checkpatch.pl 89.7 KB
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#!/usr/bin/perl -w
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# (c) 2001, Dave Jones. (the file handling bit)
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# (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
Andy Whitcroft's avatar
Andy Whitcroft committed
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# (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
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# (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
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# Licensed under the terms of the GNU GPL License version 2

use strict;

my $P = $0;
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$P =~ s@.*/@@g;
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my $V = '0.32';
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use Getopt::Long qw(:config no_auto_abbrev);

my $quiet = 0;
my $tree = 1;
my $chk_signoff = 1;
my $chk_patch = 1;
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my $tst_only;
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my $emacs = 0;
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my $terse = 0;
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my $file = 0;
my $check = 0;
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my $summary = 1;
my $mailback = 0;
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my $summary_file = 0;
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my $show_types = 0;
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my $root;
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my %debug;
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my %ignore_type = ();
my @ignore = ();
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my $help = 0;
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my $configuration_file = ".checkpatch.conf";
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sub help {
	my ($exitcode) = @_;

	print << "EOM";
Usage: $P [OPTION]... [FILE]...
Version: $V

Options:
  -q, --quiet                quiet
  --no-tree                  run without a kernel tree
  --no-signoff               do not check for 'Signed-off-by' line
  --patch                    treat FILE as patchfile (default)
  --emacs                    emacs compile window format
  --terse                    one line per report
  -f, --file                 treat FILE as regular source file
  --subjective, --strict     enable more subjective tests
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  --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  --show-types               show the message "types" in the output
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  --root=PATH                PATH to the kernel tree root
  --no-summary               suppress the per-file summary
  --mailback                 only produce a report in case of warnings/errors
  --summary-file             include the filename in summary
  --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
                             'values', 'possible', 'type', and 'attr' (default
                             is all off)
  --test-only=WORD           report only warnings/errors containing WORD
                             literally
  -h, --help, --version      display this help and exit

When FILE is - read standard input.
EOM

	exit($exitcode);
}

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my $conf = which_conf($configuration_file);
if (-f $conf) {
	my @conf_args;
	open(my $conffile, '<', "$conf")
	    or warn "$P: Can't find a readable $configuration_file file $!\n";

	while (<$conffile>) {
		my $line = $_;

		$line =~ s/\s*\n?$//g;
		$line =~ s/^\s*//g;
		$line =~ s/\s+/ /g;

		next if ($line =~ m/^\s*#/);
		next if ($line =~ m/^\s*$/);

		my @words = split(" ", $line);
		foreach my $word (@words) {
			last if ($word =~ m/^#/);
			push (@conf_args, $word);
		}
	}
	close($conffile);
	unshift(@ARGV, @conf_args) if @conf_args;
}

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GetOptions(
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	'q|quiet+'	=> \$quiet,
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	'tree!'		=> \$tree,
	'signoff!'	=> \$chk_signoff,
	'patch!'	=> \$chk_patch,
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	'emacs!'	=> \$emacs,
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	'terse!'	=> \$terse,
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	'f|file!'	=> \$file,
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	'subjective!'	=> \$check,
	'strict!'	=> \$check,
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	'ignore=s'	=> \@ignore,
	'show-types!'	=> \$show_types,
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	'root=s'	=> \$root,
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	'summary!'	=> \$summary,
	'mailback!'	=> \$mailback,
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	'summary-file!'	=> \$summary_file,

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	'debug=s'	=> \%debug,
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	'test-only=s'	=> \$tst_only,
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	'h|help'	=> \$help,
	'version'	=> \$help
) or help(1);

help(0) if ($help);
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my $exit = 0;

if ($#ARGV < 0) {
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	print "$P: no input files\n";
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	exit(1);
}

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@ignore = split(/,/, join(',',@ignore));
foreach my $word (@ignore) {
	$word =~ s/\s*\n?$//g;
	$word =~ s/^\s*//g;
	$word =~ s/\s+/ /g;
	$word =~ tr/[a-z]/[A-Z]/;

	next if ($word =~ m/^\s*#/);
	next if ($word =~ m/^\s*$/);

