What is this?

An interpreter of a very simple instruction set I made up. Instructions are run on a virtual machine that exists within the Python runtime.

Usage

python lc1.py <sourcefile.lc1> 

Virtual Machine Info

There are 8 general purpose 16 bit registers r0 through r7.

Syntax for LC1

<mnemonic> <arg1> <arg2> ... <argn> ; <comment>

• arguments are separated by spaces
• everything is case insensitive
• non-negative decimal and hexadecimal numbers are valid
• hexadecimal numbers are denoted by perpending an '0x' to the number as in 0xF = 15 in base 10
• comments, whitespace, and blank lines are ignored during interpretation

Instruction Set

MOV <register1:int> <register2>

   MOV r1 r2  ; set r2 to value of r1
   MOV 5 r2   ; set r2 to 5

ADD <register1:int1> <register2:int2> <register3>

   ADD r1 0xF r3 ; add 15 to value of r1 and store it in r3
   ADD r1 r2 r3  ; add value of r1 to value of r2 and store it in r3

NOT <register1:int> <register2>

   NOT r0 r1  ; invert bits of r0 and store result in r1
   NOT 0x5 r0 ; invert bits representing 5 and store result in r0

AND <register1:int1> <register2:int2> <register3>
   
   AND r0 r1 r2 ; bitwise and of r0 and r1, store result in r2

DSP <register:int>
   
   DSP 65 ; write ascii value to stdout, this outputs 'A'

PRINT <register:int>
   
   PRINT 20 ; prints hexadecimal value of r0 to screen, this outputs '0x14'