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git version 2c4ca6832fa6b306ee6a7010bfb80a3f2596f824
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 11:07:02 +0900
parents 95c75e76d11b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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1 #!/usr/bin/perl
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2
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3 use Getopt::Std;
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4 $DEBUG = 0;
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5
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6 sub parse_objdump_file {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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7 my ($filename) = @_;
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8 my @result;
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9 open (INPUT, $filename) or die "$filename: $!\n";
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10 print "opened objdump output file $filename\n" if $DEBUG;
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11 while (<INPUT>) {
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12 if (/\s*([0-9a-f]*):\t(([0-9a-f]{2} )+) *\t(.*)$/) {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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13 my ($addr, $bytes, $instr) = ($1, $2, $4);
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14 $addr = "0x" . $addr;
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15 $bytes =~ s/\s*(.*\S)\s*/$1/; # trim any remaining whitespace
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16 $instr =~ s/\s*(.*\S)\s*/$1/;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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17 push (@result, {'addr' => $addr, 'bytes' => $bytes, 'instr' => $instr});
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18 print "addr=$addr bytes='$bytes' instr='$instr'\n" if $DEBUG;
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19 }
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20 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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21 close INPUT;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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22 return @result;
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23 }
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24
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25 sub parse_gdb_file {
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26 my ($filename) = @_;
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27 my @result;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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28 my $got_addr;
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29 open (INPUT, $filename) or die "$filename: $!\n";
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30 print "opened gdb output file $filename\n" if $DEBUG;
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31 while (<INPUT>) {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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32 if (/^(0x[0-9a-f]*):\t([^\t]*)\t[^:]*:\t((0x[0-9a-f]{2}\s*)+)\s*$/) {
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33 my ($addr, $bytes, $instr) = ($1, $3, $2);
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34 $bytes =~ s/0x//g;
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35 $bytes =~ s/\s+/ /g; # regularize whitespace
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36 $bytes =~ s/\s*(.*\S)\s*/$1/; # trim any remaining whitespace
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37 $instr =~ s/\s*(.*\S)\s*/$1/;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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38 push (@result, {'addr' => $addr, 'bytes' => $bytes, 'instr' => $instr});
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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39 print "addr=$addr bytes='$bytes' instr='$instr'\n" if $DEBUG;
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40 } elsif (/^(0x[0-9a-f]*):\t$/) { # deal with gdb's line breaker
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41 $got_addr = $1;
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42 } elsif ($got_addr && /^ ([^\t]*)\t[^:]*:\t((0x[0-9a-f]{2}\s*)+)\s*$/) {
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43 my ($addr, $bytes, $instr) = ($got_addr, $2, $1);
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44 $bytes =~ s/0x//g;
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45 $bytes =~ s/\s+/ /g; # regularize whitespace
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46 $bytes =~ s/\s*(.*\S)\s*/$1/; # trim any remaining whitespace
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47 $instr =~ s/\s*(.*\S)\s*/$1/;
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48 push (@result, {'addr' => $addr, 'bytes' => $bytes, 'instr' => $instr});
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49 print "addr=$addr bytes='$bytes' instr='$instr'\n" if $DEBUG;
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50 undef $got_addr;
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51 }
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52 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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53 close INPUT;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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54 return @result;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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55 }
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56
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57 sub binary_diffs {
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58 my ($objdump_file, $gdb_file) = @_;
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59 my @file1 = parse_objdump_file ($objdump_file);
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60 my @file2 = parse_gdb_file ($gdb_file);
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61 my $lastrecord = ($#file1 >= $#file2) ? ($#file1) : ($#file2);
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62 for (my $i = 0; $i <= $lastrecord; ++$i) {
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63 my $d1 = $file1[$i];
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64 my $d2 = $file2[$i];
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65 if ($d1->{'bytes'} ne $d2->{'bytes'}) {
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66 next if (($d1->{'instr'} eq $d2->{'instr'}) && $opt_d);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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67 printf "0x%08x:\t%30s \t%s\n", 0+$d1->{'addr'}, $d1->{'bytes'}, $d1->{'instr'};
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68 printf "0x%08x:\t%30s \t%s\n\n", 0+$d2->{'addr'}, $d2->{'bytes'}, $d2->{'instr'};
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69 }
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70 }
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71 }
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72
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73 &getopts('d');
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74 $objdump_file = $ARGV[0];
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75 $gdb_file = $ARGV[1];
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76 binary_diffs ($objdump_file, $gdb_file);
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77 exit (0);
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78 __END__
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79 =pod
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80
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81 =head1 NAME
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82
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83 codegen-diff
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84
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85 =head1 SYNOPSIS
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86
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87 codegen-diff [-d] I<OBJDUMP-OUTPUT-FILE> I<GDB-DISASSEMBLY-FILE>
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88
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89 =head1 DESCRIPTION
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90
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91 B<codegen-diff> is a program that tries to show you the differences
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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92 between the code that B<llc> generated and the code that B<lli> generated.
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93
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94 The way you use it is as follows: first, you create I<OBJDUMP-OUTPUT-FILE>
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95 by running B<objdump> on the B<llc> compiled and linked binary. You need to
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96 trim down the result so it contains only the function of interest.
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97
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98 Second, you create I<GDB-DISASSEMBLY-FILE> by running B<gdb>, with my patch
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parents:
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99 to print out hex bytes in the B<disassemble> command output, on
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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100 B<lli>. Set a breakpoint in C<Emitter::finishFunction()> and wait until
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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101 the function you want is compiled. Then use the B<disassemble> command
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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102 to print out the assembly dump of the function B<lli> just compiled.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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103 (Use C<lli -debug> to find out where the function starts and ends in memory.)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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104 It's easiest to save this output by using B<script>.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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105
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106 Finally, you run B<codegen-diff>, as indicated in the Synopsis section of
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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107 this manpage. It will print out a two-line stanza for each mismatched
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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108 instruction, with the B<llc> version first, and the B<lli> version second.
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parents:
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109
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110 =head1 OPTIONS
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parents:
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111
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112 =over 4
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113
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114 =item -d
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115
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116 Don't show instructions where the bytes are different but they
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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117 disassemble to the same thing. This puts a lot of trust in the
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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118 disassembler, but it might help you highlight the more egregious cases
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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119 of misassembly.
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120
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121 =back
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122
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123 =head1 AUTHOR
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124
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125 B<codegen-diff> was written by Brian Gaeke.
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126
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127 =head1 SEE ALSO
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128
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129 L<gdb(1)>, L<objdump(1)>, L<script(1)>.
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130
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131 You will need my B<gdb> patch:
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132
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133 http://llvm.cs.uiuc.edu/~gaeke/gdb-disassembly-print-bytes.patch
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134
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135 =cut