gdb/m2-valprint.c

   1 /* Support for printing Modula 2 values for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986, 1988-1989, 1991-1992, 1996, 1998, 2000, 2005-2012
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "symtab.h"
  23 #include "gdbtypes.h"
  24 #include "expression.h"
  25 #include "value.h"
  26 #include "valprint.h"
  27 #include "language.h"
  28 #include "typeprint.h"
  29 #include "c-lang.h"
  30 #include "m2-lang.h"
  31 #include "target.h"
  32
  33 static int print_unpacked_pointer (struct type *type,
  34                                    CORE_ADDR address, CORE_ADDR addr,
  35                                    const struct value_print_options *options,
  36                                    struct ui_file *stream);
  37 static void
  38 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
  39                          int embedded_offset, CORE_ADDR address,
  40                          struct ui_file *stream, int recurse,
  41                          const struct value *val,
  42                          const struct value_print_options *options,
  43                          int len);
  44
  45
  46 /* get_long_set_bounds - assigns the bounds of the long set to low and
  47                          high.  */
  48
  49 int
  50 get_long_set_bounds (struct type *type, LONGEST *low, LONGEST *high)
  51 {
  52   int len, i;
  53
  54   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
  55     {
  56       len = TYPE_NFIELDS (type);
  57       i = TYPE_N_BASECLASSES (type);
  58       if (len == 0)
  59         return 0;
  60       *low = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)));
  61       *high = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type,
  62                                                                  len-1)));
  63       return 1;
  64     }
  65   error (_("expecting long_set"));
  66   return 0;
  67 }
  68
  69 static void
  70 m2_print_long_set (struct type *type, const gdb_byte *valaddr,
  71                    int embedded_offset, CORE_ADDR address,
  72                    struct ui_file *stream)
  73 {
  74   int empty_set        = 1;
  75   int element_seen     = 0;
  76   LONGEST previous_low = 0;
  77   LONGEST previous_high= 0;
  78   LONGEST i, low_bound, high_bound;
  79   LONGEST field_low, field_high;
  80   struct type *range;
  81   int len, field;
  82   struct type *target;
  83   int bitval;
  84
  85   CHECK_TYPEDEF (type);
  86
  87   fprintf_filtered (stream, "{");
  88   len = TYPE_NFIELDS (type);
  89   if (get_long_set_bounds (type, &low_bound, &high_bound))
  90     {
  91       field = TYPE_N_BASECLASSES (type);
  92       range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
  93     }
  94   else
  95     {
  96       fprintf_filtered (stream, " %s }", _("<unknown bounds of set>"));
  97       return;
  98     }
  99
 100   target = TYPE_TARGET_TYPE (range);
 101
 102   if (get_discrete_bounds (range, &field_low, &field_high) >= 0)
 103     {
 104       for (i = low_bound; i <= high_bound; i++)
 105         {
 106           bitval = value_bit_index (TYPE_FIELD_TYPE (type, field),
 107                                     (TYPE_FIELD_BITPOS (type, field) / 8) +
 108                                     valaddr + embedded_offset, i);
 109           if (bitval < 0)
 110             error (_("bit test is out of range"));
 111           else if (bitval > 0)
 112             {
 113               previous_high = i;
 114               if (! element_seen)
 115                 {
 116                   if (! empty_set)
 117                     fprintf_filtered (stream, ", ");
 118                   print_type_scalar (target, i, stream);
 119                   empty_set    = 0;
 120                   element_seen = 1;
 121                   previous_low = i;
 122                 }
 123             }
 124           else
 125             {
 126               /* bit is not set */
 127               if (element_seen)
 128                 {
 129                   if (previous_low+1 < previous_high)
 130                     fprintf_filtered (stream, "..");
 131                   if (previous_low+1 < previous_high)
 132                     print_type_scalar (target, previous_high, stream);
 133                   element_seen = 0;
 134                 }
 135             }
 136           if (i == field_high)
 137             {
 138               field++;
