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   int thread_id;
  54
  55   ui_out_field_string (uiout, "name", varobj_get_objname (var));
  56   if (print_expression)
  57     ui_out_field_string (uiout, "exp", varobj_get_expression (var));
  58   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
  59
  60   if (mi_print_value_p (varobj_get_gdb_type (var), print_values))
  61     ui_out_field_string (uiout, "value", varobj_get_value (var));
  62
  63   type = varobj_get_type (var);
  64   if (type != NULL)
  65     {
  66       ui_out_field_string (uiout, "type", type);
  67       xfree (type);
  68     }
  69
  70   thread_id = varobj_get_thread_id (var);
  71   if (thread_id > 0)
  72     ui_out_field_int (uiout, "thread-id", thread_id);
  73
  74   if (varobj_get_frozen (var))
  75     ui_out_field_int (uiout, "frozen", 1);
  76 }
  77
  78 /* VAROBJ operations */
  79
  80 enum mi_cmd_result
  81 mi_cmd_var_create (char *command, char **argv, int argc)
  82 {
  83   CORE_ADDR frameaddr = 0;
  84   struct varobj *var;
  85   char *name;
  86   char *frame;
  87   char *expr;
  88   struct cleanup *old_cleanups;
  89   enum varobj_type var_type;
  90
  91   if (argc != 3)
  92     {
  93       /* mi_error_message = xstrprintf ("mi_cmd_var_create: Usage:
  94          ...."); return MI_CMD_ERROR; */
  95       error (_("mi_cmd_var_create: Usage: NAME FRAME EXPRESSION."));
  96     }
  97
  98   name = xstrdup (argv[0]);
  99   /* Add cleanup for name. Must be free_current_contents as
 100      name can be reallocated */
 101   old_cleanups = make_cleanup (free_current_contents, &name);
 102
 103   frame = xstrdup (argv[1]);
 104   make_cleanup (xfree, frame);
 105
 106   expr = xstrdup (argv[2]);
 107   make_cleanup (xfree, expr);
 108
 109   if (strcmp (name, "-") == 0)
 110     {
 111       xfree (name);
 112       name = varobj_gen_name ();
 113     }
 114   else if (!isalpha (*name))
 115     error (_("mi_cmd_var_create: name of object must begin with a letter"));
 116
 117   if (strcmp (frame, "*") == 0)
 118     var_type = USE_CURRENT_FRAME;
 119   else if (strcmp (frame, "@") == 0)
 120     var_type = USE_SELECTED_FRAME;
 121   else
 122     {
 123       var_type = USE_SPECIFIED_FRAME;
 124       frameaddr = string_to_core_addr (frame);
 125     }
 126
 127   if (varobjdebug)
 128     fprintf_unfiltered (gdb_stdlog,
 129                     "Name=\"%s\", Frame=\"%s\" (0x%s), Expression=\"%s\"\n",
 130                         name, frame, paddr (frameaddr), expr);
 131
 132   var = varobj_create (name, expr, frameaddr, var_type);
 133
 134   if (var == NULL)
 135     error (_("mi_cmd_var_create: unable to create variable object"));
 136
 137   print_varobj (var, PRINT_ALL_VALUES, 0 /* don't print expression */);
 138
 139   do_cleanups (old_cleanups);
 140   return MI_CMD_DONE;
 141 }
 142
 143 enum mi_cmd_result
 144 mi_cmd_var_delete (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 cleanup *old_cleanups;
 151
 152   if (argc < 1 || argc > 2)
 153     error (_("mi_cmd_var_delete: Usage: [-c] EXPRESSION."));
 154
 155   name = xstrdup (argv[0]);
 156   /* Add cleanup for name. Must be free_current_contents as
 157      name can be reallocated */
 158   old_cleanups = make_cleanup (free_current_contents, &name);
 159
 160   /* If we have one single argument it cannot be '-c' or any string
 161      starting with '-'. */
 162   if (argc == 1)
 163     {
 164       if (strcmp (name, "-c") == 0)
 165         error (_("mi_cmd_var_delete: Missing required argument after '-c': variable object name"));
 166       if (*name == '-')
 167         error (_("mi_cmd_var_delete: Illegal variable object name"));
 168     }
 169
 170   /* If we have 2 arguments they must be '-c' followed by a string
 171      which would be the variable name. */
 172   if (argc == 2)
 173     {
 174       if (strcmp (name, "-c") != 0)
 175         error (_("mi_cmd_var_delete: Invalid option."));
