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23181151 DJ |
1 | /* XML target description support for GDB. |
2 | ||
3 | Copyright (C) 2006 | |
4 | Free Software Foundation, Inc. | |
5 | ||
6 | Contributed by CodeSourcery. | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
23 | Boston, MA 02110-1301, USA. */ | |
24 | ||
25 | #include "defs.h" | |
123dc839 | 26 | #include "gdbtypes.h" |
23181151 DJ |
27 | #include "target.h" |
28 | #include "target-descriptions.h" | |
29 | #include "xml-support.h" | |
30 | #include "xml-tdesc.h" | |
31 | ||
108546a0 DJ |
32 | #include "filenames.h" |
33 | ||
23181151 DJ |
34 | #include "gdb_assert.h" |
35 | ||
36 | #if !defined(HAVE_LIBEXPAT) | |
37 | ||
38 | /* Parse DOCUMENT into a target description. Or don't, since we don't have | |
39 | an XML parser. */ | |
40 | ||
41 | static struct target_desc * | |
108546a0 DJ |
42 | tdesc_parse_xml (const char *document, xml_fetch_another fetcher, |
43 | void *fetcher_baton) | |
23181151 DJ |
44 | { |
45 | static int have_warned; | |
46 | ||
47 | if (!have_warned) | |
48 | { | |
49 | have_warned = 1; | |
50 | warning (_("Can not parse XML target description; XML support was " | |
51 | "disabled at compile time")); | |
52 | } | |
53 | ||
54 | return NULL; | |
55 | } | |
56 | ||
57 | #else /* HAVE_LIBEXPAT */ | |
58 | ||
fc6e0168 DJ |
59 | /* A record of every XML description we have parsed. We never discard |
60 | old descriptions, because we never discard gdbarches. As long as we | |
61 | have a gdbarch referencing this description, we want to have a copy | |
62 | of it here, so that if we parse the same XML document again we can | |
63 | return the same "struct target_desc *"; if they are not singletons, | |
64 | then we will create unnecessary duplicate gdbarches. See | |
65 | gdbarch_list_lookup_by_info. */ | |
66 | ||
67 | struct tdesc_xml_cache | |
68 | { | |
69 | const char *xml_document; | |
70 | struct target_desc *tdesc; | |
71 | }; | |
72 | typedef struct tdesc_xml_cache tdesc_xml_cache_s; | |
73 | DEF_VEC_O(tdesc_xml_cache_s); | |
74 | ||
75 | static VEC(tdesc_xml_cache_s) *xml_cache; | |
76 | ||
23181151 DJ |
77 | /* Callback data for target description parsing. */ |
78 | ||
79 | struct tdesc_parsing_data | |
80 | { | |
81 | /* The target description we are building. */ | |
82 | struct target_desc *tdesc; | |
123dc839 DJ |
83 | |
84 | /* The target feature we are currently parsing, or last parsed. */ | |
85 | struct tdesc_feature *current_feature; | |
86 | ||
87 | /* The register number to use for the next register we see, if | |
88 | it does not have its own. This starts at zero. */ | |
89 | int next_regnum; | |
90 | ||
91 | /* The union we are currently parsing, or last parsed. */ | |
92 | struct type *current_union; | |
23181151 DJ |
93 | }; |
94 | ||
95 | /* Handle the end of an <architecture> element and its value. */ | |
96 | ||
97 | static void | |
98 | tdesc_end_arch (struct gdb_xml_parser *parser, | |
99 | const struct gdb_xml_element *element, | |
100 | void *user_data, const char *body_text) | |
101 | { | |
102 | struct tdesc_parsing_data *data = user_data; | |
103 | const struct bfd_arch_info *arch; | |
104 | ||
105 | arch = bfd_scan_arch (body_text); | |
106 | if (arch == NULL) | |
107 | gdb_xml_error (parser, _("Target description specified unknown " | |
108 | "architecture \"%s\""), body_text); | |
109 | set_tdesc_architecture (data->tdesc, arch); | |
110 | } | |
111 | ||
1780a0ed DJ |
112 | /* Handle the start of a <target> element. */ |
113 | ||
114 | static void | |
