diff options
Diffstat (limited to 'contrib/llvm/utils/codegen-diff')
-rwxr-xr-x | contrib/llvm/utils/codegen-diff | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/contrib/llvm/utils/codegen-diff b/contrib/llvm/utils/codegen-diff deleted file mode 100755 index 2c3ac4c..0000000 --- a/contrib/llvm/utils/codegen-diff +++ /dev/null @@ -1,135 +0,0 @@ -#!/usr/bin/perl - -use Getopt::Std; -$DEBUG = 0; - -sub parse_objdump_file { - my ($filename) = @_; - my @result; - open (INPUT, $filename) or die "$filename: $!\n"; - print "opened objdump output file $filename\n" if $DEBUG; - while (<INPUT>) { - if (/\s*([0-9a-f]*):\t(([0-9a-f]{2} )+) *\t(.*)$/) { - my ($addr, $bytes, $instr) = ($1, $2, $4); - $addr = "0x" . $addr; - $bytes =~ s/\s*(.*\S)\s*/$1/; # trim any remaining whitespace - $instr =~ s/\s*(.*\S)\s*/$1/; - push (@result, {'addr' => $addr, 'bytes' => $bytes, 'instr' => $instr}); - print "addr=$addr bytes='$bytes' instr='$instr'\n" if $DEBUG; - } - } - close INPUT; - return @result; -} - -sub parse_gdb_file { - my ($filename) = @_; - my @result; - my $got_addr; - open (INPUT, $filename) or die "$filename: $!\n"; - print "opened gdb output file $filename\n" if $DEBUG; - while (<INPUT>) { - if (/^(0x[0-9a-f]*):\t([^\t]*)\t[^:]*:\t((0x[0-9a-f]{2}\s*)+)\s*$/) { - my ($addr, $bytes, $instr) = ($1, $3, $2); - $bytes =~ s/0x//g; - $bytes =~ s/\s+/ /g; # regularize whitespace - $bytes =~ s/\s*(.*\S)\s*/$1/; # trim any remaining whitespace - $instr =~ s/\s*(.*\S)\s*/$1/; - push (@result, {'addr' => $addr, 'bytes' => $bytes, 'instr' => $instr}); - print "addr=$addr bytes='$bytes' instr='$instr'\n" if $DEBUG; - } elsif (/^(0x[0-9a-f]*):\t$/) { # deal with gdb's line breaker - $got_addr = $1; - } elsif ($got_addr && /^ ([^\t]*)\t[^:]*:\t((0x[0-9a-f]{2}\s*)+)\s*$/) { - my ($addr, $bytes, $instr) = ($got_addr, $2, $1); - $bytes =~ s/0x//g; - $bytes =~ s/\s+/ /g; # regularize whitespace - $bytes =~ s/\s*(.*\S)\s*/$1/; # trim any remaining whitespace - $instr =~ s/\s*(.*\S)\s*/$1/; - push (@result, {'addr' => $addr, 'bytes' => $bytes, 'instr' => $instr}); - print "addr=$addr bytes='$bytes' instr='$instr'\n" if $DEBUG; - undef $got_addr; - } - } - close INPUT; - return @result; -} - -sub binary_diffs { - my ($objdump_file, $gdb_file) = @_; - my @file1 = parse_objdump_file ($objdump_file); - my @file2 = parse_gdb_file ($gdb_file); - my $lastrecord = ($#file1 >= $#file2) ? ($#file1) : ($#file2); - for (my $i = 0; $i <= $lastrecord; ++$i) { - my $d1 = $file1[$i]; - my $d2 = $file2[$i]; - if ($d1->{'bytes'} ne $d2->{'bytes'}) { - next if (($d1->{'instr'} eq $d2->{'instr'}) && $opt_d); - printf "0x%08x:\t%30s \t%s\n", 0+$d1->{'addr'}, $d1->{'bytes'}, $d1->{'instr'}; - printf "0x%08x:\t%30s \t%s\n\n", 0+$d2->{'addr'}, $d2->{'bytes'}, $d2->{'instr'}; - } - } -} - -&getopts('d'); -$objdump_file = $ARGV[0]; -$gdb_file = $ARGV[1]; -binary_diffs ($objdump_file, $gdb_file); -exit (0); -__END__ -=pod - -=head1 NAME - -codegen-diff - -=head1 SYNOPSIS - -codegen-diff [-d] I<OBJDUMP-OUTPUT-FILE> I<GDB-DISASSEMBLY-FILE> - -=head1 DESCRIPTION - -B<codegen-diff> is a program that tries to show you the differences -between the code that B<llc> generated and the code that B<lli> generated. - -The way you use it is as follows: first, you create I<OBJDUMP-OUTPUT-FILE> -by running B<objdump> on the B<llc> compiled and linked binary. You need to -trim down the result so it contains only the function of interest. - -Second, you create I<GDB-DISASSEMBLY-FILE> by running B<gdb>, with my patch -to print out hex bytes in the B<disassemble> command output, on -B<lli>. Set a breakpoint in C<Emitter::finishFunction()> and wait until -the function you want is compiled. Then use the B<disassemble> command -to print out the assembly dump of the function B<lli> just compiled. -(Use C<lli -debug> to find out where the function starts and ends in memory.) -It's easiest to save this output by using B<script>. - -Finally, you run B<codegen-diff>, as indicated in the Synopsis section of -this manpage. It will print out a two-line stanza for each mismatched -instruction, with the B<llc> version first, and the B<lli> version second. - -=head1 OPTIONS - -=over 4 - -=item -d - -Don't show instructions where the bytes are different but they -disassemble to the same thing. This puts a lot of trust in the -disassembler, but it might help you highlight the more egregious cases -of misassembly. - -=back - -=head1 AUTHOR - -B<codegen-diff> was written by Brian Gaeke. - -=head1 SEE ALSO - -L<gdb(1)>, L<objdump(1)>, L<script(1)>. - -You will need my B<gdb> patch: - - http://llvm.cs.uiuc.edu/~gaeke/gdb-disassembly-print-bytes.patch - -=cut |