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s=mimecast20190719; t=1713946637; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Z99NS76qH48U3Rq6MrfJtlvHgLpyxgol+XqPiEz7v00=; b=BPI1wMs0EeLnjMj7UF+ZsO77KhOqR4xl6nbP8dvRTfWBzDC+P+NxyNJydXKoZtnkFErpI3 xu8BRDCs2A5PeJSKa8mZZ3JWhejtFeAM0FkQqUHsseofqyQNImULOuaBoACXSlzhfStPhh T8ZXQEuoMpW93SMlwopoJYgGixLUC8k= X-MC-Unique: UeF7BMbnONSB0s-vzti1sA-1 From: Markus Armbruster To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org, John Snow Subject: [PULL 16/25] qapi/schema: Don't initialize "members" with `None` Date: Wed, 24 Apr 2024 10:17:01 +0200 Message-ID: <20240424081710.2907748-17-armbru@redhat.com> In-Reply-To: <20240424081710.2907748-1-armbru@redhat.com> References: <20240424081710.2907748-1-armbru@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.67, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1713946690402100005 Content-Type: text/plain; charset="utf-8" From: John Snow Declare, but don't initialize the "members" field with type List[QAPISchemaObjectTypeMember]. This simplifies the typing from what would otherwise be Optional[List[T]] to merely List[T]. This removes the need to add assertions to several callsites that this value is not None - which it never will be after the delayed initialization in check() anyway. The type declaration without initialization trick will cause accidental uses of this field prior to full initialization to raise an AttributeError. (Note that it is valid to have an empty members list, see the internal q_empty object as an example. For this reason, we cannot use the empty list as a replacement test for full initialization and instead rely on the _checked/_check_complete fields.) Signed-off-by: John Snow Reviewed-by: Markus Armbruster Signed-off-by: Markus Armbruster Message-ID: <20240315152301.3621858-17-armbru@redhat.com> --- scripts/qapi/schema.py | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py index 2c3de72ae6..74b0d7b007 100644 --- a/scripts/qapi/schema.py +++ b/scripts/qapi/schema.py @@ -20,7 +20,7 @@ from collections import OrderedDict import os import re -from typing import List, Optional +from typing import List, Optional, cast =20 from .common import ( POINTER_SUFFIX, @@ -449,7 +449,7 @@ def __init__(self, name, info, doc, ifcond, features, self.base =3D None self.local_members =3D local_members self.variants =3D variants - self.members =3D None + self.members: List[QAPISchemaObjectTypeMember] self._check_complete =3D False =20 def check(self, schema): @@ -482,7 +482,11 @@ def check(self, schema): for m in self.local_members: m.check(schema) m.check_clash(self.info, seen) - members =3D seen.values() + + # self.check_clash() works in terms of the supertype, but + # self.members is declared List[QAPISchemaObjectTypeMember]. + # Cast down to the subtype. + members =3D cast(List[QAPISchemaObjectTypeMember], list(seen.value= s())) =20 if self.variants: self.variants.check(schema, seen) @@ -515,11 +519,9 @@ def is_implicit(self): return self.name.startswith('q_') =20 def is_empty(self): - assert self.members is not None return not self.members and not self.variants =20 def has_conditional_members(self): - assert self.members is not None return any(m.ifcond.is_present() for m in self.members) =20 def c_name(self): --=20 2.44.0