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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 | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
23181151 DJ |
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 | |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
23181151 DJ |
22 | |
23 | #include "defs.h" | |
123dc839 | 24 | #include "gdbtypes.h" |
23181151 DJ |
25 | #include "target.h" |
26 | #include "target-descriptions.h" | |
27 | #include "xml-support.h" | |
28 | #include "xml-tdesc.h" | |
29 | ||
108546a0 DJ |
30 | #include "filenames.h" |
31 | ||
23181151 DJ |
32 | #include "gdb_assert.h" |
33 | ||
34 | #if !defined(HAVE_LIBEXPAT) | |
35 | ||
36 | /* Parse DOCUMENT into a target description. Or don't, since we don't have | |
37 | an XML parser. */ | |
38 | ||
39 | static struct target_desc * | |
108546a0 DJ |
40 | tdesc_parse_xml (const char *document, xml_fetch_another fetcher, |
41 | void *fetcher_baton) | |
23181151 DJ |
42 | { |
43 | static int have_warned; | |
44 | ||
45 | if (!have_warned) | |
46 | { | |
47 | have_warned = 1; | |
48 | warning (_("Can not parse XML target description; XML support was " | |
49 | "disabled at compile time")); | |
50 | } | |
51 | ||
52 | return NULL; | |
53 | } | |
54 | ||
55 | #else /* HAVE_LIBEXPAT */ | |
56 | ||
fc6e0168 DJ |
57 | /* A record of every XML description we have parsed. We never discard |
58 | old descriptions, because we never discard gdbarches. As long as we | |
59 | have a gdbarch referencing this description, we want to have a copy | |
60 | of it here, so that if we parse the same XML document again we can | |
61 | return the same "struct target_desc *"; if they are not singletons, | |
62 | then we will create unnecessary duplicate gdbarches. See | |
63 | gdbarch_list_lookup_by_info. */ | |
64 | ||
65 | struct tdesc_xml_cache | |
66 | { | |
67 | const char *xml_document; | |
68 | struct target_desc *tdesc; | |
69 | }; | |
70 | typedef struct tdesc_xml_cache tdesc_xml_cache_s; | |
71 | DEF_VEC_O(tdesc_xml_cache_s); | |
72 | ||
73 | static VEC(tdesc_xml_cache_s) *xml_cache; | |
74 | ||
23181151 DJ |
75 | /* Callback data for target description parsing. */ |
76 | ||
77 | struct tdesc_parsing_data | |
78 | { | |
79 | /* The target description we are building. */ | |
80 | struct target_desc *tdesc; | |
123dc839 DJ |
81 | |
82 | /* The target feature we are currently parsing, or last parsed. */ | |
83 | struct tdesc_feature *current_feature; | |
84 | ||
85 | /* The register number to use for the next register we see, if | |
86 | it does not have its own. This starts at zero. */ | |
87 | int next_regnum; | |
88 | ||
89 | /* The union we are currently parsing, or last parsed. */ | |
90 | struct type *current_union; | |
23181151 DJ |
91 | }; |
92 | ||
93 | /* Handle the end of an <architecture> element and its value. */ | |
94 | ||
95 | static void | |
96 | tdesc_end_arch (struct gdb_xml_parser *parser, | |
97 | const struct gdb_xml_element *element, | |
98 | void *user_data, const char *body_text) | |
99 | { | |
100 | struct tdesc_parsing_data *data = user_data; | |
101 | const struct bfd_arch_info *arch; | |
102 | ||
103 | arch = bfd_scan_arch (body_text); | |
104 | if (arch == NULL) | |
105 | gdb_xml_error (parser, _("Target description specified unknown " | |
106 | "architecture \"%s\""), body_text); | |
107 | set_tdesc_architecture (data->tdesc, arch); | |
108 | } | |
109 | ||
1780a0ed DJ |
110 | /* Handle the start of a <target> element. */ |
111 | ||
112 | static void | |
113 | tdesc_start_target (struct gdb_xml_parser *parser, | |
