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author | Pirama Arumuga Nainar <pirama@google.com> | 2020-10-22 06:32:58 +0000 |
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committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | 2020-10-22 06:32:58 +0000 |
commit | 12fcdf982e5199bb0f830898765cdbe61c62badf (patch) | |
tree | 073e9e403bc6e2290b2b5b005a5cfdabadde1e42 /debug_info_test/allowlist.py | |
parent | 740c99ffa8d6b5197e1bd99af4863a7ac810f8a0 (diff) | |
parent | 1e576757bc040ab78407dea41218ed640277fc11 (diff) | |
download | toolchain-utils-12fcdf982e5199bb0f830898765cdbe61c62badf.tar.gz |
Merging 84 commit(s) from Chromium's toolchain-utils am: 1e576757bc
Original change: https://android-review.googlesource.com/c/platform/external/toolchain-utils/+/1469797
Change-Id: I9b1cd41e1cd7d67b963f80c582431b9516bf474f
Diffstat (limited to 'debug_info_test/allowlist.py')
-rw-r--r-- | debug_info_test/allowlist.py | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/debug_info_test/allowlist.py b/debug_info_test/allowlist.py new file mode 100644 index 00000000..9cf42af0 --- /dev/null +++ b/debug_info_test/allowlist.py @@ -0,0 +1,68 @@ +# -*- coding: utf-8 -*- +# Copyright 2018 The Chromium OS Authors. All rights reserved. +# Use of this source code is governed by a BSD-style license that can be +# found in the LICENSE file. + +"""Allowlist functions.""" + +from __future__ import print_function + +import glob +import os +import re + + +# Matching a string of length m in an NFA of size n is O(mn^2), but the +# performance also depends largely on the implementation. It appears to be fast +# enough according to the tests. +# +# The performance bottleneck of this script is readelf. Unless this becomes +# slower than readelf, don't waste time here. +def is_allowlisted(list_name, pattern): + """Check whether the given pattern is specified in the allowlist. + + Args: + list_name: name of the allowlist. + pattern: the target string. + + Returns: + True if matched otherwise False. + """ + return pattern and allowlists[list_name].match(pattern) + + +def prepare_allowlist(patterns): + """Join and compile the re patterns. + + Args: + patterns: regex patterns. + + Returns: + A compiled re object. + """ + return re.compile('|'.join(patterns)) + + +def load_allowlists(dirname): + """Load allowlists under dirname. + + An allowlist ends with .allowlist. + + Args: + dirname: path to the dir. + + Returns: + A dictionary of 'filename' -> allowlist matcher. + """ + wlist = {} + for fn in glob.glob(os.path.join(dirname, '*.allowlist')): + key = os.path.splitext(os.path.basename(fn))[0] + with open(fn, 'r', encoding='utf-8') as f: + patterns = f.read().splitlines() + patterns = [l for l in patterns if l != ''] + patterns = [l for l in patterns if l[0] != '#'] + wlist[key] = prepare_allowlist(patterns) + return wlist + + +allowlists = load_allowlists(os.path.dirname(__file__)) |