tracking of optimization information associated with expressions

src/script_opt/ExprOptInfo.h

@@ -0,0 +1,17 @@
+// See the file "COPYING" in the main distribution directory for copyright.
+
+// Auxiliary information associated with expressions to aid script
+// optimization.
+
+#pragma once
+
+namespace zeek::detail {
+
+class ExprOptInfo {
+public:
+	// The AST number of the statement in which this expression
+	// appears.
+	int stmt_num = -1;	// -1 = not assigned yet
+};
+
+} // namespace zeek::detail