ktap_cdata_t *kp_cdata_new_by_id(ktap_state_t *ks, void *val, csymbol_id id)
{
csymbol *cs = id_to_csym(ks, id);
switch (csym_type(cs)) {
case FFI_VOID:
kp_error(ks, "Error: Cannot new a void type\n");
return NULL;
case FFI_UINT8:
case FFI_INT8:
case FFI_UINT16:
case FFI_INT16:
case FFI_UINT32:
case FFI_INT32:
case FFI_UINT64:
case FFI_INT64:
return kp_cdata_new_number(ks, val, id);
case FFI_PTR:
return kp_cdata_new_ptr(ks, val, 0, id, 0);
case FFI_STRUCT:
case FFI_UNION:
return kp_cdata_new_record(ks, val, id);
case FFI_FUNC:
kp_error(ks, "Error: Cannot new a function type\n");
return NULL;
case FFI_UNKNOWN:
default:
kp_error(ks, "Error: unknown csymbol type %s\n", csym_name(cs));
return NULL;
}
}
static int kplib_ffi_cast(ktap_state *ks)
{
int n = kp_arg_nr(ks);
unsigned long addr;
csymbol_id cs_id;
ktap_cdata *cd;
if (unlikely(n != 2)) {
/* this is not likely to happen since ffi.cast arguments are
* generated by compiler */
set_nil(ks->top++);
kp_error(ks, "wrong number of arguments\n");
return 1;
}
kp_arg_check(ks, 1, KTAP_TYPE_NUMBER);
kp_arg_check(ks, 2, KTAP_TYPE_NUMBER);
cs_id = nvalue(kp_arg(ks, 1));
addr = nvalue(kp_arg(ks, 2));
if (unlikely(cs_id > max_csym_id(ks)))
kp_error(ks, "invalid csymbol id\n");
cd = kp_cdata_new_record(ks, (void *)addr, cs_id);
set_cdata(ks->top, cd);
incr_top(ks);
return 1;
}
/* Init its cdata type, but not its actual value */
static void kp_cdata_init(ktap_state_t *ks, ktap_val_t *val, void *addr, int len,
csymbol_id id)
{
ffi_type type = csym_type(id_to_csym(ks, id));
switch (type) {
case FFI_PTR:
set_cdata(val, kp_cdata_new_ptr(ks, addr, len, id, 0));
break;
case FFI_STRUCT:
case FFI_UNION:
set_cdata(val, kp_cdata_new_record(ks, addr, id));
break;
case FFI_UINT8:
case FFI_INT8:
case FFI_UINT16:
case FFI_INT16:
case FFI_UINT32:
case FFI_INT32:
case FFI_UINT64:
case FFI_INT64:
/* set all these value into ktap_number(long) */
set_number(val, 0);
break;
default:
set_cdata(val, kp_cdata_new(ks, id));
break;
}
}
static int ffi_set_return(ktap_state_t *ks, void *rvalue, csymbol_id ret_id)
{
ktap_cdata_t *cd;
ffi_type type = csym_type(id_to_csym(ks, ret_id));
/* push return value to ktap stack */
switch (type) {
case FFI_VOID:
return 0;
case FFI_UINT8:
case FFI_INT8:
case FFI_UINT16:
case FFI_INT16:
case FFI_UINT32:
case FFI_INT32:
case FFI_UINT64:
case FFI_INT64:
set_number(ks->top, (ktap_number)rvalue);
break;
case FFI_PTR:
cd = kp_cdata_new_ptr(ks, rvalue, -1, ret_id, 0);
set_cdata(ks->top, cd);
break;
case FFI_STRUCT:
case FFI_UNION:
cd = kp_cdata_new_record(ks, rvalue, ret_id);
set_cdata(ks->top, cd);
break;
case FFI_FUNC:
case FFI_UNKNOWN:
kp_error(ks, "Error: Have not support ffi_type %s\n",
ffi_type_name(type));
return 0;
}
incr_top(ks);
return 1;
}
