binutils-gdb/gdb/xml-tdesc.c

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/* XML target description support for GDB.
Copyright (C) 2006, 2008, 2009 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbtypes.h"
#include "target.h"
#include "target-descriptions.h"
#include "xml-support.h"
#include "xml-tdesc.h"
#include "filenames.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, xml_fetch_another fetcher,
void *fetcher_baton)
{
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 */
/* A record of every XML description we have parsed. We never discard
old descriptions, because we never discard gdbarches. As long as we
have a gdbarch referencing this description, we want to have a copy
of it here, so that if we parse the same XML document again we can
return the same "struct target_desc *"; if they are not singletons,
then we will create unnecessary duplicate gdbarches. See
gdbarch_list_lookup_by_info. */
struct tdesc_xml_cache
{
const char *xml_document;
struct target_desc *tdesc;
};
typedef struct tdesc_xml_cache tdesc_xml_cache_s;
DEF_VEC_O(tdesc_xml_cache_s);
static VEC(tdesc_xml_cache_s) *xml_cache;
/* Callback data for target description parsing. */
struct tdesc_parsing_data
{
/* The target description we are building. */
struct target_desc *tdesc;
/* The target feature we are currently parsing, or last parsed. */
struct tdesc_feature *current_feature;
/* The register number to use for the next register we see, if
it does not have its own. This starts at zero. */
int next_regnum;
/* The union we are currently parsing, or last parsed. */
struct type *current_union;
};
/* 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);
}
/* Handle the start of a <target> element. */
static void
tdesc_start_target (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, VEC(gdb_xml_value_s) *attributes)
{
struct tdesc_parsing_data *data = user_data;
char *version = VEC_index (gdb_xml_value_s, attributes, 0)->value;
if (strcmp (version, "1.0") != 0)
gdb_xml_error (parser,
_("Target description has unsupported version \"%s\""),
version);
}
/* Handle the start of a <feature> element. */
static void
tdesc_start_feature (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, VEC(gdb_xml_value_s) *attributes)
{
struct tdesc_parsing_data *data = user_data;
char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value;
data->current_feature = tdesc_create_feature (data->tdesc, name);
}
/* Handle the start of a <reg> element. Fill in the optional
attributes and attach it to the containing feature. */
static void
tdesc_start_reg (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, VEC(gdb_xml_value_s) *attributes)
{
struct tdesc_parsing_data *data = user_data;
struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
int ix = 0, length;
char *name, *group, *type;
int bitsize, regnum, save_restore;
length = VEC_length (gdb_xml_value_s, attributes);
name = attrs[ix++].value;
bitsize = * (ULONGEST *) attrs[ix++].value;
if (ix < length && strcmp (attrs[ix].name, "regnum") == 0)
regnum = * (ULONGEST *) attrs[ix++].value;
else
regnum = data->next_regnum;
if (ix < length && strcmp (attrs[ix].name, "type") == 0)
type = attrs[ix++].value;
else
type = "int";
if (ix < length && strcmp (attrs[ix].name, "group") == 0)
group = attrs[ix++].value;
else
group = NULL;
if (ix < length && strcmp (attrs[ix].name, "save-restore") == 0)
save_restore = * (ULONGEST *) attrs[ix++].value;
else
save_restore = 1;
if (strcmp (type, "int") != 0
&& strcmp (type, "float") != 0
&& strcmp (type, "code_ptr") != 0
&& strcmp (type, "data_ptr") != 0
&& tdesc_named_type (data->current_feature, type) == NULL)
gdb_xml_error (parser, _("Register \"%s\" has unknown type \"%s\""),
name, type);
tdesc_create_reg (data->current_feature, name, regnum, save_restore, group,
bitsize, type);
data->next_regnum = regnum + 1;
}
/* Handle the start of a <union> element. Initialize the type and
record it with the current feature. */
static void
tdesc_start_union (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, VEC(gdb_xml_value_s) *attributes)
