From 4c9c95b6a0ac8aa31abb1f7ab48c3f645c059bd6 Mon Sep 17 00:00:00 2001
From: David Monniaux <david.monniaux@univ-grenoble-alpes.fr>
Date: Wed, 20 Mar 2019 17:32:00 +0100
Subject: ocaml byterunner example

---
 test/monniaux/ocaml/byterun/stacks.c | 119 +++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 test/monniaux/ocaml/byterun/stacks.c

(limited to 'test/monniaux/ocaml/byterun/stacks.c')

diff --git a/test/monniaux/ocaml/byterun/stacks.c b/test/monniaux/ocaml/byterun/stacks.c
new file mode 100644
index 00000000..d6e7f53c
--- /dev/null
+++ b/test/monniaux/ocaml/byterun/stacks.c
@@ -0,0 +1,119 @@
+/**************************************************************************/
+/*                                                                        */
+/*                                 OCaml                                  */
+/*                                                                        */
+/*             Xavier Leroy, projet Cristal, 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 Lesser General Public License version 2.1, with the          */
+/*   special exception on linking described in the file LICENSE.          */
+/*                                                                        */
+/**************************************************************************/
+
+#define CAML_INTERNALS
+
+/* To initialize and resize the stacks */
+
+#include <string.h>
+#include "caml/config.h"
+#include "caml/fail.h"
+#include "caml/misc.h"
+#include "caml/mlvalues.h"
+#include "caml/stacks.h"
+
+CAMLexport value * caml_stack_low;
+CAMLexport value * caml_stack_high;
+CAMLexport value * caml_stack_threshold;
+CAMLexport value * caml_extern_sp;
+CAMLexport value * caml_trapsp;
+CAMLexport value * caml_trap_barrier;
+value caml_global_data = 0;
+
+uintnat caml_max_stack_size;            /* also used in gc_ctrl.c */
+
+void caml_init_stack (uintnat initial_max_size)
+{
+  caml_stack_low = (value *) caml_stat_alloc(Stack_size);
+  caml_stack_high = caml_stack_low + Stack_size / sizeof (value);
+  caml_stack_threshold = caml_stack_low + Stack_threshold / sizeof (value);
+  caml_extern_sp = caml_stack_high;
+  caml_trapsp = caml_stack_high;
+  caml_trap_barrier = caml_stack_high + 1;
+  caml_max_stack_size = initial_max_size;
+  caml_gc_message (0x08, "Initial stack limit: %"
+                   ARCH_INTNAT_PRINTF_FORMAT "uk bytes\n",
+                   caml_max_stack_size / 1024 * sizeof (value));
+}
+
+void caml_realloc_stack(asize_t required_space)
+{
+  asize_t size;
+  value * new_low, * new_high, * new_sp;
+  value * p;
+
+  CAMLassert(caml_extern_sp >= caml_stack_low);
+  size = caml_stack_high - caml_stack_low;
+  do {
+    if (size >= caml_max_stack_size) caml_raise_stack_overflow();
+    size *= 2;
+  } while (size < caml_stack_high - caml_extern_sp + required_space);
+  caml_gc_message (0x08, "Growing stack to %"
+                         ARCH_INTNAT_PRINTF_FORMAT "uk bytes\n",
+                   (uintnat) size * sizeof(value) / 1024);
+  new_low = (value *) caml_stat_alloc(size * sizeof(value));
+  new_high = new_low + size;
+
+#define shift(ptr) \
+    ((char *) new_high - ((char *) caml_stack_high - (char *) (ptr)))
+
+  new_sp = (value *) shift(caml_extern_sp);
+  memmove((char *) new_sp,
+          (char *) caml_extern_sp,
+          (caml_stack_high - caml_extern_sp) * sizeof(value));
+  caml_stat_free(caml_stack_low);
+  caml_trapsp = (value *) shift(caml_trapsp);
+  caml_trap_barrier = (value *) shift(caml_trap_barrier);
+  for (p = caml_trapsp; p < new_high; p = Trap_link(p))
+    Trap_link(p) = (value *) shift(Trap_link(p));
+  caml_stack_low = new_low;
+  caml_stack_high = new_high;
+  caml_stack_threshold = caml_stack_low + Stack_threshold / sizeof (value);
+  caml_extern_sp = new_sp;
+
+#undef shift
+}
+
+CAMLprim value caml_ensure_stack_capacity(value required_space)
+{
+  asize_t req = Long_val(required_space);
+  if (caml_extern_sp - req < caml_stack_low) caml_realloc_stack(req);
+  return Val_unit;
+}
+
+void caml_change_max_stack_size (uintnat new_max_size)
+{
+  asize_t size = caml_stack_high - caml_extern_sp
+                 + Stack_threshold / sizeof (value);
+
+  if (new_max_size < size) new_max_size = size;
+  if (new_max_size != caml_max_stack_size){
+    caml_gc_message (0x08, "Changing stack limit to %"
+                     ARCH_INTNAT_PRINTF_FORMAT "uk bytes\n",
+                     new_max_size * sizeof (value) / 1024);
+  }
+  caml_max_stack_size = new_max_size;
+}
+
+CAMLexport uintnat (*caml_stack_usage_hook)(void) = NULL;
+
+uintnat caml_stack_usage(void)
+{
+  uintnat sz;
+  sz = caml_stack_high - caml_extern_sp;
+  if (caml_stack_usage_hook != NULL)
+    sz += (*caml_stack_usage_hook)();
+  return sz;
+}
-- 
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