feat: 实现最小 BigInt 子集（字面量/算术/比较/构造器，Temporal 前置）

crates/oxide_vm/src/bindings/bind_bigint.rs

@@ -0,0 +1,33 @@
+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::value::JsValue;
+
+/// 把 BigInt 构造器与原型方法绑定到 global。
+///
+/// 构造器/原型对象由 `BuiltinWorld` 创建（含 name/prototype/constructor 互指），
+/// 这里只配置 native 实现并挂方法。`BigInt(value)` 当函数调用时返回 BigInt 值；
+/// `new BigInt()` 抛 TypeError（BigInt 不可 new）。
+pub fn bind_bigint(core: &Arc<KernelCore>, session: &KernelSession, global: &mut JsObject) {
+    let world = session.builtin_world();
+    let ctor_ptr = world.bigint_constructor.as_ptr() as *mut JsObject;
+    let ctor = unsafe { &mut *ctor_ptr };
+    let proto_ptr = world.bigint_proto.as_ptr() as *mut JsObject;
+    let proto = unsafe { &mut *proto_ptr };
+
+    configure_native_constructor(ctor, oxide_builtins::bigint::bigint_constructor::<crate::vm::Vm> as *const (), 1);
+
+    apply_binding_table(
+        world,
+        proto,
+        core,
+        &[
+            ("toString", oxide_builtins::bigint::bigint_to_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));
+}

crates/oxide_vm/src/bindings/bind_stubs.rs

@@ -8,9 +8,8 @@ use oxide_types::value::JsValue;
 
 use crate::bindings::{bind_global_value, configure_native_constructor};
 
-const STUBS: [(&str, *const (), u8); 8] = [
+const STUBS: [(&str, *const (), u8); 7] = [
     ("Proxy", oxide_builtins::stubs::proxy_stub::<crate::vm::Vm> as *const (), 2),
-    ("BigInt", oxide_builtins::stubs::bigint_stub::<crate::vm::Vm> as *const (), 1),
     ("WeakMap", oxide_builtins::stubs::weakmap_stub::<crate::vm::Vm> as *const (), 0),
     ("WeakSet", oxide_builtins::stubs::weakset_stub::<crate::vm::Vm> as *const (), 0),
     ("WeakRef", oxide_builtins::stubs::weakref_stub::<crate::vm::Vm> as *const (), 1),
@@ -27,7 +26,7 @@ const STUBS: [(&str, *const (), u8); 8] = [
     ("Atomics", oxide_builtins::stubs::atomics_stub::<crate::vm::Vm> as *const (), 0),
 ];
 
-/// 把未实现内置（Proxy/BigInt/WeakMap/WeakSet/WeakRef/FinalizationRegistry/SharedArrayBuffer/Atomics）
+/// 把未实现内置（Proxy/WeakMap/WeakSet/WeakRef/FinalizationRegistry/SharedArrayBuffer/Atomics）
 /// 的 stub 构造器绑定到 global，并登记到 `stub_objects` 供快照跟踪。
 pub fn bind_stubs(core: &Arc<KernelCore>, session: &mut KernelSession, global: &mut JsObject) {
     let builtin_world = Arc::get_mut(&mut session.builtin_world)

crates/oxide_vm/src/bindings/mod.rs

@@ -6,6 +6,8 @@
 pub mod bind_array;
 /// ArrayBuffer 构造器与原型的 native 方法绑定。
 pub mod bind_array_buffer;
+/// BigInt 构造器与原型的 native 方法绑定。
+pub mod bind_bigint;
 /// Boolean 构造器与原型的 native 方法绑定。
 pub mod bind_boolean;
 /// DataView 构造器与原型的 native 方法绑定。
@@ -371,7 +373,6 @@ fn bind_iterator_global(core: &Arc<KernelCore>, session: &KernelSession, global:
 fn bind_stub_globals(core: &Arc<KernelCore>, session: &KernelSession, global: &mut JsObject) {
     for (index, (name, native_fn, arg_count)) in [
         ("Proxy", oxide_builtins::stubs::proxy_stub::<crate::vm::Vm> as *const (), 2),
-        ("BigInt", oxide_builtins::stubs::bigint_stub::<crate::vm::Vm> as *const (), 1),
         ("WeakMap", oxide_builtins::stubs::weakmap_stub::<crate::vm::Vm> as *const (), 0),
         ("WeakSet", oxide_builtins::stubs::weakset_stub::<crate::vm::Vm> as *const (), 0),
         ("WeakRef", oxide_builtins::stubs::weakref_stub::<crate::vm::Vm> as *const (), 1),
@@ -603,6 +604,7 @@ pub fn bind_global_builtin_slots(core: &Arc<KernelCore>, session: &KernelSession
     bind_reflect_global(core, session, global);
     bind_iterator_global(core, session, global);
     bind_stub_globals(core, session, global);
+    bind_bigint::bind_bigint(core, session, global);
     bind_global_functions(core, session, global);
     let global_this = JsValue::from_js_object(global as *mut JsObject);
     bind_existing_global(core, global, "globalThis", global_this);
@@ -674,6 +676,9 @@ pub fn rebind_dirty_builtins(core: &Arc<KernelCore>, session: &mut KernelSession
     if dirty.map_or(true, |d| d.stubs) {
         bind_stubs::bind_stubs(core, session, global);
     }
+    if dirty.map_or(true, |d| d.stubs) {
+        bind_bigint::bind_bigint(core, session, global);
+    }
 }
 
 /// 完整初始化一个 session 的内置对象（全量绑定 + `globalThis` + 快照记录）。