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/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* 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 Library General Public License, with */
/* the special exception on linking described in file ../LICENSE. */
/* */
/***********************************************************************/
/* $Id$ */
/* Raising exceptions from C. */
#include <signal.h>
#include "alloc.h"
#include "fail.h"
#include "io.h"
#include "gc.h"
#include "memory.h"
#include "mlvalues.h"
#include "printexc.h"
#include "signals.h"
#include "stack.h"
#include "roots.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;
extern caml_generated_constant
caml_bucket_Out_of_memory,
caml_bucket_Stack_overflow;
/* Exception raising */
extern void caml_raise_exception (value bucket) Noreturn;
char * caml_exception_pointer = NULL;
void caml_raise(value v)
{
Unlock_exn();
if (caml_exception_pointer == NULL) caml_fatal_uncaught_exception(v);
#ifndef Stack_grows_upwards
#define PUSHED_AFTER <
#else
#define PUSHED_AFTER >
#endif
while (caml_local_roots != NULL &&
(char *) caml_local_roots PUSHED_AFTER caml_exception_pointer) {
caml_local_roots = caml_local_roots->next;
}
#undef PUSHED_AFTER
caml_raise_exception(v);
}
void caml_raise_constant(value tag)
{
CAMLparam1 (tag);
CAMLlocal1 (bucket);
bucket = caml_alloc_small (1, 0);
Field(bucket, 0) = tag;
caml_raise(bucket);
CAMLnoreturn;
}
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;
Assert(1 + nargs <= Max_young_wosize);
bucket = caml_alloc_small (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)
{
caml_raise_with_arg(tag, caml_copy_string(msg));
}
void caml_failwith (char const *msg)
{
caml_raise_with_string((value) caml_exn_Failure, msg);
}
void caml_invalid_argument (char const *msg)
{
caml_raise_with_string((value) caml_exn_Invalid_argument, msg);
}
/* To raise [Out_of_memory], we can't use [caml_raise_constant],
because it allocates and we're out of memory...
We therefore use a statically-allocated bucket constructed
by the ocamlopt linker.
This works OK because the exception value for [Out_of_memory] is also
statically allocated out of the heap.
The same applies to Stack_overflow. */
void caml_raise_out_of_memory(void)
{
caml_raise((value) &caml_bucket_Out_of_memory);
}
void caml_raise_stack_overflow(void)
{
caml_raise((value) &caml_bucket_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);
}
/* We allocate statically the bucket for the 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]. */
#define BOUND_MSG "index out of bounds"
#define BOUND_MSG_LEN (sizeof(BOUND_MSG) - 1)
static struct {
header_t hdr;
value exn;
value arg;
} array_bound_error_bucket;
static struct {
header_t hdr;
char data[BOUND_MSG_LEN + sizeof(value)];
} array_bound_error_msg = { 0, BOUND_MSG };
static int array_bound_error_bucket_inited = 0;
void caml_array_bound_error(void)
{
if (! array_bound_error_bucket_inited) {
mlsize_t wosize = (BOUND_MSG_LEN + sizeof(value)) / sizeof(value);
mlsize_t offset_index = Bsize_wsize(wosize) - 1;
array_bound_error_msg.hdr = Make_header(wosize, String_tag, Caml_white);
array_bound_error_msg.data[offset_index] = offset_index - BOUND_MSG_LEN;
array_bound_error_bucket.hdr = Make_header(2, 0, Caml_white);
array_bound_error_bucket.exn = (value) caml_exn_Invalid_argument;
array_bound_error_bucket.arg = (value) array_bound_error_msg.data;
array_bound_error_bucket_inited = 1;
caml_page_table_add(In_static_data,
&array_bound_error_msg,
&array_bound_error_msg + 1);
array_bound_error_bucket_inited = 1;
}
caml_raise((value) &array_bound_error_bucket.exn);
}
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