Hi MarLinn, The mangling name is "z-encoded". It is documented here: https://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/SymbolNames Edward Excerpts from MarLinn's message of 2017-10-14 17:35:28 +0200:
Hi.
I'm experimenting with plug-ins right now. I did manage to dynamically load functions at runtime. The caveat: Something (cabal? ghc?) mangles the package names. For example, to load a function called "theFunction" from a module called "Callee" in a package "Plugin", I had to address it via the name "Pluginzm0zi0zi0zi0zm2QaFQQzzYhnKJSPRXA7VtPe_Callee_theFunction_closure". O…K. Most parts of that are clear, and thanks for making my package cooler by appending a "z", but who is this Ozi guy and why is he rapping about modems? Without knowing Ozi, the only way I found to get at this magic string is to manually look at the actual ELF-header of the compiled module. While that might be a robust way, it seems neither portable nor elegant.
The "plugins" library failed too, probably for the same reason. (Or it's under-documented. Probably both.) The "dynamic-loader" library does something via c, therefore no.
Which brings me to the question: Is there any way for a module to get at its own internal package name? Or even at the internal name of an external package? If not, can I somehow recreate the magic mangling at runtime? At first I thought the functions in the "Module", "Name" etc modules of GHC might help – but it seems I either need an existing Name (that I have no idea how to get) or I have to create one (with no idea what magic mangler to call).
I'm asking this question here rather than on café as I feel that if there is a solution, it's probably buried in the details of GHC.
Thanks for any suggestions, MarLinn