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qapi-types/visit.py: Inheritance for structs

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This introduces a new 'base' key for struct definitions that refers to
another struct type. On the JSON level, the fields of the base type are
included directly into the same namespace as the fields of the defined
type, like with unions. On the C level, a pointer to a struct of the
base type is included.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2013-09-19 11:56:36 +02:00
parent 14d36307ff
commit 622f557f5a
3 changed files with 37 additions and 2 deletions
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4
scripts/qapi-types.py
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@ -86,6 +86,7 @@ def generate_struct(expr):
structname = expr.get('type', "")
fieldname = expr.get('field', "")
members = expr['data']
base = expr.get('base')
ret = mcgen('''
struct %(name)s
@ -93,6 +94,9 @@ struct %(name)s
''',
name=structname)
if base:
ret += generate_struct_fields({'base': base})
ret += generate_struct_fields(members)
if len(fieldname):