[PATCH v4 09/19] qapi/expr.py: Check type of 'data' member

[John Snow]

We don't actually check, so the user can get some unpleasant stacktraces.
Formalize it.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qapi/expr.py                              | 7 +++++++
 tests/qapi-schema/alternate-invalid-data-type.err | 2 ++
 tests/qapi-schema/union-invalid-data-type.err     | 2 ++
 3 files changed, 11 insertions(+)

diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py
index 73e7d8cb0d..ca5ab7bfda 100644
--- a/scripts/qapi/expr.py
+++ b/scripts/qapi/expr.py
@@ -281,6 +281,9 @@ def check_union(expr, info):
             raise QAPISemError(info, "'discriminator' requires 'base'")
         check_name_is_str(discriminator, info, "'discriminator'")
 
+    if not isinstance(members, dict):
+        raise QAPISemError(info, "'data' must be an object")
+
     for (key, value) in members.items():
         source = "'data' member '%s'" % key
         if discriminator is None:
@@ -296,6 +299,10 @@ def check_alternate(expr, info):
 
     if not members:
         raise QAPISemError(info, "'data' must not be empty")
+
+    if not isinstance(members, dict):
+        raise QAPISemError(info, "'data' must be an object")
+
     for (key, value) in members.items():
         source = "'data' member '%s'" % key
         check_name_lower(key, info, source)
diff --git a/tests/qapi-schema/alternate-invalid-data-type.err 
b/tests/qapi-schema/alternate-invalid-data-type.err
index e69de29bb2..c7301ccb00 100644
--- a/tests/qapi-schema/alternate-invalid-data-type.err
+++ b/tests/qapi-schema/alternate-invalid-data-type.err
@@ -0,0 +1,2 @@
+alternate-invalid-data-type.json: In alternate 'Alt':
+alternate-invalid-data-type.json:2: 'data' must be an object
diff --git a/tests/qapi-schema/union-invalid-data-type.err 
b/tests/qapi-schema/union-invalid-data-type.err
index e69de29bb2..b71c3400c5 100644
--- a/tests/qapi-schema/union-invalid-data-type.err
+++ b/tests/qapi-schema/union-invalid-data-type.err
@@ -0,0 +1,2 @@
+union-invalid-data-type.json: In union 'TestUnion':
+union-invalid-data-type.json:9: 'data' must be an object
-- 
2.30.2