gdb/osdata.c

   1 /* Routines for handling XML generic OS data provided by target.
   2
   3    Copyright (C) 2008, 2009 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "target.h"
  22 #include "vec.h"
  23 #include "xml-support.h"
  24 #include "osdata.h"
  25 #include "gdb_string.h"
  26 #include "ui-out.h"
  27 #include "gdbcmd.h"
  28
  29 #if !defined(HAVE_LIBEXPAT)
  30
  31 struct osdata *
  32 osdata_parse (const char *xml)
  33 {
  34   static int have_warned;
  35
  36   if (!have_warned)
  37     {
  38       have_warned = 1;
  39       warning (_("Can not parse XML OS data; XML support was disabled "
  40                 "at compile time"));
  41     }
  42
  43   return NULL;
  44 }
  45
  46 #else /* HAVE_LIBEXPAT */
  47
  48 #include "xml-support.h"
  49
  50 /* Internal parsing data passed to all XML callbacks.  */
  51 struct osdata_parsing_data
  52   {
  53     struct osdata *osdata;
  54     char *property_name;
  55   };
  56
  57 /* Handle the start of a <osdata> element.  */
  58
  59 static void
  60 osdata_start_osdata (struct gdb_xml_parser *parser,
  61                         const struct gdb_xml_element *element,
  62                         void *user_data, VEC(gdb_xml_value_s) *attributes)
  63 {
  64   struct osdata_parsing_data *data = user_data;
  65   char *type;
  66   struct osdata *osdata;
  67
  68   if (data->osdata)
  69     gdb_xml_error (parser, _("Seen more than on osdata element"));
  70
  71   type = VEC_index (gdb_xml_value_s, attributes, 0)->value;
  72   osdata = XZALLOC (struct osdata);
  73   osdata->type = xstrdup (type);
  74   data->osdata = osdata;
  75 }
  76
  77 /* Handle the start of a <item> element.  */
  78
  79 static void
  80 osdata_start_item (struct gdb_xml_parser *parser,
  81                   const struct gdb_xml_element *element,
  82                   void *user_data, VEC(gdb_xml_value_s) *attributes)
  83 {
  84   struct osdata_parsing_data *data = user_data;
  85   struct osdata_item item = { NULL };
  86   VEC_safe_push (osdata_item_s, data->osdata->items, &item);
  87 }
  88
  89 /* Handle the start of a <column> element.  */
  90
  91 static void
  92 osdata_start_column (struct gdb_xml_parser *parser,
  93                     const struct gdb_xml_element *element,
  94                     void *user_data, VEC(gdb_xml_value_s) *attributes)
  95 {
  96   struct osdata_parsing_data *data = user_data;
  97   const char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value;
  98   data->property_name = xstrdup (name);
  99 }
 100
 101 /* Handle the end of a <column> element.  */
 102
 103 static void
 104 osdata_end_column (struct gdb_xml_parser *parser,
 105                   const struct gdb_xml_element *element,
 106                   void *user_data, const char *body_text)
 107 {
 108   struct osdata_parsing_data *data = user_data;
 109   struct osdata *osdata = data->osdata;
 110   struct osdata_item *item = VEC_last (osdata_item_s, osdata->items);
 111   struct osdata_column *col = VEC_safe_push (osdata_column_s,
 112                                             item->columns, NULL);
 113
 114   /* Transfer memory ownership.  NAME was already strdup'ed.  */
 115   col->name = data->property_name;
 116   col->value = xstrdup (body_text);
 117   data->property_name = NULL;
 118 }
 119
 120 /* Discard the constructed osdata (if an error occurs).  */
 121
 122 static void
 123 clear_parsing_data (void *p)
 124 {
 125   struct osdata_parsing_data *data = p;
 126   osdata_free (data->osdata);
 127   data->osdata = NULL;
 128   xfree (data->property_name);
 129   data->property_name = NULL;
 130 }
 131
 132 /* The allowed elements and attributes for OS data object.
