turn unuseddefaultparams plugin off by default

add fix the method override logic

Change-Id: Ia75bc70aa1b8d26a65a4082956dc88a0fd17be9e

compilerplugins/clang/unuseddefaultparams.cxx

@@ -130,10 +130,6 @@ bool UnusedDefaultParams::VisitCallExpr(CallExpr * callExpr) {
         return true;
     }
     const FunctionDecl* functionDecl = callExpr->getDirectCallee()->getCanonicalDecl();
-    auto n = functionDecl->getNumParams();
-    if (n == 0 || !functionDecl->getParamDecl(n - 1)->hasDefaultArg()) {
-        return true;
-    }
     // method overrides don't always specify the same default params (althogh they probably should)
     // so we need to work our way up to the root method
     while (isa<CXXMethodDecl>(functionDecl)) {
@@ -142,6 +138,10 @@ bool UnusedDefaultParams::VisitCallExpr(CallExpr * callExpr) {
             break;
         functionDecl = *methodDecl->begin_overridden_methods();
     }
+    auto n = functionDecl->getNumParams();
+    if (n == 0 || !functionDecl->getParamDecl(n - 1)->hasDefaultArg()) {
+        return true;
+    }
     assert(callExpr->getNumArgs() <= n); // can be < in template code
     for (unsigned i = callExpr->getNumArgs(); i != 0;) {
         --i;
@@ -208,7 +208,7 @@ bool UnusedDefaultParams::VisitFunctionDecl( const FunctionDecl* functionDecl )
     return true;
 }
 
-loplugin::Plugin::Registration< UnusedDefaultParams > X("unuseddefaultparams", true);
+loplugin::Plugin::Registration< UnusedDefaultParams > X("unuseddefaultparams", false);
 
 }