py: Overhaul and simplify printf/pfenv mechanism.

Previous to this patch the printing mechanism was a bit of a tangled
mess.  This patch attempts to consolidate printing into one interface.

All (non-debug) printing now uses the mp_print* family of functions,
mainly mp_printf.  All these functions take an mp_print_t structure as
their first argument, and this structure defines the printing backend
through the "print_strn" function of said structure.

Printing from the uPy core can reach the platform-defined print code via
two paths: either through mp_sys_stdout_obj (defined pert port) in
conjunction with mp_stream_write; or through the mp_plat_print structure
which uses the MP_PLAT_PRINT_STRN macro to define how string are printed
on the platform.  The former is only used when MICROPY_PY_IO is defined.

With this new scheme printing is generally more efficient (less layers
to go through, less arguments to pass), and, given an mp_print_t*
structure, one can call mp_print_str for efficiency instead of
mp_printf("%s", ...).  Code size is also reduced by around 200 bytes on
Thumb2 archs.

1 files changed, 5 insertions, 5 deletions

diff --git a/py/objlist.c b/py/objlist.c
index e1343d9b32..9404032128 100644
--- a/py/objlist.c
+++ b/py/objlist.c
@@ -44,19 +44,19 @@ STATIC mp_obj_t list_pop(mp_uint_t n_args, const mp_obj_t *args);
 /******************************************************************************/
 /* list                                                                       */
 
-STATIC void list_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
+STATIC void list_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
     mp_obj_list_t *o = MP_OBJ_CAST(o_in);
     if (!(MICROPY_PY_UJSON && kind == PRINT_JSON)) {
         kind = PRINT_REPR;
     }
-    print(env, "[");
+    mp_print_str(print, "[");
     for (mp_uint_t i = 0; i < o->len; i++) {
         if (i > 0) {
-            print(env, ", ");
+            mp_print_str(print, ", ");
         }
-        mp_obj_print_helper(print, env, o->items[i], kind);
+        mp_obj_print_helper(print, o->items[i], kind);
     }
-    print(env, "]");
+    mp_print_str(print, "]");
 }
 
 STATIC mp_obj_t list_extend_from_iter(mp_obj_t list, mp_obj_t iterable) {