How to filter files in llvm-cov code coverage report?

Question

From the llvm-cov docs:

llvm-cov show [options] -instr-profile PROFILE BIN [-object BIN,...] [[-object BIN]] [SOURCES]

The llvm-cov show command shows line by line coverage of the binaries BIN,... using the profile data PROFILE. It can optionally be filtered to only show the coverage for the files listed in SOURCES.

I'm using the following command:

xcrun llvm-cov show -instr-profile "${PROFDATA}" "${BINARY}" codecov_source_files > Coverage.report

Where codecov_source_files is a file with this line:

*Router.swift

So basically what I want is the report to only contain files with the suffix: Router.swift

But i'm getting a Coverage.report with all the classes in the project.

What am I missing?

Schoolmarm

Answer 1

It's badly worded but SOURCES is actually a list of file names, not the name of a file containing a list of filenames.

They need to be the paths to the actual source files on disk. It doesn't support wildcards or regex unfortunately.

Edit: By reading the source I have discovered that you can also list directories as SOURCES and it will recurse into them. Also there is an undocumented option -dump-collected-paths which prints the files the SOURCES match.

Tatterdemalion

Thank you for finding out SOURCES could be a folder. That really should be documented. Here is a full example of this for others that was tested with Clang 4.0. It will only show coverage for files in the src_dir folder. llvm-cov show -format=html -instr-profile=default.profdata my_exe src_dir/ > coverage.html – Afterclap

You also might want to use -output-dir=PATH instead of > coverage.html. I don't believe the latter gives you per-file outputs. – Tatterdemalion

Thank you @Timmmm, the -output-dir argument is MUCH nicer! – Afterclap

Answer 2

• you can use help to look up supported commands

$ llvm-cov show --help
$ llvm-cov report --help

• Maybe the following command is the function you want

 --ignore-filename-regex=<string> - Skip source code files with file paths that match the given regular expression

Hypochromia

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