micropython/py
Jim Mussared 525557738c py/builtinimport: Optimise sub-package loading.
This makes it so that sub-packages are resolved relative to their parent's
`__path__`, rather than re-resolving each parent's filesystem path.

The previous behavior was that `import foo.bar` would first re-search
`sys.path` for `foo`, then use the resulting path to find `bar`.

For already-loaded and u-prefixed modules, because we no longer need to
build the path from level to level, we no longer unnecessarily search
the filesystem. This should improve startup time.

Explicitly makes the resolving process clear:
 - Loaded modules are returned immediately without touching the filesystem.
 - Exact-match of builtins are also returned immediately.
 - Then the filesystem search happens.
 - If that fails, then the weak-link handling is applied.

This maintains the existing behavior: if a user writes `import time` they
will get time.py if it exits, otherwise the built-in utime. Whereas `import
utime` will always return the built-in.

This also fixes a regression from a7fa18c203
where we search the filesystem for built-ins. It is now only possible to
override u-prefixed builtins. This will remove a lot of filesystem stats
at startup, as micropython-specific modules (e.g. `pyb`) will no longer
attempt to look at the filesystem.

Added several improvements to the comments and some minor renaming and
refactoring to make it clearer how the import mechanism works. Overall
code size diff is +56 bytes on STM32.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
2023-06-01 16:21:21 +10:00
..
argcheck.c
asmarm.c
asmarm.h
asmbase.c
asmbase.h
asmthumb.c
asmthumb.h
asmx64.c
asmx64.h
asmx86.c
asmx86.h
asmxtensa.c
asmxtensa.h
bc.c
bc.h
bc0.h
binary.c
binary.h
builtin.h
builtinevex.c
builtinhelp.c
builtinimport.c py/builtinimport: Optimise sub-package loading. 2023-06-01 16:21:21 +10:00
compile.c
compile.h
dynruntime.h
dynruntime.mk
emit.h
emitbc.c
emitcommon.c
emitglue.c
emitglue.h
emitinlinethumb.c
emitinlinextensa.c
emitnarm.c
emitnative.c
emitnthumb.c
emitnx64.c
emitnx86.c
emitnxtensa.c
emitnxtensawin.c
formatfloat.c
formatfloat.h
frozenmod.c
frozenmod.h
gc.c
gc.h
grammar.h
lexer.c
lexer.h
make_root_pointers.py
makecompresseddata.py
makemoduledefs.py
makeqstrdata.py
makeqstrdefs.py
makeversionhdr.py
malloc.c
map.c
misc.h
mkenv.mk
mkrules.cmake
mkrules.mk
modarray.c
modbuiltins.c
modcmath.c
modcollections.c
modgc.c
modio.c
modmath.c
modmicropython.c
modstruct.c
modsys.c
modthread.c
moduerrno.c
mpconfig.h
mperrno.h
mphal.h
mpprint.c
mpprint.h
mpstate.c
mpstate.h
mpthread.h
mpz.c
mpz.h
nativeglue.c
nativeglue.h
nlr.c
nlr.h
nlraarch64.c
nlrmips.c
nlrpowerpc.c
nlrsetjmp.c
nlrthumb.c
nlrx64.c
nlrx86.c
nlrxtensa.c
obj.c py/obj: Accept user types in mp_obj_get_int_maybe. 2023-06-01 14:18:54 +10:00
obj.h py/builtinimport: Optimise sub-package loading. 2023-06-01 16:21:21 +10:00
objarray.c py/objarray: Disallow memoryview addition. 2023-05-19 13:33:54 +10:00
objarray.h
objattrtuple.c
objbool.c
objboundmeth.c
objcell.c
objclosure.c
objcomplex.c
objdeque.c
objdict.c py/objdict: Fix __hash__ for dict_view types. 2023-05-19 12:06:17 +10:00
objenumerate.c
objexcept.c
objexcept.h
objfilter.c
objfloat.c
objfun.c
objfun.h
objgenerator.c
objgenerator.h
objgetitemiter.c
objint.c py/objint: Allow int() to parse anything with the buffer protocol. 2023-06-01 15:11:06 +10:00
objint.h
objint_longlong.c py: Change MP_UNARY_OP_INT to MP_UNARY_OP_INT_MAYBE. 2023-06-01 13:01:07 +10:00
objint_mpz.c py: Change MP_UNARY_OP_INT to MP_UNARY_OP_INT_MAYBE. 2023-06-01 13:01:07 +10:00
objlist.c
objlist.h
objmap.c
objmodule.c py/builtinimport: Optimise sub-package loading. 2023-06-01 16:21:21 +10:00
objmodule.h py/builtinimport: Optimise sub-package loading. 2023-06-01 16:21:21 +10:00
objnamedtuple.c
objnamedtuple.h
objnone.c
objobject.c
objpolyiter.c
objproperty.c
objrange.c
objreversed.c
objset.c
objsingleton.c
objslice.c py/objslice: Ensure slice is not hashable. 2023-05-19 12:06:06 +10:00
objstr.c py/objstr: Return unsupported binop instead of raising TypeError. 2023-05-19 13:42:35 +10:00
objstr.h
objstringio.c
objstringio.h
objstrunicode.c
objtuple.c
objtuple.h
objtype.c py: Change MP_UNARY_OP_INT to MP_UNARY_OP_INT_MAYBE. 2023-06-01 13:01:07 +10:00
objtype.h
objzip.c
opmethods.c
pairheap.c
pairheap.h
parse.c
parse.h
parsenum.c
parsenum.h
parsenumbase.c
parsenumbase.h
persistentcode.c
persistentcode.h
profile.c
profile.h
py.cmake
py.mk
pystack.c
pystack.h
qstr.c
qstr.h
qstrdefs.h
reader.c
reader.h
repl.c
repl.h
ringbuf.c
ringbuf.h
runtime.c py/builtinimport: Optimise sub-package loading. 2023-06-01 16:21:21 +10:00
runtime.h py: Change MP_UNARY_OP_INT to MP_UNARY_OP_INT_MAYBE. 2023-06-01 13:01:07 +10:00
runtime0.h py: Change MP_UNARY_OP_INT to MP_UNARY_OP_INT_MAYBE. 2023-06-01 13:01:07 +10:00
runtime_utils.c
scheduler.c
scope.c
scope.h
sequence.c
showbc.c
smallint.c
smallint.h
stackctrl.c
stackctrl.h
stream.c
stream.h
unicode.c
unicode.h
usermod.cmake
vm.c
vmentrytable.h
vstr.c
warning.c