aebytecode

An library and stand alone assembler for aeternity bytecode.

This version supports Aevm bytecode and Fate bytecode.

Build

$ make

Fate Code

Fate code exists in 3 formats:

1. Fate byte code. This format is under consensus.
2. Fate assembler. This is a text represenation of fate code. This is not under consensus and other implemenation and toolchains could have their own format.
3. Internal. This is an Erlang representation of fate code Used by this particular engin implementation.

This library handles all tree representations. The byte code format is described in a separate document. The internal format is described in a separate document. The text representation is described below.

Fate Assembler Code

Assembler code can be read from a file. The assembler has the following format:

Comments start with 2 semicolons and runs till end of line ;; This is a comment

Opcode mnemonics start with an upper case letter. DUP

Identifiers start with a lower case letter an_identifier

References to function arguments start with arg followed by an integer arg0

References to variables/registers start with var followed by an integer var0

References to stack postions is either a (for stack 0) or start with stack followed by an integer stack1 a

Immediate values can be of 9 types:

1. Integers as decimals: {Digits} or -{Digits} 42 -2374683271468723648732648736498712634876147 And integers as Hexadecimals:: 0x{Hexdigits} 0x0deadbeef0

2. addresses, a base58 encoded string starting with # followed by a number of base58chars #nv5B93FPzRHrGNmMdTDfGdd5xGZvep3MVSpJqzcQmMp59bBCv

3. Boolean true or false true false

4. Strings "{Characters}" "Hello"

5. Map { Key => Value } {} { 1 => { "foo" => true, "bar" => false}

6. Lists [ Elements ] [] [1, 2]

7. Bit field < Bits > or !< Bits > <000> <1010 1010> <> !<>

8. Tuples ( Elements ) () (1, "foo")

9. Variants: (| Size | Tag | ( Elements ) |) (| 42 | 12 | ( "foo", 12) |)

Where

Digits: [0123456789]

Hexdigits: [0123456789abcdef]

base58char: [123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz]

Characters: any printable ascii character 0..255 (except " no quoting yet)

Key: any value except for a map

Bits: 01 or space

Elements: Nothing or Value , Elements

Size: Digits (0 < Size < 256)

Tag: Digits (0 =< Tag < Size)