feat: 新增 Event 基类载荷盒、GC 接线、构造器与原型绑定

Cargo.lock

@@ -1160,7 +1160,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_builtins"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "chrono",
  "fast-float",
@@ -1185,7 +1185,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_bytecode"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "num-bigint",
  "oxide_log",
@@ -1193,7 +1193,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_cfg"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "oxide_bytecode",
  "oxide_emit",
@@ -1204,7 +1204,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_cli"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "ansi_term",
  "bumpalo",
@@ -1226,7 +1226,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_code_cache"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "lru",
  "oxide_bytecode",
@@ -1235,7 +1235,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_compiler"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1255,7 +1255,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_dce"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1269,7 +1269,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_emit"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "num-bigint",
  "oxc_allocator",
@@ -1284,7 +1284,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_engine"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "oxide_bytecode",
  "oxide_compiler",
@@ -1296,7 +1296,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_ir"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "oxide_bytecode",
  "oxide_log",
@@ -1305,7 +1305,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_kernel"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "bumpalo",
  "dashmap",
@@ -1319,7 +1319,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_liveness"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1331,7 +1331,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_log"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "tracing",
  "tracing-appender",
@@ -1340,7 +1340,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_parser"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "oxc_allocator",
  "oxc_ast",
@@ -1355,7 +1355,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_regalloc"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1371,7 +1371,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_runtime_api"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "num-bigint",
  "num-traits",
@@ -1384,7 +1384,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_test262"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "oxide_bytecode",
  "oxide_compiler",
@@ -1402,7 +1402,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_types"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "bumpalo",
  "dashmap",
@@ -1415,7 +1415,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_vm"
-version = "0.14.7"
+version = "0.14.8"
 dependencies = [
  "bumpalo",
  "chrono",

Cargo.toml

@@ -23,7 +23,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.14.7"
+version = "0.14.8"
 edition = "2021"
 license = "MIT"
 rust-version = "1.80"

