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 #include "mi-getopt.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   struct type *gdb_type;
  53   char *type;
  54   int thread_id;
  55
  56   ui_out_field_string (uiout, "name", varobj_get_objname (var));
  57   if (print_expression)
  58     ui_out_field_string (uiout, "exp", varobj_get_expression (var));
  59   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
  60
  61   if (mi_print_value_p (varobj_get_gdb_type (var), print_values))
  62     ui_out_field_string (uiout, "value", varobj_get_value (var));
  63
  64   type = varobj_get_type (var);
  65   if (type != NULL)
  66     {
  67       ui_out_field_string (uiout, "type", type);
  68       xfree (type);
  69     }
  70
  71   thread_id = varobj_get_thread_id (var);
  72   if (thread_id > 0)
  73     ui_out_field_int (uiout, "thread-id", thread_id);
  74
  75   if (varobj_get_frozen (var))
  76     ui_out_field_int (uiout, "frozen", 1);
  77 }
  78
  79 /* VAROBJ operations */
  80
  81 void
  82 mi_cmd_var_create (char *command, char **argv, int argc)
  83 {
  84   CORE_ADDR frameaddr = 0;
  85   struct varobj *var;
  86   char *name;
  87   char *frame;
  88   char *expr;
  89   struct cleanup *old_cleanups;
  90   enum varobj_type var_type;
  91
  92   if (argc != 3)
  93     {
  94       /* mi_error_message = xstrprintf ("mi_cmd_var_create: Usage:
  95          ...."); return MI_CMD_ERROR; */
  96       error (_("mi_cmd_var_create: Usage: NAME FRAME EXPRESSION."));
  97     }
  98
  99   name = xstrdup (argv[0]);
 100   /* Add cleanup for name. Must be free_current_contents as
 101      name can be reallocated */
 102   old_cleanups = make_cleanup (free_current_contents, &name);
 103
 104   frame = xstrdup (argv[1]);
 105   make_cleanup (xfree, frame);
 106
 107   expr = xstrdup (argv[2]);
 108   make_cleanup (xfree, expr);
 109
 110   if (strcmp (name, "-") == 0)
 111     {
 112       xfree (name);
 113       name = varobj_gen_name ();
 114     }
 115   else if (!isalpha (*name))
 116     error (_("mi_cmd_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\" (0x%s), Expression=\"%s\"\n",
 131                         name, frame, paddr (frameaddr), expr);
 132
 133   var = varobj_create (name, expr, frameaddr, var_type);
 134
 135   if (var == NULL)
 136     error (_("mi_cmd_var_create: unable to create variable object"));
 137
 138   print_varobj (var, PRINT_ALL_VALUES, 0 /* don't print expression */);
 139
 140   do_cleanups (old_cleanups);
 141 }
 142
 143 void
 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 }
 196
 197 /* Parse a string argument into a format value.  */
 198
 199 static enum varobj_display_formats
 200 mi_parse_format (const char *arg)
 201 {
 202   if (arg != NULL)
 203     {
 204       int len;
 205
 206       len = strlen (arg);
 207
 208       if (strncmp (arg, "natural", len) == 0)
 209         return FORMAT_NATURAL;
 210       else if (strncmp (arg, "binary", len) == 0)
 211         return FORMAT_BINARY;
 212       else if (strncmp (arg, "decimal", len) == 0)
 213         return FORMAT_DECIMAL;
 214       else if (strncmp (arg, "hexadecimal", len) == 0)
 215         return FORMAT_HEXADECIMAL;
 216       else if (strncmp (arg, "octal", len) == 0)
 217         return FORMAT_OCTAL;
 218     }
 219
 220   error (_("Must specify the format as: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 221 }
 222
 223 void
 224 mi_cmd_var_set_format (char *command, char **argv, int argc)
 225 {
 226   enum varobj_display_formats format;
 227   struct varobj *var;
 228
 229   if (argc != 2)
 230     error (_("mi_cmd_var_set_format: Usage: NAME FORMAT."));
 231
 232   /* Get varobj handle, if a valid var obj name was specified */
 233   var = varobj_get_handle (argv[0]);
 234
 235   if (var == NULL)
 236     error (_("mi_cmd_var_set_format: Variable object not found"));
 237
 238   format = mi_parse_format (argv[1]);
 239
 240   /* Set the format of VAR to given format */
 241   varobj_set_display_format (var, format);
 242
 243   /* Report the new current format */
 244   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 245
 246   /* Report the value in the new format */
 247   ui_out_field_string (uiout, "value", varobj_get_value (var));
 248 }
 249
 250 void
 251 mi_cmd_var_set_frozen (char *command, char **argv, int argc)
 252 {
 253   struct varobj *var;
 254   int frozen;
