From: Marc-André Lureau <marcandre.lur...@redhat.com> We commonly initialize attributes to None in .init(), then set their real value in .check(). Accessing the attribute before .check() yields None. If we're lucky, the code that accesses the attribute prematurely chokes on None.
It won't for .ifcond, because None is a legitimate value. Leave the ifcond attribute undefined until check(). Suggested-by: Markus Armbruster <arm...@redhat.com> Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com> --- scripts/qapi/common.py | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py index 789c77f11f..78aeec785e 100644 --- a/scripts/qapi/common.py +++ b/scripts/qapi/common.py @@ -1028,13 +1028,19 @@ class QAPISchemaEntity(object): # such place). self.info = info self.doc = doc - self.ifcond = listify_cond(ifcond) + self._ifcond = ifcond # self.ifcond is set after check() def c_name(self): return c_name(self.name) def check(self, schema): - pass + if isinstance(self._ifcond, QAPISchemaType): + # inherit the condition from a type + typ = self._ifcond + typ.check(schema) + self.ifcond = typ.ifcond + else: + self.ifcond = listify_cond(self._ifcond) def is_implicit(self): return not self.info @@ -1171,6 +1177,7 @@ class QAPISchemaEnumType(QAPISchemaType): self.prefix = prefix def check(self, schema): + QAPISchemaType.check(self, schema) seen = {} for v in self.values: v.check_clash(self.info, seen) @@ -1203,8 +1210,10 @@ class QAPISchemaArrayType(QAPISchemaType): self.element_type = None def check(self, schema): + QAPISchemaType.check(self, schema) self.element_type = schema.lookup_type(self._element_type_name) assert self.element_type + self.element_type.check(schema) self.ifcond = self.element_type.ifcond def is_implicit(self): @@ -1247,6 +1256,7 @@ class QAPISchemaObjectType(QAPISchemaType): self.members = None def check(self, schema): + QAPISchemaType.check(self, schema) if self.members is False: # check for cycles raise QAPISemError(self.info, "Object %s contains itself" % self.name) @@ -1429,6 +1439,7 @@ class QAPISchemaAlternateType(QAPISchemaType): self.variants = variants def check(self, schema): + QAPISchemaType.check(self, schema) self.variants.tag_member.check(schema) # Not calling self.variants.check_clash(), because there's nothing # to clash with @@ -1471,6 +1482,7 @@ class QAPISchemaCommand(QAPISchemaEntity): self.boxed = boxed def check(self, schema): + QAPISchemaEntity.check(self, schema) if self._arg_type_name: self.arg_type = schema.lookup_type(self._arg_type_name) assert (isinstance(self.arg_type, QAPISchemaObjectType) or @@ -1504,6 +1516,7 @@ class QAPISchemaEvent(QAPISchemaEntity): self.boxed = boxed def check(self, schema): + QAPISchemaEntity.check(self, schema) if self._arg_type_name: self.arg_type = schema.lookup_type(self._arg_type_name) assert (isinstance(self.arg_type, QAPISchemaObjectType) or @@ -1632,7 +1645,7 @@ class QAPISchema(object): # But it's not tight: the disjunction need not imply it. We # may end up compiling useless wrapper types. # TODO kill simple unions or implement the disjunction - assert ifcond == typ.ifcond + assert ifcond == typ._ifcond else: self._def_entity(QAPISchemaObjectType(name, info, doc, ifcond, None, members, None)) @@ -1678,7 +1691,7 @@ class QAPISchema(object): assert len(typ) == 1 typ = self._make_array_type(typ[0], info) typ = self._make_implicit_object_type( - typ, info, None, self.lookup_type(typ).ifcond, + typ, info, None, self.lookup_type(typ), 'wrapper', [self._make_member('data', typ, info)]) return QAPISchemaObjectTypeVariant(case, typ) -- 2.13.6