crates/oxide_builtins/src/event.rs

@@ -0,0 +1,405 @@
+//! Event 基类行为面：`Event` 构造器（`new Event(type, init)`）、原型 getter
+//! （type / target / currentTarget / eventPhase / isTrusted / bubbles /
+//! cancelable / defaultPrevented / composed）与原型方法（preventDefault /
+//! stopPropagation / stopImmediatePropagation / composedPath）。
+//!
+//! 事件载荷盒（type 串与九项状态位）存于对象 `native_fn` 槽，向 GC 家族表
+//! 暴露 edges/size/drop 三自由函数。
+
+use std::mem;
+
+use oxide_kernel::shape_forge::EMPTY_SHAPE_ID;
+use oxide_types::object::{JsObject, NativeFnPtr};
+use oxide_types::value::JsValue;
+
+use oxide_runtime_api::{NativeResult, ProtoKind, VmHost};
+
+/// Event 载荷盒：存于对象 `native_fn` 槽（`Box::into_raw`，realm 局部单线程）。
+/// `r#type` 是事件类型串（GC 字符串边），`target` / `current_target` 是目标
+/// 对象（GC 对象边，初始 null），其余为简单状态位。
+struct EventInner {
+    r#type: JsValue,
+    target: JsValue,
+    current_target: JsValue,
+    event_phase: u32,
+    is_trusted: bool,
+    bubbles: bool,
+    cancelable: bool,
+    default_prevented: bool,
+    propagation_stopped: bool,
+    immediate_stopped: bool,
+    composed: bool,
+}
+
+/// 取载荷盒指针：仅 Event 标签对象返回 `Some`，其余标签返回 `None`。
+fn event_payload_ptr(obj: &JsObject) -> Option<*mut EventInner> {
+    if !obj.is_event_obj() {
+        return None;
+    }
+    obj.native_fn().map(|ptr| ptr.as_ptr() as *mut EventInner)
+}
+
+/// 收集 Event 的引用边（type 串边与 target / current_target 对象边）。
+///
+/// `target` / `current_target` 空窗口（构造期回填之前）为 null，边函数自守，
+/// 语义自含。
+pub fn event_native_edges(obj: &JsObject) -> Vec<JsValue> {
+    let Some(ptr) = event_payload_ptr(obj) else {
+        return Vec::new();
+    };
+    if ptr.is_null() {
+        return Vec::new();
+    }
+    // SAFETY: ptr 指向有效载荷盒（槽位仅构造期写入、释放时置空），只读字段。
+    let inner = unsafe { &*ptr };
+    vec![inner.r#type, inner.target, inner.current_target]
+}
+
+/// 只读核算 Event 载荷盒字节（不释放）。
+pub fn event_native_size(obj: &JsObject) -> u64 {
+    let Some(ptr) = event_payload_ptr(obj) else {
+        return 0;
+    };
+    if ptr.is_null() {
+        return 0;
+    }
+    mem::size_of::<EventInner>() as u64
+}
+
+/// 释放 Event 载荷盒（`Box<EventInner>`），返回释放字节数。
+///
+/// 盒 drop 时 type / target / current_target 的 JsValue 边随盒释放（GC 已
+/// 判定死对象）；槽置空保证重复调用零释放（幂等）。
+pub fn drop_event_native(obj: &mut JsObject) -> u64 {
+    let bytes = event_native_size(obj);
+    if bytes == 0 {
+        return 0;
+    }
+    let Some(ptr) = event_payload_ptr(obj) else {
+        return 0;
+    };
+    // SAFETY: ptr 非空（event_native_size 已验证），Box::from_raw 恰好释放一次。
+    unsafe {
+        drop(Box::from_raw(ptr));
+    }
+    obj.set_native_fn(None);
+    bytes
+}
+
+/// 解析 this 为 Event 载荷盒共享引用：非 Event 对象或无载荷盒返回 None。
+///
+/// # 注意事项
+/// 返回引用按 `'a` 声称为存活，实际存活至载荷盒被 GC 释放；调用方须在无 GC
+/// 窗口的单 native 函数内消费，不得跨用户调用窗口持有。
+fn event_inner_of<'a>(this_val: JsValue) -> Option<&'a EventInner> {
+    if !this_val.is_object() {
+        return None;
+    }
+    let obj_ptr = this_val.as_js_object_ptr();
+    if obj_ptr.is_null() {
+        return None;
+    }
+    // SAFETY: this_val 已确认是对象值，obj_ptr 指向合法 JsObject。
+    let obj = unsafe { &*obj_ptr };
+    if !obj.is_event_obj() {
+        return None;
+    }
+    let box_ptr = event_payload_ptr(obj)?;
+    if box_ptr.is_null() {
+        return None;
+    }
+    // SAFETY: box_ptr 指向有效载荷盒（构造期写入、释放时置空）；'a 存活由
+    // 调用方「无 GC 窗口内消费」约定保证。
+    Some(unsafe { &*box_ptr })
+}
+
+/// 解析 this 为 Event 载荷盒可变引用：非 Event 对象或无载荷盒返回 None。
+///
+/// # 注意事项
+/// 返回引用按 `'a` 声称为存活，实际存活至载荷盒被 GC 释放；调用方须在无 GC
+/// 窗口的单 native 函数内消费，不得跨用户调用窗口持有。
+fn event_inner_of_mut<'a>(this_val: JsValue) -> Option<&'a mut EventInner> {
+    if !this_val.is_object() {
+        return None;
+    }
+    let obj_ptr = this_val.as_js_object_ptr();
+    if obj_ptr.is_null() {
+        return None;
+    }
+    // SAFETY: this_val 已确认是对象值，obj_ptr 指向合法 JsObject。
+    let obj = unsafe { &mut *obj_ptr };
+    if !obj.is_event_obj() {
+        return None;
+    }
+    let box_ptr = event_payload_ptr(obj)?;
+    if box_ptr.is_null() {
+        return None;
+    }
+    // SAFETY: box_ptr 指向有效载荷盒（构造期写入、释放时置空）；'a 存活由
+    // 调用方「无 GC 窗口内消费」约定保证。
+    Some(unsafe { &mut *box_ptr })
+}
+
+/// Event 构造器：`new Event(type, init)`。
+///
+/// # 步骤
+/// 1. 非构造形态（`!constructing_native`）抛 TypeError（HTML 规范只有
+///    [[Construct]]，无 [[Call]]）
+/// 2. type 经完整 ToString 转串；空串抛 SyntaxError
+/// 3. init 字典读 bubbles / cancelable / composed（缺省 false）
+/// 4. 建载荷盒入 receiver 的 `native_fn` 槽，置 type_tag
+/// 5. 返回 receiver
+///
+/// # 边界与前提
+/// - receiver（`args[0]`）是 VM 按构造器 prototype 新分配的对象，proto 已
+///   指向 %Event.prototype%；
+/// - init 缺省（undefined）或非对象时对应标志取 false。
+///
+/// # 副作用
+/// - receiver 的 `native_fn` 槽写入载荷盒、`type_tag` 置 Event 标签。
+pub fn event_constructor<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    if !vm.constructing_native() {
+        return NativeResult::Err(crate::error::create_type_error(vm, "Event constructor requires new"));
+    }
+
+    let this_val = vm.reg(args[0]);
+    if !this_val.is_object() {
+        return NativeResult::Err(crate::error::create_type_error(vm, "Event constructor requires new"));
+    }
+
+    // type 经完整 ToString 转串（对象经 ToPrimitive，Symbol 抛 TypeError）。
+    let type_val = if args.len() > 1 { vm.reg(args[1]) } else { JsValue::undefined() };
+    let type_str = match oxide_runtime_api::to_string_full(type_val, vm) {
+        Ok(s) => s,
+        Err(_) => {
+            if let Some(exc) = vm.take_uncaught_value() {
+                return NativeResult::Err(exc);
+            }
+            return NativeResult::Err(crate::error::create_type_error(vm, "Cannot convert value to a string"));
+        }
+    };
+    if type_str.is_empty() {
+        return NativeResult::Err(crate::error::create_syntax_error(vm, "The provided type is empty"));
+    }
+
+    // init 字典读 bubbles / cancelable / composed（缺省或非对象时取 false）。
+    let mut bubbles = false;
+    let mut cancelable = false;
+    let mut composed = false;
+    if args.len() > 2 {
+        let init_val = vm.reg(args[2]);
+        if init_val.is_object() {
+            let init_ptr = init_val.as_js_object_ptr();
