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An interpreter for the FALSE language, possibly the fastest in the world.

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rfalse

An interpreter for the FALSE language — possibly the fastest in the world.

  • Supports all language features;
  • Written in Rust;
  • Up to 38 times more performant than false-js (see benchmarks below). If you are aware of any faster implementations, please let me know!

Table of Contents

Benchmarks

Test false-js rfalse difference
Primes, n=1999 4392 ms 168 ms ~26x
Fibonacci, n=33 37597 ms 987 ms ~38x
Fibonacci, n=25 802 ms 21 ms ~38x

Experimental VM:

Test rfalse-vm2 false-js solkin/false-vm
Primes, n=1999 102 ms 4392 ms (~43x slower) 154 ms (~1.5x slower)
Fibonacci, n=33 435 ms 37597 ms (~86x slower) 504 ms (~1.16x slower)
Fibonacci, n=25 9 ms 802 ms (~89x slower) 11 ms (~1.2x slower)

How to run

cargo run --release -- examples/hello.false

In no filename is given, stdin will be used instead.

WASM support

Experimental feature. WASM performance is about 2x worse than native build.

First, compile the WASM files:

wasm-pack build --release --target web

After that, run a webserver. For example:

python3 -m http.server 8000 -d .

Navigate to http://localhost:8000 and open the console.

Hacking

Run linter:

cargo clippy

Run tests:

cargo test

Run benchmarks:

cargo bench --bench perf

License

GNU LGPL v3

See also

Other notable implementations:

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