Change object representation from 1 big union to individual structs.

A big change.  Micro Python objects are allocated as individual structs
with the first element being a pointer to the type information (which
is itself an object).  This scheme follows CPython.  Much more flexible,
not necessarily slower, uses same heap memory, and can allocate objects
statically.

Also change name prefix, from py_ to mp_ (mp for Micro Python).

1 files changed, 43 insertions, 0 deletions

diff --git a/py/objcell.c b/py/objcell.c
new file mode 100644
index 000000000..cba198057
--- /dev/null
+++ b/py/objcell.c
@@ -0,0 +1,43 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <assert.h>
+
+#include "nlr.h"
+#include "misc.h"
+#include "mpconfig.h"
+#include "obj.h"
+#include "runtime.h"
+
+typedef struct _mp_obj_cell_t {
+    mp_obj_base_t base;
+    mp_obj_t obj;
+} mp_obj_cell_t;
+
+mp_obj_t mp_obj_cell_get(mp_obj_t self_in) {
+    mp_obj_cell_t *self = self_in;
+    return self->obj;
+}
+
+void mp_obj_cell_set(mp_obj_t self_in, mp_obj_t obj) {
+    mp_obj_cell_t *self = self_in;
+    self->obj = obj;
+}
+
+const mp_obj_type_t cell_type = {
+    { &mp_const_type },
+    "cell",
+    NULL, // print
+    NULL, // call_n
+    NULL, // unary_op
+    NULL, // binary_op
+    NULL, // getiter
+    NULL, // iternext
+    {{NULL, NULL},}, // method list
+};
+
+mp_obj_t mp_obj_new_cell(mp_obj_t obj) {
+    mp_obj_cell_t *o = m_new_obj(mp_obj_cell_t);
+    o->base.type = &cell_type;
+    o->obj = obj;
+    return o;
+}