circuitpython/unix/ffi.c

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#include <assert.h>
#include <string.h>
#include <errno.h>
#include <dlfcn.h>
#include <ffi.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "map.h"
#include "runtime.h"
#include "binary.h"
typedef struct _mp_obj_opaque_t {
mp_obj_base_t base;
void *val;
} mp_obj_opaque_t;
typedef struct _mp_obj_ffimod_t {
mp_obj_base_t base;
void *handle;
} mp_obj_ffimod_t;
typedef struct _mp_obj_ffivar_t {
mp_obj_base_t base;
void *var;
char type;
// ffi_type *type;
} mp_obj_ffivar_t;
typedef struct _mp_obj_ffifunc_t {
mp_obj_base_t base;
void *func;
char rettype;
ffi_cif cif;
ffi_type *params[];
} mp_obj_ffifunc_t;
typedef struct _mp_obj_fficallback_t {
mp_obj_base_t base;
void *func;
ffi_closure *clo;
char rettype;
ffi_cif cif;
ffi_type *params[];
} mp_obj_fficallback_t;
//STATIC const mp_obj_type_t opaque_type;
STATIC const mp_obj_type_t ffimod_type;
STATIC const mp_obj_type_t ffifunc_type;
STATIC const mp_obj_type_t fficallback_type;
STATIC const mp_obj_type_t ffivar_type;
STATIC ffi_type *char2ffi_type(char c)
{
switch (c) {
case 'b': return &ffi_type_schar;
case 'B': return &ffi_type_uchar;
case 'i': return &ffi_type_sint;
case 'I': return &ffi_type_uint;
case 'l': return &ffi_type_slong;
case 'L': return &ffi_type_ulong;
case 'p':
case 's': return &ffi_type_pointer;
case 'v': return &ffi_type_void;
default: return NULL;
}
}
STATIC ffi_type *get_ffi_type(mp_obj_t o_in)
{
if (MP_OBJ_IS_STR(o_in)) {
uint len;
const char *s = mp_obj_str_get_data(o_in, &len);
ffi_type *t = char2ffi_type(*s);
if (t != NULL) {
return t;
}
}
// TODO: Support actual libffi type objects
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_OSError, "Unknown type"));
}
STATIC mp_obj_t return_ffi_value(ffi_arg val, char type)
{
switch (type) {
case 's': {
const char *s = (const char *)val;
return mp_obj_new_str((const byte *)s, strlen(s), false);
}
case 'v':
return mp_const_none;
default:
return mp_obj_new_int(val);
}
}
// FFI module
STATIC void ffimod_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
mp_obj_ffimod_t *self = self_in;
print(env, "<ffimod %p>", self->handle);
}
STATIC mp_obj_t ffimod_close(mp_obj_t self_in) {
mp_obj_ffimod_t *self = self_in;
dlclose(self->handle);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(ffimod_close_obj, ffimod_close);
STATIC mp_obj_t ffimod_func(uint n_args, const mp_obj_t *args) {
mp_obj_ffimod_t *self = args[0];
const char *rettype = mp_obj_str_get_str(args[1]);
const char *symname = mp_obj_str_get_str(args[2]);
void *sym = dlsym(self->handle, symname);
if (sym == NULL) {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_OSError, "[Errno %d]", errno));
}
int nparams = MP_OBJ_SMALL_INT_VALUE(mp_obj_len_maybe(args[3]));
mp_obj_ffifunc_t *o = m_new_obj_var(mp_obj_ffifunc_t, ffi_type*, nparams);
o->base.type = &ffifunc_type;
o->func = sym;
o->rettype = *rettype;
mp_obj_t iterable = rt_getiter(args[3]);
mp_obj_t item;
int i = 0;
while ((item = rt_iternext(iterable)) != MP_OBJ_NULL) {
o->params[i++] = get_ffi_type(item);
}
int res = ffi_prep_cif(&o->cif, FFI_DEFAULT_ABI, nparams, char2ffi_type(*rettype), o->params);
if (res != FFI_OK) {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_OSError, "Error in ffi_prep_cif"));
