linux-kernel - [PATCH v2] Coccinelle: noderef: Add a rule and correct the old rule

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Message-Id: <1462797280-14332-1-git-send-email-vaishali.thakkar@oracle.com>
Date:	Mon,  9 May 2016 18:04:40 +0530
From:	Vaishali Thakkar <vaishali.thakkar@...cle.com>
To:	Julia.Lawall@...6.fr
Cc:	Gilles.Muller@...6.fr, nicolas.palix@...g.fr, mmarek@...e.com,
	cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org,
	Vaishali Thakkar <vaishali.thakkar@...cle.com>
Subject: [PATCH v2] Coccinelle: noderef: Add a rule and correct the old rule

Add a new rule to detect the cases where sizeof is used as a
subexpression rather than a top level argument.

Also, for the patch mode third rule should behave same as
second rule with arguments reversed. So, change that as well.

Signed-off-by: Vaishali Thakkar <vaishali.thakkar@...cle.com>
---
Changes since v1:
	- Declare i as an expression instead of identifier to
	  cover more cases
---
 scripts/coccinelle/misc/noderef.cocci | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/scripts/coccinelle/misc/noderef.cocci b/scripts/coccinelle/misc/noderef.cocci
index 80a831c..584dd01 100644
--- a/scripts/coccinelle/misc/noderef.cocci
+++ b/scripts/coccinelle/misc/noderef.cocci
@@ -16,6 +16,7 @@ virtual patch
 @depends on patch@
 expression *x;
 expression f;
+expression i;
 type T;
 @@
 
@@ -30,7 +31,12 @@ f(...,(T)(x),...,sizeof(
 + *x
    ),...)
 |
-f(...,sizeof(x),...,(T)(
+f(...,sizeof(
+- x
++ *x
+   ),...,(T)(x),...)
+|
+x = f(...,i*sizeof(
 - x
 + *x
    ),...)
@@ -39,6 +45,7 @@ f(...,sizeof(x),...,(T)(
 @r depends on !patch@
 expression *x;
 expression f;
+expression i;
 position p;
 type T;
 @@
@@ -49,6 +56,8 @@ type T;
 *f(...,(T)(x),...,sizeof@p(x),...)
 |
 *f(...,sizeof@p(x),...,(T)(x),...)
+|
+*x = f(...,i*sizeof@p(x),...)
 )
 
 @script:python depends on org@
-- 
2.1.4