77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Damien Doligez, projet Para, INRIA Rocquencourt */
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/* */
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/* Copyright 1997 Institut National de Recherche en Informatique et */
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/* Automatique. Distributed only by permission. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* Operations on weak arrays */
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#include "alloc.h"
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#include "fail.h"
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#include "memory.h"
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#include "mlvalues.h"
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value weak_list_head = 0;
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value weak_create (value len) /* ML */
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{
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mlsize_t size, i;
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value res;
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size = Long_val (len) + 1;
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if (size > Max_wosize) invalid_argument ("Weak.create");
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res = alloc_shr (size, Abstract_tag);
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for (i = 1; i < size; i++) Field (res, i) = 0;
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Field (res, 0) = weak_list_head;
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weak_list_head = res;
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return res;
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}
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#define None_val 1
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#define Some_tag 0
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value weak_set (value ar, value n, value el) /* ML */
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{
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mlsize_t offset = Long_val (n) + 1;
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Assert (Is_in_heap (ar));
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if (offset < 1 || offset >= Wosize_val (ar)) invalid_argument ("Weak.set");
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Field (ar, offset) = 0;
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if (el != None_val){ Assert (Wosize_val (el) == 1);
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Modify (&Field (ar, offset), Field (el, 0));
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}
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return Val_unit;
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}
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#define Setup_for_gc
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#define Restore_after_gc
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value weak_get (value ar, value n) /* ML */
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{
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mlsize_t offset = Long_val (n) + 1;
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value res;
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value elt;
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Assert (Is_in_heap (ar));
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if (offset < 1 || offset >= Wosize_val (ar)) invalid_argument ("Weak.get");
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if (Field (ar, offset) == 0){
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res = None_val;
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}else{
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elt = Field (ar, offset);
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if (gc_phase == Phase_mark) darken (elt, NULL);
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Begin_root(elt);
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res = alloc (1, Some_tag);
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End_roots ();
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Field (res, 0) = elt;
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}
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return res;
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}
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#undef Setup_for_gc
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#undef Restore_after_gc
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