checkpatch.pl 98.3 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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my $max_line_length = 80;
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sub help {
	my ($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
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  --max-line-length=n        set the maximum line length, if exceeded, warn
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  --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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	'max-line-length=i' => \$max_line_length,
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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)*};

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our $Constant	= qr{(?i:(?:[0-9]+|0x[0-9a-f]+)[ul]*)};
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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*\([^\)]*\)|
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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 $Typecast	= qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
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# Using $balanced_parens, $LvalOrFunc, or $FuncArg
# requires at least perl version v5.10.0
# Any use must be runtime checked with $^V

our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
our $LvalOrFunc	= qr{($Lval)\s*($balanced_parens{0,1})\s*};
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our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};
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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 @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<$sanitise_quote>\n";
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		if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
			substr($res, $off, 1, $;);
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		} elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
			substr($res, $off, 1, $;);
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		} elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
			substr($res, $off, 1, 'X');
		} else {
			substr($res, $off, 1, $c);
		}
607
608
	}

609
610
611
612
	if ($sanitise_quote eq '//') {
		$sanitise_quote = '';
	}

613
	# The pathname on a #include may be surrounded by '<' and '>'.
614
	if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
615
616
617
618
		my $clean = 'X' x length($1);
		$res =~ s@\<.*\>@<$clean>@;

	# The whole of a #error is a string.
619
	} elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
620
		my $clean = 'X' x length($1);
621
		$res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
622
623
	}

624
625
626
	return $res;
}

627
628
629
630
631
632
sub ctx_statement_block {
	my ($linenr, $remain, $off) = @_;
	my $line = $linenr - 1;
	my $blk = '';
	my $soff = $off;
	my $coff = $off - 1;
633
	my $coff_set = 0;
634

635
636
	my $loff = 0;

637
638
	my $type = '';
	my $level = 0;
639
	my @stack = ();
640
	my $p;
641
642
	my $c;
	my $len = 0;
643
644

	my $remainder;
645
	while (1) {
646
647
		@stack = (['', 0]) if ($#stack == -1);

648
		#warn "CSB: blk<$blk> remain<$remain>\n";
649
650
651
652
		# If we are about to drop off the end, pull in more
		# context.
		if ($off >= $len) {
			for (; $remain > 0; $line++) {
653
				last if (!defined $lines[$line]);
654
				next if ($lines[$line] =~ /^-/);
655
				$remain--;
656
				$loff = $len;
657
				$blk .= $lines[$line] . "\n";
658
659
660
661
662
663
				$len = length($blk);
				$line++;
				last;
			}
			# Bail if there is no further context.
			#warn "CSB: blk<$blk> off<$off> len<$len>\n";
664
			if ($off >= $len) {
665
666
				last;
			}
667
668
669
670
			if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
				$level++;
				$type = '#';
			}
671
		}
672
		$p = $c;
673
		$c = substr($blk, $off, 1);
674
		$remainder = substr($blk, $off);
675

676
		#warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
677
678
679
680
681
682
683
684
685
686

		# 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)};
		}

687
688
689
690
691
692
		# Statement ends at the ';' or a close '}' at the
		# outermost level.
		if ($level == 0 && $c eq ';') {
			last;
		}

693
		# An else is really a conditional as long as its not else if
694
695
696
697
698
699
700
701
		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";
702
703
		}

704
705
706
707
708
709
710
711
712
713
		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;
714
715
				$coff_set = 1;
				#warn "CSB: mark coff<$coff>\n";
716
717
718
719
720
721
722
723
724
725
726
			}
		}
		if (($type eq '' || $type eq '{') && $c eq '{') {
			$level++;
			$type = '{';
		}
		if ($type eq '{' && $c eq '}') {
			$level--;
			$type = ($level != 0)? '{' : '';

			if ($level == 0) {
727
728
729
				if (substr($blk, $off + 1, 1) eq ';') {
					$off++;
				}
730
731
732
				last;
			}
		}
733
734
735
736
737
738
739
		# Preprocessor commands end at the newline unless escaped.
		if ($type eq '#' && $c eq "\n" && $p ne "\\") {
			$level--;
			$type = '';
			$off++;
			last;
		}
740
741
		$off++;
	}
742
	# We are truly at the end, so shuffle to the next line.
743
	if ($off == $len) {
744
		$loff = $len + 1;
745
746
747
		$line++;
		$remain--;
	}
748
749
750
751
752
753
754

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

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

755
	#print "coff<$coff> soff<$off> loff<$loff>\n";
756
757
758
759
760

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

761
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
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;
	}
}

804
805
806
807
808
809
sub ctx_statement_full {
	my ($linenr, $remain, $off) = @_;
	my ($statement, $condition, $level);

	my (@chunks);

