Re: [PATCH] emacs compile window support for checkpatch version .10

From: Andy Whitcroft
Date: Fri Sep 21 2007 - 10:35:04 EST

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In reply to: Mike Day: "[PATCH] emacs compile window support for checkpatch version .10"
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On Mon, Sep 17, 2007 at 03:32:49PM -0400, Mike Day wrote:
> Adds support to checkpatch.pl for running in the emacs compile window.
> This allows emacs users to jump from the error in the compile window
> directly to the offending line in the patch.

Can you test the attached checkpatch.pl and tell me if it does what you
need? I refactored it a bit applying it.

-apw

=== 8< ===
#!/usr/bin/perl -w
# (c) 2001, Dave Jones. <davej@xxxxxxxxxxxxxxxxx> (the file handling bit)
# (c) 2005, Joel Schopp <jschopp@xxxxxxxxxxxxxx> (the ugly bit)
# (c) 2007, Andy Whitcroft <apw@xxxxxxxxxx> (new conditions, test suite, etc)
# Licensed under the terms of the GNU GPL License version 2

use strict;

my $P = $0;
$P =~ s@.*/@@g;

my $V = '0.11-rc1';

use Getopt::Long qw(:config no_auto_abbrev);

my $quiet = 0;
my $tree = 1;
my $chk_signoff = 1;
my $chk_patch = 1;
my $tst_type = 0;
my $emacs = 0;
GetOptions(
'q|quiet' => \$quiet,
'tree!' => \$tree,
'signoff!' => \$chk_signoff,
'patch!' => \$chk_patch,
'test-type!' => \$tst_type,
'emacs!' => \$emacs,
) or exit;

my $exit = 0;

if ($#ARGV < 0) {
print "usage: $P [options] patchfile\n";
print "version: $V\n";
print "options: -q => quiet\n";
print " --no-tree => run without a kernel tree\n";
print " --emacs => emacs compile window format\n";
exit(1);
}

if ($tree && !top_of_kernel_tree()) {
print "Must be run from the top-level dir. of a kernel tree\n";
exit(2);
}

my @dep_includes = ();
my @dep_functions = ();
my $removal = 'Documentation/feature-removal-schedule.txt';
if ($tree && -f $removal) {
open(REMOVE, "<$removal") || die "$P: $removal: open failed - $!\n";
while (<REMOVE>) {
if (/^Check:\s+(.*\S)/) {
for my $entry (split(/[, ]+/, $1)) {
if ($entry =~ m@include/(.*)@) {
push(@dep_includes, $1);

} elsif ($entry !~ m@/@) {
push(@dep_functions, $entry);
}
}
}
}
}

my @rawlines = ();
while (<>) {
chomp;
push(@rawlines, $_);
if (eof(ARGV)) {
if (!process($ARGV, @rawlines)) {
$exit = 1;
}
@rawlines = ();
}
}

exit($exit);

sub top_of_kernel_tree {
if ((-f "COPYING") && (-f "CREDITS") && (-f "Kbuild") &&
(-f "MAINTAINERS") && (-f "Makefile") && (-f "README") &&
(-d "Documentation") && (-d "arch") && (-d "include") &&
(-d "drivers") && (-d "fs") && (-d "init") && (-d "ipc") &&
(-d "kernel") && (-d "lib") && (-d "scripts")) {
return 1;
}
return 0;
}

sub expand_tabs {
my ($str) = @_;

my $res = '';
my $n = 0;
for my $c (split(//, $str)) {
if ($c eq "\t") {
$res .= ' ';
$n++;
for (; ($n % 8) != 0; $n++) {
$res .= ' ';
}
next;
}
$res .= $c;
$n++;
}

return $res;
}

sub line_stats {
my ($line) = @_;

# Drop the diff line leader and expand tabs
$line =~ s/^.//;
$line = expand_tabs($line);

# Pick the indent from the front of the line.
my ($white) = ($line =~ /^(\s*)/);

return (length($line), length($white));
}

sub sanitise_line {
my ($line) = @_;

my $res = '';
my $l = '';

my $quote = '';

foreach my $c (split(//, $line)) {
if ($l ne "\\" && ($c eq "'" || $c eq '"')) {
if ($quote eq '') {
$quote = $c;
$res .= $c;
$l = $c;
next;
} elsif ($quote eq $c) {
$quote = '';
}
}
if ($quote && $c ne "\t") {
$res .= "X";
} else {
$res .= $c;
}

$l = $c;
}

return $res;
}

sub ctx_block_get {
my ($linenr, $remain, $outer, $open, $close, $off) = @_;
my $line;
my $start = $linenr - 1;
my $blk = '';
my @o;
my @c;
my @res = ();

my $level = 0;
for ($line = $start; $remain > 0; $line++) {
next if ($rawlines[$line] =~ /^-/);
$remain--;

