About the App. App name: gcovr. App description: Reports from gcov test coverage program. App website: Install the App. Press Command+Space and type Terminal and press enter/return key.
Run in Terminal app: ruby -e '$(curl -fsSL /dev/null and press enter/return key. If the screen prompts you to enter a password, please enter your Mac's user password to continue. When you type the password, it won't be displayed on screen, but the system would accept it.
So just type your password and press ENTER/RETURN key. Then wait for the command to finish. Run: brew install gcovr Done! You can now use gcovr.
Gcov options files gcov accepts the following options: -a -all-blocks Write individual execution counts for every basic block. Normally gcov outputs execution counts only for the main blocks of a line. With this option you can determine if blocks within a single line are not being executed.b -branch-probabilities Write branch frequencies to the output file, and write branch summary info to the standard output. This option allows you to see how often each branch in your program was taken. Unconditional branches will not be shown, unless the -u option is given.c -branch-counts Write branch frequencies as the number of branches taken, rather than the percentage of branches taken.d -display-progress Display the progress on the standard output.f -function-summaries Output summaries for each function in addition to the file level summary.h -help Display help about using gcov (on the standard output), and exit without doing any further processing.i -json-format Output gcov file in an easy-to-parse JSON intermediate format which does not require source code for generation. The JSON file is compressed with gzip compression algorithm and the files have.gcov.json.gz extension. Structure of the JSON is following.
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Executioncount: linenumber: source line text Additional block information may succeed each line, when requested by command line option. The executioncount is ‘ -’ for lines containing no code. Unexecuted lines are marked ‘ #####’ or ‘ ’, depending on whether they are reachable by non-exceptional paths or only exceptional paths such as C exception handlers, respectively.
Given the ‘ -a’ option, unexecuted blocks are marked ‘ $$$$$’ or ‘%%%%%’, depending on whether a basic block is reachable via non-exceptional or exceptional paths. Executed basic blocks having a statement with zero executioncount end with ‘.’ character and are colored with magenta color with the -k option. This functionality is not supported in Ada.
Note that GCC can completely remove the bodies of functions that are not needed – for instance if they are inlined everywhere. Such functions are marked with ‘ -’, which can be confusing. Use the -fkeep-inline-functions and -fkeep-static-functions options to retain these functions and allow gcov to properly show their executioncount. Some lines of information at the start have linenumber of zero. These preamble lines are of the form. Tag information The information is human readable, but designed to be simple enough for machine parsing too.
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When printing percentages, 0% and 100% are only printed when the values are exactly 0% and 100% respectively. Other values which would conventionally be rounded to 0% or 100% are instead printed as the nearest non-boundary value. When using gcov, you must first compile your program with two special GCC options: ‘ -fprofile-arcs -ftest-coverage’. This tells the compiler to generate additional information needed by gcov (basically a flow graph of the program) and also includes additional code in the object files for generating the extra profiling information needed by gcov.
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These additional files are placed in the directory where the object file is located. Running the program will cause profile output to be generated.
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For each source file compiled with -fprofile-arcs, an accompanying.gcda file will be placed in the object file directory. Running gcov with your program’s source file names as arguments will now produce a listing of the code along with frequency of execution for each line. For example, if your program is called tmp.cpp, this is what you see when you use the basic gcov facility.