commit 0f61af3eb396ae163cd1572ce12e05f5d08d7c15
author Markus Armbruster <armbru@redhat.com> Fri Jul 31 10:30:04 2015 +0200
committer Markus Armbruster <armbru@redhat.com> Fri Sep 04 15:47:13 2015 +0200
tree 6bf37b6d51adf1446d7cd4f1f22beb061e380f5a
parent 5aa05d3f72e556752167f7005d6a3dea0f4432c5

qapi: Fix generated code when flat union has member 'kind'

A flat union's tag member gets renamed to 'kind' in the generated
code.  Breaks when another member named 'kind' exists.

Example, adapted from qapi-schema-test.json:

    { 'struct': 'UserDefUnionBase',
      'data': { 'kind': 'str', 'enum1': 'EnumOne' } }

We generate:

    struct UserDefFlatUnion
    {
        EnumOne kind;
        union {
            void *data;
            UserDefA *value1;
            UserDefB *value2;
            UserDefB *value3;
        };
        char *kind;
    };

Kill the silly rename.

Reported-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

scripts/qapi-visit.py

diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index e8ee268..4ec79a6 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -288,20 +288,23 @@
                      name=c_name(name))
 
     if not discriminator:
+        tag = 'kind'
         disc_key = "type"
     else:
+        tag = discriminator
         disc_key = discriminator
     ret += mcgen('''
-        visit_type_%(disc_type)s(m, &(*obj)->kind, "%(disc_key)s", &err);
+        visit_type_%(disc_type)s(m, &(*obj)->%(c_tag)s, "%(disc_key)s", &err);
         if (err) {
             goto out_obj;
         }
         if (!visit_start_union(m, !!(*obj)->data, &err) || err) {
             goto out_obj;
         }
-        switch ((*obj)->kind) {
+        switch ((*obj)->%(c_tag)s) {
 ''',
                  disc_type = disc_type,
+                 c_tag=c_name(tag),
                  disc_key = disc_key)
 
     for key in members: