From 95681bfad48b508fafec3e3f96ae52287e567dd2 Mon Sep 17 00:00:00 2001
From: Geoffrey White <40627776+geoffw0@users.noreply.github.com>
Date: Mon, 9 Mar 2026 15:06:20 +0000
Subject: [PATCH] Rust: Fix performance issue with File.fromSource.

---
 rust/ql/lib/codeql/files/FileSystem.qll | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/rust/ql/lib/codeql/files/FileSystem.qll b/rust/ql/lib/codeql/files/FileSystem.qll
index cfab33b9a440..367f088504b4 100644
--- a/rust/ql/lib/codeql/files/FileSystem.qll
+++ b/rust/ql/lib/codeql/files/FileSystem.qll
@@ -45,13 +45,16 @@ extensible predicate additionalExternalFile(string relativePath);
 
 /** A file. */
 class File extends Container, Impl::File {
+  pragma[nomagic]
+  private string getRelativePath0() { result = this.getRelativePath() }
+
   /**
    * Holds if this file was extracted from the source code of the target project
    * (rather than another location such as inside a dependency).
    */
   predicate fromSource() {
     exists(ExtractorStep s | s.getAction() = "Extract" and s.getFile() = this) and
-    not additionalExternalFile(this.getRelativePath())
+    not additionalExternalFile(this.getRelativePath0())
   }
 
   /**