[Qemu-devel] [RFC PATCH 02/11] qapi-types.py: Implement 'base' for unions

[Kevin Wolf <kwolf@redhat.com>]

The new 'base' key in a union definition refers to a struct type, which
is inlined into the union definition and can represent fields common to
all kinds.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 scripts/qapi-types.py | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
index e1239e1..960065b 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi-types.py
@@ -157,7 +157,16 @@ typedef enum %(name)s
 
     return lookup_decl + enum_decl
 
-def generate_union(name, typeinfo):
+def generate_union(expr):
+
+    name = expr['union']
+    typeinfo = expr['data']
+
+    if expr.has_key('base'):
+        base = expr['base']
+    else:
+        base = None
+
     ret = mcgen('''
 struct %(name)s
 {
@@ -176,6 +185,13 @@ struct %(name)s
 
     ret += mcgen('''
     };
+''')
+
+    if base:
+        struct = find_struct(base)
+        ret += generate_struct_fields(struct['data'])
+
+    ret += mcgen('''
 };
 ''')
 
@@ -359,7 +375,7 @@ for expr in exprs:
         ret += generate_type_cleanup_decl(expr['type'])
         fdef.write(generate_type_cleanup(expr['type']) + "\n")
     elif expr.has_key('union'):
-        ret += generate_union(expr['union'], expr['data'])
+        ret += generate_union(expr)
         ret += generate_type_cleanup_decl(expr['union'] + "List")
         fdef.write(generate_type_cleanup(expr['union'] + "List") + "\n")
         ret += generate_type_cleanup_decl(expr['union'])
-- 
1.8.1.4