114 | const struct gdb_xml_element *element, | |
115 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
116 | { | |
117 | struct tdesc_parsing_data *data = user_data; | |
118 | char *version = VEC_index (gdb_xml_value_s, attributes, 0)->value; | |
119 | ||
120 | if (strcmp (version, "1.0") != 0) | |
121 | gdb_xml_error (parser, | |
122 | _("Target description has unsupported version \"%s\""), | |
123 | version); | |
124 | } | |
125 | ||
123dc839 DJ |
126 | /* Handle the start of a <feature> element. */ |
127 | ||
128 | static void | |
129 | tdesc_start_feature (struct gdb_xml_parser *parser, | |
130 | const struct gdb_xml_element *element, | |
131 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
132 | { | |
133 | struct tdesc_parsing_data *data = user_data; | |
134 | char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value; | |
135 | ||
136 | data->current_feature = tdesc_create_feature (data->tdesc, name); | |
137 | } | |
138 | ||
139 | /* Handle the start of a <reg> element. Fill in the optional | |
140 | attributes and attach it to the containing feature. */ | |
141 | ||
142 | static void | |
143 | tdesc_start_reg (struct gdb_xml_parser *parser, | |
144 | const struct gdb_xml_element *element, | |
145 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
146 | { | |
147 | struct tdesc_parsing_data *data = user_data; | |
148 | struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes); | |
149 | int ix = 0, length; | |
150 | char *name, *group, *type; | |
151 | int bitsize, regnum, save_restore; | |
152 | ||
153 | length = VEC_length (gdb_xml_value_s, attributes); | |
154 | ||
155 | name = attrs[ix++].value; | |
156 | bitsize = * (ULONGEST *) attrs[ix++].value; | |
157 | ||
158 | if (ix < length && strcmp (attrs[ix].name, "regnum") == 0) | |
159 | regnum = * (ULONGEST *) attrs[ix++].value; | |
160 | else | |
161 | regnum = data->next_regnum; | |
162 | ||
163 | if (ix < length && strcmp (attrs[ix].name, "type") == 0) | |
164 | type = attrs[ix++].value; | |
165 | else | |
166 | type = "int"; | |
167 | ||
168 | if (ix < length && strcmp (attrs[ix].name, "group") == 0) | |
169 | group = attrs[ix++].value; | |
170 | else | |
171 | group = NULL; | |
172 | ||
173 | if (ix < length && strcmp (attrs[ix].name, "save-restore") == 0) | |
174 | save_restore = * (ULONGEST *) attrs[ix++].value; | |
175 | else | |
176 | save_restore = 1; | |
177 | ||
178 | if (strcmp (type, "int") != 0 | |
179 | && strcmp (type, "float") != 0 | |
d9cc5895 DJ |
180 | && strcmp (type, "code_ptr") != 0 |
181 | && strcmp (type, "data_ptr") != 0 | |
123dc839 DJ |
182 | && tdesc_named_type (data->current_feature, type) == NULL) |
183 | gdb_xml_error (parser, _("Register \"%s\" has unknown type \"%s\""), | |
184 | name, type); | |
185 | ||
186 | tdesc_create_reg (data->current_feature, name, regnum, save_restore, group, | |
187 | bitsize, type); | |
188 | ||
189 | data->next_regnum = regnum + 1; | |
190 | } | |
191 | ||
192 | /* Handle the start of a <union> element. Initialize the type and | |
193 | record it with the current feature. */ | |
194 | ||
195 | static void | |
196 | tdesc_start_union (struct gdb_xml_parser *parser, | |
197 | const struct gdb_xml_element *element, | |
198 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
199 | { | |
200 | struct tdesc_parsing_data *data = user_data; | |
201 | char *id = VEC_index (gdb_xml_value_s, attributes, 0)->value; | |
202 | struct type *type; | |
203 | ||
204 | type = init_composite_type (NULL, TYPE_CODE_UNION); | |
