[analyzer] Invalidation checker: move the "missing implementation" check

The missing definition check should be in the same category as the
missing ivar validation - in this case, the intent is to invalidate in
the given class, as described in the declaration, but the implementation
does not perform the invalidation. Whereas the MissingInvalidationMethod
checker checks the cases where the method intention is not to
invalidate. The second checker has potential to have a much higher false
positive rate.

llvm-svn: 174787

1 files changed, 13 insertions, 12 deletions

diff --git a/clang/lib/StaticAnalyzer/Checkers/IvarInvalidationChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/IvarInvalidationChecker.cpp
index 6262cb8ef9d..0389cc551b3 100644
--- a/clang/lib/StaticAnalyzer/Checkers/IvarInvalidationChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/IvarInvalidationChecker.cpp
@@ -51,8 +51,7 @@ struct ChecksFilter {
   DefaultBool check_InstanceVariableInvalidation;
 };
 
-class IvarInvalidationCheckerImpl :
-  public Checker<check::ASTDecl<ObjCImplementationDecl> > {
+class IvarInvalidationCheckerImpl {
 
   typedef llvm::SmallSetVector<const ObjCMethodDecl*, 2> MethodSet;
   typedef llvm::DenseMap<const ObjCMethodDecl*,
@@ -471,12 +470,20 @@ visit(const ObjCImplementationDecl *ImplD) const {
   containsInvalidationMethod(InterfaceD, Info, /*LookForPartial*/ false);
 
   // Report an error in case none of the invalidation methods are declared.
-  if (!Info.needsInvalidation() && Filter.check_MissingInvalidationMethod) {
-    reportNoInvalidationMethod(FirstIvarDecl, IvarToPopertyMap, InterfaceD,
-                               /*MissingDeclaration*/ true);
+  if (!Info.needsInvalidation()) {
+    if (Filter.check_MissingInvalidationMethod)
+      reportNoInvalidationMethod(FirstIvarDecl, IvarToPopertyMap, InterfaceD,
+                                 /*MissingDeclaration*/ true);
+    // If there are no invalidation methods, there is no ivar validation work
+    // to be done.
     return;
   }
 
+  // Only check if Ivars are invalidated when InstanceVariableInvalidation
+  // has been requested.
+  if (!Filter.check_InstanceVariableInvalidation)
+    return;
+
   // Check that all ivars are invalidated by the invalidation methods.
   bool AtImplementationContainsAtLeastOneInvalidationMethod = false;
   for (MethodSet::iterator I = Info.InvalidationMethods.begin(),
@@ -489,11 +496,6 @@ visit(const ObjCImplementationDecl *ImplD) const {
     if (D && D->hasBody()) {
       AtImplementationContainsAtLeastOneInvalidationMethod = true;
 
-      // Only check if Ivars are invalidated when InstanceVariableInvalidation
-      // has been requested.
-      if (!Filter.check_InstanceVariableInvalidation)
-        break;
-
       // Get a copy of ivars needing invalidation.
       IvarSet IvarsI = Ivars;
 
@@ -517,8 +519,7 @@ visit(const ObjCImplementationDecl *ImplD) const {
   }
 
   // Report an error in case none of the invalidation methods are implemented.
-  if (!AtImplementationContainsAtLeastOneInvalidationMethod &&
-      Filter.check_MissingInvalidationMethod)
+  if (!AtImplementationContainsAtLeastOneInvalidationMethod)
     reportNoInvalidationMethod(FirstIvarDecl, IvarToPopertyMap, InterfaceD,
                                /*MissingDeclaration*/ false);
 }