Instantiate flow barriers from MaD

Author: owen-mc

rust/ql/lib/codeql/rust/dataflow/internal/ModelsAsData.qll

@@ -44,6 +44,7 @@
  */
 
 private import rust
+private import codeql.rust.dataflow.FlowBarrier
 private import codeql.rust.dataflow.FlowSummary
 private import codeql.rust.dataflow.FlowSource
 private import codeql.rust.dataflow.FlowSink
@@ -239,6 +240,22 @@ private class FlowSinkFromModel extends FlowSink::Range {
   }
 }
 
+private class FlowBarrierFromModel extends FlowBarrier::Range {
+  private string path;
+
+  FlowBarrierFromModel() {
+    barrierModel(path, _, _, _, _) and
+    this.callResolvesTo(path)
+  }
+
+  override predicate isBarrier(string output, string kind, Provenance provenance, string model) {
+    exists(QlBuiltins::ExtensionId madId |
+      barrierModel(path, output, kind, provenance, madId) and
+      model = "MaD:" + madId.toString()
+    )
+  }
+}
+
 private module Debug {
   private import FlowSummaryImpl
   private import Private