| /* | |
| * Copyright (C) 2017 Apple Inc. All rights reserved. | |
| * | |
| * Redistribution and use in source and binary forms, with or without | |
| * modification, are permitted provided that the following conditions | |
| * are met: | |
| * 1. Redistributions of source code must retain the above copyright | |
| * notice, this list of conditions and the following disclaimer. | |
| * 2. Redistributions in binary form must reproduce the above copyright | |
| * notice, this list of conditions and the following disclaimer in the | |
| * documentation and/or other materials provided with the distribution. | |
| * | |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| */ | |
| "use strict"; | |
| // NOTE: This doesn't let you negate constexpr variables. I think that's probably OK for now, but we should | |
| // fix that eventually. | |
| // https://bugs.webkit.org/show_bug.cgi?id=177121 | |
| class ConstexprFolder extends Visitor { | |
| visitCallExpression(node) | |
| { | |
| super.visitCallExpression(node); | |
| if (node.name == "operator-" | |
| && !node.typeArguments.length | |
| && node.argumentList.length == 1 | |
| && node.argumentList[0].unifyNode.isConstexpr | |
| && node.argumentList[0].unifyNode.negConstexpr) { | |
| node.become(node.argumentList[0].unifyNode.negConstexpr(node.origin)); | |
| return; | |
| } | |
| } | |
| visitTypeOrVariableRef(node) | |
| { | |
| } | |
| } | |