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2022-11-25 r/5310 test(tvix/eval): add eval-okay-closure-pointer-compareAdam Joseph2-0/+15
This test case checks two things: * A sanity check that "pointer equality for functions" means not just the lambda, but also the upvalues. * To be pointer-equal, it is not enough for the upvalues to be normal-form equal (i.e. `nix_eq()`-equal); the upvalues must be *pointer*-equal. The second part of the test case checks for this. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: I4e59327a6f199b8212e97197b212e3c3934bb3f0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7372 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-11-24 r/5308 test(tvix/eval): test limits of builtins.seq's forcingsterni2-2/+2
Change-Id: I6dfc9108220762ef3372cd2739e91d79c01a55e1 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7366 Tested-by: BuildkiteCI Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su>
2022-11-23 r/5305 feat(tvix/eval): ExactSizeIterator for Iter<KeyValue<'a>> and KeysAdam Joseph1-0/+20
Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: Ia373eb30d8516a056f1349f9011dee9816593d6f Reviewed-on: https://cl.tvl.fyi/c/depot/+/7357 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-11-23 r/5303 feat(tvix/eval): improve panic!() messages in Thunk::value()Adam Joseph1-4/+4
Change-Id: I3b1284e28c350bfed84d643ae7f922f3487e1f2a Reviewed-on: https://cl.tvl.fyi/c/depot/+/7355 Autosubmit: Adam Joseph <adam@westernsemico.com> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-11-23 r/5302 feat(tvix/eval): add NixAttrs::into_iter()Adam Joseph1-0/+52
Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: Ib813d794177c623bf2f12fc2e6a6f304089607d1 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7356 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-23 r/5301 feat(tvix/eval): make NixList::clone() cheapAdam Joseph3-38/+36
When we start unrecursivifying (sp?) things, Rust's borrow checker is going to be a headache; its magic only works when you use the CPU stack as your call stack. Fixing the borrow checker issues usually involves adding lots of `clone()`s. Right now `NixList` is the only variant of `Value` that isn't cheap to clone() -- all the others are either a wrapper around Rc or else are of bounded size. Note that this requires dropping the `DerefMut for NixList` instance and using `Vec<Value>` instead in those situations. Change-Id: I5a47df66855342aa2064f8f3cb7934ff422d26bd Signed-off-by: Adam Joseph <adam@westernsemico.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/7359 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-21 r/5299 fix(tvix/eval): aggressively fix a borrow error in nix_eqVincent Ambo1-3/+9
When comparing Nix values for equality, an issue can occur where recursive values contain thunks to themselves which causes borrow errors when forcing them for comparison later down the line. To work around this we clone the values for now. There might be some optimisations possible like checking for thunk equality directly and short-circuiting on that (we have to check what Nix does). Change-Id: I7e75c992ea68f100058f52b4b46168da7d671994 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7314 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-11-21 r/5298 fix(tvix/eval): builtins.listToAttrs must force keysVincent Ambo1-7/+2
Change-Id: Ief9ebc2285a0c50654c2edd3351432dc1588f9fc Reviewed-on: https://cl.tvl.fyi/c/depot/+/7313 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-11-21 r/5297 fix(tvix/eval): ensure callable is forced when using call_withVincent Ambo2-1/+9
When passing multiple arguments, every intermediate callable needs to be forced as this is expected by the VM's call_value function. Also adds a debug assertion for this which makes it easier to spot exactly what went wrong. Change-Id: I3aa519cb6cdaab713bd18282bef901c4cd77c535 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7312 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-11-21 r/5296 test(tvix/eval): enable eval-okay-closure test from nix_testsVincent Ambo2-1/+2
This function covers builtins.genericClosure, seemingly including weird behaviour around the order in which the work set is processed. For some reason, in C++ Nix the test expectation is written in XML which we do not yet support, so I have created a new expectation file using `nix-instantiate --eval --strict` on the file (yes, using C++ Nix). Change-Id: Id90e7117d120dc66d963a51083c4d8e8f2d9f181 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7311 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-11-21 r/5295 feat(tvix/eval): Implement builtins.genericClosureVincent Ambo1-0/+47
