Re: Debugging of optimized code

>: * Where am I, in the program? This is reasonably simple to
> provide - the source line has to be carried through all the
> intermediate forms in the compiler. However it can be quite a bit
> of work to ensure it is transferd through all the transformations.


The AS/400 ILE optimizing code generator is one of several systems which
simply maintain (with varying degrees of success) a list of ALL line
numbers which apply to a particular machine instruction. This is a
somewhat difficult task but not intractable if the facilities are built
into the optimizer from the start. Of course, the usefulness of such a
list varies inversely with its length, but at least the user isn't being
told that the position is unknown.


Dan Hicks


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