 176       children_only_p = 1;
 177       do_cleanups (old_cleanups);
 178       name = xstrdup (argv[1]);
 179       make_cleanup (free_current_contents, &name);
 180     }
 181
 182   /* If we didn't error out, now NAME contains the name of the
 183      variable. */
 184
 185   var = varobj_get_handle (name);
 186
 187   if (var == NULL)
 188     error (_("mi_cmd_var_delete: Variable object not found."));
 189
 190   numdel = varobj_delete (var, NULL, children_only_p);
 191
 192   ui_out_field_int (uiout, "ndeleted", numdel);
 193
 194   do_cleanups (old_cleanups);
 195   return MI_CMD_DONE;
 196 }
 197
 198 enum mi_cmd_result
 199 mi_cmd_var_set_format (char *command, char **argv, int argc)
 200 {
 201   enum varobj_display_formats format;
 202   int len;
 203   struct varobj *var;
 204   char *formspec;
 205
 206   if (argc != 2)
 207     error (_("mi_cmd_var_set_format: Usage: NAME FORMAT."));
 208
 209   /* Get varobj handle, if a valid var obj name was specified */
 210   var = varobj_get_handle (argv[0]);
 211
 212   if (var == NULL)
 213     error (_("mi_cmd_var_set_format: Variable object not found"));
 214
 215   formspec = argv[1];
 216   if (formspec == NULL)
 217     error (_("mi_cmd_var_set_format: Must specify the format as: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 218
 219   len = strlen (formspec);
 220
 221   if (strncmp (formspec, "natural", len) == 0)
 222     format = FORMAT_NATURAL;
 223   else if (strncmp (formspec, "binary", len) == 0)
 224     format = FORMAT_BINARY;
 225   else if (strncmp (formspec, "decimal", len) == 0)
 226     format = FORMAT_DECIMAL;
 227   else if (strncmp (formspec, "hexadecimal", len) == 0)
 228     format = FORMAT_HEXADECIMAL;
 229   else if (strncmp (formspec, "octal", len) == 0)
 230     format = FORMAT_OCTAL;
 231   else
 232     error (_("mi_cmd_var_set_format: Unknown display format: must be: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 233
 234   /* Set the format of VAR to given format */
 235   varobj_set_display_format (var, format);
 236
 237   /* Report the new current format */
 238   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 239
 240   /* Report the value in the new format */
 241   ui_out_field_string (uiout, "value", varobj_get_value (var));
 242   return MI_CMD_DONE;
 243 }
 244
 245 enum mi_cmd_result
 246 mi_cmd_var_set_frozen (char *command, char **argv, int argc)
 247 {
 248   struct varobj *var;
 249   int frozen;
 250
 251   if (argc != 2)
 252     error (_("-var-set-format: Usage: NAME FROZEN_FLAG."));
 253
 254   var = varobj_get_handle (argv[0]);
 255   if (var == NULL)
 256     error (_("Variable object not found"));
 257
 258   if (strcmp (argv[1], "0") == 0)
 259     frozen = 0;
 260   else if (strcmp (argv[1], "1") == 0)
 261     frozen = 1;
 262   else
 263     error (_("Invalid flag value"));
 264
 265   varobj_set_frozen (var, frozen);
 266
 267   /* We don't automatically return the new value, or what varobjs got new
 268      values during unfreezing.  If this information is required, client
 269      should call -var-update explicitly.  */
 270   return MI_CMD_DONE;
 271 }
 272
 273
 274 enum mi_cmd_result
 275 mi_cmd_var_show_format (char *command, char **argv, int argc)
 276 {
 277   enum varobj_display_formats format;
 278   struct varobj *var;
 279
 280   if (argc != 1)
 281     error (_("mi_cmd_var_show_format: Usage: NAME."));
 282
 283   /* Get varobj handle, if a valid var obj name was specified */
 284   var = varobj_get_handle (argv[0]);
 285   if (var == NULL)
 286     error (_("mi_cmd_var_show_format: Variable object not found"));
 287
 288   format = varobj_get_display_format (var);
 289
 290   /* Report the current format */
 291   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 292   return MI_CMD_DONE;
 293 }
 294
 295 enum mi_cmd_result
 296 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 297 {
