145   enum class PreambleResult { NoChange, WroteMetadata, InvalidBuffer };  enum
146   PreambleResult recordPreamble(uint64_t TSC,  in recordPreamble()
155         return PreambleResult::InvalidBuffer;  in recordPreamble()
158       return PreambleResult::WroteMetadata;  in recordPreamble()
172         return PreambleResult::InvalidBuffer;  in recordPreamble()
175       return PreambleResult::WroteMetadata;  in recordPreamble()
178     return PreambleResult::NoChange;  in recordPreamble()
251     if (PreambleStatus == PreambleResult::InvalidBuffer)  in functionEnter()
254     if (PreambleStatus == PreambleResult::WroteMetadata) {  in functionEnter()
277     if (PreambleStatus == PreambleResult::InvalidBuffer)  in functionTailExit()
280     if (PreambleStatus == PreambleResult::NoChange &&  in functionTailExit()
297         recordPreamble(TSC, CPU) == PreambleResult::InvalidBuffer)  in functionEnterArg()
317     if (PreambleStatus == PreambleResult::InvalidBuffer)  in functionExit()
320     if (PreambleStatus == PreambleResult::NoChange &&  in functionExit()
337         recordPreamble(TSC, CPU) == PreambleResult::InvalidBuffer)  in customEvent()
351         recordPreamble(TSC, CPU) == PreambleResult::InvalidBuffer)  in typedEvent()