1 /* XML target description support for GDB.
4 Free Software Foundation, Inc.
6 Contributed by CodeSourcery.
8 This file is part of GDB.
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 3 of the License, or
13 (at your option) any later version.
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.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "target-descriptions.h"
27 #include "xml-support.h"
28 #include "xml-tdesc.h"
30 #include "filenames.h"
32 #include "gdb_assert.h"
34 #if !defined(HAVE_LIBEXPAT)
36 /* Parse DOCUMENT into a target description. Or don't, since we don't have
39 static struct target_desc *
40 tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
43 static int have_warned;
48 warning (_("Can not parse XML target description; XML support was "
49 "disabled at compile time"));
55 #else /* HAVE_LIBEXPAT */
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. */
65 struct tdesc_xml_cache
67 const char *xml_document;
68 struct target_desc *tdesc;
70 typedef struct tdesc_xml_cache tdesc_xml_cache_s;
71 DEF_VEC_O(tdesc_xml_cache_s);
73 static VEC(tdesc_xml_cache_s) *xml_cache;
75 /* Callback data for target description parsing. */
77 struct tdesc_parsing_data
79 /* The target description we are building. */
80 struct target_desc *tdesc;
82 /* The target feature we are currently parsing, or last parsed. */
83 struct tdesc_feature *current_feature;
85 /* The register number to use for the next register we see, if
86 it does not have its own. This starts at zero. */
89 /* The union we are currently parsing, or last parsed. */
90 struct type *current_union;
93 /* Handle the end of an <architecture> element and its value. */
96 tdesc_end_arch (struct gdb_xml_parser *parser,
97 const struct gdb_xml_element *element,
98 void *user_data, const char *body_text)
100 struct tdesc_parsing_data *data = user_data;
101 const struct bfd_arch_info *arch;
103 arch = bfd_scan_arch (body_text);
105 gdb_xml_error (parser, _("Target description specified unknown "
106 "architecture \"%s\""), body_text);
107 set_tdesc_architecture (data->tdesc, arch);
110 /* Handle the start of a <target> element. */
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)
117 struct tdesc_parsing_data *data = user_data;
118 char *version = VEC_index (gdb_xml_value_s, attributes, 0)->value;
120 if (strcmp (version, "1.0") != 0)
121 gdb_xml_error (parser,
122 _("Target description has unsupported version \"%s\""),
126 /* Handle the start of a <feature> element. */
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)
133 struct tdesc_parsing_data *data = user_data;
134 char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value;
136 data->current_feature = tdesc_create_feature (data->tdesc, name);
139 /* Handle the start of a <reg> element. Fill in the optional
140 attributes and attach it to the containing feature. */
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)
147 struct tdesc_parsing_data *data = user_data;
148 struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
150 char *name, *group, *type;
151 int bitsize, regnum, save_restore;
153 length = VEC_length (gdb_xml_value_s, attributes);
155 name = attrs[ix++].value;
156 bitsize = * (ULONGEST *) attrs[ix++].value;
158 if (ix < length && strcmp (attrs[ix].name, "regnum") == 0)
159 regnum = * (ULONGEST *) attrs[ix++].value;
161 regnum = data->next_regnum;
163 if (ix < length && strcmp (attrs[ix].name, "type") == 0)
164 type = attrs[ix++].value;
168 if (ix < length && strcmp (attrs[ix].name, "group") == 0)
169 group = attrs[ix++].value;
173 if (ix < length && strcmp (attrs[ix].name, "save-restore") == 0)
174 save_restore = * (ULONGEST *) attrs[ix++].value;
178 if (strcmp (type, "int") != 0
179 && strcmp (type, "float") != 0
180 && strcmp (type, "code_ptr") != 0
181 && strcmp (type, "data_ptr") != 0
182 && tdesc_named_type (data->current_feature, type) == NULL)
183 gdb_xml_error (parser, _("Register \"%s\" has unknown type \"%s\""),
186 tdesc_create_reg (data->current_feature, name, regnum, save_restore, group,
189 data->next_regnum = regnum + 1;
192 /* Handle the start of a <union> element. Initialize the type and
193 record it with the current feature. */
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)
200 struct tdesc_parsing_data *data = user_data;
201 char *id = VEC_index (gdb_xml_value_s, attributes, 0)->value;
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;
210 /* Handle the end of a <union> element. */
213 tdesc_end_union (struct gdb_xml_parser *parser,
214 const struct gdb_xml_element *element,
215 void *user_data, const char *body_text)
217 struct tdesc_parsing_data *data = user_data;
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)))
226 TYPE_FLAGS (data->current_union) |= TYPE_FLAG_VECTOR;
231 /* Handle the start of a <field> element. Attach the field to the
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)
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;
244 field_name = attrs[0].value;
245 field_type_id = attrs[1].value;
