mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-02 06:43:58 +08:00
c6913b7d1e
* xml-support.c (xinclude_start_include): Delete unused variable. (xml_process_xincludes): Delete unused variable. * xml-syscall.c (syscall_parse_xml): Delete unused variable. * target-descriptions.c (tdesc_gdb_type): Delete unused variable. (tdesc_find_arch_register): Delete unused variable. (tdesc_use_registers): Delete unused variable. * xml-tdesc.c (tdesc_start_target): Delete unused variable. * inferior.c (print_inferior): Delete unused variable. * record.c (record_open_1): Delete unused variable. (record_restore): Delete unused variable. (cmd_record_save): Delete unused variable. * gcore.c (derive_heap_segment): Delete unused variable. (objfile_find_memory_regions): Use unused variable. * jit.c (jit_inferior_init): Delete unused variable. * progspace.c (clone_program_space): Delete unused variable. (pspace_empty_p): Delete unused variable.
1110 lines
29 KiB
C
1110 lines
29 KiB
C
/* Helper routines for parsing XML using Expat.
|
||
|
||
Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
|
||
|
||
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 "gdbcmd.h"
|
||
#include "exceptions.h"
|
||
#include "xml-support.h"
|
||
|
||
#include "gdb_string.h"
|
||
#include "safe-ctype.h"
|
||
|
||
/* Debugging flag. */
|
||
static int debug_xml;
|
||
|
||
/* The contents of this file are only useful if XML support is
|
||
available. */
|
||
#ifdef HAVE_LIBEXPAT
|
||
|
||
#include "gdb_expat.h"
|
||
|
||
/* The maximum depth of <xi:include> nesting. No need to be miserly,
|
||
we just want to avoid running out of stack on loops. */
|
||
#define MAX_XINCLUDE_DEPTH 30
|
||
|
||
/* Simplified XML parser infrastructure. */
|
||
|
||
/* A parsing level -- used to keep track of the current element
|
||
nesting. */
|
||
struct scope_level
|
||
{
|
||
/* Elements we allow at this level. */
|
||
const struct gdb_xml_element *elements;
|
||
|
||
/* The element which we are within. */
|
||
const struct gdb_xml_element *element;
|
||
|
||
/* Mask of which elements we've seen at this level (used for
|
||
optional and repeatable checking). */
|
||
unsigned int seen;
|
||
|
||
/* Body text accumulation. */
|
||
struct obstack *body;
|
||
};
|
||
typedef struct scope_level scope_level_s;
|
||
DEF_VEC_O(scope_level_s);
|
||
|
||
/* The parser itself, and our additional state. */
|
||
struct gdb_xml_parser
|
||
{
|
||
XML_Parser expat_parser; /* The underlying expat parser. */
|
||
|
||
const char *name; /* Name of this parser. */
|
||
void *user_data; /* The user's callback data, for handlers. */
|
||
|
||
VEC(scope_level_s) *scopes; /* Scoping stack. */
|
||
|
||
struct gdb_exception error; /* A thrown error, if any. */
|
||
int last_line; /* The line of the thrown error, or 0. */
|
||
|
||
const char *dtd_name; /* The name of the expected / default DTD,
|
||
if specified. */
|
||
int is_xinclude; /* Are we the special <xi:include> parser? */
|
||
};
|
||
|
||
/* Process some body text. We accumulate the text for later use; it's
|
||
wrong to do anything with it immediately, because a single block of
|
||
text might be broken up into multiple calls to this function. */
|
||
|
||
static void
|
||
gdb_xml_body_text (void *data, const XML_Char *text, int length)
|
||
{
|
||
struct gdb_xml_parser *parser = data;
|
||
struct scope_level *scope = VEC_last (scope_level_s, parser->scopes);
|
||
|
||
if (parser->error.reason < 0)
|
||
return;
|
||
|
||
if (scope->body == NULL)
|
||
{
|
||
scope->body = XZALLOC (struct obstack);
|
||
obstack_init (scope->body);
|
||
}
|
||
|
||
obstack_grow (scope->body, text, length);
|
||
}
|
||
|
||
/* Issue a debugging message from one of PARSER's handlers. */
|
||
|
||
void
|
||
gdb_xml_debug (struct gdb_xml_parser *parser, const char *format, ...)
|
||
{
|
||
int line = XML_GetCurrentLineNumber (parser->expat_parser);
|
||
va_list ap;
|
||
char *message;
|
||
|
||
if (!debug_xml)
|
||
return;
|
||
|
||
va_start (ap, format);
|
||
message = xstrvprintf (format, ap);
|
||
if (line)
|
||
fprintf_unfiltered (gdb_stderr, "%s (line %d): %s\n",
|
||
parser->name, line, message);
|
||
else
|
||
fprintf_unfiltered (gdb_stderr, "%s: %s\n",
|
||
parser->name, message);
|
||
xfree (message);
|
||
}
|
||
|
||
/* Issue an error message from one of PARSER's handlers, and stop
|
||
parsing. */
|
||
|
||
void
|
||
gdb_xml_error (struct gdb_xml_parser *parser, const char *format, ...)