$blk .= $rawlines[$line];
foreach my $c (split(//, $rawlines[$line])) {
##print "C<$c>L<$level><$open$close>O<$off>\n";
if ($off > 0) {
$off--;
next;
}

if ($c eq $close && $level > 0) {
$level--;
last if ($level == 0);
} elsif ($c eq $open) {
$level++;
}
}

if (!$outer || $level <= 1) {
push(@res, $rawlines[$line]);
}

last if ($level == 0);
}

return ($level, @res);
}
sub ctx_block_outer {
my ($linenr, $remain) = @_;

my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
return @r;
}
sub ctx_block {
my ($linenr, $remain) = @_;

my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
return @r;
}
sub ctx_statement {
my ($linenr, $remain, $off) = @_;

my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
return @r;
}
sub ctx_block_level {
my ($linenr, $remain) = @_;

return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
}
sub ctx_statement_level {
my ($linenr, $remain, $off) = @_;

return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
}

sub ctx_locate_comment {
my ($first_line, $end_line) = @_;

# Catch a comment on the end of the line itself.
my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*$@);
return $current_comment if (defined $current_comment);

# Look through the context and try and figure out if there is a
# comment.
my $in_comment = 0;
$current_comment = '';
for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
my $line = $rawlines[$linenr - 1];
#warn " $line\n";
if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
$in_comment = 1;
}
if ($line =~ m@/\*@) {
$in_comment = 1;
}
if (!$in_comment && $current_comment ne '') {
$current_comment = '';
}
$current_comment .= $line . "\n" if ($in_comment);
if ($line =~ m@\*/@) {
$in_comment = 0;
}
}

chomp($current_comment);
return($current_comment);
}
sub ctx_has_comment {
my ($first_line, $end_line) = @_;
my $cmt = ctx_locate_comment($first_line, $end_line);

##print "LINE: $rawlines[$end_line - 1 ]\n";
##print "CMMT: $cmt\n";

return ($cmt ne '');
}

sub ctx_expr_before {
my ($line) = @_;

##print "CHECK<$line>\n";

my $pos = length($line) - 1;
my $count = 0;
my $c;

for (; $pos >= 0; $pos--) {
$c = substr($line, $pos, 1);
##print "CHECK: c<$c> count<$count>\n";
if ($c eq ')') {
$count++;
} elsif ($c eq '(') {
last if (--$count == 0);
}
}

##print "CHECK: result<" . substr($line, 0, $pos) . ">\n";

return substr($line, 0, $pos);
}

sub cat_vet {
my ($vet) = @_;
my ($res, $coded);

$res = '';
while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
$res .= $1;
if ($2 ne '') {
$coded = sprintf("^%c", unpack('C', $2) + 64);
$res .= $coded;
}
}
$res =~ s/$/\$/;

return $res;
}

my $prefix = '';

my @report = ();
sub report {
push(@report, $prefix . $_[0]);
}
sub report_dump {
@report;
}
sub ERROR {
report("ERROR: $_[0]\n");
our $clean = 0;
}
sub WARN {
report("WARNING: $_[0]\n");
our $clean = 0;
}
sub CHK {
report("CHECK: $_[0]\n");
our $clean = 0;
}

sub process {
my $filename = shift;
my @lines = @_;

my $linenr=0;
my $prevline="";
my $stashline="";

my $length;
my $indent;
my $previndent=0;
my $stashindent=0;

our $clean = 1;
my $signoff = 0;
my $is_patch = 0;

# Trace the real file/line as we go.
my $realfile = '';
my $realline = 0;
my $realcnt = 0;
my $here = '';
my $in_comment = 0;
my $first_line = 0;

my $Ident = qr{[A-Za-z\d_]+};
my $Storage = qr{extern|static|asmlinkage};
my $Sparse = qr{
__user|
__kernel|
__force|
__iomem|
__must_check|
__init_refok|
fastcall
}x;
my $Attribute = qr{
const|
__read_mostly|
__(?:mem|cpu|dev|)(?:initdata|init)
}x;
my $Inline = qr{inline|__always_inline|noinline};
my $NonptrType = qr{
\b
(?:const\s+)?
(?:unsigned\s+)?
(?:
void|
char|
short|
int|
long|
unsigned|
float|
double|
bool|
long\s+int|
long\s+long|
long\s+long\s+int|
u8|u16|u32|u64|
s8|s16|s32|s64|
struct\s+$Ident|
union\s+$Ident|
enum\s+$Ident|
${Ident}_t
)
(?:\s+$Sparse)*
\b
}x;
my $Type = qr{
\b$NonptrType\b
(?:\s*\*+\s*const|\s*\*+|(?:\s*\[\s*\])+)?
(?:\s+$Sparse|\s+$Attribute)*
}x;
my $Declare = qr{(?:$Storage\s+)?$Type};
my $Member = qr{->$Ident|\.$Ident|\[[^]]*\]};
my $Lval = qr{$Ident(?:$Member)*};

