gdb/p-valprint.c

   1 /* Support for printing Pascal values for GDB, the GNU debugger.
   2
   3    Copyright (C) 2000, 2001, 2003, 2005, 2006, 2007
   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 /* This file is derived from c-valprint.c */
  22
  23 #include "defs.h"
  24 #include "gdb_obstack.h"
  25 #include "symtab.h"
  26 #include "gdbtypes.h"
  27 #include "expression.h"
  28 #include "value.h"
  29 #include "command.h"
  30 #include "gdbcmd.h"
  31 #include "gdbcore.h"
  32 #include "demangle.h"
  33 #include "valprint.h"
  34 #include "typeprint.h"
  35 #include "language.h"
  36 #include "target.h"
  37 #include "annotate.h"
  38 #include "p-lang.h"
  39 #include "cp-abi.h"
  40 #include "cp-support.h"
  41 \f
  42
  43
  44
  45 /* Print data of type TYPE located at VALADDR (within GDB), which came from
  46    the inferior at address ADDRESS, onto stdio stream STREAM according to
  47    FORMAT (a letter or 0 for natural format).  The data at VALADDR is in
  48    target byte order.
  49
  50    If the data are a string pointer, returns the number of string characters
  51    printed.
  52
  53    If DEREF_REF is nonzero, then dereference references, otherwise just print
  54    them like pointers.
  55
  56    The PRETTY parameter controls prettyprinting.  */
  57
  58
  59 int
  60 pascal_val_print (struct type *type, const gdb_byte *valaddr,
  61                   int embedded_offset, CORE_ADDR address,
  62                   struct ui_file *stream, int format, int deref_ref,
  63                   int recurse, enum val_prettyprint pretty)
  64 {
  65   unsigned int i = 0;   /* Number of characters printed */
  66   unsigned len;
  67   struct type *elttype;
  68   unsigned eltlen;
  69   int length_pos, length_size, string_pos;
  70   int char_size;
  71   LONGEST val;
  72   CORE_ADDR addr;
  73
  74   CHECK_TYPEDEF (type);
  75   switch (TYPE_CODE (type))
  76     {
  77     case TYPE_CODE_ARRAY:
  78       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
  79         {
  80           elttype = check_typedef (TYPE_TARGET_TYPE (type));
  81           eltlen = TYPE_LENGTH (elttype);
  82           len = TYPE_LENGTH (type) / eltlen;
  83           if (prettyprint_arrays)
  84             {
  85               print_spaces_filtered (2 + 2 * recurse, stream);
  86             }
  87           /* For an array of chars, print with string syntax.  */
  88           if (eltlen == 1
  89               && ((TYPE_CODE (elttype) == TYPE_CODE_INT)
  90                || ((current_language->la_language == language_m2)
  91                    && (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
  92               && (format == 0 || format == 's'))
  93             {
  94               /* If requested, look for the first null char and only print
  95                  elements up to it.  */
  96               if (stop_print_at_null)
  97                 {
  98                   unsigned int temp_len;
  99
 100                   /* Look for a NULL char. */
 101                   for (temp_len = 0;
 102                        (valaddr + embedded_offset)[temp_len]
 103                        && temp_len < len && temp_len < print_max;
 104                        temp_len++);
 105                   len = temp_len;
 106                 }
 107
 108               LA_PRINT_STRING (stream, valaddr + embedded_offset, len, 1, 0);
 109               i = len;
 110             }
 111           else
 112             {
 113               fprintf_filtered (stream, "{");
 114               /* If this is a virtual function table, print the 0th
 115                  entry specially, and the rest of the members normally.  */
 116               if (pascal_object_is_vtbl_ptr_type (elttype))
 117                 {
 118                   i = 1;
 119                   fprintf_filtered (stream, "%d vtable entries", len - 1);
 120                 }
 121               else
 122                 {
 123                   i = 0;
 124                 }
 125               val_print_array_elements (type, valaddr + embedded_offset, address, stream,
 126                                      format, deref_ref, recurse, pretty, i);
 127               fprintf_filtered (stream, "}");
 128             }
 129           break;
 130         }
 131       /* Array of unspecified length: treat like pointer to first elt.  */
 132       addr = address;
 133       goto print_unpacked_pointer;
 134
 135     case TYPE_CODE_PTR:
 136       if (format && format != 's')
 137         {
 138           print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
 139           break;
 140         }
 141       if (vtblprint && pascal_object_is_vtbl_ptr_type (type))
 142         {
 143           /* Print the unmangled name if desired.  */
 144           /* Print vtable entry - we only get here if we ARE using
 145              -fvtable_thunks.  (Otherwise, look under TYPE_CODE_STRUCT.) */
 146           /* Extract the address, assume that it is unsigned.  */
