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qapi: Check for member name conflicts with a base class

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Our type inheritance for both 'struct' and for flat 'union' merges
key/value pairs from the base class with those from the type in
question. Although the C code currently boxes things so that there
is a distinction between which member is referred to, the QMP wire
format does not allow passing a key more than once in a single
object. Besides, if we ever change the generated C code to not be
quite so boxy, we'd want to avoid duplicate member names there,
too.

Fix a testsuite entry added in an earlier patch, as well as adding
a couple more tests to ensure we have appropriate coverage. Ensure
that collisions are detected, regardless of whether there is a
difference in opinion on whether the member name is optional.

Backports commit ff55d72eaf9628e7d58e7b067b361cdbf789c9f4 from qemu
This commit is contained in:
Eric Blake 2018-02-19 14:38:42 -05:00 committed by Lioncash
parent 90dfdc5278
commit 7a82e7ff73
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 22 additions and 1 deletions
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23
qemu/scripts/qapi.py
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@ -414,6 +414,20 @@ def check_type(expr_info, source, value, allow_array = False,
allow_metas=['built-in', 'union', 'alternate', 'struct',
'enum'])
def check_member_clash(expr_info, base_name, data, source = ""):
base = find_struct(base_name)
assert base
base_members = base['data']
for key in data.keys():
if key.startswith('*'):
key = key[1:]
if key in base_members or "*" + key in base_members:
raise QAPIExprError(expr_info,
"Member name '%s'%s clashes with base '%s'"
% (key, source, base_name))
if base.get('base'):
check_member_clash(expr_info, base['base'], data, source)
def check_command(expr, expr_info):
name = expr['command']
allow_star = expr.has_key('gen')
@ -502,9 +516,14 @@ def check_union(expr, expr_info):
check_name(expr_info, "Member of union '%s'" % name, key)
# Each value must name a known type; furthermore, in flat unions,
# branches must be a struct
# branches must be a struct with no overlapping member names
check_type(expr_info, "Member '%s' of union '%s'" % (key, name),
value, allow_array=True, allow_metas=allow_metas)
if base:
branch_struct = find_struct(value)
assert branch_struct
check_member_clash(expr_info, base, branch_struct['data'],
" of branch '%s'" % key)
# If the discriminator names an enum type, then all members
# of 'data' must also be members of the enum type.
@ -581,6 +600,8 @@ def check_struct(expr, expr_info):
allow_dict=True, allow_optional=True)
check_type(expr_info, "'base' for struct '%s'" % name, expr.get('base'),
allow_metas=['struct'])
if expr.get('base'):
check_member_clash(expr_info, expr['base'], expr['data'])
def check_exprs(schema):
for expr_elem in schema.exprs: