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1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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56 | 56 |
57 function SymbolValueOf() { | 57 function SymbolValueOf() { |
58 if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) { | 58 if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) { |
59 throw MakeTypeError( | 59 throw MakeTypeError( |
60 'incompatible_method_receiver', ["Symbol.prototype.valueOf", this]); | 60 'incompatible_method_receiver', ["Symbol.prototype.valueOf", this]); |
61 } | 61 } |
62 return %_ValueOf(this); | 62 return %_ValueOf(this); |
63 } | 63 } |
64 | 64 |
65 | 65 |
66 function GetSymbolRegistry() { | |
67 var registry = %SymbolRegistry(); | |
68 if (!('internal' in registry)) { | |
69 registry.internal = {__proto__: null}; | |
70 registry.for = {__proto__: null}; | |
71 registry.keyFor = {__proto__: null}; | |
72 } | |
73 return registry; | |
74 } | |
75 | |
76 | |
77 function InternalSymbol(key) { | |
78 var registry = GetSymbolRegistry(); | |
79 if (!(key in registry.internal)) { | |
80 registry.internal[key] = %CreateSymbol(key); | |
81 } | |
82 return registry.internal[key]; | |
83 } | |
84 | |
85 | |
86 function SymbolFor(key) { | |
87 key = TO_STRING_INLINE(key); | |
88 var registry = GetSymbolRegistry(); | |
89 if (!(key in registry.for)) { | |
90 var symbol = %CreateSymbol(key); | |
91 registry.for[key] = symbol; | |
92 registry.keyFor[symbol] = key; | |
93 } | |
94 return registry.for[key]; | |
95 } | |
96 | |
97 | |
98 function SymbolKeyFor(symbol) { | |
99 if (!IS_SYMBOL(symbol)) { | |
100 throw MakeTypeError("not_a_symbol", [symbol]); | |
101 } | |
102 return GetSymbolRegistry().keyFor[symbol]; | |
103 } | |
104 | |
105 | |
106 // ES6 19.1.2.8 | 66 // ES6 19.1.2.8 |
107 function ObjectGetOwnPropertySymbols(obj) { | 67 function ObjectGetOwnPropertySymbols(obj) { |
108 if (!IS_SPEC_OBJECT(obj)) { | 68 if (!IS_SPEC_OBJECT(obj)) { |
109 throw MakeTypeError("called_on_non_object", | 69 throw MakeTypeError("called_on_non_object", |
110 ["Object.getOwnPropertySymbols"]); | 70 ["Object.getOwnPropertySymbols"]); |
111 } | 71 } |
112 | 72 |
113 // TODO(arv): Proxies use a shared trap for String and Symbol keys. | 73 // TODO(arv): Proxies use a shared trap for String and Symbol keys. |
114 | 74 |
115 return ObjectGetOwnPropertyKeys(obj, true); | 75 return ObjectGetOwnPropertyKeys(obj, true); |
116 } | 76 } |
117 | 77 |
118 | 78 |
119 //------------------------------------------------------------------- | 79 //------------------------------------------------------------------- |
120 | 80 |
121 var symbolCreate = InternalSymbol("@@create"); | |
122 var symbolHasInstance = InternalSymbol("@@hasInstance"); | |
123 var symbolIsConcatSpreadable = InternalSymbol("@@isConcatSpreadable"); | |
124 var symbolIsRegExp = InternalSymbol("@@isRegExp"); | |
125 var symbolIterator = InternalSymbol("@@iterator"); | |
126 var symbolToStringTag = InternalSymbol("@@toStringTag"); | |
127 var symbolUnscopables = InternalSymbol("@@unscopables"); | |
128 | |
129 | |
130 //------------------------------------------------------------------- | |
131 | |
132 function SetUpSymbol() { | 81 function SetUpSymbol() { |
133 %CheckIsBootstrapping(); | 82 %CheckIsBootstrapping(); |
134 | 83 |
135 %SetCode($Symbol, SymbolConstructor); | 84 %SetCode($Symbol, SymbolConstructor); |
136 %FunctionSetPrototype($Symbol, new $Object()); | 85 %FunctionSetPrototype($Symbol, new $Object()); |
137 | 86 |
138 %SetProperty($Symbol, "create", symbolCreate, DONT_ENUM); | |
139 %SetProperty($Symbol, "hasInstance", symbolHasInstance, DONT_ENUM); | |
140 %SetProperty($Symbol, "isConcatSpreadable", | |
141 symbolIsConcatSpreadable, DONT_ENUM); | |
142 %SetProperty($Symbol, "isRegExp", symbolIsRegExp, DONT_ENUM); | |
143 %SetProperty($Symbol, "iterator", symbolIterator, DONT_ENUM); | |
144 %SetProperty($Symbol, "toStringTag", symbolToStringTag, DONT_ENUM); | |
145 %SetProperty($Symbol, "unscopables", symbolUnscopables, DONT_ENUM); | |
146 InstallFunctions($Symbol, DONT_ENUM, $Array( | |
147 "for", SymbolFor, | |
148 "keyFor", SymbolKeyFor | |
149 )); | |
150 | |
151 %SetProperty($Symbol.prototype, "constructor", $Symbol, DONT_ENUM); | 87 %SetProperty($Symbol.prototype, "constructor", $Symbol, DONT_ENUM); |
152 InstallFunctions($Symbol.prototype, DONT_ENUM, $Array( | 88 InstallFunctions($Symbol.prototype, DONT_ENUM, $Array( |
153 "toString", SymbolToString, | 89 "toString", SymbolToString, |
154 "valueOf", SymbolValueOf | 90 "valueOf", SymbolValueOf |
155 )); | 91 )); |
156 } | 92 } |
157 | 93 |
158 SetUpSymbol(); | 94 SetUpSymbol(); |
159 | 95 |
160 | 96 |
161 function ExtendObject() { | 97 function ExtendObject() { |
162 %CheckIsBootstrapping(); | 98 %CheckIsBootstrapping(); |
163 | 99 |
164 InstallFunctions($Object, DONT_ENUM, $Array( | 100 InstallFunctions($Object, DONT_ENUM, $Array( |
165 "getOwnPropertySymbols", ObjectGetOwnPropertySymbols | 101 "getOwnPropertySymbols", ObjectGetOwnPropertySymbols |
166 )); | 102 )); |
167 } | 103 } |
168 | 104 |
169 ExtendObject(); | 105 ExtendObject(); |
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