subleq
lbForth
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| subleq | lbForth | |
|---|---|---|
| 9 | 3 | |
| 52 | 398 | |
| - | - | |
| 4.8 | 0.0 | |
| 8 days ago | about 1 year ago | |
| Forth | Forth | |
| The Unlicense | GNU General Public License v3.0 only |
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subleq
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The ancient world before computers had stacks or heaps
I wrote a Forth interpreter for a SUBLEQ machine (https://github.com/howerj/subleq), and for a bit-serial machine (https://github.com/howerj/bit-serial), both of which do not have a function call stack which is a requirement of Forth. SUBLEQ also does not allow indirect loading and stores as well and requires self-modifying code to do anything non-trivial. The approach I took for both machines was to build a virtual machine that could do those things, along with cooperative multithreading. The heap, if required, is written in Forth, along with a floating point word-set (various MCUs not having instructions for floating point numbers is still fairly common, and can be implemented as calls to software functions that implement them instead).
I would imagine that other compilers took a similar approach which wasn't mentioned.
- Show HN: Computing with just one instruction – Forth on SUBLEQ
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SUBLEQ eForth book
I've already posted about the implementation on Forth, but you might want to see how such a system is created in detail along with the design decisions and compromises. The source code can be freely viewed at https://github.com/howerj/subleq.
- Show HN: A single instruction computer running Forth
- Forth on a SUBLEQ (A One Instruction Set Computer)
- Forth Running on a One Instruction Set Computer
- Computing with Just One Instruction
lbForth
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What's the simplest language to implement?
Forth compiler in 159 lines of Lisp and C
- lbForth: A self-hosting metacompiled Forth
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Forth on the XMOS CPU?
Probably what I would do is write a minimal forth interpreter in C, and then use that and a few core words to bootstrap the rest of the system. It is a bit more complex than that, but here is the software which does it.https://github.com/larsbrinkhoff/lbForth
What are some alternatives?
swapforth - Swapforth is a cross-platform ANS Forth
xxdp - XXDP was, and remains, the PDP-11 diagnostic operating system. This project attempts to recover XXDP sources and documents.
Mako - A simple virtual game console
durexforth - Modern C64 Forth
zeptoforth - A not-so-small Forth for Cortex-M
TclForth - Multi-platform desktop Forth based on Tcl/Tk
elfort - A Forth metacompiler that directly emits an executable binary for x86-64 Linux written in Arkam
jonesforth_riscv - Jonesforth RISC-V port.
reko - Reko is a binary decompiler.
arkam - A Simple Stack VM and Forth
cc64 - cc64 is a small-C compiler written in Forth, hosted on the Commodore C64, Plus4 and C16 with 64k, and on the Commander X16. It is targeting the 6502 CPU.