|
||
{
|
||
int line = XML_GetCurrentLineNumber (parser->expat_parser);
|
||
va_list ap;
|
||
|
||
parser->last_line = line;
|
||
va_start (ap, format);
|
||
throw_verror (XML_PARSE_ERROR, format, ap);
|
||
}
|
||
|
||
/* Clean up a vector of parsed attribute values. */
|
||
|
||
static void
|
||
gdb_xml_values_cleanup (void *data)
|
||
{
|
||
VEC(gdb_xml_value_s) **values = data;
|
||
struct gdb_xml_value *value;
|
||
int ix;
|
||
|
||
for (ix = 0; VEC_iterate (gdb_xml_value_s, *values, ix, value); ix++)
|
||
xfree (value->value);
|
||
VEC_free (gdb_xml_value_s, *values);
|
||
}
|
||
|
||
/* Handle the start of an element. DATA is our local XML parser, NAME
|
||
is the element, and ATTRS are the names and values of this
|
||
element's attributes. */
|
||
|
||
static void
|
||
gdb_xml_start_element (void *data, const XML_Char *name,
|
||
const XML_Char **attrs)
|
||
{
|
||
struct gdb_xml_parser *parser = data;
|
||
struct scope_level *scope;
|
||
struct scope_level new_scope;
|
||
const struct gdb_xml_element *element;
|
||
const struct gdb_xml_attribute *attribute;
|
||
VEC(gdb_xml_value_s) *attributes = NULL;
|
||
unsigned int seen;
|
||
struct cleanup *back_to;
|
||
|
||
/* Push an error scope. If we return or throw an exception before
|
||
filling this in, it will tell us to ignore children of this
|
||
element. */
|
||
VEC_reserve (scope_level_s, parser->scopes, 1);
|
||
scope = VEC_last (scope_level_s, parser->scopes);
|
||
memset (&new_scope, 0, sizeof (new_scope));
|
||
VEC_quick_push (scope_level_s, parser->scopes, &new_scope);
|
||
|
||
gdb_xml_debug (parser, _("Entering element <%s>"), name);
|
||
|
||
/* Find this element in the list of the current scope's allowed
|
||
children. Record that we've seen it. */
|
||
|
||
seen = 1;
|
||
for (element = scope->elements; element && element->name;
|
||
element++, seen <<= 1)
|
||
if (strcmp (element->name, name) == 0)
|
||
break;
|
||
|
||
if (element == NULL || element->name == NULL)
|
||
{
|
||
/* If we're working on XInclude, <xi:include> can be the child
|
||
of absolutely anything. Copy the previous scope's element
|
||
list into the new scope even if there was no match. */
|
||
if (parser->is_xinclude)
|
||
{
|
||
struct scope_level *unknown_scope;
|
||
|
||
XML_DefaultCurrent (parser->expat_parser);
|
||
|
||
unknown_scope = VEC_last (scope_level_s, parser->scopes);
|
||
unknown_scope->elements = scope->elements;
|
||
return;
|
||
}
|
||
|
||
gdb_xml_debug (parser, _("Element <%s> unknown"), name);
|
||
return;
|
||
}
|
||
|
||
if (!(element->flags & GDB_XML_EF_REPEATABLE) && (seen & scope->seen))
|
||
gdb_xml_error (parser, _("Element <%s> only expected once"), name);
|
||
|
||
scope->seen |= seen;
|
||
|
||
back_to = make_cleanup (gdb_xml_values_cleanup, &attributes);
|
||
|
||
for (attribute = element->attributes;
|
||
attribute != NULL && attribute->name != NULL;
|
||
attribute++)
|
||
{
|
||
const char *val = NULL;
|
||
const XML_Char **p;
|
||
void *parsed_value;
|
||
struct gdb_xml_value new_value;
|
||
|
||
for (p = attrs; *p != NULL; p += 2)
|
||
if (!strcmp (attribute->name, p[0]))
|
||
{
|
||
val = p[1];
|
||
break;
|
||
}
|
||
|
||
if (*p != NULL && val == NULL)
|
||
{
|
||
gdb_xml_debug (parser, _("Attribute \"%s\" missing a value"),
|
||
attribute->name);
|
||
continue;
|
||
}
|
||
|
||
if (*p == NULL && !(attribute->flags & GDB_XML_AF_OPTIONAL))
|
||
{
|
||
gdb_xml_error (parser, _("Required attribute \"%s\" of "
|
||
"<%s> not specified"),
|
||
attribute->name, element->name);
|
||
continue;
|
||
}
|
||
|
||
if (*p == NULL)
|
||
continue;
|
||
|
||
gdb_xml_debug (parser, _("Parsing attribute %s=\"%s\""),
|
||
attribute->name, val);
|
||
|
||
if (attribute->handler)
|
||
parsed_value = attribute->handler (parser, attribute, val);
|
||
else
|
||
parsed_value = xstrdup (val);
|
||
|
||
new_value.name = attribute->name;
|
||
new_value.value = parsed_value;
|
||
