2010-12-31 Michael Snyder <msnyder@vmware.com>

[deliverable/binutils-gdb.git] / gdb / p-valprint.c

/* Support for printing Pascal values for GDB, the GNU debugger.

   Copyright (C) 2000, 2001, 2003, 2005, 2006, 2007, 2008, 2009, 2010
   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This file is derived from c-valprint.c */

#include "defs.h"
#include "gdb_obstack.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "command.h"
#include "gdbcmd.h"
#include "gdbcore.h"
#include "demangle.h"
#include "valprint.h"
#include "typeprint.h"
#include "language.h"
#include "target.h"
#include "annotate.h"
#include "p-lang.h"
#include "cp-abi.h"
#include "cp-support.h"
\f



/* Print data of type TYPE located at VALADDR (within GDB), which came from
   the inferior at address ADDRESS, onto stdio stream STREAM according to
   OPTIONS.  The data at VALADDR is in target byte order.

   If the data are a string pointer, returns the number of string characters
   printed.  */


int
pascal_val_print (struct type *type, const gdb_byte *valaddr,
                  int embedded_offset, CORE_ADDR address,
                  struct ui_file *stream, int recurse,
                  const struct value *original_value,
                  const struct value_print_options *options)
{
  struct gdbarch *gdbarch = get_type_arch (type);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  unsigned int i = 0;   /* Number of characters printed */
  unsigned len;
  LONGEST low_bound, high_bound;
  struct type *elttype;
  unsigned eltlen;
  int length_pos, length_size, string_pos;
  struct type *char_type;
  LONGEST val;
  CORE_ADDR addr;

  CHECK_TYPEDEF (type);
  switch (TYPE_CODE (type))
    {
    case TYPE_CODE_ARRAY:
      if (get_array_bounds (type, &low_bound, &high_bound)) 
        {
          len = high_bound - low_bound + 1;
          elttype = check_typedef (TYPE_TARGET_TYPE (type));
          eltlen = TYPE_LENGTH (elttype);
          if (options->prettyprint_arrays)
            {
              print_spaces_filtered (2 + 2 * recurse, stream);
            }
          /* If 's' format is used, try to print out as string.
             If no format is given, print as string if element type
             is of TYPE_CODE_CHAR and element size is 1,2 or 4.  */
          if (options->format == 's'
              || ((eltlen == 1 || eltlen == 2 || eltlen == 4)
                  && TYPE_CODE (elttype) == TYPE_CODE_CHAR
                  && options->format == 0))
            {
              /* If requested, look for the first null char and only print
                 elements up to it.  */
              if (options->stop_print_at_null)
                {
                  unsigned int temp_len;

                  /* Look for a NULL char. */
                  for (temp_len = 0;
                       extract_unsigned_integer (valaddr + embedded_offset +
                                                 temp_len * eltlen, eltlen,
                                                 byte_order)
                       && temp_len < len && temp_len < options->print_max;
                       temp_len++);
                  len = temp_len;
                }

              LA_PRINT_STRING (stream, TYPE_TARGET_TYPE (type),
                               valaddr + embedded_offset, len, NULL, 0,
                               options);
              i = len;
            }
          else
            {
              fprintf_filtered (stream, "{");
              /* If this is a virtual function table, print the 0th
                 entry specially, and the rest of the members normally.  */
              if (pascal_object_is_vtbl_ptr_type (elttype))
                {
                  i = 1;
                  fprintf_filtered (stream, "%d vtable entries", len - 1);
                }
              else
                {
                  i = 0;
                }
              val_print_array_elements (type, valaddr + embedded_offset, address, stream,
                                        recurse, original_value, options, i);
              fprintf_filtered (stream, "}");
            }
          break;
        }
      /* Array of unspecified length: treat like pointer to first elt.  */
      addr = address;
      goto print_unpacked_pointer;

