gdb/osdata.c

   1 /* Routines for handling XML generic OS data provided by target.
   2
   3    Copyright (C) 2008, 2009, 2010 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
  87   VEC_safe_push (osdata_item_s, data->osdata->items, &item);
  88 }
  89
  90 /* Handle the start of a <column> element.  */
  91
  92 static void
  93 osdata_start_column (struct gdb_xml_parser *parser,
  94                     const struct gdb_xml_element *element,
  95                     void *user_data, VEC(gdb_xml_value_s) *attributes)
  96 {
  97   struct osdata_parsing_data *data = user_data;
  98   const char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value;
  99
 100   data->property_name = xstrdup (name);
 101 }
 102
 103 /* Handle the end of a <column> element.  */
 104
 105 static void
 106 osdata_end_column (struct gdb_xml_parser *parser,
 107                   const struct gdb_xml_element *element,
 108                   void *user_data, const char *body_text)
 109 {
 110   struct osdata_parsing_data *data = user_data;
 111   struct osdata *osdata = data->osdata;
 112   struct osdata_item *item = VEC_last (osdata_item_s, osdata->items);
 113   struct osdata_column *col = VEC_safe_push (osdata_column_s,
 114                                             item->columns, NULL);
 115
 116   /* Transfer memory ownership.  NAME was already strdup'ed.  */
 117   col->name = data->property_name;
 118   col->value = xstrdup (body_text);
 119   data->property_name = NULL;
 120 }
 121
 122 /* Discard the constructed osdata (if an error occurs).  */
 123
 124 static void
 125 clear_parsing_data (void *p)
 126 {
 127   struct osdata_parsing_data *data = p;
 128
 129   osdata_free (data->osdata);
 130   data->osdata = NULL;
 131   xfree (data->property_name);
 132   data->property_name = NULL;
 133 }
 134
 135 /* The allowed elements and attributes for OS data object.
 136    The root element is a <osdata>.  */
 137
 138 const struct gdb_xml_attribute column_attributes[] = {
 139   { "name", GDB_XML_AF_NONE, NULL, NULL },
 140   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 141 };
 142
 143 const struct gdb_xml_element item_children[] = {
 144   { "column", column_attributes, NULL,
 145     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 146     osdata_start_column, osdata_end_column },
 147   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 148 };
 149
 150 const struct gdb_xml_attribute osdata_attributes[] = {
 151   { "type", GDB_XML_AF_NONE, NULL, NULL },
 152   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 153 };
 154
 155 const struct gdb_xml_element osdata_children[] = {
 156   { "item", NULL, item_children,
 157     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 158     osdata_start_item, NULL },
 159   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 160 };
 161
 162 const struct gdb_xml_element osdata_elements[] = {
 163   { "osdata", osdata_attributes, osdata_children,
 164     GDB_XML_EF_NONE, osdata_start_osdata, NULL },
 165   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 166 };
 167
 168 struct osdata *
 169 osdata_parse (const char *xml)
 170 {
 171   struct gdb_xml_parser *parser;
 172   struct cleanup *before_deleting_result, *back_to;
 173   struct osdata_parsing_data data = { NULL };
 174
 175   back_to = make_cleanup (null_cleanup, NULL);
 176   parser = gdb_xml_create_parser_and_cleanup (_("osdata"),
 177                                              osdata_elements, &data);
 178   gdb_xml_use_dtd (parser, "osdata.dtd");
 179
 180   before_deleting_result = make_cleanup (clear_parsing_data, &data);
 181
 182   if (gdb_xml_parse (parser, xml) == 0)
 183     /* Parsed successfully, don't need to delete the result.  */
 184     discard_cleanups (before_deleting_result);
 185
 186   do_cleanups (back_to);
 187   return data.osdata;
 188 }
 189 #endif
 190
 191 static void
 192 osdata_item_clear (struct osdata_item *item)
 193 {
 194   if (item->columns != NULL)
 195     {
 196       struct osdata_column *col;
 197       int ix;
 198
 199       for (ix = 0;
 200            VEC_iterate (osdata_column_s, item->columns,
 201                         ix, col);
 202            ix++)
 203        {
 204          xfree (col->name);
 205          xfree (col->value);
 206        }
 207       VEC_free (osdata_column_s, item->columns);
