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.  */
 294
 295 void
 296 m2_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
 297               CORE_ADDR address, struct ui_file *stream, int recurse,
 298               const struct value *original_value,
 299               const struct value_print_options *options)
 300 {
 301   struct gdbarch *gdbarch = get_type_arch (type);
 302   unsigned int i = 0;   /* Number of characters printed.  */
 303   unsigned len;
 304   struct type *elttype;
 305   unsigned eltlen;
 306   LONGEST val;
 307   CORE_ADDR addr;
 308
 309   CHECK_TYPEDEF (type);
 310   switch (TYPE_CODE (type))
 311     {
 312     case TYPE_CODE_ARRAY:
 313       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
 314         {
 315           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 316           eltlen = TYPE_LENGTH (elttype);
 317           len = TYPE_LENGTH (type) / eltlen;
 318           if (options->prettyprint_arrays)
 319             print_spaces_filtered (2 + 2 * recurse, stream);
 320           /* For an array of chars, print with string syntax.  */
 321           if (eltlen == 1 &&
 322               ((TYPE_CODE (elttype) == TYPE_CODE_INT)
 323                || ((current_language->la_language == language_m2)
 324                    && (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
 325               && (options->format == 0 || options->format == 's'))
 326             {
 327               /* If requested, look for the first null char and only print
 328                  elements up to it.  */
 329               if (options->stop_print_at_null)
 330                 {
 331                   unsigned int temp_len;
 332
 333                   /* Look for a NULL char.  */
 334                   for (temp_len = 0;
 335                        (valaddr + embedded_offset)[temp_len]
 336                          && temp_len < len && temp_len < options->print_max;
 337                        temp_len++);
 338                   len = temp_len;
 339                 }
 340
 341               LA_PRINT_STRING (stream, TYPE_TARGET_TYPE (type),
 342                                valaddr + embedded_offset, len, NULL,
 343                                0, options);
 344               i = len;
 345             }
 346           else
 347             {
 348               fprintf_filtered (stream, "{");
 349               val_print_array_elements (type, valaddr, embedded_offset,
 350                                         address, stream,
 351                                         recurse, original_value,
 352                                         options, 0);
 353               fprintf_filtered (stream, "}");
 354             }
 355           break;
 356         }
 357       /* Array of unspecified length: treat like pointer to first elt.  */
 358       print_unpacked_pointer (type, address, address, options, stream);
 359       break;
 360
 361     case TYPE_CODE_PTR:
 362       if (TYPE_CONST (type))
 363         print_variable_at_address (type, valaddr + embedded_offset,
 364                                    stream, recurse, options);
 365       else if (options->format && options->format != 's')
 366         val_print_scalar_formatted (type, valaddr, embedded_offset,
 367                                     original_value, options, 0, stream);
 368       else
 369         {
 370           addr = unpack_pointer (type, valaddr + embedded_offset);
 371           print_unpacked_pointer (type, addr, address, options, stream);
 372         }
 373       break;
 374
 375     case TYPE_CODE_REF:
 376       elttype = check_typedef (TYPE_TARGET_TYPE (type));
 377       if (options->addressprint)
 378         {
 379           CORE_ADDR addr
 380             = extract_typed_address (valaddr + embedded_offset, type);
 381
 382           fprintf_filtered (stream, "@");
 383           fputs_filtered (paddress (gdbarch, addr), stream);
 384           if (options->deref_ref)
 385             fputs_filtered (": ", stream);
 386         }
 387       /* De-reference the reference.  */
 388       if (options->deref_ref)
 389         {
 390           if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 391             {
 392               struct value *deref_val =
 393                 value_at
 394                 (TYPE_TARGET_TYPE (type),
 395                  unpack_pointer (type, valaddr + embedded_offset));
 396
 397               common_val_print (deref_val, stream, recurse, options,
 398                                 current_language);
 399             }
 400           else
 401             fputs_filtered ("???", stream);
 402         }
