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I heard that register VMs might be slightly faster than stack VMs, and then it
occurred to me that I wouldn't know how to write a register VM if I tried. So I
wrote one (sort of).
Change-Id: I15309bca88f4b43f6e04957acedc90d9adf16673
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6902
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
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Change-Id: Id99c1d33f87ad9866990d3483d3531e9e48f861f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6916
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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We (might) not want to implement scopedImport in tvix given it's
considered a bit of a misfeature; this makes readTree work with a
`builtins` set that doesn't have it (and if we decide we do want tvix to
have scopedImport, we can revert this pretty easily).
Change-Id: Ia3bbc847514672063a607d977ce167d489fa1131
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6915
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
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This change automatically extends the list of known phases as soon as
they are added to active phase list.
This is great when a user wants to design pipelines with multiple
groups of dynamic steps.
For example in Resoptima we want to design deployment pipeline where
first only staging k8s namespaces are updated/tested and only after,
we update production.
Change-Id: Iab0f2dc3eadda281e483055e26f00a95442e15b9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6923
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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The process of calling a function from a builtin, especially if it's got
more than 1 arrgument, is reasonably involved and easy to get wrong due
to having to interact directly with the stack - instead of having that
done entirely manually in builtins, this wraps it up in a new
`call_with` function which handles pushing arguments onto the stack and
recursively calling the (partially applied) function.
Change-Id: I14700c639a0deca53b9a060f6d70dbc7762e9007
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6910
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Change-Id: Ibc97db4343cb3a1a1677f69fb6c3518c61978aad
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6906
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Change-Id: Iabe28656229f508226b244d81382e517961eb3cf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6901
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Change-Id: I08bfd040a242aa43b64760c19f48a28303f206ac
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6900
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Implement the listToAttrs builtin, which constructs an attribute set
from a list of attribute sets with keys name and value.
This is tested using an adaptation of the nix `eval-ok-listtoattrs.nix`,
with the utilities from `lib.nix` inlined.
Change-Id: Ib5bf743466dda9722c2c1e00797df4b58448cf0f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6894
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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This is generally more idiomatic (over just delegating to Debug), and
also allows us to avoid intermediate allocations if we ever end up
using error messages as part of larger strings (because we don't have to
allocate a full String for the return value).
Change-Id: I67e48b44570c72761ed0fcaded9ae4bf3fcbaacf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6896
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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It uses discrDef internally, but passes `null` as the default tag name,
causing Nix to drop the attribute and return an empty attribute set if
the default case is hit. Consequently we need to check for the empty
attribute set, not `null` to figure out if there was no match found.
We can also test this behavior using `assertThrows` which was introduced
after the tag library was originally written.
Change-Id: I45adb2f9602762dfc867956323fb3f5ae4c8bd1d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6904
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI
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Similar to what we do for import, push on a `default.nix` to the path
that the top-level is invoked with (if any) if it's a directory.
Change-Id: I281bd44e3c8803b6765c886ae5fd08f549e2e563
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6895
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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When contrasting the compilation of the desugared version to the
"sugared" version, this was the noticeable difference.
This fixes b/203.
Change-Id: Iae02ffc56e06de1de091b84cdc59d8fe83a17d69
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6898
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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This requires actually passing the source directory into `interpret` in
the eval tests, but otherwise this is fairly straightforward - if we're
trying to import a directory, just push `default.nix` onto it and import
that instead.
Change-Id: I0b7d4234f81977e78d14dfa651bf0cf9721017e5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6893
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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Factor out the construction of Value::Attrs (including the Rc) into a
new `attrs` constructor function, to abstract away the presence of the
Rc itself.
Change-Id: I42fd4c3841e1db368db999ddd651277ff995f025
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6892
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Thunks correctly force when comparing for equality against other thunks,
but weren't being forced correctly when comparing against non-thunk
values, in either direction.
Change-Id: Ia03702895ec4d70aed3445c1b0a9a7a641d1a300
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6897
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Change-Id: I530c491f60a33fdb97e1553b193de51e7ee57d9a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6873
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Adds secondary spans for errors that occur deeply nested within a
thunk.
This is pretty raw right now, there's technically nothing stopping one
of these error chains from being a hundred thunks deep into code,
producing unmanageable error output. We should trim these down
according to some heuristics (e.g. when crossing file boundaries, o r
just - for starters - beginning and end).
Change-Id: Ia73892512737850b6fa3e07cabc37fa9c534c4d5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6872
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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This change is quite verbose, so a little bit of explaining:
1. To correctly format parse errors, errors must be able to return
more than one annotated span (the parser returns a list of errors
for each span).
To accomplish this, the structure of how the `Diagnostic` struct
which formats an error is constructed has changed to delegate the
creation of the `SpanLabel` vector to the kind of error.
2. The rnix structures don't have human-readable output formats by
default, so some verbose methods for formatting them in
human-readable ways have been added in the errors module. We might
want to move these out into a submodule.
3. In many cases, the errors returned by rnix are a bit strange - so
while we format them with all information that is easily available
they may look weird or not necessarily help users. Consider this CL
only a first step in the right direction.
Change-Id: Ie7dd74751af9e7ecb35d751f8b087aae5ae6e2e8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6871
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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This should save on one function application which can be a big deal for
bigger for_ loops, I suspect. It's not really complicated, so why not.
Change-Id: I2bfcd254e55f1bea366b09de294b2bef9f5b5dda
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6834
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
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This codepath will basically never be used in depot, but I want to add
it as kind of a note to myself. It's kind of a neat feature, although
I'm not quite sure it is going to stick around.
Change-Id: If0e26ef47bdedc6dbf3d048ad4fc9a3a1fd6c5a2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6833
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
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This was written with the same intention (and reuses a little of its
code) as cl/5060 and cl/5063: We want to be able to emit dependencies
between //nix/buildkite pipeline steps, so that no agent is occupied
with waiting on locks for derivations built by a different agent.
This dependency information is already available to the Nix store
implementation (e.g. via `nix-store --query --references`) and can also
be obtained in the Nix language which is important, since the pipeline
is generated at evaluation time. (Note: For Nix 2.3, you either need a
strong convention about how derivations expose their dependencies (which
we don't) or rely on store implementation internals (drv files).
For Nix 2.6 there is a better trick, but it also relies on the existence
of drv files.)
The actual task can be formulated as follows: Given a set of
derivations, calculate the the closest derivations also in the input
each derivation depends on. (We call these (next) known dependencies.)
This is crucial because pipeline step often depend on each other only
indirectly with any number of intermediate derivations. For cl/5064 I
determined that 6 intermediate layers is quite common for dependencies
that are perceived to be “direct”.
This problem is solved as follows:
1. Calculate the dependency graph of the combined dependency closure of
all input derivations. This is quite easy and fairly quick thanks to
the C++ implementation of builtins.genericClosure. One weak point of
the current implementation is that the function to determine the
direct derivation dependencies for Nix < 2.6 is quite hacky.
2. Take the graph from 1. and calculate a dependency graph that only
connects the known derivations of the input, but retains all
connections between them (minus intermediate nodes).
In practice the dependency graph is represented as an attribute set
mapping derivation paths to a list of derivation paths it depends on.
The second step is performed by adding a second list of known derivation
paths it depends on.
The main improvements over the previous concept (cl/5060 and cl/5063):
* We only try to find the closest known dependencies in the dependency
graph whereas we would traverse emit dependencies for the entire
dependency closure.
* We immediately store the calculation of the closest known dependency
in the dependency graph, even for intermediate nodes. This avoids
recalculating the connection (which was a big drawback of the previous
approach) and makes the calculation itself cheaper.
You can run `mg build //nix/dependency-analyzer:example` to build a
visualization of the internal dependencies between `depot.ci.targets` as
discovered by dependency-analyzer.
