maint/unrefglobals.pl

   1 #!/usr/bin/perl
   2
   3 # Copyright (c) 2003, Pavel Roskin
   4 # This script is Free Software, and it can be copied, distributed and
   5 # modified as defined in the GNU General Public License.  A copy of
   6 # its license can be downloaded from http://www.gnu.org/copyleft/gpl.html
   7
   8 # Run this script on the map with cross-reference generated by GNU ld,
   9 # and it will generate a list of symbols that don't need to be global.
  10 # To create the map, run something like this:
  11 # make LDFLAGS=-Wl,-Map,output.map,--cref
  12
  13 use strict;
  14
  15 my %symbols;
  16 my %syms;
  17 my %objs;
  18
  19 if ($#ARGV != 0) {
  20         print "Usage: unrefglobals.pl mapfile\n";
  21         exit 1;
  22 }
  23
  24 if (!open (MAP, "$ARGV[0]")) {
  25         print "Cannot open file \"$ARGV[0]\"\n";
  26         exit 1;
  27 }
  28
  29 my $line;
  30 my $next_line = <MAP>;
  31 while (1) {
  32         last unless $next_line;
  33         $line = $next_line;
  34         $next_line = <MAP>;
  35         next unless ($line =~ m{^[A-Za-z_][A-Za-z0-9_]*  +[^ /][^ ]+\.o$} or
  36                      $line =~ m{^[A-Za-z_][A-Za-z0-9_]*  +[^ /][^ ]+\.a\([^ ]+\.o\)$});
  37         if (!$next_line or ($next_line !~ /^ /)) {
  38                 my @arr = split (' ', $line);
  39                 $symbols{$arr[0]} = $arr[1];
  40                 $syms{$arr[0]} = 1;
  41                 $objs{$arr[1]} = 1;
  42         }
  43 }
  44
  45 close(MAP);
  46
  47 foreach my $obj (sort keys %objs) {
  48         print "$obj\n";
  49         foreach my $sym (sort keys %syms) {
  50                 print "\t$sym\n" if ($symbols{$sym} eq $obj);
  51         }
  52 }