 147           print_address_demangle (extract_unsigned_integer (valaddr + embedded_offset, TYPE_LENGTH (type)),
 148                                   stream, demangle);
 149           break;
 150         }
 151       elttype = check_typedef (TYPE_TARGET_TYPE (type));
 152         {
 153           addr = unpack_pointer (type, valaddr + embedded_offset);
 154         print_unpacked_pointer:
 155           elttype = check_typedef (TYPE_TARGET_TYPE (type));
 156
 157           if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 158             {
 159               /* Try to print what function it points to.  */
 160               print_address_demangle (addr, stream, demangle);
 161               /* Return value is irrelevant except for string pointers.  */
 162               return (0);
 163             }
 164
 165           if (addressprint && format != 's')
 166             {
 167               fputs_filtered (paddress (addr), stream);
 168             }
 169
 170           /* For a pointer to char or unsigned char, also print the string
 171              pointed to, unless pointer is null.  */
 172           if (TYPE_LENGTH (elttype) == 1
 173               && TYPE_CODE (elttype) == TYPE_CODE_INT
 174               && (format == 0 || format == 's')
 175               && addr != 0)
 176             {
 177               /* no wide string yet */
 178               i = val_print_string (addr, -1, 1, stream);
 179             }
 180           /* also for pointers to pascal strings */
 181           /* Note: this is Free Pascal specific:
 182              as GDB does not recognize stabs pascal strings
 183              Pascal strings are mapped to records
 184              with lowercase names PM  */
 185           if (is_pascal_string_type (elttype, &length_pos, &length_size,
 186                                      &string_pos, &char_size, NULL)
 187               && addr != 0)
 188             {
 189               ULONGEST string_length;
 190               void *buffer;
 191               buffer = xmalloc (length_size);
 192               read_memory (addr + length_pos, buffer, length_size);
 193               string_length = extract_unsigned_integer (buffer, length_size);
 194               xfree (buffer);
 195               i = val_print_string (addr + string_pos, string_length, char_size, stream);
 196             }
 197           else if (pascal_object_is_vtbl_member (type))
 198             {
 199               /* print vtbl's nicely */
 200               CORE_ADDR vt_address = unpack_pointer (type, valaddr + embedded_offset);
 201
 202               struct minimal_symbol *msymbol =
 203               lookup_minimal_symbol_by_pc (vt_address);
 204               if ((msymbol != NULL)
 205                   && (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
 206                 {
 207                   fputs_filtered (" <", stream);
 208                   fputs_filtered (SYMBOL_PRINT_NAME (msymbol), stream);
 209                   fputs_filtered (">", stream);
 210                 }
 211               if (vt_address && vtblprint)
 212                 {
 213                   struct value *vt_val;
 214                   struct symbol *wsym = (struct symbol *) NULL;
 215                   struct type *wtype;
 216                   struct block *block = (struct block *) NULL;
 217                   int is_this_fld;
 218
 219                   if (msymbol != NULL)
 220                     wsym = lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol), block,
 221                                           VAR_DOMAIN, &is_this_fld, NULL);
 222
 223                   if (wsym)
 224                     {
 225                       wtype = SYMBOL_TYPE (wsym);
 226                     }
 227                   else
 228                     {
 229                       wtype = TYPE_TARGET_TYPE (type);
 230                     }
 231                   vt_val = value_at (wtype, vt_address);
 232                   common_val_print (vt_val, stream, format, deref_ref,
 233                                     recurse + 1, pretty);
 234                   if (pretty)
 235                     {
 236                       fprintf_filtered (stream, "\n");
 237                       print_spaces_filtered (2 + 2 * recurse, stream);
 238                     }
 239                 }
 240             }
 241
 242           /* Return number of characters printed, including the terminating
 243              '\0' if we reached the end.  val_print_string takes care including
 244              the terminating '\0' if necessary.  */
 245           return i;
 246         }
 247       break;
 248
 249     case TYPE_CODE_REF:
 250       elttype = check_typedef (TYPE_TARGET_TYPE (type));
 251       if (addressprint)
 252         {
 253           fprintf_filtered (stream, "@");
 254           /* Extract the address, assume that it is unsigned.  */
 255           fputs_filtered (paddress (
 256             extract_unsigned_integer (valaddr + embedded_offset,