    case TYPE_CODE_PTR:
      if (options->format && options->format != 's')
        {
          print_scalar_formatted (valaddr + embedded_offset, type,
                                  options, 0, stream);
          break;
        }
      if (options->vtblprint && pascal_object_is_vtbl_ptr_type (type))
        {
          /* Print the unmangled name if desired.  */
          /* Print vtable entry - we only get here if we ARE using
             -fvtable_thunks.  (Otherwise, look under TYPE_CODE_STRUCT.) */
          /* Extract the address, assume that it is unsigned.  */
          addr = extract_unsigned_integer (valaddr + embedded_offset,
                                           TYPE_LENGTH (type), byte_order);
          print_address_demangle (gdbarch, addr, stream, demangle);
          break;
        }
      elttype = check_typedef (TYPE_TARGET_TYPE (type));

      addr = unpack_pointer (type, valaddr + embedded_offset);
    print_unpacked_pointer:
      elttype = check_typedef (TYPE_TARGET_TYPE (type));

      if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
        {
          /* Try to print what function it points to.  */
          print_address_demangle (gdbarch, addr, stream, demangle);
          /* Return value is irrelevant except for string pointers.  */
          return (0);
        }

      if (options->addressprint && options->format != 's')
        {
          fputs_filtered (paddress (gdbarch, addr), stream);
        }

      /* For a pointer to char or unsigned char, also print the string
         pointed to, unless pointer is null.  */
      if (((TYPE_LENGTH (elttype) == 1
           && (TYPE_CODE (elttype) == TYPE_CODE_INT
              || TYPE_CODE (elttype) == TYPE_CODE_CHAR))
          || ((TYPE_LENGTH (elttype) == 2 || TYPE_LENGTH (elttype) == 4)
              && TYPE_CODE (elttype) == TYPE_CODE_CHAR))
          && (options->format == 0 || options->format == 's')
          && addr != 0)
        {
          /* no wide string yet */
          i = val_print_string (elttype, NULL, addr, -1, stream, options);
        }
      /* also for pointers to pascal strings */
      /* Note: this is Free Pascal specific:
         as GDB does not recognize stabs pascal strings
         Pascal strings are mapped to records
         with lowercase names PM  */
      if (is_pascal_string_type (elttype, &length_pos, &length_size,
                                 &string_pos, &char_type, NULL)
          && addr != 0)
        {
          ULONGEST string_length;
          void *buffer;

          buffer = xmalloc (length_size);
          read_memory (addr + length_pos, buffer, length_size);
          string_length = extract_unsigned_integer (buffer, length_size,
                                                    byte_order);
          xfree (buffer);
          i = val_print_string (char_type, NULL,
                                addr + string_pos, string_length,
                                stream, options);
        }
      else if (pascal_object_is_vtbl_member (type))
        {
          /* print vtbl's nicely */
          CORE_ADDR vt_address = unpack_pointer (type, valaddr + embedded_offset);
          struct minimal_symbol *msymbol =
            lookup_minimal_symbol_by_pc (vt_address);

          if ((msymbol != NULL)
              && (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
            {
              fputs_filtered (" <", stream);
              fputs_filtered (SYMBOL_PRINT_NAME (msymbol), stream);
              fputs_filtered (">", stream);
            }
          if (vt_address && options->vtblprint)
            {
              struct value *vt_val;
              struct symbol *wsym = (struct symbol *) NULL;
              struct type *wtype;
              struct block *block = (struct block *) NULL;
              int is_this_fld;

              if (msymbol != NULL)
                wsym = lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol), block,
                                      VAR_DOMAIN, &is_this_fld);

              if (wsym)
                {
                  wtype = SYMBOL_TYPE (wsym);
                }
              else
                {
                  wtype = TYPE_TARGET_TYPE (type);
                }
              vt_val = value_at (wtype, vt_address);
              common_val_print (vt_val, stream, recurse + 1, options,
                                current_language);
              if (options->pretty)
                {
                  fprintf_filtered (stream, "\n");
                  print_spaces_filtered (2 + 2 * recurse, stream);
                }
            }
        }

