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

   Copyright (C) 1986, 1988, 1989, 1991, 1997, 1998, 1999, 2000, 2001, 2002,

   2003, 2004, 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/>.  */

#include "defs.h"

#include "gdb_obstack.h"

#include "bfd.h"                /* Binary File Description */

#include "symtab.h"

#include "gdbtypes.h"

#include "expression.h"

#include "value.h"

#include "gdbcore.h"

#include "target.h"

#include "command.h"

#include "gdbcmd.h"

#include "language.h"

#include "demangle.h"

#include "c-lang.h"

#include "typeprint.h"

#include "ada-lang.h"

#include <ctype.h>

#include "gdb_string.h"

#include <errno.h>

static int print_record_field_types (struct type *, struct type *,

                                     struct ui_file *, int, int);

static void print_array_type (struct type *, struct ui_file *, int, int);

static void print_choices (struct type *, int, struct ui_file *,

                           struct type *);

static void print_range (struct type *, struct ui_file *);

static void print_range_bound (struct type *, char *, int *,

                               struct ui_file *);

static void

print_dynamic_range_bound (struct type *, const char *, int,

                           const char *, struct ui_file *);

static void print_range_type (struct type *, struct ui_file *);

static char *name_buffer;

static int name_buffer_len;

/* The (decoded) Ada name of TYPE.  This value persists until the

   next call.  */

static char *

decoded_type_name (struct type *type)

{

  if (ada_type_name (type) == NULL)

    return NULL;

  else

    {

      char *raw_name = ada_type_name (type);

      char *s, *q;

      if (name_buffer == NULL || name_buffer_len <= strlen (raw_name))

        {

          name_buffer_len = 16 + 2 * strlen (raw_name);

          name_buffer = xrealloc (name_buffer, name_buffer_len);

        }

      strcpy (name_buffer, raw_name);

      s = (char *) strstr (name_buffer, "___");

      if (s != NULL)

        *s = '\0';

      s = name_buffer + strlen (name_buffer) - 1;

      while (s > name_buffer && (s[0] != '_' || s[-1] != '_'))

        s -= 1;

      if (s == name_buffer)

        return name_buffer;

      if (!islower (s[1]))

        return NULL;

      for (s = q = name_buffer; *s != '\0'; q += 1)

        {

          if (s[0] == '_' && s[1] == '_')

            {

              *q = '.';

              s += 2;

            }

          else

            {

              *q = *s;

              s += 1;

            }

        }

      *q = '\0';

      return name_buffer;

    }

}

/* Print TYPE on STREAM, preferably as a range.  */

static void

print_range (struct type *type, struct ui_file *stream)

{

  switch (TYPE_CODE (type))

    {

    case TYPE_CODE_RANGE:

    case TYPE_CODE_ENUM:

      {

        struct type *target_type;

        target_type = TYPE_TARGET_TYPE (type);

        if (target_type == NULL)

          target_type = type;

        ada_print_scalar (target_type, ada_discrete_type_low_bound (type),

                          stream);

        fprintf_filtered (stream, " .. ");

        ada_print_scalar (target_type, ada_discrete_type_high_bound (type),

                          stream);

      }

      break;

    default:

      fprintf_filtered (stream, "%.*s",

                        ada_name_prefix_len (TYPE_NAME (type)),

                        TYPE_NAME (type));

      break;

    }

}

/* Print the number or discriminant bound at BOUNDS+*N on STREAM, and

   set *N past the bound and its delimiter, if any.  */

static void

print_range_bound (struct type *type, char *bounds, int *n,

                   struct ui_file *stream)

{

  LONGEST B;

  if (ada_scan_number (bounds, *n, &B, n))

    {

      /* STABS decodes all range types which bounds are 0 .. -1 as

         unsigned integers (ie. the type code is TYPE_CODE_INT, not

         TYPE_CODE_RANGE).  Unfortunately, ada_print_scalar() relies

         on the unsigned flag to determine whether the bound should

         be printed as a signed or an unsigned value.  This causes

         the upper bound of the 0 .. -1 range types to be printed as

         a very large unsigned number instead of -1.

