How To Use llvm-cov

How To Use llvm-cov

Instrumenting your code for llvm-cov

See also: https://llvm.org/docs/CommandGuide/llvm-cov.html


- Build the code with code coverage turned on:

Compile with the -fprofile-arcs and -ftest-coverage options to add the instrumentation.


- Run your program, this creates a default.profraw file:

% ./program


- Run llvm-profdata to create a default.profdata file:

% llvm-profdata merge -sparse default.profraw -o default.profdata


- Run llvm-cov show for the module you care about:

% llvm-cov show -output-dir=output --format=html -instr-profile=./default.profdata ./program /full/path/to/source/module


- Now in the output directory you will find an index.txt file, the coverage numbers are in there.


- If you want to get coverage for a directory like player or media, you need to specify the .cpp and .hpp files:

% llvm-cov show -use-color=0 -output-dir=output -instr-profile=./default.profdata ./program /full/paht/to/source/module/*.[ch]pp


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