aboutsummaryrefslogtreecommitdiff
path: root/contrib/compare-debug
blob: 98c80f93e98d05b3a275bc5d5a9b4a1e3794aaca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
#! /bin/sh

# Compare stripped copies of two given object files.

# Copyright (C) 2007, 2008, 2009 Free Software Foundation
# Originally by Alexandre Oliva <aoliva@redhat.com>

# This file is part of GCC.

# GCC is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 3, or (at your option) any later
# version.

# GCC is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
# License for more details.

# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.

rm='rm -f'

case $1 in
-p | --preserve)
  rm='echo preserving'
  shift
  ;;
esac

if test $# != 2; then
  echo 'usage: compare-debug file1.o file2.o' >&2
  exit 1
fi

if test ! -f "$1"; then
  echo "$1" does not exist >&2
  exit 1
fi

if test ! -f "$2"; then
  echo "$2" does not exist >&2
  exit 1
fi

suf1=stripped
while test -f "$1.$suf1"; do
  suf1=$suf1.
done

suf2=stripped
while test -f "$2.$suf2"; do
  suf2=$suf2.
done

trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15

case `uname -s` in
Darwin)
  ld -S -x -r -no_uuid "$1" -o "$1.$suf1"
  ld -S -x -r -no_uuid "$2" -o "$2.$suf2"
  ;;
*)
  cp "$1" "$1.$suf1"
  strip "$1.$suf1"

  cp "$2" "$2.$suf2"
  strip "$2.$suf2"
  ;;
esac

if cmp "$1.$suf1" "$2.$suf2"; then
  status=0
else
  status=1

  # Assembler-generated CFI will add an .eh_frame section for -g not
  # present in -g0.  Try to cope with it by checking that an .eh_frame
  # section is present in either object file, and then stripping it
  # off before re-comparing.

  cmd=
  cmp1=
  cmp2=

  for t in objdump readelf eu-readelf; do
    if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then
      cmd=$t

      $cmd --section-headers "$1.$suf1" | grep '\.eh_frame' > /dev/null
      cmp1=$?

      $cmd --section-headers "$2.$suf2" | grep '\.eh_frame' > /dev/null
      cmp2=$?

      break
    fi
  done

  # If we found .eh_frame in one but not the other, or if we could not
  # find a command to tell, try to strip off the .eh_frame section
  # from both.
  if test "x$cmp1" != "x$cmp2" || test "x$cmd" = "x"; then
    suf3=$suf1.
    while test -f "$1.$suf3"; do
      suf3=$suf3.
    done

    suf4=$suf2.
    while test -f "$2.$suf4"; do
      suf4=$suf4.
    done

    trap 'rm -f "$1.$suf1" "$2.$suf2" "$1.$suf3" "$2.$suf4"' 0 1 2 15

    echo stripping off .eh_frame, then retrying >&2

    if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then
      objcopy --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$1.$suf1" "$1.$suf3"
      mv "$1.$suf3" "$1.$suf1"

      objcopy --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$2.$suf2" "$2.$suf4"
      mv "$2.$suf4" "$2.$suf2"
    elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then
      cp "$1.$suf1" "$1.$suf3"
      strip --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$1.$suf3"
      mv "$1.$suf3" "$1.$suf1"

      cp "$2.$suf2" "$2.$suf4"
      strip --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$2.$suf4"
      mv "$2.$suf4" "$2.$suf2"
    else
      echo failed to strip off .eh_frame >&2
    fi

    trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15

    if cmp "$1.$suf1" "$2.$suf2"; then
      status=0
    else
      status=1
    fi
  fi
fi

$rm "$1.$suf1" "$2.$suf2"

trap "exit $status; exit" 0 1 2 15

if test -f "$1".gkd || test -f "$2".gkd; then
  if cmp "$1".gkd "$2".gkd; then
    :
  else
    status=$?
  fi
fi

exit $status