gdb/mi/mi-cmd-var.c

   1 /* MI Command Set - varobj commands.
   2
   3    Copyright (C) 2000, 2002, 2004, 2005 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., 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, 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 const char mi_no_values[] = "--no-values";
  34 const char mi_simple_values[] = "--simple-values";
  35 const char mi_all_values[] = "--all-values";
  36
  37 extern int varobjdebug;         /* defined in varobj.c */
  38
  39 static int varobj_update_one (struct varobj *var,
  40                               enum print_values print_values);
  41
  42 /* VAROBJ operations */
  43
  44 enum mi_cmd_result
  45 mi_cmd_var_create (char *command, char **argv, int argc)
  46 {
  47   CORE_ADDR frameaddr = 0;
  48   struct varobj *var;
  49   char *name;
  50   char *frame;
  51   char *expr;
  52   char *type;
  53   struct cleanup *old_cleanups;
  54   enum varobj_type var_type;
  55
  56   if (argc != 3)
  57     {
  58       /* mi_error_message = xstrprintf ("mi_cmd_var_create: Usage:
  59          ...."); return MI_CMD_ERROR; */
  60       error (_("mi_cmd_var_create: Usage: NAME FRAME EXPRESSION."));
  61     }
  62
  63   name = xstrdup (argv[0]);
  64   /* Add cleanup for name. Must be free_current_contents as
  65      name can be reallocated */
  66   old_cleanups = make_cleanup (free_current_contents, &name);
  67
  68   frame = xstrdup (argv[1]);
  69   make_cleanup (xfree, frame);
  70
  71   expr = xstrdup (argv[2]);
  72   make_cleanup (xfree, expr);
  73
  74   if (strcmp (name, "-") == 0)
  75     {
  76       xfree (name);
  77       name = varobj_gen_name ();
  78     }
  79   else if (!isalpha (*name))
  80     error (_("mi_cmd_var_create: name of object must begin with a letter"));
  81
  82   if (strcmp (frame, "*") == 0)
  83     var_type = USE_CURRENT_FRAME;
  84   else if (strcmp (frame, "@") == 0)
  85     var_type = USE_SELECTED_FRAME;
  86   else
  87     {
  88       var_type = USE_SPECIFIED_FRAME;
  89       frameaddr = string_to_core_addr (frame);
  90     }
  91
  92   if (varobjdebug)
  93     fprintf_unfiltered (gdb_stdlog,
  94                     "Name=\"%s\", Frame=\"%s\" (0x%s), Expression=\"%s\"\n",
  95                         name, frame, paddr (frameaddr), expr);
  96
  97   var = varobj_create (name, expr, frameaddr, var_type);
  98
  99   if (var == NULL)
 100     error (_("mi_cmd_var_create: unable to create variable object"));
 101
 102   ui_out_field_string (uiout, "name", name);
 103   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 104   type = varobj_get_type (var);
 105   if (type == NULL)
 106     ui_out_field_string (uiout, "type", "");
 107   else
 108     {
 109       ui_out_field_string (uiout, "type", type);
 110       xfree (type);
 111     }
 112
 113   do_cleanups (old_cleanups);
 114   return MI_CMD_DONE;
 115 }
 116
 117 enum mi_cmd_result
 118 mi_cmd_var_delete (char *command, char **argv, int argc)
 119 {
 120   char *name;
 121   char *expr;
 122   struct varobj *var;
 123   int numdel;
 124   int children_only_p = 0;
 125   struct cleanup *old_cleanups;
 126
 127   if (argc < 1 || argc > 2)
 128     error (_("mi_cmd_var_delete: Usage: [-c] EXPRESSION."));
 129
 130   name = xstrdup (argv[0]);
 131   /* Add cleanup for name. Must be free_current_contents as
 132      name can be reallocated */
 133   old_cleanups = make_cleanup (free_current_contents, &name);
 134
 135   /* If we have one single argument it cannot be '-c' or any string
 136      starting with '-'. */
 137   if (argc == 1)
 138     {
 139       if (strcmp (name, "-c") == 0)
 140         error (_("mi_cmd_var_delete: Missing required argument after '-c': variable object name"));
 141       if (*name == '-')
