[Cocci] [PATCH] coccinelle: misc: restrict patch mode in flexible_array.cocci

[Cocci] [PATCH] coccinelle: misc: restrict patch mode in flexible_array.cocci

[Denis Efremov]

Skip patches generation for structs/unions with a single field.
Changing a zero-length array to a flexible array member in a struct
with no named members breaks the compilation. However, reporting
such cases is still valuable, e.g. commit 637464c59e0b
("ACPI: NFIT: Fix flexible_array.cocci warnings").

Signed-off-by: Denis Efremov <efremov@linux.com>
---
 scripts/coccinelle/misc/flexible_array.cocci | 23 ++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/scripts/coccinelle/misc/flexible_array.cocci b/scripts/coccinelle/misc/flexible_array.cocci
index 947fbaff82a9..f427fd68ed2d 100644
--- a/scripts/coccinelle/misc/flexible_array.cocci
+++ b/scripts/coccinelle/misc/flexible_array.cocci
@@ -51,21 +51,40 @@ position p : script:python() { relevant(p) };
   };
 )
 
+@only_field depends on patch@
+identifier name, array;
+type T;
+position q;
+@@
+
+(
+  struct name {@q
+    T array[0];
+  };
+|
+  struct {@q
+    T array[0];
+  };
+)
+
 @depends on patch@
 identifier name, array;
 type T;
 position p : script:python() { relevant(p) };
+// position @q with rule "only_field" simplifies
+// handling of bitfields, arrays, etc.
+position q != only_field.q;
 @@
 
 (
-  struct name {
+  struct name {@q
     ...
     T array@p[
 -       0
     ];
   };
 |
-  struct {
+  struct {@q
     ...
     T array@p[
 -       0
-- 
2.26.2

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Re: [Cocci] [PATCH] coccinelle: misc: restrict patch mode in flexible_array.cocci

[Julia Lawall]

On Mon, 8 Mar 2021, Denis Efremov wrote:

> Skip patches generation for structs/unions with a single field.
> Changing a zero-length array to a flexible array member in a struct
> with no named members breaks the compilation. However, reporting
> such cases is still valuable, e.g. commit 637464c59e0b
> ("ACPI: NFIT: Fix flexible_array.cocci warnings").
>
> Signed-off-by: Denis Efremov <efremov@linux.com>

Applied.  I changed the log message to remove "/unions", since the change
doesn't mention unions.

julia

> ---
>  scripts/coccinelle/misc/flexible_array.cocci | 23 ++++++++++++++++++--
>  1 file changed, 21 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/coccinelle/misc/flexible_array.cocci b/scripts/coccinelle/misc/flexible_array.cocci
> index 947fbaff82a9..f427fd68ed2d 100644
> --- a/scripts/coccinelle/misc/flexible_array.cocci
> +++ b/scripts/coccinelle/misc/flexible_array.cocci
> @@ -51,21 +51,40 @@ position p : script:python() { relevant(p) };
>    };
>  )
>
> +@only_field depends on patch@
> +identifier name, array;
> +type T;
> +position q;
> +@@
> +
> +(
> +  struct name {@q
> +    T array[0];
> +  };
> +|
> +  struct {@q
> +    T array[0];
> +  };
> +)
> +
>  @depends on patch@
>  identifier name, array;
>  type T;
>  position p : script:python() { relevant(p) };
> +// position @q with rule "only_field" simplifies
> +// handling of bitfields, arrays, etc.
> +position q != only_field.q;
>  @@
>
>  (
> -  struct name {
> +  struct name {@q
>      ...
>      T array@p[
>  -       0
>      ];
>    };
>  |
> -  struct {
> +  struct {@q
>      ...
>      T array@p[
>  -       0
> --
> 2.26.2
>
>
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