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author | David Monniaux <david.monniaux@univ-grenoble-alpes.fr> | 2020-03-03 08:17:40 +0100 |
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committer | David Monniaux <david.monniaux@univ-grenoble-alpes.fr> | 2020-03-03 08:17:40 +0100 |
commit | 1ab7b51c30e1b10ac45b0bd64cefdc01da0f7f68 (patch) | |
tree | 210ffc156c83f04fb0c61a40b4f9037d7ba8a7e1 /test/monniaux/ocaml/byterun/stacks.c | |
parent | 222c9047d61961db9c6b19fed5ca49829223fd33 (diff) | |
parent | 12be46d59a2483a10d77fa8ee67f7e0ca1bd702f (diff) | |
download | compcert-kvx-1ab7b51c30e1b10ac45b0bd64cefdc01da0f7f68.tar.gz compcert-kvx-1ab7b51c30e1b10ac45b0bd64cefdc01da0f7f68.zip |
Merge branch 'mppa-cse2' of gricad-gitlab.univ-grenoble-alpes.fr:sixcy/CompCert into mppa-work
Diffstat (limited to 'test/monniaux/ocaml/byterun/stacks.c')
-rw-r--r-- | test/monniaux/ocaml/byterun/stacks.c | 119 |
1 files changed, 119 insertions, 0 deletions
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; +} |