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   return MI_CMD_DONE;
 235 }
 236
 237 enum mi_cmd_result
 238 mi_cmd_var_set_frozen (char *command, char **argv, int argc)
 239 {
 240   struct varobj *var;
 241   int frozen;
 242
 243   if (argc != 2)
 244     error (_("-var-set-format: Usage: NAME FROZEN_FLAG."));
 245
 246   var = varobj_get_handle (argv[0]);
 247   if (var == NULL)
 248     error (_("Variable object not found"));
 249
 250   if (strcmp (argv[1], "0") == 0)
 251     frozen = 0;
 252   else if (strcmp (argv[1], "1") == 0)
 253     frozen = 1;
 254   else
 255     error (_("Invalid flag value"));
 256
 257   varobj_set_frozen (var, frozen);
 258
 259   /* We don't automatically return the new value, or what varobjs got new
 260      values during unfreezing.  If this information is required, client
 261      should call -var-update explicitly.  */
 262   return MI_CMD_DONE;
 263 }
 264
 265
 266 enum mi_cmd_result
 267 mi_cmd_var_show_format (char *command, char **argv, int argc)
 268 {
 269   enum varobj_display_formats format;
 270   struct varobj *var;
 271
 272   if (argc != 1)
 273     error (_("mi_cmd_var_show_format: Usage: NAME."));
 274
 275   /* Get varobj handle, if a valid var obj name was specified */
 276   var = varobj_get_handle (argv[0]);
 277   if (var == NULL)
 278     error (_("mi_cmd_var_show_format: Variable object not found"));
 279
 280   format = varobj_get_display_format (var);
 281
 282   /* Report the current format */
 283   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 284   return MI_CMD_DONE;
 285 }
 286
 287 enum mi_cmd_result
 288 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 289 {
 290   struct varobj *var;
 291
 292   if (argc != 1)
 293     error (_("mi_cmd_var_info_num_children: Usage: NAME."));
 294
 295   /* Get varobj handle, if a valid var obj name was specified */
 296   var = varobj_get_handle (argv[0]);
 297   if (var == NULL)
 298     error (_("mi_cmd_var_info_num_children: Variable object not found"));
 299
 300   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 301   return MI_CMD_DONE;
 302 }
 303
 304 /* Parse a string argument into a print_values value.  */
 305
 306 static enum print_values
 307 mi_parse_values_option (const char *arg)
 308 {
 309   if (strcmp (arg, "0") == 0
 310       || strcmp (arg, mi_no_values) == 0)
 311     return PRINT_NO_VALUES;
 312   else if (strcmp (arg, "1") == 0
 313            || strcmp (arg, mi_all_values) == 0)
 314     return PRINT_ALL_VALUES;
 315   else if (strcmp (arg, "2") == 0
 316            || strcmp (arg, mi_simple_values) == 0)
 317     return PRINT_SIMPLE_VALUES;
 318   else
 319     error (_("Unknown value for PRINT_VALUES\n\
 320 Must be: 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
 321            mi_no_values, mi_simple_values, mi_all_values);
 322 }
 323
 324 /* Return 1 if given the argument PRINT_VALUES we should display
 325    a value of type TYPE.  */
 326
 327 static int
 328 mi_print_value_p (struct type *type, enum print_values print_values)
 329 {
 330
 331   if (print_values == PRINT_NO_VALUES)
 332     return 0;
 333
 334   if (print_values == PRINT_ALL_VALUES)
 335     return 1;
 336
 337   if (type == NULL)
 338     return 1;
 339   else
 340     {
 341       type = check_typedef (type);
 342
 343       /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 344          and that type is not a compound type.  */
 345       return (TYPE_CODE (type) != TYPE_CODE_ARRAY
 346               && TYPE_CODE (type) != TYPE_CODE_STRUCT
 347               && TYPE_CODE (type) != TYPE_CODE_UNION);
 348     }
 349 }
 350
 351 enum mi_cmd_result
 352 mi_cmd_var_list_children (char *command, char **argv, int argc)
 353 {
 354   struct varobj *var;
 355   struct varobj **childlist;
 356   struct varobj **cc;
 357   struct cleanup *cleanup_children;
 358   int numchild;
 359   enum print_values print_values;
 360
 361   if (argc != 1 && argc != 2)
 362     error (_("mi_cmd_var_list_children: Usage: [PRINT_VALUES] NAME"));
 363
 364   /* Get varobj handle, if a valid var obj name was specified */
 365   if (argc == 1)
 366     var = varobj_get_handle (argv[0]);
 367   else
 368     var = varobj_get_handle (argv[1]);
 369   if (var == NULL)