 257                gdbarch_ptr_bit (current_gdbarch) / HOST_CHAR_BIT)), stream);
 258           if (deref_ref)
 259             fputs_filtered (": ", stream);
 260         }
 261       /* De-reference the reference.  */
 262       if (deref_ref)
 263         {
 264           if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 265             {
 266               struct value *deref_val =
 267               value_at
 268               (TYPE_TARGET_TYPE (type),
 269                unpack_pointer (lookup_pointer_type (builtin_type_void),
 270                                valaddr + embedded_offset));
 271               common_val_print (deref_val, stream, format, deref_ref,
 272                                 recurse + 1, pretty);
 273             }
 274           else
 275             fputs_filtered ("???", stream);
 276         }
 277       break;
 278
 279     case TYPE_CODE_UNION:
 280       if (recurse && !unionprint)
 281         {
 282           fprintf_filtered (stream, "{...}");
 283           break;
 284         }
 285       /* Fall through.  */
 286     case TYPE_CODE_STRUCT:
 287       if (vtblprint && pascal_object_is_vtbl_ptr_type (type))
 288         {
 289           /* Print the unmangled name if desired.  */
 290           /* Print vtable entry - we only get here if NOT using
 291              -fvtable_thunks.  (Otherwise, look under TYPE_CODE_PTR.) */
 292           /* Extract the address, assume that it is unsigned.  */
 293           print_address_demangle
 294             (extract_unsigned_integer (valaddr + embedded_offset + TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8,
 295                                        TYPE_LENGTH (TYPE_FIELD_TYPE (type, VTBL_FNADDR_OFFSET))),
 296              stream, demangle);
 297         }
 298       else
 299         {
 300           if (is_pascal_string_type (type, &length_pos, &length_size,
 301                                      &string_pos, &char_size, NULL))
 302             {
 303               len = extract_unsigned_integer (valaddr + embedded_offset + length_pos, length_size);
 304               LA_PRINT_STRING (stream, valaddr + embedded_offset + string_pos, len, char_size, 0);
 305             }
 306           else
 307             pascal_object_print_value_fields (type, valaddr + embedded_offset, address, stream, format,
 308                                               recurse, pretty, NULL, 0);
 309         }
 310       break;
 311
 312     case TYPE_CODE_ENUM:
 313       if (format)
 314         {
 315           print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
 316           break;
 317         }
 318       len = TYPE_NFIELDS (type);
 319       val = unpack_long (type, valaddr + embedded_offset);
 320       for (i = 0; i < len; i++)
 321         {
 322           QUIT;
 323           if (val == TYPE_FIELD_BITPOS (type, i))
 324             {
 325               break;
 326             }
 327         }
 328       if (i < len)
 329         {
 330           fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
 331         }
 332       else
 333         {
 334           print_longest (stream, 'd', 0, val);
 335         }
 336       break;
 337
 338     case TYPE_CODE_FLAGS:
 339       if (format)
 340           print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
 341       else
 342         val_print_type_code_flags (type, valaddr + embedded_offset, stream);
 343       break;
 344
 345     case TYPE_CODE_FUNC:
 346       if (format)
 347         {
 348           print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
 349           break;
 350         }
 351       /* FIXME, we should consider, at least for ANSI C language, eliminating
 352          the distinction made between FUNCs and POINTERs to FUNCs.  */
 353       fprintf_filtered (stream, "{");
 354       type_print (type, "", stream, -1);
 355       fprintf_filtered (stream, "} ");
 356       /* Try to print what function it points to, and its address.  */
 357       print_address_demangle (address, stream, demangle);
 358       break;
 359
 360     case TYPE_CODE_BOOL:
 361       format = format ? format : output_format;
 362       if (format)
 363         print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
 364       else
 365         {
 366           val = unpack_long (type, valaddr + embedded_offset);
 367           if (val == 0)
 368             fputs_filtered ("false", stream);
 369           else if (val == 1)
 370             fputs_filtered ("true", stream);
 371           else
 372             {
 373               fputs_filtered ("true (", stream);
 374               fprintf_filtered (stream, "%ld)", (long int) val);
 375             }
 376         }
 377       break;
 378
 379     case TYPE_CODE_RANGE:
 380       /* FIXME: create_range_type does not set the unsigned bit in a
 381          range type (I think it probably should copy it from the target
 382          type), so we won't print values which are too large to
