This is an Odin port of the clox vm from Robert Nystroms book "Crafting Interpreters".

Additions over the original vm.

This implementation comes with a few additions over the original clox vm, these include:

Run-Length-Encoding of bytecode line numbers to improve memory usage
Support for more than 255 constants per chunk, while keeping backwards compatibility in performance for single byte constant instructions
Support for Values as keys in hash tables
Switch Statements
Break Statements to break out of loops
Final keyword, which gets checked at compile time
Improved performance of garbage collection.

Testing

This project includes an extensive test suite and a test runner written in c++, which can be found in test/test.cpp. To use it compile the test runner (c++ version 17+) and pass it the path to the compiled compiler/vm.

Running the vm

Requirements

Requires an Odin compiler.

odin build src -out=olox

compiling & running a source file

./olox <srcfile>.lox

running in REPL mode (read evaluate print loop)

./olox