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perf: 执行期 GC 收集——扩展 mark 跟随 epoch 臂、活 epoch 对象晋升 session（克隆体置活防同轮原地 sweep 误放）、死 session 对象原地释放出表，for-in 门控（活跃迭代器 + 挂起状态盒）与分配包络水位触发

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彭俊皓
2026-09-12 00:25:56 +00:00
parent e5538d85d6
commit 390b72e3bd
8 changed files with 536 additions and 52 deletions
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crates/oxide_vm/src/session_arena.rs
+31 -15
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@@ -141,53 +141,69 @@ impl Vm {
return;
}
let mut forwarding = std::mem::take(&mut self.gc_state.forwarding);
for &ptr in &objects {
self.rewrite_session_epoch_refs(&objects, &mut forwarding);
forwarding.clear();
self.gc_state.forwarding = forwarding;
// 改写期新克隆已随晋升推入 gc_state 侧的表（此刻仅含克隆体），把取出的
// 旧对象按原相对序拼回同一表，表 = 克隆体 + 旧对象，各恰登记一次。
self.gc_state.session_object_ptrs.extend(objects);
}
/// 按调用方给定的转发表把对象列表的 epoch 子引用就地改写：未在上游晋升过的
/// epoch 子对象经转发表克隆进 session（递归去重共享与环），已是 session/
/// 非 epoch 的值原样保留。JS 边与 native 状态盒走同一改写闭包。
///
/// # 注意事项
/// - 调用方持有转发表期间不得让其它晋升路径改动 `gc_state.forwarding`；
/// 晋升新克隆推入的对象表由调用方决定何时拼回。
/// - 死对象（不可达）的 epoch 子引用改写会把死对象一并克隆进 session——
/// 克隆体无根，下一轮收集按死对象出表，不泄漏也不悬垂。
pub(crate) fn rewrite_session_epoch_refs(
&mut self, objects: &[*mut JsObject], forwarding: &mut HashMap<*mut JsObject, *mut JsObject, FxBuildHasher>,
) {
for &ptr in objects {
if ptr.is_null() {
continue;
}
// SAFETY: ptr 来自 session_epoch.alloc，arena 存活期内有效。
unsafe {
let obj = &mut *ptr;
obj.rewrite_object_values(|value| self.promote_value_if_epoch_object(value, &mut forwarding));
obj.rewrite_object_values(|value| self.promote_value_if_epoch_object(value, forwarding));
if obj.is_map() {
map::rewrite_map_native(obj, |value| self.promote_value_if_epoch_object(value, &mut forwarding));
map::rewrite_map_native(obj, |value| self.promote_value_if_epoch_object(value, forwarding));
} else if obj.is_set() {
set::rewrite_set_native(obj, |value| self.promote_value_if_epoch_object(value, &mut forwarding));
set::rewrite_set_native(obj, |value| self.promote_value_if_epoch_object(value, forwarding));
} else if obj.is_disposable_stack_obj() || obj.is_async_disposable_stack_obj() {
disposable_stack::rewrite_dispose_native(obj, |value| {
self.promote_value_if_epoch_object(value, &mut forwarding)
self.promote_value_if_epoch_object(value, forwarding)
});
} else if obj.is_typed_array_obj() {
typed_array::rewrite_typed_array_native(obj, |value| {
self.promote_value_if_epoch_object(value, &mut forwarding)
self.promote_value_if_epoch_object(value, forwarding)
});
} else if obj.is_data_view_obj() {
data_view::rewrite_data_view_native(obj, |value| {
self.promote_value_if_epoch_object(value, &mut forwarding)
self.promote_value_if_epoch_object(value, forwarding)
});
} else if obj.is_generator_obj() {
crate::generator::rewrite_generator_native(obj, |value| {
self.promote_value_if_epoch_object(value, &mut forwarding)
self.promote_value_if_epoch_object(value, forwarding)
});
} else if obj.is_promise_obj() {
crate::promise::rewrite_promise_native(obj, |value| {
self.promote_value_if_epoch_object(value, &mut forwarding)
self.promote_value_if_epoch_object(value, forwarding)
});
} else if obj.is_async_obj() {
crate::async_func::rewrite_async_native(obj, |value| {
self.promote_value_if_epoch_object(value, &mut forwarding)
self.promote_value_if_epoch_object(value, forwarding)
});
} else if obj.is_async_generator_obj() {
crate::async_generator::rewrite_async_generator_native(obj, |value| {
self.promote_value_if_epoch_object(value, &mut forwarding)
self.promote_value_if_epoch_object(value, forwarding)
});
}
}
}
forwarding.clear();
self.gc_state.forwarding = forwarding;
// 晋升过程新克隆的对象已推入 gc_state 侧的表，拼回旧表保持原序在前。
self.gc_state.session_object_ptrs.extend(objects);
}
/// 把根直接持有的 epoch 对象（顶层 var 寄存器、挂起句柄等）晋升进 session，