From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757054AbaCEWuN (ORCPT ); Wed, 5 Mar 2014 17:50:13 -0500 Received: from mout.web.de ([212.227.17.12]:56218 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751931AbaCEWuM (ORCPT ); Wed, 5 Mar 2014 17:50:12 -0500 Message-ID: <5317AA20.1080402@users.sourceforge.net> Date: Wed, 05 Mar 2014 23:50:08 +0100 From: SF Markus Elfring User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org CC: Coccinelle , kernel-janitors@vger.kernel.org Subject: Re: [coccicheck Linux 3.14-rc5 PATCH 2 of 5] Deletion of unnecessary checks before specific function calls References: <5307CAA2.8060406@users.sourceforge.net> <530A086E.8010901@users.sourceforge.net> <530A72AA.3000601@users.sourceforge.net> <530B5FB6.6010207@users.sourceforge.net> <530C5E18.1020800@users.sourceforge.net> <530CD2C4.4050903@users.sourceforge.net> <530CF8FF.8080600@users.sourceforge.net> <530DD06F.4090703@users.sourceforge.net> <5317A59D.4@users.sourceforge.net> In-Reply-To: <5317A59D.4@users.sourceforge.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:LYSVznvcWgWIx1F6lxJKlbj6NgPMKw28Dkpq7IDlWUvEPUZLpKu EOkELfCwQ4VkVSDNu2i2a9rz+g+IrkH46dOLcQWX01DGGls39cjWl4r1kHus1MMtw81Ur57 NDGUn3buXbXXL046ZZTb54V0Vhtf9GZmgXDbXkWZx2no61Wa14fCGGRha0/c7cEmJJYWckW Ss7HvjFtMaVrbQ5CCr39w== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >> If you are convinced that dropping the null tests is a good idea, then you >> can submit the patch that makes the change to the relevant maintainers and >> mailing lists. >>From 1d2de3c3cfa43cc3c78a91200c41cef438b26a8f Mon Sep 17 00:00:00 2001 From: Markus Elfring Date: Wed, 5 Mar 2014 18:38:43 +0100 Subject: [PATCH 2/5] Addition of a semantic patch file for listing of functions that check their single parameter This semantic patch pattern tries to find functions that check their single parameter for usability. Example: Null pointer checks are often performed as input parameter validation. It uses Python statements to write information about the found source code places in a data format that is a variant of a CSV text file. Signed-off-by: Markus Elfring --- .../list_input_parameter_validation1.cocci | 55 ++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 scripts/coccinelle/deletions/list_input_parameter_validation1.cocci diff --git a/scripts/coccinelle/deletions/list_input_parameter_validation1.cocci b/scripts/coccinelle/deletions/list_input_parameter_validation1.cocci new file mode 100644 index 0000000..b0a5a52 --- /dev/null +++ b/scripts/coccinelle/deletions/list_input_parameter_validation1.cocci @@ -0,0 +1,55 @@ +@initialize:python@ +@@ +import sys +result = [] +mark = ['"', '', '"'] +delimiter = '|' + +def store_positions(fun, typ, point, places): + """Add source code positions to an internal list.""" + for place in places: + fields = [] + fields.append(fun) + + mark[1] = typ + fields.append(''.join(mark)) + + fields.append(point) + + mark[1] = place.file.replace('"', '""') + fields.append(''.join(mark)) + + fields.append(place.line) + fields.append(str(int(place.column) + 1)) + result.append(delimiter.join(fields)) + +@safety_check@ +identifier work, input; +type data_type; +position pos; +statement is, es; +@@ + void work@pos(data_type input) + { + ... when any +( if (input) is else es +| if (likely(input)) is else es +) + ... when any + } + +@script:python collection depends on safety_check@ +typ << safety_check.data_type; +fun << safety_check.work; +point << safety_check.input; +places << safety_check.pos; +@@ +store_positions(fun, typ, point, places) + +@finalize:python@ +@@ +if result: + result.insert(0, delimiter.join(("function", '"data type"', '"parameter"', '"source file"', "line", "column"))) + print("\r\n".join(result)) +else: + sys.stderr.write("No result for this analysis!\n") -- 1.9.0