feat: ArrayBuffer 三访问器与 markImmutable 及 detach 宿主真化

crates/oxide_vm/src/bindings/bind_array_buffer.rs

@@ -58,6 +58,11 @@ pub fn bind_array_buffer(core: &Arc<KernelCore>, session: &KernelSession, global
                 oxide_builtins::array_buffer::array_buffer_to_string::<crate::vm::Vm> as *const (),
                 0,
             ),
+            (
+                "markImmutable",
+                oxide_builtins::array_buffer::array_buffer_mark_immutable::<crate::vm::Vm> as *const (),
+                0,
+            ),
         ],
     );
 
@@ -79,6 +84,34 @@ pub fn bind_array_buffer(core: &Arc<KernelCore>, session: &KernelSession, global
         oxide_builtins::array_buffer::array_buffer_resizable::<crate::vm::Vm> as *const (),
     );
 
+    // maxByteLength 原型访问器（set 恒 undefined）：detached 回 +0，定长回
+    // 当前字节数，resizable 回存储态上限 − 1。
+    bind_accessor_getter(
+        core,
+        session,
+        proto,
+        "maxByteLength",
+        oxide_builtins::array_buffer::array_buffer_max_byte_length::<crate::vm::Vm> as *const (),
+    );
+
+    // immutable 原型访问器（set 恒 undefined）：读载荷 immutable 标志。
+    bind_accessor_getter(
+        core,
+        session,
+        proto,
+        "immutable",
+        oxide_builtins::array_buffer::array_buffer_immutable::<crate::vm::Vm> as *const (),
+    );
+
+    // detached 原型访问器（set 恒 undefined）：读载荷 data 存活位。
+    bind_accessor_getter(
+        core,
+        session,
+        proto,
+        "detached",
+        oxide_builtins::array_buffer::array_buffer_detached::<crate::vm::Vm> as *const (),
+    );
+
     bind_constructor!(
         core,
         global,

crates/oxide_vm/src/test262_host.rs

@@ -57,9 +57,11 @@ pub fn eval_script(vm: &mut Vm, args: &[u8]) -> NativeResult {
     }
 }
 
-/// `$262.detachArrayBuffer(buf)`：ArrayBuffer detach 未实现，抛能力缺失错误。
-pub fn detach_array_buffer(vm: &mut Vm, _args: &[u8]) -> NativeResult {
-    not_supported(vm, "detachArrayBuffer")
+/// `$262.detachArrayBuffer(buf)`：真 detach——品牌守卫后载荷 `data → None`，
+/// 返回 undefined。
+pub fn detach_array_buffer(vm: &mut Vm, args: &[u8]) -> NativeResult {
+    let this_val = if args.len() > 1 { vm.reg(args[1]) } else { JsValue::undefined() };
+    oxide_builtins::array_buffer::detach_array_buffer_native::<Vm>(vm, this_val)
 }
 
 /// `$262.createRealm()`：跨 realm 未支持，抛能力缺失错误。