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 "
251 field_name, field_type_id);
253 append_composite_type_field (data->current_union, xstrdup (field_name),
257 /* Handle the start of a <vector> element. Initialize the type and
258 record it with the current feature. */
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)
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;
272 field_type_id = attrs[1].value;
273 count = * (ULONGEST *) attrs[2].value;
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\""),
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);
285 TYPE_FLAGS (type) |= TYPE_FLAG_VECTOR;
287 tdesc_record_type (data->current_feature, type);
290 /* The elements and attributes of an XML target description. */
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
350 static const struct gdb_xml_element target_children[] = {
351 { "architecture", NULL, NULL, GDB_XML_EF_OPTIONAL,
352 NULL, tdesc_end_arch },
353 { "feature", feature_attributes, feature_children,
354 GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
355 tdesc_start_feature, NULL },
356 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
359 static const struct gdb_xml_element tdesc_elements[] = {
360 { "target", target_attributes, target_children, GDB_XML_EF_NONE,
361 tdesc_start_target, NULL },
362 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
365 /* Parse DOCUMENT into a target description and return it. */
367 static struct target_desc *
368 tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
371 struct cleanup *back_to, *result_cleanup;
372 struct gdb_xml_parser *parser;
373 struct tdesc_parsing_data data;
374 struct tdesc_xml_cache *cache;
378 /* Expand all XInclude directives. */
379 expanded_text = xml_process_xincludes (_("target description"),
380 document, fetcher, fetcher_baton, 0);
381 if (expanded_text == NULL)
383 warning (_("Could not load XML target description; ignoring"));
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)
393 xfree (expanded_text);
397 back_to = make_cleanup (null_cleanup, NULL);
398 parser = gdb_xml_create_parser_and_cleanup (_("target description"),
399 tdesc_elements, &data);
400 gdb_xml_use_dtd (parser, "gdb-target.dtd");
402 memset (&data, 0, sizeof (struct tdesc_parsing_data));
403 data.tdesc = allocate_target_description ();
404 result_cleanup = make_cleanup_free_target_description (data.tdesc);
405 make_cleanup (xfree, expanded_text);
407 if (gdb_xml_parse (parser, expanded_text) == 0)
409 /* Parsed successfully. */
410 struct tdesc_xml_cache new_cache;
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);
415 discard_cleanups (result_cleanup);
416 do_cleanups (back_to);
421 warning (_("Could not load XML target description; ignoring"));
422 do_cleanups (back_to);
426 #endif /* HAVE_LIBEXPAT */
432 do_cleanup_fclose (void *file)
437 /* Open FILENAME, read all its text into memory, close it, and return
438 the text. If something goes wrong, return NULL and warn. */
441 fetch_xml_from_file (const char *filename, void *baton)
443 const char *dirname = baton;
445 struct cleanup *back_to;
449 if (dirname && *dirname)
451 char *fullname = concat (dirname, "/", filename, NULL);
452 if (fullname == NULL)
454 file = fopen (fullname, FOPEN_RT);
458 file = fopen (filename, FOPEN_RT);
463 back_to = make_cleanup (do_cleanup_fclose, file);
465 /* Read in the whole file, one chunk at a time. */
468 text = xmalloc (len);
469 make_cleanup (free_current_contents, &text);
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);
479 warning (_("Read error from \"%s\""), filename);
480 do_cleanups (back_to);
484 offset += bytes_read;
490 text = xrealloc (text, len);
494 discard_cleanups (back_to);
500 /* Read an XML target description from FILENAME. Parse it, and return
501 the parsed description. */
503 const struct target_desc *
504 file_read_description_xml (const char *filename)
506 struct target_desc *tdesc;
508 struct cleanup *back_to;
511 tdesc_str = fetch_xml_from_file (filename, NULL);
512 if (tdesc_str == NULL)
514 warning (_("Could not open \"%s\""), filename);
518 back_to = make_cleanup (xfree, tdesc_str);
520 dirname = ldirname (filename);
522 make_cleanup (xfree, dirname);
524 tdesc = tdesc_parse_xml (tdesc_str, fetch_xml_from_file, dirname);
525 do_cleanups (back_to);
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
538 fetch_available_features_from_target (const char *name, void *baton_)
540 struct target_ops *ops = baton_;
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,
550 /* Read an XML target description using OPS. Parse it, and return the
551 parsed description. */
553 const struct target_desc *
554 target_read_description_xml (struct target_ops *ops)
556 struct target_desc *tdesc;
558 struct cleanup *back_to;
560 tdesc_str = fetch_available_features_from_target ("target.xml", ops);
561 if (tdesc_str == NULL)
564 back_to = make_cleanup (xfree, tdesc_str);
565 tdesc = tdesc_parse_xml (tdesc_str,
566 fetch_available_features_from_target,
568 do_cleanups (back_to);