 255
 256   if (argc != 2)
 257     error (_("-var-set-format: Usage: NAME FROZEN_FLAG."));
 258
 259   var = varobj_get_handle (argv[0]);
 260   if (var == NULL)
 261     error (_("Variable object not found"));
 262
 263   if (strcmp (argv[1], "0") == 0)
 264     frozen = 0;
 265   else if (strcmp (argv[1], "1") == 0)
 266     frozen = 1;
 267   else
 268     error (_("Invalid flag value"));
 269
 270   varobj_set_frozen (var, frozen);
 271
 272   /* We don't automatically return the new value, or what varobjs got new
 273      values during unfreezing.  If this information is required, client
 274      should call -var-update explicitly.  */
 275 }
 276
 277
 278 void
 279 mi_cmd_var_show_format (char *command, char **argv, int argc)
 280 {
 281   enum varobj_display_formats format;
 282   struct varobj *var;
 283
 284   if (argc != 1)
 285     error (_("mi_cmd_var_show_format: Usage: NAME."));
 286
 287   /* Get varobj handle, if a valid var obj name was specified */
 288   var = varobj_get_handle (argv[0]);
 289   if (var == NULL)
 290     error (_("mi_cmd_var_show_format: Variable object not found"));
 291
 292   format = varobj_get_display_format (var);
 293
 294   /* Report the current format */
 295   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 296 }
 297
 298 void
 299 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 300 {
 301   struct varobj *var;
 302
 303   if (argc != 1)
 304     error (_("mi_cmd_var_info_num_children: Usage: NAME."));
 305
 306   /* Get varobj handle, if a valid var obj name was specified */
 307   var = varobj_get_handle (argv[0]);
 308   if (var == NULL)
 309     error (_("mi_cmd_var_info_num_children: Variable object not found"));
 310
 311   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 312 }
 313
 314 /* Parse a string argument into a print_values value.  */
 315
 316 static enum print_values
 317 mi_parse_values_option (const char *arg)
 318 {
 319   if (strcmp (arg, "0") == 0
 320       || strcmp (arg, mi_no_values) == 0)
 321     return PRINT_NO_VALUES;
 322   else if (strcmp (arg, "1") == 0
 323            || strcmp (arg, mi_all_values) == 0)
 324     return PRINT_ALL_VALUES;
 325   else if (strcmp (arg, "2") == 0
 326            || strcmp (arg, mi_simple_values) == 0)
 327     return PRINT_SIMPLE_VALUES;
 328   else
 329     error (_("Unknown value for PRINT_VALUES\n\
 330 Must be: 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
 331            mi_no_values, mi_simple_values, mi_all_values);
 332 }
 333
 334 /* Return 1 if given the argument PRINT_VALUES we should display
 335    a value of type TYPE.  */
 336
 337 static int
 338 mi_print_value_p (struct type *type, enum print_values print_values)
 339 {
 340
 341   if (print_values == PRINT_NO_VALUES)
 342     return 0;
 343
 344   if (print_values == PRINT_ALL_VALUES)
 345     return 1;
 346
 347   if (type == NULL)
 348     return 1;
 349   else
 350     {
 351       type = check_typedef (type);
 352
 353       /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 354          and that type is not a compound type.  */
 355       return (TYPE_CODE (type) != TYPE_CODE_ARRAY
 356               && TYPE_CODE (type) != TYPE_CODE_STRUCT
 357               && TYPE_CODE (type) != TYPE_CODE_UNION);
 358     }
 359 }
 360
 361 void
 362 mi_cmd_var_list_children (char *command, char **argv, int argc)
 363 {
 364   struct varobj *var;
 365   VEC(varobj_p) *children;
 366   struct varobj *child;
 367   struct cleanup *cleanup_children;
 368   int numchild;
 369   enum print_values print_values;
 370   int ix;
 371
 372   if (argc != 1 && argc != 2)
 373     error (_("mi_cmd_var_list_children: Usage: [PRINT_VALUES] NAME"));
 374
 375   /* Get varobj handle, if a valid var obj name was specified */
 376   if (argc == 1)
 377     var = varobj_get_handle (argv[0]);
 378   else
 379     var = varobj_get_handle (argv[1]);
 380   if (var == NULL)
 381     error (_("Variable object not found"));
 382
 383   children = varobj_list_children (var);
 384   ui_out_field_int (uiout, "numchild", VEC_length (varobj_p, children));
 385   if (argc == 2)
 386     print_values = mi_parse_values_option (argv[0]);
 387   else
 388     print_values = PRINT_NO_VALUES;
 389
 390   if (VEC_length (varobj_p, children) == 0)
 391     return;
 392
 393   if (mi_version (uiout) == 1)
 394     cleanup_children = make_cleanup_ui_out_tuple_begin_end (uiout, "children");
