... and emit a warning if anyone decides to use.
Change-Id: Iaa6fe9fa932340e6d0fa9f357155e78823702576
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6611
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Yep.
This is kind of ugly right now. The idea is that the recursive_scope
compilation function is used for recursive sets as well by emitting
the keys. The rest of the logic is pretty much identical.
There is quite a lot of code here that can be cleaned up (duplication
between attrs and let, duplication inside of the recursive scope
compilation function etc.), but I'd like to get it working first and
then make it nice.
Note that nested keys are *not* supported yet.
Change-Id: I45c7cdd5f0e1d35fd94797093904740af3a97134
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6610
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This type is used in the list temporarily populated by the *second*
pass over all identifiers in a recursive scope. This first pass only
serves to make all bindings known to the compiler, without populating
their values yet.
Having a type here is going to be useful once we implement `rec`,
which needs to thread through slightly more information.
Change-Id: Ie33e0f096c5fcb6c864c991255466748b6f0d1eb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6609
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This needs to be reused between let & `rec` attrs.
Change-Id: I4a3bb90af4be32771b0f9e405c19370e105c0fef
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6608
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This makes the phases of attribute set construction that Nix has very
explicit (inherits, static keys, dynamic keys).
This change focuses on the split between dynamic/static keys by
collecting all dynamic ones while compiling the static ones, and then
phasing them in afterwards. It's possible we also need to do some
additional splitting inside of the inherits.
Change-Id: Icae782e2a5c106e3ce0831dda47ed81c923c0a42
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6530
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This function is necessary for all builtins that expect some form of
path as an argument. It is merely a wrapper around coerce_to_string that
can shortcut if we already have a path. The absolute path check is done
in the same way as in C++ Nix for compatibility, although it should
probably be revised in the long term (think about Windows, for example).
Since coercing to a path is not an operation possible in the language
directly, this function can live in the builtins module as the only
place it is required.
Change-Id: I69ed5455c00d193fea88b8fa83e28907a761cab5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6574
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Define `.len()` method on `NixAttrs` to preallocate the capacity of the result
vector.
Also anchor an errant comment to its context (I think).
Change-Id: I268f15025d453d7b3ae1146558c80e51433dd2a8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6546
Reviewed-by: wpcarro <wpcarro@gmail.com>
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
This allows us to get rid of the count local variable which was a bit
confusing. Calling parts.len() multiple times is fine, since the length
doesn't need to be computed.
Change-Id: I4f626729ad1bf23a93cb701385c3f4b50c57456d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6584
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
With this puzzle piece of string compilation in place, `compile_str`
becomes less redundant, as every part now needs to be compiled the same.
The thunking logic becomes a bit trickier, since we need to thunk even
in the case of `count == 1` if the single part is interpolating.
Splitting the inner (shared) code in a separate function turned out to
be easier for making rustc content.
Change-Id: I6a554ca599926ae5907d7acffce349c9616f568f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6582
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
If we have multiple string parts, we need to thunk assembling the
string. If we have a single literal, it is strict (like all literals),
but a single interpolation part may compile to a thunk, depending on how
the expression inside is compiled – we can avoid forcing to early here
compared to the previous behavior.
Note that this CL retains the bug that `"${x}"` is erroneously
translated to `x`, implying e.g. `"${12}" == 12`.
The use of `parts.len()` is unproblematic, since normalized_parts()
builds a `Vec` instead of returning an iterator.
Change-Id: I3aecbfefef65cc627b1b8a65be27cbaeada3582b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6580
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Implement C++ Nix's `EvalState::coerceToString` minus some of the Path
/ store handling. This is currently only used for `toString` which does
all possible coercions, but we've already prepared the weaker coercion
variant which is e.g. used for builtins that expect string arguments.
`EvalState::coerceToPath` is still missing for builtins that need a
path, but it'll be easy to build on top of this.
Change-Id: I78d15576b18921791d04b6b1e964b951fdef22c6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6571
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
OpAttrsIsSet and OpAttrsTrySelect will fail silently if the attribute
set value on the stack is actually a thunk, so we need to make sure to
force at every step of the way.