 139               if (field == len)
 140                 break;
 141               range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
 142               if (get_discrete_bounds (range, &field_low, &field_high) < 0)
 143                 break;
 144               target = TYPE_TARGET_TYPE (range);
 145             }
 146         }
 147       if (element_seen)
 148         {
 149           if (previous_low+1 < previous_high)
 150             {
 151               fprintf_filtered (stream, "..");
 152               print_type_scalar (target, previous_high, stream);
 153             }
 154           element_seen = 0;
 155         }
 156       fprintf_filtered (stream, "}");
 157     }
 158 }
 159
 160 static void
 161 m2_print_unbounded_array (struct type *type, const gdb_byte *valaddr,
 162                           int embedded_offset, CORE_ADDR address,
 163                           struct ui_file *stream, int recurse,
 164                           const struct value_print_options *options)
 165 {
 166   struct type *content_type;
 167   CORE_ADDR addr;
 168   LONGEST len;
 169   struct value *val;
 170
 171   CHECK_TYPEDEF (type);
 172   content_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0));
 173
 174   addr = unpack_pointer (TYPE_FIELD_TYPE (type, 0),
 175                          (TYPE_FIELD_BITPOS (type, 0) / 8) +
 176                          valaddr + embedded_offset);
 177
 178   val = value_at_lazy (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)),
 179                        addr);
 180   len = unpack_field_as_long (type, valaddr + embedded_offset, 1);
 181
 182   fprintf_filtered (stream, "{");
 183   m2_print_array_contents (value_type (val),
 184                            value_contents_for_printing (val),
 185                            value_embedded_offset (val), addr, stream,
 186                            recurse, val, options, len);
 187   fprintf_filtered (stream, ", HIGH = %d}", (int) len);
 188 }
 189
 190 static int
 191 print_unpacked_pointer (struct type *type,
 192                         CORE_ADDR address, CORE_ADDR addr,
 193                         const struct value_print_options *options,
 194                         struct ui_file *stream)
 195 {
 196   struct gdbarch *gdbarch = get_type_arch (type);
 197   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 198
 199   if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 200     {
 201       /* Try to print what function it points to.  */
 202       print_function_pointer_address (gdbarch, addr, stream,
 203                                       options->addressprint);
 204       /* Return value is irrelevant except for string pointers.  */
 205       return 0;
 206     }
 207
 208   if (options->addressprint && options->format != 's')
 209     fputs_filtered (paddress (gdbarch, address), stream);
 210
 211   /* For a pointer to char or unsigned char, also print the string
 212      pointed to, unless pointer is null.  */
 213
 214   if (TYPE_LENGTH (elttype) == 1
 215       && TYPE_CODE (elttype) == TYPE_CODE_INT
 216       && (options->format == 0 || options->format == 's')
 217       && addr != 0)
 218     return val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
 219                              stream, options);
 220
 221   return 0;
 222 }
 223
 224 static void
 225 print_variable_at_address (struct type *type,
 226                            const gdb_byte *valaddr,
 227                            struct ui_file *stream,
 228                            int recurse,
 229                            const struct value_print_options *options)
 230 {
 231   struct gdbarch *gdbarch = get_type_arch (type);
 232   CORE_ADDR addr = unpack_pointer (type, valaddr);
 233   struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
 234
 235   fprintf_filtered (stream, "[");
 236   fputs_filtered (paddress (gdbarch, addr), stream);
 237   fprintf_filtered (stream, "] : ");
 238
 239   if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 240     {
 241       struct value *deref_val =
 242         value_at (TYPE_TARGET_TYPE (type), unpack_pointer (type, valaddr));
 243
 244       common_val_print (deref_val, stream, recurse, options, current_language);
 245     }
 246   else
 247     fputs_filtered ("???", stream);
 248 }
 249
 250
 251 /* m2_print_array_contents - prints out the contents of an
 252                              array up to a max_print values.