 395   else
 396     cleanup_children = make_cleanup_ui_out_list_begin_end (uiout, "children");
 397   for (ix = 0; VEC_iterate (varobj_p, children, ix, child); ++ix)
 398     {
 399       struct cleanup *cleanup_child;
 400       cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
 401       print_varobj (child, print_values, 1 /* print expression */);
 402       do_cleanups (cleanup_child);
 403     }
 404   do_cleanups (cleanup_children);
 405 }
 406
 407 void
 408 mi_cmd_var_info_type (char *command, char **argv, int argc)
 409 {
 410   struct varobj *var;
 411
 412   if (argc != 1)
 413     error (_("mi_cmd_var_info_type: Usage: NAME."));
 414
 415   /* Get varobj handle, if a valid var obj name was specified */
 416   var = varobj_get_handle (argv[0]);
 417   if (var == NULL)
 418     error (_("mi_cmd_var_info_type: Variable object not found"));
 419
 420   ui_out_field_string (uiout, "type", varobj_get_type (var));
 421 }
 422
 423 void
 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
 442 void
 443 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 444 {
 445   enum varobj_languages lang;
 446   struct varobj *var;
 447
 448   if (argc != 1)
 449     error (_("mi_cmd_var_info_expression: Usage: NAME."));
 450
 451   /* Get varobj handle, if a valid var obj name was specified */
 452   var = varobj_get_handle (argv[0]);
 453   if (var == NULL)
 454     error (_("mi_cmd_var_info_expression: Variable object not found"));
 455
 456   lang = varobj_get_language (var);
 457
 458   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 459   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 460 }
 461
 462 void
 463 mi_cmd_var_show_attributes (char *command, char **argv, int argc)
 464 {
 465   int attr;
 466   char *attstr;
 467   struct varobj *var;
 468
 469   if (argc != 1)
 470     error (_("mi_cmd_var_show_attributes: Usage: NAME."));
 471
 472   /* Get varobj handle, if a valid var obj name was specified */
 473   var = varobj_get_handle (argv[0]);
 474   if (var == NULL)
 475     error (_("mi_cmd_var_show_attributes: Variable object not found"));
 476
 477   attr = varobj_get_attributes (var);
 478   /* FIXME: define masks for attributes */
 479   if (attr & 0x00000001)
 480     attstr = "editable";
 481   else
 482     attstr = "noneditable";
 483
 484   ui_out_field_string (uiout, "attr", attstr);
 485 }
 486
 487 void
 488 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 489 {
 490   struct varobj *var;
 491
 492   enum varobj_display_formats format;
 493   int formatFound;
 494   int optind;
 495   char *optarg;
 496
 497   enum opt
 498     {
 499       OP_FORMAT
 500     };
 501   static struct mi_opt opts[] =
 502   {
 503     {"f", OP_FORMAT, 1},
 504     { 0, 0, 0 }
 505   };
 506
 507   /* Parse arguments */
 508   format = FORMAT_NATURAL;
 509   formatFound = 0;
 510   optind = 0;
 511   while (1)
 512     {
 513       int opt = mi_getopt ("-var-evaluate-expression", argc, argv, opts, &optind, &optarg);
 514       if (opt < 0)
 515         break;
 516       switch ((enum opt) opt)
 517       {
 518         case OP_FORMAT:
 519           if (formatFound)
 520             error (_("Cannot specify format more than once"));
 521
 522           format = mi_parse_format (optarg);
 523           formatFound = 1;
 524           break;
 525       }
 526     }
 527
 528   if (optind >= argc)
 529     error (_("Usage: [-f FORMAT] NAME"));
 530
 531   if (optind < argc - 1)
 532     error (_("Garbage at end of command"));
 533
 534      /* Get varobj handle, if a valid var obj name was specified */
 535   var = varobj_get_handle (argv[optind]);
 536   if (var == NULL)
 537     error (_("Variable object not found"));
 538
 539   if (formatFound)
 540     ui_out_field_string (uiout, "value", varobj_get_formatted_value (var, format));
 541   else
 542     ui_out_field_string (uiout, "value", varobj_get_value (var));
 543 }
 544
 545 void
 546 mi_cmd_var_assign (char *command, char **argv, int argc)
 547 {
 548   struct varobj *var;
 549   char *expression;
 550
 551   if (argc != 2)
 552     error (_("mi_cmd_var_assign: Usage: NAME EXPRESSION."));
 553
 554   /* Get varobj handle, if a valid var obj name was specified */
 555   var = varobj_get_handle (argv[0]);
 556   if (var == NULL)
 557     error (_("mi_cmd_var_assign: Variable object not found"));
 558