	$ignore_type{$word}++;
}

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my $dbg_values = 0;
my $dbg_possible = 0;
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my $dbg_type = 0;
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my $dbg_attr = 0;
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for my $key (keys %debug) {
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	## no critic
	eval "\${dbg_$key} = '$debug{$key}';";
	die "$@" if ($@);
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}

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my $rpt_cleaners = 0;

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if ($terse) {
	$emacs = 1;
	$quiet++;
}

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if ($tree) {
	if (defined $root) {
		if (!top_of_kernel_tree($root)) {
			die "$P: $root: --root does not point at a valid tree\n";
		}
	} else {
		if (top_of_kernel_tree('.')) {
			$root = '.';
		} elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
						top_of_kernel_tree($1)) {
			$root = $1;
		}
	}

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

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my $emitted_corrupt = 0;

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our $Ident	= qr{
			[A-Za-z_][A-Za-z\d_]*
			(?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
		}x;
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our $Storage	= qr{extern|static|asmlinkage};
our $Sparse	= qr{
			__user|
			__kernel|
			__force|
			__iomem|
			__must_check|
			__init_refok|
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			__kprobes|
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			__ref|
			__rcu
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		}x;
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# Notes to $Attribute:
# We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
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our $Attribute	= qr{
			const|
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			__percpu|
			__nocast|
			__safe|
			__bitwise__|
			__packed__|
			__packed2__|
			__naked|
			__maybe_unused|
			__always_unused|
			__noreturn|
			__used|
			__cold|
			__noclone|
			__deprecated|
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			__read_mostly|
			__kprobes|
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			__(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
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			____cacheline_aligned|
			____cacheline_aligned_in_smp|
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			____cacheline_internodealigned_in_smp|
			__weak
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		  }x;
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our $Modifier;
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our $Inline	= qr{inline|__always_inline|noinline};
our $Member	= qr{->$Ident|\.$Ident|\[[^]]*\]};
our $Lval	= qr{$Ident(?:$Member)*};

our $Constant	= qr{(?:[0-9]+|0x[0-9a-fA-F]+)[UL]*};
our $Assignment	= qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
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our $Compare    = qr{<=|>=|==|!=|<|>};
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our $Operators	= qr{
			<=|>=|==|!=|
			=>|->|<<|>>|<|>|!|~|
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			&&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
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		  }x;

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our $NonptrType;
our $Type;
our $Declare;

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our $NON_ASCII_UTF8	= qr{
	[\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
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	|  \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;

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our $UTF8	= qr{
	[\x09\x0A\x0D\x20-\x7E]              # ASCII
	| $NON_ASCII_UTF8
}x;

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our $typeTypedefs = qr{(?x:
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	(?:__)?(?:u|s|be|le)(?:8|16|32|64)|
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	atomic_t
)};

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our $logFunctions = qr{(?x:
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	printk(?:_ratelimited|_once|)|
	[a-z0-9]+_(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
	WARN(?:_RATELIMIT|_ONCE|)|
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	panic|
	MODULE_[A-Z_]+
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)};

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our $signature_tags = qr{(?xi:
	Signed-off-by:|
	Acked-by:|
	Tested-by:|
	Reviewed-by:|
	Reported-by:|
	To:|
	Cc:
)};

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our @typeList = (
	qr{void},
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	qr{(?:unsigned\s+)?char},
	qr{(?:unsigned\s+)?short},
	qr{(?:unsigned\s+)?int},
	qr{(?:unsigned\s+)?long},
	qr{(?:unsigned\s+)?long\s+int},
	qr{(?:unsigned\s+)?long\s+long},
	qr{(?:unsigned\s+)?long\s+long\s+int},
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	qr{unsigned},
	qr{float},
	qr{double},
	qr{bool},
	qr{struct\s+$Ident},
	qr{union\s+$Ident},
	qr{enum\s+$Ident},
	qr{${Ident}_t},
	qr{${Ident}_handler},
	qr{${Ident}_handler_fn},
);
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our @modifierList = (
	qr{fastcall},
);
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our $allowed_asm_includes = qr{(?x:
	irq|
	memory
)};
# memory.h: ARM has a custom one

