USING GCOV AND LCOV

Magus Chenmaguschen@hotmail.com

http://magustest.com/blog/

Company Logo

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Agenda

• gcov• lcov• How to apply gcov on ads• Using lcov generate report• Example

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Introduction to gcov

• A test coverage program

• Works only on code compiled with GCC

• Collect code coverage data and generate

plain text coverage report

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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.

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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).

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How to apply gcov on ads

• Copy ads binary to your own environment

– Export two env GCOV_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

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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

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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

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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

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Example

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Q & A

Thank you