 142         error (_("mi_cmd_var_delete: Illegal variable object name"));
 143     }
 144
 145   /* If we have 2 arguments they must be '-c' followed by a string
 146      which would be the variable name. */
 147   if (argc == 2)
 148     {
 149       expr = xstrdup (argv[1]);
 150       if (strcmp (name, "-c") != 0)
 151         error (_("mi_cmd_var_delete: Invalid option."));
 152       children_only_p = 1;
 153       xfree (name);
 154       name = xstrdup (expr);
 155       xfree (expr);
 156     }
 157
 158   /* If we didn't error out, now NAME contains the name of the
 159      variable. */
 160
 161   var = varobj_get_handle (name);
 162
 163   if (var == NULL)
 164     error (_("mi_cmd_var_delete: Variable object not found."));
 165
 166   numdel = varobj_delete (var, NULL, children_only_p);
 167
 168   ui_out_field_int (uiout, "ndeleted", numdel);
 169
 170   do_cleanups (old_cleanups);
 171   return MI_CMD_DONE;
 172 }
 173
 174 enum mi_cmd_result
 175 mi_cmd_var_set_format (char *command, char **argv, int argc)
 176 {
 177   enum varobj_display_formats format;
 178   int len;
 179   struct varobj *var;
 180   char *formspec;
 181
 182   if (argc != 2)
 183     error (_("mi_cmd_var_set_format: Usage: NAME FORMAT."));
 184
 185   /* Get varobj handle, if a valid var obj name was specified */
 186   var = varobj_get_handle (argv[0]);
 187
 188   if (var == NULL)
 189     error (_("mi_cmd_var_set_format: Variable object not found"));
 190
 191   formspec = xstrdup (argv[1]);
 192   if (formspec == NULL)
 193     error (_("mi_cmd_var_set_format: Must specify the format as: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 194
 195   len = strlen (formspec);
 196
 197   if (strncmp (formspec, "natural", len) == 0)
 198     format = FORMAT_NATURAL;
 199   else if (strncmp (formspec, "binary", len) == 0)
 200     format = FORMAT_BINARY;
 201   else if (strncmp (formspec, "decimal", len) == 0)
 202     format = FORMAT_DECIMAL;
 203   else if (strncmp (formspec, "hexadecimal", len) == 0)
 204     format = FORMAT_HEXADECIMAL;
 205   else if (strncmp (formspec, "octal", len) == 0)
 206     format = FORMAT_OCTAL;
 207   else
 208     error (_("mi_cmd_var_set_format: Unknown display format: must be: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 209
 210   /* Set the format of VAR to given format */
 211   varobj_set_display_format (var, format);
 212
 213   /* Report the new current format */
 214   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 215   return MI_CMD_DONE;
 216 }
 217
 218 enum mi_cmd_result
 219 mi_cmd_var_show_format (char *command, char **argv, int argc)
 220 {
 221   enum varobj_display_formats format;
 222   struct varobj *var;
 223
 224   if (argc != 1)
 225     error (_("mi_cmd_var_show_format: Usage: NAME."));
 226
 227   /* Get varobj handle, if a valid var obj name was specified */
 228   var = varobj_get_handle (argv[0]);
 229   if (var == NULL)
 230     error (_("mi_cmd_var_show_format: Variable object not found"));
 231
 232   format = varobj_get_display_format (var);
 233
 234   /* Report the current format */
 235   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 236   return MI_CMD_DONE;
 237 }
 238
 239 enum mi_cmd_result
 240 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 241 {
 242   struct varobj *var;
 243
 244   if (argc != 1)
 245     error (_("mi_cmd_var_info_num_children: Usage: NAME."));
 246
 247   /* Get varobj handle, if a valid var obj name was specified */
 248   var = varobj_get_handle (argv[0]);
 249   if (var == NULL)
 250     error (_("mi_cmd_var_info_num_children: Variable object not found"));
 251
 252   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 253   return MI_CMD_DONE;
 254 }
 255
 256 /* Parse a string argument into a print_values value.  */
