The GHC Debugger
summary
A standalone debugger application uses the GHC library and implements the Debug Adapter Protocol so VS Code, Emacs and other DAP clients can attach; it supports expression-level breakpoints for interpreted code but not compiled code, and lazy values can be expanded on demand in the editor. The implementation fixes long-standing performance problems — step-local 4x speedup and 91% reduced allocations in the GC test suite — and exposes runtime type reconstruction and a GHC library DAP server with lazy variable expansion; multithreaded and reverse-debugging features are planned.
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chapters (8)
- 0:00Introduction to the debugger
- 1:35Live demonstration
- 6:49Design and development
- 9:51IDE integration via DAP
- 11:00Performance improvements
- 11:48New features and future goals
- 15:14Q&A session
- 19:58Closing and call to action
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