Mercurial > hg-stable
changeset 23803:2763edaba857
readmarkers: promote global constants to locals for performance
| author | Matt Mackall <mpm@selenic.com> |
|---|---|
| date | Sun, 11 Jan 2015 15:35:09 -0600 |
| parents | a3b010f84c57 |
| children | e880036719e3 |
| files | mercurial/obsolete.py |
| diffstat | 1 files changed, 26 insertions(+), 14 deletions(-) [+] |
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--- a/mercurial/obsolete.py Sun Jan 11 14:52:57 2015 -0600 +++ b/mercurial/obsolete.py Sun Jan 11 15:35:09 2015 -0600 @@ -286,42 +286,54 @@ _fm1metapairsize = _calcsize('BB') def _fm1readmarkers(data, off=0): + # make some global constants local for performance + noneflag = _fm1parentnone + sha2flag = usingsha256 + sha1size = _fm1nodesha1size + sha2size = _fm1nodesha256size + sha1fmt = _fm1nodesha1 + sha2fmt = _fm1nodesha256 + metasize = _fm1metapairsize + metafmt = _fm1metapair + fsize = _fm1fsize + unpack = _unpack + # Loop on markers stop = len(data) - _fm1fsize ufixed = util.unpacker(_fm1fixed) while off <= stop: # read fixed part - o1 = off + _fm1fsize + o1 = off + fsize t, secs, tz, flags, numsuc, numpar, nummeta, prec = ufixed(data[off:o1]) - if flags & usingsha256: + if flags & sha2flag: # read 0 or more successors - o2 = o1 + _fm1nodesha256size * numsuc - sucs = _unpack(_fm1nodesha256 * numsuc, data[o1:o2]) + o2 = o1 + sha2size * numsuc + sucs = unpack(sha2fmt * numsuc, data[o1:o2]) # read parents - if numpar == _fm1parentnone: + if numpar == noneflag: o3 = o2 parents = None else: - o3 = o2 + _fm1nodesha256size * numpar - parents = _unpack(_fm1nodesha256 * numpar, data[o2:o3]) + o3 = o2 + sha2size * numpar + parents = unpack(sha2fmt * numpar, data[o2:o3]) else: # read 0 or more successors - o2 = o1 + _fm1nodesha1size * numsuc - sucs = _unpack(_fm1nodesha1 * numsuc, data[o1:o2]) + o2 = o1 + sha1size * numsuc + sucs = unpack(sha1fmt * numsuc, data[o1:o2]) # read parents - if numpar == _fm1parentnone: + if numpar == noneflag: o3 = o2 parents = None else: - o3 = o2 + _fm1nodesha1size * numpar - parents = _unpack(_fm1nodesha1 * numpar, data[o2:o3]) + o3 = o2 + sha1size * numpar + parents = unpack(sha1fmt * numpar, data[o2:o3]) # read metadata - off = o3 + _fm1metapairsize * nummeta - metapairsize = _unpack('>' + (_fm1metapair * nummeta), data[o3:off]) + off = o3 + metasize * nummeta + metapairsize = unpack('>' + (metafmt * nummeta), data[o3:off]) metadata = [] for idx in xrange(0, len(metapairsize), 2): o1 = off + metapairsize[idx]