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123dc83914
(xml-tdesc.o): Update. * xml-support.c: Add a comment. (gdb_xml_enums_boolean): New variable. (gdb_xml_parse_attr_enum): Use strcasecmp. * xml-support.h (gdb_xml_enums_boolean): Declare. * xml-tdesc.c (struct tdesc_parsing_data): Record current_feature, next_regnum, and current_union. (tdesc_start_feature, tdesc_start_reg, tdesc_start_union) (tdesc_end_union, tdesc_start_field, tdesc_start_vector) (field_attributes, union_children, reg_attributes, union_attributes) (vector_attributes, feature_attributes, feature_children): New. (target_children): Make static. Add <feature>. (tdesc_elements): Make static. * target-descriptions.c (struct tdesc_reg, tdesc_reg_p, type_p) (struct tdesc_feature, tdesc_feature_p): New types. (struct target_desc): Add features member. (struct tdesc_arch_data, tdesc_data): New. (target_find_description): Clarify error message. Warn about ignored register descriptions. (tdesc_has_registers, tdesc_find_feature, tdesc_feature_name) (tdesc_named_type, tdesc_data_init, tdesc_data_alloc) (tdesc_data_cleanup, tdesc_numbered_register) (tdesc_numbered_register_choices, tdesc_find_register) (tdesc_register_name, tdesc_register_type) (tdesc_remote_register_number, tdesc_register_reggroup_p) (set_tdesc_pseudo_register_name, set_tdesc_pseudo_register_type) (set_tdesc_pseudo_register_reggroup_p, tdesc_use_registers) (tdesc_free_reg, tdesc_create_reg, tdesc_free_feature) (tdesc_create_feature, tdesc_record_type): New. (free_target_description): Free features. (_initialize_target_descriptions): Initialize tdesc_data. * arch-utils.c (default_remote_register_number): New. * arch-utils.h (default_remote_register_number): New prototype. * target-descriptions.h (set_tdesc_pseudo_register_name) (set_tdesc_pseudo_register_type, set_tdesc_pseudo_register_reggroup_p) (tdesc_use_registers, tdesc_data_alloc, tdesc_data_cleanup) (tdesc_numbered_register, tdesc_numbered_register_choices) (tdesc_has_registers, tdesc_find_feature, tdesc_feature_name) (tdesc_named_type, tdesc_create_feature, tdesc_record_type) (tdesc_create_reg): Declare. * gdbarch.sh (remote_register_number): New entry. * gdbarch.c, gdbarch.h: Regenerate. * remote.c (init_remote_state): Use gdbarch_remote_register_number. * features/gdb-target.dtd: Add feature, reg, vector, union, and field. * arm-tdep.c (arm_register_aliases): New. (arm_register_name_strings): Rename to... (arm_register_names): ...this. Make const. Delete the old version. (current_option, arm_register_byte): Delete. (set_disassembly_style): Simplify. Do not adjust arm_register_names. (value_of_arm_user_reg): New. (arm_gdbarch_init): Verify any described registers. Call tdesc_use_registers. Don't use arm_register_byte. Create aliases for standard register names. (_initialize_arm_tdep): Do not adjust arm_register_names. * user-regs.c (struct user_reg): Add baton member. (append_user_reg, user_reg_add_builtin, user_regs_init) (user_reg_add, value_of_user_reg): Use a baton for user register functions. * std-regs.c: Update. * user-regs.h (user_reg_read_ftype, user_reg_add_builtin) (user_reg_add): Add baton argument. * NEWS: Mention target description register support. * features/arm-core.xml, features/arm-fpa.xml: New. * eval.c (evaluate_subexp_standard): Allow ptype $register when the program is not running. * gdb.texinfo (-target-disconnect): Use @smallexample. (Requirements): Add anchor for Expat. Update description. (Target Descriptions): Mention Expat. (Target Description Format): Document new elements. Use @smallexample. (Predefined Target Types, Standard Target Features): New sections. * doc/gdbint.texinfo (Target Descriptions): New section. * gdb.xml/single-reg.xml, gdb.xml/tdesc-regs.exp, gdb.xml/core-only.xml, gdb.xml/extra-regs.xml: New files.