205 | TYPE_NAME (type) = xstrdup (id); | |
206 | tdesc_record_type (data->current_feature, type); | |
207 | data->current_union = type; | |
208 | } | |
209 | ||
210 | /* Handle the end of a <union> element. */ | |
211 | ||
212 | static void | |
213 | tdesc_end_union (struct gdb_xml_parser *parser, | |
214 | const struct gdb_xml_element *element, | |
215 | void *user_data, const char *body_text) | |
216 | { | |
217 | struct tdesc_parsing_data *data = user_data; | |
218 | int i; | |
219 | ||
220 | /* If any of the children of this union are vectors, flag the union | |
221 | as a vector also. This allows e.g. a union of two vector types | |
222 | to show up automatically in "info vector". */ | |
223 | for (i = 0; i < TYPE_NFIELDS (data->current_union); i++) | |
224 | if (TYPE_VECTOR (TYPE_FIELD_TYPE (data->current_union, i))) | |
225 | { | |
226 | TYPE_FLAGS (data->current_union) |= TYPE_FLAG_VECTOR; | |
227 | break; | |
228 | } | |
229 | } | |
230 | ||
231 | /* Handle the start of a <field> element. Attach the field to the | |
232 | current union. */ | |
233 | ||
234 | static void | |
235 | tdesc_start_field (struct gdb_xml_parser *parser, | |
236 | const struct gdb_xml_element *element, | |
237 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
238 | { | |
239 | struct tdesc_parsing_data *data = user_data; | |
240 | struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes); | |
241 | struct type *type, *field_type; | |
242 | char *field_name, *field_type_id; | |
243 | ||
244 | field_name = attrs[0].value; | |
245 | field_type_id = attrs[1].value; | |
246 | ||
247 | field_type = tdesc_named_type (data->current_feature, field_type_id); | |
248 | if (field_type == NULL) | |
249 | gdb_xml_error (parser, _("Union field \"%s\" references undefined " | |
250 | "type \"%s\""), | |
251 | field_name, field_type_id); | |
252 | ||
253 | append_composite_type_field (data->current_union, xstrdup (field_name), | |
254 | field_type); | |
255 | } | |
256 | ||
257 | /* Handle the start of a <vector> element. Initialize the type and | |
258 | record it with the current feature. */ | |
259 | ||
260 | static void | |
261 | tdesc_start_vector (struct gdb_xml_parser *parser, | |
262 | const struct gdb_xml_element *element, | |
263 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
264 | { | |
265 | struct tdesc_parsing_data *data = user_data; | |
266 | struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes); | |
267 | struct type *type, *field_type, *range_type; | |
268 | char *id, *field_type_id; | |
269 | int count; | |
270 | ||
271 | id = attrs[0].value; | |
272 | field_type_id = attrs[1].value; | |
273 | count = * (ULONGEST *) attrs[2].value; | |
274 | ||
275 | field_type = tdesc_named_type (data->current_feature, field_type_id); | |
276 | if (field_type == NULL) | |
277 | gdb_xml_error (parser, _("Vector \"%s\" references undefined type \"%s\""), | |
278 | id, field_type_id); | |
279 | ||
280 | /* A vector is just an array plus a special flag. */ | |
281 | range_type = create_range_type (NULL, builtin_type_int, 0, count - 1); | |
282 | type = create_array_type (NULL, field_type, range_type); | |
283 | TYPE_NAME (type) = xstrdup (id); | |
284 | ||
285 | TYPE_FLAGS (type) |= TYPE_FLAG_VECTOR; | |
286 | ||
287 | tdesc_record_type (data->current_feature, type); | |
288 | } | |
289 | ||
23181151 DJ |
290 | /* The elements and attributes of an XML target description. */ |
291 | ||
123dc839 DJ |
292 | static const struct gdb_xml_attribute field_attributes[] = { |
293 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