}
return o;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(ffimod_func_obj, 4, 4, ffimod_func);
STATIC void call_py_func(ffi_cif *cif, void *ret, void** args, mp_obj_t func) {
mp_obj_t pyargs[cif->nargs];
for (int i = 0; i < cif->nargs; i++) {
pyargs[i] = mp_obj_new_int(*(int*)args[i]);
}
mp_obj_t res = rt_call_function_n_kw(func, cif->nargs, 0, pyargs);
*(ffi_arg*)ret = mp_obj_int_get(res);
}
STATIC mp_obj_t mod_ffi_callback(mp_obj_t rettype_in, mp_obj_t func_in, mp_obj_t paramtypes_in) {
const char *rettype = mp_obj_str_get_str(rettype_in);
int nparams = MP_OBJ_SMALL_INT_VALUE(mp_obj_len_maybe(paramtypes_in));
mp_obj_fficallback_t *o = m_new_obj_var(mp_obj_fficallback_t, ffi_type*, nparams);
o->base.type = &fficallback_type;
o->clo = ffi_closure_alloc(sizeof(ffi_closure), &o->func);
o->rettype = *rettype;
mp_obj_t iterable = rt_getiter(paramtypes_in);
mp_obj_t item;
int i = 0;
while ((item = rt_iternext(iterable)) != MP_OBJ_NULL) {
o->params[i++] = get_ffi_type(item);
}
int res = ffi_prep_cif(&o->cif, FFI_DEFAULT_ABI, nparams, char2ffi_type(*rettype), o->params);
if (res != FFI_OK) {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_OSError, "Error in ffi_prep_cif"));
}
res = ffi_prep_closure_loc(o->clo, &o->cif, call_py_func, func_in, o->func);
if (res != FFI_OK) {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_OSError, "ffi_prep_closure_loc"));
}
return o;
}
MP_DEFINE_CONST_FUN_OBJ_3(mod_ffi_callback_obj, mod_ffi_callback);
STATIC mp_obj_t ffimod_var(mp_obj_t self_in, mp_obj_t vartype_in, mp_obj_t symname_in) {
mp_obj_ffimod_t *self = self_in;
const char *rettype = mp_obj_str_get_str(vartype_in);
const char *symname = mp_obj_str_get_str(symname_in);
void *sym = dlsym(self->handle, symname);
if (sym == NULL) {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_OSError, "[Errno %d]", errno));
}
mp_obj_ffivar_t *o = m_new_obj(mp_obj_ffivar_t);
o->base.type = &ffivar_type;
o->var = sym;
o->type = *rettype;
return o;
}
MP_DEFINE_CONST_FUN_OBJ_3(ffimod_var_obj, ffimod_var);
STATIC mp_obj_t ffimod_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
const char *fname = mp_obj_str_get_str(args[0]);
void *mod = dlopen(fname, RTLD_NOW | RTLD_LOCAL);
if (mod == NULL) {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_OSError, "[Errno %d]", errno));
}
mp_obj_ffimod_t *o = m_new_obj(mp_obj_ffimod_t);
o->base.type = type_in;
o->handle = mod;
return o;
}
STATIC const mp_map_elem_t ffimod_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_func), (mp_obj_t) &ffimod_func_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_var), (mp_obj_t) &ffimod_var_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t) &ffimod_close_obj },
};
STATIC MP_DEFINE_CONST_DICT(ffimod_locals_dict, ffimod_locals_dict_table);
STATIC const mp_obj_type_t ffimod_type = {
{ &mp_type_type },
.name = MP_QSTR_ffimod,
.print = ffimod_print,
.make_new = ffimod_make_new,
.locals_dict = (mp_obj_t)&ffimod_locals_dict,
};
// FFI function
STATIC void ffifunc_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
mp_obj_ffifunc_t *self = self_in;
print(env, "<ffifunc %p>", self->func);
}
mp_obj_t ffifunc_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_obj_ffifunc_t *self = self_in;