922 lines
25 KiB
C
922 lines
25 KiB
C
/* Helper routines for parsing XML using Expat.
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Copyright (C) 2006, 2007 Free Software Foundation, Inc.
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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 "gdbcmd.h"
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/* Debugging flag. */
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static int debug_xml;
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/* The contents of this file are only useful if XML support is
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available. */
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#ifdef HAVE_LIBEXPAT
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#include "exceptions.h"
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#include "xml-support.h"
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#include "gdb_expat.h"
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#include "gdb_string.h"
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#include "safe-ctype.h"
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/* The maximum depth of <xi:include> nesting. No need to be miserly,
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we just want to avoid running out of stack on loops. */
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#define MAX_XINCLUDE_DEPTH 30
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/* Simplified XML parser infrastructure. */
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/* A parsing level -- used to keep track of the current element
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nesting. */
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struct scope_level
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{
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/* Elements we allow at this level. */
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const struct gdb_xml_element *elements;
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/* The element which we are within. */
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const struct gdb_xml_element *element;
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/* Mask of which elements we've seen at this level (used for
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optional and repeatable checking). */
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unsigned int seen;
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/* Body text accumulation. */
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struct obstack *body;
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};
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typedef struct scope_level scope_level_s;
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DEF_VEC_O(scope_level_s);
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/* The parser itself, and our additional state. */
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struct gdb_xml_parser
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{
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XML_Parser expat_parser; /* The underlying expat parser. */
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const char *name; /* Name of this parser. */
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void *user_data; /* The user's callback data, for handlers. */
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VEC(scope_level_s) *scopes; /* Scoping stack. */
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struct gdb_exception error; /* A thrown error, if any. */
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int last_line; /* The line of the thrown error, or 0. */
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const char *dtd_name; /* The name of the expected / default DTD,
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if specified. */
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int is_xinclude; /* Are we the special <xi:include> parser? */
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};
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/* Process some body text. We accumulate the text for later use; it's
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wrong to do anything with it immediately, because a single block of
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text might be broken up into multiple calls to this function. */
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static void
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gdb_xml_body_text (void *data, const XML_Char *text, int length)
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{
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struct gdb_xml_parser *parser = data;
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struct scope_level *scope = VEC_last (scope_level_s, parser->scopes);
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if (parser->error.reason < 0)
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return;
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if (scope->body == NULL)
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{
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scope->body = XZALLOC (struct obstack);
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obstack_init (scope->body);
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}
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obstack_grow (scope->body, text, length);
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}
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/* Issue a debugging message from one of PARSER's handlers. */
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void
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gdb_xml_debug (struct gdb_xml_parser *parser, const char *format, ...)
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{
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int line = XML_GetCurrentLineNumber (parser->expat_parser);
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va_list ap;
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char *message;
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if (!debug_xml)
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return;
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va_start (ap, format);
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message = xstrvprintf (format, ap);
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if (line)
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fprintf_unfiltered (gdb_stderr, "%s (line %d): %s\n",
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parser->name, line, message);
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else
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fprintf_unfiltered (gdb_stderr, "%s: %s\n",
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parser->name, message);
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xfree (message);
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}
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/* Issue an error message from one of PARSER's handlers, and stop
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parsing. */
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void
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gdb_xml_error (struct gdb_xml_parser *parser, const char *format, ...)
