Mercurial > hg
view relnotes/5.6 @ 50682:2cc5de261d76
rust-hg-core: move from `ouroboros` to `self_cell`
`ouroboros` has a fundamental soundness problem that, while not applicable
today, could become applicable given new compiler optimizations.ยน
`self_cell` is a crate that accomplishes a lot of the same things that
`ouroboros` did while remaining sound (that is, unless a new soundness issue
is discovered) by not assuming as much about the memory layout of the program.
`self_cell` has been scrutinized heavily in the past few months by very
competent people, some from the compiler team and has shown no weaknesses
for a while, with a 1.0 stable release coming out a couple months ago.
Our internal API is exactly the same, this is just an implementation detail.
To reiterate, no actual soundness issue was found with our use of `ouroboros`,
but there might be evolutions of `rustc` (or even a future separate compiler)
that could generate unsound code.
[1] https://github.com/joshua-maros/ouroboros/issues/88
author | Raphaël Gomès <rgomes@octobus.net> |
---|---|
date | Mon, 12 Jun 2023 23:41:28 +0200 |
parents | 84eb4c833c41 |
children |
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== New Features == * `hg mv -A` can now be used with `--at-rev`. It behaves just like `hg cp -A --at-rev`, i.e. it marks the destination as a copy of the source whether or not the source still exists (but the source must exist in the parent revision). * New revset predicate `diffcontains(pattern)` for filtering revisions in the same way as `hg grep --diff pattern`. * The memory footprint per changeset and per file during pull/unbundle operations has been significantly reduced. == New Experimental Features == == Bug Fixes == == Backwards Compatibility Changes == == Internal API Changes == * `merge.update()` is now private (renamed to `_update()`). Hopefully the higher-level functions available in the same module cover your use cases. * `phases.registernew` now takes a set of revisions instead of a list of nodes. `phases.advanceboundary` takes an optional set of revisions in addition to the list of nodes. The corresponeding members of the `phasecache` class follow this change. * The `addgroup` member of `revlog` classes no longer keeps a list of all found nodes. It now returns True iff a node was found in the group. An optional callback for duplicated nodes can be used by callers to keep track of all nodes themselve. * The `_chaininfocache` of `revlog` classes has been changed from a dict to a LRU cache.