Answer the `cleanness' of the block.
0 = clean;
1 = access to receiver variables and/or self;
2-30 = access to variables that are 1-29 contexts away;
31 = return from method or push thisContext
method
Answer the CompiledMethod in which the receiver lies
methodClass
Answer the class in which the receiver is installed.
methodClass: methodClass
Set the receiver's class instance variable
numArgs
Answer the number of arguments passed to the receiver
numLiterals
Answer the number of literals for the receiver
numTemps
Answer the number of temporary variables used by the receiver
selector
Answer the selector through which the method is called
selector: aSymbol
Set the selector through which the method is called
sourceCodeLinesDelta
Answer the delta from the numbers in LINE_NUMBER bytecodes
to source code line numbers.
sourceCodeMap
Answer an array which maps bytecode indices to source code
line numbers. 0 values represent invalid instruction
pointer indices.
stackDepth
Answer the number of stack slots needed for the receiver