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bf6d8037 | 1 | /* libdeps plugin for the GNU linker. |
a2c58332 | 2 | Copyright (C) 2020-2022 Free Software Foundation, Inc. |
bf6d8037 HC |
3 | |
4 | This file is part of the GNU Binutils. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | #include "sysdep.h" | |
22 | #include "bfd.h" | |
23 | #if BFD_SUPPORTS_PLUGINS | |
24 | #include "plugin-api.h" | |
25 | ||
26 | #include <ctype.h> /* For isspace. */ | |
27 | ||
28 | extern enum ld_plugin_status onload (struct ld_plugin_tv *tv); | |
29 | ||
30 | /* Helper for calling plugin api message function. */ | |
31 | #define TV_MESSAGE if (tv_message) (*tv_message) | |
32 | ||
33 | /* Function pointers to cache hooks passed at onload time. */ | |
34 | static ld_plugin_register_claim_file tv_register_claim_file = 0; | |
35 | static ld_plugin_register_all_symbols_read tv_register_all_symbols_read = 0; | |
36 | static ld_plugin_register_cleanup tv_register_cleanup = 0; | |
37 | static ld_plugin_message tv_message = 0; | |
38 | static ld_plugin_add_input_library tv_add_input_library = 0; | |
39 | static ld_plugin_set_extra_library_path tv_set_extra_library_path = 0; | |
40 | ||
41 | /* Handle/record information received in a transfer vector entry. */ | |
42 | static enum ld_plugin_status | |
43 | parse_tv_tag (struct ld_plugin_tv *tv) | |
44 | { | |
45 | #define SETVAR(x) x = tv->tv_u.x | |
46 | switch (tv->tv_tag) | |
47 | { | |
48 | case LDPT_REGISTER_CLAIM_FILE_HOOK: | |
49 | SETVAR(tv_register_claim_file); | |
50 | break; | |
51 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: | |
52 | SETVAR(tv_register_all_symbols_read); | |
53 | break; | |
54 | case LDPT_REGISTER_CLEANUP_HOOK: | |
55 | SETVAR(tv_register_cleanup); | |
56 | break; | |
57 | case LDPT_MESSAGE: | |
58 | SETVAR(tv_message); | |
59 | break; | |
60 | case LDPT_ADD_INPUT_LIBRARY: | |
61 | SETVAR(tv_add_input_library); | |
62 | break; | |
63 | case LDPT_SET_EXTRA_LIBRARY_PATH: | |
64 | SETVAR(tv_set_extra_library_path); | |
65 | break; | |
66 | default: | |
67 | break; | |
68 | } | |
69 | #undef SETVAR | |
70 | return LDPS_OK; | |
71 | } | |
72 | ||
73 | /* Defs for archive parsing. */ | |
74 | #define ARMAGSIZE 8 | |
75 | typedef struct arhdr | |
76 | { | |
77 | char ar_name[16]; | |
78 | char ar_date[12]; | |
79 | char ar_uid[6]; | |
80 | char ar_gid[6]; | |
81 | char ar_mode[8]; | |
82 | char ar_size[10]; | |
83 | char ar_fmag[2]; | |
84 | } arhdr; | |
85 | ||
86 | typedef struct linerec | |
87 | { | |
88 | struct linerec *next; | |
89 | char line[]; | |
90 | } linerec; | |
91 | ||
92 | #define LIBDEPS "__.LIBDEP/ " | |
93 | ||
94 | static linerec *line_head, **line_tail = &line_head; | |
95 | ||
96 | static enum ld_plugin_status | |
97 | get_libdeps (int fd) | |
98 | { | |
99 | arhdr ah; | |
100 | int len; | |
101 | unsigned long mlen; | |
46465574 | 102 | size_t amt; |
bf6d8037 HC |
103 | linerec *lr; |
104 | enum ld_plugin_status rc = LDPS_NO_SYMS; | |
105 | ||
106 | lseek (fd, ARMAGSIZE, SEEK_SET); | |
107 | for (;;) | |
108 | { | |
109 | len = read (fd, (void *) &ah, sizeof (ah)); | |
110 | if (len != sizeof (ah)) | |
111 | break; | |
112 | mlen = strtoul (ah.ar_size, NULL, 10); | |
