runtime/JSSegmentedVariableObject.cpp

   1 /*
   2  * Copyright (C) 2012, 2013 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 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 "JSCInlines.h"
  33
  34 namespace JSC {
  35
  36 int JSSegmentedVariableObject::findRegisterIndex(void* registerAddress)
  37 {
  38     ConcurrentJITLocker locker(m_lock);
  39
  40     for (int i = m_registers.size(); i--;) {
  41         if (&m_registers[i] != registerAddress)
  42             continue;
  43         return i;
  44     }
  45     CRASH();
  46     return -1;
  47 }
  48
  49 int JSSegmentedVariableObject::addRegisters(int numberOfRegistersToAdd)
  50 {
  51     ConcurrentJITLocker locker(m_lock);
  52
  53     ASSERT(numberOfRegistersToAdd >= 0);
  54
  55     size_t oldSize = m_registers.size();
  56     m_registers.grow(oldSize + numberOfRegistersToAdd);
  57
  58     for (size_t i = numberOfRegistersToAdd; i--;)
  59         m_registers[oldSize + i].setWithoutWriteBarrier(jsUndefined());
  60
  61     return static_cast<int>(oldSize);
  62 }
  63
  64 void JSSegmentedVariableObject::visitChildren(JSCell* cell, SlotVisitor& slotVisitor)
  65 {
  66     JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
  67     ASSERT_GC_OBJECT_INHERITS(thisObject, info());
  68     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
  69     ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
  70     JSSymbolTableObject::visitChildren(thisObject, slotVisitor);
  71
  72     for (unsigned i = thisObject->m_registers.size(); i--;)
  73         slotVisitor.append(&thisObject->m_registers[i]);
  74 }
  75
  76 } // namespace JSC
  77