VEC_safe_push (gdb_xml_value_s, attributes, &new_value);
|
||
}
|
||
|
||
/* Check for unrecognized attributes. */
|
||
if (debug_xml)
|
||
{
|
||
const XML_Char **p;
|
||
|
||
for (p = attrs; *p != NULL; p += 2)
|
||
{
|
||
for (attribute = element->attributes;
|
||
attribute != NULL && attribute->name != NULL;
|
||
attribute++)
|
||
if (strcmp (attribute->name, *p) == 0)
|
||
break;
|
||
|
||
if (attribute == NULL || attribute->name == NULL)
|
||
gdb_xml_debug (parser, _("Ignoring unknown attribute %s"), *p);
|
||
}
|
||
}
|
||
|
||
/* Call the element handler if there is one. */
|
||
if (element->start_handler)
|
||
element->start_handler (parser, element, parser->user_data, attributes);
|
||
|
||
/* Fill in a new scope level. */
|
||
scope = VEC_last (scope_level_s, parser->scopes);
|
||
scope->element = element;
|
||
scope->elements = element->children;
|
||
|
||
do_cleanups (back_to);
|
||
}
|
||
|
||
/* Wrapper for gdb_xml_start_element, to prevent throwing exceptions
|
||
through expat. */
|
||
|
||
static void
|
||
gdb_xml_start_element_wrapper (void *data, const XML_Char *name,
|
||
const XML_Char **attrs)
|
||
{
|
||
struct gdb_xml_parser *parser = data;
|
||
volatile struct gdb_exception ex;
|
||
|
||
if (parser->error.reason < 0)
|
||
return;
|
||
|
||
TRY_CATCH (ex, RETURN_MASK_ALL)
|
||
{
|
||
gdb_xml_start_element (data, name, attrs);
|
||
}
|
||
if (ex.reason < 0)
|
||
{
|
||
parser->error = ex;
|
||
#ifdef HAVE_XML_STOPPARSER
|
||
XML_StopParser (parser->expat_parser, XML_FALSE);
|
||
#endif
|
||
}
|
||
}
|
||
|
||
/* Handle the end of an element. DATA is our local XML parser, and
|
||
NAME is the current element. */
|
||
|
||
static void
|
||
gdb_xml_end_element (void *data, const XML_Char *name)
|
||
{
|
||
struct gdb_xml_parser *parser = data;
|
||
struct scope_level *scope = VEC_last (scope_level_s, parser->scopes);
|
||
const struct gdb_xml_element *element;
|
||
unsigned int seen;
|
||
|
||
gdb_xml_debug (parser, _("Leaving element <%s>"), name);
|
||
|
||
for (element = scope->elements, seen = 1;
|
||
element != NULL && element->name != NULL;
|
||
element++, seen <<= 1)
|
||
if ((scope->seen & seen) == 0
|
||
&& (element->flags & GDB_XML_EF_OPTIONAL) == 0)
|
||
gdb_xml_error (parser, _("Required element <%s> is missing"),
|
||
element->name);
|
||
|
||
/* Call the element processor. */
|
||
if (scope->element != NULL && scope->element->end_handler)
|
||
{
|
||
char *body;
|
||
|
||
if (scope->body == NULL)
|
||
body = "";
|
||
else
|
||
{
|
||
int length;
|
||
|
||
length = obstack_object_size (scope->body);
|
||
obstack_1grow (scope->body, '\0');
|
||
body = obstack_finish (scope->body);
|
||
|
||
/* Strip leading and trailing whitespace. */
|
||
while (length > 0 && ISSPACE (body[length-1]))
|
||
body[--length] = '\0';
|
||
while (*body && ISSPACE (*body))
|
||
body++;
|
||
}
|
||
|
||
scope->element->end_handler (parser, scope->element, parser->user_data,
|
||
body);
|
||
}
|
||
else if (scope->element == NULL)
|
||
XML_DefaultCurrent (parser->expat_parser);
|
||
|
||
/* Pop the scope level. */
|
||
if (scope->body)
|
||
{
|
||
obstack_free (scope->body, NULL);
|
||
xfree (scope->body);
|
||
}
|
||
VEC_pop (scope_level_s, parser->scopes);
|
||
}
|
||
|
||
/* Wrapper for gdb_xml_end_element, to prevent throwing exceptions
|
||
through expat. */
|
||
|
||
static void
|
||
gdb_xml_end_element_wrapper (void *data, const XML_Char *name)
|
||
{
|
||
struct gdb_xml_parser *parser = data;
|
||
volatile struct gdb_exception ex;
|
||
|
||
if (parser->error.reason < 0)
|
||
return;
|
||
|
||
TRY_CATCH (ex, RETURN_MASK_ALL)
|
||
{
|
||
gdb_xml_end_element (data, name);
|
||
}
|
||
if (ex.reason < 0)
|
||
{
|
||
parser->error = ex;
|
||
#ifdef HAVE_XML_STOPPARSER
|
||
XML_StopParser (parser->expat_parser, XML_FALSE);
|
||
#endif
|
||
}
|
||
}
|
||
|
||
/* Free a parser and all its associated state. */
|
||
|
||
static void
|
||
gdb_xml_cleanup (void *arg)
|
||
{
|
||
