Add skeleton implementation of array.array and bytearray.
So far, only storage, initialization, repr() and buffer protocol is
implemented - alredy suitable for passing binary data around.
diff --git a/py/objarray.c b/py/objarray.c
new file mode 100644
index 0000000..a321e2a
--- /dev/null
+++ b/py/objarray.c
@@ -0,0 +1,262 @@
+#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 "mpqstr.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_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([", o->typecode);
+ } else {
+ print(env, "array('%c', [", 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, "])");
+}
+
+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) {
+ switch (n_args) {
+ case 2:
+ {
+ const char *code = qstr_str(mp_obj_str_get(args[0]));
+ mp_obj_t initializer = args[1];
+ return array_construct(*code, initializer);
+ }
+
+ default:
+ nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_TypeError, "unexpected # of arguments, %d given", n_args));
+ }
+ return NULL;
+}
+
+// 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_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,
+ .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;
+}
+
+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;
+}