wasmachine

Put WebAssembly in your washing machine

wasmachine is an implementation of the WebAssembly specification in a FPGA. It follows a sequential 6-steps design.

Currently it's in an initial state but is able to exec some basic commands.

Features

• Stack-based (calls, blocks and operands), variable-length CISC architecture following the WebAssembly spec design
• Implemented an "expanded" version of the binary format
  • Inlined destination of blocks and branches labels
  • Decoded LEB128 targets for br_table
• Strict type-checking on runtime
• Optionally disable floating point, memory and 64 bits operations at instance time to generate a simpler core for smaller FPGAs

Keynotes

• NodeJS Madrid (ad-hoc spontaneous keynote at end of the main one :-P)

Roadmap

1. Implement integer mathematical operations
2. Support for functions calling
3. Add a 64 bits FPU for the floating point operations
4. Memory-based operations
5. Modules loader in RAM
6. Replace usage of ROM for modules on RAM
7. Accept call of functions from outside
8. Use a pipelined design

External dependencies

• LEB128
• fpu

They can be automatically upgraded executing

make update-dependencies

Testing

If you want to test all the modules at once with all the features enabled (the default build configuration), simply exec:

make test

You can also test the modules disabling some features using the parameters argument, that will be directly passed to the iverilog executable:

make test parameters='-Pcpu_tb.HAS_FPU=0 -Pcpu_tb.USE_64B=0'