By Karel Driesen (auth.)
The implementation of object-oriented languages has been an lively subject of analysis because the Sixties while the 1st Simula compiler used to be written. the subject obtained renewed curiosity within the early Nineteen Eighties with the becoming approval for object-oriented programming languages equivalent to c++ and Smalltalk, and acquired one other develop with the appearance of Java. Polymorphic calls are on the middle of object-oriented languages, or even the 1st implementation of Simula-67 contained their vintage implementation through digital functionality tables. actually, digital functionality tables predate even Simula-for instance, Ivan Sutherland's Sketchpad drawing editor hired very comparable buildings in 1960. equally, through the Seventies and Nineteen Eighties the implementers of Smalltalk structures spent huge efforts on enforcing polymorphic demands this dynamically typed language the place digital functionality tables couldn't be used. Given this lengthy background of analysis into the implementation of polymorphic calls, and the fairly mature status it completed over the years, why, one may well ask, may still there be a brand new publication during this box? the answer's uncomplicated. either software program and have replaced significantly in recent times, to the purpose the place many assumptions underlying the unique paintings during this box aren't any longer actual. particularly, digital functionality tables aren't any longer adequate to enforce polymorphic calls even for statically typed languages; for instance, Java's interface calls can't be applied this fashion. moreover, trendy processors are deeply pipelined and will execute directions out-of order, making it tough to foretell the execution time of even easy code sequences.
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5% real overhead. Out of an array with 1388 entries, only 3 are unoccupied, and even these gaps are caused by contention over row offsets by one-entry rows, not by true fitting conflicts (remember that all rows need to have unique offsets in the compressed array). 3, we will present compression results for several other single inheritance class libraries. 4 CLASS NUMBERING FOR MULTIPLE INHERITANCE The depth-first numbering scheme can easily be applied to a multiple inheritance class library. a.
2 SAMPLES We choose sample class libraries taken from real systems for three reasons: it facilitates comparison with other methods, it eliminates the extra step of verifying whether the real world behaves the same as the artificial samples, and as an aside it gives us the opportunity to gather some statistics from programs with hundreds of classes, which is interesting in its own right. On the other hand, the data points do not cover the realm of possible class libraries as evenly as we would wish.
3). 5 PROGRAMMING ENVIRONMENT ASPECTS The choice of a dispatch technique is influenced by considerations other than space cost and execution speed (discussed in Section 5). Code organization and demands put upon the programming environment can preclude some techniques from being used. The following aspects, though non-comprehensive, give an idea of the issues involved: • Responsiveness. , immediate feedback to programming changes). Most static techniques need to recompute some data structures after a programming change.
Efficient Polymorphic Calls by Karel Driesen (auth.)