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| 1 ------------------------------------------------- | 1 ------------------------------------------------- |
| 2 - README file for the LTP GCOV extension (LCOV) - | 2 - README file for the LTP GCOV extension (LCOV) - |
| 3 - Last changes: 2008-11-17 - | 3 - Last changes: 2012-10-10 - |
| 4 ------------------------------------------------- | 4 ------------------------------------------------- |
| 5 | 5 |
| 6 Description | 6 Description |
| 7 ----------- | 7 ----------- |
| 8 LCOV is an extension of GCOV, a GNU tool which provides information about | 8 LCOV is an extension of GCOV, a GNU tool which provides information about |
| 9 what parts of a program are actually executed (i.e. "covered") while running | 9 what parts of a program are actually executed (i.e. "covered") while running |
| 10 a particular test case. The extension consists of a set of PERL scripts | 10 a particular test case. The extension consists of a set of Perl scripts |
| 11 which build on the textual GCOV output to implement the following enhanced | 11 which build on the textual GCOV output to implement the following enhanced |
| 12 functionality: | 12 functionality: |
| 13 | 13 |
| 14 * HTML based output: coverage rates are additionally indicated using bar | 14 * HTML based output: coverage rates are additionally indicated using bar |
| 15 graphs and specific colors. | 15 graphs and specific colors. |
| 16 | 16 |
| 17 * Support for large projects: overview pages allow quick browsing of | 17 * Support for large projects: overview pages allow quick browsing of |
| 18 coverage data by providing three levels of detail: directory view, | 18 coverage data by providing three levels of detail: directory view, |
| 19 file view and source code view. | 19 file view and source code view. |
| 20 | 20 |
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| 73 make install | 73 make install |
| 74 | 74 |
| 75 | 75 |
| 76 3. An example of how to access kernel coverage data | 76 3. An example of how to access kernel coverage data |
| 77 --------------------------------------------------- | 77 --------------------------------------------------- |
| 78 Requirements: get and install the gcov-kernel package from | 78 Requirements: get and install the gcov-kernel package from |
| 79 | 79 |
| 80 http://sourceforge.net/projects/ltp | 80 http://sourceforge.net/projects/ltp |
| 81 | 81 |
| 82 Copy the resulting gcov kernel module file to either the system wide modules | 82 Copy the resulting gcov kernel module file to either the system wide modules |
| 83 directory or the same directory as the PERL scripts. As root, do the following: | 83 directory or the same directory as the Perl scripts. As root, do the following: |
| 84 | 84 |
| 85 a) Resetting counters | 85 a) Resetting counters |
| 86 | 86 |
| 87 lcov --zerocounters | 87 lcov --zerocounters |
| 88 | 88 |
| 89 b) Capturing the current coverage state to a file | 89 b) Capturing the current coverage state to a file |
| 90 | 90 |
| 91 lcov --capture --output-file kernel.info | 91 lcov --capture --output-file kernel.info |
| 92 | 92 |
| 93 c) Getting HTML output | 93 c) Getting HTML output |
| 94 | 94 |
| 95 genhtml kernel.info | 95 genhtml kernel.info |
| 96 | 96 |
| 97 Point the web browser of your choice to the resulting index.html file. | 97 Point the web browser of your choice to the resulting index.html file. |
| 98 | 98 |
| 99 | 99 |
| 100 4. An example of how to access coverage data for a user space program | 100 4. An example of how to access coverage data for a user space program |
| 101 --------------------------------------------------------------------- | 101 --------------------------------------------------------------------- |
| 102 Requirements: compile the program in question using GCC with the options | 102 Requirements: compile the program in question using GCC with the options |
| 103 -fprofile-arcs and -ftest-coverage. Assuming the compile directory is called | 103 -fprofile-arcs and -ftest-coverage. During linking, make sure to specify |
| 104 "appdir", do the following: | 104 -lgcov or -coverage. |
| 105 |
| 106 Assuming the compile directory is called "appdir", do the following: |
| 105 | 107 |
| 106 a) Resetting counters | 108 a) Resetting counters |
| 107 | 109 |
| 108 lcov --directory appdir --zerocounters | 110 lcov --directory appdir --zerocounters |
| 109 | 111 |
| 110 b) Capturing the current coverage state to a file (works only after the | 112 b) Capturing the current coverage state to a file (works only after the |
| 111 application has been started and stopped at least once) | 113 application has been started and stopped at least once) |
| 112 | 114 |
| 113 lcov --directory appdir --capture --output-file app.info | 115 lcov --directory appdir --capture --output-file app.info |
| 114 | 116 |
| 115 c) Getting HTML output | 117 c) Getting HTML output |
| 116 | 118 |
| 117 genhtml app.info | 119 genhtml app.info |
| 118 | 120 |
| 119 Point the web browser of your choice to the resulting index.html file. | 121 Point the web browser of your choice to the resulting index.html file. |
| 120 | 122 |
| 123 Please note that independently of where the application is installed or |
| 124 from which directory it is run, the --directory statement needs to |
| 125 point to the directory in which the application was compiled. |
| 126 |
| 127 For further information on the gcc profiling mechanism, please also |
| 128 consult the gcov man page. |
| 129 |
| 121 | 130 |
| 122 5. Questions and comments | 131 5. Questions and comments |
| 123 ------------------------- | 132 ------------------------- |
| 124 See the included man pages for more information on how to use the LCOV tools. | 133 See the included man pages for more information on how to use the LCOV tools. |
| 125 | 134 |
| 126 Please email further questions or comments regarding this tool to the | 135 Please email further questions or comments regarding this tool to the |
| 127 LTP Mailing list at ltp-coverage@lists.sourceforge.net | 136 LTP Mailing list at ltp-coverage@lists.sourceforge.net |
| 128 | 137 |
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