Now we guarantee that whenever we write a file there is a newline
character at the end, which is a [Unix
convention](https://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_205).
The juvix prelude now exports `writeFileEnsureLn` and it no longer
exports `writeFile`. If at some point we need the behaviour of
`writeFile` I'd suggest that we export it renamed as `writeFileVerbatim`
or something similar.
This PR contains refactors split out from the Nockma compile PR
https://github.com/anoma/juvix/pull/2570. Each refactor is associated
with a separate commit in this PR.
* Closes#2392
Changes checklist
-----------------
* [X] Abstract out data types for stored module representation
(`ModuleInfo` in `Juvix.Compiler.Store.Language`)
* [X] Adapt the parser to operate per-module
* [X] Adapt the scoper to operate per-module
* [X] Adapt the arity checker to operate per-module
* [X] Adapt the type checker to operate per-module
* [x] Adapt Core transformations to operate per-module
* [X] Adapt the pipeline functions in `Juvix.Compiler.Pipeline`
* [X] Add `Juvix.Compiler.Pipeline.Driver` which drives the per-module
compilation process
* [x] Implement module saving / loading in `Pipeline.Driver`
* [x] Detect cyclic module dependencies in `Pipeline.Driver`
* [x] Cache visited modules in memory in `Pipeline.Driver` to avoid
excessive disk operations and repeated hash re-computations
* [x] Recompile a module if one of its dependencies needs recompilation
and contains functions that are always inlined.
* [x] Fix identifier dependencies for mutual block creation in
`Internal.fromConcrete`
- Fixed by making textually later definitions depend on earlier ones.
- Now instances are used for resolution only after the textual point of
their definition.
- Similarly, type synonyms will be unfolded only after the textual point
of their definition.
* [x] Fix CLI
* [x] Fix REPL
* [x] Fix highlighting
* [x] Fix HTML generation
* [x] Adapt test suite
This patch dramatically increases the efficiency of `juvix dev root`,
which was unnecessarily parsing all dependencies included in the
`Package.juvix` file. Other commands that do not require the `Package`
will also be faster.
It also refactors some functions so that the `TaggedLock` effect is run
globally.
I've added `singletons-base` as a dependency so we can have `++` on the
type level. We've tried to define a type family ourselves but inference
was not working properly.
## Overview
This PR makes the compiler pipeline thread-safe so that the test suite
can be run in parallel.
This is achieved by:
* Removing use of `{get, set, with}CurrentDir` functions.
* Adding locking around shared file resources like the the
global-project and internal build directory.
NB: **Locking is disabled for the main compiler target**, as it is
single threaded they are not required.
## Run test suite in parallel
To run the test suite in parallel you must add `--ta '+RTS -N -RTS'` to
your stack test arguments. For example:
```
stack test --fast --ta '+RTS -N -RTS'
```
The `-N` instructs the Haskell runtime to choose the number of threads
to use based on how many processors there are on your machine. You can
use `-Nn` to see the number of threads to `n`.
These flags are already [set in the
Makefile](e6dca22cfd/Makefile (L26))
when you or CI uses `stack test`.
## Locking
The Haskell package
[filelock](https://hackage.haskell.org/package/filelock) is used for
locking. File locks are used instead of MVars because Juvix code does
not control when new threads are created, they are created by the test
suite. This means that MVars created by Juvix code will have no effect,
because they are created independently on each test-suite thread.
Additionally the resources we're locking live on the filesystem and so
can be conveniently tagged by path.
### FileLock
The filelock library is wrapped in a FileLock effect:
e6dca22cfd/src/Juvix/Data/Effect/FileLock/Base.hs (L6-L8)
There is an [IO
interpreter](e6dca22cfd/src/Juvix/Data/Effect/FileLock/IO.hs (L8))
that uses filelock and an [no-op
interpreter](e6dca22cfd/src/Juvix/Data/Effect/FileLock/Permissive.hs (L7))
that just runs actions unconditionally.
### TaggedLock
To make the file locks simpler to use a TaggedLock effect is introduced:
e6dca22cfd/src/Juvix/Data/Effect/TaggedLock/Base.hs (L5-L11)
And convenience function:
e6dca22cfd/src/Juvix/Data/Effect/TaggedLock.hs (L28)
This allows an action to be locked, tagged by a directory that may or
may not exist. For example in the following code, an action is performed
on a directory `root` that may delete the directory before repopulating
the files. So the lockfile cannot be stored in the `root` itself.
e6dca22cfd/src/Juvix/Extra/Files.hs (L55-L60)
## Pipeline
As noted above, we only use locking in the test suite. The main app
target pipeline is single threaded and so locking is unnecessary. So the
interpretation of locks is parameterised so that locking can be disabled
e6dca22cfd/src/Juvix/Compiler/Pipeline/Run.hs (L64)
* Restricts permutative conversions for case-expressions to
non-booleans. This reduces the blow-up a bit.
Permutative conversions rewrite
```
case (case M | C1 -> A1 | C2 -> A2)
| D1 -> B1
| D2 -> B2
```
to
```
case M
| C1 -> case A1
| D1 -> B1
| D2 -> B2
| C2 -> case A2
| D1 -> B1
| D2 -> B2
```
It is necessary to perform them for non-boolean A1/A2 to obtain the
right kind of normal forms.
* Adds a test demonstrating the necessity of permutative conversions for
non-booleans.
* Closes#2035
* Depends on #2086
* Depends on #2096
* Adds end-to-end tests for the Juvix-to-VampIR compilation pipeline.
---------
Co-authored-by: Jonathan Cubides <jonathan.cubides@uib.no>
* Closes#2034.
* Adds the `vampir` target to the `compile` command.
* Adds two tests which are not yet enabled because `vamp-ir` is not
available in the CI (these and more tests will be enabled in #2103).
