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, 8 insertions, 8 deletions

diff --git a/py/objclosure.c b/py/objclosure.c
index 95c1adde0..a4000e5dd 100644
--- a/py/objclosure.c
+++ b/py/objclosure.c
@@ -60,21 +60,21 @@ STATIC mp_obj_t closure_call(mp_obj_t self_in, mp_uint_t n_args, mp_uint_t n_kw,
 }
 
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
-STATIC void closure_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
+STATIC void closure_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
     (void)kind;
     mp_obj_closure_t *o = o_in;
-    print(env, "<closure ");
-    mp_obj_print_helper(print, env, o->fun, PRINT_REPR);
-    print(env, " at %p, n_closed=%u ", o, o->n_closed);
+    mp_print_str(print, "<closure ");
+    mp_obj_print_helper(print, o->fun, PRINT_REPR);
+    mp_printf(print, " at %p, n_closed=%u ", o, o->n_closed);
     for (mp_uint_t i = 0; i < o->n_closed; i++) {
         if (o->closed[i] == MP_OBJ_NULL) {
-            print(env, "(nil)");
+            mp_print_str(print, "(nil)");
         } else {
-            mp_obj_print_helper(print, env, o->closed[i], PRINT_REPR);
+            mp_obj_print_helper(print, o->closed[i], PRINT_REPR);
         }
-        print(env, " ");
+        mp_print_str(print, " ");
     }
-    print(env, ">");
+    mp_print_str(print, ">");
 }
 #endif