1 /* XML target description support for GDB.
3 Copyright (C) 2006, 2008, 2009 Free Software Foundation, Inc.
5 Contributed by CodeSourcery.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "target-descriptions.h"
25 #include "xml-support.h"
26 #include "xml-tdesc.h"
29 #include "filenames.h"
31 #include "gdb_assert.h"
33 #if !defined(HAVE_LIBEXPAT)
35 /* Parse DOCUMENT into a target description. Or don't, since we don't have
38 static struct target_desc *
39 tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
42 static int have_warned;
47 warning (_("Can not parse XML target description; XML support was "
48 "disabled at compile time"));
54 #else /* HAVE_LIBEXPAT */
56 /* A record of every XML description we have parsed. We never discard
57 old descriptions, because we never discard gdbarches. As long as we
58 have a gdbarch referencing this description, we want to have a copy
59 of it here, so that if we parse the same XML document again we can
60 return the same "struct target_desc *"; if they are not singletons,
61 then we will create unnecessary duplicate gdbarches. See
62 gdbarch_list_lookup_by_info. */
64 struct tdesc_xml_cache
66 const char *xml_document;
67 struct target_desc *tdesc;
69 typedef struct tdesc_xml_cache tdesc_xml_cache_s;
70 DEF_VEC_O(tdesc_xml_cache_s);
72 static VEC(tdesc_xml_cache_s) *xml_cache;
74 /* Callback data for target description parsing. */
76 struct tdesc_parsing_data
78 /* The target description we are building. */
79 struct target_desc *tdesc;
81 /* The target feature we are currently parsing, or last parsed. */
82 struct tdesc_feature *current_feature;
84 /* The register number to use for the next register we see, if
85 it does not have its own. This starts at zero. */
88 /* The union we are currently parsing, or last parsed. */
89 struct tdesc_type *current_union;
92 /* Handle the end of an <architecture> element and its value. */
95 tdesc_end_arch (struct gdb_xml_parser *parser,
96 const struct gdb_xml_element *element,
97 void *user_data, const char *body_text)
99 struct tdesc_parsing_data *data = user_data;
100 const struct bfd_arch_info *arch;
102 arch = bfd_scan_arch (body_text);
104 gdb_xml_error (parser, _("Target description specified unknown "
105 "architecture \"%s\""), body_text);
106 set_tdesc_architecture (data->tdesc, arch);
109 /* Handle the end of an <osabi> element and its value. */
112 tdesc_end_osabi (struct gdb_xml_parser *parser,
113 const struct gdb_xml_element *element,
114 void *user_data, const char *body_text)
116 struct tdesc_parsing_data *data = user_data;
117 enum gdb_osabi osabi;
119 osabi = osabi_from_tdesc_string (body_text);
120 if (osabi == GDB_OSABI_UNKNOWN)
121 warning (_("Target description specified unknown osabi \"%s\""),
124 set_tdesc_osabi (data->tdesc, osabi);
127 /* Handle the start of a <target> element. */
130 tdesc_start_target (struct gdb_xml_parser *parser,
131 const struct gdb_xml_element *element,
132 void *user_data, VEC(gdb_xml_value_s) *attributes)
134 struct tdesc_parsing_data *data = user_data;
135 char *version = VEC_index (gdb_xml_value_s, attributes, 0)->value;
137 if (strcmp (version, "1.0") != 0)
138 gdb_xml_error (parser,
139 _("Target description has unsupported version \"%s\""),
143 /* Handle the start of a <feature> element. */
146 tdesc_start_feature (struct gdb_xml_parser *parser,
147 const struct gdb_xml_element *element,
148 void *user_data, VEC(gdb_xml_value_s) *attributes)
150 struct tdesc_parsing_data *data = user_data;
151 char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value;
153 data->current_feature = tdesc_create_feature (data->tdesc, name);
156 /* Handle the start of a <reg> element. Fill in the optional
157 attributes and attach it to the containing feature. */
160 tdesc_start_reg (struct gdb_xml_parser *parser,
161 const struct gdb_xml_element *element,
162 void *user_data, VEC(gdb_xml_value_s) *attributes)
164 struct tdesc_parsing_data *data = user_data;
165 struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
167 char *name, *group, *type;
168 int bitsize, regnum, save_restore;
170 length = VEC_length (gdb_xml_value_s, attributes);
172 name = attrs[ix++].value;
173 bitsize = * (ULONGEST *) attrs[ix++].value;
175 if (ix < length && strcmp (attrs[ix].name, "regnum") == 0)
176 regnum = * (ULONGEST *) attrs[ix++].value;
178 regnum = data->next_regnum;
180 if (ix < length && strcmp (attrs[ix].name, "type") == 0)
181 type = attrs[ix++].value;
185 if (ix < length && strcmp (attrs[ix].name, "group") == 0)
186 group = attrs[ix++].value;
190 if (ix < length && strcmp (attrs[ix].name, "save-restore") == 0)
191 save_restore = * (ULONGEST *) attrs[ix++].value;
195 if (strcmp (type, "int") != 0
196 && strcmp (type, "float") != 0
197 && tdesc_named_type (data->current_feature, type) == NULL)