115 | tdesc_start_target (struct gdb_xml_parser *parser, | |
116 | const struct gdb_xml_element *element, | |
117 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
118 | { | |
119 | struct tdesc_parsing_data *data = user_data; | |
120 | char *version = VEC_index (gdb_xml_value_s, attributes, 0)->value; | |
121 | ||
122 | if (strcmp (version, "1.0") != 0) | |
123 | gdb_xml_error (parser, | |
124 | _("Target description has unsupported version \"%s\""), | |
125 | version); | |
126 | } | |
127 | ||
123dc839 DJ |
128 | /* Handle the start of a <feature> element. */ |
129 | ||
130 | static void | |
131 | tdesc_start_feature (struct gdb_xml_parser *parser, | |
132 | const struct gdb_xml_element *element, | |
133 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
134 | { | |
135 | struct tdesc_parsing_data *data = user_data; | |
136 | char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value; | |
137 | ||
138 | data->current_feature = tdesc_create_feature (data->tdesc, name); | |
139 | } | |
140 | ||
141 | /* Handle the start of a <reg> element. Fill in the optional | |
142 | attributes and attach it to the containing feature. */ | |
143 | ||
144 | static void | |
145 | tdesc_start_reg (struct gdb_xml_parser *parser, | |
146 | const struct gdb_xml_element *element, | |
147 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
148 | { | |
149 | struct tdesc_parsing_data *data = user_data; | |
150 | struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes); | |
151 | int ix = 0, length; | |
152 | char *name, *group, *type; | |
153 | int bitsize, regnum, save_restore; | |
154 | ||
155 | length = VEC_length (gdb_xml_value_s, attributes); | |
156 | ||
157 | name = attrs[ix++].value; | |
158 | bitsize = * (ULONGEST *) attrs[ix++].value; | |
159 | ||
160 | if (ix < length && strcmp (attrs[ix].name, "regnum") == 0) | |
161 | regnum = * (ULONGEST *) attrs[ix++].value; | |
162 | else | |
163 | regnum = data->next_regnum; | |
164 | ||
165 | if (ix < length && strcmp (attrs[ix].name, "type") == 0) | |
166 | type = attrs[ix++].value; | |
167 | else | |
168 | type = "int"; | |
169 | ||
170 | if (ix < length && strcmp (attrs[ix].name, "group") == 0) | |
171 | group = attrs[ix++].value; | |
172 | else | |
173 | group = NULL; | |
174 | ||
175 | if (ix < length && strcmp (attrs[ix].name, "save-restore") == 0) | |
176 | save_restore = * (ULONGEST *) attrs[ix++].value; | |
177 | else | |
178 | save_restore = 1; | |
179 | ||
180 | if (strcmp (type, "int") != 0 | |
181 | && strcmp (type, "float") != 0 | |
d9cc5895 DJ |
182 | && strcmp (type, "code_ptr") != 0 |
183 | && strcmp (type, "data_ptr") != 0 | |
123dc839 DJ |
184 | && tdesc_named_type (data->current_feature, type) == NULL) |
185 | gdb_xml_error (parser, _("Register \"%s\" has unknown type \"%s\""), | |
186 | name, type); | |
187 | ||
188 | tdesc_create_reg (data->current_feature, name, regnum, save_restore, group, | |
189 | bitsize, type); | |
190 | ||
191 | data->next_regnum = regnum + 1; | |
192 | } | |
193 | ||
194 | /* Handle the start of a <union> element. Initialize the type and | |
195 | record it with the current feature. */ | |
196 | ||
197 | static void | |
198 | tdesc_start_union (struct gdb_xml_parser *parser, | |
199 | const struct gdb_xml_element *element, | |
200 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
201 | { | |
202 | struct tdesc_parsing_data *data = user_data; | |
203 | char *id = VEC_index (gdb_xml_value_s, attributes, 0)->value; | |
204 | struct type *type; | |
205 | ||
206 | type = init_composite_type (NULL, TYPE_CODE_UNION); | |
