1 unstable release
| 0.1.0 | Mar 3, 2024 |
|---|
#42 in #asm
1MB
447 lines
Contains (ELF exe/lib, 4MB) stack_machine
Concept
Pure stack machine. Small number of instructions. There are currently 20 instructions.
Usage
cargo build --release
cp target/release/stack_machine stack_machine
./stack_machine <path>
instructions
| Code | Instruction | Pop | Top | Push | Description |
|---|---|---|---|---|---|
| 0 | load |
- | - | value |
loads literal value |
| 1 | add |
a, b |
- | result |
result = a + b |
| 2 | sub |
b, a |
- | result |
result = a - b |
| 3 | mul |
a, b |
- | result |
result = a * b |
| 4 | div |
b, a |
- | result |
result = a / b |
| 5 | read |
mode |
- | input |
reads char (mode = 0) or string (mode = 1) from stdin |
| 6 | put |
format |
value |
- | prints value to stdout as a number (format = 0), char (format = 1) or bits (format = 2) |
| 7 | and |
a, b |
- | result |
result = a & b |
| 8 | or |
a, b |
- | result |
result = a | b |
| 9 | xor |
a, b |
- | result |
result = a ^ b |
| 10 | not |
value |
- | result |
result = !value |
| 11 | cmp |
b |
a |
result |
if a > b: result = 1 else if a < b: result = 2 else result = 0 |
| 12 | jmp |
- | - | - | jumps to #label |
| 13 | jeq |
value |
- | - | jumps to #label if value = 0 |
| 14 | jne |
value |
- | - | jumps to #label if value != 0 |
| 15 | jgr |
value |
- | - | jumps to #label if value = 1 |
| 16 | jle |
value |
- | - | jumps to #label if value = 2 |
| 17 | copy |
- | value |
value |
makes copy of value |
| 18 | drop |
value |
- | - | just drops value |
| 19 | halt |
- | - | - | stops executing |
Examples
2 + 2
#start ; '#start' label is required
load 2 ; stack = [2]
load 2 ; stack = [2, 2]
add ; stack = [4]
2 + 2 + 2
#start
load 2 ; stack = [2]
load 2 ; stack = [2, 2]
add ; stack = [4]
load 2 ; stack = [4, 2]
add ; stack = [6]
infinite loop
#start
jmp #start
condition
#equal
load "e"
load 1
put
halt
#notequal
load "n"
load 1
put
halt
#start ; program starts here!
load 2
load 1
cmp
jeq #equal
jmp #notequal ; jumps to '#notequal' because 2 != 1
TODO
Add more instructions.