810
	# Grab the first conditional/block pair.
811
812
	($statement, $condition, $linenr, $remain, $off, $level) =
				ctx_statement_block($linenr, $remain, $off);
813
	#print "F: c<$condition> s<$statement> remain<$remain>\n";
814
815
816
817
818
819
820
	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.
821
822
823
	for (;;) {
		($statement, $condition, $linenr, $remain, $off, $level) =
				ctx_statement_block($linenr, $remain, $off);
824
		#print "C: c<$condition> s<$statement> remain<$remain>\n";
825
		last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
826
827
		#print "C: push\n";
		push(@chunks, [ $condition, $statement ]);
828
829
830
	}

	return ($level, $linenr, @chunks);
831
832
}

833
sub ctx_block_get {
834
	my ($linenr, $remain, $outer, $open, $close, $off) = @_;
835
836
837
838
839
840
841
	my $line;
	my $start = $linenr - 1;
	my $blk = '';
	my @o;
	my @c;
	my @res = ();

842
	my $level = 0;
843
	my @stack = ($level);
844
845
846
847
848
	for ($line = $start; $remain > 0; $line++) {
		next if ($rawlines[$line] =~ /^-/);
		$remain--;

		$blk .= $rawlines[$line];
849
850

		# Handle nested #if/#else.
851
		if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
852
			push(@stack, $level);
853
		} elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
854
			$level = $stack[$#stack - 1];
855
		} elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
856
857
858
			$level = pop(@stack);
		}

859
		foreach my $c (split(//, $lines[$line])) {
860
861
862
863
864
			##print "C<$c>L<$level><$open$close>O<$off>\n";
			if ($off > 0) {
				$off--;
				next;
			}
865

866
867
868
869
870
871
872
			if ($c eq $close && $level > 0) {
				$level--;
				last if ($level == 0);
			} elsif ($c eq $open) {
				$level++;
			}
		}
873

874
		if (!$outer || $level <= 1) {
875
			push(@res, $rawlines[$line]);
876
877
		}

878
		last if ($level == 0);
879
880
	}

881
	return ($level, @res);
882
883
884
885
}
sub ctx_block_outer {
	my ($linenr, $remain) = @_;

886
887
	my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
	return @r;
888
889
890
891
}
sub ctx_block {
	my ($linenr, $remain) = @_;

892
893
	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
	return @r;
894
895
}
sub ctx_statement {
896
897
898
899
900
901
	my ($linenr, $remain, $off) = @_;

	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
	return @r;
}
sub ctx_block_level {
902
903
	my ($linenr, $remain) = @_;

904
	return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
905
}
906
907
908
909
910
sub ctx_statement_level {
	my ($linenr, $remain, $off) = @_;

	return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
}
911
912
913
914
915

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

	# Catch a comment on the end of the line itself.
916
	my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
917
918
919
920
921
922
923
	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++) {
924
925
		my $line = $rawlines[$linenr - 1];
		#warn "           $line\n";
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
		if ($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);

948
	##print "LINE: $rawlines[$end_line - 1 ]\n";
949
950
951
952
953
	##print "CMMT: $cmt\n";

	return ($cmt ne '');
}

954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
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;
}

970
971
972
sub cat_vet {
	my ($vet) = @_;
	my ($res, $coded);
973

974
975
976
977
978
979
	$res = '';
	while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
		$res .= $1;
		if ($2 ne '') {
			$coded = sprintf("^%c", unpack('C', $2) + 64);
			$res .= $coded;
980
981
		}
	}
982
	$res =~ s/$/\$/;
983

984
	return $res;
985
986
}

987
my $av_preprocessor = 0;
988
my $av_pending;
989
my @av_paren_type;
990
my $av_pend_colon;
991
992
993

sub annotate_reset {
	$av_preprocessor = 0;
994
995
	$av_pending = '_';
	@av_paren_type = ('E');
996
	$av_pend_colon = 'O';
997
998
}

999
1000
sub annotate_values {
	my ($stream, $type) = @_;
1001

1002
	my $res;
1003
	my $var = '_' x length($stream);
1004
1005
	my $cur = $stream;

1006
	print "$stream\n" if ($dbg_values > 1);
1007
1008

	while (length($cur)) {
1009
		@av_paren_type = ('E') if ($#av_paren_type < 0);
1010
		print " <" . join('', @av_paren_type) .
1011
				"> <$type> <$av_pending>" if ($dbg_values > 1);
1012
		if ($cur =~ /^(\s+)/o) {
1013
1014
			print "WS($1)\n" if ($dbg_values > 1);
			if ($1 =~ /\n/ && $av_preprocessor) {
1015
				$type = pop(@av_paren_type);
1016
				$av_preprocessor = 0;
1017
1018
			}

1019
		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1020
1021
			print "CAST($1)\n" if ($dbg_values > 1);
			push(@av_paren_type, $type);
1022
			$type = 'c';
1023

1024
		} elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1025
			print "DECLARE($1)\n" if ($dbg_values > 1);
1026
1027
			$type = 'T';

1028
1029
1030
1031
		} elsif ($cur =~ /^($Modifier)\s*/) {
			print "MODIFIER($1)\n" if ($dbg_values > 1);
			$type = 'T';

