gdb/osdata.c

   1 /* Routines for handling XML generic OS data provided by target.
   2
   3    Copyright (C) 2008-2017 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 "ui-out.h"
  26 #include "gdbcmd.h"
  27
  28 #if !defined(HAVE_LIBEXPAT)
  29
  30 struct osdata *
  31 osdata_parse (const char *xml)
  32 {
  33   static int have_warned;
  34
  35   if (!have_warned)
  36     {
  37       have_warned = 1;
  38       warning (_("Can not parse XML OS data; XML support was disabled "
  39                 "at compile time"));
  40     }
  41
  42   return NULL;
  43 }
  44
  45 #else /* HAVE_LIBEXPAT */
  46
  47 /* Internal parsing data passed to all XML callbacks.  */
  48 struct osdata_parsing_data
  49   {
  50     struct osdata *osdata;
  51     char *property_name;
  52   };
  53
  54 /* Handle the start of a <osdata> element.  */
  55
  56 static void
  57 osdata_start_osdata (struct gdb_xml_parser *parser,
  58                         const struct gdb_xml_element *element,
  59                         void *user_data, VEC(gdb_xml_value_s) *attributes)
  60 {
  61   struct osdata_parsing_data *data = (struct osdata_parsing_data *) user_data;
  62   char *type;
  63   struct osdata *osdata;
  64
  65   if (data->osdata)
  66     gdb_xml_error (parser, _("Seen more than on osdata element"));
  67
  68   type = (char *) xml_find_attribute (attributes, "type")->value;
  69   osdata = XCNEW (struct osdata);
  70   osdata->type = xstrdup (type);
  71   data->osdata = osdata;
  72 }
  73
  74 /* Handle the start of a <item> element.  */
  75
  76 static void
  77 osdata_start_item (struct gdb_xml_parser *parser,
  78                   const struct gdb_xml_element *element,
  79                   void *user_data, VEC(gdb_xml_value_s) *attributes)
  80 {
  81   struct osdata_parsing_data *data = (struct osdata_parsing_data *) user_data;
  82   struct osdata_item item = { NULL };
  83
  84   VEC_safe_push (osdata_item_s, data->osdata->items, &item);
  85 }
  86
  87 /* Handle the start of a <column> element.  */
  88
  89 static void
  90 osdata_start_column (struct gdb_xml_parser *parser,
  91                     const struct gdb_xml_element *element,
  92                     void *user_data, VEC(gdb_xml_value_s) *attributes)
  93 {
  94   struct osdata_parsing_data *data = (struct osdata_parsing_data *) user_data;
  95   const char *name
  96     = (const char *) xml_find_attribute (attributes, "name")->value;
  97
  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 = (struct osdata_parsing_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 = (struct osdata_parsing_data *) p;
 126
 127   osdata_free (data->osdata);
 128   data->osdata = NULL;
 129   xfree (data->property_name);
 130   data->property_name = NULL;
 131 }
 132
 133 /* The allowed elements and attributes for OS data object.
 134    The root element is a <osdata>.  */
 135
 136 const struct gdb_xml_attribute column_attributes[] = {
 137   { "name", GDB_XML_AF_NONE, NULL, NULL },
 138   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 139 };
 140
 141 const struct gdb_xml_element item_children[] = {
 142   { "column", column_attributes, NULL,
 143     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 144     osdata_start_column, osdata_end_column },
 145   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 146 };
 147
 148 const struct gdb_xml_attribute osdata_attributes[] = {
 149   { "type", GDB_XML_AF_NONE, NULL, NULL },
 150   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 151 };
 152
 153 const struct gdb_xml_element osdata_children[] = {
 154   { "item", NULL, item_children,
 155     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 156     osdata_start_item, NULL },
 157   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 158 };
 159
 160 const struct gdb_xml_element osdata_elements[] = {
 161   { "osdata", osdata_attributes, osdata_children,
 162     GDB_XML_EF_NONE, osdata_start_osdata, NULL },
 163   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 164 };
 165
 166 struct osdata *
 167 osdata_parse (const char *xml)
 168 {
 169   struct cleanup *back_to;
 170   struct osdata_parsing_data data = { NULL };
 171
 172   back_to = make_cleanup (clear_parsing_data, &data);
 173
 174   if (gdb_xml_parse_quick (_("osdata"), "osdata.dtd",
 175                            osdata_elements, xml, &data) == 0)
 176     {
 177       /* Parsed successfully, don't need to delete the result.  */
 178       discard_cleanups (back_to);
 179       return data.osdata;
 180     }
 181
 182   do_cleanups (back_to);
 183   return NULL;
 184 }
 185 #endif
 186
 187 static void
 188 osdata_item_clear (struct osdata_item *item)
 189 {
 190   if (item->columns != NULL)
 191     {
 192       struct osdata_column *col;
 193       int ix;
 194
 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
 219       for (ix = 0;
 220           VEC_iterate (osdata_item_s, osdata->items,
 221                        ix, item);
 222           ix++)
 223        osdata_item_clear (item);
 224       VEC_free (osdata_item_s, osdata->items);
 225     }
 226
 227   xfree (osdata);
 228 }
 229
 230 static void
 231 osdata_free_cleanup (void *arg)
 232 {
 233   struct osdata *osdata = (struct osdata *) arg;
