From 47f54b89920e3962ba1f74d07dadbd6b6bf82083 Mon Sep 17 00:00:00 2001
From: Jake Hemstad <15221289+jrhemstad@users.noreply.github.com>
Date: Sun, 8 Mar 2026 20:26:20 -0500
Subject: [PATCH] Fix crash on include cursors without source file

Skip inclusion directives when clang_getFileLocation returns a null source_file handle (seen for built-in CUDA headers), preventing std::string construction from null while preserving normal include graph generation.
---
 src/include_graph_parser.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/include_graph_parser.cc b/src/include_graph_parser.cc
index 180508f..e106193 100644
--- a/src/include_graph_parser.cc
+++ b/src/include_graph_parser.cc
@@ -424,6 +424,12 @@ enum CXChildVisitResult inclusion_cursor_visitor(
         clang_getFileLocation(clang_getCursorLocation(cursor), &source_file,
             &line, &column, &offset);
 
+        if(source_file == nullptr) {
+            LOG(debug) << "WARNING: Cannot find source file for include text: "
+                       << get_raw_include_text(cursor);
+            return CXChildVisit_Continue;
+        }
+
         const std::string source_file_str{
             clang_getCString(clang_getFileName(source_file))};