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Minimize Python startup imports (#292)

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* get_exports_list should return list
* remove unintentional `CC=clang` in makefile
* avoid importing sysconfig during startup

site.py requires only a couple of functions from sysconfig, but needs to
load the entirety of sysconfig to get those functions. This commit
makes it such that sysconfig is imported only when sys.platform is darwin.

* remove redundant constants from stat module

The constants are only there in case the C implementation (ie the _stat
module) is not available. With Cosmopolitan the _stat module is always
available. The entire Lib/stat.py file can be removed if the Windows-based
constants can be moved into the Modules/_stat.c.

* minimal changes to os.py

python checks os-based assumptions at startup, some of  which can be
bypassed since this is Cosmopolitan Python.
This commit is contained in:
Gautham 2021-10-26 02:34:04 +05:30 committed by GitHub
parent 253ac31a64
commit 49db877fbe
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
8 changed files with 47 additions and 185 deletions
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3
dsp/core/core.mk
View file

@ -51,9 +51,6 @@ o/$(MODE)/dsp/core/scalevolume.o: \
OVERRIDE_CFLAGS += \
$(MATHEMATICAL)
o/$(MODE)/dsp/core/alaw.o: \
CC = clang
o/tiny/dsp/core/scalevolume.o: \
OVERRIDE_CFLAGS += \
-Os

2
third_party/python/Lib/logging/handlers.py vendored
View file

@ -24,7 +24,7 @@ To use, simply 'import logging.handlers' and log away!
"""
import logging, socket, os, pickle, struct, time, re
from stat import ST_DEV, ST_INO, ST_MTIME
from _stat import ST_DEV, ST_INO, ST_MTIME
import queue
try:
import threading

19
third_party/python/Lib/os.py vendored
View file

@ -38,24 +38,15 @@ def _exists(name):
return name in globals()
def _get_exports_list(module):
try:
return list(module.__all__)
except AttributeError:
return [n for n in dir(module) if n[0] != '_']
return list(getattr(module, "__all__", (n for n in dir(module) if n[0] != '_')))
name = 'posix'
linesep = '\n'
from posix import *
try:
from posix import _exit
__all__.append('_exit')
except ImportError:
pass
from posix import _exit
__all__.append('_exit')
import posixpath as path
try:
from posix import _have_functions
except ImportError:
pass
from posix import _have_functions
import posix
__all__.extend(_get_exports_list(posix))
del posix
@ -67,7 +58,7 @@ from os.path import (curdir, pardir, sep, pathsep, defpath, extsep, altsep,
del _names
if _exists("_have_functions"):
if True or _exists("_have_functions"):
_globals = globals()
def _add(str, fn):
if (fn in _globals) and (str in _have_functions):

2
third_party/python/Lib/pathlib.py vendored
View file

@ -11,7 +11,7 @@ from collections.abc import Sequence
from contextlib import contextmanager
from errno import EINVAL, ENOENT, ENOTDIR
from operator import attrgetter
from stat import S_ISDIR, S_ISLNK, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO
from _stat import S_ISDIR, S_ISLNK, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO
from urllib.parse import quote_from_bytes as urlquote_from_bytes
from posix import _getfinalpathname

