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 3 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, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "mi-cmds.h"
  24 #include "ui-out.h"
  25 #include "mi-out.h"
  26 #include "varobj.h"
  27 #include "value.h"
  28 #include <ctype.h>
  29 #include "gdb_string.h"
  30
  31 const char mi_no_values[] = "--no-values";
  32 const char mi_simple_values[] = "--simple-values";
  33 const char mi_all_values[] = "--all-values";
  34
  35 extern int varobjdebug;         /* defined in varobj.c.  */
  36
  37 static void varobj_update_one (struct varobj *var,
  38                               enum print_values print_values,
  39                               int explicit);
  40
  41 static int mi_print_value_p (struct type *type, enum print_values print_values);
  42
  43 /* Print variable object VAR.  The PRINT_VALUES parameter controls
  44    if the value should be printed.  The PRINT_EXPRESSION parameter
  45    controls if the expression should be printed.  */
  46 static void
  47 print_varobj (struct varobj *var, enum print_values print_values,
  48               int print_expression)
  49 {
  50   struct type *gdb_type;
  51   char *type;
  52
  53   ui_out_field_string (uiout, "name", varobj_get_objname (var));
  54   if (print_expression)
  55     ui_out_field_string (uiout, "exp", varobj_get_expression (var));
  56   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
  57
  58   if (mi_print_value_p (varobj_get_gdb_type (var), print_values))
  59     ui_out_field_string (uiout, "value", varobj_get_value (var));
  60
  61   type = varobj_get_type (var);
  62   if (type != NULL)
  63     {
  64       ui_out_field_string (uiout, "type", type);
  65       xfree (type);
  66     }
  67
  68   if (varobj_get_frozen (var))
  69     ui_out_field_int (uiout, "frozen", 1);
  70 }
  71
  72 /* VAROBJ operations */
  73
  74 enum mi_cmd_result
  75 mi_cmd_var_create (char *command, char **argv, int argc)
  76 {
  77   CORE_ADDR frameaddr = 0;
  78   struct varobj *var;
  79   char *name;
  80   char *frame;
  81   char *expr;
  82   struct cleanup *old_cleanups;
  83   enum varobj_type var_type;
  84
  85   if (argc != 3)
  86     {
  87       /* mi_error_message = xstrprintf ("mi_cmd_var_create: Usage:
  88          ...."); return MI_CMD_ERROR; */
  89       error (_("mi_cmd_var_create: Usage: NAME FRAME EXPRESSION."));
  90     }
  91
  92   name = xstrdup (argv[0]);
  93   /* Add cleanup for name. Must be free_current_contents as
  94      name can be reallocated */
  95   old_cleanups = make_cleanup (free_current_contents, &name);
  96
  97   frame = xstrdup (argv[1]);
  98   make_cleanup (xfree, frame);
  99
 100   expr = xstrdup (argv[2]);
 101   make_cleanup (xfree, expr);
 102
 103   if (strcmp (name, "-") == 0)
 104     {
 105       xfree (name);
 106       name = varobj_gen_name ();
 107     }
 108   else if (!isalpha (*name))
 109     error (_("mi_cmd_var_create: name of object must begin with a letter"));
 110
 111   if (strcmp (frame, "*") == 0)
 112     var_type = USE_CURRENT_FRAME;
 113   else if (strcmp (frame, "@") == 0)
 114     var_type = USE_SELECTED_FRAME;
 115   else
 116     {
 117       var_type = USE_SPECIFIED_FRAME;
 118       frameaddr = string_to_core_addr (frame);
 119     }
 120
 121   if (varobjdebug)
 122     fprintf_unfiltered (gdb_stdlog,
 123                     "Name=\"%s\", Frame=\"%s\" (0x%s), Expression=\"%s\"\n",
 124                         name, frame, paddr (frameaddr), expr);
 125
 126   var = varobj_create (name, expr, frameaddr, var_type);
 127
 128   if (var == NULL)
 129     error (_("mi_cmd_var_create: unable to create variable object"));
 130
 131   print_varobj (var, PRINT_ALL_VALUES, 0 /* don't print expression */);
 132
 133   do_cleanups (old_cleanups);
 134   return MI_CMD_DONE;
 135 }
 136
 137 enum mi_cmd_result
 138 mi_cmd_var_delete (char *command, char **argv, int argc)
 139 {
 140   char *name;
 141   struct varobj *var;
 142   int numdel;
 143   int children_only_p = 0;
 144   struct cleanup *old_cleanups;
 145
