Hello.
I glad to present very simple implementation of object centric debugging based on Ghost and ObjectVirus projects.
You can try it by:
Metacello new
smalltalkhubUser: 'Pharo' project: 'Ghost';
configuration: 'Ghost';
version: #development;
load: 'ObjectCallHalt'
With this package you can ask any object to #haltOnNextCall and It adds new button in debugger "Run to next self send".
Best regards.
Denis