_stackLimit
_stackPointer
_framePointer
_CStackPointer
_CFramePointer
_CReturnAddress
_scavengeThreshold
_freeStart
_needGCFlag
_specialObjectsOop
_primFailCode
_primTraceLogIndex
_primitiveFunctionPointer
_newMethod
_instructionPointer
_argumentCount
_nextProfileTick
_primTraceLog
