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lbForth

A self-hosting portable Forth

http://github.com/larsbrinkhoff/lbForth

Self-hosting

  • Rebuilds itself using a compiler written in Forth
  • Primitives written in assembly language
  • Assemblers written in Forth
  • Outputs a self-contained executable file

Portable

  • 64-bit, 32-bit, 16-bit
  • Little, big endian
  • x86, ARM, RISC-V, 68000, PDP-11, asm.js
  • Linux, Windows, Unix, TOS

Simplified

  • Based on 12 required primitives
  • Minimal kernel
  • Most of the system is loaded and compiled on startup

Small

  • Kernel: 800 lines
  • System: 600 lines
  • Compiler: 400 lines
  • Assembler: 300 lines

Bootstrapped

  • Bootstraps without any Forth
  • Compiler written in Lisp
  • Primitives written in C
  • Builds with C compiler

CONTEMPORARY

  • Subset of 1994 and 2012 standards
  • Builds with common tools
  • Available from GitHub
  • Built and tested in continuous integration services

RETRO

  • Atari ST
  • PDP-11 Unix
  • Block editor

CROSS COMPILER

  • Microcontrollers:
    AVR, PIC, MSP430, Thumb, STM8, 8051
  • Retro: 6502, PDP-8

UPCOMING

  • Microcontrollers: Xtensa
  • Retro: PDP-10, C64, Z80 CP/M, 6809, 1802
  • Optimizing compiler
  • Run inside Emacs

TRY IT