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   char *type;
  51
  52   ui_out_field_string (uiout, "name", varobj_get_objname (var));
  53   if (print_expression)
  54     ui_out_field_string (uiout, "exp", varobj_get_expression (var));
  55   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
  56
  57   if (mi_print_value_p (varobj_get_gdb_type (var), print_values))
  58     ui_out_field_string (uiout, "value", varobj_get_value (var));
  59
  60   type = varobj_get_type (var);
  61   if (type != NULL)
  62     {
  63       ui_out_field_string (uiout, "type", type);
  64       xfree (type);
  65     }
  66
  67   if (varobj_get_frozen (var))
  68     ui_out_field_int (uiout, "frozen", 1);
  69 }
  70
  71 /* VAROBJ operations */
  72
  73 enum mi_cmd_result
  74 mi_cmd_var_create (char *command, char **argv, int argc)
  75 {
  76   CORE_ADDR frameaddr = 0;
  77   struct varobj *var;
  78   char *name;
  79   char *frame;
  80   char *expr;
  81   struct cleanup *old_cleanups;
  82   enum varobj_type var_type;
  83
  84   if (argc != 3)
  85     {
  86       /* mi_error_message = xstrprintf ("mi_cmd_var_create: Usage:
  87          ...."); return MI_CMD_ERROR; */
  88       error (_("mi_cmd_var_create: Usage: NAME FRAME EXPRESSION."));
  89     }
  90
  91   name = xstrdup (argv[0]);
  92   /* Add cleanup for name. Must be free_current_contents as
  93      name can be reallocated */
  94   old_cleanups = make_cleanup (free_current_contents, &name);
  95
  96   frame = xstrdup (argv[1]);
  97   make_cleanup (xfree, frame);
  98
  99   expr = xstrdup (argv[2]);
 100   make_cleanup (xfree, expr);
 101
 102   if (strcmp (name, "-") == 0)
 103     {
 104       xfree (name);
 105       name = varobj_gen_name ();
 106     }
 107   else if (!isalpha (*name))
 108     error (_("mi_cmd_var_create: name of object must begin with a letter"));
 109
 110   if (strcmp (frame, "*") == 0)
 111     var_type = USE_CURRENT_FRAME;
 112   else if (strcmp (frame, "@") == 0)
 113     var_type = USE_SELECTED_FRAME;
 114   else
 115     {
 116       var_type = USE_SPECIFIED_FRAME;
 117       frameaddr = string_to_core_addr (frame);
 118     }
 119
 120   if (varobjdebug)
 121     fprintf_unfiltered (gdb_stdlog,
 122                     "Name=\"%s\", Frame=\"%s\" (0x%s), Expression=\"%s\"\n",
 123                         name, frame, paddr (frameaddr), expr);
 124
 125   var = varobj_create (name, expr, frameaddr, var_type);
 126
 127   if (var == NULL)
 128     error (_("mi_cmd_var_create: unable to create variable object"));
 129
 130   print_varobj (var, PRINT_ALL_VALUES, 0 /* don't print expression */);
 131
 132   do_cleanups (old_cleanups);
 133   return MI_CMD_DONE;
 134 }
 135
 136 enum mi_cmd_result
 137 mi_cmd_var_delete (char *command, char **argv, int argc)
 138 {
 139   char *name;
 140   struct varobj *var;
 141   int numdel;
 142   int children_only_p = 0;
 143   struct cleanup *old_cleanups;
 144
 145   if (argc < 1 || argc > 2)
 146     error (_("mi_cmd_var_delete: Usage: [-c] EXPRESSION."));
 147
 148   name = xstrdup (argv[0]);
 149   /* Add cleanup for name. Must be free_current_contents as
 150      name can be reallocated */
 151   old_cleanups = make_cleanup (free_current_contents, &name);
 152
 153   /* If we have one single argument it cannot be '-c' or any string
 154      starting with '-'. */
 155   if (argc == 1)
 156     {
 157       if (strcmp (name, "-c") == 0)
 158         error (_("mi_cmd_var_delete: Missing required argument after '-c': variable object name"));
 159       if (*name == '-')
 160         error (_("mi_cmd_var_delete: Illegal variable object name"));
 161     }
 162
 163   /* If we have 2 arguments they must be '-c' followed by a string
