py/builtinimport: Refactor module importing.

Simplify and document/comment the handling of builtin import for: - already-loaded modules - built-in modules - built-in umodules (formerly weak links) - filesystem modules Retains existing functionality with smaller code size but should also facilitate potential new features (built-in packages, controlling the frozen path). Also makes the (unix-only) -m behavior a bit more obvious and configurable. Code size change with this commit: bare-arm: +0 +0.000% minimal x86: -64 -0.039% unix x64: -32 -0.006% unix nanbox: -4 -0.001% stm32: -184 -0.047% PYBV10 cc3200: -120 -0.065% esp8266: -228 -0.033% GENERIC esp32: -268 -0.018% GENERIC[incl +16(data)] nrf: -152 -0.087% pca10040 rp2: -256 -0.052% PICO samd: -80 -0.057% ADAFRUIT_ITSYBITSY_M4_EXPRESS
bcr · Dec 1, 2021 · a7fa18c · a7fa18c
1 parent 851ecb2
commit a7fa18c
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Showing 6 changed files with 341 additions and 250 deletions.
diff --git a/ports/unix/mpconfigport.h b/ports/unix/mpconfigport.h
@@ -86,6 +86,7 @@
 #define MICROPY_OPT_MAP_LOOKUP_CACHE (1)
 #endif
 #define MICROPY_MODULE_WEAK_LINKS   (1)
+#define MICROPY_MODULE_OVERRIDE_MAIN_IMPORT (1)
 #define MICROPY_CAN_OVERRIDE_BUILTINS (1)
 #define MICROPY_VFS_POSIX_FILE      (1)
 #define MICROPY_PY_FUNCTION_ATTRS   (1)

diff --git a/ports/windows/mpconfigport.h b/ports/windows/mpconfigport.h
@@ -60,6 +60,7 @@
 #define MICROPY_STREAMS_POSIX_API   (1)
 #define MICROPY_OPT_COMPUTED_GOTO   (0)
 #define MICROPY_MODULE_WEAK_LINKS   (1)
+#define MICROPY_MODULE_OVERRIDE_MAIN_IMPORT (1)
 #define MICROPY_CAN_OVERRIDE_BUILTINS (1)
 #define MICROPY_VFS_POSIX_FILE      (1)
 #define MICROPY_PY_FUNCTION_ATTRS   (1)