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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. */
/* */
/***********************************************************************/
/* $Id$ */
/* Raising exceptions from C. */
#include "alloc.h"
#include "fail.h"
#include "io.h"
#include "gc.h"
#include "memory.h"
#include "misc.h"
#include "mlvalues.h"
#include "signals.h"
#include "stacks.h"
struct longjmp_buffer * external_raise = NULL;
value exn_bucket;
void mlraise(value v)
{
#ifdef DEBUG
extern int volatile async_signal_mode; /* from signals.c */
Assert(! async_signal_mode);
#endif
Unlock_exn();
exn_bucket = v;
if (external_raise == NULL) fatal_uncaught_exception(v);
siglongjmp(external_raise->buf, 1);
}
void raise_constant(value tag)
{
CAMLparam1 (tag);
CAMLlocal1 (bucket);
bucket = alloc_small (1, 0);
Field(bucket, 0) = tag;
mlraise(bucket);
}
void raise_with_arg(value tag, value arg)
{
CAMLparam2 (tag, arg);
CAMLlocal1 (bucket);
bucket = alloc_small (2, 0);
Field(bucket, 0) = tag;
Field(bucket, 1) = arg;
mlraise(bucket);
}
void raise_with_string(value tag, char *msg)
{
CAMLparam1 (tag);
CAMLlocal1 (vmsg);
vmsg = copy_string(msg);
raise_with_arg(tag, vmsg);
}
void failwith (char *msg)
{
raise_with_string(Field(global_data, FAILURE_EXN), msg);
}
void invalid_argument (char *msg)
{
raise_with_string(Field(global_data, INVALID_EXN), msg);
}
/* Problem: we can't use raise_constant, because it allocates and
we're out of memory... Here, we allocate statically the exn bucket
for Out_of_memory. */
static struct {
header_t hdr;
value exn;
} out_of_memory_bucket = { 0, 0 };
void raise_out_of_memory(void)
{
if (out_of_memory_bucket.exn == 0)
fatal_error("Fatal error: out of memory while raising Out_of_memory\n");
mlraise((value) &(out_of_memory_bucket.exn));
}
void raise_stack_overflow(void)
{
raise_constant(Field(global_data, STACK_OVERFLOW_EXN));
}
void raise_sys_error(value msg)
{
raise_with_arg(Field(global_data, SYS_ERROR_EXN), msg);
}
void raise_end_of_file(void)
{
raise_constant(Field(global_data, END_OF_FILE_EXN));
}
void raise_zero_divide(void)
{
raise_constant(Field(global_data, ZERO_DIVIDE_EXN));
}
void raise_not_found(void)
{
raise_constant(Field(global_data, NOT_FOUND_EXN));
}
void raise_sys_blocked_io(void)
{
raise_constant(Field(global_data, SYS_BLOCKED_IO));
}
/* Initialization of statically-allocated exception buckets */
void init_exceptions(void)
{
out_of_memory_bucket.hdr = Make_header(1, 0, Caml_white);
out_of_memory_bucket.exn = Field(global_data, OUT_OF_MEMORY_EXN);
register_global_root(&out_of_memory_bucket.exn);
}
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