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memory.h

/***********************************************************************/
/*                                                                     */
/*                           Objective Caml                            */
/*                                                                     */
/*             Damien Doligez, projet Para, 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: memory.h,v 1.50.2.2 2004/11/22 11:16:03 doligez Exp $ */

/* Allocation macros and functions */

#ifndef CAML_MEMORY_H
#define CAML_MEMORY_H

#ifndef CAML_NAME_SPACE
#include "compatibility.h"
#endif
#include "config.h"
/* <private> */
#include "gc.h"
#include "major_gc.h"
#include "minor_gc.h"
/* </private> */
#include "misc.h"
#include "mlvalues.h"

CAMLextern value caml_alloc_shr (mlsize_t, tag_t);
CAMLextern void caml_adjust_gc_speed (mlsize_t, mlsize_t);
CAMLextern void caml_alloc_dependent_memory (mlsize_t);
CAMLextern void caml_free_dependent_memory (mlsize_t);
CAMLextern void caml_modify (value *, value);
CAMLextern void caml_initialize (value *, value);
CAMLextern value caml_check_urgent_gc (value);
CAMLextern void * caml_stat_alloc (asize_t);              /* Size in bytes. */
CAMLextern void caml_stat_free (void *);
CAMLextern void * caml_stat_resize (void *, asize_t);     /* Size in bytes. */
char *caml_alloc_for_heap (asize_t request);   /* Size in bytes. */
void caml_free_for_heap (char *mem);
int caml_add_to_heap (char *mem);
color_t caml_allocation_color (void *hp);

/* void caml_shrink_heap (char *);        Only used in compact.c */

/* <private> */

#ifdef DEBUG
#define DEBUG_clear(result, wosize) do{ \
  unsigned long caml__DEBUG_i; \
  for (caml__DEBUG_i = 0; caml__DEBUG_i < (wosize); ++ caml__DEBUG_i){ \
    Field ((result), caml__DEBUG_i) = Debug_uninit_minor; \
  } \
}while(0)
#else
#define DEBUG_clear(result, wosize)
#endif

#define Alloc_small(result, wosize, tag) do{    CAMLassert ((wosize) >= 1); \
                                          CAMLassert ((tag_t) (tag) < 256); \
                                 CAMLassert ((wosize) <= Max_young_wosize); \
  caml_young_ptr -= Bhsize_wosize (wosize);                                 \
  if (caml_young_ptr < caml_young_limit){                                   \
    caml_young_ptr += Bhsize_wosize (wosize);                               \
    Setup_for_gc;                                                           \
    caml_minor_collection ();                                               \
    Restore_after_gc;                                                       \
    caml_young_ptr -= Bhsize_wosize (wosize);                               \
  }                                                                         \
  Hd_hp (caml_young_ptr) = Make_header ((wosize), (tag), Caml_black);       \
  (result) = Val_hp (caml_young_ptr);                                       \
  DEBUG_clear ((result), (wosize));                                         \
}while(0)

/* You must use [Modify] to change a field of an existing shared block,
   unless you are sure the value being overwritten is not a shared block and
   the value being written is not a young block. */
/* [Modify] never calls the GC. */
/* [Modify] can also be used to do assignment on data structures that are
   not in the (major) heap.  In this case, it is a bit slower than
   simple assignment.
   In particular, you can use [Modify] when you don't know whether the
   block being changed is in the minor heap or the major heap.
*/

#define Modify(fp, val) do{                                                 \
  value _old_ = *(fp);                                                      \
  *(fp) = (val);                                                            \
  if (Is_in_heap (fp)){                                                     \
    if (caml_gc_phase == Phase_mark) caml_darken (_old_, NULL);             \
    if (Is_block (val) && Is_young (val)                                    \
        && ! (Is_block (_old_) && Is_young (_old_))){                       \
      *caml_ref_table_ptr++ = (fp);                                         \
      if (caml_ref_table_ptr >= caml_ref_table_limit){                      \
        CAMLassert (caml_ref_table_ptr == caml_ref_table_limit);            \
        caml_realloc_ref_table ();                                          \
      }                                                                     \
    }                                                                       \
  }                                                                         \
}while(0)

/* </private> */

struct caml__roots_block {
  struct caml__roots_block *next;
  long ntables;
  long nitems;
  value *tables [5];
};

CAMLextern struct caml__roots_block *caml_local_roots;  /* defined in roots.c */

/* The following macros are used to declare C local variables and
   function parameters of type [value].

   The function body must start with one of the [CAMLparam] macros.
   If the function has no parameter of type [value], use [CAMLparam0].
   If the function has 1 to 5 [value] parameters, use the corresponding
   [CAMLparam] with the parameters as arguments.
   If the function has more than 5 [value] parameters, use [CAMLparam5]
   for the first 5 parameters, and one or more calls to the [CAMLxparam]
   macros for the others.
   If the function takes an array of [value]s as argument, use
   [CAMLparamN] to declare it (or [CAMLxparamN] if you already have a
   call to [CAMLparam] for some other arguments).

