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use crate::vm_error;
use crate::{
runtime_error::{KabelRuntimeError, RuntimeErrorKind},
vm_boolean_comparison, vm_boolean_equality,
};
#[derive(Debug, Clone)]
pub struct Unit {
pub code: Vec<u8>,
pub pool: Vec<Value>,
pub lines: Vec<(usize, usize)>, // line #, repeats number of instructions
}
impl Unit {
pub fn new(code: Vec<u8>, pool: Vec<Value>, lines: Vec<(usize, usize)>) -> Self {
Self { code, pool, lines }
}
pub fn new_empty() -> Self {
Self {
code: Vec::new(),
pool: Vec::new(),
lines: Vec::new(),
}
}
}
#[derive(Clone)]
pub struct VM {
pub ip: usize,
pub unit_ptr: usize,
pub call_stack: Vec<(usize, usize, usize)>, // (unit_ptr, ip, stack_offset)
pub units: Vec<Unit>,
pub stack: Vec<Value>,
pub variables: Vec<Value>,
pub variables_offset: usize,
text: Vec<String>,
}
impl VM {
pub fn new(
bytecode: Vec<u8>,
lines: Vec<(usize, usize)>,
pool: Vec<Value>,
text: String,
) -> Self {
Self {
ip: 0,
unit_ptr: 0,
call_stack: vec![(0, 0, 0)],
units: vec![Unit::new(bytecode, pool, lines)],
stack: Vec::new(),
variables: Vec::new(),
variables_offset: 0,
text: text.lines().map(|s| s.to_string()).collect::<Vec<String>>(),
}
}
pub fn run(&mut self, output: &mut String) -> Result<(), KabelRuntimeError> {
use Value::*;
while self.ip < self.units[self.unit_ptr].code.len() {
match self.read() {
0x00 => {
// LOAD
let byte = self.read() as usize;
println!("ip: {}", self.ip);
let value = self.units[self.unit_ptr].pool[byte].clone();
self.stack.push(value);
}
0x01 => {
// VAR
let ptr = self.read() as usize;
let value = self.variables[ptr + self.variables_offset].clone();
self.stack.push(value);
}
0x02 => {
// REF
let ptr = self.read() as usize;
self.stack.push(Ref(ptr));
}
0x03 => {
// ASN
let value = self.stack.pop().unwrap();
let ptr = self.read();
let offset = self.call_stack.last().expect("var call stack last").2;
self.variables[ptr as usize + offset] = value.clone();
self.stack.push(value);
}
0x04 => {
// ASNARR
let listref = self.stack.pop().unwrap();
let index = self.stack.pop().unwrap();
let value = self.stack.pop().unwrap();
if let Value::Num(index) = index {
if index.fract() != 0.0 {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Subscript index must be an integer but found {}",
index
));
}
let index = index as usize;
if let Value::Ref(listref) = listref {
let list = &mut self.variables[listref];
if let Value::List(ref mut list) = list {
let len = list.len();
if index > len {
return Err(vm_error!(
self,
RuntimeErrorKind::ArrayOutOfBounds,
"List length is {} but found index {}",
len,
index
));
}
println!("index: {}", index);
list[index] = value.clone();
self.stack.push(value);
} else {
let type_str = list.type_str();
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to subscript non-list type {}",
type_str
));
}
} else {
panic!("Something went wrong in kabel, listref was not a Ref");
}
} else {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to use non-integer type {} to subscript list",
index.type_str()
));
}
}
0x05 => {
// DECL
let value = self.stack.pop().unwrap();
self.variables.push(value);
}
0x06 => {
// ADD
match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(v1), Num(v2)) => self.stack.push(Num(v1 + v2)),
(Str(v1), Str(v2)) => {
self.stack.push(Str(v1.clone() + &v2));
}
(Bool(_v1), Bool(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot add booleans"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
}
}
0x07 => {
// SUB
match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(v1), Num(v2)) => self.stack.push(Num(v1 - v2)),
(Str(_v1), Str(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot subtract strings"
))
}
(Bool(_v1), Bool(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot subtract booleans"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
}
}
0x08 => {
// MUL
match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(v1), Num(v2)) => self.stack.push(Num(v1 * v2)),
(Str(v1), Num(v2)) => {
if v2.fract() == 0.0 {
self.stack.push(Str(v1.repeat(v2 as usize)));
} else {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Number must be an integer"
));
}
}
(Str(_v1), Str(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot multiply strings"
))
}
(Bool(_v1), Bool(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot multiply booleans"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
}
}
0x09 => {
// DIV
match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(v1), Num(v2)) => self.stack.push(Num(v1 / v2)),
(Str(_v1), Str(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot divide strings"
))
}
(Bool(_v1), Bool(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot divide booleans"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
}
}
0x0A => {
// MOD
match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(v1), Num(v2)) => self.stack.push(Num(v1 % v2)),
(Str(_v1), Str(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform modulus on strings"
))
}
(Bool(_v1), Bool(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform modulus on booleans"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
}
}
0x0B => {
// BITAND
match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(v1), Num(v2)) => {
if v1.fract() != 0.0 {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise AND on {}",
v1
));
}
if v2.fract() != 0.0 {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise AND on {}",
v2
));
}
self.stack.push(Num((v1 as u32 & v2 as u32) as f32))
}
(Str(_v1), Str(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise AND on strings"
))
}
(Bool(_v1), Bool(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise AND on booleans"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
}
}
0x0C => {
// BITXOR
