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Issue 23189008: Upgrades lcov to 1.10, removes lcov-1.9 (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Re-adds UNKNOWN suppression Created 7 years, 4 months ago
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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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