1032
		} elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1033
			print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1034
			$av_preprocessor = 1;
1035
1036
1037
1038
1039
1040
			push(@av_paren_type, $type);
			if ($2 ne '') {
				$av_pending = 'N';
			}
			$type = 'E';

1041
		} elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1042
1043
1044
			print "UNDEF($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;
			push(@av_paren_type, $type);
1045

1046
		} elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1047
			print "PRE_START($1)\n" if ($dbg_values > 1);
1048
			$av_preprocessor = 1;
1049
1050
1051

			push(@av_paren_type, $type);
			push(@av_paren_type, $type);
1052
			$type = 'E';
1053

1054
		} elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1055
1056
1057
1058
1059
			print "PRE_RESTART($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;

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

1060
			$type = 'E';
1061

1062
		} elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1063
1064
1065
1066
1067
1068
1069
1070
			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);
1071
			$type = 'E';
1072
1073

		} elsif ($cur =~ /^(\\\n)/o) {
1074
			print "PRECONT($1)\n" if ($dbg_values > 1);
1075

1076
1077
1078
1079
1080
		} elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
			print "ATTR($1)\n" if ($dbg_values > 1);
			$av_pending = $type;
			$type = 'N';

1081
		} elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1082
			print "SIZEOF($1)\n" if ($dbg_values > 1);
1083
			if (defined $2) {
1084
				$av_pending = 'V';
1085
1086
1087
			}
			$type = 'N';

1088
		} elsif ($cur =~ /^(if|while|for)\b/o) {
1089
			print "COND($1)\n" if ($dbg_values > 1);
1090
			$av_pending = 'E';
1091
1092
			$type = 'N';

1093
1094
1095
1096
1097
		} elsif ($cur =~/^(case)/o) {
			print "CASE($1)\n" if ($dbg_values > 1);
			$av_pend_colon = 'C';
			$type = 'N';

1098
		} elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1099
			print "KEYWORD($1)\n" if ($dbg_values > 1);
1100
1101
1102
			$type = 'N';

		} elsif ($cur =~ /^(\()/o) {
1103
			print "PAREN('$1')\n" if ($dbg_values > 1);
1104
1105
			push(@av_paren_type, $av_pending);
			$av_pending = '_';
1106
1107
1108
			$type = 'N';

		} elsif ($cur =~ /^(\))/o) {
1109
1110
1111
			my $new_type = pop(@av_paren_type);
			if ($new_type ne '_') {
				$type = $new_type;
1112
1113
				print "PAREN('$1') -> $type\n"
							if ($dbg_values > 1);
1114
			} else {
1115
				print "PAREN('$1')\n" if ($dbg_values > 1);
1116
1117
			}

1118
		} elsif ($cur =~ /^($Ident)\s*\(/o) {
1119
			print "FUNC($1)\n" if ($dbg_values > 1);
1120
			$type = 'V';
1121
			$av_pending = 'V';
1122

1123
1124
		} elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
			if (defined $2 && $type eq 'C' || $type eq 'T') {
1125
				$av_pend_colon = 'B';
1126
1127
			} elsif ($type eq 'E') {
				$av_pend_colon = 'L';
1128
1129
1130
1131
			}
			print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
			$type = 'V';

1132
		} elsif ($cur =~ /^($Ident|$Constant)/o) {
1133
			print "IDENT($1)\n" if ($dbg_values > 1);
1134
1135
1136
			$type = 'V';

		} elsif ($cur =~ /^($Assignment)/o) {
1137
			print "ASSIGN($1)\n" if ($dbg_values > 1);
1138
1139
			$type = 'N';

1140
		} elsif ($cur =~/^(;|{|})/) {
1141
			print "END($1)\n" if ($dbg_values > 1);
1142
			$type = 'E';
1143
1144
			$av_pend_colon = 'O';

1145
1146
1147
1148
		} elsif ($cur =~/^(,)/) {
			print "COMMA($1)\n" if ($dbg_values > 1);
			$type = 'C';

1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
		} 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';
1163

1164
		} elsif ($cur =~ /^(\[)/o) {
1165
			print "CLOSE($1)\n" if ($dbg_values > 1);
1166
1167
			$type = 'N';

1168
		} elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
			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';

1181
		} elsif ($cur =~ /^($Operators)/o) {
1182
			print "OP($1)\n" if ($dbg_values > 1);
1183
1184
1185
1186
1187
			if ($1 ne '++' && $1 ne '--') {
				$type = 'N';
			}

		} elsif ($cur =~ /(^.)/o) {
1188
			print "C($1)\n" if ($dbg_values > 1);
1189
1190
1191
1192
1193
		}
		if (defined $1) {
			$cur = substr($cur, length($1));
			$res .= $type x length($1);
		}
1194
	}
1195

1196
	return ($res, $var);
1197
1198
}

1199
sub possible {
1200
	my ($possible, $line) = @_;
1201
	my $notPermitted = qr{(?:
1202
1203
1204
1205
		^(?:
			$Modifier|
			$Storage|
			$Type|
1206
1207
1208
			DEFINE_\S+
		)$|
		^(?: