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[gdb.git] / gdb / ada-valprint.c

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

   Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1997, 2001, 2002,
   2003, 2004, 2005, 2006, 2007, 2008 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/>.  */

#include <ctype.h>
#include "defs.h"
#include "gdb_string.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "demangle.h"
#include "valprint.h"
#include "language.h"
#include "annotate.h"
#include "ada-lang.h"
#include "c-lang.h"
#include "infcall.h"
#include "exceptions.h"

/* Encapsulates arguments to ada_val_print.  */
struct ada_val_print_args
{
  struct type *type;
  const gdb_byte *valaddr0;
  int embedded_offset;
  CORE_ADDR address;
  struct ui_file *stream;
  int format;
  int deref_ref;
  int recurse;
  enum val_prettyprint pretty;
};

static void print_record (struct type *, const gdb_byte *, struct ui_file *,
                          int, int, enum val_prettyprint);

static int print_field_values (struct type *, const gdb_byte *,
                               struct ui_file *, int, int,
                               enum val_prettyprint, int, struct type *,
                               const gdb_byte *);

static void adjust_type_signedness (struct type *);

static int ada_val_print_stub (void *args0);

static int ada_val_print_1 (struct type *, const gdb_byte *, int, CORE_ADDR,
                            struct ui_file *, int, int, int,
                            enum val_prettyprint);
\f

/* Make TYPE unsigned if its range of values includes no negatives.  */
static void
adjust_type_signedness (struct type *type)
{
  if (type != NULL && TYPE_CODE (type) == TYPE_CODE_RANGE
      && TYPE_LOW_BOUND (type) >= 0)
    TYPE_FLAGS (type) |= TYPE_FLAG_UNSIGNED;
}

/* Assuming TYPE is a simple, non-empty array type, prints its lower bound 
   on STREAM, if non-standard (i.e., other than 1 for numbers, other
   than lower bound of index type for enumerated type).  Returns 1 
   if something printed, otherwise 0.  */

static int
print_optional_low_bound (struct ui_file *stream, struct type *type)
{
  struct type *index_type;
  long low_bound;

  if (print_array_indexes_p ())
    return 0;

  if (!get_array_low_bound (type, &low_bound))
    return 0;

  index_type = TYPE_INDEX_TYPE (type);

  if (TYPE_CODE (index_type) == TYPE_CODE_RANGE)
    {
      /* We need to know what the base type is, in order to do the
         appropriate check below.  Otherwise, if this is a subrange
         of an enumerated type, where the underlying value of the
         first element is typically 0, we might test the low bound
         against the wrong value.  */
      index_type = TYPE_TARGET_TYPE (index_type);
    }

  switch (TYPE_CODE (index_type))
    {
    case TYPE_CODE_ENUM:
      if (low_bound == TYPE_FIELD_BITPOS (index_type, 0))
        return 0;
      break;
    case TYPE_CODE_UNDEF:
      index_type = builtin_type_long;
      /* FALL THROUGH */
    default:
      if (low_bound == 1)
        return 0;
      break;
    }

  ada_print_scalar (index_type, (LONGEST) low_bound, stream);
  fprintf_filtered (stream, " => ");
  return 1;
}

/*  Version of val_print_array_elements for GNAT-style packed arrays.
    Prints elements of packed array of type TYPE at bit offset
    BITOFFSET from VALADDR on STREAM.  Formats according to FORMAT and
    separates with commas.  RECURSE is the recursion (nesting) level.
    If PRETTY, uses "prettier" format.  TYPE must have been decoded (as
    by ada_coerce_to_simple_array).  */

static void
val_print_packed_array_elements (struct type *type, const gdb_byte *valaddr,
                                 int bitoffset, struct ui_file *stream,
                                 int format, int recurse,
                                 enum val_prettyprint pretty)
{
  unsigned int i;
  unsigned int things_printed = 0;
  unsigned len;
  struct type *elttype, *index_type;
  unsigned eltlen;
  unsigned long bitsize = TYPE_FIELD_BITSIZE (type, 0);
  struct value *mark = value_mark ();
  LONGEST low = 0;

  elttype = TYPE_TARGET_TYPE (type);
  eltlen = TYPE_LENGTH (check_typedef (elttype));
  index_type = TYPE_INDEX_TYPE (type);

