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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"
#include "caml/tsan.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 */
CAMLnoret extern
void caml_raise_exception (caml_domain_state* state, value bucket);
void caml_raise(value v)
{
Caml_check_caml_state();
char* exception_pointer;
CAMLassert(!Is_exception_result(v));
caml_channel_cleanup_on_raise();
caml_result result = caml_process_pending_actions_with_root_res(v);
/* If the result is a value, we want to assign it to [v].
If the result is an exception, we want to raise it instead of [v].
The line below does both these things at once. */
v = result.data;
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;
}
#if defined(WITH_THREAD_SANITIZER)
caml_tsan_exit_on_raise_c(exception_pointer);
#endif
caml_raise_exception(Caml_state, v);
}
value caml_exception_failure(char const *msg)
{
return caml_exception_with_string((value)caml_exn_Failure, msg);
}
value caml_exception_failure_value(value msg)
{
return caml_exception_with_arg((value)caml_exn_Failure, msg);
}
value caml_exception_invalid_argument(char const *msg)
{
return caml_exception_with_string((value)caml_exn_Invalid_argument, msg);
}
value caml_exception_invalid_argument_value(value msg)
{
return caml_exception_with_arg((value)caml_exn_Invalid_argument, msg);
}
value caml_exception_out_of_memory(void)
{
return (value)caml_exn_Out_of_memory;
}
/* Used by the stack overflow handler -> deactivate ASAN (see
segv_handler in signals_nat.c). */
CAMLno_asan
value caml_exception_stack_overflow(void)
{
return (value)caml_exn_Stack_overflow;
}
value caml_exception_sys_error(value msg)
{
return caml_exception_with_arg((value)caml_exn_Sys_error, msg);
}
value caml_exception_end_of_file(void)
{
return (value)caml_exn_End_of_file;
}
value caml_exception_zero_divide(void)
{
return (value)caml_exn_Division_by_zero;
}
value caml_exception_not_found(void)
{
return (value)caml_exn_Not_found;
}
value caml_exception_sys_blocked_io(void)
{
return (value)caml_exn_Sys_blocked_io;
}
/* 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]). */
value caml_exception_array_bound_error(void)
{
static _Atomic(const value *) exn_cache = NULL;
const value *exn = atomic_load_acquire(&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_release(&exn_cache, exn);
}
return *exn;
}
void caml_array_bound_error_asm(void)
{
#if defined(WITH_THREAD_SANITIZER)
char* exception_pointer = (char*)Caml_state->c_stack;
caml_tsan_exit_on_raise_c(exception_pointer);
#endif
/* 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, caml_exception_array_bound_error());
}
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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