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py/builtinimport: Remove weak links. 

In order to keep "import umodule" working, the existing mechanism is
replaced with a simple fallback to drop the "u".

This makes importing of built-ins no longer touch the filesystem, which
makes a typical built-in import take ~0.15ms rather than 3-5ms.

(Weak links were added in c14a81662c)

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
This commit is contained in:
Jim Mussared 2022-08-17 16:21:03 +10:00
parent 30628d1bb7
commit dfe232d000
9 changed files with 5 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
docs/develop/porting.rst
View File

@ -151,9 +151,6 @@ The following is an example of an ``mpconfigport.h`` file:
#define MICROPY_ERROR_REPORTING (MICROPY_ERROR_REPORTING_TERSE)
#define MICROPY_FLOAT_IMPL (MICROPY_FLOAT_IMPL_FLOAT)
// Enable u-modules to be imported with their standard name, like sys.
#define MICROPY_MODULE_WEAK_LINKS (1)
// Fine control over Python builtins, classes, modules, etc.
#define MICROPY_PY_ASYNC_AWAIT (0)
#define MICROPY_PY_BUILTINS_SET (0)

1
ports/cc3200/mpconfigport.h
View File

@ -71,7 +71,6 @@
#define MICROPY_FATFS_SYNC_T SemaphoreHandle_t
#define MICROPY_STREAMS_NON_BLOCK (1)
#define MICROPY_MODULE_WEAK_LINKS (1)
#define MICROPY_CAN_OVERRIDE_BUILTINS (1)
#define MICROPY_USE_INTERNAL_ERRNO (1)
#define MICROPY_VFS (1)

1
ports/nrf/mpconfigport.h
View File

@ -137,7 +137,6 @@
#define MICROPY_PY_UOS (0)
#define MICROPY_STREAMS_NON_BLOCK (1)
#define MICROPY_MODULE_WEAK_LINKS (1)
#define MICROPY_CAN_OVERRIDE_BUILTINS (1)
#define MICROPY_USE_INTERNAL_ERRNO (1)
#if MICROPY_HW_USB_CDC_1200BPS_TOUCH

1
ports/samd/mpconfigport.h
View File

@ -59,7 +59,6 @@
#define MICROPY_PY_BUILTINS_HELP_MODULES (1)
#define MICROPY_ENABLE_SCHEDULER (1)
#define MICROPY_SCHEDULER_STATIC_NODES (1)
#define MICROPY_MODULE_WEAK_LINKS (1)
#define MICROPY_HW_ENABLE_USBDEV (1)
#define MICROPY_HW_USB_CDC_1200BPS_TOUCH (1)

1
ports/windows/mpconfigport.h
View File

@ -72,7 +72,6 @@
#endif
#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)
#ifndef MICROPY_ENABLE_SCHEDULER

1
ports/zephyr/mpconfigport.h
View File

@ -69,7 +69,6 @@
#define MICROPY_PY_MACHINE_SPI_MSB (SPI_TRANSFER_MSB)
#define MICROPY_PY_MACHINE_SPI_LSB (SPI_TRANSFER_LSB)
#define MICROPY_PY_MACHINE_PIN_MAKE_NEW mp_pin_make_new
#define MICROPY_MODULE_WEAK_LINKS (1)
#define MICROPY_PY_STRUCT (0)
#ifdef CONFIG_NETWORKING
// If we have networking, we likely want errno comfort