 257
 258 static enum print_values
 259 mi_parse_values_option (const char *arg)
 260 {
 261   if (strcmp (arg, "0") == 0
 262       || strcmp (arg, mi_no_values) == 0)
 263     return PRINT_NO_VALUES;
 264   else if (strcmp (arg, "1") == 0
 265            || strcmp (arg, mi_all_values) == 0)
 266     return PRINT_ALL_VALUES;
 267   else if (strcmp (arg, "2") == 0
 268            || strcmp (arg, mi_simple_values) == 0)
 269     return PRINT_SIMPLE_VALUES;
 270   else
 271     error (_("Unknown value for PRINT_VALUES\n\
 272 Must be: 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
 273            mi_no_values, mi_simple_values, mi_all_values);
 274 }
 275
 276 /* Return 1 if given the argument PRINT_VALUES we should display
 277    a value of type TYPE.  */
 278
 279 static int
 280 mi_print_value_p (struct type *type, enum print_values print_values)
 281 {
 282   if (type != NULL)
 283     type = check_typedef (type);
 284
 285   if (print_values == PRINT_NO_VALUES)
 286     return 0;
 287
 288   if (print_values == PRINT_ALL_VALUES)
 289     return 1;
 290
 291   /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 292      and that type is not a compound type.  */
 293
 294   return (TYPE_CODE (type) != TYPE_CODE_ARRAY
 295           && TYPE_CODE (type) != TYPE_CODE_STRUCT
 296           && TYPE_CODE (type) != TYPE_CODE_UNION);
 297 }
 298
 299 enum mi_cmd_result
 300 mi_cmd_var_list_children (char *command, char **argv, int argc)
 301 {
 302   struct varobj *var;
 303   struct varobj **childlist;
 304   struct varobj **cc;
 305   struct cleanup *cleanup_children;
 306   int numchild;
 307   char *type;
 308   enum print_values print_values;
 309
 310   if (argc != 1 && argc != 2)
 311     error (_("mi_cmd_var_list_children: Usage: [PRINT_VALUES] NAME"));
 312
 313   /* Get varobj handle, if a valid var obj name was specified */
 314   if (argc == 1)
 315     var = varobj_get_handle (argv[0]);
 316   else
 317     var = varobj_get_handle (argv[1]);
 318   if (var == NULL)
 319     error (_("Variable object not found"));
 320
 321   numchild = varobj_list_children (var, &childlist);
 322   ui_out_field_int (uiout, "numchild", numchild);
 323   if (argc == 2)
 324     print_values = mi_parse_values_option (argv[0]);
 325   else
 326     print_values = PRINT_NO_VALUES;
 327
 328   if (numchild <= 0)
 329     return MI_CMD_DONE;
 330
 331   if (mi_version (uiout) == 1)
 332     cleanup_children = make_cleanup_ui_out_tuple_begin_end (uiout, "children");
 333   else
 334     cleanup_children = make_cleanup_ui_out_list_begin_end (uiout, "children");
 335   cc = childlist;
 336   while (*cc != NULL)
 337     {
 338       struct cleanup *cleanup_child;
 339       cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
 340       ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 341       ui_out_field_string (uiout, "exp", varobj_get_expression (*cc));
 342       ui_out_field_int (uiout, "numchild", varobj_get_num_children (*cc));
 343       if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
 344         ui_out_field_string (uiout, "value", varobj_get_value (*cc));
 345       type = varobj_get_type (*cc);
 346       /* C++ pseudo-variables (public, private, protected) do not have a type */
 347       if (type)
 348         ui_out_field_string (uiout, "type", type);
 349       do_cleanups (cleanup_child);
 350       cc++;
 351     }
 352   do_cleanups (cleanup_children);
 353   xfree (childlist);
 354   return MI_CMD_DONE;
 355 }
 356
 357 enum mi_cmd_result
 358 mi_cmd_var_info_type (char *command, char **argv, int argc)
 359 {
 360   struct varobj *var;
 361
 362   if (argc != 1)
 363     error (_("mi_cmd_var_info_type: Usage: NAME."));
 364
