120 lines
4.3 KiB
C
120 lines
4.3 KiB
C
/**************************************************************************/
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/* */
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/* OCaml */
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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. */
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/* */
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/* All rights reserved. This file is distributed under the terms of */
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/* the GNU Lesser General Public License version 2.1, with the */
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/* special exception on linking described in the file LICENSE. */
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/* */
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/**************************************************************************/
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#define CAML_INTERNALS
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/* To initialize and resize the stacks */
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#include <string.h>
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#include "caml/config.h"
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#include "caml/fail.h"
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#include "caml/misc.h"
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#include "caml/mlvalues.h"
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#include "caml/stacks.h"
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CAMLexport value * caml_stack_low;
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CAMLexport value * caml_stack_high;
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CAMLexport value * caml_stack_threshold;
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CAMLexport value * caml_extern_sp;
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CAMLexport value * caml_trapsp;
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CAMLexport value * caml_trap_barrier;
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value caml_global_data = 0;
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uintnat caml_max_stack_size; /* also used in gc_ctrl.c */
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void caml_init_stack (uintnat initial_max_size)
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{
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caml_stack_low = (value *) caml_stat_alloc(Stack_size);
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caml_stack_high = caml_stack_low + Stack_size / sizeof (value);
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caml_stack_threshold = caml_stack_low + Stack_threshold / sizeof (value);
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caml_extern_sp = caml_stack_high;
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caml_trapsp = caml_stack_high;
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caml_trap_barrier = caml_stack_high + 1;
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caml_max_stack_size = initial_max_size;
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caml_gc_message (0x08, "Initial stack limit: %"
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ARCH_INTNAT_PRINTF_FORMAT "uk bytes\n",
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caml_max_stack_size / 1024 * sizeof (value));
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}
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void caml_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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CAMLassert(caml_extern_sp >= caml_stack_low);
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size = caml_stack_high - caml_stack_low;
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do {
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if (size >= caml_max_stack_size) caml_raise_stack_overflow();
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size *= 2;
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} while (size < caml_stack_high - caml_extern_sp + required_space);
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caml_gc_message (0x08, "Growing stack to %"
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ARCH_INTNAT_PRINTF_FORMAT "uk bytes\n",
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(uintnat) size * sizeof(value) / 1024);
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new_low = (value *) caml_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 *) caml_stack_high - (char *) (ptr)))
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new_sp = (value *) shift(caml_extern_sp);
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memmove((char *) new_sp,
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(char *) caml_extern_sp,
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(caml_stack_high - caml_extern_sp) * sizeof(value));
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caml_stat_free(caml_stack_low);
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caml_trapsp = (value *) shift(caml_trapsp);
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caml_trap_barrier = (value *) shift(caml_trap_barrier);
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for (p = caml_trapsp; p < new_high; p = Trap_link(p))
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Trap_link(p) = (value *) shift(Trap_link(p));
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caml_stack_low = new_low;
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caml_stack_high = new_high;
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caml_stack_threshold = caml_stack_low + Stack_threshold / sizeof (value);
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caml_extern_sp = new_sp;
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#undef shift
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}
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CAMLprim value caml_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 (caml_extern_sp - req < caml_stack_low) caml_realloc_stack(req);
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return Val_unit;
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}
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void caml_change_max_stack_size (uintnat new_max_size)
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{
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asize_t size = caml_stack_high - caml_extern_sp
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+ 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 != caml_max_stack_size){
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caml_gc_message (0x08, "Changing stack limit to %"
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ARCH_INTNAT_PRINTF_FORMAT "uk bytes\n",
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new_max_size * sizeof (value) / 1024);
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}
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caml_max_stack_size = new_max_size;
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}
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CAMLexport uintnat (*caml_stack_usage_hook)(void) = NULL;
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uintnat caml_stack_usage(void)
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{
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uintnat sz;
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sz = caml_stack_high - caml_extern_sp;
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if (caml_stack_usage_hook != NULL)
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sz += (*caml_stack_usage_hook)();
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return sz;
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}
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