 253                              It prints arrays of char as a string
 254                              and all other data types as comma
 255                              separated values.  */
 256
 257 static void
 258 m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
 259                          int embedded_offset, CORE_ADDR address,
 260                          struct ui_file *stream, int recurse,
 261                          const struct value *val,
 262                          const struct value_print_options *options,
 263                          int len)
 264 {
 265   int eltlen;
 266   CHECK_TYPEDEF (type);
 267
 268   if (TYPE_LENGTH (type) > 0)
 269     {
 270       eltlen = TYPE_LENGTH (type);
 271       if (options->prettyprint_arrays)
 272         print_spaces_filtered (2 + 2 * recurse, stream);
 273       /* For an array of chars, print with string syntax.  */
 274       if (eltlen == 1 &&
 275           ((TYPE_CODE (type) == TYPE_CODE_INT)
 276            || ((current_language->la_language == language_m2)
 277                && (TYPE_CODE (type) == TYPE_CODE_CHAR)))
 278           && (options->format == 0 || options->format == 's'))
 279         val_print_string (type, NULL, address, len+1, stream, options);
 280       else
 281         {
 282           fprintf_filtered (stream, "{");
 283           val_print_array_elements (type, valaddr, embedded_offset,
 284                                     address, stream, recurse, val,
 285                                     options, 0);
 286           fprintf_filtered (stream, "}");
 287         }
 288     }
 289 }
 290
 291
 292 /* See val_print for a description of the various parameters of this
 293    function; they are identical.  The semantics of the return value is
 294    also identical to val_print.  */
 295
 296 int
 297 m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 298               CORE_ADDR address, struct ui_file *stream, int recurse,
 299               const struct value *original_value,
 300               const struct value_print_options *options)
 301 {
 302   struct gdbarch *gdbarch = get_type_arch (type);
 303   unsigned int i = 0;   /* Number of characters printed.  */
 304   unsigned len;
 305   struct type *elttype;
 306   unsigned eltlen;
 307   LONGEST val;
 308   CORE_ADDR addr;
 309
 310   CHECK_TYPEDEF (type);
 311   switch (TYPE_CODE (type))
 312     {
 313     case TYPE_CODE_ARRAY:
 314       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
 315         {
 316           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 317           eltlen = TYPE_LENGTH (elttype);
 318           len = TYPE_LENGTH (type) / eltlen;
 319           if (options->prettyprint_arrays)
 320             print_spaces_filtered (2 + 2 * recurse, stream);
 321           /* For an array of chars, print with string syntax.  */
 322           if (eltlen == 1 &&
 323               ((TYPE_CODE (elttype) == TYPE_CODE_INT)
 324                || ((current_language->la_language == language_m2)
 325                    && (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
 326               && (options->format == 0 || options->format == 's'))
 327             {
 328               /* If requested, look for the first null char and only print
 329                  elements up to it.  */
 330               if (options->stop_print_at_null)
 331                 {
 332                   unsigned int temp_len;
 333
 334                   /* Look for a NULL char.  */
 335                   for (temp_len = 0;
 336                        (valaddr + embedded_offset)[temp_len]
 337                          && temp_len < len && temp_len < options->print_max;
 338                        temp_len++);
 339                   len = temp_len;
 340                 }
 341
 342               LA_PRINT_STRING (stream, TYPE_TARGET_TYPE (type),
 343                                valaddr + embedded_offset, len, NULL,
 344                                0, options);
 345               i = len;
 346             }
 347           else
 348             {
 349               fprintf_filtered (stream, "{");
 350               val_print_array_elements (type, valaddr, embedded_offset,
 351                                         address, stream,
 352                                         recurse, original_value,
 353                                         options, 0);
 354               fprintf_filtered (stream, "}");
 355             }
 356           break;
 357         }
 358       /* Array of unspecified length: treat like pointer to first elt.  */
 359       print_unpacked_pointer (type, address, address, options, stream);
 360       break;
 361
 362     case TYPE_CODE_PTR:
 363       if (TYPE_CONST (type))
 364         print_variable_at_address (type, valaddr + embedded_offset,
 365                                    stream, recurse, options);
 366       else if (options->format && options->format != 's')
 367         val_print_scalar_formatted (type, valaddr, embedded_offset,
 368                                     original_value, options, 0, stream);
 369       else
 370         {
 371           addr = unpack_pointer (type, valaddr + embedded_offset);