+            // SAFETY: init_val 已确认是对象值，借用即时消费。
+            let init_obj = unsafe { &*init_ptr };
+            for (name, slot) in
+                [("bubbles", &mut bubbles), ("cancelable", &mut cancelable), ("composed", &mut composed)]
+            {
+                let si = vm.perm_intern(name);
+                match vm.ordinary_get(init_obj, si, init_val) {
+                    Ok(v) => *slot = oxide_runtime_api::to_boolean(v),
+                    Err(_) => {
+                        if let Some(exc) = vm.take_uncaught_value() {
+                            return NativeResult::Err(exc);
+                        }
+                        return NativeResult::Err(crate::error::create_type_error(
+                            vm,
+                            "Event init property getter failed",
+                        ));
+                    }
+                }
+            }
+        }
+    }
+
+    // 建载荷盒入 receiver 的 native_fn 槽，置 Event 标签。
+    let type_js = vm.new_string(&type_str);
+    let inner = Box::into_raw(Box::new(EventInner {
+        r#type: type_js,
+        target: JsValue::null(),
+        current_target: JsValue::null(),
+        event_phase: 0,
+        is_trusted: false,
+        bubbles,
+        cancelable,
+        default_prevented: false,
+        propagation_stopped: false,
+        immediate_stopped: false,
+        composed,
+    }));
+    // SAFETY: receiver 不可调用，native_fn 存不透明 `Box<EventInner>` 指针，
+    // 与 ArrayBuffer / RegExp 的类型化存储模式一致。
+    let obj = unsafe { &mut *this_val.as_js_object_ptr() };
+    obj.type_tag = JsObject::OBJ_TYPE_EVENT;
+    obj.set_native_fn(Some(unsafe { NativeFnPtr::from_raw(inner as *const ()) }));
+    NativeResult::Ok(this_val)
+}
+
+/// `Event.prototype.type`：返回事件类型串。
+pub fn event_type_getter<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.type getter called on non-Event object",
+        ));
+    };
+    NativeResult::Ok(inner.r#type)
+}
+
+/// `Event.prototype.target`：返回事件目标对象（未派发时 null）。
+pub fn event_target_getter<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.target getter called on non-Event object",
+        ));
+    };
+    NativeResult::Ok(inner.target)
+}
+
+/// `Event.prototype.currentTarget`：返回当前派发目标（未派发时 null）。
+pub fn event_current_target_getter<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.currentTarget getter called on non-Event object",
+        ));
+    };
+    NativeResult::Ok(inner.current_target)
+}
+
+/// `Event.prototype.eventPhase`：返回派发阶段（0 未派发 / 1 捕获 / 2 目标 / 3 冒泡）。
+pub fn event_phase_getter<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.eventPhase getter called on non-Event object",
+        ));
+    };
+    NativeResult::Ok(JsValue::int(inner.event_phase as i32))
+}
+
+/// `Event.prototype.isTrusted`：返回是否由用户操作产生（引擎恒 false）。
+pub fn event_is_trusted_getter<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.isTrusted getter called on non-Event object",
+        ));
+    };
+    NativeResult::Ok(JsValue::bool(inner.is_trusted))
+}
+
+/// `Event.prototype.bubbles`：返回是否冒泡。
+pub fn event_bubbles_getter<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.bubbles getter called on non-Event object",
+        ));
+    };
+    NativeResult::Ok(JsValue::bool(inner.bubbles))
+}
+
+/// `Event.prototype.cancelable`：返回是否可取消。
+pub fn event_cancelable_getter<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.cancelable getter called on non-Event object",
+        ));
+    };
+    NativeResult::Ok(JsValue::bool(inner.cancelable))
+}
+
+/// `Event.prototype.defaultPrevented`：返回默认行为是否已被阻止。
+pub fn event_default_prevented_getter<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.defaultPrevented getter called on non-Event object",
+        ));
+    };
+    NativeResult::Ok(JsValue::bool(inner.default_prevented))
+}
+
+/// `Event.prototype.composed`：返回是否跨 Shadow DOM 边界。
+pub fn event_composed_getter<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.composed getter called on non-Event object",
+        ));
+    };
+    NativeResult::Ok(JsValue::bool(inner.composed))
+}
+
+/// `Event.prototype.preventDefault`：cancelable 时置 defaultPrevented。
+pub fn event_prevent_default<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of_mut(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.preventDefault called on non-Event object",
+        ));
+    };
+    if inner.cancelable {
+        inner.default_prevented = true;
+    }
+    NativeResult::Ok(JsValue::undefined())
+}
+
+/// `Event.prototype.stopPropagation`：置传播停止标志。
+pub fn event_stop_propagation<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of_mut(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.stopPropagation called on non-Event object",
+        ));
+    };
+    inner.propagation_stopped = true;
+    NativeResult::Ok(JsValue::undefined())
+}
+
+/// `Event.prototype.stopImmediatePropagation`：置传播停止与立即停止双标志。
+pub fn event_stop_immediate_propagation<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(inner) = event_inner_of_mut(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.stopImmediatePropagation called on non-Event object",
+        ));
+    };
+    inner.propagation_stopped = true;
+    inner.immediate_stopped = true;
+    NativeResult::Ok(JsValue::undefined())
+}
+
+/// `Event.prototype.composedPath`：返回事件传播路径（首版仅含 this 自身）。
+pub fn event_composed_path<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(if args.is_empty() { 0 } else { args[0] });
+    let Some(_) = event_inner_of(this_val) else {
+        return NativeResult::Err(crate::error::create_type_error(
+            vm,
+            "Event.prototype.composedPath called on non-Event object",
+        ));
+    };
+    // 首版：路径仅含 this 自身（完整传播路径由事件派发任务补全）。
+    let array_proto = JsValue::from_js_object(vm.builtin_proto(ProtoKind::ArrayProto));
+    let arr = vm.alloc_object(JsObject::new_array(EMPTY_SHAPE_ID, array_proto, 1));
+    // SAFETY: arr 是本函数刚分配的对象，存活且本段无别名。
+    unsafe {
+        (*arr).set_prop_at(0, this_val);
+    }
+    NativeResult::Ok(JsValue::from_js_object(arr))
+}

