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micropython/py/objarray.c

328 wiersze
9.3 KiB
C
Czysty Wina Historia

#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "map.h"
#include "runtime0.h"
#include "runtime.h"
// Use special typecode to differentiate repr() of bytearray vs array.array('B')
// (underlyingly they're same).
#define BYTEARRAY_TYPECODE 0
typedef struct _mp_obj_array_t {
mp_obj_base_t base;
struct {
machine_uint_t typecode : 8;
// free is number of unused elements after len used elements
// alloc size = len + free
machine_uint_t free : (8 * sizeof(machine_uint_t) - 8);
};
machine_uint_t len; // in elements
void *items;
} mp_obj_array_t;
STATIC mp_obj_t array_iterator_new(mp_obj_t array_in);
STATIC mp_obj_array_t *array_new(char typecode, uint n);
STATIC mp_obj_t array_append(mp_obj_t self_in, mp_obj_t arg);
/******************************************************************************/
/* array */
STATIC machine_int_t array_get_el_size(char typecode) {
// This assumes that unsigned and signed types are of the same type,
// which is invariant for [u]intN_t.
switch (typecode) {
case BYTEARRAY_TYPECODE:
case 'b':
case 'B':
return sizeof(int8_t);
case 'h':
case 'H':
return sizeof(int16_t);
case 'i':
case 'I':
return sizeof(int32_t);
case 'l':
case 'L':
return sizeof(int32_t);
}
return -1;
}
STATIC machine_int_t array_get_el(mp_obj_array_t *o, int index) {
machine_int_t val = 0;
switch (o->typecode) {
case 'b':
val = ((int8_t*)o->items)[index];
break;
case BYTEARRAY_TYPECODE:
case 'B':
val = ((uint8_t*)o->items)[index];
break;
case 'h':
val = ((int16_t*)o->items)[index];
break;
case 'H':
val = ((uint16_t*)o->items)[index];
break;
case 'i':
val = ((int32_t*)o->items)[index];
break;
case 'I':
val = ((uint32_t*)o->items)[index];
break;
case 'l':
val = ((int32_t*)o->items)[index];
break;
case 'L':
val = ((uint32_t*)o->items)[index];
break;
}
return val;
}
STATIC void array_set_el(mp_obj_array_t *o, int index, mp_obj_t val_in) {
machine_int_t val = mp_obj_int_get(val_in);
switch (o->typecode) {
case 'b':
((int8_t*)o->items)[index] = val;
break;
case BYTEARRAY_TYPECODE:
case 'B':
((uint8_t*)o->items)[index] = val;
break;
case 'h':
((int16_t*)o->items)[index] = val;
break;
case 'H':
((uint16_t*)o->items)[index] = val;
break;
case 'i':
((int32_t*)o->items)[index] = val;
break;
case 'I':
((uint32_t*)o->items)[index] = val;
break;
case 'l':
((int32_t*)o->items)[index] = val;
break;
case 'L':
((uint32_t*)o->items)[index] = val;
break;
}
}
STATIC void array_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
mp_obj_array_t *o = o_in;
if (o->typecode == BYTEARRAY_TYPECODE) {
print(env, "bytearray(b", o->typecode);
mp_str_print_quoted(print, env, o->items, o->len);
} else {
print(env, "array('%c'", o->typecode);
if (o->len > 0) {
print(env, ", [", o->typecode);
for (int i = 0; i < o->len; i++) {
if (i > 0) {
print(env, ", ");
}
print(env, "%d", array_get_el(o, i));
}
print(env, "]");
}
}
print(env, ")");
}
STATIC mp_obj_t array_construct(char typecode, mp_obj_t initializer) {
uint len;
// Try to create array of exact len if initializer len is known
mp_obj_t len_in = mp_obj_len_maybe(initializer);
if (len_in == MP_OBJ_NULL) {
len = 0;
} else {
len = MP_OBJ_SMALL_INT_VALUE(len_in);
}
mp_obj_array_t *array = array_new(typecode, len);
mp_obj_t iterable = rt_getiter(initializer);
mp_obj_t item;
int i = 0;
while ((item = rt_iternext(iterable)) != mp_const_stop_iteration) {
if (len == 0) {
array_append(array, item);
} else {
array_set_el(array, i++, item);
}
}
return array;
}
STATIC mp_obj_t array_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
if (n_args < 1 || n_args > 2) {
nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_TypeError, "unexpected # of arguments, %d given", n_args));
}
// TODO check args
uint l;
const char *typecode = mp_obj_str_get_data(args[0], &l);
if (n_args == 1) {
return array_new(*typecode, 0);
}
return array_construct(*typecode, args[1]);
