another stack machine
The program requires a reasonably up-to-date version of g++ to build, such that it supports the commandline option -std=gnu++20. Development is done on WSL Ubuntu 22.04 with GCC 11.4.0, and it should work on anything newer as well. It requires GNU extensions, specifically ranged switch-case (e.g. in case 0x20 ... 0x2e79:), to avoid having to use convoluted if-statements; this can easily be changed if necessary.
It has only one external dependency in the form of Nemanja Trifunović's utfcpp library, which is bundled with the code.
To build, execute ./build.sh; the interpreter can be built in release (default or -r) or debug (-d) mode, which enables logging of individual commands and dumping the whole stack at end of execution.
This is currently a command-line utility consisting of the calling shell-code and the interpreter. To use it, either simply invoke the filename (for example, a.out) in which case it will execute a hardcoded demo fibonacci program, or additionally supply it with an input file (for example, a.out ./samples/fib.cjk) to interpret it as source.
It currently doesn't support any option flags.
The shellcode sets up the program source and handles invocation of the interpreter machine object.
The interpreter takes a string (cstr or std::string, or std::string_view) containing instructions, then lexes it into a vector of commands, and then executes commands from that array. The command tape wraps around: executing past the final instruction returns the pointer to the start of the vector, providing mechanics for an infinite loop.