[P4-design] P4 language design resuming

Mihai Budiu mbudiu at vmware.com
Mon Oct 1 13:32:21 EDT 2018


Hello everyone,

We are planning to resume our quasi-regular meetings of the P4 design working group.
We have accumulated some interesting items to work on. Here is a list of what I could find. Please send more suggestions if I missed something.
The plan would be to resume the meetings on Mondays at 1:30-3:00, using both videoconferencing and in-person meetings rotating between several locations.

Mihai & Nate


  *   Useful generics using some form of type constraints
  *   A corner case in the slice operator applied to signed integers: https://github.com/p4lang/p4-spec/issues/668
  *   Statically determining the size of a header: https://github.com/p4lang/p4-spec/issues/660
  *   A module system to replace #include: https://github.com/p4lang/p4-spec/issues/628
  *   Operator overloading, may be useful for supporting newly introduced types: https://github.com/p4lang/p4-spec/issues/616
  *   Abstract methods in extern objects; these are already an experimental feature, with lots of subtle problems, including capturing the environment: https://github.com/p4lang/p4-spec/issues/561, https://github.com/p4lang/p4c/issues/1175, https://github.com/p4lang/p4c/pull/1468, https://github.com/p4lang/p4c/pull/1284, etc.
  *   Structure initializers with named fields; there is now some support in the IR to make this easier: https://github.com/p4lang/p4c/pull/1498
  *   Supporting both hit and switch: https://github.com/p4lang/p4-spec/issues/485
  *   Writable "in" arguments: https://github.com/p4lang/p4-spec/issues/424
  *   Allow structs in headers: https://github.com/p4lang/p4-spec/issues/383
  *   Run-time int values: https://github.com/p4lang/p4-spec/issues/347
  *   Int type: https://github.com/p4lang/p4-spec/issues/331
  *   Defining operations in varbits: https://github.com/p4lang/p4-spec/issues/264
  *   Empty tuples: https://github.com/p4lang/p4-spec/issues/282
  *   Header stack initializers: https://github.com/p4lang/p4-spec/issues/198
  *   Named field lists: https://github.com/p4lang/p4-spec/issues/51
  *   Some form of iterators: https://github.com/p4lang/p4-spec/issues/84
  *   Structure overlays: https://github.com/p4lang/p4-spec/pull/656
  *   Deprecated annotation: https://github.com/p4lang/p4-spec/pull/655
  *   Computed bit-widths: https://github.com/p4lang/p4-spec/pull/641


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