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[174.21.70.228]) by smtp.gmail.com with ESMTPSA id o1sm321595pjf.56.2021.06.15.18.36.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Jun 2021 18:36:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ubpKT84c0CDe5YC8xIT/jR9IicZ4W7L/Hmhh3sXO2Cc=; b=ILFtozxev9FMNR5wDAoFKHVkXjZRBp6i2Do8mXlIpcPmGX53Nbrdz8uH6RU7LZGU00 FiXzViB36Wp0FrZ1cV4oxAjMa3mGFFZAOKPlcDl+S7LjKlNzqUJKTADL+DJ8m4ofJJlG Ugj/GqohX/8wSS+NeauEOggsZCyzt/nOWzawrrFmAO0t4hJMnvjbOaXJAUpHEh7Zpzdn 1ZujnVSqiQ2VCScqTDFhPOtDg1gTl0UFg7O5V97vglDNL8zrINLT8o574oH21VYYSVw8 HnAIH8Kik/67PxOfF7BkQkMzs6WRNMOH7nM8d78TYV1NHJlXuvAEoau/Yv/5k8P13VPX 1spg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ubpKT84c0CDe5YC8xIT/jR9IicZ4W7L/Hmhh3sXO2Cc=; b=CYZblGARvr257QWjjnmass2ZxxPOJNfk2384dIXT6cBdAgLmDVVuVAPPx0C00tvp/B Hisczx8xFF0V4EIfW09rEOpAbhkGbazyhRmvAtyMv6JUfRCGPrav5whRNOLaHZ1W5hJR TzYx8rrzJ7fA9umPXZhebo1mxtNbZH4r38KqqUfHKI/8rrLFMwNpPLQE71ypMjWmVlI1 2usbm39WIxQp3Ltb0KTkCbhg4AuIKWfC+hA23he6BboExWeTHG8LN/crfAu+n2PmCaj8 Hty+sSlwk5HaOSDdyfVyaY5jV9gdPC8y+DHruZq6gX4AMcD01iJ3f5giSFST/nqfyZfc 7byw== X-Gm-Message-State: AOAM533+kbclZTwee1ua5avML9fe0x0LXXdquMNwvr2nbZBQeJhTQC+w 6o9fHlqT0KdElU8N9wkB1gC4S2TJaied5g== X-Google-Smtp-Source: ABdhPJwvwnMED2JB8nvuRskfK8TzlIb8QD2aZq6Q917MHrMbFpMawtb/7d4eBO7z9f8CvFRxAAiKTg== X-Received: by 2002:a17:902:a70c:b029:118:7b47:e5bf with SMTP id w12-20020a170902a70cb02901187b47e5bfmr6444952plq.9.1623807394346; Tue, 15 Jun 2021 18:36:34 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PULL 6/8] include/qemu/lockable: Use _Generic instead of QEMU_GENERIC Date: Tue, 15 Jun 2021 18:36:27 -0700 Message-Id: <20210616013629.1458790-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210616013629.1458790-1-richard.henderson@linaro.org> References: <20210616013629.1458790-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=2607:f8b0:4864:20::632; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x632.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=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) This is both more and less complicated than our expansion using __builtin_choose_expr and __builtin_types_compatible_p. The expansion through QEMU_MAKE_LOCKABLE_ doesn't work because we're not emumerating all of the types within the same _Generic, which results in errors about unhandled cases. We must also handle void* explicitly, so that the NULL constant can be used. Signed-off-by: Richard Henderson Tested-by: Alex Benn=C3=A9e Reviewed-by: Alex Benn=C3=A9e Message-Id: <20210614233143.1221879-7-richard.henderson@linaro.org> --- include/qemu/lockable.h | 90 +++++++++++++++++++---------------------- 1 file changed, 41 insertions(+), 49 deletions(-) diff --git a/include/qemu/lockable.h b/include/qemu/lockable.h index b620023141..86db7cb04c 100644 --- a/include/qemu/lockable.h +++ b/include/qemu/lockable.h @@ -24,79 +24,71 @@ struct QemuLockable { QemuLockUnlockFunc *unlock; }; =20 -/* This function gives an error if an invalid, non-NULL pointer type is pa= ssed - * to QEMU_MAKE_LOCKABLE. For optimized builds, we can rely on dead-code = elimination - * from the compiler, and give the errors already at link time. - */ -#if defined(__OPTIMIZE__) && !defined(__SANITIZE_ADDRESS__) -void unknown_lock_type(void *); -#else -static inline void unknown_lock_type(void *unused) -{ - abort(); -} -#endif - static inline __attribute__((__always_inline__)) QemuLockable * qemu_make_lockable(void *x, QemuLockable *lockable) { - /* We cannot test this in a macro, otherwise we get compiler + /* + * We cannot test this in a macro, otherwise we get compiler * warnings like "the address of 'm' will always evaluate as 'true'". */ return x ? lockable : NULL; } =20 -/* Auxiliary macros to simplify QEMU_MAKE_LOCABLE. */ -#define QEMU_LOCK_FUNC(x) ((QemuLockUnlockFunc *) \ - QEMU_GENERIC(x, \ - (QemuMutex *, qemu_mutex_lock), \ - (QemuRecMutex *, qemu_rec_mutex_lock), \ - (CoMutex *, qemu_co_mutex_lock), \ - (QemuSpin *, qemu_spin_lock), \ - unknown_lock_type)) +static inline __attribute__((__always_inline__)) QemuLockable * +qemu_null_lockable(void *x) +{ + if (x !=3D NULL) { + qemu_build_not_reached(); + } + return NULL; +} =20 -#define QEMU_UNLOCK_FUNC(x) ((QemuLockUnlockFunc *) \ - QEMU_GENERIC(x, \ - (QemuMutex *, qemu_mutex_unlock), \ - (QemuRecMutex *, qemu_rec_mutex_unlock), \ - (CoMutex *, qemu_co_mutex_unlock), \ - (QemuSpin *, qemu_spin_unlock), \ - unknown_lock_type)) - -/* In C, compound literals have the lifetime of an automatic variable. +/* + * In C, compound literals have the lifetime of an automatic variable. * In C++ it would be different, but then C++ wouldn't need QemuLockable * either... */ -#define QEMU_MAKE_LOCKABLE_(x) (&(QemuLockable) { \ - .object =3D (x), \ - .lock =3D QEMU_LOCK_FUNC(x), \ - .unlock =3D QEMU_UNLOCK_FUNC(x), \ +#define QML_OBJ_(x, name) (&(QemuLockable) { \ + .object =3D (x), \ + .lock =3D (QemuLockUnlockFunc *) qemu_ ## name ## _lock, \ + .unlock =3D (QemuLockUnlockFunc *) qemu_ ## name ## _unlock \ }) =20 -/* QEMU_MAKE_LOCKABLE - Make a polymorphic QemuLockable +/** + * QEMU_MAKE_LOCKABLE - Make a polymorphic QemuLockable * - * @x: a lock object (currently one of QemuMutex, QemuRecMutex, CoMutex, Q= emuSpin). + * @x: a lock object (currently one of QemuMutex, QemuRecMutex, + * CoMutex, QemuSpin). * * Returns a QemuLockable object that can be passed around * to a function that can operate with locks of any kind, or * NULL if @x is %NULL. - */ -#define QEMU_MAKE_LOCKABLE(x) \ - QEMU_GENERIC(x, \ - (QemuLockable *, (x)), \ - qemu_make_lockable((x), QEMU_MAKE_LOCKABLE_(x))) - -/* QEMU_MAKE_LOCKABLE_NONNULL - Make a polymorphic QemuLockable * - * @x: a lock object (currently one of QemuMutex, QemuRecMutex, CoMutex, Q= emuSpin). + * Note the special case for void *, so that we may pass "NULL". + */ +#define QEMU_MAKE_LOCKABLE(x) \ + _Generic((x), QemuLockable *: (x), \ + void *: qemu_null_lockable(x), \ + QemuMutex *: qemu_make_lockable(x, QML_OBJ_(x, mutex)), \ + QemuRecMutex *: qemu_make_lockable(x, QML_OBJ_(x, rec_mutex))= , \ + CoMutex *: qemu_make_lockable(x, QML_OBJ_(x, co_mutex)), \ + QemuSpin *: qemu_make_lockable(x, QML_OBJ_(x, spin))) + +/** + * QEMU_MAKE_LOCKABLE_NONNULL - Make a polymorphic QemuLockable + * + * @x: a lock object (currently one of QemuMutex, QemuRecMutex, + * CoMutex, QemuSpin). * * Returns a QemuLockable object that can be passed around * to a function that can operate with locks of any kind. */ -#define QEMU_MAKE_LOCKABLE_NONNULL(x) \ - QEMU_GENERIC(x, \ - (QemuLockable *, (x)), \ - QEMU_MAKE_LOCKABLE_(x)) +#define QEMU_MAKE_LOCKABLE_NONNULL(x) \ + _Generic((x), QemuLockable *: (x), \ + QemuMutex *: QML_OBJ_(x, mutex), \ + QemuRecMutex *: QML_OBJ_(x, rec_mutex), \ + CoMutex *: QML_OBJ_(x, co_mutex), \ + QemuSpin *: QML_OBJ_(x, spin)) =20 static inline void qemu_lockable_lock(QemuLockable *x) { --=20 2.25.1