Dr. Memory provides optional code coverage information to aid in fuzz testing (Fuzz Testing Mode) or in general testing.

Enabling Coverage Information

Simply specify the -coverage runtime option to request code coverage information. The raw coverage data will be stored in a file with a "drcov" prefix in the regular Dr. Memory log directory. The file will be pointed at by a line at the end of the summary, if the application has a console for text output. This line looks like this:

~~Dr.M~~ Code coverage raw data: /home/joe/drmemory/logs/DrMemory-myapp.13112.000/drcov.myapp.13112.0000.proc.log

Post Processing

The "drcov" file is raw data in drcov format that must be post-processed to make it human readable. DynamoRIO's drcov2lcov utility converts it into lcov format. The Dr. Memory release package includes a copy of this utility. Simply use its -input parameter to point at the drcov log file:

dynamorio/tools/bin32/drcov2lcov -input logs/DrMemory-myapp.13112.000/drcov.myapp.13112.0000.proc.log

The resulting coverage.info file (in the current directory by default) is in the standard lcov format and can be processed by the lcov tool to produce nice html result pages.

For a full description of the drcov2lcov usage see the drcov documemtation at https://dynamorio.org/page_drcov.html.