From 18642a9c2335ff86111054b80cabab3d8a29201a Mon Sep 17 00:00:00 2001
From: TermiNexus <wyt18222152539wyt@163.com>
Date: Wed, 26 Aug 2026 20:35:14 +0800
Subject: [PATCH] =?UTF-8?q?debug(llvmlite):=20function=5Fset=5Fattrs=20?=
 =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E8=B0=83=E7=94=A8=E8=AF=8A=E6=96=AD=EF=BC=8C?=
 =?UTF-8?q?=E7=A1=AE=E8=AE=A4=E5=B1=9E=E6=80=A7=E6=98=AF=E5=90=A6=E5=86=99?=
 =?UTF-8?q?=E5=85=A5=E5=87=BD=E6=95=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 llvmlite/__function.vp | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/llvmlite/__function.vp b/llvmlite/__function.vp
index 18a963b..048356f 100644
--- a/llvmlite/__function.vp
+++ b/llvmlite/__function.vp
@@ -301,6 +301,11 @@ def block_insert_text_before_terminator(pool: memhub.MemBuddy | t.CPtr,
 def function_set_attrs(func: Function | t.CPtr, attrs: t.CChar | t.CPtr):
     """设置函数级属性文本（如 "nounwind"/"noinline"）"""
     if func is None: return
+    # [ATTR-DIAG] 确认 function_set_attrs 是否被调用及传入内容
+    if attrs is not None:
+        stdio.printf("[ATTR] function_set_attrs: func='%s' attrs='%s'\n", func.Name, attrs)
+    else:
+        stdio.printf("[ATTR] function_set_attrs: func='%s' attrs=None\n", func.Name)
     func.Attrs = attrs
 
 
@@ -785,10 +790,25 @@ def FunctionPrint(buf: t.CChar | t.CPtr, size: t.CSizeT,
 # ============================================================
 # 内部辅助
 # ============================================================
+# _append_cstr 写入位置缓存（性能优化：同一缓冲连续追加时 O(1) 定位，
+# 避免每次 strlen(dst) 从头扫描导致的 O(n²) —— IR 序列化热点）。
+# 缓冲切换（dst 不同）或缓冲被重置（dst[0]=0 且 pos>0）时自动回退 strlen。
+_g_last_dst: t.CUInt64T = 0
+_g_last_pos: t.CSizeT = 0
+
 def _append_cstr(dst: t.CChar | t.CPtr, dst_size: t.CSizeT, src: t.CChar | t.CPtr):
     """将 C 字符串 src 追加到 dst 末尾"""
+    global _g_last_dst, _g_last_pos
     if dst is None or src is None: return
-    dlen: t.CSizeT = string.strlen(dst)
+    dlen: t.CSizeT = 0
+    if _g_last_dst == t.CUInt64T(dst):
+        dlen = _g_last_pos
+        # 缓冲被重置（调用方 buf[0]=0 后复用同一地址）→ 回到头部
+        if dlen > 0 and dst[0] == '\0':
+            dlen = 0
+    else:
+        dlen = string.strlen(dst)
+        _g_last_dst = t.CUInt64T(dst)
     # 无符号下溢防护：dlen 超过缓冲大小时（缓冲已被破坏/悬空）直接返回，
     # 否则 remain = dst_size - dlen 下溢成巨值会把 dst[dlen+i] 写穿到缓冲外
     if dlen >= dst_size:
@@ -801,6 +821,7 @@ def _append_cstr(dst: t.CChar | t.CPtr, dst_size: t.CSizeT, src: t.CChar | t.CPt
         dst[dlen + i] = src[i]
         i += 1
     dst[dlen + i] = '\0'
+    _g_last_pos = dlen + i
 
 
 # ============================================================