         To workaround this stabs deficiency, we replace the TYPE by NULL

         to indicate default output when we detect that the bound is negative,

         and the type is a TYPE_CODE_INT.  The bound is negative when

         'm' is the last character of the number scanned in BOUNDS.  */

      if (bounds[*n - 1] == 'm' && TYPE_CODE (type) == TYPE_CODE_INT)

        type = NULL;

      ada_print_scalar (type, B, stream);

      if (bounds[*n] == '_')

        *n += 2;

    }

  else

    {

      int bound_len;

      char *bound = bounds + *n;

      char *pend;

      pend = strstr (bound, "__");

      if (pend == NULL)

        *n += bound_len = strlen (bound);

      else

        {

          bound_len = pend - bound;

          *n += bound_len + 2;

        }

      fprintf_filtered (stream, "%.*s", bound_len, bound);

    }

}

/* Assuming NAME[0 .. NAME_LEN-1] is the name of a range type, print

   the value (if found) of the bound indicated by SUFFIX ("___L" or

   "___U") according to the ___XD conventions.  */

static void

print_dynamic_range_bound (struct type *type, const char *name, int name_len,

                           const char *suffix, struct ui_file *stream)

{

  static char *name_buf = NULL;

  static size_t name_buf_len = 0;

  LONGEST B;

  int OK;

  GROW_VECT (name_buf, name_buf_len, name_len + strlen (suffix) + 1);

  strncpy (name_buf, name, name_len);

  strcpy (name_buf + name_len, suffix);

  B = get_int_var_value (name_buf, &OK);

  if (OK)

    ada_print_scalar (type, B, stream);

  else

    fprintf_filtered (stream, "?");

}

/* Print RAW_TYPE as a range type, using any bound information

   following the GNAT encoding (if available).  */

static void

print_range_type (struct type *raw_type, struct ui_file *stream)

{

  char *name;

  struct type *base_type;

  char *subtype_info;

  gdb_assert (raw_type != NULL);

  name = TYPE_NAME (raw_type);

  gdb_assert (name != NULL);

  if (TYPE_CODE (raw_type) == TYPE_CODE_RANGE)

    base_type = TYPE_TARGET_TYPE (raw_type);

  else

    base_type = raw_type;

  subtype_info = strstr (name, "___XD");

  if (subtype_info == NULL)

    print_range (raw_type, stream);

  else

    {

      int prefix_len = subtype_info - name;

      char *bounds_str;

      int n;

      subtype_info += 5;

      bounds_str = strchr (subtype_info, '_');

      n = 1;

      if (*subtype_info == 'L')

        {

          print_range_bound (base_type, bounds_str, &n, stream);

          subtype_info += 1;

        }

      else

        print_dynamic_range_bound (base_type, name, prefix_len, "___L",

                                   stream);

      fprintf_filtered (stream, " .. ");

      if (*subtype_info == 'U')

        print_range_bound (base_type, bounds_str, &n, stream);

      else

        print_dynamic_range_bound (base_type, name, prefix_len, "___U",

                                   stream);

    }

}

/* Print enumerated type TYPE on STREAM.  */

static void

print_enum_type (struct type *type, struct ui_file *stream)

{

  int len = TYPE_NFIELDS (type);

  int i, lastval;

  fprintf_filtered (stream, "(");

  wrap_here (" ");

  lastval = 0;

  for (i = 0; i < len; i++)

    {

      QUIT;

      if (i)

        fprintf_filtered (stream, ", ");

      wrap_here ("    ");

      fputs_filtered (ada_enum_name (TYPE_FIELD_NAME (type, i)), stream);

      if (lastval != TYPE_FIELD_BITPOS (type, i))

        {

          fprintf_filtered (stream, " => %d", TYPE_FIELD_BITPOS (type, i));

          lastval = TYPE_FIELD_BITPOS (type, i);

