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Diffstat (limited to 'scripts/coccinelle/misc/flexible_array.cocci')
| -rw-r--r-- | scripts/coccinelle/misc/flexible_array.cocci | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/scripts/coccinelle/misc/flexible_array.cocci b/scripts/coccinelle/misc/flexible_array.cocci new file mode 100644 index 000000000..f427fd68e --- /dev/null +++ b/scripts/coccinelle/misc/flexible_array.cocci @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0-only +/// +/// Zero-length and one-element arrays are deprecated, see +/// Documentation/process/deprecated.rst +/// Flexible-array members should be used instead. +/// +// +// Confidence: High +// Copyright: (C) 2020 Denis Efremov ISPRAS. +// Comments: +// Options: --no-includes --include-headers + +virtual context +virtual report +virtual org +virtual patch + +@initialize:python@ +@@ +def relevant(positions): + for p in positions: + if "uapi" in p.file: + return False + return True + +@r depends on !patch@ +identifier name, array; +type T; +position p : script:python() { relevant(p) }; +@@ + +( + struct name { + ... +* T array@p[\(0\|1\)]; + }; +| + struct { + ... +* T array@p[\(0\|1\)]; + }; +| + union name { + ... +* T array@p[\(0\|1\)]; + }; +| + union { + ... +* T array@p[\(0\|1\)]; + }; +) + +@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 {@q + ... + T array@p[ +- 0 + ]; + }; +| + struct {@q + ... + T array@p[ +- 0 + ]; + }; +) + +@script: python depends on report@ +p << r.p; +@@ + +msg = "WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)" +coccilib.report.print_report(p[0], msg) + +@script: python depends on org@ +p << r.p; +@@ + +msg = "WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)" +coccilib.org.print_todo(p[0], msg) |