linux-kernel - [PATCHv2] coccinelle: Add a script to find unnecessary ifs with no body

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Date:	Sat, 2 Nov 2013 08:15:01 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Michal Marek <mmarek@...e.cz>, linux-kernel@...r.kernel.org,
	cocci@...teme.lip6.fr
Subject: [PATCHv2] coccinelle: Add a script to find unnecessary ifs with no
 body

This script finds code like this, with an unnecessary if:

if (foo) {}

Provides report mode only, since patching often eliminates conditionals
that contain TODO comments or similar.

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---

v2: Drop patch mode.

 scripts/coccinelle/misc/unnecessary-if.cocci | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 scripts/coccinelle/misc/unnecessary-if.cocci

diff --git a/scripts/coccinelle/misc/unnecessary-if.cocci b/scripts/coccinelle/misc/unnecessary-if.cocci
new file mode 100644
index 0000000..28ac895
--- /dev/null
+++ b/scripts/coccinelle/misc/unnecessary-if.cocci
@@ -0,0 +1,23 @@
+/// Find unnecessary ifs with no statements.
+//
+// Report mode only, since patch mode often deletes ifs that contain TODO
+// comments.
+//
+// Confidence: High
+// Options: --no-includes --include-headers
+
+virtual report
+virtual context
+
+@r depends on report || context@
+expression E;
+position p;
+@@
+if@p (E) {}
+
+@...ipt:python depends on report@
+p << r.p;
+@@
+
+msg = "WARNING: Unnecessary if with no body."
+coccilib.report.print_report(p[0], msg)
-- 
1.8.4.2

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