gdb/mi/mi-cmd-var.c

   1 /* MI Command Set - varobj commands.
   2
   3    Copyright (C) 2000, 2002, 2004, 2005, 2007, 2008
   4    Free Software Foundation, Inc.
   5
   6    Contributed by Cygnus Solutions (a Red Hat company).
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "mi-cmds.h"
  25 #include "ui-out.h"
  26 #include "mi-out.h"
  27 #include "varobj.h"
  28 #include "value.h"
  29 #include <ctype.h>
  30 #include "gdb_string.h"
  31
  32 const char mi_no_values[] = "--no-values";
  33 const char mi_simple_values[] = "--simple-values";
  34 const char mi_all_values[] = "--all-values";
  35
  36 extern int varobjdebug;         /* defined in varobj.c.  */
  37
  38 static void varobj_update_one (struct varobj *var,
  39                               enum print_values print_values,
  40                               int explicit);
  41
  42 static int mi_print_value_p (struct type *type, 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 static void
  48 print_varobj (struct varobj *var, enum print_values print_values,
  49               int print_expression)
  50 {
  51   struct type *gdb_type;
  52   char *type;
  53
  54   ui_out_field_string (uiout, "name", varobj_get_objname (var));
  55   if (print_expression)
  56     ui_out_field_string (uiout, "exp", varobj_get_expression (var));
  57   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
  58
  59   if (mi_print_value_p (varobj_get_gdb_type (var), print_values))
  60     ui_out_field_string (uiout, "value", varobj_get_value (var));
  61
  62   type = varobj_get_type (var);
  63   if (type != NULL)
  64     {
  65       ui_out_field_string (uiout, "type", type);
  66       xfree (type);
  67     }
  68
  69   if (varobj_get_frozen (var))
  70     ui_out_field_int (uiout, "frozen", 1);
  71 }
  72
  73 /* VAROBJ operations */
  74
  75 enum mi_cmd_result
  76 mi_cmd_var_create (char *command, char **argv, int argc)
  77 {
  78   CORE_ADDR frameaddr = 0;
  79   struct varobj *var;
  80   char *name;
  81   char *frame;
  82   char *expr;
  83   struct cleanup *old_cleanups;
  84   enum varobj_type var_type;
  85
  86   if (argc != 3)
  87     {
  88       /* mi_error_message = xstrprintf ("mi_cmd_var_create: Usage:
  89          ...."); return MI_CMD_ERROR; */
  90       error (_("mi_cmd_var_create: Usage: NAME FRAME EXPRESSION."));
  91     }
  92
  93   name = xstrdup (argv[0]);
  94   /* Add cleanup for name. Must be free_current_contents as
  95      name can be reallocated */
  96   old_cleanups = make_cleanup (free_current_contents, &name);
  97
  98   frame = xstrdup (argv[1]);
  99   make_cleanup (xfree, frame);
 100
 101   expr = xstrdup (argv[2]);
 102   make_cleanup (xfree, expr);
 103
 104   if (strcmp (name, "-") == 0)
 105     {
 106       xfree (name);
 107       name = varobj_gen_name ();
 108     }
 109   else if (!isalpha (*name))
 110     error (_("mi_cmd_var_create: name of object must begin with a letter"));
 111
 112   if (strcmp (frame, "*") == 0)
 113     var_type = USE_CURRENT_FRAME;
 114   else if (strcmp (frame, "@") == 0)
 115     var_type = USE_SELECTED_FRAME;
 116   else
 117     {
 118       var_type = USE_SPECIFIED_FRAME;
 119       frameaddr = string_to_core_addr (frame);
 120     }
 121
 122   if (varobjdebug)
 123     fprintf_unfiltered (gdb_stdlog,
 124                     "Name=\"%s\", Frame=\"%s\" (0x%s), Expression=\"%s\"\n",
 125                         name, frame, paddr (frameaddr), expr);
 126
 127   var = varobj_create (name, expr, frameaddr, var_type);
 128
 129   if (var == NULL)
 130     error (_("mi_cmd_var_create: unable to create variable object"));
 131
 132   print_varobj (var, PRINT_ALL_VALUES, 0 /* don't print expression */);
 133
 134   do_cleanups (old_cleanups);
 135   return MI_CMD_DONE;
 136 }
 137
 138 enum mi_cmd_result
 139 mi_cmd_var_delete (char *command, char **argv, int argc)
 140 {
 141   char *name;
 142   struct varobj *var;
 143   int numdel;
 144   int children_only_p = 0;
 145   struct cleanup *old_cleanups;
 146
 147   if (argc < 1 || argc > 2)
 148     error (_("mi_cmd_var_delete: Usage: [-c] EXPRESSION."));
 149
 150   name = xstrdup (argv[0]);
