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geninfo(1) User Manuals geninfo(1) NAME geninfo - Generate tracefiles from .da files SYNOPSIS geninfo [-h|--help] [-v|--version] [-q|--quiet] [-i|--initial] [-t|--test-name test-name] [-o|--output-filename filename] [-f|--follow] [-b|--base-directory directory] [--checksum] [--no-checksum] [--compat-libtool] [--no-compat-libtool] [--gcov-tool tool] [--ignore-errors errors] [--no-recursion] directory [--external] [--no-external] [--config-file config-file] [--no-markers] [--derive-func-data] [--compat mode=on|off|auto] [--rc keyword=value] [--include pattern] [--exclude pattern] DESCRIPTION geninfo converts all GCOV coverage data files found in directory into tracefiles, which the genhtml tool can convert to HTML output. Unless the --output-filename option is specified, geninfo writes its output to one file per .da file, the name of which is generated by sim- ply appending ".info" to the respective .da file name. Note that the current user needs write access to both directory as well as to the original source code location. This is necessary because some temporary files have to be created there during the conversion process. Note also that geninfo is called from within lcov, so that there is usually no need to call it directly. Exclusion markers To exclude specific lines of code from a tracefile, you can add exclu- sion markers to the source code. Additionally you can exclude specific branches from branch coverage without excluding the involved lines from line and function coverage. Exclusion markers are keywords which can for example be added in the form of a comment. See lcovrc(5) how to override some of them. The following markers are recognized by geninfo: LCOV_EXCL_LINE Lines containing this marker will be excluded. LCOV_EXCL_START Marks the beginning of an excluded section. The current line is part of this section. LCOV_EXCL_STOP Marks the end of an excluded section. The current line not part of this section. LCOV_EXCL_BR_LINE Lines containing this marker will be excluded from branch cover- age. LCOV_EXCL_BR_START Marks the beginning of a section which is excluded from branch coverage. The current line is part of this section. LCOV_EXCL_BR_STOP Marks the end of a section which is excluded from branch cover- age. The current line not part of this section. LCOV_EXCL_EXCEPTION_BR_LINE Lines containing this marker will be excluded from exception branch coverage: Exception branches will be ignored, but non-ex- ception branches will not be affected. LCOV_EXCL_EXCEPTION_BR_START Marks the beginning of a section which is excluded from excep- tion branch coverage. The current line is part of this section. LCOV_EXCL_EXCEPTION_BR_STOP Marks the end of a section which is excluded from exception branch coverage. The current line not part of this section. OPTIONS -b directory --base-directory directory Use directory as base directory for relative paths. Use this option to specify the base directory of a build-envi- ronment when geninfo produces error messages like: ERROR: could not read source file /home/user/project/sub- dir1/subdir2/subdir1/subdir2/file.c In this example, use /home/user/project as base directory. This option is required when using geninfo on projects built with libtool or similar build environments that work with a base directory, i.e. environments, where the current working direc- tory when invoking the compiler is not the same directory in which the source code file is located. Note that this option will not work in environments where multi- ple base directories are used. In that case use configuration file setting geninfo_auto_base=1 (see lcovrc(5)). --checksum --no-checksum Specify whether to generate checksum data when writing trace- files. Use --checksum to enable checksum generation or --no-checksum to disable it. Checksum generation is disabled by default. When checksum generation is enabled, a checksum will be gener- ated for each source code line and stored along with the cover- age data. This checksum will be used to prevent attempts to com- bine coverage data from different source code versions. If you don't work with different source code versions, disable this option to speed up coverage data processing and to reduce the size of tracefiles. --compat mode=value[,mode=value,...] Set compatibility mode. Use --compat to specify that geninfo should enable one or more compatibility modes when capturing coverage data. You can pro- vide a comma-separated list of mode=value pairs to specify the values for multiple modes. Valid values are: on Enable compatibility mode. off Disable compatibility mode. auto Apply auto-detection to determine if compatibility mode is required. Note that auto-detection is not available for all compatibility modes. If no value is specified, 'on' is assumed as default value. Valid modes are: libtool Enable this mode if you are capturing coverage data for a project that was built using the libtool mechanism. See also --compat-libtool. The default value for this setting is 'on'. hammer Enable this mode if you are capturing coverage data for a project that was built using a version of GCC 3.3 that contains a modification (hammer patch) of later GCC ver- sions. You can identify a modified GCC 3.3 by checking the build directory of your project for files ending in the extension '.bbg'. Unmodified versions of GCC 3.3 name these files '.bb'. The default value for this setting is 'auto'. split_crc Enable this mode if you are capturing coverage data for a project that was built using a version of GCC 4.6 that contains a modification (split function checksums) of later GCC versions. Typical error messages when running geninfo on coverage data produced by such GCC versions are 'out of memory' and 'reached unexpected end of file'. The default value for this setting is 'auto' --compat-libtool --no-compat-libtool Specify whether to enable libtool compatibility mode. Use --compat-libtool to enable libtool compatibility mode or --no-compat-libtool to disable it. The libtool compatibility mode is enabled by default. When libtool compatibility mode is enabled, geninfo will assume that the source code relating to a .da file located in a direc- tory named ".libs" can be found in its parent directory. If you have directories named ".libs" in your build environment but don't use libtool, disable this option to prevent problems when capturing coverage data. --config-file config-file Specify a configuration file to use. When this option is specified, neither the system-wide configu- ration file /etc/lcovrc, nor the per-user configuration file ~/.lcovrc is read. This option may be useful when there is a need to run several instances of geninfo with different configuration file options in parallel. --derive-func-data Calculate function coverage data from line coverage data. Use this option to collect function coverage data, even if the version of the gcov tool installed on the test system does not provide this data. lcov will instead derive function coverage data from line coverage data and information