gdb/mi/mi-cmd-var.c

   1 /* MI Command Set - varobj commands.
   2
   3    Copyright (C) 2000, 2002, 2004, 2005, 2007 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 void varobj_update_one (struct varobj *var,
  40                               enum print_values print_values,
  41                               int explicit);
  42
  43 static int mi_print_value_p (struct type *type, enum print_values print_values);
  44
  45 /* Print variable object VAR.  The PRINT_VALUES parameter controls
  46    if the value should be printed.  The PRINT_EXPRESSION parameter
  47    controls if the expression should be printed.  */
  48 static void
  49 print_varobj (struct varobj *var, enum print_values print_values,
  50               int print_expression)
  51 {
  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   char *expr;
 143   struct varobj *var;
 144   int numdel;
 145   int children_only_p = 0;
 146   struct cleanup *old_cleanups;
 147
 148   if (argc < 1 || argc > 2)
 149     error (_("mi_cmd_var_delete: Usage: [-c] EXPRESSION."));
 150
 151   name = xstrdup (argv[0]);
 152   /* Add cleanup for name. Must be free_current_contents as
 153      name can be reallocated */
 154   old_cleanups = make_cleanup (free_current_contents, &name);
 155
 156   /* If we have one single argument it cannot be '-c' or any string
 157      starting with '-'. */
 158   if (argc == 1)
 159     {
 160       if (strcmp (name, "-c") == 0)
 161         error (_("mi_cmd_var_delete: Missing required argument after '-c': variable object name"));
 162       if (*name == '-')
 163         error (_("mi_cmd_var_delete: Illegal variable object name"));
 164     }
 165
 166   /* If we have 2 arguments they must be '-c' followed by a string
 167      which would be the variable name. */
 168   if (argc == 2)
 169     {
 170       expr = xstrdup (argv[1]);
 171       if (strcmp (name, "-c") != 0)
 172         error (_("mi_cmd_var_delete: Invalid option."));
 173       children_only_p = 1;
 174       xfree (name);
 175       name = xstrdup (expr);
 176       xfree (expr);
 177     }
 178
 179   /* If we didn't error out, now NAME contains the name of the
 180      variable. */
 181
 182   var = varobj_get_handle (name);
 183
 184   if (var == NULL)
 185     error (_("mi_cmd_var_delete: Variable object not found."));
 186
 187   numdel = varobj_delete (var, NULL, children_only_p);
 188
 189   ui_out_field_int (uiout, "ndeleted", numdel);
 190
 191   do_cleanups (old_cleanups);
 192   return MI_CMD_DONE;
 193 }
 194
 195 enum mi_cmd_result
 196 mi_cmd_var_set_format (char *command, char **argv, int argc)
 197 {
 198   enum varobj_display_formats format;
 199   int len;
 200   struct varobj *var;
 201   char *formspec;
 202
 203   if (argc != 2)
 204     error (_("mi_cmd_var_set_format: Usage: NAME FORMAT."));
 205
 206   /* Get varobj handle, if a valid var obj name was specified */
 207   var = varobj_get_handle (argv[0]);
 208
 209   if (var == NULL)
 210     error (_("mi_cmd_var_set_format: Variable object not found"));
 211
 212   formspec = xstrdup (argv[1]);
 213   if (formspec == NULL)
 214     error (_("mi_cmd_var_set_format: Must specify the format as: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 215
 216   len = strlen (formspec);
 217
 218   if (strncmp (formspec, "natural", len) == 0)
 219     format = FORMAT_NATURAL;
 220   else if (strncmp (formspec, "binary", len) == 0)
 221     format = FORMAT_BINARY;
 222   else if (strncmp (formspec, "decimal", len) == 0)
 223     format = FORMAT_DECIMAL;
 224   else if (strncmp (formspec, "hexadecimal", len) == 0)
 225     format = FORMAT_HEXADECIMAL;
 226   else if (strncmp (formspec, "octal", len) == 0)
 227     format = FORMAT_OCTAL;
 228   else
 229     error (_("mi_cmd_var_set_format: Unknown display format: must be: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 230
 231   /* Set the format of VAR to given format */
 232   varobj_set_display_format (var, format);
 233
 234   /* Report the new 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_set_frozen (char *command, char **argv, int argc)
 241 {
 242   struct varobj *var;
