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/* Support for printing Modula 2 types for GDB, the GNU debugger.

   Copyright (C) 1986, 1988, 1989, 1991, 1992, 1995, 2000, 2001, 2002, 2003,

                 2004, 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/>.  */

#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 "m2-lang.h"

#include "target.h"

#include "language.h"

#include "demangle.h"

#include "c-lang.h"

#include "typeprint.h"

#include "cp-abi.h"

#include "gdb_string.h"

#include <errno.h>

static void m2_print_bounds (struct type *type,

                             struct ui_file *stream, int show, int level,

                             int print_high);

static void m2_typedef (struct type *, struct ui_file *, int, int);

static void m2_array (struct type *, struct ui_file *, int, int);

static void m2_pointer (struct type *, struct ui_file *, int, int);

static void m2_ref (struct type *, struct ui_file *, int, int);

static void m2_procedure (struct type *, struct ui_file *, int, int);

static void m2_union (struct type *, struct ui_file *);

static void m2_enum (struct type *, struct ui_file *, int, int);

static void m2_range (struct type *, struct ui_file *, int, int);

static void m2_type_name (struct type *type, struct ui_file *stream);

static void m2_short_set (struct type *type, struct ui_file *stream,

                          int show, int level);

static int m2_long_set (struct type *type, struct ui_file *stream,

                        int show, int level);

static int m2_unbounded_array (struct type *type, struct ui_file *stream,

                               int show, int level);

static void m2_record_fields (struct type *type, struct ui_file *stream,

                              int show, int level);

static void m2_unknown (const char *s, struct type *type,

                        struct ui_file *stream, int show, int level);

int m2_is_long_set (struct type *type);

int m2_is_long_set_of_type (struct type *type, struct type **of_type);

int m2_is_unbounded_array (struct type *type);

void

m2_print_type (struct type *type, const char *varstring, struct ui_file *stream,

               int show, int level)

{

  enum type_code code;

  CHECK_TYPEDEF (type);

  QUIT;

  wrap_here ("    ");

  if (type == NULL)

    {

      fputs_filtered (_("<type unknown>"), stream);

      return;

    }

  code = TYPE_CODE (type);

  switch (TYPE_CODE (type))

    {

    case TYPE_CODE_SET:

      m2_short_set(type, stream, show, level);

      break;

    case TYPE_CODE_STRUCT:

      if (m2_long_set (type, stream, show, level)

          || m2_unbounded_array (type, stream, show, level))

        break;

      m2_record_fields (type, stream, show, level);

      break;

    case TYPE_CODE_TYPEDEF:

      m2_typedef (type, stream, show, level);

      break;

    case TYPE_CODE_ARRAY:

      m2_array (type, stream, show, level);

      break;

    case TYPE_CODE_PTR:

      m2_pointer (type, stream, show, level);

      break;

    case TYPE_CODE_REF:

      m2_ref (type, stream, show, level);

      break;

    case TYPE_CODE_METHOD:

      m2_unknown (_("method"), type, stream, show, level);

      break;

    case TYPE_CODE_FUNC:

      m2_procedure (type, stream, show, level);

      break;

    case TYPE_CODE_UNION:

      m2_union (type, stream);

      break;

    case TYPE_CODE_ENUM:

      m2_enum (type, stream, show, level);

      break;

    case TYPE_CODE_VOID:

      break;

    case TYPE_CODE_UNDEF:

      /* i18n: Do not translate the "struct" part! */

      m2_unknown (_("undef"), type, stream, show, level);

      break;

    case TYPE_CODE_ERROR:

      m2_unknown (_("error"), type, stream, show, level);

      break;

    case TYPE_CODE_RANGE:

      m2_range (type, stream, show, level);

      break;

    default:

      m2_type_name (type, stream);

      break;

    }

}

/* Print a typedef using M2 syntax.  TYPE is the underlying type.

