A configurable and small virtual machine which runs Erlang BEAM bytecode. Many simplifications have been made to keep code small at the cost of speed. The goal is to go smaller than several tens of kilobytes (oh well, under megabyte would be cool).

Features used in code can be configured at compile time when you want to squeeze VM into a particularly small platform.

C++ implementation of minimalistic BEAM virtual machine. Has simple configurable feature settings in include/g_FEATURES.h (like distribution, float, bignum support etc).

Requires CMake, Clang (probably will work with GCC too?).

Run make in emulator/ directory. CMakeLists.txt work with QtCreator as IDE not to mention cmake supporting host of other IDEs.

• Processes, heaps and stack (no GC yet)
• Reductions and scheduling
• Message passing and infinite receiving (no timers and timed receive yet)
• Some BIFs (ever growing amount)
• Many opcodes, BEAM file loading and code path search

• Exceptions
• Process links, monitors
• Simple GC
• Binaries
• Floats maybe?

Few apps which are currently out of use, but were created to help me learn BEAM universe: A simple beam-to-something-else assembler, a high level interpreter for GluonVM intermediate representation (IR), which simulates properties of Erlang VM (memory, instruction set, etc) and processes (registers, stack, process execution state).

apps/prototype is based on github.com/tonyrog/beam (owe a beer to Tony!).