This implementation closely follows the original implementation in Nix, including the use of an equality-based "set" structure to track keys that have already been processed. Note that this test does not yet enable the `notyetpassing` test for builtins.genericClosure because (for as of yet unknown reasons) this test compares against XML output (however, evaluating the test case actually does work). This takes us one step closer to nixpkgs eval. This commit was written somewhere in the North Sea. Co-Authored-By: Griffin Smith <root@gws.fyi> Change-Id: I450a866e6f2888b27c2fe7c7f77ce0f79bfe3e6c Reviewed-on: https://cl.tvl.fyi/c/depot/+/7310 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-11-10 r/5276 feat(tvix/eval): detect division by zerojhahn4-1/+22
This detects if the second argument of a division is a zero (either as integer or as float). If so, an error message is displayed. This fixes b/219. Change-Id: I50203d14a71482bc757832a2c8dee08eb7d35c49 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7258 Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
2022-11-08 r/5269 feat(tvix/eval): Add docstrings as documentation for builtinsGriffin Smith3-0/+12
Add a new `documentation: Option<&'static str>` field to Builtin, and populate it in the `#[builtins]` macro with the docstring of the builtin function, if any. Change-Id: Ic68fdf9b314d15a780731974234e2ae43f6a44b0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7205 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-11-08 r/5268 feat(tvix/eval): Give names to builtin argumentsGriffin Smith5-37/+66
Refactor the arguments of a Builtin to be a vec of a new BuiltinArgument struct, which contains the old strictness boolean and also a static `name` str - this is automatically determined via the ident for the corresponding function argument in the proc-macro case, and passed in in the cases where we're still manually calling Builtin::new. Currently this name is unused, but in the future this can be used as part of a documentation system for builtins. Change-Id: Ib9dadb15b69bf8c9ea1983a4f4f197294a2394a6 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7204 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-08 r/5267 refactor(tvix/eval): Be clearer about public interfaceGriffin Smith1-2/+9
Some new top-level re-exports (specifically VM, Builtin, and ErrorKind) were added to lib.rs in tvix/eval to allow the builtin-macros tests to work - we should be clear which of these are part of the public interface (I think it's reasonable for ErrorKind to be) and which aren't (specifically I'm not sure VM and Builtin necessarily should be, at least yet). Change-Id: I3bbeaa63cdda9227224cd3bc298a9bb8da4deb7c Reviewed-on: https://cl.tvl.fyi/c/depot/+/7203 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-11-08 r/5266 refactor(tvix/eval): Define impure builtins using the macroGriffin Smith1-48/+56
Similar to what we did with pure builtins, define the impure builtins within a module at the top-level using the new #[builtins] attribute macro Change-Id: Ie5d5135d00bb65e651531df6eadba642cd4eb08e Reviewed-on: https://cl.tvl.fyi/c/depot/+/7202 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-08 r/5265 refactor(tvix/eval): Define *all* pure builtins at the top-levelGriffin Smith1-728/+792
Break out all pure builtin functions to top-level functions defined within the `pure_builtins` module in `builtins/mod.rs`. Change-Id: I9a10660446d557b1a86da4c45a463e9a1a9b4f2d Reviewed-on: https://cl.tvl.fyi/c/depot/+/7201 Reviewed-by: tazjin <tazjin@tvl.su> Reviewed-by: Adam Joseph <adam@westernsemico.com> Tested-by: BuildkiteCI
2022-11-08 r/5264 refactor(tvix/eval): Define a single builtin at the top levelGriffin Smith1-5/+16
Mostly as a proof-of-concept of the new proc-macros for defining builtins, define a single builtin (the first in the list, `abort`) at the top-level of a child module within builtins/mod.rs, and add it to the list of builtins returned from `pure_builtins`. If this works nicely, we can start breaking out the rest of the builtins into the top-level too, in addition to introducing additional sets of builtins (to differentiate between pure and impure builtins). Change-Id: I5bdd57c57fecf8d63c9fed4fc6b1460f533b20f2 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7199 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-11-08 r/5263 feat(tvix/eval): Add a proc-macro for defining builtinsGriffin Smith1-3/+3