207 | TYPE_NAME (type) = xstrdup (id); | |
208 | tdesc_record_type (data->current_feature, type); | |
209 | data->current_union = type; | |
210 | } | |
211 | ||
212 | /* Handle the end of a <union> element. */ | |
213 | ||
214 | static void | |
215 | tdesc_end_union (struct gdb_xml_parser *parser, | |
216 | const struct gdb_xml_element *element, | |
217 | void *user_data, const char *body_text) | |
218 | { | |
219 | struct tdesc_parsing_data *data = user_data; | |
220 | int i; | |
221 | ||
222 | /* If any of the children of this union are vectors, flag the union | |
223 | as a vector also. This allows e.g. a union of two vector types | |
224 | to show up automatically in "info vector". */ | |
225 | for (i = 0; i < TYPE_NFIELDS (data->current_union); i++) | |
226 | if (TYPE_VECTOR (TYPE_FIELD_TYPE (data->current_union, i))) | |
227 | { | |
228 | TYPE_FLAGS (data->current_union) |= TYPE_FLAG_VECTOR; | |
229 | break; | |
230 | } | |
231 | } | |
232 | ||
233 | /* Handle the start of a <field> element. Attach the field to the | |
234 | current union. */ | |
235 | ||
236 | static void | |
237 | tdesc_start_field (struct gdb_xml_parser *parser, | |
238 | const struct gdb_xml_element *element, | |
239 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
240 | { | |
241 | struct tdesc_parsing_data *data = user_data; | |
242 | struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes); | |
243 | struct type *type, *field_type; | |
244 | char *field_name, *field_type_id; | |
245 | ||
246 | field_name = attrs[0].value; | |
247 | field_type_id = attrs[1].value; | |
248 | ||
249 | field_type = tdesc_named_type (data->current_feature, field_type_id); | |
250 | if (field_type == NULL) | |
251 | gdb_xml_error (parser, _("Union field \"%s\" references undefined " | |
252 | "type \"%s\""), | |
253 | field_name, field_type_id); | |
254 | ||
255 | append_composite_type_field (data->current_union, xstrdup (field_name), | |
256 | field_type); | |
257 | } | |
258 | ||
259 | /* Handle the start of a <vector> element. Initialize the type and | |
260 | record it with the current feature. */ | |
261 | ||
262 | static void | |
263 | tdesc_start_vector (struct gdb_xml_parser *parser, | |
264 | const struct gdb_xml_element *element, | |
265 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
266 | { | |
267 | struct tdesc_parsing_data *data = user_data; | |
268 | struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes); | |
269 | struct type *type, *field_type, *range_type; | |
270 | char *id, *field_type_id; | |
271 | int count; | |
272 | ||
273 | id = attrs[0].value; | |
274 | field_type_id = attrs[1].value; | |
275 | count = * (ULONGEST *) attrs[2].value; | |
276 | ||
277 | field_type = tdesc_named_type (data->current_feature, field_type_id); | |
278 | if (field_type == NULL) | |
279 | gdb_xml_error (parser, _("Vector \"%s\" references undefined type \"%s\""), | |
280 | id, field_type_id); | |
281 | ||
282 | /* A vector is just an array plus a special flag. */ | |
283 | range_type = create_range_type (NULL, builtin_type_int, 0, count - 1); | |
284 | type = create_array_type (NULL, field_type, range_type); | |
285 | TYPE_NAME (type) = xstrdup (id); | |
286 | ||
287 | TYPE_FLAGS (type) |= TYPE_FLAG_VECTOR; | |
288 | ||
289 | tdesc_record_type (data->current_feature, type); | |
290 | } | |
291 | ||
23181151 DJ |
292 | /* The elements and attributes of an XML target description. */ |
293 | ||
123dc839 DJ |
294 | static const struct gdb_xml_attribute field_attributes[] = { |
295 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