44
third_party/python/Lib/site.py vendored
View file

@ -234,6 +234,35 @@ def check_enableusersite():
return True
def _getuserbase():
env_base = os.environ.get("PYTHONUSERBASE", None)
def joinuser(*args):
return os.path.expanduser(os.path.join(*args))
if os.name == "nt":
base = os.environ.get("APPDATA") or "~"
if env_base:
return env_base
else:
return joinuser(base, "Python")
if sys.platform == "darwin":
from sysconfig import get_config_var
framework = get_config_var("PYTHONFRAMEWORK")
if framework:
if env_base:
return env_base
else:
return joinuser("~", "Library", framework, "%d.%d" %
sys.version_info[:2])
if env_base:
return env_base
else:
return joinuser("~", ".local")
def getuserbase():
"""Returns the `user base` directory path.
@ -244,8 +273,7 @@ def getuserbase():
global USER_BASE
if USER_BASE is not None:
return USER_BASE
from sysconfig import get_config_var
USER_BASE = get_config_var('userbase')
USER_BASE = _getuserbase()
return USER_BASE
def getusersitepackages():
@ -255,20 +283,22 @@ def getusersitepackages():
function will also set it.
"""
global USER_SITE
user_base = getuserbase() # this will also set USER_BASE
if USER_SITE is not None:
return USER_SITE
from sysconfig import get_path
if sys.platform == 'darwin':
from sysconfig import get_config_var
from sysconfig import get_config_var, get_path
if get_config_var('PYTHONFRAMEWORK'):
USER_SITE = get_path('purelib', 'osx_framework_user')
return USER_SITE
USER_SITE = get_path('purelib', '%s_user' % os.name)
user_base = getuserbase() # this will also set USER_BASE
purelib_map = {
"posix_user":'{userbase}/lib/python3.6/site-packages',
"nt_user": "{userbase}/Python36/site-packages",
}
USER_SITE = purelib_map.get('%s_user' % os.name).format(userbase=user_base)
return USER_SITE
def addusersitepackages(known_paths):

