115 lines
3.5 KiB
C
115 lines
3.5 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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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License, with */
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/* the special exception on linking described in file ../LICENSE. */
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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 <string.h>
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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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CAMLprim value weak_create (value len)
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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 <= 0 || 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 (Val_int(0))
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#define Some_tag 0
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CAMLprim value weak_set (value ar, value n, value el)
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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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CAMLprim value weak_get (value ar, value n)
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{
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CAMLparam2 (ar, n);
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mlsize_t offset = Long_val (n) + 1;
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CAMLlocal2 (res, 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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res = alloc_small (1, Some_tag);
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Field (res, 0) = elt;
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}
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CAMLreturn (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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CAMLprim value weak_get_copy (value ar, value n)
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{
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CAMLparam2 (ar, n);
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mlsize_t offset = Long_val (n) + 1;
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CAMLlocal2 (res, elt);
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value v; /* Caution: this is NOT a local root. */
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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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v = Field (ar, offset);
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if (v == 0) CAMLreturn (None_val);
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elt = alloc (Wosize_val (v), Tag_val (v)); /* The GC may erase or move v. */
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v = Field (ar, offset);
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if (v == 0) CAMLreturn (None_val);
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if (Tag_val (v) < No_scan_tag){
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mlsize_t i;
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for (i = 0; i < Wosize_val (v); i++){
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Store_field (elt, i, Field (v, i));
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}
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}else{
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memmove (Bp_val (elt), Bp_val (v), Bosize_val (v));
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}
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res = alloc_small (1, Some_tag);
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Field (res, 0) = elt;
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CAMLreturn (res);
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}
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CAMLprim value weak_check (value ar, value n)
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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.get");
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return Val_bool (Field (ar, offset) != 0);
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}
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