 559   if (!varobj_editable_p (var))
 560     error (_("mi_cmd_var_assign: Variable object is not editable"));
 561
 562   expression = xstrdup (argv[1]);
 563
 564   if (!varobj_set_value (var, expression))
 565     error (_("mi_cmd_var_assign: Could not assign expression to variable object"));
 566
 567   ui_out_field_string (uiout, "value", varobj_get_value (var));
 568 }
 569
 570 void
 571 mi_cmd_var_update (char *command, char **argv, int argc)
 572 {
 573   struct varobj *var;
 574   struct varobj **rootlist;
 575   struct varobj **cr;
 576   struct cleanup *cleanup;
 577   char *name;
 578   int nv;
 579   enum print_values print_values;
 580
 581   if (argc != 1 && argc != 2)
 582     error (_("mi_cmd_var_update: Usage: [PRINT_VALUES] NAME."));
 583
 584   if (argc == 1)
 585     name = argv[0];
 586   else
 587     name = (argv[1]);
 588
 589   if (argc == 2)
 590     print_values = mi_parse_values_option (argv[0]);
 591   else
 592     print_values = PRINT_NO_VALUES;
 593
 594   /* Check if the parameter is a "*" which means that we want
 595      to update all variables */
 596
 597   if ((*name == '*' || *name == '@') && (*(name + 1) == '\0'))
 598     {
 599       nv = varobj_list (&rootlist);
 600       cleanup = make_cleanup (xfree, rootlist);
 601       if (mi_version (uiout) <= 1)
 602         make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 603       else
 604         make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 605       if (nv <= 0)
 606         {
 607           do_cleanups (cleanup);
 608           return;
 609         }
 610       cr = rootlist;
 611       while (*cr != NULL)
 612         {
 613           if (*name == '*' || varobj_floating_p (*cr))
 614             varobj_update_one (*cr, print_values, 0 /* implicit */);
 615           cr++;
 616         }
 617       do_cleanups (cleanup);
 618     }
 619   else
 620     {
 621       /* Get varobj handle, if a valid var obj name was specified */
 622       var = varobj_get_handle (name);
 623       if (var == NULL)
 624         error (_("mi_cmd_var_update: Variable object not found"));
 625
 626       if (mi_version (uiout) <= 1)
 627         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 628       else
 629         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 630       varobj_update_one (var, print_values, 1 /* explicit */);
 631       do_cleanups (cleanup);
 632     }
 633 }
 634
 635 /* Helper for mi_cmd_var_update().  */
 636
 637 static void
 638 varobj_update_one (struct varobj *var, enum print_values print_values,
 639                    int explicit)
 640 {
 641   struct varobj **cc;
 642   struct cleanup *cleanup = NULL;
 643   VEC (varobj_update_result) *changes;
 644   varobj_update_result *r;
 645   int i;
 646
 647   changes = varobj_update (&var, explicit);
 648
 649   for (i = 0; VEC_iterate (varobj_update_result, changes, i, r); ++i)
 650     {
 651       if (mi_version (uiout) > 1)
 652         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 653       ui_out_field_string (uiout, "name", varobj_get_objname (r->varobj));
 654
 655       switch (r->status)
 656         {
 657         case VAROBJ_IN_SCOPE:
 658           if (mi_print_value_p (varobj_get_gdb_type (r->varobj), print_values))
 659             ui_out_field_string (uiout, "value", varobj_get_value (r->varobj));
 660           ui_out_field_string (uiout, "in_scope", "true");
 661           break;
 662         case VAROBJ_NOT_IN_SCOPE:
 663           ui_out_field_string (uiout, "in_scope", "false");
 664           break;
 665         case VAROBJ_INVALID:
 666           ui_out_field_string (uiout, "in_scope", "invalid");
 667           break;
 668         }
 669
 670       if (r->status != VAROBJ_INVALID)
 671         {
 672           if (r->type_changed)
 673             ui_out_field_string (uiout, "type_changed", "true");
 674           else
 675             ui_out_field_string (uiout, "type_changed", "false");
 676         }
 677
 678       if (r->type_changed)
 679         {
 680           ui_out_field_string (uiout, "new_type", varobj_get_type (r->varobj));
 681           ui_out_field_int (uiout, "new_num_children",
 682                             varobj_get_num_children (r->varobj));
 683         }
 684
 685       if (mi_version (uiout) > 1)
 686         do_cleanups (cleanup);
 687     }
 688   VEC_free (varobj_update_result, changes);
 689 }