341 lines
9.1 KiB
C
341 lines
9.1 KiB
C
/* XML target description support for GDB.
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Copyright (C) 2006
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Free Software Foundation, Inc.
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Contributed by CodeSourcery.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "target.h"
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#include "target-descriptions.h"
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#include "xml-support.h"
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#include "xml-tdesc.h"
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#include "filenames.h"
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#include "gdb_assert.h"
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#if !defined(HAVE_LIBEXPAT)
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/* Parse DOCUMENT into a target description. Or don't, since we don't have
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an XML parser. */
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static struct target_desc *
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tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
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void *fetcher_baton)
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{
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static int have_warned;
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if (!have_warned)
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{
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have_warned = 1;
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warning (_("Can not parse XML target description; XML support was "
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"disabled at compile time"));
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}
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return NULL;
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}
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#else /* HAVE_LIBEXPAT */
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/* A record of every XML description we have parsed. We never discard
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old descriptions, because we never discard gdbarches. As long as we
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have a gdbarch referencing this description, we want to have a copy
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of it here, so that if we parse the same XML document again we can
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return the same "struct target_desc *"; if they are not singletons,
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then we will create unnecessary duplicate gdbarches. See
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gdbarch_list_lookup_by_info. */
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struct tdesc_xml_cache
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{
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const char *xml_document;
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struct target_desc *tdesc;
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};
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typedef struct tdesc_xml_cache tdesc_xml_cache_s;
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DEF_VEC_O(tdesc_xml_cache_s);
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static VEC(tdesc_xml_cache_s) *xml_cache;
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/* Callback data for target description parsing. */
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struct tdesc_parsing_data
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{
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/* The target description we are building. */
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struct target_desc *tdesc;
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};
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/* Handle the end of an <architecture> element and its value. */
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static void
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tdesc_end_arch (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, const char *body_text)
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{
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struct tdesc_parsing_data *data = user_data;
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const struct bfd_arch_info *arch;
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arch = bfd_scan_arch (body_text);
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if (arch == NULL)
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gdb_xml_error (parser, _("Target description specified unknown "
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"architecture \"%s\""), body_text);
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set_tdesc_architecture (data->tdesc, arch);
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}
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/* The elements and attributes of an XML target description. */
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const struct gdb_xml_element target_children[] = {
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{ "architecture", NULL, NULL, GDB_XML_EF_OPTIONAL,
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NULL, tdesc_end_arch },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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const struct gdb_xml_element tdesc_elements[] = {
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{ "target", NULL, target_children, GDB_XML_EF_NONE,
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NULL, NULL },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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/* Parse DOCUMENT into a target description and return it. */
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static struct target_desc *
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tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
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void *fetcher_baton)
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{
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struct cleanup *back_to, *result_cleanup;
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struct gdb_xml_parser *parser;
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struct tdesc_parsing_data data;
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struct tdesc_xml_cache *cache;
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char *expanded_text;
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int ix;
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/* Expand all XInclude directives. */
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expanded_text = xml_process_xincludes (_("target description"),
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document, fetcher, fetcher_baton, 0);
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if (expanded_text == NULL)
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{
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warning (_("Could not load XML target description; ignoring"));
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return NULL;
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}
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/* Check for an exact match in the list of descriptions we have
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previously parsed. strcmp is a slightly inefficient way to
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do this; an SHA-1 checksum would work as well. */
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for (ix = 0; VEC_iterate (tdesc_xml_cache_s, xml_cache, ix, cache); ix++)
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if (strcmp (cache->xml_document, expanded_text) == 0)
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{
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xfree (expanded_text);
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return cache->tdesc;
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}
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back_to = make_cleanup (null_cleanup, NULL);
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parser = gdb_xml_create_parser_and_cleanup (_("target description"),
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tdesc_elements, &data);
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gdb_xml_use_dtd (parser, "gdb-target.dtd");
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memset (&data, 0, sizeof (struct tdesc_parsing_data));
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data.tdesc = allocate_target_description ();
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result_cleanup = make_cleanup_free_target_description (data.tdesc);
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make_cleanup (xfree, expanded_text);
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if (gdb_xml_parse (parser, expanded_text) == 0)
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{
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/* Parsed successfully. */
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struct tdesc_xml_cache new_cache;
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new_cache.xml_document = expanded_text;
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new_cache.tdesc = data.tdesc;
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VEC_safe_push (tdesc_xml_cache_s, xml_cache, &new_cache);
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discard_cleanups (result_cleanup);
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do_cleanups (back_to);
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return data.tdesc;
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}
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else
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{
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warning (_("Could not load XML target description; ignoring"));
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do_cleanups (back_to);
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return NULL;
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}
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}
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#endif /* HAVE_LIBEXPAT */
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/* Close FILE. */
