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Commit | Line | Data |
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bb286d71 AO |
1 | #! /bin/sh |
2 | ||
3 | # Compare stripped copies of two given object files. | |
4 | ||
1dedc12d | 5 | # Copyright (C) 2007, 2008, 2009, 2010, 2012, 2020 Free Software Foundation |
bb286d71 AO |
6 | # Originally by Alexandre Oliva <aoliva@redhat.com> |
7 | ||
8 | # This file is part of GCC. | |
9 | ||
10 | # GCC is free software; you can redistribute it and/or modify it under | |
11 | # the terms of the GNU General Public License as published by the Free | |
12 | # Software Foundation; either version 3, or (at your option) any later | |
13 | # version. | |
14 | ||
15 | # GCC is distributed in the hope that it will be useful, but WITHOUT | |
16 | # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
17 | # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
18 | # License for more details. | |
19 | ||
20 | # You should have received a copy of the GNU General Public License | |
21 | # along with GCC; see the file COPYING3. If not see | |
22 | # <http://www.gnu.org/licenses/>. | |
23 | ||
3a3b6beb AO |
24 | rm='rm -f' |
25 | ||
26 | case $1 in | |
27 | -p | --preserve) | |
28 | rm='echo preserving' | |
29 | shift | |
30 | ;; | |
31 | esac | |
32 | ||
bb286d71 AO |
33 | if test $# != 2; then |
34 | echo 'usage: compare-debug file1.o file2.o' >&2 | |
35 | exit 1 | |
36 | fi | |
37 | ||
38 | if test ! -f "$1"; then | |
39 | echo "$1" does not exist >&2 | |
40 | exit 1 | |
41 | fi | |
42 | ||
43 | if test ! -f "$2"; then | |
44 | echo "$2" does not exist >&2 | |
45 | exit 1 | |
46 | fi | |
47 | ||
a64036a7 AO |
48 | suf1=stripped |
49 | while test -f "$1.$suf1"; do | |
50 | suf1=$suf1. | |
51 | done | |
bb286d71 | 52 | |
a64036a7 AO |
53 | suf2=stripped |
54 | while test -f "$2.$suf2"; do | |
55 | suf2=$suf2. | |
56 | done | |
bb286d71 | 57 | |
a64036a7 | 58 | trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15 |
bb286d71 | 59 | |
bb59df52 IS |
60 | case `uname -s` in |
61 | Darwin) | |
9a082684 IS |
62 | # The strip command on darwin does not remove all debug info. |
63 | # Fortunately, we can use ld to do it instead. | |
64 | ld -S -r -no_uuid "$1" -o "$1.$suf1" | |
65 | ld -S -r -no_uuid "$2" -o "$2.$suf2" | |
bb59df52 IS |
66 | ;; |
67 | *) | |
68 | cp "$1" "$1.$suf1" | |
69 | strip "$1.$suf1" | |
bb286d71 | 70 | |
bb59df52 IS |
71 | cp "$2" "$2.$suf2" |
72 | strip "$2.$suf2" | |
73 | ;; | |
74 | esac | |
bb286d71 | 75 | |
c7046906 L |
76 | remove_comment () |
77 | { | |
78 | file=$1 | |
79 | opts= | |
80 | for s in `objdump --section-headers "$file" | awk '{ print $2 }'`; do | |
81 | case "$s" in | |
82 | .comment*) | |
83 | opts="$opts --remove-section $s" | |
84 | ;; | |
85 | esac | |
86 | done | |
87 | [ -n "$opts" ] && objcopy $opts $file | |
88 | } | |
89 | ||
a64036a7 | 90 | if cmp "$1.$suf1" "$2.$suf2"; then |
bb286d71 AO |
91 | status=0 |
92 | else | |
93 | status=1 | |
2feb56e6 | 94 | |
c7046906 L |
95 | # Remove any .comment sections. |
96 | if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null \ | |
97 | && (objdump --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then | |
98 | remove_comment "$1.$suf1" | |
99 | remove_comment "$2.$suf2" | |
100 | if cmp "$1.$suf1" "$2.$suf2"; then | |
101 | status=0 | |
102 | fi | |
103 | fi | |
104 | ||
2feb56e6 AO |
105 | # Assembler-generated CFI will add an .eh_frame section for -g not |
106 | # present in -g0. Try to cope with it by checking that an .eh_frame | |
107 | # section is present in either object file, and then stripping it | |
108 | # off before re-comparing. | |
109 | ||
110 | cmd= | |
111 | cmp1= | |
