gdb/mi/mi-cmd-var.c

   1 /* MI Command Set - varobj commands.
   2    Copyright (C) 2000-2017 Free Software Foundation, Inc.
   3
   4    Contributed by Cygnus Solutions (a Red Hat company).
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "mi-cmds.h"
  23 #include "mi-main.h"
  24 #include "ui-out.h"
  25 #include "mi-out.h"
  26 #include "varobj.h"
  27 #include "language.h"
  28 #include "value.h"
  29 #include <ctype.h>
  30 #include "mi-getopt.h"
  31 #include "gdbthread.h"
  32 #include "mi-parse.h"
  33 #include "common/gdb_optional.h"
  34
  35 extern unsigned int varobjdebug;                /* defined in varobj.c.  */
  36
  37 static void varobj_update_one (struct varobj *var,
  38                                enum print_values print_values,
  39                                int is_explicit);
  40
  41 static int mi_print_value_p (struct varobj *var,
  42                              enum print_values print_values);
  43
  44 /* Print variable object VAR.  The PRINT_VALUES parameter controls
  45    if the value should be printed.  The PRINT_EXPRESSION parameter
  46    controls if the expression should be printed.  */
  47
  48 static void
  49 print_varobj (struct varobj *var, enum print_values print_values,
  50               int print_expression)
  51 {
  52   struct ui_out *uiout = current_uiout;
  53   int thread_id;
  54
  55   uiout->field_string ("name", varobj_get_objname (var));
  56   if (print_expression)
  57     {
  58       std::string exp = varobj_get_expression (var);
  59
  60       uiout->field_string ("exp", exp.c_str ());
  61     }
  62   uiout->field_int ("numchild", varobj_get_num_children (var));
  63
  64   if (mi_print_value_p (var, print_values))
  65     {
  66       std::string val = varobj_get_value (var);
  67
  68       uiout->field_string ("value", val.c_str ());
  69     }
  70
  71   std::string type = varobj_get_type (var);
  72   if (!type.empty ())
  73     uiout->field_string ("type", type.c_str ());
  74
  75   thread_id = varobj_get_thread_id (var);
  76   if (thread_id > 0)
  77     uiout->field_int ("thread-id", thread_id);
  78
  79   if (varobj_get_frozen (var))
  80     uiout->field_int ("frozen", 1);
  81
  82   gdb::unique_xmalloc_ptr<char> display_hint = varobj_get_display_hint (var);
  83   if (display_hint)
  84     uiout->field_string ("displayhint", display_hint.get ());
  85
  86   if (varobj_is_dynamic_p (var))
  87     uiout->field_int ("dynamic", 1);
  88 }
  89
  90 /* VAROBJ operations */
  91
  92 void
  93 mi_cmd_var_create (const char *command, char **argv, int argc)
  94 {
  95   struct ui_out *uiout = current_uiout;
  96   CORE_ADDR frameaddr = 0;
  97   struct varobj *var;
  98   char *frame;
  99   char *expr;
 100   enum varobj_type var_type;
 101
 102   if (argc != 3)
 103     error (_("-var-create: Usage: NAME FRAME EXPRESSION."));
 104
 105   frame = argv[1];
 106   expr = argv[2];
 107
 108   const char *name = argv[0];
 109   std::string gen_name;
 110   if (strcmp (name, "-") == 0)
 111     {
 112       gen_name = varobj_gen_name ();
 113       name = gen_name.c_str ();
 114     }
 115   else if (!isalpha (name[0]))
 116     error (_("-var-create: name of object must begin with a letter"));
 117
 118   if (strcmp (frame, "*") == 0)
 119     var_type = USE_CURRENT_FRAME;
 120   else if (strcmp (frame, "@") == 0)
 121     var_type = USE_SELECTED_FRAME;
 122   else
 123     {
 124       var_type = USE_SPECIFIED_FRAME;
 125       frameaddr = string_to_core_addr (frame);
 126     }
 127
 128   if (varobjdebug)
 129     fprintf_unfiltered (gdb_stdlog,
 130                         "Name=\"%s\", Frame=\"%s\" (%s), Expression=\"%s\"\n",
 131                         name, frame, hex_string (frameaddr), expr);
 132
 133   var = varobj_create (name, expr, frameaddr, var_type);
 134
 135   if (var == NULL)
 136     error (_("-var-create: unable to create variable object"));
 137
 138   print_varobj (var, PRINT_ALL_VALUES, 0 /* don't print expression */);
 139
