Refactor operand encoding and decoding

marekjm commented 8 years ago

Viua needs to encode and decode several operand types. Actual encoding is based on CBOR with some notable exceptions:

major types 4 (arrays) and 5 (maps) are not implemented as operands are simple types
major type 6 is not implemented as Viua has a defined set of operand types
major type 2 (byte string) is not implemented
major type 3 (UTF-8 text string) is implemented supporting only ASCII printable characters subset of UTF-8 (to be fixed later)

Unimplemented types cause the VM to emit a user-servicable exception signalling corrupted program text.

Register indexes are encoded as major type 0 (unsigned integers). Program symbols (type, function and block names, etc.) are encoded as major type 3 (text string).

marekjm commented 8 years ago

More information about CBOR: http://cbor.io/ and https://tools.ietf.org/html/rfc7049

marekjm commented 7 years ago

Partially implemented. Operand type is encoded in bytecode, and it is used during decoding stage.

marekjm / viuavm

Refactor operand encoding and decoding #152