[Bug translator/4529] New: tapset coverage option

[Bug translator/4529] New: tapset coverage option

[fche at redhat dot com]

The translator should be able to compute test coverage data for tapsets.
There are still some that don't have test cases, never mind documentation,
and a machine nagging about that would be healthy.

-- 
           Summary: tapset coverage option
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4529

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[Bug translator/4529] tapset coverage option

[wcohen at redhat dot com]

------- Additional Comments From wcohen at redhat dot com  2007-05-24 21:21 -------
Currently there is no information about what parts of the tapset and
scripts are exercised during testing.  Systemtap needs some way
determining what sections of tapsets and scripts are executed.

Code coverage techniques have already been implemented in GCC for
various languages compiled by GCC.

http://gcc.gnu.org/onlinedocs/gcc-4.2.0/gcc/Gcov.html#Gcov

The code coverage of kernel code has also been implemented with
extensions to GCOV:

http://ltp.sourceforge.net/coverage/

The C code compiled with the gcc options (`-fprofile-arcs
-ftest-coverage') writes out information to files (x.gcno). When the
compiled code is run, data is written into x.gcda file. It seems like
systemtap generated code could generate compatible files, so that
analysis could be done lcov.

Where to put the files?
	In the same directory as the original script .stp?

How to deal with the tapsets in separate directories?
	Make use of the GCOV_PREFIX_STRIP and GCOV_PREFIX env variables?

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|systemtap at sources dot    |wcohen at redhat dot com
                   |redhat dot com              |
             Status|NEW                         |ASSIGNED


http://sourceware.org/bugzilla/show_bug.cgi?id=4529

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