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sub build_types {
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	my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
	my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
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	$Modifier	= qr{(?:$Attribute|$Sparse|$mods)};
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	$NonptrType	= qr{
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			(?:$Modifier\s+|const\s+)*
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			(?:
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				(?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
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				(?:$typeTypedefs\b)|
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				(?:${all}\b)
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			)
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			(?:\s+$Modifier|\s+const)*
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		  }x;
	$Type	= qr{
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			$NonptrType
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			(?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
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			(?:\s+$Inline|\s+$Modifier)*
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		  }x;
	$Declare	= qr{(?:$Storage\s+)?$Type};
}
build_types();
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our $match_balanced_parentheses = qr/(\((?:[^\(\)]+|(-1))*\))/;

our $Typecast	= qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
our $LvalOrFunc	= qr{($Lval)\s*($match_balanced_parentheses{0,1})\s*};

sub deparenthesize {
	my ($string) = @_;
	return "" if (!defined($string));
	$string =~ s@^\s*\(\s*@@g;
	$string =~ s@\s*\)\s*$@@g;
	$string =~ s@\s+@ @g;
	return $string;
}

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$chk_signoff = 0 if ($file);

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

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

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my @rawlines = ();
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my @lines = ();
my $vname;
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for my $filename (@ARGV) {
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	my $FILE;
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	if ($file) {
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		open($FILE, '-|', "diff -u /dev/null $filename") ||
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			die "$P: $filename: diff failed - $!\n";
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	} elsif ($filename eq '-') {
		open($FILE, '<&STDIN');
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	} else {
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		open($FILE, '<', "$filename") ||
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			die "$P: $filename: open failed - $!\n";
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	}
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	if ($filename eq '-') {
		$vname = 'Your patch';
	} else {
		$vname = $filename;
	}
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	while (<$FILE>) {
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		chomp;
		push(@rawlines, $_);
	}
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	close($FILE);
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	if (!process($filename)) {
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		$exit = 1;
	}
	@rawlines = ();
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	@lines = ();
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}

exit($exit);

sub top_of_kernel_tree {
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	my ($root) = @_;

	my @tree_check = (
		"COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
		"README", "Documentation", "arch", "include", "drivers",
		"fs", "init", "ipc", "kernel", "lib", "scripts",
	);

	foreach my $check (@tree_check) {
		if (! -e $root . '/' . $check) {
			return 0;
		}
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	}
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	return 1;
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    }
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sub parse_email {
	my ($formatted_email) = @_;

	my $name = "";
	my $address = "";
	my $comment = "";

	if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
		$name = $1;
		$address = $2;
		$comment = $3 if defined $3;
	} elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
		$address = $1;
		$comment = $2 if defined $2;
	} elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
		$address = $1;
		$comment = $2 if defined $2;
		$formatted_email =~ s/$address.*$//;
		$name = $formatted_email;
		$name =~ s/^\s+|\s+$//g;
		$name =~ s/^\"|\"$//g;
		# If there's a name left after stripping spaces and
		# leading quotes, and the address doesn't have both
		# leading and trailing angle brackets, the address
		# is invalid. ie:
		#   "joe smith joe@smith.com" bad
		#   "joe smith <joe@smith.com" bad
		if ($name ne "" && $address !~ /^<[^>]+>$/) {
			$name = "";
			$address = "";
			$comment = "";
		}
	}

	$name =~ s/^\s+|\s+$//g;
	$name =~ s/^\"|\"$//g;
	$address =~ s/^\s+|\s+$//g;
	$address =~ s/^\<|\>$//g;

	if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
		$name =~ s/(?<!\\)"/\\"/g; ##escape quotes
		$name = "\"$name\"";
	}

	return ($name, $address, $comment);
}

sub format_email {
	my ($name, $address) = @_;

	my $formatted_email;

