void CallAndMessageChecker::checkPreObjCMessage(const ObjCMethodCall &msg, CheckerContext &C) const { SVal recVal = msg.getReceiverSVal(); if (recVal.isUndef()) { if (ExplodedNode *N = C.generateSink()) { BugType *BT = 0; switch (msg.getMessageKind()) { case OCM_Message: if (!BT_msg_undef) BT_msg_undef.reset(new BuiltinBug("Receiver in message expression " "is an uninitialized value")); BT = BT_msg_undef.get(); break; case OCM_PropertyAccess: if (!BT_objc_prop_undef) BT_objc_prop_undef.reset(new BuiltinBug("Property access on an " "uninitialized object " "pointer")); BT = BT_objc_prop_undef.get(); break; case OCM_Subscript: if (!BT_objc_subscript_undef) BT_objc_subscript_undef.reset(new BuiltinBug("Subscript access on an " "uninitialized object " "pointer")); BT = BT_objc_subscript_undef.get(); break; } assert(BT && "Unknown message kind."); BugReport *R = new BugReport(*BT, BT->getName(), N); const ObjCMessageExpr *ME = msg.getOriginExpr(); R->addRange(ME->getReceiverRange()); // FIXME: getTrackNullOrUndefValueVisitor can't handle "super" yet. if (const Expr *ReceiverE = ME->getInstanceReceiver()) R->addVisitor(bugreporter::getTrackNullOrUndefValueVisitor(N, ReceiverE, R)); C.EmitReport(R); } return; } else { // Bifurcate the state into nil and non-nil ones. DefinedOrUnknownSVal receiverVal = cast<DefinedOrUnknownSVal>(recVal); ProgramStateRef state = C.getState(); ProgramStateRef notNilState, nilState; llvm::tie(notNilState, nilState) = state->assume(receiverVal); // Handle receiver must be nil. if (nilState && !notNilState) { HandleNilReceiver(C, state, msg); return; } } }
void CallAndMessageChecker::checkPreObjCMessage(ObjCMessage msg, CheckerContext &C) const { ProgramStateRef state = C.getState(); const LocationContext *LCtx = C.getLocationContext(); // FIXME: Handle 'super'? if (const Expr *receiver = msg.getInstanceReceiver()) { SVal recVal = state->getSVal(receiver, LCtx); if (recVal.isUndef()) { if (ExplodedNode *N = C.generateSink()) { BugType *BT = 0; if (msg.isPureMessageExpr()) { if (!BT_msg_undef) BT_msg_undef.reset(new BuiltinBug("Receiver in message expression " "is an uninitialized value")); BT = BT_msg_undef.get(); } else { if (!BT_objc_prop_undef) BT_objc_prop_undef.reset(new BuiltinBug("Property access on an " "uninitialized object pointer")); BT = BT_objc_prop_undef.get(); } BugReport *R = new BugReport(*BT, BT->getName(), N); R->addRange(receiver->getSourceRange()); R->addVisitor(bugreporter::getTrackNullOrUndefValueVisitor(N, receiver, R)); C.EmitReport(R); } return; } else { // Bifurcate the state into nil and non-nil ones. DefinedOrUnknownSVal receiverVal = cast<DefinedOrUnknownSVal>(recVal); ProgramStateRef notNilState, nilState; llvm::tie(notNilState, nilState) = state->assume(receiverVal); // Handle receiver must be nil. if (nilState && !notNilState) { HandleNilReceiver(C, state, msg); return; } } } const char *bugDesc = msg.isPropertySetter() ? "Argument for property setter is an uninitialized value" : "Argument in message expression is an uninitialized value"; // Check for any arguments that are uninitialized/undefined. PreVisitProcessArgs(C, CallOrObjCMessage(msg, state, LCtx), bugDesc, BT_msg_arg); }
void CallAndMessageChecker::checkPreObjCMessage(const ObjCMethodCall &msg, CheckerContext &C) const { SVal recVal = msg.getReceiverSVal(); if (recVal.isUndef()) { if (ExplodedNode *N = C.generateErrorNode()) { BugType *BT = nullptr; switch (msg.getMessageKind()) { case OCM_Message: if (!BT_msg_undef) BT_msg_undef.reset(new BuiltinBug(this, "Receiver in message expression " "is an uninitialized value")); BT = BT_msg_undef.get(); break; case OCM_PropertyAccess: if (!BT_objc_prop_undef) BT_objc_prop_undef.reset(new BuiltinBug( this, "Property access on an uninitialized object pointer")); BT = BT_objc_prop_undef.get(); break; case OCM_Subscript: if (!BT_objc_subscript_undef) BT_objc_subscript_undef.reset(new BuiltinBug( this, "Subscript access on an uninitialized object pointer")); BT = BT_objc_subscript_undef.get(); break; } assert(BT && "Unknown message kind."); auto R = llvm::make_unique<BugReport>(*BT, BT->getName(), N); const ObjCMessageExpr *ME = msg.getOriginExpr(); R->addRange(ME->getReceiverRange()); // FIXME: getTrackNullOrUndefValueVisitor can't handle "super" yet. if (const Expr *ReceiverE = ME->getInstanceReceiver()) bugreporter::trackExpressionValue(N, ReceiverE, *R); C.emitReport(std::move(R)); } return; } }