1559   llvm::BasicBlock *NullBB;  member
1560   NullReturnState() : NullBB(nullptr) {}  in NullReturnState()
1565     NullBB = CGF.createBasicBlock("msgSend.null-receiver");  in init()
1573     CGF.Builder.CreateCondBr(isNull, NullBB, callBB);  in init()
1585     if (!NullBB) return result;  in complete()
1599     CGF.EmitBlock(NullBB);  in complete()
1617     assert(CGF.Builder.GetInsertBlock() == NullBB);  in complete()
1638       phi->addIncoming(null, NullBB);  in complete()
1664     real->addIncoming(scalarZero, NullBB);  in complete()
1667     imag->addIncoming(scalarZero, NullBB);  in complete()
1901         if (!nullReturn.NullBB)  in EmitMessageSend()
6555         if (!nullReturn.NullBB)  in EmitVTableMessageSend()