   If you need local variables of type [value], declare them with one
   or more calls to the [CAMLlocal] macros at the beginning of the
   function. Use [CAMLlocalN] (at the beginning of the function) to
   declare an array of [value]s.

   Your function may raise an exception or return a [value] with the
   [CAMLreturn] macro.  Its argument is simply the [value] returned by
   your function.  Do NOT directly return a [value] with the [return]
   keyword.  If your function returns void, use [CAMLreturn0].

   All the identifiers beginning with "caml__" are reserved by Caml.
   Do not use them for anything (local or global variables, struct or
   union tags, macros, etc.)
*/

#define CAMLparam0() \
  struct caml__roots_block *caml__frame = caml_local_roots

#define CAMLparam1(x) \
  CAMLparam0 (); \
  CAMLxparam1 (x)

#define CAMLparam2(x, y) \
  CAMLparam0 (); \
  CAMLxparam2 (x, y)

#define CAMLparam3(x, y, z) \
  CAMLparam0 (); \
  CAMLxparam3 (x, y, z)

#define CAMLparam4(x, y, z, t) \
  CAMLparam0 (); \
  CAMLxparam4 (x, y, z, t)

#define CAMLparam5(x, y, z, t, u) \
  CAMLparam0 (); \
  CAMLxparam5 (x, y, z, t, u)

#define CAMLparamN(x, size) \
  CAMLparam0 (); \
  CAMLxparamN (x, (size))


#if defined (__GNUC__)
  #define CAMLunused __attribute__ ((unused))
#else
  #define CAMLunused
#endif

#define CAMLxparam1(x) \
  struct caml__roots_block caml__roots_##x; \
  CAMLunused int caml__dummy_##x = ( \
    (caml__roots_##x.next = caml_local_roots), \
    (caml_local_roots = &caml__roots_##x), \
    (caml__roots_##x.nitems = 1), \
    (caml__roots_##x.ntables = 1), \
    (caml__roots_##x.tables [0] = &x), \
    0)

#define CAMLxparam2(x, y) \
  struct caml__roots_block caml__roots_##x; \
  CAMLunused int caml__dummy_##x = ( \
    (caml__roots_##x.next = caml_local_roots), \
    (caml_local_roots = &caml__roots_##x), \
    (caml__roots_##x.nitems = 1), \
    (caml__roots_##x.ntables = 2), \
    (caml__roots_##x.tables [0] = &x), \
    (caml__roots_##x.tables [1] = &y), \
    0)

#define CAMLxparam3(x, y, z) \
  struct caml__roots_block caml__roots_##x; \
  CAMLunused int caml__dummy_##x = ( \
    (caml__roots_##x.next = caml_local_roots), \
    (caml_local_roots = &caml__roots_##x), \
    (caml__roots_##x.nitems = 1), \
    (caml__roots_##x.ntables = 3), \
    (caml__roots_##x.tables [0] = &x), \
    (caml__roots_##x.tables [1] = &y), \
    (caml__roots_##x.tables [2] = &z), \
    0)

#define CAMLxparam4(x, y, z, t) \
  struct caml__roots_block caml__roots_##x; \
  CAMLunused int caml__dummy_##x = ( \
    (caml__roots_##x.next = caml_local_roots), \
    (caml_local_roots = &caml__roots_##x), \
    (caml__roots_##x.nitems = 1), \
    (caml__roots_##x.ntables = 4), \
    (caml__roots_##x.tables [0] = &x), \
    (caml__roots_##x.tables [1] = &y), \
    (caml__roots_##x.tables [2] = &z), \
    (caml__roots_##x.tables [3] = &t), \
    0)

#define CAMLxparam5(x, y, z, t, u) \
  struct caml__roots_block caml__roots_##x; \
  CAMLunused int caml__dummy_##x = ( \
    (caml__roots_##x.next = caml_local_roots), \
    (caml_local_roots = &caml__roots_##x), \
    (caml__roots_##x.nitems = 1), \
    (caml__roots_##x.ntables = 5), \
    (caml__roots_##x.tables [0] = &x), \
    (caml__roots_##x.tables [1] = &y), \
    (caml__roots_##x.tables [2] = &z), \
    (caml__roots_##x.tables [3] = &t), \
    (caml__roots_##x.tables [4] = &u), \
    0)

#define CAMLxparamN(x, size) \
  struct caml__roots_block caml__roots_##x; \
  CAMLunused int caml__dummy_##x = ( \
    (caml__roots_##x.next = caml_local_roots), \
    (caml_local_roots = &caml__roots_##x), \
    (caml__roots_##x.nitems = (size)), \
    (caml__roots_##x.ntables = 1), \
    (caml__roots_##x.tables[0] = &(x[0])), \
    0)

#define CAMLlocal1(x) \
  value x = 0; \
  CAMLxparam1 (x)

#define CAMLlocal2(x, y) \
  value x = 0, y = 0; \
  CAMLxparam2 (x, y)

#define CAMLlocal3(x, y, z) \
  value x = 0, y = 0, z = 0; \
  CAMLxparam3 (x, y, z)