	$name =~ s/^\s+|\s+$//g;
	$name =~ s/^\"|\"$//g;
	$address =~ s/^\s+|\s+$//g;

	if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
		$name =~ s/(?<!\\)"/\\"/g; ##escape quotes
		$name = "\"$name\"";
	}

	if ("$name" eq "") {
		$formatted_email = "$address";
	} else {
		$formatted_email = "$name <$address>";
	}

	return $formatted_email;
}

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sub which_conf {
	my ($conf) = @_;

	foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
		if (-e "$path/$conf") {
			return "$path/$conf";
		}
	}

	return "";
}

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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;
}
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sub copy_spacing {
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	(my $res = shift) =~ tr/\t/ /c;
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	return $res;
}
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sub line_stats {
	my ($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));
}

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my $sanitise_quote = '';

sub sanitise_line_reset {
	my ($in_comment) = @_;

	if ($in_comment) {
		$sanitise_quote = '*/';
	} else {
		$sanitise_quote = '';
	}
}
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sub sanitise_line {
	my ($line) = @_;

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

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	my $qlen = 0;
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	my $off = 0;
	my $c;
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	# Always copy over the diff marker.
	$res = substr($line, 0, 1);

	for ($off = 1; $off < length($line); $off++) {
		$c = substr($line, $off, 1);

		# Comments we are wacking completly including the begin
		# and end, all to $;.
		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
			$sanitise_quote = '*/';

			substr($res, $off, 2, "$;$;");
			$off++;
			next;
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		}
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		if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
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			$sanitise_quote = '';
			substr($res, $off, 2, "$;$;");
			$off++;
			next;
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		}
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		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
			$sanitise_quote = '//';

			substr($res, $off, 2, $sanitise_quote);
			$off++;
			next;
		}
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		# A \ in a string means ignore the next character.
		if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
		    $c eq "\\") {
			substr($res, $off, 2, 'XX');
			$off++;
			next;
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		}
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		# Regular quotes.
		if ($c eq "'" || $c eq '"') {
			if ($sanitise_quote eq '') {
				$sanitise_quote = $c;
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				substr($res, $off, 1, $c);
				next;
			} elsif ($sanitise_quote eq $c) {
				$sanitise_quote = '';
			}
		}
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		#print "c<$c> SQ<$sanitise_quote>\n";
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611
		if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
			substr($res, $off, 1, $;);
612
613
		} elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
			substr($res, $off, 1, $;);
614
615
616
617
618
		} elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
			substr($res, $off, 1, 'X');
		} else {
			substr($res, $off, 1, $c);
		}
619
620
	}

621
622
623
624
	if ($sanitise_quote eq '//') {
		$sanitise_quote = '';
	}

625
	# The pathname on a #include may be surrounded by '<' and '>'.
626
	if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
627
628
629
630
		my $clean = 'X' x length($1);
		$res =~ s@\<.*\>@<$clean>@;

	# The whole of a #error is a string.
631
	} elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
632
		my $clean = 'X' x length($1);
633
		$res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
634
635
	}

636
637
638
	return $res;
}

639
640
641
642
643
644
sub ctx_statement_block {
	my ($linenr, $remain, $off) = @_;
	my $line = $linenr - 1;
	my $blk = '';
	my $soff = $off;
	my $coff = $off - 1;
645
	my $coff_set = 0;
646

647
648
	my $loff = 0;

649
650
	my $type = '';
	my $level = 0;
651
	my @stack = ();
652
	my $p;
653
654
	my $c;
	my $len = 0;
655
656

	my $remainder;
657
	while (1) {
658
659
		@stack = (['', 0]) if ($#stack == -1);

660
		#warn "CSB: blk<$blk> remain<$remain>\n";
661
662
663
664
		# If we are about to drop off the end, pull in more
		# context.
		if ($off >= $len) {
			for (; $remain > 0; $line++) {
665
				last if (!defined $lines[$line]);
666
				next if ($lines[$line] =~ /^-/);
667
				$remain--;
668
				$loff = $len;
669
				$blk .= $lines[$line] . "\n";
670
671
672
673
674
675
				$len = length($blk);
				$line++;
				last;
			}
			# Bail if there is no further context.
			#warn "CSB: blk<$blk> off<$off> len<$len>\n";
676
			if ($off >= $len) {
677
678
679
				last;
			}
		}
680
		$p = $c;
681
		$c = substr($blk, $off, 1);
682
		$remainder = substr($blk, $off);
683

