[RFC v2 0/7] add function support to IDL

[Nick Rosbrook <rosbrookn@xxxxxxxxx>]

At a Xen Summit design session for the golang bindings (see [1]), we
agreed that it would be beneficial to expand the libxl IDL with function
support. In addition to benefiting libxl itself, this would allow other
language bindings to easily generate function wrappers.

The first version of this RFC is quite old [1]. I did address comments
on the original RFC, but also expanded the scope a bit. As a way to
evaluate function support, I worked on using this addition to the IDL to
generate device add/remove/destroy functions, and removing the
corresponding macros in libxl_internal.h. However, I stopped short of
actually completing a build with this in place, as I thought it made
sense to get feedback on the idea before working on the next step.

[1] https://lists.xenproject.org/archives/html/xen-devel/2020-07/msg00964.html
[2] https://lists.xenproject.org/archives/html/xen-devel/2020-07/msg01352.html

Nick Rosbrook (7):
  libxl: remove extra whitespace from gentypes.py
  libxl: add Function class to IDL
  libxl: add PASS_BY_CONST_REFERENCE to idl
  libxl: add DeviceFunction classes to IDL
  libxl: add device function definitions to libxl_types.idl
  libxl: implement device add/remove/destroy functions generation
  libxl: replace LIBXL_DEFINE_DEVICE* macro usage with generated code

 tools/golang/xenlight/gengotypes.py |   2 +-
 tools/libs/light/gentypes.py        | 107 +++++++++++++--
 tools/libs/light/idl.py             |  69 +++++++++-
 tools/libs/light/libxl_9pfs.c       |   2 -
 tools/libs/light/libxl_console.c    |   2 -
 tools/libs/light/libxl_disk.c       |   2 -
 tools/libs/light/libxl_nic.c        |   2 -
 tools/libs/light/libxl_pvcalls.c    |   2 -
 tools/libs/light/libxl_types.idl    | 202 ++++++++++++++++++++++++++++
 tools/libs/light/libxl_usb.c        |   3 -
 tools/libs/light/libxl_vdispl.c     |   2 -
 tools/libs/light/libxl_vkb.c        |   1 -
 tools/libs/light/libxl_vsnd.c       |   2 -
 tools/libs/light/libxl_vtpm.c       |   2 -
 14 files changed, 367 insertions(+), 33 deletions(-)

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2.17.1