runtime/JSSegmentedVariableObject.cpp

   1 /*
   2  * Copyright (C) 2012 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  *
   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  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "config.h"
  30 #include "JSSegmentedVariableObject.h"
  31
  32 #include "Operations.h"
  33
  34 namespace JSC {
  35
  36 int JSSegmentedVariableObject::findRegisterIndex(void* registerAddress)
  37 {
  38     for (int i = m_registers.size(); i--;) {
  39         if (&m_registers[i] != registerAddress)
  40             continue;
  41         return i;
  42     }
  43     CRASH();
  44     return -1;
  45 }
  46
  47 int JSSegmentedVariableObject::addRegisters(int numberOfRegistersToAdd)
  48 {
  49     ASSERT(numberOfRegistersToAdd >= 0);
  50
  51     size_t oldSize = m_registers.size();
  52     m_registers.grow(oldSize + numberOfRegistersToAdd);
  53
  54     for (size_t i = numberOfRegistersToAdd; i--;)
  55         m_registers[oldSize + i].setWithoutWriteBarrier(jsUndefined());
  56
  57     return static_cast<int>(oldSize);
  58 }
  59
  60 void JSSegmentedVariableObject::visitChildren(JSCell* cell, SlotVisitor& slotVisitor)
  61 {
  62     JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
  63     ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
  64     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
  65     ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
  66     JSSymbolTableObject::visitChildren(thisObject, slotVisitor);
  67
  68     for (unsigned i = thisObject->m_registers.size(); i--;)
  69         slotVisitor.append(&thisObject->m_registers[i]);
  70 }
  71
  72 } // namespace JSC
  73