This is a minimal garbage collector with code mostly taken from Epsilon GC and https://shipilev.net/jvm/diy-gc/ Its for educational and experimental purpose only.
- Clone JDK repository
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hg clone --debug --verbose http://hg.openjdk.java.net/jdk/jdk
- In case hg clone is very slow. You can download zip bundles and then apply the patch.
- Checkout this repo at some other location
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git clone git@github.com:unmeshjoshi/simgplegc.git
- Apply simplegc.patch to jdk source
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hg import simplegc.patch
- Build JDK as following
./configure --with-debug-level=slowdebug --with-native-debug-symbols=internal --with-boot-jdk=<jdk12-binary-home>
Note that you need a boot jdk to compile jdk source. Run configure with a boot jdk path on your system.make all
You should be able to run open this with eclipse cpp editor and debug placing the breakpoints where you want.