 140   uiout->field_int ("has_more", varobj_has_more (var, 0));
 141 }
 142
 143 void
 144 mi_cmd_var_delete (const char *command, char **argv, int argc)
 145 {
 146   char *name;
 147   struct varobj *var;
 148   int numdel;
 149   int children_only_p = 0;
 150   struct ui_out *uiout = current_uiout;
 151
 152   if (argc < 1 || argc > 2)
 153     error (_("-var-delete: Usage: [-c] EXPRESSION."));
 154
 155   name = argv[0];
 156
 157   /* If we have one single argument it cannot be '-c' or any string
 158      starting with '-'.  */
 159   if (argc == 1)
 160     {
 161       if (strcmp (name, "-c") == 0)
 162         error (_("-var-delete: Missing required "
 163                  "argument after '-c': variable object name"));
 164       if (*name == '-')
 165         error (_("-var-delete: Illegal variable object name"));
 166     }
 167
 168   /* If we have 2 arguments they must be '-c' followed by a string
 169      which would be the variable name.  */
 170   if (argc == 2)
 171     {
 172       if (strcmp (name, "-c") != 0)
 173         error (_("-var-delete: Invalid option."));
 174       children_only_p = 1;
 175       name = argv[1];
 176     }
 177
 178   /* If we didn't error out, now NAME contains the name of the
 179      variable.  */
 180
 181   var = varobj_get_handle (name);
 182
 183   numdel = varobj_delete (var, children_only_p);
 184
 185   uiout->field_int ("ndeleted", numdel);
 186 }
 187
 188 /* Parse a string argument into a format value.  */
 189
 190 static enum varobj_display_formats
 191 mi_parse_format (const char *arg)
 192 {
 193   if (arg != NULL)
 194     {
 195       int len;
 196
 197       len = strlen (arg);
 198
 199       if (strncmp (arg, "natural", len) == 0)
 200         return FORMAT_NATURAL;
 201       else if (strncmp (arg, "binary", len) == 0)
 202         return FORMAT_BINARY;
 203       else if (strncmp (arg, "decimal", len) == 0)
 204         return FORMAT_DECIMAL;
 205       else if (strncmp (arg, "hexadecimal", len) == 0)
 206         return FORMAT_HEXADECIMAL;
 207       else if (strncmp (arg, "octal", len) == 0)
 208         return FORMAT_OCTAL;
 209       else if (strncmp (arg, "zero-hexadecimal", len) == 0)
 210         return FORMAT_ZHEXADECIMAL;
 211     }
 212
 213   error (_("Must specify the format as: \"natural\", "
 214            "\"binary\", \"decimal\", \"hexadecimal\", \"octal\" or \"zero-hexadecimal\""));
 215 }
 216
 217 void
 218 mi_cmd_var_set_format (const char *command, char **argv, int argc)
 219 {
 220   enum varobj_display_formats format;
 221   struct varobj *var;
 222   struct ui_out *uiout = current_uiout;
 223
 224   if (argc != 2)
 225     error (_("-var-set-format: Usage: NAME FORMAT."));
 226
 227   /* Get varobj handle, if a valid var obj name was specified.  */
 228   var = varobj_get_handle (argv[0]);
 229
 230   format = mi_parse_format (argv[1]);
 231
 232   /* Set the format of VAR to the given format.  */
 233   varobj_set_display_format (var, format);
 234
 235   /* Report the new current format.  */
 236   uiout->field_string ("format", varobj_format_string[(int) format]);
 237
 238   /* Report the value in the new format.  */
 239   std::string val = varobj_get_value (var);
 240   uiout->field_string ("value", val.c_str ());
 241 }
 242
 243 void
 244 mi_cmd_var_set_visualizer (const char *command, char **argv, int argc)
 245 {
 246   struct varobj *var;
 247
 248   if (argc != 2)
 249     error (_("Usage: NAME VISUALIZER_FUNCTION."));
 250
 251   var = varobj_get_handle (argv[0]);
 252
 253   if (var == NULL)
 254     error (_("Variable object not found"));
 255
 256   varobj_set_visualizer (var, argv[1]);
 257 }
 258
 259 void
 260 mi_cmd_var_set_frozen (const char *command, char **argv, int argc)
 261 {
 262   struct varobj *var;
 263   int frozen;
 264
 265   if (argc != 2)
 266     error (_("-var-set-format: Usage: NAME FROZEN_FLAG."));
 267
 268   var = varobj_get_handle (argv[0]);
 269
 270   if (strcmp (argv[1], "0") == 0)
 271     frozen = 0;