684
		#warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
685
686
687
688
689
690
691
692
693
694

		# Handle nested #if/#else.
		if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
			push(@stack, [ $type, $level ]);
		} elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
			($type, $level) = @{$stack[$#stack - 1]};
		} elsif ($remainder =~ /^#\s*endif\b/) {
			($type, $level) = @{pop(@stack)};
		}

695
696
697
698
699
700
		# Statement ends at the ';' or a close '}' at the
		# outermost level.
		if ($level == 0 && $c eq ';') {
			last;
		}

701
		# An else is really a conditional as long as its not else if
702
703
704
705
706
707
708
709
		if ($level == 0 && $coff_set == 0 &&
				(!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
				$remainder =~ /^(else)(?:\s|{)/ &&
				$remainder !~ /^else\s+if\b/) {
			$coff = $off + length($1) - 1;
			$coff_set = 1;
			#warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
			#warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
710
711
		}

712
713
714
715
716
717
718
719
720
721
		if (($type eq '' || $type eq '(') && $c eq '(') {
			$level++;
			$type = '(';
		}
		if ($type eq '(' && $c eq ')') {
			$level--;
			$type = ($level != 0)? '(' : '';

			if ($level == 0 && $coff < $soff) {
				$coff = $off;
722
723
				$coff_set = 1;
				#warn "CSB: mark coff<$coff>\n";
724
725
726
727
728
729
730
731
732
733
734
			}
		}
		if (($type eq '' || $type eq '{') && $c eq '{') {
			$level++;
			$type = '{';
		}
		if ($type eq '{' && $c eq '}') {
			$level--;
			$type = ($level != 0)? '{' : '';

			if ($level == 0) {
735
736
737
				if (substr($blk, $off + 1, 1) eq ';') {
					$off++;
				}
738
739
740
741
742
				last;
			}
		}
		$off++;
	}
743
	# We are truly at the end, so shuffle to the next line.
744
	if ($off == $len) {
745
		$loff = $len + 1;
746
747
748
		$line++;
		$remain--;
	}
749
750
751
752
753
754
755

	my $statement = substr($blk, $soff, $off - $soff + 1);
	my $condition = substr($blk, $soff, $coff - $soff + 1);

	#warn "STATEMENT<$statement>\n";
	#warn "CONDITION<$condition>\n";

756
	#print "coff<$coff> soff<$off> loff<$loff>\n";
757
758
759
760
761

	return ($statement, $condition,
			$line, $remain + 1, $off - $loff + 1, $level);
}

762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
sub statement_lines {
	my ($stmt) = @_;

	# Strip the diff line prefixes and rip blank lines at start and end.
	$stmt =~ s/(^|\n)./$1/g;
	$stmt =~ s/^\s*//;
	$stmt =~ s/\s*$//;

	my @stmt_lines = ($stmt =~ /\n/g);

	return $#stmt_lines + 2;
}

sub statement_rawlines {
	my ($stmt) = @_;

	my @stmt_lines = ($stmt =~ /\n/g);

	return $#stmt_lines + 2;
}

sub statement_block_size {
	my ($stmt) = @_;

	$stmt =~ s/(^|\n)./$1/g;
	$stmt =~ s/^\s*{//;
	$stmt =~ s/}\s*$//;
	$stmt =~ s/^\s*//;
	$stmt =~ s/\s*$//;

	my @stmt_lines = ($stmt =~ /\n/g);
	my @stmt_statements = ($stmt =~ /;/g);

	my $stmt_lines = $#stmt_lines + 2;
	my $stmt_statements = $#stmt_statements + 1;

	if ($stmt_lines > $stmt_statements) {
		return $stmt_lines;
	} else {
		return $stmt_statements;
	}
}