 372           print_unpacked_pointer (type, addr, address, options, stream);
 373         }
 374       break;
 375
 376     case TYPE_CODE_REF:
 377       elttype = check_typedef (TYPE_TARGET_TYPE (type));
 378       if (options->addressprint)
 379         {
 380           CORE_ADDR addr
 381             = extract_typed_address (valaddr + embedded_offset, type);
 382
 383           fprintf_filtered (stream, "@");
 384           fputs_filtered (paddress (gdbarch, addr), stream);
 385           if (options->deref_ref)
 386             fputs_filtered (": ", stream);
 387         }
 388       /* De-reference the reference.  */
 389       if (options->deref_ref)
 390         {
 391           if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 392             {
 393               struct value *deref_val =
 394                 value_at
 395                 (TYPE_TARGET_TYPE (type),
 396                  unpack_pointer (type, valaddr + embedded_offset));
 397
 398               common_val_print (deref_val, stream, recurse, options,
 399                                 current_language);
 400             }
 401           else
 402             fputs_filtered ("???", stream);
 403         }
 404       break;
 405
 406     case TYPE_CODE_UNION:
 407       if (recurse && !options->unionprint)
 408         {
 409           fprintf_filtered (stream, "{...}");
 410           break;
 411         }
 412       /* Fall through.  */
 413     case TYPE_CODE_STRUCT:
 414       if (m2_is_long_set (type))
 415         m2_print_long_set (type, valaddr, embedded_offset, address,
 416                            stream);
 417       else if (m2_is_unbounded_array (type))
 418         m2_print_unbounded_array (type, valaddr, embedded_offset,
 419                                   address, stream, recurse, options);
 420       else
 421         cp_print_value_fields (type, type, valaddr, embedded_offset,
 422                                address, stream, recurse, original_value,
 423                                options, NULL, 0);
 424       break;
 425
 426     case TYPE_CODE_ENUM:
 427       if (options->format)
 428         {
 429           val_print_scalar_formatted (type, valaddr, embedded_offset,
 430                                       original_value, options, 0, stream);
 431           break;
 432         }
 433       len = TYPE_NFIELDS (type);
 434       val = unpack_long (type, valaddr + embedded_offset);
 435       for (i = 0; i < len; i++)
 436         {
 437           QUIT;
 438           if (val == TYPE_FIELD_BITPOS (type, i))
 439             {
 440               break;
 441             }
 442         }
 443       if (i < len)
 444         {
 445           fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
 446         }
 447       else
 448         {
 449           print_longest (stream, 'd', 0, val);
 450         }
 451       break;
 452
 453     case TYPE_CODE_FUNC:
 454       if (options->format)
 455         {
 456           val_print_scalar_formatted (type, valaddr, embedded_offset,
 457                                       original_value, options, 0, stream);
 458           break;
 459         }
 460       /* FIXME, we should consider, at least for ANSI C language, eliminating
 461          the distinction made between FUNCs and POINTERs to FUNCs.  */
 462       fprintf_filtered (stream, "{");
 463       type_print (type, "", stream, -1);
 464       fprintf_filtered (stream, "} ");
 465       /* Try to print what function it points to, and its address.  */
 466       print_address_demangle (gdbarch, address, stream, demangle);
 467       break;
 468
 469     case TYPE_CODE_BOOL:
 470       if (options->format || options->output_format)
 471         {
 472           struct value_print_options opts = *options;
 473
 474           opts.format = (options->format ? options->format
 475                          : options->output_format);
 476           val_print_scalar_formatted (type, valaddr, embedded_offset,
 477                                       original_value, &opts, 0, stream);
 478         }
 479       else
 480         {
 481           val = unpack_long (type, valaddr + embedded_offset);
 482           if (val == 0)
 483             fputs_filtered ("FALSE", stream);
 484           else if (val == 1)
 485             fputs_filtered ("TRUE", stream);
 486           else
 487             fprintf_filtered (stream, "%ld)", (long int) val);
 488         }
 489       break;
 490
 491     case TYPE_CODE_RANGE:
 492       if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
 493         {
 494           m2_val_print (TYPE_TARGET_TYPE (type), valaddr, embedded_offset,
 495                         address, stream, recurse, original_value, options);
 496           break;
 497         }
 498       /* FIXME: create_range_type does not set the unsigned bit in a
 499          range type (I think it probably should copy it from the target
 500          type), so we won't print values which are too large to
 501          fit in a signed integer correctly.  */
 502       /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
 503          print with the target type, though, because the size of our type
 504          and the target type might differ).  */
 505       /* FALLTHROUGH */