 272   else if (strcmp (argv[1], "1") == 0)
 273     frozen = 1;
 274   else
 275     error (_("Invalid flag value"));
 276
 277   varobj_set_frozen (var, frozen);
 278
 279   /* We don't automatically return the new value, or what varobjs got
 280      new values during unfreezing.  If this information is required,
 281      client should call -var-update explicitly.  */
 282 }
 283
 284 void
 285 mi_cmd_var_show_format (const char *command, char **argv, int argc)
 286 {
 287   struct ui_out *uiout = current_uiout;
 288   enum varobj_display_formats format;
 289   struct varobj *var;
 290
 291   if (argc != 1)
 292     error (_("-var-show-format: Usage: NAME."));
 293
 294   /* Get varobj handle, if a valid var obj name was specified.  */
 295   var = varobj_get_handle (argv[0]);
 296
 297   format = varobj_get_display_format (var);
 298
 299   /* Report the current format.  */
 300   uiout->field_string ("format", varobj_format_string[(int) format]);
 301 }
 302
 303 void
 304 mi_cmd_var_info_num_children (const char *command, char **argv, int argc)
 305 {
 306   struct ui_out *uiout = current_uiout;
 307   struct varobj *var;
 308
 309   if (argc != 1)
 310     error (_("-var-info-num-children: Usage: NAME."));
 311
 312   /* Get varobj handle, if a valid var obj name was specified.  */
 313   var = varobj_get_handle (argv[0]);
 314
 315   uiout->field_int ("numchild", varobj_get_num_children (var));
 316 }
 317
 318 /* Return 1 if given the argument PRINT_VALUES we should display
 319    the varobj VAR.  */
 320
 321 static int
 322 mi_print_value_p (struct varobj *var, enum print_values print_values)
 323 {
 324   struct type *type;
 325
 326   if (print_values == PRINT_NO_VALUES)
 327     return 0;
 328
 329   if (print_values == PRINT_ALL_VALUES)
 330     return 1;
 331
 332   if (varobj_is_dynamic_p (var))
 333     return 1;
 334
 335   type = varobj_get_gdb_type (var);
 336   if (type == NULL)
 337     return 1;
 338   else
 339     {
 340       type = check_typedef (type);
 341
 342       /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 343          and that type is not a compound type.  */
 344       return (TYPE_CODE (type) != TYPE_CODE_ARRAY
 345               && TYPE_CODE (type) != TYPE_CODE_STRUCT
 346               && TYPE_CODE (type) != TYPE_CODE_UNION);
 347     }
 348 }
 349
 350 void
 351 mi_cmd_var_list_children (const char *command, char **argv, int argc)
 352 {
 353   struct ui_out *uiout = current_uiout;
 354   struct varobj *var;
 355   enum print_values print_values;
 356   int from, to;
 357
 358   if (argc < 1 || argc > 4)
 359     error (_("-var-list-children: Usage: "
 360              "[PRINT_VALUES] NAME [FROM TO]"));
 361
 362   /* Get varobj handle, if a valid var obj name was specified.  */
 363   if (argc == 1 || argc == 3)
 364     var = varobj_get_handle (argv[0]);
 365   else
 366     var = varobj_get_handle (argv[1]);
 367
 368   if (argc > 2)
 369     {
 370       from = atoi (argv[argc - 2]);
 371       to = atoi (argv[argc - 1]);
 372     }
 373   else
 374     {
 375       from = -1;
 376       to = -1;
 377     }
 378
 379   const std::vector<varobj *> &children
 380     = varobj_list_children (var, &from, &to);
 381
 382   uiout->field_int ("numchild", to - from);
 383   if (argc == 2 || argc == 4)
 384     print_values = mi_parse_print_values (argv[0]);
 385   else
 386     print_values = PRINT_NO_VALUES;
 387
 388   gdb::unique_xmalloc_ptr<char> display_hint = varobj_get_display_hint (var);
 389   if (display_hint)
 390     uiout->field_string ("displayhint", display_hint.get ());
 391
 392   if (from < to)
 393     {
 394       /* For historical reasons this might emit a list or a tuple, so
 395          we construct one or the other.  */
 396       gdb::optional<ui_out_emit_tuple> tuple_emitter;
 397       gdb::optional<ui_out_emit_list> list_emitter;
 398
 399       if (mi_version (uiout) == 1)
 400         tuple_emitter.emplace (uiout, "children");
 401       else
