gdb/mi/mi-cmd-var.c

   1 /* MI Command Set - varobj commands.
   2
   3    Copyright 2000, 2002 Free Software Foundation, Inc.
   4
   5    Contributed by Cygnus Solutions (a Red Hat company).
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, USA.  */
  23
  24 #include "defs.h"
  25 #include "mi-cmds.h"
  26 #include "ui-out.h"
  27 #include "mi-out.h"
  28 #include "varobj.h"
  29 #include "value.h"
  30 #include <ctype.h>
  31 #include "gdb_string.h"
  32
  33 extern int varobjdebug;         /* defined in varobj.c */
  34
  35 static int varobj_update_one (struct varobj *var);
  36
  37 /* VAROBJ operations */
  38
  39 enum mi_cmd_result
  40 mi_cmd_var_create (char *command, char **argv, int argc)
  41 {
  42   CORE_ADDR frameaddr = 0;
  43   struct varobj *var;
  44   char *name;
  45   char *frame;
  46   char *expr;
  47   char *type;
  48   struct cleanup *old_cleanups;
  49   enum varobj_type var_type;
  50
  51   if (argc != 3)
  52     {
  53       /*      xasprintf (&mi_error_message,
  54          "mi_cmd_var_create: Usage: .");
  55          return MI_CMD_ERROR; */
  56       error ("mi_cmd_var_create: Usage: NAME FRAME EXPRESSION.");
  57     }
  58
  59   name = xstrdup (argv[0]);
  60   /* Add cleanup for name. Must be free_current_contents as
  61      name can be reallocated */
  62   old_cleanups = make_cleanup (free_current_contents, &name);
  63
  64   frame = xstrdup (argv[1]);
  65   old_cleanups = make_cleanup (xfree, frame);
  66
  67   expr = xstrdup (argv[2]);
  68
  69   if (strcmp (name, "-") == 0)
  70     {
  71       xfree (name);
  72       name = varobj_gen_name ();
  73     }
  74   else if (!isalpha (*name))
  75     error ("mi_cmd_var_create: name of object must begin with a letter");
  76
  77   if (strcmp (frame, "*") == 0)
  78     var_type = USE_CURRENT_FRAME;
  79   else if (strcmp (frame, "@") == 0)
  80     var_type = USE_SELECTED_FRAME;
  81   else
  82     {
  83       var_type = USE_SPECIFIED_FRAME;
  84       frameaddr = parse_and_eval_address (frame);
  85     }
  86
  87   if (varobjdebug)
  88     fprintf_unfiltered (gdb_stdlog,
  89                     "Name=\"%s\", Frame=\"%s\" (0x%s), Expression=\"%s\"\n",
  90                         name, frame, paddr (frameaddr), expr);
  91
  92   var = varobj_create (name, expr, frameaddr, var_type);
  93
  94   if (var == NULL)
  95     error ("mi_cmd_var_create: unable to create variable object");
  96
  97   ui_out_field_string (uiout, "name", name);
  98   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
  99   type = varobj_get_type (var);
 100   if (type == NULL)
 101     ui_out_field_string (uiout, "type", "");
 102   else
 103     {
 104       ui_out_field_string (uiout, "type", type);
 105       xfree (type);
 106     }
 107
 108   do_cleanups (old_cleanups);
 109   return MI_CMD_DONE;
 110 }
 111
 112 enum mi_cmd_result
 113 mi_cmd_var_delete (char *command, char **argv, int argc)
 114 {
 115   char *name;
 116   char *expr;
 117   struct varobj *var;
 118   int numdel;
 119   int children_only_p = 0;
 120   struct cleanup *old_cleanups;
 121
 122   if (argc < 1 || argc > 2)
 123     error ("mi_cmd_var_delete: Usage: [-c] EXPRESSION.");
 124
 125   name = xstrdup (argv[0]);
 126   /* Add cleanup for name. Must be free_current_contents as
 127      name can be reallocated */
 128   old_cleanups = make_cleanup (free_current_contents, &name);
 129
 130   /* If we have one single argument it cannot be '-c' or any string
 131      starting with '-'. */
 132   if (argc == 1)
 133     {
 134       if (strcmp (name, "-c") == 0)
 135         error ("mi_cmd_var_delete: Missing required argument after '-c': variable object name");
 136       if (*name == '-')
 137         error ("mi_cmd_var_delete: Illegal variable object name");
 138     }
 139
 140   /* If we have 2 arguments they must be '-c' followed by a string
 141      which would be the variable name. */
 142   if (argc == 2)
 143     {
 144       expr = xstrdup (argv[1]);
 145       if (strcmp (name, "-c") != 0)
