A Rust port of my Python submission for http://redd.it/1kqxz9:

Tiny, a very simple fictional computer architecture, is programmed by an assembly language that has 16 mnemonics, with 37 unique op-codes. The system is based on Harvard architecture, and is very straight-forward: program memory is different from working memory, the machine only executes one instruction at a time, memory is an array of bytes from index 0 to index 255 (inclusive), and doesn't have any relative addressing modes.

Your goal will be to write an assembler for Tiny: though you don't need to simulate the code or machine components, you must take given assembly-language source code and produce a list of hex op-codes. You are essentially writing code that converts the lowest human-readable language to machine-readable language!

My original Python submission can be found here: https://github.com/msiemens/TINY.ASM/. This is a Rust port. It features a much better architecture, including a proper parser and abstract syntax tree. Like the Python version, this also comes with a small VM.

Run the assembler:

$ tiny asm <input>

Create a binary file that the VM can execute:

$ tiny asm --bin <input> <binary>

Run the VM:

$ tiny vm <binary>

 v--- operation
MOV [0] 1
     ^  ^---- literal
     |------- memory address

Comments

; This is a comment

Labels

label:
JMP :label

Constants

$mem_addr = [0]
$some_const = 5

MOV $mem_addr $some_const

Imports

#import file_name.asm

Char Constants

APRINT '!'  ; Prints: !
APRINT '\n' ; Prints a newline

Subroutines

; Define a subroutine
; name ----v              v---- number of arguments
@start(binary_shift_left, 1)
    ADD     $arg0       $arg0
    MOV     $return     $arg0
@end

; Call a subroutine
@call(binary_shift_left, 5)
@call(binary_shift_left, [5])

The MIT License (MIT)

Copyright (c) 2014 Markus Siemens

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.