feat: Atomics.waitAsync/pause 异步臂与 notify 唤醒面

crates/oxide_vm/src/vm/gc_hooks.rs

@@ -75,6 +75,12 @@ impl Vm {
         for job in &self.job_queue {
             crate::promise::for_each_job_value(job, &mut f);
         }
+        // Atomics waiter 表登记的 promise 是 GC 根（run 内跨调用存活）。
+        for promises in self.atomics_waiters.values() {
+            for p in promises {
+                f(*p);
+            }
+        }
         for iter in &self.iters.for_in_iters {
             if iter.is_null() {
                 continue;
@@ -150,6 +156,12 @@ impl Vm {
         for job in &mut self.job_queue {
             crate::promise::rewrite_job_values(job, &mut rewrite);
         }
+        // Atomics waiter 表中的 promise 随 sweep 重写（与 mark 段一一对应）。
+        for promises in self.atomics_waiters.values_mut() {
+            for p in promises {
+                *p = rewrite(*p);
+            }
+        }
         for iter in &mut self.iters.for_in_iters {
             if iter.is_null() {
                 continue;

crates/oxide_vm/src/vm/mod.rs

@@ -189,6 +189,10 @@ pub struct Vm {
     pub async_generator_function_proto: P<JsObject>,
     /// 微任务队列（Promise reactions / thenable 委托），`run()` 末尾 FIFO drain。
     pub(crate) job_queue: VecDeque<crate::promise::Microtask>,
+    /// Atomics.waitAsync waiter 表：键 = (缓冲对象指针, 元素字节偏移)，值 =
+    /// 登记的 promise FIFO。键取登记时刻视图的 `buffer` 现指针（同 run 无 GC 时
+    /// notify 侧读同一指针恒匹配）；run 边界清空，清位后 promise 无强根自然回收。
+    pub(crate) atomics_waiters: HashMap<(u64, usize), Vec<JsValue>>,
     pub math_rng_state: u64,
     /// 子模块平表的表代际注册表：键 = 表代际（`current_gen` 为当前 run 正在
     /// 装载的代际）。函数对象创建时记录自身所属代际（`JsObject::table_gen`），

crates/oxide_vm/src/vm/vmhost.rs

@@ -216,4 +216,13 @@ impl oxide_runtime_api::VmHost for Vm {
     fn symbol_key_for_id(&self, idx: u32) -> Option<String> {
         self.symbols.key_for_id(idx)
     }
+    fn atomics_new_waiter_promise(&mut self) -> JsValue {
+        self.atomics_new_waiter_promise()
+    }
+    fn atomics_register_waiter(&mut self, buffer: *mut JsObject, offset: usize, promise: JsValue) {
+        self.atomics_register_waiter(buffer, offset, promise)
+    }
+    fn atomics_wake_waiters(&mut self, buffer: *mut JsObject, offset: usize, count: f64) -> usize {
+        self.atomics_wake_waiters(buffer, offset, count)
+    }
 }