Add 'MemRegion::getBaseRegion()', a utility method to strip ElementRegions with
index 0. This will be used for refinements to InvalidateRegion and CastRegion.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77481 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/MemRegion.cpp b/lib/Analysis/MemRegion.cpp
index 9b8f7c8..a708bd3 100644
--- a/lib/Analysis/MemRegion.cpp
+++ b/lib/Analysis/MemRegion.cpp
@@ -398,3 +398,23 @@
}
return R;
}
+
+const MemRegion *MemRegion::getBaseRegion() const {
+ const MemRegion *R = this;
+ while (true) {
+ if (const ElementRegion *ER = dyn_cast<ElementRegion>(R)) {
+ // FIXME: generalize. Essentially we want to strip away ElementRegions
+ // that were layered on a symbolic region because of casts. We only
+ // want to strip away ElementRegions, however, where the index is 0.
+ SVal index = ER->getIndex();
+ if (nonloc::ConcreteInt *CI = dyn_cast<nonloc::ConcreteInt>(&index)) {
+ if (CI->getValue().getZExtValue() == 0) {
+ R = ER->getSuperRegion();
+ continue;
+ }
+ }
+ }
+ break;
+ }
+ return R;
+}
diff --git a/lib/Analysis/SVals.cpp b/lib/Analysis/SVals.cpp
index a5ba199..6f480e8 100644
--- a/lib/Analysis/SVals.cpp
+++ b/lib/Analysis/SVals.cpp
@@ -72,7 +72,7 @@
// FIXME: should we consider SymbolRef wrapped in CodeTextRegion?
SymbolRef SVal::getAsLocSymbol() const {
if (const loc::MemRegionVal *X = dyn_cast<loc::MemRegionVal>(this)) {
- const MemRegion *R = X->getRegion();
+ const MemRegion *R = X->getBaseRegion();
while (R) {
// Blast through region views.
@@ -80,7 +80,6 @@
R = View->getSuperRegion();
continue;
}
-
if (const SymbolicRegion *SymR = dyn_cast<SymbolicRegion>(R))
return SymR->getSymbol();
@@ -121,6 +120,11 @@
return 0;
}
+const MemRegion *loc::MemRegionVal::getBaseRegion() const {
+ const MemRegion *R = getRegion();
+ return R ? R->getBaseRegion() : NULL;
+}
+
bool SVal::symbol_iterator::operator==(const symbol_iterator &X) const {
return itr == X.itr;
}