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static void
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do_cleanup_fclose (void *file)
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{
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fclose (file);
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}
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/* Open FILENAME, read all its text into memory, close it, and return
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the text. If something goes wrong, return NULL and warn. */
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static char *
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fetch_xml_from_file (const char *filename, void *baton)
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{
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const char *dirname = baton;
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FILE *file;
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struct cleanup *back_to;
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char *text;
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size_t len, offset;
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if (dirname && *dirname)
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{
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char *fullname = concat (dirname, "/", filename, NULL);
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if (fullname == NULL)
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nomem (0);
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file = fopen (fullname, FOPEN_RT);
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xfree (fullname);
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}
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else
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file = fopen (filename, FOPEN_RT);
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if (file == NULL)
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return NULL;
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back_to = make_cleanup (do_cleanup_fclose, file);
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/* Read in the whole file, one chunk at a time. */
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len = 4096;
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offset = 0;
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text = xmalloc (len);
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make_cleanup (free_current_contents, &text);
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while (1)
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{
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size_t bytes_read;
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/* Continue reading where the last read left off. Leave at least
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one byte so that we can NUL-terminate the result. */
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bytes_read = fread (text + offset, 1, len - offset - 1, file);
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if (ferror (file))
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{
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warning (_("Read error from \"%s\""), filename);
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do_cleanups (back_to);
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return NULL;
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}
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offset += bytes_read;
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if (feof (file))
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break;
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len = len * 2;
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text = xrealloc (text, len);
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}
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fclose (file);
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discard_cleanups (back_to);
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text[offset] = '\0';
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return text;
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}
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/* Read an XML target description from FILENAME. Parse it, and return
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the parsed description. */
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const struct target_desc *
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file_read_description_xml (const char *filename)
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{
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struct target_desc *tdesc;
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char *tdesc_str;
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struct cleanup *back_to;
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const char *base;
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char *dirname;
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tdesc_str = fetch_xml_from_file (filename, NULL);
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if (tdesc_str == NULL)
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{
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warning (_("Could not open \"%s\""), filename);
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return NULL;
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}
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back_to = make_cleanup (xfree, tdesc_str);
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/* Simple, portable version of dirname that does not modify its
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argument. */
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base = lbasename (filename);
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while (base > filename && IS_DIR_SEPARATOR (base[-1]))
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--base;
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if (base > filename)
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{
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dirname = xmalloc (base - filename + 2);
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memcpy (dirname, filename, base - filename);
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/* On DOS based file systems, convert "d:foo" to "d:.", so that
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we create "d:./bar" later instead of the (different)
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"d:/bar". */
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if (base - filename == 2 && IS_ABSOLUTE_PATH (base)
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&& !IS_DIR_SEPARATOR (filename[0]))
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dirname[base++ - filename] = '.';
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dirname[base - filename] = '\0';
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make_cleanup (xfree, dirname);
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}
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else
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dirname = NULL;
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tdesc = tdesc_parse_xml (tdesc_str, fetch_xml_from_file, dirname);
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do_cleanups (back_to);
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return tdesc;
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}
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/* Read a string representation of available features from the target,
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using TARGET_OBJECT_AVAILABLE_FEATURES. The returned string is
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malloc allocated and NUL-terminated. NAME should be a non-NULL
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string identifying the XML document we want; the top level document
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is "target.xml". Other calls may be performed for the DTD or
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for <xi:include>. */
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static char *
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fetch_available_features_from_target (const char *name, void *baton_)
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{
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struct target_ops *ops = baton_;
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/* Read this object as a string. This ensures that a NUL
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terminator is added. */
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return target_read_stralloc (ops,
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TARGET_OBJECT_AVAILABLE_FEATURES,
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name);
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}
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/* Read an XML target description using OPS. Parse it, and return the
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parsed description. */
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const struct target_desc *
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target_read_description_xml (struct target_ops *ops)
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{
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struct target_desc *tdesc;
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char *tdesc_str;
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struct cleanup *back_to;
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tdesc_str = fetch_available_features_from_target ("target.xml", ops);
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if (tdesc_str == NULL)
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return NULL;
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back_to = make_cleanup (xfree, tdesc_str);
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tdesc = tdesc_parse_xml (tdesc_str,
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fetch_available_features_from_target,
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ops);
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do_cleanups (back_to);
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return tdesc;
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}
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