1. ECE243
Interpreter Lab

2. Interpreter Lab You write an interpreter EXAMPLE MINI PROGRAM: Clear
for a simple accumulator-based virtual ISA
ie, a program that executes a simple program
an accumulator is just a memory location
EXAMPLE MINI PROGRAM:
Clear
Add 77
Sub 15
Exit

3. Interpreter in Memory Addr Value 0x20000 mini program … 0x25000
accumulator
0x30000
your interpreter
mini insts, like java bytecode
1 word
nios program, like java virtual machine (JVM)

4. HOW EACH MINI INST IS ENCODED:
4 byte opcode
0=clear, 1=add, 2=sub, 3=exit
4 byte operand
if appropriate
4 byte address of next instruction

5. Example 0x20000 0x20004 Memory: 0x20008 0x2000c 0x20010 0x22014
DESIRED MINIPROGRAM
Clear
Add 77
Sub 15
Exit
ASSEMBLY FILE (ENCODED)
Memory:
0x20000
0x20004
0x20008
0x2000c
0x20010
0x22014
0x22018
0x2201c
0x22100 .