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/**************************************************************************/
/* */
/* 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
/* Raising exceptions from C. */
#include <stdio.h>
#include <signal.h>
#include "caml/alloc.h"
#include "caml/fail.h"
#include "caml/io.h"
#include "caml/gc.h"
#include "caml/memory.h"
#include "caml/mlvalues.h"
#include "caml/printexc.h"
#include "caml/signals.h"
#include "caml/stack.h"
#include "caml/roots.h"
#include "caml/callback.h"
#include "caml/signals.h"
/* The globals holding predefined exceptions */
typedef value caml_generated_constant[1];
extern caml_generated_constant
caml_exn_Out_of_memory,
caml_exn_Sys_error,
caml_exn_Failure,
caml_exn_Invalid_argument,
caml_exn_End_of_file,
caml_exn_Division_by_zero,
caml_exn_Not_found,
caml_exn_Match_failure,
caml_exn_Sys_blocked_io,
caml_exn_Stack_overflow,
caml_exn_Assert_failure,
caml_exn_Undefined_recursive_module;
/* Exception raising */
CAMLnoreturn_start
extern void caml_raise_exception (caml_domain_state* state, value bucket)
CAMLnoreturn_end;
void caml_raise(value v)
{
Caml_check_caml_state();
char* exception_pointer;
Unlock_exn();
CAMLassert(!Is_exception_result(v));
// avoid calling caml_raise recursively
v = caml_process_pending_actions_with_root_exn(v);
if (Is_exception_result(v))
v = Extract_exception(v);
exception_pointer = (char*)Caml_state->c_stack;
if (exception_pointer == NULL) {
caml_terminate_signals();
caml_fatal_uncaught_exception(v);
}
while (Caml_state->local_roots != NULL &&
(char *) Caml_state->local_roots < exception_pointer) {
Caml_state->local_roots = Caml_state->local_roots->next;
}
caml_raise_exception(Caml_state, v);
}
/* Used by the stack overflow handler -> deactivate ASAN (see
segv_handler in signals_nat.c). */
CAMLno_asan
void caml_raise_constant(value tag)
{
caml_raise(tag);
}
void caml_raise_with_arg(value tag, value arg)
{
CAMLparam2 (tag, arg);
CAMLlocal1 (bucket);
bucket = caml_alloc_small (2, 0);
Field(bucket, 0) = tag;
Field(bucket, 1) = arg;
caml_raise(bucket);
CAMLnoreturn;
}
void caml_raise_with_args(value tag, int nargs, value args[])
{
CAMLparam1 (tag);
CAMLxparamN (args, nargs);
value bucket;
int i;
bucket = caml_alloc (1 + nargs, 0);
Field(bucket, 0) = tag;
for (i = 0; i < nargs; i++) Field(bucket, 1 + i) = args[i];
caml_raise(bucket);
CAMLnoreturn;
}
void caml_raise_with_string(value tag, char const *msg)
{
CAMLparam1(tag);
value v_msg = caml_copy_string(msg);
caml_raise_with_arg(tag, v_msg);
CAMLnoreturn;
}
void caml_failwith (char const *msg)
{
caml_raise_with_string((value) caml_exn_Failure, msg);
}
void caml_failwith_value (value msg)
{
caml_raise_with_arg((value) caml_exn_Failure, msg);
}
void caml_invalid_argument (char const *msg)
{
caml_raise_with_string((value) caml_exn_Invalid_argument, msg);
}
void caml_invalid_argument_value (value msg)
{
caml_raise_with_arg((value) caml_exn_Invalid_argument, msg);
}
void caml_raise_out_of_memory(void)
{
caml_raise_constant((value) caml_exn_Out_of_memory);
}
/* Used by the stack overflow handler -> deactivate ASAN (see
segv_handler in signals_nat.c). */
CAMLno_asan
void caml_raise_stack_overflow(void)
{
caml_raise_constant((value) caml_exn_Stack_overflow);
}
void caml_raise_sys_error(value msg)
{
caml_raise_with_arg((value) caml_exn_Sys_error, msg);
}
void caml_raise_end_of_file(void)
{
caml_raise_constant((value) caml_exn_End_of_file);
}
void caml_raise_zero_divide(void)
{
caml_raise_constant((value) caml_exn_Division_by_zero);
}
void caml_raise_not_found(void)
{
caml_raise_constant((value) caml_exn_Not_found);
}
void caml_raise_sys_blocked_io(void)
{
caml_raise_constant((value) caml_exn_Sys_blocked_io);
}
CAMLexport value caml_raise_if_exception(value res)
{
if (Is_exception_result(res)) caml_raise(Extract_exception(res));
return res;
}
/* We use a pre-allocated exception because we can't
do a GC before the exception is raised (lack of stack descriptors
for the ccall to [caml_array_bound_error]). */
static value array_bound_exn(void)
{
static atomic_uintnat exn_cache = ATOMIC_UINTNAT_INIT(0);
const value* exn = (const value*)atomic_load_acq(&exn_cache);
if (!exn) {
exn = caml_named_value("Pervasives.array_bound_error");
if (!exn) {
fprintf(stderr, "Fatal error: exception "
"Invalid_argument(\"index out of bounds\")\n");
exit(2);
}
atomic_store_rel(&exn_cache, (uintnat)exn);
}
return *exn;
}
void caml_array_bound_error(void)
{
caml_raise(array_bound_exn());
}
void caml_array_bound_error_asm(void)
{
/* This exception is raised directly from ocamlopt-compiled OCaml,
not C, so we jump directly to the OCaml handler (and avoid GC) */
caml_raise_exception(Caml_state, array_bound_exn());
}
int caml_is_special_exception(value exn) {
return exn == (value) caml_exn_Match_failure
|| exn == (value) caml_exn_Assert_failure
|| exn == (value) caml_exn_Undefined_recursive_module;
}
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