112 | cmp2= | |
113 | ||
114 | for t in objdump readelf eu-readelf; do | |
c45ae2c8 | 115 | if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then |
2feb56e6 AO |
116 | cmd=$t |
117 | ||
118 | $cmd --section-headers "$1.$suf1" | grep '\.eh_frame' > /dev/null | |
119 | cmp1=$? | |
120 | ||
121 | $cmd --section-headers "$2.$suf2" | grep '\.eh_frame' > /dev/null | |
122 | cmp2=$? | |
123 | ||
124 | break | |
125 | fi | |
126 | done | |
127 | ||
128 | # If we found .eh_frame in one but not the other, or if we could not | |
339325b3 AO |
129 | # find a command to tell, or if there are LTO sections, try to strip |
130 | # off the .eh_frame and LTO sections from both. | |
131 | if test "x$cmp1" != "x$cmp2" || test "x$cmd" = "x" || | |
132 | $cmd --section-headers "$1.$suf1" | grep '.gnu.lto_' > /dev/null || | |
133 | $cmd --section-headers "$2.$suf2" | grep '.gnu.lto_' > /dev/null ; then | |
2feb56e6 AO |
134 | suf3=$suf1. |
135 | while test -f "$1.$suf3"; do | |
136 | suf3=$suf3. | |
137 | done | |
138 | ||
139 | suf4=$suf2. | |
140 | while test -f "$2.$suf4"; do | |
141 | suf4=$suf4. | |
142 | done | |
143 | ||
144 | trap 'rm -f "$1.$suf1" "$2.$suf2" "$1.$suf3" "$2.$suf4"' 0 1 2 15 | |
145 | ||
339325b3 AO |
146 | echo stripping off .eh_frame and LTO sections, then retrying >&2 |
147 | ||
148 | seclist=".eh_frame .rel.eh_frame .rela.eh_frame" | |
149 | if test "x$cmd" != "x"; then | |
150 | seclist="$seclist "`{ $cmd --section-headers "$1.$suf1"; $cmd --section-headers "$2.$suf2"; } | sed -n 's,.* \(\.gnu\.lto_[^ ]*\).*,\1,p' | sort -u` | |
151 | fi | |
152 | rsopts=`for sec in $seclist; do echo " --remove-section $sec"; done` | |
2feb56e6 | 153 | |
c45ae2c8 | 154 | if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then |
339325b3 | 155 | objcopy $rsopts "$1.$suf1" "$1.$suf3" |
2feb56e6 | 156 | mv "$1.$suf3" "$1.$suf1" |
5830150a | 157 | |
339325b3 | 158 | objcopy $rsopts "$2.$suf2" "$2.$suf4" |
2feb56e6 | 159 | mv "$2.$suf4" "$2.$suf2" |
c45ae2c8 | 160 | elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then |
2feb56e6 | 161 | cp "$1.$suf1" "$1.$suf3" |
339325b3 | 162 | strip $rsopts "$1.$suf3" |
5830150a | 163 | mv "$1.$suf3" "$1.$suf1" |
2feb56e6 AO |
164 | |
165 | cp "$2.$suf2" "$2.$suf4" | |
339325b3 | 166 | strip $rsopts "$2.$suf4" |
2feb56e6 | 167 | mv "$2.$suf4" "$2.$suf2" |
5830150a AO |
168 | else |
169 | echo failed to strip off .eh_frame >&2 | |
2feb56e6 AO |
170 | fi |
171 | ||
172 | trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15 | |
2feb56e6 | 173 | |
5830150a AO |
174 | if cmp "$1.$suf1" "$2.$suf2"; then |
175 | status=0 | |
176 | else | |
177 | status=1 | |
178 | fi | |
2feb56e6 | 179 | fi |
bb286d71 AO |
180 | fi |
181 | ||
3a3b6beb | 182 | $rm "$1.$suf1" "$2.$suf2" |
bb286d71 AO |
183 | |
184 | trap "exit $status; exit" 0 1 2 15 | |
185 | ||
1dedc12d AO |
186 | # Replace the suffix in $1 and $2 with .*.gkd, compare them if a |
187 | # single file is found by the globbing. | |
188 | base1=`echo "$1" | sed '$s,\.[^.]*$,,'` gkd1= | |
189 | for f in "$base1".*.gkd; do | |
190 | if test "x$gkd1" != x; then | |
191 | gkd1= | |
192 | break | |
193 | elif test -f "$f"; then | |
194 | gkd1=$f | |
195 | fi | |
196 | done | |
197 | base2=`echo "$2" | sed '$s,\.[^.]*$,,'` gkd2= | |
198 | for f in "$base2".*.gkd; do | |
199 | if test "x$gkd2" != x; then | |
200 | gkd2= | |
201 | break | |
202 | elif test -f "$f"; then | |
203 | gkd2=$f | |
204 | fi | |
205 | done | |
206 | if test "x$gkd1" != x || test "x$gkd2" != x; then | |
207 | if cmp "${gkd1-/dev/null}" "${gkd2-/dev/null}"; then | |
b5b8b0ac AO |
208 | : |
209 | else | |
210 | status=$? | |
211 | fi | |
212 | fi | |
213 | ||
bb286d71 | 214 | exit $status |