 146   if (argc < 1 || argc > 2)
 147     error (_("mi_cmd_var_delete: Usage: [-c] EXPRESSION."));
 148
 149   name = xstrdup (argv[0]);
 150   /* Add cleanup for name. Must be free_current_contents as
 151      name can be reallocated */
 152   old_cleanups = make_cleanup (free_current_contents, &name);
 153
 154   /* If we have one single argument it cannot be '-c' or any string
 155      starting with '-'. */
 156   if (argc == 1)
 157     {
 158       if (strcmp (name, "-c") == 0)
 159         error (_("mi_cmd_var_delete: Missing required argument after '-c': variable object name"));
 160       if (*name == '-')
 161         error (_("mi_cmd_var_delete: Illegal variable object name"));
 162     }
 163
 164   /* If we have 2 arguments they must be '-c' followed by a string
 165      which would be the variable name. */
 166   if (argc == 2)
 167     {
 168       if (strcmp (name, "-c") != 0)
 169         error (_("mi_cmd_var_delete: Invalid option."));
 170       children_only_p = 1;
 171       do_cleanups (old_cleanups);
 172       name = xstrdup (argv[1]);
 173       make_cleanup (free_current_contents, &name);
 174     }
 175
 176   /* If we didn't error out, now NAME contains the name of the
 177      variable. */
 178
 179   var = varobj_get_handle (name);
 180
 181   if (var == NULL)
 182     error (_("mi_cmd_var_delete: Variable object not found."));
 183
 184   numdel = varobj_delete (var, NULL, children_only_p);
 185
 186   ui_out_field_int (uiout, "ndeleted", numdel);
 187
 188   do_cleanups (old_cleanups);
 189   return MI_CMD_DONE;
 190 }
 191
 192 enum mi_cmd_result
 193 mi_cmd_var_set_format (char *command, char **argv, int argc)
 194 {
 195   enum varobj_display_formats format;
 196   int len;
 197   struct varobj *var;
 198   char *formspec;
 199
 200   if (argc != 2)
 201     error (_("mi_cmd_var_set_format: Usage: NAME FORMAT."));
 202
 203   /* Get varobj handle, if a valid var obj name was specified */
 204   var = varobj_get_handle (argv[0]);
 205
 206   if (var == NULL)
 207     error (_("mi_cmd_var_set_format: Variable object not found"));
 208
 209   formspec = argv[1];
 210   if (formspec == NULL)
 211     error (_("mi_cmd_var_set_format: Must specify the format as: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 212
 213   len = strlen (formspec);
 214
 215   if (strncmp (formspec, "natural", len) == 0)
 216     format = FORMAT_NATURAL;
 217   else if (strncmp (formspec, "binary", len) == 0)
 218     format = FORMAT_BINARY;
 219   else if (strncmp (formspec, "decimal", len) == 0)
 220     format = FORMAT_DECIMAL;
 221   else if (strncmp (formspec, "hexadecimal", len) == 0)
 222     format = FORMAT_HEXADECIMAL;
 223   else if (strncmp (formspec, "octal", len) == 0)
 224     format = FORMAT_OCTAL;
 225   else
 226     error (_("mi_cmd_var_set_format: Unknown display format: must be: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 227
 228   /* Set the format of VAR to given format */
 229   varobj_set_display_format (var, format);
 230
 231   /* Report the new current format */
 232   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 233   return MI_CMD_DONE;
 234 }
 235
 236 enum mi_cmd_result
 237 mi_cmd_var_set_frozen (char *command, char **argv, int argc)
 238 {
 239   struct varobj *var;
 240   int frozen;
 241
 242   if (argc != 2)
 243     error (_("-var-set-format: Usage: NAME FROZEN_FLAG."));
 244
 245   var = varobj_get_handle (argv[0]);
 246   if (var == NULL)
 247     error (_("Variable object not found"));
 248
 249   if (strcmp (argv[1], "0") == 0)
 250     frozen = 0;
 251   else if (strcmp (argv[1], "1") == 0)
 252     frozen = 1;
 253   else
 254     error (_("Invalid flag value"));
 255
 256   varobj_set_frozen (var, frozen);
 257
 258   /* We don't automatically return the new value, or what varobjs got new
 259      values during unfreezing.  If this information is required, client
 260      should call -var-update explicitly.  */
 261   return MI_CMD_DONE;
 262 }
 263
 264
 265 enum mi_cmd_result
 266 mi_cmd_var_show_format (char *command, char **argv, int argc)
 267 {
 268   enum varobj_display_formats format;
