From 6a9ae54e5d0ebb6f09f2056c94ccc5b7158e9c37 Mon Sep 17 00:00:00 2001
From: pjh456 <147148383@qq.com>
Date: Sat, 26 Sep 2026 16:58:12 +0000
Subject: [PATCH] =?UTF-8?q?perf:=20native=20=E5=90=8C=E6=AD=A5=E8=B0=83?=
 =?UTF-8?q?=E7=94=A8=E5=AE=9E=E5=8F=82=E6=89=93=E5=8C=85=E6=94=B9=E6=A0=88?=
 =?UTF-8?q?=E5=86=85=20SmallVec=20=E5=85=8D=E5=A0=86=E5=88=86=E9=85=8D?=
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---
 crates/oxide_vm/src/vm/call.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/crates/oxide_vm/src/vm/call.rs b/crates/oxide_vm/src/vm/call.rs
index bec3a5dc..ce105e25 100644
--- a/crates/oxide_vm/src/vm/call.rs
+++ b/crates/oxide_vm/src/vm/call.rs
@@ -6,6 +6,7 @@ use std::sync::Arc;
 use oxide_runtime_api::NativeResult;
 use oxide_types::object::JsObject;
 use oxide_types::value::JsValue;
+use smallvec::SmallVec;
 
 use super::frames::{CallFrame, FrameArgs, FrameContinuation};
 use super::{native_fn_ptr_to_fn, Vm};
@@ -13,11 +14,14 @@ use crate::native::NativeFn;
 use crate::{vm_debug, vm_trace};
 
 impl Vm {
-    fn pack_sync_native_call_args(&mut self, receiver: JsValue, callee: JsValue, args: &[JsValue]) -> Vec<u8> {
+    fn pack_sync_native_call_args(
+        &mut self, receiver: JsValue, callee: JsValue, args: &[JsValue],
+    ) -> SmallVec<[u8; 256]> {
         self.regs[253] = receiver;
         self.regs[254] = callee;
 
-        let mut arg_regs = Vec::with_capacity(args.len() + 1);
+        // 实参寄存器号列表容量恒 ≤ 254（253 实参 + receiver），栈内缓冲免每次 native 调用堆分配。
+        let mut arg_regs = SmallVec::new();
         arg_regs.push(253);
         for (idx, arg) in args.iter().enumerate() {
             let reg = (Self::SYNC_NATIVE_ARG_BASE + idx) as u8;