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NixString::iter_plain() didn't make much sense, especially without a docstring.
Rename it to iter_ctx_plain(), and copy the docstring from NixContext.
Do the same for the two other context element types too.
Change-Id: I1bbfcb967d8d9b14487d069bfe3a1f762253ef4d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11882
Tested-by: BuildkiteCI
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Reviewed-by: flokli <flokli@flokli.de>
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Change-Id: Ieb091b32aad566719fbe8604c4a589f5ccaaf6b3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11877
Tested-by: BuildkiteCI
Reviewed-by: Connor Brewster <cbrewster@hey.com>
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There's other places where unexpected arguments can be provided, like
in builtins.
Make space for that error type.
Change-Id: Ic831497a3a1dd36a3a184bedadcf1374bf0ae6db
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11876
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI
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This allows peeking of the type at a given path.
It's necessary, as an open() might not fail until you try to read()
from it, and generally, stat'ing can be faster in some cases.
Change-Id: Ib002da3194a3546ca286de49aac8d1022ec5560f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11871
Tested-by: BuildkiteCI
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Reviewed-by: Connor Brewster <cbrewster@hey.com>
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The builtins `placeholder` and `filterSource` are now implemented in
tvix-glue and so we no longer need their placeholder "implementations" in
tvix-eval.
Change-Id: Ibf161ccf1ad40103e9fbb688e9f6be58e7772af1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11867
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: Ilan Joselevich <personal@ilanjoselevich.com>
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Change-Id: I75b33c43456389de6e521b4f0ad46d68bc9e98f6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11809
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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This prevents the following statements from looping endlessly:
```
builtins.split "(.*)" ""
builtins.split "([abc]*)" "abc"
builtins.split "(.*)" "abc"
builtins.split ".*" ""
```
Cover these (and some more examples) in the test suite.
Co-Authored-By: Florian Klink <flokli@flokli.de>
Change-Id: Ibd339f971e0f4e3e5c229816e2be5a8e3836fec9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11743
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Fix some typos found while reading various documents, mostly those
relating to the castore.
Here is a summary of the edits.
- fix broken link between documents in the store and castore directories
- clarify expression in castore's data model document that indicates
that the *name* of each child node of a directory must be unique
across all three lists of children
- add missing closing parenthesis in castore's data model document
- replace "how" with "what" in the phrase "unclear how a ... would even
look like" in castore's why-not-git-trees document
- remove unnecessary articles in castore's blobstore chunking document
- add missing "y" to "optionall" in eval's compilation of bindings
document
Change-Id: I1997ea91bb4e9c40abcd81e0cde9405968580ba6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11763
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Switch tvix to using jemalloc as the default global allocator on
supported (eg, non-msvc) platforms. This gives a pretty reasonable
performance boost basically for free:
int time: [24.361 µs 24.386 µs 24.418 µs]
change: [-19.355% -18.859% -18.527%] (p = 0.00 < 0.05)
Performance has improved.
merge small attrs time: [37.201 µs 37.328 µs 37.442 µs]
change: [-24.609% -24.266% -23.982%] (p = 0.00 < 0.05)
Performance has improved.
merge large attrs with small attrs
time: [20.030 ms 20.135 ms 20.251 ms]
change: [-4.2811% -3.2549% -2.3807%] (p = 0.00 < 0.05)
Performance has improved.
hello outpath time: [967.91 ms 974.07 ms 983.33 ms]
change: [-5.5008% -4.4552% -3.4099%] (p = 0.00 < 0.05)
Performance has improved.
Change-Id: I6c6e6e3295ec2fca01ea28dc37bcb201cd811767
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10851
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: flokli <flokli@flokli.de>
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Context: https://github.com/la10736/rstest/issues/256
Cargo will now cause a rebuild whenever a new test case file is added.
Previsouly running `cargo test` after adding a new test case resulted in
that case not being picked up and ignored.
Change-Id: Ibfc420b5bfe3f3ee41d3ebd3fb9d248819fa6ed9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11751
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: Ilan Joselevich <personal@ilanjoselevich.com>
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This one's relatively simple - we just check if the store path exists,
and if it does we make a new contextful string containing the store path
as its only context element.
Automatic testing seems tricky for this (I think?) so I tested it
manually:
tvix-repl> builtins.storePath /nix/store/yn46i4xx5alh7gs6fpkxk430i34rp2q9-hello-2.12.1
=> "/nix/store/yn46i4xx5alh7gs6fpkxk430i34rp2q9-hello-2.12.1" :: string
Change-Id: I8a0d9726e4102ab872c53c2419679c2c855a5a18
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11696
Tested-by: BuildkiteCI
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: flokli <flokli@flokli.de>
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Closes: https://b.tvl.fyi/issues/401
With this change all crate features (and their combinations) will be built and
tested in CI.
From now on, when adding/removing a Cargo feature for a crate,
you will want to add it to the features power set that gets tested in CI.
For each crate there's a default.nix with a `mkFeaturePowerset` invocation,
modify the list to include/remove the feature.
Note that you don't want to add "collection" features,
such as `fs` for tvix-[ca]store or `default`.
Change-Id: I966dde1413d057770787da3296cce9c1924570e0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11717
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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This fixes the following command:
'cargo test --no-default-features --features nix_tests'
Change-Id: I9883c39e1e428c72a0e7e0b75a73c8ed734abd3b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11740
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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`cargo test --no-default-features` fails, if we don't conditionalize
this on the `arbitrary` feature too.
Change-Id: I81a277810119fed0cfc37c942c422f731aa14b2e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11726
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: Connor Brewster <cbrewster@hey.com>
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`Evaluation::new_impure()` would require the test to be impure, but
there's nothing in this test specifically requiring us to make use of
impure features.
Change-Id: Idb24981195d1a94f51053ae04403eb5f0e27f3d9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11725
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: Connor Brewster <cbrewster@hey.com>
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This uses StdIO, which is only available when the `impure` feature is
enabled.
Change-Id: I039b1f45f6619dd099fa943e58322ff521482dfa
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11724
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Connor Brewster <cbrewster@hey.com>
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Gate this behind the nix_tests feature flag (which wasn't applied
consistently).
Also, at least right now all of these use StdIO internally, either by
creating it on their own, or through the `eval_test` helper.
Once we have some proper classification system for tests we can probably
split this up further, but for now only run them if the impure feature
is enabled.
Change-Id: I3236cf09b3391585df99073367c4e4832c5e7898
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11723
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Connor Brewster <cbrewster@hey.com>
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These VM requests are only emitted by code gated behind the impure feature.
To prevent warning from popping up when building without default
features, allow these to be unused if `impure` is not enabled.
Change-Id: Id871a5215e9a0f09aa78edecdd111369ee7ffe34
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11722
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
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These use StdIO, which is only available if the impure feature is
enabled.
Change-Id: I18d8e191a7eba6ba5bd59f43631973eaa796c7bb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11721
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: tazjin <tazjin@tvl.su>
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These are only needed when building with the impure feature enabled.
This removes some warnings when building with --no-default-features.
Change-Id: I3139d9133d4846aeb1b1b5f3830c0d078d047292
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11720
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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cl/11712 simultaneously introduced this check and made it unnecessary,
since NixString::context should never return `Some` for empty contexts
now.
Change-Id: I41a655ff33910e8326cbb7d7526eb91bd19e9585
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11713
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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Both `Some(NixContext::new())` and `None` represent empty contexts,
but the former trips up `NixString::has_context`, and seems likely
to trip up other things.
We could hide the difference in the accessors, but we don't really
*want* the distinction to exist, since heap-allocating a null value
is pretty much always a mistake.
Change-Id: Ie84d26fb0d4b59e68354891ba13bde3bae40ab6e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11712
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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In places where we want to extend context with that from another
NixString, use take_context() to split it off, then call .extend(),
making use of IntoIterator to avoid a bunch of clones.
Change-Id: I2460141a3ed776c64c36132b2203b6a1d710b922
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11705
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: edef <edef@edef.eu>
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XmlEmitter gains a NixContext field, and `write_typed_value` extends it
with all context elements present in the passed value.
Once all serialization is done, a into_context() function returns the
collected context, so we can construct a NixString with context.
Tests for this live in tvix-glue, as we use builtins.derivation, which
is not present in the tvix-eval crate.
Fixes b/398.
Change-Id: I85feaaa17b753885f8a017a54e419ec4e602af21
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11704
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Alyssa Ross <hi@alyssa.is>
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This is a slightly less annoying version of `join`, which does not
consume self. It's more consistent with HashSet::extend().
