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fish-jit

A just-in-time compiling interpreter for the ><> programming language, to be built with the RPython Toolchain.

Download the latest pypy source, and build as follows:

python2 /path/to/pypy3.10-v7.3.13-src/rpython/bin/rpython --opt=jit fish-jit.py

Build dependencies are listed separately: https://doc.pypy.org/en/latest/build.html#install-build-time-dependencies

The resulting executable will be named fish-jit-c or similar in the current working directory. It can also be built without JIT support by removing the --opt=jit option. Build time will be shorter, and the resulting executable smaller.

Note that RPython is a dialect of python2, and accordingly the version of python/pypy used for the build must be 2.7. If python2 is no longer available for your system, it may be easiest to use a pre-built pypy2.7: https://www.pypy.org/download.html

The interpreter differs from the reference implementation on the following points:

  • Division

    This result is stored internally as an arbitrary precision rational. When displayed, if the value is integer it will be displayed as such, otherwise as a float. This allows for arbitrary precision arithmetic without removing floating point division.

  • Stack Operations

    • { and }

      With zero items on the stack these will have no effect, rather than crashing.