 164      which would be the variable name. */
 165   if (argc == 2)
 166     {
 167       if (strcmp (name, "-c") != 0)
 168         error (_("mi_cmd_var_delete: Invalid option."));
 169       children_only_p = 1;
 170       do_cleanups (old_cleanups);
 171       name = xstrdup (argv[1]);
 172       make_cleanup (free_current_contents, &name);
 173     }
 174
 175   /* If we didn't error out, now NAME contains the name of the
 176      variable. */
 177
 178   var = varobj_get_handle (name);
 179
 180   if (var == NULL)
 181     error (_("mi_cmd_var_delete: Variable object not found."));
 182
 183   numdel = varobj_delete (var, NULL, children_only_p);
 184
 185   ui_out_field_int (uiout, "ndeleted", numdel);
 186
 187   do_cleanups (old_cleanups);
 188   return MI_CMD_DONE;
 189 }
 190
 191 enum mi_cmd_result
 192 mi_cmd_var_set_format (char *command, char **argv, int argc)
 193 {
 194   enum varobj_display_formats format;
 195   int len;
 196   struct varobj *var;
 197   char *formspec;
 198
 199   if (argc != 2)
 200     error (_("mi_cmd_var_set_format: Usage: NAME FORMAT."));
 201
 202   /* Get varobj handle, if a valid var obj name was specified */
 203   var = varobj_get_handle (argv[0]);
 204
 205   if (var == NULL)
 206     error (_("mi_cmd_var_set_format: Variable object not found"));
 207
 208   formspec = argv[1];
 209   if (formspec == NULL)
 210     error (_("mi_cmd_var_set_format: Must specify the format as: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 211
 212   len = strlen (formspec);
 213
 214   if (strncmp (formspec, "natural", len) == 0)
 215     format = FORMAT_NATURAL;
 216   else if (strncmp (formspec, "binary", len) == 0)
 217     format = FORMAT_BINARY;
 218   else if (strncmp (formspec, "decimal", len) == 0)
 219     format = FORMAT_DECIMAL;
 220   else if (strncmp (formspec, "hexadecimal", len) == 0)
 221     format = FORMAT_HEXADECIMAL;
 222   else if (strncmp (formspec, "octal", len) == 0)
 223     format = FORMAT_OCTAL;
 224   else
 225     error (_("mi_cmd_var_set_format: Unknown display format: must be: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 226
 227   /* Set the format of VAR to given format */
 228   varobj_set_display_format (var, format);
 229
 230   /* Report the new current format */
 231   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 232   return MI_CMD_DONE;
 233 }
 234
 235 enum mi_cmd_result
 236 mi_cmd_var_set_frozen (char *command, char **argv, int argc)
 237 {
 238   struct varobj *var;
 239   int frozen;
 240
 241   if (argc != 2)
 242     error (_("-var-set-format: Usage: NAME FROZEN_FLAG."));
 243
 244   var = varobj_get_handle (argv[0]);
 245   if (var == NULL)
 246     error (_("Variable object not found"));
 247
 248   if (strcmp (argv[1], "0") == 0)
 249     frozen = 0;
 250   else if (strcmp (argv[1], "1") == 0)
 251     frozen = 1;
 252   else
 253     error (_("Invalid flag value"));
 254
 255   varobj_set_frozen (var, frozen);
 256
 257   /* We don't automatically return the new value, or what varobjs got new
 258      values during unfreezing.  If this information is required, client
 259      should call -var-update explicitly.  */
 260   return MI_CMD_DONE;
 261 }
 262
 263
 264 enum mi_cmd_result
 265 mi_cmd_var_show_format (char *command, char **argv, int argc)
 266 {
 267   enum varobj_display_formats format;
 268   struct varobj *var;
 269
 270   if (argc != 1)
 271     error (_("mi_cmd_var_show_format: Usage: NAME."));
 272
 273   /* Get varobj handle, if a valid var obj name was specified */
 274   var = varobj_get_handle (argv[0]);
 275   if (var == NULL)
 276     error (_("mi_cmd_var_show_format: Variable object not found"));
 277
 278   format = varobj_get_display_format (var);
 279