 146         error ("mi_cmd_var_delete: Invalid option.");
 147       children_only_p = 1;
 148       xfree (name);
 149       name = xstrdup (expr);
 150       xfree (expr);
 151     }
 152
 153   /* If we didn't error out, now NAME contains the name of the
 154      variable. */
 155
 156   var = varobj_get_handle (name);
 157
 158   if (var == NULL)
 159     error ("mi_cmd_var_delete: Variable object not found.");
 160
 161   numdel = varobj_delete (var, NULL, children_only_p);
 162
 163   ui_out_field_int (uiout, "ndeleted", numdel);
 164
 165   do_cleanups (old_cleanups);
 166   return MI_CMD_DONE;
 167 }
 168
 169 enum mi_cmd_result
 170 mi_cmd_var_set_format (char *command, char **argv, int argc)
 171 {
 172   enum varobj_display_formats format;
 173   int len;
 174   struct varobj *var;
 175   char *formspec;
 176
 177   if (argc != 2)
 178     error ("mi_cmd_var_set_format: Usage: NAME FORMAT.");
 179
 180   /* Get varobj handle, if a valid var obj name was specified */
 181   var = varobj_get_handle (argv[0]);
 182
 183   if (var == NULL)
 184     error ("mi_cmd_var_set_format: Variable object not found");
 185
 186   formspec = xstrdup (argv[1]);
 187   if (formspec == NULL)
 188     error ("mi_cmd_var_set_format: Must specify the format as: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\"");
 189
 190   len = strlen (formspec);
 191
 192   if (STREQN (formspec, "natural", len))
 193     format = FORMAT_NATURAL;
 194   else if (STREQN (formspec, "binary", len))
 195     format = FORMAT_BINARY;
 196   else if (STREQN (formspec, "decimal", len))
 197     format = FORMAT_DECIMAL;
 198   else if (STREQN (formspec, "hexadecimal", len))
 199     format = FORMAT_HEXADECIMAL;
 200   else if (STREQN (formspec, "octal", len))
 201     format = FORMAT_OCTAL;
 202   else
 203     error ("mi_cmd_var_set_format: Unknown display format: must be: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\"");
 204
 205   /* Set the format of VAR to given format */
 206   varobj_set_display_format (var, format);
 207
 208   /* Report the new current format */
 209   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 210   return MI_CMD_DONE;
 211 }
 212
 213 enum mi_cmd_result
 214 mi_cmd_var_show_format (char *command, char **argv, int argc)
 215 {
 216   enum varobj_display_formats format;
 217   struct varobj *var;
 218
 219   if (argc != 1)
 220     error ("mi_cmd_var_show_format: Usage: NAME.");
 221
 222   /* Get varobj handle, if a valid var obj name was specified */
 223   var = varobj_get_handle (argv[0]);
 224   if (var == NULL)
 225     error ("mi_cmd_var_show_format: Variable object not found");
 226
 227   format = varobj_get_display_format (var);
 228
 229   /* Report the current format */
 230   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 231   return MI_CMD_DONE;
 232 }
 233
 234 enum mi_cmd_result
 235 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 236 {
 237   struct varobj *var;
 238
 239   if (argc != 1)
 240     error ("mi_cmd_var_info_num_children: Usage: NAME.");
 241
 242   /* Get varobj handle, if a valid var obj name was specified */
 243   var = varobj_get_handle (argv[0]);
 244   if (var == NULL)
 245     error ("mi_cmd_var_info_num_children: Variable object not found");
 246
 247   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 248   return MI_CMD_DONE;
 249 }
 250
 251 enum mi_cmd_result
 252 mi_cmd_var_list_children (char *command, char **argv, int argc)
 253 {
 254   struct varobj *var;
 255   struct varobj **childlist;
 256   struct varobj **cc;
 257   int numchild;
 258   char *type;
 259
 260   if (argc != 1)
 261     error ("mi_cmd_var_list_children: Usage: NAME.");
 262
 263   /* Get varobj handle, if a valid var obj name was specified */
 264   var = varobj_get_handle (argv[0]);
 265   if (var == NULL)
 266     error ("mi_cmd_var_list_children: Variable object not found");
 267
 268   numchild = varobj_list_children (var, &childlist);
 269   ui_out_field_int (uiout, "numchild", numchild);
 270
