GCOV MANUAL PDF

Gcov can be used on any platform as soon as these binutils are in PATH. For example, you can use it on Windows with Cygwin. When the user tires to run gcov for the first time, the user will be asked if he would like eclipse to enable gcov for the user automatically. This will enable the debug checkbox 'Generate Gcov information' in the setting shown in the following screenshot:. Once the application is compiled and run is finished, several "gcno" and "gcda" files are generated under the project. Double clicking on one of these files will open a dialog to select the associated binary.

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Gcovr provides a utility for managing the use of the GNU gcov utility and generating summarized code coverage results. This command is inspired by the Python coverage. The gcovr command can produce different kinds of coverage reports:.

Thus, gcovr can be viewed as a command-line alternative to the lcov utility, which runs gcov and generates an HTML-formatted report. The development of gcovr was motivated by the need for text summaries and XML reports. Automated test results are available through Travis CI and Appveyor. Gcovr is available under the BSD license. The gcovr command provides a summary of the lines that have been executed in a program.

Code coverage statistics help you discover untested parts of a program, which is particularly important when assessing code quality. Well-tested code is a characteristic of high quality code, and software developers often assess code coverage statistics when deciding if software is ready for a release. The gcovr command can be used to analyze programs compiled with GCC. The following sections illustrate the application of gcovr to test coverage of the following program:.

This code executes several subroutines in this program, but some lines in the program are not executed. We compile example1. Note that we compile this program without optimization, because optimization may combine lines of code and otherwise change the flow of execution in the program. Additionally, we compile with the -fprofile-arcs -ftest-coverage -fPIC compiler options, which add logic to generate output files that can be processed by the gcov command. The compiler generates the program executable.

When we execute this command:. These files are processed with by gcov to generate code coverage statistics. The gcovr command calls gcov and summarizes these code coverage statistics in various formats. For example:. Each line of this output includes a summary for a given source file, including the number of lines instrumented, the number of lines executed, the percentage of lines executed, and a summary of the line numbers that were not executed.

The -r option specifies the root directory for the files that are being analyzed. This allows gcovr to generate a simpler report without absolute path names , and it allows system header files to be excluded from the analysis. Note that gcov accumulates statistics by line. Consequently, it works best with a programming style that places only one statement on each line.

The gcovr command can also summarize branch coverage using the --branches option:. This generates a tabular output that summarizes the number of branches, the number of branches taken and the branches that were not completely covered:. The default output format for gcovr is to generate a tabular summary in plain text. The gcovr command can also generate an XML output using the --xml and --xml-pretty options:.

The --xml option generates a denser XML output, and the --xml-pretty option generates an indented XML output that is easier to read. Note that the XML output contains more information than the tabular summary.

The tabular summary shows the percentage of covered lines, while the XML output includes branch statistics and the number of times that each line was covered.

Consequently, XML output can be used to support performance optimization in the same manner that gcov does. The gcovr command can also generate a simple HTML output using the --html option:. This generates a HTML summary of the lines executed. In this example, the file example1. The default behavior of the --html option is to generate HTML for a single webpage that summarizes the coverage for all files.

The --html-details option is used to create a separate web page for each file. Each of these web pages includes the contents of file with annotations that summarize code coverage. Consider the following command:. This generates the following HTML page for the file example1. Note that the --html-details option can only be used with the -o --output option. For example, if the --output option specifies the output file coverage.

The gcovr command recursively searches a directory tree to find gcov coverage files, and generates a text summary of the code coverage. The --help option generates the following summary of the gcovr command line options:.

The root directory of your source files. File names are reported relative to this root. The --root is the default --filter. Exit with a status of 2 if the total line coverage is less than MIN. Exit with a status of 4 if the total branch coverage is less than MIN. Default is HIGH has to be greater than or equal to value of --html-medium-threshold.

If HIGH is equal to value of --html-medium-threshold the report has only high and low coverage. Add annotated source code reports to the HTML report. Requires --output as a basename for the reports. Implies --html. This is in addition to other reports. Default: False. Filters decide which files are included in the report. Any filter must match, and no exclude filter must match.

A filter is a regular expression that matches a path. Filter paths use forward slashes, even on Windows. Keep only source files that match this filter. Can be specified multiple times. If no filters are provided, defaults to --root. Exclude directories that match this regex while searching raw coverage files. The gcno files are generated by the compiler. The gcda files are generated when the instrumented program is executed. Use a particular gcov executable.

Must match the compiler you are using, e. Can include additional arguments. Skip lines with parse errors in GCOV files instead of exiting with an error. A report will be shown on stderr. Override normal working directory detection. Gcovr needs to identify the path between gcda files and the directory where the compiler was originally run.

Normally, gcovr can guess correctly. This option specifies either the path from gcc to the gcda file i. Keep gcov files after processing. This applies both to files that were generated by gcovr, or were supplied via the --use-gcov-files option.

The above Getting Started guide illustrates the use of some command line options. Using Filters is discussed below. Gcovr tries to only report coverage for files within your project, not for your libraries.

This is influenced by the following options:. These options take filters. A filter is a regular expression that matches a file path. If the filter looks like an absolute path, it is matched against an absolute path.

Otherwise, the filter is matched against a relative path, where that path is relative to the current directory. Examples of relative filters:. If no --filter is provided, the --root is turned into a default filter. Therefore, files outside of the --root directory are excluded. To be included in a report, the source file must match any --filter , and must not match any --exclude filter.

The --gcov-filter and --gcov-exclude filters apply to the. But these filters also apply when gcov is launched by gcovr. The --exclude-directories filter is used while searching for raw coverage data or for existing. This filter is matched against directory paths, not file paths.

If a directory matches, all its contents files and subdirectories will be excluded from the search. For example, consider this build directory:. This can speed up gcovr when you have a complicated build directory structure.

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What is coverage?

Gcov is a source code coverage analysis and statement-by-statement profiling tool. Gcov generates exact counts of the number of times each statement in a program is executed and annotates source code to add instrumentation. The gcov utility gives information on how often a program executes segments of code. The gcov utility does not produce any time-based data and works only on code compiled with the GCC suite. The manual claims it is not compatible with any other profiling or test coverage mechanism, [3] but it works with llvm -generated files, too.

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Gcovr provides a utility for managing the use of the GNU gcov utility and generating summarized code coverage results. This command is inspired by the Python coverage. The gcovr command can produce different kinds of coverage reports:. Thus, gcovr can be viewed as a command-line alternative to the lcov utility, which runs gcov and generates an HTML-formatted report. The development of gcovr was motivated by the need for text summaries and XML reports.

GCOV MANUAL PDF

Gcovr provides a utility for managing the use of the GNU gcov utility and generating summarized code coverage results. This command is inspired by the Python coverage. The gcovr command can produce different kinds of coverage reports:. Thus, gcovr can be viewed as a command-line alternative to the lcov utility, which runs gcov and generates an HTML-formatted report. The development of gcovr was motivated by the need for text summaries and XML reports.

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