libxl: IDL: autogenerate functions to produce JSON from libxl data structures.

Two functions are provided. TYPE_gen_json exposes an interface which is
compatible with the YAGL generator infrastructure. TYPE_to_string uses this to
produce a pretty printed string.

The TYPE_gen_json functions are defined in a new header libxl_json.h which is
not exposed via libxl.h due to the use of YAGL datatypes to avoid poluting the
namespace us libxl users which don't use the library themselves.  If a libxl
user is interested in integrating at the YAGL level then it should #include
this file itself.

Also update testidl to generate a random version of each IDL datastructure and
convert it to JSON. Unfortunately this requires a libxl_ctx and therefore the
test must be run on a Xen system now.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/tools/libxl/idl.txt b/tools/libxl/idl.txt
index 271a2a8900..8c9a32364d 100644
--- a/tools/libxl/idl.txt
+++ b/tools/libxl/idl.txt
@@ -49,6 +49,15 @@ Type.autogenerate_destructor: (default: True)
  Indicates if the above named Type.destructor_fn should be
  autogenerated.
 
+Type.json_fn: (default: typename + "_gen_json" or None if type == None)
+
+ The name of the C function which will generate a YAJL data structure
+ representing this type.
+
+Type.autogenerate_json: (default: True)
+
+ Indicates if the above named Type.json_fn should be autogenerated.
+
 Other simple type-Classes
 -------------------------