 370     error (_("Variable object not found"));
 371
 372   numchild = varobj_list_children (var, &childlist);
 373   ui_out_field_int (uiout, "numchild", numchild);
 374   if (argc == 2)
 375     print_values = mi_parse_values_option (argv[0]);
 376   else
 377     print_values = PRINT_NO_VALUES;
 378
 379   if (numchild <= 0)
 380     {
 381       xfree (childlist);
 382       return MI_CMD_DONE;
 383     }
 384
 385   if (mi_version (uiout) == 1)
 386     cleanup_children = make_cleanup_ui_out_tuple_begin_end (uiout, "children");
 387   else
 388     cleanup_children = make_cleanup_ui_out_list_begin_end (uiout, "children");
 389   cc = childlist;
 390   while (*cc != NULL)
 391     {
 392       struct cleanup *cleanup_child;
 393       cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
 394       print_varobj (*cc, print_values, 1 /* print expression */);
 395       cc++;
 396       do_cleanups (cleanup_child);
 397     }
 398   do_cleanups (cleanup_children);
 399   xfree (childlist);
 400   return MI_CMD_DONE;
 401 }
 402
 403 enum mi_cmd_result
 404 mi_cmd_var_info_type (char *command, char **argv, int argc)
 405 {
 406   struct varobj *var;
 407
 408   if (argc != 1)
 409     error (_("mi_cmd_var_info_type: Usage: NAME."));
 410
 411   /* Get varobj handle, if a valid var obj name was specified */
 412   var = varobj_get_handle (argv[0]);
 413   if (var == NULL)
 414     error (_("mi_cmd_var_info_type: Variable object not found"));
 415
 416   ui_out_field_string (uiout, "type", varobj_get_type (var));
 417   return MI_CMD_DONE;
 418 }
 419
 420 enum mi_cmd_result
 421 mi_cmd_var_info_path_expression (char *command, char **argv, int argc)
 422 {
 423   struct varobj *var;
 424   char *path_expr;
 425
 426   if (argc != 1)
 427     error (_("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 (_("Variable object not found"));
 433
 434   path_expr = varobj_get_path_expr (var);
 435
 436   ui_out_field_string (uiout, "path_expr", path_expr);
 437
 438   return MI_CMD_DONE;
 439 }
 440
 441 enum mi_cmd_result
 442 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 443 {
 444   enum varobj_languages lang;
 445   struct varobj *var;
 446
 447   if (argc != 1)
 448     error (_("mi_cmd_var_info_expression: Usage: NAME."));
 449
 450   /* Get varobj handle, if a valid var obj name was specified */
 451   var = varobj_get_handle (argv[0]);
 452   if (var == NULL)
 453     error (_("mi_cmd_var_info_expression: Variable object not found"));
 454
 455   lang = varobj_get_language (var);
 456
 457   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 458   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 459   return MI_CMD_DONE;
 460 }
 461
 462 enum mi_cmd_result
 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   return MI_CMD_DONE;
 486 }
 487
 488 enum mi_cmd_result
 489 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 490 {
 491   struct varobj *var;
 492
 493   if (argc != 1)
 494     error (_("mi_cmd_var_evaluate_expression: Usage: NAME."));
 495
 496   /* Get varobj handle, if a valid var obj name was specified */
 497   var = varobj_get_handle (argv[0]);
 498   if (var == NULL)
 499     error (_("mi_cmd_var_evaluate_expression: Variable object not found"));
 500
 501   ui_out_field_string (uiout, "value", varobj_get_value (var));
 502   return MI_CMD_DONE;
 503 }
 504
 505 enum mi_cmd_result
 506 mi_cmd_var_assign (char *command, char **argv, int argc)
 507 {
 508   struct varobj *var;
 509   char *expression;
 510
 511   if (argc != 2)
 512     error (_("mi_cmd_var_assign: Usage: NAME EXPRESSION."));
 513
 514   /* Get varobj handle, if a valid var obj name was specified */
 515   var = varobj_get_handle (argv[0]);
 516   if (var == NULL)
 517     error (_("mi_cmd_var_assign: Variable object not found"));
 518
 519   if (!varobj_editable_p (var))
 520     error (_("mi_cmd_var_assign: Variable object is not editable"));
 521
 522   expression = xstrdup (argv[1]);
 523
 524   if (!varobj_set_value (var, expression))
 525     error (_("mi_cmd_var_assign: Could not assign expression to variable object"));
 526
 527   ui_out_field_string (uiout, "value", varobj_get_value (var));
 528   return MI_CMD_DONE;
 529 }
 530
 531 enum mi_cmd_result