 133    The root element is a <osdata>.  */
 134
 135 const struct gdb_xml_attribute column_attributes[] = {
 136   { "name", GDB_XML_AF_NONE, NULL, NULL },
 137   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 138 };
 139
 140 const struct gdb_xml_element item_children[] = {
 141   { "column", column_attributes, NULL,
 142     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 143     osdata_start_column, osdata_end_column },
 144   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 145 };
 146
 147 const struct gdb_xml_attribute osdata_attributes[] = {
 148   { "type", GDB_XML_AF_NONE, NULL, NULL },
 149   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 150 };
 151
 152 const struct gdb_xml_element osdata_children[] = {
 153   { "item", NULL, item_children,
 154     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 155     osdata_start_item, NULL },
 156   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 157 };
 158
 159 const struct gdb_xml_element osdata_elements[] = {
 160   { "osdata", osdata_attributes, osdata_children,
 161     GDB_XML_EF_NONE, osdata_start_osdata, NULL },
 162   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 163 };
 164
 165 struct osdata *
 166 osdata_parse (const char *xml)
 167 {
 168   struct gdb_xml_parser *parser;
 169   struct cleanup *before_deleting_result, *back_to;
 170   struct osdata_parsing_data data = { NULL };
 171
 172   back_to = make_cleanup (null_cleanup, NULL);
 173   parser = gdb_xml_create_parser_and_cleanup (_("osdata"),
 174                                              osdata_elements, &data);
 175   gdb_xml_use_dtd (parser, "osdata.dtd");
 176
 177   before_deleting_result = make_cleanup (clear_parsing_data, &data);
 178
 179   if (gdb_xml_parse (parser, xml) == 0)
 180     /* Parsed successfully, don't need to delete the result.  */
 181     discard_cleanups (before_deleting_result);
 182
 183   do_cleanups (back_to);
 184   return data.osdata;
 185 }
 186 #endif
 187
 188 static void
 189 osdata_item_clear (struct osdata_item *item)
 190 {
 191   if (item->columns != NULL)
 192     {
 193       struct osdata_column *col;
 194       int ix;
 195       for (ix = 0;
 196            VEC_iterate (osdata_column_s, item->columns,
 197                         ix, col);
 198            ix++)
 199        {
 200          xfree (col->name);
 201          xfree (col->value);
 202        }
 203       VEC_free (osdata_column_s, item->columns);
 204       item->columns = NULL;
 205     }
 206 }
 207
 208 void
 209 osdata_free (struct osdata *osdata)
 210 {
 211   if (osdata == NULL)
 212     return;
 213
 214   if (osdata->items != NULL)
 215     {
 216       struct osdata_item *item;
 217       int ix;
 218       for (ix = 0;
 219           VEC_iterate (osdata_item_s, osdata->items,
 220                        ix, item);
 221           ix++)
 222        osdata_item_clear (item);
 223       VEC_free (osdata_item_s, osdata->items);
 224     }
 225
 226   xfree (osdata);
 227 }
 228
 229 static void
 230 osdata_free_cleanup (void *arg)
 231 {
 232   struct osdata *osdata = arg;
 233   osdata_free (osdata);
 234 }
 235
 236 struct cleanup *
 237 make_cleanup_osdata_free (struct osdata *data)
 238 {
 239   return make_cleanup (osdata_free_cleanup, data);
 240 }
 241
 242 struct osdata *
 243 get_osdata (const char *type)
 244 {
 245   struct osdata *osdata = NULL;
 246   char *xml = target_get_osdata (type);
 247   if (xml)
 248     {
 249       struct cleanup *old_chain = make_cleanup (xfree, xml);
 250
 251       if (xml[0] == '\0')
 252         warning (_("Empty data returned by target.  Wrong osdata type?"));
 253       else
 254         osdata = osdata_parse (xml);
 255
 256       do_cleanups (old_chain);
 257     }
 258
 259   if (!osdata)
 260     error (_("Can not fetch data now.\n"));
 261
 262   return osdata;
 263 }
 264
 265 const char *
 266 get_osdata_column (struct osdata_item *item, const char *name)
 267 {
 268   struct osdata_column *col;
 269   int ix_cols;
 270
 271   for (ix_cols = 0;
 272        VEC_iterate (osdata_column_s, item->columns,
 273                     ix_cols, col);
 274        ix_cols++)
 275     if (strcmp (col->name, name) == 0)
 276       return col->value;
 277
 278   return NULL;
 279 }
 280
 281 static void
 282 info_osdata_command (char *type, int from_tty)
 283 {
 284   struct osdata *osdata = NULL;
 285   struct osdata_item *last;
 286   struct cleanup *old_chain;
 287   int ncols;
 288   int nprocs;
 289
 290   if (type == 0)
 291     /* TODO: No type could mean "list availables types".  */
 292     error (_("Argument required."));
 293
 294   osdata = get_osdata (type);
 295   old_chain = make_cleanup_osdata_free (osdata);
 296
 297   nprocs = VEC_length (osdata_item_s, osdata->items);
 298
 299   last = VEC_last (osdata_item_s, osdata->items);
 300   if (last && last->columns)
 301     ncols = VEC_length (osdata_column_s, last->columns);
 302   else
 303     ncols = 0;
 304
 305   make_cleanup_ui_out_table_begin_end (uiout, ncols, nprocs,
 306                                        "OSDataTable");
 307
 308   if (last && last->columns)
 309     {
 310       struct osdata_column *col;
 311       int ix;
 312       for (ix = 0;
 313           VEC_iterate (osdata_column_s, last->columns,
 314                        ix, col);
 315           ix++)
 316        ui_out_table_header (uiout, 10, ui_left,
 317                             col->name, col->name);
 318     }
 319
 320   ui_out_table_body (uiout);
 321
 322   if (nprocs != 0)
 323     {
 324       struct osdata_item *item;
 325       int ix_items;
 326       for (ix_items = 0;
 327           VEC_iterate (osdata_item_s, osdata->items,
 328                        ix_items, item);
 329           ix_items++)
 330        {
 331          struct cleanup *old_chain;
 332          struct ui_stream *stb;
 333          int ix_cols;
 334          struct osdata_column *col;
 335
 336          stb = ui_out_stream_new (uiout);
 337          old_chain = make_cleanup_ui_out_stream_delete (stb);
 338          make_cleanup_ui_out_tuple_begin_end (uiout, "item");
 339
 340          for (ix_cols = 0;
 341               VEC_iterate (osdata_column_s, item->columns,
 342                            ix_cols, col);
 343               ix_cols++)
 344            ui_out_field_string (uiout, col->name, col->value);
 345
 346          do_cleanups (old_chain);
 347
 348          ui_out_text (uiout, "\n");
 349        }
 350     }
 351
 352   do_cleanups (old_chain);
 353 }
 354
 355 extern initialize_file_ftype _initialize_osdata; /* -Wmissing-prototypes */
 356
 357 void
 358 _initialize_osdata (void)
 359 {
 360   add_info ("os", info_osdata_command,
 361            _("Show OS data ARG."));
 362 }