Like an X-ray machine, gcov peers into your code and reports on its inner workings. And gcov is easy to use: simply compile your code with gcc. As per Wikipedia, Gcov is a source code coverage analysis and statement-by- statement profiling tool. Gcov generates exact Gcov comes as a standard utility with GNU CC Suite (GCC) . Good and detailed tutorial on using gcov. Reply. 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 .

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By using this site, turorial agree to the Terms tytorial Use and Privacy Policy. Notify me of new comments via email. Each function is preceded with a line showing the number of times the function is called, number of times it returns and the percentage of function blocks that were executed.

This option is useful when building in a separate directory, and the pathname to the source directory is not wanted when determining the output file names. When using gcovyou must first compile your program with two special GCC options: Any line that was not executed will have in place of the execution count.


Tuyorial type of summary is helpful to determine which tests to run after source code has been changed in the kernel. As we have seen so far, running the program to be profiled will cause profile output to be generated. If this option is not supplied, it defaults to the current directory. LTP uses gcov to determine the test coverage that its suites provide.

Output gcov file in an easy-to-parse JSON intermediate format which does not require source code for generation.

Linux Test Project – Coverage » lcov

For example, if your program is called tmp. You are commenting using your Facebook account. Write branch frequencies to the output ttuorial, and write branch summary info to the standard output.

November 7, at The data in the. The kernel coverage map on the site provides coverage by kernel source code subdirectories. Next you need to have lcov.

In general, though, the lowest numbered branch or call will correspond to the leftmost construct on the source line. For example, the attr.

If a standard filesystem is present, the above method should work. A block can be a set of simple execution statements or a logical branch.

What is coverage?

Thanks for this blog on code coverage. Use colors for lines of code that have zero coverage.

For a call, if it was executed at least once, then a percentage indicating the number of times the call returned divided by the number of times the call was uttorial will be printed.


The option -ftest-coverage adds instructions for counting the number of times individual lines are executed, while -fprofile-arcs incorporates instrumentation code for each branch of the program. It then adds in the new execution counts tutorlal finally writes the data to the file. Fill in your details below or click an icon to log in: In other cases, the test gdov itself may have to be expanded to be more thorough. All articles with specifically marked weasel-worded phrases Articles with specifically marked weasel-worded phrases from August July 24, at 5: These options cause the compiler to insert additional code into the object files.

From Wikipedia, the free encyclopedia.

Using the GNU Compiler Collection (GCC): Invoking Gcov

Note that GCC can completely remove the bodies of functions tutoria, are not needed — for instance if they are inlined everywhere. For example, if the header file x. The ideal test code should logically call all the functions and execute all statements in the blocks.

Lcov is a graphical front-end for gcov.