qapi script: support enum type as discriminator in union

By default, any union will automatically generate a enum type as
"[UnionName]Kind" in C code, and it is duplicated when the discriminator
is specified as a pre-defined enum type in schema. After this patch,
the pre-defined enum type will be really used as the switch case
condition in generated C code, if discriminator is an enum field.

Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/qapi-schema/flat-union-reverse-define.json b/tests/qapi-schema/flat-union-reverse-define.json
new file mode 100644
index 0000000000..9ea7e72201
--- /dev/null
+++ b/tests/qapi-schema/flat-union-reverse-define.json
@@ -0,0 +1,17 @@
+{ 'union': 'TestUnion',
+  'base': 'TestBase',
+  'discriminator': 'enum1',
+  'data': { 'value1': 'TestTypeA',
+            'value2': 'TestTypeB' } }
+
+{ 'type': 'TestBase',
+  'data': { 'enum1': 'TestEnum' } }
+
+{ 'enum': 'TestEnum',
+  'data': [ 'value1', 'value2' ] }
+
+{ 'type': 'TestTypeA',
+  'data': { 'string': 'str' } }
+
+{ 'type': 'TestTypeB',
+  'data': { 'integer': 'int' } }