Change-Id: If8c0cdfc8470d4b337336257d9818aaa0d51110f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6832
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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This is already allowed de facto, since there seems to be a special
exception for reading from derivation outputs. What is forbidden, is
access to files imported to the store (even via builtins.toFile) and
derivation files. The latter is required for doing dependency analysis
on arbitrary derivations, unfortunately.
Access to the store allows kind of evil things, but it should
be (hopefully) hard to do this by accident, and accessing derivation
files is not impure, though it relies on store implementation internals
so to speak.
Change-Id: I33a7de83ef0ee20a7076690329d62f6caffffe5f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6835
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
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This logic was duplicated between the two rnix types before, but more
crucially - it is also needed for correctly displaying the text ranges
contained in syntax errors.
Change-Id: Ifc6a521de1594d6ced9cba6274f1931df99b6634
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6870
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
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This is also useful for error-handling related logic, outside of just
the compiler module.
Change-Id: I5c386e2b4c31cda0a0209b31136ca07f00e39e45
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6869
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
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More notes to me :)
Change-Id: I5264b4234cde67b12610e126ff1d896f6e20457e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6891
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
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More notes to me :)
Change-Id: I27859468249a320a6c307937fd54aa7f1279fd8e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6890
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
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Mostly good, but I'm not sure it works with `git diff --patch`. Not a big deal
though if true.
Change-Id: I268c52dd253f5b0f9dd462a1825206da5dd86dd2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6889
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
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i always seem to get this wrong
Change-Id: Ib6f31523aba1d9f9a32d9af95b96b8d75e0ec16e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6863
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
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Publishing another "note to self"
Change-Id: If5d052f0360f3e1f371b0c1fdd3781e5bb846ea4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6861
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>
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ancient thinkpad experiment 2
Change-Id: Id8a1e9d70642289235dcdac75a07e35c78689d0b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6888
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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This enables the use of string paths (and, in the future,
derivations), as long as their string values represent an absolute
path.
Change-Id: I4b198efeb70415ed52f58bd1da6fa79a24dad14c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6866
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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This lets the VM emit warnings when it encounters situations that
should only be warned about at runtime.
For starters, this is used to pass through compilation warnings that
come up when `import` is used.
Change-Id: I0c4bc8c534d699999887c430d93629fadfa662c4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6868
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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Adding `import` to builtins causes causes a bootstrap cycle because
the `import` builtin needs to be initialised with the set of globals
before being inserted into the globals, which also must contain
itself.
To break out of the cycle this hack wraps the builtins passed to the
compiler in an `Rc` (probably sensible anyways, as they will end up
getting cloned a bunch), containing a RefCell which gives us mutable
access to the builtins.
This opens up a potentially dangerous footgun in which we could mutate
the builtins at runtime leading to different compiler invocations
seeing different builtins, so it'd be nice to have some kind of
"finalised" status for them or some such, but I'm not sure how to
represent that atm.
Change-Id: I25f8d4d2a7e8472d401c8ba2f4bbf9d86ab2abcb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6867
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
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Skip setting bqn-interpreter-path on 32bit – contrary to the
LanguageTool integration, bqn-mode is still useful without the binary
which doesn't compile on i686-linux.
Change-Id: If4493e3e72307ca14984c660f376952cbdcc201c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6887
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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* //3p/overlays: kill electrum override applied upstream
* //corp/tvixbolt,
//users/tazjin/predlozhnik:
update wasm-bindgen to match nixpkgs and run `cargo update`
Change-Id: If4327112832fd0c7938962dd8d3888d4730b7532
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6874
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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Change-Id: Iece11259e3c26ae0b40d16f9ba2c6b8ad5e9995f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6886
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Change-Id: If161fd8b6c96d66aa63cfb22f8a8bb26d71c5caf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6885
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Change-Id: Id90cf6b74999e81680c589847a8b2f64eefc37ca
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6875
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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Given that the laptop I need this for is really slow, I may want to
disable even more stuff, but I'll take it step by step. This should at
least make it possible to build its system closure.
