runtime/JSSegmentedVariableObject.cpp

   1 /*
   2  * Copyright (C) 2012, 2013, 2015 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
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   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
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  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 ScopeOffset JSSegmentedVariableObject::findVariableIndex(void* variableAddress)
  37 {
  38     ConcurrentJITLocker locker(m_lock);
  39
  40     for (unsigned i = m_variables.size(); i--;) {
  41         if (&m_variables[i] != variableAddress)
  42             continue;
  43         return ScopeOffset(i);
  44     }
  45     CRASH();
  46     return ScopeOffset();
  47 }
  48
  49 ScopeOffset JSSegmentedVariableObject::addVariables(unsigned numberOfVariablesToAdd)
  50 {
  51     ConcurrentJITLocker locker(m_lock);
  52
  53     size_t oldSize = m_variables.size();
  54     m_variables.grow(oldSize + numberOfVariablesToAdd);
  55
  56     for (size_t i = numberOfVariablesToAdd; i--;)
  57         m_variables[oldSize + i].setWithoutWriteBarrier(jsUndefined());
  58
  59     return ScopeOffset(oldSize);
  60 }
  61
  62 void JSSegmentedVariableObject::visitChildren(JSCell* cell, SlotVisitor& slotVisitor)
  63 {
  64     JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
  65     ASSERT_GC_OBJECT_INHERITS(thisObject, info());
  66     JSSymbolTableObject::visitChildren(thisObject, slotVisitor);
  67
  68     for (unsigned i = thisObject->m_variables.size(); i--;)
  69         slotVisitor.append(&thisObject->m_variables[i]);
  70 }
  71
  72 } // namespace JSC
  73