 383          fit in a signed integer correctly.  */
 384       /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
 385          print with the target type, though, because the size of our type
 386          and the target type might differ).  */
 387       /* FALLTHROUGH */
 388
 389     case TYPE_CODE_INT:
 390       format = format ? format : output_format;
 391       if (format)
 392         {
 393           print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
 394         }
 395       else
 396         {
 397           val_print_type_code_int (type, valaddr + embedded_offset, stream);
 398         }
 399       break;
 400
 401     case TYPE_CODE_CHAR:
 402       format = format ? format : output_format;
 403       if (format)
 404         {
 405           print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
 406         }
 407       else
 408         {
 409           val = unpack_long (type, valaddr + embedded_offset);
 410           if (TYPE_UNSIGNED (type))
 411             fprintf_filtered (stream, "%u", (unsigned int) val);
 412           else
 413             fprintf_filtered (stream, "%d", (int) val);
 414           fputs_filtered (" ", stream);
 415           LA_PRINT_CHAR ((unsigned char) val, stream);
 416         }
 417       break;
 418
 419     case TYPE_CODE_FLT:
 420       if (format)
 421         {
 422           print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
 423         }
 424       else
 425         {
 426           print_floating (valaddr + embedded_offset, type, stream);
 427         }
 428       break;
 429
 430     case TYPE_CODE_BITSTRING:
 431     case TYPE_CODE_SET:
 432       elttype = TYPE_INDEX_TYPE (type);
 433       CHECK_TYPEDEF (elttype);
 434       if (TYPE_STUB (elttype))
 435         {
 436           fprintf_filtered (stream, "<incomplete type>");
 437           gdb_flush (stream);
 438           break;
 439         }
 440       else
 441         {
 442           struct type *range = elttype;
 443           LONGEST low_bound, high_bound;
 444           int i;
 445           int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
 446           int need_comma = 0;
 447
 448           if (is_bitstring)
 449             fputs_filtered ("B'", stream);
 450           else
 451             fputs_filtered ("[", stream);
 452
 453           i = get_discrete_bounds (range, &low_bound, &high_bound);
 454         maybe_bad_bstring:
 455           if (i < 0)
 456             {
 457               fputs_filtered ("<error value>", stream);
 458               goto done;
 459             }
 460
 461           for (i = low_bound; i <= high_bound; i++)
 462             {
 463               int element = value_bit_index (type, valaddr + embedded_offset, i);
 464               if (element < 0)
 465                 {
 466                   i = element;
 467                   goto maybe_bad_bstring;
 468                 }
 469               if (is_bitstring)
 470                 fprintf_filtered (stream, "%d", element);
 471               else if (element)
 472                 {
 473                   if (need_comma)
 474                     fputs_filtered (", ", stream);
 475                   print_type_scalar (range, i, stream);
 476                   need_comma = 1;
 477
 478                   if (i + 1 <= high_bound && value_bit_index (type, valaddr + embedded_offset, ++i))
 479                     {
 480                       int j = i;
 481                       fputs_filtered ("..", stream);
 482                       while (i + 1 <= high_bound
 483                              && value_bit_index (type, valaddr + embedded_offset, ++i))
 484                         j = i;
 485                       print_type_scalar (range, j, stream);
 486                     }
 487                 }
 488             }
 489         done:
 490           if (is_bitstring)
 491             fputs_filtered ("'", stream);
 492           else
 493             fputs_filtered ("]", stream);
 494         }
 495       break;
 496
 497     case TYPE_CODE_VOID:
 498       fprintf_filtered (stream, "void");
 499       break;
 500
 501     case TYPE_CODE_ERROR:
 502       fprintf_filtered (stream, "<error type>");
 503       break;
 504
 505     case TYPE_CODE_UNDEF:
 506       /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
 507          dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
 508          and no complete type for struct foo in that file.  */
 509       fprintf_filtered (stream, "<incomplete type>");
 510       break;
 511
 512     default:
 513       error (_("Invalid pascal type code %d in symbol table."), TYPE_CODE (type));
 514     }
 515   gdb_flush (stream);
 516   return (0);
 517 }
 518 \f
 519 int
 520 pascal_value_print (struct value *val, struct ui_file *stream, int format,
 521                     enum val_prettyprint pretty)
 522 {
 523   struct type *type = value_type (val);
 524
 525   /* If it is a pointer, indicate what it points to.
