fix: 修复转 object 产生野指针问题

crates/oxide_vm/tests/value_tests.rs

@@ -91,6 +91,39 @@ fn object_pointer_roundtrip() {
     assert_eq!(ptr, &x as *const u8);
 }
 
+#[test]
+fn as_ptr_non_object_returns_null() {
+    assert!(JsValue::int(0).as_ptr().is_null());
+    assert!(JsValue::float(0.0).as_ptr().is_null());
+    assert!(JsValue::bool(true).as_ptr().is_null());
+    assert!(JsValue::null().as_ptr().is_null());
+    assert!(JsValue::undefined().as_ptr().is_null());
+    let x = 42u8;
+    assert!(!JsValue::object(&x as *const u8).as_ptr().is_null());
+}
+
+#[test]
+fn as_object_ptr_non_object_returns_null() {
+    assert!(JsValue::int(0).as_object_ptr().is_null());
+    assert!(JsValue::float(0.0).as_object_ptr().is_null());
+    assert!(JsValue::bool(true).as_object_ptr().is_null());
+    assert!(JsValue::null().as_object_ptr().is_null());
+    assert!(JsValue::undefined().as_object_ptr().is_null());
+    let x = 42u8;
+    assert!(!JsValue::object(&x as *const u8).as_object_ptr().is_null());
+}
+
+#[test]
+fn as_js_object_ptr_non_object_returns_null() {
+    assert!(JsValue::int(0).as_js_object_ptr().is_null());
+    assert!(JsValue::float(0.0).as_js_object_ptr().is_null());
+    assert!(JsValue::bool(true).as_js_object_ptr().is_null());
+    assert!(JsValue::null().as_js_object_ptr().is_null());
+    assert!(JsValue::undefined().as_js_object_ptr().is_null());
+    let x = 42u8;
+    assert!(!JsValue::object(&x as *const u8).as_js_object_ptr().is_null());
+}
+
 #[test]
 fn display_int() {
     assert_eq!(format!("{}", JsValue::int(42)), "42");