micropython/unix/ffi.c
Damien George df6567e634 Merge map.h into obj.h.
Pretty much everyone needs to include map.h, since it's such an integral
part of the Micro Python object implementation.  Thus, the definitions
are now in obj.h instead.  map.h is removed.
2014-03-30 13:54:02 +01:00

355 lines
11 KiB
C

#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 "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 = mp_getiter(args[3]);
mp_obj_t item;
int i = 0;
while ((item = mp_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 = mp_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 = mp_getiter(paramtypes_in);
mp_obj_t item;
int i = 0;
while ((item = mp_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"));
mp_store_attr(m, MP_QSTR_open, (mp_obj_t)&mod_ffi_open_obj);
mp_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!
mp_store_attr(m, QSTR_FROM_STR_STATIC("as_bytearray"), (mp_obj_t)&mod_ffi_as_bytearray_obj);
}