From 8ccb5c36b8f7e7c446fe4befe3bb7737b5dfb505 Mon Sep 17 00:00:00 2001
From: ValKmjolnir <lhk101lhk101@qq.com>
Date: Fri, 26 Sep 2025 22:37:38 +0800
Subject: [PATCH] :bug: fix segfault when callsite is empty

---
 src/nasal_vm.cpp                  | 5 +++++
 test/backtrace/empty_callsite.nas | 3 +++
 2 files changed, 8 insertions(+)
 create mode 100644 test/backtrace/empty_callsite.nas

diff --git a/src/nasal_vm.cpp b/src/nasal_vm.cpp
index 693a0be..6ad00f8 100644
--- a/src/nasal_vm.cpp
+++ b/src/nasal_vm.cpp
@@ -263,6 +263,11 @@ void vm::function_call_trace() {
     std::clog << " at " << files[bytecode[ctx.pc].fidx] << ":";
     std::clog << bytecode[ctx.pc].line << "\n";
 
+    if (callsite.empty()) {
+        cp.restore_code_page();
+        return;
+    }
+
     const nas_func* prev = nullptr;
     u64 prev_addr = 0;
     u64 same_call_count = 0;
diff --git a/test/backtrace/empty_callsite.nas b/test/backtrace/empty_callsite.nas
new file mode 100644
index 0000000..5debe84
--- /dev/null
+++ b/test/backtrace/empty_callsite.nas
@@ -0,0 +1,3 @@
+use std.math;
+
+math.clamp();
\ No newline at end of file