struct gdb_xml_parser *parser = arg;
|
||
struct scope_level *scope;
|
||
int ix;
|
||
|
||
XML_ParserFree (parser->expat_parser);
|
||
|
||
/* Clean up the scopes. */
|
||
for (ix = 0; VEC_iterate (scope_level_s, parser->scopes, ix, scope); ix++)
|
||
if (scope->body)
|
||
{
|
||
obstack_free (scope->body, NULL);
|
||
xfree (scope->body);
|
||
}
|
||
VEC_free (scope_level_s, parser->scopes);
|
||
|
||
xfree (parser);
|
||
}
|
||
|
||
/* Initialize and return a parser. Register a cleanup to destroy the
|
||
parser. */
|
||
|
||
struct gdb_xml_parser *
|
||
gdb_xml_create_parser_and_cleanup (const char *name,
|
||
const struct gdb_xml_element *elements,
|
||
void *user_data)
|
||
{
|
||
struct gdb_xml_parser *parser;
|
||
struct scope_level start_scope;
|
||
|
||
/* Initialize the parser. */
|
||
parser = XZALLOC (struct gdb_xml_parser);
|
||
parser->expat_parser = XML_ParserCreateNS (NULL, '!');
|
||
if (parser->expat_parser == NULL)
|
||
{
|
||
xfree (parser);
|
||
nomem (0);
|
||
}
|
||
|
||
parser->name = name;
|
||
|
||
parser->user_data = user_data;
|
||
XML_SetUserData (parser->expat_parser, parser);
|
||
|
||
/* Set the callbacks. */
|
||
XML_SetElementHandler (parser->expat_parser, gdb_xml_start_element_wrapper,
|
||
gdb_xml_end_element_wrapper);
|
||
XML_SetCharacterDataHandler (parser->expat_parser, gdb_xml_body_text);
|
||
|
||
/* Initialize the outer scope. */
|
||
memset (&start_scope, 0, sizeof (start_scope));
|
||
start_scope.elements = elements;
|
||
VEC_safe_push (scope_level_s, parser->scopes, &start_scope);
|
||
|
||
make_cleanup (gdb_xml_cleanup, parser);
|
||
|
||
return parser;
|
||
}
|
||
|
||
/* External entity handler. The only external entities we support
|
||
are those compiled into GDB (we do not fetch entities from the
|
||
target). */
|
||
|
||
static int XMLCALL
|
||
gdb_xml_fetch_external_entity (XML_Parser expat_parser,
|
||
const XML_Char *context,
|
||
const XML_Char *base,
|
||
const XML_Char *systemId,
|
||
const XML_Char *publicId)
|
||
{
|
||
struct gdb_xml_parser *parser = XML_GetUserData (expat_parser);
|
||
XML_Parser entity_parser;
|
||
const char *text;
|
||
enum XML_Status status;
|
||
|
||
if (systemId == NULL)
|
||
{
|
||
text = fetch_xml_builtin (parser->dtd_name);
|
||
if (text == NULL)
|
||
internal_error (__FILE__, __LINE__, "could not locate built-in DTD %s",
|
||
parser->dtd_name);
|
||
}
|
||
else
|
||
{
|
||
text = fetch_xml_builtin (systemId);
|
||
if (text == NULL)
|
||
return XML_STATUS_ERROR;
|
||
}
|
||
|
||
entity_parser = XML_ExternalEntityParserCreate (expat_parser, context, NULL);
|
||
|
||
/* Don't use our handlers for the contents of the DTD. Just let expat
|
||
process it. */
|
||
XML_SetElementHandler (entity_parser, NULL, NULL);
|
||
XML_SetDoctypeDeclHandler (entity_parser, NULL, NULL);
|
||
XML_SetXmlDeclHandler (entity_parser, NULL);
|
||
XML_SetDefaultHandler (entity_parser, NULL);
|
||
XML_SetUserData (entity_parser, NULL);
|
||
|
||
status = XML_Parse (entity_parser, text, strlen (text), 1);
|
||
|
||
XML_ParserFree (entity_parser);
|
||
return status;
|
||
}
|
||
|
||
/* Associate DTD_NAME, which must be the name of a compiled-in DTD,
|
||
with PARSER. */
|
||
|
||
void
|
||
gdb_xml_use_dtd (struct gdb_xml_parser *parser, const char *dtd_name)
|
||
{
|
||
enum XML_Error err;
|
||
|
||
parser->dtd_name = dtd_name;
|
||
|
||
XML_SetParamEntityParsing (parser->expat_parser,
|
||
XML_PARAM_ENTITY_PARSING_UNLESS_STANDALONE);
|
||
XML_SetExternalEntityRefHandler (parser->expat_parser,
|
||
gdb_xml_fetch_external_entity);
|
||
|
||
/* Even if no DTD is provided, use the built-in DTD anyway. */
|
||
err = XML_UseForeignDTD (parser->expat_parser, XML_TRUE);
|
||
if (err != XML_ERROR_NONE)
|
||
internal_error (__FILE__, __LINE__,
|
||
"XML_UseForeignDTD failed: %s", XML_ErrorString (err));
|
||
}
|
||
|
||
/* Invoke PARSER on BUFFER. BUFFER is the data to parse, which
|
||
should be NUL-terminated.
