This commit implements builtins.toPath. Like OP_ADD, it currently
does not handle string contexts.
This commit allows the
tests::nix_eval_okay_src_tests_nix_tests_eval_okay_pathexists_nix
test to pass.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: Iadd4f7605f8f297adbd0dba187b8481c21370b6e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6996
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Maybe I misunderstood this part of the code, but the use of `unsafe`
appears unnecessary here? In any event it is the one and only
`unsafe` in the codebase.
Hopefully getting to "no `unsafe` anywhere" is worth the extra
never-taken branch caused by unwrap() instead of unwrap_unchecked()?
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I33fbd5aad9d8307ea82c24b6220412783e1973c6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7011
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
The case branch in vm.rs for OpResolveWithOrUpvalue is
unreachable/deadcode.
I believe this opcode is unnecessary, since it should always be
statically detectable (at parse-time) whether a reference is to an
upvalue (i.e. enclosing binding); otherwise, and only then, is
with-resolution applicable.
Perhaps I've misunderstood how with-resolution works. If so, please
explain it to me and -1/-2 this CL.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I4a90b9eb6cb3396df92a6a943d42ecc301871ba0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7009
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
This makes it easier to compare currently implemented ones with the full
list.
Change-Id: Ibaffd99d05afa15fc9ab644fd101afa24fc7a1b2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7008
Tested-by: BuildkiteCI
Autosubmit: j4m3s <james.landrein@gmail.com>
Reviewed-by: tazjin <tazjin@tvl.su>
When I first read the `README.md` I didn't know what this `mg build`
was. Some grepping around turned up `/tools/magrathea`. Apparently
this thing "helps me build planets". Awesome! Let's tell other
people where to find it. It seems that this tool is (currently)
specific to depot, so people who arrive at depot because of tvix
probably won't know where to find `mg`.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: Icb8c51087fd41b696794516abcfee24a4b3b4a14
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6948
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: tazjin <tazjin@tvl.su>
This commit implements builtins.baseNameOf and adds a test case
eval-okay-basenameof.nix to the test suite.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: Ib8bbafba2ac9ca0e1d3dc5e844167f94890d9fee
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6997
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
builtins.parseDrvName should not coerce its argument to a string.
This commit fixes that oversight in my previous commit, and adds an
xfail test to cover this condition.
Thanks to @sterni for noticing this.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I76bc78f1a82e1e08fe5c787c563a221d55de2639
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6991
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
This commit adds support for running the "expected failure" tests in
both the nix and tvix test suites.
I have disabled the eval-fail-blackhole.nix test because it gets
stuck running forever.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: Iba75ce6c8f2becab3c834fcfdd9f4fdc5a4bdb9f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6990
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: grfn <grfn@gws.fyi>
cppnix has merged #7149, so let's update our copy of their tests:
https://github.com/NixOS/nix/pull/7149
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I0be3bf9da937abd24102e1997daa2087ecfafd98
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6992
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
This path normalisation business causes runtime panics on WebAssembly
because those operations are unsupported.
Maybe this shouldn't be happening in the compiler anyways, not sure,
but for now this commit adds a workaround based on the target to
disable the normalisation if we're compiling for wasm.
Change-Id: I908a84fbdffc3401f8d443e2c73ec673e9f397ff
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7004
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Cppnix immediately absolutizes pathnames at parse time; if you write
`./foo`, it is immediately converted to `$(pwd)/foo` and manipulated
as an absolute path at all times.
To avoid having to introduce filesystem access operations in the
implementation of otherwise-pure builtins, let's guarantee that the
`root_dir` of the VM is always an absolute path.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I7cbbae2cba4b2716ff3f5ff7c9ce0ad529358c8a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6995
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Right now we're pretending that the Rust library path_clean does the
same thing that cppnix's canonPath() does. This is not true. It's
close enough for the test suite, but may come back to bite us.