805
806
807
808
809
810
sub ctx_statement_full {
	my ($linenr, $remain, $off) = @_;
	my ($statement, $condition, $level);

	my (@chunks);

811
	# Grab the first conditional/block pair.
812
813
	($statement, $condition, $linenr, $remain, $off, $level) =
				ctx_statement_block($linenr, $remain, $off);
814
	#print "F: c<$condition> s<$statement> remain<$remain>\n";
815
816
817
818
819
820
821
	push(@chunks, [ $condition, $statement ]);
	if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
		return ($level, $linenr, @chunks);
	}

	# Pull in the following conditional/block pairs and see if they
	# could continue the statement.
822
823
824
	for (;;) {
		($statement, $condition, $linenr, $remain, $off, $level) =
				ctx_statement_block($linenr, $remain, $off);
825
		#print "C: c<$condition> s<$statement> remain<$remain>\n";
826
		last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
827
828
		#print "C: push\n";
		push(@chunks, [ $condition, $statement ]);
829
830
831
	}

	return ($level, $linenr, @chunks);
832
833
}

834
sub ctx_block_get {
835
	my ($linenr, $remain, $outer, $open, $close, $off) = @_;
836
837
838
839
840
841
842
	my $line;
	my $start = $linenr - 1;
	my $blk = '';
	my @o;
	my @c;
	my @res = ();

843
	my $level = 0;
844
	my @stack = ($level);
845
846
847
848
849
	for ($line = $start; $remain > 0; $line++) {
		next if ($rawlines[$line] =~ /^-/);
		$remain--;

		$blk .= $rawlines[$line];
850
851

		# Handle nested #if/#else.
852
		if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
853
			push(@stack, $level);
854
		} elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
855
			$level = $stack[$#stack - 1];
856
		} elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
857
858
859
			$level = pop(@stack);
		}

860
		foreach my $c (split(//, $lines[$line])) {
861
862
863
864
865
			##print "C<$c>L<$level><$open$close>O<$off>\n";
			if ($off > 0) {
				$off--;
				next;
			}
866

867
868
869
870
871
872
873
			if ($c eq $close && $level > 0) {
				$level--;
				last if ($level == 0);
			} elsif ($c eq $open) {
				$level++;
			}
		}
874

875
		if (!$outer || $level <= 1) {
876
			push(@res, $rawlines[$line]);
877
878
		}

879
		last if ($level == 0);
880
881
	}

882
	return ($level, @res);
883
884
885
886
}
sub ctx_block_outer {
	my ($linenr, $remain) = @_;

887
888
	my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
	return @r;
889
890
891
892
}
sub ctx_block {
	my ($linenr, $remain) = @_;

893
894
	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
	return @r;
895
896
}
sub ctx_statement {
897
898
899
900
901
902
	my ($linenr, $remain, $off) = @_;

	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
	return @r;
}
sub ctx_block_level {
903
904
	my ($linenr, $remain) = @_;

905
	return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
906
}
907
908
909
910
911
sub ctx_statement_level {
	my ($linenr, $remain, $off) = @_;

	return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
}
912
913
914
915
916

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

	# Catch a comment on the end of the line itself.
917
	my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
918
919
920
921
922
923
924
	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++) {
925
926
		my $line = $rawlines[$linenr - 1];
		#warn "           $line\n";
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
		if ($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);

949
	##print "LINE: $rawlines[$end_line - 1 ]\n";
950
951
952
953
954
	##print "CMMT: $cmt\n";

	return ($cmt ne '');
}

955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
sub raw_line {
	my ($linenr, $cnt) = @_;

	my $offset = $linenr - 1;
	$cnt++;

	my $line;
	while ($cnt) {
		$line = $rawlines[$offset++];
		next if (defined($line) && $line =~ /^-/);
		$cnt--;
	}

	return $line;
}

971
972
973
sub cat_vet {
	my ($vet) = @_;
	my ($res, $coded);
974

975
976
977
978
979
980
	$res = '';
	while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
		$res .= $1;
		if ($2 ne '') {
			$coded = sprintf("^%c", unpack('C', $2) + 64);
			$res .= $coded;
981
982
		}
	}
983
	$res =~ s/$/\$/;
984

