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feat: 共享 ThrowTypeError 对象并拆分 arguments callee 四象限

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彭俊皓
2026-09-26 15:01:50 +00:00
parent d773cc7282
commit de236fb5d1
11 changed files with 138 additions and 67 deletions
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crates/oxide_vm/src/bindings/bind_function.rs
+27 -16
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@@ -66,8 +66,14 @@ pub fn bind_function(core: &Arc<KernelCore>, session: &KernelSession, global: &m
}
/// 在 Function.prototype 上绑定 caller/arguments 受限访问器：两属性的
/// get/set 共用同一 %ThrowTypeError% 函数对象（name="get caller"、length=0），
/// 描述符 { enumerable:false, configurable:true }。
/// get/set 共用同一 %ThrowTypeError% 函数对象（匿名、length=0、冻结、
/// 不可扩展），描述符 { enumerable:false, configurable:true }。
///
/// # 步骤
/// 1. 取共享 %ThrowTypeError% 对象：选择性重建复用（同键旧对象迁移），
/// 未命中时新建（length 先于 name、描述符三标志全 false）。
/// 2. 对象指针写入 world Cell（运行期创建 arguments 对象时读取，跨形态恒等）。
/// 3. 为 caller/arguments 各开 shape 槽位并写入访问器 meta。
///
/// # 副作用
/// - 为 caller/arguments 各开 shape 槽位并写入访问器 meta；thrower 函数对象
@@ -81,14 +87,13 @@ fn bind_function_proto_restricted(core: &Arc<KernelCore>, session: &KernelSessio
let si_length = string_forge.intern("length").0;
let si_caller = string_forge.intern("caller").0;
let si_arguments = string_forge.intern("arguments").0;
let si_label = string_forge.intern("get caller").0;
let si_label = string_forge.intern("ThrowTypeError").0;
// 构造单一 thrower 函数对象，供两属性 get/set 共用（选择性重建复用：
// 同家族同槽旧 thrower 迁移到新 proto 的访问器槽，不再新建对象）。
// 取共享 %ThrowTypeError% 对象，供两属性 get/set 与 unmapped arguments.callee
// 访问器共用（选择性重建复用：同键旧对象迁移，不新建，跨形态恒等）。
// SAFETY: thrower 函数项指针转为 *const ()。
let thrower_fn_ptr = unsafe {
NativeFnPtr::from_raw(oxide_builtins::function::function_restricted_thrower::<crate::vm::Vm> as *const ())
};
let thrower_fn_ptr =
unsafe { NativeFnPtr::from_raw(oxide_builtins::function::throw_type_error::<crate::vm::Vm> as *const ()) };
let reuse_key = FnWrapperKey::new(family, si_label, si_caller, si_name);
let thrower_ptr = match world.find_fn_wrapper(reuse_key, thrower_fn_ptr, 0) {
Some(ptr) => ptr,
@@ -98,23 +103,29 @@ fn bind_function_proto_restricted(core: &Arc<KernelCore>, session: &KernelSessio
thrower.set_function(true);
thrower.set_native_fn(Some(thrower_fn_ptr));
thrower.set_native_arg_count(0);
let name_shape = shape_forge.make_shape(thrower.shape_id(), si_name);
thrower.set_shape_id(name_shape);
thrower
.ensure_hash_props()
.push(JsValue::perm_string(string_forge.string_ptr(si_label)));
let name_pos = thrower.hash_props_vec().map_or(0, |v| v.len() as u32).saturating_sub(1);
thrower.set_data_meta(name_pos, PropAttributes::new(false, false, true));
// length 先于 name（ownNames 序 ["length","name"]），描述符
// { writable:false, enumerable:false, configurable:false }。
let length_shape = shape_forge.make_shape(thrower.shape_id(), si_length);
thrower.set_shape_id(length_shape);
thrower.ensure_hash_props().push(JsValue::int(0));
let length_pos = thrower.hash_props_vec().map_or(0, |v| v.len() as u32).saturating_sub(1);
thrower.set_data_meta(length_pos, PropAttributes::new(false, false, true));
thrower.set_data_meta(length_pos, PropAttributes::new(false, false, false));
let name_shape = shape_forge.make_shape(thrower.shape_id(), si_name);
thrower.set_shape_id(name_shape);
thrower
.ensure_hash_props()
.push(JsValue::perm_string(string_forge.string_ptr(string_forge.intern("").0)));
let name_pos = thrower.hash_props_vec().map_or(0, |v| v.len() as u32).saturating_sub(1);
thrower.set_data_meta(name_pos, PropAttributes::new(false, false, false));
thrower.set_extensible(false);
thrower.set_frozen(true);
let ptr = Box::into_raw(thrower);
world.track_fn_wrapper(ptr, reuse_key);
ptr
}
};
// 指针写入 world Cell：运行期创建 arguments 对象时读取，保证跨形态恒等。
world.throw_type_error.set(thrower_ptr);
let thrower_val = JsValue::from_js_object(thrower_ptr);
let attrs = PropAttributes::new(false, false, true);
for key in [si_caller, si_arguments] {