Linux code coverage Detection

The GCC/g ++ comes with the gcov tool to automatically generate an executionCodeGcda. You only need to compile the macro-fprofile-arcs-ftest-coverage to generate the gcno file.

Specific information is visible

Http://gcc.gnu.org/onlinedocs/gcc-3.3.6/gcc/Gcov-Intro.html#Gcov-Intro

This section describes how to use the file generated by gcov to generate a more intuitive web page tool lcov.Http://ltp.sourceforge.net/coverage/lcov.phpDownload this tool. Let's take a simple example to see how to use this tool.

1. Install lcov

# Tar-zxvf lcov-1.10.tar.gz

# Make install

In this way, we can have two tools, lcov genhtml, which can be used to directly run the command to see the help information-help you understand ..

 

2. Test the CPP File

 
# Include "stdio. H "# include" string. H "int test (int I) {if (I> 0) {printf (" IU> 0 \ n ");} else {printf ("I <0 \ n") ;}return 0 ;}int main () {test (1); Return 0 ;}
 

A file named test. gcno is generated.

3. RunProgram

./OK

Generate a gcda File

 

4. Execute lcov to generate a file

Lcov-D.-t OK-O coverage.info-B.-C

-D directory with execution Program (OK) after-O indicates file generation

Since then, the conditions for generating web pages have been fully met.

5. Generate a webpage

Genhtml-o Result coverage.info

-O path + conversion information

The page information is as follows: You can clearly see which branches of the current Code have not been reached.

Summary:

Code coverage helps us perform unit tests to a certain extent. We can perform the above tests on some test cases to see if the test cases can well cover all the branches of the Code, further improve code Stability.