Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 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: |
| 9 | // var $Array = global.Array; |
| 10 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 11 | // And requires following symbols to be set in the bootstrapper during genesis: |
| 12 | // - symbolHasInstance |
| 13 | // - symbolIsConcatSpreadable |
| 14 | // - symbolIsRegExp |
| 15 | // - symbolIterator |
| 16 | // - symbolToStringTag |
| 17 | // - symbolUnscopables |
| 18 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 19 | var $Symbol = global.Symbol; |
| 20 | |
| 21 | // ------------------------------------------------------------------- |
| 22 | |
| 23 | function SymbolConstructor(x) { |
| 24 | if (%_IsConstructCall()) { |
| 25 | throw MakeTypeError('not_constructor', ["Symbol"]); |
| 26 | } |
| 27 | // NOTE: Passing in a Symbol value will throw on ToString(). |
| 28 | return %CreateSymbol(IS_UNDEFINED(x) ? x : ToString(x)); |
| 29 | } |
| 30 | |
| 31 | |
| 32 | function SymbolToString() { |
| 33 | if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) { |
| 34 | throw MakeTypeError( |
| 35 | 'incompatible_method_receiver', ["Symbol.prototype.toString", this]); |
| 36 | } |
| 37 | var description = %SymbolDescription(%_ValueOf(this)); |
| 38 | return "Symbol(" + (IS_UNDEFINED(description) ? "" : description) + ")"; |
| 39 | } |
| 40 | |
| 41 | |
| 42 | function SymbolValueOf() { |
| 43 | if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) { |
| 44 | throw MakeTypeError( |
| 45 | 'incompatible_method_receiver', ["Symbol.prototype.valueOf", this]); |
| 46 | } |
| 47 | return %_ValueOf(this); |
| 48 | } |
| 49 | |
| 50 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 51 | function SymbolFor(key) { |
| 52 | key = TO_STRING_INLINE(key); |
| 53 | var registry = %SymbolRegistry(); |
| 54 | if (IS_UNDEFINED(registry.for[key])) { |
| 55 | var symbol = %CreateSymbol(key); |
| 56 | registry.for[key] = symbol; |
| 57 | registry.keyFor[symbol] = key; |
| 58 | } |
| 59 | return registry.for[key]; |
| 60 | } |
| 61 | |
| 62 | |
| 63 | function SymbolKeyFor(symbol) { |
| 64 | if (!IS_SYMBOL(symbol)) throw MakeTypeError("not_a_symbol", [symbol]); |
| 65 | return %SymbolRegistry().keyFor[symbol]; |
| 66 | } |
| 67 | |
| 68 | |
| 69 | // ES6 19.1.2.8 |
| 70 | function ObjectGetOwnPropertySymbols(obj) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 71 | obj = ToObject(obj); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 72 | |
| 73 | // TODO(arv): Proxies use a shared trap for String and Symbol keys. |
| 74 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 75 | return ObjectGetOwnPropertyKeys(obj, PROPERTY_ATTRIBUTES_STRING); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 76 | } |
| 77 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 78 | //------------------------------------------------------------------- |
| 79 | |
| 80 | function SetUpSymbol() { |
| 81 | %CheckIsBootstrapping(); |
| 82 | |
| 83 | %SetCode($Symbol, SymbolConstructor); |
| 84 | %FunctionSetPrototype($Symbol, new $Object()); |
| 85 | |
| 86 | InstallConstants($Symbol, $Array( |
| 87 | // TODO(rossberg): expose when implemented. |
| 88 | // "hasInstance", symbolHasInstance, |
| 89 | // "isConcatSpreadable", symbolIsConcatSpreadable, |
| 90 | // "isRegExp", symbolIsRegExp, |
| 91 | "iterator", symbolIterator, |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 92 | // TODO(dslomov, caitp): Currently defined in harmony-tostring.js --- |
| 93 | // Move here when shipping |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 94 | // "toStringTag", symbolToStringTag, |
| 95 | "unscopables", symbolUnscopables |
| 96 | )); |
| 97 | InstallFunctions($Symbol, DONT_ENUM, $Array( |
| 98 | "for", SymbolFor, |
| 99 | "keyFor", SymbolKeyFor |
| 100 | )); |
| 101 | |
| 102 | %AddNamedProperty($Symbol.prototype, "constructor", $Symbol, DONT_ENUM); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 103 | %AddNamedProperty( |
| 104 | $Symbol.prototype, symbolToStringTag, "Symbol", DONT_ENUM | READ_ONLY); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 105 | InstallFunctions($Symbol.prototype, DONT_ENUM, $Array( |
| 106 | "toString", SymbolToString, |
| 107 | "valueOf", SymbolValueOf |
| 108 | )); |
| 109 | } |
| 110 | |
| 111 | SetUpSymbol(); |
| 112 | |
| 113 | |
| 114 | function ExtendObject() { |
| 115 | %CheckIsBootstrapping(); |
| 116 | |
| 117 | InstallFunctions($Object, DONT_ENUM, $Array( |
| 118 | "getOwnPropertySymbols", ObjectGetOwnPropertySymbols |
| 119 | )); |
| 120 | } |
| 121 | |
| 122 | ExtendObject(); |