src/util/diffsize.pl

   1 #!/usr/bin/perl -w
   2 # usage:
   3 # [somebody@somewhere ~/gpxe/src]$ ./util/diffsize.pl [<old rev> [<new rev>]]
   4 # by default <old rev> is HEAD and <new rev> is the working tree
   5
   6 use strict;
   7
   8 -d "bin" or die "Please run me in the gPXE src directory\n";
   9 mkdir ".sizes";
  10
  11 my($oldrev, $newrev);
  12 my($oldname, $newname);
  13
  14 if (@ARGV) {
  15   $oldname = shift;
  16 } else {
  17   $oldname = "HEAD";
  18 }
  19
  20 if (@ARGV) {
  21   $newname = shift;
  22 } else {
  23   $newrev = "tree" . time();
  24 }
  25
  26 $oldrev = `git rev-parse $oldname`;
  27 chomp $oldrev;
  28
  29 unless (defined $newrev) {
  30   $newrev = `git rev-parse $newname`;
  31   chomp $newrev;
  32 }
  33
  34 sub calc_sizes($$) {
  35   my($name, $rev) = @_;
  36   my $output;
  37   my $lastrev;
  38   my $stashed = 0;
  39   my $res = 0;
  40
  41   return if -e ".sizes/$rev.sizes";
  42
  43   if (defined $name) {
  44     $output = `git stash`;
  45     $stashed = 1 unless $output =~ /No local changes to save/;
  46     $lastrev = `git name-rev --name-only HEAD`;
  47     system("git checkout $name >/dev/null"); $res ||= $?;
  48   }
  49
  50   system("make -j4 bin/gpxe.lkrn >/dev/null"); $res ||= $?;
  51   system("make bin/gpxe.lkrn.sizes > .sizes/$rev.sizes"); $res ||= $?;
  52
  53   if (defined $name) {
  54     system("git checkout $lastrev >/dev/null"); $res ||= $?;
  55     system("git stash pop >/dev/null") if $stashed; $res ||= $?;
  56   }
  57
  58   if ($res) {
  59     unlink(".sizes/$rev.sizes");
  60     die "Error making sizes file\n";
  61   }
  62 }
  63
  64 our %Sizes;
  65
  66 sub save_sizes($$) {
  67   my($id, $rev) = @_;
  68   my $file = ".sizes/$rev.sizes";
  69
  70   open SIZES, $file or die "opening $file: $!\n";
  71   while (<SIZES>) {
  72     my($text, $data, $bss, $total, $hex, $name) = split;
  73     $name =~ s|bin/||; $name =~ s|\.o$||;
  74
  75     # Skip the header and totals lines
  76     next if $total =~ /[a-z]/ or $name =~ /TOTALS/;
  77
  78     # Skip files named with dash, due to old Makefile bug
  79     next if $name =~ /-/;
  80
  81     $Sizes{$name} = {old => 0, new => 0} unless exists $Sizes{$name};
  82     $Sizes{$name}{$id} = $total;
  83   }
  84 }
  85
  86 calc_sizes($oldname, $oldrev);
  87 calc_sizes($newname, $newrev);
  88
  89 save_sizes('old', $oldrev);
  90 save_sizes('new', $newrev);
  91
  92 my $total = 0;
  93
  94 for (sort keys %Sizes) {
  95   my $diff = $Sizes{$_}{new} - $Sizes{$_}{old};
  96   if (abs($diff) >= 16) {
  97     printf "%12s %+d\n", substr($_, 0, 12), $Sizes{$_}{new} - $Sizes{$_}{old};
  98   }
  99   $total += $diff;
 100 }
 101 printf "      TOTAL: %+d\n", $total;