Add "KnownSVal" to represent SVals that cannot be UnknownSVal.

This provides a few sundry cleanups, and allows us to provide
a compile-time check for a case that was a runtime assertion.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175987 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 1 deletions

diff --git a/include/clang/StaticAnalyzer/Core/PathSensitive/SVals.h b/include/clang/StaticAnalyzer/Core/PathSensitive/SVals.h
index 31d02f51ea..03e84447e7 100644
--- a/include/clang/StaticAnalyzer/Core/PathSensitive/SVals.h
+++ b/include/clang/StaticAnalyzer/Core/PathSensitive/SVals.h
@@ -219,7 +219,7 @@ public:
   
 private:
   friend class SVal;
-  static bool isKind(const SVal& V) {
+  static bool isKind(const SVal &V) {
     return V.getBaseKind() == UnknownKind;
   }
 };
@@ -242,6 +242,19 @@ private:
   }
 };
 
+
+/// \brief Represents an SVal that is guaranteed to not be UnknownVal.
+class KnownSVal : public SVal {
+  KnownSVal() {}
+  friend class SVal;
+  static bool isKind(const SVal &V) {
+    return !V.isUnknown();
+  }
+public:
+  KnownSVal(const DefinedSVal &V) : SVal(V) {}
+  KnownSVal(const UndefinedVal &V) : SVal(V) {}
+};
+
 class NonLoc : public DefinedSVal {
 protected:
   NonLoc() {}