102 lines
3.3 KiB
C
102 lines
3.3 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 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. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* To initialize and resize the stacks */
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#include <string.h>
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#include "config.h"
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#include "fail.h"
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#include "misc.h"
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#include "mlvalues.h"
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#include "stacks.h"
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CAMLexport value * stack_low;
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CAMLexport value * stack_high;
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CAMLexport value * stack_threshold;
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CAMLexport value * extern_sp;
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CAMLexport value * trapsp;
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CAMLexport value * trap_barrier;
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value global_data;
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unsigned long max_stack_size; /* also used in gc_ctrl.c */
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void init_stack (long unsigned int initial_max_size)
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{
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stack_low = (value *) stat_alloc(Stack_size);
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stack_high = stack_low + Stack_size / sizeof (value);
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stack_threshold = stack_low + Stack_threshold / sizeof (value);
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extern_sp = stack_high;
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trapsp = stack_high;
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trap_barrier = stack_high + 1;
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max_stack_size = initial_max_size;
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gc_message (0x08, "Initial stack limit: %luk bytes\n",
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max_stack_size / 1024 * sizeof (value));
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}
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void realloc_stack(asize_t required_space)
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{
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asize_t size;
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value * new_low, * new_high, * new_sp;
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value * p;
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Assert(extern_sp >= stack_low);
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size = stack_high - stack_low;
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do {
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if (size >= max_stack_size) raise_stack_overflow();
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size *= 2;
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} while (size < stack_high - extern_sp + required_space);
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gc_message (0x08, "Growing stack to %luk bytes\n",
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(unsigned long) size * sizeof(value) / 1024);
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new_low = (value *) stat_alloc(size * sizeof(value));
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new_high = new_low + size;
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#define shift(ptr) \
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((char *) new_high - ((char *) stack_high - (char *) (ptr)))
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new_sp = (value *) shift(extern_sp);
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memmove((char *) new_sp,
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(char *) extern_sp,
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(stack_high - extern_sp) * sizeof(value));
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stat_free(stack_low);
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trapsp = (value *) shift(trapsp);
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trap_barrier = (value *) shift(trap_barrier);
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for (p = trapsp; p < new_high; p = Trap_link(p))
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Trap_link(p) = (value *) shift(Trap_link(p));
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stack_low = new_low;
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stack_high = new_high;
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stack_threshold = stack_low + Stack_threshold / sizeof (value);
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extern_sp = new_sp;
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#undef shift
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}
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CAMLprim value ensure_stack_capacity(value required_space)
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{
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asize_t req = Long_val(required_space);
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if (extern_sp - req < stack_low) realloc_stack(req);
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return Val_unit;
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}
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void change_max_stack_size (long unsigned int new_max_size)
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{
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asize_t size = stack_high - extern_sp + Stack_threshold / sizeof (value);
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if (new_max_size < size) new_max_size = size;
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if (new_max_size != max_stack_size){
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gc_message (0x08, "Changing stack limit to %luk bytes\n",
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new_max_size * sizeof (value) / 1024);
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}
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max_stack_size = new_max_size;
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}
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