|
||
|
||
The return value is 0 for success or -1 for error. It may throw,
|
||
but only if something unexpected goes wrong during parsing; parse
|
||
errors will be caught, warned about, and reported as failure. */
|
||
|
||
int
|
||
gdb_xml_parse (struct gdb_xml_parser *parser, const char *buffer)
|
||
{
|
||
enum XML_Status status;
|
||
const char *error_string;
|
||
|
||
gdb_xml_debug (parser, _("Starting:\n%s"), buffer);
|
||
|
||
status = XML_Parse (parser->expat_parser, buffer, strlen (buffer), 1);
|
||
|
||
if (status == XML_STATUS_OK && parser->error.reason == 0)
|
||
return 0;
|
||
|
||
if (parser->error.reason == RETURN_ERROR
|
||
&& parser->error.error == XML_PARSE_ERROR)
|
||
{
|
||
gdb_assert (parser->error.message != NULL);
|
||
error_string = parser->error.message;
|
||
}
|
||
else if (status == XML_STATUS_ERROR)
|
||
{
|
||
enum XML_Error err = XML_GetErrorCode (parser->expat_parser);
|
||
error_string = XML_ErrorString (err);
|
||
}
|
||
else
|
||
{
|
||
gdb_assert (parser->error.reason < 0);
|
||
throw_exception (parser->error);
|
||
}
|
||
|
||
if (parser->last_line != 0)
|
||
warning (_("while parsing %s (at line %d): %s"), parser->name,
|
||
parser->last_line, error_string);
|
||
else
|
||
warning (_("while parsing %s: %s"), parser->name, error_string);
|
||
|
||
return -1;
|
||
}
|
||
|
||
/* Parse a field VALSTR that we expect to contain an integer value.
|
||
The integer is returned in *VALP. The string is parsed with an
|
||
equivalent to strtoul.
|
||
|
||
Returns 0 for success, -1 for error. */
|
||
|
||
static int
|
||
xml_parse_unsigned_integer (const char *valstr, ULONGEST *valp)
|
||
{
|
||
const char *endptr;
|
||
ULONGEST result;
|
||
|
||
if (*valstr == '\0')
|
||
return -1;
|
||
|
||
result = strtoulst (valstr, &endptr, 0);
|
||
if (*endptr != '\0')
|
||
return -1;
|
||
|
||
*valp = result;
|
||
return 0;
|
||
}
|
||
|
||
/* Parse an integer string into a ULONGEST and return it, or call
|
||
gdb_xml_error if it could not be parsed. */
|
||
|
||
ULONGEST
|
||
gdb_xml_parse_ulongest (struct gdb_xml_parser *parser, const char *value)
|
||
{
|
||
ULONGEST result;
|
||
|
||
if (xml_parse_unsigned_integer (value, &result) != 0)
|
||
gdb_xml_error (parser, _("Can't convert \"%s\" to an integer"), value);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Parse an integer attribute into a ULONGEST. */
|
||
|
||
void *
|
||
gdb_xml_parse_attr_ulongest (struct gdb_xml_parser *parser,
|
||
const struct gdb_xml_attribute *attribute,
|
||
const char *value)
|
||
{
|
||
ULONGEST result;
|
||
void *ret;
|
||
|
||
if (xml_parse_unsigned_integer (value, &result) != 0)
|
||
gdb_xml_error (parser, _("Can't convert %s=\"%s\" to an integer"),
|
||
attribute->name, value);
|
||
|
||
ret = xmalloc (sizeof (result));
|
||
memcpy (ret, &result, sizeof (result));
|
||
return ret;
|
||
}
|
||
|
||
/* A handler_data for yes/no boolean values. */
|
||
|
||
const struct gdb_xml_enum gdb_xml_enums_boolean[] = {
|
||
{ "yes", 1 },
|
||
{ "no", 0 },
|
||
{ NULL, 0 }
|
||
};
|
||
|
||
/* Map NAME to VALUE. A struct gdb_xml_enum * should be saved as the
|
||
value of handler_data when using gdb_xml_parse_attr_enum to parse a
|
||
fixed list of possible strings. The list is terminated by an entry
|
||
with NAME == NULL. */
|
||
|
||
void *
|
||
gdb_xml_parse_attr_enum (struct gdb_xml_parser *parser,
|
||
const struct gdb_xml_attribute *attribute,
|
||
const char *value)
|
||
{
|
||
const struct gdb_xml_enum *enums = attribute->handler_data;
|
||
void *ret;
|
||
|
||
for (enums = attribute->handler_data; enums->name != NULL; enums++)
|
||
if (strcasecmp (enums->name, value) == 0)
|
||
break;
|
||
|
||
if (enums->name == NULL)
|
||
gdb_xml_error (parser, _("Unknown attribute value %s=\"%s\""),
