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Date: Thu, 3 Sep 2020 12:21:00 +0100 Message-Id: <20200903112107.27367-2-alex.bennee@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200903112107.27367-1-alex.bennee@linaro.org> References: <20200903112107.27367-1-alex.bennee@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=2a00:1450:4864:20::444; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x444.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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: fam@euphon.net, berrange@redhat.com, stefanb@linux.vnet.ibm.com, =?UTF-8?q?Alex=20Benn=C3=A9e?= , richard.henderson@linaro.org, f4bug@amsat.org, cota@braap.org, stefanha@redhat.com, marcandre.lureau@redhat.com, pbonzini@redhat.com, aurelien@aurel32.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Mention a few of the more common naming conventions we follow in the code base including common variable names and function prefix and suffix examples. Signed-off-by: Alex Benn=C3=A9e --- v2 - punctuation fixes suggested by Cornelia - re-worded section on qemu_ prefix - expanded on _locked suffix v3 - re-order phrasing around qemu_ prefix - drop "while actual..." shortname examples squash! CODING_STYLE.rst: flesh out our naming conventions. --- CODING_STYLE.rst | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) diff --git a/CODING_STYLE.rst b/CODING_STYLE.rst index 427699e0e42..fd8ce9ceaba 100644 --- a/CODING_STYLE.rst +++ b/CODING_STYLE.rst @@ -109,8 +109,35 @@ names are lower_case_with_underscores_ending_with_a_t,= like the POSIX uint64_t and family. Note that this last convention contradicts POSIX and is therefore likely to be changed. =20 -When wrapping standard library functions, use the prefix ``qemu_`` to alert -readers that they are seeing a wrapped version; otherwise avoid this prefi= x. +Variable Naming Conventions +--------------------------- + +A number of short naming conventions exist for variables that use +common QEMU types. For example, the architecture independent CPUState +is often held as a ``cs`` pointer variable, whereas the concrete +CPUArchState is usually held in a pointer called ``env``. + +Likewise, in device emulation code the common DeviceState is usually +called ``dev``. + +Function Naming Conventions +--------------------------- + +The ``qemu_`` prefix is used for utility functions that are widely +called from across the code-base. This includes wrapped versions of +standard library functions (e.g. ``qemu_strtol``) where the prefix is +added to the library function name to alert readers that they are +seeing a wrapped version. + +Public functions from a file or subsystem (declared in headers) tend +to have a consistent prefix to show where they came from. For example, +``tlb_`` for functions from ``cputlb.c`` or ``cpu_`` for functions +from cpus.c. + +If there are two versions of a function to be called with or without a +lock held, the function that expects the lock to be already held +usually uses the suffix ``_locked``. + =20 Block structure =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --=20 2.20.1