From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46A5CC432C1 for ; Wed, 25 Sep 2019 11:34:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0BC2B21D79 for ; Wed, 25 Sep 2019 11:34:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=web.de header.i=@web.de header.b="lz32pc4C" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404891AbfIYLeE (ORCPT ); Wed, 25 Sep 2019 07:34:04 -0400 Received: from mout.web.de ([217.72.192.78]:52901 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404839AbfIYLeD (ORCPT ); Wed, 25 Sep 2019 07:34:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=dbaedf251592; t=1569411227; bh=NsRWT3m7m/8+7vkXK4b1o5yrRK0tkUYm+dA7R0wuV6A=; h=X-UI-Sender-Class:Subject:To:References:From:Cc:Date:In-Reply-To; b=lz32pc4CdqnMGsa4ZeoxHWMM8N9SJD0yHOb084nAHSgC9VQ9OMzq5OU711Bp7GQGS vbGxrwOADtqZZ7DZTQGW9nIHHdAlH+WaoPQW0g6ne0ChIxnmJbbLbrOPxg9stNqC9E gtaj7SaY0MEGXxfrL5xZnmEVSq1xzXqhP3ctrFcw= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Received: from [192.168.1.2] ([2.244.110.103]) by smtp.web.de (mrweb101 [213.165.67.124]) with ESMTPSA (Nemesis) id 0Lky6L-1herGQ33Ir-00apwU; Wed, 25 Sep 2019 13:33:47 +0200 Subject: [PATCH] Coccinelle: Add a SmPL script for the reconsideration of specific combinations of assignment and return statements To: Julia Lawall , Coccinelle , kernel-janitors@vger.kernel.org, Gilles Muller , Masahiro Yamada , Michal Marek , Nicolas Palix References: From: Markus Elfring Autocrypt: addr=Markus.Elfring@web.de; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:EwTs9UJltyX2v3e1ohEUFhC6AdX2g8jdVWxcaI83dCHfGo3w7kE NXLr0nOGm3Wi1/84FH3EXIi/+6GwG3SPOfckY2MFSAT4MJNT/ABYvOMGU73Uic0UGm8u0on w+F+Amqaga9KwJ6Vn7nHXSiRefB4CMzmRjS+5z2xz6nbDQQQ6dljmwz3cZAgo3gTwFCZtLm VHIo2Yjnk7ugyNaA6xOVg== X-UI-Out-Filterresults: notjunk:1;V03:K0:dLgVQPprfqs=:xSdh97M46cEoSbObqHiWQ5 M2PN/KEFK4DxVwJyUagxpVEogWdQq1PuO3KIaCSeQwCPjxzAtKz1eEEs/KdoygRyXJnYQtHD8 d2lagvihgMNUPvKN8LX/+Ef5iPRWpubXh2Y/anfsyq8JaCEWmqY6Cyi2cSJIDEFMDNbbZ66Dc fWsbQAaptqaVPXpnIklZMJn3NmyV4rUkADk4h1wAIWOQU7g0cj3eucJmQ02FmszhRPT07p1m+ od4u72tCS42v2jXRU1eZXtsmkL5vdDncWtuI9sVDS+LElvovjWrVuJw4HFba9kN2H3V5ZYfyx bgMe7oA65xnC6uZxWtHgICB7MQOzI0qV6V7fuJ/ZiMlYJ2TMpPXGSOTzAAJKeF/SgJvzHhQC0 nqSblpe/09lemLrGzFLU5qJo4xTb9pFDi5frM8uFpOLH9uIMNVTEdqy8aZ1ZTxHD3aqaKNUSL Uz7b/EBXMHcaP7O3gwuKenC20dj3B/HCSRDK5m7bs/hvGCXG1BQk51RD9eiXF9QM1QxaqVw+i a8EYcQYiHoHKDepJiWSnmmieTT8bP0d1XeHaX658Y6aavQAVEwNLe+t8AyezcYVei+PmP7ReL UN49a95iX+3idryjYUjJmumvw2+ZbhWjNvgS4pkNcUjsGQKgOBrgumTeT5tqu5OTWT17EFtII mFhbCXdsTwLWU52kX+haPxb7ZblR5iRs24fRVV9BIg89gurbpfQUra9dOsvizFL2+hr3aAQ/s pGFlDrtmSyL6UvxX+pyA88KZZRLEp+jzBqv+b6FbhfngEbjhClutloPYq0Warl/8HAGI/dO/Q 53LnFmIqJxaokFtI74T3FxT7/utqLEmxM8v7hZC4d8j5bZdx8UfzeZub3WlXmNFpJox/avxTN N+PYLxztWsSs4LiRI2au8gEPascXcjMX4/uuil7honQgJ1ZUEgAoATIfsUHoMamhLiHLi03If 3DhUR5MbzdE2fFvom47up5De2ByY/DPGAppo4QIsVk7u6yS4fzHh8Cxo1kJNEK3pVzHCAA0Mw vbUrghRl5sydFvD+VaQ5LqZSADqWCvfgtId3dGNI8/aSHQXHjLqfb1RW588Y/upYYLPT8CWmX 5ITgvVU3Zv74LJi1tC++KUS5aJ/aORprVN/+jaSnVvCgjXjGBANwmPVGHkEOS2xmMN3nSoSBb yd8s1hqCt5rwCnMip2LTYhJHBHXcppL+4FqcQGTJpxVl1lCclXvmZ3nLGq4N9AKFXjLswDiZL gr61luvIpClgjyvHSNOroEIK1x6dpbCpiIlADzuivhLdmkiVZ4bAuLZYvOYc= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Markus Elfring Date: Wed, 25 Sep 2019 11:55:24 +0200 Values from expressions were occasionally assigned to local variables before they will be returned by the subsequent statement. Such expressions can be directly specified in the return statement instead= . Adjust affected source code by the means of the semantic patch language (Coccinelle software). Signed-off-by: Markus Elfring =2D-- .../coccinelle/misc/move_code_to_return.cocci | 67 +++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 scripts/coccinelle/misc/move_code_to_return.cocci diff --git a/scripts/coccinelle/misc/move_code_to_return.cocci b/scripts/c= occinelle/misc/move_code_to_return.cocci new file mode 100644 index 000000000000..78cdf84f9aaa =2D-- /dev/null +++ b/scripts/coccinelle/misc/move_code_to_return.cocci @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0 +/// Return expressions directly instead of assigning them to +/// local variables immediately before affected statements. +// +// Keywords: return statements variable assignments coding style +// Confidence: Medium + +virtual patch + +@replacement1 depends on patch@ +expression x; +identifier f, rc; +local idexpression lrc; +type rt; +@@ + rt f(...) + { + ... when any + if (...) +-{ +-lrc@rc =3D x; + return +- rc ++ x + ; +-} + ... when any + } + +@replacement2 depends on patch@ +expression x; +identifier f, rc; +local idexpression lrc; +type rt; +@@ + rt f(...) + { + ... when any +-lrc@rc =3D x; + return +- rc ++ x + ; + ... when any + } + +@deletion2 depends on patch@ +identifier replacement2.f, replacement2.rc; +type replacement2.rt, t; +@@ + rt f(...) + { + ... when any +-t rc; + ... when !=3D rc + } + +@deletion1 depends on patch@ +identifier replacement1.f, replacement1.rc; +type replacement1.rt, t; +@@ + rt f(...) + { + ... when any +-t rc; + ... when !=3D rc + } =2D- 2.23.0