runtime/Symbol.cpp

   1 /*
   2  * Copyright (C) 2012 Apple Inc. All rights reserved.
   3  * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  15  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  16  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  18  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  19  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  20  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  21  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  22  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  23  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  24  * THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "config.h"
  28 #include "Symbol.h"
  29
  30 #include "Error.h"
  31 #include "JSCInlines.h"
  32 #include "SymbolObject.h"
  33
  34 namespace JSC {
  35
  36 const ClassInfo Symbol::s_info = { "symbol", nullptr, nullptr, CREATE_METHOD_TABLE(Symbol) };
  37
  38 Symbol::Symbol(VM& vm)
  39     : Base(vm, vm.symbolStructure.get())
  40     , m_privateName()
  41 {
  42 }
  43
  44 Symbol::Symbol(VM& vm, const String& string)
  45     : Base(vm, vm.symbolStructure.get())
  46     , m_privateName(PrivateName::Description, string)
  47 {
  48 }
  49
  50 Symbol::Symbol(VM& vm, SymbolImpl& uid)
  51     : Base(vm, vm.symbolStructure.get())
  52     , m_privateName(uid)
  53 {
  54 }
  55
  56 inline SymbolObject* SymbolObject::create(VM& vm, JSGlobalObject* globalObject, Symbol* symbol)
  57 {
  58     SymbolObject* object = new (NotNull, allocateCell<SymbolObject>(vm.heap)) SymbolObject(vm, globalObject->symbolObjectStructure());
  59     object->finishCreation(vm, symbol);
  60     return object;
  61 }
  62
  63 JSValue Symbol::toPrimitive(ExecState*, PreferredPrimitiveType) const
  64 {
  65     return const_cast<Symbol*>(this);
  66 }
  67
  68 bool Symbol::getPrimitiveNumber(ExecState* exec, double& number, JSValue& result) const
  69 {
  70     result = this;
  71     number = toNumber(exec);
  72     return true;
  73 }
  74
  75 JSObject* Symbol::toObject(ExecState* exec, JSGlobalObject* globalObject) const
  76 {
  77     return SymbolObject::create(exec->vm(), globalObject, const_cast<Symbol*>(this));
  78 }
  79
  80 double Symbol::toNumber(ExecState* exec) const
  81 {
  82     throwTypeError(exec);
  83     return 0.0;
  84 }
  85
  86 void Symbol::destroy(JSCell* cell)
  87 {
  88     static_cast<Symbol*>(cell)->Symbol::~Symbol();
  89 }
  90
  91 String Symbol::descriptiveString() const
  92 {
  93     return makeString("Symbol(", String(privateName().uid()), ')');
  94 }
  95
  96 } // namespace JSC