 269   struct varobj *var;
 270
 271   if (argc != 1)
 272     error (_("mi_cmd_var_show_format: Usage: NAME."));
 273
 274   /* Get varobj handle, if a valid var obj name was specified */
 275   var = varobj_get_handle (argv[0]);
 276   if (var == NULL)
 277     error (_("mi_cmd_var_show_format: Variable object not found"));
 278
 279   format = varobj_get_display_format (var);
 280
 281   /* Report the current format */
 282   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 283   return MI_CMD_DONE;
 284 }
 285
 286 enum mi_cmd_result
 287 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 288 {
 289   struct varobj *var;
 290
 291   if (argc != 1)
 292     error (_("mi_cmd_var_info_num_children: Usage: NAME."));
 293
 294   /* Get varobj handle, if a valid var obj name was specified */
 295   var = varobj_get_handle (argv[0]);
 296   if (var == NULL)
 297     error (_("mi_cmd_var_info_num_children: Variable object not found"));
 298
 299   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 300   return MI_CMD_DONE;
 301 }
 302
 303 /* Parse a string argument into a print_values value.  */
 304
 305 static enum print_values
 306 mi_parse_values_option (const char *arg)
 307 {
 308   if (strcmp (arg, "0") == 0
 309       || strcmp (arg, mi_no_values) == 0)
 310     return PRINT_NO_VALUES;
 311   else if (strcmp (arg, "1") == 0
 312            || strcmp (arg, mi_all_values) == 0)
 313     return PRINT_ALL_VALUES;
 314   else if (strcmp (arg, "2") == 0
 315            || strcmp (arg, mi_simple_values) == 0)
 316     return PRINT_SIMPLE_VALUES;
 317   else
 318     error (_("Unknown value for PRINT_VALUES\n\
 319 Must be: 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
 320            mi_no_values, mi_simple_values, mi_all_values);
 321 }
 322
 323 /* Return 1 if given the argument PRINT_VALUES we should display
 324    a value of type TYPE.  */
 325
 326 static int
 327 mi_print_value_p (struct type *type, enum print_values print_values)
 328 {
 329
 330   if (print_values == PRINT_NO_VALUES)
 331     return 0;
 332
 333   if (print_values == PRINT_ALL_VALUES)
 334     return 1;
 335
 336   if (type == NULL)
 337     return 1;
 338   else
 339     {
 340       type = check_typedef (type);
 341
 342       /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 343          and that type is not a compound type.  */
 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
 350 enum mi_cmd_result
 351 mi_cmd_var_list_children (char *command, char **argv, int argc)
 352 {
 353   struct varobj *var;
 354   struct varobj **childlist;
 355   struct varobj **cc;
 356   struct cleanup *cleanup_children;
 357   int numchild;
 358   enum print_values print_values;
 359
 360   if (argc != 1 && argc != 2)
 361     error (_("mi_cmd_var_list_children: Usage: [PRINT_VALUES] NAME"));
 362
 363   /* Get varobj handle, if a valid var obj name was specified */
 364   if (argc == 1)
 365     var = varobj_get_handle (argv[0]);
 366   else
 367     var = varobj_get_handle (argv[1]);
 368   if (var == NULL)
 369     error (_("Variable object not found"));
 370
 371   numchild = varobj_list_children (var, &childlist);
 372   ui_out_field_int (uiout, "numchild", numchild);
 373   if (argc == 2)
 374     print_values = mi_parse_values_option (argv[0]);
 375   else
 376     print_values = PRINT_NO_VALUES;
 377
 378   if (numchild <= 0)
 379     {
 380       xfree (childlist);
 381       return MI_CMD_DONE;
 382     }
 383
 384   if (mi_version (uiout) == 1)
 385     cleanup_children = make_cleanup_ui_out_tuple_begin_end (uiout, "children");
 386   else
 387     cleanup_children = make_cleanup_ui_out_list_begin_end (uiout, "children");
 388   cc = childlist;
 389   while (*cc != NULL)
 390     {
 391       struct cleanup *cleanup_child;
 392       cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
 393       print_varobj (*cc, print_values, 1 /* print expression */);
 394       cc++;
 395       do_cleanups (cleanup_child);
 396     }
 397   do_cleanups (cleanup_children);
 398   xfree (childlist);
 399   return MI_CMD_DONE;
 400 }
 401
