Partial evaluation and automatic program generation by Neil D. Jones

By Neil D. Jones

The publication Partial review and automated software iteration supplies a entire presentation of partial assessment: idea, strategies, and functions. it's compatible for self-study, and for graduate classes and complex undergraduate classes on software transformation thoughts.

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HVari; hBasicBlocki+ hBasicBlocki ::= hLabeli: hAssignmenti hJumpi hAssignmenti ::= hVari := hExpri; hJumpi ::= goto hLabeli; j if hExpri goto hLabeli else hLabeli; j return hExpri; hExpri ::= hConstanti j hOpi hExpri . . 3 implements only integer constants. The values of the variables mentioned in the initial read statement are supplied by the input. The values of all other numeric variables are initially zero. Example A program to compute the greatest common divisor of natural numbers x and y: read x, y; 1: if x = y 2: if x y 3: x := x goto 1 5: y := y goto 1 7: return x goto 7 else 2 goto 5 else 3 y x Operational semantics As for the previous two languages we give the semantics for ow chart programs operationally by an interpreter written in ML.

Dn =  tp d1; . . ; dn where is a factor depending only on the program p being interpreted. Interpretation overhead Such overhead is typical for a wide range of interpreters. We shall see below that for eval above the factor is between 3 and 5, which thus is the overhead for the `interpretation loop' in eval. For realistic interpreters the interpretation overhead can be substantially larger factors from 3 to 200 have been reported in the literature, depending on the language being implemented.

Car v 'Int cadr v if equal? car v 'Add + neval cadr v neval caddr v if equal? car v 'Mul * neval cadr v neval caddr v error  In practice the tags on numbers are usually left out, writing 5 instead of Int 5. Then pattern matching exploits the fact that there is a predicate number? in Scheme which distinguishes numbers from all other values. Similarly, a source program variable x is usually represented just as the Scheme atom x instead of Var x, say. Then pattern matching exploits the Scheme predicate atom?.

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