 298   struct varobj *var;
 299
 300   if (argc != 1)
 301     error (_("mi_cmd_var_info_num_children: Usage: NAME."));
 302
 303   /* Get varobj handle, if a valid var obj name was specified */
 304   var = varobj_get_handle (argv[0]);
 305   if (var == NULL)
 306     error (_("mi_cmd_var_info_num_children: Variable object not found"));
 307
 308   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 309   return MI_CMD_DONE;
 310 }
 311
 312 /* Parse a string argument into a print_values value.  */
 313
 314 static enum print_values
 315 mi_parse_values_option (const char *arg)
 316 {
 317   if (strcmp (arg, "0") == 0
 318       || strcmp (arg, mi_no_values) == 0)
 319     return PRINT_NO_VALUES;
 320   else if (strcmp (arg, "1") == 0
 321            || strcmp (arg, mi_all_values) == 0)
 322     return PRINT_ALL_VALUES;
 323   else if (strcmp (arg, "2") == 0
 324            || strcmp (arg, mi_simple_values) == 0)
 325     return PRINT_SIMPLE_VALUES;
 326   else
 327     error (_("Unknown value for PRINT_VALUES\n\
 328 Must be: 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
 329            mi_no_values, mi_simple_values, mi_all_values);
 330 }
 331
 332 /* Return 1 if given the argument PRINT_VALUES we should display
 333    a value of type TYPE.  */
 334
 335 static int
 336 mi_print_value_p (struct type *type, enum print_values print_values)
 337 {
 338
 339   if (print_values == PRINT_NO_VALUES)
 340     return 0;
 341
 342   if (print_values == PRINT_ALL_VALUES)
 343     return 1;
 344
 345   if (type == NULL)
 346     return 1;
 347   else
 348     {
 349       type = check_typedef (type);
 350
 351       /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 352          and that type is not a compound type.  */
 353       return (TYPE_CODE (type) != TYPE_CODE_ARRAY
 354               && TYPE_CODE (type) != TYPE_CODE_STRUCT
 355               && TYPE_CODE (type) != TYPE_CODE_UNION);
 356     }
 357 }
 358
 359 enum mi_cmd_result
 360 mi_cmd_var_list_children (char *command, char **argv, int argc)
 361 {
 362   struct varobj *var;
 363   VEC(varobj_p) *children;
 364   struct varobj *child;
 365   struct cleanup *cleanup_children;
 366   int numchild;
 367   enum print_values print_values;
 368   int ix;
 369
 370   if (argc != 1 && argc != 2)
 371     error (_("mi_cmd_var_list_children: Usage: [PRINT_VALUES] NAME"));
 372
 373   /* Get varobj handle, if a valid var obj name was specified */
 374   if (argc == 1)
 375     var = varobj_get_handle (argv[0]);
 376   else
 377     var = varobj_get_handle (argv[1]);
 378   if (var == NULL)
 379     error (_("Variable object not found"));
 380
 381   children = varobj_list_children (var);
 382   ui_out_field_int (uiout, "numchild", VEC_length (varobj_p, children));
 383   if (argc == 2)
 384     print_values = mi_parse_values_option (argv[0]);
 385   else
 386     print_values = PRINT_NO_VALUES;
 387
 388   if (VEC_length (varobj_p, children) == 0)
 389     return MI_CMD_DONE;
 390
 391   if (mi_version (uiout) == 1)
 392     cleanup_children = make_cleanup_ui_out_tuple_begin_end (uiout, "children");
 393   else
 394     cleanup_children = make_cleanup_ui_out_list_begin_end (uiout, "children");
 395   for (ix = 0; VEC_iterate (varobj_p, children, ix, child); ++ix)
 396     {
 397       struct cleanup *cleanup_child;
 398       cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
 399       print_varobj (child, print_values, 1 /* print expression */);
 400       do_cleanups (cleanup_child);
 401     }
 402   do_cleanups (cleanup_children);
 403   return MI_CMD_DONE;
 404 }
 405
 406 enum mi_cmd_result
 407 mi_cmd_var_info_type (char *command, char **argv, int argc)
 408 {
 409   struct varobj *var;
 410
 411   if (argc != 1)
 412     error (_("mi_cmd_var_info_type: Usage: NAME."));
 413
 414   /* Get varobj handle, if a valid var obj name was specified */
 415   var = varobj_get_handle (argv[0]);
 416   if (var == NULL)
 417     error (_("mi_cmd_var_info_type: Variable object not found"));
 418
 419   ui_out_field_string (uiout, "type", varobj_get_type (var));
 420   return MI_CMD_DONE;
 421 }
 422
 423 enum mi_cmd_result
 424 mi_cmd_var_info_path_expression (char *command, char **argv, int argc)
 425 {
 426   struct varobj *var;
 427   char *path_expr;
 428
 429   if (argc != 1)
 430     error (_("Usage: NAME."));
 431
 432   /* Get varobj handle, if a valid var obj name was specified.  */
 433   var = varobj_get_handle (argv[0]);
 434   if (var == NULL)
 435     error (_("Variable object not found"));
 436
 437   path_expr = varobj_get_path_expr (var);
 438
 439   ui_out_field_string (uiout, "path_expr", path_expr);
 440
 441   return MI_CMD_DONE;
 442 }
 443
 444 enum mi_cmd_result
 445 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 446 {
 447   enum varobj_languages lang;
 448   struct varobj *var;
 449
 450   if (argc != 1)
 451     error (_("mi_cmd_var_info_expression: Usage: NAME."));
 452
 453   /* Get varobj handle, if a valid var obj name was specified */
 454   var = varobj_get_handle (argv[0]);
 455   if (var == NULL)
 456     error (_("mi_cmd_var_info_expression: Variable object not found"));
 457
 458   lang = varobj_get_language (var);
 459
 460   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 461   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 462   return MI_CMD_DONE;
 463 }
 464
 465 enum mi_cmd_result
 466 mi_cmd_var_show_attributes (char *command, char **argv, int argc)
 467 {
 468   int attr;
 469   char *attstr;
 470   struct varobj *var;
 471
 472   if (argc != 1)
 473     error (_("mi_cmd_var_show_attributes: Usage: NAME."));
 474
 475   /* Get varobj handle, if a valid var obj name was specified */
 476   var = varobj_get_handle (argv[0]);
 477   if (var == NULL)
 478     error (_("mi_cmd_var_show_attributes: Variable object not found"));
 479
 480   attr = varobj_get_attributes (var);
 481   /* FIXME: define masks for attributes */
 482   if (attr & 0x00000001)
 483     attstr = "editable";
 484   else
 485     attstr = "noneditable";
 486
 487   ui_out_field_string (uiout, "attr", attstr);
 488   return MI_CMD_DONE;
 489 }
 490
 491 enum mi_cmd_result
 492 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 493 {
 494   struct varobj *var;
 495
 496   if (argc != 1)
 497     error (_("mi_cmd_var_evaluate_expression: Usage: NAME."));
 498
 499   /* Get varobj handle, if a valid var obj name was specified */
 500   var = varobj_get_handle (argv[0]);
 501   if (var == NULL)
 502     error (_("mi_cmd_var_evaluate_expression: Variable object not found"));
 503
 504   ui_out_field_string (uiout, "value", varobj_get_value (var));
 505   return MI_CMD_DONE;
 506 }
 507
 508 enum mi_cmd_result
 509 mi_cmd_var_assign (char *command, char **argv, int argc)
 510 {
 511   struct varobj *var;
 512   char *expression;
 513
 514   if (argc != 2)
 515     error (_("mi_cmd_var_assign: Usage: NAME EXPRESSION."));
 516
 517   /* Get varobj handle, if a valid var obj name was specified */
 518   var = varobj_get_handle (argv[0]);
 519   if (var == NULL)
 520     error (_("mi_cmd_var_assign: Variable object not found"));
 521
 522   if (!varobj_editable_p (var))
 523     error (_("mi_cmd_var_assign: Variable object is not editable"));
 524
 525   expression = xstrdup (argv[1]);
 526
 527   if (!varobj_set_value (var, expression))
 528     error (_("mi_cmd_var_assign: Could not assign expression to variable object"));
 529
 530   ui_out_field_string (uiout, "value", varobj_get_value (var));
 531   return MI_CMD_DONE;
 532 }
 533
 534 enum mi_cmd_result
 535 mi_cmd_var_update (char *command, char **argv, int argc)
 536 {
 537   struct varobj *var;
 538   struct varobj **rootlist;
 539   struct varobj **cr;
 540   struct cleanup *cleanup;
 541   char *name;
 542   int nv;
 543   enum print_values print_values;
 544
 545   if (argc != 1 && argc != 2)