 402 enum mi_cmd_result
 403 mi_cmd_var_info_type (char *command, char **argv, int argc)
 404 {
 405   struct varobj *var;
 406
 407   if (argc != 1)
 408     error (_("mi_cmd_var_info_type: Usage: NAME."));
 409
 410   /* Get varobj handle, if a valid var obj name was specified */
 411   var = varobj_get_handle (argv[0]);
 412   if (var == NULL)
 413     error (_("mi_cmd_var_info_type: Variable object not found"));
 414
 415   ui_out_field_string (uiout, "type", varobj_get_type (var));
 416   return MI_CMD_DONE;
 417 }
 418
 419 enum mi_cmd_result
 420 mi_cmd_var_info_path_expression (char *command, char **argv, int argc)
 421 {
 422   struct varobj *var;
 423   char *path_expr;
 424
 425   if (argc != 1)
 426     error (_("Usage: NAME."));
 427
 428   /* Get varobj handle, if a valid var obj name was specified.  */
 429   var = varobj_get_handle (argv[0]);
 430   if (var == NULL)
 431     error (_("Variable object not found"));
 432
 433   path_expr = varobj_get_path_expr (var);
 434
 435   ui_out_field_string (uiout, "path_expr", path_expr);
 436
 437   return MI_CMD_DONE;
 438 }
 439
 440 enum mi_cmd_result
 441 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 442 {
 443   enum varobj_languages lang;
 444   struct varobj *var;
 445
 446   if (argc != 1)
 447     error (_("mi_cmd_var_info_expression: Usage: NAME."));
 448
 449   /* Get varobj handle, if a valid var obj name was specified */
 450   var = varobj_get_handle (argv[0]);
 451   if (var == NULL)
 452     error (_("mi_cmd_var_info_expression: Variable object not found"));
 453
 454   lang = varobj_get_language (var);
 455
 456   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 457   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 458   return MI_CMD_DONE;
 459 }
 460
 461 enum mi_cmd_result
 462 mi_cmd_var_show_attributes (char *command, char **argv, int argc)
 463 {
 464   int attr;
 465   char *attstr;
 466   struct varobj *var;
 467
 468   if (argc != 1)
 469     error (_("mi_cmd_var_show_attributes: Usage: NAME."));
 470
 471   /* Get varobj handle, if a valid var obj name was specified */
 472   var = varobj_get_handle (argv[0]);
 473   if (var == NULL)
 474     error (_("mi_cmd_var_show_attributes: Variable object not found"));
 475
 476   attr = varobj_get_attributes (var);
 477   /* FIXME: define masks for attributes */
 478   if (attr & 0x00000001)
 479     attstr = "editable";
 480   else
 481     attstr = "noneditable";
 482
 483   ui_out_field_string (uiout, "attr", attstr);
 484   return MI_CMD_DONE;
 485 }
 486
 487 enum mi_cmd_result
 488 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 489 {
 490   struct varobj *var;
 491
 492   if (argc != 1)
 493     error (_("mi_cmd_var_evaluate_expression: Usage: NAME."));
 494
 495   /* Get varobj handle, if a valid var obj name was specified */
 496   var = varobj_get_handle (argv[0]);
 497   if (var == NULL)
 498     error (_("mi_cmd_var_evaluate_expression: Variable object not found"));
 499
 500   ui_out_field_string (uiout, "value", varobj_get_value (var));
 501   return MI_CMD_DONE;
 502 }
 503
 504 enum mi_cmd_result
 505 mi_cmd_var_assign (char *command, char **argv, int argc)
 506 {
 507   struct varobj *var;
 508   char *expression;
 509
 510   if (argc != 2)
 511     error (_("mi_cmd_var_assign: Usage: NAME EXPRESSION."));
 512
 513   /* Get varobj handle, if a valid var obj name was specified */
 514   var = varobj_get_handle (argv[0]);
 515   if (var == NULL)
 516     error (_("mi_cmd_var_assign: Variable object not found"));
 517
 518   if (!varobj_editable_p (var))
 519     error (_("mi_cmd_var_assign: Variable object is not editable"));
 520
 521   expression = xstrdup (argv[1]);
 522
 523   if (!varobj_set_value (var, expression))
 524     error (_("mi_cmd_var_assign: Could not assign expression to variable object"));
 525
 526   ui_out_field_string (uiout, "value", varobj_get_value (var));
 527   return MI_CMD_DONE;
 528 }
 529
 530 enum mi_cmd_result
 531 mi_cmd_var_update (char *command, char **argv, int argc)
 532 {
 533   struct varobj *var;
 534   struct varobj **rootlist;