 243   int frozen;
 244
 245   if (argc != 2)
 246     error (_("-var-set-format: Usage: NAME FROZEN_FLAG."));
 247
 248   var = varobj_get_handle (argv[0]);
 249   if (var == NULL)
 250     error (_("Variable object not found"));
 251
 252   if (strcmp (argv[1], "0") == 0)
 253     frozen = 0;
 254   else if (strcmp (argv[1], "1") == 0)
 255     frozen = 1;
 256   else
 257     error (_("Invalid flag value"));
 258
 259   varobj_set_frozen (var, frozen);
 260
 261   /* We don't automatically return the new value, or what varobjs got new
 262      values during unfreezing.  If this information is required, client
 263      should call -var-update explicitly.  */
 264   return MI_CMD_DONE;
 265 }
 266
 267
 268 enum mi_cmd_result
 269 mi_cmd_var_show_format (char *command, char **argv, int argc)
 270 {
 271   enum varobj_display_formats format;
 272   struct varobj *var;
 273
 274   if (argc != 1)
 275     error (_("mi_cmd_var_show_format: Usage: NAME."));
 276
 277   /* Get varobj handle, if a valid var obj name was specified */
 278   var = varobj_get_handle (argv[0]);
 279   if (var == NULL)
 280     error (_("mi_cmd_var_show_format: Variable object not found"));
 281
 282   format = varobj_get_display_format (var);
 283
 284   /* Report the current format */
 285   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 286   return MI_CMD_DONE;
 287 }
 288
 289 enum mi_cmd_result
 290 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 291 {
 292   struct varobj *var;
 293
 294   if (argc != 1)
 295     error (_("mi_cmd_var_info_num_children: Usage: NAME."));
 296
 297   /* Get varobj handle, if a valid var obj name was specified */
 298   var = varobj_get_handle (argv[0]);
 299   if (var == NULL)
 300     error (_("mi_cmd_var_info_num_children: Variable object not found"));
 301
 302   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 303   return MI_CMD_DONE;
 304 }
 305
 306 /* Parse a string argument into a print_values value.  */
 307
 308 static enum print_values
 309 mi_parse_values_option (const char *arg)
 310 {
 311   if (strcmp (arg, "0") == 0
 312       || strcmp (arg, mi_no_values) == 0)
 313     return PRINT_NO_VALUES;
 314   else if (strcmp (arg, "1") == 0
 315            || strcmp (arg, mi_all_values) == 0)
 316     return PRINT_ALL_VALUES;
 317   else if (strcmp (arg, "2") == 0
 318            || strcmp (arg, mi_simple_values) == 0)
 319     return PRINT_SIMPLE_VALUES;
 320   else
 321     error (_("Unknown value for PRINT_VALUES\n\
 322 Must be: 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
 323            mi_no_values, mi_simple_values, mi_all_values);
 324 }
 325
 326 /* Return 1 if given the argument PRINT_VALUES we should display
 327    a value of type TYPE.  */
 328
 329 static int
 330 mi_print_value_p (struct type *type, enum print_values print_values)
 331 {
 332   if (type != NULL)
 333     type = check_typedef (type);
 334
 335   if (print_values == PRINT_NO_VALUES)
 336     return 0;
 337
 338   if (print_values == PRINT_ALL_VALUES)
 339     return 1;
 340
 341   /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 342      and that type is not a compound type.  */
 343
 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 enum mi_cmd_result
 350 mi_cmd_var_list_children (char *command, char **argv, int argc)
 351 {
 352   struct varobj *var;
 353   struct varobj **childlist;
 354   struct varobj **cc;
 355   struct cleanup *cleanup_children;
 356   int numchild;
 357   enum print_values print_values;
 358
 359   if (argc != 1 && argc != 2)
 360     error (_("mi_cmd_var_list_children: Usage: [PRINT_VALUES] NAME"));
 361
 362   /* Get varobj handle, if a valid var obj name was specified */
 363   if (argc == 1)
 364     var = varobj_get_handle (argv[0]);
 365   else
 366     var = varobj_get_handle (argv[1]);
 367   if (var == NULL)
 368     error (_("Variable object not found"));
 369
 370   numchild = varobj_list_children (var, &childlist);
 371   ui_out_field_int (uiout, "numchild", numchild);
 372   if (argc == 2)
 373     print_values = mi_parse_values_option (argv[0]);
 374   else
 375     print_values = PRINT_NO_VALUES;
