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code coverage: Add libraries for coverage handling

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Coverage handling is divided into 3 steps:
1. Generation of  profiling data from a run of an instrumented file
   (which this patch doesn't cover)
2. Processing of profiling data, which involves indexing the profile and
   producing the data in some format that can be manipulated and
   unified.
3. Generate some reporting based on this data.

The following patch is aiming to deal with the last two steps by providing a
cli and a library for this end.
This patch adds two libraries:
1. `coverage_utils.py` which is a library for manipulating coverage
   data, it also contains a cli for the (assumed) most common operations
   that are needed in order to eventually generate coverage reporting.
2. `lcov_utils.py` - which is a library to deal with lcov format data,
   which is a textual form containing a source dependant coverage data.
   An example of such manipulation can be `coverage diff` operation
   which produces a set like difference operation. cov_a - cov_b = diff
   where diff is an lcov formated file containing coverage data for code
   cov_a that is not covered at all in cov_b.

The libraries and cli main goal is to provide a unified way to handle
coverage data in a way that can be easily scriptable and extensible.

This will pave the way for automating the coverage reporting and
processing in test.py and in jenkins piplines (for example to also
process dtest or sct coverage reporting)

Signed-off-by: Eliran Sinvani <eliransin@scylladb.com>
This commit is contained in:
Eliran Sinvani
2023-11-26 13:08:36 +02:00
parent f4b6c9074a
commit 00a55abdd6
2 changed files with 2785 additions and 0 deletions
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