ocaml/byterun/config.h

/***********************************************************************/
/*                                                                     */
/*                           Objective Caml                            */
/*                                                                     */
/*         Xavier Leroy and Damien Doligez, INRIA Rocquencourt         */
/*                                                                     */
/*  Copyright 1996 Institut National de Recherche en Informatique et   */
/*  en Automatique.  All rights reserved.  This file is distributed    */
/*  under the terms of the GNU Library General Public License, with    */
/*  the special exception on linking described in file ../LICENSE.     */
/*                                                                     */
/***********************************************************************/

/* $Id$ */

#ifndef CAML_CONFIG_H
#define CAML_CONFIG_H

/* <include ../config/m.h> */
/* <include ../config/s.h> */
/* <private> */
#include "../config/m.h"
#include "../config/s.h"
/* </private> */

#ifndef CAML_NAME_SPACE
#include "compatibility.h"
#endif

/* Types for signed chars, 16-bit integers, 32-bit integers, 64-bit integers */

typedef signed char schar;

typedef short int16;            /* FIXME -- not true on the Cray T3E */
typedef unsigned short uint16;  /* FIXME -- not true on the Cray T3E */

#if SIZEOF_INT == 4
typedef int int32;
typedef unsigned int uint32;
#elif SIZEOF_LONG == 4
typedef long int32;
typedef unsigned long uint32;
#elif SIZEOF_SHORT == 4
typedef short int32;
typedef unsigned short uint32;
#endif

#if defined(ARCH_INT64_TYPE)
typedef ARCH_INT64_TYPE int64;
typedef ARCH_UINT64_TYPE uint64;
#else
#  ifdef ARCH_BIG_ENDIAN
typedef struct { uint32 h, l; } uint64, int64;
#  else
typedef struct { uint32 l, h; } uint64, int64;
#  endif
#endif

/* Endianness of floats */

/* ARCH_FLOAT_ENDIANNESS encodes the byte order of doubles as follows:
   the value [0xabcdefgh] means that the least significant byte of the
   float is at byte offset [a], the next lsb at [b], ..., and the
   most significant byte at [h]. */

#if defined(__arm__)
#define ARCH_FLOAT_ENDIANNESS 0x45670123
#elif defined(ARCH_BIG_ENDIAN)
#define ARCH_FLOAT_ENDIANNESS 0x76543210
#else
#define ARCH_FLOAT_ENDIANNESS 0x01234567
#endif

/* We use threaded code interpretation if the compiler provides labels
   as first-class values (GCC 2.x). */

#if defined(__GNUC__) && __GNUC__ >= 2 && !defined(DEBUG) && !defined (SHRINKED_GNUC) && !defined(CAML_JIT)
#define THREADED_CODE
#endif


/* Do not change this definition. */
#define Page_size (1 << Page_log)

/* Memory model parameters */

/* The size of a page for memory management (in bytes) is [1 << Page_log].
   It must be a multiple of [sizeof (long)]. */
#define Page_log 12             /* A page is 4 kilobytes. */

/* Initial size of stack (bytes). */
#define Stack_size (4096 * sizeof(value))

/* Minimum free size of stack (bytes); below that, it is reallocated. */
#define Stack_threshold (256 * sizeof(value))

/* Default maximum size of the stack (words). */
#define Max_stack_def (256 * 1024)


/* Maximum size of a block allocated in the young generation (words). */
/* Must be > 4 */
#define Max_young_wosize 256


/* Minimum size of the minor zone (words).
   This must be at least [Max_young_wosize + 1]. */
#define Minor_heap_min 4096

/* Maximum size of the minor zone (words).
   Must be greater than or equal to [Minor_heap_min].
*/
#define Minor_heap_max (1 << 28)

/* Default size of the minor zone. (words)  */
#define Minor_heap_def 32768


/* Minimum size increment when growing the heap (words).
   Must be a multiple of [Page_size / sizeof (value)]. */
#define Heap_chunk_min (2 * Page_size / sizeof (value))

/* Default size increment when growing the heap. (words)
   Must be a multiple of [Page_size / sizeof (value)]. */
#define Heap_chunk_def (15 * Page_size)

/* Default initial size of the major heap (words);
   same constraints as for Heap_chunk_def. */
#define Init_heap_def (15 * Page_size)


/* Default speed setting for the major GC.  The heap will grow until
   the dead objects and the free list represent this percentage of the
   total size of live objects. */
#define Percent_free_def 80

/* Default setting for the compacter: 500%
   (i.e. trigger the compacter when 5/6 of the heap is free or garbage)
   This can be set quite high because the overhead is over-estimated
   when fragmentation occurs.
 */
#define Max_percent_free_def 500


#endif /* CAML_CONFIG_H */