296 | { "type", GDB_XML_AF_NONE, NULL, NULL }, | |
297 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
298 | }; | |
299 | ||
300 | static const struct gdb_xml_element union_children[] = { | |
301 | { "field", field_attributes, NULL, GDB_XML_EF_REPEATABLE, | |
302 | tdesc_start_field, NULL }, | |
303 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
304 | }; | |
305 | ||
306 | static const struct gdb_xml_attribute reg_attributes[] = { | |
307 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
308 | { "bitsize", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
309 | { "regnum", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL }, | |
310 | { "type", GDB_XML_AF_OPTIONAL, NULL, NULL }, | |
311 | { "group", GDB_XML_AF_OPTIONAL, NULL, NULL }, | |
312 | { "save-restore", GDB_XML_AF_OPTIONAL, | |
313 | gdb_xml_parse_attr_enum, gdb_xml_enums_boolean }, | |
314 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
315 | }; | |
316 | ||
317 | static const struct gdb_xml_attribute union_attributes[] = { | |
318 | { "id", GDB_XML_AF_NONE, NULL, NULL }, | |
319 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
320 | }; | |
321 | ||
322 | static const struct gdb_xml_attribute vector_attributes[] = { | |
323 | { "id", GDB_XML_AF_NONE, NULL, NULL }, | |
324 | { "type", GDB_XML_AF_NONE, NULL, NULL }, | |
325 | { "count", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
326 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
327 | }; | |
328 | ||
329 | static const struct gdb_xml_attribute feature_attributes[] = { | |
330 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
331 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
332 | }; | |
333 | ||
334 | static const struct gdb_xml_element feature_children[] = { | |
335 | { "reg", reg_attributes, NULL, | |
336 | GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE, | |
337 | tdesc_start_reg, NULL }, | |
338 | { "union", union_attributes, union_children, | |
339 | GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE, | |
340 | tdesc_start_union, tdesc_end_union }, | |
341 | { "vector", vector_attributes, NULL, | |
342 | GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE, | |
343 | tdesc_start_vector, NULL }, | |
344 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
345 | }; | |
346 | ||
1780a0ed DJ |
347 | static const struct gdb_xml_attribute target_attributes[] = { |
348 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
349 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
350 | }; | |
351 | ||
123dc839 | 352 | static const struct gdb_xml_element target_children[] = { |
23181151 DJ |
353 | { "architecture", NULL, NULL, GDB_XML_EF_OPTIONAL, |
354 | NULL, tdesc_end_arch }, | |
123dc839 DJ |
355 | { "feature", feature_attributes, feature_children, |
356 | GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE, | |
357 | tdesc_start_feature, NULL }, | |
23181151 DJ |
358 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
359 | }; | |
360 | ||
123dc839 | 361 | static const struct gdb_xml_element tdesc_elements[] = { |
1780a0ed DJ |
362 | { "target", target_attributes, target_children, GDB_XML_EF_NONE, |
363 | tdesc_start_target, NULL }, | |
23181151 DJ |
364 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
365 | }; | |
366 | ||
367 | /* Parse DOCUMENT into a target description and return it. */ | |
368 | ||
369 | static struct target_desc * | |
108546a0 DJ |
370 | tdesc_parse_xml (const char *document, xml_fetch_another fetcher, |
371 | void *fetcher_baton) | |
23181151 DJ |
372 | { |