113 | if (!mlen || strncmp (ah.ar_name, LIBDEPS, sizeof (LIBDEPS)-1)) | |
114 | { | |
115 | lseek (fd, mlen, SEEK_CUR); | |
116 | continue; | |
117 | } | |
46465574 NC |
118 | amt = mlen + sizeof (linerec); |
119 | if (amt <= mlen) | |
120 | return LDPS_ERR; | |
121 | lr = malloc (amt); | |
bf6d8037 HC |
122 | if (!lr) |
123 | return LDPS_ERR; | |
124 | lr->next = NULL; | |
125 | len = read (fd, lr->line, mlen); | |
126 | lr->line[mlen-1] = '\0'; | |
127 | *line_tail = lr; | |
128 | line_tail = &lr->next; | |
129 | rc = LDPS_OK; | |
130 | break; | |
131 | } | |
132 | return rc; | |
133 | } | |
134 | ||
135 | /* Turn a string into an argvec. */ | |
136 | static char ** | |
137 | str2vec (char *in) | |
138 | { | |
139 | char **res; | |
140 | char *s, *first, *end; | |
141 | char *sq, *dq; | |
142 | int i; | |
143 | ||
144 | end = in + strlen (in); | |
145 | s = in; | |
1cfc6f00 | 146 | while (isspace ((unsigned char) *s)) s++; |
bf6d8037 HC |
147 | first = s; |
148 | ||
149 | i = 1; | |
150 | while ((s = strchr (s, ' '))) | |
151 | { | |
152 | s++; | |
153 | i++; | |
154 | } | |
155 | res = (char **)malloc ((i+1) * sizeof (char *)); | |
156 | if (!res) | |
157 | return res; | |
158 | ||
159 | i = 0; | |
160 | sq = NULL; | |
161 | dq = NULL; | |
162 | res[0] = first; | |
163 | for (s = first; *s; s++) | |
164 | { | |
165 | if (*s == '\\') | |
166 | { | |
167 | memmove (s, s+1, end-s-1); | |
168 | end--; | |
169 | } | |
1cfc6f00 | 170 | if (isspace ((unsigned char) *s)) |
bf6d8037 HC |
171 | { |
172 | if (sq || dq) | |
173 | continue; | |
174 | *s++ = '\0'; | |
1cfc6f00 | 175 | while (isspace ((unsigned char) *s)) s++; |
bf6d8037 HC |
176 | if (*s) |
177 | res[++i] = s; | |
178 | } | |
179 | if (*s == '\'' && !dq) | |
180 | { | |
181 | if (sq) | |
182 | { | |
183 | memmove (sq, sq+1, s-sq-1); | |
184 | memmove (s-2, s+1, end-s-1); | |
185 | end -= 2; | |
186 | s--; | |
187 | sq = NULL; | |
188 | } | |
189 | else | |
190 | { | |
191 | sq = s; | |
192 | } | |
193 | } | |
194 | if (*s == '"' && !sq) | |
195 | { | |
196 | if (dq) | |
197 | { | |
198 | memmove (dq, dq+1, s-dq-1); | |
199 | memmove (s-2, s+1, end-s-1); | |
200 | end -= 2; | |
201 | s--; | |
202 | dq = NULL; | |
203 | } | |
204 | else | |
205 | { | |
206 | dq = s; | |
207 | } | |
208 | } | |
209 | } | |
210 | res[++i] = NULL; | |
211 | return res; | |
212 | } | |
213 | ||
214 | static char *prevfile; | |
215 | ||
216 | /* Standard plugin API registerable hook. */ | |
217 | static enum ld_plugin_status | |
218 | onclaim_file (const struct ld_plugin_input_file *file, int *claimed) | |
219 | { | |
220 | enum ld_plugin_status rv; | |
221 | ||
222 | *claimed = 0; | |
223 | ||
224 | /* If we've already seen this file, ignore it. */ | |
225 | if (prevfile && !strcmp (file->name, prevfile)) | |
226 | return LDPS_OK; | |
227 | ||
228 | /* If it's not an archive member, ignore it. */ | |
229 | if (!file->offset) | |
230 | return LDPS_OK; | |
231 | ||
232 | if (prevfile) | |
233 | free (prevfile); | |
234 | ||
235 | prevfile = strdup (file->name); | |
236 | if (!prevfile) | |
237 | return LDPS_ERR; | |
238 | ||
239 | /* This hook only gets called on actual object files. | |
240 | * We have to examine the archive ourselves, to find | |
241 | * our LIBDEPS member. */ | |