 208       item->columns = NULL;
 209     }
 210 }
 211
 212 void
 213 osdata_free (struct osdata *osdata)
 214 {
 215   if (osdata == NULL)
 216     return;
 217
 218   if (osdata->items != NULL)
 219     {
 220       struct osdata_item *item;
 221       int ix;
 222
 223       for (ix = 0;
 224           VEC_iterate (osdata_item_s, osdata->items,
 225                        ix, item);
 226           ix++)
 227        osdata_item_clear (item);
 228       VEC_free (osdata_item_s, osdata->items);
 229     }
 230
 231   xfree (osdata);
 232 }
 233
 234 static void
 235 osdata_free_cleanup (void *arg)
 236 {
 237   struct osdata *osdata = arg;
 238
 239   osdata_free (osdata);
 240 }
 241
 242 struct cleanup *
 243 make_cleanup_osdata_free (struct osdata *data)
 244 {
 245   return make_cleanup (osdata_free_cleanup, data);
 246 }
 247
 248 struct osdata *
 249 get_osdata (const char *type)
 250 {
 251   struct osdata *osdata = NULL;
 252   char *xml = target_get_osdata (type);
 253
 254   if (xml)
 255     {
 256       struct cleanup *old_chain = make_cleanup (xfree, xml);
 257
 258       if (xml[0] == '\0')
 259         warning (_("Empty data returned by target.  Wrong osdata type?"));
 260       else
 261         osdata = osdata_parse (xml);
 262
 263       do_cleanups (old_chain);
 264     }
 265
 266   if (!osdata)
 267     error (_("Can not fetch data now.\n"));
 268
 269   return osdata;
 270 }
 271
 272 const char *
 273 get_osdata_column (struct osdata_item *item, const char *name)
 274 {
 275   struct osdata_column *col;
 276   int ix_cols;
 277
 278   for (ix_cols = 0;
 279        VEC_iterate (osdata_column_s, item->columns,
 280                     ix_cols, col);
 281        ix_cols++)
 282     if (strcmp (col->name, name) == 0)
 283       return col->value;
 284
 285   return NULL;
 286 }
 287
 288 static void
 289 info_osdata_command (char *type, int from_tty)
 290 {
 291   struct osdata *osdata = NULL;
 292   struct osdata_item *last;
 293   struct cleanup *old_chain;
 294   int ncols;
 295   int nprocs;
 296
 297   if (type == 0)
 298     /* TODO: No type could mean "list availables types".  */
 299     error (_("Argument required."));
 300
 301   osdata = get_osdata (type);
 302   old_chain = make_cleanup_osdata_free (osdata);
 303
 304   nprocs = VEC_length (osdata_item_s, osdata->items);
 305
 306   last = VEC_last (osdata_item_s, osdata->items);
 307   if (last && last->columns)
 308     ncols = VEC_length (osdata_column_s, last->columns);
 309   else
 310     ncols = 0;
 311
 312   make_cleanup_ui_out_table_begin_end (uiout, ncols, nprocs,
 313                                        "OSDataTable");
 314
 315   if (last && last->columns)
 316     {
 317       struct osdata_column *col;
 318       int ix;
 319
 320       for (ix = 0;
 321           VEC_iterate (osdata_column_s, last->columns,
 322                        ix, col);
 323           ix++)
 324        ui_out_table_header (uiout, 10, ui_left,
 325                             col->name, col->name);
 326     }
 327
 328   ui_out_table_body (uiout);
 329
 330   if (nprocs != 0)
 331     {
 332       struct osdata_item *item;
 333       int ix_items;
 334
 335       for (ix_items = 0;
 336           VEC_iterate (osdata_item_s, osdata->items,
 337                        ix_items, item);
 338           ix_items++)
 339        {
 340          struct cleanup *old_chain;
 341          struct ui_stream *stb;
 342          int ix_cols;
 343          struct osdata_column *col;
 344
 345          stb = ui_out_stream_new (uiout);
 346          old_chain = make_cleanup_ui_out_stream_delete (stb);
 347          make_cleanup_ui_out_tuple_begin_end (uiout, "item");
 348
 349          for (ix_cols = 0;
 350               VEC_iterate (osdata_column_s, item->columns,
 351                            ix_cols, col);
 352               ix_cols++)
 353            ui_out_field_string (uiout, col->name, col->value);
 354
 355          do_cleanups (old_chain);
 356
 357          ui_out_text (uiout, "\n");
 358        }
 359     }
 360
 361   do_cleanups (old_chain);
 362 }
 363
 364 extern initialize_file_ftype _initialize_osdata; /* -Wmissing-prototypes */
 365
 366 void
 367 _initialize_osdata (void)
 368 {
 369   add_info ("os", info_osdata_command,
 370            _("Show OS data ARG."));
 371 }