2020-12-03 Meeting

Attendees

Peter Flake, Unai Martinez-Corral, Tristan Gingold, Jim Lewis

Meeting Discussion

• DPI
  • Registration of foreign subprograms
    • Can allow function, pointer to function or any of them.
    • Should not require the (dummy) VHDL body of foreign functions.
    • Can not require the definition of foreign functions, unless actually used.
  • Calling convention
    • Keyword IMPORT_C or VFFI.
    • Allow multiple registrations for different tools.
  • Deferred definition of external subprograms
    • Allow prototype ?
    • Name mangling ?
  • Interface modes and classes
    • in, out, inout
    • constant, variable, signal
    • support wait ?
  • Types
    • fat pointer for unconstrained arrays
    • fat pointer for accesses to unconstrained arrays
      • Note: in GHDL fields data and bounds/range are in a different order within the struct. That's because of slices.
    • Memory layout
      • to vs downto
      • bit ordering within bytes: reverseBitsInBytes
        • vfficharArr2bitArr, vffibitArr2charArr
      • multidimensional arrays

Next Meeting

17 December 202, 11 am Pacific Daylight Time (GMT-7)