StructureTransitionTable.h [plain text]
#ifndef StructureTransitionTable_h
#define StructureTransitionTable_h
#include "UString.h"
#include <wtf/HashFunctions.h>
#include <wtf/HashMap.h>
#include <wtf/HashTraits.h>
#include <wtf/OwnPtr.h>
#include <wtf/RefPtr.h>
namespace JSC {
class Structure;
struct StructureTransitionTableHash {
typedef std::pair<RefPtr<UString::Rep>, unsigned> Key;
static unsigned hash(const Key& p)
{
return p.first->existingHash();
}
static bool equal(const Key& a, const Key& b)
{
return a == b;
}
static const bool safeToCompareToEmptyOrDeleted = true;
};
struct StructureTransitionTableHashTraits {
typedef WTF::HashTraits<RefPtr<UString::Rep> > FirstTraits;
typedef WTF::GenericHashTraits<unsigned> SecondTraits;
typedef std::pair<FirstTraits::TraitType, SecondTraits::TraitType > TraitType;
static const bool emptyValueIsZero = FirstTraits::emptyValueIsZero && SecondTraits::emptyValueIsZero;
static TraitType emptyValue() { return std::make_pair(FirstTraits::emptyValue(), SecondTraits::emptyValue()); }
static const bool needsDestruction = FirstTraits::needsDestruction || SecondTraits::needsDestruction;
static void constructDeletedValue(TraitType& slot) { FirstTraits::constructDeletedValue(slot.first); }
static bool isDeletedValue(const TraitType& value) { return FirstTraits::isDeletedValue(value.first); }
};
}
#endif // StructureTransitionTable_h