294 | { "type", GDB_XML_AF_NONE, NULL, NULL }, | |
295 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
296 | }; | |
297 | ||
298 | static const struct gdb_xml_element union_children[] = { | |
299 | { "field", field_attributes, NULL, GDB_XML_EF_REPEATABLE, | |
300 | tdesc_start_field, NULL }, | |
301 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
302 | }; | |
303 | ||
304 | static const struct gdb_xml_attribute reg_attributes[] = { | |
305 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
306 | { "bitsize", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
307 | { "regnum", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL }, | |
308 | { "type", GDB_XML_AF_OPTIONAL, NULL, NULL }, | |
309 | { "group", GDB_XML_AF_OPTIONAL, NULL, NULL }, | |
310 | { "save-restore", GDB_XML_AF_OPTIONAL, | |
311 | gdb_xml_parse_attr_enum, gdb_xml_enums_boolean }, | |
312 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
313 | }; | |
314 | ||
315 | static const struct gdb_xml_attribute union_attributes[] = { | |
316 | { "id", GDB_XML_AF_NONE, NULL, NULL }, | |
317 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
318 | }; | |
319 | ||
320 | static const struct gdb_xml_attribute vector_attributes[] = { | |
321 | { "id", GDB_XML_AF_NONE, NULL, NULL }, | |
322 | { "type", GDB_XML_AF_NONE, NULL, NULL }, | |
323 | { "count", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
324 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
325 | }; | |
326 | ||
327 | static const struct gdb_xml_attribute feature_attributes[] = { | |
328 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
329 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
330 | }; | |
331 | ||
332 | static const struct gdb_xml_element feature_children[] = { | |
333 | { "reg", reg_attributes, NULL, | |
334 | GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE, | |
335 | tdesc_start_reg, NULL }, | |
336 | { "union", union_attributes, union_children, | |
337 | GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE, | |
338 | tdesc_start_union, tdesc_end_union }, | |
339 | { "vector", vector_attributes, NULL, | |
340 | GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE, | |
341 | tdesc_start_vector, NULL }, | |
342 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
343 | }; | |
344 | ||
1780a0ed DJ |
345 | static const struct gdb_xml_attribute target_attributes[] = { |
346 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
347 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
348 | }; | |
349 | ||
123dc839 | 350 | static const struct gdb_xml_element target_children[] = { |
23181151 DJ |
351 | { "architecture", NULL, NULL, GDB_XML_EF_OPTIONAL, |
352 | NULL, tdesc_end_arch }, | |
123dc839 DJ |
353 | { "feature", feature_attributes, feature_children, |
354 | GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE, | |
355 | tdesc_start_feature, NULL }, | |
23181151 DJ |
356 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
357 | }; | |
358 | ||
123dc839 | 359 | static const struct gdb_xml_element tdesc_elements[] = { |
1780a0ed DJ |
360 | { "target", target_attributes, target_children, GDB_XML_EF_NONE, |
361 | tdesc_start_target, NULL }, | |
23181151 DJ |
362 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
363 | }; | |
364 | ||
365 | /* Parse DOCUMENT into a target description and return it. */ | |
366 | ||
367 | static struct target_desc * | |
108546a0 DJ |
368 | tdesc_parse_xml (const char *document, xml_fetch_another fetcher, |
369 | void *fetcher_baton) | |
23181151 DJ |
370 | { |
