From 62426e94ef11fd6baa213757f87114ec174b406e Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Tue, 28 Nov 2023 09:15:31 -0800
Subject: Misc language server fixes. (#3357)

---
 source/slang/slang-language-server.cpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

(limited to 'source/slang/slang-language-server.cpp')

diff --git a/source/slang/slang-language-server.cpp b/source/slang/slang-language-server.cpp
index 24ab534ab..c188142f5 100644
--- a/source/slang/slang-language-server.cpp
+++ b/source/slang/slang-language-server.cpp
@@ -1255,8 +1255,20 @@ SlangResult LanguageServer::signatureHelp(
         return SLANG_OK;
     }
 
-    auto funcExpr =
-        appExpr->originalFunctionExpr ? appExpr->originalFunctionExpr : appExpr->functionExpr;
+    auto funcExpr = appExpr->functionExpr;
+    if (appExpr->originalFunctionExpr)
+    {
+        bool useOriginalExpr = true;
+        if (auto originalDeclRefExpr = as<DeclRefExpr>(appExpr->originalFunctionExpr))
+        {
+            if (!originalDeclRefExpr->declRef)
+            {
+                useOriginalExpr = false;
+            }
+        }
+        if (useOriginalExpr)
+            funcExpr = appExpr->originalFunctionExpr;
+    }
     if (!funcExpr)
     {
         m_connection->sendResult(NullResponse::get(), responseId);
-- 
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