MoarVM Source Code
MoarVM is written in C, and is designed to (eventually) have a couple of build targets: a dynamic library (so it can be loaded by other VMs or programs that embed it) with a small executable front-end wrapper, but also a fully statically-built standalone executable that can run .moarvm files only. Another option could be for incorporating programs (such as a perl6 build) to statically link the moar library so it can be self-contained itself.
moar.c will contain the main embedding API, and main.c will utilize that API. This is not yet fully realized. It will eventually be compiled to libmoar, or similar.
moar.h is the primary header file that embedders should include to gain access to the publicly exported MVM_ routines and macros. It includes all the other .h in the src/ tree. Some individual .c files also include other .h files, but the symbols from those files aren't necessarily intended to be part of MoarVM's public API.
main.c is currently compiled to the ./moar executable, which is able to run or dump .moarvm bytecode files only. Use the --help flag to see the options available to the moar (moar.exe on Windows) executable.