  {
    LONGEST high;
    if (get_discrete_bounds (TYPE_FIELD_TYPE (type, 0), &low, &high) < 0)
      len = 1;
    else
      len = high - low + 1;
  }

  i = 0;
  annotate_array_section_begin (i, elttype);

  while (i < len && things_printed < print_max)
    {
      struct value *v0, *v1;
      int i0;

      if (i != 0)
        {
          if (prettyprint_arrays)
            {
              fprintf_filtered (stream, ",\n");
              print_spaces_filtered (2 + 2 * recurse, stream);
            }
          else
            {
              fprintf_filtered (stream, ", ");
            }
        }
      wrap_here (n_spaces (2 + 2 * recurse));
      maybe_print_array_index (index_type, i + low, stream, format, pretty);

      i0 = i;
      v0 = ada_value_primitive_packed_val (NULL, valaddr,
                                           (i0 * bitsize) / HOST_CHAR_BIT,
                                           (i0 * bitsize) % HOST_CHAR_BIT,
                                           bitsize, elttype);
      while (1)
        {
          i += 1;
          if (i >= len)
            break;
          v1 = ada_value_primitive_packed_val (NULL, valaddr,
                                               (i * bitsize) / HOST_CHAR_BIT,
                                               (i * bitsize) % HOST_CHAR_BIT,
                                               bitsize, elttype);
          if (memcmp (value_contents (v0), value_contents (v1), eltlen) != 0)
            break;
        }

      if (i - i0 > repeat_count_threshold)
        {
          val_print (elttype, value_contents (v0), 0, 0, stream, format,
                     0, recurse + 1, pretty);
          annotate_elt_rep (i - i0);
          fprintf_filtered (stream, _(" <repeats %u times>"), i - i0);
          annotate_elt_rep_end ();

        }
      else
        {
          int j;
          for (j = i0; j < i; j += 1)
            {
              if (j > i0)
                {
                  if (prettyprint_arrays)
                    {
                      fprintf_filtered (stream, ",\n");
                      print_spaces_filtered (2 + 2 * recurse, stream);
                    }
                  else
                    {
                      fprintf_filtered (stream, ", ");
                    }
                  wrap_here (n_spaces (2 + 2 * recurse));
                  maybe_print_array_index (index_type, j + low,
                                           stream, format, pretty);
                }
              val_print (elttype, value_contents (v0), 0, 0, stream, format,
                         0, recurse + 1, pretty);
              annotate_elt ();
            }
        }
      things_printed += i - i0;
    }
  annotate_array_section_end ();
  if (i < len)
    {
      fprintf_filtered (stream, "...");
    }

  value_free_to_mark (mark);
}

static struct type *
printable_val_type (struct type *type, const gdb_byte *valaddr)
{
  return ada_to_fixed_type (ada_aligned_type (type), valaddr, 0, NULL, 1);
}

/* Print the character C on STREAM as part of the contents of a literal
   string whose delimiter is QUOTER.  TYPE_LEN is the length in bytes
   (1 or 2) of the character.  */

void
ada_emit_char (int c, struct ui_file *stream, int quoter, int type_len)
{
  if (type_len != 2)
    type_len = 1;

  c &= (1 << (type_len * TARGET_CHAR_BIT)) - 1;

  if (isascii (c) && isprint (c))
    {
      if (c == quoter && c == '"')
        fprintf_filtered (stream, "\"\"");
      else
        fprintf_filtered (stream, "%c", c);
    }
  else
    fprintf_filtered (stream, "[\"%0*x\"]", type_len * 2, c);
}

/* Character #I of STRING, given that TYPE_LEN is the size in bytes (1
   or 2) of a character.  */

static int
char_at (const gdb_byte *string, int i, int type_len)
{
  if (type_len == 1)
    return string[i];
  else
    return (int) extract_unsigned_integer (string + 2 * i, 2);
}

/* Wrapper around memcpy to make it legal argument to ui_file_put */
static void
ui_memcpy (void *dest, const char *buffer, long len)
{
  memcpy (dest, buffer, (size_t) len);
  ((char *) dest)[len] = '\0';
}

