lookupTypes.hpp

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/* Copyright 1994, 1995 LongView Technologies L.L.C. $Revision: 1.4 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
All rights reserved.

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#ifdef junk

enum BaseLookupType {
  NormalLookupType,  SelfLookupType, SuperLookupType
};

enum CountType {
  NonCounting,          // no counting at all
  Counting,             // incrementing a counter
  Comparing             // increment & test for reaching limit (recompilation)
};


typedef int LookupType;

const int LookupTypeSize = 2;
const int LookupTypeMask = 3;

const int CountTypeMask = NonCounting | Counting | Comparing;
const int CountTypeSize = 2;
const int CountSendBit  = LookupTypeSize + 1;

// the dirty bit records whether the inline cache has ever made a transition 
// from non-empty to empty (e.g. through flushing)
const int DirtySendBit  = CountSendBit + CountTypeSize;
const int DirtySendMask = 1 << DirtySendBit;

// the optimized bit says that if no callee nmethod exists, an optimized
// method should be created immediately rather than going through an
// unoptimized version first
const int OptimizedSendBit  = DirtySendBit + 1;
const int OptimizedSendMask = 1 << OptimizedSendBit;

// the uninlinable bit says that the SIC has decided it's not worth
// inlining this send no matter how often it is executed.
const int UninlinableSendBit  = OptimizedSendBit + 1;
const int UninlinableSendMask = 1 << UninlinableSendBit;

inline LookupType withoutExtraBits(LookupType lookupType) {
  return lookupType & LookupTypeMask;
}
inline LookupType withCountBits(LookupType l, CountType t) {
  return LookupType((int(l) & ~(CountTypeMask << CountSendBit))
                    | (t << CountSendBit));
}

inline CountType countType(LookupType l) {
  return CountType((int(l) >> CountSendBit) & CountTypeMask);
}

extern "C" {
  void printLookupType(LookupType lookupType);
  char* lookupTypeName(LookupType lookupType);
}
#endif

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