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| 1 // Copyright 2013 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 'use strict'; |
| 6 |
| 7 // This file relies on the fact that the following declaration has been made |
| 8 // in runtime.js and symbol.js: |
| 9 // var $Object = global.Object; |
| 10 // var $Symbol = global.Symbol; |
| 11 |
| 12 var symbolToStringTag = InternalSymbol("Symbol.toStringTag"); |
| 13 |
| 14 var kBuiltinStringTags = { |
| 15 "__proto__": null, |
| 16 "Arguments": true, |
| 17 "Array": true, |
| 18 "Boolean": true, |
| 19 "Date": true, |
| 20 "Error": true, |
| 21 "Function": true, |
| 22 "Number": true, |
| 23 "RegExp": true, |
| 24 "String": true |
| 25 }; |
| 26 |
| 27 DefaultObjectToString = ObjectToStringHarmony; |
| 28 // ES6 draft 08-24-14, section 19.1.3.6 |
| 29 function ObjectToStringHarmony() { |
| 30 if (IS_UNDEFINED(this) && !IS_UNDETECTABLE(this)) return "[object Undefined]"; |
| 31 if (IS_NULL(this)) return "[object Null]"; |
| 32 var O = ToObject(this); |
| 33 var builtinTag = %_ClassOf(O); |
| 34 var tag = O[symbolToStringTag]; |
| 35 if (IS_UNDEFINED(tag)) { |
| 36 tag = builtinTag; |
| 37 } else if (!IS_STRING(tag)) { |
| 38 return "[object ???]" |
| 39 } else if (tag !== builtinTag && kBuiltinStringTags[tag]) { |
| 40 return "[object ~" + tag + "]"; |
| 41 } |
| 42 return "[object " + tag + "]"; |
| 43 } |
| 44 |
| 45 function HarmonyToStringExtendSymbolPrototype() { |
| 46 %CheckIsBootstrapping(); |
| 47 |
| 48 InstallConstants($Symbol, $Array( |
| 49 // TODO(dslomov, caitp): Move to symbol.js when shipping |
| 50 "toStringTag", symbolToStringTag |
| 51 )); |
| 52 } |
| 53 |
| 54 HarmonyToStringExtendSymbolPrototype(); |
| 55 |
| 56 function HarmonyToStringExtendObjectPrototype() { |
| 57 %CheckIsBootstrapping(); |
| 58 |
| 59 // Set up the non-enumerable functions on the Array prototype object. |
| 60 var desc = ToPropertyDescriptor({ |
| 61 value: ObjectToStringHarmony |
| 62 }); |
| 63 DefineOwnProperty($Object.prototype, "toString", desc, false); |
| 64 } |
| 65 |
| 66 HarmonyToStringExtendObjectPrototype(); |
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