match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(v1), Num(v2)) => {
if v1.fract() != 0.0 {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise XOR on {}",
v1
));
}
if v2.fract() != 0.0 {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise XOR on {}",
v2
));
}
self.stack.push(Num((v1 as u32 ^ v2 as u32) as f32))
}
(Str(_v1), Str(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise XOR on strings"
))
}
(Bool(_v1), Bool(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise XOR on booleans"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
}
}
0x0D => {
// BITOR
match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(v1), Num(v2)) => {
if v1.fract() != 0.0 {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise OR on {}",
v1
));
}
if v2.fract() != 0.0 {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise OR on {}",
v2
));
}
self.stack.push(Num((v1 as u32 | v2 as u32) as f32))
}
(Str(_v1), Str(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise OR on strings"
))
}
(Bool(_v1), Bool(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Cannot perform bitwise OR on booleans"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
}
}
// EQ
0x0E => vm_boolean_equality!(self, ==),
// NE
0x0F => vm_boolean_equality!(self, !=),
// GR
0x10 => vm_boolean_comparison!(self, >),
// GE
0x11 => vm_boolean_comparison!(self, >=),
// LS
0x12 => vm_boolean_comparison!(self, <),
// LE
0x13 => vm_boolean_comparison!(self, <=),
// OR
0x14 => match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(_v1), Num(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"||\" on non-boolean numbers"
))
}
(Str(_v1), Str(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"||\" on non-boolean strings"
))
}
(Bool(v1), Bool(v2)) => self.stack.push(Bool(v1 || v2)),
(Null, _) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"||\" on non-boolean value null"
))
}
(_, Null) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"||\" on non-boolean value null"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
},
// AND
0x15 => match (self.stack.pop().unwrap(), self.stack.pop().unwrap()) {
(Num(_v1), Num(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"&&\" on non-boolean numbers"
))
}
(Str(_v1), Str(_v2)) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"&&\" on non-boolean strings"
))
}
(Bool(v1), Bool(v2)) => self.stack.push(Bool(v1 && v2)),
(Null, _) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"&&\" on non-boolean value null"
))
}
(_, Null) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"&&\" on non-boolean value null"
))
}
(v1, v2) => {
return Err(vm_error!(
self,
RuntimeErrorKind::MismatchedTypes,
"Mismatched types: {} and {}",
v1.type_str(),
v2.type_str()
))
}
},
// NOT
0x16 => match self.stack.pop().unwrap() {
Null => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"!\" on non-boolean value null"
))
}
Num(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"!\" on non-boolean number"
))
}
Str(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"!\" on non-boolean string"
))
}
Bool(v1) => self.stack.push(Bool(!v1)),
List(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"!\" on non-boolean list"
))
}
Fun(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"!\" on non-boolean function"
))
}
Ref(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"!\" on non-boolean reference"
))
}
},
// NEG
0x17 => match self.stack.pop().unwrap() {
Null => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"-\" on non-number value null"
))
}
Num(v1) => self.stack.push(Num(-v1)),
Str(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"-\" on non-number string"
))
}
Bool(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"-\" on non-number boolean"
))
}
List(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"!\" on non-number list"
))
}
Fun(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"-\" on non-number function"
))
}
Ref(_v1) => {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to perform \"-\" on non-number reference"
))
}
},
// JMP
0x18 => {
let loc = self.read_u16();
self.ip += loc as usize;
}
// JMP_UP
0x19 => {
let loc = self.read_u16();
self.ip -= loc as usize;
}
// JNE
0x1A => {
let condition = self.stack.pop().unwrap();
if let Value::Bool(condition) = condition {
if !condition {
let loc = self.read_u16();
self.ip += loc as usize;
} else {
self.read_u16();
}
} else {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"if must have condition of type boolean"
));
}
}
// CALL
0x1B => {
let num_args = self.read();
let function = self.stack.pop().expect("Stack was empty in call");
if let Value::Fun(function) = function {
if num_args as usize != function.arity {
return Err(vm_error!(
self,
RuntimeErrorKind::IncorrectArity,
"Function has {} arguments, {} provided",
function.arity,
num_args
));
}
self.variables_offset = self.stack.len() - num_args as usize;
self.call_stack
.push((self.unit_ptr, self.ip, self.variables_offset));
self.stack
.insert(self.stack.len() - num_args as usize, Value::Fun(function));
self.ip = 0;
self.unit_ptr = function.unit_ptr as usize;
} else {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to call non-function type {}",
function.type_str()
));
}
}
// RET
0x1C => {
let (unit_ptr, ip, variables_offset) =
self.call_stack.pop().expect("Call stack empty on RET");
let ret = self.stack.pop().expect("Missing return value");
self.stack = self.stack[..variables_offset].to_vec();
self.variables_offset = self.call_stack.last().expect("call stack empty").2;
self.unit_ptr = unit_ptr;
self.ip = ip;
// returned to code
self.stack.push(ret);
}
// LIST
0x1D => {
let len = self.read();
let list = self
.stack
.drain(self.stack.len() - len as usize..)
