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 int varobj_update_one (struct varobj *var,
  40                               enum print_values print_values);
  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   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
  69 /* VAROBJ operations */
  70
  71 enum mi_cmd_result
  72 mi_cmd_var_create (char *command, char **argv, int argc)
  73 {
  74   CORE_ADDR frameaddr = 0;
  75   struct varobj *var;
  76   char *name;
  77   char *frame;
  78   char *expr;
  79   struct cleanup *old_cleanups;
  80   enum varobj_type var_type;
  81
  82   if (argc != 3)
  83     {
  84       /* mi_error_message = xstrprintf ("mi_cmd_var_create: Usage:
  85          ...."); return MI_CMD_ERROR; */
  86       error (_("mi_cmd_var_create: Usage: NAME FRAME EXPRESSION."));
  87     }
  88
  89   name = xstrdup (argv[0]);
  90   /* Add cleanup for name. Must be free_current_contents as
  91      name can be reallocated */
  92   old_cleanups = make_cleanup (free_current_contents, &name);
  93
  94   frame = xstrdup (argv[1]);
  95   make_cleanup (xfree, frame);
  96
  97   expr = xstrdup (argv[2]);
  98   make_cleanup (xfree, expr);
  99
 100   if (strcmp (name, "-") == 0)
 101     {
 102       xfree (name);
 103       name = varobj_gen_name ();
 104     }
 105   else if (!isalpha (*name))
 106     error (_("mi_cmd_var_create: name of object must begin with a letter"));
 107
 108   if (strcmp (frame, "*") == 0)
 109     var_type = USE_CURRENT_FRAME;
 110   else if (strcmp (frame, "@") == 0)
 111     var_type = USE_SELECTED_FRAME;
 112   else
 113     {
 114       var_type = USE_SPECIFIED_FRAME;
 115       frameaddr = string_to_core_addr (frame);
 116     }
 117
 118   if (varobjdebug)
 119     fprintf_unfiltered (gdb_stdlog,
 120                     "Name=\"%s\", Frame=\"%s\" (0x%s), Expression=\"%s\"\n",
 121                         name, frame, paddr (frameaddr), expr);
 122
 123   var = varobj_create (name, expr, frameaddr, var_type);
 124
 125   if (var == NULL)
 126     error (_("mi_cmd_var_create: unable to create variable object"));
 127
 128   print_varobj (var, PRINT_NO_VALUES, 0 /* don't print expression */);
 129
 130   do_cleanups (old_cleanups);
 131   return MI_CMD_DONE;
 132 }
 133
 134 enum mi_cmd_result
 135 mi_cmd_var_delete (char *command, char **argv, int argc)
 136 {
 137   char *name;
 138   char *expr;
 139   struct varobj *var;
 140   int numdel;
 141   int children_only_p = 0;
 142   struct cleanup *old_cleanups;
 143
 144   if (argc < 1 || argc > 2)
 145     error (_("mi_cmd_var_delete: Usage: [-c] EXPRESSION."));
 146
 147   name = xstrdup (argv[0]);
 148   /* Add cleanup for name. Must be free_current_contents as
 149      name can be reallocated */
 150   old_cleanups = make_cleanup (free_current_contents, &name);
 151
 152   /* If we have one single argument it cannot be '-c' or any string
 153      starting with '-'. */
 154   if (argc == 1)
 155     {
 156       if (strcmp (name, "-c") == 0)
 157         error (_("mi_cmd_var_delete: Missing required argument after '-c': variable object name"));
 158       if (*name == '-')
 159         error (_("mi_cmd_var_delete: Illegal variable object name"));
 160     }
 161
 162   /* If we have 2 arguments they must be '-c' followed by a string
 163      which would be the variable name. */
 164   if (argc == 2)
 165     {
 166       expr = xstrdup (argv[1]);
 167       if (strcmp (name, "-c") != 0)
 168         error (_("mi_cmd_var_delete: Invalid option."));
 169       children_only_p = 1;
 170       xfree (name);
 171       name = xstrdup (expr);
 172       xfree (expr);
 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 = xstrdup (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_show_format (char *command, char **argv, int argc)
 237 {
 238   enum varobj_display_formats format;
 239   struct varobj *var;
 240
 241   if (argc != 1)
 242     error (_("mi_cmd_var_show_format: Usage: NAME."));
 243
