The PL/0 virtual machine is a stack based execution environment. It starts executing at offset 0, and stops executing when the offset becomes invalid, typically using the HALT opcode.
Example
In this example, we demonstrate assembling some code to print the number 25, and then we feed this directly to the virtual machine for execution.
-- Generate some machine code to print out the number 25
$ echo "PUSH 25 PRINT" | ./pl0_assembler.py
[10, 25, 50]
-- Execute the machine code
$ echo "[10, 25, 50]" | ./pl0_machine.py
25
-- Machine State --
Sequence: [10, 25, 50]
Stack: [25]
Offset: 3