runtime/JSPropertyNameEnumerator.cpp

   1 /*
   2  * Copyright (C) 2014 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JSPropertyNameEnumerator.h"
  28
  29 #include "JSCInlines.h"
  30 #include "StrongInlines.h"
  31
  32 namespace JSC {
  33
  34 const ClassInfo JSPropertyNameEnumerator::s_info = { "JSPropertyNameEnumerator", 0, 0, CREATE_METHOD_TABLE(JSPropertyNameEnumerator) };
  35
  36 JSPropertyNameEnumerator* JSPropertyNameEnumerator::create(VM& vm)
  37 {
  38     if (!vm.emptyPropertyNameEnumerator.get()) {
  39         PropertyNameArray propertyNames(&vm);
  40         vm.emptyPropertyNameEnumerator = Strong<JSCell>(vm, create(vm, 0, 0, 0, propertyNames));
  41     }
  42     return jsCast<JSPropertyNameEnumerator*>(vm.emptyPropertyNameEnumerator.get());
  43 }
  44
  45 JSPropertyNameEnumerator* JSPropertyNameEnumerator::create(VM& vm, Structure* structure, uint32_t indexedLength, uint32_t numberStructureProperties, PropertyNameArray& propertyNames)
  46 {
  47     StructureID structureID = structure ? structure->id() : 0;
  48     uint32_t inlineCapacity = structure ? structure->inlineCapacity() : 0;
  49     JSPropertyNameEnumerator* enumerator = new (NotNull,
  50         allocateCell<JSPropertyNameEnumerator>(vm.heap)) JSPropertyNameEnumerator(vm, structureID, inlineCapacity);
  51     enumerator->finishCreation(vm, indexedLength, numberStructureProperties, propertyNames.data());
  52     return enumerator;
  53 }
  54
  55 JSPropertyNameEnumerator::JSPropertyNameEnumerator(VM& vm, StructureID structureID, uint32_t inlineCapacity)
  56     : JSCell(vm, vm.propertyNameEnumeratorStructure.get())
  57     , m_cachedStructureID(structureID)
  58     , m_cachedInlineCapacity(inlineCapacity)
  59 {
  60 }
  61
  62 void JSPropertyNameEnumerator::finishCreation(VM& vm, uint32_t indexedLength, uint32_t endStructurePropertyIndex, PassRefPtr<PropertyNameArrayData> idents)
  63 {
  64     Base::finishCreation(vm);
  65
  66     RefPtr<PropertyNameArrayData> identifiers = idents;
  67     PropertyNameArrayData::PropertyNameVector& vector = identifiers->propertyNameVector();
  68
  69     m_indexedLength = indexedLength;
  70     m_endStructurePropertyIndex = endStructurePropertyIndex;
  71     m_endGenericPropertyIndex = vector.size();
  72
  73     m_propertyNames.resizeToFit(vector.size());
  74     for (unsigned i = 0; i < vector.size(); ++i) {
  75         const Identifier& identifier = vector[i];
  76         m_propertyNames[i].set(vm, this, jsString(&vm, identifier.string()));
  77     }
  78 }
  79
  80 void JSPropertyNameEnumerator::destroy(JSCell* cell)
  81 {
  82     jsCast<JSPropertyNameEnumerator*>(cell)->JSPropertyNameEnumerator::~JSPropertyNameEnumerator();
  83 }
  84
  85 void JSPropertyNameEnumerator::visitChildren(JSCell* cell, SlotVisitor& visitor)
  86 {
  87     Base::visitChildren(cell, visitor);
  88     JSPropertyNameEnumerator* thisObject = jsCast<JSPropertyNameEnumerator*>(cell);
  89     for (unsigned i = 0; i < thisObject->m_propertyNames.size(); ++i)
  90         visitor.append(&thisObject->m_propertyNames[i]);
  91     visitor.append(&thisObject->m_prototypeChain);
  92 }
  93
  94 } // namespace JSC