Enhance analyzer reasoning about sending messages to nil. A nil receiver returns 0 for scalars of size <= sizeof(void*).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68629 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/SVals.cpp b/lib/Analysis/SVals.cpp
index b642857..c5900b3 100644
--- a/lib/Analysis/SVals.cpp
+++ b/lib/Analysis/SVals.cpp
@@ -202,6 +202,22 @@
}
//===----------------------------------------------------------------------===//
+// Utility methods for constructing SVals.
+//===----------------------------------------------------------------------===//
+
+SVal SVal::MakeZero(BasicValueFactory &BasicVals, QualType T) {
+ if (Loc::IsLocType(T))
+ return Loc::MakeNull(BasicVals);
+
+ if (T->isIntegerType())
+ return NonLoc::MakeVal(BasicVals, 0, T);
+
+ // FIXME: Handle floats.
+ // FIXME: Handle structs.
+ return UnknownVal();
+}
+
+//===----------------------------------------------------------------------===//
// Utility methods for constructing Non-Locs.
//===----------------------------------------------------------------------===//
@@ -314,6 +330,10 @@
Loc Loc::MakeVal(SymbolRef sym) { return loc::SymbolVal(sym); }
+Loc Loc::MakeNull(BasicValueFactory &BasicVals) {
+ return loc::ConcreteInt(BasicVals.getZeroWithPtrWidth());
+}
+
//===----------------------------------------------------------------------===//
// Pretty-Printing.
//===----------------------------------------------------------------------===//