Trouble using breakpoint scripting API

[v1993]

I'd like to try out breakpoint scripting API introduced in development versions of mGBA but can't get it to work for the life of mine.

First of all, setBreakpoint returns -1 , apparently hitting this, unless I open a debugger window and run something in it before executing setBreakpoint. But even then I can't get breakpoints to work - they just don't trigger, and if I manually set one from debugger console (break/t), the emulation hangs upon hitting it and only resumes once I reset the script window. I've also tried changing breakpoint type in _mScriptCoreAdapterSetBreakpoint to BREAKPOINT_SOFTWARE, but that aborts with core dump.

Code I run in scripting console to try and set breakpoint:

print(emu:setBreakpoint(function() print('Beakpoint hit') end, 0x80045a8))

For the record I'm testing this on commit ce374b1, GBA game Metroid Fusion (USA) with breakpoint at 0x80045a8 (THUMB code). Would greatly appreciate any help.

P.S.: what does the third segment argument do for setBreakpoint? I can't find any explanation for it and it does not appear to refer to memory domain either.

[v1993]

Regarding debugger initialization: it looks like it's up to frontend to set up a debugger and neither Qt nor SDL do it unless either GDB or built-in debugger have been used/enabled. This poses a problem to scripts since they have no way to request a debugger to be set up for current program. It also seems that solving this would require some refactoring, as setup/teardown of debugger is currently completely within responsibility of frontends and thus can't be easily added into scripting API.