 280   /* Report the current format */
 281   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 282   return MI_CMD_DONE;
 283 }
 284
 285 enum mi_cmd_result
 286 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 287 {
 288   struct varobj *var;
 289
 290   if (argc != 1)
 291     error (_("mi_cmd_var_info_num_children: Usage: NAME."));
 292
 293   /* Get varobj handle, if a valid var obj name was specified */
 294   var = varobj_get_handle (argv[0]);
 295   if (var == NULL)
 296     error (_("mi_cmd_var_info_num_children: Variable object not found"));
 297
 298   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 299   return MI_CMD_DONE;
 300 }
 301
 302 /* Parse a string argument into a print_values value.  */
 303
 304 static enum print_values
 305 mi_parse_values_option (const char *arg)
 306 {
 307   if (strcmp (arg, "0") == 0
 308       || strcmp (arg, mi_no_values) == 0)
 309     return PRINT_NO_VALUES;
 310   else if (strcmp (arg, "1") == 0
 311            || strcmp (arg, mi_all_values) == 0)
 312     return PRINT_ALL_VALUES;
 313   else if (strcmp (arg, "2") == 0
 314            || strcmp (arg, mi_simple_values) == 0)
 315     return PRINT_SIMPLE_VALUES;
 316   else
 317     error (_("Unknown value for PRINT_VALUES\n\
 318 Must be: 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
 319            mi_no_values, mi_simple_values, mi_all_values);
 320 }
 321
 322 /* Return 1 if given the argument PRINT_VALUES we should display
 323    a value of type TYPE.  */
 324
 325 static int
 326 mi_print_value_p (struct type *type, enum print_values print_values)
 327 {
 328   type = check_typedef (type);
 329
 330   if (print_values == PRINT_NO_VALUES)
 331     return 0;
 332
 333   if (print_values == PRINT_ALL_VALUES)
 334     return 1;
 335
 336   /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 337      and that type is not a compound type.  */
 338
 339   return (TYPE_CODE (type) != TYPE_CODE_ARRAY
 340           && TYPE_CODE (type) != TYPE_CODE_STRUCT
 341           && TYPE_CODE (type) != TYPE_CODE_UNION);
 342 }
 343
 344 enum mi_cmd_result
 345 mi_cmd_var_list_children (char *command, char **argv, int argc)
 346 {
 347   struct varobj *var;
 348   struct varobj **childlist;
 349   struct varobj **cc;
 350   struct cleanup *cleanup_children;
 351   int numchild;
 352   enum print_values print_values;
 353
 354   if (argc != 1 && argc != 2)
 355     error (_("mi_cmd_var_list_children: Usage: [PRINT_VALUES] NAME"));
 356
 357   /* Get varobj handle, if a valid var obj name was specified */
 358   if (argc == 1)
 359     var = varobj_get_handle (argv[0]);
 360   else
 361     var = varobj_get_handle (argv[1]);
 362   if (var == NULL)
 363     error (_("Variable object not found"));
 364
 365   numchild = varobj_list_children (var, &childlist);
 366   ui_out_field_int (uiout, "numchild", numchild);
 367   if (argc == 2)
 368     print_values = mi_parse_values_option (argv[0]);
 369   else
 370     print_values = PRINT_NO_VALUES;
 371
 372   if (numchild <= 0)
 373     {
 374       xfree (childlist);
 375       return MI_CMD_DONE;
 376     }
 377
 378   if (mi_version (uiout) == 1)
 379     cleanup_children = make_cleanup_ui_out_tuple_begin_end (uiout, "children");
 380   else
 381     cleanup_children = make_cleanup_ui_out_list_begin_end (uiout, "children");
 382   cc = childlist;
 383   while (*cc != NULL)
 384     {
 385       struct cleanup *cleanup_child;
 386       cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
 387       print_varobj (*cc, print_values, 1 /* print expression */);
 388       cc++;
 389       do_cleanups (cleanup_child);
 390     }
 391   do_cleanups (cleanup_children);
 392   xfree (childlist);
 393   return MI_CMD_DONE;
 394 }
 395
