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The PostgreSQL source code can be compiled with coverage testing instrumentation, so that it becomes possible to examine which parts of the code are covered by the regression tests or any other test suite that is run with the code. This is currently supported when compiling with GCC, and it requires thegcov andlcov programs.

A typical workflow looks like this:

./configure --enable-coverage ... OTHER OPTIONS ...makemake check # or other test suitemake coverage-html

Then point your HTML browser tocoverage/index.html.

If you don't havelcov or prefer text output over an HTML report, you can run

make coverage

instead ofmake coverage-html, which will produce.gcov output files for each source file relevant to the test. (make coverage andmake coverage-html will overwrite each other's files, so mixing them might be confusing.)

You can run several different tests before making the coverage report; the execution counts will accumulate. If you want to reset the execution counts between test runs, run:

make coverage-clean

You can run themake coverage-html ormake coverage command in a subdirectory if you want a coverage report for only a portion of the code tree.

Usemake distclean to clean up when done.