.collect();
self.stack.push(Value::List(list));
}
// SCR
0x1E => {
let index = self.stack.pop().expect("stack empty on subscript index");
let list = self.stack.pop().expect("stack empty on subscript list");
if let Value::Num(index) = index {
if index.fract() != 0.0 {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Subscript index must be an integer but found {}",
index
));
}
let index = index as usize;
if let Value::List(list) = list {
if index > list.len() {
return Err(vm_error!(
self,
RuntimeErrorKind::ArrayOutOfBounds,
"List length is {} but found index {}",
list.len(),
index
));
}
self.stack.push(list[index].clone());
} else {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to subscript non-list type {}",
list.type_str()
));
}
} else {
return Err(vm_error!(
self,
RuntimeErrorKind::WrongType,
"Tried to use non-integer type {} to subscript list",
index.type_str()
));
}
}
0xFD => {
// POP
let times = self.read();
for _ in 0..times {
self.stack
.pop()
.expect(&format!("{}: Unable to pop stack", self.ip));
}
}
0xFE => {
// PRINT
let value = self.stack.pop().unwrap();
/*match value {
Null => *output += "null",
Num(v) => *output += &v.to_string(),
Str(v) => *output += &v,
Bool(v) => *output += &v.to_string(),
List(v) => {
*output += "[";
for value in v {
*output += &format!("", value);
}
*output += "[";
}
Fun(v) => *output += &format!("<function {}>", v.unit_ptr),
}*/
*output += &value.to_string();
*output += "\n";
}
_ => {}
}
}
Ok(())
}
pub fn read(&mut self) -> u8 {
let byte = self.units[self.unit_ptr].code[self.ip];
self.ip += 1;
byte
}
pub fn read_u16(&mut self) -> u16 {
let byte_one = (self.units[self.unit_ptr].code[self.ip] as u16) << 0x08;
self.ip += 1;
let byte_two = self.units[self.unit_ptr].code[self.ip] as u16;
self.ip += 1;
byte_one | byte_two
}
pub fn find_line(&self) -> usize {
// returns line # at ip
let mut line_ip = 0;
for (line, rep) in self.units[self.unit_ptr].lines.clone() {
if line_ip + rep > self.ip {
return line;
}
line_ip += rep;
}
panic!("Something went wrong in finding line for error")
}
}
#[derive(Debug, Clone)]
pub enum Value {
Null,
Num(f32),
Str(String),
Bool(bool),
List(Vec<Value>),
Fun(Function),
Ref(usize),
}
impl Value {
pub fn type_str(&self) -> String {
match self {
Value::Null => "null".to_string(),
Value::Num(_) => "number".to_string(),
Value::Str(_) => "string".to_string(),
Value::Bool(_) => "bool".to_string(),
Value::List(_) => "list".to_string(),
Value::Fun(_) => "function".to_string(),
Value::Ref(_) => "reference".to_string(),
}
}
}
impl ToString for Value {
fn to_string(&self) -> String {
use Value::*;
match self {
Null => "null".to_string(),
Num(v) => v.to_string(),
Str(v) => v.to_string(),
Bool(v) => v.to_string(),
List(v) => {
let mut output = "".to_string();
output += "[";
for value in <Vec<Value>>::clone(&v).into_iter() {
output += &value.to_string();
output += ",";
}
output += "]";
output
}
Fun(v) => format!("<function {}>", v.unit_ptr),
Ref(v) => format!("<reference {}>", v),
}
}
}
#[derive(Debug, Clone, Copy)]
pub struct Function {
pub unit_ptr: usize,
pub arity: usize,
}