 506
 507     case TYPE_CODE_INT:
 508       if (options->format || options->output_format)
 509         {
 510           struct value_print_options opts = *options;
 511
 512           opts.format = (options->format ? options->format
 513                          : options->output_format);
 514           val_print_scalar_formatted (type, valaddr, embedded_offset,
 515                                       original_value, &opts, 0, stream);
 516         }
 517       else
 518         val_print_type_code_int (type, valaddr + embedded_offset, stream);
 519       break;
 520
 521     case TYPE_CODE_CHAR:
 522       if (options->format || options->output_format)
 523         {
 524           struct value_print_options opts = *options;
 525
 526           opts.format = (options->format ? options->format
 527                          : options->output_format);
 528           val_print_scalar_formatted (type, valaddr, embedded_offset,
 529                                       original_value, &opts, 0, stream);
 530         }
 531       else
 532         {
 533           val = unpack_long (type, valaddr + embedded_offset);
 534           if (TYPE_UNSIGNED (type))
 535             fprintf_filtered (stream, "%u", (unsigned int) val);
 536           else
 537             fprintf_filtered (stream, "%d", (int) val);
 538           fputs_filtered (" ", stream);
 539           LA_PRINT_CHAR ((unsigned char) val, type, stream);
 540         }
 541       break;
 542
 543     case TYPE_CODE_FLT:
 544       if (options->format)
 545         val_print_scalar_formatted (type, valaddr, embedded_offset,
 546                                     original_value, options, 0, stream);
 547       else
 548         print_floating (valaddr + embedded_offset, type, stream);
 549       break;
 550
 551     case TYPE_CODE_METHOD:
 552       break;
 553
 554     case TYPE_CODE_BITSTRING:
 555     case TYPE_CODE_SET:
 556       elttype = TYPE_INDEX_TYPE (type);
 557       CHECK_TYPEDEF (elttype);
 558       if (TYPE_STUB (elttype))
 559         {
 560           fprintf_filtered (stream, _("<incomplete type>"));
 561           gdb_flush (stream);
 562           break;
 563         }
 564       else
 565         {
 566           struct type *range = elttype;
 567           LONGEST low_bound, high_bound;
 568           int i;
 569           int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
 570           int need_comma = 0;
 571
 572           if (is_bitstring)
 573             fputs_filtered ("B'", stream);
 574           else
 575             fputs_filtered ("{", stream);
 576
 577           i = get_discrete_bounds (range, &low_bound, &high_bound);
 578         maybe_bad_bstring:
 579           if (i < 0)
 580             {
 581               fputs_filtered (_("<error value>"), stream);
 582               goto done;
 583             }
 584
 585           for (i = low_bound; i <= high_bound; i++)
 586             {
 587               int element = value_bit_index (type, valaddr + embedded_offset,
 588                                              i);
 589
 590               if (element < 0)
 591                 {
 592                   i = element;
 593                   goto maybe_bad_bstring;
 594                 }
 595               if (is_bitstring)
 596                 fprintf_filtered (stream, "%d", element);
 597               else if (element)
 598                 {
 599                   if (need_comma)
 600                     fputs_filtered (", ", stream);
 601                   print_type_scalar (range, i, stream);
 602                   need_comma = 1;
 603
 604                   if (i + 1 <= high_bound
 605                       && value_bit_index (type, valaddr + embedded_offset,
 606                                           ++i))
 607                     {
 608                       int j = i;
 609
 610                       fputs_filtered ("..", stream);
 611                       while (i + 1 <= high_bound
 612                              && value_bit_index (type,
 613                                                  valaddr + embedded_offset,
 614                                                  ++i))
 615                         j = i;
 616                       print_type_scalar (range, j, stream);
 617                     }
 618                 }
 619             }
 620         done:
 621           if (is_bitstring)
 622             fputs_filtered ("'", stream);
 623           else
 624             fputs_filtered ("}", stream);
 625         }
 626       break;
 627
 628     case TYPE_CODE_VOID:
 629       fprintf_filtered (stream, "void");
 630       break;
 631
 632     case TYPE_CODE_ERROR:
 633       fprintf_filtered (stream, "%s", TYPE_ERROR_NAME (type));
 634       break;
 635
 636     case TYPE_CODE_UNDEF:
 637       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 638          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 639          and no complete type for struct foo in that file.  */
 640       fprintf_filtered (stream, _("<incomplete type>"));
 641       break;
 642
 643     default:
 644       error (_("Invalid m2 type code %d in symbol table."), TYPE_CODE (type));
 645     }
 646   gdb_flush (stream);
 647   return (0);
 648 }