#ifndef DFGEdge_h
#define DFGEdge_h
#include <wtf/Platform.h>
#if ENABLE(DFG_JIT)
#include "DFGCommon.h"
namespace JSC { namespace DFG {
class AdjacencyList;
class Edge {
public:
Edge()
: m_encodedWord(makeWord(NoNode, UntypedUse))
{
}
explicit Edge(NodeIndex nodeIndex)
: m_encodedWord(makeWord(nodeIndex, UntypedUse))
{
}
Edge(NodeIndex nodeIndex, UseKind useKind)
: m_encodedWord(makeWord(nodeIndex, useKind))
{
}
NodeIndex indexUnchecked() const { return m_encodedWord >> shift(); }
NodeIndex index() const
{
ASSERT(isSet());
return m_encodedWord >> shift();
}
void setIndex(NodeIndex nodeIndex)
{
m_encodedWord = makeWord(nodeIndex, useKind());
}
UseKind useKind() const
{
ASSERT(isSet());
unsigned masked = m_encodedWord & (((1 << shift()) - 1));
ASSERT(masked < LastUseKind);
return static_cast<UseKind>(masked);
}
void setUseKind(UseKind useKind)
{
ASSERT(isSet());
m_encodedWord = makeWord(index(), useKind);
}
bool isSet() const { return indexUnchecked() != NoNode; }
bool operator!() const { return !isSet(); }
bool operator==(Edge other) const
{
return m_encodedWord == other.m_encodedWord;
}
bool operator!=(Edge other) const
{
return m_encodedWord != other.m_encodedWord;
}
private:
friend class AdjacencyList;
static uint32_t shift() { return 4; }
static int32_t makeWord(NodeIndex nodeIndex, UseKind useKind)
{
ASSERT(static_cast<uint32_t>(((static_cast<int32_t>(nodeIndex) << shift()) >> shift())) == nodeIndex);
ASSERT(useKind >= 0 && useKind < LastUseKind);
ASSERT(LastUseKind <= (1 << shift()));
return (nodeIndex << shift()) | useKind;
}
int32_t m_encodedWord;
};
inline bool operator==(Edge nodeUse, NodeIndex nodeIndex)
{
return nodeUse.indexUnchecked() == nodeIndex;
}
inline bool operator==(NodeIndex nodeIndex, Edge nodeUse)
{
return nodeUse.indexUnchecked() == nodeIndex;
}
inline bool operator!=(Edge nodeUse, NodeIndex nodeIndex)
{
return nodeUse.indexUnchecked() != nodeIndex;
}
inline bool operator!=(NodeIndex nodeIndex, Edge nodeUse)
{
return nodeUse.indexUnchecked() != nodeIndex;
}
} }
#endif // ENABLE(DFG_JIT)
#endif // DFGEdge_h