 402         list_emitter.emplace (uiout, "children");
 403       for (int ix = from; ix < to && ix < children.size (); ix++)
 404         {
 405           ui_out_emit_tuple child_emitter (uiout, "child");
 406
 407           print_varobj (children[ix], print_values, 1 /* print expression */);
 408         }
 409     }
 410
 411   uiout->field_int ("has_more", varobj_has_more (var, to));
 412 }
 413
 414 void
 415 mi_cmd_var_info_type (const char *command, char **argv, int argc)
 416 {
 417   struct ui_out *uiout = current_uiout;
 418   struct varobj *var;
 419
 420   if (argc != 1)
 421     error (_("-var-info-type: Usage: NAME."));
 422
 423   /* Get varobj handle, if a valid var obj name was specified.  */
 424   var = varobj_get_handle (argv[0]);
 425
 426   std::string type_name = varobj_get_type (var);
 427   uiout->field_string ("type", type_name.c_str ());
 428 }
 429
 430 void
 431 mi_cmd_var_info_path_expression (const char *command, char **argv, int argc)
 432 {
 433   struct ui_out *uiout = current_uiout;
 434   struct varobj *var;
 435
 436   if (argc != 1)
 437     error (_("Usage: NAME."));
 438
 439   /* Get varobj handle, if a valid var obj name was specified.  */
 440   var = varobj_get_handle (argv[0]);
 441
 442   const char *path_expr = varobj_get_path_expr (var);
 443
 444   uiout->field_string ("path_expr", path_expr);
 445 }
 446
 447 void
 448 mi_cmd_var_info_expression (const char *command, char **argv, int argc)
 449 {
 450   struct ui_out *uiout = current_uiout;
 451   const struct language_defn *lang;
 452   struct varobj *var;
 453
 454   if (argc != 1)
 455     error (_("-var-info-expression: Usage: NAME."));
 456
 457   /* Get varobj handle, if a valid var obj name was specified.  */
 458   var = varobj_get_handle (argv[0]);
 459
 460   lang = varobj_get_language (var);
 461
 462   uiout->field_string ("lang", lang->la_natural_name);
 463
 464   std::string exp = varobj_get_expression (var);
 465   uiout->field_string ("exp", exp.c_str ());
 466 }
 467
 468 void
 469 mi_cmd_var_show_attributes (const char *command, char **argv, int argc)
 470 {
 471   struct ui_out *uiout = current_uiout;
 472   int attr;
 473   const char *attstr;
 474   struct varobj *var;
 475
 476   if (argc != 1)
 477     error (_("-var-show-attributes: Usage: NAME."));
 478
 479   /* Get varobj handle, if a valid var obj name was specified */
 480   var = varobj_get_handle (argv[0]);
 481
 482   attr = varobj_get_attributes (var);
 483   /* FIXME: define masks for attributes */
 484   if (attr & 0x00000001)
 485     attstr = "editable";
 486   else
 487     attstr = "noneditable";
 488
 489   uiout->field_string ("attr", attstr);
 490 }
 491
 492 void
 493 mi_cmd_var_evaluate_expression (const char *command, char **argv, int argc)
 494 {
 495   struct ui_out *uiout = current_uiout;
 496   struct varobj *var;
 497
 498   enum varobj_display_formats format;
 499   int formatFound;
 500   int oind;
 501   char *oarg;
 502
 503   enum opt
 504   {
 505     OP_FORMAT
 506   };
 507   static const struct mi_opt opts[] =
 508     {
 509       {"f", OP_FORMAT, 1},
 510       { 0, 0, 0 }
 511     };
 512
 513   /* Parse arguments.  */
 514   format = FORMAT_NATURAL;
 515   formatFound = 0;
 516   oind = 0;
 517   while (1)
 518     {
 519       int opt = mi_getopt ("-var-evaluate-expression", argc, argv,
 520                            opts, &oind, &oarg);
 521
 522       if (opt < 0)
 523         break;
 524       switch ((enum opt) opt)
 525         {
 526         case OP_FORMAT:
 527           if (formatFound)
 528             error (_("Cannot specify format more than once"));
 529
 530           format = mi_parse_format (oarg);
 531           formatFound = 1;
 532           break;
 533         }
 534     }
 535
 536   if (oind >= argc)
 537     error (_("Usage: [-f FORMAT] NAME"));
 538
 539   if (oind < argc - 1)
 540     error (_("Garbage at end of command"));
 541
 542   /* Get varobj handle, if a valid var obj name was specified.  */
