hxtools/sdevel/sourcefuncsize

#!/usr/bin/perl
# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2005-2007 Jan Engelhardt
#
#	sourcefuncsize - classify source code
#
use Getopt::Long;
use strict;
my($Color, $Ext, $Verbose, $Sort_type, $Empty);

&Getopt::Long::Configure(qw(bundling pass_through));
&GetOptions(
	"b"  => sub { $Sort_type = 0; },
	"c"  => \$Color,
	"e+" => \$Empty,
	"l"  => sub { $Sort_type = 1; },
	"v"  => \$Verbose,
	"x"  => \$Ext,
);

#
# We can use \^\w+ as segment identifiers as they can not clash with function
# names.
#
my %COLOR = (
	"^pre"   => "\e[1;31m",
	"^other" => "\e[0;34m",
	"^cm"    => "\e[1;33m",
	"^lcm"   => "\e[1;33m",
	"^empty" => "\e[1;30m",
);
my %SEG_MAP = (
	"^pre"   => "[Preprocessor]",
	"^other" => "[Other data]",
	"^cm"    => "[Comments]",
	"^lcm"   => "[Comments]",
	"^empty" => "[Empty lines]",
);

#
# The regex which matches function starts (well, not if you use fancy extras)
#
my $FUNC_RX = qr/^
	(?:inline\s+)?
	(?:static\s+)?
	(?:inline\s+)? # inline can be before static or after static
	(?:const\s+)?
	(?:
		# certain mixtures of (un)signed with {char,short,long} and int
		(?:(?:un)?signed)?\s+(?:char|byte|short|long) |
		(?:(?:un)?signed)?\s+(?:(?:short|long)\s+)?int |
		\w+ |                   # other atomic type, maybe typedef
		(?:struct|union)\s+\w+  # aggregates
	)
	(?:
		\s*\*+\s* |             # returns pointer
		\s+                     # returns type
	)
	(\w+(?:::\w+)*)                           # function name
	\s*\(\s*.*?\s*\)                # function args
	(?:\s*const)?
	\s*\{
/xs;

&main();

#------------------------------------------------------------------------------
sub main ()
{
	my($func, $total) = &analyze_data(<STDIN>);
	&print_results($func, $total);
	return;
}

sub analyze_data ()
{
	my %cnt_func;           # lines/bytes usage per function
	my %cnt_total;          # simple total of lines/bytes
	my $cur_seg = "^other"; # segment to which current line belongs
	my @saved_seg;
	my $stops = 0;          # lines to wait for returning to $saved_seg
	                        # (used for multi-line function introducers)
	my $seg_lcomm = 0;      # we are in a /* */ comment block
	my $depth = 0;          # brace tracker for finding start/end of func
	my $depth_track = 0;

	for ($. = 0; $. <= $#_; ++$.) {
		my $ln = $_[$.];

		if ($Ext) {
			#
			# enhanced recognition
			#
			if ($ln =~ m[^\s*#]so) {
				push(@saved_seg, $cur_seg);
				$cur_seg = "^pre";
			} elsif ($ln =~ m[^\s*/\*.*?\*/\s*$]so) {
				#
				# one-line /* */ comment, with no code
				#
				push(@saved_seg, $cur_seg);
				$cur_seg = "^cm";
			} elsif ($ln =~ m[/\*.*?\*/]so) {
				#
				# one-line /* */ comment, with possibly code in
				# the same line thus, do nothing here
				#
			} elsif ($ln =~ m[^\s*//]so) {
				push(@saved_seg, $cur_seg);
				$cur_seg = "^cm";
			} elsif ($ln =~ m[^\s*/\*]so) {
				#
				# multi-line /* */ comment
				#
				push(@saved_seg, $cur_seg);
				$cur_seg = "^lcm";
				++$seg_lcomm;
			} elsif ($ln =~ m[\*/]so) {
				$seg_lcomm = 0;
			} elsif ($Empty) {
				my $s;
				chomp($s = $ln);
				if ($s =~ /^\s*$/so && ($cur_seg eq "^other" ||
				    $Empty > 1)) {
					push(@saved_seg, $cur_seg);
					$cur_seg = "^empty";
					$stops = 0;
				}
			}
		}

		#
		# There just is no meaning in having function introducers in
		# preprocessor commands or comments other than for preprocessor
		# or commentary purposes.
		#
		if ($cur_seg !~ /^\^(?:pre|l?cm)$/iso) {
			if ($ln =~ $FUNC_RX) {
				push(@saved_seg, $cur_seg);
				$cur_seg = $1;
				$stops = 1;
				++$depth_track;
			} elsif (join($/, @_[$...($.+1)]) =~ $FUNC_RX) {
				# A retry for a two-line introducer.
				# (If you have an introducer longer than this, you should
				# really consider another programming style.)
				push(@saved_seg, $cur_seg);
				$cur_seg = $1;
				$stops = 2;
				++$depth_track;
			}
		}

		my $b_open  = $ln =~ tr/\{/\{/;
		my $b_close = $ln =~ tr/\}/\}/;
		$depth += $b_open - $b_close;

		#
		# Increment the usage count for the current segment or function
		#
		my $cname_seg = $SEG_MAP{$cur_seg};
		if (!defined($cname_seg)) {
			$cname_seg = $cur_seg;
		}
		$cnt_func{$cname_seg}{b} += length $ln;
		$cnt_total{b} += length $ln;
		++$cnt_func{$cname_seg}{l};
		++$cnt_total{l};

		if ($Verbose) {
			if ($Color) {
				my $s = $COLOR{$cur_seg};
				print $s ? $s : "\e[0;32m";
			}
			my $sb = sprintf "%s:%-3d", $cname_seg, $cnt_func{$cname_seg}{l};
			printf "<%4d>%-25s\t", $. + 1, $sb;
			print $ln;
			if ($Color) {
				print "\e[0m";
			}
		}

		if ($cur_seg =~ /^\^(?:cm|pre|empty)$/iso ||
		    ($cur_seg eq "^lcm" && !$seg_lcomm)) {
			$cur_seg = pop @saved_seg;
			next;
		}

		if ($seg_lcomm == 0 && --$stops <= 0 && (
		    (!$depth_track || ($depth_track && $depth == 0)))) {
			#
			# Only discard the current function when depth == 0
			#
			my $oldseg = pop @saved_seg;
			if (defined $oldseg) {
				$cur_seg = $oldseg;
			}
		}
	}

	return(\%cnt_func, \%cnt_total);
}

sub print_results ()
{
	my %func  = %{shift @_};
	my %total = %{shift @_};

	printf "%6s           %6s           %s\n", "BYTES", "LINES", "FUNCTION";

	foreach my $n (sort { !$Sort_type ? $func{$b}{b} <=> $func{$a}{b} :
	    $func{$b}{l} <=> $func{$a}{l}; } keys %func)
	{
		printf "%6d(%6.2f%%)  %6d(%6.2f%%)  %s\n",
		       $func{$n}{b}, $func{$n}{b} * 100 / $total{b},
		       $func{$n}{l}, $func{$n}{l} * 100 / $total{l}, $n;
	}

	return;
}