 546     error (_("mi_cmd_var_update: Usage: [PRINT_VALUES] NAME."));
 547
 548   if (argc == 1)
 549     name = argv[0];
 550   else
 551     name = (argv[1]);
 552
 553   if (argc == 2)
 554     print_values = mi_parse_values_option (argv[0]);
 555   else
 556     print_values = PRINT_NO_VALUES;
 557
 558   /* Check if the parameter is a "*" which means that we want
 559      to update all variables */
 560
 561   if ((*name == '*') && (*(name + 1) == '\0'))
 562     {
 563       nv = varobj_list (&rootlist);
 564       cleanup = make_cleanup (xfree, rootlist);
 565       if (mi_version (uiout) <= 1)
 566         make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 567       else
 568         make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 569       if (nv <= 0)
 570         {
 571           do_cleanups (cleanup);
 572           return MI_CMD_DONE;
 573         }
 574       cr = rootlist;
 575       while (*cr != NULL)
 576         {
 577           varobj_update_one (*cr, print_values, 0 /* implicit */);
 578           cr++;
 579         }
 580       do_cleanups (cleanup);
 581     }
 582   else
 583     {
 584       /* Get varobj handle, if a valid var obj name was specified */
 585       var = varobj_get_handle (name);
 586       if (var == NULL)
 587         error (_("mi_cmd_var_update: Variable object not found"));
 588
 589       if (mi_version (uiout) <= 1)
 590         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 591       else
 592         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 593       varobj_update_one (var, print_values, 1 /* explicit */);
 594       do_cleanups (cleanup);
 595     }
 596     return MI_CMD_DONE;
 597 }
 598
 599 /* Helper for mi_cmd_var_update().  */
 600
 601 static void
 602 varobj_update_one (struct varobj *var, enum print_values print_values,
 603                    int explicit)
 604 {
 605   struct varobj **changelist;
 606   struct varobj **cc;
 607   struct cleanup *cleanup = NULL;
 608   int nc;
 609
 610   nc = varobj_update (&var, &changelist, explicit);
 611
 612   /* nc >= 0  represents the number of changes reported into changelist.
 613      nc < 0   means that an error occured or the the variable has
 614               changed type (TYPE_CHANGED).  */
 615
 616   if (nc == 0)
 617     return;
 618   else if (nc < 0)
 619     {
 620       if (mi_version (uiout) > 1)
 621         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 622       ui_out_field_string (uiout, "name", varobj_get_objname(var));
 623
 624       switch (nc)
 625       {
 626         case NOT_IN_SCOPE:
 627           ui_out_field_string (uiout, "in_scope", "false");
 628           break;
 629         case INVALID:
 630           ui_out_field_string (uiout, "in_scope", "invalid");
 631           break;
 632         case TYPE_CHANGED:
 633           ui_out_field_string (uiout, "in_scope", "true");
 634           ui_out_field_string (uiout, "new_type", varobj_get_type(var));
 635           ui_out_field_int (uiout, "new_num_children",
 636                             varobj_get_num_children(var));
 637           break;
 638       }
 639       if (mi_version (uiout) > 1)
 640         do_cleanups (cleanup);
 641     }
 642   else
 643     {
 644       cc = changelist;
 645       while (*cc != NULL)
 646         {
 647           if (mi_version (uiout) > 1)
 648             cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 649           ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 650           if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
 651             ui_out_field_string (uiout, "value", varobj_get_value (*cc));
 652           ui_out_field_string (uiout, "in_scope", "true");
 653           ui_out_field_string (uiout, "type_changed", "false");
 654           if (mi_version (uiout) > 1)
 655             do_cleanups (cleanup);
 656           cc++;
 657         }
 658       xfree (changelist);
 659     }
 660 }