985
	return $res;
986
987
}

988
my $av_preprocessor = 0;
989
my $av_pending;
990
my @av_paren_type;
991
my $av_pend_colon;
992
993
994

sub annotate_reset {
	$av_preprocessor = 0;
995
996
	$av_pending = '_';
	@av_paren_type = ('E');
997
	$av_pend_colon = 'O';
998
999
}

1000
1001
sub annotate_values {
	my ($stream, $type) = @_;
1002

1003
	my $res;
1004
	my $var = '_' x length($stream);
1005
1006
	my $cur = $stream;

1007
	print "$stream\n" if ($dbg_values > 1);
1008
1009

	while (length($cur)) {
1010
		@av_paren_type = ('E') if ($#av_paren_type < 0);
1011
		print " <" . join('', @av_paren_type) .
1012
				"> <$type> <$av_pending>" if ($dbg_values > 1);
1013
		if ($cur =~ /^(\s+)/o) {
1014
1015
			print "WS($1)\n" if ($dbg_values > 1);
			if ($1 =~ /\n/ && $av_preprocessor) {
1016
				$type = pop(@av_paren_type);
1017
				$av_preprocessor = 0;
1018
1019
			}

1020
		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1021
1022
1023
1024
			print "CAST($1)\n" if ($dbg_values > 1);
			push(@av_paren_type, $type);
			$type = 'C';

1025
		} elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1026
			print "DECLARE($1)\n" if ($dbg_values > 1);
1027
1028
			$type = 'T';

1029
1030
1031
1032
		} elsif ($cur =~ /^($Modifier)\s*/) {
			print "MODIFIER($1)\n" if ($dbg_values > 1);
			$type = 'T';

1033
		} elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1034
			print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1035
			$av_preprocessor = 1;
1036
1037
1038
1039
1040
1041
			push(@av_paren_type, $type);
			if ($2 ne '') {
				$av_pending = 'N';
			}
			$type = 'E';

1042
		} elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1043
1044
1045
			print "UNDEF($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;
			push(@av_paren_type, $type);
1046

1047
		} elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1048
			print "PRE_START($1)\n" if ($dbg_values > 1);
1049
			$av_preprocessor = 1;
1050
1051
1052

			push(@av_paren_type, $type);
			push(@av_paren_type, $type);
1053
			$type = 'E';
1054

1055
		} elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1056
1057
1058
1059
1060
			print "PRE_RESTART($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;

			push(@av_paren_type, $av_paren_type[$#av_paren_type]);

1061
			$type = 'E';
1062

1063
		} elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1064
1065
1066
1067
1068
1069
1070
1071
			print "PRE_END($1)\n" if ($dbg_values > 1);

			$av_preprocessor = 1;

			# Assume all arms of the conditional end as this
			# one does, and continue as if the #endif was not here.
			pop(@av_paren_type);
			push(@av_paren_type, $type);
1072
			$type = 'E';
1073
1074

		} elsif ($cur =~ /^(\\\n)/o) {
1075
			print "PRECONT($1)\n" if ($dbg_values > 1);
1076

1077
1078
1079
1080
1081
		} elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
			print "ATTR($1)\n" if ($dbg_values > 1);
			$av_pending = $type;
			$type = 'N';

1082
		} elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1083
			print "SIZEOF($1)\n" if ($dbg_values > 1);
1084
			if (defined $2) {
1085
				$av_pending = 'V';
1086
1087
1088
			}
			$type = 'N';

1089
		} elsif ($cur =~ /^(if|while|for)\b/o) {
1090
			print "COND($1)\n" if ($dbg_values > 1);
1091
			$av_pending = 'E';
1092
1093
			$type = 'N';

1094
1095
1096
1097
1098
		} elsif ($cur =~/^(case)/o) {
			print "CASE($1)\n" if ($dbg_values > 1);
			$av_pend_colon = 'C';
			$type = 'N';

