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| author | Peter Senna Tschudin <peter.senna@gmail.com> | 2014-06-01 20:12:31 +0200 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2014-06-10 14:36:30 +0200 |
| commit | 90829adb4a8ea3b007bd8c63f5b54fddb7972bec (patch) | |
| tree | e152dd1c1c60a91dd339913ee5f9793fe887f7e2 /scripts | |
| parent | kbuild: Fix a typo in documentation (diff) | |
| download | linux-90829adb4a8ea3b007bd8c63f5b54fddb7972bec.tar.xz linux-90829adb4a8ea3b007bd8c63f5b54fddb7972bec.zip | |
coccicheck: Add unneeded return variable test
This semantic patch looks for variables that are initialized with a
constant, are never updated, and are only used as parameter of return.
Return the constant instead of using a variable.
Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/coccinelle/misc/returnvar.cocci | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/scripts/coccinelle/misc/returnvar.cocci b/scripts/coccinelle/misc/returnvar.cocci new file mode 100644 index 000000000000..605955a91c44 --- /dev/null +++ b/scripts/coccinelle/misc/returnvar.cocci @@ -0,0 +1,66 @@ +/// +/// Removes unneeded variable used to store return value. +/// +// Confidence: Moderate +// Copyright: (C) 2012 Peter Senna Tschudin, INRIA/LIP6. GPLv2. +// URL: http://coccinelle.lip6.fr/ +// Comments: Comments on code can be deleted if near code that is removed. +// "when strict" can be removed to get more hits, but adds false +// positives +// Options: --no-includes --include-headers + +virtual patch +virtual report +virtual context +virtual org + +@depends on patch@ +type T; +constant C; +identifier ret; +@@ +- T ret = C; +... when != ret + when strict +return +- ret ++ C +; + +@depends on context@ +type T; +constant C; +identifier ret; +@@ +* T ret = C; +... when != ret + when strict +* return ret; + +@r1 depends on report || org@ +type T; +constant C; +identifier ret; +position p1, p2; +@@ +T ret@p1 = C; +... when != ret + when strict +return ret@p2; + +@script:python depends on report@ +p1 << r1.p1; +p2 << r1.p2; +C << r1.C; +ret << r1.ret; +@@ +coccilib.report.print_report(p1[0], "Unneeded variable: \"" + ret + "\". Return \"" + C + "\" on line " + p2[0].line) + +@script:python depends on org@ +p1 << r1.p1; +p2 << r1.p2; +C << r1.C; +ret << r1.ret; +@@ +cocci.print_main("unneeded \"" + ret + "\" variable", p1) +cocci.print_sec("return " + C + " here", p2) |