VMBasicConstants Heuristics Question.

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VMBasicConstants Heuristics Question.

gettimothy
Two questions if you have time.


Looking at the VMBasicsConstants, some observations.

We have UPPERCASE and CamelCase values.
We have what appear to be
Directives: GCModeFull, DoAssertionChecks, etc.
Defines:  BaseHeaderSize, ByteXMask, etc.


Question 1.
are Directives and Defines a correct categorization? and are there categorizations I am missing?
(I am sure I could intuit these with time, but knowing this ahead of time would be a time-saver)



Question 2.
I would like to verify the heuristics of
COGMTVM
COGVM
STACKVM


When I load these into the script to boot the simulator, like this:

| vm |
Transcript clear.
vm := StackInterpreterSimulator newWithOptions: #(#COGVM true)."
vm openOn: '/home/wm/usr/src/smalltalk/buildCogDevelopmentImageCog.app/Contents/Resources/Squeak4.4.image'.
vm openAsMorph; run


I am assuming that I am informing the StackInterpreterSimulator that it is executing on a COGVM image (which I am running) and that if I was
running multi-threading enabled cog, I would feed it the #COGMTVM. I am NOT telling the Interpreter that its target is an image that has been
'fingerprinted' by being run with those VM's in the past. (I have in mind the early releases of Cog where when you ran an old VM on an image, then switched to Cog it warned you that it was a one-way-street).

thanks for your time.

tty.








BaseHeaderSize
Byte0Mask
Byte0Shift
Byte1Mask
Byte1Shift
Byte1ShiftNegated
Byte2Mask
Byte2Shift
Byte3Mask
Byte3Shift
Byte3ShiftNegated
Byte4Mask
Byte4Shift
Byte4ShiftNegated
Byte5Mask
Byte5Shift
Byte5ShiftNegated
Byte6Mask
Byte6Shift
Byte7Mask
Byte7Shift
Byte7ShiftNegated
Bytes3to0Mask
Bytes7to4Mask
BytesPerOop
BytesPerWord
COGMTVM
COGVM
DisownVMLockOutFullGC
DoAssertionChecks
DoExpensiveAssertionChecks
GCModeBecome
GCModeFull
GCModeIncr
GCModeScavenge
IMMUTABILITY
MULTIPLEBYTECODESETS
NewspeakVM
PrimErrBadArgument
PrimErrBadIndex
PrimErrBadMethod
PrimErrBadNumArgs
PrimErrBadReceiver
PrimErrGenericFailure
PrimErrInappropriate
PrimErrLimitExceeded
PrimErrNamedInternal
PrimErrNoCMemory
PrimErrNoMemory
PrimErrNoModification
PrimErrNotFound
PrimErrObjectIsPinned
PrimErrObjectMayMove
PrimErrUnsupported
PrimNoErr
STACKVM
ShiftForWord
VMBIGENDIAN


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