   NEW_SYMBOL is the symbol naming the type.  STREAM is the stream on

   which to print.  */

void

m2_print_typedef (struct type *type, struct symbol *new_symbol,

                  struct ui_file *stream)

{

  CHECK_TYPEDEF (type);

  fprintf_filtered (stream, "TYPE ");

  if (!TYPE_NAME (SYMBOL_TYPE (new_symbol))

      || strcmp (TYPE_NAME ((SYMBOL_TYPE (new_symbol))),

                 SYMBOL_LINKAGE_NAME (new_symbol)) != 0)

    fprintf_filtered (stream, "%s = ", SYMBOL_PRINT_NAME (new_symbol));

  else

    fprintf_filtered (stream, "<builtin> = ");

  type_print (type, "", stream, 0);

  fprintf_filtered (stream, ";\n");

}

/* m2_type_name - if a, type, has a name then print it.  */

void

m2_type_name (struct type *type, struct ui_file *stream)

{

  if (TYPE_NAME (type) != NULL)

    fputs_filtered (TYPE_NAME (type), stream);

}

/* m2_range - displays a Modula-2 subrange type.  */

void

m2_range (struct type *type, struct ui_file *stream, int show,

          int level)

{

  if (TYPE_HIGH_BOUND (type) == TYPE_LOW_BOUND (type))

    m2_print_type (TYPE_DOMAIN_TYPE (type), "", stream, show, level);

  else

    {

      struct type *target = TYPE_TARGET_TYPE (type);

      fprintf_filtered (stream, "[");

      print_type_scalar (target, TYPE_LOW_BOUND (type), stream);

      fprintf_filtered (stream, "..");

      print_type_scalar (target, TYPE_HIGH_BOUND (type), stream);

      fprintf_filtered (stream, "]");

    }

}

static void

m2_typedef (struct type *type, struct ui_file *stream, int show,

            int level)

{

  if (TYPE_NAME (type) != NULL)

    {

      fputs_filtered (TYPE_NAME (type), stream);

      fputs_filtered (" = ", stream);

    }

  m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);

}

/* m2_array - prints out a Modula-2 ARRAY ... OF type.  */

static void m2_array (struct type *type, struct ui_file *stream,

                      int show, int level)

{

  fprintf_filtered (stream, "ARRAY [");

  if (TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0

      && !TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type))

    {

      if (TYPE_INDEX_TYPE (type) != 0)

        {

          m2_print_bounds (TYPE_INDEX_TYPE (type), stream, show, -1, 0);

          fprintf_filtered (stream, "..");

          m2_print_bounds (TYPE_INDEX_TYPE (type), stream, show, -1, 1);

        }

      else

        fprintf_filtered (stream, "%d",

                          (TYPE_LENGTH (type)

                           / TYPE_LENGTH (TYPE_TARGET_TYPE (type))));

    }

  fprintf_filtered (stream, "] OF ");

  m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);

}

static void

m2_pointer (struct type *type, struct ui_file *stream, int show,

            int level)

{

  if (TYPE_CONST (type))

    fprintf_filtered (stream, "[...] : ");

  else

    fprintf_filtered (stream, "POINTER TO ");

  m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);

}

static void

m2_ref (struct type *type, struct ui_file *stream, int show,

        int level)

{

  fprintf_filtered (stream, "VAR");

  m2_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);

}

static void

m2_unknown (const char *s, struct type *type, struct ui_file *stream,

            int show, int level)

{

  fprintf_filtered (stream, "%s %s", s, _("is unknown"));

}

static void m2_union (struct type *type, struct ui_file *stream)

{

  fprintf_filtered (stream, "union");

}

static void

m2_procedure (struct type *type, struct ui_file *stream,

              int show, int level)

{

  fprintf_filtered (stream, "PROCEDURE ");

  m2_type_name (type, stream);

  if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)

    {

      int i, len = TYPE_NFIELDS (type);

      fprintf_filtered (stream, " (");

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

        {

          if (i > 0)

            {

              fputs_filtered (", ", stream);

              wrap_here ("    ");

            }

          m2_print_type (TYPE_FIELD_TYPE (type, i), "", stream, -1, 0);

        }

      if (TYPE_TARGET_TYPE (type) != NULL)

        {

          fprintf_filtered (stream, " : ");

          m2_print_type (TYPE_TARGET_TYPE (type), "", stream, 0, 0);

        }

    }

}

static void

m2_print_bounds (struct type *type,

                 struct ui_file *stream, int show, int level,

                 int print_high)

{

  struct type *target = TYPE_TARGET_TYPE (type);

  if (TYPE_NFIELDS(type) == 0)

    return;

  if (print_high)

    print_type_scalar (target, TYPE_HIGH_BOUND (type), stream);

  else

    print_type_scalar (target, TYPE_LOW_BOUND (type), stream);

}

static void

m2_short_set (struct type *type, struct ui_file *stream, int show, int level)