      /* Return number of characters printed, including the terminating
         '\0' if we reached the end.  val_print_string takes care including
         the terminating '\0' if necessary.  */
      return i;

      break;

    case TYPE_CODE_REF:
      elttype = check_typedef (TYPE_TARGET_TYPE (type));
      if (options->addressprint)
        {
          CORE_ADDR addr
            = extract_typed_address (valaddr + embedded_offset, type);

          fprintf_filtered (stream, "@");
          fputs_filtered (paddress (gdbarch, addr), stream);
          if (options->deref_ref)
            fputs_filtered (": ", stream);
        }
      /* De-reference the reference.  */
      if (options->deref_ref)
        {
          if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
            {
              struct value *deref_val =
                value_at
                (TYPE_TARGET_TYPE (type),
                 unpack_pointer (type, valaddr + embedded_offset));

              common_val_print (deref_val, stream, recurse + 1, options,
                                current_language);
            }
          else
            fputs_filtered ("???", stream);
        }
      break;

    case TYPE_CODE_UNION:
      if (recurse && !options->unionprint)
        {
          fprintf_filtered (stream, "{...}");
          break;
        }
      /* Fall through.  */
    case TYPE_CODE_STRUCT:
      if (options->vtblprint && pascal_object_is_vtbl_ptr_type (type))
        {
          /* Print the unmangled name if desired.  */
          /* Print vtable entry - we only get here if NOT using
             -fvtable_thunks.  (Otherwise, look under TYPE_CODE_PTR.) */
          /* Extract the address, assume that it is unsigned.  */
          print_address_demangle
            (gdbarch,
             extract_unsigned_integer (valaddr + embedded_offset + TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8,
                                       TYPE_LENGTH (TYPE_FIELD_TYPE (type, VTBL_FNADDR_OFFSET)), byte_order),
             stream, demangle);
        }
      else
        {
          if (is_pascal_string_type (type, &length_pos, &length_size,
                                     &string_pos, &char_type, NULL))
            {
              len = extract_unsigned_integer (valaddr + embedded_offset + length_pos, length_size, byte_order);
              LA_PRINT_STRING (stream, char_type, 
                               valaddr + embedded_offset + string_pos,
                               len, NULL, 0, options);
            }
          else
            pascal_object_print_value_fields (type, valaddr + embedded_offset, address, stream,
                                              recurse, original_value, options, NULL, 0);
        }
      break;

    case TYPE_CODE_ENUM:
      if (options->format)
        {
          print_scalar_formatted (valaddr + embedded_offset, type,
                                  options, 0, stream);
          break;
        }
      len = TYPE_NFIELDS (type);
      val = unpack_long (type, valaddr + embedded_offset);
      for (i = 0; i < len; i++)
        {
          QUIT;
          if (val == TYPE_FIELD_BITPOS (type, i))
            {
              break;
            }
        }
      if (i < len)
        {
          fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
        }
      else
        {
          print_longest (stream, 'd', 0, val);
        }
      break;

    case TYPE_CODE_FLAGS:
      if (options->format)
          print_scalar_formatted (valaddr + embedded_offset, type,
                                  options, 0, stream);
      else
        val_print_type_code_flags (type, valaddr + embedded_offset, stream);
      break;

    case TYPE_CODE_FUNC:
      if (options->format)
        {
          print_scalar_formatted (valaddr + embedded_offset, type,
                                  options, 0, stream);
          break;
        }
      /* FIXME, we should consider, at least for ANSI C language, eliminating
         the distinction made between FUNCs and POINTERs to FUNCs.  */
      fprintf_filtered (stream, "{");
      type_print (type, "", stream, -1);
      fprintf_filtered (stream, "} ");
      /* Try to print what function it points to, and its address.  */
      print_address_demangle (gdbarch, address, stream, demangle);
      break;

    case TYPE_CODE_BOOL:
      if (options->format || options->output_format)
        {
          struct value_print_options opts = *options;

