scripts/coccinelle/null/badzero.cocci

Source file repositories/reference/linux-study-clean/scripts/coccinelle/null/badzero.cocci

File Facts

System
Linux kernel
Corpus path
scripts/coccinelle/null/badzero.cocci
Extension
.cocci
Size
3279 bytes
Lines
240
Domain
Support Tooling And Documentation
Bucket
scripts
Inferred role
Support Tooling And Documentation: scripts
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/// Compare pointer-typed values to NULL rather than 0
///
//# This makes an effort to choose between !x and x == NULL.  !x is used
//# if it has previously been used with the function used to initialize x.
//# This relies on type information.  More type information can be obtained
//# using the option -all_includes and the option -I to specify an
//# include path.
//
// Confidence: High
// Copyright: (C) 2012 Julia Lawall, INRIA/LIP6.
// Copyright: (C) 2012 Gilles Muller, INRIA/LiP6.
// URL: https://coccinelle.gitlabpages.inria.fr/website
// Requires: 1.0.0
// Options:

virtual patch
virtual context
virtual org
virtual report

@initialize:ocaml@
@@
let negtable = Hashtbl.create 101

@depends on patch@
expression *E;
identifier f;
@@

(
  (E = f(...)) ==
- 0
+ NULL
|
  (E = f(...)) !=
- 0
+ NULL
|
- 0
+ NULL
  == (E = f(...))
|
- 0
+ NULL
  != (E = f(...))
)


@t1 depends on !patch@
expression *E;
identifier f;
position p;
@@

(
  (E = f(...)) ==
* 0@p
|
  (E = f(...)) !=
* 0@p
|
* 0@p
  == (E = f(...))
|
* 0@p
  != (E = f(...))
)

@script:python depends on org@

Annotation

Implementation Notes