# Possible bare types.
my @bare = ();
my $Bare = $NonptrType;

# Pre-scan the patch looking for any __setup documentation.
my @setup_docs = ();
my $setup_docs = 0;
foreach my $line (@lines) {
if ($line=~/^\+\+\+\s+(\S+)/) {
$setup_docs = 0;
if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
$setup_docs = 1;
}
next;
}

if ($setup_docs && $line =~ /^\+/) {
push(@setup_docs, $line);
}
}

$prefix = '';

foreach my $line (@lines) {
$linenr++;

my $rawline = $line;

$prefix = "$ARGV:$linenr: " if ($emacs);

#extract the filename as it passes
if ($line=~/^\+\+\+\s+(\S+)/) {
$realfile=$1;
$realfile =~ s@^[^/]*/@@;
$in_comment = 0;
next;
}
#extract the line range in the file after the patch is applied
if ($line=~/^\@\@ -\d+,\d+ \+(\d+)(,(\d+))? \@\@/) {
$is_patch = 1;
$first_line = $linenr + 1;
$in_comment = 0;
$realline=$1-1;
if (defined $2) {
$realcnt=$3+1;
} else {
$realcnt=1+1;
}
next;
}

# track the line number as we move through the hunk, note that
# new versions of GNU diff omit the leading space on completely
# blank context lines so we need to count that too.
if ($line =~ /^( |\+|$)/) {
$realline++;
$realcnt-- if ($realcnt != 0);

# track any sort of multi-line comment. Obviously if
# the added text or context do not include the whole
# comment we will not see it. Such is life.
#
# Guestimate if this is a continuing comment. If this
# is the start of a diff block and this line starts
# ' *' then it is very likely a comment.
if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
$in_comment = 1;
}
if ($line =~ m@/\*@) {
$in_comment = 1;
}
if ($line =~ m@\*/@) {
$in_comment = 0;
}

# Measure the line length and indent.
($length, $indent) = line_stats($line);

# Track the previous line.
($prevline, $stashline) = ($stashline, $line);
($previndent, $stashindent) = ($stashindent, $indent);
} elsif ($realcnt == 1) {
$realcnt--;
}

#make up the handle for any error we report on this line
$here = "#$linenr: ";
$here .= "FILE: $realfile:$realline:" if ($realcnt != 0);

my $hereline = "$here\n$line\n";
my $herecurr = "$here\n$line\n";
my $hereprev = "$here\n$prevline\n$line\n";

#check the patch for a signoff:
if ($line =~ /^\s*signed-off-by:/i) {
# This is a signoff, if ugly, so do not double report.
$signoff++;
if (!($line =~ /^\s*Signed-off-by:/)) {
WARN("Signed-off-by: is the preferred form\n" .
$herecurr);
}
if ($line =~ /^\s*signed-off-by:\S/i) {
WARN("need space after Signed-off-by:\n" .
$herecurr);
}
}

# Check for wrappage within a valid hunk of the file
if ($realcnt != 0 && $line !~ m{^(?:\+|-| |$)}) {
ERROR("patch seems to be corrupt (line wrapped?)\n" .
$herecurr);
}

# UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
if (($realfile =~ /^$/ || $line =~ /^\+/) &&
!($line =~ m/^(
[\x09\x0A\x0D\x20-\x7E] # ASCII
| [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
| \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
| \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
| \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
| [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
| \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
)*$/x )) {
ERROR("Invalid UTF-8\n" . $herecurr);
}

#ignore lines being removed
if ($line=~/^-/) {next;}

# check we are in a valid source file if not then ignore this hunk
next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);

#trailing whitespace
if ($line =~ /^\+.*\015/) {
my $herevet = "$here\n" . cat_vet($line) . "\n";
ERROR("DOS line endings\n" . $herevet);

} elsif ($line =~ /^\+.*\S\s+$/ || $line =~ /^\+\s+$/) {
my $herevet = "$here\n" . cat_vet($line) . "\n";
ERROR("trailing whitespace\n" . $herevet);
}
#80 column limit
if ($line =~ /^\+/ && !($prevline=~/\/\*\*/) && $length > 80) {
WARN("line over 80 characters\n" . $herecurr);
}

# check we are in a valid source file *.[hc] if not then ignore this hunk
next if ($realfile !~ /\.[hc]$/);

# at the beginning of a line any tabs must come first and anything
# more than 8 must use tabs.
if ($line=~/^\+\s* \t\s*\S/ or $line=~/^\+\s* \s*/) {
my $herevet = "$here\n" . cat_vet($line) . "\n";
ERROR("use tabs not spaces\n" . $herevet);
}

# Remove comments from the line before processing.
my $comment_edge = ($line =~ s@/\*.*\*/@@g) +
($line =~ s@/\*.*@@) +
($line =~ s@^(.).*\*/@$1@);

# The rest of our checks refer specifically to C style
# only apply those _outside_ comments. Only skip
# lines in the middle of comments.
next if (!$comment_edge && $in_comment);

