/* -----------------------------------------------------------------------------
 *
 * (c) The University of Glasgow 2002
 * 
 * Definitions that characterise machine specific properties of basic
 * types (C & Haskell).
 *
 * NB: Keep in sync with HsFFI.h and StgTypes.h.
 * NB: THIS FILE IS INCLUDED IN HASKELL SOURCE!
 *
 * To understand the structure of the RTS headers, see the wiki:
 *   http://ghc.haskell.org/trac/ghc/wiki/Commentary/SourceTree/Includes
 *
 * ---------------------------------------------------------------------------*/

#ifndef MACHDEPS_H
#define MACHDEPS_H

/* Sizes of C types come from here... */
#include "ghcautoconf.h"

/* Sizes of Haskell types follow.  These sizes correspond to:
 *   - the number of bytes in the primitive type (eg. Int#)
 *   - the number of bytes in the external representation (eg. HsInt)
 *   - the scale offset used by writeFooOffAddr#
 *
 * In the heap, the type may take up more space: eg. SIZEOF_INT8 == 1,
 * but it takes up SIZEOF_HSWORD (4 or 8) bytes in the heap.
 */

/* First, check some assumptions.. */
#if SIZEOF_CHAR != 1
#error GHC untested on this architecture: sizeof(char) != 1
#endif

#if SIZEOF_SHORT != 2
#error GHC untested on this architecture: sizeof(short) != 2
#endif

#if SIZEOF_UNSIGNED_INT != 4
#error GHC untested on this architecture: sizeof(unsigned int) != 4
#endif

#define SIZEOF_HSCHAR           SIZEOF_WORD32
#define ALIGNMENT_HSCHAR        ALIGNMENT_WORD32

#define SIZEOF_HSINT            SIZEOF_VOID_P
#define ALIGNMENT_HSINT         ALIGNMENT_VOID_P

#define SIZEOF_HSWORD           SIZEOF_VOID_P
#define ALIGNMENT_HSWORD        ALIGNMENT_VOID_P

#define SIZEOF_HSDOUBLE         SIZEOF_DOUBLE
#define ALIGNMENT_HSDOUBLE      ALIGNMENT_DOUBLE

#define SIZEOF_HSFLOAT          SIZEOF_FLOAT
#define ALIGNMENT_HSFLOAT       ALIGNMENT_FLOAT

#define SIZEOF_HSPTR            SIZEOF_VOID_P
#define ALIGNMENT_HSPTR         ALIGNMENT_VOID_P

#define SIZEOF_HSFUNPTR         SIZEOF_VOID_P
#define ALIGNMENT_HSFUNPTR      ALIGNMENT_VOID_P

#define SIZEOF_HSSTABLEPTR      SIZEOF_VOID_P
#define ALIGNMENT_HSSTABLEPTR   ALIGNMENT_VOID_P

#define SIZEOF_INT8             SIZEOF_CHAR
#define ALIGNMENT_INT8          ALIGNMENT_CHAR

#define SIZEOF_WORD8            SIZEOF_UNSIGNED_CHAR
#define ALIGNMENT_WORD8         ALIGNMENT_UNSIGNED_CHAR

#define SIZEOF_INT16            SIZEOF_SHORT
#define ALIGNMENT_INT16         ALIGNMENT_SHORT

#define SIZEOF_WORD16           SIZEOF_UNSIGNED_SHORT
#define ALIGNMENT_WORD16        ALIGNMENT_UNSIGNED_SHORT

#define SIZEOF_INT32            SIZEOF_INT
#define ALIGNMENT_INT32         ALIGNMENT_INT

#define SIZEOF_WORD32           SIZEOF_UNSIGNED_INT
#define ALIGNMENT_WORD32        ALIGNMENT_UNSIGNED_INT

#if SIZEOF_LONG == 8
#define SIZEOF_INT64            SIZEOF_LONG
#define ALIGNMENT_INT64         ALIGNMENT_LONG
#define SIZEOF_WORD64           SIZEOF_UNSIGNED_LONG
#define ALIGNMENT_WORD64        ALIGNMENT_UNSIGNED_LONG
#elif HAVE_LONG_LONG && SIZEOF_LONG_LONG == 8
#define SIZEOF_INT64            SIZEOF_LONG_LONG
#define ALIGNMENT_INT64         ALIGNMENT_LONG_LONG
#define SIZEOF_WORD64           SIZEOF_UNSIGNED_LONG_LONG
#define ALIGNMENT_WORD64        ALIGNMENT_UNSIGNED_LONG_LONG
#else
#error Cannot find a 64bit type.
#endif

#ifndef WORD_SIZE_IN_BITS
#if SIZEOF_HSWORD == 4
#define WORD_SIZE_IN_BITS       32
#define WORD_SIZE_IN_BITS_FLOAT 32.0
#else 
#define WORD_SIZE_IN_BITS       64
#define WORD_SIZE_IN_BITS_FLOAT 64.0
#endif
#endif

#ifndef TAG_BITS
#if SIZEOF_HSWORD == 4
#define TAG_BITS                2
#else 
#define TAG_BITS                3
#endif
#endif

#define TAG_MASK ((1 << TAG_BITS) - 1)

#endif /* MACHDEPS_H */
