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s=mimecast20190719; t=1710516210; 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=XUbETe0HpQ0ytMGrfpXOdJAYxPuTEstiv/nvtKZ5VoY=; b=EJEiVDQrLYBOkaBUwMjpkkIcIWJ1YBiO1IRECu0AqokUbekHNzbBstTA1G4P1gxTyE4PKR //CJSyNQ+W1yrPrVU2mhu8H4vetGeu9f/fxBKFX+68nyxdW4rq6T85/0mbMmU6Lm0/WkXW ar8eaIv6IzPz/xtMuAI6wG/X+3S1gJw= X-MC-Unique: BRVrsVTFO-2dEyPEnM4jvg-1 From: Markus Armbruster To: qemu-devel@nongnu.org Cc: jsnow@redhat.com, peter.maydell@linaro.org, michael.roth@amd.com Subject: [PATCH v5 07/25] qapi/schema: declare type for QAPISchemaArrayType.element_type Date: Fri, 15 Mar 2024 16:22:43 +0100 Message-ID: <20240315152301.3621858-8-armbru@redhat.com> In-Reply-To: <20240315152301.3621858-1-armbru@redhat.com> References: <20240315152301.3621858-1-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=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.933, 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, T_SCC_BODY_TEXT_LINE=-0.01 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: 1710516318254100003 Content-Type: text/plain; charset="utf-8" From: John Snow A QAPISchemaArrayType's element type gets resolved only during .check(). We have QAPISchemaArrayType.__init__() initialize self.element_type =3D None, and .check() assign the actual type. Using .element_type before .check() is wrong, and hopefully crashes due to the value being None. Works. However, it makes for awkward typing. With .element_type: Optional[QAPISchemaType], mypy is of course unable to see that it's None before .check(), and a QAPISchemaType after. To help it over the hump, we'd have to assert self.element_type is not None before all the (valid) uses. The assertion catches invalid uses, but only at run time; mypy can't flag them. Instead, declare .element_type in .__init__() as QAPISchemaType *without* initializing it. Using .element_type before .check() now certainly crashes, which is an improvement. Mypy still can't flag invalid uses, but that's okay. Signed-off-by: John Snow Reviewed-by: Markus Armbruster Signed-off-by: Markus Armbruster --- scripts/qapi/schema.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py index 307f8af01a..48f157fb91 100644 --- a/scripts/qapi/schema.py +++ b/scripts/qapi/schema.py @@ -381,7 +381,7 @@ def __init__(self, name, info, element_type): super().__init__(name, info, None) assert isinstance(element_type, str) self._element_type_name =3D element_type - self.element_type =3D None + self.element_type: QAPISchemaType =20 def need_has_if_optional(self): # When FOO is an array, we still need has_FOO to distinguish --=20 2.44.0