371 | struct cleanup *back_to, *result_cleanup; | |
372 | struct gdb_xml_parser *parser; | |
373 | struct tdesc_parsing_data data; | |
fc6e0168 | 374 | struct tdesc_xml_cache *cache; |
108546a0 | 375 | char *expanded_text; |
fc6e0168 | 376 | int ix; |
23181151 | 377 | |
108546a0 DJ |
378 | /* Expand all XInclude directives. */ |
379 | expanded_text = xml_process_xincludes (_("target description"), | |
380 | document, fetcher, fetcher_baton, 0); | |
381 | if (expanded_text == NULL) | |
382 | { | |
383 | warning (_("Could not load XML target description; ignoring")); | |
384 | return NULL; | |
385 | } | |
23181151 | 386 | |
fc6e0168 DJ |
387 | /* Check for an exact match in the list of descriptions we have |
388 | previously parsed. strcmp is a slightly inefficient way to | |
389 | do this; an SHA-1 checksum would work as well. */ | |
390 | for (ix = 0; VEC_iterate (tdesc_xml_cache_s, xml_cache, ix, cache); ix++) | |
391 | if (strcmp (cache->xml_document, expanded_text) == 0) | |
392 | { | |
393 | xfree (expanded_text); | |
394 | return cache->tdesc; | |
395 | } | |
396 | ||
397 | back_to = make_cleanup (null_cleanup, NULL); | |
23181151 DJ |
398 | parser = gdb_xml_create_parser_and_cleanup (_("target description"), |
399 | tdesc_elements, &data); | |
108546a0 | 400 | gdb_xml_use_dtd (parser, "gdb-target.dtd"); |
23181151 | 401 | |
108546a0 | 402 | memset (&data, 0, sizeof (struct tdesc_parsing_data)); |
23181151 DJ |
403 | data.tdesc = allocate_target_description (); |
404 | result_cleanup = make_cleanup_free_target_description (data.tdesc); | |
fc6e0168 | 405 | make_cleanup (xfree, expanded_text); |
23181151 | 406 | |
108546a0 | 407 | if (gdb_xml_parse (parser, expanded_text) == 0) |
23181151 DJ |
408 | { |
409 | /* Parsed successfully. */ | |
fc6e0168 DJ |
410 | struct tdesc_xml_cache new_cache; |
411 | ||
412 | new_cache.xml_document = expanded_text; | |
413 | new_cache.tdesc = data.tdesc; | |
414 | VEC_safe_push (tdesc_xml_cache_s, xml_cache, &new_cache); | |
23181151 DJ |
415 | discard_cleanups (result_cleanup); |
416 | do_cleanups (back_to); | |
417 | return data.tdesc; | |
418 | } | |
419 | else | |
420 | { | |
421 | warning (_("Could not load XML target description; ignoring")); | |
422 | do_cleanups (back_to); | |
423 | return NULL; | |
424 | } | |
425 | } | |
23181151 DJ |
426 | #endif /* HAVE_LIBEXPAT */ |
427 | \f | |
428 | ||
429 | /* Close FILE. */ | |
430 | ||
431 | static void | |
432 | do_cleanup_fclose (void *file) | |
433 | { | |
434 | fclose (file); | |
435 | } | |
436 | ||
437 | /* Open FILENAME, read all its text into memory, close it, and return | |
438 | the text. If something goes wrong, return NULL and warn. */ | |
439 | ||
440 | static char * | |
108546a0 | 441 | fetch_xml_from_file (const char *filename, void *baton) |
23181151 | 442 | { |
108546a0 | 443 | const char *dirname = baton; |
23181151 DJ |
444 | FILE *file; |
445 | struct cleanup *back_to; | |
446 | char *text; | |
447 | size_t len, offset; | |
448 | ||
108546a0 | 449 | if (dirname && *dirname) |
23181151 | 450 | { |
108546a0 DJ |
451 | char *fullname = concat (dirname, "/", filename, NULL); |
452 | if (fullname == NULL) | |
453 | nomem (0); | |
454 | file = fopen (fullname, FOPEN_RT); | |
455 | xfree (fullname); | |
23181151 | 456 | } |
108546a0 DJ |
457 | else |
458 | file = fopen (filename, FOPEN_RT); | |
459 | ||
460 | if (file == NULL) | |
461 | return NULL; | |
462 | ||
23181151 DJ |
463 | back_to = make_cleanup (do_cleanup_fclose, file); |
464 | ||
465 | /* Read in the whole file, one chunk at a time. */ | |