crates/oxide_builtins/src/lib.rs

@@ -34,6 +34,8 @@ pub mod disposable_stack;
 pub mod error;
 /// eval 全局函数实现（动态编译执行脚本/表达式）。
 pub mod eval;
+/// Event 基类实现（构造器、原型 getter 与传播方法，载荷盒与 GC 三自由函数族）。
+pub mod event;
 /// Function 内置对象实现（call/apply/bind/toString）。
 pub mod function;
 /// 全局函数模块（URI 编解码与 Annex B 的 escape/unescape）。

crates/oxide_types/src/object.rs

@@ -232,6 +232,14 @@ impl JsObject {
     /// 载荷盒（`BroadcastChannelInner`），无对象边（mpsc 非 GC 边、通道名为
     /// Rust `String`）。
     pub const OBJ_TYPE_BROADCAST_CHANNEL: u8 = 34;
+    /// Event 对象：事件基类载荷盒（type 串与九项状态位）存于 `native_fn` 槽。
+    pub const OBJ_TYPE_EVENT: u8 = 35;
+    /// MessageEvent 对象：事件派生类载荷盒（data 与 ports 边）存于 `native_fn` 槽。
+    pub const OBJ_TYPE_MESSAGE_EVENT: u8 = 36;
+    /// ErrorEvent 对象：事件派生类载荷盒（message 与 error 边）存于 `native_fn` 槽。
+    pub const OBJ_TYPE_ERROR_EVENT: u8 = 37;
+    /// CustomEvent 对象：事件派生类载荷盒（detail 边）存于 `native_fn` 槽。
+    pub const OBJ_TYPE_CUSTOM_EVENT: u8 = 38;
     /// `is_session_epoch` 字段中的 session 标记位。
     pub const SESSION_EPOCH_BIT: u8 = 0x01;
     /// `is_session_epoch` 字段中的 GC 标记位。
@@ -319,6 +327,11 @@ impl JsObject {
     pub fn is_broadcast_channel(&self) -> bool {
         self.type_tag == Self::OBJ_TYPE_BROADCAST_CHANNEL
     }
+    /// 是否 Event 对象（`native_fn` 槽存事件基类载荷盒）。
+    #[inline]
+    pub fn is_event_obj(&self) -> bool {
+        self.type_tag == Self::OBJ_TYPE_EVENT
+    }
     /// 是否 DataView 对象。
     #[inline]
     pub fn is_data_view_obj(&self) -> bool {

