JavaScriptCore-1218.tar.gz

[apple/javascriptcore.git] / runtime / JSSegmentedVariableObject.cpp

/*
 * Copyright (C) 2012 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer. 
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
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 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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#include "config.h"
#include "JSSegmentedVariableObject.h"

#include "Operations.h"

namespace JSC {

int JSSegmentedVariableObject::findRegisterIndex(void* registerAddress)
{
    for (int i = m_registers.size(); i--;) {
        if (&m_registers[i] != registerAddress)
            continue;
        return i;
    }
    CRASH();
    return -1;
}

int JSSegmentedVariableObject::addRegisters(int numberOfRegistersToAdd)
{
    ASSERT(numberOfRegistersToAdd >= 0);
    
    size_t oldSize = m_registers.size();
    m_registers.grow(oldSize + numberOfRegistersToAdd);
    
    for (size_t i = numberOfRegistersToAdd; i--;)
        m_registers[oldSize + i].setWithoutWriteBarrier(jsUndefined());
    
    return static_cast<int>(oldSize);
}

void JSSegmentedVariableObject::visitChildren(JSCell* cell, SlotVisitor& slotVisitor)
{
    JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
    JSSymbolTableObject::visitChildren(thisObject, slotVisitor);
    
    for (unsigned i = thisObject->m_registers.size(); i--;)
        slotVisitor.append(&thisObject->m_registers[i]);
}

} // namespace JSC