466 | len = 4096; | |
467 | offset = 0; | |
468 | text = xmalloc (len); | |
469 | make_cleanup (free_current_contents, &text); | |
470 | while (1) | |
471 | { | |
472 | size_t bytes_read; | |
473 | ||
474 | /* Continue reading where the last read left off. Leave at least | |
475 | one byte so that we can NUL-terminate the result. */ | |
476 | bytes_read = fread (text + offset, 1, len - offset - 1, file); | |
477 | if (ferror (file)) | |
478 | { | |
479 | warning (_("Read error from \"%s\""), filename); | |
480 | do_cleanups (back_to); | |
481 | return NULL; | |
482 | } | |
483 | ||
484 | offset += bytes_read; | |
485 | ||
486 | if (feof (file)) | |
487 | break; | |
488 | ||
489 | len = len * 2; | |
490 | text = xrealloc (text, len); | |
491 | } | |
492 | ||
493 | fclose (file); | |
494 | discard_cleanups (back_to); | |
495 | ||
496 | text[offset] = '\0'; | |
497 | return text; | |
498 | } | |
499 | ||
500 | /* Read an XML target description from FILENAME. Parse it, and return | |
501 | the parsed description. */ | |
502 | ||
503 | const struct target_desc * | |
504 | file_read_description_xml (const char *filename) | |
505 | { | |
506 | struct target_desc *tdesc; | |
507 | char *tdesc_str; | |
508 | struct cleanup *back_to; | |
108546a0 | 509 | char *dirname; |
23181151 | 510 | |
108546a0 | 511 | tdesc_str = fetch_xml_from_file (filename, NULL); |
23181151 | 512 | if (tdesc_str == NULL) |
108546a0 DJ |
513 | { |
514 | warning (_("Could not open \"%s\""), filename); | |
515 | return NULL; | |
516 | } | |
23181151 DJ |
517 | |
518 | back_to = make_cleanup (xfree, tdesc_str); | |
108546a0 | 519 | |
e1024ff1 DJ |
520 | dirname = ldirname (filename); |
521 | if (dirname != NULL) | |
522 | make_cleanup (xfree, dirname); | |
108546a0 DJ |
523 | |
524 | tdesc = tdesc_parse_xml (tdesc_str, fetch_xml_from_file, dirname); | |
23181151 DJ |
525 | do_cleanups (back_to); |
526 | ||
527 | return tdesc; | |
528 | } | |
529 | ||
108546a0 DJ |
530 | /* Read a string representation of available features from the target, |
531 | using TARGET_OBJECT_AVAILABLE_FEATURES. The returned string is | |
532 | malloc allocated and NUL-terminated. NAME should be a non-NULL | |
533 | string identifying the XML document we want; the top level document | |
534 | is "target.xml". Other calls may be performed for the DTD or | |
535 | for <xi:include>. */ | |
536 | ||
537 | static char * | |
538 | fetch_available_features_from_target (const char *name, void *baton_) | |
539 | { | |
540 | struct target_ops *ops = baton_; | |
541 | ||
542 | /* Read this object as a string. This ensures that a NUL | |
543 | terminator is added. */ | |
544 | return target_read_stralloc (ops, | |
545 | TARGET_OBJECT_AVAILABLE_FEATURES, | |
546 | name); | |
547 | } | |
548 | \f | |
549 | ||
23181151 DJ |
550 | /* Read an XML target description using OPS. Parse it, and return the |
551 | parsed description. */ | |
552 | ||
553 | const struct target_desc * | |
554 | target_read_description_xml (struct target_ops *ops) | |
555 | { | |
556 | struct target_desc *tdesc; | |
557 | char *tdesc_str; | |
558 | struct cleanup *back_to; | |
559 | ||
108546a0 | 560 | tdesc_str = fetch_available_features_from_target ("target.xml", ops); |
23181151 DJ |
561 | if (tdesc_str == NULL) |
562 | return NULL; | |
563 | ||
564 | back_to = make_cleanup (xfree, tdesc_str); | |
108546a0 DJ |
565 | tdesc = tdesc_parse_xml (tdesc_str, |
566 | fetch_available_features_from_target, | |
567 | ops); | |
23181151 DJ |
568 | do_cleanups (back_to); |
569 | ||
570 | return tdesc; | |
571 | } |