 543   var = varobj_get_handle (argv[oind]);
 544
 545   if (formatFound)
 546     {
 547       std::string val = varobj_get_formatted_value (var, format);
 548
 549       uiout->field_string ("value", val.c_str ());
 550     }
 551   else
 552     {
 553       std::string val = varobj_get_value (var);
 554
 555       uiout->field_string ("value", val.c_str ());
 556     }
 557 }
 558
 559 void
 560 mi_cmd_var_assign (const char *command, char **argv, int argc)
 561 {
 562   struct ui_out *uiout = current_uiout;
 563   struct varobj *var;
 564
 565   if (argc != 2)
 566     error (_("-var-assign: Usage: NAME EXPRESSION."));
 567
 568   /* Get varobj handle, if a valid var obj name was specified.  */
 569   var = varobj_get_handle (argv[0]);
 570
 571   if (!varobj_editable_p (var))
 572     error (_("-var-assign: Variable object is not editable"));
 573
 574   const char *expression = argv[1];
 575
 576   /* MI command '-var-assign' may write memory, so suppress memory
 577      changed notification if it does.  */
 578   scoped_restore save_suppress
 579     = make_scoped_restore (&mi_suppress_notification.memory, 1);
 580
 581   if (!varobj_set_value (var, expression))
 582     error (_("-var-assign: Could not assign "
 583              "expression to variable object"));
 584
 585   std::string val = varobj_get_value (var);
 586   uiout->field_string ("value", val.c_str ());
 587 }
 588
 589 /* Type used for parameters passing to mi_cmd_var_update_iter.  */
 590
 591 struct mi_cmd_var_update
 592   {
 593     int only_floating;
 594     enum print_values print_values;
 595   };
 596
 597 /* Helper for mi_cmd_var_update - update each VAR.  */
 598
 599 static void
 600 mi_cmd_var_update_iter (struct varobj *var, void *data_pointer)
 601 {
 602   struct mi_cmd_var_update *data = (struct mi_cmd_var_update *) data_pointer;
 603   int thread_id, thread_stopped;
 604
 605   thread_id = varobj_get_thread_id (var);
 606
 607   if (thread_id == -1
 608       && (ptid_equal (inferior_ptid, null_ptid)
 609           || is_stopped (inferior_ptid)))
 610     thread_stopped = 1;
 611   else
 612     {
 613       struct thread_info *tp = find_thread_global_id (thread_id);
 614
 615       if (tp)
 616         thread_stopped = is_stopped (tp->ptid);
 617       else
 618         thread_stopped = 1;
 619     }
 620
 621   if (thread_stopped
 622       && (!data->only_floating || varobj_floating_p (var)))
 623     varobj_update_one (var, data->print_values, 0 /* implicit */);
 624 }
 625
 626 void
 627 mi_cmd_var_update (const char *command, char **argv, int argc)
 628 {
 629   struct ui_out *uiout = current_uiout;
 630   char *name;
 631   enum print_values print_values;
 632
 633   if (argc != 1 && argc != 2)
 634     error (_("-var-update: Usage: [PRINT_VALUES] NAME."));
 635
 636   if (argc == 1)
 637     name = argv[0];
 638   else
 639     name = argv[1];
 640
 641   if (argc == 2)
 642     print_values = mi_parse_print_values (argv[0]);
 643   else
 644     print_values = PRINT_NO_VALUES;
 645
 646   /* For historical reasons this might emit a list or a tuple, so we
 647      construct one or the other.  */
 648   gdb::optional<ui_out_emit_tuple> tuple_emitter;
 649   gdb::optional<ui_out_emit_list> list_emitter;
 650
 651   if (mi_version (uiout) <= 1)
 652     tuple_emitter.emplace (uiout, "changelist");
 653   else
 654     list_emitter.emplace (uiout, "changelist");
 655
 656   /* Check if the parameter is a "*", which means that we want to
 657      update all variables.  */
 658
 659   if ((*name == '*' || *name == '@') && (*(name + 1) == '\0'))
 660     {
 661       struct mi_cmd_var_update data;
 662
 663       data.only_floating = (*name == '@');
 664       data.print_values = print_values;
 665
 666       /* varobj_update_one automatically updates all the children of
 667          VAROBJ.  Therefore update each VAROBJ only once by iterating
 668          only the root VAROBJs.  */
 669
 670       all_root_varobjs (mi_cmd_var_update_iter, &data);
 671     }