          opts.format = (options->format ? options->format
                         : options->output_format);
          print_scalar_formatted (valaddr + embedded_offset, type,
                                  &opts, 0, stream);
        }
      else
        {
          val = unpack_long (type, valaddr + embedded_offset);
          if (val == 0)
            fputs_filtered ("false", stream);
          else if (val == 1)
            fputs_filtered ("true", stream);
          else
            {
              fputs_filtered ("true (", stream);
              fprintf_filtered (stream, "%ld)", (long int) val);
            }
        }
      break;

    case TYPE_CODE_RANGE:
      /* FIXME: create_range_type does not set the unsigned bit in a
         range type (I think it probably should copy it from the target
         type), so we won't print values which are too large to
         fit in a signed integer correctly.  */
      /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
         print with the target type, though, because the size of our type
         and the target type might differ).  */
      /* FALLTHROUGH */

    case TYPE_CODE_INT:
      if (options->format || options->output_format)
        {
          struct value_print_options opts = *options;

          opts.format = (options->format ? options->format
                         : options->output_format);
          print_scalar_formatted (valaddr + embedded_offset, type,
                                  &opts, 0, stream);
        }
      else
        {
          val_print_type_code_int (type, valaddr + embedded_offset, stream);
        }
      break;

    case TYPE_CODE_CHAR:
      if (options->format || options->output_format)
        {
          struct value_print_options opts = *options;

          opts.format = (options->format ? options->format
                         : options->output_format);
          print_scalar_formatted (valaddr + embedded_offset, type,
                                  &opts, 0, stream);
        }
      else
        {
          val = unpack_long (type, valaddr + embedded_offset);
          if (TYPE_UNSIGNED (type))
            fprintf_filtered (stream, "%u", (unsigned int) val);
          else
            fprintf_filtered (stream, "%d", (int) val);
          fputs_filtered (" ", stream);
          LA_PRINT_CHAR ((unsigned char) val, type, stream);
        }
      break;

    case TYPE_CODE_FLT:
      if (options->format)
        {
          print_scalar_formatted (valaddr + embedded_offset, type,
                                  options, 0, stream);
        }
      else
        {
          print_floating (valaddr + embedded_offset, type, stream);
        }
      break;

    case TYPE_CODE_BITSTRING:
    case TYPE_CODE_SET:
      elttype = TYPE_INDEX_TYPE (type);
      CHECK_TYPEDEF (elttype);
      if (TYPE_STUB (elttype))
        {
          fprintf_filtered (stream, "<incomplete type>");
          gdb_flush (stream);
          break;
        }
      else
        {
          struct type *range = elttype;
          LONGEST low_bound, high_bound;
          int i;
          int is_bitstring = TYPE_CODE (type) == TYPE_CODE_BITSTRING;
          int need_comma = 0;

          if (is_bitstring)
            fputs_filtered ("B'", stream);
          else
            fputs_filtered ("[", stream);

          i = get_discrete_bounds (range, &low_bound, &high_bound);
          if (low_bound == 0 && high_bound == -1 && TYPE_LENGTH (type) > 0)
            {
              /* If we know the size of the set type, we can figure out the
              maximum value.  */
              i = 0;
              high_bound = TYPE_LENGTH (type) * TARGET_CHAR_BIT - 1;
              TYPE_HIGH_BOUND (range) = high_bound;
            }
        maybe_bad_bstring:
          if (i < 0)
            {
              fputs_filtered ("<error value>", stream);
              goto done;
            }

          for (i = low_bound; i <= high_bound; i++)
            {
              int element = value_bit_index (type, valaddr + embedded_offset, i);

              if (element < 0)
                {
                  i = element;
                  goto maybe_bad_bstring;
                }
              if (is_bitstring)
                fprintf_filtered (stream, "%d", element);
              else if (element)
                {
                  if (need_comma)
                    fputs_filtered (", ", stream);
                  print_type_scalar (range, i, stream);
                  need_comma = 1;