 234
 235   osdata_free (osdata);
 236 }
 237
 238 struct cleanup *
 239 make_cleanup_osdata_free (struct osdata *data)
 240 {
 241   return make_cleanup (osdata_free_cleanup, data);
 242 }
 243
 244 struct osdata *
 245 get_osdata (const char *type)
 246 {
 247   struct osdata *osdata = NULL;
 248   gdb::unique_xmalloc_ptr<char> xml = target_get_osdata (type);
 249
 250   if (xml)
 251     {
 252       if (xml.get ()[0] == '\0')
 253         {
 254           if (type)
 255             warning (_("Empty data returned by target.  Wrong osdata type?"));
 256           else
 257             warning (_("Empty type list returned by target.  No type data?"));
 258         }
 259       else
 260         osdata = osdata_parse (xml.get ());
 261     }
 262
 263   if (!osdata)
 264     error (_("Can not fetch data now."));
 265
 266   return osdata;
 267 }
 268
 269 const char *
 270 get_osdata_column (struct osdata_item *item, const char *name)
 271 {
 272   struct osdata_column *col;
 273   int ix_cols;
 274
 275   for (ix_cols = 0;
 276        VEC_iterate (osdata_column_s, item->columns,
 277                     ix_cols, col);
 278        ix_cols++)
 279     if (strcmp (col->name, name) == 0)
 280       return col->value;
 281
 282   return NULL;
 283 }
 284
 285 void
 286 info_osdata (const char *type)
 287 {
 288   struct ui_out *uiout = current_uiout;
 289   struct osdata *osdata = NULL;
 290   struct osdata_item *last = NULL;
 291   struct cleanup *old_chain;
 292   int ncols = 0;
 293   int nrows;
 294   int col_to_skip = -1;
 295
 296   if (type == NULL)
 297     type = "";
 298
 299   osdata = get_osdata (type);
 300   old_chain = make_cleanup_osdata_free (osdata);
 301
 302   nrows = VEC_length (osdata_item_s, osdata->items);
 303
 304   if (*type == '\0' && nrows == 0)
 305     error (_("Available types of OS data not reported."));
 306
 307   if (!VEC_empty (osdata_item_s, osdata->items))
 308     {
 309       last = VEC_last (osdata_item_s, osdata->items);
 310       if (last->columns)
 311         ncols = VEC_length (osdata_column_s, last->columns);
 312
 313       /* As a special case, scan the listing of available data types
 314          for a column named "Title", and only include it with MI
 315          output; this column's normal use is for titles for interface
 316          elements like menus, and it clutters up CLI output.  */
 317       if (*type == '\0' && !uiout->is_mi_like_p ())
 318         {
 319           struct osdata_column *col;
 320           int ix;
 321
 322           for (ix = 0;
 323                VEC_iterate (osdata_column_s, last->columns, ix, col);
 324                ix++)
 325             {
 326               if (strcmp (col->name, "Title") == 0)
 327                 col_to_skip = ix;
 328             }
 329           /* Be sure to reduce the total column count, otherwise
 330              internal errors ensue.  */
 331           if (col_to_skip >= 0)
 332             --ncols;
 333         }
 334     }
 335
 336   ui_out_emit_table table_emitter (uiout, ncols, nrows, "OSDataTable");
 337
 338   /* With no columns/items, we just output an empty table, but we
 339      still output the table.  This matters for MI.  */
 340   if (ncols == 0)
 341     {
 342       do_cleanups (old_chain);
 343       return;
 344     }
 345
 346   if (last && last->columns)
 347     {
 348       struct osdata_column *col;
 349       int ix;
 350
 351       for (ix = 0;
 352           VEC_iterate (osdata_column_s, last->columns,
 353                        ix, col);
 354           ix++)
 355         {
 356           char col_name[32];
 357
 358           if (ix == col_to_skip)
 359             continue;
 360
 361           snprintf (col_name, 32, "col%d", ix);
 362           uiout->table_header (10, ui_left,
 363                                col_name, col->name);
 364         }
 365     }
 366
 367   uiout->table_body ();
 368
 369   if (nrows != 0)
 370     {
 371       struct osdata_item *item;
 372       int ix_items;
 373
 374       for (ix_items = 0;
 375           VEC_iterate (osdata_item_s, osdata->items,
 376                        ix_items, item);
 377           ix_items++)
 378        {
 379          int ix_cols;
 380          struct osdata_column *col;
 381
 382          {
 383            ui_out_emit_tuple tuple_emitter (uiout, "item");
 384
 385            for (ix_cols = 0;
 386                 VEC_iterate (osdata_column_s, item->columns,
 387                              ix_cols, col);
 388                 ix_cols++)
 389              {
 390                char col_name[32];
 391
 392                if (ix_cols == col_to_skip)
 393                  continue;
 394
 395                snprintf (col_name, 32, "col%d", ix_cols);
 396                uiout->field_string (col_name, col->value);
 397              }
 398          }
 399
 400          uiout->text ("\n");
 401        }
 402     }
 403
 404   do_cleanups (old_chain);
 405 }
 406
 407 static void
 408 info_osdata_command (const char *arg, int from_tty)
 409 {
 410   info_osdata (arg);
 411 }
 412
 413 void
 414 _initialize_osdata (void)
 415 {
 416   add_info ("os", info_osdata_command,
 417            _("Show OS data ARG."));
 418 }