crates/oxide_vm/src/bindings/bind_event.rs

@@ -1,28 +1,165 @@
-//! Event 体系绑定：本文件是内核接线占位（零行为变化）。九枚 P 字段
-//! （Event / MessageEvent / ErrorEvent / CustomEvent 四枚原型与构造器对加
-//! EventTarget 原型）当前是空对象，本函数为它们的绑定入口预留，真实构造器 /
-//! 原型方法 / 原型链连线由后续任务就地填充（不新建对象——P 字段本身就是槽位，
-//! 快照 / 脏检查 / 收尾枚举已覆盖）。
+//! Event 基类绑定：就地填充 `event_constructor` / `event_proto` 两枚 P 字段
+//! 占位（构造器本体、原型方法、原型 getter 与 Event 常量），并绑全局 `Event`。
+//!
+//! 九枚 P 字段中其余七枚（MessageEvent / ErrorEvent / CustomEvent 四对加
+//! EventTarget 原型）由后续子任务就地填充，本函数不读不写。
 
 use std::sync::Arc;
 
+use crate::bind_constructor;
+use crate::bindings::{apply_binding_table, bind_accessor_getter, configure_native_constructor};
 use oxide_kernel::kernel::{KernelCore, KernelSession};
-use oxide_types::object::JsObject;
+use oxide_types::object::{JsObject, PropAttributes};
+use oxide_types::value::JsValue;
 