198 gdb_xml_error (parser, _("Register \"%s\" has unknown type \"%s\""),
201 tdesc_create_reg (data->current_feature, name, regnum, save_restore, group,
204 data->next_regnum = regnum + 1;
207 /* Handle the start of a <union> element. Initialize the type and
208 record it with the current feature. */
211 tdesc_start_union (struct gdb_xml_parser *parser,
212 const struct gdb_xml_element *element,
213 void *user_data, VEC(gdb_xml_value_s) *attributes)
215 struct tdesc_parsing_data *data = user_data;
216 char *id = VEC_index (gdb_xml_value_s, attributes, 0)->value;
218 data->current_union = tdesc_create_union (data->current_feature, id);
221 /* Handle the start of a <field> element. Attach the field to the
225 tdesc_start_field (struct gdb_xml_parser *parser,
226 const struct gdb_xml_element *element,
227 void *user_data, VEC(gdb_xml_value_s) *attributes)
229 struct tdesc_parsing_data *data = user_data;
230 struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
231 struct tdesc_type *field_type;
232 char *field_name, *field_type_id;
234 field_name = attrs[0].value;
235 field_type_id = attrs[1].value;
237 field_type = tdesc_named_type (data->current_feature, field_type_id);
238 if (field_type == NULL)
239 gdb_xml_error (parser, _("Union field \"%s\" references undefined "
241 field_name, field_type_id);
243 tdesc_add_field (data->current_union, field_name, field_type);
246 /* Handle the start of a <vector> element. Initialize the type and
247 record it with the current feature. */
250 tdesc_start_vector (struct gdb_xml_parser *parser,
251 const struct gdb_xml_element *element,
252 void *user_data, VEC(gdb_xml_value_s) *attributes)
254 struct tdesc_parsing_data *data = user_data;
255 struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
256 struct tdesc_type *field_type;
257 char *id, *field_type_id;
261 field_type_id = attrs[1].value;
262 count = * (ULONGEST *) attrs[2].value;
264 field_type = tdesc_named_type (data->current_feature, field_type_id);
265 if (field_type == NULL)
266 gdb_xml_error (parser, _("Vector \"%s\" references undefined type \"%s\""),
269 tdesc_create_vector (data->current_feature, id, field_type, count);
272 /* The elements and attributes of an XML target description. */
274 static const struct gdb_xml_attribute field_attributes[] = {
275 { "name", GDB_XML_AF_NONE, NULL, NULL },
276 { "type", GDB_XML_AF_NONE, NULL, NULL },
277 { NULL, GDB_XML_AF_NONE, NULL, NULL }
280 static const struct gdb_xml_element union_children[] = {
281 { "field", field_attributes, NULL, GDB_XML_EF_REPEATABLE,
282 tdesc_start_field, NULL },
283 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
286 static const struct gdb_xml_attribute reg_attributes[] = {
287 { "name", GDB_XML_AF_NONE, NULL, NULL },
288 { "bitsize", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
289 { "regnum", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL },
290 { "type", GDB_XML_AF_OPTIONAL, NULL, NULL },
291 { "group", GDB_XML_AF_OPTIONAL, NULL, NULL },
292 { "save-restore", GDB_XML_AF_OPTIONAL,
293 gdb_xml_parse_attr_enum, gdb_xml_enums_boolean },
294 { NULL, GDB_XML_AF_NONE, NULL, NULL }
297 static const struct gdb_xml_attribute union_attributes[] = {
298 { "id", GDB_XML_AF_NONE, NULL, NULL },
299 { NULL, GDB_XML_AF_NONE, NULL, NULL }
302 static const struct gdb_xml_attribute vector_attributes[] = {
303 { "id", GDB_XML_AF_NONE, NULL, NULL },
304 { "type", GDB_XML_AF_NONE, NULL, NULL },
305 { "count", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
306 { NULL, GDB_XML_AF_NONE, NULL, NULL }
309 static const struct gdb_xml_attribute feature_attributes[] = {
310 { "name", GDB_XML_AF_NONE, NULL, NULL },
311 { NULL, GDB_XML_AF_NONE, NULL, NULL }
314 static const struct gdb_xml_element feature_children[] = {
315 { "reg", reg_attributes, NULL,
316 GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
317 tdesc_start_reg, NULL },
318 { "union", union_attributes, union_children,
319 GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
320 tdesc_start_union, NULL },
321 { "vector", vector_attributes, NULL,
322 GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
323 tdesc_start_vector, NULL },
324 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
327 static const struct gdb_xml_attribute target_attributes[] = {
328 { "version", GDB_XML_AF_NONE, NULL, NULL },
329 { NULL, GDB_XML_AF_NONE, NULL, NULL }
332 static const struct gdb_xml_element target_children[] = {
333 { "architecture", NULL, NULL, GDB_XML_EF_OPTIONAL,
334 NULL, tdesc_end_arch },
335 { "osabi", NULL, NULL, GDB_XML_EF_OPTIONAL,
336 NULL, tdesc_end_osabi },
337 { "feature", feature_attributes, feature_children,
338 GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
339 tdesc_start_feature, NULL },
