I think you could start by looking at these plugins:
They provide the GDB integration by using the DSF framework. I
don't know if it's the best way to start but when I started
looking at integrating CDB, I started by extending the
org.eclipse.debug.core.launchDelegates extension point. Then
org.eclipse.debug.ui.launchConfigurationTabs to get the main tab,
etc. Good luck!
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I was wondering whether any code has been checked into SVN.
Specifically I'd like to know how eclipse calls into LLDB.
May I presume a Java wrapper into the LLDB API is being used rather than the GDB MI text commands.