 376
 377   if (numchild <= 0)
 378     return MI_CMD_DONE;
 379
 380   if (mi_version (uiout) == 1)
 381     cleanup_children = make_cleanup_ui_out_tuple_begin_end (uiout, "children");
 382   else
 383     cleanup_children = make_cleanup_ui_out_list_begin_end (uiout, "children");
 384   cc = childlist;
 385   while (*cc != NULL)
 386     {
 387       struct cleanup *cleanup_child;
 388       cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
 389       print_varobj (*cc, print_values, 1 /* print expression */);
 390       cc++;
 391       do_cleanups (cleanup_child);
 392     }
 393   do_cleanups (cleanup_children);
 394   xfree (childlist);
 395   return MI_CMD_DONE;
 396 }
 397
 398 enum mi_cmd_result
 399 mi_cmd_var_info_type (char *command, char **argv, int argc)
 400 {
 401   struct varobj *var;
 402
 403   if (argc != 1)
 404     error (_("mi_cmd_var_info_type: Usage: NAME."));
 405
 406   /* Get varobj handle, if a valid var obj name was specified */
 407   var = varobj_get_handle (argv[0]);
 408   if (var == NULL)
 409     error (_("mi_cmd_var_info_type: Variable object not found"));
 410
 411   ui_out_field_string (uiout, "type", varobj_get_type (var));
 412   return MI_CMD_DONE;
 413 }
 414
 415 enum mi_cmd_result
 416 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 417 {
 418   enum varobj_languages lang;
 419   struct varobj *var;
 420
 421   if (argc != 1)
 422     error (_("mi_cmd_var_info_expression: Usage: NAME."));
 423
 424   /* Get varobj handle, if a valid var obj name was specified */
 425   var = varobj_get_handle (argv[0]);
 426   if (var == NULL)
 427     error (_("mi_cmd_var_info_expression: Variable object not found"));
 428
 429   lang = varobj_get_language (var);
 430
 431   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 432   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 433   return MI_CMD_DONE;
 434 }
 435
 436 enum mi_cmd_result
 437 mi_cmd_var_show_attributes (char *command, char **argv, int argc)
 438 {
 439   int attr;
 440   char *attstr;
 441   struct varobj *var;
 442
 443   if (argc != 1)
 444     error (_("mi_cmd_var_show_attributes: Usage: NAME."));
 445
 446   /* Get varobj handle, if a valid var obj name was specified */
 447   var = varobj_get_handle (argv[0]);
 448   if (var == NULL)
 449     error (_("mi_cmd_var_show_attributes: Variable object not found"));
 450
 451   attr = varobj_get_attributes (var);
 452   /* FIXME: define masks for attributes */
 453   if (attr & 0x00000001)
 454     attstr = "editable";
 455   else
 456     attstr = "noneditable";
 457
 458   ui_out_field_string (uiout, "attr", attstr);
 459   return MI_CMD_DONE;
 460 }
 461
 462 enum mi_cmd_result
 463 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 464 {
 465   struct varobj *var;
 466
 467   if (argc != 1)
 468     error (_("mi_cmd_var_evaluate_expression: 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_evaluate_expression: Variable object not found"));
 474
 475   ui_out_field_string (uiout, "value", varobj_get_value (var));
 476   return MI_CMD_DONE;
 477 }
 478
 479 enum mi_cmd_result
 480 mi_cmd_var_assign (char *command, char **argv, int argc)
 481 {
 482   struct varobj *var;
 483   char *expression;
 484
 485   if (argc != 2)
 486     error (_("mi_cmd_var_assign: Usage: NAME EXPRESSION."));
 487
 488   /* Get varobj handle, if a valid var obj name was specified */
 489   var = varobj_get_handle (argv[0]);
 490   if (var == NULL)
 491     error (_("mi_cmd_var_assign: Variable object not found"));
 492
 493   /* FIXME: define masks for attributes */
 494   if (!(varobj_get_attributes (var) & 0x00000001))
 495     error (_("mi_cmd_var_assign: Variable object is not editable"));
 496
 497   expression = xstrdup (argv[1]);
 498
 499   if (!varobj_set_value (var, expression))
 500     error (_("mi_cmd_var_assign: Could not assign expression to varible object"));
 501
 502   ui_out_field_string (uiout, "value", varobj_get_value (var));
 503   return MI_CMD_DONE;
 504 }
 505
 506 enum mi_cmd_result
 507 mi_cmd_var_update (char *command, char **argv, int argc)
 508 {
 509   struct varobj *var;
