Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.ruby.runtime/src/com/oracle/truffle/ruby/runtime/UndefinedPlaceholder.java @ 13569:1894412de0ed
Ruby: major upgrade in debugging support, mainly for navigation: step, next (passing over calls), return (from enclosing function), etc. Also a few bug fixes.
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Wed, 08 Jan 2014 14:03:36 -0800 |
parents | 0fbee3eb71f0 |
children |
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/* * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This * code is released under a tri EPL/GPL/LGPL license. You can use it, * redistribute it and/or modify it under the terms of the: * * Eclipse Public License version 1.0 * GNU General Public License version 2 * GNU Lesser General Public License version 2.1 */ package com.oracle.truffle.ruby.runtime; /** * The {@link UndefinedPlaceholder} is a value that represents an undefined value in Ruby. This is * used to differentiate between nil and the true absence of a value, such as an argument that has * not been passed. */ public final class UndefinedPlaceholder { public static final UndefinedPlaceholder INSTANCE = new UndefinedPlaceholder(); private UndefinedPlaceholder() { } }