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955747b4da
Implement the basic API for reading pseudo-merge bitmaps, which consists
of four basic functions:
- pseudo_merge_bitmap()
- use_pseudo_merge()
- apply_pseudo_merges_for_commit()
- cascade_pseudo_merges()
These functions are all documented in pseudo-merge.h, but their rough
descriptions are as follows:
- pseudo_merge_bitmap() reads and inflates the objects EWAH bitmap for
a given pseudo-merge
- use_pseudo_merge() does the same as pseudo_merge_bitmap(), but on
the commits EWAH bitmap, not the objects bitmap
- apply_pseudo_merges_for_commit() applies all satisfied pseudo-merge
commits for a given result set, and cascades any yet-unsatisfied
pseudo-merges if any were applied in the previous step
- cascade_pseudo_merges() applies all pseudo-merges which are
satisfied but have not been previously applied, repeating this
process until no more pseudo-merges can be applied
The core of the API is the latter two functions, which are responsible
for applying pseudo-merges during the object traversal implemented in
the pack-bitmap machinery.
The other two functions (pseudo_merge_bitmap(), and use_pseudo_merge())
are low-level ways to interact with the pseudo-merge machinery, which
will be useful in future commits.
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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