introduction to gcov and lcov

1. Using gcov and lcov Magus Chen maguschen@hotmail.com http://magustest.com/blog/

2. Agenda gcov lcov How to apply gcov on ads Using lcov generate report Example 2

3. Introduction to gcov A test coverage program Works only on code compiled with GCC Collect code coverage data and generate plain text coverage report 3

4. Introduction to lcov LCOV is a graphical front-end for GCC's coverage testing tool gcov. It collects gcov data for multiple source files and creates HTML pages containing the source code annotated with coverage information. It also adds overview pages for easy navigation within the file structure. LCOV supports statement, function and branch coverage measurement. 4

5. How to apply gcov on ads Build adserver with option “--coverage” This option is used to compile and link code instrumented for coverage analysis. The option is a synonym for -fprofile-arcs-ftest-coverage (when compiling) and -lgcov (when linking). 5

6. How to apply gcov on ads Copy ads binary to your own environment Export two envGCOV_PREFIX and GCOV_PREFIX_STRIP Run ads Send request To generate code coverage data, exit the program normally (using kill, not kill -9) Some .gcda file is generated 6

7. How to generate html report Copy all source files and .gcno files from build server to your own environment Copy all .gcda file to your own environment lcov -t 'Adserver regression' -o ads_test.info -c -d . -t title -o output file name -c capture coverage data -d use data files in DIR 7

8. How to generate html report genhtml -o result ads_test.info -o output folder of the all html contents ads_test.info INFO FILE name 8

9. How to view the HTML report Apache httpd /etc/init.d/httpd start Copy or link the result folder under /var/www/html/ Lighttpd /usr/local/sbin/lighttpd -f lighttpd_jchen.conf Copy or link the result folder under server.document-root 9

10. Example 10

11. Q & A 11

12. Thank you