{
struct tdesc_parsing_data *data = user_data;
char *id = VEC_index (gdb_xml_value_s, attributes, 0)->value;
struct type *type;
type = init_composite_type (NULL, TYPE_CODE_UNION);
TYPE_NAME (type) = xstrdup (id);
tdesc_record_type (data->current_feature, type);
data->current_union = type;
}
/* Handle the end of a <union> element. */
static void
tdesc_end_union (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;
int i;
/* If any of the children of this union are vectors, flag the union
as a vector also. This allows e.g. a union of two vector types
to show up automatically in "info vector". */
for (i = 0; i < TYPE_NFIELDS (data->current_union); i++)
if (TYPE_VECTOR (TYPE_FIELD_TYPE (data->current_union, i)))
{
TYPE_VECTOR (data->current_union) = 1;
break;
}
}
/* Handle the start of a <field> element. Attach the field to the
current union. */
static void
tdesc_start_field (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, VEC(gdb_xml_value_s) *attributes)
{
struct tdesc_parsing_data *data = user_data;
struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
struct type *type, *field_type;
char *field_name, *field_type_id;
field_name = attrs[0].value;
field_type_id = attrs[1].value;
field_type = tdesc_named_type (data->current_feature, field_type_id);
if (field_type == NULL)
gdb_xml_error (parser, _("Union field \"%s\" references undefined "
"type \"%s\""),
field_name, field_type_id);
append_composite_type_field (data->current_union, xstrdup (field_name),
field_type);
}
/* Handle the start of a <vector> element. Initialize the type and
record it with the current feature. */
static void
tdesc_start_vector (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, VEC(gdb_xml_value_s) *attributes)
{
struct tdesc_parsing_data *data = user_data;
struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
struct type *type, *field_type, *range_type;
char *id, *field_type_id;
int count;
id = attrs[0].value;
field_type_id = attrs[1].value;
count = * (ULONGEST *) attrs[2].value;
field_type = tdesc_named_type (data->current_feature, field_type_id);
if (field_type == NULL)
gdb_xml_error (parser, _("Vector \"%s\" references undefined type \"%s\""),
id, field_type_id);
type = init_vector_type (field_type, count);
TYPE_NAME (type) = xstrdup (id);
tdesc_record_type (data->current_feature, type);
}
/* The elements and attributes of an XML target description. */
static const struct gdb_xml_attribute field_attributes[] = {
{ "name", GDB_XML_AF_NONE, NULL, NULL },
{ "type", GDB_XML_AF_NONE, NULL, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_element union_children[] = {
{ "field", field_attributes, NULL, GDB_XML_EF_REPEATABLE,
tdesc_start_field, NULL },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
static const struct gdb_xml_attribute reg_attributes[] = {
{ "name", GDB_XML_AF_NONE, NULL, NULL },
{ "bitsize", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
{ "regnum", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL },
{ "type", GDB_XML_AF_OPTIONAL, NULL, NULL },
{ "group", GDB_XML_AF_OPTIONAL, NULL, NULL },
{ "save-restore", GDB_XML_AF_OPTIONAL,
gdb_xml_parse_attr_enum, gdb_xml_enums_boolean },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_attribute union_attributes[] = {
{ "id", GDB_XML_AF_NONE, NULL, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_attribute vector_attributes[] = {
{ "id", GDB_XML_AF_NONE, NULL, NULL },
{ "type", GDB_XML_AF_NONE, NULL, NULL },
{ "count", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_attribute feature_attributes[] = {
{ "name", GDB_XML_AF_NONE, NULL, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_element feature_children[] = {
{ "reg", reg_attributes, NULL,
GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
tdesc_start_reg, NULL },
{ "union", union_attributes, union_children,
GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
tdesc_start_union, tdesc_end_union },
{ "vector", vector_attributes, NULL,
GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
