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barebones bytecode interpreter in C
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README.md

Creole is a bytecode designed for simple implementations.

Bytecode Format

Each creole line consists of pseudo-UTF-8 characters. The first byte is an unsigned number between 0 and 127 (the high bit is clear). Each suceeding pseudo-UTF-8 character is encoded as follows:

  • 110HHHHx 10xxxxxx
  • 1110HHHH 10xxxxxx 10xxxxxx
  • 11110HHH 10Hxxxxx 10xxxxxx 10xxxxxx
  • 111110HH 10HHxxxx 10xxxxxx 10xxxxxx 10xxxxxx
  • 1111110H 10HHHxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
  • 11111110 10HHHHxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx

The first four bytes determine the type:

  • 0: Value is a register.
  • 1: Value is immediate.

All other values are reserved. Overlong values are allowed, and for some argument values they are necessary. All lines are terminated by a byte of all zeros.