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Only libexpr depends on the garbage collector, specifically only
instantiations of EvalState actually require the GC to be initialised.
Rather than always starting it for the whole program, even if it is
not needed, this change moves the GC initialisation into libexpr,
guarded by absl::call_once.
This should make it possible to run the nix daemon without the garbage
collector interfering, granted that things are correcty separated and
the daemon does not actually invoke the evaluator.
Based on my investigation so far, the daemon logic itself does not
require libexpr to be present at all - so I think it is safe - but the
current monobinary might have some tricks up its sleeve that will
cause problems for us. We can deal with those if they arise.
Relates to https://b.tvl.fyi/issues/30
Change-Id: I61c745f96420c02e089bd3c362ac3ccb117d3073
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1584
Tested-by: BuildkiteCI
Reviewed-by: edef <edef@edef.eu>
Reviewed-by: kanepyork <rikingcoding@gmail.com>
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This reverts commit ef54f5da9fa30b5c302f2a49595ee5d041f9706a.
Resolved conflicts:
third_party/nix/src/libexpr/eval.cc
third_party/nix/src/libstore/builtins/fetchurl.cc
third_party/nix/src/libstore/references.cc
third_party/nix/src/libutil/hash.cc
third_party/nix/src/nix-daemon/nix-daemon.cc
Change-Id: Ib9cf6e96a79a23bde3983579ced3f92e530cb011
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1547
Reviewed-by: glittershark <grfn@gws.fyi>
Tested-by: BuildkiteCI
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Change-Id: I2f6bef7b090d44f50bd27fbd19b50f9cf100b238
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1506
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: tazjin <mail@tazj.in>
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External values are only useful when using the plugin framework, which we are not interested in carrying forward.
Reverts commit 320659b0cd161249c95e736c3fb309b1a73ea728
Change-Id: Ib4929c349bbb33f16224fc674e94c7b7d5953c6a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1505
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: tazjin <mail@tazj.in>
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This eliminates the value-smuggling that would trip up the GC.
Change-Id: I8057df78cf0bf6bea9faf1b44233aa9820ae44f5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1504
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: tazjin <mail@tazj.in>
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Add two more garbage-collection flags. Annotate how terrible tExternal is. Prepare to fix the smuggle casting in ExprWith. Add a static_cast.
Change-Id: I20f980abc8cb192e094f539185900a6df5457c29
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1503
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: tazjin <mail@tazj.in>
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Change-Id: I265e763393422ee1881653527c91024458060825
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1432
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
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This compiles under `-Wall -Werror`.
The largest chunk of this change is `final` qualifiers for the various
Nix CLI command structs, which inherit from a Command class that has
more virtual functions than are implemented by each command.
Change-Id: I0925e6e1a39013f026773db5816e4a77d50f3b4a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1294
Tested-by: BuildkiteCI
Reviewed-by: isomer <isomer@tvl.fyi>
Reviewed-by: kanepyork <rikingcoding@gmail.com>
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The function is renamed to `SortedByKeys`, which is more descriptive,
and annotated with a comment about what it is used for.
The deprecation warning has been removed because this function is
currently functionally required.
Change-Id: I0ee3a76deff05f366feca9ddac8f38ab34bffbd0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1288
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
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This change does away with the previous special-casing of lists of
certain element sizes, and the use of raw C-style arrays.
Lists are now backed by a std::vector of nix::Value*, which uses the
traceable GC allocator.
This change is unfortunately quite noisy because the accessor methods
were updated/removed accordingly, so all callsites of Nix-related
lists have changed.
For some operations in primops.cc where keeping the previous code
structure would have been more difficult with a "proper" vector, the
implementation has been replaced with std::vector methods. For
example, list concatenation now uses appropriate range inserts.
Anecdotally the performance of this is about equal, to even slightly
better, than the previous implementation.
All language tests pass and the depot paths I've used for testing
still evaluate.
Change-Id: Ib5eca6c0207429cb323a330c838c3a2200b2c693
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1266
Tested-by: BuildkiteCI
Reviewed-by: isomer <isomer@tvl.fyi>
Reviewed-by: Kane York <rikingcoding@gmail.com>
Reviewed-by: glittershark <grfn@gws.fyi>
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This has several advantages:
* we can ensure that the vector is traced by the GC
* we don't need to unsafely allocate memory to make an Env
Note that there was previously a check about the size of the
environment, but it's unclear why this was the case (git history
yielded nothing interesting) and it seems to have no effect.