/* Print a floating-point value of type TYPE, pointed to in GDB by
   VALADDR, on STREAM.  Use Ada formatting conventions: there must be
   a decimal point, and at least one digit before and after the
   point.  We use GNAT format for NaNs and infinities.  */
static void
ada_print_floating (const gdb_byte *valaddr, struct type *type,
                    struct ui_file *stream)
{
  char buffer[64];
  char *s, *result;
  int len;
  struct ui_file *tmp_stream = mem_fileopen ();
  struct cleanup *cleanups = make_cleanup_ui_file_delete (tmp_stream);

  print_floating (valaddr, type, tmp_stream);
  ui_file_put (tmp_stream, ui_memcpy, buffer);
  do_cleanups (cleanups);

  result = buffer;
  len = strlen (result);

  /* Modify for Ada rules.  */
  
  s = strstr (result, "inf");
  if (s == NULL)
    s = strstr (result, "Inf");
  if (s == NULL)
    s = strstr (result, "INF");
  if (s != NULL)
    strcpy (s, "Inf");

  if (s == NULL)
    {
      s = strstr (result, "nan");
      if (s == NULL)
        s = strstr (result, "NaN");
      if (s == NULL)
        s = strstr (result, "Nan");
      if (s != NULL)
        {
          s[0] = s[2] = 'N';
          if (result[0] == '-')
            result += 1;
        }
    }

  if (s == NULL && strchr (result, '.') == NULL)
    {
      s = strchr (result, 'e');
      if (s == NULL)
        fprintf_filtered (stream, "%s.0", result);
      else
        fprintf_filtered (stream, "%.*s.0%s", (int) (s-result), result, s);
      return;
    }
  fprintf_filtered (stream, "%s", result);
}

void
ada_printchar (int c, struct ui_file *stream)
{
  fputs_filtered ("'", stream);
  ada_emit_char (c, stream, '\'', 1);
  fputs_filtered ("'", stream);
}

/* [From print_type_scalar in typeprint.c].   Print VAL on STREAM in a
   form appropriate for TYPE.  */

void
ada_print_scalar (struct type *type, LONGEST val, struct ui_file *stream)
{
  unsigned int i;
  unsigned len;

  type = ada_check_typedef (type);

  switch (TYPE_CODE (type))
    {

    case TYPE_CODE_ENUM:
      len = TYPE_NFIELDS (type);
      for (i = 0; i < len; i++)
        {
          if (TYPE_FIELD_BITPOS (type, i) == val)
            {
              break;
            }
        }
      if (i < len)
        {
          fputs_filtered (ada_enum_name (TYPE_FIELD_NAME (type, i)), stream);
        }
      else
        {
          print_longest (stream, 'd', 0, val);
        }
      break;

    case TYPE_CODE_INT:
      print_longest (stream, TYPE_UNSIGNED (type) ? 'u' : 'd', 0, val);
      break;

    case TYPE_CODE_CHAR:
      LA_PRINT_CHAR ((unsigned char) val, stream);
      break;

    case TYPE_CODE_BOOL:
      fprintf_filtered (stream, val ? "true" : "false");
      break;

    case TYPE_CODE_RANGE:
      ada_print_scalar (TYPE_TARGET_TYPE (type), val, stream);
      return;

    case TYPE_CODE_UNDEF:
    case TYPE_CODE_PTR:
    case TYPE_CODE_ARRAY:
    case TYPE_CODE_STRUCT:
    case TYPE_CODE_UNION:
    case TYPE_CODE_FUNC:
    case TYPE_CODE_FLT:
    case TYPE_CODE_VOID:
    case TYPE_CODE_SET:
    case TYPE_CODE_STRING:
    case TYPE_CODE_ERROR:
    case TYPE_CODE_MEMBERPTR:
    case TYPE_CODE_METHODPTR:
    case TYPE_CODE_METHOD:
    case TYPE_CODE_REF:
      warning (_("internal error: unhandled type in ada_print_scalar"));
      break;

    default:
      error (_("Invalid type code in symbol table."));
    }
  gdb_flush (stream);
}