 403       break;
 404
 405     case TYPE_CODE_UNION:
 406       if (recurse && !options->unionprint)
 407         {
 408           fprintf_filtered (stream, "{...}");
 409           break;
 410         }
 411       /* Fall through.  */
 412     case TYPE_CODE_STRUCT:
 413       if (m2_is_long_set (type))
 414         m2_print_long_set (type, valaddr, embedded_offset, address,
 415                            stream);
 416       else if (m2_is_unbounded_array (type))
 417         m2_print_unbounded_array (type, valaddr, embedded_offset,
 418                                   address, stream, recurse, options);
 419       else
 420         cp_print_value_fields (type, type, valaddr, embedded_offset,
 421                                address, stream, recurse, original_value,
 422                                options, NULL, 0);
 423       break;
 424
 425     case TYPE_CODE_ENUM:
 426       if (options->format)
 427         {
 428           val_print_scalar_formatted (type, valaddr, embedded_offset,
 429                                       original_value, options, 0, stream);
 430           break;
 431         }
 432       len = TYPE_NFIELDS (type);
 433       val = unpack_long (type, valaddr + embedded_offset);
 434       for (i = 0; i < len; i++)
 435         {
 436           QUIT;
 437           if (val == TYPE_FIELD_BITPOS (type, i))
 438             {
 439               break;
 440             }
 441         }
 442       if (i < len)
 443         {
 444           fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
 445         }
 446       else
 447         {
 448           print_longest (stream, 'd', 0, val);
 449         }
 450       break;
 451
 452     case TYPE_CODE_FUNC:
 453       if (options->format)
 454         {
 455           val_print_scalar_formatted (type, valaddr, embedded_offset,
 456                                       original_value, options, 0, stream);
 457           break;
 458         }
 459       /* FIXME, we should consider, at least for ANSI C language, eliminating
 460          the distinction made between FUNCs and POINTERs to FUNCs.  */
 461       fprintf_filtered (stream, "{");
 462       type_print (type, "", stream, -1);
 463       fprintf_filtered (stream, "} ");
 464       /* Try to print what function it points to, and its address.  */
 465       print_address_demangle (gdbarch, address, stream, demangle);
 466       break;
 467
 468     case TYPE_CODE_BOOL:
 469       if (options->format || options->output_format)
 470         {
 471           struct value_print_options opts = *options;
 472
 473           opts.format = (options->format ? options->format
 474                          : options->output_format);
 475           val_print_scalar_formatted (type, valaddr, embedded_offset,
 476                                       original_value, &opts, 0, stream);
 477         }
 478       else
 479         {
 480           val = unpack_long (type, valaddr + embedded_offset);
 481           if (val == 0)
 482             fputs_filtered ("FALSE", stream);
 483           else if (val == 1)
 484             fputs_filtered ("TRUE", stream);
 485           else
 486             fprintf_filtered (stream, "%ld)", (long int) val);
 487         }
 488       break;
 489
 490     case TYPE_CODE_RANGE:
 491       if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
 492         {
 493           m2_val_print (TYPE_TARGET_TYPE (type), valaddr, embedded_offset,
 494                         address, stream, recurse, original_value, options);
 495           break;
 496         }
 497       /* FIXME: create_range_type does not set the unsigned bit in a
 498          range type (I think it probably should copy it from the target
 499          type), so we won't print values which are too large to
 500          fit in a signed integer correctly.  */
 501       /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
 502          print with the target type, though, because the size of our type
 503          and the target type might differ).  */
 504       /* FALLTHROUGH */
 505
 506     case TYPE_CODE_INT:
 507       if (options->format || options->output_format)
 508         {
 509           struct value_print_options opts = *options;
 510
 511           opts.format = (options->format ? options->format
 512                          : options->output_format);
 513           val_print_scalar_formatted (type, valaddr, embedded_offset,
 514                                       original_value, &opts, 0, stream);
 515         }
 516       else
 517         val_print_type_code_int (type, valaddr + embedded_offset, stream);
 518       break;
