Method of automatically evaluating source language logic conditi

Details Method of automatically evaluating source language logic conditi Method of automatically evaluating source language logic conditi

1973-11-28

1982-01-05

Boudreau, Leo H.

Boots, shoes, and leggings

G06F 300

Patent

active

043097561

ABSTRACT:
A method for use under program control in a digital computer for automatically evaluating compiler level language logic condition sets and for compiling machine executable instructions directly therefrom is disclosed. More specifically, a unique method of constructing an array of novel logical linkages is described which permits an especially rapid direct compilation of an efficient and optimum-sized set of machine executable instructions without constructing the usual logic decision tables or going through an extra assembly level language step as is the case with most prior compilers. Rather, the method described generates an array of so-called primary link codes representing logical interrelationships or links between successive source deck cards in a condition set while also generating an associated array of so-called secondary link codes representing logical interrelationships or links between successive entries on the same source deck card in a condition set. These arrays are formed in such a manner that a simple analysis in terms of increasing/decreasing values of the primary and secondary link codes permits direct compilation of machine executable instructions from a computed array of incremental addresses for each term of the condition set. Further, the resulting set of machine instructions is near optimum in terms of both the core storage area utilized and the object program execution time.

REFERENCES:
Graham, R. M., "Bounded Context Translation," in AFIPS Conference Proceedings, vol. 25; 1964, Spring Joint Computer Conference, pp. 17-29.
Cheatham, T. E., Jr. and Sattley K., "Syntax-Directed Compiling", in AFIPS Conference Proceedings, vol. 25; 1964, Spring Joint Computer Conf., pp. 31-57.
Halpern, M. I., "XPOP: A Meta-Language Without Metaphysics" in AFIPS Conference Proceedings, vol. 26; 1964, Fall Joint Computer Conference, pp. 57-68.

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