/* Print the character string STRING, printing at most LENGTH characters.
   Printing stops early if the number hits print_max; repeat counts
   are printed as appropriate.  Print ellipses at the end if we
   had to stop before printing LENGTH characters, or if
   FORCE_ELLIPSES.   TYPE_LEN is the length (1 or 2) of the character type.
 */

static void
printstr (struct ui_file *stream, const gdb_byte *string,
          unsigned int length, int force_ellipses, int type_len)
{
  unsigned int i;
  unsigned int things_printed = 0;
  int in_quotes = 0;
  int need_comma = 0;

  if (length == 0)
    {
      fputs_filtered ("\"\"", stream);
      return;
    }

  for (i = 0; i < length && things_printed < print_max; i += 1)
    {
      /* Position of the character we are examining
         to see whether it is repeated.  */
      unsigned int rep1;
      /* Number of repetitions we have detected so far.  */
      unsigned int reps;

      QUIT;

      if (need_comma)
        {
          fputs_filtered (", ", stream);
          need_comma = 0;
        }

      rep1 = i + 1;
      reps = 1;
      while (rep1 < length
             && char_at (string, rep1, type_len) == char_at (string, i,
                                                             type_len))
        {
          rep1 += 1;
          reps += 1;
        }

      if (reps > repeat_count_threshold)
        {
          if (in_quotes)
            {
              if (inspect_it)
                fputs_filtered ("\\\", ", stream);
              else
                fputs_filtered ("\", ", stream);
              in_quotes = 0;
            }
          fputs_filtered ("'", stream);
          ada_emit_char (char_at (string, i, type_len), stream, '\'',
                         type_len);
          fputs_filtered ("'", stream);
          fprintf_filtered (stream, _(" <repeats %u times>"), reps);
          i = rep1 - 1;
          things_printed += repeat_count_threshold;
          need_comma = 1;
        }
      else
        {
          if (!in_quotes)
            {
              if (inspect_it)
                fputs_filtered ("\\\"", stream);
              else
                fputs_filtered ("\"", stream);
              in_quotes = 1;
            }
          ada_emit_char (char_at (string, i, type_len), stream, '"',
                         type_len);
          things_printed += 1;
        }
    }

  /* Terminate the quotes if necessary.  */
  if (in_quotes)
    {
      if (inspect_it)
        fputs_filtered ("\\\"", stream);
      else
        fputs_filtered ("\"", stream);
    }

  if (force_ellipses || i < length)
    fputs_filtered ("...", stream);
}

void
ada_printstr (struct ui_file *stream, const gdb_byte *string,
              unsigned int length, int width, int force_ellipses)
{
  printstr (stream, string, length, force_ellipses, width);
}


/* Print data of type TYPE located at VALADDR (within GDB), which came from
   the inferior at address ADDRESS, onto stdio stream STREAM according to
   FORMAT (a letter as for the printf % codes or 0 for natural format).
   The data at VALADDR is in target byte order.

   If the data is printed as a string, returns the number of string characters
   printed.

   If DEREF_REF is nonzero, then dereference references, otherwise just print
   them like pointers.

   RECURSE indicates the amount of indentation to supply before
   continuation lines; this amount is roughly twice the value of RECURSE.

   When PRETTY is non-zero, prints record fields on separate lines.
   (For some reason, the current version of gdb instead uses a global
   variable---prettyprint_arrays--- to causes a similar effect on
   arrays.)  */

int
ada_val_print (struct type *type, const gdb_byte *valaddr0,
               int embedded_offset, CORE_ADDR address,
               struct ui_file *stream, int format, int deref_ref,
               int recurse, enum val_prettyprint pretty)
{
  struct ada_val_print_args args;
  args.type = type;
  args.valaddr0 = valaddr0;
  args.embedded_offset = embedded_offset;
  args.address = address;
  args.stream = stream;
  args.format = format;
  args.deref_ref = deref_ref;
  args.recurse = recurse;
  args.pretty = pretty;

  return catch_errors (ada_val_print_stub, &args, NULL, RETURN_MASK_ALL);
}

/* Helper for ada_val_print; used as argument to catch_errors to
   unmarshal the arguments to ada_val_print_1, which does the work.  */
static int
ada_val_print_stub (void *args0)
{
  struct ada_val_print_args *argsp = (struct ada_val_print_args *) args0;
  return ada_val_print_1 (argsp->type, argsp->valaddr0,
                          argsp->embedded_offset, argsp->address,
                          argsp->stream, argsp->format, argsp->deref_ref,
                          argsp->recurse, argsp->pretty);
}