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
2022-11-08 r/5262 feat(tvix/eval): add helper for selecting required attributesVincent Ambo1-0/+7
Change-Id: Idd4ae78ef55891d89b72b5c2f3afc8b697b4b26e Reviewed-on: https://cl.tvl.fyi/c/depot/+/7189 Reviewed-by: grfn <grfn@gws.fyi> Reviewed-by: Adam Joseph <adam@westernsemico.com> Tested-by: BuildkiteCI Autosubmit: tazjin <tazjin@tvl.su>
2022-11-06 r/5255 feat(tvix/eval): placeholder builtin implementationsVincent Ambo3-9/+43
Adds initial placeholders for builtins.{derivation, unsafeDiscardStringContext}. Change-Id: I67a126c9b9f9f4f11e2256e69b9a32ebd9eb1b0e Reviewed-on: https://cl.tvl.fyi/c/depot/+/7187 Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-11-06 r/5254 refactor(tvix/eval): move `unwrap_or_clone_rc` to lib moduleVincent Ambo2-6/+9
This is more generally useful than just inside the VM, until it is stabilised in Rust itself. Change-Id: Id9aa3d5b533ff38e3d2c6b85ad484394fdd05dcf Reviewed-on: https://cl.tvl.fyi/c/depot/+/7186 Tested-by: BuildkiteCI Autosubmit: tazjin <tazjin@tvl.su> Reviewed-by: grfn <grfn@gws.fyi> Reviewed-by: Adam Joseph <adam@westernsemico.com>
2022-11-05 r/5252 fix(tvix/eval): change ordinary (//) to rustdoc-comments (///)Adam Joseph1-3/+3
This fixes a mistake I made in d978b556e6. Change-Id: I88db697105a7149e9785f6aface03bff68566d2b Signed-off-by: Adam Joseph <adam@westernsemico.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/7085 Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-11-05 r/5251 fix(tvix/eval): Scope.inherit(): fix scope_depth, with_stack_depthAdam Joseph1-0/+2
Scope_depth and with_stack_depth were being reset to zero for nested function abstractions. Fortunately nothing depends on them being computed correctly in these cases, but it sure was confusing. Change-Id: I59980b6a5aff043f60079f97211220b0086eb97d Signed-off-by: Adam Joseph <adam@westernsemico.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/7091 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-05 r/5250 refactor(tvix/eval): rename Opcode::DataLocalIdx to DataStackIdxAdam Joseph4-7/+7
It is very confusing that this opcode is called DataLocalIdx, but it carries a StackIdx rather than a LocalIdx. It seems like this really ought to be called DataStackIdx, but maybe I've misunderstood; if so please explain it to me. Change-Id: I91f6ffa759412beef0b91d3c19ec0d873fe51b99 Signed-off-by: Adam Joseph <adam@westernsemico.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/7088 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-04 r/5245 docs(tvix/eval): add comments for Opcode::DataXXX opcodesAdam Joseph1-2/+8
Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: I8c72405880a9342eb502d92c1e0087f5bb17e03c Reviewed-on: https://cl.tvl.fyi/c/depot/+/7087 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-11-04 r/5244 feat(tvix/eval): implement builtins.splitAdam Joseph3-0/+38
This implements builtins.split, and passes eval-okay-regex-split.nix (which is moved out of notyetpassing). Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: Ieb0975da2058966c697ee0e2f5b3f26ccabfae57 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7143 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-11-04 r/5242 test(tvix/eval): add a test case for groupBy with thunksAdam Joseph2-0/+7
We have to be careful implementing `builtins.groupBy`, since the list may contain thunks, and tvix's to_xxx() functions do not work on thunks. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: I182b6fc2d4296f864ed16744ef70b153e8e6978a Reviewed-on: https://cl.tvl.fyi/c/depot/+/7039 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-04 r/5241 fix(tvix/eval): quote keys which are not valid identifiersAdam Joseph3-1/+26
The impl Display for NixAttrs needs to wrap double quotes around any keys which are not valid Nix identifiers. This commit does that, and adds a test (which fails prior to this commit and passes after this commit). Change-Id: Ie31ce91e8637cb27073f23f115db81feefdc6424 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7084 Autosubmit: Adam Joseph <adam@westernsemico.com> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-04 r/5240 fix(tvix_eval): {stack,local}_idx confusionAdam Joseph1-4/+4