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{
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int line = XML_GetCurrentLineNumber (parser->expat_parser);
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va_list ap;
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parser->last_line = line;
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va_start (ap, format);
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throw_verror (XML_PARSE_ERROR, format, ap);
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}
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/* Clean up a vector of parsed attribute values. */
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static void
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gdb_xml_values_cleanup (void *data)
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{
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VEC(gdb_xml_value_s) **values = data;
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struct gdb_xml_value *value;
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int ix;
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for (ix = 0; VEC_iterate (gdb_xml_value_s, *values, ix, value); ix++)
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xfree (value->value);
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VEC_free (gdb_xml_value_s, *values);
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}
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/* Handle the start of an element. DATA is our local XML parser, NAME
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is the element, and ATTRS are the names and values of this
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element's attributes. */
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static void
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gdb_xml_start_element (void *data, const XML_Char *name,
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const XML_Char **attrs)
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{
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struct gdb_xml_parser *parser = data;
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struct scope_level *scope;
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struct scope_level new_scope;
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const struct gdb_xml_element *element;
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const struct gdb_xml_attribute *attribute;
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VEC(gdb_xml_value_s) *attributes = NULL;
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unsigned int seen;
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struct cleanup *back_to;
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/* Push an error scope. If we return or throw an exception before
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filling this in, it will tell us to ignore children of this
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element. */
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VEC_reserve (scope_level_s, parser->scopes, 1);
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scope = VEC_last (scope_level_s, parser->scopes);
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memset (&new_scope, 0, sizeof (new_scope));
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VEC_quick_push (scope_level_s, parser->scopes, &new_scope);
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gdb_xml_debug (parser, _("Entering element <%s>"), name);
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/* Find this element in the list of the current scope's allowed
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children. Record that we've seen it. */
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seen = 1;
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for (element = scope->elements; element && element->name;
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element++, seen <<= 1)
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if (strcmp (element->name, name) == 0)
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break;
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if (element == NULL || element->name == NULL)
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{
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/* If we're working on XInclude, <xi:include> can be the child
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of absolutely anything. Copy the previous scope's element
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list into the new scope even if there was no match. */
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if (parser->is_xinclude)
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{
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struct scope_level *unknown_scope;
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XML_DefaultCurrent (parser->expat_parser);
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unknown_scope = VEC_last (scope_level_s, parser->scopes);
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unknown_scope->elements = scope->elements;
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return;
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}
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gdb_xml_debug (parser, _("Element <%s> unknown"), name);
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return;
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}
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if (!(element->flags & GDB_XML_EF_REPEATABLE) && (seen & scope->seen))
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gdb_xml_error (parser, _("Element <%s> only expected once"), name);
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scope->seen |= seen;
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back_to = make_cleanup (gdb_xml_values_cleanup, &attributes);
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for (attribute = element->attributes;
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attribute != NULL && attribute->name != NULL;
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attribute++)
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{
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const char *val = NULL;
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const XML_Char **p;
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void *parsed_value;
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struct gdb_xml_value new_value;
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for (p = attrs; *p != NULL; p += 2)
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if (!strcmp (attribute->name, p[0]))
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{
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val = p[1];
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break;
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}
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if (*p != NULL && val == NULL)
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{
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gdb_xml_debug (parser, _("Attribute \"%s\" missing a value"),
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attribute->name);
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continue;
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}
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if (*p == NULL && !(attribute->flags & GDB_XML_AF_OPTIONAL))
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{
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gdb_xml_error (parser, _("Required attribute \"%s\" of "
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"<%s> not specified"),
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attribute->name, element->name);
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continue;
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}
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if (*p == NULL)
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continue;
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gdb_xml_debug (parser, _("Parsing attribute %s=\"%s\""),
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attribute->name, val);
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if (attribute->handler)
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parsed_value = attribute->handler (parser, attribute, val);
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else
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parsed_value = xstrdup (val);
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new_value.name = attribute->name;
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new_value.value = parsed_value;
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VEC_safe_push (gdb_xml_value_s, attributes, &new_value);
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}
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/* Check for unrecognized attributes. */
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if (debug_xml)
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{
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const XML_Char **p;
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for (p = attrs; *p != NULL; p += 2)
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{
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for (attribute = element->attributes;
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attribute != NULL && attribute->name != NULL;
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attribute++)
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if (strcmp (attribute->name, *p) == 0)
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break;
