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       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2             :  * vim: set ts=8 sts=4 et sw=4 tw=99:
       3             :  * This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #ifndef frontend_FoldConstants_h
       8             : #define frontend_FoldConstants_h
       9             : 
      10             : #include "frontend/SyntaxParseHandler.h"
      11             : 
      12             : namespace js {
      13             : namespace frontend {
      14             : 
      15             : class FullParseHandler;
      16             : template <class ParseHandler, typename CharT> class Parser;
      17             : 
      18             : // Perform constant folding on the given AST. For example, the program
      19             : // `print(2 + 2)` would become `print(4)`.
      20             : //
      21             : // pnp is the address of a pointer variable that points to the root node of the
      22             : // AST. On success, *pnp points to the root node of the new tree, which may be
      23             : // the same node (unchanged or modified in place) or a new node.
      24             : //
      25             : // Usage:
      26             : //    pn = parser->statement();
      27             : //    if (!pn)
      28             : //        return false;
      29             : //    if (!FoldConstants(cx, &pn, parser))
      30             : //        return false;
      31             : template<typename CharT>
      32             : MOZ_MUST_USE bool
      33             : FoldConstants(JSContext* cx, ParseNode** pnp, Parser<FullParseHandler, CharT>* parser);
      34             : 
      35             : template<typename CharT>
      36             : inline MOZ_MUST_USE bool
      37           0 : FoldConstants(JSContext* cx, typename SyntaxParseHandler::Node* pnp,
      38             :               Parser<SyntaxParseHandler, CharT>* parser)
      39             : {
      40           0 :     return true;
      41             : }
      42             : 
      43             : } /* namespace frontend */
      44             : } /* namespace js */
      45             : 
      46             : #endif /* frontend_FoldConstants_h */