[Vm-beginners] 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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