# Standardise the strings and chars within the input to simplify matching.
$line = sanitise_line($line);

# Check for potential 'bare' types
if ($realcnt &&
$line !~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?$Type\b/ &&
$line !~ /$Ident:\s*$/ &&
$line !~ /^.\s*$Ident\s*$/ &&
# definitions in global scope can only start with types
($line =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?($Ident)\b/ ||
# declarations always start with types
$line =~ /^.\s*(?:$Storage\s+)?($Ident)\b\s*\**\s*$Ident\s*(?:;|=)/) ||
# any (foo ... *) is a pointer cast, and foo is a type
$line =~ /\(($Ident)(?:\s+$Sparse)*\s*\*+\s*$/) {
my $possible = $1;
if ($possible !~ /^(?:$Storage|$Type|DEFINE_\S+)$/ &&
$possible ne 'goto' && $possible ne 'return' &&
$possible ne 'struct' && $possible ne 'enum' &&
$possible ne 'case' && $possible ne 'else' &&
$possible ne 'typedef') {
#print "POSSIBLE<$possible>\n";
push(@bare, $possible);
my $bare = join("|", @bare);
$Bare = qr{
\b(?:$bare)\b
(?:\s*\*+\s*const|\s*\*+|(?:\s*\[\s*\])+)?
(?:\s+$Sparse)*
}x;
}
}

#
# Checks which may be anchored in the context.
#

# Check for switch () and associated case and default
# statements should be at the same indent.
if ($line=~/\bswitch\s*$.*$/) {
my $err = '';
my $sep = '';
my @ctx = ctx_block_outer($linenr, $realcnt);
shift(@ctx);
for my $ctx (@ctx) {
my ($clen, $cindent) = line_stats($ctx);
if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
$indent != $cindent) {
$err .= "$sep$ctx\n";
$sep = '';
} else {
$sep = "[...]\n";
}
}
if ($err ne '') {
ERROR("switch and case should be at the same indent\n$hereline$err");
}
}

# if/while/etc brace do not go on next line, unless defining a do while loop,
# or if that brace on the next line is for something else
if ($line =~ /\b(?:(if|while|for|switch)\s*$|do\b|else\b)/ && $line !~ /^.#/) {
my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
my $ctx_ln = $linenr + $#ctx + 1;
my $ctx_cnt = $realcnt - $#ctx - 1;
my $ctx = join("\n", @ctx);

# Skip over any removed lines in the context following statement.
while ($ctx_cnt > 0 && $lines[$ctx_ln - 1] =~ /^-/) {
$ctx_ln++;
$ctx_cnt--;
}
##warn "line<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>";

if ($ctx !~ /{\s*/ && $ctx_cnt > 0 && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
ERROR("That open brace { should be on the previous line\n" .
"$here\n$ctx\n$lines[$ctx_ln - 1]");
}
if ($level == 0 && $ctx =~ /$\s*\;\s*$/ && defined $lines[$ctx_ln - 1]) {
my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
if ($nindent > $indent) {
WARN("Trailing semicolon indicates no statements, indent implies otherwise\n" .
"$here\n$ctx\n$lines[$ctx_ln - 1]");
}
}
}

#ignore lines not being added
if ($line=~/^[^\+]/) {next;}

# TEST: allow direct testing of the type matcher.
if ($tst_type && $line =~ /^.$Declare$/) {
ERROR("TEST: is type $Declare\n" . $herecurr);
next;
}

# check for initialisation to aggregates open brace on the next line
if ($prevline =~ /$Declare\s*$Ident\s*=\s*$/ &&
$line =~ /^.\s*{/) {
ERROR("That open brace { should be on the previous line\n" . $hereprev);
}

#
# Checks which are anchored on the added line.
#

# check for malformed paths in #include statements (uses RAW line)
if ($rawline =~ m{^.#\s*include\s+[<"](.*)[">]}) {
my $path = $1;
if ($path =~ m{//}) {
ERROR("malformed #include filename\n" .
$herecurr);
}
# Sanitise this special form of string.
$path = 'X' x length($path);
$line =~ s{\<.*\>}{<$path>};
}

# no C99 // comments
if ($line =~ m{//}) {
ERROR("do not use C99 // comments\n" . $herecurr);
}
# Remove C99 comments.
$line =~ s@//.*@@;

#EXPORT_SYMBOL should immediately follow its function closing }.
if (($line =~ /EXPORT_SYMBOL.*$(.*)$/) ||
($line =~ /EXPORT_UNUSED_SYMBOL.*$(.*)$/)) {
my $name = $1;
if (($prevline !~ /^}/) &&
($prevline !~ /^\+}/) &&
($prevline !~ /^ }/) &&
($prevline !~ /\b\Q$name\E(?:\s+$Attribute)?\s*(?:;|=)/)) {
WARN("EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
}
}

# check for external initialisers.
if ($line =~ /^.$Type\s*$Ident\s*=\s*(0|NULL);/) {
ERROR("do not initialise externals to 0 or NULL\n" .
$herecurr);
}
# check for static initialisers.
if ($line =~ /\s*static\s.*=\s*(0|NULL);/) {
ERROR("do not initialise statics to 0 or NULL\n" .
$herecurr);
}