Emitting the force instructions in the compiler because it is easier to
add, but maybe the VM should do this when handling the relevant opcodes?
Comments welcome.
Change-Id: I65c5ef348d59b2d07c9bb06abb24f9f3e6a0fdb2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6540
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
This prevents Nix programs to observe the "internal" type of thunks.
Possibly .type_of() is also an area of the runtime where we should panic
if "internal" would ever be returned.
Change-Id: I9f358044c48ad64896fb6a1b1a42f00a29efac00
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6539
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: wpcarro <wpcarro@gmail.com>
Reviewed-by: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
The expression inside ${…} may return arbitrary values, including
thunks, so we need to make sure to force them just in case.
Change-Id: Ic11ba00c4c92a10a83becd91233db5f57f6e59c8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6541
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Avoids accidentally dropping one on the floor if we add more, pointed
out by sterni in cl/6372
Change-Id: Ib7bb0ce9c8331c8337003d20c4d5240dfae1c32a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6570
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Pointed out by sterni in cl/6370
Change-Id: I324d8049a2702ced8f30ad43a64d63ae79dd0eab
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6569
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Pointed out by sterni in cl/6389
Change-Id: I648056a760266a8cfd7adcdc478c7ff2132991f7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6568
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Pointed out by sterni in cl/6395
Change-Id: I2dda2bb11fef702df05fd7a4fd93b9e717a85dad
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6567
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This is more useful than pointing it at the entire assert expression,
as that includes the body as well which is not going to be relevant in
the error.
Pointed out by sterni in cl/6391
Change-Id: I95a5d1edf90df65e7fa53d4d04502afd6e99e89a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6566
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This is no longer required, resolution is now more sane. Pointed out
by sterni in cl/6422.
Change-Id: Icc8983c648f864e66813948df6e2d4bad6a7f312
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6565
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This field no longer needs to be directly accessible by the compiler.
Addresses a sterni lint from cl/6466
Change-Id: I5e6791943d7f0ab3d9b7a30bb1654c4a6a435b1f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6564
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
As suggested by sterni in cl/6453.
Change-Id: I3cf80d97c11fd7d085ab510f6be4b5f937c791ec
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6562
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This very closely follows the way it's done for warnings, but errors
have a lot more information available in some cases which we do not
surface yet.
Note also that due to requiring the `CodeMap`, this is not yet called
from eval.rs as the way that is threaded through needs to be
refactored, so only the method for reporting these errors as strings
is implemented so far.
Next steps for this will be to add a generic diagnostics module that
reduces some of the boilerplate for this between warnings & errors,
and which will also give us a good point in the future to switch to a
fancier diagnostics crate.
Change-Id: If6bb209f8e7a568d866e516a90335b9b2afbf66d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6534
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
This implements an initial fancy display for warnings emitted by the
tvix compiler, using the codemap_diagnostic crate.
Each warning variant has an associated message, and optionally an
associated annotation for the span displayed to the user.
In theory we could get a lot more fancy with the display for specific
variants if needed (e.g. re-parse the AST and actually add multiple
semantic spans based on context), but this is already a good start.
Example:
tvix-repl> let toString = https://tvl.fyi; in let inherit toString; in ({}: 42) rec {}
warning[W004]: declared variable 'toString' shadows a built-in global!
--> [tvix-repl]:1:5
|
1 | let toString = https://tvl.fyi; in let inherit toString; in ({}: 42) rec {}
| ^^^^^^^^ variable declared here
warning[W001]: URL literal syntax is deprecated, use a quoted string instead
--> [tvix-repl]:1:16
|
1 | let toString = https://tvl.fyi; in let inherit toString; in ({}: 42) rec {}
| ^^^^^^^^^^^^^^^
warning[W002]: inherited variable already exists with the same value
--> [tvix-repl]:1:40
|
1 | let toString = https://tvl.fyi; in let inherit toString; in ({}: 42) rec {}
| ^^^^^^^^^^^^^^^^^
warning[W999]: feature not yet implemented in tvix: recursive attribute sets
--> [tvix-repl]:1:70
|
1 | let toString = https://tvl.fyi; in let inherit toString; in ({}: 42) rec {}
| ^^^^^^
warning[W999]: feature not yet implemented in tvix: closed formals
--> [tvix-repl]:1:62
|
1 | let toString = https://tvl.fyi; in let inherit toString; in ({}: 42) rec {}
| ^^
warning[W003]: variable 'toString' is declared, but never used:
--> [tvix-repl]:1:5
|
1 | let toString = https://tvl.fyi; in let inherit toString; in ({}: 42) rec {}
| ^^^^^^^^ variable declared here
=> 42 :: int
These are coloured when output to a terminal.
