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