There is only a single to line in the entire format, and it is always the first information line.
The data fields in a total line are:
to
<# unused blocks> <# blocks> <# unused lines> \
<# lines> <# unused funcs> <#
funcs> \
<# files>
<# dirs>
The <# unused blocks> field indicates the number of unused basic blocks for all source files in any of the test sessions.
The <# blocks> field indicates the total number of basic blocks in the source files, including both used and unused blocks.
The <# unused lines> field indicates the total number of lines that were not used in any of the test sessions, summed across all the source files.
The <# lines> field indicates the total number of source lines in the source files, including both used and unused lines.
The <# unused funcs> field indicates the total number of functions that were not used in any of the test sessions, summed across all the source files.
The <# funcs> field indicates the total number of functions in all the source files.
The <# files> field indicates the total number of source files in all the directories.
The <# dirs> field indicates the total number of directories in the data.