 526
 527      Print type also if it is a reference.
 528
 529      Object pascal: if it is a member pointer, we will take care
 530      of that when we print it.  */
 531   if (TYPE_CODE (type) == TYPE_CODE_PTR
 532       || TYPE_CODE (type) == TYPE_CODE_REF)
 533     {
 534       /* Hack:  remove (char *) for char strings.  Their
 535          type is indicated by the quoted string anyway. */
 536       if (TYPE_CODE (type) == TYPE_CODE_PTR
 537           && TYPE_NAME (type) == NULL
 538           && TYPE_NAME (TYPE_TARGET_TYPE (type)) != NULL
 539           && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type)), "char") == 0)
 540         {
 541           /* Print nothing */
 542         }
 543       else
 544         {
 545           fprintf_filtered (stream, "(");
 546           type_print (type, "", stream, -1);
 547           fprintf_filtered (stream, ") ");
 548         }
 549     }
 550   return common_val_print (val, stream, format, 1, 0, pretty);
 551 }
 552
 553
 554 /******************************************************************************
 555                     Inserted from cp-valprint
 556 ******************************************************************************/
 557
 558 extern int vtblprint;           /* Controls printing of vtbl's */
 559 extern int objectprint;         /* Controls looking up an object's derived type
 560                                    using what we find in its vtables.  */
 561 static int pascal_static_field_print;   /* Controls printing of static fields. */
 562 static void
 563 show_pascal_static_field_print (struct ui_file *file, int from_tty,
 564                                 struct cmd_list_element *c, const char *value)
 565 {
 566   fprintf_filtered (file, _("Printing of pascal static members is %s.\n"),
 567                     value);
 568 }
 569
 570 static struct obstack dont_print_vb_obstack;
 571 static struct obstack dont_print_statmem_obstack;
 572
 573 static void pascal_object_print_static_field (struct value *,
 574                                               struct ui_file *, int, int,
 575                                               enum val_prettyprint);
 576
 577 static void pascal_object_print_value (struct type *, const gdb_byte *,
 578                                        CORE_ADDR, struct ui_file *,
 579                                        int, int, enum val_prettyprint,
 580                                        struct type **);
 581
 582 /* It was changed to this after 2.4.5.  */
 583 const char pascal_vtbl_ptr_name[] =
 584 {'_', '_', 'v', 't', 'b', 'l', '_', 'p', 't', 'r', '_', 't', 'y', 'p', 'e', 0};
 585
 586 /* Return truth value for assertion that TYPE is of the type
 587    "pointer to virtual function".  */
 588
 589 int
 590 pascal_object_is_vtbl_ptr_type (struct type *type)
 591 {
 592   char *typename = type_name_no_tag (type);
 593
 594   return (typename != NULL
 595           && strcmp (typename, pascal_vtbl_ptr_name) == 0);
 596 }
 597
 598 /* Return truth value for the assertion that TYPE is of the type
 599    "pointer to virtual function table".  */
 600
 601 int
 602 pascal_object_is_vtbl_member (struct type *type)
 603 {
 604   if (TYPE_CODE (type) == TYPE_CODE_PTR)
 605     {
 606       type = TYPE_TARGET_TYPE (type);
 607       if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
 608         {
 609           type = TYPE_TARGET_TYPE (type);
 610           if (TYPE_CODE (type) == TYPE_CODE_STRUCT      /* if not using thunks */
 611               || TYPE_CODE (type) == TYPE_CODE_PTR)     /* if using thunks */
 612             {
 613               /* Virtual functions tables are full of pointers
 614                  to virtual functions. */
 615               return pascal_object_is_vtbl_ptr_type (type);
 616             }
 617         }
 618     }
 619   return 0;
 620 }
 621
 622 /* Mutually recursive subroutines of pascal_object_print_value and
 623    c_val_print to print out a structure's fields:
 624    pascal_object_print_value_fields and pascal_object_print_value.