 244   /* Get varobj handle, if a valid var obj name was specified */
 245   var = varobj_get_handle (argv[0]);
 246   if (var == NULL)
 247     error (_("mi_cmd_var_show_format: Variable object not found"));
 248
 249   format = varobj_get_display_format (var);
 250
 251   /* Report the current format */
 252   ui_out_field_string (uiout, "format", varobj_format_string[(int) format]);
 253   return MI_CMD_DONE;
 254 }
 255
 256 enum mi_cmd_result
 257 mi_cmd_var_info_num_children (char *command, char **argv, int argc)
 258 {
 259   struct varobj *var;
 260
 261   if (argc != 1)
 262     error (_("mi_cmd_var_info_num_children: Usage: NAME."));
 263
 264   /* Get varobj handle, if a valid var obj name was specified */
 265   var = varobj_get_handle (argv[0]);
 266   if (var == NULL)
 267     error (_("mi_cmd_var_info_num_children: Variable object not found"));
 268
 269   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
 270   return MI_CMD_DONE;
 271 }
 272
 273 /* Parse a string argument into a print_values value.  */
 274
 275 static enum print_values
 276 mi_parse_values_option (const char *arg)
 277 {
 278   if (strcmp (arg, "0") == 0
 279       || strcmp (arg, mi_no_values) == 0)
 280     return PRINT_NO_VALUES;
 281   else if (strcmp (arg, "1") == 0
 282            || strcmp (arg, mi_all_values) == 0)
 283     return PRINT_ALL_VALUES;
 284   else if (strcmp (arg, "2") == 0
 285            || strcmp (arg, mi_simple_values) == 0)
 286     return PRINT_SIMPLE_VALUES;
 287   else
 288     error (_("Unknown value for PRINT_VALUES\n\
 289 Must be: 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
 290            mi_no_values, mi_simple_values, mi_all_values);
 291 }
 292
 293 /* Return 1 if given the argument PRINT_VALUES we should display
 294    a value of type TYPE.  */
 295
 296 static int
 297 mi_print_value_p (struct type *type, enum print_values print_values)
 298 {
 299   if (type != NULL)
 300     type = check_typedef (type);
 301
 302   if (print_values == PRINT_NO_VALUES)
 303     return 0;
 304
 305   if (print_values == PRINT_ALL_VALUES)
 306     return 1;
 307
 308   /* For PRINT_SIMPLE_VALUES, only print the value if it has a type
 309      and that type is not a compound type.  */
 310
 311   return (TYPE_CODE (type) != TYPE_CODE_ARRAY
 312           && TYPE_CODE (type) != TYPE_CODE_STRUCT
 313           && TYPE_CODE (type) != TYPE_CODE_UNION);
 314 }
 315
 316 enum mi_cmd_result
 317 mi_cmd_var_list_children (char *command, char **argv, int argc)
 318 {
 319   struct varobj *var;
 320   struct varobj **childlist;
 321   struct varobj **cc;
 322   struct cleanup *cleanup_children;
 323   int numchild;
 324   enum print_values print_values;
 325
 326   if (argc != 1 && argc != 2)
 327     error (_("mi_cmd_var_list_children: Usage: [PRINT_VALUES] NAME"));
 328
 329   /* Get varobj handle, if a valid var obj name was specified */
 330   if (argc == 1)
 331     var = varobj_get_handle (argv[0]);
 332   else
 333     var = varobj_get_handle (argv[1]);
 334   if (var == NULL)
 335     error (_("Variable object not found"));
 336
 337   numchild = varobj_list_children (var, &childlist);
 338   ui_out_field_int (uiout, "numchild", numchild);
 339   if (argc == 2)
 340     print_values = mi_parse_values_option (argv[0]);
 341   else
 342     print_values = PRINT_NO_VALUES;
 343
 344   if (numchild <= 0)
 345     return MI_CMD_DONE;
 346
 347   if (mi_version (uiout) == 1)
 348     cleanup_children = make_cleanup_ui_out_tuple_begin_end (uiout, "children");
 349   else
 350     cleanup_children = make_cleanup_ui_out_list_begin_end (uiout, "children");
 351   cc = childlist;
 352   while (*cc != NULL)
 353     {
 354       struct cleanup *cleanup_child;
 355       cleanup_child = make_cleanup_ui_out_tuple_begin_end (uiout, "child");
 356       print_varobj (*cc, print_values, 1 /* print expression */);
 357       cc++;
 358       do_cleanups (cleanup_child);
 359     }
 360   do_cleanups (cleanup_children);
