linuskmr / intcode-go

An Intcode interpreter for Advent of Code 2019

intcode

Usage

intcode <flags> <path>

Intcode Language Specifications

Opcodes

The Opcodes 01-09 and 99 are defined in Advent of Code 2019.

The Opcodes 10-19 and 80 are an extension by me.

Opcode	Params	Description
01	3	first arg + second arg = third arg
02	3	first arg * second arg = third arg
03	1	Inputs an integer and stores it in the first arg
04	1	Outputs the first arg
05	2	If the first arg is non-zero, sets the instruction pointer to the second arg
06	2	If the first arg is zero, sets the instruction pointer to the second arg.
07	3	If the first arg is less than the second argument, sets the third arg to 1. If not less, sets it to 0
08	3	If the first arg is equal to the second argument, sets the third arg to 1. If not equal, sets it to 0
09	1	Adds the first arg to the relative base register
—	—	Additional section below
10	3	Bitwise AND: first arg & second arg = third arg
11	3	Bitwise OR: first arg | second arg = third arg
12	3	Bitwise XOR: first arg ^ second arg = third arg
13	3	Integer Division: first arg / second arg = third arg
14	3	Modulo: first arg % second arg = third arg
15	3	Left shift: first arg << second arg = third arg
16	3	Right shift: first arg >> second arg = third arg
17	3	Negate: If first arg is 0, return 1. Otherwise return 0
18	3	Unix Timestamp: Sets the first arg to the current unix timestamp
19	3	Random: Sets the first arg to a random positive number
80	3	Future: Syscall: Perform a syscall with eax=first arg, ebx=second arg, ecx=third arg
99	0	Ends the program

From esolangs.org/wiki/Intcode

Parameter Modes

Mode	Name	Description
0	Position Mode	The parameter is the address of the value.
1	Immediate Mode	The parameter is the value itself (Not used for writing).
2	Relative Mode	The parameter is added to the relative base register, which results in the memory address of the value.

From esolangs.org/wiki/Intcode

ABCDE
 1002

DE - two-digit opcode,      02 == opcode 2
 C - mode of 1st parameter,  0 == position mode
 B - mode of 2nd parameter,  1 == immediate mode
 A - mode of 3rd parameter,  0 == position mode,
                                  omitted due to being a leading zero

From adventofcode.com/2019/day/5

Examples

1, 3, 4, 2, 99