 672   else
 673     {
 674       /* Get varobj handle, if a valid var obj name was specified.  */
 675       struct varobj *var = varobj_get_handle (name);
 676
 677       varobj_update_one (var, print_values, 1 /* explicit */);
 678     }
 679 }
 680
 681 /* Helper for mi_cmd_var_update().  */
 682
 683 static void
 684 varobj_update_one (struct varobj *var, enum print_values print_values,
 685                    int is_explicit)
 686 {
 687   struct ui_out *uiout = current_uiout;
 688   VEC (varobj_update_result) *changes;
 689   varobj_update_result *r;
 690   int i;
 691
 692   changes = varobj_update (&var, is_explicit);
 693
 694   for (i = 0; VEC_iterate (varobj_update_result, changes, i, r); ++i)
 695     {
 696       int from, to;
 697
 698       gdb::optional<ui_out_emit_tuple> tuple_emitter;
 699       if (mi_version (uiout) > 1)
 700         tuple_emitter.emplace (uiout, nullptr);
 701       uiout->field_string ("name", varobj_get_objname (r->varobj));
 702
 703       switch (r->status)
 704         {
 705         case VAROBJ_IN_SCOPE:
 706           if (mi_print_value_p (r->varobj, print_values))
 707             {
 708               std::string val = varobj_get_value (r->varobj);
 709
 710               uiout->field_string ("value", val.c_str ());
 711             }
 712           uiout->field_string ("in_scope", "true");
 713           break;
 714         case VAROBJ_NOT_IN_SCOPE:
 715           uiout->field_string ("in_scope", "false");
 716           break;
 717         case VAROBJ_INVALID:
 718           uiout->field_string ("in_scope", "invalid");
 719           break;
 720         }
 721
 722       if (r->status != VAROBJ_INVALID)
 723         {
 724           if (r->type_changed)
 725             uiout->field_string ("type_changed", "true");
 726           else
 727             uiout->field_string ("type_changed", "false");
 728         }
 729
 730       if (r->type_changed)
 731         {
 732           std::string type_name = varobj_get_type (r->varobj);
 733
 734           uiout->field_string ("new_type", type_name.c_str ());
 735         }
 736
 737       if (r->type_changed || r->children_changed)
 738         uiout->field_int ("new_num_children",
 739                           varobj_get_num_children (r->varobj));
 740
 741       gdb::unique_xmalloc_ptr<char> display_hint
 742         = varobj_get_display_hint (r->varobj);
 743       if (display_hint)
 744         uiout->field_string ("displayhint", display_hint.get ());
 745
 746       if (varobj_is_dynamic_p (r->varobj))
 747         uiout->field_int ("dynamic", 1);
 748
 749       varobj_get_child_range (r->varobj, &from, &to);
 750       uiout->field_int ("has_more", varobj_has_more (r->varobj, to));
 751
 752       if (r->newobj)
 753         {
 754           int j;
 755           varobj_p child;
 756
 757           ui_out_emit_list list_emitter (uiout, "new_children");
 758           for (j = 0; VEC_iterate (varobj_p, r->newobj, j, child); ++j)
 759             {
 760               ui_out_emit_tuple tuple_emitter (uiout, NULL);
 761               print_varobj (child, print_values, 1 /* print_expression */);
 762             }
 763
 764           VEC_free (varobj_p, r->newobj);
 765           r->newobj = NULL;     /* Paranoia.  */
 766         }
 767     }
 768   VEC_free (varobj_update_result, changes);
 769 }
 770
 771 void
 772 mi_cmd_enable_pretty_printing (const char *command, char **argv, int argc)
 773 {
 774   if (argc != 0)
 775     error (_("-enable-pretty-printing: no arguments allowed"));
 776
 777   varobj_enable_pretty_printing ();
 778 }
 779
 780 void
 781 mi_cmd_var_set_update_range (const char *command, char **argv, int argc)
 782 {
 783   struct varobj *var;
 784   int from, to;
 785
 786   if (argc != 3)
 787     error (_("-var-set-update-range: Usage: VAROBJ FROM TO"));
 788
 789   var = varobj_get_handle (argv[0]);
 790   from = atoi (argv[1]);
 791   to = atoi (argv[2]);
 792
 793   varobj_set_child_range (var, from, to);
 794 }