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This reverts parts of the CLs splitting the backing implementation for
Bindings and moves back to only the BTreeMap-backed implementation.
Our evaluation has indicated that the Vector-backed implementation
does not match the performance of the plain array used upstream, and
in my view the complexity introduced by it is not worth the relatively
small (single-digit percentage) performance increase with a
pivot-point close to the number of attributes yielded by
stdenv.mkDerivation.
Going forward we will trial implementations of attribute sets backed
by HAMTs, and investigate other mechanisms of speeding up the language.
Some changes from the previous CLs are retained, for example the
removal of insert_or_assign and the passing of capacity.
Change-Id: I6eb4b075b453949583360755055c21a29d7ff642
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1172
Reviewed-by: glittershark <grfn@gws.fyi>
Tested-by: BuildkiteCI
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Having a colon in the path may cause issues, and having the hash
function indicated isn't actually necessary. We now verify the path
format in the tests to prevent regressions.
(cherry picked from commit c65a6fa86aef7bdf51fb4fba7bd31d265619ba3f)
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Previously all includes were anchored in one global mess of header
files. This moves the includes into filesystem "namespaces" (if you
will) for each sub-package of Nix.
Note: This commit does not introduce the relevant build system changes.
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This feature does not appear in nixpkgs, so I don't care about it. My
only goal is evaluating nixpkgs.
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There are still remnants of the old build system (for example, the
build derivations are not yet updated at all), but we'll get there.
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Reformatted with:
fd . -e hh -e cc | xargs clang-format -i
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(cherry picked from commit 086a81b7a5bbe1fc022efb5935ff68f6ad71ddaf)
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git-subtree-dir: third_party/nix
git-subtree-mainline: cf8cd640c1adf74a3706efbcb0ea4625da106fb2
git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10
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