How can Luacov generate the coverage of function and coverage of branch?

[LamberttLiu]

we use Lucov to calculate the projetc code coverage，and generate the report files, just like:

==============================================================================
Summary
==============================================================================

File                                               Hits Missed Coverage
-----------------------------------------------------------------------
/home/AGS/lualib/resty/core/base.lua        1    118    0.84%
/home/AGS/nginx/LuaSrc/common/crcmethod.lua 33   5      86.84%
/home/AGS/nginx/LuaSrc/ut/handle.lua        1    10     9.09%
/home/AGS/nginx/LuaSrc/ut/test.lua          4    8      33.33%
-----------------------------------------------------------------------
Total                                              39   141    21.67%

this coverage reporter seems just like a reporter about line coverage. So how do we get function coverage and branch coverage?