242 | rv = get_libdeps (file->fd); | |
243 | if (rv == LDPS_ERR) | |
244 | return rv; | |
245 | ||
246 | if (rv == LDPS_OK) | |
247 | { | |
248 | linerec *lr = (linerec *)line_tail; | |
249 | /* Inform the user/testsuite. */ | |
250 | TV_MESSAGE (LDPL_INFO, "got deps for library %s: %s", | |
251 | file->name, lr->line); | |
252 | fflush (NULL); | |
253 | } | |
254 | ||
255 | return LDPS_OK; | |
256 | } | |
257 | ||
258 | /* Standard plugin API registerable hook. */ | |
259 | static enum ld_plugin_status | |
260 | onall_symbols_read (void) | |
261 | { | |
262 | linerec *lr; | |
263 | char **vec; | |
264 | enum ld_plugin_status rv = LDPS_OK; | |
265 | ||
266 | while ((lr = line_head)) | |
267 | { | |
268 | line_head = lr->next; | |
269 | vec = str2vec (lr->line); | |
270 | if (vec) | |
271 | { | |
272 | int i; | |
273 | for (i = 0; vec[i]; i++) | |
274 | { | |
275 | if (vec[i][0] != '-') | |
276 | { | |
277 | TV_MESSAGE (LDPL_WARNING, "ignoring libdep argument %s", | |
278 | vec[i]); | |
279 | fflush (NULL); | |
280 | continue; | |
281 | } | |
282 | if (vec[i][1] == 'l') | |
283 | rv = tv_add_input_library (vec[i]+2); | |
284 | else if (vec[i][1] == 'L') | |
285 | rv = tv_set_extra_library_path (vec[i]+2); | |
286 | else | |
287 | { | |
288 | TV_MESSAGE (LDPL_WARNING, "ignoring libdep argument %s", | |
289 | vec[i]); | |
290 | fflush (NULL); | |
291 | } | |
292 | if (rv != LDPS_OK) | |
293 | break; | |
294 | } | |
295 | free (vec); | |
296 | } | |
297 | free (lr); | |
298 | } | |
299 | line_tail = NULL; | |
300 | return rv; | |
301 | } | |
302 | ||
303 | /* Standard plugin API registerable hook. */ | |
304 | static enum ld_plugin_status | |
305 | oncleanup (void) | |
306 | { | |
307 | if (prevfile) | |
308 | { | |
309 | free (prevfile); | |
310 | prevfile = NULL; | |
311 | } | |
312 | if (line_head) | |
313 | { | |
314 | linerec *lr; | |
315 | while ((lr = line_head)) | |
316 | { | |
317 | line_head = lr->next; | |
318 | free (lr); | |
319 | } | |
320 | line_tail = NULL; | |
321 | } | |
322 | return LDPS_OK; | |
323 | } | |
324 | ||
325 | /* Standard plugin API entry point. */ | |
326 | enum ld_plugin_status | |
327 | onload (struct ld_plugin_tv *tv) | |
328 | { | |
329 | enum ld_plugin_status rv; | |
330 | ||
331 | /* This plugin requires a valid tv array. */ | |
332 | if (!tv) | |
333 | return LDPS_ERR; | |
334 | ||
335 | /* First entry should always be LDPT_MESSAGE, letting us get | |
336 | hold of it easily so we can send output straight away. */ | |
337 | if (tv[0].tv_tag == LDPT_MESSAGE) | |
338 | tv_message = tv[0].tv_u.tv_message; | |
339 | ||
340 | do | |
341 | if ((rv = parse_tv_tag (tv)) != LDPS_OK) | |
342 | return rv; | |
343 | while ((tv++)->tv_tag != LDPT_NULL); | |
344 | ||
345 | /* Register hooks. */ | |
bcac599f L |
346 | if (tv_register_claim_file |
347 | && tv_register_all_symbols_read | |
348 | && tv_register_cleanup) | |
bf6d8037 | 349 | { |
bcac599f L |
350 | (*tv_register_claim_file) (onclaim_file); |
351 | (*tv_register_all_symbols_read) (onall_symbols_read); | |
352 | (*tv_register_cleanup) (oncleanup); | |
bf6d8037 | 353 | } |
bf6d8037 HC |
354 | fflush (NULL); |
355 | return LDPS_OK; | |
356 | } | |
357 | #endif /* BFD_SUPPORTS_PLUGINS */ |