# check for new typedefs, only function parameters and sparse annotations
# make sense.
if ($line =~ /\btypedef\s/ &&
$line !~ /\btypedef\s+$Type\s+$\s*\*?$Ident\s*$\s*$/ &&
$line !~ /\b__bitwise(?:__|)\b/) {
WARN("do not add new typedefs\n" . $herecurr);
}

# * goes on variable not on type
if ($line =~ m{\($NonptrType(\*+)(?:\s+const)?$}) {
ERROR("\"(foo$1)\" should be \"(foo $1)\"\n" .
$herecurr);

} elsif ($line =~ m{$$NonptrType\s+(\*+)(?!\s+const)\s+$}) {
ERROR("\"(foo $1 )\" should be \"(foo $1)\"\n" .
$herecurr);

} elsif ($line =~ m{$NonptrType(\*+)(?:\s+(?:$Attribute|$Sparse))?\s+[A-Za-z\d_]+}) {
ERROR("\"foo$1 bar\" should be \"foo $1bar\"\n" .
$herecurr);

} elsif ($line =~ m{$NonptrType\s+(\*+)(?!\s+(?:$Attribute|$Sparse))\s+[A-Za-z\d_]+}) {
ERROR("\"foo $1 bar\" should be \"foo $1bar\"\n" .
$herecurr);
}

# # no BUG() or BUG_ON()
# if ($line =~ /\b(BUG|BUG_ON)\b/) {
# print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
# print "$herecurr";
# $clean = 0;
# }

# printk should use KERN_* levels. Note that follow on printk's on the
# same line do not need a level, so we use the current block context
# to try and find and validate the current printk. In summary the current
# printk includes all preceeding printk's which have no newline on the end.
# we assume the first bad printk is the one to report.
if ($line =~ /\bprintk$(?!KERN_)\s*"/) {
my $ok = 0;
for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
#print "CHECK<$lines[$ln - 1]\n";
# we have a preceeding printk if it ends
# with "\n" ignore it, else it is to blame
if ($lines[$ln - 1] =~ m{\bprintk\(}) {
if ($rawlines[$ln - 1] !~ m{\\n"}) {
$ok = 1;
}
last;
}
}
if ($ok == 0) {
WARN("printk() should include KERN_ facility level\n" . $herecurr);
}
}

# function brace can't be on same line, except for #defines of do while,
# or if closed on same line
if (($line=~/$Type\s*[A-Za-z\d_]+\(.*$.* {/) and
!($line=~/\#define.*do\s{/) and !($line=~/}/)) {
ERROR("open brace '{' following function declarations go on the next line\n" . $herecurr);
}

# check for spaces between functions and their parentheses.
if ($line =~ /($Ident)\s+\(/ &&
$1 !~ /^(?:if|for|while|switch|return|volatile|__volatile__|__attribute__|format|__extension__|Copyright)$/ &&
$line !~ /$Type\s+\(/ && $line !~ /^.\#\s*define\b/) {
WARN("no space between function name and open parenthesis '('\n" . $herecurr);
}
# Check operator spacing.
# Note we expand the line with the leading + as the real
# line will be displayed with the leading + and the tabs
# will therefore also expand that way.
my $opline = $line;
$opline = expand_tabs($opline);
$opline =~ s/^./ /;
if (!($line=~/\#\s*include/)) {
my $ops = qr{
<<=|>>=|<=|>=|==|!=|
\+=|-=|\*=|\/=|%=|\^=|\|=|&=|
=>|->|<<|>>|<|>|=|!|~|
&&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/
}x;
my @elements = split(/($ops|;)/, $opline);
my $off = 0;
for (my $n = 0; $n < $#elements; $n += 2) {
$off += length($elements[$n]);

my $a = '';
$a = 'V' if ($elements[$n] ne '');
$a = 'W' if ($elements[$n] =~ /\s$/);
$a = 'B' if ($elements[$n] =~ /(\[|$)$/);
$a = 'O' if ($elements[$n] eq '');
$a = 'E' if ($elements[$n] eq '' && $n == 0);

my $op = $elements[$n + 1];

my $c = '';
if (defined $elements[$n + 2]) {
$c = 'V' if ($elements[$n + 2] ne '');
$c = 'W' if ($elements[$n + 2] =~ /^\s/);
$c = 'B' if ($elements[$n + 2] =~ /^($|\]|;)/);
$c = 'O' if ($elements[$n + 2] eq '');
$c = 'E' if ($elements[$n + 2] =~ /\s*\\$/);
} else {
$c = 'E';
}

# Pick up the preceeding and succeeding characters.
my $ca = substr($opline, 0, $off);
my $cc = '';
if (length($opline) >= ($off + length($elements[$n + 1]))) {
$cc = substr($opline, $off + length($elements[$n + 1]));
}
my $cb = "$ca$;$cc";

my $ctx = "${a}x${c}";

my $at = "(ctx:$ctx)";

my $ptr = (" " x $off) . "^";
my $hereptr = "$hereline$ptr\n";

