runtime/StructureChain.cpp

   1 /*
   2  * Copyright (C) 2008 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 COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "StructureChain.h"
  28
  29 #include "JSObject.h"
  30 #include "Structure.h"
  31 #include <wtf/RefPtr.h>
  32
  33 namespace JSC {
  34
  35 ClassInfo StructureChain::s_info = { "StructureChain", 0, 0, 0 };
  36
  37 StructureChain::StructureChain(JSGlobalData& globalData, Structure* structure, Structure* head)
  38     : JSCell(globalData, structure)
  39 {
  40     size_t size = 0;
  41     for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
  42         ++size;
  43
  44     m_vector = adoptArrayPtr(new WriteBarrier<Structure>[size + 1]);
  45
  46     size_t i = 0;
  47     for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
  48         m_vector[i++].set(globalData, this, current);
  49     m_vector[i].clear();
  50 }
  51
  52 StructureChain::~StructureChain()
  53 {
  54 }
  55
  56 void StructureChain::visitChildren(SlotVisitor& visitor)
  57 {
  58     ASSERT_GC_OBJECT_INHERITS(this, &s_info);
  59     ASSERT(structure()->typeInfo().overridesVisitChildren());
  60     size_t i = 0;
  61     while (m_vector[i])
  62         visitor.append(&m_vector[i++]);
  63 }
  64
  65 } // namespace JSC