ClearCounters clears/resets all coverage counter variables in the currently running program.

WriteCounters writes coverage counter-data content for the currently running program to the writer 'w'.

WriteCountersDir writes a coverage counter-data file for the currently running program to the directory specified in 'dir'.

WriteMeta writes the meta-data content (the payload that would normally be emitted to a meta-data file) for the currently running program to the writer 'w'.

WriteMetaDir writes a coverage meta-data file for the currently running program to the directory specified in 'dir'.