assert(n_kw == 0);
assert(n_args == self->cif.nargs);
ffi_arg values[n_args];
void *valueptrs[n_args];
int i;
for (i = 0; i < n_args; i++) {
mp_obj_t a = args[i];
if (a == mp_const_none) {
values[i] = 0;
} else if (MP_OBJ_IS_INT(a)) {
values[i] = mp_obj_int_get(a);
} else if (MP_OBJ_IS_STR(a) || MP_OBJ_IS_TYPE(a, &mp_type_bytes)) {
const char *s = mp_obj_str_get_str(a);
values[i] = (ffi_arg)s;
} else if (MP_OBJ_IS_TYPE(a, &fficallback_type)) {
mp_obj_fficallback_t *p = a;
values[i] = (ffi_arg)p->func;
} else {
assert(0);
}
valueptrs[i] = &values[i];
}
ffi_arg retval;
ffi_call(&self->cif, self->func, &retval, valueptrs);
return return_ffi_value(retval, self->rettype);
}
STATIC const mp_obj_type_t ffifunc_type = {
{ &mp_type_type },
.name = MP_QSTR_ffifunc,
.print = ffifunc_print,
.call = ffifunc_call,
};
// FFI callback for Python function
STATIC void fficallback_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
mp_obj_fficallback_t *self = self_in;
print(env, "<fficallback %p>", self->func);
}
STATIC const mp_obj_type_t fficallback_type = {
{ &mp_type_type },
.name = MP_QSTR_fficallback,
.print = fficallback_print,
};
// FFI variable
STATIC void ffivar_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
mp_obj_ffivar_t *self = self_in;
print(env, "<ffivar @%p: 0x%x>", self->var, *(int*)self->var);
}
STATIC mp_obj_t ffivar_get(mp_obj_t self_in) {
mp_obj_ffivar_t *self = self_in;
return mp_binary_get_val(self->type, self->var, 0);
}
MP_DEFINE_CONST_FUN_OBJ_1(ffivar_get_obj, ffivar_get);
STATIC mp_obj_t ffivar_set(mp_obj_t self_in, mp_obj_t val_in) {
mp_obj_ffivar_t *self = self_in;
mp_binary_set_val(self->type, self->var, 0, val_in);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_2(ffivar_set_obj, ffivar_set);
STATIC const mp_map_elem_t ffivar_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_get), (mp_obj_t)&ffivar_get_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_set), (mp_obj_t)&ffivar_set_obj },
};
STATIC MP_DEFINE_CONST_DICT(ffivar_locals_dict, ffivar_locals_dict_table);
STATIC const mp_obj_type_t ffivar_type = {
{ &mp_type_type },
.name = MP_QSTR_ffivar,
.print = ffivar_print,
.locals_dict = (mp_obj_t)&ffivar_locals_dict,
};
// Generic opaque storage object (unused)
/*
STATIC const mp_obj_type_t opaque_type = {
{ &mp_type_type },
.name = MP_QSTR_opaqueval,
// .print = opaque_print,
};
*/
mp_obj_t mod_ffi_open(uint n_args, const mp_obj_t *args) {
return ffimod_make_new((mp_obj_t)&ffimod_type, n_args, 0, args);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_ffi_open_obj, 1, 2, mod_ffi_open);
mp_obj_t mod_ffi_as_bytearray(mp_obj_t ptr, mp_obj_t size) {
return mp_obj_new_bytearray_by_ref(mp_obj_int_get(size), (void*)mp_obj_int_get(ptr));
}
MP_DEFINE_CONST_FUN_OBJ_2(mod_ffi_as_bytearray_obj, mod_ffi_as_bytearray);
void ffi_init() {
mp_obj_t m = mp_obj_new_module(QSTR_FROM_STR_STATIC("ffi"));
rt_store_attr(m, MP_QSTR_open, (mp_obj_t)&mod_ffi_open_obj);
rt_store_attr(m, QSTR_FROM_STR_STATIC("callback"), (mp_obj_t)&mod_ffi_callback_obj);
// there would be as_bytes, but bytes currently is value, not reference type!
rt_store_attr(m, QSTR_FROM_STR_STATIC("as_bytearray"), (mp_obj_t)&mod_ffi_as_bytearray_obj);
}