 625
 626    TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
 627    same meanings as in pascal_object_print_value and c_val_print.
 628
 629    DONT_PRINT is an array of baseclass types that we
 630    should not print, or zero if called from top level.  */
 631
 632 void
 633 pascal_object_print_value_fields (struct type *type, const gdb_byte *valaddr,
 634                                   CORE_ADDR address, struct ui_file *stream,
 635                                   int format, int recurse,
 636                                   enum val_prettyprint pretty,
 637                                   struct type **dont_print_vb,
 638                                   int dont_print_statmem)
 639 {
 640   int i, len, n_baseclasses;
 641   char *last_dont_print = obstack_next_free (&dont_print_statmem_obstack);
 642
 643   CHECK_TYPEDEF (type);
 644
 645   fprintf_filtered (stream, "{");
 646   len = TYPE_NFIELDS (type);
 647   n_baseclasses = TYPE_N_BASECLASSES (type);
 648
 649   /* Print out baseclasses such that we don't print
 650      duplicates of virtual baseclasses.  */
 651   if (n_baseclasses > 0)
 652     pascal_object_print_value (type, valaddr, address, stream,
 653                                format, recurse + 1, pretty, dont_print_vb);
 654
 655   if (!len && n_baseclasses == 1)
 656     fprintf_filtered (stream, "<No data fields>");
 657   else
 658     {
 659       struct obstack tmp_obstack = dont_print_statmem_obstack;
 660       int fields_seen = 0;
 661
 662       if (dont_print_statmem == 0)
 663         {
 664           /* If we're at top level, carve out a completely fresh
 665              chunk of the obstack and use that until this particular
 666              invocation returns.  */
 667           obstack_finish (&dont_print_statmem_obstack);
 668         }
 669
 670       for (i = n_baseclasses; i < len; i++)
 671         {
 672           /* If requested, skip printing of static fields.  */
 673           if (!pascal_static_field_print && TYPE_FIELD_STATIC (type, i))
 674             continue;
 675           if (fields_seen)
 676             fprintf_filtered (stream, ", ");
 677           else if (n_baseclasses > 0)
 678             {
 679               if (pretty)
 680                 {
 681                   fprintf_filtered (stream, "\n");
 682                   print_spaces_filtered (2 + 2 * recurse, stream);
 683                   fputs_filtered ("members of ", stream);
 684                   fputs_filtered (type_name_no_tag (type), stream);
 685                   fputs_filtered (": ", stream);
 686                 }
 687             }
 688           fields_seen = 1;
 689
 690           if (pretty)
 691             {
 692               fprintf_filtered (stream, "\n");
 693               print_spaces_filtered (2 + 2 * recurse, stream);
 694             }
 695           else
 696             {
 697               wrap_here (n_spaces (2 + 2 * recurse));
 698             }
 699           if (inspect_it)
 700             {
 701               if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
 702                 fputs_filtered ("\"( ptr \"", stream);
 703               else
 704                 fputs_filtered ("\"( nodef \"", stream);
 705               if (TYPE_FIELD_STATIC (type, i))
 706                 fputs_filtered ("static ", stream);
 707               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 708                                        language_cplus,
 709                                        DMGL_PARAMS | DMGL_ANSI);
 710               fputs_filtered ("\" \"", stream);
 711               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 712                                        language_cplus,
 713                                        DMGL_PARAMS | DMGL_ANSI);
 714               fputs_filtered ("\") \"", stream);
 715             }
 716           else
 717             {
 718               annotate_field_begin (TYPE_FIELD_TYPE (type, i));
 719
 720               if (TYPE_FIELD_STATIC (type, i))
 721                 fputs_filtered ("static ", stream);
 722               fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 723                                        language_cplus,
 724                                        DMGL_PARAMS | DMGL_ANSI);
 725               annotate_field_name_end ();
 726               fputs_filtered (" = ", stream);
 727               annotate_field_value ();
 728             }
 729
 730           if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
 731             {
 732               struct value *v;
 733