-/// Event 体系绑定入口（当前为空占位）。
+/// 把 Event 构造器与原型方法绑定到 global。
+///
+/// `event_constructor` / `event_proto` 两枚 P 字段是空对象占位，本函数就地
+/// 填充（不新建对象——P 字段本身就是槽位，快照/脏检查/收尾枚举已覆盖）。
 ///
 /// # 幂等
 /// 本函数从三条路径到达：`init_kernel_builtins`（占位是空对象）、
-/// `rebind_dirty_builtins` 的 `event` 分支（占位是重建后的空对象）、
-/// global-dirty 路径（占位可能已填满）。本函数当前不写任何槽位，空操作天然
-/// 幂等；后续任务就地填充时，各槽写须沿用 `lookup_position` 前置守卫
-/// （有槽即跳过），保持与 `bind_broadcast_channel` 同型的幂等契约。
+/// `rebind_dirty_builtins` 的 `event` 分支（占位是重建后的空对象）、global-dirty
+/// 路径（占位可能已填满）。全部槽写经 `lookup_position` 前置守卫，有槽即跳过；
+/// `bind_constructor!` 的全局槽臂自带既有槽原位更新，天然幂等。
 ///
-/// # 边界
-/// 九枚 P 字段是空对象占位，本函数不读不写，行为与未调用一致；
-/// EventTarget 原型不占 ProtoKind（builtins 不读它），绑定层后续直接访问
-/// `world.event_target_proto` 槽。
-///
-/// `core` / `session` / `global` / `realm_id` 当前未使用，保留签名与其他
-/// 绑定函数一致，供后续任务就地填充时直接取用。
-pub fn bind_event(_core: &Arc<KernelCore>, _session: &KernelSession, _global: &mut JsObject, _realm_id: u32) {}
+/// `realm_id` 未使用（Event 无 well-known 符号键），保留签名与其他绑定函数一致。
+pub fn bind_event(core: &Arc<KernelCore>, session: &KernelSession, global: &mut JsObject, _realm_id: u32) {
+    let world = session.builtin_world();
+    let ctor_ptr = world.event_constructor.as_ptr() as *mut JsObject;
+    let ctor = unsafe { &mut *ctor_ptr };
+    let proto_ptr = world.event_proto.as_ptr() as *mut JsObject;
+    let proto = unsafe { &mut *proto_ptr };
+
+    let sf = core.perm_interner().as_ref();
+    let sh = core.shape_forge().as_ref();
+
+    // ---- 填构造器占位 ----
+    ctor.set_function(true);
+
+    // prototype 槽 → 原型对象（描述符 {f,f,f}）。
+    let si_prototype = sf.intern("prototype").0;
+    if sh.lookup_position(ctor.shape_id(), si_prototype).is_none() {
+        let shape = sh.make_shape(ctor.shape_id(), si_prototype);
+        ctor.set_shape_id(shape);
+        let pos = ctor.push_prop(JsValue::from_js_object(proto_ptr));
+        ctor.set_data_meta(pos, PropAttributes::new(false, false, false));
+        ctor.bump_generation();
+    }
+
+    // name 槽 → "Event"（描述符 {f,f,t}）。
+    let si_name = sf.intern("name").0;
+    if sh.lookup_position(ctor.shape_id(), si_name).is_none() {
+        let shape = sh.make_shape(ctor.shape_id(), si_name);
+        ctor.set_shape_id(shape);
+        ctor.ensure_hash_props()
+            .push(JsValue::perm_string(sf.string_ptr(sf.intern("Event").0)));
+        let pos = ctor.hash_props_vec().map_or(0, |v| v.len() as u32).saturating_sub(1);
+        ctor.set_data_meta(pos, PropAttributes::new(false, false, true));
+        ctor.bump_generation();
+    }
+
+    // [[Prototype]] → Function.prototype（幂等，裸写槽）。
+    let fn_proto_val = JsValue::from_js_object(world.function_proto.as_ptr() as *mut JsObject);
+    let _ = ctor.set_proto(fn_proto_val);
+
+    configure_native_constructor(ctor, oxide_builtins::event::event_constructor::<crate::vm::Vm> as *const (), 2);
+    bind_constructor!(
+        core,
+        global,
+        "Event",
+        ctor_ptr,
+        oxide_builtins::event::event_constructor::<crate::vm::Vm>,
+        2,
+        hash: true
+    );
+
+    // Event 常量：CAPTURING_PHASE / AT_TARGET / BUBBLING_PHASE（绑构造器，
+    // 描述符 {t,f,t}）。
+    let constants: [(&str, i32); 3] = [("CAPTURING_PHASE", 1), ("AT_TARGET", 2), ("BUBBLING_PHASE", 3)];
+    for (name, value) in constants {
+        let si = sf.intern(name).0;
+        if sh.lookup_position(ctor.shape_id(), si).is_none() {
+            let shape = sh.make_shape(ctor.shape_id(), si);
+            ctor.set_shape_id(shape);
+            let pos = ctor.push_prop(JsValue::int(value));
+            ctor.set_data_meta(pos, PropAttributes::new(true, false, true));
+            ctor.bump_generation();
+        }
+    }
+
+    // ---- 填原型占位 ----
+    // constructor 槽 → 构造器对象（描述符 {t,f,t}）。
+    let si_constructor = sf.intern("constructor").0;
+    if sh.lookup_position(proto.shape_id(), si_constructor).is_none() {
+        let shape = sh.make_shape(proto.shape_id(), si_constructor);
+        proto.set_shape_id(shape);
+        let pos = proto.push_prop(JsValue::from_js_object(ctor_ptr));
+        proto.set_data_meta(pos, PropAttributes::new(true, false, true));
+        proto.bump_generation();
+    }
+
+    // [[Prototype]] → Object.prototype（幂等，裸写槽）。
+    let object_proto_val = JsValue::from_js_object(world.object_proto.as_ptr() as *mut JsObject);
+    let _ = proto.set_proto(object_proto_val);
+
+    // 原型方法：preventDefault / stopPropagation / stopImmediatePropagation /
+    // composedPath（每方法先 lookup_position 守卫）。
+    let si_prevent_default = sf.intern("preventDefault").0;
+    if sh.lookup_position(proto.shape_id(), si_prevent_default).is_none() {
+        apply_binding_table(
+            world,
+            proto,
+            core,
+            &[
+                (
+                    "preventDefault",
+                    oxide_builtins::event::event_prevent_default::<crate::vm::Vm> as *const (),
+                    0,
+                ),
+                (
+                    "stopPropagation",
+                    oxide_builtins::event::event_stop_propagation::<crate::vm::Vm> as *const (),
+                    0,
+                ),
+                (
+                    "stopImmediatePropagation",
+                    oxide_builtins::event::event_stop_immediate_propagation::<crate::vm::Vm> as *const (),
+                    0,
+                ),
+                (
+                    "composedPath",
+                    oxide_builtins::event::event_composed_path::<crate::vm::Vm> as *const (),
+                    0,
+                ),
+            ],
+        );
+    }
+
+    // 原型 getter：type / target / currentTarget / eventPhase / isTrusted /
+    // bubbles / cancelable / defaultPrevented / composed（每 getter 先
+    // lookup_position 守卫）。
+    let getter_fns: [(&str, *const ()); 9] = [
+        ("type", oxide_builtins::event::event_type_getter::<crate::vm::Vm> as *const ()),
+        ("target", oxide_builtins::event::event_target_getter::<crate::vm::Vm> as *const ()),
+        (
+            "currentTarget",
+            oxide_builtins::event::event_current_target_getter::<crate::vm::Vm> as *const (),
+        ),
+        ("eventPhase", oxide_builtins::event::event_phase_getter::<crate::vm::Vm> as *const ()),
+        ("isTrusted", oxide_builtins::event::event_is_trusted_getter::<crate::vm::Vm> as *const ()),
+        ("bubbles", oxide_builtins::event::event_bubbles_getter::<crate::vm::Vm> as *const ()),
+        ("cancelable", oxide_builtins::event::event_cancelable_getter::<crate::vm::Vm> as *const ()),
+        (
+            "defaultPrevented",
+            oxide_builtins::event::event_default_prevented_getter::<crate::vm::Vm> as *const (),
+        ),
+        ("composed", oxide_builtins::event::event_composed_getter::<crate::vm::Vm> as *const ()),
+    ];
+    for (name, fn_ptr) in getter_fns {
+        let si = sf.intern(name).0;
+        if sh.lookup_position(proto.shape_id(), si).is_none() {
+            bind_accessor_getter(core, session, proto, name, fn_ptr);
+        }
+    }
+}

