The backtrace-on-stack-overflow create provides best-effort stack
traces when a stack overflow happens. Since it's running on the
(usually tiny) signal alternate stack this isn't easy.
This is guarded by a new `backtrace_overflow` feature flag and never
enabled (even if that feature is selected) for release builds. This
is strictly for debugging; there's crazy unsafe voodoo in there.
https://lib.rs/crates/backtrace-on-stack-overflow
Example output:
```
Stack Overflow:
0: backtrace_on_stack_overflow::handle_sigsegv
at /home/amjoseph/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-on-stack-overflow-0.2.0/src/lib.rs:93:40
1: <unknown>
2: __rust_probestack
3: tvix_eval::vm::VM::run_op
at src/vm.rs:399
4: tvix_eval::vm::VM::run
at src/vm.rs:388:23
5: tvix_eval::vm::VM::enter_frame
at src/vm.rs:360:22
6: tvix_eval::value::thunk::Thunk::force
at src/value/thunk.rs:116:25
7: tvix_eval::vm::VM::run_op
at src/vm.rs:801:37
8: tvix_eval::vm::VM::run
at src/vm.rs:388:23
9: tvix_eval::vm::VM::enter_frame
at src/vm.rs:360:22
10: tvix_eval::value::thunk::Thunk::force
at src/value/thunk.rs:116:25
...
```
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I1d8a2017f836be7bf91a2223e7adacb86fa1dbb2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7354
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Add a single new proc macro to a new proc-macro crate,
`tvix-eval-proc-macros` for defining an inline module containing nix
builtins, and automatically generating a function within that module
which returns a list of those builtins as `tvix_eval::value::Builtin`.
Change-Id: Ie4afae438914d2af93d15637151a49b4c68aa352
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7198
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: Adam Joseph <adam@westernsemico.com>
Tested-by: BuildkiteCI
This implements serde::Serialize for the rnix AST through a wrapper
type, and exposes a function for serialising the AST into
a (pretty-printed JSON) string representation.
This can be used to debug issues with the AST, and to display an AST
reprsentation in tools like tvixbolt.
Serialize is implemented manually because we don't own any of the
structs and the way to traverse them is not easily derived
automatically, and this is quite verbose. We might be able to condense
it a little bit, but at the same time it's also fairly straightforward.
Change-Id: I922df43cfc25636f3c8baee7944c75ade516055c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6943
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: Adam Joseph <adam@westernsemico.com>
Reviewed-by: tazjin <tazjin@tvl.su>
Implement an *initial* version of builtins.match, using the rust `regex`
crate for regular expressions. The rust regex crate definitely has
different semantics than nix's regular expressions - but we'd like to
see how far we can get before the incompatibility starts to matter.
This consciously leaves out any sort of memo for compiled regular
expressions (which upstream nix also has) for the sake of expediency -
in the future we should implement that so we don't have to compile the
same regular expression multiple times.
Change-Id: I5b718635831ec83397940e417a9047c4342b6fa1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6989
Tested-by: BuildkiteCI
Reviewed-by: Adam Joseph <adam@westernsemico.com>
Reviewed-by: tazjin <tazjin@tvl.su>
Using `serde_json` for parsing JSON here, plus an `impl FromJSON for
Value`. The latter is primarily to stay "dependency light" for now -
likely going with an actual serde `Deserialize` impl in the future is
going to be way better as it allows saving significantly on intermediary
allocations.
Change-Id: I152a0448ff7c87cf7ebaac927c38912b99de1c18
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6920
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
This updates rnix-parser to a version where inherits provide an
iterator over `ast::Attr` instead of `ast::Ident`, which mirrors the
behaviour of Nix (inherits can have (statically known) strings as
their identifiers).
This actually required some fairly significant code reshuffling in the
compiler, as there was an implicit assumption in many places that we
would have an `ast::Ident` node available when dealing with variable
access (which is then explicitly only not true in this case).
Change-Id: I12f1e786c0030c85107b1aa409bd49adb5465546
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6747
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Refactor the environment variable and argument parsing for the tvix repl
to use Clap instead of doing things ad-hoc, and thread through options
obtained from environment variables via explicit arguments rather than
obtaining them from the environment as they're needed. This makes adding
more flags more sustainable, and also makes the binary fully
self-documenting, including supported env vars, via `--help`.
Change-Id: Ib1f6a0cd20056e8c9196760ff755fa5729667760
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6653
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
This bumps rnix-parser to a commit that should be unaffected by the
Nix >= 2.4 bug that prevents it from cloning repositories with filters.
Change-Id: Ie01da95245ec6740fa889eb710819e512202f665
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6634
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
It's proptest time!
Add deps on the proptest and test_strategy crates, gated behind a
new (default-enabled) "arbitrary" feature flag so that they don't affect
dependencies of things like tvixbolt that depend on tvix.
