OpenJDK Code coverage

Here’s the Adopt OpenJDK’s jab at code-coverage.

Existing code coverage reports (OpenJDK8 and OpenJDK9 Recently we have enabled code coverage on our Adopt OpenJDK build farms running a CI build of OpenJDK8 and OpenJDK9, publishing jcov reports for OpenJDK8 and OpenJDK9 [dead-link] respectively.

Running tests with code-coverage enabled for OpenJDK9

Notes:

• similar steps can me performed for 'OpenJDK8' as well.
• these settings are for generating coverage for the 'jdk' repo only
• we didn't have success in producing one for 'langtools'

• Ensure your have the lastest jdk images built in tge build folder of OpenJDK9 (see Build your own OpenJDK).

• Install jtreg with the jcov, see How to use JTReg... > Preparations.

• Apply these exports to your .bash_xxx profile:

export SOURCE_CODE=/home/<username>/workspace/jdk9/
export JTREG_INSTALL=/home/<username>/workspace/jtreg
export JT_HOME=$JTREG_INSTALL
export JTREG_HOME=$JTREG_INSTALL
export PRODUCT_HOME=$SOURCE_CODE/build/linux-x86_64-normal-server-release/images/jdk 
export JPRT_JTREG_HOME=${JT_HOME}
export JPRT_JAVA_HOME=${PRODUCT_HOME}
export JTREG_TIMEOUT_FACTOR=5
export CONCURRENCY=8

$ cd $SOURCES/jdk9/jdk/test

• Edit the Makefile and add the following, just before the line # Make sure jtreg exists:

jdkroot=<hardcoded path to your jdk9, see above>

JTREG_TEST_OPTIONS += -jcov/classes:$(jdkroot)/build/linux-x86_64-normal-server-release/jdk/modules/java.base
JTREG_TEST_OPTIONS += -jcov/source:$(jdkroot)/jdk/src/java.base/share/classes
JTREG_TEST_OPTIONS += -jcov/include:*

• Run tests in debug mode

  $ cd ..
  $ make test LOG=debug
  

• Opening the generated coverage report

Once finished, look for the report in the below location:

$ cd $SOURCES/jdk9/build/linux-x86_64-normal-server-release/testoutput/jdk_core/JTreport/jcov/
$ open index.html

This will normally take a couple of hours depending on the available resources and how performant your sysyem is.

Also see Building jcov.