runtime/SymbolConstructor.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 "SymbolConstructor.h"
  29
  30 #include "Error.h"
  31 #include "JSCInlines.h"
  32 #include "JSGlobalObject.h"
  33 #include "Symbol.h"
  34 #include "SymbolPrototype.h"
  35 #include <wtf/text/SymbolRegistry.h>
  36
  37 namespace JSC {
  38
  39 static EncodedJSValue JSC_HOST_CALL symbolConstructorFor(ExecState*);
  40 static EncodedJSValue JSC_HOST_CALL symbolConstructorKeyFor(ExecState*);
  41
  42 }
  43
  44 #include "SymbolConstructor.lut.h"
  45
  46 namespace JSC {
  47
  48 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(SymbolConstructor);
  49
  50 const ClassInfo SymbolConstructor::s_info = { "Function", &Base::s_info, &symbolConstructorTable, CREATE_METHOD_TABLE(SymbolConstructor) };
  51
  52 /* Source for SymbolConstructor.lut.h
  53 @begin symbolConstructorTable
  54   for       symbolConstructorFor       DontEnum|Function 1
  55   keyFor    symbolConstructorKeyFor    DontEnum|Function 1
  56 @end
  57 */
  58
  59 SymbolConstructor::SymbolConstructor(VM& vm, Structure* structure)
  60     : InternalFunction(vm, structure)
  61 {
  62 }
  63
  64 #define INITIALIZE_WELL_KNOWN_SYMBOLS(name) \
  65     putDirectWithoutTransition(vm, Identifier::fromString(&vm, #name), Symbol::create(vm, static_cast<SymbolImpl&>(*vm.propertyNames->name##Symbol.impl())), DontEnum | DontDelete | ReadOnly);
  66
  67 void SymbolConstructor::finishCreation(VM& vm, SymbolPrototype* prototype)
  68 {
  69     Base::finishCreation(vm, prototype->classInfo()->className);
  70     putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, DontEnum | DontDelete | ReadOnly);
  71     putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(0), DontDelete | ReadOnly | DontEnum);
  72
  73     JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(INITIALIZE_WELL_KNOWN_SYMBOLS)
  74 }
  75
  76 bool SymbolConstructor::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot &slot)
  77 {
  78     return getStaticFunctionSlot<Base>(exec, symbolConstructorTable, jsCast<SymbolConstructor*>(object), propertyName, slot);
  79 }
  80
  81 // ------------------------------ Functions ---------------------------
  82
  83 static EncodedJSValue JSC_HOST_CALL callSymbol(ExecState* exec)
  84 {
  85     JSValue description = exec->argument(0);
  86     if (description.isUndefined())
  87         return JSValue::encode(Symbol::create(exec->vm()));
  88     return JSValue::encode(Symbol::create(exec, description.toString(exec)));
  89 }
  90
  91 ConstructType SymbolConstructor::getConstructData(JSCell*, ConstructData&)
  92 {
  93     return ConstructTypeNone;
  94 }
  95
  96 CallType SymbolConstructor::getCallData(JSCell*, CallData& callData)
  97 {
  98     callData.native.function = callSymbol;
  99     return CallTypeHost;
 100 }
 101
 102 EncodedJSValue JSC_HOST_CALL symbolConstructorFor(ExecState* exec)
 103 {
 104     JSString* stringKey = exec->argument(0).toString(exec);
 105     if (exec->hadException())
 106         return JSValue::encode(jsUndefined());
 107     String string = stringKey->value(exec);
 108     if (exec->hadException())
 109         return JSValue::encode(jsUndefined());
 110
 111     return JSValue::encode(Symbol::create(exec->vm(), exec->vm().symbolRegistry().symbolForKey(string)));
 112 }
 113
 114 EncodedJSValue JSC_HOST_CALL symbolConstructorKeyFor(ExecState* exec)
 115 {
 116     JSValue symbolValue = exec->argument(0);
 117     if (!symbolValue.isSymbol())
 118         return JSValue::encode(throwTypeError(exec));
 119
 120     SymbolImpl* uid = asSymbol(symbolValue)->privateName().uid();
 121     if (!uid->symbolRegistry())
 122         return JSValue::encode(jsUndefined());
 123
 124     ASSERT(uid->symbolRegistry() == &exec->vm().symbolRegistry());
 125     return JSValue::encode(jsString(exec, exec->vm().symbolRegistry().keyForSymbol(*uid)));
 126 }
 127
 128 } // namespace JSC