 535   struct varobj **cr;
 536   struct cleanup *cleanup;
 537   char *name;
 538   int nv;
 539   enum print_values print_values;
 540
 541   if (argc != 1 && argc != 2)
 542     error (_("mi_cmd_var_update: Usage: [PRINT_VALUES] NAME."));
 543
 544   if (argc == 1)
 545     name = argv[0];
 546   else
 547     name = (argv[1]);
 548
 549   if (argc == 2)
 550     print_values = mi_parse_values_option (argv[0]);
 551   else
 552     print_values = PRINT_NO_VALUES;
 553
 554   /* Check if the parameter is a "*" which means that we want
 555      to update all variables */
 556
 557   if ((*name == '*') && (*(name + 1) == '\0'))
 558     {
 559       nv = varobj_list (&rootlist);
 560       cleanup = make_cleanup (xfree, rootlist);
 561       if (mi_version (uiout) <= 1)
 562         make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 563       else
 564         make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 565       if (nv <= 0)
 566         {
 567           do_cleanups (cleanup);
 568           return MI_CMD_DONE;
 569         }
 570       cr = rootlist;
 571       while (*cr != NULL)
 572         {
 573           varobj_update_one (*cr, print_values, 0 /* implicit */);
 574           cr++;
 575         }
 576       do_cleanups (cleanup);
 577     }
 578   else
 579     {
 580       /* Get varobj handle, if a valid var obj name was specified */
 581       var = varobj_get_handle (name);
 582       if (var == NULL)
 583         error (_("mi_cmd_var_update: Variable object not found"));
 584
 585       if (mi_version (uiout) <= 1)
 586         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 587       else
 588         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 589       varobj_update_one (var, print_values, 1 /* explicit */);
 590       do_cleanups (cleanup);
 591     }
 592     return MI_CMD_DONE;
 593 }
 594
 595 /* Helper for mi_cmd_var_update().  */
 596
 597 static void
 598 varobj_update_one (struct varobj *var, enum print_values print_values,
 599                    int explicit)
 600 {
 601   struct varobj **changelist;
 602   struct varobj **cc;
 603   struct cleanup *cleanup = NULL;
 604   int nc;
 605
 606   nc = varobj_update (&var, &changelist, explicit);
 607
 608   /* nc >= 0  represents the number of changes reported into changelist.
 609      nc < 0   means that an error occured or the the variable has
 610               changed type (TYPE_CHANGED).  */
 611
 612   if (nc == 0)
 613     return;
 614   else if (nc < 0)
 615     {
 616       if (mi_version (uiout) > 1)
 617         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 618       ui_out_field_string (uiout, "name", varobj_get_objname(var));
 619
 620       switch (nc)
 621       {
 622         case NOT_IN_SCOPE:
 623           ui_out_field_string (uiout, "in_scope", "false");
 624           break;
 625         case INVALID:
 626           ui_out_field_string (uiout, "in_scope", "invalid");
 627           break;
 628         case TYPE_CHANGED:
 629           ui_out_field_string (uiout, "in_scope", "true");
 630           ui_out_field_string (uiout, "new_type", varobj_get_type(var));
 631           ui_out_field_int (uiout, "new_num_children",
 632                             varobj_get_num_children(var));
 633           break;
 634       }
 635       if (mi_version (uiout) > 1)
 636         do_cleanups (cleanup);
 637     }
 638   else
 639     {
 640       cc = changelist;
 641       while (*cc != NULL)
 642         {
 643           if (mi_version (uiout) > 1)
 644             cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 645           ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 646           if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
 647             ui_out_field_string (uiout, "value", varobj_get_value (*cc));
 648           ui_out_field_string (uiout, "in_scope", "true");
 649           ui_out_field_string (uiout, "type_changed", "false");
 650           if (mi_version (uiout) > 1)
 651             do_cleanups (cleanup);
 652           cc++;
 653         }
 654       xfree (changelist);
 655     }
 656 }