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dll.md

MoarVM DLL handling

I propose the following additions to the codebase:

structs

  • MVMDLLibRegistry

Wraps dyncall's DLLib* together with a string id in a per-instance hash.

Keeps track of a refcount to prevent the user from prematurely freeing a library.

reprs

  • DLSym

Wraps the pointer returned by dlFindSymbol() together with a MVMDLLibRegistry*.

Conjecture: This will be the argument to the (yet to be implemented) loadextop (or whatever we end up calling it) and could be used as input to my ptrcast op from the ctypes branch. (adding exptops by symbol is probably not a good idea)

ops

  • loadlib(str id, str path)
  • freelib(str id)
  • findsym(str id, str name) -> obj sym
  • dropsym(obj sym)

dropsym sets a symbol to NULL, decreasing the refcount of the containing library.

Open question: How should loadlib handle libraries that (according to their id) have already been loaded? Silently ignore, throw or via return value?

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