1099
		} elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1100
			print "KEYWORD($1)\n" if ($dbg_values > 1);
1101
1102
1103
			$type = 'N';

		} elsif ($cur =~ /^(\()/o) {
1104
			print "PAREN('$1')\n" if ($dbg_values > 1);
1105
1106
			push(@av_paren_type, $av_pending);
			$av_pending = '_';
1107
1108
1109
			$type = 'N';

		} elsif ($cur =~ /^(\))/o) {
1110
1111
1112
			my $new_type = pop(@av_paren_type);
			if ($new_type ne '_') {
				$type = $new_type;
1113
1114
				print "PAREN('$1') -> $type\n"
							if ($dbg_values > 1);
1115
			} else {
1116
				print "PAREN('$1')\n" if ($dbg_values > 1);
1117
1118
			}

1119
		} elsif ($cur =~ /^($Ident)\s*\(/o) {
1120
			print "FUNC($1)\n" if ($dbg_values > 1);
1121
			$type = 'V';
1122
			$av_pending = 'V';
1123

1124
1125
		} elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
			if (defined $2 && $type eq 'C' || $type eq 'T') {
1126
				$av_pend_colon = 'B';
1127
1128
			} elsif ($type eq 'E') {
				$av_pend_colon = 'L';
1129
1130
1131
1132
			}
			print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
			$type = 'V';

1133
		} elsif ($cur =~ /^($Ident|$Constant)/o) {
1134
			print "IDENT($1)\n" if ($dbg_values > 1);
1135
1136
1137
			$type = 'V';

		} elsif ($cur =~ /^($Assignment)/o) {
1138
			print "ASSIGN($1)\n" if ($dbg_values > 1);
1139
1140
			$type = 'N';

1141
		} elsif ($cur =~/^(;|{|})/) {
1142
			print "END($1)\n" if ($dbg_values > 1);
1143
			$type = 'E';
1144
1145
			$av_pend_colon = 'O';

1146
1147
1148
1149
		} elsif ($cur =~/^(,)/) {
			print "COMMA($1)\n" if ($dbg_values > 1);
			$type = 'C';

1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
		} elsif ($cur =~ /^(\?)/o) {
			print "QUESTION($1)\n" if ($dbg_values > 1);
			$type = 'N';

		} elsif ($cur =~ /^(:)/o) {
			print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);

			substr($var, length($res), 1, $av_pend_colon);
			if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
				$type = 'E';
			} else {
				$type = 'N';
			}
			$av_pend_colon = 'O';
1164

1165
		} elsif ($cur =~ /^(\[)/o) {
1166
			print "CLOSE($1)\n" if ($dbg_values > 1);
1167
1168
			$type = 'N';

1169
		} elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
			my $variant;

			print "OPV($1)\n" if ($dbg_values > 1);
			if ($type eq 'V') {
				$variant = 'B';
			} else {
				$variant = 'U';
			}

			substr($var, length($res), 1, $variant);
			$type = 'N';

1182
		} elsif ($cur =~ /^($Operators)/o) {
1183
			print "OP($1)\n" if ($dbg_values > 1);
1184
1185
1186
1187
1188
			if ($1 ne '++' && $1 ne '--') {
				$type = 'N';
			}

		} elsif ($cur =~ /(^.)/o) {
1189
			print "C($1)\n" if ($dbg_values > 1);
1190
1191
1192
1193
1194
		}
		if (defined $1) {
			$cur = substr($cur, length($1));
			$res .= $type x length($1);
		}
1195
	}
1196

1197
	return ($res, $var);
1198
1199
}

1200
sub possible {
1201
	my ($possible, $line) = @_;
1202
	my $notPermitted = qr{(?:
1203
1204
1205
1206
		^(?:
			$Modifier|
			$Storage|
			$Type|
1207
1208
1209
			DEFINE_\S+
		)$|
		^(?:
1210
1211
1212
1213
1214
1215
			goto|
			return|
			case|
			else|
			asm|__asm__|
			do
1216
		)(?:\s|$)|