# HG changeset patch # User Boris Feld <boris.f...@octobus.net> # Date 1541785348 -3600 # Fri Nov 09 18:42:28 2018 +0100 # Node ID 524f8117280d1a36301653c463f969fbc2391a7c # Parent b77a6b74ef31e1b3706c1c6127a15eede0334f71 # EXP-Topic sparse-perf # Available At https://bitbucket.org/octobus/mercurial-devel/ # hg pull https://bitbucket.org/octobus/mercurial-devel/ -r 524f8117280d sparse-revlog: add a `index_get_start` function in C
We are about to implement a native version of `slicechunktodensity`. For clarity, we introduce the helper functions first. This new function provides an efficient way to retrieve some of the information needed by `slicechunktodensity`. diff --git a/mercurial/cext/revlog.c b/mercurial/cext/revlog.c --- a/mercurial/cext/revlog.c +++ b/mercurial/cext/revlog.c @@ -179,6 +179,27 @@ static inline int index_get_parents(inde return 0; } +static inline uint64_t index_get_start(indexObject *self, Py_ssize_t rev) +{ + uint64_t offset; + if (rev >= self->length) { + PyObject *tuple = + PyList_GET_ITEM(self->added, rev - self->length); + offset = (uint64_t)PyInt_AS_LONG(PyTuple_GET_ITEM(tuple, 0)); + } else { + const char *data = index_deref(self, rev); + offset = getbe32(data + 4); + if (rev == 0) /* mask out version number for the first entry */ + offset &= 0xFFFF; + else { + uint32_t offset_high = getbe32(data); + offset |= ((uint64_t)offset_high) << 32; + } + } + offset = offset >> 16; + return offset; +} + /* * RevlogNG format (all in big endian, data may be inlined): * 6 bytes: offset _______________________________________________ Mercurial-devel mailing list Mercurial-devel@mercurial-scm.org https://www.mercurial-scm.org/mailman/listinfo/mercurial-devel