[Xen-devel] [PATCH RFC v2 04/13] libxl: idl: support new "c_only" type attribute

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

This provides for fields in libxl datatypes which are only present in
the C version of structures.  This is useful, for example, when a
libxl datatype wants to contain fields which are used by libxl
internally and which are only present in the structure to avoid
additional memory allocation inconvenience.

Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libxl/gentest.py    |    2 ++
 tools/libxl/libxltypes.py |    4 +++-
 2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/tools/libxl/gentest.py b/tools/libxl/gentest.py
index 6697ac5..ed5358d 100644
--- a/tools/libxl/gentest.py
+++ b/tools/libxl/gentest.py
@@ -56,6 +56,8 @@ def gen_rand_init(ty, v, indent = "    ", parent = None):
         s += "%s = rand() %% 2;\n" % v
     elif ty.typename in ["char *"]:
         s += "%s = rand_str();\n" % v
+    elif ty.c_only:
+        pass
     elif ty.typename in handcoded:
         raise Exception("Gen for handcoded %s" % ty.typename)
     else:
diff --git a/tools/libxl/libxltypes.py b/tools/libxl/libxltypes.py
index 05cba88..83a9426 100644
--- a/tools/libxl/libxltypes.py
+++ b/tools/libxl/libxltypes.py
@@ -33,6 +33,8 @@ class Type(object):
         if self.passby not in [PASS_BY_VALUE, PASS_BY_REFERENCE]:
             raise ValueError
 
+        self.c_only = kwargs.setdefault('c_only', False)
+
         if typename is None: # Anonymous type
             self.typename = None
             self.rawname = None
@@ -50,7 +52,7 @@ class Type(object):
 
         self.autogenerate_destructor = 
kwargs.setdefault('autogenerate_destructor', True)
 
-        if self.typename is not None:
+        if self.typename is not None and not self.c_only:
             self.json_fn = kwargs.setdefault('json_fn', self.typename + 
"_gen_json")
         else:
             self.json_fn = kwargs.setdefault('json_fn', None)
-- 
1.7.2.5


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