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/* -*- C -*-
* $Id$
*/
#include <ruby.h>
#include <errno.h>
#include "dl.h"
#include <dl_conversions.h>
VALUE rb_cDLFunction;
typedef union
{
unsigned char uchar; /* ffi_type_uchar */
signed char schar; /* ffi_type_schar */
unsigned short ushort; /* ffi_type_sshort */
signed short sshort; /* ffi_type_ushort */
unsigned int uint; /* ffi_type_uint */
signed int sint; /* ffi_type_sint */
unsigned long ulong; /* ffi_type_ulong */
signed long slong; /* ffi_type_slong */
float ffloat; /* ffi_type_float */
double ddouble; /* ffi_type_double */
#if HAVE_LONG_LONG
unsigned LONG_LONG long_long; /* ffi_type_uint64 */
#endif
void * pointer; /* ffi_type_pointer */
} dl_generic;
static void
dlfunction_free(void *p)
{
ffi_cif *ptr = p;
if (ptr->arg_types) xfree(ptr->arg_types);
xfree(ptr);
}
static size_t
dlfunction_memsize(const void *p)
{
/* const */ffi_cif *ptr = (ffi_cif *)p;
size_t size = 0;
if (ptr) {
size += sizeof(*ptr);
size += ffi_raw_size(ptr);
}
return size;
}
const rb_data_type_t dlfunction_data_type = {
"dl/function",
0, dlfunction_free, dlfunction_memsize,
};
static VALUE
rb_dlfunc_allocate(VALUE klass)
{
ffi_cif * cif;
return TypedData_Make_Struct(klass, ffi_cif, &dlfunction_data_type, cif);
}
static VALUE
rb_dlfunction_native_init(VALUE self, VALUE args, VALUE ret_type, VALUE abi)
{
ffi_cif * cif;
ffi_type **arg_types;
ffi_status result;
int i;
TypedData_Get_Struct(self, ffi_cif, &dlfunction_data_type, cif);
arg_types = xcalloc(RARRAY_LEN(args) + 1, sizeof(ffi_type *));
for (i = 0; i < RARRAY_LEN(args); i++) {
int type = NUM2INT(RARRAY_PTR(args)[i]);
arg_types[i] = DL2FFI_TYPE(type);
}
arg_types[RARRAY_LEN(args)] = NULL;
result = ffi_prep_cif (
cif,
NUM2INT(abi),
RARRAY_LEN(args),
DL2FFI_TYPE(NUM2INT(ret_type)),
arg_types);
if (result)
rb_raise(rb_eRuntimeError, "error creating CIF %d", result);
return self;
}
static void
dl2generic(int dl_type, VALUE src, dl_generic * dst)
{
int signed_p = 1;
if (dl_type < 0) {
dl_type = -1 * dl_type;
signed_p = 0;
}
switch (dl_type) {
case DLTYPE_VOID:
break;
case DLTYPE_VOIDP:
dst->pointer = NUM2PTR(rb_Integer(src));
break;
case DLTYPE_CHAR:
case DLTYPE_SHORT:
case DLTYPE_INT:
dst->sint = NUM2INT(src);
break;
case DLTYPE_LONG:
if (signed_p)
dst->slong = NUM2LONG(src);
else
dst->ulong = NUM2LONG(src);
break;
#if HAVE_LONG_LONG
case DLTYPE_LONG_LONG:
dst->long_long = rb_big2ull(src);
break;
#endif
case DLTYPE_FLOAT:
dst->ffloat = (float)NUM2DBL(src);
break;
case DLTYPE_DOUBLE:
dst->ddouble = NUM2DBL(src);
break;
default:
rb_raise(rb_eRuntimeError, "unknown type %d", dl_type);
}
}
static VALUE
unwrap_ffi(VALUE rettype, dl_generic retval)
{
int signed_p = 1;
int dl_type = NUM2INT(rettype);
if (dl_type < 0) {
dl_type = -1 * dl_type;
signed_p = 0;
}
switch (dl_type) {
case DLTYPE_VOID:
return Qnil;
case DLTYPE_VOIDP:
return rb_dlptr_new((void *)retval.pointer, 0, NULL);
case DLTYPE_CHAR:
case DLTYPE_SHORT:
case DLTYPE_INT:
return INT2NUM(retval.sint);
case DLTYPE_LONG:
if (signed_p) return LONG2NUM(retval.slong);
return ULONG2NUM(retval.ulong);
#if HAVE_LONG_LONG
case DLTYPE_LONG_LONG:
return rb_ll2inum(retval.long_long);
break;
#endif
case DLTYPE_FLOAT:
return rb_float_new(retval.ffloat);
case DLTYPE_DOUBLE:
return rb_float_new(retval.ddouble);
default:
rb_raise(rb_eRuntimeError, "unknown type %d", dl_type);
}
}
static VALUE
rb_dlfunction_call(int argc, VALUE argv[], VALUE self)
{
ffi_cif * cif;
dl_generic retval;
dl_generic *generic_args;
void **values;
void * fun_ptr;
VALUE cfunc, types;
int i;
TypedData_Get_Struct(self, ffi_cif, &dlfunction_data_type, cif);
values = xcalloc((size_t)argc + 1, (size_t)sizeof(void *));
generic_args = xcalloc((size_t)argc, (size_t)sizeof(dl_generic));
cfunc = rb_iv_get(self, "@cfunc");
types = rb_iv_get(self, "@args");
for (i = 0; i < argc; i++) {
VALUE dl_type = RARRAY_PTR(types)[i];
VALUE src = rb_funcall(self,
rb_intern("ruby2ffi"),
2,
argv[i],
dl_type
);
dl2generic(NUM2INT(dl_type), src, &generic_args[i]);
values[i] = (void *)&generic_args[i];
}
values[argc] = NULL;
ffi_call(cif, NUM2PTR(rb_Integer(cfunc)), &retval, values);
rb_dl_set_last_error(self, INT2NUM(errno));
#if defined(HAVE_WINDOWS_H)
rb_dl_set_win32_last_error(self, INT2NUM(GetLastError()));
#endif
xfree(values);
xfree(generic_args);
return unwrap_ffi(rb_funcall(cfunc, rb_intern("ctype"), 0), retval);
}
void
Init_dlfunction(void)
{
rb_cDLFunction = rb_define_class_under(rb_mDL, "Function", rb_cObject);
rb_define_const(rb_cDLFunction, "DEFAULT", INT2NUM(FFI_DEFAULT_ABI));
#ifdef FFI_STDCALL
rb_define_const(rb_cDLFunction, "STDCALL", INT2NUM(FFI_STDCALL));
#endif
rb_define_alloc_func(rb_cDLFunction, rb_dlfunc_allocate);
rb_define_private_method(rb_cDLFunction, "native_call", rb_dlfunction_call, -1);
rb_define_private_method(rb_cDLFunction, "native_init", rb_dlfunction_native_init, 3);
}
/* vim: set noet sw=4 sts=4 */
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