The variable name `local_idx` is used here for a StackIdx, which invites confusion. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: I2e22db90acdc0d29586ee5b72ea18d42d93badcb Reviewed-on: https://cl.tvl.fyi/c/depot/+/7086 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-04 r/5237 fix(tvix/eval): inline mis-named Local::above()Adam Joseph1-6/+1
If self.depth > other.depth then self is deeper than other, so self is *below* other, not above it. Let's just inline the function. Change-Id: I8dda3d90cbc86c8a6fa01bc4a5e506a2e403bd20 Signed-off-by: Adam Joseph <adam@westernsemico.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/7090 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-11-04 r/5236 fix(tvix/eval): remove impl PartialEq for ValueAdam Joseph8-24/+31
It isn't possible to implement PartialEq properly for Value, because any sensible implementation needs to force() thunks, which cannot be done without a `&mut VM`. The existing derive(PartialEq) has false negatives, which caused the bug which cl/7142 fixed. Fortunately that bug was easy to find, but a silent false negative deep within the bowels of nixpkgs could be a real nightmare to hunt down. Let's just remove the PartialEq impl for Value, and the other derive(PartialEq)'s that depend on it. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: Iacd3726fefc7fc1edadcd7e9b586e04cf8466775 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7144 Reviewed-by: kanepyork <rikingcoding@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-10-31 r/5226 fix(tvix/eval): nix_eq() must recurseAdam Joseph5-3/+5
The current implementation of nix_eq will force one level of thunks and then switch to the (non-forcing) rust Eq::eq() method. This gives incorrect results for lists-of-thunks. This commit changes nix_eq() to be recursive. A regression test (which fails prior to this commit) is included. This fix also causes nix_tests/eval-okay-fromjson.nix to pass, so it is moved out of notyetpassing. Change-Id: I655fd7a5294208a7b39df8e2c3c12a8b9768292f Signed-off-by: Adam Joseph <adam@westernsemico.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/7142 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-10-29 r/5223 test(tvix/eval): builtins.sort must preserve order of equal elementssterni2-0/+8
Change-Id: I59a0756940d1e5360a2ab4e886cf0bc9af7b8901 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7133 Autosubmit: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-10-29 r/5222 feat(tvix/eval): Implement builtins.sortGriffin Smith4-3/+46
This is a bit tricky because the comparator can throw errors, so we need to propagate them out if they exist and try to avoid sorting forever by returning a reasonable ordering in this case (as short-circuiting is not available). Co-Authored-By: Vincent Ambo <tazjin@tvl.su> Change-Id: Icae1d30f43ec1ae64b2ba51e73ee467605686792 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7072 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-10-29 r/5221 feat(tvix/eval): Implement comparison for listsGriffin Smith6-3/+44
Lists are compared lexicographically in C++ nix as of [0], and our updated nix test suites depend on this. This implements comparison of list values in `Value::nix_cmp` using a very similar algorithm to what C++ does - similarly to there, this requires passing in the VM so we can force thunks in the list elements as we go. [0]: https://github.com/NixOS/nix/commit/09471d2680292af48b2788108de56a8da755d661# Change-Id: I5d8bb07f90647a1fec83f775243e21af856afbb1 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7070 Autosubmit: grfn <grfn@gws.fyi> Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-10-28 r/5220 feat(tvix/eval): builtins.replaceStrings: don't clone() N timesAdam Joseph1-8/+10
CL/7034 looks great, except that for a length-N target string it will perform N deep copies of each of the from and to-lists. Let's use references instead of clones. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: Icd341213a9f0e728f9c8453cec6d23af5e1dea91 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7095 Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: j4m3s <james.landrein@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-10-28 r/5219 feat(tvix/eval): add builtins.replaceStringsJames Landrein5-0/+77
