analyzer: Fix embarrassing regression in BasicStore when invalidating struct

values passed-by-reference to unknown functions.

llvm-svn: 67519

clang/include/clang/Analysis/PathSensitive/SymbolManager.h

@@ -219,6 +219,8 @@ public:
   
   ~SymbolManager();
   
+  static bool canSymbolicate(QualType T);
+
   /// Make a unique symbol for MemRegion R according to its kind.
   SymbolRef getRegionRValueSymbol(const MemRegion* R);
   SymbolRef getConjuredSymbol(const Stmt* E, QualType T, unsigned VisitCount,

clang/lib/Analysis/BasicStore.cpp

@@ -526,6 +526,10 @@ Store BasicStoreManager::getInitialStore() {
       if (VD->getStorageClass() == VarDecl::Static)
         continue;
       
+      // Only handle simple types that we can symbolicate.
+      if (!SymbolManager::canSymbolicate(VD->getType()))
+        continue;
+
       // Initialize globals and parameters to symbolic values.
       // Initialize local variables to undefined.
       const MemRegion *R = StateMgr.getRegion(VD);

clang/lib/Analysis/SymbolManager.cpp

@@ -94,6 +94,10 @@ QualType SymbolRegionRValue::getType(ASTContext& C) const {
 
 SymbolManager::~SymbolManager() {}
 
+bool SymbolManager::canSymbolicate(QualType T) {
+  return Loc::IsLocType(T) || T->isIntegerType();  
+}
+
 void SymbolReaper::markLive(SymbolRef sym) {
   TheLiving = F.Add(TheLiving, sym);
   TheDead = F.Remove(TheDead, sym);

clang/test/Analysis/misc-ps.m

@@ -24,6 +24,19 @@ extern id NSAllocateObject(Class aClass, NSUInteger extraBytes, NSZone *zone);
 - (void)handleFailureInMethod:(SEL)selector object:(id)object file:(NSString *)fileName lineNumber:(NSInteger)line description:(NSString *)format,...;
 @end
 extern NSString * const NSConnectionReplyMode;
+typedef float CGFloat;
+typedef struct _NSPoint {
+    CGFloat x;
+    CGFloat y;
+} NSPoint;
+typedef struct _NSSize {
+    CGFloat width;
+    CGFloat height;
+} NSSize;
+typedef struct _NSRect {
+    NSPoint origin;
+    NSSize size;
+} NSRect;
 
 // Reduced test case from crash in <rdar://problem/6253157>
 @interface A @end
@@ -201,3 +214,14 @@ int rdar6695527(double x) {
   if (!x) { return 0; }
   return 1;
 }
+
+// <rdar://problem/6708148> - Test that we properly invalidate structs
+//  passed-by-reference to a function.
+void pr6708148_invalidate(NSRect *x);
+void pr6708148_use(NSRect x);
+void pr6708148_test(void) {
+  NSRect x;
+  pr6708148_invalidate(&x);
+  pr6708148_use(x); // no-warning
+}
+