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/****************************************************************************

 *                                                                          *

 *                         GNAT COMPILER COMPONENTS                         *

 *                                                                          *

 *                            T A R G T Y P S                               *

 *                                                                          *

 *                                  Body                                    *

 *                                                                          *

 *          Copyright (C) 1992-2009, Free Software Foundation, Inc.         *

 *                                                                          *

 * GNAT is free software;  you can  redistribute it  and/or modify it under *

 * terms of the  GNU General Public License as published  by the Free Soft- *

 * ware  Foundation;  either version 3,  or (at your option) any later ver- *

 * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *

 * OUT 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  distributed  with GNAT;  see file  COPYING3.  If not see *

 * <http://www.gnu.org/licenses/>.                                          *

 *                                                                          *

 * GNAT was originally developed  by the GNAT team at  New York University. *

 * Extensive contributions were provided by Ada Core Technologies Inc.      *

 *                                                                          *

 ****************************************************************************/

/* Functions for retrieving target types. See Ada package Get_Targ */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tree.h"

#include "tm.h"

#include "tm_p.h"

#include "ada.h"

#include "types.h"

#include "atree.h"

#include "elists.h"

#include "namet.h"

#include "nlists.h"

#include "snames.h"

#include "stringt.h"

#include "uintp.h"

#include "urealp.h"

#include "fe.h"

#include "sinfo.h"

#include "einfo.h"

#include "ada-tree.h"

#include "gigi.h"

/* If we don't have a specific size for Ada's equivalent of `long', use that

   of C.  */

#ifndef ADA_LONG_TYPE_SIZE

#define ADA_LONG_TYPE_SIZE LONG_TYPE_SIZE

#endif

#ifndef WIDEST_HARDWARE_FP_SIZE

#define WIDEST_HARDWARE_FP_SIZE LONG_DOUBLE_TYPE_SIZE

#endif

/* The following provide a functional interface for the front end Ada code

   to determine the sizes that are used for various C types. */

Pos

get_target_bits_per_unit (void)

{

  return BITS_PER_UNIT;

}

Pos

get_target_bits_per_word (void)

{

  return BITS_PER_WORD;

}

Pos

get_target_char_size (void)

{

  return CHAR_TYPE_SIZE;

}

Pos

get_target_wchar_t_size (void)

{

  /* We never want wide characters less than "short" in Ada.  */

  return MAX (SHORT_TYPE_SIZE, WCHAR_TYPE_SIZE);

}

Pos

get_target_short_size (void)

{

  return SHORT_TYPE_SIZE;

}

Pos

get_target_int_size (void)

{

  return INT_TYPE_SIZE;

}

Pos

get_target_long_size (void)

{

  return ADA_LONG_TYPE_SIZE;

}

Pos

get_target_long_long_size (void)

{

  return LONG_LONG_TYPE_SIZE;

}

Pos

get_target_float_size (void)

{

  return fp_prec_to_size (FLOAT_TYPE_SIZE);

}

Pos

get_target_double_size (void)

{

  return fp_prec_to_size (DOUBLE_TYPE_SIZE);

}

Pos

get_target_long_double_size (void)

{

  return fp_prec_to_size (WIDEST_HARDWARE_FP_SIZE);

}

Pos

get_target_pointer_size (void)

{

  return POINTER_SIZE;

}

/* Alignment related values, mapped to attributes for functional and

   documentation purposes.  */

/* Standard'Maximum_Default_Alignment.  Maximum alignment that the compiler

   might choose by default for a type or object.

   Stricter alignment requests trigger gigi's aligning_type circuitry for

   stack objects or objects allocated by the default allocator.  */

Pos

get_target_maximum_default_alignment (void)

{

  return BIGGEST_ALIGNMENT / BITS_PER_UNIT;

}

/* Standard'Default_Allocator_Alignment.  Alignment guaranteed to be honored

   by the default allocator (System.Memory.Alloc or malloc if we have no

   run-time library at hand).

   Stricter alignment requests trigger gigi's aligning_type circuitry for

   objects allocated by the default allocator.  */

/* ??? Need a way to get info about __gnat_malloc from here (whether it is

   handy and what alignment it honors).  In the meantime, resort to malloc

   considerations only.  */

/* Account for MALLOC_OBSERVABLE_ALIGNMENTs here.  Use this or the ABI

   guaranteed alignment if greater.  */

#ifdef MALLOC_OBSERVABLE_ALIGNMENT

#define MALLOC_ALIGNMENT MALLOC_OBSERVABLE_ALIGNMENT

#else

#define MALLOC_OBSERVABLE_ALIGNMENT (2 * LONG_TYPE_SIZE)

#define MALLOC_ALIGNMENT \

  MAX (MALLOC_ABI_ALIGNMENT, MALLOC_OBSERVABLE_ALIGNMENT)

#endif

Pos

get_target_default_allocator_alignment (void)

{

  return MALLOC_ALIGNMENT / BITS_PER_UNIT;

}

/* Standard'Maximum_Allowed_Alignment.  Maximum alignment that we may

   accept for any type or object.  */

#ifndef MAX_OFILE_ALIGNMENT

#define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT

#endif

Pos

get_target_maximum_allowed_alignment (void)

{

  return MAX_OFILE_ALIGNMENT / BITS_PER_UNIT;

}

/* Standard'Maximum_Alignment.  The single attribute initially made

   available, now a synonym of Standard'Maximum_Default_Alignment.  */

Pos

get_target_maximum_alignment (void)

{

  return get_target_maximum_default_alignment ();

}

#ifndef FLOAT_WORDS_BIG_ENDIAN

#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN

#endif

Nat

get_float_words_be (void)

{

  return FLOAT_WORDS_BIG_ENDIAN;

}

Nat

get_words_be (void)

{

  return WORDS_BIG_ENDIAN;

}

Nat

get_bytes_be (void)

{

  return BYTES_BIG_ENDIAN;

}

Nat

get_bits_be (void)

{

  return BITS_BIG_ENDIAN;

}

Nat

get_target_strict_alignment (void)

{

  return STRICT_ALIGNMENT;

}

Nat

get_target_double_float_alignment (void)

{

#ifdef TARGET_ALIGN_NATURAL

  /* This macro is only defined by the rs6000 port.  */

  if (!TARGET_ALIGN_NATURAL

      && (DEFAULT_ABI == ABI_AIX || DEFAULT_ABI == ABI_DARWIN))

    return 32 / BITS_PER_UNIT;

#endif

  return 0;

}

Nat

get_target_double_scalar_alignment (void)

{

#ifdef TARGET_ALIGN_DOUBLE

  /* This macro is only defined by the i386 port.  */

  if (!TARGET_ALIGN_DOUBLE && !TARGET_64BIT)

    return 32 / BITS_PER_UNIT;

#endif

  return 0;

}