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, 1 insertions, 2 deletions

diff --git a/stmhal/pyexec.c b/stmhal/pyexec.c
index 27c206ce39..95776f3ec8 100644
--- a/stmhal/pyexec.c
+++ b/stmhal/pyexec.c
@@ -33,7 +33,6 @@
 #include "py/runtime.h"
 #include "py/repl.h"
 #include "py/gc.h"
-#include "py/pfenv.h"
 #ifdef MICROPY_HAL_H
 #include MICROPY_HAL_H
 #endif
@@ -87,7 +86,7 @@ STATIC int parse_compile_execute(mp_lexer_t *lex, mp_parse_input_kind_t input_ki
             // at the moment, the value of SystemExit is unused
             ret = PYEXEC_FORCED_EXIT;
         } else {
-            mp_obj_print_exception(printf_wrapper, NULL, (mp_obj_t)nlr.ret_val);
+            mp_obj_print_exception(&mp_plat_print, (mp_obj_t)nlr.ret_val);
             ret = 0;
         }
     }