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| author | Denis Efremov <efremov@linux.com> | 2020-09-01 12:48:12 +0300 |
|---|---|---|
| committer | Julia Lawall <Julia.Lawall@lip6.fr> | 2020-09-05 19:13:28 +0200 |
| commit | 7c9dc603d55617edcc3190f9a6d7b5cf763feb57 (patch) | |
| tree | 295a94549dabcbd77b92a540cea15de6c9f70aa1 /scripts/coccinelle | |
| parent | 5e0c074e5b4be02d57d1b60abc3391afe7edd088 (diff) | |
| download | lwn-7c9dc603d55617edcc3190f9a6d7b5cf763feb57.tar.gz lwn-7c9dc603d55617edcc3190f9a6d7b5cf763feb57.zip | |
coccinelle: misc: add uninitialized_var.cocci script
uninitialized_var() macro was removed from the sources [1] and
other warning-silencing tricks were deprecated [2]. The purpose of this
cocci script is to prevent new occurrences of uninitialized_var()
open-coded variants.
[1] commit 63a0895d960a ("compiler: Remove uninitialized_var() macro")
[2] commit 4b19bec97c88 ("docs: deprecated.rst: Add uninitialized_var()")
Cc: Kees Cook <keescook@chromium.org>
Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Denis Efremov <efremov@linux.com>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Diffstat (limited to 'scripts/coccinelle')
| -rw-r--r-- | scripts/coccinelle/misc/uninitialized_var.cocci | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/scripts/coccinelle/misc/uninitialized_var.cocci b/scripts/coccinelle/misc/uninitialized_var.cocci new file mode 100644 index 000000000000..8fa845cefe11 --- /dev/null +++ b/scripts/coccinelle/misc/uninitialized_var.cocci @@ -0,0 +1,51 @@ +// SPDX-License-Identifier: GPL-2.0-only +/// +/// Please, don't reintroduce uninitialized_var(). +/// From Documentation/process/deprecated.rst: +/// For any compiler warnings about uninitialized variables, just add +/// an initializer. Using warning-silencing tricks is dangerous as it +/// papers over real bugs (or can in the future), and suppresses unrelated +/// compiler warnings (e.g. "unused variable"). If the compiler thinks it +/// is uninitialized, either simply initialize the variable or make compiler +/// changes. Keep in mind that in most cases, if an initialization is +/// obviously redundant, the compiler's dead-store elimination pass will make +/// sure there are no needless variable writes. +/// +// Confidence: High +// Copyright: (C) 2020 Denis Efremov ISPRAS +// Options: --no-includes --include-headers +// + +virtual context +virtual report +virtual org + +@r@ +identifier var; +type T; +position p; +@@ + +( +* T var =@p var; +| +* T var =@p *(&(var)); +| +* var =@p var +| +* var =@p *(&(var)) +) + +@script:python depends on report@ +p << r.p; +@@ + +coccilib.report.print_report(p[0], + "WARNING this kind of initialization is deprecated (https://www.kernel.org/doc/html/latest/process/deprecated.html#uninitialized-var)") + +@script:python depends on org@ +p << r.p; +@@ + +coccilib.org.print_todo(p[0], + "WARNING this kind of initialization is deprecated (https://www.kernel.org/doc/html/latest/process/deprecated.html#uninitialized-var)") |