S32021

Register based virtual machine (vm) implemented in Python 3.

Usage

python fhvm.py <filename>

Optional arguments

To specify the amount of virtual memory, use --registers N

Maximum program size --maxprogram N

Opcodes

X - value

P - program

R - register

I/O

Load integer X into register R

LOAD X R

Prints the value stored in R

PRINT R

Load integer X into register pointed by R

LOADP X R

Prints the value stored in register pointed by R

PRINTP R

Inputs integer into R

INPUT R

Inputs integer to register pointed by R

INPUTP R

Copies the value from R1 to R2

COPY R1 R2

Arithmetic

Increments R by 1

INC R

Stores R1+R2 into R3

ADD R1 R2 R3

Stores R1-R2 into R3

SUB R1 R2 R3

Stores R1*R2 into R3

MUL R1 R2 R3

Stores R1//R2 into R3

DIV R1 R2 R3

Jumps

Sets program pointer to P if R1 > R2

GOG P R1 R2

Sets program pointer to P if R1 < R2

GOL P R1 R2

Sets program pointer to P if R1 = R2

GOE P R1 R2

Sets program pointer to P

GOTO P

Halt & other

Halts the program

HALT

Modifies the program instruction to X

META P X

Does nothing

NOP