|
||
attribute->name, value);
|
||
|
||
ret = xmalloc (sizeof (enums->value));
|
||
memcpy (ret, &enums->value, sizeof (enums->value));
|
||
return ret;
|
||
}
|
||
|
||
|
||
/* XInclude processing. This is done as a separate step from actually
|
||
parsing the document, so that we can produce a single combined XML
|
||
document - e.g. to hand to a front end or to simplify comparing two
|
||
documents. We make extensive use of XML_DefaultCurrent, to pass
|
||
input text directly into the output without reformatting or
|
||
requoting it.
|
||
|
||
We output the DOCTYPE declaration for the first document unchanged,
|
||
if present, and discard DOCTYPEs from included documents. Only the
|
||
one we pass through here is used when we feed the result back to
|
||
expat. The XInclude standard explicitly does not discuss
|
||
validation of the result; we choose to apply the same DTD applied
|
||
to the outermost document.
|
||
|
||
We can not simply include the external DTD subset in the document
|
||
as an internal subset, because <!IGNORE> and <!INCLUDE> are valid
|
||
only in external subsets. But if we do not pass the DTD into the
|
||
output at all, default values will not be filled in.
|
||
|
||
We don't pass through any <?xml> declaration because we generate
|
||
UTF-8, not whatever the input encoding was. */
|
||
|
||
struct xinclude_parsing_data
|
||
{
|
||
/* The obstack to build the output in. */
|
||
struct obstack obstack;
|
||
|
||
/* A count indicating whether we are in an element whose
|
||
children should not be copied to the output, and if so,
|
||
how deep we are nested. This is used for anything inside
|
||
an xi:include, and for the DTD. */
|
||
int skip_depth;
|
||
|
||
/* The number of <xi:include> elements currently being processed,
|
||
to detect loops. */
|
||
int include_depth;
|
||
|
||
/* A function to call to obtain additional features, and its
|
||
baton. */
|
||
xml_fetch_another fetcher;
|
||
void *fetcher_baton;
|
||
};
|
||
|
||
static void
|
||
xinclude_start_include (struct gdb_xml_parser *parser,
|
||
const struct gdb_xml_element *element,
|
||
void *user_data, VEC(gdb_xml_value_s) *attributes)
|
||
{
|
||
struct xinclude_parsing_data *data = user_data;
|
||
char *href = VEC_index (gdb_xml_value_s, attributes, 0)->value;
|
||
struct cleanup *back_to;
|
||
char *text, *output;
|
||
|
||
gdb_xml_debug (parser, _("Processing XInclude of \"%s\""), href);
|
||
|
||
if (data->include_depth > MAX_XINCLUDE_DEPTH)
|
||
gdb_xml_error (parser, _("Maximum XInclude depth (%d) exceeded"),
|
||
MAX_XINCLUDE_DEPTH);
|
||
|
||
text = data->fetcher (href, data->fetcher_baton);
|
||
if (text == NULL)
|
||
gdb_xml_error (parser, _("Could not load XML document \"%s\""), href);
|
||
back_to = make_cleanup (xfree, text);
|
||
|
||
output = xml_process_xincludes (parser->name, text, data->fetcher,
|
||
data->fetcher_baton,
|
||
data->include_depth + 1);
|
||
if (output == NULL)
|
||
gdb_xml_error (parser, _("Parsing \"%s\" failed"), href);
|
||
|
||
obstack_grow (&data->obstack, output, strlen (output));
|
||
xfree (output);
|
||
|
||
do_cleanups (back_to);
|
||
|
||
data->skip_depth++;
|
||
}
|
||
|
||
static void
|
||
xinclude_end_include (struct gdb_xml_parser *parser,
|
||
const struct gdb_xml_element *element,
|
||
void *user_data, const char *body_text)
|
||
{
|
||
struct xinclude_parsing_data *data = user_data;
|
||
|
||
data->skip_depth--;
|
||
}
|
||
|
||
static void XMLCALL
|
||
xml_xinclude_default (void *data_, const XML_Char *s, int len)
|
||
{
|
||
struct gdb_xml_parser *parser = data_;
|
||
struct xinclude_parsing_data *data = parser->user_data;
|
||
|
||
/* If we are inside of e.g. xi:include or the DTD, don't save this
|
||
string. */
