Commit 08a2843e authored by Joe Perches's avatar Joe Perches Committed by Linus Torvalds

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: default avatarJoe Perches <joe@perches.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d2207ccb
......@@ -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 {
......
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