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248 lines (207 loc) · 6.67 KB
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#!/usr/bin/env python
import collections
import dataclasses
import pathlib
import re
import subprocess
import urllib.request
import tomllib
CPYTHON_VERSION = "3.14"
CONSTS_PATTERN = re.compile(r"\b_*[A-Z]+(?:_+[A-Z]+)*_*\b")
CARGO_TOML_FILE = pathlib.Path(__file__).parents[1] / "Cargo.toml"
CARGO_TOML = tomllib.loads(CARGO_TOML_FILE.read_text())
LIBC_DATA = CARGO_TOML["workspace"]["dependencies"]["libc"]
LIBC_VERSION = LIBC_DATA["version"] if isinstance(LIBC_DATA, dict) else LIBC_DATA
BASE_URL = f"https://raw.githubusercontent.com/rust-lang/libc/refs/tags/{LIBC_VERSION}"
EXCLUDE = frozenset(
{
# Defined at `vm/src/stdlib/os.rs`
"O_APPEND",
"O_CREAT",
"O_EXCL",
"O_RDONLY",
"O_RDWR",
"O_TRUNC",
"O_WRONLY",
"SEEK_CUR",
"SEEK_END",
"SEEK_SET",
# Functions, not consts
"WCOREDUMP",
"WIFCONTINUED",
"WIFSTOPPED",
"WIFSIGNALED",
"WIFEXITED",
"WEXITSTATUS",
"WSTOPSIG",
"WTERMSIG",
# False positive
# "EOF",
}
)
def rustfmt(code: str) -> str:
return subprocess.check_output(["rustfmt", "--emit=stdout"], input=code, text=True)
@dataclasses.dataclass(eq=True, frozen=True, slots=True)
class Cfg:
inner: str
def __str__(self) -> str:
return self.inner
def __lt__(self, other) -> bool:
si, oi = map(str, (self.inner, other.inner))
# Smaller length cfgs are smaller, regardless of value.
return (len(si), si) < (len(oi), oi)
@dataclasses.dataclass(frozen=True, kw_only=True, slots=True)
class Target:
cfgs: set[Cfg]
sources: set[str] = dataclasses.field(default_factory=set)
extras: set[str] = dataclasses.field(default_factory=set)
TARGETS = (
Target(
cfgs={Cfg('target_os = "android"')},
sources={
f"{BASE_URL}/src/unix/linux_like/android/mod.rs",
f"{BASE_URL}/libc-test/semver/android.txt",
},
),
Target(
cfgs={Cfg('target_os = "dragonfly"')},
sources={
f"{BASE_URL}/src/unix/bsd/freebsdlike/dragonfly/mod.rs",
f"{BASE_URL}/libc-test/semver/dragonfly.txt",
},
),
Target(
cfgs={Cfg('target_os = "freebsd"')},
sources={
f"{BASE_URL}/src/unix/bsd/freebsdlike/freebsd/mod.rs",
f"{BASE_URL}/libc-test/semver/freebsd.txt",
},
),
Target(
cfgs={Cfg('target_os = "linux"')},
sources={
f"{BASE_URL}/src/unix/linux_like/mod.rs",
f"{BASE_URL}/src/unix/linux_like/linux_l4re_shared.rs",
f"{BASE_URL}/libc-test/semver/linux.txt",
},
),
Target(
cfgs={Cfg('target_os = "macos"')},
sources={
f"{BASE_URL}/src/unix/bsd/apple/mod.rs",
f"{BASE_URL}/libc-test/semver/apple.txt",
},
extras={"COPYFILE_DATA as _COPYFILE_DATA"},
),
Target(
cfgs={Cfg('target_os = "netbsd"')},
sources={
f"{BASE_URL}/src/unix/bsd/netbsdlike/netbsd/mod.rs",
f"{BASE_URL}/libc-test/semver/netbsd.txt",
},
),
Target(
cfgs={Cfg('target_os = "redox"')},
sources={
f"{BASE_URL}/src/unix/redox/mod.rs",
f"{BASE_URL}/libc-test/semver/redox.txt",
},
),
Target(cfgs={Cfg("unix")}, sources={f"{BASE_URL}/libc-test/semver/unix.txt"}),
)
def extract_consts(
contents: str,
*,
pattern: re.Pattern = CONSTS_PATTERN,
exclude: frozenset[str] = EXCLUDE,
) -> frozenset[str]:
"""
Extract all words that are comprised from only uppercase letters + underscores.
Parameters
----------
contents : str
Contents to extract the constants from.
pattern : re.Pattern, Optional
RE compiled pattern for extracting the consts.
exclude : frozenset[str], Optional
Items to exclude from the returned value.
Returns
-------
frozenset[str]
All constant names.
"""
result = frozenset(pattern.findall(contents))
return result - exclude
def consts_from_url(
url: str, *, pattern: re.Pattern = CONSTS_PATTERN, exclude: frozenset[str] = EXCLUDE
) -> frozenset[str]:
"""
Extract all consts from the contents found at the given URL.
Parameters
----------
url : str
URL to fetch the contents from.
pattern : re.Pattern, Optional
RE compiled pattern for extracting the consts.
exclude : frozenset[str], Optional
Items to exclude from the returned value.
Returns
-------
frozenset[str]
All constant names at the URL.
"""
try:
with urllib.request.urlopen(url) as f:
contents = f.read().decode()
except urllib.error.HTTPError as err:
err.add_note(url)
raise
return extract_consts(contents, pattern=pattern, exclude=exclude)
def main():
# Step 1: Get all OS contants that we do want from upstream
wanted_consts = consts_from_url(
f"https://docs.python.org/{CPYTHON_VERSION}/library/os.html",
# TODO: Exclude matches if they have `(` after (those are functions)
pattern=re.compile(r"\bos\.(_*[A-Z]+(?:_+[A-Z]+)*_*)"),
)
# Step 2: build dict of what consts are available per cfg. `cfg -> {consts}`
available = collections.defaultdict(set)
for target in TARGETS:
consts = set()
for source in target.sources:
consts |= consts_from_url(source)
for cfg in target.cfgs:
available[cfg] |= consts
# Step 3: Keep only the "wanted" consts. Build a groupped mapping of `{cfgs} -> {consts}'
groups = collections.defaultdict(set)
available_items = available.items()
for wanted_const in wanted_consts:
cfgs = frozenset(
cfg for cfg, consts in available_items if wanted_const in consts
)
if not cfgs:
# We have no cfgs for a wanted const :/
continue
groups[cfgs].add(wanted_const)
# Step 4: Build output
output = ""
for cfgs, consts in sorted(groups.items(), key=lambda t: (len(t[0]), sorted(t[0]))):
target = next((target for target in TARGETS if target.cfgs == cfgs), None)
if target:
# If we found an exact target. Add its "extras" as-is
consts |= target.extras
cfgs_inner = ",".join(sorted(map(str, cfgs)))
if len(cfgs) >= 2:
cfgs_rust = f"#[cfg(any({cfgs_inner}))]"
else:
cfgs_rust = f"#[cfg({cfgs_inner})]"
imports = ",".join(consts)
entry = f"""
{cfgs_rust}
#[pyattr]
use libc::{{{imports}}};
""".strip()
output += f"{entry}\n\n"
print(rustfmt(output))
if __name__ == "__main__":
main()