#define CAMLlocal4(x, y, z, t) \
  value x = 0, y = 0, z = 0, t = 0; \
  CAMLxparam4 (x, y, z, t)

#define CAMLlocal5(x, y, z, t, u) \
  value x = 0, y = 0, z = 0, t = 0, u = 0; \
  CAMLxparam5 (x, y, z, t, u)

#define CAMLlocalN(x, size) \
  value x [(size)] = { 0, /* 0, 0, ... */ }; \
  CAMLxparamN (x, (size))


#define CAMLreturn0 do{ \
  caml_local_roots = caml__frame; \
  return; \
}while (0)

#define CAMLreturn(result) do{ \
  caml_local_roots = caml__frame; \
  return (result); \
}while(0)

#define CAMLnoreturn ((void) caml__frame)


/* convenience macro */
#define Store_field(block, offset, val) do{ \
  mlsize_t caml__temp_offset = (offset); \
  value caml__temp_val = (val); \
  caml_modify (&Field ((block), caml__temp_offset), caml__temp_val); \
}while(0)

/*
   NOTE: [Begin_roots] and [End_roots] are superseded by [CAMLparam]*,
   [CAMLxparam]*, [CAMLlocal]*, [CAMLreturn].

   [Begin_roots] and [End_roots] are used for C variables that are GC roots.
   It must contain all values in C local variables and function parameters
   at the time the minor GC is called.
   Usage:
   After initialising your local variables to legal Caml values, but before
   calling allocation functions, insert [Begin_roots_n(v1, ... vn)], where
   v1 ... vn are your variables of type [value] that you want to be updated
   across allocations.
   At the end, insert [End_roots()].

   Note that [Begin_roots] opens a new block, and [End_roots] closes it.
   Thus they must occur in matching pairs at the same brace nesting level.

   You can use [Val_unit] as a dummy initial value for your variables.
*/

#define Begin_root Begin_roots1

#define Begin_roots1(r0) { \
  struct caml__roots_block caml__roots_block; \
  caml__roots_block.next = caml_local_roots; \
  caml_local_roots = &caml__roots_block; \
  caml__roots_block.nitems = 1; \
  caml__roots_block.ntables = 1; \
  caml__roots_block.tables[0] = &(r0);

#define Begin_roots2(r0, r1) { \
  struct caml__roots_block caml__roots_block; \
  caml__roots_block.next = caml_local_roots; \
  caml_local_roots = &caml__roots_block; \
  caml__roots_block.nitems = 1; \
  caml__roots_block.ntables = 2; \
  caml__roots_block.tables[0] = &(r0); \
  caml__roots_block.tables[1] = &(r1);

#define Begin_roots3(r0, r1, r2) { \
  struct caml__roots_block caml__roots_block; \
  caml__roots_block.next = caml_local_roots; \
  caml_local_roots = &caml__roots_block; \
  caml__roots_block.nitems = 1; \
  caml__roots_block.ntables = 3; \
  caml__roots_block.tables[0] = &(r0); \
  caml__roots_block.tables[1] = &(r1); \
  caml__roots_block.tables[2] = &(r2);

#define Begin_roots4(r0, r1, r2, r3) { \
  struct caml__roots_block caml__roots_block; \
  caml__roots_block.next = caml_local_roots; \
  caml_local_roots = &caml__roots_block; \
  caml__roots_block.nitems = 1; \
  caml__roots_block.ntables = 4; \
  caml__roots_block.tables[0] = &(r0); \
  caml__roots_block.tables[1] = &(r1); \
  caml__roots_block.tables[2] = &(r2); \
  caml__roots_block.tables[3] = &(r3);

#define Begin_roots5(r0, r1, r2, r3, r4) { \
  struct caml__roots_block caml__roots_block; \
  caml__roots_block.next = caml_local_roots; \
  caml_local_roots = &caml__roots_block; \
  caml__roots_block.nitems = 1; \
  caml__roots_block.ntables = 5; \
  caml__roots_block.tables[0] = &(r0); \
  caml__roots_block.tables[1] = &(r1); \
  caml__roots_block.tables[2] = &(r2); \
  caml__roots_block.tables[3] = &(r3); \
  caml__roots_block.tables[4] = &(r4);

#define Begin_roots_block(table, size) { \
  struct caml__roots_block caml__roots_block; \
  caml__roots_block.next = caml_local_roots; \
  caml_local_roots = &caml__roots_block; \
  caml__roots_block.nitems = (size); \
  caml__roots_block.ntables = 1; \
  caml__roots_block.tables[0] = (table);

#define End_roots() caml_local_roots = caml__roots_block.next; }


/* [caml_register_global_root] registers a global C variable as a memory root
   for the duration of the program, or until [caml_remove_global_root] is
   called. */

CAMLextern void caml_register_global_root (value *);

/* [caml_remove_global_root] removes a memory root registered on a global C
   variable with [caml_register_global_root]. */

CAMLextern void caml_remove_global_root (value *);


#endif /* CAML_MEMORY_H */

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