xref: /linux/scripts/export_report.pl (revision 08f3e0873ac203449465c2b8473d684e2f9f41d1) 
1#!/usr/bin/env perl
2# SPDX-License-Identifier: GPL-2.0-only
3#
4# (C) Copyright IBM Corporation 2006.
5#	Author : Ram Pai (linuxram@us.ibm.com)
6#
7# Usage: export_report.pl -k Module.symvers [-o report_file ] -f *.mod.c
8#
9
10use warnings;
11use Getopt::Std;
12use strict;
13
14sub numerically {
15	my $no1 = (split /\s+/, $a)[1];
16	my $no2 = (split /\s+/, $b)[1];
17	return $no1 <=> $no2;
18}
19
20sub alphabetically {
21	my ($module1, $value1) = @{$a};
22	my ($module2, $value2) = @{$b};
23	return $value1 <=> $value2 || $module2 cmp $module1;
24}
25
26sub print_depends_on {
27	my ($href) = @_;
28	print "\n";
29	for my $mod (sort keys %$href) {
30		my $list = $href->{$mod};
31		print "\t$mod:\n";
32		foreach my $sym (sort numerically @{$list}) {
33			my ($symbol, $no) = split /\s+/, $sym;
34			printf("\t\t%-25s\n", $symbol);
35		}
36		print "\n";
37	}
38	print "\n";
39	print "~"x80 , "\n";
40}
41
42sub usage {
43        print "Usage: @_ -h -k Module.symvers  [ -o outputfile ] \n",
44	      "\t-f: treat all the non-option argument as .mod.c files. ",
45	      "Recommend using this as the last option\n",
46	      "\t-h: print detailed help\n",
47	      "\t-k: the path to Module.symvers file. By default uses ",
48	      "the file from the current directory\n",
49	      "\t-o outputfile: output the report to outputfile\n";
50	exit 0;
51}
52
53sub collectcfiles {
54    my @file;
55    open my $fh, '< modules.order' or die "cannot open modules.order: $!\n";
56    while (<$fh>) {
57	s/\.ko$/.mod.c/;
58	push (@file, $_)
59    }
60    close($fh);
61    chomp @file;
62    return @file;
63}
64
65my (%SYMBOL, %MODULE, %opt, @allcfiles);
66
67if (not getopts('hk:o:f',\%opt) or defined $opt{'h'}) {
68        usage($0);
69}
70
71if (defined $opt{'f'}) {
72	@allcfiles = @ARGV;
73} else {
74	@allcfiles = collectcfiles();
75}
76
77if (not defined $opt{'k'}) {
78	$opt{'k'} = "Module.symvers";
79}
80
81open (my $module_symvers, '<', $opt{'k'})
82    or die "Sorry, cannot open $opt{'k'}: $!\n";
83
84if (defined $opt{'o'}) {
85    open (my $out, '>', $opt{'o'})
86	or die "Sorry, cannot open $opt{'o'} $!\n";
87
88    select $out;
89}
90
91#
92# collect all the symbols and their attributes from the
93# Module.symvers file
94#
95while ( <$module_symvers> ) {
96	chomp;
97	my (undef, $symbol, $module, $gpl, $namespace) = split('\t');
98	$SYMBOL { $symbol } =  [ $module , "0" , $symbol, $gpl];
99}
100close($module_symvers);
101
102#
103# collect the usage count of each symbol.
104#
105my $modversion_warnings = 0;
106
107foreach my $thismod (@allcfiles) {
108	my $module;
109
110	unless (open ($module, '<', $thismod)) {
111		warn "Sorry, cannot open $thismod: $!\n";
112		next;
113	}
114
115	my $state=0;
116	while ( <$module> ) {
117		chomp;
118		if ($state == 0) {
119			$state = 1 if ($_ =~ /static const struct modversion_info/);
120			next;
121		}
122		if ($state == 1) {
123			$state = 2 if ($_ =~ /__attribute__\(\(section\("__versions"\)\)\)/);
124			next;
125		}
126		if ($state == 2) {
127			if ( $_ !~ /0x[0-9a-f]+,/ ) {
128				next;
129			}
130			my $sym = (split /([,"])/,)[4];
131			my ($module, $value, $symbol, $gpl) = @{$SYMBOL{$sym}};
132			$SYMBOL{ $sym } =  [ $module, $value+1, $symbol, $gpl];
133			push(@{$MODULE{$thismod}} , $sym);
134		}
135	}
136	if ($state != 2) {
137		warn "WARNING:$thismod is not built with CONFIG_MODVERSIONS enabled\n";
138		$modversion_warnings++;
139	}
140	close($module);
141}
142
143print "\tThis file reports the exported symbols usage patterns by in-tree\n",
144	"\t\t\t\tmodules\n";
145printf("%s\n\n\n","x"x80);
146printf("\t\t\t\tINDEX\n\n\n");
147printf("SECTION 1: Usage counts of all exported symbols\n");
148printf("SECTION 2: List of modules and the exported symbols they use\n");
149printf("%s\n\n\n","x"x80);
150printf("SECTION 1:\tThe exported symbols and their usage count\n\n");
151printf("%-25s\t%-25s\t%-5s\t%-25s\n", "Symbol", "Module", "Usage count",
152	"export type");
153
154#
155# print the list of unused exported symbols
156#
157foreach my $list (sort alphabetically values(%SYMBOL)) {
158	my ($module, $value, $symbol, $gpl) = @{$list};
159	printf("%-25s\t%-25s\t%-10s\t", $symbol, $module, $value);
160	if (defined $gpl) {
161		printf("%-25s\n",$gpl);
162	} else {
163		printf("\n");
164	}
165}
166printf("%s\n\n\n","x"x80);
167
168printf("SECTION 2:\n\tThis section reports export-symbol-usage of in-kernel
169modules. Each module lists the modules, and the symbols from that module that
170it uses.  Each listed symbol reports the number of modules using it\n");
171
172print "\nNOTE: Got $modversion_warnings CONFIG_MODVERSIONS warnings\n\n"
173    if $modversion_warnings;
174
175print "~"x80 , "\n";
176for my $thismod (sort keys %MODULE) {
177	my $list = $MODULE{$thismod};
178	my %depends;
179	$thismod =~ s/\.mod\.c/.ko/;
180	print "\t\t\t$thismod\n";
181	foreach my $symbol (@{$list}) {
182		my ($module, $value, undef, $gpl) = @{$SYMBOL{$symbol}};
183		push (@{$depends{"$module"}}, "$symbol $value");
184	}
185	print_depends_on(\%depends);
186}
187