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py/builtinimport: Allow overriding of mp_builtin___import__. 

This allows ports to override mp_builtin___import__.

This can be useful in MicroPython applications where
MICROPY_ENABLE_EXTERNAL_IMPORT has to be disabled due to its impact on
build size (2% to 2.5% of the minimal port). By overriding the otherwise
very minimal mp_builtin___import__, ports can still allow limited forms
of application-specific imports.

Signed-off-by: Laurens Valk <laurens@pybricks.com>
This commit is contained in:
Laurens Valk 2022-08-19 16:40:28 +02:00 committed by Damien George
parent 3d65101a8a
commit d8ad87843a
2 changed files with 8 additions and 2 deletions
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6
py/builtin.h
View File

@ -64,7 +64,13 @@ MP_DECLARE_CONST_FUN_OBJ_KW(mp_builtin_open_obj);
#endif
// A port can provide its own import handler by defining mp_builtin___import__.
#ifndef mp_builtin___import__
#define mp_builtin___import__ mp_builtin___import___default
#endif
mp_obj_t mp_builtin___import__(size_t n_args, const mp_obj_t *args);
mp_obj_t mp_builtin___import___default(size_t n_args, const mp_obj_t *args);
mp_obj_t mp_micropython_mem_info(size_t n_args, const mp_obj_t *args);
MP_DECLARE_CONST_FUN_OBJ_VAR(mp_builtin___build_class___obj);

4
py/builtinimport.c
View File

@ -467,7 +467,7 @@ STATIC mp_obj_t process_import_at_level(qstr full_mod_name, qstr level_mod_name,
return module_obj;
}
mp_obj_t mp_builtin___import__(size_t n_args, const mp_obj_t *args) {
mp_obj_t mp_builtin___import___default(size_t n_args, const mp_obj_t *args) {
#if DEBUG_PRINT
DEBUG_printf("__import__:\n");
for (size_t i = 0; i < n_args; i++) {
@ -566,7 +566,7 @@ mp_obj_t mp_builtin___import__(size_t n_args, const mp_obj_t *args) {
#else // MICROPY_ENABLE_EXTERNAL_IMPORT
mp_obj_t mp_builtin___import__(size_t n_args, const mp_obj_t *args) {
mp_obj_t mp_builtin___import___default(size_t n_args, const mp_obj_t *args) {
// Check that it's not a relative import
if (n_args >= 5 && MP_OBJ_SMALL_INT_VALUE(args[4]) != 0) {
mp_raise_NotImplementedError(MP_ERROR_TEXT("relative import"));