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#![allow(dead_code)]
#![warn(
clippy::wildcard_imports,
clippy::string_add,
clippy::string_add_assign,
clippy::manual_ok_or,
unused_lifetimes
)]
pub mod native;
pub mod value;
pub mod vm;
use value::{Object, ObjectType};
use crate::value::Primitive;
pub use crate::vm::VM;
pub struct Chunk {
constants: Vec<Primitive>,
code: Vec<u8>,
}
const STACK_SIZE: usize = 1024;
#[derive(Debug)]
pub struct Stack {
top: usize,
stack: [Primitive; STACK_SIZE],
}
impl Default for Stack {
fn default() -> Self {
Self {
top: Default::default(),
stack: [Primitive::Empty; STACK_SIZE],
}
}
}
impl Stack {
#[inline(always)]
pub fn push(&mut self, value: Primitive) {
if self.top >= STACK_SIZE {
panic!("Stack overflow");
}
self.stack[self.top] = value;
self.top += 1;
}
#[inline(always)]
pub fn pop(&mut self) -> Primitive {
if self.top == 0 {
panic!("Stack underflow");
}
self.top -= 1;
self.stack[self.top]
}
#[inline(always)]
pub fn pop2(&mut self) -> (Primitive, Primitive) {
(self.pop(), self.pop())
}
#[inline(always)]
pub fn peek(&self) -> Primitive {
self.stack[self.top - 1]
}
}
pub struct ObjectMap {
free: usize,
heap: Vec<Object>,
}
impl Default for ObjectMap {
fn default() -> Self {
Self::with_capacity(32)
}
}
impl From<Vec<Object>> for ObjectMap {
fn from(heap: Vec<Object>) -> Self {
let mut free = heap.len();
for (idx, obj) in heap.iter().enumerate() {
if let ObjectType::Free { .. } = obj.typ {
free = idx;
break;
}
}
Self { free, heap }
}
}
impl ObjectMap {
pub fn with_capacity(capacity: usize) -> Self {
let mut heap = Vec::with_capacity(capacity);
for i in 0..capacity {
heap.push(Object::new(ObjectType::Free { next: i + 1 }));
}
Self { free: 0, heap }
}
pub fn allocate(&mut self, object: Object) -> usize {
let current = self.free;
if current >= self.heap.len() {
self.heap
.push(Object::new(ObjectType::Free { next: current + 1 }))
}
let ObjectType::Free { next } = self.heap[current].typ else {
panic!("Allocation failed: Expected free location wasn't free");
};
self.heap[current] = object;
self.free = next;
current
}
pub fn get(&self, idx: usize) -> Option<&Object> {
self.heap.get(idx)
}
pub fn get_mut(&mut self, idx: usize) -> Option<&mut Object> {
self.heap.get_mut(idx)
}
}
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