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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 |
11 // with the distribution. | 11 // with the distribution. |
12 // * Neither the name of Google Inc. nor the names of its | 12 // * Neither the name of Google Inc. nor the names of its |
13 // contributors may be used to endorse or promote products derived | 13 // contributors may be used to endorse or promote products derived |
14 // from this software without specific prior written permission. | 14 // from this software without specific prior written permission. |
15 // | 15 // |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 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. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | 27 |
28 "use strict"; | 28 "use strict"; |
29 | 29 |
30 var $Symbol = function() { return %CreateSymbol() } | 30 var $Symbol = global.Symbol; |
31 global.Symbol = $Symbol | |
32 | 31 |
33 // Symbols only have a toString method and no prototype. | 32 function SymbolConstructor(x) { |
34 var SymbolDelegate = { | 33 var value = IS_SYMBOL(x) ? x : %CreateSymbol(); |
35 __proto__: null, | 34 if (%_IsConstructCall()) { |
36 toString: $Object.prototype.toString | 35 %_SetValueOf(this, value); |
| 36 } else { |
| 37 return value; |
| 38 } |
37 } | 39 } |
38 | 40 |
39 $Object.freeze(SymbolDelegate) | 41 function SymbolToString() { |
| 42 throw MakeTypeError('symbol_to_string'); |
| 43 } |
| 44 |
| 45 function SymbolValueOf() { |
| 46 // NOTE: Both Symbol objects and values can enter here as |
| 47 // 'this'. This is not as dictated by ECMA-262. |
| 48 if (!IS_SYMBOL(this) && !IS_SYMBOL_WRAPPER(this)) { |
| 49 throw MakeTypeError( |
| 50 'incompatible_method_receiver', ["Symbol.prototype.valueOf", this]); |
| 51 } |
| 52 return %_ValueOf(this); |
| 53 } |
| 54 |
| 55 //------------------------------------------------------------------- |
| 56 |
| 57 function SetUpSymbol() { |
| 58 %CheckIsBootstrapping(); |
| 59 |
| 60 %SetCode($Symbol, SymbolConstructor); |
| 61 %FunctionSetPrototype($Symbol, new $Symbol()); |
| 62 %SetProperty($Symbol.prototype, "constructor", $Symbol, DONT_ENUM); |
| 63 |
| 64 InstallFunctions($Symbol.prototype, DONT_ENUM, $Array( |
| 65 "toString", SymbolToString, |
| 66 "valueOf", SymbolValueOf |
| 67 )); |
| 68 } |
| 69 |
| 70 SetUpSymbol(); |
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