Change-Id: Ifd0872da36fe8e7b2aa6948674cb8e4023abe9d7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11703
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: edef <edef@edef.eu>
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This is not necessarily valid UTF-8.
Change-Id: I72f3157240772eb9c558e5699b4785e44d256fd4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11702
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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In order to be compatible with the nix XML generator, it’s easier to
generate the XML directly, instead of going through a library which we
have to bend to do what we need.
Removes dependency on `xml-rs`, which came with a full XML parser that
we didn’t use. Only takes a tiny bit of code for the XML escaping,
somewhat simplified.
I add a little escaping value, to make sure we have the same behaviour
as nix proper.
Interestingly enough, we never need to escape XML attribute names,
because the `builtins.toXML` format encodes user-defined values as
attribute keys only. So we only escape attribute values.
Fixes: https://b.tvl.fyi/issues/399
Change-Id: If4d407d324864b3bb9aa3160e2ec6889f7727127
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11697
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: Profpatsch <mail@profpatsch.de>
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Have this return the same values as builtins.unsafeGetAttrsPos, rather
than returning a CatchableErrorKind, which crashes the CLI if it bubbles
up.
The environment we're in doesn't allow emitting a warning, as we don't
have `co` in scope, but that's probably OK as a stopgap solution.
Alternative to cl/11665.
Change-Id: I5b2c2530842547c93b6533ed9601ee9b2923b1bf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11685
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Change-Id: I216be1b75eb9f18a58ab2164a77b3c51de8bf784
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11583
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: Adam Joseph <adam@westernsemico.com>
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Prior to this, some tests would not build
or would fail in an obscure way.
Change-Id: I68587cc7592492ebfd71ca02fc7ccc9ff7c0196f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11544
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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- //tvix: address new clippy lints
- //users/tazjin: Satisfy gonic module's new need for a playlist folder.
- //users/aspen/games: adjust for changed location of df's default
init.txt and d_init.txt.
Change-Id: I00a2adb506ae866206fb6f88c39c9a6af320380f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11509
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: aspen <root@gws.fyi>
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This caught me by accident in an earlier revision of cl/11500 -
I had a `NixString`, wanted to return it as a `String`, so I was naively
calling `s.into()`.
That unfortunately gave me the `Display` implementation of `NixString`,
which quotes strings, causing an annoying error further up the stack.
NixStrings are bytes, we can keep the impl From<NixString> for BString,
but having a `.into()` suddenly do quoting is more than unexpected.
Change-Id: I5434ba94bfe6c493d0a57e68225ecc22daa4b948
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11505
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
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It was returning `{ line, col, file }` instead of `{ line, column, file
}`.
Note this is not a regression in Nix, Nix always had `column` since
2013.
Change-Id: I4871a201b32324dff0432526d0449806a535828f
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11409
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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`toJSON` transform a Nix structure into a JSON string.
For each context in that Nix structure, the JSON string must possess it.
Thus, it is necessary to take the union of all contexts and attach it to
the final structure.
Unfortunately, the return type of `into_json` is a serde's JSON object,
not a string. Therefore, it is not possible to reuse `NixString`
machinery.
Context tests are reinforced as Nix does not test those behaviors.
Fixes b/393.
Change-Id: I5afdbc4e18dd70469192c1aa657d1049ba330149
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11266
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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We don't have it in all Cargo.toml files either.
Change-Id: Ifcb333a39603a7e402ab0068e0f0f1b5af769e13
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11388
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Reviewed-by: Brian Olsen <me@griff.name>
Autosubmit: flokli <flokli@flokli.de>
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Change-Id: Ib2f5e84fdb8be1210b3507da67d4fe84f061651e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11387
Tested-by: BuildkiteCI
Reviewed-by: Brian Olsen <me@griff.name>
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
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Right now `builtins.hashFile` always reads the entire file into memory
before hashing, which is not ideal for large files. This replaces
`read_to_string` with `open_file` which allows calculating the hash of
the file without buffering it entirely into memory. Other callers can
continue to buffer into memory if they choose, but they still use the
`open_file` VM request and then call `read_to_string` or `read_to_end`
on the `std::io::Reader`.
Fixes b/380
Change-Id: Ifa1c8324bcee8f751604b0b449feab875c632fda
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11236
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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`appendContext s ctx` will just append a user-crafted context attrs to `s`.