|
||
if (data->skip_depth)
|
||
return;
|
||
|
||
/* Otherwise just add it to the end of the document we're building
|
||
up. */
|
||
obstack_grow (&data->obstack, s, len);
|
||
}
|
||
|
||
static void XMLCALL
|
||
xml_xinclude_start_doctype (void *data_, const XML_Char *doctypeName,
|
||
const XML_Char *sysid, const XML_Char *pubid,
|
||
int has_internal_subset)
|
||
{
|
||
struct gdb_xml_parser *parser = data_;
|
||
struct xinclude_parsing_data *data = parser->user_data;
|
||
|
||
/* Don't print out the doctype, or the contents of the DTD internal
|
||
subset, if any. */
|
||
data->skip_depth++;
|
||
}
|
||
|
||
static void XMLCALL
|
||
xml_xinclude_end_doctype (void *data_)
|
||
{
|
||
struct gdb_xml_parser *parser = data_;
|
||
struct xinclude_parsing_data *data = parser->user_data;
|
||
|
||
data->skip_depth--;
|
||
}
|
||
|
||
static void XMLCALL
|
||
xml_xinclude_xml_decl (void *data_, const XML_Char *version,
|
||
const XML_Char *encoding, int standalone)
|
||
{
|
||
/* Do nothing - this function prevents the default handler from
|
||
being called, thus suppressing the XML declaration from the
|
||
output. */
|
||
}
|
||
|
||
static void
|
||
xml_xinclude_cleanup (void *data_)
|
||
{
|
||
struct xinclude_parsing_data *data = data_;
|
||
|
||
obstack_free (&data->obstack, NULL);
|
||
xfree (data);
|
||
}
|
||
|
||
const struct gdb_xml_attribute xinclude_attributes[] = {
|
||
{ "href", GDB_XML_AF_NONE, NULL, NULL },
|
||
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
|
||
};
|
||
|
||
const struct gdb_xml_element xinclude_elements[] = {
|
||
{ "http://www.w3.org/2001/XInclude!include", xinclude_attributes, NULL,
|
||
GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
|
||
xinclude_start_include, xinclude_end_include },
|
||
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
|
||
};
|
||
|
||
/* The main entry point for <xi:include> processing. */
|
||
|
||
char *
|
||
xml_process_xincludes (const char *name, const char *text,
|
||
xml_fetch_another fetcher, void *fetcher_baton,
|
||
int depth)
|
||
{
|
||
struct gdb_xml_parser *parser;
|
||
struct xinclude_parsing_data *data;
|
||
struct cleanup *back_to;
|
||
char *result = NULL;
|
||
|
||
data = XZALLOC (struct xinclude_parsing_data);
|
||
obstack_init (&data->obstack);
|
||
back_to = make_cleanup (xml_xinclude_cleanup, data);
|
||
|
||
parser = gdb_xml_create_parser_and_cleanup (name, xinclude_elements, data);
|
||
parser->is_xinclude = 1;
|
||
|
||
data->include_depth = depth;
|
||
data->fetcher = fetcher;
|
||
data->fetcher_baton = fetcher_baton;
|
||
|
||
XML_SetCharacterDataHandler (parser->expat_parser, NULL);
|
||
XML_SetDefaultHandler (parser->expat_parser, xml_xinclude_default);
|
||
|
||
/* Always discard the XML version declarations; the only important
|
||
thing this provides is encoding, and our result will have been
|
||
converted to UTF-8. */
|
||
XML_SetXmlDeclHandler (parser->expat_parser, xml_xinclude_xml_decl);
|
||
|
||
if (depth > 0)
|
||
/* Discard the doctype for included documents. */
|
||
XML_SetDoctypeDeclHandler (parser->expat_parser,
|
||
xml_xinclude_start_doctype,
|
||
xml_xinclude_end_doctype);
|
||
|
||
gdb_xml_use_dtd (parser, "xinclude.dtd");
|
||
|
||
if (gdb_xml_parse (parser, text) == 0)
|
||
{
|
||
obstack_1grow (&data->obstack, '\0');
|
||
result = xstrdup (obstack_finish (&data->obstack));
|
||
|
||
if (depth == 0)
|
||
gdb_xml_debug (parser, _("XInclude processing succeeded."));
|
||
}
|
||
else
|
||
result = NULL;
|
||
|
||
do_cleanups (back_to);
|
||
return result;
|
||
}
|
||
#endif /* HAVE_LIBEXPAT */
|
||
|
||
|
||
/* Return an XML document which was compiled into GDB, from
|
||
the given FILENAME, or NULL if the file was not compiled in. */
|
||
|
||
