| 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" |
| 26 | #include "gdbtypes.h" |
| 27 | #include "target.h" |
| 28 | #include "target-descriptions.h" |
| 29 | #include "xml-support.h" |
| 30 | #include "xml-tdesc.h" |
| 31 | |
| 32 | #include "filenames.h" |
| 33 | |
| 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 * |
| 42 | tdesc_parse_xml (const char *document, xml_fetch_another fetcher, |
| 43 | void *fetcher_baton) |
| 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 | |
| 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 | |
| 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; |
| 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; |
| 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 | |
| 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 | |
| 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 |
| 182 | && strcmp (type, "code_ptr") != 0 |
| 183 | && strcmp (type, "data_ptr") != 0 |
| 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 | |
| 292 | /* The elements and attributes of an XML target description. */ |
| 293 | |
| 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 | |
| 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 | |
| 352 | static const struct gdb_xml_element target_children[] = { |
| 353 | { "architecture", NULL, NULL, GDB_XML_EF_OPTIONAL, |
| 354 | NULL, tdesc_end_arch }, |
| 355 | { "feature", feature_attributes, feature_children, |
| 356 | GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE, |
| 357 | tdesc_start_feature, NULL }, |
| 358 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
| 359 | }; |
| 360 | |
| 361 | static const struct gdb_xml_element tdesc_elements[] = { |
| 362 | { "target", target_attributes, target_children, GDB_XML_EF_NONE, |
| 363 | tdesc_start_target, NULL }, |
| 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 * |
| 370 | tdesc_parse_xml (const char *document, xml_fetch_another fetcher, |
| 371 | void *fetcher_baton) |
| 372 | { |
| 373 | struct cleanup *back_to, *result_cleanup; |
| 374 | struct gdb_xml_parser *parser; |
| 375 | struct tdesc_parsing_data data; |
| 376 | struct tdesc_xml_cache *cache; |
| 377 | char *expanded_text; |
| 378 | int ix; |
| 379 | |
| 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 | } |
| 388 | |
| 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); |
| 400 | parser = gdb_xml_create_parser_and_cleanup (_("target description"), |
| 401 | tdesc_elements, &data); |
| 402 | gdb_xml_use_dtd (parser, "gdb-target.dtd"); |
| 403 | |
| 404 | memset (&data, 0, sizeof (struct tdesc_parsing_data)); |
| 405 | data.tdesc = allocate_target_description (); |
| 406 | result_cleanup = make_cleanup_free_target_description (data.tdesc); |
| 407 | make_cleanup (xfree, expanded_text); |
| 408 | |
| 409 | if (gdb_xml_parse (parser, expanded_text) == 0) |
| 410 | { |
| 411 | /* Parsed successfully. */ |
| 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); |
| 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 | } |
| 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 * |
| 443 | fetch_xml_from_file (const char *filename, void *baton) |
| 444 | { |
| 445 | const char *dirname = baton; |
| 446 | FILE *file; |
| 447 | struct cleanup *back_to; |
| 448 | char *text; |
| 449 | size_t len, offset; |
| 450 | |
| 451 | if (dirname && *dirname) |
| 452 | { |
| 453 | char *fullname = concat (dirname, "/", filename, NULL); |
| 454 | if (fullname == NULL) |
| 455 | nomem (0); |
| 456 | file = fopen (fullname, FOPEN_RT); |
| 457 | xfree (fullname); |
| 458 | } |
| 459 | else |
| 460 | file = fopen (filename, FOPEN_RT); |
| 461 | |
| 462 | if (file == NULL) |
| 463 | return NULL; |
| 464 | |
| 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; |
| 511 | char *dirname; |
| 512 | |
| 513 | tdesc_str = fetch_xml_from_file (filename, NULL); |
| 514 | if (tdesc_str == NULL) |
| 515 | { |
| 516 | warning (_("Could not open \"%s\""), filename); |
| 517 | return NULL; |
| 518 | } |
| 519 | |
| 520 | back_to = make_cleanup (xfree, tdesc_str); |
| 521 | |
| 522 | dirname = ldirname (filename); |
| 523 | if (dirname != NULL) |
| 524 | make_cleanup (xfree, dirname); |
| 525 | |
| 526 | tdesc = tdesc_parse_xml (tdesc_str, fetch_xml_from_file, dirname); |
| 527 | do_cleanups (back_to); |
| 528 | |
| 529 | return tdesc; |
| 530 | } |
| 531 | |
| 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 | |
| 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 | |
| 562 | tdesc_str = fetch_available_features_from_target ("target.xml", ops); |
| 563 | if (tdesc_str == NULL) |
| 564 | return NULL; |
| 565 | |
| 566 | back_to = make_cleanup (xfree, tdesc_str); |
| 567 | tdesc = tdesc_parse_xml (tdesc_str, |
| 568 | fetch_available_features_from_target, |
| 569 | ops); |
| 570 | do_cleanups (back_to); |
| 571 | |
| 572 | return tdesc; |
| 573 | } |