 151   /* Add cleanup for name. Must be free_current_contents as
 152      name can be reallocated */
 153   old_cleanups = make_cleanup (free_current_contents, &name);
 154
 155   /* If we have one single argument it cannot be '-c' or any string
 156      starting with '-'. */
 157   if (argc == 1)
 158     {
 159       if (strcmp (name, "-c") == 0)
 160         error (_("mi_cmd_var_delete: Missing required argument after '-c': variable object name"));
 161       if (*name == '-')
 162         error (_("mi_cmd_var_delete: Illegal variable object name"));
 163     }
 164
 165   /* If we have 2 arguments they must be '-c' followed by a string
 166      which would be the variable name. */
 167   if (argc == 2)
 168     {
 169       if (strcmp (name, "-c") != 0)
 170         error (_("mi_cmd_var_delete: Invalid option."));
 171       children_only_p = 1;
 172       do_cleanups (old_cleanups);
 173       name = xstrdup (argv[1]);
 174       make_cleanup (free_current_contents, &name);
 175     }
 176
 177   /* If we didn't error out, now NAME contains the name of the
 178      variable. */
 179
 180   var = varobj_get_handle (name);
 181
 182   if (var == NULL)
 183     error (_("mi_cmd_var_delete: Variable object not found."));
 184
 185   numdel = varobj_delete (var, NULL, children_only_p);
 186
 187   ui_out_field_int (uiout, "ndeleted", numdel);
 188
 189   do_cleanups (old_cleanups);
 190   return MI_CMD_DONE;
 191 }
 192
 193 enum mi_cmd_result
 194 mi_cmd_var_set_format (char *command, char **argv, int argc)
 195 {
 196   enum varobj_display_formats format;
 197   int len;
 198   struct varobj *var;
 199   char *formspec;
 200
 201   if (argc != 2)
 202     error (_("mi_cmd_var_set_format: Usage: NAME FORMAT."));
 203
 204   /* Get varobj handle, if a valid var obj name was specified */
 205   var = varobj_get_handle (argv[0]);
 206
 207   if (var == NULL)
 208     error (_("mi_cmd_var_set_format: Variable object not found"));
 209
 210   formspec = argv[1];
 211   if (formspec == NULL)
 212     error (_("mi_cmd_var_set_format: Must specify the format as: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 213
 214   len = strlen (formspec);
 215
 216   if (strncmp (formspec, "natural", len) == 0)
 217     format = FORMAT_NATURAL;
 218   else if (strncmp (formspec, "binary", len) == 0)
 219     format = FORMAT_BINARY;
 220   else if (strncmp (formspec, "decimal", len) == 0)
 221     format = FORMAT_DECIMAL;
 222   else if (strncmp (formspec, "hexadecimal", len) == 0)
 223     format = FORMAT_HEXADECIMAL;
 224   else if (strncmp (formspec, "octal", len) == 0)
 225     format = FORMAT_OCTAL;
 226   else
 227     error (_("mi_cmd_var_set_format: Unknown display format: must be: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 228
 229   /* Set the format of VAR to given format */
 230   varobj_set_display_format (var, format);
 231
 232   /* Report the new current format */
 233   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 234
 235   /* Report the value in the new format */
 236   ui_out_field_string (uiout, "value", varobj_get_value (var));
 237   return MI_CMD_DONE;
 238 }
 239
 240 enum mi_cmd_result
 241 mi_cmd_var_set_frozen (char *command, char **argv, int argc)
 242 {
 243   struct varobj *var;
 244   int frozen;
 245
 246   if (argc != 2)
 247     error (_("-var-set-format: Usage: NAME FROZEN_FLAG."));
 248
 249   var = varobj_get_handle (argv[0]);
 250   if (var == NULL)
 251     error (_("Variable object not found"));
 252
 253   if (strcmp (argv[1], "0") == 0)
 254     frozen = 0;
 255   else if (strcmp (argv[1], "1") == 0)
 256     frozen = 1;
 257   else
 258     error (_("Invalid flag value"));
 259
 260   varobj_set_frozen (var, frozen);
 261
 262   /* We don't automatically return the new value, or what varobjs got new
 263      values during unfreezing.  If this information is required, client
 264      should call -var-update explicitly.  */
 265   return MI_CMD_DONE;
 266 }
 267
 268
 269 enum mi_cmd_result
 270 mi_cmd_var_show_format (char *command, char **argv, int argc)
 271 {
 272   enum varobj_display_formats format;
