This library provides a way to execute the native toplevel on x86 platforms without running external processes such as as and ln as the regular native toplevel does. Everything is handled in process which results in much better performances

At the moment, it builds on top of 4.11 and requires a few simple modification to the compiler which can be found here.

If you just want to give it a quick spin you can run:

git clone [email protected]:NathanReb/ocaml-jit.git
cd ocaml-jit
opam compiler create --switch=. NathanReb:jit-hook-411
opam install --deps-only ./
dune exec jittop

To use it in your project you will need to use the above mentioned compiler fork, you can create a fresh local switch on top of it using the opam-compiler plugin as follows:

opam compiler create --switch=. NathanReb:jit-hook-411

To make the native toplevel accessible by dune and ocamlfind you will also need to use compiler-libs-opttoplevel. You can pin it using:

opam pin add compiler-libs-opttoplevel.0.1.0 git+https://github.com/NathanReb/compiler-libs-opttoplevel.git#0.1.0

And pin jit using:

opam pin add jit.0.1.2 git+https://github.com/NathanReb/ocaml-jit.git#0.1.2

If you want to use #require directives in your JIT based toplevel, you will also need to use opttopfind:

opam pin opttopfind.0.1.0 git+https://github.com/NathanReb/opttopfind.git#0.1.0

We won't be able to release ocaml-jit before some hooks and improvements have been merged into the compiler. In the meantime, we maintain a branch of MDX built on top of this, you can find it here.

If you want to use that branch you will need to pin the above mentioned packages along with jit because opam doesn't handle pin-depends recursively. You can also add the following to your project's opam file:

pin-depends: [
  [
    "compiler-libs-opttoplevel.0.1.0"
    "git+https://github.com/NathanReb/compiler-libs-opttoplevel.git#0.1.0"
  ]
  [
    "opttopfind.0.1.0"
    "git+https://github.com/NathanReb/opttopfind.git#0.1.0"
  ]
  [
    "jit.0.1.2"
    "git+https://github.com/NathanReb/ocaml-jit.git#0.1.1"
  ]
  [
    "mdx.dev"
    "git+https://github.com/realworldocaml/mdx.git#mdx-with-jit"
  ]
]