Change-Id: I93dcdaeb101364ee2273bcaeb19acb57cf6b9e7d Reviewed-on: https://cl.tvl.fyi/c/depot/+/7034 Autosubmit: j4m3s <james.landrein@gmail.com> Reviewed-by: Adam Joseph <adam@westernsemico.com> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-10-28 r/5218 docs(tvix/eval): warn that AttrsRep::KV is not for Key-Value pairsAdam Joseph1-1/+8
I assumed that AttrsRep::KV represented attrsets with a single attribute as a Key-Value pair. That is not the case. Let's warn other people about this. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: Ie3d2765fcc1ab705c153ab94ffe77bbd6d4ab39e Reviewed-on: https://cl.tvl.fyi/c/depot/+/7093 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-10-27 r/5215 fix(tvix/eval): correct wasm32-unknown-unknown to wasm32-noneAdam Joseph1-0/+11
Rustc uses wasm32-unknown-unknown, which is rejected by config.sub, for wasm-in-the-browser environments. Rustc should be using wasm32-unknown-none, which config.sub accepts. Hopefully the rustc people will change their triple before stabilising this triple. In the meantime, we fix it here in order to unbreak tvixbolt. https://doc.rust-lang.org/beta/nightly-rustc/rustc_target/spec/wasm32_unknown_unknown/index.html Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: I941fd8d6f3db4e249901772fd79321ad88cd9cc6 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7107 Reviewed-by: tazjin <tazjin@tvl.su> Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-10-27 r/5214 refactor(tvix/eval): search-and-replace changesAdam Joseph1-5/+5
This commit contains two search-and-replace renames which are broken out from I04131501029772f30e28da8281d864427685097f in order to reduce the noise in that CL: - `is_thunk -> is_suspended_thunk`, since there are now OpThunkClosure and OpThunkSuspended - `compile_lambda_or_thunk` -> `compile_lambda_or_suspension` Change-Id: I7cc5bbb75ef6605e3428c7be27e812f41a10c127 Signed-off-by: Adam Joseph <adam@westernsemico.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/7037 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-10-27 r/5213 feat(tvix/eval): builtins.import without RefCellAdam Joseph5-137/+154
CL/6867 added support for builtins.import, which required a cyclic reference import->globals->builtins->import. This was implemented using a RefCell, which makes it possible to mutate the builtins during evaluation. The commit message for CL/6867 expressed a desire to eliminate this possibility: 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. This CL replaces the RefCell with Rc::new_cyclic(), making the globals/builtins immutable once again. At VM runtime (once opcodes start executing) everything is the same as before this CL, except that the Rc<RefCell<>> introduced by CL/6867 is turned into an rc::Weak<>. The function passed to Rc::new_cyclic works very similarly to overlays in nixpkgs: a function takes its own result as an argument. However instead of laziness "breaking the cycle", Rust's Rc::new_cyclic() instead uses an rc::Weak. This is done to prevent memory leaks rather than divergence. This CL also resolves the following TODO from CL/6867: // TODO: encapsulate this import weirdness in builtins The main disadvantage of this CL is the fact that the VM now must ensure that it holds a strong reference to the globals while a program is executing; failure to do so will cause a panic when the weak reference in the builtins is upgrade()d. In theory it should be possible to create strong reference cycles the same way Rc::new_cyclic() creates weak cycles, but these cycles would cause a permanent memory leak -- without either an rc::Weak or RefCell there is no way to break the cycle. At some point we will have to implement some form of cycle collection; whatever library we choose for that purpose is likely to provide an "immutable strong reference cycle" primitive similar to Rc::new_cyclic(), and we should be able to simply drop it in. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: I34bb5821628eb97e426bdb880b02e2097402adb7 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7097 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-10-26 r/5201 docs(tvix/eval): StackIdx, LocalIdx UpvalueIdxAdam Joseph2-5/+7
This adds a comment noting that StackIdx is an offset relative to the base of the current CallFrame, whereas UpvalueIdx is an absolute index into the upvalues array. It also removes the confusing mention of StackIdx in the descriptive comment for LocalIdx. They index into totally different structures; one exists at runtime and the other exists at compile time. Change-Id: Ib932b1b0679734c15001e8c5c95a08293fa016b4 Signed-off-by: Adam Joseph <adam@westernsemico.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/7017 Reviewed-by: grfn <grfn@gws.fyi> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-10-26 r/5200 feat(tvix/eval): add NixList::force_elements()Adam Joseph1-0/+5