 532 mi_cmd_var_update (char *command, char **argv, int argc)
 533 {
 534   struct varobj *var;
 535   struct varobj **rootlist;
 536   struct varobj **cr;
 537   struct cleanup *cleanup;
 538   char *name;
 539   int nv;
 540   enum print_values print_values;
 541
 542   if (argc != 1 && argc != 2)
 543     error (_("mi_cmd_var_update: Usage: [PRINT_VALUES] NAME."));
 544
 545   if (argc == 1)
 546     name = argv[0];
 547   else
 548     name = (argv[1]);
 549
 550   if (argc == 2)
 551     print_values = mi_parse_values_option (argv[0]);
 552   else
 553     print_values = PRINT_NO_VALUES;
 554
 555   /* Check if the parameter is a "*" which means that we want
 556      to update all variables */
 557
 558   if ((*name == '*') && (*(name + 1) == '\0'))
 559     {
 560       nv = varobj_list (&rootlist);
 561       cleanup = make_cleanup (xfree, rootlist);
 562       if (mi_version (uiout) <= 1)
 563         make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 564       else
 565         make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 566       if (nv <= 0)
 567         {
 568           do_cleanups (cleanup);
 569           return MI_CMD_DONE;
 570         }
 571       cr = rootlist;
 572       while (*cr != NULL)
 573         {
 574           varobj_update_one (*cr, print_values, 0 /* implicit */);
 575           cr++;
 576         }
 577       do_cleanups (cleanup);
 578     }
 579   else
 580     {
 581       /* Get varobj handle, if a valid var obj name was specified */
 582       var = varobj_get_handle (name);
 583       if (var == NULL)
 584         error (_("mi_cmd_var_update: Variable object not found"));
 585
 586       if (mi_version (uiout) <= 1)
 587         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 588       else
 589         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 590       varobj_update_one (var, print_values, 1 /* explicit */);
 591       do_cleanups (cleanup);
 592     }
 593     return MI_CMD_DONE;
 594 }
 595
 596 /* Helper for mi_cmd_var_update().  */
 597
 598 static void
 599 varobj_update_one (struct varobj *var, enum print_values print_values,
 600                    int explicit)
 601 {
 602   struct varobj **changelist;
 603   struct varobj **cc;
 604   struct cleanup *cleanup = NULL;
 605   int nc;
 606
 607   nc = varobj_update (&var, &changelist, explicit);
 608
 609   /* nc >= 0  represents the number of changes reported into changelist.
 610      nc < 0   means that an error occured or the the variable has
 611               changed type (TYPE_CHANGED).  */
 612
 613   if (nc == 0)
 614     return;
 615   else if (nc < 0)
 616     {
 617       if (mi_version (uiout) > 1)
 618         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 619       ui_out_field_string (uiout, "name", varobj_get_objname(var));
 620
 621       switch (nc)
 622       {
 623         case NOT_IN_SCOPE:
 624           ui_out_field_string (uiout, "in_scope", "false");
 625           break;
 626         case INVALID:
 627           ui_out_field_string (uiout, "in_scope", "invalid");
 628           break;
 629         case TYPE_CHANGED:
 630           ui_out_field_string (uiout, "in_scope", "true");
 631           ui_out_field_string (uiout, "new_type", varobj_get_type(var));
 632           ui_out_field_int (uiout, "new_num_children",
 633                             varobj_get_num_children(var));
 634           break;
 635       }
 636       if (mi_version (uiout) > 1)
 637         do_cleanups (cleanup);
 638     }
 639   else
 640     {
 641       cc = changelist;
 642       while (*cc != NULL)
 643         {
 644           if (mi_version (uiout) > 1)
 645             cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 646           ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 647           if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
 648             ui_out_field_string (uiout, "value", varobj_get_value (*cc));
 649           ui_out_field_string (uiout, "in_scope", "true");
 650           ui_out_field_string (uiout, "type_changed", "false");
 651           if (mi_version (uiout) > 1)
 652             do_cleanups (cleanup);
 653           cc++;
 654         }
 655       xfree (changelist);
 656     }
 657 }