{

  fprintf_filtered(stream, "SET [");

  m2_print_bounds (TYPE_INDEX_TYPE (type), stream,

                   show - 1, level, 0);

  fprintf_filtered(stream, "..");

  m2_print_bounds (TYPE_INDEX_TYPE (type), stream,

                   show - 1, level, 1);

  fprintf_filtered(stream, "]");

}

int

m2_is_long_set (struct type *type)

{

  LONGEST previous_high = 0;  /* unnecessary initialization

                                 keeps gcc -Wall happy */

  int len, i;

  struct type *range;

  if (TYPE_CODE (type) == TYPE_CODE_STRUCT)

    {

      /* check if all fields of the RECORD are consecutive sets.  */

      len = TYPE_NFIELDS (type);

      for (i = TYPE_N_BASECLASSES (type); i < len; i++)

        {

          if (TYPE_FIELD_TYPE (type, i) == NULL)

            return 0;

          if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) != TYPE_CODE_SET)

            return 0;

          if (TYPE_FIELD_NAME (type, i) != NULL

              && (strcmp (TYPE_FIELD_NAME (type, i), "") != 0))

            return 0;

          range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i));

          if ((i > TYPE_N_BASECLASSES (type))

              && previous_high + 1 != TYPE_LOW_BOUND (range))

            return 0;

          previous_high = TYPE_HIGH_BOUND (range);

        }

      return len>0;

    }

  return 0;

}

/* m2_get_discrete_bounds - a wrapper for get_discrete_bounds which

                            understands that CHARs might be signed.

                            This should be integrated into gdbtypes.c

                            inside get_discrete_bounds.  */

static int

m2_get_discrete_bounds (struct type *type, LONGEST *lowp, LONGEST *highp)

{

  CHECK_TYPEDEF (type);

  switch (TYPE_CODE (type))

    {

    case TYPE_CODE_CHAR:

      if (TYPE_LENGTH (type) < sizeof (LONGEST))

        {

          if (!TYPE_UNSIGNED (type))

            {

              *lowp = -(1 << (TYPE_LENGTH (type) * TARGET_CHAR_BIT - 1));

              *highp = -*lowp - 1;

              return 0;

            }

        }

      /* fall through */

    default:

      return get_discrete_bounds (type, lowp, highp);

    }

}

/* m2_is_long_set_of_type - returns TRUE if the long set was declared as

                            SET OF <oftype> of_type is assigned to the

                            subtype.  */

int

m2_is_long_set_of_type (struct type *type, struct type **of_type)

{

  int len, i;

  struct type *range;

  struct type *target;

  LONGEST l1, l2;

  LONGEST h1, h2;

  if (TYPE_CODE (type) == TYPE_CODE_STRUCT)

    {

      len = TYPE_NFIELDS (type);

      i = TYPE_N_BASECLASSES (type);

      if (len == 0)

        return 0;

      range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i));

      target = TYPE_TARGET_TYPE (range);

      l1 = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)));

      h1 = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, len-1)));

      *of_type = target;

      if (m2_get_discrete_bounds (target, &l2, &h2) >= 0)

        return (l1 == l2 && h1 == h2);

      error (_("long_set failed to find discrete bounds for its subtype"));

      return 0;

    }

  error (_("expecting long_set"));

  return 0;

}

static int

m2_long_set (struct type *type, struct ui_file *stream, int show, int level)

{

  struct type *of_type;

  int i;

  int len = TYPE_NFIELDS (type);

  LONGEST low;

  LONGEST high;

  if (m2_is_long_set (type))

    {

      if (TYPE_TAG_NAME (type) != NULL)

        {

          fputs_filtered (TYPE_TAG_NAME (type), stream);

          if (show == 0)

            return 1;

        }

      else if (TYPE_NAME (type) != NULL)

        {

          fputs_filtered (TYPE_NAME (type), stream);

          if (show == 0)

            return 1;

        }

      if (TYPE_TAG_NAME (type) != NULL || TYPE_NAME (type) != NULL)

        fputs_filtered (" = ", stream);

      if (get_long_set_bounds (type, &low, &high))

        {

          fprintf_filtered(stream, "SET OF ");

          i = TYPE_N_BASECLASSES (type);

          if (m2_is_long_set_of_type (type, &of_type))

            m2_print_type (of_type, "", stream, show - 1, level);

          else

            {

              fprintf_filtered(stream, "[");

              m2_print_bounds (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)),

                               stream, show - 1, level, 0);

              fprintf_filtered(stream, "..");

              m2_print_bounds (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, len-1)),

                               stream, show - 1, level, 1);

              fprintf_filtered(stream, "]");