 365   /* Get varobj handle, if a valid var obj name was specified */
 366   var = varobj_get_handle (argv[0]);
 367   if (var == NULL)
 368     error (_("mi_cmd_var_info_type: Variable object not found"));
 369
 370   ui_out_field_string (uiout, "type", varobj_get_type (var));
 371   return MI_CMD_DONE;
 372 }
 373
 374 enum mi_cmd_result
 375 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 376 {
 377   enum varobj_languages lang;
 378   struct varobj *var;
 379
 380   if (argc != 1)
 381     error (_("mi_cmd_var_info_expression: Usage: NAME."));
 382
 383   /* Get varobj handle, if a valid var obj name was specified */
 384   var = varobj_get_handle (argv[0]);
 385   if (var == NULL)
 386     error (_("mi_cmd_var_info_expression: Variable object not found"));
 387
 388   lang = varobj_get_language (var);
 389
 390   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 391   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 392   return MI_CMD_DONE;
 393 }
 394
 395 enum mi_cmd_result
 396 mi_cmd_var_show_attributes (char *command, char **argv, int argc)
 397 {
 398   int attr;
 399   char *attstr;
 400   struct varobj *var;
 401
 402   if (argc != 1)
 403     error (_("mi_cmd_var_show_attributes: Usage: NAME."));
 404
 405   /* Get varobj handle, if a valid var obj name was specified */
 406   var = varobj_get_handle (argv[0]);
 407   if (var == NULL)
 408     error (_("mi_cmd_var_show_attributes: Variable object not found"));
 409
 410   attr = varobj_get_attributes (var);
 411   /* FIXME: define masks for attributes */
 412   if (attr & 0x00000001)
 413     attstr = "editable";
 414   else
 415     attstr = "noneditable";
 416
 417   ui_out_field_string (uiout, "attr", attstr);
 418   return MI_CMD_DONE;
 419 }
 420
 421 enum mi_cmd_result
 422 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 423 {
 424   struct varobj *var;
 425
 426   if (argc != 1)
 427     error (_("mi_cmd_var_evaluate_expression: Usage: NAME."));
 428
 429   /* Get varobj handle, if a valid var obj name was specified */
 430   var = varobj_get_handle (argv[0]);
 431   if (var == NULL)
 432     error (_("mi_cmd_var_evaluate_expression: Variable object not found"));
 433
 434   ui_out_field_string (uiout, "value", varobj_get_value (var));
 435   return MI_CMD_DONE;
 436 }
 437
 438 enum mi_cmd_result
 439 mi_cmd_var_assign (char *command, char **argv, int argc)
 440 {
 441   struct varobj *var;
 442   char *expression;
 443
 444   if (argc != 2)
 445     error (_("mi_cmd_var_assign: Usage: NAME EXPRESSION."));
 446
 447   /* Get varobj handle, if a valid var obj name was specified */
 448   var = varobj_get_handle (argv[0]);
 449   if (var == NULL)
 450     error (_("mi_cmd_var_assign: Variable object not found"));
 451
 452   /* FIXME: define masks for attributes */
 453   if (!(varobj_get_attributes (var) & 0x00000001))
 454     error (_("mi_cmd_var_assign: Variable object is not editable"));
 455
 456   expression = xstrdup (argv[1]);
 457
 458   if (!varobj_set_value (var, expression))
 459     error (_("mi_cmd_var_assign: Could not assign expression to varible object"));
 460
 461   ui_out_field_string (uiout, "value", varobj_get_value (var));
 462   return MI_CMD_DONE;
 463 }
 464
 465 enum mi_cmd_result
 466 mi_cmd_var_update (char *command, char **argv, int argc)
 467 {
 468   struct varobj *var;
 469   struct varobj **rootlist;
 470   struct varobj **cr;
 471   struct cleanup *cleanup;
 472   char *name;
 473   int nv;
 474   enum print_values print_values;
 475
 476   if (argc != 1 && argc != 2)
 477     error (_("mi_cmd_var_update: Usage: [PRINT_VALUES] NAME."));
 478
 479   if (argc == 1)
 480     name = argv[0];
 481   else
 482     name = (argv[1]);
 483
 484   if (argc == 2)
 485     print_values = mi_parse_values_option (argv[0]);
