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d="scan'208";a="126988517" From: Zhao Liu To: Paolo Bonzini Cc: qemu-devel@nongnu.org, qemu-rust@nongnu.org, Zhao Liu Subject: [PATCH 07/17] rust/vmstate: Fix type check for varray in vmstate_struct Date: Mon, 17 Mar 2025 23:12:26 +0800 Message-Id: <20250317151236.536673-8-zhao1.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250317151236.536673-1-zhao1.liu@intel.com> References: <20250317151236.536673-1-zhao1.liu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=192.198.163.10; envelope-from=zhao1.liu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -46 X-Spam_score: -4.7 X-Spam_bar: ---- X-Spam_report: (-4.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.335, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=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 @intel.com) X-ZM-MESSAGEID: 1742223984088019000 Content-Type: text/plain; charset="utf-8" When pass a varray to vmstate_struct, the `type` parameter should be the type of the element in the varray, for example: vmstate_struct!(HPETState, timers, [0 .. num_timers], VMSTATE_HPET_TIMER, BqlRefCell, version =3D 0) But this breaks current type check, because it checks the type of `field`, which is an array type (for the above example, type of timers is [BqlRefCell; 32], not BqlRefCell). But the current assert_field_type() can no longer be extended to include new arguments, so a variant of it (a second macro containing the `num =3D $num:ident` parameter) had to be added to handle array cases. In this new macro, it not only checks the type of element, but also checks whether the `num` (number of elements in varray) is out of range. Signed-off-by: Zhao Liu --- rust/qemu-api/src/assertions.rs | 15 +++++++++++++++ rust/qemu-api/src/vmstate.rs | 2 +- 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/rust/qemu-api/src/assertions.rs b/rust/qemu-api/src/assertions= .rs index 104dec39774e..176060e32acd 100644 --- a/rust/qemu-api/src/assertions.rs +++ b/rust/qemu-api/src/assertions.rs @@ -91,6 +91,21 @@ fn types_must_be_equal(_: T) } }; }; + + ($t:ty, $i:tt, $ti:ty, num =3D $num:ident) =3D> { + const _: () =3D { + #[allow(unused)] + fn assert_field_type(v: $t) { + fn types_must_be_equal(_: T) + where + T: $crate::assertions::EqType, + { + } + let index: usize =3D v.$num.try_into().unwrap(); + types_must_be_equal::<_, &$ti>(&v.$i[index]); + } + }; + }; } =20 /// Assert that an expression matches a pattern. This can also be diff --git a/rust/qemu-api/src/vmstate.rs b/rust/qemu-api/src/vmstate.rs index 5af75b4777e9..8adef175634a 100644 --- a/rust/qemu-api/src/vmstate.rs +++ b/rust/qemu-api/src/vmstate.rs @@ -447,7 +447,7 @@ macro_rules! vmstate_struct { .as_ptr() as *const ::std::os::raw::c_char, $(num_offset: $crate::offset_of!($struct_name, $num),)? offset: { - $crate::assert_field_type!($struct_name, $field_name, $typ= e); + $crate::assert_field_type!($struct_name, $field_name, $typ= e $(, num =3D $num)?); $crate::offset_of!($struct_name, $field_name) }, size: ::core::mem::size_of::<$type>(), --=20 2.34.1