Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Browse files
Browse the repository at this point in the history
[util] Add diffsize.pl utility for generating diffs of object sizes
This is useful when comparing size optimizations. Signed-off-by: Marty Connor <mdc@etherboot.org>
- Loading branch information
Showing
1 changed file
with
101 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,101 @@ | ||
#!/usr/bin/perl -w | ||
# usage: | ||
# [somebody@somewhere ~/gpxe/src]$ ./util/diffsize.pl [<old rev> [<new rev>]] | ||
# by default <old rev> is HEAD and <new rev> is the working tree | ||
|
||
use strict; | ||
|
||
-d "bin" or die "Please run me in the gPXE src directory\n"; | ||
mkdir ".sizes"; | ||
|
||
my($oldrev, $newrev); | ||
my($oldname, $newname); | ||
|
||
if (@ARGV) { | ||
$oldname = shift; | ||
} else { | ||
$oldname = "HEAD"; | ||
} | ||
|
||
if (@ARGV) { | ||
$newname = shift; | ||
} else { | ||
$newrev = "tree" . time(); | ||
} | ||
|
||
$oldrev = `git rev-parse $oldname`; | ||
chomp $oldrev; | ||
|
||
unless (defined $newrev) { | ||
$newrev = `git rev-parse $newname`; | ||
chomp $newrev; | ||
} | ||
|
||
sub calc_sizes($$) { | ||
my($name, $rev) = @_; | ||
my $output; | ||
my $lastrev; | ||
my $stashed = 0; | ||
my $res = 0; | ||
|
||
return if -e ".sizes/$rev.sizes"; | ||
|
||
if (defined $name) { | ||
$output = `git stash`; | ||
$stashed = 1 unless $output =~ /No local changes to save/; | ||
$lastrev = `git name-rev --name-only HEAD`; | ||
system("git checkout $name >/dev/null"); $res ||= $?; | ||
} | ||
|
||
system("make -j4 bin/gpxe.lkrn >/dev/null"); $res ||= $?; | ||
system("make bin/gpxe.lkrn.sizes > .sizes/$rev.sizes"); $res ||= $?; | ||
|
||
if (defined $name) { | ||
system("git checkout $lastrev >/dev/null"); $res ||= $?; | ||
system("git stash pop >/dev/null") if $stashed; $res ||= $?; | ||
} | ||
|
||
if ($res) { | ||
unlink(".sizes/$rev.sizes"); | ||
die "Error making sizes file\n"; | ||
} | ||
} | ||
|
||
our %Sizes; | ||
|
||
sub save_sizes($$) { | ||
my($id, $rev) = @_; | ||
my $file = ".sizes/$rev.sizes"; | ||
|
||
open SIZES, $file or die "opening $file: $!\n"; | ||
while (<SIZES>) { | ||
my($text, $data, $bss, $total, $hex, $name) = split; | ||
$name =~ s|bin/||; $name =~ s|\.o$||; | ||
|
||
# Skip the header and totals lines | ||
next if $total =~ /[a-z]/ or $name =~ /TOTALS/; | ||
|
||
# Skip files named with dash, due to old Makefile bug | ||
next if $name =~ /-/; | ||
|
||
$Sizes{$name} = {old => 0, new => 0} unless exists $Sizes{$name}; | ||
$Sizes{$name}{$id} = $total; | ||
} | ||
} | ||
|
||
calc_sizes($oldname, $oldrev); | ||
calc_sizes($newname, $newrev); | ||
|
||
save_sizes('old', $oldrev); | ||
save_sizes('new', $newrev); | ||
|
||
my $total = 0; | ||
|
||
for (sort keys %Sizes) { | ||
my $diff = $Sizes{$_}{new} - $Sizes{$_}{old}; | ||
if (abs($diff) >= 16) { | ||
printf "%12s %+d\n", substr($_, 0, 12), $Sizes{$_}{new} - $Sizes{$_}{old}; | ||
} | ||
$total += $diff; | ||
} | ||
printf " TOTAL: %+d\n", $total; |