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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
/* Callbacks from C to OCaml */
#include <string.h>
#include "caml/callback.h"
#include "caml/fail.h"
#include "caml/memory.h"
#include "caml/mlvalues.h"
#ifndef NATIVE_CODE
/* Bytecode callbacks */
#include "caml/interp.h"
#include "caml/instruct.h"
#include "caml/fix_code.h"
#include "caml/stacks.h"
CAMLexport int caml_callback_depth = 0;
#ifndef LOCAL_CALLBACK_BYTECODE
static opcode_t callback_code[] = { ACC, 0, APPLY, 0, POP, 1, STOP };
#endif
#ifdef THREADED_CODE
static int callback_code_threaded = 0;
static void thread_callback(void)
{
caml_thread_code(callback_code, sizeof(callback_code));
callback_code_threaded = 1;
}
#define Init_callback() if (!callback_code_threaded) thread_callback()
#else
#define Init_callback()
#endif
CAMLexport value caml_callbackN_exn(value closure, int narg, value args[])
{
int i;
value res;
/* some alternate bytecode implementations (e.g. a JIT translator)
might require that the bytecode is kept in a local variable on
the C stack */
#ifdef LOCAL_CALLBACK_BYTECODE
opcode_t local_callback_code[7];
#endif
CAMLassert(narg + 4 <= 256);
caml_extern_sp -= narg + 4;
for (i = 0; i < narg; i++) caml_extern_sp[i] = args[i]; /* arguments */
#ifndef LOCAL_CALLBACK_BYTECODE
caml_extern_sp[narg] = (value) (callback_code + 4); /* return address */
caml_extern_sp[narg + 1] = Val_unit; /* environment */
caml_extern_sp[narg + 2] = Val_long(0); /* extra args */
caml_extern_sp[narg + 3] = closure;
Init_callback();
callback_code[1] = narg + 3;
callback_code[3] = narg;
res = caml_interprete(callback_code, sizeof(callback_code));
#else /*have LOCAL_CALLBACK_BYTECODE*/
caml_extern_sp[narg] = (value) (local_callback_code + 4); /* return address */
caml_extern_sp[narg + 1] = Val_unit; /* environment */
caml_extern_sp[narg + 2] = Val_long(0); /* extra args */
caml_extern_sp[narg + 3] = closure;
local_callback_code[0] = ACC;
local_callback_code[1] = narg + 3;
local_callback_code[2] = APPLY;
local_callback_code[3] = narg;
local_callback_code[4] = POP;
local_callback_code[5] = 1;
local_callback_code[6] = STOP;
#ifdef THREADED_CODE
caml_thread_code(local_callback_code, sizeof(local_callback_code));
#endif /*THREADED_CODE*/
res = caml_interprete(local_callback_code, sizeof(local_callback_code));
caml_release_bytecode(local_callback_code, sizeof(local_callback_code));
#endif /*LOCAL_CALLBACK_BYTECODE*/
if (Is_exception_result(res)) caml_extern_sp += narg + 4; /* PR#1228 */
return res;
}
CAMLexport value caml_callback_exn(value closure, value arg1)
{
value arg[1];
arg[0] = arg1;
return caml_callbackN_exn(closure, 1, arg);
}
CAMLexport value caml_callback2_exn(value closure, value arg1, value arg2)
{
value arg[2];
arg[0] = arg1;
arg[1] = arg2;
return caml_callbackN_exn(closure, 2, arg);
}
CAMLexport value caml_callback3_exn(value closure,
value arg1, value arg2, value arg3)
{
value arg[3];
arg[0] = arg1;
arg[1] = arg2;
arg[2] = arg3;
return caml_callbackN_exn(closure, 3, arg);
}
#else
/* Native-code callbacks. caml_callback[123]_exn are implemented in asm. */
CAMLexport value caml_callbackN_exn(value closure, int narg, value args[])
{
CAMLparam1 (closure);
CAMLxparamN (args, narg);
CAMLlocal1 (res);
int i;
res = closure;
for (i = 0; i < narg; /*nothing*/) {
/* Pass as many arguments as possible */
switch (narg - i) {
case 1:
res = caml_callback_exn(res, args[i]);
if (Is_exception_result(res)) CAMLreturn (res);
i += 1;
break;
case 2:
res = caml_callback2_exn(res, args[i], args[i + 1]);
if (Is_exception_result(res)) CAMLreturn (res);
i += 2;
break;
default:
res = caml_callback3_exn(res, args[i], args[i + 1], args[i + 2]);
if (Is_exception_result(res)) CAMLreturn (res);
i += 3;
break;
}
}
CAMLreturn (res);
}
#endif
/* Exception-propagating variants of the above */
CAMLexport value caml_callback (value closure, value arg)
{
value res = caml_callback_exn(closure, arg);
if (Is_exception_result(res)) caml_raise(Extract_exception(res));
return res;
}
CAMLexport value caml_callback2 (value closure, value arg1, value arg2)
{
value res = caml_callback2_exn(closure, arg1, arg2);
if (Is_exception_result(res)) caml_raise(Extract_exception(res));
return res;
}
CAMLexport value caml_callback3 (value closure, value arg1, value arg2,
value arg3)
{
value res = caml_callback3_exn(closure, arg1, arg2, arg3);
if (Is_exception_result(res)) caml_raise(Extract_exception(res));
return res;
}
CAMLexport value caml_callbackN (value closure, int narg, value args[])
{
value res = caml_callbackN_exn(closure, narg, args);
if (Is_exception_result(res)) caml_raise(Extract_exception(res));
return res;
}
/* Naming of OCaml values */
struct named_value {
value val;
struct named_value * next;
char name[1];
};
#define Named_value_size 13
static struct named_value * named_value_table[Named_value_size] = { NULL, };
static unsigned int hash_value_name(char const *name)
{
unsigned int h;
for (h = 0; *name != 0; name++) h = h * 19 + *name;
return h % Named_value_size;
}
CAMLprim value caml_register_named_value(value vname, value val)
{
struct named_value * nv;
const char * name = String_val(vname);
size_t namelen = strlen(name);
unsigned int h = hash_value_name(name);
for (nv = named_value_table[h]; nv != NULL; nv = nv->next) {
if (strcmp(name, nv->name) == 0) {
nv->val = val;
return Val_unit;
}
}
nv = (struct named_value *)
caml_stat_alloc(sizeof(struct named_value) + namelen);
memcpy(nv->name, name, namelen + 1);
nv->val = val;
nv->next = named_value_table[h];
named_value_table[h] = nv;
caml_register_global_root(&nv->val);
return Val_unit;
}
CAMLexport value * caml_named_value(char const *name)
{
struct named_value * nv;
for (nv = named_value_table[hash_value_name(name)];
nv != NULL;
nv = nv->next) {
if (strcmp(name, nv->name) == 0) return &nv->val;
}
return NULL;
}
CAMLexport void caml_iterate_named_values(caml_named_action f)
{
int i;
for(i = 0; i < Named_value_size; i++){
struct named_value * nv;
for (nv = named_value_table[i]; nv != NULL; nv = nv->next) {
f( &nv->val, nv->name );
}
}
}
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