22 using namespace clang;
26 class ReturnUndefChecker :
public Checker< check::PreStmt<ReturnStmt> > {
27 mutable std::unique_ptr<BuiltinBug> BT_Undef;
28 mutable std::unique_ptr<BuiltinBug> BT_NullReference;
30 void emitUndef(CheckerContext &C,
const Expr *RetE)
const;
31 void checkReference(CheckerContext &C,
const Expr *RetE,
32 DefinedOrUnknownSVal RetVal)
const;
34 void checkPreStmt(
const ReturnStmt *RS, CheckerContext &C)
const;
38 void ReturnUndefChecker::checkPreStmt(
const ReturnStmt *RS,
39 CheckerContext &C)
const {
43 SVal RetVal =
C.getSVal(RetE);
48 if (RetVal.isUndef()) {
75 checkReference(C, RetE, RetVal.castAs<DefinedOrUnknownSVal>());
80 static void emitBug(CheckerContext &C, BuiltinBug &BT,
const Expr *RetE,
81 const Expr *TrackingE =
nullptr) {
82 ExplodedNode *N = C.generateErrorNode();
87 std::make_unique<PathSensitiveBugReport>(BT, BT.getDescription(), N);
92 C.emitReport(std::move(Report));
95 void ReturnUndefChecker::emitUndef(CheckerContext &C,
const Expr *RetE)
const {
98 new BuiltinBug(
this,
"Garbage return value",
99 "Undefined or garbage value returned to caller"));
103 void ReturnUndefChecker::checkReference(CheckerContext &C,
const Expr *RetE,
104 DefinedOrUnknownSVal RetVal)
const {
106 std::tie(StNonNull, StNull) =
C.getState()->assume(RetVal);
110 C.addTransition(StNonNull);
115 if (!BT_NullReference)
116 BT_NullReference.reset(
new BuiltinBug(
this,
"Returning null reference"));
121 void ento::registerReturnUndefChecker(CheckerManager &mgr) {
122 mgr.registerChecker<ReturnUndefChecker>();
125 bool ento::shouldRegisterReturnUndefChecker(
const CheckerManager &mgr) {