2020_1001_Meeting < P1076

P1076 Web>Vhdl202X_MeetingMinutes>2020_1001_Meeting (2020-10-01, JimLewis) (raw view)EditAttach
---+ P1076 Minutes from October 1, 2020
---++ Attendees
   * Jim Lewis, Unai Martinez-Corral, Peter Ladow, Peter Flake
---++ Meeting Discussion
   * DPI
      * Attribute EXPORT vs FOREIGN: it's ok to have two separate attributes, for making it explicit, albeit slightly redundant.
      * We agree that providing a standardized C header for defining fat pointers is desirable. However, we need feedback from vendors.
         * Unai will update https://github.com/umarcor/ghdl-cosim/blob/develop/vhpidirect/vffi_user.h, by including fat pointers for access types.
         * PeterFlake will look how SV handles these, as he (obviously) can not remember such specific details.
      * The FFI/DPI interface will NOT be part of VHPI, but a separate interface. However, data type conversions, specially of simple types, will be shared. That is, section _22.2_ of the current LRM.
      * We discussed about variables of modes `out` or `inout` and about passing signals. These, along with supporting `wait` statements in foreign functions does require a further thought.
         * The first version might just not support either `wait` statements or signals, but only variables or constants. However, we should consider other features too, so we avoid future breaking changes.
      * PeterLadow proposed all symbols to be exported and imported automatically, through name mangling, as in C++.
         * That's related to https://umarcor.github.io/ghdl-cosim/vhdl202x/proposal-vffi.html#deferreddef and https://umarcor.github.io/ghdl-cosim/vhdl202x/proposal-vffi.html#function-overloading
---++ Next Meeting

?? (8, 29) October 2020, 11 am Pacific *Daylight* Time (GMT-7)
---++ Comments

<br />%COMMENT%
Topic revision: r1 - 2020-10-01 - 18:01:25 - JimLewis
P1076