These are going in dependencies, not dev-dependencies, so that we can
impl Arbitrary for stuff outside of test modules (which will be
important for integration suites which want to run proptests)
Change-Id: I1613bd3ea9a835e22986ad4e59700e8736007963
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6624
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Add the start of a test suite that compares tvix eval results against
nix, using the string repr of the value as the comparison. This shells
out to a nix-instantiate binary, which is configurable as an environment
variable, to eval - there's some extra machinery there to setup a new
nix store as a tempdir to allow running this test inside the nix build
for tvix-eval itself.
Currently this has a macro that'll allow writing lots and lots of
hardcoded tests, but going forward I'm also going to be looking into
adding proptest-based generation of expressions to compare.
Change-Id: I9f4895fab1e668ed2b7dfd6f92f8c80de1bbb16b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6307
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
This is a crate for source-span based error reporting. Since all of
our spans are already codemap spans, it is a good starting point.
We have to figure out quite a bit of logic for neat error printing;
later on if we want fancier presentation we might want to look at one
of the other libraries in this space like miette.
Change-Id: I4e28886af1ed199b7112d9dbf063c9f29b612bf1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6531
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: grfn <grfn@gws.fyi>
Updated the rnix hash manually, and ran `cargo update` for the rest.
Change-Id: I457262625d648e25d745efa4d33ae44cb8f21326
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6375
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
This will be used to track source spans when emitting bytecode.
The codemap is a data structure which tracks *all* the source files
visited by an evaluation, and makes it possible to represent locations
across all of the files using a simple span (i.e. pair of offsets).
When reporting errors, this even contains enough information to
reconstruct the rnix AST to create fancier reporting in certain cases
if desired.
Change-Id: I4ae98620b9b150fb5a389bd7f1e12670e3192c62
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6374
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Add a quick couple of benchmarks for merging attribute sets, large and
small.
Change-Id: I26940a9cf4e0d30e3d9eb07a7b8c366ca4072ca3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6286
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: grfn <grfn@gws.fyi>
In this commit, the string interpolation parsing is identical to
nixpkgs which makes some of the upstream Nix tests for
interpolation-related weirdness pass.
Change-Id: I3a295cfdc404c32228a54846e6efd3c0dcee5842
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6233
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Since the latest published version of rnix-parser on crates.io, the
crate has undergone major changes which are only available in the git
repository at the moment. This commit updates the compiler to this
newer version of rnix.
Most notably, the entire AST provided by rnix is now wrapped in the
AST type system. As a result of this traversal is much nicer in many
places, especially for things like nested attribute selection.
There are a handful of smaller features missing for full feature
parity with the previous version, especially handling of path
literals, but PRs for these already exist in rnix-parser.
Change-Id: Icde6d393067976549492b7d89c4cc49e5e575fc7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6231
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This makes for much more readable output especially when long strings
are involved.
Change-Id: I43dd73a0480535d7181a760788c42883a9b083f8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6229
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
This adds a `disassembler` feature to the crate configuration that
traces the operations executed and the state of the stack at runtime.
This can be enabled by compiling with `--feature disassembler`.
This will also gain a more sensible layout of code slices eventually.
Change-Id: I34c15e1cd346ecc4362b5afba6bf82dd49359d20
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6193
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Canonicalisation performs much more functionality than what C++ Nix
implements for paths, and causes some undesirable behaviour (e.g.
handling non-existant files becomes difficult, but should be possible
in literals).
Instead, the path_clean crate provides a pure normalisation method.
There is an intention to add this to Rust itself:
https://github.com/rust-lang/rfcs/issues/2208
Change-Id: I775d238136db0a52cf6b12a68985833c8fb32882
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6186
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
This crate provides sensible default locations for directories on
different platforms.
Change-Id: I0b61cc7f626dc6c8df903ba0f873be24e07d69b5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6170
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
There's a few options for this, but this one seems fine in terms of
features and doesn't have an insane amount of dependencies.
Change-Id: Ief99e66bfee0ba0ba1cfdd09568b002121b7325b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6169
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
The only uses of the static variant were for `"name"` and `"value"`,
which are both small enough to fit into a SmolStr. The size of
NixString accomodates `String` anyways, so we may as well inline them.
Additionally smol_str is already in the dependency graph because rnix
uses it, and using it for representations of identifiers is sensible.
Change-Id: I9969312256d1657d69128e54c47dc7294a18ce58
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6165
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: grfn <grfn@gws.fyi>
Bootstrap some (initially very simple, mostly proof-of-concept)
benchmarking infrastructure using Criterion, using the newly-exposed lib
from tvix-eval.
Change-Id: I4bb93c142ba8d018d7e67e58ac8907a0429398a5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6156
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Autosubmit: grfn <grfn@gws.fyi>
This crate makes it easy to generate test cases from files on disk,
which is used for running the Nix test suite against Tvix.
Change-Id: I60ef26484d05e723982679dd42958adf52735916
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6125
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