                  if (i + 1 <= high_bound && value_bit_index (type, valaddr + embedded_offset, ++i))
                    {
                      int j = i;

                      fputs_filtered ("..", stream);
                      while (i + 1 <= high_bound
                             && value_bit_index (type, valaddr + embedded_offset, ++i))
                        j = i;
                      print_type_scalar (range, j, stream);
                    }
                }
            }
        done:
          if (is_bitstring)
            fputs_filtered ("'", stream);
          else
            fputs_filtered ("]", stream);
        }
      break;

    case TYPE_CODE_VOID:
      fprintf_filtered (stream, "void");
      break;

    case TYPE_CODE_ERROR:
      fprintf_filtered (stream, "%s", TYPE_ERROR_NAME (type));
      break;

    case TYPE_CODE_UNDEF:
      /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
         dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
         and no complete type for struct foo in that file.  */
      fprintf_filtered (stream, "<incomplete type>");
      break;

    default:
      error (_("Invalid pascal type code %d in symbol table."), TYPE_CODE (type));
    }
  gdb_flush (stream);
  return (0);
}
\f
int
pascal_value_print (struct value *val, struct ui_file *stream,
                    const struct value_print_options *options)
{
  struct type *type = value_type (val);
  struct value_print_options opts = *options;

  opts.deref_ref = 1;

  /* If it is a pointer, indicate what it points to.

     Print type also if it is a reference.

     Object pascal: if it is a member pointer, we will take care
     of that when we print it.  */
  if (TYPE_CODE (type) == TYPE_CODE_PTR
      || TYPE_CODE (type) == TYPE_CODE_REF)
    {
      /* Hack:  remove (char *) for char strings.  Their
         type is indicated by the quoted string anyway. */
      if (TYPE_CODE (type) == TYPE_CODE_PTR 
          && TYPE_NAME (type) == NULL
          && TYPE_NAME (TYPE_TARGET_TYPE (type)) != NULL
          && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type)), "char") == 0)
        {
          /* Print nothing */
        }
      else
        {
          fprintf_filtered (stream, "(");
          type_print (type, "", stream, -1);
          fprintf_filtered (stream, ") ");
        }
    }
  return common_val_print (val, stream, 0, &opts, current_language);
}


static void
show_pascal_static_field_print (struct ui_file *file, int from_tty,
                                struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("Printing of pascal static members is %s.\n"),
                    value);
}

static struct obstack dont_print_vb_obstack;
static struct obstack dont_print_statmem_obstack;

static void pascal_object_print_static_field (struct value *,
                                              struct ui_file *, int,
                                              const struct value_print_options *);

static void pascal_object_print_value (struct type *, const gdb_byte *,
                                       CORE_ADDR, struct ui_file *, int,
                                       const struct value *,
                                       const struct value_print_options *,
                                       struct type **);

/* It was changed to this after 2.4.5.  */
const char pascal_vtbl_ptr_name[] =
{'_', '_', 'v', 't', 'b', 'l', '_', 'p', 't', 'r', '_', 't', 'y', 'p', 'e', 0};

/* Return truth value for assertion that TYPE is of the type
   "pointer to virtual function".  */

int
pascal_object_is_vtbl_ptr_type (struct type *type)
{
  char *typename = type_name_no_tag (type);

  return (typename != NULL
          && strcmp (typename, pascal_vtbl_ptr_name) == 0);
}

/* Return truth value for the assertion that TYPE is of the type
   "pointer to virtual function table".  */

int
pascal_object_is_vtbl_member (struct type *type)
{
  if (TYPE_CODE (type) == TYPE_CODE_PTR)
    {
      type = TYPE_TARGET_TYPE (type);
      if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
        {
          type = TYPE_TARGET_TYPE (type);
          if (TYPE_CODE (type) == TYPE_CODE_STRUCT      /* if not using thunks */
              || TYPE_CODE (type) == TYPE_CODE_PTR)     /* if using thunks */
            {
              /* Virtual functions tables are full of pointers
                 to virtual functions. */
              return pascal_object_is_vtbl_ptr_type (type);
            }
        }
    }
  return 0;
}

/* Mutually recursive subroutines of pascal_object_print_value and
   c_val_print to print out a structure's fields:
   pascal_object_print_value_fields and pascal_object_print_value.

   TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the
   same meanings as in pascal_object_print_value and c_val_print.

   DONT_PRINT is an array of baseclass types that we
   should not print, or zero if called from top level.  */

void
pascal_object_print_value_fields (struct type *type, const gdb_byte *valaddr,
                                  CORE_ADDR address, struct ui_file *stream,
                                  int recurse,
                                  const struct value *val,
                                  const struct value_print_options *options,
                                  struct type **dont_print_vb,
                                  int dont_print_statmem)
{
  int i, len, n_baseclasses;
  char *last_dont_print = obstack_next_free (&dont_print_statmem_obstack);

  CHECK_TYPEDEF (type);

  fprintf_filtered (stream, "{");
  len = TYPE_NFIELDS (type);
  n_baseclasses = TYPE_N_BASECLASSES (type);

  /* Print out baseclasses such that we don't print
     duplicates of virtual baseclasses.  */
  if (n_baseclasses > 0)
    pascal_object_print_value (type, valaddr, address, stream,
                               recurse + 1, val, options, dont_print_vb);

  if (!len && n_baseclasses == 1)
    fprintf_filtered (stream, "<No data fields>");
  else
    {
      struct obstack tmp_obstack = dont_print_statmem_obstack;
      int fields_seen = 0;

      if (dont_print_statmem == 0)
        {
          /* If we're at top level, carve out a completely fresh
             chunk of the obstack and use that until this particular
             invocation returns.  */
          obstack_finish (&dont_print_statmem_obstack);
        }

      for (i = n_baseclasses; i < len; i++)
        {
          /* If requested, skip printing of static fields.  */
          if (!options->pascal_static_field_print
              && field_is_static (&TYPE_FIELD (type, i)))
            continue;
          if (fields_seen)
            fprintf_filtered (stream, ", ");
          else if (n_baseclasses > 0)
            {
              if (options->pretty)
                {
                  fprintf_filtered (stream, "\n");
                  print_spaces_filtered (2 + 2 * recurse, stream);
                  fputs_filtered ("members of ", stream);
                  fputs_filtered (type_name_no_tag (type), stream);
                  fputs_filtered (": ", stream);
                }
            }
          fields_seen = 1;

          if (options->pretty)
            {
              fprintf_filtered (stream, "\n");
              print_spaces_filtered (2 + 2 * recurse, stream);
            }
          else
            {
              wrap_here (n_spaces (2 + 2 * recurse));
            }
          if (options->inspect_it)
            {
              if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
                fputs_filtered ("\"( ptr \"", stream);
              else
                fputs_filtered ("\"( nodef \"", stream);
              if (field_is_static (&TYPE_FIELD (type, i)))
                fputs_filtered ("static ", stream);
              fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
                                       language_cplus,
                                       DMGL_PARAMS | DMGL_ANSI);
              fputs_filtered ("\" \"", stream);
              fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
                                       language_cplus,
                                       DMGL_PARAMS | DMGL_ANSI);
              fputs_filtered ("\") \"", stream);
            }
          else
            {
              annotate_field_begin (TYPE_FIELD_TYPE (type, i));

              if (field_is_static (&TYPE_FIELD (type, i)))
                fputs_filtered ("static ", stream);
              fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
                                       language_cplus,
                                       DMGL_PARAMS | DMGL_ANSI);
              annotate_field_name_end ();
              fputs_filtered (" = ", stream);
              annotate_field_value ();
            }

          if (!field_is_static (&TYPE_FIELD (type, i))
              && TYPE_FIELD_PACKED (type, i))
            {
              struct value *v;

