Direct Programming Interface (DPI) | Foreign Function Interface (FFI)

This issue is a placeholder for the discussion that is going on in different rooms, about defining a DPI/FFI interface for VHDL, to be included in the next revision of the standard.

• Existing proposal in Twiki: DpiProposal
• Thread in the reflector: grouper.ieee.org/groups/1076/email/msg01286
• Work in progress (headers, tests): gh:VHDL/Compliance-Tests: cosim
• "New" in-progress proposal (HTML, PDF or EPUB): umarcor.github.io/ghdl-cosim/vhdl202x
  • If site offline (not found), see PDF file attached to this comment.

---

From gh:ghdl/ghdl-cosim: vhpidirect:

• VFFI helpers:
  • vffi_user.h
  • vffi_user.vhd
    • vffi_user-body.vhd
• VFFI demo:
  • valuesFromVhdlToC: valuesFromVhdlToC.c and [valuesFromVhdlToC.vhd] (https://github.com/ghdl/ghdl-cosim/blob/master/vhpidirect/vffi_user/demo/valuesFromVhdlToC.vhd)
  • accessesFromVhdlToC: valuesFromVhdlToC.c and valuesFromVhdlToC.vhd
  • See execution example: https://github.com/ghdl/ghdl-cosim/runs/1462297961?check_suite_focus=true#step:6:1087

/cc @tgingold

vhdl202x-lcs-dpi.pdf