Use Vec<T> for keeping track of gc objects

boa_gc/src/internals/ephemeron_box.rs

@@ -19,7 +19,6 @@ const NON_ROOTS_MAX: u32 = NON_ROOTS_MASK;
 pub(crate) struct EphemeronBoxHeader {
     ref_count: Cell<u32>,
     non_root_count: Cell<u32>,
-    pub(crate) next: Cell<Option<NonNull<dyn ErasedEphemeronBox>>>,
 }
 
 impl EphemeronBoxHeader {
@@ -28,7 +27,6 @@ impl EphemeronBoxHeader {
         Self {
             ref_count: Cell::new(1),
             non_root_count: Cell::new(0),
-            next: Cell::new(None),
         }
     }
 

boa_gc/src/internals/gc_box.rs

@@ -1,9 +1,5 @@
 use crate::Trace;
-use std::{
-    cell::Cell,
-    fmt,
-    ptr::{self, NonNull},
-};
+use std::{cell::Cell, fmt, ptr};
 
 const MARK_MASK: u32 = 1 << (u32::BITS - 1);
 const NON_ROOTS_MASK: u32 = !MARK_MASK;
@@ -20,7 +16,6 @@ const NON_ROOTS_MAX: u32 = NON_ROOTS_MASK;
 pub(crate) struct GcBoxHeader {
     ref_count: Cell<u32>,
     non_root_count: Cell<u32>,
-    pub(crate) next: Cell<Option<NonNull<GcBox<dyn Trace>>>>,
 }
 
 impl GcBoxHeader {
@@ -29,7 +24,6 @@ impl GcBoxHeader {
         Self {
             ref_count: Cell::new(1),
             non_root_count: Cell::new(0),
-            next: Cell::new(None),
         }
     }
 

boa_gc/src/internals/weak_map_box.rs

@@ -1,20 +1,15 @@
 use crate::{pointers::RawWeakMap, GcRefCell, Trace, WeakGc};
-use std::{cell::Cell, ptr::NonNull};
 
 /// A box that is used to track [`WeakMap`][`crate::WeakMap`]s.
 pub(crate) struct WeakMapBox<K: Trace + Sized + 'static, V: Trace + Sized + 'static> {
     pub(crate) map: WeakGc<GcRefCell<RawWeakMap<K, V>>>,
-    pub(crate) next: Cell<Option<NonNull<dyn ErasedWeakMapBox>>>,
 }
 
 /// A trait that is used to erase the type of a [`WeakMapBox`].
 pub(crate) trait ErasedWeakMapBox {
     /// Clear dead entries from the [`WeakMapBox`].
     fn clear_dead_entries(&self);
 
-    /// A pointer to the next [`WeakMapBox`].
-    fn next(&self) -> &Cell<Option<NonNull<dyn ErasedWeakMapBox>>>;
-
     /// Returns `true` if the [`WeakMapBox`] is live.
     fn is_live(&self) -> bool;
 
@@ -31,10 +26,6 @@ impl<K: Trace, V: Trace + Clone> ErasedWeakMapBox for WeakMapBox<K, V> {
         }
     }
 
-    fn next(&self) -> &Cell<Option<NonNull<dyn ErasedWeakMapBox>>> {
-        &self.next
-    }
-
     fn is_live(&self) -> bool {
         self.map.upgrade().is_some()
     }