1 files changed, 49 insertions, 0 deletions
diff --git a/js/src/frontend/FoldConstants.h b/js/src/frontend/FoldConstants.h
new file mode 100644
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+++ b/js/src/frontend/FoldConstants.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef frontend_FoldConstants_h
+#define frontend_FoldConstants_h
+
+#include "frontend/SyntaxParseHandler.h"
+
+namespace js {
+namespace frontend {
+
+class FullParseHandler;
+template <class ParseHandler>
+class PerHandlerParser;
+
+// Perform constant folding on the given AST. For example, the program
+// `print(2 + 2)` would become `print(4)`.
+//
+// pnp is the address of a pointer variable that points to the root node of the
+// AST. On success, *pnp points to the root node of the new tree, which may be
+// the same node (unchanged or modified in place) or a new node.
+//
+// Usage:
+//    pn = parser->statement();
+//    if (!pn) {
+//        return false;
+//    }
+//    if (!FoldConstants(cx, parserAtoms, &pn, parser)) {
+//        return false;
+//    }
+extern MOZ_MUST_USE bool FoldConstants(JSContext* cx,
+                                       ParserAtomsTable& parserAtoms,
+                                       ParseNode** pnp,
+                                       FullParseHandler* handler);
+
+inline MOZ_MUST_USE bool FoldConstants(JSContext* cx,
+                                       ParserAtomsTable& parserAtoms,
+                                       typename SyntaxParseHandler::Node* pnp,
+                                       SyntaxParseHandler* handler) {
+  return true;
+}
+
+} /* namespace frontend */
+} /* namespace js */
+
+#endif /* frontend_FoldConstants_h */