Register Machine Interpreter and Packer

Register machine interpreter written in C.
Register machines and packed integer form are implemented as described here.

Compiling

Can be compiled with make. You might have to change the compiler in Makefile.

Running

Interpreter

interpreter reads a program from stdin, and takes initial register values as arguments.

For example, cat add.r | ./interpreter 0 7 8, will run a register machine that computes R0=R1+R2=7+8.

Packer

packer [-p|-u] packs or unpacks a program from stdin and outputs the result. -p converts from a normal program to a packed integer. -u converts from a packed integer into a program.

For example, cat add.r | ./packer -p will convert the add program into an integer representation of it.
cat add.r | ./packer -p | ./packer -u | ./interpreter 0 81 129 will convert add to an integer and back again, then run the program.

Register Machine Programs

The syntax of register programs is from here. Thank you 🙂

Each line of a file must be in one of the following formats:

1. HALT will stop the program
2. INC REGISTER NEXT_LABEL will increment REGISTER and jump to NEXT_LABEL
3. DEC REGISTER LABEL_1 LABEL_2 will decrement REGISTER and jump to LABEL_1 if REGISTER is greater than zero, otherwise it will jump to LABEL_2

REGISTER, NEXT_LABEL, LABEL_1, and LABEL_2 must be nonnegative integers.

The first line of the file is L0 in the register machine, the second line is L1, and so on.