7 unstable releases (3 breaking)
0.4.3 | Jul 17, 2024 |
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0.4.2 | Jul 16, 2024 |
0.3.0 | Jul 15, 2024 |
0.2.0 | Jul 15, 2024 |
0.1.0 | Jul 15, 2024 |
#68 in #vm
23 downloads per month
Used in fn_vm
18KB
432 lines
vm_value
Core value trait used by fn_vm, this crate is meant to provide the building blocks to creating pass by value VMs in rust.
Implementing these traits allow you to easily create a VM with all base binary and unary operations (Add, Sub, Rem, Not, etc).
Values
Currently this trait is implemented for ints (i8 - i128 & isize), VMStr (an opinionated wrapped around String), and VarNum (VarInt, VarUInt, and VarFloat).
Length and VarNum (number implementation of VMValue) provided by small_len and var_num respectively.
pub struct VMStatus<O, V> {
pub done: bool,
pub last_command: O,
pub value: Option<V>,
}
pub trait VM<Op, Val, T: VMValue<Op, Val, T>> {
type Error;
fn run(&mut self) -> Result<VMStatus<Op, Val>, Self::Error>;
fn execute(&mut self) -> Result<(), Self::Error>;
fn next_len(&mut self) -> Length{
let u8 = self.next_byte();
match u8 {
253 => Length::Word(u16::from_be_bytes(self.next_n_bytes::<2>())),
254 => Length::Double(u32::from_be_bytes(self.next_n_bytes::<4>())),
255 => Length::Quad(u64::from_be_bytes(self.next_n_bytes::<8>())),
_ => {
u8.into()
}
}
}
fn next_byte(&mut self) -> u8;
fn next_str(&mut self) -> String {
let len = self.next_len();
let bytes = self.next_n_bytes_vec(len);
std::str::from_utf8(&bytes).unwrap().to_string()
}
fn next_n_bytes<const N: usize>(&mut self) -> [u8; N];
fn next_n_bytes_vec(&mut self, n: Length) -> Vec<u8>;
}
pub trait Logical: Clone + Sized {
fn bool_and(&self, b: &Self) -> bool;
fn bool_or(&self, b: &Self) -> bool;
fn bool_xor(&self, b: &Self) -> bool;
fn bool_not(&self) -> bool;
fn logical_and(&self, b: &Self) -> Self {
if self.bool_and(b) {
self.clone()
} else {
b.clone()
}
}
fn logical_or(&self, b: &Self) -> Self {
if self.bool_or(b) {
self.clone()
} else {
b.clone()
}
}
fn logical_xor(&self, b: &Self) -> Self {
if self.bool_xor(b) {
self.clone()
} else {
b.clone()
}
}
fn bitwise_reverse(&self) -> Self;
}
pub trait VMValue<Op, Val, T: VMValue<Op, Val, T>>: Display + Debug + Clone + PartialEq + Logical + Add<Output=T> + Mul<Output=T> + Div<Output=T> + PartialOrd + Sub<Output=T> + BitAnd<Output=T> + BitOr<Output=T> + BitXor<Output=T> + Rem<Output=T> + Not<Output=T> + Neg<Output=T> + Shr<Output=T> + Shl<Output=T> {
fn create_from_vm_bytes<V: VM<Op, Val, T>>(vm: &mut V) -> T;
fn to_vm_bytes(&self) -> Vec<u8>;
}
Dependencies
~1.3–2MB
~33K SLoC