        }

      lastval += 1;

    }

  fprintf_filtered (stream, ")");

}

/* Print representation of Ada fixed-point type TYPE on STREAM.  */

static void

print_fixed_point_type (struct type *type, struct ui_file *stream)

{

  DOUBLEST delta = ada_delta (type);

  DOUBLEST small = ada_fixed_to_float (type, 1.0);

  if (delta < 0.0)

    fprintf_filtered (stream, "delta ??");

  else

    {

      fprintf_filtered (stream, "delta %g", (double) delta);

      if (delta != small)

        fprintf_filtered (stream, " <'small = %g>", (double) small);

    }

}

/* Print simple (constrained) array type TYPE on STREAM.  LEVEL is the

   recursion (indentation) level, in case the element type itself has

   nested structure, and SHOW is the number of levels of internal

   structure to show (see ada_print_type).  */

static void

print_array_type (struct type *type, struct ui_file *stream, int show,

                  int level)

{

  int bitsize;

  int n_indices;

  if (ada_is_constrained_packed_array_type (type))

    type = ada_coerce_to_simple_array_type (type);

  bitsize = 0;

  fprintf_filtered (stream, "array (");

  if (type == NULL)

    {

      fprintf_filtered (stream, _("<undecipherable array type>"));

      return;

    }

  n_indices = -1;

  if (show < 0)

    fprintf_filtered (stream, "...");

  else

    {

      if (ada_is_simple_array_type (type))

        {

          struct type *range_desc_type;

          struct type *arr_type;

          range_desc_type = ada_find_parallel_type (type, "___XA");

          ada_fixup_array_indexes_type (range_desc_type);

          bitsize = 0;

          if (range_desc_type == NULL)

            {

              for (arr_type = type; TYPE_CODE (arr_type) == TYPE_CODE_ARRAY;

                   arr_type = TYPE_TARGET_TYPE (arr_type))

                {

                  if (arr_type != type)

                    fprintf_filtered (stream, ", ");

                  print_range (TYPE_INDEX_TYPE (arr_type), stream);

                  if (TYPE_FIELD_BITSIZE (arr_type, 0) > 0)

                    bitsize = TYPE_FIELD_BITSIZE (arr_type, 0);

                }

            }

          else

            {

              int k;

              n_indices = TYPE_NFIELDS (range_desc_type);

              for (k = 0, arr_type = type;

                   k < n_indices;

                   k += 1, arr_type = TYPE_TARGET_TYPE (arr_type))

                {

                  if (k > 0)

                    fprintf_filtered (stream, ", ");

                  print_range_type (TYPE_FIELD_TYPE (range_desc_type, k),

                                    stream);

                  if (TYPE_FIELD_BITSIZE (arr_type, 0) > 0)

                    bitsize = TYPE_FIELD_BITSIZE (arr_type, 0);

                }

            }

        }

      else

        {

          int i, i0;

          for (i = i0 = ada_array_arity (type); i > 0; i -= 1)

            fprintf_filtered (stream, "%s<>", i == i0 ? "" : ", ");

        }

    }

  fprintf_filtered (stream, ") of ");

  wrap_here ("");

  ada_print_type (ada_array_element_type (type, n_indices), "", stream,

                  show == 0 ? 0 : show - 1, level + 1);

  if (bitsize > 0)

    fprintf_filtered (stream, " <packed: %d-bit elements>", bitsize);

}

/* Print the choices encoded by field FIELD_NUM of variant-part TYPE on

   STREAM, assuming that VAL_TYPE (if non-NULL) is the type of the values.  */

static void

print_choices (struct type *type, int field_num, struct ui_file *stream,

               struct type *val_type)

{

  int have_output;

  int p;

  const char *name = TYPE_FIELD_NAME (type, field_num);

  have_output = 0;

  /* Skip over leading 'V': NOTE soon to be obsolete.  */

  if (name[0] == 'V')