Change-Id: If315648a07e333895db4ae1d0915ee2013806585
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6532
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: grfn <grfn@gws.fyi>
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>
It is impossible for tvixbolt to recover from panics, so the user
experience of typing an expression using an unsupported feature was
that it would get sad and stop responding to input.
Instead, raise a normal value-level error of a new variant and
continue where possible.
Change-Id: Ibe016c92cacb87b85095c0f83758eddc6468053e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6528
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
This is used to drop an already emitted operation from a chunk again
and clean up its span tracking. This is required in cases where the
compiler has to backtrack.
Change-Id: I8112da9427688bb2dec96a2ddd12390f6e9734c3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6499
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Refactors the methods used for determining whether an identifier in a
binding (i.e. an `rnix::Attr` node) is a static string, and extracting
it.
Previously all uses of this logic were for `let`-expressions, where
dynamic attributes are always an error. However, we need the same
logic to properly implement the phase separation of attribute set
compilation.
To facilitate this, the actual core logic of these methods now return
`Option`, and are only converted to errors in cases where the errors
are actually required.
Change-Id: Iad7826eff2cb428182521c6f92276310edeae1eb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6498
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
There's about to be a lot more code for attrsets (hopefully
temporarily as part of an expand&contract cycle), while nested
attribute logic is being refactored in preparation for recursive
attribute sets.
This does not change any functionality.
Change-Id: I667565cd810ca7d9046120d1721c2ceb9095550b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6497
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
We need to make sure that we compile all plain inherits in a let
expression before declaring any other locals. Plain inherits are special
in the sense that they can never be recursive, instead resolving to a
higher scope. Thus we need to compile their value, before declaring
them. If we don't do that, before any other local can be declared,
we cause a situation where the plain inherits' values are placed into
other locals' stack slots.
Note that we can't integrate the plain inherit compilation into the
regular 2-3 phase model where we defer the compilation of the value or
we'd compile `let inherit x; in …` as `let x = x; in …`.
Change-Id: I951d5df3c9661a054e12401546875f4685b5bf08
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6496
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: sterni <sternenseemann@systemli.org>
This test shows that let bindings' dependencies can form a cyclical
graph, so we need to use thunking to break this cycle.
Change-Id: I2a4de71fd7024f3d3d1166154784139a82f39411
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6495
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: sterni <sternenseemann@systemli.org>
As the new test case demonstrates, asserts need to be evaluated lazily.
Change-Id: I808046722c5a504e9497855ca5026d255c7a4c34
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6494
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: sterni <sternenseemann@systemli.org>
The recent change that split declaration of let based locals and the
compilation of their values did not touch locals bound by inherit in
let. These were previously declared and compiled immediately before
starting to work on the other locals introduced in a let.
In the case of plain inherits, this behavior is kept in this change,
because there's nothing wrong with it: The value of a plain inherit will
always resolve to a higher scope, either statically or dynamically.
Since inherit (from) expression might refer to other locals bound in the
same let, we need to handle them in the same three steps as ordinary let
based locals:
1. We need to declare the (uninitialised) locals.
2. We need to compile the expression that obtains their value. For this,
we create a new thunk, since the from expression may very well return
a thunk which we need to force before selecting the value we are
interested in.
3. Thunks need to be finalised.
For 1., we create an extra pass over the inherits that already declares
and initialises plain inherits and notes inherit (from) expressions in
the entries vector after declaring them. 2. only needs a bit of adapting
to create the thunks for selecting if appropriate, the rest of the
existing code can be reused.
Change-Id: Ie4ac1c0f9ffcbf7c07c452036aa8e577443af773
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6490
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