/* See the comment on ada_val_print.  This function differs in that it
 * does not catch evaluation errors (leaving that to ada_val_print).  */

static int
ada_val_print_1 (struct type *type, const gdb_byte *valaddr0,
                 int embedded_offset, CORE_ADDR address,
                 struct ui_file *stream, int format,
                 int deref_ref, int recurse, enum val_prettyprint pretty)
{
  unsigned int len;
  int i;
  struct type *elttype;
  unsigned int eltlen;
  LONGEST val;
  const gdb_byte *valaddr = valaddr0 + embedded_offset;

  type = ada_check_typedef (type);

  if (ada_is_array_descriptor_type (type) || ada_is_packed_array_type (type))
    {
      int retn;
      struct value *mark = value_mark ();
      struct value *val;
      val = value_from_contents_and_address (type, valaddr, address);
      val = ada_coerce_to_simple_array_ptr (val);
      if (val == NULL)
        {
          fprintf_filtered (stream, "(null)");
          retn = 0;
        }
      else
        retn = ada_val_print_1 (value_type (val), value_contents (val), 0,
                                VALUE_ADDRESS (val), stream, format,
                                deref_ref, recurse, pretty);
      value_free_to_mark (mark);
      return retn;
    }

  valaddr = ada_aligned_value_addr (type, valaddr);
  embedded_offset -= valaddr - valaddr0 - embedded_offset;
  type = printable_val_type (type, valaddr);

  switch (TYPE_CODE (type))
    {
    default:
      return c_val_print (type, valaddr0, embedded_offset, address, stream,
                          format, deref_ref, recurse, pretty);

    case TYPE_CODE_PTR:
      {
        int ret = c_val_print (type, valaddr0, embedded_offset, address, 
                               stream, format, deref_ref, recurse, pretty);
        if (ada_is_tag_type (type))
          {
            struct value *val = 
              value_from_contents_and_address (type, valaddr, address);
            const char *name = ada_tag_name (val);
            if (name != NULL) 
              fprintf_filtered (stream, " (%s)", name);
            return 0;
        }
        return ret;
      }

    case TYPE_CODE_INT:
    case TYPE_CODE_RANGE:
      if (ada_is_fixed_point_type (type))
        {
          LONGEST v = unpack_long (type, valaddr);
          int len = TYPE_LENGTH (type);

          fprintf_filtered (stream, len < 4 ? "%.11g" : "%.17g",
                            (double) ada_fixed_to_float (type, v));
          return 0;
        }
      else if (ada_is_vax_floating_type (type))
        {
          struct value *val =
            value_from_contents_and_address (type, valaddr, address);
          struct value *func = ada_vax_float_print_function (type);
          if (func != 0)
            {
              static struct type *parray_of_char = NULL;
              struct value *printable_val;

              if (parray_of_char == NULL)
                parray_of_char =
                  make_pointer_type
                  (create_array_type
                   (NULL, builtin_type_char,
                    create_range_type (NULL, builtin_type_int, 0, 32)), NULL);

              printable_val =
                value_ind (value_cast (parray_of_char,
                                       call_function_by_hand (func, 1,
                                                              &val)));

              fprintf_filtered (stream, "%s", value_contents (printable_val));
              return 0;
            }
          /* No special printing function.  Do as best we can.  */
        }
      else if (TYPE_CODE (type) == TYPE_CODE_RANGE)
        {
          struct type *target_type = TYPE_TARGET_TYPE (type);
          if (TYPE_LENGTH (type) != TYPE_LENGTH (target_type))
            {
              /* Obscure case of range type that has different length from
                 its base type.  Perform a conversion, or we will get a
                 nonsense value.  Actually, we could use the same
                 code regardless of lengths; I'm just avoiding a cast.  */
              struct value *v = value_cast (target_type,
                                            value_from_contents_and_address
                                            (type, valaddr, 0));
              return ada_val_print_1 (target_type, value_contents (v), 0, 0,
                                      stream, format, 0, recurse + 1, pretty);
            }
          else
            return ada_val_print_1 (TYPE_TARGET_TYPE (type),
                                    valaddr0, embedded_offset,
                                    address, stream, format, deref_ref,
                                    recurse, pretty);
        }
      else
        {
          format = format ? format : output_format;
          if (format)
            {
              print_scalar_formatted (valaddr, type, format, 0, stream);
            }
          else if (ada_is_system_address_type (type))
            {
              /* FIXME: We want to print System.Address variables using
                 the same format as for any access type.  But for some
                 reason GNAT encodes the System.Address type as an int,
                 so we have to work-around this deficiency by handling
                 System.Address values as a special case.  */
              fprintf_filtered (stream, "(");
              type_print (type, "", stream, -1);
              fprintf_filtered (stream, ") ");
              fputs_filtered (paddress (extract_typed_address
                                        (valaddr, builtin_type_void_data_ptr)),
                              stream);
            }
          else
            {
              val_print_type_code_int (type, valaddr, stream);
              if (ada_is_character_type (type))
                {
                  fputs_filtered (" ", stream);
                  ada_printchar ((unsigned char) unpack_long (type, valaddr),
                                 stream);
                }
            }
          return 0;
        }

