Excluding code from coverage stats in Xcode 7

问题:

I have enabled code coverage statistics in Xcode 7.0 and Objective C (like this) and it's working well.

Is it possible to mark some source lines so that they are ignored by the coverage report? If I was using lcov then I could use LCOV_EXCL_START and LCOV_EXCL_END markers (as in How to tell lcov to ignore lines in the source files) but Xcode doesn't recognize those.

Does Xcode have an alternative mechanism for doing this?

回答1:

Xcode7 and later (based on some forum posts), the coverage system uses LLVM's coverage generation and reporting mechanisms, the format for which is detailed at http://llvm.org/docs/CoverageMappingFormat.html. As of Xcode 9, this format does not support any means of exclusion of lines (or other structures).

The resulting mapping is exported into a consumable format (txt or html) by llvm-cov, which also doesn't really have much in the way of exclusion mechanisms. llvm-cov does have some simple thresholding for only reporting on "greater than" or "less than" coverage for both lines and regions, but I suspect that's not entirely what you're after based on the question above.