A stack-based language implemented in RISC-V assembly.

• Edit config.mk to suit your environment
• make to build the program

With the default config this should end a message like:

* Build complete: build/fiveth

The default configuration is to run an interactive Fiveth shell that works under a 64-bit RISC-V Linux environment. You can now:

• make qemu to run it in QEMU user-mode emulation
• make run to run it directly, if you are actually on RISC-V

Try typing some simple Fiveth programs. Outputs are shown after a semicolon.

0 > 1 2 + .  ; 3
0 > 10 [ . ] count  ; 0 1 2 3 4 5 6 7 8 9
0 > "Hello, world!" s.  ; Hello, world!

Press Ctrl-D to quit. docs/shell.md has more details on running and using the Fiveth interactive shell.

On Ubuntu 22.04:

# apt install qemu-user make
# # If using GNU toolchain
# apt install gcc-riscv64-linux-gnu
# # If using LLVM toolchain
# apt install clang lld

If you have Nix, you can try to use the provided shell.nix or flake.nix.

On other systems, you can try to acquire a LLVM toolchain or a RISC-V toolchain, as well as GNU make. To run Fiveth in an emulator, qemu-riscv64 can be used to emulate a Linux binary but is only supported on Linux hosts.