The most important part of this builtin is to perform all the relevant invariant validations
to avoid letting the user craft invalid contexts which can never be built, e.g. invalid store paths,
inexistent derivations, etc.
This version is incomplete and full of TODOs, but passes all the Nix's
context strings tests, so we turn them on.
Change-Id: I625dc5e7c4f5b784f078b390f04b0ee5a8d65a7c
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11263
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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This builtin only transforms any `NixContextElement::Derivation` into the trivial `NixContextElement::Plain`.
This is a forgetful functor on derivation-deep context strings.
The test coverage of this change is done in cl/11264.
Change-Id: Icd00778c97766be6db8a6bdabaa59e9724353ec5
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11262
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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Nixpkgs make use of it and this is a 2.3 builtin that was missed.
Change-Id: If36d748eed4a5f777344556c0802392c76c8d53c
Signed-off-by: Ryan Lahfa <tvl@lahfa.xyz>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11260
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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The accompanying test case shows that we need to bubble up the catchable
error from the equality check if one is created.
Change-Id: Ic9929a57aa7653c8aa5a72d1711cf3264798c731
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11159
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
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It is pretty pointless to force the function argument if we are going to
use a suspended call later since forcing the function may fail in ways
that are not covered by Catchables (non-recoverable errors, infinite
recursions). From this, it kind of seems as if using #[catch] is never
correct and should be replaced by #[lazy]. Also we should probably try
to come up with more test cases for stuff where laziness gets us out of
the jam as an equivalent to the catchable tests for nonrecoverable
errors.
Fixes b/386.
Change-Id: Ia926df4ac1b440ec430403ab7b40924a0c97221b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11153
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
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Change-Id: Ia1058a5ea687f413fbb62365da199032bdbd3fd2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11155
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
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Change-Id: Ife599387d0472cd746b992bd6755a2fb6a0e0dc4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11158
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI
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When we added the Nix language test suite in cl/6126, we excluded the
whole tvix tests folder from Nix formatting. This is unintentional, as
we probably want *our* tests to be formatted correctly.
Change-Id: I2b66d79e30fae17e75d5a1f8c44e279886091c5f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11154
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
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Change-Id: Icf74c699130c2ab774973a7e98bc44ffba8c5ec2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11139
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: flokli <flokli@flokli.de>
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The primary addition is the `builtin_hashFile` function which attempts
value-path coercion and on success reads the file to a nix_string.
Similar to the `builtins_hashString` implementation, the hash is then
derived using the `hash_nix_string` function in the introduced hash
module which has extracted hashing functionality initially specified in
cl/11005.
Change-Id: I5e3ef0317223af99488ebb79efc2fb49b4cbc1b6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11007
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
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Use bolt.tvix.dev everywhere.
Change-Id: Ifebbea60058418c12cde20a2a3879a8a7f5f830c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11022
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Implements md5, sha1, sha256 and sha512 using the related crates from
the RustCrypto hashes project (https://github.com/RustCrypto/hashes)
Change-Id: I00730dea44ec9ef85309edc27addab0ae88814b8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11005
Tested-by: BuildkiteCI
Reviewed-by: aspen <root@gws.fyi>
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Previously, Nix strings were represented as a Box (within Value)
pointing to a tuple of an optional context, and another Box pointing to
the actual string allocation itself. This is pretty inefficient, both in
terms of memory usage (we use 48 whole bytes for a None context!) and in
terms of the extra indirection required to get at the actual data. It
was necessary, however, because with native Rust DSTs if we had
something like `struct NixString(Option<NixContext>, BStr)` we could
only pass around *fat* pointers to that value (with the length in the
pointer) and that'd make Value need to be bigger (which is a waste of
both memory and cache space, since that memory would be unused for all
other Values).
Instead, this commit implements *manual* allocation of a packed string
representation, with the length *in the allocation* as a field past the
context. This requires a big old pile of unsafe Rust, but the payoff is
clear:
hello outpath time: [882.18 ms 897.16 ms 911.23 ms]
change: [-15.143% -13.819% -12.500%] (p = 0.00 < 0.05)
Performance has improved.
Fortunately this change can be localized entirely within
value/string.rs, since we were abstracting things out nicely.
Change-Id: Ibf56dd16c9c503884f64facbb7f0ac596463efb6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10852
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Autosubmit: aspen <root@gws.fyi>
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