about which lines belong to a function. --exclude pattern Exclude source files matching pattern. Use this switch if you want to exclude coverage data for a par- ticular set of source files matching any of the given patterns. Multiple patterns can be specified by using multiple --exclude command line switches. The patterns will be interpreted as shell wildcard patterns (note that they may need to be escaped accord- ingly to prevent the shell from expanding them first). Note: The pattern must be specified to match the absolute path of each source file. Can be combined with the --include command line switch. If a given file matches both the include pattern and the exclude pat- tern, the exclude pattern will take precedence. --external --no-external Specify whether to capture coverage data for external source files. External source files are files which are not located in one of the directories specified by --directory or --base-directory. Use --external to include external source files while capturing coverage data or --no-external to ignore this data. Data for external source files is included by default. -f --follow Follow links when searching .da files. --gcov-tool tool Specify the location of the gcov tool. -h --help Print a short help text, then exit. --include pattern Include source files matching pattern. Use this switch if you want to include coverage data for only a particular set of source files matching any of the given pat- terns. Multiple patterns can be specified by using multiple --include command line switches. The patterns will be inter- preted as shell wildcard patterns (note that they may need to be escaped accordingly to prevent the shell from expanding them first). Note: The pattern must be specified to match the absolute path of each source file. --ignore-errors errors Specify a list of errors after which to continue processing. Use this option to specify a list of one or more classes of er- rors after which geninfo should continue processing instead of aborting. errors can be a comma-separated list of the following keywords: gcov: the gcov tool returned with a non-zero return code. source: the source code file for a data set could not be found. -i --initial Capture initial zero coverage data. Run geninfo with this option on the directories containing .bb, .bbg or .gcno files before running any test case. The result is a "baseline" coverage data file that contains zero coverage for every instrumented line and function. Combine this data file (using lcov -a) with coverage data files captured after a test run to ensure that the percentage of total lines covered is cor- rect even when not all object code files were loaded during the test. Note: currently, the --initial option does not generate branch coverage information. --no-markers Use this option if you want to get coverage data without regard to exclusion markers in the source code file. --no-recursion Use this option if you want to get coverage data for the speci- fied directory only without processing subdirectories. -o output-filename --output-filename output-filename Write all data to output-filename. If you want to have all data written to a single file (for eas- ier handling), use this option to specify the respective file- name. By default, one tracefile will be created for each processed .da file. -q --quiet Do not print progress messages. Suppresses all informational progress output. When this switch is enabled, only error or warning messages are printed. --rc keyword=value Override a configuration directive. Use this option to specify a keyword=value statement which over- rides the corresponding configuration statement in the lcovrc configuration file. You can specify this option more than once to override multiple configuration statements. See lcovrc(5) for a list of available keywords and their meaning. -t testname --test-name testname Use test case name testname for resulting data. Valid test case names can consist of letters, decimal digits and the underscore character ('_'). This proves useful when data from several test cases is merged (i.e. by simply concatenating the respective tracefiles) in which case a test name can be used to differentiate between data from each test case. -v --version Print version number, then exit. FILES /etc/lcovrc The system-wide configuration file. ~/.lcovrc The per-user configuration file. Following is a quick description of the tracefile format as used by genhtml, geninfo and lcov. A tracefile is made up of several human-readable lines of text, divided into sections. If available, a tracefile begins with the testname which is stored in the following format: TN:<test name> For each source file referenced in the .da file, there is a section containing filename and coverage data: SF:<absolute path to the source file> Following is a list of line numbers for each function name found in the source file: FN:<line number of function start>,<function name> Next, there is a list of execution counts for each instrumented func- tion: FNDA:<execution count>,<function name> This list is followed by two lines containing the number of functions found and hit: FNF:<number of functions found> FNH:<number of function hit> Branch coverage information is stored which one line per branch: BRDA:<line number>,<block number>,<branch number>,<taken> Block number and branch number are gcc internal IDs for the branch. Taken is either '-' if the basic block containing the branch was never executed or a number indicating how often that branch was taken. Branch coverage summaries are stored in two lines: BRF:<number of branches found> BRH:<number of branches hit> Then there is a list of execution counts for each instrumented line (i.e. a line which resulted in executable code): DA:<line number>,<execution count>[,<checksum>] Note that there may be an optional checksum present for each instru- mented line. The current geninfo implementation uses an MD5 hash as checksumming algorithm. At the end of a section, there is a summary about how many lines were found and how many were actually instrumented: LH:<number of lines with a non-zero execution count> LF:<number of instrumented lines> Each sections ends with: end_of_record In addition to the main source code file there are sections for all #included files which also contain executable code. Note that the absolute path of a source file is generated by interpret- ing the contents of the respective .bb file (see gcov (1) for more in- formation on this file type). Relative filenames are prefixed with the directory in which the .bb file is found. Note also that symbolic links to the .bb file will be resolved so that the actual file path is used instead of the path to a link. This ap- proach is necessary for the mechanism to work with the /proc/gcov files. AUTHOR Peter Oberparleiter <Peter.Oberparleiter@de.ibm.com> SEE ALSO lcov(1), lcovrc(5), genhtml(1), genpng(1), gendesc(1), gcov(1) 2020-08-12 LCOV 1.15 geninfo(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | AUTHOR | SEE ALSO
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