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/* XML target description support for GDB.
Copyright (C) 2006
Free Software Foundation, Inc.
Contributed by CodeSourcery.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "target.h"
#include "target-descriptions.h"
#include "xml-support.h"
#include "xml-tdesc.h"
#include "gdb_assert.h"
#if !defined(HAVE_LIBEXPAT)
/* Parse DOCUMENT into a target description. Or don't, since we don't have
an XML parser. */
static struct target_desc *
tdesc_parse_xml (const char *document)
{
static int have_warned;
if (!have_warned)
{
have_warned = 1;
warning (_("Can not parse XML target description; XML support was "
"disabled at compile time"));
}
return NULL;
}
#else /* HAVE_LIBEXPAT */
/* Callback data for target description parsing. */
struct tdesc_parsing_data
{
/* The target description we are building. */
struct target_desc *tdesc;
};
/* Handle the end of an <architecture> element and its value. */
static void
tdesc_end_arch (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, const char *body_text)
{
struct tdesc_parsing_data *data = user_data;
const struct bfd_arch_info *arch;
arch = bfd_scan_arch (body_text);
if (arch == NULL)
gdb_xml_error (parser, _("Target description specified unknown "
"architecture \"%s\""), body_text);
set_tdesc_architecture (data->tdesc, arch);
}
/* The elements and attributes of an XML target description. */
const struct gdb_xml_element target_children[] = {
{ "architecture", NULL, NULL, GDB_XML_EF_OPTIONAL,
NULL, tdesc_end_arch },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
const struct gdb_xml_element tdesc_elements[] = {
{ "target", NULL, target_children, GDB_XML_EF_NONE,
NULL, NULL },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
/* Parse DOCUMENT into a target description and return it. */
static struct target_desc *
tdesc_parse_xml (const char *document)
{
struct cleanup *back_to, *result_cleanup;
struct gdb_xml_parser *parser;
struct tdesc_parsing_data data;
memset (&data, 0, sizeof (struct tdesc_parsing_data));
back_to = make_cleanup (null_cleanup, NULL);
parser = gdb_xml_create_parser_and_cleanup (_("target description"),
tdesc_elements, &data);
data.tdesc = allocate_target_description ();
result_cleanup = make_cleanup_free_target_description (data.tdesc);
if (gdb_xml_parse (parser, document) == 0)
{
/* Parsed successfully. */
discard_cleanups (result_cleanup);
do_cleanups (back_to);
return data.tdesc;
}
else
{
warning (_("Could not load XML target description; ignoring"));
do_cleanups (back_to);
return NULL;
}
}
#endif /* HAVE_LIBEXPAT */
/* Close FILE. */
static void
do_cleanup_fclose (void *file)
{
fclose (file);
}
/* Open FILENAME, read all its text into memory, close it, and return
the text. If something goes wrong, return NULL and warn. */
static char *
fetch_xml_from_file (const char *filename)
{
FILE *file;
struct cleanup *back_to;
char *text;
size_t len, offset;
file = fopen (filename, FOPEN_RT);
if (file == NULL)
{
warning (_("Could not open \"%s\""), filename);
return NULL;
}
back_to = make_cleanup (do_cleanup_fclose, file);
/* Read in the whole file, one chunk at a time. */
len = 4096;
offset = 0;
text = xmalloc (len);
make_cleanup (free_current_contents, &text);
while (1)
{
size_t bytes_read;
/* Continue reading where the last read left off. Leave at least
one byte so that we can NUL-terminate the result. */
bytes_read = fread (text + offset, 1, len - offset - 1, file);
if (ferror (file))
{
warning (_("Read error from \"%s\""), filename);
do_cleanups (back_to);
return NULL;
}
offset += bytes_read;
if (feof (file))
break;
len = len * 2;
text = xrealloc (text, len);
}
fclose (file);
discard_cleanups (back_to);
text[offset] = '\0';
return text;
}
/* Read an XML target description from FILENAME. Parse it, and return
the parsed description. */
const struct target_desc *
file_read_description_xml (const char *filename)
{
struct target_desc *tdesc;
char *tdesc_str;
struct cleanup *back_to;
tdesc_str = fetch_xml_from_file (filename);
if (tdesc_str == NULL)
return NULL;
back_to = make_cleanup (xfree, tdesc_str);
tdesc = tdesc_parse_xml (tdesc_str);
do_cleanups (back_to);
return tdesc;
}
/* Read an XML target description using OPS. Parse it, and return the
parsed description. */
const struct target_desc *
target_read_description_xml (struct target_ops *ops)
{
struct target_desc *tdesc;
char *tdesc_str;
struct cleanup *back_to;
tdesc_str = target_read_stralloc (ops, TARGET_OBJECT_AVAILABLE_FEATURES,
"target.xml");
if (tdesc_str == NULL)
return NULL;
back_to = make_cleanup (xfree, tdesc_str);
tdesc = tdesc_parse_xml (tdesc_str);
do_cleanups (back_to);
return tdesc;
}
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