373 | struct cleanup *back_to, *result_cleanup; | |
374 | struct gdb_xml_parser *parser; | |
375 | struct tdesc_parsing_data data; | |
fc6e0168 | 376 | struct tdesc_xml_cache *cache; |
108546a0 | 377 | char *expanded_text; |
fc6e0168 | 378 | int ix; |
23181151 | 379 | |
108546a0 DJ |
380 | /* Expand all XInclude directives. */ |
381 | expanded_text = xml_process_xincludes (_("target description"), | |
382 | document, fetcher, fetcher_baton, 0); | |
383 | if (expanded_text == NULL) | |
384 | { | |
385 | warning (_("Could not load XML target description; ignoring")); | |
386 | return NULL; | |
387 | } | |
23181151 | 388 | |
fc6e0168 DJ |
389 | /* Check for an exact match in the list of descriptions we have |
390 | previously parsed. strcmp is a slightly inefficient way to | |
391 | do this; an SHA-1 checksum would work as well. */ | |
392 | for (ix = 0; VEC_iterate (tdesc_xml_cache_s, xml_cache, ix, cache); ix++) | |
393 | if (strcmp (cache->xml_document, expanded_text) == 0) | |
394 | { | |
395 | xfree (expanded_text); | |
396 | return cache->tdesc; | |
397 | } | |
398 | ||
399 | back_to = make_cleanup (null_cleanup, NULL); | |
23181151 DJ |
400 | parser = gdb_xml_create_parser_and_cleanup (_("target description"), |
401 | tdesc_elements, &data); | |
108546a0 | 402 | gdb_xml_use_dtd (parser, "gdb-target.dtd"); |
23181151 | 403 | |
108546a0 | 404 | memset (&data, 0, sizeof (struct tdesc_parsing_data)); |
23181151 DJ |
405 | data.tdesc = allocate_target_description (); |
406 | result_cleanup = make_cleanup_free_target_description (data.tdesc); | |
fc6e0168 | 407 | make_cleanup (xfree, expanded_text); |
23181151 | 408 | |
108546a0 | 409 | if (gdb_xml_parse (parser, expanded_text) == 0) |
23181151 DJ |
410 | { |
411 | /* Parsed successfully. */ | |
fc6e0168 DJ |
412 | struct tdesc_xml_cache new_cache; |
413 | ||
414 | new_cache.xml_document = expanded_text; | |
415 | new_cache.tdesc = data.tdesc; | |
416 | VEC_safe_push (tdesc_xml_cache_s, xml_cache, &new_cache); | |
23181151 DJ |
417 | discard_cleanups (result_cleanup); |
418 | do_cleanups (back_to); | |
419 | return data.tdesc; | |
420 | } | |
421 | else | |
422 | { | |
423 | warning (_("Could not load XML target description; ignoring")); | |
424 | do_cleanups (back_to); | |
425 | return NULL; | |
426 | } | |
427 | } | |
23181151 DJ |
428 | #endif /* HAVE_LIBEXPAT */ |
429 | \f | |
430 | ||
431 | /* Close FILE. */ | |
432 | ||
433 | static void | |
434 | do_cleanup_fclose (void *file) | |
435 | { | |
436 | fclose (file); | |
437 | } | |
438 | ||
439 | /* Open FILENAME, read all its text into memory, close it, and return | |
440 | the text. If something goes wrong, return NULL and warn. */ | |
441 | ||
442 | static char * | |
108546a0 | 443 | fetch_xml_from_file (const char *filename, void *baton) |
23181151 | 444 | { |
108546a0 | 445 | const char *dirname = baton; |
23181151 DJ |
446 | FILE *file; |
447 | struct cleanup *back_to; | |
448 | char *text; | |
449 | size_t len, offset; | |
450 | ||
108546a0 | 451 | if (dirname && *dirname) |
23181151 | 452 | { |
108546a0 DJ |
453 | char *fullname = concat (dirname, "/", filename, NULL); |
454 | if (fullname == NULL) | |
455 | nomem (0); | |
456 | file = fopen (fullname, FOPEN_RT); | |
457 | xfree (fullname); | |
23181151 | 458 | } |
108546a0 DJ |
459 | else |
460 | file = fopen (filename, FOPEN_RT); | |
461 | ||
462 | if (file == NULL) | |
463 | return NULL; | |
464 | ||
23181151 DJ |
465 | back_to = make_cleanup (do_cleanup_fclose, file); |
466 | ||
467 | /* Read in the whole file, one chunk at a time. */ | |
