1 files changed, 43 insertions, 0 deletions
diff --git a/lib/Analysis/UndefinedArgChecker.cpp b/lib/Analysis/UndefinedArgChecker.cpp
new file mode 100644
index 0000000..a229f55
--- /dev/null
+++ b/lib/Analysis/UndefinedArgChecker.cpp
@@ -0,0 +1,43 @@
+//===--- UndefinedArgChecker.h - Undefined arguments checker ----*- C++ -*--==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This defines BadCallChecker, a builtin check in GRExprEngine that performs
+// checks for undefined arguments.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Analysis/PathSensitive/Checkers/UndefinedArgChecker.h"
+#include "clang/Analysis/PathSensitive/BugReporter.h"
+
+using namespace clang;
+
+void *UndefinedArgChecker::getTag() {
+  static int x = 0;
+  return &x;
+}
+
+void UndefinedArgChecker::PreVisitCallExpr(CheckerContext &C, 
+                                           const CallExpr *CE){
+  for (CallExpr::const_arg_iterator I = CE->arg_begin(), E = CE->arg_end();
+       I != E; ++I) {
+    if (C.getState()->getSVal(*I).isUndef()) {
+      if (ExplodedNode *N = C.GenerateNode(CE, true)) {
+        if (!BT)
+          BT = new BugType("Pass-by-value argument in function call is "
+                           "undefined", "Logic error");
+        // Generate a report for this bug.
+        EnhancedBugReport *R = new EnhancedBugReport(*BT, BT->getName().c_str(),
+                                                     N);
+        R->addRange((*I)->getSourceRange());
+        R->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, *I);
+        C.EmitReport(R);
+      }
+    }
+  }
+}