diff --git a/lldb/tools/lldb-vscode/JSONUtils.cpp b/lldb/tools/lldb-vscode/JSONUtils.cpp
--- a/lldb/tools/lldb-vscode/JSONUtils.cpp
+++ b/lldb/tools/lldb-vscode/JSONUtils.cpp
@@ -762,8 +762,14 @@
   const char *func_name = frame.GetFunctionName();
   if (func_name)
     frame_name = func_name;
-  else
-    frame_name = "<unknown>";
+  else {
+    // If the function name is unavailable, display the pc address as a 16-digit
+    // hex string.
+    frame_name.clear();
+    llvm::raw_string_ostream os(frame_name);
+    os << llvm::format_hex(frame.GetPC(), 18);
+    os.flush();
+  }
   bool is_optimized = frame.GetFunction().GetIsOptimized();
   if (is_optimized)
     frame_name += " [opt]";