    case TYPE_CODE_ENUM:
      if (format)
        {
          print_scalar_formatted (valaddr, type, format, 0, stream);
          break;
        }
      len = TYPE_NFIELDS (type);
      val = unpack_long (type, valaddr);
      for (i = 0; i < len; i++)
        {
          QUIT;
          if (val == TYPE_FIELD_BITPOS (type, i))
            {
              break;
            }
        }
      if (i < len)
        {
          const char *name = ada_enum_name (TYPE_FIELD_NAME (type, i));
          if (name[0] == '\'')
            fprintf_filtered (stream, "%ld %s", (long) val, name);
          else
            fputs_filtered (name, stream);
        }
      else
        {
          print_longest (stream, 'd', 0, val);
        }
      break;

    case TYPE_CODE_FLAGS:
      if (format)
          print_scalar_formatted (valaddr, type, format, 0, stream);
      else
        val_print_type_code_flags (type, valaddr, stream);
      break;

    case TYPE_CODE_FLT:
      if (format)
        return c_val_print (type, valaddr0, embedded_offset, address, stream,
                            format, deref_ref, recurse, pretty);
      else
        ada_print_floating (valaddr0 + embedded_offset, type, stream);
      break;

    case TYPE_CODE_UNION:
    case TYPE_CODE_STRUCT:
      if (ada_is_bogus_array_descriptor (type))
        {
          fprintf_filtered (stream, "(...?)");
          return 0;
        }
      else
        {
          print_record (type, valaddr, stream, format, recurse, pretty);
          return 0;
        }

    case TYPE_CODE_ARRAY:
      elttype = TYPE_TARGET_TYPE (type);
      if (elttype == NULL)
        eltlen = 0;
      else
        eltlen = TYPE_LENGTH (elttype);
      /* FIXME: This doesn't deal with non-empty arrays of
         0-length items (not a typical case!) */
      if (eltlen == 0)
        len = 0;
      else
        len = TYPE_LENGTH (type) / eltlen;

          /* For an array of chars, print with string syntax.  */
      if (ada_is_string_type (type) && (format == 0 || format == 's'))
        {
          if (prettyprint_arrays)
            {
              print_spaces_filtered (2 + 2 * recurse, stream);
            }
          /* If requested, look for the first null char and only print
             elements up to it.  */
          if (stop_print_at_null)
            {
              int temp_len;

              /* Look for a NULL char.  */
              for (temp_len = 0;
                   temp_len < len && temp_len < print_max
                     && char_at (valaddr, temp_len, eltlen) != 0;
                   temp_len += 1);
              len = temp_len;
            }

          printstr (stream, valaddr, len, 0, eltlen);
        }
      else
        {
          len = 0;
          fprintf_filtered (stream, "(");
          print_optional_low_bound (stream, type);
          if (TYPE_FIELD_BITSIZE (type, 0) > 0)
            val_print_packed_array_elements (type, valaddr, 0, stream,
                                             format, recurse, pretty);
          else
            val_print_array_elements (type, valaddr, address, stream,
                                      format, deref_ref, recurse,
                                      pretty, 0);
          fprintf_filtered (stream, ")");
        }
      gdb_flush (stream);
      return len;

    case TYPE_CODE_REF:
      /* For references, the debugger is expected to print the value as
         an address if DEREF_REF is null.  But printing an address in place
         of the object value would be confusing to an Ada programmer.
         So, for Ada values, we print the actual dereferenced value
         regardless.  */
      elttype = check_typedef (TYPE_TARGET_TYPE (type));
      