468 | len = 4096; | |
469 | offset = 0; | |
470 | text = xmalloc (len); | |
471 | make_cleanup (free_current_contents, &text); | |
472 | while (1) | |
473 | { | |
474 | size_t bytes_read; | |
475 | ||
476 | /* Continue reading where the last read left off. Leave at least | |
477 | one byte so that we can NUL-terminate the result. */ | |
478 | bytes_read = fread (text + offset, 1, len - offset - 1, file); | |
479 | if (ferror (file)) | |
480 | { | |
481 | warning (_("Read error from \"%s\""), filename); | |
482 | do_cleanups (back_to); | |
483 | return NULL; | |
484 | } | |
485 | ||
486 | offset += bytes_read; | |
487 | ||
488 | if (feof (file)) | |
489 | break; | |
490 | ||
491 | len = len * 2; | |
492 | text = xrealloc (text, len); | |
493 | } | |
494 | ||
495 | fclose (file); | |
496 | discard_cleanups (back_to); | |
497 | ||
498 | text[offset] = '\0'; | |
499 | return text; | |
500 | } | |
501 | ||
502 | /* Read an XML target description from FILENAME. Parse it, and return | |
503 | the parsed description. */ | |
504 | ||
505 | const struct target_desc * | |
506 | file_read_description_xml (const char *filename) | |
507 | { | |
508 | struct target_desc *tdesc; | |
509 | char *tdesc_str; | |
510 | struct cleanup *back_to; | |
108546a0 | 511 | char *dirname; |
23181151 | 512 | |
108546a0 | 513 | tdesc_str = fetch_xml_from_file (filename, NULL); |
23181151 | 514 | if (tdesc_str == NULL) |
108546a0 DJ |
515 | { |
516 | warning (_("Could not open \"%s\""), filename); | |
517 | return NULL; | |
518 | } | |
23181151 DJ |
519 | |
520 | back_to = make_cleanup (xfree, tdesc_str); | |
108546a0 | 521 | |
e1024ff1 DJ |
522 | dirname = ldirname (filename); |
523 | if (dirname != NULL) | |
524 | make_cleanup (xfree, dirname); | |
108546a0 DJ |
525 | |
526 | tdesc = tdesc_parse_xml (tdesc_str, fetch_xml_from_file, dirname); | |
23181151 DJ |
527 | do_cleanups (back_to); |
528 | ||
529 | return tdesc; | |
530 | } | |
531 | ||
108546a0 DJ |
532 | /* Read a string representation of available features from the target, |
533 | using TARGET_OBJECT_AVAILABLE_FEATURES. The returned string is | |
534 | malloc allocated and NUL-terminated. NAME should be a non-NULL | |
535 | string identifying the XML document we want; the top level document | |
536 | is "target.xml". Other calls may be performed for the DTD or | |
537 | for <xi:include>. */ | |
538 | ||
539 | static char * | |
540 | fetch_available_features_from_target (const char *name, void *baton_) | |
541 | { | |
542 | struct target_ops *ops = baton_; | |
543 | ||
544 | /* Read this object as a string. This ensures that a NUL | |
545 | terminator is added. */ | |
546 | return target_read_stralloc (ops, | |
547 | TARGET_OBJECT_AVAILABLE_FEATURES, | |
548 | name); | |
549 | } | |
550 | \f | |
551 | ||
23181151 DJ |
552 | /* Read an XML target description using OPS. Parse it, and return the |
553 | parsed description. */ | |
554 | ||
555 | const struct target_desc * | |
556 | target_read_description_xml (struct target_ops *ops) | |
557 | { | |
558 | struct target_desc *tdesc; | |
559 | char *tdesc_str; | |
560 | struct cleanup *back_to; | |
561 | ||
108546a0 | 562 | tdesc_str = fetch_available_features_from_target ("target.xml", ops); |
23181151 DJ |
563 | if (tdesc_str == NULL) |
564 | return NULL; | |
565 | ||
566 | back_to = make_cleanup (xfree, tdesc_str); | |
108546a0 DJ |
567 | tdesc = tdesc_parse_xml (tdesc_str, |
568 | fetch_available_features_from_target, | |
569 | ops); | |
23181151 DJ |
570 | do_cleanups (back_to); |
571 | ||
572 | return tdesc; | |
573 | } |