feat: 支持 to_string 与错误栈

crates/oxide_vm/src/builtins/error.rs

@@ -116,3 +116,31 @@ pub fn eval_error_constructor(vm: &mut Vm, args: &[u8]) -> NativeResult {
     let proto_ptr = P::as_ptr(&vm.kernel().builtin_world().eval_error_proto) as *mut JsObject;
     Ok(create_error_object(vm, proto_ptr, "EvalError", &msg))
 }
+
+pub fn error_to_string(vm: &mut Vm, args: &[u8]) -> NativeResult {
+    let this_val = vm.reg(args[0]);
+    let (name, msg) = if this_val.is_object() {
+        let obj = unsafe { &*this_val.as_js_object_ptr() };
+        let name_val = obj.hash_props_vec().and_then(|v| v.first()).map(|b| **b).unwrap_or(JsValue::undefined());
+        let msg_val = obj.hash_props_vec().and_then(|v| v.get(1)).map(|b| **b).unwrap_or(JsValue::undefined());
+        (vm.lookup_str(name_val).unwrap_or_else(|| "Error".to_string()),
+         vm.lookup_str(msg_val).unwrap_or_default())
+    } else {
+        ("Error".to_string(), String::new())
+    };
+    let result = if msg.is_empty() { name } else { format!("{}: {}", name, msg) };
+    let si = vm.kernel().string_forge().intern(&result).0;
+    Ok(JsValue::string(si, 0))
+}
+
+pub fn error_stack_getter(vm: &mut Vm, _args: &[u8]) -> NativeResult {
+    let mut lines = vec![];
+    for frame in vm.frames.iter().rev() {
+        let func_name = vm.kernel().string_forge().lookup(frame.function_name).unwrap_or_else(|| "<anonymous>".to_string());
+        lines.push(format!("    at {} (native)", func_name));
+    }
+    lines.push("    at <anonymous> (native)".to_string());
+    let result = lines.join("\n");
+    let si = vm.kernel().string_forge().intern(&result).0;
+    Ok(JsValue::string(si, 0))
+}