 734               /* Bitfields require special handling, especially due to byte
 735                  order problems.  */
 736               if (TYPE_FIELD_IGNORE (type, i))
 737                 {
 738                   fputs_filtered ("<optimized out or zero length>", stream);
 739                 }
 740               else
 741                 {
 742                   v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 743                                    unpack_field_as_long (type, valaddr, i));
 744
 745                   common_val_print (v, stream, format, 0, recurse + 1, pretty);
 746                 }
 747             }
 748           else
 749             {
 750               if (TYPE_FIELD_IGNORE (type, i))
 751                 {
 752                   fputs_filtered ("<optimized out or zero length>", stream);
 753                 }
 754               else if (TYPE_FIELD_STATIC (type, i))
 755                 {
 756                   /* struct value *v = value_static_field (type, i); v4.17 specific */
 757                   struct value *v;
 758                   v = value_from_longest (TYPE_FIELD_TYPE (type, i),
 759                                    unpack_field_as_long (type, valaddr, i));
 760
 761                   if (v == NULL)
 762                     fputs_filtered ("<optimized out>", stream);
 763                   else
 764                     pascal_object_print_static_field (v, stream, format,
 765                                                       recurse + 1, pretty);
 766                 }
 767               else
 768                 {
 769                   /* val_print (TYPE_FIELD_TYPE (type, i),
 770                      valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
 771                      address + TYPE_FIELD_BITPOS (type, i) / 8, 0,
 772                      stream, format, 0, recurse + 1, pretty); */
 773                   val_print (TYPE_FIELD_TYPE (type, i),
 774                              valaddr, TYPE_FIELD_BITPOS (type, i) / 8,
 775                              address + TYPE_FIELD_BITPOS (type, i) / 8,
 776                              stream, format, 0, recurse + 1, pretty);
 777                 }
 778             }
 779           annotate_field_end ();
 780         }
 781
 782       if (dont_print_statmem == 0)
 783         {
 784           /* Free the space used to deal with the printing
 785              of the members from top level.  */
 786           obstack_free (&dont_print_statmem_obstack, last_dont_print);
 787           dont_print_statmem_obstack = tmp_obstack;
 788         }
 789
 790       if (pretty)
 791         {
 792           fprintf_filtered (stream, "\n");
 793           print_spaces_filtered (2 * recurse, stream);
 794         }
 795     }
 796   fprintf_filtered (stream, "}");
 797 }
 798
 799 /* Special val_print routine to avoid printing multiple copies of virtual
 800    baseclasses.  */
 801
 802 static void
 803 pascal_object_print_value (struct type *type, const gdb_byte *valaddr,
 804                            CORE_ADDR address, struct ui_file *stream,
 805                            int format, int recurse,
 806                            enum val_prettyprint pretty,
 807                            struct type **dont_print_vb)
 808 {
 809   struct type **last_dont_print
 810   = (struct type **) obstack_next_free (&dont_print_vb_obstack);
 811   struct obstack tmp_obstack = dont_print_vb_obstack;
 812   int i, n_baseclasses = TYPE_N_BASECLASSES (type);
 813
 814   if (dont_print_vb == 0)
 815     {
 816       /* If we're at top level, carve out a completely fresh
 817          chunk of the obstack and use that until this particular
 818          invocation returns.  */
 819       /* Bump up the high-water mark.  Now alpha is omega.  */
 820       obstack_finish (&dont_print_vb_obstack);
 821     }
 822
 823   for (i = 0; i < n_baseclasses; i++)
 824     {
 825       int boffset;
 826       struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
 827       char *basename = type_name_no_tag (baseclass);
 828       const gdb_byte *base_valaddr;
 829
 830       if (BASETYPE_VIA_VIRTUAL (type, i))
 831         {
 832           struct type **first_dont_print
 833           = (struct type **) obstack_base (&dont_print_vb_obstack);
 834
 835           int j = (struct type **) obstack_next_free (&dont_print_vb_obstack)
 836           - first_dont_print;
 837
 838           while (--j >= 0)
 839             if (baseclass == first_dont_print[j])
 840               goto flush_it;
 841
 842           obstack_ptr_grow (&dont_print_vb_obstack, baseclass);
 843         }
 844