              /* Bitfields require special handling, especially due to byte
                 order problems.  */
              if (TYPE_FIELD_IGNORE (type, i))
                {
                  fputs_filtered ("<optimized out or zero length>", stream);
                }
              else if (value_bits_synthetic_pointer (val,
                                                     TYPE_FIELD_BITPOS (type,
                                                                        i),
                                                     TYPE_FIELD_BITSIZE (type,
                                                                         i)))
                {
                  fputs_filtered (_("<synthetic pointer>"), stream);
                }
              else if (!value_bits_valid (val, TYPE_FIELD_BITPOS (type, i),
                                          TYPE_FIELD_BITSIZE (type, i)))
                {
                  fputs_filtered (_("<value optimized out>"), stream);
                }
              else
                {
                  struct value_print_options opts = *options;

                  v = value_from_longest (TYPE_FIELD_TYPE (type, i),
                                   unpack_field_as_long (type, valaddr, i));

                  opts.deref_ref = 0;
                  common_val_print (v, stream, recurse + 1, &opts,
                                    current_language);
                }
            }
          else
            {
              if (TYPE_FIELD_IGNORE (type, i))
                {
                  fputs_filtered ("<optimized out or zero length>", stream);
                }
              else if (field_is_static (&TYPE_FIELD (type, i)))
                {
                  /* struct value *v = value_static_field (type, i); v4.17 specific */
                  struct value *v;

                  v = value_from_longest (TYPE_FIELD_TYPE (type, i),
                                   unpack_field_as_long (type, valaddr, i));

                  if (v == NULL)
                    fputs_filtered ("<optimized out>", stream);
                  else
                    pascal_object_print_static_field (v, stream, recurse + 1,
                                                      options);
                }
              else
                {
                  struct value_print_options opts = *options;

                  opts.deref_ref = 0;
                  /* val_print (TYPE_FIELD_TYPE (type, i),
                     valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
                     address + TYPE_FIELD_BITPOS (type, i) / 8, 0,
                     stream, format, 0, recurse + 1, pretty); */
                  val_print (TYPE_FIELD_TYPE (type, i),
                             valaddr, TYPE_FIELD_BITPOS (type, i) / 8,
                             address + TYPE_FIELD_BITPOS (type, i) / 8,
                             stream, recurse + 1, val, &opts,
                             current_language);
                }
            }
          annotate_field_end ();
        }

      if (dont_print_statmem == 0)
        {
          /* Free the space used to deal with the printing
             of the members from top level.  */
          obstack_free (&dont_print_statmem_obstack, last_dont_print);
          dont_print_statmem_obstack = tmp_obstack;
        }

      if (options->pretty)
        {
          fprintf_filtered (stream, "\n");
          print_spaces_filtered (2 * recurse, stream);
        }
    }
  fprintf_filtered (stream, "}");
}

/* Special val_print routine to avoid printing multiple copies of virtual
   baseclasses.  */

static void
pascal_object_print_value (struct type *type, const gdb_byte *valaddr,
                           CORE_ADDR address, struct ui_file *stream,
                           int recurse,
                           const struct value *val,
                           const struct value_print_options *options,
                           struct type **dont_print_vb)
{
  struct type **last_dont_print
    = (struct type **) obstack_next_free (&dont_print_vb_obstack);
  struct obstack tmp_obstack = dont_print_vb_obstack;
  int i, n_baseclasses = TYPE_N_BASECLASSES (type);

  if (dont_print_vb == 0)
    {
      /* If we're at top level, carve out a completely fresh
         chunk of the obstack and use that until this particular
         invocation returns.  */
      /* Bump up the high-water mark.  Now alpha is omega.  */
      obstack_finish (&dont_print_vb_obstack);
    }

  for (i = 0; i < n_baseclasses; i++)
    {
      int boffset;
      struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
      char *basename = type_name_no_tag (baseclass);
      const gdb_byte *base_valaddr;

      if (BASETYPE_VIA_VIRTUAL (type, i))
        {
          struct type **first_dont_print
            = (struct type **) obstack_base (&dont_print_vb_obstack);

