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# ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D162668
82 lines
2.8 KiB
Python
82 lines
2.8 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this file,
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# You can obtain one at http://mozilla.org/MPL/2.0/.
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import json
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import os
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import posixpath
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from os import PathLike
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# `typing.Literal` not available until Python 3.8;
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# `typing_extensions` not generally available here
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from typing import Iterable, Set
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FIRST_LINE = "// This file was generated by {}. DO NOT EDIT.".format(
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# `posixpath` for forward slashes, for presentation purposes
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posixpath.relpath(__file__, os.getenv("TOPSRCDIR", "/"))
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)
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def generate_allowed_items(
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which: str, # should be: Literal["files", "names"],
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paths: Iterable[PathLike],
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) -> str:
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def remove_trailing_comment(s: str) -> str:
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return s[0 : s.find("#")]
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def read_items_from_path(path: PathLike) -> Set[str]:
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out = set()
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with open(path) as file:
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for line in file.readlines():
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line = remove_trailing_comment(line).strip()
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if not line:
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continue # comment or empty line; discard
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out.add(line)
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return out
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allowed = set().union(*(read_items_from_path(path) for path in paths))
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# BUG: `json.dumps` may not correctly handle use of the quote character in
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# thread names
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allowed_list_s = ",\n ".join(json.dumps(elem) for elem in sorted(allowed))
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return f"""\
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static const char *allow_thread_{which}[] = {{
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{allowed_list_s}
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}};"""
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def generate_allows(
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*, allowed_names: Iterable[PathLike], allowed_files: Iterable[PathLike]
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) -> str:
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"""
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This function reads in the specified sets of files -- ordinarily,
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["ThreadAllows.txt"] and ["ThreadFileAllows.txt"] -- and generates the text
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of a header file containing two arrays with their contents, for inclusion by
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the thread-name checker.
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The checker will reject the creation of any thread via NS_NewNamedThread
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unless either:
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- the thread's name is a literal string which is found in the set of
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allowed thread names; or
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- the thread's creation occurs within a file which is found in the set of
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unchecked files.
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The latter condition exists mostly for the definition of NS_NewNamedThread,
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but there also exist a few cases where the thread name is dynamically
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computed (and so can't be checked).
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"""
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output_string = (
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FIRST_LINE
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+ "\n\n"
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+ generate_allowed_items("files", allowed_files)
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+ "\n\n"
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+ generate_allowed_items("names", allowed_names)
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+ "\n"
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)
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return output_string
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# Entry point used by build/clang-plugin/moz.build (q.v.).
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def generate_file(output, allowed_names, allowed_files):
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output.write(
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generate_allows(allowed_names=[allowed_names], allowed_files=[allowed_files])
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)
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