 845       boffset = baseclass_offset (type, i, valaddr, address);
 846
 847       if (pretty)
 848         {
 849           fprintf_filtered (stream, "\n");
 850           print_spaces_filtered (2 * recurse, stream);
 851         }
 852       fputs_filtered ("<", stream);
 853       /* Not sure what the best notation is in the case where there is no
 854          baseclass name.  */
 855
 856       fputs_filtered (basename ? basename : "", stream);
 857       fputs_filtered ("> = ", stream);
 858
 859       /* The virtual base class pointer might have been clobbered by the
 860          user program. Make sure that it still points to a valid memory
 861          location.  */
 862
 863       if (boffset != -1 && (boffset < 0 || boffset >= TYPE_LENGTH (type)))
 864         {
 865           /* FIXME (alloc): not safe is baseclass is really really big. */
 866           gdb_byte *buf = alloca (TYPE_LENGTH (baseclass));
 867           base_valaddr = buf;
 868           if (target_read_memory (address + boffset, buf,
 869                                   TYPE_LENGTH (baseclass)) != 0)
 870             boffset = -1;
 871         }
 872       else
 873         base_valaddr = valaddr + boffset;
 874
 875       if (boffset == -1)
 876         fprintf_filtered (stream, "<invalid address>");
 877       else
 878         pascal_object_print_value_fields (baseclass, base_valaddr, address + boffset,
 879                                           stream, format, recurse, pretty,
 880                      (struct type **) obstack_base (&dont_print_vb_obstack),
 881                                           0);
 882       fputs_filtered (", ", stream);
 883
 884     flush_it:
 885       ;
 886     }
 887
 888   if (dont_print_vb == 0)
 889     {
 890       /* Free the space used to deal with the printing
 891          of this type from top level.  */
 892       obstack_free (&dont_print_vb_obstack, last_dont_print);
 893       /* Reset watermark so that we can continue protecting
 894          ourselves from whatever we were protecting ourselves.  */
 895       dont_print_vb_obstack = tmp_obstack;
 896     }
 897 }
 898
 899 /* Print value of a static member.
 900    To avoid infinite recursion when printing a class that contains
 901    a static instance of the class, we keep the addresses of all printed
 902    static member classes in an obstack and refuse to print them more
 903    than once.
 904
 905    VAL contains the value to print, STREAM, RECURSE, and PRETTY
 906    have the same meanings as in c_val_print.  */
 907
 908 static void
 909 pascal_object_print_static_field (struct value *val,
 910                                   struct ui_file *stream, int format,
 911                                   int recurse, enum val_prettyprint pretty)
 912 {
 913   struct type *type = value_type (val);
 914
 915   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
 916     {
 917       CORE_ADDR *first_dont_print;
 918       int i;
 919
 920       first_dont_print
 921         = (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack);
 922       i = (CORE_ADDR *) obstack_next_free (&dont_print_statmem_obstack)
 923         - first_dont_print;
 924
 925       while (--i >= 0)
 926         {
 927           if (VALUE_ADDRESS (val) == first_dont_print[i])
 928             {
 929               fputs_filtered ("<same as static member of an already seen type>",
 930                               stream);
 931               return;
 932             }
 933         }
 934
 935       obstack_grow (&dont_print_statmem_obstack, (char *) &VALUE_ADDRESS (val),
 936                     sizeof (CORE_ADDR));
 937
 938       CHECK_TYPEDEF (type);
 939       pascal_object_print_value_fields (type, value_contents (val), VALUE_ADDRESS (val),
 940                                   stream, format, recurse, pretty, NULL, 1);
 941       return;
 942     }
 943   common_val_print (val, stream, format, 0, recurse, pretty);
 944 }
 945
 946 extern initialize_file_ftype _initialize_pascal_valprint; /* -Wmissing-prototypes */
 947
 948 void
 949 _initialize_pascal_valprint (void)
 950 {
 951   add_setshow_boolean_cmd ("pascal_static-members", class_support,
 952                            &pascal_static_field_print, _("\
 953 Set printing of pascal static members."), _("\
 954 Show printing of pascal static members."), NULL,
 955                            NULL,
 956                            show_pascal_static_field_print,
 957                            &setprintlist, &showprintlist);
 958   /* Turn on printing of static fields.  */
 959   pascal_static_field_print = 1;
 960
 961 }