Let's create our own canon_path() function and call that in all the
places where we intend to match the behavior of cppnix's
canonPath(). That way when we fix this we can fix it once, in one
place.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: Ia6f9577f62f49ef352ff9cfa5efdf37c32d31b11
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6993
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
On Debian machines (and most FHS distros) /bin is now a symlink to
/usr/bin, which causes this test to fail. Let's use /etc as a
root-relative test case, since it is less likely to be a symlink.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I1c94de0d2a242394182442fe1c895dc17eb04a4a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6994
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
The nix_tests test suite produces lots of warnings. We can't fix
these, since they are kept in sync with upstream, so there's little
point in cluttering up the console with them every time the tests
are run.
Let's add a clap flag "warnings" and TVIX_WARNINGS environment
variable. The default is "true". The test runner overrides this
default and mutes the warnings.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I4b065f96fe15838afcca6970491a54e248ae4df7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6985
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
This commit passes nix_eval_okay_src_tests_nix_tests_eval_okay_versions_nix.
See also: https://github.com/NixOS/nix/pull/7149
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I24605c2a0cd0da434f37f6c518f20693bfa1b799
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6913
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Since NixString is the Rust type for nix strings, people might
mistake NixPath for the Rust type of nix paths, which it is not.
Let's call it NixSearchPath instead.
Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: Ib2ea155c4b27cb90d6180a04ea7b951d86607373
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6927
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
I broke the build.
I didn't understand that before hitting "submit" you need to re-test
your changes on latest HEAD (and that CI doesn't do that for you); I
failed to re-test cl/6912 following the merge of cl/6907.
This commit fixes the build by removing the overlapping instances.
Change-Id: I2a720d2c60cc7103b350f78102a8998f93bac828
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6965
Tested-by: BuildkiteCI
Autosubmit: Adam Joseph <adam@westernsemico.com>
Reviewed-by: tazjin <tazjin@tvl.su>
When investigating discrepancies between foldl' in tvix and C++ Nix,
I discovered that C++ Nix's foldl' doesn't seem to be strict at all.
Since this seemed wrong, I looked into Haskell's foldl' implementation
which doesn't force the list elements (`val` in our code), but the
accumulation value (`res` in our code). You can look at the code here:
https://hackage.haskell.org/package/base-4.17.0.0/docs/src/GHC.List.html#foldl%27
This actually makes a lot of sense: If `res` is not forced after each
application of `op`, we'll end up thunks nested as deeply as the list is
long, potentially taking up a lot of space. This can be limited by
forcing the `res` thunk before applying `op` again (and creating a new
thunk).
I've also PR-ed an equivalent change for C++ Nix at
https://github.com/NixOS/nix/pull/7158. Since this is not merged nor
backported to our Nix 2.3 fork, I've not copied the eval fail test yet,
since it wouldn't when checking our tests against C++ Nix in depot.
Change-Id: I34edf6fc3031fc1485c3e714f2280b4fba8f004b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6947
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
This *maybe* should do something to check that we don't pass both a file
and an expr, but for now this is useful enough to cut corners (plus
we're probably due for a CLI revamp eventually anyway).
Change-Id: Id44357074150b336b6215ba596cc52d01d037dbd
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6941
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
This is currently implemented with a simple println inline, but in the
future we could hook into this via something pluggable on the VM.
Change-Id: Idd9cc3b34aa13d6ebc64c02aade81ecdf439656a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6938
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Previously, the VM assumed that if an error was returned from `run()`,
the evaluation was "finished" and the state of the VM didn't matter.
This used to be a reasonable assumption, but now that we've got
`tryEval` around we need to actually make sure that we clean up after
ourselves if we're about to return an error. Specifically, if the *last*
instruction in an evaluation frame returns an error, we previously
wouldn't pop that evaluation frame, which could cause all sorts of
bizarre errors based on what happened to be in the stack at the time.
This commit splits out a `run_op` method from `VM::run`, and uses that
to check the evaluation frame return condition even if the op we're
running is about to return an error, and pop the evaluation frame if
we're at the last instruction.