 273   struct varobj *var;
 274
 275   if (argc != 1)
 276     error (_("mi_cmd_var_show_format: Usage: NAME."));
 277
 278   /* Get varobj handle, if a valid var obj name was specified */
 279   var = varobj_get_handle (argv[0]);
 280   if (var == NULL)
 281     error (_("mi_cmd_var_show_format: Variable object not found"));
 282
 283   format = varobj_get_display_format (var);
 284
 285   /* Report the current format */
 286   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 287   return MI_CMD_DONE;
 288 }
 289
 290 enum mi_cmd_result
 291 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 292 {
 293   struct varobj *var;
 294
 295   if (argc != 1)
 296     error (_("mi_cmd_var_info_num_children: Usage: NAME."));
 297
 298   /* Get varobj handle, if a valid var obj name was specified */
 299   var = varobj_get_handle (argv[0]);
 300   if (var == NULL)
 301     error (_("mi_cmd_var_info_num_children: Variable object not found"));
 302
 303   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 304   return MI_CMD_DONE;
 305 }
 306
 307 /* Parse a string argument into a print_values value.  */
 308
 309 static enum print_values
 310 mi_parse_values_option (const char *arg)
 311 {
 312   if (strcmp (arg, "0") == 0
 313       || strcmp (arg, mi_no_values) == 0)
 314     return PRINT_NO_VALUES;
 315   else if (strcmp (arg, "1") == 0
 316            || strcmp (arg, mi_all_values) == 0)
 317     return PRINT_ALL_VALUES;
 318   else if (strcmp (arg, "2") == 0
 319            || strcmp (arg, mi_simple_values) == 0)
 320     return PRINT_SIMPLE_VALUES;
 321   else
 322     error (_("Unknown value for PRINT_VALUES\n\
 323 Must be: 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
 324            mi_no_values, mi_simple_values, mi_all_values);
 325 }
 326
 327 /* Return 1 if given the argument PRINT_VALUES we should display
 328    a value of type TYPE.  */
 329
 330 static int
 331 mi_print_value_p (struct type *type, enum print_values print_values)
 332 {
 333
 334   if (print_values == PRINT_NO_VALUES)
 335     return 0;
 336
 337   if (print_values == PRINT_ALL_VALUES)
 338     return 1;
 339
 340   if (type == NULL)
 341     return 1;
 342   else
 343     {
 344       type = check_typedef (type);
 345
 346       /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 347          and that type is not a compound type.  */
 348       return (TYPE_CODE (type) != TYPE_CODE_ARRAY
 349               && TYPE_CODE (type) != TYPE_CODE_STRUCT
 350               && TYPE_CODE (type) != TYPE_CODE_UNION);
 351     }
 352 }
 353
 354 enum mi_cmd_result
 355 mi_cmd_var_list_children (char *command, char **argv, int argc)
 356 {
 357   struct varobj *var;
 358   VEC(varobj_p) *children;
 359   struct varobj *child;
 360   struct cleanup *cleanup_children;
 361   int numchild;
 362   enum print_values print_values;
 363   int ix;
 364
 365   if (argc != 1 && argc != 2)
 366     error (_("mi_cmd_var_list_children: Usage: [PRINT_VALUES] NAME"));
 367
 368   /* Get varobj handle, if a valid var obj name was specified */
 369   if (argc == 1)
 370     var = varobj_get_handle (argv[0]);
 371   else
 372     var = varobj_get_handle (argv[1]);
 373   if (var == NULL)
 374     error (_("Variable object not found"));
 375
 376   children = varobj_list_children (var);
 377   ui_out_field_int (uiout, "numchild", VEC_length (varobj_p, children));
 378   if (argc == 2)
 379     print_values = mi_parse_values_option (argv[0]);
 380   else
 381     print_values = PRINT_NO_VALUES;
 382
 383   if (VEC_length (varobj_p, children) == 0)
 384     return MI_CMD_DONE;
 385
 386   if (mi_version (uiout) == 1)
 387     cleanup_children = make_cleanup_ui_out_tuple_begin_end (uiout, "children");
 388   else
 389     cleanup_children = make_cleanup_ui_out_list_begin_end (uiout, "children");
 390   for (ix = 0; VEC_iterate (varobj_p, children, ix, child); ++ix)
 391     {
 392       struct cleanup *cleanup_child;
 393       cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
 394       print_varobj (child, print_values, 1 /* print expression */);
 395       do_cleanups (cleanup_child);
 396     }