# Classify operators into binary, unary, or
# definitions (* only) where they have more
# than one mode.
my $unary_ctx = $prevline . $ca;
$unary_ctx =~ s/^./ /;
my $is_unary = 0;
my $Unary = qr{
(?:
^|;|,|$ops|$|\?|:|
\(\s*$Type\s*$|
$Type|
return|case|else|
sizeof|
\{|\}|
\[|
\#\s*define\s+$Ident\s*(?:$[^$]*\))?|
\#\s*else|
\#\s*endif|
\#\s*(?:if|ifndef|ifdef)\b.*
)\s*\\?\s*$
}x;
my $UnaryFalse = qr{
sizeof\s*$\s*$Type\s*$\s*$
}x;
my $UnaryDefine = qr{
(?:$Type|$Bare)\s*|
(?:$Type|$Bare).*,\s*\**
}x;
if ($op eq '-' || $op eq '&' || $op eq '*') {
# An operator is binary if the left hand
# side is a value. Pick out the known
# non-values.
if ($unary_ctx =~ /$Unary$/s &&
$unary_ctx !~ /$UnaryFalse$/s) {
$is_unary = 1;

# Special handling for ')' check if this
# brace represents a conditional, if so
# we are unary.
} elsif ($unary_ctx =~ /\)\s*$/) {
my $before = ctx_expr_before($unary_ctx);
if ($before =~ /(?:for|if|while)\s*$/) {
$is_unary = 1;
}
}

# Check for type definition for of '*'.
if ($op eq '*' && $unary_ctx =~ /$UnaryDefine$/) {
$is_unary = 2;
}
}

#if ($op eq '-' || $op eq '&' || $op eq '*') {
# print "UNARY: <$is_unary $a:$op:$c> <$ca:$op:$cc> <$unary_ctx>\n";
#}

# ; should have either the end of line or a space or \ after it
if ($op eq ';') {
if ($ctx !~ /.x[WEB]/ && $cc !~ /^\\/ &&
$cc !~ /^;/) {
ERROR("need space after that '$op' $at\n" . $hereptr);
}

# // is a comment
} elsif ($op eq '//') {

# -> should have no spaces
} elsif ($op eq '->') {
if ($ctx =~ /Wx.|.xW/) {
ERROR("no spaces around that '$op' $at\n" . $hereptr);
}

# , must have a space on the right.
} elsif ($op eq ',') {
if ($ctx !~ /.xW|.xE/ && $cc !~ /^}/) {
ERROR("need space after that '$op' $at\n" . $hereptr);
}

# '*' as part of a type definition -- reported already.
} elsif ($op eq '*' && $is_unary == 2) {
#warn "'*' is part of type\n";

# unary operators should have a space before and
# none after. May be left adjacent to another
# unary operator, or a cast
} elsif ($op eq '!' || $op eq '~' ||
($is_unary && ($op eq '*' || $op eq '-' || $op eq '&'))) {
if ($ctx !~ /[WEB]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
ERROR("need space before that '$op' $at\n" . $hereptr);
}
if ($ctx =~ /.xW/) {
ERROR("no space after that '$op' $at\n" . $hereptr);
}

# unary ++ and unary -- are allowed no space on one side.
} elsif ($op eq '++' or $op eq '--') {
if ($ctx !~ /[WOB]x[^W]/ && $ctx !~ /[^W]x[WOBE]/) {
ERROR("need space one side of that '$op' $at\n" . $hereptr);
}
if ($ctx =~ /Wx./ && $cc =~ /^;/) {
ERROR("no space before that '$op' $at\n" . $hereptr);
}

# << and >> may either have or not have spaces both sides
} elsif ($op eq '<<' or $op eq '>>' or
$op eq '&' or $op eq '^' or $op eq '|' or
$op eq '+' or $op eq '-' or
$op eq '*' or $op eq '/')
{
if ($ctx !~ /VxV|WxW|VxE|WxE|VxO/) {
ERROR("need consistent spacing around '$op' $at\n" .
$hereptr);
}

# All the others need spaces both sides.
} elsif ($ctx !~ /[EW]x[WE]/) {
# Ignore email addresses <foo@bar>
if (!($op eq '<' && $cb =~ /$;\S+\@\S+>/) &&
!($op eq '>' && $cb =~ /<\S+\@\S+$;/)) {
ERROR("need spaces around that '$op' $at\n" . $hereptr);
}
}
$off += length($elements[$n + 1]);
}
}

# check for multiple assignments
if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
WARN("multiple assignments should be avoided\n" . $herecurr);
}

## # check for multiple declarations, allowing for a function declaration
## # continuation.
## if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
## $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
##
## # Remove any bracketed sections to ensure we do not
## # falsly report the parameters of functions.
## my $ln = $line;
## while ($ln =~ s/$[^\($]*\)//g) {
## }
## if ($ln =~ /,/) {
## WARN("declaring multiple variables together should be avoided\n" . $herecurr);
## }
## }