 271   if (numchild <= 0)
 272     return MI_CMD_DONE;
 273
 274   ui_out_tuple_begin (uiout, "children");
 275   cc = childlist;
 276   while (*cc != NULL)
 277     {
 278       ui_out_tuple_begin (uiout, "child");
 279       ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 280       ui_out_field_string (uiout, "exp", varobj_get_expression (*cc));
 281       ui_out_field_int (uiout, "numchild", varobj_get_num_children (*cc));
 282       type = varobj_get_type (*cc);
 283       /* C++ pseudo-variables (public, private, protected) do not have a type */
 284       if (type)
 285         ui_out_field_string (uiout, "type", varobj_get_type (*cc));
 286       ui_out_tuple_end (uiout);
 287       cc++;
 288     }
 289   ui_out_tuple_end (uiout);
 290   xfree (childlist);
 291   return MI_CMD_DONE;
 292 }
 293
 294 enum mi_cmd_result
 295 mi_cmd_var_info_type (char *command, char **argv, int argc)
 296 {
 297   struct varobj *var;
 298
 299   if (argc != 1)
 300     error ("mi_cmd_var_info_type: Usage: NAME.");
 301
 302   /* Get varobj handle, if a valid var obj name was specified */
 303   var = varobj_get_handle (argv[0]);
 304   if (var == NULL)
 305     error ("mi_cmd_var_info_type: Variable object not found");
 306
 307   ui_out_field_string (uiout, "type", varobj_get_type (var));
 308   return MI_CMD_DONE;
 309 }
 310
 311 enum mi_cmd_result
 312 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 313 {
 314   enum varobj_languages lang;
 315   struct varobj *var;
 316
 317   if (argc != 1)
 318     error ("mi_cmd_var_info_expression: Usage: NAME.");
 319
 320   /* Get varobj handle, if a valid var obj name was specified */
 321   var = varobj_get_handle (argv[0]);
 322   if (var == NULL)
 323     error ("mi_cmd_var_info_expression: Variable object not found");
 324
 325   lang = varobj_get_language (var);
 326
 327   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 328   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 329   return MI_CMD_DONE;
 330 }
 331
 332 enum mi_cmd_result
 333 mi_cmd_var_show_attributes (char *command, char **argv, int argc)
 334 {
 335   int attr;
 336   char *attstr;
 337   struct varobj *var;
 338
 339   if (argc != 1)
 340     error ("mi_cmd_var_show_attributes: Usage: NAME.");
 341
 342   /* Get varobj handle, if a valid var obj name was specified */
 343   var = varobj_get_handle (argv[0]);
 344   if (var == NULL)
 345     error ("mi_cmd_var_show_attributes: Variable object not found");
 346
 347   attr = varobj_get_attributes (var);
 348   /* FIXME: define masks for attributes */
 349   if (attr & 0x00000001)
 350     attstr = "editable";
 351   else
 352     attstr = "noneditable";
 353
 354   ui_out_field_string (uiout, "attr", attstr);
 355   return MI_CMD_DONE;
 356 }
 357
 358 enum mi_cmd_result
 359 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 360 {
 361   struct varobj *var;
 362
 363   if (argc != 1)
 364     error ("mi_cmd_var_evaluate_expression: Usage: NAME.");
 365
 366   /* Get varobj handle, if a valid var obj name was specified */
 367   var = varobj_get_handle (argv[0]);
 368   if (var == NULL)
 369     error ("mi_cmd_var_evaluate_expression: Variable object not found");
 370
 371   ui_out_field_string (uiout, "value", varobj_get_value (var));
 372   return MI_CMD_DONE;
 373 }
 374
 375 enum mi_cmd_result
 376 mi_cmd_var_assign (char *command, char **argv, int argc)
 377 {
 378   struct varobj *var;
 379   char *expression;
 380
 381   if (argc != 2)
 382     error ("mi_cmd_var_assign: Usage: NAME EXPRESSION.");
 383
 384   /* Get varobj handle, if a valid var obj name was specified */
 385   var = varobj_get_handle (argv[0]);
 386   if (var == NULL)
 387     error ("mi_cmd_var_assign: Variable object not found");
 388
 389   /* FIXME: define masks for attributes */
 390   if (!(varobj_get_attributes (var) & 0x00000001))
 391     error ("mi_cmd_var_assign: Variable object is not editable");
 392
 393   expression = xstrdup (argv[1]);
 394
 395   if (!varobj_set_value (var, expression))
