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#!/usr/bin/env python3
# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
import argparse
import re
import sys
if __name__ == "__main__":
parser = argparse.ArgumentParser(
description="Generate PageFlag() helpers from include/linux/page-flags.h"
)
args = parser.parse_args()
flags = {
# PageUptodate() isn't defined with PAGEFLAG because it needs
# additional memory barriers, but other than that it's the same.
"Uptodate": "uptodate",
}
for match in re.finditer(
r"\b(?:|__|TEST)PAGEFLAG\s*\(\s*(\w+)(?<!uname)\s*,\s*(\w+)\s*,\s*\w+\s*\)",
sys.stdin.read(),
):
if flags.setdefault(match.group(1), match.group(2)) != match.group(2):
sys.exit(f"{match.group('uname')} has multiple lowercase names?")
print(" # Generated by scripts/generate_page_flag_getters.py.")
for uname, lname in sorted(flags.items()):
print(f' "Page{uname}",')
print(")")
print()
for uname, lname in sorted(flags.items()):
print(
f'''
def Page{uname}(page: Object) -> bool:
"""
Return whether the ``PG_{lname}`` flag is set on a page.
:param page: ``struct page *``
"""
try:
flag = page.prog_["PG_{lname}"]
except KeyError:
return False
return bool(page_flags(page) & (1 << flag))
'''
)
print()
print("# End generated by scripts/generate_page_flag_getters.py.")
|