 396 enum mi_cmd_result
 397 mi_cmd_var_info_type (char *command, char **argv, int argc)
 398 {
 399   struct varobj *var;
 400
 401   if (argc != 1)
 402     error (_("mi_cmd_var_info_type: Usage: NAME."));
 403
 404   /* Get varobj handle, if a valid var obj name was specified */
 405   var = varobj_get_handle (argv[0]);
 406   if (var == NULL)
 407     error (_("mi_cmd_var_info_type: Variable object not found"));
 408
 409   ui_out_field_string (uiout, "type", varobj_get_type (var));
 410   return MI_CMD_DONE;
 411 }
 412
 413 enum mi_cmd_result
 414 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 415 {
 416   enum varobj_languages lang;
 417   struct varobj *var;
 418
 419   if (argc != 1)
 420     error (_("mi_cmd_var_info_expression: Usage: NAME."));
 421
 422   /* Get varobj handle, if a valid var obj name was specified */
 423   var = varobj_get_handle (argv[0]);
 424   if (var == NULL)
 425     error (_("mi_cmd_var_info_expression: Variable object not found"));
 426
 427   lang = varobj_get_language (var);
 428
 429   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 430   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 431   return MI_CMD_DONE;
 432 }
 433
 434 enum mi_cmd_result
 435 mi_cmd_var_show_attributes (char *command, char **argv, int argc)
 436 {
 437   int attr;
 438   char *attstr;
 439   struct varobj *var;
 440
 441   if (argc != 1)
 442     error (_("mi_cmd_var_show_attributes: Usage: NAME."));
 443
 444   /* Get varobj handle, if a valid var obj name was specified */
 445   var = varobj_get_handle (argv[0]);
 446   if (var == NULL)
 447     error (_("mi_cmd_var_show_attributes: Variable object not found"));
 448
 449   attr = varobj_get_attributes (var);
 450   /* FIXME: define masks for attributes */
 451   if (attr & 0x00000001)
 452     attstr = "editable";
 453   else
 454     attstr = "noneditable";
 455
 456   ui_out_field_string (uiout, "attr", attstr);
 457   return MI_CMD_DONE;
 458 }
 459
 460 enum mi_cmd_result
 461 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 462 {
 463   struct varobj *var;
 464
 465   if (argc != 1)
 466     error (_("mi_cmd_var_evaluate_expression: Usage: NAME."));
 467
 468   /* Get varobj handle, if a valid var obj name was specified */
 469   var = varobj_get_handle (argv[0]);
 470   if (var == NULL)
 471     error (_("mi_cmd_var_evaluate_expression: Variable object not found"));
 472
 473   ui_out_field_string (uiout, "value", varobj_get_value (var));
 474   return MI_CMD_DONE;
 475 }
 476
 477 enum mi_cmd_result
 478 mi_cmd_var_assign (char *command, char **argv, int argc)
 479 {
 480   struct varobj *var;
 481   char *expression;
 482
 483   if (argc != 2)
 484     error (_("mi_cmd_var_assign: Usage: NAME EXPRESSION."));
 485
 486   /* Get varobj handle, if a valid var obj name was specified */
 487   var = varobj_get_handle (argv[0]);
 488   if (var == NULL)
 489     error (_("mi_cmd_var_assign: Variable object not found"));
 490
 491   /* FIXME: define masks for attributes */
 492   if (!(varobj_get_attributes (var) & 0x00000001))
 493     error (_("mi_cmd_var_assign: Variable object is not editable"));
 494
 495   expression = xstrdup (argv[1]);
 496
 497   if (!varobj_set_value (var, expression))
 498     error (_("mi_cmd_var_assign: Could not assign expression to variable object"));
 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_update (char *command, char **argv, int argc)
 506 {
 507   struct varobj *var;
 508   struct varobj **rootlist;
 509   struct varobj **cr;
 510   struct cleanup *cleanup;
 511   char *name;
 512   int nv;
 513   enum print_values print_values;
 514
 515   if (argc != 1 && argc != 2)
 516     error (_("mi_cmd_var_update: Usage: [PRINT_VALUES] NAME."));
 517
