NonLoc R) {
+ // Assume the base location is MemRegionVal(ElementRegion).
+
+ if (!isa<loc::MemRegionVal>(L)) {
+ return UnknownVal();
+ }
+
+ const MemRegion* MR = cast<loc::MemRegionVal>(L).getRegion();
+
+ const ElementRegion* ER = cast<ElementRegion>(MR);
+ SVal Idx = ER->getIndex();
+
+ nonloc::ConcreteInt* Base = dyn_cast<nonloc::ConcreteInt>(&Idx);
+ nonloc::ConcreteInt* Offset = dyn_cast<nonloc::ConcreteInt>(&R);
+
+ // Only support concrete integer indexes for now.
+ if (Base && Offset) {
+ SVal NewIdx = Base->EvalBinOp(getBasicVals(), Op, *Offset);
+
+ const MemRegion* NewER = MRMgr.getElementRegion(NewIdx,
+ ER->getArrayRegion());
+ return Loc::MakeVal(NewER);
+
+ } else
+ return UnknownVal();
+}
+
SVal RegionStoreManager::Retrieve(const GRState* St, Loc L, QualType T) {
assert(!isa<UnknownVal>(L) && "location unknown");
assert(!isa<UndefinedVal>(L) && "location undefined");