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qapi-visit.py: Implement 'base' for unions 

This implements the visitor part of base types for unions. Parsed into
QMP, this example schema definition...

    { 'type': 'BlockOptionsBase', 'data': { 'read-only': 'bool' } }
    { 'type': 'BlockOptionsQcow2, 'data': { 'lazy-refcounts': 'bool' } }

    { 'union': 'BlockOptions',
      'base': 'BlockOptionsBase',
      'data': {
          'raw': 'BlockOptionsRaw'
          'qcow2': 'BlockOptionsQcow2'
      } }

...would describe the following JSON object:

    { "type": "qcow2",
      "read-only": true,
      "data": { "lazy-refcounts": false } }

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2013-07-02 16:20:04 +02:00
parent d131c897f3
commit 0aef92b90d
1 changed files with 25 additions and 5 deletions
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30
scripts/qapi-visit.py
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@ -151,7 +151,13 @@ def generate_visit_enum(name, members):
''',
name=name)
def generate_visit_union(name, members):
def generate_visit_union(expr):
name = expr['union']
members = expr['data']
base = expr.get('base')
ret = generate_visit_enum('%sKind' % name, members.keys())
ret += mcgen('''
@ -164,14 +170,28 @@ def generate_visit_union(name, members):
visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
if (!err) {
if (obj && *obj) {
visit_type_%(name)sKind(m, &(*obj)->kind, "type", &err);
if (!err) {
switch ((*obj)->kind) {
''',
name=name)
push_indent()
push_indent()
push_indent()
if base:
struct = find_struct(base)
push_indent()
ret += generate_visit_struct_fields("", struct['data'])
pop_indent()
pop_indent()
ret += mcgen('''
visit_type_%(name)sKind(m, &(*obj)->kind, "type", &err);
if (!err) {
switch ((*obj)->kind) {
''',
name=name)
for key in members:
ret += mcgen('''
case %(abbrev)s_KIND_%(enum)s:
@ -368,7 +388,7 @@ def maybe_open(really, name, opt):
ret = generate_declaration(expr['type'], expr['data'])
fdecl.write(ret)
elif expr.has_key('union'):
ret = generate_visit_union(expr['union'], expr['data'])
ret = generate_visit_union(expr)
ret += generate_visit_list(expr['union'], expr['data'])
fdef.write(ret)