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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43d43fdeba1sm48804525e9.32.2025.03.20.06.32.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Mar 2025 06:32:51 -0700 (PDT) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: qemu-rust@nongnu.org, Paolo Bonzini Subject: [PATCH 1/3] rust: assertions: add static_assert Date: Thu, 20 Mar 2025 13:32:46 +0000 Message-ID: <20250320133248.1679485-2-peter.maydell@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250320133248.1679485-1-peter.maydell@linaro.org> References: <20250320133248.1679485-1-peter.maydell@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::331; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x331.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org From: Paolo Bonzini Add a new assertion that is similar to "const { assert!(...) }" but can be used outside functions and with older versions of Rust. A similar macro is found in Linux, whereas the "static_assertions" crate has a const_assert macro that produces worse error messages. Suggested-by: Peter Maydell Supersedes: <20250320113356.799412-1-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini Signed-off-by: Peter Maydell Reviewed-by: Zhao Liu --- rust/qemu-api/src/assertions.rs | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/rust/qemu-api/src/assertions.rs b/rust/qemu-api/src/assertions.rs index 104dec39774..bba38cfda11 100644 --- a/rust/qemu-api/src/assertions.rs +++ b/rust/qemu-api/src/assertions.rs @@ -120,3 +120,25 @@ macro_rules! assert_match { ); }; } + +/// Assert at compile time that an expression is true. This is similar +/// to `const { assert!(...); }` but it works outside functions, as well as +/// on versions of Rust before 1.79. +/// +/// # Examples +/// +/// ``` +/// # use qemu_api::static_assert; +/// static_assert!("abc".len() == 3); +/// ``` +/// +/// ```compile_fail +/// # use qemu_api::static_assert; +/// static_assert!("abc".len() == 2); // does not compile +/// ``` +#[macro_export] +macro_rules! static_assert { + ($x:expr) => { + const _: () = assert!($x); + }; +}