comparison mercurial/obsolete.py @ 24019:26fbf07482b2

_fm1readmarkers: generate list in C

This moves perfloadmarkers from
! result: 63866
! wall 0.239217 comb 0.250000 user 0.240000 sys 0.010000 (best of 42)

to

! result: 63866
! wall 0.218795 comb 0.210000 user 0.210000 sys 0.000000 (best of 46)

24018:26d6a6a78c1d

_fm1parentshift = 14
_fm1parentmask = (_fm1parentnone << _fm1parentshift)
_fm1metapair = 'BB'
_fm1metapairsize = _calcsize('BB')

def _fm1readmarkers(data, off):
    # make some global constants local for performance
    noneflag = _fm1parentnone
    sha2flag = usingsha256
    sha1size = _fm1nodesha1size
    sha2size = _fm1nodesha256size

    unpack = _unpack

    # Loop on markers
    stop = len(data) - _fm1fsize
    ufixed = util.unpacker(_fm1fixed)

    fast = getattr(parsers, 'fm1readmarker', None)
    if fast is not None:
        while off <= stop:
            ret = fast(data, off)
            yield ret[1:]
            off += ret[0]
        return

    while off <= stop:
        # read fixed part
        o1 = off + fsize
        t, secs, tz, flags, numsuc, numpar, nummeta, prec = ufixed(data[off:o1])

    data = [_pack(format, *data)]
    for key, value in metadata:
        data.append(key)
        data.append(value)
    return ''.join(data)

# mapping to read/write various marker formats
# <version> -> (decoder, encoder)
formats = {_fm0version: (_fm0readmarkers, _fm0encodeonemarker),
           _fm1version: (_fm1readmarkers, _fm1encodeonemarker)}

24019:26fbf07482b2

_fm1parentshift = 14
_fm1parentmask = (_fm1parentnone << _fm1parentshift)
_fm1metapair = 'BB'
_fm1metapairsize = _calcsize('BB')

def _fm1purereadmarkers(data, off):
    # make some global constants local for performance
    noneflag = _fm1parentnone
    sha2flag = usingsha256
    sha1size = _fm1nodesha1size
    sha2size = _fm1nodesha256size

    unpack = _unpack

    # Loop on markers
    stop = len(data) - _fm1fsize
    ufixed = util.unpacker(_fm1fixed)

    while off <= stop:
        # read fixed part
        o1 = off + fsize
        t, secs, tz, flags, numsuc, numpar, nummeta, prec = ufixed(data[off:o1])

    data = [_pack(format, *data)]
    for key, value in metadata:
        data.append(key)
        data.append(value)
    return ''.join(data)

def _fm1readmarkers(data, off):
    native = getattr(parsers, 'fm1readmarkers', None)
    if not native:
        return _fm1purereadmarkers(data, off)
    stop = len(data) - _fm1fsize
    return native(data, off, stop)

# mapping to read/write various marker formats
# <version> -> (decoder, encoder)
formats = {_fm0version: (_fm0readmarkers, _fm0encodeonemarker),
           _fm1version: (_fm1readmarkers, _fm1encodeonemarker)}