crates/oxide_vm/src/native_box_dispatch.rs

@@ -1,7 +1,7 @@
 //! native 载荷家族的单点分类与每家族边函数引用（家族表）。
 //!
 //! 分类是复合谓词：header 位（map/set/module_ns）优先于 `type_tag`，
-//! 两维互斥、一个对象至多归入一个家族。tag 维显式枚举全部 0..=34，
+//! 两维互斥、一个对象至多归入一个家族。tag 维显式枚举全部 0..=38，
 //! 未登记 tag panic。
 //!
 //! 关键约定：
@@ -10,13 +10,13 @@
 //! - 注册面集中在 `ops_for` 的家族表，mark/size/drop/clone/rewrite 各链
 //!   由同一张表驱动，新增家族只在此登记。
 
-use oxide_builtins::{data_view, disposable_stack, map, message_channel, module, set, typed_array, weak_map};
+use oxide_builtins::{data_view, disposable_stack, event, map, message_channel, module, set, typed_array, weak_map};
 use oxide_types::object::{Cell, JsObject, JsString};
 use oxide_types::value::JsValue;
 
 /// native 载荷家族。
 ///
-/// 15 个 native 家族 + 空家族；空家族是无 native 盒类型的显式归类结果。
+/// 21 个 native 家族 + 空家族；空家族是无 native 盒类型的显式归类结果。
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub(crate) enum NativeBoxFamily {
     /// 无 native 载荷盒。
@@ -53,6 +53,14 @@ pub(crate) enum NativeBoxFamily {
     MessagePort,
     /// BroadcastChannel 通道对象（tag 34，mpsc 发送/接收对与通道名，无对象边）。
     BroadcastChannel,
+    /// Event 事件基类对象（tag 35，type 串与九项状态位载荷盒）。
+    Event,
+    /// MessageEvent 事件派生类对象（tag 36，data 与 ports 边）。
+    MessageEvent,
+    /// ErrorEvent 事件派生类对象（tag 37，message 与 error 边）。
+    ErrorEvent,
+    /// CustomEvent 事件派生类对象（tag 38，detail 边）。
+    CustomEvent,
     /// mapped arguments 对象（tag 20，同步状态盒存 `native_data`，无引用边）。
     Arguments,
 }
@@ -87,7 +95,7 @@ pub(crate) fn classify(obj: &JsObject) -> NativeBoxFamily {
 /// 按类型 tag 分类 native 载荷家族。
 ///
 /// # 边界与前提
-/// - 0..=34 全 tag 显式枚举；未登记 tag（35 及以上）panic。
+/// - 0..=38 全 tag 显式枚举；未登记 tag（39 及以上）panic。
 pub(crate) fn classify_by_tag(tag: u8) -> NativeBoxFamily {
     match tag {
         JsObject::OBJ_TYPE_ARRAY_BUFFER => NativeBoxFamily::ArrayBuffer,
@@ -126,6 +134,10 @@ pub(crate) fn classify_by_tag(tag: u8) -> NativeBoxFamily {
         JsObject::OBJ_TYPE_RAW_JSON => NativeBoxFamily::None,
         JsObject::OBJ_TYPE_MESSAGE_PORT => NativeBoxFamily::MessagePort,
         JsObject::OBJ_TYPE_BROADCAST_CHANNEL => NativeBoxFamily::BroadcastChannel,
+        JsObject::OBJ_TYPE_EVENT => NativeBoxFamily::Event,
+        JsObject::OBJ_TYPE_MESSAGE_EVENT => NativeBoxFamily::MessageEvent,
+        JsObject::OBJ_TYPE_ERROR_EVENT => NativeBoxFamily::ErrorEvent,
+        JsObject::OBJ_TYPE_CUSTOM_EVENT => NativeBoxFamily::CustomEvent,
         _ => panic!("unregistered type tag: {tag}"),
     }
 }
@@ -223,6 +235,19 @@ pub(crate) fn ops_for(family: NativeBoxFamily) -> NativeBoxOps {
             string_edges: None,
             cell_edges: None,
         },
+        // Event 基类载荷盒：type 串边与 target / current_target 对象边。
+        NativeBoxFamily::Event => NativeBoxOps {
+            object_edges: Some(event::event_native_edges),
+            string_edges: None,
+            cell_edges: None,
+        },
+        // 事件派生类（MessageEvent / ErrorEvent / CustomEvent）载荷盒由后续子
+        // 任务填充；本臂当前无引用边，仅 size/drop 链消费。
+        NativeBoxFamily::MessageEvent | NativeBoxFamily::ErrorEvent | NativeBoxFamily::CustomEvent => NativeBoxOps {
+            object_edges: None,
+            string_edges: None,
+            cell_edges: None,
+        },
         // mapped arguments 同步状态盒：无引用边（位图与帧身份均为原始值），
         // 三边函数全空，仅 size/drop 链消费。
         NativeBoxFamily::Arguments => NativeBoxOps {
@@ -261,6 +286,10 @@ mod tests {
             JsObject::OBJ_TYPE_REGEXP | JsObject::OBJ_TYPE_REGEX_STUB => NativeBoxFamily::RegExp,
             JsObject::OBJ_TYPE_MESSAGE_PORT => NativeBoxFamily::MessagePort,
             JsObject::OBJ_TYPE_BROADCAST_CHANNEL => NativeBoxFamily::BroadcastChannel,
+            JsObject::OBJ_TYPE_EVENT => NativeBoxFamily::Event,
+            JsObject::OBJ_TYPE_MESSAGE_EVENT => NativeBoxFamily::MessageEvent,
+            JsObject::OBJ_TYPE_ERROR_EVENT => NativeBoxFamily::ErrorEvent,
+            JsObject::OBJ_TYPE_CUSTOM_EVENT => NativeBoxFamily::CustomEvent,
             JsObject::OBJ_TYPE_ARGUMENTS => NativeBoxFamily::Arguments,
             _ => NativeBoxFamily::None,
         }
@@ -268,7 +297,7 @@ mod tests {
 