    {

      if (!ada_scan_number (name, 1, NULL, &p))

        goto Huh;

    }

  else

    p = 0;

  while (1)

    {

      switch (name[p])

        {

        default:

          return;

        case 'S':

        case 'R':

        case 'O':

          if (have_output)

            fprintf_filtered (stream, " | ");

          have_output = 1;

          break;

        }

      switch (name[p])

        {

        case 'S':

          {

            LONGEST W;

            if (!ada_scan_number (name, p + 1, &W, &p))

              goto Huh;

            ada_print_scalar (val_type, W, stream);

            break;

          }

        case 'R':

          {

            LONGEST L, U;

            if (!ada_scan_number (name, p + 1, &L, &p)

                || name[p] != 'T' || !ada_scan_number (name, p + 1, &U, &p))

              goto Huh;

            ada_print_scalar (val_type, L, stream);

            fprintf_filtered (stream, " .. ");

            ada_print_scalar (val_type, U, stream);

            break;

          }

        case 'O':

          fprintf_filtered (stream, "others");

          p += 1;

          break;

        }

    }

Huh:

  fprintf_filtered (stream, "??");

}

/* Assuming that field FIELD_NUM of TYPE is a VARIANTS field whose

   discriminant is contained in OUTER_TYPE, print its variants on STREAM.

   LEVEL is the recursion

   (indentation) level, in case any of the fields themselves have

   nested structure, and SHOW is the number of levels of internal structure

   to show (see ada_print_type).  For this purpose, fields nested in a

   variant part are taken to be at the same level as the fields

   immediately outside the variant part.  */

static void

print_variant_clauses (struct type *type, int field_num,

                       struct type *outer_type, struct ui_file *stream,

                       int show, int level)

{

  int i;

  struct type *var_type, *par_type;

  struct type *discr_type;

  var_type = TYPE_FIELD_TYPE (type, field_num);

  discr_type = ada_variant_discrim_type (var_type, outer_type);

  if (TYPE_CODE (var_type) == TYPE_CODE_PTR)

    {

      var_type = TYPE_TARGET_TYPE (var_type);

      if (var_type == NULL || TYPE_CODE (var_type) != TYPE_CODE_UNION)

        return;

    }

  par_type = ada_find_parallel_type (var_type, "___XVU");

  if (par_type != NULL)

    var_type = par_type;

  for (i = 0; i < TYPE_NFIELDS (var_type); i += 1)

    {

      fprintf_filtered (stream, "\n%*swhen ", level + 4, "");

      print_choices (var_type, i, stream, discr_type);

      fprintf_filtered (stream, " =>");

      if (print_record_field_types (TYPE_FIELD_TYPE (var_type, i),

                                    outer_type, stream, show, level + 4) <= 0)

        fprintf_filtered (stream, " null;");

    }

}

/* Assuming that field FIELD_NUM of TYPE is a variant part whose

   discriminants are contained in OUTER_TYPE, print a description of it

   on STREAM.  LEVEL is the recursion (indentation) level, in case any of

   the fields themselves have nested structure, and SHOW is the number of

   levels of internal structure to show (see ada_print_type).  For this

   purpose, fields nested in a variant part are taken to be at the same

   level as the fields immediately outside the variant part.  */

static void

print_variant_part (struct type *type, int field_num, struct type *outer_type,

                    struct ui_file *stream, int show, int level)

{

  fprintf_filtered (stream, "\n%*scase %s is", level + 4, "",

                    ada_variant_discrim_name

                    (TYPE_FIELD_TYPE (type, field_num)));

  print_variant_clauses (type, field_num, outer_type, stream, show,

                         level + 4);

  fprintf_filtered (stream, "\n%*send case;", level + 4, "");

}

/* Print a description on STREAM of the fields in record type TYPE, whose

   discriminants are in OUTER_TYPE.  LEVEL is the recursion (indentation)

   level, in case any of the fields themselves have nested structure,

   and SHOW is the number of levels of internal structure to show

   (see ada_print_type).  Does not print parent type information of TYPE.

