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//! (EnvironmentSlot,EnvironmentHops) pair represent the reference to a slot in
//! an environment object in the environment chain.
//!
//! See the SMDOC comment in m-c/js/src/vm/EnvironmentObject.h for the details
//! about environment object and environment chain.
/// Slot in the environmentslot object.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Ord, PartialOrd)]
pub struct EnvironmentSlot {
slot: u32,
}
impl EnvironmentSlot {
pub fn new(slot: u32) -> Self {
Self { slot }
}
pub fn next(&mut self) {
self.slot += 1;
}
}
impl From<EnvironmentSlot> for u32 {
fn from(slot: EnvironmentSlot) -> u32 {
slot.slot
}
}
/// The number of environment objects to skip (hop) on the environment chain in
/// order to find the associated environment object.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Ord, PartialOrd)]
pub struct EnvironmentHops {
hops: u8,
}
impl EnvironmentHops {
pub fn new(hops: u8) -> Self {
Self { hops }
}
pub fn next(&mut self) {
self.hops += 1;
}
}
impl From<EnvironmentHops> for u8 {
fn from(hops: EnvironmentHops) -> u8 {
hops.hops
}
}