aboutsummaryrefslogtreecommitdiff
path: root/scripts/singleuse.pl
blob: 0a5876a726d2be251ee44b7aa3e6dbf65b3594b4 (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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
#!/usr/bin/perl
#***************************************************************************
#                                  _   _ ____  _
#  Project                     ___| | | |  _ \| |
#                             / __| | | | |_) | |
#                            | (__| |_| |  _ <| |___
#                             \___|\___/|_| \_\_____|
#
# Copyright (C) 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.haxx.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
###########################################################################
#
# This script is aimed to help scan for and detect globally declared functions
# that are not used from other source files.
#
# Use it like this:
#
# $ ./scripts/singleuse.pl lib/.libs/libcurl.a
#
# Be aware that it might cause false positives due to various build options.
#

my $file = $ARGV[0];

my %wl = (
    'Curl_none_cert_status_request' => 'multiple TLS backends',
    'Curl_none_check_cxn' => 'multiple TLS backends',
    'Curl_none_cleanup' => 'multiple TLS backends',
    'Curl_none_close_all' => 'multiple TLS backends',
    'Curl_none_data_pending' => 'multiple TLS backends',
    'Curl_none_engines_list' => 'multiple TLS backends',
    'Curl_none_init' => 'multiple TLS backends',
    'Curl_none_md5sum' => 'multiple TLS backends',
    'Curl_none_random' => 'multiple TLS backends',
    'Curl_none_session_free' => 'multiple TLS backends',
    'Curl_none_set_engine' => 'multiple TLS backends',
    'Curl_none_set_engine_default' => 'multiple TLS backends',
    'Curl_none_shutdown' => 'multiple TLS backends',
    'Curl_multi_dump' => 'debug build only',
    'Curl_parse_port' => 'UNITTEST',
    'Curl_shuffle_addr' => 'UNITTEST',
    'de_cleanup' => 'UNITTEST',
    'doh_decode' => 'UNITTEST',
    'doh_encode' => 'UNITTEST',
    'Curl_auth_digest_get_pair' => 'by digest_sspi',
    'curlx_uztoso' => 'cmdline tool use',
    'curlx_uztoul' => 'by krb5_sspi',
    'curlx_uitous' => 'by schannel',
    'Curl_islower' => 'by curl_fnmatch',
    'getaddressinfo' => 'UNITTEST',
    );

my %api = (
    'curl_easy_cleanup' => 'API',
    'curl_easy_duphandle' => 'API',
    'curl_easy_escape' => 'API',
    'curl_easy_getinfo' => 'API',
    'curl_easy_init' => 'API',
    'curl_easy_pause' => 'API',
    'curl_easy_perform' => 'API',
    'curl_easy_recv' => 'API',
    'curl_easy_reset' => 'API',
    'curl_easy_send' => 'API',
    'curl_easy_setopt' => 'API',
    'curl_easy_strerror' => 'API',
    'curl_easy_unescape' => 'API',
    'curl_easy_upkeep' => 'API',
    'curl_escape' => 'API',
    'curl_formadd' => 'API',
    'curl_formfree' => 'API',
    'curl_formget' => 'API',
    'curl_free' => 'API',
    'curl_getdate' => 'API',
    'curl_getenv' => 'API',
    'curl_global_cleanup' => 'API',
    'curl_global_init' => 'API',
    'curl_global_init_mem' => 'API',
    'curl_global_sslset' => 'API',
    'curl_maprintf' => 'API',
    'curl_mfprintf' => 'API',
    'curl_mime_addpart' => 'API',
    'curl_mime_data' => 'API',
    'curl_mime_data_cb' => 'API',
    'curl_mime_encoder' => 'API',
    'curl_mime_filedata' => 'API',
    'curl_mime_filename' => 'API',
    'curl_mime_free' => 'API',
    'curl_mime_headers' => 'API',
    'curl_mime_init' => 'API',
    'curl_mime_name' => 'API',
    'curl_mime_subparts' => 'API',
    'curl_mime_type' => 'API',
    'curl_mprintf' => 'API',
    'curl_msnprintf' => 'API',
    'curl_msprintf' => 'API',
    'curl_multi_add_handle' => 'API',
    'curl_multi_assign' => 'API',
    'curl_multi_cleanup' => 'API',
    'curl_multi_fdset' => 'API',
    'curl_multi_info_read' => 'API',
    'curl_multi_init' => 'API',
    'curl_multi_perform' => 'API',
    'curl_multi_remove_handle' => 'API',
    'curl_multi_setopt' => 'API',
    'curl_multi_socket' => 'API',
    'curl_multi_socket_action' => 'API',
    'curl_multi_socket_all' => 'API',
    'curl_multi_strerror' => 'API',
    'curl_multi_timeout' => 'API',
    'curl_multi_wait' => 'API',
    'curl_mvaprintf' => 'API',
    'curl_mvfprintf' => 'API',
    'curl_mvprintf' => 'API',
    'curl_mvsnprintf' => 'API',
    'curl_mvsprintf' => 'API',
    'curl_pushheader_byname' => 'API',
    'curl_pushheader_bynum' => 'API',
    'curl_share_cleanup' => 'API',
    'curl_share_init' => 'API',
    'curl_share_setopt' => 'API',
    'curl_share_strerror' => 'API',
    'curl_slist_append' => 'API',
    'curl_slist_free_all' => 'API',
    'curl_strequal' => 'API',
    'curl_strnequal' => 'API',
    'curl_unescape' => 'API',
    'curl_url' => 'API',
    'curl_url_cleanup' => 'API',
    'curl_url_dup' => 'API',
    'curl_url_get' => 'API',
    'curl_url_set' => 'API',
    'curl_version' => 'API',
    'curl_version_info' => 'API',

    # the following functions are provided globally in debug builds
    'curl_easy_perform_ev' => 'debug-build',
    );

open(N, "nm $file|") ||
    die;

my %exist;
my %uses;
my $file;
while (<N>) {
    my $l = $_;
    chomp $l;

    if($l =~ /^([0-9a-z_-]+)\.o:/) {
        $file = $1;
    }
    if($l =~ /^([0-9a-f]+) T (.*)/) {
        my ($name)=($2);
        #print "Define $name in $file\n";
        $file =~ s/^libcurl_la-//;
        $exist{$name} = $file;
    }
    elsif($l =~ /^                 U (.*)/) {
        my ($name)=($1);
        #print "Uses $name in $file\n";
        $uses{$name} .= "$file, ";
    }
}
close(N);

my $err;
for(sort keys %exist) {
    #printf "%s is defined in %s, used by: %s\n", $_, $exist{$_}, $uses{$_};
    if(!$uses{$_}) {
        # this is a symbol with no "global" user
        if($_ =~ /^curl_/) {
            if(!$api{$_}) {
                # not present in the API, or for debug-builds
                print STDERR "Bad curl-prefix: $_\n";
                $err++;
            }
        }
        elsif($_ =~ /^curl_dbg_/) {
            # we ignore the memdebug symbols
        }
        elsif($wl{$_}) {
            #print "$_ is WL\n";
        }
        else {
            printf "%s is defined in %s, but not used outside\n", $_, $exist{$_};
            $err++;
        }
    }
    elsif($_ =~ /^curl_/) {
        # global prefix, make sure it is "blessed"
        if(!$api{$_}) {
            # not present in the API, or for debug-builds
            print STDERR "Bad curl-prefix $_\n";
            $err++;
        }
    }
}

exit $err;