Change-Id: I50c55fa3426252e7f23f419bb2009d58a9312a98
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6876
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
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This adds an initial working version of builtins.import which
encapsulates the entire functionality of `import` within the builtin
itself, without requiring any changes in the compiler or VM.
The key insight that enables this is that we can simply return a Thunk
from `import` that is constructed from the output of running the
compiler and - ta-da! - no other component needs to know about it.
A couple of notes:
* builtins.import needs to capture variables like the SourceCode
structure. This means it can not currently be constructed the same
way as other builtins and has special handling, which leaks out to
`eval.rs`. I have postponed dealing with that until we have this
working a bit more.
* the `globals` are not yet passed through
* the error representation for the new variants is absolutely not done
yet, we probably want to switch to something that supports
cause-chaining now (like miette)
* there is no mechanism for emitting warnings at runtime; we need to
add that
Change-Id: I3117a7ae3ff2432bf44f5ff05ad35f47faca31d5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6857
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
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For some upcoming builtins (notably, import) we need to capture
arguments in the builtin's implementation.
To allow this, we can no longer use function pointers for builtins,
but must use a reference-counted closure object instead.
Unfortunately this adds an extra pointer operation to every builtin
call. We should benchmark this later against having a split builtin
representation.
Change-Id: I109d98d0e25998870542f47573eb1ec2e546f2a2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6856
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
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The text was a little cramped, which made the font hard to read. If
one gives it a little more breathing space, it gets easier to digest.
I couldn’t check the change locally, since `-A web.tvl` doesn’t
reference the static assets (it hardlinks to `static.tvl.su` from what
I can see). I only tested it directly in the browser css editor and
then added the values I found here.
Change-Id: Ic3cb78b2ed0f37e1c55ba70027fec2c62b43a52f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4055
Autosubmit: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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nixpkgs has hardcoded references to Nix versions, we need to provide
it with something that looks like a Nix version while actually being a
Tvix version.
For now, we do this by stealing a trick out of the browser book and
constructing a version that looks like a Nix version to Nix, but like
a Tvix version to people who know what they are looking for.
Nevermind that we don't actually have any kind of versioning for
Tvix (yet?), other than depot revisions.
Change-Id: I7ce8079dd8164a2079891d38e707f09a45f0bbc1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6858
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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* //3p/overlays/tvl: apply more or less questionable compilation fix for
electrum with protobuf >= 4.
Change-Id: Iedbc45cb96b9e5382e304f2cd5ed9fc1c13f7884
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6850
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
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The convention has changed to use `final` instead of `self` and `prev`
instead of `super`. This new convention is much easier to understand
especially for users that are new to Nix and Nixpkgs.
This change is notable in the Nixpkgs project code. I added a note
mentioning that the official documentation hasn't been update with
this information. The documentation is currently undergoing an
overhaul and that is why I believe this hasn't been reflected in the
nixpkgs documentation as of yet.
Imported-From: https://github.com/tazjin/nix-1p/pull/9/commits
Change-Id: I901df69a564969b1784b3d7ac629cfaf85093acb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6859
Reviewed-by: Profpatsch <mail@profpatsch.de>
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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This type hides away the lower-level handling of most codemap data
structures, especially to library consumers (see corresponding changes
in tvixbolt).
This will help with implement `import` by giving us central control
over how the codemap works.
Change-Id: Ifcea36776879725871b30c518aeb96ab5fda035a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6855
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>
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There's basically nothing that needs *ownership* of an AST
node (which is just a little box full of references to other things
anyways), so we can thread this through as references all the way.
Change-Id: I35a1348a50c0e8e07d51dfc18847829379166fbf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6853
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
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There are actually two different types of observers, the ones that
observe the compiler (and emitted chunks from different kinds of
expressions), and the ones that trace runtime execution.
Use of the NoOpObserver is unchanged, it simply implements both
traits.
Change-Id: I4277b82674c259ec55238a0de3bb1cdf5e21a258
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6852
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
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Change-Id: I8d5652d797b012bc3d5248ca2b2d0c87572dbf2e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6851
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>
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