          int j = (struct type **) obstack_next_free (&dont_print_vb_obstack)
            - first_dont_print;

          while (--j >= 0)
            if (baseclass == first_dont_print[j])
              goto flush_it;

          obstack_ptr_grow (&dont_print_vb_obstack, baseclass);
        }

      boffset = baseclass_offset (type, i, valaddr, address);

      if (options->pretty)
        {
          fprintf_filtered (stream, "\n");
          print_spaces_filtered (2 * recurse, stream);
        }
      fputs_filtered ("<", stream);
      /* Not sure what the best notation is in the case where there is no
         baseclass name.  */

      fputs_filtered (basename ? basename : "", stream);
      fputs_filtered ("> = ", stream);

      /* The virtual base class pointer might have been clobbered by the
         user program. Make sure that it still points to a valid memory
         location.  */

      if (boffset != -1 && (boffset < 0 || boffset >= TYPE_LENGTH (type)))
        {
          /* FIXME (alloc): not safe is baseclass is really really big. */
          gdb_byte *buf = alloca (TYPE_LENGTH (baseclass));

          base_valaddr = buf;
          if (target_read_memory (address + boffset, buf,
                                  TYPE_LENGTH (baseclass)) != 0)
            boffset = -1;
        }
      else
        base_valaddr = valaddr + boffset;

      if (boffset == -1)
        fprintf_filtered (stream, "<invalid address>");
      else
        pascal_object_print_value_fields (baseclass, base_valaddr, address + boffset,
                                          stream, recurse, val, options,
                     (struct type **) obstack_base (&dont_print_vb_obstack),
                                          0);
      fputs_filtered (", ", stream);

    flush_it:
      ;
    }

  if (dont_print_vb == 0)
    {
      /* Free the space used to deal with the printing
         of this type from top level.  */
      obstack_free (&dont_print_vb_obstack, last_dont_print);
      /* Reset watermark so that we can continue protecting
         ourselves from whatever we were protecting ourselves.  */
      dont_print_vb_obstack = tmp_obstack;
    }
}

/* Print value of a static member.
   To avoid infinite recursion when printing a class that contains
   a static instance of the class, we keep the addresses of all printed
   static member classes in an obstack and refuse to print them more
   than once.

   VAL contains the value to print, STREAM, RECURSE, and OPTIONS
   have the same meanings as in c_val_print.  */

static void
pascal_object_print_static_field (struct value *val,
                                  struct ui_file *stream,
                                  int recurse,
                                  const struct value_print_options *options)
{
  struct type *type = value_type (val);
  struct value_print_options opts;

  if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
    {
      CORE_ADDR *first_dont_print, addr;
      int i;

      first_dont_print
        = (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack);
      i = (CORE_ADDR *) obstack_next_free (&dont_print_statmem_obstack)
        - first_dont_print;

      while (--i >= 0)
        {
          if (value_address (val) == first_dont_print[i])
            {
              fputs_filtered ("<same as static member of an already seen type>",
                              stream);
              return;
            }
        }

      addr = value_address (val);
      obstack_grow (&dont_print_statmem_obstack, (char *) &addr,
                    sizeof (CORE_ADDR));

      CHECK_TYPEDEF (type);
      pascal_object_print_value_fields (type, value_contents (val), addr,
                                        stream, recurse, NULL, options,
                                        NULL, 1);
      return;
    }

  opts = *options;
  opts.deref_ref = 0;
  common_val_print (val, stream, recurse, &opts, current_language);
}

extern initialize_file_ftype _initialize_pascal_valprint; /* -Wmissing-prototypes */

void
_initialize_pascal_valprint (void)
{
  add_setshow_boolean_cmd ("pascal_static-members", class_support,
                           &user_print_options.pascal_static_field_print, _("\
Set printing of pascal static members."), _("\
Show printing of pascal static members."), NULL,
                           NULL,
                           show_pascal_static_field_print,
                           &setprintlist, &showprintlist);
}