This adds a function NixList::force_elements() which forces each element of the list shallowly. This behavior is needed for `builtins.replaceStrings`, and probably a few other builtins as well. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: I3f0681acbbfe50e781b5f07b6a441647f5e6f8da Reviewed-on: https://cl.tvl.fyi/c/depot/+/7094 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-10-26 r/5199 feat(tvix/eval): include filename of failing test when failingAdam Joseph1-5/+5
Unfortunately we have to mangle test case filenames into rust-valid symbols, since test-generator doesn't use `r#"..."` (deliberately?). This means that when a test fails, there's nothing on the console you can copy-and-paste in order to view/edit the code of the failing test case. This commit (partially) fixes it by including the unmangled name in the panic!() string. However failures due to panic!()s inside the vm (including deliberate panics due to panic!()-debugging) still won't display an unmangled filename. Maybe we should reconsider the use of test-generator? Change-Id: I2208a859ffab1264f17f48fd303ff5e19675967e Signed-off-by: Adam Joseph <adam@westernsemico.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/7092 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-10-25 r/5198 feat(tvix/eval): add builtins.{floor,ceil}James Landrein6-0/+11
Change-Id: I4e6c4f96f6f5097a5c637eb3dbbd7bb8b34b7d52 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7032 Autosubmit: j4m3s <james.landrein@gmail.com> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su> Reviewed-by: grfn <grfn@gws.fyi>
2022-10-24 r/5193 refactor(tvix/eval): Implement value comparison with a methodGriffin Smith3-26/+47
Rather than implementing all of the interesting semantics of value comparison with a macro bound to the VM, implement the bulk of the logic with a method on Value itself that returns an Ordering, and then use the macro to implement the comparison against that Ordering. This has no functional change, but paves the way to implementing lexicographic comparison of list values, which is supported in the latest version of upstream nix. Change-Id: I8af1a020b41577021af5939f5edc160c407d4a9e Reviewed-on: https://cl.tvl.fyi/c/depot/+/7069 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-10-24 r/5192 feat(tvix/eval): Implement builtins.mapAttrsGriffin Smith4-0/+23
I played around a little bit with doing this in-place, but ended up going with this perhaps slightly clone-heavy approach for now because ideally most clones on Value are cheap - but later we should benchmark alternate approaches that get to reuse allocations better if necessary or possible. Change-Id: If998eb2056cedefdf2fb480b0568ac8329ccfc44 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7068 Autosubmit: grfn <grfn@gws.fyi> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-10-24 r/5191 feat(tvix/eval): add builtins.langVersionVincent Ambo1-0/+2
The last bump in langVersion (5->6) in C++ Nix was due to making lists comparable (commit `09471d2680292af48b2788108de56a8da755d661`), which we support in Tvix with cl/7070. Change-Id: Id3beed5150b8fb6e0a46a4d1b7e3942022a65346 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7074 Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-10-24 r/5190 feat(tvix/eval): implement builtins.currentSystemAdam Joseph5-0/+351
This commit implements builtins.currentSystem, by capturing the cargo environment variable `TARGET` and exposing it to rustc as `TVIX_CURRENT_SYSTEM` so it can be inserted into the source code using `env!()`. The resulting value needs to be massaged a bit, since it is an "LLVM triple". The current code should work for all the platforms for which cppnix works (thanks qyliss for generating the list!). It does *not* reject all of the triples that cppnix's configure.ac rejects -- it is much more forgiving. We can tighten this up in a future commit. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: I947f504b2af5a7fee8cf0cb301421d2fc9174ce1 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6986 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
generated by cgit-pink 1.4.1 (git 2.44.2) at 2024-11-27T15·29+0000