      if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
        {
          LONGEST deref_val_int = (LONGEST)
            unpack_pointer (lookup_pointer_type (builtin_type_void),
                            valaddr);
          if (deref_val_int != 0)
            {
              struct value *deref_val =
                ada_value_ind (value_from_longest
                               (lookup_pointer_type (elttype),
                                deref_val_int));
              val_print (value_type (deref_val),
                         value_contents (deref_val), 0,
                         VALUE_ADDRESS (deref_val), stream, format,
                         deref_ref, recurse + 1, pretty);
            }
          else
            fputs_filtered ("(null)", stream);
        }
      else
        fputs_filtered ("???", stream);

      break;
    }
  gdb_flush (stream);
  return 0;
}

static int
print_variant_part (struct type *type, int field_num, const gdb_byte *valaddr,
                    struct ui_file *stream, int format, int recurse,
                    enum val_prettyprint pretty, int comma_needed,
                    struct type *outer_type, const gdb_byte *outer_valaddr)
{
  struct type *var_type = TYPE_FIELD_TYPE (type, field_num);
  int which = ada_which_variant_applies (var_type, outer_type, outer_valaddr);

  if (which < 0)
    return 0;
  else
    return print_field_values
      (TYPE_FIELD_TYPE (var_type, which),
       valaddr + TYPE_FIELD_BITPOS (type, field_num) / HOST_CHAR_BIT
       + TYPE_FIELD_BITPOS (var_type, which) / HOST_CHAR_BIT,
       stream, format, recurse, pretty,
       comma_needed, outer_type, outer_valaddr);
}

int
ada_value_print (struct value *val0, struct ui_file *stream, int format,
                 enum val_prettyprint pretty)
{
  const gdb_byte *valaddr = value_contents (val0);
  CORE_ADDR address = VALUE_ADDRESS (val0) + value_offset (val0);
  struct type *type =
    ada_to_fixed_type (value_type (val0), valaddr, address, NULL, 1);
  struct value *val =
    value_from_contents_and_address (type, valaddr, address);

  /* If it is a pointer, indicate what it points to.  */
  if (TYPE_CODE (type) == TYPE_CODE_PTR)
    {
      /* Hack:  don't print (char *) for char strings.  Their
         type is indicated by the quoted string anyway.  */
      if (TYPE_LENGTH (TYPE_TARGET_TYPE (type)) != sizeof (char)
          || TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_INT 
          || TYPE_UNSIGNED (TYPE_TARGET_TYPE (type)))
        {
          fprintf_filtered (stream, "(");
          type_print (type, "", stream, -1);
          fprintf_filtered (stream, ") ");
        }
    }
  else if (ada_is_array_descriptor_type (type))
    {
      fprintf_filtered (stream, "(");
      type_print (type, "", stream, -1);
      fprintf_filtered (stream, ") ");
    }
  else if (ada_is_bogus_array_descriptor (type))
    {
      fprintf_filtered (stream, "(");
      type_print (type, "", stream, -1);
      fprintf_filtered (stream, ") (...?)");
      return 0;
    }

  if (TYPE_CODE (type) == TYPE_CODE_ARRAY
      && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) == 0
      && TYPE_CODE (TYPE_INDEX_TYPE (type)) == TYPE_CODE_RANGE)
    {
      /* This is an array of zero-length elements, that is an array
         of null records.  This array needs to be printed by hand,
         as the standard routine to print arrays relies on the size of
         the array elements to be nonzero.  This is because it computes
         the number of elements in the array by dividing the array size
         by the array element size.  */
      fprintf_filtered (stream, "(%d .. %d => ())",
                        TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)),
                        TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (type)));
      return 0;
    }
  
  return (val_print (type, value_contents (val), 0, address,
                     stream, format, 1, 0, pretty));
}

static void
print_record (struct type *type, const gdb_byte *valaddr,
              struct ui_file *stream, int format, int recurse,
              enum val_prettyprint pretty)
{
  type = ada_check_typedef (type);

  fprintf_filtered (stream, "(");

  if (print_field_values (type, valaddr, stream, format, recurse, pretty,
                          0, type, valaddr) != 0 && pretty)
    {
      fprintf_filtered (stream, "\n");
      print_spaces_filtered (2 * recurse, stream);
    }

  fprintf_filtered (stream, ")");
}

/* Print out fields of value at VALADDR having structure type TYPE.