#need space before brace following if, while, etc
if (($line =~ /$.*${/ && $line !~ /$$Type${/) ||
$line =~ /do{/) {
ERROR("need a space before the open brace '{'\n" . $herecurr);
}

# closing brace should have a space following it when it has anything
# on the line
if ($line =~ /}(?!(?:,|;|\)))\S/) {
ERROR("need a space after that close brace '}'\n" . $herecurr);
}

# check spacing on square brackets
if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
ERROR("no space after that open square bracket '['\n" . $herecurr);
}
if ($line =~ /\s\]/) {
ERROR("no space before that close square bracket ']'\n" . $herecurr);
}

# check spacing on paretheses
if ($line =~ /$\s/ && $line !~ /\(\s*(?:\$?$/ &&
$line !~ /for\s*$\s+;/) {
ERROR("no space after that open parenthesis '('\n" . $herecurr);
}
if ($line =~ /\s$/ && $line !~ /^.\s*\)/ &&
$line !~ /for\s*$.*;\s+$/) {
ERROR("no space before that close parenthesis ')'\n" . $herecurr);
}

#goto labels aren't indented, allow a single space however
if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
!($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
WARN("labels should not be indented\n" . $herecurr);
}

# Need a space before open parenthesis after if, while etc
if ($line=~/\b(if|while|for|switch)$/) {
ERROR("need a space before the open parenthesis '('\n" . $herecurr);
}

# Check for illegal assignment in if conditional.
if ($line=~/\bif\s*\(.*[^<>!=]=[^=].*$/) {
#next if ($line=~/\".*\Q$op\E.*\"/ or $line=~/\'\Q$op\E\'/);
ERROR("do not use assignment in if condition\n" . $herecurr);
}

# Check for }<nl>else {, these must be at the same
# indent level to be relevant to each other.
if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
$previndent == $indent) {
ERROR("else should follow close brace '}'\n" . $hereprev);
}

#studly caps, commented out until figure out how to distinguish between use of existing and adding new
# if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
# print "No studly caps, use _\n";
# print "$herecurr";
# $clean = 0;
# }

#no spaces allowed after \ in define
if ($line=~/\#define.*\\\s$/) {
WARN("Whitepspace after \\ makes next lines useless\n" . $herecurr);
}

#warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
if ($tree && $rawline =~ m{^.\#\s*include\s*\<asm\/(.*)\.h\>}) {
my $checkfile = "include/linux/$1.h";
if (-f $checkfile) {
CHK("Use #include <linux/$1.h> instead of <asm/$1.h>\n" .
$herecurr);
}
}

# if and else should not have general statements after it
if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/ &&
$1 !~ /^\s*(?:\sif|{|\\|$)/) {
ERROR("trailing statements should be on next line\n" . $herecurr);
}

# multi-statement macros should be enclosed in a do while loop, grab the
# first statement and ensure its the whole macro if its not enclosed
# in a known goot container
if ($prevline =~ /\#define.*\\/ &&
$prevline !~/(?:do\s+{|$\{|\{)/ &&
$line !~ /(?:do\s+{|\(\{|\{)/ &&
$line !~ /^.\s*$Declare\s/) {
# Grab the first statement, if that is the entire macro
# its ok. This may start either on the #define line
# or the one below.
my $ln = $linenr;
my $cnt = $realcnt;
my $off = 0;

# If the macro starts on the define line start
# grabbing the statement after the identifier
$prevline =~ m{^(.#\s*define\s*$Ident(?:\([^$]*\))?\s*)(.*)\\\s*$};
##print "1<$1> 2<$2>\n";
if (defined $2 && $2 ne '') {
$off = length($1);
$ln--;
$cnt++;
}
my @ctx = ctx_statement($ln, $cnt, $off);
my $ctx_ln = $ln + $#ctx + 1;
my $ctx = join("\n", @ctx);

# Pull in any empty extension lines.
while ($ctx =~ /\\$/ &&
$lines[$ctx_ln - 1] =~ /^.\s*(?:\\)?$/) {
$ctx .= $lines[$ctx_ln - 1];
$ctx_ln++;
}

if ($ctx =~ /\\$/) {
if ($ctx =~ /;/) {
ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
} else {
ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
}
}
}

# check for redundant bracing round if etc
if ($line =~ /\b(if|while|for|else)\b/) {
# Locate the end of the opening statement.
my @control = ctx_statement($linenr, $realcnt, 0);
my $nr = $linenr + (scalar(@control) - 1);
my $cnt = $realcnt - (scalar(@control) - 1);

my $off = $realcnt - $cnt;
#print "$off: line<$line>end<" . $lines[$nr - 1] . ">\n";

