rtForth

Forth implemented in Rust, designed for real-time applications.

Documentation at rtForth Primer.

Design decisions:

• Safe first, performance later
• Token Threaded + Subroutine-threaded (only for x86)

Usage

Install Rust:

Installing Rust

After installation of Rust:

$ cargo build --example rf
$ ./target/debug/examples/rf --help         # Display help information.
$ ./target/debug/examples/rf <file>         # Load forth commands in <file>.
$ ./target/debug/examples/rf lib.fs <file>  # Load lib.fs before <file>.
$ cargo build --release --example rf        # Compile optimized token-threaded rtForth.
$ cargo build --example rf --release --features="subroutine-threaded"    # Compile optimized subroutine-threaded rtForth.

$ cargo run --example rf              # Execute debug version of rtForth.
rtForth v0.1.39, Copyright (C) 2017 Mapacode Inc.
Type 'bye' or press Ctrl-D to exit.
rf> : star 42 emit ;
 ok
rf> star
* ok
rf> star star star
*** ok
rf> bye

Benchmark 2018/08/24

• ACER ASPIRE
• 64-bit Ubuntu GNOME 16.04
• rustc 1.25.0-nightly (a0dcecff9 2018-01-24)
• old: rev 413b0c4 (2017/06/22)
• rtforth rev 413b0c4 (2017/06/22) token-threaded (token-x86-old)
• rtForth rev 413b0c4 (2017/06/22) subroutine-threaded (stc-x86-old)
• rtforth rev ead4a0 token-threaded rev (ttc-x86)
• rtForth rev ead4a0 subroutine-threaded stc-x86)
• SwiftForth 3.7.2
• gforth 0.7.2
• gforth-fast 0.7.2

SwiftForth vs gforth vs rtForth:

rtForth subroutine-threading vs token-threading: