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Viewing changes to src/3rdparty/webkit/JavaScriptCore/runtime/StructureChain.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Alessandro Ghersi
  • Date: 2009-11-02 18:30:08 UTC
  • mfrom: (1.2.2 upstream)
  • mto: (15.2.5 experimental)
  • mto: This revision was merged to the branch mainline in revision 88.
  • Revision ID: james.westby@ubuntu.com-20091102183008-b6a4gcs128mvfb3m
Tags: upstream-4.6.0~beta1
Import upstream version 4.6.0~beta1

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src/3rdparty/webkit/JavaScriptCore/runtime/StructureChain.cpp
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namespace JSC {
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StructureChain::StructureChain(Structure* structure)
 
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StructureChain::StructureChain(Structure* head)
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{
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    size_t size = 1;
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    Structure* tmp = structure;
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    while (!tmp->storedPrototype()->isNull()) {
 
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    size_t size = 0;
 
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    for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
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        ++size;
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        tmp = asCell(tmp->storedPrototype())->structure();
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    }
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    m_vector.set(new RefPtr<Structure>[size + 1]);
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    size_t i;
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    for (i = 0; i < size - 1; ++i) {
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        m_vector[i] = structure;
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        structure = asObject(structure->storedPrototype())->structure();
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    }
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    m_vector[i] = structure;
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    m_vector[i + 1] = 0;
 
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    size_t i = 0;
 
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    for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
 
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        m_vector[i++] = current;
 
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    m_vector[i] = 0;
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}
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bool structureChainsAreEqual(StructureChain* chainA, StructureChain* chainB)
 
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bool StructureChain::isCacheable() const
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{
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    if (!chainA || !chainB)
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        return false;
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    RefPtr<Structure>* a = chainA->head();
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    RefPtr<Structure>* b = chainB->head();
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    while (1) {
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        if (*a != *b)
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            return false;
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        if (!*a)
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            return true;
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        a++;
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        b++;
 
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    uint32_t i = 0;
 
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    while (m_vector[i]) {
 
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        // Both classes of dictionary structure may change arbitrarily so we can't cache them
 
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        if (m_vector[i]->isDictionary())
 
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            return false;
 
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        if (!m_vector[i++]->typeInfo().hasDefaultGetPropertyNames())
 
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            return false;
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    }
 
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    return true;
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}
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} // namespace JSC