The LHC Haskell Compiler aims at compiling Haskell2010 to LLVM IR using the HaskellSuite of libraries.
LHC is built by stack:
stack setup stack build stack exec lhc
Installing the lhc-prim library is required before the example programs can be compiled.
stack install cabal-install stack exec -- cabal update cd packages/lhc-prim/ stack exec -- cabal install --haskell-suite -w `stack exec -- which lhc`
After lhc-prim has been installed, all the programs in
examples/ will be
stack exec -- lhc build examples/HelloWorld.hs lli examples/HelloWorld.ll
You can run
lhc with the
--keep-intermediate-files flag to inspect the
various stages of the transformation from bedrock to llvm.
stack exec -- lhc build --verbose --keep-intermediate-files examples/HelloWorld.hs
Running the test suite is done via stack:
stack test && cat .stack-work/logs/lhc-*-test.log
Status (updated 2018-05-26)
LHC is comprised of separate libraries which are developed independenly and are in various states of completion.
Haskell-scope implements name resolution for a sizable subset of Haskell2010 but it's far from complete. So far it hasn't proved a bottleneck.
Haskell-tc implements type-checking and type-inference for a small subset of Haskell2010. Only the constructs used in the example programs are supported.
Haskell-crux is responsible for desugaring and, like haskell-tc, has only been defined for exactly those language constructs which are currently used by the example programs.
The base is extremely minimal and functions are implemented on a by-need basis.
None. Will eventually write a minimal implementation in either Haskell or C.
Not implemented yet but the RTS has been designed with exceptions in mind.
LHC has a simple but accurate semispace garbage collector.
Not supported. Will eventually use libuv.
Not supported. Will eventually use libicu.
Compilation pipeline and the relevant libraries:
┌──────────────────┐ │ Parsing │ │ haskell-src-exts │ └────────┬─────────┘ ┌────────┴────────┐ │ Name resolution │ │ haskell-scope │ └────────┬────────┘ ┌───────┴───────┐ │ Type-checking │ │ haskell-tc │ └───────┬───────┘ ┌──────┴───────┐ │ Desugaring │ │ haskell-crux │ └──────┬───────┘ ┌────────┴────────┐ │ Optimizing Core │ │ LHC │ └────────┬────────┘ ┌────┴────┐ │ Bedrock │ │ bedrock │ └────┬────┘ ┌───────┴───────┐ │ Generate LLVM │ │ bedrock │ └───────────────┘