   Returns 0 if no fields printed, -1 for an incomplete type, else > 0.

   Prints each field beginning on a new line, but does not put a new line at

   end.  */

static int

print_record_field_types (struct type *type, struct type *outer_type,

                          struct ui_file *stream, int show, int level)

{

  int len, i, flds;

  flds = 0;

  len = TYPE_NFIELDS (type);

  if (len == 0 && TYPE_STUB (type))

    return -1;

  for (i = 0; i < len; i += 1)

    {

      QUIT;

      if (ada_is_parent_field (type, i) || ada_is_ignored_field (type, i))

        ;

      else if (ada_is_wrapper_field (type, i))

        flds += print_record_field_types (TYPE_FIELD_TYPE (type, i), type,

                                          stream, show, level);

      else if (ada_is_variant_part (type, i))

        {

          print_variant_part (type, i, outer_type, stream, show, level);

          flds = 1;

        }

      else

        {

          flds += 1;

          fprintf_filtered (stream, "\n%*s", level + 4, "");

          ada_print_type (TYPE_FIELD_TYPE (type, i),

                          TYPE_FIELD_NAME (type, i),

                          stream, show - 1, level + 4);

          fprintf_filtered (stream, ";");

        }

    }

  return flds;

}

/* Print record type TYPE on STREAM.  LEVEL is the recursion (indentation)

   level, in case the element type itself has nested structure, and SHOW is

   the number of levels of internal structure to show (see ada_print_type).  */

static void

print_record_type (struct type *type0, struct ui_file *stream, int show,

                   int level)

{

  struct type *parent_type;

  struct type *type;

  type = ada_find_parallel_type (type0, "___XVE");

  if (type == NULL)

    type = type0;

  parent_type = ada_parent_type (type);

  if (ada_type_name (parent_type) != NULL)

    fprintf_filtered (stream, "new %s with record",

                      decoded_type_name (parent_type));

  else if (parent_type == NULL && ada_is_tagged_type (type, 0))

    fprintf_filtered (stream, "tagged record");

  else

    fprintf_filtered (stream, "record");

  if (show < 0)

    fprintf_filtered (stream, " ... end record");

  else

    {

      int flds;

      flds = 0;

      if (parent_type != NULL && ada_type_name (parent_type) == NULL)

        flds += print_record_field_types (parent_type, parent_type,

                                          stream, show, level);

      flds += print_record_field_types (type, type, stream, show, level);

      if (flds > 0)

        fprintf_filtered (stream, "\n%*send record", level, "");

      else if (flds < 0)

        fprintf_filtered (stream, _(" <incomplete type> end record"));

      else

        fprintf_filtered (stream, " null; end record");

    }

}

/* Print the unchecked union type TYPE in something resembling Ada

   format on STREAM.  LEVEL is the recursion (indentation) level

   in case the element type itself has nested structure, and SHOW is the

   number of levels of internal structure to show (see ada_print_type).  */

static void

print_unchecked_union_type (struct type *type, struct ui_file *stream,

                            int show, int level)

{

  if (show < 0)

    fprintf_filtered (stream, "record (?) is ... end record");

  else if (TYPE_NFIELDS (type) == 0)

    fprintf_filtered (stream, "record (?) is null; end record");

  else

    {

      int i;

      fprintf_filtered (stream, "record (?) is\n%*scase ? is", level + 4, "");

      for (i = 0; i < TYPE_NFIELDS (type); i += 1)

        {

          fprintf_filtered (stream, "\n%*swhen ? =>\n%*s", level + 8, "",

                            level + 12, "");

          ada_print_type (TYPE_FIELD_TYPE (type, i),

                          TYPE_FIELD_NAME (type, i),

                          stream, show - 1, level + 12);

          fprintf_filtered (stream, ";");

        }

      fprintf_filtered (stream, "\n%*send case;\n%*send record",

                        level + 4, "", level, "");

    }

}