 397   do_cleanups (cleanup_children);
 398   return MI_CMD_DONE;
 399 }
 400
 401 enum mi_cmd_result
 402 mi_cmd_var_info_type (char *command, char **argv, int argc)
 403 {
 404   struct varobj *var;
 405
 406   if (argc != 1)
 407     error (_("mi_cmd_var_info_type: Usage: NAME."));
 408
 409   /* Get varobj handle, if a valid var obj name was specified */
 410   var = varobj_get_handle (argv[0]);
 411   if (var == NULL)
 412     error (_("mi_cmd_var_info_type: Variable object not found"));
 413
 414   ui_out_field_string (uiout, "type", varobj_get_type (var));
 415   return MI_CMD_DONE;
 416 }
 417
 418 enum mi_cmd_result
 419 mi_cmd_var_info_path_expression (char *command, char **argv, int argc)
 420 {
 421   struct varobj *var;
 422   char *path_expr;
 423
 424   if (argc != 1)
 425     error (_("Usage: NAME."));
 426
 427   /* Get varobj handle, if a valid var obj name was specified.  */
 428   var = varobj_get_handle (argv[0]);
 429   if (var == NULL)
 430     error (_("Variable object not found"));
 431
 432   path_expr = varobj_get_path_expr (var);
 433
 434   ui_out_field_string (uiout, "path_expr", path_expr);
 435
 436   return MI_CMD_DONE;
 437 }
 438
 439 enum mi_cmd_result
 440 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 441 {
 442   enum varobj_languages lang;
 443   struct varobj *var;
 444
 445   if (argc != 1)
 446     error (_("mi_cmd_var_info_expression: Usage: NAME."));
 447
 448   /* Get varobj handle, if a valid var obj name was specified */
 449   var = varobj_get_handle (argv[0]);
 450   if (var == NULL)
 451     error (_("mi_cmd_var_info_expression: Variable object not found"));
 452
 453   lang = varobj_get_language (var);
 454
 455   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 456   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 457   return MI_CMD_DONE;
 458 }
 459
 460 enum mi_cmd_result
 461 mi_cmd_var_show_attributes (char *command, char **argv, int argc)
 462 {
 463   int attr;
 464   char *attstr;
 465   struct varobj *var;
 466
 467   if (argc != 1)
 468     error (_("mi_cmd_var_show_attributes: Usage: NAME."));
 469
 470   /* Get varobj handle, if a valid var obj name was specified */
 471   var = varobj_get_handle (argv[0]);
 472   if (var == NULL)
 473     error (_("mi_cmd_var_show_attributes: Variable object not found"));
 474
 475   attr = varobj_get_attributes (var);
 476   /* FIXME: define masks for attributes */
 477   if (attr & 0x00000001)
 478     attstr = "editable";
 479   else
 480     attstr = "noneditable";
 481
 482   ui_out_field_string (uiout, "attr", attstr);
 483   return MI_CMD_DONE;
 484 }
 485
 486 enum mi_cmd_result
 487 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 488 {
 489   struct varobj *var;
 490
 491   if (argc != 1)
 492     error (_("mi_cmd_var_evaluate_expression: Usage: NAME."));
 493
 494   /* Get varobj handle, if a valid var obj name was specified */
 495   var = varobj_get_handle (argv[0]);
 496   if (var == NULL)
 497     error (_("mi_cmd_var_evaluate_expression: Variable object not found"));
 498
 499   ui_out_field_string (uiout, "value", varobj_get_value (var));
 500   return MI_CMD_DONE;
 501 }
 502
 503 enum mi_cmd_result
 504 mi_cmd_var_assign (char *command, char **argv, int argc)
 505 {
 506   struct varobj *var;
 507   char *expression;
 508
 509   if (argc != 2)
 510     error (_("mi_cmd_var_assign: Usage: NAME EXPRESSION."));
 511
 512   /* Get varobj handle, if a valid var obj name was specified */
 513   var = varobj_get_handle (argv[0]);
 514   if (var == NULL)
 515     error (_("mi_cmd_var_assign: Variable object not found"));
 516
 517   if (!varobj_editable_p (var))
 518     error (_("mi_cmd_var_assign: Variable object is not editable"));
 519
 520   expression = xstrdup (argv[1]);
 521
 522   if (!varobj_set_value (var, expression))
 523     error (_("mi_cmd_var_assign: Could not assign expression to variable object"));
 524
 525   ui_out_field_string (uiout, "value", varobj_get_value (var));
 526   return MI_CMD_DONE;
 527 }
 528
 529 enum mi_cmd_result
 530 mi_cmd_var_update (char *command, char **argv, int argc)
 531 {
 532   struct varobj *var;
