feat: BigInt constructor ToPrimitive semantics, toString(radix), asIntN/asUintN; ctor [[Prototype]]=Function.prototype

crates/oxide_vm/src/bindings/bind_bigint.rs

@@ -2,7 +2,7 @@ use std::sync::Arc;
 
 use crate::bindings::{apply_binding_table, bind_global_value, 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;
 
 /// 把 BigInt 构造器与原型方法绑定到 global。
@@ -18,6 +18,24 @@ pub fn bind_bigint(core: &Arc<KernelCore>, session: &KernelSession, global: &mut
     let proto = unsafe { &mut *proto_ptr };
 
     configure_native_constructor(ctor, oxide_builtins::bigint::bigint_constructor::<crate::vm::Vm> as *const (), 1);
+    // BigInt.length = 1，属性 { [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }。
+    let length_si = core.perm_interner().intern("length").0;
+    let length_shape = core.shape_forge().make_shape(ctor.shape_id(), length_si);
+    ctor.set_shape_id(length_shape);
+    ctor.ensure_hash_props().push(JsValue::int(1));
+    let length_pos = ctor.hash_props_vec().map_or(0, |v| v.len() as u32).saturating_sub(1);
+    ctor.set_data_meta(length_pos, PropAttributes::new(false, false, true));
+
+    // 静态方法：asIntN / asUintN（length 均为 2）。
+    apply_binding_table(
+        world,
+        ctor,
+        core,
+        &[
+            ("asIntN", oxide_builtins::bigint::bigint_as_int_n::<crate::vm::Vm> as *const (), 2),
+            ("asUintN", oxide_builtins::bigint::bigint_as_uint_n::<crate::vm::Vm> as *const (), 2),
+        ],
+    );
 
     apply_binding_table(
         world,
@@ -25,9 +43,15 @@ pub fn bind_bigint(core: &Arc<KernelCore>, session: &KernelSession, global: &mut
         core,
         &[
             ("toString", oxide_builtins::bigint::bigint_to_string::<crate::vm::Vm> as *const (), 0),
+            ("toLocaleString", oxide_builtins::bigint::bigint_to_locale_string::<crate::vm::Vm> as *const (), 0),
             ("valueOf", oxide_builtins::bigint::bigint_value_of::<crate::vm::Vm> as *const (), 0),
         ],
     );
 
     bind_global_value(core, global, "BigInt", JsValue::from_js_object(ctor_ptr));
+    // 全局 BigInt 属性描述符：{ writable: true, enumerable: false, configurable: true }。
+    let bigint_si = core.perm_interner().intern("BigInt").0;
+    if let Some(pos) = core.shape_forge().lookup_position(global.shape_id(), bigint_si) {
+        global.set_data_meta(pos, PropAttributes::new(true, false, true));
+    }
 }