     #[test]
     fn tag_dimension_every_tag_hits_exactly_one_family() {
-        for tag in 0..=34u8 {
+        for tag in 0..=38u8 {
             let obj = obj_with_tag(tag);
             let family = classify(&obj);
             assert_eq!(family, expected_family_for_tag(tag), "tag {tag} 家族不一致");
@@ -302,7 +331,7 @@ mod tests {
     #[test]
     #[should_panic(expected = "unregistered type tag")]
     fn unregistered_tag_panics() {
-        let obj = obj_with_tag(35);
+        let obj = obj_with_tag(39);
         classify(&obj);
     }
 }

crates/oxide_vm/src/session_gc.rs

@@ -11,7 +11,7 @@ use crate::native_box_dispatch;
 use crate::vm::RootGroup;
 use crate::vm::Vm;
 use oxide_builtins::{
-    array_buffer, broadcast_channel, data_view, disposable_stack, map, message_channel, module, regexp, set,
+    array_buffer, broadcast_channel, data_view, disposable_stack, event, map, message_channel, module, regexp, set,
     typed_array, weak_map,
 };
 
@@ -132,6 +132,7 @@ impl SessionGc {
         bytes += weak_map::weak_map_native_size(obj);
         bytes += message_channel::message_port_native_size(obj);
         bytes += broadcast_channel::broadcast_channel_native_size(obj);
+        bytes += event::event_native_size(obj);
         bytes += crate::arguments_gc::arguments_native_size(obj);
 
         bytes
@@ -375,6 +376,14 @@ impl SessionGc {
                 Self::mark_string_live(live, obj.get_regexp_flags().as_string_ptr_mut());
             }
         }
+        // Event 载荷盒 type 字段持有字符串边。
+        if obj.is_event_obj() {
+            for value in event::event_native_edges(obj) {
+                if value.is_string() {
+                    Self::mark_string_live(live, value.as_string_ptr_mut());
+                }
+            }
+        }
     }
 
     /// 从 VM roots 标记存活 session 对象、字符串与 BigInt，供 `sweep` 判定。
@@ -574,6 +583,7 @@ impl SessionGc {
             freed_bytes += weak_map::drop_weak_map_native(obj);
             freed_bytes += message_channel::drop_message_port_native(obj);
             freed_bytes += broadcast_channel::drop_broadcast_channel_native(obj);
+            freed_bytes += event::drop_event_native(obj);
             freed_bytes += crate::arguments_gc::drop_arguments_native(obj);
 
             freed_bytes