340 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
343 static const struct gdb_xml_element tdesc_elements[] = {
344 { "target", target_attributes, target_children, GDB_XML_EF_NONE,
345 tdesc_start_target, NULL },
346 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
349 /* Parse DOCUMENT into a target description and return it. */
351 static struct target_desc *
352 tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
355 struct cleanup *back_to, *result_cleanup;
356 struct gdb_xml_parser *parser;
357 struct tdesc_parsing_data data;
358 struct tdesc_xml_cache *cache;
362 /* Expand all XInclude directives. */
363 expanded_text = xml_process_xincludes (_("target description"),
364 document, fetcher, fetcher_baton, 0);
365 if (expanded_text == NULL)
367 warning (_("Could not load XML target description; ignoring"));
371 /* Check for an exact match in the list of descriptions we have
372 previously parsed. strcmp is a slightly inefficient way to
373 do this; an SHA-1 checksum would work as well. */
374 for (ix = 0; VEC_iterate (tdesc_xml_cache_s, xml_cache, ix, cache); ix++)
375 if (strcmp (cache->xml_document, expanded_text) == 0)
377 xfree (expanded_text);
381 back_to = make_cleanup (null_cleanup, NULL);
382 parser = gdb_xml_create_parser_and_cleanup (_("target description"),
383 tdesc_elements, &data);
384 gdb_xml_use_dtd (parser, "gdb-target.dtd");
386 memset (&data, 0, sizeof (struct tdesc_parsing_data));
387 data.tdesc = allocate_target_description ();
388 result_cleanup = make_cleanup_free_target_description (data.tdesc);
389 make_cleanup (xfree, expanded_text);
391 if (gdb_xml_parse (parser, expanded_text) == 0)
393 /* Parsed successfully. */
394 struct tdesc_xml_cache new_cache;
396 new_cache.xml_document = expanded_text;
397 new_cache.tdesc = data.tdesc;
398 VEC_safe_push (tdesc_xml_cache_s, xml_cache, &new_cache);
399 discard_cleanups (result_cleanup);
400 do_cleanups (back_to);
405 warning (_("Could not load XML target description; ignoring"));
406 do_cleanups (back_to);
410 #endif /* HAVE_LIBEXPAT */
413 /* Open FILENAME, read all its text into memory, close it, and return
414 the text. If something goes wrong, return NULL and warn. */
417 fetch_xml_from_file (const char *filename, void *baton)
419 const char *dirname = baton;
421 struct cleanup *back_to;
425 if (dirname && *dirname)
427 char *fullname = concat (dirname, "/", filename, (char *) NULL);
428 if (fullname == NULL)
430 file = fopen (fullname, FOPEN_RT);
434 file = fopen (filename, FOPEN_RT);
439 back_to = make_cleanup_fclose (file);
441 /* Read in the whole file, one chunk at a time. */
444 text = xmalloc (len);
445 make_cleanup (free_current_contents, &text);
450 /* Continue reading where the last read left off. Leave at least
451 one byte so that we can NUL-terminate the result. */
452 bytes_read = fread (text + offset, 1, len - offset - 1, file);
455 warning (_("Read error from \"%s\""), filename);
456 do_cleanups (back_to);
460 offset += bytes_read;
466 text = xrealloc (text, len);
470 discard_cleanups (back_to);
476 /* Read an XML target description from FILENAME. Parse it, and return
477 the parsed description. */
479 const struct target_desc *
480 file_read_description_xml (const char *filename)
482 struct target_desc *tdesc;
484 struct cleanup *back_to;
487 tdesc_str = fetch_xml_from_file (filename, NULL);
488 if (tdesc_str == NULL)
490 warning (_("Could not open \"%s\""), filename);
494 back_to = make_cleanup (xfree, tdesc_str);
496 dirname = ldirname (filename);
498 make_cleanup (xfree, dirname);
500 tdesc = tdesc_parse_xml (tdesc_str, fetch_xml_from_file, dirname);
501 do_cleanups (back_to);
506 /* Read a string representation of available features from the target,
507 using TARGET_OBJECT_AVAILABLE_FEATURES. The returned string is
508 malloc allocated and NUL-terminated. NAME should be a non-NULL
509 string identifying the XML document we want; the top level document
510 is "target.xml". Other calls may be performed for the DTD or
514 fetch_available_features_from_target (const char *name, void *baton_)
516 struct target_ops *ops = baton_;
518 /* Read this object as a string. This ensures that a NUL
519 terminator is added. */
520 return target_read_stralloc (ops,
521 TARGET_OBJECT_AVAILABLE_FEATURES,
526 /* Read an XML target description using OPS. Parse it, and return the
527 parsed description. */
529 const struct target_desc *
530 target_read_description_xml (struct target_ops *ops)
532 struct target_desc *tdesc;
534 struct cleanup *back_to;
536 tdesc_str = fetch_available_features_from_target ("target.xml", ops);
537 if (tdesc_str == NULL)
540 back_to = make_cleanup (xfree, tdesc_str);
541 tdesc = tdesc_parse_xml (tdesc_str,
542 fetch_available_features_from_target,
544 do_cleanups (back_to);