 533   struct varobj **rootlist;
 534   struct varobj **cr;
 535   struct cleanup *cleanup;
 536   char *name;
 537   int nv;
 538   enum print_values print_values;
 539
 540   if (argc != 1 && argc != 2)
 541     error (_("mi_cmd_var_update: Usage: [PRINT_VALUES] NAME."));
 542
 543   if (argc == 1)
 544     name = argv[0];
 545   else
 546     name = (argv[1]);
 547
 548   if (argc == 2)
 549     print_values = mi_parse_values_option (argv[0]);
 550   else
 551     print_values = PRINT_NO_VALUES;
 552
 553   /* Check if the parameter is a "*" which means that we want
 554      to update all variables */
 555
 556   if ((*name == '*') && (*(name + 1) == '\0'))
 557     {
 558       nv = varobj_list (&rootlist);
 559       cleanup = make_cleanup (xfree, rootlist);
 560       if (mi_version (uiout) <= 1)
 561         make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 562       else
 563         make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 564       if (nv <= 0)
 565         {
 566           do_cleanups (cleanup);
 567           return MI_CMD_DONE;
 568         }
 569       cr = rootlist;
 570       while (*cr != NULL)
 571         {
 572           varobj_update_one (*cr, print_values, 0 /* implicit */);
 573           cr++;
 574         }
 575       do_cleanups (cleanup);
 576     }
 577   else
 578     {
 579       /* Get varobj handle, if a valid var obj name was specified */
 580       var = varobj_get_handle (name);
 581       if (var == NULL)
 582         error (_("mi_cmd_var_update: Variable object not found"));
 583
 584       if (mi_version (uiout) <= 1)
 585         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 586       else
 587         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 588       varobj_update_one (var, print_values, 1 /* explicit */);
 589       do_cleanups (cleanup);
 590     }
 591     return MI_CMD_DONE;
 592 }
 593
 594 /* Helper for mi_cmd_var_update().  */
 595
 596 static void
 597 varobj_update_one (struct varobj *var, enum print_values print_values,
 598                    int explicit)
 599 {
 600   struct varobj **changelist;
 601   struct varobj **cc;
 602   struct cleanup *cleanup = NULL;
 603   int nc;
 604
 605   nc = varobj_update (&var, &changelist, explicit);
 606
 607   /* nc >= 0  represents the number of changes reported into changelist.
 608      nc < 0   means that an error occured or the the variable has
 609               changed type (TYPE_CHANGED).  */
 610
 611   if (nc == 0)
 612     return;
 613   else if (nc < 0)
 614     {
 615       if (mi_version (uiout) > 1)
 616         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 617       ui_out_field_string (uiout, "name", varobj_get_objname(var));
 618
 619       switch (nc)
 620       {
 621         case NOT_IN_SCOPE:
 622           ui_out_field_string (uiout, "in_scope", "false");
 623           break;
 624         case INVALID:
 625           ui_out_field_string (uiout, "in_scope", "invalid");
 626           break;
 627         case TYPE_CHANGED:
 628           ui_out_field_string (uiout, "in_scope", "true");
 629           ui_out_field_string (uiout, "new_type", varobj_get_type(var));
 630           ui_out_field_int (uiout, "new_num_children",
 631                             varobj_get_num_children(var));
 632           break;
 633       }
 634       if (mi_version (uiout) > 1)
 635         do_cleanups (cleanup);
 636     }
 637   else
 638     {
 639       cc = changelist;
 640       while (*cc != NULL)
 641         {
 642           if (mi_version (uiout) > 1)
 643             cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 644           ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 645           if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
 646             ui_out_field_string (uiout, "value", varobj_get_value (*cc));
 647           ui_out_field_string (uiout, "in_scope", "true");
 648           ui_out_field_string (uiout, "type_changed", "false");
 649           if (mi_version (uiout) > 1)
 650             do_cleanups (cleanup);
 651           cc++;
 652         }
 653       xfree (changelist);
 654     }
 655 }