Based Program-Design Environments: The
نویسندگان
چکیده
The Ergo Attribute System was designed to satisfy the requirements for attributes in a languagegeneric program derivation environment. It consists of three components: (1) an abstract data type of attributes that guarantees attribute consistency, (2) a Common Lisp implementation which combines demand-driven and incremental attribute evaluation in a novel way while allowing for attribute persistence over many generations of a program, and (3) an attribute-grammar compiler producing code based on this abstract data type from a high-level speci cation. Our experience with three major applications (one being the attribute-grammar compiler itself) con rms that the overhead in storing and accessing attributes incurred by our implementation scheme is more than o set by the gains from the demand-driven, incremental, and persistent nature of attribution. This research was supported in part by the O ce of Naval Research under contract N00014-84-K-0415 and in part by the Defense Advanced Research Projects Agency (DOD), ARPA Order No. 5404, monitored by the O ce of Naval Research under the same contract. The authors can be reached via electronic mail on the ArpaNet as [email protected] and [email protected]. To appear at the Third ACM SIGSOFT Symposium on Software Development Environments, Boston, MA, November 28-30, 1988.
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