[analyzer] Fix handling of "empty" structs with base classes

Summary:
RegionStoreManager had an optimization which replaces references to empty
structs with UnknownVal. Unfortunately, this check didn't take into account
possible field members in base classes.

To address this, I changed this test to "is empty and has no base classes". I
don't consider it worth the trouble to go through base classes and check if all
of them are empty.

Reviewers: jordan_rose

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1547

llvm-svn: 189590

1 files changed, 9 insertions, 1 deletions

diff --git a/clang/lib/StaticAnalyzer/Core/RegionStore.cpp b/clang/lib/StaticAnalyzer/Core/RegionStore.cpp
index 2a3319bc042..8bc16bd4191 100644
--- a/clang/lib/StaticAnalyzer/Core/RegionStore.cpp
+++ b/clang/lib/StaticAnalyzer/Core/RegionStore.cpp
@@ -1832,10 +1832,18 @@ NonLoc RegionStoreManager::createLazyBinding(RegionBindingsConstRef B,
   return svalBuilder.makeLazyCompoundVal(StoreRef(B.asStore(), *this), R);
 }
 
+static bool isRecordEmpty(const RecordDecl *RD) {
+  if (!RD->field_empty())
+    return false;
+  if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD))
+    return CRD->getNumBases() == 0;
+  return true;
+}
+
 SVal RegionStoreManager::getBindingForStruct(RegionBindingsConstRef B,
                                              const TypedValueRegion *R) {
   const RecordDecl *RD = R->getValueType()->castAs<RecordType>()->getDecl();
-  if (RD->field_empty())
+  if (isRecordEmpty(RD))
     return UnknownVal();
 
   return createLazyBinding(B, R);