| /* |
| * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>. |
| * |
| * 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. AND ITS CONTRIBUTORS ``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 ITS 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. |
| */ |
| |
| #ifndef GeneratorThisMode_h |
| #define GeneratorThisMode_h |
| |
| namespace JSC { |
| |
| // http://ecma-international.org/ecma-262/6.0/#sec-functionallocate |
| // http://ecma-international.org/ecma-262/6.0/#sec-ecmascript-function-objects-construct-argumentslist-newtarget |
| // When the function is a GeneratorFunction, its [[ConstructorKind]] is always "derived". |
| // This means that OrdinaryCallBindThis in section 9.2.2 is never executed for GeneratorFunction. |
| // So, when we execute the following, |
| // |
| // function *gen() |
| // { |
| // yield this |
| // } |
| // |
| // { |
| // let g = gen(); |
| // // |this| should be global. |
| // g.next(); |
| // } |
| // |
| // { |
| // let g = new gen(); |
| // // |this| in gen should be TDZ (and it won't be filled). |
| // g.next(); |
| // } |
| // |
| // The following flag manages this state. When GeneratorFunction is called as a constructor, it returns a Generator that function has GeneratorThisMode::Empty flag. |
| // In this case, when accessing |this|, a TDZ reference error occurs. |
| enum class GeneratorThisMode : unsigned { |
| Empty, |
| NonEmpty |
| }; |
| |
| } |
| |
| #endif // GeneratorThisMode_h |