 519
 520     case TYPE_CODE_CHAR:
 521       if (options->format || options->output_format)
 522         {
 523           struct value_print_options opts = *options;
 524
 525           opts.format = (options->format ? options->format
 526                          : options->output_format);
 527           val_print_scalar_formatted (type, valaddr, embedded_offset,
 528                                       original_value, &opts, 0, stream);
 529         }
 530       else
 531         {
 532           val = unpack_long (type, valaddr + embedded_offset);
 533           if (TYPE_UNSIGNED (type))
 534             fprintf_filtered (stream, "%u", (unsigned int) val);
 535           else
 536             fprintf_filtered (stream, "%d", (int) val);
 537           fputs_filtered (" ", stream);
 538           LA_PRINT_CHAR ((unsigned char) val, type, stream);
 539         }
 540       break;
 541
 542     case TYPE_CODE_FLT:
 543       if (options->format)
 544         val_print_scalar_formatted (type, valaddr, embedded_offset,
 545                                     original_value, options, 0, stream);
 546       else
 547         print_floating (valaddr + embedded_offset, type, stream);
 548       break;
 549
 550     case TYPE_CODE_METHOD:
 551       break;
 552
 553     case TYPE_CODE_BITSTRING:
 554     case TYPE_CODE_SET:
 555       elttype = TYPE_INDEX_TYPE (type);
 556       CHECK_TYPEDEF (elttype);
 557       if (TYPE_STUB (elttype))
 558         {
 559           fprintf_filtered (stream, _("<incomplete type>"));
 560           gdb_flush (stream);
 561           break;
 562         }
 563       else
 564         {
 565           struct type *range = elttype;
 566           LONGEST low_bound, high_bound;
 567           int i;
 568           int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
 569           int need_comma = 0;
 570
 571           if (is_bitstring)
 572             fputs_filtered ("B'", stream);
 573           else
 574             fputs_filtered ("{", stream);
 575
 576           i = get_discrete_bounds (range, &low_bound, &high_bound);
 577         maybe_bad_bstring:
 578           if (i < 0)
 579             {
 580               fputs_filtered (_("<error value>"), stream);
 581               goto done;
 582             }
 583
 584           for (i = low_bound; i <= high_bound; i++)
 585             {
 586               int element = value_bit_index (type, valaddr + embedded_offset,
 587                                              i);
 588
 589               if (element < 0)
 590                 {
 591                   i = element;
 592                   goto maybe_bad_bstring;
 593                 }
 594               if (is_bitstring)
 595                 fprintf_filtered (stream, "%d", element);
 596               else if (element)
 597                 {
 598                   if (need_comma)
 599                     fputs_filtered (", ", stream);
 600                   print_type_scalar (range, i, stream);
 601                   need_comma = 1;
 602
 603                   if (i + 1 <= high_bound
 604                       && value_bit_index (type, valaddr + embedded_offset,
 605                                           ++i))
 606                     {
 607                       int j = i;
 608
 609                       fputs_filtered ("..", stream);
 610                       while (i + 1 <= high_bound
 611                              && value_bit_index (type,
 612                                                  valaddr + embedded_offset,
 613                                                  ++i))
 614                         j = i;
 615                       print_type_scalar (range, j, stream);
 616                     }
 617                 }
 618             }
 619         done:
 620           if (is_bitstring)
 621             fputs_filtered ("'", stream);
 622           else
 623             fputs_filtered ("}", stream);
 624         }
 625       break;
 626
 627     case TYPE_CODE_VOID:
 628       fprintf_filtered (stream, "void");
 629       break;
 630
 631     case TYPE_CODE_ERROR:
 632       fprintf_filtered (stream, "%s", TYPE_ERROR_NAME (type));
 633       break;
 634
 635     case TYPE_CODE_UNDEF:
 636       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 637          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 638          and no complete type for struct foo in that file.  */
 639       fprintf_filtered (stream, _("<incomplete type>"));
 640       break;
 641
 642     default:
 643       error (_("Invalid m2 type code %d in symbol table."), TYPE_CODE (type));
 644     }
 645   gdb_flush (stream);
 646 }