Check in LLVM r95781.
diff --git a/lib/Checker/UndefinedAssignmentChecker.cpp b/lib/Checker/UndefinedAssignmentChecker.cpp
new file mode 100644
index 0000000..7c33c1d
--- /dev/null
+++ b/lib/Checker/UndefinedAssignmentChecker.cpp
@@ -0,0 +1,79 @@
+//===--- UndefinedAssignmentChecker.h ---------------------------*- C++ -*--==//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This defines UndefinedAssginmentChecker, a builtin check in GRExprEngine that
+// checks for assigning undefined values.
+//
+//===----------------------------------------------------------------------===//
+
+#include "GRExprEngineInternalChecks.h"
+#include "clang/Checker/PathSensitive/CheckerVisitor.h"
+#include "clang/Checker/BugReporter/BugReporter.h"
+
+using namespace clang;
+
+namespace {
+class UndefinedAssignmentChecker
+ : public CheckerVisitor<UndefinedAssignmentChecker> {
+ BugType *BT;
+public:
+ UndefinedAssignmentChecker() : BT(0) {}
+ static void *getTag();
+ virtual void PreVisitBind(CheckerContext &C, const Stmt *AssignE,
+ const Stmt *StoreE, SVal location,
+ SVal val);
+};
+}
+
+void clang::RegisterUndefinedAssignmentChecker(GRExprEngine &Eng){
+ Eng.registerCheck(new UndefinedAssignmentChecker());
+}
+
+void *UndefinedAssignmentChecker::getTag() {
+ static int x = 0;
+ return &x;
+}
+
+void UndefinedAssignmentChecker::PreVisitBind(CheckerContext &C,
+ const Stmt *AssignE,
+ const Stmt *StoreE,
+ SVal location,
+ SVal val) {
+ if (!val.isUndef())
+ return;
+
+ ExplodedNode *N = C.GenerateSink();
+
+ if (!N)
+ return;
+
+ if (!BT)
+ BT = new BuiltinBug("Assigned value is garbage or undefined");
+
+ // Generate a report for this bug.
+ EnhancedBugReport *R = new EnhancedBugReport(*BT, BT->getName(), N);
+
+ if (AssignE) {
+ const Expr *ex = 0;
+
+ if (const BinaryOperator *B = dyn_cast<BinaryOperator>(AssignE))
+ ex = B->getRHS();
+ else if (const DeclStmt *DS = dyn_cast<DeclStmt>(AssignE)) {
+ const VarDecl* VD = dyn_cast<VarDecl>(DS->getSingleDecl());
+ ex = VD->getInit();
+ }
+ if (ex) {
+ R->addRange(ex->getSourceRange());
+ R->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, ex);
+ }
+ }
+
+ C.EmitReport(R);
+}
+