}
// This is top-level factory function, not virtual method
// TODO: "bytearray" really should be type, not function
STATIC mp_obj_t mp_builtin_bytearray(mp_obj_t arg) {
return array_construct(BYTEARRAY_TYPECODE, arg);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_bytearray_obj, mp_builtin_bytearray);
STATIC mp_obj_t array_unary_op(int op, mp_obj_t o_in) {
mp_obj_array_t *o = o_in;
switch (op) {
case RT_UNARY_OP_BOOL: return MP_BOOL(o->len != 0);
case RT_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(o->len);
default: return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_obj_t array_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
mp_obj_array_t *o = lhs;
switch (op) {
case RT_BINARY_OP_SUBSCR:
{
uint index = mp_get_index(o->base.type, o->len, rhs);
machine_int_t val = array_get_el(o, index);
return mp_obj_new_int(val);
}
default:
// op not supported
return MP_OBJ_NULL;
}
}
STATIC mp_obj_t array_append(mp_obj_t self_in, mp_obj_t arg) {
assert(MP_OBJ_IS_TYPE(self_in, &array_type));
mp_obj_array_t *self = self_in;
if (self->free == 0) {
int item_sz = array_get_el_size(self->typecode);
// TODO: alloc policy
self->free = 8;
self->items = m_realloc(self->items, item_sz * self->len, item_sz * (self->len + self->free));
}
array_set_el(self, self->len++, arg);
self->free--;
return mp_const_none; // return None, as per CPython
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(array_append_obj, array_append);
STATIC bool array_store_item(mp_obj_t self_in, mp_obj_t index_in, mp_obj_t value) {
mp_obj_array_t *o = self_in;
uint index = mp_get_index(o->base.type, o->len, index_in);
array_set_el(o, index, value);
return true;
}
STATIC machine_int_t array_get_buffer(mp_obj_t o_in, buffer_info_t *bufinfo, int flags) {
mp_obj_array_t *o = o_in;
bufinfo->buf = o->items;
bufinfo->len = o->len * array_get_el_size(o->typecode);
return 0;
}
STATIC const mp_method_t array_type_methods[] = {
{ "append", &array_append_obj },
{ NULL, NULL },
};
const mp_obj_type_t array_type = {
{ &mp_const_type },
"array",
.print = array_print,
.make_new = array_make_new,
.getiter = array_iterator_new,
.unary_op = array_unary_op,
.binary_op = array_binary_op,
.store_item = array_store_item,
.methods = array_type_methods,
.buffer_p = { .get_buffer = array_get_buffer },
};
STATIC mp_obj_array_t *array_new(char typecode, uint n) {
mp_obj_array_t *o = m_new_obj(mp_obj_array_t);
o->base.type = &array_type;
o->typecode = typecode;
o->free = 0;
o->len = n;
o->items = m_malloc(array_get_el_size(typecode) * o->len);
return o;
}
uint mp_obj_array_len(mp_obj_t self_in) {
return ((mp_obj_array_t *)self_in)->len;
}
mp_obj_t mp_obj_new_bytearray(uint n, void *items) {
mp_obj_array_t *o = array_new(BYTEARRAY_TYPECODE, n);
memcpy(o->items, items, n);
return o;
}
// Create bytearray which references specified memory area
mp_obj_t mp_obj_new_bytearray_by_ref(uint n, void *items) {
mp_obj_array_t *o = m_new_obj(mp_obj_array_t);
o->base.type = &array_type;
o->typecode = BYTEARRAY_TYPECODE;
o->free = 0;
o->len = n;
o->items = items;
return o;
}
/******************************************************************************/
/* array iterator */
typedef struct _mp_obj_array_it_t {
mp_obj_base_t base;
mp_obj_array_t *array;
machine_uint_t cur;
} mp_obj_array_it_t;
mp_obj_t array_it_iternext(mp_obj_t self_in) {
mp_obj_array_it_t *self = self_in;
if (self->cur < self->array->len) {
machine_int_t val = array_get_el(self->array, self->cur++);
return mp_obj_new_int(val);
} else {
return mp_const_stop_iteration;
}
}
STATIC const mp_obj_type_t array_it_type = {
{ &mp_const_type },
"array_iterator",
.iternext = array_it_iternext,
};
mp_obj_t array_iterator_new(mp_obj_t array_in) {
mp_obj_array_t *array = array_in;
mp_obj_array_it_t *o = m_new_obj(mp_obj_array_it_t);
o->base.type = &array_it_type;
o->array = array;
o->cur = 0;
return o;
}
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