Files
sousa-gecko/xpcom/ds/Atom.py
T
Emilio Cobos Álvarez bb460ea208 Bug 2046953 - Use HashBytes for hashing thin strings. r=sergesanspaille,arai,necko-reviewers,media-playback-reviewers,profiler-reviewers,alwu,canova,jesup,places-reviewers,Standard8
Hashing char by char is unnecessarily expensive, this hashes four bytes
at a time for those.

I did that rather than keeping size_t because HashBytes(uint64_t) ends
up in two AddUint32ToHash() anyways, and that way we avoid the python
re-implementation from depending on the word size of the target.

For wide strings, keep the current char-by-char version for now, but
reduce the amount of times this algorithm is duplicated and we rely on
it matching:

 * HashUTF8AsUTF16()
 * JS atoms
 * xpcom atoms.

Use constexpr to simplify the static atoms set up.

Differential Revision: https://phabricator.services.mozilla.com/D306312
2026-06-17 14:01:05 +00:00

10 lines
308 B
Python

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
class Atom:
def __init__(self, ident, string):
self.ident = ident
self.string = string