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use super::*;
pub struct Frame {
stack: Vec<Value>,
locals: Vec<Value>,
upvals: Vec<Rc<RefCell<Value>>>,
pc: usize,
}
impl Frame {
pub(super) fn new(
nlocals: usize,
bindings: Vec<Rc<RefCell<Value>>>,
nownedvars: usize,
) -> Self {
Self {
stack: vec![],
locals: {
let mut vec = Vec::new();
vec.resize_with(nlocals, || Value::Invalid);
vec
},
upvals: {
let mut vec = bindings;
vec.resize_with(vec.len() + nownedvars, || {
Rc::new(RefCell::new(Value::Invalid))
});
vec
},
pc: 0,
}
}
#[inline(always)]
pub(super) fn len(&mut self) -> usize {
self.stack.len()
}
#[inline(always)]
pub(super) fn pull(&mut self, pos: usize) {
let len = self.stack.len();
let x = self.stack.remove(len - 1 - pos);
self.stack.push(x);
}
#[inline(always)]
pub(super) fn unpull(&mut self, pos: usize) {
let x = self.stack.pop().unwrap();
let len = self.stack.len();
self.stack.insert(len - pos, x);
}
#[inline(always)]
pub(super) fn swap(&mut self, a: usize, b: usize) {
let len = self.stack.len();
self.stack.swap(len - 1 - a, len - 1 - b);
}
#[inline(always)]
pub(super) fn push(&mut self, value: Value) {
self.stack.push(value);
}
#[inline(always)]
pub(super) fn pop(&mut self) -> Value {
self.stack.pop().unwrap()
}
#[inline(always)]
pub(super) fn peek(&self) -> &Value {
self.stack.last().unwrap()
}
#[inline(always)]
pub(super) fn peekn(&self, n: usize) -> Vec<Value> {
let len = self.stack.len();
self.stack[len - n..].to_vec()
}
#[inline(always)]
pub(super) fn popn(&mut self, n: usize) -> Vec<Value> {
let len = self.stack.len();
self.stack.drain(len - n..).collect()
}
#[inline(always)]
pub(super) fn popn_iter<'a>(&'a mut self, n: usize) -> impl Iterator<Item = Value> + 'a {
let len = self.stack.len();
self.stack.drain(len - n..)
}
#[inline(always)]
pub(super) fn pushn<I: IntoIterator<Item = Value>>(&mut self, vec: I) {
self.stack.extend(vec);
}
#[inline(always)]
pub(super) fn setvar(&mut self, var: &Variable, value: Value) {
match var.type_() {
VariableType::Local => self.locals[var.slot()] = value,
VariableType::Upval => {
self.upvals[var.slot()].replace(value);
}
}
}
#[inline(always)]
pub(super) fn getcell(&self, slot: usize) -> Rc<RefCell<Value>> {
self.upvals[slot].clone()
}
#[inline(always)]
pub(super) fn getcells(&self) -> &Vec<Rc<RefCell<Value>>> {
&self.upvals
}
#[inline(always)]
pub(super) fn getcells_mut(&mut self) -> &mut Vec<Rc<RefCell<Value>>> {
&mut self.upvals
}
#[inline(always)]
pub(super) fn getvar(&self, var: &Variable) -> Result<Value> {
let value = match var.type_() {
VariableType::Local => self.locals[var.slot()].clone(),
VariableType::Upval => self.upvals[var.slot()].borrow().clone(),
};
if let Value::Invalid = value {
Err(rterr!("Variable {:?} used before being set", var.name()))
} else {
Ok(value)
}
}
#[inline(always)]
pub(super) fn delvar(&mut self, var: &Variable) -> Result<Value> {
let value = match var.type_() {
VariableType::Local => std::mem::replace(&mut self.locals[var.slot()], Value::Invalid),
VariableType::Upval => self.upvals[var.slot()].replace(Value::Invalid),
};
if let Value::Invalid = value {
Err(rterr!(
"Variable {:?} used before being set (for del)",
var.name()
))
} else {
Ok(value)
}
}
#[inline(always)]
pub(super) fn setargs(&mut self, params: &Vec<Variable>, args: Vec<Value>) {
assert_eq!(params.len(), args.len());
for (var, arg) in params.iter().zip(args) {
self.setvar(var, arg);
}
}
#[inline(always)]
pub(super) fn fetch<'a>(&mut self, code: &'a Code) -> (usize, Option<&'a Opcode>) {
let pc = self.pc;
let opc = code.ops().get(pc);
self.pc += 1;
(pc, opc)
}
#[inline(always)]
pub(super) fn jump(&mut self, pc: usize) {
self.pc = pc;
}
}