tdesc_start_vector, NULL },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
static const struct gdb_xml_attribute target_attributes[] = {
{ "version", GDB_XML_AF_NONE, NULL, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_element target_children[] = {
{ "architecture", NULL, NULL, GDB_XML_EF_OPTIONAL,
NULL, tdesc_end_arch },
{ "feature", feature_attributes, feature_children,
GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
tdesc_start_feature, NULL },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
static const struct gdb_xml_element tdesc_elements[] = {
{ "target", target_attributes, target_children, GDB_XML_EF_NONE,
tdesc_start_target, 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, xml_fetch_another fetcher,
void *fetcher_baton)
{
struct cleanup *back_to, *result_cleanup;
struct gdb_xml_parser *parser;
struct tdesc_parsing_data data;
struct tdesc_xml_cache *cache;
char *expanded_text;
int ix;
/* Expand all XInclude directives. */
expanded_text = xml_process_xincludes (_("target description"),
document, fetcher, fetcher_baton, 0);
if (expanded_text == NULL)
{
warning (_("Could not load XML target description; ignoring"));
return NULL;
}
/* Check for an exact match in the list of descriptions we have
previously parsed. strcmp is a slightly inefficient way to
do this; an SHA-1 checksum would work as well. */
for (ix = 0; VEC_iterate (tdesc_xml_cache_s, xml_cache, ix, cache); ix++)
if (strcmp (cache->xml_document, expanded_text) == 0)
{
xfree (expanded_text);
return cache->tdesc;
}
back_to = make_cleanup (null_cleanup, NULL);
parser = gdb_xml_create_parser_and_cleanup (_("target description"),
tdesc_elements, &data);
gdb_xml_use_dtd (parser, "gdb-target.dtd");
memset (&data, 0, sizeof (struct tdesc_parsing_data));
data.tdesc = allocate_target_description ();
result_cleanup = make_cleanup_free_target_description (data.tdesc);
make_cleanup (xfree, expanded_text);
if (gdb_xml_parse (parser, expanded_text) == 0)
{
/* Parsed successfully. */
struct tdesc_xml_cache new_cache;
new_cache.xml_document = expanded_text;
new_cache.tdesc = data.tdesc;
VEC_safe_push (tdesc_xml_cache_s, xml_cache, &new_cache);
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 */
/* 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, void *baton)
{
const char *dirname = baton;
FILE *file;
struct cleanup *back_to;
char *text;
size_t len, offset;
if (dirname && *dirname)
{
char *fullname = concat (dirname, "/", filename, (char *) NULL);
if (fullname == NULL)
nomem (0);
file = fopen (fullname, FOPEN_RT);
xfree (fullname);
}
else
file = fopen (filename, FOPEN_RT);
if (file == NULL)
return NULL;
back_to = make_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;
char *dirname;
tdesc_str = fetch_xml_from_file (filename, NULL);
if (tdesc_str == NULL)
{
warning (_("Could not open \"%s\""), filename);
return NULL;
}
back_to = make_cleanup (xfree, tdesc_str);
dirname = ldirname (filename);
if (dirname != NULL)
make_cleanup (xfree, dirname);
tdesc = tdesc_parse_xml (tdesc_str, fetch_xml_from_file, dirname);
do_cleanups (back_to);
return tdesc;
}
/* Read a string representation of available features from the target,
using TARGET_OBJECT_AVAILABLE_FEATURES. The returned string is
malloc allocated and NUL-terminated. NAME should be a non-NULL
string identifying the XML document we want; the top level document
is "target.xml". Other calls may be performed for the DTD or
for <xi:include>. */
static char *
fetch_available_features_from_target (const char *name, void *baton_)
{
struct target_ops *ops = baton_;
/* Read this object as a string. This ensures that a NUL
terminator is added. */
return target_read_stralloc (ops,
TARGET_OBJECT_AVAILABLE_FEATURES,
name);
}
/* 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 = fetch_available_features_from_target ("target.xml", ops);
if (tdesc_str == NULL)
return NULL;
back_to = make_cleanup (xfree, tdesc_str);
tdesc = tdesc_parse_xml (tdesc_str,
fetch_available_features_from_target,
ops);
do_cleanups (back_to);
return tdesc;
}