   TYPE, VALADDR, STREAM, FORMAT, RECURSE, and PRETTY have the
   same meanings as in ada_print_value and ada_val_print.

   OUTER_TYPE and OUTER_VALADDR give type and address of enclosing record
   (used to get discriminant values when printing variant parts).

   COMMA_NEEDED is 1 if fields have been printed at the current recursion
   level, so that a comma is needed before any field printed by this
   call.

   Returns 1 if COMMA_NEEDED or any fields were printed.  */

static int
print_field_values (struct type *type, const gdb_byte *valaddr,
                    struct ui_file *stream, int format, int recurse,
                    enum val_prettyprint pretty, int comma_needed,
                    struct type *outer_type, const gdb_byte *outer_valaddr)
{
  int i, len;

  len = TYPE_NFIELDS (type);

  for (i = 0; i < len; i += 1)
    {
      if (ada_is_ignored_field (type, i))
        continue;

      if (ada_is_wrapper_field (type, i))
        {
          comma_needed =
            print_field_values (TYPE_FIELD_TYPE (type, i),
                                valaddr
                                + TYPE_FIELD_BITPOS (type, i) / HOST_CHAR_BIT,
                                stream, format, recurse, pretty,
                                comma_needed, type, valaddr);
          continue;
        }
      else if (ada_is_variant_part (type, i))
        {
          comma_needed =
            print_variant_part (type, i, valaddr,
                                stream, format, recurse, pretty, comma_needed,
                                outer_type, outer_valaddr);
          continue;
        }

      if (comma_needed)
        fprintf_filtered (stream, ", ");
      comma_needed = 1;

      if (pretty)
        {
          fprintf_filtered (stream, "\n");
          print_spaces_filtered (2 + 2 * recurse, stream);
        }
      else
        {
          wrap_here (n_spaces (2 + 2 * recurse));
        }
      if (inspect_it)
        {
          if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
            fputs_filtered ("\"( ptr \"", stream);
          else
            fputs_filtered ("\"( nodef \"", stream);
          fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
                                   language_cplus, DMGL_NO_OPTS);
          fputs_filtered ("\" \"", stream);
          fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
                                   language_cplus, DMGL_NO_OPTS);
          fputs_filtered ("\") \"", stream);
        }
      else
        {
          annotate_field_begin (TYPE_FIELD_TYPE (type, i));
          fprintf_filtered (stream, "%.*s",
                            ada_name_prefix_len (TYPE_FIELD_NAME (type, i)),
                            TYPE_FIELD_NAME (type, i));
          annotate_field_name_end ();
          fputs_filtered (" => ", stream);
          annotate_field_value ();
        }

      if (TYPE_FIELD_PACKED (type, i))
        {
          struct value *v;

          /* Bitfields require special handling, especially due to byte
             order problems.  */
          if (TYPE_CPLUS_SPECIFIC (type) != NULL
              && TYPE_FIELD_IGNORE (type, i))
            {
              fputs_filtered (_("<optimized out or zero length>"), stream);
            }
          else
            {
              int bit_pos = TYPE_FIELD_BITPOS (type, i);
              int bit_size = TYPE_FIELD_BITSIZE (type, i);

              adjust_type_signedness (TYPE_FIELD_TYPE (type, i));
              v = ada_value_primitive_packed_val (NULL, valaddr,
                                                  bit_pos / HOST_CHAR_BIT,
                                                  bit_pos % HOST_CHAR_BIT,
                                                  bit_size,
                                                  TYPE_FIELD_TYPE (type, i));
              val_print (TYPE_FIELD_TYPE (type, i), value_contents (v), 0, 0,
                         stream, format, 0, recurse + 1, pretty);
            }
        }
      else
        ada_val_print (TYPE_FIELD_TYPE (type, i),
                       valaddr + TYPE_FIELD_BITPOS (type, i) / HOST_CHAR_BIT,
                       0, 0, stream, format, 0, recurse + 1, pretty);
      annotate_field_end ();
    }

  return comma_needed;
}