 486   else
 487     print_values = PRINT_NO_VALUES;
 488
 489   /* Check if the parameter is a "*" which means that we want
 490      to update all variables */
 491
 492   if ((*name == '*') && (*(name + 1) == '\0'))
 493     {
 494       nv = varobj_list (&rootlist);
 495       if (mi_version (uiout) <= 1)
 496         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 497       else
 498         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 499       if (nv <= 0)
 500         {
 501           do_cleanups (cleanup);
 502           return MI_CMD_DONE;
 503         }
 504       cr = rootlist;
 505       while (*cr != NULL)
 506         {
 507           varobj_update_one (*cr, print_values);
 508           cr++;
 509         }
 510       xfree (rootlist);
 511       do_cleanups (cleanup);
 512     }
 513   else
 514     {
 515       /* Get varobj handle, if a valid var obj name was specified */
 516       var = varobj_get_handle (name);
 517       if (var == NULL)
 518         error (_("mi_cmd_var_update: Variable object not found"));
 519
 520       if (mi_version (uiout) <= 1)
 521         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 522       else
 523         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 524       varobj_update_one (var, print_values);
 525       do_cleanups (cleanup);
 526     }
 527     return MI_CMD_DONE;
 528 }
 529
 530 /* Helper for mi_cmd_var_update() Returns 0 if the update for
 531    the variable fails (usually because the variable is out of
 532    scope), and 1 if it succeeds. */
 533
 534 static int
 535 varobj_update_one (struct varobj *var, enum print_values print_values)
 536 {
 537   struct varobj **changelist;
 538   struct varobj **cc;
 539   struct cleanup *cleanup = NULL;
 540   int nc;
 541
 542   nc = varobj_update (&var, &changelist);
 543
 544   /* nc == 0 means that nothing has changed.
 545      nc == -1 means that an error occured in updating the variable.
 546      nc == -2 means the variable has changed type. */
 547
 548   if (nc == 0)
 549     return 1;
 550   else if (nc == -1)
 551     {
 552       if (mi_version (uiout) > 1)
 553         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 554       ui_out_field_string (uiout, "name", varobj_get_objname(var));
 555       ui_out_field_string (uiout, "in_scope", "false");
 556       if (mi_version (uiout) > 1)
 557         do_cleanups (cleanup);
 558       return -1;
 559     }
 560   else if (nc == -2)
 561     {
 562       if (mi_version (uiout) > 1)
 563         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 564       ui_out_field_string (uiout, "name", varobj_get_objname (var));
 565       ui_out_field_string (uiout, "in_scope", "true");
 566       ui_out_field_string (uiout, "new_type", varobj_get_type(var));
 567       ui_out_field_int (uiout, "new_num_children",
 568                            varobj_get_num_children(var));
 569       if (mi_version (uiout) > 1)
 570         do_cleanups (cleanup);
 571     }
 572   else
 573     {
 574
 575       cc = changelist;
 576       while (*cc != NULL)
 577         {
 578           if (mi_version (uiout) > 1)
 579             cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 580           ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 581           if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
 582             ui_out_field_string (uiout, "value", varobj_get_value (*cc));
 583           ui_out_field_string (uiout, "in_scope", "true");
 584           ui_out_field_string (uiout, "type_changed", "false");
 585           if (mi_version (uiout) > 1)
 586             do_cleanups (cleanup);
 587           cc++;
 588         }
 589       xfree (changelist);
 590       return 1;
 591     }
 592   return 1;
 593 }