Change-Id: I4998b879a728a6fb68e1bd187c521e2304e5047e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1265
Tested-by: BuildkiteCI
Reviewed-by: isomer <isomer@tvl.fyi>
Reviewed-by: Kane York <rikingcoding@gmail.com>
Reviewed-by: glittershark <grfn@gws.fyi>
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Backported from:
https://github.com/NixOS/nix/commit/b3e5eea4a91400fb2a12aba4b07a94d03ba54605
https://github.com/NixOS/nix/commit/fcd048a526bd239fa615457e77d61d69d679bf03
Intentionally skipped because we have not backported the JSON changes:
https://github.com/NixOS/nix/commit/9f46f54de4e55267df492456fc0393f74616366b
Did not apply changes ni primops.cc, because those look suspect and
are also based on something that we don't have in our tree.
Change-Id: I837787ce9f2c90267bc39fce15177980d209d4e9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1253
Tested-by: BuildkiteCI
Reviewed-by: isomer <isomer@tvl.fyi>
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Instead of manually iterating over the two bindings to be combined,
this adds a new static method on the Bindings class which merges two
attribute sets by calling the range insertion operator over them.
In some anecdotal tests, this can lead to a ~10% speed bump -
depending on the specific operation.
Change-Id: I5dea03b0589a83a789d3a8a0fc81d0d9e6598371
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1216
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
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Paired-With: Perry Lorier <isomer@tvl.fyi>
Change-Id: I418e9127c5d9d31559c59e461f17726ddbc051c4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1180
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>
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To aid in making the decision of where to (currently just statically)
use a vector or btree as the backing implementation, add an extra
constructor argument to Bindings::NewGC for a capacity, and use
a (currently hardcoded at 32, for no good reason other than it felt like
a reasonable number) pivot to switch between our possible backing
implementations. Then, update all the call sites where it feels
reasonable that we know the capacity statically to *pass* that capacity
to the constructor.
Paired-With: Luke Granger-Brown <git@lukegb.com>
Paired-With: Vincent Ambo <mail@tazj.in>
Paired-With: Perry Lorier <isomer@tvl.fyi>
Change-Id: I1858c161301a1cd0e83aeeb9a58839378869e71d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1124
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: isomer <isomer@tvl.fyi>
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Change-Id: I1cfbb7e933da54198115b28ac509b0d04870fd8f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1127
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: glittershark <grfn@gws.fyi>
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Having a default constructor for this causes a variety of annoying
situations across the codebase in which this is initialised to an
unexpected value, leading to constant guarding against those
conditions.
It turns out there's actually no intrinsic reason that this default
constructor needs to exist. The biggest one was addressed in CL/1138
and this commit cleans up the remaining bits.
Change-Id: I4a847f50bc90e72f028598196592a7d8730a4e01
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1139
Reviewed-by: isomer <isomer@tvl.fyi>
Tested-by: BuildkiteCI
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nix:AttrName was one of the few classes that relied on the default
constructor of nix::Symbol (which I am trying to remove in a separate
change).
The class essentially represents the name of an attribute in a set,
which is either just a string expression or a dynamically evaluated
expression (e.g. string interpolation).
Previously it would be constructed by only setting one of the fields
and defaulting the other, now it is an explicit std::variant.
Note that there are several code paths where not all eventualities are
handled and this code is bug-for-bug compatible with those, except
that unknown conditions (which should never work) are now throwing
instead of silently doing ... something.
The language tests pass with this change, and the depot derivations
that I tested with evaluated successfully.
Change-Id: Icf1ee60a5f8308f4ab18a82749e00cf37a938a8f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1138
Reviewed-by: edef <edef@edef.eu>
Reviewed-by: glittershark <grfn@gws.fyi>
Tested-by: BuildkiteCI
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These bits are no longer required with the hashmap-backed
implementation of attribute sets.