153
third_party/python/Lib/stat.py vendored
View file

@ -3,151 +3,7 @@
Suggested usage: from stat import *
"""
# Indices for stat struct members in the tuple returned by os.stat()
ST_MODE = 0
ST_INO = 1
ST_DEV = 2
ST_NLINK = 3
ST_UID = 4
ST_GID = 5
ST_SIZE = 6
ST_ATIME = 7
ST_MTIME = 8
ST_CTIME = 9
# Extract bits from the mode
def S_IMODE(mode):
"""Return the portion of the file's mode that can be set by
os.chmod().
"""
return mode & 0o7777
def S_IFMT(mode):
"""Return the portion of the file's mode that describes the
file type.
"""
return mode & 0o170000
# Constants used as S_IFMT() for various file types
# (not all are implemented on all systems)
S_IFDIR = 0o040000 # directory
S_IFCHR = 0o020000 # character device
S_IFBLK = 0o060000 # block device
S_IFREG = 0o100000 # regular file
S_IFIFO = 0o010000 # fifo (named pipe)
S_IFLNK = 0o120000 # symbolic link
S_IFSOCK = 0o140000 # socket file
# Functions to test for each file type
def S_ISDIR(mode):
"""Return True if mode is from a directory."""
return S_IFMT(mode) == S_IFDIR
def S_ISCHR(mode):
"""Return True if mode is from a character special device file."""
return S_IFMT(mode) == S_IFCHR
def S_ISBLK(mode):
"""Return True if mode is from a block special device file."""
return S_IFMT(mode) == S_IFBLK
def S_ISREG(mode):
"""Return True if mode is from a regular file."""
return S_IFMT(mode) == S_IFREG
def S_ISFIFO(mode):
"""Return True if mode is from a FIFO (named pipe)."""
return S_IFMT(mode) == S_IFIFO
def S_ISLNK(mode):
"""Return True if mode is from a symbolic link."""
return S_IFMT(mode) == S_IFLNK
def S_ISSOCK(mode):
"""Return True if mode is from a socket."""
return S_IFMT(mode) == S_IFSOCK
# Names for permission bits
S_ISUID = 0o4000 # set UID bit
S_ISGID = 0o2000 # set GID bit
S_ENFMT = S_ISGID # file locking enforcement
S_ISVTX = 0o1000 # sticky bit
S_IREAD = 0o0400 # Unix V7 synonym for S_IRUSR
S_IWRITE = 0o0200 # Unix V7 synonym for S_IWUSR
S_IEXEC = 0o0100 # Unix V7 synonym for S_IXUSR
S_IRWXU = 0o0700 # mask for owner permissions
S_IRUSR = 0o0400 # read by owner
S_IWUSR = 0o0200 # write by owner
S_IXUSR = 0o0100 # execute by owner
S_IRWXG = 0o0070 # mask for group permissions
S_IRGRP = 0o0040 # read by group
S_IWGRP = 0o0020 # write by group
S_IXGRP = 0o0010 # execute by group
S_IRWXO = 0o0007 # mask for others (not in group) permissions
S_IROTH = 0o0004 # read by others
S_IWOTH = 0o0002 # write by others
S_IXOTH = 0o0001 # execute by others
# Names for file flags
UF_NODUMP = 0x00000001 # do not dump file
UF_IMMUTABLE = 0x00000002 # file may not be changed
UF_APPEND = 0x00000004 # file may only be appended to
UF_OPAQUE = 0x00000008 # directory is opaque when viewed through a union stack
UF_NOUNLINK = 0x00000010 # file may not be renamed or deleted
UF_COMPRESSED = 0x00000020 # OS X: file is hfs-compressed
UF_HIDDEN = 0x00008000 # OS X: file should not be displayed
SF_ARCHIVED = 0x00010000 # file may be archived
SF_IMMUTABLE = 0x00020000 # file may not be changed
SF_APPEND = 0x00040000 # file may only be appended to
SF_NOUNLINK = 0x00100000 # file may not be renamed or deleted
SF_SNAPSHOT = 0x00200000 # file is a snapshot file
_filemode_table = (
((S_IFLNK, "l"),
(S_IFREG, "-"),
(S_IFBLK, "b"),
(S_IFDIR, "d"),
(S_IFCHR, "c"),
(S_IFIFO, "p")),
((S_IRUSR, "r"),),
((S_IWUSR, "w"),),
((S_IXUSR|S_ISUID, "s"),
(S_ISUID, "S"),
(S_IXUSR, "x")),
((S_IRGRP, "r"),),
((S_IWGRP, "w"),),
((S_IXGRP|S_ISGID, "s"),
(S_ISGID, "S"),
(S_IXGRP, "x")),
((S_IROTH, "r"),),
((S_IWOTH, "w"),),
((S_IXOTH|S_ISVTX, "t"),
(S_ISVTX, "T"),
(S_IXOTH, "x"))
)
def filemode(mode):
"""Convert a file's mode to a string of the form '-rwxrwxrwx'."""
perm = []
for table in _filemode_table:
for bit, char in table:
if mode & bit == bit:
perm.append(char)
break
else:
perm.append("-")
return "".join(perm)
from _stat import *
# Windows FILE_ATTRIBUTE constants for interpreting os.stat()'s
# "st_file_attributes" member
@ -170,12 +26,5 @@ FILE_ATTRIBUTE_SYSTEM = 4
FILE_ATTRIBUTE_TEMPORARY = 256
FILE_ATTRIBUTE_VIRTUAL = 65536
# If available, use C implementation
try:
from _stat import *
except ImportError:
pass
if __name__ == 'PYOBJ.COM':
import _stat

7
third_party/python/Lib/test/test_stat.py vendored
View file

@ -4,10 +4,8 @@ import sys
from test.support import TESTFN, import_fresh_module
c_stat = import_fresh_module('stat', fresh=['_stat'])
py_stat = import_fresh_module('stat', blocked=['_stat'])
assert c_stat
assert py_stat
class TestFilemode:
statmod = None
@ -228,11 +226,6 @@ class TestFilemodeCStat(TestFilemode, unittest.TestCase):
format_funcs = TestFilemode.format_funcs | {'S_ISDOOR', 'S_ISPORT',
'S_ISWHT'}
class TestFilemodePyStat(TestFilemode, unittest.TestCase):
statmod = py_stat
if __name__ == '__main__':
unittest.main()

2
third_party/python/Modules/posixmodule.c vendored
View file

@ -78,6 +78,8 @@
PYTHON_PROVIDE("posix");
PYTHON_PROVIDE("posix._getfinalpathname");
PYTHON_PROVIDE("posix._exit");
PYTHON_PROVIDE("posix._have_functions");
/* POSIX module implementation */