1// Copyright 2013 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28"use strict"; 29 30// This file relies on the fact that the following declaration has been made 31// in runtime.js: 32// var $Array = global.Array; 33 34var $Symbol = global.Symbol; 35 36// ------------------------------------------------------------------- 37 38function SymbolConstructor(x) { 39 var value = 40 IS_SYMBOL(x) ? x : %CreateSymbol(IS_UNDEFINED(x) ? x : ToString(x)); 41 if (%_IsConstructCall()) { 42 %_SetValueOf(this, value); 43 } else { 44 return value; 45 } 46} 47 48function SymbolGetName() { 49 var symbol = IS_SYMBOL_WRAPPER(this) ? %_ValueOf(this) : this; 50 if (!IS_SYMBOL(symbol)) { 51 throw MakeTypeError( 52 'incompatible_method_receiver', ["Symbol.prototype.name", this]); 53 } 54 return %SymbolName(symbol); 55} 56 57function SymbolToString() { 58 throw MakeTypeError('symbol_to_string'); 59} 60 61function SymbolValueOf() { 62 // NOTE: Both Symbol objects and values can enter here as 63 // 'this'. This is not as dictated by ECMA-262. 64 if (!IS_SYMBOL(this) && !IS_SYMBOL_WRAPPER(this)) { 65 throw MakeTypeError( 66 'incompatible_method_receiver', ["Symbol.prototype.valueOf", this]); 67 } 68 return %_ValueOf(this); 69} 70 71//------------------------------------------------------------------- 72 73function SetUpSymbol() { 74 %CheckIsBootstrapping(); 75 76 %SetCode($Symbol, SymbolConstructor); 77 %FunctionSetPrototype($Symbol, new $Symbol()); 78 %SetProperty($Symbol.prototype, "constructor", $Symbol, DONT_ENUM); 79 80 InstallGetter($Symbol.prototype, "name", SymbolGetName); 81 InstallFunctions($Symbol.prototype, DONT_ENUM, $Array( 82 "toString", SymbolToString, 83 "valueOf", SymbolValueOf 84 )); 85} 86 87SetUpSymbol(); 88