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Subject[PATCH v2] coccinelle: add style check for assignment in if
Date
Add a semantic patch for fixing some cases of checkpatch.pl error:

ERROR: do not use assignment in if condition

Signed-off-by: Kris Borer <kborer@gmail.com>
---
scripts/coccinelle/style/assignment_in_if.cocci | 128 ++++++++++++++++++++++++
1 file changed, 128 insertions(+)
create mode 100644 scripts/coccinelle/style/assignment_in_if.cocci

diff --git a/scripts/coccinelle/style/assignment_in_if.cocci b/scripts/coccinelle/style/assignment_in_if.cocci
new file mode 100644
index 0000000..b23db8f
--- /dev/null
+++ b/scripts/coccinelle/style/assignment_in_if.cocci
@@ -0,0 +1,128 @@
+/// move assignments out of if conditions
+///
+//# This script is designed to correct code where assignments exist in if
+//# conditions. It is only capable of handling a subset of such problems.
+//# Ideally it would handle all checkpatch errors of the following type:
+//# ERROR: do not use assignment in if condition
+//#
+//# For example:
+//# if(result = myfun())
+//#
+//# would become:
+//# result = myfun();
+//# if(result)
+//
+// Confidence: Moderate
+// Copyright: (C) 2015 Kris Borer. GPLv2.
+// URL: http://coccinelle.lip6.fr/
+// Comments:
+// Options: --no-includes --include-headers
+
+virtual patch
+
+
+// if ( (ret = call()) )
+// if ( (ret = call()) < 0 )
+@if1@
+expression i;
+expression E, E2;
+statement S1, S2;
+binary operator b;
+@@
+
++ i = E;
+ if (
+(
+- (i = E)
++ i
+|
+- (i = E)
++ i
+ b ...
+|
+- (i = E),
+ E2
+)
+ ) S1 else S2
+
+
+// if ( ptr->fun && (ret = ptr->fun()) )
+@if2@
+expression i2;
+expression E1, E2;
+@@
+
++ if( E1 ) {
++ i2 = E2;
++ if (i2) {
+- if( E1 && (i2 = E2) ) {
+ ...
+- }
++ }
++ }
+
+
+// if ( ptr->fun && (ret = ptr->fun()) < 0 )
+@if3@
+expression i2;
+expression E1, E2;
+constant c;
+binary operator b;
+@@
+
++ if( E1 ) {
++ i2 = E2;
++ if (i2 b c) {
+- if( E1 && ((i2 = E2) b c) ) {
+ ...
+- }
++ }
++ }
+
+
+// if ( (ret = call()) && ret != -1 )
+// if ( (ret = call()) < 0 && ret != -1 )
+@if4@
+expression i;
+expression E, E2;
+statement S1, S2;
+binary operator b;
+@@
+
++ i = E;
+ if (
+(
+- (i = E)
++ i
+|
+ (
+- (i = E)
++ i
+ b
+ ...)
+)
+ && E2 ) S1 else S2
+
+
+// if ( (ret = call()) && ret != -1 && ret != -2 )
+// if ( (ret = call()) < 0 && ret != -1 && ret != -2 )
+@if5@
+expression i;
+expression E, E2, E3;
+statement S1, S2;
+binary operator b;
+@@
+
++ i = E;
+ if (
+(
+- (i = E)
++ i
+|
+ (
+- (i = E)
++ i
+ b
+ ...)
+)
+ && E2 && E3 ) S1 else S2
--
1.9.1
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