pkg/codesearch: support searching for references

Extend codesearch clang tool to export info about function references
(calls, takes-address-of).
Add pkg/codesearch command find-references.
Export find-references in pkg/aflow/tools/codesearcher to LLMs.

Update #6469

1 files changed, 34 insertions, 0 deletions

diff --git a/pkg/codesearch/testdata/refs.c b/pkg/codesearch/testdata/refs.c
new file mode 100644
index 000000000..9b6b2633f
--- /dev/null
+++ b/pkg/codesearch/testdata/refs.c
@@ -0,0 +1,34 @@
+// Copyright 2025 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+int refs0()
+{
+	return 0;
+}
+
+void refs1()
+{
+}
+
+void refs2(void (*)(), int)
+{
+}
+
+void refs3()
+{
+	refs2(refs1, refs0());
+	(void)refs2;
+}
+
+void long_func_with_ref()
+{
+	refs0();
+	refs1();
+	refs0();
+	refs1();
+	refs2(refs1, refs0());
+	refs0();
+	refs1();
+	refs0();
+	refs1();
+}