scripts/export_report.pl

   1 #!/usr/bin/perl -w
   2 #
   3 # (C) Copyright IBM Corporation 2006.
   4 #       Released under GPL v2.
   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
  10 use Getopt::Std;
  11 use strict;
  12
  13 sub numerically {
  14         my $no1 = (split /\s+/, $a)[1];
  15         my $no2 = (split /\s+/, $b)[1];
  16         return $no1 <=> $no2;
  17 }
  18
  19 sub alphabetically {
  20         my ($module1, $value1) = @{$a};
  21         my ($module2, $value2) = @{$b};
  22         return $value1 <=> $value2 || $module2 cmp $module1;
  23 }
  24
  25 sub print_depends_on {
  26         my ($href) = @_;
  27         print "\n";
  28         while (my ($mod, $list) = each %$href) {
  29                 print "\t$mod:\n";
  30                 foreach my $sym (sort numerically @{$list}) {
  31                         my ($symbol, $no) = split /\s+/, $sym;
  32                         printf("\t\t%-25s\t%-25d\n", $symbol, $no);
  33                 }
  34                 print "\n";
  35         }
  36         print "\n";
  37         print "~"x80 , "\n";
  38 }
  39
  40 sub usage {
  41         print "Usage: @_ -h -k Module.symvers  [ -o outputfile ] \n",
  42               "\t-f: treat all the non-option argument as .mod.c files. ",
  43               "Recommend using this as the last option\n",
  44               "\t-h: print detailed help\n",
  45               "\t-k: the path to Module.symvers file. By default uses ",
  46               "the file from the current directory\n",
  47               "\t-o outputfile: output the report to outputfile\n";
  48         exit 0;
  49 }
  50
  51 sub collectcfiles {
  52         my @file = `cat .tmp_versions/*.mod | grep '.*\.ko\$'`;
  53         @file = grep {s/\.ko/.mod.c/} @file;
  54         chomp @file;
  55         return @file;
  56 }
  57
  58 my (%SYMBOL, %MODULE, %opt, @allcfiles);
  59
  60 if (not getopts('hk:o:f',\%opt) or defined $opt{'h'}) {
  61         usage($0);
  62 }
  63
  64 if (defined $opt{'f'}) {
  65         @allcfiles = @ARGV;
  66 } else {
  67         @allcfiles = collectcfiles();
  68 }
  69
  70 if (not defined $opt{'k'}) {
  71         $opt{'k'} = "Module.symvers";
  72 }
  73
  74 unless (open(MODULE_SYMVERS, $opt{'k'})) {
  75         die "Sorry, cannot open $opt{'k'}: $!\n";
  76 }
  77
  78 if (defined $opt{'o'}) {
  79         unless (open(OUTPUT_HANDLE, ">$opt{'o'}")) {
  80                 die "Sorry, cannot open $opt{'o'} $!\n";
  81         }
  82         select OUTPUT_HANDLE;
  83 }
  84 #
  85 # collect all the symbols and their attributes from the
  86 # Module.symvers file
  87 #
  88 while ( <MODULE_SYMVERS> ) {
  89         chomp;
  90         my (undef, $symbol, $module, $gpl) = split;
  91         $SYMBOL { $symbol } =  [ $module , "0" , $symbol, $gpl];
  92 }
  93 close(MODULE_SYMVERS);
  94
  95 #
  96 # collect the usage count of each symbol.
  97 #
  98 foreach my $thismod (@allcfiles) {
  99         unless (open(MODULE_MODULE, $thismod)) {
 100                 print "Sorry, cannot open $thismod: $!\n";
 101                 next;
 102         }
 103         my $state=0;
 104         while ( <MODULE_MODULE> ) {
 105                 chomp;
 106                 if ($state == 0) {
 107                         $state = 1 if ($_ =~ /static const struct modversion_info/);
 108                         next;
 109                 }
 110                 if ($state == 1) {
 111                         $state = 2 if ($_ =~ /__attribute__\(\(section\("__versions"\)\)\)/);
 112                         next;
 113                 }
 114                 if ($state == 2) {
 115                         if ( $_ !~ /0x[0-9a-f]+,/ ) {
 116                                 next;
 117                         }
 118                         my $sym = (split /([,"])/,)[4];
 119                         my ($module, $value, $symbol, $gpl) = @{$SYMBOL{$sym}};
 120                         $SYMBOL{ $sym } =  [ $module, $value+1, $symbol, $gpl];
 121                         push(@{$MODULE{$thismod}} , $sym);
 122                 }
 123         }
 124         if ($state != 2) {
 125                 print "WARNING:$thismod is not built with CONFIG_MODVERSION enabled\n";
 126         }
 127         close(MODULE_MODULE);
 128 }
 129
 130 print "\tThis file reports the exported symbols usage patterns by in-tree\n",
 131         "\t\t\t\tmodules\n";
 132 printf("%s\n\n\n","x"x80);
 133 printf("\t\t\t\tINDEX\n\n\n");
 134 printf("SECTION 1: Usage counts of all exported symbols\n");
 135 printf("SECTION 2: List of modules and the exported symbols they use\n");
 136 printf("%s\n\n\n","x"x80);
 137 printf("SECTION 1:\tThe exported symbols and their usage count\n\n");
 138 printf("%-25s\t%-25s\t%-5s\t%-25s\n", "Symbol", "Module", "Usage count",
 139         "export type");
 140
 141 #
 142 # print the list of unused exported symbols
 143 #
 144 foreach my $list (sort alphabetically values(%SYMBOL)) {
 145         my ($module, $value, $symbol, $gpl) = @{$list};
 146         printf("%-25s\t%-25s\t%-10s\t", $symbol, $module, $value);
 147         if (defined $gpl) {
 148                 printf("%-25s\n",$gpl);
 149         } else {
 150                 printf("\n");
 151         }
 152 }
 153 printf("%s\n\n\n","x"x80);
 154
 155 printf("SECTION 2:\n\tThis section reports export-symbol-usage of in-kernel
 156 modules. Each module lists the modules, and the symbols from that module that
 157 it uses.  Each listed symbol reports the number of modules using it\n");
 158
 159 print "~"x80 , "\n";
 160 while (my ($thismod, $list) = each %MODULE) {
 161         my %depends;
 162         $thismod =~ s/\.mod\.c/.ko/;
 163         print "\t\t\t$thismod\n";
 164         foreach my $symbol (@{$list}) {
 165                 my ($module, $value, undef, $gpl) = @{$SYMBOL{$symbol}};
 166                 push (@{$depends{"$module"}}, "$symbol $value");
 167         }
 168         print_depends_on(\%depends);
 169 }