 510   struct varobj **rootlist;
 511   struct varobj **cr;
 512   struct cleanup *cleanup;
 513   char *name;
 514   int nv;
 515   enum print_values print_values;
 516
 517   if (argc != 1 && argc != 2)
 518     error (_("mi_cmd_var_update: Usage: [PRINT_VALUES] NAME."));
 519
 520   if (argc == 1)
 521     name = argv[0];
 522   else
 523     name = (argv[1]);
 524
 525   if (argc == 2)
 526     print_values = mi_parse_values_option (argv[0]);
 527   else
 528     print_values = PRINT_NO_VALUES;
 529
 530   /* Check if the parameter is a "*" which means that we want
 531      to update all variables */
 532
 533   if ((*name == '*') && (*(name + 1) == '\0'))
 534     {
 535       nv = varobj_list (&rootlist);
 536       cleanup = make_cleanup (xfree, rootlist);
 537       if (mi_version (uiout) <= 1)
 538         make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 539       else
 540         make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 541       if (nv <= 0)
 542         {
 543           do_cleanups (cleanup);
 544           return MI_CMD_DONE;
 545         }
 546       cr = rootlist;
 547       while (*cr != NULL)
 548         {
 549           varobj_update_one (*cr, print_values, 0 /* implicit */);
 550           cr++;
 551         }
 552       do_cleanups (cleanup);
 553     }
 554   else
 555     {
 556       /* Get varobj handle, if a valid var obj name was specified */
 557       var = varobj_get_handle (name);
 558       if (var == NULL)
 559         error (_("mi_cmd_var_update: Variable object not found"));
 560
 561       if (mi_version (uiout) <= 1)
 562         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 563       else
 564         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 565       varobj_update_one (var, print_values, 1 /* explicit */);
 566       do_cleanups (cleanup);
 567     }
 568     return MI_CMD_DONE;
 569 }
 570
 571 /* Helper for mi_cmd_var_update().  */
 572
 573 static void
 574 varobj_update_one (struct varobj *var, enum print_values print_values,
 575                    int explicit)
 576 {
 577   struct varobj **changelist;
 578   struct varobj **cc;
 579   struct cleanup *cleanup = NULL;
 580   int nc;
 581
 582   nc = varobj_update (&var, &changelist, explicit);
 583
 584   /* nc >= 0  represents the number of changes reported into changelist.
 585      nc < 0   means that an error occured or the the variable has
 586               changed type (TYPE_CHANGED).  */
 587
 588   if (nc == 0)
 589     return;
 590   else if (nc < 0)
 591     {
 592       if (mi_version (uiout) > 1)
 593         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 594       ui_out_field_string (uiout, "name", varobj_get_objname(var));
 595
 596       switch (nc)
 597       {
 598         case NOT_IN_SCOPE:
 599           ui_out_field_string (uiout, "in_scope", "false");
 600           break;
 601         case INVALID:
 602           ui_out_field_string (uiout, "in_scope", "invalid");
 603           break;
 604         case TYPE_CHANGED:
 605           ui_out_field_string (uiout, "in_scope", "true");
 606           ui_out_field_string (uiout, "new_type", varobj_get_type(var));
 607           ui_out_field_int (uiout, "new_num_children",
 608                             varobj_get_num_children(var));
 609           break;
 610       }
 611       if (mi_version (uiout) > 1)
 612         do_cleanups (cleanup);
 613     }
 614   else
 615     {
 616       cc = changelist;
 617       while (*cc != NULL)
 618         {
 619           if (mi_version (uiout) > 1)
 620             cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 621           ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 622           if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
 623             ui_out_field_string (uiout, "value", varobj_get_value (*cc));
 624           ui_out_field_string (uiout, "in_scope", "true");
 625           ui_out_field_string (uiout, "type_changed", "false");
 626           if (mi_version (uiout) > 1)
 627             do_cleanups (cleanup);
 628           cc++;
 629         }
 630       xfree (changelist);
 631     }
 632 }