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