 396     error ("mi_cmd_var_assign: Could not assign expression to varible object");
 397
 398   ui_out_field_string (uiout, "value", varobj_get_value (var));
 399   return MI_CMD_DONE;
 400 }
 401
 402 enum mi_cmd_result
 403 mi_cmd_var_update (char *command, char **argv, int argc)
 404 {
 405   struct varobj *var;
 406   struct varobj **rootlist;
 407   struct varobj **cr;
 408   struct cleanup *cleanup;
 409   char *name;
 410   int nv;
 411
 412   if (argc != 1)
 413     error ("mi_cmd_var_update: Usage: NAME.");
 414
 415   name = argv[0];
 416
 417   /* Check if the parameter is a "*" which means that we want
 418      to update all variables */
 419
 420   if ((*name == '*') && (*(name + 1) == '\0'))
 421     {
 422       nv = varobj_list (&rootlist);
 423       if (mi_version (uiout) <= 1)
 424         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 425       else
 426         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 427       if (nv <= 0)
 428         {
 429           do_cleanups (cleanup);
 430           return MI_CMD_DONE;
 431         }
 432       cr = rootlist;
 433       while (*cr != NULL)
 434         {
 435           varobj_update_one (*cr);
 436           cr++;
 437         }
 438       xfree (rootlist);
 439       do_cleanups (cleanup);
 440     }
 441   else
 442     {
 443       /* Get varobj handle, if a valid var obj name was specified */
 444       var = varobj_get_handle (name);
 445       if (var == NULL)
 446         error ("mi_cmd_var_update: Variable object not found");
 447
 448       if (mi_version (uiout) <= 1)
 449         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 450       else
 451         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 452       varobj_update_one (var);
 453       do_cleanups (cleanup);
 454     }
 455     return MI_CMD_DONE;
 456 }
 457
 458 /* Helper for mi_cmd_var_update() Returns 0 if the update for
 459    the variable fails (usually because the variable is out of
 460    scope), and 1 if it succeeds. */
 461
 462 static int
 463 varobj_update_one (struct varobj *var)
 464 {
 465   struct varobj **changelist;
 466   struct varobj **cc;
 467   struct cleanup *cleanup = NULL;
 468   int nc;
 469
 470   nc = varobj_update (&var, &changelist);
 471
 472   /* nc == 0 means that nothing has changed.
 473      nc == -1 means that an error occured in updating the variable.
 474      nc == -2 means the variable has changed type. */
 475
 476   if (nc == 0)
 477     return 1;
 478   else if (nc == -1)
 479     {
 480       if (mi_version (uiout) > 1)
 481         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 482       ui_out_field_string (uiout, "name", varobj_get_objname(var));
 483       ui_out_field_string (uiout, "in_scope", "false");
 484       if (mi_version (uiout) > 1)
 485         do_cleanups (cleanup);
 486       return -1;
 487     }
 488   else if (nc == -2)
 489     {
 490       if (mi_version (uiout) > 1)
 491         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 492       ui_out_field_string (uiout, "name", varobj_get_objname (var));
 493       ui_out_field_string (uiout, "in_scope", "true");
 494       ui_out_field_string (uiout, "new_type", varobj_get_type(var));
 495       ui_out_field_int (uiout, "new_num_children",
 496                            varobj_get_num_children(var));
 497       if (mi_version (uiout) > 1)
 498         do_cleanups (cleanup);
 499     }
 500   else
 501     {
 502
 503       cc = changelist;
 504       while (*cc != NULL)
 505         {
 506           if (mi_version (uiout) > 1)
 507             cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 508           ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 509           ui_out_field_string (uiout, "in_scope", "true");
 510           ui_out_field_string (uiout, "type_changed", "false");
 511           if (mi_version (uiout) > 1)
 512             do_cleanups (cleanup);
 513           cc++;
 514         }
 515       xfree (changelist);
 516       return 1;
 517     }
 518   return 1;
 519 }