const char *
|
||
fetch_xml_builtin (const char *filename)
|
||
{
|
||
const char *(*p)[2];
|
||
|
||
for (p = xml_builtin; (*p)[0]; p++)
|
||
if (strcmp ((*p)[0], filename) == 0)
|
||
return (*p)[1];
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* A to_xfer_partial helper function which reads XML files which were
|
||
compiled into GDB. The target may call this function from its own
|
||
to_xfer_partial handler, after converting object and annex to the
|
||
appropriate filename. */
|
||
|
||
LONGEST
|
||
xml_builtin_xfer_partial (const char *filename,
|
||
gdb_byte *readbuf, const gdb_byte *writebuf,
|
||
ULONGEST offset, LONGEST len)
|
||
{
|
||
const char *buf;
|
||
LONGEST len_avail;
|
||
|
||
gdb_assert (readbuf != NULL && writebuf == NULL);
|
||
gdb_assert (filename != NULL);
|
||
|
||
buf = fetch_xml_builtin (filename);
|
||
if (buf == NULL)
|
||
return -1;
|
||
|
||
len_avail = strlen (buf);
|
||
if (offset >= len_avail)
|
||
return 0;
|
||
|
||
if (len > len_avail - offset)
|
||
len = len_avail - offset;
|
||
memcpy (readbuf, buf + offset, len);
|
||
return len;
|
||
}
|
||
|
||
|
||
static void
|
||
show_debug_xml (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("XML debugging is %s.\n"), value);
|
||
}
|
||
|
||
/* Return a malloc allocated string with special characters from TEXT
|
||
replaced by entity references. */
|
||
|
||
char *
|
||
xml_escape_text (const char *text)
|
||
{
|
||
char *result;
|
||
int i, special;
|
||
|
||
/* Compute the length of the result. */
|
||
for (i = 0, special = 0; text[i] != '\0'; i++)
|
||
switch (text[i])
|
||
{
|
||
case '\'':
|
||
case '\"':
|
||
special += 5;
|
||
break;
|
||
case '&':
|
||
special += 4;
|
||
break;
|
||
case '<':
|
||
case '>':
|
||
special += 3;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
/* Expand the result. */
|
||
result = xmalloc (i + special + 1);
|
||
for (i = 0, special = 0; text[i] != '\0'; i++)
|
||
switch (text[i])
|
||
{
|
||
case '\'':
|
||
strcpy (result + i + special, "'");
|
||
special += 5;
|
||
break;
|
||
case '\"':
|
||
strcpy (result + i + special, """);
|
||
special += 5;
|
||
break;
|
||
case '&':
|
||
strcpy (result + i + special, "&");
|
||
special += 4;
|
||
break;
|
||
case '<':
|
||
strcpy (result + i + special, "<");
|
||
special += 3;
|
||
break;
|
||
case '>':
|
||
strcpy (result + i + special, ">");
|
||
special += 3;
|
||
break;
|
||
default:
|
||
result[i + special] = text[i];
|
||
break;
|
||
}
|
||
result[i + special] = '\0';
|
||
|
||
return result;
|
||
}
|
||
|
||
void
|
||
obstack_xml_printf (struct obstack *obstack, const char *format, ...)
|
||
{
|
||
va_list ap;
|
||
const char *f;
|
||
const char *prev;
|
||
int percent = 0;
|
||
|
||
va_start (ap, format);
|
||
|
||
prev = format;
|
||
for (f = format; *f; f++)
|
||
{
|
||
if (percent)
|
||
{
|
||
switch (*f)
|
||
{
|
||
case 's':
|
||
{
|
||
char *p;
|
||
char *a = va_arg (ap, char *);
|
||
obstack_grow (obstack, prev, f - prev - 1);
|
||
p = xml_escape_text (a);
|
||
obstack_grow_str (obstack, p);
|
||
xfree (p);
|
||
prev = f + 1;
|
||
}
|
||
break;
|
||
}
|
||
percent = 0;
|
||
}
|
||
else if (*f == '%')
|
||
percent = 1;
|
||
}
|
||
|
||
obstack_grow_str (obstack, prev);
|
||
va_end (ap);
|
||
}
|
||
|
||
char *
|
||
xml_fetch_content_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;
|
||
}
|
||
|
||
void _initialize_xml_support (void);
|
||
|
||
void
|
||
_initialize_xml_support (void)
|
||
{
|
||
add_setshow_boolean_cmd ("xml", class_maintenance, &debug_xml,
|
||
_("Set XML parser debugging."),
|
||
_("Show XML parser debugging."),
|
||
_("When set, debugging messages for XML parsers "
|
||
"are displayed."),
|
||
NULL, show_debug_xml,
|
||
&setdebuglist, &showdebuglist);
|
||
}
|