This is an implementation of forth written in C, as a hobby project to learn about forth. Jonesforth has been used as the biggest reference. A few starting goals about this project:
- easy to target on multiple (modern) architectures without much focus on being portable to several compilers (gcc is assumed)
- embeddable in other code, including on microcontrollers
- readability, however if someone studies this to learn about forth, jonesforth.S familiariaty is assumed
This forth is implementating what is normally called a Direct threaded code.
Note that this is probably not doing anything too differently from another implementation of a forth in C. Originally the goal was to implement this in a way that makes it portable, while also be able to sandbox it. During the implementation, the sandboxing aspect was basically dropped and maybe I'll try re-implementing it in a way that allows this. That kind of implementation probably requires either an emulator of a CPU, or a small CPU like virtual machine, and the forth targetting the CPU, something for another time.
$ make
$ ./build/emforthThere is a test.forth file which contains the implementation of basic
control flow words if/then/else and a test word. This is just for demoing
the capability, but a more feature-full init.forth is WIP.
$ make && ./build/emforth <test.forth
make: Nothing to be done for 'all'.
emForth initialized
: print-if-true 0branch 96 lit 65 emit lit 13 emit lit 10 emit branch 80 lit 66 emit lit 13 emit lit 10 emit lit 67 emit lit 13 emit lit 10 emit ;
STACK >
A
C
STACK >
B
C
STACK >
Error or EOF. Exiting.