50
py/builtinimport.c
View File

@ -45,15 +45,6 @@
#define DEBUG_printf(...) (void)0
#endif
#if MICROPY_MODULE_WEAK_LINKS
STATIC qstr make_weak_link_name(vstr_t *buffer, qstr name) {
vstr_reset(buffer);
vstr_add_char(buffer, 'u');
vstr_add_str(buffer, qstr_str(name));
return qstr_from_strn(buffer->buf, buffer->len);
}
#endif
#if MICROPY_ENABLE_EXTERNAL_IMPORT
// Must be a string of one byte.
@ -391,13 +382,8 @@ STATIC mp_obj_t process_import_at_level(qstr full_mod_name, qstr level_mod_name,
if (outer_module_obj == MP_OBJ_NULL) {
DEBUG_printf("Searching for top-level module\n");
// An exact match of a built-in will always bypass the filesystem.
// Note that CPython-compatible built-ins are named e.g. utime, so this
// means that an exact match is only for `import utime`, so `import
// time` will search the filesystem and failing that hit the weak
// link handling below. Whereas micropython-specific built-ins like
// `micropython`, `pyb`, `network`, etc will match exactly and cannot
// be overridden by the filesystem.
// An import of a non-extensible built-in will always bypass the
// filesystem. e.g. `import micropython` or `import pyb`.
module_obj = mp_module_get_builtin(level_mod_name);
if (module_obj != MP_OBJ_NULL) {
return module_obj;
@ -417,20 +403,9 @@ STATIC mp_obj_t process_import_at_level(qstr full_mod_name, qstr level_mod_name,
// relative to all the locations in sys.path.
stat = stat_top_level(level_mod_name, &path);
#if MICROPY_MODULE_WEAK_LINKS
if (stat == MP_IMPORT_STAT_NO_EXIST) {
// No match on the filesystem. (And not a built-in either).
// If "foo" was requested, then try "ufoo" as a built-in. This
// allows `import time` to use built-in `utime`, unless `time`
// exists on the filesystem. This feature was formerly known
// as "weak links".
qstr umodule_name = make_weak_link_name(&path, level_mod_name);
module_obj = mp_module_get_builtin(umodule_name);
if (module_obj != MP_OBJ_NULL) {
return module_obj;
}
}
#endif
// TODO: If stat failed, now try extensible built-in modules.
// TODO: If importing `ufoo`, try `foo`.
} else {
DEBUG_printf("Searching for sub-module\n");
@ -667,21 +642,6 @@ mp_obj_t mp_builtin___import___default(size_t n_args, const mp_obj_t *args) {
return module_obj;
}
#if MICROPY_MODULE_WEAK_LINKS
// Check if the u-prefixed name is a built-in.
VSTR_FIXED(umodule_path, MICROPY_ALLOC_PATH_MAX);
qstr umodule_name_qstr = make_weak_link_name(&umodule_path, module_name_qstr);
module_obj = mp_module_get_builtin(umodule_name_qstr);
if (module_obj != MP_OBJ_NULL) {
return module_obj;
}
#elif MICROPY_PY_SYS
// Special handling to make `import sys` work even if weak links aren't enabled.
if (module_name_qstr == MP_QSTR_sys) {
return MP_OBJ_FROM_PTR(&mp_module_sys);
}
#endif
// Couldn't find the module, so fail
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_msg(&mp_type_ImportError, MP_ERROR_TEXT("module not found"));

5
py/mpconfig.h
View File

@ -871,11 +871,6 @@ typedef double mp_float_t;
#define MICROPY_MODULE_GETATTR (MICROPY_CONFIG_ROM_LEVEL_AT_LEAST_CORE_FEATURES)
#endif
// Whether module weak links are supported
#ifndef MICROPY_MODULE_WEAK_LINKS
#define MICROPY_MODULE_WEAK_LINKS (MICROPY_CONFIG_ROM_LEVEL_AT_LEAST_EXTRA_FEATURES)
#endif
// Whether to enable importing foo.py with __name__ set to '__main__'
// Used by the unix port for the -m flag.
#ifndef MICROPY_MODULE_OVERRIDE_MAIN_IMPORT

1
py/objmodule.c
View File

@ -169,7 +169,6 @@ STATIC const mp_rom_map_elem_t mp_builtin_module_table[] = {
// builtin modules declared with MP_REGISTER_MODULE()
MICROPY_REGISTERED_MODULES
};
MP_DEFINE_CONST_MAP(mp_builtin_module_map, mp_builtin_module_table);
// Attempts to find (and initialise) a builtin, otherwise returns