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if (attribute == NULL || attribute->name == NULL)
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gdb_xml_debug (parser, _("Ignoring unknown attribute %s"), *p);
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}
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}
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/* Call the element handler if there is one. */
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if (element->start_handler)
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element->start_handler (parser, element, parser->user_data, attributes);
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/* Fill in a new scope level. */
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scope = VEC_last (scope_level_s, parser->scopes);
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scope->element = element;
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scope->elements = element->children;
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do_cleanups (back_to);
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}
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/* Wrapper for gdb_xml_start_element, to prevent throwing exceptions
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through expat. */
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static void
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gdb_xml_start_element_wrapper (void *data, const XML_Char *name,
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const XML_Char **attrs)
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{
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struct gdb_xml_parser *parser = data;
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volatile struct gdb_exception ex;
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if (parser->error.reason < 0)
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return;
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TRY_CATCH (ex, RETURN_MASK_ALL)
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{
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gdb_xml_start_element (data, name, attrs);
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}
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if (ex.reason < 0)
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{
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parser->error = ex;
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#ifdef HAVE_XML_STOPPARSER
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XML_StopParser (parser->expat_parser, XML_FALSE);
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#endif
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}
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}
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/* Handle the end of an element. DATA is our local XML parser, and
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NAME is the current element. */
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static void
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gdb_xml_end_element (void *data, const XML_Char *name)
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{
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struct gdb_xml_parser *parser = data;
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struct scope_level *scope = VEC_last (scope_level_s, parser->scopes);
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const struct gdb_xml_element *element;
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unsigned int seen;
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gdb_xml_debug (parser, _("Leaving element <%s>"), name);
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for (element = scope->elements, seen = 1;
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element != NULL && element->name != NULL;
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element++, seen <<= 1)
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if ((scope->seen & seen) == 0
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&& (element->flags & GDB_XML_EF_OPTIONAL) == 0)
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gdb_xml_error (parser, _("Required element <%s> is missing"),
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element->name);
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/* Call the element processor. */
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if (scope->element != NULL && scope->element->end_handler)
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{
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char *body;
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if (scope->body == NULL)
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body = "";
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else
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{
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int length;
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length = obstack_object_size (scope->body);
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obstack_1grow (scope->body, '\0');
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body = obstack_finish (scope->body);
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/* Strip leading and trailing whitespace. */
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while (length > 0 && ISSPACE (body[length-1]))
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body[--length] = '\0';
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while (*body && ISSPACE (*body))
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body++;
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}
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scope->element->end_handler (parser, scope->element, parser->user_data,
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body);
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}
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else if (scope->element == NULL)
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XML_DefaultCurrent (parser->expat_parser);
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/* Pop the scope level. */
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if (scope->body)
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{
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obstack_free (scope->body, NULL);
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xfree (scope->body);
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}
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VEC_pop (scope_level_s, parser->scopes);
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}
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/* Wrapper for gdb_xml_end_element, to prevent throwing exceptions
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through expat. */
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static void
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gdb_xml_end_element_wrapper (void *data, const XML_Char *name)
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{
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struct gdb_xml_parser *parser = data;
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volatile struct gdb_exception ex;
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if (parser->error.reason < 0)
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return;
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TRY_CATCH (ex, RETURN_MASK_ALL)
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{
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gdb_xml_end_element (data, name);
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}
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if (ex.reason < 0)
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{
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parser->error = ex;
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#ifdef HAVE_XML_STOPPARSER
|
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XML_StopParser (parser->expat_parser, XML_FALSE);
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#endif
|
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}
|
||
}
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||
|
||
/* Free a parser and all its associated state. */
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static void
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gdb_xml_cleanup (void *arg)
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{
|
||
struct gdb_xml_parser *parser = arg;
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struct scope_level *scope;
|
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int ix;
|
||
|
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XML_ParserFree (parser->expat_parser);
|
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|
||
/* Clean up the scopes. */
|
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for (ix = 0; VEC_iterate (scope_level_s, parser->scopes, ix, scope); ix++)
|
||
if (scope->body)
|
||
{
|
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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;
|
||
|
||
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;
|
||
int ret;
|
||
|
||
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)
|
||
{
|
||
enum XML_Error err;
|
||
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:\n%s"),
|
||
result);
|
||
}
|
||
else
|
||
result = NULL;
|
||
|
||
do_cleanups (back_to);
|
||
return result;
|
||
}
|
||
|
||
|
||
/* 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;
|
||
}
|
||
|
||
#endif /* HAVE_LIBEXPAT */
|
||
|
||
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);
|
||
}
|
||
|
||
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);
|
||
}
|