Change-Id: Ib40649d8915ee1571153cb71e3d76492542fc3d7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6940
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Currently, the span on *all* thunk force errors is the span at which the
thunk is forced, which for recursive thunk forcing ends up just being
the same span over and over again. This changes the span on thunk force
errors to be the span at which point the thunk is *created*, which is a
bit more helpful (though the printing atm is a little... crowded). To
make this work, we have to thread through the span at which a thunk is
created into a field on the thunk itself.
Change-Id: I81474810a763046e2eb3a8f07acf7d8ec708824a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6932
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: Adam Joseph <adam@westernsemico.com>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Previously the various call functions either returned `EvalResult<()>`
or `EvalResult<Value>`, which was confusing.
Now only vm::call_with returns a Value directly, and other parts of
the API just leave the stack top in the post-call state.
This makes it easier to reason about what's going on in non-tail-call
cases (which are making a comeback).
Change-Id: I264ffc683a11aca72dd06e2220a5ff6e7c5fc2b0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6936
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
Instead of just printing the number of errors (useless!) actually emit
separate diagnostics for each nested error.
Change-Id: I97b53c3276c906af5def89077b5b6ba6ec108b37
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6933
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Despite this not being documented, `tryEval` is empirically able to
catch errors caused by a <...> path not resolving (and nixpkgs depends
on this).
Change-Id: Ia3b78a2d9d2d0c603aba829518b351102dc55396
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6926
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Since the body of an `if` expr can refer to deferred upvalues, it needs
to be thunked so when we actually compile those deferred upvalues we
have something for the finalize op to point at. Without this all sorts
of weird things can happen due to the finalize op being run in the wrong
lambda context, up to and including a panic.
Change-Id: I040d5e1a7232fd841cfa4953539898fa49cbbb83
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6929
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
With asserts compiled using conditional jumps, this ends up being quite
straightforward - the only real tricky bit is that we have to know
whether an error can or can't be handled.
Change-Id: I75617da73b7a9c5cdd888c0e26ae81d2c5c0d714
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6924
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
This commit implements (lazy) resolution of `<...>` paths via either the
NIX_PATH environment variable, or the -I command-line flag - both
handled via EvalOptions. As a result, EvalOptions can no longer derive
Copy, meaning we have to clone it at each line of the repl - this is
probably not a huge deal as repl performance is not exactly an inner
loop and we're not cloning very much.
Internally, this works by creating a thunk which pushes a constant
containing the string inside the brackets to the stack, then a new
opcode to resolve that path via the `NixPath`. To get that opcode to
work, we now have to pass in the NixPath when constructing the VM.
This (intentionally) leaves out proper implementation of path resolution
via `findFile` (cppnix just calls whatever identifier called findFile is
in scope!!!) as that's widely considered a bit of a misfeature, but if
we do decide to implement that down the road it likely wouldn't be more
than a few extra ops within the thunk introduced here.
Change-Id: Ibc979b7e425b65cbe88599940520239a4a10cee2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6918
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Add a simple struct implementing both the string parsing and path
resolution rules of Nix's `NIX_PATH` environment variable, for use in
resolving `<...>`-style paths
Change-Id: Ife75f39aa5c12928278d81fe428fbadc98bac5cc
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6917
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: Adam Joseph <adam@westernsemico.com>
Tested-by: BuildkiteCI
Implement adding paths and strings via OpAdd. Since the nix rules are
quite obscure, I'm electing to test this one with an oracle test to
avoid the danger of getting the actual asserted result wrong.
Change-Id: Icdcca3690ca2e8459e386c1f29cc48eaaa39e9a3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6914
Autosubmit: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
In order to behave nicely with tryEval, asserts need to leave the
instruction pointer in a reasonable place even if they fail - whereas
with the previous implementation catching a failed assert would still
end up running the op for the *body* of the assert. With this change, we
compile asserts much more like an `if` expression with conditional jumps
rather than having an OpAssert op.
Change-Id: I1b266c3be90185c84000da6b1995ac3e6fd5471b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6925
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
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
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>
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
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