# If this is is a braced statement group check it
if ($lines[$nr - 1] =~ /{\s*$/) {
my ($lvl, @block) = ctx_block_level($nr, $cnt);

my $stmt = join(' ', @block);
$stmt =~ s/(^[^{]*){//;
my $before = $1;
$stmt =~ s/}([^}]*$)//;
my $after = $1;

#print "block<" . join(' ', @block) . "><" . scalar(@block) . ">\n";
#print "stmt<$stmt>\n\n";

# Count the ;'s if there is fewer than two
# then there can only be one statement,
# if there is a brace inside we cannot
# trivially detect if its one statement.
# Also nested if's often require braces to
# disambiguate the else binding so shhh there.
my @semi = ($stmt =~ /;/g);
push(@semi, "/**/") if ($stmt =~ m@/\*@);
##print "semi<" . scalar(@semi) . ">\n";
if ($lvl == 0 && scalar(@semi) < 2 &&
$stmt !~ /{/ && $stmt !~ /\bif\b/ &&
$before !~ /}/ && $after !~ /{/) {
my $herectx = "$here\n" . join("\n", @control, @block[1 .. $#block]) . "\n";
shift(@block);
WARN("braces {} are not necessary for single statement blocks\n" . $herectx);
}
}
}

# don't include deprecated include files (uses RAW line)
for my $inc (@dep_includes) {
if ($rawline =~ m@\#\s*include\s*\<$inc>@) {
ERROR("Don't use <$inc>: see Documentation/feature-removal-schedule.txt\n" . $herecurr);
}
}

# don't use deprecated functions
for my $func (@dep_functions) {
if ($line =~ /\b$func\b/) {
ERROR("Don't use $func(): see Documentation/feature-removal-schedule.txt\n" . $herecurr);
}
}

# no volatiles please
if ($line =~ /\bvolatile\b/ && $line !~ /\basm\s+volatile\b/) {
WARN("Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
}

# SPIN_LOCK_UNLOCKED & RW_LOCK_UNLOCKED are deprecated
if ($line =~ /\b(SPIN_LOCK_UNLOCKED|RW_LOCK_UNLOCKED)/) {
ERROR("Use of $1 is deprecated: see Documentation/spinlocks.txt\n" . $herecurr);
}

# warn about #if 0
if ($line =~ /^.#\s*if\s+0\b/) {
CHK("if this code is redundant consider removing it\n" .
$herecurr);
}

# check for needless kfree() checks
if ($prevline =~ /\bif\s*$([^$]*)\)/) {
my $expr = $1;
if ($line =~ /\bkfree$\Q$expr\E$;/) {
WARN("kfree(NULL) is safe this check is probabally not required\n" . $hereprev);
}
}

# warn about #ifdefs in C files
# if ($line =~ /^.#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
# print "#ifdef in C files should be avoided\n";
# print "$herecurr";
# $clean = 0;
# }

# warn about spacing in #ifdefs
if ($line =~ /^.#\s*(ifdef|ifndef|elif)\s\s+/) {
ERROR("exactly one space required after that #$1\n" . $herecurr);
}

# check for spinlock_t definitions without a comment.
if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/) {
my $which = $1;
if (!ctx_has_comment($first_line, $linenr)) {
CHK("$1 definition without comment\n" . $herecurr);
}
}
# check for memory barriers without a comment.
if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
if (!ctx_has_comment($first_line, $linenr)) {
CHK("memory barrier without comment\n" . $herecurr);
}
}
# check of hardware specific defines
if ($line =~ m@^.#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
CHK("architecture specific defines should be avoided\n" . $herecurr);
}

# check the location of the inline attribute, that it is between
# storage class and type.
if ($line =~ /\b$Type\s+$Inline\b/ ||
$line =~ /\b$Inline\s+$Storage\b/) {
ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
}

# check for new externs in .c files.
if ($line =~ /^.\s*extern\s/ && ($realfile =~ /\.c$/)) {
WARN("externs should be avoided in .c files\n" . $herecurr);
}

# checks for new __setup's
if ($rawline =~ /\b__setup$"([^"]*)"/) {
my $name = $1;

if (!grep(/$name/, @setup_docs)) {
CHK("__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
}
}

# check for pointless casting of kmalloc return
if ($line =~ /\*\s*$\s*k[czm]alloc\b/) {
WARN("unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n"; . $herecurr);
}
}

if ($chk_patch && !$is_patch) {
ERROR("Does not appear to be a unified-diff format patch\n");
}
if ($is_patch && $chk_signoff && $signoff == 0) {
ERROR("Missing Signed-off-by: line(s)\n");
}

if ($clean == 0 && ($chk_patch || $is_patch)) {
print report_dump();
}
if ($clean == 1 && $quiet == 0) {
print "Your patch has no obvious style problems and is ready for submission.\n"
}
if ($clean == 0 && $quiet == 0) {
print "Your patch has style problems, please review. If any of these errors\n";
print "are false positives report them to the maintainer, see\n";
print "CHECKPATCH in MAINTAINERS.\n";
}
return $clean;
}
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