 361   xfree (childlist);
 362   return MI_CMD_DONE;
 363 }
 364
 365 enum mi_cmd_result
 366 mi_cmd_var_info_type (char *command, char **argv, int argc)
 367 {
 368   struct varobj *var;
 369
 370   if (argc != 1)
 371     error (_("mi_cmd_var_info_type: Usage: NAME."));
 372
 373   /* Get varobj handle, if a valid var obj name was specified */
 374   var = varobj_get_handle (argv[0]);
 375   if (var == NULL)
 376     error (_("mi_cmd_var_info_type: Variable object not found"));
 377
 378   ui_out_field_string (uiout, "type", varobj_get_type (var));
 379   return MI_CMD_DONE;
 380 }
 381
 382 enum mi_cmd_result
 383 mi_cmd_var_info_expression (char *command, char **argv, int argc)
 384 {
 385   enum varobj_languages lang;
 386   struct varobj *var;
 387
 388   if (argc != 1)
 389     error (_("mi_cmd_var_info_expression: Usage: NAME."));
 390
 391   /* Get varobj handle, if a valid var obj name was specified */
 392   var = varobj_get_handle (argv[0]);
 393   if (var == NULL)
 394     error (_("mi_cmd_var_info_expression: Variable object not found"));
 395
 396   lang = varobj_get_language (var);
 397
 398   ui_out_field_string (uiout, "lang", varobj_language_string[(int) lang]);
 399   ui_out_field_string (uiout, "exp", varobj_get_expression (var));
 400   return MI_CMD_DONE;
 401 }
 402
 403 enum mi_cmd_result
 404 mi_cmd_var_show_attributes (char *command, char **argv, int argc)
 405 {
 406   int attr;
 407   char *attstr;
 408   struct varobj *var;
 409
 410   if (argc != 1)
 411     error (_("mi_cmd_var_show_attributes: Usage: NAME."));
 412
 413   /* Get varobj handle, if a valid var obj name was specified */
 414   var = varobj_get_handle (argv[0]);
 415   if (var == NULL)
 416     error (_("mi_cmd_var_show_attributes: Variable object not found"));
 417
 418   attr = varobj_get_attributes (var);
 419   /* FIXME: define masks for attributes */
 420   if (attr & 0x00000001)
 421     attstr = "editable";
 422   else
 423     attstr = "noneditable";
 424
 425   ui_out_field_string (uiout, "attr", attstr);
 426   return MI_CMD_DONE;
 427 }
 428
 429 enum mi_cmd_result
 430 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 431 {
 432   struct varobj *var;
 433
 434   if (argc != 1)
 435     error (_("mi_cmd_var_evaluate_expression: Usage: NAME."));
 436
 437   /* Get varobj handle, if a valid var obj name was specified */
 438   var = varobj_get_handle (argv[0]);
 439   if (var == NULL)
 440     error (_("mi_cmd_var_evaluate_expression: Variable object not found"));
 441
 442   ui_out_field_string (uiout, "value", varobj_get_value (var));
 443   return MI_CMD_DONE;
 444 }
 445
 446 enum mi_cmd_result
 447 mi_cmd_var_assign (char *command, char **argv, int argc)
 448 {
 449   struct varobj *var;
 450   char *expression;
 451
 452   if (argc != 2)
 453     error (_("mi_cmd_var_assign: Usage: NAME EXPRESSION."));
 454
 455   /* Get varobj handle, if a valid var obj name was specified */
 456   var = varobj_get_handle (argv[0]);
 457   if (var == NULL)
 458     error (_("mi_cmd_var_assign: Variable object not found"));
 459
 460   /* FIXME: define masks for attributes */
 461   if (!(varobj_get_attributes (var) & 0x00000001))
 462     error (_("mi_cmd_var_assign: Variable object is not editable"));
 463
 464   expression = xstrdup (argv[1]);
 465
 466   if (!varobj_set_value (var, expression))
 467     error (_("mi_cmd_var_assign: Could not assign expression to varible object"));
 468
 469   ui_out_field_string (uiout, "value", varobj_get_value (var));
 470   return MI_CMD_DONE;
 471 }
 472
 473 enum mi_cmd_result
 474 mi_cmd_var_update (char *command, char **argv, int argc)
 475 {
 476   struct varobj *var;
 477   struct varobj **rootlist;
 478   struct varobj **cr;
 479   struct cleanup *cleanup;
 480   char *name;
 481   int nv;
 482   enum print_values print_values;
 483
 484   if (argc != 1 && argc != 2)
 485     error (_("mi_cmd_var_update: Usage: [PRINT_VALUES] NAME."));
 486
 487   if (argc == 1)
