Cleanup title/description of "undefined branch" BugType and add some test cases for this check.

llvm-svn: 89679

clang/lib/Analysis/UndefBranchChecker.cpp

@@ -72,8 +72,7 @@ void UndefBranchChecker::VisitBranchCondition(GRBranchNodeBuilder &Builder,
     if (N) {
       N->markAsSink();
       if (!BT)
-        BT = new BuiltinBug("Undefined branch",
+        BT = new BuiltinBug("Branch condition evaluates to a garbage value");
-                 "Branch condition evaluates to an undefined or garbage value");
       EnhancedBugReport *R = new EnhancedBugReport(*BT, BT->getDescription(),N);
       R->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, 
                            Condition);

clang/test/Analysis/misc-ps.m

@@ -751,6 +751,23 @@ void test_undefined_array_subscript() {
 }
 @end
 
+//===----------------------------------------------------------------------===//
+// Test using an uninitialized value as a branch condition.
+//===----------------------------------------------------------------------===//
+
+int test_uninit_branch(void) {
+  int x;
+  if (x) // expected-warning{{Branch condition evaluates to a garbage value}}
+    return 1;
+  return 0; 
+}
+
+int test_uninit_branch_b(void) {
+  int x;
+  return x ? 1 : 0; // expected-warning{{Branch condition evaluates to a garbage value}}
+}
+
+
 //===----------------------------------------------------------------------===//
 // Test passing an undefined value in a message or function call.
 //===----------------------------------------------------------------------===//