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authorJoe Perches <joe@perches.com>2014-10-13 15:51:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-14 02:18:15 +0200
commit08a2843e77fc581d204c1e83de4678b746cdbd6e (patch)
treee1cddaa649c00e4181f19c01d76fead28b5af8e0 /scripts
parentd2207ccbc59900311c88bb9150b24253cd4ddd49 (diff)
downloadlinux-08a2843e77fc581d204c1e83de4678b746cdbd6e.tar.gz
checkpatch: warn on macros with flow control statements
Macros with flow control statements (goto and return) are not very nice to read as any flow movement is unexpected. Try to highlight them and emit a warning on their definition. Avoid warning on macros that use argument concatenation as those macros commonly create another function where the concatenation is used in the function name definition like: #define FOO_FUNC(name, rtn_type) \ rtn_type func##name(arg1, ...) \ { \ rtn_type rtn; \ [code...] \ return rtn; \ } Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/checkpatch.pl18
1 files changed, 18 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 0c520f7bf09..7a360a8c1b9 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4066,12 +4066,17 @@ sub process {
my $cnt = $realcnt;
my ($off, $dstat, $dcond, $rest);
my $ctx = '';
+ my $has_flow_statement = 0;
+ my $has_arg_concat = 0;
($dstat, $dcond, $ln, $cnt, $off) =
ctx_statement_block($linenr, $realcnt, 0);
$ctx = $dstat;
#print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
#print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
+ $has_flow_statement = 1 if ($ctx =~ /\b(goto|return)\b/);
+ $has_arg_concat = 1 if ($ctx =~ /\#\#/);
+
$dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
$dstat =~ s/$;//g;
$dstat =~ s/\\\n.//g;
@@ -4136,6 +4141,19 @@ sub process {
}
}
+# check for macros with flow control, but without ## concatenation
+# ## concatenation is commonly a macro that defines a function so ignore those
+ if ($has_flow_statement && !$has_arg_concat) {
+ my $herectx = $here . "\n";
+ my $cnt = statement_rawlines($ctx);
+
+ for (my $n = 0; $n < $cnt; $n++) {
+ $herectx .= raw_line($linenr, $n) . "\n";
+ }
+ WARN("MACRO_WITH_FLOW_CONTROL",
+ "Macros with flow control statements should be avoided\n" . "$herectx");
+ }
+
# check for line continuations outside of #defines, preprocessor #, and asm
} else {