            }

        }

      else

        /* i18n: Do not translate the "SET OF" part! */

        fprintf_filtered(stream, _("SET OF <unknown>"));

      return 1;

    }

  return 0;

}

/* m2_is_unbounded_array - returns TRUE if, type, should be regarded

                           as a Modula-2 unbounded ARRAY type.  */

int

m2_is_unbounded_array (struct type *type)

{

  if (TYPE_CODE (type) == TYPE_CODE_STRUCT)

    {

      /*

       *  check if we have a structure with exactly two fields named

       *  _m2_contents and _m2_high.  It also checks to see if the

       *  type of _m2_contents is a pointer.  The TYPE_TARGET_TYPE

       *  of the pointer determines the unbounded ARRAY OF type.

       */

      if (TYPE_NFIELDS (type) != 2)

        return 0;

      if (strcmp (TYPE_FIELD_NAME (type, 0), "_m2_contents") != 0)

        return 0;

      if (strcmp (TYPE_FIELD_NAME (type, 1), "_m2_high") != 0)

        return 0;

      if (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) != TYPE_CODE_PTR)

        return 0;

      return 1;

    }

  return 0;

}

/* m2_unbounded_array - if the struct type matches a Modula-2 unbounded

                        parameter type then display the type as an

                        ARRAY OF type.  Returns TRUE if an unbounded

                        array type was detected.  */

static int

m2_unbounded_array (struct type *type, struct ui_file *stream, int show,

                    int level)

{

  if (m2_is_unbounded_array (type))

    {

      if (show > 0)

        {

          fputs_filtered ("ARRAY OF ", stream);

          m2_print_type (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)),

                         "", stream, 0, level);

        }

      return 1;

    }

  return 0;

}

void

m2_record_fields (struct type *type, struct ui_file *stream, int show,

                  int level)

{

  /* Print the tag if it exists.  */

  if (TYPE_TAG_NAME (type) != NULL)

    {

      if (strncmp (TYPE_TAG_NAME (type), "$$", 2) != 0)

        {

          fputs_filtered (TYPE_TAG_NAME (type), stream);

          if (show > 0)

            fprintf_filtered (stream, " = ");

        }

    }

  wrap_here ("    ");

  if (show < 0)

    {

      if (TYPE_CODE (type) == TYPE_CODE_STRUCT)

        fprintf_filtered (stream, "RECORD ... END ");

      else if (TYPE_CODE (type) == TYPE_CODE_UNION)

        fprintf_filtered (stream, "CASE ... END ");

    }

  else if (show > 0)

    {

      int i;

      int len = TYPE_NFIELDS (type);

      if (TYPE_CODE (type) == TYPE_CODE_STRUCT)

        fprintf_filtered (stream, "RECORD\n");

      else if (TYPE_CODE (type) == TYPE_CODE_UNION)

        /* i18n: Do not translate "CASE" and "OF" */

        fprintf_filtered (stream, _("CASE <variant> OF\n"));

      for (i = TYPE_N_BASECLASSES (type); i < len; i++)

        {

          QUIT;

          print_spaces_filtered (level + 4, stream);

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

          fputs_filtered (" : ", stream);

          m2_print_type (TYPE_FIELD_TYPE (type, i),

                         "",

                         stream, 0, level + 4);

          if (TYPE_FIELD_PACKED (type, i))

            {

              /* It is a bitfield.  This code does not attempt

                 to look at the bitpos and reconstruct filler,

                 unnamed fields.  This would lead to misleading

                 results if the compiler does not put out fields

                 for such things (I don't know what it does).  */

              fprintf_filtered (stream, " : %d",

                                TYPE_FIELD_BITSIZE (type, i));

            }

          fprintf_filtered (stream, ";\n");

        }

      fprintfi_filtered (level, stream, "END ");

    }

}

void

m2_enum (struct type *type, struct ui_file *stream, int show, int level)

{

  int lastval, i, len;

  if (show < 0)

    {

      /* If we just printed a tag name, no need to print anything else.  */

      if (TYPE_TAG_NAME (type) == NULL)

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

    }

  else if (show > 0 || TYPE_TAG_NAME (type) == NULL)

    {

      fprintf_filtered (stream, "(");

      len = TYPE_NFIELDS (type);

      lastval = 0;

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

        {

          QUIT;

          if (i > 0)

            fprintf_filtered (stream, ", ");

          wrap_here ("    ");

          fputs_filtered (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++;

        }

      fprintf_filtered (stream, ")");

    }

}