Change-Id: I8b936d8d438a00bad4ccf8e0b4dd719c559ce8c2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/912
Tested-by: BuildkiteCI
Reviewed-by: edef <edef@edef.eu>
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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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Uses the equivalent absl::StartsWith and absl::EndsWith functions
instead.
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It is considered bad form to use things from includes in headers, as
these directives propagate to everywhere else and can make it
confusing.
types.hh (which is includes almost literally everywhere) had some of
these directives, which this commit removes.
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... this fixes nixpkgs eval!
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These were things that took me a moment to realise.
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In the change to the backing structure of attribute sets, the
requirement to manually balance the capacity of the structure went
away.
This is a) because Abseil's data structures manage this on their own,
and b) because the new Bindings class is allocated using `new (GC)`
rather than writing into a predefined memory area.
As part of this change functions related to the capacity were
deprecated and set to 0 values, which in turn caused the creation of
new attribute sets to return the same (mutable!) default value in
various cases, leading to "side effects" that caused evaluation
failures.
FWIW, I'm not sure if this optimisation had noticeable performance
impact, but while untangling libexpr it definitely doesn't help trying
to follow what it's doing - so bye, bye!
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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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EvalState::allocBindings had little to do with Bindings, other than
returning them, and didn't belong in that class.
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This function does nothing anymore since the attributes are always
in-order.
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The new attribute set API uses the iterators of the btree_map
directly. This requires changes in various files because the internals
of libexpr are very entangled.
This code runs and compiles, but there is a bug causing empty
attribute sets to be assigned incorrectly.
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Instead of doing some sort of inline merge-sort of the two attribute
sets, use the attribute sets merge function.
This commit alone does not build and is not supposed to.
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This is the first step towards replacing the implementation of
attribute sets with an absl::btree_map.
Currently many access are done using array offsets and pointer
arithmetic, so this change is currently causing Nix to fail in various
ways.
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Replaces most uses of `string` with `std::string`.
This came up because I removed the "types.hh" import from
"symbol-table.hh", which percolated through a bunch of files where
`string` was suddenly no longer defined ... *sigh*
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The functions in SymbolTable have been renamed to match the Google
Style guide, and some debug-only functions have been removed.
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This applies the performance fixes listed here:
https://clang.llvm.org/extra/clang-tidy/checks/list.html
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This applies the readability fixes listed here:
https://clang.llvm.org/extra/clang-tidy/checks/list.html
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This applies the modernization fixes listed here:
https://clang.llvm.org/extra/clang-tidy/checks/list.html
The 'modernize-use-trailing-return-type' fix was excluded due to my
personal preference (more specifically, I think the 'auto' keyword is
misleading in that position).
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This last change set was generated by a full clang-tidy run (including
compilation):
clang-tidy -p ~/projects/nix-build/ \
-checks=-*,readability-braces-around-statements -fix src/*/*.cc
Actually running clang-tidy requires some massaging to make it play
nice with Nix + meson, I'll be adding a wrapper or something for that soon.
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These were not caught by the previous clang-tidy invocation, but were
instead sorted out using amber[0] as such:
ambr --regex 'for (\(.+\))\s([a-z].*;)' 'for $1 { $2 }'
[0]: https://github.com/dalance/amber
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These were not caught by the previous clang-tidy invocation, but were
instead sorted out using amber[0] as such:
ambr --regex 'if (\(.+\))\s([a-z].*;)' 'if $1 { $2 }'
[0]: https://github.com/dalance/amber
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Fixes mistakes introduced by clang-tidy in the previous commit.
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This change was generated with:
fd -e cc -e hh | xargs -I{} clang-tidy {} -p ~/projects/nix-build/ \
--checks='-*,readability-braces-around-statements' --fix \
-fix-errors
Some manual fixes were applied because some convoluted unbraced
statements couldn't be untangled by clang-tidy.
This commit still includes invalid files, but I decided to clean them
up in a subsequent commit so that it becomes more obvious where
clang-tidy failed. Maybe this will allow for a bug-report to
clang-tidy.
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Reformatted with:
fd . -e hh -e cc | xargs clang-format -i
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git-subtree-dir: third_party/nix
git-subtree-mainline: cf8cd640c1adf74a3706efbcb0ea4625da106fb2
git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10
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