 518   if (argc == 1)
 519     name = argv[0];
 520   else
 521     name = (argv[1]);
 522
 523   if (argc == 2)
 524     print_values = mi_parse_values_option (argv[0]);
 525   else
 526     print_values = PRINT_NO_VALUES;
 527
 528   /* Check if the parameter is a "*" which means that we want
 529      to update all variables */
 530
 531   if ((*name == '*') && (*(name + 1) == '\0'))
 532     {
 533       nv = varobj_list (&rootlist);
 534       cleanup = make_cleanup (xfree, rootlist);
 535       if (mi_version (uiout) <= 1)
 536         make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 537       else
 538         make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 539       if (nv <= 0)
 540         {
 541           do_cleanups (cleanup);
 542           return MI_CMD_DONE;
 543         }
 544       cr = rootlist;
 545       while (*cr != NULL)
 546         {
 547           varobj_update_one (*cr, print_values, 0 /* implicit */);
 548           cr++;
 549         }
 550       do_cleanups (cleanup);
 551     }
 552   else
 553     {
 554       /* Get varobj handle, if a valid var obj name was specified */
 555       var = varobj_get_handle (name);
 556       if (var == NULL)
 557         error (_("mi_cmd_var_update: Variable object not found"));
 558
 559       if (mi_version (uiout) <= 1)
 560         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 561       else
 562         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 563       varobj_update_one (var, print_values, 1 /* explicit */);
 564       do_cleanups (cleanup);
 565     }
 566     return MI_CMD_DONE;
 567 }
 568
 569 /* Helper for mi_cmd_var_update().  */
 570
 571 static void
 572 varobj_update_one (struct varobj *var, enum print_values print_values,
 573                    int explicit)
 574 {
 575   struct varobj **changelist;
 576   struct varobj **cc;
 577   struct cleanup *cleanup = NULL;
 578   int nc;
 579
 580   nc = varobj_update (&var, &changelist, explicit);
 581
 582   /* nc >= 0  represents the number of changes reported into changelist.
 583      nc < 0   means that an error occured or the the variable has
 584               changed type (TYPE_CHANGED).  */
 585
 586   if (nc == 0)
 587     return;
 588   else if (nc < 0)
 589     {
 590       if (mi_version (uiout) > 1)
 591         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 592       ui_out_field_string (uiout, "name", varobj_get_objname(var));
 593
 594       switch (nc)
 595       {
 596         case NOT_IN_SCOPE:
 597           ui_out_field_string (uiout, "in_scope", "false");
 598           break;
 599         case INVALID:
 600           ui_out_field_string (uiout, "in_scope", "invalid");
 601           break;
 602         case TYPE_CHANGED:
 603           ui_out_field_string (uiout, "in_scope", "true");
 604           ui_out_field_string (uiout, "new_type", varobj_get_type(var));
 605           ui_out_field_int (uiout, "new_num_children",
 606                             varobj_get_num_children(var));
 607           break;
 608       }
 609       if (mi_version (uiout) > 1)
 610         do_cleanups (cleanup);
 611     }
 612   else
 613     {
 614       cc = changelist;
 615       while (*cc != NULL)
 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 (*cc));
 620           if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
 621             ui_out_field_string (uiout, "value", varobj_get_value (*cc));
 622           ui_out_field_string (uiout, "in_scope", "true");
 623           ui_out_field_string (uiout, "type_changed", "false");
 624           if (mi_version (uiout) > 1)
 625             do_cleanups (cleanup);
 626           cc++;
 627         }
 628       xfree (changelist);
 629     }
 630 }