 488     name = argv[0];
 489   else
 490     name = (argv[1]);
 491
 492   if (argc == 2)
 493     print_values = mi_parse_values_option (argv[0]);
 494   else
 495     print_values = PRINT_NO_VALUES;
 496
 497   /* Check if the parameter is a "*" which means that we want
 498      to update all variables */
 499
 500   if ((*name == '*') && (*(name + 1) == '\0'))
 501     {
 502       nv = varobj_list (&rootlist);
 503       cleanup = make_cleanup (xfree, rootlist);
 504       if (mi_version (uiout) <= 1)
 505         make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 506       else
 507         make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 508       if (nv <= 0)
 509         {
 510           do_cleanups (cleanup);
 511           return MI_CMD_DONE;
 512         }
 513       cr = rootlist;
 514       while (*cr != NULL)
 515         {
 516           varobj_update_one (*cr, print_values);
 517           cr++;
 518         }
 519       do_cleanups (cleanup);
 520     }
 521   else
 522     {
 523       /* Get varobj handle, if a valid var obj name was specified */
 524       var = varobj_get_handle (name);
 525       if (var == NULL)
 526         error (_("mi_cmd_var_update: Variable object not found"));
 527
 528       if (mi_version (uiout) <= 1)
 529         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "changelist");
 530       else
 531         cleanup = make_cleanup_ui_out_list_begin_end (uiout, "changelist");
 532       varobj_update_one (var, print_values);
 533       do_cleanups (cleanup);
 534     }
 535     return MI_CMD_DONE;
 536 }
 537
 538 /* Helper for mi_cmd_var_update() Returns 0 if the update for
 539    the variable fails (usually because the variable is out of
 540    scope), and 1 if it succeeds. */
 541
 542 static int
 543 varobj_update_one (struct varobj *var, enum print_values print_values)
 544 {
 545   struct varobj **changelist;
 546   struct varobj **cc;
 547   struct cleanup *cleanup = NULL;
 548   int nc;
 549
 550   nc = varobj_update (&var, &changelist);
 551
 552   /* nc == 0 means that nothing has changed.
 553      nc == -1 means that an error occured in updating the variable.
 554      nc == -2 means the variable has changed type. */
 555
 556   if (nc == 0)
 557     return 1;
 558   else if (nc == -1)
 559     {
 560       if (mi_version (uiout) > 1)
 561         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 562       ui_out_field_string (uiout, "name", varobj_get_objname(var));
 563       ui_out_field_string (uiout, "in_scope", "false");
 564       if (mi_version (uiout) > 1)
 565         do_cleanups (cleanup);
 566       return -1;
 567     }
 568   else if (nc == -2)
 569     {
 570       if (mi_version (uiout) > 1)
 571         cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 572       ui_out_field_string (uiout, "name", varobj_get_objname (var));
 573       ui_out_field_string (uiout, "in_scope", "true");
 574       ui_out_field_string (uiout, "new_type", varobj_get_type(var));
 575       ui_out_field_int (uiout, "new_num_children",
 576                            varobj_get_num_children(var));
 577       if (mi_version (uiout) > 1)
 578         do_cleanups (cleanup);
 579     }
 580   else
 581     {
 582
 583       cc = changelist;
 584       while (*cc != NULL)
 585         {
 586           if (mi_version (uiout) > 1)
 587             cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 588           ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
 589           if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
 590             ui_out_field_string (uiout, "value", varobj_get_value (*cc));
 591           ui_out_field_string (uiout, "in_scope", "true");
 592           ui_out_field_string (uiout, "type_changed", "false");
 593           if (mi_version (uiout) > 1)
 594             do_cleanups (cleanup);
 595           cc++;
 596         }
 597       xfree (changelist);
 598       return 1;
 599     }
 600   return 1;
 601 }